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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>. | |
dda54f4b | 21 | * Rivised by Ryusuke Konishi <ryusuke@osrg.net>. |
6c98cd4e KS |
22 | */ |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/buffer_head.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/nilfs2_fs.h> | |
30 | #include "mdt.h" | |
31 | #include "sufile.h" | |
32 | ||
33 | ||
34 | static inline unsigned long | |
35 | nilfs_sufile_segment_usages_per_block(const struct inode *sufile) | |
36 | { | |
37 | return NILFS_MDT(sufile)->mi_entries_per_block; | |
38 | } | |
39 | ||
40 | static unsigned long | |
41 | nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum) | |
42 | { | |
43 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; | |
44 | do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); | |
45 | return (unsigned long)t; | |
46 | } | |
47 | ||
48 | static unsigned long | |
49 | nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum) | |
50 | { | |
51 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; | |
52 | return do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); | |
53 | } | |
54 | ||
55 | static unsigned long | |
56 | nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr, | |
57 | __u64 max) | |
58 | { | |
59 | return min_t(unsigned long, | |
60 | nilfs_sufile_segment_usages_per_block(sufile) - | |
61 | nilfs_sufile_get_offset(sufile, curr), | |
62 | max - curr + 1); | |
63 | } | |
64 | ||
65 | static inline struct nilfs_sufile_header * | |
66 | nilfs_sufile_block_get_header(const struct inode *sufile, | |
67 | struct buffer_head *bh, | |
68 | void *kaddr) | |
69 | { | |
70 | return kaddr + bh_offset(bh); | |
71 | } | |
72 | ||
73 | static struct nilfs_segment_usage * | |
74 | nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum, | |
75 | struct buffer_head *bh, void *kaddr) | |
76 | { | |
77 | return kaddr + bh_offset(bh) + | |
78 | nilfs_sufile_get_offset(sufile, segnum) * | |
79 | NILFS_MDT(sufile)->mi_entry_size; | |
80 | } | |
81 | ||
82 | static inline int nilfs_sufile_get_header_block(struct inode *sufile, | |
83 | struct buffer_head **bhp) | |
84 | { | |
85 | return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp); | |
86 | } | |
87 | ||
88 | static inline int | |
89 | nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum, | |
90 | int create, struct buffer_head **bhp) | |
91 | { | |
92 | return nilfs_mdt_get_block(sufile, | |
93 | nilfs_sufile_get_blkoff(sufile, segnum), | |
94 | create, NULL, bhp); | |
95 | } | |
96 | ||
a703018f RK |
97 | static void nilfs_sufile_mod_counter(struct buffer_head *header_bh, |
98 | u64 ncleanadd, u64 ndirtyadd) | |
99 | { | |
100 | struct nilfs_sufile_header *header; | |
101 | void *kaddr; | |
102 | ||
103 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
104 | header = kaddr + bh_offset(header_bh); | |
105 | le64_add_cpu(&header->sh_ncleansegs, ncleanadd); | |
106 | le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd); | |
107 | kunmap_atomic(kaddr, KM_USER0); | |
108 | ||
109 | nilfs_mdt_mark_buffer_dirty(header_bh); | |
110 | } | |
111 | ||
dda54f4b RK |
112 | /** |
113 | * nilfs_sufile_updatev - modify multiple segment usages at a time | |
114 | * @sufile: inode of segment usage file | |
115 | * @segnumv: array of segment numbers | |
116 | * @nsegs: size of @segnumv array | |
117 | * @create: creation flag | |
118 | * @ndone: place to store number of modified segments on @segnumv | |
119 | * @dofunc: primitive operation for the update | |
120 | * | |
121 | * Description: nilfs_sufile_updatev() repeatedly calls @dofunc | |
122 | * against the given array of segments. The @dofunc is called with | |
123 | * buffers of a header block and the sufile block in which the target | |
124 | * segment usage entry is contained. If @ndone is given, the number | |
125 | * of successfully modified segments from the head is stored in the | |
126 | * place @ndone points to. | |
127 | * | |
128 | * Return Value: On success, zero is returned. On error, one of the | |
129 | * following negative error codes is returned. | |
130 | * | |
131 | * %-EIO - I/O error. | |
132 | * | |
133 | * %-ENOMEM - Insufficient amount of memory available. | |
134 | * | |
135 | * %-ENOENT - Given segment usage is in hole block (may be returned if | |
136 | * @create is zero) | |
137 | * | |
138 | * %-EINVAL - Invalid segment usage number | |
139 | */ | |
140 | int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs, | |
141 | int create, size_t *ndone, | |
142 | void (*dofunc)(struct inode *, __u64, | |
143 | struct buffer_head *, | |
144 | struct buffer_head *)) | |
145 | { | |
146 | struct buffer_head *header_bh, *bh; | |
147 | unsigned long blkoff, prev_blkoff; | |
148 | __u64 *seg; | |
149 | size_t nerr = 0, n = 0; | |
150 | int ret = 0; | |
151 | ||
152 | if (unlikely(nsegs == 0)) | |
153 | goto out; | |
154 | ||
155 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
156 | for (seg = segnumv; seg < segnumv + nsegs; seg++) { | |
157 | if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) { | |
158 | printk(KERN_WARNING | |
159 | "%s: invalid segment number: %llu\n", __func__, | |
160 | (unsigned long long)*seg); | |
161 | nerr++; | |
162 | } | |
163 | } | |
164 | if (nerr > 0) { | |
165 | ret = -EINVAL; | |
166 | goto out_sem; | |
167 | } | |
168 | ||
169 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
170 | if (ret < 0) | |
171 | goto out_sem; | |
172 | ||
173 | seg = segnumv; | |
174 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); | |
175 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); | |
176 | if (ret < 0) | |
177 | goto out_header; | |
178 | ||
179 | for (;;) { | |
180 | dofunc(sufile, *seg, header_bh, bh); | |
181 | ||
182 | if (++seg >= segnumv + nsegs) | |
183 | break; | |
184 | prev_blkoff = blkoff; | |
185 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); | |
186 | if (blkoff == prev_blkoff) | |
187 | continue; | |
188 | ||
189 | /* get different block */ | |
190 | brelse(bh); | |
191 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); | |
192 | if (unlikely(ret < 0)) | |
193 | goto out_header; | |
194 | } | |
195 | brelse(bh); | |
196 | ||
197 | out_header: | |
198 | n = seg - segnumv; | |
199 | brelse(header_bh); | |
200 | out_sem: | |
201 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
202 | out: | |
203 | if (ndone) | |
204 | *ndone = n; | |
205 | return ret; | |
206 | } | |
207 | ||
a703018f RK |
208 | int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create, |
209 | void (*dofunc)(struct inode *, __u64, | |
210 | struct buffer_head *, | |
211 | struct buffer_head *)) | |
212 | { | |
213 | struct buffer_head *header_bh, *bh; | |
214 | int ret; | |
215 | ||
216 | if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) { | |
217 | printk(KERN_WARNING "%s: invalid segment number: %llu\n", | |
218 | __func__, (unsigned long long)segnum); | |
219 | return -EINVAL; | |
220 | } | |
221 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
222 | ||
223 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
224 | if (ret < 0) | |
225 | goto out_sem; | |
226 | ||
227 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh); | |
228 | if (!ret) { | |
229 | dofunc(sufile, segnum, header_bh, bh); | |
230 | brelse(bh); | |
231 | } | |
232 | brelse(header_bh); | |
233 | ||
234 | out_sem: | |
235 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
236 | return ret; | |
237 | } | |
238 | ||
6c98cd4e KS |
239 | /** |
240 | * nilfs_sufile_alloc - allocate a segment | |
241 | * @sufile: inode of segment usage file | |
242 | * @segnump: pointer to segment number | |
243 | * | |
244 | * Description: nilfs_sufile_alloc() allocates a clean segment. | |
245 | * | |
246 | * Return Value: On success, 0 is returned and the segment number of the | |
247 | * allocated segment is stored in the place pointed by @segnump. On error, one | |
248 | * of the following negative error codes is returned. | |
249 | * | |
250 | * %-EIO - I/O error. | |
251 | * | |
252 | * %-ENOMEM - Insufficient amount of memory available. | |
253 | * | |
254 | * %-ENOSPC - No clean segment left. | |
255 | */ | |
256 | int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump) | |
257 | { | |
258 | struct buffer_head *header_bh, *su_bh; | |
6c98cd4e KS |
259 | struct nilfs_sufile_header *header; |
260 | struct nilfs_segment_usage *su; | |
261 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; | |
262 | __u64 segnum, maxsegnum, last_alloc; | |
263 | void *kaddr; | |
264 | unsigned long nsegments, ncleansegs, nsus; | |
265 | int ret, i, j; | |
266 | ||
267 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
268 | ||
6c98cd4e KS |
269 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
270 | if (ret < 0) | |
271 | goto out_sem; | |
272 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
273 | header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr); | |
274 | ncleansegs = le64_to_cpu(header->sh_ncleansegs); | |
275 | last_alloc = le64_to_cpu(header->sh_last_alloc); | |
276 | kunmap_atomic(kaddr, KM_USER0); | |
277 | ||
278 | nsegments = nilfs_sufile_get_nsegments(sufile); | |
279 | segnum = last_alloc + 1; | |
280 | maxsegnum = nsegments - 1; | |
281 | for (i = 0; i < nsegments; i += nsus) { | |
282 | if (segnum >= nsegments) { | |
283 | /* wrap around */ | |
284 | segnum = 0; | |
285 | maxsegnum = last_alloc; | |
286 | } | |
287 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, | |
288 | &su_bh); | |
289 | if (ret < 0) | |
290 | goto out_header; | |
291 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
292 | su = nilfs_sufile_block_get_segment_usage( | |
293 | sufile, segnum, su_bh, kaddr); | |
294 | ||
295 | nsus = nilfs_sufile_segment_usages_in_block( | |
296 | sufile, segnum, maxsegnum); | |
297 | for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) { | |
298 | if (!nilfs_segment_usage_clean(su)) | |
299 | continue; | |
300 | /* found a clean segment */ | |
6c98cd4e KS |
301 | nilfs_segment_usage_set_dirty(su); |
302 | kunmap_atomic(kaddr, KM_USER0); | |
303 | ||
304 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
305 | header = nilfs_sufile_block_get_header( | |
306 | sufile, header_bh, kaddr); | |
307 | le64_add_cpu(&header->sh_ncleansegs, -1); | |
308 | le64_add_cpu(&header->sh_ndirtysegs, 1); | |
309 | header->sh_last_alloc = cpu_to_le64(segnum); | |
310 | kunmap_atomic(kaddr, KM_USER0); | |
311 | ||
312 | nilfs_mdt_mark_buffer_dirty(header_bh); | |
313 | nilfs_mdt_mark_buffer_dirty(su_bh); | |
314 | nilfs_mdt_mark_dirty(sufile); | |
315 | brelse(su_bh); | |
316 | *segnump = segnum; | |
317 | goto out_header; | |
318 | } | |
319 | ||
320 | kunmap_atomic(kaddr, KM_USER0); | |
321 | brelse(su_bh); | |
322 | } | |
323 | ||
324 | /* no segments left */ | |
325 | ret = -ENOSPC; | |
326 | ||
327 | out_header: | |
328 | brelse(header_bh); | |
329 | ||
330 | out_sem: | |
331 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
332 | return ret; | |
333 | } | |
334 | ||
a703018f RK |
335 | void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum, |
336 | struct buffer_head *header_bh, | |
337 | struct buffer_head *su_bh) | |
6c98cd4e | 338 | { |
6c98cd4e KS |
339 | struct nilfs_segment_usage *su; |
340 | void *kaddr; | |
6c98cd4e KS |
341 | |
342 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
a703018f | 343 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
1f5abe7e RK |
344 | if (unlikely(!nilfs_segment_usage_clean(su))) { |
345 | printk(KERN_WARNING "%s: segment %llu must be clean\n", | |
6c98cd4e | 346 | __func__, (unsigned long long)segnum); |
1f5abe7e | 347 | kunmap_atomic(kaddr, KM_USER0); |
a703018f | 348 | return; |
6c98cd4e KS |
349 | } |
350 | nilfs_segment_usage_set_dirty(su); | |
351 | kunmap_atomic(kaddr, KM_USER0); | |
352 | ||
a703018f | 353 | nilfs_sufile_mod_counter(header_bh, -1, 1); |
6c98cd4e KS |
354 | nilfs_mdt_mark_buffer_dirty(su_bh); |
355 | nilfs_mdt_mark_dirty(sufile); | |
6c98cd4e KS |
356 | } |
357 | ||
c85399c2 RK |
358 | void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum, |
359 | struct buffer_head *header_bh, | |
360 | struct buffer_head *su_bh) | |
361 | { | |
362 | struct nilfs_segment_usage *su; | |
363 | void *kaddr; | |
364 | int clean, dirty; | |
365 | ||
366 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
367 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); | |
368 | if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) && | |
369 | su->su_nblocks == cpu_to_le32(0)) { | |
370 | kunmap_atomic(kaddr, KM_USER0); | |
371 | return; | |
372 | } | |
373 | clean = nilfs_segment_usage_clean(su); | |
374 | dirty = nilfs_segment_usage_dirty(su); | |
375 | ||
376 | /* make the segment garbage */ | |
377 | su->su_lastmod = cpu_to_le64(0); | |
378 | su->su_nblocks = cpu_to_le32(0); | |
379 | su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY); | |
380 | kunmap_atomic(kaddr, KM_USER0); | |
381 | ||
382 | nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1); | |
383 | nilfs_mdt_mark_buffer_dirty(su_bh); | |
384 | nilfs_mdt_mark_dirty(sufile); | |
385 | } | |
386 | ||
a703018f RK |
387 | void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum, |
388 | struct buffer_head *header_bh, | |
389 | struct buffer_head *su_bh) | |
6c98cd4e | 390 | { |
6c98cd4e KS |
391 | struct nilfs_segment_usage *su; |
392 | void *kaddr; | |
a703018f | 393 | int sudirty; |
6c98cd4e | 394 | |
a703018f RK |
395 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
396 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); | |
397 | if (nilfs_segment_usage_clean(su)) { | |
398 | printk(KERN_WARNING "%s: segment %llu is already clean\n", | |
399 | __func__, (unsigned long long)segnum); | |
6c98cd4e | 400 | kunmap_atomic(kaddr, KM_USER0); |
a703018f | 401 | return; |
6c98cd4e | 402 | } |
a703018f RK |
403 | WARN_ON(nilfs_segment_usage_error(su)); |
404 | WARN_ON(!nilfs_segment_usage_dirty(su)); | |
6c98cd4e | 405 | |
a703018f RK |
406 | sudirty = nilfs_segment_usage_dirty(su); |
407 | nilfs_segment_usage_set_clean(su); | |
408 | kunmap_atomic(kaddr, KM_USER0); | |
409 | nilfs_mdt_mark_buffer_dirty(su_bh); | |
6c98cd4e | 410 | |
a703018f RK |
411 | nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0); |
412 | nilfs_mdt_mark_dirty(sufile); | |
6c98cd4e KS |
413 | } |
414 | ||
415 | /** | |
416 | * nilfs_sufile_get_segment_usage - get a segment usage | |
417 | * @sufile: inode of segment usage file | |
418 | * @segnum: segment number | |
419 | * @sup: pointer to segment usage | |
420 | * @bhp: pointer to buffer head | |
421 | * | |
422 | * Description: nilfs_sufile_get_segment_usage() acquires the segment usage | |
423 | * specified by @segnum. | |
424 | * | |
425 | * Return Value: On success, 0 is returned, and the segment usage and the | |
426 | * buffer head of the buffer on which the segment usage is located are stored | |
427 | * in the place pointed by @sup and @bhp, respectively. On error, one of the | |
428 | * following negative error codes is returned. | |
429 | * | |
430 | * %-EIO - I/O error. | |
431 | * | |
432 | * %-ENOMEM - Insufficient amount of memory available. | |
433 | * | |
434 | * %-EINVAL - Invalid segment usage number. | |
435 | */ | |
436 | int nilfs_sufile_get_segment_usage(struct inode *sufile, __u64 segnum, | |
437 | struct nilfs_segment_usage **sup, | |
438 | struct buffer_head **bhp) | |
439 | { | |
440 | struct buffer_head *bh; | |
441 | struct nilfs_segment_usage *su; | |
442 | void *kaddr; | |
443 | int ret; | |
444 | ||
445 | /* segnum is 0 origin */ | |
1f5abe7e RK |
446 | if (segnum >= nilfs_sufile_get_nsegments(sufile)) |
447 | return -EINVAL; | |
6c98cd4e KS |
448 | down_write(&NILFS_MDT(sufile)->mi_sem); |
449 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &bh); | |
450 | if (ret < 0) | |
451 | goto out_sem; | |
452 | kaddr = kmap(bh->b_page); | |
453 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr); | |
454 | if (nilfs_segment_usage_error(su)) { | |
455 | kunmap(bh->b_page); | |
456 | brelse(bh); | |
457 | ret = -EINVAL; | |
458 | goto out_sem; | |
459 | } | |
460 | ||
461 | if (sup != NULL) | |
462 | *sup = su; | |
463 | *bhp = bh; | |
464 | ||
465 | out_sem: | |
466 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
467 | return ret; | |
468 | } | |
469 | ||
470 | /** | |
471 | * nilfs_sufile_put_segment_usage - put a segment usage | |
472 | * @sufile: inode of segment usage file | |
473 | * @segnum: segment number | |
474 | * @bh: buffer head | |
475 | * | |
476 | * Description: nilfs_sufile_put_segment_usage() releases the segment usage | |
477 | * specified by @segnum. @bh must be the buffer head which have been returned | |
478 | * by a previous call to nilfs_sufile_get_segment_usage() with @segnum. | |
479 | */ | |
480 | void nilfs_sufile_put_segment_usage(struct inode *sufile, __u64 segnum, | |
481 | struct buffer_head *bh) | |
482 | { | |
483 | kunmap(bh->b_page); | |
484 | brelse(bh); | |
485 | } | |
486 | ||
487 | /** | |
488 | * nilfs_sufile_get_stat - get segment usage statistics | |
489 | * @sufile: inode of segment usage file | |
490 | * @stat: pointer to a structure of segment usage statistics | |
491 | * | |
492 | * Description: nilfs_sufile_get_stat() returns information about segment | |
493 | * usage. | |
494 | * | |
495 | * Return Value: On success, 0 is returned, and segment usage information is | |
496 | * stored in the place pointed by @stat. On error, one of the following | |
497 | * negative error codes is returned. | |
498 | * | |
499 | * %-EIO - I/O error. | |
500 | * | |
501 | * %-ENOMEM - Insufficient amount of memory available. | |
502 | */ | |
503 | int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat) | |
504 | { | |
505 | struct buffer_head *header_bh; | |
506 | struct nilfs_sufile_header *header; | |
2c2e52fc | 507 | struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs; |
6c98cd4e KS |
508 | void *kaddr; |
509 | int ret; | |
510 | ||
511 | down_read(&NILFS_MDT(sufile)->mi_sem); | |
512 | ||
513 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
514 | if (ret < 0) | |
515 | goto out_sem; | |
516 | ||
517 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
518 | header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr); | |
519 | sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile); | |
520 | sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs); | |
521 | sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs); | |
2c2e52fc RK |
522 | sustat->ss_ctime = nilfs->ns_ctime; |
523 | sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime; | |
524 | spin_lock(&nilfs->ns_last_segment_lock); | |
525 | sustat->ss_prot_seq = nilfs->ns_prot_seq; | |
526 | spin_unlock(&nilfs->ns_last_segment_lock); | |
6c98cd4e KS |
527 | kunmap_atomic(kaddr, KM_USER0); |
528 | brelse(header_bh); | |
529 | ||
530 | out_sem: | |
531 | up_read(&NILFS_MDT(sufile)->mi_sem); | |
532 | return ret; | |
533 | } | |
534 | ||
535 | /** | |
536 | * nilfs_sufile_get_ncleansegs - get the number of clean segments | |
537 | * @sufile: inode of segment usage file | |
538 | * @nsegsp: pointer to the number of clean segments | |
539 | * | |
540 | * Description: nilfs_sufile_get_ncleansegs() acquires the number of clean | |
541 | * segments. | |
542 | * | |
543 | * Return Value: On success, 0 is returned and the number of clean segments is | |
544 | * stored in the place pointed by @nsegsp. On error, one of the following | |
545 | * negative error codes is returned. | |
546 | * | |
547 | * %-EIO - I/O error. | |
548 | * | |
549 | * %-ENOMEM - Insufficient amount of memory available. | |
550 | */ | |
551 | int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp) | |
552 | { | |
553 | struct nilfs_sustat sustat; | |
554 | int ret; | |
555 | ||
556 | ret = nilfs_sufile_get_stat(sufile, &sustat); | |
557 | if (ret == 0) | |
558 | *nsegsp = sustat.ss_ncleansegs; | |
559 | return ret; | |
560 | } | |
561 | ||
a703018f RK |
562 | void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum, |
563 | struct buffer_head *header_bh, | |
564 | struct buffer_head *su_bh) | |
6c98cd4e | 565 | { |
6c98cd4e | 566 | struct nilfs_segment_usage *su; |
6c98cd4e | 567 | void *kaddr; |
a703018f | 568 | int suclean; |
6c98cd4e KS |
569 | |
570 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
571 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); | |
572 | if (nilfs_segment_usage_error(su)) { | |
573 | kunmap_atomic(kaddr, KM_USER0); | |
a703018f | 574 | return; |
6c98cd4e | 575 | } |
88072faf | 576 | suclean = nilfs_segment_usage_clean(su); |
6c98cd4e KS |
577 | nilfs_segment_usage_set_error(su); |
578 | kunmap_atomic(kaddr, KM_USER0); | |
6c98cd4e | 579 | |
a703018f RK |
580 | if (suclean) |
581 | nilfs_sufile_mod_counter(header_bh, -1, 0); | |
6c98cd4e KS |
582 | nilfs_mdt_mark_buffer_dirty(su_bh); |
583 | nilfs_mdt_mark_dirty(sufile); | |
6c98cd4e KS |
584 | } |
585 | ||
586 | /** | |
587 | * nilfs_sufile_get_suinfo - | |
588 | * @sufile: inode of segment usage file | |
589 | * @segnum: segment number to start looking | |
003ff182 RK |
590 | * @buf: array of suinfo |
591 | * @sisz: byte size of suinfo | |
6c98cd4e KS |
592 | * @nsi: size of suinfo array |
593 | * | |
594 | * Description: | |
595 | * | |
596 | * Return Value: On success, 0 is returned and .... On error, one of the | |
597 | * following negative error codes is returned. | |
598 | * | |
599 | * %-EIO - I/O error. | |
600 | * | |
601 | * %-ENOMEM - Insufficient amount of memory available. | |
602 | */ | |
003ff182 RK |
603 | ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf, |
604 | unsigned sisz, size_t nsi) | |
6c98cd4e KS |
605 | { |
606 | struct buffer_head *su_bh; | |
607 | struct nilfs_segment_usage *su; | |
003ff182 | 608 | struct nilfs_suinfo *si = buf; |
6c98cd4e | 609 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; |
cece5520 | 610 | struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs; |
6c98cd4e KS |
611 | void *kaddr; |
612 | unsigned long nsegs, segusages_per_block; | |
613 | ssize_t n; | |
614 | int ret, i, j; | |
615 | ||
616 | down_read(&NILFS_MDT(sufile)->mi_sem); | |
617 | ||
618 | segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile); | |
619 | nsegs = min_t(unsigned long, | |
620 | nilfs_sufile_get_nsegments(sufile) - segnum, | |
621 | nsi); | |
622 | for (i = 0; i < nsegs; i += n, segnum += n) { | |
623 | n = min_t(unsigned long, | |
624 | segusages_per_block - | |
625 | nilfs_sufile_get_offset(sufile, segnum), | |
626 | nsegs - i); | |
627 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, | |
628 | &su_bh); | |
629 | if (ret < 0) { | |
630 | if (ret != -ENOENT) | |
631 | goto out; | |
632 | /* hole */ | |
003ff182 RK |
633 | memset(si, 0, sisz * n); |
634 | si = (void *)si + sisz * n; | |
6c98cd4e KS |
635 | continue; |
636 | } | |
637 | ||
638 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
639 | su = nilfs_sufile_block_get_segment_usage( | |
640 | sufile, segnum, su_bh, kaddr); | |
003ff182 RK |
641 | for (j = 0; j < n; |
642 | j++, su = (void *)su + susz, si = (void *)si + sisz) { | |
643 | si->sui_lastmod = le64_to_cpu(su->su_lastmod); | |
644 | si->sui_nblocks = le32_to_cpu(su->su_nblocks); | |
645 | si->sui_flags = le32_to_cpu(su->su_flags) & | |
cece5520 | 646 | ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE); |
3efb55b4 | 647 | if (nilfs_segment_is_active(nilfs, segnum + j)) |
003ff182 | 648 | si->sui_flags |= |
cece5520 | 649 | (1UL << NILFS_SEGMENT_USAGE_ACTIVE); |
6c98cd4e KS |
650 | } |
651 | kunmap_atomic(kaddr, KM_USER0); | |
652 | brelse(su_bh); | |
653 | } | |
654 | ret = nsegs; | |
655 | ||
656 | out: | |
657 | up_read(&NILFS_MDT(sufile)->mi_sem); | |
658 | return ret; | |
659 | } |