/*
   * Copyright (c) 2005-2006 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_AOPS_H__
  #define __XFS_AOPS_H__
  
  extern mempool_t *xfs_ioend_pool;
  
  /*
   * Types of I/O for bmap clustering and I/O completion tracking.
   */
  enum {
  	XFS_IO_DIRECT = 0,	/* special case for direct I/O ioends */
  	XFS_IO_DELALLOC,	/* covers delalloc region */
  	XFS_IO_UNWRITTEN,	/* covers allocated but uninitialized data */
  	XFS_IO_OVERWRITE,	/* covers already allocated extent */
  };
  
  #define XFS_IO_TYPES \
  	{ 0,			"" }, \
  	{ XFS_IO_DELALLOC,		"delalloc" }, \
  	{ XFS_IO_UNWRITTEN,		"unwritten" }, \
  	{ XFS_IO_OVERWRITE,		"overwrite" }
  
  /*
   * xfs_ioend struct manages large extent writes for XFS.
   * It can manage several multi-page bio's at once.
   */
  typedef struct xfs_ioend {
  	struct xfs_ioend	*io_list;	/* next ioend in chain */
  	unsigned int		io_type;	/* delalloc / unwritten */
  	int			io_error;	/* I/O error code */
  	atomic_t		io_remaining;	/* hold count */
  	unsigned int		io_isdirect : 1;/* direct I/O */
  	struct inode		*io_inode;	/* file being written to */
  	struct buffer_head	*io_buffer_head;/* buffer linked list head */
  	struct buffer_head	*io_buffer_tail;/* buffer linked list tail */
  	size_t			io_size;	/* size of the extent */
  	xfs_off_t		io_offset;	/* offset in the file */
  	struct work_struct	io_work;	/* xfsdatad work queue */
  	struct xfs_trans	*io_append_trans;/* xact. for size update */
  } xfs_ioend_t;
  
  extern const struct address_space_operations xfs_address_space_operations;
  extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
  
  extern void xfs_count_page_state(struct page *, int *, int *);
  
  #endif /* __XFS_AOPS_H__ */