nfs: do opendir for "naked" readdirp to force self-heal checks

Instead of an opendir, the first thing the Linux NFS client usually sends
us is a readdirp at offset zero, effectively bypassing our self-heal checks.
Detect this condition and issue our own opendir to compensate.

Change-Id: I69463370abd6235d705bf80b8c77fae4a61096ae
BUG: 830665
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: http://review.gluster.org/4067
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

1 files changed, 104 insertions, 0 deletions

diff --git a/tests/bugs/bug-830665.t b/tests/bugs/bug-830665.t
new file mode 100755
index 00000000000..327037de487
--- /dev/null
+++ b/tests/bugs/bug-830665.t
@@ -0,0 +1,104 @@
+#!/bin/bash
+
+. $(dirname $0)/../include.rc
+H0=$(hostname -s)
+
+function recreate {
+	rm -rf $1 && mkdir -p $1
+}
+
+TEST glusterd
+TEST pidof glusterd
+TEST $CLI volume info;
+
+## Start and create a volume
+recreate ${B0}/${V0}-0
+recreate ${B0}/${V0}-1
+TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}-{0,1}
+
+function volinfo_field()
+{
+    local vol=$1;
+    local field=$2;
+
+    $CLI volume info $vol | grep "^$field: " | sed 's/.*: //';
+}
+
+
+## Verify volume is created
+EXPECT "$V0" volinfo_field $V0 'Volume Name';
+EXPECT 'Created' volinfo_field $V0 'Status';
+
+## Make sure stat-prefetch doesn't prevent self-heal checks.
+TEST $CLI volume set $V0 performance.stat-prefetch off;
+
+## Make sure automatic self-heal doesn't perturb our results.
+TEST $CLI volume set $V0 cluster.self-heal-daemon off
+
+## Start volume and verify
+TEST $CLI volume start $V0;
+EXPECT 'Started' volinfo_field $V0 'Status';
+
+
+## Wait for volume to register with rpc.mountd
+sleep 5;
+
+## Mount NFS
+TEST mount -t nfs -o vers=3,nolock,soft,intr $H0:/$V0 $N0;
+
+## Create some files and directories
+echo "test_data" > $N0/a_file;
+mkdir $N0/a_dir;
+echo "more_test_data" > $N0/a_dir/another_file;
+
+## Unmount and stop the volume.
+TEST umount $N0;
+TEST $CLI volume stop $V0;
+
+# Recreate the brick. Note that because of http://review.gluster.org/#change,4202
+# we need to preserve and restore the volume ID or else the brick (and thus the
+# entire not-very-HA-any-more volume) won't start. When that bug is fixed, we can
+# remove the [gs]etxattr calls.
+volid=$(getfattr -e hex -n trusted.glusterfs.volume-id $B0/${V0}-0 2> /dev/null \
+	| grep = | cut -d= -f2)
+rm -rf $B0/${V0}-0;
+mkdir $B0/${V0}-0;
+setfattr -n trusted.glusterfs.volume-id -v $volid $B0/${V0}-0
+
+## Restart and remount. Note that we use actimeo=0 so that the stat calls
+## we need for self-heal don't get blocked by the NFS client.
+TEST $CLI volume start $V0;
+sleep 5
+TEST mount -t nfs -o vers=3,nolock,soft,intr,actimeo=0 $H0:/$V0 $N0;
+
+## The Linux NFS client has a really charming habit of caching stuff right
+## after mount, even though we set actimeo=0 above. Life would be much easier
+## if NFS developers cared as much about correctness as they do about shaving
+## a few seconds off of benchmarks.
+ls -l $N0 &> /dev/null;
+sleep 5;
+
+## Force entry self-heal.
+find $N0 | xargs stat > /dev/null;
+#ls -lR $N0 > /dev/null;
+
+## Do NOT check through the NFS mount here. That will force a new self-heal
+## check, but we want to test whether self-heal already happened.
+
+## Make sure everything's in order on the recreated brick.
+EXPECT 'test_data' cat $B0/${V0}-0/a_file;
+EXPECT 'more_test_data' cat $B0/${V0}-0/a_dir/another_file;
+
+if [ "$EXIT_EARLY" = "1" ]; then
+	exit 0;
+fi
+
+## Finish up
+TEST umount $N0;
+TEST $CLI volume stop $V0;
+EXPECT 'Stopped' volinfo_field $V0 'Status';
+
+TEST $CLI volume delete $V0;
+TEST ! $CLI volume info $V0;
+
+cleanup;