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, _mode, _show, _store)                      \
  24 static struct kobj_attribute btrfs_attr_##_name =                       \
  25                         __INIT_KOBJ_ATTR(_name, _mode, _show, _store)
  26 #define BTRFS_ATTR(_name, _mode, _show)                                 \
  27         BTRFS_ATTR_RW(_name, _mode, _show, NULL)
  28 #define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)
  29
  30 #define BTRFS_RAID_ATTR(_name, _show)                                   \
  31 static struct kobj_attribute btrfs_raid_attr_##_name =                  \
  32                         __INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
  33 #define BTRFS_RAID_ATTR_PTR(_name)    (&btrfs_raid_attr_##_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, _prefix, _feature_bit)          \
  43 static struct btrfs_feature_attr btrfs_attr_##_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    = _prefix ##_## _feature_bit,                        \
  49 }
  50 #define BTRFS_FEAT_ATTR_PTR(_name)    (&btrfs_attr_##_name.kobj_attr.attr)
  51
  52 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
  53         BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
  54 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
  55         BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature)
  56 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
  57         BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
  58
  59 /* convert from attribute */
  60 #define to_btrfs_feature_attr(a) \
  61                         container_of(a, struct btrfs_feature_attr, kobj_attr)
  62 #define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
  63 #define attr_to_btrfs_feature_attr(a) \
  64                         to_btrfs_feature_attr(attr_to_btrfs_attr(a))
  65 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
  66 extern const char * const btrfs_feature_set_names[3];
  67 extern struct kobj_type space_info_ktype;
  68 extern struct kobj_type btrfs_raid_ktype;
  69 int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
  70                 struct btrfs_device *one_device);
  71 int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
  72                 struct btrfs_device *one_device);
  73 #endif /* _BTRFS_SYSFS_H_ */