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kernel/linux-rt-4.4.41/fs/btrfs/sysfs.h 2.98 KB
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  #ifndef _BTRFS_SYSFS_H_
  #define _BTRFS_SYSFS_H_
  
  /*
   * Data exported through sysfs
   */
  extern u64 btrfs_debugfs_test;
  
  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, _show, _store)			\
  	static struct kobj_attribute btrfs_attr_##_name =		\
  			__INIT_KOBJ_ATTR(_name, 0644, _show, _store)
  
  #define BTRFS_ATTR(_name, _show)					\
  	static struct kobj_attribute btrfs_attr_##_name =		\
  			__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
  
  #define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)
  
  #define BTRFS_RAID_ATTR(_name, _show)					\
  	static struct kobj_attribute btrfs_raid_attr_##_name =		\
  			__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
  
  #define BTRFS_RAID_ATTR_PTR(_name)    (&btrfs_raid_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 */
  static inline struct btrfs_feature_attr *
  to_btrfs_feature_attr(struct kobj_attribute *a)
  {
  	return container_of(a, struct btrfs_feature_attr, kobj_attr);
  }
  
  static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
  {
  	return container_of(attr, struct kobj_attribute, attr);
  }
  
  static inline struct btrfs_feature_attr *
  attr_to_btrfs_feature_attr(struct attribute *attr)
  {
  	return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
  }
  
  char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
  extern const char * const btrfs_feature_set_names[3];
  extern struct kobj_type space_info_ktype;
  extern struct kobj_type btrfs_raid_ktype;
  int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
  		struct btrfs_device *one_device);
  int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
                  struct btrfs_device *one_device);
  int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
  				struct kobject *parent);
  int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
  void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
  #endif /* _BTRFS_SYSFS_H_ */