mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 18:11:56 +00:00
ee1a47ab0e
Add support for larger btree blocks that contains a CRC32C checksum, a filesystem uuid and block number for detecting filesystem consistency and out of place writes. [dchinner@redhat.com] Also include an owner field to allow reverse mappings to be implemented for improved repairability and a LSN field to so that log recovery can easily determine the last modification that made it to disk for each buffer. [dchinner@redhat.com] Add buffer log format flags to indicate the type of buffer to recovery so that we don't have to do blind magic number tests to determine what the buffer is. [dchinner@redhat.com] Modified to fit into the verifier structure. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Ben Myers <bpm@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
116 lines
3.4 KiB
C
116 lines
3.4 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_IALLOC_BTREE_H__
|
|
#define __XFS_IALLOC_BTREE_H__
|
|
|
|
/*
|
|
* Inode map on-disk structures
|
|
*/
|
|
|
|
struct xfs_buf;
|
|
struct xfs_btree_cur;
|
|
struct xfs_mount;
|
|
|
|
/*
|
|
* There is a btree for the inode map per allocation group.
|
|
*/
|
|
#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
|
|
#define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
|
|
|
|
typedef __uint64_t xfs_inofree_t;
|
|
#define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
|
|
#define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
|
|
#define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
|
|
#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
|
|
|
|
static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
|
|
{
|
|
return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
|
|
}
|
|
|
|
/*
|
|
* Data record structure
|
|
*/
|
|
typedef struct xfs_inobt_rec {
|
|
__be32 ir_startino; /* starting inode number */
|
|
__be32 ir_freecount; /* count of free inodes (set bits) */
|
|
__be64 ir_free; /* free inode mask */
|
|
} xfs_inobt_rec_t;
|
|
|
|
typedef struct xfs_inobt_rec_incore {
|
|
xfs_agino_t ir_startino; /* starting inode number */
|
|
__int32_t ir_freecount; /* count of free inodes (set bits) */
|
|
xfs_inofree_t ir_free; /* free inode mask */
|
|
} xfs_inobt_rec_incore_t;
|
|
|
|
|
|
/*
|
|
* Key structure
|
|
*/
|
|
typedef struct xfs_inobt_key {
|
|
__be32 ir_startino; /* starting inode number */
|
|
} xfs_inobt_key_t;
|
|
|
|
/* btree pointer type */
|
|
typedef __be32 xfs_inobt_ptr_t;
|
|
|
|
/*
|
|
* block numbers in the AG.
|
|
*/
|
|
#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
|
|
#define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
|
|
|
|
/*
|
|
* Btree block header size depends on a superblock flag.
|
|
*/
|
|
#define XFS_INOBT_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_INOBT_REC_ADDR(mp, block, index) \
|
|
((xfs_inobt_rec_t *) \
|
|
((char *)(block) + \
|
|
XFS_INOBT_BLOCK_LEN(mp) + \
|
|
(((index) - 1) * sizeof(xfs_inobt_rec_t))))
|
|
|
|
#define XFS_INOBT_KEY_ADDR(mp, block, index) \
|
|
((xfs_inobt_key_t *) \
|
|
((char *)(block) + \
|
|
XFS_INOBT_BLOCK_LEN(mp) + \
|
|
((index) - 1) * sizeof(xfs_inobt_key_t)))
|
|
|
|
#define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
|
|
((xfs_inobt_ptr_t *) \
|
|
((char *)(block) + \
|
|
XFS_INOBT_BLOCK_LEN(mp) + \
|
|
(maxrecs) * sizeof(xfs_inobt_key_t) + \
|
|
((index) - 1) * sizeof(xfs_inobt_ptr_t)))
|
|
|
|
extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
|
|
struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
|
|
extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
|
|
|
|
extern const struct xfs_buf_ops xfs_inobt_buf_ops;
|
|
|
|
#endif /* __XFS_IALLOC_BTREE_H__ */
|