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 | ||
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) | |
57 | atomic_add(n, &root->blocks_count); | |
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) | |
66 | atomic_sub(n, &root->blocks_count); | |
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 | ||
178 | if (wbc->sync_mode == WB_SYNC_ALL) | |
179 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, | |
180 | wbc->range_start, | |
181 | wbc->range_end); | |
182 | return err; | |
05fe58fd RK |
183 | } |
184 | ||
185 | static int nilfs_writepage(struct page *page, struct writeback_control *wbc) | |
186 | { | |
187 | struct inode *inode = page->mapping->host; | |
188 | int err; | |
189 | ||
190 | redirty_page_for_writepage(wbc, page); | |
191 | unlock_page(page); | |
192 | ||
193 | if (wbc->sync_mode == WB_SYNC_ALL) { | |
194 | err = nilfs_construct_segment(inode->i_sb); | |
195 | if (unlikely(err)) | |
196 | return err; | |
197 | } else if (wbc->for_reclaim) | |
198 | nilfs_flush_segment(inode->i_sb, inode->i_ino); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static int nilfs_set_page_dirty(struct page *page) | |
204 | { | |
205 | int ret = __set_page_dirty_buffers(page); | |
206 | ||
207 | if (ret) { | |
208 | struct inode *inode = page->mapping->host; | |
05fe58fd RK |
209 | unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); |
210 | ||
bcbc8c64 | 211 | nilfs_set_file_dirty(inode, nr_dirty); |
05fe58fd RK |
212 | } |
213 | return ret; | |
214 | } | |
215 | ||
2d1b399b MS |
216 | void nilfs_write_failed(struct address_space *mapping, loff_t to) |
217 | { | |
218 | struct inode *inode = mapping->host; | |
219 | ||
220 | if (to > inode->i_size) { | |
221 | truncate_pagecache(inode, to, inode->i_size); | |
222 | nilfs_truncate(inode); | |
223 | } | |
224 | } | |
225 | ||
05fe58fd RK |
226 | static int nilfs_write_begin(struct file *file, struct address_space *mapping, |
227 | loff_t pos, unsigned len, unsigned flags, | |
228 | struct page **pagep, void **fsdata) | |
229 | ||
230 | { | |
231 | struct inode *inode = mapping->host; | |
232 | int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); | |
233 | ||
234 | if (unlikely(err)) | |
235 | return err; | |
236 | ||
155130a4 CH |
237 | err = block_write_begin(mapping, pos, len, flags, pagep, |
238 | nilfs_get_block); | |
239 | if (unlikely(err)) { | |
2d1b399b | 240 | nilfs_write_failed(mapping, pos + len); |
47420c79 | 241 | nilfs_transaction_abort(inode->i_sb); |
155130a4 | 242 | } |
05fe58fd RK |
243 | return err; |
244 | } | |
245 | ||
246 | static int nilfs_write_end(struct file *file, struct address_space *mapping, | |
247 | loff_t pos, unsigned len, unsigned copied, | |
248 | struct page *page, void *fsdata) | |
249 | { | |
250 | struct inode *inode = mapping->host; | |
251 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
252 | unsigned nr_dirty; | |
253 | int err; | |
254 | ||
255 | nr_dirty = nilfs_page_count_clean_buffers(page, start, | |
256 | start + copied); | |
257 | copied = generic_write_end(file, mapping, pos, len, copied, page, | |
258 | fsdata); | |
bcbc8c64 | 259 | nilfs_set_file_dirty(inode, nr_dirty); |
47420c79 | 260 | err = nilfs_transaction_commit(inode->i_sb); |
05fe58fd RK |
261 | return err ? : copied; |
262 | } | |
263 | ||
264 | static ssize_t | |
265 | nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, | |
266 | loff_t offset, unsigned long nr_segs) | |
267 | { | |
268 | struct file *file = iocb->ki_filp; | |
2d1b399b | 269 | struct address_space *mapping = file->f_mapping; |
05fe58fd RK |
270 | struct inode *inode = file->f_mapping->host; |
271 | ssize_t size; | |
05fe58fd RK |
272 | |
273 | if (rw == WRITE) | |
274 | return 0; | |
275 | ||
276 | /* Needs synchronization with the cleaner */ | |
aacfc19c CH |
277 | size = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, |
278 | nilfs_get_block); | |
eafdc7d1 CH |
279 | |
280 | /* | |
281 | * In case of error extending write may have instantiated a few | |
282 | * blocks outside i_size. Trim these off again. | |
283 | */ | |
284 | if (unlikely((rw & WRITE) && size < 0)) { | |
285 | loff_t isize = i_size_read(inode); | |
286 | loff_t end = offset + iov_length(iov, nr_segs); | |
287 | ||
288 | if (end > isize) | |
2d1b399b | 289 | nilfs_write_failed(mapping, end); |
eafdc7d1 CH |
290 | } |
291 | ||
05fe58fd RK |
292 | return size; |
293 | } | |
294 | ||
7f09410b | 295 | const struct address_space_operations nilfs_aops = { |
05fe58fd RK |
296 | .writepage = nilfs_writepage, |
297 | .readpage = nilfs_readpage, | |
05fe58fd RK |
298 | .writepages = nilfs_writepages, |
299 | .set_page_dirty = nilfs_set_page_dirty, | |
300 | .readpages = nilfs_readpages, | |
301 | .write_begin = nilfs_write_begin, | |
302 | .write_end = nilfs_write_end, | |
303 | /* .releasepage = nilfs_releasepage, */ | |
304 | .invalidatepage = block_invalidatepage, | |
305 | .direct_IO = nilfs_direct_IO, | |
258ef67e | 306 | .is_partially_uptodate = block_is_partially_uptodate, |
05fe58fd RK |
307 | }; |
308 | ||
c6e49e3f | 309 | struct inode *nilfs_new_inode(struct inode *dir, umode_t mode) |
05fe58fd RK |
310 | { |
311 | struct super_block *sb = dir->i_sb; | |
e3154e97 | 312 | struct the_nilfs *nilfs = sb->s_fs_info; |
05fe58fd RK |
313 | struct inode *inode; |
314 | struct nilfs_inode_info *ii; | |
4d8d9293 | 315 | struct nilfs_root *root; |
05fe58fd RK |
316 | int err = -ENOMEM; |
317 | ino_t ino; | |
318 | ||
319 | inode = new_inode(sb); | |
320 | if (unlikely(!inode)) | |
321 | goto failed; | |
322 | ||
323 | mapping_set_gfp_mask(inode->i_mapping, | |
324 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
325 | ||
4d8d9293 | 326 | root = NILFS_I(dir)->i_root; |
05fe58fd RK |
327 | ii = NILFS_I(inode); |
328 | ii->i_state = 1 << NILFS_I_NEW; | |
4d8d9293 | 329 | ii->i_root = root; |
05fe58fd | 330 | |
e912a5b6 | 331 | err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh); |
05fe58fd RK |
332 | if (unlikely(err)) |
333 | goto failed_ifile_create_inode; | |
334 | /* reference count of i_bh inherits from nilfs_mdt_read_block() */ | |
335 | ||
b7c06342 | 336 | atomic_inc(&root->inodes_count); |
73459dcc | 337 | inode_init_owner(inode, dir, mode); |
05fe58fd RK |
338 | inode->i_ino = ino; |
339 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
340 | ||
341 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { | |
342 | err = nilfs_bmap_read(ii->i_bmap, NULL); | |
343 | if (err < 0) | |
344 | goto failed_bmap; | |
345 | ||
346 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
347 | /* No lock is needed; iget() ensures it. */ | |
348 | } | |
349 | ||
b253a3e4 RK |
350 | ii->i_flags = nilfs_mask_flags( |
351 | mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED); | |
05fe58fd RK |
352 | |
353 | /* ii->i_file_acl = 0; */ | |
354 | /* ii->i_dir_acl = 0; */ | |
05fe58fd | 355 | ii->i_dir_start_lookup = 0; |
05fe58fd | 356 | nilfs_set_inode_flags(inode); |
9b1fc4e4 RK |
357 | spin_lock(&nilfs->ns_next_gen_lock); |
358 | inode->i_generation = nilfs->ns_next_generation++; | |
359 | spin_unlock(&nilfs->ns_next_gen_lock); | |
05fe58fd RK |
360 | insert_inode_hash(inode); |
361 | ||
362 | err = nilfs_init_acl(inode, dir); | |
363 | if (unlikely(err)) | |
364 | goto failed_acl; /* never occur. When supporting | |
365 | nilfs_init_acl(), proper cancellation of | |
366 | above jobs should be considered */ | |
367 | ||
05fe58fd RK |
368 | return inode; |
369 | ||
370 | failed_acl: | |
371 | failed_bmap: | |
6d6b77f1 | 372 | clear_nlink(inode); |
05fe58fd RK |
373 | iput(inode); /* raw_inode will be deleted through |
374 | generic_delete_inode() */ | |
375 | goto failed; | |
376 | ||
377 | failed_ifile_create_inode: | |
378 | make_bad_inode(inode); | |
379 | iput(inode); /* if i_nlink == 1, generic_forget_inode() will be | |
380 | called */ | |
381 | failed: | |
382 | return ERR_PTR(err); | |
383 | } | |
384 | ||
05fe58fd RK |
385 | void nilfs_set_inode_flags(struct inode *inode) |
386 | { | |
387 | unsigned int flags = NILFS_I(inode)->i_flags; | |
388 | ||
389 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | | |
390 | S_DIRSYNC); | |
f0c9f242 | 391 | if (flags & FS_SYNC_FL) |
05fe58fd | 392 | inode->i_flags |= S_SYNC; |
f0c9f242 | 393 | if (flags & FS_APPEND_FL) |
05fe58fd | 394 | inode->i_flags |= S_APPEND; |
f0c9f242 | 395 | if (flags & FS_IMMUTABLE_FL) |
05fe58fd | 396 | inode->i_flags |= S_IMMUTABLE; |
f0c9f242 | 397 | if (flags & FS_NOATIME_FL) |
05fe58fd | 398 | inode->i_flags |= S_NOATIME; |
f0c9f242 | 399 | if (flags & FS_DIRSYNC_FL) |
05fe58fd RK |
400 | inode->i_flags |= S_DIRSYNC; |
401 | mapping_set_gfp_mask(inode->i_mapping, | |
402 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
403 | } | |
404 | ||
405 | int nilfs_read_inode_common(struct inode *inode, | |
406 | struct nilfs_inode *raw_inode) | |
407 | { | |
408 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
409 | int err; | |
410 | ||
411 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
305d3d0d EB |
412 | i_uid_write(inode, le32_to_cpu(raw_inode->i_uid)); |
413 | i_gid_write(inode, le32_to_cpu(raw_inode->i_gid)); | |
bfe86848 | 414 | set_nlink(inode, le16_to_cpu(raw_inode->i_links_count)); |
05fe58fd RK |
415 | inode->i_size = le64_to_cpu(raw_inode->i_size); |
416 | inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
417 | inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); | |
418 | inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
61239230 RK |
419 | inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
420 | inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); | |
421 | inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); | |
422 | if (inode->i_nlink == 0 && inode->i_mode == 0) | |
05fe58fd RK |
423 | return -EINVAL; /* this inode is deleted */ |
424 | ||
425 | inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); | |
426 | ii->i_flags = le32_to_cpu(raw_inode->i_flags); | |
427 | #if 0 | |
428 | ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
429 | ii->i_dir_acl = S_ISREG(inode->i_mode) ? | |
430 | 0 : le32_to_cpu(raw_inode->i_dir_acl); | |
431 | #endif | |
3cc811bf | 432 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
433 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
434 | ||
435 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
436 | S_ISLNK(inode->i_mode)) { | |
437 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
438 | if (err < 0) | |
439 | return err; | |
440 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
441 | /* No lock is needed; iget() ensures it. */ | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
e912a5b6 RK |
446 | static int __nilfs_read_inode(struct super_block *sb, |
447 | struct nilfs_root *root, unsigned long ino, | |
05fe58fd RK |
448 | struct inode *inode) |
449 | { | |
e3154e97 | 450 | struct the_nilfs *nilfs = sb->s_fs_info; |
05fe58fd RK |
451 | struct buffer_head *bh; |
452 | struct nilfs_inode *raw_inode; | |
453 | int err; | |
454 | ||
365e215c | 455 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
e912a5b6 | 456 | err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh); |
05fe58fd RK |
457 | if (unlikely(err)) |
458 | goto bad_inode; | |
459 | ||
e912a5b6 | 460 | raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh); |
05fe58fd | 461 | |
1b2f5a64 RK |
462 | err = nilfs_read_inode_common(inode, raw_inode); |
463 | if (err) | |
05fe58fd RK |
464 | goto failed_unmap; |
465 | ||
466 | if (S_ISREG(inode->i_mode)) { | |
467 | inode->i_op = &nilfs_file_inode_operations; | |
468 | inode->i_fop = &nilfs_file_operations; | |
469 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
470 | } else if (S_ISDIR(inode->i_mode)) { |
471 | inode->i_op = &nilfs_dir_inode_operations; | |
472 | inode->i_fop = &nilfs_dir_operations; | |
473 | inode->i_mapping->a_ops = &nilfs_aops; | |
474 | } else if (S_ISLNK(inode->i_mode)) { | |
475 | inode->i_op = &nilfs_symlink_inode_operations; | |
476 | inode->i_mapping->a_ops = &nilfs_aops; | |
477 | } else { | |
478 | inode->i_op = &nilfs_special_inode_operations; | |
479 | init_special_inode( | |
480 | inode, inode->i_mode, | |
cdce214e | 481 | huge_decode_dev(le64_to_cpu(raw_inode->i_device_code))); |
05fe58fd | 482 | } |
e912a5b6 | 483 | nilfs_ifile_unmap_inode(root->ifile, ino, bh); |
05fe58fd | 484 | brelse(bh); |
365e215c | 485 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
05fe58fd RK |
486 | nilfs_set_inode_flags(inode); |
487 | return 0; | |
488 | ||
489 | failed_unmap: | |
e912a5b6 | 490 | nilfs_ifile_unmap_inode(root->ifile, ino, bh); |
05fe58fd RK |
491 | brelse(bh); |
492 | ||
493 | bad_inode: | |
365e215c | 494 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
05fe58fd RK |
495 | return err; |
496 | } | |
497 | ||
0e14a359 RK |
498 | static int nilfs_iget_test(struct inode *inode, void *opaque) |
499 | { | |
500 | struct nilfs_iget_args *args = opaque; | |
501 | struct nilfs_inode_info *ii; | |
502 | ||
4d8d9293 | 503 | if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root) |
0e14a359 RK |
504 | return 0; |
505 | ||
506 | ii = NILFS_I(inode); | |
507 | if (!test_bit(NILFS_I_GCINODE, &ii->i_state)) | |
508 | return !args->for_gc; | |
509 | ||
510 | return args->for_gc && args->cno == ii->i_cno; | |
511 | } | |
512 | ||
513 | static int nilfs_iget_set(struct inode *inode, void *opaque) | |
514 | { | |
515 | struct nilfs_iget_args *args = opaque; | |
516 | ||
517 | inode->i_ino = args->ino; | |
518 | if (args->for_gc) { | |
519 | NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE; | |
520 | NILFS_I(inode)->i_cno = args->cno; | |
4d8d9293 RK |
521 | NILFS_I(inode)->i_root = NULL; |
522 | } else { | |
523 | if (args->root && args->ino == NILFS_ROOT_INO) | |
524 | nilfs_get_root(args->root); | |
525 | NILFS_I(inode)->i_root = args->root; | |
0e14a359 RK |
526 | } |
527 | return 0; | |
528 | } | |
529 | ||
032dbb3b RK |
530 | struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, |
531 | unsigned long ino) | |
532 | { | |
533 | struct nilfs_iget_args args = { | |
534 | .ino = ino, .root = root, .cno = 0, .for_gc = 0 | |
535 | }; | |
536 | ||
537 | return ilookup5(sb, ino, nilfs_iget_test, &args); | |
538 | } | |
539 | ||
f1e89c86 RK |
540 | struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, |
541 | unsigned long ino) | |
05fe58fd | 542 | { |
4d8d9293 RK |
543 | struct nilfs_iget_args args = { |
544 | .ino = ino, .root = root, .cno = 0, .for_gc = 0 | |
545 | }; | |
f1e89c86 RK |
546 | |
547 | return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); | |
548 | } | |
549 | ||
550 | struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, | |
551 | unsigned long ino) | |
552 | { | |
05fe58fd RK |
553 | struct inode *inode; |
554 | int err; | |
555 | ||
f1e89c86 | 556 | inode = nilfs_iget_locked(sb, root, ino); |
05fe58fd RK |
557 | if (unlikely(!inode)) |
558 | return ERR_PTR(-ENOMEM); | |
559 | if (!(inode->i_state & I_NEW)) | |
560 | return inode; | |
561 | ||
e912a5b6 | 562 | err = __nilfs_read_inode(sb, root, ino, inode); |
05fe58fd RK |
563 | if (unlikely(err)) { |
564 | iget_failed(inode); | |
565 | return ERR_PTR(err); | |
566 | } | |
567 | unlock_new_inode(inode); | |
568 | return inode; | |
569 | } | |
570 | ||
263d90ce RK |
571 | struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, |
572 | __u64 cno) | |
573 | { | |
4d8d9293 RK |
574 | struct nilfs_iget_args args = { |
575 | .ino = ino, .root = NULL, .cno = cno, .for_gc = 1 | |
576 | }; | |
263d90ce RK |
577 | struct inode *inode; |
578 | int err; | |
579 | ||
580 | inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); | |
581 | if (unlikely(!inode)) | |
582 | return ERR_PTR(-ENOMEM); | |
583 | if (!(inode->i_state & I_NEW)) | |
584 | return inode; | |
585 | ||
586 | err = nilfs_init_gcinode(inode); | |
587 | if (unlikely(err)) { | |
588 | iget_failed(inode); | |
589 | return ERR_PTR(err); | |
590 | } | |
591 | unlock_new_inode(inode); | |
592 | return inode; | |
593 | } | |
594 | ||
05fe58fd RK |
595 | void nilfs_write_inode_common(struct inode *inode, |
596 | struct nilfs_inode *raw_inode, int has_bmap) | |
597 | { | |
598 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
599 | ||
600 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
305d3d0d EB |
601 | raw_inode->i_uid = cpu_to_le32(i_uid_read(inode)); |
602 | raw_inode->i_gid = cpu_to_le32(i_gid_read(inode)); | |
05fe58fd RK |
603 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); |
604 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
605 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
606 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
607 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
608 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
609 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
610 | ||
05fe58fd RK |
611 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
612 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
613 | ||
56eb5538 RK |
614 | if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) { |
615 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; | |
616 | ||
617 | /* zero-fill unused portion in the case of super root block */ | |
618 | raw_inode->i_xattr = 0; | |
619 | raw_inode->i_pad = 0; | |
620 | memset((void *)raw_inode + sizeof(*raw_inode), 0, | |
621 | nilfs->ns_inode_size - sizeof(*raw_inode)); | |
622 | } | |
623 | ||
05fe58fd RK |
624 | if (has_bmap) |
625 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
626 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
627 | raw_inode->i_device_code = | |
cdce214e | 628 | cpu_to_le64(huge_encode_dev(inode->i_rdev)); |
05fe58fd RK |
629 | /* When extending inode, nilfs->ns_inode_size should be checked |
630 | for substitutions of appended fields */ | |
631 | } | |
632 | ||
633 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
634 | { | |
635 | ino_t ino = inode->i_ino; | |
636 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e912a5b6 | 637 | struct inode *ifile = ii->i_root->ifile; |
05fe58fd RK |
638 | struct nilfs_inode *raw_inode; |
639 | ||
e912a5b6 | 640 | raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh); |
05fe58fd | 641 | |
05fe58fd | 642 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) |
e912a5b6 | 643 | memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size); |
05fe58fd RK |
644 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); |
645 | ||
646 | nilfs_write_inode_common(inode, raw_inode, 0); | |
647 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
648 | deadlock of bmap. This delays update of i_bmap to just | |
649 | before writing */ | |
e912a5b6 | 650 | nilfs_ifile_unmap_inode(ifile, ino, ibh); |
05fe58fd RK |
651 | } |
652 | ||
653 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
654 | ||
655 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
656 | unsigned long from) | |
657 | { | |
658 | unsigned long b; | |
659 | int ret; | |
660 | ||
661 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
662 | return; | |
e828949e | 663 | repeat: |
05fe58fd RK |
664 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); |
665 | if (ret == -ENOENT) | |
666 | return; | |
667 | else if (ret < 0) | |
668 | goto failed; | |
669 | ||
670 | if (b < from) | |
671 | return; | |
672 | ||
673 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
674 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
675 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
676 | if (!ret || (ret == -ENOMEM && | |
677 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
678 | goto repeat; | |
679 | ||
e828949e RK |
680 | failed: |
681 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
682 | "failed to truncate bmap (ino=%lu, err=%d)", | |
683 | ii->vfs_inode.i_ino, ret); | |
05fe58fd RK |
684 | } |
685 | ||
686 | void nilfs_truncate(struct inode *inode) | |
687 | { | |
688 | unsigned long blkoff; | |
689 | unsigned int blocksize; | |
690 | struct nilfs_transaction_info ti; | |
691 | struct super_block *sb = inode->i_sb; | |
692 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
693 | |
694 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
695 | return; | |
696 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
697 | return; | |
698 | ||
699 | blocksize = sb->s_blocksize; | |
700 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
1f5abe7e | 701 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
05fe58fd RK |
702 | |
703 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
704 | ||
705 | nilfs_truncate_bmap(ii, blkoff); | |
706 | ||
707 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
708 | if (IS_SYNC(inode)) | |
709 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
710 | ||
abdb318b | 711 | nilfs_mark_inode_dirty(inode); |
bcbc8c64 | 712 | nilfs_set_file_dirty(inode, 0); |
47420c79 | 713 | nilfs_transaction_commit(sb); |
05fe58fd RK |
714 | /* May construct a logical segment and may fail in sync mode. |
715 | But truncate has no return value. */ | |
716 | } | |
717 | ||
6fd1e5c9 AV |
718 | static void nilfs_clear_inode(struct inode *inode) |
719 | { | |
720 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
518d1a6a | 721 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
6fd1e5c9 AV |
722 | |
723 | /* | |
724 | * Free resources allocated in nilfs_read_inode(), here. | |
725 | */ | |
726 | BUG_ON(!list_empty(&ii->i_dirty)); | |
727 | brelse(ii->i_bh); | |
728 | ii->i_bh = NULL; | |
729 | ||
518d1a6a RK |
730 | if (mdi && mdi->mi_palloc_cache) |
731 | nilfs_palloc_destroy_cache(inode); | |
732 | ||
6fd1e5c9 AV |
733 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) |
734 | nilfs_bmap_clear(ii->i_bmap); | |
735 | ||
736 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
4d8d9293 RK |
737 | |
738 | if (ii->i_root && inode->i_ino == NILFS_ROOT_INO) | |
739 | nilfs_put_root(ii->i_root); | |
6fd1e5c9 AV |
740 | } |
741 | ||
742 | void nilfs_evict_inode(struct inode *inode) | |
05fe58fd RK |
743 | { |
744 | struct nilfs_transaction_info ti; | |
745 | struct super_block *sb = inode->i_sb; | |
746 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
25b18d39 | 747 | int ret; |
05fe58fd | 748 | |
4d8d9293 | 749 | if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) { |
05fe58fd RK |
750 | if (inode->i_data.nrpages) |
751 | truncate_inode_pages(&inode->i_data, 0); | |
dbd5768f | 752 | clear_inode(inode); |
6fd1e5c9 | 753 | nilfs_clear_inode(inode); |
05fe58fd RK |
754 | return; |
755 | } | |
1f5abe7e RK |
756 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
757 | ||
05fe58fd RK |
758 | if (inode->i_data.nrpages) |
759 | truncate_inode_pages(&inode->i_data, 0); | |
760 | ||
e912a5b6 | 761 | /* TODO: some of the following operations may fail. */ |
05fe58fd | 762 | nilfs_truncate_bmap(ii, 0); |
abdb318b | 763 | nilfs_mark_inode_dirty(inode); |
dbd5768f | 764 | clear_inode(inode); |
e912a5b6 | 765 | |
25b18d39 RK |
766 | ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino); |
767 | if (!ret) | |
768 | atomic_dec(&ii->i_root->inodes_count); | |
e912a5b6 | 769 | |
6fd1e5c9 | 770 | nilfs_clear_inode(inode); |
e912a5b6 | 771 | |
05fe58fd RK |
772 | if (IS_SYNC(inode)) |
773 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 774 | nilfs_transaction_commit(sb); |
05fe58fd RK |
775 | /* May construct a logical segment and may fail in sync mode. |
776 | But delete_inode has no return value. */ | |
777 | } | |
778 | ||
779 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
780 | { | |
781 | struct nilfs_transaction_info ti; | |
782 | struct inode *inode = dentry->d_inode; | |
783 | struct super_block *sb = inode->i_sb; | |
47420c79 | 784 | int err; |
05fe58fd RK |
785 | |
786 | err = inode_change_ok(inode, iattr); | |
787 | if (err) | |
788 | return err; | |
789 | ||
790 | err = nilfs_transaction_begin(sb, &ti, 0); | |
791 | if (unlikely(err)) | |
792 | return err; | |
1025774c CH |
793 | |
794 | if ((iattr->ia_valid & ATTR_SIZE) && | |
795 | iattr->ia_size != i_size_read(inode)) { | |
562c72aa | 796 | inode_dio_wait(inode); |
2d1b399b MS |
797 | truncate_setsize(inode, iattr->ia_size); |
798 | nilfs_truncate(inode); | |
1025774c CH |
799 | } |
800 | ||
801 | setattr_copy(inode, iattr); | |
802 | mark_inode_dirty(inode); | |
803 | ||
804 | if (iattr->ia_valid & ATTR_MODE) { | |
05fe58fd | 805 | err = nilfs_acl_chmod(inode); |
1025774c CH |
806 | if (unlikely(err)) |
807 | goto out_err; | |
808 | } | |
809 | ||
810 | return nilfs_transaction_commit(sb); | |
47420c79 | 811 | |
1025774c CH |
812 | out_err: |
813 | nilfs_transaction_abort(sb); | |
47420c79 | 814 | return err; |
05fe58fd RK |
815 | } |
816 | ||
10556cb2 | 817 | int nilfs_permission(struct inode *inode, int mask) |
dc3d3b81 | 818 | { |
730e908f | 819 | struct nilfs_root *root = NILFS_I(inode)->i_root; |
dc3d3b81 RK |
820 | if ((mask & MAY_WRITE) && root && |
821 | root->cno != NILFS_CPTREE_CURRENT_CNO) | |
822 | return -EROFS; /* snapshot is not writable */ | |
823 | ||
2830ba7f | 824 | return generic_permission(inode, mask); |
dc3d3b81 RK |
825 | } |
826 | ||
bcbc8c64 | 827 | int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh) |
05fe58fd | 828 | { |
e3154e97 | 829 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd RK |
830 | struct nilfs_inode_info *ii = NILFS_I(inode); |
831 | int err; | |
832 | ||
693dd321 | 833 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd | 834 | if (ii->i_bh == NULL) { |
693dd321 | 835 | spin_unlock(&nilfs->ns_inode_lock); |
e912a5b6 RK |
836 | err = nilfs_ifile_get_inode_block(ii->i_root->ifile, |
837 | inode->i_ino, pbh); | |
05fe58fd RK |
838 | if (unlikely(err)) |
839 | return err; | |
693dd321 | 840 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
841 | if (ii->i_bh == NULL) |
842 | ii->i_bh = *pbh; | |
843 | else { | |
844 | brelse(*pbh); | |
845 | *pbh = ii->i_bh; | |
846 | } | |
847 | } else | |
848 | *pbh = ii->i_bh; | |
849 | ||
850 | get_bh(*pbh); | |
693dd321 | 851 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
852 | return 0; |
853 | } | |
854 | ||
855 | int nilfs_inode_dirty(struct inode *inode) | |
856 | { | |
857 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e3154e97 | 858 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd RK |
859 | int ret = 0; |
860 | ||
861 | if (!list_empty(&ii->i_dirty)) { | |
693dd321 | 862 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
863 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || |
864 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
693dd321 | 865 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
866 | } |
867 | return ret; | |
868 | } | |
869 | ||
bcbc8c64 | 870 | int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty) |
05fe58fd RK |
871 | { |
872 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e3154e97 | 873 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd | 874 | |
693dd321 | 875 | atomic_add(nr_dirty, &nilfs->ns_ndirtyblks); |
05fe58fd | 876 | |
458c5b08 | 877 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
878 | return 0; |
879 | ||
693dd321 | 880 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
881 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && |
882 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
883 | /* Because this routine may race with nilfs_dispose_list(), | |
884 | we have to check NILFS_I_QUEUED here, too. */ | |
885 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
886 | /* This will happen when somebody is freeing | |
887 | this inode. */ | |
693dd321 | 888 | nilfs_warning(inode->i_sb, __func__, |
05fe58fd RK |
889 | "cannot get inode (ino=%lu)\n", |
890 | inode->i_ino); | |
693dd321 | 891 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
892 | return -EINVAL; /* NILFS_I_DIRTY may remain for |
893 | freeing inode */ | |
894 | } | |
eaae0f37 | 895 | list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files); |
05fe58fd RK |
896 | set_bit(NILFS_I_QUEUED, &ii->i_state); |
897 | } | |
693dd321 | 898 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
899 | return 0; |
900 | } | |
901 | ||
902 | int nilfs_mark_inode_dirty(struct inode *inode) | |
903 | { | |
05fe58fd RK |
904 | struct buffer_head *ibh; |
905 | int err; | |
906 | ||
bcbc8c64 | 907 | err = nilfs_load_inode_block(inode, &ibh); |
05fe58fd RK |
908 | if (unlikely(err)) { |
909 | nilfs_warning(inode->i_sb, __func__, | |
910 | "failed to reget inode block.\n"); | |
911 | return err; | |
912 | } | |
05fe58fd | 913 | nilfs_update_inode(inode, ibh); |
5fc7b141 | 914 | mark_buffer_dirty(ibh); |
e912a5b6 | 915 | nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile); |
05fe58fd RK |
916 | brelse(ibh); |
917 | return 0; | |
918 | } | |
919 | ||
920 | /** | |
921 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
922 | * @inode: inode of the file to be registered. | |
923 | * | |
924 | * nilfs_dirty_inode() loads a inode block containing the specified | |
925 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
926 | * entry in the inode block. This operation is excluded from the segment | |
927 | * construction. This function can be called both as a single operation | |
928 | * and as a part of indivisible file operations. | |
929 | */ | |
aa385729 | 930 | void nilfs_dirty_inode(struct inode *inode, int flags) |
05fe58fd RK |
931 | { |
932 | struct nilfs_transaction_info ti; | |
7d6cd92f | 933 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
05fe58fd RK |
934 | |
935 | if (is_bad_inode(inode)) { | |
936 | nilfs_warning(inode->i_sb, __func__, | |
937 | "tried to mark bad_inode dirty. ignored.\n"); | |
938 | dump_stack(); | |
939 | return; | |
940 | } | |
7d6cd92f RK |
941 | if (mdi) { |
942 | nilfs_mdt_mark_dirty(inode); | |
943 | return; | |
944 | } | |
05fe58fd | 945 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
458c5b08 | 946 | nilfs_mark_inode_dirty(inode); |
47420c79 | 947 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 948 | } |
622daaff RK |
949 | |
950 | int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, | |
951 | __u64 start, __u64 len) | |
952 | { | |
0ef28f9a | 953 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
622daaff RK |
954 | __u64 logical = 0, phys = 0, size = 0; |
955 | __u32 flags = 0; | |
956 | loff_t isize; | |
957 | sector_t blkoff, end_blkoff; | |
958 | sector_t delalloc_blkoff; | |
959 | unsigned long delalloc_blklen; | |
960 | unsigned int blkbits = inode->i_blkbits; | |
961 | int ret, n; | |
962 | ||
963 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
964 | if (ret) | |
965 | return ret; | |
966 | ||
967 | mutex_lock(&inode->i_mutex); | |
968 | ||
969 | isize = i_size_read(inode); | |
970 | ||
971 | blkoff = start >> blkbits; | |
972 | end_blkoff = (start + len - 1) >> blkbits; | |
973 | ||
974 | delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff, | |
975 | &delalloc_blkoff); | |
976 | ||
977 | do { | |
978 | __u64 blkphy; | |
979 | unsigned int maxblocks; | |
980 | ||
981 | if (delalloc_blklen && blkoff == delalloc_blkoff) { | |
982 | if (size) { | |
983 | /* End of the current extent */ | |
984 | ret = fiemap_fill_next_extent( | |
985 | fieinfo, logical, phys, size, flags); | |
986 | if (ret) | |
987 | break; | |
988 | } | |
989 | if (blkoff > end_blkoff) | |
990 | break; | |
991 | ||
992 | flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC; | |
993 | logical = blkoff << blkbits; | |
994 | phys = 0; | |
995 | size = delalloc_blklen << blkbits; | |
996 | ||
997 | blkoff = delalloc_blkoff + delalloc_blklen; | |
998 | delalloc_blklen = nilfs_find_uncommitted_extent( | |
999 | inode, blkoff, &delalloc_blkoff); | |
1000 | continue; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Limit the number of blocks that we look up so as | |
1005 | * not to get into the next delayed allocation extent. | |
1006 | */ | |
1007 | maxblocks = INT_MAX; | |
1008 | if (delalloc_blklen) | |
1009 | maxblocks = min_t(sector_t, delalloc_blkoff - blkoff, | |
1010 | maxblocks); | |
1011 | blkphy = 0; | |
1012 | ||
1013 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); | |
1014 | n = nilfs_bmap_lookup_contig( | |
1015 | NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks); | |
1016 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); | |
1017 | ||
1018 | if (n < 0) { | |
1019 | int past_eof; | |
1020 | ||
1021 | if (unlikely(n != -ENOENT)) | |
1022 | break; /* error */ | |
1023 | ||
1024 | /* HOLE */ | |
1025 | blkoff++; | |
1026 | past_eof = ((blkoff << blkbits) >= isize); | |
1027 | ||
1028 | if (size) { | |
1029 | /* End of the current extent */ | |
1030 | ||
1031 | if (past_eof) | |
1032 | flags |= FIEMAP_EXTENT_LAST; | |
1033 | ||
1034 | ret = fiemap_fill_next_extent( | |
1035 | fieinfo, logical, phys, size, flags); | |
1036 | if (ret) | |
1037 | break; | |
1038 | size = 0; | |
1039 | } | |
1040 | if (blkoff > end_blkoff || past_eof) | |
1041 | break; | |
1042 | } else { | |
1043 | if (size) { | |
1044 | if (phys && blkphy << blkbits == phys + size) { | |
1045 | /* The current extent goes on */ | |
1046 | size += n << blkbits; | |
1047 | } else { | |
1048 | /* Terminate the current extent */ | |
1049 | ret = fiemap_fill_next_extent( | |
1050 | fieinfo, logical, phys, size, | |
1051 | flags); | |
1052 | if (ret || blkoff > end_blkoff) | |
1053 | break; | |
1054 | ||
1055 | /* Start another extent */ | |
1056 | flags = FIEMAP_EXTENT_MERGED; | |
1057 | logical = blkoff << blkbits; | |
1058 | phys = blkphy << blkbits; | |
1059 | size = n << blkbits; | |
1060 | } | |
1061 | } else { | |
1062 | /* Start a new extent */ | |
1063 | flags = FIEMAP_EXTENT_MERGED; | |
1064 | logical = blkoff << blkbits; | |
1065 | phys = blkphy << blkbits; | |
1066 | size = n << blkbits; | |
1067 | } | |
1068 | blkoff += n; | |
1069 | } | |
1070 | cond_resched(); | |
1071 | } while (true); | |
1072 | ||
1073 | /* If ret is 1 then we just hit the end of the extent array */ | |
1074 | if (ret == 1) | |
1075 | ret = 0; | |
1076 | ||
1077 | mutex_unlock(&inode->i_mutex); | |
1078 | return ret; | |
1079 | } |