portal_vfsops.c revision 109153
136285Sbrian/* 236285Sbrian * Copyright (c) 1992, 1993, 1995 336285Sbrian * The Regents of the University of California. All rights reserved. 413389Sphk * 536285Sbrian * This code is derived from software donated to Berkeley by 636285Sbrian * Jan-Simon Pendry. 736285Sbrian * 836285Sbrian * Redistribution and use in source and binary forms, with or without 936285Sbrian * modification, are permitted provided that the following conditions 1036285Sbrian * are met: 1136285Sbrian * 1. Redistributions of source code must retain the above copyright 1236285Sbrian * notice, this list of conditions and the following disclaimer. 1313389Sphk * 2. Redistributions in binary form must reproduce the above copyright 1436285Sbrian * notice, this list of conditions and the following disclaimer in the 1536285Sbrian * documentation and/or other materials provided with the distribution. 1636285Sbrian * 3. All advertising materials mentioning features or use of this software 1736285Sbrian * must display the following acknowledgement: 1836285Sbrian * This product includes software developed by the University of 1936285Sbrian * California, Berkeley and its contributors. 2036285Sbrian * 4. Neither the name of the University nor the names of its contributors 2136285Sbrian * may be used to endorse or promote products derived from this software 2236285Sbrian * without specific prior written permission. 2336285Sbrian * 2436285Sbrian * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2513389Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2650479Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2713389Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2830715Sbrian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2936285Sbrian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3036285Sbrian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3136285Sbrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3236285Sbrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3336285Sbrian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3436285Sbrian * SUCH DAMAGE. 3536285Sbrian * 3636285Sbrian * @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95 3736285Sbrian * 3836285Sbrian * $FreeBSD: head/sys/fs/portalfs/portal_vfsops.c 109153 2003-01-13 00:33:17Z dillon $ 3958028Sbrian */ 4036285Sbrian 4136285Sbrian/* 4236285Sbrian * Portal Filesystem 4336285Sbrian */ 4436285Sbrian 4536285Sbrian#include <sys/param.h> 4636285Sbrian#include <sys/systm.h> 4736285Sbrian#include <sys/domain.h> 4836285Sbrian#include <sys/filedesc.h> 4936285Sbrian#include <sys/kernel.h> 5036285Sbrian#include <sys/lock.h> 5136285Sbrian#include <sys/mutex.h> 5236285Sbrian#include <sys/malloc.h> 5336285Sbrian#include <sys/file.h> /* Must come after sys/malloc.h */ 5436285Sbrian#include <sys/mount.h> 55228990Suqs#include <sys/proc.h> 56228990Suqs#include <sys/protosw.h> 5736285Sbrian#include <sys/socket.h> 5836285Sbrian#include <sys/socketvar.h> 5936285Sbrian#include <sys/vnode.h> 6036285Sbrian 6136285Sbrian#include <fs/portalfs/portal.h> 6236285Sbrian 6336285Sbrianstatic MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure"); 6436285Sbrian 6536285Sbrianstatic int portal_mount(struct mount *mp, char *path, caddr_t data, 6636285Sbrian struct nameidata *ndp, struct thread *td); 6736285Sbrianstatic int portal_unmount(struct mount *mp, int mntflags, 6836285Sbrian struct thread *td); 6936285Sbrianstatic int portal_root(struct mount *mp, struct vnode **vpp); 7036285Sbrianstatic int portal_statfs(struct mount *mp, struct statfs *sbp, 7136285Sbrian struct thread *td); 7236285Sbrian 7336285Sbrian/* 7436285Sbrian * Mount the per-process file descriptors (/dev/fd) 7536285Sbrian */ 7636285Sbrianstatic int 7730715Sbrianportal_mount(mp, path, data, ndp, td) 7830715Sbrian struct mount *mp; 7954055Sbrian char *path; 8054914Sbrian caddr_t data; 8154055Sbrian struct nameidata *ndp; 8236285Sbrian struct thread *td; 83{ 84 struct file *fp; 85 struct portal_args args; 86 struct portalmount *fmp; 87 struct socket *so; 88 struct vnode *rvp; 89 struct portalnode *pn; 90 size_t size; 91 int error; 92 93 /* 94 * Update is a no-op 95 */ 96 if (mp->mnt_flag & MNT_UPDATE) 97 return (EOPNOTSUPP); 98 99 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)); 100 if (error) 101 return (error); 102 103 if ((error = fget(td, args.pa_socket, &fp)) != 0) 104 return (error); 105 if (fp->f_type != DTYPE_SOCKET) { 106 fdrop(fp, td); 107 return(ENOTSOCK); 108 } 109 so = fp->f_data; /* XXX race against userland */ 110 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 111 fdrop(fp, td); 112 return (ESOCKTNOSUPPORT); 113 } 114 115 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 116 M_TEMP, M_WAITOK); 117 118 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 119 M_PORTALFSMNT, M_WAITOK); /* XXX */ 120 121 error = getnewvnode("portal", mp, portal_vnodeop_p, &rvp); /* XXX */ 122 if (error) { 123 FREE(fmp, M_PORTALFSMNT); 124 FREE(pn, M_TEMP); 125 fdrop(fp, td); 126 return (error); 127 } 128 129 rvp->v_data = pn; 130 rvp->v_type = VDIR; 131 rvp->v_vflag |= VV_ROOT; 132 VTOPORTAL(rvp)->pt_arg = 0; 133 VTOPORTAL(rvp)->pt_size = 0; 134 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 135 fmp->pm_root = rvp; 136 fhold(fp); 137 fmp->pm_server = fp; 138 139 mp->mnt_flag |= MNT_LOCAL; 140 mp->mnt_data = (qaddr_t) fmp; 141 vfs_getnewfsid(mp); 142 143 (void)copyinstr(args.pa_config, 144 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 145 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 146 147#ifdef notdef 148 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 149 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 150#endif 151 152 (void)portal_statfs(mp, &mp->mnt_stat, td); 153 fdrop(fp, td); 154 return (0); 155} 156 157static int 158portal_unmount(mp, mntflags, td) 159 struct mount *mp; 160 int mntflags; 161 struct thread *td; 162{ 163 int error, flags = 0; 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(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