1 /* SPDX-License-Identifier: GPL-2.0+ */ <<
2 /* 1 /*
3 * Persistent object (dat entry/disk inode) al !! 2 * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator
4 * 3 *
5 * Copyright (C) 2006-2008 Nippon Telegraph an 4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 * 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 *
7 * Originally written by Koji Sato. 16 * Originally written by Koji Sato.
8 * Two allocators were unified by Ryusuke Koni 17 * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji.
9 */ 18 */
10 19
11 #ifndef _NILFS_ALLOC_H 20 #ifndef _NILFS_ALLOC_H
12 #define _NILFS_ALLOC_H 21 #define _NILFS_ALLOC_H
13 22
14 #include <linux/types.h> 23 #include <linux/types.h>
15 #include <linux/buffer_head.h> 24 #include <linux/buffer_head.h>
16 #include <linux/fs.h> 25 #include <linux/fs.h>
17 26
18 /** 27 /**
19 * nilfs_palloc_entries_per_group - get the nu 28 * nilfs_palloc_entries_per_group - get the number of entries per group
20 * @inode: inode of metadata file using this a 29 * @inode: inode of metadata file using this allocator
21 * 30 *
22 * The number of entries per group is defined 31 * The number of entries per group is defined by the number of bits
23 * that a bitmap block can maintain. 32 * that a bitmap block can maintain.
24 */ 33 */
25 static inline unsigned long 34 static inline unsigned long
26 nilfs_palloc_entries_per_group(const struct in 35 nilfs_palloc_entries_per_group(const struct inode *inode)
27 { 36 {
28 return 1UL << (inode->i_blkbits + 3 /* 37 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
29 } 38 }
30 39
31 int nilfs_palloc_init_blockgroup(struct inode 40 int nilfs_palloc_init_blockgroup(struct inode *, unsigned int);
32 int nilfs_palloc_get_entry_block(struct inode 41 int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
33 struct buffer 42 struct buffer_head **);
34 void *nilfs_palloc_block_get_entry(const struc 43 void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
35 const struc 44 const struct buffer_head *, void *);
36 45
37 int nilfs_palloc_count_max_entries(struct inod 46 int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);
38 47
39 /** 48 /**
40 * struct nilfs_palloc_req - persistent alloca !! 49 * nilfs_palloc_req - persistent allocator request and reply
41 * @pr_entry_nr: entry number (vblocknr or ino 50 * @pr_entry_nr: entry number (vblocknr or inode number)
42 * @pr_desc_bh: buffer head of the buffer cont 51 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
43 * @pr_bitmap_bh: buffer head of the buffer co 52 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
44 * @pr_entry_bh: buffer head of the buffer con 53 * @pr_entry_bh: buffer head of the buffer containing translation entries
45 */ 54 */
46 struct nilfs_palloc_req { 55 struct nilfs_palloc_req {
47 __u64 pr_entry_nr; 56 __u64 pr_entry_nr;
48 struct buffer_head *pr_desc_bh; 57 struct buffer_head *pr_desc_bh;
49 struct buffer_head *pr_bitmap_bh; 58 struct buffer_head *pr_bitmap_bh;
50 struct buffer_head *pr_entry_bh; 59 struct buffer_head *pr_entry_bh;
51 }; 60 };
52 61
53 int nilfs_palloc_prepare_alloc_entry(struct in !! 62 int nilfs_palloc_prepare_alloc_entry(struct inode *,
54 struct ni !! 63 struct nilfs_palloc_req *);
55 void nilfs_palloc_commit_alloc_entry(struct in 64 void nilfs_palloc_commit_alloc_entry(struct inode *,
56 struct ni 65 struct nilfs_palloc_req *);
57 void nilfs_palloc_abort_alloc_entry(struct ino 66 void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
58 void nilfs_palloc_commit_free_entry(struct ino 67 void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
59 int nilfs_palloc_prepare_free_entry(struct ino 68 int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
60 void nilfs_palloc_abort_free_entry(struct inod 69 void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
61 int nilfs_palloc_freev(struct inode *, __u64 * 70 int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
62 71
63 #define nilfs_set_bit_atomic ext2_s 72 #define nilfs_set_bit_atomic ext2_set_bit_atomic
64 #define nilfs_clear_bit_atomic ext2_c 73 #define nilfs_clear_bit_atomic ext2_clear_bit_atomic
65 #define nilfs_find_next_zero_bit find_n 74 #define nilfs_find_next_zero_bit find_next_zero_bit_le
66 #define nilfs_find_next_bit find_n 75 #define nilfs_find_next_bit find_next_bit_le
67 76
68 /** 77 /**
69 * struct nilfs_bh_assoc - block offset and bu 78 * struct nilfs_bh_assoc - block offset and buffer head association
70 * @blkoff: block offset 79 * @blkoff: block offset
71 * @bh: buffer head 80 * @bh: buffer head
72 */ 81 */
73 struct nilfs_bh_assoc { 82 struct nilfs_bh_assoc {
74 unsigned long blkoff; 83 unsigned long blkoff;
75 struct buffer_head *bh; 84 struct buffer_head *bh;
76 }; 85 };
77 86
78 /** 87 /**
79 * struct nilfs_palloc_cache - persistent obje 88 * struct nilfs_palloc_cache - persistent object allocator cache
80 * @lock: cache protecting lock 89 * @lock: cache protecting lock
81 * @prev_desc: blockgroup descriptors cache 90 * @prev_desc: blockgroup descriptors cache
82 * @prev_bitmap: blockgroup bitmap cache 91 * @prev_bitmap: blockgroup bitmap cache
83 * @prev_entry: translation entries cache 92 * @prev_entry: translation entries cache
84 */ 93 */
85 struct nilfs_palloc_cache { 94 struct nilfs_palloc_cache {
86 spinlock_t lock; 95 spinlock_t lock;
87 struct nilfs_bh_assoc prev_desc; 96 struct nilfs_bh_assoc prev_desc;
88 struct nilfs_bh_assoc prev_bitmap; 97 struct nilfs_bh_assoc prev_bitmap;
89 struct nilfs_bh_assoc prev_entry; 98 struct nilfs_bh_assoc prev_entry;
90 }; 99 };
91 100
92 void nilfs_palloc_setup_cache(struct inode *in 101 void nilfs_palloc_setup_cache(struct inode *inode,
93 struct nilfs_pal 102 struct nilfs_palloc_cache *cache);
94 void nilfs_palloc_clear_cache(struct inode *in 103 void nilfs_palloc_clear_cache(struct inode *inode);
95 void nilfs_palloc_destroy_cache(struct inode * 104 void nilfs_palloc_destroy_cache(struct inode *inode);
96 105
97 #endif /* _NILFS_ALLOC_H */ 106 #endif /* _NILFS_ALLOC_H */
98 107
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