portal_vfsops.c revision 116271
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 116271 2003-06-12 20:48:38Z phk $ 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/mutex.h> 52#include <sys/malloc.h> 53#include <sys/file.h> /* Must come after sys/malloc.h */ 54#include <sys/mount.h> 55#include <sys/proc.h> 56#include <sys/protosw.h> 57#include <sys/socket.h> 58#include <sys/socketvar.h> 59#include <sys/vnode.h> 60 61#include <fs/portalfs/portal.h> 62 63static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure"); 64 65static vfs_mount_t portal_mount; 66static vfs_unmount_t portal_unmount; 67static vfs_root_t portal_root; 68static vfs_statfs_t portal_statfs; 69 70/* 71 * Mount the per-process file descriptors (/dev/fd) 72 */ 73static int 74portal_mount(mp, path, data, ndp, td) 75 struct mount *mp; 76 char *path; 77 caddr_t data; 78 struct nameidata *ndp; 79 struct thread *td; 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 size_t 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 if ((error = fget(td, args.pa_socket, &fp)) != 0) 101 return (error); 102 if (fp->f_type != DTYPE_SOCKET) { 103 fdrop(fp, td); 104 return(ENOTSOCK); 105 } 106 so = fp->f_data; /* XXX race against userland */ 107 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 108 fdrop(fp, td); 109 return (ESOCKTNOSUPPORT); 110 } 111 112 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 113 M_TEMP, M_WAITOK); 114 115 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 116 M_PORTALFSMNT, M_WAITOK); /* XXX */ 117 118 error = getnewvnode("portal", mp, portal_vnodeop_p, &rvp); /* XXX */ 119 if (error) { 120 FREE(fmp, M_PORTALFSMNT); 121 FREE(pn, M_TEMP); 122 fdrop(fp, td); 123 return (error); 124 } 125 126 rvp->v_data = pn; 127 rvp->v_type = VDIR; 128 rvp->v_vflag |= VV_ROOT; 129 VTOPORTAL(rvp)->pt_arg = 0; 130 VTOPORTAL(rvp)->pt_size = 0; 131 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 132 fmp->pm_root = rvp; 133 fhold(fp); 134 fmp->pm_server = fp; 135 136 mp->mnt_flag |= MNT_LOCAL; 137 mp->mnt_data = (qaddr_t) fmp; 138 vfs_getnewfsid(mp); 139 140 (void)copyinstr(args.pa_config, 141 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 142 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 143 144#ifdef notdef 145 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 146 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 147#endif 148 149 (void)portal_statfs(mp, &mp->mnt_stat, td); 150 fdrop(fp, td); 151 return (0); 152} 153 154static int 155portal_unmount(mp, mntflags, td) 156 struct mount *mp; 157 int mntflags; 158 struct thread *td; 159{ 160 int error, flags = 0; 161 162 163 if (mntflags & MNT_FORCE) 164 flags |= FORCECLOSE; 165 166 /* 167 * Clear out buffer cache. I don't think we 168 * ever get anything cached at this level at the 169 * moment, but who knows... 170 */ 171#ifdef notyet 172 mntflushbuf(mp, 0); 173 if (mntinvalbuf(mp, 1)) 174 return (EBUSY); 175#endif 176 /* There is 1 extra root vnode reference (pm_root). */ 177 error = vflush(mp, 1, flags); 178 if (error) 179 return (error); 180 181 /* 182 * Shutdown the socket. This will cause the select in the 183 * daemon to wake up, and then the accept will get ECONNABORTED 184 * which it interprets as a request to go and bury itself. 185 */ 186 soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2); 187 /* 188 * Discard reference to underlying file. Must call closef because 189 * this may be the last reference. 190 */ 191 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0); 192 /* 193 * Finally, throw away the portalmount structure 194 */ 195 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ 196 mp->mnt_data = 0; 197 return (0); 198} 199 200static int 201portal_root(mp, vpp) 202 struct mount *mp; 203 struct vnode **vpp; 204{ 205 struct thread *td = curthread; /* XXX */ 206 struct vnode *vp; 207 208 /* 209 * Return locked reference to root. 210 */ 211 vp = VFSTOPORTAL(mp)->pm_root; 212 VREF(vp); 213 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 214 *vpp = vp; 215 return (0); 216} 217 218static int 219portal_statfs(mp, sbp, td) 220 struct mount *mp; 221 struct statfs *sbp; 222 struct thread *td; 223{ 224 225 sbp->f_flags = 0; 226 sbp->f_bsize = DEV_BSIZE; 227 sbp->f_iosize = DEV_BSIZE; 228 sbp->f_blocks = 2; /* 1K to keep df happy */ 229 sbp->f_bfree = 0; 230 sbp->f_bavail = 0; 231 sbp->f_files = 1; /* Allow for "." */ 232 sbp->f_ffree = 0; /* See comments above */ 233 if (sbp != &mp->mnt_stat) { 234 sbp->f_type = mp->mnt_vfc->vfc_typenum; 235 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 236 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 237 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 238 } 239 return (0); 240} 241 242static struct vfsops portal_vfsops = { 243 .vfs_mount = portal_mount, 244 .vfs_root = portal_root, 245 .vfs_statfs = portal_statfs, 246 .vfs_unmount = portal_unmount, 247}; 248 249VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC); 250