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3033342a0b
This will cut off 16 bytes from the nilfs_bmap struct which is embedded in the on-memory inode of nilfs. The b_high field was never used, and the b_low field stores a constant value which can be determined by whether the inode uses btree for block mapping or not. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/*
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* direct.h - NILFS direct block pointer.
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*
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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*/
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#ifndef _NILFS_DIRECT_H
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#define _NILFS_DIRECT_H
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#include <linux/types.h>
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#include <linux/buffer_head.h>
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#include "bmap.h"
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struct nilfs_direct;
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/**
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* struct nilfs_direct_operations - direct mapping operation table
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*/
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struct nilfs_direct_operations {
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__u64 (*dop_find_target)(const struct nilfs_direct *, __u64);
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void (*dop_set_target)(struct nilfs_direct *, __u64, __u64);
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int (*dop_propagate)(struct nilfs_direct *, struct buffer_head *);
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int (*dop_assign)(struct nilfs_direct *, __u64, __u64,
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struct buffer_head **, sector_t,
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union nilfs_binfo *);
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};
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/**
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* struct nilfs_direct_node - direct node
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* @dn_flags: flags
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* @dn_pad: padding
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*/
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struct nilfs_direct_node {
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__u8 dn_flags;
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__u8 pad[7];
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};
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/**
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* struct nilfs_direct - direct mapping
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* @d_bmap: bmap structure
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* @d_ops: direct mapping operation table
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*/
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struct nilfs_direct {
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struct nilfs_bmap d_bmap;
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/* direct-mapping-specific members */
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const struct nilfs_direct_operations *d_ops;
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};
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#define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1)
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#define NILFS_DIRECT_KEY_MIN 0
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#define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1)
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int nilfs_direct_init(struct nilfs_bmap *);
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int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *,
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__u64 *, int);
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#endif /* _NILFS_DIRECT_H */
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