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xfs: do not do pointer arithmetic on extent records

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We need to call xfs_iext_get_ext for the previous extent to get a
valid pointer, and can't just do pointer arithmetics as they might
be in different pages.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lachlan McIlroy <lmcilroy@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-05-11 15:04:09 +00:00 committed by Alex Elder
parent 00239acf36
commit f1c63b73cf
1 changed files with 6 additions and 3 deletions
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9
fs/xfs/xfs_bmap.c
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@ -5143,9 +5143,12 @@ xfs_bunmapi(
*/
ASSERT(bno >= del.br_blockcount);
bno -= del.br_blockcount;
if (bno < got.br_startoff) {
if (--lastx >= 0)
xfs_bmbt_get_all(--ep, &got);
if (got.br_startoff > bno) {
if (--lastx >= 0) {
ep = xfs_iext_get_ext(ifp,
lastx);
xfs_bmbt_get_all(ep, &got);
}
}
continue;
} else if (del.br_state == XFS_EXT_UNWRITTEN) {