fs/btrfs/sysfs.h

   1 #ifndef _BTRFS_SYSFS_H_
   2 #define _BTRFS_SYSFS_H_
   3
   4 enum btrfs_feature_set {
   5         FEAT_COMPAT,
   6         FEAT_COMPAT_RO,
   7         FEAT_INCOMPAT,
   8         FEAT_MAX
   9 };
  10
  11 #define __INIT_KOBJ_ATTR(_name, _mode, _show, _store)                   \
  12 {                                                                       \
  13         .attr   = { .name = __stringify(_name), .mode = _mode },        \
  14         .show   = _show,                                                \
  15         .store  = _store,                                               \
  16 }
  17
  18 #define BTRFS_ATTR_RW(_name, _mode, _show, _store)                      \
  19 static struct kobj_attribute btrfs_attr_##_name =                       \
  20                         __INIT_KOBJ_ATTR(_name, _mode, _show, _store)
  21 #define BTRFS_ATTR(_name, _mode, _show)                                 \
  22         BTRFS_ATTR_RW(_name, _mode, _show, NULL)
  23 #define BTRFS_ATTR_PTR(_name)    (&btrfs_attr_##_name.attr)
  24
  25 struct btrfs_feature_attr {
  26         struct kobj_attribute kobj_attr;
  27         enum btrfs_feature_set feature_set;
  28         u64 feature_bit;
  29 };
  30
  31 #define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit)          \
  32 static struct btrfs_feature_attr btrfs_attr_##_name = {                      \
  33         .kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO,                        \
  34                                       btrfs_feature_attr_show, NULL),        \
  35         .feature_set    = _feature_set,                                      \
  36         .feature_bit    = _prefix ##_## _feature_bit,                        \
  37 }
  38 #define BTRFS_FEAT_ATTR_PTR(_name)    (&btrfs_attr_##_name.kobj_attr.attr)
  39
  40 #define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
  41         BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
  42 #define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
  43         BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature)
  44 #define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
  45         BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
  46
  47 /* convert from attribute */
  48 #define to_btrfs_feature_attr(a) \
  49                         container_of(a, struct btrfs_feature_attr, kobj_attr)
  50 #define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
  51 #define attr_to_btrfs_feature_attr(a) \
  52                         to_btrfs_feature_attr(attr_to_btrfs_attr(a))
  53 #endif /* _BTRFS_SYSFS_H_ */