portal_vfsops.c revision 22579
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 * $FreeBSD: head/sys/fs/portalfs/portal_vfsops.c 22579 1997-02-12 06:52:51Z mpp $ 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 65static int portal_init __P((struct vfsconf *)); 66static int portal_mount __P((struct mount *mp, char *path, caddr_t data, 67 struct nameidata *ndp, struct proc *p)); 68static int portal_start __P((struct mount *mp, int flags, struct proc *p)); 69static int portal_unmount __P((struct mount *mp, int mntflags, 70 struct proc *p)); 71static int portal_root __P((struct mount *mp, struct vnode **vpp)); 72static int portal_statfs __P((struct mount *mp, struct statfs *sbp, 73 struct proc *p)); 74 75static int 76portal_init(vfsp) 77 struct vfsconf *vfsp; 78{ 79 80 return (0); 81} 82 83/* 84 * Mount the per-process file descriptors (/dev/fd) 85 */ 86static int 87portal_mount(mp, path, data, ndp, p) 88 struct mount *mp; 89 char *path; 90 caddr_t data; 91 struct nameidata *ndp; 92 struct proc *p; 93{ 94 struct file *fp; 95 struct portal_args args; 96 struct portalmount *fmp; 97 struct socket *so; 98 struct vnode *rvp; 99 struct portalnode *pn; 100 u_int size; 101 int error; 102 103 /* 104 * Update is a no-op 105 */ 106 if (mp->mnt_flag & MNT_UPDATE) 107 return (EOPNOTSUPP); 108 109 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)); 110 if (error) 111 return (error); 112 113 error = getsock(p->p_fd, args.pa_socket, &fp); 114 if (error) 115 return (error); 116 so = (struct socket *) fp->f_data; 117 if (so->so_proto->pr_domain->dom_family != AF_UNIX) 118 return (ESOCKTNOSUPPORT); 119 120 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 121 M_TEMP, M_WAITOK); 122 123 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 124 M_UFSMNT, M_WAITOK); /* XXX */ 125 126 error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */ 127 if (error) { 128 FREE(fmp, M_UFSMNT); 129 FREE(pn, M_TEMP); 130 return (error); 131 } 132 133 rvp->v_data = pn; 134 rvp->v_type = VDIR; 135 rvp->v_flag |= VROOT; 136 VTOPORTAL(rvp)->pt_arg = 0; 137 VTOPORTAL(rvp)->pt_size = 0; 138 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 139 fmp->pm_root = rvp; 140 fmp->pm_server = fp; fp->f_count++; 141 142 mp->mnt_flag |= MNT_LOCAL; 143 mp->mnt_data = (qaddr_t) fmp; 144 vfs_getnewfsid(mp); 145 146 (void)copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 147 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 148 (void)copyinstr(args.pa_config, 149 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 150 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 151 152#ifdef notdef 153 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 154 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 155#endif 156 157 return (0); 158} 159 160static int 161portal_start(mp, flags, p) 162 struct mount *mp; 163 int flags; 164 struct proc *p; 165{ 166 167 return (0); 168} 169 170static int 171portal_unmount(mp, mntflags, p) 172 struct mount *mp; 173 int mntflags; 174 struct proc *p; 175{ 176 struct vnode *rootvp = VFSTOPORTAL(mp)->pm_root; 177 int error, flags = 0; 178 179 180 if (mntflags & MNT_FORCE) 181 flags |= FORCECLOSE; 182 183 /* 184 * Clear out buffer cache. I don't think we 185 * ever get anything cached at this level at the 186 * moment, but who knows... 187 */ 188#ifdef notyet 189 mntflushbuf(mp, 0); 190 if (mntinvalbuf(mp, 1)) 191 return (EBUSY); 192#endif 193 if (rootvp->v_usecount > 1) 194 return (EBUSY); 195 error = vflush(mp, rootvp, flags); 196 if (error) 197 return (error); 198 199 /* 200 * Release reference on underlying root vnode 201 */ 202 vrele(rootvp); 203 /* 204 * And blow it away for future re-use 205 */ 206 vgone(rootvp); 207 /* 208 * Shutdown the socket. This will cause the select in the 209 * daemon to wake up, and then the accept will get ECONNABORTED 210 * which it interprets as a request to go and bury itself. 211 */ 212 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2); 213 /* 214 * Discard reference to underlying file. Must call closef because 215 * this may be the last reference. 216 */ 217 closef(VFSTOPORTAL(mp)->pm_server, (struct proc *) 0); 218 /* 219 * Finally, throw away the portalmount structure 220 */ 221 free(mp->mnt_data, M_UFSMNT); /* XXX */ 222 mp->mnt_data = 0; 223 return (0); 224} 225 226static int 227portal_root(mp, vpp) 228 struct mount *mp; 229 struct vnode **vpp; 230{ 231 struct proc *p = curproc; /* XXX */ 232 struct vnode *vp; 233 234 /* 235 * Return locked reference to root. 236 */ 237 vp = VFSTOPORTAL(mp)->pm_root; 238 VREF(vp); 239 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 240 *vpp = vp; 241 return (0); 242} 243 244static int 245portal_statfs(mp, sbp, p) 246 struct mount *mp; 247 struct statfs *sbp; 248 struct proc *p; 249{ 250 251 sbp->f_flags = 0; 252 sbp->f_bsize = DEV_BSIZE; 253 sbp->f_iosize = DEV_BSIZE; 254 sbp->f_blocks = 2; /* 1K to keep df happy */ 255 sbp->f_bfree = 0; 256 sbp->f_bavail = 0; 257 sbp->f_files = 1; /* Allow for "." */ 258 sbp->f_ffree = 0; /* See comments above */ 259 if (sbp != &mp->mnt_stat) { 260 sbp->f_type = mp->mnt_vfc->vfc_typenum; 261 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 262 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 263 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 264 } 265 return (0); 266} 267 268#define portal_fhtovp ((int (*) __P((struct mount *, struct fid *, \ 269 struct mbuf *, struct vnode **, int *, struct ucred **)))eopnotsupp) 270#define portal_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \ 271 struct proc *)))eopnotsupp) 272#define portal_sync ((int (*) __P((struct mount *, int, struct ucred *, \ 273 struct proc *)))nullop) 274#define portal_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \ 275 size_t, struct proc *)))eopnotsupp) 276#define portal_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \ 277 eopnotsupp) 278#define portal_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp) 279 280static struct vfsops portal_vfsops = { 281 portal_mount, 282 portal_start, 283 portal_unmount, 284 portal_root, 285 portal_quotactl, 286 portal_statfs, 287 portal_sync, 288 portal_vget, 289 portal_fhtovp, 290 portal_vptofh, 291 portal_init, 292}; 293 294VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, VFCF_SYNTHETIC); 295