[PATCH 07/21] btrfs: add read-only check to sysfs handler of features

David Sterba
2016-06-03T15:43:01Z

From: David Sterba <dsterba@suse.cz>

commit ee6111386a1b304f8bf589d36810d53e3b27ee20 upstream.

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>
---
fs/btrfs/sysfs.c | 3 +++
1 file changed, 3 insertions(+)

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;
--
2.7.1