393 lines
8.1 KiB
C
393 lines
8.1 KiB
C
/* $NetBSD: kernfs_vfsops.c,v 1.53 2003/08/07 16:32:37 agc 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 1.53 2003/08/07 16:32:37 agc Exp $");
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#if defined(_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/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/malloc.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 __P((void));
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void kernfs_done __P((void));
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void kernfs_get_rrootdev __P((void));
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int kernfs_mount __P((struct mount *, const char *, void *,
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struct nameidata *, struct proc *));
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int kernfs_start __P((struct mount *, int, struct proc *));
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int kernfs_unmount __P((struct mount *, int, struct proc *));
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int kernfs_root __P((struct mount *, struct vnode **));
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int kernfs_statfs __P((struct mount *, struct statfs *, struct proc *));
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int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t,
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struct proc *));
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int kernfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
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int kernfs_vget __P((struct mount *, ino_t, struct vnode **));
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int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **));
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int kernfs_checkexp __P((struct mount *, struct mbuf *, int *,
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struct ucred **));
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int kernfs_vptofh __P((struct vnode *, struct fid *));
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int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t,
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struct proc *));
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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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}
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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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}
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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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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n",
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major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev));
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#endif
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return;
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}
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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(mp, path, data, ndp, p)
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struct mount *mp;
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const char *path;
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void *data;
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struct nameidata *ndp;
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struct proc *p;
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{
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int error = 0;
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struct kernfs_mount *fmp;
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struct vnode *rvp;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_mount(mp = %p)\n", mp);
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#endif
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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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error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp);
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if (error)
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return (error);
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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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rvp->v_type = VDIR;
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rvp->v_flag |= VROOT;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_mount: root vp = %p\n", rvp);
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#endif
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fmp->kf_root = rvp;
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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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error = set_statfs_info(path, UIO_USERSPACE, "kernfs", UIO_SYSSPACE,
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mp, p);
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
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#endif
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kernfs_get_rrootdev();
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return error;
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}
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int
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kernfs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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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(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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int error;
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int flags = 0;
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struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_unmount(mp = %p)\n", mp);
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#endif
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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/*
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* Clear out buffer cache. I don't think we
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* ever get anything cached at this level at the
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* moment, but who knows...
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*/
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if (rootvp->v_usecount > 1)
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return (EBUSY);
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_unmount: calling vflush\n");
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#endif
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if ((error = vflush(mp, rootvp, flags)) != 0)
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return (error);
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#ifdef KERNFS_DIAGNOSTIC
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vprint("kernfs root", rootvp);
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#endif
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/*
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* Clean out the old root vnode for reuse.
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*/
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vrele(rootvp);
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vgone(rootvp);
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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 = 0;
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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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struct vnode *vp;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_root(mp = %p)\n", mp);
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#endif
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/*
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* Return locked reference to root.
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*/
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vp = VFSTOKERNFS(mp)->kf_root;
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VREF(vp);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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*vpp = vp;
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return (0);
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}
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int
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kernfs_quotactl(mp, cmd, uid, arg, p)
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struct mount *mp;
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int cmd;
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uid_t uid;
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caddr_t arg;
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struct proc *p;
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{
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return (EOPNOTSUPP);
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}
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int
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kernfs_statfs(mp, sbp, p)
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struct mount *mp;
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struct statfs *sbp;
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struct proc *p;
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{
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_statfs(mp = %p)\n", mp);
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#endif
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sbp->f_bsize = 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_files = 0;
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sbp->f_ffree = 0;
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#ifdef COMPAT_09
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sbp->f_type = 7;
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#else
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sbp->f_type = 0;
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#endif
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copy_statfs_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(mp, waitfor, uc, p)
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struct mount *mp;
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int waitfor;
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struct ucred *uc;
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struct proc *p;
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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(mp, ino, vpp)
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struct mount *mp;
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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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/*ARGSUSED*/
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int
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kernfs_fhtovp(mp, fhp, vpp)
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struct mount *mp;
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struct fid *fhp;
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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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/*ARGSUSED*/
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int
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kernfs_checkexp(mp, mb, what, anon)
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struct mount *mp;
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struct mbuf *mb;
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int *what;
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struct ucred **anon;
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{
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return (EOPNOTSUPP);
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}
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/*ARGSUSED*/
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int
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kernfs_vptofh(vp, fhp)
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struct vnode *vp;
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struct fid *fhp;
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{
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return (EOPNOTSUPP);
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}
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int
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kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
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int *name;
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u_int namelen;
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void *oldp;
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size_t *oldlenp;
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void *newp;
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size_t newlen;
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struct proc *p;
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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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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_statfs,
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kernfs_sync,
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kernfs_vget,
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kernfs_fhtovp,
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kernfs_vptofh,
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kernfs_init,
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NULL,
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kernfs_done,
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kernfs_sysctl,
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NULL, /* vfs_mountroot */
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kernfs_checkexp,
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kernfs_vnodeopv_descs,
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};
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