fs/xfs/xfs_rw.h

   1 /*
   2  * Copyright (c) 2000-2006 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_RW_H__
  19 #define __XFS_RW_H__
  20
  21 struct xfs_buf;
  22 struct xfs_inode;
  23 struct xfs_mount;
  24
  25 /*
  26  * Convert the given file system block to a disk block.
  27  * We have to treat it differently based on whether the
  28  * file is a real time file or not, because the bmap code
  29  * does.
  30  */
  31 static inline xfs_daddr_t
  32 xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
  33 {
  34         return (XFS_IS_REALTIME_INODE(ip) ? \
  35                  (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
  36                  XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
  37 }
  38
  39 /*
  40  * Prototypes for functions in xfs_rw.c.
  41  */
  42 extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
  43                         xfs_daddr_t blkno, int len, uint flags,
  44                         struct xfs_buf **bpp);
  45 extern xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
  46
  47 #endif /* __XFS_RW_H__ */