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authorJeff Mahoney <jeffm@suse.com>2013-11-01 21:07:01 +0400
committerChris Mason <clm@fb.com>2014-01-29 01:19:27 +0400
commitba631941ef09c10e229661219dbd1707e56131d8 (patch)
tree6d06a0adf2a6d4436e8ea3a381269f7b2cf565ab /fs/btrfs/sysfs.h
parent79da4fa4d9dcf8c948ef8b5848f747ef08f6e732 (diff)
downloadlinux-ba631941ef09c10e229661219dbd1707e56131d8.tar.xz
btrfs: add ability to change features via sysfs
This patch adds the ability to change (set/clear) features while the file system is mounted. A bitmask is added for each feature set for the support to set and clear the bits. A message indicating which bit has been set or cleared is issued when it's been changed and also when permission or support for a particular bit has been denied. Since the the attributes can now be writable, we need to introduce another struct attribute to hold the different permissions. If neither set or clear is supported, the file will have 0444 permissions. If either set or clear is supported, the file will have 0644 permissions and the store handler will filter out the write based on the bitmask. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/sysfs.h')
-rw-r--r--fs/btrfs/sysfs.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h
index d7c61bdf04ba..58c4b1f689d6 100644
--- a/fs/btrfs/sysfs.h
+++ b/fs/btrfs/sysfs.h
@@ -31,7 +31,8 @@ struct btrfs_feature_attr {
#define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit) \
static struct btrfs_feature_attr btrfs_attr_##_name = { \
.kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
- btrfs_feature_attr_show, NULL), \
+ btrfs_feature_attr_show, \
+ btrfs_feature_attr_store), \
.feature_set = _feature_set, \
.feature_bit = _prefix ##_## _feature_bit, \
}