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 71 extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp, 72 xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used); 73 74 #endif /* __XFS_REFCOUNT_BTREE_H__ */ 75