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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 * Originally written by Koji Sato.
17 * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
18 */
19
20 #ifndef _NILFS_ALLOC_H
21 #define _NILFS_ALLOC_H
22
23 #include <linux/types.h>
24 #include <linux/buffer_head.h>
25 #include <linux/fs.h>
26
27 /**
28 * nilfs_palloc_entries_per_group - get the number of entries per group
29 * @inode: inode of metadata file using this allocator
30 *
31 * The number of entries per group is defined by the number of bits
32 * that a bitmap block can maintain.
33 */
34 static inline unsigned long
35 nilfs_palloc_entries_per_group(const struct inode *inode)
36 {
37 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
38 }
39
40 int nilfs_palloc_init_blockgroup(struct inode *, unsigned int);
41 int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
42 struct buffer_head **);
43 void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
44 const struct buffer_head *, void *);
45
46 int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);
47
48 /**
49 * nilfs_palloc_req - persistent allocator request and reply
50 * @pr_entry_nr: entry number (vblocknr or inode number)
51 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
52 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
53 * @pr_entry_bh: buffer head of the buffer containing translation entries
54 */
55 struct nilfs_palloc_req {
56 __u64 pr_entry_nr;
57 struct buffer_head *pr_desc_bh;
58 struct buffer_head *pr_bitmap_bh;
59 struct buffer_head *pr_entry_bh;
60 };
61
62 int nilfs_palloc_prepare_alloc_entry(struct inode *,
63 struct nilfs_palloc_req *);
64 void nilfs_palloc_commit_alloc_entry(struct inode *,
65 struct nilfs_palloc_req *);
66 void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
67 void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
68 int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
69 void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
70 int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
71
72 #define nilfs_set_bit_atomic ext2_set_bit_atomic
73 #define nilfs_clear_bit_atomic ext2_clear_bit_atomic
74 #define nilfs_find_next_zero_bit find_next_zero_bit_le
75 #define nilfs_find_next_bit find_next_bit_le
76
77 /**
78 * struct nilfs_bh_assoc - block offset and buffer head association
79 * @blkoff: block offset
80 * @bh: buffer head
81 */
82 struct nilfs_bh_assoc {
83 unsigned long blkoff;
84 struct buffer_head *bh;
85 };
86
87 /**
88 * struct nilfs_palloc_cache - persistent object allocator cache
89 * @lock: cache protecting lock
90 * @prev_desc: blockgroup descriptors cache
91 * @prev_bitmap: blockgroup bitmap cache
92 * @prev_entry: translation entries cache
93 */
94 struct nilfs_palloc_cache {
95 spinlock_t lock;
96 struct nilfs_bh_assoc prev_desc;
97 struct nilfs_bh_assoc prev_bitmap;
98 struct nilfs_bh_assoc prev_entry;
99 };
100
101 void nilfs_palloc_setup_cache(struct inode *inode,
102 struct nilfs_palloc_cache *cache);
103 void nilfs_palloc_clear_cache(struct inode *inode);
104 void nilfs_palloc_destroy_cache(struct inode *inode);
105
106 #endif /* _NILFS_ALLOC_H */