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xfs: cleanup xchk_dir_rec

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Use an offset as the main means for iteration, and only do pointer
arithmetics to find the data/unused entries.

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>
This commit is contained in:
Christoph Hellwig 2019-11-08 15:05:33 -08:00 committed by Darrick J. Wong
parent 2f4369a862
commit 4c037dd5fd
1 changed files with 14 additions and 14 deletions
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28
fs/xfs/scrub/dir.c
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@ -190,7 +190,8 @@ xchk_dir_rec(
struct xfs_dir2_data_entry *dent;
struct xfs_buf *bp;
struct xfs_dir2_leaf_entry *ent;
char *p, *endp;
void *endp;
unsigned int iter_off;
xfs_ino_t ino;
xfs_dablk_t rec_bno;
xfs_dir2_db_t db;
@ -240,32 +241,31 @@ xchk_dir_rec(
if (ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
goto out_relse;
dent = (struct xfs_dir2_data_entry *)(((char *)bp->b_addr) + off);
dent = bp->b_addr + off;
/* Make sure we got a real directory entry. */
p = (char *)mp->m_dir_inode_ops->data_entry_p(bp->b_addr);
iter_off = mp->m_dir_inode_ops->data_entry_offset;
endp = xfs_dir3_data_endp(mp->m_dir_geo, bp->b_addr);
if (!endp) {
xchk_fblock_set_corrupt(ds->sc, XFS_DATA_FORK, rec_bno);
goto out_relse;
}
while (p < endp) {
struct xfs_dir2_data_entry *dep;
struct xfs_dir2_data_unused *dup;
for (;;) {
struct xfs_dir2_data_entry *dep = bp->b_addr + iter_off;
struct xfs_dir2_data_unused *dup = bp->b_addr + iter_off;
if (iter_off >= endp - bp->b_addr) {
xchk_fblock_set_corrupt(ds->sc, XFS_DATA_FORK, rec_bno);
goto out_relse;
}
dup = (struct xfs_dir2_data_unused *)p;
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
p += be16_to_cpu(dup->length);
iter_off += be16_to_cpu(dup->length);
continue;
}
dep = (struct xfs_dir2_data_entry *)p;
if (dep == dent)
break;
p += mp->m_dir_inode_ops->data_entsize(dep->namelen);
}
if (p >= endp) {
xchk_fblock_set_corrupt(ds->sc, XFS_DATA_FORK, rec_bno);
goto out_relse;
iter_off += mp->m_dir_inode_ops->data_entsize(dep->namelen);
}
/* Retrieve the entry, sanity check it, and compare hashes. */