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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 | ||
aa474a22 RK |
34 | struct nilfs_sufile_info { |
35 | struct nilfs_mdt_info mi; | |
36 | unsigned long ncleansegs; | |
37 | }; | |
38 | ||
39 | static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile) | |
40 | { | |
41 | return (struct nilfs_sufile_info *)NILFS_MDT(sufile); | |
42 | } | |
43 | ||
6c98cd4e KS |
44 | static inline unsigned long |
45 | nilfs_sufile_segment_usages_per_block(const struct inode *sufile) | |
46 | { | |
47 | return NILFS_MDT(sufile)->mi_entries_per_block; | |
48 | } | |
49 | ||
50 | static unsigned long | |
51 | nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum) | |
52 | { | |
53 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; | |
54 | do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); | |
55 | return (unsigned long)t; | |
56 | } | |
57 | ||
58 | static unsigned long | |
59 | nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum) | |
60 | { | |
61 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; | |
62 | return do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); | |
63 | } | |
64 | ||
65 | static unsigned long | |
66 | nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr, | |
67 | __u64 max) | |
68 | { | |
69 | return min_t(unsigned long, | |
70 | nilfs_sufile_segment_usages_per_block(sufile) - | |
71 | nilfs_sufile_get_offset(sufile, curr), | |
72 | max - curr + 1); | |
73 | } | |
74 | ||
6c98cd4e KS |
75 | static struct nilfs_segment_usage * |
76 | nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum, | |
77 | struct buffer_head *bh, void *kaddr) | |
78 | { | |
79 | return kaddr + bh_offset(bh) + | |
80 | nilfs_sufile_get_offset(sufile, segnum) * | |
81 | NILFS_MDT(sufile)->mi_entry_size; | |
82 | } | |
83 | ||
84 | static inline int nilfs_sufile_get_header_block(struct inode *sufile, | |
85 | struct buffer_head **bhp) | |
86 | { | |
87 | return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp); | |
88 | } | |
89 | ||
90 | static inline int | |
91 | nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum, | |
92 | int create, struct buffer_head **bhp) | |
93 | { | |
94 | return nilfs_mdt_get_block(sufile, | |
95 | nilfs_sufile_get_blkoff(sufile, segnum), | |
96 | create, NULL, bhp); | |
97 | } | |
98 | ||
a703018f RK |
99 | static void nilfs_sufile_mod_counter(struct buffer_head *header_bh, |
100 | u64 ncleanadd, u64 ndirtyadd) | |
101 | { | |
102 | struct nilfs_sufile_header *header; | |
103 | void *kaddr; | |
104 | ||
105 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
106 | header = kaddr + bh_offset(header_bh); | |
107 | le64_add_cpu(&header->sh_ncleansegs, ncleanadd); | |
108 | le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd); | |
109 | kunmap_atomic(kaddr, KM_USER0); | |
110 | ||
111 | nilfs_mdt_mark_buffer_dirty(header_bh); | |
112 | } | |
113 | ||
dda54f4b RK |
114 | /** |
115 | * nilfs_sufile_updatev - modify multiple segment usages at a time | |
116 | * @sufile: inode of segment usage file | |
117 | * @segnumv: array of segment numbers | |
118 | * @nsegs: size of @segnumv array | |
119 | * @create: creation flag | |
120 | * @ndone: place to store number of modified segments on @segnumv | |
121 | * @dofunc: primitive operation for the update | |
122 | * | |
123 | * Description: nilfs_sufile_updatev() repeatedly calls @dofunc | |
124 | * against the given array of segments. The @dofunc is called with | |
125 | * buffers of a header block and the sufile block in which the target | |
126 | * segment usage entry is contained. If @ndone is given, the number | |
127 | * of successfully modified segments from the head is stored in the | |
128 | * place @ndone points to. | |
129 | * | |
130 | * Return Value: On success, zero is returned. On error, one of the | |
131 | * following negative error codes is returned. | |
132 | * | |
133 | * %-EIO - I/O error. | |
134 | * | |
135 | * %-ENOMEM - Insufficient amount of memory available. | |
136 | * | |
137 | * %-ENOENT - Given segment usage is in hole block (may be returned if | |
138 | * @create is zero) | |
139 | * | |
140 | * %-EINVAL - Invalid segment usage number | |
141 | */ | |
142 | int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs, | |
143 | int create, size_t *ndone, | |
144 | void (*dofunc)(struct inode *, __u64, | |
145 | struct buffer_head *, | |
146 | struct buffer_head *)) | |
147 | { | |
148 | struct buffer_head *header_bh, *bh; | |
149 | unsigned long blkoff, prev_blkoff; | |
150 | __u64 *seg; | |
151 | size_t nerr = 0, n = 0; | |
152 | int ret = 0; | |
153 | ||
154 | if (unlikely(nsegs == 0)) | |
155 | goto out; | |
156 | ||
157 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
158 | for (seg = segnumv; seg < segnumv + nsegs; seg++) { | |
159 | if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) { | |
160 | printk(KERN_WARNING | |
161 | "%s: invalid segment number: %llu\n", __func__, | |
162 | (unsigned long long)*seg); | |
163 | nerr++; | |
164 | } | |
165 | } | |
166 | if (nerr > 0) { | |
167 | ret = -EINVAL; | |
168 | goto out_sem; | |
169 | } | |
170 | ||
171 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
172 | if (ret < 0) | |
173 | goto out_sem; | |
174 | ||
175 | seg = segnumv; | |
176 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); | |
177 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); | |
178 | if (ret < 0) | |
179 | goto out_header; | |
180 | ||
181 | for (;;) { | |
182 | dofunc(sufile, *seg, header_bh, bh); | |
183 | ||
184 | if (++seg >= segnumv + nsegs) | |
185 | break; | |
186 | prev_blkoff = blkoff; | |
187 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); | |
188 | if (blkoff == prev_blkoff) | |
189 | continue; | |
190 | ||
191 | /* get different block */ | |
192 | brelse(bh); | |
193 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); | |
194 | if (unlikely(ret < 0)) | |
195 | goto out_header; | |
196 | } | |
197 | brelse(bh); | |
198 | ||
199 | out_header: | |
200 | n = seg - segnumv; | |
201 | brelse(header_bh); | |
202 | out_sem: | |
203 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
204 | out: | |
205 | if (ndone) | |
206 | *ndone = n; | |
207 | return ret; | |
208 | } | |
209 | ||
a703018f RK |
210 | int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create, |
211 | void (*dofunc)(struct inode *, __u64, | |
212 | struct buffer_head *, | |
213 | struct buffer_head *)) | |
214 | { | |
215 | struct buffer_head *header_bh, *bh; | |
216 | int ret; | |
217 | ||
218 | if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) { | |
219 | printk(KERN_WARNING "%s: invalid segment number: %llu\n", | |
220 | __func__, (unsigned long long)segnum); | |
221 | return -EINVAL; | |
222 | } | |
223 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
224 | ||
225 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
226 | if (ret < 0) | |
227 | goto out_sem; | |
228 | ||
229 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh); | |
230 | if (!ret) { | |
231 | dofunc(sufile, segnum, header_bh, bh); | |
232 | brelse(bh); | |
233 | } | |
234 | brelse(header_bh); | |
235 | ||
236 | out_sem: | |
237 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
238 | return ret; | |
239 | } | |
240 | ||
6c98cd4e KS |
241 | /** |
242 | * nilfs_sufile_alloc - allocate a segment | |
243 | * @sufile: inode of segment usage file | |
244 | * @segnump: pointer to segment number | |
245 | * | |
246 | * Description: nilfs_sufile_alloc() allocates a clean segment. | |
247 | * | |
248 | * Return Value: On success, 0 is returned and the segment number of the | |
249 | * allocated segment is stored in the place pointed by @segnump. On error, one | |
250 | * of the following negative error codes is returned. | |
251 | * | |
252 | * %-EIO - I/O error. | |
253 | * | |
254 | * %-ENOMEM - Insufficient amount of memory available. | |
255 | * | |
256 | * %-ENOSPC - No clean segment left. | |
257 | */ | |
258 | int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump) | |
259 | { | |
260 | struct buffer_head *header_bh, *su_bh; | |
6c98cd4e KS |
261 | struct nilfs_sufile_header *header; |
262 | struct nilfs_segment_usage *su; | |
263 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; | |
264 | __u64 segnum, maxsegnum, last_alloc; | |
265 | void *kaddr; | |
266 | unsigned long nsegments, ncleansegs, nsus; | |
267 | int ret, i, j; | |
268 | ||
269 | down_write(&NILFS_MDT(sufile)->mi_sem); | |
270 | ||
6c98cd4e KS |
271 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
272 | if (ret < 0) | |
273 | goto out_sem; | |
274 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
7b16c8a2 | 275 | header = kaddr + bh_offset(header_bh); |
6c98cd4e KS |
276 | ncleansegs = le64_to_cpu(header->sh_ncleansegs); |
277 | last_alloc = le64_to_cpu(header->sh_last_alloc); | |
278 | kunmap_atomic(kaddr, KM_USER0); | |
279 | ||
280 | nsegments = nilfs_sufile_get_nsegments(sufile); | |
281 | segnum = last_alloc + 1; | |
282 | maxsegnum = nsegments - 1; | |
283 | for (i = 0; i < nsegments; i += nsus) { | |
284 | if (segnum >= nsegments) { | |
285 | /* wrap around */ | |
286 | segnum = 0; | |
287 | maxsegnum = last_alloc; | |
288 | } | |
289 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, | |
290 | &su_bh); | |
291 | if (ret < 0) | |
292 | goto out_header; | |
293 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
294 | su = nilfs_sufile_block_get_segment_usage( | |
295 | sufile, segnum, su_bh, kaddr); | |
296 | ||
297 | nsus = nilfs_sufile_segment_usages_in_block( | |
298 | sufile, segnum, maxsegnum); | |
299 | for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) { | |
300 | if (!nilfs_segment_usage_clean(su)) | |
301 | continue; | |
302 | /* found a clean segment */ | |
6c98cd4e KS |
303 | nilfs_segment_usage_set_dirty(su); |
304 | kunmap_atomic(kaddr, KM_USER0); | |
305 | ||
306 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
7b16c8a2 | 307 | header = kaddr + bh_offset(header_bh); |
6c98cd4e KS |
308 | le64_add_cpu(&header->sh_ncleansegs, -1); |
309 | le64_add_cpu(&header->sh_ndirtysegs, 1); | |
310 | header->sh_last_alloc = cpu_to_le64(segnum); | |
311 | kunmap_atomic(kaddr, KM_USER0); | |
312 | ||
aa474a22 | 313 | NILFS_SUI(sufile)->ncleansegs--; |
6c98cd4e KS |
314 | nilfs_mdt_mark_buffer_dirty(header_bh); |
315 | nilfs_mdt_mark_buffer_dirty(su_bh); | |
316 | nilfs_mdt_mark_dirty(sufile); | |
317 | brelse(su_bh); | |
318 | *segnump = segnum; | |
319 | goto out_header; | |
320 | } | |
321 | ||
322 | kunmap_atomic(kaddr, KM_USER0); | |
323 | brelse(su_bh); | |
324 | } | |
325 | ||
326 | /* no segments left */ | |
327 | ret = -ENOSPC; | |
328 | ||
329 | out_header: | |
330 | brelse(header_bh); | |
331 | ||
332 | out_sem: | |
333 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
334 | return ret; | |
335 | } | |
336 | ||
a703018f RK |
337 | void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum, |
338 | struct buffer_head *header_bh, | |
339 | struct buffer_head *su_bh) | |
6c98cd4e | 340 | { |
6c98cd4e KS |
341 | struct nilfs_segment_usage *su; |
342 | void *kaddr; | |
6c98cd4e KS |
343 | |
344 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
a703018f | 345 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
1f5abe7e RK |
346 | if (unlikely(!nilfs_segment_usage_clean(su))) { |
347 | printk(KERN_WARNING "%s: segment %llu must be clean\n", | |
6c98cd4e | 348 | __func__, (unsigned long long)segnum); |
1f5abe7e | 349 | kunmap_atomic(kaddr, KM_USER0); |
a703018f | 350 | return; |
6c98cd4e KS |
351 | } |
352 | nilfs_segment_usage_set_dirty(su); | |
353 | kunmap_atomic(kaddr, KM_USER0); | |
354 | ||
a703018f | 355 | nilfs_sufile_mod_counter(header_bh, -1, 1); |
aa474a22 RK |
356 | NILFS_SUI(sufile)->ncleansegs--; |
357 | ||
6c98cd4e KS |
358 | nilfs_mdt_mark_buffer_dirty(su_bh); |
359 | nilfs_mdt_mark_dirty(sufile); | |
6c98cd4e KS |
360 | } |
361 | ||
c85399c2 RK |
362 | void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum, |
363 | struct buffer_head *header_bh, | |
364 | struct buffer_head *su_bh) | |
365 | { | |
366 | struct nilfs_segment_usage *su; | |
367 | void *kaddr; | |
368 | int clean, dirty; | |
369 | ||
370 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
371 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); | |
372 | if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) && | |
373 | su->su_nblocks == cpu_to_le32(0)) { | |
374 | kunmap_atomic(kaddr, KM_USER0); | |
375 | return; | |
376 | } | |
377 | clean = nilfs_segment_usage_clean(su); | |
378 | dirty = nilfs_segment_usage_dirty(su); | |
379 | ||
380 | /* make the segment garbage */ | |
381 | su->su_lastmod = cpu_to_le64(0); | |
382 | su->su_nblocks = cpu_to_le32(0); | |
383 | su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY); | |
384 | kunmap_atomic(kaddr, KM_USER0); | |
385 | ||
386 | nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1); | |
aa474a22 RK |
387 | NILFS_SUI(sufile)->ncleansegs -= clean; |
388 | ||
c85399c2 RK |
389 | nilfs_mdt_mark_buffer_dirty(su_bh); |
390 | nilfs_mdt_mark_dirty(sufile); | |
391 | } | |
392 | ||
a703018f RK |
393 | void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum, |
394 | struct buffer_head *header_bh, | |
395 | struct buffer_head *su_bh) | |
6c98cd4e | 396 | { |
6c98cd4e KS |
397 | struct nilfs_segment_usage *su; |
398 | void *kaddr; | |
a703018f | 399 | int sudirty; |
6c98cd4e | 400 | |
a703018f RK |
401 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
402 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); | |
403 | if (nilfs_segment_usage_clean(su)) { | |
404 | printk(KERN_WARNING "%s: segment %llu is already clean\n", | |
405 | __func__, (unsigned long long)segnum); | |
6c98cd4e | 406 | kunmap_atomic(kaddr, KM_USER0); |
a703018f | 407 | return; |
6c98cd4e | 408 | } |
a703018f RK |
409 | WARN_ON(nilfs_segment_usage_error(su)); |
410 | WARN_ON(!nilfs_segment_usage_dirty(su)); | |
6c98cd4e | 411 | |
a703018f RK |
412 | sudirty = nilfs_segment_usage_dirty(su); |
413 | nilfs_segment_usage_set_clean(su); | |
414 | kunmap_atomic(kaddr, KM_USER0); | |
415 | nilfs_mdt_mark_buffer_dirty(su_bh); | |
6c98cd4e | 416 | |
a703018f | 417 | nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0); |
aa474a22 RK |
418 | NILFS_SUI(sufile)->ncleansegs++; |
419 | ||
a703018f | 420 | nilfs_mdt_mark_dirty(sufile); |
6c98cd4e KS |
421 | } |
422 | ||
423 | /** | |
424 | * nilfs_sufile_get_segment_usage - get a segment usage | |
425 | * @sufile: inode of segment usage file | |
426 | * @segnum: segment number | |
427 | * @sup: pointer to segment usage | |
428 | * @bhp: pointer to buffer head | |
429 | * | |
430 | * Description: nilfs_sufile_get_segment_usage() acquires the segment usage | |
431 | * specified by @segnum. | |
432 | * | |
433 | * Return Value: On success, 0 is returned, and the segment usage and the | |
434 | * buffer head of the buffer on which the segment usage is located are stored | |
435 | * in the place pointed by @sup and @bhp, respectively. On error, one of the | |
436 | * following negative error codes is returned. | |
437 | * | |
438 | * %-EIO - I/O error. | |
439 | * | |
440 | * %-ENOMEM - Insufficient amount of memory available. | |
441 | * | |
442 | * %-EINVAL - Invalid segment usage number. | |
443 | */ | |
444 | int nilfs_sufile_get_segment_usage(struct inode *sufile, __u64 segnum, | |
445 | struct nilfs_segment_usage **sup, | |
446 | struct buffer_head **bhp) | |
447 | { | |
448 | struct buffer_head *bh; | |
449 | struct nilfs_segment_usage *su; | |
450 | void *kaddr; | |
451 | int ret; | |
452 | ||
453 | /* segnum is 0 origin */ | |
1f5abe7e RK |
454 | if (segnum >= nilfs_sufile_get_nsegments(sufile)) |
455 | return -EINVAL; | |
6c98cd4e KS |
456 | down_write(&NILFS_MDT(sufile)->mi_sem); |
457 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &bh); | |
458 | if (ret < 0) | |
459 | goto out_sem; | |
460 | kaddr = kmap(bh->b_page); | |
461 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr); | |
462 | if (nilfs_segment_usage_error(su)) { | |
463 | kunmap(bh->b_page); | |
464 | brelse(bh); | |
465 | ret = -EINVAL; | |
466 | goto out_sem; | |
467 | } | |
468 | ||
469 | if (sup != NULL) | |
470 | *sup = su; | |
471 | *bhp = bh; | |
472 | ||
473 | out_sem: | |
474 | up_write(&NILFS_MDT(sufile)->mi_sem); | |
475 | return ret; | |
476 | } | |
477 | ||
478 | /** | |
479 | * nilfs_sufile_put_segment_usage - put a segment usage | |
480 | * @sufile: inode of segment usage file | |
481 | * @segnum: segment number | |
482 | * @bh: buffer head | |
483 | * | |
484 | * Description: nilfs_sufile_put_segment_usage() releases the segment usage | |
485 | * specified by @segnum. @bh must be the buffer head which have been returned | |
486 | * by a previous call to nilfs_sufile_get_segment_usage() with @segnum. | |
487 | */ | |
488 | void nilfs_sufile_put_segment_usage(struct inode *sufile, __u64 segnum, | |
489 | struct buffer_head *bh) | |
490 | { | |
491 | kunmap(bh->b_page); | |
492 | brelse(bh); | |
493 | } | |
494 | ||
495 | /** | |
496 | * nilfs_sufile_get_stat - get segment usage statistics | |
497 | * @sufile: inode of segment usage file | |
498 | * @stat: pointer to a structure of segment usage statistics | |
499 | * | |
500 | * Description: nilfs_sufile_get_stat() returns information about segment | |
501 | * usage. | |
502 | * | |
503 | * Return Value: On success, 0 is returned, and segment usage information is | |
504 | * stored in the place pointed by @stat. On error, one of the following | |
505 | * negative error codes is returned. | |
506 | * | |
507 | * %-EIO - I/O error. | |
508 | * | |
509 | * %-ENOMEM - Insufficient amount of memory available. | |
510 | */ | |
511 | int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat) | |
512 | { | |
513 | struct buffer_head *header_bh; | |
514 | struct nilfs_sufile_header *header; | |
2c2e52fc | 515 | struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs; |
6c98cd4e KS |
516 | void *kaddr; |
517 | int ret; | |
518 | ||
519 | down_read(&NILFS_MDT(sufile)->mi_sem); | |
520 | ||
521 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
522 | if (ret < 0) | |
523 | goto out_sem; | |
524 | ||
525 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
7b16c8a2 | 526 | header = kaddr + bh_offset(header_bh); |
6c98cd4e KS |
527 | sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile); |
528 | sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs); | |
529 | sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs); | |
2c2e52fc RK |
530 | sustat->ss_ctime = nilfs->ns_ctime; |
531 | sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime; | |
532 | spin_lock(&nilfs->ns_last_segment_lock); | |
533 | sustat->ss_prot_seq = nilfs->ns_prot_seq; | |
534 | spin_unlock(&nilfs->ns_last_segment_lock); | |
6c98cd4e KS |
535 | kunmap_atomic(kaddr, KM_USER0); |
536 | brelse(header_bh); | |
537 | ||
538 | out_sem: | |
539 | up_read(&NILFS_MDT(sufile)->mi_sem); | |
540 | return ret; | |
541 | } | |
542 | ||
543 | /** | |
544 | * nilfs_sufile_get_ncleansegs - get the number of clean segments | |
545 | * @sufile: inode of segment usage file | |
546 | * @nsegsp: pointer to the number of clean segments | |
547 | * | |
548 | * Description: nilfs_sufile_get_ncleansegs() acquires the number of clean | |
549 | * segments. | |
550 | * | |
551 | * Return Value: On success, 0 is returned and the number of clean segments is | |
552 | * stored in the place pointed by @nsegsp. On error, one of the following | |
553 | * negative error codes is returned. | |
554 | * | |
555 | * %-EIO - I/O error. | |
556 | * | |
557 | * %-ENOMEM - Insufficient amount of memory available. | |
558 | */ | |
559 | int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp) | |
560 | { | |
aa474a22 RK |
561 | *nsegsp = NILFS_SUI(sufile)->ncleansegs; |
562 | return 0; | |
6c98cd4e KS |
563 | } |
564 | ||
a703018f RK |
565 | void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum, |
566 | struct buffer_head *header_bh, | |
567 | struct buffer_head *su_bh) | |
6c98cd4e | 568 | { |
6c98cd4e | 569 | struct nilfs_segment_usage *su; |
6c98cd4e | 570 | void *kaddr; |
a703018f | 571 | int suclean; |
6c98cd4e KS |
572 | |
573 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
574 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); | |
575 | if (nilfs_segment_usage_error(su)) { | |
576 | kunmap_atomic(kaddr, KM_USER0); | |
a703018f | 577 | return; |
6c98cd4e | 578 | } |
88072faf | 579 | suclean = nilfs_segment_usage_clean(su); |
6c98cd4e KS |
580 | nilfs_segment_usage_set_error(su); |
581 | kunmap_atomic(kaddr, KM_USER0); | |
6c98cd4e | 582 | |
aa474a22 | 583 | if (suclean) { |
a703018f | 584 | nilfs_sufile_mod_counter(header_bh, -1, 0); |
aa474a22 RK |
585 | NILFS_SUI(sufile)->ncleansegs--; |
586 | } | |
6c98cd4e KS |
587 | nilfs_mdt_mark_buffer_dirty(su_bh); |
588 | nilfs_mdt_mark_dirty(sufile); | |
6c98cd4e KS |
589 | } |
590 | ||
591 | /** | |
592 | * nilfs_sufile_get_suinfo - | |
593 | * @sufile: inode of segment usage file | |
594 | * @segnum: segment number to start looking | |
003ff182 RK |
595 | * @buf: array of suinfo |
596 | * @sisz: byte size of suinfo | |
6c98cd4e KS |
597 | * @nsi: size of suinfo array |
598 | * | |
599 | * Description: | |
600 | * | |
601 | * Return Value: On success, 0 is returned and .... On error, one of the | |
602 | * following negative error codes is returned. | |
603 | * | |
604 | * %-EIO - I/O error. | |
605 | * | |
606 | * %-ENOMEM - Insufficient amount of memory available. | |
607 | */ | |
003ff182 RK |
608 | ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf, |
609 | unsigned sisz, size_t nsi) | |
6c98cd4e KS |
610 | { |
611 | struct buffer_head *su_bh; | |
612 | struct nilfs_segment_usage *su; | |
003ff182 | 613 | struct nilfs_suinfo *si = buf; |
6c98cd4e | 614 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; |
cece5520 | 615 | struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs; |
6c98cd4e KS |
616 | void *kaddr; |
617 | unsigned long nsegs, segusages_per_block; | |
618 | ssize_t n; | |
619 | int ret, i, j; | |
620 | ||
621 | down_read(&NILFS_MDT(sufile)->mi_sem); | |
622 | ||
623 | segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile); | |
624 | nsegs = min_t(unsigned long, | |
625 | nilfs_sufile_get_nsegments(sufile) - segnum, | |
626 | nsi); | |
627 | for (i = 0; i < nsegs; i += n, segnum += n) { | |
628 | n = min_t(unsigned long, | |
629 | segusages_per_block - | |
630 | nilfs_sufile_get_offset(sufile, segnum), | |
631 | nsegs - i); | |
632 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, | |
633 | &su_bh); | |
634 | if (ret < 0) { | |
635 | if (ret != -ENOENT) | |
636 | goto out; | |
637 | /* hole */ | |
003ff182 RK |
638 | memset(si, 0, sisz * n); |
639 | si = (void *)si + sisz * n; | |
6c98cd4e KS |
640 | continue; |
641 | } | |
642 | ||
643 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); | |
644 | su = nilfs_sufile_block_get_segment_usage( | |
645 | sufile, segnum, su_bh, kaddr); | |
003ff182 RK |
646 | for (j = 0; j < n; |
647 | j++, su = (void *)su + susz, si = (void *)si + sisz) { | |
648 | si->sui_lastmod = le64_to_cpu(su->su_lastmod); | |
649 | si->sui_nblocks = le32_to_cpu(su->su_nblocks); | |
650 | si->sui_flags = le32_to_cpu(su->su_flags) & | |
cece5520 | 651 | ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE); |
3efb55b4 | 652 | if (nilfs_segment_is_active(nilfs, segnum + j)) |
003ff182 | 653 | si->sui_flags |= |
cece5520 | 654 | (1UL << NILFS_SEGMENT_USAGE_ACTIVE); |
6c98cd4e KS |
655 | } |
656 | kunmap_atomic(kaddr, KM_USER0); | |
657 | brelse(su_bh); | |
658 | } | |
659 | ret = nsegs; | |
660 | ||
661 | out: | |
662 | up_read(&NILFS_MDT(sufile)->mi_sem); | |
663 | return ret; | |
664 | } | |
79739565 | 665 | |
8707df38 RK |
666 | /** |
667 | * nilfs_sufile_read - read sufile inode | |
668 | * @sufile: sufile inode | |
669 | * @raw_inode: on-disk sufile inode | |
670 | */ | |
671 | int nilfs_sufile_read(struct inode *sufile, struct nilfs_inode *raw_inode) | |
672 | { | |
aa474a22 RK |
673 | struct nilfs_sufile_info *sui = NILFS_SUI(sufile); |
674 | struct buffer_head *header_bh; | |
675 | struct nilfs_sufile_header *header; | |
676 | void *kaddr; | |
677 | int ret; | |
678 | ||
679 | ret = nilfs_read_inode_common(sufile, raw_inode); | |
680 | if (ret < 0) | |
681 | return ret; | |
682 | ||
683 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | |
684 | if (!ret) { | |
685 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); | |
686 | header = kaddr + bh_offset(header_bh); | |
687 | sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs); | |
688 | kunmap_atomic(kaddr, KM_USER0); | |
689 | brelse(header_bh); | |
690 | } | |
691 | return ret; | |
8707df38 RK |
692 | } |
693 | ||
79739565 RK |
694 | /** |
695 | * nilfs_sufile_new - create sufile | |
696 | * @nilfs: nilfs object | |
697 | * @susize: size of a segment usage entry | |
698 | */ | |
699 | struct inode *nilfs_sufile_new(struct the_nilfs *nilfs, size_t susize) | |
700 | { | |
701 | struct inode *sufile; | |
702 | ||
aa474a22 RK |
703 | sufile = nilfs_mdt_new(nilfs, NULL, NILFS_SUFILE_INO, |
704 | sizeof(struct nilfs_sufile_info)); | |
79739565 RK |
705 | if (sufile) |
706 | nilfs_mdt_set_entry_size(sufile, susize, | |
707 | sizeof(struct nilfs_sufile_header)); | |
708 | return sufile; | |
709 | } |