1 /* 2 * Copyright (c) 2014 Red Hat, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #ifndef __XFS_RMAP_BTREE_H__ 19 #define __XFS_RMAP_BTREE_H__ 20 21 struct xfs_buf; 22 struct xfs_btree_cur; 23 struct xfs_mount; 24 25 /* rmaps only exist on crc enabled filesystems */ 26 #define XFS_RMAP_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN 27 28 /* 29 * Record, key, and pointer address macros for btree blocks. 30 * 31 * (note that some of these may appear unused, but they are used in userspace) 32 */ 33 #define XFS_RMAP_REC_ADDR(block, index) \ 34 ((struct xfs_rmap_rec *) \ 35 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 36 (((index) - 1) * sizeof(struct xfs_rmap_rec)))) 37 38 #define XFS_RMAP_KEY_ADDR(block, index) \ 39 ((struct xfs_rmap_key *) \ 40 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 41 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) 42 43 #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \ 44 ((struct xfs_rmap_key *) \ 45 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 46 sizeof(struct xfs_rmap_key) + \ 47 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) 48 49 #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \ 50 ((xfs_rmap_ptr_t *) \ 51 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 52 (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \ 53 ((index) - 1) * sizeof(xfs_rmap_ptr_t))) 54 55 struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp, 56 struct xfs_trans *tp, struct xfs_buf *bp, 57 xfs_agnumber_t agno); 58 int xfs_rmapbt_maxrecs(struct xfs_mount *mp, int blocklen, int leaf); 59 extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp); 60 61 extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp, 62 unsigned long long len); 63 extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp, 64 xfs_agblock_t agblocks); 65 66 extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, 67 xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used); 68 69 #endif /* __XFS_RMAP_BTREE_H__ */ 70