Return to kernfs_vfsops.c CVS log

Up to [cvs.NetBSD.org] / src / sys / miscfs / kernfs

add a new VFS op, vfs_reinit, which is called when desiredvnodes is
adjusted via sysctl.  file systems that have hash tables which are
sized based on the value of this variable now resize those hash tables
using the new value.  the max number of FFS softdeps is also recalculated.

convert various file systems to use the <sys/queue.h> macros for
their hash tables.

/*	$NetBSD: kernfs_vfsops.c,v 1.41 2001/09/15 16:12:58 chs Exp $	*/

/*
 * Copyright (c) 1992, 1993, 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 *
 *	@(#)kernfs_vfsops.c	8.10 (Berkeley) 5/14/95
 */

/*
 * Kernel params Filesystem
 */

#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/malloc.h>

#include <miscfs/specfs/specdev.h>
#include <miscfs/kernfs/kernfs.h>

dev_t rrootdev = NODEV;

void	kernfs_init __P((void));
void	kernfs_done __P((void));
void	kernfs_get_rrootdev __P((void));
int	kernfs_mount __P((struct mount *, const char *, void *,
	    struct nameidata *, struct proc *));
int	kernfs_start __P((struct mount *, int, struct proc *));
int	kernfs_unmount __P((struct mount *, int, struct proc *));
int	kernfs_root __P((struct mount *, struct vnode **));
int	kernfs_statfs __P((struct mount *, struct statfs *, struct proc *));
int	kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t,
			     struct proc *));
int	kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
int	kernfs_vget __P((struct mount *, ino_t, struct vnode **));
int	kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **));
int	kernfs_checkexp __P((struct mount *, struct mbuf *, int *,
			   struct ucred **));
int	kernfs_vptofh __P((struct vnode *, struct fid *));
int	kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t,
			   struct proc *));

void
kernfs_init()
{
}

void
kernfs_done()
{
}

void
kernfs_get_rrootdev()
{
	static int tried = 0;
	int cmaj;

	if (tried) {
		/* Already did it once. */
		return;
	}
	tried = 1;

	if (rootdev == NODEV)
		return;
	for (cmaj = 0; cmaj < nchrdev; cmaj++) {
		rrootdev = makedev(cmaj, minor(rootdev));
		if (chrtoblk(rrootdev) == rootdev) {
#ifdef KERNFS_DIAGNOSTIC
	printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n",
	    major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev));
#endif
			return;
		}
	}
	rrootdev = NODEV;
	printf("kernfs_get_rrootdev: no raw root device\n");
}

/*
 * Mount the Kernel params filesystem
 */
int
kernfs_mount(mp, path, data, ndp, p)
	struct mount *mp;
	const char *path;
	void *data;
	struct nameidata *ndp;
	struct proc *p;
{
	int error = 0;
	size_t size;
	struct kernfs_mount *fmp;
	struct vnode *rvp;

#ifdef KERNFS_DIAGNOSTIC
	printf("kernfs_mount(mp = %p)\n", mp);
#endif

	/*
	 * Update is a no-op
	 */
	if (mp->mnt_flag & MNT_UPDATE)
		return (EOPNOTSUPP);

	error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp);
	if (error)
		return (error);

	MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
	    M_MISCFSMNT, M_WAITOK);
	rvp->v_type = VDIR;
	rvp->v_flag |= VROOT;
#ifdef KERNFS_DIAGNOSTIC
	printf("kernfs_mount: root vp = %p\n", rvp);
#endif
	fmp->kf_root = rvp;
	mp->mnt_flag |= MNT_LOCAL;
	mp->mnt_data = (qaddr_t)fmp;
	vfs_getnewfsid(mp);

	(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
	memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size);
	memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN);
	memcpy(mp->mnt_stat.f_mntfromname, "kernfs", sizeof("kernfs"));
#ifdef KERNFS_DIAGNOSTIC
	printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
#endif

	kernfs_get_rrootdev();
	return (0);
}

int
kernfs_start(mp, flags, p)
	struct mount *mp;
	int flags;
	struct proc *p;
{

	return (0);
}

int
kernfs_unmount(mp, mntflags, p)
	struct mount *mp;
	int mntflags;
	struct proc *p;
{
	int error;
	int flags = 0;
	struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;

#ifdef KERNFS_DIAGNOSTIC
	printf("kernfs_unmount(mp = %p)\n", mp);
#endif

	 if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;

	/*
	 * Clear out buffer cache.  I don't think we
	 * ever get anything cached at this level at the
	 * moment, but who knows...
	 */
	if (rootvp->v_usecount > 1)
		return (EBUSY);
#ifdef KERNFS_DIAGNOSTIC
	printf("kernfs_unmount: calling vflush\n");
#endif
	if ((error = vflush(mp, rootvp, flags)) != 0)
		return (error);

#ifdef KERNFS_DIAGNOSTIC
	vprint("kernfs root", rootvp);
#endif
	/*
	 * Clean out the old root vnode for reuse.
	 */
	vrele(rootvp);
	vgone(rootvp);
	/*
	 * Finally, throw away the kernfs_mount structure
	 */
	free(mp->mnt_data, M_MISCFSMNT);
	mp->mnt_data = 0;
	return (0);
}

int
kernfs_root(mp, vpp)
	struct mount *mp;
	struct vnode **vpp;
{
	struct vnode *vp;

#ifdef KERNFS_DIAGNOSTIC
	printf("kernfs_root(mp = %p)\n", mp);
#endif

	/*
	 * Return locked reference to root.
	 */
	vp = VFSTOKERNFS(mp)->kf_root;
	VREF(vp);
	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
	*vpp = vp;
	return (0);
}

int
kernfs_quotactl(mp, cmd, uid, arg, p)
	struct mount *mp;
	int cmd;
	uid_t uid;
	caddr_t arg;
	struct proc *p;
{

	return (EOPNOTSUPP);
}

int
kernfs_statfs(mp, sbp, p)
	struct mount *mp;
	struct statfs *sbp;
	struct proc *p;
{

#ifdef KERNFS_DIAGNOSTIC
	printf("kernfs_statfs(mp = %p)\n", mp);
#endif

	sbp->f_bsize = DEV_BSIZE;
	sbp->f_iosize = DEV_BSIZE;
	sbp->f_blocks = 2;		/* 1K to keep df happy */
	sbp->f_bfree = 0;
	sbp->f_bavail = 0;
	sbp->f_files = 0;
	sbp->f_ffree = 0;
#ifdef COMPAT_09
	sbp->f_type = 7;
#else
	sbp->f_type = 0;
#endif
	if (sbp != &mp->mnt_stat) {
		memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid));
		memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN);
		memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN);
	}
	strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
	return (0);
}

/*ARGSUSED*/
int
kernfs_sync(mp, waitfor, uc, p)
	struct mount *mp;
	int waitfor;
	struct ucred *uc;
	struct proc *p;
{

	return (0);
}

/*
 * Kernfs flat namespace lookup.
 * Currently unsupported.
 */
int
kernfs_vget(mp, ino, vpp)
	struct mount *mp;
	ino_t ino;
	struct vnode **vpp;
{

	return (EOPNOTSUPP);
}

/*ARGSUSED*/
int
kernfs_fhtovp(mp, fhp, vpp)
	struct mount *mp;
	struct fid *fhp;
	struct vnode **vpp;
{

	return (EOPNOTSUPP);
}

/*ARGSUSED*/
int
kernfs_checkexp(mp, mb, what, anon)
	struct mount *mp;
	struct mbuf *mb;
	int *what;
	struct ucred **anon;
{

	return (EOPNOTSUPP);
}

/*ARGSUSED*/
int
kernfs_vptofh(vp, fhp)
	struct vnode *vp;
	struct fid *fhp;
{

	return (EOPNOTSUPP);
}

int
kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
	int *name;
	u_int namelen;
	void *oldp;
	size_t *oldlenp;
	void *newp;
	size_t newlen;
	struct proc *p;
{
	return (EOPNOTSUPP);
}

extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc;

const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = {
	&kernfs_vnodeop_opv_desc,
	NULL,
};

struct vfsops kernfs_vfsops = {
	MOUNT_KERNFS,
	kernfs_mount,
	kernfs_start,
	kernfs_unmount,
	kernfs_root,
	kernfs_quotactl,
	kernfs_statfs,
	kernfs_sync,
	kernfs_vget,
	kernfs_fhtovp,
	kernfs_vptofh,
	kernfs_init,
	NULL,
	kernfs_done,
	kernfs_sysctl,
	NULL,				/* vfs_mountroot */
	kernfs_checkexp,
	kernfs_vnodeopv_descs,
};