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xfs: refactor btree pointer checks

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Refactor the btree pointer checks so that we can call them from the
scrub code without logging errors to dmesg.  Preserve the existing error
reporting for regular operations.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-10-17 21:37:33 -07:00
parent 21ec54168b
commit f135761a73
3 changed files with 48 additions and 45 deletions
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4
fs/xfs/libxfs/xfs_bmap.c
View File

@ -646,8 +646,8 @@ xfs_bmap_btree_to_extents(
cbno = be64_to_cpu(*pp);
*logflagsp = 0;
#ifdef DEBUG
if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
return error;
XFS_WANT_CORRUPTED_RETURN(cur->bc_mp,
xfs_btree_check_lptr(cur, cbno, 1));
#endif
error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp, XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);

76
fs/xfs/libxfs/xfs_btree.c
View File

@ -177,59 +177,53 @@ xfs_btree_check_block(
return xfs_btree_check_sblock(cur, block, level, bp);
}
/*
* Check that (long) pointer is ok.
*/
int /* error (0 or EFSCORRUPTED) */
/* Check that this long pointer is valid and points within the fs. */
bool
xfs_btree_check_lptr(
struct xfs_btree_cur *cur, /* btree cursor */
xfs_fsblock_t bno, /* btree block disk address */
int level) /* btree block level */
struct xfs_btree_cur *cur,
xfs_fsblock_t fsbno,
int level)
{
XFS_WANT_CORRUPTED_RETURN(cur->bc_mp,
level > 0 &&
bno != NULLFSBLOCK &&
XFS_FSB_SANITY_CHECK(cur->bc_mp, bno));
return 0;
if (level <= 0)
return false;
return xfs_verify_fsbno(cur->bc_mp, fsbno);
}
/* Check that this short pointer is valid and points within the AG. */
bool
xfs_btree_check_sptr(
struct xfs_btree_cur *cur,
xfs_agblock_t agbno,
int level)
{
if (level <= 0)
return false;
return xfs_verify_agbno(cur->bc_mp, cur->bc_private.a.agno, agbno);
}
#ifdef DEBUG
/*
* Check that (short) pointer is ok.
* Check that a given (indexed) btree pointer at a certain level of a
* btree is valid and doesn't point past where it should.
*/
STATIC int /* error (0 or EFSCORRUPTED) */
xfs_btree_check_sptr(
struct xfs_btree_cur *cur, /* btree cursor */
xfs_agblock_t bno, /* btree block disk address */
int level) /* btree block level */
{
xfs_agblock_t agblocks = cur->bc_mp->m_sb.sb_agblocks;
XFS_WANT_CORRUPTED_RETURN(cur->bc_mp,
level > 0 &&
bno != NULLAGBLOCK &&
bno != 0 &&
bno < agblocks);
return 0;
}
/*
* Check that block ptr is ok.
*/
STATIC int /* error (0 or EFSCORRUPTED) */
int
xfs_btree_check_ptr(
struct xfs_btree_cur *cur, /* btree cursor */
union xfs_btree_ptr *ptr, /* btree block disk address */
int index, /* offset from ptr to check */
int level) /* btree block level */
struct xfs_btree_cur *cur,
union xfs_btree_ptr *ptr,
int index,
int level)
{
if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
return xfs_btree_check_lptr(cur,
be64_to_cpu((&ptr->l)[index]), level);
XFS_WANT_CORRUPTED_RETURN(cur->bc_mp,
xfs_btree_check_lptr(cur,
be64_to_cpu((&ptr->l)[index]), level));
} else {
return xfs_btree_check_sptr(cur,
be32_to_cpu((&ptr->s)[index]), level);
XFS_WANT_CORRUPTED_RETURN(cur->bc_mp,
xfs_btree_check_sptr(cur,
be32_to_cpu((&ptr->s)[index]), level));
}
return 0;
}
#endif

13
fs/xfs/libxfs/xfs_btree.h
View File

@ -269,10 +269,19 @@ xfs_btree_check_block(
/*
* Check that (long) pointer is ok.
*/
int /* error (0 or EFSCORRUPTED) */
bool /* error (0 or EFSCORRUPTED) */
xfs_btree_check_lptr(
struct xfs_btree_cur *cur, /* btree cursor */
xfs_fsblock_t ptr, /* btree block disk address */
xfs_fsblock_t fsbno, /* btree block disk address */
int level); /* btree block level */
/*
* Check that (short) pointer is ok.
*/
bool /* error (0 or EFSCORRUPTED) */
xfs_btree_check_sptr(
struct xfs_btree_cur *cur, /* btree cursor */
xfs_agblock_t agbno, /* btree block disk address */
int level); /* btree block level */
/*