LXR linux/fs/nilfs2/sysfs.h

   1/*
   2 * sysfs.h - sysfs support declarations.
   3 *
   4 * Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation.
   5 * Copyright (C) 2014 HGST, Inc., a Western Digital Company.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
  18 */
  19
  20#ifndef _NILFS_SYSFS_H
  21#define _NILFS_SYSFS_H
  22
  23#include <linux/sysfs.h>
  24
  25#define NILFS_ROOT_GROUP_NAME   "nilfs2"
  26
  27/*
  28 * struct nilfs_sysfs_dev_subgroups - device subgroup kernel objects
  29 * @sg_superblock_kobj: /sys/fs/<nilfs>/<device>/superblock
  30 * @sg_superblock_kobj_unregister: completion state
  31 * @sg_segctor_kobj: /sys/fs/<nilfs>/<device>/segctor
  32 * @sg_segctor_kobj_unregister: completion state
  33 * @sg_mounted_snapshots_kobj: /sys/fs/<nilfs>/<device>/mounted_snapshots
  34 * @sg_mounted_snapshots_kobj_unregister: completion state
  35 * @sg_checkpoints_kobj: /sys/fs/<nilfs>/<device>/checkpoints
  36 * @sg_checkpoints_kobj_unregister: completion state
  37 * @sg_segments_kobj: /sys/fs/<nilfs>/<device>/segments
  38 * @sg_segments_kobj_unregister: completion state
  39 */
  40struct nilfs_sysfs_dev_subgroups {
  41        /* /sys/fs/<nilfs>/<device>/superblock */
  42        struct kobject sg_superblock_kobj;
  43        struct completion sg_superblock_kobj_unregister;
  44
  45        /* /sys/fs/<nilfs>/<device>/segctor */
  46        struct kobject sg_segctor_kobj;
  47        struct completion sg_segctor_kobj_unregister;
  48
  49        /* /sys/fs/<nilfs>/<device>/mounted_snapshots */
  50        struct kobject sg_mounted_snapshots_kobj;
  51        struct completion sg_mounted_snapshots_kobj_unregister;
  52
  53        /* /sys/fs/<nilfs>/<device>/checkpoints */
  54        struct kobject sg_checkpoints_kobj;
  55        struct completion sg_checkpoints_kobj_unregister;
  56
  57        /* /sys/fs/<nilfs>/<device>/segments */
  58        struct kobject sg_segments_kobj;
  59        struct completion sg_segments_kobj_unregister;
  60};
  61
  62#define NILFS_COMMON_ATTR_STRUCT(name) \
  63struct nilfs_##name##_attr { \
  64        struct attribute attr; \
  65        ssize_t (*show)(struct kobject *, struct attribute *, \
  66                        char *); \
  67        ssize_t (*store)(struct kobject *, struct attribute *, \
  68                         const char *, size_t); \
  69};
  70
  71NILFS_COMMON_ATTR_STRUCT(feature);
  72
  73#define NILFS_DEV_ATTR_STRUCT(name) \
  74struct nilfs_##name##_attr { \
  75        struct attribute attr; \
  76        ssize_t (*show)(struct nilfs_##name##_attr *, struct the_nilfs *, \
  77                        char *); \
  78        ssize_t (*store)(struct nilfs_##name##_attr *, struct the_nilfs *, \
  79                         const char *, size_t); \
  80};
  81
  82NILFS_DEV_ATTR_STRUCT(dev);
  83NILFS_DEV_ATTR_STRUCT(segments);
  84NILFS_DEV_ATTR_STRUCT(mounted_snapshots);
  85NILFS_DEV_ATTR_STRUCT(checkpoints);
  86NILFS_DEV_ATTR_STRUCT(superblock);
  87NILFS_DEV_ATTR_STRUCT(segctor);
  88
  89#define NILFS_CP_ATTR_STRUCT(name) \
  90struct nilfs_##name##_attr { \
  91        struct attribute attr; \
  92        ssize_t (*show)(struct nilfs_##name##_attr *, struct nilfs_root *, \
  93                        char *); \
  94        ssize_t (*store)(struct nilfs_##name##_attr *, struct nilfs_root *, \
  95                         const char *, size_t); \
  96};
  97
  98NILFS_CP_ATTR_STRUCT(snapshot);
  99
 100#define NILFS_ATTR(type, name, mode, show, store) \
 101        static struct nilfs_##type##_attr nilfs_##type##_attr_##name = \
 102                __ATTR(name, mode, show, store)
 103
 104#define NILFS_INFO_ATTR(type, name) \
 105        NILFS_ATTR(type, name, 0444, NULL, NULL)
 106#define NILFS_RO_ATTR(type, name) \
 107        NILFS_ATTR(type, name, 0444, nilfs_##type##_##name##_show, NULL)
 108#define NILFS_RW_ATTR(type, name) \
 109        NILFS_ATTR(type, name, 0644, \
 110                    nilfs_##type##_##name##_show, \
 111                    nilfs_##type##_##name##_store)
 112
 113#define NILFS_FEATURE_INFO_ATTR(name) \
 114        NILFS_INFO_ATTR(feature, name)
 115#define NILFS_FEATURE_RO_ATTR(name) \
 116        NILFS_RO_ATTR(feature, name)
 117#define NILFS_FEATURE_RW_ATTR(name) \
 118        NILFS_RW_ATTR(feature, name)
 119
 120#define NILFS_DEV_INFO_ATTR(name) \
 121        NILFS_INFO_ATTR(dev, name)
 122#define NILFS_DEV_RO_ATTR(name) \
 123        NILFS_RO_ATTR(dev, name)
 124#define NILFS_DEV_RW_ATTR(name) \
 125        NILFS_RW_ATTR(dev, name)
 126
 127#define NILFS_SEGMENTS_RO_ATTR(name) \
 128        NILFS_RO_ATTR(segments, name)
 129#define NILFS_SEGMENTS_RW_ATTR(name) \
 130        NILFS_RW_ATTR(segs_info, name)
 131
 132#define NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(name) \
 133        NILFS_RO_ATTR(mounted_snapshots, name)
 134
 135#define NILFS_CHECKPOINTS_RO_ATTR(name) \
 136        NILFS_RO_ATTR(checkpoints, name)
 137#define NILFS_CHECKPOINTS_RW_ATTR(name) \
 138        NILFS_RW_ATTR(checkpoints, name)
 139
 140#define NILFS_SNAPSHOT_INFO_ATTR(name) \
 141        NILFS_INFO_ATTR(snapshot, name)
 142#define NILFS_SNAPSHOT_RO_ATTR(name) \
 143        NILFS_RO_ATTR(snapshot, name)
 144#define NILFS_SNAPSHOT_RW_ATTR(name) \
 145        NILFS_RW_ATTR(snapshot, name)
 146
 147#define NILFS_SUPERBLOCK_RO_ATTR(name) \
 148        NILFS_RO_ATTR(superblock, name)
 149#define NILFS_SUPERBLOCK_RW_ATTR(name) \
 150        NILFS_RW_ATTR(superblock, name)
 151
 152#define NILFS_SEGCTOR_INFO_ATTR(name) \
 153        NILFS_INFO_ATTR(segctor, name)
 154#define NILFS_SEGCTOR_RO_ATTR(name) \
 155        NILFS_RO_ATTR(segctor, name)
 156#define NILFS_SEGCTOR_RW_ATTR(name) \
 157        NILFS_RW_ATTR(segctor, name)
 158
 159#define NILFS_FEATURE_ATTR_LIST(name) \
 160        (&nilfs_feature_attr_##name.attr)
 161#define NILFS_DEV_ATTR_LIST(name) \
 162        (&nilfs_dev_attr_##name.attr)
 163#define NILFS_SEGMENTS_ATTR_LIST(name) \
 164        (&nilfs_segments_attr_##name.attr)
 165#define NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(name) \
 166        (&nilfs_mounted_snapshots_attr_##name.attr)
 167#define NILFS_CHECKPOINTS_ATTR_LIST(name) \
 168        (&nilfs_checkpoints_attr_##name.attr)
 169#define NILFS_SNAPSHOT_ATTR_LIST(name) \
 170        (&nilfs_snapshot_attr_##name.attr)
 171#define NILFS_SUPERBLOCK_ATTR_LIST(name) \
 172        (&nilfs_superblock_attr_##name.attr)
 173#define NILFS_SEGCTOR_ATTR_LIST(name) \
 174        (&nilfs_segctor_attr_##name.attr)
 175
 176#endif /* _NILFS_SYSFS_H */
 177