mirror of
https://github.com/adulau/aha.git
synced 2024-12-29 12:16:20 +00:00
36a580eb48
This adds block mappings using direct pointers which are stored in the i_bmap array of inode. Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
|
|
* direct.h - NILFS direct block pointer.
|
|
*
|
|
* 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
|
|
*
|
|
* Written by Koji Sato <koji@osrg.net>.
|
|
*/
|
|
|
|
#ifndef _NILFS_DIRECT_H
|
|
#define _NILFS_DIRECT_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/buffer_head.h>
|
|
#include "bmap.h"
|
|
|
|
|
|
struct nilfs_direct;
|
|
|
|
/**
|
|
* struct nilfs_direct_operations - direct mapping operation table
|
|
*/
|
|
struct nilfs_direct_operations {
|
|
__u64 (*dop_find_target)(const struct nilfs_direct *, __u64);
|
|
void (*dop_set_target)(struct nilfs_direct *, __u64, __u64);
|
|
int (*dop_propagate)(struct nilfs_direct *, struct buffer_head *);
|
|
int (*dop_assign)(struct nilfs_direct *, __u64, __u64,
|
|
struct buffer_head **, sector_t,
|
|
union nilfs_binfo *);
|
|
};
|
|
|
|
/**
|
|
* struct nilfs_direct_node - direct node
|
|
* @dn_flags: flags
|
|
* @dn_pad: padding
|
|
*/
|
|
struct nilfs_direct_node {
|
|
__u8 dn_flags;
|
|
__u8 pad[7];
|
|
};
|
|
|
|
/**
|
|
* struct nilfs_direct - direct mapping
|
|
* @d_bmap: bmap structure
|
|
* @d_ops: direct mapping operation table
|
|
*/
|
|
struct nilfs_direct {
|
|
struct nilfs_bmap d_bmap;
|
|
|
|
/* direct-mapping-specific members */
|
|
const struct nilfs_direct_operations *d_ops;
|
|
};
|
|
|
|
|
|
#define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1)
|
|
#define NILFS_DIRECT_KEY_MIN 0
|
|
#define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1)
|
|
|
|
|
|
int nilfs_direct_init(struct nilfs_bmap *, __u64, __u64);
|
|
int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *,
|
|
__u64 *, int, __u64, __u64);
|
|
|
|
|
|
#endif /* _NILFS_DIRECT_H */
|