2 * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
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
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>.
25 #ifndef _NILFS_ALLOC_H
26 #define _NILFS_ALLOC_H
28 #include <linux/types.h>
29 #include <linux/buffer_head.h>
32 static inline unsigned long
33 nilfs_palloc_entries_per_group(const struct inode *inode)
35 return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
38 int nilfs_palloc_init_blockgroup(struct inode *, unsigned);
39 int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
40 struct buffer_head **);
41 void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
42 const struct buffer_head *, void *);
45 * nilfs_palloc_req - persistent alloctor request and reply
46 * @pr_entry_nr: entry number (vblocknr or inode number)
47 * @pr_desc_bh: buffer head of the buffer containing block group descriptors
48 * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
49 * @pr_entry_bh: buffer head of the buffer containing translation entries
51 struct nilfs_palloc_req {
53 struct buffer_head *pr_desc_bh;
54 struct buffer_head *pr_bitmap_bh;
55 struct buffer_head *pr_entry_bh;
58 int nilfs_palloc_prepare_alloc_entry(struct inode *,
59 struct nilfs_palloc_req *);
60 void nilfs_palloc_commit_alloc_entry(struct inode *,
61 struct nilfs_palloc_req *);
62 void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
63 void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
64 int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
65 void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
66 int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
68 #define nilfs_set_bit_atomic ext2_set_bit_atomic
69 #define nilfs_clear_bit_atomic ext2_clear_bit_atomic
70 #define nilfs_find_next_zero_bit ext2_find_next_zero_bit
72 #endif /* _NILFS_ALLOC_H */