root/fs/xfs/libxfs/xfs_ialloc_btree.h

INCLUDED FROM

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_IALLOC_BTREE_H__
   7 #define __XFS_IALLOC_BTREE_H__
   8 
   9 /*
  10  * Inode map 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_INOBT_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_INOBT_REC_ADDR(mp, block, index) \
  30         ((xfs_inobt_rec_t *) \
  31                 ((char *)(block) + \
  32                  XFS_INOBT_BLOCK_LEN(mp) + \
  33                  (((index) - 1) * sizeof(xfs_inobt_rec_t))))
  34 
  35 #define XFS_INOBT_KEY_ADDR(mp, block, index) \
  36         ((xfs_inobt_key_t *) \
  37                 ((char *)(block) + \
  38                  XFS_INOBT_BLOCK_LEN(mp) + \
  39                  ((index) - 1) * sizeof(xfs_inobt_key_t)))
  40 
  41 #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
  42         ((xfs_inobt_ptr_t *) \
  43                 ((char *)(block) + \
  44                  XFS_INOBT_BLOCK_LEN(mp) + \
  45                  (maxrecs) * sizeof(xfs_inobt_key_t) + \
  46                  ((index) - 1) * sizeof(xfs_inobt_ptr_t)))
  47 
  48 extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
  49                 struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t,
  50                 xfs_btnum_t);
  51 extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
  52 
  53 /* ir_holemask to inode allocation bitmap conversion */
  54 uint64_t xfs_inobt_irec_to_allocmask(struct xfs_inobt_rec_incore *);
  55 
  56 #if defined(DEBUG) || defined(XFS_WARN)
  57 int xfs_inobt_rec_check_count(struct xfs_mount *,
  58                               struct xfs_inobt_rec_incore *);
  59 #else
  60 #define xfs_inobt_rec_check_count(mp, rec)      0
  61 #endif  /* DEBUG */
  62 
  63 int xfs_finobt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp,
  64                 xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
  65 extern xfs_extlen_t xfs_iallocbt_calc_size(struct xfs_mount *mp,
  66                 unsigned long long len);
  67 int xfs_inobt_cur(struct xfs_mount *mp, struct xfs_trans *tp,
  68                 xfs_agnumber_t agno, xfs_btnum_t btnum,
  69                 struct xfs_btree_cur **curpp, struct xfs_buf **agi_bpp);
  70 
  71 #endif  /* __XFS_IALLOC_BTREE_H__ */