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kernfs_vfsops.c revision 1.50
      1  1.50   darrenr /*	$NetBSD: kernfs_vfsops.c,v 1.50 2003/06/28 14:22:02 darrenr Exp $	*/
      2  1.18       cgd 
      3   1.1       cgd /*
      4  1.32      fvdl  * Copyright (c) 1992, 1993, 1995
      5  1.15   mycroft  *	The Regents of the University of California.  All rights reserved.
      6   1.1       cgd  *
      7  1.11       cgd  * This code is derived from software donated to Berkeley by
      8   1.1       cgd  * Jan-Simon Pendry.
      9   1.1       cgd  *
     10   1.2       cgd  * Redistribution and use in source and binary forms, with or without
     11   1.2       cgd  * modification, are permitted provided that the following conditions
     12   1.2       cgd  * are met:
     13   1.2       cgd  * 1. Redistributions of source code must retain the above copyright
     14   1.2       cgd  *    notice, this list of conditions and the following disclaimer.
     15   1.2       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     16   1.2       cgd  *    notice, this list of conditions and the following disclaimer in the
     17   1.2       cgd  *    documentation and/or other materials provided with the distribution.
     18   1.2       cgd  * 3. All advertising materials mentioning features or use of this software
     19   1.2       cgd  *    must display the following acknowledgement:
     20  1.11       cgd  *	This product includes software developed by the University of
     21  1.11       cgd  *	California, Berkeley and its contributors.
     22   1.2       cgd  * 4. Neither the name of the University nor the names of its contributors
     23   1.2       cgd  *    may be used to endorse or promote products derived from this software
     24   1.2       cgd  *    without specific prior written permission.
     25   1.1       cgd  *
     26   1.2       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27   1.2       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28   1.2       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29   1.2       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30   1.2       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31   1.2       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32   1.2       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33   1.2       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34   1.2       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35   1.2       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36   1.2       cgd  * SUCH DAMAGE.
     37   1.1       cgd  *
     38  1.32      fvdl  *	@(#)kernfs_vfsops.c	8.10 (Berkeley) 5/14/95
     39   1.1       cgd  */
     40   1.1       cgd 
     41   1.1       cgd /*
     42   1.1       cgd  * Kernel params Filesystem
     43   1.1       cgd  */
     44  1.42     lukem 
     45  1.42     lukem #include <sys/cdefs.h>
     46  1.50   darrenr __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.50 2003/06/28 14:22:02 darrenr Exp $");
     47  1.33  jonathan 
     48  1.40       mrg #if defined(_KERNEL_OPT)
     49  1.33  jonathan #include "opt_compat_netbsd.h"
     50  1.33  jonathan #endif
     51   1.1       cgd 
     52   1.9   mycroft #include <sys/param.h>
     53   1.9   mycroft #include <sys/systm.h>
     54  1.15   mycroft #include <sys/conf.h>
     55   1.9   mycroft #include <sys/proc.h>
     56   1.9   mycroft #include <sys/vnode.h>
     57   1.9   mycroft #include <sys/mount.h>
     58   1.9   mycroft #include <sys/namei.h>
     59   1.9   mycroft #include <sys/malloc.h>
     60  1.15   mycroft 
     61  1.15   mycroft #include <miscfs/specfs/specdev.h>
     62   1.9   mycroft #include <miscfs/kernfs/kernfs.h>
     63   1.1       cgd 
     64  1.47   thorpej MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");
     65  1.47   thorpej 
     66  1.15   mycroft dev_t rrootdev = NODEV;
     67  1.15   mycroft 
     68  1.25  christos void	kernfs_init __P((void));
     69  1.36  jdolecek void	kernfs_done __P((void));
     70  1.25  christos void	kernfs_get_rrootdev __P((void));
     71  1.29       cgd int	kernfs_mount __P((struct mount *, const char *, void *,
     72  1.50   darrenr 	    struct nameidata *, struct lwp *));
     73  1.50   darrenr int	kernfs_start __P((struct mount *, int, struct lwp *));
     74  1.50   darrenr int	kernfs_unmount __P((struct mount *, int, struct lwp *));
     75  1.50   darrenr int	kernfs_root __P((struct mount *, struct vnode **, struct lwp *));
     76  1.50   darrenr int	kernfs_statfs __P((struct mount *, struct statfs *, struct lwp *));
     77  1.25  christos int	kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t,
     78  1.50   darrenr 			     struct lwp *));
     79  1.50   darrenr int	kernfs_sync __P((struct mount *, int, struct ucred *, struct lwp *));
     80  1.50   darrenr int	kernfs_vget __P((struct mount *, ino_t, struct vnode **, struct lwp *));
     81  1.50   darrenr int	kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **,
     82  1.50   darrenr 			   struct lwp *));
     83  1.35  wrstuden int	kernfs_checkexp __P((struct mount *, struct mbuf *, int *,
     84  1.35  wrstuden 			   struct ucred **));
     85  1.25  christos int	kernfs_vptofh __P((struct vnode *, struct fid *));
     86  1.32      fvdl int	kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t,
     87  1.50   darrenr 			   struct lwp *));
     88  1.25  christos 
     89  1.25  christos void
     90   1.1       cgd kernfs_init()
     91   1.1       cgd {
     92  1.49  christos #ifdef _LKM
     93  1.49  christos 	malloc_type_attach(M_KERNFSMNT);
     94  1.49  christos #endif
     95  1.10       cgd }
     96  1.10       cgd 
     97  1.11       cgd void
     98  1.36  jdolecek kernfs_done()
     99  1.36  jdolecek {
    100  1.49  christos #ifdef _LKM
    101  1.49  christos 	malloc_type_detach(M_KERNFSMNT);
    102  1.49  christos #endif
    103  1.36  jdolecek }
    104  1.36  jdolecek 
    105  1.36  jdolecek void
    106  1.15   mycroft kernfs_get_rrootdev()
    107  1.10       cgd {
    108  1.16   mycroft 	static int tried = 0;
    109  1.10       cgd 
    110  1.16   mycroft 	if (tried) {
    111  1.15   mycroft 		/* Already did it once. */
    112  1.15   mycroft 		return;
    113  1.15   mycroft 	}
    114  1.16   mycroft 	tried = 1;
    115  1.16   mycroft 
    116  1.16   mycroft 	if (rootdev == NODEV)
    117  1.16   mycroft 		return;
    118  1.45   gehenna 	rrootdev = devsw_blk2chr(rootdev);
    119  1.45   gehenna 	if (rrootdev != NODEV) {
    120  1.39       mrg #ifdef KERNFS_DIAGNOSTIC
    121  1.39       mrg 	printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n",
    122  1.39       mrg 	    major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev));
    123  1.39       mrg #endif
    124  1.45   gehenna 		return;
    125  1.10       cgd 	}
    126  1.16   mycroft 	rrootdev = NODEV;
    127  1.28  christos 	printf("kernfs_get_rrootdev: no raw root device\n");
    128   1.1       cgd }
    129   1.1       cgd 
    130   1.1       cgd /*
    131  1.15   mycroft  * Mount the Kernel params filesystem
    132   1.1       cgd  */
    133  1.25  christos int
    134  1.50   darrenr kernfs_mount(mp, path, data, ndp, l)
    135   1.1       cgd 	struct mount *mp;
    136  1.29       cgd 	const char *path;
    137  1.29       cgd 	void *data;
    138   1.1       cgd 	struct nameidata *ndp;
    139  1.50   darrenr 	struct lwp *l;
    140   1.1       cgd {
    141   1.1       cgd 	int error = 0;
    142   1.1       cgd 	struct kernfs_mount *fmp;
    143   1.1       cgd 	struct vnode *rvp;
    144   1.1       cgd 
    145   1.1       cgd #ifdef KERNFS_DIAGNOSTIC
    146  1.30  christos 	printf("kernfs_mount(mp = %p)\n", mp);
    147   1.1       cgd #endif
    148   1.1       cgd 
    149  1.46  christos 	if (mp->mnt_flag & MNT_GETARGS)
    150  1.46  christos 		return 0;
    151   1.1       cgd 	/*
    152   1.1       cgd 	 * Update is a no-op
    153   1.1       cgd 	 */
    154   1.1       cgd 	if (mp->mnt_flag & MNT_UPDATE)
    155   1.1       cgd 		return (EOPNOTSUPP);
    156   1.1       cgd 
    157  1.25  christos 	error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp);
    158  1.25  christos 	if (error)
    159   1.1       cgd 		return (error);
    160   1.1       cgd 
    161  1.15   mycroft 	MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
    162  1.47   thorpej 	    M_KERNFSMNT, M_WAITOK);
    163   1.1       cgd 	rvp->v_type = VDIR;
    164   1.1       cgd 	rvp->v_flag |= VROOT;
    165   1.1       cgd #ifdef KERNFS_DIAGNOSTIC
    166  1.30  christos 	printf("kernfs_mount: root vp = %p\n", rvp);
    167   1.1       cgd #endif
    168   1.1       cgd 	fmp->kf_root = rvp;
    169   1.1       cgd 	mp->mnt_flag |= MNT_LOCAL;
    170  1.44     soren 	mp->mnt_data = fmp;
    171  1.37     assar 	vfs_getnewfsid(mp);
    172   1.1       cgd 
    173  1.48  christos 	error = set_statfs_info(path, UIO_USERSPACE, "kernfs", UIO_SYSSPACE,
    174  1.50   darrenr 	    mp, l);
    175   1.1       cgd #ifdef KERNFS_DIAGNOSTIC
    176  1.28  christos 	printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
    177   1.1       cgd #endif
    178  1.10       cgd 
    179  1.15   mycroft 	kernfs_get_rrootdev();
    180  1.48  christos 	return error;
    181   1.1       cgd }
    182   1.1       cgd 
    183  1.25  christos int
    184  1.50   darrenr kernfs_start(mp, flags, l)
    185   1.1       cgd 	struct mount *mp;
    186   1.1       cgd 	int flags;
    187  1.50   darrenr 	struct lwp *l;
    188   1.1       cgd {
    189  1.15   mycroft 
    190   1.1       cgd 	return (0);
    191   1.1       cgd }
    192   1.1       cgd 
    193  1.25  christos int
    194  1.50   darrenr kernfs_unmount(mp, mntflags, l)
    195   1.1       cgd 	struct mount *mp;
    196   1.1       cgd 	int mntflags;
    197  1.50   darrenr 	struct lwp *l;
    198   1.1       cgd {
    199   1.1       cgd 	int error;
    200   1.1       cgd 	int flags = 0;
    201   1.1       cgd 	struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
    202   1.1       cgd 
    203   1.1       cgd #ifdef KERNFS_DIAGNOSTIC
    204  1.30  christos 	printf("kernfs_unmount(mp = %p)\n", mp);
    205   1.1       cgd #endif
    206   1.1       cgd 
    207  1.32      fvdl 	 if (mntflags & MNT_FORCE)
    208   1.1       cgd 		flags |= FORCECLOSE;
    209   1.1       cgd 
    210   1.1       cgd 	/*
    211   1.1       cgd 	 * Clear out buffer cache.  I don't think we
    212   1.1       cgd 	 * ever get anything cached at this level at the
    213   1.1       cgd 	 * moment, but who knows...
    214   1.1       cgd 	 */
    215   1.1       cgd 	if (rootvp->v_usecount > 1)
    216   1.1       cgd 		return (EBUSY);
    217   1.1       cgd #ifdef KERNFS_DIAGNOSTIC
    218  1.28  christos 	printf("kernfs_unmount: calling vflush\n");
    219   1.1       cgd #endif
    220  1.25  christos 	if ((error = vflush(mp, rootvp, flags)) != 0)
    221   1.1       cgd 		return (error);
    222   1.1       cgd 
    223   1.1       cgd #ifdef KERNFS_DIAGNOSTIC
    224   1.1       cgd 	vprint("kernfs root", rootvp);
    225  1.15   mycroft #endif
    226   1.1       cgd 	/*
    227  1.15   mycroft 	 * Clean out the old root vnode for reuse.
    228   1.1       cgd 	 */
    229   1.1       cgd 	vrele(rootvp);
    230   1.1       cgd 	vgone(rootvp);
    231   1.1       cgd 	/*
    232   1.1       cgd 	 * Finally, throw away the kernfs_mount structure
    233   1.1       cgd 	 */
    234  1.47   thorpej 	free(mp->mnt_data, M_KERNFSMNT);
    235   1.1       cgd 	mp->mnt_data = 0;
    236  1.15   mycroft 	return (0);
    237   1.1       cgd }
    238   1.1       cgd 
    239  1.25  christos int
    240  1.50   darrenr kernfs_root(mp, vpp, l)
    241   1.1       cgd 	struct mount *mp;
    242   1.1       cgd 	struct vnode **vpp;
    243  1.50   darrenr 	struct lwp *l;
    244   1.1       cgd {
    245   1.1       cgd 	struct vnode *vp;
    246   1.1       cgd 
    247   1.1       cgd #ifdef KERNFS_DIAGNOSTIC
    248  1.30  christos 	printf("kernfs_root(mp = %p)\n", mp);
    249   1.1       cgd #endif
    250   1.1       cgd 
    251   1.1       cgd 	/*
    252   1.1       cgd 	 * Return locked reference to root.
    253   1.1       cgd 	 */
    254   1.1       cgd 	vp = VFSTOKERNFS(mp)->kf_root;
    255   1.1       cgd 	VREF(vp);
    256  1.32      fvdl 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
    257   1.1       cgd 	*vpp = vp;
    258   1.1       cgd 	return (0);
    259   1.1       cgd }
    260   1.1       cgd 
    261  1.25  christos int
    262  1.50   darrenr kernfs_quotactl(mp, cmd, uid, arg, l)
    263   1.1       cgd 	struct mount *mp;
    264   1.1       cgd 	int cmd;
    265   1.1       cgd 	uid_t uid;
    266   1.1       cgd 	caddr_t arg;
    267  1.50   darrenr 	struct lwp *l;
    268   1.1       cgd {
    269  1.15   mycroft 
    270   1.1       cgd 	return (EOPNOTSUPP);
    271   1.1       cgd }
    272   1.1       cgd 
    273  1.25  christos int
    274  1.50   darrenr kernfs_statfs(mp, sbp, l)
    275   1.1       cgd 	struct mount *mp;
    276   1.1       cgd 	struct statfs *sbp;
    277  1.50   darrenr 	struct lwp *l;
    278   1.1       cgd {
    279   1.1       cgd 
    280   1.1       cgd #ifdef KERNFS_DIAGNOSTIC
    281  1.30  christos 	printf("kernfs_statfs(mp = %p)\n", mp);
    282   1.1       cgd #endif
    283   1.1       cgd 
    284   1.1       cgd 	sbp->f_bsize = DEV_BSIZE;
    285  1.13       cgd 	sbp->f_iosize = DEV_BSIZE;
    286   1.1       cgd 	sbp->f_blocks = 2;		/* 1K to keep df happy */
    287   1.1       cgd 	sbp->f_bfree = 0;
    288   1.1       cgd 	sbp->f_bavail = 0;
    289  1.15   mycroft 	sbp->f_files = 0;
    290  1.15   mycroft 	sbp->f_ffree = 0;
    291  1.32      fvdl #ifdef COMPAT_09
    292  1.32      fvdl 	sbp->f_type = 7;
    293  1.32      fvdl #else
    294  1.32      fvdl 	sbp->f_type = 0;
    295  1.32      fvdl #endif
    296  1.48  christos 	copy_statfs_info(sbp, mp);
    297   1.1       cgd 	return (0);
    298   1.1       cgd }
    299   1.1       cgd 
    300  1.25  christos /*ARGSUSED*/
    301  1.25  christos int
    302  1.50   darrenr kernfs_sync(mp, waitfor, uc, l)
    303   1.1       cgd 	struct mount *mp;
    304   1.1       cgd 	int waitfor;
    305  1.25  christos 	struct ucred *uc;
    306  1.50   darrenr 	struct lwp *l;
    307   1.1       cgd {
    308  1.15   mycroft 
    309   1.1       cgd 	return (0);
    310   1.1       cgd }
    311   1.1       cgd 
    312  1.15   mycroft /*
    313  1.15   mycroft  * Kernfs flat namespace lookup.
    314  1.15   mycroft  * Currently unsupported.
    315  1.15   mycroft  */
    316  1.25  christos int
    317  1.50   darrenr kernfs_vget(mp, ino, vpp, l)
    318  1.15   mycroft 	struct mount *mp;
    319  1.15   mycroft 	ino_t ino;
    320  1.15   mycroft 	struct vnode **vpp;
    321  1.50   darrenr 	struct lwp *l;
    322  1.15   mycroft {
    323  1.15   mycroft 
    324  1.15   mycroft 	return (EOPNOTSUPP);
    325  1.15   mycroft }
    326  1.15   mycroft 
    327  1.25  christos /*ARGSUSED*/
    328  1.25  christos int
    329  1.50   darrenr kernfs_fhtovp(mp, fhp, vpp, l)
    330   1.1       cgd 	struct mount *mp;
    331   1.1       cgd 	struct fid *fhp;
    332  1.35  wrstuden 	struct vnode **vpp;
    333  1.50   darrenr 	struct lwp *l;
    334  1.35  wrstuden {
    335  1.35  wrstuden 
    336  1.35  wrstuden 	return (EOPNOTSUPP);
    337  1.35  wrstuden }
    338  1.35  wrstuden 
    339  1.35  wrstuden /*ARGSUSED*/
    340  1.35  wrstuden int
    341  1.35  wrstuden kernfs_checkexp(mp, mb, what, anon)
    342  1.35  wrstuden 	struct mount *mp;
    343  1.25  christos 	struct mbuf *mb;
    344  1.25  christos 	int *what;
    345  1.25  christos 	struct ucred **anon;
    346   1.1       cgd {
    347  1.15   mycroft 
    348   1.1       cgd 	return (EOPNOTSUPP);
    349   1.1       cgd }
    350   1.1       cgd 
    351  1.25  christos /*ARGSUSED*/
    352  1.25  christos int
    353   1.1       cgd kernfs_vptofh(vp, fhp)
    354   1.1       cgd 	struct vnode *vp;
    355   1.1       cgd 	struct fid *fhp;
    356   1.1       cgd {
    357  1.15   mycroft 
    358   1.1       cgd 	return (EOPNOTSUPP);
    359   1.1       cgd }
    360   1.1       cgd 
    361  1.32      fvdl int
    362  1.50   darrenr kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, l)
    363  1.32      fvdl 	int *name;
    364  1.32      fvdl 	u_int namelen;
    365  1.32      fvdl 	void *oldp;
    366  1.32      fvdl 	size_t *oldlenp;
    367  1.32      fvdl 	void *newp;
    368  1.32      fvdl 	size_t newlen;
    369  1.50   darrenr 	struct lwp *l;
    370  1.32      fvdl {
    371  1.32      fvdl 	return (EOPNOTSUPP);
    372  1.32      fvdl }
    373  1.32      fvdl 
    374  1.38  jdolecek extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc;
    375  1.31   thorpej 
    376  1.38  jdolecek const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = {
    377  1.31   thorpej 	&kernfs_vnodeop_opv_desc,
    378  1.31   thorpej 	NULL,
    379  1.31   thorpej };
    380  1.31   thorpej 
    381   1.1       cgd struct vfsops kernfs_vfsops = {
    382  1.12       cgd 	MOUNT_KERNFS,
    383   1.1       cgd 	kernfs_mount,
    384   1.1       cgd 	kernfs_start,
    385   1.1       cgd 	kernfs_unmount,
    386   1.1       cgd 	kernfs_root,
    387   1.1       cgd 	kernfs_quotactl,
    388   1.1       cgd 	kernfs_statfs,
    389   1.1       cgd 	kernfs_sync,
    390  1.15   mycroft 	kernfs_vget,
    391   1.1       cgd 	kernfs_fhtovp,
    392   1.1       cgd 	kernfs_vptofh,
    393   1.1       cgd 	kernfs_init,
    394  1.41       chs 	NULL,
    395  1.36  jdolecek 	kernfs_done,
    396  1.32      fvdl 	kernfs_sysctl,
    397  1.31   thorpej 	NULL,				/* vfs_mountroot */
    398  1.35  wrstuden 	kernfs_checkexp,
    399  1.31   thorpej 	kernfs_vnodeopv_descs,
    400   1.1       cgd };
    401