Check O_DIRECT support before testing direct I/O

Some filesystems do not support O_DIRECT.  Check whether TEST_DIR supports
it by running xfs_io with -d flag.

Signed-off-by: Junho Ryu <jayr@google.com>
Signed-off-by: Dushan Tcholich <dusanc@gmail.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

common/rc

@@ -1402,6 +1402,7 @@ _require_aiodio()
         AIO_TEST=src/aio-dio-regress/$1
         [ -x $AIO_TEST ] || _notrun "$AIO_TEST not built"
     fi
+    _require_odirect
 }
 
 # run an aio-dio program
@@ -1530,6 +1531,17 @@ _require_xfs_io_command()
 		_notrun "xfs_io $command failed (old kernel/wrong fs?)"
 }
 
+# check that kernel and filesystem support direct I/O
+_require_odirect()
+{
+       testfile=$TEST_DIR/$$.direct
+       $XFS_IO_PROG -F -f -d -c "pwrite 0 20k" $testfile > /dev/null 2>&1
+       if [ $? -ne 0 ]; then
+               _notrun "O_DIRECT is not supported"
+       fi
+       rm -f $testfile 2>&1 > /dev/null
+}
+
 # Check that a fs has enough free space (in 1024b blocks)
 #
 _require_fs_space()

tests/generic/091

@@ -39,6 +39,7 @@ trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15
 _supported_fs generic
 _supported_os Linux
 _require_test
+_require_odirect
 
 rm -f $seqres.full
 

tests/generic/130

@@ -50,6 +50,7 @@ _supported_os Linux IRIX
 
 _require_scratch
 _require_sparse_files
+_require_odirect
 
 _scratch_mkfs >/dev/null 2>&1
 _scratch_mount

tests/generic/133

@@ -39,6 +39,7 @@ trap "exit \$status" 0 1 2 3 15
 _supported_fs generic
 _supported_os Linux IRIX
 _require_test
+_require_odirect
 
 echo "Buffered writer, buffered reader"
 $XFS_IO_PROG -f -d -c 'pwrite -b 64k 0 512m' $TEST_DIR/io_test > /dev/null

tests/generic/135

@@ -39,6 +39,7 @@ trap "exit \$status" 0 1 2 3 15
 _supported_fs generic
 _supported_os Linux IRIX
 
+_require_odirect
 _require_scratch
 _scratch_mkfs >/dev/null 2>&1
 

tests/generic/226

@@ -37,6 +37,7 @@ trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15
 _supported_fs generic
 _supported_os Linux IRIX
 _require_scratch
+_require_odirect
 
 # real QA test starts here
 rm -f $seqres.full

tests/generic/263

@@ -39,6 +39,7 @@ trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15
 _supported_fs generic
 _supported_os Linux
 _require_test
+_require_odirect
 
 rm -f $seqres.full
 

tests/generic/299

@@ -43,6 +43,7 @@ _supported_fs generic
 _supported_os Linux
 _need_to_be_root
 _require_scratch
+_require_odirect
 
 NUM_JOBS=$((4*LOAD_FACTOR))
 BLK_DEV_SIZE=`blockdev --getsz $SCRATCH_DEV`

tests/generic/300

@@ -43,6 +43,7 @@ _supported_fs generic
 _supported_os Linux
 _need_to_be_root
 _require_scratch
+_require_odirect
 
 # xfs_io is not required for this test, but it's the best way to verify
 # the test system supports fallocate() for allocation and hole punching