portal_vfsops.c revision 89306
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 89306 2002-01-13 11:58:06Z alfred $ 39 */ 40 41/* 42 * Portal Filesystem 43 */ 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/domain.h> 48#include <sys/filedesc.h> 49#include <sys/kernel.h> 50#include <sys/lock.h> 51#include <sys/malloc.h> 52#include <sys/file.h> /* Must come after sys/malloc.h */ 53#include <sys/mount.h> 54#include <sys/proc.h> 55#include <sys/protosw.h> 56#include <sys/socket.h> 57#include <sys/socketvar.h> 58#include <sys/vnode.h> 59 60#include <fs/portalfs/portal.h> 61 62static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure"); 63 64static int portal_mount __P((struct mount *mp, char *path, caddr_t data, 65 struct nameidata *ndp, struct thread *td)); 66static int portal_unmount __P((struct mount *mp, int mntflags, 67 struct thread *td)); 68static int portal_root __P((struct mount *mp, struct vnode **vpp)); 69static int portal_statfs __P((struct mount *mp, struct statfs *sbp, 70 struct thread *td)); 71 72/* 73 * Mount the per-process file descriptors (/dev/fd) 74 */ 75static int 76portal_mount(mp, path, data, ndp, td) 77 struct mount *mp; 78 char *path; 79 caddr_t data; 80 struct nameidata *ndp; 81 struct thread *td; 82{ 83 struct file *fp; 84 struct portal_args args; 85 struct portalmount *fmp; 86 struct socket *so; 87 struct vnode *rvp; 88 struct portalnode *pn; 89 u_int size; 90 int error; 91 92 /* 93 * Update is a no-op 94 */ 95 if (mp->mnt_flag & MNT_UPDATE) 96 return (EOPNOTSUPP); 97 98 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)); 99 if (error) 100 return (error); 101 102 if ((error = fget(td, args.pa_socket, &fp)) != 0) 103 return (error); 104 if (fp->f_type != DTYPE_SOCKET) { 105 fdrop(fp, td); 106 return(ENOTSOCK); 107 } 108 so = (struct socket *) fp->f_data; /* XXX race against userland */ 109 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 110 fdrop(fp, td); 111 return (ESOCKTNOSUPPORT); 112 } 113 114 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 115 M_TEMP, M_WAITOK); 116 117 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 118 M_PORTALFSMNT, M_WAITOK); /* XXX */ 119 120 error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */ 121 if (error) { 122 FREE(fmp, M_PORTALFSMNT); 123 FREE(pn, M_TEMP); 124 fdrop(fp, td); 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 fhold(fp); 136 fmp->pm_server = fp; 137 138 mp->mnt_flag |= MNT_LOCAL; 139 mp->mnt_data = (qaddr_t) fmp; 140 vfs_getnewfsid(mp); 141 142 (void)copyinstr(args.pa_config, 143 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 144 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 145 146#ifdef notdef 147 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 148 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 149#endif 150 151 (void)portal_statfs(mp, &mp->mnt_stat, td); 152 fdrop(fp, td); 153 return (0); 154} 155 156static int 157portal_unmount(mp, mntflags, td) 158 struct mount *mp; 159 int mntflags; 160 struct thread *td; 161{ 162 int error, flags = 0; 163 struct socket *so; 164 165 166 if (mntflags & MNT_FORCE) 167 flags |= FORCECLOSE; 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 /* There is 1 extra root vnode reference (pm_root). */ 180 error = vflush(mp, 1, flags); 181 if (error) 182 return (error); 183 184 /* 185 * Shutdown the socket. This will cause the select in the 186 * daemon to wake up, and then the accept will get ECONNABORTED 187 * which it interprets as a request to go and bury itself. 188 */ 189 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2); 190 /* 191 * Discard reference to underlying file. Must call closef because 192 * this may be the last reference. 193 */ 194 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0); 195 /* 196 * Finally, throw away the portalmount structure 197 */ 198 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ 199 mp->mnt_data = 0; 200 return (0); 201} 202 203static int 204portal_root(mp, vpp) 205 struct mount *mp; 206 struct vnode **vpp; 207{ 208 struct thread *td = curthread; /* XXX */ 209 struct vnode *vp; 210 211 /* 212 * Return locked reference to root. 213 */ 214 vp = VFSTOPORTAL(mp)->pm_root; 215 VREF(vp); 216 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 217 *vpp = vp; 218 return (0); 219} 220 221static int 222portal_statfs(mp, sbp, td) 223 struct mount *mp; 224 struct statfs *sbp; 225 struct thread *td; 226{ 227 228 sbp->f_flags = 0; 229 sbp->f_bsize = DEV_BSIZE; 230 sbp->f_iosize = DEV_BSIZE; 231 sbp->f_blocks = 2; /* 1K to keep df happy */ 232 sbp->f_bfree = 0; 233 sbp->f_bavail = 0; 234 sbp->f_files = 1; /* Allow for "." */ 235 sbp->f_ffree = 0; /* See comments above */ 236 if (sbp != &mp->mnt_stat) { 237 sbp->f_type = mp->mnt_vfc->vfc_typenum; 238 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 239 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 240 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 241 } 242 return (0); 243} 244 245static struct vfsops portal_vfsops = { 246 portal_mount, 247 vfs_stdstart, 248 portal_unmount, 249 portal_root, 250 vfs_stdquotactl, 251 portal_statfs, 252 vfs_stdsync, 253 vfs_stdvget, 254 vfs_stdfhtovp, 255 vfs_stdcheckexp, 256 vfs_stdvptofh, 257 vfs_stdinit, 258 vfs_stduninit, 259 vfs_stdextattrctl, 260}; 261 262VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC); 263