[RFE] xfstests: Add support for tmpfs filesystem

[Boris Ranto]

This is resent with the improved subject line.
This is just a simple patch to get the tmpfs working. I've made the full
xfstests run with the tmpfs as the target filesystem and it works quite
well. Some tests passed properly, some tests failed (and some of them due
to the nature of tmpfs).

I didn't change the xfstests logic to recognize a proper SCRATCH_DEV so the
SCRATCH_DEV for tmpfs should be in the nfs form (with the : in it) for this
to work properly.

diff --git a/common b/common
index 0723224..5853602 100644
--- a/common
+++ b/common
@@ -126,6 +126,7 @@ check options
     -xfs                test XFS (default)
     -udf                test UDF
     -nfs                test NFS
+    -tmpfs              test TMPFS
     -l            line mode diff
     -xdiff        graphical mode diff
     -udiff        show unified diff (default)
@@ -158,6 +159,11 @@ testlist options
         xpand=false
         ;;

+    -tmpfs)    # -tmpfs ... set FSTYP to tmpfs
+        FSTYP=tmpfs
+        xpand=false
+        ;;
+
     -g)    # -g group ... pick from group file
         group=true
         xpand=false
diff --git a/common.rc b/common.rc
index 602513a..a1351c9 100644
--- a/common.rc
+++ b/common.rc
@@ -97,6 +97,10 @@ _mount_opts()
     # acls aren't turned on by default on gfs2
     export MOUNT_OPTIONS="-o acl $GFS2_MOUNT_OPTIONS"
     ;;
+    tmpfs)
+    # We need to specify the size at mount, use 512 MB by default
+    export MOUNT_OPTIONS="-o size=512M $TMPFS_MOUNT_OPTIONS"
+    ;;
     *)
     ;;
     esac
@@ -116,6 +120,9 @@ _mkfs_opts()
     nfs)
     export MKFS_OPTIONS=$NFS_MKFS_OPTIONS
     ;;
+    tmpfs)
+    export MKFS_OPTIONS=$TMPFS_MKFS_OPTIONS
+    ;;
     reiserfs)
     export MKFS_OPTIONS="$REISERFS_MKFS_OPTIONS -q"
     ;;
@@ -327,6 +334,9 @@ _scratch_mkfs()
     nfs*)
     # do nothing for nfs
     ;;
+    tmpfs)
+    # do nothing for tmpfs
+    ;;
     udf)
         $MKFS_UDF_PROG $MKFS_OPTIONS $* $SCRATCH_DEV > /dev/null
     ;;
@@ -736,6 +746,12 @@ _require_scratch()
              _notrun "this test requires a valid \$SCRATCH_DEV"
          fi
          ;;
+    tmpfs)
+        if [ -z "$SCRATCH_DEV" -o ! -d "$SCRATCH_MNT" ];
+        then
+            _notrun "this test requires a valid \$SCRATCH_MNT and unique
$SCRATCH_DEV"
+        fi
+        ;;
     *)
          if [ -z "$SCRATCH_DEV" -o "`_is_block_dev $SCRATCH_DEV`" = "" ]
          then
@@ -1394,6 +1410,9 @@ _check_test_fs()
     nfs)
     # no way to check consistency for nfs
     ;;
+    tmpfs)
+        # no way to check the consistency for tmpfs
+    ;;
     udf)
     # do nothing for now
     ;;
@@ -1426,6 +1445,9 @@ _check_scratch_fs()
     nfs*)
     # Don't know how to check an NFS filesystem, yet.
     ;;
+    tmpfs)
+    # No way to check the consistency of tmpfs
+    ;;
     btrfs)
     _check_btrfs_filesystem $SCRATCH_DEV
     ;;
@@ -1517,6 +1539,33 @@ _setup_nfs_scratchdir()
     testdir=$SCRATCH_MNT
 }

+_setup_tmpfs_scratchdir()
+{
+    [ "$FSTYP" != "tmpfs" ] \
+        && _fail "setup_tmpfs_testdir: \$FSTYP is not tmpfs"
+    [ -z "$SCRATCH_DEV" ] \
+    && _notrun "this test requires a valid host fs for \$SCRATCH_DEV"
+    [ -z "$SCRATCH_MNT" ] \
+    && _notrun "this test requires a valid \$SCRATCH_MNT"
+
+    # mounted?
+    if _mount | grep -q $SCRATCH_DEV
+    then
+        # if it's mounted, make sure its on $SCRATCH_MNT
+        if ! _mount | grep $SCRATCH_DEV | grep -q $SCRATCH_MNT
+        then
+            _fail "\$SCRATCH_DEV is mounted but not on \$SCRATCH_MNT -
aborting"
+        fi
+        $UMOUNT_PROG $SCRATCH_DEV
+    fi
+
+    _scratch_mkfs
+    _scratch_mount
+
+    testdir=$SCRATCH_MNT
+}
+
+
 #
 # Warning for UDF and NFS:
 # this function calls _setup_udf_scratchdir and _setup_udf_scratchdir
@@ -1535,6 +1584,9 @@ _setup_testdir()
     nfs*)
     _setup_nfs_scratchdir
     ;;
+    tmpfs)
+    _setup_tmpfs_scratchdir
+    ;;
     *)
     testdir=$TEST_DIR
     ;;
@@ -1552,6 +1604,10 @@ _cleanup_testdir()
     # umount testdir as it is $SCRATCH_MNT which could be used by xfs next
     [ -n "$testdir" ] && $UMOUNT_PROG $testdir
     ;;
+    tmpfs)
+    # umount testdir since it is actually a scrath mount
+    [ -n "$testdir" ] && $UMOUNT_PROG $testdir
+    ;;
     *)
     # do nothing, testdir is $TEST_DIR
     :

Signed-off-by: Boris Ranto <ranto.boris at gmail.com>
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