Commit | Line | Data |
---|---|---|
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> | |
25 | #include <linux/mpage.h> | |
26 | #include <linux/writeback.h> | |
f30bf3e4 | 27 | #include <linux/uio.h> |
05fe58fd RK |
28 | #include "nilfs.h" |
29 | #include "segment.h" | |
30 | #include "page.h" | |
31 | #include "mdt.h" | |
32 | #include "cpfile.h" | |
33 | #include "ifile.h" | |
34 | ||
35 | ||
36 | /** | |
37 | * nilfs_get_block() - get a file block on the filesystem (callback function) | |
38 | * @inode - inode struct of the target file | |
39 | * @blkoff - file block number | |
40 | * @bh_result - buffer head to be mapped on | |
41 | * @create - indicate whether allocating the block or not when it has not | |
42 | * been allocated yet. | |
43 | * | |
44 | * This function does not issue actual read request of the specified data | |
45 | * block. It is done by VFS. | |
46 | * Bulk read for direct-io is not supported yet. (should be supported) | |
47 | */ | |
48 | int nilfs_get_block(struct inode *inode, sector_t blkoff, | |
49 | struct buffer_head *bh_result, int create) | |
50 | { | |
51 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
52 | unsigned long blknum = 0; | |
53 | int err = 0, ret; | |
54 | struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode)); | |
55 | ||
56 | /* This exclusion control is a workaround; should be revised */ | |
57 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
58 | ret = nilfs_bmap_lookup(ii->i_bmap, (unsigned long)blkoff, &blknum); | |
59 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
60 | if (ret == 0) { /* found */ | |
61 | map_bh(bh_result, inode->i_sb, blknum); | |
62 | goto out; | |
63 | } | |
64 | if (unlikely(ret == 1)) { | |
65 | printk(KERN_ERR "nilfs_get_block: bmap_lookup returns " | |
66 | "buffer_head pointer (blkoff=%llu, blknum=%lu)\n", | |
67 | (unsigned long long)blkoff, blknum); | |
68 | BUG(); | |
69 | } | |
70 | /* data block was not found */ | |
71 | if (ret == -ENOENT && create) { | |
72 | struct nilfs_transaction_info ti; | |
73 | ||
74 | bh_result->b_blocknr = 0; | |
75 | err = nilfs_transaction_begin(inode->i_sb, &ti, 1); | |
76 | if (unlikely(err)) | |
77 | goto out; | |
78 | err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff, | |
79 | (unsigned long)bh_result); | |
80 | nilfs_transaction_end(inode->i_sb, !err); | |
81 | if (unlikely(err != 0)) { | |
82 | if (err == -EEXIST) { | |
83 | /* | |
84 | * The get_block() function could be called | |
85 | * from multiple callers for an inode. | |
86 | * However, the page having this block must | |
87 | * be locked in this case. | |
88 | */ | |
89 | printk(KERN_ERR | |
90 | "nilfs_get_block: a race condition " | |
91 | "while inserting a data block. " | |
92 | "(inode number=%lu, file block " | |
93 | "offset=%llu)\n", | |
94 | inode->i_ino, | |
95 | (unsigned long long)blkoff); | |
96 | BUG(); | |
97 | } else if (err == -EINVAL) { | |
98 | nilfs_error(inode->i_sb, __func__, | |
99 | "broken bmap (inode=%lu)\n", | |
100 | inode->i_ino); | |
101 | err = -EIO; | |
102 | } | |
103 | goto out; | |
104 | } | |
105 | /* Error handling should be detailed */ | |
106 | set_buffer_new(bh_result); | |
107 | map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed | |
108 | to proper value */ | |
109 | } else if (ret == -ENOENT) { | |
110 | /* not found is not error (e.g. hole); must return without | |
111 | the mapped state flag. */ | |
112 | ; | |
113 | } else { | |
114 | err = ret; | |
115 | } | |
116 | ||
117 | out: | |
118 | return err; | |
119 | } | |
120 | ||
121 | /** | |
122 | * nilfs_readpage() - implement readpage() method of nilfs_aops {} | |
123 | * address_space_operations. | |
124 | * @file - file struct of the file to be read | |
125 | * @page - the page to be read | |
126 | */ | |
127 | static int nilfs_readpage(struct file *file, struct page *page) | |
128 | { | |
129 | return mpage_readpage(page, nilfs_get_block); | |
130 | } | |
131 | ||
132 | /** | |
133 | * nilfs_readpages() - implement readpages() method of nilfs_aops {} | |
134 | * address_space_operations. | |
135 | * @file - file struct of the file to be read | |
136 | * @mapping - address_space struct used for reading multiple pages | |
137 | * @pages - the pages to be read | |
138 | * @nr_pages - number of pages to be read | |
139 | */ | |
140 | static int nilfs_readpages(struct file *file, struct address_space *mapping, | |
141 | struct list_head *pages, unsigned nr_pages) | |
142 | { | |
143 | return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); | |
144 | } | |
145 | ||
146 | static int nilfs_writepages(struct address_space *mapping, | |
147 | struct writeback_control *wbc) | |
148 | { | |
f30bf3e4 RK |
149 | struct inode *inode = mapping->host; |
150 | int err = 0; | |
151 | ||
152 | if (wbc->sync_mode == WB_SYNC_ALL) | |
153 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, | |
154 | wbc->range_start, | |
155 | wbc->range_end); | |
156 | return err; | |
05fe58fd RK |
157 | } |
158 | ||
159 | static int nilfs_writepage(struct page *page, struct writeback_control *wbc) | |
160 | { | |
161 | struct inode *inode = page->mapping->host; | |
162 | int err; | |
163 | ||
164 | redirty_page_for_writepage(wbc, page); | |
165 | unlock_page(page); | |
166 | ||
167 | if (wbc->sync_mode == WB_SYNC_ALL) { | |
168 | err = nilfs_construct_segment(inode->i_sb); | |
169 | if (unlikely(err)) | |
170 | return err; | |
171 | } else if (wbc->for_reclaim) | |
172 | nilfs_flush_segment(inode->i_sb, inode->i_ino); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static int nilfs_set_page_dirty(struct page *page) | |
178 | { | |
179 | int ret = __set_page_dirty_buffers(page); | |
180 | ||
181 | if (ret) { | |
182 | struct inode *inode = page->mapping->host; | |
183 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
184 | unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); | |
185 | ||
186 | nilfs_set_file_dirty(sbi, inode, nr_dirty); | |
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 | ||
202 | *pagep = NULL; | |
203 | err = block_write_begin(file, mapping, pos, len, flags, pagep, | |
204 | fsdata, nilfs_get_block); | |
205 | if (unlikely(err)) | |
206 | nilfs_transaction_end(inode->i_sb, 0); | |
207 | return err; | |
208 | } | |
209 | ||
210 | static int nilfs_write_end(struct file *file, struct address_space *mapping, | |
211 | loff_t pos, unsigned len, unsigned copied, | |
212 | struct page *page, void *fsdata) | |
213 | { | |
214 | struct inode *inode = mapping->host; | |
215 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
216 | unsigned nr_dirty; | |
217 | int err; | |
218 | ||
219 | nr_dirty = nilfs_page_count_clean_buffers(page, start, | |
220 | start + copied); | |
221 | copied = generic_write_end(file, mapping, pos, len, copied, page, | |
222 | fsdata); | |
223 | nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty); | |
224 | err = nilfs_transaction_end(inode->i_sb, 1); | |
225 | return err ? : copied; | |
226 | } | |
227 | ||
228 | static ssize_t | |
229 | nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, | |
230 | loff_t offset, unsigned long nr_segs) | |
231 | { | |
232 | struct file *file = iocb->ki_filp; | |
233 | struct inode *inode = file->f_mapping->host; | |
234 | ssize_t size; | |
05fe58fd RK |
235 | |
236 | if (rw == WRITE) | |
237 | return 0; | |
238 | ||
239 | /* Needs synchronization with the cleaner */ | |
240 | size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
241 | offset, nr_segs, nilfs_get_block, NULL); | |
242 | return size; | |
243 | } | |
244 | ||
245 | struct address_space_operations nilfs_aops = { | |
246 | .writepage = nilfs_writepage, | |
247 | .readpage = nilfs_readpage, | |
248 | /* .sync_page = nilfs_sync_page, */ | |
249 | .writepages = nilfs_writepages, | |
250 | .set_page_dirty = nilfs_set_page_dirty, | |
251 | .readpages = nilfs_readpages, | |
252 | .write_begin = nilfs_write_begin, | |
253 | .write_end = nilfs_write_end, | |
254 | /* .releasepage = nilfs_releasepage, */ | |
255 | .invalidatepage = block_invalidatepage, | |
256 | .direct_IO = nilfs_direct_IO, | |
257 | }; | |
258 | ||
259 | struct inode *nilfs_new_inode(struct inode *dir, int mode) | |
260 | { | |
261 | struct super_block *sb = dir->i_sb; | |
262 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
263 | struct inode *inode; | |
264 | struct nilfs_inode_info *ii; | |
265 | int err = -ENOMEM; | |
266 | ino_t ino; | |
267 | ||
268 | inode = new_inode(sb); | |
269 | if (unlikely(!inode)) | |
270 | goto failed; | |
271 | ||
272 | mapping_set_gfp_mask(inode->i_mapping, | |
273 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
274 | ||
275 | ii = NILFS_I(inode); | |
276 | ii->i_state = 1 << NILFS_I_NEW; | |
277 | ||
278 | err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh); | |
279 | if (unlikely(err)) | |
280 | goto failed_ifile_create_inode; | |
281 | /* reference count of i_bh inherits from nilfs_mdt_read_block() */ | |
282 | ||
283 | atomic_inc(&sbi->s_inodes_count); | |
284 | ||
285 | inode->i_uid = current_fsuid(); | |
286 | if (dir->i_mode & S_ISGID) { | |
287 | inode->i_gid = dir->i_gid; | |
288 | if (S_ISDIR(mode)) | |
289 | mode |= S_ISGID; | |
290 | } else | |
291 | inode->i_gid = current_fsgid(); | |
292 | ||
293 | inode->i_mode = mode; | |
294 | inode->i_ino = ino; | |
295 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
296 | ||
297 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { | |
298 | err = nilfs_bmap_read(ii->i_bmap, NULL); | |
299 | if (err < 0) | |
300 | goto failed_bmap; | |
301 | ||
302 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
303 | /* No lock is needed; iget() ensures it. */ | |
304 | } | |
305 | ||
306 | ii->i_flags = NILFS_I(dir)->i_flags; | |
307 | if (S_ISLNK(mode)) | |
308 | ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL); | |
309 | if (!S_ISDIR(mode)) | |
310 | ii->i_flags &= ~NILFS_DIRSYNC_FL; | |
311 | ||
312 | /* ii->i_file_acl = 0; */ | |
313 | /* ii->i_dir_acl = 0; */ | |
314 | ii->i_dtime = 0; | |
315 | ii->i_dir_start_lookup = 0; | |
316 | #ifdef CONFIG_NILFS_FS_POSIX_ACL | |
317 | ii->i_acl = NULL; | |
318 | ii->i_default_acl = NULL; | |
319 | #endif | |
320 | ii->i_cno = 0; | |
321 | nilfs_set_inode_flags(inode); | |
322 | spin_lock(&sbi->s_next_gen_lock); | |
323 | inode->i_generation = sbi->s_next_generation++; | |
324 | spin_unlock(&sbi->s_next_gen_lock); | |
325 | insert_inode_hash(inode); | |
326 | ||
327 | err = nilfs_init_acl(inode, dir); | |
328 | if (unlikely(err)) | |
329 | goto failed_acl; /* never occur. When supporting | |
330 | nilfs_init_acl(), proper cancellation of | |
331 | above jobs should be considered */ | |
332 | ||
333 | mark_inode_dirty(inode); | |
334 | return inode; | |
335 | ||
336 | failed_acl: | |
337 | failed_bmap: | |
338 | inode->i_nlink = 0; | |
339 | iput(inode); /* raw_inode will be deleted through | |
340 | generic_delete_inode() */ | |
341 | goto failed; | |
342 | ||
343 | failed_ifile_create_inode: | |
344 | make_bad_inode(inode); | |
345 | iput(inode); /* if i_nlink == 1, generic_forget_inode() will be | |
346 | called */ | |
347 | failed: | |
348 | return ERR_PTR(err); | |
349 | } | |
350 | ||
351 | void nilfs_free_inode(struct inode *inode) | |
352 | { | |
353 | struct super_block *sb = inode->i_sb; | |
354 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
355 | ||
356 | clear_inode(inode); | |
357 | /* XXX: check error code? Is there any thing I can do? */ | |
358 | (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino); | |
359 | atomic_dec(&sbi->s_inodes_count); | |
360 | } | |
361 | ||
362 | void nilfs_set_inode_flags(struct inode *inode) | |
363 | { | |
364 | unsigned int flags = NILFS_I(inode)->i_flags; | |
365 | ||
366 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | | |
367 | S_DIRSYNC); | |
368 | if (flags & NILFS_SYNC_FL) | |
369 | inode->i_flags |= S_SYNC; | |
370 | if (flags & NILFS_APPEND_FL) | |
371 | inode->i_flags |= S_APPEND; | |
372 | if (flags & NILFS_IMMUTABLE_FL) | |
373 | inode->i_flags |= S_IMMUTABLE; | |
374 | #ifndef NILFS_ATIME_DISABLE | |
375 | if (flags & NILFS_NOATIME_FL) | |
376 | #endif | |
377 | inode->i_flags |= S_NOATIME; | |
378 | if (flags & NILFS_DIRSYNC_FL) | |
379 | inode->i_flags |= S_DIRSYNC; | |
380 | mapping_set_gfp_mask(inode->i_mapping, | |
381 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
382 | } | |
383 | ||
384 | int nilfs_read_inode_common(struct inode *inode, | |
385 | struct nilfs_inode *raw_inode) | |
386 | { | |
387 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
388 | int err; | |
389 | ||
390 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
391 | inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid); | |
392 | inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid); | |
393 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
394 | inode->i_size = le64_to_cpu(raw_inode->i_size); | |
395 | inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
396 | inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); | |
397 | inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
398 | inode->i_atime.tv_nsec = 0; | |
399 | inode->i_ctime.tv_nsec = 0; | |
400 | inode->i_mtime.tv_nsec = 0; | |
401 | ii->i_dtime = le64_to_cpu(raw_inode->i_dtime); | |
402 | if (inode->i_nlink == 0 && (inode->i_mode == 0 || ii->i_dtime)) | |
403 | return -EINVAL; /* this inode is deleted */ | |
404 | ||
405 | inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); | |
406 | ii->i_flags = le32_to_cpu(raw_inode->i_flags); | |
407 | #if 0 | |
408 | ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
409 | ii->i_dir_acl = S_ISREG(inode->i_mode) ? | |
410 | 0 : le32_to_cpu(raw_inode->i_dir_acl); | |
411 | #endif | |
412 | ii->i_cno = 0; | |
413 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); | |
414 | ||
415 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
416 | S_ISLNK(inode->i_mode)) { | |
417 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
418 | if (err < 0) | |
419 | return err; | |
420 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
421 | /* No lock is needed; iget() ensures it. */ | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static int nilfs_read_sketch_inode(struct inode *inode) | |
427 | { | |
428 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
429 | int err = 0; | |
430 | ||
431 | if (sbi->s_snapshot_cno) { | |
432 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
433 | struct buffer_head *bh_cp; | |
434 | struct nilfs_checkpoint *raw_cp; | |
435 | ||
436 | err = nilfs_cpfile_get_checkpoint( | |
437 | nilfs->ns_cpfile, sbi->s_snapshot_cno, 0, &raw_cp, | |
438 | &bh_cp); | |
439 | if (likely(!err)) { | |
440 | if (!nilfs_checkpoint_sketch(raw_cp)) | |
441 | inode->i_size = 0; | |
442 | nilfs_cpfile_put_checkpoint( | |
443 | nilfs->ns_cpfile, sbi->s_snapshot_cno, bh_cp); | |
444 | } | |
445 | inode->i_flags |= S_NOCMTIME; | |
446 | } | |
447 | return err; | |
448 | } | |
449 | ||
450 | static int __nilfs_read_inode(struct super_block *sb, unsigned long ino, | |
451 | struct inode *inode) | |
452 | { | |
453 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
454 | struct inode *dat = nilfs_dat_inode(sbi->s_nilfs); | |
455 | struct buffer_head *bh; | |
456 | struct nilfs_inode *raw_inode; | |
457 | int err; | |
458 | ||
459 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
460 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh); | |
461 | if (unlikely(err)) | |
462 | goto bad_inode; | |
463 | ||
464 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh); | |
465 | ||
466 | #ifdef CONFIG_NILFS_FS_POSIX_ACL | |
467 | ii->i_acl = NILFS_ACL_NOT_CACHED; | |
468 | ii->i_default_acl = NILFS_ACL_NOT_CACHED; | |
469 | #endif | |
470 | if (nilfs_read_inode_common(inode, raw_inode)) | |
471 | goto failed_unmap; | |
472 | ||
473 | if (S_ISREG(inode->i_mode)) { | |
474 | inode->i_op = &nilfs_file_inode_operations; | |
475 | inode->i_fop = &nilfs_file_operations; | |
476 | inode->i_mapping->a_ops = &nilfs_aops; | |
477 | if (unlikely(inode->i_ino == NILFS_SKETCH_INO)) { | |
478 | err = nilfs_read_sketch_inode(inode); | |
479 | if (unlikely(err)) | |
480 | goto failed_unmap; | |
481 | } | |
482 | } else if (S_ISDIR(inode->i_mode)) { | |
483 | inode->i_op = &nilfs_dir_inode_operations; | |
484 | inode->i_fop = &nilfs_dir_operations; | |
485 | inode->i_mapping->a_ops = &nilfs_aops; | |
486 | } else if (S_ISLNK(inode->i_mode)) { | |
487 | inode->i_op = &nilfs_symlink_inode_operations; | |
488 | inode->i_mapping->a_ops = &nilfs_aops; | |
489 | } else { | |
490 | inode->i_op = &nilfs_special_inode_operations; | |
491 | init_special_inode( | |
492 | inode, inode->i_mode, | |
493 | new_decode_dev(le64_to_cpu(raw_inode->i_device_code))); | |
494 | } | |
495 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
496 | brelse(bh); | |
497 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
498 | nilfs_set_inode_flags(inode); | |
499 | return 0; | |
500 | ||
501 | failed_unmap: | |
502 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
503 | brelse(bh); | |
504 | ||
505 | bad_inode: | |
506 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
507 | return err; | |
508 | } | |
509 | ||
510 | struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) | |
511 | { | |
512 | struct inode *inode; | |
513 | int err; | |
514 | ||
515 | inode = iget_locked(sb, ino); | |
516 | if (unlikely(!inode)) | |
517 | return ERR_PTR(-ENOMEM); | |
518 | if (!(inode->i_state & I_NEW)) | |
519 | return inode; | |
520 | ||
521 | err = __nilfs_read_inode(sb, ino, inode); | |
522 | if (unlikely(err)) { | |
523 | iget_failed(inode); | |
524 | return ERR_PTR(err); | |
525 | } | |
526 | unlock_new_inode(inode); | |
527 | return inode; | |
528 | } | |
529 | ||
530 | void nilfs_write_inode_common(struct inode *inode, | |
531 | struct nilfs_inode *raw_inode, int has_bmap) | |
532 | { | |
533 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
534 | ||
535 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
536 | raw_inode->i_uid = cpu_to_le32(inode->i_uid); | |
537 | raw_inode->i_gid = cpu_to_le32(inode->i_gid); | |
538 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
539 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
540 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
541 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
542 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); | |
543 | ||
544 | raw_inode->i_dtime = cpu_to_le64(ii->i_dtime); | |
545 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); | |
546 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
547 | ||
548 | if (has_bmap) | |
549 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
550 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
551 | raw_inode->i_device_code = | |
552 | cpu_to_le64(new_encode_dev(inode->i_rdev)); | |
553 | /* When extending inode, nilfs->ns_inode_size should be checked | |
554 | for substitutions of appended fields */ | |
555 | } | |
556 | ||
557 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
558 | { | |
559 | ino_t ino = inode->i_ino; | |
560 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
561 | struct super_block *sb = inode->i_sb; | |
562 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
563 | struct nilfs_inode *raw_inode; | |
564 | ||
565 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh); | |
566 | ||
567 | /* The buffer is guarded with lock_buffer() by the caller */ | |
568 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) | |
569 | memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size); | |
570 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); | |
571 | ||
572 | nilfs_write_inode_common(inode, raw_inode, 0); | |
573 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
574 | deadlock of bmap. This delays update of i_bmap to just | |
575 | before writing */ | |
576 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh); | |
577 | } | |
578 | ||
579 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
580 | ||
581 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
582 | unsigned long from) | |
583 | { | |
584 | unsigned long b; | |
585 | int ret; | |
586 | ||
587 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
588 | return; | |
589 | repeat: | |
590 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); | |
591 | if (ret == -ENOENT) | |
592 | return; | |
593 | else if (ret < 0) | |
594 | goto failed; | |
595 | ||
596 | if (b < from) | |
597 | return; | |
598 | ||
599 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
600 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
601 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
602 | if (!ret || (ret == -ENOMEM && | |
603 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
604 | goto repeat; | |
605 | ||
606 | failed: | |
607 | if (ret == -EINVAL) | |
608 | nilfs_error(ii->vfs_inode.i_sb, __func__, | |
609 | "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino); | |
610 | else | |
611 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
612 | "failed to truncate bmap (ino=%lu, err=%d)", | |
613 | ii->vfs_inode.i_ino, ret); | |
614 | } | |
615 | ||
616 | void nilfs_truncate(struct inode *inode) | |
617 | { | |
618 | unsigned long blkoff; | |
619 | unsigned int blocksize; | |
620 | struct nilfs_transaction_info ti; | |
621 | struct super_block *sb = inode->i_sb; | |
622 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
623 | int ret; | |
624 | ||
625 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
626 | return; | |
627 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
628 | return; | |
629 | ||
630 | blocksize = sb->s_blocksize; | |
631 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
632 | ret = nilfs_transaction_begin(sb, &ti, 0); | |
633 | BUG_ON(ret); | |
634 | ||
635 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
636 | ||
637 | nilfs_truncate_bmap(ii, blkoff); | |
638 | ||
639 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
640 | if (IS_SYNC(inode)) | |
641 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
642 | ||
643 | nilfs_set_file_dirty(NILFS_SB(sb), inode, 0); | |
644 | nilfs_transaction_end(sb, 1); | |
645 | /* May construct a logical segment and may fail in sync mode. | |
646 | But truncate has no return value. */ | |
647 | } | |
648 | ||
649 | void nilfs_delete_inode(struct inode *inode) | |
650 | { | |
651 | struct nilfs_transaction_info ti; | |
652 | struct super_block *sb = inode->i_sb; | |
653 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
654 | int err; | |
655 | ||
656 | if (unlikely(is_bad_inode(inode))) { | |
657 | if (inode->i_data.nrpages) | |
658 | truncate_inode_pages(&inode->i_data, 0); | |
659 | clear_inode(inode); | |
660 | return; | |
661 | } | |
662 | err = nilfs_transaction_begin(sb, &ti, 0); | |
663 | BUG_ON(err); | |
664 | if (inode->i_data.nrpages) | |
665 | truncate_inode_pages(&inode->i_data, 0); | |
666 | ||
667 | nilfs_truncate_bmap(ii, 0); | |
668 | nilfs_free_inode(inode); | |
669 | /* nilfs_free_inode() marks inode buffer dirty */ | |
670 | if (IS_SYNC(inode)) | |
671 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
672 | nilfs_transaction_end(sb, 1); | |
673 | /* May construct a logical segment and may fail in sync mode. | |
674 | But delete_inode has no return value. */ | |
675 | } | |
676 | ||
677 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
678 | { | |
679 | struct nilfs_transaction_info ti; | |
680 | struct inode *inode = dentry->d_inode; | |
681 | struct super_block *sb = inode->i_sb; | |
682 | int err, err2; | |
683 | ||
684 | err = inode_change_ok(inode, iattr); | |
685 | if (err) | |
686 | return err; | |
687 | ||
688 | err = nilfs_transaction_begin(sb, &ti, 0); | |
689 | if (unlikely(err)) | |
690 | return err; | |
691 | err = inode_setattr(inode, iattr); | |
692 | if (!err && (iattr->ia_valid & ATTR_MODE)) | |
693 | err = nilfs_acl_chmod(inode); | |
694 | err2 = nilfs_transaction_end(sb, 1); | |
695 | return err ? : err2; | |
696 | } | |
697 | ||
698 | int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode, | |
699 | struct buffer_head **pbh) | |
700 | { | |
701 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
702 | int err; | |
703 | ||
704 | spin_lock(&sbi->s_inode_lock); | |
705 | /* Caller of this function MUST lock s_inode_lock */ | |
706 | if (ii->i_bh == NULL) { | |
707 | spin_unlock(&sbi->s_inode_lock); | |
708 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino, | |
709 | pbh); | |
710 | if (unlikely(err)) | |
711 | return err; | |
712 | spin_lock(&sbi->s_inode_lock); | |
713 | if (ii->i_bh == NULL) | |
714 | ii->i_bh = *pbh; | |
715 | else { | |
716 | brelse(*pbh); | |
717 | *pbh = ii->i_bh; | |
718 | } | |
719 | } else | |
720 | *pbh = ii->i_bh; | |
721 | ||
722 | get_bh(*pbh); | |
723 | spin_unlock(&sbi->s_inode_lock); | |
724 | return 0; | |
725 | } | |
726 | ||
727 | int nilfs_inode_dirty(struct inode *inode) | |
728 | { | |
729 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
730 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
731 | int ret = 0; | |
732 | ||
733 | if (!list_empty(&ii->i_dirty)) { | |
734 | spin_lock(&sbi->s_inode_lock); | |
735 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || | |
736 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
737 | spin_unlock(&sbi->s_inode_lock); | |
738 | } | |
739 | return ret; | |
740 | } | |
741 | ||
742 | int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode, | |
743 | unsigned nr_dirty) | |
744 | { | |
745 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
746 | ||
747 | atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); | |
748 | ||
749 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state) || | |
750 | unlikely(inode->i_ino == NILFS_SKETCH_INO)) | |
751 | return 0; | |
752 | ||
753 | spin_lock(&sbi->s_inode_lock); | |
754 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && | |
755 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
756 | /* Because this routine may race with nilfs_dispose_list(), | |
757 | we have to check NILFS_I_QUEUED here, too. */ | |
758 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
759 | /* This will happen when somebody is freeing | |
760 | this inode. */ | |
761 | nilfs_warning(sbi->s_super, __func__, | |
762 | "cannot get inode (ino=%lu)\n", | |
763 | inode->i_ino); | |
764 | spin_unlock(&sbi->s_inode_lock); | |
765 | return -EINVAL; /* NILFS_I_DIRTY may remain for | |
766 | freeing inode */ | |
767 | } | |
768 | list_del(&ii->i_dirty); | |
769 | list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); | |
770 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
771 | } | |
772 | spin_unlock(&sbi->s_inode_lock); | |
773 | return 0; | |
774 | } | |
775 | ||
776 | int nilfs_mark_inode_dirty(struct inode *inode) | |
777 | { | |
778 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
779 | struct buffer_head *ibh; | |
780 | int err; | |
781 | ||
782 | err = nilfs_load_inode_block(sbi, inode, &ibh); | |
783 | if (unlikely(err)) { | |
784 | nilfs_warning(inode->i_sb, __func__, | |
785 | "failed to reget inode block.\n"); | |
786 | return err; | |
787 | } | |
788 | lock_buffer(ibh); | |
789 | nilfs_update_inode(inode, ibh); | |
790 | unlock_buffer(ibh); | |
791 | nilfs_mdt_mark_buffer_dirty(ibh); | |
792 | nilfs_mdt_mark_dirty(sbi->s_ifile); | |
793 | brelse(ibh); | |
794 | return 0; | |
795 | } | |
796 | ||
797 | /** | |
798 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
799 | * @inode: inode of the file to be registered. | |
800 | * | |
801 | * nilfs_dirty_inode() loads a inode block containing the specified | |
802 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
803 | * entry in the inode block. This operation is excluded from the segment | |
804 | * construction. This function can be called both as a single operation | |
805 | * and as a part of indivisible file operations. | |
806 | */ | |
807 | void nilfs_dirty_inode(struct inode *inode) | |
808 | { | |
809 | struct nilfs_transaction_info ti; | |
810 | ||
811 | if (is_bad_inode(inode)) { | |
812 | nilfs_warning(inode->i_sb, __func__, | |
813 | "tried to mark bad_inode dirty. ignored.\n"); | |
814 | dump_stack(); | |
815 | return; | |
816 | } | |
817 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
818 | if (likely(inode->i_ino != NILFS_SKETCH_INO)) | |
819 | nilfs_mark_inode_dirty(inode); | |
820 | nilfs_transaction_end(inode->i_sb, 1); /* never fails */ | |
821 | } |