Commit | Line | Data |
---|---|---|
29619809 KS |
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 | ||
33 | static inline unsigned long | |
34 | nilfs_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 */ | |
40 | static unsigned long | |
41 | nilfs_cpfile_get_blkoff(const struct inode *cpfile, __u64 cno) | |
42 | { | |
1f5abe7e | 43 | __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1; |
29619809 KS |
44 | do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile)); |
45 | return (unsigned long)tcno; | |
46 | } | |
47 | ||
48 | /* offset in block */ | |
49 | static unsigned long | |
50 | nilfs_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 | ||
53a2c3bd RK |
56 | static __u64 nilfs_cpfile_first_checkpoint_in_block(const struct inode *cpfile, |
57 | unsigned long blkoff) | |
58 | { | |
59 | return (__u64)nilfs_cpfile_checkpoints_per_block(cpfile) * blkoff | |
60 | + 1 - NILFS_MDT(cpfile)->mi_first_entry_offset; | |
61 | } | |
62 | ||
29619809 KS |
63 | static unsigned long |
64 | nilfs_cpfile_checkpoints_in_block(const struct inode *cpfile, | |
65 | __u64 curr, | |
66 | __u64 max) | |
67 | { | |
68 | return min_t(__u64, | |
69 | nilfs_cpfile_checkpoints_per_block(cpfile) - | |
70 | nilfs_cpfile_get_offset(cpfile, curr), | |
71 | max - curr); | |
72 | } | |
73 | ||
74 | static inline int nilfs_cpfile_is_in_first(const struct inode *cpfile, | |
75 | __u64 cno) | |
76 | { | |
77 | return nilfs_cpfile_get_blkoff(cpfile, cno) == 0; | |
78 | } | |
79 | ||
80 | static unsigned int | |
81 | nilfs_cpfile_block_add_valid_checkpoints(const struct inode *cpfile, | |
82 | struct buffer_head *bh, | |
83 | void *kaddr, | |
84 | unsigned int n) | |
85 | { | |
86 | struct nilfs_checkpoint *cp = kaddr + bh_offset(bh); | |
87 | unsigned int count; | |
88 | ||
89 | count = le32_to_cpu(cp->cp_checkpoints_count) + n; | |
90 | cp->cp_checkpoints_count = cpu_to_le32(count); | |
91 | return count; | |
92 | } | |
93 | ||
94 | static unsigned int | |
95 | nilfs_cpfile_block_sub_valid_checkpoints(const struct inode *cpfile, | |
96 | struct buffer_head *bh, | |
97 | void *kaddr, | |
98 | unsigned int n) | |
99 | { | |
100 | struct nilfs_checkpoint *cp = kaddr + bh_offset(bh); | |
101 | unsigned int count; | |
102 | ||
1f5abe7e | 103 | WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n); |
29619809 KS |
104 | count = le32_to_cpu(cp->cp_checkpoints_count) - n; |
105 | cp->cp_checkpoints_count = cpu_to_le32(count); | |
106 | return count; | |
107 | } | |
108 | ||
109 | static inline struct nilfs_cpfile_header * | |
110 | nilfs_cpfile_block_get_header(const struct inode *cpfile, | |
111 | struct buffer_head *bh, | |
112 | void *kaddr) | |
113 | { | |
114 | return kaddr + bh_offset(bh); | |
115 | } | |
116 | ||
117 | static struct nilfs_checkpoint * | |
118 | nilfs_cpfile_block_get_checkpoint(const struct inode *cpfile, __u64 cno, | |
119 | struct buffer_head *bh, | |
120 | void *kaddr) | |
121 | { | |
122 | return kaddr + bh_offset(bh) + nilfs_cpfile_get_offset(cpfile, cno) * | |
123 | NILFS_MDT(cpfile)->mi_entry_size; | |
124 | } | |
125 | ||
126 | static void nilfs_cpfile_block_init(struct inode *cpfile, | |
127 | struct buffer_head *bh, | |
128 | void *kaddr) | |
129 | { | |
130 | struct nilfs_checkpoint *cp = kaddr + bh_offset(bh); | |
131 | size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size; | |
132 | int n = nilfs_cpfile_checkpoints_per_block(cpfile); | |
133 | ||
134 | while (n-- > 0) { | |
135 | nilfs_checkpoint_set_invalid(cp); | |
136 | cp = (void *)cp + cpsz; | |
137 | } | |
138 | } | |
139 | ||
140 | static inline int nilfs_cpfile_get_header_block(struct inode *cpfile, | |
141 | struct buffer_head **bhp) | |
142 | { | |
143 | return nilfs_mdt_get_block(cpfile, 0, 0, NULL, bhp); | |
144 | } | |
145 | ||
146 | static inline int nilfs_cpfile_get_checkpoint_block(struct inode *cpfile, | |
147 | __u64 cno, | |
148 | int create, | |
149 | struct buffer_head **bhp) | |
150 | { | |
151 | return nilfs_mdt_get_block(cpfile, | |
152 | nilfs_cpfile_get_blkoff(cpfile, cno), | |
153 | create, nilfs_cpfile_block_init, bhp); | |
154 | } | |
155 | ||
53a2c3bd RK |
156 | /** |
157 | * nilfs_cpfile_find_checkpoint_block - find and get a buffer on cpfile | |
158 | * @cpfile: inode of cpfile | |
159 | * @start_cno: start checkpoint number (inclusive) | |
160 | * @end_cno: end checkpoint number (inclusive) | |
161 | * @cnop: place to store the next checkpoint number | |
162 | * @bhp: place to store a pointer to buffer_head struct | |
163 | * | |
164 | * Return Value: On success, it returns 0. On error, the following negative | |
165 | * error code is returned. | |
166 | * | |
167 | * %-ENOMEM - Insufficient memory available. | |
168 | * | |
169 | * %-EIO - I/O error | |
170 | * | |
171 | * %-ENOENT - no block exists in the range. | |
172 | */ | |
173 | static int nilfs_cpfile_find_checkpoint_block(struct inode *cpfile, | |
174 | __u64 start_cno, __u64 end_cno, | |
175 | __u64 *cnop, | |
176 | struct buffer_head **bhp) | |
177 | { | |
178 | unsigned long start, end, blkoff; | |
179 | int ret; | |
180 | ||
181 | if (unlikely(start_cno > end_cno)) | |
182 | return -ENOENT; | |
183 | ||
184 | start = nilfs_cpfile_get_blkoff(cpfile, start_cno); | |
185 | end = nilfs_cpfile_get_blkoff(cpfile, end_cno); | |
186 | ||
187 | ret = nilfs_mdt_find_block(cpfile, start, end, &blkoff, bhp); | |
188 | if (!ret) | |
189 | *cnop = (blkoff == start) ? start_cno : | |
190 | nilfs_cpfile_first_checkpoint_in_block(cpfile, blkoff); | |
191 | return ret; | |
192 | } | |
193 | ||
29619809 KS |
194 | static inline int nilfs_cpfile_delete_checkpoint_block(struct inode *cpfile, |
195 | __u64 cno) | |
196 | { | |
197 | return nilfs_mdt_delete_block(cpfile, | |
198 | nilfs_cpfile_get_blkoff(cpfile, cno)); | |
199 | } | |
200 | ||
201 | /** | |
202 | * nilfs_cpfile_get_checkpoint - get a checkpoint | |
203 | * @cpfile: inode of checkpoint file | |
204 | * @cno: checkpoint number | |
205 | * @create: create flag | |
206 | * @cpp: pointer to a checkpoint | |
207 | * @bhp: pointer to a buffer head | |
208 | * | |
209 | * Description: nilfs_cpfile_get_checkpoint() acquires the checkpoint | |
210 | * specified by @cno. A new checkpoint will be created if @cno is the current | |
211 | * checkpoint number and @create is nonzero. | |
212 | * | |
213 | * Return Value: On success, 0 is returned, and the checkpoint and the | |
214 | * buffer head of the buffer on which the checkpoint is located are stored in | |
215 | * the place pointed by @cpp and @bhp, respectively. On error, one of the | |
216 | * following negative error codes is returned. | |
217 | * | |
218 | * %-EIO - I/O error. | |
219 | * | |
220 | * %-ENOMEM - Insufficient amount of memory available. | |
221 | * | |
222 | * %-ENOENT - No such checkpoint. | |
1f5abe7e RK |
223 | * |
224 | * %-EINVAL - invalid checkpoint. | |
29619809 KS |
225 | */ |
226 | int nilfs_cpfile_get_checkpoint(struct inode *cpfile, | |
227 | __u64 cno, | |
228 | int create, | |
229 | struct nilfs_checkpoint **cpp, | |
230 | struct buffer_head **bhp) | |
231 | { | |
232 | struct buffer_head *header_bh, *cp_bh; | |
233 | struct nilfs_cpfile_header *header; | |
234 | struct nilfs_checkpoint *cp; | |
235 | void *kaddr; | |
236 | int ret; | |
237 | ||
1f5abe7e RK |
238 | if (unlikely(cno < 1 || cno > nilfs_mdt_cno(cpfile) || |
239 | (cno < nilfs_mdt_cno(cpfile) && create))) | |
240 | return -EINVAL; | |
29619809 KS |
241 | |
242 | down_write(&NILFS_MDT(cpfile)->mi_sem); | |
243 | ||
244 | ret = nilfs_cpfile_get_header_block(cpfile, &header_bh); | |
245 | if (ret < 0) | |
246 | goto out_sem; | |
247 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, create, &cp_bh); | |
248 | if (ret < 0) | |
249 | goto out_header; | |
250 | kaddr = kmap(cp_bh->b_page); | |
251 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); | |
252 | if (nilfs_checkpoint_invalid(cp)) { | |
253 | if (!create) { | |
254 | kunmap(cp_bh->b_page); | |
255 | brelse(cp_bh); | |
256 | ret = -ENOENT; | |
257 | goto out_header; | |
258 | } | |
259 | /* a newly-created checkpoint */ | |
260 | nilfs_checkpoint_clear_invalid(cp); | |
261 | if (!nilfs_cpfile_is_in_first(cpfile, cno)) | |
262 | nilfs_cpfile_block_add_valid_checkpoints(cpfile, cp_bh, | |
263 | kaddr, 1); | |
5fc7b141 | 264 | mark_buffer_dirty(cp_bh); |
29619809 | 265 | |
7b9c0976 | 266 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
267 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, |
268 | kaddr); | |
269 | le64_add_cpu(&header->ch_ncheckpoints, 1); | |
7b9c0976 | 270 | kunmap_atomic(kaddr); |
5fc7b141 | 271 | mark_buffer_dirty(header_bh); |
29619809 KS |
272 | nilfs_mdt_mark_dirty(cpfile); |
273 | } | |
274 | ||
275 | if (cpp != NULL) | |
276 | *cpp = cp; | |
277 | *bhp = cp_bh; | |
278 | ||
279 | out_header: | |
280 | brelse(header_bh); | |
281 | ||
282 | out_sem: | |
283 | up_write(&NILFS_MDT(cpfile)->mi_sem); | |
284 | return ret; | |
285 | } | |
286 | ||
287 | /** | |
288 | * nilfs_cpfile_put_checkpoint - put a checkpoint | |
289 | * @cpfile: inode of checkpoint file | |
290 | * @cno: checkpoint number | |
291 | * @bh: buffer head | |
292 | * | |
293 | * Description: nilfs_cpfile_put_checkpoint() releases the checkpoint | |
294 | * specified by @cno. @bh must be the buffer head which has been returned by | |
295 | * a previous call to nilfs_cpfile_get_checkpoint() with @cno. | |
296 | */ | |
297 | void nilfs_cpfile_put_checkpoint(struct inode *cpfile, __u64 cno, | |
298 | struct buffer_head *bh) | |
299 | { | |
300 | kunmap(bh->b_page); | |
301 | brelse(bh); | |
302 | } | |
303 | ||
304 | /** | |
305 | * nilfs_cpfile_delete_checkpoints - delete checkpoints | |
306 | * @cpfile: inode of checkpoint file | |
307 | * @start: start checkpoint number | |
308 | * @end: end checkpoint numer | |
309 | * | |
310 | * Description: nilfs_cpfile_delete_checkpoints() deletes the checkpoints in | |
311 | * the period from @start to @end, excluding @end itself. The checkpoints | |
312 | * which have been already deleted are ignored. | |
313 | * | |
314 | * Return Value: On success, 0 is returned. On error, one of the following | |
315 | * negative error codes is returned. | |
316 | * | |
317 | * %-EIO - I/O error. | |
318 | * | |
319 | * %-ENOMEM - Insufficient amount of memory available. | |
320 | * | |
321 | * %-EINVAL - invalid checkpoints. | |
322 | */ | |
323 | int nilfs_cpfile_delete_checkpoints(struct inode *cpfile, | |
324 | __u64 start, | |
325 | __u64 end) | |
326 | { | |
327 | struct buffer_head *header_bh, *cp_bh; | |
328 | struct nilfs_cpfile_header *header; | |
329 | struct nilfs_checkpoint *cp; | |
330 | size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size; | |
331 | __u64 cno; | |
332 | void *kaddr; | |
333 | unsigned long tnicps; | |
fe0627e7 | 334 | int ret, ncps, nicps, nss, count, i; |
29619809 | 335 | |
1f5abe7e RK |
336 | if (unlikely(start == 0 || start > end)) { |
337 | printk(KERN_ERR "%s: invalid range of checkpoint numbers: " | |
338 | "[%llu, %llu)\n", __func__, | |
339 | (unsigned long long)start, (unsigned long long)end); | |
340 | return -EINVAL; | |
29619809 KS |
341 | } |
342 | ||
29619809 KS |
343 | down_write(&NILFS_MDT(cpfile)->mi_sem); |
344 | ||
345 | ret = nilfs_cpfile_get_header_block(cpfile, &header_bh); | |
346 | if (ret < 0) | |
347 | goto out_sem; | |
348 | tnicps = 0; | |
fe0627e7 | 349 | nss = 0; |
29619809 KS |
350 | |
351 | for (cno = start; cno < end; cno += ncps) { | |
352 | ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, end); | |
353 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh); | |
354 | if (ret < 0) { | |
355 | if (ret != -ENOENT) | |
d9a0a345 | 356 | break; |
29619809 KS |
357 | /* skip hole */ |
358 | ret = 0; | |
359 | continue; | |
360 | } | |
361 | ||
7b9c0976 | 362 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
363 | cp = nilfs_cpfile_block_get_checkpoint( |
364 | cpfile, cno, cp_bh, kaddr); | |
365 | nicps = 0; | |
366 | for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) { | |
fe0627e7 RK |
367 | if (nilfs_checkpoint_snapshot(cp)) { |
368 | nss++; | |
369 | } else if (!nilfs_checkpoint_invalid(cp)) { | |
29619809 KS |
370 | nilfs_checkpoint_set_invalid(cp); |
371 | nicps++; | |
372 | } | |
373 | } | |
374 | if (nicps > 0) { | |
375 | tnicps += nicps; | |
5fc7b141 | 376 | mark_buffer_dirty(cp_bh); |
29619809 | 377 | nilfs_mdt_mark_dirty(cpfile); |
5ee58148 JS |
378 | if (!nilfs_cpfile_is_in_first(cpfile, cno)) { |
379 | count = | |
380 | nilfs_cpfile_block_sub_valid_checkpoints( | |
381 | cpfile, cp_bh, kaddr, nicps); | |
382 | if (count == 0) { | |
383 | /* make hole */ | |
7b9c0976 | 384 | kunmap_atomic(kaddr); |
5ee58148 JS |
385 | brelse(cp_bh); |
386 | ret = | |
387 | nilfs_cpfile_delete_checkpoint_block( | |
388 | cpfile, cno); | |
389 | if (ret == 0) | |
390 | continue; | |
391 | printk(KERN_ERR | |
392 | "%s: cannot delete block\n", | |
393 | __func__); | |
394 | break; | |
395 | } | |
29619809 KS |
396 | } |
397 | } | |
398 | ||
7b9c0976 | 399 | kunmap_atomic(kaddr); |
29619809 KS |
400 | brelse(cp_bh); |
401 | } | |
402 | ||
403 | if (tnicps > 0) { | |
7b9c0976 | 404 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
405 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, |
406 | kaddr); | |
6c98cd4e | 407 | le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps); |
5fc7b141 | 408 | mark_buffer_dirty(header_bh); |
29619809 | 409 | nilfs_mdt_mark_dirty(cpfile); |
7b9c0976 | 410 | kunmap_atomic(kaddr); |
29619809 | 411 | } |
62013ab5 | 412 | |
29619809 | 413 | brelse(header_bh); |
fe0627e7 RK |
414 | if (nss > 0) |
415 | ret = -EBUSY; | |
29619809 KS |
416 | |
417 | out_sem: | |
418 | up_write(&NILFS_MDT(cpfile)->mi_sem); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | static void nilfs_cpfile_checkpoint_to_cpinfo(struct inode *cpfile, | |
423 | struct nilfs_checkpoint *cp, | |
424 | struct nilfs_cpinfo *ci) | |
425 | { | |
426 | ci->ci_flags = le32_to_cpu(cp->cp_flags); | |
427 | ci->ci_cno = le64_to_cpu(cp->cp_cno); | |
428 | ci->ci_create = le64_to_cpu(cp->cp_create); | |
429 | ci->ci_nblk_inc = le64_to_cpu(cp->cp_nblk_inc); | |
430 | ci->ci_inodes_count = le64_to_cpu(cp->cp_inodes_count); | |
431 | ci->ci_blocks_count = le64_to_cpu(cp->cp_blocks_count); | |
432 | ci->ci_next = le64_to_cpu(cp->cp_snapshot_list.ssl_next); | |
433 | } | |
434 | ||
76068c4f | 435 | static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop, |
003ff182 | 436 | void *buf, unsigned cisz, size_t nci) |
29619809 KS |
437 | { |
438 | struct nilfs_checkpoint *cp; | |
003ff182 | 439 | struct nilfs_cpinfo *ci = buf; |
29619809 KS |
440 | struct buffer_head *bh; |
441 | size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size; | |
76068c4f | 442 | __u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop; |
29619809 KS |
443 | void *kaddr; |
444 | int n, ret; | |
445 | int ncps, i; | |
446 | ||
1f5abe7e RK |
447 | if (cno == 0) |
448 | return -ENOENT; /* checkpoint number 0 is invalid */ | |
29619809 KS |
449 | down_read(&NILFS_MDT(cpfile)->mi_sem); |
450 | ||
53a2c3bd RK |
451 | for (n = 0; n < nci; cno += ncps) { |
452 | ret = nilfs_cpfile_find_checkpoint_block( | |
453 | cpfile, cno, cur_cno - 1, &cno, &bh); | |
29619809 | 454 | if (ret < 0) { |
53a2c3bd RK |
455 | if (likely(ret == -ENOENT)) |
456 | break; | |
457 | goto out; | |
29619809 | 458 | } |
53a2c3bd | 459 | ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno); |
29619809 | 460 | |
7b9c0976 | 461 | kaddr = kmap_atomic(bh->b_page); |
29619809 KS |
462 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr); |
463 | for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) { | |
003ff182 RK |
464 | if (!nilfs_checkpoint_invalid(cp)) { |
465 | nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, | |
466 | ci); | |
467 | ci = (void *)ci + cisz; | |
468 | n++; | |
469 | } | |
29619809 | 470 | } |
7b9c0976 | 471 | kunmap_atomic(kaddr); |
29619809 KS |
472 | brelse(bh); |
473 | } | |
474 | ||
475 | ret = n; | |
003ff182 RK |
476 | if (n > 0) { |
477 | ci = (void *)ci - cisz; | |
478 | *cnop = ci->ci_cno + 1; | |
479 | } | |
29619809 KS |
480 | |
481 | out: | |
482 | up_read(&NILFS_MDT(cpfile)->mi_sem); | |
483 | return ret; | |
484 | } | |
485 | ||
b028fcfc | 486 | static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop, |
003ff182 | 487 | void *buf, unsigned cisz, size_t nci) |
29619809 KS |
488 | { |
489 | struct buffer_head *bh; | |
490 | struct nilfs_cpfile_header *header; | |
491 | struct nilfs_checkpoint *cp; | |
003ff182 | 492 | struct nilfs_cpinfo *ci = buf; |
b028fcfc | 493 | __u64 curr = *cnop, next; |
29619809 KS |
494 | unsigned long curr_blkoff, next_blkoff; |
495 | void *kaddr; | |
7fa10d20 | 496 | int n = 0, ret; |
29619809 KS |
497 | |
498 | down_read(&NILFS_MDT(cpfile)->mi_sem); | |
499 | ||
b028fcfc | 500 | if (curr == 0) { |
29619809 KS |
501 | ret = nilfs_cpfile_get_header_block(cpfile, &bh); |
502 | if (ret < 0) | |
503 | goto out; | |
7b9c0976 | 504 | kaddr = kmap_atomic(bh->b_page); |
29619809 KS |
505 | header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr); |
506 | curr = le64_to_cpu(header->ch_snapshot_list.ssl_next); | |
7b9c0976 | 507 | kunmap_atomic(kaddr); |
29619809 KS |
508 | brelse(bh); |
509 | if (curr == 0) { | |
510 | ret = 0; | |
511 | goto out; | |
512 | } | |
b028fcfc RK |
513 | } else if (unlikely(curr == ~(__u64)0)) { |
514 | ret = 0; | |
515 | goto out; | |
516 | } | |
517 | ||
29619809 KS |
518 | curr_blkoff = nilfs_cpfile_get_blkoff(cpfile, curr); |
519 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, 0, &bh); | |
7fa10d20 RK |
520 | if (unlikely(ret < 0)) { |
521 | if (ret == -ENOENT) | |
522 | ret = 0; /* No snapshots (started from a hole block) */ | |
29619809 | 523 | goto out; |
7fa10d20 | 524 | } |
7b9c0976 | 525 | kaddr = kmap_atomic(bh->b_page); |
7fa10d20 RK |
526 | while (n < nci) { |
527 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, curr, bh, kaddr); | |
528 | curr = ~(__u64)0; /* Terminator */ | |
529 | if (unlikely(nilfs_checkpoint_invalid(cp) || | |
530 | !nilfs_checkpoint_snapshot(cp))) | |
29619809 | 531 | break; |
003ff182 RK |
532 | nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, ci); |
533 | ci = (void *)ci + cisz; | |
534 | n++; | |
7fa10d20 RK |
535 | next = le64_to_cpu(cp->cp_snapshot_list.ssl_next); |
536 | if (next == 0) | |
537 | break; /* reach end of the snapshot list */ | |
538 | ||
29619809 KS |
539 | next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next); |
540 | if (curr_blkoff != next_blkoff) { | |
7b9c0976 | 541 | kunmap_atomic(kaddr); |
29619809 KS |
542 | brelse(bh); |
543 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, next, | |
544 | 0, &bh); | |
7fa10d20 RK |
545 | if (unlikely(ret < 0)) { |
546 | WARN_ON(ret == -ENOENT); | |
29619809 | 547 | goto out; |
7fa10d20 | 548 | } |
7b9c0976 | 549 | kaddr = kmap_atomic(bh->b_page); |
29619809 KS |
550 | } |
551 | curr = next; | |
552 | curr_blkoff = next_blkoff; | |
553 | } | |
7b9c0976 | 554 | kunmap_atomic(kaddr); |
29619809 | 555 | brelse(bh); |
b028fcfc | 556 | *cnop = curr; |
29619809 KS |
557 | ret = n; |
558 | ||
559 | out: | |
560 | up_read(&NILFS_MDT(cpfile)->mi_sem); | |
561 | return ret; | |
562 | } | |
563 | ||
564 | /** | |
565 | * nilfs_cpfile_get_cpinfo - | |
566 | * @cpfile: | |
567 | * @cno: | |
568 | * @ci: | |
569 | * @nci: | |
570 | */ | |
b028fcfc RK |
571 | |
572 | ssize_t nilfs_cpfile_get_cpinfo(struct inode *cpfile, __u64 *cnop, int mode, | |
003ff182 | 573 | void *buf, unsigned cisz, size_t nci) |
29619809 KS |
574 | { |
575 | switch (mode) { | |
576 | case NILFS_CHECKPOINT: | |
003ff182 | 577 | return nilfs_cpfile_do_get_cpinfo(cpfile, cnop, buf, cisz, nci); |
29619809 | 578 | case NILFS_SNAPSHOT: |
003ff182 | 579 | return nilfs_cpfile_do_get_ssinfo(cpfile, cnop, buf, cisz, nci); |
29619809 KS |
580 | default: |
581 | return -EINVAL; | |
582 | } | |
583 | } | |
584 | ||
585 | /** | |
586 | * nilfs_cpfile_delete_checkpoint - | |
587 | * @cpfile: | |
588 | * @cno: | |
589 | */ | |
590 | int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno) | |
591 | { | |
592 | struct nilfs_cpinfo ci; | |
76068c4f | 593 | __u64 tcno = cno; |
29619809 | 594 | ssize_t nci; |
29619809 | 595 | |
003ff182 | 596 | nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, sizeof(ci), 1); |
29619809 KS |
597 | if (nci < 0) |
598 | return nci; | |
599 | else if (nci == 0 || ci.ci_cno != cno) | |
600 | return -ENOENT; | |
30c25be7 RK |
601 | else if (nilfs_cpinfo_snapshot(&ci)) |
602 | return -EBUSY; | |
29619809 KS |
603 | |
604 | return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1); | |
605 | } | |
606 | ||
607 | static struct nilfs_snapshot_list * | |
608 | nilfs_cpfile_block_get_snapshot_list(const struct inode *cpfile, | |
609 | __u64 cno, | |
610 | struct buffer_head *bh, | |
611 | void *kaddr) | |
612 | { | |
613 | struct nilfs_cpfile_header *header; | |
614 | struct nilfs_checkpoint *cp; | |
615 | struct nilfs_snapshot_list *list; | |
616 | ||
617 | if (cno != 0) { | |
618 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr); | |
619 | list = &cp->cp_snapshot_list; | |
620 | } else { | |
621 | header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr); | |
622 | list = &header->ch_snapshot_list; | |
623 | } | |
624 | return list; | |
625 | } | |
626 | ||
627 | static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno) | |
628 | { | |
629 | struct buffer_head *header_bh, *curr_bh, *prev_bh, *cp_bh; | |
630 | struct nilfs_cpfile_header *header; | |
631 | struct nilfs_checkpoint *cp; | |
632 | struct nilfs_snapshot_list *list; | |
633 | __u64 curr, prev; | |
634 | unsigned long curr_blkoff, prev_blkoff; | |
635 | void *kaddr; | |
636 | int ret; | |
637 | ||
1f5abe7e RK |
638 | if (cno == 0) |
639 | return -ENOENT; /* checkpoint number 0 is invalid */ | |
29619809 KS |
640 | down_write(&NILFS_MDT(cpfile)->mi_sem); |
641 | ||
642 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh); | |
643 | if (ret < 0) | |
644 | goto out_sem; | |
7b9c0976 | 645 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
646 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); |
647 | if (nilfs_checkpoint_invalid(cp)) { | |
648 | ret = -ENOENT; | |
7b9c0976 | 649 | kunmap_atomic(kaddr); |
29619809 KS |
650 | goto out_cp; |
651 | } | |
652 | if (nilfs_checkpoint_snapshot(cp)) { | |
653 | ret = 0; | |
7b9c0976 | 654 | kunmap_atomic(kaddr); |
29619809 KS |
655 | goto out_cp; |
656 | } | |
7b9c0976 | 657 | kunmap_atomic(kaddr); |
29619809 KS |
658 | |
659 | ret = nilfs_cpfile_get_header_block(cpfile, &header_bh); | |
660 | if (ret < 0) | |
661 | goto out_cp; | |
7b9c0976 | 662 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
663 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr); |
664 | list = &header->ch_snapshot_list; | |
665 | curr_bh = header_bh; | |
666 | get_bh(curr_bh); | |
667 | curr = 0; | |
668 | curr_blkoff = 0; | |
669 | prev = le64_to_cpu(list->ssl_prev); | |
670 | while (prev > cno) { | |
671 | prev_blkoff = nilfs_cpfile_get_blkoff(cpfile, prev); | |
672 | curr = prev; | |
673 | if (curr_blkoff != prev_blkoff) { | |
7b9c0976 | 674 | kunmap_atomic(kaddr); |
29619809 KS |
675 | brelse(curr_bh); |
676 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, | |
677 | 0, &curr_bh); | |
678 | if (ret < 0) | |
679 | goto out_header; | |
7b9c0976 | 680 | kaddr = kmap_atomic(curr_bh->b_page); |
29619809 KS |
681 | } |
682 | curr_blkoff = prev_blkoff; | |
683 | cp = nilfs_cpfile_block_get_checkpoint( | |
684 | cpfile, curr, curr_bh, kaddr); | |
685 | list = &cp->cp_snapshot_list; | |
686 | prev = le64_to_cpu(list->ssl_prev); | |
687 | } | |
7b9c0976 | 688 | kunmap_atomic(kaddr); |
29619809 KS |
689 | |
690 | if (prev != 0) { | |
691 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0, | |
692 | &prev_bh); | |
693 | if (ret < 0) | |
694 | goto out_curr; | |
695 | } else { | |
696 | prev_bh = header_bh; | |
697 | get_bh(prev_bh); | |
698 | } | |
699 | ||
7b9c0976 | 700 | kaddr = kmap_atomic(curr_bh->b_page); |
29619809 KS |
701 | list = nilfs_cpfile_block_get_snapshot_list( |
702 | cpfile, curr, curr_bh, kaddr); | |
703 | list->ssl_prev = cpu_to_le64(cno); | |
7b9c0976 | 704 | kunmap_atomic(kaddr); |
29619809 | 705 | |
7b9c0976 | 706 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
707 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); |
708 | cp->cp_snapshot_list.ssl_next = cpu_to_le64(curr); | |
709 | cp->cp_snapshot_list.ssl_prev = cpu_to_le64(prev); | |
710 | nilfs_checkpoint_set_snapshot(cp); | |
7b9c0976 | 711 | kunmap_atomic(kaddr); |
29619809 | 712 | |
7b9c0976 | 713 | kaddr = kmap_atomic(prev_bh->b_page); |
29619809 KS |
714 | list = nilfs_cpfile_block_get_snapshot_list( |
715 | cpfile, prev, prev_bh, kaddr); | |
716 | list->ssl_next = cpu_to_le64(cno); | |
7b9c0976 | 717 | kunmap_atomic(kaddr); |
29619809 | 718 | |
7b9c0976 | 719 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
720 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr); |
721 | le64_add_cpu(&header->ch_nsnapshots, 1); | |
7b9c0976 | 722 | kunmap_atomic(kaddr); |
29619809 | 723 | |
5fc7b141 RK |
724 | mark_buffer_dirty(prev_bh); |
725 | mark_buffer_dirty(curr_bh); | |
726 | mark_buffer_dirty(cp_bh); | |
727 | mark_buffer_dirty(header_bh); | |
29619809 KS |
728 | nilfs_mdt_mark_dirty(cpfile); |
729 | ||
730 | brelse(prev_bh); | |
731 | ||
732 | out_curr: | |
733 | brelse(curr_bh); | |
734 | ||
735 | out_header: | |
736 | brelse(header_bh); | |
737 | ||
738 | out_cp: | |
739 | brelse(cp_bh); | |
740 | ||
741 | out_sem: | |
742 | up_write(&NILFS_MDT(cpfile)->mi_sem); | |
743 | return ret; | |
744 | } | |
745 | ||
746 | static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno) | |
747 | { | |
748 | struct buffer_head *header_bh, *next_bh, *prev_bh, *cp_bh; | |
749 | struct nilfs_cpfile_header *header; | |
750 | struct nilfs_checkpoint *cp; | |
751 | struct nilfs_snapshot_list *list; | |
752 | __u64 next, prev; | |
753 | void *kaddr; | |
754 | int ret; | |
755 | ||
1f5abe7e RK |
756 | if (cno == 0) |
757 | return -ENOENT; /* checkpoint number 0 is invalid */ | |
29619809 KS |
758 | down_write(&NILFS_MDT(cpfile)->mi_sem); |
759 | ||
760 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh); | |
761 | if (ret < 0) | |
762 | goto out_sem; | |
7b9c0976 | 763 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
764 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); |
765 | if (nilfs_checkpoint_invalid(cp)) { | |
766 | ret = -ENOENT; | |
7b9c0976 | 767 | kunmap_atomic(kaddr); |
29619809 KS |
768 | goto out_cp; |
769 | } | |
770 | if (!nilfs_checkpoint_snapshot(cp)) { | |
771 | ret = 0; | |
7b9c0976 | 772 | kunmap_atomic(kaddr); |
29619809 KS |
773 | goto out_cp; |
774 | } | |
775 | ||
776 | list = &cp->cp_snapshot_list; | |
777 | next = le64_to_cpu(list->ssl_next); | |
778 | prev = le64_to_cpu(list->ssl_prev); | |
7b9c0976 | 779 | kunmap_atomic(kaddr); |
29619809 KS |
780 | |
781 | ret = nilfs_cpfile_get_header_block(cpfile, &header_bh); | |
782 | if (ret < 0) | |
783 | goto out_cp; | |
784 | if (next != 0) { | |
785 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, next, 0, | |
786 | &next_bh); | |
787 | if (ret < 0) | |
788 | goto out_header; | |
789 | } else { | |
790 | next_bh = header_bh; | |
791 | get_bh(next_bh); | |
792 | } | |
793 | if (prev != 0) { | |
794 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0, | |
795 | &prev_bh); | |
796 | if (ret < 0) | |
797 | goto out_next; | |
798 | } else { | |
799 | prev_bh = header_bh; | |
800 | get_bh(prev_bh); | |
801 | } | |
802 | ||
7b9c0976 | 803 | kaddr = kmap_atomic(next_bh->b_page); |
29619809 KS |
804 | list = nilfs_cpfile_block_get_snapshot_list( |
805 | cpfile, next, next_bh, kaddr); | |
806 | list->ssl_prev = cpu_to_le64(prev); | |
7b9c0976 | 807 | kunmap_atomic(kaddr); |
29619809 | 808 | |
7b9c0976 | 809 | kaddr = kmap_atomic(prev_bh->b_page); |
29619809 KS |
810 | list = nilfs_cpfile_block_get_snapshot_list( |
811 | cpfile, prev, prev_bh, kaddr); | |
812 | list->ssl_next = cpu_to_le64(next); | |
7b9c0976 | 813 | kunmap_atomic(kaddr); |
29619809 | 814 | |
7b9c0976 | 815 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
816 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); |
817 | cp->cp_snapshot_list.ssl_next = cpu_to_le64(0); | |
818 | cp->cp_snapshot_list.ssl_prev = cpu_to_le64(0); | |
819 | nilfs_checkpoint_clear_snapshot(cp); | |
7b9c0976 | 820 | kunmap_atomic(kaddr); |
29619809 | 821 | |
7b9c0976 | 822 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
823 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr); |
824 | le64_add_cpu(&header->ch_nsnapshots, -1); | |
7b9c0976 | 825 | kunmap_atomic(kaddr); |
29619809 | 826 | |
5fc7b141 RK |
827 | mark_buffer_dirty(next_bh); |
828 | mark_buffer_dirty(prev_bh); | |
829 | mark_buffer_dirty(cp_bh); | |
830 | mark_buffer_dirty(header_bh); | |
29619809 KS |
831 | nilfs_mdt_mark_dirty(cpfile); |
832 | ||
833 | brelse(prev_bh); | |
834 | ||
835 | out_next: | |
836 | brelse(next_bh); | |
837 | ||
838 | out_header: | |
839 | brelse(header_bh); | |
840 | ||
841 | out_cp: | |
842 | brelse(cp_bh); | |
843 | ||
844 | out_sem: | |
845 | up_write(&NILFS_MDT(cpfile)->mi_sem); | |
846 | return ret; | |
847 | } | |
848 | ||
849 | /** | |
850 | * nilfs_cpfile_is_snapshot - | |
851 | * @cpfile: inode of checkpoint file | |
852 | * @cno: checkpoint number | |
853 | * | |
854 | * Description: | |
855 | * | |
856 | * Return Value: On success, 1 is returned if the checkpoint specified by | |
857 | * @cno is a snapshot, or 0 if not. On error, one of the following negative | |
858 | * error codes is returned. | |
859 | * | |
860 | * %-EIO - I/O error. | |
861 | * | |
862 | * %-ENOMEM - Insufficient amount of memory available. | |
863 | * | |
864 | * %-ENOENT - No such checkpoint. | |
865 | */ | |
866 | int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno) | |
867 | { | |
868 | struct buffer_head *bh; | |
869 | struct nilfs_checkpoint *cp; | |
870 | void *kaddr; | |
871 | int ret; | |
872 | ||
43be0ec0 ZY |
873 | /* CP number is invalid if it's zero or larger than the |
874 | largest exist one.*/ | |
875 | if (cno == 0 || cno >= nilfs_mdt_cno(cpfile)) | |
876 | return -ENOENT; | |
29619809 KS |
877 | down_read(&NILFS_MDT(cpfile)->mi_sem); |
878 | ||
879 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh); | |
880 | if (ret < 0) | |
881 | goto out; | |
7b9c0976 | 882 | kaddr = kmap_atomic(bh->b_page); |
29619809 | 883 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr); |
43be0ec0 ZY |
884 | if (nilfs_checkpoint_invalid(cp)) |
885 | ret = -ENOENT; | |
886 | else | |
887 | ret = nilfs_checkpoint_snapshot(cp); | |
7b9c0976 | 888 | kunmap_atomic(kaddr); |
29619809 KS |
889 | brelse(bh); |
890 | ||
891 | out: | |
892 | up_read(&NILFS_MDT(cpfile)->mi_sem); | |
893 | return ret; | |
894 | } | |
895 | ||
896 | /** | |
897 | * nilfs_cpfile_change_cpmode - change checkpoint mode | |
898 | * @cpfile: inode of checkpoint file | |
899 | * @cno: checkpoint number | |
900 | * @status: mode of checkpoint | |
901 | * | |
902 | * Description: nilfs_change_cpmode() changes the mode of the checkpoint | |
903 | * specified by @cno. The mode @mode is NILFS_CHECKPOINT or NILFS_SNAPSHOT. | |
904 | * | |
905 | * Return Value: On success, 0 is returned. On error, one of the following | |
906 | * negative error codes is returned. | |
907 | * | |
908 | * %-EIO - I/O error. | |
909 | * | |
910 | * %-ENOMEM - Insufficient amount of memory available. | |
911 | * | |
912 | * %-ENOENT - No such checkpoint. | |
913 | */ | |
914 | int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode) | |
915 | { | |
29619809 KS |
916 | int ret; |
917 | ||
29619809 KS |
918 | switch (mode) { |
919 | case NILFS_CHECKPOINT: | |
032dbb3b RK |
920 | if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno)) |
921 | /* | |
922 | * Current implementation does not have to protect | |
923 | * plain read-only mounts since they are exclusive | |
924 | * with a read/write mount and are protected from the | |
925 | * cleaner. | |
926 | */ | |
29619809 | 927 | ret = -EBUSY; |
032dbb3b | 928 | else |
29619809 | 929 | ret = nilfs_cpfile_clear_snapshot(cpfile, cno); |
29619809 KS |
930 | return ret; |
931 | case NILFS_SNAPSHOT: | |
932 | return nilfs_cpfile_set_snapshot(cpfile, cno); | |
933 | default: | |
934 | return -EINVAL; | |
935 | } | |
936 | } | |
937 | ||
938 | /** | |
939 | * nilfs_cpfile_get_stat - get checkpoint statistics | |
940 | * @cpfile: inode of checkpoint file | |
941 | * @stat: pointer to a structure of checkpoint statistics | |
942 | * | |
943 | * Description: nilfs_cpfile_get_stat() returns information about checkpoints. | |
944 | * | |
945 | * Return Value: On success, 0 is returned, and checkpoints information is | |
946 | * stored in the place pointed by @stat. On error, one of the following | |
947 | * negative error codes is returned. | |
948 | * | |
949 | * %-EIO - I/O error. | |
950 | * | |
951 | * %-ENOMEM - Insufficient amount of memory available. | |
952 | */ | |
953 | int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat) | |
954 | { | |
955 | struct buffer_head *bh; | |
956 | struct nilfs_cpfile_header *header; | |
957 | void *kaddr; | |
958 | int ret; | |
959 | ||
960 | down_read(&NILFS_MDT(cpfile)->mi_sem); | |
961 | ||
962 | ret = nilfs_cpfile_get_header_block(cpfile, &bh); | |
963 | if (ret < 0) | |
964 | goto out_sem; | |
7b9c0976 | 965 | kaddr = kmap_atomic(bh->b_page); |
29619809 KS |
966 | header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr); |
967 | cpstat->cs_cno = nilfs_mdt_cno(cpfile); | |
968 | cpstat->cs_ncps = le64_to_cpu(header->ch_ncheckpoints); | |
969 | cpstat->cs_nsss = le64_to_cpu(header->ch_nsnapshots); | |
7b9c0976 | 970 | kunmap_atomic(kaddr); |
29619809 KS |
971 | brelse(bh); |
972 | ||
973 | out_sem: | |
974 | up_read(&NILFS_MDT(cpfile)->mi_sem); | |
975 | return ret; | |
976 | } | |
79739565 | 977 | |
8707df38 | 978 | /** |
f1e89c86 RK |
979 | * nilfs_cpfile_read - read or get cpfile inode |
980 | * @sb: super block instance | |
79739565 | 981 | * @cpsize: size of a checkpoint entry |
f1e89c86 RK |
982 | * @raw_inode: on-disk cpfile inode |
983 | * @inodep: buffer to store the inode | |
79739565 | 984 | */ |
f1e89c86 RK |
985 | int nilfs_cpfile_read(struct super_block *sb, size_t cpsize, |
986 | struct nilfs_inode *raw_inode, struct inode **inodep) | |
79739565 RK |
987 | { |
988 | struct inode *cpfile; | |
f1e89c86 | 989 | int err; |
79739565 | 990 | |
0ec060d1 RK |
991 | if (cpsize > sb->s_blocksize) { |
992 | printk(KERN_ERR | |
993 | "NILFS: too large checkpoint size: %zu bytes.\n", | |
994 | cpsize); | |
995 | return -EINVAL; | |
996 | } else if (cpsize < NILFS_MIN_CHECKPOINT_SIZE) { | |
997 | printk(KERN_ERR | |
998 | "NILFS: too small checkpoint size: %zu bytes.\n", | |
999 | cpsize); | |
1000 | return -EINVAL; | |
1001 | } | |
1002 | ||
f1e89c86 RK |
1003 | cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO); |
1004 | if (unlikely(!cpfile)) | |
1005 | return -ENOMEM; | |
1006 | if (!(cpfile->i_state & I_NEW)) | |
1007 | goto out; | |
1008 | ||
1009 | err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0); | |
1010 | if (err) | |
1011 | goto failed; | |
1012 | ||
1013 | nilfs_mdt_set_entry_size(cpfile, cpsize, | |
1014 | sizeof(struct nilfs_cpfile_header)); | |
1015 | ||
1016 | err = nilfs_read_inode_common(cpfile, raw_inode); | |
1017 | if (err) | |
1018 | goto failed; | |
1019 | ||
1020 | unlock_new_inode(cpfile); | |
1021 | out: | |
1022 | *inodep = cpfile; | |
1023 | return 0; | |
1024 | failed: | |
1025 | iget_failed(cpfile); | |
1026 | return err; | |
79739565 | 1027 | } |