LXR linux/fs/btrfs/sysfs.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _BTRFS_SYSFS_H_
   3#define _BTRFS_SYSFS_H_
   4
   5/*
   6 * Data exported through sysfs
   7 */
   8extern u64 btrfs_debugfs_test;
   9
  10enum btrfs_feature_set {
  11        FEAT_COMPAT,
  12        FEAT_COMPAT_RO,
  13        FEAT_INCOMPAT,
  14        FEAT_MAX
  15};
  16
  17#define __INIT_KOBJ_ATTR(_name, _mode, _show, _store)                   \
  18{                                                                       \
  19        .attr   = { .name = __stringify(_name), .mode = _mode },        \
  20        .show   = _show,                                                \
  21        .store  = _store,                                               \
  22}
  23
  24#define BTRFS_ATTR_RW(_name, _show, _store)                     \
  25        static struct kobj_attribute btrfs_attr_##_name =               \
  26                        __INIT_KOBJ_ATTR(_name, 0644, _show, _store)
  27
  28#define BTRFS_ATTR(_name, _show)                                        \
  29        static struct kobj_attribute btrfs_attr_##_name =               \
  30                        __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
  31
  32#define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)
  33
  34#define BTRFS_RAID_ATTR(_name, _show)                                   \
  35        static struct kobj_attribute btrfs_raid_attr_##_name =          \
  36                        __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
  37
  38#define BTRFS_RAID_ATTR_PTR(_name)    (&btrfs_raid_attr_##_name.attr)
  39
  40
  41struct btrfs_feature_attr {
  42        struct kobj_attribute kobj_attr;
  43        enum btrfs_feature_set feature_set;
  44        u64 feature_bit;
  45};
  46
  47#define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit)          \
  48static struct btrfs_feature_attr btrfs_attr_##_name = {                      \
  49        .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO,                        \
  50                                      btrfs_feature_attr_show,               \
  51                                      btrfs_feature_attr_store),             \
  52        .feature_set    = _feature_set,                                      \
  53        .feature_bit    = _prefix ##_## _feature_bit,                        \
  54}
  55#define BTRFS_FEAT_ATTR_PTR(_name)    (&btrfs_attr_##_name.kobj_attr.attr)
  56
  57#define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
  58        BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
  59#define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
  60        BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
  61#define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
  62        BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
  63
  64/* convert from attribute */
  65static inline struct btrfs_feature_attr *
  66to_btrfs_feature_attr(struct kobj_attribute *a)
  67{
  68        return container_of(a, struct btrfs_feature_attr, kobj_attr);
  69}
  70
  71static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
  72{
  73        return container_of(attr, struct kobj_attribute, attr);
  74}
  75
  76static inline struct btrfs_feature_attr *
  77attr_to_btrfs_feature_attr(struct attribute *attr)
  78{
  79        return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
  80}
  81
  82char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
  83extern const char * const btrfs_feature_set_names[3];
  84extern struct kobj_type space_info_ktype;
  85extern struct kobj_type btrfs_raid_ktype;
  86int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
  87                struct btrfs_device *one_device);
  88int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
  89                struct btrfs_device *one_device);
  90int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
  91                                struct kobject *parent);
  92int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
  93void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
  94void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
  95                u64 bit, enum btrfs_feature_set set);
  96
  97#endif /* _BTRFS_SYSFS_H_ */
  98