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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95 33 * 34 * $FreeBSD$ 35 */ 36 37/* 38 * Portal Filesystem 39 */ 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/capability.h> 44#include <sys/domain.h> 45#include <sys/filedesc.h> 46#include <sys/kernel.h> 47#include <sys/lock.h> 48#include <sys/mutex.h> 49#include <sys/malloc.h> 50#include <sys/file.h> /* Must come after sys/malloc.h */ 51#include <sys/mount.h> 52#include <sys/proc.h> 53#include <sys/protosw.h> 54#include <sys/socket.h> 55#include <sys/socketvar.h> 56#include <sys/vnode.h> 57 58#include <fs/portalfs/portal.h> 59 60static MALLOC_DEFINE(M_PORTALFSMNT, "portal_mount", "PORTAL mount structure"); 61 62static vfs_unmount_t portal_unmount; 63static vfs_root_t portal_root; 64static vfs_statfs_t portal_statfs; 65 66static const char *portal_opts[] = { 67 "socket", "config", 68 NULL 69}; 70 71static int 72portal_cmount(struct mntarg *ma, void *data, uint64_t flags) 73{ 74 struct portal_args args; 75 int error; 76 77 if (data == NULL) 78 return (EINVAL); 79 error = copyin(data, &args, sizeof args); 80 if (error) 81 return (error); 82 83 ma = mount_argf(ma, "socket", "%d", args.pa_socket); 84 ma = mount_argsu(ma, "config", args.pa_config, MAXPATHLEN); 85 error = kernel_mount(ma, flags); 86 87 return (error); 88} 89 90/* 91 * Mount the per-process file descriptors (/dev/fd) 92 */ 93static int 94portal_mount(struct mount *mp) 95{ 96 struct file *fp; 97 struct portalmount *fmp; 98 struct socket *so; 99 struct vnode *rvp; 100 struct thread *td; 101 struct portalnode *pn; 102 int error, v; 103 char *p; 104 105 td = curthread; 106 if (vfs_filteropt(mp->mnt_optnew, portal_opts)) 107 return (EINVAL); 108 109 error = vfs_scanopt(mp->mnt_optnew, "socket", "%d", &v); 110 if (error != 1) 111 return (EINVAL); 112 error = vfs_getopt(mp->mnt_optnew, "config", (void **)&p, NULL); 113 if (error) 114 return (error); 115 116 /* 117 * Capsicum is not incompatible with portalfs, but we don't really 118 * know what rights are required. In the spirit of "better safe than 119 * sorry", pretend that all rights are required for now. 120 */ 121 if ((error = fget(td, v, CAP_MASK_VALID, &fp)) != 0) 122 return (error); 123 if (fp->f_type != DTYPE_SOCKET) { 124 fdrop(fp, td); 125 return(ENOTSOCK); 126 } 127 so = fp->f_data; /* XXX race against userland */ 128 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 129 fdrop(fp, td); 130 return (ESOCKTNOSUPPORT); 131 } 132 133 pn = malloc(sizeof(struct portalnode), 134 M_TEMP, M_WAITOK); 135 136 fmp = malloc(sizeof(struct portalmount), 137 M_PORTALFSMNT, M_WAITOK); /* XXX */ 138 139 error = getnewvnode("portal", mp, &portal_vnodeops, &rvp); /* XXX */ 140 if (error) { 141 free(fmp, M_PORTALFSMNT); 142 free(pn, M_TEMP); 143 fdrop(fp, td); 144 return (error); 145 } 146 147 error = insmntque(rvp, mp); /* XXX: Too early for mpsafe fs */ 148 if (error != 0) { 149 free(fmp, M_PORTALFSMNT); 150 free(pn, M_TEMP); 151 fdrop(fp, td); 152 return (error); 153 } 154 rvp->v_data = pn; 155 rvp->v_type = VDIR; 156 rvp->v_vflag |= VV_ROOT; 157 VTOPORTAL(rvp)->pt_arg = 0; 158 VTOPORTAL(rvp)->pt_size = 0; 159 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 160 fmp->pm_root = rvp; 161 fhold(fp); 162 fmp->pm_server = fp; 163 164 MNT_ILOCK(mp); 165 mp->mnt_flag |= MNT_LOCAL; 166 MNT_IUNLOCK(mp); 167 mp->mnt_data = fmp; 168 vfs_getnewfsid(mp); 169 170 vfs_mountedfrom(mp, p); 171 fdrop(fp, td); 172 return (0); 173} 174 175static int 176portal_unmount(mp, mntflags) 177 struct mount *mp; 178 int mntflags; 179{ 180 int error, flags = 0; 181 182 183 if (mntflags & MNT_FORCE) 184 flags |= FORCECLOSE; 185 186 /* 187 * Clear out buffer cache. I don't think we 188 * ever get anything cached at this level at the 189 * moment, but who knows... 190 */ 191#ifdef notyet 192 mntflushbuf(mp, 0); 193 if (mntinvalbuf(mp, 1)) 194 return (EBUSY); 195#endif 196 /* There is 1 extra root vnode reference (pm_root). */ 197 error = vflush(mp, 1, flags, curthread); 198 if (error) 199 return (error); 200 201 /* 202 * Shutdown the socket. This will cause the select in the 203 * daemon to wake up, and then the accept will get ECONNABORTED 204 * which it interprets as a request to go and bury itself. 205 */ 206 soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2); 207 /* 208 * Discard reference to underlying file. Must call closef because 209 * this may be the last reference. 210 */ 211 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0); 212 /* 213 * Finally, throw away the portalmount structure 214 */ 215 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ 216 mp->mnt_data = 0; 217 return (0); 218} 219 220static int 221portal_root(mp, flags, vpp) 222 struct mount *mp; 223 int flags; 224 struct vnode **vpp; 225{ 226 struct vnode *vp; 227 228 /* 229 * Return locked reference to root. 230 */ 231 vp = VFSTOPORTAL(mp)->pm_root; 232 VREF(vp); 233 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 234 *vpp = vp; 235 return (0); 236} 237 238static int 239portal_statfs(mp, sbp) 240 struct mount *mp; 241 struct statfs *sbp; 242{ 243 244 sbp->f_flags = 0; 245 sbp->f_bsize = DEV_BSIZE; 246 sbp->f_iosize = DEV_BSIZE; 247 sbp->f_blocks = 2; /* 1K to keep df happy */ 248 sbp->f_bfree = 0; 249 sbp->f_bavail = 0; 250 sbp->f_files = 1; /* Allow for "." */ 251 sbp->f_ffree = 0; /* See comments above */ 252 return (0); 253} 254 255static struct vfsops portal_vfsops = { 256 .vfs_cmount = portal_cmount, 257 .vfs_mount = portal_mount, 258 .vfs_root = portal_root, 259 .vfs_statfs = portal_statfs, 260 .vfs_unmount = portal_unmount, 261}; 262 263VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC); 264