| /* |
| * Copyright (C) 2016 Oracle. All Rights Reserved. |
| * |
| * Author: Darrick J. Wong <darrick.wong@oracle.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
| */ |
| #ifndef __XFS_REFCOUNT_BTREE_H__ |
| #define __XFS_REFCOUNT_BTREE_H__ |
| |
| /* |
| * Reference Count Btree on-disk structures |
| */ |
| |
| struct xfs_buf; |
| struct xfs_btree_cur; |
| struct xfs_mount; |
| |
| /* |
| * Btree block header size |
| */ |
| #define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN |
| |
| /* |
| * Record, key, and pointer address macros for btree blocks. |
| * |
| * (note that some of these may appear unused, but they are used in userspace) |
| */ |
| #define XFS_REFCOUNT_REC_ADDR(block, index) \ |
| ((struct xfs_refcount_rec *) \ |
| ((char *)(block) + \ |
| XFS_REFCOUNT_BLOCK_LEN + \ |
| (((index) - 1) * sizeof(struct xfs_refcount_rec)))) |
| |
| #define XFS_REFCOUNT_KEY_ADDR(block, index) \ |
| ((struct xfs_refcount_key *) \ |
| ((char *)(block) + \ |
| XFS_REFCOUNT_BLOCK_LEN + \ |
| ((index) - 1) * sizeof(struct xfs_refcount_key))) |
| |
| #define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \ |
| ((xfs_refcount_ptr_t *) \ |
| ((char *)(block) + \ |
| XFS_REFCOUNT_BLOCK_LEN + \ |
| (maxrecs) * sizeof(struct xfs_refcount_key) + \ |
| ((index) - 1) * sizeof(xfs_refcount_ptr_t))) |
| |
| extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp, |
| struct xfs_trans *tp, struct xfs_buf *agbp, xfs_agnumber_t agno, |
| struct xfs_defer_ops *dfops); |
| extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen, |
| bool leaf); |
| extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp); |
| |
| #endif /* __XFS_REFCOUNT_BTREE_H__ */ |