fs/xfs/linux-2.6/xfs_lrw.h

   1 /*
   2  * Copyright (c) 2000-2003,2005 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_LRW_H__
  19 #define __XFS_LRW_H__
  20
  21 struct vnode;
  22 struct bhv_desc;
  23 struct xfs_mount;
  24 struct xfs_iocore;
  25 struct xfs_inode;
  26 struct xfs_bmbt_irec;
  27 struct xfs_buf;
  28 struct xfs_iomap;
  29
  30 #if defined(XFS_RW_TRACE)
  31 /*
  32  * Defines for the trace mechanisms in xfs_lrw.c.
  33  */
  34 #define XFS_RW_KTRACE_SIZE      128
  35
  36 #define XFS_READ_ENTER          1
  37 #define XFS_WRITE_ENTER         2
  38 #define XFS_IOMAP_READ_ENTER    3
  39 #define XFS_IOMAP_WRITE_ENTER   4
  40 #define XFS_IOMAP_READ_MAP      5
  41 #define XFS_IOMAP_WRITE_MAP     6
  42 #define XFS_IOMAP_WRITE_NOSPACE 7
  43 #define XFS_ITRUNC_START        8
  44 #define XFS_ITRUNC_FINISH1      9
  45 #define XFS_ITRUNC_FINISH2      10
  46 #define XFS_CTRUNC1             11
  47 #define XFS_CTRUNC2             12
  48 #define XFS_CTRUNC3             13
  49 #define XFS_CTRUNC4             14
  50 #define XFS_CTRUNC5             15
  51 #define XFS_CTRUNC6             16
  52 #define XFS_BUNMAPI             17
  53 #define XFS_INVAL_CACHED        18
  54 #define XFS_DIORD_ENTER         19
  55 #define XFS_DIOWR_ENTER         20
  56 #define XFS_SENDFILE_ENTER      21
  57 #define XFS_WRITEPAGE_ENTER     22
  58 #define XFS_RELEASEPAGE_ENTER   23
  59 #define XFS_INVALIDPAGE_ENTER   24
  60 #define XFS_IOMAP_ALLOC_ENTER   25
  61 #define XFS_IOMAP_ALLOC_MAP     26
  62 #define XFS_IOMAP_UNWRITTEN     27
  63 #define XFS_SPLICE_READ_ENTER   28
  64 #define XFS_SPLICE_WRITE_ENTER  29
  65 extern void xfs_rw_enter_trace(int, struct xfs_iocore *,
  66                                 void *, size_t, loff_t, int);
  67 extern void xfs_inval_cached_trace(struct xfs_iocore *,
  68                                 xfs_off_t, xfs_off_t, xfs_off_t, xfs_off_t);
  69 #else
  70 #define xfs_rw_enter_trace(tag, io, data, size, offset, ioflags)
  71 #define xfs_inval_cached_trace(io, offset, len, first, last)
  72 #endif
  73
  74 /*
  75  * Maximum count of bmaps used by read and write paths.
  76  */
  77 #define XFS_MAX_RW_NBMAPS       4
  78
  79 extern int xfs_bmap(struct bhv_desc *, xfs_off_t, ssize_t, int,
  80                         struct xfs_iomap *, int *);
  81 extern int xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
  82 extern int xfs_bdstrat_cb(struct xfs_buf *);
  83 extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
  84
  85 extern int xfs_zero_eof(struct vnode *, struct xfs_iocore *, xfs_off_t,
  86                                 xfs_fsize_t, xfs_fsize_t);
  87 extern ssize_t xfs_read(struct bhv_desc *, struct kiocb *,
  88                                 const struct iovec *, unsigned int,
  89                                 loff_t *, int, struct cred *);
  90 extern ssize_t xfs_write(struct bhv_desc *, struct kiocb *,
  91                                 const struct iovec *, unsigned int,
  92                                 loff_t *, int, struct cred *);
  93 extern ssize_t xfs_sendfile(struct bhv_desc *, struct file *,
  94                                 loff_t *, int, size_t, read_actor_t,
  95                                 void *, struct cred *);
  96 extern ssize_t xfs_splice_read(struct bhv_desc *, struct file *, loff_t *,
  97                                 struct pipe_inode_info *, size_t, int, int,
  98                                 struct cred *);
  99 extern ssize_t xfs_splice_write(struct bhv_desc *, struct pipe_inode_info *,
 100                                 struct file *, loff_t *, size_t, int, int,
 101                                 struct cred *);
 102
 103 #endif  /* __XFS_LRW_H__ */