fs/xfs/libxfs/xfs_refcount_btree.h

   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
  27 struct xfs_buf;
  28 struct xfs_btree_cur;
  29 struct 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
  60 extern 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);
  63 extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen,
  64                 bool leaf);
  65 extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
  66
  67 extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
  68                 unsigned long long len);
  69 extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
  70                 xfs_agblock_t agblocks);
  71
  72 extern 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__ */