fs/btrfs/sysfs.h

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