306 lines
7.1 KiB
C
306 lines
7.1 KiB
C
/* $NetBSD: kernfs_vfsops.c,v 1.73 2006/10/12 01:32:26 christos 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 1.73 2006/10/12 01:32:26 christos 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 <miscfs/specfs/specdev.h>
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#include <miscfs/kernfs/kernfs.h>
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MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");
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dev_t rrootdev = NODEV;
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void kernfs_init(void);
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void kernfs_reinit(void);
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void kernfs_done(void);
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void kernfs_get_rrootdev(void);
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int kernfs_mount(struct mount *, const char *, void *,
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struct nameidata *, struct lwp *);
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int kernfs_start(struct mount *, int, struct lwp *);
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int kernfs_unmount(struct mount *, int, struct lwp *);
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int kernfs_statvfs(struct mount *, struct statvfs *, struct lwp *);
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int kernfs_quotactl(struct mount *, int, uid_t, void *,
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struct lwp *);
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int kernfs_sync(struct mount *, int, kauth_cred_t, struct lwp *);
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int kernfs_vget(struct mount *, ino_t, struct vnode **);
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void
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kernfs_init()
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{
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#ifdef _LKM
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malloc_type_attach(M_KERNFSMNT);
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#endif
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kernfs_hashinit();
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}
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void
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kernfs_reinit()
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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()
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{
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#ifdef _LKM
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malloc_type_detach(M_KERNFSMNT);
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#endif
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kernfs_hashdone();
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}
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void
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kernfs_get_rrootdev()
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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 __unused,
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struct nameidata *ndp __unused, struct lwp *l)
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{
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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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return 0;
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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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MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
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M_KERNFSMNT, M_WAITOK);
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memset(fmp, 0, sizeof(*fmp));
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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, 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 __unused, int flags __unused,
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struct lwp *l __unused)
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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, struct lwp *l __unused)
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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(mp, vpp)
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struct mount *mp;
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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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int
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kernfs_quotactl(struct mount *mp __unused, int cmd __unused, uid_t uid __unused,
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void *arg __unused, struct lwp *l __unused)
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{
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return (EOPNOTSUPP);
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}
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int
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kernfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l __unused)
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{
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sbp->f_bsize = DEV_BSIZE;
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sbp->f_frsize = DEV_BSIZE;
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sbp->f_iosize = DEV_BSIZE;
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sbp->f_blocks = 2; /* 1K to keep df happy */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_bresvd = 0;
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sbp->f_files = 1024; /* XXX lie */
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sbp->f_ffree = 128; /* XXX lie */
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sbp->f_favail = 128; /* XXX lie */
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sbp->f_fresvd = 0;
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copy_statvfs_info(sbp, mp);
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return (0);
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}
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/*ARGSUSED*/
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int
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kernfs_sync(struct mount *mp __unused, int waitfor __unused,
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kauth_cred_t uc __unused, struct lwp *l __unused)
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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 __unused, ino_t ino __unused,
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struct vnode **vpp __unused)
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{
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return (EOPNOTSUPP);
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}
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SYSCTL_SETUP(sysctl_vfs_kernfs_setup, "sysctl vfs.kern subtree setup")
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{
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sysctl_createv(clog, 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(clog, 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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}
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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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kernfs_mount,
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kernfs_start,
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kernfs_unmount,
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kernfs_root,
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kernfs_quotactl,
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kernfs_statvfs,
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kernfs_sync,
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kernfs_vget,
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NULL, /* vfs_fhtovp */
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NULL, /* 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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kernfs_vnodeopv_descs,
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0,
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{ NULL, NULL },
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};
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VFS_ATTACH(kernfs_vfsops);
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