| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (c) 2014 Red Hat, Inc. |
| 4 | * All Rights Reserved. |
| 5 | */ |
| 6 | #ifndef __XFS_RMAP_BTREE_H__ |
| 7 | #define __XFS_RMAP_BTREE_H__ |
| 8 | |
| 9 | struct xfs_buf; |
| 10 | struct xfs_btree_cur; |
| 11 | struct xfs_mount; |
| 12 | |
| 13 | /* rmaps only exist on crc enabled filesystems */ |
| 14 | #define XFS_RMAP_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN |
| 15 | |
| 16 | /* |
| 17 | * Record, key, and pointer address macros for btree blocks. |
| 18 | * |
| 19 | * (note that some of these may appear unused, but they are used in userspace) |
| 20 | */ |
| 21 | #define XFS_RMAP_REC_ADDR(block, index) \ |
| 22 | ((struct xfs_rmap_rec *) \ |
| 23 | ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ |
| 24 | (((index) - 1) * sizeof(struct xfs_rmap_rec)))) |
| 25 | |
| 26 | #define XFS_RMAP_KEY_ADDR(block, index) \ |
| 27 | ((struct xfs_rmap_key *) \ |
| 28 | ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ |
| 29 | ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) |
| 30 | |
| 31 | #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \ |
| 32 | ((struct xfs_rmap_key *) \ |
| 33 | ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ |
| 34 | sizeof(struct xfs_rmap_key) + \ |
| 35 | ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) |
| 36 | |
| 37 | #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \ |
| 38 | ((xfs_rmap_ptr_t *) \ |
| 39 | ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ |
| 40 | (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \ |
| 41 | ((index) - 1) * sizeof(xfs_rmap_ptr_t))) |
| 42 | |
| 43 | struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp, |
| 44 | struct xfs_trans *tp, struct xfs_buf *bp, |
| 45 | xfs_agnumber_t agno); |
| 46 | int xfs_rmapbt_maxrecs(int blocklen, int leaf); |
| 47 | extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp); |
| 48 | |
| 49 | extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp, |
| 50 | unsigned long long len); |
| 51 | extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp, |
| 52 | xfs_agblock_t agblocks); |
| 53 | |
| 54 | extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp, |
| 55 | xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used); |
| 56 | |
| 57 | #endif /* __XFS_RMAP_BTREE_H__ */ |