fs/bcachefs/subvolume_types.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_SUBVOLUME_TYPES_H
   3 #define _BCACHEFS_SUBVOLUME_TYPES_H
   4
   5 #include "darray.h"
   6
   7 typedef DARRAY(u32) snapshot_id_list;
   8
   9 #define IS_ANCESTOR_BITMAP      128
  10
  11 struct snapshot_t {
  12         bool                    live;
  13         u32                     parent;
  14         u32                     skip[3];
  15         u32                     depth;
  16         u32                     children[2];
  17         u32                     subvol; /* Nonzero only if a subvolume points to this node: */
  18         u32                     tree;
  19         unsigned long           is_ancestor[BITS_TO_LONGS(IS_ANCESTOR_BITMAP)];
  20 };
  21
  22 struct snapshot_table {
  23         struct rcu_head         rcu;
  24         size_t                  nr;
  25 #ifndef RUST_BINDGEN
  26         DECLARE_FLEX_ARRAY(struct snapshot_t, s);
  27 #else
  28         struct snapshot_t       s[0];
  29 #endif
  30 };
  31
  32 typedef struct {
  33         /* we can't have padding in this struct: */
  34         u64             subvol;
  35         u64             inum;
  36 } subvol_inum;
  37
  38 #endif /* _BCACHEFS_SUBVOLUME_TYPES_H */