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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/nfs/super.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 * Split from inode.c by David Howells <dhowells@redhat.com>
16 *
17 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
18 * particular server are held in the same superblock
19 * - NFS superblocks can have several effective roots to the dentry tree
20 * - directory type roots are spliced into the tree when a path from one root reaches the root
21 * of another (see nfs_lookup())
22 */
23
24#include <linux/module.h>
25#include <linux/init.h>
26
27#include <linux/time.h>
28#include <linux/kernel.h>
29#include <linux/mm.h>
30#include <linux/string.h>
31#include <linux/stat.h>
32#include <linux/errno.h>
33#include <linux/unistd.h>
34#include <linux/sunrpc/clnt.h>
35#include <linux/sunrpc/addr.h>
36#include <linux/sunrpc/stats.h>
37#include <linux/sunrpc/metrics.h>
38#include <linux/sunrpc/xprtsock.h>
39#include <linux/sunrpc/xprtrdma.h>
40#include <linux/nfs_fs.h>
41#include <linux/nfs_mount.h>
42#include <linux/nfs4_mount.h>
43#include <linux/lockd/bind.h>
44#include <linux/seq_file.h>
45#include <linux/mount.h>
46#include <linux/namei.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
49#include <linux/in6.h>
50#include <linux/slab.h>
51#include <net/ipv6.h>
52#include <linux/netdevice.h>
53#include <linux/nfs_xdr.h>
54#include <linux/magic.h>
55#include <linux/parser.h>
56#include <linux/nsproxy.h>
57#include <linux/rcupdate.h>
58
59#include <linux/uaccess.h>
60#include <linux/nfs_ssc.h>
61
62#include <uapi/linux/tls.h>
63
64#include "nfs4_fs.h"
65#include "callback.h"
66#include "delegation.h"
67#include "iostat.h"
68#include "internal.h"
69#include "fscache.h"
70#include "nfs4session.h"
71#include "pnfs.h"
72#include "nfs.h"
73#include "netns.h"
74#include "sysfs.h"
75
76#define NFSDBG_FACILITY NFSDBG_VFS
77
78const struct super_operations nfs_sops = {
79 .alloc_inode = nfs_alloc_inode,
80 .free_inode = nfs_free_inode,
81 .write_inode = nfs_write_inode,
82 .drop_inode = nfs_drop_inode,
83 .statfs = nfs_statfs,
84 .evict_inode = nfs_evict_inode,
85 .umount_begin = nfs_umount_begin,
86 .show_options = nfs_show_options,
87 .show_devname = nfs_show_devname,
88 .show_path = nfs_show_path,
89 .show_stats = nfs_show_stats,
90};
91EXPORT_SYMBOL_GPL(nfs_sops);
92
93#ifdef CONFIG_NFS_V4_2
94static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = {
95 .sco_sb_deactive = nfs_sb_deactive,
96};
97#endif
98
99#if IS_ENABLED(CONFIG_NFS_V4)
100static int __init register_nfs4_fs(void)
101{
102 return register_filesystem(&nfs4_fs_type);
103}
104
105static void unregister_nfs4_fs(void)
106{
107 unregister_filesystem(&nfs4_fs_type);
108}
109#else
110static int __init register_nfs4_fs(void)
111{
112 return 0;
113}
114
115static void unregister_nfs4_fs(void)
116{
117}
118#endif
119
120#ifdef CONFIG_NFS_V4_2
121static void nfs_ssc_register_ops(void)
122{
123 nfs_ssc_register(&nfs_ssc_clnt_ops_tbl);
124}
125
126static void nfs_ssc_unregister_ops(void)
127{
128 nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl);
129}
130#endif /* CONFIG_NFS_V4_2 */
131
132static struct shrinker *acl_shrinker;
133
134/*
135 * Register the NFS filesystems
136 */
137int __init register_nfs_fs(void)
138{
139 int ret;
140
141 ret = register_filesystem(&nfs_fs_type);
142 if (ret < 0)
143 goto error_0;
144
145 ret = register_nfs4_fs();
146 if (ret < 0)
147 goto error_1;
148
149 ret = nfs_register_sysctl();
150 if (ret < 0)
151 goto error_2;
152
153 acl_shrinker = shrinker_alloc(0, "nfs-acl");
154 if (!acl_shrinker) {
155 ret = -ENOMEM;
156 goto error_3;
157 }
158
159 acl_shrinker->count_objects = nfs_access_cache_count;
160 acl_shrinker->scan_objects = nfs_access_cache_scan;
161
162 shrinker_register(acl_shrinker);
163
164#ifdef CONFIG_NFS_V4_2
165 nfs_ssc_register_ops();
166#endif
167 return 0;
168error_3:
169 nfs_unregister_sysctl();
170error_2:
171 unregister_nfs4_fs();
172error_1:
173 unregister_filesystem(&nfs_fs_type);
174error_0:
175 return ret;
176}
177
178/*
179 * Unregister the NFS filesystems
180 */
181void __exit unregister_nfs_fs(void)
182{
183 shrinker_free(acl_shrinker);
184 nfs_unregister_sysctl();
185 unregister_nfs4_fs();
186#ifdef CONFIG_NFS_V4_2
187 nfs_ssc_unregister_ops();
188#endif
189 unregister_filesystem(&nfs_fs_type);
190}
191
192bool nfs_sb_active(struct super_block *sb)
193{
194 struct nfs_server *server = NFS_SB(sb);
195
196 if (!atomic_inc_not_zero(&sb->s_active))
197 return false;
198 if (atomic_inc_return(&server->active) != 1)
199 atomic_dec(&sb->s_active);
200 return true;
201}
202EXPORT_SYMBOL_GPL(nfs_sb_active);
203
204void nfs_sb_deactive(struct super_block *sb)
205{
206 struct nfs_server *server = NFS_SB(sb);
207
208 if (atomic_dec_and_test(&server->active))
209 deactivate_super(sb);
210}
211EXPORT_SYMBOL_GPL(nfs_sb_deactive);
212
213static int __nfs_list_for_each_server(struct list_head *head,
214 int (*fn)(struct nfs_server *, void *),
215 void *data)
216{
217 struct nfs_server *server, *last = NULL;
218 int ret = 0;
219
220 rcu_read_lock();
221 list_for_each_entry_rcu(server, head, client_link) {
222 if (!(server->super && nfs_sb_active(server->super)))
223 continue;
224 rcu_read_unlock();
225 if (last)
226 nfs_sb_deactive(last->super);
227 last = server;
228 ret = fn(server, data);
229 if (ret)
230 goto out;
231 rcu_read_lock();
232 }
233 rcu_read_unlock();
234out:
235 if (last)
236 nfs_sb_deactive(last->super);
237 return ret;
238}
239
240int nfs_client_for_each_server(struct nfs_client *clp,
241 int (*fn)(struct nfs_server *, void *),
242 void *data)
243{
244 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data);
245}
246EXPORT_SYMBOL_GPL(nfs_client_for_each_server);
247
248/*
249 * Deliver file system statistics to userspace
250 */
251int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
252{
253 struct nfs_server *server = NFS_SB(dentry->d_sb);
254 unsigned char blockbits;
255 unsigned long blockres;
256 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
257 struct nfs_fsstat res;
258 int error = -ENOMEM;
259
260 res.fattr = nfs_alloc_fattr();
261 if (res.fattr == NULL)
262 goto out_err;
263
264 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
265 if (unlikely(error == -ESTALE)) {
266 struct dentry *pd_dentry;
267
268 pd_dentry = dget_parent(dentry);
269 nfs_zap_caches(d_inode(pd_dentry));
270 dput(pd_dentry);
271 }
272 nfs_free_fattr(res.fattr);
273 if (error < 0)
274 goto out_err;
275
276 buf->f_type = NFS_SUPER_MAGIC;
277
278 /*
279 * Current versions of glibc do not correctly handle the
280 * case where f_frsize != f_bsize. Eventually we want to
281 * report the value of wtmult in this field.
282 */
283 buf->f_frsize = dentry->d_sb->s_blocksize;
284
285 /*
286 * On most *nix systems, f_blocks, f_bfree, and f_bavail
287 * are reported in units of f_frsize. Linux hasn't had
288 * an f_frsize field in its statfs struct until recently,
289 * thus historically Linux's sys_statfs reports these
290 * fields in units of f_bsize.
291 */
292 buf->f_bsize = dentry->d_sb->s_blocksize;
293 blockbits = dentry->d_sb->s_blocksize_bits;
294 blockres = (1 << blockbits) - 1;
295 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
296 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
297 buf->f_bavail = (res.abytes + blockres) >> blockbits;
298
299 buf->f_files = res.tfiles;
300 buf->f_ffree = res.afiles;
301
302 buf->f_namelen = server->namelen;
303
304 return 0;
305
306 out_err:
307 dprintk("%s: statfs error = %d\n", __func__, -error);
308 return error;
309}
310EXPORT_SYMBOL_GPL(nfs_statfs);
311
312/*
313 * Map the security flavour number to a name
314 */
315static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
316{
317 static const struct {
318 rpc_authflavor_t flavour;
319 const char *str;
320 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
321 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
322 { RPC_AUTH_NULL, "null" },
323 { RPC_AUTH_UNIX, "sys" },
324 { RPC_AUTH_GSS_KRB5, "krb5" },
325 { RPC_AUTH_GSS_KRB5I, "krb5i" },
326 { RPC_AUTH_GSS_KRB5P, "krb5p" },
327 { RPC_AUTH_GSS_LKEY, "lkey" },
328 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
329 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
330 { RPC_AUTH_GSS_SPKM, "spkm" },
331 { RPC_AUTH_GSS_SPKMI, "spkmi" },
332 { RPC_AUTH_GSS_SPKMP, "spkmp" },
333 { UINT_MAX, "unknown" }
334 };
335 int i;
336
337 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
338 if (sec_flavours[i].flavour == flavour)
339 break;
340 }
341 return sec_flavours[i].str;
342}
343
344static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
345 int showdefaults)
346{
347 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
348 char *proto = NULL;
349
350 switch (sap->sa_family) {
351 case AF_INET:
352 switch (nfss->mountd_protocol) {
353 case IPPROTO_UDP:
354 proto = RPCBIND_NETID_UDP;
355 break;
356 case IPPROTO_TCP:
357 proto = RPCBIND_NETID_TCP;
358 break;
359 }
360 break;
361 case AF_INET6:
362 switch (nfss->mountd_protocol) {
363 case IPPROTO_UDP:
364 proto = RPCBIND_NETID_UDP6;
365 break;
366 case IPPROTO_TCP:
367 proto = RPCBIND_NETID_TCP6;
368 break;
369 }
370 break;
371 }
372 if (proto || showdefaults)
373 seq_printf(m, ",mountproto=%s", proto ?: "auto");
374}
375
376static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
377 int showdefaults)
378{
379 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
380
381 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
382 return;
383
384 switch (sap->sa_family) {
385 case AF_INET: {
386 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
387 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
388 break;
389 }
390 case AF_INET6: {
391 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
392 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
393 break;
394 }
395 default:
396 if (showdefaults)
397 seq_puts(m, ",mountaddr=unspecified");
398 }
399
400 if (nfss->mountd_version || showdefaults)
401 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
402 if ((nfss->mountd_port &&
403 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
404 showdefaults)
405 seq_printf(m, ",mountport=%u", nfss->mountd_port);
406
407 nfs_show_mountd_netid(m, nfss, showdefaults);
408}
409
410#if IS_ENABLED(CONFIG_NFS_V4)
411static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
412 int showdefaults)
413{
414 struct nfs_client *clp = nfss->nfs_client;
415
416 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
417}
418#else
419static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
420 int showdefaults)
421{
422}
423#endif
424
425static void nfs_show_nfs_version(struct seq_file *m,
426 unsigned int version,
427 unsigned int minorversion)
428{
429 seq_printf(m, ",vers=%u", version);
430 if (version == 4)
431 seq_printf(m, ".%u", minorversion);
432}
433
434/*
435 * Describe the mount options in force on this server representation
436 */
437static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
438 int showdefaults)
439{
440 static const struct proc_nfs_info {
441 int flag;
442 const char *str;
443 const char *nostr;
444 } nfs_info[] = {
445 { NFS_MOUNT_SOFT, ",soft", "" },
446 { NFS_MOUNT_SOFTERR, ",softerr", "" },
447 { NFS_MOUNT_SOFTREVAL, ",softreval", "" },
448 { NFS_MOUNT_POSIX, ",posix", "" },
449 { NFS_MOUNT_NOCTO, ",nocto", "" },
450 { NFS_MOUNT_NOAC, ",noac", "" },
451 { NFS_MOUNT_NONLM, ",nolock", "" },
452 { NFS_MOUNT_NOACL, ",noacl", "" },
453 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
454 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
455 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
456 { 0, NULL, NULL }
457 };
458 const struct proc_nfs_info *nfs_infop;
459 struct nfs_client *clp = nfss->nfs_client;
460 u32 version = clp->rpc_ops->version;
461 int local_flock, local_fcntl;
462
463 nfs_show_nfs_version(m, version, clp->cl_minorversion);
464 seq_printf(m, ",rsize=%u", nfss->rsize);
465 seq_printf(m, ",wsize=%u", nfss->wsize);
466 if (nfss->bsize != 0)
467 seq_printf(m, ",bsize=%u", nfss->bsize);
468 seq_printf(m, ",namlen=%u", nfss->namelen);
469 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
470 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
471 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
472 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
473 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
474 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
475 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
476 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
477 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
478 seq_puts(m, ",hard");
479 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
480 if (nfss->flags & nfs_infop->flag)
481 seq_puts(m, nfs_infop->str);
482 else
483 seq_puts(m, nfs_infop->nostr);
484 }
485 rcu_read_lock();
486 seq_printf(m, ",proto=%s",
487 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
488 rcu_read_unlock();
489 if (clp->cl_nconnect > 0)
490 seq_printf(m, ",nconnect=%u", clp->cl_nconnect);
491 if (version == 4) {
492 if (clp->cl_max_connect > 1)
493 seq_printf(m, ",max_connect=%u", clp->cl_max_connect);
494 if (nfss->port != NFS_PORT)
495 seq_printf(m, ",port=%u", nfss->port);
496 } else
497 if (nfss->port)
498 seq_printf(m, ",port=%u", nfss->port);
499
500 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
501 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
502 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
503 switch (clp->cl_xprtsec.policy) {
504 case RPC_XPRTSEC_TLS_ANON:
505 seq_puts(m, ",xprtsec=tls");
506 break;
507 case RPC_XPRTSEC_TLS_X509:
508 seq_puts(m, ",xprtsec=mtls");
509 break;
510 default:
511 break;
512 }
513
514 if (version != 4)
515 nfs_show_mountd_options(m, nfss, showdefaults);
516 else
517 nfs_show_nfsv4_options(m, nfss, showdefaults);
518
519 if (nfss->options & NFS_OPTION_FSCACHE) {
520#ifdef CONFIG_NFS_FSCACHE
521 if (nfss->fscache_uniq)
522 seq_printf(m, ",fsc=%s", nfss->fscache_uniq);
523 else
524 seq_puts(m, ",fsc");
525#else
526 seq_puts(m, ",fsc");
527#endif
528 }
529
530 if (nfss->options & NFS_OPTION_MIGRATION)
531 seq_puts(m, ",migration");
532
533 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
534 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
535 seq_puts(m, ",lookupcache=none");
536 else
537 seq_puts(m, ",lookupcache=pos");
538 }
539
540 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
541 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
542
543 if (!local_flock && !local_fcntl)
544 seq_puts(m, ",local_lock=none");
545 else if (local_flock && local_fcntl)
546 seq_puts(m, ",local_lock=all");
547 else if (local_flock)
548 seq_puts(m, ",local_lock=flock");
549 else
550 seq_puts(m, ",local_lock=posix");
551
552 if (nfss->flags & NFS_MOUNT_WRITE_EAGER) {
553 if (nfss->flags & NFS_MOUNT_WRITE_WAIT)
554 seq_puts(m, ",write=wait");
555 else
556 seq_puts(m, ",write=eager");
557 }
558}
559
560/*
561 * Describe the mount options on this VFS mountpoint
562 */
563int nfs_show_options(struct seq_file *m, struct dentry *root)
564{
565 struct nfs_server *nfss = NFS_SB(root->d_sb);
566
567 nfs_show_mount_options(m, nfss, 0);
568
569 rcu_read_lock();
570 seq_printf(m, ",addr=%s",
571 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
572 RPC_DISPLAY_ADDR));
573 rcu_read_unlock();
574
575 return 0;
576}
577EXPORT_SYMBOL_GPL(nfs_show_options);
578
579#if IS_ENABLED(CONFIG_NFS_V4)
580static void show_lease(struct seq_file *m, struct nfs_server *server)
581{
582 struct nfs_client *clp = server->nfs_client;
583 unsigned long expire;
584
585 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ);
586 expire = clp->cl_last_renewal + clp->cl_lease_time;
587 seq_printf(m, ",lease_expired=%ld",
588 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ);
589}
590#ifdef CONFIG_NFS_V4_1
591static void show_sessions(struct seq_file *m, struct nfs_server *server)
592{
593 if (nfs4_has_session(server->nfs_client))
594 seq_puts(m, ",sessions");
595}
596#else
597static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
598#endif
599#endif
600
601#ifdef CONFIG_NFS_V4_1
602static void show_pnfs(struct seq_file *m, struct nfs_server *server)
603{
604 seq_printf(m, ",pnfs=");
605 if (server->pnfs_curr_ld)
606 seq_printf(m, "%s", server->pnfs_curr_ld->name);
607 else
608 seq_printf(m, "not configured");
609}
610
611static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
612{
613 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
614 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
615 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
616 "date='%llu,%u'",
617 impl_id->name, impl_id->domain,
618 impl_id->date.seconds, impl_id->date.nseconds);
619 }
620}
621#else
622#if IS_ENABLED(CONFIG_NFS_V4)
623static void show_pnfs(struct seq_file *m, struct nfs_server *server)
624{
625}
626#endif
627static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
628{
629}
630#endif
631
632int nfs_show_devname(struct seq_file *m, struct dentry *root)
633{
634 char *page = (char *) __get_free_page(GFP_KERNEL);
635 char *devname, *dummy;
636 int err = 0;
637 if (!page)
638 return -ENOMEM;
639 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
640 if (IS_ERR(devname))
641 err = PTR_ERR(devname);
642 else
643 seq_escape(m, devname, " \t\n\\");
644 free_page((unsigned long)page);
645 return err;
646}
647EXPORT_SYMBOL_GPL(nfs_show_devname);
648
649int nfs_show_path(struct seq_file *m, struct dentry *dentry)
650{
651 seq_puts(m, "/");
652 return 0;
653}
654EXPORT_SYMBOL_GPL(nfs_show_path);
655
656/*
657 * Present statistical information for this VFS mountpoint
658 */
659int nfs_show_stats(struct seq_file *m, struct dentry *root)
660{
661 int i, cpu;
662 struct nfs_server *nfss = NFS_SB(root->d_sb);
663 struct rpc_auth *auth = nfss->client->cl_auth;
664 struct nfs_iostats totals = { };
665
666 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
667
668 /*
669 * Display all mount option settings
670 */
671 seq_puts(m, "\n\topts:\t");
672 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
673 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
674 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
675 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
676 nfs_show_mount_options(m, nfss, 1);
677
678 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
679
680 show_implementation_id(m, nfss);
681
682 seq_puts(m, "\n\tcaps:\t");
683 seq_printf(m, "caps=0x%x", nfss->caps);
684 seq_printf(m, ",wtmult=%u", nfss->wtmult);
685 seq_printf(m, ",dtsize=%u", nfss->dtsize);
686 seq_printf(m, ",bsize=%u", nfss->bsize);
687 seq_printf(m, ",namlen=%u", nfss->namelen);
688
689#if IS_ENABLED(CONFIG_NFS_V4)
690 if (nfss->nfs_client->rpc_ops->version == 4) {
691 seq_puts(m, "\n\tnfsv4:\t");
692 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
693 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
694 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
695 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
696 show_sessions(m, nfss);
697 show_pnfs(m, nfss);
698 show_lease(m, nfss);
699 }
700#endif
701
702 /*
703 * Display security flavor in effect for this mount
704 */
705 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
706 if (auth->au_flavor)
707 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
708
709 /*
710 * Display superblock I/O counters
711 */
712 for_each_possible_cpu(cpu) {
713 struct nfs_iostats *stats;
714
715 preempt_disable();
716 stats = per_cpu_ptr(nfss->io_stats, cpu);
717
718 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
719 totals.events[i] += stats->events[i];
720 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
721 totals.bytes[i] += stats->bytes[i];
722
723 preempt_enable();
724 }
725
726 seq_puts(m, "\n\tevents:\t");
727 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
728 seq_printf(m, "%lu ", totals.events[i]);
729 seq_puts(m, "\n\tbytes:\t");
730 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
731 seq_printf(m, "%Lu ", totals.bytes[i]);
732 seq_putc(m, '\n');
733
734 rpc_clnt_show_stats(m, nfss->client);
735
736 return 0;
737}
738EXPORT_SYMBOL_GPL(nfs_show_stats);
739
740/*
741 * Begin unmount by attempting to remove all automounted mountpoints we added
742 * in response to xdev traversals and referrals
743 */
744void nfs_umount_begin(struct super_block *sb)
745{
746 struct nfs_server *server;
747 struct rpc_clnt *rpc;
748
749 server = NFS_SB(sb);
750 /* -EIO all pending I/O */
751 rpc = server->client_acl;
752 if (!IS_ERR(rpc))
753 rpc_killall_tasks(rpc);
754 rpc = server->client;
755 if (!IS_ERR(rpc))
756 rpc_killall_tasks(rpc);
757}
758EXPORT_SYMBOL_GPL(nfs_umount_begin);
759
760/*
761 * Return true if 'match' is in auth_info or auth_info is empty.
762 * Return false otherwise.
763 */
764bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
765 rpc_authflavor_t match)
766{
767 int i;
768
769 if (!auth_info->flavor_len)
770 return true;
771
772 for (i = 0; i < auth_info->flavor_len; i++) {
773 if (auth_info->flavors[i] == match)
774 return true;
775 }
776 return false;
777}
778EXPORT_SYMBOL_GPL(nfs_auth_info_match);
779
780/*
781 * Ensure that a specified authtype in ctx->auth_info is supported by
782 * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and
783 * -EACCES if not.
784 */
785static int nfs_verify_authflavors(struct nfs_fs_context *ctx,
786 rpc_authflavor_t *server_authlist,
787 unsigned int count)
788{
789 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
790 bool found_auth_null = false;
791 unsigned int i;
792
793 /*
794 * If the sec= mount option is used, the specified flavor or AUTH_NULL
795 * must be in the list returned by the server.
796 *
797 * AUTH_NULL has a special meaning when it's in the server list - it
798 * means that the server will ignore the rpc creds, so any flavor
799 * can be used but still use the sec= that was specified.
800 *
801 * Note also that the MNT procedure in MNTv1 does not return a list
802 * of supported security flavors. In this case, nfs_mount() fabricates
803 * a security flavor list containing just AUTH_NULL.
804 */
805 for (i = 0; i < count; i++) {
806 flavor = server_authlist[i];
807
808 if (nfs_auth_info_match(&ctx->auth_info, flavor))
809 goto out;
810
811 if (flavor == RPC_AUTH_NULL)
812 found_auth_null = true;
813 }
814
815 if (found_auth_null) {
816 flavor = ctx->auth_info.flavors[0];
817 goto out;
818 }
819
820 dfprintk(MOUNT,
821 "NFS: specified auth flavors not supported by server\n");
822 return -EACCES;
823
824out:
825 ctx->selected_flavor = flavor;
826 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor);
827 return 0;
828}
829
830/*
831 * Use the remote server's MOUNT service to request the NFS file handle
832 * corresponding to the provided path.
833 */
834static int nfs_request_mount(struct fs_context *fc,
835 struct nfs_fh *root_fh,
836 rpc_authflavor_t *server_authlist,
837 unsigned int *server_authlist_len)
838{
839 struct nfs_fs_context *ctx = nfs_fc2context(fc);
840 struct nfs_mount_request request = {
841 .sap = &ctx->mount_server._address,
842 .dirpath = ctx->nfs_server.export_path,
843 .protocol = ctx->mount_server.protocol,
844 .fh = root_fh,
845 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT,
846 .auth_flav_len = server_authlist_len,
847 .auth_flavs = server_authlist,
848 .net = fc->net_ns,
849 };
850 int status;
851
852 if (ctx->mount_server.version == 0) {
853 switch (ctx->version) {
854 default:
855 ctx->mount_server.version = NFS_MNT3_VERSION;
856 break;
857 case 2:
858 ctx->mount_server.version = NFS_MNT_VERSION;
859 }
860 }
861 request.version = ctx->mount_server.version;
862
863 if (ctx->mount_server.hostname)
864 request.hostname = ctx->mount_server.hostname;
865 else
866 request.hostname = ctx->nfs_server.hostname;
867
868 /*
869 * Construct the mount server's address.
870 */
871 if (ctx->mount_server.address.sa_family == AF_UNSPEC) {
872 memcpy(request.sap, &ctx->nfs_server._address,
873 ctx->nfs_server.addrlen);
874 ctx->mount_server.addrlen = ctx->nfs_server.addrlen;
875 }
876 request.salen = ctx->mount_server.addrlen;
877 nfs_set_port(request.sap, &ctx->mount_server.port, 0);
878
879 /*
880 * Now ask the mount server to map our export path
881 * to a file handle.
882 */
883 status = nfs_mount(&request, ctx->timeo, ctx->retrans);
884 if (status != 0) {
885 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
886 request.hostname, status);
887 return status;
888 }
889
890 return 0;
891}
892
893static struct nfs_server *nfs_try_mount_request(struct fs_context *fc)
894{
895 struct nfs_fs_context *ctx = nfs_fc2context(fc);
896 int status;
897 unsigned int i;
898 bool tried_auth_unix = false;
899 bool auth_null_in_list = false;
900 struct nfs_server *server = ERR_PTR(-EACCES);
901 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
902 unsigned int authlist_len = ARRAY_SIZE(authlist);
903
904 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len);
905 if (status)
906 return ERR_PTR(status);
907
908 /*
909 * Was a sec= authflavor specified in the options? First, verify
910 * whether the server supports it, and then just try to use it if so.
911 */
912 if (ctx->auth_info.flavor_len > 0) {
913 status = nfs_verify_authflavors(ctx, authlist, authlist_len);
914 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
915 ctx->selected_flavor);
916 if (status)
917 return ERR_PTR(status);
918 return ctx->nfs_mod->rpc_ops->create_server(fc);
919 }
920
921 /*
922 * No sec= option was provided. RFC 2623, section 2.7 suggests we
923 * SHOULD prefer the flavor listed first. However, some servers list
924 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
925 */
926 for (i = 0; i < authlist_len; ++i) {
927 rpc_authflavor_t flavor;
928 struct rpcsec_gss_info info;
929
930 flavor = authlist[i];
931 switch (flavor) {
932 case RPC_AUTH_UNIX:
933 tried_auth_unix = true;
934 break;
935 case RPC_AUTH_NULL:
936 auth_null_in_list = true;
937 continue;
938 default:
939 if (rpcauth_get_gssinfo(flavor, &info) != 0)
940 continue;
941 break;
942 }
943 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
944 ctx->selected_flavor = flavor;
945 server = ctx->nfs_mod->rpc_ops->create_server(fc);
946 if (!IS_ERR(server))
947 return server;
948 }
949
950 /*
951 * Nothing we tried so far worked. At this point, give up if we've
952 * already tried AUTH_UNIX or if the server's list doesn't contain
953 * AUTH_NULL
954 */
955 if (tried_auth_unix || !auth_null_in_list)
956 return server;
957
958 /* Last chance! Try AUTH_UNIX */
959 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
960 ctx->selected_flavor = RPC_AUTH_UNIX;
961 return ctx->nfs_mod->rpc_ops->create_server(fc);
962}
963
964int nfs_try_get_tree(struct fs_context *fc)
965{
966 struct nfs_fs_context *ctx = nfs_fc2context(fc);
967
968 if (ctx->need_mount)
969 ctx->server = nfs_try_mount_request(fc);
970 else
971 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc);
972
973 return nfs_get_tree_common(fc);
974}
975EXPORT_SYMBOL_GPL(nfs_try_get_tree);
976
977
978#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
979 | NFS_MOUNT_SECURE \
980 | NFS_MOUNT_TCP \
981 | NFS_MOUNT_VER3 \
982 | NFS_MOUNT_KERBEROS \
983 | NFS_MOUNT_NONLM \
984 | NFS_MOUNT_BROKEN_SUID \
985 | NFS_MOUNT_STRICTLOCK \
986 | NFS_MOUNT_LEGACY_INTERFACE)
987
988#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
989 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
990
991static int
992nfs_compare_remount_data(struct nfs_server *nfss,
993 struct nfs_fs_context *ctx)
994{
995 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
996 ctx->rsize != nfss->rsize ||
997 ctx->wsize != nfss->wsize ||
998 ctx->version != nfss->nfs_client->rpc_ops->version ||
999 ctx->minorversion != nfss->nfs_client->cl_minorversion ||
1000 ctx->retrans != nfss->client->cl_timeout->to_retries ||
1001 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) ||
1002 ctx->acregmin != nfss->acregmin / HZ ||
1003 ctx->acregmax != nfss->acregmax / HZ ||
1004 ctx->acdirmin != nfss->acdirmin / HZ ||
1005 ctx->acdirmax != nfss->acdirmax / HZ ||
1006 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1007 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) ||
1008 ctx->nfs_server.port != nfss->port ||
1009 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1010 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address,
1011 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1012 return -EINVAL;
1013
1014 return 0;
1015}
1016
1017int nfs_reconfigure(struct fs_context *fc)
1018{
1019 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1020 struct super_block *sb = fc->root->d_sb;
1021 struct nfs_server *nfss = sb->s_fs_info;
1022 int ret;
1023
1024 sync_filesystem(sb);
1025
1026 /*
1027 * Userspace mount programs that send binary options generally send
1028 * them populated with default values. We have no way to know which
1029 * ones were explicitly specified. Fall back to legacy behavior and
1030 * just return success.
1031 */
1032 if (ctx->skip_reconfig_option_check)
1033 return 0;
1034
1035 /*
1036 * noac is a special case. It implies -o sync, but that's not
1037 * necessarily reflected in the mtab options. reconfigure_super
1038 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
1039 * remount options, so we have to explicitly reset it.
1040 */
1041 if (ctx->flags & NFS_MOUNT_NOAC) {
1042 fc->sb_flags |= SB_SYNCHRONOUS;
1043 fc->sb_flags_mask |= SB_SYNCHRONOUS;
1044 }
1045
1046 /* compare new mount options with old ones */
1047 ret = nfs_compare_remount_data(nfss, ctx);
1048 if (ret)
1049 return ret;
1050
1051 return nfs_probe_server(nfss, NFS_FH(d_inode(fc->root)));
1052}
1053EXPORT_SYMBOL_GPL(nfs_reconfigure);
1054
1055/*
1056 * Finish setting up an NFS superblock
1057 */
1058static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
1059{
1060 struct nfs_server *server = NFS_SB(sb);
1061
1062 sb->s_blocksize_bits = 0;
1063 sb->s_blocksize = 0;
1064 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
1065 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
1066 if (ctx->bsize)
1067 sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits);
1068
1069 switch (server->nfs_client->rpc_ops->version) {
1070 case 2:
1071 sb->s_time_gran = 1000;
1072 sb->s_time_min = 0;
1073 sb->s_time_max = U32_MAX;
1074 break;
1075 case 3:
1076 /*
1077 * The VFS shouldn't apply the umask to mode bits.
1078 * We will do so ourselves when necessary.
1079 */
1080 sb->s_flags |= SB_POSIXACL;
1081 sb->s_time_gran = 1;
1082 sb->s_time_min = 0;
1083 sb->s_time_max = U32_MAX;
1084 sb->s_export_op = &nfs_export_ops;
1085 break;
1086 case 4:
1087 sb->s_iflags |= SB_I_NOUMASK;
1088 sb->s_time_gran = 1;
1089 sb->s_time_min = S64_MIN;
1090 sb->s_time_max = S64_MAX;
1091 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1092 sb->s_export_op = &nfs_export_ops;
1093 break;
1094 }
1095
1096 sb->s_magic = NFS_SUPER_MAGIC;
1097
1098 /* We probably want something more informative here */
1099 snprintf(sb->s_id, sizeof(sb->s_id),
1100 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1101
1102 if (sb->s_blocksize == 0)
1103 sb->s_blocksize = nfs_block_bits(server->wsize,
1104 &sb->s_blocksize_bits);
1105
1106 nfs_super_set_maxbytes(sb, server->maxfilesize);
1107 nfs_sysfs_move_server_to_sb(sb);
1108 server->has_sec_mnt_opts = ctx->has_sec_mnt_opts;
1109}
1110
1111static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b,
1112 const struct fs_context *fc)
1113{
1114 const struct nfs_server *a = s->s_fs_info;
1115 const struct rpc_clnt *clnt_a = a->client;
1116 const struct rpc_clnt *clnt_b = b->client;
1117
1118 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK))
1119 goto Ebusy;
1120 if (a->nfs_client != b->nfs_client)
1121 goto Ebusy;
1122 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
1123 goto Ebusy;
1124 if (a->wsize != b->wsize)
1125 goto Ebusy;
1126 if (a->rsize != b->rsize)
1127 goto Ebusy;
1128 if (a->acregmin != b->acregmin)
1129 goto Ebusy;
1130 if (a->acregmax != b->acregmax)
1131 goto Ebusy;
1132 if (a->acdirmin != b->acdirmin)
1133 goto Ebusy;
1134 if (a->acdirmax != b->acdirmax)
1135 goto Ebusy;
1136 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1137 goto Ebusy;
1138 return 1;
1139Ebusy:
1140 return 0;
1141}
1142
1143static int nfs_set_super(struct super_block *s, struct fs_context *fc)
1144{
1145 struct nfs_server *server = fc->s_fs_info;
1146 int ret;
1147
1148 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
1149 ret = set_anon_super(s, server);
1150 if (ret == 0)
1151 server->s_dev = s->s_dev;
1152 return ret;
1153}
1154
1155static int nfs_compare_super_address(struct nfs_server *server1,
1156 struct nfs_server *server2)
1157{
1158 struct sockaddr *sap1, *sap2;
1159 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
1160 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
1161
1162 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
1163 return 0;
1164
1165 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1166 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1167
1168 if (sap1->sa_family != sap2->sa_family)
1169 return 0;
1170
1171 switch (sap1->sa_family) {
1172 case AF_INET: {
1173 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1174 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1175 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1176 return 0;
1177 if (sin1->sin_port != sin2->sin_port)
1178 return 0;
1179 break;
1180 }
1181 case AF_INET6: {
1182 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1183 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1184 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1185 return 0;
1186 if (sin1->sin6_port != sin2->sin6_port)
1187 return 0;
1188 break;
1189 }
1190 default:
1191 return 0;
1192 }
1193
1194 return 1;
1195}
1196
1197static int nfs_compare_userns(const struct nfs_server *old,
1198 const struct nfs_server *new)
1199{
1200 const struct user_namespace *oldns = &init_user_ns;
1201 const struct user_namespace *newns = &init_user_ns;
1202
1203 if (old->client && old->client->cl_cred)
1204 oldns = old->client->cl_cred->user_ns;
1205 if (new->client && new->client->cl_cred)
1206 newns = new->client->cl_cred->user_ns;
1207 if (oldns != newns)
1208 return 0;
1209 return 1;
1210}
1211
1212static int nfs_compare_super(struct super_block *sb, struct fs_context *fc)
1213{
1214 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb);
1215
1216 if (!nfs_compare_super_address(old, server))
1217 return 0;
1218 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1219 if (old->flags & NFS_MOUNT_UNSHARED)
1220 return 0;
1221 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1222 return 0;
1223 if (!nfs_compare_userns(old, server))
1224 return 0;
1225 if ((old->has_sec_mnt_opts || fc->security) &&
1226 security_sb_mnt_opts_compat(sb, fc->security))
1227 return 0;
1228 return nfs_compare_mount_options(sb, server, fc);
1229}
1230
1231#ifdef CONFIG_NFS_FSCACHE
1232static int nfs_get_cache_cookie(struct super_block *sb,
1233 struct nfs_fs_context *ctx)
1234{
1235 struct nfs_server *nfss = NFS_SB(sb);
1236 char *uniq = NULL;
1237 int ulen = 0;
1238
1239 nfss->fscache = NULL;
1240
1241 if (!ctx)
1242 return 0;
1243
1244 if (ctx->clone_data.sb) {
1245 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb);
1246 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
1247 return 0;
1248 if (mnt_s->fscache_uniq) {
1249 uniq = mnt_s->fscache_uniq;
1250 ulen = strlen(uniq);
1251 }
1252 } else {
1253 if (!(ctx->options & NFS_OPTION_FSCACHE))
1254 return 0;
1255 if (ctx->fscache_uniq) {
1256 uniq = ctx->fscache_uniq;
1257 ulen = strlen(ctx->fscache_uniq);
1258 }
1259 }
1260
1261 return nfs_fscache_get_super_cookie(sb, uniq, ulen);
1262}
1263#else
1264static int nfs_get_cache_cookie(struct super_block *sb,
1265 struct nfs_fs_context *ctx)
1266{
1267 return 0;
1268}
1269#endif
1270
1271int nfs_get_tree_common(struct fs_context *fc)
1272{
1273 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1274 struct super_block *s;
1275 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super;
1276 struct nfs_server *server = ctx->server;
1277 int error;
1278
1279 ctx->server = NULL;
1280 if (IS_ERR(server))
1281 return PTR_ERR(server);
1282
1283 if (server->flags & NFS_MOUNT_UNSHARED)
1284 compare_super = NULL;
1285
1286 /* -o noac implies -o sync */
1287 if (server->flags & NFS_MOUNT_NOAC)
1288 fc->sb_flags |= SB_SYNCHRONOUS;
1289
1290 if (ctx->clone_data.sb)
1291 if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS)
1292 fc->sb_flags |= SB_SYNCHRONOUS;
1293
1294 /* Get a superblock - note that we may end up sharing one that already exists */
1295 fc->s_fs_info = server;
1296 s = sget_fc(fc, compare_super, nfs_set_super);
1297 fc->s_fs_info = NULL;
1298 if (IS_ERR(s)) {
1299 error = PTR_ERR(s);
1300 nfs_errorf(fc, "NFS: Couldn't get superblock");
1301 goto out_err_nosb;
1302 }
1303
1304 if (s->s_fs_info != server) {
1305 nfs_free_server(server);
1306 server = NULL;
1307 } else {
1308 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
1309 MINOR(server->s_dev));
1310 if (error)
1311 goto error_splat_super;
1312 s->s_bdi->io_pages = server->rpages;
1313 server->super = s;
1314 }
1315
1316 if (!s->s_root) {
1317 unsigned bsize = ctx->clone_data.inherited_bsize;
1318 /* initial superblock/root creation */
1319 nfs_fill_super(s, ctx);
1320 if (bsize) {
1321 s->s_blocksize_bits = bsize;
1322 s->s_blocksize = 1U << bsize;
1323 }
1324 error = nfs_get_cache_cookie(s, ctx);
1325 if (error < 0)
1326 goto error_splat_super;
1327 }
1328
1329 error = nfs_get_root(s, fc);
1330 if (error < 0) {
1331 nfs_errorf(fc, "NFS: Couldn't get root dentry");
1332 goto error_splat_super;
1333 }
1334
1335 s->s_flags |= SB_ACTIVE;
1336 error = 0;
1337
1338out:
1339 return error;
1340
1341out_err_nosb:
1342 nfs_free_server(server);
1343 goto out;
1344error_splat_super:
1345 deactivate_locked_super(s);
1346 goto out;
1347}
1348
1349/*
1350 * Destroy an NFS superblock
1351 */
1352void nfs_kill_super(struct super_block *s)
1353{
1354 struct nfs_server *server = NFS_SB(s);
1355
1356 nfs_sysfs_move_sb_to_server(server);
1357 kill_anon_super(s);
1358
1359 nfs_fscache_release_super_cookie(s);
1360
1361 nfs_free_server(server);
1362}
1363EXPORT_SYMBOL_GPL(nfs_kill_super);
1364
1365#if IS_ENABLED(CONFIG_NFS_V4)
1366
1367/*
1368 * NFS v4 module parameters need to stay in the
1369 * NFS client for backwards compatibility
1370 */
1371unsigned int nfs_callback_set_tcpport;
1372unsigned short nfs_callback_nr_threads;
1373/* Default cache timeout is 10 minutes */
1374unsigned int nfs_idmap_cache_timeout = 600;
1375/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
1376bool nfs4_disable_idmapping = true;
1377unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
1378unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
1379unsigned short send_implementation_id = 1;
1380char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
1381bool recover_lost_locks = false;
1382short nfs_delay_retrans = -1;
1383
1384EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
1385EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
1386EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
1387EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
1388EXPORT_SYMBOL_GPL(max_session_slots);
1389EXPORT_SYMBOL_GPL(max_session_cb_slots);
1390EXPORT_SYMBOL_GPL(send_implementation_id);
1391EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
1392EXPORT_SYMBOL_GPL(recover_lost_locks);
1393EXPORT_SYMBOL_GPL(nfs_delay_retrans);
1394
1395#define NFS_CALLBACK_MAXPORTNR (65535U)
1396
1397static int param_set_portnr(const char *val, const struct kernel_param *kp)
1398{
1399 unsigned long num;
1400 int ret;
1401
1402 if (!val)
1403 return -EINVAL;
1404 ret = kstrtoul(val, 0, &num);
1405 if (ret || num > NFS_CALLBACK_MAXPORTNR)
1406 return -EINVAL;
1407 *((unsigned int *)kp->arg) = num;
1408 return 0;
1409}
1410static const struct kernel_param_ops param_ops_portnr = {
1411 .set = param_set_portnr,
1412 .get = param_get_uint,
1413};
1414#define param_check_portnr(name, p) __param_check(name, p, unsigned int)
1415
1416module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
1417module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
1418MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
1419 "assigned to the NFSv4 callback channels.");
1420module_param(nfs_idmap_cache_timeout, int, 0644);
1421module_param(nfs4_disable_idmapping, bool, 0644);
1422module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
1423 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
1424MODULE_PARM_DESC(nfs4_disable_idmapping,
1425 "Turn off NFSv4 idmapping when using 'sec=sys'");
1426module_param(max_session_slots, ushort, 0644);
1427MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
1428 "requests the client will negotiate");
1429module_param(max_session_cb_slots, ushort, 0644);
1430MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
1431 "callbacks the client will process for a given server");
1432module_param(send_implementation_id, ushort, 0644);
1433MODULE_PARM_DESC(send_implementation_id,
1434 "Send implementation ID with NFSv4.1 exchange_id");
1435MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
1436
1437module_param(recover_lost_locks, bool, 0644);
1438MODULE_PARM_DESC(recover_lost_locks,
1439 "If the server reports that a lock might be lost, "
1440 "try to recover it risking data corruption.");
1441
1442module_param_named(delay_retrans, nfs_delay_retrans, short, 0644);
1443MODULE_PARM_DESC(delay_retrans,
1444 "Unless negative, specifies the number of times the NFSv4 "
1445 "client retries a request before returning an EAGAIN error, "
1446 "after a reply of NFS4ERR_DELAY from the server.");
1447#endif /* CONFIG_NFS_V4 */
1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
36#include <linux/sunrpc/xprtsock.h>
37#include <linux/sunrpc/xprtrdma.h>
38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
42#include <linux/seq_file.h>
43#include <linux/mount.h>
44#include <linux/namei.h>
45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
48#include <linux/in6.h>
49#include <linux/slab.h>
50#include <net/ipv6.h>
51#include <linux/netdevice.h>
52#include <linux/nfs_xdr.h>
53#include <linux/magic.h>
54#include <linux/parser.h>
55#include <linux/nsproxy.h>
56#include <linux/rcupdate.h>
57
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
65#include "fscache.h"
66#include "pnfs.h"
67
68#define NFSDBG_FACILITY NFSDBG_VFS
69#define NFS_TEXT_DATA 1
70
71#ifdef CONFIG_NFS_V3
72#define NFS_DEFAULT_VERSION 3
73#else
74#define NFS_DEFAULT_VERSION 2
75#endif
76
77enum {
78 /* Mount options that take no arguments */
79 Opt_soft, Opt_hard,
80 Opt_posix, Opt_noposix,
81 Opt_cto, Opt_nocto,
82 Opt_ac, Opt_noac,
83 Opt_lock, Opt_nolock,
84 Opt_udp, Opt_tcp, Opt_rdma,
85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
87 Opt_sharecache, Opt_nosharecache,
88 Opt_resvport, Opt_noresvport,
89 Opt_fscache, Opt_nofscache,
90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
100 Opt_mountvers,
101 Opt_minorversion,
102
103 /* Mount options that take string arguments */
104 Opt_nfsvers,
105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
107 Opt_lookupcache,
108 Opt_fscache_uniq,
109 Opt_local_lock,
110
111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
113
114 Opt_err
115};
116
117static const match_table_t nfs_mount_option_tokens = {
118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
120 { Opt_userspace, "retry=%s" },
121
122 { Opt_sloppy, "sloppy" },
123
124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_udp, "udp" },
137 { Opt_tcp, "tcp" },
138 { Opt_rdma, "rdma" },
139 { Opt_acl, "acl" },
140 { Opt_noacl, "noacl" },
141 { Opt_rdirplus, "rdirplus" },
142 { Opt_nordirplus, "nordirplus" },
143 { Opt_sharecache, "sharecache" },
144 { Opt_nosharecache, "nosharecache" },
145 { Opt_resvport, "resvport" },
146 { Opt_noresvport, "noresvport" },
147 { Opt_fscache, "fsc" },
148 { Opt_nofscache, "nofsc" },
149
150 { Opt_port, "port=%s" },
151 { Opt_rsize, "rsize=%s" },
152 { Opt_wsize, "wsize=%s" },
153 { Opt_bsize, "bsize=%s" },
154 { Opt_timeo, "timeo=%s" },
155 { Opt_retrans, "retrans=%s" },
156 { Opt_acregmin, "acregmin=%s" },
157 { Opt_acregmax, "acregmax=%s" },
158 { Opt_acdirmin, "acdirmin=%s" },
159 { Opt_acdirmax, "acdirmax=%s" },
160 { Opt_actimeo, "actimeo=%s" },
161 { Opt_namelen, "namlen=%s" },
162 { Opt_mountport, "mountport=%s" },
163 { Opt_mountvers, "mountvers=%s" },
164 { Opt_minorversion, "minorversion=%s" },
165
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
168
169 { Opt_sec, "sec=%s" },
170 { Opt_proto, "proto=%s" },
171 { Opt_mountproto, "mountproto=%s" },
172 { Opt_addr, "addr=%s" },
173 { Opt_clientaddr, "clientaddr=%s" },
174 { Opt_mounthost, "mounthost=%s" },
175 { Opt_mountaddr, "mountaddr=%s" },
176
177 { Opt_lookupcache, "lookupcache=%s" },
178 { Opt_fscache_uniq, "fsc=%s" },
179 { Opt_local_lock, "local_lock=%s" },
180
181 /* The following needs to be listed after all other options */
182 { Opt_nfsvers, "v%s" },
183
184 { Opt_err, NULL }
185};
186
187enum {
188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
189
190 Opt_xprt_err
191};
192
193static const match_table_t nfs_xprt_protocol_tokens = {
194 { Opt_xprt_udp, "udp" },
195 { Opt_xprt_udp6, "udp6" },
196 { Opt_xprt_tcp, "tcp" },
197 { Opt_xprt_tcp6, "tcp6" },
198 { Opt_xprt_rdma, "rdma" },
199
200 { Opt_xprt_err, NULL }
201};
202
203enum {
204 Opt_sec_none, Opt_sec_sys,
205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
208
209 Opt_sec_err
210};
211
212static const match_table_t nfs_secflavor_tokens = {
213 { Opt_sec_none, "none" },
214 { Opt_sec_none, "null" },
215 { Opt_sec_sys, "sys" },
216
217 { Opt_sec_krb5, "krb5" },
218 { Opt_sec_krb5i, "krb5i" },
219 { Opt_sec_krb5p, "krb5p" },
220
221 { Opt_sec_lkey, "lkey" },
222 { Opt_sec_lkeyi, "lkeyi" },
223 { Opt_sec_lkeyp, "lkeyp" },
224
225 { Opt_sec_spkm, "spkm3" },
226 { Opt_sec_spkmi, "spkm3i" },
227 { Opt_sec_spkmp, "spkm3p" },
228
229 { Opt_sec_err, NULL }
230};
231
232enum {
233 Opt_lookupcache_all, Opt_lookupcache_positive,
234 Opt_lookupcache_none,
235
236 Opt_lookupcache_err
237};
238
239static match_table_t nfs_lookupcache_tokens = {
240 { Opt_lookupcache_all, "all" },
241 { Opt_lookupcache_positive, "pos" },
242 { Opt_lookupcache_positive, "positive" },
243 { Opt_lookupcache_none, "none" },
244
245 { Opt_lookupcache_err, NULL }
246};
247
248enum {
249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
250 Opt_local_lock_none,
251
252 Opt_local_lock_err
253};
254
255static match_table_t nfs_local_lock_tokens = {
256 { Opt_local_lock_all, "all" },
257 { Opt_local_lock_flock, "flock" },
258 { Opt_local_lock_posix, "posix" },
259 { Opt_local_lock_none, "none" },
260
261 { Opt_local_lock_err, NULL }
262};
263
264enum {
265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
266 Opt_vers_4_1,
267
268 Opt_vers_err
269};
270
271static match_table_t nfs_vers_tokens = {
272 { Opt_vers_2, "2" },
273 { Opt_vers_3, "3" },
274 { Opt_vers_4, "4" },
275 { Opt_vers_4_0, "4.0" },
276 { Opt_vers_4_1, "4.1" },
277
278 { Opt_vers_err, NULL }
279};
280
281struct nfs_mount_info {
282 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
283 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
284 struct nfs_parsed_mount_data *parsed;
285 struct nfs_clone_mount *cloned;
286 struct nfs_fh *mntfh;
287};
288
289static void nfs_umount_begin(struct super_block *);
290static int nfs_statfs(struct dentry *, struct kstatfs *);
291static int nfs_show_options(struct seq_file *, struct dentry *);
292static int nfs_show_devname(struct seq_file *, struct dentry *);
293static int nfs_show_path(struct seq_file *, struct dentry *);
294static int nfs_show_stats(struct seq_file *, struct dentry *);
295static struct dentry *nfs_fs_mount_common(struct file_system_type *,
296 struct nfs_server *, int, const char *, struct nfs_mount_info *);
297static struct dentry *nfs_fs_mount(struct file_system_type *,
298 int, const char *, void *);
299static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
300 int flags, const char *dev_name, void *raw_data);
301static void nfs_put_super(struct super_block *);
302static void nfs_kill_super(struct super_block *);
303static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
304
305static struct file_system_type nfs_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs",
308 .mount = nfs_fs_mount,
309 .kill_sb = nfs_kill_super,
310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
311};
312
313struct file_system_type nfs_xdev_fs_type = {
314 .owner = THIS_MODULE,
315 .name = "nfs",
316 .mount = nfs_xdev_mount,
317 .kill_sb = nfs_kill_super,
318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
319};
320
321static const struct super_operations nfs_sops = {
322 .alloc_inode = nfs_alloc_inode,
323 .destroy_inode = nfs_destroy_inode,
324 .write_inode = nfs_write_inode,
325 .put_super = nfs_put_super,
326 .statfs = nfs_statfs,
327 .evict_inode = nfs_evict_inode,
328 .umount_begin = nfs_umount_begin,
329 .show_options = nfs_show_options,
330 .show_devname = nfs_show_devname,
331 .show_path = nfs_show_path,
332 .show_stats = nfs_show_stats,
333 .remount_fs = nfs_remount,
334};
335
336#ifdef CONFIG_NFS_V4
337static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
338static int nfs4_validate_mount_data(void *options,
339 struct nfs_parsed_mount_data *args, const char *dev_name);
340static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
341 struct nfs_mount_info *mount_info);
342static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
343 int flags, const char *dev_name, void *raw_data);
344static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
345 int flags, const char *dev_name, void *raw_data);
346static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
347 int flags, const char *dev_name, void *raw_data);
348static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
349 int flags, const char *dev_name, void *raw_data);
350static void nfs4_kill_super(struct super_block *sb);
351
352static struct file_system_type nfs4_fs_type = {
353 .owner = THIS_MODULE,
354 .name = "nfs4",
355 .mount = nfs_fs_mount,
356 .kill_sb = nfs4_kill_super,
357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
358};
359
360static struct file_system_type nfs4_remote_fs_type = {
361 .owner = THIS_MODULE,
362 .name = "nfs4",
363 .mount = nfs4_remote_mount,
364 .kill_sb = nfs4_kill_super,
365 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
366};
367
368struct file_system_type nfs4_xdev_fs_type = {
369 .owner = THIS_MODULE,
370 .name = "nfs4",
371 .mount = nfs4_xdev_mount,
372 .kill_sb = nfs4_kill_super,
373 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
374};
375
376static struct file_system_type nfs4_remote_referral_fs_type = {
377 .owner = THIS_MODULE,
378 .name = "nfs4",
379 .mount = nfs4_remote_referral_mount,
380 .kill_sb = nfs4_kill_super,
381 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
382};
383
384struct file_system_type nfs4_referral_fs_type = {
385 .owner = THIS_MODULE,
386 .name = "nfs4",
387 .mount = nfs4_referral_mount,
388 .kill_sb = nfs4_kill_super,
389 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
390};
391
392static const struct super_operations nfs4_sops = {
393 .alloc_inode = nfs_alloc_inode,
394 .destroy_inode = nfs_destroy_inode,
395 .write_inode = nfs_write_inode,
396 .put_super = nfs_put_super,
397 .statfs = nfs_statfs,
398 .evict_inode = nfs4_evict_inode,
399 .umount_begin = nfs_umount_begin,
400 .show_options = nfs_show_options,
401 .show_devname = nfs_show_devname,
402 .show_path = nfs_show_path,
403 .show_stats = nfs_show_stats,
404 .remount_fs = nfs_remount,
405};
406#endif
407
408static struct shrinker acl_shrinker = {
409 .shrink = nfs_access_cache_shrinker,
410 .seeks = DEFAULT_SEEKS,
411};
412
413/*
414 * Register the NFS filesystems
415 */
416int __init register_nfs_fs(void)
417{
418 int ret;
419
420 ret = register_filesystem(&nfs_fs_type);
421 if (ret < 0)
422 goto error_0;
423
424 ret = nfs_register_sysctl();
425 if (ret < 0)
426 goto error_1;
427#ifdef CONFIG_NFS_V4
428 ret = register_filesystem(&nfs4_fs_type);
429 if (ret < 0)
430 goto error_2;
431#endif
432 register_shrinker(&acl_shrinker);
433 return 0;
434
435#ifdef CONFIG_NFS_V4
436error_2:
437 nfs_unregister_sysctl();
438#endif
439error_1:
440 unregister_filesystem(&nfs_fs_type);
441error_0:
442 return ret;
443}
444
445/*
446 * Unregister the NFS filesystems
447 */
448void __exit unregister_nfs_fs(void)
449{
450 unregister_shrinker(&acl_shrinker);
451#ifdef CONFIG_NFS_V4
452 unregister_filesystem(&nfs4_fs_type);
453#endif
454 nfs_unregister_sysctl();
455 unregister_filesystem(&nfs_fs_type);
456}
457
458void nfs_sb_active(struct super_block *sb)
459{
460 struct nfs_server *server = NFS_SB(sb);
461
462 if (atomic_inc_return(&server->active) == 1)
463 atomic_inc(&sb->s_active);
464}
465
466void nfs_sb_deactive(struct super_block *sb)
467{
468 struct nfs_server *server = NFS_SB(sb);
469
470 if (atomic_dec_and_test(&server->active))
471 deactivate_super(sb);
472}
473
474/*
475 * Deliver file system statistics to userspace
476 */
477static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
478{
479 struct nfs_server *server = NFS_SB(dentry->d_sb);
480 unsigned char blockbits;
481 unsigned long blockres;
482 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
483 struct nfs_fsstat res;
484 int error = -ENOMEM;
485
486 res.fattr = nfs_alloc_fattr();
487 if (res.fattr == NULL)
488 goto out_err;
489
490 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
491 if (unlikely(error == -ESTALE)) {
492 struct dentry *pd_dentry;
493
494 pd_dentry = dget_parent(dentry);
495 if (pd_dentry != NULL) {
496 nfs_zap_caches(pd_dentry->d_inode);
497 dput(pd_dentry);
498 }
499 }
500 nfs_free_fattr(res.fattr);
501 if (error < 0)
502 goto out_err;
503
504 buf->f_type = NFS_SUPER_MAGIC;
505
506 /*
507 * Current versions of glibc do not correctly handle the
508 * case where f_frsize != f_bsize. Eventually we want to
509 * report the value of wtmult in this field.
510 */
511 buf->f_frsize = dentry->d_sb->s_blocksize;
512
513 /*
514 * On most *nix systems, f_blocks, f_bfree, and f_bavail
515 * are reported in units of f_frsize. Linux hasn't had
516 * an f_frsize field in its statfs struct until recently,
517 * thus historically Linux's sys_statfs reports these
518 * fields in units of f_bsize.
519 */
520 buf->f_bsize = dentry->d_sb->s_blocksize;
521 blockbits = dentry->d_sb->s_blocksize_bits;
522 blockres = (1 << blockbits) - 1;
523 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
524 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
525 buf->f_bavail = (res.abytes + blockres) >> blockbits;
526
527 buf->f_files = res.tfiles;
528 buf->f_ffree = res.afiles;
529
530 buf->f_namelen = server->namelen;
531
532 return 0;
533
534 out_err:
535 dprintk("%s: statfs error = %d\n", __func__, -error);
536 return error;
537}
538
539/*
540 * Map the security flavour number to a name
541 */
542static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
543{
544 static const struct {
545 rpc_authflavor_t flavour;
546 const char *str;
547 } sec_flavours[] = {
548 { RPC_AUTH_NULL, "null" },
549 { RPC_AUTH_UNIX, "sys" },
550 { RPC_AUTH_GSS_KRB5, "krb5" },
551 { RPC_AUTH_GSS_KRB5I, "krb5i" },
552 { RPC_AUTH_GSS_KRB5P, "krb5p" },
553 { RPC_AUTH_GSS_LKEY, "lkey" },
554 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
555 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
556 { RPC_AUTH_GSS_SPKM, "spkm" },
557 { RPC_AUTH_GSS_SPKMI, "spkmi" },
558 { RPC_AUTH_GSS_SPKMP, "spkmp" },
559 { UINT_MAX, "unknown" }
560 };
561 int i;
562
563 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
564 if (sec_flavours[i].flavour == flavour)
565 break;
566 }
567 return sec_flavours[i].str;
568}
569
570static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
571 int showdefaults)
572{
573 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
574
575 seq_printf(m, ",mountproto=");
576 switch (sap->sa_family) {
577 case AF_INET:
578 switch (nfss->mountd_protocol) {
579 case IPPROTO_UDP:
580 seq_printf(m, RPCBIND_NETID_UDP);
581 break;
582 case IPPROTO_TCP:
583 seq_printf(m, RPCBIND_NETID_TCP);
584 break;
585 default:
586 if (showdefaults)
587 seq_printf(m, "auto");
588 }
589 break;
590 case AF_INET6:
591 switch (nfss->mountd_protocol) {
592 case IPPROTO_UDP:
593 seq_printf(m, RPCBIND_NETID_UDP6);
594 break;
595 case IPPROTO_TCP:
596 seq_printf(m, RPCBIND_NETID_TCP6);
597 break;
598 default:
599 if (showdefaults)
600 seq_printf(m, "auto");
601 }
602 break;
603 default:
604 if (showdefaults)
605 seq_printf(m, "auto");
606 }
607}
608
609static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
610 int showdefaults)
611{
612 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
613
614 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
615 return;
616
617 switch (sap->sa_family) {
618 case AF_INET: {
619 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
620 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
621 break;
622 }
623 case AF_INET6: {
624 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
625 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
626 break;
627 }
628 default:
629 if (showdefaults)
630 seq_printf(m, ",mountaddr=unspecified");
631 }
632
633 if (nfss->mountd_version || showdefaults)
634 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
635 if ((nfss->mountd_port &&
636 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
637 showdefaults)
638 seq_printf(m, ",mountport=%u", nfss->mountd_port);
639
640 nfs_show_mountd_netid(m, nfss, showdefaults);
641}
642
643#ifdef CONFIG_NFS_V4
644static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
645 int showdefaults)
646{
647 struct nfs_client *clp = nfss->nfs_client;
648
649 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
650}
651#else
652static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
653 int showdefaults)
654{
655}
656#endif
657
658static void nfs_show_nfs_version(struct seq_file *m,
659 unsigned int version,
660 unsigned int minorversion)
661{
662 seq_printf(m, ",vers=%u", version);
663 if (version == 4)
664 seq_printf(m, ".%u", minorversion);
665}
666
667/*
668 * Describe the mount options in force on this server representation
669 */
670static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
671 int showdefaults)
672{
673 static const struct proc_nfs_info {
674 int flag;
675 const char *str;
676 const char *nostr;
677 } nfs_info[] = {
678 { NFS_MOUNT_SOFT, ",soft", ",hard" },
679 { NFS_MOUNT_POSIX, ",posix", "" },
680 { NFS_MOUNT_NOCTO, ",nocto", "" },
681 { NFS_MOUNT_NOAC, ",noac", "" },
682 { NFS_MOUNT_NONLM, ",nolock", "" },
683 { NFS_MOUNT_NOACL, ",noacl", "" },
684 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
685 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
686 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
687 { 0, NULL, NULL }
688 };
689 const struct proc_nfs_info *nfs_infop;
690 struct nfs_client *clp = nfss->nfs_client;
691 u32 version = clp->rpc_ops->version;
692 int local_flock, local_fcntl;
693
694 nfs_show_nfs_version(m, version, clp->cl_minorversion);
695 seq_printf(m, ",rsize=%u", nfss->rsize);
696 seq_printf(m, ",wsize=%u", nfss->wsize);
697 if (nfss->bsize != 0)
698 seq_printf(m, ",bsize=%u", nfss->bsize);
699 seq_printf(m, ",namlen=%u", nfss->namelen);
700 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
701 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
702 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
703 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
704 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
705 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
706 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
707 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
708 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
709 if (nfss->flags & nfs_infop->flag)
710 seq_puts(m, nfs_infop->str);
711 else
712 seq_puts(m, nfs_infop->nostr);
713 }
714 rcu_read_lock();
715 seq_printf(m, ",proto=%s",
716 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
717 rcu_read_unlock();
718 if (version == 4) {
719 if (nfss->port != NFS_PORT)
720 seq_printf(m, ",port=%u", nfss->port);
721 } else
722 if (nfss->port)
723 seq_printf(m, ",port=%u", nfss->port);
724
725 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
726 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
727 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
728
729 if (version != 4)
730 nfs_show_mountd_options(m, nfss, showdefaults);
731 else
732 nfs_show_nfsv4_options(m, nfss, showdefaults);
733
734 if (nfss->options & NFS_OPTION_FSCACHE)
735 seq_printf(m, ",fsc");
736
737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
738 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
739 seq_printf(m, ",lookupcache=none");
740 else
741 seq_printf(m, ",lookupcache=pos");
742 }
743
744 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
745 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
746
747 if (!local_flock && !local_fcntl)
748 seq_printf(m, ",local_lock=none");
749 else if (local_flock && local_fcntl)
750 seq_printf(m, ",local_lock=all");
751 else if (local_flock)
752 seq_printf(m, ",local_lock=flock");
753 else
754 seq_printf(m, ",local_lock=posix");
755}
756
757/*
758 * Describe the mount options on this VFS mountpoint
759 */
760static int nfs_show_options(struct seq_file *m, struct dentry *root)
761{
762 struct nfs_server *nfss = NFS_SB(root->d_sb);
763
764 nfs_show_mount_options(m, nfss, 0);
765
766 rcu_read_lock();
767 seq_printf(m, ",addr=%s",
768 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
769 RPC_DISPLAY_ADDR));
770 rcu_read_unlock();
771
772 return 0;
773}
774
775#ifdef CONFIG_NFS_V4
776#ifdef CONFIG_NFS_V4_1
777static void show_sessions(struct seq_file *m, struct nfs_server *server)
778{
779 if (nfs4_has_session(server->nfs_client))
780 seq_printf(m, ",sessions");
781}
782#else
783static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
784#endif
785#endif
786
787#ifdef CONFIG_NFS_V4_1
788static void show_pnfs(struct seq_file *m, struct nfs_server *server)
789{
790 seq_printf(m, ",pnfs=");
791 if (server->pnfs_curr_ld)
792 seq_printf(m, "%s", server->pnfs_curr_ld->name);
793 else
794 seq_printf(m, "not configured");
795}
796
797static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
798{
799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
802 "date='%llu,%u'",
803 impl_id->name, impl_id->domain,
804 impl_id->date.seconds, impl_id->date.nseconds);
805 }
806}
807#else
808#ifdef CONFIG_NFS_V4
809static void show_pnfs(struct seq_file *m, struct nfs_server *server)
810{
811}
812#endif
813static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
814{
815}
816#endif
817
818static int nfs_show_devname(struct seq_file *m, struct dentry *root)
819{
820 char *page = (char *) __get_free_page(GFP_KERNEL);
821 char *devname, *dummy;
822 int err = 0;
823 if (!page)
824 return -ENOMEM;
825 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
826 if (IS_ERR(devname))
827 err = PTR_ERR(devname);
828 else
829 seq_escape(m, devname, " \t\n\\");
830 free_page((unsigned long)page);
831 return err;
832}
833
834static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
835{
836 seq_puts(m, "/");
837 return 0;
838}
839
840/*
841 * Present statistical information for this VFS mountpoint
842 */
843static int nfs_show_stats(struct seq_file *m, struct dentry *root)
844{
845 int i, cpu;
846 struct nfs_server *nfss = NFS_SB(root->d_sb);
847 struct rpc_auth *auth = nfss->client->cl_auth;
848 struct nfs_iostats totals = { };
849
850 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
851
852 /*
853 * Display all mount option settings
854 */
855 seq_printf(m, "\n\topts:\t");
856 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
857 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
858 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
859 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
860 nfs_show_mount_options(m, nfss, 1);
861
862 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
863
864 show_implementation_id(m, nfss);
865
866 seq_printf(m, "\n\tcaps:\t");
867 seq_printf(m, "caps=0x%x", nfss->caps);
868 seq_printf(m, ",wtmult=%u", nfss->wtmult);
869 seq_printf(m, ",dtsize=%u", nfss->dtsize);
870 seq_printf(m, ",bsize=%u", nfss->bsize);
871 seq_printf(m, ",namlen=%u", nfss->namelen);
872
873#ifdef CONFIG_NFS_V4
874 if (nfss->nfs_client->rpc_ops->version == 4) {
875 seq_printf(m, "\n\tnfsv4:\t");
876 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
877 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
878 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
879 show_sessions(m, nfss);
880 show_pnfs(m, nfss);
881 }
882#endif
883
884 /*
885 * Display security flavor in effect for this mount
886 */
887 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
888 if (auth->au_flavor)
889 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
890
891 /*
892 * Display superblock I/O counters
893 */
894 for_each_possible_cpu(cpu) {
895 struct nfs_iostats *stats;
896
897 preempt_disable();
898 stats = per_cpu_ptr(nfss->io_stats, cpu);
899
900 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
901 totals.events[i] += stats->events[i];
902 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
903 totals.bytes[i] += stats->bytes[i];
904#ifdef CONFIG_NFS_FSCACHE
905 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
906 totals.fscache[i] += stats->fscache[i];
907#endif
908
909 preempt_enable();
910 }
911
912 seq_printf(m, "\n\tevents:\t");
913 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
914 seq_printf(m, "%lu ", totals.events[i]);
915 seq_printf(m, "\n\tbytes:\t");
916 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
917 seq_printf(m, "%Lu ", totals.bytes[i]);
918#ifdef CONFIG_NFS_FSCACHE
919 if (nfss->options & NFS_OPTION_FSCACHE) {
920 seq_printf(m, "\n\tfsc:\t");
921 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
922 seq_printf(m, "%Lu ", totals.bytes[i]);
923 }
924#endif
925 seq_printf(m, "\n");
926
927 rpc_print_iostats(m, nfss->client);
928
929 return 0;
930}
931
932/*
933 * Begin unmount by attempting to remove all automounted mountpoints we added
934 * in response to xdev traversals and referrals
935 */
936static void nfs_umount_begin(struct super_block *sb)
937{
938 struct nfs_server *server;
939 struct rpc_clnt *rpc;
940
941 server = NFS_SB(sb);
942 /* -EIO all pending I/O */
943 rpc = server->client_acl;
944 if (!IS_ERR(rpc))
945 rpc_killall_tasks(rpc);
946 rpc = server->client;
947 if (!IS_ERR(rpc))
948 rpc_killall_tasks(rpc);
949}
950
951static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
952{
953 struct nfs_parsed_mount_data *data;
954
955 data = kzalloc(sizeof(*data), GFP_KERNEL);
956 if (data) {
957 data->acregmin = NFS_DEF_ACREGMIN;
958 data->acregmax = NFS_DEF_ACREGMAX;
959 data->acdirmin = NFS_DEF_ACDIRMIN;
960 data->acdirmax = NFS_DEF_ACDIRMAX;
961 data->mount_server.port = NFS_UNSPEC_PORT;
962 data->nfs_server.port = NFS_UNSPEC_PORT;
963 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
964 data->auth_flavors[0] = RPC_AUTH_UNIX;
965 data->auth_flavor_len = 1;
966 data->minorversion = 0;
967 data->need_mount = true;
968 data->net = current->nsproxy->net_ns;
969 security_init_mnt_opts(&data->lsm_opts);
970 }
971 return data;
972}
973
974static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
975{
976 if (data) {
977 kfree(data->client_address);
978 kfree(data->mount_server.hostname);
979 kfree(data->nfs_server.export_path);
980 kfree(data->nfs_server.hostname);
981 kfree(data->fscache_uniq);
982 security_free_mnt_opts(&data->lsm_opts);
983 kfree(data);
984 }
985}
986
987/*
988 * Sanity-check a server address provided by the mount command.
989 *
990 * Address family must be initialized, and address must not be
991 * the ANY address for that family.
992 */
993static int nfs_verify_server_address(struct sockaddr *addr)
994{
995 switch (addr->sa_family) {
996 case AF_INET: {
997 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
998 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
999 }
1000 case AF_INET6: {
1001 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1002 return !ipv6_addr_any(sa);
1003 }
1004 }
1005
1006 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
1007 return 0;
1008}
1009
1010/*
1011 * Select between a default port value and a user-specified port value.
1012 * If a zero value is set, then autobind will be used.
1013 */
1014static void nfs_set_port(struct sockaddr *sap, int *port,
1015 const unsigned short default_port)
1016{
1017 if (*port == NFS_UNSPEC_PORT)
1018 *port = default_port;
1019
1020 rpc_set_port(sap, *port);
1021}
1022
1023/*
1024 * Sanity check the NFS transport protocol.
1025 *
1026 */
1027static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1028{
1029 switch (mnt->nfs_server.protocol) {
1030 case XPRT_TRANSPORT_UDP:
1031 case XPRT_TRANSPORT_TCP:
1032 case XPRT_TRANSPORT_RDMA:
1033 break;
1034 default:
1035 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1036 }
1037}
1038
1039/*
1040 * For text based NFSv2/v3 mounts, the mount protocol transport default
1041 * settings should depend upon the specified NFS transport.
1042 */
1043static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1044{
1045 nfs_validate_transport_protocol(mnt);
1046
1047 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1048 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1049 return;
1050 switch (mnt->nfs_server.protocol) {
1051 case XPRT_TRANSPORT_UDP:
1052 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1053 break;
1054 case XPRT_TRANSPORT_TCP:
1055 case XPRT_TRANSPORT_RDMA:
1056 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1057 }
1058}
1059
1060/*
1061 * Parse the value of the 'sec=' option.
1062 */
1063static int nfs_parse_security_flavors(char *value,
1064 struct nfs_parsed_mount_data *mnt)
1065{
1066 substring_t args[MAX_OPT_ARGS];
1067
1068 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1069
1070 switch (match_token(value, nfs_secflavor_tokens, args)) {
1071 case Opt_sec_none:
1072 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1073 break;
1074 case Opt_sec_sys:
1075 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1076 break;
1077 case Opt_sec_krb5:
1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1079 break;
1080 case Opt_sec_krb5i:
1081 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1082 break;
1083 case Opt_sec_krb5p:
1084 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1085 break;
1086 case Opt_sec_lkey:
1087 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1088 break;
1089 case Opt_sec_lkeyi:
1090 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1091 break;
1092 case Opt_sec_lkeyp:
1093 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1094 break;
1095 case Opt_sec_spkm:
1096 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1097 break;
1098 case Opt_sec_spkmi:
1099 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1100 break;
1101 case Opt_sec_spkmp:
1102 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1103 break;
1104 default:
1105 return 0;
1106 }
1107
1108 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1109 mnt->auth_flavor_len = 1;
1110 return 1;
1111}
1112
1113static int nfs_parse_version_string(char *string,
1114 struct nfs_parsed_mount_data *mnt,
1115 substring_t *args)
1116{
1117 mnt->flags &= ~NFS_MOUNT_VER3;
1118 switch (match_token(string, nfs_vers_tokens, args)) {
1119 case Opt_vers_2:
1120 mnt->version = 2;
1121 break;
1122 case Opt_vers_3:
1123 mnt->flags |= NFS_MOUNT_VER3;
1124 mnt->version = 3;
1125 break;
1126 case Opt_vers_4:
1127 /* Backward compatibility option. In future,
1128 * the mount program should always supply
1129 * a NFSv4 minor version number.
1130 */
1131 mnt->version = 4;
1132 break;
1133 case Opt_vers_4_0:
1134 mnt->version = 4;
1135 mnt->minorversion = 0;
1136 break;
1137 case Opt_vers_4_1:
1138 mnt->version = 4;
1139 mnt->minorversion = 1;
1140 break;
1141 default:
1142 return 0;
1143 }
1144 return 1;
1145}
1146
1147static int nfs_get_option_str(substring_t args[], char **option)
1148{
1149 kfree(*option);
1150 *option = match_strdup(args);
1151 return !option;
1152}
1153
1154static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1155{
1156 int rc;
1157 char *string;
1158
1159 string = match_strdup(args);
1160 if (string == NULL)
1161 return -ENOMEM;
1162 rc = strict_strtoul(string, 10, option);
1163 kfree(string);
1164
1165 return rc;
1166}
1167
1168/*
1169 * Error-check and convert a string of mount options from user space into
1170 * a data structure. The whole mount string is processed; bad options are
1171 * skipped as they are encountered. If there were no errors, return 1;
1172 * otherwise return 0 (zero).
1173 */
1174static int nfs_parse_mount_options(char *raw,
1175 struct nfs_parsed_mount_data *mnt)
1176{
1177 char *p, *string, *secdata;
1178 int rc, sloppy = 0, invalid_option = 0;
1179 unsigned short protofamily = AF_UNSPEC;
1180 unsigned short mountfamily = AF_UNSPEC;
1181
1182 if (!raw) {
1183 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1184 return 1;
1185 }
1186 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1187
1188 secdata = alloc_secdata();
1189 if (!secdata)
1190 goto out_nomem;
1191
1192 rc = security_sb_copy_data(raw, secdata);
1193 if (rc)
1194 goto out_security_failure;
1195
1196 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1197 if (rc)
1198 goto out_security_failure;
1199
1200 free_secdata(secdata);
1201
1202 while ((p = strsep(&raw, ",")) != NULL) {
1203 substring_t args[MAX_OPT_ARGS];
1204 unsigned long option;
1205 int token;
1206
1207 if (!*p)
1208 continue;
1209
1210 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1211
1212 token = match_token(p, nfs_mount_option_tokens, args);
1213 switch (token) {
1214
1215 /*
1216 * boolean options: foo/nofoo
1217 */
1218 case Opt_soft:
1219 mnt->flags |= NFS_MOUNT_SOFT;
1220 break;
1221 case Opt_hard:
1222 mnt->flags &= ~NFS_MOUNT_SOFT;
1223 break;
1224 case Opt_posix:
1225 mnt->flags |= NFS_MOUNT_POSIX;
1226 break;
1227 case Opt_noposix:
1228 mnt->flags &= ~NFS_MOUNT_POSIX;
1229 break;
1230 case Opt_cto:
1231 mnt->flags &= ~NFS_MOUNT_NOCTO;
1232 break;
1233 case Opt_nocto:
1234 mnt->flags |= NFS_MOUNT_NOCTO;
1235 break;
1236 case Opt_ac:
1237 mnt->flags &= ~NFS_MOUNT_NOAC;
1238 break;
1239 case Opt_noac:
1240 mnt->flags |= NFS_MOUNT_NOAC;
1241 break;
1242 case Opt_lock:
1243 mnt->flags &= ~NFS_MOUNT_NONLM;
1244 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1245 NFS_MOUNT_LOCAL_FCNTL);
1246 break;
1247 case Opt_nolock:
1248 mnt->flags |= NFS_MOUNT_NONLM;
1249 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1250 NFS_MOUNT_LOCAL_FCNTL);
1251 break;
1252 case Opt_udp:
1253 mnt->flags &= ~NFS_MOUNT_TCP;
1254 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1255 break;
1256 case Opt_tcp:
1257 mnt->flags |= NFS_MOUNT_TCP;
1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1259 break;
1260 case Opt_rdma:
1261 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1262 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1263 xprt_load_transport(p);
1264 break;
1265 case Opt_acl:
1266 mnt->flags &= ~NFS_MOUNT_NOACL;
1267 break;
1268 case Opt_noacl:
1269 mnt->flags |= NFS_MOUNT_NOACL;
1270 break;
1271 case Opt_rdirplus:
1272 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1273 break;
1274 case Opt_nordirplus:
1275 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1276 break;
1277 case Opt_sharecache:
1278 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1279 break;
1280 case Opt_nosharecache:
1281 mnt->flags |= NFS_MOUNT_UNSHARED;
1282 break;
1283 case Opt_resvport:
1284 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1285 break;
1286 case Opt_noresvport:
1287 mnt->flags |= NFS_MOUNT_NORESVPORT;
1288 break;
1289 case Opt_fscache:
1290 mnt->options |= NFS_OPTION_FSCACHE;
1291 kfree(mnt->fscache_uniq);
1292 mnt->fscache_uniq = NULL;
1293 break;
1294 case Opt_nofscache:
1295 mnt->options &= ~NFS_OPTION_FSCACHE;
1296 kfree(mnt->fscache_uniq);
1297 mnt->fscache_uniq = NULL;
1298 break;
1299
1300 /*
1301 * options that take numeric values
1302 */
1303 case Opt_port:
1304 if (nfs_get_option_ul(args, &option) ||
1305 option > USHRT_MAX)
1306 goto out_invalid_value;
1307 mnt->nfs_server.port = option;
1308 break;
1309 case Opt_rsize:
1310 if (nfs_get_option_ul(args, &option))
1311 goto out_invalid_value;
1312 mnt->rsize = option;
1313 break;
1314 case Opt_wsize:
1315 if (nfs_get_option_ul(args, &option))
1316 goto out_invalid_value;
1317 mnt->wsize = option;
1318 break;
1319 case Opt_bsize:
1320 if (nfs_get_option_ul(args, &option))
1321 goto out_invalid_value;
1322 mnt->bsize = option;
1323 break;
1324 case Opt_timeo:
1325 if (nfs_get_option_ul(args, &option) || option == 0)
1326 goto out_invalid_value;
1327 mnt->timeo = option;
1328 break;
1329 case Opt_retrans:
1330 if (nfs_get_option_ul(args, &option) || option == 0)
1331 goto out_invalid_value;
1332 mnt->retrans = option;
1333 break;
1334 case Opt_acregmin:
1335 if (nfs_get_option_ul(args, &option))
1336 goto out_invalid_value;
1337 mnt->acregmin = option;
1338 break;
1339 case Opt_acregmax:
1340 if (nfs_get_option_ul(args, &option))
1341 goto out_invalid_value;
1342 mnt->acregmax = option;
1343 break;
1344 case Opt_acdirmin:
1345 if (nfs_get_option_ul(args, &option))
1346 goto out_invalid_value;
1347 mnt->acdirmin = option;
1348 break;
1349 case Opt_acdirmax:
1350 if (nfs_get_option_ul(args, &option))
1351 goto out_invalid_value;
1352 mnt->acdirmax = option;
1353 break;
1354 case Opt_actimeo:
1355 if (nfs_get_option_ul(args, &option))
1356 goto out_invalid_value;
1357 mnt->acregmin = mnt->acregmax =
1358 mnt->acdirmin = mnt->acdirmax = option;
1359 break;
1360 case Opt_namelen:
1361 if (nfs_get_option_ul(args, &option))
1362 goto out_invalid_value;
1363 mnt->namlen = option;
1364 break;
1365 case Opt_mountport:
1366 if (nfs_get_option_ul(args, &option) ||
1367 option > USHRT_MAX)
1368 goto out_invalid_value;
1369 mnt->mount_server.port = option;
1370 break;
1371 case Opt_mountvers:
1372 if (nfs_get_option_ul(args, &option) ||
1373 option < NFS_MNT_VERSION ||
1374 option > NFS_MNT3_VERSION)
1375 goto out_invalid_value;
1376 mnt->mount_server.version = option;
1377 break;
1378 case Opt_minorversion:
1379 if (nfs_get_option_ul(args, &option))
1380 goto out_invalid_value;
1381 if (option > NFS4_MAX_MINOR_VERSION)
1382 goto out_invalid_value;
1383 mnt->minorversion = option;
1384 break;
1385
1386 /*
1387 * options that take text values
1388 */
1389 case Opt_nfsvers:
1390 string = match_strdup(args);
1391 if (string == NULL)
1392 goto out_nomem;
1393 rc = nfs_parse_version_string(string, mnt, args);
1394 kfree(string);
1395 if (!rc)
1396 goto out_invalid_value;
1397 break;
1398 case Opt_sec:
1399 string = match_strdup(args);
1400 if (string == NULL)
1401 goto out_nomem;
1402 rc = nfs_parse_security_flavors(string, mnt);
1403 kfree(string);
1404 if (!rc) {
1405 dfprintk(MOUNT, "NFS: unrecognized "
1406 "security flavor\n");
1407 return 0;
1408 }
1409 break;
1410 case Opt_proto:
1411 string = match_strdup(args);
1412 if (string == NULL)
1413 goto out_nomem;
1414 token = match_token(string,
1415 nfs_xprt_protocol_tokens, args);
1416
1417 protofamily = AF_INET;
1418 switch (token) {
1419 case Opt_xprt_udp6:
1420 protofamily = AF_INET6;
1421 case Opt_xprt_udp:
1422 mnt->flags &= ~NFS_MOUNT_TCP;
1423 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1424 break;
1425 case Opt_xprt_tcp6:
1426 protofamily = AF_INET6;
1427 case Opt_xprt_tcp:
1428 mnt->flags |= NFS_MOUNT_TCP;
1429 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1430 break;
1431 case Opt_xprt_rdma:
1432 /* vector side protocols to TCP */
1433 mnt->flags |= NFS_MOUNT_TCP;
1434 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1435 xprt_load_transport(string);
1436 break;
1437 default:
1438 dfprintk(MOUNT, "NFS: unrecognized "
1439 "transport protocol\n");
1440 kfree(string);
1441 return 0;
1442 }
1443 kfree(string);
1444 break;
1445 case Opt_mountproto:
1446 string = match_strdup(args);
1447 if (string == NULL)
1448 goto out_nomem;
1449 token = match_token(string,
1450 nfs_xprt_protocol_tokens, args);
1451 kfree(string);
1452
1453 mountfamily = AF_INET;
1454 switch (token) {
1455 case Opt_xprt_udp6:
1456 mountfamily = AF_INET6;
1457 case Opt_xprt_udp:
1458 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1459 break;
1460 case Opt_xprt_tcp6:
1461 mountfamily = AF_INET6;
1462 case Opt_xprt_tcp:
1463 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1464 break;
1465 case Opt_xprt_rdma: /* not used for side protocols */
1466 default:
1467 dfprintk(MOUNT, "NFS: unrecognized "
1468 "transport protocol\n");
1469 return 0;
1470 }
1471 break;
1472 case Opt_addr:
1473 string = match_strdup(args);
1474 if (string == NULL)
1475 goto out_nomem;
1476 mnt->nfs_server.addrlen =
1477 rpc_pton(mnt->net, string, strlen(string),
1478 (struct sockaddr *)
1479 &mnt->nfs_server.address,
1480 sizeof(mnt->nfs_server.address));
1481 kfree(string);
1482 if (mnt->nfs_server.addrlen == 0)
1483 goto out_invalid_address;
1484 break;
1485 case Opt_clientaddr:
1486 if (nfs_get_option_str(args, &mnt->client_address))
1487 goto out_nomem;
1488 break;
1489 case Opt_mounthost:
1490 if (nfs_get_option_str(args,
1491 &mnt->mount_server.hostname))
1492 goto out_nomem;
1493 break;
1494 case Opt_mountaddr:
1495 string = match_strdup(args);
1496 if (string == NULL)
1497 goto out_nomem;
1498 mnt->mount_server.addrlen =
1499 rpc_pton(mnt->net, string, strlen(string),
1500 (struct sockaddr *)
1501 &mnt->mount_server.address,
1502 sizeof(mnt->mount_server.address));
1503 kfree(string);
1504 if (mnt->mount_server.addrlen == 0)
1505 goto out_invalid_address;
1506 break;
1507 case Opt_lookupcache:
1508 string = match_strdup(args);
1509 if (string == NULL)
1510 goto out_nomem;
1511 token = match_token(string,
1512 nfs_lookupcache_tokens, args);
1513 kfree(string);
1514 switch (token) {
1515 case Opt_lookupcache_all:
1516 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1517 break;
1518 case Opt_lookupcache_positive:
1519 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1520 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1521 break;
1522 case Opt_lookupcache_none:
1523 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1524 break;
1525 default:
1526 dfprintk(MOUNT, "NFS: invalid "
1527 "lookupcache argument\n");
1528 return 0;
1529 };
1530 break;
1531 case Opt_fscache_uniq:
1532 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1533 goto out_nomem;
1534 mnt->options |= NFS_OPTION_FSCACHE;
1535 break;
1536 case Opt_local_lock:
1537 string = match_strdup(args);
1538 if (string == NULL)
1539 goto out_nomem;
1540 token = match_token(string, nfs_local_lock_tokens,
1541 args);
1542 kfree(string);
1543 switch (token) {
1544 case Opt_local_lock_all:
1545 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1546 NFS_MOUNT_LOCAL_FCNTL);
1547 break;
1548 case Opt_local_lock_flock:
1549 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1550 break;
1551 case Opt_local_lock_posix:
1552 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1553 break;
1554 case Opt_local_lock_none:
1555 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1556 NFS_MOUNT_LOCAL_FCNTL);
1557 break;
1558 default:
1559 dfprintk(MOUNT, "NFS: invalid "
1560 "local_lock argument\n");
1561 return 0;
1562 };
1563 break;
1564
1565 /*
1566 * Special options
1567 */
1568 case Opt_sloppy:
1569 sloppy = 1;
1570 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1571 break;
1572 case Opt_userspace:
1573 case Opt_deprecated:
1574 dfprintk(MOUNT, "NFS: ignoring mount option "
1575 "'%s'\n", p);
1576 break;
1577
1578 default:
1579 invalid_option = 1;
1580 dfprintk(MOUNT, "NFS: unrecognized mount option "
1581 "'%s'\n", p);
1582 }
1583 }
1584
1585 if (!sloppy && invalid_option)
1586 return 0;
1587
1588 if (mnt->minorversion && mnt->version != 4)
1589 goto out_minorversion_mismatch;
1590
1591 /*
1592 * verify that any proto=/mountproto= options match the address
1593 * familiies in the addr=/mountaddr= options.
1594 */
1595 if (protofamily != AF_UNSPEC &&
1596 protofamily != mnt->nfs_server.address.ss_family)
1597 goto out_proto_mismatch;
1598
1599 if (mountfamily != AF_UNSPEC) {
1600 if (mnt->mount_server.addrlen) {
1601 if (mountfamily != mnt->mount_server.address.ss_family)
1602 goto out_mountproto_mismatch;
1603 } else {
1604 if (mountfamily != mnt->nfs_server.address.ss_family)
1605 goto out_mountproto_mismatch;
1606 }
1607 }
1608
1609 return 1;
1610
1611out_mountproto_mismatch:
1612 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1613 "option\n");
1614 return 0;
1615out_proto_mismatch:
1616 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1617 return 0;
1618out_invalid_address:
1619 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1620 return 0;
1621out_invalid_value:
1622 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1623 return 0;
1624out_minorversion_mismatch:
1625 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1626 "minorversion=%u\n", mnt->version, mnt->minorversion);
1627 return 0;
1628out_nomem:
1629 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1630 return 0;
1631out_security_failure:
1632 free_secdata(secdata);
1633 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1634 return 0;
1635}
1636
1637/*
1638 * Match the requested auth flavors with the list returned by
1639 * the server. Returns zero and sets the mount's authentication
1640 * flavor on success; returns -EACCES if server does not support
1641 * the requested flavor.
1642 */
1643static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1644 struct nfs_mount_request *request)
1645{
1646 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1647
1648 /*
1649 * Certain releases of Linux's mountd return an empty
1650 * flavor list. To prevent behavioral regression with
1651 * these servers (ie. rejecting mounts that used to
1652 * succeed), revert to pre-2.6.32 behavior (no checking)
1653 * if the returned flavor list is empty.
1654 */
1655 if (server_authlist_len == 0)
1656 return 0;
1657
1658 /*
1659 * We avoid sophisticated negotiating here, as there are
1660 * plenty of cases where we can get it wrong, providing
1661 * either too little or too much security.
1662 *
1663 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1664 * flavor listed first. However, some servers list
1665 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1666 * preferred default, in args->auth_flavors[0] if user
1667 * didn't specify sec= mount option.
1668 */
1669 for (i = 0; i < args->auth_flavor_len; i++)
1670 for (j = 0; j < server_authlist_len; j++)
1671 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1672 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1673 request->auth_flavs[j]);
1674 args->auth_flavors[0] = request->auth_flavs[j];
1675 return 0;
1676 }
1677
1678 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1679 nfs_umount(request);
1680 return -EACCES;
1681}
1682
1683/*
1684 * Use the remote server's MOUNT service to request the NFS file handle
1685 * corresponding to the provided path.
1686 */
1687static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1688 struct nfs_fh *root_fh)
1689{
1690 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1691 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1692 struct nfs_mount_request request = {
1693 .sap = (struct sockaddr *)
1694 &args->mount_server.address,
1695 .dirpath = args->nfs_server.export_path,
1696 .protocol = args->mount_server.protocol,
1697 .fh = root_fh,
1698 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1699 .auth_flav_len = &server_authlist_len,
1700 .auth_flavs = server_authlist,
1701 .net = args->net,
1702 };
1703 int status;
1704
1705 if (args->mount_server.version == 0) {
1706 switch (args->version) {
1707 default:
1708 args->mount_server.version = NFS_MNT3_VERSION;
1709 break;
1710 case 2:
1711 args->mount_server.version = NFS_MNT_VERSION;
1712 }
1713 }
1714 request.version = args->mount_server.version;
1715
1716 if (args->mount_server.hostname)
1717 request.hostname = args->mount_server.hostname;
1718 else
1719 request.hostname = args->nfs_server.hostname;
1720
1721 /*
1722 * Construct the mount server's address.
1723 */
1724 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1725 memcpy(request.sap, &args->nfs_server.address,
1726 args->nfs_server.addrlen);
1727 args->mount_server.addrlen = args->nfs_server.addrlen;
1728 }
1729 request.salen = args->mount_server.addrlen;
1730 nfs_set_port(request.sap, &args->mount_server.port, 0);
1731
1732 /*
1733 * Now ask the mount server to map our export path
1734 * to a file handle.
1735 */
1736 status = nfs_mount(&request);
1737 if (status != 0) {
1738 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1739 request.hostname, status);
1740 return status;
1741 }
1742
1743 /*
1744 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1745 */
1746 if (args->mount_server.version != NFS_MNT3_VERSION)
1747 return 0;
1748 return nfs_walk_authlist(args, &request);
1749}
1750
1751static struct dentry *nfs_try_mount(int flags, const char *dev_name,
1752 struct nfs_mount_info *mount_info)
1753{
1754 int status;
1755 struct nfs_server *server;
1756
1757 if (mount_info->parsed->need_mount) {
1758 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1759 if (status)
1760 return ERR_PTR(status);
1761 }
1762
1763 /* Get a volume representation */
1764 server = nfs_create_server(mount_info->parsed, mount_info->mntfh);
1765 if (IS_ERR(server))
1766 return ERR_CAST(server);
1767
1768 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info);
1769}
1770
1771/*
1772 * Split "dev_name" into "hostname:export_path".
1773 *
1774 * The leftmost colon demarks the split between the server's hostname
1775 * and the export path. If the hostname starts with a left square
1776 * bracket, then it may contain colons.
1777 *
1778 * Note: caller frees hostname and export path, even on error.
1779 */
1780static int nfs_parse_devname(const char *dev_name,
1781 char **hostname, size_t maxnamlen,
1782 char **export_path, size_t maxpathlen)
1783{
1784 size_t len;
1785 char *end;
1786
1787 /* Is the host name protected with square brakcets? */
1788 if (*dev_name == '[') {
1789 end = strchr(++dev_name, ']');
1790 if (end == NULL || end[1] != ':')
1791 goto out_bad_devname;
1792
1793 len = end - dev_name;
1794 end++;
1795 } else {
1796 char *comma;
1797
1798 end = strchr(dev_name, ':');
1799 if (end == NULL)
1800 goto out_bad_devname;
1801 len = end - dev_name;
1802
1803 /* kill possible hostname list: not supported */
1804 comma = strchr(dev_name, ',');
1805 if (comma != NULL && comma < end)
1806 *comma = 0;
1807 }
1808
1809 if (len > maxnamlen)
1810 goto out_hostname;
1811
1812 /* N.B. caller will free nfs_server.hostname in all cases */
1813 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1814 if (*hostname == NULL)
1815 goto out_nomem;
1816 len = strlen(++end);
1817 if (len > maxpathlen)
1818 goto out_path;
1819 *export_path = kstrndup(end, len, GFP_KERNEL);
1820 if (!*export_path)
1821 goto out_nomem;
1822
1823 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1824 return 0;
1825
1826out_bad_devname:
1827 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1828 return -EINVAL;
1829
1830out_nomem:
1831 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1832 return -ENOMEM;
1833
1834out_hostname:
1835 dfprintk(MOUNT, "NFS: server hostname too long\n");
1836 return -ENAMETOOLONG;
1837
1838out_path:
1839 dfprintk(MOUNT, "NFS: export pathname too long\n");
1840 return -ENAMETOOLONG;
1841}
1842
1843/*
1844 * Validate the NFS2/NFS3 mount data
1845 * - fills in the mount root filehandle
1846 *
1847 * For option strings, user space handles the following behaviors:
1848 *
1849 * + DNS: mapping server host name to IP address ("addr=" option)
1850 *
1851 * + failure mode: how to behave if a mount request can't be handled
1852 * immediately ("fg/bg" option)
1853 *
1854 * + retry: how often to retry a mount request ("retry=" option)
1855 *
1856 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1857 * mountproto=tcp after mountproto=udp, and so on
1858 */
1859static int nfs23_validate_mount_data(void *options,
1860 struct nfs_parsed_mount_data *args,
1861 struct nfs_fh *mntfh,
1862 const char *dev_name)
1863{
1864 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1865 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1866
1867 if (data == NULL)
1868 goto out_no_data;
1869
1870 args->version = NFS_DEFAULT_VERSION;
1871 switch (data->version) {
1872 case 1:
1873 data->namlen = 0;
1874 case 2:
1875 data->bsize = 0;
1876 case 3:
1877 if (data->flags & NFS_MOUNT_VER3)
1878 goto out_no_v3;
1879 data->root.size = NFS2_FHSIZE;
1880 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1881 case 4:
1882 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1883 goto out_no_sec;
1884 case 5:
1885 memset(data->context, 0, sizeof(data->context));
1886 case 6:
1887 if (data->flags & NFS_MOUNT_VER3) {
1888 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1889 goto out_invalid_fh;
1890 mntfh->size = data->root.size;
1891 args->version = 3;
1892 } else {
1893 mntfh->size = NFS2_FHSIZE;
1894 args->version = 2;
1895 }
1896
1897
1898 memcpy(mntfh->data, data->root.data, mntfh->size);
1899 if (mntfh->size < sizeof(mntfh->data))
1900 memset(mntfh->data + mntfh->size, 0,
1901 sizeof(mntfh->data) - mntfh->size);
1902
1903 /*
1904 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1905 * can deal with.
1906 */
1907 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1908 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1909 args->rsize = data->rsize;
1910 args->wsize = data->wsize;
1911 args->timeo = data->timeo;
1912 args->retrans = data->retrans;
1913 args->acregmin = data->acregmin;
1914 args->acregmax = data->acregmax;
1915 args->acdirmin = data->acdirmin;
1916 args->acdirmax = data->acdirmax;
1917 args->need_mount = false;
1918
1919 memcpy(sap, &data->addr, sizeof(data->addr));
1920 args->nfs_server.addrlen = sizeof(data->addr);
1921 args->nfs_server.port = ntohs(data->addr.sin_port);
1922 if (!nfs_verify_server_address(sap))
1923 goto out_no_address;
1924
1925 if (!(data->flags & NFS_MOUNT_TCP))
1926 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1927 /* N.B. caller will free nfs_server.hostname in all cases */
1928 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1929 args->namlen = data->namlen;
1930 args->bsize = data->bsize;
1931
1932 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1933 args->auth_flavors[0] = data->pseudoflavor;
1934 if (!args->nfs_server.hostname)
1935 goto out_nomem;
1936
1937 if (!(data->flags & NFS_MOUNT_NONLM))
1938 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1939 NFS_MOUNT_LOCAL_FCNTL);
1940 else
1941 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1942 NFS_MOUNT_LOCAL_FCNTL);
1943 /*
1944 * The legacy version 6 binary mount data from userspace has a
1945 * field used only to transport selinux information into the
1946 * the kernel. To continue to support that functionality we
1947 * have a touch of selinux knowledge here in the NFS code. The
1948 * userspace code converted context=blah to just blah so we are
1949 * converting back to the full string selinux understands.
1950 */
1951 if (data->context[0]){
1952#ifdef CONFIG_SECURITY_SELINUX
1953 int rc;
1954 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1955 if (!opts_str)
1956 return -ENOMEM;
1957 strcpy(opts_str, "context=");
1958 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1959 strcat(opts_str, &data->context[0]);
1960 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1961 kfree(opts_str);
1962 if (rc)
1963 return rc;
1964#else
1965 return -EINVAL;
1966#endif
1967 }
1968
1969 break;
1970 default:
1971 return NFS_TEXT_DATA;
1972 }
1973
1974#ifndef CONFIG_NFS_V3
1975 if (args->version == 3)
1976 goto out_v3_not_compiled;
1977#endif /* !CONFIG_NFS_V3 */
1978
1979 return 0;
1980
1981out_no_data:
1982 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1983 return -EINVAL;
1984
1985out_no_v3:
1986 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1987 data->version);
1988 return -EINVAL;
1989
1990out_no_sec:
1991 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1992 return -EINVAL;
1993
1994#ifndef CONFIG_NFS_V3
1995out_v3_not_compiled:
1996 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1997 return -EPROTONOSUPPORT;
1998#endif /* !CONFIG_NFS_V3 */
1999
2000out_nomem:
2001 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2002 return -ENOMEM;
2003
2004out_no_address:
2005 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2006 return -EINVAL;
2007
2008out_invalid_fh:
2009 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2010 return -EINVAL;
2011}
2012
2013#ifdef CONFIG_NFS_V4
2014static int nfs_validate_mount_data(struct file_system_type *fs_type,
2015 void *options,
2016 struct nfs_parsed_mount_data *args,
2017 struct nfs_fh *mntfh,
2018 const char *dev_name)
2019{
2020 if (fs_type == &nfs_fs_type)
2021 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2022 return nfs4_validate_mount_data(options, args, dev_name);
2023}
2024#else
2025static int nfs_validate_mount_data(struct file_system_type *fs_type,
2026 void *options,
2027 struct nfs_parsed_mount_data *args,
2028 struct nfs_fh *mntfh,
2029 const char *dev_name)
2030{
2031 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2032}
2033#endif
2034
2035static int nfs_validate_text_mount_data(void *options,
2036 struct nfs_parsed_mount_data *args,
2037 const char *dev_name)
2038{
2039 int port = 0;
2040 int max_namelen = PAGE_SIZE;
2041 int max_pathlen = NFS_MAXPATHLEN;
2042 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2043
2044 if (nfs_parse_mount_options((char *)options, args) == 0)
2045 return -EINVAL;
2046
2047 if (!nfs_verify_server_address(sap))
2048 goto out_no_address;
2049
2050 if (args->version == 4) {
2051#ifdef CONFIG_NFS_V4
2052 port = NFS_PORT;
2053 max_namelen = NFS4_MAXNAMLEN;
2054 max_pathlen = NFS4_MAXPATHLEN;
2055 nfs_validate_transport_protocol(args);
2056 nfs4_validate_mount_flags(args);
2057#else
2058 goto out_v4_not_compiled;
2059#endif /* CONFIG_NFS_V4 */
2060 } else
2061 nfs_set_mount_transport_protocol(args);
2062
2063 nfs_set_port(sap, &args->nfs_server.port, port);
2064
2065 if (args->auth_flavor_len > 1)
2066 goto out_bad_auth;
2067
2068 return nfs_parse_devname(dev_name,
2069 &args->nfs_server.hostname,
2070 max_namelen,
2071 &args->nfs_server.export_path,
2072 max_pathlen);
2073
2074#ifndef CONFIG_NFS_V4
2075out_v4_not_compiled:
2076 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2077 return -EPROTONOSUPPORT;
2078#endif /* !CONFIG_NFS_V4 */
2079
2080out_no_address:
2081 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2082 return -EINVAL;
2083
2084out_bad_auth:
2085 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2086 return -EINVAL;
2087}
2088
2089static int
2090nfs_compare_remount_data(struct nfs_server *nfss,
2091 struct nfs_parsed_mount_data *data)
2092{
2093 if (data->flags != nfss->flags ||
2094 data->rsize != nfss->rsize ||
2095 data->wsize != nfss->wsize ||
2096 data->retrans != nfss->client->cl_timeout->to_retries ||
2097 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2098 data->acregmin != nfss->acregmin / HZ ||
2099 data->acregmax != nfss->acregmax / HZ ||
2100 data->acdirmin != nfss->acdirmin / HZ ||
2101 data->acdirmax != nfss->acdirmax / HZ ||
2102 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2103 data->nfs_server.port != nfss->port ||
2104 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2105 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2106 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2107 return -EINVAL;
2108
2109 return 0;
2110}
2111
2112static int
2113nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2114{
2115 int error;
2116 struct nfs_server *nfss = sb->s_fs_info;
2117 struct nfs_parsed_mount_data *data;
2118 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2119 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2120 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2121
2122 /*
2123 * Userspace mount programs that send binary options generally send
2124 * them populated with default values. We have no way to know which
2125 * ones were explicitly specified. Fall back to legacy behavior and
2126 * just return success.
2127 */
2128 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2129 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2130 options->version <= 6))))
2131 return 0;
2132
2133 data = kzalloc(sizeof(*data), GFP_KERNEL);
2134 if (data == NULL)
2135 return -ENOMEM;
2136
2137 /* fill out struct with values from existing mount */
2138 data->flags = nfss->flags;
2139 data->rsize = nfss->rsize;
2140 data->wsize = nfss->wsize;
2141 data->retrans = nfss->client->cl_timeout->to_retries;
2142 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2143 data->acregmin = nfss->acregmin / HZ;
2144 data->acregmax = nfss->acregmax / HZ;
2145 data->acdirmin = nfss->acdirmin / HZ;
2146 data->acdirmax = nfss->acdirmax / HZ;
2147 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2148 data->nfs_server.port = nfss->port;
2149 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2150 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2151 data->nfs_server.addrlen);
2152
2153 /* overwrite those values with any that were specified */
2154 error = nfs_parse_mount_options((char *)options, data);
2155 if (error < 0)
2156 goto out;
2157
2158 /*
2159 * noac is a special case. It implies -o sync, but that's not
2160 * necessarily reflected in the mtab options. do_remount_sb
2161 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2162 * remount options, so we have to explicitly reset it.
2163 */
2164 if (data->flags & NFS_MOUNT_NOAC)
2165 *flags |= MS_SYNCHRONOUS;
2166
2167 /* compare new mount options with old ones */
2168 error = nfs_compare_remount_data(nfss, data);
2169out:
2170 kfree(data);
2171 return error;
2172}
2173
2174/*
2175 * Initialise the common bits of the superblock
2176 */
2177static inline void nfs_initialise_sb(struct super_block *sb)
2178{
2179 struct nfs_server *server = NFS_SB(sb);
2180
2181 sb->s_magic = NFS_SUPER_MAGIC;
2182
2183 /* We probably want something more informative here */
2184 snprintf(sb->s_id, sizeof(sb->s_id),
2185 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2186
2187 if (sb->s_blocksize == 0)
2188 sb->s_blocksize = nfs_block_bits(server->wsize,
2189 &sb->s_blocksize_bits);
2190
2191 sb->s_bdi = &server->backing_dev_info;
2192
2193 nfs_super_set_maxbytes(sb, server->maxfilesize);
2194}
2195
2196/*
2197 * Finish setting up an NFS2/3 superblock
2198 */
2199static void nfs_fill_super(struct super_block *sb,
2200 struct nfs_mount_info *mount_info)
2201{
2202 struct nfs_parsed_mount_data *data = mount_info->parsed;
2203 struct nfs_server *server = NFS_SB(sb);
2204
2205 sb->s_blocksize_bits = 0;
2206 sb->s_blocksize = 0;
2207 if (data->bsize)
2208 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2209
2210 if (server->nfs_client->rpc_ops->version == 3) {
2211 /* The VFS shouldn't apply the umask to mode bits. We will do
2212 * so ourselves when necessary.
2213 */
2214 sb->s_flags |= MS_POSIXACL;
2215 sb->s_time_gran = 1;
2216 }
2217
2218 sb->s_op = &nfs_sops;
2219 nfs_initialise_sb(sb);
2220}
2221
2222/*
2223 * Finish setting up a cloned NFS2/3 superblock
2224 */
2225static void nfs_clone_super(struct super_block *sb,
2226 struct nfs_mount_info *mount_info)
2227{
2228 const struct super_block *old_sb = mount_info->cloned->sb;
2229 struct nfs_server *server = NFS_SB(sb);
2230
2231 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2232 sb->s_blocksize = old_sb->s_blocksize;
2233 sb->s_maxbytes = old_sb->s_maxbytes;
2234
2235 if (server->nfs_client->rpc_ops->version == 3) {
2236 /* The VFS shouldn't apply the umask to mode bits. We will do
2237 * so ourselves when necessary.
2238 */
2239 sb->s_flags |= MS_POSIXACL;
2240 sb->s_time_gran = 1;
2241 }
2242
2243 sb->s_op = old_sb->s_op;
2244 nfs_initialise_sb(sb);
2245}
2246
2247static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2248{
2249 const struct nfs_server *a = s->s_fs_info;
2250 const struct rpc_clnt *clnt_a = a->client;
2251 const struct rpc_clnt *clnt_b = b->client;
2252
2253 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2254 goto Ebusy;
2255 if (a->nfs_client != b->nfs_client)
2256 goto Ebusy;
2257 if (a->flags != b->flags)
2258 goto Ebusy;
2259 if (a->wsize != b->wsize)
2260 goto Ebusy;
2261 if (a->rsize != b->rsize)
2262 goto Ebusy;
2263 if (a->acregmin != b->acregmin)
2264 goto Ebusy;
2265 if (a->acregmax != b->acregmax)
2266 goto Ebusy;
2267 if (a->acdirmin != b->acdirmin)
2268 goto Ebusy;
2269 if (a->acdirmax != b->acdirmax)
2270 goto Ebusy;
2271 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2272 goto Ebusy;
2273 return 1;
2274Ebusy:
2275 return 0;
2276}
2277
2278struct nfs_sb_mountdata {
2279 struct nfs_server *server;
2280 int mntflags;
2281};
2282
2283static int nfs_set_super(struct super_block *s, void *data)
2284{
2285 struct nfs_sb_mountdata *sb_mntdata = data;
2286 struct nfs_server *server = sb_mntdata->server;
2287 int ret;
2288
2289 s->s_flags = sb_mntdata->mntflags;
2290 s->s_fs_info = server;
2291 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2292 ret = set_anon_super(s, server);
2293 if (ret == 0)
2294 server->s_dev = s->s_dev;
2295 return ret;
2296}
2297
2298static int nfs_compare_super_address(struct nfs_server *server1,
2299 struct nfs_server *server2)
2300{
2301 struct sockaddr *sap1, *sap2;
2302
2303 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2304 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2305
2306 if (sap1->sa_family != sap2->sa_family)
2307 return 0;
2308
2309 switch (sap1->sa_family) {
2310 case AF_INET: {
2311 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2312 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2313 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2314 return 0;
2315 if (sin1->sin_port != sin2->sin_port)
2316 return 0;
2317 break;
2318 }
2319 case AF_INET6: {
2320 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2321 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2322 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2323 return 0;
2324 if (sin1->sin6_port != sin2->sin6_port)
2325 return 0;
2326 break;
2327 }
2328 default:
2329 return 0;
2330 }
2331
2332 return 1;
2333}
2334
2335static int nfs_compare_super(struct super_block *sb, void *data)
2336{
2337 struct nfs_sb_mountdata *sb_mntdata = data;
2338 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2339 int mntflags = sb_mntdata->mntflags;
2340
2341 if (!nfs_compare_super_address(old, server))
2342 return 0;
2343 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2344 if (old->flags & NFS_MOUNT_UNSHARED)
2345 return 0;
2346 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2347 return 0;
2348 return nfs_compare_mount_options(sb, server, mntflags);
2349}
2350
2351#ifdef CONFIG_NFS_FSCACHE
2352static void nfs_get_cache_cookie(struct super_block *sb,
2353 struct nfs_parsed_mount_data *parsed,
2354 struct nfs_clone_mount *cloned)
2355{
2356 char *uniq = NULL;
2357 int ulen = 0;
2358
2359 if (parsed && parsed->fscache_uniq) {
2360 uniq = parsed->fscache_uniq;
2361 ulen = strlen(parsed->fscache_uniq);
2362 } else if (cloned) {
2363 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2364 if (mnt_s->fscache_key) {
2365 uniq = mnt_s->fscache_key->key.uniquifier;
2366 ulen = mnt_s->fscache_key->key.uniq_len;
2367 };
2368 }
2369
2370 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2371}
2372#else
2373static void nfs_get_cache_cookie(struct super_block *sb,
2374 struct nfs_parsed_mount_data *parsed,
2375 struct nfs_clone_mount *cloned)
2376{
2377}
2378#endif
2379
2380static int nfs_bdi_register(struct nfs_server *server)
2381{
2382 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2383}
2384
2385static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2386 struct nfs_mount_info *mount_info)
2387{
2388 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2389}
2390
2391static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2392 struct nfs_mount_info *mount_info)
2393{
2394 /* clone any lsm security options from the parent to the new sb */
2395 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2396 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2397 return -ESTALE;
2398 return 0;
2399}
2400
2401static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2402 struct nfs_server *server,
2403 int flags, const char *dev_name,
2404 struct nfs_mount_info *mount_info)
2405{
2406 struct super_block *s;
2407 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2408 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2409 struct nfs_sb_mountdata sb_mntdata = {
2410 .mntflags = flags,
2411 .server = server,
2412 };
2413 int error;
2414
2415 if (server->flags & NFS_MOUNT_UNSHARED)
2416 compare_super = NULL;
2417
2418 /* -o noac implies -o sync */
2419 if (server->flags & NFS_MOUNT_NOAC)
2420 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2421
2422 /* Get a superblock - note that we may end up sharing one that already exists */
2423 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2424 if (IS_ERR(s)) {
2425 mntroot = ERR_CAST(s);
2426 goto out_err_nosb;
2427 }
2428
2429 if (s->s_fs_info != server) {
2430 nfs_free_server(server);
2431 server = NULL;
2432 } else {
2433 error = nfs_bdi_register(server);
2434 if (error) {
2435 mntroot = ERR_PTR(error);
2436 goto error_splat_bdi;
2437 }
2438 }
2439
2440 if (!s->s_root) {
2441 /* initial superblock/root creation */
2442 mount_info->fill_super(s, mount_info);
2443 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2444 }
2445
2446 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2447 if (IS_ERR(mntroot))
2448 goto error_splat_super;
2449
2450 error = mount_info->set_security(s, mntroot, mount_info);
2451 if (error)
2452 goto error_splat_root;
2453
2454 s->s_flags |= MS_ACTIVE;
2455
2456out:
2457 return mntroot;
2458
2459out_err_nosb:
2460 nfs_free_server(server);
2461 goto out;
2462
2463error_splat_root:
2464 dput(mntroot);
2465 mntroot = ERR_PTR(error);
2466error_splat_super:
2467 if (server && !s->s_root)
2468 bdi_unregister(&server->backing_dev_info);
2469error_splat_bdi:
2470 deactivate_locked_super(s);
2471 goto out;
2472}
2473
2474static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2475 int flags, const char *dev_name, void *raw_data)
2476{
2477 struct nfs_mount_info mount_info = {
2478 .fill_super = nfs_fill_super,
2479 .set_security = nfs_set_sb_security,
2480 };
2481 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2482 int error;
2483
2484 mount_info.parsed = nfs_alloc_parsed_mount_data();
2485 mount_info.mntfh = nfs_alloc_fhandle();
2486 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2487 goto out;
2488
2489 /* Validate the mount data */
2490 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2491 if (error == NFS_TEXT_DATA)
2492 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2493 if (error < 0) {
2494 mntroot = ERR_PTR(error);
2495 goto out;
2496 }
2497
2498#ifdef CONFIG_NFS_V4
2499 if (mount_info.parsed->version == 4)
2500 mntroot = nfs4_try_mount(flags, dev_name, &mount_info);
2501 else
2502#endif /* CONFIG_NFS_V4 */
2503 mntroot = nfs_try_mount(flags, dev_name, &mount_info);
2504
2505out:
2506 nfs_free_parsed_mount_data(mount_info.parsed);
2507 nfs_free_fhandle(mount_info.mntfh);
2508 return mntroot;
2509}
2510
2511/*
2512 * Ensure that we unregister the bdi before kill_anon_super
2513 * releases the device name
2514 */
2515static void nfs_put_super(struct super_block *s)
2516{
2517 struct nfs_server *server = NFS_SB(s);
2518
2519 bdi_unregister(&server->backing_dev_info);
2520}
2521
2522/*
2523 * Destroy an NFS2/3 superblock
2524 */
2525static void nfs_kill_super(struct super_block *s)
2526{
2527 struct nfs_server *server = NFS_SB(s);
2528
2529 kill_anon_super(s);
2530 nfs_fscache_release_super_cookie(s);
2531 nfs_free_server(server);
2532}
2533
2534/*
2535 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2536 */
2537static struct dentry *
2538nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2539 const char *dev_name, struct nfs_mount_info *mount_info)
2540{
2541 struct nfs_clone_mount *data = mount_info->cloned;
2542 struct nfs_server *server;
2543 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2544 int error;
2545
2546 dprintk("--> nfs_xdev_mount_common()\n");
2547
2548 mount_info->mntfh = data->fh;
2549
2550 /* create a new volume representation */
2551 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2552 if (IS_ERR(server)) {
2553 error = PTR_ERR(server);
2554 goto out_err;
2555 }
2556
2557 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
2558 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2559out:
2560 return mntroot;
2561
2562out_err:
2563 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
2564 goto out;
2565}
2566
2567/*
2568 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2569 */
2570static struct dentry *
2571nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2572 const char *dev_name, void *raw_data)
2573{
2574 struct nfs_mount_info mount_info = {
2575 .fill_super = nfs_clone_super,
2576 .set_security = nfs_clone_sb_security,
2577 .cloned = raw_data,
2578 };
2579 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2580}
2581
2582#ifdef CONFIG_NFS_V4
2583
2584/*
2585 * Finish setting up a cloned NFS4 superblock
2586 */
2587static void nfs4_clone_super(struct super_block *sb,
2588 struct nfs_mount_info *mount_info)
2589{
2590 const struct super_block *old_sb = mount_info->cloned->sb;
2591 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2592 sb->s_blocksize = old_sb->s_blocksize;
2593 sb->s_maxbytes = old_sb->s_maxbytes;
2594 sb->s_time_gran = 1;
2595 sb->s_op = old_sb->s_op;
2596 /*
2597 * The VFS shouldn't apply the umask to mode bits. We will do
2598 * so ourselves when necessary.
2599 */
2600 sb->s_flags |= MS_POSIXACL;
2601 sb->s_xattr = old_sb->s_xattr;
2602 nfs_initialise_sb(sb);
2603}
2604
2605/*
2606 * Set up an NFS4 superblock
2607 */
2608static void nfs4_fill_super(struct super_block *sb,
2609 struct nfs_mount_info *mount_info)
2610{
2611 sb->s_time_gran = 1;
2612 sb->s_op = &nfs4_sops;
2613 /*
2614 * The VFS shouldn't apply the umask to mode bits. We will do
2615 * so ourselves when necessary.
2616 */
2617 sb->s_flags |= MS_POSIXACL;
2618 sb->s_xattr = nfs4_xattr_handlers;
2619 nfs_initialise_sb(sb);
2620}
2621
2622static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2623{
2624 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2625 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2626}
2627
2628/*
2629 * Validate NFSv4 mount options
2630 */
2631static int nfs4_validate_mount_data(void *options,
2632 struct nfs_parsed_mount_data *args,
2633 const char *dev_name)
2634{
2635 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2636 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2637 char *c;
2638
2639 if (data == NULL)
2640 goto out_no_data;
2641
2642 args->version = 4;
2643
2644 switch (data->version) {
2645 case 1:
2646 if (data->host_addrlen > sizeof(args->nfs_server.address))
2647 goto out_no_address;
2648 if (data->host_addrlen == 0)
2649 goto out_no_address;
2650 args->nfs_server.addrlen = data->host_addrlen;
2651 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2652 return -EFAULT;
2653 if (!nfs_verify_server_address(sap))
2654 goto out_no_address;
2655 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2656
2657 if (data->auth_flavourlen) {
2658 if (data->auth_flavourlen > 1)
2659 goto out_inval_auth;
2660 if (copy_from_user(&args->auth_flavors[0],
2661 data->auth_flavours,
2662 sizeof(args->auth_flavors[0])))
2663 return -EFAULT;
2664 }
2665
2666 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2667 if (IS_ERR(c))
2668 return PTR_ERR(c);
2669 args->nfs_server.hostname = c;
2670
2671 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2672 if (IS_ERR(c))
2673 return PTR_ERR(c);
2674 args->nfs_server.export_path = c;
2675 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2676
2677 c = strndup_user(data->client_addr.data, 16);
2678 if (IS_ERR(c))
2679 return PTR_ERR(c);
2680 args->client_address = c;
2681
2682 /*
2683 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2684 * can deal with.
2685 */
2686
2687 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2688 args->rsize = data->rsize;
2689 args->wsize = data->wsize;
2690 args->timeo = data->timeo;
2691 args->retrans = data->retrans;
2692 args->acregmin = data->acregmin;
2693 args->acregmax = data->acregmax;
2694 args->acdirmin = data->acdirmin;
2695 args->acdirmax = data->acdirmax;
2696 args->nfs_server.protocol = data->proto;
2697 nfs_validate_transport_protocol(args);
2698
2699 break;
2700 default:
2701 return NFS_TEXT_DATA;
2702 }
2703
2704 return 0;
2705
2706out_no_data:
2707 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2708 return -EINVAL;
2709
2710out_inval_auth:
2711 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2712 data->auth_flavourlen);
2713 return -EINVAL;
2714
2715out_no_address:
2716 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2717 return -EINVAL;
2718}
2719
2720/*
2721 * Get the superblock for the NFS4 root partition
2722 */
2723static struct dentry *
2724nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2725 const char *dev_name, void *info)
2726{
2727 struct nfs_mount_info *mount_info = info;
2728 struct nfs_server *server;
2729 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2730
2731 mount_info->fill_super = nfs4_fill_super;
2732 mount_info->set_security = nfs_set_sb_security;
2733
2734 /* Get a volume representation */
2735 server = nfs4_create_server(mount_info->parsed, mount_info->mntfh);
2736 if (IS_ERR(server)) {
2737 mntroot = ERR_CAST(server);
2738 goto out;
2739 }
2740
2741 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
2742
2743out:
2744 return mntroot;
2745}
2746
2747static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2748 int flags, void *data, const char *hostname)
2749{
2750 struct vfsmount *root_mnt;
2751 char *root_devname;
2752 size_t len;
2753
2754 len = strlen(hostname) + 5;
2755 root_devname = kmalloc(len, GFP_KERNEL);
2756 if (root_devname == NULL)
2757 return ERR_PTR(-ENOMEM);
2758 /* Does hostname needs to be enclosed in brackets? */
2759 if (strchr(hostname, ':'))
2760 snprintf(root_devname, len, "[%s]:/", hostname);
2761 else
2762 snprintf(root_devname, len, "%s:/", hostname);
2763 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2764 kfree(root_devname);
2765 return root_mnt;
2766}
2767
2768struct nfs_referral_count {
2769 struct list_head list;
2770 const struct task_struct *task;
2771 unsigned int referral_count;
2772};
2773
2774static LIST_HEAD(nfs_referral_count_list);
2775static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2776
2777static struct nfs_referral_count *nfs_find_referral_count(void)
2778{
2779 struct nfs_referral_count *p;
2780
2781 list_for_each_entry(p, &nfs_referral_count_list, list) {
2782 if (p->task == current)
2783 return p;
2784 }
2785 return NULL;
2786}
2787
2788#define NFS_MAX_NESTED_REFERRALS 2
2789
2790static int nfs_referral_loop_protect(void)
2791{
2792 struct nfs_referral_count *p, *new;
2793 int ret = -ENOMEM;
2794
2795 new = kmalloc(sizeof(*new), GFP_KERNEL);
2796 if (!new)
2797 goto out;
2798 new->task = current;
2799 new->referral_count = 1;
2800
2801 ret = 0;
2802 spin_lock(&nfs_referral_count_list_lock);
2803 p = nfs_find_referral_count();
2804 if (p != NULL) {
2805 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2806 ret = -ELOOP;
2807 else
2808 p->referral_count++;
2809 } else {
2810 list_add(&new->list, &nfs_referral_count_list);
2811 new = NULL;
2812 }
2813 spin_unlock(&nfs_referral_count_list_lock);
2814 kfree(new);
2815out:
2816 return ret;
2817}
2818
2819static void nfs_referral_loop_unprotect(void)
2820{
2821 struct nfs_referral_count *p;
2822
2823 spin_lock(&nfs_referral_count_list_lock);
2824 p = nfs_find_referral_count();
2825 p->referral_count--;
2826 if (p->referral_count == 0)
2827 list_del(&p->list);
2828 else
2829 p = NULL;
2830 spin_unlock(&nfs_referral_count_list_lock);
2831 kfree(p);
2832}
2833
2834static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2835 const char *export_path)
2836{
2837 struct dentry *dentry;
2838 int err;
2839
2840 if (IS_ERR(root_mnt))
2841 return ERR_CAST(root_mnt);
2842
2843 err = nfs_referral_loop_protect();
2844 if (err) {
2845 mntput(root_mnt);
2846 return ERR_PTR(err);
2847 }
2848
2849 dentry = mount_subtree(root_mnt, export_path);
2850 nfs_referral_loop_unprotect();
2851
2852 return dentry;
2853}
2854
2855static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2856 struct nfs_mount_info *mount_info)
2857{
2858 char *export_path;
2859 struct vfsmount *root_mnt;
2860 struct dentry *res;
2861 struct nfs_parsed_mount_data *data = mount_info->parsed;
2862
2863 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2864
2865 mount_info->fill_super = nfs4_fill_super;
2866
2867 export_path = data->nfs_server.export_path;
2868 data->nfs_server.export_path = "/";
2869 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info,
2870 data->nfs_server.hostname);
2871 data->nfs_server.export_path = export_path;
2872
2873 res = nfs_follow_remote_path(root_mnt, export_path);
2874
2875 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2876 IS_ERR(res) ? PTR_ERR(res) : 0,
2877 IS_ERR(res) ? " [error]" : "");
2878 return res;
2879}
2880
2881static void nfs4_kill_super(struct super_block *sb)
2882{
2883 struct nfs_server *server = NFS_SB(sb);
2884
2885 dprintk("--> %s\n", __func__);
2886 nfs_super_return_all_delegations(sb);
2887 kill_anon_super(sb);
2888 nfs_fscache_release_super_cookie(sb);
2889 nfs_free_server(server);
2890 dprintk("<-- %s\n", __func__);
2891}
2892
2893/*
2894 * Clone an NFS4 server record on xdev traversal (FSID-change)
2895 */
2896static struct dentry *
2897nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2898 const char *dev_name, void *raw_data)
2899{
2900 struct nfs_mount_info mount_info = {
2901 .fill_super = nfs4_clone_super,
2902 .set_security = nfs_clone_sb_security,
2903 .cloned = raw_data,
2904 };
2905 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
2906}
2907
2908static struct dentry *
2909nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2910 const char *dev_name, void *raw_data)
2911{
2912 struct nfs_mount_info mount_info = {
2913 .fill_super = nfs4_fill_super,
2914 .set_security = nfs_clone_sb_security,
2915 .cloned = raw_data,
2916 };
2917 struct nfs_server *server;
2918 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2919
2920 dprintk("--> nfs4_referral_get_sb()\n");
2921
2922 mount_info.mntfh = nfs_alloc_fhandle();
2923 if (mount_info.cloned == NULL || mount_info.mntfh == NULL)
2924 goto out;
2925
2926 /* create a new volume representation */
2927 server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh);
2928 if (IS_ERR(server)) {
2929 mntroot = ERR_CAST(server);
2930 goto out;
2931 }
2932
2933 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, &mount_info);
2934out:
2935 nfs_free_fhandle(mount_info.mntfh);
2936 return mntroot;
2937}
2938
2939/*
2940 * Create an NFS4 server record on referral traversal
2941 */
2942static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2943 int flags, const char *dev_name, void *raw_data)
2944{
2945 struct nfs_clone_mount *data = raw_data;
2946 char *export_path;
2947 struct vfsmount *root_mnt;
2948 struct dentry *res;
2949
2950 dprintk("--> nfs4_referral_mount()\n");
2951
2952 export_path = data->mnt_path;
2953 data->mnt_path = "/";
2954
2955 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2956 flags, data, data->hostname);
2957 data->mnt_path = export_path;
2958
2959 res = nfs_follow_remote_path(root_mnt, export_path);
2960 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2961 IS_ERR(res) ? PTR_ERR(res) : 0,
2962 IS_ERR(res) ? " [error]" : "");
2963 return res;
2964}
2965
2966MODULE_ALIAS("nfs4");
2967
2968#endif /* CONFIG_NFS_V4 */