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 #define XFS_FSB_TO_DB(ip,fsb)   xfs_fsb_to_db(ip,fsb)
  32 static inline xfs_daddr_t
  33 xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
  34 {
  35         return (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
  36                  (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
  37                  XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
  38 }
  39 #define XFS_FSB_TO_DB_IO(io,fsb) xfs_fsb_to_db_io(io,fsb)
  40 static inline xfs_daddr_t
  41 xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
  42 {
  43         return (((io)->io_flags & XFS_IOCORE_RT) ? \
  44                  XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
  45                  XFS_FSB_TO_DADDR((io)->io_mount, (fsb)));
  46 }
  47
  48 /*
  49  * Flags for xfs_free_eofblocks
  50  */
  51 #define XFS_FREE_EOF_LOCK       (1<<0)
  52 #define XFS_FREE_EOF_NOLOCK     (1<<1)
  53
  54
  55 /*
  56  * helper function to extract extent size hint from inode
  57  */
  58 STATIC_INLINE xfs_extlen_t
  59 xfs_get_extsz_hint(
  60         xfs_inode_t     *ip)
  61 {
  62         xfs_extlen_t    extsz;
  63
  64         if (unlikely(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
  65                 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
  66                                 ? ip->i_d.di_extsize
  67                                 : ip->i_mount->m_sb.sb_rextsize;
  68                 ASSERT(extsz);
  69         } else {
  70                 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
  71                                 ? ip->i_d.di_extsize : 0;
  72         }
  73         return extsz;
  74 }
  75
  76 /*
  77  * Prototypes for functions in xfs_rw.c.
  78  */
  79 extern int xfs_write_clear_setuid(struct xfs_inode *ip);
  80 extern int xfs_write_sync_logforce(struct xfs_mount *mp, struct xfs_inode *ip);
  81 extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
  82 extern int xfs_bioerror(struct xfs_buf *bp);
  83 extern int xfs_bioerror_relse(struct xfs_buf *bp);
  84 extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
  85                         xfs_daddr_t blkno, int len, uint flags,
  86                         struct xfs_buf **bpp);
  87 extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
  88                                 xfs_buf_t *bp, xfs_daddr_t blkno);
  89
  90 /*
  91  * Prototypes for functions in xfs_vnodeops.c.
  92  */
  93 extern int xfs_free_eofblocks(struct xfs_mount *mp, struct xfs_inode *ip,
  94                         int flags);
  95
  96 #endif /* __XFS_RW_H__ */