xfs/libxfs/xfs_rmap_btree.h

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (c) 2014 Red Hat, Inc.
0004  * All Rights Reserved.
0005  */
0006 #ifndef __XFS_RMAP_BTREE_H__
0007 #define __XFS_RMAP_BTREE_H__
0008
0009 struct xfs_buf;
0010 struct xfs_btree_cur;
0011 struct xfs_mount;
0012 struct xbtree_afakeroot;
0013
0014 /* rmaps only exist on crc enabled filesystems */
0015 #define XFS_RMAP_BLOCK_LEN  XFS_BTREE_SBLOCK_CRC_LEN
0016
0017 /*
0018  * Record, key, and pointer address macros for btree blocks.
0019  *
0020  * (note that some of these may appear unused, but they are used in userspace)
0021  */
0022 #define XFS_RMAP_REC_ADDR(block, index) \
0023     ((struct xfs_rmap_rec *) \
0024         ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
0025          (((index) - 1) * sizeof(struct xfs_rmap_rec))))
0026
0027 #define XFS_RMAP_KEY_ADDR(block, index) \
0028     ((struct xfs_rmap_key *) \
0029         ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
0030          ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
0031
0032 #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \
0033     ((struct xfs_rmap_key *) \
0034         ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
0035          sizeof(struct xfs_rmap_key) + \
0036          ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
0037
0038 #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \
0039     ((xfs_rmap_ptr_t *) \
0040         ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
0041          (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \
0042          ((index) - 1) * sizeof(xfs_rmap_ptr_t)))
0043
0044 struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
0045                 struct xfs_trans *tp, struct xfs_buf *bp,
0046                 struct xfs_perag *pag);
0047 struct xfs_btree_cur *xfs_rmapbt_stage_cursor(struct xfs_mount *mp,
0048         struct xbtree_afakeroot *afake, struct xfs_perag *pag);
0049 void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
0050         struct xfs_trans *tp, struct xfs_buf *agbp);
0051 int xfs_rmapbt_maxrecs(int blocklen, int leaf);
0052 extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp);
0053
0054 extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp,
0055         unsigned long long len);
0056 extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp,
0057         xfs_agblock_t agblocks);
0058
0059 extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp,
0060         struct xfs_perag *pag, xfs_extlen_t *ask, xfs_extlen_t *used);
0061
0062 unsigned int xfs_rmapbt_maxlevels_ondisk(void);
0063
0064 int __init xfs_rmapbt_init_cur_cache(void);
0065 void xfs_rmapbt_destroy_cur_cache(void);
0066
0067 #endif /* __XFS_RMAP_BTREE_H__ */