[PATCH] xfstests generic/285: find the correct block device name

[Eryu Guan <eguan@xxxxxxxxxx>]

If $TEST_DEV is a symlink to a device, most likely a lvm, generic/285
fails with the following error

+./tests/generic/285: line 53: 
/sys/fs/ext4/testvg-testlv1/extent_max_zeroout_kb: No such file or directory

Here TEST_DEV is /dev/mapper/testvg-testlv1

Fix it by following the link to find the correct device name.

Signed-off-by: Eryu Guan <eguan@xxxxxxxxxx>
---
 tests/generic/285 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/generic/285 b/tests/generic/285
index 8078b1c..be31852 100755
--- a/tests/generic/285
+++ b/tests/generic/285
@@ -48,7 +48,7 @@ BASE_TEST_FILE=$TEST_DIR/seek_sanity_testfile
 
 # Disable extent zeroing for ext4 as that change where holes are created
 if [ "$FSTYP" = "ext4" ]; then
-       DEV=`basename $TEST_DEV`
+       DEV=$(basename $(readlink -f $TEST_DEV))
        echo 0 >/sys/fs/ext4/$DEV/extent_max_zeroout_kb
 fi
 
-- 
1.8.3.1