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alloc.h
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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  * 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 <[email protected]>.
21  * Two allocators were unified by Ryusuke Konishi <[email protected]>,
22  * Amagai Yoshiji <[email protected]>.
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 
39 static inline unsigned long
40 nilfs_palloc_entries_per_group(const struct inode *inode)
41 {
42  return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
43 }
44 
45 int nilfs_palloc_init_blockgroup(struct inode *, unsigned);
46 int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
47  struct buffer_head **);
48 void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
49  const struct buffer_head *, void *);
50 
60  struct buffer_head *pr_desc_bh;
61  struct buffer_head *pr_bitmap_bh;
62  struct buffer_head *pr_entry_bh;
63 };
64 
66  struct nilfs_palloc_req *);
68  struct nilfs_palloc_req *);
73 int 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 
85  unsigned long blkoff;
86  struct buffer_head *bh;
87 };
88 
101 };
102 
104  struct nilfs_palloc_cache *cache);
105 void nilfs_palloc_clear_cache(struct inode *inode);
107 
108 #endif /* _NILFS_ALLOC_H */