fs/bcachefs/subvolume_format.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_SUBVOLUME_FORMAT_H
   3 #define _BCACHEFS_SUBVOLUME_FORMAT_H
   4
   5 #define SUBVOL_POS_MIN          POS(0, 1)
   6 #define SUBVOL_POS_MAX          POS(0, S32_MAX)
   7 #define BCACHEFS_ROOT_SUBVOL    1
   8
   9 struct bch_subvolume {
  10         struct bch_val          v;
  11         __le32                  flags;
  12         __le32                  snapshot;
  13         __le64                  inode;
  14         /*
  15          * Snapshot subvolumes form a tree, separate from the snapshot nodes
  16          * tree - if this subvolume is a snapshot, this is the ID of the
  17          * subvolume it was created from:
  18          *
  19          * This is _not_ necessarily the subvolume of the directory containing
  20          * this subvolume:
  21          */
  22         __le32                  creation_parent;
  23         __le32                  fs_path_parent;
  24         bch_le128               otime;
  25 };
  26
  27 LE32_BITMASK(BCH_SUBVOLUME_RO,          struct bch_subvolume, flags,  0,  1)
  28 /*
  29  * We need to know whether a subvolume is a snapshot so we can know whether we
  30  * can delete it (or whether it should just be rm -rf'd)
  31  */
  32 LE32_BITMASK(BCH_SUBVOLUME_SNAP,        struct bch_subvolume, flags,  1,  2)
  33 LE32_BITMASK(BCH_SUBVOLUME_UNLINKED,    struct bch_subvolume, flags,  2,  3)
  34
  35 #endif /* _BCACHEFS_SUBVOLUME_FORMAT_H */