fs/bcachefs/reflink_format.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_REFLINK_FORMAT_H
   3 #define _BCACHEFS_REFLINK_FORMAT_H
   4
   5 struct bch_reflink_p {
   6         struct bch_val          v;
   7         __le64                  idx;
   8         /*
   9          * A reflink pointer might point to an indirect extent which is then
  10          * later split (by copygc or rebalance). If we only pointed to part of
  11          * the original indirect extent, and then one of the fragments is
  12          * outside the range we point to, we'd leak a refcount: so when creating
  13          * reflink pointers, we need to store pad values to remember the full
  14          * range we were taking a reference on.
  15          */
  16         __le32                  front_pad;
  17         __le32                  back_pad;
  18 } __packed __aligned(8);
  19
  20 struct bch_reflink_v {
  21         struct bch_val          v;
  22         __le64                  refcount;
  23         union bch_extent_entry  start[0];
  24         __u64                   _data[];
  25 } __packed __aligned(8);
  26
  27 struct bch_indirect_inline_data {
  28         struct bch_val          v;
  29         __le64                  refcount;
  30         u8                      data[];
  31 };
  32
  33 #endif /* _BCACHEFS_REFLINK_FORMAT_H */