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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
61#include "nfs4_fs.h"
62#include "callback.h"
63#include "delegation.h"
64#include "iostat.h"
65#include "internal.h"
66#include "fscache.h"
67#include "nfs4session.h"
68#include "pnfs.h"
69#include "nfs.h"
70
71#define NFSDBG_FACILITY NFSDBG_VFS
72
73const struct super_operations nfs_sops = {
74 .alloc_inode = nfs_alloc_inode,
75 .free_inode = nfs_free_inode,
76 .write_inode = nfs_write_inode,
77 .drop_inode = nfs_drop_inode,
78 .statfs = nfs_statfs,
79 .evict_inode = nfs_evict_inode,
80 .umount_begin = nfs_umount_begin,
81 .show_options = nfs_show_options,
82 .show_devname = nfs_show_devname,
83 .show_path = nfs_show_path,
84 .show_stats = nfs_show_stats,
85};
86EXPORT_SYMBOL_GPL(nfs_sops);
87
88#if IS_ENABLED(CONFIG_NFS_V4)
89static int __init register_nfs4_fs(void)
90{
91 return register_filesystem(&nfs4_fs_type);
92}
93
94static void unregister_nfs4_fs(void)
95{
96 unregister_filesystem(&nfs4_fs_type);
97}
98#else
99static int __init register_nfs4_fs(void)
100{
101 return 0;
102}
103
104static void unregister_nfs4_fs(void)
105{
106}
107#endif
108
109static struct shrinker acl_shrinker = {
110 .count_objects = nfs_access_cache_count,
111 .scan_objects = nfs_access_cache_scan,
112 .seeks = DEFAULT_SEEKS,
113};
114
115/*
116 * Register the NFS filesystems
117 */
118int __init register_nfs_fs(void)
119{
120 int ret;
121
122 ret = register_filesystem(&nfs_fs_type);
123 if (ret < 0)
124 goto error_0;
125
126 ret = register_nfs4_fs();
127 if (ret < 0)
128 goto error_1;
129
130 ret = nfs_register_sysctl();
131 if (ret < 0)
132 goto error_2;
133 ret = register_shrinker(&acl_shrinker);
134 if (ret < 0)
135 goto error_3;
136 return 0;
137error_3:
138 nfs_unregister_sysctl();
139error_2:
140 unregister_nfs4_fs();
141error_1:
142 unregister_filesystem(&nfs_fs_type);
143error_0:
144 return ret;
145}
146
147/*
148 * Unregister the NFS filesystems
149 */
150void __exit unregister_nfs_fs(void)
151{
152 unregister_shrinker(&acl_shrinker);
153 nfs_unregister_sysctl();
154 unregister_nfs4_fs();
155 unregister_filesystem(&nfs_fs_type);
156}
157
158bool nfs_sb_active(struct super_block *sb)
159{
160 struct nfs_server *server = NFS_SB(sb);
161
162 if (!atomic_inc_not_zero(&sb->s_active))
163 return false;
164 if (atomic_inc_return(&server->active) != 1)
165 atomic_dec(&sb->s_active);
166 return true;
167}
168EXPORT_SYMBOL_GPL(nfs_sb_active);
169
170void nfs_sb_deactive(struct super_block *sb)
171{
172 struct nfs_server *server = NFS_SB(sb);
173
174 if (atomic_dec_and_test(&server->active))
175 deactivate_super(sb);
176}
177EXPORT_SYMBOL_GPL(nfs_sb_deactive);
178
179static int __nfs_list_for_each_server(struct list_head *head,
180 int (*fn)(struct nfs_server *, void *),
181 void *data)
182{
183 struct nfs_server *server, *last = NULL;
184 int ret = 0;
185
186 rcu_read_lock();
187 list_for_each_entry_rcu(server, head, client_link) {
188 if (!(server->super && nfs_sb_active(server->super)))
189 continue;
190 rcu_read_unlock();
191 if (last)
192 nfs_sb_deactive(last->super);
193 last = server;
194 ret = fn(server, data);
195 if (ret)
196 goto out;
197 rcu_read_lock();
198 }
199 rcu_read_unlock();
200out:
201 if (last)
202 nfs_sb_deactive(last->super);
203 return ret;
204}
205
206int nfs_client_for_each_server(struct nfs_client *clp,
207 int (*fn)(struct nfs_server *, void *),
208 void *data)
209{
210 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data);
211}
212EXPORT_SYMBOL_GPL(nfs_client_for_each_server);
213
214/*
215 * Deliver file system statistics to userspace
216 */
217int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
218{
219 struct nfs_server *server = NFS_SB(dentry->d_sb);
220 unsigned char blockbits;
221 unsigned long blockres;
222 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
223 struct nfs_fsstat res;
224 int error = -ENOMEM;
225
226 res.fattr = nfs_alloc_fattr();
227 if (res.fattr == NULL)
228 goto out_err;
229
230 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
231 if (unlikely(error == -ESTALE)) {
232 struct dentry *pd_dentry;
233
234 pd_dentry = dget_parent(dentry);
235 nfs_zap_caches(d_inode(pd_dentry));
236 dput(pd_dentry);
237 }
238 nfs_free_fattr(res.fattr);
239 if (error < 0)
240 goto out_err;
241
242 buf->f_type = NFS_SUPER_MAGIC;
243
244 /*
245 * Current versions of glibc do not correctly handle the
246 * case where f_frsize != f_bsize. Eventually we want to
247 * report the value of wtmult in this field.
248 */
249 buf->f_frsize = dentry->d_sb->s_blocksize;
250
251 /*
252 * On most *nix systems, f_blocks, f_bfree, and f_bavail
253 * are reported in units of f_frsize. Linux hasn't had
254 * an f_frsize field in its statfs struct until recently,
255 * thus historically Linux's sys_statfs reports these
256 * fields in units of f_bsize.
257 */
258 buf->f_bsize = dentry->d_sb->s_blocksize;
259 blockbits = dentry->d_sb->s_blocksize_bits;
260 blockres = (1 << blockbits) - 1;
261 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
262 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
263 buf->f_bavail = (res.abytes + blockres) >> blockbits;
264
265 buf->f_files = res.tfiles;
266 buf->f_ffree = res.afiles;
267
268 buf->f_namelen = server->namelen;
269
270 return 0;
271
272 out_err:
273 dprintk("%s: statfs error = %d\n", __func__, -error);
274 return error;
275}
276EXPORT_SYMBOL_GPL(nfs_statfs);
277
278/*
279 * Map the security flavour number to a name
280 */
281static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
282{
283 static const struct {
284 rpc_authflavor_t flavour;
285 const char *str;
286 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
287 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
288 { RPC_AUTH_NULL, "null" },
289 { RPC_AUTH_UNIX, "sys" },
290 { RPC_AUTH_GSS_KRB5, "krb5" },
291 { RPC_AUTH_GSS_KRB5I, "krb5i" },
292 { RPC_AUTH_GSS_KRB5P, "krb5p" },
293 { RPC_AUTH_GSS_LKEY, "lkey" },
294 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
295 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
296 { RPC_AUTH_GSS_SPKM, "spkm" },
297 { RPC_AUTH_GSS_SPKMI, "spkmi" },
298 { RPC_AUTH_GSS_SPKMP, "spkmp" },
299 { UINT_MAX, "unknown" }
300 };
301 int i;
302
303 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
304 if (sec_flavours[i].flavour == flavour)
305 break;
306 }
307 return sec_flavours[i].str;
308}
309
310static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
311 int showdefaults)
312{
313 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
314 char *proto = NULL;
315
316 switch (sap->sa_family) {
317 case AF_INET:
318 switch (nfss->mountd_protocol) {
319 case IPPROTO_UDP:
320 proto = RPCBIND_NETID_UDP;
321 break;
322 case IPPROTO_TCP:
323 proto = RPCBIND_NETID_TCP;
324 break;
325 }
326 break;
327 case AF_INET6:
328 switch (nfss->mountd_protocol) {
329 case IPPROTO_UDP:
330 proto = RPCBIND_NETID_UDP6;
331 break;
332 case IPPROTO_TCP:
333 proto = RPCBIND_NETID_TCP6;
334 break;
335 }
336 break;
337 }
338 if (proto || showdefaults)
339 seq_printf(m, ",mountproto=%s", proto ?: "auto");
340}
341
342static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
343 int showdefaults)
344{
345 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
346
347 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
348 return;
349
350 switch (sap->sa_family) {
351 case AF_INET: {
352 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
353 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
354 break;
355 }
356 case AF_INET6: {
357 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
358 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
359 break;
360 }
361 default:
362 if (showdefaults)
363 seq_puts(m, ",mountaddr=unspecified");
364 }
365
366 if (nfss->mountd_version || showdefaults)
367 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
368 if ((nfss->mountd_port &&
369 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
370 showdefaults)
371 seq_printf(m, ",mountport=%u", nfss->mountd_port);
372
373 nfs_show_mountd_netid(m, nfss, showdefaults);
374}
375
376#if IS_ENABLED(CONFIG_NFS_V4)
377static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
378 int showdefaults)
379{
380 struct nfs_client *clp = nfss->nfs_client;
381
382 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
383}
384#else
385static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
386 int showdefaults)
387{
388}
389#endif
390
391static void nfs_show_nfs_version(struct seq_file *m,
392 unsigned int version,
393 unsigned int minorversion)
394{
395 seq_printf(m, ",vers=%u", version);
396 if (version == 4)
397 seq_printf(m, ".%u", minorversion);
398}
399
400/*
401 * Describe the mount options in force on this server representation
402 */
403static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
404 int showdefaults)
405{
406 static const struct proc_nfs_info {
407 int flag;
408 const char *str;
409 const char *nostr;
410 } nfs_info[] = {
411 { NFS_MOUNT_SOFT, ",soft", "" },
412 { NFS_MOUNT_SOFTERR, ",softerr", "" },
413 { NFS_MOUNT_SOFTREVAL, ",softreval", "" },
414 { NFS_MOUNT_POSIX, ",posix", "" },
415 { NFS_MOUNT_NOCTO, ",nocto", "" },
416 { NFS_MOUNT_NOAC, ",noac", "" },
417 { NFS_MOUNT_NONLM, ",nolock", "" },
418 { NFS_MOUNT_NOACL, ",noacl", "" },
419 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
420 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
421 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
422 { 0, NULL, NULL }
423 };
424 const struct proc_nfs_info *nfs_infop;
425 struct nfs_client *clp = nfss->nfs_client;
426 u32 version = clp->rpc_ops->version;
427 int local_flock, local_fcntl;
428
429 nfs_show_nfs_version(m, version, clp->cl_minorversion);
430 seq_printf(m, ",rsize=%u", nfss->rsize);
431 seq_printf(m, ",wsize=%u", nfss->wsize);
432 if (nfss->bsize != 0)
433 seq_printf(m, ",bsize=%u", nfss->bsize);
434 seq_printf(m, ",namlen=%u", nfss->namelen);
435 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
436 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
437 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
438 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
439 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
440 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
441 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
442 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
443 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
444 seq_puts(m, ",hard");
445 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
446 if (nfss->flags & nfs_infop->flag)
447 seq_puts(m, nfs_infop->str);
448 else
449 seq_puts(m, nfs_infop->nostr);
450 }
451 rcu_read_lock();
452 seq_printf(m, ",proto=%s",
453 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
454 rcu_read_unlock();
455 if (clp->cl_nconnect > 0)
456 seq_printf(m, ",nconnect=%u", clp->cl_nconnect);
457 if (version == 4) {
458 if (nfss->port != NFS_PORT)
459 seq_printf(m, ",port=%u", nfss->port);
460 } else
461 if (nfss->port)
462 seq_printf(m, ",port=%u", nfss->port);
463
464 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
465 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
466 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
467
468 if (version != 4)
469 nfs_show_mountd_options(m, nfss, showdefaults);
470 else
471 nfs_show_nfsv4_options(m, nfss, showdefaults);
472
473 if (nfss->options & NFS_OPTION_FSCACHE)
474 seq_puts(m, ",fsc");
475
476 if (nfss->options & NFS_OPTION_MIGRATION)
477 seq_puts(m, ",migration");
478
479 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
480 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
481 seq_puts(m, ",lookupcache=none");
482 else
483 seq_puts(m, ",lookupcache=pos");
484 }
485
486 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
487 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
488
489 if (!local_flock && !local_fcntl)
490 seq_puts(m, ",local_lock=none");
491 else if (local_flock && local_fcntl)
492 seq_puts(m, ",local_lock=all");
493 else if (local_flock)
494 seq_puts(m, ",local_lock=flock");
495 else
496 seq_puts(m, ",local_lock=posix");
497}
498
499/*
500 * Describe the mount options on this VFS mountpoint
501 */
502int nfs_show_options(struct seq_file *m, struct dentry *root)
503{
504 struct nfs_server *nfss = NFS_SB(root->d_sb);
505
506 nfs_show_mount_options(m, nfss, 0);
507
508 rcu_read_lock();
509 seq_printf(m, ",addr=%s",
510 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
511 RPC_DISPLAY_ADDR));
512 rcu_read_unlock();
513
514 return 0;
515}
516EXPORT_SYMBOL_GPL(nfs_show_options);
517
518#if IS_ENABLED(CONFIG_NFS_V4)
519static void show_lease(struct seq_file *m, struct nfs_server *server)
520{
521 struct nfs_client *clp = server->nfs_client;
522 unsigned long expire;
523
524 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ);
525 expire = clp->cl_last_renewal + clp->cl_lease_time;
526 seq_printf(m, ",lease_expired=%ld",
527 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ);
528}
529#ifdef CONFIG_NFS_V4_1
530static void show_sessions(struct seq_file *m, struct nfs_server *server)
531{
532 if (nfs4_has_session(server->nfs_client))
533 seq_puts(m, ",sessions");
534}
535#else
536static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
537#endif
538#endif
539
540#ifdef CONFIG_NFS_V4_1
541static void show_pnfs(struct seq_file *m, struct nfs_server *server)
542{
543 seq_printf(m, ",pnfs=");
544 if (server->pnfs_curr_ld)
545 seq_printf(m, "%s", server->pnfs_curr_ld->name);
546 else
547 seq_printf(m, "not configured");
548}
549
550static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
551{
552 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
553 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
554 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
555 "date='%llu,%u'",
556 impl_id->name, impl_id->domain,
557 impl_id->date.seconds, impl_id->date.nseconds);
558 }
559}
560#else
561#if IS_ENABLED(CONFIG_NFS_V4)
562static void show_pnfs(struct seq_file *m, struct nfs_server *server)
563{
564}
565#endif
566static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
567{
568}
569#endif
570
571int nfs_show_devname(struct seq_file *m, struct dentry *root)
572{
573 char *page = (char *) __get_free_page(GFP_KERNEL);
574 char *devname, *dummy;
575 int err = 0;
576 if (!page)
577 return -ENOMEM;
578 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
579 if (IS_ERR(devname))
580 err = PTR_ERR(devname);
581 else
582 seq_escape(m, devname, " \t\n\\");
583 free_page((unsigned long)page);
584 return err;
585}
586EXPORT_SYMBOL_GPL(nfs_show_devname);
587
588int nfs_show_path(struct seq_file *m, struct dentry *dentry)
589{
590 seq_puts(m, "/");
591 return 0;
592}
593EXPORT_SYMBOL_GPL(nfs_show_path);
594
595/*
596 * Present statistical information for this VFS mountpoint
597 */
598int nfs_show_stats(struct seq_file *m, struct dentry *root)
599{
600 int i, cpu;
601 struct nfs_server *nfss = NFS_SB(root->d_sb);
602 struct rpc_auth *auth = nfss->client->cl_auth;
603 struct nfs_iostats totals = { };
604
605 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
606
607 /*
608 * Display all mount option settings
609 */
610 seq_puts(m, "\n\topts:\t");
611 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
612 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
613 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
614 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
615 nfs_show_mount_options(m, nfss, 1);
616
617 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
618
619 show_implementation_id(m, nfss);
620
621 seq_puts(m, "\n\tcaps:\t");
622 seq_printf(m, "caps=0x%x", nfss->caps);
623 seq_printf(m, ",wtmult=%u", nfss->wtmult);
624 seq_printf(m, ",dtsize=%u", nfss->dtsize);
625 seq_printf(m, ",bsize=%u", nfss->bsize);
626 seq_printf(m, ",namlen=%u", nfss->namelen);
627
628#if IS_ENABLED(CONFIG_NFS_V4)
629 if (nfss->nfs_client->rpc_ops->version == 4) {
630 seq_puts(m, "\n\tnfsv4:\t");
631 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
632 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
633 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
634 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
635 show_sessions(m, nfss);
636 show_pnfs(m, nfss);
637 show_lease(m, nfss);
638 }
639#endif
640
641 /*
642 * Display security flavor in effect for this mount
643 */
644 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
645 if (auth->au_flavor)
646 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
647
648 /*
649 * Display superblock I/O counters
650 */
651 for_each_possible_cpu(cpu) {
652 struct nfs_iostats *stats;
653
654 preempt_disable();
655 stats = per_cpu_ptr(nfss->io_stats, cpu);
656
657 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
658 totals.events[i] += stats->events[i];
659 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
660 totals.bytes[i] += stats->bytes[i];
661#ifdef CONFIG_NFS_FSCACHE
662 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
663 totals.fscache[i] += stats->fscache[i];
664#endif
665
666 preempt_enable();
667 }
668
669 seq_puts(m, "\n\tevents:\t");
670 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
671 seq_printf(m, "%lu ", totals.events[i]);
672 seq_puts(m, "\n\tbytes:\t");
673 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
674 seq_printf(m, "%Lu ", totals.bytes[i]);
675#ifdef CONFIG_NFS_FSCACHE
676 if (nfss->options & NFS_OPTION_FSCACHE) {
677 seq_puts(m, "\n\tfsc:\t");
678 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
679 seq_printf(m, "%Lu ", totals.fscache[i]);
680 }
681#endif
682 seq_putc(m, '\n');
683
684 rpc_clnt_show_stats(m, nfss->client);
685
686 return 0;
687}
688EXPORT_SYMBOL_GPL(nfs_show_stats);
689
690/*
691 * Begin unmount by attempting to remove all automounted mountpoints we added
692 * in response to xdev traversals and referrals
693 */
694void nfs_umount_begin(struct super_block *sb)
695{
696 struct nfs_server *server;
697 struct rpc_clnt *rpc;
698
699 server = NFS_SB(sb);
700 /* -EIO all pending I/O */
701 rpc = server->client_acl;
702 if (!IS_ERR(rpc))
703 rpc_killall_tasks(rpc);
704 rpc = server->client;
705 if (!IS_ERR(rpc))
706 rpc_killall_tasks(rpc);
707}
708EXPORT_SYMBOL_GPL(nfs_umount_begin);
709
710/*
711 * Return true if 'match' is in auth_info or auth_info is empty.
712 * Return false otherwise.
713 */
714bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
715 rpc_authflavor_t match)
716{
717 int i;
718
719 if (!auth_info->flavor_len)
720 return true;
721
722 for (i = 0; i < auth_info->flavor_len; i++) {
723 if (auth_info->flavors[i] == match)
724 return true;
725 }
726 return false;
727}
728EXPORT_SYMBOL_GPL(nfs_auth_info_match);
729
730/*
731 * Ensure that a specified authtype in ctx->auth_info is supported by
732 * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and
733 * -EACCES if not.
734 */
735static int nfs_verify_authflavors(struct nfs_fs_context *ctx,
736 rpc_authflavor_t *server_authlist,
737 unsigned int count)
738{
739 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
740 bool found_auth_null = false;
741 unsigned int i;
742
743 /*
744 * If the sec= mount option is used, the specified flavor or AUTH_NULL
745 * must be in the list returned by the server.
746 *
747 * AUTH_NULL has a special meaning when it's in the server list - it
748 * means that the server will ignore the rpc creds, so any flavor
749 * can be used but still use the sec= that was specified.
750 *
751 * Note also that the MNT procedure in MNTv1 does not return a list
752 * of supported security flavors. In this case, nfs_mount() fabricates
753 * a security flavor list containing just AUTH_NULL.
754 */
755 for (i = 0; i < count; i++) {
756 flavor = server_authlist[i];
757
758 if (nfs_auth_info_match(&ctx->auth_info, flavor))
759 goto out;
760
761 if (flavor == RPC_AUTH_NULL)
762 found_auth_null = true;
763 }
764
765 if (found_auth_null) {
766 flavor = ctx->auth_info.flavors[0];
767 goto out;
768 }
769
770 dfprintk(MOUNT,
771 "NFS: specified auth flavors not supported by server\n");
772 return -EACCES;
773
774out:
775 ctx->selected_flavor = flavor;
776 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor);
777 return 0;
778}
779
780/*
781 * Use the remote server's MOUNT service to request the NFS file handle
782 * corresponding to the provided path.
783 */
784static int nfs_request_mount(struct fs_context *fc,
785 struct nfs_fh *root_fh,
786 rpc_authflavor_t *server_authlist,
787 unsigned int *server_authlist_len)
788{
789 struct nfs_fs_context *ctx = nfs_fc2context(fc);
790 struct nfs_mount_request request = {
791 .sap = (struct sockaddr *)
792 &ctx->mount_server.address,
793 .dirpath = ctx->nfs_server.export_path,
794 .protocol = ctx->mount_server.protocol,
795 .fh = root_fh,
796 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT,
797 .auth_flav_len = server_authlist_len,
798 .auth_flavs = server_authlist,
799 .net = fc->net_ns,
800 };
801 int status;
802
803 if (ctx->mount_server.version == 0) {
804 switch (ctx->version) {
805 default:
806 ctx->mount_server.version = NFS_MNT3_VERSION;
807 break;
808 case 2:
809 ctx->mount_server.version = NFS_MNT_VERSION;
810 }
811 }
812 request.version = ctx->mount_server.version;
813
814 if (ctx->mount_server.hostname)
815 request.hostname = ctx->mount_server.hostname;
816 else
817 request.hostname = ctx->nfs_server.hostname;
818
819 /*
820 * Construct the mount server's address.
821 */
822 if (ctx->mount_server.address.sa_family == AF_UNSPEC) {
823 memcpy(request.sap, &ctx->nfs_server.address,
824 ctx->nfs_server.addrlen);
825 ctx->mount_server.addrlen = ctx->nfs_server.addrlen;
826 }
827 request.salen = ctx->mount_server.addrlen;
828 nfs_set_port(request.sap, &ctx->mount_server.port, 0);
829
830 /*
831 * Now ask the mount server to map our export path
832 * to a file handle.
833 */
834 status = nfs_mount(&request);
835 if (status != 0) {
836 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
837 request.hostname, status);
838 return status;
839 }
840
841 return 0;
842}
843
844static struct nfs_server *nfs_try_mount_request(struct fs_context *fc)
845{
846 struct nfs_fs_context *ctx = nfs_fc2context(fc);
847 int status;
848 unsigned int i;
849 bool tried_auth_unix = false;
850 bool auth_null_in_list = false;
851 struct nfs_server *server = ERR_PTR(-EACCES);
852 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
853 unsigned int authlist_len = ARRAY_SIZE(authlist);
854
855 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len);
856 if (status)
857 return ERR_PTR(status);
858
859 /*
860 * Was a sec= authflavor specified in the options? First, verify
861 * whether the server supports it, and then just try to use it if so.
862 */
863 if (ctx->auth_info.flavor_len > 0) {
864 status = nfs_verify_authflavors(ctx, authlist, authlist_len);
865 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
866 ctx->selected_flavor);
867 if (status)
868 return ERR_PTR(status);
869 return ctx->nfs_mod->rpc_ops->create_server(fc);
870 }
871
872 /*
873 * No sec= option was provided. RFC 2623, section 2.7 suggests we
874 * SHOULD prefer the flavor listed first. However, some servers list
875 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
876 */
877 for (i = 0; i < authlist_len; ++i) {
878 rpc_authflavor_t flavor;
879 struct rpcsec_gss_info info;
880
881 flavor = authlist[i];
882 switch (flavor) {
883 case RPC_AUTH_UNIX:
884 tried_auth_unix = true;
885 break;
886 case RPC_AUTH_NULL:
887 auth_null_in_list = true;
888 continue;
889 default:
890 if (rpcauth_get_gssinfo(flavor, &info) != 0)
891 continue;
892 /* Fallthrough */
893 }
894 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
895 ctx->selected_flavor = flavor;
896 server = ctx->nfs_mod->rpc_ops->create_server(fc);
897 if (!IS_ERR(server))
898 return server;
899 }
900
901 /*
902 * Nothing we tried so far worked. At this point, give up if we've
903 * already tried AUTH_UNIX or if the server's list doesn't contain
904 * AUTH_NULL
905 */
906 if (tried_auth_unix || !auth_null_in_list)
907 return server;
908
909 /* Last chance! Try AUTH_UNIX */
910 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
911 ctx->selected_flavor = RPC_AUTH_UNIX;
912 return ctx->nfs_mod->rpc_ops->create_server(fc);
913}
914
915int nfs_try_get_tree(struct fs_context *fc)
916{
917 struct nfs_fs_context *ctx = nfs_fc2context(fc);
918
919 if (ctx->need_mount)
920 ctx->server = nfs_try_mount_request(fc);
921 else
922 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc);
923
924 return nfs_get_tree_common(fc);
925}
926EXPORT_SYMBOL_GPL(nfs_try_get_tree);
927
928
929#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
930 | NFS_MOUNT_SECURE \
931 | NFS_MOUNT_TCP \
932 | NFS_MOUNT_VER3 \
933 | NFS_MOUNT_KERBEROS \
934 | NFS_MOUNT_NONLM \
935 | NFS_MOUNT_BROKEN_SUID \
936 | NFS_MOUNT_STRICTLOCK \
937 | NFS_MOUNT_LEGACY_INTERFACE)
938
939#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
940 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
941
942static int
943nfs_compare_remount_data(struct nfs_server *nfss,
944 struct nfs_fs_context *ctx)
945{
946 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
947 ctx->rsize != nfss->rsize ||
948 ctx->wsize != nfss->wsize ||
949 ctx->version != nfss->nfs_client->rpc_ops->version ||
950 ctx->minorversion != nfss->nfs_client->cl_minorversion ||
951 ctx->retrans != nfss->client->cl_timeout->to_retries ||
952 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) ||
953 ctx->acregmin != nfss->acregmin / HZ ||
954 ctx->acregmax != nfss->acregmax / HZ ||
955 ctx->acdirmin != nfss->acdirmin / HZ ||
956 ctx->acdirmax != nfss->acdirmax / HZ ||
957 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
958 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) ||
959 ctx->nfs_server.port != nfss->port ||
960 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
961 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address,
962 (struct sockaddr *)&nfss->nfs_client->cl_addr))
963 return -EINVAL;
964
965 return 0;
966}
967
968int nfs_reconfigure(struct fs_context *fc)
969{
970 struct nfs_fs_context *ctx = nfs_fc2context(fc);
971 struct super_block *sb = fc->root->d_sb;
972 struct nfs_server *nfss = sb->s_fs_info;
973
974 sync_filesystem(sb);
975
976 /*
977 * Userspace mount programs that send binary options generally send
978 * them populated with default values. We have no way to know which
979 * ones were explicitly specified. Fall back to legacy behavior and
980 * just return success.
981 */
982 if (ctx->skip_reconfig_option_check)
983 return 0;
984
985 /*
986 * noac is a special case. It implies -o sync, but that's not
987 * necessarily reflected in the mtab options. reconfigure_super
988 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
989 * remount options, so we have to explicitly reset it.
990 */
991 if (ctx->flags & NFS_MOUNT_NOAC) {
992 fc->sb_flags |= SB_SYNCHRONOUS;
993 fc->sb_flags_mask |= SB_SYNCHRONOUS;
994 }
995
996 /* compare new mount options with old ones */
997 return nfs_compare_remount_data(nfss, ctx);
998}
999EXPORT_SYMBOL_GPL(nfs_reconfigure);
1000
1001/*
1002 * Finish setting up an NFS superblock
1003 */
1004static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
1005{
1006 struct nfs_server *server = NFS_SB(sb);
1007
1008 sb->s_blocksize_bits = 0;
1009 sb->s_blocksize = 0;
1010 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
1011 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
1012 if (ctx && ctx->bsize)
1013 sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits);
1014
1015 if (server->nfs_client->rpc_ops->version != 2) {
1016 /* The VFS shouldn't apply the umask to mode bits. We will do
1017 * so ourselves when necessary.
1018 */
1019 sb->s_flags |= SB_POSIXACL;
1020 sb->s_time_gran = 1;
1021 sb->s_export_op = &nfs_export_ops;
1022 } else
1023 sb->s_time_gran = 1000;
1024
1025 if (server->nfs_client->rpc_ops->version != 4) {
1026 sb->s_time_min = 0;
1027 sb->s_time_max = U32_MAX;
1028 } else {
1029 sb->s_time_min = S64_MIN;
1030 sb->s_time_max = S64_MAX;
1031 }
1032
1033 sb->s_magic = NFS_SUPER_MAGIC;
1034
1035 /* We probably want something more informative here */
1036 snprintf(sb->s_id, sizeof(sb->s_id),
1037 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1038
1039 if (sb->s_blocksize == 0)
1040 sb->s_blocksize = nfs_block_bits(server->wsize,
1041 &sb->s_blocksize_bits);
1042
1043 nfs_super_set_maxbytes(sb, server->maxfilesize);
1044}
1045
1046static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b,
1047 const struct fs_context *fc)
1048{
1049 const struct nfs_server *a = s->s_fs_info;
1050 const struct rpc_clnt *clnt_a = a->client;
1051 const struct rpc_clnt *clnt_b = b->client;
1052
1053 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK))
1054 goto Ebusy;
1055 if (a->nfs_client != b->nfs_client)
1056 goto Ebusy;
1057 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
1058 goto Ebusy;
1059 if (a->wsize != b->wsize)
1060 goto Ebusy;
1061 if (a->rsize != b->rsize)
1062 goto Ebusy;
1063 if (a->acregmin != b->acregmin)
1064 goto Ebusy;
1065 if (a->acregmax != b->acregmax)
1066 goto Ebusy;
1067 if (a->acdirmin != b->acdirmin)
1068 goto Ebusy;
1069 if (a->acdirmax != b->acdirmax)
1070 goto Ebusy;
1071 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1072 goto Ebusy;
1073 return 1;
1074Ebusy:
1075 return 0;
1076}
1077
1078static int nfs_set_super(struct super_block *s, struct fs_context *fc)
1079{
1080 struct nfs_server *server = fc->s_fs_info;
1081 int ret;
1082
1083 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
1084 ret = set_anon_super(s, server);
1085 if (ret == 0)
1086 server->s_dev = s->s_dev;
1087 return ret;
1088}
1089
1090static int nfs_compare_super_address(struct nfs_server *server1,
1091 struct nfs_server *server2)
1092{
1093 struct sockaddr *sap1, *sap2;
1094 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
1095 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
1096
1097 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
1098 return 0;
1099
1100 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1101 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1102
1103 if (sap1->sa_family != sap2->sa_family)
1104 return 0;
1105
1106 switch (sap1->sa_family) {
1107 case AF_INET: {
1108 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1109 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1110 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1111 return 0;
1112 if (sin1->sin_port != sin2->sin_port)
1113 return 0;
1114 break;
1115 }
1116 case AF_INET6: {
1117 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1118 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1119 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1120 return 0;
1121 if (sin1->sin6_port != sin2->sin6_port)
1122 return 0;
1123 break;
1124 }
1125 default:
1126 return 0;
1127 }
1128
1129 return 1;
1130}
1131
1132static int nfs_compare_userns(const struct nfs_server *old,
1133 const struct nfs_server *new)
1134{
1135 const struct user_namespace *oldns = &init_user_ns;
1136 const struct user_namespace *newns = &init_user_ns;
1137
1138 if (old->client && old->client->cl_cred)
1139 oldns = old->client->cl_cred->user_ns;
1140 if (new->client && new->client->cl_cred)
1141 newns = new->client->cl_cred->user_ns;
1142 if (oldns != newns)
1143 return 0;
1144 return 1;
1145}
1146
1147static int nfs_compare_super(struct super_block *sb, struct fs_context *fc)
1148{
1149 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb);
1150
1151 if (!nfs_compare_super_address(old, server))
1152 return 0;
1153 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1154 if (old->flags & NFS_MOUNT_UNSHARED)
1155 return 0;
1156 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1157 return 0;
1158 if (!nfs_compare_userns(old, server))
1159 return 0;
1160 return nfs_compare_mount_options(sb, server, fc);
1161}
1162
1163#ifdef CONFIG_NFS_FSCACHE
1164static void nfs_get_cache_cookie(struct super_block *sb,
1165 struct nfs_fs_context *ctx)
1166{
1167 struct nfs_server *nfss = NFS_SB(sb);
1168 char *uniq = NULL;
1169 int ulen = 0;
1170
1171 nfss->fscache_key = NULL;
1172 nfss->fscache = NULL;
1173
1174 if (!ctx)
1175 return;
1176
1177 if (ctx->clone_data.sb) {
1178 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb);
1179 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
1180 return;
1181 if (mnt_s->fscache_key) {
1182 uniq = mnt_s->fscache_key->key.uniquifier;
1183 ulen = mnt_s->fscache_key->key.uniq_len;
1184 }
1185 } else {
1186 if (!(ctx->options & NFS_OPTION_FSCACHE))
1187 return;
1188 if (ctx->fscache_uniq) {
1189 uniq = ctx->fscache_uniq;
1190 ulen = strlen(ctx->fscache_uniq);
1191 }
1192 }
1193
1194 nfs_fscache_get_super_cookie(sb, uniq, ulen);
1195}
1196#else
1197static void nfs_get_cache_cookie(struct super_block *sb,
1198 struct nfs_fs_context *ctx)
1199{
1200}
1201#endif
1202
1203static void nfs_set_readahead(struct backing_dev_info *bdi,
1204 unsigned long iomax_pages)
1205{
1206 bdi->ra_pages = VM_READAHEAD_PAGES;
1207 bdi->io_pages = iomax_pages;
1208}
1209
1210int nfs_get_tree_common(struct fs_context *fc)
1211{
1212 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1213 struct super_block *s;
1214 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super;
1215 struct nfs_server *server = ctx->server;
1216 int error;
1217
1218 ctx->server = NULL;
1219 if (IS_ERR(server))
1220 return PTR_ERR(server);
1221
1222 if (server->flags & NFS_MOUNT_UNSHARED)
1223 compare_super = NULL;
1224
1225 /* -o noac implies -o sync */
1226 if (server->flags & NFS_MOUNT_NOAC)
1227 fc->sb_flags |= SB_SYNCHRONOUS;
1228
1229 if (ctx->clone_data.sb)
1230 if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS)
1231 fc->sb_flags |= SB_SYNCHRONOUS;
1232
1233 if (server->caps & NFS_CAP_SECURITY_LABEL)
1234 fc->lsm_flags |= SECURITY_LSM_NATIVE_LABELS;
1235
1236 /* Get a superblock - note that we may end up sharing one that already exists */
1237 fc->s_fs_info = server;
1238 s = sget_fc(fc, compare_super, nfs_set_super);
1239 fc->s_fs_info = NULL;
1240 if (IS_ERR(s)) {
1241 error = PTR_ERR(s);
1242 nfs_errorf(fc, "NFS: Couldn't get superblock");
1243 goto out_err_nosb;
1244 }
1245
1246 if (s->s_fs_info != server) {
1247 nfs_free_server(server);
1248 server = NULL;
1249 } else {
1250 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
1251 MINOR(server->s_dev));
1252 if (error)
1253 goto error_splat_super;
1254 nfs_set_readahead(s->s_bdi, server->rpages);
1255 server->super = s;
1256 }
1257
1258 if (!s->s_root) {
1259 unsigned bsize = ctx->clone_data.inherited_bsize;
1260 /* initial superblock/root creation */
1261 nfs_fill_super(s, ctx);
1262 if (bsize) {
1263 s->s_blocksize_bits = bsize;
1264 s->s_blocksize = 1U << bsize;
1265 }
1266 nfs_get_cache_cookie(s, ctx);
1267 }
1268
1269 error = nfs_get_root(s, fc);
1270 if (error < 0) {
1271 nfs_errorf(fc, "NFS: Couldn't get root dentry");
1272 goto error_splat_super;
1273 }
1274
1275 s->s_flags |= SB_ACTIVE;
1276 error = 0;
1277
1278out:
1279 return error;
1280
1281out_err_nosb:
1282 nfs_free_server(server);
1283 goto out;
1284error_splat_super:
1285 deactivate_locked_super(s);
1286 goto out;
1287}
1288
1289/*
1290 * Destroy an NFS2/3 superblock
1291 */
1292void nfs_kill_super(struct super_block *s)
1293{
1294 struct nfs_server *server = NFS_SB(s);
1295 dev_t dev = s->s_dev;
1296
1297 generic_shutdown_super(s);
1298
1299 nfs_fscache_release_super_cookie(s);
1300
1301 nfs_free_server(server);
1302 free_anon_bdev(dev);
1303}
1304EXPORT_SYMBOL_GPL(nfs_kill_super);
1305
1306#if IS_ENABLED(CONFIG_NFS_V4)
1307
1308/*
1309 * NFS v4 module parameters need to stay in the
1310 * NFS client for backwards compatibility
1311 */
1312unsigned int nfs_callback_set_tcpport;
1313unsigned short nfs_callback_nr_threads;
1314/* Default cache timeout is 10 minutes */
1315unsigned int nfs_idmap_cache_timeout = 600;
1316/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
1317bool nfs4_disable_idmapping = true;
1318unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
1319unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
1320unsigned short send_implementation_id = 1;
1321char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
1322bool recover_lost_locks = false;
1323
1324EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
1325EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
1326EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
1327EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
1328EXPORT_SYMBOL_GPL(max_session_slots);
1329EXPORT_SYMBOL_GPL(max_session_cb_slots);
1330EXPORT_SYMBOL_GPL(send_implementation_id);
1331EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
1332EXPORT_SYMBOL_GPL(recover_lost_locks);
1333
1334#define NFS_CALLBACK_MAXPORTNR (65535U)
1335
1336static int param_set_portnr(const char *val, const struct kernel_param *kp)
1337{
1338 unsigned long num;
1339 int ret;
1340
1341 if (!val)
1342 return -EINVAL;
1343 ret = kstrtoul(val, 0, &num);
1344 if (ret || num > NFS_CALLBACK_MAXPORTNR)
1345 return -EINVAL;
1346 *((unsigned int *)kp->arg) = num;
1347 return 0;
1348}
1349static const struct kernel_param_ops param_ops_portnr = {
1350 .set = param_set_portnr,
1351 .get = param_get_uint,
1352};
1353#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
1354
1355module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
1356module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
1357MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
1358 "assigned to the NFSv4 callback channels.");
1359module_param(nfs_idmap_cache_timeout, int, 0644);
1360module_param(nfs4_disable_idmapping, bool, 0644);
1361module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
1362 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
1363MODULE_PARM_DESC(nfs4_disable_idmapping,
1364 "Turn off NFSv4 idmapping when using 'sec=sys'");
1365module_param(max_session_slots, ushort, 0644);
1366MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
1367 "requests the client will negotiate");
1368module_param(max_session_cb_slots, ushort, 0644);
1369MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
1370 "callbacks the client will process for a given server");
1371module_param(send_implementation_id, ushort, 0644);
1372MODULE_PARM_DESC(send_implementation_id,
1373 "Send implementation ID with NFSv4.1 exchange_id");
1374MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
1375
1376module_param(recover_lost_locks, bool, 0644);
1377MODULE_PARM_DESC(recover_lost_locks,
1378 "If the server reports that a lock might be lost, "
1379 "try to recover it risking data corruption.");
1380
1381
1382#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/addr.h>
35#include <linux/sunrpc/stats.h>
36#include <linux/sunrpc/metrics.h>
37#include <linux/sunrpc/xprtsock.h>
38#include <linux/sunrpc/xprtrdma.h>
39#include <linux/nfs_fs.h>
40#include <linux/nfs_mount.h>
41#include <linux/nfs4_mount.h>
42#include <linux/lockd/bind.h>
43#include <linux/seq_file.h>
44#include <linux/mount.h>
45#include <linux/namei.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 "nfs4session.h"
67#include "pnfs.h"
68#include "nfs.h"
69
70#define NFSDBG_FACILITY NFSDBG_VFS
71#define NFS_TEXT_DATA 1
72
73#if IS_ENABLED(CONFIG_NFS_V3)
74#define NFS_DEFAULT_VERSION 3
75#else
76#define NFS_DEFAULT_VERSION 2
77#endif
78
79enum {
80 /* Mount options that take no arguments */
81 Opt_soft, Opt_hard,
82 Opt_posix, Opt_noposix,
83 Opt_cto, Opt_nocto,
84 Opt_ac, Opt_noac,
85 Opt_lock, Opt_nolock,
86 Opt_udp, Opt_tcp, Opt_rdma,
87 Opt_acl, Opt_noacl,
88 Opt_rdirplus, Opt_nordirplus,
89 Opt_sharecache, Opt_nosharecache,
90 Opt_resvport, Opt_noresvport,
91 Opt_fscache, Opt_nofscache,
92 Opt_migration, Opt_nomigration,
93
94 /* Mount options that take integer arguments */
95 Opt_port,
96 Opt_rsize, Opt_wsize, Opt_bsize,
97 Opt_timeo, Opt_retrans,
98 Opt_acregmin, Opt_acregmax,
99 Opt_acdirmin, Opt_acdirmax,
100 Opt_actimeo,
101 Opt_namelen,
102 Opt_mountport,
103 Opt_mountvers,
104 Opt_minorversion,
105
106 /* Mount options that take string arguments */
107 Opt_nfsvers,
108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
109 Opt_addr, Opt_mountaddr, Opt_clientaddr,
110 Opt_lookupcache,
111 Opt_fscache_uniq,
112 Opt_local_lock,
113
114 /* Special mount options */
115 Opt_userspace, Opt_deprecated, Opt_sloppy,
116
117 Opt_err
118};
119
120static const match_table_t nfs_mount_option_tokens = {
121 { Opt_userspace, "bg" },
122 { Opt_userspace, "fg" },
123 { Opt_userspace, "retry=%s" },
124
125 { Opt_sloppy, "sloppy" },
126
127 { Opt_soft, "soft" },
128 { Opt_hard, "hard" },
129 { Opt_deprecated, "intr" },
130 { Opt_deprecated, "nointr" },
131 { Opt_posix, "posix" },
132 { Opt_noposix, "noposix" },
133 { Opt_cto, "cto" },
134 { Opt_nocto, "nocto" },
135 { Opt_ac, "ac" },
136 { Opt_noac, "noac" },
137 { Opt_lock, "lock" },
138 { Opt_nolock, "nolock" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152 { Opt_migration, "migration" },
153 { Opt_nomigration, "nomigration" },
154
155 { Opt_port, "port=%s" },
156 { Opt_rsize, "rsize=%s" },
157 { Opt_wsize, "wsize=%s" },
158 { Opt_bsize, "bsize=%s" },
159 { Opt_timeo, "timeo=%s" },
160 { Opt_retrans, "retrans=%s" },
161 { Opt_acregmin, "acregmin=%s" },
162 { Opt_acregmax, "acregmax=%s" },
163 { Opt_acdirmin, "acdirmin=%s" },
164 { Opt_acdirmax, "acdirmax=%s" },
165 { Opt_actimeo, "actimeo=%s" },
166 { Opt_namelen, "namlen=%s" },
167 { Opt_mountport, "mountport=%s" },
168 { Opt_mountvers, "mountvers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_nfsvers, "nfsvers=%s" },
172 { Opt_nfsvers, "vers=%s" },
173
174 { Opt_sec, "sec=%s" },
175 { Opt_proto, "proto=%s" },
176 { Opt_mountproto, "mountproto=%s" },
177 { Opt_addr, "addr=%s" },
178 { Opt_clientaddr, "clientaddr=%s" },
179 { Opt_mounthost, "mounthost=%s" },
180 { Opt_mountaddr, "mountaddr=%s" },
181
182 { Opt_lookupcache, "lookupcache=%s" },
183 { Opt_fscache_uniq, "fsc=%s" },
184 { Opt_local_lock, "local_lock=%s" },
185
186 /* The following needs to be listed after all other options */
187 { Opt_nfsvers, "v%s" },
188
189 { Opt_err, NULL }
190};
191
192enum {
193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
194
195 Opt_xprt_err
196};
197
198static const match_table_t nfs_xprt_protocol_tokens = {
199 { Opt_xprt_udp, "udp" },
200 { Opt_xprt_udp6, "udp6" },
201 { Opt_xprt_tcp, "tcp" },
202 { Opt_xprt_tcp6, "tcp6" },
203 { Opt_xprt_rdma, "rdma" },
204
205 { Opt_xprt_err, NULL }
206};
207
208enum {
209 Opt_sec_none, Opt_sec_sys,
210 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
211 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
212 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
213
214 Opt_sec_err
215};
216
217static const match_table_t nfs_secflavor_tokens = {
218 { Opt_sec_none, "none" },
219 { Opt_sec_none, "null" },
220 { Opt_sec_sys, "sys" },
221
222 { Opt_sec_krb5, "krb5" },
223 { Opt_sec_krb5i, "krb5i" },
224 { Opt_sec_krb5p, "krb5p" },
225
226 { Opt_sec_lkey, "lkey" },
227 { Opt_sec_lkeyi, "lkeyi" },
228 { Opt_sec_lkeyp, "lkeyp" },
229
230 { Opt_sec_spkm, "spkm3" },
231 { Opt_sec_spkmi, "spkm3i" },
232 { Opt_sec_spkmp, "spkm3p" },
233
234 { Opt_sec_err, NULL }
235};
236
237enum {
238 Opt_lookupcache_all, Opt_lookupcache_positive,
239 Opt_lookupcache_none,
240
241 Opt_lookupcache_err
242};
243
244static match_table_t nfs_lookupcache_tokens = {
245 { Opt_lookupcache_all, "all" },
246 { Opt_lookupcache_positive, "pos" },
247 { Opt_lookupcache_positive, "positive" },
248 { Opt_lookupcache_none, "none" },
249
250 { Opt_lookupcache_err, NULL }
251};
252
253enum {
254 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
255 Opt_local_lock_none,
256
257 Opt_local_lock_err
258};
259
260static match_table_t nfs_local_lock_tokens = {
261 { Opt_local_lock_all, "all" },
262 { Opt_local_lock_flock, "flock" },
263 { Opt_local_lock_posix, "posix" },
264 { Opt_local_lock_none, "none" },
265
266 { Opt_local_lock_err, NULL }
267};
268
269enum {
270 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
271 Opt_vers_4_1, Opt_vers_4_2,
272
273 Opt_vers_err
274};
275
276static match_table_t nfs_vers_tokens = {
277 { Opt_vers_2, "2" },
278 { Opt_vers_3, "3" },
279 { Opt_vers_4, "4" },
280 { Opt_vers_4_0, "4.0" },
281 { Opt_vers_4_1, "4.1" },
282 { Opt_vers_4_2, "4.2" },
283
284 { Opt_vers_err, NULL }
285};
286
287static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data);
289
290struct file_system_type nfs_fs_type = {
291 .owner = THIS_MODULE,
292 .name = "nfs",
293 .mount = nfs_fs_mount,
294 .kill_sb = nfs_kill_super,
295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
296};
297MODULE_ALIAS_FS("nfs");
298EXPORT_SYMBOL_GPL(nfs_fs_type);
299
300struct file_system_type nfs_xdev_fs_type = {
301 .owner = THIS_MODULE,
302 .name = "nfs",
303 .mount = nfs_xdev_mount,
304 .kill_sb = nfs_kill_super,
305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
306};
307
308const struct super_operations nfs_sops = {
309 .alloc_inode = nfs_alloc_inode,
310 .destroy_inode = nfs_destroy_inode,
311 .write_inode = nfs_write_inode,
312 .drop_inode = nfs_drop_inode,
313 .statfs = nfs_statfs,
314 .evict_inode = nfs_evict_inode,
315 .umount_begin = nfs_umount_begin,
316 .show_options = nfs_show_options,
317 .show_devname = nfs_show_devname,
318 .show_path = nfs_show_path,
319 .show_stats = nfs_show_stats,
320 .remount_fs = nfs_remount,
321};
322EXPORT_SYMBOL_GPL(nfs_sops);
323
324#if IS_ENABLED(CONFIG_NFS_V4)
325static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
326static int nfs4_validate_mount_data(void *options,
327 struct nfs_parsed_mount_data *args, const char *dev_name);
328
329struct file_system_type nfs4_fs_type = {
330 .owner = THIS_MODULE,
331 .name = "nfs4",
332 .mount = nfs_fs_mount,
333 .kill_sb = nfs_kill_super,
334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
335};
336MODULE_ALIAS_FS("nfs4");
337MODULE_ALIAS("nfs4");
338EXPORT_SYMBOL_GPL(nfs4_fs_type);
339
340static int __init register_nfs4_fs(void)
341{
342 return register_filesystem(&nfs4_fs_type);
343}
344
345static void unregister_nfs4_fs(void)
346{
347 unregister_filesystem(&nfs4_fs_type);
348}
349#else
350static int __init register_nfs4_fs(void)
351{
352 return 0;
353}
354
355static void unregister_nfs4_fs(void)
356{
357}
358#endif
359
360static struct shrinker acl_shrinker = {
361 .count_objects = nfs_access_cache_count,
362 .scan_objects = nfs_access_cache_scan,
363 .seeks = DEFAULT_SEEKS,
364};
365
366/*
367 * Register the NFS filesystems
368 */
369int __init register_nfs_fs(void)
370{
371 int ret;
372
373 ret = register_filesystem(&nfs_fs_type);
374 if (ret < 0)
375 goto error_0;
376
377 ret = register_nfs4_fs();
378 if (ret < 0)
379 goto error_1;
380
381 ret = nfs_register_sysctl();
382 if (ret < 0)
383 goto error_2;
384 ret = register_shrinker(&acl_shrinker);
385 if (ret < 0)
386 goto error_3;
387 return 0;
388error_3:
389 nfs_unregister_sysctl();
390error_2:
391 unregister_nfs4_fs();
392error_1:
393 unregister_filesystem(&nfs_fs_type);
394error_0:
395 return ret;
396}
397
398/*
399 * Unregister the NFS filesystems
400 */
401void __exit unregister_nfs_fs(void)
402{
403 unregister_shrinker(&acl_shrinker);
404 nfs_unregister_sysctl();
405 unregister_nfs4_fs();
406 unregister_filesystem(&nfs_fs_type);
407}
408
409bool nfs_sb_active(struct super_block *sb)
410{
411 struct nfs_server *server = NFS_SB(sb);
412
413 if (!atomic_inc_not_zero(&sb->s_active))
414 return false;
415 if (atomic_inc_return(&server->active) != 1)
416 atomic_dec(&sb->s_active);
417 return true;
418}
419EXPORT_SYMBOL_GPL(nfs_sb_active);
420
421void nfs_sb_deactive(struct super_block *sb)
422{
423 struct nfs_server *server = NFS_SB(sb);
424
425 if (atomic_dec_and_test(&server->active))
426 deactivate_super(sb);
427}
428EXPORT_SYMBOL_GPL(nfs_sb_deactive);
429
430/*
431 * Deliver file system statistics to userspace
432 */
433int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
434{
435 struct nfs_server *server = NFS_SB(dentry->d_sb);
436 unsigned char blockbits;
437 unsigned long blockres;
438 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
439 struct nfs_fsstat res;
440 int error = -ENOMEM;
441
442 res.fattr = nfs_alloc_fattr();
443 if (res.fattr == NULL)
444 goto out_err;
445
446 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
447 if (unlikely(error == -ESTALE)) {
448 struct dentry *pd_dentry;
449
450 pd_dentry = dget_parent(dentry);
451 if (pd_dentry != NULL) {
452 nfs_zap_caches(d_inode(pd_dentry));
453 dput(pd_dentry);
454 }
455 }
456 nfs_free_fattr(res.fattr);
457 if (error < 0)
458 goto out_err;
459
460 buf->f_type = NFS_SUPER_MAGIC;
461
462 /*
463 * Current versions of glibc do not correctly handle the
464 * case where f_frsize != f_bsize. Eventually we want to
465 * report the value of wtmult in this field.
466 */
467 buf->f_frsize = dentry->d_sb->s_blocksize;
468
469 /*
470 * On most *nix systems, f_blocks, f_bfree, and f_bavail
471 * are reported in units of f_frsize. Linux hasn't had
472 * an f_frsize field in its statfs struct until recently,
473 * thus historically Linux's sys_statfs reports these
474 * fields in units of f_bsize.
475 */
476 buf->f_bsize = dentry->d_sb->s_blocksize;
477 blockbits = dentry->d_sb->s_blocksize_bits;
478 blockres = (1 << blockbits) - 1;
479 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
480 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
481 buf->f_bavail = (res.abytes + blockres) >> blockbits;
482
483 buf->f_files = res.tfiles;
484 buf->f_ffree = res.afiles;
485
486 buf->f_namelen = server->namelen;
487
488 return 0;
489
490 out_err:
491 dprintk("%s: statfs error = %d\n", __func__, -error);
492 return error;
493}
494EXPORT_SYMBOL_GPL(nfs_statfs);
495
496/*
497 * Map the security flavour number to a name
498 */
499static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
500{
501 static const struct {
502 rpc_authflavor_t flavour;
503 const char *str;
504 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
505 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
506 { RPC_AUTH_NULL, "null" },
507 { RPC_AUTH_UNIX, "sys" },
508 { RPC_AUTH_GSS_KRB5, "krb5" },
509 { RPC_AUTH_GSS_KRB5I, "krb5i" },
510 { RPC_AUTH_GSS_KRB5P, "krb5p" },
511 { RPC_AUTH_GSS_LKEY, "lkey" },
512 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
513 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
514 { RPC_AUTH_GSS_SPKM, "spkm" },
515 { RPC_AUTH_GSS_SPKMI, "spkmi" },
516 { RPC_AUTH_GSS_SPKMP, "spkmp" },
517 { UINT_MAX, "unknown" }
518 };
519 int i;
520
521 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
522 if (sec_flavours[i].flavour == flavour)
523 break;
524 }
525 return sec_flavours[i].str;
526}
527
528static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
529 int showdefaults)
530{
531 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
532
533 seq_printf(m, ",mountproto=");
534 switch (sap->sa_family) {
535 case AF_INET:
536 switch (nfss->mountd_protocol) {
537 case IPPROTO_UDP:
538 seq_printf(m, RPCBIND_NETID_UDP);
539 break;
540 case IPPROTO_TCP:
541 seq_printf(m, RPCBIND_NETID_TCP);
542 break;
543 default:
544 if (showdefaults)
545 seq_printf(m, "auto");
546 }
547 break;
548 case AF_INET6:
549 switch (nfss->mountd_protocol) {
550 case IPPROTO_UDP:
551 seq_printf(m, RPCBIND_NETID_UDP6);
552 break;
553 case IPPROTO_TCP:
554 seq_printf(m, RPCBIND_NETID_TCP6);
555 break;
556 default:
557 if (showdefaults)
558 seq_printf(m, "auto");
559 }
560 break;
561 default:
562 if (showdefaults)
563 seq_printf(m, "auto");
564 }
565}
566
567static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
568 int showdefaults)
569{
570 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
571
572 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
573 return;
574
575 switch (sap->sa_family) {
576 case AF_INET: {
577 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
578 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
579 break;
580 }
581 case AF_INET6: {
582 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
583 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
584 break;
585 }
586 default:
587 if (showdefaults)
588 seq_printf(m, ",mountaddr=unspecified");
589 }
590
591 if (nfss->mountd_version || showdefaults)
592 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
593 if ((nfss->mountd_port &&
594 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
595 showdefaults)
596 seq_printf(m, ",mountport=%u", nfss->mountd_port);
597
598 nfs_show_mountd_netid(m, nfss, showdefaults);
599}
600
601#if IS_ENABLED(CONFIG_NFS_V4)
602static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
603 int showdefaults)
604{
605 struct nfs_client *clp = nfss->nfs_client;
606
607 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
608}
609#else
610static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
611 int showdefaults)
612{
613}
614#endif
615
616static void nfs_show_nfs_version(struct seq_file *m,
617 unsigned int version,
618 unsigned int minorversion)
619{
620 seq_printf(m, ",vers=%u", version);
621 if (version == 4)
622 seq_printf(m, ".%u", minorversion);
623}
624
625/*
626 * Describe the mount options in force on this server representation
627 */
628static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
629 int showdefaults)
630{
631 static const struct proc_nfs_info {
632 int flag;
633 const char *str;
634 const char *nostr;
635 } nfs_info[] = {
636 { NFS_MOUNT_SOFT, ",soft", ",hard" },
637 { NFS_MOUNT_POSIX, ",posix", "" },
638 { NFS_MOUNT_NOCTO, ",nocto", "" },
639 { NFS_MOUNT_NOAC, ",noac", "" },
640 { NFS_MOUNT_NONLM, ",nolock", "" },
641 { NFS_MOUNT_NOACL, ",noacl", "" },
642 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
643 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
644 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
645 { 0, NULL, NULL }
646 };
647 const struct proc_nfs_info *nfs_infop;
648 struct nfs_client *clp = nfss->nfs_client;
649 u32 version = clp->rpc_ops->version;
650 int local_flock, local_fcntl;
651
652 nfs_show_nfs_version(m, version, clp->cl_minorversion);
653 seq_printf(m, ",rsize=%u", nfss->rsize);
654 seq_printf(m, ",wsize=%u", nfss->wsize);
655 if (nfss->bsize != 0)
656 seq_printf(m, ",bsize=%u", nfss->bsize);
657 seq_printf(m, ",namlen=%u", nfss->namelen);
658 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
659 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
660 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
661 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
662 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
663 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
664 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
665 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
666 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
667 if (nfss->flags & nfs_infop->flag)
668 seq_puts(m, nfs_infop->str);
669 else
670 seq_puts(m, nfs_infop->nostr);
671 }
672 rcu_read_lock();
673 seq_printf(m, ",proto=%s",
674 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
675 rcu_read_unlock();
676 if (version == 4) {
677 if (nfss->port != NFS_PORT)
678 seq_printf(m, ",port=%u", nfss->port);
679 } else
680 if (nfss->port)
681 seq_printf(m, ",port=%u", nfss->port);
682
683 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
684 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
685 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
686
687 if (version != 4)
688 nfs_show_mountd_options(m, nfss, showdefaults);
689 else
690 nfs_show_nfsv4_options(m, nfss, showdefaults);
691
692 if (nfss->options & NFS_OPTION_FSCACHE)
693 seq_printf(m, ",fsc");
694
695 if (nfss->options & NFS_OPTION_MIGRATION)
696 seq_printf(m, ",migration");
697
698 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
699 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
700 seq_printf(m, ",lookupcache=none");
701 else
702 seq_printf(m, ",lookupcache=pos");
703 }
704
705 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
706 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
707
708 if (!local_flock && !local_fcntl)
709 seq_printf(m, ",local_lock=none");
710 else if (local_flock && local_fcntl)
711 seq_printf(m, ",local_lock=all");
712 else if (local_flock)
713 seq_printf(m, ",local_lock=flock");
714 else
715 seq_printf(m, ",local_lock=posix");
716}
717
718/*
719 * Describe the mount options on this VFS mountpoint
720 */
721int nfs_show_options(struct seq_file *m, struct dentry *root)
722{
723 struct nfs_server *nfss = NFS_SB(root->d_sb);
724
725 nfs_show_mount_options(m, nfss, 0);
726
727 rcu_read_lock();
728 seq_printf(m, ",addr=%s",
729 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
730 RPC_DISPLAY_ADDR));
731 rcu_read_unlock();
732
733 return 0;
734}
735EXPORT_SYMBOL_GPL(nfs_show_options);
736
737#if IS_ENABLED(CONFIG_NFS_V4)
738#ifdef CONFIG_NFS_V4_1
739static void show_sessions(struct seq_file *m, struct nfs_server *server)
740{
741 if (nfs4_has_session(server->nfs_client))
742 seq_printf(m, ",sessions");
743}
744#else
745static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
746#endif
747#endif
748
749#ifdef CONFIG_NFS_V4_1
750static void show_pnfs(struct seq_file *m, struct nfs_server *server)
751{
752 seq_printf(m, ",pnfs=");
753 if (server->pnfs_curr_ld)
754 seq_printf(m, "%s", server->pnfs_curr_ld->name);
755 else
756 seq_printf(m, "not configured");
757}
758
759static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
760{
761 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
762 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
763 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
764 "date='%llu,%u'",
765 impl_id->name, impl_id->domain,
766 impl_id->date.seconds, impl_id->date.nseconds);
767 }
768}
769#else
770#if IS_ENABLED(CONFIG_NFS_V4)
771static void show_pnfs(struct seq_file *m, struct nfs_server *server)
772{
773}
774#endif
775static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
776{
777}
778#endif
779
780int nfs_show_devname(struct seq_file *m, struct dentry *root)
781{
782 char *page = (char *) __get_free_page(GFP_KERNEL);
783 char *devname, *dummy;
784 int err = 0;
785 if (!page)
786 return -ENOMEM;
787 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
788 if (IS_ERR(devname))
789 err = PTR_ERR(devname);
790 else
791 seq_escape(m, devname, " \t\n\\");
792 free_page((unsigned long)page);
793 return err;
794}
795EXPORT_SYMBOL_GPL(nfs_show_devname);
796
797int nfs_show_path(struct seq_file *m, struct dentry *dentry)
798{
799 seq_puts(m, "/");
800 return 0;
801}
802EXPORT_SYMBOL_GPL(nfs_show_path);
803
804/*
805 * Present statistical information for this VFS mountpoint
806 */
807int nfs_show_stats(struct seq_file *m, struct dentry *root)
808{
809 int i, cpu;
810 struct nfs_server *nfss = NFS_SB(root->d_sb);
811 struct rpc_auth *auth = nfss->client->cl_auth;
812 struct nfs_iostats totals = { };
813
814 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
815
816 /*
817 * Display all mount option settings
818 */
819 seq_printf(m, "\n\topts:\t");
820 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
821 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
822 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
823 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
824 nfs_show_mount_options(m, nfss, 1);
825
826 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
827
828 show_implementation_id(m, nfss);
829
830 seq_printf(m, "\n\tcaps:\t");
831 seq_printf(m, "caps=0x%x", nfss->caps);
832 seq_printf(m, ",wtmult=%u", nfss->wtmult);
833 seq_printf(m, ",dtsize=%u", nfss->dtsize);
834 seq_printf(m, ",bsize=%u", nfss->bsize);
835 seq_printf(m, ",namlen=%u", nfss->namelen);
836
837#if IS_ENABLED(CONFIG_NFS_V4)
838 if (nfss->nfs_client->rpc_ops->version == 4) {
839 seq_printf(m, "\n\tnfsv4:\t");
840 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
841 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
842 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
843 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
844 show_sessions(m, nfss);
845 show_pnfs(m, nfss);
846 }
847#endif
848
849 /*
850 * Display security flavor in effect for this mount
851 */
852 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
853 if (auth->au_flavor)
854 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
855
856 /*
857 * Display superblock I/O counters
858 */
859 for_each_possible_cpu(cpu) {
860 struct nfs_iostats *stats;
861
862 preempt_disable();
863 stats = per_cpu_ptr(nfss->io_stats, cpu);
864
865 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
866 totals.events[i] += stats->events[i];
867 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
868 totals.bytes[i] += stats->bytes[i];
869#ifdef CONFIG_NFS_FSCACHE
870 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
871 totals.fscache[i] += stats->fscache[i];
872#endif
873
874 preempt_enable();
875 }
876
877 seq_printf(m, "\n\tevents:\t");
878 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
879 seq_printf(m, "%lu ", totals.events[i]);
880 seq_printf(m, "\n\tbytes:\t");
881 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
882 seq_printf(m, "%Lu ", totals.bytes[i]);
883#ifdef CONFIG_NFS_FSCACHE
884 if (nfss->options & NFS_OPTION_FSCACHE) {
885 seq_printf(m, "\n\tfsc:\t");
886 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
887 seq_printf(m, "%Lu ", totals.bytes[i]);
888 }
889#endif
890 seq_printf(m, "\n");
891
892 rpc_print_iostats(m, nfss->client);
893
894 return 0;
895}
896EXPORT_SYMBOL_GPL(nfs_show_stats);
897
898/*
899 * Begin unmount by attempting to remove all automounted mountpoints we added
900 * in response to xdev traversals and referrals
901 */
902void nfs_umount_begin(struct super_block *sb)
903{
904 struct nfs_server *server;
905 struct rpc_clnt *rpc;
906
907 server = NFS_SB(sb);
908 /* -EIO all pending I/O */
909 rpc = server->client_acl;
910 if (!IS_ERR(rpc))
911 rpc_killall_tasks(rpc);
912 rpc = server->client;
913 if (!IS_ERR(rpc))
914 rpc_killall_tasks(rpc);
915}
916EXPORT_SYMBOL_GPL(nfs_umount_begin);
917
918static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
919{
920 struct nfs_parsed_mount_data *data;
921
922 data = kzalloc(sizeof(*data), GFP_KERNEL);
923 if (data) {
924 data->acregmin = NFS_DEF_ACREGMIN;
925 data->acregmax = NFS_DEF_ACREGMAX;
926 data->acdirmin = NFS_DEF_ACDIRMIN;
927 data->acdirmax = NFS_DEF_ACDIRMAX;
928 data->mount_server.port = NFS_UNSPEC_PORT;
929 data->nfs_server.port = NFS_UNSPEC_PORT;
930 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
931 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
932 data->minorversion = 0;
933 data->need_mount = true;
934 data->net = current->nsproxy->net_ns;
935 security_init_mnt_opts(&data->lsm_opts);
936 }
937 return data;
938}
939
940static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
941{
942 if (data) {
943 kfree(data->client_address);
944 kfree(data->mount_server.hostname);
945 kfree(data->nfs_server.export_path);
946 kfree(data->nfs_server.hostname);
947 kfree(data->fscache_uniq);
948 security_free_mnt_opts(&data->lsm_opts);
949 kfree(data);
950 }
951}
952
953/*
954 * Sanity-check a server address provided by the mount command.
955 *
956 * Address family must be initialized, and address must not be
957 * the ANY address for that family.
958 */
959static int nfs_verify_server_address(struct sockaddr *addr)
960{
961 switch (addr->sa_family) {
962 case AF_INET: {
963 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
964 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
965 }
966 case AF_INET6: {
967 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
968 return !ipv6_addr_any(sa);
969 }
970 }
971
972 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
973 return 0;
974}
975
976/*
977 * Select between a default port value and a user-specified port value.
978 * If a zero value is set, then autobind will be used.
979 */
980static void nfs_set_port(struct sockaddr *sap, int *port,
981 const unsigned short default_port)
982{
983 if (*port == NFS_UNSPEC_PORT)
984 *port = default_port;
985
986 rpc_set_port(sap, *port);
987}
988
989/*
990 * Sanity check the NFS transport protocol.
991 *
992 */
993static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
994{
995 switch (mnt->nfs_server.protocol) {
996 case XPRT_TRANSPORT_UDP:
997 case XPRT_TRANSPORT_TCP:
998 case XPRT_TRANSPORT_RDMA:
999 break;
1000 default:
1001 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1002 }
1003}
1004
1005/*
1006 * For text based NFSv2/v3 mounts, the mount protocol transport default
1007 * settings should depend upon the specified NFS transport.
1008 */
1009static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1010{
1011 nfs_validate_transport_protocol(mnt);
1012
1013 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1014 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1015 return;
1016 switch (mnt->nfs_server.protocol) {
1017 case XPRT_TRANSPORT_UDP:
1018 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1019 break;
1020 case XPRT_TRANSPORT_TCP:
1021 case XPRT_TRANSPORT_RDMA:
1022 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1023 }
1024}
1025
1026/*
1027 * Add 'flavor' to 'auth_info' if not already present.
1028 * Returns true if 'flavor' ends up in the list, false otherwise
1029 */
1030static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1031 rpc_authflavor_t flavor)
1032{
1033 unsigned int i;
1034 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1035
1036 /* make sure this flavor isn't already in the list */
1037 for (i = 0; i < auth_info->flavor_len; i++) {
1038 if (flavor == auth_info->flavors[i])
1039 return true;
1040 }
1041
1042 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1043 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1044 return false;
1045 }
1046
1047 auth_info->flavors[auth_info->flavor_len++] = flavor;
1048 return true;
1049}
1050
1051/*
1052 * Return true if 'match' is in auth_info or auth_info is empty.
1053 * Return false otherwise.
1054 */
1055bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1056 rpc_authflavor_t match)
1057{
1058 int i;
1059
1060 if (!auth_info->flavor_len)
1061 return true;
1062
1063 for (i = 0; i < auth_info->flavor_len; i++) {
1064 if (auth_info->flavors[i] == match)
1065 return true;
1066 }
1067 return false;
1068}
1069EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1070
1071/*
1072 * Parse the value of the 'sec=' option.
1073 */
1074static int nfs_parse_security_flavors(char *value,
1075 struct nfs_parsed_mount_data *mnt)
1076{
1077 substring_t args[MAX_OPT_ARGS];
1078 rpc_authflavor_t pseudoflavor;
1079 char *p;
1080
1081 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1082
1083 while ((p = strsep(&value, ":")) != NULL) {
1084 switch (match_token(p, nfs_secflavor_tokens, args)) {
1085 case Opt_sec_none:
1086 pseudoflavor = RPC_AUTH_NULL;
1087 break;
1088 case Opt_sec_sys:
1089 pseudoflavor = RPC_AUTH_UNIX;
1090 break;
1091 case Opt_sec_krb5:
1092 pseudoflavor = RPC_AUTH_GSS_KRB5;
1093 break;
1094 case Opt_sec_krb5i:
1095 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1096 break;
1097 case Opt_sec_krb5p:
1098 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1099 break;
1100 case Opt_sec_lkey:
1101 pseudoflavor = RPC_AUTH_GSS_LKEY;
1102 break;
1103 case Opt_sec_lkeyi:
1104 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1105 break;
1106 case Opt_sec_lkeyp:
1107 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1108 break;
1109 case Opt_sec_spkm:
1110 pseudoflavor = RPC_AUTH_GSS_SPKM;
1111 break;
1112 case Opt_sec_spkmi:
1113 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1114 break;
1115 case Opt_sec_spkmp:
1116 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1117 break;
1118 default:
1119 dfprintk(MOUNT,
1120 "NFS: sec= option '%s' not recognized\n", p);
1121 return 0;
1122 }
1123
1124 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1125 return 0;
1126 }
1127
1128 return 1;
1129}
1130
1131static int nfs_parse_version_string(char *string,
1132 struct nfs_parsed_mount_data *mnt,
1133 substring_t *args)
1134{
1135 mnt->flags &= ~NFS_MOUNT_VER3;
1136 switch (match_token(string, nfs_vers_tokens, args)) {
1137 case Opt_vers_2:
1138 mnt->version = 2;
1139 break;
1140 case Opt_vers_3:
1141 mnt->flags |= NFS_MOUNT_VER3;
1142 mnt->version = 3;
1143 break;
1144 case Opt_vers_4:
1145 /* Backward compatibility option. In future,
1146 * the mount program should always supply
1147 * a NFSv4 minor version number.
1148 */
1149 mnt->version = 4;
1150 break;
1151 case Opt_vers_4_0:
1152 mnt->version = 4;
1153 mnt->minorversion = 0;
1154 break;
1155 case Opt_vers_4_1:
1156 mnt->version = 4;
1157 mnt->minorversion = 1;
1158 break;
1159 case Opt_vers_4_2:
1160 mnt->version = 4;
1161 mnt->minorversion = 2;
1162 break;
1163 default:
1164 return 0;
1165 }
1166 return 1;
1167}
1168
1169static int nfs_get_option_str(substring_t args[], char **option)
1170{
1171 kfree(*option);
1172 *option = match_strdup(args);
1173 return !*option;
1174}
1175
1176static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1177{
1178 int rc;
1179 char *string;
1180
1181 string = match_strdup(args);
1182 if (string == NULL)
1183 return -ENOMEM;
1184 rc = kstrtoul(string, 10, option);
1185 kfree(string);
1186
1187 return rc;
1188}
1189
1190/*
1191 * Error-check and convert a string of mount options from user space into
1192 * a data structure. The whole mount string is processed; bad options are
1193 * skipped as they are encountered. If there were no errors, return 1;
1194 * otherwise return 0 (zero).
1195 */
1196static int nfs_parse_mount_options(char *raw,
1197 struct nfs_parsed_mount_data *mnt)
1198{
1199 char *p, *string, *secdata;
1200 int rc, sloppy = 0, invalid_option = 0;
1201 unsigned short protofamily = AF_UNSPEC;
1202 unsigned short mountfamily = AF_UNSPEC;
1203
1204 if (!raw) {
1205 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1206 return 1;
1207 }
1208 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1209
1210 secdata = alloc_secdata();
1211 if (!secdata)
1212 goto out_nomem;
1213
1214 rc = security_sb_copy_data(raw, secdata);
1215 if (rc)
1216 goto out_security_failure;
1217
1218 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1219 if (rc)
1220 goto out_security_failure;
1221
1222 free_secdata(secdata);
1223
1224 while ((p = strsep(&raw, ",")) != NULL) {
1225 substring_t args[MAX_OPT_ARGS];
1226 unsigned long option;
1227 int token;
1228
1229 if (!*p)
1230 continue;
1231
1232 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1233
1234 token = match_token(p, nfs_mount_option_tokens, args);
1235 switch (token) {
1236
1237 /*
1238 * boolean options: foo/nofoo
1239 */
1240 case Opt_soft:
1241 mnt->flags |= NFS_MOUNT_SOFT;
1242 break;
1243 case Opt_hard:
1244 mnt->flags &= ~NFS_MOUNT_SOFT;
1245 break;
1246 case Opt_posix:
1247 mnt->flags |= NFS_MOUNT_POSIX;
1248 break;
1249 case Opt_noposix:
1250 mnt->flags &= ~NFS_MOUNT_POSIX;
1251 break;
1252 case Opt_cto:
1253 mnt->flags &= ~NFS_MOUNT_NOCTO;
1254 break;
1255 case Opt_nocto:
1256 mnt->flags |= NFS_MOUNT_NOCTO;
1257 break;
1258 case Opt_ac:
1259 mnt->flags &= ~NFS_MOUNT_NOAC;
1260 break;
1261 case Opt_noac:
1262 mnt->flags |= NFS_MOUNT_NOAC;
1263 break;
1264 case Opt_lock:
1265 mnt->flags &= ~NFS_MOUNT_NONLM;
1266 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1267 NFS_MOUNT_LOCAL_FCNTL);
1268 break;
1269 case Opt_nolock:
1270 mnt->flags |= NFS_MOUNT_NONLM;
1271 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1272 NFS_MOUNT_LOCAL_FCNTL);
1273 break;
1274 case Opt_udp:
1275 mnt->flags &= ~NFS_MOUNT_TCP;
1276 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1277 break;
1278 case Opt_tcp:
1279 mnt->flags |= NFS_MOUNT_TCP;
1280 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1281 break;
1282 case Opt_rdma:
1283 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1284 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1285 xprt_load_transport(p);
1286 break;
1287 case Opt_acl:
1288 mnt->flags &= ~NFS_MOUNT_NOACL;
1289 break;
1290 case Opt_noacl:
1291 mnt->flags |= NFS_MOUNT_NOACL;
1292 break;
1293 case Opt_rdirplus:
1294 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1295 break;
1296 case Opt_nordirplus:
1297 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1298 break;
1299 case Opt_sharecache:
1300 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1301 break;
1302 case Opt_nosharecache:
1303 mnt->flags |= NFS_MOUNT_UNSHARED;
1304 break;
1305 case Opt_resvport:
1306 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1307 break;
1308 case Opt_noresvport:
1309 mnt->flags |= NFS_MOUNT_NORESVPORT;
1310 break;
1311 case Opt_fscache:
1312 mnt->options |= NFS_OPTION_FSCACHE;
1313 kfree(mnt->fscache_uniq);
1314 mnt->fscache_uniq = NULL;
1315 break;
1316 case Opt_nofscache:
1317 mnt->options &= ~NFS_OPTION_FSCACHE;
1318 kfree(mnt->fscache_uniq);
1319 mnt->fscache_uniq = NULL;
1320 break;
1321 case Opt_migration:
1322 mnt->options |= NFS_OPTION_MIGRATION;
1323 break;
1324 case Opt_nomigration:
1325 mnt->options &= NFS_OPTION_MIGRATION;
1326 break;
1327
1328 /*
1329 * options that take numeric values
1330 */
1331 case Opt_port:
1332 if (nfs_get_option_ul(args, &option) ||
1333 option > USHRT_MAX)
1334 goto out_invalid_value;
1335 mnt->nfs_server.port = option;
1336 break;
1337 case Opt_rsize:
1338 if (nfs_get_option_ul(args, &option))
1339 goto out_invalid_value;
1340 mnt->rsize = option;
1341 break;
1342 case Opt_wsize:
1343 if (nfs_get_option_ul(args, &option))
1344 goto out_invalid_value;
1345 mnt->wsize = option;
1346 break;
1347 case Opt_bsize:
1348 if (nfs_get_option_ul(args, &option))
1349 goto out_invalid_value;
1350 mnt->bsize = option;
1351 break;
1352 case Opt_timeo:
1353 if (nfs_get_option_ul(args, &option) || option == 0)
1354 goto out_invalid_value;
1355 mnt->timeo = option;
1356 break;
1357 case Opt_retrans:
1358 if (nfs_get_option_ul(args, &option) || option == 0)
1359 goto out_invalid_value;
1360 mnt->retrans = option;
1361 break;
1362 case Opt_acregmin:
1363 if (nfs_get_option_ul(args, &option))
1364 goto out_invalid_value;
1365 mnt->acregmin = option;
1366 break;
1367 case Opt_acregmax:
1368 if (nfs_get_option_ul(args, &option))
1369 goto out_invalid_value;
1370 mnt->acregmax = option;
1371 break;
1372 case Opt_acdirmin:
1373 if (nfs_get_option_ul(args, &option))
1374 goto out_invalid_value;
1375 mnt->acdirmin = option;
1376 break;
1377 case Opt_acdirmax:
1378 if (nfs_get_option_ul(args, &option))
1379 goto out_invalid_value;
1380 mnt->acdirmax = option;
1381 break;
1382 case Opt_actimeo:
1383 if (nfs_get_option_ul(args, &option))
1384 goto out_invalid_value;
1385 mnt->acregmin = mnt->acregmax =
1386 mnt->acdirmin = mnt->acdirmax = option;
1387 break;
1388 case Opt_namelen:
1389 if (nfs_get_option_ul(args, &option))
1390 goto out_invalid_value;
1391 mnt->namlen = option;
1392 break;
1393 case Opt_mountport:
1394 if (nfs_get_option_ul(args, &option) ||
1395 option > USHRT_MAX)
1396 goto out_invalid_value;
1397 mnt->mount_server.port = option;
1398 break;
1399 case Opt_mountvers:
1400 if (nfs_get_option_ul(args, &option) ||
1401 option < NFS_MNT_VERSION ||
1402 option > NFS_MNT3_VERSION)
1403 goto out_invalid_value;
1404 mnt->mount_server.version = option;
1405 break;
1406 case Opt_minorversion:
1407 if (nfs_get_option_ul(args, &option))
1408 goto out_invalid_value;
1409 if (option > NFS4_MAX_MINOR_VERSION)
1410 goto out_invalid_value;
1411 mnt->minorversion = option;
1412 break;
1413
1414 /*
1415 * options that take text values
1416 */
1417 case Opt_nfsvers:
1418 string = match_strdup(args);
1419 if (string == NULL)
1420 goto out_nomem;
1421 rc = nfs_parse_version_string(string, mnt, args);
1422 kfree(string);
1423 if (!rc)
1424 goto out_invalid_value;
1425 break;
1426 case Opt_sec:
1427 string = match_strdup(args);
1428 if (string == NULL)
1429 goto out_nomem;
1430 rc = nfs_parse_security_flavors(string, mnt);
1431 kfree(string);
1432 if (!rc) {
1433 dfprintk(MOUNT, "NFS: unrecognized "
1434 "security flavor\n");
1435 return 0;
1436 }
1437 break;
1438 case Opt_proto:
1439 string = match_strdup(args);
1440 if (string == NULL)
1441 goto out_nomem;
1442 token = match_token(string,
1443 nfs_xprt_protocol_tokens, args);
1444
1445 protofamily = AF_INET;
1446 switch (token) {
1447 case Opt_xprt_udp6:
1448 protofamily = AF_INET6;
1449 case Opt_xprt_udp:
1450 mnt->flags &= ~NFS_MOUNT_TCP;
1451 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1452 break;
1453 case Opt_xprt_tcp6:
1454 protofamily = AF_INET6;
1455 case Opt_xprt_tcp:
1456 mnt->flags |= NFS_MOUNT_TCP;
1457 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1458 break;
1459 case Opt_xprt_rdma:
1460 /* vector side protocols to TCP */
1461 mnt->flags |= NFS_MOUNT_TCP;
1462 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1463 xprt_load_transport(string);
1464 break;
1465 default:
1466 dfprintk(MOUNT, "NFS: unrecognized "
1467 "transport protocol\n");
1468 kfree(string);
1469 return 0;
1470 }
1471 kfree(string);
1472 break;
1473 case Opt_mountproto:
1474 string = match_strdup(args);
1475 if (string == NULL)
1476 goto out_nomem;
1477 token = match_token(string,
1478 nfs_xprt_protocol_tokens, args);
1479 kfree(string);
1480
1481 mountfamily = AF_INET;
1482 switch (token) {
1483 case Opt_xprt_udp6:
1484 mountfamily = AF_INET6;
1485 case Opt_xprt_udp:
1486 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1487 break;
1488 case Opt_xprt_tcp6:
1489 mountfamily = AF_INET6;
1490 case Opt_xprt_tcp:
1491 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1492 break;
1493 case Opt_xprt_rdma: /* not used for side protocols */
1494 default:
1495 dfprintk(MOUNT, "NFS: unrecognized "
1496 "transport protocol\n");
1497 return 0;
1498 }
1499 break;
1500 case Opt_addr:
1501 string = match_strdup(args);
1502 if (string == NULL)
1503 goto out_nomem;
1504 mnt->nfs_server.addrlen =
1505 rpc_pton(mnt->net, string, strlen(string),
1506 (struct sockaddr *)
1507 &mnt->nfs_server.address,
1508 sizeof(mnt->nfs_server.address));
1509 kfree(string);
1510 if (mnt->nfs_server.addrlen == 0)
1511 goto out_invalid_address;
1512 break;
1513 case Opt_clientaddr:
1514 if (nfs_get_option_str(args, &mnt->client_address))
1515 goto out_nomem;
1516 break;
1517 case Opt_mounthost:
1518 if (nfs_get_option_str(args,
1519 &mnt->mount_server.hostname))
1520 goto out_nomem;
1521 break;
1522 case Opt_mountaddr:
1523 string = match_strdup(args);
1524 if (string == NULL)
1525 goto out_nomem;
1526 mnt->mount_server.addrlen =
1527 rpc_pton(mnt->net, string, strlen(string),
1528 (struct sockaddr *)
1529 &mnt->mount_server.address,
1530 sizeof(mnt->mount_server.address));
1531 kfree(string);
1532 if (mnt->mount_server.addrlen == 0)
1533 goto out_invalid_address;
1534 break;
1535 case Opt_lookupcache:
1536 string = match_strdup(args);
1537 if (string == NULL)
1538 goto out_nomem;
1539 token = match_token(string,
1540 nfs_lookupcache_tokens, args);
1541 kfree(string);
1542 switch (token) {
1543 case Opt_lookupcache_all:
1544 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1545 break;
1546 case Opt_lookupcache_positive:
1547 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1548 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1549 break;
1550 case Opt_lookupcache_none:
1551 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1552 break;
1553 default:
1554 dfprintk(MOUNT, "NFS: invalid "
1555 "lookupcache argument\n");
1556 return 0;
1557 };
1558 break;
1559 case Opt_fscache_uniq:
1560 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1561 goto out_nomem;
1562 mnt->options |= NFS_OPTION_FSCACHE;
1563 break;
1564 case Opt_local_lock:
1565 string = match_strdup(args);
1566 if (string == NULL)
1567 goto out_nomem;
1568 token = match_token(string, nfs_local_lock_tokens,
1569 args);
1570 kfree(string);
1571 switch (token) {
1572 case Opt_local_lock_all:
1573 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1574 NFS_MOUNT_LOCAL_FCNTL);
1575 break;
1576 case Opt_local_lock_flock:
1577 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1578 break;
1579 case Opt_local_lock_posix:
1580 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1581 break;
1582 case Opt_local_lock_none:
1583 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1584 NFS_MOUNT_LOCAL_FCNTL);
1585 break;
1586 default:
1587 dfprintk(MOUNT, "NFS: invalid "
1588 "local_lock argument\n");
1589 return 0;
1590 };
1591 break;
1592
1593 /*
1594 * Special options
1595 */
1596 case Opt_sloppy:
1597 sloppy = 1;
1598 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1599 break;
1600 case Opt_userspace:
1601 case Opt_deprecated:
1602 dfprintk(MOUNT, "NFS: ignoring mount option "
1603 "'%s'\n", p);
1604 break;
1605
1606 default:
1607 invalid_option = 1;
1608 dfprintk(MOUNT, "NFS: unrecognized mount option "
1609 "'%s'\n", p);
1610 }
1611 }
1612
1613 if (!sloppy && invalid_option)
1614 return 0;
1615
1616 if (mnt->minorversion && mnt->version != 4)
1617 goto out_minorversion_mismatch;
1618
1619 if (mnt->options & NFS_OPTION_MIGRATION &&
1620 (mnt->version != 4 || mnt->minorversion != 0))
1621 goto out_migration_misuse;
1622
1623 /*
1624 * verify that any proto=/mountproto= options match the address
1625 * families in the addr=/mountaddr= options.
1626 */
1627 if (protofamily != AF_UNSPEC &&
1628 protofamily != mnt->nfs_server.address.ss_family)
1629 goto out_proto_mismatch;
1630
1631 if (mountfamily != AF_UNSPEC) {
1632 if (mnt->mount_server.addrlen) {
1633 if (mountfamily != mnt->mount_server.address.ss_family)
1634 goto out_mountproto_mismatch;
1635 } else {
1636 if (mountfamily != mnt->nfs_server.address.ss_family)
1637 goto out_mountproto_mismatch;
1638 }
1639 }
1640
1641 return 1;
1642
1643out_mountproto_mismatch:
1644 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1645 "option\n");
1646 return 0;
1647out_proto_mismatch:
1648 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1649 return 0;
1650out_invalid_address:
1651 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1652 return 0;
1653out_invalid_value:
1654 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1655 return 0;
1656out_minorversion_mismatch:
1657 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1658 "minorversion=%u\n", mnt->version, mnt->minorversion);
1659 return 0;
1660out_migration_misuse:
1661 printk(KERN_INFO
1662 "NFS: 'migration' not supported for this NFS version\n");
1663 return 0;
1664out_nomem:
1665 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1666 return 0;
1667out_security_failure:
1668 free_secdata(secdata);
1669 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1670 return 0;
1671}
1672
1673/*
1674 * Ensure that a specified authtype in args->auth_info is supported by
1675 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1676 * -EACCES if not.
1677 */
1678static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1679 rpc_authflavor_t *server_authlist, unsigned int count)
1680{
1681 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1682 unsigned int i;
1683
1684 /*
1685 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1686 * must be in the list returned by the server.
1687 *
1688 * AUTH_NULL has a special meaning when it's in the server list - it
1689 * means that the server will ignore the rpc creds, so any flavor
1690 * can be used.
1691 */
1692 for (i = 0; i < count; i++) {
1693 flavor = server_authlist[i];
1694
1695 if (nfs_auth_info_match(&args->auth_info, flavor) ||
1696 flavor == RPC_AUTH_NULL)
1697 goto out;
1698 }
1699
1700 dfprintk(MOUNT,
1701 "NFS: specified auth flavors not supported by server\n");
1702 return -EACCES;
1703
1704out:
1705 args->selected_flavor = flavor;
1706 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1707 return 0;
1708}
1709
1710/*
1711 * Use the remote server's MOUNT service to request the NFS file handle
1712 * corresponding to the provided path.
1713 */
1714static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1715 struct nfs_fh *root_fh,
1716 rpc_authflavor_t *server_authlist,
1717 unsigned int *server_authlist_len)
1718{
1719 struct nfs_mount_request request = {
1720 .sap = (struct sockaddr *)
1721 &args->mount_server.address,
1722 .dirpath = args->nfs_server.export_path,
1723 .protocol = args->mount_server.protocol,
1724 .fh = root_fh,
1725 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1726 .auth_flav_len = server_authlist_len,
1727 .auth_flavs = server_authlist,
1728 .net = args->net,
1729 };
1730 int status;
1731
1732 if (args->mount_server.version == 0) {
1733 switch (args->version) {
1734 default:
1735 args->mount_server.version = NFS_MNT3_VERSION;
1736 break;
1737 case 2:
1738 args->mount_server.version = NFS_MNT_VERSION;
1739 }
1740 }
1741 request.version = args->mount_server.version;
1742
1743 if (args->mount_server.hostname)
1744 request.hostname = args->mount_server.hostname;
1745 else
1746 request.hostname = args->nfs_server.hostname;
1747
1748 /*
1749 * Construct the mount server's address.
1750 */
1751 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1752 memcpy(request.sap, &args->nfs_server.address,
1753 args->nfs_server.addrlen);
1754 args->mount_server.addrlen = args->nfs_server.addrlen;
1755 }
1756 request.salen = args->mount_server.addrlen;
1757 nfs_set_port(request.sap, &args->mount_server.port, 0);
1758
1759 /*
1760 * Now ask the mount server to map our export path
1761 * to a file handle.
1762 */
1763 status = nfs_mount(&request);
1764 if (status != 0) {
1765 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1766 request.hostname, status);
1767 return status;
1768 }
1769
1770 return 0;
1771}
1772
1773static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1774 struct nfs_subversion *nfs_mod)
1775{
1776 int status;
1777 unsigned int i;
1778 bool tried_auth_unix = false;
1779 bool auth_null_in_list = false;
1780 struct nfs_server *server = ERR_PTR(-EACCES);
1781 struct nfs_parsed_mount_data *args = mount_info->parsed;
1782 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1783 unsigned int authlist_len = ARRAY_SIZE(authlist);
1784
1785 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1786 &authlist_len);
1787 if (status)
1788 return ERR_PTR(status);
1789
1790 /*
1791 * Was a sec= authflavor specified in the options? First, verify
1792 * whether the server supports it, and then just try to use it if so.
1793 */
1794 if (args->auth_info.flavor_len > 0) {
1795 status = nfs_verify_authflavors(args, authlist, authlist_len);
1796 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1797 args->selected_flavor);
1798 if (status)
1799 return ERR_PTR(status);
1800 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1801 }
1802
1803 /*
1804 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1805 * SHOULD prefer the flavor listed first. However, some servers list
1806 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1807 */
1808 for (i = 0; i < authlist_len; ++i) {
1809 rpc_authflavor_t flavor;
1810 struct rpcsec_gss_info info;
1811
1812 flavor = authlist[i];
1813 switch (flavor) {
1814 case RPC_AUTH_UNIX:
1815 tried_auth_unix = true;
1816 break;
1817 case RPC_AUTH_NULL:
1818 auth_null_in_list = true;
1819 continue;
1820 default:
1821 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1822 continue;
1823 /* Fallthrough */
1824 }
1825 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1826 args->selected_flavor = flavor;
1827 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1828 if (!IS_ERR(server))
1829 return server;
1830 }
1831
1832 /*
1833 * Nothing we tried so far worked. At this point, give up if we've
1834 * already tried AUTH_UNIX or if the server's list doesn't contain
1835 * AUTH_NULL
1836 */
1837 if (tried_auth_unix || !auth_null_in_list)
1838 return server;
1839
1840 /* Last chance! Try AUTH_UNIX */
1841 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1842 args->selected_flavor = RPC_AUTH_UNIX;
1843 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1844}
1845
1846struct dentry *nfs_try_mount(int flags, const char *dev_name,
1847 struct nfs_mount_info *mount_info,
1848 struct nfs_subversion *nfs_mod)
1849{
1850 struct nfs_server *server;
1851
1852 if (mount_info->parsed->need_mount)
1853 server = nfs_try_mount_request(mount_info, nfs_mod);
1854 else
1855 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1856
1857 if (IS_ERR(server))
1858 return ERR_CAST(server);
1859
1860 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1861}
1862EXPORT_SYMBOL_GPL(nfs_try_mount);
1863
1864/*
1865 * Split "dev_name" into "hostname:export_path".
1866 *
1867 * The leftmost colon demarks the split between the server's hostname
1868 * and the export path. If the hostname starts with a left square
1869 * bracket, then it may contain colons.
1870 *
1871 * Note: caller frees hostname and export path, even on error.
1872 */
1873static int nfs_parse_devname(const char *dev_name,
1874 char **hostname, size_t maxnamlen,
1875 char **export_path, size_t maxpathlen)
1876{
1877 size_t len;
1878 char *end;
1879
1880 /* Is the host name protected with square brakcets? */
1881 if (*dev_name == '[') {
1882 end = strchr(++dev_name, ']');
1883 if (end == NULL || end[1] != ':')
1884 goto out_bad_devname;
1885
1886 len = end - dev_name;
1887 end++;
1888 } else {
1889 char *comma;
1890
1891 end = strchr(dev_name, ':');
1892 if (end == NULL)
1893 goto out_bad_devname;
1894 len = end - dev_name;
1895
1896 /* kill possible hostname list: not supported */
1897 comma = strchr(dev_name, ',');
1898 if (comma != NULL && comma < end)
1899 *comma = 0;
1900 }
1901
1902 if (len > maxnamlen)
1903 goto out_hostname;
1904
1905 /* N.B. caller will free nfs_server.hostname in all cases */
1906 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1907 if (*hostname == NULL)
1908 goto out_nomem;
1909 len = strlen(++end);
1910 if (len > maxpathlen)
1911 goto out_path;
1912 *export_path = kstrndup(end, len, GFP_KERNEL);
1913 if (!*export_path)
1914 goto out_nomem;
1915
1916 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1917 return 0;
1918
1919out_bad_devname:
1920 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1921 return -EINVAL;
1922
1923out_nomem:
1924 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1925 return -ENOMEM;
1926
1927out_hostname:
1928 dfprintk(MOUNT, "NFS: server hostname too long\n");
1929 return -ENAMETOOLONG;
1930
1931out_path:
1932 dfprintk(MOUNT, "NFS: export pathname too long\n");
1933 return -ENAMETOOLONG;
1934}
1935
1936/*
1937 * Validate the NFS2/NFS3 mount data
1938 * - fills in the mount root filehandle
1939 *
1940 * For option strings, user space handles the following behaviors:
1941 *
1942 * + DNS: mapping server host name to IP address ("addr=" option)
1943 *
1944 * + failure mode: how to behave if a mount request can't be handled
1945 * immediately ("fg/bg" option)
1946 *
1947 * + retry: how often to retry a mount request ("retry=" option)
1948 *
1949 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1950 * mountproto=tcp after mountproto=udp, and so on
1951 */
1952static int nfs23_validate_mount_data(void *options,
1953 struct nfs_parsed_mount_data *args,
1954 struct nfs_fh *mntfh,
1955 const char *dev_name)
1956{
1957 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1958 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1959 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1960
1961 if (data == NULL)
1962 goto out_no_data;
1963
1964 args->version = NFS_DEFAULT_VERSION;
1965 switch (data->version) {
1966 case 1:
1967 data->namlen = 0;
1968 case 2:
1969 data->bsize = 0;
1970 case 3:
1971 if (data->flags & NFS_MOUNT_VER3)
1972 goto out_no_v3;
1973 data->root.size = NFS2_FHSIZE;
1974 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1975 /* Turn off security negotiation */
1976 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1977 case 4:
1978 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1979 goto out_no_sec;
1980 case 5:
1981 memset(data->context, 0, sizeof(data->context));
1982 case 6:
1983 if (data->flags & NFS_MOUNT_VER3) {
1984 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1985 goto out_invalid_fh;
1986 mntfh->size = data->root.size;
1987 args->version = 3;
1988 } else {
1989 mntfh->size = NFS2_FHSIZE;
1990 args->version = 2;
1991 }
1992
1993
1994 memcpy(mntfh->data, data->root.data, mntfh->size);
1995 if (mntfh->size < sizeof(mntfh->data))
1996 memset(mntfh->data + mntfh->size, 0,
1997 sizeof(mntfh->data) - mntfh->size);
1998
1999 /*
2000 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2001 * can deal with.
2002 */
2003 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2004 args->flags |= extra_flags;
2005 args->rsize = data->rsize;
2006 args->wsize = data->wsize;
2007 args->timeo = data->timeo;
2008 args->retrans = data->retrans;
2009 args->acregmin = data->acregmin;
2010 args->acregmax = data->acregmax;
2011 args->acdirmin = data->acdirmin;
2012 args->acdirmax = data->acdirmax;
2013 args->need_mount = false;
2014
2015 memcpy(sap, &data->addr, sizeof(data->addr));
2016 args->nfs_server.addrlen = sizeof(data->addr);
2017 args->nfs_server.port = ntohs(data->addr.sin_port);
2018 if (!nfs_verify_server_address(sap))
2019 goto out_no_address;
2020
2021 if (!(data->flags & NFS_MOUNT_TCP))
2022 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2023 /* N.B. caller will free nfs_server.hostname in all cases */
2024 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2025 args->namlen = data->namlen;
2026 args->bsize = data->bsize;
2027
2028 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2029 args->selected_flavor = data->pseudoflavor;
2030 else
2031 args->selected_flavor = RPC_AUTH_UNIX;
2032 if (!args->nfs_server.hostname)
2033 goto out_nomem;
2034
2035 if (!(data->flags & NFS_MOUNT_NONLM))
2036 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2037 NFS_MOUNT_LOCAL_FCNTL);
2038 else
2039 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2040 NFS_MOUNT_LOCAL_FCNTL);
2041 /*
2042 * The legacy version 6 binary mount data from userspace has a
2043 * field used only to transport selinux information into the
2044 * the kernel. To continue to support that functionality we
2045 * have a touch of selinux knowledge here in the NFS code. The
2046 * userspace code converted context=blah to just blah so we are
2047 * converting back to the full string selinux understands.
2048 */
2049 if (data->context[0]){
2050#ifdef CONFIG_SECURITY_SELINUX
2051 int rc;
2052 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2053 if (!opts_str)
2054 return -ENOMEM;
2055 strcpy(opts_str, "context=");
2056 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2057 strcat(opts_str, &data->context[0]);
2058 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2059 kfree(opts_str);
2060 if (rc)
2061 return rc;
2062#else
2063 return -EINVAL;
2064#endif
2065 }
2066
2067 break;
2068 default:
2069 return NFS_TEXT_DATA;
2070 }
2071
2072 return 0;
2073
2074out_no_data:
2075 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2076 return -EINVAL;
2077
2078out_no_v3:
2079 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2080 data->version);
2081 return -EINVAL;
2082
2083out_no_sec:
2084 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2085 return -EINVAL;
2086
2087out_nomem:
2088 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2089 return -ENOMEM;
2090
2091out_no_address:
2092 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2093 return -EINVAL;
2094
2095out_invalid_fh:
2096 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2097 return -EINVAL;
2098}
2099
2100#if IS_ENABLED(CONFIG_NFS_V4)
2101static int nfs_validate_mount_data(struct file_system_type *fs_type,
2102 void *options,
2103 struct nfs_parsed_mount_data *args,
2104 struct nfs_fh *mntfh,
2105 const char *dev_name)
2106{
2107 if (fs_type == &nfs_fs_type)
2108 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2109 return nfs4_validate_mount_data(options, args, dev_name);
2110}
2111#else
2112static int nfs_validate_mount_data(struct file_system_type *fs_type,
2113 void *options,
2114 struct nfs_parsed_mount_data *args,
2115 struct nfs_fh *mntfh,
2116 const char *dev_name)
2117{
2118 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2119}
2120#endif
2121
2122static int nfs_validate_text_mount_data(void *options,
2123 struct nfs_parsed_mount_data *args,
2124 const char *dev_name)
2125{
2126 int port = 0;
2127 int max_namelen = PAGE_SIZE;
2128 int max_pathlen = NFS_MAXPATHLEN;
2129 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2130
2131 if (nfs_parse_mount_options((char *)options, args) == 0)
2132 return -EINVAL;
2133
2134 if (!nfs_verify_server_address(sap))
2135 goto out_no_address;
2136
2137 if (args->version == 4) {
2138#if IS_ENABLED(CONFIG_NFS_V4)
2139 port = NFS_PORT;
2140 max_namelen = NFS4_MAXNAMLEN;
2141 max_pathlen = NFS4_MAXPATHLEN;
2142 nfs_validate_transport_protocol(args);
2143 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2144 goto out_invalid_transport_udp;
2145 nfs4_validate_mount_flags(args);
2146#else
2147 goto out_v4_not_compiled;
2148#endif /* CONFIG_NFS_V4 */
2149 } else
2150 nfs_set_mount_transport_protocol(args);
2151
2152 nfs_set_port(sap, &args->nfs_server.port, port);
2153
2154 return nfs_parse_devname(dev_name,
2155 &args->nfs_server.hostname,
2156 max_namelen,
2157 &args->nfs_server.export_path,
2158 max_pathlen);
2159
2160#if !IS_ENABLED(CONFIG_NFS_V4)
2161out_v4_not_compiled:
2162 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2163 return -EPROTONOSUPPORT;
2164#else
2165out_invalid_transport_udp:
2166 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2167 return -EINVAL;
2168#endif /* !CONFIG_NFS_V4 */
2169
2170out_no_address:
2171 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2172 return -EINVAL;
2173}
2174
2175#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2176 | NFS_MOUNT_SECURE \
2177 | NFS_MOUNT_TCP \
2178 | NFS_MOUNT_VER3 \
2179 | NFS_MOUNT_KERBEROS \
2180 | NFS_MOUNT_NONLM \
2181 | NFS_MOUNT_BROKEN_SUID \
2182 | NFS_MOUNT_STRICTLOCK \
2183 | NFS_MOUNT_LEGACY_INTERFACE)
2184
2185#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2186 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2187
2188static int
2189nfs_compare_remount_data(struct nfs_server *nfss,
2190 struct nfs_parsed_mount_data *data)
2191{
2192 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2193 data->rsize != nfss->rsize ||
2194 data->wsize != nfss->wsize ||
2195 data->version != nfss->nfs_client->rpc_ops->version ||
2196 data->minorversion != nfss->nfs_client->cl_minorversion ||
2197 data->retrans != nfss->client->cl_timeout->to_retries ||
2198 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2199 data->acregmin != nfss->acregmin / HZ ||
2200 data->acregmax != nfss->acregmax / HZ ||
2201 data->acdirmin != nfss->acdirmin / HZ ||
2202 data->acdirmax != nfss->acdirmax / HZ ||
2203 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2204 data->nfs_server.port != nfss->port ||
2205 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2206 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2207 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2208 return -EINVAL;
2209
2210 return 0;
2211}
2212
2213int
2214nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2215{
2216 int error;
2217 struct nfs_server *nfss = sb->s_fs_info;
2218 struct nfs_parsed_mount_data *data;
2219 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2220 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2221 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2222
2223 sync_filesystem(sb);
2224
2225 /*
2226 * Userspace mount programs that send binary options generally send
2227 * them populated with default values. We have no way to know which
2228 * ones were explicitly specified. Fall back to legacy behavior and
2229 * just return success.
2230 */
2231 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2232 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2233 options->version <= 6))))
2234 return 0;
2235
2236 data = kzalloc(sizeof(*data), GFP_KERNEL);
2237 if (data == NULL)
2238 return -ENOMEM;
2239
2240 /* fill out struct with values from existing mount */
2241 data->flags = nfss->flags;
2242 data->rsize = nfss->rsize;
2243 data->wsize = nfss->wsize;
2244 data->retrans = nfss->client->cl_timeout->to_retries;
2245 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2246 data->acregmin = nfss->acregmin / HZ;
2247 data->acregmax = nfss->acregmax / HZ;
2248 data->acdirmin = nfss->acdirmin / HZ;
2249 data->acdirmax = nfss->acdirmax / HZ;
2250 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2251 data->nfs_server.port = nfss->port;
2252 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2253 data->version = nfsvers;
2254 data->minorversion = nfss->nfs_client->cl_minorversion;
2255 data->net = current->nsproxy->net_ns;
2256 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2257 data->nfs_server.addrlen);
2258
2259 /* overwrite those values with any that were specified */
2260 error = -EINVAL;
2261 if (!nfs_parse_mount_options((char *)options, data))
2262 goto out;
2263
2264 /*
2265 * noac is a special case. It implies -o sync, but that's not
2266 * necessarily reflected in the mtab options. do_remount_sb
2267 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2268 * remount options, so we have to explicitly reset it.
2269 */
2270 if (data->flags & NFS_MOUNT_NOAC)
2271 *flags |= MS_SYNCHRONOUS;
2272
2273 /* compare new mount options with old ones */
2274 error = nfs_compare_remount_data(nfss, data);
2275out:
2276 kfree(data);
2277 return error;
2278}
2279EXPORT_SYMBOL_GPL(nfs_remount);
2280
2281/*
2282 * Initialise the common bits of the superblock
2283 */
2284inline void nfs_initialise_sb(struct super_block *sb)
2285{
2286 struct nfs_server *server = NFS_SB(sb);
2287
2288 sb->s_magic = NFS_SUPER_MAGIC;
2289
2290 /* We probably want something more informative here */
2291 snprintf(sb->s_id, sizeof(sb->s_id),
2292 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2293
2294 if (sb->s_blocksize == 0)
2295 sb->s_blocksize = nfs_block_bits(server->wsize,
2296 &sb->s_blocksize_bits);
2297
2298 sb->s_bdi = &server->backing_dev_info;
2299
2300 nfs_super_set_maxbytes(sb, server->maxfilesize);
2301}
2302
2303/*
2304 * Finish setting up an NFS2/3 superblock
2305 */
2306void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2307{
2308 struct nfs_parsed_mount_data *data = mount_info->parsed;
2309 struct nfs_server *server = NFS_SB(sb);
2310
2311 sb->s_blocksize_bits = 0;
2312 sb->s_blocksize = 0;
2313 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2314 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2315 if (data && data->bsize)
2316 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2317
2318 if (server->nfs_client->rpc_ops->version != 2) {
2319 /* The VFS shouldn't apply the umask to mode bits. We will do
2320 * so ourselves when necessary.
2321 */
2322 sb->s_flags |= MS_POSIXACL;
2323 sb->s_time_gran = 1;
2324 }
2325
2326 nfs_initialise_sb(sb);
2327}
2328EXPORT_SYMBOL_GPL(nfs_fill_super);
2329
2330/*
2331 * Finish setting up a cloned NFS2/3/4 superblock
2332 */
2333void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2334{
2335 const struct super_block *old_sb = mount_info->cloned->sb;
2336 struct nfs_server *server = NFS_SB(sb);
2337
2338 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2339 sb->s_blocksize = old_sb->s_blocksize;
2340 sb->s_maxbytes = old_sb->s_maxbytes;
2341 sb->s_xattr = old_sb->s_xattr;
2342 sb->s_op = old_sb->s_op;
2343 sb->s_time_gran = 1;
2344
2345 if (server->nfs_client->rpc_ops->version != 2) {
2346 /* The VFS shouldn't apply the umask to mode bits. We will do
2347 * so ourselves when necessary.
2348 */
2349 sb->s_flags |= MS_POSIXACL;
2350 }
2351
2352 nfs_initialise_sb(sb);
2353}
2354
2355static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2356{
2357 const struct nfs_server *a = s->s_fs_info;
2358 const struct rpc_clnt *clnt_a = a->client;
2359 const struct rpc_clnt *clnt_b = b->client;
2360
2361 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2362 goto Ebusy;
2363 if (a->nfs_client != b->nfs_client)
2364 goto Ebusy;
2365 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2366 goto Ebusy;
2367 if (a->wsize != b->wsize)
2368 goto Ebusy;
2369 if (a->rsize != b->rsize)
2370 goto Ebusy;
2371 if (a->acregmin != b->acregmin)
2372 goto Ebusy;
2373 if (a->acregmax != b->acregmax)
2374 goto Ebusy;
2375 if (a->acdirmin != b->acdirmin)
2376 goto Ebusy;
2377 if (a->acdirmax != b->acdirmax)
2378 goto Ebusy;
2379 if (b->auth_info.flavor_len > 0 &&
2380 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2381 goto Ebusy;
2382 return 1;
2383Ebusy:
2384 return 0;
2385}
2386
2387struct nfs_sb_mountdata {
2388 struct nfs_server *server;
2389 int mntflags;
2390};
2391
2392static int nfs_set_super(struct super_block *s, void *data)
2393{
2394 struct nfs_sb_mountdata *sb_mntdata = data;
2395 struct nfs_server *server = sb_mntdata->server;
2396 int ret;
2397
2398 s->s_flags = sb_mntdata->mntflags;
2399 s->s_fs_info = server;
2400 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2401 ret = set_anon_super(s, server);
2402 if (ret == 0)
2403 server->s_dev = s->s_dev;
2404 return ret;
2405}
2406
2407static int nfs_compare_super_address(struct nfs_server *server1,
2408 struct nfs_server *server2)
2409{
2410 struct sockaddr *sap1, *sap2;
2411
2412 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2413 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2414
2415 if (sap1->sa_family != sap2->sa_family)
2416 return 0;
2417
2418 switch (sap1->sa_family) {
2419 case AF_INET: {
2420 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2421 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2422 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2423 return 0;
2424 if (sin1->sin_port != sin2->sin_port)
2425 return 0;
2426 break;
2427 }
2428 case AF_INET6: {
2429 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2430 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2431 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2432 return 0;
2433 if (sin1->sin6_port != sin2->sin6_port)
2434 return 0;
2435 break;
2436 }
2437 default:
2438 return 0;
2439 }
2440
2441 return 1;
2442}
2443
2444static int nfs_compare_super(struct super_block *sb, void *data)
2445{
2446 struct nfs_sb_mountdata *sb_mntdata = data;
2447 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2448 int mntflags = sb_mntdata->mntflags;
2449
2450 if (!nfs_compare_super_address(old, server))
2451 return 0;
2452 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2453 if (old->flags & NFS_MOUNT_UNSHARED)
2454 return 0;
2455 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2456 return 0;
2457 return nfs_compare_mount_options(sb, server, mntflags);
2458}
2459
2460#ifdef CONFIG_NFS_FSCACHE
2461static void nfs_get_cache_cookie(struct super_block *sb,
2462 struct nfs_parsed_mount_data *parsed,
2463 struct nfs_clone_mount *cloned)
2464{
2465 struct nfs_server *nfss = NFS_SB(sb);
2466 char *uniq = NULL;
2467 int ulen = 0;
2468
2469 nfss->fscache_key = NULL;
2470 nfss->fscache = NULL;
2471
2472 if (parsed) {
2473 if (!(parsed->options & NFS_OPTION_FSCACHE))
2474 return;
2475 if (parsed->fscache_uniq) {
2476 uniq = parsed->fscache_uniq;
2477 ulen = strlen(parsed->fscache_uniq);
2478 }
2479 } else if (cloned) {
2480 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2481 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2482 return;
2483 if (mnt_s->fscache_key) {
2484 uniq = mnt_s->fscache_key->key.uniquifier;
2485 ulen = mnt_s->fscache_key->key.uniq_len;
2486 };
2487 } else
2488 return;
2489
2490 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2491}
2492#else
2493static void nfs_get_cache_cookie(struct super_block *sb,
2494 struct nfs_parsed_mount_data *parsed,
2495 struct nfs_clone_mount *cloned)
2496{
2497}
2498#endif
2499
2500static int nfs_bdi_register(struct nfs_server *server)
2501{
2502 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2503}
2504
2505int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2506 struct nfs_mount_info *mount_info)
2507{
2508 int error;
2509 unsigned long kflags = 0, kflags_out = 0;
2510 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2511 kflags |= SECURITY_LSM_NATIVE_LABELS;
2512
2513 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2514 kflags, &kflags_out);
2515 if (error)
2516 goto err;
2517
2518 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2519 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2520 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2521err:
2522 return error;
2523}
2524EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2525
2526int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2527 struct nfs_mount_info *mount_info)
2528{
2529 /* clone any lsm security options from the parent to the new sb */
2530 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2531 return -ESTALE;
2532 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2533}
2534EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2535
2536struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2537 int flags, const char *dev_name,
2538 struct nfs_mount_info *mount_info,
2539 struct nfs_subversion *nfs_mod)
2540{
2541 struct super_block *s;
2542 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2543 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2544 struct nfs_sb_mountdata sb_mntdata = {
2545 .mntflags = flags,
2546 .server = server,
2547 };
2548 int error;
2549
2550 if (server->flags & NFS_MOUNT_UNSHARED)
2551 compare_super = NULL;
2552
2553 /* -o noac implies -o sync */
2554 if (server->flags & NFS_MOUNT_NOAC)
2555 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2556
2557 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2558 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2559 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2560
2561 /* Get a superblock - note that we may end up sharing one that already exists */
2562 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2563 if (IS_ERR(s)) {
2564 mntroot = ERR_CAST(s);
2565 goto out_err_nosb;
2566 }
2567
2568 if (s->s_fs_info != server) {
2569 nfs_free_server(server);
2570 server = NULL;
2571 } else {
2572 error = nfs_bdi_register(server);
2573 if (error) {
2574 mntroot = ERR_PTR(error);
2575 goto error_splat_super;
2576 }
2577 server->super = s;
2578 }
2579
2580 if (!s->s_root) {
2581 /* initial superblock/root creation */
2582 mount_info->fill_super(s, mount_info);
2583 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2584 }
2585
2586 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2587 if (IS_ERR(mntroot))
2588 goto error_splat_super;
2589
2590 error = mount_info->set_security(s, mntroot, mount_info);
2591 if (error)
2592 goto error_splat_root;
2593
2594 s->s_flags |= MS_ACTIVE;
2595
2596out:
2597 return mntroot;
2598
2599out_err_nosb:
2600 nfs_free_server(server);
2601 goto out;
2602
2603error_splat_root:
2604 dput(mntroot);
2605 mntroot = ERR_PTR(error);
2606error_splat_super:
2607 deactivate_locked_super(s);
2608 goto out;
2609}
2610EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2611
2612struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2613 int flags, const char *dev_name, void *raw_data)
2614{
2615 struct nfs_mount_info mount_info = {
2616 .fill_super = nfs_fill_super,
2617 .set_security = nfs_set_sb_security,
2618 };
2619 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2620 struct nfs_subversion *nfs_mod;
2621 int error;
2622
2623 mount_info.parsed = nfs_alloc_parsed_mount_data();
2624 mount_info.mntfh = nfs_alloc_fhandle();
2625 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2626 goto out;
2627
2628 /* Validate the mount data */
2629 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2630 if (error == NFS_TEXT_DATA)
2631 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2632 if (error < 0) {
2633 mntroot = ERR_PTR(error);
2634 goto out;
2635 }
2636
2637 nfs_mod = get_nfs_version(mount_info.parsed->version);
2638 if (IS_ERR(nfs_mod)) {
2639 mntroot = ERR_CAST(nfs_mod);
2640 goto out;
2641 }
2642
2643 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2644
2645 put_nfs_version(nfs_mod);
2646out:
2647 nfs_free_parsed_mount_data(mount_info.parsed);
2648 nfs_free_fhandle(mount_info.mntfh);
2649 return mntroot;
2650}
2651EXPORT_SYMBOL_GPL(nfs_fs_mount);
2652
2653/*
2654 * Destroy an NFS2/3 superblock
2655 */
2656void nfs_kill_super(struct super_block *s)
2657{
2658 struct nfs_server *server = NFS_SB(s);
2659 dev_t dev = s->s_dev;
2660
2661 generic_shutdown_super(s);
2662
2663 nfs_fscache_release_super_cookie(s);
2664
2665 nfs_free_server(server);
2666 free_anon_bdev(dev);
2667}
2668EXPORT_SYMBOL_GPL(nfs_kill_super);
2669
2670/*
2671 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2672 */
2673static struct dentry *
2674nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2675 const char *dev_name, void *raw_data)
2676{
2677 struct nfs_clone_mount *data = raw_data;
2678 struct nfs_mount_info mount_info = {
2679 .fill_super = nfs_clone_super,
2680 .set_security = nfs_clone_sb_security,
2681 .cloned = data,
2682 };
2683 struct nfs_server *server;
2684 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2685 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2686
2687 dprintk("--> nfs_xdev_mount()\n");
2688
2689 mount_info.mntfh = mount_info.cloned->fh;
2690
2691 /* create a new volume representation */
2692 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2693
2694 if (IS_ERR(server))
2695 mntroot = ERR_CAST(server);
2696 else
2697 mntroot = nfs_fs_mount_common(server, flags,
2698 dev_name, &mount_info, nfs_mod);
2699
2700 dprintk("<-- nfs_xdev_mount() = %ld\n",
2701 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2702 return mntroot;
2703}
2704
2705#if IS_ENABLED(CONFIG_NFS_V4)
2706
2707static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2708{
2709 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2710 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2711}
2712
2713/*
2714 * Validate NFSv4 mount options
2715 */
2716static int nfs4_validate_mount_data(void *options,
2717 struct nfs_parsed_mount_data *args,
2718 const char *dev_name)
2719{
2720 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2721 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2722 char *c;
2723
2724 if (data == NULL)
2725 goto out_no_data;
2726
2727 args->version = 4;
2728
2729 switch (data->version) {
2730 case 1:
2731 if (data->host_addrlen > sizeof(args->nfs_server.address))
2732 goto out_no_address;
2733 if (data->host_addrlen == 0)
2734 goto out_no_address;
2735 args->nfs_server.addrlen = data->host_addrlen;
2736 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2737 return -EFAULT;
2738 if (!nfs_verify_server_address(sap))
2739 goto out_no_address;
2740 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2741
2742 if (data->auth_flavourlen) {
2743 rpc_authflavor_t pseudoflavor;
2744 if (data->auth_flavourlen > 1)
2745 goto out_inval_auth;
2746 if (copy_from_user(&pseudoflavor,
2747 data->auth_flavours,
2748 sizeof(pseudoflavor)))
2749 return -EFAULT;
2750 args->selected_flavor = pseudoflavor;
2751 } else
2752 args->selected_flavor = RPC_AUTH_UNIX;
2753
2754 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2755 if (IS_ERR(c))
2756 return PTR_ERR(c);
2757 args->nfs_server.hostname = c;
2758
2759 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2760 if (IS_ERR(c))
2761 return PTR_ERR(c);
2762 args->nfs_server.export_path = c;
2763 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2764
2765 c = strndup_user(data->client_addr.data, 16);
2766 if (IS_ERR(c))
2767 return PTR_ERR(c);
2768 args->client_address = c;
2769
2770 /*
2771 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2772 * can deal with.
2773 */
2774
2775 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2776 args->rsize = data->rsize;
2777 args->wsize = data->wsize;
2778 args->timeo = data->timeo;
2779 args->retrans = data->retrans;
2780 args->acregmin = data->acregmin;
2781 args->acregmax = data->acregmax;
2782 args->acdirmin = data->acdirmin;
2783 args->acdirmax = data->acdirmax;
2784 args->nfs_server.protocol = data->proto;
2785 nfs_validate_transport_protocol(args);
2786 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2787 goto out_invalid_transport_udp;
2788
2789 break;
2790 default:
2791 return NFS_TEXT_DATA;
2792 }
2793
2794 return 0;
2795
2796out_no_data:
2797 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2798 return -EINVAL;
2799
2800out_inval_auth:
2801 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2802 data->auth_flavourlen);
2803 return -EINVAL;
2804
2805out_no_address:
2806 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2807 return -EINVAL;
2808
2809out_invalid_transport_udp:
2810 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2811 return -EINVAL;
2812}
2813
2814/*
2815 * NFS v4 module parameters need to stay in the
2816 * NFS client for backwards compatibility
2817 */
2818unsigned int nfs_callback_set_tcpport;
2819/* Default cache timeout is 10 minutes */
2820unsigned int nfs_idmap_cache_timeout = 600;
2821/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2822bool nfs4_disable_idmapping = true;
2823unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2824unsigned short send_implementation_id = 1;
2825char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2826bool recover_lost_locks = false;
2827
2828EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2829EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2830EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2831EXPORT_SYMBOL_GPL(max_session_slots);
2832EXPORT_SYMBOL_GPL(send_implementation_id);
2833EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2834EXPORT_SYMBOL_GPL(recover_lost_locks);
2835
2836#define NFS_CALLBACK_MAXPORTNR (65535U)
2837
2838static int param_set_portnr(const char *val, const struct kernel_param *kp)
2839{
2840 unsigned long num;
2841 int ret;
2842
2843 if (!val)
2844 return -EINVAL;
2845 ret = kstrtoul(val, 0, &num);
2846 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2847 return -EINVAL;
2848 *((unsigned int *)kp->arg) = num;
2849 return 0;
2850}
2851static const struct kernel_param_ops param_ops_portnr = {
2852 .set = param_set_portnr,
2853 .get = param_get_uint,
2854};
2855#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2856
2857module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2858module_param(nfs_idmap_cache_timeout, int, 0644);
2859module_param(nfs4_disable_idmapping, bool, 0644);
2860module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2861 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2862MODULE_PARM_DESC(nfs4_disable_idmapping,
2863 "Turn off NFSv4 idmapping when using 'sec=sys'");
2864module_param(max_session_slots, ushort, 0644);
2865MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2866 "requests the client will negotiate");
2867module_param(send_implementation_id, ushort, 0644);
2868MODULE_PARM_DESC(send_implementation_id,
2869 "Send implementation ID with NFSv4.1 exchange_id");
2870MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2871
2872module_param(recover_lost_locks, bool, 0644);
2873MODULE_PARM_DESC(recover_lost_locks,
2874 "If the server reports that a lock might be lost, "
2875 "try to recover it risking data corruption.");
2876
2877
2878#endif /* CONFIG_NFS_V4 */