projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 17c76b01 KS |
1 | /* |
| 2 | * btree.h - NILFS B-tree. | |
| 3 | * | |
| 4 | * Copyright (C) 2005-2008 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 | * Written by Koji Sato <[email protected]>. | |
| 21 | */ | |
| 22 | ||
| 23 | #ifndef _NILFS_BTREE_H | |
| 24 | #define _NILFS_BTREE_H | |
| 25 | ||
| 26 | #include <linux/types.h> | |
| 27 | #include <linux/buffer_head.h> | |
| 28 | #include <linux/list.h> | |
| 29 | #include <linux/nilfs2_fs.h> | |
| 30 | #include "btnode.h" | |
| 31 | #include "bmap.h" | |
| 32 | ||
| 33 | struct nilfs_btree; | |
| 34 | struct nilfs_btree_path; | |
| 35 | ||
| 17c76b01 KS |
36 | /** |
| 37 | * struct nilfs_btree_node - B-tree node | |
| 38 | * @bn_flags: flags | |
| 39 | * @bn_level: level | |
| 40 | * @bn_nchildren: number of children | |
| 41 | * @bn_pad: padding | |
| 42 | */ | |
| 43 | struct nilfs_btree_node { | |
| 44 | __u8 bn_flags; | |
| 45 | __u8 bn_level; | |
| 46 | __le16 bn_nchildren; | |
| 47 | __le32 bn_pad; | |
| 48 | }; | |
| 49 | ||
| 50 | /* flags */ | |
| 51 | #define NILFS_BTREE_NODE_ROOT 0x01 | |
| 52 | ||
| 53 | /* level */ | |
| 54 | #define NILFS_BTREE_LEVEL_DATA 0 | |
| 55 | #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1) | |
| 56 | #define NILFS_BTREE_LEVEL_MAX 14 | |
| 57 | ||
| 58 | /** | |
| 59 | * struct nilfs_btree - B-tree structure | |
| 60 | * @bt_bmap: bmap base structure | |
| 17c76b01 KS |
61 | */ |
| 62 | struct nilfs_btree { | |
| 63 | struct nilfs_bmap bt_bmap; | |
| 17c76b01 KS |
64 | }; |
| 65 | ||
| 66 | ||
| 67 | #define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE | |
| 68 | #define NILFS_BTREE_ROOT_NCHILDREN_MAX \ | |
| 69 | ((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) / \ | |
| 70 | (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */))) | |
| 71 | #define NILFS_BTREE_ROOT_NCHILDREN_MIN 0 | |
| 72 | #define NILFS_BTREE_NODE_EXTRA_PAD_SIZE (sizeof(__le64)) | |
| 73 | #define NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) \ | |
| 74 | (((nodesize) - sizeof(struct nilfs_btree_node) - \ | |
| 75 | NILFS_BTREE_NODE_EXTRA_PAD_SIZE) / \ | |
| 76 | (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */))) | |
| 77 | #define NILFS_BTREE_NODE_NCHILDREN_MIN(nodesize) \ | |
| 78 | ((NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) - 1) / 2 + 1) | |
| 79 | #define NILFS_BTREE_KEY_MIN ((__u64)0) | |
| 80 | #define NILFS_BTREE_KEY_MAX (~(__u64)0) | |
| 81 | ||
| 82 | ||
| 83 | int nilfs_btree_path_cache_init(void); | |
| 84 | void nilfs_btree_path_cache_destroy(void); | |
| 3033342a | 85 | int nilfs_btree_init(struct nilfs_bmap *); |
| 17c76b01 | 86 | int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64, |
| 3033342a | 87 | const __u64 *, const __u64 *, int); |
| 17c76b01 KS |
88 | void nilfs_btree_init_gc(struct nilfs_bmap *); |
| 89 | ||
| 90 | #endif /* _NILFS_BTREE_H */ |