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1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Persistent object (dat entry/disk inode) allocator/deallocator
4 *
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Originally written by Koji Sato.
8 * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
9 */
10
11#ifndef _NILFS_ALLOC_H
12#define _NILFS_ALLOC_H
13
14#include <linux/types.h>
15#include <linux/buffer_head.h>
16#include <linux/fs.h>
17
18/**
19 * nilfs_palloc_entries_per_group - get the number of entries per group
20 * @inode: inode of metadata file using this allocator
21 *
22 * The number of entries per group is defined by the number of bits
23 * that a bitmap block can maintain.
24 */
25static inline unsigned long
26nilfs_palloc_entries_per_group(const struct inode *inode)
27{
28 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
29}
30
31int nilfs_palloc_init_blockgroup(struct inode *, unsigned int);
32int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
33 struct buffer_head **);
34void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
35 const struct buffer_head *, void *);
36
37int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);
38
39/**
40 * nilfs_palloc_req - persistent allocator request and reply
41 * @pr_entry_nr: entry number (vblocknr or inode number)
42 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
43 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
44 * @pr_entry_bh: buffer head of the buffer containing translation entries
45 */
46struct nilfs_palloc_req {
47 __u64 pr_entry_nr;
48 struct buffer_head *pr_desc_bh;
49 struct buffer_head *pr_bitmap_bh;
50 struct buffer_head *pr_entry_bh;
51};
52
53int nilfs_palloc_prepare_alloc_entry(struct inode *,
54 struct nilfs_palloc_req *);
55void nilfs_palloc_commit_alloc_entry(struct inode *,
56 struct nilfs_palloc_req *);
57void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
58void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
59int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
60void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
61int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
62
63#define nilfs_set_bit_atomic ext2_set_bit_atomic
64#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
65#define nilfs_find_next_zero_bit find_next_zero_bit_le
66#define nilfs_find_next_bit find_next_bit_le
67
68/**
69 * struct nilfs_bh_assoc - block offset and buffer head association
70 * @blkoff: block offset
71 * @bh: buffer head
72 */
73struct nilfs_bh_assoc {
74 unsigned long blkoff;
75 struct buffer_head *bh;
76};
77
78/**
79 * struct nilfs_palloc_cache - persistent object allocator cache
80 * @lock: cache protecting lock
81 * @prev_desc: blockgroup descriptors cache
82 * @prev_bitmap: blockgroup bitmap cache
83 * @prev_entry: translation entries cache
84 */
85struct nilfs_palloc_cache {
86 spinlock_t lock;
87 struct nilfs_bh_assoc prev_desc;
88 struct nilfs_bh_assoc prev_bitmap;
89 struct nilfs_bh_assoc prev_entry;
90};
91
92void nilfs_palloc_setup_cache(struct inode *inode,
93 struct nilfs_palloc_cache *cache);
94void nilfs_palloc_clear_cache(struct inode *inode);
95void nilfs_palloc_destroy_cache(struct inode *inode);
96
97#endif /* _NILFS_ALLOC_H */
1/*
2 * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator
3 *
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
5 *
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.
10 *
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.
15 *
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
19 *
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>.
23 */
24
25#ifndef _NILFS_ALLOC_H
26#define _NILFS_ALLOC_H
27
28#include <linux/types.h>
29#include <linux/buffer_head.h>
30#include <linux/fs.h>
31
32/**
33 * nilfs_palloc_entries_per_group - get the number of entries per group
34 * @inode: inode of metadata file using this allocator
35 *
36 * The number of entries per group is defined by the number of bits
37 * that a bitmap block can maintain.
38 */
39static inline unsigned long
40nilfs_palloc_entries_per_group(const struct inode *inode)
41{
42 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
43}
44
45int nilfs_palloc_init_blockgroup(struct inode *, unsigned);
46int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
47 struct buffer_head **);
48void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
49 const struct buffer_head *, void *);
50
51/**
52 * nilfs_palloc_req - persistent allocator request and reply
53 * @pr_entry_nr: entry number (vblocknr or inode number)
54 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
55 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
56 * @pr_entry_bh: buffer head of the buffer containing translation entries
57 */
58struct nilfs_palloc_req {
59 __u64 pr_entry_nr;
60 struct buffer_head *pr_desc_bh;
61 struct buffer_head *pr_bitmap_bh;
62 struct buffer_head *pr_entry_bh;
63};
64
65int nilfs_palloc_prepare_alloc_entry(struct inode *,
66 struct nilfs_palloc_req *);
67void nilfs_palloc_commit_alloc_entry(struct inode *,
68 struct nilfs_palloc_req *);
69void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
70void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
71int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
72void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
73int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
74
75#define nilfs_set_bit_atomic ext2_set_bit_atomic
76#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
77#define nilfs_find_next_zero_bit find_next_zero_bit_le
78
79/*
80 * persistent object allocator cache
81 */
82
83struct nilfs_bh_assoc {
84 unsigned long blkoff;
85 struct buffer_head *bh;
86};
87
88struct nilfs_palloc_cache {
89 spinlock_t lock;
90 struct nilfs_bh_assoc prev_desc;
91 struct nilfs_bh_assoc prev_bitmap;
92 struct nilfs_bh_assoc prev_entry;
93};
94
95void nilfs_palloc_setup_cache(struct inode *inode,
96 struct nilfs_palloc_cache *cache);
97void nilfs_palloc_clear_cache(struct inode *inode);
98void nilfs_palloc_destroy_cache(struct inode *inode);
99
100#endif /* _NILFS_ALLOC_H */