portal_vfsops.c revision 132093
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: head/sys/fs/portalfs/portal_vfsops.c 132093 2004-07-13 09:46:46Z phk $ 35 */ 36 37/* 38 * Portal Filesystem 39 */ 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/domain.h> 44#include <sys/filedesc.h> 45#include <sys/kernel.h> 46#include <sys/lock.h> 47#include <sys/mutex.h> 48#include <sys/malloc.h> 49#include <sys/file.h> /* Must come after sys/malloc.h */ 50#include <sys/mount.h> 51#include <sys/proc.h> 52#include <sys/protosw.h> 53#include <sys/socket.h> 54#include <sys/socketvar.h> 55#include <sys/vnode.h> 56 57#include <fs/portalfs/portal.h> 58 59static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure"); 60 61static vfs_mount_t portal_mount; 62static vfs_unmount_t portal_unmount; 63static vfs_root_t portal_root; 64static vfs_statfs_t portal_statfs; 65 66/* 67 * Mount the per-process file descriptors (/dev/fd) 68 */ 69static int 70portal_mount(mp, path, data, ndp, td) 71 struct mount *mp; 72 char *path; 73 caddr_t data; 74 struct nameidata *ndp; 75 struct thread *td; 76{ 77 struct file *fp; 78 struct portal_args args; 79 struct portalmount *fmp; 80 struct socket *so; 81 struct vnode *rvp; 82 struct portalnode *pn; 83 size_t size; 84 int error; 85 86 /* 87 * Update is a no-op 88 */ 89 if (mp->mnt_flag & MNT_UPDATE) 90 return (EOPNOTSUPP); 91 92 error = copyin(data, (caddr_t) &args, sizeof(struct portal_args)); 93 if (error) 94 return (error); 95 96 if ((error = fget(td, args.pa_socket, &fp)) != 0) 97 return (error); 98 if (fp->f_type != DTYPE_SOCKET) { 99 fdrop(fp, td); 100 return(ENOTSOCK); 101 } 102 so = fp->f_data; /* XXX race against userland */ 103 if (so->so_proto->pr_domain->dom_family != AF_UNIX) { 104 fdrop(fp, td); 105 return (ESOCKTNOSUPPORT); 106 } 107 108 MALLOC(pn, struct portalnode *, sizeof(struct portalnode), 109 M_TEMP, M_WAITOK); 110 111 MALLOC(fmp, struct portalmount *, sizeof(struct portalmount), 112 M_PORTALFSMNT, M_WAITOK); /* XXX */ 113 114 error = getnewvnode("portal", mp, portal_vnodeop_p, &rvp); /* XXX */ 115 if (error) { 116 FREE(fmp, M_PORTALFSMNT); 117 FREE(pn, M_TEMP); 118 fdrop(fp, td); 119 return (error); 120 } 121 122 rvp->v_data = pn; 123 rvp->v_type = VDIR; 124 rvp->v_vflag |= VV_ROOT; 125 VTOPORTAL(rvp)->pt_arg = 0; 126 VTOPORTAL(rvp)->pt_size = 0; 127 VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID; 128 fmp->pm_root = rvp; 129 fhold(fp); 130 fmp->pm_server = fp; 131 132 mp->mnt_flag |= MNT_LOCAL; 133 mp->mnt_data = (qaddr_t) fmp; 134 vfs_getnewfsid(mp); 135 136 (void)copyinstr(args.pa_config, 137 mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 138 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 139 140#ifdef notdef 141 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 142 bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal")); 143#endif 144 145 (void)portal_statfs(mp, &mp->mnt_stat, td); 146 fdrop(fp, td); 147 return (0); 148} 149 150static int 151portal_unmount(mp, mntflags, td) 152 struct mount *mp; 153 int mntflags; 154 struct thread *td; 155{ 156 int error, flags = 0; 157 158 159 if (mntflags & MNT_FORCE) 160 flags |= FORCECLOSE; 161 162 /* 163 * Clear out buffer cache. I don't think we 164 * ever get anything cached at this level at the 165 * moment, but who knows... 166 */ 167#ifdef notyet 168 mntflushbuf(mp, 0); 169 if (mntinvalbuf(mp, 1)) 170 return (EBUSY); 171#endif 172 /* There is 1 extra root vnode reference (pm_root). */ 173 error = vflush(mp, 1, flags, td); 174 if (error) 175 return (error); 176 177 /* 178 * Shutdown the socket. This will cause the select in the 179 * daemon to wake up, and then the accept will get ECONNABORTED 180 * which it interprets as a request to go and bury itself. 181 */ 182 soshutdown(VFSTOPORTAL(mp)->pm_server->f_data, 2); 183 /* 184 * Discard reference to underlying file. Must call closef because 185 * this may be the last reference. 186 */ 187 closef(VFSTOPORTAL(mp)->pm_server, (struct thread *) 0); 188 /* 189 * Finally, throw away the portalmount structure 190 */ 191 free(mp->mnt_data, M_PORTALFSMNT); /* XXX */ 192 mp->mnt_data = 0; 193 return (0); 194} 195 196static int 197portal_root(mp, vpp, td) 198 struct mount *mp; 199 struct vnode **vpp; 200 struct thread *td; 201{ 202 struct vnode *vp; 203 204 /* 205 * Return locked reference to root. 206 */ 207 vp = VFSTOPORTAL(mp)->pm_root; 208 VREF(vp); 209 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 210 *vpp = vp; 211 return (0); 212} 213 214static int 215portal_statfs(mp, sbp, td) 216 struct mount *mp; 217 struct statfs *sbp; 218 struct thread *td; 219{ 220 221 sbp->f_flags = 0; 222 sbp->f_bsize = DEV_BSIZE; 223 sbp->f_iosize = DEV_BSIZE; 224 sbp->f_blocks = 2; /* 1K to keep df happy */ 225 sbp->f_bfree = 0; 226 sbp->f_bavail = 0; 227 sbp->f_files = 1; /* Allow for "." */ 228 sbp->f_ffree = 0; /* See comments above */ 229 if (sbp != &mp->mnt_stat) { 230 sbp->f_type = mp->mnt_vfc->vfc_typenum; 231 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 232 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 233 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 234 } 235 return (0); 236} 237 238static struct vfsops portal_vfsops = { 239 .vfs_mount = portal_mount, 240 .vfs_root = portal_root, 241 .vfs_statfs = portal_statfs, 242 .vfs_unmount = portal_unmount, 243}; 244 245VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC); 246