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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;
Ryusuke Konishi619205d2011-05-05 01:23:57 +090036 unsigned long ncleansegs;/* number of clean segments */
37 __u64 allocmin; /* lower limit of allocatable segment range */
38 __u64 allocmax; /* upper limit of allocatable segment range */
Ryusuke Konishiaa474a22009-11-13 03:41:55 +090039};
40
41static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile)
42{
43 return (struct nilfs_sufile_info *)NILFS_MDT(sufile);
44}
45
Koji Sato6c98cd42009-04-06 19:01:32 -070046static inline unsigned long
47nilfs_sufile_segment_usages_per_block(const struct inode *sufile)
48{
49 return NILFS_MDT(sufile)->mi_entries_per_block;
50}
51
52static unsigned long
53nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum)
54{
55 __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
56 do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
57 return (unsigned long)t;
58}
59
60static unsigned long
61nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum)
62{
63 __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
64 return do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
65}
66
67static unsigned long
68nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr,
69 __u64 max)
70{
71 return min_t(unsigned long,
72 nilfs_sufile_segment_usages_per_block(sufile) -
73 nilfs_sufile_get_offset(sufile, curr),
74 max - curr + 1);
75}
76
Koji Sato6c98cd42009-04-06 19:01:32 -070077static struct nilfs_segment_usage *
78nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum,
79 struct buffer_head *bh, void *kaddr)
80{
81 return kaddr + bh_offset(bh) +
82 nilfs_sufile_get_offset(sufile, segnum) *
83 NILFS_MDT(sufile)->mi_entry_size;
84}
85
86static inline int nilfs_sufile_get_header_block(struct inode *sufile,
87 struct buffer_head **bhp)
88{
89 return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp);
90}
91
92static inline int
93nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum,
94 int create, struct buffer_head **bhp)
95{
96 return nilfs_mdt_get_block(sufile,
97 nilfs_sufile_get_blkoff(sufile, segnum),
98 create, NULL, bhp);
99}
100
Ryusuke Konishi78eb64c2011-05-05 01:23:58 +0900101static int nilfs_sufile_delete_segment_usage_block(struct inode *sufile,
102 __u64 segnum)
103{
104 return nilfs_mdt_delete_block(sufile,
105 nilfs_sufile_get_blkoff(sufile, segnum));
106}
107
Ryusuke Konishia7030182009-04-05 18:24:11 +0900108static void nilfs_sufile_mod_counter(struct buffer_head *header_bh,
109 u64 ncleanadd, u64 ndirtyadd)
110{
111 struct nilfs_sufile_header *header;
112 void *kaddr;
113
114 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
115 header = kaddr + bh_offset(header_bh);
116 le64_add_cpu(&header->sh_ncleansegs, ncleanadd);
117 le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd);
118 kunmap_atomic(kaddr, KM_USER0);
119
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900120 mark_buffer_dirty(header_bh);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900121}
122
Ryusuke Konishidda54f42009-05-16 21:49:10 +0900123/**
Ryusuke Konishief7d4752009-11-13 08:45:32 +0900124 * nilfs_sufile_get_ncleansegs - return the number of clean segments
125 * @sufile: inode of segment usage file
126 */
127unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile)
128{
129 return NILFS_SUI(sufile)->ncleansegs;
130}
131
132/**
Ryusuke Konishidda54f42009-05-16 21:49:10 +0900133 * nilfs_sufile_updatev - modify multiple segment usages at a time
134 * @sufile: inode of segment usage file
135 * @segnumv: array of segment numbers
136 * @nsegs: size of @segnumv array
137 * @create: creation flag
138 * @ndone: place to store number of modified segments on @segnumv
139 * @dofunc: primitive operation for the update
140 *
141 * Description: nilfs_sufile_updatev() repeatedly calls @dofunc
142 * against the given array of segments. The @dofunc is called with
143 * buffers of a header block and the sufile block in which the target
144 * segment usage entry is contained. If @ndone is given, the number
145 * of successfully modified segments from the head is stored in the
146 * place @ndone points to.
147 *
148 * Return Value: On success, zero is returned. On error, one of the
149 * following negative error codes is returned.
150 *
151 * %-EIO - I/O error.
152 *
153 * %-ENOMEM - Insufficient amount of memory available.
154 *
155 * %-ENOENT - Given segment usage is in hole block (may be returned if
156 * @create is zero)
157 *
158 * %-EINVAL - Invalid segment usage number
159 */
160int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs,
161 int create, size_t *ndone,
162 void (*dofunc)(struct inode *, __u64,
163 struct buffer_head *,
164 struct buffer_head *))
165{
166 struct buffer_head *header_bh, *bh;
167 unsigned long blkoff, prev_blkoff;
168 __u64 *seg;
169 size_t nerr = 0, n = 0;
170 int ret = 0;
171
172 if (unlikely(nsegs == 0))
173 goto out;
174
175 down_write(&NILFS_MDT(sufile)->mi_sem);
176 for (seg = segnumv; seg < segnumv + nsegs; seg++) {
177 if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) {
178 printk(KERN_WARNING
179 "%s: invalid segment number: %llu\n", __func__,
180 (unsigned long long)*seg);
181 nerr++;
182 }
183 }
184 if (nerr > 0) {
185 ret = -EINVAL;
186 goto out_sem;
187 }
188
189 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
190 if (ret < 0)
191 goto out_sem;
192
193 seg = segnumv;
194 blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
195 ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
196 if (ret < 0)
197 goto out_header;
198
199 for (;;) {
200 dofunc(sufile, *seg, header_bh, bh);
201
202 if (++seg >= segnumv + nsegs)
203 break;
204 prev_blkoff = blkoff;
205 blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
206 if (blkoff == prev_blkoff)
207 continue;
208
209 /* get different block */
210 brelse(bh);
211 ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
212 if (unlikely(ret < 0))
213 goto out_header;
214 }
215 brelse(bh);
216
217 out_header:
218 n = seg - segnumv;
219 brelse(header_bh);
220 out_sem:
221 up_write(&NILFS_MDT(sufile)->mi_sem);
222 out:
223 if (ndone)
224 *ndone = n;
225 return ret;
226}
227
Ryusuke Konishia7030182009-04-05 18:24:11 +0900228int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create,
229 void (*dofunc)(struct inode *, __u64,
230 struct buffer_head *,
231 struct buffer_head *))
232{
233 struct buffer_head *header_bh, *bh;
234 int ret;
235
236 if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
237 printk(KERN_WARNING "%s: invalid segment number: %llu\n",
238 __func__, (unsigned long long)segnum);
239 return -EINVAL;
240 }
241 down_write(&NILFS_MDT(sufile)->mi_sem);
242
243 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
244 if (ret < 0)
245 goto out_sem;
246
247 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh);
248 if (!ret) {
249 dofunc(sufile, segnum, header_bh, bh);
250 brelse(bh);
251 }
252 brelse(header_bh);
253
254 out_sem:
255 up_write(&NILFS_MDT(sufile)->mi_sem);
256 return ret;
257}
258
Koji Sato6c98cd42009-04-06 19:01:32 -0700259/**
Ryusuke Konishi619205d2011-05-05 01:23:57 +0900260 * nilfs_sufile_set_alloc_range - limit range of segment to be allocated
261 * @sufile: inode of segment usage file
262 * @start: minimum segment number of allocatable region (inclusive)
263 * @end: maximum segment number of allocatable region (inclusive)
264 *
265 * Return Value: On success, 0 is returned. On error, one of the
266 * following negative error codes is returned.
267 *
268 * %-ERANGE - invalid segment region
269 */
270int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end)
271{
272 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
273 __u64 nsegs;
274 int ret = -ERANGE;
275
276 down_write(&NILFS_MDT(sufile)->mi_sem);
277 nsegs = nilfs_sufile_get_nsegments(sufile);
278
279 if (start <= end && end < nsegs) {
280 sui->allocmin = start;
281 sui->allocmax = end;
282 ret = 0;
283 }
284 up_write(&NILFS_MDT(sufile)->mi_sem);
285 return ret;
286}
287
288/**
Koji Sato6c98cd42009-04-06 19:01:32 -0700289 * nilfs_sufile_alloc - allocate a segment
290 * @sufile: inode of segment usage file
291 * @segnump: pointer to segment number
292 *
293 * Description: nilfs_sufile_alloc() allocates a clean segment.
294 *
295 * Return Value: On success, 0 is returned and the segment number of the
296 * allocated segment is stored in the place pointed by @segnump. On error, one
297 * of the following negative error codes is returned.
298 *
299 * %-EIO - I/O error.
300 *
301 * %-ENOMEM - Insufficient amount of memory available.
302 *
303 * %-ENOSPC - No clean segment left.
304 */
305int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
306{
307 struct buffer_head *header_bh, *su_bh;
Koji Sato6c98cd42009-04-06 19:01:32 -0700308 struct nilfs_sufile_header *header;
309 struct nilfs_segment_usage *su;
Ryusuke Konishi619205d2011-05-05 01:23:57 +0900310 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
Koji Sato6c98cd42009-04-06 19:01:32 -0700311 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
312 __u64 segnum, maxsegnum, last_alloc;
313 void *kaddr;
Ryusuke Konishi619205d2011-05-05 01:23:57 +0900314 unsigned long nsegments, ncleansegs, nsus, cnt;
315 int ret, j;
Koji Sato6c98cd42009-04-06 19:01:32 -0700316
317 down_write(&NILFS_MDT(sufile)->mi_sem);
318
Koji Sato6c98cd42009-04-06 19:01:32 -0700319 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
320 if (ret < 0)
321 goto out_sem;
322 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
Ryusuke Konishi7b16c8a2009-11-13 03:10:21 +0900323 header = kaddr + bh_offset(header_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700324 ncleansegs = le64_to_cpu(header->sh_ncleansegs);
325 last_alloc = le64_to_cpu(header->sh_last_alloc);
326 kunmap_atomic(kaddr, KM_USER0);
327
328 nsegments = nilfs_sufile_get_nsegments(sufile);
Ryusuke Konishi619205d2011-05-05 01:23:57 +0900329 maxsegnum = sui->allocmax;
Koji Sato6c98cd42009-04-06 19:01:32 -0700330 segnum = last_alloc + 1;
Ryusuke Konishi619205d2011-05-05 01:23:57 +0900331 if (segnum < sui->allocmin || segnum > sui->allocmax)
332 segnum = sui->allocmin;
333
334 for (cnt = 0; cnt < nsegments; cnt += nsus) {
335 if (segnum > maxsegnum) {
336 if (cnt < sui->allocmax - sui->allocmin + 1) {
337 /*
338 * wrap around in the limited region.
339 * if allocation started from
340 * sui->allocmin, this never happens.
341 */
342 segnum = sui->allocmin;
343 maxsegnum = last_alloc;
344 } else if (segnum > sui->allocmin &&
345 sui->allocmax + 1 < nsegments) {
346 segnum = sui->allocmax + 1;
347 maxsegnum = nsegments - 1;
348 } else if (sui->allocmin > 0) {
349 segnum = 0;
350 maxsegnum = sui->allocmin - 1;
351 } else {
352 break; /* never happens */
353 }
Koji Sato6c98cd42009-04-06 19:01:32 -0700354 }
355 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1,
356 &su_bh);
357 if (ret < 0)
358 goto out_header;
359 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
360 su = nilfs_sufile_block_get_segment_usage(
361 sufile, segnum, su_bh, kaddr);
362
363 nsus = nilfs_sufile_segment_usages_in_block(
364 sufile, segnum, maxsegnum);
365 for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) {
366 if (!nilfs_segment_usage_clean(su))
367 continue;
368 /* found a clean segment */
Koji Sato6c98cd42009-04-06 19:01:32 -0700369 nilfs_segment_usage_set_dirty(su);
370 kunmap_atomic(kaddr, KM_USER0);
371
372 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
Ryusuke Konishi7b16c8a2009-11-13 03:10:21 +0900373 header = kaddr + bh_offset(header_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700374 le64_add_cpu(&header->sh_ncleansegs, -1);
375 le64_add_cpu(&header->sh_ndirtysegs, 1);
376 header->sh_last_alloc = cpu_to_le64(segnum);
377 kunmap_atomic(kaddr, KM_USER0);
378
Ryusuke Konishi619205d2011-05-05 01:23:57 +0900379 sui->ncleansegs--;
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900380 mark_buffer_dirty(header_bh);
381 mark_buffer_dirty(su_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700382 nilfs_mdt_mark_dirty(sufile);
383 brelse(su_bh);
384 *segnump = segnum;
385 goto out_header;
386 }
387
388 kunmap_atomic(kaddr, KM_USER0);
389 brelse(su_bh);
390 }
391
392 /* no segments left */
393 ret = -ENOSPC;
394
395 out_header:
396 brelse(header_bh);
397
398 out_sem:
399 up_write(&NILFS_MDT(sufile)->mi_sem);
400 return ret;
401}
402
Ryusuke Konishia7030182009-04-05 18:24:11 +0900403void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
404 struct buffer_head *header_bh,
405 struct buffer_head *su_bh)
Koji Sato6c98cd42009-04-06 19:01:32 -0700406{
Koji Sato6c98cd42009-04-06 19:01:32 -0700407 struct nilfs_segment_usage *su;
408 void *kaddr;
Koji Sato6c98cd42009-04-06 19:01:32 -0700409
410 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900411 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700412 if (unlikely(!nilfs_segment_usage_clean(su))) {
413 printk(KERN_WARNING "%s: segment %llu must be clean\n",
Koji Sato6c98cd42009-04-06 19:01:32 -0700414 __func__, (unsigned long long)segnum);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700415 kunmap_atomic(kaddr, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900416 return;
Koji Sato6c98cd42009-04-06 19:01:32 -0700417 }
418 nilfs_segment_usage_set_dirty(su);
419 kunmap_atomic(kaddr, KM_USER0);
420
Ryusuke Konishia7030182009-04-05 18:24:11 +0900421 nilfs_sufile_mod_counter(header_bh, -1, 1);
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900422 NILFS_SUI(sufile)->ncleansegs--;
423
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900424 mark_buffer_dirty(su_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700425 nilfs_mdt_mark_dirty(sufile);
Koji Sato6c98cd42009-04-06 19:01:32 -0700426}
427
Ryusuke Konishic85399c2009-04-05 18:30:58 +0900428void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
429 struct buffer_head *header_bh,
430 struct buffer_head *su_bh)
431{
432 struct nilfs_segment_usage *su;
433 void *kaddr;
434 int clean, dirty;
435
436 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
437 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
438 if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) &&
439 su->su_nblocks == cpu_to_le32(0)) {
440 kunmap_atomic(kaddr, KM_USER0);
441 return;
442 }
443 clean = nilfs_segment_usage_clean(su);
444 dirty = nilfs_segment_usage_dirty(su);
445
446 /* make the segment garbage */
447 su->su_lastmod = cpu_to_le64(0);
448 su->su_nblocks = cpu_to_le32(0);
449 su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY);
450 kunmap_atomic(kaddr, KM_USER0);
451
452 nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900453 NILFS_SUI(sufile)->ncleansegs -= clean;
454
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900455 mark_buffer_dirty(su_bh);
Ryusuke Konishic85399c2009-04-05 18:30:58 +0900456 nilfs_mdt_mark_dirty(sufile);
457}
458
Ryusuke Konishia7030182009-04-05 18:24:11 +0900459void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
460 struct buffer_head *header_bh,
461 struct buffer_head *su_bh)
Koji Sato6c98cd42009-04-06 19:01:32 -0700462{
Koji Sato6c98cd42009-04-06 19:01:32 -0700463 struct nilfs_segment_usage *su;
464 void *kaddr;
Ryusuke Konishia7030182009-04-05 18:24:11 +0900465 int sudirty;
Koji Sato6c98cd42009-04-06 19:01:32 -0700466
Ryusuke Konishia7030182009-04-05 18:24:11 +0900467 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
468 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
469 if (nilfs_segment_usage_clean(su)) {
470 printk(KERN_WARNING "%s: segment %llu is already clean\n",
471 __func__, (unsigned long long)segnum);
Koji Sato6c98cd42009-04-06 19:01:32 -0700472 kunmap_atomic(kaddr, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900473 return;
Koji Sato6c98cd42009-04-06 19:01:32 -0700474 }
Ryusuke Konishia7030182009-04-05 18:24:11 +0900475 WARN_ON(nilfs_segment_usage_error(su));
476 WARN_ON(!nilfs_segment_usage_dirty(su));
477
478 sudirty = nilfs_segment_usage_dirty(su);
479 nilfs_segment_usage_set_clean(su);
Koji Sato6c98cd42009-04-06 19:01:32 -0700480 kunmap_atomic(kaddr, KM_USER0);
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900481 mark_buffer_dirty(su_bh);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900482
483 nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900484 NILFS_SUI(sufile)->ncleansegs++;
485
Koji Sato6c98cd42009-04-06 19:01:32 -0700486 nilfs_mdt_mark_dirty(sufile);
Koji Sato6c98cd42009-04-06 19:01:32 -0700487}
488
489/**
Ryusuke Konishi61a189e2009-11-18 17:25:12 +0900490 * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
491 * @sufile: inode of segment usage file
492 * @segnum: segment number
493 */
494int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
495{
496 struct buffer_head *bh;
497 int ret;
498
499 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
500 if (!ret) {
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900501 mark_buffer_dirty(bh);
Ryusuke Konishi61a189e2009-11-18 17:25:12 +0900502 nilfs_mdt_mark_dirty(sufile);
503 brelse(bh);
504 }
505 return ret;
506}
507
508/**
Ryusuke Konishi071ec542009-11-18 18:23:34 +0900509 * nilfs_sufile_set_segment_usage - set usage of a segment
510 * @sufile: inode of segment usage file
511 * @segnum: segment number
512 * @nblocks: number of live blocks in the segment
513 * @modtime: modification time (option)
514 */
515int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
516 unsigned long nblocks, time_t modtime)
517{
518 struct buffer_head *bh;
519 struct nilfs_segment_usage *su;
520 void *kaddr;
521 int ret;
522
523 down_write(&NILFS_MDT(sufile)->mi_sem);
524 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
525 if (ret < 0)
526 goto out_sem;
527
528 kaddr = kmap_atomic(bh->b_page, KM_USER0);
529 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
530 WARN_ON(nilfs_segment_usage_error(su));
531 if (modtime)
532 su->su_lastmod = cpu_to_le64(modtime);
533 su->su_nblocks = cpu_to_le32(nblocks);
534 kunmap_atomic(kaddr, KM_USER0);
535
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900536 mark_buffer_dirty(bh);
Ryusuke Konishi071ec542009-11-18 18:23:34 +0900537 nilfs_mdt_mark_dirty(sufile);
538 brelse(bh);
539
540 out_sem:
541 up_write(&NILFS_MDT(sufile)->mi_sem);
542 return ret;
543}
544
545/**
Koji Sato6c98cd42009-04-06 19:01:32 -0700546 * nilfs_sufile_get_stat - get segment usage statistics
547 * @sufile: inode of segment usage file
548 * @stat: pointer to a structure of segment usage statistics
549 *
550 * Description: nilfs_sufile_get_stat() returns information about segment
551 * usage.
552 *
553 * Return Value: On success, 0 is returned, and segment usage information is
554 * stored in the place pointed by @stat. On error, one of the following
555 * negative error codes is returned.
556 *
557 * %-EIO - I/O error.
558 *
559 * %-ENOMEM - Insufficient amount of memory available.
560 */
561int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
562{
563 struct buffer_head *header_bh;
564 struct nilfs_sufile_header *header;
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +0900565 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
Koji Sato6c98cd42009-04-06 19:01:32 -0700566 void *kaddr;
567 int ret;
568
569 down_read(&NILFS_MDT(sufile)->mi_sem);
570
571 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
572 if (ret < 0)
573 goto out_sem;
574
575 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
Ryusuke Konishi7b16c8a2009-11-13 03:10:21 +0900576 header = kaddr + bh_offset(header_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700577 sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
578 sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
579 sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
Ryusuke Konishi2c2e52f2009-04-06 19:01:54 -0700580 sustat->ss_ctime = nilfs->ns_ctime;
581 sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime;
582 spin_lock(&nilfs->ns_last_segment_lock);
583 sustat->ss_prot_seq = nilfs->ns_prot_seq;
584 spin_unlock(&nilfs->ns_last_segment_lock);
Koji Sato6c98cd42009-04-06 19:01:32 -0700585 kunmap_atomic(kaddr, KM_USER0);
586 brelse(header_bh);
587
588 out_sem:
589 up_read(&NILFS_MDT(sufile)->mi_sem);
590 return ret;
591}
592
Ryusuke Konishia7030182009-04-05 18:24:11 +0900593void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
594 struct buffer_head *header_bh,
595 struct buffer_head *su_bh)
Koji Sato6c98cd42009-04-06 19:01:32 -0700596{
Koji Sato6c98cd42009-04-06 19:01:32 -0700597 struct nilfs_segment_usage *su;
Koji Sato6c98cd42009-04-06 19:01:32 -0700598 void *kaddr;
Ryusuke Konishia7030182009-04-05 18:24:11 +0900599 int suclean;
Koji Sato6c98cd42009-04-06 19:01:32 -0700600
601 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
602 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
603 if (nilfs_segment_usage_error(su)) {
604 kunmap_atomic(kaddr, KM_USER0);
Ryusuke Konishia7030182009-04-05 18:24:11 +0900605 return;
Koji Sato6c98cd42009-04-06 19:01:32 -0700606 }
Ryusuke Konishi88072fa2009-04-05 15:03:16 +0900607 suclean = nilfs_segment_usage_clean(su);
Koji Sato6c98cd42009-04-06 19:01:32 -0700608 nilfs_segment_usage_set_error(su);
609 kunmap_atomic(kaddr, KM_USER0);
Koji Sato6c98cd42009-04-06 19:01:32 -0700610
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900611 if (suclean) {
Ryusuke Konishia7030182009-04-05 18:24:11 +0900612 nilfs_sufile_mod_counter(header_bh, -1, 0);
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900613 NILFS_SUI(sufile)->ncleansegs--;
614 }
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900615 mark_buffer_dirty(su_bh);
Koji Sato6c98cd42009-04-06 19:01:32 -0700616 nilfs_mdt_mark_dirty(sufile);
Koji Sato6c98cd42009-04-06 19:01:32 -0700617}
618
619/**
Ryusuke Konishi78eb64c2011-05-05 01:23:58 +0900620 * nilfs_sufile_truncate_range - truncate range of segment array
621 * @sufile: inode of segment usage file
622 * @start: start segment number (inclusive)
623 * @end: end segment number (inclusive)
624 *
625 * Return Value: On success, 0 is returned. On error, one of the
626 * following negative error codes is returned.
627 *
628 * %-EIO - I/O error.
629 *
630 * %-ENOMEM - Insufficient amount of memory available.
631 *
632 * %-EINVAL - Invalid number of segments specified
633 *
634 * %-EBUSY - Dirty or active segments are present in the range
635 */
636static int nilfs_sufile_truncate_range(struct inode *sufile,
637 __u64 start, __u64 end)
638{
639 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
640 struct buffer_head *header_bh;
641 struct buffer_head *su_bh;
642 struct nilfs_segment_usage *su, *su2;
643 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
644 unsigned long segusages_per_block;
645 unsigned long nsegs, ncleaned;
646 __u64 segnum;
647 void *kaddr;
648 ssize_t n, nc;
649 int ret;
650 int j;
651
652 nsegs = nilfs_sufile_get_nsegments(sufile);
653
654 ret = -EINVAL;
655 if (start > end || start >= nsegs)
656 goto out;
657
658 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
659 if (ret < 0)
660 goto out;
661
662 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
663 ncleaned = 0;
664
665 for (segnum = start; segnum <= end; segnum += n) {
666 n = min_t(unsigned long,
667 segusages_per_block -
668 nilfs_sufile_get_offset(sufile, segnum),
669 end - segnum + 1);
670 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
671 &su_bh);
672 if (ret < 0) {
673 if (ret != -ENOENT)
674 goto out_header;
675 /* hole */
676 continue;
677 }
678 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
679 su = nilfs_sufile_block_get_segment_usage(
680 sufile, segnum, su_bh, kaddr);
681 su2 = su;
682 for (j = 0; j < n; j++, su = (void *)su + susz) {
683 if ((le32_to_cpu(su->su_flags) &
684 ~(1UL << NILFS_SEGMENT_USAGE_ERROR)) ||
685 nilfs_segment_is_active(nilfs, segnum + j)) {
686 ret = -EBUSY;
687 kunmap_atomic(kaddr, KM_USER0);
688 brelse(su_bh);
689 goto out_header;
690 }
691 }
692 nc = 0;
693 for (su = su2, j = 0; j < n; j++, su = (void *)su + susz) {
694 if (nilfs_segment_usage_error(su)) {
695 nilfs_segment_usage_set_clean(su);
696 nc++;
697 }
698 }
699 kunmap_atomic(kaddr, KM_USER0);
700 if (nc > 0) {
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900701 mark_buffer_dirty(su_bh);
Ryusuke Konishi78eb64c2011-05-05 01:23:58 +0900702 ncleaned += nc;
703 }
704 brelse(su_bh);
705
706 if (n == segusages_per_block) {
707 /* make hole */
708 nilfs_sufile_delete_segment_usage_block(sufile, segnum);
709 }
710 }
711 ret = 0;
712
713out_header:
714 if (ncleaned > 0) {
715 NILFS_SUI(sufile)->ncleansegs += ncleaned;
716 nilfs_sufile_mod_counter(header_bh, ncleaned, 0);
717 nilfs_mdt_mark_dirty(sufile);
718 }
719 brelse(header_bh);
720out:
721 return ret;
722}
723
724/**
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +0900725 * nilfs_sufile_resize - resize segment array
726 * @sufile: inode of segment usage file
727 * @newnsegs: new number of segments
728 *
729 * Return Value: On success, 0 is returned. On error, one of the
730 * following negative error codes is returned.
731 *
732 * %-EIO - I/O error.
733 *
734 * %-ENOMEM - Insufficient amount of memory available.
735 *
736 * %-ENOSPC - Enough free space is not left for shrinking
737 *
738 * %-EBUSY - Dirty or active segments exist in the region to be truncated
739 */
740int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs)
741{
742 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
743 struct buffer_head *header_bh;
744 struct nilfs_sufile_header *header;
745 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
746 void *kaddr;
747 unsigned long nsegs, nrsvsegs;
748 int ret = 0;
749
750 down_write(&NILFS_MDT(sufile)->mi_sem);
751
752 nsegs = nilfs_sufile_get_nsegments(sufile);
753 if (nsegs == newnsegs)
754 goto out;
755
756 ret = -ENOSPC;
757 nrsvsegs = nilfs_nrsvsegs(nilfs, newnsegs);
758 if (newnsegs < nsegs && nsegs - newnsegs + nrsvsegs > sui->ncleansegs)
759 goto out;
760
761 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
762 if (ret < 0)
763 goto out;
764
765 if (newnsegs > nsegs) {
766 sui->ncleansegs += newnsegs - nsegs;
767 } else /* newnsegs < nsegs */ {
768 ret = nilfs_sufile_truncate_range(sufile, newnsegs, nsegs - 1);
769 if (ret < 0)
770 goto out_header;
771
772 sui->ncleansegs -= nsegs - newnsegs;
773 }
774
775 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
776 header = kaddr + bh_offset(header_bh);
777 header->sh_ncleansegs = cpu_to_le64(sui->ncleansegs);
778 kunmap_atomic(kaddr, KM_USER0);
779
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900780 mark_buffer_dirty(header_bh);
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +0900781 nilfs_mdt_mark_dirty(sufile);
782 nilfs_set_nsegments(nilfs, newnsegs);
783
784out_header:
785 brelse(header_bh);
786out:
787 up_write(&NILFS_MDT(sufile)->mi_sem);
788 return ret;
789}
790
791/**
Koji Sato6c98cd42009-04-06 19:01:32 -0700792 * nilfs_sufile_get_suinfo -
793 * @sufile: inode of segment usage file
794 * @segnum: segment number to start looking
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900795 * @buf: array of suinfo
796 * @sisz: byte size of suinfo
Koji Sato6c98cd42009-04-06 19:01:32 -0700797 * @nsi: size of suinfo array
798 *
799 * Description:
800 *
801 * Return Value: On success, 0 is returned and .... On error, one of the
802 * following negative error codes is returned.
803 *
804 * %-EIO - I/O error.
805 *
806 * %-ENOMEM - Insufficient amount of memory available.
807 */
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900808ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
809 unsigned sisz, size_t nsi)
Koji Sato6c98cd42009-04-06 19:01:32 -0700810{
811 struct buffer_head *su_bh;
812 struct nilfs_segment_usage *su;
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900813 struct nilfs_suinfo *si = buf;
Koji Sato6c98cd42009-04-06 19:01:32 -0700814 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
Ryusuke Konishi0ef28f92011-05-05 12:56:51 +0900815 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
Koji Sato6c98cd42009-04-06 19:01:32 -0700816 void *kaddr;
817 unsigned long nsegs, segusages_per_block;
818 ssize_t n;
819 int ret, i, j;
820
821 down_read(&NILFS_MDT(sufile)->mi_sem);
822
823 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
824 nsegs = min_t(unsigned long,
825 nilfs_sufile_get_nsegments(sufile) - segnum,
826 nsi);
827 for (i = 0; i < nsegs; i += n, segnum += n) {
828 n = min_t(unsigned long,
829 segusages_per_block -
830 nilfs_sufile_get_offset(sufile, segnum),
831 nsegs - i);
832 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
833 &su_bh);
834 if (ret < 0) {
835 if (ret != -ENOENT)
836 goto out;
837 /* hole */
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900838 memset(si, 0, sisz * n);
839 si = (void *)si + sisz * n;
Koji Sato6c98cd42009-04-06 19:01:32 -0700840 continue;
841 }
842
843 kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
844 su = nilfs_sufile_block_get_segment_usage(
845 sufile, segnum, su_bh, kaddr);
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900846 for (j = 0; j < n;
847 j++, su = (void *)su + susz, si = (void *)si + sisz) {
848 si->sui_lastmod = le64_to_cpu(su->su_lastmod);
849 si->sui_nblocks = le32_to_cpu(su->su_nblocks);
850 si->sui_flags = le32_to_cpu(su->su_flags) &
Ryusuke Konishicece5522009-04-06 19:01:58 -0700851 ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
Ryusuke Konishi3efb55b42009-03-30 00:50:19 +0900852 if (nilfs_segment_is_active(nilfs, segnum + j))
Ryusuke Konishi003ff182009-05-12 03:58:47 +0900853 si->sui_flags |=
Ryusuke Konishicece5522009-04-06 19:01:58 -0700854 (1UL << NILFS_SEGMENT_USAGE_ACTIVE);
Koji Sato6c98cd42009-04-06 19:01:32 -0700855 }
856 kunmap_atomic(kaddr, KM_USER0);
857 brelse(su_bh);
858 }
859 ret = nsegs;
860
861 out:
862 up_read(&NILFS_MDT(sufile)->mi_sem);
863 return ret;
864}
Ryusuke Konishi79739562009-11-12 23:56:43 +0900865
866/**
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900867 * nilfs_sufile_read - read or get sufile inode
868 * @sb: super block instance
869 * @susize: size of a segment usage entry
Ryusuke Konishi8707df32009-11-13 01:36:56 +0900870 * @raw_inode: on-disk sufile inode
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900871 * @inodep: buffer to store the inode
Ryusuke Konishi8707df32009-11-13 01:36:56 +0900872 */
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900873int nilfs_sufile_read(struct super_block *sb, size_t susize,
874 struct nilfs_inode *raw_inode, struct inode **inodep)
Ryusuke Konishi8707df32009-11-13 01:36:56 +0900875{
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900876 struct inode *sufile;
877 struct nilfs_sufile_info *sui;
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900878 struct buffer_head *header_bh;
879 struct nilfs_sufile_header *header;
880 void *kaddr;
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900881 int err;
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900882
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900883 sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
884 if (unlikely(!sufile))
885 return -ENOMEM;
886 if (!(sufile->i_state & I_NEW))
887 goto out;
Ryusuke Konishiaa474a22009-11-13 03:41:55 +0900888
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900889 err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui));
890 if (err)
891 goto failed;
Ryusuke Konishi8707df32009-11-13 01:36:56 +0900892
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900893 nilfs_mdt_set_entry_size(sufile, susize,
894 sizeof(struct nilfs_sufile_header));
Ryusuke Konishi79739562009-11-12 23:56:43 +0900895
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900896 err = nilfs_read_inode_common(sufile, raw_inode);
897 if (err)
898 goto failed;
899
900 err = nilfs_sufile_get_header_block(sufile, &header_bh);
901 if (err)
902 goto failed;
903
904 sui = NILFS_SUI(sufile);
905 kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
906 header = kaddr + bh_offset(header_bh);
907 sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
908 kunmap_atomic(kaddr, KM_USER0);
909 brelse(header_bh);
910
Ryusuke Konishi619205d2011-05-05 01:23:57 +0900911 sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1;
912 sui->allocmin = 0;
913
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900914 unlock_new_inode(sufile);
915 out:
916 *inodep = sufile;
917 return 0;
918 failed:
919 iget_failed(sufile);
920 return err;
Ryusuke Konishi79739562009-11-12 23:56:43 +0900921}