portal_vfsops.c revision 83366
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 83366 2001-09-12 08:38:13Z julian $ 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 error = holdsock(td->td_proc->p_fd, args.pa_socket, &fp); 103 if (error) 104 return (error); 105 so = (struct socket *) fp->f_data; 106 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 107 fdrop(fp, td); 108 return (ESOCKTNOSUPPORT); 109 } 110 111 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 112 M_TEMP, M_WAITOK); 113 114 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 115 M_PORTALFSMNT, M_WAITOK); /* XXX */ 116 117 error = getnewvnode(VT_PORTAL, mp, portal_vnodeop_p, &rvp); /* XXX */ 118 if (error) { 119 FREE(fmp, M_PORTALFSMNT); 120 FREE(pn, M_TEMP); 121 fdrop(fp, td); 122 return (error); 123 } 124 125 rvp->v_data = pn; 126 rvp->v_type = VDIR; 127 rvp->v_flag |= VROOT; 128 VTOPORTAL(rvp)->pt_arg = 0; 129 VTOPORTAL(rvp)->pt_size = 0; 130 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 131 fmp->pm_root = rvp; 132 fmp->pm_server = fp; fp->f_count++; 133 134 mp->mnt_flag |= MNT_LOCAL; 135 mp->mnt_data = (qaddr_t) fmp; 136 vfs_getnewfsid(mp); 137 138 (void)copyinstr(args.pa_config, 139 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 140 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 141 142#ifdef notdef 143 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 144 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 145#endif 146 147 (void)portal_statfs(mp, &mp->mnt_stat, td); 148 fdrop(fp, td); 149 return (0); 150} 151 152static int 153portal_unmount(mp, mntflags, td) 154 struct mount *mp; 155 int mntflags; 156 struct thread *td; 157{ 158 int error, flags = 0; 159 160 161 if (mntflags & MNT_FORCE) 162 flags |= FORCECLOSE; 163 164 /* 165 * Clear out buffer cache. I don't think we 166 * ever get anything cached at this level at the 167 * moment, but who knows... 168 */ 169#ifdef notyet 170 mntflushbuf(mp, 0); 171 if (mntinvalbuf(mp, 1)) 172 return (EBUSY); 173#endif 174 /* There is 1 extra root vnode reference (pm_root). */ 175 error = vflush(mp, 1, flags); 176 if (error) 177 return (error); 178 179 /* 180 * Shutdown the socket. This will cause the select in the 181 * daemon to wake up, and then the accept will get ECONNABORTED 182 * which it interprets as a request to go and bury itself. 183 */ 184 soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data, 2); 185 /* 186 * Discard reference to underlying file. Must call closef because 187 * this may be the last reference. 188 */ 189 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0); 190 /* 191 * Finally, throw away the portalmount structure 192 */ 193 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ 194 mp->mnt_data = 0; 195 return (0); 196} 197 198static int 199portal_root(mp, vpp) 200 struct mount *mp; 201 struct vnode **vpp; 202{ 203 struct thread *td = curthread; /* XXX */ 204 struct vnode *vp; 205 206 /* 207 * Return locked reference to root. 208 */ 209 vp = VFSTOPORTAL(mp)->pm_root; 210 VREF(vp); 211 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 212 *vpp = vp; 213 return (0); 214} 215 216static int 217portal_statfs(mp, sbp, td) 218 struct mount *mp; 219 struct statfs *sbp; 220 struct thread *td; 221{ 222 223 sbp->f_flags = 0; 224 sbp->f_bsize = DEV_BSIZE; 225 sbp->f_iosize = DEV_BSIZE; 226 sbp->f_blocks = 2; /* 1K to keep df happy */ 227 sbp->f_bfree = 0; 228 sbp->f_bavail = 0; 229 sbp->f_files = 1; /* Allow for "." */ 230 sbp->f_ffree = 0; /* See comments above */ 231 if (sbp != &mp->mnt_stat) { 232 sbp->f_type = mp->mnt_vfc->vfc_typenum; 233 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 234 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 235 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 236 } 237 return (0); 238} 239 240static struct vfsops portal_vfsops = { 241 portal_mount, 242 vfs_stdstart, 243 portal_unmount, 244 portal_root, 245 vfs_stdquotactl, 246 portal_statfs, 247 vfs_stdsync, 248 vfs_stdvget, 249 vfs_stdfhtovp, 250 vfs_stdcheckexp, 251 vfs_stdvptofh, 252 vfs_stdinit, 253 vfs_stduninit, 254 vfs_stdextattrctl, 255}; 256 257VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC); 258