bbf3a56610
VFCF_NETWORK (this FS goes over the net) VFCF_READONLY (read-write mounts do not make any sense) VFCF_SYNTHETIC (data in this FS is not real) VFCF_LOOPBACK (this FS aliases something else) cd9660 is readonly; nullfs, umapfs, and union are loopback; NFS is netowkr; procfs, kernfs, and fdesc are synthetic.
319 lines
7.2 KiB
C
319 lines
7.2 KiB
C
/*
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* Copyright (c) 1992, 1993
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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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* @(#)portal_vfsops.c 8.6 (Berkeley) 1/21/94
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*
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* $Id: portal_vfsops.c,v 1.6 1995/03/16 18:13:38 bde Exp $
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*/
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/*
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* Portal 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/time.h>
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#include <sys/types.h>
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#include <sys/proc.h>
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#include <sys/filedesc.h>
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#include <sys/file.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 <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/domain.h>
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#include <sys/un.h>
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#include <miscfs/portal/portal.h>
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int
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portal_init()
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{
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return (0);
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}
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/*
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* Mount the per-process file descriptors (/dev/fd)
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*/
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int
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portal_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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struct file *fp;
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struct portal_args args;
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struct portalmount *fmp;
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struct socket *so;
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struct vnode *rvp;
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u_int size;
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int error;
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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 = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
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if (error)
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return (error);
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error = getsock(p->p_fd, args.pa_socket, &fp);
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if (error)
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return (error);
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so = (struct socket *) fp->f_data;
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if (so->so_proto->pr_domain->dom_family != AF_UNIX)
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return (ESOCKTNOSUPPORT);
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error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */
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if (error)
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return (error);
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MALLOC(rvp->v_data, void *, sizeof(struct portalnode),
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M_TEMP, M_WAITOK);
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fmp = (struct portalmount *) malloc(sizeof(struct portalmount),
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M_UFSMNT, M_WAITOK); /* XXX */
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rvp->v_type = VDIR;
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rvp->v_flag |= VROOT;
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VTOPORTAL(rvp)->pt_arg = 0;
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VTOPORTAL(rvp)->pt_size = 0;
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VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
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fmp->pm_root = rvp;
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fmp->pm_server = fp; fp->f_count++;
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = (qaddr_t) fmp;
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getnewfsid(mp, MOUNT_PORTAL);
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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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(void)copyinstr(args.pa_config,
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mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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#ifdef notdef
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bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
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bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
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#endif
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return (0);
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}
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int
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portal_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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portal_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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struct vnode *rootvp = VFSTOPORTAL(mp)->pm_root;
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int error, flags = 0;
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if (mntflags & MNT_FORCE) {
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/* portal can never be rootfs so don't check for it */
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if (!doforce)
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return (EINVAL);
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flags |= FORCECLOSE;
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}
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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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#ifdef notyet
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mntflushbuf(mp, 0);
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if (mntinvalbuf(mp, 1))
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return (EBUSY);
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#endif
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if (rootvp->v_usecount > 1)
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return (EBUSY);
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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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/*
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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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* Shutdown the socket. This will cause the select in the
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* daemon to wake up, and then the accept will get ECONNABORTED
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* which it interprets as a request to go and bury itself.
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*/
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soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2);
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/*
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* Discard reference to underlying file. Must call closef because
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* this may be the last reference.
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*/
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closef(VFSTOPORTAL(mp)->pm_server, (struct proc *) 0);
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/*
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* Finally, throw away the portalmount structure
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*/
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free(mp->mnt_data, M_UFSMNT); /* XXX */
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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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portal_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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/*
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* Return locked reference to root.
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*/
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vp = VFSTOPORTAL(mp)->pm_root;
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VREF(vp);
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VOP_LOCK(vp);
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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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portal_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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portal_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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sbp->f_type = MOUNT_PORTAL;
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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 = 1; /* Allow for "." */
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sbp->f_ffree = 0; /* See comments above */
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if (sbp != &mp->mnt_stat) {
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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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int
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portal_sync(mp, waitfor)
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struct mount *mp;
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int waitfor;
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{
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return (0);
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}
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int
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portal_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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int
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portal_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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int
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portal_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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struct vfsops portal_vfsops = {
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portal_mount,
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portal_start,
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portal_unmount,
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portal_root,
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portal_quotactl,
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portal_statfs,
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portal_sync,
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portal_vget,
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portal_fhtovp,
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portal_vptofh,
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portal_init,
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};
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VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, VFCF_SYNTHETIC);
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