This is a note to let you know that I've just added the patch titled
xfs: fix incorrect extent state in xfs_bmap_add_extent_unwritten_real
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: xfs-fix-incorrect-extent-state-in-xfs_bmap_add_extent_unwritten_real.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Dec 18 14:47:43 CET 2017
From: Christoph Hellwig hch@lst.de Date: Tue, 17 Oct 2017 14:16:19 -0700 Subject: xfs: fix incorrect extent state in xfs_bmap_add_extent_unwritten_real
From: Christoph Hellwig hch@lst.de
[ Upstream commit 5e422f5e4fd71d18bc6b851eeb3864477b3d842e ]
There was one spot in xfs_bmap_add_extent_unwritten_real that didn't use the passed in new extent state but always converted to normal, leading to wrong behavior when converting from normal to unwritten.
Only found by code inspection, it seems like this code path to move partial extent from written to unwritten while merging it with the next extent is rarely exercised.
Signed-off-by: Christoph Hellwig hch@lst.de Reviewed-by: Brian Foster bfoster@redhat.com Reviewed-by: Darrick J. Wong darrick.wong@oracle.com Signed-off-by: Darrick J. Wong darrick.wong@oracle.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/xfs/libxfs/xfs_bmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -2670,7 +2670,7 @@ xfs_bmap_add_extent_unwritten_real( &i))) goto done; XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done); - cur->bc_rec.b.br_state = XFS_EXT_NORM; + cur->bc_rec.b.br_state = new->br_state; if ((error = xfs_btree_insert(cur, &i))) goto done; XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
Patches currently in stable-queue which might be from hch@lst.de are
queue-4.4/xfs-fix-incorrect-extent-state-in-xfs_bmap_add_extent_unwritten_real.patch queue-4.4/target-iscsi-fix-a-race-condition-in-iscsit_add_reject_from_cmd.patch