blob: 0d58075f34e29da6f666b008afdcaa74596b0255 [file] [log] [blame]
Koji Sato29619802009-04-06 19:01:31 -07001/*
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{
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -070043 __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
Koji Sato29619802009-04-06 19:01:31 -070044 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
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -070096 WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n);
Koji Sato29619802009-04-06 19:01:31 -070097 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.
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700178 *
179 * %-EINVAL - invalid checkpoint.
Koji Sato29619802009-04-06 19:01:31 -0700180 */
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
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700193 if (unlikely(cno < 1 || cno > nilfs_mdt_cno(cpfile) ||
194 (cno < nilfs_mdt_cno(cpfile) && create)))
195 return -EINVAL;
Koji Sato29619802009-04-06 19:01:31 -0700196
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);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900219 mark_buffer_dirty(cp_bh);
Koji Sato29619802009-04-06 19:01:31 -0700220
Cong Wang7b9c0972011-11-25 23:14:33 +0800221 kaddr = kmap_atomic(header_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700222 header = nilfs_cpfile_block_get_header(cpfile, header_bh,
223 kaddr);
224 le64_add_cpu(&header->ch_ncheckpoints, 1);
Cong Wang7b9c0972011-11-25 23:14:33 +0800225 kunmap_atomic(kaddr);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900226 mark_buffer_dirty(header_bh);
Koji Sato29619802009-04-06 19:01:31 -0700227 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;
Ryusuke Konishife0627e2012-07-30 14:42:05 -0700289 int ret, ncps, nicps, nss, count, i;
Koji Sato29619802009-04-06 19:01:31 -0700290
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700291 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;
Koji Sato29619802009-04-06 19:01:31 -0700296 }
297
Koji Sato29619802009-04-06 19:01:31 -0700298 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;
Ryusuke Konishife0627e2012-07-30 14:42:05 -0700304 nss = 0;
Koji Sato29619802009-04-06 19:01:31 -0700305
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)
Jiro SEKIBAd9a0a342009-07-04 23:00:53 +0900311 break;
Koji Sato29619802009-04-06 19:01:31 -0700312 /* skip hole */
313 ret = 0;
314 continue;
315 }
316
Cong Wang7b9c0972011-11-25 23:14:33 +0800317 kaddr = kmap_atomic(cp_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700318 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) {
Ryusuke Konishife0627e2012-07-30 14:42:05 -0700322 if (nilfs_checkpoint_snapshot(cp)) {
323 nss++;
324 } else if (!nilfs_checkpoint_invalid(cp)) {
Koji Sato29619802009-04-06 19:01:31 -0700325 nilfs_checkpoint_set_invalid(cp);
326 nicps++;
327 }
328 }
329 if (nicps > 0) {
330 tnicps += nicps;
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900331 mark_buffer_dirty(cp_bh);
Koji Sato29619802009-04-06 19:01:31 -0700332 nilfs_mdt_mark_dirty(cpfile);
Jiro SEKIBA5ee58142009-12-06 15:43:56 +0900333 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 */
Cong Wang7b9c0972011-11-25 23:14:33 +0800339 kunmap_atomic(kaddr);
Jiro SEKIBA5ee58142009-12-06 15:43:56 +0900340 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 }
Koji Sato29619802009-04-06 19:01:31 -0700351 }
352 }
353
Cong Wang7b9c0972011-11-25 23:14:33 +0800354 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700355 brelse(cp_bh);
356 }
357
358 if (tnicps > 0) {
Cong Wang7b9c0972011-11-25 23:14:33 +0800359 kaddr = kmap_atomic(header_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700360 header = nilfs_cpfile_block_get_header(cpfile, header_bh,
361 kaddr);
Koji Sato6c98cd42009-04-06 19:01:32 -0700362 le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900363 mark_buffer_dirty(header_bh);
Koji Sato29619802009-04-06 19:01:31 -0700364 nilfs_mdt_mark_dirty(cpfile);
Cong Wang7b9c0972011-11-25 23:14:33 +0800365 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700366 }
Ryusuke Konishi62013ab2009-05-30 21:50:58 +0900367
Koji Sato29619802009-04-06 19:01:31 -0700368 brelse(header_bh);
Ryusuke Konishife0627e2012-07-30 14:42:05 -0700369 if (nss > 0)
370 ret = -EBUSY;
Koji Sato29619802009-04-06 19:01:31 -0700371
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
Ryusuke Konishi76068c42009-04-06 19:01:50 -0700390static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900391 void *buf, unsigned cisz, size_t nci)
Koji Sato29619802009-04-06 19:01:31 -0700392{
393 struct nilfs_checkpoint *cp;
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900394 struct nilfs_cpinfo *ci = buf;
Koji Sato29619802009-04-06 19:01:31 -0700395 struct buffer_head *bh;
396 size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
Ryusuke Konishi76068c42009-04-06 19:01:50 -0700397 __u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop;
Koji Sato29619802009-04-06 19:01:31 -0700398 void *kaddr;
399 int n, ret;
400 int ncps, i;
401
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700402 if (cno == 0)
403 return -ENOENT; /* checkpoint number 0 is invalid */
Koji Sato29619802009-04-06 19:01:31 -0700404 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
Cong Wang7b9c0972011-11-25 23:14:33 +0800415 kaddr = kmap_atomic(bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700416 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
417 for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) {
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900418 if (!nilfs_checkpoint_invalid(cp)) {
419 nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp,
420 ci);
421 ci = (void *)ci + cisz;
422 n++;
423 }
Koji Sato29619802009-04-06 19:01:31 -0700424 }
Cong Wang7b9c0972011-11-25 23:14:33 +0800425 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700426 brelse(bh);
427 }
428
429 ret = n;
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900430 if (n > 0) {
431 ci = (void *)ci - cisz;
432 *cnop = ci->ci_cno + 1;
433 }
Koji Sato29619802009-04-06 19:01:31 -0700434
435 out:
436 up_read(&NILFS_MDT(cpfile)->mi_sem);
437 return ret;
438}
439
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700440static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900441 void *buf, unsigned cisz, size_t nci)
Koji Sato29619802009-04-06 19:01:31 -0700442{
443 struct buffer_head *bh;
444 struct nilfs_cpfile_header *header;
445 struct nilfs_checkpoint *cp;
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900446 struct nilfs_cpinfo *ci = buf;
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700447 __u64 curr = *cnop, next;
Koji Sato29619802009-04-06 19:01:31 -0700448 unsigned long curr_blkoff, next_blkoff;
449 void *kaddr;
Ryusuke Konishi7fa10d22009-04-06 19:01:48 -0700450 int n = 0, ret;
Koji Sato29619802009-04-06 19:01:31 -0700451
452 down_read(&NILFS_MDT(cpfile)->mi_sem);
453
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700454 if (curr == 0) {
Koji Sato29619802009-04-06 19:01:31 -0700455 ret = nilfs_cpfile_get_header_block(cpfile, &bh);
456 if (ret < 0)
457 goto out;
Cong Wang7b9c0972011-11-25 23:14:33 +0800458 kaddr = kmap_atomic(bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700459 header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
460 curr = le64_to_cpu(header->ch_snapshot_list.ssl_next);
Cong Wang7b9c0972011-11-25 23:14:33 +0800461 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700462 brelse(bh);
463 if (curr == 0) {
464 ret = 0;
465 goto out;
466 }
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700467 } else if (unlikely(curr == ~(__u64)0)) {
468 ret = 0;
469 goto out;
470 }
471
Koji Sato29619802009-04-06 19:01:31 -0700472 curr_blkoff = nilfs_cpfile_get_blkoff(cpfile, curr);
473 ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, 0, &bh);
Ryusuke Konishi7fa10d22009-04-06 19:01:48 -0700474 if (unlikely(ret < 0)) {
475 if (ret == -ENOENT)
476 ret = 0; /* No snapshots (started from a hole block) */
Koji Sato29619802009-04-06 19:01:31 -0700477 goto out;
Ryusuke Konishi7fa10d22009-04-06 19:01:48 -0700478 }
Cong Wang7b9c0972011-11-25 23:14:33 +0800479 kaddr = kmap_atomic(bh->b_page);
Ryusuke Konishi7fa10d22009-04-06 19:01:48 -0700480 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)))
Koji Sato29619802009-04-06 19:01:31 -0700485 break;
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900486 nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, ci);
487 ci = (void *)ci + cisz;
488 n++;
Ryusuke Konishi7fa10d22009-04-06 19:01:48 -0700489 next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
490 if (next == 0)
491 break; /* reach end of the snapshot list */
492
Koji Sato29619802009-04-06 19:01:31 -0700493 next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next);
494 if (curr_blkoff != next_blkoff) {
Cong Wang7b9c0972011-11-25 23:14:33 +0800495 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700496 brelse(bh);
497 ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
498 0, &bh);
Ryusuke Konishi7fa10d22009-04-06 19:01:48 -0700499 if (unlikely(ret < 0)) {
500 WARN_ON(ret == -ENOENT);
Koji Sato29619802009-04-06 19:01:31 -0700501 goto out;
Ryusuke Konishi7fa10d22009-04-06 19:01:48 -0700502 }
Cong Wang7b9c0972011-11-25 23:14:33 +0800503 kaddr = kmap_atomic(bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700504 }
505 curr = next;
506 curr_blkoff = next_blkoff;
507 }
Cong Wang7b9c0972011-11-25 23:14:33 +0800508 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700509 brelse(bh);
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700510 *cnop = curr;
Koji Sato29619802009-04-06 19:01:31 -0700511 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 */
Ryusuke Konishib028fcf2009-04-06 19:01:47 -0700525
526ssize_t nilfs_cpfile_get_cpinfo(struct inode *cpfile, __u64 *cnop, int mode,
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900527 void *buf, unsigned cisz, size_t nci)
Koji Sato29619802009-04-06 19:01:31 -0700528{
529 switch (mode) {
530 case NILFS_CHECKPOINT:
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900531 return nilfs_cpfile_do_get_cpinfo(cpfile, cnop, buf, cisz, nci);
Koji Sato29619802009-04-06 19:01:31 -0700532 case NILFS_SNAPSHOT:
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900533 return nilfs_cpfile_do_get_ssinfo(cpfile, cnop, buf, cisz, nci);
Koji Sato29619802009-04-06 19:01:31 -0700534 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;
Ryusuke Konishi76068c42009-04-06 19:01:50 -0700547 __u64 tcno = cno;
Koji Sato29619802009-04-06 19:01:31 -0700548 ssize_t nci;
Koji Sato29619802009-04-06 19:01:31 -0700549
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900550 nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, sizeof(ci), 1);
Koji Sato29619802009-04-06 19:01:31 -0700551 if (nci < 0)
552 return nci;
553 else if (nci == 0 || ci.ci_cno != cno)
554 return -ENOENT;
Ryusuke Konishi30c25be2009-05-30 19:08:09 +0900555 else if (nilfs_cpinfo_snapshot(&ci))
556 return -EBUSY;
Koji Sato29619802009-04-06 19:01:31 -0700557
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
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700592 if (cno == 0)
593 return -ENOENT; /* checkpoint number 0 is invalid */
Koji Sato29619802009-04-06 19:01:31 -0700594 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;
Cong Wang7b9c0972011-11-25 23:14:33 +0800599 kaddr = kmap_atomic(cp_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700600 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
601 if (nilfs_checkpoint_invalid(cp)) {
602 ret = -ENOENT;
Cong Wang7b9c0972011-11-25 23:14:33 +0800603 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700604 goto out_cp;
605 }
606 if (nilfs_checkpoint_snapshot(cp)) {
607 ret = 0;
Cong Wang7b9c0972011-11-25 23:14:33 +0800608 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700609 goto out_cp;
610 }
Cong Wang7b9c0972011-11-25 23:14:33 +0800611 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700612
613 ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
614 if (ret < 0)
615 goto out_cp;
Cong Wang7b9c0972011-11-25 23:14:33 +0800616 kaddr = kmap_atomic(header_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700617 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) {
Cong Wang7b9c0972011-11-25 23:14:33 +0800628 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700629 brelse(curr_bh);
630 ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr,
631 0, &curr_bh);
632 if (ret < 0)
633 goto out_header;
Cong Wang7b9c0972011-11-25 23:14:33 +0800634 kaddr = kmap_atomic(curr_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700635 }
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 }
Cong Wang7b9c0972011-11-25 23:14:33 +0800642 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700643
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
Cong Wang7b9c0972011-11-25 23:14:33 +0800654 kaddr = kmap_atomic(curr_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700655 list = nilfs_cpfile_block_get_snapshot_list(
656 cpfile, curr, curr_bh, kaddr);
657 list->ssl_prev = cpu_to_le64(cno);
Cong Wang7b9c0972011-11-25 23:14:33 +0800658 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700659
Cong Wang7b9c0972011-11-25 23:14:33 +0800660 kaddr = kmap_atomic(cp_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700661 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);
Cong Wang7b9c0972011-11-25 23:14:33 +0800665 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700666
Cong Wang7b9c0972011-11-25 23:14:33 +0800667 kaddr = kmap_atomic(prev_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700668 list = nilfs_cpfile_block_get_snapshot_list(
669 cpfile, prev, prev_bh, kaddr);
670 list->ssl_next = cpu_to_le64(cno);
Cong Wang7b9c0972011-11-25 23:14:33 +0800671 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700672
Cong Wang7b9c0972011-11-25 23:14:33 +0800673 kaddr = kmap_atomic(header_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700674 header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
675 le64_add_cpu(&header->ch_nsnapshots, 1);
Cong Wang7b9c0972011-11-25 23:14:33 +0800676 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700677
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900678 mark_buffer_dirty(prev_bh);
679 mark_buffer_dirty(curr_bh);
680 mark_buffer_dirty(cp_bh);
681 mark_buffer_dirty(header_bh);
Koji Sato29619802009-04-06 19:01:31 -0700682 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
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700710 if (cno == 0)
711 return -ENOENT; /* checkpoint number 0 is invalid */
Koji Sato29619802009-04-06 19:01:31 -0700712 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;
Cong Wang7b9c0972011-11-25 23:14:33 +0800717 kaddr = kmap_atomic(cp_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700718 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
719 if (nilfs_checkpoint_invalid(cp)) {
720 ret = -ENOENT;
Cong Wang7b9c0972011-11-25 23:14:33 +0800721 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700722 goto out_cp;
723 }
724 if (!nilfs_checkpoint_snapshot(cp)) {
725 ret = 0;
Cong Wang7b9c0972011-11-25 23:14:33 +0800726 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700727 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);
Cong Wang7b9c0972011-11-25 23:14:33 +0800733 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700734
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
Cong Wang7b9c0972011-11-25 23:14:33 +0800757 kaddr = kmap_atomic(next_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700758 list = nilfs_cpfile_block_get_snapshot_list(
759 cpfile, next, next_bh, kaddr);
760 list->ssl_prev = cpu_to_le64(prev);
Cong Wang7b9c0972011-11-25 23:14:33 +0800761 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700762
Cong Wang7b9c0972011-11-25 23:14:33 +0800763 kaddr = kmap_atomic(prev_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700764 list = nilfs_cpfile_block_get_snapshot_list(
765 cpfile, prev, prev_bh, kaddr);
766 list->ssl_next = cpu_to_le64(next);
Cong Wang7b9c0972011-11-25 23:14:33 +0800767 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700768
Cong Wang7b9c0972011-11-25 23:14:33 +0800769 kaddr = kmap_atomic(cp_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700770 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);
Cong Wang7b9c0972011-11-25 23:14:33 +0800774 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700775
Cong Wang7b9c0972011-11-25 23:14:33 +0800776 kaddr = kmap_atomic(header_bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700777 header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
778 le64_add_cpu(&header->ch_nsnapshots, -1);
Cong Wang7b9c0972011-11-25 23:14:33 +0800779 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700780
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900781 mark_buffer_dirty(next_bh);
782 mark_buffer_dirty(prev_bh);
783 mark_buffer_dirty(cp_bh);
784 mark_buffer_dirty(header_bh);
Koji Sato29619802009-04-06 19:01:31 -0700785 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
Zhu Yanhai43be0ec2009-08-12 14:17:59 +0800827 /* 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;
Koji Sato29619802009-04-06 19:01:31 -0700831 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;
Cong Wang7b9c0972011-11-25 23:14:33 +0800836 kaddr = kmap_atomic(bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700837 cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
Zhu Yanhai43be0ec2009-08-12 14:17:59 +0800838 if (nilfs_checkpoint_invalid(cp))
839 ret = -ENOENT;
840 else
841 ret = nilfs_checkpoint_snapshot(cp);
Cong Wang7b9c0972011-11-25 23:14:33 +0800842 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700843 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{
Koji Sato29619802009-04-06 19:01:31 -0700870 int ret;
871
Koji Sato29619802009-04-06 19:01:31 -0700872 switch (mode) {
873 case NILFS_CHECKPOINT:
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900874 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 */
Koji Sato29619802009-04-06 19:01:31 -0700881 ret = -EBUSY;
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900882 else
Koji Sato29619802009-04-06 19:01:31 -0700883 ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
Koji Sato29619802009-04-06 19:01:31 -0700884 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;
Cong Wang7b9c0972011-11-25 23:14:33 +0800919 kaddr = kmap_atomic(bh->b_page);
Koji Sato29619802009-04-06 19:01:31 -0700920 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);
Cong Wang7b9c0972011-11-25 23:14:33 +0800924 kunmap_atomic(kaddr);
Koji Sato29619802009-04-06 19:01:31 -0700925 brelse(bh);
926
927 out_sem:
928 up_read(&NILFS_MDT(cpfile)->mi_sem);
929 return ret;
930}
Ryusuke Konishi79739562009-11-12 23:56:43 +0900931
932/**
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900933 * nilfs_cpfile_read - read or get cpfile inode
934 * @sb: super block instance
Ryusuke Konishi79739562009-11-12 23:56:43 +0900935 * @cpsize: size of a checkpoint entry
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900936 * @raw_inode: on-disk cpfile inode
937 * @inodep: buffer to store the inode
Ryusuke Konishi79739562009-11-12 23:56:43 +0900938 */
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900939int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
940 struct nilfs_inode *raw_inode, struct inode **inodep)
Ryusuke Konishi79739562009-11-12 23:56:43 +0900941{
942 struct inode *cpfile;
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900943 int err;
Ryusuke Konishi79739562009-11-12 23:56:43 +0900944
Ryusuke Konishi0ec060d2014-04-03 14:50:31 -0700945 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
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900957 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;
Ryusuke Konishi79739562009-11-12 23:56:43 +0900981}