2 * alloc.c - NILFS dat/inode allocator
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
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
20 * Original code was written by Koji Sato <koji@osrg.net>.
21 * Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>,
22 * Amagai Yoshiji <amagai@osrg.net>.
25 #include <linux/types.h>
26 #include <linux/buffer_head.h>
28 #include <linux/bitops.h>
29 #include <linux/slab.h>
35 * nilfs_palloc_groups_per_desc_block - get the number of groups that a group
36 * descriptor block can maintain
37 * @inode: inode of metadata file using this allocator
39 static inline unsigned long
40 nilfs_palloc_groups_per_desc_block(const struct inode *inode)
42 return (1UL << inode->i_blkbits) /
43 sizeof(struct nilfs_palloc_group_desc);
47 * nilfs_palloc_groups_count - get maximum number of groups
48 * @inode: inode of metadata file using this allocator
50 static inline unsigned long
51 nilfs_palloc_groups_count(const struct inode *inode)
53 return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */));
57 * nilfs_palloc_init_blockgroup - initialize private variables for allocator
58 * @inode: inode of metadata file using this allocator
59 * @entry_size: size of the persistent object
61 int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned entry_size)
63 struct nilfs_mdt_info *mi = NILFS_MDT(inode);
65 mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS);
69 bgl_lock_init(mi->mi_bgl);
71 nilfs_mdt_set_entry_size(inode, entry_size, 0);
73 mi->mi_blocks_per_group =
74 DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode),
75 mi->mi_entries_per_block) + 1;
76 /* Number of blocks in a group including entry blocks and
78 mi->mi_blocks_per_desc_block =
79 nilfs_palloc_groups_per_desc_block(inode) *
80 mi->mi_blocks_per_group + 1;
81 /* Number of blocks per descriptor including the
87 * nilfs_palloc_group - get group number and offset from an entry number
88 * @inode: inode of metadata file using this allocator
89 * @nr: serial number of the entry (e.g. inode number)
90 * @offset: pointer to store offset number in the group
92 static unsigned long nilfs_palloc_group(const struct inode *inode, __u64 nr,
93 unsigned long *offset)
97 *offset = do_div(group, nilfs_palloc_entries_per_group(inode));
102 * nilfs_palloc_desc_blkoff - get block offset of a group descriptor block
103 * @inode: inode of metadata file using this allocator
104 * @group: group number
106 * nilfs_palloc_desc_blkoff() returns block offset of the descriptor
107 * block which contains a descriptor of the specified group.
110 nilfs_palloc_desc_blkoff(const struct inode *inode, unsigned long group)
112 unsigned long desc_block =
113 group / nilfs_palloc_groups_per_desc_block(inode);
114 return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block;
118 * nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block
119 * @inode: inode of metadata file using this allocator
120 * @group: group number
122 * nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap
123 * block used to allocate/deallocate entries in the specified group.
126 nilfs_palloc_bitmap_blkoff(const struct inode *inode, unsigned long group)
128 unsigned long desc_offset =
129 group % nilfs_palloc_groups_per_desc_block(inode);
130 return nilfs_palloc_desc_blkoff(inode, group) + 1 +
131 desc_offset * NILFS_MDT(inode)->mi_blocks_per_group;
135 * nilfs_palloc_group_desc_nfrees - get the number of free entries in a group
136 * @desc: pointer to descriptor structure for the group
137 * @lock: spin lock protecting @desc
140 nilfs_palloc_group_desc_nfrees(const struct nilfs_palloc_group_desc *desc,
146 nfree = le32_to_cpu(desc->pg_nfrees);
152 * nilfs_palloc_group_desc_add_entries - adjust count of free entries
153 * @desc: pointer to descriptor structure for the group
154 * @lock: spin lock protecting @desc
155 * @n: delta to be added
158 nilfs_palloc_group_desc_add_entries(struct nilfs_palloc_group_desc *desc,
159 spinlock_t *lock, u32 n)
164 le32_add_cpu(&desc->pg_nfrees, n);
165 nfree = le32_to_cpu(desc->pg_nfrees);
171 * nilfs_palloc_entry_blkoff - get block offset of an entry block
172 * @inode: inode of metadata file using this allocator
173 * @nr: serial number of the entry (e.g. inode number)
176 nilfs_palloc_entry_blkoff(const struct inode *inode, __u64 nr)
178 unsigned long group, group_offset;
180 group = nilfs_palloc_group(inode, nr, &group_offset);
182 return nilfs_palloc_bitmap_blkoff(inode, group) + 1 +
183 group_offset / NILFS_MDT(inode)->mi_entries_per_block;
187 * nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block
188 * @inode: inode of metadata file
189 * @bh: buffer head of the buffer to be initialized
190 * @kaddr: kernel address mapped for the page including the buffer
192 static void nilfs_palloc_desc_block_init(struct inode *inode,
193 struct buffer_head *bh, void *kaddr)
195 struct nilfs_palloc_group_desc *desc = kaddr + bh_offset(bh);
196 unsigned long n = nilfs_palloc_groups_per_desc_block(inode);
199 nfrees = cpu_to_le32(nilfs_palloc_entries_per_group(inode));
201 desc->pg_nfrees = nfrees;
206 static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff,
208 void (*init_block)(struct inode *,
209 struct buffer_head *,
211 struct buffer_head **bhp,
212 struct nilfs_bh_assoc *prev,
218 if (prev->bh && blkoff == prev->blkoff) {
226 ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp);
230 * The following code must be safe for change of the
231 * cache contents during the get block call.
236 prev->blkoff = blkoff;
243 * nilfs_palloc_delete_block - delete a block on the persistent allocator file
244 * @inode: inode of metadata file using this allocator
245 * @blkoff: block offset
246 * @prev: nilfs_bh_assoc struct of the last used buffer
247 * @lock: spin lock protecting @prev
249 static int nilfs_palloc_delete_block(struct inode *inode, unsigned long blkoff,
250 struct nilfs_bh_assoc *prev,
254 if (prev->bh && blkoff == prev->blkoff) {
259 return nilfs_mdt_delete_block(inode, blkoff);
263 * nilfs_palloc_get_desc_block - get buffer head of a group descriptor block
264 * @inode: inode of metadata file using this allocator
265 * @group: group number
266 * @create: create flag
267 * @bhp: pointer to store the resultant buffer head
269 static int nilfs_palloc_get_desc_block(struct inode *inode,
271 int create, struct buffer_head **bhp)
273 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
275 return nilfs_palloc_get_block(inode,
276 nilfs_palloc_desc_blkoff(inode, group),
277 create, nilfs_palloc_desc_block_init,
278 bhp, &cache->prev_desc, &cache->lock);
282 * nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block
283 * @inode: inode of metadata file using this allocator
284 * @group: group number
285 * @create: create flag
286 * @bhp: pointer to store the resultant buffer head
288 static int nilfs_palloc_get_bitmap_block(struct inode *inode,
290 int create, struct buffer_head **bhp)
292 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
294 return nilfs_palloc_get_block(inode,
295 nilfs_palloc_bitmap_blkoff(inode, group),
297 &cache->prev_bitmap, &cache->lock);
301 * nilfs_palloc_delete_bitmap_block - delete a bitmap block
302 * @inode: inode of metadata file using this allocator
303 * @group: group number
305 static int nilfs_palloc_delete_bitmap_block(struct inode *inode,
308 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
310 return nilfs_palloc_delete_block(inode,
311 nilfs_palloc_bitmap_blkoff(inode,
313 &cache->prev_bitmap, &cache->lock);
317 * nilfs_palloc_get_entry_block - get buffer head of an entry block
318 * @inode: inode of metadata file using this allocator
319 * @nr: serial number of the entry (e.g. inode number)
320 * @create: create flag
321 * @bhp: pointer to store the resultant buffer head
323 int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr,
324 int create, struct buffer_head **bhp)
326 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
328 return nilfs_palloc_get_block(inode,
329 nilfs_palloc_entry_blkoff(inode, nr),
331 &cache->prev_entry, &cache->lock);
335 * nilfs_palloc_delete_entry_block - delete an entry block
336 * @inode: inode of metadata file using this allocator
337 * @nr: serial number of the entry
339 static int nilfs_palloc_delete_entry_block(struct inode *inode, __u64 nr)
341 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
343 return nilfs_palloc_delete_block(inode,
344 nilfs_palloc_entry_blkoff(inode, nr),
345 &cache->prev_entry, &cache->lock);
349 * nilfs_palloc_block_get_group_desc - get kernel address of a group descriptor
350 * @inode: inode of metadata file using this allocator
351 * @group: group number
352 * @bh: buffer head of the buffer storing the group descriptor block
353 * @kaddr: kernel address mapped for the page including the buffer
355 static struct nilfs_palloc_group_desc *
356 nilfs_palloc_block_get_group_desc(const struct inode *inode,
358 const struct buffer_head *bh, void *kaddr)
360 return (struct nilfs_palloc_group_desc *)(kaddr + bh_offset(bh)) +
361 group % nilfs_palloc_groups_per_desc_block(inode);
365 * nilfs_palloc_block_get_entry - get kernel address of an entry
366 * @inode: inode of metadata file using this allocator
367 * @nr: serial number of the entry (e.g. inode number)
368 * @bh: buffer head of the buffer storing the entry block
369 * @kaddr: kernel address mapped for the page including the buffer
371 void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr,
372 const struct buffer_head *bh, void *kaddr)
374 unsigned long entry_offset, group_offset;
376 nilfs_palloc_group(inode, nr, &group_offset);
377 entry_offset = group_offset % NILFS_MDT(inode)->mi_entries_per_block;
379 return kaddr + bh_offset(bh) +
380 entry_offset * NILFS_MDT(inode)->mi_entry_size;
384 * nilfs_palloc_find_available_slot - find available slot in a group
385 * @bitmap: bitmap of the group
386 * @target: offset number of an entry in the group (start point)
387 * @bsize: size in bits
388 * @lock: spin lock protecting @bitmap
390 static int nilfs_palloc_find_available_slot(unsigned char *bitmap,
391 unsigned long target,
395 int pos, end = bsize;
397 if (likely(target < bsize)) {
400 pos = nilfs_find_next_zero_bit(bitmap, end, pos);
403 if (!nilfs_set_bit_atomic(lock, pos, bitmap))
405 } while (++pos < end);
411 for (pos = 0; pos < end; pos++) {
412 pos = nilfs_find_next_zero_bit(bitmap, end, pos);
415 if (!nilfs_set_bit_atomic(lock, pos, bitmap))
423 * nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups
424 * in a group descriptor block
425 * @inode: inode of metadata file using this allocator
426 * @curr: current group number
427 * @max: maximum number of groups
430 nilfs_palloc_rest_groups_in_desc_block(const struct inode *inode,
431 unsigned long curr, unsigned long max)
433 return min_t(unsigned long,
434 nilfs_palloc_groups_per_desc_block(inode) -
435 curr % nilfs_palloc_groups_per_desc_block(inode),
440 * nilfs_palloc_count_desc_blocks - count descriptor blocks number
441 * @inode: inode of metadata file using this allocator
442 * @desc_blocks: descriptor blocks number [out]
444 static int nilfs_palloc_count_desc_blocks(struct inode *inode,
445 unsigned long *desc_blocks)
450 ret = nilfs_bmap_last_key(NILFS_I(inode)->i_bmap, &blknum);
452 *desc_blocks = DIV_ROUND_UP(
453 (unsigned long)blknum,
454 NILFS_MDT(inode)->mi_blocks_per_desc_block);
459 * nilfs_palloc_mdt_file_can_grow - check potential opportunity for
461 * @inode: inode of metadata file using this allocator
462 * @desc_blocks: known current descriptor blocks count
464 static inline bool nilfs_palloc_mdt_file_can_grow(struct inode *inode,
465 unsigned long desc_blocks)
467 return (nilfs_palloc_groups_per_desc_block(inode) * desc_blocks) <
468 nilfs_palloc_groups_count(inode);
472 * nilfs_palloc_count_max_entries - count max number of entries that can be
473 * described by descriptor blocks count
474 * @inode: inode of metadata file using this allocator
475 * @nused: current number of used entries
476 * @nmaxp: max number of entries [out]
478 int nilfs_palloc_count_max_entries(struct inode *inode, u64 nused, u64 *nmaxp)
480 unsigned long desc_blocks = 0;
481 u64 entries_per_desc_block, nmax;
484 err = nilfs_palloc_count_desc_blocks(inode, &desc_blocks);
488 entries_per_desc_block = (u64)nilfs_palloc_entries_per_group(inode) *
489 nilfs_palloc_groups_per_desc_block(inode);
490 nmax = entries_per_desc_block * desc_blocks;
493 nilfs_palloc_mdt_file_can_grow(inode, desc_blocks))
494 nmax += entries_per_desc_block;
504 * nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object
505 * @inode: inode of metadata file using this allocator
506 * @req: nilfs_palloc_req structure exchanged for the allocation
508 int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
509 struct nilfs_palloc_req *req)
511 struct buffer_head *desc_bh, *bitmap_bh;
512 struct nilfs_palloc_group_desc *desc;
513 unsigned char *bitmap;
514 void *desc_kaddr, *bitmap_kaddr;
515 unsigned long group, maxgroup, ngroups;
516 unsigned long group_offset, maxgroup_offset;
517 unsigned long n, entries_per_group, groups_per_desc_block;
522 ngroups = nilfs_palloc_groups_count(inode);
523 maxgroup = ngroups - 1;
524 group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
525 entries_per_group = nilfs_palloc_entries_per_group(inode);
526 groups_per_desc_block = nilfs_palloc_groups_per_desc_block(inode);
528 for (i = 0; i < ngroups; i += n) {
529 if (group >= ngroups) {
532 maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr,
533 &maxgroup_offset) - 1;
535 ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
538 desc_kaddr = kmap(desc_bh->b_page);
539 desc = nilfs_palloc_block_get_group_desc(
540 inode, group, desc_bh, desc_kaddr);
541 n = nilfs_palloc_rest_groups_in_desc_block(inode, group,
543 for (j = 0; j < n; j++, desc++, group++) {
544 lock = nilfs_mdt_bgl_lock(inode, group);
545 if (nilfs_palloc_group_desc_nfrees(desc, lock) > 0) {
546 ret = nilfs_palloc_get_bitmap_block(
547 inode, group, 1, &bitmap_bh);
550 bitmap_kaddr = kmap(bitmap_bh->b_page);
551 bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
552 pos = nilfs_palloc_find_available_slot(
553 bitmap, group_offset,
554 entries_per_group, lock);
556 /* found a free entry */
557 nilfs_palloc_group_desc_add_entries(
560 entries_per_group * group + pos;
561 kunmap(desc_bh->b_page);
562 kunmap(bitmap_bh->b_page);
564 req->pr_desc_bh = desc_bh;
565 req->pr_bitmap_bh = bitmap_bh;
568 kunmap(bitmap_bh->b_page);
575 kunmap(desc_bh->b_page);
579 /* no entries left */
583 kunmap(desc_bh->b_page);
589 * nilfs_palloc_commit_alloc_entry - finish allocation of a persistent object
590 * @inode: inode of metadata file using this allocator
591 * @req: nilfs_palloc_req structure exchanged for the allocation
593 void nilfs_palloc_commit_alloc_entry(struct inode *inode,
594 struct nilfs_palloc_req *req)
596 mark_buffer_dirty(req->pr_bitmap_bh);
597 mark_buffer_dirty(req->pr_desc_bh);
598 nilfs_mdt_mark_dirty(inode);
600 brelse(req->pr_bitmap_bh);
601 brelse(req->pr_desc_bh);
605 * nilfs_palloc_commit_free_entry - finish deallocating a persistent object
606 * @inode: inode of metadata file using this allocator
607 * @req: nilfs_palloc_req structure exchanged for the removal
609 void nilfs_palloc_commit_free_entry(struct inode *inode,
610 struct nilfs_palloc_req *req)
612 struct nilfs_palloc_group_desc *desc;
613 unsigned long group, group_offset;
614 unsigned char *bitmap;
615 void *desc_kaddr, *bitmap_kaddr;
618 group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
619 desc_kaddr = kmap(req->pr_desc_bh->b_page);
620 desc = nilfs_palloc_block_get_group_desc(inode, group,
621 req->pr_desc_bh, desc_kaddr);
622 bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
623 bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
624 lock = nilfs_mdt_bgl_lock(inode, group);
626 if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap))
627 nilfs_warning(inode->i_sb, __func__,
628 "entry number %llu already freed: ino=%lu\n",
629 (unsigned long long)req->pr_entry_nr,
630 (unsigned long)inode->i_ino);
632 nilfs_palloc_group_desc_add_entries(desc, lock, 1);
634 kunmap(req->pr_bitmap_bh->b_page);
635 kunmap(req->pr_desc_bh->b_page);
637 mark_buffer_dirty(req->pr_desc_bh);
638 mark_buffer_dirty(req->pr_bitmap_bh);
639 nilfs_mdt_mark_dirty(inode);
641 brelse(req->pr_bitmap_bh);
642 brelse(req->pr_desc_bh);
646 * nilfs_palloc_abort_alloc_entry - cancel allocation of a persistent object
647 * @inode: inode of metadata file using this allocator
648 * @req: nilfs_palloc_req structure exchanged for the allocation
650 void nilfs_palloc_abort_alloc_entry(struct inode *inode,
651 struct nilfs_palloc_req *req)
653 struct nilfs_palloc_group_desc *desc;
654 void *desc_kaddr, *bitmap_kaddr;
655 unsigned char *bitmap;
656 unsigned long group, group_offset;
659 group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
660 desc_kaddr = kmap(req->pr_desc_bh->b_page);
661 desc = nilfs_palloc_block_get_group_desc(inode, group,
662 req->pr_desc_bh, desc_kaddr);
663 bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
664 bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
665 lock = nilfs_mdt_bgl_lock(inode, group);
667 if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap))
668 nilfs_warning(inode->i_sb, __func__,
669 "entry number %llu already freed: ino=%lu\n",
670 (unsigned long long)req->pr_entry_nr,
671 (unsigned long)inode->i_ino);
673 nilfs_palloc_group_desc_add_entries(desc, lock, 1);
675 kunmap(req->pr_bitmap_bh->b_page);
676 kunmap(req->pr_desc_bh->b_page);
678 brelse(req->pr_bitmap_bh);
679 brelse(req->pr_desc_bh);
681 req->pr_entry_nr = 0;
682 req->pr_bitmap_bh = NULL;
683 req->pr_desc_bh = NULL;
687 * nilfs_palloc_prepare_free_entry - prepare to deallocate a persistent object
688 * @inode: inode of metadata file using this allocator
689 * @req: nilfs_palloc_req structure exchanged for the removal
691 int nilfs_palloc_prepare_free_entry(struct inode *inode,
692 struct nilfs_palloc_req *req)
694 struct buffer_head *desc_bh, *bitmap_bh;
695 unsigned long group, group_offset;
698 group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
699 ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
702 ret = nilfs_palloc_get_bitmap_block(inode, group, 1, &bitmap_bh);
708 req->pr_desc_bh = desc_bh;
709 req->pr_bitmap_bh = bitmap_bh;
714 * nilfs_palloc_abort_free_entry - cancel deallocating a persistent object
715 * @inode: inode of metadata file using this allocator
716 * @req: nilfs_palloc_req structure exchanged for the removal
718 void nilfs_palloc_abort_free_entry(struct inode *inode,
719 struct nilfs_palloc_req *req)
721 brelse(req->pr_bitmap_bh);
722 brelse(req->pr_desc_bh);
724 req->pr_entry_nr = 0;
725 req->pr_bitmap_bh = NULL;
726 req->pr_desc_bh = NULL;
730 * nilfs_palloc_freev - deallocate a set of persistent objects
731 * @inode: inode of metadata file using this allocator
732 * @entry_nrs: array of entry numbers to be deallocated
733 * @nitems: number of entries stored in @entry_nrs
735 int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
737 struct buffer_head *desc_bh, *bitmap_bh;
738 struct nilfs_palloc_group_desc *desc;
739 unsigned char *bitmap;
740 void *desc_kaddr, *bitmap_kaddr;
741 unsigned long group, group_offset;
742 __u64 group_min_nr, last_nrs[8];
743 const unsigned long epg = nilfs_palloc_entries_per_group(inode);
744 const unsigned epb = NILFS_MDT(inode)->mi_entries_per_block;
745 unsigned entry_start, end, pos;
750 for (i = 0; i < nitems; i = j) {
751 int change_group = false;
752 int nempties = 0, n = 0;
754 group = nilfs_palloc_group(inode, entry_nrs[i], &group_offset);
755 ret = nilfs_palloc_get_desc_block(inode, group, 0, &desc_bh);
758 ret = nilfs_palloc_get_bitmap_block(inode, group, 0,
765 /* Get the first entry number of the group */
766 group_min_nr = (__u64)group * epg;
768 bitmap_kaddr = kmap(bitmap_bh->b_page);
769 bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
770 lock = nilfs_mdt_bgl_lock(inode, group);
773 entry_start = rounddown(group_offset, epb);
775 if (!nilfs_clear_bit_atomic(lock, group_offset,
777 nilfs_warning(inode->i_sb, __func__,
778 "entry number %llu already freed: ino=%lu\n",
779 (unsigned long long)entry_nrs[j],
780 (unsigned long)inode->i_ino);
786 if (j >= nitems || entry_nrs[j] < group_min_nr ||
787 entry_nrs[j] >= group_min_nr + epg) {
790 group_offset = entry_nrs[j] - group_min_nr;
791 if (group_offset >= entry_start &&
792 group_offset < entry_start + epb) {
793 /* This entry is in the same block */
798 /* Test if the entry block is empty or not */
799 end = entry_start + epb;
800 pos = nilfs_find_next_bit(bitmap, end, entry_start);
802 last_nrs[nempties++] = entry_nrs[j - 1];
803 if (nempties >= ARRAY_SIZE(last_nrs))
810 /* Go on to the next entry block */
811 entry_start = rounddown(group_offset, epb);
814 kunmap(bitmap_bh->b_page);
815 mark_buffer_dirty(bitmap_bh);
818 for (k = 0; k < nempties; k++) {
819 ret = nilfs_palloc_delete_entry_block(inode,
821 if (ret && ret != -ENOENT) {
822 nilfs_warning(inode->i_sb, __func__,
823 "failed to delete block of entry %llu: ino=%lu, err=%d\n",
824 (unsigned long long)last_nrs[k],
825 (unsigned long)inode->i_ino, ret);
829 desc_kaddr = kmap_atomic(desc_bh->b_page);
830 desc = nilfs_palloc_block_get_group_desc(
831 inode, group, desc_bh, desc_kaddr);
832 nfree = nilfs_palloc_group_desc_add_entries(desc, lock, n);
833 kunmap_atomic(desc_kaddr);
834 mark_buffer_dirty(desc_bh);
835 nilfs_mdt_mark_dirty(inode);
838 if (nfree == nilfs_palloc_entries_per_group(inode)) {
839 ret = nilfs_palloc_delete_bitmap_block(inode, group);
840 if (ret && ret != -ENOENT) {
841 nilfs_warning(inode->i_sb, __func__,
842 "failed to delete bitmap block of group %lu: ino=%lu, err=%d\n",
844 (unsigned long)inode->i_ino, ret);
851 void nilfs_palloc_setup_cache(struct inode *inode,
852 struct nilfs_palloc_cache *cache)
854 NILFS_MDT(inode)->mi_palloc_cache = cache;
855 spin_lock_init(&cache->lock);
858 void nilfs_palloc_clear_cache(struct inode *inode)
860 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
862 spin_lock(&cache->lock);
863 brelse(cache->prev_desc.bh);
864 brelse(cache->prev_bitmap.bh);
865 brelse(cache->prev_entry.bh);
866 cache->prev_desc.bh = NULL;
867 cache->prev_bitmap.bh = NULL;
868 cache->prev_entry.bh = NULL;
869 spin_unlock(&cache->lock);
872 void nilfs_palloc_destroy_cache(struct inode *inode)
874 nilfs_palloc_clear_cache(inode);
875 NILFS_MDT(inode)->mi_palloc_cache = NULL;