From 24c58f2d973c855cc0af0a12e225fd2f07b342d4 Mon Sep 17 00:00:00 2001
From: Anand Jain <anand.jain@oracle.com>
Date: Thu, 2 Nov 2023 19:28:19 +0800
Subject: common/btrfs: add helper _has_btrfs_sysfs_feature_attr

With this helper, btrfs test cases can now check if a particular feature
is implemented in the kernel.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>
---
 common/btrfs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'common')

diff --git a/common/btrfs b/common/btrfs
index c3bffd2a..fbc26181 100644
--- a/common/btrfs
+++ b/common/btrfs
@@ -753,3 +753,15 @@ _require_scratch_enable_simple_quota()
 					_notrun "simple quotas not available"
 	_scratch_unmount
 }
+
+_has_btrfs_sysfs_feature_attr()
+{
+	local feature_attr=$1
+
+	[ -z $feature_attr ] && \
+		_fail "Missing feature name argument for _has_btrfs_sysfs_attr"
+
+	modprobe btrfs &> /dev/null
+
+	test -e /sys/fs/btrfs/features/$feature_attr
+}
-- 
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