fs/btrfs/sysfs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef BTRFS_SYSFS_H
   4 #define BTRFS_SYSFS_H
   5
   6 /*
   7  * Data exported through sysfs
   8  */
   9 extern u64 btrfs_debugfs_test;
  10
  11 enum btrfs_feature_set {
  12         FEAT_COMPAT = 0,
  13         FEAT_COMPAT_RO,
  14         FEAT_INCOMPAT,
  15         FEAT_MAX
  16 };
  17
  18 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store)                   \
  19 {                                                                       \
  20         .attr   = { .name = __stringify(_name), .mode = _mode },        \
  21         .show   = _show,                                                \
  22         .store  = _store,                                               \
  23 }
  24
  25 #define BTRFS_ATTR_RW(_prefix, _name, _show, _store)                    \
  26         static struct kobj_attribute btrfs_attr_##_prefix##_##_name =   \
  27                         __INIT_KOBJ_ATTR(_name, 0644, _show, _store)
  28
  29 #define BTRFS_ATTR(_prefix, _name, _show)                               \
  30         static struct kobj_attribute btrfs_attr_##_prefix##_##_name =   \
  31                         __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
  32
  33 #define BTRFS_ATTR_PTR(_prefix, _name)                                  \
  34         (&btrfs_attr_##_prefix##_##_name.attr)
  35
  36
  37 struct btrfs_feature_attr {
  38         struct kobj_attribute kobj_attr;
  39         enum btrfs_feature_set feature_set;
  40         u64 feature_bit;
  41 };
  42
  43 #define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit)  \
  44 static struct btrfs_feature_attr btrfs_attr_features_##_name = {             \
  45         .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO,                        \
  46                                       btrfs_feature_attr_show,               \
  47                                       btrfs_feature_attr_store),             \
  48         .feature_set    = _feature_set,                                      \
  49         .feature_bit    = _feature_prefix ##_## _feature_bit,                \
  50 }
  51 #define BTRFS_FEAT_ATTR_PTR(_name)                                           \
  52         (&btrfs_attr_features_##_name.kobj_attr.attr)
  53
  54 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
  55         BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
  56 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
  57         BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
  58 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
  59         BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
  60
  61 /* convert from attribute */
  62 static inline struct btrfs_feature_attr *
  63 to_btrfs_feature_attr(struct kobj_attribute *a)
  64 {
  65         return container_of(a, struct btrfs_feature_attr, kobj_attr);
  66 }
  67
  68 static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
  69 {
  70         return container_of(attr, struct kobj_attribute, attr);
  71 }
  72
  73 static inline struct btrfs_feature_attr *
  74 attr_to_btrfs_feature_attr(struct attribute *attr)
  75 {
  76         return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
  77 }
  78
  79 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
  80 extern const char * const btrfs_feature_set_names[FEAT_MAX];
  81 extern struct kobj_type space_info_ktype;
  82 extern struct kobj_type btrfs_raid_ktype;
  83 int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
  84                 struct btrfs_device *one_device);
  85 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
  86                 struct btrfs_device *one_device);
  87 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
  88                                 struct kobject *parent);
  89 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
  90 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
  91 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
  92                 u64 bit, enum btrfs_feature_set set);
  93
  94 #endif