summaryrefslogtreecommitdiff
path: root/sys/miscfs/procfs/procfs_vfsops.c
blob: f146d1c14aeb726de4c24da9c68f6cc7ff999492 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
/*	$NetBSD: procfs_vfsops.c,v 1.51 2003/12/04 19:38:24 atatat Exp $	*/

/*
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)procfs_vfsops.c	8.7 (Berkeley) 5/10/95
 */

/*
 * Copyright (c) 1993 Jan-Simon Pendry
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)procfs_vfsops.c	8.7 (Berkeley) 5/10/95
 */

/*
 * procfs VFS interface
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: procfs_vfsops.c,v 1.51 2003/12/04 19:38:24 atatat Exp $");

#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/syslog.h>
#include <sys/mount.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/malloc.h>

#include <miscfs/procfs/procfs.h>

#include <uvm/uvm_extern.h>			/* for PAGE_SIZE */

void	procfs_init __P((void));
void	procfs_reinit __P((void));
void	procfs_done __P((void));
int	procfs_mount __P((struct mount *, const char *, void *,
			  struct nameidata *, struct proc *));
int	procfs_start __P((struct mount *, int, struct proc *));
int	procfs_unmount __P((struct mount *, int, struct proc *));
int	procfs_quotactl __P((struct mount *, int, uid_t, caddr_t,
			     struct proc *));
int	procfs_statfs __P((struct mount *, struct statfs *, struct proc *));
int	procfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
int	procfs_vget __P((struct mount *, ino_t, struct vnode **));
int	procfs_fhtovp __P((struct mount *, struct fid *, struct vnode **));
int	procfs_checkexp __P((struct mount *, struct mbuf *, int *,
			   struct ucred **));
int	procfs_vptofh __P((struct vnode *, struct fid *));
/*
 * VFS Operations.
 *
 * mount system call
 */
/* ARGSUSED */
int
procfs_mount(mp, path, data, ndp, p)
	struct mount *mp;
	const char *path;
	void *data;
	struct nameidata *ndp;
	struct proc *p;
{
	struct procfsmount *pmnt;
	struct procfs_args args;
	int error;

	if (UIO_MX & (UIO_MX-1)) {
		log(LOG_ERR, "procfs: invalid directory entry size");
		return (EINVAL);
	}

	if (mp->mnt_flag & MNT_GETARGS) {
		pmnt = VFSTOPROC(mp);
		if (pmnt == NULL)
			return EIO;
		args.version = PROCFS_ARGSVERSION;
		args.flags = pmnt->pmnt_flags;
		return copyout(&args, data, sizeof(args));
	}

	if (mp->mnt_flag & MNT_UPDATE)
		return (EOPNOTSUPP);

	if (data != NULL) {
		error = copyin(data, &args, sizeof args);
		if (error != 0)
			return error;

		if (args.version != PROCFS_ARGSVERSION)
			return EINVAL;
	} else
		args.flags = 0;

	mp->mnt_flag |= MNT_LOCAL;
	pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount),
	    M_UFSMNT, M_WAITOK);   /* XXX need new malloc type */

	mp->mnt_data = pmnt;
	vfs_getnewfsid(mp);

	error = set_statfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE,
	    mp, p);
	pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp);
	pmnt->pmnt_flags = args.flags;

	return error;
}

/*
 * unmount system call
 */
int
procfs_unmount(mp, mntflags, p)
	struct mount *mp;
	int mntflags;
	struct proc *p;
{
	int error;
	int flags = 0;

	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;

	if ((error = vflush(mp, 0, flags)) != 0)
		return (error);

	exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook);

	free(mp->mnt_data, M_UFSMNT);
	mp->mnt_data = 0;

	return (0);
}

int
procfs_root(mp, vpp)
	struct mount *mp;
	struct vnode **vpp;
{

	return (procfs_allocvp(mp, vpp, 0, PFSroot, -1));
}

/* ARGSUSED */
int
procfs_start(mp, flags, p)
	struct mount *mp;
	int flags;
	struct proc *p;
{

	return (0);
}

/*
 * Get file system statistics.
 */
int
procfs_statfs(mp, sbp, p)
	struct mount *mp;
	struct statfs *sbp;
	struct proc *p;
{

	sbp->f_bsize = PAGE_SIZE;
	sbp->f_iosize = PAGE_SIZE;
	sbp->f_blocks = 1;	/* avoid divide by zero in some df's */
	sbp->f_bfree = 0;
	sbp->f_bavail = 0;
	sbp->f_files = maxproc;			/* approx */
	sbp->f_ffree = maxproc - nprocs;	/* approx */
#ifdef COMPAT_09
	sbp->f_type = 10;
#else
	sbp->f_type = 0;
#endif
	copy_statfs_info(sbp, mp);
	return (0);
}

/*ARGSUSED*/
int
procfs_quotactl(mp, cmds, uid, arg, p)
	struct mount *mp;
	int cmds;
	uid_t uid;
	caddr_t arg;
	struct proc *p;
{

	return (EOPNOTSUPP);
}

/*ARGSUSED*/
int
procfs_sync(mp, waitfor, uc, p)
	struct mount *mp;
	int waitfor;
	struct ucred *uc;
	struct proc *p;
{

	return (0);
}

/*ARGSUSED*/
int
procfs_vget(mp, ino, vpp)
	struct mount *mp;
	ino_t ino;
	struct vnode **vpp;
{
	return (EOPNOTSUPP);
}

/*ARGSUSED*/
int
procfs_fhtovp(mp, fhp, vpp)
	struct mount *mp;
	struct fid *fhp;
	struct vnode **vpp;
{

	return (EINVAL);
}

/*ARGSUSED*/
int
procfs_checkexp(mp, mb, what, anon)
	struct mount *mp;
	struct mbuf *mb;
	int *what;
	struct ucred **anon;
{

	return (EINVAL);
}

/*ARGSUSED*/
int
procfs_vptofh(vp, fhp)
	struct vnode *vp;
	struct fid *fhp;
{

	return (EINVAL);
}

void
procfs_init()
{
	procfs_hashinit();
}

void
procfs_reinit()
{
	procfs_hashreinit();
}

void
procfs_done()
{
	procfs_hashdone();
}

SYSCTL_SETUP(sysctl_vfs_procfs_setup, "sysctl vfs.procfs subtree setup")
{

	sysctl_createv(SYSCTL_PERMANENT,
		       CTLTYPE_NODE, "vfs", NULL,
		       NULL, 0, NULL, 0,
		       CTL_VFS, CTL_EOL);
	sysctl_createv(SYSCTL_PERMANENT,
		       CTLTYPE_NODE, "procfs", NULL,
		       NULL, 0, NULL, 0,
		       CTL_VFS, 12, CTL_EOL);
	/*
	 * XXX the "12" above could be dynamic, thereby eliminating
	 * one more instance of the "number to vfs" mapping problem,
	 * but "12" is the order as taken from sys/mount.h
	 */
}

extern const struct vnodeopv_desc procfs_vnodeop_opv_desc;

const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = {
	&procfs_vnodeop_opv_desc,
	NULL,
};

struct vfsops procfs_vfsops = {
	MOUNT_PROCFS,
	procfs_mount,
	procfs_start,
	procfs_unmount,
	procfs_root,
	procfs_quotactl,
	procfs_statfs,
	procfs_sync,
	procfs_vget,
	procfs_fhtovp,
	procfs_vptofh,
	procfs_init,
	procfs_reinit,
	procfs_done,
	NULL,
	NULL,				/* vfs_mountroot */
	procfs_checkexp,
	procfs_vnodeopv_descs,
};