Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
8f18cf13 | 19 | #include <linux/kernel.h> |
065631f6 | 20 | #include <linux/bio.h> |
39279cc3 | 21 | #include <linux/buffer_head.h> |
f2eb0a24 | 22 | #include <linux/file.h> |
39279cc3 CM |
23 | #include <linux/fs.h> |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
39279cc3 CM |
29 | #include <linux/backing-dev.h> |
30 | #include <linux/mpage.h> | |
31 | #include <linux/swap.h> | |
32 | #include <linux/writeback.h> | |
33 | #include <linux/statfs.h> | |
34 | #include <linux/compat.h> | |
9ebefb18 | 35 | #include <linux/bit_spinlock.h> |
5103e947 | 36 | #include <linux/xattr.h> |
33268eaf | 37 | #include <linux/posix_acl.h> |
d899e052 | 38 | #include <linux/falloc.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
4b4e25f2 | 40 | #include "compat.h" |
39279cc3 CM |
41 | #include "ctree.h" |
42 | #include "disk-io.h" | |
43 | #include "transaction.h" | |
44 | #include "btrfs_inode.h" | |
45 | #include "ioctl.h" | |
46 | #include "print-tree.h" | |
0b86a832 | 47 | #include "volumes.h" |
e6dcd2dc | 48 | #include "ordered-data.h" |
95819c05 | 49 | #include "xattr.h" |
e02119d5 | 50 | #include "tree-log.h" |
c8b97818 | 51 | #include "compression.h" |
b4ce94de | 52 | #include "locking.h" |
39279cc3 CM |
53 | |
54 | struct btrfs_iget_args { | |
55 | u64 ino; | |
56 | struct btrfs_root *root; | |
57 | }; | |
58 | ||
6e1d5dcc AD |
59 | static const struct inode_operations btrfs_dir_inode_operations; |
60 | static const struct inode_operations btrfs_symlink_inode_operations; | |
61 | static const struct inode_operations btrfs_dir_ro_inode_operations; | |
62 | static const struct inode_operations btrfs_special_inode_operations; | |
63 | static const struct inode_operations btrfs_file_inode_operations; | |
7f09410b AD |
64 | static const struct address_space_operations btrfs_aops; |
65 | static const struct address_space_operations btrfs_symlink_aops; | |
828c0950 | 66 | static const struct file_operations btrfs_dir_file_operations; |
d1310b2e | 67 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
68 | |
69 | static struct kmem_cache *btrfs_inode_cachep; | |
70 | struct kmem_cache *btrfs_trans_handle_cachep; | |
71 | struct kmem_cache *btrfs_transaction_cachep; | |
39279cc3 CM |
72 | struct kmem_cache *btrfs_path_cachep; |
73 | ||
74 | #define S_SHIFT 12 | |
75 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
76 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
77 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
78 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
79 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
80 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
81 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
82 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
83 | }; | |
84 | ||
7b128766 | 85 | static void btrfs_truncate(struct inode *inode); |
c8b97818 | 86 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end); |
771ed689 CM |
87 | static noinline int cow_file_range(struct inode *inode, |
88 | struct page *locked_page, | |
89 | u64 start, u64 end, int *page_started, | |
90 | unsigned long *nr_written, int unlock); | |
7b128766 | 91 | |
f34f57a3 YZ |
92 | static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, |
93 | struct inode *inode, struct inode *dir) | |
0279b4cd JO |
94 | { |
95 | int err; | |
96 | ||
f34f57a3 | 97 | err = btrfs_init_acl(trans, inode, dir); |
0279b4cd | 98 | if (!err) |
f34f57a3 | 99 | err = btrfs_xattr_security_init(trans, inode, dir); |
0279b4cd JO |
100 | return err; |
101 | } | |
102 | ||
c8b97818 CM |
103 | /* |
104 | * this does all the hard work for inserting an inline extent into | |
105 | * the btree. The caller should have done a btrfs_drop_extents so that | |
106 | * no overlapping inline items exist in the btree | |
107 | */ | |
d397712b | 108 | static noinline int insert_inline_extent(struct btrfs_trans_handle *trans, |
c8b97818 CM |
109 | struct btrfs_root *root, struct inode *inode, |
110 | u64 start, size_t size, size_t compressed_size, | |
111 | struct page **compressed_pages) | |
112 | { | |
113 | struct btrfs_key key; | |
114 | struct btrfs_path *path; | |
115 | struct extent_buffer *leaf; | |
116 | struct page *page = NULL; | |
117 | char *kaddr; | |
118 | unsigned long ptr; | |
119 | struct btrfs_file_extent_item *ei; | |
120 | int err = 0; | |
121 | int ret; | |
122 | size_t cur_size = size; | |
123 | size_t datasize; | |
124 | unsigned long offset; | |
261507a0 | 125 | int compress_type = BTRFS_COMPRESS_NONE; |
c8b97818 CM |
126 | |
127 | if (compressed_size && compressed_pages) { | |
261507a0 | 128 | compress_type = root->fs_info->compress_type; |
c8b97818 CM |
129 | cur_size = compressed_size; |
130 | } | |
131 | ||
d397712b CM |
132 | path = btrfs_alloc_path(); |
133 | if (!path) | |
c8b97818 CM |
134 | return -ENOMEM; |
135 | ||
b9473439 | 136 | path->leave_spinning = 1; |
c8b97818 CM |
137 | btrfs_set_trans_block_group(trans, inode); |
138 | ||
139 | key.objectid = inode->i_ino; | |
140 | key.offset = start; | |
141 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
c8b97818 CM |
142 | datasize = btrfs_file_extent_calc_inline_size(cur_size); |
143 | ||
144 | inode_add_bytes(inode, size); | |
145 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
146 | datasize); | |
147 | BUG_ON(ret); | |
148 | if (ret) { | |
149 | err = ret; | |
c8b97818 CM |
150 | goto fail; |
151 | } | |
152 | leaf = path->nodes[0]; | |
153 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
154 | struct btrfs_file_extent_item); | |
155 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
156 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
157 | btrfs_set_file_extent_encryption(leaf, ei, 0); | |
158 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
159 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); | |
160 | ptr = btrfs_file_extent_inline_start(ei); | |
161 | ||
261507a0 | 162 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 CM |
163 | struct page *cpage; |
164 | int i = 0; | |
d397712b | 165 | while (compressed_size > 0) { |
c8b97818 | 166 | cpage = compressed_pages[i]; |
5b050f04 | 167 | cur_size = min_t(unsigned long, compressed_size, |
c8b97818 CM |
168 | PAGE_CACHE_SIZE); |
169 | ||
b9473439 | 170 | kaddr = kmap_atomic(cpage, KM_USER0); |
c8b97818 | 171 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
b9473439 | 172 | kunmap_atomic(kaddr, KM_USER0); |
c8b97818 CM |
173 | |
174 | i++; | |
175 | ptr += cur_size; | |
176 | compressed_size -= cur_size; | |
177 | } | |
178 | btrfs_set_file_extent_compression(leaf, ei, | |
261507a0 | 179 | compress_type); |
c8b97818 CM |
180 | } else { |
181 | page = find_get_page(inode->i_mapping, | |
182 | start >> PAGE_CACHE_SHIFT); | |
183 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
184 | kaddr = kmap_atomic(page, KM_USER0); | |
185 | offset = start & (PAGE_CACHE_SIZE - 1); | |
186 | write_extent_buffer(leaf, kaddr + offset, ptr, size); | |
187 | kunmap_atomic(kaddr, KM_USER0); | |
188 | page_cache_release(page); | |
189 | } | |
190 | btrfs_mark_buffer_dirty(leaf); | |
191 | btrfs_free_path(path); | |
192 | ||
c2167754 YZ |
193 | /* |
194 | * we're an inline extent, so nobody can | |
195 | * extend the file past i_size without locking | |
196 | * a page we already have locked. | |
197 | * | |
198 | * We must do any isize and inode updates | |
199 | * before we unlock the pages. Otherwise we | |
200 | * could end up racing with unlink. | |
201 | */ | |
c8b97818 CM |
202 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
203 | btrfs_update_inode(trans, root, inode); | |
c2167754 | 204 | |
c8b97818 CM |
205 | return 0; |
206 | fail: | |
207 | btrfs_free_path(path); | |
208 | return err; | |
209 | } | |
210 | ||
211 | ||
212 | /* | |
213 | * conditionally insert an inline extent into the file. This | |
214 | * does the checks required to make sure the data is small enough | |
215 | * to fit as an inline extent. | |
216 | */ | |
7f366cfe | 217 | static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans, |
c8b97818 CM |
218 | struct btrfs_root *root, |
219 | struct inode *inode, u64 start, u64 end, | |
220 | size_t compressed_size, | |
221 | struct page **compressed_pages) | |
222 | { | |
223 | u64 isize = i_size_read(inode); | |
224 | u64 actual_end = min(end + 1, isize); | |
225 | u64 inline_len = actual_end - start; | |
226 | u64 aligned_end = (end + root->sectorsize - 1) & | |
227 | ~((u64)root->sectorsize - 1); | |
228 | u64 hint_byte; | |
229 | u64 data_len = inline_len; | |
230 | int ret; | |
231 | ||
232 | if (compressed_size) | |
233 | data_len = compressed_size; | |
234 | ||
235 | if (start > 0 || | |
70b99e69 | 236 | actual_end >= PAGE_CACHE_SIZE || |
c8b97818 CM |
237 | data_len >= BTRFS_MAX_INLINE_DATA_SIZE(root) || |
238 | (!compressed_size && | |
239 | (actual_end & (root->sectorsize - 1)) == 0) || | |
240 | end + 1 < isize || | |
241 | data_len > root->fs_info->max_inline) { | |
242 | return 1; | |
243 | } | |
244 | ||
920bbbfb | 245 | ret = btrfs_drop_extents(trans, inode, start, aligned_end, |
a1ed835e | 246 | &hint_byte, 1); |
c8b97818 CM |
247 | BUG_ON(ret); |
248 | ||
249 | if (isize > actual_end) | |
250 | inline_len = min_t(u64, isize, actual_end); | |
251 | ret = insert_inline_extent(trans, root, inode, start, | |
252 | inline_len, compressed_size, | |
253 | compressed_pages); | |
254 | BUG_ON(ret); | |
0ca1f7ce | 255 | btrfs_delalloc_release_metadata(inode, end + 1 - start); |
a1ed835e | 256 | btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0); |
c8b97818 CM |
257 | return 0; |
258 | } | |
259 | ||
771ed689 CM |
260 | struct async_extent { |
261 | u64 start; | |
262 | u64 ram_size; | |
263 | u64 compressed_size; | |
264 | struct page **pages; | |
265 | unsigned long nr_pages; | |
261507a0 | 266 | int compress_type; |
771ed689 CM |
267 | struct list_head list; |
268 | }; | |
269 | ||
270 | struct async_cow { | |
271 | struct inode *inode; | |
272 | struct btrfs_root *root; | |
273 | struct page *locked_page; | |
274 | u64 start; | |
275 | u64 end; | |
276 | struct list_head extents; | |
277 | struct btrfs_work work; | |
278 | }; | |
279 | ||
280 | static noinline int add_async_extent(struct async_cow *cow, | |
281 | u64 start, u64 ram_size, | |
282 | u64 compressed_size, | |
283 | struct page **pages, | |
261507a0 LZ |
284 | unsigned long nr_pages, |
285 | int compress_type) | |
771ed689 CM |
286 | { |
287 | struct async_extent *async_extent; | |
288 | ||
289 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); | |
290 | async_extent->start = start; | |
291 | async_extent->ram_size = ram_size; | |
292 | async_extent->compressed_size = compressed_size; | |
293 | async_extent->pages = pages; | |
294 | async_extent->nr_pages = nr_pages; | |
261507a0 | 295 | async_extent->compress_type = compress_type; |
771ed689 CM |
296 | list_add_tail(&async_extent->list, &cow->extents); |
297 | return 0; | |
298 | } | |
299 | ||
d352ac68 | 300 | /* |
771ed689 CM |
301 | * we create compressed extents in two phases. The first |
302 | * phase compresses a range of pages that have already been | |
303 | * locked (both pages and state bits are locked). | |
c8b97818 | 304 | * |
771ed689 CM |
305 | * This is done inside an ordered work queue, and the compression |
306 | * is spread across many cpus. The actual IO submission is step | |
307 | * two, and the ordered work queue takes care of making sure that | |
308 | * happens in the same order things were put onto the queue by | |
309 | * writepages and friends. | |
c8b97818 | 310 | * |
771ed689 CM |
311 | * If this code finds it can't get good compression, it puts an |
312 | * entry onto the work queue to write the uncompressed bytes. This | |
313 | * makes sure that both compressed inodes and uncompressed inodes | |
314 | * are written in the same order that pdflush sent them down. | |
d352ac68 | 315 | */ |
771ed689 CM |
316 | static noinline int compress_file_range(struct inode *inode, |
317 | struct page *locked_page, | |
318 | u64 start, u64 end, | |
319 | struct async_cow *async_cow, | |
320 | int *num_added) | |
b888db2b CM |
321 | { |
322 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
323 | struct btrfs_trans_handle *trans; | |
db94535d | 324 | u64 num_bytes; |
db94535d | 325 | u64 blocksize = root->sectorsize; |
c8b97818 | 326 | u64 actual_end; |
42dc7bab | 327 | u64 isize = i_size_read(inode); |
e6dcd2dc | 328 | int ret = 0; |
c8b97818 CM |
329 | struct page **pages = NULL; |
330 | unsigned long nr_pages; | |
331 | unsigned long nr_pages_ret = 0; | |
332 | unsigned long total_compressed = 0; | |
333 | unsigned long total_in = 0; | |
334 | unsigned long max_compressed = 128 * 1024; | |
771ed689 | 335 | unsigned long max_uncompressed = 128 * 1024; |
c8b97818 CM |
336 | int i; |
337 | int will_compress; | |
261507a0 | 338 | int compress_type = root->fs_info->compress_type; |
b888db2b | 339 | |
42dc7bab | 340 | actual_end = min_t(u64, isize, end + 1); |
c8b97818 CM |
341 | again: |
342 | will_compress = 0; | |
343 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; | |
344 | nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE); | |
be20aa9d | 345 | |
f03d9301 CM |
346 | /* |
347 | * we don't want to send crud past the end of i_size through | |
348 | * compression, that's just a waste of CPU time. So, if the | |
349 | * end of the file is before the start of our current | |
350 | * requested range of bytes, we bail out to the uncompressed | |
351 | * cleanup code that can deal with all of this. | |
352 | * | |
353 | * It isn't really the fastest way to fix things, but this is a | |
354 | * very uncommon corner. | |
355 | */ | |
356 | if (actual_end <= start) | |
357 | goto cleanup_and_bail_uncompressed; | |
358 | ||
c8b97818 CM |
359 | total_compressed = actual_end - start; |
360 | ||
361 | /* we want to make sure that amount of ram required to uncompress | |
362 | * an extent is reasonable, so we limit the total size in ram | |
771ed689 CM |
363 | * of a compressed extent to 128k. This is a crucial number |
364 | * because it also controls how easily we can spread reads across | |
365 | * cpus for decompression. | |
366 | * | |
367 | * We also want to make sure the amount of IO required to do | |
368 | * a random read is reasonably small, so we limit the size of | |
369 | * a compressed extent to 128k. | |
c8b97818 CM |
370 | */ |
371 | total_compressed = min(total_compressed, max_uncompressed); | |
db94535d | 372 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 373 | num_bytes = max(blocksize, num_bytes); |
c8b97818 CM |
374 | total_in = 0; |
375 | ret = 0; | |
db94535d | 376 | |
771ed689 CM |
377 | /* |
378 | * we do compression for mount -o compress and when the | |
379 | * inode has not been flagged as nocompress. This flag can | |
380 | * change at any time if we discover bad compression ratios. | |
c8b97818 | 381 | */ |
6cbff00f | 382 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) && |
1e701a32 CM |
383 | (btrfs_test_opt(root, COMPRESS) || |
384 | (BTRFS_I(inode)->force_compress))) { | |
c8b97818 | 385 | WARN_ON(pages); |
cfbc246e | 386 | pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS); |
c8b97818 | 387 | |
261507a0 LZ |
388 | if (BTRFS_I(inode)->force_compress) |
389 | compress_type = BTRFS_I(inode)->force_compress; | |
390 | ||
391 | ret = btrfs_compress_pages(compress_type, | |
392 | inode->i_mapping, start, | |
393 | total_compressed, pages, | |
394 | nr_pages, &nr_pages_ret, | |
395 | &total_in, | |
396 | &total_compressed, | |
397 | max_compressed); | |
c8b97818 CM |
398 | |
399 | if (!ret) { | |
400 | unsigned long offset = total_compressed & | |
401 | (PAGE_CACHE_SIZE - 1); | |
402 | struct page *page = pages[nr_pages_ret - 1]; | |
403 | char *kaddr; | |
404 | ||
405 | /* zero the tail end of the last page, we might be | |
406 | * sending it down to disk | |
407 | */ | |
408 | if (offset) { | |
409 | kaddr = kmap_atomic(page, KM_USER0); | |
410 | memset(kaddr + offset, 0, | |
411 | PAGE_CACHE_SIZE - offset); | |
412 | kunmap_atomic(kaddr, KM_USER0); | |
413 | } | |
414 | will_compress = 1; | |
415 | } | |
416 | } | |
417 | if (start == 0) { | |
771ed689 | 418 | trans = btrfs_join_transaction(root, 1); |
3612b495 | 419 | BUG_ON(IS_ERR(trans)); |
771ed689 | 420 | btrfs_set_trans_block_group(trans, inode); |
0ca1f7ce | 421 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
771ed689 | 422 | |
c8b97818 | 423 | /* lets try to make an inline extent */ |
771ed689 | 424 | if (ret || total_in < (actual_end - start)) { |
c8b97818 | 425 | /* we didn't compress the entire range, try |
771ed689 | 426 | * to make an uncompressed inline extent. |
c8b97818 CM |
427 | */ |
428 | ret = cow_file_range_inline(trans, root, inode, | |
429 | start, end, 0, NULL); | |
430 | } else { | |
771ed689 | 431 | /* try making a compressed inline extent */ |
c8b97818 CM |
432 | ret = cow_file_range_inline(trans, root, inode, |
433 | start, end, | |
434 | total_compressed, pages); | |
435 | } | |
436 | if (ret == 0) { | |
771ed689 CM |
437 | /* |
438 | * inline extent creation worked, we don't need | |
439 | * to create any more async work items. Unlock | |
440 | * and free up our temp pages. | |
441 | */ | |
c8b97818 | 442 | extent_clear_unlock_delalloc(inode, |
a791e35e CM |
443 | &BTRFS_I(inode)->io_tree, |
444 | start, end, NULL, | |
445 | EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | | |
a3429ab7 | 446 | EXTENT_CLEAR_DELALLOC | |
a791e35e | 447 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK); |
c2167754 YZ |
448 | |
449 | btrfs_end_transaction(trans, root); | |
c8b97818 CM |
450 | goto free_pages_out; |
451 | } | |
c2167754 | 452 | btrfs_end_transaction(trans, root); |
c8b97818 CM |
453 | } |
454 | ||
455 | if (will_compress) { | |
456 | /* | |
457 | * we aren't doing an inline extent round the compressed size | |
458 | * up to a block size boundary so the allocator does sane | |
459 | * things | |
460 | */ | |
461 | total_compressed = (total_compressed + blocksize - 1) & | |
462 | ~(blocksize - 1); | |
463 | ||
464 | /* | |
465 | * one last check to make sure the compression is really a | |
466 | * win, compare the page count read with the blocks on disk | |
467 | */ | |
468 | total_in = (total_in + PAGE_CACHE_SIZE - 1) & | |
469 | ~(PAGE_CACHE_SIZE - 1); | |
470 | if (total_compressed >= total_in) { | |
471 | will_compress = 0; | |
472 | } else { | |
c8b97818 CM |
473 | num_bytes = total_in; |
474 | } | |
475 | } | |
476 | if (!will_compress && pages) { | |
477 | /* | |
478 | * the compression code ran but failed to make things smaller, | |
479 | * free any pages it allocated and our page pointer array | |
480 | */ | |
481 | for (i = 0; i < nr_pages_ret; i++) { | |
70b99e69 | 482 | WARN_ON(pages[i]->mapping); |
c8b97818 CM |
483 | page_cache_release(pages[i]); |
484 | } | |
485 | kfree(pages); | |
486 | pages = NULL; | |
487 | total_compressed = 0; | |
488 | nr_pages_ret = 0; | |
489 | ||
490 | /* flag the file so we don't compress in the future */ | |
1e701a32 CM |
491 | if (!btrfs_test_opt(root, FORCE_COMPRESS) && |
492 | !(BTRFS_I(inode)->force_compress)) { | |
a555f810 | 493 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
1e701a32 | 494 | } |
c8b97818 | 495 | } |
771ed689 CM |
496 | if (will_compress) { |
497 | *num_added += 1; | |
c8b97818 | 498 | |
771ed689 CM |
499 | /* the async work queues will take care of doing actual |
500 | * allocation on disk for these compressed pages, | |
501 | * and will submit them to the elevator. | |
502 | */ | |
503 | add_async_extent(async_cow, start, num_bytes, | |
261507a0 LZ |
504 | total_compressed, pages, nr_pages_ret, |
505 | compress_type); | |
179e29e4 | 506 | |
24ae6365 | 507 | if (start + num_bytes < end) { |
771ed689 CM |
508 | start += num_bytes; |
509 | pages = NULL; | |
510 | cond_resched(); | |
511 | goto again; | |
512 | } | |
513 | } else { | |
f03d9301 | 514 | cleanup_and_bail_uncompressed: |
771ed689 CM |
515 | /* |
516 | * No compression, but we still need to write the pages in | |
517 | * the file we've been given so far. redirty the locked | |
518 | * page if it corresponds to our extent and set things up | |
519 | * for the async work queue to run cow_file_range to do | |
520 | * the normal delalloc dance | |
521 | */ | |
522 | if (page_offset(locked_page) >= start && | |
523 | page_offset(locked_page) <= end) { | |
524 | __set_page_dirty_nobuffers(locked_page); | |
525 | /* unlocked later on in the async handlers */ | |
526 | } | |
261507a0 LZ |
527 | add_async_extent(async_cow, start, end - start + 1, |
528 | 0, NULL, 0, BTRFS_COMPRESS_NONE); | |
771ed689 CM |
529 | *num_added += 1; |
530 | } | |
3b951516 | 531 | |
771ed689 CM |
532 | out: |
533 | return 0; | |
534 | ||
535 | free_pages_out: | |
536 | for (i = 0; i < nr_pages_ret; i++) { | |
537 | WARN_ON(pages[i]->mapping); | |
538 | page_cache_release(pages[i]); | |
539 | } | |
d397712b | 540 | kfree(pages); |
771ed689 CM |
541 | |
542 | goto out; | |
543 | } | |
544 | ||
545 | /* | |
546 | * phase two of compressed writeback. This is the ordered portion | |
547 | * of the code, which only gets called in the order the work was | |
548 | * queued. We walk all the async extents created by compress_file_range | |
549 | * and send them down to the disk. | |
550 | */ | |
551 | static noinline int submit_compressed_extents(struct inode *inode, | |
552 | struct async_cow *async_cow) | |
553 | { | |
554 | struct async_extent *async_extent; | |
555 | u64 alloc_hint = 0; | |
556 | struct btrfs_trans_handle *trans; | |
557 | struct btrfs_key ins; | |
558 | struct extent_map *em; | |
559 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
560 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
561 | struct extent_io_tree *io_tree; | |
f5a84ee3 | 562 | int ret = 0; |
771ed689 CM |
563 | |
564 | if (list_empty(&async_cow->extents)) | |
565 | return 0; | |
566 | ||
771ed689 | 567 | |
d397712b | 568 | while (!list_empty(&async_cow->extents)) { |
771ed689 CM |
569 | async_extent = list_entry(async_cow->extents.next, |
570 | struct async_extent, list); | |
571 | list_del(&async_extent->list); | |
c8b97818 | 572 | |
771ed689 CM |
573 | io_tree = &BTRFS_I(inode)->io_tree; |
574 | ||
f5a84ee3 | 575 | retry: |
771ed689 CM |
576 | /* did the compression code fall back to uncompressed IO? */ |
577 | if (!async_extent->pages) { | |
578 | int page_started = 0; | |
579 | unsigned long nr_written = 0; | |
580 | ||
581 | lock_extent(io_tree, async_extent->start, | |
2ac55d41 JB |
582 | async_extent->start + |
583 | async_extent->ram_size - 1, GFP_NOFS); | |
771ed689 CM |
584 | |
585 | /* allocate blocks */ | |
f5a84ee3 JB |
586 | ret = cow_file_range(inode, async_cow->locked_page, |
587 | async_extent->start, | |
588 | async_extent->start + | |
589 | async_extent->ram_size - 1, | |
590 | &page_started, &nr_written, 0); | |
771ed689 CM |
591 | |
592 | /* | |
593 | * if page_started, cow_file_range inserted an | |
594 | * inline extent and took care of all the unlocking | |
595 | * and IO for us. Otherwise, we need to submit | |
596 | * all those pages down to the drive. | |
597 | */ | |
f5a84ee3 | 598 | if (!page_started && !ret) |
771ed689 CM |
599 | extent_write_locked_range(io_tree, |
600 | inode, async_extent->start, | |
d397712b | 601 | async_extent->start + |
771ed689 CM |
602 | async_extent->ram_size - 1, |
603 | btrfs_get_extent, | |
604 | WB_SYNC_ALL); | |
605 | kfree(async_extent); | |
606 | cond_resched(); | |
607 | continue; | |
608 | } | |
609 | ||
610 | lock_extent(io_tree, async_extent->start, | |
611 | async_extent->start + async_extent->ram_size - 1, | |
612 | GFP_NOFS); | |
771ed689 | 613 | |
c2167754 | 614 | trans = btrfs_join_transaction(root, 1); |
3612b495 | 615 | BUG_ON(IS_ERR(trans)); |
771ed689 CM |
616 | ret = btrfs_reserve_extent(trans, root, |
617 | async_extent->compressed_size, | |
618 | async_extent->compressed_size, | |
619 | 0, alloc_hint, | |
620 | (u64)-1, &ins, 1); | |
c2167754 YZ |
621 | btrfs_end_transaction(trans, root); |
622 | ||
f5a84ee3 JB |
623 | if (ret) { |
624 | int i; | |
625 | for (i = 0; i < async_extent->nr_pages; i++) { | |
626 | WARN_ON(async_extent->pages[i]->mapping); | |
627 | page_cache_release(async_extent->pages[i]); | |
628 | } | |
629 | kfree(async_extent->pages); | |
630 | async_extent->nr_pages = 0; | |
631 | async_extent->pages = NULL; | |
632 | unlock_extent(io_tree, async_extent->start, | |
633 | async_extent->start + | |
634 | async_extent->ram_size - 1, GFP_NOFS); | |
635 | goto retry; | |
636 | } | |
637 | ||
c2167754 YZ |
638 | /* |
639 | * here we're doing allocation and writeback of the | |
640 | * compressed pages | |
641 | */ | |
642 | btrfs_drop_extent_cache(inode, async_extent->start, | |
643 | async_extent->start + | |
644 | async_extent->ram_size - 1, 0); | |
645 | ||
771ed689 | 646 | em = alloc_extent_map(GFP_NOFS); |
c26a9203 | 647 | BUG_ON(!em); |
771ed689 CM |
648 | em->start = async_extent->start; |
649 | em->len = async_extent->ram_size; | |
445a6944 | 650 | em->orig_start = em->start; |
c8b97818 | 651 | |
771ed689 CM |
652 | em->block_start = ins.objectid; |
653 | em->block_len = ins.offset; | |
654 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
261507a0 | 655 | em->compress_type = async_extent->compress_type; |
771ed689 CM |
656 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
657 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); | |
658 | ||
d397712b | 659 | while (1) { |
890871be | 660 | write_lock(&em_tree->lock); |
771ed689 | 661 | ret = add_extent_mapping(em_tree, em); |
890871be | 662 | write_unlock(&em_tree->lock); |
771ed689 CM |
663 | if (ret != -EEXIST) { |
664 | free_extent_map(em); | |
665 | break; | |
666 | } | |
667 | btrfs_drop_extent_cache(inode, async_extent->start, | |
668 | async_extent->start + | |
669 | async_extent->ram_size - 1, 0); | |
670 | } | |
671 | ||
261507a0 LZ |
672 | ret = btrfs_add_ordered_extent_compress(inode, |
673 | async_extent->start, | |
674 | ins.objectid, | |
675 | async_extent->ram_size, | |
676 | ins.offset, | |
677 | BTRFS_ORDERED_COMPRESSED, | |
678 | async_extent->compress_type); | |
771ed689 CM |
679 | BUG_ON(ret); |
680 | ||
771ed689 CM |
681 | /* |
682 | * clear dirty, set writeback and unlock the pages. | |
683 | */ | |
684 | extent_clear_unlock_delalloc(inode, | |
a791e35e CM |
685 | &BTRFS_I(inode)->io_tree, |
686 | async_extent->start, | |
687 | async_extent->start + | |
688 | async_extent->ram_size - 1, | |
689 | NULL, EXTENT_CLEAR_UNLOCK_PAGE | | |
690 | EXTENT_CLEAR_UNLOCK | | |
a3429ab7 | 691 | EXTENT_CLEAR_DELALLOC | |
a791e35e | 692 | EXTENT_CLEAR_DIRTY | EXTENT_SET_WRITEBACK); |
771ed689 CM |
693 | |
694 | ret = btrfs_submit_compressed_write(inode, | |
d397712b CM |
695 | async_extent->start, |
696 | async_extent->ram_size, | |
697 | ins.objectid, | |
698 | ins.offset, async_extent->pages, | |
699 | async_extent->nr_pages); | |
771ed689 CM |
700 | |
701 | BUG_ON(ret); | |
771ed689 CM |
702 | alloc_hint = ins.objectid + ins.offset; |
703 | kfree(async_extent); | |
704 | cond_resched(); | |
705 | } | |
706 | ||
771ed689 CM |
707 | return 0; |
708 | } | |
709 | ||
4b46fce2 JB |
710 | static u64 get_extent_allocation_hint(struct inode *inode, u64 start, |
711 | u64 num_bytes) | |
712 | { | |
713 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
714 | struct extent_map *em; | |
715 | u64 alloc_hint = 0; | |
716 | ||
717 | read_lock(&em_tree->lock); | |
718 | em = search_extent_mapping(em_tree, start, num_bytes); | |
719 | if (em) { | |
720 | /* | |
721 | * if block start isn't an actual block number then find the | |
722 | * first block in this inode and use that as a hint. If that | |
723 | * block is also bogus then just don't worry about it. | |
724 | */ | |
725 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { | |
726 | free_extent_map(em); | |
727 | em = search_extent_mapping(em_tree, 0, 0); | |
728 | if (em && em->block_start < EXTENT_MAP_LAST_BYTE) | |
729 | alloc_hint = em->block_start; | |
730 | if (em) | |
731 | free_extent_map(em); | |
732 | } else { | |
733 | alloc_hint = em->block_start; | |
734 | free_extent_map(em); | |
735 | } | |
736 | } | |
737 | read_unlock(&em_tree->lock); | |
738 | ||
739 | return alloc_hint; | |
740 | } | |
741 | ||
771ed689 CM |
742 | /* |
743 | * when extent_io.c finds a delayed allocation range in the file, | |
744 | * the call backs end up in this code. The basic idea is to | |
745 | * allocate extents on disk for the range, and create ordered data structs | |
746 | * in ram to track those extents. | |
747 | * | |
748 | * locked_page is the page that writepage had locked already. We use | |
749 | * it to make sure we don't do extra locks or unlocks. | |
750 | * | |
751 | * *page_started is set to one if we unlock locked_page and do everything | |
752 | * required to start IO on it. It may be clean and already done with | |
753 | * IO when we return. | |
754 | */ | |
755 | static noinline int cow_file_range(struct inode *inode, | |
756 | struct page *locked_page, | |
757 | u64 start, u64 end, int *page_started, | |
758 | unsigned long *nr_written, | |
759 | int unlock) | |
760 | { | |
761 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
762 | struct btrfs_trans_handle *trans; | |
763 | u64 alloc_hint = 0; | |
764 | u64 num_bytes; | |
765 | unsigned long ram_size; | |
766 | u64 disk_num_bytes; | |
767 | u64 cur_alloc_size; | |
768 | u64 blocksize = root->sectorsize; | |
771ed689 CM |
769 | struct btrfs_key ins; |
770 | struct extent_map *em; | |
771 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
772 | int ret = 0; | |
773 | ||
0cb59c99 | 774 | BUG_ON(root == root->fs_info->tree_root); |
771ed689 | 775 | trans = btrfs_join_transaction(root, 1); |
3612b495 | 776 | BUG_ON(IS_ERR(trans)); |
771ed689 | 777 | btrfs_set_trans_block_group(trans, inode); |
0ca1f7ce | 778 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
771ed689 | 779 | |
771ed689 CM |
780 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
781 | num_bytes = max(blocksize, num_bytes); | |
782 | disk_num_bytes = num_bytes; | |
783 | ret = 0; | |
784 | ||
785 | if (start == 0) { | |
786 | /* lets try to make an inline extent */ | |
787 | ret = cow_file_range_inline(trans, root, inode, | |
788 | start, end, 0, NULL); | |
789 | if (ret == 0) { | |
790 | extent_clear_unlock_delalloc(inode, | |
a791e35e CM |
791 | &BTRFS_I(inode)->io_tree, |
792 | start, end, NULL, | |
793 | EXTENT_CLEAR_UNLOCK_PAGE | | |
794 | EXTENT_CLEAR_UNLOCK | | |
795 | EXTENT_CLEAR_DELALLOC | | |
796 | EXTENT_CLEAR_DIRTY | | |
797 | EXTENT_SET_WRITEBACK | | |
798 | EXTENT_END_WRITEBACK); | |
c2167754 | 799 | |
771ed689 CM |
800 | *nr_written = *nr_written + |
801 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; | |
802 | *page_started = 1; | |
803 | ret = 0; | |
804 | goto out; | |
805 | } | |
806 | } | |
807 | ||
808 | BUG_ON(disk_num_bytes > | |
809 | btrfs_super_total_bytes(&root->fs_info->super_copy)); | |
810 | ||
4b46fce2 | 811 | alloc_hint = get_extent_allocation_hint(inode, start, num_bytes); |
771ed689 CM |
812 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
813 | ||
d397712b | 814 | while (disk_num_bytes > 0) { |
a791e35e CM |
815 | unsigned long op; |
816 | ||
287a0ab9 | 817 | cur_alloc_size = disk_num_bytes; |
e6dcd2dc | 818 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
771ed689 | 819 | root->sectorsize, 0, alloc_hint, |
e6dcd2dc | 820 | (u64)-1, &ins, 1); |
d397712b CM |
821 | BUG_ON(ret); |
822 | ||
e6dcd2dc | 823 | em = alloc_extent_map(GFP_NOFS); |
c26a9203 | 824 | BUG_ON(!em); |
e6dcd2dc | 825 | em->start = start; |
445a6944 | 826 | em->orig_start = em->start; |
771ed689 CM |
827 | ram_size = ins.offset; |
828 | em->len = ins.offset; | |
c8b97818 | 829 | |
e6dcd2dc | 830 | em->block_start = ins.objectid; |
c8b97818 | 831 | em->block_len = ins.offset; |
e6dcd2dc | 832 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
7f3c74fb | 833 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
c8b97818 | 834 | |
d397712b | 835 | while (1) { |
890871be | 836 | write_lock(&em_tree->lock); |
e6dcd2dc | 837 | ret = add_extent_mapping(em_tree, em); |
890871be | 838 | write_unlock(&em_tree->lock); |
e6dcd2dc CM |
839 | if (ret != -EEXIST) { |
840 | free_extent_map(em); | |
841 | break; | |
842 | } | |
843 | btrfs_drop_extent_cache(inode, start, | |
c8b97818 | 844 | start + ram_size - 1, 0); |
e6dcd2dc CM |
845 | } |
846 | ||
98d20f67 | 847 | cur_alloc_size = ins.offset; |
e6dcd2dc | 848 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
771ed689 | 849 | ram_size, cur_alloc_size, 0); |
e6dcd2dc | 850 | BUG_ON(ret); |
c8b97818 | 851 | |
17d217fe YZ |
852 | if (root->root_key.objectid == |
853 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
854 | ret = btrfs_reloc_clone_csums(inode, start, | |
855 | cur_alloc_size); | |
856 | BUG_ON(ret); | |
857 | } | |
858 | ||
d397712b | 859 | if (disk_num_bytes < cur_alloc_size) |
3b951516 | 860 | break; |
d397712b | 861 | |
c8b97818 CM |
862 | /* we're not doing compressed IO, don't unlock the first |
863 | * page (which the caller expects to stay locked), don't | |
864 | * clear any dirty bits and don't set any writeback bits | |
8b62b72b CM |
865 | * |
866 | * Do set the Private2 bit so we know this page was properly | |
867 | * setup for writepage | |
c8b97818 | 868 | */ |
a791e35e CM |
869 | op = unlock ? EXTENT_CLEAR_UNLOCK_PAGE : 0; |
870 | op |= EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | | |
871 | EXTENT_SET_PRIVATE2; | |
872 | ||
c8b97818 CM |
873 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
874 | start, start + ram_size - 1, | |
a791e35e | 875 | locked_page, op); |
c8b97818 | 876 | disk_num_bytes -= cur_alloc_size; |
c59f8951 CM |
877 | num_bytes -= cur_alloc_size; |
878 | alloc_hint = ins.objectid + ins.offset; | |
879 | start += cur_alloc_size; | |
b888db2b | 880 | } |
b888db2b | 881 | out: |
771ed689 | 882 | ret = 0; |
b888db2b | 883 | btrfs_end_transaction(trans, root); |
c8b97818 | 884 | |
be20aa9d | 885 | return ret; |
771ed689 | 886 | } |
c8b97818 | 887 | |
771ed689 CM |
888 | /* |
889 | * work queue call back to started compression on a file and pages | |
890 | */ | |
891 | static noinline void async_cow_start(struct btrfs_work *work) | |
892 | { | |
893 | struct async_cow *async_cow; | |
894 | int num_added = 0; | |
895 | async_cow = container_of(work, struct async_cow, work); | |
896 | ||
897 | compress_file_range(async_cow->inode, async_cow->locked_page, | |
898 | async_cow->start, async_cow->end, async_cow, | |
899 | &num_added); | |
900 | if (num_added == 0) | |
901 | async_cow->inode = NULL; | |
902 | } | |
903 | ||
904 | /* | |
905 | * work queue call back to submit previously compressed pages | |
906 | */ | |
907 | static noinline void async_cow_submit(struct btrfs_work *work) | |
908 | { | |
909 | struct async_cow *async_cow; | |
910 | struct btrfs_root *root; | |
911 | unsigned long nr_pages; | |
912 | ||
913 | async_cow = container_of(work, struct async_cow, work); | |
914 | ||
915 | root = async_cow->root; | |
916 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> | |
917 | PAGE_CACHE_SHIFT; | |
918 | ||
919 | atomic_sub(nr_pages, &root->fs_info->async_delalloc_pages); | |
920 | ||
921 | if (atomic_read(&root->fs_info->async_delalloc_pages) < | |
922 | 5 * 1042 * 1024 && | |
923 | waitqueue_active(&root->fs_info->async_submit_wait)) | |
924 | wake_up(&root->fs_info->async_submit_wait); | |
925 | ||
d397712b | 926 | if (async_cow->inode) |
771ed689 | 927 | submit_compressed_extents(async_cow->inode, async_cow); |
771ed689 | 928 | } |
c8b97818 | 929 | |
771ed689 CM |
930 | static noinline void async_cow_free(struct btrfs_work *work) |
931 | { | |
932 | struct async_cow *async_cow; | |
933 | async_cow = container_of(work, struct async_cow, work); | |
934 | kfree(async_cow); | |
935 | } | |
936 | ||
937 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, | |
938 | u64 start, u64 end, int *page_started, | |
939 | unsigned long *nr_written) | |
940 | { | |
941 | struct async_cow *async_cow; | |
942 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
943 | unsigned long nr_pages; | |
944 | u64 cur_end; | |
945 | int limit = 10 * 1024 * 1042; | |
946 | ||
a3429ab7 CM |
947 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED, |
948 | 1, 0, NULL, GFP_NOFS); | |
d397712b | 949 | while (start < end) { |
771ed689 CM |
950 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
951 | async_cow->inode = inode; | |
952 | async_cow->root = root; | |
953 | async_cow->locked_page = locked_page; | |
954 | async_cow->start = start; | |
955 | ||
6cbff00f | 956 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) |
771ed689 CM |
957 | cur_end = end; |
958 | else | |
959 | cur_end = min(end, start + 512 * 1024 - 1); | |
960 | ||
961 | async_cow->end = cur_end; | |
962 | INIT_LIST_HEAD(&async_cow->extents); | |
963 | ||
964 | async_cow->work.func = async_cow_start; | |
965 | async_cow->work.ordered_func = async_cow_submit; | |
966 | async_cow->work.ordered_free = async_cow_free; | |
967 | async_cow->work.flags = 0; | |
968 | ||
771ed689 CM |
969 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
970 | PAGE_CACHE_SHIFT; | |
971 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); | |
972 | ||
973 | btrfs_queue_worker(&root->fs_info->delalloc_workers, | |
974 | &async_cow->work); | |
975 | ||
976 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { | |
977 | wait_event(root->fs_info->async_submit_wait, | |
978 | (atomic_read(&root->fs_info->async_delalloc_pages) < | |
979 | limit)); | |
980 | } | |
981 | ||
d397712b | 982 | while (atomic_read(&root->fs_info->async_submit_draining) && |
771ed689 CM |
983 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
984 | wait_event(root->fs_info->async_submit_wait, | |
985 | (atomic_read(&root->fs_info->async_delalloc_pages) == | |
986 | 0)); | |
987 | } | |
988 | ||
989 | *nr_written += nr_pages; | |
990 | start = cur_end + 1; | |
991 | } | |
992 | *page_started = 1; | |
993 | return 0; | |
be20aa9d CM |
994 | } |
995 | ||
d397712b | 996 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
17d217fe YZ |
997 | u64 bytenr, u64 num_bytes) |
998 | { | |
999 | int ret; | |
1000 | struct btrfs_ordered_sum *sums; | |
1001 | LIST_HEAD(list); | |
1002 | ||
07d400a6 YZ |
1003 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
1004 | bytenr + num_bytes - 1, &list); | |
17d217fe YZ |
1005 | if (ret == 0 && list_empty(&list)) |
1006 | return 0; | |
1007 | ||
1008 | while (!list_empty(&list)) { | |
1009 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
1010 | list_del(&sums->list); | |
1011 | kfree(sums); | |
1012 | } | |
1013 | return 1; | |
1014 | } | |
1015 | ||
d352ac68 CM |
1016 | /* |
1017 | * when nowcow writeback call back. This checks for snapshots or COW copies | |
1018 | * of the extents that exist in the file, and COWs the file as required. | |
1019 | * | |
1020 | * If no cow copies or snapshots exist, we write directly to the existing | |
1021 | * blocks on disk | |
1022 | */ | |
7f366cfe CM |
1023 | static noinline int run_delalloc_nocow(struct inode *inode, |
1024 | struct page *locked_page, | |
771ed689 CM |
1025 | u64 start, u64 end, int *page_started, int force, |
1026 | unsigned long *nr_written) | |
be20aa9d | 1027 | { |
be20aa9d | 1028 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7ea394f1 | 1029 | struct btrfs_trans_handle *trans; |
be20aa9d | 1030 | struct extent_buffer *leaf; |
be20aa9d | 1031 | struct btrfs_path *path; |
80ff3856 | 1032 | struct btrfs_file_extent_item *fi; |
be20aa9d | 1033 | struct btrfs_key found_key; |
80ff3856 YZ |
1034 | u64 cow_start; |
1035 | u64 cur_offset; | |
1036 | u64 extent_end; | |
5d4f98a2 | 1037 | u64 extent_offset; |
80ff3856 YZ |
1038 | u64 disk_bytenr; |
1039 | u64 num_bytes; | |
1040 | int extent_type; | |
1041 | int ret; | |
d899e052 | 1042 | int type; |
80ff3856 YZ |
1043 | int nocow; |
1044 | int check_prev = 1; | |
0cb59c99 | 1045 | bool nolock = false; |
be20aa9d CM |
1046 | |
1047 | path = btrfs_alloc_path(); | |
1048 | BUG_ON(!path); | |
0cb59c99 JB |
1049 | if (root == root->fs_info->tree_root) { |
1050 | nolock = true; | |
1051 | trans = btrfs_join_transaction_nolock(root, 1); | |
1052 | } else { | |
1053 | trans = btrfs_join_transaction(root, 1); | |
1054 | } | |
3612b495 | 1055 | BUG_ON(IS_ERR(trans)); |
be20aa9d | 1056 | |
80ff3856 YZ |
1057 | cow_start = (u64)-1; |
1058 | cur_offset = start; | |
1059 | while (1) { | |
1060 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1061 | cur_offset, 0); | |
1062 | BUG_ON(ret < 0); | |
1063 | if (ret > 0 && path->slots[0] > 0 && check_prev) { | |
1064 | leaf = path->nodes[0]; | |
1065 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1066 | path->slots[0] - 1); | |
1067 | if (found_key.objectid == inode->i_ino && | |
1068 | found_key.type == BTRFS_EXTENT_DATA_KEY) | |
1069 | path->slots[0]--; | |
1070 | } | |
1071 | check_prev = 0; | |
1072 | next_slot: | |
1073 | leaf = path->nodes[0]; | |
1074 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1075 | ret = btrfs_next_leaf(root, path); | |
1076 | if (ret < 0) | |
1077 | BUG_ON(1); | |
1078 | if (ret > 0) | |
1079 | break; | |
1080 | leaf = path->nodes[0]; | |
1081 | } | |
be20aa9d | 1082 | |
80ff3856 YZ |
1083 | nocow = 0; |
1084 | disk_bytenr = 0; | |
17d217fe | 1085 | num_bytes = 0; |
80ff3856 YZ |
1086 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1087 | ||
1088 | if (found_key.objectid > inode->i_ino || | |
1089 | found_key.type > BTRFS_EXTENT_DATA_KEY || | |
1090 | found_key.offset > end) | |
1091 | break; | |
1092 | ||
1093 | if (found_key.offset > cur_offset) { | |
1094 | extent_end = found_key.offset; | |
e9061e21 | 1095 | extent_type = 0; |
80ff3856 YZ |
1096 | goto out_check; |
1097 | } | |
1098 | ||
1099 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1100 | struct btrfs_file_extent_item); | |
1101 | extent_type = btrfs_file_extent_type(leaf, fi); | |
1102 | ||
d899e052 YZ |
1103 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
1104 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
80ff3856 | 1105 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
5d4f98a2 | 1106 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
80ff3856 YZ |
1107 | extent_end = found_key.offset + |
1108 | btrfs_file_extent_num_bytes(leaf, fi); | |
1109 | if (extent_end <= start) { | |
1110 | path->slots[0]++; | |
1111 | goto next_slot; | |
1112 | } | |
17d217fe YZ |
1113 | if (disk_bytenr == 0) |
1114 | goto out_check; | |
80ff3856 YZ |
1115 | if (btrfs_file_extent_compression(leaf, fi) || |
1116 | btrfs_file_extent_encryption(leaf, fi) || | |
1117 | btrfs_file_extent_other_encoding(leaf, fi)) | |
1118 | goto out_check; | |
d899e052 YZ |
1119 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
1120 | goto out_check; | |
d2fb3437 | 1121 | if (btrfs_extent_readonly(root, disk_bytenr)) |
80ff3856 | 1122 | goto out_check; |
17d217fe | 1123 | if (btrfs_cross_ref_exist(trans, root, inode->i_ino, |
5d4f98a2 YZ |
1124 | found_key.offset - |
1125 | extent_offset, disk_bytenr)) | |
17d217fe | 1126 | goto out_check; |
5d4f98a2 | 1127 | disk_bytenr += extent_offset; |
17d217fe YZ |
1128 | disk_bytenr += cur_offset - found_key.offset; |
1129 | num_bytes = min(end + 1, extent_end) - cur_offset; | |
1130 | /* | |
1131 | * force cow if csum exists in the range. | |
1132 | * this ensure that csum for a given extent are | |
1133 | * either valid or do not exist. | |
1134 | */ | |
1135 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
1136 | goto out_check; | |
80ff3856 YZ |
1137 | nocow = 1; |
1138 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
1139 | extent_end = found_key.offset + | |
1140 | btrfs_file_extent_inline_len(leaf, fi); | |
1141 | extent_end = ALIGN(extent_end, root->sectorsize); | |
1142 | } else { | |
1143 | BUG_ON(1); | |
1144 | } | |
1145 | out_check: | |
1146 | if (extent_end <= start) { | |
1147 | path->slots[0]++; | |
1148 | goto next_slot; | |
1149 | } | |
1150 | if (!nocow) { | |
1151 | if (cow_start == (u64)-1) | |
1152 | cow_start = cur_offset; | |
1153 | cur_offset = extent_end; | |
1154 | if (cur_offset > end) | |
1155 | break; | |
1156 | path->slots[0]++; | |
1157 | goto next_slot; | |
7ea394f1 YZ |
1158 | } |
1159 | ||
1160 | btrfs_release_path(root, path); | |
80ff3856 YZ |
1161 | if (cow_start != (u64)-1) { |
1162 | ret = cow_file_range(inode, locked_page, cow_start, | |
771ed689 CM |
1163 | found_key.offset - 1, page_started, |
1164 | nr_written, 1); | |
80ff3856 YZ |
1165 | BUG_ON(ret); |
1166 | cow_start = (u64)-1; | |
7ea394f1 | 1167 | } |
80ff3856 | 1168 | |
d899e052 YZ |
1169 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
1170 | struct extent_map *em; | |
1171 | struct extent_map_tree *em_tree; | |
1172 | em_tree = &BTRFS_I(inode)->extent_tree; | |
1173 | em = alloc_extent_map(GFP_NOFS); | |
c26a9203 | 1174 | BUG_ON(!em); |
d899e052 | 1175 | em->start = cur_offset; |
445a6944 | 1176 | em->orig_start = em->start; |
d899e052 YZ |
1177 | em->len = num_bytes; |
1178 | em->block_len = num_bytes; | |
1179 | em->block_start = disk_bytenr; | |
1180 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
1181 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
1182 | while (1) { | |
890871be | 1183 | write_lock(&em_tree->lock); |
d899e052 | 1184 | ret = add_extent_mapping(em_tree, em); |
890871be | 1185 | write_unlock(&em_tree->lock); |
d899e052 YZ |
1186 | if (ret != -EEXIST) { |
1187 | free_extent_map(em); | |
1188 | break; | |
1189 | } | |
1190 | btrfs_drop_extent_cache(inode, em->start, | |
1191 | em->start + em->len - 1, 0); | |
1192 | } | |
1193 | type = BTRFS_ORDERED_PREALLOC; | |
1194 | } else { | |
1195 | type = BTRFS_ORDERED_NOCOW; | |
1196 | } | |
80ff3856 YZ |
1197 | |
1198 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, | |
d899e052 YZ |
1199 | num_bytes, num_bytes, type); |
1200 | BUG_ON(ret); | |
771ed689 | 1201 | |
efa56464 YZ |
1202 | if (root->root_key.objectid == |
1203 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1204 | ret = btrfs_reloc_clone_csums(inode, cur_offset, | |
1205 | num_bytes); | |
1206 | BUG_ON(ret); | |
1207 | } | |
1208 | ||
d899e052 | 1209 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
a791e35e CM |
1210 | cur_offset, cur_offset + num_bytes - 1, |
1211 | locked_page, EXTENT_CLEAR_UNLOCK_PAGE | | |
1212 | EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | | |
1213 | EXTENT_SET_PRIVATE2); | |
80ff3856 YZ |
1214 | cur_offset = extent_end; |
1215 | if (cur_offset > end) | |
1216 | break; | |
be20aa9d | 1217 | } |
80ff3856 YZ |
1218 | btrfs_release_path(root, path); |
1219 | ||
1220 | if (cur_offset <= end && cow_start == (u64)-1) | |
1221 | cow_start = cur_offset; | |
1222 | if (cow_start != (u64)-1) { | |
1223 | ret = cow_file_range(inode, locked_page, cow_start, end, | |
771ed689 | 1224 | page_started, nr_written, 1); |
80ff3856 YZ |
1225 | BUG_ON(ret); |
1226 | } | |
1227 | ||
0cb59c99 JB |
1228 | if (nolock) { |
1229 | ret = btrfs_end_transaction_nolock(trans, root); | |
1230 | BUG_ON(ret); | |
1231 | } else { | |
1232 | ret = btrfs_end_transaction(trans, root); | |
1233 | BUG_ON(ret); | |
1234 | } | |
7ea394f1 | 1235 | btrfs_free_path(path); |
80ff3856 | 1236 | return 0; |
be20aa9d CM |
1237 | } |
1238 | ||
d352ac68 CM |
1239 | /* |
1240 | * extent_io.c call back to do delayed allocation processing | |
1241 | */ | |
c8b97818 | 1242 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
771ed689 CM |
1243 | u64 start, u64 end, int *page_started, |
1244 | unsigned long *nr_written) | |
be20aa9d | 1245 | { |
be20aa9d | 1246 | int ret; |
7f366cfe | 1247 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a2135011 | 1248 | |
6cbff00f | 1249 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) |
c8b97818 | 1250 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1251 | page_started, 1, nr_written); |
6cbff00f | 1252 | else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC) |
d899e052 | 1253 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1254 | page_started, 0, nr_written); |
1e701a32 CM |
1255 | else if (!btrfs_test_opt(root, COMPRESS) && |
1256 | !(BTRFS_I(inode)->force_compress)) | |
7f366cfe CM |
1257 | ret = cow_file_range(inode, locked_page, start, end, |
1258 | page_started, nr_written, 1); | |
be20aa9d | 1259 | else |
771ed689 | 1260 | ret = cow_file_range_async(inode, locked_page, start, end, |
d397712b | 1261 | page_started, nr_written); |
b888db2b CM |
1262 | return ret; |
1263 | } | |
1264 | ||
9ed74f2d | 1265 | static int btrfs_split_extent_hook(struct inode *inode, |
0ca1f7ce | 1266 | struct extent_state *orig, u64 split) |
9ed74f2d | 1267 | { |
0ca1f7ce | 1268 | /* not delalloc, ignore it */ |
9ed74f2d JB |
1269 | if (!(orig->state & EXTENT_DELALLOC)) |
1270 | return 0; | |
1271 | ||
0ca1f7ce | 1272 | atomic_inc(&BTRFS_I(inode)->outstanding_extents); |
9ed74f2d JB |
1273 | return 0; |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * extent_io.c merge_extent_hook, used to track merged delayed allocation | |
1278 | * extents so we can keep track of new extents that are just merged onto old | |
1279 | * extents, such as when we are doing sequential writes, so we can properly | |
1280 | * account for the metadata space we'll need. | |
1281 | */ | |
1282 | static int btrfs_merge_extent_hook(struct inode *inode, | |
1283 | struct extent_state *new, | |
1284 | struct extent_state *other) | |
1285 | { | |
9ed74f2d JB |
1286 | /* not delalloc, ignore it */ |
1287 | if (!(other->state & EXTENT_DELALLOC)) | |
1288 | return 0; | |
1289 | ||
0ca1f7ce | 1290 | atomic_dec(&BTRFS_I(inode)->outstanding_extents); |
9ed74f2d JB |
1291 | return 0; |
1292 | } | |
1293 | ||
d352ac68 CM |
1294 | /* |
1295 | * extent_io.c set_bit_hook, used to track delayed allocation | |
1296 | * bytes in this file, and to maintain the list of inodes that | |
1297 | * have pending delalloc work to be done. | |
1298 | */ | |
0ca1f7ce YZ |
1299 | static int btrfs_set_bit_hook(struct inode *inode, |
1300 | struct extent_state *state, int *bits) | |
291d673e | 1301 | { |
9ed74f2d | 1302 | |
75eff68e CM |
1303 | /* |
1304 | * set_bit and clear bit hooks normally require _irqsave/restore | |
1305 | * but in this case, we are only testeing for the DELALLOC | |
1306 | * bit, which is only set or cleared with irqs on | |
1307 | */ | |
0ca1f7ce | 1308 | if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1309 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1310 | u64 len = state->end + 1 - state->start; |
0cb59c99 JB |
1311 | int do_list = (root->root_key.objectid != |
1312 | BTRFS_ROOT_TREE_OBJECTID); | |
9ed74f2d | 1313 | |
0ca1f7ce YZ |
1314 | if (*bits & EXTENT_FIRST_DELALLOC) |
1315 | *bits &= ~EXTENT_FIRST_DELALLOC; | |
1316 | else | |
1317 | atomic_inc(&BTRFS_I(inode)->outstanding_extents); | |
287a0ab9 | 1318 | |
75eff68e | 1319 | spin_lock(&root->fs_info->delalloc_lock); |
0ca1f7ce YZ |
1320 | BTRFS_I(inode)->delalloc_bytes += len; |
1321 | root->fs_info->delalloc_bytes += len; | |
0cb59c99 | 1322 | if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
ea8c2819 CM |
1323 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, |
1324 | &root->fs_info->delalloc_inodes); | |
1325 | } | |
75eff68e | 1326 | spin_unlock(&root->fs_info->delalloc_lock); |
291d673e CM |
1327 | } |
1328 | return 0; | |
1329 | } | |
1330 | ||
d352ac68 CM |
1331 | /* |
1332 | * extent_io.c clear_bit_hook, see set_bit_hook for why | |
1333 | */ | |
9ed74f2d | 1334 | static int btrfs_clear_bit_hook(struct inode *inode, |
0ca1f7ce | 1335 | struct extent_state *state, int *bits) |
291d673e | 1336 | { |
75eff68e CM |
1337 | /* |
1338 | * set_bit and clear bit hooks normally require _irqsave/restore | |
1339 | * but in this case, we are only testeing for the DELALLOC | |
1340 | * bit, which is only set or cleared with irqs on | |
1341 | */ | |
0ca1f7ce | 1342 | if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1343 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1344 | u64 len = state->end + 1 - state->start; |
0cb59c99 JB |
1345 | int do_list = (root->root_key.objectid != |
1346 | BTRFS_ROOT_TREE_OBJECTID); | |
bcbfce8a | 1347 | |
0ca1f7ce YZ |
1348 | if (*bits & EXTENT_FIRST_DELALLOC) |
1349 | *bits &= ~EXTENT_FIRST_DELALLOC; | |
1350 | else if (!(*bits & EXTENT_DO_ACCOUNTING)) | |
1351 | atomic_dec(&BTRFS_I(inode)->outstanding_extents); | |
1352 | ||
1353 | if (*bits & EXTENT_DO_ACCOUNTING) | |
1354 | btrfs_delalloc_release_metadata(inode, len); | |
1355 | ||
0cb59c99 JB |
1356 | if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
1357 | && do_list) | |
0ca1f7ce | 1358 | btrfs_free_reserved_data_space(inode, len); |
9ed74f2d | 1359 | |
75eff68e | 1360 | spin_lock(&root->fs_info->delalloc_lock); |
0ca1f7ce YZ |
1361 | root->fs_info->delalloc_bytes -= len; |
1362 | BTRFS_I(inode)->delalloc_bytes -= len; | |
1363 | ||
0cb59c99 | 1364 | if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && |
ea8c2819 CM |
1365 | !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
1366 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); | |
1367 | } | |
75eff68e | 1368 | spin_unlock(&root->fs_info->delalloc_lock); |
291d673e CM |
1369 | } |
1370 | return 0; | |
1371 | } | |
1372 | ||
d352ac68 CM |
1373 | /* |
1374 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure | |
1375 | * we don't create bios that span stripes or chunks | |
1376 | */ | |
239b14b3 | 1377 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
c8b97818 CM |
1378 | size_t size, struct bio *bio, |
1379 | unsigned long bio_flags) | |
239b14b3 CM |
1380 | { |
1381 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
1382 | struct btrfs_mapping_tree *map_tree; | |
a62b9401 | 1383 | u64 logical = (u64)bio->bi_sector << 9; |
239b14b3 CM |
1384 | u64 length = 0; |
1385 | u64 map_length; | |
239b14b3 CM |
1386 | int ret; |
1387 | ||
771ed689 CM |
1388 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
1389 | return 0; | |
1390 | ||
f2d8d74d | 1391 | length = bio->bi_size; |
239b14b3 CM |
1392 | map_tree = &root->fs_info->mapping_tree; |
1393 | map_length = length; | |
cea9e445 | 1394 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 1395 | &map_length, NULL, 0); |
cea9e445 | 1396 | |
d397712b | 1397 | if (map_length < length + size) |
239b14b3 | 1398 | return 1; |
411fc6bc | 1399 | return ret; |
239b14b3 CM |
1400 | } |
1401 | ||
d352ac68 CM |
1402 | /* |
1403 | * in order to insert checksums into the metadata in large chunks, | |
1404 | * we wait until bio submission time. All the pages in the bio are | |
1405 | * checksummed and sums are attached onto the ordered extent record. | |
1406 | * | |
1407 | * At IO completion time the cums attached on the ordered extent record | |
1408 | * are inserted into the btree | |
1409 | */ | |
d397712b CM |
1410 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
1411 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
1412 | unsigned long bio_flags, |
1413 | u64 bio_offset) | |
065631f6 | 1414 | { |
065631f6 | 1415 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 1416 | int ret = 0; |
e015640f | 1417 | |
d20f7043 | 1418 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
44b8bd7e | 1419 | BUG_ON(ret); |
4a69a410 CM |
1420 | return 0; |
1421 | } | |
e015640f | 1422 | |
4a69a410 CM |
1423 | /* |
1424 | * in order to insert checksums into the metadata in large chunks, | |
1425 | * we wait until bio submission time. All the pages in the bio are | |
1426 | * checksummed and sums are attached onto the ordered extent record. | |
1427 | * | |
1428 | * At IO completion time the cums attached on the ordered extent record | |
1429 | * are inserted into the btree | |
1430 | */ | |
b2950863 | 1431 | static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1432 | int mirror_num, unsigned long bio_flags, |
1433 | u64 bio_offset) | |
4a69a410 CM |
1434 | { |
1435 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8b712842 | 1436 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
44b8bd7e CM |
1437 | } |
1438 | ||
d352ac68 | 1439 | /* |
cad321ad CM |
1440 | * extent_io.c submission hook. This does the right thing for csum calculation |
1441 | * on write, or reading the csums from the tree before a read | |
d352ac68 | 1442 | */ |
b2950863 | 1443 | static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1444 | int mirror_num, unsigned long bio_flags, |
1445 | u64 bio_offset) | |
44b8bd7e CM |
1446 | { |
1447 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1448 | int ret = 0; | |
19b9bdb0 | 1449 | int skip_sum; |
44b8bd7e | 1450 | |
6cbff00f | 1451 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
cad321ad | 1452 | |
0cb59c99 JB |
1453 | if (root == root->fs_info->tree_root) |
1454 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 2); | |
1455 | else | |
1456 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); | |
e6dcd2dc | 1457 | BUG_ON(ret); |
065631f6 | 1458 | |
7b6d91da | 1459 | if (!(rw & REQ_WRITE)) { |
d20f7043 | 1460 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
c8b97818 CM |
1461 | return btrfs_submit_compressed_read(inode, bio, |
1462 | mirror_num, bio_flags); | |
d20f7043 CM |
1463 | } else if (!skip_sum) |
1464 | btrfs_lookup_bio_sums(root, inode, bio, NULL); | |
4d1b5fb4 | 1465 | goto mapit; |
19b9bdb0 | 1466 | } else if (!skip_sum) { |
17d217fe YZ |
1467 | /* csum items have already been cloned */ |
1468 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) | |
1469 | goto mapit; | |
19b9bdb0 CM |
1470 | /* we're doing a write, do the async checksumming */ |
1471 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, | |
44b8bd7e | 1472 | inode, rw, bio, mirror_num, |
eaf25d93 CM |
1473 | bio_flags, bio_offset, |
1474 | __btrfs_submit_bio_start, | |
4a69a410 | 1475 | __btrfs_submit_bio_done); |
19b9bdb0 CM |
1476 | } |
1477 | ||
0b86a832 | 1478 | mapit: |
8b712842 | 1479 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
065631f6 | 1480 | } |
6885f308 | 1481 | |
d352ac68 CM |
1482 | /* |
1483 | * given a list of ordered sums record them in the inode. This happens | |
1484 | * at IO completion time based on sums calculated at bio submission time. | |
1485 | */ | |
ba1da2f4 | 1486 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
1487 | struct inode *inode, u64 file_offset, |
1488 | struct list_head *list) | |
1489 | { | |
e6dcd2dc CM |
1490 | struct btrfs_ordered_sum *sum; |
1491 | ||
1492 | btrfs_set_trans_block_group(trans, inode); | |
c6e30871 QF |
1493 | |
1494 | list_for_each_entry(sum, list, list) { | |
d20f7043 CM |
1495 | btrfs_csum_file_blocks(trans, |
1496 | BTRFS_I(inode)->root->fs_info->csum_root, sum); | |
e6dcd2dc CM |
1497 | } |
1498 | return 0; | |
1499 | } | |
1500 | ||
2ac55d41 JB |
1501 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
1502 | struct extent_state **cached_state) | |
ea8c2819 | 1503 | { |
d397712b | 1504 | if ((end & (PAGE_CACHE_SIZE - 1)) == 0) |
771ed689 | 1505 | WARN_ON(1); |
ea8c2819 | 1506 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
2ac55d41 | 1507 | cached_state, GFP_NOFS); |
ea8c2819 CM |
1508 | } |
1509 | ||
d352ac68 | 1510 | /* see btrfs_writepage_start_hook for details on why this is required */ |
247e743c CM |
1511 | struct btrfs_writepage_fixup { |
1512 | struct page *page; | |
1513 | struct btrfs_work work; | |
1514 | }; | |
1515 | ||
b2950863 | 1516 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
247e743c CM |
1517 | { |
1518 | struct btrfs_writepage_fixup *fixup; | |
1519 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 1520 | struct extent_state *cached_state = NULL; |
247e743c CM |
1521 | struct page *page; |
1522 | struct inode *inode; | |
1523 | u64 page_start; | |
1524 | u64 page_end; | |
1525 | ||
1526 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
1527 | page = fixup->page; | |
4a096752 | 1528 | again: |
247e743c CM |
1529 | lock_page(page); |
1530 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
1531 | ClearPageChecked(page); | |
1532 | goto out_page; | |
1533 | } | |
1534 | ||
1535 | inode = page->mapping->host; | |
1536 | page_start = page_offset(page); | |
1537 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
1538 | ||
2ac55d41 JB |
1539 | lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0, |
1540 | &cached_state, GFP_NOFS); | |
4a096752 CM |
1541 | |
1542 | /* already ordered? We're done */ | |
8b62b72b | 1543 | if (PagePrivate2(page)) |
247e743c | 1544 | goto out; |
4a096752 CM |
1545 | |
1546 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1547 | if (ordered) { | |
2ac55d41 JB |
1548 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, |
1549 | page_end, &cached_state, GFP_NOFS); | |
4a096752 CM |
1550 | unlock_page(page); |
1551 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1552 | goto again; | |
1553 | } | |
247e743c | 1554 | |
0ca1f7ce | 1555 | BUG(); |
2ac55d41 | 1556 | btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state); |
247e743c CM |
1557 | ClearPageChecked(page); |
1558 | out: | |
2ac55d41 JB |
1559 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end, |
1560 | &cached_state, GFP_NOFS); | |
247e743c CM |
1561 | out_page: |
1562 | unlock_page(page); | |
1563 | page_cache_release(page); | |
b897abec | 1564 | kfree(fixup); |
247e743c CM |
1565 | } |
1566 | ||
1567 | /* | |
1568 | * There are a few paths in the higher layers of the kernel that directly | |
1569 | * set the page dirty bit without asking the filesystem if it is a | |
1570 | * good idea. This causes problems because we want to make sure COW | |
1571 | * properly happens and the data=ordered rules are followed. | |
1572 | * | |
c8b97818 | 1573 | * In our case any range that doesn't have the ORDERED bit set |
247e743c CM |
1574 | * hasn't been properly setup for IO. We kick off an async process |
1575 | * to fix it up. The async helper will wait for ordered extents, set | |
1576 | * the delalloc bit and make it safe to write the page. | |
1577 | */ | |
b2950863 | 1578 | static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) |
247e743c CM |
1579 | { |
1580 | struct inode *inode = page->mapping->host; | |
1581 | struct btrfs_writepage_fixup *fixup; | |
1582 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
247e743c | 1583 | |
8b62b72b CM |
1584 | /* this page is properly in the ordered list */ |
1585 | if (TestClearPagePrivate2(page)) | |
247e743c CM |
1586 | return 0; |
1587 | ||
1588 | if (PageChecked(page)) | |
1589 | return -EAGAIN; | |
1590 | ||
1591 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
1592 | if (!fixup) | |
1593 | return -EAGAIN; | |
f421950f | 1594 | |
247e743c CM |
1595 | SetPageChecked(page); |
1596 | page_cache_get(page); | |
1597 | fixup->work.func = btrfs_writepage_fixup_worker; | |
1598 | fixup->page = page; | |
1599 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); | |
1600 | return -EAGAIN; | |
1601 | } | |
1602 | ||
d899e052 YZ |
1603 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
1604 | struct inode *inode, u64 file_pos, | |
1605 | u64 disk_bytenr, u64 disk_num_bytes, | |
1606 | u64 num_bytes, u64 ram_bytes, | |
1607 | u8 compression, u8 encryption, | |
1608 | u16 other_encoding, int extent_type) | |
1609 | { | |
1610 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1611 | struct btrfs_file_extent_item *fi; | |
1612 | struct btrfs_path *path; | |
1613 | struct extent_buffer *leaf; | |
1614 | struct btrfs_key ins; | |
1615 | u64 hint; | |
1616 | int ret; | |
1617 | ||
1618 | path = btrfs_alloc_path(); | |
1619 | BUG_ON(!path); | |
1620 | ||
b9473439 | 1621 | path->leave_spinning = 1; |
a1ed835e CM |
1622 | |
1623 | /* | |
1624 | * we may be replacing one extent in the tree with another. | |
1625 | * The new extent is pinned in the extent map, and we don't want | |
1626 | * to drop it from the cache until it is completely in the btree. | |
1627 | * | |
1628 | * So, tell btrfs_drop_extents to leave this extent in the cache. | |
1629 | * the caller is expected to unpin it and allow it to be merged | |
1630 | * with the others. | |
1631 | */ | |
920bbbfb YZ |
1632 | ret = btrfs_drop_extents(trans, inode, file_pos, file_pos + num_bytes, |
1633 | &hint, 0); | |
d899e052 YZ |
1634 | BUG_ON(ret); |
1635 | ||
1636 | ins.objectid = inode->i_ino; | |
1637 | ins.offset = file_pos; | |
1638 | ins.type = BTRFS_EXTENT_DATA_KEY; | |
1639 | ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi)); | |
1640 | BUG_ON(ret); | |
1641 | leaf = path->nodes[0]; | |
1642 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1643 | struct btrfs_file_extent_item); | |
1644 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); | |
1645 | btrfs_set_file_extent_type(leaf, fi, extent_type); | |
1646 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); | |
1647 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); | |
1648 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
1649 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
1650 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); | |
1651 | btrfs_set_file_extent_compression(leaf, fi, compression); | |
1652 | btrfs_set_file_extent_encryption(leaf, fi, encryption); | |
1653 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); | |
b9473439 CM |
1654 | |
1655 | btrfs_unlock_up_safe(path, 1); | |
1656 | btrfs_set_lock_blocking(leaf); | |
1657 | ||
d899e052 YZ |
1658 | btrfs_mark_buffer_dirty(leaf); |
1659 | ||
1660 | inode_add_bytes(inode, num_bytes); | |
d899e052 YZ |
1661 | |
1662 | ins.objectid = disk_bytenr; | |
1663 | ins.offset = disk_num_bytes; | |
1664 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 YZ |
1665 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
1666 | root->root_key.objectid, | |
1667 | inode->i_ino, file_pos, &ins); | |
d899e052 | 1668 | BUG_ON(ret); |
d899e052 | 1669 | btrfs_free_path(path); |
b9473439 | 1670 | |
d899e052 YZ |
1671 | return 0; |
1672 | } | |
1673 | ||
5d13a98f CM |
1674 | /* |
1675 | * helper function for btrfs_finish_ordered_io, this | |
1676 | * just reads in some of the csum leaves to prime them into ram | |
1677 | * before we start the transaction. It limits the amount of btree | |
1678 | * reads required while inside the transaction. | |
1679 | */ | |
d352ac68 CM |
1680 | /* as ordered data IO finishes, this gets called so we can finish |
1681 | * an ordered extent if the range of bytes in the file it covers are | |
1682 | * fully written. | |
1683 | */ | |
211f90e6 | 1684 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) |
e6dcd2dc | 1685 | { |
e6dcd2dc | 1686 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1687 | struct btrfs_trans_handle *trans = NULL; |
5d13a98f | 1688 | struct btrfs_ordered_extent *ordered_extent = NULL; |
e6dcd2dc | 1689 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2ac55d41 | 1690 | struct extent_state *cached_state = NULL; |
261507a0 | 1691 | int compress_type = 0; |
e6dcd2dc | 1692 | int ret; |
0cb59c99 | 1693 | bool nolock = false; |
e6dcd2dc | 1694 | |
5a1a3df1 JB |
1695 | ret = btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, |
1696 | end - start + 1); | |
ba1da2f4 | 1697 | if (!ret) |
e6dcd2dc | 1698 | return 0; |
e6dcd2dc | 1699 | BUG_ON(!ordered_extent); |
efd049fb | 1700 | |
0cb59c99 JB |
1701 | nolock = (root == root->fs_info->tree_root); |
1702 | ||
c2167754 YZ |
1703 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { |
1704 | BUG_ON(!list_empty(&ordered_extent->list)); | |
1705 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); | |
1706 | if (!ret) { | |
0cb59c99 JB |
1707 | if (nolock) |
1708 | trans = btrfs_join_transaction_nolock(root, 1); | |
1709 | else | |
1710 | trans = btrfs_join_transaction(root, 1); | |
3612b495 | 1711 | BUG_ON(IS_ERR(trans)); |
0ca1f7ce YZ |
1712 | btrfs_set_trans_block_group(trans, inode); |
1713 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; | |
c2167754 YZ |
1714 | ret = btrfs_update_inode(trans, root, inode); |
1715 | BUG_ON(ret); | |
c2167754 YZ |
1716 | } |
1717 | goto out; | |
1718 | } | |
e6dcd2dc | 1719 | |
2ac55d41 JB |
1720 | lock_extent_bits(io_tree, ordered_extent->file_offset, |
1721 | ordered_extent->file_offset + ordered_extent->len - 1, | |
1722 | 0, &cached_state, GFP_NOFS); | |
e6dcd2dc | 1723 | |
0cb59c99 JB |
1724 | if (nolock) |
1725 | trans = btrfs_join_transaction_nolock(root, 1); | |
1726 | else | |
1727 | trans = btrfs_join_transaction(root, 1); | |
3612b495 | 1728 | BUG_ON(IS_ERR(trans)); |
0ca1f7ce YZ |
1729 | btrfs_set_trans_block_group(trans, inode); |
1730 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; | |
c2167754 | 1731 | |
c8b97818 | 1732 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
261507a0 | 1733 | compress_type = ordered_extent->compress_type; |
d899e052 | 1734 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
261507a0 | 1735 | BUG_ON(compress_type); |
920bbbfb | 1736 | ret = btrfs_mark_extent_written(trans, inode, |
d899e052 YZ |
1737 | ordered_extent->file_offset, |
1738 | ordered_extent->file_offset + | |
1739 | ordered_extent->len); | |
1740 | BUG_ON(ret); | |
1741 | } else { | |
0af3d00b | 1742 | BUG_ON(root == root->fs_info->tree_root); |
d899e052 YZ |
1743 | ret = insert_reserved_file_extent(trans, inode, |
1744 | ordered_extent->file_offset, | |
1745 | ordered_extent->start, | |
1746 | ordered_extent->disk_len, | |
1747 | ordered_extent->len, | |
1748 | ordered_extent->len, | |
261507a0 | 1749 | compress_type, 0, 0, |
d899e052 | 1750 | BTRFS_FILE_EXTENT_REG); |
a1ed835e CM |
1751 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
1752 | ordered_extent->file_offset, | |
1753 | ordered_extent->len); | |
d899e052 YZ |
1754 | BUG_ON(ret); |
1755 | } | |
2ac55d41 JB |
1756 | unlock_extent_cached(io_tree, ordered_extent->file_offset, |
1757 | ordered_extent->file_offset + | |
1758 | ordered_extent->len - 1, &cached_state, GFP_NOFS); | |
1759 | ||
e6dcd2dc CM |
1760 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
1761 | &ordered_extent->list); | |
1762 | ||
c2167754 YZ |
1763 | btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
1764 | ret = btrfs_update_inode(trans, root, inode); | |
1765 | BUG_ON(ret); | |
c2167754 | 1766 | out: |
0cb59c99 JB |
1767 | if (nolock) { |
1768 | if (trans) | |
1769 | btrfs_end_transaction_nolock(trans, root); | |
1770 | } else { | |
1771 | btrfs_delalloc_release_metadata(inode, ordered_extent->len); | |
1772 | if (trans) | |
1773 | btrfs_end_transaction(trans, root); | |
1774 | } | |
1775 | ||
e6dcd2dc CM |
1776 | /* once for us */ |
1777 | btrfs_put_ordered_extent(ordered_extent); | |
1778 | /* once for the tree */ | |
1779 | btrfs_put_ordered_extent(ordered_extent); | |
1780 | ||
e6dcd2dc CM |
1781 | return 0; |
1782 | } | |
1783 | ||
b2950863 | 1784 | static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
211f90e6 CM |
1785 | struct extent_state *state, int uptodate) |
1786 | { | |
8b62b72b | 1787 | ClearPagePrivate2(page); |
211f90e6 CM |
1788 | return btrfs_finish_ordered_io(page->mapping->host, start, end); |
1789 | } | |
1790 | ||
d352ac68 CM |
1791 | /* |
1792 | * When IO fails, either with EIO or csum verification fails, we | |
1793 | * try other mirrors that might have a good copy of the data. This | |
1794 | * io_failure_record is used to record state as we go through all the | |
1795 | * mirrors. If another mirror has good data, the page is set up to date | |
1796 | * and things continue. If a good mirror can't be found, the original | |
1797 | * bio end_io callback is called to indicate things have failed. | |
1798 | */ | |
7e38326f CM |
1799 | struct io_failure_record { |
1800 | struct page *page; | |
1801 | u64 start; | |
1802 | u64 len; | |
1803 | u64 logical; | |
d20f7043 | 1804 | unsigned long bio_flags; |
7e38326f CM |
1805 | int last_mirror; |
1806 | }; | |
1807 | ||
b2950863 | 1808 | static int btrfs_io_failed_hook(struct bio *failed_bio, |
1259ab75 CM |
1809 | struct page *page, u64 start, u64 end, |
1810 | struct extent_state *state) | |
7e38326f CM |
1811 | { |
1812 | struct io_failure_record *failrec = NULL; | |
1813 | u64 private; | |
1814 | struct extent_map *em; | |
1815 | struct inode *inode = page->mapping->host; | |
1816 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
3b951516 | 1817 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7e38326f CM |
1818 | struct bio *bio; |
1819 | int num_copies; | |
1820 | int ret; | |
1259ab75 | 1821 | int rw; |
7e38326f CM |
1822 | u64 logical; |
1823 | ||
1824 | ret = get_state_private(failure_tree, start, &private); | |
1825 | if (ret) { | |
7e38326f CM |
1826 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
1827 | if (!failrec) | |
1828 | return -ENOMEM; | |
1829 | failrec->start = start; | |
1830 | failrec->len = end - start + 1; | |
1831 | failrec->last_mirror = 0; | |
d20f7043 | 1832 | failrec->bio_flags = 0; |
7e38326f | 1833 | |
890871be | 1834 | read_lock(&em_tree->lock); |
3b951516 CM |
1835 | em = lookup_extent_mapping(em_tree, start, failrec->len); |
1836 | if (em->start > start || em->start + em->len < start) { | |
1837 | free_extent_map(em); | |
1838 | em = NULL; | |
1839 | } | |
890871be | 1840 | read_unlock(&em_tree->lock); |
7e38326f CM |
1841 | |
1842 | if (!em || IS_ERR(em)) { | |
1843 | kfree(failrec); | |
1844 | return -EIO; | |
1845 | } | |
1846 | logical = start - em->start; | |
1847 | logical = em->block_start + logical; | |
d20f7043 CM |
1848 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
1849 | logical = em->block_start; | |
1850 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; | |
261507a0 LZ |
1851 | extent_set_compress_type(&failrec->bio_flags, |
1852 | em->compress_type); | |
d20f7043 | 1853 | } |
7e38326f CM |
1854 | failrec->logical = logical; |
1855 | free_extent_map(em); | |
1856 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
1857 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
1858 | set_state_private(failure_tree, start, |
1859 | (u64)(unsigned long)failrec); | |
7e38326f | 1860 | } else { |
587f7704 | 1861 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
1862 | } |
1863 | num_copies = btrfs_num_copies( | |
1864 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
1865 | failrec->logical, failrec->len); | |
1866 | failrec->last_mirror++; | |
1867 | if (!state) { | |
cad321ad | 1868 | spin_lock(&BTRFS_I(inode)->io_tree.lock); |
7e38326f CM |
1869 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, |
1870 | failrec->start, | |
1871 | EXTENT_LOCKED); | |
1872 | if (state && state->start != failrec->start) | |
1873 | state = NULL; | |
cad321ad | 1874 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); |
7e38326f CM |
1875 | } |
1876 | if (!state || failrec->last_mirror > num_copies) { | |
1877 | set_state_private(failure_tree, failrec->start, 0); | |
1878 | clear_extent_bits(failure_tree, failrec->start, | |
1879 | failrec->start + failrec->len - 1, | |
1880 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
1881 | kfree(failrec); | |
1882 | return -EIO; | |
1883 | } | |
1884 | bio = bio_alloc(GFP_NOFS, 1); | |
1885 | bio->bi_private = state; | |
1886 | bio->bi_end_io = failed_bio->bi_end_io; | |
1887 | bio->bi_sector = failrec->logical >> 9; | |
1888 | bio->bi_bdev = failed_bio->bi_bdev; | |
e1c4b745 | 1889 | bio->bi_size = 0; |
d20f7043 | 1890 | |
7e38326f | 1891 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
7b6d91da | 1892 | if (failed_bio->bi_rw & REQ_WRITE) |
1259ab75 CM |
1893 | rw = WRITE; |
1894 | else | |
1895 | rw = READ; | |
1896 | ||
1897 | BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio, | |
c8b97818 | 1898 | failrec->last_mirror, |
eaf25d93 | 1899 | failrec->bio_flags, 0); |
1259ab75 CM |
1900 | return 0; |
1901 | } | |
1902 | ||
d352ac68 CM |
1903 | /* |
1904 | * each time an IO finishes, we do a fast check in the IO failure tree | |
1905 | * to see if we need to process or clean up an io_failure_record | |
1906 | */ | |
b2950863 | 1907 | static int btrfs_clean_io_failures(struct inode *inode, u64 start) |
1259ab75 CM |
1908 | { |
1909 | u64 private; | |
1910 | u64 private_failure; | |
1911 | struct io_failure_record *failure; | |
1912 | int ret; | |
1913 | ||
1914 | private = 0; | |
1915 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
1916 | (u64)-1, 1, EXTENT_DIRTY)) { | |
1917 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
1918 | start, &private_failure); | |
1919 | if (ret == 0) { | |
1920 | failure = (struct io_failure_record *)(unsigned long) | |
1921 | private_failure; | |
1922 | set_state_private(&BTRFS_I(inode)->io_failure_tree, | |
1923 | failure->start, 0); | |
1924 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
1925 | failure->start, | |
1926 | failure->start + failure->len - 1, | |
1927 | EXTENT_DIRTY | EXTENT_LOCKED, | |
1928 | GFP_NOFS); | |
1929 | kfree(failure); | |
1930 | } | |
1931 | } | |
7e38326f CM |
1932 | return 0; |
1933 | } | |
1934 | ||
d352ac68 CM |
1935 | /* |
1936 | * when reads are done, we need to check csums to verify the data is correct | |
1937 | * if there's a match, we allow the bio to finish. If not, we go through | |
1938 | * the io_failure_record routines to find good copies | |
1939 | */ | |
b2950863 | 1940 | static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
70dec807 | 1941 | struct extent_state *state) |
07157aac | 1942 | { |
35ebb934 | 1943 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 1944 | struct inode *inode = page->mapping->host; |
d1310b2e | 1945 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 1946 | char *kaddr; |
aadfeb6e | 1947 | u64 private = ~(u32)0; |
07157aac | 1948 | int ret; |
ff79f819 CM |
1949 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1950 | u32 csum = ~(u32)0; | |
d1310b2e | 1951 | |
d20f7043 CM |
1952 | if (PageChecked(page)) { |
1953 | ClearPageChecked(page); | |
1954 | goto good; | |
1955 | } | |
6cbff00f CH |
1956 | |
1957 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) | |
17d217fe YZ |
1958 | return 0; |
1959 | ||
1960 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && | |
9655d298 | 1961 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) { |
17d217fe YZ |
1962 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
1963 | GFP_NOFS); | |
b6cda9bc | 1964 | return 0; |
17d217fe | 1965 | } |
d20f7043 | 1966 | |
c2e639f0 | 1967 | if (state && state->start == start) { |
70dec807 CM |
1968 | private = state->private; |
1969 | ret = 0; | |
1970 | } else { | |
1971 | ret = get_state_private(io_tree, start, &private); | |
1972 | } | |
9ab86c8e | 1973 | kaddr = kmap_atomic(page, KM_USER0); |
d397712b | 1974 | if (ret) |
07157aac | 1975 | goto zeroit; |
d397712b | 1976 | |
ff79f819 CM |
1977 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
1978 | btrfs_csum_final(csum, (char *)&csum); | |
d397712b | 1979 | if (csum != private) |
07157aac | 1980 | goto zeroit; |
d397712b | 1981 | |
9ab86c8e | 1982 | kunmap_atomic(kaddr, KM_USER0); |
d20f7043 | 1983 | good: |
7e38326f CM |
1984 | /* if the io failure tree for this inode is non-empty, |
1985 | * check to see if we've recovered from a failed IO | |
1986 | */ | |
1259ab75 | 1987 | btrfs_clean_io_failures(inode, start); |
07157aac CM |
1988 | return 0; |
1989 | ||
1990 | zeroit: | |
193f284d CM |
1991 | if (printk_ratelimit()) { |
1992 | printk(KERN_INFO "btrfs csum failed ino %lu off %llu csum %u " | |
1993 | "private %llu\n", page->mapping->host->i_ino, | |
1994 | (unsigned long long)start, csum, | |
1995 | (unsigned long long)private); | |
1996 | } | |
db94535d CM |
1997 | memset(kaddr + offset, 1, end - start + 1); |
1998 | flush_dcache_page(page); | |
9ab86c8e | 1999 | kunmap_atomic(kaddr, KM_USER0); |
3b951516 CM |
2000 | if (private == 0) |
2001 | return 0; | |
7e38326f | 2002 | return -EIO; |
07157aac | 2003 | } |
b888db2b | 2004 | |
24bbcf04 YZ |
2005 | struct delayed_iput { |
2006 | struct list_head list; | |
2007 | struct inode *inode; | |
2008 | }; | |
2009 | ||
2010 | void btrfs_add_delayed_iput(struct inode *inode) | |
2011 | { | |
2012 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2013 | struct delayed_iput *delayed; | |
2014 | ||
2015 | if (atomic_add_unless(&inode->i_count, -1, 1)) | |
2016 | return; | |
2017 | ||
2018 | delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL); | |
2019 | delayed->inode = inode; | |
2020 | ||
2021 | spin_lock(&fs_info->delayed_iput_lock); | |
2022 | list_add_tail(&delayed->list, &fs_info->delayed_iputs); | |
2023 | spin_unlock(&fs_info->delayed_iput_lock); | |
2024 | } | |
2025 | ||
2026 | void btrfs_run_delayed_iputs(struct btrfs_root *root) | |
2027 | { | |
2028 | LIST_HEAD(list); | |
2029 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2030 | struct delayed_iput *delayed; | |
2031 | int empty; | |
2032 | ||
2033 | spin_lock(&fs_info->delayed_iput_lock); | |
2034 | empty = list_empty(&fs_info->delayed_iputs); | |
2035 | spin_unlock(&fs_info->delayed_iput_lock); | |
2036 | if (empty) | |
2037 | return; | |
2038 | ||
2039 | down_read(&root->fs_info->cleanup_work_sem); | |
2040 | spin_lock(&fs_info->delayed_iput_lock); | |
2041 | list_splice_init(&fs_info->delayed_iputs, &list); | |
2042 | spin_unlock(&fs_info->delayed_iput_lock); | |
2043 | ||
2044 | while (!list_empty(&list)) { | |
2045 | delayed = list_entry(list.next, struct delayed_iput, list); | |
2046 | list_del(&delayed->list); | |
2047 | iput(delayed->inode); | |
2048 | kfree(delayed); | |
2049 | } | |
2050 | up_read(&root->fs_info->cleanup_work_sem); | |
2051 | } | |
2052 | ||
d68fc57b YZ |
2053 | /* |
2054 | * calculate extra metadata reservation when snapshotting a subvolume | |
2055 | * contains orphan files. | |
2056 | */ | |
2057 | void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans, | |
2058 | struct btrfs_pending_snapshot *pending, | |
2059 | u64 *bytes_to_reserve) | |
2060 | { | |
2061 | struct btrfs_root *root; | |
2062 | struct btrfs_block_rsv *block_rsv; | |
2063 | u64 num_bytes; | |
2064 | int index; | |
2065 | ||
2066 | root = pending->root; | |
2067 | if (!root->orphan_block_rsv || list_empty(&root->orphan_list)) | |
2068 | return; | |
2069 | ||
2070 | block_rsv = root->orphan_block_rsv; | |
2071 | ||
2072 | /* orphan block reservation for the snapshot */ | |
2073 | num_bytes = block_rsv->size; | |
2074 | ||
2075 | /* | |
2076 | * after the snapshot is created, COWing tree blocks may use more | |
2077 | * space than it frees. So we should make sure there is enough | |
2078 | * reserved space. | |
2079 | */ | |
2080 | index = trans->transid & 0x1; | |
2081 | if (block_rsv->reserved + block_rsv->freed[index] < block_rsv->size) { | |
2082 | num_bytes += block_rsv->size - | |
2083 | (block_rsv->reserved + block_rsv->freed[index]); | |
2084 | } | |
2085 | ||
2086 | *bytes_to_reserve += num_bytes; | |
2087 | } | |
2088 | ||
2089 | void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans, | |
2090 | struct btrfs_pending_snapshot *pending) | |
2091 | { | |
2092 | struct btrfs_root *root = pending->root; | |
2093 | struct btrfs_root *snap = pending->snap; | |
2094 | struct btrfs_block_rsv *block_rsv; | |
2095 | u64 num_bytes; | |
2096 | int index; | |
2097 | int ret; | |
2098 | ||
2099 | if (!root->orphan_block_rsv || list_empty(&root->orphan_list)) | |
2100 | return; | |
2101 | ||
2102 | /* refill source subvolume's orphan block reservation */ | |
2103 | block_rsv = root->orphan_block_rsv; | |
2104 | index = trans->transid & 0x1; | |
2105 | if (block_rsv->reserved + block_rsv->freed[index] < block_rsv->size) { | |
2106 | num_bytes = block_rsv->size - | |
2107 | (block_rsv->reserved + block_rsv->freed[index]); | |
2108 | ret = btrfs_block_rsv_migrate(&pending->block_rsv, | |
2109 | root->orphan_block_rsv, | |
2110 | num_bytes); | |
2111 | BUG_ON(ret); | |
2112 | } | |
2113 | ||
2114 | /* setup orphan block reservation for the snapshot */ | |
2115 | block_rsv = btrfs_alloc_block_rsv(snap); | |
2116 | BUG_ON(!block_rsv); | |
2117 | ||
2118 | btrfs_add_durable_block_rsv(root->fs_info, block_rsv); | |
2119 | snap->orphan_block_rsv = block_rsv; | |
2120 | ||
2121 | num_bytes = root->orphan_block_rsv->size; | |
2122 | ret = btrfs_block_rsv_migrate(&pending->block_rsv, | |
2123 | block_rsv, num_bytes); | |
2124 | BUG_ON(ret); | |
2125 | ||
2126 | #if 0 | |
2127 | /* insert orphan item for the snapshot */ | |
2128 | WARN_ON(!root->orphan_item_inserted); | |
2129 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, | |
2130 | snap->root_key.objectid); | |
2131 | BUG_ON(ret); | |
2132 | snap->orphan_item_inserted = 1; | |
2133 | #endif | |
2134 | } | |
2135 | ||
2136 | enum btrfs_orphan_cleanup_state { | |
2137 | ORPHAN_CLEANUP_STARTED = 1, | |
2138 | ORPHAN_CLEANUP_DONE = 2, | |
2139 | }; | |
2140 | ||
2141 | /* | |
2142 | * This is called in transaction commmit time. If there are no orphan | |
2143 | * files in the subvolume, it removes orphan item and frees block_rsv | |
2144 | * structure. | |
2145 | */ | |
2146 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, | |
2147 | struct btrfs_root *root) | |
2148 | { | |
2149 | int ret; | |
2150 | ||
2151 | if (!list_empty(&root->orphan_list) || | |
2152 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) | |
2153 | return; | |
2154 | ||
2155 | if (root->orphan_item_inserted && | |
2156 | btrfs_root_refs(&root->root_item) > 0) { | |
2157 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, | |
2158 | root->root_key.objectid); | |
2159 | BUG_ON(ret); | |
2160 | root->orphan_item_inserted = 0; | |
2161 | } | |
2162 | ||
2163 | if (root->orphan_block_rsv) { | |
2164 | WARN_ON(root->orphan_block_rsv->size > 0); | |
2165 | btrfs_free_block_rsv(root, root->orphan_block_rsv); | |
2166 | root->orphan_block_rsv = NULL; | |
2167 | } | |
2168 | } | |
2169 | ||
7b128766 JB |
2170 | /* |
2171 | * This creates an orphan entry for the given inode in case something goes | |
2172 | * wrong in the middle of an unlink/truncate. | |
d68fc57b YZ |
2173 | * |
2174 | * NOTE: caller of this function should reserve 5 units of metadata for | |
2175 | * this function. | |
7b128766 JB |
2176 | */ |
2177 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
2178 | { | |
2179 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
2180 | struct btrfs_block_rsv *block_rsv = NULL; |
2181 | int reserve = 0; | |
2182 | int insert = 0; | |
2183 | int ret; | |
7b128766 | 2184 | |
d68fc57b YZ |
2185 | if (!root->orphan_block_rsv) { |
2186 | block_rsv = btrfs_alloc_block_rsv(root); | |
2187 | BUG_ON(!block_rsv); | |
2188 | } | |
7b128766 | 2189 | |
d68fc57b YZ |
2190 | spin_lock(&root->orphan_lock); |
2191 | if (!root->orphan_block_rsv) { | |
2192 | root->orphan_block_rsv = block_rsv; | |
2193 | } else if (block_rsv) { | |
2194 | btrfs_free_block_rsv(root, block_rsv); | |
2195 | block_rsv = NULL; | |
7b128766 | 2196 | } |
7b128766 | 2197 | |
d68fc57b YZ |
2198 | if (list_empty(&BTRFS_I(inode)->i_orphan)) { |
2199 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); | |
2200 | #if 0 | |
2201 | /* | |
2202 | * For proper ENOSPC handling, we should do orphan | |
2203 | * cleanup when mounting. But this introduces backward | |
2204 | * compatibility issue. | |
2205 | */ | |
2206 | if (!xchg(&root->orphan_item_inserted, 1)) | |
2207 | insert = 2; | |
2208 | else | |
2209 | insert = 1; | |
2210 | #endif | |
2211 | insert = 1; | |
2212 | } else { | |
2213 | WARN_ON(!BTRFS_I(inode)->orphan_meta_reserved); | |
7b128766 JB |
2214 | } |
2215 | ||
d68fc57b YZ |
2216 | if (!BTRFS_I(inode)->orphan_meta_reserved) { |
2217 | BTRFS_I(inode)->orphan_meta_reserved = 1; | |
2218 | reserve = 1; | |
2219 | } | |
2220 | spin_unlock(&root->orphan_lock); | |
7b128766 | 2221 | |
d68fc57b YZ |
2222 | if (block_rsv) |
2223 | btrfs_add_durable_block_rsv(root->fs_info, block_rsv); | |
7b128766 | 2224 | |
d68fc57b YZ |
2225 | /* grab metadata reservation from transaction handle */ |
2226 | if (reserve) { | |
2227 | ret = btrfs_orphan_reserve_metadata(trans, inode); | |
2228 | BUG_ON(ret); | |
2229 | } | |
7b128766 | 2230 | |
d68fc57b YZ |
2231 | /* insert an orphan item to track this unlinked/truncated file */ |
2232 | if (insert >= 1) { | |
2233 | ret = btrfs_insert_orphan_item(trans, root, inode->i_ino); | |
2234 | BUG_ON(ret); | |
2235 | } | |
2236 | ||
2237 | /* insert an orphan item to track subvolume contains orphan files */ | |
2238 | if (insert >= 2) { | |
2239 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, | |
2240 | root->root_key.objectid); | |
2241 | BUG_ON(ret); | |
2242 | } | |
2243 | return 0; | |
7b128766 JB |
2244 | } |
2245 | ||
2246 | /* | |
2247 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
2248 | * item for this particular inode. | |
2249 | */ | |
2250 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) | |
2251 | { | |
2252 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
2253 | int delete_item = 0; |
2254 | int release_rsv = 0; | |
7b128766 JB |
2255 | int ret = 0; |
2256 | ||
d68fc57b YZ |
2257 | spin_lock(&root->orphan_lock); |
2258 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { | |
2259 | list_del_init(&BTRFS_I(inode)->i_orphan); | |
2260 | delete_item = 1; | |
7b128766 JB |
2261 | } |
2262 | ||
d68fc57b YZ |
2263 | if (BTRFS_I(inode)->orphan_meta_reserved) { |
2264 | BTRFS_I(inode)->orphan_meta_reserved = 0; | |
2265 | release_rsv = 1; | |
7b128766 | 2266 | } |
d68fc57b | 2267 | spin_unlock(&root->orphan_lock); |
7b128766 | 2268 | |
d68fc57b YZ |
2269 | if (trans && delete_item) { |
2270 | ret = btrfs_del_orphan_item(trans, root, inode->i_ino); | |
2271 | BUG_ON(ret); | |
2272 | } | |
7b128766 | 2273 | |
d68fc57b YZ |
2274 | if (release_rsv) |
2275 | btrfs_orphan_release_metadata(inode); | |
7b128766 | 2276 | |
d68fc57b | 2277 | return 0; |
7b128766 JB |
2278 | } |
2279 | ||
2280 | /* | |
2281 | * this cleans up any orphans that may be left on the list from the last use | |
2282 | * of this root. | |
2283 | */ | |
2284 | void btrfs_orphan_cleanup(struct btrfs_root *root) | |
2285 | { | |
2286 | struct btrfs_path *path; | |
2287 | struct extent_buffer *leaf; | |
7b128766 JB |
2288 | struct btrfs_key key, found_key; |
2289 | struct btrfs_trans_handle *trans; | |
2290 | struct inode *inode; | |
2291 | int ret = 0, nr_unlink = 0, nr_truncate = 0; | |
2292 | ||
d68fc57b | 2293 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
7b128766 | 2294 | return; |
c71bf099 YZ |
2295 | |
2296 | path = btrfs_alloc_path(); | |
2297 | BUG_ON(!path); | |
7b128766 JB |
2298 | path->reada = -1; |
2299 | ||
2300 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
2301 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
2302 | key.offset = (u64)-1; | |
2303 | ||
7b128766 JB |
2304 | while (1) { |
2305 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2306 | if (ret < 0) { | |
2307 | printk(KERN_ERR "Error searching slot for orphan: %d" | |
2308 | "\n", ret); | |
2309 | break; | |
2310 | } | |
2311 | ||
2312 | /* | |
2313 | * if ret == 0 means we found what we were searching for, which | |
2314 | * is weird, but possible, so only screw with path if we didnt | |
2315 | * find the key and see if we have stuff that matches | |
2316 | */ | |
2317 | if (ret > 0) { | |
2318 | if (path->slots[0] == 0) | |
2319 | break; | |
2320 | path->slots[0]--; | |
2321 | } | |
2322 | ||
2323 | /* pull out the item */ | |
2324 | leaf = path->nodes[0]; | |
7b128766 JB |
2325 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2326 | ||
2327 | /* make sure the item matches what we want */ | |
2328 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
2329 | break; | |
2330 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) | |
2331 | break; | |
2332 | ||
2333 | /* release the path since we're done with it */ | |
2334 | btrfs_release_path(root, path); | |
2335 | ||
2336 | /* | |
2337 | * this is where we are basically btrfs_lookup, without the | |
2338 | * crossing root thing. we store the inode number in the | |
2339 | * offset of the orphan item. | |
2340 | */ | |
5d4f98a2 YZ |
2341 | found_key.objectid = found_key.offset; |
2342 | found_key.type = BTRFS_INODE_ITEM_KEY; | |
2343 | found_key.offset = 0; | |
73f73415 | 2344 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
d68fc57b | 2345 | BUG_ON(IS_ERR(inode)); |
7b128766 | 2346 | |
7b128766 JB |
2347 | /* |
2348 | * add this inode to the orphan list so btrfs_orphan_del does | |
2349 | * the proper thing when we hit it | |
2350 | */ | |
d68fc57b | 2351 | spin_lock(&root->orphan_lock); |
7b128766 | 2352 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); |
d68fc57b | 2353 | spin_unlock(&root->orphan_lock); |
7b128766 JB |
2354 | |
2355 | /* | |
2356 | * if this is a bad inode, means we actually succeeded in | |
2357 | * removing the inode, but not the orphan record, which means | |
2358 | * we need to manually delete the orphan since iput will just | |
2359 | * do a destroy_inode | |
2360 | */ | |
2361 | if (is_bad_inode(inode)) { | |
a22285a6 | 2362 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 | 2363 | BUG_ON(IS_ERR(trans)); |
7b128766 | 2364 | btrfs_orphan_del(trans, inode); |
5b21f2ed | 2365 | btrfs_end_transaction(trans, root); |
7b128766 JB |
2366 | iput(inode); |
2367 | continue; | |
2368 | } | |
2369 | ||
2370 | /* if we have links, this was a truncate, lets do that */ | |
2371 | if (inode->i_nlink) { | |
2372 | nr_truncate++; | |
2373 | btrfs_truncate(inode); | |
2374 | } else { | |
2375 | nr_unlink++; | |
2376 | } | |
2377 | ||
2378 | /* this will do delete_inode and everything for us */ | |
2379 | iput(inode); | |
2380 | } | |
d68fc57b YZ |
2381 | btrfs_free_path(path); |
2382 | ||
2383 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; | |
2384 | ||
2385 | if (root->orphan_block_rsv) | |
2386 | btrfs_block_rsv_release(root, root->orphan_block_rsv, | |
2387 | (u64)-1); | |
2388 | ||
2389 | if (root->orphan_block_rsv || root->orphan_item_inserted) { | |
2390 | trans = btrfs_join_transaction(root, 1); | |
3612b495 | 2391 | BUG_ON(IS_ERR(trans)); |
d68fc57b YZ |
2392 | btrfs_end_transaction(trans, root); |
2393 | } | |
7b128766 JB |
2394 | |
2395 | if (nr_unlink) | |
2396 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); | |
2397 | if (nr_truncate) | |
2398 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); | |
7b128766 JB |
2399 | } |
2400 | ||
46a53cca CM |
2401 | /* |
2402 | * very simple check to peek ahead in the leaf looking for xattrs. If we | |
2403 | * don't find any xattrs, we know there can't be any acls. | |
2404 | * | |
2405 | * slot is the slot the inode is in, objectid is the objectid of the inode | |
2406 | */ | |
2407 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, | |
2408 | int slot, u64 objectid) | |
2409 | { | |
2410 | u32 nritems = btrfs_header_nritems(leaf); | |
2411 | struct btrfs_key found_key; | |
2412 | int scanned = 0; | |
2413 | ||
2414 | slot++; | |
2415 | while (slot < nritems) { | |
2416 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2417 | ||
2418 | /* we found a different objectid, there must not be acls */ | |
2419 | if (found_key.objectid != objectid) | |
2420 | return 0; | |
2421 | ||
2422 | /* we found an xattr, assume we've got an acl */ | |
2423 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) | |
2424 | return 1; | |
2425 | ||
2426 | /* | |
2427 | * we found a key greater than an xattr key, there can't | |
2428 | * be any acls later on | |
2429 | */ | |
2430 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) | |
2431 | return 0; | |
2432 | ||
2433 | slot++; | |
2434 | scanned++; | |
2435 | ||
2436 | /* | |
2437 | * it goes inode, inode backrefs, xattrs, extents, | |
2438 | * so if there are a ton of hard links to an inode there can | |
2439 | * be a lot of backrefs. Don't waste time searching too hard, | |
2440 | * this is just an optimization | |
2441 | */ | |
2442 | if (scanned >= 8) | |
2443 | break; | |
2444 | } | |
2445 | /* we hit the end of the leaf before we found an xattr or | |
2446 | * something larger than an xattr. We have to assume the inode | |
2447 | * has acls | |
2448 | */ | |
2449 | return 1; | |
2450 | } | |
2451 | ||
d352ac68 CM |
2452 | /* |
2453 | * read an inode from the btree into the in-memory inode | |
2454 | */ | |
5d4f98a2 | 2455 | static void btrfs_read_locked_inode(struct inode *inode) |
39279cc3 CM |
2456 | { |
2457 | struct btrfs_path *path; | |
5f39d397 | 2458 | struct extent_buffer *leaf; |
39279cc3 | 2459 | struct btrfs_inode_item *inode_item; |
0b86a832 | 2460 | struct btrfs_timespec *tspec; |
39279cc3 CM |
2461 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2462 | struct btrfs_key location; | |
46a53cca | 2463 | int maybe_acls; |
39279cc3 | 2464 | u64 alloc_group_block; |
618e21d5 | 2465 | u32 rdev; |
39279cc3 CM |
2466 | int ret; |
2467 | ||
2468 | path = btrfs_alloc_path(); | |
2469 | BUG_ON(!path); | |
39279cc3 | 2470 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 2471 | |
39279cc3 | 2472 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 2473 | if (ret) |
39279cc3 | 2474 | goto make_bad; |
39279cc3 | 2475 | |
5f39d397 CM |
2476 | leaf = path->nodes[0]; |
2477 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
2478 | struct btrfs_inode_item); | |
2479 | ||
2480 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
2481 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
2482 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
2483 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
dbe674a9 | 2484 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 CM |
2485 | |
2486 | tspec = btrfs_inode_atime(inode_item); | |
2487 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2488 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2489 | ||
2490 | tspec = btrfs_inode_mtime(inode_item); | |
2491 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2492 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2493 | ||
2494 | tspec = btrfs_inode_ctime(inode_item); | |
2495 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2496 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2497 | ||
a76a3cd4 | 2498 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
e02119d5 | 2499 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
c3027eb5 | 2500 | BTRFS_I(inode)->sequence = btrfs_inode_sequence(leaf, inode_item); |
e02119d5 | 2501 | inode->i_generation = BTRFS_I(inode)->generation; |
618e21d5 | 2502 | inode->i_rdev = 0; |
5f39d397 CM |
2503 | rdev = btrfs_inode_rdev(leaf, inode_item); |
2504 | ||
aec7477b | 2505 | BTRFS_I(inode)->index_cnt = (u64)-1; |
d2fb3437 | 2506 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
aec7477b | 2507 | |
5f39d397 | 2508 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); |
b4ce94de | 2509 | |
46a53cca CM |
2510 | /* |
2511 | * try to precache a NULL acl entry for files that don't have | |
2512 | * any xattrs or acls | |
2513 | */ | |
2514 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], inode->i_ino); | |
72c04902 AV |
2515 | if (!maybe_acls) |
2516 | cache_no_acl(inode); | |
46a53cca | 2517 | |
d2fb3437 YZ |
2518 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, 0, |
2519 | alloc_group_block, 0); | |
39279cc3 CM |
2520 | btrfs_free_path(path); |
2521 | inode_item = NULL; | |
2522 | ||
39279cc3 | 2523 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
2524 | case S_IFREG: |
2525 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 2526 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 2527 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2528 | inode->i_fop = &btrfs_file_operations; |
2529 | inode->i_op = &btrfs_file_inode_operations; | |
2530 | break; | |
2531 | case S_IFDIR: | |
2532 | inode->i_fop = &btrfs_dir_file_operations; | |
2533 | if (root == root->fs_info->tree_root) | |
2534 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
2535 | else | |
2536 | inode->i_op = &btrfs_dir_inode_operations; | |
2537 | break; | |
2538 | case S_IFLNK: | |
2539 | inode->i_op = &btrfs_symlink_inode_operations; | |
2540 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 2541 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 2542 | break; |
618e21d5 | 2543 | default: |
0279b4cd | 2544 | inode->i_op = &btrfs_special_inode_operations; |
618e21d5 JB |
2545 | init_special_inode(inode, inode->i_mode, rdev); |
2546 | break; | |
39279cc3 | 2547 | } |
6cbff00f CH |
2548 | |
2549 | btrfs_update_iflags(inode); | |
39279cc3 CM |
2550 | return; |
2551 | ||
2552 | make_bad: | |
39279cc3 | 2553 | btrfs_free_path(path); |
39279cc3 CM |
2554 | make_bad_inode(inode); |
2555 | } | |
2556 | ||
d352ac68 CM |
2557 | /* |
2558 | * given a leaf and an inode, copy the inode fields into the leaf | |
2559 | */ | |
e02119d5 CM |
2560 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
2561 | struct extent_buffer *leaf, | |
5f39d397 | 2562 | struct btrfs_inode_item *item, |
39279cc3 CM |
2563 | struct inode *inode) |
2564 | { | |
5f39d397 CM |
2565 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
2566 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
dbe674a9 | 2567 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
5f39d397 CM |
2568 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
2569 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
2570 | ||
2571 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
2572 | inode->i_atime.tv_sec); | |
2573 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
2574 | inode->i_atime.tv_nsec); | |
2575 | ||
2576 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
2577 | inode->i_mtime.tv_sec); | |
2578 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
2579 | inode->i_mtime.tv_nsec); | |
2580 | ||
2581 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
2582 | inode->i_ctime.tv_sec); | |
2583 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
2584 | inode->i_ctime.tv_nsec); | |
2585 | ||
a76a3cd4 | 2586 | btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode)); |
e02119d5 | 2587 | btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation); |
c3027eb5 | 2588 | btrfs_set_inode_sequence(leaf, item, BTRFS_I(inode)->sequence); |
e02119d5 | 2589 | btrfs_set_inode_transid(leaf, item, trans->transid); |
5f39d397 | 2590 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); |
b98b6767 | 2591 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
d2fb3437 | 2592 | btrfs_set_inode_block_group(leaf, item, BTRFS_I(inode)->block_group); |
39279cc3 CM |
2593 | } |
2594 | ||
d352ac68 CM |
2595 | /* |
2596 | * copy everything in the in-memory inode into the btree. | |
2597 | */ | |
d397712b CM |
2598 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, |
2599 | struct btrfs_root *root, struct inode *inode) | |
39279cc3 CM |
2600 | { |
2601 | struct btrfs_inode_item *inode_item; | |
2602 | struct btrfs_path *path; | |
5f39d397 | 2603 | struct extent_buffer *leaf; |
39279cc3 CM |
2604 | int ret; |
2605 | ||
2606 | path = btrfs_alloc_path(); | |
2607 | BUG_ON(!path); | |
b9473439 | 2608 | path->leave_spinning = 1; |
39279cc3 CM |
2609 | ret = btrfs_lookup_inode(trans, root, path, |
2610 | &BTRFS_I(inode)->location, 1); | |
2611 | if (ret) { | |
2612 | if (ret > 0) | |
2613 | ret = -ENOENT; | |
2614 | goto failed; | |
2615 | } | |
2616 | ||
b4ce94de | 2617 | btrfs_unlock_up_safe(path, 1); |
5f39d397 CM |
2618 | leaf = path->nodes[0]; |
2619 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
2620 | struct btrfs_inode_item); |
2621 | ||
e02119d5 | 2622 | fill_inode_item(trans, leaf, inode_item, inode); |
5f39d397 | 2623 | btrfs_mark_buffer_dirty(leaf); |
15ee9bc7 | 2624 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
2625 | ret = 0; |
2626 | failed: | |
39279cc3 CM |
2627 | btrfs_free_path(path); |
2628 | return ret; | |
2629 | } | |
2630 | ||
2631 | ||
d352ac68 CM |
2632 | /* |
2633 | * unlink helper that gets used here in inode.c and in the tree logging | |
2634 | * recovery code. It remove a link in a directory with a given name, and | |
2635 | * also drops the back refs in the inode to the directory | |
2636 | */ | |
e02119d5 CM |
2637 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
2638 | struct btrfs_root *root, | |
2639 | struct inode *dir, struct inode *inode, | |
2640 | const char *name, int name_len) | |
39279cc3 CM |
2641 | { |
2642 | struct btrfs_path *path; | |
39279cc3 | 2643 | int ret = 0; |
5f39d397 | 2644 | struct extent_buffer *leaf; |
39279cc3 | 2645 | struct btrfs_dir_item *di; |
5f39d397 | 2646 | struct btrfs_key key; |
aec7477b | 2647 | u64 index; |
39279cc3 CM |
2648 | |
2649 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
2650 | if (!path) { |
2651 | ret = -ENOMEM; | |
554233a6 | 2652 | goto out; |
54aa1f4d CM |
2653 | } |
2654 | ||
b9473439 | 2655 | path->leave_spinning = 1; |
39279cc3 CM |
2656 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
2657 | name, name_len, -1); | |
2658 | if (IS_ERR(di)) { | |
2659 | ret = PTR_ERR(di); | |
2660 | goto err; | |
2661 | } | |
2662 | if (!di) { | |
2663 | ret = -ENOENT; | |
2664 | goto err; | |
2665 | } | |
5f39d397 CM |
2666 | leaf = path->nodes[0]; |
2667 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 2668 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
2669 | if (ret) |
2670 | goto err; | |
39279cc3 CM |
2671 | btrfs_release_path(root, path); |
2672 | ||
aec7477b | 2673 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
e02119d5 CM |
2674 | inode->i_ino, |
2675 | dir->i_ino, &index); | |
aec7477b | 2676 | if (ret) { |
d397712b | 2677 | printk(KERN_INFO "btrfs failed to delete reference to %.*s, " |
aec7477b | 2678 | "inode %lu parent %lu\n", name_len, name, |
e02119d5 | 2679 | inode->i_ino, dir->i_ino); |
aec7477b JB |
2680 | goto err; |
2681 | } | |
2682 | ||
39279cc3 | 2683 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
aec7477b | 2684 | index, name, name_len, -1); |
39279cc3 CM |
2685 | if (IS_ERR(di)) { |
2686 | ret = PTR_ERR(di); | |
2687 | goto err; | |
2688 | } | |
2689 | if (!di) { | |
2690 | ret = -ENOENT; | |
2691 | goto err; | |
2692 | } | |
2693 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
925baedd | 2694 | btrfs_release_path(root, path); |
39279cc3 | 2695 | |
e02119d5 CM |
2696 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
2697 | inode, dir->i_ino); | |
49eb7e46 | 2698 | BUG_ON(ret != 0 && ret != -ENOENT); |
e02119d5 CM |
2699 | |
2700 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, | |
2701 | dir, index); | |
6418c961 CM |
2702 | if (ret == -ENOENT) |
2703 | ret = 0; | |
39279cc3 CM |
2704 | err: |
2705 | btrfs_free_path(path); | |
e02119d5 CM |
2706 | if (ret) |
2707 | goto out; | |
2708 | ||
2709 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
2710 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
2711 | btrfs_update_inode(trans, root, dir); | |
2712 | btrfs_drop_nlink(inode); | |
2713 | ret = btrfs_update_inode(trans, root, inode); | |
e02119d5 | 2714 | out: |
39279cc3 CM |
2715 | return ret; |
2716 | } | |
2717 | ||
a22285a6 YZ |
2718 | /* helper to check if there is any shared block in the path */ |
2719 | static int check_path_shared(struct btrfs_root *root, | |
2720 | struct btrfs_path *path) | |
39279cc3 | 2721 | { |
a22285a6 YZ |
2722 | struct extent_buffer *eb; |
2723 | int level; | |
0e4dcbef | 2724 | u64 refs = 1; |
5df6a9f6 | 2725 | |
a22285a6 | 2726 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { |
dedefd72 JB |
2727 | int ret; |
2728 | ||
a22285a6 YZ |
2729 | if (!path->nodes[level]) |
2730 | break; | |
2731 | eb = path->nodes[level]; | |
2732 | if (!btrfs_block_can_be_shared(root, eb)) | |
2733 | continue; | |
2734 | ret = btrfs_lookup_extent_info(NULL, root, eb->start, eb->len, | |
2735 | &refs, NULL); | |
2736 | if (refs > 1) | |
2737 | return 1; | |
5df6a9f6 | 2738 | } |
dedefd72 | 2739 | return 0; |
39279cc3 CM |
2740 | } |
2741 | ||
a22285a6 YZ |
2742 | /* |
2743 | * helper to start transaction for unlink and rmdir. | |
2744 | * | |
2745 | * unlink and rmdir are special in btrfs, they do not always free space. | |
2746 | * so in enospc case, we should make sure they will free space before | |
2747 | * allowing them to use the global metadata reservation. | |
2748 | */ | |
2749 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir, | |
2750 | struct dentry *dentry) | |
4df27c4d | 2751 | { |
39279cc3 | 2752 | struct btrfs_trans_handle *trans; |
a22285a6 | 2753 | struct btrfs_root *root = BTRFS_I(dir)->root; |
4df27c4d | 2754 | struct btrfs_path *path; |
a22285a6 | 2755 | struct btrfs_inode_ref *ref; |
4df27c4d | 2756 | struct btrfs_dir_item *di; |
7b128766 | 2757 | struct inode *inode = dentry->d_inode; |
4df27c4d | 2758 | u64 index; |
a22285a6 YZ |
2759 | int check_link = 1; |
2760 | int err = -ENOSPC; | |
4df27c4d YZ |
2761 | int ret; |
2762 | ||
a22285a6 YZ |
2763 | trans = btrfs_start_transaction(root, 10); |
2764 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) | |
2765 | return trans; | |
4df27c4d | 2766 | |
a22285a6 YZ |
2767 | if (inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
2768 | return ERR_PTR(-ENOSPC); | |
4df27c4d | 2769 | |
a22285a6 YZ |
2770 | /* check if there is someone else holds reference */ |
2771 | if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1) | |
2772 | return ERR_PTR(-ENOSPC); | |
4df27c4d | 2773 | |
a22285a6 YZ |
2774 | if (atomic_read(&inode->i_count) > 2) |
2775 | return ERR_PTR(-ENOSPC); | |
4df27c4d | 2776 | |
a22285a6 YZ |
2777 | if (xchg(&root->fs_info->enospc_unlink, 1)) |
2778 | return ERR_PTR(-ENOSPC); | |
2779 | ||
2780 | path = btrfs_alloc_path(); | |
2781 | if (!path) { | |
2782 | root->fs_info->enospc_unlink = 0; | |
2783 | return ERR_PTR(-ENOMEM); | |
4df27c4d YZ |
2784 | } |
2785 | ||
a22285a6 | 2786 | trans = btrfs_start_transaction(root, 0); |
5df6a9f6 | 2787 | if (IS_ERR(trans)) { |
a22285a6 YZ |
2788 | btrfs_free_path(path); |
2789 | root->fs_info->enospc_unlink = 0; | |
2790 | return trans; | |
2791 | } | |
4df27c4d | 2792 | |
a22285a6 YZ |
2793 | path->skip_locking = 1; |
2794 | path->search_commit_root = 1; | |
4df27c4d | 2795 | |
a22285a6 YZ |
2796 | ret = btrfs_lookup_inode(trans, root, path, |
2797 | &BTRFS_I(dir)->location, 0); | |
2798 | if (ret < 0) { | |
2799 | err = ret; | |
2800 | goto out; | |
2801 | } | |
2802 | if (ret == 0) { | |
2803 | if (check_path_shared(root, path)) | |
2804 | goto out; | |
2805 | } else { | |
2806 | check_link = 0; | |
5df6a9f6 | 2807 | } |
a22285a6 YZ |
2808 | btrfs_release_path(root, path); |
2809 | ||
2810 | ret = btrfs_lookup_inode(trans, root, path, | |
2811 | &BTRFS_I(inode)->location, 0); | |
2812 | if (ret < 0) { | |
2813 | err = ret; | |
2814 | goto out; | |
2815 | } | |
2816 | if (ret == 0) { | |
2817 | if (check_path_shared(root, path)) | |
2818 | goto out; | |
2819 | } else { | |
2820 | check_link = 0; | |
2821 | } | |
2822 | btrfs_release_path(root, path); | |
2823 | ||
2824 | if (ret == 0 && S_ISREG(inode->i_mode)) { | |
2825 | ret = btrfs_lookup_file_extent(trans, root, path, | |
2826 | inode->i_ino, (u64)-1, 0); | |
2827 | if (ret < 0) { | |
2828 | err = ret; | |
2829 | goto out; | |
2830 | } | |
2831 | BUG_ON(ret == 0); | |
2832 | if (check_path_shared(root, path)) | |
2833 | goto out; | |
2834 | btrfs_release_path(root, path); | |
2835 | } | |
2836 | ||
2837 | if (!check_link) { | |
2838 | err = 0; | |
2839 | goto out; | |
2840 | } | |
2841 | ||
2842 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, | |
2843 | dentry->d_name.name, dentry->d_name.len, 0); | |
2844 | if (IS_ERR(di)) { | |
2845 | err = PTR_ERR(di); | |
2846 | goto out; | |
2847 | } | |
2848 | if (di) { | |
2849 | if (check_path_shared(root, path)) | |
2850 | goto out; | |
2851 | } else { | |
2852 | err = 0; | |
2853 | goto out; | |
2854 | } | |
2855 | btrfs_release_path(root, path); | |
2856 | ||
2857 | ref = btrfs_lookup_inode_ref(trans, root, path, | |
2858 | dentry->d_name.name, dentry->d_name.len, | |
2859 | inode->i_ino, dir->i_ino, 0); | |
2860 | if (IS_ERR(ref)) { | |
2861 | err = PTR_ERR(ref); | |
2862 | goto out; | |
2863 | } | |
2864 | BUG_ON(!ref); | |
2865 | if (check_path_shared(root, path)) | |
2866 | goto out; | |
2867 | index = btrfs_inode_ref_index(path->nodes[0], ref); | |
2868 | btrfs_release_path(root, path); | |
2869 | ||
2870 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, index, | |
2871 | dentry->d_name.name, dentry->d_name.len, 0); | |
2872 | if (IS_ERR(di)) { | |
2873 | err = PTR_ERR(di); | |
2874 | goto out; | |
2875 | } | |
2876 | BUG_ON(ret == -ENOENT); | |
2877 | if (check_path_shared(root, path)) | |
2878 | goto out; | |
2879 | ||
2880 | err = 0; | |
2881 | out: | |
2882 | btrfs_free_path(path); | |
2883 | if (err) { | |
2884 | btrfs_end_transaction(trans, root); | |
2885 | root->fs_info->enospc_unlink = 0; | |
2886 | return ERR_PTR(err); | |
2887 | } | |
2888 | ||
2889 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
2890 | return trans; | |
2891 | } | |
2892 | ||
2893 | static void __unlink_end_trans(struct btrfs_trans_handle *trans, | |
2894 | struct btrfs_root *root) | |
2895 | { | |
2896 | if (trans->block_rsv == &root->fs_info->global_block_rsv) { | |
2897 | BUG_ON(!root->fs_info->enospc_unlink); | |
2898 | root->fs_info->enospc_unlink = 0; | |
2899 | } | |
2900 | btrfs_end_transaction_throttle(trans, root); | |
2901 | } | |
2902 | ||
2903 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
2904 | { | |
2905 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2906 | struct btrfs_trans_handle *trans; | |
2907 | struct inode *inode = dentry->d_inode; | |
2908 | int ret; | |
2909 | unsigned long nr = 0; | |
2910 | ||
2911 | trans = __unlink_start_trans(dir, dentry); | |
2912 | if (IS_ERR(trans)) | |
2913 | return PTR_ERR(trans); | |
5f39d397 | 2914 | |
39279cc3 | 2915 | btrfs_set_trans_block_group(trans, dir); |
12fcfd22 CM |
2916 | |
2917 | btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0); | |
2918 | ||
e02119d5 CM |
2919 | ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
2920 | dentry->d_name.name, dentry->d_name.len); | |
a22285a6 | 2921 | BUG_ON(ret); |
7b128766 | 2922 | |
a22285a6 | 2923 | if (inode->i_nlink == 0) { |
7b128766 | 2924 | ret = btrfs_orphan_add(trans, inode); |
a22285a6 YZ |
2925 | BUG_ON(ret); |
2926 | } | |
7b128766 | 2927 | |
d3c2fdcf | 2928 | nr = trans->blocks_used; |
a22285a6 | 2929 | __unlink_end_trans(trans, root); |
d3c2fdcf | 2930 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2931 | return ret; |
2932 | } | |
2933 | ||
4df27c4d YZ |
2934 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
2935 | struct btrfs_root *root, | |
2936 | struct inode *dir, u64 objectid, | |
2937 | const char *name, int name_len) | |
2938 | { | |
2939 | struct btrfs_path *path; | |
2940 | struct extent_buffer *leaf; | |
2941 | struct btrfs_dir_item *di; | |
2942 | struct btrfs_key key; | |
2943 | u64 index; | |
2944 | int ret; | |
2945 | ||
2946 | path = btrfs_alloc_path(); | |
2947 | if (!path) | |
2948 | return -ENOMEM; | |
2949 | ||
2950 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, | |
2951 | name, name_len, -1); | |
2952 | BUG_ON(!di || IS_ERR(di)); | |
2953 | ||
2954 | leaf = path->nodes[0]; | |
2955 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
2956 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); | |
2957 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
2958 | BUG_ON(ret); | |
2959 | btrfs_release_path(root, path); | |
2960 | ||
2961 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
2962 | objectid, root->root_key.objectid, | |
2963 | dir->i_ino, &index, name, name_len); | |
2964 | if (ret < 0) { | |
2965 | BUG_ON(ret != -ENOENT); | |
2966 | di = btrfs_search_dir_index_item(root, path, dir->i_ino, | |
2967 | name, name_len); | |
2968 | BUG_ON(!di || IS_ERR(di)); | |
2969 | ||
2970 | leaf = path->nodes[0]; | |
2971 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
2972 | btrfs_release_path(root, path); | |
2973 | index = key.offset; | |
2974 | } | |
2975 | ||
2976 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
2977 | index, name, name_len, -1); | |
2978 | BUG_ON(!di || IS_ERR(di)); | |
2979 | ||
2980 | leaf = path->nodes[0]; | |
2981 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
2982 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); | |
2983 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
2984 | BUG_ON(ret); | |
2985 | btrfs_release_path(root, path); | |
2986 | ||
2987 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
2988 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
2989 | ret = btrfs_update_inode(trans, root, dir); | |
2990 | BUG_ON(ret); | |
4df27c4d YZ |
2991 | |
2992 | btrfs_free_path(path); | |
2993 | return 0; | |
2994 | } | |
2995 | ||
39279cc3 CM |
2996 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
2997 | { | |
2998 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 2999 | int err = 0; |
39279cc3 | 3000 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 | 3001 | struct btrfs_trans_handle *trans; |
1832a6d5 | 3002 | unsigned long nr = 0; |
39279cc3 | 3003 | |
3394e160 | 3004 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE || |
4df27c4d | 3005 | inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) |
134d4512 Y |
3006 | return -ENOTEMPTY; |
3007 | ||
a22285a6 YZ |
3008 | trans = __unlink_start_trans(dir, dentry); |
3009 | if (IS_ERR(trans)) | |
5df6a9f6 | 3010 | return PTR_ERR(trans); |
5df6a9f6 | 3011 | |
39279cc3 | 3012 | btrfs_set_trans_block_group(trans, dir); |
39279cc3 | 3013 | |
4df27c4d YZ |
3014 | if (unlikely(inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
3015 | err = btrfs_unlink_subvol(trans, root, dir, | |
3016 | BTRFS_I(inode)->location.objectid, | |
3017 | dentry->d_name.name, | |
3018 | dentry->d_name.len); | |
3019 | goto out; | |
3020 | } | |
3021 | ||
7b128766 JB |
3022 | err = btrfs_orphan_add(trans, inode); |
3023 | if (err) | |
4df27c4d | 3024 | goto out; |
7b128766 | 3025 | |
39279cc3 | 3026 | /* now the directory is empty */ |
e02119d5 CM |
3027 | err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
3028 | dentry->d_name.name, dentry->d_name.len); | |
d397712b | 3029 | if (!err) |
dbe674a9 | 3030 | btrfs_i_size_write(inode, 0); |
4df27c4d | 3031 | out: |
d3c2fdcf | 3032 | nr = trans->blocks_used; |
a22285a6 | 3033 | __unlink_end_trans(trans, root); |
d3c2fdcf | 3034 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 3035 | |
39279cc3 CM |
3036 | return err; |
3037 | } | |
3038 | ||
d20f7043 | 3039 | #if 0 |
323ac95b CM |
3040 | /* |
3041 | * when truncating bytes in a file, it is possible to avoid reading | |
3042 | * the leaves that contain only checksum items. This can be the | |
3043 | * majority of the IO required to delete a large file, but it must | |
3044 | * be done carefully. | |
3045 | * | |
3046 | * The keys in the level just above the leaves are checked to make sure | |
3047 | * the lowest key in a given leaf is a csum key, and starts at an offset | |
3048 | * after the new size. | |
3049 | * | |
3050 | * Then the key for the next leaf is checked to make sure it also has | |
3051 | * a checksum item for the same file. If it does, we know our target leaf | |
3052 | * contains only checksum items, and it can be safely freed without reading | |
3053 | * it. | |
3054 | * | |
3055 | * This is just an optimization targeted at large files. It may do | |
3056 | * nothing. It will return 0 unless things went badly. | |
3057 | */ | |
3058 | static noinline int drop_csum_leaves(struct btrfs_trans_handle *trans, | |
3059 | struct btrfs_root *root, | |
3060 | struct btrfs_path *path, | |
3061 | struct inode *inode, u64 new_size) | |
3062 | { | |
3063 | struct btrfs_key key; | |
3064 | int ret; | |
3065 | int nritems; | |
3066 | struct btrfs_key found_key; | |
3067 | struct btrfs_key other_key; | |
5b84e8d6 YZ |
3068 | struct btrfs_leaf_ref *ref; |
3069 | u64 leaf_gen; | |
3070 | u64 leaf_start; | |
323ac95b CM |
3071 | |
3072 | path->lowest_level = 1; | |
3073 | key.objectid = inode->i_ino; | |
3074 | key.type = BTRFS_CSUM_ITEM_KEY; | |
3075 | key.offset = new_size; | |
3076 | again: | |
3077 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
3078 | if (ret < 0) | |
3079 | goto out; | |
3080 | ||
3081 | if (path->nodes[1] == NULL) { | |
3082 | ret = 0; | |
3083 | goto out; | |
3084 | } | |
3085 | ret = 0; | |
3086 | btrfs_node_key_to_cpu(path->nodes[1], &found_key, path->slots[1]); | |
3087 | nritems = btrfs_header_nritems(path->nodes[1]); | |
3088 | ||
3089 | if (!nritems) | |
3090 | goto out; | |
3091 | ||
3092 | if (path->slots[1] >= nritems) | |
3093 | goto next_node; | |
3094 | ||
3095 | /* did we find a key greater than anything we want to delete? */ | |
3096 | if (found_key.objectid > inode->i_ino || | |
3097 | (found_key.objectid == inode->i_ino && found_key.type > key.type)) | |
3098 | goto out; | |
3099 | ||
3100 | /* we check the next key in the node to make sure the leave contains | |
3101 | * only checksum items. This comparison doesn't work if our | |
3102 | * leaf is the last one in the node | |
3103 | */ | |
3104 | if (path->slots[1] + 1 >= nritems) { | |
3105 | next_node: | |
3106 | /* search forward from the last key in the node, this | |
3107 | * will bring us into the next node in the tree | |
3108 | */ | |
3109 | btrfs_node_key_to_cpu(path->nodes[1], &found_key, nritems - 1); | |
3110 | ||
3111 | /* unlikely, but we inc below, so check to be safe */ | |
3112 | if (found_key.offset == (u64)-1) | |
3113 | goto out; | |
3114 | ||
3115 | /* search_forward needs a path with locks held, do the | |
3116 | * search again for the original key. It is possible | |
3117 | * this will race with a balance and return a path that | |
3118 | * we could modify, but this drop is just an optimization | |
3119 | * and is allowed to miss some leaves. | |
3120 | */ | |
3121 | btrfs_release_path(root, path); | |
3122 | found_key.offset++; | |
3123 | ||
3124 | /* setup a max key for search_forward */ | |
3125 | other_key.offset = (u64)-1; | |
3126 | other_key.type = key.type; | |
3127 | other_key.objectid = key.objectid; | |
3128 | ||
3129 | path->keep_locks = 1; | |
3130 | ret = btrfs_search_forward(root, &found_key, &other_key, | |
3131 | path, 0, 0); | |
3132 | path->keep_locks = 0; | |
3133 | if (ret || found_key.objectid != key.objectid || | |
3134 | found_key.type != key.type) { | |
3135 | ret = 0; | |
3136 | goto out; | |
3137 | } | |
3138 | ||
3139 | key.offset = found_key.offset; | |
3140 | btrfs_release_path(root, path); | |
3141 | cond_resched(); | |
3142 | goto again; | |
3143 | } | |
3144 | ||
3145 | /* we know there's one more slot after us in the tree, | |
3146 | * read that key so we can verify it is also a checksum item | |
3147 | */ | |
3148 | btrfs_node_key_to_cpu(path->nodes[1], &other_key, path->slots[1] + 1); | |
3149 | ||
3150 | if (found_key.objectid < inode->i_ino) | |
3151 | goto next_key; | |
3152 | ||
3153 | if (found_key.type != key.type || found_key.offset < new_size) | |
3154 | goto next_key; | |
3155 | ||
3156 | /* | |
3157 | * if the key for the next leaf isn't a csum key from this objectid, | |
3158 | * we can't be sure there aren't good items inside this leaf. | |
3159 | * Bail out | |
3160 | */ | |
3161 | if (other_key.objectid != inode->i_ino || other_key.type != key.type) | |
3162 | goto out; | |
3163 | ||
5b84e8d6 YZ |
3164 | leaf_start = btrfs_node_blockptr(path->nodes[1], path->slots[1]); |
3165 | leaf_gen = btrfs_node_ptr_generation(path->nodes[1], path->slots[1]); | |
323ac95b CM |
3166 | /* |
3167 | * it is safe to delete this leaf, it contains only | |
3168 | * csum items from this inode at an offset >= new_size | |
3169 | */ | |
5b84e8d6 | 3170 | ret = btrfs_del_leaf(trans, root, path, leaf_start); |
323ac95b CM |
3171 | BUG_ON(ret); |
3172 | ||
5b84e8d6 YZ |
3173 | if (root->ref_cows && leaf_gen < trans->transid) { |
3174 | ref = btrfs_alloc_leaf_ref(root, 0); | |
3175 | if (ref) { | |
3176 | ref->root_gen = root->root_key.offset; | |
3177 | ref->bytenr = leaf_start; | |
3178 | ref->owner = 0; | |
3179 | ref->generation = leaf_gen; | |
3180 | ref->nritems = 0; | |
3181 | ||
bd56b302 CM |
3182 | btrfs_sort_leaf_ref(ref); |
3183 | ||
5b84e8d6 YZ |
3184 | ret = btrfs_add_leaf_ref(root, ref, 0); |
3185 | WARN_ON(ret); | |
3186 | btrfs_free_leaf_ref(root, ref); | |
3187 | } else { | |
3188 | WARN_ON(1); | |
3189 | } | |
3190 | } | |
323ac95b CM |
3191 | next_key: |
3192 | btrfs_release_path(root, path); | |
3193 | ||
3194 | if (other_key.objectid == inode->i_ino && | |
3195 | other_key.type == key.type && other_key.offset > key.offset) { | |
3196 | key.offset = other_key.offset; | |
3197 | cond_resched(); | |
3198 | goto again; | |
3199 | } | |
3200 | ret = 0; | |
3201 | out: | |
3202 | /* fixup any changes we've made to the path */ | |
3203 | path->lowest_level = 0; | |
3204 | path->keep_locks = 0; | |
3205 | btrfs_release_path(root, path); | |
3206 | return ret; | |
3207 | } | |
3208 | ||
d20f7043 CM |
3209 | #endif |
3210 | ||
39279cc3 CM |
3211 | /* |
3212 | * this can truncate away extent items, csum items and directory items. | |
3213 | * It starts at a high offset and removes keys until it can't find | |
d352ac68 | 3214 | * any higher than new_size |
39279cc3 CM |
3215 | * |
3216 | * csum items that cross the new i_size are truncated to the new size | |
3217 | * as well. | |
7b128766 JB |
3218 | * |
3219 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
3220 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 | 3221 | */ |
8082510e YZ |
3222 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
3223 | struct btrfs_root *root, | |
3224 | struct inode *inode, | |
3225 | u64 new_size, u32 min_type) | |
39279cc3 | 3226 | { |
39279cc3 | 3227 | struct btrfs_path *path; |
5f39d397 | 3228 | struct extent_buffer *leaf; |
39279cc3 | 3229 | struct btrfs_file_extent_item *fi; |
8082510e YZ |
3230 | struct btrfs_key key; |
3231 | struct btrfs_key found_key; | |
39279cc3 | 3232 | u64 extent_start = 0; |
db94535d | 3233 | u64 extent_num_bytes = 0; |
5d4f98a2 | 3234 | u64 extent_offset = 0; |
39279cc3 | 3235 | u64 item_end = 0; |
8082510e YZ |
3236 | u64 mask = root->sectorsize - 1; |
3237 | u32 found_type = (u8)-1; | |
39279cc3 CM |
3238 | int found_extent; |
3239 | int del_item; | |
85e21bac CM |
3240 | int pending_del_nr = 0; |
3241 | int pending_del_slot = 0; | |
179e29e4 | 3242 | int extent_type = -1; |
771ed689 | 3243 | int encoding; |
8082510e YZ |
3244 | int ret; |
3245 | int err = 0; | |
3246 | ||
3247 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 3248 | |
0af3d00b | 3249 | if (root->ref_cows || root == root->fs_info->tree_root) |
5b21f2ed | 3250 | btrfs_drop_extent_cache(inode, new_size & (~mask), (u64)-1, 0); |
8082510e | 3251 | |
39279cc3 CM |
3252 | path = btrfs_alloc_path(); |
3253 | BUG_ON(!path); | |
33c17ad5 | 3254 | path->reada = -1; |
5f39d397 | 3255 | |
39279cc3 CM |
3256 | key.objectid = inode->i_ino; |
3257 | key.offset = (u64)-1; | |
5f39d397 CM |
3258 | key.type = (u8)-1; |
3259 | ||
85e21bac | 3260 | search_again: |
b9473439 | 3261 | path->leave_spinning = 1; |
85e21bac | 3262 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
8082510e YZ |
3263 | if (ret < 0) { |
3264 | err = ret; | |
3265 | goto out; | |
3266 | } | |
d397712b | 3267 | |
85e21bac | 3268 | if (ret > 0) { |
e02119d5 CM |
3269 | /* there are no items in the tree for us to truncate, we're |
3270 | * done | |
3271 | */ | |
8082510e YZ |
3272 | if (path->slots[0] == 0) |
3273 | goto out; | |
85e21bac CM |
3274 | path->slots[0]--; |
3275 | } | |
3276 | ||
d397712b | 3277 | while (1) { |
39279cc3 | 3278 | fi = NULL; |
5f39d397 CM |
3279 | leaf = path->nodes[0]; |
3280 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
3281 | found_type = btrfs_key_type(&found_key); | |
771ed689 | 3282 | encoding = 0; |
39279cc3 | 3283 | |
5f39d397 | 3284 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 3285 | break; |
5f39d397 | 3286 | |
85e21bac | 3287 | if (found_type < min_type) |
39279cc3 CM |
3288 | break; |
3289 | ||
5f39d397 | 3290 | item_end = found_key.offset; |
39279cc3 | 3291 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 3292 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 3293 | struct btrfs_file_extent_item); |
179e29e4 | 3294 | extent_type = btrfs_file_extent_type(leaf, fi); |
771ed689 CM |
3295 | encoding = btrfs_file_extent_compression(leaf, fi); |
3296 | encoding |= btrfs_file_extent_encryption(leaf, fi); | |
3297 | encoding |= btrfs_file_extent_other_encoding(leaf, fi); | |
3298 | ||
179e29e4 | 3299 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
5f39d397 | 3300 | item_end += |
db94535d | 3301 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 | 3302 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
179e29e4 | 3303 | item_end += btrfs_file_extent_inline_len(leaf, |
c8b97818 | 3304 | fi); |
39279cc3 | 3305 | } |
008630c1 | 3306 | item_end--; |
39279cc3 | 3307 | } |
8082510e YZ |
3308 | if (found_type > min_type) { |
3309 | del_item = 1; | |
3310 | } else { | |
3311 | if (item_end < new_size) | |
b888db2b | 3312 | break; |
8082510e YZ |
3313 | if (found_key.offset >= new_size) |
3314 | del_item = 1; | |
3315 | else | |
3316 | del_item = 0; | |
39279cc3 | 3317 | } |
39279cc3 | 3318 | found_extent = 0; |
39279cc3 | 3319 | /* FIXME, shrink the extent if the ref count is only 1 */ |
179e29e4 CM |
3320 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
3321 | goto delete; | |
3322 | ||
3323 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 3324 | u64 num_dec; |
db94535d | 3325 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
771ed689 | 3326 | if (!del_item && !encoding) { |
db94535d CM |
3327 | u64 orig_num_bytes = |
3328 | btrfs_file_extent_num_bytes(leaf, fi); | |
e02119d5 | 3329 | extent_num_bytes = new_size - |
5f39d397 | 3330 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
3331 | extent_num_bytes = extent_num_bytes & |
3332 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
3333 | btrfs_set_file_extent_num_bytes(leaf, fi, |
3334 | extent_num_bytes); | |
3335 | num_dec = (orig_num_bytes - | |
9069218d | 3336 | extent_num_bytes); |
e02119d5 | 3337 | if (root->ref_cows && extent_start != 0) |
a76a3cd4 | 3338 | inode_sub_bytes(inode, num_dec); |
5f39d397 | 3339 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 3340 | } else { |
db94535d CM |
3341 | extent_num_bytes = |
3342 | btrfs_file_extent_disk_num_bytes(leaf, | |
3343 | fi); | |
5d4f98a2 YZ |
3344 | extent_offset = found_key.offset - |
3345 | btrfs_file_extent_offset(leaf, fi); | |
3346 | ||
39279cc3 | 3347 | /* FIXME blocksize != 4096 */ |
9069218d | 3348 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
3349 | if (extent_start != 0) { |
3350 | found_extent = 1; | |
e02119d5 | 3351 | if (root->ref_cows) |
a76a3cd4 | 3352 | inode_sub_bytes(inode, num_dec); |
e02119d5 | 3353 | } |
39279cc3 | 3354 | } |
9069218d | 3355 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
c8b97818 CM |
3356 | /* |
3357 | * we can't truncate inline items that have had | |
3358 | * special encodings | |
3359 | */ | |
3360 | if (!del_item && | |
3361 | btrfs_file_extent_compression(leaf, fi) == 0 && | |
3362 | btrfs_file_extent_encryption(leaf, fi) == 0 && | |
3363 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { | |
e02119d5 CM |
3364 | u32 size = new_size - found_key.offset; |
3365 | ||
3366 | if (root->ref_cows) { | |
a76a3cd4 YZ |
3367 | inode_sub_bytes(inode, item_end + 1 - |
3368 | new_size); | |
e02119d5 CM |
3369 | } |
3370 | size = | |
3371 | btrfs_file_extent_calc_inline_size(size); | |
9069218d | 3372 | ret = btrfs_truncate_item(trans, root, path, |
e02119d5 | 3373 | size, 1); |
9069218d | 3374 | BUG_ON(ret); |
e02119d5 | 3375 | } else if (root->ref_cows) { |
a76a3cd4 YZ |
3376 | inode_sub_bytes(inode, item_end + 1 - |
3377 | found_key.offset); | |
9069218d | 3378 | } |
39279cc3 | 3379 | } |
179e29e4 | 3380 | delete: |
39279cc3 | 3381 | if (del_item) { |
85e21bac CM |
3382 | if (!pending_del_nr) { |
3383 | /* no pending yet, add ourselves */ | |
3384 | pending_del_slot = path->slots[0]; | |
3385 | pending_del_nr = 1; | |
3386 | } else if (pending_del_nr && | |
3387 | path->slots[0] + 1 == pending_del_slot) { | |
3388 | /* hop on the pending chunk */ | |
3389 | pending_del_nr++; | |
3390 | pending_del_slot = path->slots[0]; | |
3391 | } else { | |
d397712b | 3392 | BUG(); |
85e21bac | 3393 | } |
39279cc3 CM |
3394 | } else { |
3395 | break; | |
3396 | } | |
0af3d00b JB |
3397 | if (found_extent && (root->ref_cows || |
3398 | root == root->fs_info->tree_root)) { | |
b9473439 | 3399 | btrfs_set_path_blocking(path); |
39279cc3 | 3400 | ret = btrfs_free_extent(trans, root, extent_start, |
5d4f98a2 YZ |
3401 | extent_num_bytes, 0, |
3402 | btrfs_header_owner(leaf), | |
3403 | inode->i_ino, extent_offset); | |
39279cc3 CM |
3404 | BUG_ON(ret); |
3405 | } | |
85e21bac | 3406 | |
8082510e YZ |
3407 | if (found_type == BTRFS_INODE_ITEM_KEY) |
3408 | break; | |
3409 | ||
3410 | if (path->slots[0] == 0 || | |
3411 | path->slots[0] != pending_del_slot) { | |
3412 | if (root->ref_cows) { | |
3413 | err = -EAGAIN; | |
3414 | goto out; | |
3415 | } | |
3416 | if (pending_del_nr) { | |
3417 | ret = btrfs_del_items(trans, root, path, | |
3418 | pending_del_slot, | |
3419 | pending_del_nr); | |
3420 | BUG_ON(ret); | |
3421 | pending_del_nr = 0; | |
3422 | } | |
85e21bac CM |
3423 | btrfs_release_path(root, path); |
3424 | goto search_again; | |
8082510e YZ |
3425 | } else { |
3426 | path->slots[0]--; | |
85e21bac | 3427 | } |
39279cc3 | 3428 | } |
8082510e | 3429 | out: |
85e21bac CM |
3430 | if (pending_del_nr) { |
3431 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
3432 | pending_del_nr); | |
d68fc57b | 3433 | BUG_ON(ret); |
85e21bac | 3434 | } |
39279cc3 | 3435 | btrfs_free_path(path); |
8082510e | 3436 | return err; |
39279cc3 CM |
3437 | } |
3438 | ||
3439 | /* | |
3440 | * taken from block_truncate_page, but does cow as it zeros out | |
3441 | * any bytes left in the last page in the file. | |
3442 | */ | |
3443 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
3444 | { | |
3445 | struct inode *inode = mapping->host; | |
db94535d | 3446 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
3447 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
3448 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 3449 | struct extent_state *cached_state = NULL; |
e6dcd2dc | 3450 | char *kaddr; |
db94535d | 3451 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
3452 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
3453 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
3454 | struct page *page; | |
39279cc3 | 3455 | int ret = 0; |
a52d9a80 | 3456 | u64 page_start; |
e6dcd2dc | 3457 | u64 page_end; |
39279cc3 CM |
3458 | |
3459 | if ((offset & (blocksize - 1)) == 0) | |
3460 | goto out; | |
0ca1f7ce | 3461 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
5d5e103a JB |
3462 | if (ret) |
3463 | goto out; | |
39279cc3 CM |
3464 | |
3465 | ret = -ENOMEM; | |
211c17f5 | 3466 | again: |
39279cc3 | 3467 | page = grab_cache_page(mapping, index); |
5d5e103a | 3468 | if (!page) { |
0ca1f7ce | 3469 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
39279cc3 | 3470 | goto out; |
5d5e103a | 3471 | } |
e6dcd2dc CM |
3472 | |
3473 | page_start = page_offset(page); | |
3474 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
3475 | ||
39279cc3 | 3476 | if (!PageUptodate(page)) { |
9ebefb18 | 3477 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 3478 | lock_page(page); |
211c17f5 CM |
3479 | if (page->mapping != mapping) { |
3480 | unlock_page(page); | |
3481 | page_cache_release(page); | |
3482 | goto again; | |
3483 | } | |
39279cc3 CM |
3484 | if (!PageUptodate(page)) { |
3485 | ret = -EIO; | |
89642229 | 3486 | goto out_unlock; |
39279cc3 CM |
3487 | } |
3488 | } | |
211c17f5 | 3489 | wait_on_page_writeback(page); |
e6dcd2dc | 3490 | |
2ac55d41 JB |
3491 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state, |
3492 | GFP_NOFS); | |
e6dcd2dc CM |
3493 | set_page_extent_mapped(page); |
3494 | ||
3495 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
3496 | if (ordered) { | |
2ac55d41 JB |
3497 | unlock_extent_cached(io_tree, page_start, page_end, |
3498 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
3499 | unlock_page(page); |
3500 | page_cache_release(page); | |
eb84ae03 | 3501 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
3502 | btrfs_put_ordered_extent(ordered); |
3503 | goto again; | |
3504 | } | |
3505 | ||
2ac55d41 | 3506 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
5d5e103a | 3507 | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
2ac55d41 | 3508 | 0, 0, &cached_state, GFP_NOFS); |
5d5e103a | 3509 | |
2ac55d41 JB |
3510 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
3511 | &cached_state); | |
9ed74f2d | 3512 | if (ret) { |
2ac55d41 JB |
3513 | unlock_extent_cached(io_tree, page_start, page_end, |
3514 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
3515 | goto out_unlock; |
3516 | } | |
3517 | ||
e6dcd2dc CM |
3518 | ret = 0; |
3519 | if (offset != PAGE_CACHE_SIZE) { | |
3520 | kaddr = kmap(page); | |
3521 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
3522 | flush_dcache_page(page); | |
3523 | kunmap(page); | |
3524 | } | |
247e743c | 3525 | ClearPageChecked(page); |
e6dcd2dc | 3526 | set_page_dirty(page); |
2ac55d41 JB |
3527 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
3528 | GFP_NOFS); | |
39279cc3 | 3529 | |
89642229 | 3530 | out_unlock: |
5d5e103a | 3531 | if (ret) |
0ca1f7ce | 3532 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
39279cc3 CM |
3533 | unlock_page(page); |
3534 | page_cache_release(page); | |
3535 | out: | |
3536 | return ret; | |
3537 | } | |
3538 | ||
9036c102 | 3539 | int btrfs_cont_expand(struct inode *inode, loff_t size) |
39279cc3 | 3540 | { |
9036c102 YZ |
3541 | struct btrfs_trans_handle *trans; |
3542 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3543 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
a22285a6 | 3544 | struct extent_map *em = NULL; |
2ac55d41 | 3545 | struct extent_state *cached_state = NULL; |
9036c102 YZ |
3546 | u64 mask = root->sectorsize - 1; |
3547 | u64 hole_start = (inode->i_size + mask) & ~mask; | |
3548 | u64 block_end = (size + mask) & ~mask; | |
3549 | u64 last_byte; | |
3550 | u64 cur_offset; | |
3551 | u64 hole_size; | |
9ed74f2d | 3552 | int err = 0; |
39279cc3 | 3553 | |
9036c102 YZ |
3554 | if (size <= hole_start) |
3555 | return 0; | |
3556 | ||
9036c102 YZ |
3557 | while (1) { |
3558 | struct btrfs_ordered_extent *ordered; | |
3559 | btrfs_wait_ordered_range(inode, hole_start, | |
3560 | block_end - hole_start); | |
2ac55d41 JB |
3561 | lock_extent_bits(io_tree, hole_start, block_end - 1, 0, |
3562 | &cached_state, GFP_NOFS); | |
9036c102 YZ |
3563 | ordered = btrfs_lookup_ordered_extent(inode, hole_start); |
3564 | if (!ordered) | |
3565 | break; | |
2ac55d41 JB |
3566 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
3567 | &cached_state, GFP_NOFS); | |
9036c102 YZ |
3568 | btrfs_put_ordered_extent(ordered); |
3569 | } | |
39279cc3 | 3570 | |
9036c102 YZ |
3571 | cur_offset = hole_start; |
3572 | while (1) { | |
3573 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, | |
3574 | block_end - cur_offset, 0); | |
3575 | BUG_ON(IS_ERR(em) || !em); | |
3576 | last_byte = min(extent_map_end(em), block_end); | |
3577 | last_byte = (last_byte + mask) & ~mask; | |
8082510e | 3578 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
771ed689 | 3579 | u64 hint_byte = 0; |
9036c102 | 3580 | hole_size = last_byte - cur_offset; |
9ed74f2d | 3581 | |
a22285a6 YZ |
3582 | trans = btrfs_start_transaction(root, 2); |
3583 | if (IS_ERR(trans)) { | |
3584 | err = PTR_ERR(trans); | |
9ed74f2d | 3585 | break; |
a22285a6 | 3586 | } |
8082510e YZ |
3587 | btrfs_set_trans_block_group(trans, inode); |
3588 | ||
3589 | err = btrfs_drop_extents(trans, inode, cur_offset, | |
3590 | cur_offset + hole_size, | |
3591 | &hint_byte, 1); | |
3592 | BUG_ON(err); | |
3593 | ||
9036c102 YZ |
3594 | err = btrfs_insert_file_extent(trans, root, |
3595 | inode->i_ino, cur_offset, 0, | |
3596 | 0, hole_size, 0, hole_size, | |
3597 | 0, 0, 0); | |
8082510e YZ |
3598 | BUG_ON(err); |
3599 | ||
9036c102 YZ |
3600 | btrfs_drop_extent_cache(inode, hole_start, |
3601 | last_byte - 1, 0); | |
8082510e YZ |
3602 | |
3603 | btrfs_end_transaction(trans, root); | |
9036c102 YZ |
3604 | } |
3605 | free_extent_map(em); | |
a22285a6 | 3606 | em = NULL; |
9036c102 | 3607 | cur_offset = last_byte; |
8082510e | 3608 | if (cur_offset >= block_end) |
9036c102 YZ |
3609 | break; |
3610 | } | |
1832a6d5 | 3611 | |
a22285a6 | 3612 | free_extent_map(em); |
2ac55d41 JB |
3613 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
3614 | GFP_NOFS); | |
9036c102 YZ |
3615 | return err; |
3616 | } | |
39279cc3 | 3617 | |
8082510e YZ |
3618 | static int btrfs_setattr_size(struct inode *inode, struct iattr *attr) |
3619 | { | |
3620 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3621 | struct btrfs_trans_handle *trans; | |
3622 | unsigned long nr; | |
3623 | int ret; | |
3624 | ||
3625 | if (attr->ia_size == inode->i_size) | |
3626 | return 0; | |
3627 | ||
3628 | if (attr->ia_size > inode->i_size) { | |
3629 | unsigned long limit; | |
3630 | limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
3631 | if (attr->ia_size > inode->i_sb->s_maxbytes) | |
3632 | return -EFBIG; | |
3633 | if (limit != RLIM_INFINITY && attr->ia_size > limit) { | |
3634 | send_sig(SIGXFSZ, current, 0); | |
3635 | return -EFBIG; | |
3636 | } | |
3637 | } | |
3638 | ||
d68fc57b YZ |
3639 | trans = btrfs_start_transaction(root, 5); |
3640 | if (IS_ERR(trans)) | |
3641 | return PTR_ERR(trans); | |
8082510e | 3642 | |
8082510e YZ |
3643 | btrfs_set_trans_block_group(trans, inode); |
3644 | ||
3645 | ret = btrfs_orphan_add(trans, inode); | |
3646 | BUG_ON(ret); | |
3647 | ||
3648 | nr = trans->blocks_used; | |
3649 | btrfs_end_transaction(trans, root); | |
8082510e YZ |
3650 | btrfs_btree_balance_dirty(root, nr); |
3651 | ||
3652 | if (attr->ia_size > inode->i_size) { | |
3653 | ret = btrfs_cont_expand(inode, attr->ia_size); | |
3654 | if (ret) { | |
3655 | btrfs_truncate(inode); | |
3656 | return ret; | |
3657 | } | |
3658 | ||
3659 | i_size_write(inode, attr->ia_size); | |
3660 | btrfs_ordered_update_i_size(inode, inode->i_size, NULL); | |
3661 | ||
d68fc57b YZ |
3662 | trans = btrfs_start_transaction(root, 0); |
3663 | BUG_ON(IS_ERR(trans)); | |
8082510e | 3664 | btrfs_set_trans_block_group(trans, inode); |
d68fc57b YZ |
3665 | trans->block_rsv = root->orphan_block_rsv; |
3666 | BUG_ON(!trans->block_rsv); | |
8082510e YZ |
3667 | |
3668 | ret = btrfs_update_inode(trans, root, inode); | |
3669 | BUG_ON(ret); | |
3670 | if (inode->i_nlink > 0) { | |
3671 | ret = btrfs_orphan_del(trans, inode); | |
3672 | BUG_ON(ret); | |
3673 | } | |
3674 | nr = trans->blocks_used; | |
3675 | btrfs_end_transaction(trans, root); | |
3676 | btrfs_btree_balance_dirty(root, nr); | |
3677 | return 0; | |
3678 | } | |
3679 | ||
3680 | /* | |
3681 | * We're truncating a file that used to have good data down to | |
3682 | * zero. Make sure it gets into the ordered flush list so that | |
3683 | * any new writes get down to disk quickly. | |
3684 | */ | |
3685 | if (attr->ia_size == 0) | |
3686 | BTRFS_I(inode)->ordered_data_close = 1; | |
3687 | ||
3688 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ | |
3689 | ret = vmtruncate(inode, attr->ia_size); | |
3690 | BUG_ON(ret); | |
3691 | ||
3692 | return 0; | |
3693 | } | |
3694 | ||
9036c102 YZ |
3695 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
3696 | { | |
3697 | struct inode *inode = dentry->d_inode; | |
b83cc969 | 3698 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9036c102 | 3699 | int err; |
39279cc3 | 3700 | |
b83cc969 LZ |
3701 | if (btrfs_root_readonly(root)) |
3702 | return -EROFS; | |
3703 | ||
9036c102 YZ |
3704 | err = inode_change_ok(inode, attr); |
3705 | if (err) | |
3706 | return err; | |
2bf5a725 | 3707 | |
5a3f23d5 | 3708 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
8082510e YZ |
3709 | err = btrfs_setattr_size(inode, attr); |
3710 | if (err) | |
3711 | return err; | |
39279cc3 | 3712 | } |
9036c102 | 3713 | |
1025774c CH |
3714 | if (attr->ia_valid) { |
3715 | setattr_copy(inode, attr); | |
3716 | mark_inode_dirty(inode); | |
3717 | ||
3718 | if (attr->ia_valid & ATTR_MODE) | |
3719 | err = btrfs_acl_chmod(inode); | |
3720 | } | |
33268eaf | 3721 | |
39279cc3 CM |
3722 | return err; |
3723 | } | |
61295eb8 | 3724 | |
bd555975 | 3725 | void btrfs_evict_inode(struct inode *inode) |
39279cc3 CM |
3726 | { |
3727 | struct btrfs_trans_handle *trans; | |
3728 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 3729 | unsigned long nr; |
39279cc3 CM |
3730 | int ret; |
3731 | ||
3732 | truncate_inode_pages(&inode->i_data, 0); | |
0af3d00b JB |
3733 | if (inode->i_nlink && (btrfs_root_refs(&root->root_item) != 0 || |
3734 | root == root->fs_info->tree_root)) | |
bd555975 AV |
3735 | goto no_delete; |
3736 | ||
39279cc3 | 3737 | if (is_bad_inode(inode)) { |
7b128766 | 3738 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
3739 | goto no_delete; |
3740 | } | |
bd555975 | 3741 | /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */ |
4a096752 | 3742 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
5f39d397 | 3743 | |
c71bf099 YZ |
3744 | if (root->fs_info->log_root_recovering) { |
3745 | BUG_ON(!list_empty(&BTRFS_I(inode)->i_orphan)); | |
3746 | goto no_delete; | |
3747 | } | |
3748 | ||
76dda93c YZ |
3749 | if (inode->i_nlink > 0) { |
3750 | BUG_ON(btrfs_root_refs(&root->root_item) != 0); | |
3751 | goto no_delete; | |
3752 | } | |
3753 | ||
dbe674a9 | 3754 | btrfs_i_size_write(inode, 0); |
5f39d397 | 3755 | |
8082510e | 3756 | while (1) { |
d68fc57b YZ |
3757 | trans = btrfs_start_transaction(root, 0); |
3758 | BUG_ON(IS_ERR(trans)); | |
8082510e | 3759 | btrfs_set_trans_block_group(trans, inode); |
d68fc57b YZ |
3760 | trans->block_rsv = root->orphan_block_rsv; |
3761 | ||
3762 | ret = btrfs_block_rsv_check(trans, root, | |
3763 | root->orphan_block_rsv, 0, 5); | |
3764 | if (ret) { | |
3765 | BUG_ON(ret != -EAGAIN); | |
3766 | ret = btrfs_commit_transaction(trans, root); | |
3767 | BUG_ON(ret); | |
3768 | continue; | |
3769 | } | |
7b128766 | 3770 | |
d68fc57b | 3771 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
8082510e YZ |
3772 | if (ret != -EAGAIN) |
3773 | break; | |
85e21bac | 3774 | |
8082510e YZ |
3775 | nr = trans->blocks_used; |
3776 | btrfs_end_transaction(trans, root); | |
3777 | trans = NULL; | |
3778 | btrfs_btree_balance_dirty(root, nr); | |
d68fc57b | 3779 | |
8082510e | 3780 | } |
5f39d397 | 3781 | |
8082510e YZ |
3782 | if (ret == 0) { |
3783 | ret = btrfs_orphan_del(trans, inode); | |
3784 | BUG_ON(ret); | |
3785 | } | |
54aa1f4d | 3786 | |
d3c2fdcf | 3787 | nr = trans->blocks_used; |
54aa1f4d | 3788 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 3789 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 3790 | no_delete: |
bd555975 | 3791 | end_writeback(inode); |
8082510e | 3792 | return; |
39279cc3 CM |
3793 | } |
3794 | ||
3795 | /* | |
3796 | * this returns the key found in the dir entry in the location pointer. | |
3797 | * If no dir entries were found, location->objectid is 0. | |
3798 | */ | |
3799 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
3800 | struct btrfs_key *location) | |
3801 | { | |
3802 | const char *name = dentry->d_name.name; | |
3803 | int namelen = dentry->d_name.len; | |
3804 | struct btrfs_dir_item *di; | |
3805 | struct btrfs_path *path; | |
3806 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 3807 | int ret = 0; |
39279cc3 CM |
3808 | |
3809 | path = btrfs_alloc_path(); | |
3810 | BUG_ON(!path); | |
3954401f | 3811 | |
39279cc3 CM |
3812 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
3813 | namelen, 0); | |
0d9f7f3e Y |
3814 | if (IS_ERR(di)) |
3815 | ret = PTR_ERR(di); | |
d397712b CM |
3816 | |
3817 | if (!di || IS_ERR(di)) | |
3954401f | 3818 | goto out_err; |
d397712b | 3819 | |
5f39d397 | 3820 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 3821 | out: |
39279cc3 CM |
3822 | btrfs_free_path(path); |
3823 | return ret; | |
3954401f CM |
3824 | out_err: |
3825 | location->objectid = 0; | |
3826 | goto out; | |
39279cc3 CM |
3827 | } |
3828 | ||
3829 | /* | |
3830 | * when we hit a tree root in a directory, the btrfs part of the inode | |
3831 | * needs to be changed to reflect the root directory of the tree root. This | |
3832 | * is kind of like crossing a mount point. | |
3833 | */ | |
3834 | static int fixup_tree_root_location(struct btrfs_root *root, | |
4df27c4d YZ |
3835 | struct inode *dir, |
3836 | struct dentry *dentry, | |
3837 | struct btrfs_key *location, | |
3838 | struct btrfs_root **sub_root) | |
39279cc3 | 3839 | { |
4df27c4d YZ |
3840 | struct btrfs_path *path; |
3841 | struct btrfs_root *new_root; | |
3842 | struct btrfs_root_ref *ref; | |
3843 | struct extent_buffer *leaf; | |
3844 | int ret; | |
3845 | int err = 0; | |
39279cc3 | 3846 | |
4df27c4d YZ |
3847 | path = btrfs_alloc_path(); |
3848 | if (!path) { | |
3849 | err = -ENOMEM; | |
3850 | goto out; | |
3851 | } | |
39279cc3 | 3852 | |
4df27c4d YZ |
3853 | err = -ENOENT; |
3854 | ret = btrfs_find_root_ref(root->fs_info->tree_root, path, | |
3855 | BTRFS_I(dir)->root->root_key.objectid, | |
3856 | location->objectid); | |
3857 | if (ret) { | |
3858 | if (ret < 0) | |
3859 | err = ret; | |
3860 | goto out; | |
3861 | } | |
39279cc3 | 3862 | |
4df27c4d YZ |
3863 | leaf = path->nodes[0]; |
3864 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); | |
3865 | if (btrfs_root_ref_dirid(leaf, ref) != dir->i_ino || | |
3866 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) | |
3867 | goto out; | |
39279cc3 | 3868 | |
4df27c4d YZ |
3869 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
3870 | (unsigned long)(ref + 1), | |
3871 | dentry->d_name.len); | |
3872 | if (ret) | |
3873 | goto out; | |
3874 | ||
3875 | btrfs_release_path(root->fs_info->tree_root, path); | |
3876 | ||
3877 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); | |
3878 | if (IS_ERR(new_root)) { | |
3879 | err = PTR_ERR(new_root); | |
3880 | goto out; | |
3881 | } | |
3882 | ||
3883 | if (btrfs_root_refs(&new_root->root_item) == 0) { | |
3884 | err = -ENOENT; | |
3885 | goto out; | |
3886 | } | |
3887 | ||
3888 | *sub_root = new_root; | |
3889 | location->objectid = btrfs_root_dirid(&new_root->root_item); | |
3890 | location->type = BTRFS_INODE_ITEM_KEY; | |
3891 | location->offset = 0; | |
3892 | err = 0; | |
3893 | out: | |
3894 | btrfs_free_path(path); | |
3895 | return err; | |
39279cc3 CM |
3896 | } |
3897 | ||
5d4f98a2 YZ |
3898 | static void inode_tree_add(struct inode *inode) |
3899 | { | |
3900 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3901 | struct btrfs_inode *entry; | |
03e860bd FNP |
3902 | struct rb_node **p; |
3903 | struct rb_node *parent; | |
03e860bd FNP |
3904 | again: |
3905 | p = &root->inode_tree.rb_node; | |
3906 | parent = NULL; | |
5d4f98a2 | 3907 | |
1d3382cb | 3908 | if (inode_unhashed(inode)) |
76dda93c YZ |
3909 | return; |
3910 | ||
5d4f98a2 YZ |
3911 | spin_lock(&root->inode_lock); |
3912 | while (*p) { | |
3913 | parent = *p; | |
3914 | entry = rb_entry(parent, struct btrfs_inode, rb_node); | |
3915 | ||
3916 | if (inode->i_ino < entry->vfs_inode.i_ino) | |
03e860bd | 3917 | p = &parent->rb_left; |
5d4f98a2 | 3918 | else if (inode->i_ino > entry->vfs_inode.i_ino) |
03e860bd | 3919 | p = &parent->rb_right; |
5d4f98a2 YZ |
3920 | else { |
3921 | WARN_ON(!(entry->vfs_inode.i_state & | |
a4ffdde6 | 3922 | (I_WILL_FREE | I_FREEING))); |
03e860bd FNP |
3923 | rb_erase(parent, &root->inode_tree); |
3924 | RB_CLEAR_NODE(parent); | |
3925 | spin_unlock(&root->inode_lock); | |
3926 | goto again; | |
5d4f98a2 YZ |
3927 | } |
3928 | } | |
3929 | rb_link_node(&BTRFS_I(inode)->rb_node, parent, p); | |
3930 | rb_insert_color(&BTRFS_I(inode)->rb_node, &root->inode_tree); | |
3931 | spin_unlock(&root->inode_lock); | |
3932 | } | |
3933 | ||
3934 | static void inode_tree_del(struct inode *inode) | |
3935 | { | |
3936 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
76dda93c | 3937 | int empty = 0; |
5d4f98a2 | 3938 | |
03e860bd | 3939 | spin_lock(&root->inode_lock); |
5d4f98a2 | 3940 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
5d4f98a2 | 3941 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
5d4f98a2 | 3942 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
76dda93c | 3943 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
5d4f98a2 | 3944 | } |
03e860bd | 3945 | spin_unlock(&root->inode_lock); |
76dda93c | 3946 | |
0af3d00b JB |
3947 | /* |
3948 | * Free space cache has inodes in the tree root, but the tree root has a | |
3949 | * root_refs of 0, so this could end up dropping the tree root as a | |
3950 | * snapshot, so we need the extra !root->fs_info->tree_root check to | |
3951 | * make sure we don't drop it. | |
3952 | */ | |
3953 | if (empty && btrfs_root_refs(&root->root_item) == 0 && | |
3954 | root != root->fs_info->tree_root) { | |
76dda93c YZ |
3955 | synchronize_srcu(&root->fs_info->subvol_srcu); |
3956 | spin_lock(&root->inode_lock); | |
3957 | empty = RB_EMPTY_ROOT(&root->inode_tree); | |
3958 | spin_unlock(&root->inode_lock); | |
3959 | if (empty) | |
3960 | btrfs_add_dead_root(root); | |
3961 | } | |
3962 | } | |
3963 | ||
3964 | int btrfs_invalidate_inodes(struct btrfs_root *root) | |
3965 | { | |
3966 | struct rb_node *node; | |
3967 | struct rb_node *prev; | |
3968 | struct btrfs_inode *entry; | |
3969 | struct inode *inode; | |
3970 | u64 objectid = 0; | |
3971 | ||
3972 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); | |
3973 | ||
3974 | spin_lock(&root->inode_lock); | |
3975 | again: | |
3976 | node = root->inode_tree.rb_node; | |
3977 | prev = NULL; | |
3978 | while (node) { | |
3979 | prev = node; | |
3980 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
3981 | ||
3982 | if (objectid < entry->vfs_inode.i_ino) | |
3983 | node = node->rb_left; | |
3984 | else if (objectid > entry->vfs_inode.i_ino) | |
3985 | node = node->rb_right; | |
3986 | else | |
3987 | break; | |
3988 | } | |
3989 | if (!node) { | |
3990 | while (prev) { | |
3991 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
3992 | if (objectid <= entry->vfs_inode.i_ino) { | |
3993 | node = prev; | |
3994 | break; | |
3995 | } | |
3996 | prev = rb_next(prev); | |
3997 | } | |
3998 | } | |
3999 | while (node) { | |
4000 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
4001 | objectid = entry->vfs_inode.i_ino + 1; | |
4002 | inode = igrab(&entry->vfs_inode); | |
4003 | if (inode) { | |
4004 | spin_unlock(&root->inode_lock); | |
4005 | if (atomic_read(&inode->i_count) > 1) | |
4006 | d_prune_aliases(inode); | |
4007 | /* | |
45321ac5 | 4008 | * btrfs_drop_inode will have it removed from |
76dda93c YZ |
4009 | * the inode cache when its usage count |
4010 | * hits zero. | |
4011 | */ | |
4012 | iput(inode); | |
4013 | cond_resched(); | |
4014 | spin_lock(&root->inode_lock); | |
4015 | goto again; | |
4016 | } | |
4017 | ||
4018 | if (cond_resched_lock(&root->inode_lock)) | |
4019 | goto again; | |
4020 | ||
4021 | node = rb_next(node); | |
4022 | } | |
4023 | spin_unlock(&root->inode_lock); | |
4024 | return 0; | |
5d4f98a2 YZ |
4025 | } |
4026 | ||
e02119d5 CM |
4027 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
4028 | { | |
4029 | struct btrfs_iget_args *args = p; | |
4030 | inode->i_ino = args->ino; | |
e02119d5 | 4031 | BTRFS_I(inode)->root = args->root; |
6a63209f | 4032 | btrfs_set_inode_space_info(args->root, inode); |
39279cc3 CM |
4033 | return 0; |
4034 | } | |
4035 | ||
4036 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
4037 | { | |
4038 | struct btrfs_iget_args *args = opaque; | |
d397712b CM |
4039 | return args->ino == inode->i_ino && |
4040 | args->root == BTRFS_I(inode)->root; | |
39279cc3 CM |
4041 | } |
4042 | ||
5d4f98a2 YZ |
4043 | static struct inode *btrfs_iget_locked(struct super_block *s, |
4044 | u64 objectid, | |
4045 | struct btrfs_root *root) | |
39279cc3 CM |
4046 | { |
4047 | struct inode *inode; | |
4048 | struct btrfs_iget_args args; | |
4049 | args.ino = objectid; | |
4050 | args.root = root; | |
4051 | ||
4052 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
4053 | btrfs_init_locked_inode, | |
4054 | (void *)&args); | |
4055 | return inode; | |
4056 | } | |
4057 | ||
1a54ef8c BR |
4058 | /* Get an inode object given its location and corresponding root. |
4059 | * Returns in *is_new if the inode was read from disk | |
4060 | */ | |
4061 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
73f73415 | 4062 | struct btrfs_root *root, int *new) |
1a54ef8c BR |
4063 | { |
4064 | struct inode *inode; | |
4065 | ||
4066 | inode = btrfs_iget_locked(s, location->objectid, root); | |
4067 | if (!inode) | |
5d4f98a2 | 4068 | return ERR_PTR(-ENOMEM); |
1a54ef8c BR |
4069 | |
4070 | if (inode->i_state & I_NEW) { | |
4071 | BTRFS_I(inode)->root = root; | |
4072 | memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); | |
4073 | btrfs_read_locked_inode(inode); | |
5d4f98a2 YZ |
4074 | |
4075 | inode_tree_add(inode); | |
1a54ef8c | 4076 | unlock_new_inode(inode); |
73f73415 JB |
4077 | if (new) |
4078 | *new = 1; | |
1a54ef8c BR |
4079 | } |
4080 | ||
4081 | return inode; | |
4082 | } | |
4083 | ||
4df27c4d YZ |
4084 | static struct inode *new_simple_dir(struct super_block *s, |
4085 | struct btrfs_key *key, | |
4086 | struct btrfs_root *root) | |
4087 | { | |
4088 | struct inode *inode = new_inode(s); | |
4089 | ||
4090 | if (!inode) | |
4091 | return ERR_PTR(-ENOMEM); | |
4092 | ||
4df27c4d YZ |
4093 | BTRFS_I(inode)->root = root; |
4094 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); | |
4095 | BTRFS_I(inode)->dummy_inode = 1; | |
4096 | ||
4097 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; | |
4098 | inode->i_op = &simple_dir_inode_operations; | |
4099 | inode->i_fop = &simple_dir_operations; | |
4100 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; | |
4101 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
4102 | ||
4103 | return inode; | |
4104 | } | |
4105 | ||
3de4586c | 4106 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
39279cc3 | 4107 | { |
d397712b | 4108 | struct inode *inode; |
4df27c4d | 4109 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 CM |
4110 | struct btrfs_root *sub_root = root; |
4111 | struct btrfs_key location; | |
76dda93c | 4112 | int index; |
5d4f98a2 | 4113 | int ret; |
39279cc3 CM |
4114 | |
4115 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
4116 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 4117 | |
39279cc3 | 4118 | ret = btrfs_inode_by_name(dir, dentry, &location); |
5f39d397 | 4119 | |
39279cc3 CM |
4120 | if (ret < 0) |
4121 | return ERR_PTR(ret); | |
5f39d397 | 4122 | |
4df27c4d YZ |
4123 | if (location.objectid == 0) |
4124 | return NULL; | |
4125 | ||
4126 | if (location.type == BTRFS_INODE_ITEM_KEY) { | |
73f73415 | 4127 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
4df27c4d YZ |
4128 | return inode; |
4129 | } | |
4130 | ||
4131 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); | |
4132 | ||
76dda93c | 4133 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
4df27c4d YZ |
4134 | ret = fixup_tree_root_location(root, dir, dentry, |
4135 | &location, &sub_root); | |
4136 | if (ret < 0) { | |
4137 | if (ret != -ENOENT) | |
4138 | inode = ERR_PTR(ret); | |
4139 | else | |
4140 | inode = new_simple_dir(dir->i_sb, &location, sub_root); | |
4141 | } else { | |
73f73415 | 4142 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
39279cc3 | 4143 | } |
76dda93c YZ |
4144 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
4145 | ||
34d19bad | 4146 | if (!IS_ERR(inode) && root != sub_root) { |
c71bf099 YZ |
4147 | down_read(&root->fs_info->cleanup_work_sem); |
4148 | if (!(inode->i_sb->s_flags & MS_RDONLY)) | |
4149 | btrfs_orphan_cleanup(sub_root); | |
4150 | up_read(&root->fs_info->cleanup_work_sem); | |
4151 | } | |
4152 | ||
3de4586c CM |
4153 | return inode; |
4154 | } | |
4155 | ||
fe15ce44 | 4156 | static int btrfs_dentry_delete(const struct dentry *dentry) |
76dda93c YZ |
4157 | { |
4158 | struct btrfs_root *root; | |
4159 | ||
efefb143 YZ |
4160 | if (!dentry->d_inode && !IS_ROOT(dentry)) |
4161 | dentry = dentry->d_parent; | |
76dda93c | 4162 | |
efefb143 YZ |
4163 | if (dentry->d_inode) { |
4164 | root = BTRFS_I(dentry->d_inode)->root; | |
4165 | if (btrfs_root_refs(&root->root_item) == 0) | |
4166 | return 1; | |
4167 | } | |
76dda93c YZ |
4168 | return 0; |
4169 | } | |
4170 | ||
3de4586c CM |
4171 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
4172 | struct nameidata *nd) | |
4173 | { | |
4174 | struct inode *inode; | |
4175 | ||
3de4586c CM |
4176 | inode = btrfs_lookup_dentry(dir, dentry); |
4177 | if (IS_ERR(inode)) | |
4178 | return ERR_CAST(inode); | |
7b128766 | 4179 | |
39279cc3 CM |
4180 | return d_splice_alias(inode, dentry); |
4181 | } | |
4182 | ||
39279cc3 CM |
4183 | static unsigned char btrfs_filetype_table[] = { |
4184 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
4185 | }; | |
4186 | ||
cbdf5a24 DW |
4187 | static int btrfs_real_readdir(struct file *filp, void *dirent, |
4188 | filldir_t filldir) | |
39279cc3 | 4189 | { |
6da6abae | 4190 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
4191 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4192 | struct btrfs_item *item; | |
4193 | struct btrfs_dir_item *di; | |
4194 | struct btrfs_key key; | |
5f39d397 | 4195 | struct btrfs_key found_key; |
39279cc3 CM |
4196 | struct btrfs_path *path; |
4197 | int ret; | |
4198 | u32 nritems; | |
5f39d397 | 4199 | struct extent_buffer *leaf; |
39279cc3 CM |
4200 | int slot; |
4201 | int advance; | |
4202 | unsigned char d_type; | |
4203 | int over = 0; | |
4204 | u32 di_cur; | |
4205 | u32 di_total; | |
4206 | u32 di_len; | |
4207 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
4208 | char tmp_name[32]; |
4209 | char *name_ptr; | |
4210 | int name_len; | |
39279cc3 CM |
4211 | |
4212 | /* FIXME, use a real flag for deciding about the key type */ | |
4213 | if (root->fs_info->tree_root == root) | |
4214 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 4215 | |
3954401f CM |
4216 | /* special case for "." */ |
4217 | if (filp->f_pos == 0) { | |
4218 | over = filldir(dirent, ".", 1, | |
4219 | 1, inode->i_ino, | |
4220 | DT_DIR); | |
4221 | if (over) | |
4222 | return 0; | |
4223 | filp->f_pos = 1; | |
4224 | } | |
3954401f CM |
4225 | /* special case for .., just use the back ref */ |
4226 | if (filp->f_pos == 1) { | |
5ecc7e5d | 4227 | u64 pino = parent_ino(filp->f_path.dentry); |
3954401f | 4228 | over = filldir(dirent, "..", 2, |
5ecc7e5d | 4229 | 2, pino, DT_DIR); |
3954401f | 4230 | if (over) |
49593bfa | 4231 | return 0; |
3954401f CM |
4232 | filp->f_pos = 2; |
4233 | } | |
49593bfa DW |
4234 | path = btrfs_alloc_path(); |
4235 | path->reada = 2; | |
4236 | ||
39279cc3 CM |
4237 | btrfs_set_key_type(&key, key_type); |
4238 | key.offset = filp->f_pos; | |
49593bfa | 4239 | key.objectid = inode->i_ino; |
5f39d397 | 4240 | |
39279cc3 CM |
4241 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
4242 | if (ret < 0) | |
4243 | goto err; | |
4244 | advance = 0; | |
49593bfa DW |
4245 | |
4246 | while (1) { | |
5f39d397 CM |
4247 | leaf = path->nodes[0]; |
4248 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
4249 | slot = path->slots[0]; |
4250 | if (advance || slot >= nritems) { | |
49593bfa | 4251 | if (slot >= nritems - 1) { |
39279cc3 CM |
4252 | ret = btrfs_next_leaf(root, path); |
4253 | if (ret) | |
4254 | break; | |
5f39d397 CM |
4255 | leaf = path->nodes[0]; |
4256 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
4257 | slot = path->slots[0]; |
4258 | } else { | |
4259 | slot++; | |
4260 | path->slots[0]++; | |
4261 | } | |
4262 | } | |
3de4586c | 4263 | |
39279cc3 | 4264 | advance = 1; |
5f39d397 CM |
4265 | item = btrfs_item_nr(leaf, slot); |
4266 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
4267 | ||
4268 | if (found_key.objectid != key.objectid) | |
39279cc3 | 4269 | break; |
5f39d397 | 4270 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 4271 | break; |
5f39d397 | 4272 | if (found_key.offset < filp->f_pos) |
39279cc3 | 4273 | continue; |
5f39d397 CM |
4274 | |
4275 | filp->f_pos = found_key.offset; | |
49593bfa | 4276 | |
39279cc3 CM |
4277 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
4278 | di_cur = 0; | |
5f39d397 | 4279 | di_total = btrfs_item_size(leaf, item); |
49593bfa DW |
4280 | |
4281 | while (di_cur < di_total) { | |
5f39d397 CM |
4282 | struct btrfs_key location; |
4283 | ||
4284 | name_len = btrfs_dir_name_len(leaf, di); | |
49593bfa | 4285 | if (name_len <= sizeof(tmp_name)) { |
5f39d397 CM |
4286 | name_ptr = tmp_name; |
4287 | } else { | |
4288 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
49593bfa DW |
4289 | if (!name_ptr) { |
4290 | ret = -ENOMEM; | |
4291 | goto err; | |
4292 | } | |
5f39d397 CM |
4293 | } |
4294 | read_extent_buffer(leaf, name_ptr, | |
4295 | (unsigned long)(di + 1), name_len); | |
4296 | ||
4297 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
4298 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
3de4586c CM |
4299 | |
4300 | /* is this a reference to our own snapshot? If so | |
4301 | * skip it | |
4302 | */ | |
4303 | if (location.type == BTRFS_ROOT_ITEM_KEY && | |
4304 | location.objectid == root->root_key.objectid) { | |
4305 | over = 0; | |
4306 | goto skip; | |
4307 | } | |
5f39d397 | 4308 | over = filldir(dirent, name_ptr, name_len, |
49593bfa | 4309 | found_key.offset, location.objectid, |
39279cc3 | 4310 | d_type); |
5f39d397 | 4311 | |
3de4586c | 4312 | skip: |
5f39d397 CM |
4313 | if (name_ptr != tmp_name) |
4314 | kfree(name_ptr); | |
4315 | ||
39279cc3 CM |
4316 | if (over) |
4317 | goto nopos; | |
5103e947 | 4318 | di_len = btrfs_dir_name_len(leaf, di) + |
49593bfa | 4319 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
4320 | di_cur += di_len; |
4321 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
4322 | } | |
4323 | } | |
49593bfa DW |
4324 | |
4325 | /* Reached end of directory/root. Bump pos past the last item. */ | |
5e591a07 | 4326 | if (key_type == BTRFS_DIR_INDEX_KEY) |
406266ab JE |
4327 | /* |
4328 | * 32-bit glibc will use getdents64, but then strtol - | |
4329 | * so the last number we can serve is this. | |
4330 | */ | |
4331 | filp->f_pos = 0x7fffffff; | |
5e591a07 YZ |
4332 | else |
4333 | filp->f_pos++; | |
39279cc3 CM |
4334 | nopos: |
4335 | ret = 0; | |
4336 | err: | |
39279cc3 | 4337 | btrfs_free_path(path); |
39279cc3 CM |
4338 | return ret; |
4339 | } | |
4340 | ||
a9185b41 | 4341 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
39279cc3 CM |
4342 | { |
4343 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4344 | struct btrfs_trans_handle *trans; | |
4345 | int ret = 0; | |
0af3d00b | 4346 | bool nolock = false; |
39279cc3 | 4347 | |
8929ecfa | 4348 | if (BTRFS_I(inode)->dummy_inode) |
4ca8b41e CM |
4349 | return 0; |
4350 | ||
0af3d00b JB |
4351 | smp_mb(); |
4352 | nolock = (root->fs_info->closing && root == root->fs_info->tree_root); | |
4353 | ||
a9185b41 | 4354 | if (wbc->sync_mode == WB_SYNC_ALL) { |
0af3d00b JB |
4355 | if (nolock) |
4356 | trans = btrfs_join_transaction_nolock(root, 1); | |
4357 | else | |
4358 | trans = btrfs_join_transaction(root, 1); | |
3612b495 TI |
4359 | if (IS_ERR(trans)) |
4360 | return PTR_ERR(trans); | |
39279cc3 | 4361 | btrfs_set_trans_block_group(trans, inode); |
0af3d00b JB |
4362 | if (nolock) |
4363 | ret = btrfs_end_transaction_nolock(trans, root); | |
4364 | else | |
4365 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 CM |
4366 | } |
4367 | return ret; | |
4368 | } | |
4369 | ||
4370 | /* | |
54aa1f4d | 4371 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
4372 | * inode changes. But, it is most likely to find the inode in cache. |
4373 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
4374 | * to keep or drop this code. | |
4375 | */ | |
4376 | void btrfs_dirty_inode(struct inode *inode) | |
4377 | { | |
4378 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4379 | struct btrfs_trans_handle *trans; | |
8929ecfa YZ |
4380 | int ret; |
4381 | ||
4382 | if (BTRFS_I(inode)->dummy_inode) | |
4383 | return; | |
39279cc3 | 4384 | |
f9295749 | 4385 | trans = btrfs_join_transaction(root, 1); |
3612b495 | 4386 | BUG_ON(IS_ERR(trans)); |
39279cc3 | 4387 | btrfs_set_trans_block_group(trans, inode); |
8929ecfa YZ |
4388 | |
4389 | ret = btrfs_update_inode(trans, root, inode); | |
94b60442 CM |
4390 | if (ret && ret == -ENOSPC) { |
4391 | /* whoops, lets try again with the full transaction */ | |
4392 | btrfs_end_transaction(trans, root); | |
4393 | trans = btrfs_start_transaction(root, 1); | |
9aeead73 CM |
4394 | if (IS_ERR(trans)) { |
4395 | if (printk_ratelimit()) { | |
4396 | printk(KERN_ERR "btrfs: fail to " | |
4397 | "dirty inode %lu error %ld\n", | |
4398 | inode->i_ino, PTR_ERR(trans)); | |
4399 | } | |
4400 | return; | |
4401 | } | |
94b60442 | 4402 | btrfs_set_trans_block_group(trans, inode); |
8929ecfa | 4403 | |
94b60442 CM |
4404 | ret = btrfs_update_inode(trans, root, inode); |
4405 | if (ret) { | |
9aeead73 CM |
4406 | if (printk_ratelimit()) { |
4407 | printk(KERN_ERR "btrfs: fail to " | |
4408 | "dirty inode %lu error %d\n", | |
4409 | inode->i_ino, ret); | |
4410 | } | |
94b60442 CM |
4411 | } |
4412 | } | |
39279cc3 | 4413 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
4414 | } |
4415 | ||
d352ac68 CM |
4416 | /* |
4417 | * find the highest existing sequence number in a directory | |
4418 | * and then set the in-memory index_cnt variable to reflect | |
4419 | * free sequence numbers | |
4420 | */ | |
aec7477b JB |
4421 | static int btrfs_set_inode_index_count(struct inode *inode) |
4422 | { | |
4423 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4424 | struct btrfs_key key, found_key; | |
4425 | struct btrfs_path *path; | |
4426 | struct extent_buffer *leaf; | |
4427 | int ret; | |
4428 | ||
4429 | key.objectid = inode->i_ino; | |
4430 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); | |
4431 | key.offset = (u64)-1; | |
4432 | ||
4433 | path = btrfs_alloc_path(); | |
4434 | if (!path) | |
4435 | return -ENOMEM; | |
4436 | ||
4437 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
4438 | if (ret < 0) | |
4439 | goto out; | |
4440 | /* FIXME: we should be able to handle this */ | |
4441 | if (ret == 0) | |
4442 | goto out; | |
4443 | ret = 0; | |
4444 | ||
4445 | /* | |
4446 | * MAGIC NUMBER EXPLANATION: | |
4447 | * since we search a directory based on f_pos we have to start at 2 | |
4448 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
4449 | * else has to start at 2 | |
4450 | */ | |
4451 | if (path->slots[0] == 0) { | |
4452 | BTRFS_I(inode)->index_cnt = 2; | |
4453 | goto out; | |
4454 | } | |
4455 | ||
4456 | path->slots[0]--; | |
4457 | ||
4458 | leaf = path->nodes[0]; | |
4459 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
4460 | ||
4461 | if (found_key.objectid != inode->i_ino || | |
4462 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { | |
4463 | BTRFS_I(inode)->index_cnt = 2; | |
4464 | goto out; | |
4465 | } | |
4466 | ||
4467 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
4468 | out: | |
4469 | btrfs_free_path(path); | |
4470 | return ret; | |
4471 | } | |
4472 | ||
d352ac68 CM |
4473 | /* |
4474 | * helper to find a free sequence number in a given directory. This current | |
4475 | * code is very simple, later versions will do smarter things in the btree | |
4476 | */ | |
3de4586c | 4477 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
aec7477b JB |
4478 | { |
4479 | int ret = 0; | |
4480 | ||
4481 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
4482 | ret = btrfs_set_inode_index_count(dir); | |
d397712b | 4483 | if (ret) |
aec7477b JB |
4484 | return ret; |
4485 | } | |
4486 | ||
00e4e6b3 | 4487 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
4488 | BTRFS_I(dir)->index_cnt++; |
4489 | ||
4490 | return ret; | |
4491 | } | |
4492 | ||
39279cc3 CM |
4493 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
4494 | struct btrfs_root *root, | |
aec7477b | 4495 | struct inode *dir, |
9c58309d | 4496 | const char *name, int name_len, |
d2fb3437 YZ |
4497 | u64 ref_objectid, u64 objectid, |
4498 | u64 alloc_hint, int mode, u64 *index) | |
39279cc3 CM |
4499 | { |
4500 | struct inode *inode; | |
5f39d397 | 4501 | struct btrfs_inode_item *inode_item; |
39279cc3 | 4502 | struct btrfs_key *location; |
5f39d397 | 4503 | struct btrfs_path *path; |
9c58309d CM |
4504 | struct btrfs_inode_ref *ref; |
4505 | struct btrfs_key key[2]; | |
4506 | u32 sizes[2]; | |
4507 | unsigned long ptr; | |
39279cc3 CM |
4508 | int ret; |
4509 | int owner; | |
4510 | ||
5f39d397 CM |
4511 | path = btrfs_alloc_path(); |
4512 | BUG_ON(!path); | |
4513 | ||
39279cc3 CM |
4514 | inode = new_inode(root->fs_info->sb); |
4515 | if (!inode) | |
4516 | return ERR_PTR(-ENOMEM); | |
4517 | ||
aec7477b | 4518 | if (dir) { |
3de4586c | 4519 | ret = btrfs_set_inode_index(dir, index); |
09771430 SF |
4520 | if (ret) { |
4521 | iput(inode); | |
aec7477b | 4522 | return ERR_PTR(ret); |
09771430 | 4523 | } |
aec7477b JB |
4524 | } |
4525 | /* | |
4526 | * index_cnt is ignored for everything but a dir, | |
4527 | * btrfs_get_inode_index_count has an explanation for the magic | |
4528 | * number | |
4529 | */ | |
4530 | BTRFS_I(inode)->index_cnt = 2; | |
39279cc3 | 4531 | BTRFS_I(inode)->root = root; |
e02119d5 | 4532 | BTRFS_I(inode)->generation = trans->transid; |
76195853 | 4533 | inode->i_generation = BTRFS_I(inode)->generation; |
6a63209f | 4534 | btrfs_set_inode_space_info(root, inode); |
b888db2b | 4535 | |
39279cc3 CM |
4536 | if (mode & S_IFDIR) |
4537 | owner = 0; | |
4538 | else | |
4539 | owner = 1; | |
d2fb3437 YZ |
4540 | BTRFS_I(inode)->block_group = |
4541 | btrfs_find_block_group(root, 0, alloc_hint, owner); | |
9c58309d CM |
4542 | |
4543 | key[0].objectid = objectid; | |
4544 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
4545 | key[0].offset = 0; | |
4546 | ||
4547 | key[1].objectid = objectid; | |
4548 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
4549 | key[1].offset = ref_objectid; | |
4550 | ||
4551 | sizes[0] = sizeof(struct btrfs_inode_item); | |
4552 | sizes[1] = name_len + sizeof(*ref); | |
4553 | ||
b9473439 | 4554 | path->leave_spinning = 1; |
9c58309d CM |
4555 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); |
4556 | if (ret != 0) | |
5f39d397 CM |
4557 | goto fail; |
4558 | ||
ecc11fab | 4559 | inode_init_owner(inode, dir, mode); |
39279cc3 | 4560 | inode->i_ino = objectid; |
a76a3cd4 | 4561 | inode_set_bytes(inode, 0); |
39279cc3 | 4562 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
5f39d397 CM |
4563 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
4564 | struct btrfs_inode_item); | |
e02119d5 | 4565 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
9c58309d CM |
4566 | |
4567 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
4568 | struct btrfs_inode_ref); | |
4569 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
00e4e6b3 | 4570 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); |
9c58309d CM |
4571 | ptr = (unsigned long)(ref + 1); |
4572 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
4573 | ||
5f39d397 CM |
4574 | btrfs_mark_buffer_dirty(path->nodes[0]); |
4575 | btrfs_free_path(path); | |
4576 | ||
39279cc3 CM |
4577 | location = &BTRFS_I(inode)->location; |
4578 | location->objectid = objectid; | |
39279cc3 CM |
4579 | location->offset = 0; |
4580 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
4581 | ||
6cbff00f CH |
4582 | btrfs_inherit_iflags(inode, dir); |
4583 | ||
94272164 CM |
4584 | if ((mode & S_IFREG)) { |
4585 | if (btrfs_test_opt(root, NODATASUM)) | |
4586 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
4587 | if (btrfs_test_opt(root, NODATACOW)) | |
4588 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; | |
4589 | } | |
4590 | ||
39279cc3 | 4591 | insert_inode_hash(inode); |
5d4f98a2 | 4592 | inode_tree_add(inode); |
39279cc3 | 4593 | return inode; |
5f39d397 | 4594 | fail: |
aec7477b JB |
4595 | if (dir) |
4596 | BTRFS_I(dir)->index_cnt--; | |
5f39d397 | 4597 | btrfs_free_path(path); |
09771430 | 4598 | iput(inode); |
5f39d397 | 4599 | return ERR_PTR(ret); |
39279cc3 CM |
4600 | } |
4601 | ||
4602 | static inline u8 btrfs_inode_type(struct inode *inode) | |
4603 | { | |
4604 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
4605 | } | |
4606 | ||
d352ac68 CM |
4607 | /* |
4608 | * utility function to add 'inode' into 'parent_inode' with | |
4609 | * a give name and a given sequence number. | |
4610 | * if 'add_backref' is true, also insert a backref from the | |
4611 | * inode to the parent directory. | |
4612 | */ | |
e02119d5 CM |
4613 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
4614 | struct inode *parent_inode, struct inode *inode, | |
4615 | const char *name, int name_len, int add_backref, u64 index) | |
39279cc3 | 4616 | { |
4df27c4d | 4617 | int ret = 0; |
39279cc3 | 4618 | struct btrfs_key key; |
e02119d5 | 4619 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
5f39d397 | 4620 | |
4df27c4d YZ |
4621 | if (unlikely(inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4622 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); | |
4623 | } else { | |
4624 | key.objectid = inode->i_ino; | |
4625 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
4626 | key.offset = 0; | |
4627 | } | |
4628 | ||
4629 | if (unlikely(inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) { | |
4630 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, | |
4631 | key.objectid, root->root_key.objectid, | |
4632 | parent_inode->i_ino, | |
4633 | index, name, name_len); | |
4634 | } else if (add_backref) { | |
4635 | ret = btrfs_insert_inode_ref(trans, root, | |
4636 | name, name_len, inode->i_ino, | |
4637 | parent_inode->i_ino, index); | |
4638 | } | |
39279cc3 | 4639 | |
39279cc3 | 4640 | if (ret == 0) { |
4df27c4d YZ |
4641 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
4642 | parent_inode->i_ino, &key, | |
4643 | btrfs_inode_type(inode), index); | |
4644 | BUG_ON(ret); | |
4645 | ||
dbe674a9 | 4646 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
e02119d5 | 4647 | name_len * 2); |
79c44584 | 4648 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
e02119d5 | 4649 | ret = btrfs_update_inode(trans, root, parent_inode); |
39279cc3 CM |
4650 | } |
4651 | return ret; | |
4652 | } | |
4653 | ||
4654 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
a1b075d2 JB |
4655 | struct inode *dir, struct dentry *dentry, |
4656 | struct inode *inode, int backref, u64 index) | |
39279cc3 | 4657 | { |
a1b075d2 JB |
4658 | int err = btrfs_add_link(trans, dir, inode, |
4659 | dentry->d_name.name, dentry->d_name.len, | |
4660 | backref, index); | |
39279cc3 CM |
4661 | if (!err) { |
4662 | d_instantiate(dentry, inode); | |
4663 | return 0; | |
4664 | } | |
4665 | if (err > 0) | |
4666 | err = -EEXIST; | |
4667 | return err; | |
4668 | } | |
4669 | ||
618e21d5 JB |
4670 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
4671 | int mode, dev_t rdev) | |
4672 | { | |
4673 | struct btrfs_trans_handle *trans; | |
4674 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 4675 | struct inode *inode = NULL; |
618e21d5 JB |
4676 | int err; |
4677 | int drop_inode = 0; | |
4678 | u64 objectid; | |
1832a6d5 | 4679 | unsigned long nr = 0; |
00e4e6b3 | 4680 | u64 index = 0; |
618e21d5 JB |
4681 | |
4682 | if (!new_valid_dev(rdev)) | |
4683 | return -EINVAL; | |
4684 | ||
a22285a6 YZ |
4685 | err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid); |
4686 | if (err) | |
4687 | return err; | |
4688 | ||
9ed74f2d JB |
4689 | /* |
4690 | * 2 for inode item and ref | |
4691 | * 2 for dir items | |
4692 | * 1 for xattr if selinux is on | |
4693 | */ | |
a22285a6 YZ |
4694 | trans = btrfs_start_transaction(root, 5); |
4695 | if (IS_ERR(trans)) | |
4696 | return PTR_ERR(trans); | |
1832a6d5 | 4697 | |
618e21d5 JB |
4698 | btrfs_set_trans_block_group(trans, dir); |
4699 | ||
aec7477b | 4700 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
a1b075d2 | 4701 | dentry->d_name.len, dir->i_ino, objectid, |
00e4e6b3 | 4702 | BTRFS_I(dir)->block_group, mode, &index); |
618e21d5 JB |
4703 | err = PTR_ERR(inode); |
4704 | if (IS_ERR(inode)) | |
4705 | goto out_unlock; | |
4706 | ||
f34f57a3 | 4707 | err = btrfs_init_inode_security(trans, inode, dir); |
33268eaf JB |
4708 | if (err) { |
4709 | drop_inode = 1; | |
4710 | goto out_unlock; | |
4711 | } | |
4712 | ||
618e21d5 | 4713 | btrfs_set_trans_block_group(trans, inode); |
a1b075d2 | 4714 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
618e21d5 JB |
4715 | if (err) |
4716 | drop_inode = 1; | |
4717 | else { | |
4718 | inode->i_op = &btrfs_special_inode_operations; | |
4719 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 4720 | btrfs_update_inode(trans, root, inode); |
618e21d5 | 4721 | } |
618e21d5 JB |
4722 | btrfs_update_inode_block_group(trans, inode); |
4723 | btrfs_update_inode_block_group(trans, dir); | |
4724 | out_unlock: | |
d3c2fdcf | 4725 | nr = trans->blocks_used; |
89ce8a63 | 4726 | btrfs_end_transaction_throttle(trans, root); |
a22285a6 | 4727 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
4728 | if (drop_inode) { |
4729 | inode_dec_link_count(inode); | |
4730 | iput(inode); | |
4731 | } | |
618e21d5 JB |
4732 | return err; |
4733 | } | |
4734 | ||
39279cc3 CM |
4735 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
4736 | int mode, struct nameidata *nd) | |
4737 | { | |
4738 | struct btrfs_trans_handle *trans; | |
4739 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 4740 | struct inode *inode = NULL; |
39279cc3 | 4741 | int drop_inode = 0; |
a22285a6 | 4742 | int err; |
1832a6d5 | 4743 | unsigned long nr = 0; |
39279cc3 | 4744 | u64 objectid; |
00e4e6b3 | 4745 | u64 index = 0; |
39279cc3 | 4746 | |
a22285a6 YZ |
4747 | err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid); |
4748 | if (err) | |
4749 | return err; | |
9ed74f2d JB |
4750 | /* |
4751 | * 2 for inode item and ref | |
4752 | * 2 for dir items | |
4753 | * 1 for xattr if selinux is on | |
4754 | */ | |
a22285a6 YZ |
4755 | trans = btrfs_start_transaction(root, 5); |
4756 | if (IS_ERR(trans)) | |
4757 | return PTR_ERR(trans); | |
9ed74f2d | 4758 | |
39279cc3 CM |
4759 | btrfs_set_trans_block_group(trans, dir); |
4760 | ||
aec7477b | 4761 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
a1b075d2 JB |
4762 | dentry->d_name.len, dir->i_ino, objectid, |
4763 | BTRFS_I(dir)->block_group, mode, &index); | |
39279cc3 CM |
4764 | err = PTR_ERR(inode); |
4765 | if (IS_ERR(inode)) | |
4766 | goto out_unlock; | |
4767 | ||
f34f57a3 | 4768 | err = btrfs_init_inode_security(trans, inode, dir); |
33268eaf JB |
4769 | if (err) { |
4770 | drop_inode = 1; | |
4771 | goto out_unlock; | |
4772 | } | |
4773 | ||
39279cc3 | 4774 | btrfs_set_trans_block_group(trans, inode); |
a1b075d2 | 4775 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 CM |
4776 | if (err) |
4777 | drop_inode = 1; | |
4778 | else { | |
4779 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 4780 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
4781 | inode->i_fop = &btrfs_file_operations; |
4782 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e | 4783 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 | 4784 | } |
39279cc3 CM |
4785 | btrfs_update_inode_block_group(trans, inode); |
4786 | btrfs_update_inode_block_group(trans, dir); | |
4787 | out_unlock: | |
d3c2fdcf | 4788 | nr = trans->blocks_used; |
ab78c84d | 4789 | btrfs_end_transaction_throttle(trans, root); |
39279cc3 CM |
4790 | if (drop_inode) { |
4791 | inode_dec_link_count(inode); | |
4792 | iput(inode); | |
4793 | } | |
d3c2fdcf | 4794 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
4795 | return err; |
4796 | } | |
4797 | ||
4798 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
4799 | struct dentry *dentry) | |
4800 | { | |
4801 | struct btrfs_trans_handle *trans; | |
4802 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
4803 | struct inode *inode = old_dentry->d_inode; | |
00e4e6b3 | 4804 | u64 index; |
1832a6d5 | 4805 | unsigned long nr = 0; |
39279cc3 CM |
4806 | int err; |
4807 | int drop_inode = 0; | |
4808 | ||
4809 | if (inode->i_nlink == 0) | |
4810 | return -ENOENT; | |
4811 | ||
4a8be425 TH |
4812 | /* do not allow sys_link's with other subvols of the same device */ |
4813 | if (root->objectid != BTRFS_I(inode)->root->objectid) | |
4814 | return -EPERM; | |
4815 | ||
9ed74f2d | 4816 | btrfs_inc_nlink(inode); |
bc1cbf1f | 4817 | inode->i_ctime = CURRENT_TIME; |
9ed74f2d | 4818 | |
3de4586c | 4819 | err = btrfs_set_inode_index(dir, &index); |
aec7477b JB |
4820 | if (err) |
4821 | goto fail; | |
4822 | ||
a22285a6 YZ |
4823 | /* |
4824 | * 1 item for inode ref | |
4825 | * 2 items for dir items | |
4826 | */ | |
4827 | trans = btrfs_start_transaction(root, 3); | |
4828 | if (IS_ERR(trans)) { | |
4829 | err = PTR_ERR(trans); | |
4830 | goto fail; | |
4831 | } | |
5f39d397 | 4832 | |
39279cc3 | 4833 | btrfs_set_trans_block_group(trans, dir); |
7de9c6ee | 4834 | ihold(inode); |
aec7477b | 4835 | |
a1b075d2 | 4836 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
5f39d397 | 4837 | |
a5719521 | 4838 | if (err) { |
54aa1f4d | 4839 | drop_inode = 1; |
a5719521 | 4840 | } else { |
6a912213 | 4841 | struct dentry *parent = dget_parent(dentry); |
a5719521 YZ |
4842 | btrfs_update_inode_block_group(trans, dir); |
4843 | err = btrfs_update_inode(trans, root, inode); | |
4844 | BUG_ON(err); | |
6a912213 JB |
4845 | btrfs_log_new_name(trans, inode, NULL, parent); |
4846 | dput(parent); | |
a5719521 | 4847 | } |
39279cc3 | 4848 | |
d3c2fdcf | 4849 | nr = trans->blocks_used; |
ab78c84d | 4850 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 4851 | fail: |
39279cc3 CM |
4852 | if (drop_inode) { |
4853 | inode_dec_link_count(inode); | |
4854 | iput(inode); | |
4855 | } | |
d3c2fdcf | 4856 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
4857 | return err; |
4858 | } | |
4859 | ||
39279cc3 CM |
4860 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
4861 | { | |
b9d86667 | 4862 | struct inode *inode = NULL; |
39279cc3 CM |
4863 | struct btrfs_trans_handle *trans; |
4864 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
4865 | int err = 0; | |
4866 | int drop_on_err = 0; | |
b9d86667 | 4867 | u64 objectid = 0; |
00e4e6b3 | 4868 | u64 index = 0; |
d3c2fdcf | 4869 | unsigned long nr = 1; |
39279cc3 | 4870 | |
a22285a6 YZ |
4871 | err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid); |
4872 | if (err) | |
4873 | return err; | |
4874 | ||
9ed74f2d JB |
4875 | /* |
4876 | * 2 items for inode and ref | |
4877 | * 2 items for dir items | |
4878 | * 1 for xattr if selinux is on | |
4879 | */ | |
a22285a6 YZ |
4880 | trans = btrfs_start_transaction(root, 5); |
4881 | if (IS_ERR(trans)) | |
4882 | return PTR_ERR(trans); | |
9ed74f2d | 4883 | btrfs_set_trans_block_group(trans, dir); |
39279cc3 | 4884 | |
aec7477b | 4885 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
a1b075d2 | 4886 | dentry->d_name.len, dir->i_ino, objectid, |
00e4e6b3 CM |
4887 | BTRFS_I(dir)->block_group, S_IFDIR | mode, |
4888 | &index); | |
39279cc3 CM |
4889 | if (IS_ERR(inode)) { |
4890 | err = PTR_ERR(inode); | |
4891 | goto out_fail; | |
4892 | } | |
5f39d397 | 4893 | |
39279cc3 | 4894 | drop_on_err = 1; |
33268eaf | 4895 | |
f34f57a3 | 4896 | err = btrfs_init_inode_security(trans, inode, dir); |
33268eaf JB |
4897 | if (err) |
4898 | goto out_fail; | |
4899 | ||
39279cc3 CM |
4900 | inode->i_op = &btrfs_dir_inode_operations; |
4901 | inode->i_fop = &btrfs_dir_file_operations; | |
4902 | btrfs_set_trans_block_group(trans, inode); | |
4903 | ||
dbe674a9 | 4904 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
4905 | err = btrfs_update_inode(trans, root, inode); |
4906 | if (err) | |
4907 | goto out_fail; | |
5f39d397 | 4908 | |
a1b075d2 JB |
4909 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
4910 | dentry->d_name.len, 0, index); | |
39279cc3 CM |
4911 | if (err) |
4912 | goto out_fail; | |
5f39d397 | 4913 | |
39279cc3 CM |
4914 | d_instantiate(dentry, inode); |
4915 | drop_on_err = 0; | |
39279cc3 CM |
4916 | btrfs_update_inode_block_group(trans, inode); |
4917 | btrfs_update_inode_block_group(trans, dir); | |
4918 | ||
4919 | out_fail: | |
d3c2fdcf | 4920 | nr = trans->blocks_used; |
ab78c84d | 4921 | btrfs_end_transaction_throttle(trans, root); |
39279cc3 CM |
4922 | if (drop_on_err) |
4923 | iput(inode); | |
d3c2fdcf | 4924 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
4925 | return err; |
4926 | } | |
4927 | ||
d352ac68 CM |
4928 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
4929 | * and an extent that you want to insert, deal with overlap and insert | |
4930 | * the new extent into the tree. | |
4931 | */ | |
3b951516 CM |
4932 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
4933 | struct extent_map *existing, | |
e6dcd2dc CM |
4934 | struct extent_map *em, |
4935 | u64 map_start, u64 map_len) | |
3b951516 CM |
4936 | { |
4937 | u64 start_diff; | |
3b951516 | 4938 | |
e6dcd2dc CM |
4939 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
4940 | start_diff = map_start - em->start; | |
4941 | em->start = map_start; | |
4942 | em->len = map_len; | |
c8b97818 CM |
4943 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
4944 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
e6dcd2dc | 4945 | em->block_start += start_diff; |
c8b97818 CM |
4946 | em->block_len -= start_diff; |
4947 | } | |
e6dcd2dc | 4948 | return add_extent_mapping(em_tree, em); |
3b951516 CM |
4949 | } |
4950 | ||
c8b97818 CM |
4951 | static noinline int uncompress_inline(struct btrfs_path *path, |
4952 | struct inode *inode, struct page *page, | |
4953 | size_t pg_offset, u64 extent_offset, | |
4954 | struct btrfs_file_extent_item *item) | |
4955 | { | |
4956 | int ret; | |
4957 | struct extent_buffer *leaf = path->nodes[0]; | |
4958 | char *tmp; | |
4959 | size_t max_size; | |
4960 | unsigned long inline_size; | |
4961 | unsigned long ptr; | |
261507a0 | 4962 | int compress_type; |
c8b97818 CM |
4963 | |
4964 | WARN_ON(pg_offset != 0); | |
261507a0 | 4965 | compress_type = btrfs_file_extent_compression(leaf, item); |
c8b97818 CM |
4966 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
4967 | inline_size = btrfs_file_extent_inline_item_len(leaf, | |
4968 | btrfs_item_nr(leaf, path->slots[0])); | |
4969 | tmp = kmalloc(inline_size, GFP_NOFS); | |
4970 | ptr = btrfs_file_extent_inline_start(item); | |
4971 | ||
4972 | read_extent_buffer(leaf, tmp, ptr, inline_size); | |
4973 | ||
5b050f04 | 4974 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
261507a0 LZ |
4975 | ret = btrfs_decompress(compress_type, tmp, page, |
4976 | extent_offset, inline_size, max_size); | |
c8b97818 CM |
4977 | if (ret) { |
4978 | char *kaddr = kmap_atomic(page, KM_USER0); | |
4979 | unsigned long copy_size = min_t(u64, | |
4980 | PAGE_CACHE_SIZE - pg_offset, | |
4981 | max_size - extent_offset); | |
4982 | memset(kaddr + pg_offset, 0, copy_size); | |
4983 | kunmap_atomic(kaddr, KM_USER0); | |
4984 | } | |
4985 | kfree(tmp); | |
4986 | return 0; | |
4987 | } | |
4988 | ||
d352ac68 CM |
4989 | /* |
4990 | * a bit scary, this does extent mapping from logical file offset to the disk. | |
d397712b CM |
4991 | * the ugly parts come from merging extents from the disk with the in-ram |
4992 | * representation. This gets more complex because of the data=ordered code, | |
d352ac68 CM |
4993 | * where the in-ram extents might be locked pending data=ordered completion. |
4994 | * | |
4995 | * This also copies inline extents directly into the page. | |
4996 | */ | |
d397712b | 4997 | |
a52d9a80 | 4998 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 4999 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
5000 | int create) |
5001 | { | |
5002 | int ret; | |
5003 | int err = 0; | |
db94535d | 5004 | u64 bytenr; |
a52d9a80 CM |
5005 | u64 extent_start = 0; |
5006 | u64 extent_end = 0; | |
5007 | u64 objectid = inode->i_ino; | |
5008 | u32 found_type; | |
f421950f | 5009 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
5010 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5011 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
5012 | struct extent_buffer *leaf; |
5013 | struct btrfs_key found_key; | |
a52d9a80 CM |
5014 | struct extent_map *em = NULL; |
5015 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 5016 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 | 5017 | struct btrfs_trans_handle *trans = NULL; |
261507a0 | 5018 | int compress_type; |
a52d9a80 | 5019 | |
a52d9a80 | 5020 | again: |
890871be | 5021 | read_lock(&em_tree->lock); |
d1310b2e | 5022 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
5023 | if (em) |
5024 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
890871be | 5025 | read_unlock(&em_tree->lock); |
d1310b2e | 5026 | |
a52d9a80 | 5027 | if (em) { |
e1c4b745 CM |
5028 | if (em->start > start || em->start + em->len <= start) |
5029 | free_extent_map(em); | |
5030 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
5031 | free_extent_map(em); |
5032 | else | |
5033 | goto out; | |
a52d9a80 | 5034 | } |
d1310b2e | 5035 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 5036 | if (!em) { |
d1310b2e CM |
5037 | err = -ENOMEM; |
5038 | goto out; | |
a52d9a80 | 5039 | } |
e6dcd2dc | 5040 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 5041 | em->start = EXTENT_MAP_HOLE; |
445a6944 | 5042 | em->orig_start = EXTENT_MAP_HOLE; |
d1310b2e | 5043 | em->len = (u64)-1; |
c8b97818 | 5044 | em->block_len = (u64)-1; |
f421950f CM |
5045 | |
5046 | if (!path) { | |
5047 | path = btrfs_alloc_path(); | |
5048 | BUG_ON(!path); | |
5049 | } | |
5050 | ||
179e29e4 CM |
5051 | ret = btrfs_lookup_file_extent(trans, root, path, |
5052 | objectid, start, trans != NULL); | |
a52d9a80 CM |
5053 | if (ret < 0) { |
5054 | err = ret; | |
5055 | goto out; | |
5056 | } | |
5057 | ||
5058 | if (ret != 0) { | |
5059 | if (path->slots[0] == 0) | |
5060 | goto not_found; | |
5061 | path->slots[0]--; | |
5062 | } | |
5063 | ||
5f39d397 CM |
5064 | leaf = path->nodes[0]; |
5065 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 5066 | struct btrfs_file_extent_item); |
a52d9a80 | 5067 | /* are we inside the extent that was found? */ |
5f39d397 CM |
5068 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
5069 | found_type = btrfs_key_type(&found_key); | |
5070 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
5071 | found_type != BTRFS_EXTENT_DATA_KEY) { |
5072 | goto not_found; | |
5073 | } | |
5074 | ||
5f39d397 CM |
5075 | found_type = btrfs_file_extent_type(leaf, item); |
5076 | extent_start = found_key.offset; | |
261507a0 | 5077 | compress_type = btrfs_file_extent_compression(leaf, item); |
d899e052 YZ |
5078 | if (found_type == BTRFS_FILE_EXTENT_REG || |
5079 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 | 5080 | extent_end = extent_start + |
db94535d | 5081 | btrfs_file_extent_num_bytes(leaf, item); |
9036c102 YZ |
5082 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
5083 | size_t size; | |
5084 | size = btrfs_file_extent_inline_len(leaf, item); | |
5085 | extent_end = (extent_start + size + root->sectorsize - 1) & | |
5086 | ~((u64)root->sectorsize - 1); | |
5087 | } | |
5088 | ||
5089 | if (start >= extent_end) { | |
5090 | path->slots[0]++; | |
5091 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
5092 | ret = btrfs_next_leaf(root, path); | |
5093 | if (ret < 0) { | |
5094 | err = ret; | |
5095 | goto out; | |
a52d9a80 | 5096 | } |
9036c102 YZ |
5097 | if (ret > 0) |
5098 | goto not_found; | |
5099 | leaf = path->nodes[0]; | |
a52d9a80 | 5100 | } |
9036c102 YZ |
5101 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
5102 | if (found_key.objectid != objectid || | |
5103 | found_key.type != BTRFS_EXTENT_DATA_KEY) | |
5104 | goto not_found; | |
5105 | if (start + len <= found_key.offset) | |
5106 | goto not_found; | |
5107 | em->start = start; | |
5108 | em->len = found_key.offset - start; | |
5109 | goto not_found_em; | |
5110 | } | |
5111 | ||
d899e052 YZ |
5112 | if (found_type == BTRFS_FILE_EXTENT_REG || |
5113 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
9036c102 YZ |
5114 | em->start = extent_start; |
5115 | em->len = extent_end - extent_start; | |
ff5b7ee3 YZ |
5116 | em->orig_start = extent_start - |
5117 | btrfs_file_extent_offset(leaf, item); | |
db94535d CM |
5118 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
5119 | if (bytenr == 0) { | |
5f39d397 | 5120 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
5121 | goto insert; |
5122 | } | |
261507a0 | 5123 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 | 5124 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
261507a0 | 5125 | em->compress_type = compress_type; |
c8b97818 CM |
5126 | em->block_start = bytenr; |
5127 | em->block_len = btrfs_file_extent_disk_num_bytes(leaf, | |
5128 | item); | |
5129 | } else { | |
5130 | bytenr += btrfs_file_extent_offset(leaf, item); | |
5131 | em->block_start = bytenr; | |
5132 | em->block_len = em->len; | |
d899e052 YZ |
5133 | if (found_type == BTRFS_FILE_EXTENT_PREALLOC) |
5134 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
c8b97818 | 5135 | } |
a52d9a80 CM |
5136 | goto insert; |
5137 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 5138 | unsigned long ptr; |
a52d9a80 | 5139 | char *map; |
3326d1b0 CM |
5140 | size_t size; |
5141 | size_t extent_offset; | |
5142 | size_t copy_size; | |
a52d9a80 | 5143 | |
689f9346 | 5144 | em->block_start = EXTENT_MAP_INLINE; |
c8b97818 | 5145 | if (!page || create) { |
689f9346 | 5146 | em->start = extent_start; |
9036c102 | 5147 | em->len = extent_end - extent_start; |
689f9346 Y |
5148 | goto out; |
5149 | } | |
5f39d397 | 5150 | |
9036c102 YZ |
5151 | size = btrfs_file_extent_inline_len(leaf, item); |
5152 | extent_offset = page_offset(page) + pg_offset - extent_start; | |
70dec807 | 5153 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
3326d1b0 | 5154 | size - extent_offset); |
3326d1b0 | 5155 | em->start = extent_start + extent_offset; |
70dec807 CM |
5156 | em->len = (copy_size + root->sectorsize - 1) & |
5157 | ~((u64)root->sectorsize - 1); | |
ff5b7ee3 | 5158 | em->orig_start = EXTENT_MAP_INLINE; |
261507a0 | 5159 | if (compress_type) { |
c8b97818 | 5160 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
261507a0 LZ |
5161 | em->compress_type = compress_type; |
5162 | } | |
689f9346 | 5163 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
179e29e4 | 5164 | if (create == 0 && !PageUptodate(page)) { |
261507a0 LZ |
5165 | if (btrfs_file_extent_compression(leaf, item) != |
5166 | BTRFS_COMPRESS_NONE) { | |
c8b97818 CM |
5167 | ret = uncompress_inline(path, inode, page, |
5168 | pg_offset, | |
5169 | extent_offset, item); | |
5170 | BUG_ON(ret); | |
5171 | } else { | |
5172 | map = kmap(page); | |
5173 | read_extent_buffer(leaf, map + pg_offset, ptr, | |
5174 | copy_size); | |
93c82d57 CM |
5175 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
5176 | memset(map + pg_offset + copy_size, 0, | |
5177 | PAGE_CACHE_SIZE - pg_offset - | |
5178 | copy_size); | |
5179 | } | |
c8b97818 CM |
5180 | kunmap(page); |
5181 | } | |
179e29e4 CM |
5182 | flush_dcache_page(page); |
5183 | } else if (create && PageUptodate(page)) { | |
0ca1f7ce | 5184 | WARN_ON(1); |
179e29e4 CM |
5185 | if (!trans) { |
5186 | kunmap(page); | |
5187 | free_extent_map(em); | |
5188 | em = NULL; | |
5189 | btrfs_release_path(root, path); | |
f9295749 | 5190 | trans = btrfs_join_transaction(root, 1); |
3612b495 TI |
5191 | if (IS_ERR(trans)) |
5192 | return ERR_CAST(trans); | |
179e29e4 CM |
5193 | goto again; |
5194 | } | |
c8b97818 | 5195 | map = kmap(page); |
70dec807 | 5196 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 | 5197 | copy_size); |
c8b97818 | 5198 | kunmap(page); |
179e29e4 | 5199 | btrfs_mark_buffer_dirty(leaf); |
a52d9a80 | 5200 | } |
d1310b2e CM |
5201 | set_extent_uptodate(io_tree, em->start, |
5202 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
5203 | goto insert; |
5204 | } else { | |
d397712b | 5205 | printk(KERN_ERR "btrfs unknown found_type %d\n", found_type); |
a52d9a80 CM |
5206 | WARN_ON(1); |
5207 | } | |
5208 | not_found: | |
5209 | em->start = start; | |
d1310b2e | 5210 | em->len = len; |
a52d9a80 | 5211 | not_found_em: |
5f39d397 | 5212 | em->block_start = EXTENT_MAP_HOLE; |
9036c102 | 5213 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
a52d9a80 CM |
5214 | insert: |
5215 | btrfs_release_path(root, path); | |
d1310b2e | 5216 | if (em->start > start || extent_map_end(em) <= start) { |
d397712b CM |
5217 | printk(KERN_ERR "Btrfs: bad extent! em: [%llu %llu] passed " |
5218 | "[%llu %llu]\n", (unsigned long long)em->start, | |
5219 | (unsigned long long)em->len, | |
5220 | (unsigned long long)start, | |
5221 | (unsigned long long)len); | |
a52d9a80 CM |
5222 | err = -EIO; |
5223 | goto out; | |
5224 | } | |
d1310b2e CM |
5225 | |
5226 | err = 0; | |
890871be | 5227 | write_lock(&em_tree->lock); |
a52d9a80 | 5228 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
5229 | /* it is possible that someone inserted the extent into the tree |
5230 | * while we had the lock dropped. It is also possible that | |
5231 | * an overlapping map exists in the tree | |
5232 | */ | |
a52d9a80 | 5233 | if (ret == -EEXIST) { |
3b951516 | 5234 | struct extent_map *existing; |
e6dcd2dc CM |
5235 | |
5236 | ret = 0; | |
5237 | ||
3b951516 | 5238 | existing = lookup_extent_mapping(em_tree, start, len); |
e1c4b745 CM |
5239 | if (existing && (existing->start > start || |
5240 | existing->start + existing->len <= start)) { | |
5241 | free_extent_map(existing); | |
5242 | existing = NULL; | |
5243 | } | |
3b951516 CM |
5244 | if (!existing) { |
5245 | existing = lookup_extent_mapping(em_tree, em->start, | |
5246 | em->len); | |
5247 | if (existing) { | |
5248 | err = merge_extent_mapping(em_tree, existing, | |
e6dcd2dc CM |
5249 | em, start, |
5250 | root->sectorsize); | |
3b951516 CM |
5251 | free_extent_map(existing); |
5252 | if (err) { | |
5253 | free_extent_map(em); | |
5254 | em = NULL; | |
5255 | } | |
5256 | } else { | |
5257 | err = -EIO; | |
3b951516 CM |
5258 | free_extent_map(em); |
5259 | em = NULL; | |
5260 | } | |
5261 | } else { | |
5262 | free_extent_map(em); | |
5263 | em = existing; | |
e6dcd2dc | 5264 | err = 0; |
a52d9a80 | 5265 | } |
a52d9a80 | 5266 | } |
890871be | 5267 | write_unlock(&em_tree->lock); |
a52d9a80 | 5268 | out: |
f421950f CM |
5269 | if (path) |
5270 | btrfs_free_path(path); | |
a52d9a80 CM |
5271 | if (trans) { |
5272 | ret = btrfs_end_transaction(trans, root); | |
d397712b | 5273 | if (!err) |
a52d9a80 CM |
5274 | err = ret; |
5275 | } | |
a52d9a80 CM |
5276 | if (err) { |
5277 | free_extent_map(em); | |
a52d9a80 CM |
5278 | return ERR_PTR(err); |
5279 | } | |
5280 | return em; | |
5281 | } | |
5282 | ||
4b46fce2 JB |
5283 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
5284 | u64 start, u64 len) | |
5285 | { | |
5286 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5287 | struct btrfs_trans_handle *trans; | |
5288 | struct extent_map *em; | |
5289 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
5290 | struct btrfs_key ins; | |
5291 | u64 alloc_hint; | |
5292 | int ret; | |
5293 | ||
5294 | btrfs_drop_extent_cache(inode, start, start + len - 1, 0); | |
5295 | ||
5296 | trans = btrfs_join_transaction(root, 0); | |
3612b495 TI |
5297 | if (IS_ERR(trans)) |
5298 | return ERR_CAST(trans); | |
4b46fce2 JB |
5299 | |
5300 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; | |
5301 | ||
5302 | alloc_hint = get_extent_allocation_hint(inode, start, len); | |
5303 | ret = btrfs_reserve_extent(trans, root, len, root->sectorsize, 0, | |
5304 | alloc_hint, (u64)-1, &ins, 1); | |
5305 | if (ret) { | |
5306 | em = ERR_PTR(ret); | |
5307 | goto out; | |
5308 | } | |
5309 | ||
5310 | em = alloc_extent_map(GFP_NOFS); | |
5311 | if (!em) { | |
5312 | em = ERR_PTR(-ENOMEM); | |
5313 | goto out; | |
5314 | } | |
5315 | ||
5316 | em->start = start; | |
5317 | em->orig_start = em->start; | |
5318 | em->len = ins.offset; | |
5319 | ||
5320 | em->block_start = ins.objectid; | |
5321 | em->block_len = ins.offset; | |
5322 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
5323 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
5324 | ||
5325 | while (1) { | |
5326 | write_lock(&em_tree->lock); | |
5327 | ret = add_extent_mapping(em_tree, em); | |
5328 | write_unlock(&em_tree->lock); | |
5329 | if (ret != -EEXIST) | |
5330 | break; | |
5331 | btrfs_drop_extent_cache(inode, start, start + em->len - 1, 0); | |
5332 | } | |
5333 | ||
5334 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, | |
5335 | ins.offset, ins.offset, 0); | |
5336 | if (ret) { | |
5337 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset); | |
5338 | em = ERR_PTR(ret); | |
5339 | } | |
5340 | out: | |
5341 | btrfs_end_transaction(trans, root); | |
5342 | return em; | |
5343 | } | |
5344 | ||
46bfbb5c CM |
5345 | /* |
5346 | * returns 1 when the nocow is safe, < 1 on error, 0 if the | |
5347 | * block must be cow'd | |
5348 | */ | |
5349 | static noinline int can_nocow_odirect(struct btrfs_trans_handle *trans, | |
5350 | struct inode *inode, u64 offset, u64 len) | |
5351 | { | |
5352 | struct btrfs_path *path; | |
5353 | int ret; | |
5354 | struct extent_buffer *leaf; | |
5355 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5356 | struct btrfs_file_extent_item *fi; | |
5357 | struct btrfs_key key; | |
5358 | u64 disk_bytenr; | |
5359 | u64 backref_offset; | |
5360 | u64 extent_end; | |
5361 | u64 num_bytes; | |
5362 | int slot; | |
5363 | int found_type; | |
5364 | ||
5365 | path = btrfs_alloc_path(); | |
5366 | if (!path) | |
5367 | return -ENOMEM; | |
5368 | ||
5369 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
5370 | offset, 0); | |
5371 | if (ret < 0) | |
5372 | goto out; | |
5373 | ||
5374 | slot = path->slots[0]; | |
5375 | if (ret == 1) { | |
5376 | if (slot == 0) { | |
5377 | /* can't find the item, must cow */ | |
5378 | ret = 0; | |
5379 | goto out; | |
5380 | } | |
5381 | slot--; | |
5382 | } | |
5383 | ret = 0; | |
5384 | leaf = path->nodes[0]; | |
5385 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
5386 | if (key.objectid != inode->i_ino || | |
5387 | key.type != BTRFS_EXTENT_DATA_KEY) { | |
5388 | /* not our file or wrong item type, must cow */ | |
5389 | goto out; | |
5390 | } | |
5391 | ||
5392 | if (key.offset > offset) { | |
5393 | /* Wrong offset, must cow */ | |
5394 | goto out; | |
5395 | } | |
5396 | ||
5397 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
5398 | found_type = btrfs_file_extent_type(leaf, fi); | |
5399 | if (found_type != BTRFS_FILE_EXTENT_REG && | |
5400 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { | |
5401 | /* not a regular extent, must cow */ | |
5402 | goto out; | |
5403 | } | |
5404 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
5405 | backref_offset = btrfs_file_extent_offset(leaf, fi); | |
5406 | ||
5407 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); | |
5408 | if (extent_end < offset + len) { | |
5409 | /* extent doesn't include our full range, must cow */ | |
5410 | goto out; | |
5411 | } | |
5412 | ||
5413 | if (btrfs_extent_readonly(root, disk_bytenr)) | |
5414 | goto out; | |
5415 | ||
5416 | /* | |
5417 | * look for other files referencing this extent, if we | |
5418 | * find any we must cow | |
5419 | */ | |
5420 | if (btrfs_cross_ref_exist(trans, root, inode->i_ino, | |
5421 | key.offset - backref_offset, disk_bytenr)) | |
5422 | goto out; | |
5423 | ||
5424 | /* | |
5425 | * adjust disk_bytenr and num_bytes to cover just the bytes | |
5426 | * in this extent we are about to write. If there | |
5427 | * are any csums in that range we have to cow in order | |
5428 | * to keep the csums correct | |
5429 | */ | |
5430 | disk_bytenr += backref_offset; | |
5431 | disk_bytenr += offset - key.offset; | |
5432 | num_bytes = min(offset + len, extent_end) - offset; | |
5433 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
5434 | goto out; | |
5435 | /* | |
5436 | * all of the above have passed, it is safe to overwrite this extent | |
5437 | * without cow | |
5438 | */ | |
5439 | ret = 1; | |
5440 | out: | |
5441 | btrfs_free_path(path); | |
5442 | return ret; | |
5443 | } | |
5444 | ||
4b46fce2 JB |
5445 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
5446 | struct buffer_head *bh_result, int create) | |
5447 | { | |
5448 | struct extent_map *em; | |
5449 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5450 | u64 start = iblock << inode->i_blkbits; | |
5451 | u64 len = bh_result->b_size; | |
46bfbb5c | 5452 | struct btrfs_trans_handle *trans; |
4b46fce2 JB |
5453 | |
5454 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
5455 | if (IS_ERR(em)) | |
5456 | return PTR_ERR(em); | |
5457 | ||
5458 | /* | |
5459 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered | |
5460 | * io. INLINE is special, and we could probably kludge it in here, but | |
5461 | * it's still buffered so for safety lets just fall back to the generic | |
5462 | * buffered path. | |
5463 | * | |
5464 | * For COMPRESSED we _have_ to read the entire extent in so we can | |
5465 | * decompress it, so there will be buffering required no matter what we | |
5466 | * do, so go ahead and fallback to buffered. | |
5467 | * | |
5468 | * We return -ENOTBLK because thats what makes DIO go ahead and go back | |
5469 | * to buffered IO. Don't blame me, this is the price we pay for using | |
5470 | * the generic code. | |
5471 | */ | |
5472 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || | |
5473 | em->block_start == EXTENT_MAP_INLINE) { | |
5474 | free_extent_map(em); | |
5475 | return -ENOTBLK; | |
5476 | } | |
5477 | ||
5478 | /* Just a good old fashioned hole, return */ | |
5479 | if (!create && (em->block_start == EXTENT_MAP_HOLE || | |
5480 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
5481 | free_extent_map(em); | |
5482 | /* DIO will do one hole at a time, so just unlock a sector */ | |
5483 | unlock_extent(&BTRFS_I(inode)->io_tree, start, | |
5484 | start + root->sectorsize - 1, GFP_NOFS); | |
5485 | return 0; | |
5486 | } | |
5487 | ||
5488 | /* | |
5489 | * We don't allocate a new extent in the following cases | |
5490 | * | |
5491 | * 1) The inode is marked as NODATACOW. In this case we'll just use the | |
5492 | * existing extent. | |
5493 | * 2) The extent is marked as PREALLOC. We're good to go here and can | |
5494 | * just use the extent. | |
5495 | * | |
5496 | */ | |
46bfbb5c CM |
5497 | if (!create) { |
5498 | len = em->len - (start - em->start); | |
4b46fce2 | 5499 | goto map; |
46bfbb5c | 5500 | } |
4b46fce2 JB |
5501 | |
5502 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || | |
5503 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
5504 | em->block_start != EXTENT_MAP_HOLE)) { | |
4b46fce2 JB |
5505 | int type; |
5506 | int ret; | |
46bfbb5c | 5507 | u64 block_start; |
4b46fce2 JB |
5508 | |
5509 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
5510 | type = BTRFS_ORDERED_PREALLOC; | |
5511 | else | |
5512 | type = BTRFS_ORDERED_NOCOW; | |
46bfbb5c | 5513 | len = min(len, em->len - (start - em->start)); |
4b46fce2 | 5514 | block_start = em->block_start + (start - em->start); |
46bfbb5c CM |
5515 | |
5516 | /* | |
5517 | * we're not going to log anything, but we do need | |
5518 | * to make sure the current transaction stays open | |
5519 | * while we look for nocow cross refs | |
5520 | */ | |
5521 | trans = btrfs_join_transaction(root, 0); | |
3612b495 | 5522 | if (IS_ERR(trans)) |
46bfbb5c CM |
5523 | goto must_cow; |
5524 | ||
5525 | if (can_nocow_odirect(trans, inode, start, len) == 1) { | |
5526 | ret = btrfs_add_ordered_extent_dio(inode, start, | |
5527 | block_start, len, len, type); | |
5528 | btrfs_end_transaction(trans, root); | |
5529 | if (ret) { | |
5530 | free_extent_map(em); | |
5531 | return ret; | |
5532 | } | |
5533 | goto unlock; | |
4b46fce2 | 5534 | } |
46bfbb5c | 5535 | btrfs_end_transaction(trans, root); |
4b46fce2 | 5536 | } |
46bfbb5c CM |
5537 | must_cow: |
5538 | /* | |
5539 | * this will cow the extent, reset the len in case we changed | |
5540 | * it above | |
5541 | */ | |
5542 | len = bh_result->b_size; | |
5543 | free_extent_map(em); | |
5544 | em = btrfs_new_extent_direct(inode, start, len); | |
5545 | if (IS_ERR(em)) | |
5546 | return PTR_ERR(em); | |
5547 | len = min(len, em->len - (start - em->start)); | |
5548 | unlock: | |
4845e44f CM |
5549 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
5550 | EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DIRTY, 1, | |
5551 | 0, NULL, GFP_NOFS); | |
4b46fce2 JB |
5552 | map: |
5553 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> | |
5554 | inode->i_blkbits; | |
46bfbb5c | 5555 | bh_result->b_size = len; |
4b46fce2 JB |
5556 | bh_result->b_bdev = em->bdev; |
5557 | set_buffer_mapped(bh_result); | |
5558 | if (create && !test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
5559 | set_buffer_new(bh_result); | |
5560 | ||
5561 | free_extent_map(em); | |
5562 | ||
5563 | return 0; | |
5564 | } | |
5565 | ||
5566 | struct btrfs_dio_private { | |
5567 | struct inode *inode; | |
5568 | u64 logical_offset; | |
5569 | u64 disk_bytenr; | |
5570 | u64 bytes; | |
5571 | u32 *csums; | |
5572 | void *private; | |
e65e1535 MX |
5573 | |
5574 | /* number of bios pending for this dio */ | |
5575 | atomic_t pending_bios; | |
5576 | ||
5577 | /* IO errors */ | |
5578 | int errors; | |
5579 | ||
5580 | struct bio *orig_bio; | |
4b46fce2 JB |
5581 | }; |
5582 | ||
5583 | static void btrfs_endio_direct_read(struct bio *bio, int err) | |
5584 | { | |
e65e1535 | 5585 | struct btrfs_dio_private *dip = bio->bi_private; |
4b46fce2 JB |
5586 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
5587 | struct bio_vec *bvec = bio->bi_io_vec; | |
4b46fce2 JB |
5588 | struct inode *inode = dip->inode; |
5589 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5590 | u64 start; | |
5591 | u32 *private = dip->csums; | |
5592 | ||
5593 | start = dip->logical_offset; | |
5594 | do { | |
5595 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) { | |
5596 | struct page *page = bvec->bv_page; | |
5597 | char *kaddr; | |
5598 | u32 csum = ~(u32)0; | |
5599 | unsigned long flags; | |
5600 | ||
5601 | local_irq_save(flags); | |
5602 | kaddr = kmap_atomic(page, KM_IRQ0); | |
5603 | csum = btrfs_csum_data(root, kaddr + bvec->bv_offset, | |
5604 | csum, bvec->bv_len); | |
5605 | btrfs_csum_final(csum, (char *)&csum); | |
5606 | kunmap_atomic(kaddr, KM_IRQ0); | |
5607 | local_irq_restore(flags); | |
5608 | ||
5609 | flush_dcache_page(bvec->bv_page); | |
5610 | if (csum != *private) { | |
5611 | printk(KERN_ERR "btrfs csum failed ino %lu off" | |
5612 | " %llu csum %u private %u\n", | |
5613 | inode->i_ino, (unsigned long long)start, | |
5614 | csum, *private); | |
5615 | err = -EIO; | |
5616 | } | |
5617 | } | |
5618 | ||
5619 | start += bvec->bv_len; | |
5620 | private++; | |
5621 | bvec++; | |
5622 | } while (bvec <= bvec_end); | |
5623 | ||
5624 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, | |
5625 | dip->logical_offset + dip->bytes - 1, GFP_NOFS); | |
5626 | bio->bi_private = dip->private; | |
5627 | ||
5628 | kfree(dip->csums); | |
5629 | kfree(dip); | |
5630 | dio_end_io(bio, err); | |
5631 | } | |
5632 | ||
5633 | static void btrfs_endio_direct_write(struct bio *bio, int err) | |
5634 | { | |
5635 | struct btrfs_dio_private *dip = bio->bi_private; | |
5636 | struct inode *inode = dip->inode; | |
5637 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5638 | struct btrfs_trans_handle *trans; | |
5639 | struct btrfs_ordered_extent *ordered = NULL; | |
5640 | struct extent_state *cached_state = NULL; | |
163cf09c CM |
5641 | u64 ordered_offset = dip->logical_offset; |
5642 | u64 ordered_bytes = dip->bytes; | |
4b46fce2 JB |
5643 | int ret; |
5644 | ||
5645 | if (err) | |
5646 | goto out_done; | |
163cf09c CM |
5647 | again: |
5648 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, | |
5649 | &ordered_offset, | |
5650 | ordered_bytes); | |
4b46fce2 | 5651 | if (!ret) |
163cf09c | 5652 | goto out_test; |
4b46fce2 JB |
5653 | |
5654 | BUG_ON(!ordered); | |
5655 | ||
5656 | trans = btrfs_join_transaction(root, 1); | |
3612b495 | 5657 | if (IS_ERR(trans)) { |
4b46fce2 JB |
5658 | err = -ENOMEM; |
5659 | goto out; | |
5660 | } | |
5661 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; | |
5662 | ||
5663 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) { | |
5664 | ret = btrfs_ordered_update_i_size(inode, 0, ordered); | |
5665 | if (!ret) | |
5666 | ret = btrfs_update_inode(trans, root, inode); | |
5667 | err = ret; | |
5668 | goto out; | |
5669 | } | |
5670 | ||
5671 | lock_extent_bits(&BTRFS_I(inode)->io_tree, ordered->file_offset, | |
5672 | ordered->file_offset + ordered->len - 1, 0, | |
5673 | &cached_state, GFP_NOFS); | |
5674 | ||
5675 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) { | |
5676 | ret = btrfs_mark_extent_written(trans, inode, | |
5677 | ordered->file_offset, | |
5678 | ordered->file_offset + | |
5679 | ordered->len); | |
5680 | if (ret) { | |
5681 | err = ret; | |
5682 | goto out_unlock; | |
5683 | } | |
5684 | } else { | |
5685 | ret = insert_reserved_file_extent(trans, inode, | |
5686 | ordered->file_offset, | |
5687 | ordered->start, | |
5688 | ordered->disk_len, | |
5689 | ordered->len, | |
5690 | ordered->len, | |
5691 | 0, 0, 0, | |
5692 | BTRFS_FILE_EXTENT_REG); | |
5693 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, | |
5694 | ordered->file_offset, ordered->len); | |
5695 | if (ret) { | |
5696 | err = ret; | |
5697 | WARN_ON(1); | |
5698 | goto out_unlock; | |
5699 | } | |
5700 | } | |
5701 | ||
5702 | add_pending_csums(trans, inode, ordered->file_offset, &ordered->list); | |
5703 | btrfs_ordered_update_i_size(inode, 0, ordered); | |
5704 | btrfs_update_inode(trans, root, inode); | |
5705 | out_unlock: | |
5706 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, ordered->file_offset, | |
5707 | ordered->file_offset + ordered->len - 1, | |
5708 | &cached_state, GFP_NOFS); | |
5709 | out: | |
5710 | btrfs_delalloc_release_metadata(inode, ordered->len); | |
5711 | btrfs_end_transaction(trans, root); | |
163cf09c | 5712 | ordered_offset = ordered->file_offset + ordered->len; |
4b46fce2 JB |
5713 | btrfs_put_ordered_extent(ordered); |
5714 | btrfs_put_ordered_extent(ordered); | |
163cf09c CM |
5715 | |
5716 | out_test: | |
5717 | /* | |
5718 | * our bio might span multiple ordered extents. If we haven't | |
5719 | * completed the accounting for the whole dio, go back and try again | |
5720 | */ | |
5721 | if (ordered_offset < dip->logical_offset + dip->bytes) { | |
5722 | ordered_bytes = dip->logical_offset + dip->bytes - | |
5723 | ordered_offset; | |
5724 | goto again; | |
5725 | } | |
4b46fce2 JB |
5726 | out_done: |
5727 | bio->bi_private = dip->private; | |
5728 | ||
5729 | kfree(dip->csums); | |
5730 | kfree(dip); | |
5731 | dio_end_io(bio, err); | |
5732 | } | |
5733 | ||
eaf25d93 CM |
5734 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
5735 | struct bio *bio, int mirror_num, | |
5736 | unsigned long bio_flags, u64 offset) | |
5737 | { | |
5738 | int ret; | |
5739 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5740 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); | |
5741 | BUG_ON(ret); | |
5742 | return 0; | |
5743 | } | |
5744 | ||
e65e1535 MX |
5745 | static void btrfs_end_dio_bio(struct bio *bio, int err) |
5746 | { | |
5747 | struct btrfs_dio_private *dip = bio->bi_private; | |
5748 | ||
5749 | if (err) { | |
5750 | printk(KERN_ERR "btrfs direct IO failed ino %lu rw %lu " | |
3dd1462e JB |
5751 | "sector %#Lx len %u err no %d\n", |
5752 | dip->inode->i_ino, bio->bi_rw, | |
5753 | (unsigned long long)bio->bi_sector, bio->bi_size, err); | |
e65e1535 MX |
5754 | dip->errors = 1; |
5755 | ||
5756 | /* | |
5757 | * before atomic variable goto zero, we must make sure | |
5758 | * dip->errors is perceived to be set. | |
5759 | */ | |
5760 | smp_mb__before_atomic_dec(); | |
5761 | } | |
5762 | ||
5763 | /* if there are more bios still pending for this dio, just exit */ | |
5764 | if (!atomic_dec_and_test(&dip->pending_bios)) | |
5765 | goto out; | |
5766 | ||
5767 | if (dip->errors) | |
5768 | bio_io_error(dip->orig_bio); | |
5769 | else { | |
5770 | set_bit(BIO_UPTODATE, &dip->orig_bio->bi_flags); | |
5771 | bio_endio(dip->orig_bio, 0); | |
5772 | } | |
5773 | out: | |
5774 | bio_put(bio); | |
5775 | } | |
5776 | ||
5777 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, | |
5778 | u64 first_sector, gfp_t gfp_flags) | |
5779 | { | |
5780 | int nr_vecs = bio_get_nr_vecs(bdev); | |
5781 | return btrfs_bio_alloc(bdev, first_sector, nr_vecs, gfp_flags); | |
5782 | } | |
5783 | ||
5784 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, | |
5785 | int rw, u64 file_offset, int skip_sum, | |
5786 | u32 *csums) | |
5787 | { | |
5788 | int write = rw & REQ_WRITE; | |
5789 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5790 | int ret; | |
5791 | ||
5792 | bio_get(bio); | |
5793 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); | |
5794 | if (ret) | |
5795 | goto err; | |
5796 | ||
5797 | if (write && !skip_sum) { | |
5798 | ret = btrfs_wq_submit_bio(root->fs_info, | |
5799 | inode, rw, bio, 0, 0, | |
5800 | file_offset, | |
5801 | __btrfs_submit_bio_start_direct_io, | |
5802 | __btrfs_submit_bio_done); | |
5803 | goto err; | |
5804 | } else if (!skip_sum) | |
5805 | btrfs_lookup_bio_sums_dio(root, inode, bio, | |
5806 | file_offset, csums); | |
5807 | ||
5808 | ret = btrfs_map_bio(root, rw, bio, 0, 1); | |
5809 | err: | |
5810 | bio_put(bio); | |
5811 | return ret; | |
5812 | } | |
5813 | ||
5814 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, | |
5815 | int skip_sum) | |
5816 | { | |
5817 | struct inode *inode = dip->inode; | |
5818 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5819 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; | |
5820 | struct bio *bio; | |
5821 | struct bio *orig_bio = dip->orig_bio; | |
5822 | struct bio_vec *bvec = orig_bio->bi_io_vec; | |
5823 | u64 start_sector = orig_bio->bi_sector; | |
5824 | u64 file_offset = dip->logical_offset; | |
5825 | u64 submit_len = 0; | |
5826 | u64 map_length; | |
5827 | int nr_pages = 0; | |
5828 | u32 *csums = dip->csums; | |
5829 | int ret = 0; | |
5830 | ||
5831 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); | |
5832 | if (!bio) | |
5833 | return -ENOMEM; | |
5834 | bio->bi_private = dip; | |
5835 | bio->bi_end_io = btrfs_end_dio_bio; | |
5836 | atomic_inc(&dip->pending_bios); | |
5837 | ||
5838 | map_length = orig_bio->bi_size; | |
5839 | ret = btrfs_map_block(map_tree, READ, start_sector << 9, | |
5840 | &map_length, NULL, 0); | |
5841 | if (ret) { | |
5842 | bio_put(bio); | |
5843 | return -EIO; | |
5844 | } | |
5845 | ||
5846 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { | |
5847 | if (unlikely(map_length < submit_len + bvec->bv_len || | |
5848 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, | |
5849 | bvec->bv_offset) < bvec->bv_len)) { | |
5850 | /* | |
5851 | * inc the count before we submit the bio so | |
5852 | * we know the end IO handler won't happen before | |
5853 | * we inc the count. Otherwise, the dip might get freed | |
5854 | * before we're done setting it up | |
5855 | */ | |
5856 | atomic_inc(&dip->pending_bios); | |
5857 | ret = __btrfs_submit_dio_bio(bio, inode, rw, | |
5858 | file_offset, skip_sum, | |
5859 | csums); | |
5860 | if (ret) { | |
5861 | bio_put(bio); | |
5862 | atomic_dec(&dip->pending_bios); | |
5863 | goto out_err; | |
5864 | } | |
5865 | ||
5866 | if (!skip_sum) | |
5867 | csums = csums + nr_pages; | |
5868 | start_sector += submit_len >> 9; | |
5869 | file_offset += submit_len; | |
5870 | ||
5871 | submit_len = 0; | |
5872 | nr_pages = 0; | |
5873 | ||
5874 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, | |
5875 | start_sector, GFP_NOFS); | |
5876 | if (!bio) | |
5877 | goto out_err; | |
5878 | bio->bi_private = dip; | |
5879 | bio->bi_end_io = btrfs_end_dio_bio; | |
5880 | ||
5881 | map_length = orig_bio->bi_size; | |
5882 | ret = btrfs_map_block(map_tree, READ, start_sector << 9, | |
5883 | &map_length, NULL, 0); | |
5884 | if (ret) { | |
5885 | bio_put(bio); | |
5886 | goto out_err; | |
5887 | } | |
5888 | } else { | |
5889 | submit_len += bvec->bv_len; | |
5890 | nr_pages ++; | |
5891 | bvec++; | |
5892 | } | |
5893 | } | |
5894 | ||
5895 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, | |
5896 | csums); | |
5897 | if (!ret) | |
5898 | return 0; | |
5899 | ||
5900 | bio_put(bio); | |
5901 | out_err: | |
5902 | dip->errors = 1; | |
5903 | /* | |
5904 | * before atomic variable goto zero, we must | |
5905 | * make sure dip->errors is perceived to be set. | |
5906 | */ | |
5907 | smp_mb__before_atomic_dec(); | |
5908 | if (atomic_dec_and_test(&dip->pending_bios)) | |
5909 | bio_io_error(dip->orig_bio); | |
5910 | ||
5911 | /* bio_end_io() will handle error, so we needn't return it */ | |
5912 | return 0; | |
5913 | } | |
5914 | ||
4b46fce2 JB |
5915 | static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode, |
5916 | loff_t file_offset) | |
5917 | { | |
5918 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5919 | struct btrfs_dio_private *dip; | |
5920 | struct bio_vec *bvec = bio->bi_io_vec; | |
4b46fce2 | 5921 | int skip_sum; |
7b6d91da | 5922 | int write = rw & REQ_WRITE; |
4b46fce2 JB |
5923 | int ret = 0; |
5924 | ||
5925 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
5926 | ||
5927 | dip = kmalloc(sizeof(*dip), GFP_NOFS); | |
5928 | if (!dip) { | |
5929 | ret = -ENOMEM; | |
5930 | goto free_ordered; | |
5931 | } | |
5932 | dip->csums = NULL; | |
5933 | ||
5934 | if (!skip_sum) { | |
5935 | dip->csums = kmalloc(sizeof(u32) * bio->bi_vcnt, GFP_NOFS); | |
5936 | if (!dip->csums) { | |
5937 | ret = -ENOMEM; | |
5938 | goto free_ordered; | |
5939 | } | |
5940 | } | |
5941 | ||
5942 | dip->private = bio->bi_private; | |
5943 | dip->inode = inode; | |
5944 | dip->logical_offset = file_offset; | |
5945 | ||
4b46fce2 JB |
5946 | dip->bytes = 0; |
5947 | do { | |
5948 | dip->bytes += bvec->bv_len; | |
5949 | bvec++; | |
5950 | } while (bvec <= (bio->bi_io_vec + bio->bi_vcnt - 1)); | |
5951 | ||
46bfbb5c | 5952 | dip->disk_bytenr = (u64)bio->bi_sector << 9; |
4b46fce2 | 5953 | bio->bi_private = dip; |
e65e1535 MX |
5954 | dip->errors = 0; |
5955 | dip->orig_bio = bio; | |
5956 | atomic_set(&dip->pending_bios, 0); | |
4b46fce2 JB |
5957 | |
5958 | if (write) | |
5959 | bio->bi_end_io = btrfs_endio_direct_write; | |
5960 | else | |
5961 | bio->bi_end_io = btrfs_endio_direct_read; | |
5962 | ||
e65e1535 MX |
5963 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
5964 | if (!ret) | |
eaf25d93 | 5965 | return; |
4b46fce2 JB |
5966 | free_ordered: |
5967 | /* | |
5968 | * If this is a write, we need to clean up the reserved space and kill | |
5969 | * the ordered extent. | |
5970 | */ | |
5971 | if (write) { | |
5972 | struct btrfs_ordered_extent *ordered; | |
955256f2 | 5973 | ordered = btrfs_lookup_ordered_extent(inode, file_offset); |
4b46fce2 JB |
5974 | if (!test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags) && |
5975 | !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) | |
5976 | btrfs_free_reserved_extent(root, ordered->start, | |
5977 | ordered->disk_len); | |
5978 | btrfs_put_ordered_extent(ordered); | |
5979 | btrfs_put_ordered_extent(ordered); | |
5980 | } | |
5981 | bio_endio(bio, ret); | |
5982 | } | |
5983 | ||
5a5f79b5 CM |
5984 | static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb, |
5985 | const struct iovec *iov, loff_t offset, | |
5986 | unsigned long nr_segs) | |
5987 | { | |
5988 | int seg; | |
5989 | size_t size; | |
5990 | unsigned long addr; | |
5991 | unsigned blocksize_mask = root->sectorsize - 1; | |
5992 | ssize_t retval = -EINVAL; | |
5993 | loff_t end = offset; | |
5994 | ||
5995 | if (offset & blocksize_mask) | |
5996 | goto out; | |
5997 | ||
5998 | /* Check the memory alignment. Blocks cannot straddle pages */ | |
5999 | for (seg = 0; seg < nr_segs; seg++) { | |
6000 | addr = (unsigned long)iov[seg].iov_base; | |
6001 | size = iov[seg].iov_len; | |
6002 | end += size; | |
6003 | if ((addr & blocksize_mask) || (size & blocksize_mask)) | |
6004 | goto out; | |
6005 | } | |
6006 | retval = 0; | |
6007 | out: | |
6008 | return retval; | |
6009 | } | |
16432985 CM |
6010 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, |
6011 | const struct iovec *iov, loff_t offset, | |
6012 | unsigned long nr_segs) | |
6013 | { | |
4b46fce2 JB |
6014 | struct file *file = iocb->ki_filp; |
6015 | struct inode *inode = file->f_mapping->host; | |
6016 | struct btrfs_ordered_extent *ordered; | |
4845e44f | 6017 | struct extent_state *cached_state = NULL; |
4b46fce2 JB |
6018 | u64 lockstart, lockend; |
6019 | ssize_t ret; | |
4845e44f CM |
6020 | int writing = rw & WRITE; |
6021 | int write_bits = 0; | |
3f7c579c | 6022 | size_t count = iov_length(iov, nr_segs); |
4b46fce2 | 6023 | |
5a5f79b5 CM |
6024 | if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov, |
6025 | offset, nr_segs)) { | |
6026 | return 0; | |
6027 | } | |
6028 | ||
4b46fce2 | 6029 | lockstart = offset; |
3f7c579c CM |
6030 | lockend = offset + count - 1; |
6031 | ||
6032 | if (writing) { | |
6033 | ret = btrfs_delalloc_reserve_space(inode, count); | |
6034 | if (ret) | |
6035 | goto out; | |
6036 | } | |
4845e44f | 6037 | |
4b46fce2 | 6038 | while (1) { |
4845e44f CM |
6039 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
6040 | 0, &cached_state, GFP_NOFS); | |
4b46fce2 JB |
6041 | /* |
6042 | * We're concerned with the entire range that we're going to be | |
6043 | * doing DIO to, so we need to make sure theres no ordered | |
6044 | * extents in this range. | |
6045 | */ | |
6046 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
6047 | lockend - lockstart + 1); | |
6048 | if (!ordered) | |
6049 | break; | |
4845e44f CM |
6050 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
6051 | &cached_state, GFP_NOFS); | |
4b46fce2 JB |
6052 | btrfs_start_ordered_extent(inode, ordered, 1); |
6053 | btrfs_put_ordered_extent(ordered); | |
6054 | cond_resched(); | |
6055 | } | |
6056 | ||
4845e44f CM |
6057 | /* |
6058 | * we don't use btrfs_set_extent_delalloc because we don't want | |
6059 | * the dirty or uptodate bits | |
6060 | */ | |
6061 | if (writing) { | |
6062 | write_bits = EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING; | |
6063 | ret = set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
6064 | EXTENT_DELALLOC, 0, NULL, &cached_state, | |
6065 | GFP_NOFS); | |
6066 | if (ret) { | |
6067 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
6068 | lockend, EXTENT_LOCKED | write_bits, | |
6069 | 1, 0, &cached_state, GFP_NOFS); | |
6070 | goto out; | |
6071 | } | |
6072 | } | |
6073 | ||
6074 | free_extent_state(cached_state); | |
6075 | cached_state = NULL; | |
6076 | ||
5a5f79b5 CM |
6077 | ret = __blockdev_direct_IO(rw, iocb, inode, |
6078 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, | |
6079 | iov, offset, nr_segs, btrfs_get_blocks_direct, NULL, | |
6080 | btrfs_submit_direct, 0); | |
4b46fce2 JB |
6081 | |
6082 | if (ret < 0 && ret != -EIOCBQUEUED) { | |
4845e44f CM |
6083 | clear_extent_bit(&BTRFS_I(inode)->io_tree, offset, |
6084 | offset + iov_length(iov, nr_segs) - 1, | |
6085 | EXTENT_LOCKED | write_bits, 1, 0, | |
6086 | &cached_state, GFP_NOFS); | |
4b46fce2 JB |
6087 | } else if (ret >= 0 && ret < iov_length(iov, nr_segs)) { |
6088 | /* | |
6089 | * We're falling back to buffered, unlock the section we didn't | |
6090 | * do IO on. | |
6091 | */ | |
4845e44f CM |
6092 | clear_extent_bit(&BTRFS_I(inode)->io_tree, offset + ret, |
6093 | offset + iov_length(iov, nr_segs) - 1, | |
6094 | EXTENT_LOCKED | write_bits, 1, 0, | |
6095 | &cached_state, GFP_NOFS); | |
4b46fce2 | 6096 | } |
4845e44f CM |
6097 | out: |
6098 | free_extent_state(cached_state); | |
4b46fce2 | 6099 | return ret; |
16432985 CM |
6100 | } |
6101 | ||
1506fcc8 YS |
6102 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
6103 | __u64 start, __u64 len) | |
6104 | { | |
6105 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent); | |
6106 | } | |
6107 | ||
a52d9a80 | 6108 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 6109 | { |
d1310b2e CM |
6110 | struct extent_io_tree *tree; |
6111 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 6112 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 6113 | } |
1832a6d5 | 6114 | |
a52d9a80 | 6115 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 6116 | { |
d1310b2e | 6117 | struct extent_io_tree *tree; |
b888db2b CM |
6118 | |
6119 | ||
6120 | if (current->flags & PF_MEMALLOC) { | |
6121 | redirty_page_for_writepage(wbc, page); | |
6122 | unlock_page(page); | |
6123 | return 0; | |
6124 | } | |
d1310b2e | 6125 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 6126 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
6127 | } |
6128 | ||
f421950f CM |
6129 | int btrfs_writepages(struct address_space *mapping, |
6130 | struct writeback_control *wbc) | |
b293f02e | 6131 | { |
d1310b2e | 6132 | struct extent_io_tree *tree; |
771ed689 | 6133 | |
d1310b2e | 6134 | tree = &BTRFS_I(mapping->host)->io_tree; |
b293f02e CM |
6135 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
6136 | } | |
6137 | ||
3ab2fb5a CM |
6138 | static int |
6139 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
6140 | struct list_head *pages, unsigned nr_pages) | |
6141 | { | |
d1310b2e CM |
6142 | struct extent_io_tree *tree; |
6143 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
6144 | return extent_readpages(tree, mapping, pages, nr_pages, |
6145 | btrfs_get_extent); | |
6146 | } | |
e6dcd2dc | 6147 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 6148 | { |
d1310b2e CM |
6149 | struct extent_io_tree *tree; |
6150 | struct extent_map_tree *map; | |
a52d9a80 | 6151 | int ret; |
8c2383c3 | 6152 | |
d1310b2e CM |
6153 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
6154 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 6155 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
6156 | if (ret == 1) { |
6157 | ClearPagePrivate(page); | |
6158 | set_page_private(page, 0); | |
6159 | page_cache_release(page); | |
39279cc3 | 6160 | } |
a52d9a80 | 6161 | return ret; |
39279cc3 CM |
6162 | } |
6163 | ||
e6dcd2dc CM |
6164 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
6165 | { | |
98509cfc CM |
6166 | if (PageWriteback(page) || PageDirty(page)) |
6167 | return 0; | |
b335b003 | 6168 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
e6dcd2dc CM |
6169 | } |
6170 | ||
a52d9a80 | 6171 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 6172 | { |
d1310b2e | 6173 | struct extent_io_tree *tree; |
e6dcd2dc | 6174 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 6175 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
6176 | u64 page_start = page_offset(page); |
6177 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
39279cc3 | 6178 | |
8b62b72b CM |
6179 | |
6180 | /* | |
6181 | * we have the page locked, so new writeback can't start, | |
6182 | * and the dirty bit won't be cleared while we are here. | |
6183 | * | |
6184 | * Wait for IO on this page so that we can safely clear | |
6185 | * the PagePrivate2 bit and do ordered accounting | |
6186 | */ | |
e6dcd2dc | 6187 | wait_on_page_writeback(page); |
8b62b72b | 6188 | |
d1310b2e | 6189 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
e6dcd2dc CM |
6190 | if (offset) { |
6191 | btrfs_releasepage(page, GFP_NOFS); | |
6192 | return; | |
6193 | } | |
2ac55d41 JB |
6194 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state, |
6195 | GFP_NOFS); | |
e6dcd2dc CM |
6196 | ordered = btrfs_lookup_ordered_extent(page->mapping->host, |
6197 | page_offset(page)); | |
6198 | if (ordered) { | |
eb84ae03 CM |
6199 | /* |
6200 | * IO on this page will never be started, so we need | |
6201 | * to account for any ordered extents now | |
6202 | */ | |
e6dcd2dc CM |
6203 | clear_extent_bit(tree, page_start, page_end, |
6204 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
32c00aff | 6205 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING, 1, 0, |
2ac55d41 | 6206 | &cached_state, GFP_NOFS); |
8b62b72b CM |
6207 | /* |
6208 | * whoever cleared the private bit is responsible | |
6209 | * for the finish_ordered_io | |
6210 | */ | |
6211 | if (TestClearPagePrivate2(page)) { | |
6212 | btrfs_finish_ordered_io(page->mapping->host, | |
6213 | page_start, page_end); | |
6214 | } | |
e6dcd2dc | 6215 | btrfs_put_ordered_extent(ordered); |
2ac55d41 JB |
6216 | cached_state = NULL; |
6217 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state, | |
6218 | GFP_NOFS); | |
e6dcd2dc CM |
6219 | } |
6220 | clear_extent_bit(tree, page_start, page_end, | |
32c00aff | 6221 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
2ac55d41 | 6222 | EXTENT_DO_ACCOUNTING, 1, 1, &cached_state, GFP_NOFS); |
e6dcd2dc CM |
6223 | __btrfs_releasepage(page, GFP_NOFS); |
6224 | ||
4a096752 | 6225 | ClearPageChecked(page); |
9ad6b7bc | 6226 | if (PagePrivate(page)) { |
9ad6b7bc CM |
6227 | ClearPagePrivate(page); |
6228 | set_page_private(page, 0); | |
6229 | page_cache_release(page); | |
6230 | } | |
39279cc3 CM |
6231 | } |
6232 | ||
9ebefb18 CM |
6233 | /* |
6234 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
6235 | * called from a page fault handler when a page is first dirtied. Hence we must | |
6236 | * be careful to check for EOF conditions here. We set the page up correctly | |
6237 | * for a written page which means we get ENOSPC checking when writing into | |
6238 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
6239 | * support these features. | |
6240 | * | |
6241 | * We are not allowed to take the i_mutex here so we have to play games to | |
6242 | * protect against truncate races as the page could now be beyond EOF. Because | |
6243 | * vmtruncate() writes the inode size before removing pages, once we have the | |
6244 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
6245 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
6246 | * unlock the page. | |
6247 | */ | |
c2ec175c | 6248 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
9ebefb18 | 6249 | { |
c2ec175c | 6250 | struct page *page = vmf->page; |
6da6abae | 6251 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 6252 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
6253 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
6254 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 6255 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
6256 | char *kaddr; |
6257 | unsigned long zero_start; | |
9ebefb18 | 6258 | loff_t size; |
1832a6d5 | 6259 | int ret; |
a52d9a80 | 6260 | u64 page_start; |
e6dcd2dc | 6261 | u64 page_end; |
9ebefb18 | 6262 | |
0ca1f7ce | 6263 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
56a76f82 NP |
6264 | if (ret) { |
6265 | if (ret == -ENOMEM) | |
6266 | ret = VM_FAULT_OOM; | |
6267 | else /* -ENOSPC, -EIO, etc */ | |
6268 | ret = VM_FAULT_SIGBUS; | |
1832a6d5 | 6269 | goto out; |
56a76f82 | 6270 | } |
1832a6d5 | 6271 | |
56a76f82 | 6272 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
e6dcd2dc | 6273 | again: |
9ebefb18 | 6274 | lock_page(page); |
9ebefb18 | 6275 | size = i_size_read(inode); |
e6dcd2dc CM |
6276 | page_start = page_offset(page); |
6277 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
a52d9a80 | 6278 | |
9ebefb18 | 6279 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 6280 | (page_start >= size)) { |
9ebefb18 CM |
6281 | /* page got truncated out from underneath us */ |
6282 | goto out_unlock; | |
6283 | } | |
e6dcd2dc CM |
6284 | wait_on_page_writeback(page); |
6285 | ||
2ac55d41 JB |
6286 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state, |
6287 | GFP_NOFS); | |
e6dcd2dc CM |
6288 | set_page_extent_mapped(page); |
6289 | ||
eb84ae03 CM |
6290 | /* |
6291 | * we can't set the delalloc bits if there are pending ordered | |
6292 | * extents. Drop our locks and wait for them to finish | |
6293 | */ | |
e6dcd2dc CM |
6294 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
6295 | if (ordered) { | |
2ac55d41 JB |
6296 | unlock_extent_cached(io_tree, page_start, page_end, |
6297 | &cached_state, GFP_NOFS); | |
e6dcd2dc | 6298 | unlock_page(page); |
eb84ae03 | 6299 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
6300 | btrfs_put_ordered_extent(ordered); |
6301 | goto again; | |
6302 | } | |
6303 | ||
fbf19087 JB |
6304 | /* |
6305 | * XXX - page_mkwrite gets called every time the page is dirtied, even | |
6306 | * if it was already dirty, so for space accounting reasons we need to | |
6307 | * clear any delalloc bits for the range we are fixing to save. There | |
6308 | * is probably a better way to do this, but for now keep consistent with | |
6309 | * prepare_pages in the normal write path. | |
6310 | */ | |
2ac55d41 | 6311 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
32c00aff | 6312 | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
2ac55d41 | 6313 | 0, 0, &cached_state, GFP_NOFS); |
fbf19087 | 6314 | |
2ac55d41 JB |
6315 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
6316 | &cached_state); | |
9ed74f2d | 6317 | if (ret) { |
2ac55d41 JB |
6318 | unlock_extent_cached(io_tree, page_start, page_end, |
6319 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
6320 | ret = VM_FAULT_SIGBUS; |
6321 | goto out_unlock; | |
6322 | } | |
e6dcd2dc | 6323 | ret = 0; |
9ebefb18 CM |
6324 | |
6325 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 6326 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 6327 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 6328 | else |
e6dcd2dc | 6329 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 6330 | |
e6dcd2dc CM |
6331 | if (zero_start != PAGE_CACHE_SIZE) { |
6332 | kaddr = kmap(page); | |
6333 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
6334 | flush_dcache_page(page); | |
6335 | kunmap(page); | |
6336 | } | |
247e743c | 6337 | ClearPageChecked(page); |
e6dcd2dc | 6338 | set_page_dirty(page); |
50a9b214 | 6339 | SetPageUptodate(page); |
5a3f23d5 | 6340 | |
257c62e1 CM |
6341 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
6342 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; | |
6343 | ||
2ac55d41 | 6344 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS); |
9ebefb18 CM |
6345 | |
6346 | out_unlock: | |
50a9b214 CM |
6347 | if (!ret) |
6348 | return VM_FAULT_LOCKED; | |
9ebefb18 | 6349 | unlock_page(page); |
0ca1f7ce | 6350 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
1832a6d5 | 6351 | out: |
9ebefb18 CM |
6352 | return ret; |
6353 | } | |
6354 | ||
39279cc3 CM |
6355 | static void btrfs_truncate(struct inode *inode) |
6356 | { | |
6357 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
6358 | int ret; | |
6359 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 6360 | unsigned long nr; |
dbe674a9 | 6361 | u64 mask = root->sectorsize - 1; |
39279cc3 | 6362 | |
8082510e YZ |
6363 | if (!S_ISREG(inode->i_mode)) { |
6364 | WARN_ON(1); | |
39279cc3 | 6365 | return; |
8082510e | 6366 | } |
39279cc3 | 6367 | |
5d5e103a JB |
6368 | ret = btrfs_truncate_page(inode->i_mapping, inode->i_size); |
6369 | if (ret) | |
6370 | return; | |
8082510e | 6371 | |
4a096752 | 6372 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
8082510e | 6373 | btrfs_ordered_update_i_size(inode, inode->i_size, NULL); |
39279cc3 | 6374 | |
d68fc57b YZ |
6375 | trans = btrfs_start_transaction(root, 0); |
6376 | BUG_ON(IS_ERR(trans)); | |
8082510e | 6377 | btrfs_set_trans_block_group(trans, inode); |
d68fc57b | 6378 | trans->block_rsv = root->orphan_block_rsv; |
5a3f23d5 CM |
6379 | |
6380 | /* | |
6381 | * setattr is responsible for setting the ordered_data_close flag, | |
6382 | * but that is only tested during the last file release. That | |
6383 | * could happen well after the next commit, leaving a great big | |
6384 | * window where new writes may get lost if someone chooses to write | |
6385 | * to this file after truncating to zero | |
6386 | * | |
6387 | * The inode doesn't have any dirty data here, and so if we commit | |
6388 | * this is a noop. If someone immediately starts writing to the inode | |
6389 | * it is very likely we'll catch some of their writes in this | |
6390 | * transaction, and the commit will find this file on the ordered | |
6391 | * data list with good things to send down. | |
6392 | * | |
6393 | * This is a best effort solution, there is still a window where | |
6394 | * using truncate to replace the contents of the file will | |
6395 | * end up with a zero length file after a crash. | |
6396 | */ | |
6397 | if (inode->i_size == 0 && BTRFS_I(inode)->ordered_data_close) | |
6398 | btrfs_add_ordered_operation(trans, root, inode); | |
6399 | ||
8082510e | 6400 | while (1) { |
d68fc57b YZ |
6401 | if (!trans) { |
6402 | trans = btrfs_start_transaction(root, 0); | |
6403 | BUG_ON(IS_ERR(trans)); | |
6404 | btrfs_set_trans_block_group(trans, inode); | |
6405 | trans->block_rsv = root->orphan_block_rsv; | |
6406 | } | |
6407 | ||
6408 | ret = btrfs_block_rsv_check(trans, root, | |
6409 | root->orphan_block_rsv, 0, 5); | |
6410 | if (ret) { | |
6411 | BUG_ON(ret != -EAGAIN); | |
6412 | ret = btrfs_commit_transaction(trans, root); | |
6413 | BUG_ON(ret); | |
6414 | trans = NULL; | |
6415 | continue; | |
6416 | } | |
6417 | ||
8082510e YZ |
6418 | ret = btrfs_truncate_inode_items(trans, root, inode, |
6419 | inode->i_size, | |
6420 | BTRFS_EXTENT_DATA_KEY); | |
6421 | if (ret != -EAGAIN) | |
6422 | break; | |
39279cc3 | 6423 | |
8082510e YZ |
6424 | ret = btrfs_update_inode(trans, root, inode); |
6425 | BUG_ON(ret); | |
5f39d397 | 6426 | |
8082510e YZ |
6427 | nr = trans->blocks_used; |
6428 | btrfs_end_transaction(trans, root); | |
d68fc57b | 6429 | trans = NULL; |
8082510e | 6430 | btrfs_btree_balance_dirty(root, nr); |
8082510e YZ |
6431 | } |
6432 | ||
6433 | if (ret == 0 && inode->i_nlink > 0) { | |
6434 | ret = btrfs_orphan_del(trans, inode); | |
6435 | BUG_ON(ret); | |
6436 | } | |
6437 | ||
6438 | ret = btrfs_update_inode(trans, root, inode); | |
7b128766 JB |
6439 | BUG_ON(ret); |
6440 | ||
7b128766 | 6441 | nr = trans->blocks_used; |
89ce8a63 | 6442 | ret = btrfs_end_transaction_throttle(trans, root); |
39279cc3 | 6443 | BUG_ON(ret); |
d3c2fdcf | 6444 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
6445 | } |
6446 | ||
d352ac68 CM |
6447 | /* |
6448 | * create a new subvolume directory/inode (helper for the ioctl). | |
6449 | */ | |
d2fb3437 | 6450 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
76dda93c | 6451 | struct btrfs_root *new_root, |
d2fb3437 | 6452 | u64 new_dirid, u64 alloc_hint) |
39279cc3 | 6453 | { |
39279cc3 | 6454 | struct inode *inode; |
76dda93c | 6455 | int err; |
00e4e6b3 | 6456 | u64 index = 0; |
39279cc3 | 6457 | |
aec7477b | 6458 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid, |
d2fb3437 | 6459 | new_dirid, alloc_hint, S_IFDIR | 0700, &index); |
54aa1f4d | 6460 | if (IS_ERR(inode)) |
f46b5a66 | 6461 | return PTR_ERR(inode); |
39279cc3 CM |
6462 | inode->i_op = &btrfs_dir_inode_operations; |
6463 | inode->i_fop = &btrfs_dir_file_operations; | |
6464 | ||
39279cc3 | 6465 | inode->i_nlink = 1; |
dbe674a9 | 6466 | btrfs_i_size_write(inode, 0); |
3b96362c | 6467 | |
76dda93c YZ |
6468 | err = btrfs_update_inode(trans, new_root, inode); |
6469 | BUG_ON(err); | |
cb8e7090 | 6470 | |
76dda93c | 6471 | iput(inode); |
cb8e7090 | 6472 | return 0; |
39279cc3 CM |
6473 | } |
6474 | ||
d352ac68 CM |
6475 | /* helper function for file defrag and space balancing. This |
6476 | * forces readahead on a given range of bytes in an inode | |
6477 | */ | |
edbd8d4e | 6478 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
6479 | struct file_ra_state *ra, struct file *file, |
6480 | pgoff_t offset, pgoff_t last_index) | |
6481 | { | |
8e7bf94f | 6482 | pgoff_t req_size = last_index - offset + 1; |
86479a04 | 6483 | |
86479a04 CM |
6484 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
6485 | return offset + req_size; | |
86479a04 CM |
6486 | } |
6487 | ||
39279cc3 CM |
6488 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
6489 | { | |
6490 | struct btrfs_inode *ei; | |
2ead6ae7 | 6491 | struct inode *inode; |
39279cc3 CM |
6492 | |
6493 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
6494 | if (!ei) | |
6495 | return NULL; | |
2ead6ae7 YZ |
6496 | |
6497 | ei->root = NULL; | |
6498 | ei->space_info = NULL; | |
6499 | ei->generation = 0; | |
6500 | ei->sequence = 0; | |
15ee9bc7 | 6501 | ei->last_trans = 0; |
257c62e1 | 6502 | ei->last_sub_trans = 0; |
e02119d5 | 6503 | ei->logged_trans = 0; |
2ead6ae7 YZ |
6504 | ei->delalloc_bytes = 0; |
6505 | ei->reserved_bytes = 0; | |
6506 | ei->disk_i_size = 0; | |
6507 | ei->flags = 0; | |
6508 | ei->index_cnt = (u64)-1; | |
6509 | ei->last_unlink_trans = 0; | |
6510 | ||
32c00aff | 6511 | spin_lock_init(&ei->accounting_lock); |
0ca1f7ce | 6512 | atomic_set(&ei->outstanding_extents, 0); |
32c00aff | 6513 | ei->reserved_extents = 0; |
2ead6ae7 YZ |
6514 | |
6515 | ei->ordered_data_close = 0; | |
d68fc57b | 6516 | ei->orphan_meta_reserved = 0; |
2ead6ae7 | 6517 | ei->dummy_inode = 0; |
261507a0 | 6518 | ei->force_compress = BTRFS_COMPRESS_NONE; |
2ead6ae7 YZ |
6519 | |
6520 | inode = &ei->vfs_inode; | |
6521 | extent_map_tree_init(&ei->extent_tree, GFP_NOFS); | |
6522 | extent_io_tree_init(&ei->io_tree, &inode->i_data, GFP_NOFS); | |
6523 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data, GFP_NOFS); | |
6524 | mutex_init(&ei->log_mutex); | |
e6dcd2dc | 6525 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
7b128766 | 6526 | INIT_LIST_HEAD(&ei->i_orphan); |
2ead6ae7 | 6527 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
5a3f23d5 | 6528 | INIT_LIST_HEAD(&ei->ordered_operations); |
2ead6ae7 YZ |
6529 | RB_CLEAR_NODE(&ei->rb_node); |
6530 | ||
6531 | return inode; | |
39279cc3 CM |
6532 | } |
6533 | ||
fa0d7e3d NP |
6534 | static void btrfs_i_callback(struct rcu_head *head) |
6535 | { | |
6536 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
6537 | INIT_LIST_HEAD(&inode->i_dentry); | |
6538 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
6539 | } | |
6540 | ||
39279cc3 CM |
6541 | void btrfs_destroy_inode(struct inode *inode) |
6542 | { | |
e6dcd2dc | 6543 | struct btrfs_ordered_extent *ordered; |
5a3f23d5 CM |
6544 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6545 | ||
39279cc3 CM |
6546 | WARN_ON(!list_empty(&inode->i_dentry)); |
6547 | WARN_ON(inode->i_data.nrpages); | |
0ca1f7ce YZ |
6548 | WARN_ON(atomic_read(&BTRFS_I(inode)->outstanding_extents)); |
6549 | WARN_ON(BTRFS_I(inode)->reserved_extents); | |
39279cc3 | 6550 | |
a6dbd429 JB |
6551 | /* |
6552 | * This can happen where we create an inode, but somebody else also | |
6553 | * created the same inode and we need to destroy the one we already | |
6554 | * created. | |
6555 | */ | |
6556 | if (!root) | |
6557 | goto free; | |
6558 | ||
5a3f23d5 CM |
6559 | /* |
6560 | * Make sure we're properly removed from the ordered operation | |
6561 | * lists. | |
6562 | */ | |
6563 | smp_mb(); | |
6564 | if (!list_empty(&BTRFS_I(inode)->ordered_operations)) { | |
6565 | spin_lock(&root->fs_info->ordered_extent_lock); | |
6566 | list_del_init(&BTRFS_I(inode)->ordered_operations); | |
6567 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
6568 | } | |
6569 | ||
0af3d00b JB |
6570 | if (root == root->fs_info->tree_root) { |
6571 | struct btrfs_block_group_cache *block_group; | |
6572 | ||
6573 | block_group = btrfs_lookup_block_group(root->fs_info, | |
6574 | BTRFS_I(inode)->block_group); | |
6575 | if (block_group && block_group->inode == inode) { | |
6576 | spin_lock(&block_group->lock); | |
6577 | block_group->inode = NULL; | |
6578 | spin_unlock(&block_group->lock); | |
6579 | btrfs_put_block_group(block_group); | |
6580 | } else if (block_group) { | |
6581 | btrfs_put_block_group(block_group); | |
6582 | } | |
6583 | } | |
6584 | ||
d68fc57b | 6585 | spin_lock(&root->orphan_lock); |
7b128766 | 6586 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { |
8082510e YZ |
6587 | printk(KERN_INFO "BTRFS: inode %lu still on the orphan list\n", |
6588 | inode->i_ino); | |
6589 | list_del_init(&BTRFS_I(inode)->i_orphan); | |
7b128766 | 6590 | } |
d68fc57b | 6591 | spin_unlock(&root->orphan_lock); |
7b128766 | 6592 | |
d397712b | 6593 | while (1) { |
e6dcd2dc CM |
6594 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
6595 | if (!ordered) | |
6596 | break; | |
6597 | else { | |
d397712b CM |
6598 | printk(KERN_ERR "btrfs found ordered " |
6599 | "extent %llu %llu on inode cleanup\n", | |
6600 | (unsigned long long)ordered->file_offset, | |
6601 | (unsigned long long)ordered->len); | |
e6dcd2dc CM |
6602 | btrfs_remove_ordered_extent(inode, ordered); |
6603 | btrfs_put_ordered_extent(ordered); | |
6604 | btrfs_put_ordered_extent(ordered); | |
6605 | } | |
6606 | } | |
5d4f98a2 | 6607 | inode_tree_del(inode); |
5b21f2ed | 6608 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
a6dbd429 | 6609 | free: |
fa0d7e3d | 6610 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
39279cc3 CM |
6611 | } |
6612 | ||
45321ac5 | 6613 | int btrfs_drop_inode(struct inode *inode) |
76dda93c YZ |
6614 | { |
6615 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
45321ac5 | 6616 | |
0af3d00b JB |
6617 | if (btrfs_root_refs(&root->root_item) == 0 && |
6618 | root != root->fs_info->tree_root) | |
45321ac5 | 6619 | return 1; |
76dda93c | 6620 | else |
45321ac5 | 6621 | return generic_drop_inode(inode); |
76dda93c YZ |
6622 | } |
6623 | ||
0ee0fda0 | 6624 | static void init_once(void *foo) |
39279cc3 CM |
6625 | { |
6626 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
6627 | ||
6628 | inode_init_once(&ei->vfs_inode); | |
6629 | } | |
6630 | ||
6631 | void btrfs_destroy_cachep(void) | |
6632 | { | |
6633 | if (btrfs_inode_cachep) | |
6634 | kmem_cache_destroy(btrfs_inode_cachep); | |
6635 | if (btrfs_trans_handle_cachep) | |
6636 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
6637 | if (btrfs_transaction_cachep) | |
6638 | kmem_cache_destroy(btrfs_transaction_cachep); | |
39279cc3 CM |
6639 | if (btrfs_path_cachep) |
6640 | kmem_cache_destroy(btrfs_path_cachep); | |
6641 | } | |
6642 | ||
6643 | int btrfs_init_cachep(void) | |
6644 | { | |
9601e3f6 CH |
6645 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", |
6646 | sizeof(struct btrfs_inode), 0, | |
6647 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); | |
39279cc3 CM |
6648 | if (!btrfs_inode_cachep) |
6649 | goto fail; | |
9601e3f6 CH |
6650 | |
6651 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
6652 | sizeof(struct btrfs_trans_handle), 0, | |
6653 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
6654 | if (!btrfs_trans_handle_cachep) |
6655 | goto fail; | |
9601e3f6 CH |
6656 | |
6657 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
6658 | sizeof(struct btrfs_transaction), 0, | |
6659 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
6660 | if (!btrfs_transaction_cachep) |
6661 | goto fail; | |
9601e3f6 CH |
6662 | |
6663 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
6664 | sizeof(struct btrfs_path), 0, | |
6665 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
6666 | if (!btrfs_path_cachep) |
6667 | goto fail; | |
9601e3f6 | 6668 | |
39279cc3 CM |
6669 | return 0; |
6670 | fail: | |
6671 | btrfs_destroy_cachep(); | |
6672 | return -ENOMEM; | |
6673 | } | |
6674 | ||
6675 | static int btrfs_getattr(struct vfsmount *mnt, | |
6676 | struct dentry *dentry, struct kstat *stat) | |
6677 | { | |
6678 | struct inode *inode = dentry->d_inode; | |
6679 | generic_fillattr(inode, stat); | |
3394e160 | 6680 | stat->dev = BTRFS_I(inode)->root->anon_super.s_dev; |
d6667462 | 6681 | stat->blksize = PAGE_CACHE_SIZE; |
a76a3cd4 YZ |
6682 | stat->blocks = (inode_get_bytes(inode) + |
6683 | BTRFS_I(inode)->delalloc_bytes) >> 9; | |
39279cc3 CM |
6684 | return 0; |
6685 | } | |
6686 | ||
d397712b CM |
6687 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
6688 | struct inode *new_dir, struct dentry *new_dentry) | |
39279cc3 CM |
6689 | { |
6690 | struct btrfs_trans_handle *trans; | |
6691 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
4df27c4d | 6692 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
39279cc3 CM |
6693 | struct inode *new_inode = new_dentry->d_inode; |
6694 | struct inode *old_inode = old_dentry->d_inode; | |
6695 | struct timespec ctime = CURRENT_TIME; | |
00e4e6b3 | 6696 | u64 index = 0; |
4df27c4d | 6697 | u64 root_objectid; |
39279cc3 CM |
6698 | int ret; |
6699 | ||
f679a840 YZ |
6700 | if (new_dir->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
6701 | return -EPERM; | |
6702 | ||
4df27c4d YZ |
6703 | /* we only allow rename subvolume link between subvolumes */ |
6704 | if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) | |
3394e160 CM |
6705 | return -EXDEV; |
6706 | ||
4df27c4d YZ |
6707 | if (old_inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
6708 | (new_inode && new_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) | |
39279cc3 | 6709 | return -ENOTEMPTY; |
5f39d397 | 6710 | |
4df27c4d YZ |
6711 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
6712 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) | |
6713 | return -ENOTEMPTY; | |
5a3f23d5 CM |
6714 | /* |
6715 | * we're using rename to replace one file with another. | |
6716 | * and the replacement file is large. Start IO on it now so | |
6717 | * we don't add too much work to the end of the transaction | |
6718 | */ | |
4baf8c92 | 6719 | if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size && |
5a3f23d5 CM |
6720 | old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
6721 | filemap_flush(old_inode->i_mapping); | |
6722 | ||
76dda93c YZ |
6723 | /* close the racy window with snapshot create/destroy ioctl */ |
6724 | if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) | |
6725 | down_read(&root->fs_info->subvol_sem); | |
a22285a6 YZ |
6726 | /* |
6727 | * We want to reserve the absolute worst case amount of items. So if | |
6728 | * both inodes are subvols and we need to unlink them then that would | |
6729 | * require 4 item modifications, but if they are both normal inodes it | |
6730 | * would require 5 item modifications, so we'll assume their normal | |
6731 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items | |
6732 | * should cover the worst case number of items we'll modify. | |
6733 | */ | |
6734 | trans = btrfs_start_transaction(root, 20); | |
6735 | if (IS_ERR(trans)) | |
6736 | return PTR_ERR(trans); | |
76dda93c | 6737 | |
a5719521 | 6738 | btrfs_set_trans_block_group(trans, new_dir); |
5f39d397 | 6739 | |
4df27c4d YZ |
6740 | if (dest != root) |
6741 | btrfs_record_root_in_trans(trans, dest); | |
5f39d397 | 6742 | |
a5719521 YZ |
6743 | ret = btrfs_set_inode_index(new_dir, &index); |
6744 | if (ret) | |
6745 | goto out_fail; | |
5a3f23d5 | 6746 | |
a5719521 | 6747 | if (unlikely(old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6748 | /* force full log commit if subvolume involved. */ |
6749 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
6750 | } else { | |
a5719521 YZ |
6751 | ret = btrfs_insert_inode_ref(trans, dest, |
6752 | new_dentry->d_name.name, | |
6753 | new_dentry->d_name.len, | |
6754 | old_inode->i_ino, | |
6755 | new_dir->i_ino, index); | |
6756 | if (ret) | |
6757 | goto out_fail; | |
4df27c4d YZ |
6758 | /* |
6759 | * this is an ugly little race, but the rename is required | |
6760 | * to make sure that if we crash, the inode is either at the | |
6761 | * old name or the new one. pinning the log transaction lets | |
6762 | * us make sure we don't allow a log commit to come in after | |
6763 | * we unlink the name but before we add the new name back in. | |
6764 | */ | |
6765 | btrfs_pin_log_trans(root); | |
6766 | } | |
5a3f23d5 CM |
6767 | /* |
6768 | * make sure the inode gets flushed if it is replacing | |
6769 | * something. | |
6770 | */ | |
6771 | if (new_inode && new_inode->i_size && | |
6772 | old_inode && S_ISREG(old_inode->i_mode)) { | |
6773 | btrfs_add_ordered_operation(trans, root, old_inode); | |
6774 | } | |
6775 | ||
39279cc3 CM |
6776 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
6777 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
6778 | old_inode->i_ctime = ctime; | |
5f39d397 | 6779 | |
12fcfd22 CM |
6780 | if (old_dentry->d_parent != new_dentry->d_parent) |
6781 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); | |
6782 | ||
4df27c4d YZ |
6783 | if (unlikely(old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
6784 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; | |
6785 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, | |
6786 | old_dentry->d_name.name, | |
6787 | old_dentry->d_name.len); | |
6788 | } else { | |
6789 | btrfs_inc_nlink(old_dentry->d_inode); | |
6790 | ret = btrfs_unlink_inode(trans, root, old_dir, | |
6791 | old_dentry->d_inode, | |
6792 | old_dentry->d_name.name, | |
6793 | old_dentry->d_name.len); | |
6794 | } | |
6795 | BUG_ON(ret); | |
39279cc3 CM |
6796 | |
6797 | if (new_inode) { | |
6798 | new_inode->i_ctime = CURRENT_TIME; | |
4df27c4d YZ |
6799 | if (unlikely(new_inode->i_ino == |
6800 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { | |
6801 | root_objectid = BTRFS_I(new_inode)->location.objectid; | |
6802 | ret = btrfs_unlink_subvol(trans, dest, new_dir, | |
6803 | root_objectid, | |
6804 | new_dentry->d_name.name, | |
6805 | new_dentry->d_name.len); | |
6806 | BUG_ON(new_inode->i_nlink == 0); | |
6807 | } else { | |
6808 | ret = btrfs_unlink_inode(trans, dest, new_dir, | |
6809 | new_dentry->d_inode, | |
6810 | new_dentry->d_name.name, | |
6811 | new_dentry->d_name.len); | |
6812 | } | |
6813 | BUG_ON(ret); | |
7b128766 | 6814 | if (new_inode->i_nlink == 0) { |
e02119d5 | 6815 | ret = btrfs_orphan_add(trans, new_dentry->d_inode); |
4df27c4d | 6816 | BUG_ON(ret); |
7b128766 | 6817 | } |
39279cc3 | 6818 | } |
aec7477b | 6819 | |
4df27c4d YZ |
6820 | ret = btrfs_add_link(trans, new_dir, old_inode, |
6821 | new_dentry->d_name.name, | |
a5719521 | 6822 | new_dentry->d_name.len, 0, index); |
4df27c4d | 6823 | BUG_ON(ret); |
39279cc3 | 6824 | |
4df27c4d | 6825 | if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { |
6a912213 JB |
6826 | struct dentry *parent = dget_parent(new_dentry); |
6827 | btrfs_log_new_name(trans, old_inode, old_dir, parent); | |
6828 | dput(parent); | |
4df27c4d YZ |
6829 | btrfs_end_log_trans(root); |
6830 | } | |
39279cc3 | 6831 | out_fail: |
ab78c84d | 6832 | btrfs_end_transaction_throttle(trans, root); |
4df27c4d | 6833 | |
76dda93c YZ |
6834 | if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) |
6835 | up_read(&root->fs_info->subvol_sem); | |
9ed74f2d | 6836 | |
39279cc3 CM |
6837 | return ret; |
6838 | } | |
6839 | ||
d352ac68 CM |
6840 | /* |
6841 | * some fairly slow code that needs optimization. This walks the list | |
6842 | * of all the inodes with pending delalloc and forces them to disk. | |
6843 | */ | |
24bbcf04 | 6844 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
ea8c2819 CM |
6845 | { |
6846 | struct list_head *head = &root->fs_info->delalloc_inodes; | |
6847 | struct btrfs_inode *binode; | |
5b21f2ed | 6848 | struct inode *inode; |
ea8c2819 | 6849 | |
c146afad YZ |
6850 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
6851 | return -EROFS; | |
6852 | ||
75eff68e | 6853 | spin_lock(&root->fs_info->delalloc_lock); |
d397712b | 6854 | while (!list_empty(head)) { |
ea8c2819 CM |
6855 | binode = list_entry(head->next, struct btrfs_inode, |
6856 | delalloc_inodes); | |
5b21f2ed ZY |
6857 | inode = igrab(&binode->vfs_inode); |
6858 | if (!inode) | |
6859 | list_del_init(&binode->delalloc_inodes); | |
75eff68e | 6860 | spin_unlock(&root->fs_info->delalloc_lock); |
5b21f2ed | 6861 | if (inode) { |
8c8bee1d | 6862 | filemap_flush(inode->i_mapping); |
24bbcf04 YZ |
6863 | if (delay_iput) |
6864 | btrfs_add_delayed_iput(inode); | |
6865 | else | |
6866 | iput(inode); | |
5b21f2ed ZY |
6867 | } |
6868 | cond_resched(); | |
75eff68e | 6869 | spin_lock(&root->fs_info->delalloc_lock); |
ea8c2819 | 6870 | } |
75eff68e | 6871 | spin_unlock(&root->fs_info->delalloc_lock); |
8c8bee1d CM |
6872 | |
6873 | /* the filemap_flush will queue IO into the worker threads, but | |
6874 | * we have to make sure the IO is actually started and that | |
6875 | * ordered extents get created before we return | |
6876 | */ | |
6877 | atomic_inc(&root->fs_info->async_submit_draining); | |
d397712b | 6878 | while (atomic_read(&root->fs_info->nr_async_submits) || |
771ed689 | 6879 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
8c8bee1d | 6880 | wait_event(root->fs_info->async_submit_wait, |
771ed689 CM |
6881 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
6882 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
8c8bee1d CM |
6883 | } |
6884 | atomic_dec(&root->fs_info->async_submit_draining); | |
ea8c2819 CM |
6885 | return 0; |
6886 | } | |
6887 | ||
0019f10d JB |
6888 | int btrfs_start_one_delalloc_inode(struct btrfs_root *root, int delay_iput, |
6889 | int sync) | |
5da9d01b YZ |
6890 | { |
6891 | struct btrfs_inode *binode; | |
6892 | struct inode *inode = NULL; | |
6893 | ||
6894 | spin_lock(&root->fs_info->delalloc_lock); | |
6895 | while (!list_empty(&root->fs_info->delalloc_inodes)) { | |
6896 | binode = list_entry(root->fs_info->delalloc_inodes.next, | |
6897 | struct btrfs_inode, delalloc_inodes); | |
6898 | inode = igrab(&binode->vfs_inode); | |
6899 | if (inode) { | |
6900 | list_move_tail(&binode->delalloc_inodes, | |
6901 | &root->fs_info->delalloc_inodes); | |
6902 | break; | |
6903 | } | |
6904 | ||
6905 | list_del_init(&binode->delalloc_inodes); | |
6906 | cond_resched_lock(&root->fs_info->delalloc_lock); | |
6907 | } | |
6908 | spin_unlock(&root->fs_info->delalloc_lock); | |
6909 | ||
6910 | if (inode) { | |
0019f10d JB |
6911 | if (sync) { |
6912 | filemap_write_and_wait(inode->i_mapping); | |
6913 | /* | |
6914 | * We have to do this because compression doesn't | |
6915 | * actually set PG_writeback until it submits the pages | |
6916 | * for IO, which happens in an async thread, so we could | |
6917 | * race and not actually wait for any writeback pages | |
6918 | * because they've not been submitted yet. Technically | |
6919 | * this could still be the case for the ordered stuff | |
6920 | * since the async thread may not have started to do its | |
6921 | * work yet. If this becomes the case then we need to | |
6922 | * figure out a way to make sure that in writepage we | |
6923 | * wait for any async pages to be submitted before | |
6924 | * returning so that fdatawait does what its supposed to | |
6925 | * do. | |
6926 | */ | |
6927 | btrfs_wait_ordered_range(inode, 0, (u64)-1); | |
6928 | } else { | |
6929 | filemap_flush(inode->i_mapping); | |
6930 | } | |
5da9d01b YZ |
6931 | if (delay_iput) |
6932 | btrfs_add_delayed_iput(inode); | |
6933 | else | |
6934 | iput(inode); | |
6935 | return 1; | |
6936 | } | |
6937 | return 0; | |
6938 | } | |
6939 | ||
39279cc3 CM |
6940 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
6941 | const char *symname) | |
6942 | { | |
6943 | struct btrfs_trans_handle *trans; | |
6944 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
6945 | struct btrfs_path *path; | |
6946 | struct btrfs_key key; | |
1832a6d5 | 6947 | struct inode *inode = NULL; |
39279cc3 CM |
6948 | int err; |
6949 | int drop_inode = 0; | |
6950 | u64 objectid; | |
00e4e6b3 | 6951 | u64 index = 0 ; |
39279cc3 CM |
6952 | int name_len; |
6953 | int datasize; | |
5f39d397 | 6954 | unsigned long ptr; |
39279cc3 | 6955 | struct btrfs_file_extent_item *ei; |
5f39d397 | 6956 | struct extent_buffer *leaf; |
1832a6d5 | 6957 | unsigned long nr = 0; |
39279cc3 CM |
6958 | |
6959 | name_len = strlen(symname) + 1; | |
6960 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
6961 | return -ENAMETOOLONG; | |
1832a6d5 | 6962 | |
a22285a6 YZ |
6963 | err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid); |
6964 | if (err) | |
6965 | return err; | |
9ed74f2d JB |
6966 | /* |
6967 | * 2 items for inode item and ref | |
6968 | * 2 items for dir items | |
6969 | * 1 item for xattr if selinux is on | |
6970 | */ | |
a22285a6 YZ |
6971 | trans = btrfs_start_transaction(root, 5); |
6972 | if (IS_ERR(trans)) | |
6973 | return PTR_ERR(trans); | |
1832a6d5 | 6974 | |
39279cc3 CM |
6975 | btrfs_set_trans_block_group(trans, dir); |
6976 | ||
aec7477b | 6977 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
a1b075d2 | 6978 | dentry->d_name.len, dir->i_ino, objectid, |
00e4e6b3 CM |
6979 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO, |
6980 | &index); | |
39279cc3 CM |
6981 | err = PTR_ERR(inode); |
6982 | if (IS_ERR(inode)) | |
6983 | goto out_unlock; | |
6984 | ||
f34f57a3 | 6985 | err = btrfs_init_inode_security(trans, inode, dir); |
33268eaf JB |
6986 | if (err) { |
6987 | drop_inode = 1; | |
6988 | goto out_unlock; | |
6989 | } | |
6990 | ||
39279cc3 | 6991 | btrfs_set_trans_block_group(trans, inode); |
a1b075d2 | 6992 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 CM |
6993 | if (err) |
6994 | drop_inode = 1; | |
6995 | else { | |
6996 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 6997 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
6998 | inode->i_fop = &btrfs_file_operations; |
6999 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e | 7000 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 | 7001 | } |
39279cc3 CM |
7002 | btrfs_update_inode_block_group(trans, inode); |
7003 | btrfs_update_inode_block_group(trans, dir); | |
7004 | if (drop_inode) | |
7005 | goto out_unlock; | |
7006 | ||
7007 | path = btrfs_alloc_path(); | |
7008 | BUG_ON(!path); | |
7009 | key.objectid = inode->i_ino; | |
7010 | key.offset = 0; | |
39279cc3 CM |
7011 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
7012 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
7013 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
7014 | datasize); | |
54aa1f4d CM |
7015 | if (err) { |
7016 | drop_inode = 1; | |
7017 | goto out_unlock; | |
7018 | } | |
5f39d397 CM |
7019 | leaf = path->nodes[0]; |
7020 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
7021 | struct btrfs_file_extent_item); | |
7022 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
7023 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 | 7024 | BTRFS_FILE_EXTENT_INLINE); |
c8b97818 CM |
7025 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
7026 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
7027 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
7028 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); | |
7029 | ||
39279cc3 | 7030 | ptr = btrfs_file_extent_inline_start(ei); |
5f39d397 CM |
7031 | write_extent_buffer(leaf, symname, ptr, name_len); |
7032 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 7033 | btrfs_free_path(path); |
5f39d397 | 7034 | |
39279cc3 CM |
7035 | inode->i_op = &btrfs_symlink_inode_operations; |
7036 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 7037 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d899e052 | 7038 | inode_set_bytes(inode, name_len); |
dbe674a9 | 7039 | btrfs_i_size_write(inode, name_len - 1); |
54aa1f4d CM |
7040 | err = btrfs_update_inode(trans, root, inode); |
7041 | if (err) | |
7042 | drop_inode = 1; | |
39279cc3 CM |
7043 | |
7044 | out_unlock: | |
d3c2fdcf | 7045 | nr = trans->blocks_used; |
ab78c84d | 7046 | btrfs_end_transaction_throttle(trans, root); |
39279cc3 CM |
7047 | if (drop_inode) { |
7048 | inode_dec_link_count(inode); | |
7049 | iput(inode); | |
7050 | } | |
d3c2fdcf | 7051 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
7052 | return err; |
7053 | } | |
16432985 | 7054 | |
0af3d00b JB |
7055 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
7056 | u64 start, u64 num_bytes, u64 min_size, | |
7057 | loff_t actual_len, u64 *alloc_hint, | |
7058 | struct btrfs_trans_handle *trans) | |
d899e052 | 7059 | { |
d899e052 YZ |
7060 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7061 | struct btrfs_key ins; | |
d899e052 | 7062 | u64 cur_offset = start; |
55a61d1d | 7063 | u64 i_size; |
d899e052 | 7064 | int ret = 0; |
0af3d00b | 7065 | bool own_trans = true; |
d899e052 | 7066 | |
0af3d00b JB |
7067 | if (trans) |
7068 | own_trans = false; | |
d899e052 | 7069 | while (num_bytes > 0) { |
0af3d00b JB |
7070 | if (own_trans) { |
7071 | trans = btrfs_start_transaction(root, 3); | |
7072 | if (IS_ERR(trans)) { | |
7073 | ret = PTR_ERR(trans); | |
7074 | break; | |
7075 | } | |
5a303d5d YZ |
7076 | } |
7077 | ||
efa56464 YZ |
7078 | ret = btrfs_reserve_extent(trans, root, num_bytes, min_size, |
7079 | 0, *alloc_hint, (u64)-1, &ins, 1); | |
5a303d5d | 7080 | if (ret) { |
0af3d00b JB |
7081 | if (own_trans) |
7082 | btrfs_end_transaction(trans, root); | |
a22285a6 | 7083 | break; |
d899e052 | 7084 | } |
5a303d5d | 7085 | |
d899e052 YZ |
7086 | ret = insert_reserved_file_extent(trans, inode, |
7087 | cur_offset, ins.objectid, | |
7088 | ins.offset, ins.offset, | |
920bbbfb | 7089 | ins.offset, 0, 0, 0, |
d899e052 YZ |
7090 | BTRFS_FILE_EXTENT_PREALLOC); |
7091 | BUG_ON(ret); | |
a1ed835e CM |
7092 | btrfs_drop_extent_cache(inode, cur_offset, |
7093 | cur_offset + ins.offset -1, 0); | |
5a303d5d | 7094 | |
d899e052 YZ |
7095 | num_bytes -= ins.offset; |
7096 | cur_offset += ins.offset; | |
efa56464 | 7097 | *alloc_hint = ins.objectid + ins.offset; |
5a303d5d | 7098 | |
d899e052 | 7099 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 7100 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
d899e052 | 7101 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
efa56464 YZ |
7102 | (actual_len > inode->i_size) && |
7103 | (cur_offset > inode->i_size)) { | |
d1ea6a61 | 7104 | if (cur_offset > actual_len) |
55a61d1d | 7105 | i_size = actual_len; |
d1ea6a61 | 7106 | else |
55a61d1d JB |
7107 | i_size = cur_offset; |
7108 | i_size_write(inode, i_size); | |
7109 | btrfs_ordered_update_i_size(inode, i_size, NULL); | |
5a303d5d YZ |
7110 | } |
7111 | ||
d899e052 YZ |
7112 | ret = btrfs_update_inode(trans, root, inode); |
7113 | BUG_ON(ret); | |
d899e052 | 7114 | |
0af3d00b JB |
7115 | if (own_trans) |
7116 | btrfs_end_transaction(trans, root); | |
5a303d5d | 7117 | } |
d899e052 YZ |
7118 | return ret; |
7119 | } | |
7120 | ||
0af3d00b JB |
7121 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
7122 | u64 start, u64 num_bytes, u64 min_size, | |
7123 | loff_t actual_len, u64 *alloc_hint) | |
7124 | { | |
7125 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
7126 | min_size, actual_len, alloc_hint, | |
7127 | NULL); | |
7128 | } | |
7129 | ||
7130 | int btrfs_prealloc_file_range_trans(struct inode *inode, | |
7131 | struct btrfs_trans_handle *trans, int mode, | |
7132 | u64 start, u64 num_bytes, u64 min_size, | |
7133 | loff_t actual_len, u64 *alloc_hint) | |
7134 | { | |
7135 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
7136 | min_size, actual_len, alloc_hint, trans); | |
7137 | } | |
7138 | ||
e6dcd2dc CM |
7139 | static int btrfs_set_page_dirty(struct page *page) |
7140 | { | |
e6dcd2dc CM |
7141 | return __set_page_dirty_nobuffers(page); |
7142 | } | |
7143 | ||
b74c79e9 | 7144 | static int btrfs_permission(struct inode *inode, int mask, unsigned int flags) |
fdebe2bd | 7145 | { |
b83cc969 LZ |
7146 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7147 | ||
7148 | if (btrfs_root_readonly(root) && (mask & MAY_WRITE)) | |
7149 | return -EROFS; | |
6cbff00f | 7150 | if ((BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) && (mask & MAY_WRITE)) |
fdebe2bd | 7151 | return -EACCES; |
b74c79e9 | 7152 | return generic_permission(inode, mask, flags, btrfs_check_acl); |
fdebe2bd | 7153 | } |
39279cc3 | 7154 | |
6e1d5dcc | 7155 | static const struct inode_operations btrfs_dir_inode_operations = { |
3394e160 | 7156 | .getattr = btrfs_getattr, |
39279cc3 CM |
7157 | .lookup = btrfs_lookup, |
7158 | .create = btrfs_create, | |
7159 | .unlink = btrfs_unlink, | |
7160 | .link = btrfs_link, | |
7161 | .mkdir = btrfs_mkdir, | |
7162 | .rmdir = btrfs_rmdir, | |
7163 | .rename = btrfs_rename, | |
7164 | .symlink = btrfs_symlink, | |
7165 | .setattr = btrfs_setattr, | |
618e21d5 | 7166 | .mknod = btrfs_mknod, |
95819c05 CH |
7167 | .setxattr = btrfs_setxattr, |
7168 | .getxattr = btrfs_getxattr, | |
5103e947 | 7169 | .listxattr = btrfs_listxattr, |
95819c05 | 7170 | .removexattr = btrfs_removexattr, |
fdebe2bd | 7171 | .permission = btrfs_permission, |
39279cc3 | 7172 | }; |
6e1d5dcc | 7173 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
39279cc3 | 7174 | .lookup = btrfs_lookup, |
fdebe2bd | 7175 | .permission = btrfs_permission, |
39279cc3 | 7176 | }; |
76dda93c | 7177 | |
828c0950 | 7178 | static const struct file_operations btrfs_dir_file_operations = { |
39279cc3 CM |
7179 | .llseek = generic_file_llseek, |
7180 | .read = generic_read_dir, | |
cbdf5a24 | 7181 | .readdir = btrfs_real_readdir, |
34287aa3 | 7182 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 7183 | #ifdef CONFIG_COMPAT |
34287aa3 | 7184 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 7185 | #endif |
6bf13c0c | 7186 | .release = btrfs_release_file, |
e02119d5 | 7187 | .fsync = btrfs_sync_file, |
39279cc3 CM |
7188 | }; |
7189 | ||
d1310b2e | 7190 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 7191 | .fill_delalloc = run_delalloc_range, |
065631f6 | 7192 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 7193 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 7194 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 7195 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 7196 | .writepage_start_hook = btrfs_writepage_start_hook, |
1259ab75 | 7197 | .readpage_io_failed_hook = btrfs_io_failed_hook, |
b0c68f8b CM |
7198 | .set_bit_hook = btrfs_set_bit_hook, |
7199 | .clear_bit_hook = btrfs_clear_bit_hook, | |
9ed74f2d JB |
7200 | .merge_extent_hook = btrfs_merge_extent_hook, |
7201 | .split_extent_hook = btrfs_split_extent_hook, | |
07157aac CM |
7202 | }; |
7203 | ||
35054394 CM |
7204 | /* |
7205 | * btrfs doesn't support the bmap operation because swapfiles | |
7206 | * use bmap to make a mapping of extents in the file. They assume | |
7207 | * these extents won't change over the life of the file and they | |
7208 | * use the bmap result to do IO directly to the drive. | |
7209 | * | |
7210 | * the btrfs bmap call would return logical addresses that aren't | |
7211 | * suitable for IO and they also will change frequently as COW | |
7212 | * operations happen. So, swapfile + btrfs == corruption. | |
7213 | * | |
7214 | * For now we're avoiding this by dropping bmap. | |
7215 | */ | |
7f09410b | 7216 | static const struct address_space_operations btrfs_aops = { |
39279cc3 CM |
7217 | .readpage = btrfs_readpage, |
7218 | .writepage = btrfs_writepage, | |
b293f02e | 7219 | .writepages = btrfs_writepages, |
3ab2fb5a | 7220 | .readpages = btrfs_readpages, |
39279cc3 | 7221 | .sync_page = block_sync_page, |
16432985 | 7222 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
7223 | .invalidatepage = btrfs_invalidatepage, |
7224 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 7225 | .set_page_dirty = btrfs_set_page_dirty, |
465fdd97 | 7226 | .error_remove_page = generic_error_remove_page, |
39279cc3 CM |
7227 | }; |
7228 | ||
7f09410b | 7229 | static const struct address_space_operations btrfs_symlink_aops = { |
39279cc3 CM |
7230 | .readpage = btrfs_readpage, |
7231 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
7232 | .invalidatepage = btrfs_invalidatepage, |
7233 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
7234 | }; |
7235 | ||
6e1d5dcc | 7236 | static const struct inode_operations btrfs_file_inode_operations = { |
39279cc3 CM |
7237 | .truncate = btrfs_truncate, |
7238 | .getattr = btrfs_getattr, | |
7239 | .setattr = btrfs_setattr, | |
95819c05 CH |
7240 | .setxattr = btrfs_setxattr, |
7241 | .getxattr = btrfs_getxattr, | |
5103e947 | 7242 | .listxattr = btrfs_listxattr, |
95819c05 | 7243 | .removexattr = btrfs_removexattr, |
fdebe2bd | 7244 | .permission = btrfs_permission, |
1506fcc8 | 7245 | .fiemap = btrfs_fiemap, |
39279cc3 | 7246 | }; |
6e1d5dcc | 7247 | static const struct inode_operations btrfs_special_inode_operations = { |
618e21d5 JB |
7248 | .getattr = btrfs_getattr, |
7249 | .setattr = btrfs_setattr, | |
fdebe2bd | 7250 | .permission = btrfs_permission, |
95819c05 CH |
7251 | .setxattr = btrfs_setxattr, |
7252 | .getxattr = btrfs_getxattr, | |
33268eaf | 7253 | .listxattr = btrfs_listxattr, |
95819c05 | 7254 | .removexattr = btrfs_removexattr, |
618e21d5 | 7255 | }; |
6e1d5dcc | 7256 | static const struct inode_operations btrfs_symlink_inode_operations = { |
39279cc3 CM |
7257 | .readlink = generic_readlink, |
7258 | .follow_link = page_follow_link_light, | |
7259 | .put_link = page_put_link, | |
f209561a | 7260 | .getattr = btrfs_getattr, |
fdebe2bd | 7261 | .permission = btrfs_permission, |
0279b4cd JO |
7262 | .setxattr = btrfs_setxattr, |
7263 | .getxattr = btrfs_getxattr, | |
7264 | .listxattr = btrfs_listxattr, | |
7265 | .removexattr = btrfs_removexattr, | |
39279cc3 | 7266 | }; |
76dda93c | 7267 | |
82d339d9 | 7268 | const struct dentry_operations btrfs_dentry_operations = { |
76dda93c YZ |
7269 | .d_delete = btrfs_dentry_delete, |
7270 | }; |