Loading...
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * NILFS checkpoint file.
4 *
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Koji Sato.
8 */
9
10#include <linux/kernel.h>
11#include <linux/fs.h>
12#include <linux/string.h>
13#include <linux/buffer_head.h>
14#include <linux/errno.h>
15#include "mdt.h"
16#include "cpfile.h"
17
18
19static inline unsigned long
20nilfs_cpfile_checkpoints_per_block(const struct inode *cpfile)
21{
22 return NILFS_MDT(cpfile)->mi_entries_per_block;
23}
24
25/* block number from the beginning of the file */
26static unsigned long
27nilfs_cpfile_get_blkoff(const struct inode *cpfile, __u64 cno)
28{
29 __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
30
31 do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile));
32 return (unsigned long)tcno;
33}
34
35/* offset in block */
36static unsigned long
37nilfs_cpfile_get_offset(const struct inode *cpfile, __u64 cno)
38{
39 __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
40
41 return do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile));
42}
43
44static __u64 nilfs_cpfile_first_checkpoint_in_block(const struct inode *cpfile,
45 unsigned long blkoff)
46{
47 return (__u64)nilfs_cpfile_checkpoints_per_block(cpfile) * blkoff
48 + 1 - NILFS_MDT(cpfile)->mi_first_entry_offset;
49}
50
51static unsigned long
52nilfs_cpfile_checkpoints_in_block(const struct inode *cpfile,
53 __u64 curr,
54 __u64 max)
55{
56 return min_t(__u64,
57 nilfs_cpfile_checkpoints_per_block(cpfile) -
58 nilfs_cpfile_get_offset(cpfile, curr),
59 max - curr);
60}
61
62static inline int nilfs_cpfile_is_in_first(const struct inode *cpfile,
63 __u64 cno)
64{
65 return nilfs_cpfile_get_blkoff(cpfile, cno) == 0;
66}
67
68static unsigned int
69nilfs_cpfile_block_add_valid_checkpoints(const struct inode *cpfile,
70 struct buffer_head *bh,
71 void *kaddr,
72 unsigned int n)
73{
74 struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
75 unsigned int count;
76
77 count = le32_to_cpu(cp->cp_checkpoints_count) + n;
78 cp->cp_checkpoints_count = cpu_to_le32(count);
79 return count;
80}
81
82static unsigned int
83nilfs_cpfile_block_sub_valid_checkpoints(const struct inode *cpfile,
84 struct buffer_head *bh,
85 void *kaddr,
86 unsigned int n)
87{
88 struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
89 unsigned int count;
90
91 WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n);
92 count = le32_to_cpu(cp->cp_checkpoints_count) - n;
93 cp->cp_checkpoints_count = cpu_to_le32(count);
94 return count;
95}
96
97static inline struct nilfs_cpfile_header *
98nilfs_cpfile_block_get_header(const struct inode *cpfile,
99 struct buffer_head *bh,
100 void *kaddr)
101{
102 return kaddr + bh_offset(bh);
103}
104
105static struct nilfs_checkpoint *
106nilfs_cpfile_block_get_checkpoint(const struct inode *cpfile, __u64 cno,
107 struct buffer_head *bh,
108 void *kaddr)
109{
110 return kaddr + bh_offset(bh) + nilfs_cpfile_get_offset(cpfile, cno) *
111 NILFS_MDT(cpfile)->mi_entry_size;
112}
113
114static void nilfs_cpfile_block_init(struct inode *cpfile,
115 struct buffer_head *bh,
116 void *kaddr)
117{
118 struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
119 size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
120 int n = nilfs_cpfile_checkpoints_per_block(cpfile);
121
122 while (n-- > 0) {
123 nilfs_checkpoint_set_invalid(cp);
124 cp = (void *)cp + cpsz;
125 }
126}
127
128static inline int nilfs_cpfile_get_header_block(struct inode *cpfile,
129 struct buffer_head **bhp)
130{
131 return nilfs_mdt_get_block(cpfile, 0, 0, NULL, bhp);
132}
133
134static inline int nilfs_cpfile_get_checkpoint_block(struct inode *cpfile,
135 __u64 cno,
136 int create,
137 struct buffer_head **bhp)
138{
139 return nilfs_mdt_get_block(cpfile,
140 nilfs_cpfile_get_blkoff(cpfile, cno),
141 create, nilfs_cpfile_block_init, bhp);
142}
143
144/**
145 * nilfs_cpfile_find_checkpoint_block - find and get a buffer on cpfile
146 * @cpfile: inode of cpfile
147 * @start_cno: start checkpoint number (inclusive)
148 * @end_cno: end checkpoint number (inclusive)
149 * @cnop: place to store the next checkpoint number
150 * @bhp: place to store a pointer to buffer_head struct
151 *
152 * Return Value: On success, it returns 0. On error, the following negative
153 * error code is returned.
154 *
155 * %-ENOMEM - Insufficient memory available.
156 *
157 * %-EIO - I/O error
158 *
159 * %-ENOENT - no block exists in the range.
160 */
161static int nilfs_cpfile_find_checkpoint_block(struct inode *cpfile,
162 __u64 start_cno, __u64 end_cno,
163 __u64 *cnop,
164 struct buffer_head **bhp)
165{
166 unsigned long start, end, blkoff;
167 int ret;
168
169 if (unlikely(start_cno > end_cno))
170 return -ENOENT;
171
172 start = nilfs_cpfile_get_blkoff(cpfile, start_cno);
173 end = nilfs_cpfile_get_blkoff(cpfile, end_cno);
174
175 ret = nilfs_mdt_find_block(cpfile, start, end, &blkoff, bhp);
176 if (!ret)
177 *cnop = (blkoff == start) ? start_cno :
178 nilfs_cpfile_first_checkpoint_in_block(cpfile, blkoff);
179 return ret;
180}
181
182static inline int nilfs_cpfile_delete_checkpoint_block(struct inode *cpfile,
183 __u64 cno)
184{
185 return nilfs_mdt_delete_block(cpfile,
186 nilfs_cpfile_get_blkoff(cpfile, cno));
187}
188
189/**
190 * nilfs_cpfile_get_checkpoint - get a checkpoint
191 * @cpfile: inode of checkpoint file
192 * @cno: checkpoint number
193 * @create: create flag
194 * @cpp: pointer to a checkpoint
195 * @bhp: pointer to a buffer head
196 *
197 * Description: nilfs_cpfile_get_checkpoint() acquires the checkpoint
198 * specified by @cno. A new checkpoint will be created if @cno is the current
199 * checkpoint number and @create is nonzero.
200 *
201 * Return Value: On success, 0 is returned, and the checkpoint and the
202 * buffer head of the buffer on which the checkpoint is located are stored in
203 * the place pointed by @cpp and @bhp, respectively. On error, one of the
204 * following negative error codes is returned.
205 *
206 * %-EIO - I/O error.
207 *
208 * %-ENOMEM - Insufficient amount of memory available.
209 *
210 * %-ENOENT - No such checkpoint.
211 *
212 * %-EINVAL - invalid checkpoint.
213 */
214int nilfs_cpfile_get_checkpoint(struct inode *cpfile,
215 __u64 cno,
216 int create,
217 struct nilfs_checkpoint **cpp,
218 struct buffer_head **bhp)
219{
220 struct buffer_head *header_bh, *cp_bh;
221 struct nilfs_cpfile_header *header;
222 struct nilfs_checkpoint *cp;
223 void *kaddr;
224 int ret;
225
226 if (unlikely(cno < 1 || cno > nilfs_mdt_cno(cpfile) ||
227 (cno < nilfs_mdt_cno(cpfile) && create)))
228 return -EINVAL;
229
230 down_write(&NILFS_MDT(cpfile)->mi_sem);
231
232 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
233 if (ret < 0)
234 goto out_sem;
235 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, create, &cp_bh);
236 if (ret < 0)
237 goto out_header;
238 kaddr = kmap(cp_bh->b_page);
239 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
240 if (nilfs_checkpoint_invalid(cp)) {
241 if (!create) {
242 kunmap(cp_bh->b_page);
243 brelse(cp_bh);
244 ret = -ENOENT;
245 goto out_header;
246 }
247 /* a newly-created checkpoint */
248 nilfs_checkpoint_clear_invalid(cp);
249 if (!nilfs_cpfile_is_in_first(cpfile, cno))
250 nilfs_cpfile_block_add_valid_checkpoints(cpfile, cp_bh,
251 kaddr, 1);
252 mark_buffer_dirty(cp_bh);
253
254 kaddr = kmap_atomic(header_bh->b_page);
255 header = nilfs_cpfile_block_get_header(cpfile, header_bh,
256 kaddr);
257 le64_add_cpu(&header->ch_ncheckpoints, 1);
258 kunmap_atomic(kaddr);
259 mark_buffer_dirty(header_bh);
260 nilfs_mdt_mark_dirty(cpfile);
261 }
262
263 if (cpp != NULL)
264 *cpp = cp;
265 *bhp = cp_bh;
266
267 out_header:
268 brelse(header_bh);
269
270 out_sem:
271 up_write(&NILFS_MDT(cpfile)->mi_sem);
272 return ret;
273}
274
275/**
276 * nilfs_cpfile_put_checkpoint - put a checkpoint
277 * @cpfile: inode of checkpoint file
278 * @cno: checkpoint number
279 * @bh: buffer head
280 *
281 * Description: nilfs_cpfile_put_checkpoint() releases the checkpoint
282 * specified by @cno. @bh must be the buffer head which has been returned by
283 * a previous call to nilfs_cpfile_get_checkpoint() with @cno.
284 */
285void nilfs_cpfile_put_checkpoint(struct inode *cpfile, __u64 cno,
286 struct buffer_head *bh)
287{
288 kunmap(bh->b_page);
289 brelse(bh);
290}
291
292/**
293 * nilfs_cpfile_delete_checkpoints - delete checkpoints
294 * @cpfile: inode of checkpoint file
295 * @start: start checkpoint number
296 * @end: end checkpoint number
297 *
298 * Description: nilfs_cpfile_delete_checkpoints() deletes the checkpoints in
299 * the period from @start to @end, excluding @end itself. The checkpoints
300 * which have been already deleted are ignored.
301 *
302 * Return Value: On success, 0 is returned. On error, one of the following
303 * negative error codes is returned.
304 *
305 * %-EIO - I/O error.
306 *
307 * %-ENOMEM - Insufficient amount of memory available.
308 *
309 * %-EINVAL - invalid checkpoints.
310 */
311int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
312 __u64 start,
313 __u64 end)
314{
315 struct buffer_head *header_bh, *cp_bh;
316 struct nilfs_cpfile_header *header;
317 struct nilfs_checkpoint *cp;
318 size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
319 __u64 cno;
320 void *kaddr;
321 unsigned long tnicps;
322 int ret, ncps, nicps, nss, count, i;
323
324 if (unlikely(start == 0 || start > end)) {
325 nilfs_err(cpfile->i_sb,
326 "cannot delete checkpoints: invalid range [%llu, %llu)",
327 (unsigned long long)start, (unsigned long long)end);
328 return -EINVAL;
329 }
330
331 down_write(&NILFS_MDT(cpfile)->mi_sem);
332
333 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
334 if (ret < 0)
335 goto out_sem;
336 tnicps = 0;
337 nss = 0;
338
339 for (cno = start; cno < end; cno += ncps) {
340 ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, end);
341 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
342 if (ret < 0) {
343 if (ret != -ENOENT)
344 break;
345 /* skip hole */
346 ret = 0;
347 continue;
348 }
349
350 kaddr = kmap_atomic(cp_bh->b_page);
351 cp = nilfs_cpfile_block_get_checkpoint(
352 cpfile, cno, cp_bh, kaddr);
353 nicps = 0;
354 for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) {
355 if (nilfs_checkpoint_snapshot(cp)) {
356 nss++;
357 } else if (!nilfs_checkpoint_invalid(cp)) {
358 nilfs_checkpoint_set_invalid(cp);
359 nicps++;
360 }
361 }
362 if (nicps > 0) {
363 tnicps += nicps;
364 mark_buffer_dirty(cp_bh);
365 nilfs_mdt_mark_dirty(cpfile);
366 if (!nilfs_cpfile_is_in_first(cpfile, cno)) {
367 count =
368 nilfs_cpfile_block_sub_valid_checkpoints(
369 cpfile, cp_bh, kaddr, nicps);
370 if (count == 0) {
371 /* make hole */
372 kunmap_atomic(kaddr);
373 brelse(cp_bh);
374 ret =
375 nilfs_cpfile_delete_checkpoint_block(
376 cpfile, cno);
377 if (ret == 0)
378 continue;
379 nilfs_err(cpfile->i_sb,
380 "error %d deleting checkpoint block",
381 ret);
382 break;
383 }
384 }
385 }
386
387 kunmap_atomic(kaddr);
388 brelse(cp_bh);
389 }
390
391 if (tnicps > 0) {
392 kaddr = kmap_atomic(header_bh->b_page);
393 header = nilfs_cpfile_block_get_header(cpfile, header_bh,
394 kaddr);
395 le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps);
396 mark_buffer_dirty(header_bh);
397 nilfs_mdt_mark_dirty(cpfile);
398 kunmap_atomic(kaddr);
399 }
400
401 brelse(header_bh);
402 if (nss > 0)
403 ret = -EBUSY;
404
405 out_sem:
406 up_write(&NILFS_MDT(cpfile)->mi_sem);
407 return ret;
408}
409
410static void nilfs_cpfile_checkpoint_to_cpinfo(struct inode *cpfile,
411 struct nilfs_checkpoint *cp,
412 struct nilfs_cpinfo *ci)
413{
414 ci->ci_flags = le32_to_cpu(cp->cp_flags);
415 ci->ci_cno = le64_to_cpu(cp->cp_cno);
416 ci->ci_create = le64_to_cpu(cp->cp_create);
417 ci->ci_nblk_inc = le64_to_cpu(cp->cp_nblk_inc);
418 ci->ci_inodes_count = le64_to_cpu(cp->cp_inodes_count);
419 ci->ci_blocks_count = le64_to_cpu(cp->cp_blocks_count);
420 ci->ci_next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
421}
422
423static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
424 void *buf, unsigned int cisz,
425 size_t nci)
426{
427 struct nilfs_checkpoint *cp;
428 struct nilfs_cpinfo *ci = buf;
429 struct buffer_head *bh;
430 size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
431 __u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop;
432 void *kaddr;
433 int n, ret;
434 int ncps, i;
435
436 if (cno == 0)
437 return -ENOENT; /* checkpoint number 0 is invalid */
438 down_read(&NILFS_MDT(cpfile)->mi_sem);
439
440 for (n = 0; n < nci; cno += ncps) {
441 ret = nilfs_cpfile_find_checkpoint_block(
442 cpfile, cno, cur_cno - 1, &cno, &bh);
443 if (ret < 0) {
444 if (likely(ret == -ENOENT))
445 break;
446 goto out;
447 }
448 ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno);
449
450 kaddr = kmap_atomic(bh->b_page);
451 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
452 for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) {
453 if (!nilfs_checkpoint_invalid(cp)) {
454 nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp,
455 ci);
456 ci = (void *)ci + cisz;
457 n++;
458 }
459 }
460 kunmap_atomic(kaddr);
461 brelse(bh);
462 }
463
464 ret = n;
465 if (n > 0) {
466 ci = (void *)ci - cisz;
467 *cnop = ci->ci_cno + 1;
468 }
469
470 out:
471 up_read(&NILFS_MDT(cpfile)->mi_sem);
472 return ret;
473}
474
475static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
476 void *buf, unsigned int cisz,
477 size_t nci)
478{
479 struct buffer_head *bh;
480 struct nilfs_cpfile_header *header;
481 struct nilfs_checkpoint *cp;
482 struct nilfs_cpinfo *ci = buf;
483 __u64 curr = *cnop, next;
484 unsigned long curr_blkoff, next_blkoff;
485 void *kaddr;
486 int n = 0, ret;
487
488 down_read(&NILFS_MDT(cpfile)->mi_sem);
489
490 if (curr == 0) {
491 ret = nilfs_cpfile_get_header_block(cpfile, &bh);
492 if (ret < 0)
493 goto out;
494 kaddr = kmap_atomic(bh->b_page);
495 header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
496 curr = le64_to_cpu(header->ch_snapshot_list.ssl_next);
497 kunmap_atomic(kaddr);
498 brelse(bh);
499 if (curr == 0) {
500 ret = 0;
501 goto out;
502 }
503 } else if (unlikely(curr == ~(__u64)0)) {
504 ret = 0;
505 goto out;
506 }
507
508 curr_blkoff = nilfs_cpfile_get_blkoff(cpfile, curr);
509 ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, 0, &bh);
510 if (unlikely(ret < 0)) {
511 if (ret == -ENOENT)
512 ret = 0; /* No snapshots (started from a hole block) */
513 goto out;
514 }
515 kaddr = kmap_atomic(bh->b_page);
516 while (n < nci) {
517 cp = nilfs_cpfile_block_get_checkpoint(cpfile, curr, bh, kaddr);
518 curr = ~(__u64)0; /* Terminator */
519 if (unlikely(nilfs_checkpoint_invalid(cp) ||
520 !nilfs_checkpoint_snapshot(cp)))
521 break;
522 nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, ci);
523 ci = (void *)ci + cisz;
524 n++;
525 next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
526 if (next == 0)
527 break; /* reach end of the snapshot list */
528
529 next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next);
530 if (curr_blkoff != next_blkoff) {
531 kunmap_atomic(kaddr);
532 brelse(bh);
533 ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
534 0, &bh);
535 if (unlikely(ret < 0)) {
536 WARN_ON(ret == -ENOENT);
537 goto out;
538 }
539 kaddr = kmap_atomic(bh->b_page);
540 }
541 curr = next;
542 curr_blkoff = next_blkoff;
543 }
544 kunmap_atomic(kaddr);
545 brelse(bh);
546 *cnop = curr;
547 ret = n;
548
549 out:
550 up_read(&NILFS_MDT(cpfile)->mi_sem);
551 return ret;
552}
553
554/**
555 * nilfs_cpfile_get_cpinfo -
556 * @cpfile:
557 * @cno:
558 * @ci:
559 * @nci:
560 */
561
562ssize_t nilfs_cpfile_get_cpinfo(struct inode *cpfile, __u64 *cnop, int mode,
563 void *buf, unsigned int cisz, size_t nci)
564{
565 switch (mode) {
566 case NILFS_CHECKPOINT:
567 return nilfs_cpfile_do_get_cpinfo(cpfile, cnop, buf, cisz, nci);
568 case NILFS_SNAPSHOT:
569 return nilfs_cpfile_do_get_ssinfo(cpfile, cnop, buf, cisz, nci);
570 default:
571 return -EINVAL;
572 }
573}
574
575/**
576 * nilfs_cpfile_delete_checkpoint -
577 * @cpfile:
578 * @cno:
579 */
580int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
581{
582 struct nilfs_cpinfo ci;
583 __u64 tcno = cno;
584 ssize_t nci;
585
586 nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, sizeof(ci), 1);
587 if (nci < 0)
588 return nci;
589 else if (nci == 0 || ci.ci_cno != cno)
590 return -ENOENT;
591 else if (nilfs_cpinfo_snapshot(&ci))
592 return -EBUSY;
593
594 return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1);
595}
596
597static struct nilfs_snapshot_list *
598nilfs_cpfile_block_get_snapshot_list(const struct inode *cpfile,
599 __u64 cno,
600 struct buffer_head *bh,
601 void *kaddr)
602{
603 struct nilfs_cpfile_header *header;
604 struct nilfs_checkpoint *cp;
605 struct nilfs_snapshot_list *list;
606
607 if (cno != 0) {
608 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
609 list = &cp->cp_snapshot_list;
610 } else {
611 header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
612 list = &header->ch_snapshot_list;
613 }
614 return list;
615}
616
617static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
618{
619 struct buffer_head *header_bh, *curr_bh, *prev_bh, *cp_bh;
620 struct nilfs_cpfile_header *header;
621 struct nilfs_checkpoint *cp;
622 struct nilfs_snapshot_list *list;
623 __u64 curr, prev;
624 unsigned long curr_blkoff, prev_blkoff;
625 void *kaddr;
626 int ret;
627
628 if (cno == 0)
629 return -ENOENT; /* checkpoint number 0 is invalid */
630 down_write(&NILFS_MDT(cpfile)->mi_sem);
631
632 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
633 if (ret < 0)
634 goto out_sem;
635 kaddr = kmap_atomic(cp_bh->b_page);
636 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
637 if (nilfs_checkpoint_invalid(cp)) {
638 ret = -ENOENT;
639 kunmap_atomic(kaddr);
640 goto out_cp;
641 }
642 if (nilfs_checkpoint_snapshot(cp)) {
643 ret = 0;
644 kunmap_atomic(kaddr);
645 goto out_cp;
646 }
647 kunmap_atomic(kaddr);
648
649 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
650 if (ret < 0)
651 goto out_cp;
652 kaddr = kmap_atomic(header_bh->b_page);
653 header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
654 list = &header->ch_snapshot_list;
655 curr_bh = header_bh;
656 get_bh(curr_bh);
657 curr = 0;
658 curr_blkoff = 0;
659 prev = le64_to_cpu(list->ssl_prev);
660 while (prev > cno) {
661 prev_blkoff = nilfs_cpfile_get_blkoff(cpfile, prev);
662 curr = prev;
663 if (curr_blkoff != prev_blkoff) {
664 kunmap_atomic(kaddr);
665 brelse(curr_bh);
666 ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr,
667 0, &curr_bh);
668 if (ret < 0)
669 goto out_header;
670 kaddr = kmap_atomic(curr_bh->b_page);
671 }
672 curr_blkoff = prev_blkoff;
673 cp = nilfs_cpfile_block_get_checkpoint(
674 cpfile, curr, curr_bh, kaddr);
675 list = &cp->cp_snapshot_list;
676 prev = le64_to_cpu(list->ssl_prev);
677 }
678 kunmap_atomic(kaddr);
679
680 if (prev != 0) {
681 ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
682 &prev_bh);
683 if (ret < 0)
684 goto out_curr;
685 } else {
686 prev_bh = header_bh;
687 get_bh(prev_bh);
688 }
689
690 kaddr = kmap_atomic(curr_bh->b_page);
691 list = nilfs_cpfile_block_get_snapshot_list(
692 cpfile, curr, curr_bh, kaddr);
693 list->ssl_prev = cpu_to_le64(cno);
694 kunmap_atomic(kaddr);
695
696 kaddr = kmap_atomic(cp_bh->b_page);
697 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
698 cp->cp_snapshot_list.ssl_next = cpu_to_le64(curr);
699 cp->cp_snapshot_list.ssl_prev = cpu_to_le64(prev);
700 nilfs_checkpoint_set_snapshot(cp);
701 kunmap_atomic(kaddr);
702
703 kaddr = kmap_atomic(prev_bh->b_page);
704 list = nilfs_cpfile_block_get_snapshot_list(
705 cpfile, prev, prev_bh, kaddr);
706 list->ssl_next = cpu_to_le64(cno);
707 kunmap_atomic(kaddr);
708
709 kaddr = kmap_atomic(header_bh->b_page);
710 header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
711 le64_add_cpu(&header->ch_nsnapshots, 1);
712 kunmap_atomic(kaddr);
713
714 mark_buffer_dirty(prev_bh);
715 mark_buffer_dirty(curr_bh);
716 mark_buffer_dirty(cp_bh);
717 mark_buffer_dirty(header_bh);
718 nilfs_mdt_mark_dirty(cpfile);
719
720 brelse(prev_bh);
721
722 out_curr:
723 brelse(curr_bh);
724
725 out_header:
726 brelse(header_bh);
727
728 out_cp:
729 brelse(cp_bh);
730
731 out_sem:
732 up_write(&NILFS_MDT(cpfile)->mi_sem);
733 return ret;
734}
735
736static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno)
737{
738 struct buffer_head *header_bh, *next_bh, *prev_bh, *cp_bh;
739 struct nilfs_cpfile_header *header;
740 struct nilfs_checkpoint *cp;
741 struct nilfs_snapshot_list *list;
742 __u64 next, prev;
743 void *kaddr;
744 int ret;
745
746 if (cno == 0)
747 return -ENOENT; /* checkpoint number 0 is invalid */
748 down_write(&NILFS_MDT(cpfile)->mi_sem);
749
750 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
751 if (ret < 0)
752 goto out_sem;
753 kaddr = kmap_atomic(cp_bh->b_page);
754 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
755 if (nilfs_checkpoint_invalid(cp)) {
756 ret = -ENOENT;
757 kunmap_atomic(kaddr);
758 goto out_cp;
759 }
760 if (!nilfs_checkpoint_snapshot(cp)) {
761 ret = 0;
762 kunmap_atomic(kaddr);
763 goto out_cp;
764 }
765
766 list = &cp->cp_snapshot_list;
767 next = le64_to_cpu(list->ssl_next);
768 prev = le64_to_cpu(list->ssl_prev);
769 kunmap_atomic(kaddr);
770
771 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
772 if (ret < 0)
773 goto out_cp;
774 if (next != 0) {
775 ret = nilfs_cpfile_get_checkpoint_block(cpfile, next, 0,
776 &next_bh);
777 if (ret < 0)
778 goto out_header;
779 } else {
780 next_bh = header_bh;
781 get_bh(next_bh);
782 }
783 if (prev != 0) {
784 ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
785 &prev_bh);
786 if (ret < 0)
787 goto out_next;
788 } else {
789 prev_bh = header_bh;
790 get_bh(prev_bh);
791 }
792
793 kaddr = kmap_atomic(next_bh->b_page);
794 list = nilfs_cpfile_block_get_snapshot_list(
795 cpfile, next, next_bh, kaddr);
796 list->ssl_prev = cpu_to_le64(prev);
797 kunmap_atomic(kaddr);
798
799 kaddr = kmap_atomic(prev_bh->b_page);
800 list = nilfs_cpfile_block_get_snapshot_list(
801 cpfile, prev, prev_bh, kaddr);
802 list->ssl_next = cpu_to_le64(next);
803 kunmap_atomic(kaddr);
804
805 kaddr = kmap_atomic(cp_bh->b_page);
806 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
807 cp->cp_snapshot_list.ssl_next = cpu_to_le64(0);
808 cp->cp_snapshot_list.ssl_prev = cpu_to_le64(0);
809 nilfs_checkpoint_clear_snapshot(cp);
810 kunmap_atomic(kaddr);
811
812 kaddr = kmap_atomic(header_bh->b_page);
813 header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
814 le64_add_cpu(&header->ch_nsnapshots, -1);
815 kunmap_atomic(kaddr);
816
817 mark_buffer_dirty(next_bh);
818 mark_buffer_dirty(prev_bh);
819 mark_buffer_dirty(cp_bh);
820 mark_buffer_dirty(header_bh);
821 nilfs_mdt_mark_dirty(cpfile);
822
823 brelse(prev_bh);
824
825 out_next:
826 brelse(next_bh);
827
828 out_header:
829 brelse(header_bh);
830
831 out_cp:
832 brelse(cp_bh);
833
834 out_sem:
835 up_write(&NILFS_MDT(cpfile)->mi_sem);
836 return ret;
837}
838
839/**
840 * nilfs_cpfile_is_snapshot -
841 * @cpfile: inode of checkpoint file
842 * @cno: checkpoint number
843 *
844 * Description:
845 *
846 * Return Value: On success, 1 is returned if the checkpoint specified by
847 * @cno is a snapshot, or 0 if not. On error, one of the following negative
848 * error codes is returned.
849 *
850 * %-EIO - I/O error.
851 *
852 * %-ENOMEM - Insufficient amount of memory available.
853 *
854 * %-ENOENT - No such checkpoint.
855 */
856int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
857{
858 struct buffer_head *bh;
859 struct nilfs_checkpoint *cp;
860 void *kaddr;
861 int ret;
862
863 /*
864 * CP number is invalid if it's zero or larger than the
865 * largest existing one.
866 */
867 if (cno == 0 || cno >= nilfs_mdt_cno(cpfile))
868 return -ENOENT;
869 down_read(&NILFS_MDT(cpfile)->mi_sem);
870
871 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
872 if (ret < 0)
873 goto out;
874 kaddr = kmap_atomic(bh->b_page);
875 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
876 if (nilfs_checkpoint_invalid(cp))
877 ret = -ENOENT;
878 else
879 ret = nilfs_checkpoint_snapshot(cp);
880 kunmap_atomic(kaddr);
881 brelse(bh);
882
883 out:
884 up_read(&NILFS_MDT(cpfile)->mi_sem);
885 return ret;
886}
887
888/**
889 * nilfs_cpfile_change_cpmode - change checkpoint mode
890 * @cpfile: inode of checkpoint file
891 * @cno: checkpoint number
892 * @mode: mode of checkpoint
893 *
894 * Description: nilfs_change_cpmode() changes the mode of the checkpoint
895 * specified by @cno. The mode @mode is NILFS_CHECKPOINT or NILFS_SNAPSHOT.
896 *
897 * Return Value: On success, 0 is returned. On error, one of the following
898 * negative error codes is returned.
899 *
900 * %-EIO - I/O error.
901 *
902 * %-ENOMEM - Insufficient amount of memory available.
903 *
904 * %-ENOENT - No such checkpoint.
905 */
906int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
907{
908 int ret;
909
910 switch (mode) {
911 case NILFS_CHECKPOINT:
912 if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno))
913 /*
914 * Current implementation does not have to protect
915 * plain read-only mounts since they are exclusive
916 * with a read/write mount and are protected from the
917 * cleaner.
918 */
919 ret = -EBUSY;
920 else
921 ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
922 return ret;
923 case NILFS_SNAPSHOT:
924 return nilfs_cpfile_set_snapshot(cpfile, cno);
925 default:
926 return -EINVAL;
927 }
928}
929
930/**
931 * nilfs_cpfile_get_stat - get checkpoint statistics
932 * @cpfile: inode of checkpoint file
933 * @cpstat: pointer to a structure of checkpoint statistics
934 *
935 * Description: nilfs_cpfile_get_stat() returns information about checkpoints.
936 *
937 * Return Value: On success, 0 is returned, and checkpoints information is
938 * stored in the place pointed by @cpstat. On error, one of the following
939 * negative error codes is returned.
940 *
941 * %-EIO - I/O error.
942 *
943 * %-ENOMEM - Insufficient amount of memory available.
944 */
945int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
946{
947 struct buffer_head *bh;
948 struct nilfs_cpfile_header *header;
949 void *kaddr;
950 int ret;
951
952 down_read(&NILFS_MDT(cpfile)->mi_sem);
953
954 ret = nilfs_cpfile_get_header_block(cpfile, &bh);
955 if (ret < 0)
956 goto out_sem;
957 kaddr = kmap_atomic(bh->b_page);
958 header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
959 cpstat->cs_cno = nilfs_mdt_cno(cpfile);
960 cpstat->cs_ncps = le64_to_cpu(header->ch_ncheckpoints);
961 cpstat->cs_nsss = le64_to_cpu(header->ch_nsnapshots);
962 kunmap_atomic(kaddr);
963 brelse(bh);
964
965 out_sem:
966 up_read(&NILFS_MDT(cpfile)->mi_sem);
967 return ret;
968}
969
970/**
971 * nilfs_cpfile_read - read or get cpfile inode
972 * @sb: super block instance
973 * @cpsize: size of a checkpoint entry
974 * @raw_inode: on-disk cpfile inode
975 * @inodep: buffer to store the inode
976 */
977int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
978 struct nilfs_inode *raw_inode, struct inode **inodep)
979{
980 struct inode *cpfile;
981 int err;
982
983 if (cpsize > sb->s_blocksize) {
984 nilfs_err(sb, "too large checkpoint size: %zu bytes", cpsize);
985 return -EINVAL;
986 } else if (cpsize < NILFS_MIN_CHECKPOINT_SIZE) {
987 nilfs_err(sb, "too small checkpoint size: %zu bytes", cpsize);
988 return -EINVAL;
989 }
990
991 cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO);
992 if (unlikely(!cpfile))
993 return -ENOMEM;
994 if (!(cpfile->i_state & I_NEW))
995 goto out;
996
997 err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0);
998 if (err)
999 goto failed;
1000
1001 nilfs_mdt_set_entry_size(cpfile, cpsize,
1002 sizeof(struct nilfs_cpfile_header));
1003
1004 err = nilfs_read_inode_common(cpfile, raw_inode);
1005 if (err)
1006 goto failed;
1007
1008 unlock_new_inode(cpfile);
1009 out:
1010 *inodep = cpfile;
1011 return 0;
1012 failed:
1013 iget_failed(cpfile);
1014 return err;
1015}
1/*
2 * cpfile.c - NILFS checkpoint file.
3 *
4 * Copyright (C) 2006-2008 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 Koji Sato <koji@osrg.net>.
21 */
22
23#include <linux/kernel.h>
24#include <linux/fs.h>
25#include <linux/string.h>
26#include <linux/buffer_head.h>
27#include <linux/errno.h>
28#include <linux/nilfs2_fs.h>
29#include "mdt.h"
30#include "cpfile.h"
31
32
33static inline unsigned long
34nilfs_cpfile_checkpoints_per_block(const struct inode *cpfile)
35{
36 return NILFS_MDT(cpfile)->mi_entries_per_block;
37}
38
39/* block number from the beginning of the file */
40static unsigned long
41nilfs_cpfile_get_blkoff(const struct inode *cpfile, __u64 cno)
42{
43 __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
44 do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile));
45 return (unsigned long)tcno;
46}
47
48/* offset in block */
49static unsigned long
50nilfs_cpfile_get_offset(const struct inode *cpfile, __u64 cno)
51{
52 __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
53 return do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile));
54}
55
56static unsigned long
57nilfs_cpfile_checkpoints_in_block(const struct inode *cpfile,
58 __u64 curr,
59 __u64 max)
60{
61 return min_t(__u64,
62 nilfs_cpfile_checkpoints_per_block(cpfile) -
63 nilfs_cpfile_get_offset(cpfile, curr),
64 max - curr);
65}
66
67static inline int nilfs_cpfile_is_in_first(const struct inode *cpfile,
68 __u64 cno)
69{
70 return nilfs_cpfile_get_blkoff(cpfile, cno) == 0;
71}
72
73static unsigned int
74nilfs_cpfile_block_add_valid_checkpoints(const struct inode *cpfile,
75 struct buffer_head *bh,
76 void *kaddr,
77 unsigned int n)
78{
79 struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
80 unsigned int count;
81
82 count = le32_to_cpu(cp->cp_checkpoints_count) + n;
83 cp->cp_checkpoints_count = cpu_to_le32(count);
84 return count;
85}
86
87static unsigned int
88nilfs_cpfile_block_sub_valid_checkpoints(const struct inode *cpfile,
89 struct buffer_head *bh,
90 void *kaddr,
91 unsigned int n)
92{
93 struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
94 unsigned int count;
95
96 WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n);
97 count = le32_to_cpu(cp->cp_checkpoints_count) - n;
98 cp->cp_checkpoints_count = cpu_to_le32(count);
99 return count;
100}
101
102static inline struct nilfs_cpfile_header *
103nilfs_cpfile_block_get_header(const struct inode *cpfile,
104 struct buffer_head *bh,
105 void *kaddr)
106{
107 return kaddr + bh_offset(bh);
108}
109
110static struct nilfs_checkpoint *
111nilfs_cpfile_block_get_checkpoint(const struct inode *cpfile, __u64 cno,
112 struct buffer_head *bh,
113 void *kaddr)
114{
115 return kaddr + bh_offset(bh) + nilfs_cpfile_get_offset(cpfile, cno) *
116 NILFS_MDT(cpfile)->mi_entry_size;
117}
118
119static void nilfs_cpfile_block_init(struct inode *cpfile,
120 struct buffer_head *bh,
121 void *kaddr)
122{
123 struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
124 size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
125 int n = nilfs_cpfile_checkpoints_per_block(cpfile);
126
127 while (n-- > 0) {
128 nilfs_checkpoint_set_invalid(cp);
129 cp = (void *)cp + cpsz;
130 }
131}
132
133static inline int nilfs_cpfile_get_header_block(struct inode *cpfile,
134 struct buffer_head **bhp)
135{
136 return nilfs_mdt_get_block(cpfile, 0, 0, NULL, bhp);
137}
138
139static inline int nilfs_cpfile_get_checkpoint_block(struct inode *cpfile,
140 __u64 cno,
141 int create,
142 struct buffer_head **bhp)
143{
144 return nilfs_mdt_get_block(cpfile,
145 nilfs_cpfile_get_blkoff(cpfile, cno),
146 create, nilfs_cpfile_block_init, bhp);
147}
148
149static inline int nilfs_cpfile_delete_checkpoint_block(struct inode *cpfile,
150 __u64 cno)
151{
152 return nilfs_mdt_delete_block(cpfile,
153 nilfs_cpfile_get_blkoff(cpfile, cno));
154}
155
156/**
157 * nilfs_cpfile_get_checkpoint - get a checkpoint
158 * @cpfile: inode of checkpoint file
159 * @cno: checkpoint number
160 * @create: create flag
161 * @cpp: pointer to a checkpoint
162 * @bhp: pointer to a buffer head
163 *
164 * Description: nilfs_cpfile_get_checkpoint() acquires the checkpoint
165 * specified by @cno. A new checkpoint will be created if @cno is the current
166 * checkpoint number and @create is nonzero.
167 *
168 * Return Value: On success, 0 is returned, and the checkpoint and the
169 * buffer head of the buffer on which the checkpoint is located are stored in
170 * the place pointed by @cpp and @bhp, respectively. On error, one of the
171 * following negative error codes is returned.
172 *
173 * %-EIO - I/O error.
174 *
175 * %-ENOMEM - Insufficient amount of memory available.
176 *
177 * %-ENOENT - No such checkpoint.
178 *
179 * %-EINVAL - invalid checkpoint.
180 */
181int nilfs_cpfile_get_checkpoint(struct inode *cpfile,
182 __u64 cno,
183 int create,
184 struct nilfs_checkpoint **cpp,
185 struct buffer_head **bhp)
186{
187 struct buffer_head *header_bh, *cp_bh;
188 struct nilfs_cpfile_header *header;
189 struct nilfs_checkpoint *cp;
190 void *kaddr;
191 int ret;
192
193 if (unlikely(cno < 1 || cno > nilfs_mdt_cno(cpfile) ||
194 (cno < nilfs_mdt_cno(cpfile) && create)))
195 return -EINVAL;
196
197 down_write(&NILFS_MDT(cpfile)->mi_sem);
198
199 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
200 if (ret < 0)
201 goto out_sem;
202 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, create, &cp_bh);
203 if (ret < 0)
204 goto out_header;
205 kaddr = kmap(cp_bh->b_page);
206 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
207 if (nilfs_checkpoint_invalid(cp)) {
208 if (!create) {
209 kunmap(cp_bh->b_page);
210 brelse(cp_bh);
211 ret = -ENOENT;
212 goto out_header;
213 }
214 /* a newly-created checkpoint */
215 nilfs_checkpoint_clear_invalid(cp);
216 if (!nilfs_cpfile_is_in_first(cpfile, cno))
217 nilfs_cpfile_block_add_valid_checkpoints(cpfile, cp_bh,
218 kaddr, 1);
219 mark_buffer_dirty(cp_bh);
220
221 kaddr = kmap_atomic(header_bh->b_page);
222 header = nilfs_cpfile_block_get_header(cpfile, header_bh,
223 kaddr);
224 le64_add_cpu(&header->ch_ncheckpoints, 1);
225 kunmap_atomic(kaddr);
226 mark_buffer_dirty(header_bh);
227 nilfs_mdt_mark_dirty(cpfile);
228 }
229
230 if (cpp != NULL)
231 *cpp = cp;
232 *bhp = cp_bh;
233
234 out_header:
235 brelse(header_bh);
236
237 out_sem:
238 up_write(&NILFS_MDT(cpfile)->mi_sem);
239 return ret;
240}
241
242/**
243 * nilfs_cpfile_put_checkpoint - put a checkpoint
244 * @cpfile: inode of checkpoint file
245 * @cno: checkpoint number
246 * @bh: buffer head
247 *
248 * Description: nilfs_cpfile_put_checkpoint() releases the checkpoint
249 * specified by @cno. @bh must be the buffer head which has been returned by
250 * a previous call to nilfs_cpfile_get_checkpoint() with @cno.
251 */
252void nilfs_cpfile_put_checkpoint(struct inode *cpfile, __u64 cno,
253 struct buffer_head *bh)
254{
255 kunmap(bh->b_page);
256 brelse(bh);
257}
258
259/**
260 * nilfs_cpfile_delete_checkpoints - delete checkpoints
261 * @cpfile: inode of checkpoint file
262 * @start: start checkpoint number
263 * @end: end checkpoint numer
264 *
265 * Description: nilfs_cpfile_delete_checkpoints() deletes the checkpoints in
266 * the period from @start to @end, excluding @end itself. The checkpoints
267 * which have been already deleted are ignored.
268 *
269 * Return Value: On success, 0 is returned. On error, one of the following
270 * negative error codes is returned.
271 *
272 * %-EIO - I/O error.
273 *
274 * %-ENOMEM - Insufficient amount of memory available.
275 *
276 * %-EINVAL - invalid checkpoints.
277 */
278int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
279 __u64 start,
280 __u64 end)
281{
282 struct buffer_head *header_bh, *cp_bh;
283 struct nilfs_cpfile_header *header;
284 struct nilfs_checkpoint *cp;
285 size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
286 __u64 cno;
287 void *kaddr;
288 unsigned long tnicps;
289 int ret, ncps, nicps, nss, count, i;
290
291 if (unlikely(start == 0 || start > end)) {
292 printk(KERN_ERR "%s: invalid range of checkpoint numbers: "
293 "[%llu, %llu)\n", __func__,
294 (unsigned long long)start, (unsigned long long)end);
295 return -EINVAL;
296 }
297
298 down_write(&NILFS_MDT(cpfile)->mi_sem);
299
300 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
301 if (ret < 0)
302 goto out_sem;
303 tnicps = 0;
304 nss = 0;
305
306 for (cno = start; cno < end; cno += ncps) {
307 ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, end);
308 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
309 if (ret < 0) {
310 if (ret != -ENOENT)
311 break;
312 /* skip hole */
313 ret = 0;
314 continue;
315 }
316
317 kaddr = kmap_atomic(cp_bh->b_page);
318 cp = nilfs_cpfile_block_get_checkpoint(
319 cpfile, cno, cp_bh, kaddr);
320 nicps = 0;
321 for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) {
322 if (nilfs_checkpoint_snapshot(cp)) {
323 nss++;
324 } else if (!nilfs_checkpoint_invalid(cp)) {
325 nilfs_checkpoint_set_invalid(cp);
326 nicps++;
327 }
328 }
329 if (nicps > 0) {
330 tnicps += nicps;
331 mark_buffer_dirty(cp_bh);
332 nilfs_mdt_mark_dirty(cpfile);
333 if (!nilfs_cpfile_is_in_first(cpfile, cno)) {
334 count =
335 nilfs_cpfile_block_sub_valid_checkpoints(
336 cpfile, cp_bh, kaddr, nicps);
337 if (count == 0) {
338 /* make hole */
339 kunmap_atomic(kaddr);
340 brelse(cp_bh);
341 ret =
342 nilfs_cpfile_delete_checkpoint_block(
343 cpfile, cno);
344 if (ret == 0)
345 continue;
346 printk(KERN_ERR
347 "%s: cannot delete block\n",
348 __func__);
349 break;
350 }
351 }
352 }
353
354 kunmap_atomic(kaddr);
355 brelse(cp_bh);
356 }
357
358 if (tnicps > 0) {
359 kaddr = kmap_atomic(header_bh->b_page);
360 header = nilfs_cpfile_block_get_header(cpfile, header_bh,
361 kaddr);
362 le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps);
363 mark_buffer_dirty(header_bh);
364 nilfs_mdt_mark_dirty(cpfile);
365 kunmap_atomic(kaddr);
366 }
367
368 brelse(header_bh);
369 if (nss > 0)
370 ret = -EBUSY;
371
372 out_sem:
373 up_write(&NILFS_MDT(cpfile)->mi_sem);
374 return ret;
375}
376
377static void nilfs_cpfile_checkpoint_to_cpinfo(struct inode *cpfile,
378 struct nilfs_checkpoint *cp,
379 struct nilfs_cpinfo *ci)
380{
381 ci->ci_flags = le32_to_cpu(cp->cp_flags);
382 ci->ci_cno = le64_to_cpu(cp->cp_cno);
383 ci->ci_create = le64_to_cpu(cp->cp_create);
384 ci->ci_nblk_inc = le64_to_cpu(cp->cp_nblk_inc);
385 ci->ci_inodes_count = le64_to_cpu(cp->cp_inodes_count);
386 ci->ci_blocks_count = le64_to_cpu(cp->cp_blocks_count);
387 ci->ci_next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
388}
389
390static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
391 void *buf, unsigned cisz, size_t nci)
392{
393 struct nilfs_checkpoint *cp;
394 struct nilfs_cpinfo *ci = buf;
395 struct buffer_head *bh;
396 size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
397 __u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop;
398 void *kaddr;
399 int n, ret;
400 int ncps, i;
401
402 if (cno == 0)
403 return -ENOENT; /* checkpoint number 0 is invalid */
404 down_read(&NILFS_MDT(cpfile)->mi_sem);
405
406 for (n = 0; cno < cur_cno && n < nci; cno += ncps) {
407 ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno);
408 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
409 if (ret < 0) {
410 if (ret != -ENOENT)
411 goto out;
412 continue; /* skip hole */
413 }
414
415 kaddr = kmap_atomic(bh->b_page);
416 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
417 for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) {
418 if (!nilfs_checkpoint_invalid(cp)) {
419 nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp,
420 ci);
421 ci = (void *)ci + cisz;
422 n++;
423 }
424 }
425 kunmap_atomic(kaddr);
426 brelse(bh);
427 }
428
429 ret = n;
430 if (n > 0) {
431 ci = (void *)ci - cisz;
432 *cnop = ci->ci_cno + 1;
433 }
434
435 out:
436 up_read(&NILFS_MDT(cpfile)->mi_sem);
437 return ret;
438}
439
440static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
441 void *buf, unsigned cisz, size_t nci)
442{
443 struct buffer_head *bh;
444 struct nilfs_cpfile_header *header;
445 struct nilfs_checkpoint *cp;
446 struct nilfs_cpinfo *ci = buf;
447 __u64 curr = *cnop, next;
448 unsigned long curr_blkoff, next_blkoff;
449 void *kaddr;
450 int n = 0, ret;
451
452 down_read(&NILFS_MDT(cpfile)->mi_sem);
453
454 if (curr == 0) {
455 ret = nilfs_cpfile_get_header_block(cpfile, &bh);
456 if (ret < 0)
457 goto out;
458 kaddr = kmap_atomic(bh->b_page);
459 header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
460 curr = le64_to_cpu(header->ch_snapshot_list.ssl_next);
461 kunmap_atomic(kaddr);
462 brelse(bh);
463 if (curr == 0) {
464 ret = 0;
465 goto out;
466 }
467 } else if (unlikely(curr == ~(__u64)0)) {
468 ret = 0;
469 goto out;
470 }
471
472 curr_blkoff = nilfs_cpfile_get_blkoff(cpfile, curr);
473 ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, 0, &bh);
474 if (unlikely(ret < 0)) {
475 if (ret == -ENOENT)
476 ret = 0; /* No snapshots (started from a hole block) */
477 goto out;
478 }
479 kaddr = kmap_atomic(bh->b_page);
480 while (n < nci) {
481 cp = nilfs_cpfile_block_get_checkpoint(cpfile, curr, bh, kaddr);
482 curr = ~(__u64)0; /* Terminator */
483 if (unlikely(nilfs_checkpoint_invalid(cp) ||
484 !nilfs_checkpoint_snapshot(cp)))
485 break;
486 nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, ci);
487 ci = (void *)ci + cisz;
488 n++;
489 next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
490 if (next == 0)
491 break; /* reach end of the snapshot list */
492
493 next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next);
494 if (curr_blkoff != next_blkoff) {
495 kunmap_atomic(kaddr);
496 brelse(bh);
497 ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
498 0, &bh);
499 if (unlikely(ret < 0)) {
500 WARN_ON(ret == -ENOENT);
501 goto out;
502 }
503 kaddr = kmap_atomic(bh->b_page);
504 }
505 curr = next;
506 curr_blkoff = next_blkoff;
507 }
508 kunmap_atomic(kaddr);
509 brelse(bh);
510 *cnop = curr;
511 ret = n;
512
513 out:
514 up_read(&NILFS_MDT(cpfile)->mi_sem);
515 return ret;
516}
517
518/**
519 * nilfs_cpfile_get_cpinfo -
520 * @cpfile:
521 * @cno:
522 * @ci:
523 * @nci:
524 */
525
526ssize_t nilfs_cpfile_get_cpinfo(struct inode *cpfile, __u64 *cnop, int mode,
527 void *buf, unsigned cisz, size_t nci)
528{
529 switch (mode) {
530 case NILFS_CHECKPOINT:
531 return nilfs_cpfile_do_get_cpinfo(cpfile, cnop, buf, cisz, nci);
532 case NILFS_SNAPSHOT:
533 return nilfs_cpfile_do_get_ssinfo(cpfile, cnop, buf, cisz, nci);
534 default:
535 return -EINVAL;
536 }
537}
538
539/**
540 * nilfs_cpfile_delete_checkpoint -
541 * @cpfile:
542 * @cno:
543 */
544int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
545{
546 struct nilfs_cpinfo ci;
547 __u64 tcno = cno;
548 ssize_t nci;
549
550 nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, sizeof(ci), 1);
551 if (nci < 0)
552 return nci;
553 else if (nci == 0 || ci.ci_cno != cno)
554 return -ENOENT;
555 else if (nilfs_cpinfo_snapshot(&ci))
556 return -EBUSY;
557
558 return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1);
559}
560
561static struct nilfs_snapshot_list *
562nilfs_cpfile_block_get_snapshot_list(const struct inode *cpfile,
563 __u64 cno,
564 struct buffer_head *bh,
565 void *kaddr)
566{
567 struct nilfs_cpfile_header *header;
568 struct nilfs_checkpoint *cp;
569 struct nilfs_snapshot_list *list;
570
571 if (cno != 0) {
572 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
573 list = &cp->cp_snapshot_list;
574 } else {
575 header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
576 list = &header->ch_snapshot_list;
577 }
578 return list;
579}
580
581static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
582{
583 struct buffer_head *header_bh, *curr_bh, *prev_bh, *cp_bh;
584 struct nilfs_cpfile_header *header;
585 struct nilfs_checkpoint *cp;
586 struct nilfs_snapshot_list *list;
587 __u64 curr, prev;
588 unsigned long curr_blkoff, prev_blkoff;
589 void *kaddr;
590 int ret;
591
592 if (cno == 0)
593 return -ENOENT; /* checkpoint number 0 is invalid */
594 down_write(&NILFS_MDT(cpfile)->mi_sem);
595
596 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
597 if (ret < 0)
598 goto out_sem;
599 kaddr = kmap_atomic(cp_bh->b_page);
600 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
601 if (nilfs_checkpoint_invalid(cp)) {
602 ret = -ENOENT;
603 kunmap_atomic(kaddr);
604 goto out_cp;
605 }
606 if (nilfs_checkpoint_snapshot(cp)) {
607 ret = 0;
608 kunmap_atomic(kaddr);
609 goto out_cp;
610 }
611 kunmap_atomic(kaddr);
612
613 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
614 if (ret < 0)
615 goto out_cp;
616 kaddr = kmap_atomic(header_bh->b_page);
617 header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
618 list = &header->ch_snapshot_list;
619 curr_bh = header_bh;
620 get_bh(curr_bh);
621 curr = 0;
622 curr_blkoff = 0;
623 prev = le64_to_cpu(list->ssl_prev);
624 while (prev > cno) {
625 prev_blkoff = nilfs_cpfile_get_blkoff(cpfile, prev);
626 curr = prev;
627 if (curr_blkoff != prev_blkoff) {
628 kunmap_atomic(kaddr);
629 brelse(curr_bh);
630 ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr,
631 0, &curr_bh);
632 if (ret < 0)
633 goto out_header;
634 kaddr = kmap_atomic(curr_bh->b_page);
635 }
636 curr_blkoff = prev_blkoff;
637 cp = nilfs_cpfile_block_get_checkpoint(
638 cpfile, curr, curr_bh, kaddr);
639 list = &cp->cp_snapshot_list;
640 prev = le64_to_cpu(list->ssl_prev);
641 }
642 kunmap_atomic(kaddr);
643
644 if (prev != 0) {
645 ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
646 &prev_bh);
647 if (ret < 0)
648 goto out_curr;
649 } else {
650 prev_bh = header_bh;
651 get_bh(prev_bh);
652 }
653
654 kaddr = kmap_atomic(curr_bh->b_page);
655 list = nilfs_cpfile_block_get_snapshot_list(
656 cpfile, curr, curr_bh, kaddr);
657 list->ssl_prev = cpu_to_le64(cno);
658 kunmap_atomic(kaddr);
659
660 kaddr = kmap_atomic(cp_bh->b_page);
661 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
662 cp->cp_snapshot_list.ssl_next = cpu_to_le64(curr);
663 cp->cp_snapshot_list.ssl_prev = cpu_to_le64(prev);
664 nilfs_checkpoint_set_snapshot(cp);
665 kunmap_atomic(kaddr);
666
667 kaddr = kmap_atomic(prev_bh->b_page);
668 list = nilfs_cpfile_block_get_snapshot_list(
669 cpfile, prev, prev_bh, kaddr);
670 list->ssl_next = cpu_to_le64(cno);
671 kunmap_atomic(kaddr);
672
673 kaddr = kmap_atomic(header_bh->b_page);
674 header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
675 le64_add_cpu(&header->ch_nsnapshots, 1);
676 kunmap_atomic(kaddr);
677
678 mark_buffer_dirty(prev_bh);
679 mark_buffer_dirty(curr_bh);
680 mark_buffer_dirty(cp_bh);
681 mark_buffer_dirty(header_bh);
682 nilfs_mdt_mark_dirty(cpfile);
683
684 brelse(prev_bh);
685
686 out_curr:
687 brelse(curr_bh);
688
689 out_header:
690 brelse(header_bh);
691
692 out_cp:
693 brelse(cp_bh);
694
695 out_sem:
696 up_write(&NILFS_MDT(cpfile)->mi_sem);
697 return ret;
698}
699
700static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno)
701{
702 struct buffer_head *header_bh, *next_bh, *prev_bh, *cp_bh;
703 struct nilfs_cpfile_header *header;
704 struct nilfs_checkpoint *cp;
705 struct nilfs_snapshot_list *list;
706 __u64 next, prev;
707 void *kaddr;
708 int ret;
709
710 if (cno == 0)
711 return -ENOENT; /* checkpoint number 0 is invalid */
712 down_write(&NILFS_MDT(cpfile)->mi_sem);
713
714 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
715 if (ret < 0)
716 goto out_sem;
717 kaddr = kmap_atomic(cp_bh->b_page);
718 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
719 if (nilfs_checkpoint_invalid(cp)) {
720 ret = -ENOENT;
721 kunmap_atomic(kaddr);
722 goto out_cp;
723 }
724 if (!nilfs_checkpoint_snapshot(cp)) {
725 ret = 0;
726 kunmap_atomic(kaddr);
727 goto out_cp;
728 }
729
730 list = &cp->cp_snapshot_list;
731 next = le64_to_cpu(list->ssl_next);
732 prev = le64_to_cpu(list->ssl_prev);
733 kunmap_atomic(kaddr);
734
735 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
736 if (ret < 0)
737 goto out_cp;
738 if (next != 0) {
739 ret = nilfs_cpfile_get_checkpoint_block(cpfile, next, 0,
740 &next_bh);
741 if (ret < 0)
742 goto out_header;
743 } else {
744 next_bh = header_bh;
745 get_bh(next_bh);
746 }
747 if (prev != 0) {
748 ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
749 &prev_bh);
750 if (ret < 0)
751 goto out_next;
752 } else {
753 prev_bh = header_bh;
754 get_bh(prev_bh);
755 }
756
757 kaddr = kmap_atomic(next_bh->b_page);
758 list = nilfs_cpfile_block_get_snapshot_list(
759 cpfile, next, next_bh, kaddr);
760 list->ssl_prev = cpu_to_le64(prev);
761 kunmap_atomic(kaddr);
762
763 kaddr = kmap_atomic(prev_bh->b_page);
764 list = nilfs_cpfile_block_get_snapshot_list(
765 cpfile, prev, prev_bh, kaddr);
766 list->ssl_next = cpu_to_le64(next);
767 kunmap_atomic(kaddr);
768
769 kaddr = kmap_atomic(cp_bh->b_page);
770 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
771 cp->cp_snapshot_list.ssl_next = cpu_to_le64(0);
772 cp->cp_snapshot_list.ssl_prev = cpu_to_le64(0);
773 nilfs_checkpoint_clear_snapshot(cp);
774 kunmap_atomic(kaddr);
775
776 kaddr = kmap_atomic(header_bh->b_page);
777 header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
778 le64_add_cpu(&header->ch_nsnapshots, -1);
779 kunmap_atomic(kaddr);
780
781 mark_buffer_dirty(next_bh);
782 mark_buffer_dirty(prev_bh);
783 mark_buffer_dirty(cp_bh);
784 mark_buffer_dirty(header_bh);
785 nilfs_mdt_mark_dirty(cpfile);
786
787 brelse(prev_bh);
788
789 out_next:
790 brelse(next_bh);
791
792 out_header:
793 brelse(header_bh);
794
795 out_cp:
796 brelse(cp_bh);
797
798 out_sem:
799 up_write(&NILFS_MDT(cpfile)->mi_sem);
800 return ret;
801}
802
803/**
804 * nilfs_cpfile_is_snapshot -
805 * @cpfile: inode of checkpoint file
806 * @cno: checkpoint number
807 *
808 * Description:
809 *
810 * Return Value: On success, 1 is returned if the checkpoint specified by
811 * @cno is a snapshot, or 0 if not. On error, one of the following negative
812 * error codes is returned.
813 *
814 * %-EIO - I/O error.
815 *
816 * %-ENOMEM - Insufficient amount of memory available.
817 *
818 * %-ENOENT - No such checkpoint.
819 */
820int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
821{
822 struct buffer_head *bh;
823 struct nilfs_checkpoint *cp;
824 void *kaddr;
825 int ret;
826
827 /* CP number is invalid if it's zero or larger than the
828 largest exist one.*/
829 if (cno == 0 || cno >= nilfs_mdt_cno(cpfile))
830 return -ENOENT;
831 down_read(&NILFS_MDT(cpfile)->mi_sem);
832
833 ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
834 if (ret < 0)
835 goto out;
836 kaddr = kmap_atomic(bh->b_page);
837 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
838 if (nilfs_checkpoint_invalid(cp))
839 ret = -ENOENT;
840 else
841 ret = nilfs_checkpoint_snapshot(cp);
842 kunmap_atomic(kaddr);
843 brelse(bh);
844
845 out:
846 up_read(&NILFS_MDT(cpfile)->mi_sem);
847 return ret;
848}
849
850/**
851 * nilfs_cpfile_change_cpmode - change checkpoint mode
852 * @cpfile: inode of checkpoint file
853 * @cno: checkpoint number
854 * @status: mode of checkpoint
855 *
856 * Description: nilfs_change_cpmode() changes the mode of the checkpoint
857 * specified by @cno. The mode @mode is NILFS_CHECKPOINT or NILFS_SNAPSHOT.
858 *
859 * Return Value: On success, 0 is returned. On error, one of the following
860 * negative error codes is returned.
861 *
862 * %-EIO - I/O error.
863 *
864 * %-ENOMEM - Insufficient amount of memory available.
865 *
866 * %-ENOENT - No such checkpoint.
867 */
868int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
869{
870 int ret;
871
872 switch (mode) {
873 case NILFS_CHECKPOINT:
874 if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno))
875 /*
876 * Current implementation does not have to protect
877 * plain read-only mounts since they are exclusive
878 * with a read/write mount and are protected from the
879 * cleaner.
880 */
881 ret = -EBUSY;
882 else
883 ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
884 return ret;
885 case NILFS_SNAPSHOT:
886 return nilfs_cpfile_set_snapshot(cpfile, cno);
887 default:
888 return -EINVAL;
889 }
890}
891
892/**
893 * nilfs_cpfile_get_stat - get checkpoint statistics
894 * @cpfile: inode of checkpoint file
895 * @stat: pointer to a structure of checkpoint statistics
896 *
897 * Description: nilfs_cpfile_get_stat() returns information about checkpoints.
898 *
899 * Return Value: On success, 0 is returned, and checkpoints information is
900 * stored in the place pointed by @stat. On error, one of the following
901 * negative error codes is returned.
902 *
903 * %-EIO - I/O error.
904 *
905 * %-ENOMEM - Insufficient amount of memory available.
906 */
907int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
908{
909 struct buffer_head *bh;
910 struct nilfs_cpfile_header *header;
911 void *kaddr;
912 int ret;
913
914 down_read(&NILFS_MDT(cpfile)->mi_sem);
915
916 ret = nilfs_cpfile_get_header_block(cpfile, &bh);
917 if (ret < 0)
918 goto out_sem;
919 kaddr = kmap_atomic(bh->b_page);
920 header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
921 cpstat->cs_cno = nilfs_mdt_cno(cpfile);
922 cpstat->cs_ncps = le64_to_cpu(header->ch_ncheckpoints);
923 cpstat->cs_nsss = le64_to_cpu(header->ch_nsnapshots);
924 kunmap_atomic(kaddr);
925 brelse(bh);
926
927 out_sem:
928 up_read(&NILFS_MDT(cpfile)->mi_sem);
929 return ret;
930}
931
932/**
933 * nilfs_cpfile_read - read or get cpfile inode
934 * @sb: super block instance
935 * @cpsize: size of a checkpoint entry
936 * @raw_inode: on-disk cpfile inode
937 * @inodep: buffer to store the inode
938 */
939int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
940 struct nilfs_inode *raw_inode, struct inode **inodep)
941{
942 struct inode *cpfile;
943 int err;
944
945 if (cpsize > sb->s_blocksize) {
946 printk(KERN_ERR
947 "NILFS: too large checkpoint size: %zu bytes.\n",
948 cpsize);
949 return -EINVAL;
950 } else if (cpsize < NILFS_MIN_CHECKPOINT_SIZE) {
951 printk(KERN_ERR
952 "NILFS: too small checkpoint size: %zu bytes.\n",
953 cpsize);
954 return -EINVAL;
955 }
956
957 cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO);
958 if (unlikely(!cpfile))
959 return -ENOMEM;
960 if (!(cpfile->i_state & I_NEW))
961 goto out;
962
963 err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0);
964 if (err)
965 goto failed;
966
967 nilfs_mdt_set_entry_size(cpfile, cpsize,
968 sizeof(struct nilfs_cpfile_header));
969
970 err = nilfs_read_inode_common(cpfile, raw_inode);
971 if (err)
972 goto failed;
973
974 unlock_new_inode(cpfile);
975 out:
976 *inodep = cpfile;
977 return 0;
978 failed:
979 iget_failed(cpfile);
980 return err;
981}