lock: Add fencing support

design reference: https://review.gluster.org/#/c/glusterfs-specs/+/21925/

This patch adds the lock preempt support.

Note: The current model stores lock enforcement information as separate
xattr on disk. There is another effort going in parallel to store this
in stat(x) of the file. This patch is self sufficient to add fencing
support. Based on the availability of the stat(x) support either I will
rebase this patch or we can modify the necessary bits post merging this
patch.

Change-Id: If4a42f3e0afaee1f66cdb0360ad4e0c005b5b017
updates: #466
Signed-off-by: Susant Palai <spalai@redhat.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/tests/basic/fencing/fencing-crash-conistency.t b/tests/basic/fencing/fencing-crash-conistency.t
new file mode 100644
index 00000000000..cca8ee7343f
--- /dev/null
+++ b/tests/basic/fencing/fencing-crash-conistency.t
@@ -0,0 +1,61 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+
+cleanup;
+
+# with lock enforcement flag write should fail with out lock
+
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume info;
+
+TEST $CLI volume create $V0 $H0:$B0/${V0}1
+EXPECT 'Created' volinfo_field $V0 'Status';
+TEST $CLI volume start $V0;
+EXPECT 'Started' volinfo_field $V0 'Status';
+TEST $CLI volume set $V0 performance.write-behind off
+TEST glusterfs -s $H0 --volfile-id $V0 $M0
+
+TEST touch $M0/file
+
+#write should pass
+TEST "echo "test" > $M0/file"
+TEST "truncate -s 0 $M0/file"
+
+#enable mandatory locking
+TEST $CLI volume set $V0 locks.mandatory-locking forced
+
+#write should pass
+TEST "echo "test" >> $M0/file"
+TEST "truncate -s 0 $M0/file"
+
+#enforce lock on the file
+TEST setfattr -n trusted.glusterfs.enforce-mandatory-lock -v 1 $M0/file
+
+#write should fail
+TEST ! "echo "test" >> $M0/file"
+TEST ! "truncate -s 0 $M0/file"
+
+#remove lock enforcement flag
+TEST setfattr -x trusted.glusterfs.enforce-mandatory-lock $M0/file
+
+#write should pass
+TEST "echo "test" >> $M0/file"
+TEST "truncate -s 0 $M0/file"
+
+#enforce lock on the file
+TEST setfattr -n trusted.glusterfs.enforce-mandatory-lock -v 1 $M0/file
+#kill brick
+TEST kill_brick $V0 $H0 $B0/${V0}1
+
+TEST $CLI volume start $V0 force
+
+# wait one second for the brick to come online
+sleep 2
+#write should fail (lock xlator gets lock enforcement info from disk)
+TEST ! "echo "test" >> $M0/file"
+TEST ! "truncate -s 0 $M0/file"
+
+cleanup;
\ No newline at end of file