Commit | Line | Data |
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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 | * | |
29619809 KS |
16 | * Written by Koji Sato <koji@osrg.net>. |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/buffer_head.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/nilfs2_fs.h> | |
25 | #include "mdt.h" | |
26 | #include "cpfile.h" | |
27 | ||
28 | ||
29 | static inline unsigned long | |
30 | nilfs_cpfile_checkpoints_per_block(const struct inode *cpfile) | |
31 | { | |
32 | return NILFS_MDT(cpfile)->mi_entries_per_block; | |
33 | } | |
34 | ||
35 | /* block number from the beginning of the file */ | |
36 | static unsigned long | |
37 | nilfs_cpfile_get_blkoff(const struct inode *cpfile, __u64 cno) | |
38 | { | |
1f5abe7e | 39 | __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1; |
29619809 KS |
40 | do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile)); |
41 | return (unsigned long)tcno; | |
42 | } | |
43 | ||
44 | /* offset in block */ | |
45 | static unsigned long | |
46 | nilfs_cpfile_get_offset(const struct inode *cpfile, __u64 cno) | |
47 | { | |
48 | __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1; | |
49 | return do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile)); | |
50 | } | |
51 | ||
53a2c3bd RK |
52 | static __u64 nilfs_cpfile_first_checkpoint_in_block(const struct inode *cpfile, |
53 | unsigned long blkoff) | |
54 | { | |
55 | return (__u64)nilfs_cpfile_checkpoints_per_block(cpfile) * blkoff | |
56 | + 1 - NILFS_MDT(cpfile)->mi_first_entry_offset; | |
57 | } | |
58 | ||
29619809 KS |
59 | static unsigned long |
60 | nilfs_cpfile_checkpoints_in_block(const struct inode *cpfile, | |
61 | __u64 curr, | |
62 | __u64 max) | |
63 | { | |
64 | return min_t(__u64, | |
65 | nilfs_cpfile_checkpoints_per_block(cpfile) - | |
66 | nilfs_cpfile_get_offset(cpfile, curr), | |
67 | max - curr); | |
68 | } | |
69 | ||
70 | static inline int nilfs_cpfile_is_in_first(const struct inode *cpfile, | |
71 | __u64 cno) | |
72 | { | |
73 | return nilfs_cpfile_get_blkoff(cpfile, cno) == 0; | |
74 | } | |
75 | ||
76 | static unsigned int | |
77 | nilfs_cpfile_block_add_valid_checkpoints(const struct inode *cpfile, | |
78 | struct buffer_head *bh, | |
79 | void *kaddr, | |
80 | unsigned int n) | |
81 | { | |
82 | struct nilfs_checkpoint *cp = kaddr + bh_offset(bh); | |
83 | unsigned int count; | |
84 | ||
85 | count = le32_to_cpu(cp->cp_checkpoints_count) + n; | |
86 | cp->cp_checkpoints_count = cpu_to_le32(count); | |
87 | return count; | |
88 | } | |
89 | ||
90 | static unsigned int | |
91 | nilfs_cpfile_block_sub_valid_checkpoints(const struct inode *cpfile, | |
92 | struct buffer_head *bh, | |
93 | void *kaddr, | |
94 | unsigned int n) | |
95 | { | |
96 | struct nilfs_checkpoint *cp = kaddr + bh_offset(bh); | |
97 | unsigned int count; | |
98 | ||
1f5abe7e | 99 | WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n); |
29619809 KS |
100 | count = le32_to_cpu(cp->cp_checkpoints_count) - n; |
101 | cp->cp_checkpoints_count = cpu_to_le32(count); | |
102 | return count; | |
103 | } | |
104 | ||
105 | static inline struct nilfs_cpfile_header * | |
106 | nilfs_cpfile_block_get_header(const struct inode *cpfile, | |
107 | struct buffer_head *bh, | |
108 | void *kaddr) | |
109 | { | |
110 | return kaddr + bh_offset(bh); | |
111 | } | |
112 | ||
113 | static struct nilfs_checkpoint * | |
114 | nilfs_cpfile_block_get_checkpoint(const struct inode *cpfile, __u64 cno, | |
115 | struct buffer_head *bh, | |
116 | void *kaddr) | |
117 | { | |
118 | return kaddr + bh_offset(bh) + nilfs_cpfile_get_offset(cpfile, cno) * | |
119 | NILFS_MDT(cpfile)->mi_entry_size; | |
120 | } | |
121 | ||
122 | static void nilfs_cpfile_block_init(struct inode *cpfile, | |
123 | struct buffer_head *bh, | |
124 | void *kaddr) | |
125 | { | |
126 | struct nilfs_checkpoint *cp = kaddr + bh_offset(bh); | |
127 | size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size; | |
128 | int n = nilfs_cpfile_checkpoints_per_block(cpfile); | |
129 | ||
130 | while (n-- > 0) { | |
131 | nilfs_checkpoint_set_invalid(cp); | |
132 | cp = (void *)cp + cpsz; | |
133 | } | |
134 | } | |
135 | ||
136 | static inline int nilfs_cpfile_get_header_block(struct inode *cpfile, | |
137 | struct buffer_head **bhp) | |
138 | { | |
139 | return nilfs_mdt_get_block(cpfile, 0, 0, NULL, bhp); | |
140 | } | |
141 | ||
142 | static inline int nilfs_cpfile_get_checkpoint_block(struct inode *cpfile, | |
143 | __u64 cno, | |
144 | int create, | |
145 | struct buffer_head **bhp) | |
146 | { | |
147 | return nilfs_mdt_get_block(cpfile, | |
148 | nilfs_cpfile_get_blkoff(cpfile, cno), | |
149 | create, nilfs_cpfile_block_init, bhp); | |
150 | } | |
151 | ||
53a2c3bd RK |
152 | /** |
153 | * nilfs_cpfile_find_checkpoint_block - find and get a buffer on cpfile | |
154 | * @cpfile: inode of cpfile | |
155 | * @start_cno: start checkpoint number (inclusive) | |
156 | * @end_cno: end checkpoint number (inclusive) | |
157 | * @cnop: place to store the next checkpoint number | |
158 | * @bhp: place to store a pointer to buffer_head struct | |
159 | * | |
160 | * Return Value: On success, it returns 0. On error, the following negative | |
161 | * error code is returned. | |
162 | * | |
163 | * %-ENOMEM - Insufficient memory available. | |
164 | * | |
165 | * %-EIO - I/O error | |
166 | * | |
167 | * %-ENOENT - no block exists in the range. | |
168 | */ | |
169 | static int nilfs_cpfile_find_checkpoint_block(struct inode *cpfile, | |
170 | __u64 start_cno, __u64 end_cno, | |
171 | __u64 *cnop, | |
172 | struct buffer_head **bhp) | |
173 | { | |
174 | unsigned long start, end, blkoff; | |
175 | int ret; | |
176 | ||
177 | if (unlikely(start_cno > end_cno)) | |
178 | return -ENOENT; | |
179 | ||
180 | start = nilfs_cpfile_get_blkoff(cpfile, start_cno); | |
181 | end = nilfs_cpfile_get_blkoff(cpfile, end_cno); | |
182 | ||
183 | ret = nilfs_mdt_find_block(cpfile, start, end, &blkoff, bhp); | |
184 | if (!ret) | |
185 | *cnop = (blkoff == start) ? start_cno : | |
186 | nilfs_cpfile_first_checkpoint_in_block(cpfile, blkoff); | |
187 | return ret; | |
188 | } | |
189 | ||
29619809 KS |
190 | static inline int nilfs_cpfile_delete_checkpoint_block(struct inode *cpfile, |
191 | __u64 cno) | |
192 | { | |
193 | return nilfs_mdt_delete_block(cpfile, | |
194 | nilfs_cpfile_get_blkoff(cpfile, cno)); | |
195 | } | |
196 | ||
197 | /** | |
198 | * nilfs_cpfile_get_checkpoint - get a checkpoint | |
199 | * @cpfile: inode of checkpoint file | |
200 | * @cno: checkpoint number | |
201 | * @create: create flag | |
202 | * @cpp: pointer to a checkpoint | |
203 | * @bhp: pointer to a buffer head | |
204 | * | |
205 | * Description: nilfs_cpfile_get_checkpoint() acquires the checkpoint | |
206 | * specified by @cno. A new checkpoint will be created if @cno is the current | |
207 | * checkpoint number and @create is nonzero. | |
208 | * | |
209 | * Return Value: On success, 0 is returned, and the checkpoint and the | |
210 | * buffer head of the buffer on which the checkpoint is located are stored in | |
211 | * the place pointed by @cpp and @bhp, respectively. On error, one of the | |
212 | * following negative error codes is returned. | |
213 | * | |
214 | * %-EIO - I/O error. | |
215 | * | |
216 | * %-ENOMEM - Insufficient amount of memory available. | |
217 | * | |
218 | * %-ENOENT - No such checkpoint. | |
1f5abe7e RK |
219 | * |
220 | * %-EINVAL - invalid checkpoint. | |
29619809 KS |
221 | */ |
222 | int nilfs_cpfile_get_checkpoint(struct inode *cpfile, | |
223 | __u64 cno, | |
224 | int create, | |
225 | struct nilfs_checkpoint **cpp, | |
226 | struct buffer_head **bhp) | |
227 | { | |
228 | struct buffer_head *header_bh, *cp_bh; | |
229 | struct nilfs_cpfile_header *header; | |
230 | struct nilfs_checkpoint *cp; | |
231 | void *kaddr; | |
232 | int ret; | |
233 | ||
1f5abe7e RK |
234 | if (unlikely(cno < 1 || cno > nilfs_mdt_cno(cpfile) || |
235 | (cno < nilfs_mdt_cno(cpfile) && create))) | |
236 | return -EINVAL; | |
29619809 KS |
237 | |
238 | down_write(&NILFS_MDT(cpfile)->mi_sem); | |
239 | ||
240 | ret = nilfs_cpfile_get_header_block(cpfile, &header_bh); | |
241 | if (ret < 0) | |
242 | goto out_sem; | |
243 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, create, &cp_bh); | |
244 | if (ret < 0) | |
245 | goto out_header; | |
246 | kaddr = kmap(cp_bh->b_page); | |
247 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); | |
248 | if (nilfs_checkpoint_invalid(cp)) { | |
249 | if (!create) { | |
250 | kunmap(cp_bh->b_page); | |
251 | brelse(cp_bh); | |
252 | ret = -ENOENT; | |
253 | goto out_header; | |
254 | } | |
255 | /* a newly-created checkpoint */ | |
256 | nilfs_checkpoint_clear_invalid(cp); | |
257 | if (!nilfs_cpfile_is_in_first(cpfile, cno)) | |
258 | nilfs_cpfile_block_add_valid_checkpoints(cpfile, cp_bh, | |
259 | kaddr, 1); | |
5fc7b141 | 260 | mark_buffer_dirty(cp_bh); |
29619809 | 261 | |
7b9c0976 | 262 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
263 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, |
264 | kaddr); | |
265 | le64_add_cpu(&header->ch_ncheckpoints, 1); | |
7b9c0976 | 266 | kunmap_atomic(kaddr); |
5fc7b141 | 267 | mark_buffer_dirty(header_bh); |
29619809 KS |
268 | nilfs_mdt_mark_dirty(cpfile); |
269 | } | |
270 | ||
271 | if (cpp != NULL) | |
272 | *cpp = cp; | |
273 | *bhp = cp_bh; | |
274 | ||
275 | out_header: | |
276 | brelse(header_bh); | |
277 | ||
278 | out_sem: | |
279 | up_write(&NILFS_MDT(cpfile)->mi_sem); | |
280 | return ret; | |
281 | } | |
282 | ||
283 | /** | |
284 | * nilfs_cpfile_put_checkpoint - put a checkpoint | |
285 | * @cpfile: inode of checkpoint file | |
286 | * @cno: checkpoint number | |
287 | * @bh: buffer head | |
288 | * | |
289 | * Description: nilfs_cpfile_put_checkpoint() releases the checkpoint | |
290 | * specified by @cno. @bh must be the buffer head which has been returned by | |
291 | * a previous call to nilfs_cpfile_get_checkpoint() with @cno. | |
292 | */ | |
293 | void nilfs_cpfile_put_checkpoint(struct inode *cpfile, __u64 cno, | |
294 | struct buffer_head *bh) | |
295 | { | |
296 | kunmap(bh->b_page); | |
297 | brelse(bh); | |
298 | } | |
299 | ||
300 | /** | |
301 | * nilfs_cpfile_delete_checkpoints - delete checkpoints | |
302 | * @cpfile: inode of checkpoint file | |
303 | * @start: start checkpoint number | |
304 | * @end: end checkpoint numer | |
305 | * | |
306 | * Description: nilfs_cpfile_delete_checkpoints() deletes the checkpoints in | |
307 | * the period from @start to @end, excluding @end itself. The checkpoints | |
308 | * which have been already deleted are ignored. | |
309 | * | |
310 | * Return Value: On success, 0 is returned. On error, one of the following | |
311 | * negative error codes is returned. | |
312 | * | |
313 | * %-EIO - I/O error. | |
314 | * | |
315 | * %-ENOMEM - Insufficient amount of memory available. | |
316 | * | |
317 | * %-EINVAL - invalid checkpoints. | |
318 | */ | |
319 | int nilfs_cpfile_delete_checkpoints(struct inode *cpfile, | |
320 | __u64 start, | |
321 | __u64 end) | |
322 | { | |
323 | struct buffer_head *header_bh, *cp_bh; | |
324 | struct nilfs_cpfile_header *header; | |
325 | struct nilfs_checkpoint *cp; | |
326 | size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size; | |
327 | __u64 cno; | |
328 | void *kaddr; | |
329 | unsigned long tnicps; | |
fe0627e7 | 330 | int ret, ncps, nicps, nss, count, i; |
29619809 | 331 | |
1f5abe7e RK |
332 | if (unlikely(start == 0 || start > end)) { |
333 | printk(KERN_ERR "%s: invalid range of checkpoint numbers: " | |
334 | "[%llu, %llu)\n", __func__, | |
335 | (unsigned long long)start, (unsigned long long)end); | |
336 | return -EINVAL; | |
29619809 KS |
337 | } |
338 | ||
29619809 KS |
339 | down_write(&NILFS_MDT(cpfile)->mi_sem); |
340 | ||
341 | ret = nilfs_cpfile_get_header_block(cpfile, &header_bh); | |
342 | if (ret < 0) | |
343 | goto out_sem; | |
344 | tnicps = 0; | |
fe0627e7 | 345 | nss = 0; |
29619809 KS |
346 | |
347 | for (cno = start; cno < end; cno += ncps) { | |
348 | ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, end); | |
349 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh); | |
350 | if (ret < 0) { | |
351 | if (ret != -ENOENT) | |
d9a0a345 | 352 | break; |
29619809 KS |
353 | /* skip hole */ |
354 | ret = 0; | |
355 | continue; | |
356 | } | |
357 | ||
7b9c0976 | 358 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
359 | cp = nilfs_cpfile_block_get_checkpoint( |
360 | cpfile, cno, cp_bh, kaddr); | |
361 | nicps = 0; | |
362 | for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) { | |
fe0627e7 RK |
363 | if (nilfs_checkpoint_snapshot(cp)) { |
364 | nss++; | |
365 | } else if (!nilfs_checkpoint_invalid(cp)) { | |
29619809 KS |
366 | nilfs_checkpoint_set_invalid(cp); |
367 | nicps++; | |
368 | } | |
369 | } | |
370 | if (nicps > 0) { | |
371 | tnicps += nicps; | |
5fc7b141 | 372 | mark_buffer_dirty(cp_bh); |
29619809 | 373 | nilfs_mdt_mark_dirty(cpfile); |
5ee58148 JS |
374 | if (!nilfs_cpfile_is_in_first(cpfile, cno)) { |
375 | count = | |
376 | nilfs_cpfile_block_sub_valid_checkpoints( | |
377 | cpfile, cp_bh, kaddr, nicps); | |
378 | if (count == 0) { | |
379 | /* make hole */ | |
7b9c0976 | 380 | kunmap_atomic(kaddr); |
5ee58148 JS |
381 | brelse(cp_bh); |
382 | ret = | |
383 | nilfs_cpfile_delete_checkpoint_block( | |
384 | cpfile, cno); | |
385 | if (ret == 0) | |
386 | continue; | |
387 | printk(KERN_ERR | |
388 | "%s: cannot delete block\n", | |
389 | __func__); | |
390 | break; | |
391 | } | |
29619809 KS |
392 | } |
393 | } | |
394 | ||
7b9c0976 | 395 | kunmap_atomic(kaddr); |
29619809 KS |
396 | brelse(cp_bh); |
397 | } | |
398 | ||
399 | if (tnicps > 0) { | |
7b9c0976 | 400 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
401 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, |
402 | kaddr); | |
6c98cd4e | 403 | le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps); |
5fc7b141 | 404 | mark_buffer_dirty(header_bh); |
29619809 | 405 | nilfs_mdt_mark_dirty(cpfile); |
7b9c0976 | 406 | kunmap_atomic(kaddr); |
29619809 | 407 | } |
62013ab5 | 408 | |
29619809 | 409 | brelse(header_bh); |
fe0627e7 RK |
410 | if (nss > 0) |
411 | ret = -EBUSY; | |
29619809 KS |
412 | |
413 | out_sem: | |
414 | up_write(&NILFS_MDT(cpfile)->mi_sem); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | static void nilfs_cpfile_checkpoint_to_cpinfo(struct inode *cpfile, | |
419 | struct nilfs_checkpoint *cp, | |
420 | struct nilfs_cpinfo *ci) | |
421 | { | |
422 | ci->ci_flags = le32_to_cpu(cp->cp_flags); | |
423 | ci->ci_cno = le64_to_cpu(cp->cp_cno); | |
424 | ci->ci_create = le64_to_cpu(cp->cp_create); | |
425 | ci->ci_nblk_inc = le64_to_cpu(cp->cp_nblk_inc); | |
426 | ci->ci_inodes_count = le64_to_cpu(cp->cp_inodes_count); | |
427 | ci->ci_blocks_count = le64_to_cpu(cp->cp_blocks_count); | |
428 | ci->ci_next = le64_to_cpu(cp->cp_snapshot_list.ssl_next); | |
429 | } | |
430 | ||
76068c4f | 431 | static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop, |
003ff182 | 432 | void *buf, unsigned cisz, size_t nci) |
29619809 KS |
433 | { |
434 | struct nilfs_checkpoint *cp; | |
003ff182 | 435 | struct nilfs_cpinfo *ci = buf; |
29619809 KS |
436 | struct buffer_head *bh; |
437 | size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size; | |
76068c4f | 438 | __u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop; |
29619809 KS |
439 | void *kaddr; |
440 | int n, ret; | |
441 | int ncps, i; | |
442 | ||
1f5abe7e RK |
443 | if (cno == 0) |
444 | return -ENOENT; /* checkpoint number 0 is invalid */ | |
29619809 KS |
445 | down_read(&NILFS_MDT(cpfile)->mi_sem); |
446 | ||
53a2c3bd RK |
447 | for (n = 0; n < nci; cno += ncps) { |
448 | ret = nilfs_cpfile_find_checkpoint_block( | |
449 | cpfile, cno, cur_cno - 1, &cno, &bh); | |
29619809 | 450 | if (ret < 0) { |
53a2c3bd RK |
451 | if (likely(ret == -ENOENT)) |
452 | break; | |
453 | goto out; | |
29619809 | 454 | } |
53a2c3bd | 455 | ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno); |
29619809 | 456 | |
7b9c0976 | 457 | kaddr = kmap_atomic(bh->b_page); |
29619809 KS |
458 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr); |
459 | for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) { | |
003ff182 RK |
460 | if (!nilfs_checkpoint_invalid(cp)) { |
461 | nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, | |
462 | ci); | |
463 | ci = (void *)ci + cisz; | |
464 | n++; | |
465 | } | |
29619809 | 466 | } |
7b9c0976 | 467 | kunmap_atomic(kaddr); |
29619809 KS |
468 | brelse(bh); |
469 | } | |
470 | ||
471 | ret = n; | |
003ff182 RK |
472 | if (n > 0) { |
473 | ci = (void *)ci - cisz; | |
474 | *cnop = ci->ci_cno + 1; | |
475 | } | |
29619809 KS |
476 | |
477 | out: | |
478 | up_read(&NILFS_MDT(cpfile)->mi_sem); | |
479 | return ret; | |
480 | } | |
481 | ||
b028fcfc | 482 | static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop, |
003ff182 | 483 | void *buf, unsigned cisz, size_t nci) |
29619809 KS |
484 | { |
485 | struct buffer_head *bh; | |
486 | struct nilfs_cpfile_header *header; | |
487 | struct nilfs_checkpoint *cp; | |
003ff182 | 488 | struct nilfs_cpinfo *ci = buf; |
b028fcfc | 489 | __u64 curr = *cnop, next; |
29619809 KS |
490 | unsigned long curr_blkoff, next_blkoff; |
491 | void *kaddr; | |
7fa10d20 | 492 | int n = 0, ret; |
29619809 KS |
493 | |
494 | down_read(&NILFS_MDT(cpfile)->mi_sem); | |
495 | ||
b028fcfc | 496 | if (curr == 0) { |
29619809 KS |
497 | ret = nilfs_cpfile_get_header_block(cpfile, &bh); |
498 | if (ret < 0) | |
499 | goto out; | |
7b9c0976 | 500 | kaddr = kmap_atomic(bh->b_page); |
29619809 KS |
501 | header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr); |
502 | curr = le64_to_cpu(header->ch_snapshot_list.ssl_next); | |
7b9c0976 | 503 | kunmap_atomic(kaddr); |
29619809 KS |
504 | brelse(bh); |
505 | if (curr == 0) { | |
506 | ret = 0; | |
507 | goto out; | |
508 | } | |
b028fcfc RK |
509 | } else if (unlikely(curr == ~(__u64)0)) { |
510 | ret = 0; | |
511 | goto out; | |
512 | } | |
513 | ||
29619809 KS |
514 | curr_blkoff = nilfs_cpfile_get_blkoff(cpfile, curr); |
515 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, 0, &bh); | |
7fa10d20 RK |
516 | if (unlikely(ret < 0)) { |
517 | if (ret == -ENOENT) | |
518 | ret = 0; /* No snapshots (started from a hole block) */ | |
29619809 | 519 | goto out; |
7fa10d20 | 520 | } |
7b9c0976 | 521 | kaddr = kmap_atomic(bh->b_page); |
7fa10d20 RK |
522 | while (n < nci) { |
523 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, curr, bh, kaddr); | |
524 | curr = ~(__u64)0; /* Terminator */ | |
525 | if (unlikely(nilfs_checkpoint_invalid(cp) || | |
526 | !nilfs_checkpoint_snapshot(cp))) | |
29619809 | 527 | break; |
003ff182 RK |
528 | nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, ci); |
529 | ci = (void *)ci + cisz; | |
530 | n++; | |
7fa10d20 RK |
531 | next = le64_to_cpu(cp->cp_snapshot_list.ssl_next); |
532 | if (next == 0) | |
533 | break; /* reach end of the snapshot list */ | |
534 | ||
29619809 KS |
535 | next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next); |
536 | if (curr_blkoff != next_blkoff) { | |
7b9c0976 | 537 | kunmap_atomic(kaddr); |
29619809 KS |
538 | brelse(bh); |
539 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, next, | |
540 | 0, &bh); | |
7fa10d20 RK |
541 | if (unlikely(ret < 0)) { |
542 | WARN_ON(ret == -ENOENT); | |
29619809 | 543 | goto out; |
7fa10d20 | 544 | } |
7b9c0976 | 545 | kaddr = kmap_atomic(bh->b_page); |
29619809 KS |
546 | } |
547 | curr = next; | |
548 | curr_blkoff = next_blkoff; | |
549 | } | |
7b9c0976 | 550 | kunmap_atomic(kaddr); |
29619809 | 551 | brelse(bh); |
b028fcfc | 552 | *cnop = curr; |
29619809 KS |
553 | ret = n; |
554 | ||
555 | out: | |
556 | up_read(&NILFS_MDT(cpfile)->mi_sem); | |
557 | return ret; | |
558 | } | |
559 | ||
560 | /** | |
561 | * nilfs_cpfile_get_cpinfo - | |
562 | * @cpfile: | |
563 | * @cno: | |
564 | * @ci: | |
565 | * @nci: | |
566 | */ | |
b028fcfc RK |
567 | |
568 | ssize_t nilfs_cpfile_get_cpinfo(struct inode *cpfile, __u64 *cnop, int mode, | |
003ff182 | 569 | void *buf, unsigned cisz, size_t nci) |
29619809 KS |
570 | { |
571 | switch (mode) { | |
572 | case NILFS_CHECKPOINT: | |
003ff182 | 573 | return nilfs_cpfile_do_get_cpinfo(cpfile, cnop, buf, cisz, nci); |
29619809 | 574 | case NILFS_SNAPSHOT: |
003ff182 | 575 | return nilfs_cpfile_do_get_ssinfo(cpfile, cnop, buf, cisz, nci); |
29619809 KS |
576 | default: |
577 | return -EINVAL; | |
578 | } | |
579 | } | |
580 | ||
581 | /** | |
582 | * nilfs_cpfile_delete_checkpoint - | |
583 | * @cpfile: | |
584 | * @cno: | |
585 | */ | |
586 | int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno) | |
587 | { | |
588 | struct nilfs_cpinfo ci; | |
76068c4f | 589 | __u64 tcno = cno; |
29619809 | 590 | ssize_t nci; |
29619809 | 591 | |
003ff182 | 592 | nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, sizeof(ci), 1); |
29619809 KS |
593 | if (nci < 0) |
594 | return nci; | |
595 | else if (nci == 0 || ci.ci_cno != cno) | |
596 | return -ENOENT; | |
30c25be7 RK |
597 | else if (nilfs_cpinfo_snapshot(&ci)) |
598 | return -EBUSY; | |
29619809 KS |
599 | |
600 | return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1); | |
601 | } | |
602 | ||
603 | static struct nilfs_snapshot_list * | |
604 | nilfs_cpfile_block_get_snapshot_list(const struct inode *cpfile, | |
605 | __u64 cno, | |
606 | struct buffer_head *bh, | |
607 | void *kaddr) | |
608 | { | |
609 | struct nilfs_cpfile_header *header; | |
610 | struct nilfs_checkpoint *cp; | |
611 | struct nilfs_snapshot_list *list; | |
612 | ||
613 | if (cno != 0) { | |
614 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr); | |
615 | list = &cp->cp_snapshot_list; | |
616 | } else { | |
617 | header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr); | |
618 | list = &header->ch_snapshot_list; | |
619 | } | |
620 | return list; | |
621 | } | |
622 | ||
623 | static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno) | |
624 | { | |
625 | struct buffer_head *header_bh, *curr_bh, *prev_bh, *cp_bh; | |
626 | struct nilfs_cpfile_header *header; | |
627 | struct nilfs_checkpoint *cp; | |
628 | struct nilfs_snapshot_list *list; | |
629 | __u64 curr, prev; | |
630 | unsigned long curr_blkoff, prev_blkoff; | |
631 | void *kaddr; | |
632 | int ret; | |
633 | ||
1f5abe7e RK |
634 | if (cno == 0) |
635 | return -ENOENT; /* checkpoint number 0 is invalid */ | |
29619809 KS |
636 | down_write(&NILFS_MDT(cpfile)->mi_sem); |
637 | ||
638 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh); | |
639 | if (ret < 0) | |
640 | goto out_sem; | |
7b9c0976 | 641 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
642 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); |
643 | if (nilfs_checkpoint_invalid(cp)) { | |
644 | ret = -ENOENT; | |
7b9c0976 | 645 | kunmap_atomic(kaddr); |
29619809 KS |
646 | goto out_cp; |
647 | } | |
648 | if (nilfs_checkpoint_snapshot(cp)) { | |
649 | ret = 0; | |
7b9c0976 | 650 | kunmap_atomic(kaddr); |
29619809 KS |
651 | goto out_cp; |
652 | } | |
7b9c0976 | 653 | kunmap_atomic(kaddr); |
29619809 KS |
654 | |
655 | ret = nilfs_cpfile_get_header_block(cpfile, &header_bh); | |
656 | if (ret < 0) | |
657 | goto out_cp; | |
7b9c0976 | 658 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
659 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr); |
660 | list = &header->ch_snapshot_list; | |
661 | curr_bh = header_bh; | |
662 | get_bh(curr_bh); | |
663 | curr = 0; | |
664 | curr_blkoff = 0; | |
665 | prev = le64_to_cpu(list->ssl_prev); | |
666 | while (prev > cno) { | |
667 | prev_blkoff = nilfs_cpfile_get_blkoff(cpfile, prev); | |
668 | curr = prev; | |
669 | if (curr_blkoff != prev_blkoff) { | |
7b9c0976 | 670 | kunmap_atomic(kaddr); |
29619809 KS |
671 | brelse(curr_bh); |
672 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, | |
673 | 0, &curr_bh); | |
674 | if (ret < 0) | |
675 | goto out_header; | |
7b9c0976 | 676 | kaddr = kmap_atomic(curr_bh->b_page); |
29619809 KS |
677 | } |
678 | curr_blkoff = prev_blkoff; | |
679 | cp = nilfs_cpfile_block_get_checkpoint( | |
680 | cpfile, curr, curr_bh, kaddr); | |
681 | list = &cp->cp_snapshot_list; | |
682 | prev = le64_to_cpu(list->ssl_prev); | |
683 | } | |
7b9c0976 | 684 | kunmap_atomic(kaddr); |
29619809 KS |
685 | |
686 | if (prev != 0) { | |
687 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0, | |
688 | &prev_bh); | |
689 | if (ret < 0) | |
690 | goto out_curr; | |
691 | } else { | |
692 | prev_bh = header_bh; | |
693 | get_bh(prev_bh); | |
694 | } | |
695 | ||
7b9c0976 | 696 | kaddr = kmap_atomic(curr_bh->b_page); |
29619809 KS |
697 | list = nilfs_cpfile_block_get_snapshot_list( |
698 | cpfile, curr, curr_bh, kaddr); | |
699 | list->ssl_prev = cpu_to_le64(cno); | |
7b9c0976 | 700 | kunmap_atomic(kaddr); |
29619809 | 701 | |
7b9c0976 | 702 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
703 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); |
704 | cp->cp_snapshot_list.ssl_next = cpu_to_le64(curr); | |
705 | cp->cp_snapshot_list.ssl_prev = cpu_to_le64(prev); | |
706 | nilfs_checkpoint_set_snapshot(cp); | |
7b9c0976 | 707 | kunmap_atomic(kaddr); |
29619809 | 708 | |
7b9c0976 | 709 | kaddr = kmap_atomic(prev_bh->b_page); |
29619809 KS |
710 | list = nilfs_cpfile_block_get_snapshot_list( |
711 | cpfile, prev, prev_bh, kaddr); | |
712 | list->ssl_next = cpu_to_le64(cno); | |
7b9c0976 | 713 | kunmap_atomic(kaddr); |
29619809 | 714 | |
7b9c0976 | 715 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
716 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr); |
717 | le64_add_cpu(&header->ch_nsnapshots, 1); | |
7b9c0976 | 718 | kunmap_atomic(kaddr); |
29619809 | 719 | |
5fc7b141 RK |
720 | mark_buffer_dirty(prev_bh); |
721 | mark_buffer_dirty(curr_bh); | |
722 | mark_buffer_dirty(cp_bh); | |
723 | mark_buffer_dirty(header_bh); | |
29619809 KS |
724 | nilfs_mdt_mark_dirty(cpfile); |
725 | ||
726 | brelse(prev_bh); | |
727 | ||
728 | out_curr: | |
729 | brelse(curr_bh); | |
730 | ||
731 | out_header: | |
732 | brelse(header_bh); | |
733 | ||
734 | out_cp: | |
735 | brelse(cp_bh); | |
736 | ||
737 | out_sem: | |
738 | up_write(&NILFS_MDT(cpfile)->mi_sem); | |
739 | return ret; | |
740 | } | |
741 | ||
742 | static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno) | |
743 | { | |
744 | struct buffer_head *header_bh, *next_bh, *prev_bh, *cp_bh; | |
745 | struct nilfs_cpfile_header *header; | |
746 | struct nilfs_checkpoint *cp; | |
747 | struct nilfs_snapshot_list *list; | |
748 | __u64 next, prev; | |
749 | void *kaddr; | |
750 | int ret; | |
751 | ||
1f5abe7e RK |
752 | if (cno == 0) |
753 | return -ENOENT; /* checkpoint number 0 is invalid */ | |
29619809 KS |
754 | down_write(&NILFS_MDT(cpfile)->mi_sem); |
755 | ||
756 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh); | |
757 | if (ret < 0) | |
758 | goto out_sem; | |
7b9c0976 | 759 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
760 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); |
761 | if (nilfs_checkpoint_invalid(cp)) { | |
762 | ret = -ENOENT; | |
7b9c0976 | 763 | kunmap_atomic(kaddr); |
29619809 KS |
764 | goto out_cp; |
765 | } | |
766 | if (!nilfs_checkpoint_snapshot(cp)) { | |
767 | ret = 0; | |
7b9c0976 | 768 | kunmap_atomic(kaddr); |
29619809 KS |
769 | goto out_cp; |
770 | } | |
771 | ||
772 | list = &cp->cp_snapshot_list; | |
773 | next = le64_to_cpu(list->ssl_next); | |
774 | prev = le64_to_cpu(list->ssl_prev); | |
7b9c0976 | 775 | kunmap_atomic(kaddr); |
29619809 KS |
776 | |
777 | ret = nilfs_cpfile_get_header_block(cpfile, &header_bh); | |
778 | if (ret < 0) | |
779 | goto out_cp; | |
780 | if (next != 0) { | |
781 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, next, 0, | |
782 | &next_bh); | |
783 | if (ret < 0) | |
784 | goto out_header; | |
785 | } else { | |
786 | next_bh = header_bh; | |
787 | get_bh(next_bh); | |
788 | } | |
789 | if (prev != 0) { | |
790 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0, | |
791 | &prev_bh); | |
792 | if (ret < 0) | |
793 | goto out_next; | |
794 | } else { | |
795 | prev_bh = header_bh; | |
796 | get_bh(prev_bh); | |
797 | } | |
798 | ||
7b9c0976 | 799 | kaddr = kmap_atomic(next_bh->b_page); |
29619809 KS |
800 | list = nilfs_cpfile_block_get_snapshot_list( |
801 | cpfile, next, next_bh, kaddr); | |
802 | list->ssl_prev = cpu_to_le64(prev); | |
7b9c0976 | 803 | kunmap_atomic(kaddr); |
29619809 | 804 | |
7b9c0976 | 805 | kaddr = kmap_atomic(prev_bh->b_page); |
29619809 KS |
806 | list = nilfs_cpfile_block_get_snapshot_list( |
807 | cpfile, prev, prev_bh, kaddr); | |
808 | list->ssl_next = cpu_to_le64(next); | |
7b9c0976 | 809 | kunmap_atomic(kaddr); |
29619809 | 810 | |
7b9c0976 | 811 | kaddr = kmap_atomic(cp_bh->b_page); |
29619809 KS |
812 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr); |
813 | cp->cp_snapshot_list.ssl_next = cpu_to_le64(0); | |
814 | cp->cp_snapshot_list.ssl_prev = cpu_to_le64(0); | |
815 | nilfs_checkpoint_clear_snapshot(cp); | |
7b9c0976 | 816 | kunmap_atomic(kaddr); |
29619809 | 817 | |
7b9c0976 | 818 | kaddr = kmap_atomic(header_bh->b_page); |
29619809 KS |
819 | header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr); |
820 | le64_add_cpu(&header->ch_nsnapshots, -1); | |
7b9c0976 | 821 | kunmap_atomic(kaddr); |
29619809 | 822 | |
5fc7b141 RK |
823 | mark_buffer_dirty(next_bh); |
824 | mark_buffer_dirty(prev_bh); | |
825 | mark_buffer_dirty(cp_bh); | |
826 | mark_buffer_dirty(header_bh); | |
29619809 KS |
827 | nilfs_mdt_mark_dirty(cpfile); |
828 | ||
829 | brelse(prev_bh); | |
830 | ||
831 | out_next: | |
832 | brelse(next_bh); | |
833 | ||
834 | out_header: | |
835 | brelse(header_bh); | |
836 | ||
837 | out_cp: | |
838 | brelse(cp_bh); | |
839 | ||
840 | out_sem: | |
841 | up_write(&NILFS_MDT(cpfile)->mi_sem); | |
842 | return ret; | |
843 | } | |
844 | ||
845 | /** | |
846 | * nilfs_cpfile_is_snapshot - | |
847 | * @cpfile: inode of checkpoint file | |
848 | * @cno: checkpoint number | |
849 | * | |
850 | * Description: | |
851 | * | |
852 | * Return Value: On success, 1 is returned if the checkpoint specified by | |
853 | * @cno is a snapshot, or 0 if not. On error, one of the following negative | |
854 | * error codes is returned. | |
855 | * | |
856 | * %-EIO - I/O error. | |
857 | * | |
858 | * %-ENOMEM - Insufficient amount of memory available. | |
859 | * | |
860 | * %-ENOENT - No such checkpoint. | |
861 | */ | |
862 | int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno) | |
863 | { | |
864 | struct buffer_head *bh; | |
865 | struct nilfs_checkpoint *cp; | |
866 | void *kaddr; | |
867 | int ret; | |
868 | ||
43be0ec0 ZY |
869 | /* CP number is invalid if it's zero or larger than the |
870 | largest exist one.*/ | |
871 | if (cno == 0 || cno >= nilfs_mdt_cno(cpfile)) | |
872 | return -ENOENT; | |
29619809 KS |
873 | down_read(&NILFS_MDT(cpfile)->mi_sem); |
874 | ||
875 | ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh); | |
876 | if (ret < 0) | |
877 | goto out; | |
7b9c0976 | 878 | kaddr = kmap_atomic(bh->b_page); |
29619809 | 879 | cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr); |
43be0ec0 ZY |
880 | if (nilfs_checkpoint_invalid(cp)) |
881 | ret = -ENOENT; | |
882 | else | |
883 | ret = nilfs_checkpoint_snapshot(cp); | |
7b9c0976 | 884 | kunmap_atomic(kaddr); |
29619809 KS |
885 | brelse(bh); |
886 | ||
887 | out: | |
888 | up_read(&NILFS_MDT(cpfile)->mi_sem); | |
889 | return ret; | |
890 | } | |
891 | ||
892 | /** | |
893 | * nilfs_cpfile_change_cpmode - change checkpoint mode | |
894 | * @cpfile: inode of checkpoint file | |
895 | * @cno: checkpoint number | |
896 | * @status: mode of checkpoint | |
897 | * | |
898 | * Description: nilfs_change_cpmode() changes the mode of the checkpoint | |
899 | * specified by @cno. The mode @mode is NILFS_CHECKPOINT or NILFS_SNAPSHOT. | |
900 | * | |
901 | * Return Value: On success, 0 is returned. On error, one of the following | |
902 | * negative error codes is returned. | |
903 | * | |
904 | * %-EIO - I/O error. | |
905 | * | |
906 | * %-ENOMEM - Insufficient amount of memory available. | |
907 | * | |
908 | * %-ENOENT - No such checkpoint. | |
909 | */ | |
910 | int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode) | |
911 | { | |
29619809 KS |
912 | int ret; |
913 | ||
29619809 KS |
914 | switch (mode) { |
915 | case NILFS_CHECKPOINT: | |
032dbb3b RK |
916 | if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno)) |
917 | /* | |
918 | * Current implementation does not have to protect | |
919 | * plain read-only mounts since they are exclusive | |
920 | * with a read/write mount and are protected from the | |
921 | * cleaner. | |
922 | */ | |
29619809 | 923 | ret = -EBUSY; |
032dbb3b | 924 | else |
29619809 | 925 | ret = nilfs_cpfile_clear_snapshot(cpfile, cno); |
29619809 KS |
926 | return ret; |
927 | case NILFS_SNAPSHOT: | |
928 | return nilfs_cpfile_set_snapshot(cpfile, cno); | |
929 | default: | |
930 | return -EINVAL; | |
931 | } | |
932 | } | |
933 | ||
934 | /** | |
935 | * nilfs_cpfile_get_stat - get checkpoint statistics | |
936 | * @cpfile: inode of checkpoint file | |
937 | * @stat: pointer to a structure of checkpoint statistics | |
938 | * | |
939 | * Description: nilfs_cpfile_get_stat() returns information about checkpoints. | |
940 | * | |
941 | * Return Value: On success, 0 is returned, and checkpoints information is | |
942 | * stored in the place pointed by @stat. On error, one of the following | |
943 | * negative error codes is returned. | |
944 | * | |
945 | * %-EIO - I/O error. | |
946 | * | |
947 | * %-ENOMEM - Insufficient amount of memory available. | |
948 | */ | |
949 | int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat) | |
950 | { | |
951 | struct buffer_head *bh; | |
952 | struct nilfs_cpfile_header *header; | |
953 | void *kaddr; | |
954 | int ret; | |
955 | ||
956 | down_read(&NILFS_MDT(cpfile)->mi_sem); | |
957 | ||
958 | ret = nilfs_cpfile_get_header_block(cpfile, &bh); | |
959 | if (ret < 0) | |
960 | goto out_sem; | |
7b9c0976 | 961 | kaddr = kmap_atomic(bh->b_page); |
29619809 KS |
962 | header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr); |
963 | cpstat->cs_cno = nilfs_mdt_cno(cpfile); | |
964 | cpstat->cs_ncps = le64_to_cpu(header->ch_ncheckpoints); | |
965 | cpstat->cs_nsss = le64_to_cpu(header->ch_nsnapshots); | |
7b9c0976 | 966 | kunmap_atomic(kaddr); |
29619809 KS |
967 | brelse(bh); |
968 | ||
969 | out_sem: | |
970 | up_read(&NILFS_MDT(cpfile)->mi_sem); | |
971 | return ret; | |
972 | } | |
79739565 | 973 | |
8707df38 | 974 | /** |
f1e89c86 RK |
975 | * nilfs_cpfile_read - read or get cpfile inode |
976 | * @sb: super block instance | |
79739565 | 977 | * @cpsize: size of a checkpoint entry |
f1e89c86 RK |
978 | * @raw_inode: on-disk cpfile inode |
979 | * @inodep: buffer to store the inode | |
79739565 | 980 | */ |
f1e89c86 RK |
981 | int nilfs_cpfile_read(struct super_block *sb, size_t cpsize, |
982 | struct nilfs_inode *raw_inode, struct inode **inodep) | |
79739565 RK |
983 | { |
984 | struct inode *cpfile; | |
f1e89c86 | 985 | int err; |
79739565 | 986 | |
0ec060d1 RK |
987 | if (cpsize > sb->s_blocksize) { |
988 | printk(KERN_ERR | |
989 | "NILFS: too large checkpoint size: %zu bytes.\n", | |
990 | cpsize); | |
991 | return -EINVAL; | |
992 | } else if (cpsize < NILFS_MIN_CHECKPOINT_SIZE) { | |
993 | printk(KERN_ERR | |
994 | "NILFS: too small checkpoint size: %zu bytes.\n", | |
995 | cpsize); | |
996 | return -EINVAL; | |
997 | } | |
998 | ||
f1e89c86 RK |
999 | cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO); |
1000 | if (unlikely(!cpfile)) | |
1001 | return -ENOMEM; | |
1002 | if (!(cpfile->i_state & I_NEW)) | |
1003 | goto out; | |
1004 | ||
1005 | err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0); | |
1006 | if (err) | |
1007 | goto failed; | |
1008 | ||
1009 | nilfs_mdt_set_entry_size(cpfile, cpsize, | |
1010 | sizeof(struct nilfs_cpfile_header)); | |
1011 | ||
1012 | err = nilfs_read_inode_common(cpfile, raw_inode); | |
1013 | if (err) | |
1014 | goto failed; | |
1015 | ||
1016 | unlock_new_inode(cpfile); | |
1017 | out: | |
1018 | *inodep = cpfile; | |
1019 | return 0; | |
1020 | failed: | |
1021 | iget_failed(cpfile); | |
1022 | return err; | |
79739565 | 1023 | } |