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