fs/xfs/libxfs/xfs_alloc_btree.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_ALLOC_BTREE_H__
   7 #define __XFS_ALLOC_BTREE_H__
   8
   9 /*
  10  * Freespace on-disk structures
  11  */
  12
  13 struct xfs_buf;
  14 struct xfs_btree_cur;
  15 struct xfs_mount;
  16 struct xfs_perag;
  17 struct xbtree_afakeroot;
  18
  19 /*
  20  * Btree block header size depends on a superblock flag.
  21  */
  22 #define XFS_ALLOC_BLOCK_LEN(mp) \
  23         (xfs_has_crc(((mp))) ? \
  24                 XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
  25
  26 /*
  27  * Record, key, and pointer address macros for btree blocks.
  28  *
  29  * (note that some of these may appear unused, but they are used in userspace)
  30  */
  31 #define XFS_ALLOC_REC_ADDR(mp, block, index) \
  32         ((xfs_alloc_rec_t *) \
  33                 ((char *)(block) + \
  34                  XFS_ALLOC_BLOCK_LEN(mp) + \
  35                  (((index) - 1) * sizeof(xfs_alloc_rec_t))))
  36
  37 #define XFS_ALLOC_KEY_ADDR(mp, block, index) \
  38         ((xfs_alloc_key_t *) \
  39                 ((char *)(block) + \
  40                  XFS_ALLOC_BLOCK_LEN(mp) + \
  41                  ((index) - 1) * sizeof(xfs_alloc_key_t)))
  42
  43 #define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
  44         ((xfs_alloc_ptr_t *) \
  45                 ((char *)(block) + \
  46                  XFS_ALLOC_BLOCK_LEN(mp) + \
  47                  (maxrecs) * sizeof(xfs_alloc_key_t) + \
  48                  ((index) - 1) * sizeof(xfs_alloc_ptr_t)))
  49
  50 struct xfs_btree_cur *xfs_bnobt_init_cursor(struct xfs_mount *mp,
  51                 struct xfs_trans *tp, struct xfs_buf *bp,
  52                 struct xfs_perag *pag);
  53 struct xfs_btree_cur *xfs_cntbt_init_cursor(struct xfs_mount *mp,
  54                 struct xfs_trans *tp, struct xfs_buf *bp,
  55                 struct xfs_perag *pag);
  56 unsigned int xfs_allocbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,
  57                 bool leaf);
  58 extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
  59                 unsigned long long len);
  60
  61 void xfs_allocbt_commit_staged_btree(struct xfs_btree_cur *cur,
  62                 struct xfs_trans *tp, struct xfs_buf *agbp);
  63
  64 unsigned int xfs_allocbt_maxlevels_ondisk(void);
  65
  66 int __init xfs_allocbt_init_cur_cache(void);
  67 void xfs_allocbt_destroy_cur_cache(void);
  68
  69 #endif  /* __XFS_ALLOC_BTREE_H__ */