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Merge of 2.4.x-xfs:slinx:114782a by nathans.

  Prepare pagebuf APIs for multiple blocksize support.  In particular,
  the IO path needs to get access to blocksize information which currently
  is only held in the xfs_mount structure -- this change reorganises a few
  things so that the necessary information is available to the code that
  needs it.  We also no longer need pbm_dev field (pb_bmap_t) as this is
  now available from pb_target_t always.

/*
 * Copyright (c) 2000 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_LRW_H__
#define __XFS_LRW_H__

#define XFS_IOMAP_READ_ENTER	3
/*
 * Maximum count of bmaps used by read and write paths.
 */
#define	XFS_MAX_RW_NBMAPS	4

extern int xfs_bmap (bhv_desc_t *, xfs_off_t, ssize_t, int, struct cred *, pb_bmap_t *, int *);
extern int xfs_strategy (bhv_desc_t *, xfs_off_t, ssize_t, int, struct cred *, pb_bmap_t *, int *);
extern int xfsbdstrat (struct xfs_mount *, struct xfs_buf *);
extern int xfs_bdstrat_cb (struct xfs_buf *);

extern int xfs_zero_eof (vnode_t *, struct xfs_iocore *, xfs_off_t,
				xfs_fsize_t, xfs_fsize_t, struct pm *);
extern ssize_t xfs_read (
         struct bhv_desc        *bdp,
         struct uio             *uiop,
         int                    ioflag,
         struct cred            *credp,
         struct flid            *fl);

extern ssize_t xfs_write (
         struct bhv_desc        *bdp,
         struct uio             *uiop,
         int                    ioflag,
         struct cred            *credp,
         struct flid            *fl);

extern int xfs_release_page (
	struct bhv_desc		*bdp,
	struct page		*page);

extern int xfs_read_full_page (
	struct bhv_desc		*bdp,
	struct page		*page);

extern int xfs_write_full_page (
	struct bhv_desc		*bdp,
	struct page		*page);

extern int xfs_prepare_write (
	struct bhv_desc		*bdp,
	struct page		*page,
	unsigned int		from,
	unsigned int		to);

extern int xfs_commit_write (
	struct bhv_desc		*bdp,
	struct page		*page,
	unsigned int		from,
	unsigned int		to);

extern int xfs_recover_read_only (xlog_t *);
extern int xfs_quotacheck_read_only (xfs_mount_t *);

extern void XFS_log_write_unmount_ro (bhv_desc_t *);

#define XFS_FSB_TO_DB_IO(io,fsb) \
		(((io)->io_flags & XFS_IOCORE_RT) ? \
		 XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
		 XFS_FSB_TO_DADDR((io)->io_mount, (fsb)))

#endif	/* __XFS_LRW_H__ */