/*
   * sysfs.h - sysfs support declarations.
   *
   * Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation.
   * Copyright (C) 2014 HGST, Inc., a Western Digital Company.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
   */
  
  #ifndef _NILFS_SYSFS_H
  #define _NILFS_SYSFS_H
  
  #include <linux/sysfs.h>
  
  #define NILFS_ROOT_GROUP_NAME	"nilfs2"

  /*
   * struct nilfs_sysfs_dev_subgroups - device subgroup kernel objects
   * @sg_superblock_kobj: /sys/fs/<nilfs>/<device>/superblock
   * @sg_superblock_kobj_unregister: completion state

   * @sg_segctor_kobj: /sys/fs/<nilfs>/<device>/segctor
   * @sg_segctor_kobj_unregister: completion state

   * @sg_mounted_snapshots_kobj: /sys/fs/<nilfs>/<device>/mounted_snapshots
   * @sg_mounted_snapshots_kobj_unregister: completion state

   * @sg_checkpoints_kobj: /sys/fs/<nilfs>/<device>/checkpoints
   * @sg_checkpoints_kobj_unregister: completion state

   * @sg_segments_kobj: /sys/fs/<nilfs>/<device>/segments
   * @sg_segments_kobj_unregister: completion state

   */
  struct nilfs_sysfs_dev_subgroups {
  	/* /sys/fs/<nilfs>/<device>/superblock */
  	struct kobject sg_superblock_kobj;
  	struct completion sg_superblock_kobj_unregister;

  
  	/* /sys/fs/<nilfs>/<device>/segctor */
  	struct kobject sg_segctor_kobj;
  	struct completion sg_segctor_kobj_unregister;

  	/* /sys/fs/<nilfs>/<device>/mounted_snapshots */
  	struct kobject sg_mounted_snapshots_kobj;
  	struct completion sg_mounted_snapshots_kobj_unregister;

  	/* /sys/fs/<nilfs>/<device>/checkpoints */
  	struct kobject sg_checkpoints_kobj;
  	struct completion sg_checkpoints_kobj_unregister;

  	/* /sys/fs/<nilfs>/<device>/segments */
  	struct kobject sg_segments_kobj;
  	struct completion sg_segments_kobj_unregister;

  };

  #define NILFS_COMMON_ATTR_STRUCT(name) \
  struct nilfs_##name##_attr { \
  	struct attribute attr; \
  	ssize_t (*show)(struct kobject *, struct attribute *, \
  			char *); \
  	ssize_t (*store)(struct kobject *, struct attribute *, \
  			 const char *, size_t); \

  }

  
  NILFS_COMMON_ATTR_STRUCT(feature);

  #define NILFS_DEV_ATTR_STRUCT(name) \
  struct nilfs_##name##_attr { \
  	struct attribute attr; \
  	ssize_t (*show)(struct nilfs_##name##_attr *, struct the_nilfs *, \
  			char *); \
  	ssize_t (*store)(struct nilfs_##name##_attr *, struct the_nilfs *, \
  			 const char *, size_t); \

  }

  
  NILFS_DEV_ATTR_STRUCT(dev);

  NILFS_DEV_ATTR_STRUCT(segments);

  NILFS_DEV_ATTR_STRUCT(mounted_snapshots);

  NILFS_DEV_ATTR_STRUCT(checkpoints);

  NILFS_DEV_ATTR_STRUCT(superblock);

  NILFS_DEV_ATTR_STRUCT(segctor);

  #define NILFS_CP_ATTR_STRUCT(name) \
  struct nilfs_##name##_attr { \
  	struct attribute attr; \
  	ssize_t (*show)(struct nilfs_##name##_attr *, struct nilfs_root *, \
  			char *); \
  	ssize_t (*store)(struct nilfs_##name##_attr *, struct nilfs_root *, \
  			 const char *, size_t); \

  }

  
  NILFS_CP_ATTR_STRUCT(snapshot);

  #define NILFS_ATTR(type, name, mode, show, store) \
  	static struct nilfs_##type##_attr nilfs_##type##_attr_##name = \
  		__ATTR(name, mode, show, store)
  
  #define NILFS_INFO_ATTR(type, name) \
  	NILFS_ATTR(type, name, 0444, NULL, NULL)
  #define NILFS_RO_ATTR(type, name) \
  	NILFS_ATTR(type, name, 0444, nilfs_##type##_##name##_show, NULL)
  #define NILFS_RW_ATTR(type, name) \
  	NILFS_ATTR(type, name, 0644, \
  		    nilfs_##type##_##name##_show, \
  		    nilfs_##type##_##name##_store)
  
  #define NILFS_FEATURE_INFO_ATTR(name) \
  	NILFS_INFO_ATTR(feature, name)
  #define NILFS_FEATURE_RO_ATTR(name) \
  	NILFS_RO_ATTR(feature, name)
  #define NILFS_FEATURE_RW_ATTR(name) \
  	NILFS_RW_ATTR(feature, name)

  #define NILFS_DEV_INFO_ATTR(name) \
  	NILFS_INFO_ATTR(dev, name)
  #define NILFS_DEV_RO_ATTR(name) \
  	NILFS_RO_ATTR(dev, name)
  #define NILFS_DEV_RW_ATTR(name) \
  	NILFS_RW_ATTR(dev, name)

  #define NILFS_SEGMENTS_RO_ATTR(name) \
  	NILFS_RO_ATTR(segments, name)
  #define NILFS_SEGMENTS_RW_ATTR(name) \
  	NILFS_RW_ATTR(segs_info, name)

  #define NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(name) \
  	NILFS_RO_ATTR(mounted_snapshots, name)

  #define NILFS_CHECKPOINTS_RO_ATTR(name) \
  	NILFS_RO_ATTR(checkpoints, name)
  #define NILFS_CHECKPOINTS_RW_ATTR(name) \
  	NILFS_RW_ATTR(checkpoints, name)

  #define NILFS_SNAPSHOT_INFO_ATTR(name) \
  	NILFS_INFO_ATTR(snapshot, name)
  #define NILFS_SNAPSHOT_RO_ATTR(name) \
  	NILFS_RO_ATTR(snapshot, name)
  #define NILFS_SNAPSHOT_RW_ATTR(name) \
  	NILFS_RW_ATTR(snapshot, name)

  #define NILFS_SUPERBLOCK_RO_ATTR(name) \
  	NILFS_RO_ATTR(superblock, name)
  #define NILFS_SUPERBLOCK_RW_ATTR(name) \
  	NILFS_RW_ATTR(superblock, name)

  #define NILFS_SEGCTOR_INFO_ATTR(name) \
  	NILFS_INFO_ATTR(segctor, name)
  #define NILFS_SEGCTOR_RO_ATTR(name) \
  	NILFS_RO_ATTR(segctor, name)
  #define NILFS_SEGCTOR_RW_ATTR(name) \
  	NILFS_RW_ATTR(segctor, name)

  #define NILFS_FEATURE_ATTR_LIST(name) \
  	(&nilfs_feature_attr_##name.attr)

  #define NILFS_DEV_ATTR_LIST(name) \
  	(&nilfs_dev_attr_##name.attr)

  #define NILFS_SEGMENTS_ATTR_LIST(name) \
  	(&nilfs_segments_attr_##name.attr)

  #define NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(name) \
  	(&nilfs_mounted_snapshots_attr_##name.attr)

  #define NILFS_CHECKPOINTS_ATTR_LIST(name) \
  	(&nilfs_checkpoints_attr_##name.attr)

  #define NILFS_SNAPSHOT_ATTR_LIST(name) \
  	(&nilfs_snapshot_attr_##name.attr)

  #define NILFS_SUPERBLOCK_ATTR_LIST(name) \
  	(&nilfs_superblock_attr_##name.attr)

  #define NILFS_SEGCTOR_ATTR_LIST(name) \
  	(&nilfs_segctor_attr_##name.attr)

  
  #endif /* _NILFS_SYSFS_H */