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  */
  40 struct 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) \
  63 struct 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
  71 NILFS_COMMON_ATTR_STRUCT(feature);
  72
  73 #define NILFS_DEV_ATTR_STRUCT(name) \
  74 struct 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
  82 NILFS_DEV_ATTR_STRUCT(dev);
  83 NILFS_DEV_ATTR_STRUCT(segments);
  84 NILFS_DEV_ATTR_STRUCT(mounted_snapshots);
  85 NILFS_DEV_ATTR_STRUCT(checkpoints);
  86 NILFS_DEV_ATTR_STRUCT(superblock);
  87 NILFS_DEV_ATTR_STRUCT(segctor);
  88
  89 #define NILFS_CP_ATTR_STRUCT(name) \
  90 struct 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
  98 NILFS_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 */