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  * helper function to extract extent size hint from inode
  41  */
  42 STATIC_INLINE xfs_extlen_t
  43 xfs_get_extsz_hint(
  44         xfs_inode_t     *ip)
  45 {
  46         xfs_extlen_t    extsz;
  47
  48         if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
  49                 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
  50                                 ? ip->i_d.di_extsize
  51                                 : ip->i_mount->m_sb.sb_rextsize;
  52                 ASSERT(extsz);
  53         } else {
  54                 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
  55                                 ? ip->i_d.di_extsize : 0;
  56         }
  57         return extsz;
  58 }
  59
  60 /*
  61  * Prototypes for functions in xfs_rw.c.
  62  */
  63 extern int xfs_write_clear_setuid(struct xfs_inode *ip);
  64 extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
  65 extern int xfs_bioerror(struct xfs_buf *bp);
  66 extern int xfs_bioerror_relse(struct xfs_buf *bp);
  67 extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
  68                         xfs_daddr_t blkno, int len, uint flags,
  69                         struct xfs_buf **bpp);
  70 extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
  71                                 xfs_buf_t *bp, xfs_daddr_t blkno);
  72
  73 #endif /* __XFS_RW_H__ */