1 // SPDX-License-Identifier: GPL-2.0+
3 * 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 if (unlikely(nilfs_segment_usage_error(su)))
475 nilfs_warn(sufile->i_sb, "free segment %llu marked in error",
476 (unsigned long long)segnum);
478 sudirty = nilfs_segment_usage_dirty(su);
479 if (unlikely(!sudirty))
480 nilfs_warn(sufile->i_sb, "free unallocated segment %llu",
481 (unsigned long long)segnum);
483 nilfs_segment_usage_set_clean(su);
484 kunmap_atomic(kaddr);
485 mark_buffer_dirty(su_bh);
487 nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
488 NILFS_SUI(sufile)->ncleansegs++;
490 nilfs_mdt_mark_dirty(sufile);
492 trace_nilfs2_segment_usage_freed(sufile, segnum);
496 * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
497 * @sufile: inode of segment usage file
498 * @segnum: segment number
500 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
502 struct buffer_head *bh;
504 struct nilfs_segment_usage *su;
507 down_write(&NILFS_MDT(sufile)->mi_sem);
508 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
512 kaddr = kmap_atomic(bh->b_page);
513 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
514 if (unlikely(nilfs_segment_usage_error(su))) {
515 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
517 kunmap_atomic(kaddr);
519 if (nilfs_segment_is_active(nilfs, segnum)) {
520 nilfs_error(sufile->i_sb,
521 "active segment %llu is erroneous",
522 (unsigned long long)segnum);
525 * Segments marked erroneous are never allocated by
526 * nilfs_sufile_alloc(); only active segments, ie,
527 * the segments indexed by ns_segnum or ns_nextnum,
528 * can be erroneous here.
534 nilfs_segment_usage_set_dirty(su);
535 kunmap_atomic(kaddr);
536 mark_buffer_dirty(bh);
537 nilfs_mdt_mark_dirty(sufile);
541 up_write(&NILFS_MDT(sufile)->mi_sem);
546 * nilfs_sufile_set_segment_usage - set usage of a segment
547 * @sufile: inode of segment usage file
548 * @segnum: segment number
549 * @nblocks: number of live blocks in the segment
550 * @modtime: modification time (option)
552 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
553 unsigned long nblocks, time64_t modtime)
555 struct buffer_head *bh;
556 struct nilfs_segment_usage *su;
560 down_write(&NILFS_MDT(sufile)->mi_sem);
561 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
565 kaddr = kmap_atomic(bh->b_page);
566 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
569 * Check segusage error and set su_lastmod only when updating
570 * this entry with a valid timestamp, not for cancellation.
572 WARN_ON_ONCE(nilfs_segment_usage_error(su));
573 su->su_lastmod = cpu_to_le64(modtime);
575 su->su_nblocks = cpu_to_le32(nblocks);
576 kunmap_atomic(kaddr);
578 mark_buffer_dirty(bh);
579 nilfs_mdt_mark_dirty(sufile);
583 up_write(&NILFS_MDT(sufile)->mi_sem);
588 * nilfs_sufile_get_stat - get segment usage statistics
589 * @sufile: inode of segment usage file
590 * @sustat: pointer to a structure of segment usage statistics
592 * Description: nilfs_sufile_get_stat() returns information about segment
595 * Return Value: On success, 0 is returned, and segment usage information is
596 * stored in the place pointed by @sustat. On error, one of the following
597 * negative error codes is returned.
601 * %-ENOMEM - Insufficient amount of memory available.
603 int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
605 struct buffer_head *header_bh;
606 struct nilfs_sufile_header *header;
607 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
611 down_read(&NILFS_MDT(sufile)->mi_sem);
613 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
617 kaddr = kmap_atomic(header_bh->b_page);
618 header = kaddr + bh_offset(header_bh);
619 sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
620 sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
621 sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
622 sustat->ss_ctime = nilfs->ns_ctime;
623 sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime;
624 spin_lock(&nilfs->ns_last_segment_lock);
625 sustat->ss_prot_seq = nilfs->ns_prot_seq;
626 spin_unlock(&nilfs->ns_last_segment_lock);
627 kunmap_atomic(kaddr);
631 up_read(&NILFS_MDT(sufile)->mi_sem);
635 void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
636 struct buffer_head *header_bh,
637 struct buffer_head *su_bh)
639 struct nilfs_segment_usage *su;
643 kaddr = kmap_atomic(su_bh->b_page);
644 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
645 if (nilfs_segment_usage_error(su)) {
646 kunmap_atomic(kaddr);
649 suclean = nilfs_segment_usage_clean(su);
650 nilfs_segment_usage_set_error(su);
651 kunmap_atomic(kaddr);
654 nilfs_sufile_mod_counter(header_bh, -1, 0);
655 NILFS_SUI(sufile)->ncleansegs--;
657 mark_buffer_dirty(su_bh);
658 nilfs_mdt_mark_dirty(sufile);
662 * nilfs_sufile_truncate_range - truncate range of segment array
663 * @sufile: inode of segment usage file
664 * @start: start segment number (inclusive)
665 * @end: end segment number (inclusive)
667 * Return Value: On success, 0 is returned. On error, one of the
668 * following negative error codes is returned.
672 * %-ENOMEM - Insufficient amount of memory available.
674 * %-EINVAL - Invalid number of segments specified
676 * %-EBUSY - Dirty or active segments are present in the range
678 static int nilfs_sufile_truncate_range(struct inode *sufile,
679 __u64 start, __u64 end)
681 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
682 struct buffer_head *header_bh;
683 struct buffer_head *su_bh;
684 struct nilfs_segment_usage *su, *su2;
685 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
686 unsigned long segusages_per_block;
687 unsigned long nsegs, ncleaned;
694 nsegs = nilfs_sufile_get_nsegments(sufile);
697 if (start > end || start >= nsegs)
700 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
704 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
707 for (segnum = start; segnum <= end; segnum += n) {
708 n = min_t(unsigned long,
709 segusages_per_block -
710 nilfs_sufile_get_offset(sufile, segnum),
712 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
720 kaddr = kmap_atomic(su_bh->b_page);
721 su = nilfs_sufile_block_get_segment_usage(
722 sufile, segnum, su_bh, kaddr);
724 for (j = 0; j < n; j++, su = (void *)su + susz) {
725 if ((le32_to_cpu(su->su_flags) &
726 ~BIT(NILFS_SEGMENT_USAGE_ERROR)) ||
727 nilfs_segment_is_active(nilfs, segnum + j)) {
729 kunmap_atomic(kaddr);
735 for (su = su2, j = 0; j < n; j++, su = (void *)su + susz) {
736 if (nilfs_segment_usage_error(su)) {
737 nilfs_segment_usage_set_clean(su);
741 kunmap_atomic(kaddr);
743 mark_buffer_dirty(su_bh);
748 if (n == segusages_per_block) {
750 nilfs_sufile_delete_segment_usage_block(sufile, segnum);
757 NILFS_SUI(sufile)->ncleansegs += ncleaned;
758 nilfs_sufile_mod_counter(header_bh, ncleaned, 0);
759 nilfs_mdt_mark_dirty(sufile);
767 * nilfs_sufile_resize - resize segment array
768 * @sufile: inode of segment usage file
769 * @newnsegs: new number of segments
771 * Return Value: On success, 0 is returned. On error, one of the
772 * following negative error codes is returned.
776 * %-ENOMEM - Insufficient amount of memory available.
778 * %-ENOSPC - Enough free space is not left for shrinking
780 * %-EBUSY - Dirty or active segments exist in the region to be truncated
782 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs)
784 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
785 struct buffer_head *header_bh;
786 struct nilfs_sufile_header *header;
787 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
789 unsigned long nsegs, nrsvsegs;
792 down_write(&NILFS_MDT(sufile)->mi_sem);
794 nsegs = nilfs_sufile_get_nsegments(sufile);
795 if (nsegs == newnsegs)
799 nrsvsegs = nilfs_nrsvsegs(nilfs, newnsegs);
800 if (newnsegs < nsegs && nsegs - newnsegs + nrsvsegs > sui->ncleansegs)
803 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
807 if (newnsegs > nsegs) {
808 sui->ncleansegs += newnsegs - nsegs;
809 } else /* newnsegs < nsegs */ {
810 ret = nilfs_sufile_truncate_range(sufile, newnsegs, nsegs - 1);
814 sui->ncleansegs -= nsegs - newnsegs;
817 * If the sufile is successfully truncated, immediately adjust
818 * the segment allocation space while locking the semaphore
819 * "mi_sem" so that nilfs_sufile_alloc() never allocates
820 * segments in the truncated space.
822 sui->allocmax = newnsegs - 1;
826 kaddr = kmap_atomic(header_bh->b_page);
827 header = kaddr + bh_offset(header_bh);
828 header->sh_ncleansegs = cpu_to_le64(sui->ncleansegs);
829 kunmap_atomic(kaddr);
831 mark_buffer_dirty(header_bh);
832 nilfs_mdt_mark_dirty(sufile);
833 nilfs_set_nsegments(nilfs, newnsegs);
838 up_write(&NILFS_MDT(sufile)->mi_sem);
843 * nilfs_sufile_get_suinfo -
844 * @sufile: inode of segment usage file
845 * @segnum: segment number to start looking
846 * @buf: array of suinfo
847 * @sisz: byte size of suinfo
848 * @nsi: size of suinfo array
852 * Return Value: On success, 0 is returned and .... On error, one of the
853 * following negative error codes is returned.
857 * %-ENOMEM - Insufficient amount of memory available.
859 ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
860 unsigned int sisz, size_t nsi)
862 struct buffer_head *su_bh;
863 struct nilfs_segment_usage *su;
864 struct nilfs_suinfo *si = buf;
865 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
866 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
868 unsigned long nsegs, segusages_per_block;
872 down_read(&NILFS_MDT(sufile)->mi_sem);
874 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
875 nsegs = min_t(unsigned long,
876 nilfs_sufile_get_nsegments(sufile) - segnum,
878 for (i = 0; i < nsegs; i += n, segnum += n) {
879 n = min_t(unsigned long,
880 segusages_per_block -
881 nilfs_sufile_get_offset(sufile, segnum),
883 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
889 memset(si, 0, sisz * n);
890 si = (void *)si + sisz * n;
894 kaddr = kmap_atomic(su_bh->b_page);
895 su = nilfs_sufile_block_get_segment_usage(
896 sufile, segnum, su_bh, kaddr);
898 j++, su = (void *)su + susz, si = (void *)si + sisz) {
899 si->sui_lastmod = le64_to_cpu(su->su_lastmod);
900 si->sui_nblocks = le32_to_cpu(su->su_nblocks);
901 si->sui_flags = le32_to_cpu(su->su_flags) &
902 ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
903 if (nilfs_segment_is_active(nilfs, segnum + j))
905 BIT(NILFS_SEGMENT_USAGE_ACTIVE);
907 kunmap_atomic(kaddr);
913 up_read(&NILFS_MDT(sufile)->mi_sem);
918 * nilfs_sufile_set_suinfo - sets segment usage info
919 * @sufile: inode of segment usage file
920 * @buf: array of suinfo_update
921 * @supsz: byte size of suinfo_update
922 * @nsup: size of suinfo_update array
924 * Description: Takes an array of nilfs_suinfo_update structs and updates
925 * segment usage accordingly. Only the fields indicated by the sup_flags
928 * Return Value: On success, 0 is returned. On error, one of the
929 * following negative error codes is returned.
933 * %-ENOMEM - Insufficient amount of memory available.
935 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
937 ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
938 unsigned int supsz, size_t nsup)
940 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
941 struct buffer_head *header_bh, *bh;
942 struct nilfs_suinfo_update *sup, *supend = buf + supsz * nsup;
943 struct nilfs_segment_usage *su;
945 unsigned long blkoff, prev_blkoff;
946 int cleansi, cleansu, dirtysi, dirtysu;
947 long ncleaned = 0, ndirtied = 0;
950 if (unlikely(nsup == 0))
953 for (sup = buf; sup < supend; sup = (void *)sup + supsz) {
954 if (sup->sup_segnum >= nilfs->ns_nsegments
956 (~0UL << __NR_NILFS_SUINFO_UPDATE_FIELDS))
957 || (nilfs_suinfo_update_nblocks(sup) &&
958 sup->sup_sui.sui_nblocks >
959 nilfs->ns_blocks_per_segment))
963 down_write(&NILFS_MDT(sufile)->mi_sem);
965 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
970 blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
971 ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
976 kaddr = kmap_atomic(bh->b_page);
977 su = nilfs_sufile_block_get_segment_usage(
978 sufile, sup->sup_segnum, bh, kaddr);
980 if (nilfs_suinfo_update_lastmod(sup))
981 su->su_lastmod = cpu_to_le64(sup->sup_sui.sui_lastmod);
983 if (nilfs_suinfo_update_nblocks(sup))
984 su->su_nblocks = cpu_to_le32(sup->sup_sui.sui_nblocks);
986 if (nilfs_suinfo_update_flags(sup)) {
988 * Active flag is a virtual flag projected by running
989 * nilfs kernel code - drop it not to write it to
992 sup->sup_sui.sui_flags &=
993 ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
995 cleansi = nilfs_suinfo_clean(&sup->sup_sui);
996 cleansu = nilfs_segment_usage_clean(su);
997 dirtysi = nilfs_suinfo_dirty(&sup->sup_sui);
998 dirtysu = nilfs_segment_usage_dirty(su);
1000 if (cleansi && !cleansu)
1002 else if (!cleansi && cleansu)
1005 if (dirtysi && !dirtysu)
1007 else if (!dirtysi && dirtysu)
1010 su->su_flags = cpu_to_le32(sup->sup_sui.sui_flags);
1013 kunmap_atomic(kaddr);
1015 sup = (void *)sup + supsz;
1019 prev_blkoff = blkoff;
1020 blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
1021 if (blkoff == prev_blkoff)
1024 /* get different block */
1025 mark_buffer_dirty(bh);
1027 ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
1028 if (unlikely(ret < 0))
1031 mark_buffer_dirty(bh);
1035 if (ncleaned || ndirtied) {
1036 nilfs_sufile_mod_counter(header_bh, (u64)ncleaned,
1038 NILFS_SUI(sufile)->ncleansegs += ncleaned;
1040 nilfs_mdt_mark_dirty(sufile);
1044 up_write(&NILFS_MDT(sufile)->mi_sem);
1049 * nilfs_sufile_trim_fs() - trim ioctl handle function
1050 * @sufile: inode of segment usage file
1051 * @range: fstrim_range structure
1053 * start: First Byte to trim
1054 * len: number of Bytes to trim from start
1055 * minlen: minimum extent length in Bytes
1057 * Decription: nilfs_sufile_trim_fs goes through all segments containing bytes
1058 * from start to start+len. start is rounded up to the next block boundary
1059 * and start+len is rounded down. For each clean segment blkdev_issue_discard
1060 * function is invoked.
1062 * Return Value: On success, 0 is returned or negative error code, otherwise.
1064 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range)
1066 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
1067 struct buffer_head *su_bh;
1068 struct nilfs_segment_usage *su;
1070 size_t n, i, susz = NILFS_MDT(sufile)->mi_entry_size;
1071 sector_t seg_start, seg_end, start_block, end_block;
1072 sector_t start = 0, nblocks = 0;
1073 u64 segnum, segnum_end, minlen, len, max_blocks, ndiscarded = 0;
1075 unsigned int sects_per_block;
1077 sects_per_block = (1 << nilfs->ns_blocksize_bits) /
1078 bdev_logical_block_size(nilfs->ns_bdev);
1079 len = range->len >> nilfs->ns_blocksize_bits;
1080 minlen = range->minlen >> nilfs->ns_blocksize_bits;
1081 max_blocks = ((u64)nilfs->ns_nsegments * nilfs->ns_blocks_per_segment);
1083 if (!len || range->start >= max_blocks << nilfs->ns_blocksize_bits)
1086 start_block = (range->start + nilfs->ns_blocksize - 1) >>
1087 nilfs->ns_blocksize_bits;
1090 * range->len can be very large (actually, it is set to
1091 * ULLONG_MAX by default) - truncate upper end of the range
1092 * carefully so as not to overflow.
1094 if (max_blocks - start_block < len)
1095 end_block = max_blocks - 1;
1097 end_block = start_block + len - 1;
1099 segnum = nilfs_get_segnum_of_block(nilfs, start_block);
1100 segnum_end = nilfs_get_segnum_of_block(nilfs, end_block);
1102 down_read(&NILFS_MDT(sufile)->mi_sem);
1104 while (segnum <= segnum_end) {
1105 n = nilfs_sufile_segment_usages_in_block(sufile, segnum,
1108 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
1118 kaddr = kmap_atomic(su_bh->b_page);
1119 su = nilfs_sufile_block_get_segment_usage(sufile, segnum,
1121 for (i = 0; i < n; ++i, ++segnum, su = (void *)su + susz) {
1122 if (!nilfs_segment_usage_clean(su))
1125 nilfs_get_segment_range(nilfs, segnum, &seg_start,
1129 /* start new extent */
1131 nblocks = seg_end - seg_start + 1;
1135 if (start + nblocks == seg_start) {
1136 /* add to previous extent */
1137 nblocks += seg_end - seg_start + 1;
1141 /* discard previous extent */
1142 if (start < start_block) {
1143 nblocks -= start_block - start;
1144 start = start_block;
1147 if (nblocks >= minlen) {
1148 kunmap_atomic(kaddr);
1150 ret = blkdev_issue_discard(nilfs->ns_bdev,
1151 start * sects_per_block,
1152 nblocks * sects_per_block,
1159 ndiscarded += nblocks;
1160 kaddr = kmap_atomic(su_bh->b_page);
1161 su = nilfs_sufile_block_get_segment_usage(
1162 sufile, segnum, su_bh, kaddr);
1165 /* start new extent */
1167 nblocks = seg_end - seg_start + 1;
1169 kunmap_atomic(kaddr);
1175 /* discard last extent */
1176 if (start < start_block) {
1177 nblocks -= start_block - start;
1178 start = start_block;
1180 if (start + nblocks > end_block + 1)
1181 nblocks = end_block - start + 1;
1183 if (nblocks >= minlen) {
1184 ret = blkdev_issue_discard(nilfs->ns_bdev,
1185 start * sects_per_block,
1186 nblocks * sects_per_block,
1189 ndiscarded += nblocks;
1194 up_read(&NILFS_MDT(sufile)->mi_sem);
1196 range->len = ndiscarded << nilfs->ns_blocksize_bits;
1201 * nilfs_sufile_read - read or get sufile inode
1202 * @sb: super block instance
1203 * @susize: size of a segment usage entry
1204 * @raw_inode: on-disk sufile inode
1205 * @inodep: buffer to store the inode
1207 int nilfs_sufile_read(struct super_block *sb, size_t susize,
1208 struct nilfs_inode *raw_inode, struct inode **inodep)
1210 struct inode *sufile;
1211 struct nilfs_sufile_info *sui;
1212 struct buffer_head *header_bh;
1213 struct nilfs_sufile_header *header;
1217 if (susize > sb->s_blocksize) {
1218 nilfs_err(sb, "too large segment usage size: %zu bytes",
1221 } else if (susize < NILFS_MIN_SEGMENT_USAGE_SIZE) {
1222 nilfs_err(sb, "too small segment usage size: %zu bytes",
1227 sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
1228 if (unlikely(!sufile))
1230 if (!(sufile->i_state & I_NEW))
1233 err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui));
1237 nilfs_mdt_set_entry_size(sufile, susize,
1238 sizeof(struct nilfs_sufile_header));
1240 err = nilfs_read_inode_common(sufile, raw_inode);
1244 err = nilfs_sufile_get_header_block(sufile, &header_bh);
1248 sui = NILFS_SUI(sufile);
1249 kaddr = kmap_atomic(header_bh->b_page);
1250 header = kaddr + bh_offset(header_bh);
1251 sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
1252 kunmap_atomic(kaddr);
1255 sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1;
1258 unlock_new_inode(sufile);
1263 iget_failed(sufile);