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Diffstat (limited to 'kernel/fs/nilfs2/alloc.h')
| -rw-r--r-- | kernel/fs/nilfs2/alloc.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/kernel/fs/nilfs2/alloc.h b/kernel/fs/nilfs2/alloc.h new file mode 100644 index 000000000..4bd6451b5 --- /dev/null +++ b/kernel/fs/nilfs2/alloc.h @@ -0,0 +1,110 @@ +/* + * 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> + +/** + * nilfs_palloc_entries_per_group - get the number of entries per group + * @inode: inode of metadata file using this allocator + * + * The number of entries per group is defined by the number of bits + * that a bitmap block can maintain. + */ +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 *); + +int nilfs_palloc_count_max_entries(struct inode *, u64, u64 *); + +/** + * nilfs_palloc_req - persistent allocator 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 find_next_zero_bit_le + +/** + * struct nilfs_bh_assoc - block offset and buffer head association + * @blkoff: block offset + * @bh: buffer head + */ +struct nilfs_bh_assoc { + unsigned long blkoff; + struct buffer_head *bh; +}; + +/** + * struct nilfs_palloc_cache - persistent object allocator cache + * @lock: cache protecting lock + * @prev_desc: blockgroup descriptors cache + * @prev_bitmap: blockgroup bitmap cache + * @prev_entry: translation entries cache + */ +struct nilfs_palloc_cache { + spinlock_t lock; + struct nilfs_bh_assoc prev_desc; + struct nilfs_bh_assoc prev_bitmap; + struct nilfs_bh_assoc prev_entry; +}; + +void nilfs_palloc_setup_cache(struct inode *inode, + struct nilfs_palloc_cache *cache); +void nilfs_palloc_clear_cache(struct inode *inode); +void nilfs_palloc_destroy_cache(struct inode *inode); + +#endif /* _NILFS_ALLOC_H */ |