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
60 static MALLOC_DEFINE(M_PORTALFSMNT, "portal_mount", "PORTAL mount structure");
61
62 static vfs_unmount_t portal_unmount;
63 static vfs_root_t portal_root;
64 static vfs_statfs_t portal_statfs;
65
66 static const char *portal_opts[] = {
67 "socket", "config",
68 NULL
69 };
70
71 static int
72 portal_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 */
93 static int
94 portal_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
175 static int
176 portal_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
220 static int
221 portal_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
238 static int
239 portal_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
255 static 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
263 VFS_SET(portal_vfsops, portalfs, VFCF_SYNTHETIC);
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