From: David Sterba <dsterba@suse.cz>
Date: Fri, 23 Jan 2015 17:43:31 +0000 (+0100)
Subject: btrfs: add read-only check to sysfs handler of features
X-Git-Tag: v4.7-rc1~85^2~1^2~3^2~18
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ee6111386a1b304f8bf589d36810d53e3b27ee20;p=karo-tx-linux.git

btrfs: add read-only check to sysfs handler of features

We don't want to trigger the change on a read-only filesystem, similar
to what the label handler does.

Signed-off-by: David Sterba <dsterba@suse.cz>
---

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 539e7b5e3f86..6a6bb600b1ff 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -120,6 +120,9 @@ static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
 	if (!fs_info)
 		return -EPERM;
 
+	if (fs_info->sb->s_flags & MS_RDONLY)
+		return -EROFS;
+
 	ret = kstrtoul(skip_spaces(buf), 0, &val);
 	if (ret)
 		return ret;