repair/bmap.h

   1 /*
   2  * Copyright (c) 2000-2001,2005 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
  19 #ifndef _XFS_REPAIR_BMAP_H
  20 #define _XFS_REPAIR_BMAP_H
  21
  22 /*
  23  * Extent descriptor.
  24  */
  25 typedef struct bmap_ext {
  26         xfs_dfiloff_t   startoff;
  27         xfs_dfsbno_t    startblock;
  28         xfs_dfilblks_t  blockcount;
  29 } bmap_ext_t;
  30
  31 /*
  32  * Block map.
  33  */
  34 typedef struct blkmap {
  35         int             naexts;
  36         int             nexts;
  37         bmap_ext_t      exts[1];
  38 } blkmap_t;
  39
  40 #define BLKMAP_SIZE(n)  \
  41         (offsetof(blkmap_t, exts) + (sizeof(bmap_ext_t) * (n)))
  42
  43 blkmap_t        *blkmap_alloc(xfs_extnum_t nex, int whichfork);
  44 void            blkmap_free(blkmap_t *blkmap);
  45
  46 void            blkmap_set_ext(blkmap_t **blkmapp, xfs_dfiloff_t o,
  47                                xfs_dfsbno_t b, xfs_dfilblks_t c);
  48
  49 xfs_dfsbno_t    blkmap_get(blkmap_t *blkmap, xfs_dfiloff_t o);
  50 int             blkmap_getn(blkmap_t *blkmap, xfs_dfiloff_t o,
  51                             xfs_dfilblks_t nb, bmap_ext_t **bmpp,
  52                             bmap_ext_t *bmpp_single);
  53 xfs_dfiloff_t   blkmap_last_off(blkmap_t *blkmap);
  54 xfs_dfiloff_t   blkmap_next_off(blkmap_t *blkmap, xfs_dfiloff_t o, int *t);
  55
  56 #endif /* _XFS_REPAIR_BMAP_H */