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_msg(sufile->i_sb, KERN_WARNING,
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_msg(sufile->i_sb, KERN_WARNING,
234 "%s: invalid segment number: %llu",
235 __func__, (unsigned long long)segnum);
238 down_write(&NILFS_MDT(sufile)->mi_sem);
240 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
244 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh);
246 dofunc(sufile, segnum, header_bh, bh);
252 up_write(&NILFS_MDT(sufile)->mi_sem);
257 * nilfs_sufile_set_alloc_range - limit range of segment to be allocated
258 * @sufile: inode of segment usage file
259 * @start: minimum segment number of allocatable region (inclusive)
260 * @end: maximum segment number of allocatable region (inclusive)
262 * Return Value: On success, 0 is returned. On error, one of the
263 * following negative error codes is returned.
265 * %-ERANGE - invalid segment region
267 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end)
269 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
273 down_write(&NILFS_MDT(sufile)->mi_sem);
274 nsegs = nilfs_sufile_get_nsegments(sufile);
276 if (start <= end && end < nsegs) {
277 sui->allocmin = start;
281 up_write(&NILFS_MDT(sufile)->mi_sem);
286 * nilfs_sufile_alloc - allocate a segment
287 * @sufile: inode of segment usage file
288 * @segnump: pointer to segment number
290 * Description: nilfs_sufile_alloc() allocates a clean segment.
292 * Return Value: On success, 0 is returned and the segment number of the
293 * allocated segment is stored in the place pointed by @segnump. On error, one
294 * of the following negative error codes is returned.
298 * %-ENOMEM - Insufficient amount of memory available.
300 * %-ENOSPC - No clean segment left.
302 int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
304 struct buffer_head *header_bh, *su_bh;
305 struct nilfs_sufile_header *header;
306 struct nilfs_segment_usage *su;
307 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
308 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
309 __u64 segnum, maxsegnum, last_alloc;
311 unsigned long nsegments, nsus, cnt;
314 down_write(&NILFS_MDT(sufile)->mi_sem);
316 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
319 kaddr = kmap_atomic(header_bh->b_page);
320 header = kaddr + bh_offset(header_bh);
321 last_alloc = le64_to_cpu(header->sh_last_alloc);
322 kunmap_atomic(kaddr);
324 nsegments = nilfs_sufile_get_nsegments(sufile);
325 maxsegnum = sui->allocmax;
326 segnum = last_alloc + 1;
327 if (segnum < sui->allocmin || segnum > sui->allocmax)
328 segnum = sui->allocmin;
330 for (cnt = 0; cnt < nsegments; cnt += nsus) {
331 if (segnum > maxsegnum) {
332 if (cnt < sui->allocmax - sui->allocmin + 1) {
334 * wrap around in the limited region.
335 * if allocation started from
336 * sui->allocmin, this never happens.
338 segnum = sui->allocmin;
339 maxsegnum = last_alloc;
340 } else if (segnum > sui->allocmin &&
341 sui->allocmax + 1 < nsegments) {
342 segnum = sui->allocmax + 1;
343 maxsegnum = nsegments - 1;
344 } else if (sui->allocmin > 0) {
346 maxsegnum = sui->allocmin - 1;
348 break; /* never happens */
351 trace_nilfs2_segment_usage_check(sufile, segnum, cnt);
352 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1,
356 kaddr = kmap_atomic(su_bh->b_page);
357 su = nilfs_sufile_block_get_segment_usage(
358 sufile, segnum, su_bh, kaddr);
360 nsus = nilfs_sufile_segment_usages_in_block(
361 sufile, segnum, maxsegnum);
362 for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) {
363 if (!nilfs_segment_usage_clean(su))
365 /* found a clean segment */
366 nilfs_segment_usage_set_dirty(su);
367 kunmap_atomic(kaddr);
369 kaddr = kmap_atomic(header_bh->b_page);
370 header = kaddr + bh_offset(header_bh);
371 le64_add_cpu(&header->sh_ncleansegs, -1);
372 le64_add_cpu(&header->sh_ndirtysegs, 1);
373 header->sh_last_alloc = cpu_to_le64(segnum);
374 kunmap_atomic(kaddr);
377 mark_buffer_dirty(header_bh);
378 mark_buffer_dirty(su_bh);
379 nilfs_mdt_mark_dirty(sufile);
383 trace_nilfs2_segment_usage_allocated(sufile, segnum);
388 kunmap_atomic(kaddr);
392 /* no segments left */
399 up_write(&NILFS_MDT(sufile)->mi_sem);
403 void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
404 struct buffer_head *header_bh,
405 struct buffer_head *su_bh)
407 struct nilfs_segment_usage *su;
410 kaddr = kmap_atomic(su_bh->b_page);
411 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
412 if (unlikely(!nilfs_segment_usage_clean(su))) {
413 nilfs_msg(sufile->i_sb, KERN_WARNING,
414 "%s: segment %llu must be clean", __func__,
415 (unsigned long long)segnum);
416 kunmap_atomic(kaddr);
419 nilfs_segment_usage_set_dirty(su);
420 kunmap_atomic(kaddr);
422 nilfs_sufile_mod_counter(header_bh, -1, 1);
423 NILFS_SUI(sufile)->ncleansegs--;
425 mark_buffer_dirty(su_bh);
426 nilfs_mdt_mark_dirty(sufile);
429 void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
430 struct buffer_head *header_bh,
431 struct buffer_head *su_bh)
433 struct nilfs_segment_usage *su;
437 kaddr = kmap_atomic(su_bh->b_page);
438 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
439 if (su->su_flags == cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY)) &&
440 su->su_nblocks == cpu_to_le32(0)) {
441 kunmap_atomic(kaddr);
444 clean = nilfs_segment_usage_clean(su);
445 dirty = nilfs_segment_usage_dirty(su);
447 /* make the segment garbage */
448 su->su_lastmod = cpu_to_le64(0);
449 su->su_nblocks = cpu_to_le32(0);
450 su->su_flags = cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY));
451 kunmap_atomic(kaddr);
453 nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
454 NILFS_SUI(sufile)->ncleansegs -= clean;
456 mark_buffer_dirty(su_bh);
457 nilfs_mdt_mark_dirty(sufile);
460 void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
461 struct buffer_head *header_bh,
462 struct buffer_head *su_bh)
464 struct nilfs_segment_usage *su;
468 kaddr = kmap_atomic(su_bh->b_page);
469 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
470 if (nilfs_segment_usage_clean(su)) {
471 nilfs_msg(sufile->i_sb, KERN_WARNING,
472 "%s: segment %llu is already clean",
473 __func__, (unsigned long long)segnum);
474 kunmap_atomic(kaddr);
477 WARN_ON(nilfs_segment_usage_error(su));
478 WARN_ON(!nilfs_segment_usage_dirty(su));
480 sudirty = nilfs_segment_usage_dirty(su);
481 nilfs_segment_usage_set_clean(su);
482 kunmap_atomic(kaddr);
483 mark_buffer_dirty(su_bh);
485 nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
486 NILFS_SUI(sufile)->ncleansegs++;
488 nilfs_mdt_mark_dirty(sufile);
490 trace_nilfs2_segment_usage_freed(sufile, segnum);
494 * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
495 * @sufile: inode of segment usage file
496 * @segnum: segment number
498 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
500 struct buffer_head *bh;
502 struct nilfs_segment_usage *su;
505 down_write(&NILFS_MDT(sufile)->mi_sem);
506 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
508 mark_buffer_dirty(bh);
509 nilfs_mdt_mark_dirty(sufile);
510 kaddr = kmap_atomic(bh->b_page);
511 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
512 nilfs_segment_usage_set_dirty(su);
513 kunmap_atomic(kaddr);
516 up_write(&NILFS_MDT(sufile)->mi_sem);
521 * nilfs_sufile_set_segment_usage - set usage of a segment
522 * @sufile: inode of segment usage file
523 * @segnum: segment number
524 * @nblocks: number of live blocks in the segment
525 * @modtime: modification time (option)
527 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
528 unsigned long nblocks, time64_t modtime)
530 struct buffer_head *bh;
531 struct nilfs_segment_usage *su;
535 down_write(&NILFS_MDT(sufile)->mi_sem);
536 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
540 kaddr = kmap_atomic(bh->b_page);
541 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
542 WARN_ON(nilfs_segment_usage_error(su));
544 su->su_lastmod = cpu_to_le64(modtime);
545 su->su_nblocks = cpu_to_le32(nblocks);
546 kunmap_atomic(kaddr);
548 mark_buffer_dirty(bh);
549 nilfs_mdt_mark_dirty(sufile);
553 up_write(&NILFS_MDT(sufile)->mi_sem);
558 * nilfs_sufile_get_stat - get segment usage statistics
559 * @sufile: inode of segment usage file
560 * @stat: pointer to a structure of segment usage statistics
562 * Description: nilfs_sufile_get_stat() returns information about segment
565 * Return Value: On success, 0 is returned, and segment usage information is
566 * stored in the place pointed by @stat. On error, one of the following
567 * negative error codes is returned.
571 * %-ENOMEM - Insufficient amount of memory available.
573 int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
575 struct buffer_head *header_bh;
576 struct nilfs_sufile_header *header;
577 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
581 down_read(&NILFS_MDT(sufile)->mi_sem);
583 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
587 kaddr = kmap_atomic(header_bh->b_page);
588 header = kaddr + bh_offset(header_bh);
589 sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
590 sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
591 sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
592 sustat->ss_ctime = nilfs->ns_ctime;
593 sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime;
594 spin_lock(&nilfs->ns_last_segment_lock);
595 sustat->ss_prot_seq = nilfs->ns_prot_seq;
596 spin_unlock(&nilfs->ns_last_segment_lock);
597 kunmap_atomic(kaddr);
601 up_read(&NILFS_MDT(sufile)->mi_sem);
605 void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
606 struct buffer_head *header_bh,
607 struct buffer_head *su_bh)
609 struct nilfs_segment_usage *su;
613 kaddr = kmap_atomic(su_bh->b_page);
614 su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
615 if (nilfs_segment_usage_error(su)) {
616 kunmap_atomic(kaddr);
619 suclean = nilfs_segment_usage_clean(su);
620 nilfs_segment_usage_set_error(su);
621 kunmap_atomic(kaddr);
624 nilfs_sufile_mod_counter(header_bh, -1, 0);
625 NILFS_SUI(sufile)->ncleansegs--;
627 mark_buffer_dirty(su_bh);
628 nilfs_mdt_mark_dirty(sufile);
632 * nilfs_sufile_truncate_range - truncate range of segment array
633 * @sufile: inode of segment usage file
634 * @start: start segment number (inclusive)
635 * @end: end segment number (inclusive)
637 * Return Value: On success, 0 is returned. On error, one of the
638 * following negative error codes is returned.
642 * %-ENOMEM - Insufficient amount of memory available.
644 * %-EINVAL - Invalid number of segments specified
646 * %-EBUSY - Dirty or active segments are present in the range
648 static int nilfs_sufile_truncate_range(struct inode *sufile,
649 __u64 start, __u64 end)
651 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
652 struct buffer_head *header_bh;
653 struct buffer_head *su_bh;
654 struct nilfs_segment_usage *su, *su2;
655 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
656 unsigned long segusages_per_block;
657 unsigned long nsegs, ncleaned;
664 nsegs = nilfs_sufile_get_nsegments(sufile);
667 if (start > end || start >= nsegs)
670 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
674 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
677 for (segnum = start; segnum <= end; segnum += n) {
678 n = min_t(unsigned long,
679 segusages_per_block -
680 nilfs_sufile_get_offset(sufile, segnum),
682 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
690 kaddr = kmap_atomic(su_bh->b_page);
691 su = nilfs_sufile_block_get_segment_usage(
692 sufile, segnum, su_bh, kaddr);
694 for (j = 0; j < n; j++, su = (void *)su + susz) {
695 if ((le32_to_cpu(su->su_flags) &
696 ~BIT(NILFS_SEGMENT_USAGE_ERROR)) ||
697 nilfs_segment_is_active(nilfs, segnum + j)) {
699 kunmap_atomic(kaddr);
705 for (su = su2, j = 0; j < n; j++, su = (void *)su + susz) {
706 if (nilfs_segment_usage_error(su)) {
707 nilfs_segment_usage_set_clean(su);
711 kunmap_atomic(kaddr);
713 mark_buffer_dirty(su_bh);
718 if (n == segusages_per_block) {
720 nilfs_sufile_delete_segment_usage_block(sufile, segnum);
727 NILFS_SUI(sufile)->ncleansegs += ncleaned;
728 nilfs_sufile_mod_counter(header_bh, ncleaned, 0);
729 nilfs_mdt_mark_dirty(sufile);
737 * nilfs_sufile_resize - resize segment array
738 * @sufile: inode of segment usage file
739 * @newnsegs: new number of segments
741 * Return Value: On success, 0 is returned. On error, one of the
742 * following negative error codes is returned.
746 * %-ENOMEM - Insufficient amount of memory available.
748 * %-ENOSPC - Enough free space is not left for shrinking
750 * %-EBUSY - Dirty or active segments exist in the region to be truncated
752 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs)
754 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
755 struct buffer_head *header_bh;
756 struct nilfs_sufile_header *header;
757 struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
759 unsigned long nsegs, nrsvsegs;
762 down_write(&NILFS_MDT(sufile)->mi_sem);
764 nsegs = nilfs_sufile_get_nsegments(sufile);
765 if (nsegs == newnsegs)
769 nrsvsegs = nilfs_nrsvsegs(nilfs, newnsegs);
770 if (newnsegs < nsegs && nsegs - newnsegs + nrsvsegs > sui->ncleansegs)
773 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
777 if (newnsegs > nsegs) {
778 sui->ncleansegs += newnsegs - nsegs;
779 } else /* newnsegs < nsegs */ {
780 ret = nilfs_sufile_truncate_range(sufile, newnsegs, nsegs - 1);
784 sui->ncleansegs -= nsegs - newnsegs;
787 * If the sufile is successfully truncated, immediately adjust
788 * the segment allocation space while locking the semaphore
789 * "mi_sem" so that nilfs_sufile_alloc() never allocates
790 * segments in the truncated space.
792 sui->allocmax = newnsegs - 1;
796 kaddr = kmap_atomic(header_bh->b_page);
797 header = kaddr + bh_offset(header_bh);
798 header->sh_ncleansegs = cpu_to_le64(sui->ncleansegs);
799 kunmap_atomic(kaddr);
801 mark_buffer_dirty(header_bh);
802 nilfs_mdt_mark_dirty(sufile);
803 nilfs_set_nsegments(nilfs, newnsegs);
808 up_write(&NILFS_MDT(sufile)->mi_sem);
813 * nilfs_sufile_get_suinfo -
814 * @sufile: inode of segment usage file
815 * @segnum: segment number to start looking
816 * @buf: array of suinfo
817 * @sisz: byte size of suinfo
818 * @nsi: size of suinfo array
822 * Return Value: On success, 0 is returned and .... On error, one of the
823 * following negative error codes is returned.
827 * %-ENOMEM - Insufficient amount of memory available.
829 ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
830 unsigned int sisz, size_t nsi)
832 struct buffer_head *su_bh;
833 struct nilfs_segment_usage *su;
834 struct nilfs_suinfo *si = buf;
835 size_t susz = NILFS_MDT(sufile)->mi_entry_size;
836 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
838 unsigned long nsegs, segusages_per_block;
842 down_read(&NILFS_MDT(sufile)->mi_sem);
844 segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
845 nsegs = min_t(unsigned long,
846 nilfs_sufile_get_nsegments(sufile) - segnum,
848 for (i = 0; i < nsegs; i += n, segnum += n) {
849 n = min_t(unsigned long,
850 segusages_per_block -
851 nilfs_sufile_get_offset(sufile, segnum),
853 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
859 memset(si, 0, sisz * n);
860 si = (void *)si + sisz * n;
864 kaddr = kmap_atomic(su_bh->b_page);
865 su = nilfs_sufile_block_get_segment_usage(
866 sufile, segnum, su_bh, kaddr);
868 j++, su = (void *)su + susz, si = (void *)si + sisz) {
869 si->sui_lastmod = le64_to_cpu(su->su_lastmod);
870 si->sui_nblocks = le32_to_cpu(su->su_nblocks);
871 si->sui_flags = le32_to_cpu(su->su_flags) &
872 ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
873 if (nilfs_segment_is_active(nilfs, segnum + j))
875 BIT(NILFS_SEGMENT_USAGE_ACTIVE);
877 kunmap_atomic(kaddr);
883 up_read(&NILFS_MDT(sufile)->mi_sem);
888 * nilfs_sufile_set_suinfo - sets segment usage info
889 * @sufile: inode of segment usage file
890 * @buf: array of suinfo_update
891 * @supsz: byte size of suinfo_update
892 * @nsup: size of suinfo_update array
894 * Description: Takes an array of nilfs_suinfo_update structs and updates
895 * segment usage accordingly. Only the fields indicated by the sup_flags
898 * Return Value: On success, 0 is returned. On error, one of the
899 * following negative error codes is returned.
903 * %-ENOMEM - Insufficient amount of memory available.
905 * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
907 ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
908 unsigned int supsz, size_t nsup)
910 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
911 struct buffer_head *header_bh, *bh;
912 struct nilfs_suinfo_update *sup, *supend = buf + supsz * nsup;
913 struct nilfs_segment_usage *su;
915 unsigned long blkoff, prev_blkoff;
916 int cleansi, cleansu, dirtysi, dirtysu;
917 long ncleaned = 0, ndirtied = 0;
920 if (unlikely(nsup == 0))
923 for (sup = buf; sup < supend; sup = (void *)sup + supsz) {
924 if (sup->sup_segnum >= nilfs->ns_nsegments
926 (~0UL << __NR_NILFS_SUINFO_UPDATE_FIELDS))
927 || (nilfs_suinfo_update_nblocks(sup) &&
928 sup->sup_sui.sui_nblocks >
929 nilfs->ns_blocks_per_segment))
933 down_write(&NILFS_MDT(sufile)->mi_sem);
935 ret = nilfs_sufile_get_header_block(sufile, &header_bh);
940 blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
941 ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
946 kaddr = kmap_atomic(bh->b_page);
947 su = nilfs_sufile_block_get_segment_usage(
948 sufile, sup->sup_segnum, bh, kaddr);
950 if (nilfs_suinfo_update_lastmod(sup))
951 su->su_lastmod = cpu_to_le64(sup->sup_sui.sui_lastmod);
953 if (nilfs_suinfo_update_nblocks(sup))
954 su->su_nblocks = cpu_to_le32(sup->sup_sui.sui_nblocks);
956 if (nilfs_suinfo_update_flags(sup)) {
958 * Active flag is a virtual flag projected by running
959 * nilfs kernel code - drop it not to write it to
962 sup->sup_sui.sui_flags &=
963 ~BIT(NILFS_SEGMENT_USAGE_ACTIVE);
965 cleansi = nilfs_suinfo_clean(&sup->sup_sui);
966 cleansu = nilfs_segment_usage_clean(su);
967 dirtysi = nilfs_suinfo_dirty(&sup->sup_sui);
968 dirtysu = nilfs_segment_usage_dirty(su);
970 if (cleansi && !cleansu)
972 else if (!cleansi && cleansu)
975 if (dirtysi && !dirtysu)
977 else if (!dirtysi && dirtysu)
980 su->su_flags = cpu_to_le32(sup->sup_sui.sui_flags);
983 kunmap_atomic(kaddr);
985 sup = (void *)sup + supsz;
989 prev_blkoff = blkoff;
990 blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
991 if (blkoff == prev_blkoff)
994 /* get different block */
995 mark_buffer_dirty(bh);
997 ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
998 if (unlikely(ret < 0))
1001 mark_buffer_dirty(bh);
1005 if (ncleaned || ndirtied) {
1006 nilfs_sufile_mod_counter(header_bh, (u64)ncleaned,
1008 NILFS_SUI(sufile)->ncleansegs += ncleaned;
1010 nilfs_mdt_mark_dirty(sufile);
1014 up_write(&NILFS_MDT(sufile)->mi_sem);
1019 * nilfs_sufile_trim_fs() - trim ioctl handle function
1020 * @sufile: inode of segment usage file
1021 * @range: fstrim_range structure
1023 * start: First Byte to trim
1024 * len: number of Bytes to trim from start
1025 * minlen: minimum extent length in Bytes
1027 * Decription: nilfs_sufile_trim_fs goes through all segments containing bytes
1028 * from start to start+len. start is rounded up to the next block boundary
1029 * and start+len is rounded down. For each clean segment blkdev_issue_discard
1030 * function is invoked.
1032 * Return Value: On success, 0 is returned or negative error code, otherwise.
1034 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range)
1036 struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
1037 struct buffer_head *su_bh;
1038 struct nilfs_segment_usage *su;
1040 size_t n, i, susz = NILFS_MDT(sufile)->mi_entry_size;
1041 sector_t seg_start, seg_end, start_block, end_block;
1042 sector_t start = 0, nblocks = 0;
1043 u64 segnum, segnum_end, minlen, len, max_blocks, ndiscarded = 0;
1045 unsigned int sects_per_block;
1047 sects_per_block = (1 << nilfs->ns_blocksize_bits) /
1048 bdev_logical_block_size(nilfs->ns_bdev);
1049 len = range->len >> nilfs->ns_blocksize_bits;
1050 minlen = range->minlen >> nilfs->ns_blocksize_bits;
1051 max_blocks = ((u64)nilfs->ns_nsegments * nilfs->ns_blocks_per_segment);
1053 if (!len || range->start >= max_blocks << nilfs->ns_blocksize_bits)
1056 start_block = (range->start + nilfs->ns_blocksize - 1) >>
1057 nilfs->ns_blocksize_bits;
1060 * range->len can be very large (actually, it is set to
1061 * ULLONG_MAX by default) - truncate upper end of the range
1062 * carefully so as not to overflow.
1064 if (max_blocks - start_block < len)
1065 end_block = max_blocks - 1;
1067 end_block = start_block + len - 1;
1069 segnum = nilfs_get_segnum_of_block(nilfs, start_block);
1070 segnum_end = nilfs_get_segnum_of_block(nilfs, end_block);
1072 down_read(&NILFS_MDT(sufile)->mi_sem);
1074 while (segnum <= segnum_end) {
1075 n = nilfs_sufile_segment_usages_in_block(sufile, segnum,
1078 ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0,
1088 kaddr = kmap_atomic(su_bh->b_page);
1089 su = nilfs_sufile_block_get_segment_usage(sufile, segnum,
1091 for (i = 0; i < n; ++i, ++segnum, su = (void *)su + susz) {
1092 if (!nilfs_segment_usage_clean(su))
1095 nilfs_get_segment_range(nilfs, segnum, &seg_start,
1099 /* start new extent */
1101 nblocks = seg_end - seg_start + 1;
1105 if (start + nblocks == seg_start) {
1106 /* add to previous extent */
1107 nblocks += seg_end - seg_start + 1;
1111 /* discard previous extent */
1112 if (start < start_block) {
1113 nblocks -= start_block - start;
1114 start = start_block;
1117 if (nblocks >= minlen) {
1118 kunmap_atomic(kaddr);
1120 ret = blkdev_issue_discard(nilfs->ns_bdev,
1121 start * sects_per_block,
1122 nblocks * sects_per_block,
1129 ndiscarded += nblocks;
1130 kaddr = kmap_atomic(su_bh->b_page);
1131 su = nilfs_sufile_block_get_segment_usage(
1132 sufile, segnum, su_bh, kaddr);
1135 /* start new extent */
1137 nblocks = seg_end - seg_start + 1;
1139 kunmap_atomic(kaddr);
1145 /* discard last extent */
1146 if (start < start_block) {
1147 nblocks -= start_block - start;
1148 start = start_block;
1150 if (start + nblocks > end_block + 1)
1151 nblocks = end_block - start + 1;
1153 if (nblocks >= minlen) {
1154 ret = blkdev_issue_discard(nilfs->ns_bdev,
1155 start * sects_per_block,
1156 nblocks * sects_per_block,
1159 ndiscarded += nblocks;
1164 up_read(&NILFS_MDT(sufile)->mi_sem);
1166 range->len = ndiscarded << nilfs->ns_blocksize_bits;
1171 * nilfs_sufile_read - read or get sufile inode
1172 * @sb: super block instance
1173 * @susize: size of a segment usage entry
1174 * @raw_inode: on-disk sufile inode
1175 * @inodep: buffer to store the inode
1177 int nilfs_sufile_read(struct super_block *sb, size_t susize,
1178 struct nilfs_inode *raw_inode, struct inode **inodep)
1180 struct inode *sufile;
1181 struct nilfs_sufile_info *sui;
1182 struct buffer_head *header_bh;
1183 struct nilfs_sufile_header *header;
1187 if (susize > sb->s_blocksize) {
1188 nilfs_msg(sb, KERN_ERR,
1189 "too large segment usage size: %zu bytes", susize);
1191 } else if (susize < NILFS_MIN_SEGMENT_USAGE_SIZE) {
1192 nilfs_msg(sb, KERN_ERR,
1193 "too small segment usage size: %zu bytes", susize);
1197 sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
1198 if (unlikely(!sufile))
1200 if (!(sufile->i_state & I_NEW))
1203 err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui));
1207 nilfs_mdt_set_entry_size(sufile, susize,
1208 sizeof(struct nilfs_sufile_header));
1210 err = nilfs_read_inode_common(sufile, raw_inode);
1214 err = nilfs_sufile_get_header_block(sufile, &header_bh);
1218 sui = NILFS_SUI(sufile);
1219 kaddr = kmap_atomic(header_bh->b_page);
1220 header = kaddr + bh_offset(header_bh);
1221 sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
1222 kunmap_atomic(kaddr);
1225 sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1;
1228 unlock_new_inode(sufile);
1233 iget_failed(sufile);