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btrfs: add read-only check to sysfs handler of features
author
David Sterba
<dsterba@suse.cz>
Fri, 23 Jan 2015 17:43:31 +0000
(18:43 +0100)
committer
David Sterba
<dsterba@suse.com>
Fri, 6 May 2016 13:22:49 +0000
(15:22 +0200)
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
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diff --git
a/fs/btrfs/sysfs.c
b/fs/btrfs/sysfs.c
index
539e7b5
..
6a6bb60
100644
(file)
--- 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;