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 *
7 * Originally written by Koji Sato. !! 6 * This program is free software; you can redistribute it and/or modify
8 * Two allocators were unified by Ryusuke Koni !! 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>.
9 */ 23 */
10 24
11 #ifndef _NILFS_ALLOC_H 25 #ifndef _NILFS_ALLOC_H
12 #define _NILFS_ALLOC_H 26 #define _NILFS_ALLOC_H
13 27
14 #include <linux/types.h> 28 #include <linux/types.h>
15 #include <linux/buffer_head.h> 29 #include <linux/buffer_head.h>
16 #include <linux/fs.h> 30 #include <linux/fs.h>
17 31
18 /** 32 /**
19 * nilfs_palloc_entries_per_group - get the nu 33 * nilfs_palloc_entries_per_group - get the number of entries per group
20 * @inode: inode of metadata file using this a 34 * @inode: inode of metadata file using this allocator
21 * 35 *
22 * The number of entries per group is defined 36 * The number of entries per group is defined by the number of bits
23 * that a bitmap block can maintain. 37 * that a bitmap block can maintain.
24 */ 38 */
25 static inline unsigned long 39 static inline unsigned long
26 nilfs_palloc_entries_per_group(const struct in 40 nilfs_palloc_entries_per_group(const struct inode *inode)
27 { 41 {
28 return 1UL << (inode->i_blkbits + 3 /* 42 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
29 } 43 }
30 44
31 int nilfs_palloc_init_blockgroup(struct inode !! 45 int nilfs_palloc_init_blockgroup(struct inode *, unsigned);
32 int nilfs_palloc_get_entry_block(struct inode 46 int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
33 struct buffer 47 struct buffer_head **);
34 void *nilfs_palloc_block_get_entry(const struc 48 void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
35 const struc 49 const struct buffer_head *, void *);
36 50
37 int nilfs_palloc_count_max_entries(struct inod 51 int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *);
38 52
39 /** 53 /**
40 * struct nilfs_palloc_req - persistent alloca !! 54 * nilfs_palloc_req - persistent allocator request and reply
41 * @pr_entry_nr: entry number (vblocknr or ino 55 * @pr_entry_nr: entry number (vblocknr or inode number)
42 * @pr_desc_bh: buffer head of the buffer cont 56 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
43 * @pr_bitmap_bh: buffer head of the buffer co 57 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
44 * @pr_entry_bh: buffer head of the buffer con 58 * @pr_entry_bh: buffer head of the buffer containing translation entries
45 */ 59 */
46 struct nilfs_palloc_req { 60 struct nilfs_palloc_req {
47 __u64 pr_entry_nr; 61 __u64 pr_entry_nr;
48 struct buffer_head *pr_desc_bh; 62 struct buffer_head *pr_desc_bh;
49 struct buffer_head *pr_bitmap_bh; 63 struct buffer_head *pr_bitmap_bh;
50 struct buffer_head *pr_entry_bh; 64 struct buffer_head *pr_entry_bh;
51 }; 65 };
52 66
53 int nilfs_palloc_prepare_alloc_entry(struct in !! 67 int nilfs_palloc_prepare_alloc_entry(struct inode *,
54 struct ni !! 68 struct nilfs_palloc_req *);
55 void nilfs_palloc_commit_alloc_entry(struct in 69 void nilfs_palloc_commit_alloc_entry(struct inode *,
56 struct ni 70 struct nilfs_palloc_req *);
57 void nilfs_palloc_abort_alloc_entry(struct ino 71 void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
58 void nilfs_palloc_commit_free_entry(struct ino 72 void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
59 int nilfs_palloc_prepare_free_entry(struct ino 73 int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
60 void nilfs_palloc_abort_free_entry(struct inod 74 void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
61 int nilfs_palloc_freev(struct inode *, __u64 * 75 int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
62 76
63 #define nilfs_set_bit_atomic ext2_s 77 #define nilfs_set_bit_atomic ext2_set_bit_atomic
64 #define nilfs_clear_bit_atomic ext2_c 78 #define nilfs_clear_bit_atomic ext2_clear_bit_atomic
65 #define nilfs_find_next_zero_bit find_n 79 #define nilfs_find_next_zero_bit find_next_zero_bit_le
66 #define nilfs_find_next_bit find_n 80 #define nilfs_find_next_bit find_next_bit_le
67 81
68 /** 82 /**
69 * struct nilfs_bh_assoc - block offset and bu 83 * struct nilfs_bh_assoc - block offset and buffer head association
70 * @blkoff: block offset 84 * @blkoff: block offset
71 * @bh: buffer head 85 * @bh: buffer head
72 */ 86 */
73 struct nilfs_bh_assoc { 87 struct nilfs_bh_assoc {
74 unsigned long blkoff; 88 unsigned long blkoff;
75 struct buffer_head *bh; 89 struct buffer_head *bh;
76 }; 90 };
77 91
78 /** 92 /**
79 * struct nilfs_palloc_cache - persistent obje 93 * struct nilfs_palloc_cache - persistent object allocator cache
80 * @lock: cache protecting lock 94 * @lock: cache protecting lock
81 * @prev_desc: blockgroup descriptors cache 95 * @prev_desc: blockgroup descriptors cache
82 * @prev_bitmap: blockgroup bitmap cache 96 * @prev_bitmap: blockgroup bitmap cache
83 * @prev_entry: translation entries cache 97 * @prev_entry: translation entries cache
84 */ 98 */
85 struct nilfs_palloc_cache { 99 struct nilfs_palloc_cache {
86 spinlock_t lock; 100 spinlock_t lock;
87 struct nilfs_bh_assoc prev_desc; 101 struct nilfs_bh_assoc prev_desc;
88 struct nilfs_bh_assoc prev_bitmap; 102 struct nilfs_bh_assoc prev_bitmap;
89 struct nilfs_bh_assoc prev_entry; 103 struct nilfs_bh_assoc prev_entry;
90 }; 104 };
91 105
92 void nilfs_palloc_setup_cache(struct inode *in 106 void nilfs_palloc_setup_cache(struct inode *inode,
93 struct nilfs_pal 107 struct nilfs_palloc_cache *cache);
94 void nilfs_palloc_clear_cache(struct inode *in 108 void nilfs_palloc_clear_cache(struct inode *inode);
95 void nilfs_palloc_destroy_cache(struct inode * 109 void nilfs_palloc_destroy_cache(struct inode *inode);
96 110
97 #endif /* _NILFS_ALLOC_H */ 111 #endif /* _NILFS_ALLOC_H */
98 112
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