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move v_trace from bhv_vnode to xfs_inode

struct bhv_vnode is on it's way out, so move the trace buffer to the
XFS inode.  Note that this makes the tracing macros rather misnamed,
but this kind of fallout will be fixed up incrementally later on.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:29498a by kenmcd.

  move v_trace from bhv_vnode to xfs_inode

/*
 * 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"

uint64_t vn_generation;		/* vnode generation number */
DEFINE_SPINLOCK(vnumber_lock);

/*
 * Dedicated vnode inactive/reclaim sync semaphores.
 * 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
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)
{
	bhv_vfs_t	*vfsp = XFS_MTOVFS(ip->i_mount);

	if (unlikely(error == -ENODEV))
		bhv_vfs_force_shutdown(vfsp, SHUTDOWN_DEVICE_REQ, f, l);
}

bhv_vnode_t *
vn_initialize(
	struct inode	*inode)
{
	bhv_vnode_t	*vp = vn_from_inode(inode);

	XFS_STATS_INC(vn_active);
	XFS_STATS_INC(vn_alloc);

	spin_lock(&vnumber_lock);
	if (!++vn_generation)	/* v_number shouldn't be zero */
		vn_generation++;
	vp->v_number = vn_generation;
	spin_unlock(&vnumber_lock);

	ASSERT(VN_CACHED(vp) == 0);

	return vp;
}

/*
 * Revalidate the Linux inode from the vattr.
 * Note: i_size _not_ updated; we must hold the inode
 * semaphore when doing that - callers responsibility.
 */
void
vn_revalidate_core(
	bhv_vnode_t	*vp,
	bhv_vattr_t	*vap)
{
	struct inode	*inode = vn_to_inode(vp);

	inode->i_mode	    = vap->va_mode;
	inode->i_nlink	    = vap->va_nlink;
	inode->i_uid	    = vap->va_uid;
	inode->i_gid	    = vap->va_gid;
	inode->i_blocks	    = vap->va_nblocks;
	inode->i_mtime	    = vap->va_mtime;
	inode->i_ctime	    = vap->va_ctime;
	if (vap->va_xflags & XFS_XFLAG_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;
	if (vap->va_xflags & XFS_XFLAG_APPEND)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;
	if (vap->va_xflags & XFS_XFLAG_SYNC)
		inode->i_flags |= S_SYNC;
	else
		inode->i_flags &= ~S_SYNC;
	if (vap->va_xflags & XFS_XFLAG_NOATIME)
		inode->i_flags |= S_NOATIME;
	else
		inode->i_flags &= ~S_NOATIME;
}

/*
 * Revalidate the Linux inode from the vnode.
 */
int
__vn_revalidate(
	bhv_vnode_t	*vp,
	bhv_vattr_t	*vattr)
{
	int		error;

	vn_trace_entry(xfs_vtoi(vp), __FUNCTION__, (inst_t *)__return_address);
	vattr->va_mask = XFS_AT_STAT | XFS_AT_XFLAGS;
	error = xfs_getattr(xfs_vtoi(vp), vattr, 0);
	if (likely(!error)) {
		vn_revalidate_core(vp, vattr);
		xfs_iflags_clear(xfs_vtoi(vp), XFS_IMODIFIED);
	}
	return -error;
}

int
vn_revalidate(
	bhv_vnode_t	*vp)
{
	bhv_vattr_t	vattr;

	return __vn_revalidate(vp, &vattr);
}

/*
 * Add a reference to a referenced vnode.
 */
bhv_vnode_t *
vn_hold(
	bhv_vnode_t	*vp)
{
	struct inode	*inode;

	XFS_STATS_INC(vn_hold);

	inode = igrab(vn_to_inode(vp));
	ASSERT(inode);

	return vp;
}

#ifdef	XFS_VNODE_TRACE

/*
 * Reference count of Linux inode if present, -1 if the xfs_inode
 * has no associated Linux inode.
 */
static inline int xfs_icount(struct xfs_inode *ip)
{
	bhv_vnode_t *vp = XFS_ITOV_NULL(ip);

	if (vp)
		return vn_count(vp);
	return -1;
}

#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)xfs_icount(ip),	\
/*  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
vn_trace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
{
	KTRACE_ENTER(ip, VNODE_KTRACE_ENTRY, func, 0, ra);
}

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

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

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

void
vn_trace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
	KTRACE_ENTER(ip, VNODE_KTRACE_RELE, file, line, ra);
}
#endif	/* XFS_VNODE_TRACE */