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> | |
f30bf3e4 | 28 | #include <linux/uio.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 | ||
0e14a359 RK |
37 | struct nilfs_iget_args { |
38 | u64 ino; | |
39 | __u64 cno; | |
4d8d9293 | 40 | struct nilfs_root *root; |
0e14a359 RK |
41 | int for_gc; |
42 | }; | |
05fe58fd | 43 | |
be667377 RK |
44 | void nilfs_inode_add_blocks(struct inode *inode, int n) |
45 | { | |
46 | struct nilfs_root *root = NILFS_I(inode)->i_root; | |
47 | ||
48 | inode_add_bytes(inode, (1 << inode->i_blkbits) * n); | |
49 | if (root) | |
50 | atomic_add(n, &root->blocks_count); | |
51 | } | |
52 | ||
53 | void nilfs_inode_sub_blocks(struct inode *inode, int n) | |
54 | { | |
55 | struct nilfs_root *root = NILFS_I(inode)->i_root; | |
56 | ||
57 | inode_sub_bytes(inode, (1 << inode->i_blkbits) * n); | |
58 | if (root) | |
59 | atomic_sub(n, &root->blocks_count); | |
60 | } | |
61 | ||
05fe58fd RK |
62 | /** |
63 | * nilfs_get_block() - get a file block on the filesystem (callback function) | |
64 | * @inode - inode struct of the target file | |
65 | * @blkoff - file block number | |
66 | * @bh_result - buffer head to be mapped on | |
67 | * @create - indicate whether allocating the block or not when it has not | |
68 | * been allocated yet. | |
69 | * | |
70 | * This function does not issue actual read request of the specified data | |
71 | * block. It is done by VFS. | |
05fe58fd RK |
72 | */ |
73 | int nilfs_get_block(struct inode *inode, sector_t blkoff, | |
74 | struct buffer_head *bh_result, int create) | |
75 | { | |
76 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
c3a7abf0 | 77 | __u64 blknum = 0; |
05fe58fd | 78 | int err = 0, ret; |
365e215c | 79 | struct inode *dat = NILFS_I_NILFS(inode)->ns_dat; |
c3a7abf0 | 80 | unsigned maxblocks = bh_result->b_size >> inode->i_blkbits; |
05fe58fd | 81 | |
c3a7abf0 RK |
82 | down_read(&NILFS_MDT(dat)->mi_sem); |
83 | ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks); | |
84 | up_read(&NILFS_MDT(dat)->mi_sem); | |
85 | if (ret >= 0) { /* found */ | |
05fe58fd | 86 | map_bh(bh_result, inode->i_sb, blknum); |
c3a7abf0 RK |
87 | if (ret > 0) |
88 | bh_result->b_size = (ret << inode->i_blkbits); | |
05fe58fd RK |
89 | goto out; |
90 | } | |
05fe58fd RK |
91 | /* data block was not found */ |
92 | if (ret == -ENOENT && create) { | |
93 | struct nilfs_transaction_info ti; | |
94 | ||
95 | bh_result->b_blocknr = 0; | |
96 | err = nilfs_transaction_begin(inode->i_sb, &ti, 1); | |
97 | if (unlikely(err)) | |
98 | goto out; | |
99 | err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff, | |
100 | (unsigned long)bh_result); | |
05fe58fd RK |
101 | if (unlikely(err != 0)) { |
102 | if (err == -EEXIST) { | |
103 | /* | |
104 | * The get_block() function could be called | |
105 | * from multiple callers for an inode. | |
106 | * However, the page having this block must | |
107 | * be locked in this case. | |
108 | */ | |
1f5abe7e | 109 | printk(KERN_WARNING |
05fe58fd RK |
110 | "nilfs_get_block: a race condition " |
111 | "while inserting a data block. " | |
112 | "(inode number=%lu, file block " | |
113 | "offset=%llu)\n", | |
114 | inode->i_ino, | |
115 | (unsigned long long)blkoff); | |
1f5abe7e | 116 | err = 0; |
05fe58fd | 117 | } |
47420c79 | 118 | nilfs_transaction_abort(inode->i_sb); |
05fe58fd RK |
119 | goto out; |
120 | } | |
abdb318b | 121 | nilfs_mark_inode_dirty(inode); |
47420c79 | 122 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd RK |
123 | /* Error handling should be detailed */ |
124 | set_buffer_new(bh_result); | |
27e6c7a3 | 125 | set_buffer_delay(bh_result); |
05fe58fd RK |
126 | map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed |
127 | to proper value */ | |
128 | } else if (ret == -ENOENT) { | |
129 | /* not found is not error (e.g. hole); must return without | |
130 | the mapped state flag. */ | |
131 | ; | |
132 | } else { | |
133 | err = ret; | |
134 | } | |
135 | ||
136 | out: | |
137 | return err; | |
138 | } | |
139 | ||
140 | /** | |
141 | * nilfs_readpage() - implement readpage() method of nilfs_aops {} | |
142 | * address_space_operations. | |
143 | * @file - file struct of the file to be read | |
144 | * @page - the page to be read | |
145 | */ | |
146 | static int nilfs_readpage(struct file *file, struct page *page) | |
147 | { | |
148 | return mpage_readpage(page, nilfs_get_block); | |
149 | } | |
150 | ||
151 | /** | |
152 | * nilfs_readpages() - implement readpages() method of nilfs_aops {} | |
153 | * address_space_operations. | |
154 | * @file - file struct of the file to be read | |
155 | * @mapping - address_space struct used for reading multiple pages | |
156 | * @pages - the pages to be read | |
157 | * @nr_pages - number of pages to be read | |
158 | */ | |
159 | static int nilfs_readpages(struct file *file, struct address_space *mapping, | |
160 | struct list_head *pages, unsigned nr_pages) | |
161 | { | |
162 | return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); | |
163 | } | |
164 | ||
165 | static int nilfs_writepages(struct address_space *mapping, | |
166 | struct writeback_control *wbc) | |
167 | { | |
f30bf3e4 RK |
168 | struct inode *inode = mapping->host; |
169 | int err = 0; | |
170 | ||
171 | if (wbc->sync_mode == WB_SYNC_ALL) | |
172 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, | |
173 | wbc->range_start, | |
174 | wbc->range_end); | |
175 | return err; | |
05fe58fd RK |
176 | } |
177 | ||
178 | static int nilfs_writepage(struct page *page, struct writeback_control *wbc) | |
179 | { | |
180 | struct inode *inode = page->mapping->host; | |
181 | int err; | |
182 | ||
183 | redirty_page_for_writepage(wbc, page); | |
184 | unlock_page(page); | |
185 | ||
186 | if (wbc->sync_mode == WB_SYNC_ALL) { | |
187 | err = nilfs_construct_segment(inode->i_sb); | |
188 | if (unlikely(err)) | |
189 | return err; | |
190 | } else if (wbc->for_reclaim) | |
191 | nilfs_flush_segment(inode->i_sb, inode->i_ino); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static int nilfs_set_page_dirty(struct page *page) | |
197 | { | |
198 | int ret = __set_page_dirty_buffers(page); | |
199 | ||
200 | if (ret) { | |
201 | struct inode *inode = page->mapping->host; | |
05fe58fd RK |
202 | unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); |
203 | ||
bcbc8c64 | 204 | nilfs_set_file_dirty(inode, nr_dirty); |
05fe58fd RK |
205 | } |
206 | return ret; | |
207 | } | |
208 | ||
209 | static int nilfs_write_begin(struct file *file, struct address_space *mapping, | |
210 | loff_t pos, unsigned len, unsigned flags, | |
211 | struct page **pagep, void **fsdata) | |
212 | ||
213 | { | |
214 | struct inode *inode = mapping->host; | |
215 | int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); | |
216 | ||
217 | if (unlikely(err)) | |
218 | return err; | |
219 | ||
155130a4 CH |
220 | err = block_write_begin(mapping, pos, len, flags, pagep, |
221 | nilfs_get_block); | |
222 | if (unlikely(err)) { | |
223 | loff_t isize = mapping->host->i_size; | |
224 | if (pos + len > isize) | |
225 | vmtruncate(mapping->host, isize); | |
226 | ||
47420c79 | 227 | nilfs_transaction_abort(inode->i_sb); |
155130a4 | 228 | } |
05fe58fd RK |
229 | return err; |
230 | } | |
231 | ||
232 | static int nilfs_write_end(struct file *file, struct address_space *mapping, | |
233 | loff_t pos, unsigned len, unsigned copied, | |
234 | struct page *page, void *fsdata) | |
235 | { | |
236 | struct inode *inode = mapping->host; | |
237 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
238 | unsigned nr_dirty; | |
239 | int err; | |
240 | ||
241 | nr_dirty = nilfs_page_count_clean_buffers(page, start, | |
242 | start + copied); | |
243 | copied = generic_write_end(file, mapping, pos, len, copied, page, | |
244 | fsdata); | |
bcbc8c64 | 245 | nilfs_set_file_dirty(inode, nr_dirty); |
47420c79 | 246 | err = nilfs_transaction_commit(inode->i_sb); |
05fe58fd RK |
247 | return err ? : copied; |
248 | } | |
249 | ||
250 | static ssize_t | |
251 | nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, | |
252 | loff_t offset, unsigned long nr_segs) | |
253 | { | |
254 | struct file *file = iocb->ki_filp; | |
255 | struct inode *inode = file->f_mapping->host; | |
256 | ssize_t size; | |
05fe58fd RK |
257 | |
258 | if (rw == WRITE) | |
259 | return 0; | |
260 | ||
261 | /* Needs synchronization with the cleaner */ | |
262 | size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
263 | offset, nr_segs, nilfs_get_block, NULL); | |
eafdc7d1 CH |
264 | |
265 | /* | |
266 | * In case of error extending write may have instantiated a few | |
267 | * blocks outside i_size. Trim these off again. | |
268 | */ | |
269 | if (unlikely((rw & WRITE) && size < 0)) { | |
270 | loff_t isize = i_size_read(inode); | |
271 | loff_t end = offset + iov_length(iov, nr_segs); | |
272 | ||
273 | if (end > isize) | |
274 | vmtruncate(inode, isize); | |
275 | } | |
276 | ||
05fe58fd RK |
277 | return size; |
278 | } | |
279 | ||
7f09410b | 280 | const struct address_space_operations nilfs_aops = { |
05fe58fd RK |
281 | .writepage = nilfs_writepage, |
282 | .readpage = nilfs_readpage, | |
e85dc1d5 | 283 | .sync_page = block_sync_page, |
05fe58fd RK |
284 | .writepages = nilfs_writepages, |
285 | .set_page_dirty = nilfs_set_page_dirty, | |
286 | .readpages = nilfs_readpages, | |
287 | .write_begin = nilfs_write_begin, | |
288 | .write_end = nilfs_write_end, | |
289 | /* .releasepage = nilfs_releasepage, */ | |
290 | .invalidatepage = block_invalidatepage, | |
291 | .direct_IO = nilfs_direct_IO, | |
258ef67e | 292 | .is_partially_uptodate = block_is_partially_uptodate, |
05fe58fd RK |
293 | }; |
294 | ||
295 | struct inode *nilfs_new_inode(struct inode *dir, int mode) | |
296 | { | |
297 | struct super_block *sb = dir->i_sb; | |
298 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
299 | struct inode *inode; | |
300 | struct nilfs_inode_info *ii; | |
4d8d9293 | 301 | struct nilfs_root *root; |
05fe58fd RK |
302 | int err = -ENOMEM; |
303 | ino_t ino; | |
304 | ||
305 | inode = new_inode(sb); | |
306 | if (unlikely(!inode)) | |
307 | goto failed; | |
308 | ||
309 | mapping_set_gfp_mask(inode->i_mapping, | |
310 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
311 | ||
4d8d9293 | 312 | root = NILFS_I(dir)->i_root; |
05fe58fd RK |
313 | ii = NILFS_I(inode); |
314 | ii->i_state = 1 << NILFS_I_NEW; | |
4d8d9293 | 315 | ii->i_root = root; |
05fe58fd | 316 | |
e912a5b6 | 317 | err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh); |
05fe58fd RK |
318 | if (unlikely(err)) |
319 | goto failed_ifile_create_inode; | |
320 | /* reference count of i_bh inherits from nilfs_mdt_read_block() */ | |
321 | ||
b7c06342 | 322 | atomic_inc(&root->inodes_count); |
73459dcc | 323 | inode_init_owner(inode, dir, mode); |
05fe58fd RK |
324 | inode->i_ino = ino; |
325 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
326 | ||
327 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { | |
328 | err = nilfs_bmap_read(ii->i_bmap, NULL); | |
329 | if (err < 0) | |
330 | goto failed_bmap; | |
331 | ||
332 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
333 | /* No lock is needed; iget() ensures it. */ | |
334 | } | |
335 | ||
b253a3e4 RK |
336 | ii->i_flags = nilfs_mask_flags( |
337 | mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED); | |
05fe58fd RK |
338 | |
339 | /* ii->i_file_acl = 0; */ | |
340 | /* ii->i_dir_acl = 0; */ | |
05fe58fd | 341 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
342 | nilfs_set_inode_flags(inode); |
343 | spin_lock(&sbi->s_next_gen_lock); | |
344 | inode->i_generation = sbi->s_next_generation++; | |
345 | spin_unlock(&sbi->s_next_gen_lock); | |
346 | insert_inode_hash(inode); | |
347 | ||
348 | err = nilfs_init_acl(inode, dir); | |
349 | if (unlikely(err)) | |
350 | goto failed_acl; /* never occur. When supporting | |
351 | nilfs_init_acl(), proper cancellation of | |
352 | above jobs should be considered */ | |
353 | ||
05fe58fd RK |
354 | return inode; |
355 | ||
356 | failed_acl: | |
357 | failed_bmap: | |
358 | inode->i_nlink = 0; | |
359 | iput(inode); /* raw_inode will be deleted through | |
360 | generic_delete_inode() */ | |
361 | goto failed; | |
362 | ||
363 | failed_ifile_create_inode: | |
364 | make_bad_inode(inode); | |
365 | iput(inode); /* if i_nlink == 1, generic_forget_inode() will be | |
366 | called */ | |
367 | failed: | |
368 | return ERR_PTR(err); | |
369 | } | |
370 | ||
05fe58fd RK |
371 | void nilfs_set_inode_flags(struct inode *inode) |
372 | { | |
373 | unsigned int flags = NILFS_I(inode)->i_flags; | |
374 | ||
375 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | | |
376 | S_DIRSYNC); | |
f0c9f242 | 377 | if (flags & FS_SYNC_FL) |
05fe58fd | 378 | inode->i_flags |= S_SYNC; |
f0c9f242 | 379 | if (flags & FS_APPEND_FL) |
05fe58fd | 380 | inode->i_flags |= S_APPEND; |
f0c9f242 | 381 | if (flags & FS_IMMUTABLE_FL) |
05fe58fd | 382 | inode->i_flags |= S_IMMUTABLE; |
f0c9f242 | 383 | if (flags & FS_NOATIME_FL) |
05fe58fd | 384 | inode->i_flags |= S_NOATIME; |
f0c9f242 | 385 | if (flags & FS_DIRSYNC_FL) |
05fe58fd RK |
386 | inode->i_flags |= S_DIRSYNC; |
387 | mapping_set_gfp_mask(inode->i_mapping, | |
388 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
389 | } | |
390 | ||
391 | int nilfs_read_inode_common(struct inode *inode, | |
392 | struct nilfs_inode *raw_inode) | |
393 | { | |
394 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
395 | int err; | |
396 | ||
397 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
398 | inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid); | |
399 | inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid); | |
400 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
401 | inode->i_size = le64_to_cpu(raw_inode->i_size); | |
402 | inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
403 | inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); | |
404 | inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
61239230 RK |
405 | inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
406 | inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); | |
407 | inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); | |
408 | if (inode->i_nlink == 0 && inode->i_mode == 0) | |
05fe58fd RK |
409 | return -EINVAL; /* this inode is deleted */ |
410 | ||
411 | inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); | |
412 | ii->i_flags = le32_to_cpu(raw_inode->i_flags); | |
413 | #if 0 | |
414 | ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
415 | ii->i_dir_acl = S_ISREG(inode->i_mode) ? | |
416 | 0 : le32_to_cpu(raw_inode->i_dir_acl); | |
417 | #endif | |
3cc811bf | 418 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
419 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
420 | ||
421 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
422 | S_ISLNK(inode->i_mode)) { | |
423 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
424 | if (err < 0) | |
425 | return err; | |
426 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
427 | /* No lock is needed; iget() ensures it. */ | |
428 | } | |
429 | return 0; | |
430 | } | |
431 | ||
e912a5b6 RK |
432 | static int __nilfs_read_inode(struct super_block *sb, |
433 | struct nilfs_root *root, unsigned long ino, | |
05fe58fd RK |
434 | struct inode *inode) |
435 | { | |
365e215c | 436 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
05fe58fd RK |
437 | struct buffer_head *bh; |
438 | struct nilfs_inode *raw_inode; | |
439 | int err; | |
440 | ||
365e215c | 441 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
e912a5b6 | 442 | err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh); |
05fe58fd RK |
443 | if (unlikely(err)) |
444 | goto bad_inode; | |
445 | ||
e912a5b6 | 446 | raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh); |
05fe58fd | 447 | |
1b2f5a64 RK |
448 | err = nilfs_read_inode_common(inode, raw_inode); |
449 | if (err) | |
05fe58fd RK |
450 | goto failed_unmap; |
451 | ||
452 | if (S_ISREG(inode->i_mode)) { | |
453 | inode->i_op = &nilfs_file_inode_operations; | |
454 | inode->i_fop = &nilfs_file_operations; | |
455 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
456 | } else if (S_ISDIR(inode->i_mode)) { |
457 | inode->i_op = &nilfs_dir_inode_operations; | |
458 | inode->i_fop = &nilfs_dir_operations; | |
459 | inode->i_mapping->a_ops = &nilfs_aops; | |
460 | } else if (S_ISLNK(inode->i_mode)) { | |
461 | inode->i_op = &nilfs_symlink_inode_operations; | |
462 | inode->i_mapping->a_ops = &nilfs_aops; | |
463 | } else { | |
464 | inode->i_op = &nilfs_special_inode_operations; | |
465 | init_special_inode( | |
466 | inode, inode->i_mode, | |
cdce214e | 467 | huge_decode_dev(le64_to_cpu(raw_inode->i_device_code))); |
05fe58fd | 468 | } |
e912a5b6 | 469 | nilfs_ifile_unmap_inode(root->ifile, ino, bh); |
05fe58fd | 470 | brelse(bh); |
365e215c | 471 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
05fe58fd RK |
472 | nilfs_set_inode_flags(inode); |
473 | return 0; | |
474 | ||
475 | failed_unmap: | |
e912a5b6 | 476 | nilfs_ifile_unmap_inode(root->ifile, ino, bh); |
05fe58fd RK |
477 | brelse(bh); |
478 | ||
479 | bad_inode: | |
365e215c | 480 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
05fe58fd RK |
481 | return err; |
482 | } | |
483 | ||
0e14a359 RK |
484 | static int nilfs_iget_test(struct inode *inode, void *opaque) |
485 | { | |
486 | struct nilfs_iget_args *args = opaque; | |
487 | struct nilfs_inode_info *ii; | |
488 | ||
4d8d9293 | 489 | if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root) |
0e14a359 RK |
490 | return 0; |
491 | ||
492 | ii = NILFS_I(inode); | |
493 | if (!test_bit(NILFS_I_GCINODE, &ii->i_state)) | |
494 | return !args->for_gc; | |
495 | ||
496 | return args->for_gc && args->cno == ii->i_cno; | |
497 | } | |
498 | ||
499 | static int nilfs_iget_set(struct inode *inode, void *opaque) | |
500 | { | |
501 | struct nilfs_iget_args *args = opaque; | |
502 | ||
503 | inode->i_ino = args->ino; | |
504 | if (args->for_gc) { | |
505 | NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE; | |
506 | NILFS_I(inode)->i_cno = args->cno; | |
4d8d9293 RK |
507 | NILFS_I(inode)->i_root = NULL; |
508 | } else { | |
509 | if (args->root && args->ino == NILFS_ROOT_INO) | |
510 | nilfs_get_root(args->root); | |
511 | NILFS_I(inode)->i_root = args->root; | |
0e14a359 RK |
512 | } |
513 | return 0; | |
514 | } | |
515 | ||
032dbb3b RK |
516 | struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, |
517 | unsigned long ino) | |
518 | { | |
519 | struct nilfs_iget_args args = { | |
520 | .ino = ino, .root = root, .cno = 0, .for_gc = 0 | |
521 | }; | |
522 | ||
523 | return ilookup5(sb, ino, nilfs_iget_test, &args); | |
524 | } | |
525 | ||
f1e89c86 RK |
526 | struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, |
527 | unsigned long ino) | |
05fe58fd | 528 | { |
4d8d9293 RK |
529 | struct nilfs_iget_args args = { |
530 | .ino = ino, .root = root, .cno = 0, .for_gc = 0 | |
531 | }; | |
f1e89c86 RK |
532 | |
533 | return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); | |
534 | } | |
535 | ||
536 | struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, | |
537 | unsigned long ino) | |
538 | { | |
05fe58fd RK |
539 | struct inode *inode; |
540 | int err; | |
541 | ||
f1e89c86 | 542 | inode = nilfs_iget_locked(sb, root, ino); |
05fe58fd RK |
543 | if (unlikely(!inode)) |
544 | return ERR_PTR(-ENOMEM); | |
545 | if (!(inode->i_state & I_NEW)) | |
546 | return inode; | |
547 | ||
e912a5b6 | 548 | err = __nilfs_read_inode(sb, root, ino, inode); |
05fe58fd RK |
549 | if (unlikely(err)) { |
550 | iget_failed(inode); | |
551 | return ERR_PTR(err); | |
552 | } | |
553 | unlock_new_inode(inode); | |
554 | return inode; | |
555 | } | |
556 | ||
263d90ce RK |
557 | struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, |
558 | __u64 cno) | |
559 | { | |
4d8d9293 RK |
560 | struct nilfs_iget_args args = { |
561 | .ino = ino, .root = NULL, .cno = cno, .for_gc = 1 | |
562 | }; | |
263d90ce RK |
563 | struct inode *inode; |
564 | int err; | |
565 | ||
566 | inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); | |
567 | if (unlikely(!inode)) | |
568 | return ERR_PTR(-ENOMEM); | |
569 | if (!(inode->i_state & I_NEW)) | |
570 | return inode; | |
571 | ||
572 | err = nilfs_init_gcinode(inode); | |
573 | if (unlikely(err)) { | |
574 | iget_failed(inode); | |
575 | return ERR_PTR(err); | |
576 | } | |
577 | unlock_new_inode(inode); | |
578 | return inode; | |
579 | } | |
580 | ||
05fe58fd RK |
581 | void nilfs_write_inode_common(struct inode *inode, |
582 | struct nilfs_inode *raw_inode, int has_bmap) | |
583 | { | |
584 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
585 | ||
586 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
587 | raw_inode->i_uid = cpu_to_le32(inode->i_uid); | |
588 | raw_inode->i_gid = cpu_to_le32(inode->i_gid); | |
589 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
590 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
591 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
592 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
593 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
594 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
595 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
596 | ||
05fe58fd RK |
597 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
598 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
599 | ||
600 | if (has_bmap) | |
601 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
602 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
603 | raw_inode->i_device_code = | |
cdce214e | 604 | cpu_to_le64(huge_encode_dev(inode->i_rdev)); |
05fe58fd RK |
605 | /* When extending inode, nilfs->ns_inode_size should be checked |
606 | for substitutions of appended fields */ | |
607 | } | |
608 | ||
609 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
610 | { | |
611 | ino_t ino = inode->i_ino; | |
612 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e912a5b6 | 613 | struct inode *ifile = ii->i_root->ifile; |
05fe58fd RK |
614 | struct nilfs_inode *raw_inode; |
615 | ||
e912a5b6 | 616 | raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh); |
05fe58fd | 617 | |
05fe58fd | 618 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) |
e912a5b6 | 619 | memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size); |
05fe58fd RK |
620 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); |
621 | ||
622 | nilfs_write_inode_common(inode, raw_inode, 0); | |
623 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
624 | deadlock of bmap. This delays update of i_bmap to just | |
625 | before writing */ | |
e912a5b6 | 626 | nilfs_ifile_unmap_inode(ifile, ino, ibh); |
05fe58fd RK |
627 | } |
628 | ||
629 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
630 | ||
631 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
632 | unsigned long from) | |
633 | { | |
634 | unsigned long b; | |
635 | int ret; | |
636 | ||
637 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
638 | return; | |
e828949e | 639 | repeat: |
05fe58fd RK |
640 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); |
641 | if (ret == -ENOENT) | |
642 | return; | |
643 | else if (ret < 0) | |
644 | goto failed; | |
645 | ||
646 | if (b < from) | |
647 | return; | |
648 | ||
649 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
650 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
651 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
652 | if (!ret || (ret == -ENOMEM && | |
653 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
654 | goto repeat; | |
655 | ||
e828949e RK |
656 | failed: |
657 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
658 | "failed to truncate bmap (ino=%lu, err=%d)", | |
659 | ii->vfs_inode.i_ino, ret); | |
05fe58fd RK |
660 | } |
661 | ||
662 | void nilfs_truncate(struct inode *inode) | |
663 | { | |
664 | unsigned long blkoff; | |
665 | unsigned int blocksize; | |
666 | struct nilfs_transaction_info ti; | |
667 | struct super_block *sb = inode->i_sb; | |
668 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
669 | |
670 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
671 | return; | |
672 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
673 | return; | |
674 | ||
675 | blocksize = sb->s_blocksize; | |
676 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
1f5abe7e | 677 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
05fe58fd RK |
678 | |
679 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
680 | ||
681 | nilfs_truncate_bmap(ii, blkoff); | |
682 | ||
683 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
684 | if (IS_SYNC(inode)) | |
685 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
686 | ||
abdb318b | 687 | nilfs_mark_inode_dirty(inode); |
bcbc8c64 | 688 | nilfs_set_file_dirty(inode, 0); |
47420c79 | 689 | nilfs_transaction_commit(sb); |
05fe58fd RK |
690 | /* May construct a logical segment and may fail in sync mode. |
691 | But truncate has no return value. */ | |
692 | } | |
693 | ||
6fd1e5c9 AV |
694 | static void nilfs_clear_inode(struct inode *inode) |
695 | { | |
696 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
518d1a6a | 697 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
6fd1e5c9 AV |
698 | |
699 | /* | |
700 | * Free resources allocated in nilfs_read_inode(), here. | |
701 | */ | |
702 | BUG_ON(!list_empty(&ii->i_dirty)); | |
703 | brelse(ii->i_bh); | |
704 | ii->i_bh = NULL; | |
705 | ||
518d1a6a RK |
706 | if (mdi && mdi->mi_palloc_cache) |
707 | nilfs_palloc_destroy_cache(inode); | |
708 | ||
6fd1e5c9 AV |
709 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) |
710 | nilfs_bmap_clear(ii->i_bmap); | |
711 | ||
712 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
4d8d9293 RK |
713 | |
714 | if (ii->i_root && inode->i_ino == NILFS_ROOT_INO) | |
715 | nilfs_put_root(ii->i_root); | |
6fd1e5c9 AV |
716 | } |
717 | ||
718 | void nilfs_evict_inode(struct inode *inode) | |
05fe58fd RK |
719 | { |
720 | struct nilfs_transaction_info ti; | |
721 | struct super_block *sb = inode->i_sb; | |
722 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
25b18d39 | 723 | int ret; |
05fe58fd | 724 | |
4d8d9293 | 725 | if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) { |
05fe58fd RK |
726 | if (inode->i_data.nrpages) |
727 | truncate_inode_pages(&inode->i_data, 0); | |
6fd1e5c9 AV |
728 | end_writeback(inode); |
729 | nilfs_clear_inode(inode); | |
05fe58fd RK |
730 | return; |
731 | } | |
1f5abe7e RK |
732 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
733 | ||
05fe58fd RK |
734 | if (inode->i_data.nrpages) |
735 | truncate_inode_pages(&inode->i_data, 0); | |
736 | ||
e912a5b6 | 737 | /* TODO: some of the following operations may fail. */ |
05fe58fd | 738 | nilfs_truncate_bmap(ii, 0); |
abdb318b | 739 | nilfs_mark_inode_dirty(inode); |
6fd1e5c9 | 740 | end_writeback(inode); |
e912a5b6 | 741 | |
25b18d39 RK |
742 | ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino); |
743 | if (!ret) | |
744 | atomic_dec(&ii->i_root->inodes_count); | |
e912a5b6 | 745 | |
6fd1e5c9 | 746 | nilfs_clear_inode(inode); |
e912a5b6 | 747 | |
05fe58fd RK |
748 | if (IS_SYNC(inode)) |
749 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 750 | nilfs_transaction_commit(sb); |
05fe58fd RK |
751 | /* May construct a logical segment and may fail in sync mode. |
752 | But delete_inode has no return value. */ | |
753 | } | |
754 | ||
755 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
756 | { | |
757 | struct nilfs_transaction_info ti; | |
758 | struct inode *inode = dentry->d_inode; | |
759 | struct super_block *sb = inode->i_sb; | |
47420c79 | 760 | int err; |
05fe58fd RK |
761 | |
762 | err = inode_change_ok(inode, iattr); | |
763 | if (err) | |
764 | return err; | |
765 | ||
766 | err = nilfs_transaction_begin(sb, &ti, 0); | |
767 | if (unlikely(err)) | |
768 | return err; | |
1025774c CH |
769 | |
770 | if ((iattr->ia_valid & ATTR_SIZE) && | |
771 | iattr->ia_size != i_size_read(inode)) { | |
772 | err = vmtruncate(inode, iattr->ia_size); | |
773 | if (unlikely(err)) | |
774 | goto out_err; | |
775 | } | |
776 | ||
777 | setattr_copy(inode, iattr); | |
778 | mark_inode_dirty(inode); | |
779 | ||
780 | if (iattr->ia_valid & ATTR_MODE) { | |
05fe58fd | 781 | err = nilfs_acl_chmod(inode); |
1025774c CH |
782 | if (unlikely(err)) |
783 | goto out_err; | |
784 | } | |
785 | ||
786 | return nilfs_transaction_commit(sb); | |
47420c79 | 787 | |
1025774c CH |
788 | out_err: |
789 | nilfs_transaction_abort(sb); | |
47420c79 | 790 | return err; |
05fe58fd RK |
791 | } |
792 | ||
b74c79e9 | 793 | int nilfs_permission(struct inode *inode, int mask, unsigned int flags) |
dc3d3b81 | 794 | { |
b74c79e9 NP |
795 | struct nilfs_root *root; |
796 | ||
797 | if (flags & IPERM_FLAG_RCU) | |
798 | return -ECHILD; | |
dc3d3b81 | 799 | |
b74c79e9 | 800 | root = NILFS_I(inode)->i_root; |
dc3d3b81 RK |
801 | if ((mask & MAY_WRITE) && root && |
802 | root->cno != NILFS_CPTREE_CURRENT_CNO) | |
803 | return -EROFS; /* snapshot is not writable */ | |
804 | ||
b74c79e9 | 805 | return generic_permission(inode, mask, flags, NULL); |
dc3d3b81 RK |
806 | } |
807 | ||
bcbc8c64 | 808 | int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh) |
05fe58fd | 809 | { |
bcbc8c64 | 810 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); |
05fe58fd RK |
811 | struct nilfs_inode_info *ii = NILFS_I(inode); |
812 | int err; | |
813 | ||
814 | spin_lock(&sbi->s_inode_lock); | |
05fe58fd RK |
815 | if (ii->i_bh == NULL) { |
816 | spin_unlock(&sbi->s_inode_lock); | |
e912a5b6 RK |
817 | err = nilfs_ifile_get_inode_block(ii->i_root->ifile, |
818 | inode->i_ino, pbh); | |
05fe58fd RK |
819 | if (unlikely(err)) |
820 | return err; | |
821 | spin_lock(&sbi->s_inode_lock); | |
822 | if (ii->i_bh == NULL) | |
823 | ii->i_bh = *pbh; | |
824 | else { | |
825 | brelse(*pbh); | |
826 | *pbh = ii->i_bh; | |
827 | } | |
828 | } else | |
829 | *pbh = ii->i_bh; | |
830 | ||
831 | get_bh(*pbh); | |
832 | spin_unlock(&sbi->s_inode_lock); | |
833 | return 0; | |
834 | } | |
835 | ||
836 | int nilfs_inode_dirty(struct inode *inode) | |
837 | { | |
838 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
839 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
840 | int ret = 0; | |
841 | ||
842 | if (!list_empty(&ii->i_dirty)) { | |
843 | spin_lock(&sbi->s_inode_lock); | |
844 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || | |
845 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
846 | spin_unlock(&sbi->s_inode_lock); | |
847 | } | |
848 | return ret; | |
849 | } | |
850 | ||
bcbc8c64 | 851 | int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty) |
05fe58fd | 852 | { |
bcbc8c64 | 853 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); |
05fe58fd RK |
854 | struct nilfs_inode_info *ii = NILFS_I(inode); |
855 | ||
856 | atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); | |
857 | ||
458c5b08 | 858 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
859 | return 0; |
860 | ||
861 | spin_lock(&sbi->s_inode_lock); | |
862 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && | |
863 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
864 | /* Because this routine may race with nilfs_dispose_list(), | |
865 | we have to check NILFS_I_QUEUED here, too. */ | |
866 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
867 | /* This will happen when somebody is freeing | |
868 | this inode. */ | |
869 | nilfs_warning(sbi->s_super, __func__, | |
870 | "cannot get inode (ino=%lu)\n", | |
871 | inode->i_ino); | |
872 | spin_unlock(&sbi->s_inode_lock); | |
873 | return -EINVAL; /* NILFS_I_DIRTY may remain for | |
874 | freeing inode */ | |
875 | } | |
876 | list_del(&ii->i_dirty); | |
877 | list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); | |
878 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
879 | } | |
880 | spin_unlock(&sbi->s_inode_lock); | |
881 | return 0; | |
882 | } | |
883 | ||
884 | int nilfs_mark_inode_dirty(struct inode *inode) | |
885 | { | |
05fe58fd RK |
886 | struct buffer_head *ibh; |
887 | int err; | |
888 | ||
bcbc8c64 | 889 | err = nilfs_load_inode_block(inode, &ibh); |
05fe58fd RK |
890 | if (unlikely(err)) { |
891 | nilfs_warning(inode->i_sb, __func__, | |
892 | "failed to reget inode block.\n"); | |
893 | return err; | |
894 | } | |
05fe58fd | 895 | nilfs_update_inode(inode, ibh); |
05fe58fd | 896 | nilfs_mdt_mark_buffer_dirty(ibh); |
e912a5b6 | 897 | nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile); |
05fe58fd RK |
898 | brelse(ibh); |
899 | return 0; | |
900 | } | |
901 | ||
902 | /** | |
903 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
904 | * @inode: inode of the file to be registered. | |
905 | * | |
906 | * nilfs_dirty_inode() loads a inode block containing the specified | |
907 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
908 | * entry in the inode block. This operation is excluded from the segment | |
909 | * construction. This function can be called both as a single operation | |
910 | * and as a part of indivisible file operations. | |
911 | */ | |
912 | void nilfs_dirty_inode(struct inode *inode) | |
913 | { | |
914 | struct nilfs_transaction_info ti; | |
7d6cd92f | 915 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
05fe58fd RK |
916 | |
917 | if (is_bad_inode(inode)) { | |
918 | nilfs_warning(inode->i_sb, __func__, | |
919 | "tried to mark bad_inode dirty. ignored.\n"); | |
920 | dump_stack(); | |
921 | return; | |
922 | } | |
7d6cd92f RK |
923 | if (mdi) { |
924 | nilfs_mdt_mark_dirty(inode); | |
925 | return; | |
926 | } | |
05fe58fd | 927 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
458c5b08 | 928 | nilfs_mark_inode_dirty(inode); |
47420c79 | 929 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 930 | } |
622daaff RK |
931 | |
932 | int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, | |
933 | __u64 start, __u64 len) | |
934 | { | |
935 | struct the_nilfs *nilfs = NILFS_I_NILFS(inode); | |
936 | __u64 logical = 0, phys = 0, size = 0; | |
937 | __u32 flags = 0; | |
938 | loff_t isize; | |
939 | sector_t blkoff, end_blkoff; | |
940 | sector_t delalloc_blkoff; | |
941 | unsigned long delalloc_blklen; | |
942 | unsigned int blkbits = inode->i_blkbits; | |
943 | int ret, n; | |
944 | ||
945 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
946 | if (ret) | |
947 | return ret; | |
948 | ||
949 | mutex_lock(&inode->i_mutex); | |
950 | ||
951 | isize = i_size_read(inode); | |
952 | ||
953 | blkoff = start >> blkbits; | |
954 | end_blkoff = (start + len - 1) >> blkbits; | |
955 | ||
956 | delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff, | |
957 | &delalloc_blkoff); | |
958 | ||
959 | do { | |
960 | __u64 blkphy; | |
961 | unsigned int maxblocks; | |
962 | ||
963 | if (delalloc_blklen && blkoff == delalloc_blkoff) { | |
964 | if (size) { | |
965 | /* End of the current extent */ | |
966 | ret = fiemap_fill_next_extent( | |
967 | fieinfo, logical, phys, size, flags); | |
968 | if (ret) | |
969 | break; | |
970 | } | |
971 | if (blkoff > end_blkoff) | |
972 | break; | |
973 | ||
974 | flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC; | |
975 | logical = blkoff << blkbits; | |
976 | phys = 0; | |
977 | size = delalloc_blklen << blkbits; | |
978 | ||
979 | blkoff = delalloc_blkoff + delalloc_blklen; | |
980 | delalloc_blklen = nilfs_find_uncommitted_extent( | |
981 | inode, blkoff, &delalloc_blkoff); | |
982 | continue; | |
983 | } | |
984 | ||
985 | /* | |
986 | * Limit the number of blocks that we look up so as | |
987 | * not to get into the next delayed allocation extent. | |
988 | */ | |
989 | maxblocks = INT_MAX; | |
990 | if (delalloc_blklen) | |
991 | maxblocks = min_t(sector_t, delalloc_blkoff - blkoff, | |
992 | maxblocks); | |
993 | blkphy = 0; | |
994 | ||
995 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); | |
996 | n = nilfs_bmap_lookup_contig( | |
997 | NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks); | |
998 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); | |
999 | ||
1000 | if (n < 0) { | |
1001 | int past_eof; | |
1002 | ||
1003 | if (unlikely(n != -ENOENT)) | |
1004 | break; /* error */ | |
1005 | ||
1006 | /* HOLE */ | |
1007 | blkoff++; | |
1008 | past_eof = ((blkoff << blkbits) >= isize); | |
1009 | ||
1010 | if (size) { | |
1011 | /* End of the current extent */ | |
1012 | ||
1013 | if (past_eof) | |
1014 | flags |= FIEMAP_EXTENT_LAST; | |
1015 | ||
1016 | ret = fiemap_fill_next_extent( | |
1017 | fieinfo, logical, phys, size, flags); | |
1018 | if (ret) | |
1019 | break; | |
1020 | size = 0; | |
1021 | } | |
1022 | if (blkoff > end_blkoff || past_eof) | |
1023 | break; | |
1024 | } else { | |
1025 | if (size) { | |
1026 | if (phys && blkphy << blkbits == phys + size) { | |
1027 | /* The current extent goes on */ | |
1028 | size += n << blkbits; | |
1029 | } else { | |
1030 | /* Terminate the current extent */ | |
1031 | ret = fiemap_fill_next_extent( | |
1032 | fieinfo, logical, phys, size, | |
1033 | flags); | |
1034 | if (ret || blkoff > end_blkoff) | |
1035 | break; | |
1036 | ||
1037 | /* Start another extent */ | |
1038 | flags = FIEMAP_EXTENT_MERGED; | |
1039 | logical = blkoff << blkbits; | |
1040 | phys = blkphy << blkbits; | |
1041 | size = n << blkbits; | |
1042 | } | |
1043 | } else { | |
1044 | /* Start a new extent */ | |
1045 | flags = FIEMAP_EXTENT_MERGED; | |
1046 | logical = blkoff << blkbits; | |
1047 | phys = blkphy << blkbits; | |
1048 | size = n << blkbits; | |
1049 | } | |
1050 | blkoff += n; | |
1051 | } | |
1052 | cond_resched(); | |
1053 | } while (true); | |
1054 | ||
1055 | /* If ret is 1 then we just hit the end of the extent array */ | |
1056 | if (ret == 1) | |
1057 | ret = 0; | |
1058 | ||
1059 | mutex_unlock(&inode->i_mutex); | |
1060 | return ret; | |
1061 | } |