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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@kernel.org>
Link: https://lore.kernel.org/r/20241002150040.GB21853@frogsfrogsfrogs
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Stable-dep-of: 50793801fc7f ("fsdax: dax_unshare_iter needs to copy entire blocks")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Darrick J. Wong 2024-10-02 08:00:40 -07:00 committed by Greg Kroah-Hartman
parent 61ada94220
commit 3c06d13ec8
1 changed files with 2 additions and 1 deletions
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3
fs/iomap/buffered-io.c
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@ -1282,7 +1282,7 @@ 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
@ -1291,6 +1291,7 @@ 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;