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 * Originally written by Koji Sato.
17 * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
20 #include <linux/types.h>
21 #include <linux/buffer_head.h>
23 #include <linux/bitops.h>
24 #include <linux/slab.h>
30 * nilfs_palloc_groups_per_desc_block - get the number of groups that a group
31 * descriptor block can maintain
32 * @inode: inode of metadata file using this allocator
34 static inline unsigned long
35 nilfs_palloc_groups_per_desc_block(const struct inode *inode)
37 return (1UL << inode->i_blkbits) /
38 sizeof(struct nilfs_palloc_group_desc);
42 * nilfs_palloc_groups_count - get maximum number of groups
43 * @inode: inode of metadata file using this allocator
45 static inline unsigned long
46 nilfs_palloc_groups_count(const struct inode *inode)
48 return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */));
52 * nilfs_palloc_init_blockgroup - initialize private variables for allocator
53 * @inode: inode of metadata file using this allocator
54 * @entry_size: size of the persistent object
56 int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned entry_size)
58 struct nilfs_mdt_info *mi = NILFS_MDT(inode);
60 mi->mi_bgl = kmalloc(sizeof(*mi->mi_bgl), GFP_NOFS);
64 bgl_lock_init(mi->mi_bgl);
66 nilfs_mdt_set_entry_size(inode, entry_size, 0);
68 mi->mi_blocks_per_group =
69 DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode),
70 mi->mi_entries_per_block) + 1;
71 /* Number of blocks in a group including entry blocks and
73 mi->mi_blocks_per_desc_block =
74 nilfs_palloc_groups_per_desc_block(inode) *
75 mi->mi_blocks_per_group + 1;
76 /* Number of blocks per descriptor including the
82 * nilfs_palloc_group - get group number and offset from an entry number
83 * @inode: inode of metadata file using this allocator
84 * @nr: serial number of the entry (e.g. inode number)
85 * @offset: pointer to store offset number in the group
87 static unsigned long nilfs_palloc_group(const struct inode *inode, __u64 nr,
88 unsigned long *offset)
92 *offset = do_div(group, nilfs_palloc_entries_per_group(inode));
97 * nilfs_palloc_desc_blkoff - get block offset of a group descriptor block
98 * @inode: inode of metadata file using this allocator
99 * @group: group number
101 * nilfs_palloc_desc_blkoff() returns block offset of the descriptor
102 * block which contains a descriptor of the specified group.
105 nilfs_palloc_desc_blkoff(const struct inode *inode, unsigned long group)
107 unsigned long desc_block =
108 group / nilfs_palloc_groups_per_desc_block(inode);
109 return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block;
113 * nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block
114 * @inode: inode of metadata file using this allocator
115 * @group: group number
117 * nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap
118 * block used to allocate/deallocate entries in the specified group.
121 nilfs_palloc_bitmap_blkoff(const struct inode *inode, unsigned long group)
123 unsigned long desc_offset =
124 group % nilfs_palloc_groups_per_desc_block(inode);
125 return nilfs_palloc_desc_blkoff(inode, group) + 1 +
126 desc_offset * NILFS_MDT(inode)->mi_blocks_per_group;
130 * nilfs_palloc_group_desc_nfrees - get the number of free entries in a group
131 * @desc: pointer to descriptor structure for the group
132 * @lock: spin lock protecting @desc
135 nilfs_palloc_group_desc_nfrees(const struct nilfs_palloc_group_desc *desc,
141 nfree = le32_to_cpu(desc->pg_nfrees);
147 * nilfs_palloc_group_desc_add_entries - adjust count of free entries
148 * @desc: pointer to descriptor structure for the group
149 * @lock: spin lock protecting @desc
150 * @n: delta to be added
153 nilfs_palloc_group_desc_add_entries(struct nilfs_palloc_group_desc *desc,
154 spinlock_t *lock, u32 n)
159 le32_add_cpu(&desc->pg_nfrees, n);
160 nfree = le32_to_cpu(desc->pg_nfrees);
166 * nilfs_palloc_entry_blkoff - get block offset of an entry block
167 * @inode: inode of metadata file using this allocator
168 * @nr: serial number of the entry (e.g. inode number)
171 nilfs_palloc_entry_blkoff(const struct inode *inode, __u64 nr)
173 unsigned long group, group_offset;
175 group = nilfs_palloc_group(inode, nr, &group_offset);
177 return nilfs_palloc_bitmap_blkoff(inode, group) + 1 +
178 group_offset / NILFS_MDT(inode)->mi_entries_per_block;
182 * nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block
183 * @inode: inode of metadata file
184 * @bh: buffer head of the buffer to be initialized
185 * @kaddr: kernel address mapped for the page including the buffer
187 static void nilfs_palloc_desc_block_init(struct inode *inode,
188 struct buffer_head *bh, void *kaddr)
190 struct nilfs_palloc_group_desc *desc = kaddr + bh_offset(bh);
191 unsigned long n = nilfs_palloc_groups_per_desc_block(inode);
194 nfrees = cpu_to_le32(nilfs_palloc_entries_per_group(inode));
196 desc->pg_nfrees = nfrees;
201 static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff,
203 void (*init_block)(struct inode *,
204 struct buffer_head *,
206 struct buffer_head **bhp,
207 struct nilfs_bh_assoc *prev,
213 if (prev->bh && blkoff == prev->blkoff) {
221 ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp);
225 * The following code must be safe for change of the
226 * cache contents during the get block call.
231 prev->blkoff = blkoff;
238 * nilfs_palloc_delete_block - delete a block on the persistent allocator file
239 * @inode: inode of metadata file using this allocator
240 * @blkoff: block offset
241 * @prev: nilfs_bh_assoc struct of the last used buffer
242 * @lock: spin lock protecting @prev
244 static int nilfs_palloc_delete_block(struct inode *inode, unsigned long blkoff,
245 struct nilfs_bh_assoc *prev,
249 if (prev->bh && blkoff == prev->blkoff) {
254 return nilfs_mdt_delete_block(inode, blkoff);
258 * nilfs_palloc_get_desc_block - get buffer head of a group descriptor block
259 * @inode: inode of metadata file using this allocator
260 * @group: group number
261 * @create: create flag
262 * @bhp: pointer to store the resultant buffer head
264 static int nilfs_palloc_get_desc_block(struct inode *inode,
266 int create, struct buffer_head **bhp)
268 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
270 return nilfs_palloc_get_block(inode,
271 nilfs_palloc_desc_blkoff(inode, group),
272 create, nilfs_palloc_desc_block_init,
273 bhp, &cache->prev_desc, &cache->lock);
277 * nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block
278 * @inode: inode of metadata file using this allocator
279 * @group: group number
280 * @create: create flag
281 * @bhp: pointer to store the resultant buffer head
283 static int nilfs_palloc_get_bitmap_block(struct inode *inode,
285 int create, struct buffer_head **bhp)
287 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
289 return nilfs_palloc_get_block(inode,
290 nilfs_palloc_bitmap_blkoff(inode, group),
292 &cache->prev_bitmap, &cache->lock);
296 * nilfs_palloc_delete_bitmap_block - delete a bitmap block
297 * @inode: inode of metadata file using this allocator
298 * @group: group number
300 static int nilfs_palloc_delete_bitmap_block(struct inode *inode,
303 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
305 return nilfs_palloc_delete_block(inode,
306 nilfs_palloc_bitmap_blkoff(inode,
308 &cache->prev_bitmap, &cache->lock);
312 * nilfs_palloc_get_entry_block - get buffer head of an entry block
313 * @inode: inode of metadata file using this allocator
314 * @nr: serial number of the entry (e.g. inode number)
315 * @create: create flag
316 * @bhp: pointer to store the resultant buffer head
318 int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr,
319 int create, struct buffer_head **bhp)
321 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
323 return nilfs_palloc_get_block(inode,
324 nilfs_palloc_entry_blkoff(inode, nr),
326 &cache->prev_entry, &cache->lock);
330 * nilfs_palloc_delete_entry_block - delete an entry block
331 * @inode: inode of metadata file using this allocator
332 * @nr: serial number of the entry
334 static int nilfs_palloc_delete_entry_block(struct inode *inode, __u64 nr)
336 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
338 return nilfs_palloc_delete_block(inode,
339 nilfs_palloc_entry_blkoff(inode, nr),
340 &cache->prev_entry, &cache->lock);
344 * nilfs_palloc_block_get_group_desc - get kernel address of a group descriptor
345 * @inode: inode of metadata file using this allocator
346 * @group: group number
347 * @bh: buffer head of the buffer storing the group descriptor block
348 * @kaddr: kernel address mapped for the page including the buffer
350 static struct nilfs_palloc_group_desc *
351 nilfs_palloc_block_get_group_desc(const struct inode *inode,
353 const struct buffer_head *bh, void *kaddr)
355 return (struct nilfs_palloc_group_desc *)(kaddr + bh_offset(bh)) +
356 group % nilfs_palloc_groups_per_desc_block(inode);
360 * nilfs_palloc_block_get_entry - get kernel address of an entry
361 * @inode: inode of metadata file using this allocator
362 * @nr: serial number of the entry (e.g. inode number)
363 * @bh: buffer head of the buffer storing the entry block
364 * @kaddr: kernel address mapped for the page including the buffer
366 void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr,
367 const struct buffer_head *bh, void *kaddr)
369 unsigned long entry_offset, group_offset;
371 nilfs_palloc_group(inode, nr, &group_offset);
372 entry_offset = group_offset % NILFS_MDT(inode)->mi_entries_per_block;
374 return kaddr + bh_offset(bh) +
375 entry_offset * NILFS_MDT(inode)->mi_entry_size;
379 * nilfs_palloc_find_available_slot - find available slot in a group
380 * @bitmap: bitmap of the group
381 * @target: offset number of an entry in the group (start point)
382 * @bsize: size in bits
383 * @lock: spin lock protecting @bitmap
385 static int nilfs_palloc_find_available_slot(unsigned char *bitmap,
386 unsigned long target,
390 int pos, end = bsize;
392 if (likely(target < bsize)) {
395 pos = nilfs_find_next_zero_bit(bitmap, end, pos);
398 if (!nilfs_set_bit_atomic(lock, pos, bitmap))
400 } while (++pos < end);
406 for (pos = 0; pos < end; pos++) {
407 pos = nilfs_find_next_zero_bit(bitmap, end, pos);
410 if (!nilfs_set_bit_atomic(lock, pos, bitmap))
418 * nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups
419 * in a group descriptor block
420 * @inode: inode of metadata file using this allocator
421 * @curr: current group number
422 * @max: maximum number of groups
425 nilfs_palloc_rest_groups_in_desc_block(const struct inode *inode,
426 unsigned long curr, unsigned long max)
428 return min_t(unsigned long,
429 nilfs_palloc_groups_per_desc_block(inode) -
430 curr % nilfs_palloc_groups_per_desc_block(inode),
435 * nilfs_palloc_count_desc_blocks - count descriptor blocks number
436 * @inode: inode of metadata file using this allocator
437 * @desc_blocks: descriptor blocks number [out]
439 static int nilfs_palloc_count_desc_blocks(struct inode *inode,
440 unsigned long *desc_blocks)
445 ret = nilfs_bmap_last_key(NILFS_I(inode)->i_bmap, &blknum);
447 *desc_blocks = DIV_ROUND_UP(
448 (unsigned long)blknum,
449 NILFS_MDT(inode)->mi_blocks_per_desc_block);
454 * nilfs_palloc_mdt_file_can_grow - check potential opportunity for
456 * @inode: inode of metadata file using this allocator
457 * @desc_blocks: known current descriptor blocks count
459 static inline bool nilfs_palloc_mdt_file_can_grow(struct inode *inode,
460 unsigned long desc_blocks)
462 return (nilfs_palloc_groups_per_desc_block(inode) * desc_blocks) <
463 nilfs_palloc_groups_count(inode);
467 * nilfs_palloc_count_max_entries - count max number of entries that can be
468 * described by descriptor blocks count
469 * @inode: inode of metadata file using this allocator
470 * @nused: current number of used entries
471 * @nmaxp: max number of entries [out]
473 int nilfs_palloc_count_max_entries(struct inode *inode, u64 nused, u64 *nmaxp)
475 unsigned long desc_blocks = 0;
476 u64 entries_per_desc_block, nmax;
479 err = nilfs_palloc_count_desc_blocks(inode, &desc_blocks);
483 entries_per_desc_block = (u64)nilfs_palloc_entries_per_group(inode) *
484 nilfs_palloc_groups_per_desc_block(inode);
485 nmax = entries_per_desc_block * desc_blocks;
488 nilfs_palloc_mdt_file_can_grow(inode, desc_blocks))
489 nmax += entries_per_desc_block;
499 * nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object
500 * @inode: inode of metadata file using this allocator
501 * @req: nilfs_palloc_req structure exchanged for the allocation
503 int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
504 struct nilfs_palloc_req *req)
506 struct buffer_head *desc_bh, *bitmap_bh;
507 struct nilfs_palloc_group_desc *desc;
508 unsigned char *bitmap;
509 void *desc_kaddr, *bitmap_kaddr;
510 unsigned long group, maxgroup, ngroups;
511 unsigned long group_offset, maxgroup_offset;
512 unsigned long n, entries_per_group;
517 ngroups = nilfs_palloc_groups_count(inode);
518 maxgroup = ngroups - 1;
519 group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
520 entries_per_group = nilfs_palloc_entries_per_group(inode);
522 for (i = 0; i < ngroups; i += n) {
523 if (group >= ngroups) {
526 maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr,
527 &maxgroup_offset) - 1;
529 ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
532 desc_kaddr = kmap(desc_bh->b_page);
533 desc = nilfs_palloc_block_get_group_desc(
534 inode, group, desc_bh, desc_kaddr);
535 n = nilfs_palloc_rest_groups_in_desc_block(inode, group,
537 for (j = 0; j < n; j++, desc++, group++) {
538 lock = nilfs_mdt_bgl_lock(inode, group);
539 if (nilfs_palloc_group_desc_nfrees(desc, lock) > 0) {
540 ret = nilfs_palloc_get_bitmap_block(
541 inode, group, 1, &bitmap_bh);
544 bitmap_kaddr = kmap(bitmap_bh->b_page);
545 bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
546 pos = nilfs_palloc_find_available_slot(
547 bitmap, group_offset,
548 entries_per_group, lock);
550 /* found a free entry */
551 nilfs_palloc_group_desc_add_entries(
554 entries_per_group * group + pos;
555 kunmap(desc_bh->b_page);
556 kunmap(bitmap_bh->b_page);
558 req->pr_desc_bh = desc_bh;
559 req->pr_bitmap_bh = bitmap_bh;
562 kunmap(bitmap_bh->b_page);
569 kunmap(desc_bh->b_page);
573 /* no entries left */
577 kunmap(desc_bh->b_page);
583 * nilfs_palloc_commit_alloc_entry - finish allocation of a persistent object
584 * @inode: inode of metadata file using this allocator
585 * @req: nilfs_palloc_req structure exchanged for the allocation
587 void nilfs_palloc_commit_alloc_entry(struct inode *inode,
588 struct nilfs_palloc_req *req)
590 mark_buffer_dirty(req->pr_bitmap_bh);
591 mark_buffer_dirty(req->pr_desc_bh);
592 nilfs_mdt_mark_dirty(inode);
594 brelse(req->pr_bitmap_bh);
595 brelse(req->pr_desc_bh);
599 * nilfs_palloc_commit_free_entry - finish deallocating a persistent object
600 * @inode: inode of metadata file using this allocator
601 * @req: nilfs_palloc_req structure exchanged for the removal
603 void nilfs_palloc_commit_free_entry(struct inode *inode,
604 struct nilfs_palloc_req *req)
606 struct nilfs_palloc_group_desc *desc;
607 unsigned long group, group_offset;
608 unsigned char *bitmap;
609 void *desc_kaddr, *bitmap_kaddr;
612 group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
613 desc_kaddr = kmap(req->pr_desc_bh->b_page);
614 desc = nilfs_palloc_block_get_group_desc(inode, group,
615 req->pr_desc_bh, desc_kaddr);
616 bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
617 bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
618 lock = nilfs_mdt_bgl_lock(inode, group);
620 if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap))
621 nilfs_warning(inode->i_sb, __func__,
622 "entry number %llu already freed: ino=%lu\n",
623 (unsigned long long)req->pr_entry_nr,
624 (unsigned long)inode->i_ino);
626 nilfs_palloc_group_desc_add_entries(desc, lock, 1);
628 kunmap(req->pr_bitmap_bh->b_page);
629 kunmap(req->pr_desc_bh->b_page);
631 mark_buffer_dirty(req->pr_desc_bh);
632 mark_buffer_dirty(req->pr_bitmap_bh);
633 nilfs_mdt_mark_dirty(inode);
635 brelse(req->pr_bitmap_bh);
636 brelse(req->pr_desc_bh);
640 * nilfs_palloc_abort_alloc_entry - cancel allocation of a persistent object
641 * @inode: inode of metadata file using this allocator
642 * @req: nilfs_palloc_req structure exchanged for the allocation
644 void nilfs_palloc_abort_alloc_entry(struct inode *inode,
645 struct nilfs_palloc_req *req)
647 struct nilfs_palloc_group_desc *desc;
648 void *desc_kaddr, *bitmap_kaddr;
649 unsigned char *bitmap;
650 unsigned long group, group_offset;
653 group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
654 desc_kaddr = kmap(req->pr_desc_bh->b_page);
655 desc = nilfs_palloc_block_get_group_desc(inode, group,
656 req->pr_desc_bh, desc_kaddr);
657 bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
658 bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
659 lock = nilfs_mdt_bgl_lock(inode, group);
661 if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap))
662 nilfs_warning(inode->i_sb, __func__,
663 "entry number %llu already freed: ino=%lu\n",
664 (unsigned long long)req->pr_entry_nr,
665 (unsigned long)inode->i_ino);
667 nilfs_palloc_group_desc_add_entries(desc, lock, 1);
669 kunmap(req->pr_bitmap_bh->b_page);
670 kunmap(req->pr_desc_bh->b_page);
672 brelse(req->pr_bitmap_bh);
673 brelse(req->pr_desc_bh);
675 req->pr_entry_nr = 0;
676 req->pr_bitmap_bh = NULL;
677 req->pr_desc_bh = NULL;
681 * nilfs_palloc_prepare_free_entry - prepare to deallocate a persistent object
682 * @inode: inode of metadata file using this allocator
683 * @req: nilfs_palloc_req structure exchanged for the removal
685 int nilfs_palloc_prepare_free_entry(struct inode *inode,
686 struct nilfs_palloc_req *req)
688 struct buffer_head *desc_bh, *bitmap_bh;
689 unsigned long group, group_offset;
692 group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset);
693 ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh);
696 ret = nilfs_palloc_get_bitmap_block(inode, group, 1, &bitmap_bh);
702 req->pr_desc_bh = desc_bh;
703 req->pr_bitmap_bh = bitmap_bh;
708 * nilfs_palloc_abort_free_entry - cancel deallocating a persistent object
709 * @inode: inode of metadata file using this allocator
710 * @req: nilfs_palloc_req structure exchanged for the removal
712 void nilfs_palloc_abort_free_entry(struct inode *inode,
713 struct nilfs_palloc_req *req)
715 brelse(req->pr_bitmap_bh);
716 brelse(req->pr_desc_bh);
718 req->pr_entry_nr = 0;
719 req->pr_bitmap_bh = NULL;
720 req->pr_desc_bh = NULL;
724 * nilfs_palloc_freev - deallocate a set of persistent objects
725 * @inode: inode of metadata file using this allocator
726 * @entry_nrs: array of entry numbers to be deallocated
727 * @nitems: number of entries stored in @entry_nrs
729 int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
731 struct buffer_head *desc_bh, *bitmap_bh;
732 struct nilfs_palloc_group_desc *desc;
733 unsigned char *bitmap;
734 void *desc_kaddr, *bitmap_kaddr;
735 unsigned long group, group_offset;
736 __u64 group_min_nr, last_nrs[8];
737 const unsigned long epg = nilfs_palloc_entries_per_group(inode);
738 const unsigned epb = NILFS_MDT(inode)->mi_entries_per_block;
739 unsigned entry_start, end, pos;
744 for (i = 0; i < nitems; i = j) {
745 int change_group = false;
746 int nempties = 0, n = 0;
748 group = nilfs_palloc_group(inode, entry_nrs[i], &group_offset);
749 ret = nilfs_palloc_get_desc_block(inode, group, 0, &desc_bh);
752 ret = nilfs_palloc_get_bitmap_block(inode, group, 0,
759 /* Get the first entry number of the group */
760 group_min_nr = (__u64)group * epg;
762 bitmap_kaddr = kmap(bitmap_bh->b_page);
763 bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
764 lock = nilfs_mdt_bgl_lock(inode, group);
767 entry_start = rounddown(group_offset, epb);
769 if (!nilfs_clear_bit_atomic(lock, group_offset,
771 nilfs_warning(inode->i_sb, __func__,
772 "entry number %llu already freed: ino=%lu\n",
773 (unsigned long long)entry_nrs[j],
774 (unsigned long)inode->i_ino);
780 if (j >= nitems || entry_nrs[j] < group_min_nr ||
781 entry_nrs[j] >= group_min_nr + epg) {
784 group_offset = entry_nrs[j] - group_min_nr;
785 if (group_offset >= entry_start &&
786 group_offset < entry_start + epb) {
787 /* This entry is in the same block */
792 /* Test if the entry block is empty or not */
793 end = entry_start + epb;
794 pos = nilfs_find_next_bit(bitmap, end, entry_start);
796 last_nrs[nempties++] = entry_nrs[j - 1];
797 if (nempties >= ARRAY_SIZE(last_nrs))
804 /* Go on to the next entry block */
805 entry_start = rounddown(group_offset, epb);
808 kunmap(bitmap_bh->b_page);
809 mark_buffer_dirty(bitmap_bh);
812 for (k = 0; k < nempties; k++) {
813 ret = nilfs_palloc_delete_entry_block(inode,
815 if (ret && ret != -ENOENT) {
816 nilfs_warning(inode->i_sb, __func__,
817 "failed to delete block of entry %llu: ino=%lu, err=%d\n",
818 (unsigned long long)last_nrs[k],
819 (unsigned long)inode->i_ino, ret);
823 desc_kaddr = kmap_atomic(desc_bh->b_page);
824 desc = nilfs_palloc_block_get_group_desc(
825 inode, group, desc_bh, desc_kaddr);
826 nfree = nilfs_palloc_group_desc_add_entries(desc, lock, n);
827 kunmap_atomic(desc_kaddr);
828 mark_buffer_dirty(desc_bh);
829 nilfs_mdt_mark_dirty(inode);
832 if (nfree == nilfs_palloc_entries_per_group(inode)) {
833 ret = nilfs_palloc_delete_bitmap_block(inode, group);
834 if (ret && ret != -ENOENT) {
835 nilfs_warning(inode->i_sb, __func__,
836 "failed to delete bitmap block of group %lu: ino=%lu, err=%d\n",
838 (unsigned long)inode->i_ino, ret);
845 void nilfs_palloc_setup_cache(struct inode *inode,
846 struct nilfs_palloc_cache *cache)
848 NILFS_MDT(inode)->mi_palloc_cache = cache;
849 spin_lock_init(&cache->lock);
852 void nilfs_palloc_clear_cache(struct inode *inode)
854 struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
856 spin_lock(&cache->lock);
857 brelse(cache->prev_desc.bh);
858 brelse(cache->prev_bitmap.bh);
859 brelse(cache->prev_entry.bh);
860 cache->prev_desc.bh = NULL;
861 cache->prev_bitmap.bh = NULL;
862 cache->prev_entry.bh = NULL;
863 spin_unlock(&cache->lock);
866 void nilfs_palloc_destroy_cache(struct inode *inode)
868 nilfs_palloc_clear_cache(inode);
869 NILFS_MDT(inode)->mi_palloc_cache = NULL;