text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   * All Rights Reserved.
   */
  #ifndef __XFS_IALLOC_BTREE_H__
  #define	__XFS_IALLOC_BTREE_H__
  
  /*
   * Inode map on-disk structures
   */
  
  struct xfs_buf;
  struct xfs_btree_cur;
  struct xfs_mount;
  
  /*
   * Btree block header size depends on a superblock flag.
   */
  #define XFS_INOBT_BLOCK_LEN(mp) \
  	(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
  		XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_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_INOBT_REC_ADDR(mp, block, index) \
  	((xfs_inobt_rec_t *) \
  		((char *)(block) + \
  		 XFS_INOBT_BLOCK_LEN(mp) + \
  		 (((index) - 1) * sizeof(xfs_inobt_rec_t))))
  
  #define XFS_INOBT_KEY_ADDR(mp, block, index) \
  	((xfs_inobt_key_t *) \
  		((char *)(block) + \
  		 XFS_INOBT_BLOCK_LEN(mp) + \
  		 ((index) - 1) * sizeof(xfs_inobt_key_t)))
  
  #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
  	((xfs_inobt_ptr_t *) \
  		((char *)(block) + \
  		 XFS_INOBT_BLOCK_LEN(mp) + \
  		 (maxrecs) * sizeof(xfs_inobt_key_t) + \
  		 ((index) - 1) * sizeof(xfs_inobt_ptr_t)))
  
  extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
  		struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t,
  		xfs_btnum_t);
  struct xfs_btree_cur *xfs_inobt_stage_cursor(struct xfs_mount *mp,
  		struct xbtree_afakeroot *afake, xfs_agnumber_t agno,
  		xfs_btnum_t btnum);
  extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
  
  /* ir_holemask to inode allocation bitmap conversion */
  uint64_t xfs_inobt_irec_to_allocmask(struct xfs_inobt_rec_incore *);
  
  #if defined(DEBUG) || defined(XFS_WARN)
  int xfs_inobt_rec_check_count(struct xfs_mount *,
  			      struct xfs_inobt_rec_incore *);
  #else
  #define xfs_inobt_rec_check_count(mp, rec)	0
  #endif	/* DEBUG */
  
  int xfs_finobt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp,
  		xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
  extern xfs_extlen_t xfs_iallocbt_calc_size(struct xfs_mount *mp,
  		unsigned long long len);
  int xfs_inobt_cur(struct xfs_mount *mp, struct xfs_trans *tp,
  		xfs_agnumber_t agno, xfs_btnum_t btnum,
  		struct xfs_btree_cur **curpp, struct xfs_buf **agi_bpp);
  
  void xfs_inobt_commit_staged_btree(struct xfs_btree_cur *cur,
  		struct xfs_trans *tp, struct xfs_buf *agbp);
  
  #endif	/* __XFS_IALLOC_BTREE_H__ */
  