fs/xfs/linux-2.6/xfs_lrw.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_LRW_H__
  33 #define __XFS_LRW_H__
  34
  35 struct vnode;
  36 struct bhv_desc;
  37 struct xfs_mount;
  38 struct xfs_iocore;
  39 struct xfs_inode;
  40 struct xfs_bmbt_irec;
  41 struct xfs_buf;
  42 struct xfs_iomap;
  43
  44 #if defined(XFS_RW_TRACE)
  45 /*
  46  * Defines for the trace mechanisms in xfs_lrw.c.
  47  */
  48 #define XFS_RW_KTRACE_SIZE      128
  49
  50 #define XFS_READ_ENTER          1
  51 #define XFS_WRITE_ENTER         2
  52 #define XFS_IOMAP_READ_ENTER    3
  53 #define XFS_IOMAP_WRITE_ENTER   4
  54 #define XFS_IOMAP_READ_MAP      5
  55 #define XFS_IOMAP_WRITE_MAP     6
  56 #define XFS_IOMAP_WRITE_NOSPACE 7
  57 #define XFS_ITRUNC_START        8
  58 #define XFS_ITRUNC_FINISH1      9
  59 #define XFS_ITRUNC_FINISH2      10
  60 #define XFS_CTRUNC1             11
  61 #define XFS_CTRUNC2             12
  62 #define XFS_CTRUNC3             13
  63 #define XFS_CTRUNC4             14
  64 #define XFS_CTRUNC5             15
  65 #define XFS_CTRUNC6             16
  66 #define XFS_BUNMAPI             17
  67 #define XFS_INVAL_CACHED        18
  68 #define XFS_DIORD_ENTER         19
  69 #define XFS_DIOWR_ENTER         20
  70 #define XFS_SENDFILE_ENTER      21
  71 #define XFS_WRITEPAGE_ENTER     22
  72 #define XFS_RELEASEPAGE_ENTER   23
  73 #define XFS_IOMAP_ALLOC_ENTER   24
  74 #define XFS_IOMAP_ALLOC_MAP     25
  75 #define XFS_IOMAP_UNWRITTEN     26
  76 extern void xfs_rw_enter_trace(int, struct xfs_iocore *,
  77                                 void *, size_t, loff_t, int);
  78 extern void xfs_inval_cached_trace(struct xfs_iocore *,
  79                                 xfs_off_t, xfs_off_t, xfs_off_t, xfs_off_t);
  80 #else
  81 #define xfs_rw_enter_trace(tag, io, data, size, offset, ioflags)
  82 #define xfs_inval_cached_trace(io, offset, len, first, last)
  83 #endif
  84
  85 /*
  86  * Maximum count of bmaps used by read and write paths.
  87  */
  88 #define XFS_MAX_RW_NBMAPS       4
  89
  90 extern int xfs_bmap(struct bhv_desc *, xfs_off_t, ssize_t, int,
  91                         struct xfs_iomap *, int *);
  92 extern int xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
  93 extern int xfs_bdstrat_cb(struct xfs_buf *);
  94
  95 extern int xfs_zero_eof(struct vnode *, struct xfs_iocore *, xfs_off_t,
  96                                 xfs_fsize_t, xfs_fsize_t);
  97 extern void xfs_inval_cached_pages(struct vnode *, struct xfs_iocore *,
  98                                 xfs_off_t, int, int);
  99 extern ssize_t xfs_read(struct bhv_desc *, struct kiocb *,
 100                                 const struct iovec *, unsigned int,
 101                                 loff_t *, int, struct cred *);
 102 extern ssize_t xfs_write(struct bhv_desc *, struct kiocb *,
 103                                 const struct iovec *, unsigned int,
 104                                 loff_t *, int, struct cred *);
 105 extern ssize_t xfs_sendfile(struct bhv_desc *, struct file *,
 106                                 loff_t *, int, size_t, read_actor_t,
 107                                 void *, struct cred *);
 108
 109 extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
 110
 111 #define XFS_FSB_TO_DB_IO(io,fsb) \
 112                 (((io)->io_flags & XFS_IOCORE_RT) ? \
 113                  XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
 114                  XFS_FSB_TO_DADDR((io)->io_mount, (fsb)))
 115
 116 #endif  /* __XFS_LRW_H__ */