xref: /illumos-gate/usr/src/uts/common/fs/nfs/nfs3_vfsops.c (revision e010bda94b034e413b6fe35fd45bca0afaf1a0df)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 1986, 2010, Oracle and/or its affiliates. All rights reserved.
23  */
24 
25 /*
26  *	Copyright (c) 1983,1984,1985,1986,1987,1988,1989  AT&T.
27  *	All rights reserved.
28  */
29 
30 #include <sys/param.h>
31 #include <sys/types.h>
32 #include <sys/systm.h>
33 #include <sys/cred.h>
34 #include <sys/vfs.h>
35 #include <sys/vfs_opreg.h>
36 #include <sys/vnode.h>
37 #include <sys/pathname.h>
38 #include <sys/sysmacros.h>
39 #include <sys/kmem.h>
40 #include <sys/mkdev.h>
41 #include <sys/mount.h>
42 #include <sys/mntent.h>
43 #include <sys/statvfs.h>
44 #include <sys/errno.h>
45 #include <sys/debug.h>
46 #include <sys/cmn_err.h>
47 #include <sys/utsname.h>
48 #include <sys/bootconf.h>
49 #include <sys/modctl.h>
50 #include <sys/acl.h>
51 #include <sys/flock.h>
52 #include <sys/policy.h>
53 #include <sys/zone.h>
54 #include <sys/class.h>
55 #include <sys/socket.h>
56 #include <sys/netconfig.h>
57 #include <sys/tsol/tnet.h>
58 
59 #include <rpc/types.h>
60 #include <rpc/auth.h>
61 #include <rpc/clnt.h>
62 
63 #include <nfs/nfs.h>
64 #include <nfs/nfs_clnt.h>
65 #include <nfs/rnode.h>
66 #include <nfs/mount.h>
67 #include <nfs/nfs_acl.h>
68 
69 #include <fs/fs_subr.h>
70 
71 /*
72  * From rpcsec module (common/rpcsec).
73  */
74 extern int sec_clnt_loadinfo(struct sec_data *, struct sec_data **, model_t);
75 extern void sec_clnt_freeinfo(struct sec_data *);
76 
77 /*
78  * The order and contents of this structure must be kept in sync with that of
79  * rfsreqcnt_v3_tmpl in nfs_stats.c
80  */
81 static char *rfsnames_v3[] = {
82 	"null", "getattr", "setattr", "lookup", "access", "readlink", "read",
83 	"write", "create", "mkdir", "symlink", "mknod", "remove", "rmdir",
84 	"rename", "link", "readdir", "readdirplus", "fsstat", "fsinfo",
85 	"pathconf", "commit"
86 };
87 
88 /*
89  * This table maps from NFS protocol number into call type.
90  * Zero means a "Lookup" type call
91  * One  means a "Read" type call
92  * Two  means a "Write" type call
93  * This is used to select a default time-out.
94  */
95 static uchar_t call_type_v3[] = {
96 	0, 0, 1, 0, 0, 0, 1,
97 	2, 2, 2, 2, 2, 2, 2,
98 	2, 2, 1, 2, 0, 0, 0,
99 	2 };
100 
101 /*
102  * Similar table, but to determine which timer to use
103  * (only real reads and writes!)
104  */
105 static uchar_t timer_type_v3[] = {
106 	0, 0, 0, 0, 0, 0, 1,
107 	2, 0, 0, 0, 0, 0, 0,
108 	0, 0, 1, 1, 0, 0, 0,
109 	0 };
110 
111 /*
112  * This table maps from NFS protocol number into a call type
113  * for the semisoft mount option.
114  * Zero means do not repeat operation.
115  * One  means repeat.
116  */
117 static uchar_t ss_call_type_v3[] = {
118 	0, 0, 1, 0, 0, 0, 0,
119 	1, 1, 1, 1, 1, 1, 1,
120 	1, 1, 0, 0, 0, 0, 0,
121 	1 };
122 
123 /*
124  * nfs3 vfs operations.
125  */
126 static int	nfs3_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *);
127 static int	nfs3_unmount(vfs_t *, int, cred_t *);
128 static int	nfs3_root(vfs_t *, vnode_t **);
129 static int	nfs3_statvfs(vfs_t *, struct statvfs64 *);
130 static int	nfs3_sync(vfs_t *, short, cred_t *);
131 static int	nfs3_vget(vfs_t *, vnode_t **, fid_t *);
132 static int	nfs3_mountroot(vfs_t *, whymountroot_t);
133 static void	nfs3_freevfs(vfs_t *);
134 
135 static int	nfs3rootvp(vnode_t **, vfs_t *, struct servinfo *,
136 		    int, cred_t *, zone_t *);
137 
138 /*
139  * Initialize the vfs structure
140  */
141 
142 static int nfs3fstyp;
143 vfsops_t *nfs3_vfsops;
144 
145 /*
146  * Debug variable to check for rdma based
147  * transport startup and cleanup. Controlled
148  * through /etc/system. Off by default.
149  */
150 extern int rdma_debug;
151 
152 int
nfs3init(int fstyp,char * name)153 nfs3init(int fstyp, char *name)
154 {
155 	static const fs_operation_def_t nfs3_vfsops_template[] = {
156 		VFSNAME_MOUNT,		{ .vfs_mount = nfs3_mount },
157 		VFSNAME_UNMOUNT,	{ .vfs_unmount = nfs3_unmount },
158 		VFSNAME_ROOT,		{ .vfs_root = nfs3_root },
159 		VFSNAME_STATVFS,	{ .vfs_statvfs = nfs3_statvfs },
160 		VFSNAME_SYNC,		{ .vfs_sync = nfs3_sync },
161 		VFSNAME_VGET,		{ .vfs_vget = nfs3_vget },
162 		VFSNAME_MOUNTROOT,	{ .vfs_mountroot = nfs3_mountroot },
163 		VFSNAME_FREEVFS,	{ .vfs_freevfs = nfs3_freevfs },
164 		NULL,			NULL
165 	};
166 	int error;
167 
168 	error = vfs_setfsops(fstyp, nfs3_vfsops_template, &nfs3_vfsops);
169 	if (error != 0) {
170 		zcmn_err(GLOBAL_ZONEID, CE_WARN,
171 		    "nfs3init: bad vfs ops template");
172 		return (error);
173 	}
174 
175 	error = vn_make_ops(name, nfs3_vnodeops_template, &nfs3_vnodeops);
176 	if (error != 0) {
177 		(void) vfs_freevfsops_by_type(fstyp);
178 		zcmn_err(GLOBAL_ZONEID, CE_WARN,
179 		    "nfs3init: bad vnode ops template");
180 		return (error);
181 	}
182 
183 	nfs3fstyp = fstyp;
184 
185 	return (0);
186 }
187 
188 void
nfs3fini(void)189 nfs3fini(void)
190 {
191 }
192 
193 static void
nfs3_free_args(struct nfs_args * nargs,nfs_fhandle * fh)194 nfs3_free_args(struct nfs_args *nargs, nfs_fhandle *fh)
195 {
196 
197 	if (fh)
198 		kmem_free(fh, sizeof (*fh));
199 
200 	if (nargs->knconf) {
201 		if (nargs->knconf->knc_protofmly)
202 			kmem_free(nargs->knconf->knc_protofmly, KNC_STRSIZE);
203 		if (nargs->knconf->knc_proto)
204 			kmem_free(nargs->knconf->knc_proto, KNC_STRSIZE);
205 		kmem_free(nargs->knconf, sizeof (*nargs->knconf));
206 		nargs->knconf = NULL;
207 	}
208 
209 	if (nargs->fh) {
210 		kmem_free(nargs->fh, strlen(nargs->fh) + 1);
211 		nargs->fh = NULL;
212 	}
213 
214 	if (nargs->hostname) {
215 		kmem_free(nargs->hostname, strlen(nargs->hostname) + 1);
216 		nargs->hostname = NULL;
217 	}
218 
219 	if (nargs->addr) {
220 		if (nargs->addr->buf) {
221 			ASSERT(nargs->addr->len);
222 			kmem_free(nargs->addr->buf, nargs->addr->len);
223 		}
224 		kmem_free(nargs->addr, sizeof (struct netbuf));
225 		nargs->addr = NULL;
226 	}
227 
228 	if (nargs->syncaddr) {
229 		ASSERT(nargs->syncaddr->len);
230 		if (nargs->syncaddr->buf) {
231 			ASSERT(nargs->syncaddr->len);
232 			kmem_free(nargs->syncaddr->buf, nargs->syncaddr->len);
233 		}
234 		kmem_free(nargs->syncaddr, sizeof (struct netbuf));
235 		nargs->syncaddr = NULL;
236 	}
237 
238 	if (nargs->netname) {
239 		kmem_free(nargs->netname, strlen(nargs->netname) + 1);
240 		nargs->netname = NULL;
241 	}
242 
243 	if (nargs->nfs_ext_u.nfs_extA.secdata) {
244 		sec_clnt_freeinfo(nargs->nfs_ext_u.nfs_extA.secdata);
245 		nargs->nfs_ext_u.nfs_extA.secdata = NULL;
246 	}
247 }
248 
249 static int
nfs3_copyin(char * data,int datalen,struct nfs_args * nargs,nfs_fhandle * fh)250 nfs3_copyin(char *data, int datalen, struct nfs_args *nargs, nfs_fhandle *fh)
251 {
252 
253 	int error;
254 	size_t nlen;			/* length of netname */
255 	size_t hlen;			/* length of hostname */
256 	char netname[MAXNETNAMELEN+1];  /* server's netname */
257 	struct netbuf addr;		/* server's address */
258 	struct netbuf syncaddr;		/* AUTH_DES time sync addr */
259 	struct knetconfig *knconf;	/* transport knetconfig structure */
260 	struct sec_data *secdata = NULL;	/* security data */
261 	STRUCT_DECL(nfs_args, args);    	/* nfs mount arguments */
262 	STRUCT_DECL(knetconfig, knconf_tmp);
263 	STRUCT_DECL(netbuf, addr_tmp);
264 	int flags;
265 	char *p, *pf;
266 	char *userbufptr;
267 
268 
269 	bzero(nargs, sizeof (*nargs));
270 
271 	STRUCT_INIT(args, get_udatamodel());
272 	bzero(STRUCT_BUF(args), SIZEOF_STRUCT(nfs_args, DATAMODEL_NATIVE));
273 	if (copyin(data, STRUCT_BUF(args), MIN(datalen, STRUCT_SIZE(args))))
274 		return (EFAULT);
275 
276 	nargs->wsize = STRUCT_FGET(args, wsize);
277 	nargs->rsize = STRUCT_FGET(args, rsize);
278 	nargs->timeo = STRUCT_FGET(args, timeo);
279 	nargs->retrans = STRUCT_FGET(args, retrans);
280 	nargs->acregmin = STRUCT_FGET(args, acregmin);
281 	nargs->acregmax = STRUCT_FGET(args, acregmax);
282 	nargs->acdirmin = STRUCT_FGET(args, acdirmin);
283 	nargs->acdirmax = STRUCT_FGET(args, acdirmax);
284 
285 	flags = STRUCT_FGET(args, flags);
286 	nargs->flags = flags;
287 
288 	addr.buf = NULL;
289 	syncaddr.buf = NULL;
290 
291 	/*
292 	 * Allocate space for a knetconfig structure and
293 	 * its strings and copy in from user-land.
294 	 */
295 	knconf = kmem_zalloc(sizeof (*knconf), KM_SLEEP);
296 	STRUCT_INIT(knconf_tmp, get_udatamodel());
297 	if (copyin(STRUCT_FGETP(args, knconf), STRUCT_BUF(knconf_tmp),
298 	    STRUCT_SIZE(knconf_tmp))) {
299 		kmem_free(knconf, sizeof (*knconf));
300 		return (EFAULT);
301 	}
302 
303 	knconf->knc_semantics = STRUCT_FGET(knconf_tmp, knc_semantics);
304 	knconf->knc_protofmly = STRUCT_FGETP(knconf_tmp, knc_protofmly);
305 	knconf->knc_proto = STRUCT_FGETP(knconf_tmp, knc_proto);
306 	if (get_udatamodel() != DATAMODEL_LP64) {
307 		knconf->knc_rdev = expldev(STRUCT_FGET(knconf_tmp, knc_rdev));
308 	} else {
309 		knconf->knc_rdev = STRUCT_FGET(knconf_tmp, knc_rdev);
310 	}
311 
312 	pf = kmem_alloc(KNC_STRSIZE, KM_SLEEP);
313 	p = kmem_alloc(KNC_STRSIZE, KM_SLEEP);
314 	error = copyinstr(knconf->knc_protofmly, pf, KNC_STRSIZE, NULL);
315 	if (error) {
316 		kmem_free(pf, KNC_STRSIZE);
317 		kmem_free(p, KNC_STRSIZE);
318 		kmem_free(knconf, sizeof (*knconf));
319 		return (error);
320 	}
321 
322 	error = copyinstr(knconf->knc_proto, p, KNC_STRSIZE, NULL);
323 	if (error) {
324 		kmem_free(pf, KNC_STRSIZE);
325 		kmem_free(p, KNC_STRSIZE);
326 		kmem_free(knconf, sizeof (*knconf));
327 		return (error);
328 	}
329 
330 
331 	knconf->knc_protofmly = pf;
332 	knconf->knc_proto = p;
333 
334 	nargs->knconf = knconf;
335 	/*
336 	 * Get server address
337 	 */
338 	STRUCT_INIT(addr_tmp, get_udatamodel());
339 	if (copyin(STRUCT_FGETP(args, addr), STRUCT_BUF(addr_tmp),
340 	    STRUCT_SIZE(addr_tmp))) {
341 		error = EFAULT;
342 		goto errout;
343 	}
344 
345 	nargs->addr = kmem_alloc(sizeof (struct netbuf), KM_SLEEP);
346 	userbufptr = STRUCT_FGETP(addr_tmp, buf);
347 	addr.len = STRUCT_FGET(addr_tmp, len);
348 	addr.buf = kmem_alloc(addr.len, KM_SLEEP);
349 	addr.maxlen = addr.len;
350 	if (copyin(userbufptr, addr.buf, addr.len)) {
351 		kmem_free(addr.buf, addr.len);
352 		error = EFAULT;
353 		goto errout;
354 	}
355 	bcopy(&addr, nargs->addr, sizeof (struct netbuf));
356 
357 	/*
358 	 * Get the root fhandle
359 	 */
360 
361 	if (copyin(STRUCT_FGETP(args, fh), fh, sizeof (nfs_fhandle))) {
362 		error = EFAULT;
363 		goto errout;
364 	}
365 
366 
367 	/*
368 	 * Get server's hostname
369 	 */
370 	if (flags & NFSMNT_HOSTNAME) {
371 		error = copyinstr(STRUCT_FGETP(args, hostname), netname,
372 		    sizeof (netname), &hlen);
373 	if (error)
374 		goto errout;
375 	nargs->hostname = kmem_zalloc(hlen, KM_SLEEP);
376 	(void) strcpy(nargs->hostname, netname);
377 	} else {
378 	nargs->hostname = NULL;
379 	}
380 
381 
382 	/*
383 	 * If there are syncaddr and netname data, load them in. This is
384 	 * to support data needed for NFSV4 when AUTH_DH is the negotiated
385 	 * flavor via SECINFO. (instead of using MOUNT protocol in V3).
386 	 */
387 	netname[0] = '\0';
388 	if (flags & NFSMNT_SECURE) {
389 		if (STRUCT_FGETP(args, syncaddr) == NULL) {
390 			error = EINVAL;
391 			goto errout;
392 		}
393 		/* get syncaddr */
394 		STRUCT_INIT(addr_tmp, get_udatamodel());
395 		if (copyin(STRUCT_FGETP(args, syncaddr), STRUCT_BUF(addr_tmp),
396 		    STRUCT_SIZE(addr_tmp))) {
397 			error = EINVAL;
398 			goto errout;
399 		}
400 		userbufptr = STRUCT_FGETP(addr_tmp, buf);
401 		syncaddr.len = STRUCT_FGET(addr_tmp, len);
402 		syncaddr.buf = kmem_alloc(syncaddr.len, KM_SLEEP);
403 		syncaddr.maxlen = syncaddr.len;
404 		if (copyin(userbufptr, syncaddr.buf, syncaddr.len)) {
405 			kmem_free(syncaddr.buf, syncaddr.len);
406 			error = EFAULT;
407 			goto errout;
408 		}
409 
410 		nargs->syncaddr = kmem_alloc(sizeof (struct netbuf), KM_SLEEP);
411 		bcopy(&syncaddr, nargs->syncaddr, sizeof (struct netbuf));
412 
413 		ASSERT(STRUCT_FGETP(args, netname));
414 
415 		if (copyinstr(STRUCT_FGETP(args, netname), netname,
416 		    sizeof (netname), &nlen)) {
417 			error = EFAULT;
418 			goto errout;
419 		}
420 
421 		netname[nlen] = '\0';
422 		nargs->netname = kmem_zalloc(nlen, KM_SLEEP);
423 		(void) strcpy(nargs->netname, netname);
424 	}
425 
426 	/*
427 	 * Get the extention data which has the security data structure.
428 	 * This includes data for AUTH_SYS as well.
429 	 */
430 	if (flags & NFSMNT_NEWARGS) {
431 		nargs->nfs_args_ext = STRUCT_FGET(args, nfs_args_ext);
432 		if (nargs->nfs_args_ext == NFS_ARGS_EXTA ||
433 		    nargs->nfs_args_ext == NFS_ARGS_EXTB) {
434 			/*
435 			 * Indicating the application is using the new
436 			 * sec_data structure to pass in the security
437 			 * data.
438 			 */
439 			if (STRUCT_FGETP(args,
440 			    nfs_ext_u.nfs_extA.secdata) != NULL) {
441 				error = sec_clnt_loadinfo(
442 				    (struct sec_data *)STRUCT_FGETP(args,
443 				    nfs_ext_u.nfs_extA.secdata), &secdata,
444 				    get_udatamodel());
445 			}
446 			nargs->nfs_ext_u.nfs_extA.secdata = secdata;
447 		}
448 	}
449 
450 	if (error)
451 		goto errout;
452 
453 	/*
454 	 * Failover support:
455 	 *
456 	 * We may have a linked list of nfs_args structures,
457 	 * which means the user is looking for failover.  If
458 	 * the mount is either not "read-only" or "soft",
459 	 * we want to bail out with EINVAL.
460 	 */
461 	if (nargs->nfs_args_ext == NFS_ARGS_EXTB)
462 		nargs->nfs_ext_u.nfs_extB.next =
463 		    STRUCT_FGETP(args, nfs_ext_u.nfs_extB.next);
464 
465 errout:
466 	if (error)
467 		nfs3_free_args(nargs, fh);
468 
469 	return (error);
470 }
471 
472 
473 /*
474  * nfs mount vfsop
475  * Set up mount info record and attach it to vfs struct.
476  */
477 static int
nfs3_mount(vfs_t * vfsp,vnode_t * mvp,struct mounta * uap,cred_t * cr)478 nfs3_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr)
479 {
480 	struct nfs_args	*args = NULL;
481 	nfs_fhandle	*fhandle = NULL;
482 	char *data = uap->dataptr;
483 	int error;
484 	vnode_t *rtvp;			/* the server's root */
485 	mntinfo_t *mi;			/* mount info, pointed at by vfs */
486 	size_t nlen;			/* length of netname */
487 	struct knetconfig *knconf;	/* transport knetconfig structure */
488 	struct knetconfig *rdma_knconf;	/* rdma transport structure */
489 	rnode_t *rp;
490 	struct servinfo *svp;		/* nfs server info */
491 	struct servinfo *svp_tail = NULL; /* previous nfs server info */
492 	struct servinfo *svp_head;	/* first nfs server info */
493 	struct servinfo *svp_2ndlast;	/* 2nd last in server info list */
494 	struct sec_data *secdata;	/* security data */
495 	int flags, addr_type;
496 	zone_t *zone = nfs_zone();
497 	zone_t *mntzone = NULL;
498 
499 
500 	if ((error = secpolicy_fs_mount(cr, mvp, vfsp)) != 0)
501 		return (EPERM);
502 
503 	if (mvp->v_type != VDIR)
504 		return (ENOTDIR);
505 
506 	/*
507 	 * get arguments
508 	 *
509 	 * nfs_args is now versioned and is extensible, so
510 	 * uap->datalen might be different from sizeof (args)
511 	 * in a compatible situation.
512 	 */
513 
514 more:
515 
516 	if (!(uap->flags & MS_SYSSPACE)) {
517 		if (args == NULL)
518 			args = kmem_alloc(sizeof (struct nfs_args), KM_SLEEP);
519 		else {
520 			nfs3_free_args(args, fhandle);
521 			fhandle = NULL;
522 		}
523 		if (fhandle == NULL)
524 			fhandle = kmem_alloc(sizeof (nfs_fhandle), KM_SLEEP);
525 		error = nfs3_copyin(data, uap->datalen, args, fhandle);
526 		if (error) {
527 			if (args)
528 				kmem_free(args, sizeof (*args));
529 			return (error);
530 		}
531 	} else {
532 		args = (struct nfs_args *)data;
533 		fhandle = (nfs_fhandle *)args->fh;
534 	}
535 
536 
537 	flags = args->flags;
538 
539 	if (uap->flags & MS_REMOUNT) {
540 		size_t	n;
541 		char	name[FSTYPSZ];
542 
543 		if (uap->flags & MS_SYSSPACE) {
544 			error = copystr(uap->fstype, name, FSTYPSZ, &n);
545 		} else {
546 			nfs3_free_args(args, fhandle);
547 			kmem_free(args, sizeof (*args));
548 			error = copyinstr(uap->fstype, name, FSTYPSZ, &n);
549 		}
550 		if (error) {
551 			if (error == ENAMETOOLONG)
552 				return (EINVAL);
553 			return (error);
554 		}
555 
556 		/*
557 		 * This check is to ensure that the request is a
558 		 * genuine nfs remount request.
559 		 */
560 
561 		if (strncmp(name, "nfs", 3) != 0)
562 			return (EINVAL);
563 
564 		/*
565 		 * If the request changes the locking type, disallow the
566 		 * remount,
567 		 * because it's questionable whether we can transfer the
568 		 * locking state correctly.
569 		 */
570 
571 		if ((mi = VFTOMI(vfsp)) != NULL) {
572 			uint_t new_mi_llock;
573 			uint_t old_mi_llock;
574 
575 			new_mi_llock = (flags & NFSMNT_LLOCK) ? 1 : 0;
576 			old_mi_llock = (mi->mi_flags & MI_LLOCK) ? 1 : 0;
577 			if (old_mi_llock != new_mi_llock)
578 				return (EBUSY);
579 		}
580 		return (0);
581 	}
582 
583 	mutex_enter(&mvp->v_lock);
584 	if (!(uap->flags & MS_OVERLAY) &&
585 	    (mvp->v_count != 1 || (mvp->v_flag & VROOT))) {
586 		mutex_exit(&mvp->v_lock);
587 		if (!(uap->flags & MS_SYSSPACE)) {
588 			nfs3_free_args(args, fhandle);
589 			kmem_free(args, sizeof (*args));
590 		}
591 		return (EBUSY);
592 	}
593 	mutex_exit(&mvp->v_lock);
594 
595 	/* make sure things are zeroed for errout: */
596 	rtvp = NULL;
597 	mi = NULL;
598 	secdata = NULL;
599 
600 	/*
601 	 * A valid knetconfig structure is required.
602 	 */
603 	if (!(flags & NFSMNT_KNCONF)) {
604 		if (!(uap->flags & MS_SYSSPACE)) {
605 			nfs3_free_args(args, fhandle);
606 			kmem_free(args, sizeof (*args));
607 		}
608 		return (EINVAL);
609 	}
610 
611 	if ((strlen(args->knconf->knc_protofmly) >= KNC_STRSIZE) ||
612 	    (strlen(args->knconf->knc_proto) >= KNC_STRSIZE)) {
613 		if (!(uap->flags & MS_SYSSPACE)) {
614 			nfs3_free_args(args, fhandle);
615 			kmem_free(args, sizeof (*args));
616 		}
617 		return (EINVAL);
618 	}
619 
620 	/*
621 	 * Allocate a servinfo struct.
622 	 */
623 	svp = kmem_zalloc(sizeof (*svp), KM_SLEEP);
624 	mutex_init(&svp->sv_lock, NULL, MUTEX_DEFAULT, NULL);
625 	if (svp_tail) {
626 		svp_2ndlast = svp_tail;
627 		svp_tail->sv_next = svp;
628 	} else {
629 		svp_head = svp;
630 		svp_2ndlast = svp;
631 	}
632 
633 	svp_tail = svp;
634 
635 	svp->sv_knconf = args->knconf;
636 	args->knconf = NULL;
637 
638 	if (args->addr == NULL || args->addr->buf == NULL) {
639 		error = EINVAL;
640 		goto errout;
641 	}
642 
643 	svp->sv_addr.maxlen = args->addr->maxlen;
644 	svp->sv_addr.len = args->addr->len;
645 	svp->sv_addr.buf = args->addr->buf;
646 	args->addr->buf = NULL;
647 
648 	/*
649 	 * Check the root fhandle length
650 	 */
651 	ASSERT(fhandle);
652 	if (fhandle->fh_len > NFS3_FHSIZE || fhandle->fh_len == 0) {
653 		error = EINVAL;
654 #ifdef DEBUG
655 		zcmn_err(getzoneid(), CE_WARN,
656 		    "nfs3_mount: got an invalid fhandle. fh_len = %d",
657 		    fhandle->fh_len);
658 		fhandle->fh_len = NFS_FHANDLE_LEN;
659 		nfs_printfhandle(fhandle);
660 #endif
661 		goto errout;
662 	}
663 
664 	bcopy(&fhandle->fh_buf, &svp->sv_fhandle.fh_buf, fhandle->fh_len);
665 	svp->sv_fhandle.fh_len = fhandle->fh_len;
666 
667 	/*
668 	 * Get server's hostname
669 	 */
670 	if (flags & NFSMNT_HOSTNAME) {
671 		if (args->hostname == NULL) {
672 			error = EINVAL;
673 			goto errout;
674 		}
675 		svp->sv_hostnamelen = strlen(args->hostname) + 1;
676 		svp->sv_hostname = args->hostname;
677 		args->hostname = NULL;
678 	} else {
679 		char *p = "unknown-host";
680 		svp->sv_hostnamelen = strlen(p) + 1;
681 		svp->sv_hostname = kmem_zalloc(svp->sv_hostnamelen, KM_SLEEP);
682 		(void) strcpy(svp->sv_hostname, p);
683 	}
684 
685 
686 	/*
687 	 * RDMA MOUNT SUPPORT FOR NFS v3:
688 	 * Establish, is it possible to use RDMA, if so overload the
689 	 * knconf with rdma specific knconf and free the orignal.
690 	 */
691 	if ((flags & NFSMNT_TRYRDMA) || (flags & NFSMNT_DORDMA)) {
692 		/*
693 		 * Determine the addr type for RDMA, IPv4 or v6.
694 		 */
695 		if (strcmp(svp->sv_knconf->knc_protofmly, NC_INET) == 0)
696 			addr_type = AF_INET;
697 		else if (strcmp(svp->sv_knconf->knc_protofmly, NC_INET6) == 0)
698 			addr_type = AF_INET6;
699 
700 		if (rdma_reachable(addr_type, &svp->sv_addr,
701 		    &rdma_knconf) == 0) {
702 			/*
703 			 * If successful, hijack the orignal knconf and
704 			 * replace with a new one, depending on the flags.
705 			 */
706 			svp->sv_origknconf = svp->sv_knconf;
707 			svp->sv_knconf = rdma_knconf;
708 			knconf = rdma_knconf;
709 		} else {
710 			if (flags & NFSMNT_TRYRDMA) {
711 #ifdef	DEBUG
712 				if (rdma_debug)
713 					zcmn_err(getzoneid(), CE_WARN,
714 					    "no RDMA onboard, revert\n");
715 #endif
716 			}
717 
718 			if (flags & NFSMNT_DORDMA) {
719 				/*
720 				 * If proto=rdma is specified and no RDMA
721 				 * path to this server is avialable then
722 				 * ditch this server.
723 				 * This is not included in the mountable
724 				 * server list or the replica list.
725 				 * Check if more servers are specified;
726 				 * Failover case, otherwise bail out of mount.
727 				 */
728 				if (args->nfs_args_ext == NFS_ARGS_EXTB &&
729 				    args->nfs_ext_u.nfs_extB.next != NULL) {
730 					data = (char *)
731 					    args->nfs_ext_u.nfs_extB.next;
732 					if (uap->flags & MS_RDONLY &&
733 					    !(flags & NFSMNT_SOFT)) {
734 						if (svp_head->sv_next == NULL) {
735 							svp_tail = NULL;
736 							svp_2ndlast = NULL;
737 							sv_free(svp_head);
738 							goto more;
739 						} else {
740 							svp_tail = svp_2ndlast;
741 							svp_2ndlast->sv_next =
742 							    NULL;
743 							sv_free(svp);
744 							goto more;
745 						}
746 					}
747 				} else {
748 					/*
749 					 * This is the last server specified
750 					 * in the nfs_args list passed down
751 					 * and its not rdma capable.
752 					 */
753 					if (svp_head->sv_next == NULL) {
754 						/*
755 						 * Is this the only one
756 						 */
757 						error = EINVAL;
758 #ifdef	DEBUG
759 						if (rdma_debug)
760 							zcmn_err(getzoneid(),
761 							    CE_WARN,
762 							    "No RDMA srv");
763 #endif
764 						goto errout;
765 					} else {
766 						/*
767 						 * There is list, since some
768 						 * servers specified before
769 						 * this passed all requirements
770 						 */
771 						svp_tail = svp_2ndlast;
772 						svp_2ndlast->sv_next = NULL;
773 						sv_free(svp);
774 						goto proceed;
775 					}
776 				}
777 			}
778 		}
779 	}
780 
781 	/*
782 	 * Get the extention data which has the new security data structure.
783 	 */
784 	if (flags & NFSMNT_NEWARGS) {
785 		switch (args->nfs_args_ext) {
786 		case NFS_ARGS_EXTA:
787 		case NFS_ARGS_EXTB:
788 			/*
789 			 * Indicating the application is using the new
790 			 * sec_data structure to pass in the security
791 			 * data.
792 			 */
793 			secdata = args->nfs_ext_u.nfs_extA.secdata;
794 			if (args->nfs_ext_u.nfs_extA.secdata == NULL) {
795 				error = EINVAL;
796 			} else {
797 				/*
798 				 * Need to validate the flavor here if
799 				 * sysspace, userspace was already
800 				 * validate from the nfs_copyin function.
801 				 */
802 				switch (secdata->rpcflavor) {
803 				case AUTH_NONE:
804 				case AUTH_UNIX:
805 				case AUTH_LOOPBACK:
806 				case AUTH_DES:
807 				case RPCSEC_GSS:
808 					args->nfs_ext_u.nfs_extA.secdata = NULL;
809 					break;
810 				default:
811 					error = EINVAL;
812 					goto errout;
813 				}
814 			}
815 			break;
816 
817 		default:
818 			error = EINVAL;
819 			break;
820 		}
821 	} else if (flags & NFSMNT_SECURE) {
822 		/*
823 		 * Keep this for backward compatibility to support
824 		 * NFSMNT_SECURE/NFSMNT_RPCTIMESYNC flags.
825 		 */
826 		if (args->syncaddr == NULL || args->syncaddr->buf == NULL) {
827 			error = EINVAL;
828 			goto errout;
829 		}
830 		/*
831 		 * Move security related data to the sec_data structure.
832 		 */
833 		{
834 			dh_k4_clntdata_t *data;
835 			char *pf, *p;
836 			secdata = kmem_alloc(sizeof (*secdata), KM_SLEEP);
837 			if (flags & NFSMNT_RPCTIMESYNC)
838 				secdata->flags |= AUTH_F_RPCTIMESYNC;
839 			data = kmem_alloc(sizeof (*data), KM_SLEEP);
840 			bcopy(args->syncaddr, &data->syncaddr,
841 			    sizeof (*args->syncaddr));
842 
843 			/*
844 			 * duplicate the knconf information for the
845 			 * new opaque data.
846 			 */
847 			data->knconf = kmem_alloc(sizeof (*knconf), KM_SLEEP);
848 			*data->knconf = *knconf;
849 			pf = kmem_alloc(KNC_STRSIZE, KM_SLEEP);
850 			p = kmem_alloc(KNC_STRSIZE, KM_SLEEP);
851 			bcopy(knconf->knc_protofmly, pf, KNC_STRSIZE);
852 			bcopy(knconf->knc_proto, pf, KNC_STRSIZE);
853 			data->knconf->knc_protofmly = pf;
854 			data->knconf->knc_proto = p;
855 
856 			nlen = strlen(args->hostname) + 1;
857 			/* move server netname to the sec_data structure */
858 			if (nlen != 0) {
859 				data->netname = kmem_alloc(nlen, KM_SLEEP);
860 				bcopy(args->hostname, data->netname, nlen);
861 				data->netnamelen = nlen;
862 			}
863 			secdata->secmod = secdata->rpcflavor = AUTH_DES;
864 			secdata->data = (caddr_t)data;
865 		}
866 	} else 	{
867 		secdata = kmem_alloc(sizeof (*secdata), KM_SLEEP);
868 		secdata->secmod = secdata->rpcflavor = AUTH_UNIX;
869 		secdata->data = NULL;
870 	}
871 
872 	svp->sv_secdata = secdata;
873 	if (error)
874 		goto errout;
875 
876 	/*
877 	 * See bug 1180236.
878 	 * If mount secure failed, we will fall back to AUTH_NONE
879 	 * and try again.  nfs3rootvp() will turn this back off.
880 	 *
881 	 * The NFS Version 3 mount uses the FSINFO and GETATTR
882 	 * procedures.  The server should not care if these procedures
883 	 * have the proper security flavor, so if mount retries using
884 	 * AUTH_NONE that does not require a credential setup for root
885 	 * then the automounter would work without requiring root to be
886 	 * keylogged into AUTH_DES.
887 	 */
888 	if (secdata->rpcflavor != AUTH_UNIX &&
889 	    secdata->rpcflavor != AUTH_LOOPBACK)
890 		secdata->flags |= AUTH_F_TRYNONE;
891 
892 	/*
893 	 * Failover support:
894 	 *
895 	 * We may have a linked list of nfs_args structures,
896 	 * which means the user is looking for failover.  If
897 	 * the mount is either not "read-only" or "soft",
898 	 * we want to bail out with EINVAL.
899 	 */
900 	if (args->nfs_args_ext == NFS_ARGS_EXTB &&
901 	    args->nfs_ext_u.nfs_extB.next != NULL) {
902 		if (uap->flags & MS_RDONLY && !(flags & NFSMNT_SOFT)) {
903 			data = (char *)args->nfs_ext_u.nfs_extB.next;
904 			goto more;
905 		}
906 		error = EINVAL;
907 		goto errout;
908 	}
909 
910 	/*
911 	 * Determine the zone we're being mounted into.
912 	 */
913 	zone_hold(mntzone = zone);		/* start with this assumption */
914 	if (getzoneid() == GLOBAL_ZONEID) {
915 		zone_rele(mntzone);
916 		mntzone = zone_find_by_path(refstr_value(vfsp->vfs_mntpt));
917 		ASSERT(mntzone != NULL);
918 		if (mntzone != zone) {
919 			error = EBUSY;
920 			goto errout;
921 		}
922 	}
923 
924 	if (is_system_labeled()) {
925 		error = nfs_mount_label_policy(vfsp, &svp->sv_addr,
926 		    svp->sv_knconf, cr);
927 
928 		if (error > 0)
929 			goto errout;
930 
931 		if (error == -1) {
932 			/* change mount to read-only to prevent write-down */
933 			vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0);
934 		}
935 	}
936 
937 	/*
938 	 * Stop the mount from going any further if the zone is going away.
939 	 */
940 	if (zone_status_get(mntzone) >= ZONE_IS_SHUTTING_DOWN) {
941 		error = EBUSY;
942 		goto errout;
943 	}
944 
945 	/*
946 	 * Get root vnode.
947 	 */
948 proceed:
949 	error = nfs3rootvp(&rtvp, vfsp, svp_head, flags, cr, mntzone);
950 
951 	if (error)
952 		goto errout;
953 
954 	/*
955 	 * Set option fields in the mount info record
956 	 */
957 	mi = VTOMI(rtvp);
958 
959 	if (svp_head->sv_next)
960 		mi->mi_flags |= MI_LLOCK;
961 
962 	error = nfs_setopts(rtvp, DATAMODEL_NATIVE, args);
963 
964 errout:
965 	if (rtvp != NULL) {
966 		if (error) {
967 			rp = VTOR(rtvp);
968 			if (rp->r_flags & RHASHED)
969 				rp_rmhash(rp);
970 		}
971 		VN_RELE(rtvp);
972 	}
973 
974 	if (error) {
975 		sv_free(svp_head);
976 		if (mi != NULL) {
977 			nfs_async_stop(vfsp);
978 			nfs_async_manager_stop(vfsp);
979 			if (mi->mi_io_kstats) {
980 				kstat_delete(mi->mi_io_kstats);
981 				mi->mi_io_kstats = NULL;
982 			}
983 			if (mi->mi_ro_kstats) {
984 				kstat_delete(mi->mi_ro_kstats);
985 				mi->mi_ro_kstats = NULL;
986 			}
987 			nfs_free_mi(mi);
988 		}
989 	}
990 
991 
992 	if (!(uap->flags & MS_SYSSPACE)) {
993 		nfs3_free_args(args, fhandle);
994 		kmem_free(args, sizeof (*args));
995 	}
996 
997 	if (mntzone != NULL)
998 		zone_rele(mntzone);
999 
1000 	return (error);
1001 }
1002 
1003 static int nfs3_dynamic = 0;	/* global variable to enable dynamic retrans. */
1004 static ushort_t nfs3_max_threads = 8;	/* max number of active async threads */
1005 uint_t nfs3_bsize = 32 * 1024;	/* client `block' size */
1006 static uint_t nfs3_async_clusters = 1;	/* # of reqs from each async queue */
1007 static uint_t nfs3_cots_timeo = NFS_COTS_TIMEO;
1008 
1009 static int
nfs3rootvp(vnode_t ** rtvpp,vfs_t * vfsp,struct servinfo * svp,int flags,cred_t * cr,zone_t * zone)1010 nfs3rootvp(vnode_t **rtvpp, vfs_t *vfsp, struct servinfo *svp,
1011     int flags, cred_t *cr, zone_t *zone)
1012 {
1013 	vnode_t *rtvp;
1014 	mntinfo_t *mi;
1015 	dev_t nfs_dev;
1016 	struct vattr va;
1017 	struct FSINFO3args args;
1018 	struct FSINFO3res res;
1019 	int error;
1020 	int douprintf;
1021 	rnode_t *rp;
1022 	int i;
1023 	uint_t max_transfer_size;
1024 	struct nfs_stats *nfsstatsp;
1025 	cred_t *lcr = NULL, *tcr = cr;
1026 
1027 	nfsstatsp = zone_getspecific(nfsstat_zone_key, nfs_zone());
1028 	ASSERT(nfsstatsp != NULL);
1029 
1030 	ASSERT(nfs_zone() == zone);
1031 	/*
1032 	 * Create a mount record and link it to the vfs struct.
1033 	 */
1034 	mi = kmem_zalloc(sizeof (*mi), KM_SLEEP);
1035 	mutex_init(&mi->mi_lock, NULL, MUTEX_DEFAULT, NULL);
1036 	mutex_init(&mi->mi_remap_lock, NULL, MUTEX_DEFAULT, NULL);
1037 	mi->mi_flags = MI_ACL | MI_EXTATTR;
1038 	if (!(flags & NFSMNT_SOFT))
1039 		mi->mi_flags |= MI_HARD;
1040 	if ((flags & NFSMNT_SEMISOFT))
1041 		mi->mi_flags |= MI_SEMISOFT;
1042 	if ((flags & NFSMNT_NOPRINT))
1043 		mi->mi_flags |= MI_NOPRINT;
1044 	if (flags & NFSMNT_INT)
1045 		mi->mi_flags |= MI_INT;
1046 	mi->mi_retrans = NFS_RETRIES;
1047 	if (svp->sv_knconf->knc_semantics == NC_TPI_COTS_ORD ||
1048 	    svp->sv_knconf->knc_semantics == NC_TPI_COTS)
1049 		mi->mi_timeo = nfs3_cots_timeo;
1050 	else
1051 		mi->mi_timeo = NFS_TIMEO;
1052 	mi->mi_prog = NFS_PROGRAM;
1053 	mi->mi_vers = NFS_V3;
1054 	mi->mi_rfsnames = rfsnames_v3;
1055 	mi->mi_reqs = nfsstatsp->nfs_stats_v3.rfsreqcnt_ptr;
1056 	mi->mi_call_type = call_type_v3;
1057 	mi->mi_ss_call_type = ss_call_type_v3;
1058 	mi->mi_timer_type = timer_type_v3;
1059 	mi->mi_aclnames = aclnames_v3;
1060 	mi->mi_aclreqs = nfsstatsp->nfs_stats_v3.aclreqcnt_ptr;
1061 	mi->mi_acl_call_type = acl_call_type_v3;
1062 	mi->mi_acl_ss_call_type = acl_ss_call_type_v3;
1063 	mi->mi_acl_timer_type = acl_timer_type_v3;
1064 	cv_init(&mi->mi_failover_cv, NULL, CV_DEFAULT, NULL);
1065 	mi->mi_servers = svp;
1066 	mi->mi_curr_serv = svp;
1067 	mi->mi_acregmin = SEC2HR(ACREGMIN);
1068 	mi->mi_acregmax = SEC2HR(ACREGMAX);
1069 	mi->mi_acdirmin = SEC2HR(ACDIRMIN);
1070 	mi->mi_acdirmax = SEC2HR(ACDIRMAX);
1071 
1072 	if (nfs3_dynamic)
1073 		mi->mi_flags |= MI_DYNAMIC;
1074 
1075 	if (flags & NFSMNT_DIRECTIO)
1076 		mi->mi_flags |= MI_DIRECTIO;
1077 
1078 	mutex_init(&mi->mi_rnodes_lock, NULL, MUTEX_DEFAULT, NULL);
1079 	list_create(&mi->mi_rnodes, sizeof (rnode_t),
1080 	    offsetof(rnode_t, r_mi_link));
1081 
1082 	/*
1083 	 * Make a vfs struct for nfs.  We do this here instead of below
1084 	 * because rtvp needs a vfs before we can do a getattr on it.
1085 	 *
1086 	 * Assign a unique device id to the mount
1087 	 */
1088 	mutex_enter(&nfs_minor_lock);
1089 	do {
1090 		nfs_minor = (nfs_minor + 1) & MAXMIN32;
1091 		nfs_dev = makedevice(nfs_major, nfs_minor);
1092 	} while (vfs_devismounted(nfs_dev));
1093 	mutex_exit(&nfs_minor_lock);
1094 
1095 	vfsp->vfs_dev = nfs_dev;
1096 	vfs_make_fsid(&vfsp->vfs_fsid, nfs_dev, nfs3fstyp);
1097 	vfsp->vfs_data = (caddr_t)mi;
1098 	vfsp->vfs_fstype = nfsfstyp;
1099 
1100 	/*
1101 	 * Verify that nfs3_bsize tuneable is set to an
1102 	 * acceptable value.  It be a multiple of PAGESIZE or
1103 	 * file corruption can occur.
1104 	 */
1105 	if (nfs3_bsize & PAGEOFFSET)
1106 		nfs3_bsize &= PAGEMASK;
1107 	if (nfs3_bsize < PAGESIZE)
1108 		nfs3_bsize = PAGESIZE;
1109 	vfsp->vfs_bsize = nfs3_bsize;
1110 
1111 	/*
1112 	 * Initialize fields used to support async putpage operations.
1113 	 */
1114 	for (i = 0; i < NFS_ASYNC_TYPES; i++)
1115 		mi->mi_async_clusters[i] = nfs3_async_clusters;
1116 	mi->mi_async_init_clusters = nfs3_async_clusters;
1117 	mi->mi_async_curr[NFS_ASYNC_QUEUE] =
1118 	    mi->mi_async_curr[NFS_ASYNC_PGOPS_QUEUE] = &mi->mi_async_reqs[0];
1119 	mi->mi_max_threads = nfs3_max_threads;
1120 	mutex_init(&mi->mi_async_lock, NULL, MUTEX_DEFAULT, NULL);
1121 	cv_init(&mi->mi_async_reqs_cv, NULL, CV_DEFAULT, NULL);
1122 	cv_init(&mi->mi_async_work_cv[NFS_ASYNC_QUEUE], NULL, CV_DEFAULT, NULL);
1123 	cv_init(&mi->mi_async_work_cv[NFS_ASYNC_PGOPS_QUEUE], NULL,
1124 	    CV_DEFAULT, NULL);
1125 	cv_init(&mi->mi_async_cv, NULL, CV_DEFAULT, NULL);
1126 
1127 	mi->mi_vfsp = vfsp;
1128 	mi->mi_zone = zone;
1129 	zone_init_ref(&mi->mi_zone_ref);
1130 	zone_hold_ref(zone, &mi->mi_zone_ref, ZONE_REF_NFS);
1131 	nfs_mi_zonelist_add(mi);
1132 
1133 	/*
1134 	 * Make the root vnode, use it to get attributes,
1135 	 * then remake it with the attributes.
1136 	 */
1137 	rtvp = makenfs3node((nfs_fh3 *)&svp->sv_fhandle,
1138 	    NULL, vfsp, gethrtime(), cr, NULL, NULL);
1139 
1140 	/*
1141 	 * Make the FSINFO calls, primarily at this point to
1142 	 * determine the transfer size.  For client failover,
1143 	 * we'll want this to be the minimum bid from any
1144 	 * server, so that we don't overrun stated limits.
1145 	 *
1146 	 * While we're looping, we'll turn off AUTH_F_TRYNONE,
1147 	 * which is only for the mount operation.
1148 	 */
1149 
1150 	mi->mi_tsize = nfs3_tsize(svp->sv_knconf);
1151 	mi->mi_stsize = mi->mi_tsize;
1152 
1153 	mi->mi_curread = nfs3_bsize;
1154 	mi->mi_curwrite = mi->mi_curread;
1155 
1156 	/*
1157 	 * If the uid is set then set the creds for secure mounts
1158 	 * by proxy processes such as automountd.
1159 	 */
1160 	if (svp->sv_secdata->uid != 0 &&
1161 	    svp->sv_secdata->rpcflavor == RPCSEC_GSS) {
1162 		lcr = crdup(cr);
1163 		(void) crsetugid(lcr, svp->sv_secdata->uid, crgetgid(cr));
1164 		tcr = lcr;
1165 	}
1166 
1167 	for (svp = mi->mi_servers; svp != NULL; svp = svp->sv_next) {
1168 		douprintf = 1;
1169 		mi->mi_curr_serv = svp;
1170 		max_transfer_size = nfs3_tsize(svp->sv_knconf);
1171 		mi->mi_tsize = MIN(max_transfer_size, mi->mi_tsize);
1172 		mi->mi_stsize = MIN(max_transfer_size, mi->mi_stsize);
1173 		mi->mi_curread = MIN(max_transfer_size, mi->mi_curread);
1174 		mi->mi_curwrite = MIN(max_transfer_size, mi->mi_curwrite);
1175 		args.fsroot = *(nfs_fh3 *)&svp->sv_fhandle;
1176 
1177 		error = rfs3call(mi, NFSPROC3_FSINFO,
1178 		    xdr_nfs_fh3, (caddr_t)&args,
1179 		    xdr_FSINFO3res, (caddr_t)&res, tcr,
1180 		    &douprintf, &res.status, 0, NULL);
1181 		if (error)
1182 			goto bad;
1183 		error = geterrno3(res.status);
1184 		if (error)
1185 			goto bad;
1186 
1187 		/* get type of root node */
1188 		if (res.resok.obj_attributes.attributes) {
1189 			if (res.resok.obj_attributes.attr.type < NF3REG ||
1190 			    res.resok.obj_attributes.attr.type > NF3FIFO) {
1191 #ifdef DEBUG
1192 				zcmn_err(getzoneid(), CE_WARN,
1193 			    "NFS3 server %s returned a bad file type for root",
1194 				    svp->sv_hostname);
1195 #else
1196 				zcmn_err(getzoneid(), CE_WARN,
1197 			    "NFS server %s returned a bad file type for root",
1198 				    svp->sv_hostname);
1199 #endif
1200 				error = EINVAL;
1201 				goto bad;
1202 			} else {
1203 				if (rtvp->v_type != VNON && rtvp->v_type !=
1204 				    nf3_to_vt[res.resok.obj_attributes.attr.
1205 				    type]) {
1206 #ifdef DEBUG
1207 					zcmn_err(getzoneid(), CE_WARN,
1208 		"NFS3 server %s returned a different file type for root",
1209 					    svp->sv_hostname);
1210 #else
1211 					zcmn_err(getzoneid(), CE_WARN,
1212 		"NFS server %s returned a different file type for root",
1213 					    svp->sv_hostname);
1214 #endif
1215 					error = EINVAL;
1216 					goto bad;
1217 				}
1218 				rtvp->v_type =
1219 				    nf3_to_vt[res.resok.obj_attributes.attr.
1220 				    type];
1221 			}
1222 		}
1223 
1224 		if (res.resok.rtmax != 0) {
1225 			mi->mi_tsize = MIN(res.resok.rtmax, mi->mi_tsize);
1226 			if (res.resok.rtpref != 0) {
1227 				mi->mi_curread = MIN(res.resok.rtpref,
1228 				    mi->mi_curread);
1229 			} else {
1230 				mi->mi_curread = MIN(res.resok.rtmax,
1231 				    mi->mi_curread);
1232 			}
1233 		} else if (res.resok.rtpref != 0) {
1234 			mi->mi_tsize = MIN(res.resok.rtpref, mi->mi_tsize);
1235 			mi->mi_curread = MIN(res.resok.rtpref, mi->mi_curread);
1236 		} else {
1237 #ifdef DEBUG
1238 			zcmn_err(getzoneid(), CE_WARN,
1239 			    "NFS3 server %s returned 0 for read transfer sizes",
1240 			    svp->sv_hostname);
1241 #else
1242 			zcmn_err(getzoneid(), CE_WARN,
1243 			    "NFS server %s returned 0 for read transfer sizes",
1244 			    svp->sv_hostname);
1245 #endif
1246 			error = EIO;
1247 			goto bad;
1248 		}
1249 		if (res.resok.wtmax != 0) {
1250 			mi->mi_stsize = MIN(res.resok.wtmax, mi->mi_stsize);
1251 			if (res.resok.wtpref != 0) {
1252 				mi->mi_curwrite = MIN(res.resok.wtpref,
1253 				    mi->mi_curwrite);
1254 			} else {
1255 				mi->mi_curwrite = MIN(res.resok.wtmax,
1256 				    mi->mi_curwrite);
1257 			}
1258 		} else if (res.resok.wtpref != 0) {
1259 			mi->mi_stsize = MIN(res.resok.wtpref, mi->mi_stsize);
1260 			mi->mi_curwrite = MIN(res.resok.wtpref,
1261 			    mi->mi_curwrite);
1262 		} else {
1263 #ifdef DEBUG
1264 			zcmn_err(getzoneid(), CE_WARN,
1265 			"NFS3 server %s returned 0 for write transfer sizes",
1266 			    svp->sv_hostname);
1267 #else
1268 			zcmn_err(getzoneid(), CE_WARN,
1269 			"NFS server %s returned 0 for write transfer sizes",
1270 			    svp->sv_hostname);
1271 #endif
1272 			error = EIO;
1273 			goto bad;
1274 		}
1275 
1276 		/*
1277 		 * These signal the ability of the server to create
1278 		 * hard links and symbolic links, so they really
1279 		 * aren't relevant if there is more than one server.
1280 		 * We'll set them here, though it probably looks odd.
1281 		 */
1282 		if (res.resok.properties & FSF3_LINK)
1283 			mi->mi_flags |= MI_LINK;
1284 		if (res.resok.properties & FSF3_SYMLINK)
1285 			mi->mi_flags |= MI_SYMLINK;
1286 
1287 		/* Pick up smallest non-zero maxfilesize value */
1288 		if (res.resok.maxfilesize) {
1289 			if (mi->mi_maxfilesize) {
1290 				mi->mi_maxfilesize = MIN(mi->mi_maxfilesize,
1291 				    res.resok.maxfilesize);
1292 			} else
1293 				mi->mi_maxfilesize = res.resok.maxfilesize;
1294 		}
1295 
1296 		/*
1297 		 * AUTH_F_TRYNONE is only for the mount operation,
1298 		 * so turn it back off.
1299 		 */
1300 		svp->sv_secdata->flags &= ~AUTH_F_TRYNONE;
1301 	}
1302 	mi->mi_curr_serv = mi->mi_servers;
1303 
1304 	/*
1305 	 * Start the thread responsible for handling async worker threads.
1306 	 */
1307 	VFS_HOLD(vfsp);	/* add reference for thread */
1308 	mi->mi_manager_thread = zthread_create(NULL, 0, nfs_async_manager,
1309 	    vfsp, 0, minclsyspri);
1310 	ASSERT(mi->mi_manager_thread != NULL);
1311 
1312 	/*
1313 	 * Initialize kstats
1314 	 */
1315 	nfs_mnt_kstat_init(vfsp);
1316 
1317 	/* If we didn't get a type, get one now */
1318 	if (rtvp->v_type == VNON) {
1319 		va.va_mask = AT_ALL;
1320 
1321 		error = nfs3getattr(rtvp, &va, tcr);
1322 		if (error)
1323 			goto bad;
1324 		rtvp->v_type = va.va_type;
1325 	}
1326 
1327 	mi->mi_type = rtvp->v_type;
1328 
1329 	*rtvpp = rtvp;
1330 	if (lcr != NULL)
1331 		crfree(lcr);
1332 
1333 	return (0);
1334 bad:
1335 	/*
1336 	 * An error occurred somewhere, need to clean up...
1337 	 * We need to release our reference to the root vnode and
1338 	 * destroy the mntinfo struct that we just created.
1339 	 */
1340 	if (lcr != NULL)
1341 		crfree(lcr);
1342 	rp = VTOR(rtvp);
1343 	if (rp->r_flags & RHASHED)
1344 		rp_rmhash(rp);
1345 	VN_RELE(rtvp);
1346 	nfs_async_stop(vfsp);
1347 	nfs_async_manager_stop(vfsp);
1348 	if (mi->mi_io_kstats) {
1349 		kstat_delete(mi->mi_io_kstats);
1350 		mi->mi_io_kstats = NULL;
1351 	}
1352 	if (mi->mi_ro_kstats) {
1353 		kstat_delete(mi->mi_ro_kstats);
1354 		mi->mi_ro_kstats = NULL;
1355 	}
1356 	nfs_free_mi(mi);
1357 	*rtvpp = NULL;
1358 	return (error);
1359 }
1360 
1361 /*
1362  * vfs operations
1363  */
1364 static int
nfs3_unmount(vfs_t * vfsp,int flag,cred_t * cr)1365 nfs3_unmount(vfs_t *vfsp, int flag, cred_t *cr)
1366 {
1367 	mntinfo_t *mi;
1368 	ushort_t omax;
1369 
1370 	if (secpolicy_fs_unmount(cr, vfsp) != 0)
1371 		return (EPERM);
1372 
1373 	mi = VFTOMI(vfsp);
1374 	if (flag & MS_FORCE) {
1375 
1376 		vfsp->vfs_flag |= VFS_UNMOUNTED;
1377 
1378 		/*
1379 		 * We are about to stop the async manager.
1380 		 * Let every one know not to schedule any
1381 		 * more async requests
1382 		 */
1383 		mutex_enter(&mi->mi_async_lock);
1384 		mi->mi_max_threads = 0;
1385 		NFS_WAKEALL_ASYNC_WORKERS(mi->mi_async_work_cv);
1386 		mutex_exit(&mi->mi_async_lock);
1387 
1388 		/*
1389 		 * We need to stop the manager thread explicitly; the worker
1390 		 * threads can time out and exit on their own.
1391 		 */
1392 		nfs_async_manager_stop(vfsp);
1393 		destroy_rtable(vfsp, cr);
1394 		if (mi->mi_io_kstats) {
1395 			kstat_delete(mi->mi_io_kstats);
1396 			mi->mi_io_kstats = NULL;
1397 		}
1398 		if (mi->mi_ro_kstats) {
1399 			kstat_delete(mi->mi_ro_kstats);
1400 			mi->mi_ro_kstats = NULL;
1401 		}
1402 		return (0);
1403 	}
1404 	/*
1405 	 * Wait until all asynchronous putpage operations on
1406 	 * this file system are complete before flushing rnodes
1407 	 * from the cache.
1408 	 */
1409 	omax = mi->mi_max_threads;
1410 	if (nfs_async_stop_sig(vfsp)) {
1411 		return (EINTR);
1412 	}
1413 	rflush(vfsp, cr);
1414 	/*
1415 	 * If there are any active vnodes on this file system,
1416 	 * then the file system is busy and can't be umounted.
1417 	 */
1418 	if (check_rtable(vfsp)) {
1419 		mutex_enter(&mi->mi_async_lock);
1420 		mi->mi_max_threads = omax;
1421 		mutex_exit(&mi->mi_async_lock);
1422 		return (EBUSY);
1423 	}
1424 	/*
1425 	 * The unmount can't fail from now on; stop the worker thread manager.
1426 	 */
1427 	nfs_async_manager_stop(vfsp);
1428 	/*
1429 	 * Destroy all rnodes belonging to this file system from the
1430 	 * rnode hash queues and purge any resources allocated to
1431 	 * them.
1432 	 */
1433 	destroy_rtable(vfsp, cr);
1434 	if (mi->mi_io_kstats) {
1435 		kstat_delete(mi->mi_io_kstats);
1436 		mi->mi_io_kstats = NULL;
1437 	}
1438 	if (mi->mi_ro_kstats) {
1439 		kstat_delete(mi->mi_ro_kstats);
1440 		mi->mi_ro_kstats = NULL;
1441 	}
1442 	return (0);
1443 }
1444 
1445 /*
1446  * find root of nfs
1447  */
1448 static int
nfs3_root(vfs_t * vfsp,vnode_t ** vpp)1449 nfs3_root(vfs_t *vfsp, vnode_t **vpp)
1450 {
1451 	mntinfo_t *mi;
1452 	vnode_t *vp;
1453 	servinfo_t *svp;
1454 	rnode_t *rp;
1455 	int error = 0;
1456 
1457 	mi = VFTOMI(vfsp);
1458 
1459 	if (nfs_zone() != mi->mi_zone)
1460 		return (EPERM);
1461 
1462 	svp = mi->mi_curr_serv;
1463 	if (svp && (svp->sv_flags & SV_ROOT_STALE)) {
1464 		mutex_enter(&svp->sv_lock);
1465 		svp->sv_flags &= ~SV_ROOT_STALE;
1466 		mutex_exit(&svp->sv_lock);
1467 		error = ENOENT;
1468 	}
1469 
1470 	vp = makenfs3node((nfs_fh3 *)&mi->mi_curr_serv->sv_fhandle,
1471 	    NULL, vfsp, gethrtime(), CRED(), NULL, NULL);
1472 
1473 	/*
1474 	 * if the SV_ROOT_STALE flag was reset above, reset the
1475 	 * RSTALE flag if needed and return an error
1476 	 */
1477 	if (error == ENOENT) {
1478 		rp = VTOR(vp);
1479 		if (svp && rp->r_flags & RSTALE) {
1480 			mutex_enter(&rp->r_statelock);
1481 			rp->r_flags &= ~RSTALE;
1482 			mutex_exit(&rp->r_statelock);
1483 		}
1484 		VN_RELE(vp);
1485 		return (error);
1486 	}
1487 
1488 	ASSERT(vp->v_type == VNON || vp->v_type == mi->mi_type);
1489 
1490 	vp->v_type = mi->mi_type;
1491 
1492 	*vpp = vp;
1493 
1494 	return (0);
1495 }
1496 
1497 /*
1498  * Get file system statistics.
1499  */
1500 static int
nfs3_statvfs(vfs_t * vfsp,struct statvfs64 * sbp)1501 nfs3_statvfs(vfs_t *vfsp, struct statvfs64 *sbp)
1502 {
1503 	int error;
1504 	struct mntinfo *mi;
1505 	struct FSSTAT3args args;
1506 	struct FSSTAT3res res;
1507 	int douprintf;
1508 	failinfo_t fi;
1509 	vnode_t *vp;
1510 	cred_t *cr;
1511 	hrtime_t t;
1512 
1513 	mi = VFTOMI(vfsp);
1514 	if (nfs_zone() != mi->mi_zone)
1515 		return (EPERM);
1516 	error = nfs3_root(vfsp, &vp);
1517 	if (error)
1518 		return (error);
1519 
1520 	cr = CRED();
1521 
1522 	args.fsroot = *VTOFH3(vp);
1523 	fi.vp = vp;
1524 	fi.fhp = (caddr_t)&args.fsroot;
1525 	fi.copyproc = nfs3copyfh;
1526 	fi.lookupproc = nfs3lookup;
1527 	fi.xattrdirproc = acl_getxattrdir3;
1528 
1529 	douprintf = 1;
1530 
1531 	t = gethrtime();
1532 
1533 	error = rfs3call(mi, NFSPROC3_FSSTAT,
1534 	    xdr_nfs_fh3, (caddr_t)&args,
1535 	    xdr_FSSTAT3res, (caddr_t)&res, cr,
1536 	    &douprintf, &res.status, 0, &fi);
1537 
1538 	if (error) {
1539 		VN_RELE(vp);
1540 		return (error);
1541 	}
1542 
1543 	error = geterrno3(res.status);
1544 	if (!error) {
1545 		nfs3_cache_post_op_attr(vp, &res.resok.obj_attributes, t, cr);
1546 		sbp->f_bsize = MAXBSIZE;
1547 		sbp->f_frsize = DEV_BSIZE;
1548 		/*
1549 		 * Allow -1 fields to pass through unconverted.  These
1550 		 * indicate "don't know" fields.
1551 		 */
1552 		if (res.resok.tbytes == (size3)-1)
1553 			sbp->f_blocks = (fsblkcnt64_t)res.resok.tbytes;
1554 		else {
1555 			sbp->f_blocks = (fsblkcnt64_t)
1556 			    (res.resok.tbytes / DEV_BSIZE);
1557 		}
1558 		if (res.resok.fbytes == (size3)-1)
1559 			sbp->f_bfree = (fsblkcnt64_t)res.resok.fbytes;
1560 		else {
1561 			sbp->f_bfree = (fsblkcnt64_t)
1562 			    (res.resok.fbytes / DEV_BSIZE);
1563 		}
1564 		if (res.resok.abytes == (size3)-1)
1565 			sbp->f_bavail = (fsblkcnt64_t)res.resok.abytes;
1566 		else {
1567 			sbp->f_bavail = (fsblkcnt64_t)
1568 			    (res.resok.abytes / DEV_BSIZE);
1569 		}
1570 		sbp->f_files = (fsfilcnt64_t)res.resok.tfiles;
1571 		sbp->f_ffree = (fsfilcnt64_t)res.resok.ffiles;
1572 		sbp->f_favail = (fsfilcnt64_t)res.resok.afiles;
1573 		sbp->f_fsid = (unsigned long)vfsp->vfs_fsid.val[0];
1574 		(void) strncpy(sbp->f_basetype,
1575 		    vfssw[vfsp->vfs_fstype].vsw_name, FSTYPSZ);
1576 		sbp->f_flag = vf_to_stf(vfsp->vfs_flag);
1577 		sbp->f_namemax = (ulong_t)-1;
1578 	} else {
1579 		nfs3_cache_post_op_attr(vp, &res.resfail.obj_attributes, t, cr);
1580 		PURGE_STALE_FH(error, vp, cr);
1581 	}
1582 
1583 	VN_RELE(vp);
1584 
1585 	return (error);
1586 }
1587 
1588 static kmutex_t nfs3_syncbusy;
1589 
1590 /*
1591  * Flush dirty nfs files for file system vfsp.
1592  * If vfsp == NULL, all nfs files are flushed.
1593  */
1594 /* ARGSUSED */
1595 static int
nfs3_sync(vfs_t * vfsp,short flag,cred_t * cr)1596 nfs3_sync(vfs_t *vfsp, short flag, cred_t *cr)
1597 {
1598 	/*
1599 	 * Cross-zone calls are OK here, since this translates to a
1600 	 * VOP_PUTPAGE(B_ASYNC), which gets picked up by the right zone.
1601 	 */
1602 	if (!(flag & SYNC_ATTR) && mutex_tryenter(&nfs3_syncbusy) != 0) {
1603 		rflush(vfsp, cr);
1604 		mutex_exit(&nfs3_syncbusy);
1605 	}
1606 	return (0);
1607 }
1608 
1609 /* ARGSUSED */
1610 static int
nfs3_vget(vfs_t * vfsp,vnode_t ** vpp,fid_t * fidp)1611 nfs3_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp)
1612 {
1613 	int error;
1614 	nfs_fh3 fh;
1615 	vnode_t *vp;
1616 	struct vattr va;
1617 
1618 	if (fidp->fid_len > NFS3_FHSIZE) {
1619 		*vpp = NULL;
1620 		return (ESTALE);
1621 	}
1622 
1623 	if (nfs_zone() != VFTOMI(vfsp)->mi_zone)
1624 		return (EPERM);
1625 	fh.fh3_length = fidp->fid_len;
1626 	bcopy(fidp->fid_data, fh.fh3_u.data, fh.fh3_length);
1627 
1628 	vp = makenfs3node(&fh, NULL, vfsp, gethrtime(), CRED(), NULL, NULL);
1629 
1630 	if (VTOR(vp)->r_flags & RSTALE) {
1631 		VN_RELE(vp);
1632 		*vpp = NULL;
1633 		return (ENOENT);
1634 	}
1635 
1636 	if (vp->v_type == VNON) {
1637 		va.va_mask = AT_ALL;
1638 		error = nfs3getattr(vp, &va, CRED());
1639 		if (error) {
1640 			VN_RELE(vp);
1641 			*vpp = NULL;
1642 			return (error);
1643 		}
1644 		vp->v_type = va.va_type;
1645 	}
1646 
1647 	*vpp = vp;
1648 
1649 	return (0);
1650 }
1651 
1652 /* ARGSUSED */
1653 static int
nfs3_mountroot(vfs_t * vfsp,whymountroot_t why)1654 nfs3_mountroot(vfs_t *vfsp, whymountroot_t why)
1655 {
1656 	vnode_t *rtvp;
1657 	char root_hostname[SYS_NMLN+1];
1658 	struct servinfo *svp;
1659 	int error;
1660 	int vfsflags;
1661 	size_t size;
1662 	char *root_path;
1663 	struct pathname pn;
1664 	char *name;
1665 	cred_t *cr;
1666 	struct nfs_args args;		/* nfs mount arguments */
1667 	static char token[10];
1668 
1669 	bzero(&args, sizeof (args));
1670 
1671 	/* do this BEFORE getfile which causes xid stamps to be initialized */
1672 	clkset(-1L);		/* hack for now - until we get time svc? */
1673 
1674 	if (why == ROOT_REMOUNT) {
1675 		/*
1676 		 * Shouldn't happen.
1677 		 */
1678 		panic("nfs3_mountroot: why == ROOT_REMOUNT");
1679 	}
1680 
1681 	if (why == ROOT_UNMOUNT) {
1682 		/*
1683 		 * Nothing to do for NFS.
1684 		 */
1685 		return (0);
1686 	}
1687 
1688 	/*
1689 	 * why == ROOT_INIT
1690 	 */
1691 
1692 	name = token;
1693 	*name = 0;
1694 	getfsname("root", name, sizeof (token));
1695 
1696 	pn_alloc(&pn);
1697 	root_path = pn.pn_path;
1698 
1699 	svp = kmem_zalloc(sizeof (*svp), KM_SLEEP);
1700 	svp->sv_knconf = kmem_zalloc(sizeof (*svp->sv_knconf), KM_SLEEP);
1701 	svp->sv_knconf->knc_protofmly = kmem_alloc(KNC_STRSIZE, KM_SLEEP);
1702 	svp->sv_knconf->knc_proto = kmem_alloc(KNC_STRSIZE, KM_SLEEP);
1703 
1704 	/*
1705 	 * Get server address
1706 	 * Get the root fhandle
1707 	 * Get server's transport
1708 	 * Get server's hostname
1709 	 * Get options
1710 	 */
1711 	args.addr = &svp->sv_addr;
1712 	args.fh = (char *)&svp->sv_fhandle;
1713 	args.knconf = svp->sv_knconf;
1714 	args.hostname = root_hostname;
1715 	vfsflags = 0;
1716 	if (error = mount_root(*name ? name : "root", root_path, NFS_V3,
1717 	    &args, &vfsflags)) {
1718 		if (error == EPROTONOSUPPORT)
1719 			nfs_cmn_err(error, CE_WARN, "nfs3_mountroot: "
1720 			    "mount_root failed: server doesn't support NFS V3");
1721 		else
1722 			nfs_cmn_err(error, CE_WARN,
1723 			    "nfs3_mountroot: mount_root failed: %m");
1724 		sv_free(svp);
1725 		pn_free(&pn);
1726 		return (error);
1727 	}
1728 	svp->sv_hostnamelen = (int)(strlen(root_hostname) + 1);
1729 	svp->sv_hostname = kmem_alloc(svp->sv_hostnamelen, KM_SLEEP);
1730 	(void) strcpy(svp->sv_hostname, root_hostname);
1731 
1732 	/*
1733 	 * Force root partition to always be mounted with AUTH_UNIX for now
1734 	 */
1735 	svp->sv_secdata = kmem_alloc(sizeof (*svp->sv_secdata), KM_SLEEP);
1736 	svp->sv_secdata->secmod = AUTH_UNIX;
1737 	svp->sv_secdata->rpcflavor = AUTH_UNIX;
1738 	svp->sv_secdata->data = NULL;
1739 
1740 	cr = crgetcred();
1741 	rtvp = NULL;
1742 
1743 	error = nfs3rootvp(&rtvp, vfsp, svp, args.flags, cr, global_zone);
1744 
1745 	crfree(cr);
1746 
1747 	if (error) {
1748 		pn_free(&pn);
1749 		sv_free(svp);
1750 		return (error);
1751 	}
1752 
1753 	error = nfs_setopts(rtvp, DATAMODEL_NATIVE, &args);
1754 	if (error) {
1755 		nfs_cmn_err(error, CE_WARN,
1756 		    "nfs3_mountroot: invalid root mount options");
1757 		pn_free(&pn);
1758 		goto errout;
1759 	}
1760 
1761 	(void) vfs_lock_wait(vfsp);
1762 	vfs_add(NULL, vfsp, vfsflags);
1763 	vfs_unlock(vfsp);
1764 
1765 	size = strlen(svp->sv_hostname);
1766 	(void) strcpy(rootfs.bo_name, svp->sv_hostname);
1767 	rootfs.bo_name[size] = ':';
1768 	(void) strcpy(&rootfs.bo_name[size + 1], root_path);
1769 
1770 	pn_free(&pn);
1771 
1772 errout:
1773 	if (error) {
1774 		sv_free(svp);
1775 		nfs_async_stop(vfsp);
1776 		nfs_async_manager_stop(vfsp);
1777 	}
1778 
1779 	if (rtvp != NULL)
1780 		VN_RELE(rtvp);
1781 
1782 	return (error);
1783 }
1784 
1785 /*
1786  * Initialization routine for VFS routines.  Should only be called once
1787  */
1788 int
nfs3_vfsinit(void)1789 nfs3_vfsinit(void)
1790 {
1791 	mutex_init(&nfs3_syncbusy, NULL, MUTEX_DEFAULT, NULL);
1792 	return (0);
1793 }
1794 
1795 void
nfs3_vfsfini(void)1796 nfs3_vfsfini(void)
1797 {
1798 	mutex_destroy(&nfs3_syncbusy);
1799 }
1800 
1801 void
nfs3_freevfs(vfs_t * vfsp)1802 nfs3_freevfs(vfs_t *vfsp)
1803 {
1804 	mntinfo_t *mi;
1805 	servinfo_t *svp;
1806 
1807 	/* free up the resources */
1808 	mi = VFTOMI(vfsp);
1809 	svp = mi->mi_servers;
1810 	mi->mi_servers = mi->mi_curr_serv = NULL;
1811 	sv_free(svp);
1812 
1813 	/*
1814 	 * By this time we should have already deleted the
1815 	 * mi kstats in the unmount code. If they are still around
1816 	 * somethings wrong
1817 	 */
1818 	ASSERT(mi->mi_io_kstats == NULL);
1819 	nfs_free_mi(mi);
1820 }
1821