| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (c) 2000,2005 Silicon Graphics, Inc. |
| 4 | * All Rights Reserved. |
| 5 | */ |
| 6 | #ifndef __XFS_ALLOC_BTREE_H__ |
| 7 | #define __XFS_ALLOC_BTREE_H__ |
| 8 | |
| 9 | /* |
| 10 | * Freespace on-disk structures |
| 11 | */ |
| 12 | |
| 13 | struct xfs_buf; |
| 14 | struct xfs_btree_cur; |
| 15 | struct xfs_mount; |
| 16 | |
| 17 | /* |
| 18 | * Btree block header size depends on a superblock flag. |
| 19 | */ |
| 20 | #define XFS_ALLOC_BLOCK_LEN(mp) \ |
| 21 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ |
| 22 | XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN) |
| 23 | |
| 24 | /* |
| 25 | * Record, key, and pointer address macros for btree blocks. |
| 26 | * |
| 27 | * (note that some of these may appear unused, but they are used in userspace) |
| 28 | */ |
| 29 | #define XFS_ALLOC_REC_ADDR(mp, block, index) \ |
| 30 | ((xfs_alloc_rec_t *) \ |
| 31 | ((char *)(block) + \ |
| 32 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
| 33 | (((index) - 1) * sizeof(xfs_alloc_rec_t)))) |
| 34 | |
| 35 | #define XFS_ALLOC_KEY_ADDR(mp, block, index) \ |
| 36 | ((xfs_alloc_key_t *) \ |
| 37 | ((char *)(block) + \ |
| 38 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
| 39 | ((index) - 1) * sizeof(xfs_alloc_key_t))) |
| 40 | |
| 41 | #define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \ |
| 42 | ((xfs_alloc_ptr_t *) \ |
| 43 | ((char *)(block) + \ |
| 44 | XFS_ALLOC_BLOCK_LEN(mp) + \ |
| 45 | (maxrecs) * sizeof(xfs_alloc_key_t) + \ |
| 46 | ((index) - 1) * sizeof(xfs_alloc_ptr_t))) |
| 47 | |
| 48 | extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *, |
| 49 | struct xfs_trans *, struct xfs_buf *, |
| 50 | xfs_agnumber_t, xfs_btnum_t); |
| 51 | extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int); |
| 52 | extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp, |
| 53 | unsigned long long len); |
| 54 | |
| 55 | #endif /* __XFS_ALLOC_BTREE_H__ */ |