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NFS: Refactor NFSv4 text-based mount option validation
[mirror_ubuntu-bionic-kernel.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
42#include <linux/smp_lock.h>
43#include <linux/seq_file.h>
44#include <linux/mount.h>
c02d7adf
TM		 45#include <linux/mnt_namespace.h>
46#include <linux/namei.h>
f7b422b1
DH		 47#include <linux/nfs_idmap.h>
48#include <linux/vfs.h>
49#include <linux/inet.h>
fd00a8ff
CL		 50#include <linux/in6.h>
51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.h>
f7b422b1
DH		 56
57#include <asm/system.h>
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
f7b422b1
DH		 66
67#define NFSDBG_FACILITY NFSDBG_VFS
68
bf0fd768
CL		 69enum {
70 /* Mount options that take no arguments */
71 Opt_soft, Opt_hard,
bf0fd768
CL		 72 Opt_posix, Opt_noposix,
73 Opt_cto, Opt_nocto,
74 Opt_ac, Opt_noac,
75 Opt_lock, Opt_nolock,
76 Opt_v2, Opt_v3,
2cf7ff7a 77 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 78 Opt_acl, Opt_noacl,
79 Opt_rdirplus, Opt_nordirplus,
75180df2 80 Opt_sharecache, Opt_nosharecache,
d740351b 81 Opt_resvport, Opt_noresvport,
b797cac7 82 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 83
84 /* Mount options that take integer arguments */
85 Opt_port,
86 Opt_rsize, Opt_wsize, Opt_bsize,
87 Opt_timeo, Opt_retrans,
88 Opt_acregmin, Opt_acregmax,
89 Opt_acdirmin, Opt_acdirmax,
90 Opt_actimeo,
91 Opt_namelen,
92 Opt_mountport,
e887cbcf 93 Opt_mountvers,
ad879cef 94 Opt_nfsvers,
3fd5be9e 95 Opt_minorversion,
bf0fd768
CL		 96
97 /* Mount options that take string arguments */
33832034 98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 100 Opt_lookupcache,
b797cac7 101 Opt_fscache_uniq,
bf0fd768 102
f45663ce
CL		 103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 105
106 Opt_err
107};
108
a447c093 109static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
ecbb3845
CL		 112 { Opt_userspace, "retry=%s" },
113
f45663ce
CL		 114 { Opt_sloppy, "sloppy" },
115
bf0fd768
CL		 116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
d33e4dfe
CL		 118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
bf0fd768
CL		 120 { Opt_posix, "posix" },
121 { Opt_noposix, "noposix" },
122 { Opt_cto, "cto" },
123 { Opt_nocto, "nocto" },
124 { Opt_ac, "ac" },
125 { Opt_noac, "noac" },
126 { Opt_lock, "lock" },
127 { Opt_nolock, "nolock" },
128 { Opt_v2, "v2" },
129 { Opt_v3, "v3" },
130 { Opt_udp, "udp" },
131 { Opt_tcp, "tcp" },
2cf7ff7a 132 { Opt_rdma, "rdma" },
bf0fd768
CL		 133 { Opt_acl, "acl" },
134 { Opt_noacl, "noacl" },
135 { Opt_rdirplus, "rdirplus" },
136 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 137 { Opt_sharecache, "sharecache" },
138 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 139 { Opt_resvport, "resvport" },
140 { Opt_noresvport, "noresvport" },
b797cac7
DH		 141 { Opt_fscache, "fsc" },
142 { Opt_fscache_uniq, "fsc=%s" },
143 { Opt_nofscache, "nofsc" },
bf0fd768 144
a5a16bae
CL		 145 { Opt_port, "port=%s" },
146 { Opt_rsize, "rsize=%s" },
147 { Opt_wsize, "wsize=%s" },
148 { Opt_bsize, "bsize=%s" },
149 { Opt_timeo, "timeo=%s" },
150 { Opt_retrans, "retrans=%s" },
151 { Opt_acregmin, "acregmin=%s" },
152 { Opt_acregmax, "acregmax=%s" },
153 { Opt_acdirmin, "acdirmin=%s" },
154 { Opt_acdirmax, "acdirmax=%s" },
155 { Opt_actimeo, "actimeo=%s" },
156 { Opt_namelen, "namlen=%s" },
157 { Opt_mountport, "mountport=%s" },
158 { Opt_mountvers, "mountvers=%s" },
159 { Opt_nfsvers, "nfsvers=%s" },
160 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 161 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 162
163 { Opt_sec, "sec=%s" },
164 { Opt_proto, "proto=%s" },
165 { Opt_mountproto, "mountproto=%s" },
166 { Opt_addr, "addr=%s" },
167 { Opt_clientaddr, "clientaddr=%s" },
33832034 168 { Opt_mounthost, "mounthost=%s" },
0ac83779 169 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 170
7973c1f1
TM		 171 { Opt_lookupcache, "lookupcache=%s" },
172
bf0fd768
CL		 173 { Opt_err, NULL }
174};
175
176enum {
2cf7ff7a 177 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 178
179 Opt_xprt_err
180};
181
a447c093 182static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768
CL		 183 { Opt_xprt_udp, "udp" },
184 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 185 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 186
187 { Opt_xprt_err, NULL }
188};
189
190enum {
191 Opt_sec_none, Opt_sec_sys,
192 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
193 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
194 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
195
196 Opt_sec_err
197};
198
a447c093 199static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 200 { Opt_sec_none, "none" },
201 { Opt_sec_none, "null" },
202 { Opt_sec_sys, "sys" },
203
204 { Opt_sec_krb5, "krb5" },
205 { Opt_sec_krb5i, "krb5i" },
206 { Opt_sec_krb5p, "krb5p" },
207
208 { Opt_sec_lkey, "lkey" },
209 { Opt_sec_lkeyi, "lkeyi" },
210 { Opt_sec_lkeyp, "lkeyp" },
211
8d042218
OK		 212 { Opt_sec_spkm, "spkm3" },
213 { Opt_sec_spkmi, "spkm3i" },
214 { Opt_sec_spkmp, "spkm3p" },
215
bf0fd768
CL		 216 { Opt_sec_err, NULL }
217};
218
7973c1f1
TM		 219enum {
220 Opt_lookupcache_all, Opt_lookupcache_positive,
221 Opt_lookupcache_none,
222
223 Opt_lookupcache_err
224};
225
226static match_table_t nfs_lookupcache_tokens = {
227 { Opt_lookupcache_all, "all" },
228 { Opt_lookupcache_positive, "pos" },
229 { Opt_lookupcache_positive, "positive" },
230 { Opt_lookupcache_none, "none" },
231
232 { Opt_lookupcache_err, NULL }
233};
234
bf0fd768 235
42faad99 236static void nfs_umount_begin(struct super_block *);
816724e6 237static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 238static int nfs_show_options(struct seq_file *, struct vfsmount *);
239static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 240static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 241static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 242 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1 243static void nfs_kill_super(struct super_block *);
48b605f8 244static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 245
246static struct file_system_type nfs_fs_type = {
247 .owner = THIS_MODULE,
248 .name = "nfs",
249 .get_sb = nfs_get_sb,
250 .kill_sb = nfs_kill_super,
349457cc 251 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 252};
253
54ceac45 254struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 255 .owner = THIS_MODULE,
256 .name = "nfs",
54ceac45 257 .get_sb = nfs_xdev_get_sb,
f7b422b1 258 .kill_sb = nfs_kill_super,
349457cc 259 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 260};
261
ee9b6d61 262static const struct super_operations nfs_sops = {
f7b422b1
DH		 263 .alloc_inode = nfs_alloc_inode,
264 .destroy_inode = nfs_destroy_inode,
265 .write_inode = nfs_write_inode,
266 .statfs = nfs_statfs,
267 .clear_inode = nfs_clear_inode,
268 .umount_begin = nfs_umount_begin,
269 .show_options = nfs_show_options,
270 .show_stats = nfs_show_stats,
48b605f8 271 .remount_fs = nfs_remount,
f7b422b1
DH		 272};
273
274#ifdef CONFIG_NFS_V4
7630c852
CL		 275static int nfs4_validate_text_mount_data(void *options,
276 struct nfs_parsed_mount_data *args, const char *dev_name);
816724e6
TM		 277static int nfs4_get_sb(struct file_system_type *fs_type,
278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 279static int nfs4_remote_get_sb(struct file_system_type *fs_type,
280 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 281static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
282 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
283static int nfs4_referral_get_sb(struct file_system_type *fs_type,
284 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 285static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
286 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 287static void nfs4_kill_super(struct super_block *sb);
288
289static struct file_system_type nfs4_fs_type = {
290 .owner = THIS_MODULE,
291 .name = "nfs4",
292 .get_sb = nfs4_get_sb,
293 .kill_sb = nfs4_kill_super,
349457cc 294 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 295};
296
c02d7adf
TM		 297static struct file_system_type nfs4_remote_fs_type = {
298 .owner = THIS_MODULE,
299 .name = "nfs4",
300 .get_sb = nfs4_remote_get_sb,
301 .kill_sb = nfs4_kill_super,
302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
303};
304
54ceac45 305struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 306 .owner = THIS_MODULE,
307 .name = "nfs4",
54ceac45 308 .get_sb = nfs4_xdev_get_sb,
f7b422b1 309 .kill_sb = nfs4_kill_super,
349457cc 310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 311};
312
c02d7adf
TM		 313static struct file_system_type nfs4_remote_referral_fs_type = {
314 .owner = THIS_MODULE,
315 .name = "nfs4",
316 .get_sb = nfs4_remote_referral_get_sb,
317 .kill_sb = nfs4_kill_super,
318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
319};
320
54ceac45 321struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 322 .owner = THIS_MODULE,
323 .name = "nfs4",
54ceac45 324 .get_sb = nfs4_referral_get_sb,
f7b422b1 325 .kill_sb = nfs4_kill_super,
349457cc 326 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 327};
328
ee9b6d61 329static const struct super_operations nfs4_sops = {
f7b422b1
DH		 330 .alloc_inode = nfs_alloc_inode,
331 .destroy_inode = nfs_destroy_inode,
332 .write_inode = nfs_write_inode,
333 .statfs = nfs_statfs,
334 .clear_inode = nfs4_clear_inode,
335 .umount_begin = nfs_umount_begin,
336 .show_options = nfs_show_options,
337 .show_stats = nfs_show_stats,
48b605f8 338 .remount_fs = nfs_remount,
f7b422b1
DH		 339};
340#endif
341
8e1f936b
RR		 342static struct shrinker acl_shrinker = {
343 .shrink = nfs_access_cache_shrinker,
344 .seeks = DEFAULT_SEEKS,
345};
979df72e 346
f7b422b1
DH		 347/*
348 * Register the NFS filesystems
349 */
350int __init register_nfs_fs(void)
351{
352 int ret;
353
354 ret = register_filesystem(&nfs_fs_type);
355 if (ret < 0)
356 goto error_0;
357
f7b422b1
DH		 358 ret = nfs_register_sysctl();
359 if (ret < 0)
360 goto error_1;
89a09141 361#ifdef CONFIG_NFS_V4
f7b422b1
DH		 362 ret = register_filesystem(&nfs4_fs_type);
363 if (ret < 0)
364 goto error_2;
365#endif
8e1f936b 366 register_shrinker(&acl_shrinker);
f7b422b1
DH		 367 return 0;
368
369#ifdef CONFIG_NFS_V4
370error_2:
371 nfs_unregister_sysctl();
89a09141 372#endif
f7b422b1
DH		 373error_1:
374 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 375error_0:
376 return ret;
377}
378
379/*
380 * Unregister the NFS filesystems
381 */
382void __exit unregister_nfs_fs(void)
383{
8e1f936b 384 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 385#ifdef CONFIG_NFS_V4
386 unregister_filesystem(&nfs4_fs_type);
f7b422b1 387#endif
49af7ee1 388 nfs_unregister_sysctl();
f7b422b1
DH		 389 unregister_filesystem(&nfs_fs_type);
390}
391
1daef0a8 392void nfs_sb_active(struct super_block *sb)
ef818a28 393{
1daef0a8 394 struct nfs_server *server = NFS_SB(sb);
ef818a28 395
1daef0a8
TM		 396 if (atomic_inc_return(&server->active) == 1)
397 atomic_inc(&sb->s_active);
ef818a28
SD		 398}
399
1daef0a8 400void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 401{
402 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 403
404 if (atomic_dec_and_test(&server->active))
405 deactivate_super(sb);
ef818a28
SD		 406}
407
f7b422b1
DH		 408/*
409 * Deliver file system statistics to userspace
410 */
816724e6 411static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 412{
0c7d90cf 413 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 414 unsigned char blockbits;
415 unsigned long blockres;
0c7d90cf 416 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 417 struct nfs_fattr fattr;
418 struct nfs_fsstat res = {
419 .fattr = &fattr,
420 };
421 int error;
422
8fa5c000 423 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 424 if (error < 0)
425 goto out_err;
1a0ba9ae 426 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 427
428 /*
429 * Current versions of glibc do not correctly handle the
430 * case where f_frsize != f_bsize. Eventually we want to
431 * report the value of wtmult in this field.
432 */
0c7d90cf 433 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 434
435 /*
436 * On most *nix systems, f_blocks, f_bfree, and f_bavail
437 * are reported in units of f_frsize. Linux hasn't had
438 * an f_frsize field in its statfs struct until recently,
439 * thus historically Linux's sys_statfs reports these
440 * fields in units of f_bsize.
441 */
0c7d90cf
DH		 442 buf->f_bsize = dentry->d_sb->s_blocksize;
443 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 444 blockres = (1 << blockbits) - 1;
445 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
446 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
447 buf->f_bavail = (res.abytes + blockres) >> blockbits;
448
449 buf->f_files = res.tfiles;
450 buf->f_ffree = res.afiles;
451
452 buf->f_namelen = server->namelen;
1a0ba9ae 453
f7b422b1
DH		 454 return 0;
455
456 out_err:
3110ff80 457 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 458 return error;
f7b422b1
DH		 459}
460
7d4e2747
DH		 461/*
462 * Map the security flavour number to a name
463 */
81039f1f
TM		 464static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
465{
7d4e2747 466 static const struct {
81039f1f
TM		 467 rpc_authflavor_t flavour;
468 const char *str;
469 } sec_flavours[] = {
470 { RPC_AUTH_NULL, "null" },
471 { RPC_AUTH_UNIX, "sys" },
472 { RPC_AUTH_GSS_KRB5, "krb5" },
473 { RPC_AUTH_GSS_KRB5I, "krb5i" },
474 { RPC_AUTH_GSS_KRB5P, "krb5p" },
475 { RPC_AUTH_GSS_LKEY, "lkey" },
476 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
477 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
478 { RPC_AUTH_GSS_SPKM, "spkm" },
479 { RPC_AUTH_GSS_SPKMI, "spkmi" },
480 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 481 { UINT_MAX, "unknown" }
81039f1f
TM		 482 };
483 int i;
484
4d81cd16 485 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 486 if (sec_flavours[i].flavour == flavour)
487 break;
488 }
489 return sec_flavours[i].str;
490}
491
82d101d5
CL		 492static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
493 int showdefaults)
494{
495 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
496
497 switch (sap->sa_family) {
498 case AF_INET: {
499 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 500 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 501 break;
502 }
503 case AF_INET6: {
504 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
5b095d98 505 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
82d101d5
CL		 506 break;
507 }
508 default:
509 if (showdefaults)
510 seq_printf(m, ",mountaddr=unspecified");
511 }
512
513 if (nfss->mountd_version || showdefaults)
514 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
515 if (nfss->mountd_port || showdefaults)
516 seq_printf(m, ",mountport=%u", nfss->mountd_port);
517
518 switch (nfss->mountd_protocol) {
519 case IPPROTO_UDP:
520 seq_printf(m, ",mountproto=udp");
521 break;
522 case IPPROTO_TCP:
523 seq_printf(m, ",mountproto=tcp");
524 break;
525 default:
526 if (showdefaults)
527 seq_printf(m, ",mountproto=auto");
528 }
529}
530
f7b422b1
DH		 531/*
532 * Describe the mount options in force on this server representation
533 */
82d101d5
CL		 534static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
535 int showdefaults)
f7b422b1 536{
509de811 537 static const struct proc_nfs_info {
f7b422b1 538 int flag;
509de811
DH		 539 const char *str;
540 const char *nostr;
f7b422b1
DH		 541 } nfs_info[] = {
542 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 543 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 544 { NFS_MOUNT_NOCTO, ",nocto", "" },
545 { NFS_MOUNT_NOAC, ",noac", "" },
546 { NFS_MOUNT_NONLM, ",nolock", "" },
547 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 548 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 549 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
550 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 551 { 0, NULL, NULL }
552 };
509de811 553 const struct proc_nfs_info *nfs_infop;
8fa5c000 554 struct nfs_client *clp = nfss->nfs_client;
82d101d5 555 u32 version = clp->rpc_ops->version;
f7b422b1 556
82d101d5 557 seq_printf(m, ",vers=%u", version);
2d767432
CL		 558 seq_printf(m, ",rsize=%u", nfss->rsize);
559 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 560 if (nfss->bsize != 0)
561 seq_printf(m, ",bsize=%u", nfss->bsize);
562 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 563 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 564 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 565 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 566 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 567 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 568 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 569 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 570 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 571 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
572 if (nfss->flags & nfs_infop->flag)
573 seq_puts(m, nfs_infop->str);
574 else
575 seq_puts(m, nfs_infop->nostr);
576 }
56928edd
TT		 577 seq_printf(m, ",proto=%s",
578 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 579 if (version == 4) {
580 if (nfss->port != NFS_PORT)
581 seq_printf(m, ",port=%u", nfss->port);
582 } else
583 if (nfss->port)
584 seq_printf(m, ",port=%u", nfss->port);
585
33170233
TM		 586 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
587 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 588 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 589
590 if (version != 4)
591 nfs_show_mountd_options(m, nfss, showdefaults);
592
593#ifdef CONFIG_NFS_V4
594 if (clp->rpc_ops->version == 4)
595 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
596#endif
b797cac7
DH		 597 if (nfss->options & NFS_OPTION_FSCACHE)
598 seq_printf(m, ",fsc");
f7b422b1
DH		 599}
600
601/*
602 * Describe the mount options on this VFS mountpoint
603 */
604static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
605{
606 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
607
608 nfs_show_mount_options(m, nfss, 0);
609
5d8515ca
CL		 610 seq_printf(m, ",addr=%s",
611 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
612 RPC_DISPLAY_ADDR));
f7b422b1
DH		 613
614 return 0;
615}
616
617/*
618 * Present statistical information for this VFS mountpoint
619 */
620static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
621{
622 int i, cpu;
623 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
624 struct rpc_auth *auth = nfss->client->cl_auth;
625 struct nfs_iostats totals = { };
626
627 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
628
629 /*
630 * Display all mount option settings
631 */
632 seq_printf(m, "\n\topts:\t");
633 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
634 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
635 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
636 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
637 nfs_show_mount_options(m, nfss, 1);
638
639 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
640
641 seq_printf(m, "\n\tcaps:\t");
642 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 643 seq_printf(m, ",wtmult=%u", nfss->wtmult);
644 seq_printf(m, ",dtsize=%u", nfss->dtsize);
645 seq_printf(m, ",bsize=%u", nfss->bsize);
646 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 647
648#ifdef CONFIG_NFS_V4
40c55319 649 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 650 seq_printf(m, "\n\tnfsv4:\t");
651 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
652 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
653 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
654 }
655#endif
656
657 /*
658 * Display security flavor in effect for this mount
659 */
2d767432 660 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 661 if (auth->au_flavor)
2d767432 662 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 663
664 /*
665 * Display superblock I/O counters
666 */
667 for_each_possible_cpu(cpu) {
668 struct nfs_iostats *stats;
669
670 preempt_disable();
671 stats = per_cpu_ptr(nfss->io_stats, cpu);
672
673 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
674 totals.events[i] += stats->events[i];
675 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
676 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 677#ifdef CONFIG_NFS_FSCACHE
678 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
679 totals.fscache[i] += stats->fscache[i];
680#endif
f7b422b1
DH		 681
682 preempt_enable();
683 }
684
685 seq_printf(m, "\n\tevents:\t");
686 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
687 seq_printf(m, "%lu ", totals.events[i]);
688 seq_printf(m, "\n\tbytes:\t");
689 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
690 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 691#ifdef CONFIG_NFS_FSCACHE
692 if (nfss->options & NFS_OPTION_FSCACHE) {
693 seq_printf(m, "\n\tfsc:\t");
694 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
695 seq_printf(m, "%Lu ", totals.bytes[i]);
696 }
697#endif
f7b422b1
DH		 698 seq_printf(m, "\n");
699
700 rpc_print_iostats(m, nfss->client);
701
702 return 0;
703}
704
705/*
706 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 707 * in response to xdev traversals and referrals
f7b422b1 708 */
42faad99 709static void nfs_umount_begin(struct super_block *sb)
f7b422b1 710{
67e55205 711 struct nfs_server *server;
fc6ae3cf
TM		 712 struct rpc_clnt *rpc;
713
67e55205
AIB		 714 lock_kernel();
715
716 server = NFS_SB(sb);
fc6ae3cf
TM		 717 /* -EIO all pending I/O */
718 rpc = server->client_acl;
719 if (!IS_ERR(rpc))
720 rpc_killall_tasks(rpc);
721 rpc = server->client;
722 if (!IS_ERR(rpc))
723 rpc_killall_tasks(rpc);
67e55205
AIB		 724
725 unlock_kernel();
f7b422b1
DH		 726}
727
fc50d58f 728/*
cdcd7f9a
CL		 729 * Sanity-check a server address provided by the mount command.
730 *
731 * Address family must be initialized, and address must not be
732 * the ANY address for that family.
fc50d58f
CL		 733 */
734static int nfs_verify_server_address(struct sockaddr *addr)
735{
736 switch (addr->sa_family) {
737 case AF_INET: {
cdcd7f9a 738 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 739 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 740 }
741 case AF_INET6: {
742 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
743 return !ipv6_addr_any(sa);
fc50d58f
CL		 744 }
745 }
746
53a0b9c4 747 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 748 return 0;
749}
750
4cfd74fc
CL		 751/*
752 * Select between a default port value and a user-specified port value.
753 * If a zero value is set, then autobind will be used.
754 */
755static void nfs_set_default_port(struct sockaddr *sap, const int parsed_port,
756 const unsigned short default_port)
757{
758 unsigned short port = default_port;
759
760 if (parsed_port != NFS_UNSPEC_PORT)
761 port = parsed_port;
762
763 rpc_set_port(sap, port);
764}
765
259875ef
TM		 766/*
767 * Sanity check the NFS transport protocol.
768 *
769 */
770static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
771{
772 switch (mnt->nfs_server.protocol) {
773 case XPRT_TRANSPORT_UDP:
774 case XPRT_TRANSPORT_TCP:
775 case XPRT_TRANSPORT_RDMA:
776 break;
777 default:
778 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
779 }
780}
781
782/*
783 * For text based NFSv2/v3 mounts, the mount protocol transport default
784 * settings should depend upon the specified NFS transport.
785 */
786static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
787{
788 nfs_validate_transport_protocol(mnt);
789
790 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
791 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
792 return;
793 switch (mnt->nfs_server.protocol) {
794 case XPRT_TRANSPORT_UDP:
795 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
796 break;
797 case XPRT_TRANSPORT_TCP:
798 case XPRT_TRANSPORT_RDMA:
799 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
800 }
801}
802
01060c89
CL		 803/*
804 * Parse the value of the 'sec=' option.
01060c89
CL		 805 */
806static int nfs_parse_security_flavors(char *value,
807 struct nfs_parsed_mount_data *mnt)
808{
809 substring_t args[MAX_OPT_ARGS];
810
811 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
812
813 switch (match_token(value, nfs_secflavor_tokens, args)) {
814 case Opt_sec_none:
01060c89
CL		 815 mnt->auth_flavors[0] = RPC_AUTH_NULL;
816 break;
817 case Opt_sec_sys:
01060c89
CL		 818 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
819 break;
820 case Opt_sec_krb5:
01060c89
CL		 821 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
822 break;
823 case Opt_sec_krb5i:
01060c89
CL		 824 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
825 break;
826 case Opt_sec_krb5p:
01060c89
CL		 827 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
828 break;
829 case Opt_sec_lkey:
01060c89
CL		 830 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
831 break;
832 case Opt_sec_lkeyi:
01060c89
CL		 833 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
834 break;
835 case Opt_sec_lkeyp:
01060c89
CL		 836 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
837 break;
838 case Opt_sec_spkm:
01060c89
CL		 839 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
840 break;
841 case Opt_sec_spkmi:
01060c89
CL		 842 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
843 break;
844 case Opt_sec_spkmp:
01060c89
CL		 845 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
846 break;
847 default:
848 return 0;
849 }
850
059f90b3 851 mnt->auth_flavor_len = 1;
01060c89
CL		 852 return 1;
853}
854
bf0fd768
CL		 855/*
856 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 857 * a data structure. The whole mount string is processed; bad options are
858 * skipped as they are encountered. If there were no errors, return 1;
859 * otherwise return 0 (zero).
bf0fd768
CL		 860 */
861static int nfs_parse_mount_options(char *raw,
862 struct nfs_parsed_mount_data *mnt)
863{
f9c3a380 864 char *p, *string, *secdata;
d23c45fd 865 int rc, sloppy = 0, invalid_option = 0;
bf0fd768
CL		 866
867 if (!raw) {
868 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
869 return 1;
870 }
871 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
872
f9c3a380
EP		 873 secdata = alloc_secdata();
874 if (!secdata)
875 goto out_nomem;
876
877 rc = security_sb_copy_data(raw, secdata);
878 if (rc)
879 goto out_security_failure;
880
881 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
882 if (rc)
883 goto out_security_failure;
884
885 free_secdata(secdata);
886
bf0fd768
CL		 887 while ((p = strsep(&raw, ",")) != NULL) {
888 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 889 unsigned long option;
890 int token;
bf0fd768
CL		 891
892 if (!*p)
893 continue;
894
895 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
896
897 token = match_token(p, nfs_mount_option_tokens, args);
898 switch (token) {
f45663ce
CL		 899
900 /*
901 * boolean options: foo/nofoo
902 */
bf0fd768
CL		 903 case Opt_soft:
904 mnt->flags |= NFS_MOUNT_SOFT;
905 break;
906 case Opt_hard:
907 mnt->flags &= ~NFS_MOUNT_SOFT;
908 break;
bf0fd768
CL		 909 case Opt_posix:
910 mnt->flags |= NFS_MOUNT_POSIX;
911 break;
912 case Opt_noposix:
913 mnt->flags &= ~NFS_MOUNT_POSIX;
914 break;
915 case Opt_cto:
916 mnt->flags &= ~NFS_MOUNT_NOCTO;
917 break;
918 case Opt_nocto:
919 mnt->flags |= NFS_MOUNT_NOCTO;
920 break;
921 case Opt_ac:
922 mnt->flags &= ~NFS_MOUNT_NOAC;
923 break;
924 case Opt_noac:
925 mnt->flags |= NFS_MOUNT_NOAC;
926 break;
927 case Opt_lock:
928 mnt->flags &= ~NFS_MOUNT_NONLM;
929 break;
930 case Opt_nolock:
931 mnt->flags |= NFS_MOUNT_NONLM;
932 break;
933 case Opt_v2:
934 mnt->flags &= ~NFS_MOUNT_VER3;
935 break;
936 case Opt_v3:
937 mnt->flags |= NFS_MOUNT_VER3;
938 break;
939 case Opt_udp:
940 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 941 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 942 break;
943 case Opt_tcp:
944 mnt->flags |= NFS_MOUNT_TCP;
0896a725 945 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 946 break;
2cf7ff7a
TT		 947 case Opt_rdma:
948 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
949 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 950 xprt_load_transport(p);
2cf7ff7a 951 break;
bf0fd768
CL		 952 case Opt_acl:
953 mnt->flags &= ~NFS_MOUNT_NOACL;
954 break;
955 case Opt_noacl:
956 mnt->flags |= NFS_MOUNT_NOACL;
957 break;
958 case Opt_rdirplus:
959 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
960 break;
961 case Opt_nordirplus:
962 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
963 break;
75180df2
TM		 964 case Opt_sharecache:
965 mnt->flags &= ~NFS_MOUNT_UNSHARED;
966 break;
967 case Opt_nosharecache:
968 mnt->flags |= NFS_MOUNT_UNSHARED;
969 break;
d740351b
CL		 970 case Opt_resvport:
971 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
972 break;
973 case Opt_noresvport:
974 mnt->flags |= NFS_MOUNT_NORESVPORT;
975 break;
b797cac7
DH		 976 case Opt_fscache:
977 mnt->options |= NFS_OPTION_FSCACHE;
978 kfree(mnt->fscache_uniq);
979 mnt->fscache_uniq = NULL;
980 break;
981 case Opt_nofscache:
982 mnt->options &= ~NFS_OPTION_FSCACHE;
983 kfree(mnt->fscache_uniq);
984 mnt->fscache_uniq = NULL;
985 break;
986 case Opt_fscache_uniq:
987 string = match_strdup(args);
988 if (!string)
989 goto out_nomem;
990 kfree(mnt->fscache_uniq);
991 mnt->fscache_uniq = string;
992 mnt->options |= NFS_OPTION_FSCACHE;
993 break;
bf0fd768 994
f45663ce
CL		 995 /*
996 * options that take numeric values
997 */
bf0fd768 998 case Opt_port:
a5a16bae
CL		 999 string = match_strdup(args);
1000 if (string == NULL)
1001 goto out_nomem;
1002 rc = strict_strtoul(string, 10, &option);
1003 kfree(string);
1004 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1005 goto out_invalid_value;
1006 mnt->nfs_server.port = option;
bf0fd768
CL		 1007 break;
1008 case Opt_rsize:
a5a16bae
CL		 1009 string = match_strdup(args);
1010 if (string == NULL)
1011 goto out_nomem;
1012 rc = strict_strtoul(string, 10, &option);
1013 kfree(string);
1014 if (rc != 0)
d23c45fd
CL		 1015 goto out_invalid_value;
1016 mnt->rsize = option;
bf0fd768
CL		 1017 break;
1018 case Opt_wsize:
a5a16bae
CL		 1019 string = match_strdup(args);
1020 if (string == NULL)
1021 goto out_nomem;
1022 rc = strict_strtoul(string, 10, &option);
1023 kfree(string);
1024 if (rc != 0)
d23c45fd
CL		 1025 goto out_invalid_value;
1026 mnt->wsize = option;
bf0fd768
CL		 1027 break;
1028 case Opt_bsize:
a5a16bae
CL		 1029 string = match_strdup(args);
1030 if (string == NULL)
1031 goto out_nomem;
1032 rc = strict_strtoul(string, 10, &option);
1033 kfree(string);
1034 if (rc != 0)
d23c45fd
CL		 1035 goto out_invalid_value;
1036 mnt->bsize = option;
bf0fd768
CL		 1037 break;
1038 case Opt_timeo:
a5a16bae
CL		 1039 string = match_strdup(args);
1040 if (string == NULL)
1041 goto out_nomem;
1042 rc = strict_strtoul(string, 10, &option);
1043 kfree(string);
1044 if (rc != 0 || option == 0)
d23c45fd
CL		 1045 goto out_invalid_value;
1046 mnt->timeo = option;
bf0fd768
CL		 1047 break;
1048 case Opt_retrans:
a5a16bae
CL		 1049 string = match_strdup(args);
1050 if (string == NULL)
1051 goto out_nomem;
1052 rc = strict_strtoul(string, 10, &option);
1053 kfree(string);
1054 if (rc != 0 || option == 0)
d23c45fd
CL		 1055 goto out_invalid_value;
1056 mnt->retrans = option;
bf0fd768
CL		 1057 break;
1058 case Opt_acregmin:
a5a16bae
CL		 1059 string = match_strdup(args);
1060 if (string == NULL)
1061 goto out_nomem;
1062 rc = strict_strtoul(string, 10, &option);
1063 kfree(string);
1064 if (rc != 0)
d23c45fd
CL		 1065 goto out_invalid_value;
1066 mnt->acregmin = option;
bf0fd768
CL		 1067 break;
1068 case Opt_acregmax:
a5a16bae
CL		 1069 string = match_strdup(args);
1070 if (string == NULL)
1071 goto out_nomem;
1072 rc = strict_strtoul(string, 10, &option);
1073 kfree(string);
1074 if (rc != 0)
d23c45fd
CL		 1075 goto out_invalid_value;
1076 mnt->acregmax = option;
bf0fd768
CL		 1077 break;
1078 case Opt_acdirmin:
a5a16bae
CL		 1079 string = match_strdup(args);
1080 if (string == NULL)
1081 goto out_nomem;
1082 rc = strict_strtoul(string, 10, &option);
1083 kfree(string);
1084 if (rc != 0)
d23c45fd
CL		 1085 goto out_invalid_value;
1086 mnt->acdirmin = option;
bf0fd768
CL		 1087 break;
1088 case Opt_acdirmax:
a5a16bae
CL		 1089 string = match_strdup(args);
1090 if (string == NULL)
1091 goto out_nomem;
1092 rc = strict_strtoul(string, 10, &option);
1093 kfree(string);
1094 if (rc != 0)
d23c45fd
CL		 1095 goto out_invalid_value;
1096 mnt->acdirmax = option;
bf0fd768
CL		 1097 break;
1098 case Opt_actimeo:
a5a16bae
CL		 1099 string = match_strdup(args);
1100 if (string == NULL)
1101 goto out_nomem;
1102 rc = strict_strtoul(string, 10, &option);
1103 kfree(string);
1104 if (rc != 0)
d23c45fd
CL		 1105 goto out_invalid_value;
1106 mnt->acregmin = mnt->acregmax =
1107 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1108 break;
1109 case Opt_namelen:
a5a16bae
CL		 1110 string = match_strdup(args);
1111 if (string == NULL)
1112 goto out_nomem;
1113 rc = strict_strtoul(string, 10, &option);
1114 kfree(string);
1115 if (rc != 0)
d23c45fd
CL		 1116 goto out_invalid_value;
1117 mnt->namlen = option;
bf0fd768
CL		 1118 break;
1119 case Opt_mountport:
a5a16bae
CL		 1120 string = match_strdup(args);
1121 if (string == NULL)
1122 goto out_nomem;
1123 rc = strict_strtoul(string, 10, &option);
1124 kfree(string);
1125 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1126 goto out_invalid_value;
1127 mnt->mount_server.port = option;
bf0fd768 1128 break;
bf0fd768 1129 case Opt_mountvers:
a5a16bae
CL		 1130 string = match_strdup(args);
1131 if (string == NULL)
1132 goto out_nomem;
1133 rc = strict_strtoul(string, 10, &option);
1134 kfree(string);
1135 if (rc != 0 ||
f45663ce 1136 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1137 option > NFS_MNT3_VERSION)
1138 goto out_invalid_value;
1139 mnt->mount_server.version = option;
bf0fd768 1140 break;
bf0fd768 1141 case Opt_nfsvers:
a5a16bae
CL		 1142 string = match_strdup(args);
1143 if (string == NULL)
1144 goto out_nomem;
1145 rc = strict_strtoul(string, 10, &option);
1146 kfree(string);
1147 if (rc != 0)
d23c45fd 1148 goto out_invalid_value;
bf0fd768 1149 switch (option) {
f45663ce 1150 case NFS2_VERSION:
bf0fd768
CL		 1151 mnt->flags &= ~NFS_MOUNT_VER3;
1152 break;
f45663ce 1153 case NFS3_VERSION:
bf0fd768
CL		 1154 mnt->flags |= NFS_MOUNT_VER3;
1155 break;
1156 default:
d23c45fd 1157 goto out_invalid_value;
bf0fd768
CL		 1158 }
1159 break;
3fd5be9e 1160 case Opt_minorversion:
f3f4f4ed
CL		 1161 string = match_strdup(args);
1162 if (string == NULL)
1163 goto out_nomem;
1164 rc = strict_strtoul(string, 10, &option);
1165 kfree(string);
1166 if (rc != 0)
1167 goto out_invalid_value;
1168 if (option > NFS4_MAX_MINOR_VERSION)
1169 goto out_invalid_value;
1170 mnt->minorversion = option;
3fd5be9e 1171 break;
bf0fd768 1172
f45663ce
CL		 1173 /*
1174 * options that take text values
1175 */
bf0fd768
CL		 1176 case Opt_sec:
1177 string = match_strdup(args);
1178 if (string == NULL)
1179 goto out_nomem;
01060c89 1180 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1181 kfree(string);
f45663ce 1182 if (!rc) {
f45663ce
CL		 1183 dfprintk(MOUNT, "NFS: unrecognized "
1184 "security flavor\n");
d23c45fd 1185 return 0;
f45663ce 1186 }
bf0fd768
CL		 1187 break;
1188 case Opt_proto:
1189 string = match_strdup(args);
1190 if (string == NULL)
1191 goto out_nomem;
1192 token = match_token(string,
1193 nfs_xprt_protocol_tokens, args);
bf0fd768
CL		 1194
1195 switch (token) {
fdb66ff4 1196 case Opt_xprt_udp:
bf0fd768 1197 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1198 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1199 kfree(string);
bf0fd768 1200 break;
fdb66ff4 1201 case Opt_xprt_tcp:
bf0fd768 1202 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1203 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1204 kfree(string);
bf0fd768 1205 break;
2cf7ff7a
TT		 1206 case Opt_xprt_rdma:
1207 /* vector side protocols to TCP */
1208 mnt->flags |= NFS_MOUNT_TCP;
1209 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1210 xprt_load_transport(string);
d23c45fd 1211 kfree(string);
2cf7ff7a 1212 break;
bf0fd768 1213 default:
f45663ce
CL		 1214 dfprintk(MOUNT, "NFS: unrecognized "
1215 "transport protocol\n");
d23c45fd 1216 return 0;
bf0fd768
CL		 1217 }
1218 break;
1219 case Opt_mountproto:
1220 string = match_strdup(args);
1221 if (string == NULL)
1222 goto out_nomem;
1223 token = match_token(string,
1224 nfs_xprt_protocol_tokens, args);
d508afb4 1225 kfree(string);
bf0fd768
CL		 1226
1227 switch (token) {
fdb66ff4 1228 case Opt_xprt_udp:
0896a725 1229 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1230 break;
fdb66ff4 1231 case Opt_xprt_tcp:
0896a725 1232 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1233 break;
2cf7ff7a 1234 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1235 default:
f45663ce
CL		 1236 dfprintk(MOUNT, "NFS: unrecognized "
1237 "transport protocol\n");
d23c45fd 1238 return 0;
bf0fd768
CL		 1239 }
1240 break;
1241 case Opt_addr:
1242 string = match_strdup(args);
1243 if (string == NULL)
1244 goto out_nomem;
53a0b9c4
CL		 1245 mnt->nfs_server.addrlen =
1246 rpc_pton(string, strlen(string),
1247 (struct sockaddr *)
1248 &mnt->nfs_server.address,
1249 sizeof(mnt->nfs_server.address));
bf0fd768 1250 kfree(string);
53a0b9c4
CL		 1251 if (mnt->nfs_server.addrlen == 0)
1252 goto out_invalid_address;
bf0fd768
CL		 1253 break;
1254 case Opt_clientaddr:
1255 string = match_strdup(args);
1256 if (string == NULL)
1257 goto out_nomem;
fc601477 1258 kfree(mnt->client_address);
bf0fd768
CL		 1259 mnt->client_address = string;
1260 break;
33832034
CL		 1261 case Opt_mounthost:
1262 string = match_strdup(args);
1263 if (string == NULL)
1264 goto out_nomem;
fc601477 1265 kfree(mnt->mount_server.hostname);
33832034
CL		 1266 mnt->mount_server.hostname = string;
1267 break;
0ac83779 1268 case Opt_mountaddr:
bf0fd768
CL		 1269 string = match_strdup(args);
1270 if (string == NULL)
1271 goto out_nomem;
53a0b9c4
CL		 1272 mnt->mount_server.addrlen =
1273 rpc_pton(string, strlen(string),
1274 (struct sockaddr *)
1275 &mnt->mount_server.address,
1276 sizeof(mnt->mount_server.address));
bf0fd768 1277 kfree(string);
53a0b9c4
CL		 1278 if (mnt->mount_server.addrlen == 0)
1279 goto out_invalid_address;
bf0fd768 1280 break;
7973c1f1
TM		 1281 case Opt_lookupcache:
1282 string = match_strdup(args);
1283 if (string == NULL)
1284 goto out_nomem;
1285 token = match_token(string,
1286 nfs_lookupcache_tokens, args);
1287 kfree(string);
1288 switch (token) {
1289 case Opt_lookupcache_all:
1290 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1291 break;
1292 case Opt_lookupcache_positive:
1293 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1294 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1295 break;
1296 case Opt_lookupcache_none:
1297 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1298 break;
1299 default:
7973c1f1
TM		 1300 dfprintk(MOUNT, "NFS: invalid "
1301 "lookupcache argument\n");
d23c45fd 1302 return 0;
7973c1f1
TM		 1303 };
1304 break;
bf0fd768 1305
f45663ce
CL		 1306 /*
1307 * Special options
1308 */
1309 case Opt_sloppy:
1310 sloppy = 1;
1311 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1312 break;
bf0fd768
CL		 1313 case Opt_userspace:
1314 case Opt_deprecated:
d33e4dfe
CL		 1315 dfprintk(MOUNT, "NFS: ignoring mount option "
1316 "'%s'\n", p);
bf0fd768
CL		 1317 break;
1318
1319 default:
d23c45fd 1320 invalid_option = 1;
f45663ce
CL		 1321 dfprintk(MOUNT, "NFS: unrecognized mount option "
1322 "'%s'\n", p);
bf0fd768
CL		 1323 }
1324 }
1325
d23c45fd
CL		 1326 if (!sloppy && invalid_option)
1327 return 0;
1328
bf0fd768
CL		 1329 return 1;
1330
53a0b9c4
CL		 1331out_invalid_address:
1332 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1333 return 0;
d23c45fd 1334out_invalid_value:
53a0b9c4 1335 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1336 return 0;
bf0fd768
CL		 1337out_nomem:
1338 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1339 return 0;
f9c3a380
EP		 1340out_security_failure:
1341 free_secdata(secdata);
1342 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1343 return 0;
bf0fd768
CL		 1344}
1345
ec88f28d
CL		 1346/*
1347 * Match the requested auth flavors with the list returned by
1348 * the server. Returns zero and sets the mount's authentication
1349 * flavor on success; returns -EACCES if server does not support
1350 * the requested flavor.
1351 */
1352static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1353 struct nfs_mount_request *request)
1354{
1355 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1356
5eecfde6
CL		 1357 /*
1358 * Certain releases of Linux's mountd return an empty
1359 * flavor list. To prevent behavioral regression with
1360 * these servers (ie. rejecting mounts that used to
1361 * succeed), revert to pre-2.6.32 behavior (no checking)
1362 * if the returned flavor list is empty.
1363 */
1364 if (server_authlist_len == 0)
1365 return 0;
1366
ec88f28d
CL		 1367 /*
1368 * We avoid sophisticated negotiating here, as there are
1369 * plenty of cases where we can get it wrong, providing
1370 * either too little or too much security.
1371 *
1372 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1373 * flavor listed first. However, some servers list
1374 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1375 * preferred default, in args->auth_flavors[0] if user
1376 * didn't specify sec= mount option.
1377 */
1378 for (i = 0; i < args->auth_flavor_len; i++)
1379 for (j = 0; j < server_authlist_len; j++)
1380 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1381 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1382 request->auth_flavs[j]);
1383 args->auth_flavors[0] = request->auth_flavs[j];
1384 return 0;
1385 }
1386
1387 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1388 nfs_umount(request);
1389 return -EACCES;
1390}
1391
0076d7b7
CL		 1392/*
1393 * Use the remote server's MOUNT service to request the NFS file handle
1394 * corresponding to the provided path.
1395 */
1396static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1397 struct nfs_fh *root_fh)
1398{
ec88f28d
CL		 1399 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1400 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1401 struct nfs_mount_request request = {
1402 .sap = (struct sockaddr *)
1403 &args->mount_server.address,
1404 .dirpath = args->nfs_server.export_path,
1405 .protocol = args->mount_server.protocol,
1406 .fh = root_fh,
50a737f8 1407 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1408 .auth_flav_len = &server_authlist_len,
1409 .auth_flavs = server_authlist,
c5d120f8 1410 };
4c568017 1411 int status;
0076d7b7
CL		 1412
1413 if (args->mount_server.version == 0) {
1414 if (args->flags & NFS_MOUNT_VER3)
1415 args->mount_server.version = NFS_MNT3_VERSION;
1416 else
1417 args->mount_server.version = NFS_MNT_VERSION;
1418 }
c5d120f8 1419 request.version = args->mount_server.version;
0076d7b7 1420
33832034 1421 if (args->mount_server.hostname)
c5d120f8 1422 request.hostname = args->mount_server.hostname;
33832034 1423 else
c5d120f8 1424 request.hostname = args->nfs_server.hostname;
33832034 1425
0076d7b7
CL		 1426 /*
1427 * Construct the mount server's address.
1428 */
4c568017 1429 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1430 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1431 args->nfs_server.addrlen);
1432 args->mount_server.addrlen = args->nfs_server.addrlen;
1433 }
c5d120f8 1434 request.salen = args->mount_server.addrlen;
4cfd74fc 1435 nfs_set_default_port(request.sap, args->mount_server.port, 0);
0076d7b7
CL		 1436
1437 /*
1438 * Now ask the mount server to map our export path
1439 * to a file handle.
1440 */
c5d120f8 1441 status = nfs_mount(&request);
ec88f28d
CL		 1442 if (status != 0) {
1443 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1444 request.hostname, status);
1445 return status;
1446 }
0076d7b7 1447
ec88f28d
CL		 1448 /*
1449 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1450 */
1451 if (args->mount_server.version != NFS_MNT3_VERSION)
1452 return 0;
1453 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1454}
1455
d1aa0825
CL		 1456static int nfs_parse_simple_hostname(const char *dev_name,
1457 char **hostname, size_t maxnamlen,
1458 char **export_path, size_t maxpathlen)
dc045898
CL		 1459{
1460 size_t len;
1461 char *colon, *comma;
1462
1463 colon = strchr(dev_name, ':');
1464 if (colon == NULL)
1465 goto out_bad_devname;
1466
1467 len = colon - dev_name;
1468 if (len > maxnamlen)
1469 goto out_hostname;
1470
1471 /* N.B. caller will free nfs_server.hostname in all cases */
1472 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1473 if (!*hostname)
1474 goto out_nomem;
1475
1476 /* kill possible hostname list: not supported */
1477 comma = strchr(*hostname, ',');
1478 if (comma != NULL) {
1479 if (comma == *hostname)
1480 goto out_bad_devname;
1481 *comma = '\0';
1482 }
1483
1484 colon++;
1485 len = strlen(colon);
1486 if (len > maxpathlen)
1487 goto out_path;
1488 *export_path = kstrndup(colon, len, GFP_KERNEL);
1489 if (!*export_path)
1490 goto out_nomem;
1491
1492 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1493 return 0;
1494
1495out_bad_devname:
1496 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1497 return -EINVAL;
1498
1499out_nomem:
1500 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1501 return -ENOMEM;
1502
1503out_hostname:
1504 dfprintk(MOUNT, "NFS: server hostname too long\n");
1505 return -ENAMETOOLONG;
1506
1507out_path:
1508 dfprintk(MOUNT, "NFS: export pathname too long\n");
1509 return -ENAMETOOLONG;
1510}
1511
d1aa0825
CL		 1512/*
1513 * Hostname has square brackets around it because it contains one or
1514 * more colons. We look for the first closing square bracket, and a
1515 * colon must follow it.
1516 */
1517static int nfs_parse_protected_hostname(const char *dev_name,
1518 char **hostname, size_t maxnamlen,
1519 char **export_path, size_t maxpathlen)
1520{
1521 size_t len;
1522 char *start, *end;
1523
1524 start = (char *)(dev_name + 1);
1525
1526 end = strchr(start, ']');
1527 if (end == NULL)
1528 goto out_bad_devname;
1529 if (*(end + 1) != ':')
1530 goto out_bad_devname;
1531
1532 len = end - start;
1533 if (len > maxnamlen)
1534 goto out_hostname;
1535
1536 /* N.B. caller will free nfs_server.hostname in all cases */
1537 *hostname = kstrndup(start, len, GFP_KERNEL);
1538 if (*hostname == NULL)
1539 goto out_nomem;
1540
1541 end += 2;
1542 len = strlen(end);
1543 if (len > maxpathlen)
1544 goto out_path;
1545 *export_path = kstrndup(end, len, GFP_KERNEL);
1546 if (!*export_path)
1547 goto out_nomem;
1548
1549 return 0;
1550
1551out_bad_devname:
1552 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1553 return -EINVAL;
1554
1555out_nomem:
1556 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1557 return -ENOMEM;
1558
1559out_hostname:
1560 dfprintk(MOUNT, "NFS: server hostname too long\n");
1561 return -ENAMETOOLONG;
1562
1563out_path:
1564 dfprintk(MOUNT, "NFS: export pathname too long\n");
1565 return -ENAMETOOLONG;
1566}
1567
1568/*
1569 * Split "dev_name" into "hostname:export_path".
1570 *
1571 * The leftmost colon demarks the split between the server's hostname
1572 * and the export path. If the hostname starts with a left square
1573 * bracket, then it may contain colons.
1574 *
1575 * Note: caller frees hostname and export path, even on error.
1576 */
1577static int nfs_parse_devname(const char *dev_name,
1578 char **hostname, size_t maxnamlen,
1579 char **export_path, size_t maxpathlen)
1580{
1581 if (*dev_name == '[')
1582 return nfs_parse_protected_hostname(dev_name,
1583 hostname, maxnamlen,
1584 export_path, maxpathlen);
1585
1586 return nfs_parse_simple_hostname(dev_name,
1587 hostname, maxnamlen,
1588 export_path, maxpathlen);
1589}
1590
f7b422b1 1591/*
54ceac45
DH		 1592 * Validate the NFS2/NFS3 mount data
1593 * - fills in the mount root filehandle
136d558c
CL		 1594 *
1595 * For option strings, user space handles the following behaviors:
1596 *
1597 * + DNS: mapping server host name to IP address ("addr=" option)
1598 *
1599 * + failure mode: how to behave if a mount request can't be handled
1600 * immediately ("fg/bg" option)
1601 *
1602 * + retry: how often to retry a mount request ("retry=" option)
1603 *
1604 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1605 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1606 */
2283f8d6
TT		 1607static int nfs_validate_mount_data(void *options,
1608 struct nfs_parsed_mount_data *args,
136d558c
CL		 1609 struct nfs_fh *mntfh,
1610 const char *dev_name)
f7b422b1 1611{
2283f8d6 1612 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1613 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1614
5df36e78
CL		 1615 if (data == NULL)
1616 goto out_no_data;
f7b422b1 1617
2283f8d6
TT		 1618 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1619 args->rsize = NFS_MAX_FILE_IO_SIZE;
1620 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1621 args->acregmin = NFS_DEF_ACREGMIN;
1622 args->acregmax = NFS_DEF_ACREGMAX;
1623 args->acdirmin = NFS_DEF_ACDIRMIN;
1624 args->acdirmax = NFS_DEF_ACDIRMAX;
4cfd74fc
CL		 1625 args->mount_server.port = NFS_UNSPEC_PORT;
1626 args->nfs_server.port = NFS_UNSPEC_PORT;
0896a725 1627 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1628 args->auth_flavors[0] = RPC_AUTH_UNIX;
059f90b3 1629 args->auth_flavor_len = 1;
2283f8d6 1630
54ceac45 1631 switch (data->version) {
5df36e78
CL		 1632 case 1:
1633 data->namlen = 0;
1634 case 2:
1635 data->bsize = 0;
1636 case 3:
1637 if (data->flags & NFS_MOUNT_VER3)
1638 goto out_no_v3;
1639 data->root.size = NFS2_FHSIZE;
1640 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1641 case 4:
1642 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1643 goto out_no_sec;
1644 case 5:
1645 memset(data->context, 0, sizeof(data->context));
1646 case 6:
b7e24457
TM		 1647 if (data->flags & NFS_MOUNT_VER3) {
1648 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1649 goto out_invalid_fh;
5df36e78 1650 mntfh->size = data->root.size;
b7e24457 1651 } else
5df36e78
CL		 1652 mntfh->size = NFS2_FHSIZE;
1653
5df36e78
CL		 1654
1655 memcpy(mntfh->data, data->root.data, mntfh->size);
1656 if (mntfh->size < sizeof(mntfh->data))
1657 memset(mntfh->data + mntfh->size, 0,
1658 sizeof(mntfh->data) - mntfh->size);
6e88e061 1659
2283f8d6
TT		 1660 /*
1661 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1662 * can deal with.
1663 */
ff3525a5 1664 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1665 args->rsize = data->rsize;
1666 args->wsize = data->wsize;
2283f8d6
TT		 1667 args->timeo = data->timeo;
1668 args->retrans = data->retrans;
1669 args->acregmin = data->acregmin;
1670 args->acregmax = data->acregmax;
1671 args->acdirmin = data->acdirmin;
1672 args->acdirmax = data->acdirmax;
4c568017 1673
4cfd74fc 1674 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1675 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1676 if (!nfs_verify_server_address(sap))
4c568017
CL		 1677 goto out_no_address;
1678
2283f8d6 1679 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1680 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1681 /* N.B. caller will free nfs_server.hostname in all cases */
1682 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1683 args->namlen = data->namlen;
1684 args->bsize = data->bsize;
dd07c947
CL		 1685
1686 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1687 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1688 if (!args->nfs_server.hostname)
1689 goto out_nomem;
f9c3a380
EP		 1690
1691 /*
1692 * The legacy version 6 binary mount data from userspace has a
1693 * field used only to transport selinux information into the
1694 * the kernel. To continue to support that functionality we
1695 * have a touch of selinux knowledge here in the NFS code. The
1696 * userspace code converted context=blah to just blah so we are
1697 * converting back to the full string selinux understands.
1698 */
1699 if (data->context[0]){
1700#ifdef CONFIG_SECURITY_SELINUX
1701 int rc;
1702 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1703 if (!opts_str)
1704 return -ENOMEM;
1705 strcpy(opts_str, "context=");
1706 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1707 strcat(opts_str, &data->context[0]);
1708 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1709 kfree(opts_str);
1710 if (rc)
1711 return rc;
1712#else
1713 return -EINVAL;
1714#endif
1715 }
1716
5df36e78 1717 break;
136d558c 1718 default: {
136d558c 1719 int status;
136d558c 1720
2283f8d6
TT		 1721 if (nfs_parse_mount_options((char *)options, args) == 0)
1722 return -EINVAL;
136d558c 1723
4cfd74fc 1724 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1725 goto out_no_address;
1726
4cfd74fc 1727 nfs_set_default_port(sap, args->nfs_server.port, 0);
ed596a8a 1728
259875ef
TM		 1729 nfs_set_mount_transport_protocol(args);
1730
dc045898
CL		 1731 status = nfs_parse_devname(dev_name,
1732 &args->nfs_server.hostname,
1733 PAGE_SIZE,
1734 &args->nfs_server.export_path,
1735 NFS_MAXPATHLEN);
1736 if (!status)
1737 status = nfs_try_mount(args, mntfh);
136d558c 1738
dc045898
CL		 1739 kfree(args->nfs_server.export_path);
1740 args->nfs_server.export_path = NULL;
136d558c 1741
136d558c 1742 if (status)
fdc6e2c8 1743 return status;
136d558c 1744
136d558c
CL		 1745 break;
1746 }
f7b422b1 1747 }
54ceac45
DH		 1748
1749#ifndef CONFIG_NFS_V3
2283f8d6 1750 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1751 goto out_v3_not_compiled;
1752#endif /* !CONFIG_NFS_V3 */
f7b422b1 1753
5df36e78 1754 return 0;
f7b422b1 1755
5df36e78
CL		 1756out_no_data:
1757 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1758 return -EINVAL;
54ceac45 1759
5df36e78
CL		 1760out_no_v3:
1761 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1762 data->version);
1763 return -EINVAL;
f7b422b1 1764
5df36e78
CL		 1765out_no_sec:
1766 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1767 return -EINVAL;
1768
5df36e78
CL		 1769#ifndef CONFIG_NFS_V3
1770out_v3_not_compiled:
1771 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1772 return -EPROTONOSUPPORT;
1773#endif /* !CONFIG_NFS_V3 */
1774
63649bd7
CG		 1775out_nomem:
1776 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1777 return -ENOMEM;
1778
5df36e78
CL		 1779out_no_address:
1780 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1781 return -EINVAL;
1782
1783out_invalid_fh:
1784 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1785 return -EINVAL;
f7b422b1
DH		 1786}
1787
48b605f8
JL		 1788static int
1789nfs_compare_remount_data(struct nfs_server *nfss,
1790 struct nfs_parsed_mount_data *data)
1791{
1792 if (data->flags != nfss->flags ||
1793 data->rsize != nfss->rsize ||
1794 data->wsize != nfss->wsize ||
1795 data->retrans != nfss->client->cl_timeout->to_retries ||
1796 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1797 data->acregmin != nfss->acregmin / HZ ||
1798 data->acregmax != nfss->acregmax / HZ ||
1799 data->acdirmin != nfss->acdirmin / HZ ||
1800 data->acdirmax != nfss->acdirmax / HZ ||
1801 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1802 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1803 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1804 data->nfs_server.addrlen) != 0)
1805 return -EINVAL;
1806
1807 return 0;
1808}
1809
1810static int
1811nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1812{
1813 int error;
1814 struct nfs_server *nfss = sb->s_fs_info;
1815 struct nfs_parsed_mount_data *data;
1816 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1817 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1818 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1819
1820 /*
1821 * Userspace mount programs that send binary options generally send
1822 * them populated with default values. We have no way to know which
1823 * ones were explicitly specified. Fall back to legacy behavior and
1824 * just return success.
1825 */
31c94469
MZ		 1826 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1827 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1828 options->version <= 6))))
48b605f8
JL		 1829 return 0;
1830
1831 data = kzalloc(sizeof(*data), GFP_KERNEL);
1832 if (data == NULL)
1833 return -ENOMEM;
1834
337eb00a 1835 lock_kernel();
48b605f8
JL		 1836 /* fill out struct with values from existing mount */
1837 data->flags = nfss->flags;
1838 data->rsize = nfss->rsize;
1839 data->wsize = nfss->wsize;
1840 data->retrans = nfss->client->cl_timeout->to_retries;
1841 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1842 data->acregmin = nfss->acregmin / HZ;
1843 data->acregmax = nfss->acregmax / HZ;
1844 data->acdirmin = nfss->acdirmin / HZ;
1845 data->acdirmax = nfss->acdirmax / HZ;
1846 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1847 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1848 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1849 data->nfs_server.addrlen);
1850
1851 /* overwrite those values with any that were specified */
1852 error = nfs_parse_mount_options((char *)options, data);
1853 if (error < 0)
1854 goto out;
1855
1856 /* compare new mount options with old ones */
1857 error = nfs_compare_remount_data(nfss, data);
1858out:
1859 kfree(data);
337eb00a 1860 unlock_kernel();
48b605f8
JL		 1861 return error;
1862}
1863
f7b422b1 1864/*
54ceac45 1865 * Initialise the common bits of the superblock
f7b422b1 1866 */
54ceac45 1867static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1868{
54ceac45 1869 struct nfs_server *server = NFS_SB(sb);
5006a76c 1870
54ceac45 1871 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1872
54ceac45
DH		 1873 /* We probably want something more informative here */
1874 snprintf(sb->s_id, sizeof(sb->s_id),
1875 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1876
54ceac45
DH		 1877 if (sb->s_blocksize == 0)
1878 sb->s_blocksize = nfs_block_bits(server->wsize,
1879 &sb->s_blocksize_bits);
f7b422b1 1880
54ceac45
DH		 1881 if (server->flags & NFS_MOUNT_NOAC)
1882 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1883
54ceac45 1884 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1885}
1886
1887/*
54ceac45 1888 * Finish setting up an NFS2/3 superblock
f7b422b1 1889 */
2283f8d6
TT		 1890static void nfs_fill_super(struct super_block *sb,
1891 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1892{
1893 struct nfs_server *server = NFS_SB(sb);
5006a76c 1894
54ceac45
DH		 1895 sb->s_blocksize_bits = 0;
1896 sb->s_blocksize = 0;
1897 if (data->bsize)
1898 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1899
54ceac45
DH		 1900 if (server->flags & NFS_MOUNT_VER3) {
1901 /* The VFS shouldn't apply the umask to mode bits. We will do
1902 * so ourselves when necessary.
1903 */
1904 sb->s_flags |= MS_POSIXACL;
1905 sb->s_time_gran = 1;
816724e6 1906 }
54ceac45
DH		 1907
1908 sb->s_op = &nfs_sops;
1909 nfs_initialise_sb(sb);
f7b422b1
DH		 1910}
1911
1912/*
54ceac45 1913 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1914 */
54ceac45
DH		 1915static void nfs_clone_super(struct super_block *sb,
1916 const struct super_block *old_sb)
f7b422b1 1917{
54ceac45
DH		 1918 struct nfs_server *server = NFS_SB(sb);
1919
1920 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1921 sb->s_blocksize = old_sb->s_blocksize;
1922 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1923
f7b422b1 1924 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1925 /* The VFS shouldn't apply the umask to mode bits. We will do
1926 * so ourselves when necessary.
f7b422b1
DH		 1927 */
1928 sb->s_flags |= MS_POSIXACL;
f7b422b1 1929 sb->s_time_gran = 1;
f7b422b1
DH		 1930 }
1931
54ceac45
DH		 1932 sb->s_op = old_sb->s_op;
1933 nfs_initialise_sb(sb);
f7b422b1
DH		 1934}
1935
275a5d24
TM		 1936static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1937{
1938 const struct nfs_server *a = s->s_fs_info;
1939 const struct rpc_clnt *clnt_a = a->client;
1940 const struct rpc_clnt *clnt_b = b->client;
1941
1942 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1943 goto Ebusy;
1944 if (a->nfs_client != b->nfs_client)
1945 goto Ebusy;
1946 if (a->flags != b->flags)
1947 goto Ebusy;
1948 if (a->wsize != b->wsize)
1949 goto Ebusy;
1950 if (a->rsize != b->rsize)
1951 goto Ebusy;
1952 if (a->acregmin != b->acregmin)
1953 goto Ebusy;
1954 if (a->acregmax != b->acregmax)
1955 goto Ebusy;
1956 if (a->acdirmin != b->acdirmin)
1957 goto Ebusy;
1958 if (a->acdirmax != b->acdirmax)
1959 goto Ebusy;
1960 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1961 goto Ebusy;
e89a5a43 1962 return 1;
275a5d24 1963Ebusy:
e89a5a43
TM		 1964 return 0;
1965}
1966
1967struct nfs_sb_mountdata {
1968 struct nfs_server *server;
1969 int mntflags;
1970};
1971
1972static int nfs_set_super(struct super_block *s, void *data)
1973{
1974 struct nfs_sb_mountdata *sb_mntdata = data;
1975 struct nfs_server *server = sb_mntdata->server;
1976 int ret;
1977
1978 s->s_flags = sb_mntdata->mntflags;
1979 s->s_fs_info = server;
1980 ret = set_anon_super(s, server);
1981 if (ret == 0)
1982 server->s_dev = s->s_dev;
1983 return ret;
1984}
1985
fd00a8ff
CL		 1986static int nfs_compare_super_address(struct nfs_server *server1,
1987 struct nfs_server *server2)
1988{
1989 struct sockaddr *sap1, *sap2;
1990
1991 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1992 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1993
1994 if (sap1->sa_family != sap2->sa_family)
1995 return 0;
1996
1997 switch (sap1->sa_family) {
1998 case AF_INET: {
1999 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2000 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2001 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2002 return 0;
2003 if (sin1->sin_port != sin2->sin_port)
2004 return 0;
2005 break;
2006 }
2007 case AF_INET6: {
2008 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2009 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2010 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2011 return 0;
2012 if (sin1->sin6_port != sin2->sin6_port)
2013 return 0;
2014 break;
2015 }
2016 default:
2017 return 0;
2018 }
2019
2020 return 1;
2021}
2022
e89a5a43
TM		 2023static int nfs_compare_super(struct super_block *sb, void *data)
2024{
2025 struct nfs_sb_mountdata *sb_mntdata = data;
2026 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2027 int mntflags = sb_mntdata->mntflags;
2028
fd00a8ff 2029 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2030 return 0;
2031 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2032 if (old->flags & NFS_MOUNT_UNSHARED)
2033 return 0;
2034 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2035 return 0;
2036 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2037}
2038
fa799759
MS		 2039static int nfs_bdi_register(struct nfs_server *server)
2040{
2041 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2042}
2043
816724e6
TM		 2044static int nfs_get_sb(struct file_system_type *fs_type,
2045 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2046{
f7b422b1
DH		 2047 struct nfs_server *server = NULL;
2048 struct super_block *s;
33852a1f
TM		 2049 struct nfs_parsed_mount_data *data;
2050 struct nfs_fh *mntfh;
54ceac45 2051 struct dentry *mntroot;
75180df2 2052 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2053 struct nfs_sb_mountdata sb_mntdata = {
2054 .mntflags = flags,
2055 };
33852a1f
TM		 2056 int error = -ENOMEM;
2057
2058 data = kzalloc(sizeof(*data), GFP_KERNEL);
2059 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2060 if (data == NULL || mntfh == NULL)
2061 goto out_free_fh;
f7b422b1 2062
33852a1f 2063 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2064
54ceac45 2065 /* Validate the mount data */
33852a1f 2066 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2067 if (error < 0)
0655960f 2068 goto out;
f7b422b1 2069
54ceac45 2070 /* Get a volume representation */
33852a1f 2071 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2072 if (IS_ERR(server)) {
2073 error = PTR_ERR(server);
0655960f 2074 goto out;
f7b422b1 2075 }
e89a5a43 2076 sb_mntdata.server = server;
f7b422b1 2077
75180df2
TM		 2078 if (server->flags & NFS_MOUNT_UNSHARED)
2079 compare_super = NULL;
2080
54ceac45 2081 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2082 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2083 if (IS_ERR(s)) {
2084 error = PTR_ERR(s);
54ceac45 2085 goto out_err_nosb;
816724e6
TM		 2086 }
2087
54ceac45
DH		 2088 if (s->s_fs_info != server) {
2089 nfs_free_server(server);
2090 server = NULL;
fa799759
MS		 2091 } else {
2092 error = nfs_bdi_register(server);
2093 if (error)
2094 goto error_splat_super;
54ceac45 2095 }
f7b422b1 2096
54ceac45
DH		 2097 if (!s->s_root) {
2098 /* initial superblock/root creation */
33852a1f 2099 nfs_fill_super(s, data);
08734048 2100 nfs_fscache_get_super_cookie(s, data);
54ceac45 2101 }
f7b422b1 2102
33852a1f 2103 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2104 if (IS_ERR(mntroot)) {
2105 error = PTR_ERR(mntroot);
2106 goto error_splat_super;
f7b422b1 2107 }
816724e6 2108
33852a1f 2109 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2110 if (error)
2111 goto error_splat_root;
2112
54ceac45
DH		 2113 s->s_flags |= MS_ACTIVE;
2114 mnt->mnt_sb = s;
2115 mnt->mnt_root = mntroot;
0655960f
CL		 2116 error = 0;
2117
2118out:
33852a1f
TM		 2119 kfree(data->nfs_server.hostname);
2120 kfree(data->mount_server.hostname);
08734048 2121 kfree(data->fscache_uniq);
33852a1f
TM		 2122 security_free_mnt_opts(&data->lsm_opts);
2123out_free_fh:
2124 kfree(mntfh);
2125 kfree(data);
0655960f 2126 return error;
816724e6 2127
54ceac45
DH		 2128out_err_nosb:
2129 nfs_free_server(server);
0655960f 2130 goto out;
54ceac45 2131
f9c3a380
EP		 2132error_splat_root:
2133 dput(mntroot);
54ceac45 2134error_splat_super:
6f5bbff9 2135 deactivate_locked_super(s);
0655960f 2136 goto out;
f7b422b1
DH		 2137}
2138
54ceac45
DH		 2139/*
2140 * Destroy an NFS2/3 superblock
2141 */
f7b422b1
DH		 2142static void nfs_kill_super(struct super_block *s)
2143{
2144 struct nfs_server *server = NFS_SB(s);
2145
fa799759 2146 bdi_unregister(&server->backing_dev_info);
f7b422b1 2147 kill_anon_super(s);
08734048 2148 nfs_fscache_release_super_cookie(s);
54ceac45 2149 nfs_free_server(server);
f7b422b1
DH		 2150}
2151
54ceac45
DH		 2152/*
2153 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2154 */
2155static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2156 const char *dev_name, void *raw_data,
2157 struct vfsmount *mnt)
f7b422b1
DH		 2158{
2159 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2160 struct super_block *s;
2161 struct nfs_server *server;
2162 struct dentry *mntroot;
75180df2 2163 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2164 struct nfs_sb_mountdata sb_mntdata = {
2165 .mntflags = flags,
2166 };
54ceac45 2167 int error;
f7b422b1 2168
54ceac45 2169 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2170
54ceac45
DH		 2171 /* create a new volume representation */
2172 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2173 if (IS_ERR(server)) {
2174 error = PTR_ERR(server);
2175 goto out_err_noserver;
2176 }
e89a5a43 2177 sb_mntdata.server = server;
8fa5c000 2178
75180df2
TM		 2179 if (server->flags & NFS_MOUNT_UNSHARED)
2180 compare_super = NULL;
2181
54ceac45 2182 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2183 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2184 if (IS_ERR(s)) {
2185 error = PTR_ERR(s);
2186 goto out_err_nosb;
2187 }
5006a76c 2188
54ceac45
DH		 2189 if (s->s_fs_info != server) {
2190 nfs_free_server(server);
2191 server = NULL;
fa799759
MS		 2192 } else {
2193 error = nfs_bdi_register(server);
2194 if (error)
2195 goto error_splat_super;
f7b422b1 2196 }
24c8dbbb 2197
54ceac45
DH		 2198 if (!s->s_root) {
2199 /* initial superblock/root creation */
54ceac45
DH		 2200 nfs_clone_super(s, data->sb);
2201 }
f7b422b1 2202
54ceac45
DH		 2203 mntroot = nfs_get_root(s, data->fh);
2204 if (IS_ERR(mntroot)) {
2205 error = PTR_ERR(mntroot);
2206 goto error_splat_super;
f7b422b1 2207 }
e9cc6c23 2208 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2209 dput(mntroot);
2210 error = -ESTALE;
2211 goto error_splat_super;
2212 }
f7b422b1 2213
54ceac45
DH		 2214 s->s_flags |= MS_ACTIVE;
2215 mnt->mnt_sb = s;
2216 mnt->mnt_root = mntroot;
f7b422b1 2217
f9c3a380
EP		 2218 /* clone any lsm security options from the parent to the new sb */
2219 security_sb_clone_mnt_opts(data->sb, s);
2220
54ceac45
DH		 2221 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2222 return 0;
24c8dbbb 2223
54ceac45
DH		 2224out_err_nosb:
2225 nfs_free_server(server);
2226out_err_noserver:
2227 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2228 return error;
f7b422b1 2229
54ceac45 2230error_splat_super:
6f5bbff9 2231 deactivate_locked_super(s);
54ceac45
DH		 2232 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2233 return error;
f7b422b1
DH		 2234}
2235
54ceac45
DH		 2236#ifdef CONFIG_NFS_V4
2237
f7b422b1 2238/*
54ceac45 2239 * Finish setting up a cloned NFS4 superblock
f7b422b1 2240 */
54ceac45
DH		 2241static void nfs4_clone_super(struct super_block *sb,
2242 const struct super_block *old_sb)
f7b422b1 2243{
54ceac45
DH		 2244 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2245 sb->s_blocksize = old_sb->s_blocksize;
2246 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2247 sb->s_time_gran = 1;
54ceac45
DH		 2248 sb->s_op = old_sb->s_op;
2249 nfs_initialise_sb(sb);
f7b422b1
DH		 2250}
2251
54ceac45
DH		 2252/*
2253 * Set up an NFS4 superblock
2254 */
2255static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2256{
54ceac45
DH		 2257 sb->s_time_gran = 1;
2258 sb->s_op = &nfs4_sops;
2259 nfs_initialise_sb(sb);
f7b422b1
DH		 2260}
2261
01c3f052
TM		 2262static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2263{
2264 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2265}
2266
7630c852
CL		 2267static int nfs4_validate_text_mount_data(void *options,
2268 struct nfs_parsed_mount_data *args,
2269 const char *dev_name)
2270{
2271 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2272
2273 nfs_set_default_port(sap, args->nfs_server.port, NFS_PORT);
2274
2275 nfs_validate_transport_protocol(args);
2276
2277 nfs4_validate_mount_flags(args);
2278
2279 if (args->auth_flavor_len > 1) {
2280 dfprintk(MOUNT,
2281 "NFS4: Too many RPC auth flavours specified\n");
2282 return -EINVAL;
2283 }
2284
2285 if (args->client_address == NULL) {
2286 dfprintk(MOUNT,
2287 "NFS4: mount program didn't pass callback address\n");
2288 return -EINVAL;
2289 }
2290
2291 return nfs_parse_devname(dev_name,
2292 &args->nfs_server.hostname,
2293 NFS4_MAXNAMLEN,
2294 &args->nfs_server.export_path,
2295 NFS4_MAXPATHLEN);
2296}
2297
f0768ebd
CL		 2298/*
2299 * Validate NFSv4 mount options
2300 */
91ea40b9
TT		 2301static int nfs4_validate_mount_data(void *options,
2302 struct nfs_parsed_mount_data *args,
2303 const char *dev_name)
f0768ebd 2304{
4cfd74fc 2305 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2306 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2307 char *c;
2308
2309 if (data == NULL)
2310 goto out_no_data;
2311
91ea40b9
TT		 2312 args->rsize = NFS_MAX_FILE_IO_SIZE;
2313 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2314 args->acregmin = NFS_DEF_ACREGMIN;
2315 args->acregmax = NFS_DEF_ACREGMAX;
2316 args->acdirmin = NFS_DEF_ACDIRMIN;
2317 args->acdirmax = NFS_DEF_ACDIRMAX;
4cfd74fc 2318 args->nfs_server.port = NFS_UNSPEC_PORT;
6738b251 2319 args->auth_flavors[0] = RPC_AUTH_UNIX;
059f90b3 2320 args->auth_flavor_len = 1;
3fd5be9e 2321 args->minorversion = 0;
91ea40b9 2322
f0768ebd
CL		 2323 switch (data->version) {
2324 case 1:
4c568017
CL		 2325 if (data->host_addrlen > sizeof(args->nfs_server.address))
2326 goto out_no_address;
2327 if (data->host_addrlen == 0)
f0768ebd 2328 goto out_no_address;
4c568017 2329 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2330 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2331 return -EFAULT;
4cfd74fc 2332 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2333 goto out_no_address;
2334
6738b251
CL		 2335 if (data->auth_flavourlen) {
2336 if (data->auth_flavourlen > 1)
2337 goto out_inval_auth;
20c71f5e 2338 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2339 data->auth_flavours,
20c71f5e 2340 sizeof(args->auth_flavors[0])))
f0768ebd 2341 return -EFAULT;
f0768ebd
CL		 2342 }
2343
2344 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2345 if (IS_ERR(c))
2346 return PTR_ERR(c);
91ea40b9 2347 args->nfs_server.hostname = c;
f0768ebd
CL		 2348
2349 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2350 if (IS_ERR(c))
2351 return PTR_ERR(c);
91ea40b9
TT		 2352 args->nfs_server.export_path = c;
2353 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2354
2355 c = strndup_user(data->client_addr.data, 16);
2356 if (IS_ERR(c))
2357 return PTR_ERR(c);
91ea40b9
TT		 2358 args->client_address = c;
2359
2360 /*
2361 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2362 * can deal with.
2363 */
2364
2365 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2366 args->rsize = data->rsize;
2367 args->wsize = data->wsize;
2368 args->timeo = data->timeo;
2369 args->retrans = data->retrans;
2370 args->acregmin = data->acregmin;
2371 args->acregmax = data->acregmax;
2372 args->acdirmin = data->acdirmin;
2373 args->acdirmax = data->acdirmax;
2374 args->nfs_server.protocol = data->proto;
259875ef 2375 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2376
2377 break;
7630c852 2378 default:
91ea40b9 2379 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2380 return -EINVAL;
2381
4cfd74fc 2382 if (!nfs_verify_server_address(sap))
80071225 2383 return -EINVAL;
dc045898 2384
7630c852 2385 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2386 }
2387
2388 return 0;
2389
2390out_no_data:
2391 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2392 return -EINVAL;
2393
2394out_inval_auth:
2395 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2396 data->auth_flavourlen);
2397 return -EINVAL;
2398
2399out_no_address:
2400 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2401 return -EINVAL;
f0768ebd
CL		 2402}
2403
54ceac45 2404/*
c02d7adf 2405 * Get the superblock for the NFS4 root partition
54ceac45 2406 */
c02d7adf 2407static int nfs4_remote_get_sb(struct file_system_type *fs_type,
816724e6 2408 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2409{
c02d7adf 2410 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2411 struct super_block *s;
2412 struct nfs_server *server;
33852a1f 2413 struct nfs_fh *mntfh;
54ceac45 2414 struct dentry *mntroot;
75180df2 2415 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2416 struct nfs_sb_mountdata sb_mntdata = {
2417 .mntflags = flags,
2418 };
33852a1f
TM		 2419 int error = -ENOMEM;
2420
33852a1f
TM		 2421 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2422 if (data == NULL || mntfh == NULL)
2423 goto out_free_fh;
f7b422b1 2424
33852a1f 2425 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2426
54ceac45 2427 /* Get a volume representation */
33852a1f 2428 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2429 if (IS_ERR(server)) {
2430 error = PTR_ERR(server);
29eb981a 2431 goto out;
f7b422b1 2432 }
e89a5a43 2433 sb_mntdata.server = server;
f7b422b1 2434
75180df2
TM		 2435 if (server->flags & NFS4_MOUNT_UNSHARED)
2436 compare_super = NULL;
2437
54ceac45 2438 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2439 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2440 if (IS_ERR(s)) {
2441 error = PTR_ERR(s);
f7b422b1 2442 goto out_free;
816724e6
TM		 2443 }
2444
5dd3177a
TM		 2445 if (s->s_fs_info != server) {
2446 nfs_free_server(server);
2447 server = NULL;
fa799759
MS		 2448 } else {
2449 error = nfs_bdi_register(server);
2450 if (error)
2451 goto error_splat_super;
5dd3177a
TM		 2452 }
2453
54ceac45
DH		 2454 if (!s->s_root) {
2455 /* initial superblock/root creation */
54ceac45 2456 nfs4_fill_super(s);
08734048 2457 nfs_fscache_get_super_cookie(s, data);
54ceac45 2458 }
f7b422b1 2459
33852a1f 2460 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2461 if (IS_ERR(mntroot)) {
2462 error = PTR_ERR(mntroot);
2463 goto error_splat_super;
f7b422b1 2464 }
54ceac45 2465
33852a1f 2466 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2467 if (error)
2468 goto error_splat_root;
2469
f7b422b1 2470 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2471 mnt->mnt_sb = s;
2472 mnt->mnt_root = mntroot;
29eb981a
CL		 2473 error = 0;
2474
2475out:
33852a1f
TM		 2476 security_free_mnt_opts(&data->lsm_opts);
2477out_free_fh:
2478 kfree(mntfh);
29eb981a 2479 return error;
54ceac45 2480
f7b422b1 2481out_free:
54ceac45 2482 nfs_free_server(server);
29eb981a 2483 goto out;
54ceac45 2484
46c8ac74
EP		 2485error_splat_root:
2486 dput(mntroot);
54ceac45 2487error_splat_super:
6f5bbff9 2488 deactivate_locked_super(s);
29eb981a 2489 goto out;
f7b422b1
DH		 2490}
2491
c02d7adf
TM		 2492static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2493 int flags, void *data, const char *hostname)
2494{
2495 struct vfsmount *root_mnt;
2496 char *root_devname;
2497 size_t len;
2498
2499 len = strlen(hostname) + 3;
2500 root_devname = kmalloc(len, GFP_KERNEL);
2501 if (root_devname == NULL)
2502 return ERR_PTR(-ENOMEM);
2503 snprintf(root_devname, len, "%s:/", hostname);
2504 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2505 kfree(root_devname);
2506 return root_mnt;
2507}
2508
b88f8a54
TM		 2509static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2510{
2511 char *page = (char *) __get_free_page(GFP_KERNEL);
2512 char *devname, *tmp;
2513
2514 if (page == NULL)
2515 return;
2516 devname = nfs_path(path->mnt->mnt_devname,
2517 path->mnt->mnt_root, path->dentry,
2518 page, PAGE_SIZE);
2519 if (devname == NULL)
2520 goto out_freepage;
2521 tmp = kstrdup(devname, GFP_KERNEL);
2522 if (tmp == NULL)
2523 goto out_freepage;
2524 kfree(mnt->mnt_devname);
2525 mnt->mnt_devname = tmp;
2526out_freepage:
2527 free_page((unsigned long)page);
2528}
2529
c02d7adf
TM		 2530static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2531 const char *export_path, struct vfsmount *mnt_target)
2532{
2533 struct mnt_namespace *ns_private;
2534 struct nameidata nd;
2535 struct super_block *s;
2536 int ret;
2537
2538 ns_private = create_mnt_ns(root_mnt);
2539 ret = PTR_ERR(ns_private);
2540 if (IS_ERR(ns_private))
2541 goto out_mntput;
2542
2543 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2544 export_path, LOOKUP_FOLLOW, &nd);
2545
2546 put_mnt_ns(ns_private);
2547
2548 if (ret != 0)
2549 goto out_err;
2550
2551 s = nd.path.mnt->mnt_sb;
2552 atomic_inc(&s->s_active);
2553 mnt_target->mnt_sb = s;
2554 mnt_target->mnt_root = dget(nd.path.dentry);
2555
b88f8a54
TM		 2556 /* Correct the device pathname */
2557 nfs_fix_devname(&nd.path, mnt_target);
2558
c02d7adf
TM		 2559 path_put(&nd.path);
2560 down_write(&s->s_umount);
2561 return 0;
2562out_mntput:
2563 mntput(root_mnt);
2564out_err:
2565 return ret;
2566}
2567
2568/*
2569 * Get the superblock for an NFS4 mountpoint
2570 */
2571static int nfs4_get_sb(struct file_system_type *fs_type,
2572 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2573{
2574 struct nfs_parsed_mount_data *data;
2575 char *export_path;
2576 struct vfsmount *root_mnt;
2577 int error = -ENOMEM;
2578
2579 data = kzalloc(sizeof(*data), GFP_KERNEL);
2580 if (data == NULL)
2581 goto out_free_data;
2582
2583 /* Validate the mount data */
2584 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2585 if (error < 0)
2586 goto out;
2587
2588 export_path = data->nfs_server.export_path;
2589 data->nfs_server.export_path = "/";
2590 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2591 data->nfs_server.hostname);
2592 data->nfs_server.export_path = export_path;
2593
2594 error = PTR_ERR(root_mnt);
2595 if (IS_ERR(root_mnt))
2596 goto out;
2597
2598 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2599
2600out:
2601 kfree(data->client_address);
2602 kfree(data->nfs_server.export_path);
2603 kfree(data->nfs_server.hostname);
2604 kfree(data->fscache_uniq);
2605out_free_data:
2606 kfree(data);
2607 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2608 error != 0 ? " [error]" : "");
2609 return error;
2610}
2611
f7b422b1
DH		 2612static void nfs4_kill_super(struct super_block *sb)
2613{
2614 struct nfs_server *server = NFS_SB(sb);
2615
0f3e66c6 2616 dprintk("--> %s\n", __func__);
515d8611 2617 nfs_super_return_all_delegations(sb);
f7b422b1 2618 kill_anon_super(sb);
f7b422b1 2619 nfs4_renewd_prepare_shutdown(server);
08734048 2620 nfs_fscache_release_super_cookie(sb);
54ceac45 2621 nfs_free_server(server);
0f3e66c6 2622 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2623}
2624
2625/*
54ceac45 2626 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2627 */
54ceac45
DH		 2628static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2629 const char *dev_name, void *raw_data,
2630 struct vfsmount *mnt)
f7b422b1 2631{
54ceac45
DH		 2632 struct nfs_clone_mount *data = raw_data;
2633 struct super_block *s;
2634 struct nfs_server *server;
2635 struct dentry *mntroot;
75180df2 2636 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2637 struct nfs_sb_mountdata sb_mntdata = {
2638 .mntflags = flags,
2639 };
54ceac45 2640 int error;
f7b422b1 2641
54ceac45 2642 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2643
54ceac45
DH		 2644 /* create a new volume representation */
2645 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2646 if (IS_ERR(server)) {
2647 error = PTR_ERR(server);
2648 goto out_err_noserver;
f7b422b1 2649 }
e89a5a43 2650 sb_mntdata.server = server;
f7b422b1 2651
75180df2
TM		 2652 if (server->flags & NFS4_MOUNT_UNSHARED)
2653 compare_super = NULL;
2654
54ceac45 2655 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2656 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2657 if (IS_ERR(s)) {
2658 error = PTR_ERR(s);
2659 goto out_err_nosb;
f7b422b1 2660 }
f7b422b1 2661
54ceac45
DH		 2662 if (s->s_fs_info != server) {
2663 nfs_free_server(server);
2664 server = NULL;
fa799759
MS		 2665 } else {
2666 error = nfs_bdi_register(server);
2667 if (error)
2668 goto error_splat_super;
54ceac45 2669 }
f7b422b1 2670
54ceac45
DH		 2671 if (!s->s_root) {
2672 /* initial superblock/root creation */
54ceac45
DH		 2673 nfs4_clone_super(s, data->sb);
2674 }
f7b422b1 2675
54ceac45
DH		 2676 mntroot = nfs4_get_root(s, data->fh);
2677 if (IS_ERR(mntroot)) {
2678 error = PTR_ERR(mntroot);
2679 goto error_splat_super;
2680 }
e9cc6c23
TM		 2681 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2682 dput(mntroot);
2683 error = -ESTALE;
2684 goto error_splat_super;
2685 }
f7b422b1 2686
54ceac45
DH		 2687 s->s_flags |= MS_ACTIVE;
2688 mnt->mnt_sb = s;
2689 mnt->mnt_root = mntroot;
2690
46c8ac74
EP		 2691 security_sb_clone_mnt_opts(data->sb, s);
2692
54ceac45
DH		 2693 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2694 return 0;
2695
2696out_err_nosb:
2697 nfs_free_server(server);
2698out_err_noserver:
2699 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2700 return error;
2701
2702error_splat_super:
6f5bbff9 2703 deactivate_locked_super(s);
54ceac45
DH		 2704 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2705 return error;
f7b422b1
DH		 2706}
2707
c02d7adf
TM		 2708static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2709 int flags, const char *dev_name, void *raw_data,
2710 struct vfsmount *mnt)
f7b422b1
DH		 2711{
2712 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2713 struct super_block *s;
2714 struct nfs_server *server;
2715 struct dentry *mntroot;
2716 struct nfs_fh mntfh;
75180df2 2717 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2718 struct nfs_sb_mountdata sb_mntdata = {
2719 .mntflags = flags,
2720 };
54ceac45
DH		 2721 int error;
2722
2723 dprintk("--> nfs4_referral_get_sb()\n");
2724
2725 /* create a new volume representation */
2726 server = nfs4_create_referral_server(data, &mntfh);
2727 if (IS_ERR(server)) {
2728 error = PTR_ERR(server);
2729 goto out_err_noserver;
2730 }
e89a5a43 2731 sb_mntdata.server = server;
54ceac45 2732
75180df2
TM		 2733 if (server->flags & NFS4_MOUNT_UNSHARED)
2734 compare_super = NULL;
2735
54ceac45 2736 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2737 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2738 if (IS_ERR(s)) {
2739 error = PTR_ERR(s);
2740 goto out_err_nosb;
2741 }
2742
2743 if (s->s_fs_info != server) {
2744 nfs_free_server(server);
2745 server = NULL;
fa799759
MS		 2746 } else {
2747 error = nfs_bdi_register(server);
2748 if (error)
2749 goto error_splat_super;
54ceac45
DH		 2750 }
2751
2752 if (!s->s_root) {
2753 /* initial superblock/root creation */
54ceac45
DH		 2754 nfs4_fill_super(s);
2755 }
2756
f2d0d85e 2757 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2758 if (IS_ERR(mntroot)) {
2759 error = PTR_ERR(mntroot);
2760 goto error_splat_super;
2761 }
e9cc6c23
TM		 2762 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2763 dput(mntroot);
2764 error = -ESTALE;
2765 goto error_splat_super;
2766 }
54ceac45
DH		 2767
2768 s->s_flags |= MS_ACTIVE;
2769 mnt->mnt_sb = s;
2770 mnt->mnt_root = mntroot;
2771
46c8ac74
EP		 2772 security_sb_clone_mnt_opts(data->sb, s);
2773
54ceac45
DH		 2774 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2775 return 0;
2776
2777out_err_nosb:
2778 nfs_free_server(server);
2779out_err_noserver:
2780 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2781 return error;
2782
2783error_splat_super:
6f5bbff9 2784 deactivate_locked_super(s);
54ceac45
DH		 2785 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2786 return error;
f7b422b1
DH		 2787}
2788
c02d7adf
TM		 2789/*
2790 * Create an NFS4 server record on referral traversal
2791 */
2792static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2793 int flags, const char *dev_name, void *raw_data,
2794 struct vfsmount *mnt)
2795{
2796 struct nfs_clone_mount *data = raw_data;
2797 char *export_path;
2798 struct vfsmount *root_mnt;
2799 int error;
2800
2801 dprintk("--> nfs4_referral_get_sb()\n");
2802
2803 export_path = data->mnt_path;
2804 data->mnt_path = "/";
2805
2806 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2807 flags, data, data->hostname);
2808 data->mnt_path = export_path;
2809
2810 error = PTR_ERR(root_mnt);
2811 if (IS_ERR(root_mnt))
2812 goto out;
2813
2814 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2815out:
2816 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2817 error != 0 ? " [error]" : "");
2818 return error;
2819}
2820
54ceac45 2821#endif /* CONFIG_NFS_V4 */
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