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  */
   8 extern u64 btrfs_debugfs_test;
   9
  10 enum 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(_prefix, _name, _show, _store)                    \
  25         static struct kobj_attribute btrfs_attr_##_prefix##_##_name =   \
  26                         __INIT_KOBJ_ATTR(_name, 0644, _show, _store)
  27
  28 #define BTRFS_ATTR(_prefix, _name, _show)                               \
  29         static struct kobj_attribute btrfs_attr_##_prefix##_##_name =   \
  30                         __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
  31
  32 #define BTRFS_ATTR_PTR(_prefix, _name)                                  \
  33         (&btrfs_attr_##_prefix##_##_name.attr)
  34
  35
  36 struct btrfs_feature_attr {
  37         struct kobj_attribute kobj_attr;
  38         enum btrfs_feature_set feature_set;
  39         u64 feature_bit;
  40 };
  41
  42 #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit)  \
  43 static struct btrfs_feature_attr btrfs_attr_features_##_name = {             \
  44         .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO,                        \
  45                                       btrfs_feature_attr_show,               \
  46                                       btrfs_feature_attr_store),             \
  47         .feature_set    = _feature_set,                                      \
  48         .feature_bit    = _feature_prefix ##_## _feature_bit,                \
  49 }
  50 #define BTRFS_FEAT_ATTR_PTR(_name)                                           \
  51         (&btrfs_attr_features_##_name.kobj_attr.attr)
  52
  53 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
  54         BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
  55 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
  56         BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
  57 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
  58         BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
  59
  60 /* convert from attribute */
  61 static inline struct btrfs_feature_attr *
  62 to_btrfs_feature_attr(struct kobj_attribute *a)
  63 {
  64         return container_of(a, struct btrfs_feature_attr, kobj_attr);
  65 }
  66
  67 static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
  68 {
  69         return container_of(attr, struct kobj_attribute, attr);
  70 }
  71
  72 static inline struct btrfs_feature_attr *
  73 attr_to_btrfs_feature_attr(struct attribute *attr)
  74 {
  75         return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
  76 }
  77
  78 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
  79 extern const char * const btrfs_feature_set_names[3];
  80 extern struct kobj_type space_info_ktype;
  81 extern struct kobj_type btrfs_raid_ktype;
  82 int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
  83                 struct btrfs_device *one_device);
  84 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
  85                 struct btrfs_device *one_device);
  86 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
  87                                 struct kobject *parent);
  88 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
  89 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
  90 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
  91                 u64 bit, enum btrfs_feature_set set);
  92
  93 #endif /* _BTRFS_SYSFS_H_ */