1 // SPDX-License-Identifier: GPL-2.0+
3 * sufile.c - NILFS segment usage file.
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
7 * Written by Koji Sato.
8 * Revised by Ryusuke Konishi.
11 #include <linux/kernel.h>
13 #include <linux/string.h>
14 #include <linux/buffer_head.h>
15 #include <linux/errno.h>
19 #include <trace/events/nilfs2.h>
22 * struct nilfs_sufile_info - on-memory private data of sufile
23 * @mi: on-memory private data of metadata file
24 * @ncleansegs: number of clean segments
25 * @allocmin: lower limit of allocatable segment range
26 * @allocmax: upper limit of allocatable segment range
28 struct nilfs_sufile_info {
29 struct nilfs_mdt_info mi;
30 unsigned long ncleansegs;/* number of clean segments */
31 __u64 allocmin; /* lower limit of allocatable segment range */
32 __u64 allocmax; /* upper limit of allocatable segment range */
35 static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile)
37 return (struct nilfs_sufile_info *)NILFS_MDT(sufile);
40 static inline unsigned long
41 nilfs_sufile_segment_usages_per_block(const struct inode *sufile)
43 return NILFS_MDT(sufile)->mi_entries_per_block;
47 nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum)
49 __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
51 do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
52 return (unsigned long)t;
56 nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum)
58 __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
60 return do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
64 nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr,
67 return min_t(unsigned long,
68 nilfs_sufile_segment_usages_per_block(sufile) -
69 nilfs_sufile_get_offset(sufile, curr),
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)
77 return kaddr + bh_offset(bh) +
78 nilfs_sufile_get_offset(sufile, segnum) *
79 NILFS_MDT(sufile)->mi_entry_size;
82 static inline int nilfs_sufile_get_header_block(struct inode *sufile,
83 struct buffer_head **bhp)
85 return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp);
89 nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum,
90 int create, struct buffer_head **bhp)
92 return nilfs_mdt_get_block(sufile,
93 nilfs_sufile_get_blkoff(sufile, segnum),
97 static int nilfs_sufile_delete_segment_usage_block(struct inode *sufile,
100 return nilfs_mdt_delete_block(sufile,
101 nilfs_sufile_get_blkoff(sufile, segnum));
104 static void nilfs_sufile_mod_counter(struct buffer_head *header_bh,
105 u64 ncleanadd, u64 ndirtyadd)
107 struct nilfs_sufile_header *header;
110 kaddr = kmap_atomic(header_bh->b_page);
111 header = kaddr + bh_offset(header_bh);
112 le64_add_cpu(&header->sh_ncleansegs, ncleanadd);
113 le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd);
114 kunmap_atomic(kaddr);
116 mark_buffer_dirty(header_bh);
120 * nilfs_sufile_get_ncleansegs - return the number of clean segments
121 * @sufile: inode of segment usage file
123 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile)
125 return NILFS_SUI(sufile)->ncleansegs;
129 * nilfs_sufile_updatev - modify multiple segment usages at a time
130 * @sufile: inode of segment usage file
131 * @segnumv: array of segment numbers
132 * @nsegs: size of @segnumv array
133 * @create: creation flag
134 * @ndone: place to store number of modified segments on @segnumv
135 * @dofunc: primitive operation for the update
137 * Description: nilfs_sufile_updatev() repeatedly calls @dofunc
138 * against the given array of segments. The @dofunc is called with
139 * buffers of a header block and the sufile block in which the target
140 * segment usage entry is contained. If @ndone is given, the number
141 * of successfully modified segments from the head is stored in the
142 * place @ndone points to.
144 * Return Value: On success, zero is returned. On error, one of the
145 * following negative error codes is returned.
149 * %-ENOMEM - Insufficient amount of memory available.
151 * %-ENOENT - Given segment usage is in hole block (may be returned if
154 * %-EINVAL - Invalid segment usage number
156 int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs,
157 int create, size_t *ndone,
158 void (*dofunc)(struct inode *, __u64,
159 struct buffer_head *,
160 struct buffer_head *))
162 struct buffer_head *header_bh, *bh;
163 unsigned long blkoff, prev_blkoff;
165 size_t nerr = 0, n = 0;
168 if (unlikely(nsegs == 0))
171 down_write(&NILFS_MDT(sufile)->mi_sem);
172 for (seg = segnumv; seg < segnumv + nsegs; seg++) {
173 if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) {
174 nilfs_warn(sufile->i_sb,
175 "%s: invalid segment number: %llu",
176 __func__, (unsigned long long)*seg);
185 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
190 blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
191 ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
196 dofunc(sufile, *seg, header_bh, bh);
198 if (++seg >= segnumv + nsegs)
200 prev_blkoff = blkoff;
201 blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
202 if (blkoff == prev_blkoff)
205 /* get different block */
207 ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
208 if (unlikely(ret < 0))
217 up_write(&NILFS_MDT(sufile)->mi_sem);
224 int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create,
225 void (*dofunc)(struct inode *, __u64,
226 struct buffer_head *,
227 struct buffer_head *))
229 struct buffer_head *header_bh, *bh;
232 if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
233 nilfs_warn(sufile->i_sb, "%s: invalid segment number: %llu",
234 __func__, (unsigned long long)segnum);
237 down_write(&NILFS_MDT(sufile)->mi_sem);
239 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
243 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh);
245 dofunc(sufile, segnum, header_bh, bh);
251 up_write(&NILFS_MDT(sufile)->mi_sem);
256 * nilfs_sufile_set_alloc_range - limit range of segment to be allocated
257 * @sufile: inode of segment usage file
258 * @start: minimum segment number of allocatable region (inclusive)
259 * @end: maximum segment number of allocatable region (inclusive)
261 * Return Value: On success, 0 is returned. On error, one of the
262 * following negative error codes is returned.
264 * %-ERANGE - invalid segment region
266 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end)
268 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
272 down_write(&NILFS_MDT(sufile)->mi_sem);
273 nsegs = nilfs_sufile_get_nsegments(sufile);
275 if (start <= end && end < nsegs) {
276 sui->allocmin = start;
280 up_write(&NILFS_MDT(sufile)->mi_sem);
285 * nilfs_sufile_alloc - allocate a segment
286 * @sufile: inode of segment usage file
287 * @segnump: pointer to segment number
289 * Description: nilfs_sufile_alloc() allocates a clean segment.
291 * Return Value: On success, 0 is returned and the segment number of the
292 * allocated segment is stored in the place pointed by @segnump. On error, one
293 * of the following negative error codes is returned.
297 * %-ENOMEM - Insufficient amount of memory available.
299 * %-ENOSPC - No clean segment left.
301 int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
303 struct buffer_head *header_bh, *su_bh;
304 struct nilfs_sufile_header *header;
305 struct nilfs_segment_usage *su;
306 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
307 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
308 __u64 segnum, maxsegnum, last_alloc;
310 unsigned long nsegments, nsus, cnt;
313 down_write(&NILFS_MDT(sufile)->mi_sem);
315 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
318 kaddr = kmap_atomic(header_bh->b_page);
319 header = kaddr + bh_offset(header_bh);
320 last_alloc = le64_to_cpu(header->sh_last_alloc);
321 kunmap_atomic(kaddr);
323 nsegments = nilfs_sufile_get_nsegments(sufile);
324 maxsegnum = sui->allocmax;
325 segnum = last_alloc + 1;
326 if (segnum < sui->allocmin || segnum > sui->allocmax)
327 segnum = sui->allocmin;
329 for (cnt = 0; cnt < nsegments; cnt += nsus) {
330 if (segnum > maxsegnum) {
331 if (cnt < sui->allocmax - sui->allocmin + 1) {
333 * wrap around in the limited region.
334 * if allocation started from
335 * sui->allocmin, this never happens.
337 segnum = sui->allocmin;
338 maxsegnum = last_alloc;
339 } else if (segnum > sui->allocmin &&
340 sui->allocmax + 1 < nsegments) {
341 segnum = sui->allocmax + 1;
342 maxsegnum = nsegments - 1;
343 } else if (sui->allocmin > 0) {
345 maxsegnum = sui->allocmin - 1;
347 break; /* never happens */
350 trace_nilfs2_segment_usage_check(sufile, segnum, cnt);
351 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1,
355 kaddr = kmap_atomic(su_bh->b_page);
356 su = nilfs_sufile_block_get_segment_usage(
357 sufile, segnum, su_bh, kaddr);
359 nsus = nilfs_sufile_segment_usages_in_block(
360 sufile, segnum, maxsegnum);
361 for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) {
362 if (!nilfs_segment_usage_clean(su))
364 /* found a clean segment */
365 nilfs_segment_usage_set_dirty(su);
366 kunmap_atomic(kaddr);
368 kaddr = kmap_atomic(header_bh->b_page);
369 header = kaddr + bh_offset(header_bh);
370 le64_add_cpu(&header->sh_ncleansegs, -1);
371 le64_add_cpu(&header->sh_ndirtysegs, 1);
372 header->sh_last_alloc = cpu_to_le64(segnum);
373 kunmap_atomic(kaddr);
376 mark_buffer_dirty(header_bh);
377 mark_buffer_dirty(su_bh);
378 nilfs_mdt_mark_dirty(sufile);
382 trace_nilfs2_segment_usage_allocated(sufile, segnum);
387 kunmap_atomic(kaddr);
391 /* no segments left */
398 up_write(&NILFS_MDT(sufile)->mi_sem);
402 void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
403 struct buffer_head *header_bh,
404 struct buffer_head *su_bh)
406 struct nilfs_segment_usage *su;
409 kaddr = kmap_atomic(su_bh->b_page);
410 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
411 if (unlikely(!nilfs_segment_usage_clean(su))) {
412 nilfs_warn(sufile->i_sb, "%s: segment %llu must be clean",
413 __func__, (unsigned long long)segnum);
414 kunmap_atomic(kaddr);
417 nilfs_segment_usage_set_dirty(su);
418 kunmap_atomic(kaddr);
420 nilfs_sufile_mod_counter(header_bh, -1, 1);
421 NILFS_SUI(sufile)->ncleansegs--;
423 mark_buffer_dirty(su_bh);
424 nilfs_mdt_mark_dirty(sufile);
427 void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
428 struct buffer_head *header_bh,
429 struct buffer_head *su_bh)
431 struct nilfs_segment_usage *su;
435 kaddr = kmap_atomic(su_bh->b_page);
436 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
437 if (su->su_flags == cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY)) &&
438 su->su_nblocks == cpu_to_le32(0)) {
439 kunmap_atomic(kaddr);
442 clean = nilfs_segment_usage_clean(su);
443 dirty = nilfs_segment_usage_dirty(su);
445 /* make the segment garbage */
446 su->su_lastmod = cpu_to_le64(0);
447 su->su_nblocks = cpu_to_le32(0);
448 su->su_flags = cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY));
449 kunmap_atomic(kaddr);
451 nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
452 NILFS_SUI(sufile)->ncleansegs -= clean;
454 mark_buffer_dirty(su_bh);
455 nilfs_mdt_mark_dirty(sufile);
458 void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
459 struct buffer_head *header_bh,
460 struct buffer_head *su_bh)
462 struct nilfs_segment_usage *su;
466 kaddr = kmap_atomic(su_bh->b_page);
467 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
468 if (nilfs_segment_usage_clean(su)) {
469 nilfs_warn(sufile->i_sb, "%s: segment %llu is already clean",
470 __func__, (unsigned long long)segnum);
471 kunmap_atomic(kaddr);
474 WARN_ON(nilfs_segment_usage_error(su));
475 WARN_ON(!nilfs_segment_usage_dirty(su));
477 sudirty = nilfs_segment_usage_dirty(su);
478 nilfs_segment_usage_set_clean(su);
479 kunmap_atomic(kaddr);
480 mark_buffer_dirty(su_bh);
482 nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
483 NILFS_SUI(sufile)->ncleansegs++;
485 nilfs_mdt_mark_dirty(sufile);
487 trace_nilfs2_segment_usage_freed(sufile, segnum);
491 * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
492 * @sufile: inode of segment usage file
493 * @segnum: segment number
495 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
497 struct buffer_head *bh;
500 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
502 mark_buffer_dirty(bh);
503 nilfs_mdt_mark_dirty(sufile);
510 * nilfs_sufile_set_segment_usage - set usage of a segment
511 * @sufile: inode of segment usage file
512 * @segnum: segment number
513 * @nblocks: number of live blocks in the segment
514 * @modtime: modification time (option)
516 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
517 unsigned long nblocks, time64_t modtime)
519 struct buffer_head *bh;
520 struct nilfs_segment_usage *su;
524 down_write(&NILFS_MDT(sufile)->mi_sem);
525 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
529 kaddr = kmap_atomic(bh->b_page);
530 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
531 WARN_ON(nilfs_segment_usage_error(su));
533 su->su_lastmod = cpu_to_le64(modtime);
534 su->su_nblocks = cpu_to_le32(nblocks);
535 kunmap_atomic(kaddr);
537 mark_buffer_dirty(bh);
538 nilfs_mdt_mark_dirty(sufile);
542 up_write(&NILFS_MDT(sufile)->mi_sem);
547 * nilfs_sufile_get_stat - get segment usage statistics
548 * @sufile: inode of segment usage file
549 * @sustat: pointer to a structure of segment usage statistics
551 * Description: nilfs_sufile_get_stat() returns information about segment
554 * Return Value: On success, 0 is returned, and segment usage information is
555 * stored in the place pointed by @sustat. On error, one of the following
556 * negative error codes is returned.
560 * %-ENOMEM - Insufficient amount of memory available.
562 int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
564 struct buffer_head *header_bh;
565 struct nilfs_sufile_header *header;
566 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
570 down_read(&NILFS_MDT(sufile)->mi_sem);
572 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
576 kaddr = kmap_atomic(header_bh->b_page);
577 header = kaddr + bh_offset(header_bh);
578 sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
579 sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
580 sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
581 sustat->ss_ctime = nilfs->ns_ctime;
582 sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime;
583 spin_lock(&nilfs->ns_last_segment_lock);
584 sustat->ss_prot_seq = nilfs->ns_prot_seq;
585 spin_unlock(&nilfs->ns_last_segment_lock);
586 kunmap_atomic(kaddr);
590 up_read(&NILFS_MDT(sufile)->mi_sem);
594 void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
595 struct buffer_head *header_bh,
596 struct buffer_head *su_bh)
598 struct nilfs_segment_usage *su;
602 kaddr = kmap_atomic(su_bh->b_page);
603 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
604 if (nilfs_segment_usage_error(su)) {
605 kunmap_atomic(kaddr);
608 suclean = nilfs_segment_usage_clean(su);
609 nilfs_segment_usage_set_error(su);
610 kunmap_atomic(kaddr);
613 nilfs_sufile_mod_counter(header_bh, -1, 0);
614 NILFS_SUI(sufile)->ncleansegs--;
616 mark_buffer_dirty(su_bh);
617 nilfs_mdt_mark_dirty(sufile);
621 * nilfs_sufile_truncate_range - truncate range of segment array
622 * @sufile: inode of segment usage file
623 * @start: start segment number (inclusive)
624 * @end: end segment number (inclusive)
626 * Return Value: On success, 0 is returned. On error, one of the
627 * following negative error codes is returned.
631 * %-ENOMEM - Insufficient amount of memory available.
633 * %-EINVAL - Invalid number of segments specified
635 * %-EBUSY - Dirty or active segments are present in the range
637 static int nilfs_sufile_truncate_range(struct inode *sufile,
638 __u64 start, __u64 end)
640 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
641 struct buffer_head *header_bh;
642 struct buffer_head *su_bh;
643 struct nilfs_segment_usage *su, *su2;
644 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
645 unsigned long segusages_per_block;
646 unsigned long nsegs, ncleaned;
653 nsegs = nilfs_sufile_get_nsegments(sufile);
656 if (start > end || start >= nsegs)
659 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
663 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
666 for (segnum = start; segnum <= end; segnum += n) {
667 n = min_t(unsigned long,
668 segusages_per_block -
669 nilfs_sufile_get_offset(sufile, segnum),
671 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
679 kaddr = kmap_atomic(su_bh->b_page);
680 su = nilfs_sufile_block_get_segment_usage(
681 sufile, segnum, su_bh, kaddr);
683 for (j = 0; j < n; j++, su = (void *)su + susz) {
684 if ((le32_to_cpu(su->su_flags) &
685 ~BIT(NILFS_SEGMENT_USAGE_ERROR)) ||
686 nilfs_segment_is_active(nilfs, segnum + j)) {
688 kunmap_atomic(kaddr);
694 for (su = su2, j = 0; j < n; j++, su = (void *)su + susz) {
695 if (nilfs_segment_usage_error(su)) {
696 nilfs_segment_usage_set_clean(su);
700 kunmap_atomic(kaddr);
702 mark_buffer_dirty(su_bh);
707 if (n == segusages_per_block) {
709 nilfs_sufile_delete_segment_usage_block(sufile, segnum);
716 NILFS_SUI(sufile)->ncleansegs += ncleaned;
717 nilfs_sufile_mod_counter(header_bh, ncleaned, 0);
718 nilfs_mdt_mark_dirty(sufile);
726 * nilfs_sufile_resize - resize segment array
727 * @sufile: inode of segment usage file
728 * @newnsegs: new number of segments
730 * Return Value: On success, 0 is returned. On error, one of the
731 * following negative error codes is returned.
735 * %-ENOMEM - Insufficient amount of memory available.
737 * %-ENOSPC - Enough free space is not left for shrinking
739 * %-EBUSY - Dirty or active segments exist in the region to be truncated
741 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs)
743 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
744 struct buffer_head *header_bh;
745 struct nilfs_sufile_header *header;
746 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
748 unsigned long nsegs, nrsvsegs;
751 down_write(&NILFS_MDT(sufile)->mi_sem);
753 nsegs = nilfs_sufile_get_nsegments(sufile);
754 if (nsegs == newnsegs)
758 nrsvsegs = nilfs_nrsvsegs(nilfs, newnsegs);
759 if (newnsegs < nsegs && nsegs - newnsegs + nrsvsegs > sui->ncleansegs)
762 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
766 if (newnsegs > nsegs) {
767 sui->ncleansegs += newnsegs - nsegs;
768 } else /* newnsegs < nsegs */ {
769 ret = nilfs_sufile_truncate_range(sufile, newnsegs, nsegs - 1);
773 sui->ncleansegs -= nsegs - newnsegs;
776 kaddr = kmap_atomic(header_bh->b_page);
777 header = kaddr + bh_offset(header_bh);
778 header->sh_ncleansegs = cpu_to_le64(sui->ncleansegs);
779 kunmap_atomic(kaddr);
781 mark_buffer_dirty(header_bh);
782 nilfs_mdt_mark_dirty(sufile);
783 nilfs_set_nsegments(nilfs, newnsegs);
788 up_write(&NILFS_MDT(sufile)->mi_sem);
793 * nilfs_sufile_get_suinfo -
794 * @sufile: inode of segment usage file
795 * @segnum: segment number to start looking
796 * @buf: array of suinfo
797 * @sisz: byte size of suinfo
798 * @nsi: size of suinfo array
802 * Return Value: On success, 0 is returned and .... On error, one of the
803 * following negative error codes is returned.
807 * %-ENOMEM - Insufficient amount of memory available.
809 ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
810 unsigned int sisz, size_t nsi)
812 struct buffer_head *su_bh;
813 struct nilfs_segment_usage *su;
814 struct nilfs_suinfo *si = buf;
815 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
816 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
818 unsigned long nsegs, segusages_per_block;
822 down_read(&NILFS_MDT(sufile)->mi_sem);
824 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
825 nsegs = min_t(unsigned long,
826 nilfs_sufile_get_nsegments(sufile) - segnum,
828 for (i = 0; i < nsegs; i += n, segnum += n) {
829 n = min_t(unsigned long,
830 segusages_per_block -
831 nilfs_sufile_get_offset(sufile, segnum),
833 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
839 memset(si, 0, sisz * n);
840 si = (void *)si + sisz * n;
844 kaddr = kmap_atomic(su_bh->b_page);
845 su = nilfs_sufile_block_get_segment_usage(
846 sufile, segnum, su_bh, kaddr);
848 j++, su = (void *)su + susz, si = (void *)si + sisz) {
849 si->sui_lastmod = le64_to_cpu(su->su_lastmod);
850 si->sui_nblocks = le32_to_cpu(su->su_nblocks);
851 si->sui_flags = le32_to_cpu(su->su_flags) &
852 ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
853 if (nilfs_segment_is_active(nilfs, segnum + j))
855 BIT(NILFS_SEGMENT_USAGE_ACTIVE);
857 kunmap_atomic(kaddr);
863 up_read(&NILFS_MDT(sufile)->mi_sem);
868 * nilfs_sufile_set_suinfo - sets segment usage info
869 * @sufile: inode of segment usage file
870 * @buf: array of suinfo_update
871 * @supsz: byte size of suinfo_update
872 * @nsup: size of suinfo_update array
874 * Description: Takes an array of nilfs_suinfo_update structs and updates
875 * segment usage accordingly. Only the fields indicated by the sup_flags
878 * Return Value: On success, 0 is returned. On error, one of the
879 * following negative error codes is returned.
883 * %-ENOMEM - Insufficient amount of memory available.
885 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
887 ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
888 unsigned int supsz, size_t nsup)
890 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
891 struct buffer_head *header_bh, *bh;
892 struct nilfs_suinfo_update *sup, *supend = buf + supsz * nsup;
893 struct nilfs_segment_usage *su;
895 unsigned long blkoff, prev_blkoff;
896 int cleansi, cleansu, dirtysi, dirtysu;
897 long ncleaned = 0, ndirtied = 0;
900 if (unlikely(nsup == 0))
903 for (sup = buf; sup < supend; sup = (void *)sup + supsz) {
904 if (sup->sup_segnum >= nilfs->ns_nsegments
906 (~0UL << __NR_NILFS_SUINFO_UPDATE_FIELDS))
907 || (nilfs_suinfo_update_nblocks(sup) &&
908 sup->sup_sui.sui_nblocks >
909 nilfs->ns_blocks_per_segment))
913 down_write(&NILFS_MDT(sufile)->mi_sem);
915 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
920 blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
921 ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
926 kaddr = kmap_atomic(bh->b_page);
927 su = nilfs_sufile_block_get_segment_usage(
928 sufile, sup->sup_segnum, bh, kaddr);
930 if (nilfs_suinfo_update_lastmod(sup))
931 su->su_lastmod = cpu_to_le64(sup->sup_sui.sui_lastmod);
933 if (nilfs_suinfo_update_nblocks(sup))
934 su->su_nblocks = cpu_to_le32(sup->sup_sui.sui_nblocks);
936 if (nilfs_suinfo_update_flags(sup)) {
938 * Active flag is a virtual flag projected by running
939 * nilfs kernel code - drop it not to write it to
942 sup->sup_sui.sui_flags &=
943 ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
945 cleansi = nilfs_suinfo_clean(&sup->sup_sui);
946 cleansu = nilfs_segment_usage_clean(su);
947 dirtysi = nilfs_suinfo_dirty(&sup->sup_sui);
948 dirtysu = nilfs_segment_usage_dirty(su);
950 if (cleansi && !cleansu)
952 else if (!cleansi && cleansu)
955 if (dirtysi && !dirtysu)
957 else if (!dirtysi && dirtysu)
960 su->su_flags = cpu_to_le32(sup->sup_sui.sui_flags);
963 kunmap_atomic(kaddr);
965 sup = (void *)sup + supsz;
969 prev_blkoff = blkoff;
970 blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
971 if (blkoff == prev_blkoff)
974 /* get different block */
975 mark_buffer_dirty(bh);
977 ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
978 if (unlikely(ret < 0))
981 mark_buffer_dirty(bh);
985 if (ncleaned || ndirtied) {
986 nilfs_sufile_mod_counter(header_bh, (u64)ncleaned,
988 NILFS_SUI(sufile)->ncleansegs += ncleaned;
990 nilfs_mdt_mark_dirty(sufile);
994 up_write(&NILFS_MDT(sufile)->mi_sem);
999 * nilfs_sufile_trim_fs() - trim ioctl handle function
1000 * @sufile: inode of segment usage file
1001 * @range: fstrim_range structure
1003 * start: First Byte to trim
1004 * len: number of Bytes to trim from start
1005 * minlen: minimum extent length in Bytes
1007 * Decription: nilfs_sufile_trim_fs goes through all segments containing bytes
1008 * from start to start+len. start is rounded up to the next block boundary
1009 * and start+len is rounded down. For each clean segment blkdev_issue_discard
1010 * function is invoked.
1012 * Return Value: On success, 0 is returned or negative error code, otherwise.
1014 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range)
1016 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
1017 struct buffer_head *su_bh;
1018 struct nilfs_segment_usage *su;
1020 size_t n, i, susz = NILFS_MDT(sufile)->mi_entry_size;
1021 sector_t seg_start, seg_end, start_block, end_block;
1022 sector_t start = 0, nblocks = 0;
1023 u64 segnum, segnum_end, minlen, len, max_blocks, ndiscarded = 0;
1025 unsigned int sects_per_block;
1027 sects_per_block = (1 << nilfs->ns_blocksize_bits) /
1028 bdev_logical_block_size(nilfs->ns_bdev);
1029 len = range->len >> nilfs->ns_blocksize_bits;
1030 minlen = range->minlen >> nilfs->ns_blocksize_bits;
1031 max_blocks = ((u64)nilfs->ns_nsegments * nilfs->ns_blocks_per_segment);
1033 if (!len || range->start >= max_blocks << nilfs->ns_blocksize_bits)
1036 start_block = (range->start + nilfs->ns_blocksize - 1) >>
1037 nilfs->ns_blocksize_bits;
1040 * range->len can be very large (actually, it is set to
1041 * ULLONG_MAX by default) - truncate upper end of the range
1042 * carefully so as not to overflow.
1044 if (max_blocks - start_block < len)
1045 end_block = max_blocks - 1;
1047 end_block = start_block + len - 1;
1049 segnum = nilfs_get_segnum_of_block(nilfs, start_block);
1050 segnum_end = nilfs_get_segnum_of_block(nilfs, end_block);
1052 down_read(&NILFS_MDT(sufile)->mi_sem);
1054 while (segnum <= segnum_end) {
1055 n = nilfs_sufile_segment_usages_in_block(sufile, segnum,
1058 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
1068 kaddr = kmap_atomic(su_bh->b_page);
1069 su = nilfs_sufile_block_get_segment_usage(sufile, segnum,
1071 for (i = 0; i < n; ++i, ++segnum, su = (void *)su + susz) {
1072 if (!nilfs_segment_usage_clean(su))
1075 nilfs_get_segment_range(nilfs, segnum, &seg_start,
1079 /* start new extent */
1081 nblocks = seg_end - seg_start + 1;
1085 if (start + nblocks == seg_start) {
1086 /* add to previous extent */
1087 nblocks += seg_end - seg_start + 1;
1091 /* discard previous extent */
1092 if (start < start_block) {
1093 nblocks -= start_block - start;
1094 start = start_block;
1097 if (nblocks >= minlen) {
1098 kunmap_atomic(kaddr);
1100 ret = blkdev_issue_discard(nilfs->ns_bdev,
1101 start * sects_per_block,
1102 nblocks * sects_per_block,
1109 ndiscarded += nblocks;
1110 kaddr = kmap_atomic(su_bh->b_page);
1111 su = nilfs_sufile_block_get_segment_usage(
1112 sufile, segnum, su_bh, kaddr);
1115 /* start new extent */
1117 nblocks = seg_end - seg_start + 1;
1119 kunmap_atomic(kaddr);
1125 /* discard last extent */
1126 if (start < start_block) {
1127 nblocks -= start_block - start;
1128 start = start_block;
1130 if (start + nblocks > end_block + 1)
1131 nblocks = end_block - start + 1;
1133 if (nblocks >= minlen) {
1134 ret = blkdev_issue_discard(nilfs->ns_bdev,
1135 start * sects_per_block,
1136 nblocks * sects_per_block,
1139 ndiscarded += nblocks;
1144 up_read(&NILFS_MDT(sufile)->mi_sem);
1146 range->len = ndiscarded << nilfs->ns_blocksize_bits;
1151 * nilfs_sufile_read - read or get sufile inode
1152 * @sb: super block instance
1153 * @susize: size of a segment usage entry
1154 * @raw_inode: on-disk sufile inode
1155 * @inodep: buffer to store the inode
1157 int nilfs_sufile_read(struct super_block *sb, size_t susize,
1158 struct nilfs_inode *raw_inode, struct inode **inodep)
1160 struct inode *sufile;
1161 struct nilfs_sufile_info *sui;
1162 struct buffer_head *header_bh;
1163 struct nilfs_sufile_header *header;
1167 if (susize > sb->s_blocksize) {
1168 nilfs_err(sb, "too large segment usage size: %zu bytes",
1171 } else if (susize < NILFS_MIN_SEGMENT_USAGE_SIZE) {
1172 nilfs_err(sb, "too small segment usage size: %zu bytes",
1177 sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
1178 if (unlikely(!sufile))
1180 if (!(sufile->i_state & I_NEW))
1183 err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui));
1187 nilfs_mdt_set_entry_size(sufile, susize,
1188 sizeof(struct nilfs_sufile_header));
1190 err = nilfs_read_inode_common(sufile, raw_inode);
1194 err = nilfs_sufile_get_header_block(sufile, &header_bh);
1198 sui = NILFS_SUI(sufile);
1199 kaddr = kmap_atomic(header_bh->b_page);
1200 header = kaddr + bh_offset(header_bh);
1201 sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
1202 kunmap_atomic(kaddr);
1205 sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1;
1208 unlock_new_inode(sufile);
1213 iget_failed(sufile);