kernfs_vfsops.c revision 1.50 1 1.50 darrenr /* $NetBSD: kernfs_vfsops.c,v 1.50 2003/06/28 14:22:02 darrenr Exp $ */
2 1.18 cgd
3 1.1 cgd /*
4 1.32 fvdl * Copyright (c) 1992, 1993, 1995
5 1.15 mycroft * The Regents of the University of California. All rights reserved.
6 1.1 cgd *
7 1.11 cgd * This code is derived from software donated to Berkeley by
8 1.1 cgd * Jan-Simon Pendry.
9 1.1 cgd *
10 1.2 cgd * Redistribution and use in source and binary forms, with or without
11 1.2 cgd * modification, are permitted provided that the following conditions
12 1.2 cgd * are met:
13 1.2 cgd * 1. Redistributions of source code must retain the above copyright
14 1.2 cgd * notice, this list of conditions and the following disclaimer.
15 1.2 cgd * 2. Redistributions in binary form must reproduce the above copyright
16 1.2 cgd * notice, this list of conditions and the following disclaimer in the
17 1.2 cgd * documentation and/or other materials provided with the distribution.
18 1.2 cgd * 3. All advertising materials mentioning features or use of this software
19 1.2 cgd * must display the following acknowledgement:
20 1.11 cgd * This product includes software developed by the University of
21 1.11 cgd * California, Berkeley and its contributors.
22 1.2 cgd * 4. Neither the name of the University nor the names of its contributors
23 1.2 cgd * may be used to endorse or promote products derived from this software
24 1.2 cgd * without specific prior written permission.
25 1.1 cgd *
26 1.2 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 1.2 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 1.2 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 1.2 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 1.2 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 1.2 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 1.2 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 1.2 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 1.2 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 1.2 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 1.2 cgd * SUCH DAMAGE.
37 1.1 cgd *
38 1.32 fvdl * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
39 1.1 cgd */
40 1.1 cgd
41 1.1 cgd /*
42 1.1 cgd * Kernel params Filesystem
43 1.1 cgd */
44 1.42 lukem
45 1.42 lukem #include <sys/cdefs.h>
46 1.50 darrenr __KERNEL_RCSID(0, "$NetBSD: kernfs_vfsops.c,v 1.50 2003/06/28 14:22:02 darrenr Exp $");
47 1.33 jonathan
48 1.40 mrg #if defined(_KERNEL_OPT)
49 1.33 jonathan #include "opt_compat_netbsd.h"
50 1.33 jonathan #endif
51 1.1 cgd
52 1.9 mycroft #include <sys/param.h>
53 1.9 mycroft #include <sys/systm.h>
54 1.15 mycroft #include <sys/conf.h>
55 1.9 mycroft #include <sys/proc.h>
56 1.9 mycroft #include <sys/vnode.h>
57 1.9 mycroft #include <sys/mount.h>
58 1.9 mycroft #include <sys/namei.h>
59 1.9 mycroft #include <sys/malloc.h>
60 1.15 mycroft
61 1.15 mycroft #include <miscfs/specfs/specdev.h>
62 1.9 mycroft #include <miscfs/kernfs/kernfs.h>
63 1.1 cgd
64 1.47 thorpej MALLOC_DEFINE(M_KERNFSMNT, "kernfs mount", "kernfs mount structures");
65 1.47 thorpej
66 1.15 mycroft dev_t rrootdev = NODEV;
67 1.15 mycroft
68 1.25 christos void kernfs_init __P((void));
69 1.36 jdolecek void kernfs_done __P((void));
70 1.25 christos void kernfs_get_rrootdev __P((void));
71 1.29 cgd int kernfs_mount __P((struct mount *, const char *, void *,
72 1.50 darrenr struct nameidata *, struct lwp *));
73 1.50 darrenr int kernfs_start __P((struct mount *, int, struct lwp *));
74 1.50 darrenr int kernfs_unmount __P((struct mount *, int, struct lwp *));
75 1.50 darrenr int kernfs_root __P((struct mount *, struct vnode **, struct lwp *));
76 1.50 darrenr int kernfs_statfs __P((struct mount *, struct statfs *, struct lwp *));
77 1.25 christos int kernfs_quotactl __P((struct mount *, int, uid_t, caddr_t,
78 1.50 darrenr struct lwp *));
79 1.50 darrenr int kernfs_sync __P((struct mount *, int, struct ucred *, struct lwp *));
80 1.50 darrenr int kernfs_vget __P((struct mount *, ino_t, struct vnode **, struct lwp *));
81 1.50 darrenr int kernfs_fhtovp __P((struct mount *, struct fid *, struct vnode **,
82 1.50 darrenr struct lwp *));
83 1.35 wrstuden int kernfs_checkexp __P((struct mount *, struct mbuf *, int *,
84 1.35 wrstuden struct ucred **));
85 1.25 christos int kernfs_vptofh __P((struct vnode *, struct fid *));
86 1.32 fvdl int kernfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t,
87 1.50 darrenr struct lwp *));
88 1.25 christos
89 1.25 christos void
90 1.1 cgd kernfs_init()
91 1.1 cgd {
92 1.49 christos #ifdef _LKM
93 1.49 christos malloc_type_attach(M_KERNFSMNT);
94 1.49 christos #endif
95 1.10 cgd }
96 1.10 cgd
97 1.11 cgd void
98 1.36 jdolecek kernfs_done()
99 1.36 jdolecek {
100 1.49 christos #ifdef _LKM
101 1.49 christos malloc_type_detach(M_KERNFSMNT);
102 1.49 christos #endif
103 1.36 jdolecek }
104 1.36 jdolecek
105 1.36 jdolecek void
106 1.15 mycroft kernfs_get_rrootdev()
107 1.10 cgd {
108 1.16 mycroft static int tried = 0;
109 1.10 cgd
110 1.16 mycroft if (tried) {
111 1.15 mycroft /* Already did it once. */
112 1.15 mycroft return;
113 1.15 mycroft }
114 1.16 mycroft tried = 1;
115 1.16 mycroft
116 1.16 mycroft if (rootdev == NODEV)
117 1.16 mycroft return;
118 1.45 gehenna rrootdev = devsw_blk2chr(rootdev);
119 1.45 gehenna if (rrootdev != NODEV) {
120 1.39 mrg #ifdef KERNFS_DIAGNOSTIC
121 1.39 mrg printf("kernfs_mount: rootdev = %u.%u; rrootdev = %u.%u\n",
122 1.39 mrg major(rootdev), minor(rootdev), major(rrootdev), minor(rrootdev));
123 1.39 mrg #endif
124 1.45 gehenna return;
125 1.10 cgd }
126 1.16 mycroft rrootdev = NODEV;
127 1.28 christos printf("kernfs_get_rrootdev: no raw root device\n");
128 1.1 cgd }
129 1.1 cgd
130 1.1 cgd /*
131 1.15 mycroft * Mount the Kernel params filesystem
132 1.1 cgd */
133 1.25 christos int
134 1.50 darrenr kernfs_mount(mp, path, data, ndp, l)
135 1.1 cgd struct mount *mp;
136 1.29 cgd const char *path;
137 1.29 cgd void *data;
138 1.1 cgd struct nameidata *ndp;
139 1.50 darrenr struct lwp *l;
140 1.1 cgd {
141 1.1 cgd int error = 0;
142 1.1 cgd struct kernfs_mount *fmp;
143 1.1 cgd struct vnode *rvp;
144 1.1 cgd
145 1.1 cgd #ifdef KERNFS_DIAGNOSTIC
146 1.30 christos printf("kernfs_mount(mp = %p)\n", mp);
147 1.1 cgd #endif
148 1.1 cgd
149 1.46 christos if (mp->mnt_flag & MNT_GETARGS)
150 1.46 christos return 0;
151 1.1 cgd /*
152 1.1 cgd * Update is a no-op
153 1.1 cgd */
154 1.1 cgd if (mp->mnt_flag & MNT_UPDATE)
155 1.1 cgd return (EOPNOTSUPP);
156 1.1 cgd
157 1.25 christos error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp);
158 1.25 christos if (error)
159 1.1 cgd return (error);
160 1.1 cgd
161 1.15 mycroft MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
162 1.47 thorpej M_KERNFSMNT, M_WAITOK);
163 1.1 cgd rvp->v_type = VDIR;
164 1.1 cgd rvp->v_flag |= VROOT;
165 1.1 cgd #ifdef KERNFS_DIAGNOSTIC
166 1.30 christos printf("kernfs_mount: root vp = %p\n", rvp);
167 1.1 cgd #endif
168 1.1 cgd fmp->kf_root = rvp;
169 1.1 cgd mp->mnt_flag |= MNT_LOCAL;
170 1.44 soren mp->mnt_data = fmp;
171 1.37 assar vfs_getnewfsid(mp);
172 1.1 cgd
173 1.48 christos error = set_statfs_info(path, UIO_USERSPACE, "kernfs", UIO_SYSSPACE,
174 1.50 darrenr mp, l);
175 1.1 cgd #ifdef KERNFS_DIAGNOSTIC
176 1.28 christos printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
177 1.1 cgd #endif
178 1.10 cgd
179 1.15 mycroft kernfs_get_rrootdev();
180 1.48 christos return error;
181 1.1 cgd }
182 1.1 cgd
183 1.25 christos int
184 1.50 darrenr kernfs_start(mp, flags, l)
185 1.1 cgd struct mount *mp;
186 1.1 cgd int flags;
187 1.50 darrenr struct lwp *l;
188 1.1 cgd {
189 1.15 mycroft
190 1.1 cgd return (0);
191 1.1 cgd }
192 1.1 cgd
193 1.25 christos int
194 1.50 darrenr kernfs_unmount(mp, mntflags, l)
195 1.1 cgd struct mount *mp;
196 1.1 cgd int mntflags;
197 1.50 darrenr struct lwp *l;
198 1.1 cgd {
199 1.1 cgd int error;
200 1.1 cgd int flags = 0;
201 1.1 cgd struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
202 1.1 cgd
203 1.1 cgd #ifdef KERNFS_DIAGNOSTIC
204 1.30 christos printf("kernfs_unmount(mp = %p)\n", mp);
205 1.1 cgd #endif
206 1.1 cgd
207 1.32 fvdl if (mntflags & MNT_FORCE)
208 1.1 cgd flags |= FORCECLOSE;
209 1.1 cgd
210 1.1 cgd /*
211 1.1 cgd * Clear out buffer cache. I don't think we
212 1.1 cgd * ever get anything cached at this level at the
213 1.1 cgd * moment, but who knows...
214 1.1 cgd */
215 1.1 cgd if (rootvp->v_usecount > 1)
216 1.1 cgd return (EBUSY);
217 1.1 cgd #ifdef KERNFS_DIAGNOSTIC
218 1.28 christos printf("kernfs_unmount: calling vflush\n");
219 1.1 cgd #endif
220 1.25 christos if ((error = vflush(mp, rootvp, flags)) != 0)
221 1.1 cgd return (error);
222 1.1 cgd
223 1.1 cgd #ifdef KERNFS_DIAGNOSTIC
224 1.1 cgd vprint("kernfs root", rootvp);
225 1.15 mycroft #endif
226 1.1 cgd /*
227 1.15 mycroft * Clean out the old root vnode for reuse.
228 1.1 cgd */
229 1.1 cgd vrele(rootvp);
230 1.1 cgd vgone(rootvp);
231 1.1 cgd /*
232 1.1 cgd * Finally, throw away the kernfs_mount structure
233 1.1 cgd */
234 1.47 thorpej free(mp->mnt_data, M_KERNFSMNT);
235 1.1 cgd mp->mnt_data = 0;
236 1.15 mycroft return (0);
237 1.1 cgd }
238 1.1 cgd
239 1.25 christos int
240 1.50 darrenr kernfs_root(mp, vpp, l)
241 1.1 cgd struct mount *mp;
242 1.1 cgd struct vnode **vpp;
243 1.50 darrenr struct lwp *l;
244 1.1 cgd {
245 1.1 cgd struct vnode *vp;
246 1.1 cgd
247 1.1 cgd #ifdef KERNFS_DIAGNOSTIC
248 1.30 christos printf("kernfs_root(mp = %p)\n", mp);
249 1.1 cgd #endif
250 1.1 cgd
251 1.1 cgd /*
252 1.1 cgd * Return locked reference to root.
253 1.1 cgd */
254 1.1 cgd vp = VFSTOKERNFS(mp)->kf_root;
255 1.1 cgd VREF(vp);
256 1.32 fvdl vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
257 1.1 cgd *vpp = vp;
258 1.1 cgd return (0);
259 1.1 cgd }
260 1.1 cgd
261 1.25 christos int
262 1.50 darrenr kernfs_quotactl(mp, cmd, uid, arg, l)
263 1.1 cgd struct mount *mp;
264 1.1 cgd int cmd;
265 1.1 cgd uid_t uid;
266 1.1 cgd caddr_t arg;
267 1.50 darrenr struct lwp *l;
268 1.1 cgd {
269 1.15 mycroft
270 1.1 cgd return (EOPNOTSUPP);
271 1.1 cgd }
272 1.1 cgd
273 1.25 christos int
274 1.50 darrenr kernfs_statfs(mp, sbp, l)
275 1.1 cgd struct mount *mp;
276 1.1 cgd struct statfs *sbp;
277 1.50 darrenr struct lwp *l;
278 1.1 cgd {
279 1.1 cgd
280 1.1 cgd #ifdef KERNFS_DIAGNOSTIC
281 1.30 christos printf("kernfs_statfs(mp = %p)\n", mp);
282 1.1 cgd #endif
283 1.1 cgd
284 1.1 cgd sbp->f_bsize = DEV_BSIZE;
285 1.13 cgd sbp->f_iosize = DEV_BSIZE;
286 1.1 cgd sbp->f_blocks = 2; /* 1K to keep df happy */
287 1.1 cgd sbp->f_bfree = 0;
288 1.1 cgd sbp->f_bavail = 0;
289 1.15 mycroft sbp->f_files = 0;
290 1.15 mycroft sbp->f_ffree = 0;
291 1.32 fvdl #ifdef COMPAT_09
292 1.32 fvdl sbp->f_type = 7;
293 1.32 fvdl #else
294 1.32 fvdl sbp->f_type = 0;
295 1.32 fvdl #endif
296 1.48 christos copy_statfs_info(sbp, mp);
297 1.1 cgd return (0);
298 1.1 cgd }
299 1.1 cgd
300 1.25 christos /*ARGSUSED*/
301 1.25 christos int
302 1.50 darrenr kernfs_sync(mp, waitfor, uc, l)
303 1.1 cgd struct mount *mp;
304 1.1 cgd int waitfor;
305 1.25 christos struct ucred *uc;
306 1.50 darrenr struct lwp *l;
307 1.1 cgd {
308 1.15 mycroft
309 1.1 cgd return (0);
310 1.1 cgd }
311 1.1 cgd
312 1.15 mycroft /*
313 1.15 mycroft * Kernfs flat namespace lookup.
314 1.15 mycroft * Currently unsupported.
315 1.15 mycroft */
316 1.25 christos int
317 1.50 darrenr kernfs_vget(mp, ino, vpp, l)
318 1.15 mycroft struct mount *mp;
319 1.15 mycroft ino_t ino;
320 1.15 mycroft struct vnode **vpp;
321 1.50 darrenr struct lwp *l;
322 1.15 mycroft {
323 1.15 mycroft
324 1.15 mycroft return (EOPNOTSUPP);
325 1.15 mycroft }
326 1.15 mycroft
327 1.25 christos /*ARGSUSED*/
328 1.25 christos int
329 1.50 darrenr kernfs_fhtovp(mp, fhp, vpp, l)
330 1.1 cgd struct mount *mp;
331 1.1 cgd struct fid *fhp;
332 1.35 wrstuden struct vnode **vpp;
333 1.50 darrenr struct lwp *l;
334 1.35 wrstuden {
335 1.35 wrstuden
336 1.35 wrstuden return (EOPNOTSUPP);
337 1.35 wrstuden }
338 1.35 wrstuden
339 1.35 wrstuden /*ARGSUSED*/
340 1.35 wrstuden int
341 1.35 wrstuden kernfs_checkexp(mp, mb, what, anon)
342 1.35 wrstuden struct mount *mp;
343 1.25 christos struct mbuf *mb;
344 1.25 christos int *what;
345 1.25 christos struct ucred **anon;
346 1.1 cgd {
347 1.15 mycroft
348 1.1 cgd return (EOPNOTSUPP);
349 1.1 cgd }
350 1.1 cgd
351 1.25 christos /*ARGSUSED*/
352 1.25 christos int
353 1.1 cgd kernfs_vptofh(vp, fhp)
354 1.1 cgd struct vnode *vp;
355 1.1 cgd struct fid *fhp;
356 1.1 cgd {
357 1.15 mycroft
358 1.1 cgd return (EOPNOTSUPP);
359 1.1 cgd }
360 1.1 cgd
361 1.32 fvdl int
362 1.50 darrenr kernfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, l)
363 1.32 fvdl int *name;
364 1.32 fvdl u_int namelen;
365 1.32 fvdl void *oldp;
366 1.32 fvdl size_t *oldlenp;
367 1.32 fvdl void *newp;
368 1.32 fvdl size_t newlen;
369 1.50 darrenr struct lwp *l;
370 1.32 fvdl {
371 1.32 fvdl return (EOPNOTSUPP);
372 1.32 fvdl }
373 1.32 fvdl
374 1.38 jdolecek extern const struct vnodeopv_desc kernfs_vnodeop_opv_desc;
375 1.31 thorpej
376 1.38 jdolecek const struct vnodeopv_desc * const kernfs_vnodeopv_descs[] = {
377 1.31 thorpej &kernfs_vnodeop_opv_desc,
378 1.31 thorpej NULL,
379 1.31 thorpej };
380 1.31 thorpej
381 1.1 cgd struct vfsops kernfs_vfsops = {
382 1.12 cgd MOUNT_KERNFS,
383 1.1 cgd kernfs_mount,
384 1.1 cgd kernfs_start,
385 1.1 cgd kernfs_unmount,
386 1.1 cgd kernfs_root,
387 1.1 cgd kernfs_quotactl,
388 1.1 cgd kernfs_statfs,
389 1.1 cgd kernfs_sync,
390 1.15 mycroft kernfs_vget,
391 1.1 cgd kernfs_fhtovp,
392 1.1 cgd kernfs_vptofh,
393 1.1 cgd kernfs_init,
394 1.41 chs NULL,
395 1.36 jdolecek kernfs_done,
396 1.32 fvdl kernfs_sysctl,
397 1.31 thorpej NULL, /* vfs_mountroot */
398 1.35 wrstuden kernfs_checkexp,
399 1.31 thorpej kernfs_vnodeopv_descs,
400 1.1 cgd };
401