294 lines
6.4 KiB
C
294 lines
6.4 KiB
C
/* $NetBSD: kernfs_vfsops.c,v 1.90 2009/11/30 10:59:20 pooka Exp $ */
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/*
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* Copyright (c) 1992, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
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*/
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/*
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* Kernel params Filesystem
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.90 2009/11/30 10:59:20 pooka Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_compat_netbsd.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/conf.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/dirent.h>
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#include <sys/malloc.h>
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#include <sys/syslog.h>
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#include <sys/kauth.h>
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#include <sys/module.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/specfs/specdev.h>
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#include <miscfs/kernfs/kernfs.h>
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MODULE(MODULE_CLASS_VFS, kernfs, NULL);
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MALLOC_JUSTDEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");
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dev_t rrootdev = NODEV;
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VFS_PROTOS(kernfs);
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void kernfs_get_rrootdev(void);
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static struct sysctllog *kernfs_sysctl_log;
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void
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kernfs_init(void)
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{
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malloc_type_attach(M_KERNFSMNT);
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kernfs_hashinit();
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}
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void
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kernfs_reinit(void)
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{
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kernfs_hashreinit();
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}
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void
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kernfs_done(void)
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{
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kernfs_hashdone();
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malloc_type_detach(M_KERNFSMNT);
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}
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void
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kernfs_get_rrootdev(void)
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{
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static int tried = 0;
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if (tried) {
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/* Already did it once. */
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return;
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}
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tried = 1;
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if (rootdev == NODEV)
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return;
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rrootdev = devsw_blk2chr(rootdev);
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if (rrootdev != NODEV)
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return;
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rrootdev = NODEV;
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printf("kernfs_get_rrootdev: no raw root device\n");
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}
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/*
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* Mount the Kernel params filesystem
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*/
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int
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kernfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
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{
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struct lwp *l = curlwp;
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int error = 0;
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struct kernfs_mount *fmp;
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if (UIO_MX & (UIO_MX - 1)) {
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log(LOG_ERR, "kernfs: invalid directory entry size");
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return (EINVAL);
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}
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if (mp->mnt_flag & MNT_GETARGS) {
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*data_len = 0;
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return 0;
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}
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/*
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* Update is a no-op
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*/
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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fmp = malloc(sizeof(struct kernfs_mount), M_KERNFSMNT, M_WAITOK|M_ZERO);
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TAILQ_INIT(&fmp->nodelist);
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mp->mnt_stat.f_namemax = MAXNAMLEN;
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = fmp;
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vfs_getnewfsid(mp);
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if ((error = set_statvfs_info(path, UIO_USERSPACE, "kernfs",
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UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l)) != 0) {
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free(fmp, M_KERNFSMNT);
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return error;
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}
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kernfs_get_rrootdev();
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return 0;
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}
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int
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kernfs_start(struct mount *mp, int flags)
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{
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return (0);
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}
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int
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kernfs_unmount(struct mount *mp, int mntflags)
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{
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int error;
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int flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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if ((error = vflush(mp, 0, flags)) != 0)
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return (error);
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/*
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* Finally, throw away the kernfs_mount structure
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*/
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free(mp->mnt_data, M_KERNFSMNT);
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mp->mnt_data = NULL;
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return (0);
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}
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int
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kernfs_root(struct mount *mp, struct vnode **vpp)
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{
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/* setup "." */
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return (kernfs_allocvp(mp, vpp, KFSkern, &kern_targets[0], 0));
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}
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/*ARGSUSED*/
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int
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kernfs_sync(struct mount *mp, int waitfor,
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kauth_cred_t uc)
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{
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return (0);
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}
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/*
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* Kernfs flat namespace lookup.
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* Currently unsupported.
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*/
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int
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kernfs_vget(struct mount *mp, ino_t ino,
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struct vnode **vpp)
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{
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return (EOPNOTSUPP);
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}
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extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc;
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const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = {
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&kernfs_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops kernfs_vfsops = {
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MOUNT_KERNFS,
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0,
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kernfs_mount,
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kernfs_start,
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kernfs_unmount,
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kernfs_root,
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(void *)eopnotsupp, /* vfs_quotactl */
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genfs_statvfs,
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kernfs_sync,
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kernfs_vget,
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(void *)eopnotsupp, /* vfs_fhtovp */
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(void *)eopnotsupp, /* vfs_vptofh */
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kernfs_init,
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kernfs_reinit,
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kernfs_done,
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NULL, /* vfs_mountroot */
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(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
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vfs_stdextattrctl,
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(void *)eopnotsupp, /* vfs_suspendctl */
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genfs_renamelock_enter,
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genfs_renamelock_exit,
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(void *)eopnotsupp,
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kernfs_vnodeopv_descs,
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0,
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{ NULL, NULL },
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};
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static int
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kernfs_modcmd(modcmd_t cmd, void *arg)
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{
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int error;
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switch (cmd) {
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case MODULE_CMD_INIT:
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error = vfs_attach(&kernfs_vfsops);
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if (error != 0)
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break;
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sysctl_createv(&kernfs_sysctl_log, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "vfs", NULL,
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NULL, 0, NULL, 0,
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CTL_VFS, CTL_EOL);
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sysctl_createv(&kernfs_sysctl_log, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "kernfs",
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SYSCTL_DESCR("/kern file system"),
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NULL, 0, NULL, 0,
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CTL_VFS, 11, CTL_EOL);
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/*
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* XXX the "11" above could be dynamic, thereby eliminating one
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* more instance of the "number to vfs" mapping problem, but
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* "11" is the order as taken from sys/mount.h
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*/
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break;
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case MODULE_CMD_FINI:
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error = vfs_detach(&kernfs_vfsops);
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if (error != 0)
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break;
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sysctl_teardown(&kernfs_sysctl_log);
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break;
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default:
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error = ENOTTY;
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break;
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}
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return (error);
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}
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