| Koji Sato | 36a580e | 2009-04-06 19:01:25 -0700 | [diff] [blame] | 1 | /* |
| 2 | * direct.h - NILFS direct block pointer. |
| 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 | * Written by Koji Sato <koji@osrg.net>. |
| 21 | */ |
| 22 | |
| 23 | #ifndef _NILFS_DIRECT_H |
| 24 | #define _NILFS_DIRECT_H |
| 25 | |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/buffer_head.h> |
| 28 | #include "bmap.h" |
| 29 | |
| 30 | |
| 31 | struct nilfs_direct; |
| 32 | |
| 33 | /** |
| 34 | * struct nilfs_direct_operations - direct mapping operation table |
| 35 | */ |
| 36 | struct nilfs_direct_operations { |
| 37 | __u64 (*dop_find_target)(const struct nilfs_direct *, __u64); |
| 38 | void (*dop_set_target)(struct nilfs_direct *, __u64, __u64); |
| 39 | int (*dop_propagate)(struct nilfs_direct *, struct buffer_head *); |
| 40 | int (*dop_assign)(struct nilfs_direct *, __u64, __u64, |
| 41 | struct buffer_head **, sector_t, |
| 42 | union nilfs_binfo *); |
| 43 | }; |
| 44 | |
| 45 | /** |
| 46 | * struct nilfs_direct_node - direct node |
| 47 | * @dn_flags: flags |
| 48 | * @dn_pad: padding |
| 49 | */ |
| 50 | struct nilfs_direct_node { |
| 51 | __u8 dn_flags; |
| 52 | __u8 pad[7]; |
| 53 | }; |
| 54 | |
| 55 | /** |
| 56 | * struct nilfs_direct - direct mapping |
| 57 | * @d_bmap: bmap structure |
| 58 | * @d_ops: direct mapping operation table |
| 59 | */ |
| 60 | struct nilfs_direct { |
| 61 | struct nilfs_bmap d_bmap; |
| 62 | |
| 63 | /* direct-mapping-specific members */ |
| 64 | const struct nilfs_direct_operations *d_ops; |
| 65 | }; |
| 66 | |
| 67 | |
| 68 | #define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1) |
| 69 | #define NILFS_DIRECT_KEY_MIN 0 |
| 70 | #define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1) |
| 71 | |
| 72 | |
| 73 | int nilfs_direct_init(struct nilfs_bmap *, __u64, __u64); |
| 74 | int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *, |
| 75 | __u64 *, int, __u64, __u64); |
| 76 | |
| 77 | |
| 78 | #endif /* _NILFS_DIRECT_H */ |