rump_vfs.c revision 1.30 1 /* $NetBSD: rump_vfs.c,v 1.30 2009/10/09 14:41:36 pooka 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 1.30 2009/10/09 14:41:36 pooka 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/lockf.h>
40 #include <sys/kthread.h>
41 #include <sys/module.h>
42 #include <sys/namei.h>
43 #include <sys/queue.h>
44 #include <sys/vfs_syscalls.h>
45 #include <sys/vnode.h>
46 #include <sys/wapbl.h>
47
48 #include <miscfs/specfs/specdev.h>
49 #include <miscfs/syncfs/syncfs.h>
50
51 #include <rump/rump.h>
52 #include <rump/rumpuser.h>
53
54 #include "rump_private.h"
55 #include "rump_vfs_private.h"
56
57 struct cwdinfo cwdi0;
58
59 static void rump_rcvp_lwpset(struct vnode *, struct vnode *, struct lwp *);
60
61 static void
62 pvfs_init(struct proc *p)
63 {
64
65 p->p_cwdi = cwdinit();
66 }
67
68 static void
69 pvfs_rele(struct proc *p)
70 {
71
72 cwdfree(p->p_cwdi);
73 }
74
75 void
76 rump_vfs_init(void)
77 {
78 char buf[64];
79 int error;
80 extern int dovfsusermount; /* XXX */
81
82 dovfsusermount = 1; /* XXX */
83
84 if (rumpuser_getenv("RUMP_NVNODES", buf, sizeof(buf), &error) == 0) {
85 desiredvnodes = strtoul(buf, NULL, 10);
86 } else {
87 desiredvnodes = 1<<16;
88 }
89
90 rumpblk_init();
91
92 cache_cpu_init(&rump_cpu);
93 vfsinit();
94 bufinit();
95 wapbl_init();
96 cwd_sys_init();
97 lf_init();
98
99 rumpuser_bioinit(rump_biodone);
100 rumpfs_init();
101
102 rump_proc_vfs_init = pvfs_init;
103 rump_proc_vfs_release = pvfs_rele;
104
105 /* bootstrap cwdi */
106 rw_init(&cwdi0.cwdi_lock);
107 cwdi0.cwdi_cdir = rootvnode;
108 vref(cwdi0.cwdi_cdir);
109 proc0.p_cwdi = &cwdi0;
110 proc0.p_cwdi = cwdinit();
111
112 if (rump_threads) {
113 int rv;
114
115 if ((rv = kthread_create(PRI_IOFLUSH, KTHREAD_MPSAFE, NULL,
116 sched_sync, NULL, NULL, "ioflush")) != 0)
117 panic("syncer thread create failed: %d", rv);
118 } else {
119 syncdelay = 0;
120 }
121 }
122
123 void
124 rump_vfs_fini(void)
125 {
126
127 vfs_shutdown();
128 }
129
130 struct componentname *
131 rump_makecn(u_long nameiop, u_long flags, const char *name, size_t namelen,
132 kauth_cred_t creds, struct lwp *l)
133 {
134 struct componentname *cnp;
135 const char *cp = NULL;
136
137 cnp = kmem_zalloc(sizeof(struct componentname), KM_SLEEP);
138
139 cnp->cn_nameiop = nameiop;
140 cnp->cn_flags = flags;
141
142 cnp->cn_pnbuf = PNBUF_GET();
143 strcpy(cnp->cn_pnbuf, name);
144 cnp->cn_nameptr = cnp->cn_pnbuf;
145 cnp->cn_namelen = namelen;
146 cnp->cn_hash = namei_hash(name, &cp);
147
148 cnp->cn_cred = creds;
149
150 return cnp;
151 }
152
153 void
154 rump_freecn(struct componentname *cnp, int flags)
155 {
156
157 if (flags & RUMPCN_FREECRED)
158 rump_cred_put(cnp->cn_cred);
159
160 if ((cnp->cn_flags & SAVENAME) == 0 || flags & RUMPCN_FORCEFREE)
161 PNBUF_PUT(cnp->cn_pnbuf);
162 kmem_free(cnp, sizeof(*cnp));
163 }
164
165 int
166 rump_checksavecn(struct componentname *cnp)
167 {
168
169 if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0) {
170 return 0;
171 } else {
172 cnp->cn_flags |= HASBUF;
173 return 1;
174 }
175 }
176
177 /* hey baby, what's your namei? */
178 int
179 rump_namei(uint32_t op, uint32_t flags, const char *namep,
180 struct vnode **dvpp, struct vnode **vpp, struct componentname **cnpp)
181 {
182 struct nameidata nd;
183 int rv;
184
185 NDINIT(&nd, op, flags, UIO_SYSSPACE, namep);
186 rv = namei(&nd);
187 if (rv)
188 return rv;
189
190 if (dvpp) {
191 KASSERT(flags & LOCKPARENT);
192 *dvpp = nd.ni_dvp;
193 } else {
194 KASSERT((flags & LOCKPARENT) == 0);
195 }
196
197 if (vpp) {
198 *vpp = nd.ni_vp;
199 } else {
200 if (nd.ni_vp) {
201 if (flags & LOCKLEAF)
202 vput(nd.ni_vp);
203 else
204 vrele(nd.ni_vp);
205 }
206 }
207
208 if (cnpp) {
209 struct componentname *cnp;
210
211 cnp = kmem_alloc(sizeof(*cnp), KM_SLEEP);
212 memcpy(cnp, &nd.ni_cnd, sizeof(*cnp));
213 *cnpp = cnp;
214 } else if (nd.ni_cnd.cn_flags & HASBUF) {
215 panic("%s: pathbuf mismatch", __func__);
216 }
217
218 return rv;
219 }
220
221 void
222 rump_getvninfo(struct vnode *vp, enum vtype *vtype, voff_t *vsize, dev_t *vdev)
223 {
224
225 *vtype = vp->v_type;
226 *vsize = vp->v_size;
227 if (vp->v_specnode)
228 *vdev = vp->v_rdev;
229 else
230 *vdev = 0;
231 }
232
233 struct vfsops *
234 rump_vfslist_iterate(struct vfsops *ops)
235 {
236
237 if (ops == NULL)
238 return LIST_FIRST(&vfs_list);
239 else
240 return LIST_NEXT(ops, vfs_list);
241 }
242
243 struct vfsops *
244 rump_vfs_getopsbyname(const char *name)
245 {
246
247 return vfs_getopsbyname(name);
248 }
249
250 int
251 rump_vfs_getmp(const char *path, struct mount **mpp)
252 {
253 struct vnode *vp;
254 int rv;
255
256 if ((rv = namei_simple_user(path, NSM_FOLLOW_TRYEMULROOT, &vp)) != 0)
257 return rv;
258
259 *mpp = vp->v_mount;
260 vrele(vp);
261 return 0;
262 }
263
264 struct vattr*
265 rump_vattr_init(void)
266 {
267 struct vattr *vap;
268
269 vap = kmem_alloc(sizeof(struct vattr), KM_SLEEP);
270 vattr_null(vap);
271
272 return vap;
273 }
274
275 void
276 rump_vattr_settype(struct vattr *vap, enum vtype vt)
277 {
278
279 vap->va_type = vt;
280 }
281
282 void
283 rump_vattr_setmode(struct vattr *vap, mode_t mode)
284 {
285
286 vap->va_mode = mode;
287 }
288
289 void
290 rump_vattr_setrdev(struct vattr *vap, dev_t dev)
291 {
292
293 vap->va_rdev = dev;
294 }
295
296 void
297 rump_vattr_free(struct vattr *vap)
298 {
299
300 kmem_free(vap, sizeof(*vap));
301 }
302
303 void
304 rump_vp_incref(struct vnode *vp)
305 {
306
307 vref(vp);
308 }
309
310 int
311 rump_vp_getref(struct vnode *vp)
312 {
313
314 return vp->v_usecount;
315 }
316
317 void
318 rump_vp_rele(struct vnode *vp)
319 {
320
321 vrele(vp);
322 }
323
324 void
325 rump_vp_interlock(struct vnode *vp)
326 {
327
328 mutex_enter(&vp->v_interlock);
329 }
330
331 int
332 rump_vfs_unmount(struct mount *mp, int mntflags)
333 {
334 #if 0
335 struct evcnt *ev;
336
337 printf("event counters:\n");
338 TAILQ_FOREACH(ev, &allevents, ev_list)
339 printf("%s: %llu\n", ev->ev_name, ev->ev_count);
340 #endif
341
342 return VFS_UNMOUNT(mp, mntflags);
343 }
344
345 int
346 rump_vfs_root(struct mount *mp, struct vnode **vpp, int lock)
347 {
348 int rv;
349
350 rv = VFS_ROOT(mp, vpp);
351 if (rv)
352 return rv;
353
354 if (!lock)
355 VOP_UNLOCK(*vpp, 0);
356
357 return 0;
358 }
359
360 int
361 rump_vfs_statvfs(struct mount *mp, struct statvfs *sbp)
362 {
363
364 return VFS_STATVFS(mp, sbp);
365 }
366
367 int
368 rump_vfs_sync(struct mount *mp, int wait, kauth_cred_t cred)
369 {
370
371 return VFS_SYNC(mp, wait ? MNT_WAIT : MNT_NOWAIT, cred);
372 }
373
374 int
375 rump_vfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
376 {
377
378 return VFS_FHTOVP(mp, fid, vpp);
379 }
380
381 int
382 rump_vfs_vptofh(struct vnode *vp, struct fid *fid, size_t *fidsize)
383 {
384
385 return VFS_VPTOFH(vp, fid, fidsize);
386 }
387
388 /*ARGSUSED*/
389 void
390 rump_vfs_syncwait(struct mount *mp)
391 {
392 int n;
393
394 n = buf_syncwait();
395 if (n)
396 printf("syncwait: unsynced buffers: %d\n", n);
397 }
398
399 void
400 rump_biodone(void *arg, size_t count, int error)
401 {
402 struct buf *bp = arg;
403
404 bp->b_resid = bp->b_bcount - count;
405 KASSERT(bp->b_resid >= 0);
406 bp->b_error = error;
407
408 biodone(bp);
409 }
410
411 static void
412 rump_rcvp_lwpset(struct vnode *rvp, struct vnode *cvp, struct lwp *l)
413 {
414 struct cwdinfo *cwdi = l->l_proc->p_cwdi;
415
416 KASSERT(cvp);
417
418 rw_enter(&cwdi->cwdi_lock, RW_WRITER);
419 if (cwdi->cwdi_rdir)
420 vrele(cwdi->cwdi_rdir);
421 if (rvp)
422 vref(rvp);
423 cwdi->cwdi_rdir = rvp;
424
425 vrele(cwdi->cwdi_cdir);
426 vref(cvp);
427 cwdi->cwdi_cdir = cvp;
428 rw_exit(&cwdi->cwdi_lock);
429 }
430
431 void
432 rump_rcvp_set(struct vnode *rvp, struct vnode *cvp)
433 {
434
435 rump_rcvp_lwpset(rvp, cvp, curlwp);
436 }
437
438 struct vnode *
439 rump_cdir_get(void)
440 {
441 struct vnode *vp;
442 struct cwdinfo *cwdi = curlwp->l_proc->p_cwdi;
443
444 rw_enter(&cwdi->cwdi_lock, RW_READER);
445 vp = cwdi->cwdi_cdir;
446 rw_exit(&cwdi->cwdi_lock);
447 vref(vp);
448
449 return vp;
450 }
451