/*

   * Copyright (c) 2000-2002,2005-2006 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

   */

  #include "xfs.h"

  #include "xfs_vnodeops.h"

  #include "xfs_bmap_btree.h"

  #include "xfs_inode.h"

  #include "xfs_trace.h"

  /*
   * note: all filemap functions return negative error codes. These
   * need to be inverted before returning to the xfs core functions.
   */

  void

  xfs_tosspages(
  	xfs_inode_t	*ip,

  	xfs_off_t	first,
  	xfs_off_t	last,
  	int		fiopt)
  {

  	/* can't toss partial tail pages, so mask them out */
  	last &= ~(PAGE_SIZE - 1);
  	truncate_inode_pages_range(VFS_I(ip)->i_mapping, first, last - 1);

  }

  int

  xfs_flushinval_pages(
  	xfs_inode_t	*ip,

  	xfs_off_t	first,
  	xfs_off_t	last,
  	int		fiopt)
  {

  	struct address_space *mapping = VFS_I(ip)->i_mapping;

  	int		ret = 0;

  	trace_xfs_pagecache_inval(ip, first, last);

  	xfs_iflags_clear(ip, XFS_ITRUNCATED);
  	ret = filemap_write_and_wait_range(mapping, first,
  				last == -1 ? LLONG_MAX : last);
  	if (!ret)
  		truncate_inode_pages_range(mapping, first, last);

  	return -ret;

  }

  int

  xfs_flush_pages(
  	xfs_inode_t	*ip,

  	xfs_off_t	first,
  	xfs_off_t	last,
  	uint64_t	flags,
  	int		fiopt)
  {

  	struct address_space *mapping = VFS_I(ip)->i_mapping;

  	int		ret = 0;
  	int		ret2;

  	xfs_iflags_clear(ip, XFS_ITRUNCATED);
  	ret = -filemap_fdatawrite_range(mapping, first,
  				last == -1 ? LLONG_MAX : last);

  	if (flags & XBF_ASYNC)

  		return ret;
  	ret2 = xfs_wait_on_pages(ip, first, last);
  	if (!ret)
  		ret = ret2;
  	return ret;

  }
  
  int
  xfs_wait_on_pages(
  	xfs_inode_t	*ip,
  	xfs_off_t	first,
  	xfs_off_t	last)
  {
  	struct address_space *mapping = VFS_I(ip)->i_mapping;

  	if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) {
  		return -filemap_fdatawait_range(mapping, first,
  					last == -1 ? ip->i_size - 1 : last);
  	}

  	return 0;

  }