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NFS: Split out the NFS v4 filesystem types
[mirror_ubuntu-bionic-kernel.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 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 *
54ceac45
DH		 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())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.h>
2446ab60 56#include <linux/rcupdate.h>
f7b422b1 57
f7b422b1
DH		 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"
08734048 65#include "fscache.h"
ae50c0b5 66#include "pnfs.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
b72e4f42 69#define NFS_TEXT_DATA 1
f7b422b1 70
1e657bd5
PZ		 71#ifdef CONFIG_NFS_V3
72#define NFS_DEFAULT_VERSION 3
73#else
74#define NFS_DEFAULT_VERSION 2
75#endif
76
bf0fd768
CL		 77enum {
78 /* Mount options that take no arguments */
79 Opt_soft, Opt_hard,
bf0fd768
CL		 80 Opt_posix, Opt_noposix,
81 Opt_cto, Opt_nocto,
82 Opt_ac, Opt_noac,
83 Opt_lock, Opt_nolock,
2cf7ff7a 84 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
75180df2 87 Opt_sharecache, Opt_nosharecache,
d740351b 88 Opt_resvport, Opt_noresvport,
b797cac7 89 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
e887cbcf 100 Opt_mountvers,
3fd5be9e 101 Opt_minorversion,
bf0fd768
CL		 102
103 /* Mount options that take string arguments */
0d71b058 104 Opt_nfsvers,
33832034 105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 107 Opt_lookupcache,
b797cac7 108 Opt_fscache_uniq,
5eebde23 109 Opt_local_lock,
bf0fd768 110
f45663ce
CL		 111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 113
114 Opt_err
115};
116
a447c093 117static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
ecbb3845
CL		 120 { Opt_userspace, "retry=%s" },
121
f45663ce
CL		 122 { Opt_sloppy, "sloppy" },
123
bf0fd768
CL		 124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
d33e4dfe
CL		 126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
bf0fd768
CL		 128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
bf0fd768
CL		 136 { Opt_udp, "udp" },
137 { Opt_tcp, "tcp" },
2cf7ff7a 138 { Opt_rdma, "rdma" },
bf0fd768
CL		 139 { Opt_acl, "acl" },
140 { Opt_noacl, "noacl" },
141 { Opt_rdirplus, "rdirplus" },
142 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 143 { Opt_sharecache, "sharecache" },
144 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 145 { Opt_resvport, "resvport" },
146 { Opt_noresvport, "noresvport" },
b797cac7 147 { Opt_fscache, "fsc" },
b797cac7 148 { Opt_nofscache, "nofsc" },
bf0fd768 149
a5a16bae
CL		 150 { Opt_port, "port=%s" },
151 { Opt_rsize, "rsize=%s" },
152 { Opt_wsize, "wsize=%s" },
153 { Opt_bsize, "bsize=%s" },
154 { Opt_timeo, "timeo=%s" },
155 { Opt_retrans, "retrans=%s" },
156 { Opt_acregmin, "acregmin=%s" },
157 { Opt_acregmax, "acregmax=%s" },
158 { Opt_acdirmin, "acdirmin=%s" },
159 { Opt_acdirmax, "acdirmax=%s" },
160 { Opt_actimeo, "actimeo=%s" },
161 { Opt_namelen, "namlen=%s" },
162 { Opt_mountport, "mountport=%s" },
163 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 164 { Opt_minorversion, "minorversion=%s" },
165
a5a16bae
CL		 166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 168
169 { Opt_sec, "sec=%s" },
170 { Opt_proto, "proto=%s" },
171 { Opt_mountproto, "mountproto=%s" },
172 { Opt_addr, "addr=%s" },
173 { Opt_clientaddr, "clientaddr=%s" },
33832034 174 { Opt_mounthost, "mounthost=%s" },
0ac83779 175 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 176
7973c1f1 177 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 178 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 179 { Opt_local_lock, "local_lock=%s" },
7973c1f1 180
3862279a
TM		 181 /* The following needs to be listed after all other options */
182 { Opt_nfsvers, "v%s" },
183
bf0fd768
CL		 184 { Opt_err, NULL }
185};
186
187enum {
ee671b01 188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 189
190 Opt_xprt_err
191};
192
a447c093 193static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 194 { Opt_xprt_udp, "udp" },
ee671b01 195 { Opt_xprt_udp6, "udp6" },
bf0fd768 196 { Opt_xprt_tcp, "tcp" },
ee671b01 197 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 198 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 199
200 { Opt_xprt_err, NULL }
201};
202
203enum {
204 Opt_sec_none, Opt_sec_sys,
205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
208
209 Opt_sec_err
210};
211
a447c093 212static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 213 { Opt_sec_none, "none" },
214 { Opt_sec_none, "null" },
215 { Opt_sec_sys, "sys" },
216
217 { Opt_sec_krb5, "krb5" },
218 { Opt_sec_krb5i, "krb5i" },
219 { Opt_sec_krb5p, "krb5p" },
220
221 { Opt_sec_lkey, "lkey" },
222 { Opt_sec_lkeyi, "lkeyi" },
223 { Opt_sec_lkeyp, "lkeyp" },
224
8d042218
OK		 225 { Opt_sec_spkm, "spkm3" },
226 { Opt_sec_spkmi, "spkm3i" },
227 { Opt_sec_spkmp, "spkm3p" },
228
bf0fd768
CL		 229 { Opt_sec_err, NULL }
230};
231
7973c1f1
TM		 232enum {
233 Opt_lookupcache_all, Opt_lookupcache_positive,
234 Opt_lookupcache_none,
235
236 Opt_lookupcache_err
237};
238
239static match_table_t nfs_lookupcache_tokens = {
240 { Opt_lookupcache_all, "all" },
241 { Opt_lookupcache_positive, "pos" },
242 { Opt_lookupcache_positive, "positive" },
243 { Opt_lookupcache_none, "none" },
244
245 { Opt_lookupcache_err, NULL }
246};
247
5eebde23
SJ		 248enum {
249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
250 Opt_local_lock_none,
251
252 Opt_local_lock_err
253};
254
255static match_table_t nfs_local_lock_tokens = {
256 { Opt_local_lock_all, "all" },
257 { Opt_local_lock_flock, "flock" },
258 { Opt_local_lock_posix, "posix" },
259 { Opt_local_lock_none, "none" },
260
261 { Opt_local_lock_err, NULL }
262};
263
0d71b058
TM		 264enum {
265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
266 Opt_vers_4_1,
267
268 Opt_vers_err
269};
270
271static match_table_t nfs_vers_tokens = {
272 { Opt_vers_2, "2" },
273 { Opt_vers_3, "3" },
274 { Opt_vers_4, "4" },
275 { Opt_vers_4_0, "4.0" },
276 { Opt_vers_4_1, "4.1" },
277
278 { Opt_vers_err, NULL }
279};
bf0fd768 280
31f43471
AV		 281static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
282 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 283
284static struct file_system_type nfs_fs_type = {
285 .owner = THIS_MODULE,
286 .name = "nfs",
01194981 287 .mount = nfs_fs_mount,
f7b422b1 288 .kill_sb = nfs_kill_super,
349457cc 289 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 290};
291
54ceac45 292struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 293 .owner = THIS_MODULE,
294 .name = "nfs",
31f43471 295 .mount = nfs_xdev_mount,
f7b422b1 296 .kill_sb = nfs_kill_super,
349457cc 297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 298};
299
ee9b6d61 300static const struct super_operations nfs_sops = {
f7b422b1
DH		 301 .alloc_inode = nfs_alloc_inode,
302 .destroy_inode = nfs_destroy_inode,
303 .write_inode = nfs_write_inode,
387c149b 304 .put_super = nfs_put_super,
f7b422b1 305 .statfs = nfs_statfs,
b57922d9 306 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 307 .umount_begin = nfs_umount_begin,
308 .show_options = nfs_show_options,
c7f404b4
AV		 309 .show_devname = nfs_show_devname,
310 .show_path = nfs_show_path,
f7b422b1 311 .show_stats = nfs_show_stats,
48b605f8 312 .remount_fs = nfs_remount,
f7b422b1
DH		 313};
314
315#ifdef CONFIG_NFS_V4
b72e4f42 316static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
d72c727c
BS		 317static int nfs4_validate_mount_data(void *options,
318 struct nfs_parsed_mount_data *args, const char *dev_name);
f7b422b1
DH		 319#endif
320
8e1f936b
RR		 321static struct shrinker acl_shrinker = {
322 .shrink = nfs_access_cache_shrinker,
323 .seeks = DEFAULT_SEEKS,
324};
979df72e 325
f7b422b1
DH		 326/*
327 * Register the NFS filesystems
328 */
329int __init register_nfs_fs(void)
330{
331 int ret;
332
333 ret = register_filesystem(&nfs_fs_type);
334 if (ret < 0)
335 goto error_0;
336
f7b422b1
DH		 337 ret = nfs_register_sysctl();
338 if (ret < 0)
339 goto error_1;
8e1f936b 340 register_shrinker(&acl_shrinker);
f7b422b1
DH		 341 return 0;
342
f7b422b1
DH		 343error_1:
344 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 345error_0:
346 return ret;
347}
348
349/*
350 * Unregister the NFS filesystems
351 */
352void __exit unregister_nfs_fs(void)
353{
8e1f936b 354 unregister_shrinker(&acl_shrinker);
49af7ee1 355 nfs_unregister_sysctl();
f7b422b1
DH		 356 unregister_filesystem(&nfs_fs_type);
357}
358
1daef0a8 359void nfs_sb_active(struct super_block *sb)
ef818a28 360{
1daef0a8 361 struct nfs_server *server = NFS_SB(sb);
ef818a28 362
1daef0a8
TM		 363 if (atomic_inc_return(&server->active) == 1)
364 atomic_inc(&sb->s_active);
ef818a28
SD		 365}
366
1daef0a8 367void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 368{
369 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 370
371 if (atomic_dec_and_test(&server->active))
372 deactivate_super(sb);
ef818a28
SD		 373}
374
f7b422b1
DH		 375/*
376 * Deliver file system statistics to userspace
377 */
fbdefd64 378int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 379{
0c7d90cf 380 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 381 unsigned char blockbits;
382 unsigned long blockres;
0c7d90cf 383 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 384 struct nfs_fsstat res;
385 int error = -ENOMEM;
386
387 res.fattr = nfs_alloc_fattr();
388 if (res.fattr == NULL)
389 goto out_err;
f7b422b1 390
8fa5c000 391 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 392 if (unlikely(error == -ESTALE)) {
393 struct dentry *pd_dentry;
394
395 pd_dentry = dget_parent(dentry);
396 if (pd_dentry != NULL) {
397 nfs_zap_caches(pd_dentry->d_inode);
398 dput(pd_dentry);
399 }
400 }
ca7e9a0d 401 nfs_free_fattr(res.fattr);
f7b422b1
DH		 402 if (error < 0)
403 goto out_err;
ca7e9a0d 404
1a0ba9ae 405 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 406
407 /*
408 * Current versions of glibc do not correctly handle the
409 * case where f_frsize != f_bsize. Eventually we want to
410 * report the value of wtmult in this field.
411 */
0c7d90cf 412 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 413
414 /*
415 * On most *nix systems, f_blocks, f_bfree, and f_bavail
416 * are reported in units of f_frsize. Linux hasn't had
417 * an f_frsize field in its statfs struct until recently,
418 * thus historically Linux's sys_statfs reports these
419 * fields in units of f_bsize.
420 */
0c7d90cf
DH		 421 buf->f_bsize = dentry->d_sb->s_blocksize;
422 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 423 blockres = (1 << blockbits) - 1;
424 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
425 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
426 buf->f_bavail = (res.abytes + blockres) >> blockbits;
427
428 buf->f_files = res.tfiles;
429 buf->f_ffree = res.afiles;
430
431 buf->f_namelen = server->namelen;
1a0ba9ae 432
f7b422b1
DH		 433 return 0;
434
435 out_err:
3110ff80 436 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 437 return error;
f7b422b1
DH		 438}
439
7d4e2747
DH		 440/*
441 * Map the security flavour number to a name
442 */
81039f1f
TM		 443static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
444{
7d4e2747 445 static const struct {
81039f1f
TM		 446 rpc_authflavor_t flavour;
447 const char *str;
448 } sec_flavours[] = {
449 { RPC_AUTH_NULL, "null" },
450 { RPC_AUTH_UNIX, "sys" },
451 { RPC_AUTH_GSS_KRB5, "krb5" },
452 { RPC_AUTH_GSS_KRB5I, "krb5i" },
453 { RPC_AUTH_GSS_KRB5P, "krb5p" },
454 { RPC_AUTH_GSS_LKEY, "lkey" },
455 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
456 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
457 { RPC_AUTH_GSS_SPKM, "spkm" },
458 { RPC_AUTH_GSS_SPKMI, "spkmi" },
459 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 460 { UINT_MAX, "unknown" }
81039f1f
TM		 461 };
462 int i;
463
4d81cd16 464 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 465 if (sec_flavours[i].flavour == flavour)
466 break;
467 }
468 return sec_flavours[i].str;
469}
470
ee671b01
JL		 471static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
472 int showdefaults)
473{
474 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
475
476 seq_printf(m, ",mountproto=");
477 switch (sap->sa_family) {
478 case AF_INET:
479 switch (nfss->mountd_protocol) {
480 case IPPROTO_UDP:
481 seq_printf(m, RPCBIND_NETID_UDP);
482 break;
483 case IPPROTO_TCP:
484 seq_printf(m, RPCBIND_NETID_TCP);
485 break;
486 default:
487 if (showdefaults)
488 seq_printf(m, "auto");
489 }
490 break;
491 case AF_INET6:
492 switch (nfss->mountd_protocol) {
493 case IPPROTO_UDP:
494 seq_printf(m, RPCBIND_NETID_UDP6);
495 break;
496 case IPPROTO_TCP:
497 seq_printf(m, RPCBIND_NETID_TCP6);
498 break;
499 default:
500 if (showdefaults)
501 seq_printf(m, "auto");
502 }
503 break;
504 default:
505 if (showdefaults)
506 seq_printf(m, "auto");
507 }
508}
509
82d101d5
CL		 510static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
511 int showdefaults)
512{
513 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
514
d5eff1a3
BS		 515 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
516 return;
517
82d101d5
CL		 518 switch (sap->sa_family) {
519 case AF_INET: {
520 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 521 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 522 break;
523 }
524 case AF_INET6: {
525 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 526 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 527 break;
528 }
529 default:
530 if (showdefaults)
531 seq_printf(m, ",mountaddr=unspecified");
532 }
533
534 if (nfss->mountd_version || showdefaults)
535 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 536 if ((nfss->mountd_port &&
537 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
538 showdefaults)
82d101d5
CL		 539 seq_printf(m, ",mountport=%u", nfss->mountd_port);
540
ee671b01 541 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 542}
543
0be8189f
TM		 544#ifdef CONFIG_NFS_V4
545static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
546 int showdefaults)
547{
548 struct nfs_client *clp = nfss->nfs_client;
549
550 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 551}
552#else
553static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
554 int showdefaults)
555{
556}
557#endif
558
7bbceb6f
TM		 559static void nfs_show_nfs_version(struct seq_file *m,
560 unsigned int version,
561 unsigned int minorversion)
562{
563 seq_printf(m, ",vers=%u", version);
564 if (version == 4)
565 seq_printf(m, ".%u", minorversion);
566}
567
f7b422b1
DH		 568/*
569 * Describe the mount options in force on this server representation
570 */
82d101d5
CL		 571static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
572 int showdefaults)
f7b422b1 573{
509de811 574 static const struct proc_nfs_info {
f7b422b1 575 int flag;
509de811
DH		 576 const char *str;
577 const char *nostr;
f7b422b1
DH		 578 } nfs_info[] = {
579 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 580 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 581 { NFS_MOUNT_NOCTO, ",nocto", "" },
582 { NFS_MOUNT_NOAC, ",noac", "" },
583 { NFS_MOUNT_NONLM, ",nolock", "" },
584 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 585 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 586 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
587 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 588 { 0, NULL, NULL }
589 };
509de811 590 const struct proc_nfs_info *nfs_infop;
8fa5c000 591 struct nfs_client *clp = nfss->nfs_client;
82d101d5 592 u32 version = clp->rpc_ops->version;
7c563cc9 593 int local_flock, local_fcntl;
f7b422b1 594
7bbceb6f 595 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 596 seq_printf(m, ",rsize=%u", nfss->rsize);
597 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 598 if (nfss->bsize != 0)
599 seq_printf(m, ",bsize=%u", nfss->bsize);
600 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 601 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 602 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 603 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 604 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 605 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 606 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 607 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 608 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 609 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
610 if (nfss->flags & nfs_infop->flag)
611 seq_puts(m, nfs_infop->str);
612 else
613 seq_puts(m, nfs_infop->nostr);
614 }
2446ab60 615 rcu_read_lock();
56928edd 616 seq_printf(m, ",proto=%s",
ee671b01 617 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 618 rcu_read_unlock();
82d101d5
CL		 619 if (version == 4) {
620 if (nfss->port != NFS_PORT)
621 seq_printf(m, ",port=%u", nfss->port);
622 } else
623 if (nfss->port)
624 seq_printf(m, ",port=%u", nfss->port);
625
33170233
TM		 626 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
627 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 628 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 629
630 if (version != 4)
631 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 632 else
633 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 634
b797cac7
DH		 635 if (nfss->options & NFS_OPTION_FSCACHE)
636 seq_printf(m, ",fsc");
9b00c643
PL		 637
638 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
639 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
640 seq_printf(m, ",lookupcache=none");
641 else
642 seq_printf(m, ",lookupcache=pos");
643 }
7c563cc9
SJ		 644
645 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
646 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
647
648 if (!local_flock && !local_fcntl)
649 seq_printf(m, ",local_lock=none");
650 else if (local_flock && local_fcntl)
651 seq_printf(m, ",local_lock=all");
652 else if (local_flock)
653 seq_printf(m, ",local_lock=flock");
654 else
655 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 656}
657
658/*
659 * Describe the mount options on this VFS mountpoint
660 */
fbdefd64 661int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 662{
34c80b1d 663 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 664
665 nfs_show_mount_options(m, nfss, 0);
666
2446ab60 667 rcu_read_lock();
5d8515ca
CL		 668 seq_printf(m, ",addr=%s",
669 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
670 RPC_DISPLAY_ADDR));
2446ab60 671 rcu_read_unlock();
f7b422b1
DH		 672
673 return 0;
674}
45402c38
HS		 675
676#ifdef CONFIG_NFS_V4
ae50c0b5 677#ifdef CONFIG_NFS_V4_1
45402c38 678static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 679{
680 if (nfs4_has_session(server->nfs_client))
681 seq_printf(m, ",sessions");
682}
683#else
45402c38
HS		 684static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
685#endif
ae50c0b5
BF		 686#endif
687
688#ifdef CONFIG_NFS_V4_1
45402c38 689static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 690{
691 seq_printf(m, ",pnfs=");
692 if (server->pnfs_curr_ld)
693 seq_printf(m, "%s", server->pnfs_curr_ld->name);
694 else
695 seq_printf(m, "not configured");
696}
7e03b7cc
TM		 697
698static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
699{
59155546
CL		 700 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
701 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 702 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
703 "date='%llu,%u'",
704 impl_id->name, impl_id->domain,
705 impl_id->date.seconds, impl_id->date.nseconds);
706 }
707}
45402c38 708#else
7e03b7cc
TM		 709#ifdef CONFIG_NFS_V4
710static void show_pnfs(struct seq_file *m, struct nfs_server *server)
711{
712}
45402c38 713#endif
7e03b7cc
TM		 714static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
715{
716}
45402c38 717#endif
f7b422b1 718
fbdefd64 719int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 720{
721 char *page = (char *) __get_free_page(GFP_KERNEL);
722 char *devname, *dummy;
723 int err = 0;
724 if (!page)
725 return -ENOMEM;
d861c630 726 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 727 if (IS_ERR(devname))
728 err = PTR_ERR(devname);
729 else
730 seq_escape(m, devname, " \t\n\\");
731 free_page((unsigned long)page);
732 return err;
733}
734
fbdefd64 735int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 736{
737 seq_puts(m, "/");
738 return 0;
739}
740
f7b422b1
DH		 741/*
742 * Present statistical information for this VFS mountpoint
743 */
fbdefd64 744int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 745{
746 int i, cpu;
64132379 747 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 748 struct rpc_auth *auth = nfss->client->cl_auth;
749 struct nfs_iostats totals = { };
750
751 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
752
753 /*
754 * Display all mount option settings
755 */
756 seq_printf(m, "\n\topts:\t");
64132379
AV		 757 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
758 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
759 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
760 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 761 nfs_show_mount_options(m, nfss, 1);
762
763 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
764
7e03b7cc 765 show_implementation_id(m, nfss);
7d2ed9ac 766
f7b422b1
DH		 767 seq_printf(m, "\n\tcaps:\t");
768 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 769 seq_printf(m, ",wtmult=%u", nfss->wtmult);
770 seq_printf(m, ",dtsize=%u", nfss->dtsize);
771 seq_printf(m, ",bsize=%u", nfss->bsize);
772 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 773
774#ifdef CONFIG_NFS_V4
40c55319 775 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 776 seq_printf(m, "\n\tnfsv4:\t");
777 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
778 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
779 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 780 show_sessions(m, nfss);
781 show_pnfs(m, nfss);
f7b422b1
DH		 782 }
783#endif
784
785 /*
786 * Display security flavor in effect for this mount
787 */
2d767432 788 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 789 if (auth->au_flavor)
2d767432 790 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 791
792 /*
793 * Display superblock I/O counters
794 */
795 for_each_possible_cpu(cpu) {
796 struct nfs_iostats *stats;
797
798 preempt_disable();
799 stats = per_cpu_ptr(nfss->io_stats, cpu);
800
801 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
802 totals.events[i] += stats->events[i];
803 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
804 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 805#ifdef CONFIG_NFS_FSCACHE
806 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
807 totals.fscache[i] += stats->fscache[i];
808#endif
f7b422b1
DH		 809
810 preempt_enable();
811 }
812
813 seq_printf(m, "\n\tevents:\t");
814 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
815 seq_printf(m, "%lu ", totals.events[i]);
816 seq_printf(m, "\n\tbytes:\t");
817 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
818 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 819#ifdef CONFIG_NFS_FSCACHE
820 if (nfss->options & NFS_OPTION_FSCACHE) {
821 seq_printf(m, "\n\tfsc:\t");
822 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
823 seq_printf(m, "%Lu ", totals.bytes[i]);
824 }
825#endif
f7b422b1
DH		 826 seq_printf(m, "\n");
827
828 rpc_print_iostats(m, nfss->client);
829
830 return 0;
831}
832
833/*
834 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 835 * in response to xdev traversals and referrals
f7b422b1 836 */
fbdefd64 837void nfs_umount_begin(struct super_block *sb)
f7b422b1 838{
67e55205 839 struct nfs_server *server;
fc6ae3cf
TM		 840 struct rpc_clnt *rpc;
841
67e55205 842 server = NFS_SB(sb);
fc6ae3cf
TM		 843 /* -EIO all pending I/O */
844 rpc = server->client_acl;
845 if (!IS_ERR(rpc))
846 rpc_killall_tasks(rpc);
847 rpc = server->client;
848 if (!IS_ERR(rpc))
849 rpc_killall_tasks(rpc);
f7b422b1
DH		 850}
851
db833351 852static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 853{
854 struct nfs_parsed_mount_data *data;
855
856 data = kzalloc(sizeof(*data), GFP_KERNEL);
857 if (data) {
9423a08a
CL		 858 data->acregmin = NFS_DEF_ACREGMIN;
859 data->acregmax = NFS_DEF_ACREGMAX;
860 data->acdirmin = NFS_DEF_ACDIRMIN;
861 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 862 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 863 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 864 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 865 data->auth_flavors[0] = RPC_AUTH_UNIX;
866 data->auth_flavor_len = 1;
867 data->minorversion = 0;
b72e4f42 868 data->need_mount = true;
9937347a 869 data->net = current->nsproxy->net_ns;
8a0d551a 870 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 871 }
872 return data;
873}
874
8a0d551a
JL		 875static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
876{
877 if (data) {
878 kfree(data->client_address);
879 kfree(data->mount_server.hostname);
880 kfree(data->nfs_server.export_path);
881 kfree(data->nfs_server.hostname);
882 kfree(data->fscache_uniq);
883 security_free_mnt_opts(&data->lsm_opts);
884 kfree(data);
885 }
886}
887
fc50d58f 888/*
cdcd7f9a
CL		 889 * Sanity-check a server address provided by the mount command.
890 *
891 * Address family must be initialized, and address must not be
892 * the ANY address for that family.
fc50d58f
CL		 893 */
894static int nfs_verify_server_address(struct sockaddr *addr)
895{
896 switch (addr->sa_family) {
897 case AF_INET: {
cdcd7f9a 898 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 899 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 900 }
901 case AF_INET6: {
902 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
903 return !ipv6_addr_any(sa);
fc50d58f
CL		 904 }
905 }
906
53a0b9c4 907 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 908 return 0;
909}
910
4cfd74fc
CL		 911/*
912 * Select between a default port value and a user-specified port value.
913 * If a zero value is set, then autobind will be used.
914 */
f5855fec 915static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 916 const unsigned short default_port)
917{
f5855fec
TM		 918 if (*port == NFS_UNSPEC_PORT)
919 *port = default_port;
4cfd74fc 920
f5855fec 921 rpc_set_port(sap, *port);
4cfd74fc
CL		 922}
923
259875ef
TM		 924/*
925 * Sanity check the NFS transport protocol.
926 *
927 */
928static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
929{
930 switch (mnt->nfs_server.protocol) {
931 case XPRT_TRANSPORT_UDP:
932 case XPRT_TRANSPORT_TCP:
933 case XPRT_TRANSPORT_RDMA:
934 break;
935 default:
936 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
937 }
938}
939
940/*
941 * For text based NFSv2/v3 mounts, the mount protocol transport default
942 * settings should depend upon the specified NFS transport.
943 */
944static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
945{
946 nfs_validate_transport_protocol(mnt);
947
948 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
949 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
950 return;
951 switch (mnt->nfs_server.protocol) {
952 case XPRT_TRANSPORT_UDP:
953 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
954 break;
955 case XPRT_TRANSPORT_TCP:
956 case XPRT_TRANSPORT_RDMA:
957 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
958 }
959}
960
01060c89
CL		 961/*
962 * Parse the value of the 'sec=' option.
01060c89
CL		 963 */
964static int nfs_parse_security_flavors(char *value,
965 struct nfs_parsed_mount_data *mnt)
966{
967 substring_t args[MAX_OPT_ARGS];
968
969 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
970
971 switch (match_token(value, nfs_secflavor_tokens, args)) {
972 case Opt_sec_none:
01060c89
CL		 973 mnt->auth_flavors[0] = RPC_AUTH_NULL;
974 break;
975 case Opt_sec_sys:
01060c89
CL		 976 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
977 break;
978 case Opt_sec_krb5:
01060c89
CL		 979 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
980 break;
981 case Opt_sec_krb5i:
01060c89
CL		 982 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
983 break;
984 case Opt_sec_krb5p:
01060c89
CL		 985 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
986 break;
987 case Opt_sec_lkey:
01060c89
CL		 988 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
989 break;
990 case Opt_sec_lkeyi:
01060c89
CL		 991 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
992 break;
993 case Opt_sec_lkeyp:
01060c89
CL		 994 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
995 break;
996 case Opt_sec_spkm:
01060c89
CL		 997 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
998 break;
999 case Opt_sec_spkmi:
01060c89
CL		 1000 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1001 break;
1002 case Opt_sec_spkmp:
01060c89
CL		 1003 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1004 break;
1005 default:
1006 return 0;
1007 }
1008
9b7160c5 1009 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1010 mnt->auth_flavor_len = 1;
01060c89
CL		 1011 return 1;
1012}
1013
0d71b058
TM		 1014static int nfs_parse_version_string(char *string,
1015 struct nfs_parsed_mount_data *mnt,
1016 substring_t *args)
1017{
1018 mnt->flags &= ~NFS_MOUNT_VER3;
1019 switch (match_token(string, nfs_vers_tokens, args)) {
1020 case Opt_vers_2:
1021 mnt->version = 2;
1022 break;
1023 case Opt_vers_3:
1024 mnt->flags |= NFS_MOUNT_VER3;
1025 mnt->version = 3;
1026 break;
1027 case Opt_vers_4:
1028 /* Backward compatibility option. In future,
1029 * the mount program should always supply
1030 * a NFSv4 minor version number.
1031 */
1032 mnt->version = 4;
1033 break;
1034 case Opt_vers_4_0:
1035 mnt->version = 4;
1036 mnt->minorversion = 0;
1037 break;
1038 case Opt_vers_4_1:
1039 mnt->version = 4;
1040 mnt->minorversion = 1;
1041 break;
1042 default:
1043 return 0;
1044 }
1045 return 1;
1046}
1047
c5cb09b6
RL		 1048static int nfs_get_option_str(substring_t args[], char **option)
1049{
1050 kfree(*option);
1051 *option = match_strdup(args);
1052 return !option;
1053}
1054
1055static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1056{
1057 int rc;
1058 char *string;
1059
1060 string = match_strdup(args);
1061 if (string == NULL)
1062 return -ENOMEM;
1063 rc = strict_strtoul(string, 10, option);
1064 kfree(string);
1065
1066 return rc;
1067}
1068
bf0fd768
CL		 1069/*
1070 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1071 * a data structure. The whole mount string is processed; bad options are
1072 * skipped as they are encountered. If there were no errors, return 1;
1073 * otherwise return 0 (zero).
bf0fd768
CL		 1074 */
1075static int nfs_parse_mount_options(char *raw,
1076 struct nfs_parsed_mount_data *mnt)
1077{
f9c3a380 1078 char *p, *string, *secdata;
d23c45fd 1079 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1080 unsigned short protofamily = AF_UNSPEC;
1081 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1082
1083 if (!raw) {
1084 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1085 return 1;
1086 }
1087 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1088
f9c3a380
EP		 1089 secdata = alloc_secdata();
1090 if (!secdata)
1091 goto out_nomem;
1092
1093 rc = security_sb_copy_data(raw, secdata);
1094 if (rc)
1095 goto out_security_failure;
1096
1097 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1098 if (rc)
1099 goto out_security_failure;
1100
1101 free_secdata(secdata);
1102
bf0fd768
CL		 1103 while ((p = strsep(&raw, ",")) != NULL) {
1104 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1105 unsigned long option;
1106 int token;
bf0fd768
CL		 1107
1108 if (!*p)
1109 continue;
1110
1111 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1112
1113 token = match_token(p, nfs_mount_option_tokens, args);
1114 switch (token) {
f45663ce
CL		 1115
1116 /*
1117 * boolean options: foo/nofoo
1118 */
bf0fd768
CL		 1119 case Opt_soft:
1120 mnt->flags |= NFS_MOUNT_SOFT;
1121 break;
1122 case Opt_hard:
1123 mnt->flags &= ~NFS_MOUNT_SOFT;
1124 break;
bf0fd768
CL		 1125 case Opt_posix:
1126 mnt->flags |= NFS_MOUNT_POSIX;
1127 break;
1128 case Opt_noposix:
1129 mnt->flags &= ~NFS_MOUNT_POSIX;
1130 break;
1131 case Opt_cto:
1132 mnt->flags &= ~NFS_MOUNT_NOCTO;
1133 break;
1134 case Opt_nocto:
1135 mnt->flags |= NFS_MOUNT_NOCTO;
1136 break;
1137 case Opt_ac:
1138 mnt->flags &= ~NFS_MOUNT_NOAC;
1139 break;
1140 case Opt_noac:
1141 mnt->flags |= NFS_MOUNT_NOAC;
1142 break;
1143 case Opt_lock:
1144 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1145 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1146 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1147 break;
1148 case Opt_nolock:
1149 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1150 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1151 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1152 break;
bf0fd768
CL		 1153 case Opt_udp:
1154 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1155 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1156 break;
1157 case Opt_tcp:
1158 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1159 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1160 break;
2cf7ff7a
TT		 1161 case Opt_rdma:
1162 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1163 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1164 xprt_load_transport(p);
2cf7ff7a 1165 break;
bf0fd768
CL		 1166 case Opt_acl:
1167 mnt->flags &= ~NFS_MOUNT_NOACL;
1168 break;
1169 case Opt_noacl:
1170 mnt->flags |= NFS_MOUNT_NOACL;
1171 break;
1172 case Opt_rdirplus:
1173 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1174 break;
1175 case Opt_nordirplus:
1176 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1177 break;
75180df2
TM		 1178 case Opt_sharecache:
1179 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1180 break;
1181 case Opt_nosharecache:
1182 mnt->flags |= NFS_MOUNT_UNSHARED;
1183 break;
d740351b
CL		 1184 case Opt_resvport:
1185 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1186 break;
1187 case Opt_noresvport:
1188 mnt->flags |= NFS_MOUNT_NORESVPORT;
1189 break;
b797cac7
DH		 1190 case Opt_fscache:
1191 mnt->options |= NFS_OPTION_FSCACHE;
1192 kfree(mnt->fscache_uniq);
1193 mnt->fscache_uniq = NULL;
1194 break;
1195 case Opt_nofscache:
1196 mnt->options &= ~NFS_OPTION_FSCACHE;
1197 kfree(mnt->fscache_uniq);
1198 mnt->fscache_uniq = NULL;
1199 break;
bf0fd768 1200
f45663ce
CL		 1201 /*
1202 * options that take numeric values
1203 */
bf0fd768 1204 case Opt_port:
c5cb09b6
RL		 1205 if (nfs_get_option_ul(args, &option) ||
1206 option > USHRT_MAX)
d23c45fd
CL		 1207 goto out_invalid_value;
1208 mnt->nfs_server.port = option;
bf0fd768
CL		 1209 break;
1210 case Opt_rsize:
c5cb09b6 1211 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1212 goto out_invalid_value;
1213 mnt->rsize = option;
bf0fd768
CL		 1214 break;
1215 case Opt_wsize:
c5cb09b6 1216 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1217 goto out_invalid_value;
1218 mnt->wsize = option;
bf0fd768
CL		 1219 break;
1220 case Opt_bsize:
c5cb09b6 1221 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1222 goto out_invalid_value;
1223 mnt->bsize = option;
bf0fd768
CL		 1224 break;
1225 case Opt_timeo:
c5cb09b6 1226 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1227 goto out_invalid_value;
1228 mnt->timeo = option;
bf0fd768
CL		 1229 break;
1230 case Opt_retrans:
c5cb09b6 1231 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1232 goto out_invalid_value;
1233 mnt->retrans = option;
bf0fd768
CL		 1234 break;
1235 case Opt_acregmin:
c5cb09b6 1236 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1237 goto out_invalid_value;
1238 mnt->acregmin = option;
bf0fd768
CL		 1239 break;
1240 case Opt_acregmax:
c5cb09b6 1241 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1242 goto out_invalid_value;
1243 mnt->acregmax = option;
bf0fd768
CL		 1244 break;
1245 case Opt_acdirmin:
c5cb09b6 1246 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1247 goto out_invalid_value;
1248 mnt->acdirmin = option;
bf0fd768
CL		 1249 break;
1250 case Opt_acdirmax:
c5cb09b6 1251 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1252 goto out_invalid_value;
1253 mnt->acdirmax = option;
bf0fd768
CL		 1254 break;
1255 case Opt_actimeo:
c5cb09b6 1256 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1257 goto out_invalid_value;
1258 mnt->acregmin = mnt->acregmax =
1259 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1260 break;
1261 case Opt_namelen:
c5cb09b6 1262 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1263 goto out_invalid_value;
1264 mnt->namlen = option;
bf0fd768
CL		 1265 break;
1266 case Opt_mountport:
c5cb09b6
RL		 1267 if (nfs_get_option_ul(args, &option) ||
1268 option > USHRT_MAX)
d23c45fd
CL		 1269 goto out_invalid_value;
1270 mnt->mount_server.port = option;
bf0fd768 1271 break;
bf0fd768 1272 case Opt_mountvers:
c5cb09b6 1273 if (nfs_get_option_ul(args, &option) ||
f45663ce 1274 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1275 option > NFS_MNT3_VERSION)
1276 goto out_invalid_value;
1277 mnt->mount_server.version = option;
bf0fd768 1278 break;
3fd5be9e 1279 case Opt_minorversion:
c5cb09b6 1280 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1281 goto out_invalid_value;
1282 if (option > NFS4_MAX_MINOR_VERSION)
1283 goto out_invalid_value;
1284 mnt->minorversion = option;
3fd5be9e 1285 break;
bf0fd768 1286
f45663ce
CL		 1287 /*
1288 * options that take text values
1289 */
0d71b058
TM		 1290 case Opt_nfsvers:
1291 string = match_strdup(args);
1292 if (string == NULL)
1293 goto out_nomem;
1294 rc = nfs_parse_version_string(string, mnt, args);
1295 kfree(string);
1296 if (!rc)
1297 goto out_invalid_value;
1298 break;
bf0fd768
CL		 1299 case Opt_sec:
1300 string = match_strdup(args);
1301 if (string == NULL)
1302 goto out_nomem;
01060c89 1303 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1304 kfree(string);
f45663ce 1305 if (!rc) {
f45663ce
CL		 1306 dfprintk(MOUNT, "NFS: unrecognized "
1307 "security flavor\n");
d23c45fd 1308 return 0;
f45663ce 1309 }
bf0fd768
CL		 1310 break;
1311 case Opt_proto:
1312 string = match_strdup(args);
1313 if (string == NULL)
1314 goto out_nomem;
1315 token = match_token(string,
1316 nfs_xprt_protocol_tokens, args);
bf0fd768 1317
ee671b01 1318 protofamily = AF_INET;
bf0fd768 1319 switch (token) {
ee671b01
JL		 1320 case Opt_xprt_udp6:
1321 protofamily = AF_INET6;
fdb66ff4 1322 case Opt_xprt_udp:
bf0fd768 1323 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1324 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1325 break;
ee671b01
JL		 1326 case Opt_xprt_tcp6:
1327 protofamily = AF_INET6;
fdb66ff4 1328 case Opt_xprt_tcp:
bf0fd768 1329 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1330 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1331 break;
2cf7ff7a
TT		 1332 case Opt_xprt_rdma:
1333 /* vector side protocols to TCP */
1334 mnt->flags |= NFS_MOUNT_TCP;
1335 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1336 xprt_load_transport(string);
2cf7ff7a 1337 break;
bf0fd768 1338 default:
f45663ce
CL		 1339 dfprintk(MOUNT, "NFS: unrecognized "
1340 "transport protocol\n");
4223a4a1 1341 kfree(string);
d23c45fd 1342 return 0;
bf0fd768 1343 }
c5cb09b6 1344 kfree(string);
bf0fd768
CL		 1345 break;
1346 case Opt_mountproto:
1347 string = match_strdup(args);
1348 if (string == NULL)
1349 goto out_nomem;
1350 token = match_token(string,
1351 nfs_xprt_protocol_tokens, args);
d508afb4 1352 kfree(string);
bf0fd768 1353
ee671b01 1354 mountfamily = AF_INET;
bf0fd768 1355 switch (token) {
ee671b01
JL		 1356 case Opt_xprt_udp6:
1357 mountfamily = AF_INET6;
fdb66ff4 1358 case Opt_xprt_udp:
0896a725 1359 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1360 break;
ee671b01
JL		 1361 case Opt_xprt_tcp6:
1362 mountfamily = AF_INET6;
fdb66ff4 1363 case Opt_xprt_tcp:
0896a725 1364 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1365 break;
2cf7ff7a 1366 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1367 default:
f45663ce
CL		 1368 dfprintk(MOUNT, "NFS: unrecognized "
1369 "transport protocol\n");
d23c45fd 1370 return 0;
bf0fd768
CL		 1371 }
1372 break;
1373 case Opt_addr:
1374 string = match_strdup(args);
1375 if (string == NULL)
1376 goto out_nomem;
53a0b9c4 1377 mnt->nfs_server.addrlen =
b48e1278 1378 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1379 (struct sockaddr *)
1380 &mnt->nfs_server.address,
1381 sizeof(mnt->nfs_server.address));
bf0fd768 1382 kfree(string);
53a0b9c4
CL		 1383 if (mnt->nfs_server.addrlen == 0)
1384 goto out_invalid_address;
bf0fd768
CL		 1385 break;
1386 case Opt_clientaddr:
c5cb09b6 1387 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1388 goto out_nomem;
bf0fd768 1389 break;
33832034 1390 case Opt_mounthost:
c5cb09b6
RL		 1391 if (nfs_get_option_str(args,
1392 &mnt->mount_server.hostname))
33832034 1393 goto out_nomem;
33832034 1394 break;
0ac83779 1395 case Opt_mountaddr:
bf0fd768
CL		 1396 string = match_strdup(args);
1397 if (string == NULL)
1398 goto out_nomem;
53a0b9c4 1399 mnt->mount_server.addrlen =
b48e1278 1400 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1401 (struct sockaddr *)
1402 &mnt->mount_server.address,
1403 sizeof(mnt->mount_server.address));
bf0fd768 1404 kfree(string);
53a0b9c4
CL		 1405 if (mnt->mount_server.addrlen == 0)
1406 goto out_invalid_address;
bf0fd768 1407 break;
7973c1f1
TM		 1408 case Opt_lookupcache:
1409 string = match_strdup(args);
1410 if (string == NULL)
1411 goto out_nomem;
1412 token = match_token(string,
1413 nfs_lookupcache_tokens, args);
1414 kfree(string);
1415 switch (token) {
1416 case Opt_lookupcache_all:
1417 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1418 break;
1419 case Opt_lookupcache_positive:
1420 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1421 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1422 break;
1423 case Opt_lookupcache_none:
1424 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1425 break;
1426 default:
7973c1f1
TM		 1427 dfprintk(MOUNT, "NFS: invalid "
1428 "lookupcache argument\n");
d23c45fd 1429 return 0;
7973c1f1
TM		 1430 };
1431 break;
a6d5ff64 1432 case Opt_fscache_uniq:
c5cb09b6 1433 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1434 goto out_nomem;
a6d5ff64
CL		 1435 mnt->options |= NFS_OPTION_FSCACHE;
1436 break;
5eebde23
SJ		 1437 case Opt_local_lock:
1438 string = match_strdup(args);
1439 if (string == NULL)
1440 goto out_nomem;
1441 token = match_token(string, nfs_local_lock_tokens,
1442 args);
1443 kfree(string);
1444 switch (token) {
1445 case Opt_local_lock_all:
1446 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1447 NFS_MOUNT_LOCAL_FCNTL);
1448 break;
1449 case Opt_local_lock_flock:
1450 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1451 break;
1452 case Opt_local_lock_posix:
1453 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1454 break;
1455 case Opt_local_lock_none:
1456 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1457 NFS_MOUNT_LOCAL_FCNTL);
1458 break;
1459 default:
1460 dfprintk(MOUNT, "NFS: invalid "
1461 "local_lock argument\n");
1462 return 0;
1463 };
1464 break;
bf0fd768 1465
f45663ce
CL		 1466 /*
1467 * Special options
1468 */
1469 case Opt_sloppy:
1470 sloppy = 1;
1471 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1472 break;
bf0fd768
CL		 1473 case Opt_userspace:
1474 case Opt_deprecated:
d33e4dfe
CL		 1475 dfprintk(MOUNT, "NFS: ignoring mount option "
1476 "'%s'\n", p);
bf0fd768
CL		 1477 break;
1478
1479 default:
d23c45fd 1480 invalid_option = 1;
f45663ce
CL		 1481 dfprintk(MOUNT, "NFS: unrecognized mount option "
1482 "'%s'\n", p);
bf0fd768
CL		 1483 }
1484 }
1485
d23c45fd
CL		 1486 if (!sloppy && invalid_option)
1487 return 0;
1488
571b7554
WAA		 1489 if (mnt->minorversion && mnt->version != 4)
1490 goto out_minorversion_mismatch;
1491
ee671b01
JL		 1492 /*
1493 * verify that any proto=/mountproto= options match the address
1494 * familiies in the addr=/mountaddr= options.
1495 */
1496 if (protofamily != AF_UNSPEC &&
1497 protofamily != mnt->nfs_server.address.ss_family)
1498 goto out_proto_mismatch;
1499
1500 if (mountfamily != AF_UNSPEC) {
1501 if (mnt->mount_server.addrlen) {
1502 if (mountfamily != mnt->mount_server.address.ss_family)
1503 goto out_mountproto_mismatch;
1504 } else {
1505 if (mountfamily != mnt->nfs_server.address.ss_family)
1506 goto out_mountproto_mismatch;
1507 }
1508 }
1509
bf0fd768
CL		 1510 return 1;
1511
ee671b01
JL		 1512out_mountproto_mismatch:
1513 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1514 "option\n");
1515 return 0;
1516out_proto_mismatch:
1517 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1518 return 0;
53a0b9c4
CL		 1519out_invalid_address:
1520 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1521 return 0;
d23c45fd 1522out_invalid_value:
53a0b9c4 1523 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1524 return 0;
571b7554
WAA		 1525out_minorversion_mismatch:
1526 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1527 "minorversion=%u\n", mnt->version, mnt->minorversion);
1528 return 0;
bf0fd768
CL		 1529out_nomem:
1530 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1531 return 0;
f9c3a380
EP		 1532out_security_failure:
1533 free_secdata(secdata);
1534 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1535 return 0;
bf0fd768
CL		 1536}
1537
ec88f28d
CL		 1538/*
1539 * Match the requested auth flavors with the list returned by
1540 * the server. Returns zero and sets the mount's authentication
1541 * flavor on success; returns -EACCES if server does not support
1542 * the requested flavor.
1543 */
1544static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1545 struct nfs_mount_request *request)
1546{
1547 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1548
5eecfde6
CL		 1549 /*
1550 * Certain releases of Linux's mountd return an empty
1551 * flavor list. To prevent behavioral regression with
1552 * these servers (ie. rejecting mounts that used to
1553 * succeed), revert to pre-2.6.32 behavior (no checking)
1554 * if the returned flavor list is empty.
1555 */
1556 if (server_authlist_len == 0)
1557 return 0;
1558
ec88f28d
CL		 1559 /*
1560 * We avoid sophisticated negotiating here, as there are
1561 * plenty of cases where we can get it wrong, providing
1562 * either too little or too much security.
1563 *
1564 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1565 * flavor listed first. However, some servers list
1566 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1567 * preferred default, in args->auth_flavors[0] if user
1568 * didn't specify sec= mount option.
1569 */
1570 for (i = 0; i < args->auth_flavor_len; i++)
1571 for (j = 0; j < server_authlist_len; j++)
1572 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1573 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1574 request->auth_flavs[j]);
1575 args->auth_flavors[0] = request->auth_flavs[j];
1576 return 0;
1577 }
1578
1579 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1580 nfs_umount(request);
1581 return -EACCES;
1582}
1583
0076d7b7
CL		 1584/*
1585 * Use the remote server's MOUNT service to request the NFS file handle
1586 * corresponding to the provided path.
1587 */
486aa699
BS		 1588static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1589 struct nfs_fh *root_fh)
0076d7b7 1590{
ec88f28d
CL		 1591 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1592 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1593 struct nfs_mount_request request = {
1594 .sap = (struct sockaddr *)
1595 &args->mount_server.address,
1596 .dirpath = args->nfs_server.export_path,
1597 .protocol = args->mount_server.protocol,
1598 .fh = root_fh,
50a737f8 1599 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1600 .auth_flav_len = &server_authlist_len,
1601 .auth_flavs = server_authlist,
6d59b8d5 1602 .net = args->net,
c5d120f8 1603 };
4c568017 1604 int status;
0076d7b7
CL		 1605
1606 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1607 switch (args->version) {
1608 default:
1609 args->mount_server.version = NFS_MNT3_VERSION;
1610 break;
1611 case 2:
1612 args->mount_server.version = NFS_MNT_VERSION;
1613 }
0076d7b7 1614 }
c5d120f8 1615 request.version = args->mount_server.version;
0076d7b7 1616
33832034 1617 if (args->mount_server.hostname)
c5d120f8 1618 request.hostname = args->mount_server.hostname;
33832034 1619 else
c5d120f8 1620 request.hostname = args->nfs_server.hostname;
33832034 1621
0076d7b7
CL		 1622 /*
1623 * Construct the mount server's address.
1624 */
4c568017 1625 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1626 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1627 args->nfs_server.addrlen);
1628 args->mount_server.addrlen = args->nfs_server.addrlen;
1629 }
c5d120f8 1630 request.salen = args->mount_server.addrlen;
f5855fec 1631 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1632
1633 /*
1634 * Now ask the mount server to map our export path
1635 * to a file handle.
1636 */
c5d120f8 1637 status = nfs_mount(&request);
ec88f28d
CL		 1638 if (status != 0) {
1639 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1640 request.hostname, status);
1641 return status;
1642 }
0076d7b7 1643
ec88f28d
CL		 1644 /*
1645 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1646 */
1647 if (args->mount_server.version != NFS_MNT3_VERSION)
1648 return 0;
1649 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1650}
1651
486aa699 1652static struct dentry *nfs_try_mount(int flags, const char *dev_name,
486aa699
BS		 1653 struct nfs_mount_info *mount_info)
1654{
1655 int status;
1656 struct nfs_server *server;
1657
b72e4f42 1658 if (mount_info->parsed->need_mount) {
87c7083d 1659 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
b72e4f42
BS		 1660 if (status)
1661 return ERR_PTR(status);
1662 }
486aa699
BS		 1663
1664 /* Get a volume representation */
87c7083d 1665 server = nfs_create_server(mount_info->parsed, mount_info->mntfh);
486aa699
BS		 1666 if (IS_ERR(server))
1667 return ERR_CAST(server);
1668
87c7083d 1669 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info);
486aa699
BS		 1670}
1671
c12bacec
RL		 1672/*
1673 * Split "dev_name" into "hostname:export_path".
1674 *
1675 * The leftmost colon demarks the split between the server's hostname
1676 * and the export path. If the hostname starts with a left square
1677 * bracket, then it may contain colons.
1678 *
1679 * Note: caller frees hostname and export path, even on error.
1680 */
1681static int nfs_parse_devname(const char *dev_name,
1682 char **hostname, size_t maxnamlen,
1683 char **export_path, size_t maxpathlen)
dc045898
CL		 1684{
1685 size_t len;
c12bacec 1686 char *end;
dc045898 1687
c12bacec
RL		 1688 /* Is the host name protected with square brakcets? */
1689 if (*dev_name == '[') {
1690 end = strchr(++dev_name, ']');
1691 if (end == NULL || end[1] != ':')
dc045898 1692 goto out_bad_devname;
dc045898 1693
c12bacec
RL		 1694 len = end - dev_name;
1695 end++;
1696 } else {
1697 char *comma;
dc045898 1698
c12bacec
RL		 1699 end = strchr(dev_name, ':');
1700 if (end == NULL)
1701 goto out_bad_devname;
1702 len = end - dev_name;
d1aa0825 1703
c12bacec
RL		 1704 /* kill possible hostname list: not supported */
1705 comma = strchr(dev_name, ',');
1706 if (comma != NULL && comma < end)
1707 *comma = 0;
1708 }
d1aa0825 1709
d1aa0825
CL		 1710 if (len > maxnamlen)
1711 goto out_hostname;
1712
1713 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1714 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1715 if (*hostname == NULL)
1716 goto out_nomem;
c12bacec 1717 len = strlen(++end);
d1aa0825
CL		 1718 if (len > maxpathlen)
1719 goto out_path;
1720 *export_path = kstrndup(end, len, GFP_KERNEL);
1721 if (!*export_path)
1722 goto out_nomem;
1723
c12bacec 1724 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1725 return 0;
1726
1727out_bad_devname:
1728 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1729 return -EINVAL;
1730
1731out_nomem:
1732 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1733 return -ENOMEM;
1734
1735out_hostname:
1736 dfprintk(MOUNT, "NFS: server hostname too long\n");
1737 return -ENAMETOOLONG;
1738
1739out_path:
1740 dfprintk(MOUNT, "NFS: export pathname too long\n");
1741 return -ENAMETOOLONG;
1742}
1743
f7b422b1 1744/*
54ceac45
DH		 1745 * Validate the NFS2/NFS3 mount data
1746 * - fills in the mount root filehandle
136d558c
CL		 1747 *
1748 * For option strings, user space handles the following behaviors:
1749 *
1750 * + DNS: mapping server host name to IP address ("addr=" option)
1751 *
1752 * + failure mode: how to behave if a mount request can't be handled
1753 * immediately ("fg/bg" option)
1754 *
1755 * + retry: how often to retry a mount request ("retry=" option)
1756 *
1757 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1758 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1759 */
d72c727c
BS		 1760static int nfs23_validate_mount_data(void *options,
1761 struct nfs_parsed_mount_data *args,
1762 struct nfs_fh *mntfh,
1763 const char *dev_name)
f7b422b1 1764{
2283f8d6 1765 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1766 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1767
5df36e78
CL		 1768 if (data == NULL)
1769 goto out_no_data;
f7b422b1 1770
c5afc8da 1771 args->version = NFS_DEFAULT_VERSION;
54ceac45 1772 switch (data->version) {
5df36e78
CL		 1773 case 1:
1774 data->namlen = 0;
1775 case 2:
1776 data->bsize = 0;
1777 case 3:
1778 if (data->flags & NFS_MOUNT_VER3)
1779 goto out_no_v3;
1780 data->root.size = NFS2_FHSIZE;
1781 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1782 case 4:
1783 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1784 goto out_no_sec;
1785 case 5:
1786 memset(data->context, 0, sizeof(data->context));
1787 case 6:
b7e24457
TM		 1788 if (data->flags & NFS_MOUNT_VER3) {
1789 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1790 goto out_invalid_fh;
5df36e78 1791 mntfh->size = data->root.size;
764302cc
CL		 1792 args->version = 3;
1793 } else {
5df36e78 1794 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1795 args->version = 2;
1796 }
5df36e78 1797
5df36e78
CL		 1798
1799 memcpy(mntfh->data, data->root.data, mntfh->size);
1800 if (mntfh->size < sizeof(mntfh->data))
1801 memset(mntfh->data + mntfh->size, 0,
1802 sizeof(mntfh->data) - mntfh->size);
6e88e061 1803
2283f8d6
TT		 1804 /*
1805 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1806 * can deal with.
1807 */
ff3525a5 1808 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1809 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1810 args->rsize = data->rsize;
1811 args->wsize = data->wsize;
2283f8d6
TT		 1812 args->timeo = data->timeo;
1813 args->retrans = data->retrans;
1814 args->acregmin = data->acregmin;
1815 args->acregmax = data->acregmax;
1816 args->acdirmin = data->acdirmin;
1817 args->acdirmax = data->acdirmax;
b72e4f42 1818 args->need_mount = false;
4c568017 1819
4cfd74fc 1820 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1821 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1822 if (!nfs_verify_server_address(sap))
4c568017
CL		 1823 goto out_no_address;
1824
2283f8d6 1825 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1826 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1827 /* N.B. caller will free nfs_server.hostname in all cases */
1828 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1829 args->namlen = data->namlen;
1830 args->bsize = data->bsize;
dd07c947
CL		 1831
1832 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1833 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1834 if (!args->nfs_server.hostname)
1835 goto out_nomem;
f9c3a380 1836
5eebde23
SJ		 1837 if (!(data->flags & NFS_MOUNT_NONLM))
1838 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1839 NFS_MOUNT_LOCAL_FCNTL);
1840 else
1841 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1842 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1843 /*
1844 * The legacy version 6 binary mount data from userspace has a
1845 * field used only to transport selinux information into the
1846 * the kernel. To continue to support that functionality we
1847 * have a touch of selinux knowledge here in the NFS code. The
1848 * userspace code converted context=blah to just blah so we are
1849 * converting back to the full string selinux understands.
1850 */
1851 if (data->context[0]){
1852#ifdef CONFIG_SECURITY_SELINUX
1853 int rc;
1854 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1855 if (!opts_str)
1856 return -ENOMEM;
1857 strcpy(opts_str, "context=");
1858 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1859 strcat(opts_str, &data->context[0]);
1860 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1861 kfree(opts_str);
1862 if (rc)
1863 return rc;
1864#else
1865 return -EINVAL;
1866#endif
1867 }
1868
5df36e78 1869 break;
b72e4f42
BS		 1870 default:
1871 return NFS_TEXT_DATA;
f7b422b1 1872 }
54ceac45
DH		 1873
1874#ifndef CONFIG_NFS_V3
8a6e5deb 1875 if (args->version == 3)
5df36e78
CL		 1876 goto out_v3_not_compiled;
1877#endif /* !CONFIG_NFS_V3 */
f7b422b1 1878
5df36e78 1879 return 0;
f7b422b1 1880
5df36e78
CL		 1881out_no_data:
1882 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1883 return -EINVAL;
54ceac45 1884
5df36e78
CL		 1885out_no_v3:
1886 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1887 data->version);
1888 return -EINVAL;
f7b422b1 1889
5df36e78
CL		 1890out_no_sec:
1891 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1892 return -EINVAL;
1893
5df36e78
CL		 1894#ifndef CONFIG_NFS_V3
1895out_v3_not_compiled:
1896 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1897 return -EPROTONOSUPPORT;
1898#endif /* !CONFIG_NFS_V3 */
1899
63649bd7
CG		 1900out_nomem:
1901 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1902 return -ENOMEM;
1903
5df36e78
CL		 1904out_no_address:
1905 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1906 return -EINVAL;
1907
1908out_invalid_fh:
1909 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1910 return -EINVAL;
f7b422b1
DH		 1911}
1912
d72c727c
BS		 1913#ifdef CONFIG_NFS_V4
1914static int nfs_validate_mount_data(struct file_system_type *fs_type,
1915 void *options,
1916 struct nfs_parsed_mount_data *args,
1917 struct nfs_fh *mntfh,
1918 const char *dev_name)
1919{
1920 if (fs_type == &nfs_fs_type)
1921 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1922 return nfs4_validate_mount_data(options, args, dev_name);
1923}
1924#else
1925static int nfs_validate_mount_data(struct file_system_type *fs_type,
1926 void *options,
1927 struct nfs_parsed_mount_data *args,
1928 struct nfs_fh *mntfh,
1929 const char *dev_name)
1930{
1931 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1932}
1933#endif
1934
b72e4f42
BS		 1935static int nfs_validate_text_mount_data(void *options,
1936 struct nfs_parsed_mount_data *args,
1937 const char *dev_name)
1938{
1939 int port = 0;
1940 int max_namelen = PAGE_SIZE;
1941 int max_pathlen = NFS_MAXPATHLEN;
1942 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1943
1944 if (nfs_parse_mount_options((char *)options, args) == 0)
1945 return -EINVAL;
1946
1947 if (!nfs_verify_server_address(sap))
1948 goto out_no_address;
1949
1950 if (args->version == 4) {
1951#ifdef CONFIG_NFS_V4
1952 port = NFS_PORT;
1953 max_namelen = NFS4_MAXNAMLEN;
1954 max_pathlen = NFS4_MAXPATHLEN;
1955 nfs_validate_transport_protocol(args);
1956 nfs4_validate_mount_flags(args);
1957#else
1958 goto out_v4_not_compiled;
1959#endif /* CONFIG_NFS_V4 */
1960 } else
1961 nfs_set_mount_transport_protocol(args);
1962
1963 nfs_set_port(sap, &args->nfs_server.port, port);
1964
1965 if (args->auth_flavor_len > 1)
1966 goto out_bad_auth;
1967
1968 return nfs_parse_devname(dev_name,
1969 &args->nfs_server.hostname,
1970 max_namelen,
1971 &args->nfs_server.export_path,
1972 max_pathlen);
1973
1974#ifndef CONFIG_NFS_V4
1975out_v4_not_compiled:
1976 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1977 return -EPROTONOSUPPORT;
1978#endif /* !CONFIG_NFS_V4 */
1979
1980out_no_address:
1981 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1982 return -EINVAL;
1983
1984out_bad_auth:
1985 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
1986 return -EINVAL;
1987}
1988
48b605f8
JL		 1989static int
1990nfs_compare_remount_data(struct nfs_server *nfss,
1991 struct nfs_parsed_mount_data *data)
1992{
1993 if (data->flags != nfss->flags ||
1994 data->rsize != nfss->rsize ||
1995 data->wsize != nfss->wsize ||
1996 data->retrans != nfss->client->cl_timeout->to_retries ||
1997 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1998 data->acregmin != nfss->acregmin / HZ ||
1999 data->acregmax != nfss->acregmax / HZ ||
2000 data->acdirmin != nfss->acdirmin / HZ ||
2001 data->acdirmax != nfss->acdirmax / HZ ||
2002 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2003 data->nfs_server.port != nfss->port ||
48b605f8 2004 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2005 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2006 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2007 return -EINVAL;
2008
2009 return 0;
2010}
2011
fbdefd64 2012int
48b605f8
JL		 2013nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2014{
2015 int error;
2016 struct nfs_server *nfss = sb->s_fs_info;
2017 struct nfs_parsed_mount_data *data;
2018 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2019 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2020 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2021
2022 /*
2023 * Userspace mount programs that send binary options generally send
2024 * them populated with default values. We have no way to know which
2025 * ones were explicitly specified. Fall back to legacy behavior and
2026 * just return success.
2027 */
31c94469
MZ		 2028 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2029 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2030 options->version <= 6))))
48b605f8
JL		 2031 return 0;
2032
2033 data = kzalloc(sizeof(*data), GFP_KERNEL);
2034 if (data == NULL)
2035 return -ENOMEM;
2036
2037 /* fill out struct with values from existing mount */
2038 data->flags = nfss->flags;
2039 data->rsize = nfss->rsize;
2040 data->wsize = nfss->wsize;
2041 data->retrans = nfss->client->cl_timeout->to_retries;
2042 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2043 data->acregmin = nfss->acregmin / HZ;
2044 data->acregmax = nfss->acregmax / HZ;
2045 data->acdirmin = nfss->acdirmin / HZ;
2046 data->acdirmax = nfss->acdirmax / HZ;
2047 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2048 data->nfs_server.port = nfss->port;
48b605f8
JL		 2049 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2050 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2051 data->nfs_server.addrlen);
2052
2053 /* overwrite those values with any that were specified */
2054 error = nfs_parse_mount_options((char *)options, data);
2055 if (error < 0)
2056 goto out;
2057
26c4c170
JL		 2058 /*
2059 * noac is a special case. It implies -o sync, but that's not
2060 * necessarily reflected in the mtab options. do_remount_sb
2061 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2062 * remount options, so we have to explicitly reset it.
2063 */
2064 if (data->flags & NFS_MOUNT_NOAC)
2065 *flags |= MS_SYNCHRONOUS;
2066
48b605f8
JL		 2067 /* compare new mount options with old ones */
2068 error = nfs_compare_remount_data(nfss, data);
2069out:
2070 kfree(data);
2071 return error;
2072}
2073
f7b422b1 2074/*
54ceac45 2075 * Initialise the common bits of the superblock
f7b422b1 2076 */
fbdefd64 2077inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2078{
54ceac45 2079 struct nfs_server *server = NFS_SB(sb);
5006a76c 2080
54ceac45 2081 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2082
54ceac45
DH		 2083 /* We probably want something more informative here */
2084 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2085 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2086
54ceac45
DH		 2087 if (sb->s_blocksize == 0)
2088 sb->s_blocksize = nfs_block_bits(server->wsize,
2089 &sb->s_blocksize_bits);
f7b422b1 2090
32a88aa1
JA		 2091 sb->s_bdi = &server->backing_dev_info;
2092
54ceac45 2093 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2094}
2095
2096/*
54ceac45 2097 * Finish setting up an NFS2/3 superblock
f7b422b1 2098 */
fbdefd64 2099void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2100{
c40f8d1d 2101 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2102 struct nfs_server *server = NFS_SB(sb);
5006a76c 2103
54ceac45
DH		 2104 sb->s_blocksize_bits = 0;
2105 sb->s_blocksize = 0;
2106 if (data->bsize)
2107 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2108
8a6e5deb 2109 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2110 /* The VFS shouldn't apply the umask to mode bits. We will do
2111 * so ourselves when necessary.
2112 */
2113 sb->s_flags |= MS_POSIXACL;
2114 sb->s_time_gran = 1;
816724e6 2115 }
54ceac45
DH		 2116
2117 sb->s_op = &nfs_sops;
2118 nfs_initialise_sb(sb);
f7b422b1
DH		 2119}
2120
2121/*
3cadf4b8 2122 * Finish setting up a cloned NFS2/3/4 superblock
f7b422b1 2123 */
fbdefd64 2124void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2125{
8c958e0c 2126 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2127 struct nfs_server *server = NFS_SB(sb);
2128
2129 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2130 sb->s_blocksize = old_sb->s_blocksize;
2131 sb->s_maxbytes = old_sb->s_maxbytes;
3cadf4b8
BS		 2132 sb->s_xattr = old_sb->s_xattr;
2133 sb->s_op = old_sb->s_op;
2134 sb->s_time_gran = 1;
f7b422b1 2135
3cadf4b8 2136 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2137 /* The VFS shouldn't apply the umask to mode bits. We will do
2138 * so ourselves when necessary.
f7b422b1
DH		 2139 */
2140 sb->s_flags |= MS_POSIXACL;
f7b422b1
DH		 2141 }
2142
54ceac45 2143 nfs_initialise_sb(sb);
f7b422b1
DH		 2144}
2145
275a5d24
TM		 2146static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2147{
2148 const struct nfs_server *a = s->s_fs_info;
2149 const struct rpc_clnt *clnt_a = a->client;
2150 const struct rpc_clnt *clnt_b = b->client;
2151
2152 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2153 goto Ebusy;
2154 if (a->nfs_client != b->nfs_client)
2155 goto Ebusy;
2156 if (a->flags != b->flags)
2157 goto Ebusy;
2158 if (a->wsize != b->wsize)
2159 goto Ebusy;
2160 if (a->rsize != b->rsize)
2161 goto Ebusy;
2162 if (a->acregmin != b->acregmin)
2163 goto Ebusy;
2164 if (a->acregmax != b->acregmax)
2165 goto Ebusy;
2166 if (a->acdirmin != b->acdirmin)
2167 goto Ebusy;
2168 if (a->acdirmax != b->acdirmax)
2169 goto Ebusy;
2170 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2171 goto Ebusy;
e89a5a43 2172 return 1;
275a5d24 2173Ebusy:
e89a5a43
TM		 2174 return 0;
2175}
2176
2177struct nfs_sb_mountdata {
2178 struct nfs_server *server;
2179 int mntflags;
2180};
2181
2182static int nfs_set_super(struct super_block *s, void *data)
2183{
2184 struct nfs_sb_mountdata *sb_mntdata = data;
2185 struct nfs_server *server = sb_mntdata->server;
2186 int ret;
2187
2188 s->s_flags = sb_mntdata->mntflags;
2189 s->s_fs_info = server;
8b244ff2 2190 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2191 ret = set_anon_super(s, server);
2192 if (ret == 0)
2193 server->s_dev = s->s_dev;
2194 return ret;
2195}
2196
fd00a8ff
CL		 2197static int nfs_compare_super_address(struct nfs_server *server1,
2198 struct nfs_server *server2)
2199{
2200 struct sockaddr *sap1, *sap2;
2201
2202 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2203 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2204
2205 if (sap1->sa_family != sap2->sa_family)
2206 return 0;
2207
2208 switch (sap1->sa_family) {
2209 case AF_INET: {
2210 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2211 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2212 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2213 return 0;
2214 if (sin1->sin_port != sin2->sin_port)
2215 return 0;
2216 break;
2217 }
2218 case AF_INET6: {
2219 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2220 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2221 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2222 return 0;
2223 if (sin1->sin6_port != sin2->sin6_port)
2224 return 0;
2225 break;
2226 }
2227 default:
2228 return 0;
2229 }
2230
2231 return 1;
2232}
2233
e89a5a43
TM		 2234static int nfs_compare_super(struct super_block *sb, void *data)
2235{
2236 struct nfs_sb_mountdata *sb_mntdata = data;
2237 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2238 int mntflags = sb_mntdata->mntflags;
2239
fd00a8ff 2240 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2241 return 0;
2242 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2243 if (old->flags & NFS_MOUNT_UNSHARED)
2244 return 0;
2245 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2246 return 0;
2247 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2248}
2249
39ffb921 2250#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2251static void nfs_get_cache_cookie(struct super_block *sb,
2252 struct nfs_parsed_mount_data *parsed,
2253 struct nfs_clone_mount *cloned)
2254{
2255 char *uniq = NULL;
2256 int ulen = 0;
2257
2258 if (parsed && parsed->fscache_uniq) {
2259 uniq = parsed->fscache_uniq;
2260 ulen = strlen(parsed->fscache_uniq);
2261 } else if (cloned) {
2262 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2263 if (mnt_s->fscache_key) {
2264 uniq = mnt_s->fscache_key->key.uniquifier;
2265 ulen = mnt_s->fscache_key->key.uniq_len;
2266 };
2267 }
2268
2269 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2270}
39ffb921
TM		 2271#else
2272static void nfs_get_cache_cookie(struct super_block *sb,
2273 struct nfs_parsed_mount_data *parsed,
2274 struct nfs_clone_mount *cloned)
2275{
2276}
2277#endif
2311b943 2278
fa799759
MS		 2279static int nfs_bdi_register(struct nfs_server *server)
2280{
2281 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2282}
2283
fbdefd64
BS		 2284int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2285 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2286{
2287 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2288}
2289
fbdefd64
BS		 2290int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2291 struct nfs_mount_info *mount_info)
3d176e3f
BS		 2292{
2293 /* clone any lsm security options from the parent to the new sb */
2294 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2295 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2296 return -ESTALE;
2297 return 0;
2298}
2299
fbdefd64
BS		 2300struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2301 struct nfs_server *server,
2302 int flags, const char *dev_name,
2303 struct nfs_mount_info *mount_info)
f7b422b1 2304{
f7b422b1 2305 struct super_block *s;
01194981 2306 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2307 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2308 struct nfs_sb_mountdata sb_mntdata = {
2309 .mntflags = flags,
c40f8d1d 2310 .server = server,
e89a5a43 2311 };
01194981 2312 int error;
33852a1f 2313
75180df2
TM		 2314 if (server->flags & NFS_MOUNT_UNSHARED)
2315 compare_super = NULL;
2316
fb2088cc
SP		 2317 /* -o noac implies -o sync */
2318 if (server->flags & NFS_MOUNT_NOAC)
2319 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2320
54ceac45 2321 /* Get a superblock - note that we may end up sharing one that already exists */
9249e17f 2322 s = sget(fs_type, compare_super, nfs_set_super, flags, &sb_mntdata);
816724e6 2323 if (IS_ERR(s)) {
01194981 2324 mntroot = ERR_CAST(s);
54ceac45 2325 goto out_err_nosb;
816724e6
TM		 2326 }
2327
54ceac45
DH		 2328 if (s->s_fs_info != server) {
2329 nfs_free_server(server);
2330 server = NULL;
fa799759
MS		 2331 } else {
2332 error = nfs_bdi_register(server);
01194981
AV		 2333 if (error) {
2334 mntroot = ERR_PTR(error);
cfbc0683 2335 goto error_splat_bdi;
01194981 2336 }
54ceac45 2337 }
f7b422b1 2338
54ceac45
DH		 2339 if (!s->s_root) {
2340 /* initial superblock/root creation */
c40f8d1d 2341 mount_info->fill_super(s, mount_info);
3d176e3f 2342 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2343 }
f7b422b1 2344
87c7083d 2345 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2346 if (IS_ERR(mntroot))
54ceac45 2347 goto error_splat_super;
816724e6 2348
3d176e3f 2349 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2350 if (error)
2351 goto error_splat_root;
2352
54ceac45 2353 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2354
2355out:
01194981 2356 return mntroot;
816724e6 2357
54ceac45
DH		 2358out_err_nosb:
2359 nfs_free_server(server);
0655960f 2360 goto out;
54ceac45 2361
f9c3a380
EP		 2362error_splat_root:
2363 dput(mntroot);
01194981 2364 mntroot = ERR_PTR(error);
54ceac45 2365error_splat_super:
cfbc0683
N		 2366 if (server && !s->s_root)
2367 bdi_unregister(&server->backing_dev_info);
2368error_splat_bdi:
6f5bbff9 2369 deactivate_locked_super(s);
0655960f 2370 goto out;
f7b422b1
DH		 2371}
2372
fbdefd64 2373struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
c40f8d1d
BS		 2374 int flags, const char *dev_name, void *raw_data)
2375{
c40f8d1d
BS		 2376 struct nfs_mount_info mount_info = {
2377 .fill_super = nfs_fill_super,
3d176e3f 2378 .set_security = nfs_set_sb_security,
c40f8d1d 2379 };
c40f8d1d
BS		 2380 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2381 int error;
2382
46058d46 2383 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2384 mount_info.mntfh = nfs_alloc_fhandle();
2385 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2386 goto out;
2387
2388 /* Validate the mount data */
87c7083d 2389 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2390 if (error == NFS_TEXT_DATA)
46058d46 2391 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2392 if (error < 0) {
2393 mntroot = ERR_PTR(error);
2394 goto out;
2395 }
c40f8d1d
BS		 2396
2397#ifdef CONFIG_NFS_V4
46058d46 2398 if (mount_info.parsed->version == 4)
87c7083d 2399 mntroot = nfs4_try_mount(flags, dev_name, &mount_info);
486aa699 2400 else
c40f8d1d 2401#endif /* CONFIG_NFS_V4 */
87c7083d 2402 mntroot = nfs_try_mount(flags, dev_name, &mount_info);
c40f8d1d 2403
c40f8d1d 2404out:
46058d46 2405 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2406 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2407 return mntroot;
2408}
2409
387c149b
TM		 2410/*
2411 * Ensure that we unregister the bdi before kill_anon_super
2412 * releases the device name
2413 */
fbdefd64 2414void nfs_put_super(struct super_block *s)
387c149b
TM		 2415{
2416 struct nfs_server *server = NFS_SB(s);
2417
2418 bdi_unregister(&server->backing_dev_info);
2419}
2420
54ceac45
DH		 2421/*
2422 * Destroy an NFS2/3 superblock
2423 */
fbdefd64 2424void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 2425{
2426 struct nfs_server *server = NFS_SB(s);
2427
2428 kill_anon_super(s);
08734048 2429 nfs_fscache_release_super_cookie(s);
54ceac45 2430 nfs_free_server(server);
f7b422b1
DH		 2431}
2432
54ceac45 2433/*
8c958e0c 2434 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2435 */
fbdefd64 2436struct dentry *
8c958e0c
BS		 2437nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2438 const char *dev_name, struct nfs_mount_info *mount_info)
f7b422b1 2439{
8c958e0c 2440 struct nfs_clone_mount *data = mount_info->cloned;
54ceac45 2441 struct nfs_server *server;
3d176e3f 2442 struct dentry *mntroot = ERR_PTR(-ENOMEM);
54ceac45 2443 int error;
f7b422b1 2444
8c958e0c 2445 dprintk("--> nfs_xdev_mount_common()\n");
f7b422b1 2446
87c7083d
BS		 2447 mount_info->mntfh = data->fh;
2448
54ceac45 2449 /* create a new volume representation */
7e6eb683 2450 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2451 if (IS_ERR(server)) {
2452 error = PTR_ERR(server);
3d176e3f 2453 goto out_err;
4c1fe2f7 2454 }
f7b422b1 2455
87c7083d 2456 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
8c958e0c 2457 dprintk("<-- nfs_xdev_mount_common() = 0\n");
3d176e3f 2458out:
31f43471 2459 return mntroot;
24c8dbbb 2460
3d176e3f 2461out_err:
8c958e0c 2462 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
3d176e3f 2463 goto out;
f7b422b1
DH		 2464}
2465
8c958e0c
BS		 2466/*
2467 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2468 */
2469static struct dentry *
2470nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2471 const char *dev_name, void *raw_data)
2472{
2473 struct nfs_mount_info mount_info = {
2474 .fill_super = nfs_clone_super,
3d176e3f 2475 .set_security = nfs_clone_sb_security,
8c958e0c
BS		 2476 .cloned = raw_data,
2477 };
2478 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2479}
2480
54ceac45
DH		 2481#ifdef CONFIG_NFS_V4
2482
01c3f052
TM		 2483static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2484{
5eebde23
SJ		 2485 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2486 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2487}
2488
f0768ebd
CL		 2489/*
2490 * Validate NFSv4 mount options
2491 */
91ea40b9
TT		 2492static int nfs4_validate_mount_data(void *options,
2493 struct nfs_parsed_mount_data *args,
2494 const char *dev_name)
f0768ebd 2495{
4cfd74fc 2496 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2497 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2498 char *c;
2499
2500 if (data == NULL)
2501 goto out_no_data;
2502
cdf66442
BS		 2503 args->version = 4;
2504
f0768ebd
CL		 2505 switch (data->version) {
2506 case 1:
4c568017
CL		 2507 if (data->host_addrlen > sizeof(args->nfs_server.address))
2508 goto out_no_address;
2509 if (data->host_addrlen == 0)
f0768ebd 2510 goto out_no_address;
4c568017 2511 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2512 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2513 return -EFAULT;
4cfd74fc 2514 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2515 goto out_no_address;
2516
6738b251
CL		 2517 if (data->auth_flavourlen) {
2518 if (data->auth_flavourlen > 1)
2519 goto out_inval_auth;
20c71f5e 2520 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2521 data->auth_flavours,
20c71f5e 2522 sizeof(args->auth_flavors[0])))
f0768ebd 2523 return -EFAULT;
f0768ebd
CL		 2524 }
2525
2526 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2527 if (IS_ERR(c))
2528 return PTR_ERR(c);
91ea40b9 2529 args->nfs_server.hostname = c;
f0768ebd
CL		 2530
2531 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2532 if (IS_ERR(c))
2533 return PTR_ERR(c);
91ea40b9
TT		 2534 args->nfs_server.export_path = c;
2535 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2536
2537 c = strndup_user(data->client_addr.data, 16);
2538 if (IS_ERR(c))
2539 return PTR_ERR(c);
91ea40b9
TT		 2540 args->client_address = c;
2541
2542 /*
2543 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2544 * can deal with.
2545 */
2546
2547 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2548 args->rsize = data->rsize;
2549 args->wsize = data->wsize;
2550 args->timeo = data->timeo;
2551 args->retrans = data->retrans;
2552 args->acregmin = data->acregmin;
2553 args->acregmax = data->acregmax;
2554 args->acdirmin = data->acdirmin;
2555 args->acdirmax = data->acdirmax;
2556 args->nfs_server.protocol = data->proto;
259875ef 2557 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2558
2559 break;
7630c852 2560 default:
b72e4f42 2561 return NFS_TEXT_DATA;
f0768ebd
CL		 2562 }
2563
2564 return 0;
2565
2566out_no_data:
2567 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2568 return -EINVAL;
2569
2570out_inval_auth:
2571 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2572 data->auth_flavourlen);
2573 return -EINVAL;
2574
2575out_no_address:
2576 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2577 return -EINVAL;
f0768ebd
CL		 2578}
2579
54ceac45 2580#endif /* CONFIG_NFS_V4 */
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