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File: [cvs.NetBSD.org] / src / sys / miscfs / kernfs / kernfs_vfsops.c (download)

Revision 1.69, Fri Sep 23 12:10:33 2005 UTC (16 years, 2 months ago) by jmmv
Branch: MAIN
CVS Tags: yamt-vop-base3, yamt-vop-base2, yamt-vop-base, yamt-vop, yamt-readahead-pervnode, yamt-readahead-perfile, yamt-readahead-base3, yamt-readahead-base2, yamt-readahead-base, yamt-readahead, thorpej-vnode-attr-base, thorpej-vnode-attr, ktrace-lwp-base
Changes since 1.68: +4 -43 lines

Apply the NFS exports list rototill patch:

- Remove all NFS related stuff from file system specific code.
- Drop the vfs_checkexp hook and generalize it in the new nfs_check_export
  function, thus removing redundancy from all file systems.
- Move all NFS export-related stuff from kern/vfs_subr.c to the new
  file sys/nfs/nfs_export.c.  The former was becoming large and its code
  is always compiled, regardless of the build options.  Using the latter,
  the code is only compiled in when NFSSERVER is enabled.  While doing this,
  also make some functions in nfs_subs.c conditional to NFSSERVER.
- Add a new command in nfssvc(2), called NFSSVC_SETEXPORTSLIST, that takes a
  path and a set of export entries.  At the moment it can only clear the
  exports list or append entries, one by one, but it is done in a way that
  allows setting the whole set of entries atomically in the future (see the
  comment in mountd_set_exports_list or in doc/TODO).
- Change mountd(8) to use the nfssvc(2) system call instead of mount(2) so
  that it becomes file system agnostic.  In fact, all this whole thing was
  done to remove a 'XXX' block from this utility!
- Change the mount*, newfs and fsck* userland utilities to not deal with NFS
  exports initialization; done internally by the kernel when initializing
  the NFS support for each file system.
- Implement an interface for VFS (called VFS hooks) so that several kernel
  subsystems can run arbitrary code upon receipt of specific VFS events.
  At the moment, this only provides support for unmount and is used to
  destroy NFS exports lists from the file systems being unmounted, though it
  has room for extension.

Thanks go to yamt@, chs@, thorpej@, wrstuden@ and others for their comments
and advice in the development of this patch.

/*	$NetBSD: kernfs_vfsops.c,v 1.69 2005/09/23 12:10:33 jmmv 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. 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
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.69 2005/09/23 12:10:33 jmmv Exp $");

#ifdef _KERNEL_OPT
#include "opt_compat_netbsd.h"
#endif

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

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

MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");

dev_t rrootdev = NODEV;

void	kernfs_init(void);
void	kernfs_reinit(void);
void	kernfs_done(void);
void	kernfs_get_rrootdev(void);
int	kernfs_mount(struct mount *, const char *, void *,
	    struct nameidata *, struct proc *);
int	kernfs_start(struct mount *, int, struct proc *);
int	kernfs_unmount(struct mount *, int, struct proc *);
int	kernfs_statvfs(struct mount *, struct statvfs *, struct proc *);
int	kernfs_quotactl(struct mount *, int, uid_t, void *,
			     struct proc *);
int	kernfs_sync(struct mount *, int, struct ucred *, struct proc *);
int	kernfs_vget(struct mount *, ino_t, struct vnode **);

void
kernfs_init()
{
#ifdef _LKM
	malloc_type_attach(M_KERNFSMNT);
#endif
	kernfs_hashinit();
}

void
kernfs_reinit()
{
	kernfs_hashreinit();
}

void
kernfs_done()
{
#ifdef _LKM
	malloc_type_detach(M_KERNFSMNT);
#endif
	kernfs_hashdone();
}

void
kernfs_get_rrootdev()
{
	static int tried = 0;

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

	if (rootdev == NODEV)
		return;
	rrootdev = devsw_blk2chr(rootdev);
	if (rrootdev != NODEV)
		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;
	struct kernfs_mount *fmp;

	if (UIO_MX & (UIO_MX - 1)) {
		log(LOG_ERR, "kernfs: invalid directory entry size");
		return (EINVAL);
	}

	if (mp->mnt_flag & MNT_GETARGS)
		return 0;
	/*
	 * Update is a no-op
	 */
	if (mp->mnt_flag & MNT_UPDATE)
		return (EOPNOTSUPP);

	MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
	    M_KERNFSMNT, M_WAITOK);
	memset(fmp, 0, sizeof(*fmp));
	TAILQ_INIT(&fmp->nodelist);

	mp->mnt_stat.f_namemax = MAXNAMLEN;
	mp->mnt_flag |= MNT_LOCAL;
	mp->mnt_data = fmp;
	vfs_getnewfsid(mp);

	if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs",
	    UIO_SYSSPACE, mp, p)) != 0) {
		free(fmp, M_KERNFSMNT);
		return error;
	}

	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;

	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;

	if ((error = vflush(mp, 0, flags)) != 0)
		return (error);

	/*
	 * Finally, throw away the kernfs_mount structure
	 */
	free(mp->mnt_data, M_KERNFSMNT);
	mp->mnt_data = NULL;
	return (0);
}

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

	/* setup "." */
	return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0));
}

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

	return (EOPNOTSUPP);
}

int
kernfs_statvfs(mp, sbp, p)
	struct mount *mp;
	struct statvfs *sbp;
	struct proc *p;
{

	sbp->f_bsize = DEV_BSIZE;
	sbp->f_frsize = 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_bresvd = 0;
	sbp->f_files = 1024;	/* XXX lie */
	sbp->f_ffree = 128;	/* XXX lie */
	sbp->f_favail = 128;	/* XXX lie */
	sbp->f_fresvd = 0;
	copy_statvfs_info(sbp, mp);
	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);
}

SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup")
{

	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "vfs", NULL,
		       NULL, 0, NULL, 0,
		       CTL_VFS, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "kernfs",
		       SYSCTL_DESCR("/kern file system"),
		       NULL, 0, NULL, 0,
		       CTL_VFS, 11, CTL_EOL);
	/*
	 * XXX the "11" above could be dynamic, thereby eliminating one
	 * more instance of the "number to vfs" mapping problem, but
	 * "11" is the order as taken from sys/mount.h
	 */
}

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_statvfs,
	kernfs_sync,
	kernfs_vget,
	NULL,				/* vfs_fhtovp */
	NULL,				/* vfs_vptofh */
	kernfs_init,
	kernfs_reinit,
	kernfs_done,
	NULL,				/* vfs_mountroot */
	(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
	vfs_stdextattrctl,
	kernfs_vnodeopv_descs,
};
VFS_ATTACH(kernfs_vfsops);