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