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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Copyright (c) 2000,2002-2005 Silicon Graphics, Inc.4 * All Rights Reserved.5 */6#ifndef __XFS_BMAP_BTREE_H__7#define __XFS_BMAP_BTREE_H__8 9struct xfs_btree_cur;10struct xfs_btree_block;11struct xfs_mount;12struct xfs_inode;13struct xfs_trans;14struct xbtree_ifakeroot;15 16/*17 * Maximum number of bmap btree levels.18 */19#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])20 21/*22 * Prototypes for xfs_bmap.c to call.23 */24extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,25 struct xfs_btree_block *, int);26 27void xfs_bmbt_disk_set_all(struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s);28extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(const struct xfs_bmbt_rec *r);29extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(const struct xfs_bmbt_rec *r);30void xfs_bmbt_disk_get_all(const struct xfs_bmbt_rec *r,31 struct xfs_bmbt_irec *s);32 33extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,34 xfs_bmdr_block_t *, int);35 36extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);37extern int xfs_bmdr_maxrecs(int blocklen, int leaf);38unsigned int xfs_bmbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen,39 bool leaf);40 41extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,42 int whichfork, xfs_ino_t new_owner,43 struct list_head *buffer_list);44 45extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,46 struct xfs_trans *, struct xfs_inode *, int);47void xfs_bmbt_commit_staged_btree(struct xfs_btree_cur *cur,48 struct xfs_trans *tp, int whichfork);49 50extern unsigned long long xfs_bmbt_calc_size(struct xfs_mount *mp,51 unsigned long long len);52 53unsigned int xfs_bmbt_maxlevels_ondisk(void);54 55int __init xfs_bmbt_init_cur_cache(void);56void xfs_bmbt_destroy_cur_cache(void);57 58void xfs_bmbt_init_block(struct xfs_inode *ip, struct xfs_btree_block *buf,59 struct xfs_buf *bp, __u16 level, __u16 numrecs);60 61/*62 * Btree block header size depends on a superblock flag.63 */64static inline size_t65xfs_bmbt_block_len(struct xfs_mount *mp)66{67 return xfs_has_crc(mp) ?68 XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN;69}70 71/* Addresses of key, pointers, and records within an incore bmbt block. */72 73static inline struct xfs_bmbt_rec *74xfs_bmbt_rec_addr(75 struct xfs_mount *mp,76 struct xfs_btree_block *block,77 unsigned int index)78{79 return (struct xfs_bmbt_rec *)80 ((char *)block + xfs_bmbt_block_len(mp) +81 (index - 1) * sizeof(struct xfs_bmbt_rec));82}83 84static inline struct xfs_bmbt_key *85xfs_bmbt_key_addr(86 struct xfs_mount *mp,87 struct xfs_btree_block *block,88 unsigned int index)89{90 return (struct xfs_bmbt_key *)91 ((char *)block + xfs_bmbt_block_len(mp) +92 (index - 1) * sizeof(struct xfs_bmbt_key *));93}94 95static inline xfs_bmbt_ptr_t *96xfs_bmbt_ptr_addr(97 struct xfs_mount *mp,98 struct xfs_btree_block *block,99 unsigned int index,100 unsigned int maxrecs)101{102 return (xfs_bmbt_ptr_t *)103 ((char *)block + xfs_bmbt_block_len(mp) +104 maxrecs * sizeof(struct xfs_bmbt_key) +105 (index - 1) * sizeof(xfs_bmbt_ptr_t));106}107 108/* Addresses of key, pointers, and records within an ondisk bmbt block. */109 110static inline struct xfs_bmbt_rec *111xfs_bmdr_rec_addr(112 struct xfs_bmdr_block *block,113 unsigned int index)114{115 return (struct xfs_bmbt_rec *)116 ((char *)(block + 1) +117 (index - 1) * sizeof(struct xfs_bmbt_rec));118}119 120static inline struct xfs_bmbt_key *121xfs_bmdr_key_addr(122 struct xfs_bmdr_block *block,123 unsigned int index)124{125 return (struct xfs_bmbt_key *)126 ((char *)(block + 1) +127 (index - 1) * sizeof(struct xfs_bmbt_key));128}129 130static inline xfs_bmbt_ptr_t *131xfs_bmdr_ptr_addr(132 struct xfs_bmdr_block *block,133 unsigned int index,134 unsigned int maxrecs)135{136 return (xfs_bmbt_ptr_t *)137 ((char *)(block + 1) +138 maxrecs * sizeof(struct xfs_bmbt_key) +139 (index - 1) * sizeof(xfs_bmbt_ptr_t));140}141 142/*143 * Address of pointers within the incore btree root.144 *145 * These are to be used when we know the size of the block and146 * we don't have a cursor.147 */148static inline xfs_bmbt_ptr_t *149xfs_bmap_broot_ptr_addr(150 struct xfs_mount *mp,151 struct xfs_btree_block *bb,152 unsigned int i,153 unsigned int sz)154{155 return xfs_bmbt_ptr_addr(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, false));156}157 158/*159 * Compute the space required for the incore btree root containing the given160 * number of records.161 */162static inline size_t163xfs_bmap_broot_space_calc(164 struct xfs_mount *mp,165 unsigned int nrecs)166{167 return xfs_bmbt_block_len(mp) +168 (nrecs * (sizeof(struct xfs_bmbt_key) + sizeof(xfs_bmbt_ptr_t)));169}170 171/*172 * Compute the space required for the incore btree root given the ondisk173 * btree root block.174 */175static inline size_t176xfs_bmap_broot_space(177 struct xfs_mount *mp,178 struct xfs_bmdr_block *bb)179{180 return xfs_bmap_broot_space_calc(mp, be16_to_cpu(bb->bb_numrecs));181}182 183/* Compute the space required for the ondisk root block. */184static inline size_t185xfs_bmdr_space_calc(unsigned int nrecs)186{187 return sizeof(struct xfs_bmdr_block) +188 (nrecs * (sizeof(struct xfs_bmbt_key) + sizeof(xfs_bmbt_ptr_t)));189}190 191/*192 * Compute the space required for the ondisk root block given an incore root193 * block.194 */195static inline size_t196xfs_bmap_bmdr_space(struct xfs_btree_block *bb)197{198 return xfs_bmdr_space_calc(be16_to_cpu(bb->bb_numrecs));199}200 201#endif /* __XFS_BMAP_BTREE_H__ */202