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#ifndef _BTRFS_SYSFS_H_
#define _BTRFS_SYSFS_H_
enum btrfs_feature_set {
FEAT_COMPAT,
FEAT_COMPAT_RO,
FEAT_INCOMPAT,
FEAT_MAX
};
#define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
{ \
.attr = { .name = __stringify(_name), .mode = _mode }, \
.show = _show, \
.store = _store, \
}
#define BTRFS_ATTR_RW(_name, _mode, _show, _store) \
static struct kobj_attribute btrfs_attr_##_name = \
__INIT_KOBJ_ATTR(_name, _mode, _show, _store)
#define BTRFS_ATTR(_name, _mode, _show) \
BTRFS_ATTR_RW(_name, _mode, _show, NULL)
#define BTRFS_ATTR_PTR(_name) (&btrfs_attr_##_name.attr)
struct btrfs_feature_attr {
struct kobj_attribute kobj_attr;
enum btrfs_feature_set feature_set;
u64 feature_bit;
};
#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, \
btrfs_feature_attr_store), \
.feature_set = _feature_set, \
.feature_bit = _prefix ##_## _feature_bit, \
}
#define BTRFS_FEAT_ATTR_PTR(_name) (&btrfs_attr_##_name.kobj_attr.attr)
#define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
#define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature)
#define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
/* convert from attribute */
#define to_btrfs_feature_attr(a) \
container_of(a, struct btrfs_feature_attr, kobj_attr)
#define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
#define attr_to_btrfs_feature_attr(a) \
to_btrfs_feature_attr(attr_to_btrfs_attr(a))
#endif /* _BTRFS_SYSFS_H_ */
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