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stop updating inode->i_blocks

The VFS doesn't use i_blocks, it's only used by generic_fillattr and
the generic quota code which XFS doesn't use.  In XFS there is one use
to check whether we have an inline or out of line sumlink, but we can
replace that with a check of the XFS_IFINLINE inode flag.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:30391a by kenmcd.

  stop updating inode->i_blocks

/*
 * 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 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)
{
	if (unlikely(error == -ENODEV))
		xfs_do_force_shutdown(ip->i_mount, SHUTDOWN_DEVICE_REQ, f, l);
}

/*
 * Revalidate the Linux inode from the XFS inode.
 * Note: i_size _not_ updated; we must hold the inode
 * semaphore when doing that - callers responsibility.
 */
int
vn_revalidate(
	bhv_vnode_t		*vp)
{
	struct inode		*inode = vn_to_inode(vp);
	struct xfs_inode	*ip = XFS_I(inode);
	struct xfs_mount	*mp = ip->i_mount;
	unsigned long		xflags;

	xfs_itrace_entry(ip);

	if (XFS_FORCED_SHUTDOWN(mp))
		return -EIO;

	xfs_ilock(ip, XFS_ILOCK_SHARED);
	inode->i_mode	    = ip->i_d.di_mode;
	inode->i_nlink	    = ip->i_d.di_nlink;
	inode->i_uid	    = ip->i_d.di_uid;
	inode->i_gid	    = ip->i_d.di_gid;
	inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
	inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
	inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
	inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;

	xflags = xfs_ip2xflags(ip);
	if (xflags & XFS_XFLAG_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;
	if (xflags & XFS_XFLAG_APPEND)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;
	if (xflags & XFS_XFLAG_SYNC)
		inode->i_flags |= S_SYNC;
	else
		inode->i_flags &= ~S_SYNC;
	if (xflags & XFS_XFLAG_NOATIME)
		inode->i_flags |= S_NOATIME;
	else
		inode->i_flags &= ~S_NOATIME;
	xfs_iunlock(ip, XFS_ILOCK_SHARED);

	xfs_iflags_clear(ip, XFS_IMODIFIED);
	return 0;
}

/*
 * 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_INODE_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
_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 */