This is a note to let you know that I've just added the patch titled
iomap: don't bother unsharing delalloc extents
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iomap-don-t-bother-unsharing-delalloc-extents.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 754c8ca84954da928cee758893700ae64add81a0
Author: Darrick J. Wong <djwong@xxxxxxxxxx>
Date: Wed Oct 2 08:00:40 2024 -0700
iomap: don't bother unsharing delalloc extents
[ Upstream commit f7a4874d977bf4202ad575031222e78809a36292 ]
If unshare encounters a delalloc reservation in the srcmap, that means
that the file range isn't shared because delalloc reservations cannot be
reflinked. Therefore, don't try to unshare them.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20241002150040.GB21853@frogsfrogsfrogs
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Stable-dep-of: 50793801fc7f ("fsdax: dax_unshare_iter needs to copy entire blocks")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 527d3bcfc69a7..b1af9001e6db0 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1096,7 +1096,7 @@ static loff_t iomap_unshare_iter(struct iomap_iter *iter)
return length;
/*
- * Don't bother with holes or unwritten extents.
+ * Don't bother with delalloc reservations, holes or unwritten extents.
*
* Note that we use srcmap directly instead of iomap_iter_srcmap as
* unsharing requires providing a separate source map, and the presence
@@ -1105,6 +1105,7 @@ static loff_t iomap_unshare_iter(struct iomap_iter *iter)
* fork for XFS.
*/
if (iter->srcmap.type == IOMAP_HOLE ||
+ iter->srcmap.type == IOMAP_DELALLOC ||
iter->srcmap.type == IOMAP_UNWRITTEN)
return length;
