Patch "xfs: fix incorrect extent state in xfs_bmap_add_extent_unwritten_real" has been added to the 4.14-stable tree

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 4.14-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:
xfs-fix-incorrect-extent-state-in-xfs_bmap_add_extent_unwritten_real.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Christoph Hellwig <[email protected]>
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 <[email protected]>

[ 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.

---
 fs/xfs/libxfs/xfs_bmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -2560,7 +2560,7 @@ 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 [email protected] are

queue-4.14/xfs-fix-incorrect-extent-state-in-xfs_bmap_add_extent_unwritten_real.patch queue-4.14/nvme-use-kref_get_unless_zero-in-nvme_find_get_ns.patch queue-4.14/target-iscsi-detect-conn_cmd_list-corruption-early.patch queue-4.14/target-iscsi-fix-a-race-condition-in-iscsit_add_reject_from_cmd.patch queue-4.14/scsi-core-fix-a-scsi_show_rq-null-pointer-dereference.patch queue-4.14/scsi-libsas-fix-length-error-in-sas_smp_handler.patch queue-4.14/blk-mq-sched-dispatch-from-scheduler-iff-progress-is-made-in-dispatch.patch