[PATCH 2/2 v2] btrfs-progs: fix misc-test/029 provide device for mount

[Anand Jain <anand.jain@oracle.com>]

The mount fails with 'file exists' error. Fix it by providing the device
name.

$ make TEST=029\* test-misc
    [TEST]   misc-tests.sh
    [TEST/misc]   029-send-p-different-mountpoints
failed: mount -t btrfs -o subvol=subv1 /btrfs-progs/tests//test.img /btrfs-progs/tests/misc-tests/029-send-p-different-mountpoints/subvol_mnt
test failed for case 029-send-p-different-mountpoints
make: *** [test-misc] Error 1

====== RUN CHECK mount -t btrfs -o subvol=subv1
/btrfs-progs/tests//test.img
/btrfs-progs/tests/misc-tests/029-send-p-different-mountpoints/subvol_mnt
mount: mount /dev/loop1 on
/btrfs-progs/tests/misc-tests/029-send-p-different-mountpoints/subvol_mnt
failed: File exists
failed: mount -t btrfs -o subvol=subv1 /btrfs-progs/tests//test.img
/btrfs-progs/tests/misc-tests/029-send-p-different-mountpoints/subvol_mnt
test failed for case 029-send-p-different-mountpoints

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---

v2: use readlink to sanitize the TEST_DEV path
    update change log

 tests/misc-tests/029-send-p-different-mountpoints/test.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/misc-tests/029-send-p-different-mountpoints/test.sh b/tests/misc-tests/029-send-p-different-mountpoints/test.sh
index a478b3d26495..0ab98f93416d 100755
--- a/tests/misc-tests/029-send-p-different-mountpoints/test.sh
+++ b/tests/misc-tests/029-send-p-different-mountpoints/test.sh
@@ -19,8 +19,9 @@ run_mayfail $SUDO_HELPER mkdir -p "$SUBVOL_MNT" ||
 run_check_mkfs_test_dev
 run_check_mount_test_dev
 
+lodev=$(losetup  | grep $(readlink -f ${TEST_DEV}) | awk '{print $1}')
 run_check $SUDO_HELPER "$TOP/btrfs" subvolume create "$TEST_MNT/subv1"
-run_check $SUDO_HELPER mount -t btrfs -o subvol=subv1 "$TEST_DEV" "$SUBVOL_MNT"
+run_check $SUDO_HELPER mount -t btrfs -o subvol=subv1 "$lodev" "$SUBVOL_MNT"
 
 run_check $SUDO_HELPER "$TOP/btrfs" subvolume create "$TEST_MNT/test-subvol"
 run_check $SUDO_HELPER "$TOP/btrfs" subvolume snapshot -r \
-- 
1.8.3.1