fs/ocfs2/extent_map.h

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * extent_map.h
   5  *
   6  * In-memory file extent mappings for OCFS2.
   7  *
   8  * Copyright (C) 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License, version 2,  as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public
  20  * License along with this program; if not, write to the
  21  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22  * Boston, MA 021110-1307, USA.
  23  */
  24
  25 #ifndef _EXTENT_MAP_H
  26 #define _EXTENT_MAP_H
  27
  28 int init_ocfs2_extent_maps(void);
  29 void exit_ocfs2_extent_maps(void);
  30
  31 /*
  32  * EVERY CALL here except _init, _trunc, and _drop expects alloc_sem
  33  * to be held.  The allocation cannot change at all while the map is
  34  * in the process of being updated.
  35  */
  36 int ocfs2_extent_map_init(struct inode *inode);
  37 int ocfs2_extent_map_append(struct inode *inode,
  38                             struct ocfs2_extent_rec *rec,
  39                             u32 new_clusters);
  40 int ocfs2_extent_map_get_blocks(struct inode *inode,
  41                                 u64 v_blkno, int count,
  42                                 u64 *p_blkno, int *ret_count);
  43 int ocfs2_extent_map_drop(struct inode *inode, u32 new_clusters);
  44 int ocfs2_extent_map_trunc(struct inode *inode, u32 new_clusters);
  45
  46 #endif  /* _EXTENT_MAP_H */