fs/xfs/xfs_rw.h

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_RW_H__
  33 #define __XFS_RW_H__
  34
  35 struct xfs_buf;
  36 struct xfs_inode;
  37 struct xfs_mount;
  38
  39 /*
  40  * Maximum count of bmaps used by read and write paths.
  41  */
  42 #define XFS_MAX_RW_NBMAPS       4
  43
  44 /*
  45  * Counts of readahead buffers to use based on physical memory size.
  46  * None of these should be more than XFS_MAX_RW_NBMAPS.
  47  */
  48 #define XFS_RW_NREADAHEAD_16MB  2
  49 #define XFS_RW_NREADAHEAD_32MB  3
  50 #define XFS_RW_NREADAHEAD_K32   4
  51 #define XFS_RW_NREADAHEAD_K64   4
  52
  53 /*
  54  * Maximum size of a buffer that we\'ll map.  Making this
  55  * too big will degrade performance due to the number of
  56  * pages which need to be gathered.  Making it too small
  57  * will prevent us from doing large I/O\'s to hardware that
  58  * needs it.
  59  *
  60  * This is currently set to 512 KB.
  61  */
  62 #define XFS_MAX_BMAP_LEN_BB     1024
  63 #define XFS_MAX_BMAP_LEN_BYTES  524288
  64
  65 /*
  66  * Convert the given file system block to a disk block.
  67  * We have to treat it differently based on whether the
  68  * file is a real time file or not, because the bmap code
  69  * does.
  70  */
  71 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_DB)
  72 xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
  73 #define XFS_FSB_TO_DB(ip,fsb)   xfs_fsb_to_db(ip,fsb)
  74 #else
  75 #define XFS_FSB_TO_DB(ip,fsb) \
  76                 (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
  77                  (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
  78                  XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)))
  79 #endif
  80
  81 #define XFS_FSB_TO_DB_IO(io,fsb) \
  82                 (((io)->io_flags & XFS_IOCORE_RT) ? \
  83                  XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
  84                  XFS_FSB_TO_DADDR((io)->io_mount, (fsb)))
  85
  86 /*
  87  * Prototypes for functions in xfs_rw.c.
  88  */
  89
  90 int
  91 xfs_write_clear_setuid(
  92         struct xfs_inode        *ip);
  93
  94 int
  95 xfs_bwrite(
  96         struct xfs_mount        *mp,
  97         struct xfs_buf          *bp);
  98
  99 int
 100 xfs_bioerror(
 101         struct xfs_buf          *b);
 102
 103 int
 104 xfs_bioerror_relse(
 105         struct xfs_buf          *b);
 106
 107 int
 108 xfs_read_buf(
 109         struct xfs_mount        *mp,
 110         xfs_buftarg_t           *target,
 111         xfs_daddr_t             blkno,
 112         int                     len,
 113         uint                    flags,
 114         struct xfs_buf          **bpp);
 115
 116 void
 117 xfs_ioerror_alert(
 118         char                    *func,
 119         struct xfs_mount        *mp,
 120         xfs_buf_t               *bp,
 121         xfs_daddr_t             blkno);
 122
 123
 124 /*
 125  * Prototypes for functions in xfs_vnodeops.c.
 126  */
 127
 128 int
 129 xfs_rwlock(
 130         bhv_desc_t              *bdp,
 131         vrwlock_t               write_lock);
 132
 133 void
 134 xfs_rwunlock(
 135         bhv_desc_t              *bdp,
 136         vrwlock_t               write_lock);
 137
 138 int
 139 xfs_change_file_space(
 140         bhv_desc_t              *bdp,
 141         int                     cmd,
 142         xfs_flock64_t           *bf,
 143         xfs_off_t               offset,
 144         cred_t                  *credp,
 145         int                     flags);
 146
 147 int
 148 xfs_set_dmattrs(
 149         bhv_desc_t              *bdp,
 150         u_int                   evmask,
 151         u_int16_t               state,
 152         cred_t                  *credp);
 153
 154 #endif /* __XFS_RW_H__ */