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6c98cd4e KS |
1 | /* |
2 | * sufile.c - NILFS segment usage 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 "sufile.h" | |
31 | ||
32 | ||
33 | static inline unsigned long | |
34 | nilfs_sufile_segment_usages_per_block(const struct inode *sufile) | |
35 | { | |
36 | return NILFS_MDT(sufile)->mi_entries_per_block; | |
37 | } | |
38 | ||
39 | static unsigned long | |
40 | nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum) | |
41 | { | |
42 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; | |
43 | do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); | |
44 | return (unsigned long)t; | |
45 | } | |
46 | ||
47 | static unsigned long | |
48 | nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum) | |
49 | { | |
50 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; | |
51 | return do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); | |
52 | } | |
53 | ||
54 | static unsigned long | |
55 | nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr, | |
56 | __u64 max) | |
57 | { | |
58 | return min_t(unsigned long, | |
59 | nilfs_sufile_segment_usages_per_block(sufile) - | |
60 | nilfs_sufile_get_offset(sufile, curr), | |
61 | max - curr + 1); | |
62 | } | |
63 | ||
64 | static inline struct nilfs_sufile_header * | |
65 | nilfs_sufile_block_get_header(const struct inode *sufile, | |
66 | struct buffer_head *bh, | |
67 | void *kaddr) | |
68 | { | |
69 | return kaddr + bh_offset(bh); | |
70 | } | |
71 | ||
72 | static struct nilfs_segment_usage * | |
73 | nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum, | |
74 | struct buffer_head *bh, void *kaddr) | |
75 | { | |
76 | return kaddr + bh_offset(bh) + | |
77 | nilfs_sufile_get_offset(sufile, segnum) * | |
78 | NILFS_MDT(sufile)->mi_entry_size; | |
79 | } | |
80 | ||
81 | static inline int nilfs_sufile_get_header_block(struct inode *sufile, | |
82 | struct buffer_head **bhp) | |
83 | { | |
84 | return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp); | |
85 | } | |
86 | ||
87 | static inline int | |
88 | nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum, | |
89 | int create, struct buffer_head **bhp) | |
90 | { | |
91 | return nilfs_mdt_get_block(sufile, | |
92 | nilfs_sufile_get_blkoff(sufile, segnum), | |
93 | create, NULL, bhp); | |
94 | } | |
95 | ||
96 | /** | |
97 | * nilfs_sufile_alloc - allocate a segment | |
98 | * @sufile: inode of segment usage file | |
99 | * @segnump: pointer to segment number | |
100 | * | |
101 | * Description: nilfs_sufile_alloc() allocates a clean segment. | |
102 | * | |
103 | * Return Value: On success, 0 is returned and the segment number of the | |
104 | * allocated segment is stored in the place pointed by @segnump. On error, one | |
105 | * of the following negative error codes is returned. | |
106 | * | |
107 | * %-EIO - I/O error. | |
108 | * | |
109 | * %-ENOMEM - Insufficient amount of memory available. | |
110 | * | |
111 | * %-ENOSPC - No clean segment left. | |
112 | */ | |
113 | int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump) | |
114 | { | |
115 | struct buffer_head *header_bh, *su_bh; | |
116 | struct the_nilfs *nilfs; | |
117 | struct nilfs_sufile_header *header; | |
118 | struct nilfs_segment_usage *su; | |
119 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; | |
120 | __u64 segnum, maxsegnum, last_alloc; | |
121 | void *kaddr; | |
122 | unsigned long nsegments, ncleansegs, nsus; | |
123 | int ret, i, j; | |
124 | ||
125 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
126 | ||
127 | nilfs = NILFS_MDT(sufile)->mi_nilfs; | |
128 | ||
129 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
130 | if (ret < 0) | |
131 | goto out_sem; | |
132 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
133 | header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr); | |
134 | ncleansegs = le64_to_cpu(header->sh_ncleansegs); | |
135 | last_alloc = le64_to_cpu(header->sh_last_alloc); | |
136 | kunmap_atomic(kaddr, KM_USER0); | |
137 | ||
138 | nsegments = nilfs_sufile_get_nsegments(sufile); | |
139 | segnum = last_alloc + 1; | |
140 | maxsegnum = nsegments - 1; | |
141 | for (i = 0; i < nsegments; i += nsus) { | |
142 | if (segnum >= nsegments) { | |
143 | /* wrap around */ | |
144 | segnum = 0; | |
145 | maxsegnum = last_alloc; | |
146 | } | |
147 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, | |
148 | &su_bh); | |
149 | if (ret < 0) | |
150 | goto out_header; | |
151 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
152 | su = nilfs_sufile_block_get_segment_usage( | |
153 | sufile, segnum, su_bh, kaddr); | |
154 | ||
155 | nsus = nilfs_sufile_segment_usages_in_block( | |
156 | sufile, segnum, maxsegnum); | |
157 | for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) { | |
158 | if (!nilfs_segment_usage_clean(su)) | |
159 | continue; | |
160 | /* found a clean segment */ | |
6c98cd4e KS |
161 | nilfs_segment_usage_set_dirty(su); |
162 | kunmap_atomic(kaddr, KM_USER0); | |
163 | ||
164 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
165 | header = nilfs_sufile_block_get_header( | |
166 | sufile, header_bh, kaddr); | |
167 | le64_add_cpu(&header->sh_ncleansegs, -1); | |
168 | le64_add_cpu(&header->sh_ndirtysegs, 1); | |
169 | header->sh_last_alloc = cpu_to_le64(segnum); | |
170 | kunmap_atomic(kaddr, KM_USER0); | |
171 | ||
172 | nilfs_mdt_mark_buffer_dirty(header_bh); | |
173 | nilfs_mdt_mark_buffer_dirty(su_bh); | |
174 | nilfs_mdt_mark_dirty(sufile); | |
175 | brelse(su_bh); | |
176 | *segnump = segnum; | |
177 | goto out_header; | |
178 | } | |
179 | ||
180 | kunmap_atomic(kaddr, KM_USER0); | |
181 | brelse(su_bh); | |
182 | } | |
183 | ||
184 | /* no segments left */ | |
185 | ret = -ENOSPC; | |
186 | ||
187 | out_header: | |
188 | brelse(header_bh); | |
189 | ||
190 | out_sem: | |
191 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
192 | return ret; | |
193 | } | |
194 | ||
195 | /** | |
196 | * nilfs_sufile_cancel_free - | |
197 | * @sufile: inode of segment usage file | |
198 | * @segnum: segment number | |
199 | * | |
200 | * Description: | |
201 | * | |
202 | * Return Value: On success, 0 is returned. On error, one of the following | |
203 | * negative error codes is returned. | |
204 | * | |
205 | * %-EIO - I/O error. | |
206 | * | |
207 | * %-ENOMEM - Insufficient amount of memory available. | |
208 | */ | |
209 | int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum) | |
210 | { | |
211 | struct buffer_head *header_bh, *su_bh; | |
212 | struct the_nilfs *nilfs; | |
213 | struct nilfs_sufile_header *header; | |
214 | struct nilfs_segment_usage *su; | |
215 | void *kaddr; | |
216 | int ret; | |
217 | ||
218 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
219 | ||
220 | nilfs = NILFS_MDT(sufile)->mi_nilfs; | |
221 | ||
222 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
223 | if (ret < 0) | |
224 | goto out_sem; | |
225 | ||
226 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh); | |
227 | if (ret < 0) | |
228 | goto out_header; | |
229 | ||
230 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
231 | su = nilfs_sufile_block_get_segment_usage( | |
232 | sufile, segnum, su_bh, kaddr); | |
1f5abe7e RK |
233 | if (unlikely(!nilfs_segment_usage_clean(su))) { |
234 | printk(KERN_WARNING "%s: segment %llu must be clean\n", | |
6c98cd4e | 235 | __func__, (unsigned long long)segnum); |
1f5abe7e RK |
236 | kunmap_atomic(kaddr, KM_USER0); |
237 | goto out_su_bh; | |
6c98cd4e KS |
238 | } |
239 | nilfs_segment_usage_set_dirty(su); | |
240 | kunmap_atomic(kaddr, KM_USER0); | |
241 | ||
242 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
243 | header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr); | |
244 | le64_add_cpu(&header->sh_ncleansegs, -1); | |
245 | le64_add_cpu(&header->sh_ndirtysegs, 1); | |
246 | kunmap_atomic(kaddr, KM_USER0); | |
247 | ||
248 | nilfs_mdt_mark_buffer_dirty(header_bh); | |
249 | nilfs_mdt_mark_buffer_dirty(su_bh); | |
250 | nilfs_mdt_mark_dirty(sufile); | |
251 | ||
1f5abe7e | 252 | out_su_bh: |
6c98cd4e | 253 | brelse(su_bh); |
6c98cd4e KS |
254 | out_header: |
255 | brelse(header_bh); | |
6c98cd4e KS |
256 | out_sem: |
257 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
258 | return ret; | |
259 | } | |
260 | ||
261 | /** | |
262 | * nilfs_sufile_freev - free segments | |
263 | * @sufile: inode of segment usage file | |
264 | * @segnum: array of segment numbers | |
265 | * @nsegs: number of segments | |
266 | * | |
267 | * Description: nilfs_sufile_freev() frees segments specified by @segnum and | |
268 | * @nsegs, which must have been returned by a previous call to | |
269 | * nilfs_sufile_alloc(). | |
270 | * | |
271 | * Return Value: On success, 0 is returned. On error, one of the following | |
272 | * negative error codes is returned. | |
273 | * | |
274 | * %-EIO - I/O error. | |
275 | * | |
276 | * %-ENOMEM - Insufficient amount of memory available. | |
277 | */ | |
278 | #define NILFS_SUFILE_FREEV_PREALLOC 16 | |
279 | int nilfs_sufile_freev(struct inode *sufile, __u64 *segnum, size_t nsegs) | |
280 | { | |
281 | struct buffer_head *header_bh, **su_bh, | |
282 | *su_bh_prealloc[NILFS_SUFILE_FREEV_PREALLOC]; | |
283 | struct the_nilfs *nilfs; | |
284 | struct nilfs_sufile_header *header; | |
285 | struct nilfs_segment_usage *su; | |
286 | void *kaddr; | |
287 | int ret, i; | |
288 | ||
289 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
290 | ||
291 | nilfs = NILFS_MDT(sufile)->mi_nilfs; | |
292 | ||
293 | /* prepare resources */ | |
294 | if (nsegs <= NILFS_SUFILE_FREEV_PREALLOC) | |
295 | su_bh = su_bh_prealloc; | |
296 | else { | |
297 | su_bh = kmalloc(sizeof(*su_bh) * nsegs, GFP_NOFS); | |
298 | if (su_bh == NULL) { | |
299 | ret = -ENOMEM; | |
300 | goto out_sem; | |
301 | } | |
302 | } | |
303 | ||
304 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
305 | if (ret < 0) | |
306 | goto out_su_bh; | |
307 | for (i = 0; i < nsegs; i++) { | |
308 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum[i], | |
309 | 0, &su_bh[i]); | |
310 | if (ret < 0) | |
311 | goto out_bh; | |
312 | } | |
313 | ||
314 | /* free segments */ | |
315 | for (i = 0; i < nsegs; i++) { | |
316 | kaddr = kmap_atomic(su_bh[i]->b_page, KM_USER0); | |
317 | su = nilfs_sufile_block_get_segment_usage( | |
318 | sufile, segnum[i], su_bh[i], kaddr); | |
1f5abe7e | 319 | WARN_ON(nilfs_segment_usage_error(su)); |
6c98cd4e KS |
320 | nilfs_segment_usage_set_clean(su); |
321 | kunmap_atomic(kaddr, KM_USER0); | |
322 | nilfs_mdt_mark_buffer_dirty(su_bh[i]); | |
323 | } | |
324 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
325 | header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr); | |
326 | le64_add_cpu(&header->sh_ncleansegs, nsegs); | |
327 | le64_add_cpu(&header->sh_ndirtysegs, -(u64)nsegs); | |
328 | kunmap_atomic(kaddr, KM_USER0); | |
329 | nilfs_mdt_mark_buffer_dirty(header_bh); | |
330 | nilfs_mdt_mark_dirty(sufile); | |
331 | ||
332 | out_bh: | |
333 | for (i--; i >= 0; i--) | |
334 | brelse(su_bh[i]); | |
335 | brelse(header_bh); | |
336 | ||
337 | out_su_bh: | |
338 | if (su_bh != su_bh_prealloc) | |
339 | kfree(su_bh); | |
340 | ||
341 | out_sem: | |
342 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
343 | return ret; | |
344 | } | |
345 | ||
346 | /** | |
347 | * nilfs_sufile_free - | |
348 | * @sufile: | |
349 | * @segnum: | |
350 | */ | |
351 | int nilfs_sufile_free(struct inode *sufile, __u64 segnum) | |
352 | { | |
353 | return nilfs_sufile_freev(sufile, &segnum, 1); | |
354 | } | |
355 | ||
356 | /** | |
357 | * nilfs_sufile_get_segment_usage - get a segment usage | |
358 | * @sufile: inode of segment usage file | |
359 | * @segnum: segment number | |
360 | * @sup: pointer to segment usage | |
361 | * @bhp: pointer to buffer head | |
362 | * | |
363 | * Description: nilfs_sufile_get_segment_usage() acquires the segment usage | |
364 | * specified by @segnum. | |
365 | * | |
366 | * Return Value: On success, 0 is returned, and the segment usage and the | |
367 | * buffer head of the buffer on which the segment usage is located are stored | |
368 | * in the place pointed by @sup and @bhp, respectively. On error, one of the | |
369 | * following negative error codes is returned. | |
370 | * | |
371 | * %-EIO - I/O error. | |
372 | * | |
373 | * %-ENOMEM - Insufficient amount of memory available. | |
374 | * | |
375 | * %-EINVAL - Invalid segment usage number. | |
376 | */ | |
377 | int nilfs_sufile_get_segment_usage(struct inode *sufile, __u64 segnum, | |
378 | struct nilfs_segment_usage **sup, | |
379 | struct buffer_head **bhp) | |
380 | { | |
381 | struct buffer_head *bh; | |
382 | struct nilfs_segment_usage *su; | |
383 | void *kaddr; | |
384 | int ret; | |
385 | ||
386 | /* segnum is 0 origin */ | |
1f5abe7e RK |
387 | if (segnum >= nilfs_sufile_get_nsegments(sufile)) |
388 | return -EINVAL; | |
6c98cd4e KS |
389 | down_write(&NILFS_MDT(sufile)->mi_sem); |
390 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &bh); | |
391 | if (ret < 0) | |
392 | goto out_sem; | |
393 | kaddr = kmap(bh->b_page); | |
394 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr); | |
395 | if (nilfs_segment_usage_error(su)) { | |
396 | kunmap(bh->b_page); | |
397 | brelse(bh); | |
398 | ret = -EINVAL; | |
399 | goto out_sem; | |
400 | } | |
401 | ||
402 | if (sup != NULL) | |
403 | *sup = su; | |
404 | *bhp = bh; | |
405 | ||
406 | out_sem: | |
407 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
408 | return ret; | |
409 | } | |
410 | ||
411 | /** | |
412 | * nilfs_sufile_put_segment_usage - put a segment usage | |
413 | * @sufile: inode of segment usage file | |
414 | * @segnum: segment number | |
415 | * @bh: buffer head | |
416 | * | |
417 | * Description: nilfs_sufile_put_segment_usage() releases the segment usage | |
418 | * specified by @segnum. @bh must be the buffer head which have been returned | |
419 | * by a previous call to nilfs_sufile_get_segment_usage() with @segnum. | |
420 | */ | |
421 | void nilfs_sufile_put_segment_usage(struct inode *sufile, __u64 segnum, | |
422 | struct buffer_head *bh) | |
423 | { | |
424 | kunmap(bh->b_page); | |
425 | brelse(bh); | |
426 | } | |
427 | ||
428 | /** | |
429 | * nilfs_sufile_get_stat - get segment usage statistics | |
430 | * @sufile: inode of segment usage file | |
431 | * @stat: pointer to a structure of segment usage statistics | |
432 | * | |
433 | * Description: nilfs_sufile_get_stat() returns information about segment | |
434 | * usage. | |
435 | * | |
436 | * Return Value: On success, 0 is returned, and segment usage information is | |
437 | * stored in the place pointed by @stat. On error, one of the following | |
438 | * negative error codes is returned. | |
439 | * | |
440 | * %-EIO - I/O error. | |
441 | * | |
442 | * %-ENOMEM - Insufficient amount of memory available. | |
443 | */ | |
444 | int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat) | |
445 | { | |
446 | struct buffer_head *header_bh; | |
447 | struct nilfs_sufile_header *header; | |
2c2e52fc | 448 | struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs; |
6c98cd4e KS |
449 | void *kaddr; |
450 | int ret; | |
451 | ||
452 | down_read(&NILFS_MDT(sufile)->mi_sem); | |
453 | ||
454 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
455 | if (ret < 0) | |
456 | goto out_sem; | |
457 | ||
458 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
459 | header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr); | |
460 | sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile); | |
461 | sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs); | |
462 | sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs); | |
2c2e52fc RK |
463 | sustat->ss_ctime = nilfs->ns_ctime; |
464 | sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime; | |
465 | spin_lock(&nilfs->ns_last_segment_lock); | |
466 | sustat->ss_prot_seq = nilfs->ns_prot_seq; | |
467 | spin_unlock(&nilfs->ns_last_segment_lock); | |
6c98cd4e KS |
468 | kunmap_atomic(kaddr, KM_USER0); |
469 | brelse(header_bh); | |
470 | ||
471 | out_sem: | |
472 | up_read(&NILFS_MDT(sufile)->mi_sem); | |
473 | return ret; | |
474 | } | |
475 | ||
476 | /** | |
477 | * nilfs_sufile_get_ncleansegs - get the number of clean segments | |
478 | * @sufile: inode of segment usage file | |
479 | * @nsegsp: pointer to the number of clean segments | |
480 | * | |
481 | * Description: nilfs_sufile_get_ncleansegs() acquires the number of clean | |
482 | * segments. | |
483 | * | |
484 | * Return Value: On success, 0 is returned and the number of clean segments is | |
485 | * stored in the place pointed by @nsegsp. On error, one of the following | |
486 | * negative error codes is returned. | |
487 | * | |
488 | * %-EIO - I/O error. | |
489 | * | |
490 | * %-ENOMEM - Insufficient amount of memory available. | |
491 | */ | |
492 | int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp) | |
493 | { | |
494 | struct nilfs_sustat sustat; | |
495 | int ret; | |
496 | ||
497 | ret = nilfs_sufile_get_stat(sufile, &sustat); | |
498 | if (ret == 0) | |
499 | *nsegsp = sustat.ss_ncleansegs; | |
500 | return ret; | |
501 | } | |
502 | ||
503 | /** | |
504 | * nilfs_sufile_set_error - mark a segment as erroneous | |
505 | * @sufile: inode of segment usage file | |
506 | * @segnum: segment number | |
507 | * | |
508 | * Description: nilfs_sufile_set_error() marks the segment specified by | |
509 | * @segnum as erroneous. The error segment will never be used again. | |
510 | * | |
511 | * Return Value: On success, 0 is returned. On error, one of the following | |
512 | * negative error codes is returned. | |
513 | * | |
514 | * %-EIO - I/O error. | |
515 | * | |
516 | * %-ENOMEM - Insufficient amount of memory available. | |
1f5abe7e RK |
517 | * |
518 | * %-EINVAL - Invalid segment usage number. | |
6c98cd4e KS |
519 | */ |
520 | int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum) | |
521 | { | |
522 | struct buffer_head *header_bh, *su_bh; | |
523 | struct nilfs_segment_usage *su; | |
524 | struct nilfs_sufile_header *header; | |
525 | void *kaddr; | |
526 | int ret; | |
527 | ||
1f5abe7e RK |
528 | if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) { |
529 | printk(KERN_WARNING "%s: invalid segment number: %llu\n", | |
530 | __func__, (unsigned long long)segnum); | |
531 | return -EINVAL; | |
532 | } | |
6c98cd4e KS |
533 | down_write(&NILFS_MDT(sufile)->mi_sem); |
534 | ||
535 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
536 | if (ret < 0) | |
537 | goto out_sem; | |
538 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh); | |
539 | if (ret < 0) | |
540 | goto out_header; | |
541 | ||
542 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
543 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); | |
544 | if (nilfs_segment_usage_error(su)) { | |
545 | kunmap_atomic(kaddr, KM_USER0); | |
546 | brelse(su_bh); | |
547 | goto out_header; | |
548 | } | |
549 | ||
550 | nilfs_segment_usage_set_error(su); | |
551 | kunmap_atomic(kaddr, KM_USER0); | |
552 | brelse(su_bh); | |
553 | ||
554 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
555 | header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr); | |
556 | le64_add_cpu(&header->sh_ndirtysegs, -1); | |
557 | kunmap_atomic(kaddr, KM_USER0); | |
558 | nilfs_mdt_mark_buffer_dirty(header_bh); | |
559 | nilfs_mdt_mark_buffer_dirty(su_bh); | |
560 | nilfs_mdt_mark_dirty(sufile); | |
561 | brelse(su_bh); | |
562 | ||
563 | out_header: | |
564 | brelse(header_bh); | |
565 | ||
566 | out_sem: | |
567 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
568 | return ret; | |
569 | } | |
570 | ||
571 | /** | |
572 | * nilfs_sufile_get_suinfo - | |
573 | * @sufile: inode of segment usage file | |
574 | * @segnum: segment number to start looking | |
575 | * @si: array of suinfo | |
576 | * @nsi: size of suinfo array | |
577 | * | |
578 | * Description: | |
579 | * | |
580 | * Return Value: On success, 0 is returned and .... On error, one of the | |
581 | * following negative error codes is returned. | |
582 | * | |
583 | * %-EIO - I/O error. | |
584 | * | |
585 | * %-ENOMEM - Insufficient amount of memory available. | |
586 | */ | |
587 | ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, | |
588 | struct nilfs_suinfo *si, size_t nsi) | |
589 | { | |
590 | struct buffer_head *su_bh; | |
591 | struct nilfs_segment_usage *su; | |
592 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; | |
cece5520 | 593 | struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs; |
6c98cd4e KS |
594 | void *kaddr; |
595 | unsigned long nsegs, segusages_per_block; | |
596 | ssize_t n; | |
597 | int ret, i, j; | |
598 | ||
599 | down_read(&NILFS_MDT(sufile)->mi_sem); | |
600 | ||
601 | segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile); | |
602 | nsegs = min_t(unsigned long, | |
603 | nilfs_sufile_get_nsegments(sufile) - segnum, | |
604 | nsi); | |
605 | for (i = 0; i < nsegs; i += n, segnum += n) { | |
606 | n = min_t(unsigned long, | |
607 | segusages_per_block - | |
608 | nilfs_sufile_get_offset(sufile, segnum), | |
609 | nsegs - i); | |
610 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, | |
611 | &su_bh); | |
612 | if (ret < 0) { | |
613 | if (ret != -ENOENT) | |
614 | goto out; | |
615 | /* hole */ | |
616 | memset(&si[i], 0, sizeof(struct nilfs_suinfo) * n); | |
617 | continue; | |
618 | } | |
619 | ||
620 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
621 | su = nilfs_sufile_block_get_segment_usage( | |
622 | sufile, segnum, su_bh, kaddr); | |
623 | for (j = 0; j < n; j++, su = (void *)su + susz) { | |
624 | si[i + j].sui_lastmod = le64_to_cpu(su->su_lastmod); | |
625 | si[i + j].sui_nblocks = le32_to_cpu(su->su_nblocks); | |
cece5520 RK |
626 | si[i + j].sui_flags = le32_to_cpu(su->su_flags) & |
627 | ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE); | |
3efb55b4 | 628 | if (nilfs_segment_is_active(nilfs, segnum + j)) |
cece5520 RK |
629 | si[i + j].sui_flags |= |
630 | (1UL << NILFS_SEGMENT_USAGE_ACTIVE); | |
6c98cd4e KS |
631 | } |
632 | kunmap_atomic(kaddr, KM_USER0); | |
633 | brelse(su_bh); | |
634 | } | |
635 | ret = nsegs; | |
636 | ||
637 | out: | |
638 | up_read(&NILFS_MDT(sufile)->mi_sem); | |
639 | return ret; | |
640 | } |