fs/xfs/libxfs/xfs_bmap_btree.h

   1 /*
   2  * Copyright (c) 2000,2002-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_BMAP_BTREE_H__
  19 #define __XFS_BMAP_BTREE_H__
  20
  21 struct xfs_btree_cur;
  22 struct xfs_btree_block;
  23 struct xfs_mount;
  24 struct xfs_inode;
  25 struct xfs_trans;
  26
  27 /*
  28  * Btree block header size depends on a superblock flag.
  29  */
  30 #define XFS_BMBT_BLOCK_LEN(mp) \
  31         (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
  32                 XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN)
  33
  34 #define XFS_BMBT_REC_ADDR(mp, block, index) \
  35         ((xfs_bmbt_rec_t *) \
  36                 ((char *)(block) + \
  37                  XFS_BMBT_BLOCK_LEN(mp) + \
  38                  ((index) - 1) * sizeof(xfs_bmbt_rec_t)))
  39
  40 #define XFS_BMBT_KEY_ADDR(mp, block, index) \
  41         ((xfs_bmbt_key_t *) \
  42                 ((char *)(block) + \
  43                  XFS_BMBT_BLOCK_LEN(mp) + \
  44                  ((index) - 1) * sizeof(xfs_bmbt_key_t)))
  45
  46 #define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
  47         ((xfs_bmbt_ptr_t *) \
  48                 ((char *)(block) + \
  49                  XFS_BMBT_BLOCK_LEN(mp) + \
  50                  (maxrecs) * sizeof(xfs_bmbt_key_t) + \
  51                  ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
  52
  53 #define XFS_BMDR_REC_ADDR(block, index) \
  54         ((xfs_bmdr_rec_t *) \
  55                 ((char *)(block) + \
  56                  sizeof(struct xfs_bmdr_block) + \
  57                  ((index) - 1) * sizeof(xfs_bmdr_rec_t)))
  58
  59 #define XFS_BMDR_KEY_ADDR(block, index) \
  60         ((xfs_bmdr_key_t *) \
  61                 ((char *)(block) + \
  62                  sizeof(struct xfs_bmdr_block) + \
  63                  ((index) - 1) * sizeof(xfs_bmdr_key_t)))
  64
  65 #define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
  66         ((xfs_bmdr_ptr_t *) \
  67                 ((char *)(block) + \
  68                  sizeof(struct xfs_bmdr_block) + \
  69                  (maxrecs) * sizeof(xfs_bmdr_key_t) + \
  70                  ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
  71
  72 /*
  73  * These are to be used when we know the size of the block and
  74  * we don't have a cursor.
  75  */
  76 #define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
  77         XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
  78
  79 #define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \
  80         (int)(XFS_BMBT_BLOCK_LEN(mp) + \
  81                ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
  82
  83 #define XFS_BMAP_BROOT_SPACE(mp, bb) \
  84         (XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs)))
  85 #define XFS_BMDR_SPACE_CALC(nrecs) \
  86         (int)(sizeof(xfs_bmdr_block_t) + \
  87                ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
  88 #define XFS_BMAP_BMDR_SPACE(bb) \
  89         (XFS_BMDR_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
  90
  91 /*
  92  * Maximum number of bmap btree levels.
  93  */
  94 #define XFS_BM_MAXLEVELS(mp,w)          ((mp)->m_bm_maxlevels[(w)])
  95
  96 /*
  97  * Prototypes for xfs_bmap.c to call.
  98  */
  99 extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
 100                         struct xfs_btree_block *, int);
 101
 102 void xfs_bmbt_disk_set_all(struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s);
 103 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
 104 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
 105 extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
 106
 107 extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
 108                         xfs_bmdr_block_t *, int);
 109
 110 extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
 111 extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
 112 extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
 113
 114 extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
 115                                  int whichfork, xfs_ino_t new_owner,
 116                                  struct list_head *buffer_list);
 117
 118 extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
 119                 struct xfs_trans *, struct xfs_inode *, int);
 120
 121 /*
 122  * Check that the extent does not contain an invalid unwritten extent flag.
 123  */
 124 static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork,
 125                 struct xfs_bmbt_irec *irec)
 126 {
 127         if (irec->br_state == XFS_EXT_NORM)
 128                 return true;
 129         if (whichfork == XFS_DATA_FORK &&
 130             xfs_sb_version_hasextflgbit(&mp->m_sb))
 131                 return true;
 132         return false;
 133 }
 134
 135 #endif  /* __XFS_BMAP_BTREE_H__ */