portal_vfsops.c revision 73286
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 73286 2001-03-01 21:00:17Z adrian $ 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 MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure"); 61 62static int portal_mount __P((struct mount *mp, char *path, caddr_t data, 63 struct nameidata *ndp, 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 70/* 71 * Mount the per-process file descriptors (/dev/fd) 72 */ 73static int 74portal_mount(mp, path, data, ndp, p) 75 struct mount *mp; 76 char *path; 77 caddr_t data; 78 struct nameidata *ndp; 79 struct proc *p; 80{ 81 struct file *fp; 82 struct portal_args args; 83 struct portalmount *fmp; 84 struct socket *so; 85 struct vnode *rvp; 86 struct portalnode *pn; 87 u_int size; 88 int error; 89 90 /* 91 * Update is a no-op 92 */ 93 if (mp->mnt_flag & MNT_UPDATE) 94 return (EOPNOTSUPP); 95 96 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)); 97 if (error) 98 return (error); 99 100 error = holdsock(p->p_fd, args.pa_socket, &fp); 101 if (error) 102 return (error); 103 so = (struct socket *) fp->f_data; 104 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 105 fdrop(fp, p); 106 return (ESOCKTNOSUPPORT); 107 } 108 109 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 110 M_TEMP, M_WAITOK); 111 112 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 113 M_PORTALFSMNT, M_WAITOK); /* XXX */ 114 115 error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */ 116 if (error) { 117 FREE(fmp, M_PORTALFSMNT); 118 FREE(pn, M_TEMP); 119 fdrop(fp, p); 120 return (error); 121 } 122 123 rvp->v_data = pn; 124 rvp->v_type = VDIR; 125 rvp->v_flag |= VROOT; 126 VTOPORTAL(rvp)->pt_arg = 0; 127 VTOPORTAL(rvp)->pt_size = 0; 128 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 129 fmp->pm_root = rvp; 130 fmp->pm_server = fp; fp->f_count++; 131 132 mp->mnt_flag |= MNT_LOCAL; 133 mp->mnt_data = (qaddr_t) fmp; 134 vfs_getnewfsid(mp); 135 136 (void)copyinstr(args.pa_config, 137 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 138 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 139 140#ifdef notdef 141 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 142 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 143#endif 144 145 (void)portal_statfs(mp, &mp->mnt_stat, p); 146 fdrop(fp, p); 147 return (0); 148} 149 150static int 151portal_unmount(mp, mntflags, p) 152 struct mount *mp; 153 int mntflags; 154 struct proc *p; 155{ 156 struct vnode *rootvp = VFSTOPORTAL(mp)->pm_root; 157 int error, flags = 0; 158 159 160 if (mntflags & MNT_FORCE) 161 flags |= FORCECLOSE; 162 163 /* 164 * Clear out buffer cache. I don't think we 165 * ever get anything cached at this level at the 166 * moment, but who knows... 167 */ 168#ifdef notyet 169 mntflushbuf(mp, 0); 170 if (mntinvalbuf(mp, 1)) 171 return (EBUSY); 172#endif 173 if (rootvp->v_usecount > 1) 174 return (EBUSY); 175 error = vflush(mp, rootvp, flags); 176 if (error) 177 return (error); 178 179 /* 180 * Release reference on underlying root vnode 181 */ 182 vrele(rootvp); 183 /* 184 * And blow it away for future re-use 185 */ 186 vgone(rootvp); 187 /* 188 * Shutdown the socket. This will cause the select in the 189 * daemon to wake up, and then the accept will get ECONNABORTED 190 * which it interprets as a request to go and bury itself. 191 */ 192 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2); 193 /* 194 * Discard reference to underlying file. Must call closef because 195 * this may be the last reference. 196 */ 197 closef(VFSTOPORTAL(mp)->pm_server, (struct proc *) 0); 198 /* 199 * Finally, throw away the portalmount structure 200 */ 201 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ 202 mp->mnt_data = 0; 203 return (0); 204} 205 206static int 207portal_root(mp, vpp) 208 struct mount *mp; 209 struct vnode **vpp; 210{ 211 struct proc *p = curproc; /* XXX */ 212 struct vnode *vp; 213 214 /* 215 * Return locked reference to root. 216 */ 217 vp = VFSTOPORTAL(mp)->pm_root; 218 VREF(vp); 219 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 220 *vpp = vp; 221 return (0); 222} 223 224static int 225portal_statfs(mp, sbp, p) 226 struct mount *mp; 227 struct statfs *sbp; 228 struct proc *p; 229{ 230 231 sbp->f_flags = 0; 232 sbp->f_bsize = DEV_BSIZE; 233 sbp->f_iosize = DEV_BSIZE; 234 sbp->f_blocks = 2; /* 1K to keep df happy */ 235 sbp->f_bfree = 0; 236 sbp->f_bavail = 0; 237 sbp->f_files = 1; /* Allow for "." */ 238 sbp->f_ffree = 0; /* See comments above */ 239 if (sbp != &mp->mnt_stat) { 240 sbp->f_type = mp->mnt_vfc->vfc_typenum; 241 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 242 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 243 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 244 } 245 return (0); 246} 247 248static struct vfsops portal_vfsops = { 249 portal_mount, 250 vfs_stdstart, 251 portal_unmount, 252 portal_root, 253 vfs_stdquotactl, 254 portal_statfs, 255 vfs_stdsync, 256 vfs_stdvget, 257 vfs_stdfhtovp, 258 vfs_stdcheckexp, 259 vfs_stdvptofh, 260 vfs_stdinit, 261 vfs_stduninit, 262 vfs_stdextattrctl, 263}; 264 265VFS_SET(portal_vfsops, portal, VFCF_SYNTHETIC); 266