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xfs: fix fork selection in xfs_find_trim_cow_extent 

We should want to write directly into the data fork for blocks that don't
have an extent in the COW fork covering them yet.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2018-10-18 17:19:58 +11:00 committed by Dave Chinner
parent d392bc81bb
commit 032dc923b2
1 changed files with 6 additions and 2 deletions
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8
fs/xfs/xfs_reflink.c
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@ -369,9 +369,13 @@ xfs_find_trim_cow_extent(
* If we don't find an overlapping extent, trim the range we need to
* allocate to fit the hole we found.
*/
if (!xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &got) ||
got.br_startoff > offset_fsb)
if (!xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &got))
got.br_startoff = offset_fsb + count_fsb;
if (got.br_startoff > offset_fsb) {
xfs_trim_extent(imap, imap->br_startoff,
got.br_startoff - imap->br_startoff);
return xfs_reflink_trim_around_shared(ip, imap, shared);
}
*shared = true;
if (isnullstartblock(got.br_startblock)) {