rump_vfs.c revision 1.42.2.1 1 /* $NetBSD: rump_vfs.c,v 1.42.2.1 2010/04/30 14:44:30 uebayasi Exp $ */
2
3 /*
4 * Copyright (c) 2008 Antti Kantee. All Rights Reserved.
5 *
6 * Development of this software was supported by the
7 * Finnish Cultural Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: rump_vfs.c,v 1.42.2.1 2010/04/30 14:44:30 uebayasi Exp $");
33
34 #include <sys/param.h>
35 #include <sys/buf.h>
36 #include <sys/conf.h>
37 #include <sys/evcnt.h>
38 #include <sys/filedesc.h>
39 #include <sys/fstrans.h>
40 #include <sys/lockf.h>
41 #include <sys/kthread.h>
42 #include <sys/module.h>
43 #include <sys/namei.h>
44 #include <sys/queue.h>
45 #include <sys/vfs_syscalls.h>
46 #include <sys/vnode.h>
47 #include <sys/wapbl.h>
48
49 #include <miscfs/specfs/specdev.h>
50 #include <miscfs/syncfs/syncfs.h>
51
52 #include <rump/rump.h>
53 #include <rump/rumpuser.h>
54
55 #include "rump_private.h"
56 #include "rump_vfs_private.h"
57
58 struct cwdinfo cwdi0;
59 const char *rootfstype = ROOT_FSTYPE_ANY;
60
61 static void rump_rcvp_lwpset(struct vnode *, struct vnode *, struct lwp *);
62
63 static void
64 pvfs_init(struct proc *p)
65 {
66
67 p->p_cwdi = cwdinit();
68 }
69
70 static void
71 pvfs_rele(struct proc *p)
72 {
73
74 cwdfree(p->p_cwdi);
75 }
76
77 void
78 rump_vfs_init(void)
79 {
80 extern struct vfsops rumpfs_vfsops;
81 char buf[64];
82 int error;
83 int rv, i;
84 extern int dovfsusermount; /* XXX */
85
86 dovfsusermount = 1; /* XXX */
87
88 if (rumpuser_getenv("RUMP_NVNODES", buf, sizeof(buf), &error) == 0) {
89 desiredvnodes = strtoul(buf, NULL, 10);
90 } else {
91 desiredvnodes = 1<<16;
92 }
93
94 rumpblk_init();
95
96 for (i = 0; i < ncpu; i++) {
97 struct cpu_info *ci = cpu_lookup(i);
98 cache_cpu_init(ci);
99 }
100 vfsinit();
101 bufinit();
102 cwd_sys_init();
103 lf_init();
104 spec_init();
105 fstrans_init();
106
107 if (rump_threads) {
108 if ((rv = kthread_create(PRI_BIO, KTHREAD_MPSAFE, NULL,
109 rumpuser_biothread, rump_biodone, NULL, "rmpabio")) != 0)
110 panic("syncer thread create failed: %d", rv);
111 }
112
113 root_device = &rump_rootdev;
114
115 /* bootstrap cwdi (rest done in vfs_mountroot() */
116 rw_init(&cwdi0.cwdi_lock);
117 proc0.p_cwdi = &cwdi0;
118 proc0.p_cwdi = cwdinit();
119
120 vfs_attach(&rumpfs_vfsops);
121 vfs_mountroot();
122
123 /* "mtree": create /dev */
124 do_sys_mkdir("/dev", 0777, UIO_SYSSPACE);
125 rump_devnull_init();
126
127 rump_proc_vfs_init = pvfs_init;
128 rump_proc_vfs_release = pvfs_rele;
129
130 if (rump_threads) {
131 if ((rv = kthread_create(PRI_IOFLUSH, KTHREAD_MPSAFE, NULL,
132 sched_sync, NULL, NULL, "ioflush")) != 0)
133 panic("syncer thread create failed: %d", rv);
134 } else {
135 syncdelay = 0;
136 }
137
138 /*
139 * On archs where the native kernel ABI is supported, map
140 * host module directory to rump. This means that kernel
141 * modules from the host will be autoloaded to rump kernels.
142 */
143 #ifdef _RUMP_NATIVE_ABI
144 rump_etfs_register(module_base, module_base, RUMP_ETFS_DIR_SUBDIRS);
145 #endif
146
147 module_init_class(MODULE_CLASS_VFS);
148 }
149
150 void
151 rump_vfs_fini(void)
152 {
153
154 vfs_shutdown();
155 }
156
157 struct componentname *
158 rump_makecn(u_long nameiop, u_long flags, const char *name, size_t namelen,
159 kauth_cred_t creds, struct lwp *l)
160 {
161 struct componentname *cnp;
162 const char *cp = NULL;
163
164 cnp = kmem_zalloc(sizeof(struct componentname), KM_SLEEP);
165
166 cnp->cn_nameiop = nameiop;
167 cnp->cn_flags = flags;
168
169 cnp->cn_pnbuf = PNBUF_GET();
170 strcpy(cnp->cn_pnbuf, name);
171 cnp->cn_nameptr = cnp->cn_pnbuf;
172 cnp->cn_namelen = namelen;
173 cnp->cn_hash = namei_hash(name, &cp);
174
175 cnp->cn_cred = creds;
176
177 return cnp;
178 }
179
180 void
181 rump_freecn(struct componentname *cnp, int flags)
182 {
183
184 if (flags & RUMPCN_FREECRED)
185 rump_cred_put(cnp->cn_cred);
186
187 if ((cnp->cn_flags & SAVENAME) == 0 || flags & RUMPCN_FORCEFREE)
188 PNBUF_PUT(cnp->cn_pnbuf);
189 kmem_free(cnp, sizeof(*cnp));
190 }
191
192 int
193 rump_checksavecn(struct componentname *cnp)
194 {
195
196 if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0) {
197 return 0;
198 } else {
199 cnp->cn_flags |= HASBUF;
200 return 1;
201 }
202 }
203
204 /* hey baby, what's your namei? */
205 int
206 rump_namei(uint32_t op, uint32_t flags, const char *namep,
207 struct vnode **dvpp, struct vnode **vpp, struct componentname **cnpp)
208 {
209 struct nameidata nd;
210 int rv;
211
212 NDINIT(&nd, op, flags, UIO_SYSSPACE, namep);
213 rv = namei(&nd);
214 if (rv)
215 return rv;
216
217 if (dvpp) {
218 KASSERT(flags & LOCKPARENT);
219 *dvpp = nd.ni_dvp;
220 } else {
221 KASSERT((flags & LOCKPARENT) == 0);
222 }
223
224 if (vpp) {
225 *vpp = nd.ni_vp;
226 } else {
227 if (nd.ni_vp) {
228 if (flags & LOCKLEAF)
229 vput(nd.ni_vp);
230 else
231 vrele(nd.ni_vp);
232 }
233 }
234
235 if (cnpp) {
236 struct componentname *cnp;
237
238 cnp = kmem_alloc(sizeof(*cnp), KM_SLEEP);
239 memcpy(cnp, &nd.ni_cnd, sizeof(*cnp));
240 *cnpp = cnp;
241 } else if (nd.ni_cnd.cn_flags & HASBUF) {
242 panic("%s: pathbuf mismatch", __func__);
243 }
244
245 return rv;
246 }
247
248 void
249 rump_getvninfo(struct vnode *vp, enum vtype *vtype,
250 voff_t *vsize, dev_t *vdev)
251 {
252
253 *vtype = vp->v_type;
254 *vsize = vp->v_size;
255 if (vp->v_specnode)
256 *vdev = vp->v_rdev;
257 else
258 *vdev = 0;
259 }
260
261 struct vfsops *
262 rump_vfslist_iterate(struct vfsops *ops)
263 {
264
265 if (ops == NULL)
266 return LIST_FIRST(&vfs_list);
267 else
268 return LIST_NEXT(ops, vfs_list);
269 }
270
271 struct vfsops *
272 rump_vfs_getopsbyname(const char *name)
273 {
274
275 return vfs_getopsbyname(name);
276 }
277
278 int
279 rump_vfs_getmp(const char *path, struct mount **mpp)
280 {
281 struct vnode *vp;
282 int rv;
283
284 if ((rv = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp)) != 0)
285 return rv;
286
287 *mpp = vp->v_mount;
288 vrele(vp);
289 return 0;
290 }
291
292 struct vattr*
293 rump_vattr_init(void)
294 {
295 struct vattr *vap;
296
297 vap = kmem_alloc(sizeof(struct vattr), KM_SLEEP);
298 vattr_null(vap);
299
300 return vap;
301 }
302
303 void
304 rump_vattr_settype(struct vattr *vap, enum vtype vt)
305 {
306
307 vap->va_type = vt;
308 }
309
310 void
311 rump_vattr_setmode(struct vattr *vap, mode_t mode)
312 {
313
314 vap->va_mode = mode;
315 }
316
317 void
318 rump_vattr_setrdev(struct vattr *vap, dev_t dev)
319 {
320
321 vap->va_rdev = dev;
322 }
323
324 void
325 rump_vattr_free(struct vattr *vap)
326 {
327
328 kmem_free(vap, sizeof(*vap));
329 }
330
331 void
332 rump_vp_incref(struct vnode *vp)
333 {
334
335 vref(vp);
336 }
337
338 int
339 rump_vp_getref(struct vnode *vp)
340 {
341
342 return vp->v_usecount;
343 }
344
345 void
346 rump_vp_rele(struct vnode *vp)
347 {
348
349 vrele(vp);
350 }
351
352 void
353 rump_vp_interlock(struct vnode *vp)
354 {
355
356 mutex_enter(&vp->v_interlock);
357 }
358
359 int
360 rump_vfs_unmount(struct mount *mp, int mntflags)
361 {
362 #if 0
363 struct evcnt *ev;
364
365 printf("event counters:\n");
366 TAILQ_FOREACH(ev, &allevents, ev_list)
367 printf("%s: %llu\n", ev->ev_name, ev->ev_count);
368 #endif
369
370 return VFS_UNMOUNT(mp, mntflags);
371 }
372
373 int
374 rump_vfs_root(struct mount *mp, struct vnode **vpp, int lock)
375 {
376 int rv;
377
378 rv = VFS_ROOT(mp, vpp);
379 if (rv)
380 return rv;
381
382 if (!lock)
383 VOP_UNLOCK(*vpp, 0);
384
385 return 0;
386 }
387
388 int
389 rump_vfs_statvfs(struct mount *mp, struct statvfs *sbp)
390 {
391
392 return VFS_STATVFS(mp, sbp);
393 }
394
395 int
396 rump_vfs_sync(struct mount *mp, int wait, kauth_cred_t cred)
397 {
398
399 return VFS_SYNC(mp, wait ? MNT_WAIT : MNT_NOWAIT, cred);
400 }
401
402 int
403 rump_vfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
404 {
405
406 return VFS_FHTOVP(mp, fid, vpp);
407 }
408
409 int
410 rump_vfs_vptofh(struct vnode *vp, struct fid *fid, size_t *fidsize)
411 {
412
413 return VFS_VPTOFH(vp, fid, fidsize);
414 }
415
416 /*ARGSUSED*/
417 void
418 rump_vfs_syncwait(struct mount *mp)
419 {
420 int n;
421
422 n = buf_syncwait();
423 if (n)
424 printf("syncwait: unsynced buffers: %d\n", n);
425 }
426
427 void
428 rump_biodone(void *arg, size_t count, int error)
429 {
430 struct buf *bp = arg;
431
432 bp->b_resid = bp->b_bcount - count;
433 KASSERT(bp->b_resid >= 0);
434 bp->b_error = error;
435
436 biodone(bp);
437 }
438
439 static void
440 rump_rcvp_lwpset(struct vnode *rvp, struct vnode *cvp, struct lwp *l)
441 {
442 struct cwdinfo *cwdi = l->l_proc->p_cwdi;
443
444 KASSERT(cvp);
445
446 rw_enter(&cwdi->cwdi_lock, RW_WRITER);
447 if (cwdi->cwdi_rdir)
448 vrele(cwdi->cwdi_rdir);
449 if (rvp)
450 vref(rvp);
451 cwdi->cwdi_rdir = rvp;
452
453 vrele(cwdi->cwdi_cdir);
454 vref(cvp);
455 cwdi->cwdi_cdir = cvp;
456 rw_exit(&cwdi->cwdi_lock);
457 }
458
459 void
460 rump_rcvp_set(struct vnode *rvp, struct vnode *cvp)
461 {
462
463 rump_rcvp_lwpset(rvp, cvp, curlwp);
464 }
465
466 struct vnode *
467 rump_cdir_get(void)
468 {
469 struct vnode *vp;
470 struct cwdinfo *cwdi = curlwp->l_proc->p_cwdi;
471
472 rw_enter(&cwdi->cwdi_lock, RW_READER);
473 vp = cwdi->cwdi_cdir;
474 rw_exit(&cwdi->cwdi_lock);
475 vref(vp);
476
477 return vp;
478 }
479