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, | |
05fe58fd RK |
283 | .writepages = nilfs_writepages, |
284 | .set_page_dirty = nilfs_set_page_dirty, | |
285 | .readpages = nilfs_readpages, | |
286 | .write_begin = nilfs_write_begin, | |
287 | .write_end = nilfs_write_end, | |
288 | /* .releasepage = nilfs_releasepage, */ | |
289 | .invalidatepage = block_invalidatepage, | |
290 | .direct_IO = nilfs_direct_IO, | |
258ef67e | 291 | .is_partially_uptodate = block_is_partially_uptodate, |
05fe58fd RK |
292 | }; |
293 | ||
294 | struct inode *nilfs_new_inode(struct inode *dir, int mode) | |
295 | { | |
296 | struct super_block *sb = dir->i_sb; | |
e3154e97 | 297 | struct the_nilfs *nilfs = sb->s_fs_info; |
05fe58fd RK |
298 | struct inode *inode; |
299 | struct nilfs_inode_info *ii; | |
4d8d9293 | 300 | struct nilfs_root *root; |
05fe58fd RK |
301 | int err = -ENOMEM; |
302 | ino_t ino; | |
303 | ||
304 | inode = new_inode(sb); | |
305 | if (unlikely(!inode)) | |
306 | goto failed; | |
307 | ||
308 | mapping_set_gfp_mask(inode->i_mapping, | |
309 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
310 | ||
4d8d9293 | 311 | root = NILFS_I(dir)->i_root; |
05fe58fd RK |
312 | ii = NILFS_I(inode); |
313 | ii->i_state = 1 << NILFS_I_NEW; | |
4d8d9293 | 314 | ii->i_root = root; |
05fe58fd | 315 | |
e912a5b6 | 316 | err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh); |
05fe58fd RK |
317 | if (unlikely(err)) |
318 | goto failed_ifile_create_inode; | |
319 | /* reference count of i_bh inherits from nilfs_mdt_read_block() */ | |
320 | ||
b7c06342 | 321 | atomic_inc(&root->inodes_count); |
73459dcc | 322 | inode_init_owner(inode, dir, mode); |
05fe58fd RK |
323 | inode->i_ino = ino; |
324 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
325 | ||
326 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { | |
327 | err = nilfs_bmap_read(ii->i_bmap, NULL); | |
328 | if (err < 0) | |
329 | goto failed_bmap; | |
330 | ||
331 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
332 | /* No lock is needed; iget() ensures it. */ | |
333 | } | |
334 | ||
b253a3e4 RK |
335 | ii->i_flags = nilfs_mask_flags( |
336 | mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED); | |
05fe58fd RK |
337 | |
338 | /* ii->i_file_acl = 0; */ | |
339 | /* ii->i_dir_acl = 0; */ | |
05fe58fd | 340 | ii->i_dir_start_lookup = 0; |
05fe58fd | 341 | nilfs_set_inode_flags(inode); |
9b1fc4e4 RK |
342 | spin_lock(&nilfs->ns_next_gen_lock); |
343 | inode->i_generation = nilfs->ns_next_generation++; | |
344 | spin_unlock(&nilfs->ns_next_gen_lock); | |
05fe58fd RK |
345 | insert_inode_hash(inode); |
346 | ||
347 | err = nilfs_init_acl(inode, dir); | |
348 | if (unlikely(err)) | |
349 | goto failed_acl; /* never occur. When supporting | |
350 | nilfs_init_acl(), proper cancellation of | |
351 | above jobs should be considered */ | |
352 | ||
05fe58fd RK |
353 | return inode; |
354 | ||
355 | failed_acl: | |
356 | failed_bmap: | |
357 | inode->i_nlink = 0; | |
358 | iput(inode); /* raw_inode will be deleted through | |
359 | generic_delete_inode() */ | |
360 | goto failed; | |
361 | ||
362 | failed_ifile_create_inode: | |
363 | make_bad_inode(inode); | |
364 | iput(inode); /* if i_nlink == 1, generic_forget_inode() will be | |
365 | called */ | |
366 | failed: | |
367 | return ERR_PTR(err); | |
368 | } | |
369 | ||
05fe58fd RK |
370 | void nilfs_set_inode_flags(struct inode *inode) |
371 | { | |
372 | unsigned int flags = NILFS_I(inode)->i_flags; | |
373 | ||
374 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | | |
375 | S_DIRSYNC); | |
f0c9f242 | 376 | if (flags & FS_SYNC_FL) |
05fe58fd | 377 | inode->i_flags |= S_SYNC; |
f0c9f242 | 378 | if (flags & FS_APPEND_FL) |
05fe58fd | 379 | inode->i_flags |= S_APPEND; |
f0c9f242 | 380 | if (flags & FS_IMMUTABLE_FL) |
05fe58fd | 381 | inode->i_flags |= S_IMMUTABLE; |
f0c9f242 | 382 | if (flags & FS_NOATIME_FL) |
05fe58fd | 383 | inode->i_flags |= S_NOATIME; |
f0c9f242 | 384 | if (flags & FS_DIRSYNC_FL) |
05fe58fd RK |
385 | inode->i_flags |= S_DIRSYNC; |
386 | mapping_set_gfp_mask(inode->i_mapping, | |
387 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
388 | } | |
389 | ||
390 | int nilfs_read_inode_common(struct inode *inode, | |
391 | struct nilfs_inode *raw_inode) | |
392 | { | |
393 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
394 | int err; | |
395 | ||
396 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
397 | inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid); | |
398 | inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid); | |
399 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
400 | inode->i_size = le64_to_cpu(raw_inode->i_size); | |
401 | inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
402 | inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); | |
403 | inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
61239230 RK |
404 | inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
405 | inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); | |
406 | inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); | |
407 | if (inode->i_nlink == 0 && inode->i_mode == 0) | |
05fe58fd RK |
408 | return -EINVAL; /* this inode is deleted */ |
409 | ||
410 | inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); | |
411 | ii->i_flags = le32_to_cpu(raw_inode->i_flags); | |
412 | #if 0 | |
413 | ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
414 | ii->i_dir_acl = S_ISREG(inode->i_mode) ? | |
415 | 0 : le32_to_cpu(raw_inode->i_dir_acl); | |
416 | #endif | |
3cc811bf | 417 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
418 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
419 | ||
420 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
421 | S_ISLNK(inode->i_mode)) { | |
422 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
423 | if (err < 0) | |
424 | return err; | |
425 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
426 | /* No lock is needed; iget() ensures it. */ | |
427 | } | |
428 | return 0; | |
429 | } | |
430 | ||
e912a5b6 RK |
431 | static int __nilfs_read_inode(struct super_block *sb, |
432 | struct nilfs_root *root, unsigned long ino, | |
05fe58fd RK |
433 | struct inode *inode) |
434 | { | |
e3154e97 | 435 | struct the_nilfs *nilfs = sb->s_fs_info; |
05fe58fd RK |
436 | struct buffer_head *bh; |
437 | struct nilfs_inode *raw_inode; | |
438 | int err; | |
439 | ||
365e215c | 440 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
e912a5b6 | 441 | err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh); |
05fe58fd RK |
442 | if (unlikely(err)) |
443 | goto bad_inode; | |
444 | ||
e912a5b6 | 445 | raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh); |
05fe58fd | 446 | |
1b2f5a64 RK |
447 | err = nilfs_read_inode_common(inode, raw_inode); |
448 | if (err) | |
05fe58fd RK |
449 | goto failed_unmap; |
450 | ||
451 | if (S_ISREG(inode->i_mode)) { | |
452 | inode->i_op = &nilfs_file_inode_operations; | |
453 | inode->i_fop = &nilfs_file_operations; | |
454 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
455 | } else if (S_ISDIR(inode->i_mode)) { |
456 | inode->i_op = &nilfs_dir_inode_operations; | |
457 | inode->i_fop = &nilfs_dir_operations; | |
458 | inode->i_mapping->a_ops = &nilfs_aops; | |
459 | } else if (S_ISLNK(inode->i_mode)) { | |
460 | inode->i_op = &nilfs_symlink_inode_operations; | |
461 | inode->i_mapping->a_ops = &nilfs_aops; | |
462 | } else { | |
463 | inode->i_op = &nilfs_special_inode_operations; | |
464 | init_special_inode( | |
465 | inode, inode->i_mode, | |
cdce214e | 466 | huge_decode_dev(le64_to_cpu(raw_inode->i_device_code))); |
05fe58fd | 467 | } |
e912a5b6 | 468 | nilfs_ifile_unmap_inode(root->ifile, ino, bh); |
05fe58fd | 469 | brelse(bh); |
365e215c | 470 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
05fe58fd RK |
471 | nilfs_set_inode_flags(inode); |
472 | return 0; | |
473 | ||
474 | failed_unmap: | |
e912a5b6 | 475 | nilfs_ifile_unmap_inode(root->ifile, ino, bh); |
05fe58fd RK |
476 | brelse(bh); |
477 | ||
478 | bad_inode: | |
365e215c | 479 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
05fe58fd RK |
480 | return err; |
481 | } | |
482 | ||
0e14a359 RK |
483 | static int nilfs_iget_test(struct inode *inode, void *opaque) |
484 | { | |
485 | struct nilfs_iget_args *args = opaque; | |
486 | struct nilfs_inode_info *ii; | |
487 | ||
4d8d9293 | 488 | if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root) |
0e14a359 RK |
489 | return 0; |
490 | ||
491 | ii = NILFS_I(inode); | |
492 | if (!test_bit(NILFS_I_GCINODE, &ii->i_state)) | |
493 | return !args->for_gc; | |
494 | ||
495 | return args->for_gc && args->cno == ii->i_cno; | |
496 | } | |
497 | ||
498 | static int nilfs_iget_set(struct inode *inode, void *opaque) | |
499 | { | |
500 | struct nilfs_iget_args *args = opaque; | |
501 | ||
502 | inode->i_ino = args->ino; | |
503 | if (args->for_gc) { | |
504 | NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE; | |
505 | NILFS_I(inode)->i_cno = args->cno; | |
4d8d9293 RK |
506 | NILFS_I(inode)->i_root = NULL; |
507 | } else { | |
508 | if (args->root && args->ino == NILFS_ROOT_INO) | |
509 | nilfs_get_root(args->root); | |
510 | NILFS_I(inode)->i_root = args->root; | |
0e14a359 RK |
511 | } |
512 | return 0; | |
513 | } | |
514 | ||
032dbb3b RK |
515 | struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, |
516 | unsigned long ino) | |
517 | { | |
518 | struct nilfs_iget_args args = { | |
519 | .ino = ino, .root = root, .cno = 0, .for_gc = 0 | |
520 | }; | |
521 | ||
522 | return ilookup5(sb, ino, nilfs_iget_test, &args); | |
523 | } | |
524 | ||
f1e89c86 RK |
525 | struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, |
526 | unsigned long ino) | |
05fe58fd | 527 | { |
4d8d9293 RK |
528 | struct nilfs_iget_args args = { |
529 | .ino = ino, .root = root, .cno = 0, .for_gc = 0 | |
530 | }; | |
f1e89c86 RK |
531 | |
532 | return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); | |
533 | } | |
534 | ||
535 | struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, | |
536 | unsigned long ino) | |
537 | { | |
05fe58fd RK |
538 | struct inode *inode; |
539 | int err; | |
540 | ||
f1e89c86 | 541 | inode = nilfs_iget_locked(sb, root, ino); |
05fe58fd RK |
542 | if (unlikely(!inode)) |
543 | return ERR_PTR(-ENOMEM); | |
544 | if (!(inode->i_state & I_NEW)) | |
545 | return inode; | |
546 | ||
e912a5b6 | 547 | err = __nilfs_read_inode(sb, root, ino, inode); |
05fe58fd RK |
548 | if (unlikely(err)) { |
549 | iget_failed(inode); | |
550 | return ERR_PTR(err); | |
551 | } | |
552 | unlock_new_inode(inode); | |
553 | return inode; | |
554 | } | |
555 | ||
263d90ce RK |
556 | struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, |
557 | __u64 cno) | |
558 | { | |
4d8d9293 RK |
559 | struct nilfs_iget_args args = { |
560 | .ino = ino, .root = NULL, .cno = cno, .for_gc = 1 | |
561 | }; | |
263d90ce RK |
562 | struct inode *inode; |
563 | int err; | |
564 | ||
565 | inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); | |
566 | if (unlikely(!inode)) | |
567 | return ERR_PTR(-ENOMEM); | |
568 | if (!(inode->i_state & I_NEW)) | |
569 | return inode; | |
570 | ||
571 | err = nilfs_init_gcinode(inode); | |
572 | if (unlikely(err)) { | |
573 | iget_failed(inode); | |
574 | return ERR_PTR(err); | |
575 | } | |
576 | unlock_new_inode(inode); | |
577 | return inode; | |
578 | } | |
579 | ||
05fe58fd RK |
580 | void nilfs_write_inode_common(struct inode *inode, |
581 | struct nilfs_inode *raw_inode, int has_bmap) | |
582 | { | |
583 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
584 | ||
585 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
586 | raw_inode->i_uid = cpu_to_le32(inode->i_uid); | |
587 | raw_inode->i_gid = cpu_to_le32(inode->i_gid); | |
588 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
589 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
590 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
591 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
592 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
593 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
594 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
595 | ||
05fe58fd RK |
596 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
597 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
598 | ||
599 | if (has_bmap) | |
600 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
601 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
602 | raw_inode->i_device_code = | |
cdce214e | 603 | cpu_to_le64(huge_encode_dev(inode->i_rdev)); |
05fe58fd RK |
604 | /* When extending inode, nilfs->ns_inode_size should be checked |
605 | for substitutions of appended fields */ | |
606 | } | |
607 | ||
608 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
609 | { | |
610 | ino_t ino = inode->i_ino; | |
611 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e912a5b6 | 612 | struct inode *ifile = ii->i_root->ifile; |
05fe58fd RK |
613 | struct nilfs_inode *raw_inode; |
614 | ||
e912a5b6 | 615 | raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh); |
05fe58fd | 616 | |
05fe58fd | 617 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) |
e912a5b6 | 618 | memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size); |
05fe58fd RK |
619 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); |
620 | ||
621 | nilfs_write_inode_common(inode, raw_inode, 0); | |
622 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
623 | deadlock of bmap. This delays update of i_bmap to just | |
624 | before writing */ | |
e912a5b6 | 625 | nilfs_ifile_unmap_inode(ifile, ino, ibh); |
05fe58fd RK |
626 | } |
627 | ||
628 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
629 | ||
630 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
631 | unsigned long from) | |
632 | { | |
633 | unsigned long b; | |
634 | int ret; | |
635 | ||
636 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
637 | return; | |
e828949e | 638 | repeat: |
05fe58fd RK |
639 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); |
640 | if (ret == -ENOENT) | |
641 | return; | |
642 | else if (ret < 0) | |
643 | goto failed; | |
644 | ||
645 | if (b < from) | |
646 | return; | |
647 | ||
648 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
649 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
650 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
651 | if (!ret || (ret == -ENOMEM && | |
652 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
653 | goto repeat; | |
654 | ||
e828949e RK |
655 | failed: |
656 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
657 | "failed to truncate bmap (ino=%lu, err=%d)", | |
658 | ii->vfs_inode.i_ino, ret); | |
05fe58fd RK |
659 | } |
660 | ||
661 | void nilfs_truncate(struct inode *inode) | |
662 | { | |
663 | unsigned long blkoff; | |
664 | unsigned int blocksize; | |
665 | struct nilfs_transaction_info ti; | |
666 | struct super_block *sb = inode->i_sb; | |
667 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
668 | |
669 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
670 | return; | |
671 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
672 | return; | |
673 | ||
674 | blocksize = sb->s_blocksize; | |
675 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
1f5abe7e | 676 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
05fe58fd RK |
677 | |
678 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
679 | ||
680 | nilfs_truncate_bmap(ii, blkoff); | |
681 | ||
682 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
683 | if (IS_SYNC(inode)) | |
684 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
685 | ||
abdb318b | 686 | nilfs_mark_inode_dirty(inode); |
bcbc8c64 | 687 | nilfs_set_file_dirty(inode, 0); |
47420c79 | 688 | nilfs_transaction_commit(sb); |
05fe58fd RK |
689 | /* May construct a logical segment and may fail in sync mode. |
690 | But truncate has no return value. */ | |
691 | } | |
692 | ||
6fd1e5c9 AV |
693 | static void nilfs_clear_inode(struct inode *inode) |
694 | { | |
695 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
518d1a6a | 696 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
6fd1e5c9 AV |
697 | |
698 | /* | |
699 | * Free resources allocated in nilfs_read_inode(), here. | |
700 | */ | |
701 | BUG_ON(!list_empty(&ii->i_dirty)); | |
702 | brelse(ii->i_bh); | |
703 | ii->i_bh = NULL; | |
704 | ||
518d1a6a RK |
705 | if (mdi && mdi->mi_palloc_cache) |
706 | nilfs_palloc_destroy_cache(inode); | |
707 | ||
6fd1e5c9 AV |
708 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) |
709 | nilfs_bmap_clear(ii->i_bmap); | |
710 | ||
711 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
4d8d9293 RK |
712 | |
713 | if (ii->i_root && inode->i_ino == NILFS_ROOT_INO) | |
714 | nilfs_put_root(ii->i_root); | |
6fd1e5c9 AV |
715 | } |
716 | ||
717 | void nilfs_evict_inode(struct inode *inode) | |
05fe58fd RK |
718 | { |
719 | struct nilfs_transaction_info ti; | |
720 | struct super_block *sb = inode->i_sb; | |
721 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
25b18d39 | 722 | int ret; |
05fe58fd | 723 | |
4d8d9293 | 724 | if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) { |
05fe58fd RK |
725 | if (inode->i_data.nrpages) |
726 | truncate_inode_pages(&inode->i_data, 0); | |
6fd1e5c9 AV |
727 | end_writeback(inode); |
728 | nilfs_clear_inode(inode); | |
05fe58fd RK |
729 | return; |
730 | } | |
1f5abe7e RK |
731 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
732 | ||
05fe58fd RK |
733 | if (inode->i_data.nrpages) |
734 | truncate_inode_pages(&inode->i_data, 0); | |
735 | ||
e912a5b6 | 736 | /* TODO: some of the following operations may fail. */ |
05fe58fd | 737 | nilfs_truncate_bmap(ii, 0); |
abdb318b | 738 | nilfs_mark_inode_dirty(inode); |
6fd1e5c9 | 739 | end_writeback(inode); |
e912a5b6 | 740 | |
25b18d39 RK |
741 | ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino); |
742 | if (!ret) | |
743 | atomic_dec(&ii->i_root->inodes_count); | |
e912a5b6 | 744 | |
6fd1e5c9 | 745 | nilfs_clear_inode(inode); |
e912a5b6 | 746 | |
05fe58fd RK |
747 | if (IS_SYNC(inode)) |
748 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 749 | nilfs_transaction_commit(sb); |
05fe58fd RK |
750 | /* May construct a logical segment and may fail in sync mode. |
751 | But delete_inode has no return value. */ | |
752 | } | |
753 | ||
754 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
755 | { | |
756 | struct nilfs_transaction_info ti; | |
757 | struct inode *inode = dentry->d_inode; | |
758 | struct super_block *sb = inode->i_sb; | |
47420c79 | 759 | int err; |
05fe58fd RK |
760 | |
761 | err = inode_change_ok(inode, iattr); | |
762 | if (err) | |
763 | return err; | |
764 | ||
765 | err = nilfs_transaction_begin(sb, &ti, 0); | |
766 | if (unlikely(err)) | |
767 | return err; | |
1025774c CH |
768 | |
769 | if ((iattr->ia_valid & ATTR_SIZE) && | |
770 | iattr->ia_size != i_size_read(inode)) { | |
771 | err = vmtruncate(inode, iattr->ia_size); | |
772 | if (unlikely(err)) | |
773 | goto out_err; | |
774 | } | |
775 | ||
776 | setattr_copy(inode, iattr); | |
777 | mark_inode_dirty(inode); | |
778 | ||
779 | if (iattr->ia_valid & ATTR_MODE) { | |
05fe58fd | 780 | err = nilfs_acl_chmod(inode); |
1025774c CH |
781 | if (unlikely(err)) |
782 | goto out_err; | |
783 | } | |
784 | ||
785 | return nilfs_transaction_commit(sb); | |
47420c79 | 786 | |
1025774c CH |
787 | out_err: |
788 | nilfs_transaction_abort(sb); | |
47420c79 | 789 | return err; |
05fe58fd RK |
790 | } |
791 | ||
b74c79e9 | 792 | int nilfs_permission(struct inode *inode, int mask, unsigned int flags) |
dc3d3b81 | 793 | { |
b74c79e9 NP |
794 | struct nilfs_root *root; |
795 | ||
796 | if (flags & IPERM_FLAG_RCU) | |
797 | return -ECHILD; | |
dc3d3b81 | 798 | |
b74c79e9 | 799 | root = NILFS_I(inode)->i_root; |
dc3d3b81 RK |
800 | if ((mask & MAY_WRITE) && root && |
801 | root->cno != NILFS_CPTREE_CURRENT_CNO) | |
802 | return -EROFS; /* snapshot is not writable */ | |
803 | ||
b74c79e9 | 804 | return generic_permission(inode, mask, flags, NULL); |
dc3d3b81 RK |
805 | } |
806 | ||
bcbc8c64 | 807 | int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh) |
05fe58fd | 808 | { |
e3154e97 | 809 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd RK |
810 | struct nilfs_inode_info *ii = NILFS_I(inode); |
811 | int err; | |
812 | ||
693dd321 | 813 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd | 814 | if (ii->i_bh == NULL) { |
693dd321 | 815 | spin_unlock(&nilfs->ns_inode_lock); |
e912a5b6 RK |
816 | err = nilfs_ifile_get_inode_block(ii->i_root->ifile, |
817 | inode->i_ino, pbh); | |
05fe58fd RK |
818 | if (unlikely(err)) |
819 | return err; | |
693dd321 | 820 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
821 | if (ii->i_bh == NULL) |
822 | ii->i_bh = *pbh; | |
823 | else { | |
824 | brelse(*pbh); | |
825 | *pbh = ii->i_bh; | |
826 | } | |
827 | } else | |
828 | *pbh = ii->i_bh; | |
829 | ||
830 | get_bh(*pbh); | |
693dd321 | 831 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
832 | return 0; |
833 | } | |
834 | ||
835 | int nilfs_inode_dirty(struct inode *inode) | |
836 | { | |
837 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e3154e97 | 838 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd RK |
839 | int ret = 0; |
840 | ||
841 | if (!list_empty(&ii->i_dirty)) { | |
693dd321 | 842 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
843 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || |
844 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
693dd321 | 845 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
846 | } |
847 | return ret; | |
848 | } | |
849 | ||
bcbc8c64 | 850 | int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty) |
05fe58fd RK |
851 | { |
852 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
e3154e97 | 853 | struct the_nilfs *nilfs = inode->i_sb->s_fs_info; |
05fe58fd | 854 | |
693dd321 | 855 | atomic_add(nr_dirty, &nilfs->ns_ndirtyblks); |
05fe58fd | 856 | |
458c5b08 | 857 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
858 | return 0; |
859 | ||
693dd321 | 860 | spin_lock(&nilfs->ns_inode_lock); |
05fe58fd RK |
861 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && |
862 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
863 | /* Because this routine may race with nilfs_dispose_list(), | |
864 | we have to check NILFS_I_QUEUED here, too. */ | |
865 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
866 | /* This will happen when somebody is freeing | |
867 | this inode. */ | |
693dd321 | 868 | nilfs_warning(inode->i_sb, __func__, |
05fe58fd RK |
869 | "cannot get inode (ino=%lu)\n", |
870 | inode->i_ino); | |
693dd321 | 871 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
872 | return -EINVAL; /* NILFS_I_DIRTY may remain for |
873 | freeing inode */ | |
874 | } | |
875 | list_del(&ii->i_dirty); | |
693dd321 | 876 | list_add_tail(&ii->i_dirty, &nilfs->ns_dirty_files); |
05fe58fd RK |
877 | set_bit(NILFS_I_QUEUED, &ii->i_state); |
878 | } | |
693dd321 | 879 | spin_unlock(&nilfs->ns_inode_lock); |
05fe58fd RK |
880 | return 0; |
881 | } | |
882 | ||
883 | int nilfs_mark_inode_dirty(struct inode *inode) | |
884 | { | |
05fe58fd RK |
885 | struct buffer_head *ibh; |
886 | int err; | |
887 | ||
bcbc8c64 | 888 | err = nilfs_load_inode_block(inode, &ibh); |
05fe58fd RK |
889 | if (unlikely(err)) { |
890 | nilfs_warning(inode->i_sb, __func__, | |
891 | "failed to reget inode block.\n"); | |
892 | return err; | |
893 | } | |
05fe58fd | 894 | nilfs_update_inode(inode, ibh); |
05fe58fd | 895 | nilfs_mdt_mark_buffer_dirty(ibh); |
e912a5b6 | 896 | nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile); |
05fe58fd RK |
897 | brelse(ibh); |
898 | return 0; | |
899 | } | |
900 | ||
901 | /** | |
902 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
903 | * @inode: inode of the file to be registered. | |
904 | * | |
905 | * nilfs_dirty_inode() loads a inode block containing the specified | |
906 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
907 | * entry in the inode block. This operation is excluded from the segment | |
908 | * construction. This function can be called both as a single operation | |
909 | * and as a part of indivisible file operations. | |
910 | */ | |
911 | void nilfs_dirty_inode(struct inode *inode) | |
912 | { | |
913 | struct nilfs_transaction_info ti; | |
7d6cd92f | 914 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
05fe58fd RK |
915 | |
916 | if (is_bad_inode(inode)) { | |
917 | nilfs_warning(inode->i_sb, __func__, | |
918 | "tried to mark bad_inode dirty. ignored.\n"); | |
919 | dump_stack(); | |
920 | return; | |
921 | } | |
7d6cd92f RK |
922 | if (mdi) { |
923 | nilfs_mdt_mark_dirty(inode); | |
924 | return; | |
925 | } | |
05fe58fd | 926 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
458c5b08 | 927 | nilfs_mark_inode_dirty(inode); |
47420c79 | 928 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 929 | } |
622daaff RK |
930 | |
931 | int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, | |
932 | __u64 start, __u64 len) | |
933 | { | |
934 | struct the_nilfs *nilfs = NILFS_I_NILFS(inode); | |
935 | __u64 logical = 0, phys = 0, size = 0; | |
936 | __u32 flags = 0; | |
937 | loff_t isize; | |
938 | sector_t blkoff, end_blkoff; | |
939 | sector_t delalloc_blkoff; | |
940 | unsigned long delalloc_blklen; | |
941 | unsigned int blkbits = inode->i_blkbits; | |
942 | int ret, n; | |
943 | ||
944 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
945 | if (ret) | |
946 | return ret; | |
947 | ||
948 | mutex_lock(&inode->i_mutex); | |
949 | ||
950 | isize = i_size_read(inode); | |
951 | ||
952 | blkoff = start >> blkbits; | |
953 | end_blkoff = (start + len - 1) >> blkbits; | |
954 | ||
955 | delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff, | |
956 | &delalloc_blkoff); | |
957 | ||
958 | do { | |
959 | __u64 blkphy; | |
960 | unsigned int maxblocks; | |
961 | ||
962 | if (delalloc_blklen && blkoff == delalloc_blkoff) { | |
963 | if (size) { | |
964 | /* End of the current extent */ | |
965 | ret = fiemap_fill_next_extent( | |
966 | fieinfo, logical, phys, size, flags); | |
967 | if (ret) | |
968 | break; | |
969 | } | |
970 | if (blkoff > end_blkoff) | |
971 | break; | |
972 | ||
973 | flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC; | |
974 | logical = blkoff << blkbits; | |
975 | phys = 0; | |
976 | size = delalloc_blklen << blkbits; | |
977 | ||
978 | blkoff = delalloc_blkoff + delalloc_blklen; | |
979 | delalloc_blklen = nilfs_find_uncommitted_extent( | |
980 | inode, blkoff, &delalloc_blkoff); | |
981 | continue; | |
982 | } | |
983 | ||
984 | /* | |
985 | * Limit the number of blocks that we look up so as | |
986 | * not to get into the next delayed allocation extent. | |
987 | */ | |
988 | maxblocks = INT_MAX; | |
989 | if (delalloc_blklen) | |
990 | maxblocks = min_t(sector_t, delalloc_blkoff - blkoff, | |
991 | maxblocks); | |
992 | blkphy = 0; | |
993 | ||
994 | down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); | |
995 | n = nilfs_bmap_lookup_contig( | |
996 | NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks); | |
997 | up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); | |
998 | ||
999 | if (n < 0) { | |
1000 | int past_eof; | |
1001 | ||
1002 | if (unlikely(n != -ENOENT)) | |
1003 | break; /* error */ | |
1004 | ||
1005 | /* HOLE */ | |
1006 | blkoff++; | |
1007 | past_eof = ((blkoff << blkbits) >= isize); | |
1008 | ||
1009 | if (size) { | |
1010 | /* End of the current extent */ | |
1011 | ||
1012 | if (past_eof) | |
1013 | flags |= FIEMAP_EXTENT_LAST; | |
1014 | ||
1015 | ret = fiemap_fill_next_extent( | |
1016 | fieinfo, logical, phys, size, flags); | |
1017 | if (ret) | |
1018 | break; | |
1019 | size = 0; | |
1020 | } | |
1021 | if (blkoff > end_blkoff || past_eof) | |
1022 | break; | |
1023 | } else { | |
1024 | if (size) { | |
1025 | if (phys && blkphy << blkbits == phys + size) { | |
1026 | /* The current extent goes on */ | |
1027 | size += n << blkbits; | |
1028 | } else { | |
1029 | /* Terminate the current extent */ | |
1030 | ret = fiemap_fill_next_extent( | |
1031 | fieinfo, logical, phys, size, | |
1032 | flags); | |
1033 | if (ret || blkoff > end_blkoff) | |
1034 | break; | |
1035 | ||
1036 | /* Start another extent */ | |
1037 | flags = FIEMAP_EXTENT_MERGED; | |
1038 | logical = blkoff << blkbits; | |
1039 | phys = blkphy << blkbits; | |
1040 | size = n << blkbits; | |
1041 | } | |
1042 | } else { | |
1043 | /* Start a new extent */ | |
1044 | flags = FIEMAP_EXTENT_MERGED; | |
1045 | logical = blkoff << blkbits; | |
1046 | phys = blkphy << blkbits; | |
1047 | size = n << blkbits; | |
1048 | } | |
1049 | blkoff += n; | |
1050 | } | |
1051 | cond_resched(); | |
1052 | } while (true); | |
1053 | ||
1054 | /* If ret is 1 then we just hit the end of the extent array */ | |
1055 | if (ret == 1) | |
1056 | ret = 0; | |
1057 | ||
1058 | mutex_unlock(&inode->i_mutex); | |
1059 | return ret; | |
1060 | } |