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Combine the XFS and Linux inodes

To avoid issues with different lifecycles of XFS and Linux inodes,
embedd the linux inode inside the XFS inode. This means that the
linux inode has the same lifecycle as the XFS inode, even when it
has been released by the OS. XFS inodes don't live much longer than
this (a short stint in reclaim at most), so there isn't significant
memory usage penalties here.

Version 3
o kill xfs_icount()

Version 2
o remove unused commented out code from xfs_iget().
o kill useless cast in VFS_I()

Signed-off-by: Dave Chinner <david@fromorbit.com>
Merge of xfs-linux-melb:xfs-kern:32323a by kenmcd.

  Combine the XFS and Linux inodes

/*
 * 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
 */
#include "xfs.h"
#include "xfs_vnodeops.h"
#include "xfs_bmap_btree.h"
#include "xfs_inode.h"

/*
 * And this gunk is needed for xfs_mount.h"
 */
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_dmapi.h"
#include "xfs_inum.h"
#include "xfs_ag.h"
#include "xfs_mount.h"


/*
 * Dedicated vnode inactive/reclaim sync wait queues.
 * Prime number of hash buckets since address is used as the key.
 */
#define NVSYNC                  37
#define vptosync(v)             (&vsync[((unsigned long)v) % NVSYNC])
static wait_queue_head_t vsync[NVSYNC];

void __init
vn_init(void)
{
	int i;

	for (i = 0; i < NVSYNC; i++)
		init_waitqueue_head(&vsync[i]);
}

void
vn_iowait(
	xfs_inode_t	*ip)
{
	wait_queue_head_t *wq = vptosync(ip);

	wait_event(*wq, (atomic_read(&ip->i_iocount) == 0));
}

void
vn_iowake(
	xfs_inode_t	*ip)
{
	if (atomic_dec_and_test(&ip->i_iocount))
		wake_up(vptosync(ip));
}

/*
 * Volume managers supporting multiple paths can send back ENODEV when the
 * final path disappears.  In this case continuing to fill the page cache
 * with dirty data which cannot be written out is evil, so prevent that.
 */
void
vn_ioerror(
	xfs_inode_t	*ip,
	int		error,
	char		*f,
	int		l)
{
	if (unlikely(error == -ENODEV))
		xfs_do_force_shutdown(ip->i_mount, SHUTDOWN_DEVICE_REQ, f, l);
}

#ifdef	XFS_INODE_TRACE

#define KTRACE_ENTER(ip, vk, s, line, ra)			\
	ktrace_enter(	(ip)->i_trace,				\
/*  0 */		(void *)(__psint_t)(vk),		\
/*  1 */		(void *)(s),				\
/*  2 */		(void *)(__psint_t) line,		\
/*  3 */		(void *)(__psint_t)atomic_read(&VFS_I(ip)->i_count), \
/*  4 */		(void *)(ra),				\
/*  5 */		NULL,					\
/*  6 */		(void *)(__psint_t)current_cpu(),	\
/*  7 */		(void *)(__psint_t)current_pid(),	\
/*  8 */		(void *)__return_address,		\
/*  9 */		NULL, NULL, NULL, NULL, NULL, NULL, NULL)

/*
 * Vnode tracing code.
 */
void
_xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
{
	KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
}

void
_xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
{
	KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
}

void
xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
	KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
}

void
_xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
	KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
}

void
xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
	KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
}
#endif	/* XFS_INODE_TRACE */