286 lines
7.0 KiB
C
286 lines
7.0 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* $Id: kernfs_vfsops.c,v 1.23 1998/09/07 13:17:01 bde Exp $
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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/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.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/malloc.h>
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#include <miscfs/kernfs/kernfs.h>
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static MALLOC_DEFINE(M_KERNFSMNT, "KERNFS mount", "KERNFS mount structure");
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dev_t rrootdev = NODEV;
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static void kernfs_get_rrootdev __P((void));
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static int kernfs_init __P((struct vfsconf *vfsp));
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static int kernfs_mount __P((struct mount *mp, char *path, caddr_t data,
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struct nameidata *ndp, struct proc *p));
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static int kernfs_start __P((struct mount *mp, int flags, struct proc *p));
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static int kernfs_unmount __P((struct mount *mp, int mntflags,
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struct proc *p));
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static int kernfs_root __P((struct mount *mp, struct vnode **vpp));
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static int kernfs_statfs __P((struct mount *mp, struct statfs *sbp,
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struct proc *p));
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static int
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kernfs_init(vfsp)
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struct vfsconf *vfsp;
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{
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return (0);
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}
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static void
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kernfs_get_rrootdev()
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{
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static int tried = 0;
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int bmaj = major(rootdev);
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int cmaj;
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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 (!bdevsw[bmaj]) {
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panic("root dev has no bdevsw");
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}
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if (rootdev == NODEV)
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return;
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for (cmaj = 0; cmaj < nchrdev; cmaj++) {
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rrootdev = makedev(cmaj, minor(rootdev));
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if (chrtoblk(rrootdev) == rootdev)
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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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static int
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kernfs_mount(mp, path, data, ndp, p)
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struct mount *mp;
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char *path;
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caddr_t 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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u_int size;
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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 = %x)\n", mp);
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#endif
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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); /* XXX */
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error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); /* XXX */
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if (error) {
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FREE(fmp, M_KERNFSMNT);
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return (error);
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}
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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 = %x\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 = (qaddr_t) fmp;
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vfs_getnewfsid(mp);
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(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
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bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
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bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
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(void)kernfs_statfs(mp, &mp->mnt_stat, 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 (0);
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}
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static 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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static 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 = %x)\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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error = vflush(mp, rootvp, flags);
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if (error)
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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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* Release reference on underlying root vnode
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*/
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vrele(rootvp);
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/*
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* And blow it away for future re-use
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*/
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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); /* XXX */
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mp->mnt_data = 0;
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return 0;
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}
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static 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 proc *p = curproc; /* XXX */
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struct vnode *vp;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_root(mp = %x)\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, p);
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*vpp = vp;
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return (0);
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}
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static 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 = %x)\n", mp);
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#endif
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sbp->f_flags = 0;
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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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if (sbp != &mp->mnt_stat) {
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sbp->f_type = mp->mnt_vfc->vfc_typenum;
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bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
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bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
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}
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return (0);
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}
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static struct vfsops kernfs_vfsops = {
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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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};
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VFS_SET(kernfs_vfsops, kernfs, VFCF_SYNTHETIC);
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