projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 5442680f RK |
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 | ||
| db55d922 RK |
32 | /** |
| 33 | * nilfs_palloc_entries_per_group - get the number of entries per group | |
| 34 | * @inode: inode of metadata file using this allocator | |
| 35 | * | |
| 36 | * The number of entries per group is defined by the number of bits | |
| 37 | * that a bitmap block can maintain. | |
| 38 | */ | |
| 5442680f RK |
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 | ||
| 51 | /** | |
| 7a65004b | 52 | * nilfs_palloc_req - persistent allocator request and reply |
| 5442680f RK |
53 | * @pr_entry_nr: entry number (vblocknr or inode number) |
| 54 | * @pr_desc_bh: buffer head of the buffer containing block group descriptors | |
| 55 | * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap | |
| 56 | * @pr_entry_bh: buffer head of the buffer containing translation entries | |
| 57 | */ | |
| 58 | struct nilfs_palloc_req { | |
| 59 | __u64 pr_entry_nr; | |
| 60 | struct buffer_head *pr_desc_bh; | |
| 61 | struct buffer_head *pr_bitmap_bh; | |
| 62 | struct buffer_head *pr_entry_bh; | |
| 63 | }; | |
| 64 | ||
| 65 | int nilfs_palloc_prepare_alloc_entry(struct inode *, | |
| 66 | struct nilfs_palloc_req *); | |
| 67 | void nilfs_palloc_commit_alloc_entry(struct inode *, | |
| 68 | struct nilfs_palloc_req *); | |
| 69 | void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *); | |
| 70 | void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *); | |
| 71 | int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *); | |
| 72 | void nilfs_palloc_abort_free_entry(struct inode *, 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 | |
| a49ebbab | 77 | #define nilfs_find_next_zero_bit find_next_zero_bit_le |
| 5442680f | 78 | |
| db38d5ad RK |
79 | /* |
| 80 | * persistent object allocator cache | |
| 81 | */ | |
| 82 | ||
| 83 | struct nilfs_bh_assoc { | |
| 84 | unsigned long blkoff; | |
| 85 | struct buffer_head *bh; | |
| 86 | }; | |
| 87 | ||
| 88 | struct nilfs_palloc_cache { | |
| 89 | spinlock_t lock; | |
| 90 | struct nilfs_bh_assoc prev_desc; | |
| 91 | struct nilfs_bh_assoc prev_bitmap; | |
| 92 | struct nilfs_bh_assoc prev_entry; | |
| 93 | }; | |
| 94 | ||
| 95 | void nilfs_palloc_setup_cache(struct inode *inode, | |
| 96 | struct nilfs_palloc_cache *cache); | |
| 97 | void nilfs_palloc_clear_cache(struct inode *inode); | |
| 98 | void nilfs_palloc_destroy_cache(struct inode *inode); | |
| 99 | ||
| 5442680f | 100 | #endif /* _NILFS_ALLOC_H */ |