fstests: Add 9p network filesystem support

This commit adds support for the 9p network file system, which is mainly
used by QEMU for sharing a file system from the host to the guest VM.

To run xfstests on it, launch QEMU with e.g.:

-virtfs local,path=$TMPDIR/p9-test,security_model=mapped-xattr,mount_tag=p9-test
-virtfs local,path=$TMPDIR/p9-scratch,security_model=mapped-xattr,mount_tag=p9-scratch

and inside the VM run xfstests with:

export TEST_DEV=p9-test
export SCRATCH_DEV=p9-scratch
export PLAN9_MOUNT_OPTIONS="-o trans=virtio,version=9p2000.L,cache=loose,posixacl"

Signed-off-by: Tuomas Tynkkynen <tuomas@tuxera.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

4 files changed, 44 insertions, 3 deletions

diff --git a/check b/check
index f8db3cd6df..6078b1ef3c 100755
--- a/check
+++ b/check
@@ -67,6 +67,7 @@ check options
     -nfs                test NFS
     -glusterfs                test GlusterFS
     -cifs               test CIFS
+    -9p			test 9p
     -overlay		test overlay
     -pvfs2          test PVFS2
     -tmpfs              test TMPFS
@@ -265,6 +266,7 @@ while [ $# -gt 0 ]; do
 	-nfs)		FSTYP=nfs ;;
 	-glusterfs)	FSTYP=glusterfs ;;
 	-cifs)		FSTYP=cifs ;;
+	-9p)		FSTYP=9p ;;
 	-overlay)	FSTYP=overlay; export OVERLAY=true ;;
 	-pvfs2)		FSTYP=pvfs2 ;;
 	-tmpfs)		FSTYP=tmpfs ;;
diff --git a/common/attr b/common/attr
index 8a5c9eacd6..66b0227f72 100644
--- a/common/attr
+++ b/common/attr
@@ -243,7 +243,7 @@ _sort_getfattr_output()
 
 # set maximum total attr space based on fs type
 case "$FSTYP" in
-xfs|udf|pvfs2|ceph)
+xfs|udf|pvfs2|9p|ceph)
 	MAX_ATTRS=1000
 	;;
 *)
@@ -263,7 +263,7 @@ xfs|udf|btrfs)
 pvfs2)
 	MAX_ATTRVAL_SIZE=8192
 	;;
-ceph)
+9p|ceph)
 	MAX_ATTRVAL_SIZE=65536
 	;;
 *)
diff --git a/common/config b/common/config
index d0fbfe55a6..5f40413d9f 100644
--- a/common/config
+++ b/common/config
@@ -272,6 +272,9 @@ fi
 _mount_opts()
 {
 	case $FSTYP in
+	9p)
+		export MOUNT_OPTIONS=$PLAN9_MOUNT_OPTIONS
+		;;
 	xfs)
 		export MOUNT_OPTIONS=$XFS_MOUNT_OPTIONS
 		;;
@@ -327,6 +330,9 @@ _mount_opts()
 _test_mount_opts()
 {
 	case $FSTYP in
+	9p)
+		export TEST_FS_MOUNT_OPTS=$PLAN9_MOUNT_OPTIONS
+		;;
 	cifs)
 		export TEST_FS_MOUNT_OPTS=$CIFS_MOUNT_OPTIONS
 		;;
@@ -459,6 +465,9 @@ _check_device()
 	fi
 
 	case "$FSTYP" in
+	9p)
+		# 9p mount tags are just plain strings, so anything is allowed
+		;;
 	overlay)
 		if [ ! -d "$dev" ]; then
 			_fatal "common/config: $name ($dev) is not a directory for overlay"
diff --git a/common/rc b/common/rc
index fa3b215072..a3bfa1b0e7 100644
--- a/common/rc
+++ b/common/rc
@@ -166,6 +166,8 @@ case "$FSTYP" in
 	 ;;
     cifs)
 	 ;;
+    9p)
+	 ;;
     ceph)
 	 ;;
     glusterfs)
@@ -595,6 +597,9 @@ _test_mkfs()
     cifs)
 	# do nothing for cifs
 	;;
+    9p)
+	# do nothing for 9p
+	;;
     ceph)
 	# do nothing for ceph
 	;;
@@ -629,6 +634,9 @@ _mkfs_dev()
     nfs*)
 	# do nothing for nfs
 	;;
+    9p)
+	# do nothing for 9p
+	;;
     overlay)
 	# do nothing for overlay
 	;;
@@ -693,7 +701,7 @@ _scratch_mkfs()
 	local mkfs_status
 
 	case $FSTYP in
-	nfs*|cifs|ceph|overlay|glusterfs|pvfs2)
+	nfs*|cifs|ceph|overlay|glusterfs|pvfs2|9p)
 		# unable to re-create this fstyp, just remove all files in
 		# $SCRATCH_MNT to avoid EEXIST caused by the leftover files
 		# created in previous runs
@@ -1465,6 +1473,14 @@ _require_scratch_nocheck()
 			_notrun "this test requires a valid \$SCRATCH_MNT"
 		fi
 		;;
+	9p)
+		if [ -z "$SCRATCH_DEV" ]; then
+			_notrun "this test requires a valid \$SCRATCH_DEV"
+		fi
+		if [ ! -d "$SCRATCH_MNT" ]; then
+			_notrun "this test requires a valid \$SCRATCH_MNT"
+		fi
+		;;
 	nfs*|ceph)
 		echo $SCRATCH_DEV | grep -q ":/" > /dev/null 2>&1
 		if [ -z "$SCRATCH_DEV" -o "$?" != "0" ]; then
@@ -1571,6 +1587,14 @@ _require_test()
 			_notrun "this test requires a valid \$TEST_DIR"
 		fi
 		;;
+	9p)
+		if [ -z "$TEST_DEV" ]; then
+			_notrun "this test requires a valid \$TEST_DEV"
+		fi
+		if [ ! -d "$TEST_DIR" ]; then
+			_notrun "this test requires a valid \$TEST_DIR"
+		fi
+		;;
 	nfs*|ceph)
 		echo $TEST_DEV | grep -q ":/" > /dev/null 2>&1
 		if [ -z "$TEST_DEV" -o "$?" != "0" ]; then
@@ -2532,6 +2556,9 @@ _check_test_fs()
     cifs)
 	# no way to check consistency for cifs
 	;;
+    9p)
+	# no way to check consistency for 9p
+	;;
     ceph)
 	# no way to check consistency for CephFS
 	;;
@@ -2587,6 +2614,9 @@ _check_scratch_fs()
     cifs)
 	# Don't know how to check a CIFS filesystem, yet.
 	;;
+    9p)
+	# no way to check consistency for 9p
+	;;
     ceph)
 	# no way to check consistency for CephFS
 	;;