1 #ifndef _BTRFS_SYSFS_H_
2 #define _BTRFS_SYSFS_H_
4 enum btrfs_feature_set {
11 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
13 .attr = { .name = __stringify(_name), .mode = _mode }, \
18 #define BTRFS_ATTR_RW(_name, _mode, _show, _store) \
19 static struct kobj_attribute btrfs_attr_##_name = \
20 __INIT_KOBJ_ATTR(_name, _mode, _show, _store)
21 #define BTRFS_ATTR(_name, _mode, _show) \
22 BTRFS_ATTR_RW(_name, _mode, _show, NULL)
23 #define BTRFS_ATTR_PTR(_name) (&btrfs_attr_##_name.attr)
25 struct btrfs_feature_attr {
26 struct kobj_attribute kobj_attr;
27 enum btrfs_feature_set feature_set;
31 #define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit) \
32 static struct btrfs_feature_attr btrfs_attr_##_name = { \
33 .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
34 btrfs_feature_attr_show, NULL), \
35 .feature_set = _feature_set, \
36 .feature_bit = _prefix ##_## _feature_bit, \
38 #define BTRFS_FEAT_ATTR_PTR(_name) (&btrfs_attr_##_name.kobj_attr.attr)
40 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
41 BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
42 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
43 BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature)
44 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
45 BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
47 /* convert from attribute */
48 #define to_btrfs_feature_attr(a) \
49 container_of(a, struct btrfs_feature_attr, kobj_attr)
50 #define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
51 #define attr_to_btrfs_feature_attr(a) \
52 to_btrfs_feature_attr(attr_to_btrfs_attr(a))
53 #endif /* _BTRFS_SYSFS_H_ */