portal_vfsops.c revision 28270
1/* 2 * Copyright (c) 1992, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software donated to Berkeley by 6 * Jan-Simon Pendry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95 37 * 38 * $Id: portal_vfsops.c,v 1.16 1997/08/02 14:32:07 bde Exp $ 39 */ 40 41/* 42 * Portal Filesystem 43 */ 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/kernel.h> 48#include <sys/proc.h> 49#include <sys/filedesc.h> 50#include <sys/file.h> 51#include <sys/vnode.h> 52#include <sys/mount.h> 53#include <sys/malloc.h> 54#include <sys/socket.h> 55#include <sys/socketvar.h> 56#include <sys/protosw.h> 57#include <sys/domain.h> 58#include <miscfs/portal/portal.h> 59 60static int portal_init __P((struct vfsconf *)); 61static int portal_mount __P((struct mount *mp, char *path, caddr_t data, 62 struct nameidata *ndp, struct proc *p)); 63static int portal_start __P((struct mount *mp, int flags, struct proc *p)); 64static int portal_unmount __P((struct mount *mp, int mntflags, 65 struct proc *p)); 66static int portal_root __P((struct mount *mp, struct vnode **vpp)); 67static int portal_statfs __P((struct mount *mp, struct statfs *sbp, 68 struct proc *p)); 69 70static int 71portal_init(vfsp) 72 struct vfsconf *vfsp; 73{ 74 75 return (0); 76} 77 78/* 79 * Mount the per-process file descriptors (/dev/fd) 80 */ 81static int 82portal_mount(mp, path, data, ndp, p) 83 struct mount *mp; 84 char *path; 85 caddr_t data; 86 struct nameidata *ndp; 87 struct proc *p; 88{ 89 struct file *fp; 90 struct portal_args args; 91 struct portalmount *fmp; 92 struct socket *so; 93 struct vnode *rvp; 94 struct portalnode *pn; 95 u_int size; 96 int error; 97 98 /* 99 * Update is a no-op 100 */ 101 if (mp->mnt_flag & MNT_UPDATE) 102 return (EOPNOTSUPP); 103 104 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)); 105 if (error) 106 return (error); 107 108 error = getsock(p->p_fd, args.pa_socket, &fp); 109 if (error) 110 return (error); 111 so = (struct socket *) fp->f_data; 112 if (so->so_proto->pr_domain->dom_family != AF_UNIX) 113 return (ESOCKTNOSUPPORT); 114 115 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 116 M_TEMP, M_WAITOK); 117 118 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 119 M_UFSMNT, M_WAITOK); /* XXX */ 120 121 error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */ 122 if (error) { 123 FREE(fmp, M_UFSMNT); 124 FREE(pn, M_TEMP); 125 return (error); 126 } 127 128 rvp->v_data = pn; 129 rvp->v_type = VDIR; 130 rvp->v_flag |= VROOT; 131 VTOPORTAL(rvp)->pt_arg = 0; 132 VTOPORTAL(rvp)->pt_size = 0; 133 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 134 fmp->pm_root = rvp; 135 fmp->pm_server = fp; fp->f_count++; 136 137 mp->mnt_flag |= MNT_LOCAL; 138 mp->mnt_data = (qaddr_t) fmp; 139 vfs_getnewfsid(mp); 140 141 (void)copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 142 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 143 (void)copyinstr(args.pa_config, 144 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 145 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 146 147#ifdef notdef 148 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 149 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 150#endif 151 152 return (0); 153} 154 155static int 156portal_start(mp, flags, p) 157 struct mount *mp; 158 int flags; 159 struct proc *p; 160{ 161 162 return (0); 163} 164 165static int 166portal_unmount(mp, mntflags, p) 167 struct mount *mp; 168 int mntflags; 169 struct proc *p; 170{ 171 struct vnode *rootvp = VFSTOPORTAL(mp)->pm_root; 172 int error, flags = 0; 173 174 175 if (mntflags & MNT_FORCE) 176 flags |= FORCECLOSE; 177 178 /* 179 * Clear out buffer cache. I don't think we 180 * ever get anything cached at this level at the 181 * moment, but who knows... 182 */ 183#ifdef notyet 184 mntflushbuf(mp, 0); 185 if (mntinvalbuf(mp, 1)) 186 return (EBUSY); 187#endif 188 if (rootvp->v_usecount > 1) 189 return (EBUSY); 190 error = vflush(mp, rootvp, flags); 191 if (error) 192 return (error); 193 194 /* 195 * Release reference on underlying root vnode 196 */ 197 vrele(rootvp); 198 /* 199 * And blow it away for future re-use 200 */ 201 vgone(rootvp); 202 /* 203 * Shutdown the socket. This will cause the select in the 204 * daemon to wake up, and then the accept will get ECONNABORTED 205 * which it interprets as a request to go and bury itself. 206 */ 207 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2); 208 /* 209 * Discard reference to underlying file. Must call closef because 210 * this may be the last reference. 211 */ 212 closef(VFSTOPORTAL(mp)->pm_server, (struct proc *) 0); 213 /* 214 * Finally, throw away the portalmount structure 215 */ 216 free(mp->mnt_data, M_UFSMNT); /* XXX */ 217 mp->mnt_data = 0; 218 return (0); 219} 220 221static int 222portal_root(mp, vpp) 223 struct mount *mp; 224 struct vnode **vpp; 225{ 226 struct proc *p = curproc; /* XXX */ 227 struct vnode *vp; 228 229 /* 230 * Return locked reference to root. 231 */ 232 vp = VFSTOPORTAL(mp)->pm_root; 233 VREF(vp); 234 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 235 *vpp = vp; 236 return (0); 237} 238 239static int 240portal_statfs(mp, sbp, p) 241 struct mount *mp; 242 struct statfs *sbp; 243 struct proc *p; 244{ 245 246 sbp->f_flags = 0; 247 sbp->f_bsize = DEV_BSIZE; 248 sbp->f_iosize = DEV_BSIZE; 249 sbp->f_blocks = 2; /* 1K to keep df happy */ 250 sbp->f_bfree = 0; 251 sbp->f_bavail = 0; 252 sbp->f_files = 1; /* Allow for "." */ 253 sbp->f_ffree = 0; /* See comments above */ 254 if (sbp != &mp->mnt_stat) { 255 sbp->f_type = mp->mnt_vfc->vfc_typenum; 256 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 257 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 258 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 259 } 260 return (0); 261} 262 263#define portal_fhtovp ((int (*) __P((struct mount *, struct fid *, \ 264 struct sockaddr *, struct vnode **, int *, struct ucred **)))eopnotsupp) 265#define portal_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \ 266 struct proc *)))eopnotsupp) 267#define portal_sync ((int (*) __P((struct mount *, int, struct ucred *, \ 268 struct proc *)))nullop) 269#define portal_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \ 270 size_t, struct proc *)))eopnotsupp) 271#define portal_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \ 272 eopnotsupp) 273#define portal_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp) 274 275static struct vfsops portal_vfsops = { 276 portal_mount, 277 portal_start, 278 portal_unmount, 279 portal_root, 280 portal_quotactl, 281 portal_statfs, 282 portal_sync, 283 portal_vget, 284 portal_fhtovp, 285 portal_vptofh, 286 portal_init, 287}; 288 289VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, VFCF_SYNTHETIC); 290