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kernfs_vfsops.c revision 1.75
      1 /*	$NetBSD: kernfs_vfsops.c,v 1.75 2006/12/09 16:11:52 chs Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993, 1995
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software donated to Berkeley by
      8  * Jan-Simon Pendry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)kernfs_vfsops.c	8.10 (Berkeley) 5/14/95
     35  */
     36 
     37 /*
     38  * Kernel params Filesystem
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.75 2006/12/09 16:11:52 chs Exp $");
     43 
     44 #ifdef _KERNEL_OPT
     45 #include "opt_compat_netbsd.h"
     46 #endif
     47 
     48 #include <sys/param.h>
     49 #include <sys/systm.h>
     50 #include <sys/sysctl.h>
     51 #include <sys/conf.h>
     52 #include <sys/proc.h>
     53 #include <sys/vnode.h>
     54 #include <sys/mount.h>
     55 #include <sys/namei.h>
     56 #include <sys/dirent.h>
     57 #include <sys/malloc.h>
     58 #include <sys/syslog.h>
     59 #include <sys/kauth.h>
     60 
     61 #include <miscfs/specfs/specdev.h>
     62 #include <miscfs/kernfs/kernfs.h>
     63 
     64 MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");
     65 
     66 dev_t rrootdev = NODEV;
     67 
     68 void	kernfs_init(void);
     69 void	kernfs_reinit(void);
     70 void	kernfs_done(void);
     71 void	kernfs_get_rrootdev(void);
     72 int	kernfs_mount(struct mount *, const char *, void *,
     73 	    struct nameidata *, struct lwp *);
     74 int	kernfs_start(struct mount *, int, struct lwp *);
     75 int	kernfs_unmount(struct mount *, int, struct lwp *);
     76 int	kernfs_statvfs(struct mount *, struct statvfs *, struct lwp *);
     77 int	kernfs_quotactl(struct mount *, int, uid_t, void *,
     78 			     struct lwp *);
     79 int	kernfs_sync(struct mount *, int, kauth_cred_t, struct lwp *);
     80 int	kernfs_vget(struct mount *, ino_t, struct vnode **);
     81 
     82 void
     83 kernfs_init()
     84 {
     85 #ifdef _LKM
     86 	malloc_type_attach(M_KERNFSMNT);
     87 #endif
     88 	kernfs_hashinit();
     89 }
     90 
     91 void
     92 kernfs_reinit()
     93 {
     94 	kernfs_hashreinit();
     95 }
     96 
     97 void
     98 kernfs_done()
     99 {
    100 #ifdef _LKM
    101 	malloc_type_detach(M_KERNFSMNT);
    102 #endif
    103 	kernfs_hashdone();
    104 }
    105 
    106 void
    107 kernfs_get_rrootdev()
    108 {
    109 	static int tried = 0;
    110 
    111 	if (tried) {
    112 		/* Already did it once. */
    113 		return;
    114 	}
    115 	tried = 1;
    116 
    117 	if (rootdev == NODEV)
    118 		return;
    119 	rrootdev = devsw_blk2chr(rootdev);
    120 	if (rrootdev != NODEV)
    121 		return;
    122 	rrootdev = NODEV;
    123 	printf("kernfs_get_rrootdev: no raw root device\n");
    124 }
    125 
    126 /*
    127  * Mount the Kernel params filesystem
    128  */
    129 int
    130 kernfs_mount(struct mount *mp, const char *path, void *data,
    131     struct nameidata *ndp, struct lwp *l)
    132 {
    133 	int error = 0;
    134 	struct kernfs_mount *fmp;
    135 
    136 	if (UIO_MX & (UIO_MX - 1)) {
    137 		log(LOG_ERR, "kernfs: invalid directory entry size");
    138 		return (EINVAL);
    139 	}
    140 
    141 	if (mp->mnt_flag & MNT_GETARGS)
    142 		return 0;
    143 	/*
    144 	 * Update is a no-op
    145 	 */
    146 	if (mp->mnt_flag & MNT_UPDATE)
    147 		return (EOPNOTSUPP);
    148 
    149 	MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
    150 	    M_KERNFSMNT, M_WAITOK);
    151 	memset(fmp, 0, sizeof(*fmp));
    152 	TAILQ_INIT(&fmp->nodelist);
    153 
    154 	mp->mnt_stat.f_namemax = MAXNAMLEN;
    155 	mp->mnt_flag |= MNT_LOCAL;
    156 	mp->mnt_data = fmp;
    157 	vfs_getnewfsid(mp);
    158 
    159 	if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs",
    160 	    UIO_SYSSPACE, mp, l)) != 0) {
    161 		free(fmp, M_KERNFSMNT);
    162 		return error;
    163 	}
    164 
    165 	kernfs_get_rrootdev();
    166 	return 0;
    167 }
    168 
    169 int
    170 kernfs_start(struct mount *mp, int flags,
    171     struct lwp *l)
    172 {
    173 
    174 	return (0);
    175 }
    176 
    177 int
    178 kernfs_unmount(struct mount *mp, int mntflags, struct lwp *l)
    179 {
    180 	int error;
    181 	int flags = 0;
    182 
    183 	if (mntflags & MNT_FORCE)
    184 		flags |= FORCECLOSE;
    185 
    186 	if ((error = vflush(mp, 0, flags)) != 0)
    187 		return (error);
    188 
    189 	/*
    190 	 * Finally, throw away the kernfs_mount structure
    191 	 */
    192 	free(mp->mnt_data, M_KERNFSMNT);
    193 	mp->mnt_data = NULL;
    194 	return (0);
    195 }
    196 
    197 int
    198 kernfs_root(mp, vpp)
    199 	struct mount *mp;
    200 	struct vnode **vpp;
    201 {
    202 
    203 	/* setup "." */
    204 	return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0));
    205 }
    206 
    207 int
    208 kernfs_quotactl(struct mount *mp, int cmd, uid_t uid,
    209     void *arg, struct lwp *l)
    210 {
    211 
    212 	return (EOPNOTSUPP);
    213 }
    214 
    215 int
    216 kernfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l)
    217 {
    218 
    219 	sbp->f_bsize = DEV_BSIZE;
    220 	sbp->f_frsize = DEV_BSIZE;
    221 	sbp->f_iosize = DEV_BSIZE;
    222 	sbp->f_blocks = 2;		/* 1K to keep df happy */
    223 	sbp->f_bfree = 0;
    224 	sbp->f_bavail = 0;
    225 	sbp->f_bresvd = 0;
    226 	sbp->f_files = 1024;	/* XXX lie */
    227 	sbp->f_ffree = 128;	/* XXX lie */
    228 	sbp->f_favail = 128;	/* XXX lie */
    229 	sbp->f_fresvd = 0;
    230 	copy_statvfs_info(sbp, mp);
    231 	return (0);
    232 }
    233 
    234 /*ARGSUSED*/
    235 int
    236 kernfs_sync(struct mount *mp, int waitfor,
    237     kauth_cred_t uc, struct lwp *l)
    238 {
    239 
    240 	return (0);
    241 }
    242 
    243 /*
    244  * Kernfs flat namespace lookup.
    245  * Currently unsupported.
    246  */
    247 int
    248 kernfs_vget(struct mount *mp, ino_t ino,
    249     struct vnode **vpp)
    250 {
    251 
    252 	return (EOPNOTSUPP);
    253 }
    254 
    255 SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup")
    256 {
    257 
    258 	sysctl_createv(clog, 0, NULL, NULL,
    259 		       CTLFLAG_PERMANENT,
    260 		       CTLTYPE_NODE, "vfs", NULL,
    261 		       NULL, 0, NULL, 0,
    262 		       CTL_VFS, CTL_EOL);
    263 	sysctl_createv(clog, 0, NULL, NULL,
    264 		       CTLFLAG_PERMANENT,
    265 		       CTLTYPE_NODE, "kernfs",
    266 		       SYSCTL_DESCR("/kern file system"),
    267 		       NULL, 0, NULL, 0,
    268 		       CTL_VFS, 11, CTL_EOL);
    269 	/*
    270 	 * XXX the "11" above could be dynamic, thereby eliminating one
    271 	 * more instance of the "number to vfs" mapping problem, but
    272 	 * "11" is the order as taken from sys/mount.h
    273 	 */
    274 }
    275 
    276 extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc;
    277 
    278 const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = {
    279 	&kernfs_vnodeop_opv_desc,
    280 	NULL,
    281 };
    282 
    283 struct vfsops kernfs_vfsops = {
    284 	MOUNT_KERNFS,
    285 	kernfs_mount,
    286 	kernfs_start,
    287 	kernfs_unmount,
    288 	kernfs_root,
    289 	kernfs_quotactl,
    290 	kernfs_statvfs,
    291 	kernfs_sync,
    292 	kernfs_vget,
    293 	(void *)eopnotsupp,		/* vfs_fhtovp */
    294 	(void *)eopnotsupp,		/* vfs_vptofh */
    295 	kernfs_init,
    296 	kernfs_reinit,
    297 	kernfs_done,
    298 	NULL,				/* vfs_mountroot */
    299 	(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
    300 	vfs_stdextattrctl,
    301 	kernfs_vnodeopv_descs,
    302 	0,
    303 	{ NULL, NULL },
    304 };
    305 VFS_ATTACH(kernfs_vfsops);
    306