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kill unnessecary ioops indirection

Currently there is an indirection called ioops in the XFS data I/O
path.  Various functions are called by functions pointers, but there
is no coherence in what this is for, and of course for XFS itself
it's entirely unused.  This patch removes it instead and significantly
reduces source and binary size of XFS while making maintaince easier.
Merge of xfs-linux-melb:xfs-kern:29737a by kenmcd.

  kill unnessecary ioops indirection

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_LRW_H__
#define __XFS_LRW_H__

struct xfs_mount;
struct xfs_iocore;
struct xfs_inode;
struct xfs_bmbt_irec;
struct xfs_buf;
struct xfs_iomap;

#if defined(XFS_RW_TRACE)
/*
 * Defines for the trace mechanisms in xfs_lrw.c.
 */
#define	XFS_RW_KTRACE_SIZE	128

#define	XFS_READ_ENTER		1
#define	XFS_WRITE_ENTER		2
#define XFS_IOMAP_READ_ENTER	3
#define	XFS_IOMAP_WRITE_ENTER	4
#define	XFS_IOMAP_READ_MAP	5
#define	XFS_IOMAP_WRITE_MAP	6
#define	XFS_IOMAP_WRITE_NOSPACE	7
#define	XFS_ITRUNC_START	8
#define	XFS_ITRUNC_FINISH1	9
#define	XFS_ITRUNC_FINISH2	10
#define	XFS_CTRUNC1		11
#define	XFS_CTRUNC2		12
#define	XFS_CTRUNC3		13
#define	XFS_CTRUNC4		14
#define	XFS_CTRUNC5		15
#define	XFS_CTRUNC6		16
#define	XFS_BUNMAP		17
#define	XFS_INVAL_CACHED	18
#define	XFS_DIORD_ENTER		19
#define	XFS_DIOWR_ENTER		20
#define	XFS_WRITEPAGE_ENTER	22
#define	XFS_RELEASEPAGE_ENTER	23
#define	XFS_INVALIDPAGE_ENTER	24
#define	XFS_IOMAP_ALLOC_ENTER	25
#define	XFS_IOMAP_ALLOC_MAP	26
#define	XFS_IOMAP_UNWRITTEN	27
#define XFS_SPLICE_READ_ENTER	28
#define XFS_SPLICE_WRITE_ENTER	29
extern void xfs_rw_enter_trace(int, struct xfs_iocore *,
				void *, size_t, loff_t, int);
extern void xfs_inval_cached_trace(struct xfs_iocore *,
				xfs_off_t, xfs_off_t, xfs_off_t, xfs_off_t);
#else
#define xfs_rw_enter_trace(tag, io, data, size, offset, ioflags)
#define xfs_inval_cached_trace(io, offset, len, first, last)
#endif

extern int xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
extern int xfs_bdstrat_cb(struct xfs_buf *);
extern int xfs_dev_is_read_only(struct xfs_mount *, char *);

extern int xfs_zero_eof(struct xfs_inode *, xfs_off_t, xfs_fsize_t);

#endif	/* __XFS_LRW_H__ */