LXR linux/fs/xfs/libxfs/xfs_alloc

   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
  13struct xfs_buf;
  14struct xfs_btree_cur;
  15struct xfs_mount;
  16struct xfs_perag;
  17struct xbtree_afakeroot;
  18
  19/*
  20 * Btree block header size depends on a superblock flag.
  21 */
  22#define XFS_ALLOC_BLOCK_LEN(mp) \
  23        (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
  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
  50extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *mp,
  51                struct xfs_trans *tp, struct xfs_buf *bp,
  52                struct xfs_perag *pag, xfs_btnum_t btnum);
  53struct xfs_btree_cur *xfs_allocbt_stage_cursor(struct xfs_mount *mp,
  54                struct xbtree_afakeroot *afake, struct xfs_perag *pag,
  55                xfs_btnum_t btnum);
  56extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
  57extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
  58                unsigned long long len);
  59
  60void xfs_allocbt_commit_staged_btree(struct xfs_btree_cur *cur,
  61                struct xfs_trans *tp, struct xfs_buf *agbp);
  62
  63#endif  /* __XFS_ALLOC_BTREE_H__ */
  64