356 lines
8.5 KiB
C
356 lines
8.5 KiB
C
/* $NetBSD: portal_vfsops.c,v 1.55 2006/05/14 21:31:53 elad 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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* from: Id: portal_vfsops.c,v 1.5 1992/05/30 10:25:27 jsp Exp
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* @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95
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*/
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/*
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* Portal Filesystem
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: portal_vfsops.c,v 1.55 2006/05/14 21:31:53 elad 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/sysctl.h>
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#include <sys/time.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/dirent.h>
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#include <sys/un.h>
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#include <sys/kauth.h>
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#include <miscfs/portal/portal.h>
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void portal_init(void);
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void portal_done(void);
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int portal_mount(struct mount *, const char *, void *,
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struct nameidata *, struct lwp *);
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int portal_start(struct mount *, int, struct lwp *);
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int portal_unmount(struct mount *, int, struct lwp *);
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int portal_root(struct mount *, struct vnode **);
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int portal_quotactl(struct mount *, int, uid_t, void *,
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struct lwp *);
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int portal_statvfs(struct mount *, struct statvfs *, struct lwp *);
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int portal_sync(struct mount *, int, kauth_cred_t, struct lwp *);
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int portal_vget(struct mount *, ino_t, struct vnode **);
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void
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portal_init()
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{
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}
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void
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portal_done()
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{
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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, l)
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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 lwp *l;
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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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struct proc *p;
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int error;
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p = l->l_proc;
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if (mp->mnt_flag & MNT_GETARGS) {
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fmp = VFSTOPORTAL(mp);
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if (fmp == NULL)
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return EIO;
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args.pa_config = NULL;
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args.pa_socket = 0; /* XXX */
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return copyout(&args, data, sizeof(args));
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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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error = copyin(data, &args, sizeof(struct portal_args));
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if (error)
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return (error);
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/* getsock() will use the descriptor for us */
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if ((error = getsock(p->p_fd, args.pa_socket, &fp)) != 0)
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return (error);
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so = (struct socket *) fp->f_data;
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FILE_UNUSE(fp, NULL);
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if (so->so_proto->pr_domain->dom_family != AF_LOCAL)
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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;
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simple_lock(&fp->f_slock);
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fp->f_count++;
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simple_unlock(&fp->f_slock);
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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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return set_statvfs_info(path, UIO_USERSPACE, args.pa_config,
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UIO_USERSPACE, mp, l);
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}
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int
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portal_start(mp, flags, l)
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struct mount *mp;
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int flags;
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struct lwp *l;
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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, l)
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struct mount *mp;
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int mntflags;
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struct lwp *l;
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{
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struct vnode *rtvp = VFSTOPORTAL(mp)->pm_root;
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int error, flags = 0;
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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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#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 (rtvp->v_usecount > 1)
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return (EBUSY);
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if ((error = vflush(mp, rtvp, flags)) != 0)
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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(rtvp);
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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(rtvp);
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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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simple_lock(&VFSTOPORTAL(mp)->pm_server->f_slock);
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FILE_USE(VFSTOPORTAL(mp)->pm_server);
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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 lwp *) 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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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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portal_quotactl(mp, cmd, uid, arg, l)
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struct mount *mp;
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int cmd;
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uid_t uid;
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void *arg;
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struct lwp *l;
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{
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return (EOPNOTSUPP);
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}
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int
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portal_statvfs(mp, sbp, l)
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struct mount *mp;
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struct statvfs *sbp;
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struct lwp *l;
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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 = 1; /* Allow for "." */
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sbp->f_ffree = 0; /* See comments above */
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sbp->f_favail = 0; /* See comments above */
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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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portal_sync(mp, waitfor, uc, l)
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struct mount *mp;
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int waitfor;
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kauth_cred_t uc;
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struct lwp *l;
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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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SYSCTL_SETUP(sysctl_vfs_portal_setup, "sysctl vfs.portal 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, "portal",
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SYSCTL_DESCR("Portal daemon file system"),
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NULL, 0, NULL, 0,
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CTL_VFS, 8, CTL_EOL);
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/*
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* XXX the "8" 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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* "8" 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 portal_vnodeop_opv_desc;
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const struct vnodeopv_desc * const portal_vnodeopv_descs[] = {
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&portal_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops portal_vfsops = {
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MOUNT_PORTAL,
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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_statvfs,
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portal_sync,
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portal_vget,
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NULL, /* vfs_fhtovp */
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NULL, /* vfs_vptofh */
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portal_init,
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NULL,
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portal_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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portal_vnodeopv_descs,
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};
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VFS_ATTACH(portal_vfsops);
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