Commit | Line | Data |
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05fe58fd RK |
1 | /* |
2 | * inode.c - NILFS inode operations. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/buffer_head.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
05fe58fd RK |
26 | #include <linux/mpage.h> |
27 | #include <linux/writeback.h> | |
a27bb332 | 28 | #include <linux/aio.h> |
05fe58fd | 29 | #include "nilfs.h" |
6fd1e5c9 | 30 | #include "btnode.h" |
05fe58fd RK |
31 | #include "segment.h" |
32 | #include "page.h" | |
33 | #include "mdt.h" | |
34 | #include "cpfile.h" | |
35 | #include "ifile.h" | |
36 | ||
f5974c8f VD |
37 | /** |
38 | * struct nilfs_iget_args - arguments used during comparison between inodes | |
39 | * @ino: inode number | |
40 | * @cno: checkpoint number | |
41 | * @root: pointer on NILFS root object (mounted checkpoint) | |
42 | * @for_gc: inode for GC flag | |
43 | */ | |
0e14a359 RK |
44 | struct nilfs_iget_args { |
45 | u64 ino; | |
46 | __u64 cno; | |
4d8d9293 | 47 | struct nilfs_root *root; |
0e14a359 RK |
48 | int for_gc; |
49 | }; | |
05fe58fd | 50 | |
be667377 RK |
51 | void nilfs_inode_add_blocks(struct inode *inode, int n) |
52 | { | |
53 | struct nilfs_root *root = NILFS_I(inode)->i_root; | |
54 | ||
55 | inode_add_bytes(inode, (1 << inode->i_blkbits) * n); | |
56 | if (root) | |
e5f7f848 | 57 | atomic64_add(n, &root->blocks_count); |
be667377 RK |
58 | } |
59 | ||
60 | void nilfs_inode_sub_blocks(struct inode *inode, int n) | |
61 | { | |
62 | struct nilfs_root *root = NILFS_I(inode)->i_root; | |
63 | ||
64 | inode_sub_bytes(inode, (1 << inode->i_blkbits) * n); | |
65 | if (root) | |
e5f7f848 | 66 | atomic64_sub(n, &root->blocks_count); |
be667377 RK |
67 | } |
68 | ||
05fe58fd RK |
69 | /** |
70 | * nilfs_get_block() - get a file block on the filesystem (callback function) | |
71 | * @inode - inode struct of the target file | |
72 | * @blkoff - file block number | |
73 | * @bh_result - buffer head to be mapped on | |
74 | * @create - indicate whether allocating the block or not when it has not | |
75 | * been allocated yet. | |
76 | * | |
77 | * This function does not issue actual read request of the specified data | |
78 | * block. It is done by VFS. | |
05fe58fd RK |
79 | */ |
80 | int nilfs_get_block(struct inode *inode, sector_t blkoff, | |
81 | struct buffer_head *bh_result, int create) | |
82 | { | |
83 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
0ef28f9a | 84 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
c3a7abf0 | 85 | __u64 blknum = 0; |
05fe58fd | 86 | int err = 0, ret; |
c3a7abf0 | 87 | unsigned maxblocks = bh_result->b_size >> inode->i_blkbits; |
05fe58fd | 88 | |
0ef28f9a | 89 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
c3a7abf0 | 90 | ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks); |
0ef28f9a | 91 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
c3a7abf0 | 92 | if (ret >= 0) { /* found */ |
05fe58fd | 93 | map_bh(bh_result, inode->i_sb, blknum); |
c3a7abf0 RK |
94 | if (ret > 0) |
95 | bh_result->b_size = (ret << inode->i_blkbits); | |
05fe58fd RK |
96 | goto out; |
97 | } | |
05fe58fd RK |
98 | /* data block was not found */ |
99 | if (ret == -ENOENT && create) { | |
100 | struct nilfs_transaction_info ti; | |
101 | ||
102 | bh_result->b_blocknr = 0; | |
103 | err = nilfs_transaction_begin(inode->i_sb, &ti, 1); | |
104 | if (unlikely(err)) | |
105 | goto out; | |
106 | err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff, | |
107 | (unsigned long)bh_result); | |
05fe58fd RK |
108 | if (unlikely(err != 0)) { |
109 | if (err == -EEXIST) { | |
110 | /* | |
111 | * The get_block() function could be called | |
112 | * from multiple callers for an inode. | |
113 | * However, the page having this block must | |
114 | * be locked in this case. | |
115 | */ | |
1f5abe7e | 116 | printk(KERN_WARNING |
05fe58fd RK |
117 | "nilfs_get_block: a race condition " |
118 | "while inserting a data block. " | |
119 | "(inode number=%lu, file block " | |
120 | "offset=%llu)\n", | |
121 | inode->i_ino, | |
122 | (unsigned long long)blkoff); | |
1f5abe7e | 123 | err = 0; |
05fe58fd | 124 | } |
47420c79 | 125 | nilfs_transaction_abort(inode->i_sb); |
05fe58fd RK |
126 | goto out; |
127 | } | |
abdb318b | 128 | nilfs_mark_inode_dirty(inode); |
47420c79 | 129 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd RK |
130 | /* Error handling should be detailed */ |
131 | set_buffer_new(bh_result); | |
27e6c7a3 | 132 | set_buffer_delay(bh_result); |
05fe58fd RK |
133 | map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed |
134 | to proper value */ | |
135 | } else if (ret == -ENOENT) { | |
136 | /* not found is not error (e.g. hole); must return without | |
137 | the mapped state flag. */ | |
138 | ; | |
139 | } else { | |
140 | err = ret; | |
141 | } | |
142 | ||
143 | out: | |
144 | return err; | |
145 | } | |
146 | ||
147 | /** | |
148 | * nilfs_readpage() - implement readpage() method of nilfs_aops {} | |
149 | * address_space_operations. | |
150 | * @file - file struct of the file to be read | |
151 | * @page - the page to be read | |
152 | */ | |
153 | static int nilfs_readpage(struct file *file, struct page *page) | |
154 | { | |
155 | return mpage_readpage(page, nilfs_get_block); | |
156 | } | |
157 | ||
158 | /** | |
159 | * nilfs_readpages() - implement readpages() method of nilfs_aops {} | |
160 | * address_space_operations. | |
161 | * @file - file struct of the file to be read | |
162 | * @mapping - address_space struct used for reading multiple pages | |
163 | * @pages - the pages to be read | |
164 | * @nr_pages - number of pages to be read | |
165 | */ | |
166 | static int nilfs_readpages(struct file *file, struct address_space *mapping, | |
167 | struct list_head *pages, unsigned nr_pages) | |
168 | { | |
169 | return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); | |
170 | } | |
171 | ||
172 | static int nilfs_writepages(struct address_space *mapping, | |
173 | struct writeback_control *wbc) | |
174 | { | |
f30bf3e4 RK |
175 | struct inode *inode = mapping->host; |
176 | int err = 0; | |
177 | ||
8c26c4e2 VD |
178 | if (inode->i_sb->s_flags & MS_RDONLY) { |
179 | nilfs_clear_dirty_pages(mapping, false); | |
180 | return -EROFS; | |
181 | } | |
182 | ||
f30bf3e4 RK |
183 | if (wbc->sync_mode == WB_SYNC_ALL) |
184 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, | |
185 | wbc->range_start, | |
186 | wbc->range_end); | |
187 | return err; | |
05fe58fd RK |
188 | } |
189 | ||
190 | static int nilfs_writepage(struct page *page, struct writeback_control *wbc) | |
191 | { | |
192 | struct inode *inode = page->mapping->host; | |
193 | int err; | |
194 | ||
eb53b6db | 195 | if (inode->i_sb->s_flags & MS_RDONLY) { |
8c26c4e2 VD |
196 | /* |
197 | * It means that filesystem was remounted in read-only | |
198 | * mode because of error or metadata corruption. But we | |
199 | * have dirty pages that try to be flushed in background. | |
200 | * So, here we simply discard this dirty page. | |
201 | */ | |
202 | nilfs_clear_dirty_page(page, false); | |
203 | unlock_page(page); | |
204 | return -EROFS; | |
205 | } | |
206 | ||
05fe58fd RK |
207 | redirty_page_for_writepage(wbc, page); |
208 | unlock_page(page); | |
209 | ||
210 | if (wbc->sync_mode == WB_SYNC_ALL) { | |
211 | err = nilfs_construct_segment(inode->i_sb); | |
212 | if (unlikely(err)) | |
213 | return err; | |
214 | } else if (wbc->for_reclaim) | |
215 | nilfs_flush_segment(inode->i_sb, inode->i_ino); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int nilfs_set_page_dirty(struct page *page) | |
221 | { | |
136e8770 | 222 | int ret = __set_page_dirty_nobuffers(page); |
05fe58fd | 223 | |
136e8770 | 224 | if (page_has_buffers(page)) { |
05fe58fd | 225 | struct inode *inode = page->mapping->host; |
136e8770 RK |
226 | unsigned nr_dirty = 0; |
227 | struct buffer_head *bh, *head; | |
05fe58fd | 228 | |
136e8770 RK |
229 | /* |
230 | * This page is locked by callers, and no other thread | |
231 | * concurrently marks its buffers dirty since they are | |
232 | * only dirtied through routines in fs/buffer.c in | |
233 | * which call sites of mark_buffer_dirty are protected | |
234 | * by page lock. | |
235 | */ | |
236 | bh = head = page_buffers(page); | |
237 | do { | |
238 | /* Do not mark hole blocks dirty */ | |
239 | if (buffer_dirty(bh) || !buffer_mapped(bh)) | |
240 | continue; | |
241 | ||
242 | set_buffer_dirty(bh); | |
243 | nr_dirty++; | |
244 | } while (bh = bh->b_this_page, bh != head); | |
245 | ||
246 | if (nr_dirty) | |
247 | nilfs_set_file_dirty(inode, nr_dirty); | |
05fe58fd RK |
248 | } |
249 | return ret; | |
250 | } | |
251 | ||
2d1b399b MS |
252 | void nilfs_write_failed(struct address_space *mapping, loff_t to) |
253 | { | |
254 | struct inode *inode = mapping->host; | |
255 | ||
256 | if (to > inode->i_size) { | |
7caef267 | 257 | truncate_pagecache(inode, inode->i_size); |
2d1b399b MS |
258 | nilfs_truncate(inode); |
259 | } | |
260 | } | |
261 | ||
05fe58fd RK |
262 | static int nilfs_write_begin(struct file *file, struct address_space *mapping, |
263 | loff_t pos, unsigned len, unsigned flags, | |
264 | struct page **pagep, void **fsdata) | |
265 | ||
266 | { | |
267 | struct inode *inode = mapping->host; | |
268 | int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); | |
269 | ||
270 | if (unlikely(err)) | |
271 | return err; | |
272 | ||
155130a4 CH |
273 | err = block_write_begin(mapping, pos, len, flags, pagep, |
274 | nilfs_get_block); | |
275 | if (unlikely(err)) { | |
2d1b399b | 276 | nilfs_write_failed(mapping, pos + len); |
47420c79 | 277 | nilfs_transaction_abort(inode->i_sb); |
155130a4 | 278 | } |
05fe58fd RK |
279 | return err; |
280 | } | |
281 | ||
282 | static int nilfs_write_end(struct file *file, struct address_space *mapping, | |
283 | loff_t pos, unsigned len, unsigned copied, | |
284 | struct page *page, void *fsdata) | |
285 | { | |
286 | struct inode *inode = mapping->host; | |
287 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
288 | unsigned nr_dirty; | |
289 | int err; | |
290 | ||
291 | nr_dirty = nilfs_page_count_clean_buffers(page, start, | |
292 | start + copied); | |
293 | copied = generic_write_end(file, mapping, pos, len, copied, page, | |
294 | fsdata); | |
bcbc8c64 | 295 | nilfs_set_file_dirty(inode, nr_dirty); |
47420c79 | 296 | err = nilfs_transaction_commit(inode->i_sb); |
05fe58fd RK |
297 | return err ? : copied; |
298 | } | |
299 | ||
300 | static ssize_t | |
d8d3d94b AV |
301 | nilfs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, |
302 | loff_t offset) | |
05fe58fd RK |
303 | { |
304 | struct file *file = iocb->ki_filp; | |
2d1b399b | 305 | struct address_space *mapping = file->f_mapping; |
05fe58fd | 306 | struct inode *inode = file->f_mapping->host; |
a6cbcd4a | 307 | size_t count = iov_iter_count(iter); |
05fe58fd | 308 | ssize_t size; |
05fe58fd RK |
309 | |
310 | if (rw == WRITE) | |
311 | return 0; | |
312 | ||
313 | /* Needs synchronization with the cleaner */ | |
31b14039 AV |
314 | size = blockdev_direct_IO(rw, iocb, inode, iter, offset, |
315 | nilfs_get_block); | |
eafdc7d1 CH |
316 | |
317 | /* | |
318 | * In case of error extending write may have instantiated a few | |
319 | * blocks outside i_size. Trim these off again. | |
320 | */ | |
321 | if (unlikely((rw & WRITE) && size < 0)) { | |
322 | loff_t isize = i_size_read(inode); | |
a6cbcd4a | 323 | loff_t end = offset + count; |
eafdc7d1 CH |
324 | |
325 | if (end > isize) | |
2d1b399b | 326 | nilfs_write_failed(mapping, end); |
eafdc7d1 CH |
327 | } |
328 | ||
05fe58fd RK |
329 | return size; |
330 | } | |
331 | ||
7f09410b | 332 | const struct address_space_operations nilfs_aops = { |
05fe58fd RK |
333 | .writepage = nilfs_writepage, |
334 | .readpage = nilfs_readpage, | |
05fe58fd RK |
335 | .writepages = nilfs_writepages, |
336 | .set_page_dirty = nilfs_set_page_dirty, | |
337 | .readpages = nilfs_readpages, | |
338 | .write_begin = nilfs_write_begin, | |
339 | .write_end = nilfs_write_end, | |
340 | /* .releasepage = nilfs_releasepage, */ | |
341 | .invalidatepage = block_invalidatepage, | |
342 | .direct_IO = nilfs_direct_IO, | |
258ef67e | 343 | .is_partially_uptodate = block_is_partially_uptodate, |
05fe58fd RK |
344 | }; |
345 | ||
c6e49e3f | 346 | struct inode *nilfs_new_inode(struct inode *dir, umode_t mode) |
05fe58fd RK |
347 | { |
348 | struct super_block *sb = dir->i_sb; | |
e3154e97 | 349 | struct the_nilfs *nilfs = sb->s_fs_info; |
05fe58fd RK |
350 | struct inode *inode; |
351 | struct nilfs_inode_info *ii; | |
4d8d9293 | 352 | struct nilfs_root *root; |
05fe58fd RK |
353 | int err = -ENOMEM; |
354 | ino_t ino; | |
355 | ||
356 | inode = new_inode(sb); | |
357 | if (unlikely(!inode)) | |
358 | goto failed; | |
359 | ||
360 | mapping_set_gfp_mask(inode->i_mapping, | |
361 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
362 | ||
4d8d9293 | 363 | root = NILFS_I(dir)->i_root; |
05fe58fd RK |
364 | ii = NILFS_I(inode); |
365 | ii->i_state = 1 << NILFS_I_NEW; | |
4d8d9293 | 366 | ii->i_root = root; |
05fe58fd | 367 | |
e912a5b6 | 368 | err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh); |
05fe58fd RK |
369 | if (unlikely(err)) |
370 | goto failed_ifile_create_inode; | |
371 | /* reference count of i_bh inherits from nilfs_mdt_read_block() */ | |
372 | ||
e5f7f848 | 373 | atomic64_inc(&root->inodes_count); |
73459dcc | 374 | inode_init_owner(inode, dir, mode); |
05fe58fd RK |
375 | inode->i_ino = ino; |
376 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
377 | ||
378 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { | |
379 | err = nilfs_bmap_read(ii->i_bmap, NULL); | |
380 | if (err < 0) | |
381 | goto failed_bmap; | |
382 | ||
383 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
384 | /* No lock is needed; iget() ensures it. */ | |
385 | } | |
386 | ||
b253a3e4 RK |
387 | ii->i_flags = nilfs_mask_flags( |
388 | mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED); | |
05fe58fd RK |
389 | |
390 | /* ii->i_file_acl = 0; */ | |
391 | /* ii->i_dir_acl = 0; */ | |
05fe58fd | 392 | ii->i_dir_start_lookup = 0; |
05fe58fd | 393 | nilfs_set_inode_flags(inode); |
9b1fc4e4 RK |
394 | spin_lock(&nilfs->ns_next_gen_lock); |
395 | inode->i_generation = nilfs->ns_next_generation++; | |
396 | spin_unlock(&nilfs->ns_next_gen_lock); | |
05fe58fd RK |
397 | insert_inode_hash(inode); |
398 | ||
399 | err = nilfs_init_acl(inode, dir); | |
400 | if (unlikely(err)) | |
401 | goto failed_acl; /* never occur. When supporting | |
402 | nilfs_init_acl(), proper cancellation of | |
403 | above jobs should be considered */ | |
404 | ||
05fe58fd RK |
405 | return inode; |
406 | ||
407 | failed_acl: | |
408 | failed_bmap: | |
6d6b77f1 | 409 | clear_nlink(inode); |
05fe58fd RK |
410 | iput(inode); /* raw_inode will be deleted through |
411 | generic_delete_inode() */ | |
412 | goto failed; | |
413 | ||
414 | failed_ifile_create_inode: | |
415 | make_bad_inode(inode); | |
416 | iput(inode); /* if i_nlink == 1, generic_forget_inode() will be | |
417 | called */ | |
418 | failed: | |
419 | return ERR_PTR(err); | |
420 | } | |
421 | ||
05fe58fd RK |
422 | void nilfs_set_inode_flags(struct inode *inode) |
423 | { | |
424 | unsigned int flags = NILFS_I(inode)->i_flags; | |
425 | ||
426 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | | |
427 | S_DIRSYNC); | |
f0c9f242 | 428 | if (flags & FS_SYNC_FL) |
05fe58fd | 429 | inode->i_flags |= S_SYNC; |
f0c9f242 | 430 | if (flags & FS_APPEND_FL) |
05fe58fd | 431 | inode->i_flags |= S_APPEND; |
f0c9f242 | 432 | if (flags & FS_IMMUTABLE_FL) |
05fe58fd | 433 | inode->i_flags |= S_IMMUTABLE; |
f0c9f242 | 434 | if (flags & FS_NOATIME_FL) |
05fe58fd | 435 | inode->i_flags |= S_NOATIME; |
f0c9f242 | 436 | if (flags & FS_DIRSYNC_FL) |
05fe58fd RK |
437 | inode->i_flags |= S_DIRSYNC; |
438 | mapping_set_gfp_mask(inode->i_mapping, | |
439 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
440 | } | |
441 | ||
442 | int nilfs_read_inode_common(struct inode *inode, | |
443 | struct nilfs_inode *raw_inode) | |
444 | { | |
445 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
446 | int err; | |
447 | ||
448 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
305d3d0d EB |
449 | i_uid_write(inode, le32_to_cpu(raw_inode->i_uid)); |
450 | i_gid_write(inode, le32_to_cpu(raw_inode->i_gid)); | |
bfe86848 | 451 | set_nlink(inode, le16_to_cpu(raw_inode->i_links_count)); |
05fe58fd RK |
452 | inode->i_size = le64_to_cpu(raw_inode->i_size); |
453 | inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
454 | inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); | |
455 | inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
61239230 RK |
456 | inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
457 | inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); | |
458 | inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); | |
459 | if (inode->i_nlink == 0 && inode->i_mode == 0) | |
05fe58fd RK |
460 | return -EINVAL; /* this inode is deleted */ |
461 | ||
462 | inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); | |
463 | ii->i_flags = le32_to_cpu(raw_inode->i_flags); | |
464 | #if 0 | |
465 | ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
466 | ii->i_dir_acl = S_ISREG(inode->i_mode) ? | |
467 | 0 : le32_to_cpu(raw_inode->i_dir_acl); | |
468 | #endif | |
3cc811bf | 469 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
470 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
471 | ||
472 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
473 | S_ISLNK(inode->i_mode)) { | |
474 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
475 | if (err < 0) | |
476 | return err; | |
477 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
478 | /* No lock is needed; iget() ensures it. */ | |
479 | } | |
480 | return 0; | |
481 | } | |
482 | ||
e912a5b6 RK |
483 | static int __nilfs_read_inode(struct super_block *sb, |
484 | struct nilfs_root *root, unsigned long ino, | |
05fe58fd RK |
485 | struct inode *inode) |
486 | { | |
e3154e97 | 487 | struct the_nilfs *nilfs = sb->s_fs_info; |
05fe58fd RK |
488 | struct buffer_head *bh; |
489 | struct nilfs_inode *raw_inode; | |
490 | int err; | |
491 | ||
365e215c | 492 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
e912a5b6 | 493 | err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh); |
05fe58fd RK |
494 | if (unlikely(err)) |
495 | goto bad_inode; | |
496 | ||
e912a5b6 | 497 | raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh); |
05fe58fd | 498 | |
1b2f5a64 RK |
499 | err = nilfs_read_inode_common(inode, raw_inode); |
500 | if (err) | |
05fe58fd RK |
501 | goto failed_unmap; |
502 | ||
503 | if (S_ISREG(inode->i_mode)) { | |
504 | inode->i_op = &nilfs_file_inode_operations; | |
505 | inode->i_fop = &nilfs_file_operations; | |
506 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
507 | } else if (S_ISDIR(inode->i_mode)) { |
508 | inode->i_op = &nilfs_dir_inode_operations; | |
509 | inode->i_fop = &nilfs_dir_operations; | |
510 | inode->i_mapping->a_ops = &nilfs_aops; | |
511 | } else if (S_ISLNK(inode->i_mode)) { | |
512 | inode->i_op = &nilfs_symlink_inode_operations; | |
513 | inode->i_mapping->a_ops = &nilfs_aops; | |
514 | } else { | |
515 | inode->i_op = &nilfs_special_inode_operations; | |
516 | init_special_inode( | |
517 | inode, inode->i_mode, | |
cdce214e | 518 | huge_decode_dev(le64_to_cpu(raw_inode->i_device_code))); |
05fe58fd | 519 | } |
e912a5b6 | 520 | nilfs_ifile_unmap_inode(root->ifile, ino, bh); |
05fe58fd | 521 | brelse(bh); |
365e215c | 522 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
05fe58fd RK |
523 | nilfs_set_inode_flags(inode); |
524 | return 0; | |
525 | ||
526 | failed_unmap: | |
e912a5b6 | 527 | nilfs_ifile_unmap_inode(root->ifile, ino, bh); |
05fe58fd RK |
528 | brelse(bh); |
529 | ||
530 | bad_inode: | |
365e215c | 531 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
05fe58fd RK |
532 | return err; |
533 | } | |
534 | ||
0e14a359 RK |
535 | static int nilfs_iget_test(struct inode *inode, void *opaque) |
536 | { | |
537 | struct nilfs_iget_args *args = opaque; | |
538 | struct nilfs_inode_info *ii; | |
539 | ||
4d8d9293 | 540 | if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root) |
0e14a359 RK |
541 | return 0; |
542 | ||
543 | ii = NILFS_I(inode); | |
544 | if (!test_bit(NILFS_I_GCINODE, &ii->i_state)) | |
545 | return !args->for_gc; | |
546 | ||
547 | return args->for_gc && args->cno == ii->i_cno; | |
548 | } | |
549 | ||
550 | static int nilfs_iget_set(struct inode *inode, void *opaque) | |
551 | { | |
552 | struct nilfs_iget_args *args = opaque; | |
553 | ||
554 | inode->i_ino = args->ino; | |
555 | if (args->for_gc) { | |
556 | NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE; | |
557 | NILFS_I(inode)->i_cno = args->cno; | |
4d8d9293 RK |
558 | NILFS_I(inode)->i_root = NULL; |
559 | } else { | |
560 | if (args->root && args->ino == NILFS_ROOT_INO) | |
561 | nilfs_get_root(args->root); | |
562 | NILFS_I(inode)->i_root = args->root; | |
0e14a359 RK |
563 | } |
564 | return 0; | |
565 | } | |
566 | ||
032dbb3b RK |
567 | struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, |
568 | unsigned long ino) | |
569 | { | |
570 | struct nilfs_iget_args args = { | |
571 | .ino = ino, .root = root, .cno = 0, .for_gc = 0 | |
572 | }; | |
573 | ||
574 | return ilookup5(sb, ino, nilfs_iget_test, &args); | |
575 | } | |
576 | ||
f1e89c86 RK |
577 | struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, |
578 | unsigned long ino) | |
05fe58fd | 579 | { |
4d8d9293 RK |
580 | struct nilfs_iget_args args = { |
581 | .ino = ino, .root = root, .cno = 0, .for_gc = 0 | |
582 | }; | |
f1e89c86 RK |
583 | |
584 | return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); | |
585 | } | |
586 | ||
587 | struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, | |
588 | unsigned long ino) | |
589 | { | |
05fe58fd RK |
590 | struct inode *inode; |
591 | int err; | |
592 | ||
f1e89c86 | 593 | inode = nilfs_iget_locked(sb, root, ino); |
05fe58fd RK |
594 | if (unlikely(!inode)) |
595 | return ERR_PTR(-ENOMEM); | |
596 | if (!(inode->i_state & I_NEW)) | |
597 | return inode; | |
598 | ||
e912a5b6 | 599 | err = __nilfs_read_inode(sb, root, ino, inode); |
05fe58fd RK |
600 | if (unlikely(err)) { |
601 | iget_failed(inode); | |
602 | return ERR_PTR(err); | |
603 | } | |
604 | unlock_new_inode(inode); | |
605 | return inode; | |
606 | } | |
607 | ||
263d90ce RK |
608 | struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, |
609 | __u64 cno) | |
610 | { | |
4d8d9293 RK |
611 | struct nilfs_iget_args args = { |
612 | .ino = ino, .root = NULL, .cno = cno, .for_gc = 1 | |
613 | }; | |
263d90ce RK |
614 | struct inode *inode; |
615 | int err; | |
616 | ||
617 | inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); | |
618 | if (unlikely(!inode)) | |
619 | return ERR_PTR(-ENOMEM); | |
620 | if (!(inode->i_state & I_NEW)) | |
621 | return inode; | |
622 | ||
623 | err = nilfs_init_gcinode(inode); | |
624 | if (unlikely(err)) { | |
625 | iget_failed(inode); | |
626 | return ERR_PTR(err); | |
627 | } | |
628 | unlock_new_inode(inode); | |
629 | return inode; | |
630 | } | |
631 | ||
05fe58fd RK |
632 | void nilfs_write_inode_common(struct inode *inode, |
633 | struct nilfs_inode *raw_inode, int has_bmap) | |
634 | { | |
635 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
636 | ||
637 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
305d3d0d EB |
638 | raw_inode->i_uid = cpu_to_le32(i_uid_read(inode)); |
639 | raw_inode->i_gid = cpu_to_le32(i_gid_read(inode)); | |
05fe58fd RK |
640 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); |
641 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
642 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
643 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
644 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
645 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
646 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
647 | ||
05fe58fd RK |
648 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
649 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
650 | ||
56eb5538 RK |
651 | if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) { |
652 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
653 | ||
654 | /* zero-fill unused portion in the case of super root block */ | |
655 | raw_inode->i_xattr = 0; | |
656 | raw_inode->i_pad = 0; | |
657 | memset((void *)raw_inode + sizeof(*raw_inode), 0, | |
658 | nilfs->ns_inode_size - sizeof(*raw_inode)); | |
659 | } | |
660 | ||
05fe58fd RK |
661 | if (has_bmap) |
662 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
663 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
664 | raw_inode->i_device_code = | |
cdce214e | 665 | cpu_to_le64(huge_encode_dev(inode->i_rdev)); |
05fe58fd RK |
666 | /* When extending inode, nilfs->ns_inode_size should be checked |
667 | for substitutions of appended fields */ | |
668 | } | |
669 | ||
670 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
671 | { | |
672 | ino_t ino = inode->i_ino; | |
673 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e912a5b6 | 674 | struct inode *ifile = ii->i_root->ifile; |
05fe58fd RK |
675 | struct nilfs_inode *raw_inode; |
676 | ||
e912a5b6 | 677 | raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh); |
05fe58fd | 678 | |
05fe58fd | 679 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) |
e912a5b6 | 680 | memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size); |
05fe58fd RK |
681 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); |
682 | ||
683 | nilfs_write_inode_common(inode, raw_inode, 0); | |
684 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
685 | deadlock of bmap. This delays update of i_bmap to just | |
686 | before writing */ | |
e912a5b6 | 687 | nilfs_ifile_unmap_inode(ifile, ino, ibh); |
05fe58fd RK |
688 | } |
689 | ||
690 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
691 | ||
692 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
693 | unsigned long from) | |
694 | { | |
695 | unsigned long b; | |
696 | int ret; | |
697 | ||
698 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
699 | return; | |
e828949e | 700 | repeat: |
05fe58fd RK |
701 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); |
702 | if (ret == -ENOENT) | |
703 | return; | |
704 | else if (ret < 0) | |
705 | goto failed; | |
706 | ||
707 | if (b < from) | |
708 | return; | |
709 | ||
710 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
711 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
712 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
713 | if (!ret || (ret == -ENOMEM && | |
714 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
715 | goto repeat; | |
716 | ||
e828949e RK |
717 | failed: |
718 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
719 | "failed to truncate bmap (ino=%lu, err=%d)", | |
720 | ii->vfs_inode.i_ino, ret); | |
05fe58fd RK |
721 | } |
722 | ||
723 | void nilfs_truncate(struct inode *inode) | |
724 | { | |
725 | unsigned long blkoff; | |
726 | unsigned int blocksize; | |
727 | struct nilfs_transaction_info ti; | |
728 | struct super_block *sb = inode->i_sb; | |
729 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
730 | |
731 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
732 | return; | |
733 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
734 | return; | |
735 | ||
736 | blocksize = sb->s_blocksize; | |
737 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
1f5abe7e | 738 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
05fe58fd RK |
739 | |
740 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
741 | ||
742 | nilfs_truncate_bmap(ii, blkoff); | |
743 | ||
744 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
745 | if (IS_SYNC(inode)) | |
746 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
747 | ||
abdb318b | 748 | nilfs_mark_inode_dirty(inode); |
bcbc8c64 | 749 | nilfs_set_file_dirty(inode, 0); |
47420c79 | 750 | nilfs_transaction_commit(sb); |
05fe58fd RK |
751 | /* May construct a logical segment and may fail in sync mode. |
752 | But truncate has no return value. */ | |
753 | } | |
754 | ||
6fd1e5c9 AV |
755 | static void nilfs_clear_inode(struct inode *inode) |
756 | { | |
757 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
518d1a6a | 758 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
6fd1e5c9 AV |
759 | |
760 | /* | |
761 | * Free resources allocated in nilfs_read_inode(), here. | |
762 | */ | |
763 | BUG_ON(!list_empty(&ii->i_dirty)); | |
764 | brelse(ii->i_bh); | |
765 | ii->i_bh = NULL; | |
766 | ||
518d1a6a RK |
767 | if (mdi && mdi->mi_palloc_cache) |
768 | nilfs_palloc_destroy_cache(inode); | |
769 | ||
6fd1e5c9 AV |
770 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) |
771 | nilfs_bmap_clear(ii->i_bmap); | |
772 | ||
773 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
4d8d9293 RK |
774 | |
775 | if (ii->i_root && inode->i_ino == NILFS_ROOT_INO) | |
776 | nilfs_put_root(ii->i_root); | |
6fd1e5c9 AV |
777 | } |
778 | ||
779 | void nilfs_evict_inode(struct inode *inode) | |
05fe58fd RK |
780 | { |
781 | struct nilfs_transaction_info ti; | |
782 | struct super_block *sb = inode->i_sb; | |
783 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
25b18d39 | 784 | int ret; |
05fe58fd | 785 | |
4d8d9293 | 786 | if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) { |
91b0abe3 | 787 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 788 | clear_inode(inode); |
6fd1e5c9 | 789 | nilfs_clear_inode(inode); |
05fe58fd RK |
790 | return; |
791 | } | |
1f5abe7e RK |
792 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
793 | ||
91b0abe3 | 794 | truncate_inode_pages_final(&inode->i_data); |
05fe58fd | 795 | |
e912a5b6 | 796 | /* TODO: some of the following operations may fail. */ |
05fe58fd | 797 | nilfs_truncate_bmap(ii, 0); |
abdb318b | 798 | nilfs_mark_inode_dirty(inode); |
dbd5768f | 799 | clear_inode(inode); |
e912a5b6 | 800 | |
25b18d39 RK |
801 | ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino); |
802 | if (!ret) | |
e5f7f848 | 803 | atomic64_dec(&ii->i_root->inodes_count); |
e912a5b6 | 804 | |
6fd1e5c9 | 805 | nilfs_clear_inode(inode); |
e912a5b6 | 806 | |
05fe58fd RK |
807 | if (IS_SYNC(inode)) |
808 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 809 | nilfs_transaction_commit(sb); |
05fe58fd RK |
810 | /* May construct a logical segment and may fail in sync mode. |
811 | But delete_inode has no return value. */ | |
812 | } | |
813 | ||
814 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
815 | { | |
816 | struct nilfs_transaction_info ti; | |
817 | struct inode *inode = dentry->d_inode; | |
818 | struct super_block *sb = inode->i_sb; | |
47420c79 | 819 | int err; |
05fe58fd RK |
820 | |
821 | err = inode_change_ok(inode, iattr); | |
822 | if (err) | |
823 | return err; | |
824 | ||
825 | err = nilfs_transaction_begin(sb, &ti, 0); | |
826 | if (unlikely(err)) | |
827 | return err; | |
1025774c CH |
828 | |
829 | if ((iattr->ia_valid & ATTR_SIZE) && | |
830 | iattr->ia_size != i_size_read(inode)) { | |
562c72aa | 831 | inode_dio_wait(inode); |
2d1b399b MS |
832 | truncate_setsize(inode, iattr->ia_size); |
833 | nilfs_truncate(inode); | |
1025774c CH |
834 | } |
835 | ||
836 | setattr_copy(inode, iattr); | |
837 | mark_inode_dirty(inode); | |
838 | ||
839 | if (iattr->ia_valid & ATTR_MODE) { | |
05fe58fd | 840 | err = nilfs_acl_chmod(inode); |
1025774c CH |
841 | if (unlikely(err)) |
842 | goto out_err; | |
843 | } | |
844 | ||
845 | return nilfs_transaction_commit(sb); | |
47420c79 | 846 | |
1025774c CH |
847 | out_err: |
848 | nilfs_transaction_abort(sb); | |
47420c79 | 849 | return err; |
05fe58fd RK |
850 | } |
851 | ||
10556cb2 | 852 | int nilfs_permission(struct inode *inode, int mask) |
dc3d3b81 | 853 | { |
730e908f | 854 | struct nilfs_root *root = NILFS_I(inode)->i_root; |
dc3d3b81 RK |
855 | if ((mask & MAY_WRITE) && root && |
856 | root->cno != NILFS_CPTREE_CURRENT_CNO) | |
857 | return -EROFS; /* snapshot is not writable */ | |
858 | ||
2830ba7f | 859 | return generic_permission(inode, mask); |
dc3d3b81 RK |
860 | } |
861 | ||
bcbc8c64 | 862 | int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh) |
05fe58fd | 863 | { |
e3154e97 | 864 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd RK |
865 | struct nilfs_inode_info *ii = NILFS_I(inode); |
866 | int err; | |
867 | ||
693dd321 | 868 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd | 869 | if (ii->i_bh == NULL) { |
693dd321 | 870 | spin_unlock(&nilfs->ns_inode_lock); |
e912a5b6 RK |
871 | err = nilfs_ifile_get_inode_block(ii->i_root->ifile, |
872 | inode->i_ino, pbh); | |
05fe58fd RK |
873 | if (unlikely(err)) |
874 | return err; | |
693dd321 | 875 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
876 | if (ii->i_bh == NULL) |
877 | ii->i_bh = *pbh; | |
878 | else { | |
879 | brelse(*pbh); | |
880 | *pbh = ii->i_bh; | |
881 | } | |
882 | } else | |
883 | *pbh = ii->i_bh; | |
884 | ||
885 | get_bh(*pbh); | |
693dd321 | 886 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
887 | return 0; |
888 | } | |
889 | ||
890 | int nilfs_inode_dirty(struct inode *inode) | |
891 | { | |
892 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e3154e97 | 893 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd RK |
894 | int ret = 0; |
895 | ||
896 | if (!list_empty(&ii->i_dirty)) { | |
693dd321 | 897 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
898 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || |
899 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
693dd321 | 900 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
901 | } |
902 | return ret; | |
903 | } | |
904 | ||
bcbc8c64 | 905 | int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty) |
05fe58fd RK |
906 | { |
907 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e3154e97 | 908 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd | 909 | |
693dd321 | 910 | atomic_add(nr_dirty, &nilfs->ns_ndirtyblks); |
05fe58fd | 911 | |
458c5b08 | 912 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
913 | return 0; |
914 | ||
693dd321 | 915 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
916 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && |
917 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
918 | /* Because this routine may race with nilfs_dispose_list(), | |
919 | we have to check NILFS_I_QUEUED here, too. */ | |
920 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
921 | /* This will happen when somebody is freeing | |
922 | this inode. */ | |
693dd321 | 923 | nilfs_warning(inode->i_sb, __func__, |
05fe58fd RK |
924 | "cannot get inode (ino=%lu)\n", |
925 | inode->i_ino); | |
693dd321 | 926 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
927 | return -EINVAL; /* NILFS_I_DIRTY may remain for |
928 | freeing inode */ | |
929 | } | |
eaae0f37 | 930 | list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files); |
05fe58fd RK |
931 | set_bit(NILFS_I_QUEUED, &ii->i_state); |
932 | } | |
693dd321 | 933 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
934 | return 0; |
935 | } | |
936 | ||
937 | int nilfs_mark_inode_dirty(struct inode *inode) | |
938 | { | |
05fe58fd RK |
939 | struct buffer_head *ibh; |
940 | int err; | |
941 | ||
bcbc8c64 | 942 | err = nilfs_load_inode_block(inode, &ibh); |
05fe58fd RK |
943 | if (unlikely(err)) { |
944 | nilfs_warning(inode->i_sb, __func__, | |
945 | "failed to reget inode block.\n"); | |
946 | return err; | |
947 | } | |
05fe58fd | 948 | nilfs_update_inode(inode, ibh); |
5fc7b141 | 949 | mark_buffer_dirty(ibh); |
e912a5b6 | 950 | nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile); |
05fe58fd RK |
951 | brelse(ibh); |
952 | return 0; | |
953 | } | |
954 | ||
955 | /** | |
956 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
957 | * @inode: inode of the file to be registered. | |
958 | * | |
959 | * nilfs_dirty_inode() loads a inode block containing the specified | |
960 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
961 | * entry in the inode block. This operation is excluded from the segment | |
962 | * construction. This function can be called both as a single operation | |
963 | * and as a part of indivisible file operations. | |
964 | */ | |
aa385729 | 965 | void nilfs_dirty_inode(struct inode *inode, int flags) |
05fe58fd RK |
966 | { |
967 | struct nilfs_transaction_info ti; | |
7d6cd92f | 968 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
05fe58fd RK |
969 | |
970 | if (is_bad_inode(inode)) { | |
971 | nilfs_warning(inode->i_sb, __func__, | |
972 | "tried to mark bad_inode dirty. ignored.\n"); | |
973 | dump_stack(); | |
974 | return; | |
975 | } | |
7d6cd92f RK |
976 | if (mdi) { |
977 | nilfs_mdt_mark_dirty(inode); | |
978 | return; | |
979 | } | |
05fe58fd | 980 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
458c5b08 | 981 | nilfs_mark_inode_dirty(inode); |
47420c79 | 982 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 983 | } |
622daaff RK |
984 | |
985 | int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, | |
986 | __u64 start, __u64 len) | |
987 | { | |
0ef28f9a | 988 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
622daaff RK |
989 | __u64 logical = 0, phys = 0, size = 0; |
990 | __u32 flags = 0; | |
991 | loff_t isize; | |
992 | sector_t blkoff, end_blkoff; | |
993 | sector_t delalloc_blkoff; | |
994 | unsigned long delalloc_blklen; | |
995 | unsigned int blkbits = inode->i_blkbits; | |
996 | int ret, n; | |
997 | ||
998 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
999 | if (ret) | |
1000 | return ret; | |
1001 | ||
1002 | mutex_lock(&inode->i_mutex); | |
1003 | ||
1004 | isize = i_size_read(inode); | |
1005 | ||
1006 | blkoff = start >> blkbits; | |
1007 | end_blkoff = (start + len - 1) >> blkbits; | |
1008 | ||
1009 | delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff, | |
1010 | &delalloc_blkoff); | |
1011 | ||
1012 | do { | |
1013 | __u64 blkphy; | |
1014 | unsigned int maxblocks; | |
1015 | ||
1016 | if (delalloc_blklen && blkoff == delalloc_blkoff) { | |
1017 | if (size) { | |
1018 | /* End of the current extent */ | |
1019 | ret = fiemap_fill_next_extent( | |
1020 | fieinfo, logical, phys, size, flags); | |
1021 | if (ret) | |
1022 | break; | |
1023 | } | |
1024 | if (blkoff > end_blkoff) | |
1025 | break; | |
1026 | ||
1027 | flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC; | |
1028 | logical = blkoff << blkbits; | |
1029 | phys = 0; | |
1030 | size = delalloc_blklen << blkbits; | |
1031 | ||
1032 | blkoff = delalloc_blkoff + delalloc_blklen; | |
1033 | delalloc_blklen = nilfs_find_uncommitted_extent( | |
1034 | inode, blkoff, &delalloc_blkoff); | |
1035 | continue; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Limit the number of blocks that we look up so as | |
1040 | * not to get into the next delayed allocation extent. | |
1041 | */ | |
1042 | maxblocks = INT_MAX; | |
1043 | if (delalloc_blklen) | |
1044 | maxblocks = min_t(sector_t, delalloc_blkoff - blkoff, | |
1045 | maxblocks); | |
1046 | blkphy = 0; | |
1047 | ||
1048 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); | |
1049 | n = nilfs_bmap_lookup_contig( | |
1050 | NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks); | |
1051 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); | |
1052 | ||
1053 | if (n < 0) { | |
1054 | int past_eof; | |
1055 | ||
1056 | if (unlikely(n != -ENOENT)) | |
1057 | break; /* error */ | |
1058 | ||
1059 | /* HOLE */ | |
1060 | blkoff++; | |
1061 | past_eof = ((blkoff << blkbits) >= isize); | |
1062 | ||
1063 | if (size) { | |
1064 | /* End of the current extent */ | |
1065 | ||
1066 | if (past_eof) | |
1067 | flags |= FIEMAP_EXTENT_LAST; | |
1068 | ||
1069 | ret = fiemap_fill_next_extent( | |
1070 | fieinfo, logical, phys, size, flags); | |
1071 | if (ret) | |
1072 | break; | |
1073 | size = 0; | |
1074 | } | |
1075 | if (blkoff > end_blkoff || past_eof) | |
1076 | break; | |
1077 | } else { | |
1078 | if (size) { | |
1079 | if (phys && blkphy << blkbits == phys + size) { | |
1080 | /* The current extent goes on */ | |
1081 | size += n << blkbits; | |
1082 | } else { | |
1083 | /* Terminate the current extent */ | |
1084 | ret = fiemap_fill_next_extent( | |
1085 | fieinfo, logical, phys, size, | |
1086 | flags); | |
1087 | if (ret || blkoff > end_blkoff) | |
1088 | break; | |
1089 | ||
1090 | /* Start another extent */ | |
1091 | flags = FIEMAP_EXTENT_MERGED; | |
1092 | logical = blkoff << blkbits; | |
1093 | phys = blkphy << blkbits; | |
1094 | size = n << blkbits; | |
1095 | } | |
1096 | } else { | |
1097 | /* Start a new extent */ | |
1098 | flags = FIEMAP_EXTENT_MERGED; | |
1099 | logical = blkoff << blkbits; | |
1100 | phys = blkphy << blkbits; | |
1101 | size = n << blkbits; | |
1102 | } | |
1103 | blkoff += n; | |
1104 | } | |
1105 | cond_resched(); | |
1106 | } while (true); | |
1107 | ||
1108 | /* If ret is 1 then we just hit the end of the extent array */ | |
1109 | if (ret == 1) | |
1110 | ret = 0; | |
1111 | ||
1112 | mutex_unlock(&inode->i_mutex); | |
1113 | return ret; | |
1114 | } |