cluster/afr: Avoid self-healing extended attribute used by SELinux.

Since removexattr() fails to remove "security.selinux" in a system 
where SELinux is enforcing, xattr self-healing fails. 
As a consequence of this, user extended attributes are not being healed.
Added a check in afr to prune SELinux xattr from the dictionary 
used for removing xattrs from the sink.

Minor changes in tests and md-cache as well.

Signed-off-by: Vijay Bellur <vbellur@redhat.com>
Change-Id: I854bfc0098dde812ce2afe64b125ee40c04bdeb1
BUG: 957877
Reviewed-on: http://review.gluster.org/4905
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/tests/bugs/bug-957877.t b/tests/bugs/bug-957877.t
new file mode 100644
index 00000000000..23aefea2549
--- /dev/null
+++ b/tests/bugs/bug-957877.t
@@ -0,0 +1,31 @@
+#!/bin/bash
+. $(dirname $0)/../include.rc
+. $(dirname $0)/../volume.rc
+. $(dirname $0)/../afr.rc
+cleanup;
+
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}{0,1}
+TEST $CLI volume start $V0;
+
+TEST glusterfs --volfile-server=$H0 --volfile-id=$V0 $M0;
+kill_brick $V0 $H0 $B0/${V0}0
+TEST touch $M0/f1
+TEST setfattr -n "user.foo" -v "test" $M0/f1
+
+BRICK=$B0"/${V0}1"
+
+TEST $CLI volume start $V0 force
+sleep 5
+TEST $CLI volume heal $V0
+
+# Wait for self-heal to complete
+EXPECT_WITHIN 30 '0' count_sh_entries $BRICK;
+
+TEST getfattr -n "user.foo" $B0/${V0}0/f1;
+
+TEST $CLI volume stop $V0;
+TEST $CLI volume delete $V0;
+
+cleanup;