xfstests: add _require_sparse_files

Add a helper to check if the filesystem supports sparse files.  This is
used to guard tests that exercise sparse file functionality and would
take forever on filesystems that have to zero all blocks on extending
truncates.

Unfortunately there's no good way to autodetect this functionality, so
just implement it as a blacklist for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

014

@@ -47,6 +47,7 @@ _cleanup()
 _supported_fs generic
 _supported_os IRIX Linux
 
+_require_sparse_files
 _setup_testdir
 
 echo "brevity is wit..."

129

@@ -52,8 +52,10 @@ echo_and_run()
 _supported_fs generic
 _supported_os Linux
 
-_setup_testdir
 _require_scratch
+_require_sparse_files
+
+_setup_testdir
 
 _scratch_mkfs >/dev/null 2>&1
 _scratch_mount "-o nosuid"

130

@@ -55,8 +55,10 @@ _cleanup()
 _supported_fs generic
 _supported_os Linux IRIX
 
-_setup_testdir
 _require_scratch
+_require_sparse_files
+
+_setup_testdir
 
 _scratch_mkfs >/dev/null 2>&1
 _scratch_mount

239

@@ -45,6 +45,8 @@ _cleanup()
 _supported_fs generic
 _supported_os Linux
 
+_require_sparse_files
+
 AIO_TEST=src/aio-dio-regress/aio-dio-hole-filling-race
 [ -x $AIO_TEST ] || _notrun "$AIO_TEST not built"
 

240

@@ -48,6 +48,8 @@ _cleanup()
 _supported_fs generic
 _supported_os Linux
 
+_require_sparse_files
+
 echo "Silence is golden."
 
 # real QA test starts here

common.rc

@@ -857,6 +857,22 @@ _require_fs_space()
 		_notrun "This test requires at least ${GB}GB free on $MNT to run"
 }
 
+#
+# Check if the filesystem supports sparse files.
+#
+# Unfortunately there is no better way to do this than a manual black list.
+#
+_require_sparse_files()
+{
+    case $FSTYP in
+    hfsplus)
+        _notrun "Sparse files not supported by this filesystem type: $FSTYP"
+	;;
+    *)
+        ;;
+    esac
+}
+
 # check that a FS on a device is mounted
 # if so, return mount point
 #