LXR linux/fs/xfs/libxfs/xfs_refcount

   1/*
   2 * Copyright (C) 2016 Oracle.  All Rights Reserved.
   3 *
   4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version 2
   9 * of the License, or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it would be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write the Free Software Foundation,
  18 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  19 */
  20#ifndef __XFS_REFCOUNT_BTREE_H__
  21#define __XFS_REFCOUNT_BTREE_H__
  22
  23/*
  24 * Reference Count Btree on-disk structures
  25 */
  26
  27struct xfs_buf;
  28struct xfs_btree_cur;
  29struct xfs_mount;
  30
  31/*
  32 * Btree block header size
  33 */
  34#define XFS_REFCOUNT_BLOCK_LEN  XFS_BTREE_SBLOCK_CRC_LEN
  35
  36/*
  37 * Record, key, and pointer address macros for btree blocks.
  38 *
  39 * (note that some of these may appear unused, but they are used in userspace)
  40 */
  41#define XFS_REFCOUNT_REC_ADDR(block, index) \
  42        ((struct xfs_refcount_rec *) \
  43                ((char *)(block) + \
  44                 XFS_REFCOUNT_BLOCK_LEN + \
  45                 (((index) - 1) * sizeof(struct xfs_refcount_rec))))
  46
  47#define XFS_REFCOUNT_KEY_ADDR(block, index) \
  48        ((struct xfs_refcount_key *) \
  49                ((char *)(block) + \
  50                 XFS_REFCOUNT_BLOCK_LEN + \
  51                 ((index) - 1) * sizeof(struct xfs_refcount_key)))
  52
  53#define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
  54        ((xfs_refcount_ptr_t *) \
  55                ((char *)(block) + \
  56                 XFS_REFCOUNT_BLOCK_LEN + \
  57                 (maxrecs) * sizeof(struct xfs_refcount_key) + \
  58                 ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
  59
  60extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
  61                struct xfs_trans *tp, struct xfs_buf *agbp, xfs_agnumber_t agno,
  62                struct xfs_defer_ops *dfops);
  63extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen,
  64                bool leaf);
  65extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
  66
  67extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
  68                unsigned long long len);
  69extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
  70                xfs_agblock_t agblocks);
  71
  72extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
  73                xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
  74
  75#endif  /* __XFS_REFCOUNT_BTREE_H__ */
  76