portal_vfsops.c revision 111119
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 111119 2003-02-19 05:47:46Z imp $ 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 int portal_mount(struct mount *mp, char *path, caddr_t data, 66 struct nameidata *ndp, struct thread *td); 67static int portal_unmount(struct mount *mp, int mntflags, 68 struct thread *td); 69static int portal_root(struct mount *mp, struct vnode **vpp); 70static int portal_statfs(struct mount *mp, struct statfs *sbp, 71 struct thread *td); 72 73/* 74 * Mount the per-process file descriptors (/dev/fd) 75 */ 76static int 77portal_mount(mp, path, data, ndp, td) 78 struct mount *mp; 79 char *path; 80 caddr_t data; 81 struct nameidata *ndp; 82 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