| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2014 Red Hat, Inc. |
| * All Rights Reserved. |
| */ |
| #ifndef __XFS_RMAP_BTREE_H__ |
| #define __XFS_RMAP_BTREE_H__ |
| |
| struct xfs_buf; |
| struct xfs_btree_cur; |
| struct xfs_mount; |
| |
| /* rmaps only exist on crc enabled filesystems */ |
| #define XFS_RMAP_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_RMAP_REC_ADDR(block, index) \ |
| ((struct xfs_rmap_rec *) \ |
| ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ |
| (((index) - 1) * sizeof(struct xfs_rmap_rec)))) |
| |
| #define XFS_RMAP_KEY_ADDR(block, index) \ |
| ((struct xfs_rmap_key *) \ |
| ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ |
| ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) |
| |
| #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \ |
| ((struct xfs_rmap_key *) \ |
| ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ |
| sizeof(struct xfs_rmap_key) + \ |
| ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) |
| |
| #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \ |
| ((xfs_rmap_ptr_t *) \ |
| ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ |
| (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \ |
| ((index) - 1) * sizeof(xfs_rmap_ptr_t))) |
| |
| struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp, |
| struct xfs_trans *tp, struct xfs_buf *bp, |
| xfs_agnumber_t agno); |
| int xfs_rmapbt_maxrecs(int blocklen, int leaf); |
| extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp); |
| |
| extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp, |
| unsigned long long len); |
| extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp, |
| xfs_agblock_t agblocks); |
| |
| extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp, |
| xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used); |
| |
| #endif /* __XFS_RMAP_BTREE_H__ */ |