LXR linux/fs/xfs/xfs

   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
  21struct xfs_buf;
  22struct xfs_inode;
  23struct 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 */
  31static inline xfs_daddr_t
  32xfs_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 * Flags for xfs_free_eofblocks
  41 */
  42#define XFS_FREE_EOF_LOCK       (1<<0)
  43#define XFS_FREE_EOF_NOLOCK     (1<<1)
  44
  45
  46/*
  47 * helper function to extract extent size hint from inode
  48 */
  49STATIC_INLINE xfs_extlen_t
  50xfs_get_extsz_hint(
  51        xfs_inode_t     *ip)
  52{
  53        xfs_extlen_t    extsz;
  54
  55        if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
  56                extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
  57                                ? ip->i_d.di_extsize
  58                                : ip->i_mount->m_sb.sb_rextsize;
  59                ASSERT(extsz);
  60        } else {
  61                extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
  62                                ? ip->i_d.di_extsize : 0;
  63        }
  64        return extsz;
  65}
  66
  67/*
  68 * Prototypes for functions in xfs_rw.c.
  69 */
  70extern int xfs_write_clear_setuid(struct xfs_inode *ip);
  71extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
  72extern int xfs_bioerror(struct xfs_buf *bp);
  73extern int xfs_bioerror_relse(struct xfs_buf *bp);
  74extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
  75                        xfs_daddr_t blkno, int len, uint flags,
  76                        struct xfs_buf **bpp);
  77extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
  78                                xfs_buf_t *bp, xfs_daddr_t blkno);
  79
  80#endif /* __XFS_RW_H__ */
  81