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xfs: check for race with xfs_reclaim_inode() in xfs_ifree_cluster()
[linux.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 <[email protected]>, 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 * [email protected]
13 *
14 * Split from inode.c by David Howells <[email protected]>
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>
5976687a 34#include <linux/sunrpc/addr.h>
f7b422b1
DH		 35#include <linux/sunrpc/stats.h>
36#include <linux/sunrpc/metrics.h>
0896a725 37#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 38#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 39#include <linux/nfs_fs.h>
40#include <linux/nfs_mount.h>
41#include <linux/nfs4_mount.h>
42#include <linux/lockd/bind.h>
f7b422b1
DH		 43#include <linux/seq_file.h>
44#include <linux/mount.h>
c02d7adf 45#include <linux/namei.h>
f7b422b1
DH		 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
7c0f6ba6 58#include <linux/uaccess.h>
f7b422b1
DH		 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"
76e697ba 66#include "nfs4session.h"
ae50c0b5 67#include "pnfs.h"
ab7017a3 68#include "nfs.h"
f7b422b1
DH		 69
70#define NFSDBG_FACILITY NFSDBG_VFS
b72e4f42 71#define NFS_TEXT_DATA 1
f7b422b1 72
1c606fb7 73#if IS_ENABLED(CONFIG_NFS_V3)
1e657bd5
PZ		 74#define NFS_DEFAULT_VERSION 3
75#else
76#define NFS_DEFAULT_VERSION 2
77#endif
78
bf0fd768
CL		 79enum {
80 /* Mount options that take no arguments */
81 Opt_soft, Opt_hard,
bf0fd768
CL		 82 Opt_posix, Opt_noposix,
83 Opt_cto, Opt_nocto,
84 Opt_ac, Opt_noac,
85 Opt_lock, Opt_nolock,
2cf7ff7a 86 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 87 Opt_acl, Opt_noacl,
88 Opt_rdirplus, Opt_nordirplus,
75180df2 89 Opt_sharecache, Opt_nosharecache,
d740351b 90 Opt_resvport, Opt_noresvport,
b797cac7 91 Opt_fscache, Opt_nofscache,
89652617 92 Opt_migration, Opt_nomigration,
bf0fd768
CL		 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,
e887cbcf 103 Opt_mountvers,
3fd5be9e 104 Opt_minorversion,
bf0fd768
CL		 105
106 /* Mount options that take string arguments */
0d71b058 107 Opt_nfsvers,
33832034 108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 109 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 110 Opt_lookupcache,
b797cac7 111 Opt_fscache_uniq,
5eebde23 112 Opt_local_lock,
bf0fd768 113
f45663ce
CL		 114 /* Special mount options */
115 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 116
117 Opt_err
118};
119
a447c093 120static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 121 { Opt_userspace, "bg" },
122 { Opt_userspace, "fg" },
ecbb3845
CL		 123 { Opt_userspace, "retry=%s" },
124
f45663ce
CL		 125 { Opt_sloppy, "sloppy" },
126
bf0fd768
CL		 127 { Opt_soft, "soft" },
128 { Opt_hard, "hard" },
d33e4dfe
CL		 129 { Opt_deprecated, "intr" },
130 { Opt_deprecated, "nointr" },
bf0fd768
CL		 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" },
bf0fd768
CL		 139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
2cf7ff7a 141 { Opt_rdma, "rdma" },
bf0fd768
CL		 142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
b797cac7 150 { Opt_fscache, "fsc" },
b797cac7 151 { Opt_nofscache, "nofsc" },
89652617
CL		 152 { Opt_migration, "migration" },
153 { Opt_nomigration, "nomigration" },
bf0fd768 154
a5a16bae
CL		 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" },
0d71b058
TM		 169 { Opt_minorversion, "minorversion=%s" },
170
a5a16bae
CL		 171 { Opt_nfsvers, "nfsvers=%s" },
172 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 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" },
33832034 179 { Opt_mounthost, "mounthost=%s" },
0ac83779 180 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 181
7973c1f1 182 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 183 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 184 { Opt_local_lock, "local_lock=%s" },
7973c1f1 185
3862279a
TM		 186 /* The following needs to be listed after all other options */
187 { Opt_nfsvers, "v%s" },
188
bf0fd768
CL		 189 { Opt_err, NULL }
190};
191
192enum {
ee671b01 193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
181342c5 194 Opt_xprt_rdma6,
bf0fd768
CL		 195
196 Opt_xprt_err
197};
198
a447c093 199static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 200 { Opt_xprt_udp, "udp" },
ee671b01 201 { Opt_xprt_udp6, "udp6" },
bf0fd768 202 { Opt_xprt_tcp, "tcp" },
ee671b01 203 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 204 { Opt_xprt_rdma, "rdma" },
181342c5 205 { Opt_xprt_rdma6, "rdma6" },
bf0fd768
CL		 206
207 { Opt_xprt_err, NULL }
208};
209
210enum {
211 Opt_sec_none, Opt_sec_sys,
212 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
213 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
214 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
215
216 Opt_sec_err
217};
218
a447c093 219static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 220 { Opt_sec_none, "none" },
221 { Opt_sec_none, "null" },
222 { Opt_sec_sys, "sys" },
223
224 { Opt_sec_krb5, "krb5" },
225 { Opt_sec_krb5i, "krb5i" },
226 { Opt_sec_krb5p, "krb5p" },
227
228 { Opt_sec_lkey, "lkey" },
229 { Opt_sec_lkeyi, "lkeyi" },
230 { Opt_sec_lkeyp, "lkeyp" },
231
8d042218
OK		 232 { Opt_sec_spkm, "spkm3" },
233 { Opt_sec_spkmi, "spkm3i" },
234 { Opt_sec_spkmp, "spkm3p" },
235
bf0fd768
CL		 236 { Opt_sec_err, NULL }
237};
238
7973c1f1
TM		 239enum {
240 Opt_lookupcache_all, Opt_lookupcache_positive,
241 Opt_lookupcache_none,
242
243 Opt_lookupcache_err
244};
245
246static match_table_t nfs_lookupcache_tokens = {
247 { Opt_lookupcache_all, "all" },
248 { Opt_lookupcache_positive, "pos" },
249 { Opt_lookupcache_positive, "positive" },
250 { Opt_lookupcache_none, "none" },
251
252 { Opt_lookupcache_err, NULL }
253};
254
5eebde23
SJ		 255enum {
256 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
257 Opt_local_lock_none,
258
259 Opt_local_lock_err
260};
261
262static match_table_t nfs_local_lock_tokens = {
263 { Opt_local_lock_all, "all" },
264 { Opt_local_lock_flock, "flock" },
265 { Opt_local_lock_posix, "posix" },
266 { Opt_local_lock_none, "none" },
267
268 { Opt_local_lock_err, NULL }
269};
270
0d71b058
TM		 271enum {
272 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
42c2c424 273 Opt_vers_4_1, Opt_vers_4_2,
0d71b058
TM		 274
275 Opt_vers_err
276};
277
278static match_table_t nfs_vers_tokens = {
279 { Opt_vers_2, "2" },
280 { Opt_vers_3, "3" },
281 { Opt_vers_4, "4" },
282 { Opt_vers_4_0, "4.0" },
283 { Opt_vers_4_1, "4.1" },
42c2c424 284 { Opt_vers_4_2, "4.2" },
0d71b058
TM		 285
286 { Opt_vers_err, NULL }
287};
bf0fd768 288
31f43471
AV		 289static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
290 int flags, const char *dev_name, void *raw_data);
f7b422b1 291
ab7017a3 292struct file_system_type nfs_fs_type = {
f7b422b1
DH		 293 .owner = THIS_MODULE,
294 .name = "nfs",
01194981 295 .mount = nfs_fs_mount,
f7b422b1 296 .kill_sb = nfs_kill_super,
ecf3d1f1 297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
f7b422b1 298};
7f78e035 299MODULE_ALIAS_FS("nfs");
ddda8e0a 300EXPORT_SYMBOL_GPL(nfs_fs_type);
f7b422b1 301
54ceac45 302struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 303 .owner = THIS_MODULE,
304 .name = "nfs",
31f43471 305 .mount = nfs_xdev_mount,
f7b422b1 306 .kill_sb = nfs_kill_super,
ecf3d1f1 307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 308};
309
6a74490d 310const struct super_operations nfs_sops = {
f7b422b1
DH		 311 .alloc_inode = nfs_alloc_inode,
312 .destroy_inode = nfs_destroy_inode,
313 .write_inode = nfs_write_inode,
eed99357 314 .drop_inode = nfs_drop_inode,
f7b422b1 315 .statfs = nfs_statfs,
b57922d9 316 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
c7f404b4
AV		 319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
f7b422b1 321 .show_stats = nfs_show_stats,
48b605f8 322 .remount_fs = nfs_remount,
f7b422b1 323};
ddda8e0a 324EXPORT_SYMBOL_GPL(nfs_sops);
f7b422b1 325
89d77c8f 326#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42 327static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
d72c727c
BS		 328static int nfs4_validate_mount_data(void *options,
329 struct nfs_parsed_mount_data *args, const char *dev_name);
1ae811ee 330
331struct file_system_type nfs4_fs_type = {
332 .owner = THIS_MODULE,
333 .name = "nfs4",
334 .mount = nfs_fs_mount,
335 .kill_sb = nfs_kill_super,
ecf3d1f1 336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1ae811ee 337};
7f78e035 338MODULE_ALIAS_FS("nfs4");
fa7614dd 339MODULE_ALIAS("nfs4");
1ae811ee 340EXPORT_SYMBOL_GPL(nfs4_fs_type);
341
342static int __init register_nfs4_fs(void)
343{
344 return register_filesystem(&nfs4_fs_type);
345}
346
347static void unregister_nfs4_fs(void)
348{
349 unregister_filesystem(&nfs4_fs_type);
350}
351#else
352static int __init register_nfs4_fs(void)
353{
354 return 0;
355}
356
357static void unregister_nfs4_fs(void)
358{
359}
f7b422b1
DH		 360#endif
361
8e1f936b 362static struct shrinker acl_shrinker = {
1ab6c499
DC		 363 .count_objects = nfs_access_cache_count,
364 .scan_objects = nfs_access_cache_scan,
8e1f936b
RR		 365 .seeks = DEFAULT_SEEKS,
366};
979df72e 367
f7b422b1
DH		 368/*
369 * Register the NFS filesystems
370 */
371int __init register_nfs_fs(void)
372{
373 int ret;
374
375 ret = register_filesystem(&nfs_fs_type);
376 if (ret < 0)
377 goto error_0;
378
1ae811ee 379 ret = register_nfs4_fs();
f7b422b1
DH		 380 if (ret < 0)
381 goto error_1;
1ae811ee 382
383 ret = nfs_register_sysctl();
384 if (ret < 0)
385 goto error_2;
5ef8d792
KM		 386 ret = register_shrinker(&acl_shrinker);
387 if (ret < 0)
388 goto error_3;
f7b422b1 389 return 0;
5ef8d792
KM		 390error_3:
391 nfs_unregister_sysctl();
1ae811ee 392error_2:
393 unregister_nfs4_fs();
f7b422b1
DH		 394error_1:
395 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 396error_0:
397 return ret;
398}
399
400/*
401 * Unregister the NFS filesystems
402 */
403void __exit unregister_nfs_fs(void)
404{
8e1f936b 405 unregister_shrinker(&acl_shrinker);
49af7ee1 406 nfs_unregister_sysctl();
1ae811ee 407 unregister_nfs4_fs();
f7b422b1
DH		 408 unregister_filesystem(&nfs_fs_type);
409}
410
ea7c38fe 411bool nfs_sb_active(struct super_block *sb)
ef818a28 412{
1daef0a8 413 struct nfs_server *server = NFS_SB(sb);
ef818a28 414
ea7c38fe
TM		 415 if (!atomic_inc_not_zero(&sb->s_active))
416 return false;
417 if (atomic_inc_return(&server->active) != 1)
418 atomic_dec(&sb->s_active);
419 return true;
ef818a28 420}
89d77c8f 421EXPORT_SYMBOL_GPL(nfs_sb_active);
ef818a28 422
1daef0a8 423void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 424{
425 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 426
427 if (atomic_dec_and_test(&server->active))
428 deactivate_super(sb);
ef818a28 429}
89d77c8f 430EXPORT_SYMBOL_GPL(nfs_sb_deactive);
ef818a28 431
f7b422b1
DH		 432/*
433 * Deliver file system statistics to userspace
434 */
fbdefd64 435int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 436{
0c7d90cf 437 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 438 unsigned char blockbits;
439 unsigned long blockres;
2b0143b5 440 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
ca7e9a0d
TM		 441 struct nfs_fsstat res;
442 int error = -ENOMEM;
443
444 res.fattr = nfs_alloc_fattr();
445 if (res.fattr == NULL)
446 goto out_err;
f7b422b1 447
8fa5c000 448 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 449 if (unlikely(error == -ESTALE)) {
450 struct dentry *pd_dentry;
451
452 pd_dentry = dget_parent(dentry);
453 if (pd_dentry != NULL) {
2b0143b5 454 nfs_zap_caches(d_inode(pd_dentry));
fbf3fdd2
MZ		 455 dput(pd_dentry);
456 }
457 }
ca7e9a0d 458 nfs_free_fattr(res.fattr);
f7b422b1
DH		 459 if (error < 0)
460 goto out_err;
ca7e9a0d 461
1a0ba9ae 462 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 463
464 /*
465 * Current versions of glibc do not correctly handle the
466 * case where f_frsize != f_bsize. Eventually we want to
467 * report the value of wtmult in this field.
468 */
0c7d90cf 469 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 470
471 /*
472 * On most *nix systems, f_blocks, f_bfree, and f_bavail
473 * are reported in units of f_frsize. Linux hasn't had
474 * an f_frsize field in its statfs struct until recently,
475 * thus historically Linux's sys_statfs reports these
476 * fields in units of f_bsize.
477 */
0c7d90cf
DH		 478 buf->f_bsize = dentry->d_sb->s_blocksize;
479 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 480 blockres = (1 << blockbits) - 1;
481 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
482 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
483 buf->f_bavail = (res.abytes + blockres) >> blockbits;
484
485 buf->f_files = res.tfiles;
486 buf->f_ffree = res.afiles;
487
488 buf->f_namelen = server->namelen;
1a0ba9ae 489
f7b422b1
DH		 490 return 0;
491
492 out_err:
3110ff80 493 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 494 return error;
f7b422b1 495}
89d77c8f 496EXPORT_SYMBOL_GPL(nfs_statfs);
f7b422b1 497
7d4e2747
DH		 498/*
499 * Map the security flavour number to a name
500 */
81039f1f
TM		 501static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
502{
7d4e2747 503 static const struct {
81039f1f
TM		 504 rpc_authflavor_t flavour;
505 const char *str;
4d4b69dd
WAA		 506 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
507 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
81039f1f
TM		 508 { RPC_AUTH_NULL, "null" },
509 { RPC_AUTH_UNIX, "sys" },
510 { RPC_AUTH_GSS_KRB5, "krb5" },
511 { RPC_AUTH_GSS_KRB5I, "krb5i" },
512 { RPC_AUTH_GSS_KRB5P, "krb5p" },
513 { RPC_AUTH_GSS_LKEY, "lkey" },
514 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
515 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
516 { RPC_AUTH_GSS_SPKM, "spkm" },
517 { RPC_AUTH_GSS_SPKMI, "spkmi" },
518 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 519 { UINT_MAX, "unknown" }
81039f1f
TM		 520 };
521 int i;
522
4d81cd16 523 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 524 if (sec_flavours[i].flavour == flavour)
525 break;
526 }
527 return sec_flavours[i].str;
528}
529
ee671b01
JL		 530static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
531 int showdefaults)
532{
533 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
6f6e3c09 534 char *proto = NULL;
ee671b01 535
ee671b01
JL		 536 switch (sap->sa_family) {
537 case AF_INET:
538 switch (nfss->mountd_protocol) {
539 case IPPROTO_UDP:
6f6e3c09 540 proto = RPCBIND_NETID_UDP;
ee671b01
JL		 541 break;
542 case IPPROTO_TCP:
6f6e3c09 543 proto = RPCBIND_NETID_TCP;
ee671b01 544 break;
ee671b01
JL		 545 }
546 break;
547 case AF_INET6:
548 switch (nfss->mountd_protocol) {
549 case IPPROTO_UDP:
6f6e3c09 550 proto = RPCBIND_NETID_UDP6;
ee671b01
JL		 551 break;
552 case IPPROTO_TCP:
6f6e3c09 553 proto = RPCBIND_NETID_TCP6;
ee671b01 554 break;
ee671b01
JL		 555 }
556 break;
ee671b01 557 }
6f6e3c09
N		 558 if (proto || showdefaults)
559 seq_printf(m, ",mountproto=%s", proto ?: "auto");
ee671b01
JL		 560}
561
82d101d5
CL		 562static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
563 int showdefaults)
564{
565 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
566
d5eff1a3
BS		 567 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
568 return;
569
82d101d5
CL		 570 switch (sap->sa_family) {
571 case AF_INET: {
572 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 573 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 574 break;
575 }
576 case AF_INET6: {
577 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 578 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 579 break;
580 }
581 default:
582 if (showdefaults)
583 seq_printf(m, ",mountaddr=unspecified");
584 }
585
586 if (nfss->mountd_version || showdefaults)
587 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 588 if ((nfss->mountd_port &&
589 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
590 showdefaults)
82d101d5
CL		 591 seq_printf(m, ",mountport=%u", nfss->mountd_port);
592
ee671b01 593 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 594}
595
89d77c8f 596#if IS_ENABLED(CONFIG_NFS_V4)
0be8189f
TM		 597static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
598 int showdefaults)
599{
600 struct nfs_client *clp = nfss->nfs_client;
601
602 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 603}
604#else
605static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
606 int showdefaults)
607{
608}
609#endif
610
7bbceb6f
TM		 611static void nfs_show_nfs_version(struct seq_file *m,
612 unsigned int version,
613 unsigned int minorversion)
614{
615 seq_printf(m, ",vers=%u", version);
616 if (version == 4)
617 seq_printf(m, ".%u", minorversion);
618}
619
f7b422b1
DH		 620/*
621 * Describe the mount options in force on this server representation
622 */
82d101d5
CL		 623static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
624 int showdefaults)
f7b422b1 625{
509de811 626 static const struct proc_nfs_info {
f7b422b1 627 int flag;
509de811
DH		 628 const char *str;
629 const char *nostr;
f7b422b1
DH		 630 } nfs_info[] = {
631 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 632 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 633 { NFS_MOUNT_NOCTO, ",nocto", "" },
634 { NFS_MOUNT_NOAC, ",noac", "" },
635 { NFS_MOUNT_NONLM, ",nolock", "" },
636 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 637 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 638 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
639 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 640 { 0, NULL, NULL }
641 };
509de811 642 const struct proc_nfs_info *nfs_infop;
8fa5c000 643 struct nfs_client *clp = nfss->nfs_client;
82d101d5 644 u32 version = clp->rpc_ops->version;
7c563cc9 645 int local_flock, local_fcntl;
f7b422b1 646
7bbceb6f 647 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 648 seq_printf(m, ",rsize=%u", nfss->rsize);
649 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 650 if (nfss->bsize != 0)
651 seq_printf(m, ",bsize=%u", nfss->bsize);
652 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 653 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 654 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 655 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 656 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 657 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 658 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 659 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 660 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 661 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
662 if (nfss->flags & nfs_infop->flag)
663 seq_puts(m, nfs_infop->str);
664 else
665 seq_puts(m, nfs_infop->nostr);
666 }
2446ab60 667 rcu_read_lock();
56928edd 668 seq_printf(m, ",proto=%s",
ee671b01 669 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 670 rcu_read_unlock();
82d101d5
CL		 671 if (version == 4) {
672 if (nfss->port != NFS_PORT)
673 seq_printf(m, ",port=%u", nfss->port);
674 } else
675 if (nfss->port)
676 seq_printf(m, ",port=%u", nfss->port);
677
33170233
TM		 678 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
679 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 680 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 681
682 if (version != 4)
683 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 684 else
685 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 686
b797cac7
DH		 687 if (nfss->options & NFS_OPTION_FSCACHE)
688 seq_printf(m, ",fsc");
9b00c643 689
89652617
CL		 690 if (nfss->options & NFS_OPTION_MIGRATION)
691 seq_printf(m, ",migration");
692
9b00c643
PL		 693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
695 seq_printf(m, ",lookupcache=none");
696 else
697 seq_printf(m, ",lookupcache=pos");
698 }
7c563cc9
SJ		 699
700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
702
703 if (!local_flock && !local_fcntl)
704 seq_printf(m, ",local_lock=none");
705 else if (local_flock && local_fcntl)
706 seq_printf(m, ",local_lock=all");
707 else if (local_flock)
708 seq_printf(m, ",local_lock=flock");
709 else
710 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 711}
712
713/*
714 * Describe the mount options on this VFS mountpoint
715 */
fbdefd64 716int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 717{
34c80b1d 718 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 719
720 nfs_show_mount_options(m, nfss, 0);
721
2446ab60 722 rcu_read_lock();
5d8515ca
CL		 723 seq_printf(m, ",addr=%s",
724 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
725 RPC_DISPLAY_ADDR));
2446ab60 726 rcu_read_unlock();
f7b422b1
DH		 727
728 return 0;
729}
89d77c8f 730EXPORT_SYMBOL_GPL(nfs_show_options);
45402c38 731
89d77c8f 732#if IS_ENABLED(CONFIG_NFS_V4)
ae50c0b5 733#ifdef CONFIG_NFS_V4_1
45402c38 734static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 735{
736 if (nfs4_has_session(server->nfs_client))
737 seq_printf(m, ",sessions");
738}
739#else
45402c38
HS		 740static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
741#endif
ae50c0b5
BF		 742#endif
743
744#ifdef CONFIG_NFS_V4_1
45402c38 745static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 746{
747 seq_printf(m, ",pnfs=");
748 if (server->pnfs_curr_ld)
749 seq_printf(m, "%s", server->pnfs_curr_ld->name);
750 else
751 seq_printf(m, "not configured");
752}
7e03b7cc
TM		 753
754static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
755{
59155546
CL		 756 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
757 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 758 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
759 "date='%llu,%u'",
760 impl_id->name, impl_id->domain,
761 impl_id->date.seconds, impl_id->date.nseconds);
762 }
763}
45402c38 764#else
89d77c8f 765#if IS_ENABLED(CONFIG_NFS_V4)
7e03b7cc
TM		 766static void show_pnfs(struct seq_file *m, struct nfs_server *server)
767{
768}
45402c38 769#endif
7e03b7cc
TM		 770static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
771{
772}
45402c38 773#endif
f7b422b1 774
fbdefd64 775int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 776{
777 char *page = (char *) __get_free_page(GFP_KERNEL);
778 char *devname, *dummy;
779 int err = 0;
780 if (!page)
781 return -ENOMEM;
97a54868 782 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
c7f404b4
AV		 783 if (IS_ERR(devname))
784 err = PTR_ERR(devname);
785 else
786 seq_escape(m, devname, " \t\n\\");
787 free_page((unsigned long)page);
788 return err;
789}
89d77c8f 790EXPORT_SYMBOL_GPL(nfs_show_devname);
c7f404b4 791
fbdefd64 792int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 793{
794 seq_puts(m, "/");
795 return 0;
796}
89d77c8f 797EXPORT_SYMBOL_GPL(nfs_show_path);
c7f404b4 798
f7b422b1
DH		 799/*
800 * Present statistical information for this VFS mountpoint
801 */
fbdefd64 802int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 803{
804 int i, cpu;
64132379 805 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 806 struct rpc_auth *auth = nfss->client->cl_auth;
807 struct nfs_iostats totals = { };
808
809 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
810
811 /*
812 * Display all mount option settings
813 */
814 seq_printf(m, "\n\topts:\t");
64132379
AV		 815 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
816 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
817 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
818 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 819 nfs_show_mount_options(m, nfss, 1);
820
821 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
822
7e03b7cc 823 show_implementation_id(m, nfss);
7d2ed9ac 824
f7b422b1
DH		 825 seq_printf(m, "\n\tcaps:\t");
826 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 827 seq_printf(m, ",wtmult=%u", nfss->wtmult);
828 seq_printf(m, ",dtsize=%u", nfss->dtsize);
829 seq_printf(m, ",bsize=%u", nfss->bsize);
830 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1 831
89d77c8f 832#if IS_ENABLED(CONFIG_NFS_V4)
40c55319 833 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 834 seq_printf(m, "\n\tnfsv4:\t");
835 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
836 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
a09df2ca 837 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
f7b422b1 838 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 839 show_sessions(m, nfss);
840 show_pnfs(m, nfss);
f7b422b1
DH		 841 }
842#endif
843
844 /*
845 * Display security flavor in effect for this mount
846 */
2d767432 847 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 848 if (auth->au_flavor)
2d767432 849 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 850
851 /*
852 * Display superblock I/O counters
853 */
854 for_each_possible_cpu(cpu) {
855 struct nfs_iostats *stats;
856
857 preempt_disable();
858 stats = per_cpu_ptr(nfss->io_stats, cpu);
859
860 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
861 totals.events[i] += stats->events[i];
862 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
863 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 864#ifdef CONFIG_NFS_FSCACHE
865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866 totals.fscache[i] += stats->fscache[i];
867#endif
f7b422b1
DH		 868
869 preempt_enable();
870 }
871
872 seq_printf(m, "\n\tevents:\t");
873 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
874 seq_printf(m, "%lu ", totals.events[i]);
875 seq_printf(m, "\n\tbytes:\t");
876 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
877 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 878#ifdef CONFIG_NFS_FSCACHE
879 if (nfss->options & NFS_OPTION_FSCACHE) {
880 seq_printf(m, "\n\tfsc:\t");
881 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
ce85bd29 882 seq_printf(m, "%Lu ", totals.fscache[i]);
6a51091d
DH		 883 }
884#endif
f7b422b1
DH		 885 seq_printf(m, "\n");
886
887 rpc_print_iostats(m, nfss->client);
888
889 return 0;
890}
89d77c8f 891EXPORT_SYMBOL_GPL(nfs_show_stats);
f7b422b1
DH		 892
893/*
894 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 895 * in response to xdev traversals and referrals
f7b422b1 896 */
fbdefd64 897void nfs_umount_begin(struct super_block *sb)
f7b422b1 898{
67e55205 899 struct nfs_server *server;
fc6ae3cf
TM		 900 struct rpc_clnt *rpc;
901
67e55205 902 server = NFS_SB(sb);
fc6ae3cf
TM		 903 /* -EIO all pending I/O */
904 rpc = server->client_acl;
905 if (!IS_ERR(rpc))
906 rpc_killall_tasks(rpc);
907 rpc = server->client;
908 if (!IS_ERR(rpc))
909 rpc_killall_tasks(rpc);
f7b422b1 910}
89d77c8f 911EXPORT_SYMBOL_GPL(nfs_umount_begin);
f7b422b1 912
db833351 913static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 914{
915 struct nfs_parsed_mount_data *data;
916
917 data = kzalloc(sizeof(*data), GFP_KERNEL);
918 if (data) {
a956beda
TM		 919 data->timeo = NFS_UNSPEC_TIMEO;
920 data->retrans = NFS_UNSPEC_RETRANS;
9423a08a
CL		 921 data->acregmin = NFS_DEF_ACREGMIN;
922 data->acregmax = NFS_DEF_ACREGMAX;
923 data->acdirmin = NFS_DEF_ACDIRMIN;
924 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 925 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 926 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 927 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
a3f73c27 928 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
9423a08a 929 data->minorversion = 0;
b72e4f42 930 data->need_mount = true;
9937347a 931 data->net = current->nsproxy->net_ns;
8a0d551a 932 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 933 }
934 return data;
935}
936
8a0d551a
JL		 937static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
938{
939 if (data) {
940 kfree(data->client_address);
941 kfree(data->mount_server.hostname);
942 kfree(data->nfs_server.export_path);
943 kfree(data->nfs_server.hostname);
944 kfree(data->fscache_uniq);
945 security_free_mnt_opts(&data->lsm_opts);
946 kfree(data);
947 }
948}
949
fc50d58f 950/*
cdcd7f9a
CL		 951 * Sanity-check a server address provided by the mount command.
952 *
953 * Address family must be initialized, and address must not be
954 * the ANY address for that family.
fc50d58f
CL		 955 */
956static int nfs_verify_server_address(struct sockaddr *addr)
957{
958 switch (addr->sa_family) {
959 case AF_INET: {
cdcd7f9a 960 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 961 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 962 }
963 case AF_INET6: {
964 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
965 return !ipv6_addr_any(sa);
fc50d58f
CL		 966 }
967 }
968
53a0b9c4 969 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 970 return 0;
971}
972
4cfd74fc
CL		 973/*
974 * Select between a default port value and a user-specified port value.
975 * If a zero value is set, then autobind will be used.
976 */
f5855fec 977static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 978 const unsigned short default_port)
979{
f5855fec
TM		 980 if (*port == NFS_UNSPEC_PORT)
981 *port = default_port;
4cfd74fc 982
f5855fec 983 rpc_set_port(sap, *port);
4cfd74fc
CL		 984}
985
259875ef
TM		 986/*
987 * Sanity check the NFS transport protocol.
988 *
989 */
990static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
991{
992 switch (mnt->nfs_server.protocol) {
993 case XPRT_TRANSPORT_UDP:
994 case XPRT_TRANSPORT_TCP:
995 case XPRT_TRANSPORT_RDMA:
996 break;
997 default:
998 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
999 }
1000}
1001
1002/*
1003 * For text based NFSv2/v3 mounts, the mount protocol transport default
1004 * settings should depend upon the specified NFS transport.
1005 */
1006static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1007{
1008 nfs_validate_transport_protocol(mnt);
1009
1010 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1011 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1012 return;
1013 switch (mnt->nfs_server.protocol) {
1014 case XPRT_TRANSPORT_UDP:
1015 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1016 break;
1017 case XPRT_TRANSPORT_TCP:
1018 case XPRT_TRANSPORT_RDMA:
1019 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1020 }
1021}
1022
4d4b69dd
WAA		 1023/*
1024 * Add 'flavor' to 'auth_info' if not already present.
1025 * Returns true if 'flavor' ends up in the list, false otherwise
1026 */
1027static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1028 rpc_authflavor_t flavor)
1029{
1030 unsigned int i;
00216026 1031 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
4d4b69dd
WAA		 1032
1033 /* make sure this flavor isn't already in the list */
1034 for (i = 0; i < auth_info->flavor_len; i++) {
1035 if (flavor == auth_info->flavors[i])
1036 return true;
1037 }
1038
1039 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1040 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1041 return false;
1042 }
1043
1044 auth_info->flavors[auth_info->flavor_len++] = flavor;
1045 return true;
1046}
1047
1048/*
1049 * Return true if 'match' is in auth_info or auth_info is empty.
1050 * Return false otherwise.
1051 */
1052bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1053 rpc_authflavor_t match)
1054{
1055 int i;
1056
1057 if (!auth_info->flavor_len)
1058 return true;
1059
1060 for (i = 0; i < auth_info->flavor_len; i++) {
1061 if (auth_info->flavors[i] == match)
1062 return true;
1063 }
1064 return false;
1065}
1066EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1067
01060c89
CL		 1068/*
1069 * Parse the value of the 'sec=' option.
01060c89
CL		 1070 */
1071static int nfs_parse_security_flavors(char *value,
1072 struct nfs_parsed_mount_data *mnt)
1073{
1074 substring_t args[MAX_OPT_ARGS];
19e7b8d2 1075 rpc_authflavor_t pseudoflavor;
4d4b69dd 1076 char *p;
01060c89
CL		 1077
1078 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1079
4d4b69dd
WAA		 1080 while ((p = strsep(&value, ":")) != NULL) {
1081 switch (match_token(p, nfs_secflavor_tokens, args)) {
1082 case Opt_sec_none:
1083 pseudoflavor = RPC_AUTH_NULL;
1084 break;
1085 case Opt_sec_sys:
1086 pseudoflavor = RPC_AUTH_UNIX;
1087 break;
1088 case Opt_sec_krb5:
1089 pseudoflavor = RPC_AUTH_GSS_KRB5;
1090 break;
1091 case Opt_sec_krb5i:
1092 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1093 break;
1094 case Opt_sec_krb5p:
1095 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1096 break;
1097 case Opt_sec_lkey:
1098 pseudoflavor = RPC_AUTH_GSS_LKEY;
1099 break;
1100 case Opt_sec_lkeyi:
1101 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1102 break;
1103 case Opt_sec_lkeyp:
1104 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1105 break;
1106 case Opt_sec_spkm:
1107 pseudoflavor = RPC_AUTH_GSS_SPKM;
1108 break;
1109 case Opt_sec_spkmi:
1110 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1111 break;
1112 case Opt_sec_spkmp:
1113 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1114 break;
1115 default:
1116 dfprintk(MOUNT,
1117 "NFS: sec= option '%s' not recognized\n", p);
1118 return 0;
1119 }
1120
1121 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1122 return 0;
01060c89
CL		 1123 }
1124
1125 return 1;
1126}
1127
0d71b058
TM		 1128static int nfs_parse_version_string(char *string,
1129 struct nfs_parsed_mount_data *mnt,
1130 substring_t *args)
1131{
1132 mnt->flags &= ~NFS_MOUNT_VER3;
1133 switch (match_token(string, nfs_vers_tokens, args)) {
1134 case Opt_vers_2:
1135 mnt->version = 2;
1136 break;
1137 case Opt_vers_3:
1138 mnt->flags |= NFS_MOUNT_VER3;
1139 mnt->version = 3;
1140 break;
1141 case Opt_vers_4:
1142 /* Backward compatibility option. In future,
1143 * the mount program should always supply
1144 * a NFSv4 minor version number.
1145 */
1146 mnt->version = 4;
1147 break;
1148 case Opt_vers_4_0:
1149 mnt->version = 4;
1150 mnt->minorversion = 0;
1151 break;
1152 case Opt_vers_4_1:
1153 mnt->version = 4;
1154 mnt->minorversion = 1;
1155 break;
42c2c424
SD		 1156 case Opt_vers_4_2:
1157 mnt->version = 4;
1158 mnt->minorversion = 2;
1159 break;
0d71b058
TM		 1160 default:
1161 return 0;
1162 }
1163 return 1;
1164}
1165
c5cb09b6
RL		 1166static int nfs_get_option_str(substring_t args[], char **option)
1167{
1168 kfree(*option);
1169 *option = match_strdup(args);
e25fbe38 1170 return !*option;
c5cb09b6
RL		 1171}
1172
1173static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1174{
1175 int rc;
1176 char *string;
1177
1178 string = match_strdup(args);
1179 if (string == NULL)
1180 return -ENOMEM;
7297cb68 1181 rc = kstrtoul(string, 10, option);
c5cb09b6
RL		 1182 kfree(string);
1183
1184 return rc;
1185}
1186
a956beda
TM		 1187static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
1188 unsigned long l_bound, unsigned long u_bound)
1189{
1190 int ret;
1191
1192 ret = nfs_get_option_ul(args, option);
1193 if (ret != 0)
1194 return ret;
1195 if (*option < l_bound || *option > u_bound)
1196 return -ERANGE;
1197 return 0;
1198}
1199
bf0fd768
CL		 1200/*
1201 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1202 * a data structure. The whole mount string is processed; bad options are
1203 * skipped as they are encountered. If there were no errors, return 1;
1204 * otherwise return 0 (zero).
bf0fd768
CL		 1205 */
1206static int nfs_parse_mount_options(char *raw,
1207 struct nfs_parsed_mount_data *mnt)
1208{
f9c3a380 1209 char *p, *string, *secdata;
d23c45fd 1210 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1211 unsigned short protofamily = AF_UNSPEC;
1212 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1213
1214 if (!raw) {
1215 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1216 return 1;
1217 }
1218 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1219
f9c3a380
EP		 1220 secdata = alloc_secdata();
1221 if (!secdata)
1222 goto out_nomem;
1223
1224 rc = security_sb_copy_data(raw, secdata);
1225 if (rc)
1226 goto out_security_failure;
1227
1228 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1229 if (rc)
1230 goto out_security_failure;
1231
1232 free_secdata(secdata);
1233
bf0fd768
CL		 1234 while ((p = strsep(&raw, ",")) != NULL) {
1235 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1236 unsigned long option;
1237 int token;
bf0fd768
CL		 1238
1239 if (!*p)
1240 continue;
1241
1242 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1243
1244 token = match_token(p, nfs_mount_option_tokens, args);
1245 switch (token) {
f45663ce
CL		 1246
1247 /*
1248 * boolean options: foo/nofoo
1249 */
bf0fd768
CL		 1250 case Opt_soft:
1251 mnt->flags |= NFS_MOUNT_SOFT;
1252 break;
1253 case Opt_hard:
1254 mnt->flags &= ~NFS_MOUNT_SOFT;
1255 break;
bf0fd768
CL		 1256 case Opt_posix:
1257 mnt->flags |= NFS_MOUNT_POSIX;
1258 break;
1259 case Opt_noposix:
1260 mnt->flags &= ~NFS_MOUNT_POSIX;
1261 break;
1262 case Opt_cto:
1263 mnt->flags &= ~NFS_MOUNT_NOCTO;
1264 break;
1265 case Opt_nocto:
1266 mnt->flags |= NFS_MOUNT_NOCTO;
1267 break;
1268 case Opt_ac:
1269 mnt->flags &= ~NFS_MOUNT_NOAC;
1270 break;
1271 case Opt_noac:
1272 mnt->flags |= NFS_MOUNT_NOAC;
1273 break;
1274 case Opt_lock:
1275 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1276 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1277 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1278 break;
1279 case Opt_nolock:
1280 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1281 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1282 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1283 break;
bf0fd768
CL		 1284 case Opt_udp:
1285 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1286 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1287 break;
1288 case Opt_tcp:
1289 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1290 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1291 break;
2cf7ff7a
TT		 1292 case Opt_rdma:
1293 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1294 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1295 xprt_load_transport(p);
2cf7ff7a 1296 break;
bf0fd768
CL		 1297 case Opt_acl:
1298 mnt->flags &= ~NFS_MOUNT_NOACL;
1299 break;
1300 case Opt_noacl:
1301 mnt->flags |= NFS_MOUNT_NOACL;
1302 break;
1303 case Opt_rdirplus:
1304 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1305 break;
1306 case Opt_nordirplus:
1307 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1308 break;
75180df2
TM		 1309 case Opt_sharecache:
1310 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1311 break;
1312 case Opt_nosharecache:
1313 mnt->flags |= NFS_MOUNT_UNSHARED;
1314 break;
d740351b
CL		 1315 case Opt_resvport:
1316 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1317 break;
1318 case Opt_noresvport:
1319 mnt->flags |= NFS_MOUNT_NORESVPORT;
1320 break;
b797cac7
DH		 1321 case Opt_fscache:
1322 mnt->options |= NFS_OPTION_FSCACHE;
1323 kfree(mnt->fscache_uniq);
1324 mnt->fscache_uniq = NULL;
1325 break;
1326 case Opt_nofscache:
1327 mnt->options &= ~NFS_OPTION_FSCACHE;
1328 kfree(mnt->fscache_uniq);
1329 mnt->fscache_uniq = NULL;
1330 break;
89652617
CL		 1331 case Opt_migration:
1332 mnt->options |= NFS_OPTION_MIGRATION;
1333 break;
1334 case Opt_nomigration:
1335 mnt->options &= NFS_OPTION_MIGRATION;
1336 break;
bf0fd768 1337
f45663ce
CL		 1338 /*
1339 * options that take numeric values
1340 */
bf0fd768 1341 case Opt_port:
c5cb09b6
RL		 1342 if (nfs_get_option_ul(args, &option) ||
1343 option > USHRT_MAX)
d23c45fd
CL		 1344 goto out_invalid_value;
1345 mnt->nfs_server.port = option;
bf0fd768
CL		 1346 break;
1347 case Opt_rsize:
c5cb09b6 1348 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1349 goto out_invalid_value;
1350 mnt->rsize = option;
bf0fd768
CL		 1351 break;
1352 case Opt_wsize:
c5cb09b6 1353 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1354 goto out_invalid_value;
1355 mnt->wsize = option;
bf0fd768
CL		 1356 break;
1357 case Opt_bsize:
c5cb09b6 1358 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1359 goto out_invalid_value;
1360 mnt->bsize = option;
bf0fd768
CL		 1361 break;
1362 case Opt_timeo:
a956beda 1363 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
d23c45fd
CL		 1364 goto out_invalid_value;
1365 mnt->timeo = option;
bf0fd768
CL		 1366 break;
1367 case Opt_retrans:
a956beda 1368 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
d23c45fd
CL		 1369 goto out_invalid_value;
1370 mnt->retrans = option;
bf0fd768
CL		 1371 break;
1372 case Opt_acregmin:
c5cb09b6 1373 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1374 goto out_invalid_value;
1375 mnt->acregmin = option;
bf0fd768
CL		 1376 break;
1377 case Opt_acregmax:
c5cb09b6 1378 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1379 goto out_invalid_value;
1380 mnt->acregmax = option;
bf0fd768
CL		 1381 break;
1382 case Opt_acdirmin:
c5cb09b6 1383 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1384 goto out_invalid_value;
1385 mnt->acdirmin = option;
bf0fd768
CL		 1386 break;
1387 case Opt_acdirmax:
c5cb09b6 1388 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1389 goto out_invalid_value;
1390 mnt->acdirmax = option;
bf0fd768
CL		 1391 break;
1392 case Opt_actimeo:
c5cb09b6 1393 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1394 goto out_invalid_value;
1395 mnt->acregmin = mnt->acregmax =
1396 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1397 break;
1398 case Opt_namelen:
c5cb09b6 1399 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1400 goto out_invalid_value;
1401 mnt->namlen = option;
bf0fd768
CL		 1402 break;
1403 case Opt_mountport:
c5cb09b6
RL		 1404 if (nfs_get_option_ul(args, &option) ||
1405 option > USHRT_MAX)
d23c45fd
CL		 1406 goto out_invalid_value;
1407 mnt->mount_server.port = option;
bf0fd768 1408 break;
bf0fd768 1409 case Opt_mountvers:
c5cb09b6 1410 if (nfs_get_option_ul(args, &option) ||
f45663ce 1411 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1412 option > NFS_MNT3_VERSION)
1413 goto out_invalid_value;
1414 mnt->mount_server.version = option;
bf0fd768 1415 break;
3fd5be9e 1416 case Opt_minorversion:
c5cb09b6 1417 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1418 goto out_invalid_value;
1419 if (option > NFS4_MAX_MINOR_VERSION)
1420 goto out_invalid_value;
1421 mnt->minorversion = option;
3fd5be9e 1422 break;
bf0fd768 1423
f45663ce
CL		 1424 /*
1425 * options that take text values
1426 */
0d71b058
TM		 1427 case Opt_nfsvers:
1428 string = match_strdup(args);
1429 if (string == NULL)
1430 goto out_nomem;
1431 rc = nfs_parse_version_string(string, mnt, args);
1432 kfree(string);
1433 if (!rc)
1434 goto out_invalid_value;
1435 break;
bf0fd768
CL		 1436 case Opt_sec:
1437 string = match_strdup(args);
1438 if (string == NULL)
1439 goto out_nomem;
01060c89 1440 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1441 kfree(string);
f45663ce 1442 if (!rc) {
f45663ce
CL		 1443 dfprintk(MOUNT, "NFS: unrecognized "
1444 "security flavor\n");
d23c45fd 1445 return 0;
f45663ce 1446 }
bf0fd768
CL		 1447 break;
1448 case Opt_proto:
1449 string = match_strdup(args);
1450 if (string == NULL)
1451 goto out_nomem;
1452 token = match_token(string,
1453 nfs_xprt_protocol_tokens, args);
bf0fd768 1454
ee671b01 1455 protofamily = AF_INET;
bf0fd768 1456 switch (token) {
ee671b01
JL		 1457 case Opt_xprt_udp6:
1458 protofamily = AF_INET6;
fdb66ff4 1459 case Opt_xprt_udp:
bf0fd768 1460 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1461 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1462 break;
ee671b01
JL		 1463 case Opt_xprt_tcp6:
1464 protofamily = AF_INET6;
fdb66ff4 1465 case Opt_xprt_tcp:
bf0fd768 1466 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1467 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1468 break;
181342c5
SM		 1469 case Opt_xprt_rdma6:
1470 protofamily = AF_INET6;
2cf7ff7a
TT		 1471 case Opt_xprt_rdma:
1472 /* vector side protocols to TCP */
1473 mnt->flags |= NFS_MOUNT_TCP;
1474 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1475 xprt_load_transport(string);
2cf7ff7a 1476 break;
bf0fd768 1477 default:
f45663ce
CL		 1478 dfprintk(MOUNT, "NFS: unrecognized "
1479 "transport protocol\n");
4223a4a1 1480 kfree(string);
d23c45fd 1481 return 0;
bf0fd768 1482 }
c5cb09b6 1483 kfree(string);
bf0fd768
CL		 1484 break;
1485 case Opt_mountproto:
1486 string = match_strdup(args);
1487 if (string == NULL)
1488 goto out_nomem;
1489 token = match_token(string,
1490 nfs_xprt_protocol_tokens, args);
d508afb4 1491 kfree(string);
bf0fd768 1492
ee671b01 1493 mountfamily = AF_INET;
bf0fd768 1494 switch (token) {
ee671b01
JL		 1495 case Opt_xprt_udp6:
1496 mountfamily = AF_INET6;
fdb66ff4 1497 case Opt_xprt_udp:
0896a725 1498 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1499 break;
ee671b01
JL		 1500 case Opt_xprt_tcp6:
1501 mountfamily = AF_INET6;
fdb66ff4 1502 case Opt_xprt_tcp:
0896a725 1503 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1504 break;
2cf7ff7a 1505 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1506 default:
f45663ce
CL		 1507 dfprintk(MOUNT, "NFS: unrecognized "
1508 "transport protocol\n");
d23c45fd 1509 return 0;
bf0fd768
CL		 1510 }
1511 break;
1512 case Opt_addr:
1513 string = match_strdup(args);
1514 if (string == NULL)
1515 goto out_nomem;
53a0b9c4 1516 mnt->nfs_server.addrlen =
b48e1278 1517 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1518 (struct sockaddr *)
1519 &mnt->nfs_server.address,
1520 sizeof(mnt->nfs_server.address));
bf0fd768 1521 kfree(string);
53a0b9c4
CL		 1522 if (mnt->nfs_server.addrlen == 0)
1523 goto out_invalid_address;
bf0fd768
CL		 1524 break;
1525 case Opt_clientaddr:
c5cb09b6 1526 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1527 goto out_nomem;
bf0fd768 1528 break;
33832034 1529 case Opt_mounthost:
c5cb09b6
RL		 1530 if (nfs_get_option_str(args,
1531 &mnt->mount_server.hostname))
33832034 1532 goto out_nomem;
33832034 1533 break;
0ac83779 1534 case Opt_mountaddr:
bf0fd768
CL		 1535 string = match_strdup(args);
1536 if (string == NULL)
1537 goto out_nomem;
53a0b9c4 1538 mnt->mount_server.addrlen =
b48e1278 1539 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1540 (struct sockaddr *)
1541 &mnt->mount_server.address,
1542 sizeof(mnt->mount_server.address));
bf0fd768 1543 kfree(string);
53a0b9c4
CL		 1544 if (mnt->mount_server.addrlen == 0)
1545 goto out_invalid_address;
bf0fd768 1546 break;
7973c1f1
TM		 1547 case Opt_lookupcache:
1548 string = match_strdup(args);
1549 if (string == NULL)
1550 goto out_nomem;
1551 token = match_token(string,
1552 nfs_lookupcache_tokens, args);
1553 kfree(string);
1554 switch (token) {
1555 case Opt_lookupcache_all:
1556 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1557 break;
1558 case Opt_lookupcache_positive:
1559 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1560 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1561 break;
1562 case Opt_lookupcache_none:
1563 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1564 break;
1565 default:
7973c1f1
TM		 1566 dfprintk(MOUNT, "NFS: invalid "
1567 "lookupcache argument\n");
d23c45fd 1568 return 0;
7973c1f1
TM		 1569 };
1570 break;
a6d5ff64 1571 case Opt_fscache_uniq:
c5cb09b6 1572 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1573 goto out_nomem;
a6d5ff64
CL		 1574 mnt->options |= NFS_OPTION_FSCACHE;
1575 break;
5eebde23
SJ		 1576 case Opt_local_lock:
1577 string = match_strdup(args);
1578 if (string == NULL)
1579 goto out_nomem;
1580 token = match_token(string, nfs_local_lock_tokens,
1581 args);
1582 kfree(string);
1583 switch (token) {
1584 case Opt_local_lock_all:
1585 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1586 NFS_MOUNT_LOCAL_FCNTL);
1587 break;
1588 case Opt_local_lock_flock:
1589 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1590 break;
1591 case Opt_local_lock_posix:
1592 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1593 break;
1594 case Opt_local_lock_none:
1595 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1596 NFS_MOUNT_LOCAL_FCNTL);
1597 break;
1598 default:
1599 dfprintk(MOUNT, "NFS: invalid "
1600 "local_lock argument\n");
1601 return 0;
1602 };
1603 break;
bf0fd768 1604
f45663ce
CL		 1605 /*
1606 * Special options
1607 */
1608 case Opt_sloppy:
1609 sloppy = 1;
1610 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1611 break;
bf0fd768
CL		 1612 case Opt_userspace:
1613 case Opt_deprecated:
d33e4dfe
CL		 1614 dfprintk(MOUNT, "NFS: ignoring mount option "
1615 "'%s'\n", p);
bf0fd768
CL		 1616 break;
1617
1618 default:
d23c45fd 1619 invalid_option = 1;
f45663ce
CL		 1620 dfprintk(MOUNT, "NFS: unrecognized mount option "
1621 "'%s'\n", p);
bf0fd768
CL		 1622 }
1623 }
1624
d23c45fd
CL		 1625 if (!sloppy && invalid_option)
1626 return 0;
1627
571b7554
WAA		 1628 if (mnt->minorversion && mnt->version != 4)
1629 goto out_minorversion_mismatch;
1630
89652617 1631 if (mnt->options & NFS_OPTION_MIGRATION &&
9e08ef1a 1632 (mnt->version != 4 || mnt->minorversion != 0))
89652617
CL		 1633 goto out_migration_misuse;
1634
ee671b01
JL		 1635 /*
1636 * verify that any proto=/mountproto= options match the address
1856b225 1637 * families in the addr=/mountaddr= options.
ee671b01
JL		 1638 */
1639 if (protofamily != AF_UNSPEC &&
1640 protofamily != mnt->nfs_server.address.ss_family)
1641 goto out_proto_mismatch;
1642
1643 if (mountfamily != AF_UNSPEC) {
1644 if (mnt->mount_server.addrlen) {
1645 if (mountfamily != mnt->mount_server.address.ss_family)
1646 goto out_mountproto_mismatch;
1647 } else {
1648 if (mountfamily != mnt->nfs_server.address.ss_family)
1649 goto out_mountproto_mismatch;
1650 }
1651 }
1652
bf0fd768
CL		 1653 return 1;
1654
ee671b01
JL		 1655out_mountproto_mismatch:
1656 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1657 "option\n");
1658 return 0;
1659out_proto_mismatch:
1660 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1661 return 0;
53a0b9c4
CL		 1662out_invalid_address:
1663 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1664 return 0;
d23c45fd 1665out_invalid_value:
53a0b9c4 1666 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1667 return 0;
571b7554
WAA		 1668out_minorversion_mismatch:
1669 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1670 "minorversion=%u\n", mnt->version, mnt->minorversion);
1671 return 0;
89652617
CL		 1672out_migration_misuse:
1673 printk(KERN_INFO
1674 "NFS: 'migration' not supported for this NFS version\n");
1675 return 0;
bf0fd768
CL		 1676out_nomem:
1677 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1678 return 0;
f9c3a380
EP		 1679out_security_failure:
1680 free_secdata(secdata);
1681 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1682 return 0;
bf0fd768
CL		 1683}
1684
ec88f28d 1685/*
4d4b69dd
WAA		 1686 * Ensure that a specified authtype in args->auth_info is supported by
1687 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1688 * -EACCES if not.
ec88f28d 1689 */
4d4b69dd 1690static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
9111c95b 1691 rpc_authflavor_t *server_authlist, unsigned int count)
ec88f28d 1692{
4d4b69dd 1693 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9111c95b 1694 unsigned int i;
e68fd7c8 1695 int use_auth_null = false;
4580a92d 1696
d497ab97
WAA		 1697 /*
1698 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1699 * must be in the list returned by the server.
1700 *
1701 * AUTH_NULL has a special meaning when it's in the server list - it
1702 * means that the server will ignore the rpc creds, so any flavor
e68fd7c8 1703 * can be used but still use the sec= that was specified.
d497ab97 1704 */
4580a92d 1705 for (i = 0; i < count; i++) {
4d4b69dd
WAA		 1706 flavor = server_authlist[i];
1707
e68fd7c8 1708 if (nfs_auth_info_match(&args->auth_info, flavor))
9111c95b 1709 goto out;
e68fd7c8
SD		 1710
1711 if (flavor == RPC_AUTH_NULL)
1712 use_auth_null = true;
1713 }
1714
1715 if (use_auth_null) {
1716 flavor = RPC_AUTH_NULL;
1717 goto out;
4580a92d 1718 }
ec88f28d 1719
4d4b69dd
WAA		 1720 dfprintk(MOUNT,
1721 "NFS: specified auth flavors not supported by server\n");
9111c95b 1722 return -EACCES;
d497ab97 1723
4580a92d 1724out:
4d4b69dd 1725 args->selected_flavor = flavor;
a3f73c27 1726 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
d497ab97 1727 return 0;
ec88f28d
CL		 1728}
1729
0076d7b7
CL		 1730/*
1731 * Use the remote server's MOUNT service to request the NFS file handle
1732 * corresponding to the provided path.
1733 */
486aa699 1734static int nfs_request_mount(struct nfs_parsed_mount_data *args,
294ae81d
JL		 1735 struct nfs_fh *root_fh,
1736 rpc_authflavor_t *server_authlist,
1737 unsigned int *server_authlist_len)
0076d7b7 1738{
c5d120f8
CL		 1739 struct nfs_mount_request request = {
1740 .sap = (struct sockaddr *)
1741 &args->mount_server.address,
1742 .dirpath = args->nfs_server.export_path,
1743 .protocol = args->mount_server.protocol,
1744 .fh = root_fh,
50a737f8 1745 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
294ae81d 1746 .auth_flav_len = server_authlist_len,
ec88f28d 1747 .auth_flavs = server_authlist,
6d59b8d5 1748 .net = args->net,
c5d120f8 1749 };
4c568017 1750 int status;
0076d7b7
CL		 1751
1752 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1753 switch (args->version) {
1754 default:
1755 args->mount_server.version = NFS_MNT3_VERSION;
1756 break;
1757 case 2:
1758 args->mount_server.version = NFS_MNT_VERSION;
1759 }
0076d7b7 1760 }
c5d120f8 1761 request.version = args->mount_server.version;
0076d7b7 1762
33832034 1763 if (args->mount_server.hostname)
c5d120f8 1764 request.hostname = args->mount_server.hostname;
33832034 1765 else
c5d120f8 1766 request.hostname = args->nfs_server.hostname;
33832034 1767
0076d7b7
CL		 1768 /*
1769 * Construct the mount server's address.
1770 */
4c568017 1771 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1772 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1773 args->nfs_server.addrlen);
1774 args->mount_server.addrlen = args->nfs_server.addrlen;
1775 }
c5d120f8 1776 request.salen = args->mount_server.addrlen;
f5855fec 1777 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1778
1779 /*
1780 * Now ask the mount server to map our export path
1781 * to a file handle.
1782 */
c5d120f8 1783 status = nfs_mount(&request);
ec88f28d
CL		 1784 if (status != 0) {
1785 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1786 request.hostname, status);
1787 return status;
1788 }
0076d7b7 1789
9111c95b 1790 return 0;
0076d7b7
CL		 1791}
1792
d17540c6
JL		 1793static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1794 struct nfs_subversion *nfs_mod)
1795{
1796 int status;
9111c95b
JL		 1797 unsigned int i;
1798 bool tried_auth_unix = false;
1799 bool auth_null_in_list = false;
1800 struct nfs_server *server = ERR_PTR(-EACCES);
294ae81d
JL		 1801 struct nfs_parsed_mount_data *args = mount_info->parsed;
1802 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1803 unsigned int authlist_len = ARRAY_SIZE(authlist);
d17540c6 1804
294ae81d
JL		 1805 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1806 &authlist_len);
d17540c6
JL		 1807 if (status)
1808 return ERR_PTR(status);
1809
9111c95b
JL		 1810 /*
1811 * Was a sec= authflavor specified in the options? First, verify
1812 * whether the server supports it, and then just try to use it if so.
1813 */
a3f73c27 1814 if (args->auth_info.flavor_len > 0) {
4d4b69dd 1815 status = nfs_verify_authflavors(args, authlist, authlist_len);
a3f73c27
WAA		 1816 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1817 args->selected_flavor);
9111c95b
JL		 1818 if (status)
1819 return ERR_PTR(status);
1820 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1821 }
1822
1823 /*
1824 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1825 * SHOULD prefer the flavor listed first. However, some servers list
1826 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1827 */
1828 for (i = 0; i < authlist_len; ++i) {
1829 rpc_authflavor_t flavor;
1830 struct rpcsec_gss_info info;
1831
1832 flavor = authlist[i];
1833 switch (flavor) {
1834 case RPC_AUTH_UNIX:
1835 tried_auth_unix = true;
1836 break;
1837 case RPC_AUTH_NULL:
1838 auth_null_in_list = true;
1839 continue;
1840 default:
1841 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1842 continue;
1843 /* Fallthrough */
1844 }
1845 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
a3f73c27 1846 args->selected_flavor = flavor;
9111c95b
JL		 1847 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1848 if (!IS_ERR(server))
1849 return server;
1850 }
1851
1852 /*
1853 * Nothing we tried so far worked. At this point, give up if we've
1854 * already tried AUTH_UNIX or if the server's list doesn't contain
1855 * AUTH_NULL
1856 */
1857 if (tried_auth_unix || !auth_null_in_list)
1858 return server;
1859
1860 /* Last chance! Try AUTH_UNIX */
1861 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
a3f73c27 1862 args->selected_flavor = RPC_AUTH_UNIX;
d17540c6
JL		 1863 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1864}
1865
ff9099f2
BS		 1866struct dentry *nfs_try_mount(int flags, const char *dev_name,
1867 struct nfs_mount_info *mount_info,
1868 struct nfs_subversion *nfs_mod)
486aa699 1869{
486aa699
BS		 1870 struct nfs_server *server;
1871
d17540c6
JL		 1872 if (mount_info->parsed->need_mount)
1873 server = nfs_try_mount_request(mount_info, nfs_mod);
1874 else
1875 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
486aa699 1876
486aa699
BS		 1877 if (IS_ERR(server))
1878 return ERR_CAST(server);
1879
ab7017a3 1880 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
486aa699 1881}
ddda8e0a 1882EXPORT_SYMBOL_GPL(nfs_try_mount);
486aa699 1883
c12bacec
RL		 1884/*
1885 * Split "dev_name" into "hostname:export_path".
1886 *
1887 * The leftmost colon demarks the split between the server's hostname
1888 * and the export path. If the hostname starts with a left square
1889 * bracket, then it may contain colons.
1890 *
1891 * Note: caller frees hostname and export path, even on error.
1892 */
1893static int nfs_parse_devname(const char *dev_name,
1894 char **hostname, size_t maxnamlen,
1895 char **export_path, size_t maxpathlen)
dc045898
CL		 1896{
1897 size_t len;
c12bacec 1898 char *end;
dc045898 1899
c12bacec
RL		 1900 /* Is the host name protected with square brakcets? */
1901 if (*dev_name == '[') {
1902 end = strchr(++dev_name, ']');
1903 if (end == NULL || end[1] != ':')
dc045898 1904 goto out_bad_devname;
dc045898 1905
c12bacec
RL		 1906 len = end - dev_name;
1907 end++;
1908 } else {
1909 char *comma;
dc045898 1910
c12bacec
RL		 1911 end = strchr(dev_name, ':');
1912 if (end == NULL)
1913 goto out_bad_devname;
1914 len = end - dev_name;
d1aa0825 1915
c12bacec
RL		 1916 /* kill possible hostname list: not supported */
1917 comma = strchr(dev_name, ',');
1918 if (comma != NULL && comma < end)
1919 *comma = 0;
1920 }
d1aa0825 1921
d1aa0825
CL		 1922 if (len > maxnamlen)
1923 goto out_hostname;
1924
1925 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1926 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1927 if (*hostname == NULL)
1928 goto out_nomem;
c12bacec 1929 len = strlen(++end);
d1aa0825
CL		 1930 if (len > maxpathlen)
1931 goto out_path;
1932 *export_path = kstrndup(end, len, GFP_KERNEL);
1933 if (!*export_path)
1934 goto out_nomem;
1935
c12bacec 1936 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1937 return 0;
1938
1939out_bad_devname:
1940 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1941 return -EINVAL;
1942
1943out_nomem:
1944 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1945 return -ENOMEM;
1946
1947out_hostname:
1948 dfprintk(MOUNT, "NFS: server hostname too long\n");
1949 return -ENAMETOOLONG;
1950
1951out_path:
1952 dfprintk(MOUNT, "NFS: export pathname too long\n");
1953 return -ENAMETOOLONG;
1954}
1955
f7b422b1 1956/*
54ceac45
DH		 1957 * Validate the NFS2/NFS3 mount data
1958 * - fills in the mount root filehandle
136d558c
CL		 1959 *
1960 * For option strings, user space handles the following behaviors:
1961 *
1962 * + DNS: mapping server host name to IP address ("addr=" option)
1963 *
1964 * + failure mode: how to behave if a mount request can't be handled
1965 * immediately ("fg/bg" option)
1966 *
1967 * + retry: how often to retry a mount request ("retry=" option)
1968 *
1969 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1970 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1971 */
d72c727c
BS		 1972static int nfs23_validate_mount_data(void *options,
1973 struct nfs_parsed_mount_data *args,
1974 struct nfs_fh *mntfh,
1975 const char *dev_name)
f7b422b1 1976{
2283f8d6 1977 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1978 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
74c98811 1979 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
136d558c 1980
5df36e78
CL		 1981 if (data == NULL)
1982 goto out_no_data;
f7b422b1 1983
c5afc8da 1984 args->version = NFS_DEFAULT_VERSION;
54ceac45 1985 switch (data->version) {
5df36e78
CL		 1986 case 1:
1987 data->namlen = 0;
1988 case 2:
1989 data->bsize = 0;
1990 case 3:
1991 if (data->flags & NFS_MOUNT_VER3)
1992 goto out_no_v3;
1993 data->root.size = NFS2_FHSIZE;
1994 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
74c98811
TM		 1995 /* Turn off security negotiation */
1996 extra_flags |= NFS_MOUNT_SECFLAVOUR;
5df36e78
CL		 1997 case 4:
1998 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1999 goto out_no_sec;
2000 case 5:
2001 memset(data->context, 0, sizeof(data->context));
2002 case 6:
b7e24457
TM		 2003 if (data->flags & NFS_MOUNT_VER3) {
2004 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
2005 goto out_invalid_fh;
5df36e78 2006 mntfh->size = data->root.size;
764302cc
CL		 2007 args->version = 3;
2008 } else {
5df36e78 2009 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 2010 args->version = 2;
2011 }
5df36e78 2012
5df36e78
CL		 2013
2014 memcpy(mntfh->data, data->root.data, mntfh->size);
2015 if (mntfh->size < sizeof(mntfh->data))
2016 memset(mntfh->data + mntfh->size, 0,
2017 sizeof(mntfh->data) - mntfh->size);
6e88e061 2018
2283f8d6
TT		 2019 /*
2020 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2021 * can deal with.
2022 */
ff3525a5 2023 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
74c98811 2024 args->flags |= extra_flags;
2283f8d6
TT		 2025 args->rsize = data->rsize;
2026 args->wsize = data->wsize;
2283f8d6
TT		 2027 args->timeo = data->timeo;
2028 args->retrans = data->retrans;
2029 args->acregmin = data->acregmin;
2030 args->acregmax = data->acregmax;
2031 args->acdirmin = data->acdirmin;
2032 args->acdirmax = data->acdirmax;
b72e4f42 2033 args->need_mount = false;
4c568017 2034
4cfd74fc 2035 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 2036 args->nfs_server.addrlen = sizeof(data->addr);
872ece86 2037 args->nfs_server.port = ntohs(data->addr.sin_port);
4cfd74fc 2038 if (!nfs_verify_server_address(sap))
4c568017
CL		 2039 goto out_no_address;
2040
2283f8d6 2041 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 2042 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 2043 /* N.B. caller will free nfs_server.hostname in all cases */
2044 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2045 args->namlen = data->namlen;
2046 args->bsize = data->bsize;
dd07c947
CL		 2047
2048 if (data->flags & NFS_MOUNT_SECFLAVOUR)
a3f73c27 2049 args->selected_flavor = data->pseudoflavor;
74c98811 2050 else
a3f73c27 2051 args->selected_flavor = RPC_AUTH_UNIX;
63649bd7
CG		 2052 if (!args->nfs_server.hostname)
2053 goto out_nomem;
f9c3a380 2054
5eebde23
SJ		 2055 if (!(data->flags & NFS_MOUNT_NONLM))
2056 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2057 NFS_MOUNT_LOCAL_FCNTL);
2058 else
2059 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2060 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 2061 /*
2062 * The legacy version 6 binary mount data from userspace has a
2063 * field used only to transport selinux information into the
2064 * the kernel. To continue to support that functionality we
2065 * have a touch of selinux knowledge here in the NFS code. The
2066 * userspace code converted context=blah to just blah so we are
2067 * converting back to the full string selinux understands.
2068 */
2069 if (data->context[0]){
2070#ifdef CONFIG_SECURITY_SELINUX
2071 int rc;
2072 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2073 if (!opts_str)
2074 return -ENOMEM;
2075 strcpy(opts_str, "context=");
2076 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2077 strcat(opts_str, &data->context[0]);
2078 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2079 kfree(opts_str);
2080 if (rc)
2081 return rc;
2082#else
2083 return -EINVAL;
2084#endif
2085 }
2086
5df36e78 2087 break;
b72e4f42
BS		 2088 default:
2089 return NFS_TEXT_DATA;
f7b422b1 2090 }
54ceac45 2091
5df36e78 2092 return 0;
f7b422b1 2093
5df36e78
CL		 2094out_no_data:
2095 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2096 return -EINVAL;
54ceac45 2097
5df36e78
CL		 2098out_no_v3:
2099 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2100 data->version);
2101 return -EINVAL;
f7b422b1 2102
5df36e78
CL		 2103out_no_sec:
2104 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2105 return -EINVAL;
2106
63649bd7
CG		 2107out_nomem:
2108 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2109 return -ENOMEM;
2110
5df36e78
CL		 2111out_no_address:
2112 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2113 return -EINVAL;
2114
2115out_invalid_fh:
2116 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2117 return -EINVAL;
f7b422b1
DH		 2118}
2119
89d77c8f 2120#if IS_ENABLED(CONFIG_NFS_V4)
d72c727c
BS		 2121static int nfs_validate_mount_data(struct file_system_type *fs_type,
2122 void *options,
2123 struct nfs_parsed_mount_data *args,
2124 struct nfs_fh *mntfh,
2125 const char *dev_name)
2126{
2127 if (fs_type == &nfs_fs_type)
2128 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2129 return nfs4_validate_mount_data(options, args, dev_name);
2130}
2131#else
2132static int nfs_validate_mount_data(struct file_system_type *fs_type,
2133 void *options,
2134 struct nfs_parsed_mount_data *args,
2135 struct nfs_fh *mntfh,
2136 const char *dev_name)
2137{
2138 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2139}
2140#endif
2141
b72e4f42
BS		 2142static int nfs_validate_text_mount_data(void *options,
2143 struct nfs_parsed_mount_data *args,
2144 const char *dev_name)
2145{
2146 int port = 0;
2147 int max_namelen = PAGE_SIZE;
2148 int max_pathlen = NFS_MAXPATHLEN;
2149 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2150
2151 if (nfs_parse_mount_options((char *)options, args) == 0)
2152 return -EINVAL;
2153
2154 if (!nfs_verify_server_address(sap))
2155 goto out_no_address;
2156
2157 if (args->version == 4) {
89d77c8f 2158#if IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2159 port = NFS_PORT;
2160 max_namelen = NFS4_MAXNAMLEN;
2161 max_pathlen = NFS4_MAXPATHLEN;
2162 nfs_validate_transport_protocol(args);
6da1a034
TM		 2163 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2164 goto out_invalid_transport_udp;
b72e4f42
BS		 2165 nfs4_validate_mount_flags(args);
2166#else
2167 goto out_v4_not_compiled;
2168#endif /* CONFIG_NFS_V4 */
2169 } else
2170 nfs_set_mount_transport_protocol(args);
2171
2172 nfs_set_port(sap, &args->nfs_server.port, port);
2173
b72e4f42
BS		 2174 return nfs_parse_devname(dev_name,
2175 &args->nfs_server.hostname,
2176 max_namelen,
2177 &args->nfs_server.export_path,
2178 max_pathlen);
2179
89d77c8f 2180#if !IS_ENABLED(CONFIG_NFS_V4)
b72e4f42
BS		 2181out_v4_not_compiled:
2182 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2183 return -EPROTONOSUPPORT;
6da1a034
TM		 2184#else
2185out_invalid_transport_udp:
2186 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2187 return -EINVAL;
b72e4f42
BS		 2188#endif /* !CONFIG_NFS_V4 */
2189
2190out_no_address:
2191 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2192 return -EINVAL;
b72e4f42
BS		 2193}
2194
71a6ec8a 2195#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
c8e47028
SM		 2196 | NFS_MOUNT_SECURE \
2197 | NFS_MOUNT_TCP \
2198 | NFS_MOUNT_VER3 \
2199 | NFS_MOUNT_KERBEROS \
2200 | NFS_MOUNT_NONLM \
2201 | NFS_MOUNT_BROKEN_SUID \
2202 | NFS_MOUNT_STRICTLOCK \
c8e47028
SM		 2203 | NFS_MOUNT_LEGACY_INTERFACE)
2204
71a6ec8a
SM		 2205#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2206 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2207
48b605f8
JL		 2208static int
2209nfs_compare_remount_data(struct nfs_server *nfss,
2210 struct nfs_parsed_mount_data *data)
2211{
71a6ec8a 2212 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
48b605f8
JL		 2213 data->rsize != nfss->rsize ||
2214 data->wsize != nfss->wsize ||
57acc40d
JL		 2215 data->version != nfss->nfs_client->rpc_ops->version ||
2216 data->minorversion != nfss->nfs_client->cl_minorversion ||
48b605f8 2217 data->retrans != nfss->client->cl_timeout->to_retries ||
09a330f4 2218 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
48b605f8
JL		 2219 data->acregmin != nfss->acregmin / HZ ||
2220 data->acregmax != nfss->acregmax / HZ ||
2221 data->acdirmin != nfss->acdirmin / HZ ||
2222 data->acdirmax != nfss->acdirmax / HZ ||
2223 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2224 data->nfs_server.port != nfss->port ||
48b605f8 2225 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2226 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2227 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2228 return -EINVAL;
2229
2230 return 0;
2231}
2232
fbdefd64 2233int
48b605f8
JL		 2234nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2235{
2236 int error;
2237 struct nfs_server *nfss = sb->s_fs_info;
2238 struct nfs_parsed_mount_data *data;
2239 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2240 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2241 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8 2242
02b9984d
TT		 2243 sync_filesystem(sb);
2244
48b605f8
JL		 2245 /*
2246 * Userspace mount programs that send binary options generally send
2247 * them populated with default values. We have no way to know which
2248 * ones were explicitly specified. Fall back to legacy behavior and
2249 * just return success.
2250 */
31c94469
MZ		 2251 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2252 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2253 options->version <= 6))))
48b605f8
JL		 2254 return 0;
2255
2256 data = kzalloc(sizeof(*data), GFP_KERNEL);
2257 if (data == NULL)
2258 return -ENOMEM;
2259
2260 /* fill out struct with values from existing mount */
2261 data->flags = nfss->flags;
2262 data->rsize = nfss->rsize;
2263 data->wsize = nfss->wsize;
2264 data->retrans = nfss->client->cl_timeout->to_retries;
a3f73c27 2265 data->selected_flavor = nfss->client->cl_auth->au_flavor;
48b605f8
JL		 2266 data->acregmin = nfss->acregmin / HZ;
2267 data->acregmax = nfss->acregmax / HZ;
2268 data->acdirmin = nfss->acdirmin / HZ;
2269 data->acdirmax = nfss->acdirmax / HZ;
2270 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2271 data->nfs_server.port = nfss->port;
48b605f8 2272 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
57acc40d
JL		 2273 data->version = nfsvers;
2274 data->minorversion = nfss->nfs_client->cl_minorversion;
a914722f 2275 data->net = current->nsproxy->net_ns;
48b605f8
JL		 2276 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2277 data->nfs_server.addrlen);
2278
2279 /* overwrite those values with any that were specified */
1966903f
JL		 2280 error = -EINVAL;
2281 if (!nfs_parse_mount_options((char *)options, data))
48b605f8
JL		 2282 goto out;
2283
26c4c170
JL		 2284 /*
2285 * noac is a special case. It implies -o sync, but that's not
2286 * necessarily reflected in the mtab options. do_remount_sb
2287 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2288 * remount options, so we have to explicitly reset it.
2289 */
2290 if (data->flags & NFS_MOUNT_NOAC)
2291 *flags |= MS_SYNCHRONOUS;
2292
48b605f8
JL		 2293 /* compare new mount options with old ones */
2294 error = nfs_compare_remount_data(nfss, data);
2295out:
2296 kfree(data);
2297 return error;
2298}
89d77c8f 2299EXPORT_SYMBOL_GPL(nfs_remount);
48b605f8 2300
f7b422b1 2301/*
54ceac45 2302 * Initialise the common bits of the superblock
f7b422b1 2303 */
4f253e1e 2304static void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2305{
54ceac45 2306 struct nfs_server *server = NFS_SB(sb);
5006a76c 2307
54ceac45 2308 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2309
54ceac45
DH		 2310 /* We probably want something more informative here */
2311 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2312 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2313
54ceac45
DH		 2314 if (sb->s_blocksize == 0)
2315 sb->s_blocksize = nfs_block_bits(server->wsize,
2316 &sb->s_blocksize_bits);
f7b422b1 2317
54ceac45 2318 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2319}
2320
2321/*
54ceac45 2322 * Finish setting up an NFS2/3 superblock
f7b422b1 2323 */
9052c7cf 2324void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
f7b422b1 2325{
c40f8d1d 2326 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2327 struct nfs_server *server = NFS_SB(sb);
5006a76c 2328
54ceac45
DH		 2329 sb->s_blocksize_bits = 0;
2330 sb->s_blocksize = 0;
6a74490d
BS		 2331 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2332 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2333 if (data && data->bsize)
54ceac45 2334 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2335
6a74490d 2336 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2337 /* The VFS shouldn't apply the umask to mode bits. We will do
2338 * so ourselves when necessary.
2339 */
2340 sb->s_flags |= MS_POSIXACL;
2341 sb->s_time_gran = 1;
20fa1902 2342 sb->s_export_op = &nfs_export_ops;
816724e6 2343 }
54ceac45 2344
54ceac45 2345 nfs_initialise_sb(sb);
f7b422b1 2346}
89d77c8f 2347EXPORT_SYMBOL_GPL(nfs_fill_super);
f7b422b1
DH		 2348
2349/*
3cadf4b8 2350 * Finish setting up a cloned NFS2/3/4 superblock
f7b422b1 2351 */
4f253e1e
JK		 2352static void nfs_clone_super(struct super_block *sb,
2353 struct nfs_mount_info *mount_info)
f7b422b1 2354{
8c958e0c 2355 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2356 struct nfs_server *server = NFS_SB(sb);
2357
2358 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2359 sb->s_blocksize = old_sb->s_blocksize;
2360 sb->s_maxbytes = old_sb->s_maxbytes;
3cadf4b8
BS		 2361 sb->s_xattr = old_sb->s_xattr;
2362 sb->s_op = old_sb->s_op;
2363 sb->s_time_gran = 1;
20fa1902 2364 sb->s_export_op = old_sb->s_export_op;
f7b422b1 2365
3cadf4b8 2366 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 2367 /* The VFS shouldn't apply the umask to mode bits. We will do
2368 * so ourselves when necessary.
f7b422b1
DH		 2369 */
2370 sb->s_flags |= MS_POSIXACL;
f7b422b1
DH		 2371 }
2372
54ceac45 2373 nfs_initialise_sb(sb);
f7b422b1
DH		 2374}
2375
275a5d24
TM		 2376static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2377{
2378 const struct nfs_server *a = s->s_fs_info;
2379 const struct rpc_clnt *clnt_a = a->client;
2380 const struct rpc_clnt *clnt_b = b->client;
2381
2382 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2383 goto Ebusy;
2384 if (a->nfs_client != b->nfs_client)
2385 goto Ebusy;
0aea92bf 2386 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
275a5d24
TM		 2387 goto Ebusy;
2388 if (a->wsize != b->wsize)
2389 goto Ebusy;
2390 if (a->rsize != b->rsize)
2391 goto Ebusy;
2392 if (a->acregmin != b->acregmin)
2393 goto Ebusy;
2394 if (a->acregmax != b->acregmax)
2395 goto Ebusy;
2396 if (a->acdirmin != b->acdirmin)
2397 goto Ebusy;
2398 if (a->acdirmax != b->acdirmax)
2399 goto Ebusy;
5837f6df 2400 if (b->auth_info.flavor_len > 0 &&
0aea92bf 2401 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
275a5d24 2402 goto Ebusy;
e89a5a43 2403 return 1;
275a5d24 2404Ebusy:
e89a5a43
TM		 2405 return 0;
2406}
2407
2408struct nfs_sb_mountdata {
2409 struct nfs_server *server;
2410 int mntflags;
2411};
2412
2413static int nfs_set_super(struct super_block *s, void *data)
2414{
2415 struct nfs_sb_mountdata *sb_mntdata = data;
2416 struct nfs_server *server = sb_mntdata->server;
2417 int ret;
2418
2419 s->s_flags = sb_mntdata->mntflags;
2420 s->s_fs_info = server;
8b244ff2 2421 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2422 ret = set_anon_super(s, server);
2423 if (ret == 0)
2424 server->s_dev = s->s_dev;
2425 return ret;
2426}
2427
fd00a8ff
CL		 2428static int nfs_compare_super_address(struct nfs_server *server1,
2429 struct nfs_server *server2)
2430{
2431 struct sockaddr *sap1, *sap2;
7e3fcf61
BF		 2432 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
2433 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
2434
2435 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
2436 return 0;
fd00a8ff
CL		 2437
2438 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2439 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2440
2441 if (sap1->sa_family != sap2->sa_family)
2442 return 0;
2443
2444 switch (sap1->sa_family) {
2445 case AF_INET: {
2446 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2447 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2448 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2449 return 0;
2450 if (sin1->sin_port != sin2->sin_port)
2451 return 0;
2452 break;
2453 }
2454 case AF_INET6: {
2455 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2456 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2457 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2458 return 0;
2459 if (sin1->sin6_port != sin2->sin6_port)
2460 return 0;
2461 break;
2462 }
2463 default:
2464 return 0;
2465 }
2466
2467 return 1;
2468}
2469
e89a5a43
TM		 2470static int nfs_compare_super(struct super_block *sb, void *data)
2471{
2472 struct nfs_sb_mountdata *sb_mntdata = data;
2473 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2474 int mntflags = sb_mntdata->mntflags;
2475
fd00a8ff 2476 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2477 return 0;
2478 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2479 if (old->flags & NFS_MOUNT_UNSHARED)
2480 return 0;
2481 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2482 return 0;
2483 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2484}
2485
39ffb921 2486#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2487static void nfs_get_cache_cookie(struct super_block *sb,
2488 struct nfs_parsed_mount_data *parsed,
2489 struct nfs_clone_mount *cloned)
2490{
c4271c6e 2491 struct nfs_server *nfss = NFS_SB(sb);
2311b943
BS		 2492 char *uniq = NULL;
2493 int ulen = 0;
2494
c4271c6e
TM		 2495 nfss->fscache_key = NULL;
2496 nfss->fscache = NULL;
2497
2498 if (parsed) {
2499 if (!(parsed->options & NFS_OPTION_FSCACHE))
2500 return;
2501 if (parsed->fscache_uniq) {
2502 uniq = parsed->fscache_uniq;
2503 ulen = strlen(parsed->fscache_uniq);
2504 }
2311b943
BS		 2505 } else if (cloned) {
2506 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
c4271c6e
TM		 2507 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2508 return;
2311b943
BS		 2509 if (mnt_s->fscache_key) {
2510 uniq = mnt_s->fscache_key->key.uniquifier;
2511 ulen = mnt_s->fscache_key->key.uniq_len;
2512 };
c4271c6e
TM		 2513 } else
2514 return;
2311b943
BS		 2515
2516 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2517}
39ffb921
TM		 2518#else
2519static void nfs_get_cache_cookie(struct super_block *sb,
2520 struct nfs_parsed_mount_data *parsed,
2521 struct nfs_clone_mount *cloned)
2522{
2523}
2524#endif
2311b943 2525
fbdefd64
BS		 2526int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2527 struct nfs_mount_info *mount_info)
3d176e3f 2528{
aa9c2669
DQ		 2529 int error;
2530 unsigned long kflags = 0, kflags_out = 0;
2531 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2532 kflags |= SECURITY_LSM_NATIVE_LABELS;
2533
2534 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2535 kflags, &kflags_out);
2536 if (error)
2537 goto err;
2538
2539 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2540 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2541 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2542err:
2543 return error;
3d176e3f 2544}
89d77c8f 2545EXPORT_SYMBOL_GPL(nfs_set_sb_security);
3d176e3f 2546
fbdefd64
BS		 2547int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2548 struct nfs_mount_info *mount_info)
3d176e3f 2549{
0b4d3452
SM		 2550 int error;
2551 unsigned long kflags = 0, kflags_out = 0;
2552
3d176e3f 2553 /* clone any lsm security options from the parent to the new sb */
2b0143b5 2554 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
3d176e3f 2555 return -ESTALE;
0b4d3452
SM		 2556
2557 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2558 kflags |= SECURITY_LSM_NATIVE_LABELS;
2559
2560 error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags,
2561 &kflags_out);
2562 if (error)
2563 return error;
2564
2565 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2566 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2567 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2568 return 0;
3d176e3f 2569}
89d77c8f 2570EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
3d176e3f 2571
ab7017a3 2572struct dentry *nfs_fs_mount_common(struct nfs_server *server,
fbdefd64 2573 int flags, const char *dev_name,
ab7017a3
BS		 2574 struct nfs_mount_info *mount_info,
2575 struct nfs_subversion *nfs_mod)
f7b422b1 2576{
f7b422b1 2577 struct super_block *s;
01194981 2578 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2579 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2580 struct nfs_sb_mountdata sb_mntdata = {
2581 .mntflags = flags,
c40f8d1d 2582 .server = server,
e89a5a43 2583 };
01194981 2584 int error;
33852a1f 2585
75180df2
TM		 2586 if (server->flags & NFS_MOUNT_UNSHARED)
2587 compare_super = NULL;
2588
fb2088cc
SP		 2589 /* -o noac implies -o sync */
2590 if (server->flags & NFS_MOUNT_NOAC)
2591 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2592
e890db01
SM		 2593 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2594 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2595 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2596
54ceac45 2597 /* Get a superblock - note that we may end up sharing one that already exists */
ab7017a3 2598 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
816724e6 2599 if (IS_ERR(s)) {
01194981 2600 mntroot = ERR_CAST(s);
54ceac45 2601 goto out_err_nosb;
816724e6
TM		 2602 }
2603
54ceac45
DH		 2604 if (s->s_fs_info != server) {
2605 nfs_free_server(server);
2606 server = NULL;
fa799759 2607 } else {
9052c7cf
JK		 2608 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
2609 MINOR(server->s_dev));
2610 if (error) {
2611 mntroot = ERR_PTR(error);
2612 goto error_splat_super;
2613 }
2614 s->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD;
ce6cda18 2615 server->super = s;
54ceac45 2616 }
f7b422b1 2617
54ceac45
DH		 2618 if (!s->s_root) {
2619 /* initial superblock/root creation */
9052c7cf 2620 mount_info->fill_super(s, mount_info);
3d176e3f 2621 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2622 }
f7b422b1 2623
87c7083d 2624 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2625 if (IS_ERR(mntroot))
54ceac45 2626 goto error_splat_super;
816724e6 2627
3d176e3f 2628 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2629 if (error)
2630 goto error_splat_root;
2631
54ceac45 2632 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2633
2634out:
01194981 2635 return mntroot;
816724e6 2636
54ceac45
DH		 2637out_err_nosb:
2638 nfs_free_server(server);
0655960f 2639 goto out;
54ceac45 2640
f9c3a380
EP		 2641error_splat_root:
2642 dput(mntroot);
01194981 2643 mntroot = ERR_PTR(error);
54ceac45 2644error_splat_super:
6f5bbff9 2645 deactivate_locked_super(s);
0655960f 2646 goto out;
f7b422b1 2647}
89d77c8f 2648EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
f7b422b1 2649
fbdefd64 2650struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
c40f8d1d
BS		 2651 int flags, const char *dev_name, void *raw_data)
2652{
c40f8d1d
BS		 2653 struct nfs_mount_info mount_info = {
2654 .fill_super = nfs_fill_super,
3d176e3f 2655 .set_security = nfs_set_sb_security,
c40f8d1d 2656 };
c40f8d1d 2657 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2658 struct nfs_subversion *nfs_mod;
c40f8d1d
BS		 2659 int error;
2660
46058d46 2661 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2662 mount_info.mntfh = nfs_alloc_fhandle();
2663 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2664 goto out;
2665
2666 /* Validate the mount data */
87c7083d 2667 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2668 if (error == NFS_TEXT_DATA)
46058d46 2669 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2670 if (error < 0) {
2671 mntroot = ERR_PTR(error);
2672 goto out;
2673 }
c40f8d1d 2674
ab7017a3
BS		 2675 nfs_mod = get_nfs_version(mount_info.parsed->version);
2676 if (IS_ERR(nfs_mod)) {
2677 mntroot = ERR_CAST(nfs_mod);
2678 goto out;
2679 }
2680
ff9099f2 2681 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
ab7017a3
BS		 2682
2683 put_nfs_version(nfs_mod);
c40f8d1d 2684out:
46058d46 2685 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2686 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2687 return mntroot;
2688}
89d77c8f 2689EXPORT_SYMBOL_GPL(nfs_fs_mount);
c40f8d1d 2690
54ceac45
DH		 2691/*
2692 * Destroy an NFS2/3 superblock
2693 */
fbdefd64 2694void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 2695{
2696 struct nfs_server *server = NFS_SB(s);
7b14a213
CH		 2697 dev_t dev = s->s_dev;
2698
2699 generic_shutdown_super(s);
f7b422b1 2700
08734048 2701 nfs_fscache_release_super_cookie(s);
7b14a213 2702
54ceac45 2703 nfs_free_server(server);
7b14a213 2704 free_anon_bdev(dev);
f7b422b1 2705}
89d77c8f 2706EXPORT_SYMBOL_GPL(nfs_kill_super);
f7b422b1 2707
54ceac45 2708/*
8c958e0c 2709 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2710 */
3dd4f8ef 2711static struct dentry *
e8f25e6d
BS		 2712nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2713 const char *dev_name, void *raw_data)
f7b422b1 2714{
e8f25e6d
BS		 2715 struct nfs_clone_mount *data = raw_data;
2716 struct nfs_mount_info mount_info = {
2717 .fill_super = nfs_clone_super,
2718 .set_security = nfs_clone_sb_security,
2719 .cloned = data,
2720 };
54ceac45 2721 struct nfs_server *server;
3d176e3f 2722 struct dentry *mntroot = ERR_PTR(-ENOMEM);
ab7017a3 2723 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
f7b422b1 2724
dee972b9 2725 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2726
e8f25e6d 2727 mount_info.mntfh = mount_info.cloned->fh;
87c7083d 2728
54ceac45 2729 /* create a new volume representation */
1179acc6 2730 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
f7b422b1 2731
dee972b9
TM		 2732 if (IS_ERR(server))
2733 mntroot = ERR_CAST(server);
2734 else
2735 mntroot = nfs_fs_mount_common(server, flags,
2736 dev_name, &mount_info, nfs_mod);
24c8dbbb 2737
dee972b9
TM		 2738 dprintk("<-- nfs_xdev_mount() = %ld\n",
2739 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2740 return mntroot;
f7b422b1
DH		 2741}
2742
89d77c8f 2743#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45 2744
01c3f052
TM		 2745static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2746{
5eebde23
SJ		 2747 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2748 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2749}
2750
f0768ebd
CL		 2751/*
2752 * Validate NFSv4 mount options
2753 */
91ea40b9
TT		 2754static int nfs4_validate_mount_data(void *options,
2755 struct nfs_parsed_mount_data *args,
2756 const char *dev_name)
f0768ebd 2757{
4cfd74fc 2758 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2759 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2760 char *c;
2761
2762 if (data == NULL)
2763 goto out_no_data;
2764
cdf66442
BS		 2765 args->version = 4;
2766
f0768ebd
CL		 2767 switch (data->version) {
2768 case 1:
4c568017
CL		 2769 if (data->host_addrlen > sizeof(args->nfs_server.address))
2770 goto out_no_address;
2771 if (data->host_addrlen == 0)
f0768ebd 2772 goto out_no_address;
4c568017 2773 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2774 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2775 return -EFAULT;
4cfd74fc 2776 if (!nfs_verify_server_address(sap))
f0768ebd 2777 goto out_no_address;
872ece86 2778 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
f0768ebd 2779
6738b251 2780 if (data->auth_flavourlen) {
74c98811 2781 rpc_authflavor_t pseudoflavor;
6738b251
CL		 2782 if (data->auth_flavourlen > 1)
2783 goto out_inval_auth;
74c98811 2784 if (copy_from_user(&pseudoflavor,
91ea40b9 2785 data->auth_flavours,
74c98811 2786 sizeof(pseudoflavor)))
f0768ebd 2787 return -EFAULT;
a3f73c27 2788 args->selected_flavor = pseudoflavor;
74c98811 2789 } else
a3f73c27 2790 args->selected_flavor = RPC_AUTH_UNIX;
f0768ebd
CL		 2791
2792 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2793 if (IS_ERR(c))
2794 return PTR_ERR(c);
91ea40b9 2795 args->nfs_server.hostname = c;
f0768ebd
CL		 2796
2797 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2798 if (IS_ERR(c))
2799 return PTR_ERR(c);
91ea40b9
TT		 2800 args->nfs_server.export_path = c;
2801 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2802
2803 c = strndup_user(data->client_addr.data, 16);
2804 if (IS_ERR(c))
2805 return PTR_ERR(c);
91ea40b9
TT		 2806 args->client_address = c;
2807
2808 /*
2809 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2810 * can deal with.
2811 */
2812
2813 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2814 args->rsize = data->rsize;
2815 args->wsize = data->wsize;
2816 args->timeo = data->timeo;
2817 args->retrans = data->retrans;
2818 args->acregmin = data->acregmin;
2819 args->acregmax = data->acregmax;
2820 args->acdirmin = data->acdirmin;
2821 args->acdirmax = data->acdirmax;
2822 args->nfs_server.protocol = data->proto;
259875ef 2823 nfs_validate_transport_protocol(args);
6da1a034
TM		 2824 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2825 goto out_invalid_transport_udp;
f0768ebd
CL		 2826
2827 break;
7630c852 2828 default:
b72e4f42 2829 return NFS_TEXT_DATA;
f0768ebd
CL		 2830 }
2831
2832 return 0;
2833
2834out_no_data:
2835 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2836 return -EINVAL;
2837
2838out_inval_auth:
2839 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2840 data->auth_flavourlen);
2841 return -EINVAL;
2842
2843out_no_address:
2844 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2845 return -EINVAL;
6da1a034
TM		 2846
2847out_invalid_transport_udp:
2848 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2849 return -EINVAL;
f0768ebd
CL		 2850}
2851
fac1e8e4
BS		 2852/*
2853 * NFS v4 module parameters need to stay in the
2854 * NFS client for backwards compatibility
2855 */
2856unsigned int nfs_callback_set_tcpport;
5405fc44 2857unsigned short nfs_callback_nr_threads;
fac1e8e4
BS		 2858/* Default cache timeout is 10 minutes */
2859unsigned int nfs_idmap_cache_timeout = 600;
2860/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2861bool nfs4_disable_idmapping = true;
2862unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
5405fc44 2863unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
fac1e8e4 2864unsigned short send_implementation_id = 1;
6f2ea7f2 2865char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
f6de7a39 2866bool recover_lost_locks = false;
fac1e8e4 2867
5405fc44 2868EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
89d77c8f 2869EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
89d77c8f
BS		 2870EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2871EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2872EXPORT_SYMBOL_GPL(max_session_slots);
5405fc44 2873EXPORT_SYMBOL_GPL(max_session_cb_slots);
89d77c8f 2874EXPORT_SYMBOL_GPL(send_implementation_id);
6f2ea7f2 2875EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
f6de7a39 2876EXPORT_SYMBOL_GPL(recover_lost_locks);
89d77c8f 2877
fac1e8e4
BS		 2878#define NFS_CALLBACK_MAXPORTNR (65535U)
2879
2880static int param_set_portnr(const char *val, const struct kernel_param *kp)
2881{
2882 unsigned long num;
2883 int ret;
2884
2885 if (!val)
2886 return -EINVAL;
7297cb68 2887 ret = kstrtoul(val, 0, &num);
fac1e8e4
BS		 2888 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2889 return -EINVAL;
2890 *((unsigned int *)kp->arg) = num;
2891 return 0;
2892}
9c27847d 2893static const struct kernel_param_ops param_ops_portnr = {
fac1e8e4
BS		 2894 .set = param_set_portnr,
2895 .get = param_get_uint,
2896};
2897#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2898
2899module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
5405fc44
TM		 2900module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
2901MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
2902 "assigned to the NFSv4 callback channels.");
fac1e8e4
BS		 2903module_param(nfs_idmap_cache_timeout, int, 0644);
2904module_param(nfs4_disable_idmapping, bool, 0644);
6f2ea7f2
CL		 2905module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2906 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
fac1e8e4
BS		 2907MODULE_PARM_DESC(nfs4_disable_idmapping,
2908 "Turn off NFSv4 idmapping when using 'sec=sys'");
2909module_param(max_session_slots, ushort, 0644);
2910MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2911 "requests the client will negotiate");
5405fc44 2912module_param(max_session_cb_slots, ushort, 0644);
f36ab161 2913MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
5405fc44 2914 "callbacks the client will process for a given server");
fac1e8e4
BS		 2915module_param(send_implementation_id, ushort, 0644);
2916MODULE_PARM_DESC(send_implementation_id,
2917 "Send implementation ID with NFSv4.1 exchange_id");
6f2ea7f2 2918MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
425e776d 2919
f6de7a39
TM		 2920module_param(recover_lost_locks, bool, 0644);
2921MODULE_PARM_DESC(recover_lost_locks,
2922 "If the server reports that a lock might be lost, "
2923 "try to recover it risking data corruption.");
2924
2925
54ceac45 2926#endif /* CONFIG_NFS_V4 */
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