portal_vfsops.c revision 7095
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 1.6 1995/03/16 18:13:38 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/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 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)); 98 if (error) 99 return (error); 100 101 error = getsock(p->p_fd, args.pa_socket, &fp); 102 if (error) 103 return (error); 104 so = (struct socket *) fp->f_data; 105 if (so->so_proto->pr_domain->dom_family != AF_UNIX) 106 return (ESOCKTNOSUPPORT); 107 108 error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */ 109 if (error) 110 return (error); 111 MALLOC(rvp->v_data, void *, sizeof(struct portalnode), 112 M_TEMP, M_WAITOK); 113 114 fmp = (struct portalmount *) malloc(sizeof(struct portalmount), 115 M_UFSMNT, M_WAITOK); /* XXX */ 116 rvp->v_type = VDIR; 117 rvp->v_flag |= VROOT; 118 VTOPORTAL(rvp)->pt_arg = 0; 119 VTOPORTAL(rvp)->pt_size = 0; 120 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 121 fmp->pm_root = rvp; 122 fmp->pm_server = fp; fp->f_count++; 123 124 mp->mnt_flag |= MNT_LOCAL; 125 mp->mnt_data = (qaddr_t) fmp; 126 getnewfsid(mp, MOUNT_PORTAL); 127 128 (void)copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 129 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 130 (void)copyinstr(args.pa_config, 131 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 132 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 133 134#ifdef notdef 135 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 136 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 137#endif 138 139 return (0); 140} 141 142int 143portal_start(mp, flags, p) 144 struct mount *mp; 145 int flags; 146 struct proc *p; 147{ 148 149 return (0); 150} 151 152int 153portal_unmount(mp, mntflags, p) 154 struct mount *mp; 155 int mntflags; 156 struct proc *p; 157{ 158 struct vnode *rootvp = VFSTOPORTAL(mp)->pm_root; 159 int error, flags = 0; 160 161 162 if (mntflags & MNT_FORCE) { 163 /* portal can never be rootfs so don't check for it */ 164 if (!doforce) 165 return (EINVAL); 166 flags |= FORCECLOSE; 167 } 168 169 /* 170 * Clear out buffer cache. I don't think we 171 * ever get anything cached at this level at the 172 * moment, but who knows... 173 */ 174#ifdef notyet 175 mntflushbuf(mp, 0); 176 if (mntinvalbuf(mp, 1)) 177 return (EBUSY); 178#endif 179 if (rootvp->v_usecount > 1) 180 return (EBUSY); 181 error = vflush(mp, rootvp, flags); 182 if (error) 183 return (error); 184 185 /* 186 * Release reference on underlying root vnode 187 */ 188 vrele(rootvp); 189 /* 190 * And blow it away for future re-use 191 */ 192 vgone(rootvp); 193 /* 194 * Shutdown the socket. This will cause the select in the 195 * daemon to wake up, and then the accept will get ECONNABORTED 196 * which it interprets as a request to go and bury itself. 197 */ 198 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2); 199 /* 200 * Discard reference to underlying file. Must call closef because 201 * this may be the last reference. 202 */ 203 closef(VFSTOPORTAL(mp)->pm_server, (struct proc *) 0); 204 /* 205 * Finally, throw away the portalmount structure 206 */ 207 free(mp->mnt_data, M_UFSMNT); /* XXX */ 208 mp->mnt_data = 0; 209 return (0); 210} 211 212int 213portal_root(mp, vpp) 214 struct mount *mp; 215 struct vnode **vpp; 216{ 217 struct vnode *vp; 218 219 220 /* 221 * Return locked reference to root. 222 */ 223 vp = VFSTOPORTAL(mp)->pm_root; 224 VREF(vp); 225 VOP_LOCK(vp); 226 *vpp = vp; 227 return (0); 228} 229 230int 231portal_quotactl(mp, cmd, uid, arg, p) 232 struct mount *mp; 233 int cmd; 234 uid_t uid; 235 caddr_t arg; 236 struct proc *p; 237{ 238 239 return (EOPNOTSUPP); 240} 241 242int 243portal_statfs(mp, sbp, p) 244 struct mount *mp; 245 struct statfs *sbp; 246 struct proc *p; 247{ 248 249 sbp->f_type = MOUNT_PORTAL; 250 sbp->f_flags = 0; 251 sbp->f_bsize = DEV_BSIZE; 252 sbp->f_iosize = DEV_BSIZE; 253 sbp->f_blocks = 2; /* 1K to keep df happy */ 254 sbp->f_bfree = 0; 255 sbp->f_bavail = 0; 256 sbp->f_files = 1; /* Allow for "." */ 257 sbp->f_ffree = 0; /* See comments above */ 258 if (sbp != &mp->mnt_stat) { 259 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 260 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 261 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 262 } 263 return (0); 264} 265 266int 267portal_sync(mp, waitfor) 268 struct mount *mp; 269 int waitfor; 270{ 271 272 return (0); 273} 274 275int 276portal_vget(mp, ino, vpp) 277 struct mount *mp; 278 ino_t ino; 279 struct vnode **vpp; 280{ 281 282 return (EOPNOTSUPP); 283} 284 285int 286portal_fhtovp(mp, fhp, vpp) 287 struct mount *mp; 288 struct fid *fhp; 289 struct vnode **vpp; 290{ 291 292 return (EOPNOTSUPP); 293} 294 295int 296portal_vptofh(vp, fhp) 297 struct vnode *vp; 298 struct fid *fhp; 299{ 300 301 return (EOPNOTSUPP); 302} 303 304struct vfsops portal_vfsops = { 305 portal_mount, 306 portal_start, 307 portal_unmount, 308 portal_root, 309 portal_quotactl, 310 portal_statfs, 311 portal_sync, 312 portal_vget, 313 portal_fhtovp, 314 portal_vptofh, 315 portal_init, 316}; 317 318VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, VFCF_SYNTHETIC); 319