portal_vfsops.c revision 3034
1/* 2 * Copyright (c) 1992, 1993 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 8.6 (Berkeley) 1/21/94 37 * 38 * $Id: portal_vfsops.c,v 1.3 1994/09/22 19:38:17 wollman 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/time.h> 49#include <sys/types.h> 50#include <sys/proc.h> 51#include <sys/filedesc.h> 52#include <sys/file.h> 53#include <sys/vnode.h> 54#include <sys/mount.h> 55#include <sys/namei.h> 56#include <sys/malloc.h> 57#include <sys/mbuf.h> 58#include <sys/socket.h> 59#include <sys/socketvar.h> 60#include <sys/protosw.h> 61#include <sys/domain.h> 62#include <sys/un.h> 63#include <miscfs/portal/portal.h> 64 65int 66portal_init() 67{ 68 69 return (0); 70} 71 72/* 73 * Mount the per-process file descriptors (/dev/fd) 74 */ 75int 76portal_mount(mp, path, data, ndp, p) 77 struct mount *mp; 78 char *path; 79 caddr_t data; 80 struct nameidata *ndp; 81 struct proc *p; 82{ 83 struct file *fp; 84 struct portal_args args; 85 struct portalmount *fmp; 86 struct socket *so; 87 struct vnode *rvp; 88 u_int size; 89 int error; 90 91 /* 92 * Update is a no-op 93 */ 94 if (mp->mnt_flag & MNT_UPDATE) 95 return (EOPNOTSUPP); 96 97 if (error = copyin(data, (caddr_t) &args, sizeof(struct portal_args))) 98 return (error); 99 100 if (error = getsock(p->p_fd, args.pa_socket, &fp)) 101 return (error); 102 so = (struct socket *) fp->f_data; 103 if (so->so_proto->pr_domain->dom_family != AF_UNIX) 104 return (ESOCKTNOSUPPORT); 105 106 error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */ 107 if (error) 108 return (error); 109 MALLOC(rvp->v_data, void *, sizeof(struct portalnode), 110 M_TEMP, M_WAITOK); 111 112 fmp = (struct portalmount *) malloc(sizeof(struct portalmount), 113 M_UFSMNT, M_WAITOK); /* XXX */ 114 rvp->v_type = VDIR; 115 rvp->v_flag |= VROOT; 116 VTOPORTAL(rvp)->pt_arg = 0; 117 VTOPORTAL(rvp)->pt_size = 0; 118 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 119 fmp->pm_root = rvp; 120 fmp->pm_server = fp; fp->f_count++; 121 122 mp->mnt_flag |= MNT_LOCAL; 123 mp->mnt_data = (qaddr_t) fmp; 124 getnewfsid(mp, MOUNT_PORTAL); 125 126 (void)copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 127 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 128 (void)copyinstr(args.pa_config, 129 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 130 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 131 132#ifdef notdef 133 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 134 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 135#endif 136 137 return (0); 138} 139 140int 141portal_start(mp, flags, p) 142 struct mount *mp; 143 int flags; 144 struct proc *p; 145{ 146 147 return (0); 148} 149 150int 151portal_unmount(mp, mntflags, p) 152 struct mount *mp; 153 int mntflags; 154 struct proc *p; 155{ 156 extern int doforce; 157 struct vnode *rootvp = VFSTOPORTAL(mp)->pm_root; 158 int error, flags = 0; 159 160 161 if (mntflags & MNT_FORCE) { 162 /* portal can never be rootfs so don't check for it */ 163 if (!doforce) 164 return (EINVAL); 165 flags |= FORCECLOSE; 166 } 167 168 /* 169 * Clear out buffer cache. I don't think we 170 * ever get anything cached at this level at the 171 * moment, but who knows... 172 */ 173#ifdef notyet 174 mntflushbuf(mp, 0); 175 if (mntinvalbuf(mp, 1)) 176 return (EBUSY); 177#endif 178 if (rootvp->v_usecount > 1) 179 return (EBUSY); 180 if (error = vflush(mp, rootvp, flags)) 181 return (error); 182 183 /* 184 * Release reference on underlying root vnode 185 */ 186 vrele(rootvp); 187 /* 188 * And blow it away for future re-use 189 */ 190 vgone(rootvp); 191 /* 192 * Shutdown the socket. This will cause the select in the 193 * daemon to wake up, and then the accept will get ECONNABORTED 194 * which it interprets as a request to go and bury itself. 195 */ 196 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2); 197 /* 198 * Discard reference to underlying file. Must call closef because 199 * this may be the last reference. 200 */ 201 closef(VFSTOPORTAL(mp)->pm_server, (struct proc *) 0); 202 /* 203 * Finally, throw away the portalmount structure 204 */ 205 free(mp->mnt_data, M_UFSMNT); /* XXX */ 206 mp->mnt_data = 0; 207 return (0); 208} 209 210int 211portal_root(mp, vpp) 212 struct mount *mp; 213 struct vnode **vpp; 214{ 215 struct vnode *vp; 216 217 218 /* 219 * Return locked reference to root. 220 */ 221 vp = VFSTOPORTAL(mp)->pm_root; 222 VREF(vp); 223 VOP_LOCK(vp); 224 *vpp = vp; 225 return (0); 226} 227 228int 229portal_quotactl(mp, cmd, uid, arg, p) 230 struct mount *mp; 231 int cmd; 232 uid_t uid; 233 caddr_t arg; 234 struct proc *p; 235{ 236 237 return (EOPNOTSUPP); 238} 239 240int 241portal_statfs(mp, sbp, p) 242 struct mount *mp; 243 struct statfs *sbp; 244 struct proc *p; 245{ 246 247 sbp->f_type = MOUNT_PORTAL; 248 sbp->f_flags = 0; 249 sbp->f_bsize = DEV_BSIZE; 250 sbp->f_iosize = DEV_BSIZE; 251 sbp->f_blocks = 2; /* 1K to keep df happy */ 252 sbp->f_bfree = 0; 253 sbp->f_bavail = 0; 254 sbp->f_files = 1; /* Allow for "." */ 255 sbp->f_ffree = 0; /* See comments above */ 256 if (sbp != &mp->mnt_stat) { 257 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 258 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 259 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 260 } 261 return (0); 262} 263 264int 265portal_sync(mp, waitfor) 266 struct mount *mp; 267 int waitfor; 268{ 269 270 return (0); 271} 272 273int 274portal_vget(mp, ino, vpp) 275 struct mount *mp; 276 ino_t ino; 277 struct vnode **vpp; 278{ 279 280 return (EOPNOTSUPP); 281} 282 283int 284portal_fhtovp(mp, fhp, vpp) 285 struct mount *mp; 286 struct fid *fhp; 287 struct vnode **vpp; 288{ 289 290 return (EOPNOTSUPP); 291} 292 293int 294portal_vptofh(vp, fhp) 295 struct vnode *vp; 296 struct fid *fhp; 297{ 298 299 return (EOPNOTSUPP); 300} 301 302struct vfsops portal_vfsops = { 303 portal_mount, 304 portal_start, 305 portal_unmount, 306 portal_root, 307 portal_quotactl, 308 portal_statfs, 309 portal_sync, 310 portal_vget, 311 portal_fhtovp, 312 portal_vptofh, 313 portal_init, 314}; 315 316VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, 0); 317