[PATCH] xfstests: 251, 260: Use loopdev as fallback if $SCRATCH_DEV doesn't support FITRIM

[Tomas Racek <tracek@xxxxxxxxxx>]

This patch adds an option to test FITRIM even if it's not supported on 
$SCRATCH_DEV. 

Also introduces _create_loop_device and _destroy_loop_device functions to
unify loopback handling.

(depends on patch "Use upstream version of fstrim...")

Signed-off-by: Tomas Racek <tracek@xxxxxxxxxx>
---
 251       | 18 ++++++++++++++++--
 260       | 22 ++++++++++++++++++++--
 common.rc | 14 ++++++++++++++
 3 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/251 b/251
index dbb6ba7..fb88f2a 100755
--- a/251
+++ b/251
@@ -51,13 +51,18 @@ _scratch_mount
 _cleanup()
 {
        rm -rf $tmp
+       if [ -n "$loop" ]; then
+               _scratch_unmount
+               _destroy_loop_device $loop
+               rm $img_file
+       fi
 }
 
 _destroy()
 {
        kill $pids $fstrim_pid 2> /dev/null
        wait $pids $fstrim_pid 2> /dev/null
-       rm -rf $tmp
+       _cleanup
 }
 
 _destroy_fstrim()
@@ -153,7 +158,16 @@ content=$here
 
 # Check for FITRIM support
 echo -n "Checking FITRIM support: "
-_test_batched_discard $SCRATCH_MNT || _notrun "FITRIM not supported on 
$SCRATCH_DEV"
+if ! _test_batched_discard $SCRATCH_MNT; then
+       _scratch_unmount
+       img_file=$TEST_DIR/$$.fs
+       _require_fs_space $TEST_DIR 1048576
+       $XFS_IO_PROG -f -c "truncate 1G" $img_file || _fail "Cannot allocate 
space for $img_file"
+       loop=$(_create_loop_device $img_file)
+       SCRATCH_DEV=$loop
+       _scratch_mkfs >/dev/null 2>&1
+       _scratch_mount
+fi
 echo "done."
 
 mkdir -p $tmp
diff --git a/260 b/260
index ae4740a..cce5137 100755
--- a/260
+++ b/260
@@ -29,7 +29,7 @@ echo "QA output created by $seq"
 here=`pwd`
 tmp=`mktemp -d`
 status=0
-trap "exit \$status" 0 1 2 3 15
+trap "_cleanup; exit \$status" 0 1 3
 chpid=0
 mypid=$$
 
@@ -47,7 +47,25 @@ _require_scratch
 _scratch_mkfs >/dev/null 2>&1
 _scratch_mount
 
-_test_batched_discard $SCRATCH_MNT || _notrun "FITRIM not supported on 
$SCRATCH_DEV"
+_cleanup()
+{
+       if [ -n "$loop" ]; then
+               _scratch_unmount
+               _destroy_loop_device $loop
+               rm $img_file
+       fi
+}
+
+if ! _test_batched_discard $SCRATCH_MNT; then
+       _scratch_unmount
+       img_file=$TEST_DIR/$$.fs
+       _require_fs_space $TEST_DIR 1048576
+       $XFS_IO_PROG -f -c "truncate 1G" $img_file || _fail "Cannot allocate 
space for $img_file"
+       loop=$(_create_loop_device $img_file)
+       SCRATCH_DEV=$loop
+       _scratch_mkfs >/dev/null 2>&1
+       _scratch_mount
+fi
 
 fssize=$(df -k | grep "$SCRATCH_MNT" | grep "$SCRATCH_DEV"  | awk '{print $2}')
 
diff --git a/common.rc b/common.rc
index 966fc93..62b982b 100644
--- a/common.rc
+++ b/common.rc
@@ -1804,6 +1804,20 @@ _test_batched_discard()
        $FSTRIM_PROG ${1} &>/dev/null
 }
 
+_create_loop_device()
+{
+       file=$1
+       dev=`losetup -f`
+       losetup $dev $file || _fail "Cannot associate $file with $dev"
+       echo $dev
+}
+
+_destroy_loop_device()
+{
+       dev=$1
+       losetup -d $dev || _fail "Cannot destroy loop device $dev"
+}
+
 
################################################################################
 
 if [ "$iam" != new -a "$iam" != bench ]
-- 
1.7.11.4