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(_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
  41 struct 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)          \
  48 static 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 */
  65 static inline struct btrfs_feature_attr *
  66 to_btrfs_feature_attr(struct kobj_attribute *a)
  67 {
  68         return container_of(a, struct btrfs_feature_attr, kobj_attr);
  69 }
  70
  71 static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
  72 {
  73         return container_of(attr, struct kobj_attribute, attr);
  74 }
  75
  76 static inline struct btrfs_feature_attr *
  77 attr_to_btrfs_feature_attr(struct attribute *attr)
  78 {
  79         return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
  80 }
  81
  82 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
  83 extern const char * const btrfs_feature_set_names[3];
  84 extern struct kobj_type space_info_ktype;
  85 extern struct kobj_type btrfs_raid_ktype;
  86 int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
  87                 struct btrfs_device *one_device);
  88 int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
  89                 struct btrfs_device *one_device);
  90 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
  91                                 struct kobject *parent);
  92 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
  93 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
  94 void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
  95                 u64 bit, enum btrfs_feature_set set);
  96
  97 #endif /* _BTRFS_SYSFS_H_ */