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1/*
2 * fs/logfs/dir.c - directory-related code
3 *
4 * As should be obvious for Linux kernel code, license is GPLv2
5 *
6 * Copyright (c) 2005-2008 Joern Engel <joern@logfs.org>
7 */
8#include "logfs.h"
9#include <linux/slab.h>
10
11/*
12 * Atomic dir operations
13 *
14 * Directory operations are by default not atomic. Dentries and Inodes are
15 * created/removed/altered in separate operations. Therefore we need to do
16 * a small amount of journaling.
17 *
18 * Create, link, mkdir, mknod and symlink all share the same function to do
19 * the work: __logfs_create. This function works in two atomic steps:
20 * 1. allocate inode (remember in journal)
21 * 2. allocate dentry (clear journal)
22 *
23 * As we can only get interrupted between the two, when the inode we just
24 * created is simply stored in the anchor. On next mount, if we were
25 * interrupted, we delete the inode. From a users point of view the
26 * operation never happened.
27 *
28 * Unlink and rmdir also share the same function: unlink. Again, this
29 * function works in two atomic steps
30 * 1. remove dentry (remember inode in journal)
31 * 2. unlink inode (clear journal)
32 *
33 * And again, on the next mount, if we were interrupted, we delete the inode.
34 * From a users point of view the operation succeeded.
35 *
36 * Rename is the real pain to deal with, harder than all the other methods
37 * combined. Depending on the circumstances we can run into three cases.
38 * A "target rename" where the target dentry already existed, a "local
39 * rename" where both parent directories are identical or a "cross-directory
40 * rename" in the remaining case.
41 *
42 * Local rename is atomic, as the old dentry is simply rewritten with a new
43 * name.
44 *
45 * Cross-directory rename works in two steps, similar to __logfs_create and
46 * logfs_unlink:
47 * 1. Write new dentry (remember old dentry in journal)
48 * 2. Remove old dentry (clear journal)
49 *
50 * Here we remember a dentry instead of an inode. On next mount, if we were
51 * interrupted, we delete the dentry. From a users point of view, the
52 * operation succeeded.
53 *
54 * Target rename works in three atomic steps:
55 * 1. Attach old inode to new dentry (remember old dentry and new inode)
56 * 2. Remove old dentry (still remember the new inode)
57 * 3. Remove victim inode
58 *
59 * Here we remember both an inode an a dentry. If we get interrupted
60 * between steps 1 and 2, we delete both the dentry and the inode. If
61 * we get interrupted between steps 2 and 3, we delete just the inode.
62 * In either case, the remaining objects are deleted on next mount. From
63 * a users point of view, the operation succeeded.
64 */
65
66static int write_dir(struct inode *dir, struct logfs_disk_dentry *dd,
67 loff_t pos)
68{
69 return logfs_inode_write(dir, dd, sizeof(*dd), pos, WF_LOCK, NULL);
70}
71
72static int write_inode(struct inode *inode)
73{
74 return __logfs_write_inode(inode, NULL, WF_LOCK);
75}
76
77static s64 dir_seek_data(struct inode *inode, s64 pos)
78{
79 s64 new_pos = logfs_seek_data(inode, pos);
80
81 return max(pos, new_pos - 1);
82}
83
84static int beyond_eof(struct inode *inode, loff_t bix)
85{
86 loff_t pos = bix << inode->i_sb->s_blocksize_bits;
87 return pos >= i_size_read(inode);
88}
89
90/*
91 * Prime value was chosen to be roughly 256 + 26. r5 hash uses 11,
92 * so short names (len <= 9) don't even occupy the complete 32bit name
93 * space. A prime >256 ensures short names quickly spread the 32bit
94 * name space. Add about 26 for the estimated amount of information
95 * of each character and pick a prime nearby, preferably a bit-sparse
96 * one.
97 */
98static u32 hash_32(const char *s, int len, u32 seed)
99{
100 u32 hash = seed;
101 int i;
102
103 for (i = 0; i < len; i++)
104 hash = hash * 293 + s[i];
105 return hash;
106}
107
108/*
109 * We have to satisfy several conflicting requirements here. Small
110 * directories should stay fairly compact and not require too many
111 * indirect blocks. The number of possible locations for a given hash
112 * should be small to make lookup() fast. And we should try hard not
113 * to overflow the 32bit name space or nfs and 32bit host systems will
114 * be unhappy.
115 *
116 * So we use the following scheme. First we reduce the hash to 0..15
117 * and try a direct block. If that is occupied we reduce the hash to
118 * 16..255 and try an indirect block. Same for 2x and 3x indirect
119 * blocks. Lastly we reduce the hash to 0x800_0000 .. 0xffff_ffff,
120 * but use buckets containing eight entries instead of a single one.
121 *
122 * Using 16 entries should allow for a reasonable amount of hash
123 * collisions, so the 32bit name space can be packed fairly tight
124 * before overflowing. Oh and currently we don't overflow but return
125 * and error.
126 *
127 * How likely are collisions? Doing the appropriate math is beyond me
128 * and the Bronstein textbook. But running a test program to brute
129 * force collisions for a couple of days showed that on average the
130 * first collision occurs after 598M entries, with 290M being the
131 * smallest result. Obviously 21 entries could already cause a
132 * collision if all entries are carefully chosen.
133 */
134static pgoff_t hash_index(u32 hash, int round)
135{
136 u32 i0_blocks = I0_BLOCKS;
137 u32 i1_blocks = I1_BLOCKS;
138 u32 i2_blocks = I2_BLOCKS;
139 u32 i3_blocks = I3_BLOCKS;
140
141 switch (round) {
142 case 0:
143 return hash % i0_blocks;
144 case 1:
145 return i0_blocks + hash % (i1_blocks - i0_blocks);
146 case 2:
147 return i1_blocks + hash % (i2_blocks - i1_blocks);
148 case 3:
149 return i2_blocks + hash % (i3_blocks - i2_blocks);
150 case 4 ... 19:
151 return i3_blocks + 16 * (hash % (((1<<31) - i3_blocks) / 16))
152 + round - 4;
153 }
154 BUG();
155}
156
157static struct page *logfs_get_dd_page(struct inode *dir, struct dentry *dentry)
158{
159 struct qstr *name = &dentry->d_name;
160 struct page *page;
161 struct logfs_disk_dentry *dd;
162 u32 hash = hash_32(name->name, name->len, 0);
163 pgoff_t index;
164 int round;
165
166 if (name->len > LOGFS_MAX_NAMELEN)
167 return ERR_PTR(-ENAMETOOLONG);
168
169 for (round = 0; round < 20; round++) {
170 index = hash_index(hash, round);
171
172 if (beyond_eof(dir, index))
173 return NULL;
174 if (!logfs_exist_block(dir, index))
175 continue;
176 page = read_cache_page(dir->i_mapping, index,
177 (filler_t *)logfs_readpage, NULL);
178 if (IS_ERR(page))
179 return page;
180 dd = kmap_atomic(page);
181 BUG_ON(dd->namelen == 0);
182
183 if (name->len != be16_to_cpu(dd->namelen) ||
184 memcmp(name->name, dd->name, name->len)) {
185 kunmap_atomic(dd);
186 put_page(page);
187 continue;
188 }
189
190 kunmap_atomic(dd);
191 return page;
192 }
193 return NULL;
194}
195
196static int logfs_remove_inode(struct inode *inode)
197{
198 int ret;
199
200 drop_nlink(inode);
201 ret = write_inode(inode);
202 LOGFS_BUG_ON(ret, inode->i_sb);
203 return ret;
204}
205
206static void abort_transaction(struct inode *inode, struct logfs_transaction *ta)
207{
208 if (logfs_inode(inode)->li_block)
209 logfs_inode(inode)->li_block->ta = NULL;
210 kfree(ta);
211}
212
213static int logfs_unlink(struct inode *dir, struct dentry *dentry)
214{
215 struct logfs_super *super = logfs_super(dir->i_sb);
216 struct inode *inode = d_inode(dentry);
217 struct logfs_transaction *ta;
218 struct page *page;
219 pgoff_t index;
220 int ret;
221
222 ta = kzalloc(sizeof(*ta), GFP_KERNEL);
223 if (!ta)
224 return -ENOMEM;
225
226 ta->state = UNLINK_1;
227 ta->ino = inode->i_ino;
228
229 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
230
231 page = logfs_get_dd_page(dir, dentry);
232 if (!page) {
233 kfree(ta);
234 return -ENOENT;
235 }
236 if (IS_ERR(page)) {
237 kfree(ta);
238 return PTR_ERR(page);
239 }
240 index = page->index;
241 put_page(page);
242
243 mutex_lock(&super->s_dirop_mutex);
244 logfs_add_transaction(dir, ta);
245
246 ret = logfs_delete(dir, index, NULL);
247 if (!ret)
248 ret = write_inode(dir);
249
250 if (ret) {
251 abort_transaction(dir, ta);
252 printk(KERN_ERR"LOGFS: unable to delete inode\n");
253 goto out;
254 }
255
256 ta->state = UNLINK_2;
257 logfs_add_transaction(inode, ta);
258 ret = logfs_remove_inode(inode);
259out:
260 mutex_unlock(&super->s_dirop_mutex);
261 return ret;
262}
263
264static inline int logfs_empty_dir(struct inode *dir)
265{
266 u64 data;
267
268 data = logfs_seek_data(dir, 0) << dir->i_sb->s_blocksize_bits;
269 return data >= i_size_read(dir);
270}
271
272static int logfs_rmdir(struct inode *dir, struct dentry *dentry)
273{
274 struct inode *inode = d_inode(dentry);
275
276 if (!logfs_empty_dir(inode))
277 return -ENOTEMPTY;
278
279 return logfs_unlink(dir, dentry);
280}
281
282/* FIXME: readdir currently has it's own dir_walk code. I don't see a good
283 * way to combine the two copies */
284static int logfs_readdir(struct file *file, struct dir_context *ctx)
285{
286 struct inode *dir = file_inode(file);
287 loff_t pos;
288 struct page *page;
289 struct logfs_disk_dentry *dd;
290
291 if (ctx->pos < 0)
292 return -EINVAL;
293
294 if (!dir_emit_dots(file, ctx))
295 return 0;
296
297 pos = ctx->pos - 2;
298 BUG_ON(pos < 0);
299 for (;; pos++, ctx->pos++) {
300 bool full;
301 if (beyond_eof(dir, pos))
302 break;
303 if (!logfs_exist_block(dir, pos)) {
304 /* deleted dentry */
305 pos = dir_seek_data(dir, pos);
306 continue;
307 }
308 page = read_cache_page(dir->i_mapping, pos,
309 (filler_t *)logfs_readpage, NULL);
310 if (IS_ERR(page))
311 return PTR_ERR(page);
312 dd = kmap(page);
313 BUG_ON(dd->namelen == 0);
314
315 full = !dir_emit(ctx, (char *)dd->name,
316 be16_to_cpu(dd->namelen),
317 be64_to_cpu(dd->ino), dd->type);
318 kunmap(page);
319 put_page(page);
320 if (full)
321 break;
322 }
323 return 0;
324}
325
326static void logfs_set_name(struct logfs_disk_dentry *dd, struct qstr *name)
327{
328 dd->namelen = cpu_to_be16(name->len);
329 memcpy(dd->name, name->name, name->len);
330}
331
332static struct dentry *logfs_lookup(struct inode *dir, struct dentry *dentry,
333 unsigned int flags)
334{
335 struct page *page;
336 struct logfs_disk_dentry *dd;
337 pgoff_t index;
338 u64 ino = 0;
339 struct inode *inode;
340
341 page = logfs_get_dd_page(dir, dentry);
342 if (IS_ERR(page))
343 return ERR_CAST(page);
344 if (!page) {
345 d_add(dentry, NULL);
346 return NULL;
347 }
348 index = page->index;
349 dd = kmap_atomic(page);
350 ino = be64_to_cpu(dd->ino);
351 kunmap_atomic(dd);
352 put_page(page);
353
354 inode = logfs_iget(dir->i_sb, ino);
355 if (IS_ERR(inode))
356 printk(KERN_ERR"LogFS: Cannot read inode #%llx for dentry (%lx, %lx)n",
357 ino, dir->i_ino, index);
358 return d_splice_alias(inode, dentry);
359}
360
361static void grow_dir(struct inode *dir, loff_t index)
362{
363 index = (index + 1) << dir->i_sb->s_blocksize_bits;
364 if (i_size_read(dir) < index)
365 i_size_write(dir, index);
366}
367
368static int logfs_write_dir(struct inode *dir, struct dentry *dentry,
369 struct inode *inode)
370{
371 struct page *page;
372 struct logfs_disk_dentry *dd;
373 u32 hash = hash_32(dentry->d_name.name, dentry->d_name.len, 0);
374 pgoff_t index;
375 int round, err;
376
377 for (round = 0; round < 20; round++) {
378 index = hash_index(hash, round);
379
380 if (logfs_exist_block(dir, index))
381 continue;
382 page = find_or_create_page(dir->i_mapping, index, GFP_KERNEL);
383 if (!page)
384 return -ENOMEM;
385
386 dd = kmap_atomic(page);
387 memset(dd, 0, sizeof(*dd));
388 dd->ino = cpu_to_be64(inode->i_ino);
389 dd->type = logfs_type(inode);
390 logfs_set_name(dd, &dentry->d_name);
391 kunmap_atomic(dd);
392
393 err = logfs_write_buf(dir, page, WF_LOCK);
394 unlock_page(page);
395 put_page(page);
396 if (!err)
397 grow_dir(dir, index);
398 return err;
399 }
400 /* FIXME: Is there a better return value? In most cases neither
401 * the filesystem nor the directory are full. But we have had
402 * too many collisions for this particular hash and no fallback.
403 */
404 return -ENOSPC;
405}
406
407static int __logfs_create(struct inode *dir, struct dentry *dentry,
408 struct inode *inode, const char *dest, long destlen)
409{
410 struct logfs_super *super = logfs_super(dir->i_sb);
411 struct logfs_inode *li = logfs_inode(inode);
412 struct logfs_transaction *ta;
413 int ret;
414
415 ta = kzalloc(sizeof(*ta), GFP_KERNEL);
416 if (!ta) {
417 drop_nlink(inode);
418 iput(inode);
419 return -ENOMEM;
420 }
421
422 ta->state = CREATE_1;
423 ta->ino = inode->i_ino;
424 mutex_lock(&super->s_dirop_mutex);
425 logfs_add_transaction(inode, ta);
426
427 if (dest) {
428 /* symlink */
429 ret = logfs_inode_write(inode, dest, destlen, 0, WF_LOCK, NULL);
430 if (!ret)
431 ret = write_inode(inode);
432 } else {
433 /* creat/mkdir/mknod */
434 ret = write_inode(inode);
435 }
436 if (ret) {
437 abort_transaction(inode, ta);
438 li->li_flags |= LOGFS_IF_STILLBORN;
439 /* FIXME: truncate symlink */
440 drop_nlink(inode);
441 iput(inode);
442 goto out;
443 }
444
445 ta->state = CREATE_2;
446 logfs_add_transaction(dir, ta);
447 ret = logfs_write_dir(dir, dentry, inode);
448 /* sync directory */
449 if (!ret)
450 ret = write_inode(dir);
451
452 if (ret) {
453 logfs_del_transaction(dir, ta);
454 ta->state = CREATE_2;
455 logfs_add_transaction(inode, ta);
456 logfs_remove_inode(inode);
457 iput(inode);
458 goto out;
459 }
460 d_instantiate(dentry, inode);
461out:
462 mutex_unlock(&super->s_dirop_mutex);
463 return ret;
464}
465
466static int logfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
467{
468 struct inode *inode;
469
470 /*
471 * FIXME: why do we have to fill in S_IFDIR, while the mode is
472 * correct for mknod, creat, etc.? Smells like the vfs *should*
473 * do it for us but for some reason fails to do so.
474 */
475 inode = logfs_new_inode(dir, S_IFDIR | mode);
476 if (IS_ERR(inode))
477 return PTR_ERR(inode);
478
479 inode->i_op = &logfs_dir_iops;
480 inode->i_fop = &logfs_dir_fops;
481
482 return __logfs_create(dir, dentry, inode, NULL, 0);
483}
484
485static int logfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
486 bool excl)
487{
488 struct inode *inode;
489
490 inode = logfs_new_inode(dir, mode);
491 if (IS_ERR(inode))
492 return PTR_ERR(inode);
493
494 inode->i_op = &logfs_reg_iops;
495 inode->i_fop = &logfs_reg_fops;
496 inode->i_mapping->a_ops = &logfs_reg_aops;
497
498 return __logfs_create(dir, dentry, inode, NULL, 0);
499}
500
501static int logfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
502 dev_t rdev)
503{
504 struct inode *inode;
505
506 if (dentry->d_name.len > LOGFS_MAX_NAMELEN)
507 return -ENAMETOOLONG;
508
509 inode = logfs_new_inode(dir, mode);
510 if (IS_ERR(inode))
511 return PTR_ERR(inode);
512
513 init_special_inode(inode, mode, rdev);
514
515 return __logfs_create(dir, dentry, inode, NULL, 0);
516}
517
518static int logfs_symlink(struct inode *dir, struct dentry *dentry,
519 const char *target)
520{
521 struct inode *inode;
522 size_t destlen = strlen(target) + 1;
523
524 if (destlen > dir->i_sb->s_blocksize)
525 return -ENAMETOOLONG;
526
527 inode = logfs_new_inode(dir, S_IFLNK | 0777);
528 if (IS_ERR(inode))
529 return PTR_ERR(inode);
530
531 inode->i_op = &page_symlink_inode_operations;
532 inode_nohighmem(inode);
533 inode->i_mapping->a_ops = &logfs_reg_aops;
534
535 return __logfs_create(dir, dentry, inode, target, destlen);
536}
537
538static int logfs_link(struct dentry *old_dentry, struct inode *dir,
539 struct dentry *dentry)
540{
541 struct inode *inode = d_inode(old_dentry);
542
543 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
544 ihold(inode);
545 inc_nlink(inode);
546 mark_inode_dirty_sync(inode);
547
548 return __logfs_create(dir, dentry, inode, NULL, 0);
549}
550
551static int logfs_get_dd(struct inode *dir, struct dentry *dentry,
552 struct logfs_disk_dentry *dd, loff_t *pos)
553{
554 struct page *page;
555 void *map;
556
557 page = logfs_get_dd_page(dir, dentry);
558 if (IS_ERR(page))
559 return PTR_ERR(page);
560 *pos = page->index;
561 map = kmap_atomic(page);
562 memcpy(dd, map, sizeof(*dd));
563 kunmap_atomic(map);
564 put_page(page);
565 return 0;
566}
567
568static int logfs_delete_dd(struct inode *dir, loff_t pos)
569{
570 /*
571 * Getting called with pos somewhere beyond eof is either a goofup
572 * within this file or means someone maliciously edited the
573 * (crc-protected) journal.
574 */
575 BUG_ON(beyond_eof(dir, pos));
576 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
577 log_dir(" Delete dentry (%lx, %llx)\n", dir->i_ino, pos);
578 return logfs_delete(dir, pos, NULL);
579}
580
581/*
582 * Cross-directory rename, target does not exist. Just a little nasty.
583 * Create a new dentry in the target dir, then remove the old dentry,
584 * all the while taking care to remember our operation in the journal.
585 */
586static int logfs_rename_cross(struct inode *old_dir, struct dentry *old_dentry,
587 struct inode *new_dir, struct dentry *new_dentry)
588{
589 struct logfs_super *super = logfs_super(old_dir->i_sb);
590 struct logfs_disk_dentry dd;
591 struct logfs_transaction *ta;
592 loff_t pos;
593 int err;
594
595 /* 1. locate source dd */
596 err = logfs_get_dd(old_dir, old_dentry, &dd, &pos);
597 if (err)
598 return err;
599
600 ta = kzalloc(sizeof(*ta), GFP_KERNEL);
601 if (!ta)
602 return -ENOMEM;
603
604 ta->state = CROSS_RENAME_1;
605 ta->dir = old_dir->i_ino;
606 ta->pos = pos;
607
608 /* 2. write target dd */
609 mutex_lock(&super->s_dirop_mutex);
610 logfs_add_transaction(new_dir, ta);
611 err = logfs_write_dir(new_dir, new_dentry, d_inode(old_dentry));
612 if (!err)
613 err = write_inode(new_dir);
614
615 if (err) {
616 super->s_rename_dir = 0;
617 super->s_rename_pos = 0;
618 abort_transaction(new_dir, ta);
619 goto out;
620 }
621
622 /* 3. remove source dd */
623 ta->state = CROSS_RENAME_2;
624 logfs_add_transaction(old_dir, ta);
625 err = logfs_delete_dd(old_dir, pos);
626 if (!err)
627 err = write_inode(old_dir);
628 LOGFS_BUG_ON(err, old_dir->i_sb);
629out:
630 mutex_unlock(&super->s_dirop_mutex);
631 return err;
632}
633
634static int logfs_replace_inode(struct inode *dir, struct dentry *dentry,
635 struct logfs_disk_dentry *dd, struct inode *inode)
636{
637 loff_t pos;
638 int err;
639
640 err = logfs_get_dd(dir, dentry, dd, &pos);
641 if (err)
642 return err;
643 dd->ino = cpu_to_be64(inode->i_ino);
644 dd->type = logfs_type(inode);
645
646 err = write_dir(dir, dd, pos);
647 if (err)
648 return err;
649 log_dir("Replace dentry (%lx, %llx) %s -> %llx\n", dir->i_ino, pos,
650 dd->name, be64_to_cpu(dd->ino));
651 return write_inode(dir);
652}
653
654/* Target dentry exists - the worst case. We need to attach the source
655 * inode to the target dentry, then remove the orphaned target inode and
656 * source dentry.
657 */
658static int logfs_rename_target(struct inode *old_dir, struct dentry *old_dentry,
659 struct inode *new_dir, struct dentry *new_dentry)
660{
661 struct logfs_super *super = logfs_super(old_dir->i_sb);
662 struct inode *old_inode = d_inode(old_dentry);
663 struct inode *new_inode = d_inode(new_dentry);
664 int isdir = S_ISDIR(old_inode->i_mode);
665 struct logfs_disk_dentry dd;
666 struct logfs_transaction *ta;
667 loff_t pos;
668 int err;
669
670 BUG_ON(isdir != S_ISDIR(new_inode->i_mode));
671 if (isdir) {
672 if (!logfs_empty_dir(new_inode))
673 return -ENOTEMPTY;
674 }
675
676 /* 1. locate source dd */
677 err = logfs_get_dd(old_dir, old_dentry, &dd, &pos);
678 if (err)
679 return err;
680
681 ta = kzalloc(sizeof(*ta), GFP_KERNEL);
682 if (!ta)
683 return -ENOMEM;
684
685 ta->state = TARGET_RENAME_1;
686 ta->dir = old_dir->i_ino;
687 ta->pos = pos;
688 ta->ino = new_inode->i_ino;
689
690 /* 2. attach source inode to target dd */
691 mutex_lock(&super->s_dirop_mutex);
692 logfs_add_transaction(new_dir, ta);
693 err = logfs_replace_inode(new_dir, new_dentry, &dd, old_inode);
694 if (err) {
695 super->s_rename_dir = 0;
696 super->s_rename_pos = 0;
697 super->s_victim_ino = 0;
698 abort_transaction(new_dir, ta);
699 goto out;
700 }
701
702 /* 3. remove source dd */
703 ta->state = TARGET_RENAME_2;
704 logfs_add_transaction(old_dir, ta);
705 err = logfs_delete_dd(old_dir, pos);
706 if (!err)
707 err = write_inode(old_dir);
708 LOGFS_BUG_ON(err, old_dir->i_sb);
709
710 /* 4. remove target inode */
711 ta->state = TARGET_RENAME_3;
712 logfs_add_transaction(new_inode, ta);
713 err = logfs_remove_inode(new_inode);
714
715out:
716 mutex_unlock(&super->s_dirop_mutex);
717 return err;
718}
719
720static int logfs_rename(struct inode *old_dir, struct dentry *old_dentry,
721 struct inode *new_dir, struct dentry *new_dentry)
722{
723 if (d_really_is_positive(new_dentry))
724 return logfs_rename_target(old_dir, old_dentry,
725 new_dir, new_dentry);
726 return logfs_rename_cross(old_dir, old_dentry, new_dir, new_dentry);
727}
728
729/* No locking done here, as this is called before .get_sb() returns. */
730int logfs_replay_journal(struct super_block *sb)
731{
732 struct logfs_super *super = logfs_super(sb);
733 struct inode *inode;
734 u64 ino, pos;
735 int err;
736
737 if (super->s_victim_ino) {
738 /* delete victim inode */
739 ino = super->s_victim_ino;
740 printk(KERN_INFO"LogFS: delete unmapped inode #%llx\n", ino);
741 inode = logfs_iget(sb, ino);
742 if (IS_ERR(inode))
743 goto fail;
744
745 LOGFS_BUG_ON(i_size_read(inode) > 0, sb);
746 super->s_victim_ino = 0;
747 err = logfs_remove_inode(inode);
748 iput(inode);
749 if (err) {
750 super->s_victim_ino = ino;
751 goto fail;
752 }
753 }
754 if (super->s_rename_dir) {
755 /* delete old dd from rename */
756 ino = super->s_rename_dir;
757 pos = super->s_rename_pos;
758 printk(KERN_INFO"LogFS: delete unbacked dentry (%llx, %llx)\n",
759 ino, pos);
760 inode = logfs_iget(sb, ino);
761 if (IS_ERR(inode))
762 goto fail;
763
764 super->s_rename_dir = 0;
765 super->s_rename_pos = 0;
766 err = logfs_delete_dd(inode, pos);
767 iput(inode);
768 if (err) {
769 super->s_rename_dir = ino;
770 super->s_rename_pos = pos;
771 goto fail;
772 }
773 }
774 return 0;
775fail:
776 LOGFS_BUG(sb);
777 return -EIO;
778}
779
780const struct inode_operations logfs_dir_iops = {
781 .create = logfs_create,
782 .link = logfs_link,
783 .lookup = logfs_lookup,
784 .mkdir = logfs_mkdir,
785 .mknod = logfs_mknod,
786 .rename = logfs_rename,
787 .rmdir = logfs_rmdir,
788 .symlink = logfs_symlink,
789 .unlink = logfs_unlink,
790};
791const struct file_operations logfs_dir_fops = {
792 .fsync = logfs_fsync,
793 .unlocked_ioctl = logfs_ioctl,
794 .iterate = logfs_readdir,
795 .read = generic_read_dir,
796 .llseek = default_llseek,
797};