fs/xfs/libxfs/xfs_rmap_btree.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2014 Red Hat, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_RMAP_BTREE_H__
   7 #define __XFS_RMAP_BTREE_H__
   8
   9 struct xfs_buf;
  10 struct xfs_btree_cur;
  11 struct xfs_mount;
  12 struct xbtree_afakeroot;
  13
  14 /* rmaps only exist on crc enabled filesystems */
  15 #define XFS_RMAP_BLOCK_LEN      XFS_BTREE_SBLOCK_CRC_LEN
  16
  17 /*
  18  * Record, key, and pointer address macros for btree blocks.
  19  *
  20  * (note that some of these may appear unused, but they are used in userspace)
  21  */
  22 #define XFS_RMAP_REC_ADDR(block, index) \
  23         ((struct xfs_rmap_rec *) \
  24                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
  25                  (((index) - 1) * sizeof(struct xfs_rmap_rec))))
  26
  27 #define XFS_RMAP_KEY_ADDR(block, index) \
  28         ((struct xfs_rmap_key *) \
  29                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
  30                  ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
  31
  32 #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \
  33         ((struct xfs_rmap_key *) \
  34                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
  35                  sizeof(struct xfs_rmap_key) + \
  36                  ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
  37
  38 #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \
  39         ((xfs_rmap_ptr_t *) \
  40                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
  41                  (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \
  42                  ((index) - 1) * sizeof(xfs_rmap_ptr_t)))
  43
  44 struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
  45                                 struct xfs_trans *tp, struct xfs_buf *bp,
  46                                 xfs_agnumber_t agno);
  47 struct xfs_btree_cur *xfs_rmapbt_stage_cursor(struct xfs_mount *mp,
  48                 struct xbtree_afakeroot *afake, xfs_agnumber_t agno);
  49 void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
  50                 struct xfs_trans *tp, struct xfs_buf *agbp);
  51 int xfs_rmapbt_maxrecs(int blocklen, int leaf);
  52 extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp);
  53
  54 extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp,
  55                 unsigned long long len);
  56 extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp,
  57                 xfs_agblock_t agblocks);
  58
  59 extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp,
  60                 xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
  61
  62 #endif  /* __XFS_RMAP_BTREE_H__ */