1/* $NetBSD: puffs_vfsops.c,v 1.118 2015/12/20 01:34:00 christos Exp $ */
2
3/*
4 * Copyright (c) 2005, 2006 Antti Kantee. All Rights Reserved.
5 *
6 * Development of this software was supported by the
7 * Google Summer of Code program and the Ulla Tuominen Foundation.
8 * The Google SoC project was mentored by Bill Studenmund.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
20 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: puffs_vfsops.c,v 1.118 2015/12/20 01:34:00 christos Exp $");
34
35#include <sys/param.h>
36#include <sys/kernel.h>
37#include <sys/mount.h>
38#include <sys/extattr.h>
39#include <sys/queue.h>
40#include <sys/vnode.h>
41#include <sys/dirent.h>
42#include <sys/kauth.h>
43#include <sys/proc.h>
44#include <sys/module.h>
45#include <sys/kthread.h>
46
47#include <uvm/uvm.h>
48
49#include <dev/putter/putter_sys.h>
50
51#include <miscfs/genfs/genfs.h>
52
53#include <fs/puffs/puffs_msgif.h>
54#include <fs/puffs/puffs_sys.h>
55
56#include <lib/libkern/libkern.h>
57
58#include <nfs/nfsproto.h> /* for fh sizes */
59
60MODULE(MODULE_CLASS_VFS, puffs, "putter");
61
62VFS_PROTOS(puffs_vfsop);
63
64static struct putter_ops puffs_putter = {
65 .pop_getout = puffs_msgif_getout,
66 .pop_releaseout = puffs_msgif_releaseout,
67 .pop_waitcount = puffs_msgif_waitcount,
68 .pop_dispatch = puffs_msgif_dispatch,
69 .pop_close = puffs_msgif_close,
70};
71
72static const struct genfs_ops puffs_genfsops = {
73 .gop_size = puffs_gop_size,
74 .gop_write = genfs_gop_write,
75 .gop_markupdate = puffs_gop_markupdate,
76#if 0
77 .gop_alloc, should ask userspace
78#endif
79};
80
81/*
82 * Try to ensure data structures used by the puffs protocol
83 * do not unexpectedly change.
84 */
85#if defined(__i386__) && defined(__ELF__)
86CTASSERT(sizeof(struct puffs_kargs) == 3928);
87CTASSERT(sizeof(struct vattr) == 136);
88CTASSERT(sizeof(struct puffs_req) == 44);
89#endif
90
91int
92puffs_vfsop_mount(struct mount *mp, const char *path, void *data,
93 size_t *data_len)
94{
95 struct puffs_mount *pmp = NULL;
96 struct puffs_kargs *args;
97 char fstype[_VFS_NAMELEN];
98 char *p;
99 int error = 0, i;
100 pid_t mntpid = curlwp->l_proc->p_pid;
101
102 if (data == NULL)
103 return EINVAL;
104 if (*data_len < sizeof *args)
105 return EINVAL;
106
107 if (mp->mnt_flag & MNT_GETARGS) {
108 pmp = MPTOPUFFSMP(mp);
109 *(struct puffs_kargs *)data = pmp->pmp_args;
110 *data_len = sizeof *args;
111 return 0;
112 }
113
114 /* update is not supported currently */
115 if (mp->mnt_flag & MNT_UPDATE)
116 return EOPNOTSUPP;
117
118 args = (struct puffs_kargs *)data;
119
120 if (args->pa_vers != PUFFSVERSION) {
121 printf("puffs_mount: development version mismatch: "
122 "kernel %d, lib %d\n", PUFFSVERSION, args->pa_vers);
123 error = EINVAL;
124 goto out;
125 }
126
127 if ((args->pa_flags & ~PUFFS_KFLAG_MASK) != 0) {
128 printf("puffs_mount: invalid KFLAGs 0x%x\n", args->pa_flags);
129 error = EINVAL;
130 goto out;
131 }
132 if ((args->pa_fhflags & ~PUFFS_FHFLAG_MASK) != 0) {
133 printf("puffs_mount: invalid FHFLAGs 0x%x\n", args->pa_fhflags);
134 error = EINVAL;
135 goto out;
136 }
137
138 for (i = 0; i < __arraycount(args->pa_spare); i++) {
139 if (args->pa_spare[i] != 0) {
140 printf("puffs_mount: pa_spare[%d] = 0x%x\n",
141 i, args->pa_spare[i]);
142 error = EINVAL;
143 goto out;
144 }
145 }
146
147 /* use dummy value for passthrough */
148 if (args->pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH)
149 args->pa_fhsize = sizeof(struct fid);
150
151 /* sanitize file handle length */
152 if (PUFFS_TOFHSIZE(args->pa_fhsize) > FHANDLE_SIZE_MAX) {
153 printf("puffs_mount: handle size %zu too large\n",
154 args->pa_fhsize);
155 error = EINVAL;
156 goto out;
157 }
158 /* sanity check file handle max sizes */
159 if (args->pa_fhsize && args->pa_fhflags & PUFFS_FHFLAG_PROTOMASK) {
160 size_t kfhsize = PUFFS_TOFHSIZE(args->pa_fhsize);
161
162 if (args->pa_fhflags & PUFFS_FHFLAG_NFSV2) {
163 if (NFSX_FHTOOBIG_P(kfhsize, 0)) {
164 printf("puffs_mount: fhsize larger than "
165 "NFSv2 max %d\n",
166 PUFFS_FROMFHSIZE(NFSX_V2FH));
167 error = EINVAL;
168 goto out;
169 }
170 }
171
172 if (args->pa_fhflags & PUFFS_FHFLAG_NFSV3) {
173 if (NFSX_FHTOOBIG_P(kfhsize, 1)) {
174 printf("puffs_mount: fhsize larger than "
175 "NFSv3 max %d\n",
176 PUFFS_FROMFHSIZE(NFSX_V3FHMAX));
177 error = EINVAL;
178 goto out;
179 }
180 }
181 }
182
183 /* don't allow non-printing characters (like my sweet umlauts.. snif) */
184 args->pa_typename[sizeof(args->pa_typename)-1] = '\0';
185 for (p = args->pa_typename; *p; p++)
186 if (*p < ' ' || *p > '~')
187 *p = '.';
188
189 args->pa_mntfromname[sizeof(args->pa_mntfromname)-1] = '\0';
190 for (p = args->pa_mntfromname; *p; p++)
191 if (*p < ' ' || *p > '~')
192 *p = '.';
193
194 /* build real name */
195 (void)strlcpy(fstype, PUFFS_TYPEPREFIX, sizeof(fstype));
196 (void)strlcat(fstype, args->pa_typename, sizeof(fstype));
197
198 /* inform user server if it got the max request size it wanted */
199 if (args->pa_maxmsglen == 0 || args->pa_maxmsglen > PUFFS_MSG_MAXSIZE)
200 args->pa_maxmsglen = PUFFS_MSG_MAXSIZE;
201 else if (args->pa_maxmsglen < 2*PUFFS_MSGSTRUCT_MAX)
202 args->pa_maxmsglen = 2*PUFFS_MSGSTRUCT_MAX;
203
204 (void)strlcpy(args->pa_typename, fstype, sizeof(args->pa_typename));
205
206 error = set_statvfs_info(path, UIO_USERSPACE, args->pa_mntfromname,
207 UIO_SYSSPACE, fstype, mp, curlwp);
208 if (error)
209 goto out;
210 mp->mnt_stat.f_iosize = DEV_BSIZE;
211 mp->mnt_stat.f_namemax = args->pa_svfsb.f_namemax;
212
213 /*
214 * We can't handle the VFS_STATVFS() mount_domount() does
215 * after VFS_MOUNT() because we'd deadlock, so handle it
216 * here already.
217 */
218 copy_statvfs_info(&args->pa_svfsb, mp);
219 (void)memcpy(&mp->mnt_stat, &args->pa_svfsb, sizeof(mp->mnt_stat));
220
221 KASSERT(curlwp != uvm.pagedaemon_lwp);
222 pmp = kmem_zalloc(sizeof(struct puffs_mount), KM_SLEEP);
223
224 mp->mnt_fs_bshift = DEV_BSHIFT;
225 mp->mnt_dev_bshift = DEV_BSHIFT;
226 mp->mnt_flag &= ~MNT_LOCAL; /* we don't really know, so ... */
227 mp->mnt_data = pmp;
228
229#if 0
230 /*
231 * XXX: puffs code is MPSAFE. However, VFS really isn't.
232 * Currently, there is nothing which protects an inode from
233 * reclaim while there are threads inside the file system.
234 * This means that in the event of a server crash, an MPSAFE
235 * mount is likely to end up accessing invalid memory. For the
236 * non-mpsafe case, the kernel lock, general structure of
237 * puffs and pmp_refcount protect the threads during escape.
238 *
239 * Fixing this will require:
240 * a) fixing vfs
241 * OR
242 * b) adding a small sleep to puffs_msgif_close() between
243 * userdead() and dounmount().
244 * (well, this isn't really a fix, but would solve
245 * 99.999% of the race conditions).
246 *
247 * Also, in the event of "b", unmount -f should be used,
248 * like with any other file system, sparingly and only when
249 * it is "known" to be safe.
250 */
251 mp->mnt_iflags |= IMNT_MPSAFE;
252#endif
253
254 pmp->pmp_status = PUFFSTAT_MOUNTING;
255 pmp->pmp_mp = mp;
256 pmp->pmp_msg_maxsize = args->pa_maxmsglen;
257 pmp->pmp_args = *args;
258
259 /*
260 * Inform the fileops processing code that we have a mountpoint.
261 * If it doesn't know about anyone with our pid/fd having the
262 * device open, punt
263 */
264 if ((pmp->pmp_pi
265 = putter_attach(mntpid, args->pa_fd, pmp, &puffs_putter)) == NULL) {
266 error = ENOENT;
267 goto out;
268 }
269
270 /* XXX: check parameters */
271 pmp->pmp_root_cookie = args->pa_root_cookie;
272 switch (args->pa_root_vtype) {
273 case VNON: case VREG: case VDIR: case VBLK:
274 case VCHR: case VLNK: case VSOCK: case VFIFO:
275 break;
276 default:
277 error = EINVAL;
278 goto out;
279 }
280 pmp->pmp_root_vtype = args->pa_root_vtype;
281
282 if (args->pa_root_vsize < 0) {
283 error = EINVAL;
284 goto out;
285 }
286 pmp->pmp_root_vsize = args->pa_root_vsize;
287
288 pmp->pmp_root_rdev = args->pa_root_rdev;
289 pmp->pmp_docompat = args->pa_time32;
290
291 mutex_init(&pmp->pmp_lock, MUTEX_DEFAULT, IPL_NONE);
292 mutex_init(&pmp->pmp_sopmtx, MUTEX_DEFAULT, IPL_NONE);
293 cv_init(&pmp->pmp_msg_waiter_cv, "puffsget");
294 cv_init(&pmp->pmp_refcount_cv, "puffsref");
295 cv_init(&pmp->pmp_unmounting_cv, "puffsum");
296 cv_init(&pmp->pmp_sopcv, "puffsop");
297 TAILQ_INIT(&pmp->pmp_msg_touser);
298 TAILQ_INIT(&pmp->pmp_msg_replywait);
299 TAILQ_INIT(&pmp->pmp_sopfastreqs);
300 TAILQ_INIT(&pmp->pmp_sopnodereqs);
301
302 if ((error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
303 puffs_sop_thread, pmp, NULL, "puffsop")) != 0)
304 goto out;
305 pmp->pmp_sopthrcount = 1;
306
307 DPRINTF(("puffs_mount: mount point at %p, puffs specific at %p\n",
308 mp, MPTOPUFFSMP(mp)));
309
310 vfs_getnewfsid(mp);
311
312 out:
313 if (error && pmp && pmp->pmp_pi)
314 putter_detach(pmp->pmp_pi);
315 if (error && pmp)
316 kmem_free(pmp, sizeof(struct puffs_mount));
317 return error;
318}
319
320int
321puffs_vfsop_start(struct mount *mp, int flags)
322{
323 struct puffs_mount *pmp = MPTOPUFFSMP(mp);
324
325 KASSERT(pmp->pmp_status == PUFFSTAT_MOUNTING);
326 pmp->pmp_status = PUFFSTAT_RUNNING;
327
328 return 0;
329}
330
331int
332puffs_vfsop_unmount(struct mount *mp, int mntflags)
333{
334 PUFFS_MSG_VARS(vfs, unmount);
335 struct puffs_mount *pmp;
336 int error, force;
337
338 error = 0;
339 force = mntflags & MNT_FORCE;
340 pmp = MPTOPUFFSMP(mp);
341
342 DPRINTF(("puffs_unmount: detach filesystem from vfs, current "
343 "status 0x%x\n", pmp->pmp_status));
344
345 /*
346 * flush all the vnodes. VOP_RECLAIM() takes care that the
347 * root vnode does not get flushed until unmount. The
348 * userspace root node cookie is stored in the mount
349 * structure, so we can always re-instantiate a root vnode,
350 * should userspace unmount decide it doesn't want to
351 * cooperate.
352 */
353 error = vflush(mp, NULLVP, force ? FORCECLOSE : 0);
354 if (error)
355 goto out;
356
357 /*
358 * If we are not DYING, we should ask userspace's opinion
359 * about the situation
360 */
361 mutex_enter(&pmp->pmp_lock);
362 if (pmp->pmp_status != PUFFSTAT_DYING) {
363 pmp->pmp_unmounting = 1;
364 mutex_exit(&pmp->pmp_lock);
365
366 PUFFS_MSG_ALLOC(vfs, unmount);
367 puffs_msg_setinfo(park_unmount,
368 PUFFSOP_VFS, PUFFS_VFS_UNMOUNT, NULL);
369 unmount_msg->pvfsr_flags = mntflags;
370
371 PUFFS_MSG_ENQUEUEWAIT(pmp, park_unmount, error);
372 PUFFS_MSG_RELEASE(unmount);
373
374 error = checkerr(pmp, error, __func__);
375 DPRINTF(("puffs_unmount: error %d force %d\n", error, force));
376
377 mutex_enter(&pmp->pmp_lock);
378 pmp->pmp_unmounting = 0;
379 cv_broadcast(&pmp->pmp_unmounting_cv);
380 }
381
382 /*
383 * if userspace cooperated or we really need to die,
384 * screw what userland thinks and just die.
385 */
386 if (error == 0 || force) {
387 struct puffs_sopreq *psopr;
388
389 /* tell waiters & other resources to go unwait themselves */
390 puffs_userdead(pmp);
391 putter_detach(pmp->pmp_pi);
392
393 /*
394 * Wait until there are no more users for the mount resource.
395 * Notice that this is hooked against transport_close
396 * and return from touser. In an ideal world, it would
397 * be hooked against final return from all operations.
398 * But currently it works well enough, since nobody
399 * does weird blocking voodoo after return from touser().
400 */
401 while (pmp->pmp_refcount != 0)
402 cv_wait(&pmp->pmp_refcount_cv, &pmp->pmp_lock);
403 mutex_exit(&pmp->pmp_lock);
404
405 /*
406 * Release kernel thread now that there is nothing
407 * it would be wanting to lock.
408 */
409 KASSERT(curlwp != uvm.pagedaemon_lwp);
410 psopr = kmem_alloc(sizeof(*psopr), KM_SLEEP);
411 psopr->psopr_sopreq = PUFFS_SOPREQSYS_EXIT;
412 mutex_enter(&pmp->pmp_sopmtx);
413 if (pmp->pmp_sopthrcount == 0) {
414 mutex_exit(&pmp->pmp_sopmtx);
415 kmem_free(psopr, sizeof(*psopr));
416 mutex_enter(&pmp->pmp_sopmtx);
417 KASSERT(pmp->pmp_sopthrcount == 0);
418 } else {
419 TAILQ_INSERT_TAIL(&pmp->pmp_sopfastreqs,
420 psopr, psopr_entries);
421 cv_signal(&pmp->pmp_sopcv);
422 }
423 while (pmp->pmp_sopthrcount > 0)
424 cv_wait(&pmp->pmp_sopcv, &pmp->pmp_sopmtx);
425 mutex_exit(&pmp->pmp_sopmtx);
426
427 /* free resources now that we hopefully have no waiters left */
428 cv_destroy(&pmp->pmp_unmounting_cv);
429 cv_destroy(&pmp->pmp_refcount_cv);
430 cv_destroy(&pmp->pmp_msg_waiter_cv);
431 cv_destroy(&pmp->pmp_sopcv);
432 mutex_destroy(&pmp->pmp_lock);
433 mutex_destroy(&pmp->pmp_sopmtx);
434
435 kmem_free(pmp, sizeof(struct puffs_mount));
436 error = 0;
437 } else {
438 mutex_exit(&pmp->pmp_lock);
439 }
440
441 out:
442 DPRINTF(("puffs_unmount: return %d\n", error));
443 return error;
444}
445
446/*
447 * This doesn't need to travel to userspace
448 */
449int
450puffs_vfsop_root(struct mount *mp, struct vnode **vpp)
451{
452 struct puffs_mount *pmp = MPTOPUFFSMP(mp);
453 int rv;
454
455 rv = puffs_cookie2vnode(pmp, pmp->pmp_root_cookie, vpp);
456 KASSERT(rv != PUFFS_NOSUCHCOOKIE);
457 if (rv != 0)
458 return rv;
459 rv = vn_lock(*vpp, LK_EXCLUSIVE);
460 if (rv != 0) {
461 vrele(*vpp);
462 *vpp = NULL;
463 return rv;
464 }
465 return 0;
466}
467
468int
469puffs_vfsop_statvfs(struct mount *mp, struct statvfs *sbp)
470{
471 PUFFS_MSG_VARS(vfs, statvfs);
472 struct puffs_mount *pmp;
473 int error = 0;
474
475 pmp = MPTOPUFFSMP(mp);
476
477 /*
478 * If we are mounting, it means that the userspace counterpart
479 * is calling mount(2), but mount(2) also calls statvfs. So
480 * requesting statvfs from userspace would mean a deadlock.
481 * Compensate.
482 */
483 if (__predict_false(pmp->pmp_status == PUFFSTAT_MOUNTING))
484 return EINPROGRESS;
485
486 PUFFS_MSG_ALLOC(vfs, statvfs);
487 puffs_msg_setinfo(park_statvfs, PUFFSOP_VFS, PUFFS_VFS_STATVFS, NULL);
488
489 PUFFS_MSG_ENQUEUEWAIT(pmp, park_statvfs, error);
490 error = checkerr(pmp, error, __func__);
491 statvfs_msg->pvfsr_sb.f_iosize = DEV_BSIZE;
492
493 /*
494 * Try to produce a sensible result even in the event
495 * of userspace error.
496 *
497 * XXX: cache the copy in non-error case
498 */
499 if (!error) {
500 copy_statvfs_info(&statvfs_msg->pvfsr_sb, mp);
501 (void)memcpy(sbp, &statvfs_msg->pvfsr_sb,
502 sizeof(struct statvfs));
503 } else {
504 copy_statvfs_info(sbp, mp);
505 }
506
507 PUFFS_MSG_RELEASE(statvfs);
508 return error;
509}
510
511static bool
512pageflush_selector(void *cl, struct vnode *vp)
513{
514 return vp->v_type == VREG &&
515 !(LIST_EMPTY(&vp->v_dirtyblkhd) && UVM_OBJ_IS_CLEAN(&vp->v_uobj));
516}
517
518static int
519pageflush(struct mount *mp, kauth_cred_t cred, int waitfor)
520{
521 struct puffs_node *pn;
522 struct vnode *vp;
523 struct vnode_iterator *marker;
524 int error, rv, fsyncwait;
525
526 error = 0;
527 fsyncwait = (waitfor == MNT_WAIT) ? FSYNC_WAIT : 0;
528
529 /*
530 * Sync all cached data from regular vnodes (which are not
531 * currently locked, see below). After this we call VFS_SYNC
532 * for the fs server, which should handle data and metadata for
533 * all the nodes it knows to exist.
534 */
535 vfs_vnode_iterator_init(mp, &marker);
536 while ((vp = vfs_vnode_iterator_next(marker, pageflush_selector,
537 NULL)))
538 {
539 /*
540 * Here we try to get a reference to the vnode and to
541 * lock it. This is mostly cargo-culted, but I will
542 * offer an explanation to why I believe this might
543 * actually do the right thing.
544 *
545 * If the vnode is a goner, we quite obviously don't need
546 * to sync it.
547 *
548 * If the vnode was busy, we don't need to sync it because
549 * this is never called with MNT_WAIT except from
550 * dounmount(), when we are wait-flushing all the dirty
551 * vnodes through other routes in any case. So there,
552 * sync() doesn't actually sync. Happy now?
553 */
554 error = vn_lock(vp, LK_EXCLUSIVE | LK_NOWAIT);
555 if (error) {
556 vrele(vp);
557 continue;
558 }
559 pn = VPTOPP(vp);
560 /* hmm.. is the FAF thing entirely sensible? */
561 if (waitfor == MNT_LAZY) {
562 mutex_enter(vp->v_interlock);
563 pn->pn_stat |= PNODE_FAF;
564 mutex_exit(vp->v_interlock);
565 }
566 rv = VOP_FSYNC(vp, cred, fsyncwait, 0, 0);
567 if (waitfor == MNT_LAZY) {
568 mutex_enter(vp->v_interlock);
569 pn->pn_stat &= ~PNODE_FAF;
570 mutex_exit(vp->v_interlock);
571 }
572 if (rv)
573 error = rv;
574 vput(vp);
575 }
576 vfs_vnode_iterator_destroy(marker);
577
578 return error;
579}
580
581int
582puffs_vfsop_sync(struct mount *mp, int waitfor, struct kauth_cred *cred)
583{
584 PUFFS_MSG_VARS(vfs, sync);
585 struct puffs_mount *pmp = MPTOPUFFSMP(mp);
586 int error, rv;
587
588 error = pageflush(mp, cred, waitfor);
589
590 /* sync fs */
591 PUFFS_MSG_ALLOC(vfs, sync);
592 sync_msg->pvfsr_waitfor = waitfor;
593 puffs_credcvt(&sync_msg->pvfsr_cred, cred);
594 puffs_msg_setinfo(park_sync, PUFFSOP_VFS, PUFFS_VFS_SYNC, NULL);
595
596 PUFFS_MSG_ENQUEUEWAIT(pmp, park_sync, rv);
597 rv = checkerr(pmp, rv, __func__);
598 if (rv)
599 error = rv;
600
601 PUFFS_MSG_RELEASE(sync);
602 return error;
603}
604
605int
606puffs_vfsop_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
607{
608 PUFFS_MSG_VARS(vfs, fhtonode);
609 struct puffs_mount *pmp = MPTOPUFFSMP(mp);
610 struct vnode *vp;
611 void *fhdata;
612 size_t argsize, fhlen;
613 int error;
614
615 if (pmp->pmp_args.pa_fhsize == 0)
616 return EOPNOTSUPP;
617
618 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) {
619 fhlen = fhp->fid_len;
620 fhdata = fhp;
621 } else {
622 fhlen = PUFFS_FROMFHSIZE(fhp->fid_len);
623 fhdata = fhp->fid_data;
624
625 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_DYNAMIC) {
626 if (pmp->pmp_args.pa_fhsize < fhlen)
627 return EINVAL;
628 } else {
629 if (pmp->pmp_args.pa_fhsize != fhlen)
630 return EINVAL;
631 }
632 }
633
634 argsize = sizeof(struct puffs_vfsmsg_fhtonode) + fhlen;
635 puffs_msgmem_alloc(argsize, &park_fhtonode, (void *)&fhtonode_msg, 1);
636 fhtonode_msg->pvfsr_dsize = fhlen;
637 memcpy(fhtonode_msg->pvfsr_data, fhdata, fhlen);
638 puffs_msg_setinfo(park_fhtonode, PUFFSOP_VFS, PUFFS_VFS_FHTOVP, NULL);
639
640 PUFFS_MSG_ENQUEUEWAIT(pmp, park_fhtonode, error);
641 error = checkerr(pmp, error, __func__);
642 if (error)
643 goto out;
644
645 error = puffs_getvnode(mp, fhtonode_msg->pvfsr_fhcookie,
646 fhtonode_msg->pvfsr_vtype, fhtonode_msg->pvfsr_size,
647 fhtonode_msg->pvfsr_rdev, &vp);
648 if (error)
649 goto out;
650 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
651
652 *vpp = vp;
653 out:
654 puffs_msgmem_release(park_fhtonode);
655 return error;
656}
657
658int
659puffs_vfsop_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
660{
661 PUFFS_MSG_VARS(vfs, nodetofh);
662 struct puffs_mount *pmp = MPTOPUFFSMP(vp->v_mount);
663 size_t argsize, fhlen;
664 int error;
665
666 if (pmp->pmp_args.pa_fhsize == 0)
667 return EOPNOTSUPP;
668
669 /* if file handles are static len, we can test len immediately */
670 if (((pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_DYNAMIC) == 0)
671 && ((pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) == 0)
672 && (PUFFS_FROMFHSIZE(*fh_size) < pmp->pmp_args.pa_fhsize)) {
673 *fh_size = PUFFS_TOFHSIZE(pmp->pmp_args.pa_fhsize);
674 return E2BIG;
675 }
676
677 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH)
678 fhlen = *fh_size;
679 else
680 fhlen = PUFFS_FROMFHSIZE(*fh_size);
681
682 argsize = sizeof(struct puffs_vfsmsg_nodetofh) + fhlen;
683 puffs_msgmem_alloc(argsize, &park_nodetofh, (void *)&nodetofh_msg, 1);
684 nodetofh_msg->pvfsr_fhcookie = VPTOPNC(vp);
685 nodetofh_msg->pvfsr_dsize = fhlen;
686 puffs_msg_setinfo(park_nodetofh, PUFFSOP_VFS, PUFFS_VFS_VPTOFH, NULL);
687
688 PUFFS_MSG_ENQUEUEWAIT(pmp, park_nodetofh, error);
689 error = checkerr(pmp, error, __func__);
690
691 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH)
692 fhlen = nodetofh_msg->pvfsr_dsize;
693 else if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_DYNAMIC)
694 fhlen = PUFFS_TOFHSIZE(nodetofh_msg->pvfsr_dsize);
695 else
696 fhlen = PUFFS_TOFHSIZE(pmp->pmp_args.pa_fhsize);
697
698 if (error) {
699 if (error == E2BIG)
700 *fh_size = fhlen;
701 goto out;
702 }
703
704 if (fhlen > FHANDLE_SIZE_MAX) {
705 puffs_senderr(pmp, PUFFS_ERR_VPTOFH, E2BIG,
706 "file handle too big", VPTOPNC(vp));
707 error = EPROTO;
708 goto out;
709 }
710
711 if (*fh_size < fhlen) {
712 *fh_size = fhlen;
713 error = E2BIG;
714 goto out;
715 }
716 *fh_size = fhlen;
717
718 if (fhp) {
719 if (pmp->pmp_args.pa_fhflags & PUFFS_FHFLAG_PASSTHROUGH) {
720 memcpy(fhp, nodetofh_msg->pvfsr_data, fhlen);
721 } else {
722 fhp->fid_len = *fh_size;
723 memcpy(fhp->fid_data, nodetofh_msg->pvfsr_data,
724 nodetofh_msg->pvfsr_dsize);
725 }
726 }
727
728 out:
729 puffs_msgmem_release(park_nodetofh);
730 return error;
731}
732
733int
734puffs_vfsop_loadvnode(struct mount *mp, struct vnode *vp,
735 const void *key, size_t key_len, const void **new_key)
736{
737 struct puffs_mount *pmp;
738 struct puffs_node *pnode;
739
740 KASSERT(key_len == sizeof(puffs_cookie_t));
741
742 pmp = MPTOPUFFSMP(mp);
743
744 /* Allocate and initialize the pnode. */
745 pnode = pool_get(&puffs_pnpool, PR_WAITOK);
746 memset(pnode, 0, sizeof(struct puffs_node));
747
748 pnode->pn_vp = vp;
749 memcpy(&pnode->pn_cookie, key, key_len);
750 pnode->pn_refcount = 1;
751 mutex_init(&pnode->pn_mtx, MUTEX_DEFAULT, IPL_NONE);
752 mutex_init(&pnode->pn_sizemtx, MUTEX_DEFAULT, IPL_NONE);
753 selinit(&pnode->pn_sel);
754 vp->v_tag = VT_PUFFS;
755 vp->v_type = VNON;
756 vp->v_op = puffs_vnodeop_p;
757 if (pnode->pn_cookie == pmp->pmp_root_cookie)
758 vp->v_vflag |= VV_ROOT;
759 vp->v_data = pnode;
760
761 genfs_node_init(vp, &puffs_genfsops);
762 uvm_vnp_setsize(vp, 0);
763
764 *new_key = &pnode->pn_cookie;
765 return 0;
766}
767
768void
769puffs_vfsop_init(void)
770{
771
772 /* some checks depend on this */
773 KASSERT(VNOVAL == VSIZENOTSET);
774
775 pool_init(&puffs_pnpool, sizeof(struct puffs_node), 0, 0, 0,
776 "puffpnpl", &pool_allocator_nointr, IPL_NONE);
777 pool_init(&puffs_vapool, sizeof(struct vattr), 0, 0, 0,
778 "puffvapl", &pool_allocator_nointr, IPL_NONE);
779 puffs_msgif_init();
780}
781
782void
783puffs_vfsop_done(void)
784{
785
786 puffs_msgif_destroy();
787 pool_destroy(&puffs_pnpool);
788 pool_destroy(&puffs_vapool);
789}
790
791int
792puffs_vfsop_snapshot(struct mount *mp, struct vnode *vp, struct timespec *ts)
793{
794
795 return EOPNOTSUPP;
796}
797
798int
799puffs_vfsop_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
800 int attrnamespace, const char *attrname)
801{
802 PUFFS_MSG_VARS(vfs, extattrctl);
803 struct puffs_mount *pmp = MPTOPUFFSMP(mp);
804 struct puffs_node *pnp;
805 puffs_cookie_t pnc;
806 int error, flags;
807
808 if (vp) {
809 /* doesn't make sense for puffs servers */
810 if (vp->v_mount != mp)
811 return EXDEV;
812 pnp = vp->v_data;
813 pnc = pnp->pn_cookie;
814 flags = PUFFS_EXTATTRCTL_HASNODE;
815 } else {
816 pnp = pnc = NULL;
817 flags = 0;
818 }
819
820 PUFFS_MSG_ALLOC(vfs, extattrctl);
821 extattrctl_msg->pvfsr_cmd = cmd;
822 extattrctl_msg->pvfsr_attrnamespace = attrnamespace;
823 extattrctl_msg->pvfsr_flags = flags;
824 if (attrname) {
825 strlcpy(extattrctl_msg->pvfsr_attrname, attrname,
826 sizeof(extattrctl_msg->pvfsr_attrname));
827 extattrctl_msg->pvfsr_flags |= PUFFS_EXTATTRCTL_HASATTRNAME;
828 }
829 puffs_msg_setinfo(park_extattrctl,
830 PUFFSOP_VFS, PUFFS_VFS_EXTATTRCTL, pnc);
831
832 puffs_msg_enqueue(pmp, park_extattrctl);
833 if (vp) {
834 mutex_enter(&pnp->pn_mtx);
835 puffs_referencenode(pnp);
836 mutex_exit(&pnp->pn_mtx);
837 VOP_UNLOCK(vp);
838 }
839 error = puffs_msg_wait2(pmp, park_extattrctl, pnp, NULL);
840 PUFFS_MSG_RELEASE(extattrctl);
841 if (vp) {
842 puffs_releasenode(pnp);
843 }
844
845 return checkerr(pmp, error, __func__);
846}
847
848const struct vnodeopv_desc * const puffs_vnodeopv_descs[] = {
849 &puffs_vnodeop_opv_desc,
850 &puffs_specop_opv_desc,
851 &puffs_fifoop_opv_desc,
852 &puffs_msgop_opv_desc,
853 NULL,
854};
855
856struct vfsops puffs_vfsops = {
857 .vfs_name = MOUNT_PUFFS,
858 .vfs_min_mount_data = sizeof (struct puffs_kargs),
859 .vfs_mount = puffs_vfsop_mount,
860 .vfs_start = puffs_vfsop_start,
861 .vfs_unmount = puffs_vfsop_unmount,
862 .vfs_root = puffs_vfsop_root,
863 .vfs_quotactl = (void *)eopnotsupp,
864 .vfs_statvfs = puffs_vfsop_statvfs,
865 .vfs_sync = puffs_vfsop_sync,
866 .vfs_vget = (void *)eopnotsupp,
867 .vfs_loadvnode = puffs_vfsop_loadvnode,
868 .vfs_fhtovp = puffs_vfsop_fhtovp,
869 .vfs_vptofh = puffs_vfsop_vptofh,
870 .vfs_init = puffs_vfsop_init,
871 .vfs_done = puffs_vfsop_done,
872 .vfs_snapshot = puffs_vfsop_snapshot,
873 .vfs_extattrctl = puffs_vfsop_extattrctl,
874 .vfs_suspendctl = (void *)eopnotsupp,
875 .vfs_renamelock_enter = genfs_renamelock_enter,
876 .vfs_renamelock_exit = genfs_renamelock_exit,
877 .vfs_fsync = (void *)eopnotsupp,
878 .vfs_opv_descs = puffs_vnodeopv_descs
879};
880
881static int
882puffs_modcmd(modcmd_t cmd, void *arg)
883{
884
885 switch (cmd) {
886 case MODULE_CMD_INIT:
887 return vfs_attach(&puffs_vfsops);
888 case MODULE_CMD_FINI:
889 return vfs_detach(&puffs_vfsops);
890 default:
891 return ENOTTY;
892 }
893}
894