gNFS : make it possible to mount a subdir that actually is a symlink

We are using the function to export all sub-directories in a gluster volume via nfs.
For real directories it works fine but if we have a symbolic link which points to the
directory, it is not possible to mount that directory via nfs and the nameof the link.
Kernel nfs resolves symlink handle to directoryhandle , similar gluster nfs should
resolve the symbolic link handle into directory handle.

Change-Id: I8bd07534ba9474f0b863f2335b2fd222ab625dba
BUG: 1157223
Signed-off-by: jiffin tony thottan <jthottan@redhat.com>
Reviewed-on: http://review.gluster.org/9052
Reviewed-by: soumya k <skoduri@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/tests/bugs/bug-1157223-symlink-mounting.t b/tests/bugs/bug-1157223-symlink-mounting.t
new file mode 100644
index 00000000000..4ebc3453889
--- /dev/null
+++ b/tests/bugs/bug-1157223-symlink-mounting.t
@@ -0,0 +1,124 @@
+#!/bin/bash
+
+. $(dirname $0)/../include.rc
+. $(dirname $0)/../nfs.rc
+
+cleanup;
+
+## Start and create a volume
+TEST glusterd
+TEST pidof glusterd
+
+TEST $CLI volume info;
+TEST $CLI volume create $V0  $H0:$B0/$V0
+
+TEST $CLI volume start $V0;
+
+## Wait for volume to register with rpc.mountd
+EXPECT_WITHIN $NFS_EXPORT_TIMEOUT "1" is_nfs_export_available;
+
+## Mount NFS
+TEST mount_nfs $H0:/$V0 $N0 nolock;
+
+mkdir $N0/dir1;
+mkdir $N0/dir2;
+pushd $N0/ ;
+
+##link created using relative path
+ln -s dir1 symlink1;
+
+##relative path contains ".."
+ln -s ../dir1 dir2/symlink2;
+
+##link created using absolute path
+ln -s $N0/dir1 symlink3;
+
+##link pointing to another symlinks
+ln -s symlink1 symlink4
+ln -s symlink3 symlink5
+
+##dead links
+ln -s does/not/exist symlink6
+
+##link which contains ".." points out of glusterfs
+ln -s ../../ symlink7
+
+##links pointing to unauthorized area
+ln -s .glusterfs symlink8
+
+popd ;
+
+##Umount the volume
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount and umount NFS via directory
+TEST mount_nfs $H0:/$V0/dir1 $N0 nolock;
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount and umount NFS via symlink1
+TEST mount_nfs $H0:/$V0/symlink1 $N0 nolock;
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount and umount NFS via symlink2
+TEST  mount_nfs $H0:/$V0/dir2/symlink2 $N0 nolock;
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount NFS via symlink3 should fail
+TEST ! mount_nfs $H0:/$V0/symlink3 $N0 nolock;
+
+## Mount and umount NFS via symlink4
+TEST  mount_nfs $H0:/$V0/symlink4 $N0 nolock;
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount NFS via symlink5 should fail
+TEST ! mount_nfs $H0:/$V0/symlink5 $N0 nolock;
+
+## Mount NFS via symlink6 should fail
+TEST ! mount_nfs $H0:/$V0/symlink6 $N0 nolock;
+
+## Mount NFS via symlink7 should fail
+TEST ! mount_nfs $H0:/$V0/symlink7 $N0 nolock;
+
+## Mount NFS via symlink8 should fail
+TEST ! mount_nfs $H0:/$V0/symlink8 $N0 nolock;
+
+##Similar check for udp mount
+$CLI volume stop $V0
+TEST $CLI volume set $V0 nfs.mount-udp on
+$CLI volume start $V0
+
+## Wait for volume to register with rpc.mountd
+EXPECT_WITHIN $NFS_EXPORT_TIMEOUT "1" is_nfs_export_available;
+
+## Mount and umount NFS via directory
+TEST mount_nfs $H0:/$V0/dir1 $N0 nolock,mountproto=udp,proto=tcp;
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount and umount NFS via symlink1
+TEST mount_nfs $H0:/$V0/symlink1 $N0 nolock,mountproto=udp,proto=tcp;
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount and umount NFS via symlink2
+TEST  mount_nfs $H0:/$V0/dir2/symlink2 $N0 nolock,mountproto=udp,proto=tcp;
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount NFS via symlink3 should fail
+TEST ! mount_nfs $H0:/$V0/symlink3 $N0 nolock,mountproto=udp,proto=tcp;
+
+## Mount and umount NFS via symlink4
+TEST  mount_nfs $H0:/$V0/symlink4 $N0 nolock,mountproto=udp,proto=tcp;
+EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" umount_nfs $N0
+
+## Mount NFS via symlink5 should fail
+TEST ! mount_nfs $H0:/$V0/symlink5 $N0 nolock,mountproto=udp,proto=tcp;
+
+## Mount NFS via symlink6 should fail
+TEST ! mount_nfs $H0:/$V0/symlink6 $N0 nolock,mountproto=udp,proto=tcp;
+
+##symlink7 is not check here, because in udp mount ../../ resolves into root '/'
+
+## Mount NFS via symlink8 should fail
+TEST ! mount_nfs $H0:/$V0/symlink8 $N0 nolock,mountproto=udp,proto=tcp;
+
+rm -rf $H0:$B0/
+cleanup;