From: "Darrick J. Wong" darrick.wong@oracle.com
[ Upstream commit c142932c29e533ee892f87b44d8abc5719edceec ]
In the reflink extent remap function, it turns out that uirec (the block mapping corresponding only to the part of the passed-in mapping that got unmapped) was not fully initialized. Specifically, br_state was not being copied from the passed-in struct to the uirec. This could lead to unpredictable results such as the reflinked mapping being marked unwritten in the destination file.
Signed-off-by: Darrick J. Wong darrick.wong@oracle.com Reviewed-by: Brian Foster bfoster@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/xfs/xfs_reflink.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 0f08153b49941..6a4fd1738b086 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1053,6 +1053,7 @@ xfs_reflink_remap_extent( uirec.br_startblock = irec->br_startblock + rlen; uirec.br_startoff = irec->br_startoff + rlen; uirec.br_blockcount = unmap_len - rlen; + uirec.br_state = irec->br_state; unmap_len = rlen;
/* If this isn't a real mapping, we're done. */