LXR linux/fs/btrfs/sysfs.h

   1#ifndef _BTRFS_SYSFS_H_
   2#define _BTRFS_SYSFS_H_
   3
   4/*
   5 * Data exported through sysfs
   6 */
   7extern u64 btrfs_debugfs_test;
   8
   9enum 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
  40struct 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)          \
  47static 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 */
  64static inline struct btrfs_feature_attr *
  65to_btrfs_feature_attr(struct kobj_attribute *a)
  66{
  67        return container_of(a, struct btrfs_feature_attr, kobj_attr);
  68}
  69
  70static inline struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
  71{
  72        return container_of(attr, struct kobj_attribute, attr);
  73}
  74
  75static inline struct btrfs_feature_attr *
  76attr_to_btrfs_feature_attr(struct attribute *attr)
  77{
  78        return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
  79}
  80
  81char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
  82extern const char * const btrfs_feature_set_names[3];
  83extern struct kobj_type space_info_ktype;
  84extern struct kobj_type btrfs_raid_ktype;
  85int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
  86                struct btrfs_device *one_device);
  87int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
  88                struct btrfs_device *one_device);
  89int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
  90                                struct kobject *parent);
  91int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs);
  92void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
  93void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
  94                u64 bit, enum btrfs_feature_set set);
  95
  96#endif /* _BTRFS_SYSFS_H_ */
  97