LXR linux/fs/xfs/libxfs/xfs_rmap

   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
   9struct xfs_buf;
  10struct xfs_btree_cur;
  11struct xfs_mount;
  12struct 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
  44struct 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);
  47struct xfs_btree_cur *xfs_rmapbt_stage_cursor(struct xfs_mount *mp,
  48                struct xbtree_afakeroot *afake, xfs_agnumber_t agno);
  49void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
  50                struct xfs_trans *tp, struct xfs_buf *agbp);
  51int xfs_rmapbt_maxrecs(int blocklen, int leaf);
  52extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp);
  53
  54extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp,
  55                unsigned long long len);
  56extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp,
  57                xfs_agblock_t agblocks);
  58
  59extern 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__ */
  63