diff options
author | Paul Mackerras <paulus@samba.org> | 2009-04-22 13:02:09 +1000 |
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committer | Paul Mackerras <paulus@samba.org> | 2009-04-22 13:02:09 +1000 |
commit | 5bd3ef84d73c2ea7b4babbad060909753c4828d4 (patch) | |
tree | fdf2bafb48ae1ed03175f6c77a7548a181e69ee9 /fs/nilfs2/alloc.h | |
parent | 0658c16056660886ea2f35c4f038be70a94b1532 (diff) | |
parent | 6d25b688ecc488753af3c9e6f6a9a575b863cf37 (diff) |
Merge branch 'merge' of git://git.secretlab.ca/git/linux-2.6 into merge
Diffstat (limited to 'fs/nilfs2/alloc.h')
-rw-r--r-- | fs/nilfs2/alloc.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/fs/nilfs2/alloc.h b/fs/nilfs2/alloc.h new file mode 100644 index 000000000000..4ace5475c2c7 --- /dev/null +++ b/fs/nilfs2/alloc.h @@ -0,0 +1,72 @@ +/* + * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator + * + * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Original code was written by Koji Sato <koji@osrg.net>. + * Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>, + * Amagai Yoshiji <amagai@osrg.net>. + */ + +#ifndef _NILFS_ALLOC_H +#define _NILFS_ALLOC_H + +#include <linux/types.h> +#include <linux/buffer_head.h> +#include <linux/fs.h> + +static inline unsigned long +nilfs_palloc_entries_per_group(const struct inode *inode) +{ + return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */); +} + +int nilfs_palloc_init_blockgroup(struct inode *, unsigned); +int nilfs_palloc_get_entry_block(struct inode *, __u64, int, + struct buffer_head **); +void *nilfs_palloc_block_get_entry(const struct inode *, __u64, + const struct buffer_head *, void *); + +/** + * nilfs_palloc_req - persistent alloctor request and reply + * @pr_entry_nr: entry number (vblocknr or inode number) + * @pr_desc_bh: buffer head of the buffer containing block group descriptors + * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap + * @pr_entry_bh: buffer head of the buffer containing translation entries + */ +struct nilfs_palloc_req { + __u64 pr_entry_nr; + struct buffer_head *pr_desc_bh; + struct buffer_head *pr_bitmap_bh; + struct buffer_head *pr_entry_bh; +}; + +int nilfs_palloc_prepare_alloc_entry(struct inode *, + struct nilfs_palloc_req *); +void nilfs_palloc_commit_alloc_entry(struct inode *, + struct nilfs_palloc_req *); +void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *); +void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *); +int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *); +void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *); +int nilfs_palloc_freev(struct inode *, __u64 *, size_t); + +#define nilfs_set_bit_atomic ext2_set_bit_atomic +#define nilfs_clear_bit_atomic ext2_clear_bit_atomic +#define nilfs_find_next_zero_bit ext2_find_next_zero_bit + +#endif /* _NILFS_ALLOC_H */ |