fs/bcachefs/snapshot_format.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_SNAPSHOT_FORMAT_H
   3 #define _BCACHEFS_SNAPSHOT_FORMAT_H
   4
   5 struct bch_snapshot {
   6         struct bch_val          v;
   7         __le32                  flags;
   8         __le32                  parent;
   9         __le32                  children[2];
  10         __le32                  subvol;
  11         /* corresponds to a bch_snapshot_tree in BTREE_ID_snapshot_trees */
  12         __le32                  tree;
  13         __le32                  depth;
  14         __le32                  skip[3];
  15         bch_le128               btime;
  16 };
  17
  18 LE32_BITMASK(BCH_SNAPSHOT_DELETED,      struct bch_snapshot, flags,  0,  1)
  19
  20 /* True if a subvolume points to this snapshot node: */
  21 LE32_BITMASK(BCH_SNAPSHOT_SUBVOL,       struct bch_snapshot, flags,  1,  2)
  22
  23 /*
  24  * Snapshot trees:
  25  *
  26  * The snapshot_trees btree gives us persistent indentifier for each tree of
  27  * bch_snapshot nodes, and allow us to record and easily find the root/master
  28  * subvolume that other snapshots were created from:
  29  */
  30 struct bch_snapshot_tree {
  31         struct bch_val          v;
  32         __le32                  master_subvol;
  33         __le32                  root_snapshot;
  34 };
  35
  36 #endif /* _BCACHEFS_SNAPSHOT_FORMAT_H */