fs/nilfs2/sysfs.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * sysfs.h - sysfs support declarations.
   4  *
   5  * Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation.
   6  * Copyright (C) 2014 HGST, Inc., a Western Digital Company.
   7  *
   8  * Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
   9  */
  10
  11 #ifndef _NILFS_SYSFS_H
  12 #define _NILFS_SYSFS_H
  13
  14 #include <linux/sysfs.h>
  15
  16 #define NILFS_ROOT_GROUP_NAME   "nilfs2"
  17
  18 /*
  19  * struct nilfs_sysfs_dev_subgroups - device subgroup kernel objects
  20  * @sg_superblock_kobj: /sys/fs/<nilfs>/<device>/superblock
  21  * @sg_superblock_kobj_unregister: completion state
  22  * @sg_segctor_kobj: /sys/fs/<nilfs>/<device>/segctor
  23  * @sg_segctor_kobj_unregister: completion state
  24  * @sg_mounted_snapshots_kobj: /sys/fs/<nilfs>/<device>/mounted_snapshots
  25  * @sg_mounted_snapshots_kobj_unregister: completion state
  26  * @sg_checkpoints_kobj: /sys/fs/<nilfs>/<device>/checkpoints
  27  * @sg_checkpoints_kobj_unregister: completion state
  28  * @sg_segments_kobj: /sys/fs/<nilfs>/<device>/segments
  29  * @sg_segments_kobj_unregister: completion state
  30  */
  31 struct nilfs_sysfs_dev_subgroups {
  32         /* /sys/fs/<nilfs>/<device>/superblock */
  33         struct kobject sg_superblock_kobj;
  34         struct completion sg_superblock_kobj_unregister;
  35
  36         /* /sys/fs/<nilfs>/<device>/segctor */
  37         struct kobject sg_segctor_kobj;
  38         struct completion sg_segctor_kobj_unregister;
  39
  40         /* /sys/fs/<nilfs>/<device>/mounted_snapshots */
  41         struct kobject sg_mounted_snapshots_kobj;
  42         struct completion sg_mounted_snapshots_kobj_unregister;
  43
  44         /* /sys/fs/<nilfs>/<device>/checkpoints */
  45         struct kobject sg_checkpoints_kobj;
  46         struct completion sg_checkpoints_kobj_unregister;
  47
  48         /* /sys/fs/<nilfs>/<device>/segments */
  49         struct kobject sg_segments_kobj;
  50         struct completion sg_segments_kobj_unregister;
  51 };
  52
  53 #define NILFS_COMMON_ATTR_STRUCT(name) \
  54 struct nilfs_##name##_attr { \
  55         struct attribute attr; \
  56         ssize_t (*show)(struct kobject *, struct attribute *, \
  57                         char *); \
  58         ssize_t (*store)(struct kobject *, struct attribute *, \
  59                          const char *, size_t); \
  60 }
  61
  62 NILFS_COMMON_ATTR_STRUCT(feature);
  63
  64 #define NILFS_DEV_ATTR_STRUCT(name) \
  65 struct nilfs_##name##_attr { \
  66         struct attribute attr; \
  67         ssize_t (*show)(struct nilfs_##name##_attr *, struct the_nilfs *, \
  68                         char *); \
  69         ssize_t (*store)(struct nilfs_##name##_attr *, struct the_nilfs *, \
  70                          const char *, size_t); \
  71 }
  72
  73 NILFS_DEV_ATTR_STRUCT(dev);
  74 NILFS_DEV_ATTR_STRUCT(segments);
  75 NILFS_DEV_ATTR_STRUCT(mounted_snapshots);
  76 NILFS_DEV_ATTR_STRUCT(checkpoints);
  77 NILFS_DEV_ATTR_STRUCT(superblock);
  78 NILFS_DEV_ATTR_STRUCT(segctor);
  79
  80 #define NILFS_CP_ATTR_STRUCT(name) \
  81 struct nilfs_##name##_attr { \
  82         struct attribute attr; \
  83         ssize_t (*show)(struct nilfs_##name##_attr *, struct nilfs_root *, \
  84                         char *); \
  85         ssize_t (*store)(struct nilfs_##name##_attr *, struct nilfs_root *, \
  86                          const char *, size_t); \
  87 }
  88
  89 NILFS_CP_ATTR_STRUCT(snapshot);
  90
  91 #define NILFS_ATTR(type, name, mode, show, store) \
  92         static struct nilfs_##type##_attr nilfs_##type##_attr_##name = \
  93                 __ATTR(name, mode, show, store)
  94
  95 #define NILFS_INFO_ATTR(type, name) \
  96         NILFS_ATTR(type, name, 0444, NULL, NULL)
  97 #define NILFS_RO_ATTR(type, name) \
  98         NILFS_ATTR(type, name, 0444, nilfs_##type##_##name##_show, NULL)
  99 #define NILFS_RW_ATTR(type, name) \
 100         NILFS_ATTR(type, name, 0644, \
 101                     nilfs_##type##_##name##_show, \
 102                     nilfs_##type##_##name##_store)
 103
 104 #define NILFS_FEATURE_INFO_ATTR(name) \
 105         NILFS_INFO_ATTR(feature, name)
 106 #define NILFS_FEATURE_RO_ATTR(name) \
 107         NILFS_RO_ATTR(feature, name)
 108 #define NILFS_FEATURE_RW_ATTR(name) \
 109         NILFS_RW_ATTR(feature, name)
 110
 111 #define NILFS_DEV_INFO_ATTR(name) \
 112         NILFS_INFO_ATTR(dev, name)
 113 #define NILFS_DEV_RO_ATTR(name) \
 114         NILFS_RO_ATTR(dev, name)
 115 #define NILFS_DEV_RW_ATTR(name) \
 116         NILFS_RW_ATTR(dev, name)
 117
 118 #define NILFS_SEGMENTS_RO_ATTR(name) \
 119         NILFS_RO_ATTR(segments, name)
 120 #define NILFS_SEGMENTS_RW_ATTR(name) \
 121         NILFS_RW_ATTR(segs_info, name)
 122
 123 #define NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(name) \
 124         NILFS_RO_ATTR(mounted_snapshots, name)
 125
 126 #define NILFS_CHECKPOINTS_RO_ATTR(name) \
 127         NILFS_RO_ATTR(checkpoints, name)
 128 #define NILFS_CHECKPOINTS_RW_ATTR(name) \
 129         NILFS_RW_ATTR(checkpoints, name)
 130
 131 #define NILFS_SNAPSHOT_INFO_ATTR(name) \
 132         NILFS_INFO_ATTR(snapshot, name)
 133 #define NILFS_SNAPSHOT_RO_ATTR(name) \
 134         NILFS_RO_ATTR(snapshot, name)
 135 #define NILFS_SNAPSHOT_RW_ATTR(name) \
 136         NILFS_RW_ATTR(snapshot, name)
 137
 138 #define NILFS_SUPERBLOCK_RO_ATTR(name) \
 139         NILFS_RO_ATTR(superblock, name)
 140 #define NILFS_SUPERBLOCK_RW_ATTR(name) \
 141         NILFS_RW_ATTR(superblock, name)
 142
 143 #define NILFS_SEGCTOR_INFO_ATTR(name) \
 144         NILFS_INFO_ATTR(segctor, name)
 145 #define NILFS_SEGCTOR_RO_ATTR(name) \
 146         NILFS_RO_ATTR(segctor, name)
 147 #define NILFS_SEGCTOR_RW_ATTR(name) \
 148         NILFS_RW_ATTR(segctor, name)
 149
 150 #define NILFS_FEATURE_ATTR_LIST(name) \
 151         (&nilfs_feature_attr_##name.attr)
 152 #define NILFS_DEV_ATTR_LIST(name) \
 153         (&nilfs_dev_attr_##name.attr)
 154 #define NILFS_SEGMENTS_ATTR_LIST(name) \
 155         (&nilfs_segments_attr_##name.attr)
 156 #define NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(name) \
 157         (&nilfs_mounted_snapshots_attr_##name.attr)
 158 #define NILFS_CHECKPOINTS_ATTR_LIST(name) \
 159         (&nilfs_checkpoints_attr_##name.attr)
 160 #define NILFS_SNAPSHOT_ATTR_LIST(name) \
 161         (&nilfs_snapshot_attr_##name.attr)
 162 #define NILFS_SUPERBLOCK_ATTR_LIST(name) \
 163         (&nilfs_superblock_attr_##name.attr)
 164 #define NILFS_SEGCTOR_ATTR_LIST(name) \
 165         (&nilfs_segctor_attr_##name.attr)
 166
 167 #endif /* _NILFS_SYSFS_H */