btrfs-progs: tests: check if kernel has btrfs support

Add some sanity checks, reported among other issues via bugzilla.

References: https://bugzilla.kernel.org/show_bug.cgi?id=177141
Signed-off-by: David Sterba <dsterba@suse.com>

tests/cli-tests.sh

@@ -20,6 +20,7 @@ export TEST_DEV
 rm -f $RESULTS
 
 check_prereq btrfs
+check_kernel_support
 
 # The tests are driven by their custom script called 'test.sh'
 

tests/common

@@ -280,10 +280,20 @@ run_check_umount_test_dev()
 	run_check $SUDO_HELPER umount "$@" "$TEST_DEV"
 }
 
+check_kernel_support()
+{
+	if ! grep -iq 'btrfs' /proc/filesystems; then
+		echo "WARNING: btrfs filesystem not listed in /proc/filesystems, some tests might fail"
+		return 1
+	fi
+	return 0
+}
+
 init_env()
 {
 	TEST_MNT="${TEST_MNT:-$TOP/tests/mnt}"
 	export TEST_MNT
 	mkdir -p "$TEST_MNT" || { echo "Failed mkdir -p $TEST_MNT"; exit 1; }
+
 }
 init_env

tests/convert-tests.sh

@@ -21,6 +21,8 @@ export TEST_DEV
 
 rm -f $RESULTS
 
+check_kernel_support
+
 run_one_test() {
 	local testdir
 	local testname

tests/fsck-tests.sh

@@ -23,6 +23,7 @@ rm -f $RESULTS
 check_prereq btrfs-corrupt-block
 check_prereq btrfs-image
 check_prereq btrfs
+check_kernel_support
 
 run_one_test() {
 	local testname

tests/misc-tests.sh

@@ -24,6 +24,7 @@ check_prereq btrfs-corrupt-block
 check_prereq btrfs-image
 check_prereq btrfstune
 check_prereq btrfs
+check_kernel_support
 
 # The tests are driven by their custom script called 'test.sh'
 

tests/mkfs-tests.sh

@@ -21,6 +21,7 @@ rm -f $RESULTS
 
 check_prereq mkfs.btrfs
 check_prereq btrfs
+check_kernel_support
 
 # The tests are driven by their custom script called 'test.sh'