[PATCH v2] btrfs-progs: fix zstd compression test on a kernel without ztsd support

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The test-case 'misc-tests/025-zstd-compression' is failing on a kernel or
btrfs binary built without zstd compression support.

Check if zstd compression is supported by either the kernel or the btrfs
binary and if not skip the test-case.

Signed-off-by: Johannes Thumshirn <jthumshirn@xxxxxxx>

---
Changes to v1:
- Also check $TOP/btrfs not just the kernel for zstd support (Dave)
---
 tests/misc-tests/025-zstd-compression/test.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/misc-tests/025-zstd-compression/test.sh b/tests/misc-tests/025-zstd-compression/test.sh
index 22795d27500e..d967e358fcb2 100755
--- a/tests/misc-tests/025-zstd-compression/test.sh
+++ b/tests/misc-tests/025-zstd-compression/test.sh
@@ -6,6 +6,16 @@ source "$TEST_TOP/common"
 check_prereq btrfs
 check_global_prereq md5sum
 
+if ! [ -f "/sys/fs/btrfs/features/compress_zstd" ]; then
+       _not_run "kernel does not support zstd compression feature"
+       exit
+fi
+
+if ! ldd "$TOP/btrfs" | grep -q zstd; then
+	_not_run "btrfs is not compiled with zstd compression support"
+	exit
+fi
+
 # Extract the test image
 image=$(extract_image compress.raw.xz)
 
-- 
2.16.4




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