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In several places we directly convert from the XFS inode
to the linux (VFS) inode by a simple deference of ip->i_vnode.
We should not do this - a helper function should be used to
extract the VFS inode from the XFS inode.

Introduce the function VFS_I() to extract the VFS inode
from the XFS inode. The name was chosen to match XFS_I() which
is used to extract the XFS inode from the VFS inode.

Version 2:
o don't use vn_to_inode() and inode_to_vn() functions as they
  are not needed

Signed-off-by: Dave Chinner <david@fromorbit.com>
Merge of xfs-linux-melb:xfs-kern:31720a by kenmcd.

/*
 * 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_IOPS_H__
#define __XFS_IOPS_H__

extern const struct inode_operations xfs_inode_operations;
extern const struct inode_operations xfs_dir_inode_operations;
extern const struct inode_operations xfs_dir_ci_inode_operations;
extern const struct inode_operations xfs_symlink_inode_operations;

extern const struct file_operations xfs_file_operations;
extern const struct file_operations xfs_dir_file_operations;
extern const struct file_operations xfs_invis_file_operations;

extern ssize_t xfs_vn_listxattr(struct dentry *, char *data, size_t size);

struct xfs_inode;
extern void xfs_ichgtime(struct xfs_inode *, int);
extern void xfs_ichgtime_fast(struct xfs_inode *, struct inode *, int);

#endif /* __XFS_IOPS_H__ */