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nfs: Fix misparsing of nfsv4 fs_locations attribute
[deliverable/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 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
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>
45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff
CL		 48#include <linux/in6.h>
49#include <net/ipv6.h>
d8e7748a 50#include <linux/netdevice.h>
f7b422b1 51#include <linux/nfs_xdr.h>
b5d5dfbd 52#include <linux/magic.h>
bf0fd768 53#include <linux/parser.h>
f7b422b1
DH		 54
55#include <asm/system.h>
56#include <asm/uaccess.h>
57
58#include "nfs4_fs.h"
59#include "callback.h"
60#include "delegation.h"
61#include "iostat.h"
62#include "internal.h"
63
64#define NFSDBG_FACILITY NFSDBG_VFS
65
bf0fd768
CL		 66enum {
67 /* Mount options that take no arguments */
68 Opt_soft, Opt_hard,
bf0fd768
CL		 69 Opt_posix, Opt_noposix,
70 Opt_cto, Opt_nocto,
71 Opt_ac, Opt_noac,
72 Opt_lock, Opt_nolock,
73 Opt_v2, Opt_v3,
2cf7ff7a 74 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 75 Opt_acl, Opt_noacl,
76 Opt_rdirplus, Opt_nordirplus,
75180df2 77 Opt_sharecache, Opt_nosharecache,
bf0fd768
CL		 78
79 /* Mount options that take integer arguments */
80 Opt_port,
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
85 Opt_actimeo,
86 Opt_namelen,
87 Opt_mountport,
e887cbcf 88 Opt_mountvers,
ad879cef 89 Opt_nfsvers,
bf0fd768
CL		 90
91 /* Mount options that take string arguments */
33832034 92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 93 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 94 Opt_lookupcache,
bf0fd768 95
f45663ce
CL		 96 /* Special mount options */
97 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 98
99 Opt_err
100};
101
102static match_table_t nfs_mount_option_tokens = {
103 { Opt_userspace, "bg" },
104 { Opt_userspace, "fg" },
ecbb3845
CL		 105 { Opt_userspace, "retry=%s" },
106
f45663ce
CL		 107 { Opt_sloppy, "sloppy" },
108
bf0fd768
CL		 109 { Opt_soft, "soft" },
110 { Opt_hard, "hard" },
d33e4dfe
CL		 111 { Opt_deprecated, "intr" },
112 { Opt_deprecated, "nointr" },
bf0fd768
CL		 113 { Opt_posix, "posix" },
114 { Opt_noposix, "noposix" },
115 { Opt_cto, "cto" },
116 { Opt_nocto, "nocto" },
117 { Opt_ac, "ac" },
118 { Opt_noac, "noac" },
119 { Opt_lock, "lock" },
120 { Opt_nolock, "nolock" },
121 { Opt_v2, "v2" },
122 { Opt_v3, "v3" },
123 { Opt_udp, "udp" },
124 { Opt_tcp, "tcp" },
2cf7ff7a 125 { Opt_rdma, "rdma" },
bf0fd768
CL		 126 { Opt_acl, "acl" },
127 { Opt_noacl, "noacl" },
128 { Opt_rdirplus, "rdirplus" },
129 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 130 { Opt_sharecache, "sharecache" },
131 { Opt_nosharecache, "nosharecache" },
bf0fd768
CL		 132
133 { Opt_port, "port=%u" },
134 { Opt_rsize, "rsize=%u" },
135 { Opt_wsize, "wsize=%u" },
136 { Opt_bsize, "bsize=%u" },
137 { Opt_timeo, "timeo=%u" },
138 { Opt_retrans, "retrans=%u" },
139 { Opt_acregmin, "acregmin=%u" },
140 { Opt_acregmax, "acregmax=%u" },
141 { Opt_acdirmin, "acdirmin=%u" },
142 { Opt_acdirmax, "acdirmax=%u" },
143 { Opt_actimeo, "actimeo=%u" },
bf0fd768
CL		 144 { Opt_namelen, "namlen=%u" },
145 { Opt_mountport, "mountport=%u" },
bf0fd768 146 { Opt_mountvers, "mountvers=%u" },
bf0fd768
CL		 147 { Opt_nfsvers, "nfsvers=%u" },
148 { Opt_nfsvers, "vers=%u" },
149
150 { Opt_sec, "sec=%s" },
151 { Opt_proto, "proto=%s" },
152 { Opt_mountproto, "mountproto=%s" },
153 { Opt_addr, "addr=%s" },
154 { Opt_clientaddr, "clientaddr=%s" },
33832034 155 { Opt_mounthost, "mounthost=%s" },
0ac83779 156 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 157
7973c1f1
TM		 158 { Opt_lookupcache, "lookupcache=%s" },
159
bf0fd768
CL		 160 { Opt_err, NULL }
161};
162
163enum {
2cf7ff7a 164 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 165
166 Opt_xprt_err
167};
168
169static match_table_t nfs_xprt_protocol_tokens = {
170 { Opt_xprt_udp, "udp" },
171 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 172 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 173
174 { Opt_xprt_err, NULL }
175};
176
177enum {
178 Opt_sec_none, Opt_sec_sys,
179 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
180 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
181 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
182
183 Opt_sec_err
184};
185
186static match_table_t nfs_secflavor_tokens = {
187 { Opt_sec_none, "none" },
188 { Opt_sec_none, "null" },
189 { Opt_sec_sys, "sys" },
190
191 { Opt_sec_krb5, "krb5" },
192 { Opt_sec_krb5i, "krb5i" },
193 { Opt_sec_krb5p, "krb5p" },
194
195 { Opt_sec_lkey, "lkey" },
196 { Opt_sec_lkeyi, "lkeyi" },
197 { Opt_sec_lkeyp, "lkeyp" },
198
8d042218
OK		 199 { Opt_sec_spkm, "spkm3" },
200 { Opt_sec_spkmi, "spkm3i" },
201 { Opt_sec_spkmp, "spkm3p" },
202
bf0fd768
CL		 203 { Opt_sec_err, NULL }
204};
205
7973c1f1
TM		 206enum {
207 Opt_lookupcache_all, Opt_lookupcache_positive,
208 Opt_lookupcache_none,
209
210 Opt_lookupcache_err
211};
212
213static match_table_t nfs_lookupcache_tokens = {
214 { Opt_lookupcache_all, "all" },
215 { Opt_lookupcache_positive, "pos" },
216 { Opt_lookupcache_positive, "positive" },
217 { Opt_lookupcache_none, "none" },
218
219 { Opt_lookupcache_err, NULL }
220};
221
bf0fd768 222
42faad99 223static void nfs_umount_begin(struct super_block *);
816724e6 224static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 225static int nfs_show_options(struct seq_file *, struct vfsmount *);
226static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 227static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 228static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 229 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1 230static void nfs_kill_super(struct super_block *);
48b605f8 231static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 232
233static struct file_system_type nfs_fs_type = {
234 .owner = THIS_MODULE,
235 .name = "nfs",
236 .get_sb = nfs_get_sb,
237 .kill_sb = nfs_kill_super,
349457cc 238 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 239};
240
54ceac45 241struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 242 .owner = THIS_MODULE,
243 .name = "nfs",
54ceac45 244 .get_sb = nfs_xdev_get_sb,
f7b422b1 245 .kill_sb = nfs_kill_super,
349457cc 246 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 247};
248
ee9b6d61 249static const struct super_operations nfs_sops = {
f7b422b1
DH		 250 .alloc_inode = nfs_alloc_inode,
251 .destroy_inode = nfs_destroy_inode,
252 .write_inode = nfs_write_inode,
253 .statfs = nfs_statfs,
254 .clear_inode = nfs_clear_inode,
255 .umount_begin = nfs_umount_begin,
256 .show_options = nfs_show_options,
257 .show_stats = nfs_show_stats,
48b605f8 258 .remount_fs = nfs_remount,
f7b422b1
DH		 259};
260
261#ifdef CONFIG_NFS_V4
816724e6
TM		 262static int nfs4_get_sb(struct file_system_type *fs_type,
263 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 264static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
265 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
266static int nfs4_referral_get_sb(struct file_system_type *fs_type,
267 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 268static void nfs4_kill_super(struct super_block *sb);
269
270static struct file_system_type nfs4_fs_type = {
271 .owner = THIS_MODULE,
272 .name = "nfs4",
273 .get_sb = nfs4_get_sb,
274 .kill_sb = nfs4_kill_super,
349457cc 275 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 276};
277
54ceac45 278struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 279 .owner = THIS_MODULE,
280 .name = "nfs4",
54ceac45 281 .get_sb = nfs4_xdev_get_sb,
f7b422b1 282 .kill_sb = nfs4_kill_super,
349457cc 283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 284};
285
54ceac45 286struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 287 .owner = THIS_MODULE,
288 .name = "nfs4",
54ceac45 289 .get_sb = nfs4_referral_get_sb,
f7b422b1 290 .kill_sb = nfs4_kill_super,
349457cc 291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 292};
293
ee9b6d61 294static const struct super_operations nfs4_sops = {
f7b422b1
DH		 295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
298 .statfs = nfs_statfs,
299 .clear_inode = nfs4_clear_inode,
300 .umount_begin = nfs_umount_begin,
301 .show_options = nfs_show_options,
302 .show_stats = nfs_show_stats,
48b605f8 303 .remount_fs = nfs_remount,
f7b422b1
DH		 304};
305#endif
306
8e1f936b
RR		 307static struct shrinker acl_shrinker = {
308 .shrink = nfs_access_cache_shrinker,
309 .seeks = DEFAULT_SEEKS,
310};
979df72e 311
f7b422b1
DH		 312/*
313 * Register the NFS filesystems
314 */
315int __init register_nfs_fs(void)
316{
317 int ret;
318
319 ret = register_filesystem(&nfs_fs_type);
320 if (ret < 0)
321 goto error_0;
322
f7b422b1
DH		 323 ret = nfs_register_sysctl();
324 if (ret < 0)
325 goto error_1;
89a09141 326#ifdef CONFIG_NFS_V4
f7b422b1
DH		 327 ret = register_filesystem(&nfs4_fs_type);
328 if (ret < 0)
329 goto error_2;
330#endif
8e1f936b 331 register_shrinker(&acl_shrinker);
f7b422b1
DH		 332 return 0;
333
334#ifdef CONFIG_NFS_V4
335error_2:
336 nfs_unregister_sysctl();
89a09141 337#endif
f7b422b1
DH		 338error_1:
339 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 340error_0:
341 return ret;
342}
343
344/*
345 * Unregister the NFS filesystems
346 */
347void __exit unregister_nfs_fs(void)
348{
8e1f936b 349 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 350#ifdef CONFIG_NFS_V4
351 unregister_filesystem(&nfs4_fs_type);
f7b422b1 352#endif
49af7ee1 353 nfs_unregister_sysctl();
f7b422b1
DH		 354 unregister_filesystem(&nfs_fs_type);
355}
356
1daef0a8 357void nfs_sb_active(struct super_block *sb)
ef818a28 358{
1daef0a8 359 struct nfs_server *server = NFS_SB(sb);
ef818a28 360
1daef0a8
TM		 361 if (atomic_inc_return(&server->active) == 1)
362 atomic_inc(&sb->s_active);
ef818a28
SD		 363}
364
1daef0a8 365void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 366{
367 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 368
369 if (atomic_dec_and_test(&server->active))
370 deactivate_super(sb);
ef818a28
SD		 371}
372
f7b422b1
DH		 373/*
374 * Deliver file system statistics to userspace
375 */
816724e6 376static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 377{
0c7d90cf 378 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 379 unsigned char blockbits;
380 unsigned long blockres;
0c7d90cf 381 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 382 struct nfs_fattr fattr;
383 struct nfs_fsstat res = {
384 .fattr = &fattr,
385 };
386 int error;
387
8fa5c000 388 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 389 if (error < 0)
390 goto out_err;
1a0ba9ae 391 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 392
393 /*
394 * Current versions of glibc do not correctly handle the
395 * case where f_frsize != f_bsize. Eventually we want to
396 * report the value of wtmult in this field.
397 */
0c7d90cf 398 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 399
400 /*
401 * On most *nix systems, f_blocks, f_bfree, and f_bavail
402 * are reported in units of f_frsize. Linux hasn't had
403 * an f_frsize field in its statfs struct until recently,
404 * thus historically Linux's sys_statfs reports these
405 * fields in units of f_bsize.
406 */
0c7d90cf
DH		 407 buf->f_bsize = dentry->d_sb->s_blocksize;
408 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 409 blockres = (1 << blockbits) - 1;
410 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
411 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
412 buf->f_bavail = (res.abytes + blockres) >> blockbits;
413
414 buf->f_files = res.tfiles;
415 buf->f_ffree = res.afiles;
416
417 buf->f_namelen = server->namelen;
1a0ba9ae 418
f7b422b1
DH		 419 return 0;
420
421 out_err:
3110ff80 422 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 423 return error;
f7b422b1
DH		 424}
425
7d4e2747
DH		 426/*
427 * Map the security flavour number to a name
428 */
81039f1f
TM		 429static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
430{
7d4e2747 431 static const struct {
81039f1f
TM		 432 rpc_authflavor_t flavour;
433 const char *str;
434 } sec_flavours[] = {
435 { RPC_AUTH_NULL, "null" },
436 { RPC_AUTH_UNIX, "sys" },
437 { RPC_AUTH_GSS_KRB5, "krb5" },
438 { RPC_AUTH_GSS_KRB5I, "krb5i" },
439 { RPC_AUTH_GSS_KRB5P, "krb5p" },
440 { RPC_AUTH_GSS_LKEY, "lkey" },
441 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
442 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
443 { RPC_AUTH_GSS_SPKM, "spkm" },
444 { RPC_AUTH_GSS_SPKMI, "spkmi" },
445 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 446 { UINT_MAX, "unknown" }
81039f1f
TM		 447 };
448 int i;
449
4d81cd16 450 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 451 if (sec_flavours[i].flavour == flavour)
452 break;
453 }
454 return sec_flavours[i].str;
455}
456
82d101d5
CL		 457static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
458 int showdefaults)
459{
460 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
461
462 switch (sap->sa_family) {
463 case AF_INET: {
464 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
465 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
466 NIPQUAD(sin->sin_addr.s_addr));
467 break;
468 }
469 case AF_INET6: {
470 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
471 seq_printf(m, ",mountaddr=" NIP6_FMT,
472 NIP6(sin6->sin6_addr));
473 break;
474 }
475 default:
476 if (showdefaults)
477 seq_printf(m, ",mountaddr=unspecified");
478 }
479
480 if (nfss->mountd_version || showdefaults)
481 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
482 if (nfss->mountd_port || showdefaults)
483 seq_printf(m, ",mountport=%u", nfss->mountd_port);
484
485 switch (nfss->mountd_protocol) {
486 case IPPROTO_UDP:
487 seq_printf(m, ",mountproto=udp");
488 break;
489 case IPPROTO_TCP:
490 seq_printf(m, ",mountproto=tcp");
491 break;
492 default:
493 if (showdefaults)
494 seq_printf(m, ",mountproto=auto");
495 }
496}
497
f7b422b1
DH		 498/*
499 * Describe the mount options in force on this server representation
500 */
82d101d5
CL		 501static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
502 int showdefaults)
f7b422b1 503{
509de811 504 static const struct proc_nfs_info {
f7b422b1 505 int flag;
509de811
DH		 506 const char *str;
507 const char *nostr;
f7b422b1
DH		 508 } nfs_info[] = {
509 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5
CL		 510 { NFS_MOUNT_INTR, ",intr", ",nointr" },
511 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 512 { NFS_MOUNT_NOCTO, ",nocto", "" },
513 { NFS_MOUNT_NOAC, ",noac", "" },
514 { NFS_MOUNT_NONLM, ",nolock", "" },
515 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 516 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
75180df2 517 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
f7b422b1
DH		 518 { 0, NULL, NULL }
519 };
509de811 520 const struct proc_nfs_info *nfs_infop;
8fa5c000 521 struct nfs_client *clp = nfss->nfs_client;
82d101d5 522 u32 version = clp->rpc_ops->version;
f7b422b1 523
82d101d5 524 seq_printf(m, ",vers=%u", version);
2d767432
CL		 525 seq_printf(m, ",rsize=%u", nfss->rsize);
526 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 527 if (nfss->bsize != 0)
528 seq_printf(m, ",bsize=%u", nfss->bsize);
529 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 530 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 531 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 532 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 533 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 534 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 535 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 536 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 537 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 538 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
539 if (nfss->flags & nfs_infop->flag)
540 seq_puts(m, nfs_infop->str);
541 else
542 seq_puts(m, nfs_infop->nostr);
543 }
56928edd
TT		 544 seq_printf(m, ",proto=%s",
545 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 546 if (version == 4) {
547 if (nfss->port != NFS_PORT)
548 seq_printf(m, ",port=%u", nfss->port);
549 } else
550 if (nfss->port)
551 seq_printf(m, ",port=%u", nfss->port);
552
33170233
TM		 553 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
554 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 555 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 556
557 if (version != 4)
558 nfs_show_mountd_options(m, nfss, showdefaults);
559
560#ifdef CONFIG_NFS_V4
561 if (clp->rpc_ops->version == 4)
562 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
563#endif
f7b422b1
DH		 564}
565
566/*
567 * Describe the mount options on this VFS mountpoint
568 */
569static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
570{
571 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
572
573 nfs_show_mount_options(m, nfss, 0);
574
5d8515ca
CL		 575 seq_printf(m, ",addr=%s",
576 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
577 RPC_DISPLAY_ADDR));
f7b422b1
DH		 578
579 return 0;
580}
581
582/*
583 * Present statistical information for this VFS mountpoint
584 */
585static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
586{
587 int i, cpu;
588 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
589 struct rpc_auth *auth = nfss->client->cl_auth;
590 struct nfs_iostats totals = { };
591
592 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
593
594 /*
595 * Display all mount option settings
596 */
597 seq_printf(m, "\n\topts:\t");
598 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
599 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
600 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
601 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
602 nfs_show_mount_options(m, nfss, 1);
603
604 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
605
606 seq_printf(m, "\n\tcaps:\t");
607 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 608 seq_printf(m, ",wtmult=%u", nfss->wtmult);
609 seq_printf(m, ",dtsize=%u", nfss->dtsize);
610 seq_printf(m, ",bsize=%u", nfss->bsize);
611 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 612
613#ifdef CONFIG_NFS_V4
40c55319 614 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 615 seq_printf(m, "\n\tnfsv4:\t");
616 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
617 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
618 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
619 }
620#endif
621
622 /*
623 * Display security flavor in effect for this mount
624 */
2d767432 625 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 626 if (auth->au_flavor)
2d767432 627 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 628
629 /*
630 * Display superblock I/O counters
631 */
632 for_each_possible_cpu(cpu) {
633 struct nfs_iostats *stats;
634
635 preempt_disable();
636 stats = per_cpu_ptr(nfss->io_stats, cpu);
637
638 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
639 totals.events[i] += stats->events[i];
640 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
641 totals.bytes[i] += stats->bytes[i];
642
643 preempt_enable();
644 }
645
646 seq_printf(m, "\n\tevents:\t");
647 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
648 seq_printf(m, "%lu ", totals.events[i]);
649 seq_printf(m, "\n\tbytes:\t");
650 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
651 seq_printf(m, "%Lu ", totals.bytes[i]);
652 seq_printf(m, "\n");
653
654 rpc_print_iostats(m, nfss->client);
655
656 return 0;
657}
658
659/*
660 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 661 * in response to xdev traversals and referrals
f7b422b1 662 */
42faad99 663static void nfs_umount_begin(struct super_block *sb)
f7b422b1 664{
42faad99 665 struct nfs_server *server = NFS_SB(sb);
fc6ae3cf
TM		 666 struct rpc_clnt *rpc;
667
fc6ae3cf
TM		 668 /* -EIO all pending I/O */
669 rpc = server->client_acl;
670 if (!IS_ERR(rpc))
671 rpc_killall_tasks(rpc);
672 rpc = server->client;
673 if (!IS_ERR(rpc))
674 rpc_killall_tasks(rpc);
f7b422b1
DH		 675}
676
fc50d58f 677/*
cdcd7f9a
CL		 678 * Sanity-check a server address provided by the mount command.
679 *
680 * Address family must be initialized, and address must not be
681 * the ANY address for that family.
fc50d58f
CL		 682 */
683static int nfs_verify_server_address(struct sockaddr *addr)
684{
685 switch (addr->sa_family) {
686 case AF_INET: {
cdcd7f9a 687 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 688 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 689 }
690 case AF_INET6: {
691 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
692 return !ipv6_addr_any(sa);
fc50d58f
CL		 693 }
694 }
695
696 return 0;
697}
698
ce3b7e19
CL		 699static void nfs_parse_ipv4_address(char *string, size_t str_len,
700 struct sockaddr *sap, size_t *addr_len)
9412b927 701{
ce3b7e19
CL		 702 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
703 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
9412b927 704
ce3b7e19
CL		 705 if (str_len <= INET_ADDRSTRLEN) {
706 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
707 (int)str_len, string);
708
709 sin->sin_family = AF_INET;
710 *addr_len = sizeof(*sin);
711 if (in4_pton(string, str_len, addr, '\0', NULL))
3c7c7e48 712 return;
ce3b7e19
CL		 713 }
714
715 sap->sa_family = AF_UNSPEC;
716 *addr_len = 0;
717}
718
719#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
d8e7748a
CL		 720static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
721 const char *delim,
722 struct sockaddr_in6 *sin6)
723{
724 char *p;
725 size_t len;
726
727 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
728 return ;
729 if (*delim != IPV6_SCOPE_DELIMITER)
730 return;
731
732 len = (string + str_len) - delim - 1;
733 p = kstrndup(delim + 1, len, GFP_KERNEL);
734 if (p) {
735 unsigned long scope_id = 0;
736 struct net_device *dev;
737
738 dev = dev_get_by_name(&init_net, p);
739 if (dev != NULL) {
740 scope_id = dev->ifindex;
741 dev_put(dev);
742 } else {
743 /* scope_id is set to zero on error */
744 strict_strtoul(p, 10, &scope_id);
745 }
746
747 kfree(p);
748 sin6->sin6_scope_id = scope_id;
749 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
750 }
751}
752
ce3b7e19
CL		 753static void nfs_parse_ipv6_address(char *string, size_t str_len,
754 struct sockaddr *sap, size_t *addr_len)
755{
756 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
757 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
d8e7748a 758 const char *delim;
ce3b7e19
CL		 759
760 if (str_len <= INET6_ADDRSTRLEN) {
761 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
762 (int)str_len, string);
3c7c7e48 763
ce3b7e19
CL		 764 sin6->sin6_family = AF_INET6;
765 *addr_len = sizeof(*sin6);
d8e7748a
CL		 766 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
767 nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
3c7c7e48 768 return;
d8e7748a 769 }
3c7c7e48 770 }
9412b927
CL		 771
772 sap->sa_family = AF_UNSPEC;
ce3b7e19
CL		 773 *addr_len = 0;
774}
775#else
776static void nfs_parse_ipv6_address(char *string, size_t str_len,
777 struct sockaddr *sap, size_t *addr_len)
778{
779 sap->sa_family = AF_UNSPEC;
780 *addr_len = 0;
781}
782#endif
783
784/*
785 * Construct a sockaddr based on the contents of a string that contains
786 * an IP address in presentation format.
787 *
788 * If there is a problem constructing the new sockaddr, set the address
789 * family to AF_UNSPEC.
790 */
ea31a443 791void nfs_parse_ip_address(char *string, size_t str_len,
ce3b7e19
CL		 792 struct sockaddr *sap, size_t *addr_len)
793{
794 unsigned int i, colons;
795
796 colons = 0;
797 for (i = 0; i < str_len; i++)
798 if (string[i] == ':')
799 colons++;
800
801 if (colons >= 2)
802 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
803 else
804 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
9412b927
CL		 805}
806
259875ef
TM		 807/*
808 * Sanity check the NFS transport protocol.
809 *
810 */
811static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
812{
813 switch (mnt->nfs_server.protocol) {
814 case XPRT_TRANSPORT_UDP:
815 case XPRT_TRANSPORT_TCP:
816 case XPRT_TRANSPORT_RDMA:
817 break;
818 default:
819 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
820 }
821}
822
823/*
824 * For text based NFSv2/v3 mounts, the mount protocol transport default
825 * settings should depend upon the specified NFS transport.
826 */
827static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
828{
829 nfs_validate_transport_protocol(mnt);
830
831 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
832 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
833 return;
834 switch (mnt->nfs_server.protocol) {
835 case XPRT_TRANSPORT_UDP:
836 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
837 break;
838 case XPRT_TRANSPORT_TCP:
839 case XPRT_TRANSPORT_RDMA:
840 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
841 }
842}
843
01060c89
CL		 844/*
845 * Parse the value of the 'sec=' option.
846 *
dd07c947 847 * The flavor_len setting is for v4 mounts.
01060c89
CL		 848 */
849static int nfs_parse_security_flavors(char *value,
850 struct nfs_parsed_mount_data *mnt)
851{
852 substring_t args[MAX_OPT_ARGS];
853
854 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
855
856 switch (match_token(value, nfs_secflavor_tokens, args)) {
857 case Opt_sec_none:
01060c89
CL		 858 mnt->auth_flavor_len = 0;
859 mnt->auth_flavors[0] = RPC_AUTH_NULL;
860 break;
861 case Opt_sec_sys:
01060c89
CL		 862 mnt->auth_flavor_len = 0;
863 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
864 break;
865 case Opt_sec_krb5:
01060c89
CL		 866 mnt->auth_flavor_len = 1;
867 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
868 break;
869 case Opt_sec_krb5i:
01060c89
CL		 870 mnt->auth_flavor_len = 1;
871 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
872 break;
873 case Opt_sec_krb5p:
01060c89
CL		 874 mnt->auth_flavor_len = 1;
875 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
876 break;
877 case Opt_sec_lkey:
01060c89
CL		 878 mnt->auth_flavor_len = 1;
879 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
880 break;
881 case Opt_sec_lkeyi:
01060c89
CL		 882 mnt->auth_flavor_len = 1;
883 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
884 break;
885 case Opt_sec_lkeyp:
01060c89
CL		 886 mnt->auth_flavor_len = 1;
887 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
888 break;
889 case Opt_sec_spkm:
01060c89
CL		 890 mnt->auth_flavor_len = 1;
891 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
892 break;
893 case Opt_sec_spkmi:
01060c89
CL		 894 mnt->auth_flavor_len = 1;
895 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
896 break;
897 case Opt_sec_spkmp:
01060c89
CL		 898 mnt->auth_flavor_len = 1;
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
900 break;
901 default:
902 return 0;
903 }
904
905 return 1;
906}
907
f45663ce
CL		 908static void nfs_parse_invalid_value(const char *option)
909{
910 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
911}
912
bf0fd768
CL		 913/*
914 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 915 * a data structure. The whole mount string is processed; bad options are
916 * skipped as they are encountered. If there were no errors, return 1;
917 * otherwise return 0 (zero).
bf0fd768
CL		 918 */
919static int nfs_parse_mount_options(char *raw,
920 struct nfs_parsed_mount_data *mnt)
921{
f9c3a380 922 char *p, *string, *secdata;
f45663ce 923 int rc, sloppy = 0, errors = 0;
bf0fd768
CL		 924
925 if (!raw) {
926 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
927 return 1;
928 }
929 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
930
f9c3a380
EP		 931 secdata = alloc_secdata();
932 if (!secdata)
933 goto out_nomem;
934
935 rc = security_sb_copy_data(raw, secdata);
936 if (rc)
937 goto out_security_failure;
938
939 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
940 if (rc)
941 goto out_security_failure;
942
943 free_secdata(secdata);
944
bf0fd768
CL		 945 while ((p = strsep(&raw, ",")) != NULL) {
946 substring_t args[MAX_OPT_ARGS];
947 int option, token;
948
949 if (!*p)
950 continue;
951
952 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
953
954 token = match_token(p, nfs_mount_option_tokens, args);
955 switch (token) {
f45663ce
CL		 956
957 /*
958 * boolean options: foo/nofoo
959 */
bf0fd768
CL		 960 case Opt_soft:
961 mnt->flags |= NFS_MOUNT_SOFT;
962 break;
963 case Opt_hard:
964 mnt->flags &= ~NFS_MOUNT_SOFT;
965 break;
bf0fd768
CL		 966 case Opt_posix:
967 mnt->flags |= NFS_MOUNT_POSIX;
968 break;
969 case Opt_noposix:
970 mnt->flags &= ~NFS_MOUNT_POSIX;
971 break;
972 case Opt_cto:
973 mnt->flags &= ~NFS_MOUNT_NOCTO;
974 break;
975 case Opt_nocto:
976 mnt->flags |= NFS_MOUNT_NOCTO;
977 break;
978 case Opt_ac:
979 mnt->flags &= ~NFS_MOUNT_NOAC;
980 break;
981 case Opt_noac:
982 mnt->flags |= NFS_MOUNT_NOAC;
983 break;
984 case Opt_lock:
985 mnt->flags &= ~NFS_MOUNT_NONLM;
986 break;
987 case Opt_nolock:
988 mnt->flags |= NFS_MOUNT_NONLM;
989 break;
990 case Opt_v2:
991 mnt->flags &= ~NFS_MOUNT_VER3;
992 break;
993 case Opt_v3:
994 mnt->flags |= NFS_MOUNT_VER3;
995 break;
996 case Opt_udp:
997 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 998 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 999 break;
1000 case Opt_tcp:
1001 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1002 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1003 break;
2cf7ff7a
TT		 1004 case Opt_rdma:
1005 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1006 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
2cf7ff7a 1007 break;
bf0fd768
CL		 1008 case Opt_acl:
1009 mnt->flags &= ~NFS_MOUNT_NOACL;
1010 break;
1011 case Opt_noacl:
1012 mnt->flags |= NFS_MOUNT_NOACL;
1013 break;
1014 case Opt_rdirplus:
1015 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1016 break;
1017 case Opt_nordirplus:
1018 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1019 break;
75180df2
TM		 1020 case Opt_sharecache:
1021 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1022 break;
1023 case Opt_nosharecache:
1024 mnt->flags |= NFS_MOUNT_UNSHARED;
1025 break;
bf0fd768 1026
f45663ce
CL		 1027 /*
1028 * options that take numeric values
1029 */
bf0fd768 1030 case Opt_port:
f45663ce
CL		 1031 if (match_int(args, &option) ||
1032 option < 0 || option > USHORT_MAX) {
1033 errors++;
1034 nfs_parse_invalid_value("port");
1035 } else
1036 mnt->nfs_server.port = option;
bf0fd768
CL		 1037 break;
1038 case Opt_rsize:
f45663ce
CL		 1039 if (match_int(args, &option) || option < 0) {
1040 errors++;
1041 nfs_parse_invalid_value("rsize");
1042 } else
1043 mnt->rsize = option;
bf0fd768
CL		 1044 break;
1045 case Opt_wsize:
f45663ce
CL		 1046 if (match_int(args, &option) || option < 0) {
1047 errors++;
1048 nfs_parse_invalid_value("wsize");
1049 } else
1050 mnt->wsize = option;
bf0fd768
CL		 1051 break;
1052 case Opt_bsize:
f45663ce
CL		 1053 if (match_int(args, &option) || option < 0) {
1054 errors++;
1055 nfs_parse_invalid_value("bsize");
1056 } else
1057 mnt->bsize = option;
bf0fd768
CL		 1058 break;
1059 case Opt_timeo:
f45663ce
CL		 1060 if (match_int(args, &option) || option <= 0) {
1061 errors++;
1062 nfs_parse_invalid_value("timeo");
1063 } else
1064 mnt->timeo = option;
bf0fd768
CL		 1065 break;
1066 case Opt_retrans:
f45663ce
CL		 1067 if (match_int(args, &option) || option <= 0) {
1068 errors++;
1069 nfs_parse_invalid_value("retrans");
1070 } else
1071 mnt->retrans = option;
bf0fd768
CL		 1072 break;
1073 case Opt_acregmin:
f45663ce
CL		 1074 if (match_int(args, &option) || option < 0) {
1075 errors++;
1076 nfs_parse_invalid_value("acregmin");
1077 } else
1078 mnt->acregmin = option;
bf0fd768
CL		 1079 break;
1080 case Opt_acregmax:
f45663ce
CL		 1081 if (match_int(args, &option) || option < 0) {
1082 errors++;
1083 nfs_parse_invalid_value("acregmax");
1084 } else
1085 mnt->acregmax = option;
bf0fd768
CL		 1086 break;
1087 case Opt_acdirmin:
f45663ce
CL		 1088 if (match_int(args, &option) || option < 0) {
1089 errors++;
1090 nfs_parse_invalid_value("acdirmin");
1091 } else
1092 mnt->acdirmin = option;
bf0fd768
CL		 1093 break;
1094 case Opt_acdirmax:
f45663ce
CL		 1095 if (match_int(args, &option) || option < 0) {
1096 errors++;
1097 nfs_parse_invalid_value("acdirmax");
1098 } else
1099 mnt->acdirmax = option;
bf0fd768
CL		 1100 break;
1101 case Opt_actimeo:
f45663ce
CL		 1102 if (match_int(args, &option) || option < 0) {
1103 errors++;
1104 nfs_parse_invalid_value("actimeo");
1105 } else
1106 mnt->acregmin = mnt->acregmax =
1107 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1108 break;
1109 case Opt_namelen:
f45663ce
CL		 1110 if (match_int(args, &option) || option < 0) {
1111 errors++;
1112 nfs_parse_invalid_value("namlen");
1113 } else
1114 mnt->namlen = option;
bf0fd768
CL		 1115 break;
1116 case Opt_mountport:
f45663ce
CL		 1117 if (match_int(args, &option) ||
1118 option < 0 || option > USHORT_MAX) {
1119 errors++;
1120 nfs_parse_invalid_value("mountport");
1121 } else
1122 mnt->mount_server.port = option;
bf0fd768 1123 break;
bf0fd768 1124 case Opt_mountvers:
f45663ce
CL		 1125 if (match_int(args, &option) ||
1126 option < NFS_MNT_VERSION ||
1127 option > NFS_MNT3_VERSION) {
1128 errors++;
1129 nfs_parse_invalid_value("mountvers");
1130 } else
1131 mnt->mount_server.version = option;
bf0fd768 1132 break;
bf0fd768 1133 case Opt_nfsvers:
f45663ce
CL		 1134 if (match_int(args, &option)) {
1135 errors++;
1136 nfs_parse_invalid_value("nfsvers");
1137 break;
1138 }
bf0fd768 1139 switch (option) {
f45663ce 1140 case NFS2_VERSION:
bf0fd768
CL		 1141 mnt->flags &= ~NFS_MOUNT_VER3;
1142 break;
f45663ce 1143 case NFS3_VERSION:
bf0fd768
CL		 1144 mnt->flags |= NFS_MOUNT_VER3;
1145 break;
1146 default:
f45663ce
CL		 1147 errors++;
1148 nfs_parse_invalid_value("nfsvers");
bf0fd768
CL		 1149 }
1150 break;
1151
f45663ce
CL		 1152 /*
1153 * options that take text values
1154 */
bf0fd768
CL		 1155 case Opt_sec:
1156 string = match_strdup(args);
1157 if (string == NULL)
1158 goto out_nomem;
01060c89 1159 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1160 kfree(string);
f45663ce
CL		 1161 if (!rc) {
1162 errors++;
1163 dfprintk(MOUNT, "NFS: unrecognized "
1164 "security flavor\n");
1165 }
bf0fd768
CL		 1166 break;
1167 case Opt_proto:
1168 string = match_strdup(args);
1169 if (string == NULL)
1170 goto out_nomem;
1171 token = match_token(string,
1172 nfs_xprt_protocol_tokens, args);
1173 kfree(string);
1174
1175 switch (token) {
fdb66ff4 1176 case Opt_xprt_udp:
bf0fd768 1177 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1178 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1179 break;
fdb66ff4 1180 case Opt_xprt_tcp:
bf0fd768 1181 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1182 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1183 break;
2cf7ff7a
TT		 1184 case Opt_xprt_rdma:
1185 /* vector side protocols to TCP */
1186 mnt->flags |= NFS_MOUNT_TCP;
1187 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
2cf7ff7a 1188 break;
bf0fd768 1189 default:
f45663ce
CL		 1190 errors++;
1191 dfprintk(MOUNT, "NFS: unrecognized "
1192 "transport protocol\n");
bf0fd768
CL		 1193 }
1194 break;
1195 case Opt_mountproto:
1196 string = match_strdup(args);
1197 if (string == NULL)
1198 goto out_nomem;
1199 token = match_token(string,
1200 nfs_xprt_protocol_tokens, args);
1201 kfree(string);
1202
1203 switch (token) {
fdb66ff4 1204 case Opt_xprt_udp:
0896a725 1205 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1206 break;
fdb66ff4 1207 case Opt_xprt_tcp:
0896a725 1208 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1209 break;
2cf7ff7a 1210 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1211 default:
f45663ce
CL		 1212 errors++;
1213 dfprintk(MOUNT, "NFS: unrecognized "
1214 "transport protocol\n");
bf0fd768
CL		 1215 }
1216 break;
1217 case Opt_addr:
1218 string = match_strdup(args);
1219 if (string == NULL)
1220 goto out_nomem;
ce3b7e19
CL		 1221 nfs_parse_ip_address(string, strlen(string),
1222 (struct sockaddr *)
1223 &mnt->nfs_server.address,
1224 &mnt->nfs_server.addrlen);
bf0fd768
CL		 1225 kfree(string);
1226 break;
1227 case Opt_clientaddr:
1228 string = match_strdup(args);
1229 if (string == NULL)
1230 goto out_nomem;
fc601477 1231 kfree(mnt->client_address);
bf0fd768
CL		 1232 mnt->client_address = string;
1233 break;
33832034
CL		 1234 case Opt_mounthost:
1235 string = match_strdup(args);
1236 if (string == NULL)
1237 goto out_nomem;
fc601477 1238 kfree(mnt->mount_server.hostname);
33832034
CL		 1239 mnt->mount_server.hostname = string;
1240 break;
0ac83779 1241 case Opt_mountaddr:
bf0fd768
CL		 1242 string = match_strdup(args);
1243 if (string == NULL)
1244 goto out_nomem;
ce3b7e19
CL		 1245 nfs_parse_ip_address(string, strlen(string),
1246 (struct sockaddr *)
1247 &mnt->mount_server.address,
1248 &mnt->mount_server.addrlen);
bf0fd768
CL		 1249 kfree(string);
1250 break;
7973c1f1
TM		 1251 case Opt_lookupcache:
1252 string = match_strdup(args);
1253 if (string == NULL)
1254 goto out_nomem;
1255 token = match_token(string,
1256 nfs_lookupcache_tokens, args);
1257 kfree(string);
1258 switch (token) {
1259 case Opt_lookupcache_all:
1260 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1261 break;
1262 case Opt_lookupcache_positive:
1263 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1264 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1265 break;
1266 case Opt_lookupcache_none:
1267 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1268 break;
1269 default:
1270 errors++;
1271 dfprintk(MOUNT, "NFS: invalid "
1272 "lookupcache argument\n");
1273 };
1274 break;
bf0fd768 1275
f45663ce
CL		 1276 /*
1277 * Special options
1278 */
1279 case Opt_sloppy:
1280 sloppy = 1;
1281 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1282 break;
bf0fd768
CL		 1283 case Opt_userspace:
1284 case Opt_deprecated:
d33e4dfe
CL		 1285 dfprintk(MOUNT, "NFS: ignoring mount option "
1286 "'%s'\n", p);
bf0fd768
CL		 1287 break;
1288
1289 default:
f45663ce
CL		 1290 errors++;
1291 dfprintk(MOUNT, "NFS: unrecognized mount option "
1292 "'%s'\n", p);
bf0fd768
CL		 1293 }
1294 }
1295
af904dea
CL		 1296 if (errors > 0) {
1297 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1298 errors, (errors == 1 ? "" : "s"));
1299 if (!sloppy)
1300 return 0;
1301 }
bf0fd768
CL		 1302 return 1;
1303
1304out_nomem:
1305 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1306 return 0;
f9c3a380
EP		 1307out_security_failure:
1308 free_secdata(secdata);
1309 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1310 return 0;
bf0fd768
CL		 1311}
1312
0076d7b7
CL		 1313/*
1314 * Use the remote server's MOUNT service to request the NFS file handle
1315 * corresponding to the provided path.
1316 */
1317static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1318 struct nfs_fh *root_fh)
1319{
4c568017 1320 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
33832034 1321 char *hostname;
4c568017 1322 int status;
0076d7b7
CL		 1323
1324 if (args->mount_server.version == 0) {
1325 if (args->flags & NFS_MOUNT_VER3)
1326 args->mount_server.version = NFS_MNT3_VERSION;
1327 else
1328 args->mount_server.version = NFS_MNT_VERSION;
1329 }
1330
33832034
CL		 1331 if (args->mount_server.hostname)
1332 hostname = args->mount_server.hostname;
1333 else
1334 hostname = args->nfs_server.hostname;
1335
0076d7b7
CL		 1336 /*
1337 * Construct the mount server's address.
1338 */
4c568017
CL		 1339 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1340 memcpy(sap, &args->nfs_server.address,
1341 args->nfs_server.addrlen);
1342 args->mount_server.addrlen = args->nfs_server.addrlen;
1343 }
1344
aad70007
JL		 1345 /*
1346 * autobind will be used if mount_server.port == 0
1347 */
4c568017 1348 nfs_set_port(sap, args->mount_server.port);
0076d7b7
CL		 1349
1350 /*
1351 * Now ask the mount server to map our export path
1352 * to a file handle.
1353 */
4c568017
CL		 1354 status = nfs_mount(sap,
1355 args->mount_server.addrlen,
33832034 1356 hostname,
0076d7b7
CL		 1357 args->nfs_server.export_path,
1358 args->mount_server.version,
1359 args->mount_server.protocol,
1360 root_fh);
efd8340b
CL		 1361 if (status == 0)
1362 return 0;
0076d7b7 1363
396cee97 1364 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
33832034 1365 hostname, status);
0076d7b7
CL		 1366 return status;
1367}
1368
d1aa0825
CL		 1369static int nfs_parse_simple_hostname(const char *dev_name,
1370 char **hostname, size_t maxnamlen,
1371 char **export_path, size_t maxpathlen)
dc045898
CL		 1372{
1373 size_t len;
1374 char *colon, *comma;
1375
1376 colon = strchr(dev_name, ':');
1377 if (colon == NULL)
1378 goto out_bad_devname;
1379
1380 len = colon - dev_name;
1381 if (len > maxnamlen)
1382 goto out_hostname;
1383
1384 /* N.B. caller will free nfs_server.hostname in all cases */
1385 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1386 if (!*hostname)
1387 goto out_nomem;
1388
1389 /* kill possible hostname list: not supported */
1390 comma = strchr(*hostname, ',');
1391 if (comma != NULL) {
1392 if (comma == *hostname)
1393 goto out_bad_devname;
1394 *comma = '\0';
1395 }
1396
1397 colon++;
1398 len = strlen(colon);
1399 if (len > maxpathlen)
1400 goto out_path;
1401 *export_path = kstrndup(colon, len, GFP_KERNEL);
1402 if (!*export_path)
1403 goto out_nomem;
1404
1405 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1406 return 0;
1407
1408out_bad_devname:
1409 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1410 return -EINVAL;
1411
1412out_nomem:
1413 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1414 return -ENOMEM;
1415
1416out_hostname:
1417 dfprintk(MOUNT, "NFS: server hostname too long\n");
1418 return -ENAMETOOLONG;
1419
1420out_path:
1421 dfprintk(MOUNT, "NFS: export pathname too long\n");
1422 return -ENAMETOOLONG;
1423}
1424
d1aa0825
CL		 1425/*
1426 * Hostname has square brackets around it because it contains one or
1427 * more colons. We look for the first closing square bracket, and a
1428 * colon must follow it.
1429 */
1430static int nfs_parse_protected_hostname(const char *dev_name,
1431 char **hostname, size_t maxnamlen,
1432 char **export_path, size_t maxpathlen)
1433{
1434 size_t len;
1435 char *start, *end;
1436
1437 start = (char *)(dev_name + 1);
1438
1439 end = strchr(start, ']');
1440 if (end == NULL)
1441 goto out_bad_devname;
1442 if (*(end + 1) != ':')
1443 goto out_bad_devname;
1444
1445 len = end - start;
1446 if (len > maxnamlen)
1447 goto out_hostname;
1448
1449 /* N.B. caller will free nfs_server.hostname in all cases */
1450 *hostname = kstrndup(start, len, GFP_KERNEL);
1451 if (*hostname == NULL)
1452 goto out_nomem;
1453
1454 end += 2;
1455 len = strlen(end);
1456 if (len > maxpathlen)
1457 goto out_path;
1458 *export_path = kstrndup(end, len, GFP_KERNEL);
1459 if (!*export_path)
1460 goto out_nomem;
1461
1462 return 0;
1463
1464out_bad_devname:
1465 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1466 return -EINVAL;
1467
1468out_nomem:
1469 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1470 return -ENOMEM;
1471
1472out_hostname:
1473 dfprintk(MOUNT, "NFS: server hostname too long\n");
1474 return -ENAMETOOLONG;
1475
1476out_path:
1477 dfprintk(MOUNT, "NFS: export pathname too long\n");
1478 return -ENAMETOOLONG;
1479}
1480
1481/*
1482 * Split "dev_name" into "hostname:export_path".
1483 *
1484 * The leftmost colon demarks the split between the server's hostname
1485 * and the export path. If the hostname starts with a left square
1486 * bracket, then it may contain colons.
1487 *
1488 * Note: caller frees hostname and export path, even on error.
1489 */
1490static int nfs_parse_devname(const char *dev_name,
1491 char **hostname, size_t maxnamlen,
1492 char **export_path, size_t maxpathlen)
1493{
1494 if (*dev_name == '[')
1495 return nfs_parse_protected_hostname(dev_name,
1496 hostname, maxnamlen,
1497 export_path, maxpathlen);
1498
1499 return nfs_parse_simple_hostname(dev_name,
1500 hostname, maxnamlen,
1501 export_path, maxpathlen);
1502}
1503
f7b422b1 1504/*
54ceac45
DH		 1505 * Validate the NFS2/NFS3 mount data
1506 * - fills in the mount root filehandle
136d558c
CL		 1507 *
1508 * For option strings, user space handles the following behaviors:
1509 *
1510 * + DNS: mapping server host name to IP address ("addr=" option)
1511 *
1512 * + failure mode: how to behave if a mount request can't be handled
1513 * immediately ("fg/bg" option)
1514 *
1515 * + retry: how often to retry a mount request ("retry=" option)
1516 *
1517 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1518 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1519 */
2283f8d6
TT		 1520static int nfs_validate_mount_data(void *options,
1521 struct nfs_parsed_mount_data *args,
136d558c
CL		 1522 struct nfs_fh *mntfh,
1523 const char *dev_name)
f7b422b1 1524{
2283f8d6 1525 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
136d558c 1526
5df36e78
CL		 1527 if (data == NULL)
1528 goto out_no_data;
f7b422b1 1529
2283f8d6
TT		 1530 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1531 args->rsize = NFS_MAX_FILE_IO_SIZE;
1532 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1533 args->acregmin = NFS_DEF_ACREGMIN;
1534 args->acregmax = NFS_DEF_ACREGMAX;
1535 args->acdirmin = NFS_DEF_ACDIRMIN;
1536 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 1537 args->mount_server.port = 0; /* autobind unless user sets port */
f22d6d79 1538 args->nfs_server.port = 0; /* autobind unless user sets port */
0896a725 1539 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1540 args->auth_flavors[0] = RPC_AUTH_UNIX;
2283f8d6 1541
54ceac45 1542 switch (data->version) {
5df36e78
CL		 1543 case 1:
1544 data->namlen = 0;
1545 case 2:
1546 data->bsize = 0;
1547 case 3:
1548 if (data->flags & NFS_MOUNT_VER3)
1549 goto out_no_v3;
1550 data->root.size = NFS2_FHSIZE;
1551 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1552 case 4:
1553 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1554 goto out_no_sec;
1555 case 5:
1556 memset(data->context, 0, sizeof(data->context));
1557 case 6:
b7e24457
TM		 1558 if (data->flags & NFS_MOUNT_VER3) {
1559 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1560 goto out_invalid_fh;
5df36e78 1561 mntfh->size = data->root.size;
b7e24457 1562 } else
5df36e78
CL		 1563 mntfh->size = NFS2_FHSIZE;
1564
5df36e78
CL		 1565
1566 memcpy(mntfh->data, data->root.data, mntfh->size);
1567 if (mntfh->size < sizeof(mntfh->data))
1568 memset(mntfh->data + mntfh->size, 0,
1569 sizeof(mntfh->data) - mntfh->size);
6e88e061 1570
2283f8d6
TT		 1571 /*
1572 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1573 * can deal with.
1574 */
ff3525a5 1575 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1576 args->rsize = data->rsize;
1577 args->wsize = data->wsize;
2283f8d6
TT		 1578 args->timeo = data->timeo;
1579 args->retrans = data->retrans;
1580 args->acregmin = data->acregmin;
1581 args->acregmax = data->acregmax;
1582 args->acdirmin = data->acdirmin;
1583 args->acdirmax = data->acdirmax;
4c568017
CL		 1584
1585 memcpy(&args->nfs_server.address, &data->addr,
1586 sizeof(data->addr));
1587 args->nfs_server.addrlen = sizeof(data->addr);
1588 if (!nfs_verify_server_address((struct sockaddr *)
1589 &args->nfs_server.address))
1590 goto out_no_address;
1591
2283f8d6 1592 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1593 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1594 /* N.B. caller will free nfs_server.hostname in all cases */
1595 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1596 args->namlen = data->namlen;
1597 args->bsize = data->bsize;
dd07c947
CL		 1598
1599 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1600 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1601 if (!args->nfs_server.hostname)
1602 goto out_nomem;
f9c3a380
EP		 1603
1604 /*
1605 * The legacy version 6 binary mount data from userspace has a
1606 * field used only to transport selinux information into the
1607 * the kernel. To continue to support that functionality we
1608 * have a touch of selinux knowledge here in the NFS code. The
1609 * userspace code converted context=blah to just blah so we are
1610 * converting back to the full string selinux understands.
1611 */
1612 if (data->context[0]){
1613#ifdef CONFIG_SECURITY_SELINUX
1614 int rc;
1615 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1616 if (!opts_str)
1617 return -ENOMEM;
1618 strcpy(opts_str, "context=");
1619 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1620 strcat(opts_str, &data->context[0]);
1621 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1622 kfree(opts_str);
1623 if (rc)
1624 return rc;
1625#else
1626 return -EINVAL;
1627#endif
1628 }
1629
5df36e78 1630 break;
136d558c 1631 default: {
136d558c 1632 int status;
136d558c 1633
2283f8d6
TT		 1634 if (nfs_parse_mount_options((char *)options, args) == 0)
1635 return -EINVAL;
136d558c 1636
6e88e061
CL		 1637 if (!nfs_verify_server_address((struct sockaddr *)
1638 &args->nfs_server.address))
1639 goto out_no_address;
1640
ed596a8a
CL		 1641 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1642 args->nfs_server.port);
1643
259875ef
TM		 1644 nfs_set_mount_transport_protocol(args);
1645
dc045898
CL		 1646 status = nfs_parse_devname(dev_name,
1647 &args->nfs_server.hostname,
1648 PAGE_SIZE,
1649 &args->nfs_server.export_path,
1650 NFS_MAXPATHLEN);
1651 if (!status)
1652 status = nfs_try_mount(args, mntfh);
136d558c 1653
dc045898
CL		 1654 kfree(args->nfs_server.export_path);
1655 args->nfs_server.export_path = NULL;
136d558c 1656
136d558c 1657 if (status)
fdc6e2c8 1658 return status;
136d558c 1659
136d558c
CL		 1660 break;
1661 }
f7b422b1 1662 }
54ceac45
DH		 1663
1664#ifndef CONFIG_NFS_V3
2283f8d6 1665 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1666 goto out_v3_not_compiled;
1667#endif /* !CONFIG_NFS_V3 */
f7b422b1 1668
5df36e78 1669 return 0;
f7b422b1 1670
5df36e78
CL		 1671out_no_data:
1672 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1673 return -EINVAL;
54ceac45 1674
5df36e78
CL		 1675out_no_v3:
1676 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1677 data->version);
1678 return -EINVAL;
f7b422b1 1679
5df36e78
CL		 1680out_no_sec:
1681 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1682 return -EINVAL;
1683
5df36e78
CL		 1684#ifndef CONFIG_NFS_V3
1685out_v3_not_compiled:
1686 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1687 return -EPROTONOSUPPORT;
1688#endif /* !CONFIG_NFS_V3 */
1689
63649bd7
CG		 1690out_nomem:
1691 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1692 return -ENOMEM;
1693
5df36e78
CL		 1694out_no_address:
1695 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1696 return -EINVAL;
1697
1698out_invalid_fh:
1699 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1700 return -EINVAL;
f7b422b1
DH		 1701}
1702
48b605f8
JL		 1703static int
1704nfs_compare_remount_data(struct nfs_server *nfss,
1705 struct nfs_parsed_mount_data *data)
1706{
1707 if (data->flags != nfss->flags ||
1708 data->rsize != nfss->rsize ||
1709 data->wsize != nfss->wsize ||
1710 data->retrans != nfss->client->cl_timeout->to_retries ||
1711 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1712 data->acregmin != nfss->acregmin / HZ ||
1713 data->acregmax != nfss->acregmax / HZ ||
1714 data->acdirmin != nfss->acdirmin / HZ ||
1715 data->acdirmax != nfss->acdirmax / HZ ||
1716 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1717 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1718 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1719 data->nfs_server.addrlen) != 0)
1720 return -EINVAL;
1721
1722 return 0;
1723}
1724
1725static int
1726nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1727{
1728 int error;
1729 struct nfs_server *nfss = sb->s_fs_info;
1730 struct nfs_parsed_mount_data *data;
1731 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1732 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1733 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1734
1735 /*
1736 * Userspace mount programs that send binary options generally send
1737 * them populated with default values. We have no way to know which
1738 * ones were explicitly specified. Fall back to legacy behavior and
1739 * just return success.
1740 */
31c94469
MZ		 1741 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1742 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1743 options->version <= 6))))
48b605f8
JL		 1744 return 0;
1745
1746 data = kzalloc(sizeof(*data), GFP_KERNEL);
1747 if (data == NULL)
1748 return -ENOMEM;
1749
1750 /* fill out struct with values from existing mount */
1751 data->flags = nfss->flags;
1752 data->rsize = nfss->rsize;
1753 data->wsize = nfss->wsize;
1754 data->retrans = nfss->client->cl_timeout->to_retries;
1755 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1756 data->acregmin = nfss->acregmin / HZ;
1757 data->acregmax = nfss->acregmax / HZ;
1758 data->acdirmin = nfss->acdirmin / HZ;
1759 data->acdirmax = nfss->acdirmax / HZ;
1760 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1761 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1762 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1763 data->nfs_server.addrlen);
1764
1765 /* overwrite those values with any that were specified */
1766 error = nfs_parse_mount_options((char *)options, data);
1767 if (error < 0)
1768 goto out;
1769
1770 /* compare new mount options with old ones */
1771 error = nfs_compare_remount_data(nfss, data);
1772out:
1773 kfree(data);
1774 return error;
1775}
1776
f7b422b1 1777/*
54ceac45 1778 * Initialise the common bits of the superblock
f7b422b1 1779 */
54ceac45 1780static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1781{
54ceac45 1782 struct nfs_server *server = NFS_SB(sb);
5006a76c 1783
54ceac45 1784 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1785
54ceac45
DH		 1786 /* We probably want something more informative here */
1787 snprintf(sb->s_id, sizeof(sb->s_id),
1788 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1789
54ceac45
DH		 1790 if (sb->s_blocksize == 0)
1791 sb->s_blocksize = nfs_block_bits(server->wsize,
1792 &sb->s_blocksize_bits);
f7b422b1 1793
54ceac45
DH		 1794 if (server->flags & NFS_MOUNT_NOAC)
1795 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1796
54ceac45 1797 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1798}
1799
1800/*
54ceac45 1801 * Finish setting up an NFS2/3 superblock
f7b422b1 1802 */
2283f8d6
TT		 1803static void nfs_fill_super(struct super_block *sb,
1804 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1805{
1806 struct nfs_server *server = NFS_SB(sb);
5006a76c 1807
54ceac45
DH		 1808 sb->s_blocksize_bits = 0;
1809 sb->s_blocksize = 0;
1810 if (data->bsize)
1811 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1812
54ceac45
DH		 1813 if (server->flags & NFS_MOUNT_VER3) {
1814 /* The VFS shouldn't apply the umask to mode bits. We will do
1815 * so ourselves when necessary.
1816 */
1817 sb->s_flags |= MS_POSIXACL;
1818 sb->s_time_gran = 1;
816724e6 1819 }
54ceac45
DH		 1820
1821 sb->s_op = &nfs_sops;
1822 nfs_initialise_sb(sb);
f7b422b1
DH		 1823}
1824
1825/*
54ceac45 1826 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1827 */
54ceac45
DH		 1828static void nfs_clone_super(struct super_block *sb,
1829 const struct super_block *old_sb)
f7b422b1 1830{
54ceac45
DH		 1831 struct nfs_server *server = NFS_SB(sb);
1832
1833 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1834 sb->s_blocksize = old_sb->s_blocksize;
1835 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1836
f7b422b1 1837 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1838 /* The VFS shouldn't apply the umask to mode bits. We will do
1839 * so ourselves when necessary.
f7b422b1
DH		 1840 */
1841 sb->s_flags |= MS_POSIXACL;
f7b422b1 1842 sb->s_time_gran = 1;
f7b422b1
DH		 1843 }
1844
54ceac45
DH		 1845 sb->s_op = old_sb->s_op;
1846 nfs_initialise_sb(sb);
f7b422b1
DH		 1847}
1848
275a5d24
TM		 1849#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1850
1851static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1852{
1853 const struct nfs_server *a = s->s_fs_info;
1854 const struct rpc_clnt *clnt_a = a->client;
1855 const struct rpc_clnt *clnt_b = b->client;
1856
1857 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1858 goto Ebusy;
1859 if (a->nfs_client != b->nfs_client)
1860 goto Ebusy;
1861 if (a->flags != b->flags)
1862 goto Ebusy;
1863 if (a->wsize != b->wsize)
1864 goto Ebusy;
1865 if (a->rsize != b->rsize)
1866 goto Ebusy;
1867 if (a->acregmin != b->acregmin)
1868 goto Ebusy;
1869 if (a->acregmax != b->acregmax)
1870 goto Ebusy;
1871 if (a->acdirmin != b->acdirmin)
1872 goto Ebusy;
1873 if (a->acdirmax != b->acdirmax)
1874 goto Ebusy;
1875 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1876 goto Ebusy;
e89a5a43 1877 return 1;
275a5d24 1878Ebusy:
e89a5a43
TM		 1879 return 0;
1880}
1881
1882struct nfs_sb_mountdata {
1883 struct nfs_server *server;
1884 int mntflags;
1885};
1886
1887static int nfs_set_super(struct super_block *s, void *data)
1888{
1889 struct nfs_sb_mountdata *sb_mntdata = data;
1890 struct nfs_server *server = sb_mntdata->server;
1891 int ret;
1892
1893 s->s_flags = sb_mntdata->mntflags;
1894 s->s_fs_info = server;
1895 ret = set_anon_super(s, server);
1896 if (ret == 0)
1897 server->s_dev = s->s_dev;
1898 return ret;
1899}
1900
fd00a8ff
CL		 1901static int nfs_compare_super_address(struct nfs_server *server1,
1902 struct nfs_server *server2)
1903{
1904 struct sockaddr *sap1, *sap2;
1905
1906 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1907 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1908
1909 if (sap1->sa_family != sap2->sa_family)
1910 return 0;
1911
1912 switch (sap1->sa_family) {
1913 case AF_INET: {
1914 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1915 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1916 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1917 return 0;
1918 if (sin1->sin_port != sin2->sin_port)
1919 return 0;
1920 break;
1921 }
1922 case AF_INET6: {
1923 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1924 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1925 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1926 return 0;
1927 if (sin1->sin6_port != sin2->sin6_port)
1928 return 0;
1929 break;
1930 }
1931 default:
1932 return 0;
1933 }
1934
1935 return 1;
1936}
1937
e89a5a43
TM		 1938static int nfs_compare_super(struct super_block *sb, void *data)
1939{
1940 struct nfs_sb_mountdata *sb_mntdata = data;
1941 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1942 int mntflags = sb_mntdata->mntflags;
1943
fd00a8ff 1944 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 1945 return 0;
1946 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1947 if (old->flags & NFS_MOUNT_UNSHARED)
1948 return 0;
1949 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1950 return 0;
1951 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 1952}
1953
fa799759
MS		 1954static int nfs_bdi_register(struct nfs_server *server)
1955{
1956 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1957}
1958
816724e6
TM		 1959static int nfs_get_sb(struct file_system_type *fs_type,
1960 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 1961{
f7b422b1
DH		 1962 struct nfs_server *server = NULL;
1963 struct super_block *s;
33852a1f
TM		 1964 struct nfs_parsed_mount_data *data;
1965 struct nfs_fh *mntfh;
54ceac45 1966 struct dentry *mntroot;
75180df2 1967 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1968 struct nfs_sb_mountdata sb_mntdata = {
1969 .mntflags = flags,
1970 };
33852a1f
TM		 1971 int error = -ENOMEM;
1972
1973 data = kzalloc(sizeof(*data), GFP_KERNEL);
1974 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1975 if (data == NULL || mntfh == NULL)
1976 goto out_free_fh;
f7b422b1 1977
33852a1f 1978 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 1979
54ceac45 1980 /* Validate the mount data */
33852a1f 1981 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 1982 if (error < 0)
0655960f 1983 goto out;
f7b422b1 1984
54ceac45 1985 /* Get a volume representation */
33852a1f 1986 server = nfs_create_server(data, mntfh);
54ceac45
DH		 1987 if (IS_ERR(server)) {
1988 error = PTR_ERR(server);
0655960f 1989 goto out;
f7b422b1 1990 }
e89a5a43 1991 sb_mntdata.server = server;
f7b422b1 1992
75180df2
TM		 1993 if (server->flags & NFS_MOUNT_UNSHARED)
1994 compare_super = NULL;
1995
54ceac45 1996 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 1997 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 1998 if (IS_ERR(s)) {
1999 error = PTR_ERR(s);
54ceac45 2000 goto out_err_nosb;
816724e6
TM		 2001 }
2002
54ceac45
DH		 2003 if (s->s_fs_info != server) {
2004 nfs_free_server(server);
2005 server = NULL;
fa799759
MS		 2006 } else {
2007 error = nfs_bdi_register(server);
2008 if (error)
2009 goto error_splat_super;
54ceac45 2010 }
f7b422b1 2011
54ceac45
DH		 2012 if (!s->s_root) {
2013 /* initial superblock/root creation */
33852a1f 2014 nfs_fill_super(s, data);
54ceac45 2015 }
f7b422b1 2016
33852a1f 2017 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2018 if (IS_ERR(mntroot)) {
2019 error = PTR_ERR(mntroot);
2020 goto error_splat_super;
f7b422b1 2021 }
816724e6 2022
33852a1f 2023 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2024 if (error)
2025 goto error_splat_root;
2026
54ceac45
DH		 2027 s->s_flags |= MS_ACTIVE;
2028 mnt->mnt_sb = s;
2029 mnt->mnt_root = mntroot;
0655960f
CL		 2030 error = 0;
2031
2032out:
33852a1f
TM		 2033 kfree(data->nfs_server.hostname);
2034 kfree(data->mount_server.hostname);
2035 security_free_mnt_opts(&data->lsm_opts);
2036out_free_fh:
2037 kfree(mntfh);
2038 kfree(data);
0655960f 2039 return error;
816724e6 2040
54ceac45
DH		 2041out_err_nosb:
2042 nfs_free_server(server);
0655960f 2043 goto out;
54ceac45 2044
f9c3a380
EP		 2045error_splat_root:
2046 dput(mntroot);
54ceac45
DH		 2047error_splat_super:
2048 up_write(&s->s_umount);
2049 deactivate_super(s);
0655960f 2050 goto out;
f7b422b1
DH		 2051}
2052
54ceac45
DH		 2053/*
2054 * Destroy an NFS2/3 superblock
2055 */
f7b422b1
DH		 2056static void nfs_kill_super(struct super_block *s)
2057{
2058 struct nfs_server *server = NFS_SB(s);
2059
fa799759 2060 bdi_unregister(&server->backing_dev_info);
f7b422b1 2061 kill_anon_super(s);
54ceac45 2062 nfs_free_server(server);
f7b422b1
DH		 2063}
2064
54ceac45
DH		 2065/*
2066 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2067 */
2068static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2069 const char *dev_name, void *raw_data,
2070 struct vfsmount *mnt)
f7b422b1
DH		 2071{
2072 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2073 struct super_block *s;
2074 struct nfs_server *server;
2075 struct dentry *mntroot;
75180df2 2076 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2077 struct nfs_sb_mountdata sb_mntdata = {
2078 .mntflags = flags,
2079 };
54ceac45 2080 int error;
f7b422b1 2081
54ceac45 2082 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2083
54ceac45
DH		 2084 /* create a new volume representation */
2085 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2086 if (IS_ERR(server)) {
2087 error = PTR_ERR(server);
2088 goto out_err_noserver;
2089 }
e89a5a43 2090 sb_mntdata.server = server;
8fa5c000 2091
75180df2
TM		 2092 if (server->flags & NFS_MOUNT_UNSHARED)
2093 compare_super = NULL;
2094
54ceac45 2095 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2096 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2097 if (IS_ERR(s)) {
2098 error = PTR_ERR(s);
2099 goto out_err_nosb;
2100 }
5006a76c 2101
54ceac45
DH		 2102 if (s->s_fs_info != server) {
2103 nfs_free_server(server);
2104 server = NULL;
fa799759
MS		 2105 } else {
2106 error = nfs_bdi_register(server);
2107 if (error)
2108 goto error_splat_super;
f7b422b1 2109 }
24c8dbbb 2110
54ceac45
DH		 2111 if (!s->s_root) {
2112 /* initial superblock/root creation */
54ceac45
DH		 2113 nfs_clone_super(s, data->sb);
2114 }
f7b422b1 2115
54ceac45
DH		 2116 mntroot = nfs_get_root(s, data->fh);
2117 if (IS_ERR(mntroot)) {
2118 error = PTR_ERR(mntroot);
2119 goto error_splat_super;
f7b422b1 2120 }
e9cc6c23 2121 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2122 dput(mntroot);
2123 error = -ESTALE;
2124 goto error_splat_super;
2125 }
f7b422b1 2126
54ceac45
DH		 2127 s->s_flags |= MS_ACTIVE;
2128 mnt->mnt_sb = s;
2129 mnt->mnt_root = mntroot;
f7b422b1 2130
f9c3a380
EP		 2131 /* clone any lsm security options from the parent to the new sb */
2132 security_sb_clone_mnt_opts(data->sb, s);
2133
54ceac45
DH		 2134 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2135 return 0;
24c8dbbb 2136
54ceac45
DH		 2137out_err_nosb:
2138 nfs_free_server(server);
2139out_err_noserver:
2140 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2141 return error;
f7b422b1 2142
54ceac45
DH		 2143error_splat_super:
2144 up_write(&s->s_umount);
2145 deactivate_super(s);
2146 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2147 return error;
f7b422b1
DH		 2148}
2149
54ceac45
DH		 2150#ifdef CONFIG_NFS_V4
2151
f7b422b1 2152/*
54ceac45 2153 * Finish setting up a cloned NFS4 superblock
f7b422b1 2154 */
54ceac45
DH		 2155static void nfs4_clone_super(struct super_block *sb,
2156 const struct super_block *old_sb)
f7b422b1 2157{
54ceac45
DH		 2158 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2159 sb->s_blocksize = old_sb->s_blocksize;
2160 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2161 sb->s_time_gran = 1;
54ceac45
DH		 2162 sb->s_op = old_sb->s_op;
2163 nfs_initialise_sb(sb);
f7b422b1
DH		 2164}
2165
54ceac45
DH		 2166/*
2167 * Set up an NFS4 superblock
2168 */
2169static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2170{
54ceac45
DH		 2171 sb->s_time_gran = 1;
2172 sb->s_op = &nfs4_sops;
2173 nfs_initialise_sb(sb);
f7b422b1
DH		 2174}
2175
f0768ebd
CL		 2176/*
2177 * Validate NFSv4 mount options
2178 */
91ea40b9
TT		 2179static int nfs4_validate_mount_data(void *options,
2180 struct nfs_parsed_mount_data *args,
2181 const char *dev_name)
f0768ebd 2182{
4c568017 2183 struct sockaddr_in *ap;
91ea40b9 2184 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2185 char *c;
2186
2187 if (data == NULL)
2188 goto out_no_data;
2189
91ea40b9
TT		 2190 args->rsize = NFS_MAX_FILE_IO_SIZE;
2191 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2192 args->acregmin = NFS_DEF_ACREGMIN;
2193 args->acregmax = NFS_DEF_ACREGMAX;
2194 args->acdirmin = NFS_DEF_ACDIRMIN;
2195 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 2196 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
6738b251
CL		 2197 args->auth_flavors[0] = RPC_AUTH_UNIX;
2198 args->auth_flavor_len = 0;
91ea40b9 2199
f0768ebd
CL		 2200 switch (data->version) {
2201 case 1:
4c568017
CL		 2202 ap = (struct sockaddr_in *)&args->nfs_server.address;
2203 if (data->host_addrlen > sizeof(args->nfs_server.address))
2204 goto out_no_address;
2205 if (data->host_addrlen == 0)
f0768ebd 2206 goto out_no_address;
4c568017
CL		 2207 args->nfs_server.addrlen = data->host_addrlen;
2208 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
f0768ebd 2209 return -EFAULT;
91ea40b9
TT		 2210 if (!nfs_verify_server_address((struct sockaddr *)
2211 &args->nfs_server.address))
f0768ebd
CL		 2212 goto out_no_address;
2213
6738b251
CL		 2214 if (data->auth_flavourlen) {
2215 if (data->auth_flavourlen > 1)
2216 goto out_inval_auth;
20c71f5e 2217 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2218 data->auth_flavours,
20c71f5e 2219 sizeof(args->auth_flavors[0])))
f0768ebd 2220 return -EFAULT;
f0768ebd
CL		 2221 }
2222
2223 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2224 if (IS_ERR(c))
2225 return PTR_ERR(c);
91ea40b9 2226 args->nfs_server.hostname = c;
f0768ebd
CL		 2227
2228 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2229 if (IS_ERR(c))
2230 return PTR_ERR(c);
91ea40b9
TT		 2231 args->nfs_server.export_path = c;
2232 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2233
2234 c = strndup_user(data->client_addr.data, 16);
2235 if (IS_ERR(c))
2236 return PTR_ERR(c);
91ea40b9
TT		 2237 args->client_address = c;
2238
2239 /*
2240 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2241 * can deal with.
2242 */
2243
2244 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2245 args->rsize = data->rsize;
2246 args->wsize = data->wsize;
2247 args->timeo = data->timeo;
2248 args->retrans = data->retrans;
2249 args->acregmin = data->acregmin;
2250 args->acregmax = data->acregmax;
2251 args->acdirmin = data->acdirmin;
2252 args->acdirmax = data->acdirmax;
2253 args->nfs_server.protocol = data->proto;
259875ef 2254 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2255
2256 break;
80071225 2257 default: {
dc045898 2258 int status;
91ea40b9
TT		 2259
2260 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2261 return -EINVAL;
2262
2263 if (!nfs_verify_server_address((struct sockaddr *)
91ea40b9 2264 &args->nfs_server.address))
80071225 2265 return -EINVAL;
80071225 2266
ed596a8a
CL		 2267 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2268 args->nfs_server.port);
2269
259875ef
TM		 2270 nfs_validate_transport_protocol(args);
2271
6738b251 2272 if (args->auth_flavor_len > 1)
80071225 2273 goto out_inval_auth;
80071225 2274
91ea40b9 2275 if (args->client_address == NULL)
0a87cf12
JL		 2276 goto out_no_client_address;
2277
dc045898
CL		 2278 status = nfs_parse_devname(dev_name,
2279 &args->nfs_server.hostname,
2280 NFS4_MAXNAMLEN,
2281 &args->nfs_server.export_path,
2282 NFS4_MAXPATHLEN);
2283 if (status < 0)
2284 return status;
2285
80071225
CL		 2286 break;
2287 }
f0768ebd
CL		 2288 }
2289
2290 return 0;
2291
2292out_no_data:
2293 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2294 return -EINVAL;
2295
2296out_inval_auth:
2297 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2298 data->auth_flavourlen);
2299 return -EINVAL;
2300
2301out_no_address:
2302 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2303 return -EINVAL;
0a87cf12
JL		 2304
2305out_no_client_address:
2306 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2307 return -EINVAL;
f0768ebd
CL		 2308}
2309
54ceac45
DH		 2310/*
2311 * Get the superblock for an NFS4 mountpoint
2312 */
816724e6
TM		 2313static int nfs4_get_sb(struct file_system_type *fs_type,
2314 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2315{
33852a1f 2316 struct nfs_parsed_mount_data *data;
54ceac45
DH		 2317 struct super_block *s;
2318 struct nfs_server *server;
33852a1f 2319 struct nfs_fh *mntfh;
54ceac45 2320 struct dentry *mntroot;
75180df2 2321 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2322 struct nfs_sb_mountdata sb_mntdata = {
2323 .mntflags = flags,
2324 };
33852a1f
TM		 2325 int error = -ENOMEM;
2326
2327 data = kzalloc(sizeof(*data), GFP_KERNEL);
2328 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2329 if (data == NULL || mntfh == NULL)
2330 goto out_free_fh;
f7b422b1 2331
33852a1f 2332 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2333
f0768ebd 2334 /* Validate the mount data */
33852a1f 2335 error = nfs4_validate_mount_data(raw_data, data, dev_name);
f0768ebd
CL		 2336 if (error < 0)
2337 goto out;
f7b422b1 2338
54ceac45 2339 /* Get a volume representation */
33852a1f 2340 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2341 if (IS_ERR(server)) {
2342 error = PTR_ERR(server);
29eb981a 2343 goto out;
f7b422b1 2344 }
e89a5a43 2345 sb_mntdata.server = server;
f7b422b1 2346
75180df2
TM		 2347 if (server->flags & NFS4_MOUNT_UNSHARED)
2348 compare_super = NULL;
2349
54ceac45 2350 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2351 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2352 if (IS_ERR(s)) {
2353 error = PTR_ERR(s);
f7b422b1 2354 goto out_free;
816724e6
TM		 2355 }
2356
5dd3177a
TM		 2357 if (s->s_fs_info != server) {
2358 nfs_free_server(server);
2359 server = NULL;
fa799759
MS		 2360 } else {
2361 error = nfs_bdi_register(server);
2362 if (error)
2363 goto error_splat_super;
5dd3177a
TM		 2364 }
2365
54ceac45
DH		 2366 if (!s->s_root) {
2367 /* initial superblock/root creation */
54ceac45 2368 nfs4_fill_super(s);
54ceac45 2369 }
f7b422b1 2370
33852a1f 2371 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2372 if (IS_ERR(mntroot)) {
2373 error = PTR_ERR(mntroot);
2374 goto error_splat_super;
f7b422b1 2375 }
54ceac45 2376
33852a1f 2377 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2378 if (error)
2379 goto error_splat_root;
2380
f7b422b1 2381 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2382 mnt->mnt_sb = s;
2383 mnt->mnt_root = mntroot;
29eb981a
CL		 2384 error = 0;
2385
2386out:
33852a1f
TM		 2387 kfree(data->client_address);
2388 kfree(data->nfs_server.export_path);
2389 kfree(data->nfs_server.hostname);
2390 security_free_mnt_opts(&data->lsm_opts);
2391out_free_fh:
2392 kfree(mntfh);
2393 kfree(data);
29eb981a 2394 return error;
54ceac45 2395
f7b422b1 2396out_free:
54ceac45 2397 nfs_free_server(server);
29eb981a 2398 goto out;
54ceac45 2399
46c8ac74
EP		 2400error_splat_root:
2401 dput(mntroot);
54ceac45
DH		 2402error_splat_super:
2403 up_write(&s->s_umount);
2404 deactivate_super(s);
29eb981a 2405 goto out;
f7b422b1
DH		 2406}
2407
2408static void nfs4_kill_super(struct super_block *sb)
2409{
2410 struct nfs_server *server = NFS_SB(sb);
2411
2412 nfs_return_all_delegations(sb);
2413 kill_anon_super(sb);
2414
2415 nfs4_renewd_prepare_shutdown(server);
54ceac45 2416 nfs_free_server(server);
f7b422b1
DH		 2417}
2418
2419/*
54ceac45 2420 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2421 */
54ceac45
DH		 2422static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2423 const char *dev_name, void *raw_data,
2424 struct vfsmount *mnt)
f7b422b1 2425{
54ceac45
DH		 2426 struct nfs_clone_mount *data = raw_data;
2427 struct super_block *s;
2428 struct nfs_server *server;
2429 struct dentry *mntroot;
75180df2 2430 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2431 struct nfs_sb_mountdata sb_mntdata = {
2432 .mntflags = flags,
2433 };
54ceac45 2434 int error;
f7b422b1 2435
54ceac45 2436 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2437
54ceac45
DH		 2438 /* create a new volume representation */
2439 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2440 if (IS_ERR(server)) {
2441 error = PTR_ERR(server);
2442 goto out_err_noserver;
f7b422b1 2443 }
e89a5a43 2444 sb_mntdata.server = server;
f7b422b1 2445
75180df2
TM		 2446 if (server->flags & NFS4_MOUNT_UNSHARED)
2447 compare_super = NULL;
2448
54ceac45 2449 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2450 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2451 if (IS_ERR(s)) {
2452 error = PTR_ERR(s);
2453 goto out_err_nosb;
f7b422b1 2454 }
f7b422b1 2455
54ceac45
DH		 2456 if (s->s_fs_info != server) {
2457 nfs_free_server(server);
2458 server = NULL;
fa799759
MS		 2459 } else {
2460 error = nfs_bdi_register(server);
2461 if (error)
2462 goto error_splat_super;
54ceac45 2463 }
f7b422b1 2464
54ceac45
DH		 2465 if (!s->s_root) {
2466 /* initial superblock/root creation */
54ceac45
DH		 2467 nfs4_clone_super(s, data->sb);
2468 }
f7b422b1 2469
54ceac45
DH		 2470 mntroot = nfs4_get_root(s, data->fh);
2471 if (IS_ERR(mntroot)) {
2472 error = PTR_ERR(mntroot);
2473 goto error_splat_super;
2474 }
e9cc6c23
TM		 2475 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2476 dput(mntroot);
2477 error = -ESTALE;
2478 goto error_splat_super;
2479 }
f7b422b1 2480
54ceac45
DH		 2481 s->s_flags |= MS_ACTIVE;
2482 mnt->mnt_sb = s;
2483 mnt->mnt_root = mntroot;
2484
46c8ac74
EP		 2485 security_sb_clone_mnt_opts(data->sb, s);
2486
54ceac45
DH		 2487 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2488 return 0;
2489
2490out_err_nosb:
2491 nfs_free_server(server);
2492out_err_noserver:
2493 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2494 return error;
2495
2496error_splat_super:
2497 up_write(&s->s_umount);
2498 deactivate_super(s);
2499 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2500 return error;
f7b422b1
DH		 2501}
2502
54ceac45
DH		 2503/*
2504 * Create an NFS4 server record on referral traversal
2505 */
2506static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2507 const char *dev_name, void *raw_data,
2508 struct vfsmount *mnt)
f7b422b1
DH		 2509{
2510 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2511 struct super_block *s;
2512 struct nfs_server *server;
2513 struct dentry *mntroot;
2514 struct nfs_fh mntfh;
75180df2 2515 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2516 struct nfs_sb_mountdata sb_mntdata = {
2517 .mntflags = flags,
2518 };
54ceac45
DH		 2519 int error;
2520
2521 dprintk("--> nfs4_referral_get_sb()\n");
2522
2523 /* create a new volume representation */
2524 server = nfs4_create_referral_server(data, &mntfh);
2525 if (IS_ERR(server)) {
2526 error = PTR_ERR(server);
2527 goto out_err_noserver;
2528 }
e89a5a43 2529 sb_mntdata.server = server;
54ceac45 2530
75180df2
TM		 2531 if (server->flags & NFS4_MOUNT_UNSHARED)
2532 compare_super = NULL;
2533
54ceac45 2534 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2535 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2536 if (IS_ERR(s)) {
2537 error = PTR_ERR(s);
2538 goto out_err_nosb;
2539 }
2540
2541 if (s->s_fs_info != server) {
2542 nfs_free_server(server);
2543 server = NULL;
fa799759
MS		 2544 } else {
2545 error = nfs_bdi_register(server);
2546 if (error)
2547 goto error_splat_super;
54ceac45
DH		 2548 }
2549
2550 if (!s->s_root) {
2551 /* initial superblock/root creation */
54ceac45
DH		 2552 nfs4_fill_super(s);
2553 }
2554
f2d0d85e 2555 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2556 if (IS_ERR(mntroot)) {
2557 error = PTR_ERR(mntroot);
2558 goto error_splat_super;
2559 }
e9cc6c23
TM		 2560 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2561 dput(mntroot);
2562 error = -ESTALE;
2563 goto error_splat_super;
2564 }
54ceac45
DH		 2565
2566 s->s_flags |= MS_ACTIVE;
2567 mnt->mnt_sb = s;
2568 mnt->mnt_root = mntroot;
2569
46c8ac74
EP		 2570 security_sb_clone_mnt_opts(data->sb, s);
2571
54ceac45
DH		 2572 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2573 return 0;
2574
2575out_err_nosb:
2576 nfs_free_server(server);
2577out_err_noserver:
2578 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2579 return error;
2580
2581error_splat_super:
2582 up_write(&s->s_umount);
2583 deactivate_super(s);
2584 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2585 return error;
f7b422b1
DH		 2586}
2587
54ceac45 2588#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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