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 struct xfbtree;
  14
  15 /* rmaps only exist on crc enabled filesystems */
  16 #define XFS_RMAP_BLOCK_LEN      XFS_BTREE_SBLOCK_CRC_LEN
  17
  18 /*
  19  * Record, key, and pointer address macros for btree blocks.
  20  *
  21  * (note that some of these may appear unused, but they are used in userspace)
  22  */
  23 #define XFS_RMAP_REC_ADDR(block, index) \
  24         ((struct xfs_rmap_rec *) \
  25                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
  26                  (((index) - 1) * sizeof(struct xfs_rmap_rec))))
  27
  28 #define XFS_RMAP_KEY_ADDR(block, index) \
  29         ((struct xfs_rmap_key *) \
  30                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
  31                  ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
  32
  33 #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \
  34         ((struct xfs_rmap_key *) \
  35                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
  36                  sizeof(struct xfs_rmap_key) + \
  37                  ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
  38
  39 #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \
  40         ((xfs_rmap_ptr_t *) \
  41                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
  42                  (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \
  43                  ((index) - 1) * sizeof(xfs_rmap_ptr_t)))
  44
  45 struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
  46                                 struct xfs_trans *tp, struct xfs_buf *bp,
  47                                 struct xfs_perag *pag);
  48 void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
  49                 struct xfs_trans *tp, struct xfs_buf *agbp);
  50 unsigned int xfs_rmapbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,
  51                 bool 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                 struct xfs_perag *pag, xfs_extlen_t *ask, xfs_extlen_t *used);
  61
  62 unsigned int xfs_rmapbt_maxlevels_ondisk(void);
  63
  64 int __init xfs_rmapbt_init_cur_cache(void);
  65 void xfs_rmapbt_destroy_cur_cache(void);
  66
  67 struct xfs_btree_cur *xfs_rmapbt_mem_cursor(struct xfs_perag *pag,
  68                 struct xfs_trans *tp, struct xfbtree *xfbtree);
  69 int xfs_rmapbt_mem_init(struct xfs_mount *mp, struct xfbtree *xfbtree,
  70                 struct xfs_buftarg *btp, xfs_agnumber_t agno);
  71
  72 #endif /* __XFS_RMAP_BTREE_H__ */