[PATCH] btrfs-progs: tests: add misc test for enqueue parameter

[An Long <lan@suse.com>]

The exclusive ops will not start if there's one already running. The
enqueue parameter allows operations to be queued.

Signed-off-by: An Long <lan@suse.com>
---
 .../misc-tests/048-enqueue-parameter/test.sh  | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100755 tests/misc-tests/048-enqueue-parameter/test.sh

diff --git a/tests/misc-tests/048-enqueue-parameter/test.sh b/tests/misc-tests/048-enqueue-parameter/test.sh
new file mode 100755
index 00000000..4be7d466
--- /dev/null
+++ b/tests/misc-tests/048-enqueue-parameter/test.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+# Check if --enqueue can enqueueing of the operations correctly
+
+source "$TEST_TOP/common"
+
+check_prereq mkfs.btrfs
+check_prereq btrfs
+check_global_prereq fallocate
+
+setup_loopdevs 3
+prepare_loopdevs
+dev1=${loopdevs[1]}
+dev2=${loopdevs[2]}
+dev3=${loopdevs[3]}
+run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$dev1"
+run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$dev2"
+run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$dev3"
+run_check $SUDO_HELPER mount "$dev1" "$TEST_MNT"
+run_check $SUDO_HELPER "$TOP/btrfs" device add -f "$dev2" "$TEST_MNT"
+
+test_run_commands() {
+        run_check $SUDO_HELPER "$TOP/btrfs" balance start --enqueue --full-balance "$TEST_MNT" &
+        run_check $SUDO_HELPER "$TOP/btrfs" filesystem resize --enqueue -100M "$TEST_MNT" &
+        run_check $SUDO_HELPER "$TOP/btrfs" device add --enqueue -f "$dev3" "$TEST_MNT" &
+        run_check $SUDO_HELPER "$TOP/btrfs" device delete --enqueue "$dev2" "$TEST_MNT" &
+}
+
+get_fs_uuid() {
+        run_check_stdout "$TOP/btrfs" inspect-internal dump-super "$1" | \
+                grep '^fsid' | awk '{print $2}'
+}
+
+fsid=$(get_fs_uuid "$dev1")
+if ! [ -f "/sys/fs/btrfs/$fsid/exclusive_operation" ]; then
+        run_check_umount_test_dev "$TEST_MNT"
+        cleanup_loopdevs
+        _not_run "kernel does not support exclusive_operation"
+        exit
+fi
+
+# Generate 1G data, for enough balance time for exclusive_operation
+for i in $(seq 1 5); do
+        run_check $SUDO_HELPER fallocate -l 200M "$TEST_MNT/file$i"
+done
+
+# Do btrfs balance in background, then try commands with enqueue parameter
+run_check $SUDO_HELPER "$TOP/btrfs" balance start --full-balance "$TEST_MNT" &
+test_run_commands
+wait
+
+run_check_umount_test_dev "$TEST_MNT"
+cleanup_loopdevs
-- 
2.26.2