mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 16:44:10 +08:00
0c1d9e4a61
XFS only supports the unwritten extent bit in the data fork, and only if the file system has a version 5 superblock or the unwritten extent feature bit. We currently have two routines that validate the invariant: xfs_check_nostate_extents which return -EFSCORRUPTED when it's not met, and xfs_validate_extent that triggers and assert in debug build. Both of them iterate over all extents of an inode fork when called, which isn't very efficient. This patch instead adds a new helper that verifies the invariant one extent at a time, and calls it from the places where we iterate over all extents to converted them from or two the in-memory format. The callers then return -EFSCORRUPTED when reading invalid extents from disk, or trigger an assert when writing them to disk. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
150 lines
5.1 KiB
C
150 lines
5.1 KiB
C
/*
|
|
* Copyright (c) 2000,2002-2005 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_BMAP_BTREE_H__
|
|
#define __XFS_BMAP_BTREE_H__
|
|
|
|
struct xfs_btree_cur;
|
|
struct xfs_btree_block;
|
|
struct xfs_mount;
|
|
struct xfs_inode;
|
|
struct xfs_trans;
|
|
|
|
/*
|
|
* Btree block header size depends on a superblock flag.
|
|
*/
|
|
#define XFS_BMBT_BLOCK_LEN(mp) \
|
|
(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
|
|
XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN)
|
|
|
|
#define XFS_BMBT_REC_ADDR(mp, block, index) \
|
|
((xfs_bmbt_rec_t *) \
|
|
((char *)(block) + \
|
|
XFS_BMBT_BLOCK_LEN(mp) + \
|
|
((index) - 1) * sizeof(xfs_bmbt_rec_t)))
|
|
|
|
#define XFS_BMBT_KEY_ADDR(mp, block, index) \
|
|
((xfs_bmbt_key_t *) \
|
|
((char *)(block) + \
|
|
XFS_BMBT_BLOCK_LEN(mp) + \
|
|
((index) - 1) * sizeof(xfs_bmbt_key_t)))
|
|
|
|
#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
|
|
((xfs_bmbt_ptr_t *) \
|
|
((char *)(block) + \
|
|
XFS_BMBT_BLOCK_LEN(mp) + \
|
|
(maxrecs) * sizeof(xfs_bmbt_key_t) + \
|
|
((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
|
|
|
|
#define XFS_BMDR_REC_ADDR(block, index) \
|
|
((xfs_bmdr_rec_t *) \
|
|
((char *)(block) + \
|
|
sizeof(struct xfs_bmdr_block) + \
|
|
((index) - 1) * sizeof(xfs_bmdr_rec_t)))
|
|
|
|
#define XFS_BMDR_KEY_ADDR(block, index) \
|
|
((xfs_bmdr_key_t *) \
|
|
((char *)(block) + \
|
|
sizeof(struct xfs_bmdr_block) + \
|
|
((index) - 1) * sizeof(xfs_bmdr_key_t)))
|
|
|
|
#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
|
|
((xfs_bmdr_ptr_t *) \
|
|
((char *)(block) + \
|
|
sizeof(struct xfs_bmdr_block) + \
|
|
(maxrecs) * sizeof(xfs_bmdr_key_t) + \
|
|
((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
|
|
|
|
/*
|
|
* These are to be used when we know the size of the block and
|
|
* we don't have a cursor.
|
|
*/
|
|
#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
|
|
XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
|
|
|
|
#define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \
|
|
(int)(XFS_BMBT_BLOCK_LEN(mp) + \
|
|
((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
|
|
|
|
#define XFS_BMAP_BROOT_SPACE(mp, bb) \
|
|
(XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs)))
|
|
#define XFS_BMDR_SPACE_CALC(nrecs) \
|
|
(int)(sizeof(xfs_bmdr_block_t) + \
|
|
((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
|
|
#define XFS_BMAP_BMDR_SPACE(bb) \
|
|
(XFS_BMDR_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
|
|
|
|
/*
|
|
* Maximum number of bmap btree levels.
|
|
*/
|
|
#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
|
|
|
|
/*
|
|
* Prototypes for xfs_bmap.c to call.
|
|
*/
|
|
extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
|
|
struct xfs_btree_block *, int);
|
|
extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
|
|
extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
|
|
extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
|
|
extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
|
|
extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
|
|
|
|
extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
|
|
extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
|
|
|
|
extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
|
|
extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
|
|
xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
|
|
extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
|
|
extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
|
|
extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
|
|
extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
|
|
|
|
extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
|
|
xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
|
|
|
|
extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
|
|
xfs_bmdr_block_t *, int);
|
|
|
|
extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
|
|
extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
|
|
extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
|
|
|
|
extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
|
|
int whichfork, xfs_ino_t new_owner,
|
|
struct list_head *buffer_list);
|
|
|
|
extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
|
|
struct xfs_trans *, struct xfs_inode *, int);
|
|
|
|
/*
|
|
* Check that the extent does not contain an invalid unwritten extent flag.
|
|
*/
|
|
static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork,
|
|
struct xfs_bmbt_rec_host *ep)
|
|
{
|
|
if (ep->l0 >> (64 - BMBT_EXNTFLAG_BITLEN) == 0)
|
|
return true;
|
|
if (whichfork == XFS_DATA_FORK &&
|
|
xfs_sb_version_hasextflgbit(&mp->m_sb))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
#endif /* __XFS_BMAP_BTREE_H__ */
|