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diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
new file mode 100644
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+++ b/fs/xfs/xfs_iomap.h
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+/*
+ * Copyright (c) 2003,2004 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+
+
+#ifndef __XFS_IOMAP_H__
+#define __XFS_IOMAP_H__
+
+#define IOMAP_DADDR_NULL ((xfs_daddr_t) (-1LL))
+
+
+typedef enum {                          /* iomap_flags values */
+        IOMAP_EOF =             0x01,   /* mapping contains EOF   */
+        IOMAP_HOLE =            0x02,   /* mapping covers a hole  */
+        IOMAP_DELAY =           0x04,   /* mapping covers delalloc region  */
+        IOMAP_REALTIME =        0x10,   /* mapping on the realtime device  */
+        IOMAP_UNWRITTEN =       0x20,   /* mapping covers allocated */
+                                        /* but uninitialized file data  */
+        IOMAP_NEW =             0x40    /* just allocate */
+} iomap_flags_t;
+
+typedef enum {
+        /* base extent manipulation calls */
+        BMAPI_READ = (1 << 0),          /* read extents */
+        BMAPI_WRITE = (1 << 1),         /* create extents */
+        BMAPI_ALLOCATE = (1 << 2),      /* delayed allocate to real extents */
+        BMAPI_UNWRITTEN  = (1 << 3),    /* unwritten extents to real extents */
+        /* modifiers */
+        BMAPI_IGNSTATE = (1 << 4),      /* ignore unwritten state on read */
+        BMAPI_DIRECT = (1 << 5),                /* direct instead of buffered write */
+        BMAPI_MMAP = (1 << 6),          /* allocate for mmap write */
+        BMAPI_SYNC = (1 << 7),          /* sync write to flush delalloc space */
+        BMAPI_TRYLOCK = (1 << 8),       /* non-blocking request */
+        BMAPI_DEVICE = (1 << 9),        /* we only want to know the device */
+} bmapi_flags_t;
+
+
+/*
+ * xfs_iomap_t:  File system I/O map
+ *
+ * The iomap_bn field is expressed in 512-byte blocks, and is where the 
+ * mapping starts on disk.
+ *
+ * The iomap_offset, iomap_bsize and iomap_delta fields are in bytes.
+ * iomap_offset is the offset of the mapping in the file itself.
+ * iomap_bsize is the size of the mapping,  iomap_delta is the 
+ * desired data's offset into the mapping, given the offset supplied 
+ * to the file I/O map routine.
+ *
+ * When a request is made to read beyond the logical end of the object,
+ * iomap_size may be set to 0, but iomap_offset and iomap_length should be set
+ * to the actual amount of underlying storage that has been allocated, if any.
+ */
+
+typedef struct xfs_iomap {
+        xfs_daddr_t             iomap_bn;       /* first 512b blk of mapping */
+        xfs_buftarg_t           *iomap_target;
+        loff_t                  iomap_offset;   /* offset of mapping, bytes */
+        loff_t                  iomap_bsize;    /* size of mapping, bytes */
+        size_t                  iomap_delta;    /* offset into mapping, bytes */
+        iomap_flags_t           iomap_flags;
+} xfs_iomap_t;
+
+struct xfs_iocore;
+struct xfs_inode;
+struct xfs_bmbt_irec;
+
+extern int xfs_iomap(struct xfs_iocore *, xfs_off_t, ssize_t, int,
+                     struct xfs_iomap *, int *);
+extern int xfs_iomap_write_direct(struct xfs_inode *, loff_t, size_t,
+                                  int, struct xfs_bmbt_irec *, int *, int);
+extern int xfs_iomap_write_delay(struct xfs_inode *, loff_t, size_t, int,
+                                 struct xfs_bmbt_irec *, int *);
+extern int xfs_iomap_write_allocate(struct xfs_inode *,
+                                struct xfs_bmbt_irec *, int *);
+extern int xfs_iomap_write_unwritten(struct xfs_inode *, loff_t, size_t);
+
+#endif /* __XFS_IOMAP_H__*/