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@xxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
---
fs/xfs/xfs_reflink.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 1e39a7d21c7e..ead35209ffae 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -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)) {
--
2.19.0
