gluster: IPv6 single stack support

Summary:
- This diff changes all locations in the code to prefer inet6 family
  instead of inet.  This will allow change GlusterFS to operate
  via IPv6 instead of IPv4 for all internal operations while still
  being able to serve (FUSE or NFS) clients via IPv4.
- The changes apply to NFS as well.
- This diff ports D1892990, D1897341 & D1896522 to the 3.8 branch.

Test Plan: Prove tests!

Reviewers: dph, rwareing

Signed-off-by: Shreyas Siravara <sshreyas@fb.com>

Change-Id: I34fdaaeb33c194782255625e00616faf75d60c33
Reviewed-on: http://review.gluster.org/16059
Reviewed-by: Shreyas Siravara <sshreyas@fb.com>
Tested-by: Shreyas Siravara <sshreyas@fb.com>
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/basic/mount-nfs-auth.t b/tests/basic/mount-nfs-auth.t
index 9df5cb45c3b..cd0189788ba 100755
--- a/tests/basic/mount-nfs-auth.t
+++ b/tests/basic/mount-nfs-auth.t
@@ -15,6 +15,9 @@ TEST glusterd
 TEST pidof glusterd
 TEST $CLI volume info
 
+H0IP=$(ip addr show |grep -w inet |grep -v 127.0.0.1|awk '{ print $2 }'| cut -d "/" -f 1)
+H0IP6=$(host $HOSTNAME | grep IPv6 | awk '{print $NF}')
+
 # Export variables for allow & deny
 EXPORT_ALLOW="/$V0 $H0(sec=sys,rw,anonuid=0) @ngtop(sec=sys,rw,anonuid=0)"
 EXPORT_ALLOW_SLASH="/$V0/ $H0(sec=sys,rw,anonuid=0) @ngtop(sec=sys,rw,anonuid=0)"
@@ -37,6 +40,10 @@ function build_dirs () {
         mkdir -p $B0/b{0,1,2}/L1/L2/L3
 }
 
+function export_allow_this_host_ipv6 () {
+        printf "$EXPORT_ALLOW6\n" > /var/lib/glusterd/nfs/exports
+}
+
 function export_allow_this_host () {
         printf "$EXPORT_ALLOW\n" > ${NFSDIR}/exports
 }
@@ -186,6 +193,11 @@ EXPECT_WITHIN $NFS_EXPORT_TIMEOUT "1" is_nfs_export_available
 
 ## Mount NFS
 EXPECT "Y" check_mount_success $V0
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount NFS using the IPv6 export
+export_allow_this_host_ipv6
+EXPECT "Y" check_mount_success $V0
 
 ## Disallow host
 TEST export_deny_this_host