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 xbtree_afakeroot;
  17
  18/*
  19 * Btree block header size depends on a superblock flag.
  20 */
  21#define XFS_ALLOC_BLOCK_LEN(mp) \
  22        (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
  23                XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
  24
  25/*
  26 * Record, key, and pointer address macros for btree blocks.
  27 *
  28 * (note that some of these may appear unused, but they are used in userspace)
  29 */
  30#define XFS_ALLOC_REC_ADDR(mp, block, index) \
  31        ((xfs_alloc_rec_t *) \
  32                ((char *)(block) + \
  33                 XFS_ALLOC_BLOCK_LEN(mp) + \
  34                 (((index) - 1) * sizeof(xfs_alloc_rec_t))))
  35
  36#define XFS_ALLOC_KEY_ADDR(mp, block, index) \
  37        ((xfs_alloc_key_t *) \
  38                ((char *)(block) + \
  39                 XFS_ALLOC_BLOCK_LEN(mp) + \
  40                 ((index) - 1) * sizeof(xfs_alloc_key_t)))
  41
  42#define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
  43        ((xfs_alloc_ptr_t *) \
  44                ((char *)(block) + \
  45                 XFS_ALLOC_BLOCK_LEN(mp) + \
  46                 (maxrecs) * sizeof(xfs_alloc_key_t) + \
  47                 ((index) - 1) * sizeof(xfs_alloc_ptr_t)))
  48
  49extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
  50                struct xfs_trans *, struct xfs_buf *,
  51                xfs_agnumber_t, xfs_btnum_t);
  52struct xfs_btree_cur *xfs_allocbt_stage_cursor(struct xfs_mount *mp,
  53                struct xbtree_afakeroot *afake, xfs_agnumber_t agno,
  54                xfs_btnum_t btnum);
  55extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
  56extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
  57                unsigned long long len);
  58
  59void xfs_allocbt_commit_staged_btree(struct xfs_btree_cur *cur,
  60                struct xfs_trans *tp, struct xfs_buf *agbp);
  61
  62#endif  /* __XFS_ALLOC_BTREE_H__ */
  63