/*
 * Copyright (c) 1989, 1993, 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)nfs_vfsops.c	8.12 (Berkeley) 5/20/95
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/nfsclient/nfs_vfsops.c,v 1.149 2004/04/07 04:59:56 imp Exp $");

#include "opt_bootp.h"
#include "opt_nfsroot.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>

#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>

#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>

#include <rpcx/rpcclnt.h>

#include <nfsx/rpcv2.h>
#include <nfsx/nfsproto.h>

#include <nfsxclient/nfs.h>
#include <nfsxclient/nfsnode.h>
#include <nfsxclient/nfsmount.h>
#include <nfsx/xdr_subs.h>
#include <nfsxclient/nfsm_subs.h>
#include <nfsxclient/nfsdiskless.h>
#include <nfsxclient/nfs_vfsops.h>

/* extern struct nfsstats nfsxstats; */
SYSCTL_NODE(_vfs, OID_AUTO, nfsx, CTLFLAG_RW, 0, "NFSx filesystem");
SYSCTL_STRUCT(_vfs_nfsx, NFS_NFSSTATS, nfsstats, CTLFLAG_RD,
    &nfsxstats, nfsstats, "S,nfsstats");

/*
 * Return root of a filesystem
 */
int
nfsx_root(struct mount *mp, struct vnode **vpp)
{
	struct vnode *vp;
	struct nfsmount *nmp;
	struct nfsnode *np;
	int error;

	nmp = VFSTONFS(mp);
	error = nfsx_nget(mp, (nfsfh_t *)&nmp->nm_fh, nmp->nm_fhsize, &np);
	if (error)
		return (error);
	vp = NFSTOV(np);
	/*
	 * Get transfer parameters and attributes for root vnode once.
	 */

	/* XXXMARIUS: version split */
#if 0
	if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 &&
	    (nmp->nm_flag & NFSMNT_NFSV3))
 		nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread);
#endif
	if (vp->v_type == VNON)
		vp->v_type = VDIR;
	vp->v_vflag |= VV_ROOT;
	*vpp = vp;
	return (0);
}

/*
 * Flush out the buffer cache
 */
/* ARGSUSED */
int
nfsx_sync(struct mount *mp, int waitfor, struct ucred *cred, struct thread *td)
{
	struct vnode *vp, *vnp;
	int error, allerror = 0;

	/*
	 * Force stale buffer cache information to be flushed.
	 */
	MNT_ILOCK(mp);
loop:
	for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist);
	     vp != NULL;
	     vp = vnp) {
		/*
		 * If the vnode that we are about to sync is no longer
		 * associated with this mount point, start over.
		 */
		if (vp->v_mount != mp)
			goto loop;
		vnp = TAILQ_NEXT(vp, v_nmntvnodes);
		VI_LOCK(vp);
		MNT_IUNLOCK(mp);
		if (VOP_ISLOCKED(vp, NULL) || TAILQ_EMPTY(&vp->v_dirtyblkhd) ||
		    waitfor == MNT_LAZY) {
			VI_UNLOCK(vp);
			MNT_ILOCK(mp);
			continue;
		}
		if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
			MNT_ILOCK(mp);
			goto loop;
		}
		error = VOP_FSYNC(vp, cred, waitfor, td);
		if (error)
			allerror = error;
		VOP_UNLOCK(vp, 0, td);
		vrele(vp);

		MNT_ILOCK(mp);
	}
	MNT_IUNLOCK(mp);
	return (allerror);
}