mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-14 15:54:15 +08:00
70a9883c5f
All of the buffer operations structures are needed to be exported for xfs_db, so move them all to a common location rather than spreading them all over the place. They are verifying the on-disk format, so while xfs_format.h might be a good place, it is not part of the on disk format. Hence we need to create a new header file that we centralise these related definitions. Start by moving the bffer operations structures, and then also move all the other definitions that have crept into xfs_log_format.h and xfs_format.h as there was no other shared header file to put them in. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ben Myers <bpm@sgi.com>
99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2000,2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it would 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 the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef __XFS_ALLOC_BTREE_H__
|
|
#define __XFS_ALLOC_BTREE_H__
|
|
|
|
/*
|
|
* Freespace on-disk structures
|
|
*/
|
|
|
|
struct xfs_buf;
|
|
struct xfs_btree_cur;
|
|
struct xfs_mount;
|
|
|
|
/*
|
|
* There are two on-disk btrees, one sorted by blockno and one sorted
|
|
* by blockcount and blockno. All blocks look the same to make the code
|
|
* simpler; if we have time later, we'll make the optimizations.
|
|
*/
|
|
#define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */
|
|
#define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */
|
|
#define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */
|
|
#define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */
|
|
|
|
/*
|
|
* Data record/key structure
|
|
*/
|
|
typedef struct xfs_alloc_rec {
|
|
__be32 ar_startblock; /* starting block number */
|
|
__be32 ar_blockcount; /* count of free blocks */
|
|
} xfs_alloc_rec_t, xfs_alloc_key_t;
|
|
|
|
typedef struct xfs_alloc_rec_incore {
|
|
xfs_agblock_t ar_startblock; /* starting block number */
|
|
xfs_extlen_t ar_blockcount; /* count of free blocks */
|
|
} xfs_alloc_rec_incore_t;
|
|
|
|
/* btree pointer type */
|
|
typedef __be32 xfs_alloc_ptr_t;
|
|
|
|
/*
|
|
* Block numbers in the AG:
|
|
* SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
|
|
*/
|
|
#define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
|
|
#define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
|
|
|
|
/*
|
|
* Btree block header size depends on a superblock flag.
|
|
*/
|
|
#define XFS_ALLOC_BLOCK_LEN(mp) \
|
|
(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
|
|
XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
|
|
|
|
/*
|
|
* Record, key, and pointer address macros for btree blocks.
|
|
*
|
|
* (note that some of these may appear unused, but they are used in userspace)
|
|
*/
|
|
#define XFS_ALLOC_REC_ADDR(mp, block, index) \
|
|
((xfs_alloc_rec_t *) \
|
|
((char *)(block) + \
|
|
XFS_ALLOC_BLOCK_LEN(mp) + \
|
|
(((index) - 1) * sizeof(xfs_alloc_rec_t))))
|
|
|
|
#define XFS_ALLOC_KEY_ADDR(mp, block, index) \
|
|
((xfs_alloc_key_t *) \
|
|
((char *)(block) + \
|
|
XFS_ALLOC_BLOCK_LEN(mp) + \
|
|
((index) - 1) * sizeof(xfs_alloc_key_t)))
|
|
|
|
#define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
|
|
((xfs_alloc_ptr_t *) \
|
|
((char *)(block) + \
|
|
XFS_ALLOC_BLOCK_LEN(mp) + \
|
|
(maxrecs) * sizeof(xfs_alloc_key_t) + \
|
|
((index) - 1) * sizeof(xfs_alloc_ptr_t)))
|
|
|
|
extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
|
|
struct xfs_trans *, struct xfs_buf *,
|
|
xfs_agnumber_t, xfs_btnum_t);
|
|
extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
|
|
|
|
#endif /* __XFS_ALLOC_BTREE_H__ */
|