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Koji Sato6c98cd42009-04-06 19:01:32 -07001/*
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>.
Ryusuke Konishi7a650042010-03-14 03:32:40 +090021 * Revised by Ryusuke Konishi <ryusuke@osrg.net>.
Koji Sato6c98cd42009-04-06 19:01:32 -070022 */
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
Ryusuke Konishiaa474a22009-11-13 03:41:55 +090034struct nilfs_sufile_info {
35 struct nilfs_mdt_info mi;
36 unsigned long ncleansegs;
37};
38
39static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile)
40{
41 return (struct nilfs_sufile_info *)NILFS_MDT(sufile);
42}
43
Koji Sato6c98cd42009-04-06 19:01:32 -070044static inline unsigned long
45nilfs_sufile_segment_usages_per_block(const struct inode *sufile)
46{
47 return NILFS_MDT(sufile)->mi_entries_per_block;
48}
49
50static unsigned long
51nilfs_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
58static unsigned long
59nilfs_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
65static unsigned long
66nilfs_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
Koji Sato6c98cd42009-04-06 19:01:32 -070075static struct nilfs_segment_usage *
76nilfs_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
84static 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
90static inline int
91nilfs_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
Ryusuke Konishia7030182009-04-05 18:24:11 +090099static 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
Ryusuke Konishidda54f42009-05-16 21:49:10 +0900114/**
Ryusuke Konishief7d4752009-11-13 08:45:32 +0900115 * nilfs_sufile_get_ncleansegs - return the number of clean segments
116 * @sufile: inode of segment usage file
117 */
118unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile)
119{
120 return NILFS_SUI(sufile)->ncleansegs;
121}
122
123/**
Ryusuke Konishidda54f42009-05-16 21:49:10 +0900124 * nilfs_sufile_updatev - modify multiple segment usages at a time
125 * @sufile: inode of segment usage file
126 * @segnumv: array of segment numbers
127 * @nsegs: size of @segnumv array
128 * @create: creation flag
129 * @ndone: place to store number of modified segments on @segnumv
130 * @dofunc: primitive operation for the update
131 *
132 * Description: nilfs_sufile_updatev() repeatedly calls @dofunc
133 * against the given array of segments. The @dofunc is called with
134 * buffers of a header block and the sufile block in which the target
135 * segment usage entry is contained. If @ndone is given, the number
136 * of successfully modified segments from the head is stored in the
137 * place @ndone points to.
138 *
139 * Return Value: On success, zero is returned. On error, one of the
140 * following negative error codes is returned.
141 *
142 * %-EIO - I/O error.
143 *
144 * %-ENOMEM - Insufficient amount of memory available.
145 *
146 * %-ENOENT - Given segment usage is in hole block (may be returned if
147 * @create is zero)
148 *
149 * %-EINVAL - Invalid segment usage number
150 */
151int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs,
152 int create, size_t *ndone,
153 void (*dofunc)(struct inode *, __u64,
154 struct buffer_head *,
155 struct buffer_head *))
156{
157 struct buffer_head *header_bh, *bh;
158 unsigned long blkoff, prev_blkoff;
159 __u64 *seg;
160 size_t nerr = 0, n = 0;
161 int ret = 0;
162
163 if (unlikely(nsegs == 0))
164 goto out;
165
166 down_write(&NILFS_MDT(sufile)->mi_sem);
167 for (seg = segnumv; seg < segnumv + nsegs; seg++) {
168 if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) {
169 printk(KERN_WARNING
170 "%s: invalid segment number: %llu\n", __func__,
171 (unsigned long long)*seg);
172 nerr++;
173 }
174 }
175 if (nerr > 0) {
176 ret = -EINVAL;
177 goto out_sem;
178 }
179
180 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
181 if (ret < 0)
182 goto out_sem;
183
184 seg = segnumv;
185 blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
186 ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
187 if (ret < 0)
188 goto out_header;
189
190 for (;;) {
191 dofunc(sufile, *seg, header_bh, bh);
192
193 if (++seg >= segnumv + nsegs)
194 break;
195 prev_blkoff = blkoff;
196 blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
197 if (blkoff == prev_blkoff)
198 continue;
199
200 /* get different block */
201 brelse(bh);
202 ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
203 if (unlikely(ret < 0))
204 goto out_header;
205 }
206 brelse(bh);
207
208 out_header:
209 n = seg - segnumv;
210 brelse(header_bh);
211 out_sem:
212 up_write(&NILFS_MDT(sufile)->mi_sem);
213 out:
214 if (ndone)
215 *ndone = n;
216 return ret;
217}
218
Ryusuke Konishia7030182009-04-05 18:24:11 +0900219int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create,
220 void (*dofunc)(struct inode *, __u64,
221 struct buffer_head *,
222 struct buffer_head *))
223{
224 struct buffer_head *header_bh, *bh;
225 int ret;
226
227 if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
228 printk(KERN_WARNING "%s: invalid segment number: %llu\n",
229 __func__, (unsigned long long)segnum);
230 return -EINVAL;
231 }
232 down_write(&NILFS_MDT(sufile)->mi_sem);
233
234 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
235 if (ret < 0)
236 goto out_sem;
237
238 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh);
239 if (!ret) {
240 dofunc(sufile, segnum, header_bh, bh);
241 brelse(bh);
242 }
243 brelse(header_bh);
244
245 out_sem:
246 up_write(&NILFS_MDT(sufile)->mi_sem);
247 return ret;
248}
249
Koji Sato6c98cd42009-04-06 19:01:32 -0700250/**
251 * nilfs_sufile_alloc - allocate a segment
252 * @sufile: inode of segment usage file
253 * @segnump: pointer to segment number
254 *
255 * Description: nilfs_sufile_alloc() allocates a clean segment.
256 *
257 * Return Value: On success, 0 is returned and the segment number of the
258 * allocated segment is stored in the place pointed by @segnump. On error, one
259 * of the following negative error codes is returned.
260 *
261 * %-EIO - I/O error.
262 *
263 * %-ENOMEM - Insufficient amount of memory available.
264 *
265 * %-ENOSPC - No clean segment left.
266 */
267int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
268{
269 struct buffer_head *header_bh, *su_bh;
Koji Sato6c98cd42009-04-06 19:01:32 -0700270 struct nilfs_sufile_header *header;
271 struct nilfs_segment_usage *su;
272 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
273 __u64 segnum, maxsegnum, last_alloc;
274 void *kaddr;
275 unsigned long nsegments, ncleansegs, nsus;
276 int ret, i, j;
277
278 down_write(&NILFS_MDT(sufile)->mi_sem);
279
Koji Sato6c98cd42009-04-06 19:01:32 -0700280 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
281 if (ret < 0)
282 goto out_sem;
283 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
Ryusuke Konishi7b16c8a2009-11-13 03:10:21 +0900284 header = kaddr + bh_offset(header_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700285 ncleansegs = le64_to_cpu(header->sh_ncleansegs);
286 last_alloc = le64_to_cpu(header->sh_last_alloc);
287 kunmap_atomic(kaddr, KM_USER0);
288
289 nsegments = nilfs_sufile_get_nsegments(sufile);
290 segnum = last_alloc + 1;
291 maxsegnum = nsegments - 1;
292 for (i = 0; i < nsegments; i += nsus) {
293 if (segnum >= nsegments) {
294 /* wrap around */
295 segnum = 0;
296 maxsegnum = last_alloc;
297 }
298 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1,
299 &su_bh);
300 if (ret < 0)
301 goto out_header;
302 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
303 su = nilfs_sufile_block_get_segment_usage(
304 sufile, segnum, su_bh, kaddr);
305
306 nsus = nilfs_sufile_segment_usages_in_block(
307 sufile, segnum, maxsegnum);
308 for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) {
309 if (!nilfs_segment_usage_clean(su))
310 continue;
311 /* found a clean segment */
Koji Sato6c98cd42009-04-06 19:01:32 -0700312 nilfs_segment_usage_set_dirty(su);
313 kunmap_atomic(kaddr, KM_USER0);
314
315 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
Ryusuke Konishi7b16c8a2009-11-13 03:10:21 +0900316 header = kaddr + bh_offset(header_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700317 le64_add_cpu(&header->sh_ncleansegs, -1);
318 le64_add_cpu(&header->sh_ndirtysegs, 1);
319 header->sh_last_alloc = cpu_to_le64(segnum);
320 kunmap_atomic(kaddr, KM_USER0);
321
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900322 NILFS_SUI(sufile)->ncleansegs--;
Koji Sato6c98cd42009-04-06 19:01:32 -0700323 nilfs_mdt_mark_buffer_dirty(header_bh);
324 nilfs_mdt_mark_buffer_dirty(su_bh);
325 nilfs_mdt_mark_dirty(sufile);
326 brelse(su_bh);
327 *segnump = segnum;
328 goto out_header;
329 }
330
331 kunmap_atomic(kaddr, KM_USER0);
332 brelse(su_bh);
333 }
334
335 /* no segments left */
336 ret = -ENOSPC;
337
338 out_header:
339 brelse(header_bh);
340
341 out_sem:
342 up_write(&NILFS_MDT(sufile)->mi_sem);
343 return ret;
344}
345
Ryusuke Konishia7030182009-04-05 18:24:11 +0900346void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
347 struct buffer_head *header_bh,
348 struct buffer_head *su_bh)
Koji Sato6c98cd42009-04-06 19:01:32 -0700349{
Koji Sato6c98cd42009-04-06 19:01:32 -0700350 struct nilfs_segment_usage *su;
351 void *kaddr;
Koji Sato6c98cd42009-04-06 19:01:32 -0700352
353 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900354 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700355 if (unlikely(!nilfs_segment_usage_clean(su))) {
356 printk(KERN_WARNING "%s: segment %llu must be clean\n",
Koji Sato6c98cd42009-04-06 19:01:32 -0700357 __func__, (unsigned long long)segnum);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700358 kunmap_atomic(kaddr, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900359 return;
Koji Sato6c98cd42009-04-06 19:01:32 -0700360 }
361 nilfs_segment_usage_set_dirty(su);
362 kunmap_atomic(kaddr, KM_USER0);
363
Ryusuke Konishia7030182009-04-05 18:24:11 +0900364 nilfs_sufile_mod_counter(header_bh, -1, 1);
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900365 NILFS_SUI(sufile)->ncleansegs--;
366
Koji Sato6c98cd42009-04-06 19:01:32 -0700367 nilfs_mdt_mark_buffer_dirty(su_bh);
368 nilfs_mdt_mark_dirty(sufile);
Koji Sato6c98cd42009-04-06 19:01:32 -0700369}
370
Ryusuke Konishic85399c2009-04-05 18:30:58 +0900371void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
372 struct buffer_head *header_bh,
373 struct buffer_head *su_bh)
374{
375 struct nilfs_segment_usage *su;
376 void *kaddr;
377 int clean, dirty;
378
379 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
380 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
381 if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) &&
382 su->su_nblocks == cpu_to_le32(0)) {
383 kunmap_atomic(kaddr, KM_USER0);
384 return;
385 }
386 clean = nilfs_segment_usage_clean(su);
387 dirty = nilfs_segment_usage_dirty(su);
388
389 /* make the segment garbage */
390 su->su_lastmod = cpu_to_le64(0);
391 su->su_nblocks = cpu_to_le32(0);
392 su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY);
393 kunmap_atomic(kaddr, KM_USER0);
394
395 nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900396 NILFS_SUI(sufile)->ncleansegs -= clean;
397
Ryusuke Konishic85399c2009-04-05 18:30:58 +0900398 nilfs_mdt_mark_buffer_dirty(su_bh);
399 nilfs_mdt_mark_dirty(sufile);
400}
401
Ryusuke Konishia7030182009-04-05 18:24:11 +0900402void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
403 struct buffer_head *header_bh,
404 struct buffer_head *su_bh)
Koji Sato6c98cd42009-04-06 19:01:32 -0700405{
Koji Sato6c98cd42009-04-06 19:01:32 -0700406 struct nilfs_segment_usage *su;
407 void *kaddr;
Ryusuke Konishia7030182009-04-05 18:24:11 +0900408 int sudirty;
Koji Sato6c98cd42009-04-06 19:01:32 -0700409
Ryusuke Konishia7030182009-04-05 18:24:11 +0900410 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
411 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
412 if (nilfs_segment_usage_clean(su)) {
413 printk(KERN_WARNING "%s: segment %llu is already clean\n",
414 __func__, (unsigned long long)segnum);
Koji Sato6c98cd42009-04-06 19:01:32 -0700415 kunmap_atomic(kaddr, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900416 return;
Koji Sato6c98cd42009-04-06 19:01:32 -0700417 }
Ryusuke Konishia7030182009-04-05 18:24:11 +0900418 WARN_ON(nilfs_segment_usage_error(su));
419 WARN_ON(!nilfs_segment_usage_dirty(su));
420
421 sudirty = nilfs_segment_usage_dirty(su);
422 nilfs_segment_usage_set_clean(su);
Koji Sato6c98cd42009-04-06 19:01:32 -0700423 kunmap_atomic(kaddr, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900424 nilfs_mdt_mark_buffer_dirty(su_bh);
425
426 nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900427 NILFS_SUI(sufile)->ncleansegs++;
428
Koji Sato6c98cd42009-04-06 19:01:32 -0700429 nilfs_mdt_mark_dirty(sufile);
Koji Sato6c98cd42009-04-06 19:01:32 -0700430}
431
432/**
Ryusuke Konishi61a189e2009-11-18 17:25:12 +0900433 * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
434 * @sufile: inode of segment usage file
435 * @segnum: segment number
436 */
437int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
438{
439 struct buffer_head *bh;
440 int ret;
441
442 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
443 if (!ret) {
444 nilfs_mdt_mark_buffer_dirty(bh);
445 nilfs_mdt_mark_dirty(sufile);
446 brelse(bh);
447 }
448 return ret;
449}
450
451/**
Ryusuke Konishi071ec542009-11-18 18:23:34 +0900452 * nilfs_sufile_set_segment_usage - set usage of a segment
453 * @sufile: inode of segment usage file
454 * @segnum: segment number
455 * @nblocks: number of live blocks in the segment
456 * @modtime: modification time (option)
457 */
458int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
459 unsigned long nblocks, time_t modtime)
460{
461 struct buffer_head *bh;
462 struct nilfs_segment_usage *su;
463 void *kaddr;
464 int ret;
465
466 down_write(&NILFS_MDT(sufile)->mi_sem);
467 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
468 if (ret < 0)
469 goto out_sem;
470
471 kaddr = kmap_atomic(bh->b_page, KM_USER0);
472 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
473 WARN_ON(nilfs_segment_usage_error(su));
474 if (modtime)
475 su->su_lastmod = cpu_to_le64(modtime);
476 su->su_nblocks = cpu_to_le32(nblocks);
477 kunmap_atomic(kaddr, KM_USER0);
478
479 nilfs_mdt_mark_buffer_dirty(bh);
480 nilfs_mdt_mark_dirty(sufile);
481 brelse(bh);
482
483 out_sem:
484 up_write(&NILFS_MDT(sufile)->mi_sem);
485 return ret;
486}
487
488/**
Koji Sato6c98cd42009-04-06 19:01:32 -0700489 * nilfs_sufile_get_stat - get segment usage statistics
490 * @sufile: inode of segment usage file
491 * @stat: pointer to a structure of segment usage statistics
492 *
493 * Description: nilfs_sufile_get_stat() returns information about segment
494 * usage.
495 *
496 * Return Value: On success, 0 is returned, and segment usage information is
497 * stored in the place pointed by @stat. On error, one of the following
498 * negative error codes is returned.
499 *
500 * %-EIO - I/O error.
501 *
502 * %-ENOMEM - Insufficient amount of memory available.
503 */
504int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
505{
506 struct buffer_head *header_bh;
507 struct nilfs_sufile_header *header;
Ryusuke Konishi2c2e52f2009-04-06 19:01:54 -0700508 struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
Koji Sato6c98cd42009-04-06 19:01:32 -0700509 void *kaddr;
510 int ret;
511
512 down_read(&NILFS_MDT(sufile)->mi_sem);
513
514 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
515 if (ret < 0)
516 goto out_sem;
517
518 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
Ryusuke Konishi7b16c8a2009-11-13 03:10:21 +0900519 header = kaddr + bh_offset(header_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700520 sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
521 sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
522 sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
Ryusuke Konishi2c2e52f2009-04-06 19:01:54 -0700523 sustat->ss_ctime = nilfs->ns_ctime;
524 sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime;
525 spin_lock(&nilfs->ns_last_segment_lock);
526 sustat->ss_prot_seq = nilfs->ns_prot_seq;
527 spin_unlock(&nilfs->ns_last_segment_lock);
Koji Sato6c98cd42009-04-06 19:01:32 -0700528 kunmap_atomic(kaddr, KM_USER0);
529 brelse(header_bh);
530
531 out_sem:
532 up_read(&NILFS_MDT(sufile)->mi_sem);
533 return ret;
534}
535
Ryusuke Konishia7030182009-04-05 18:24:11 +0900536void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
537 struct buffer_head *header_bh,
538 struct buffer_head *su_bh)
Koji Sato6c98cd42009-04-06 19:01:32 -0700539{
Koji Sato6c98cd42009-04-06 19:01:32 -0700540 struct nilfs_segment_usage *su;
Koji Sato6c98cd42009-04-06 19:01:32 -0700541 void *kaddr;
Ryusuke Konishia7030182009-04-05 18:24:11 +0900542 int suclean;
Koji Sato6c98cd42009-04-06 19:01:32 -0700543
544 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
545 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
546 if (nilfs_segment_usage_error(su)) {
547 kunmap_atomic(kaddr, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900548 return;
Koji Sato6c98cd42009-04-06 19:01:32 -0700549 }
Ryusuke Konishi88072fa2009-04-05 15:03:16 +0900550 suclean = nilfs_segment_usage_clean(su);
Koji Sato6c98cd42009-04-06 19:01:32 -0700551 nilfs_segment_usage_set_error(su);
552 kunmap_atomic(kaddr, KM_USER0);
Koji Sato6c98cd42009-04-06 19:01:32 -0700553
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900554 if (suclean) {
Ryusuke Konishia7030182009-04-05 18:24:11 +0900555 nilfs_sufile_mod_counter(header_bh, -1, 0);
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900556 NILFS_SUI(sufile)->ncleansegs--;
557 }
Koji Sato6c98cd42009-04-06 19:01:32 -0700558 nilfs_mdt_mark_buffer_dirty(su_bh);
559 nilfs_mdt_mark_dirty(sufile);
Koji Sato6c98cd42009-04-06 19:01:32 -0700560}
561
562/**
563 * nilfs_sufile_get_suinfo -
564 * @sufile: inode of segment usage file
565 * @segnum: segment number to start looking
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900566 * @buf: array of suinfo
567 * @sisz: byte size of suinfo
Koji Sato6c98cd42009-04-06 19:01:32 -0700568 * @nsi: size of suinfo array
569 *
570 * Description:
571 *
572 * Return Value: On success, 0 is returned and .... On error, one of the
573 * following negative error codes is returned.
574 *
575 * %-EIO - I/O error.
576 *
577 * %-ENOMEM - Insufficient amount of memory available.
578 */
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900579ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
580 unsigned sisz, size_t nsi)
Koji Sato6c98cd42009-04-06 19:01:32 -0700581{
582 struct buffer_head *su_bh;
583 struct nilfs_segment_usage *su;
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900584 struct nilfs_suinfo *si = buf;
Koji Sato6c98cd42009-04-06 19:01:32 -0700585 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
Ryusuke Konishicece5522009-04-06 19:01:58 -0700586 struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
Koji Sato6c98cd42009-04-06 19:01:32 -0700587 void *kaddr;
588 unsigned long nsegs, segusages_per_block;
589 ssize_t n;
590 int ret, i, j;
591
592 down_read(&NILFS_MDT(sufile)->mi_sem);
593
594 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
595 nsegs = min_t(unsigned long,
596 nilfs_sufile_get_nsegments(sufile) - segnum,
597 nsi);
598 for (i = 0; i < nsegs; i += n, segnum += n) {
599 n = min_t(unsigned long,
600 segusages_per_block -
601 nilfs_sufile_get_offset(sufile, segnum),
602 nsegs - i);
603 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
604 &su_bh);
605 if (ret < 0) {
606 if (ret != -ENOENT)
607 goto out;
608 /* hole */
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900609 memset(si, 0, sisz * n);
610 si = (void *)si + sisz * n;
Koji Sato6c98cd42009-04-06 19:01:32 -0700611 continue;
612 }
613
614 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
615 su = nilfs_sufile_block_get_segment_usage(
616 sufile, segnum, su_bh, kaddr);
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900617 for (j = 0; j < n;
618 j++, su = (void *)su + susz, si = (void *)si + sisz) {
619 si->sui_lastmod = le64_to_cpu(su->su_lastmod);
620 si->sui_nblocks = le32_to_cpu(su->su_nblocks);
621 si->sui_flags = le32_to_cpu(su->su_flags) &
Ryusuke Konishicece5522009-04-06 19:01:58 -0700622 ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
Ryusuke Konishi3efb55b2009-03-30 00:50:19 +0900623 if (nilfs_segment_is_active(nilfs, segnum + j))
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900624 si->sui_flags |=
Ryusuke Konishicece5522009-04-06 19:01:58 -0700625 (1UL << NILFS_SEGMENT_USAGE_ACTIVE);
Koji Sato6c98cd42009-04-06 19:01:32 -0700626 }
627 kunmap_atomic(kaddr, KM_USER0);
628 brelse(su_bh);
629 }
630 ret = nsegs;
631
632 out:
633 up_read(&NILFS_MDT(sufile)->mi_sem);
634 return ret;
635}
Ryusuke Konishi79739562009-11-12 23:56:43 +0900636
637/**
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900638 * nilfs_sufile_read - read or get sufile inode
639 * @sb: super block instance
640 * @susize: size of a segment usage entry
Ryusuke Konishi8707df32009-11-13 01:36:56 +0900641 * @raw_inode: on-disk sufile inode
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900642 * @inodep: buffer to store the inode
Ryusuke Konishi8707df32009-11-13 01:36:56 +0900643 */
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900644int nilfs_sufile_read(struct super_block *sb, size_t susize,
645 struct nilfs_inode *raw_inode, struct inode **inodep)
Ryusuke Konishi8707df32009-11-13 01:36:56 +0900646{
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900647 struct inode *sufile;
648 struct nilfs_sufile_info *sui;
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900649 struct buffer_head *header_bh;
650 struct nilfs_sufile_header *header;
651 void *kaddr;
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900652 int err;
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900653
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900654 sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
655 if (unlikely(!sufile))
656 return -ENOMEM;
657 if (!(sufile->i_state & I_NEW))
658 goto out;
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900659
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900660 err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui));
661 if (err)
662 goto failed;
Ryusuke Konishi8707df32009-11-13 01:36:56 +0900663
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900664 nilfs_mdt_set_entry_size(sufile, susize,
665 sizeof(struct nilfs_sufile_header));
Ryusuke Konishi79739562009-11-12 23:56:43 +0900666
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900667 err = nilfs_read_inode_common(sufile, raw_inode);
668 if (err)
669 goto failed;
670
671 err = nilfs_sufile_get_header_block(sufile, &header_bh);
672 if (err)
673 goto failed;
674
675 sui = NILFS_SUI(sufile);
676 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
677 header = kaddr + bh_offset(header_bh);
678 sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
679 kunmap_atomic(kaddr, KM_USER0);
680 brelse(header_bh);
681
682 unlock_new_inode(sufile);
683 out:
684 *inodep = sufile;
685 return 0;
686 failed:
687 iget_failed(sufile);
688 return err;
Ryusuke Konishi79739562009-11-12 23:56:43 +0900689}