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fs: replace NIPQUAD()
[linux-2.6-block.git] / fs / nfs / super.c
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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>
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
a447c093 102static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 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
a447c093 169static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768
CL		 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
a447c093 186static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 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;
be859405 465 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 466 break;
467 }
468 case AF_INET6: {
469 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
5b095d98 470 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
82d101d5
CL		 471 break;
472 }
473 default:
474 if (showdefaults)
475 seq_printf(m, ",mountaddr=unspecified");
476 }
477
478 if (nfss->mountd_version || showdefaults)
479 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
480 if (nfss->mountd_port || showdefaults)
481 seq_printf(m, ",mountport=%u", nfss->mountd_port);
482
483 switch (nfss->mountd_protocol) {
484 case IPPROTO_UDP:
485 seq_printf(m, ",mountproto=udp");
486 break;
487 case IPPROTO_TCP:
488 seq_printf(m, ",mountproto=tcp");
489 break;
490 default:
491 if (showdefaults)
492 seq_printf(m, ",mountproto=auto");
493 }
494}
495
f7b422b1
DH		 496/*
497 * Describe the mount options in force on this server representation
498 */
82d101d5
CL		 499static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
500 int showdefaults)
f7b422b1 501{
509de811 502 static const struct proc_nfs_info {
f7b422b1 503 int flag;
509de811
DH		 504 const char *str;
505 const char *nostr;
f7b422b1
DH		 506 } nfs_info[] = {
507 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5
CL		 508 { NFS_MOUNT_INTR, ",intr", ",nointr" },
509 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 510 { NFS_MOUNT_NOCTO, ",nocto", "" },
511 { NFS_MOUNT_NOAC, ",noac", "" },
512 { NFS_MOUNT_NONLM, ",nolock", "" },
513 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 514 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
75180df2 515 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
f7b422b1
DH		 516 { 0, NULL, NULL }
517 };
509de811 518 const struct proc_nfs_info *nfs_infop;
8fa5c000 519 struct nfs_client *clp = nfss->nfs_client;
82d101d5 520 u32 version = clp->rpc_ops->version;
f7b422b1 521
82d101d5 522 seq_printf(m, ",vers=%u", version);
2d767432
CL		 523 seq_printf(m, ",rsize=%u", nfss->rsize);
524 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 525 if (nfss->bsize != 0)
526 seq_printf(m, ",bsize=%u", nfss->bsize);
527 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 528 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 529 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 530 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 531 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 532 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 533 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 534 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 535 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 536 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
537 if (nfss->flags & nfs_infop->flag)
538 seq_puts(m, nfs_infop->str);
539 else
540 seq_puts(m, nfs_infop->nostr);
541 }
56928edd
TT		 542 seq_printf(m, ",proto=%s",
543 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 544 if (version == 4) {
545 if (nfss->port != NFS_PORT)
546 seq_printf(m, ",port=%u", nfss->port);
547 } else
548 if (nfss->port)
549 seq_printf(m, ",port=%u", nfss->port);
550
33170233
TM		 551 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
552 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 553 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 554
555 if (version != 4)
556 nfs_show_mountd_options(m, nfss, showdefaults);
557
558#ifdef CONFIG_NFS_V4
559 if (clp->rpc_ops->version == 4)
560 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
561#endif
f7b422b1
DH		 562}
563
564/*
565 * Describe the mount options on this VFS mountpoint
566 */
567static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
568{
569 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
570
571 nfs_show_mount_options(m, nfss, 0);
572
5d8515ca
CL		 573 seq_printf(m, ",addr=%s",
574 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
575 RPC_DISPLAY_ADDR));
f7b422b1
DH		 576
577 return 0;
578}
579
580/*
581 * Present statistical information for this VFS mountpoint
582 */
583static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
584{
585 int i, cpu;
586 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
587 struct rpc_auth *auth = nfss->client->cl_auth;
588 struct nfs_iostats totals = { };
589
590 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
591
592 /*
593 * Display all mount option settings
594 */
595 seq_printf(m, "\n\topts:\t");
596 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
597 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
598 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
599 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
600 nfs_show_mount_options(m, nfss, 1);
601
602 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
603
604 seq_printf(m, "\n\tcaps:\t");
605 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 606 seq_printf(m, ",wtmult=%u", nfss->wtmult);
607 seq_printf(m, ",dtsize=%u", nfss->dtsize);
608 seq_printf(m, ",bsize=%u", nfss->bsize);
609 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 610
611#ifdef CONFIG_NFS_V4
40c55319 612 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 613 seq_printf(m, "\n\tnfsv4:\t");
614 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
615 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
616 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
617 }
618#endif
619
620 /*
621 * Display security flavor in effect for this mount
622 */
2d767432 623 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 624 if (auth->au_flavor)
2d767432 625 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 626
627 /*
628 * Display superblock I/O counters
629 */
630 for_each_possible_cpu(cpu) {
631 struct nfs_iostats *stats;
632
633 preempt_disable();
634 stats = per_cpu_ptr(nfss->io_stats, cpu);
635
636 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
637 totals.events[i] += stats->events[i];
638 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
639 totals.bytes[i] += stats->bytes[i];
640
641 preempt_enable();
642 }
643
644 seq_printf(m, "\n\tevents:\t");
645 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
646 seq_printf(m, "%lu ", totals.events[i]);
647 seq_printf(m, "\n\tbytes:\t");
648 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
649 seq_printf(m, "%Lu ", totals.bytes[i]);
650 seq_printf(m, "\n");
651
652 rpc_print_iostats(m, nfss->client);
653
654 return 0;
655}
656
657/*
658 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 659 * in response to xdev traversals and referrals
f7b422b1 660 */
42faad99 661static void nfs_umount_begin(struct super_block *sb)
f7b422b1 662{
42faad99 663 struct nfs_server *server = NFS_SB(sb);
fc6ae3cf
TM		 664 struct rpc_clnt *rpc;
665
fc6ae3cf
TM		 666 /* -EIO all pending I/O */
667 rpc = server->client_acl;
668 if (!IS_ERR(rpc))
669 rpc_killall_tasks(rpc);
670 rpc = server->client;
671 if (!IS_ERR(rpc))
672 rpc_killall_tasks(rpc);
f7b422b1
DH		 673}
674
fc50d58f 675/*
cdcd7f9a
CL		 676 * Sanity-check a server address provided by the mount command.
677 *
678 * Address family must be initialized, and address must not be
679 * the ANY address for that family.
fc50d58f
CL		 680 */
681static int nfs_verify_server_address(struct sockaddr *addr)
682{
683 switch (addr->sa_family) {
684 case AF_INET: {
cdcd7f9a 685 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 686 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 687 }
688 case AF_INET6: {
689 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
690 return !ipv6_addr_any(sa);
fc50d58f
CL		 691 }
692 }
693
694 return 0;
695}
696
ce3b7e19
CL		 697static void nfs_parse_ipv4_address(char *string, size_t str_len,
698 struct sockaddr *sap, size_t *addr_len)
9412b927 699{
ce3b7e19
CL		 700 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
701 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
9412b927 702
ce3b7e19
CL		 703 if (str_len <= INET_ADDRSTRLEN) {
704 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
705 (int)str_len, string);
706
707 sin->sin_family = AF_INET;
708 *addr_len = sizeof(*sin);
709 if (in4_pton(string, str_len, addr, '\0', NULL))
3c7c7e48 710 return;
ce3b7e19
CL		 711 }
712
713 sap->sa_family = AF_UNSPEC;
714 *addr_len = 0;
715}
716
717#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5e2e7721
CL		 718static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
719 const char *delim,
720 struct sockaddr_in6 *sin6)
d8e7748a
CL		 721{
722 char *p;
723 size_t len;
724
5e2e7721
CL		 725 if ((string + str_len) == delim)
726 return 1;
727
d8e7748a 728 if (*delim != IPV6_SCOPE_DELIMITER)
5e2e7721
CL		 729 return 0;
730
731 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
732 return 0;
d8e7748a
CL		 733
734 len = (string + str_len) - delim - 1;
735 p = kstrndup(delim + 1, len, GFP_KERNEL);
736 if (p) {
737 unsigned long scope_id = 0;
738 struct net_device *dev;
739
740 dev = dev_get_by_name(&init_net, p);
741 if (dev != NULL) {
742 scope_id = dev->ifindex;
743 dev_put(dev);
744 } else {
5e2e7721
CL		 745 if (strict_strtoul(p, 10, &scope_id) == 0) {
746 kfree(p);
747 return 0;
748 }
d8e7748a
CL		 749 }
750
751 kfree(p);
5e2e7721 752
d8e7748a
CL		 753 sin6->sin6_scope_id = scope_id;
754 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
5e2e7721 755 return 1;
d8e7748a 756 }
5e2e7721
CL		 757
758 return 0;
d8e7748a
CL		 759}
760
ce3b7e19
CL		 761static void nfs_parse_ipv6_address(char *string, size_t str_len,
762 struct sockaddr *sap, size_t *addr_len)
763{
764 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
765 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
d8e7748a 766 const char *delim;
ce3b7e19
CL		 767
768 if (str_len <= INET6_ADDRSTRLEN) {
769 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
770 (int)str_len, string);
3c7c7e48 771
ce3b7e19
CL		 772 sin6->sin6_family = AF_INET6;
773 *addr_len = sizeof(*sin6);
5e2e7721
CL		 774 if (in6_pton(string, str_len, addr,
775 IPV6_SCOPE_DELIMITER, &delim) != 0) {
776 if (nfs_parse_ipv6_scope_id(string, str_len,
777 delim, sin6) != 0)
778 return;
d8e7748a 779 }
3c7c7e48 780 }
9412b927
CL		 781
782 sap->sa_family = AF_UNSPEC;
ce3b7e19
CL		 783 *addr_len = 0;
784}
785#else
786static void nfs_parse_ipv6_address(char *string, size_t str_len,
787 struct sockaddr *sap, size_t *addr_len)
788{
789 sap->sa_family = AF_UNSPEC;
790 *addr_len = 0;
791}
792#endif
793
794/*
795 * Construct a sockaddr based on the contents of a string that contains
796 * an IP address in presentation format.
797 *
798 * If there is a problem constructing the new sockaddr, set the address
799 * family to AF_UNSPEC.
800 */
ea31a443 801void nfs_parse_ip_address(char *string, size_t str_len,
ce3b7e19
CL		 802 struct sockaddr *sap, size_t *addr_len)
803{
804 unsigned int i, colons;
805
806 colons = 0;
807 for (i = 0; i < str_len; i++)
808 if (string[i] == ':')
809 colons++;
810
811 if (colons >= 2)
812 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
813 else
814 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
9412b927
CL		 815}
816
259875ef
TM		 817/*
818 * Sanity check the NFS transport protocol.
819 *
820 */
821static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
822{
823 switch (mnt->nfs_server.protocol) {
824 case XPRT_TRANSPORT_UDP:
825 case XPRT_TRANSPORT_TCP:
826 case XPRT_TRANSPORT_RDMA:
827 break;
828 default:
829 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
830 }
831}
832
833/*
834 * For text based NFSv2/v3 mounts, the mount protocol transport default
835 * settings should depend upon the specified NFS transport.
836 */
837static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
838{
839 nfs_validate_transport_protocol(mnt);
840
841 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
842 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
843 return;
844 switch (mnt->nfs_server.protocol) {
845 case XPRT_TRANSPORT_UDP:
846 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
847 break;
848 case XPRT_TRANSPORT_TCP:
849 case XPRT_TRANSPORT_RDMA:
850 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
851 }
852}
853
01060c89
CL		 854/*
855 * Parse the value of the 'sec=' option.
856 *
dd07c947 857 * The flavor_len setting is for v4 mounts.
01060c89
CL		 858 */
859static int nfs_parse_security_flavors(char *value,
860 struct nfs_parsed_mount_data *mnt)
861{
862 substring_t args[MAX_OPT_ARGS];
863
864 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
865
866 switch (match_token(value, nfs_secflavor_tokens, args)) {
867 case Opt_sec_none:
01060c89
CL		 868 mnt->auth_flavor_len = 0;
869 mnt->auth_flavors[0] = RPC_AUTH_NULL;
870 break;
871 case Opt_sec_sys:
01060c89
CL		 872 mnt->auth_flavor_len = 0;
873 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
874 break;
875 case Opt_sec_krb5:
01060c89
CL		 876 mnt->auth_flavor_len = 1;
877 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
878 break;
879 case Opt_sec_krb5i:
01060c89
CL		 880 mnt->auth_flavor_len = 1;
881 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
882 break;
883 case Opt_sec_krb5p:
01060c89
CL		 884 mnt->auth_flavor_len = 1;
885 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
886 break;
887 case Opt_sec_lkey:
01060c89
CL		 888 mnt->auth_flavor_len = 1;
889 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
890 break;
891 case Opt_sec_lkeyi:
01060c89
CL		 892 mnt->auth_flavor_len = 1;
893 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
894 break;
895 case Opt_sec_lkeyp:
01060c89
CL		 896 mnt->auth_flavor_len = 1;
897 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
898 break;
899 case Opt_sec_spkm:
01060c89
CL		 900 mnt->auth_flavor_len = 1;
901 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
902 break;
903 case Opt_sec_spkmi:
01060c89
CL		 904 mnt->auth_flavor_len = 1;
905 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
906 break;
907 case Opt_sec_spkmp:
01060c89
CL		 908 mnt->auth_flavor_len = 1;
909 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
910 break;
911 default:
912 return 0;
913 }
914
915 return 1;
916}
917
f45663ce
CL		 918static void nfs_parse_invalid_value(const char *option)
919{
920 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
921}
922
bf0fd768
CL		 923/*
924 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 925 * a data structure. The whole mount string is processed; bad options are
926 * skipped as they are encountered. If there were no errors, return 1;
927 * otherwise return 0 (zero).
bf0fd768
CL		 928 */
929static int nfs_parse_mount_options(char *raw,
930 struct nfs_parsed_mount_data *mnt)
931{
f9c3a380 932 char *p, *string, *secdata;
f45663ce 933 int rc, sloppy = 0, errors = 0;
bf0fd768
CL		 934
935 if (!raw) {
936 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
937 return 1;
938 }
939 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
940
f9c3a380
EP		 941 secdata = alloc_secdata();
942 if (!secdata)
943 goto out_nomem;
944
945 rc = security_sb_copy_data(raw, secdata);
946 if (rc)
947 goto out_security_failure;
948
949 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
950 if (rc)
951 goto out_security_failure;
952
953 free_secdata(secdata);
954
bf0fd768
CL		 955 while ((p = strsep(&raw, ",")) != NULL) {
956 substring_t args[MAX_OPT_ARGS];
957 int option, token;
958
959 if (!*p)
960 continue;
961
962 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
963
964 token = match_token(p, nfs_mount_option_tokens, args);
965 switch (token) {
f45663ce
CL		 966
967 /*
968 * boolean options: foo/nofoo
969 */
bf0fd768
CL		 970 case Opt_soft:
971 mnt->flags |= NFS_MOUNT_SOFT;
972 break;
973 case Opt_hard:
974 mnt->flags &= ~NFS_MOUNT_SOFT;
975 break;
bf0fd768
CL		 976 case Opt_posix:
977 mnt->flags |= NFS_MOUNT_POSIX;
978 break;
979 case Opt_noposix:
980 mnt->flags &= ~NFS_MOUNT_POSIX;
981 break;
982 case Opt_cto:
983 mnt->flags &= ~NFS_MOUNT_NOCTO;
984 break;
985 case Opt_nocto:
986 mnt->flags |= NFS_MOUNT_NOCTO;
987 break;
988 case Opt_ac:
989 mnt->flags &= ~NFS_MOUNT_NOAC;
990 break;
991 case Opt_noac:
992 mnt->flags |= NFS_MOUNT_NOAC;
993 break;
994 case Opt_lock:
995 mnt->flags &= ~NFS_MOUNT_NONLM;
996 break;
997 case Opt_nolock:
998 mnt->flags |= NFS_MOUNT_NONLM;
999 break;
1000 case Opt_v2:
1001 mnt->flags &= ~NFS_MOUNT_VER3;
1002 break;
1003 case Opt_v3:
1004 mnt->flags |= NFS_MOUNT_VER3;
1005 break;
1006 case Opt_udp:
1007 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1008 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1009 break;
1010 case Opt_tcp:
1011 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1012 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1013 break;
2cf7ff7a
TT		 1014 case Opt_rdma:
1015 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1016 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
2cf7ff7a 1017 break;
bf0fd768
CL		 1018 case Opt_acl:
1019 mnt->flags &= ~NFS_MOUNT_NOACL;
1020 break;
1021 case Opt_noacl:
1022 mnt->flags |= NFS_MOUNT_NOACL;
1023 break;
1024 case Opt_rdirplus:
1025 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1026 break;
1027 case Opt_nordirplus:
1028 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1029 break;
75180df2
TM		 1030 case Opt_sharecache:
1031 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1032 break;
1033 case Opt_nosharecache:
1034 mnt->flags |= NFS_MOUNT_UNSHARED;
1035 break;
bf0fd768 1036
f45663ce
CL		 1037 /*
1038 * options that take numeric values
1039 */
bf0fd768 1040 case Opt_port:
f45663ce
CL		 1041 if (match_int(args, &option) ||
1042 option < 0 || option > USHORT_MAX) {
1043 errors++;
1044 nfs_parse_invalid_value("port");
1045 } else
1046 mnt->nfs_server.port = option;
bf0fd768
CL		 1047 break;
1048 case Opt_rsize:
f45663ce
CL		 1049 if (match_int(args, &option) || option < 0) {
1050 errors++;
1051 nfs_parse_invalid_value("rsize");
1052 } else
1053 mnt->rsize = option;
bf0fd768
CL		 1054 break;
1055 case Opt_wsize:
f45663ce
CL		 1056 if (match_int(args, &option) || option < 0) {
1057 errors++;
1058 nfs_parse_invalid_value("wsize");
1059 } else
1060 mnt->wsize = option;
bf0fd768
CL		 1061 break;
1062 case Opt_bsize:
f45663ce
CL		 1063 if (match_int(args, &option) || option < 0) {
1064 errors++;
1065 nfs_parse_invalid_value("bsize");
1066 } else
1067 mnt->bsize = option;
bf0fd768
CL		 1068 break;
1069 case Opt_timeo:
f45663ce
CL		 1070 if (match_int(args, &option) || option <= 0) {
1071 errors++;
1072 nfs_parse_invalid_value("timeo");
1073 } else
1074 mnt->timeo = option;
bf0fd768
CL		 1075 break;
1076 case Opt_retrans:
f45663ce
CL		 1077 if (match_int(args, &option) || option <= 0) {
1078 errors++;
1079 nfs_parse_invalid_value("retrans");
1080 } else
1081 mnt->retrans = option;
bf0fd768
CL		 1082 break;
1083 case Opt_acregmin:
f45663ce
CL		 1084 if (match_int(args, &option) || option < 0) {
1085 errors++;
1086 nfs_parse_invalid_value("acregmin");
1087 } else
1088 mnt->acregmin = option;
bf0fd768
CL		 1089 break;
1090 case Opt_acregmax:
f45663ce
CL		 1091 if (match_int(args, &option) || option < 0) {
1092 errors++;
1093 nfs_parse_invalid_value("acregmax");
1094 } else
1095 mnt->acregmax = option;
bf0fd768
CL		 1096 break;
1097 case Opt_acdirmin:
f45663ce
CL		 1098 if (match_int(args, &option) || option < 0) {
1099 errors++;
1100 nfs_parse_invalid_value("acdirmin");
1101 } else
1102 mnt->acdirmin = option;
bf0fd768
CL		 1103 break;
1104 case Opt_acdirmax:
f45663ce
CL		 1105 if (match_int(args, &option) || option < 0) {
1106 errors++;
1107 nfs_parse_invalid_value("acdirmax");
1108 } else
1109 mnt->acdirmax = option;
bf0fd768
CL		 1110 break;
1111 case Opt_actimeo:
f45663ce
CL		 1112 if (match_int(args, &option) || option < 0) {
1113 errors++;
1114 nfs_parse_invalid_value("actimeo");
1115 } else
1116 mnt->acregmin = mnt->acregmax =
1117 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1118 break;
1119 case Opt_namelen:
f45663ce
CL		 1120 if (match_int(args, &option) || option < 0) {
1121 errors++;
1122 nfs_parse_invalid_value("namlen");
1123 } else
1124 mnt->namlen = option;
bf0fd768
CL		 1125 break;
1126 case Opt_mountport:
f45663ce
CL		 1127 if (match_int(args, &option) ||
1128 option < 0 || option > USHORT_MAX) {
1129 errors++;
1130 nfs_parse_invalid_value("mountport");
1131 } else
1132 mnt->mount_server.port = option;
bf0fd768 1133 break;
bf0fd768 1134 case Opt_mountvers:
f45663ce
CL		 1135 if (match_int(args, &option) ||
1136 option < NFS_MNT_VERSION ||
1137 option > NFS_MNT3_VERSION) {
1138 errors++;
1139 nfs_parse_invalid_value("mountvers");
1140 } else
1141 mnt->mount_server.version = option;
bf0fd768 1142 break;
bf0fd768 1143 case Opt_nfsvers:
f45663ce
CL		 1144 if (match_int(args, &option)) {
1145 errors++;
1146 nfs_parse_invalid_value("nfsvers");
1147 break;
1148 }
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:
f45663ce
CL		 1157 errors++;
1158 nfs_parse_invalid_value("nfsvers");
bf0fd768
CL		 1159 }
1160 break;
1161
f45663ce
CL		 1162 /*
1163 * options that take text values
1164 */
bf0fd768
CL		 1165 case Opt_sec:
1166 string = match_strdup(args);
1167 if (string == NULL)
1168 goto out_nomem;
01060c89 1169 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1170 kfree(string);
f45663ce
CL		 1171 if (!rc) {
1172 errors++;
1173 dfprintk(MOUNT, "NFS: unrecognized "
1174 "security flavor\n");
1175 }
bf0fd768
CL		 1176 break;
1177 case Opt_proto:
1178 string = match_strdup(args);
1179 if (string == NULL)
1180 goto out_nomem;
1181 token = match_token(string,
1182 nfs_xprt_protocol_tokens, args);
1183 kfree(string);
1184
1185 switch (token) {
fdb66ff4 1186 case Opt_xprt_udp:
bf0fd768 1187 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1188 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1189 break;
fdb66ff4 1190 case Opt_xprt_tcp:
bf0fd768 1191 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1192 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1193 break;
2cf7ff7a
TT		 1194 case Opt_xprt_rdma:
1195 /* vector side protocols to TCP */
1196 mnt->flags |= NFS_MOUNT_TCP;
1197 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
2cf7ff7a 1198 break;
bf0fd768 1199 default:
f45663ce
CL		 1200 errors++;
1201 dfprintk(MOUNT, "NFS: unrecognized "
1202 "transport protocol\n");
bf0fd768
CL		 1203 }
1204 break;
1205 case Opt_mountproto:
1206 string = match_strdup(args);
1207 if (string == NULL)
1208 goto out_nomem;
1209 token = match_token(string,
1210 nfs_xprt_protocol_tokens, args);
1211 kfree(string);
1212
1213 switch (token) {
fdb66ff4 1214 case Opt_xprt_udp:
0896a725 1215 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1216 break;
fdb66ff4 1217 case Opt_xprt_tcp:
0896a725 1218 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1219 break;
2cf7ff7a 1220 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1221 default:
f45663ce
CL		 1222 errors++;
1223 dfprintk(MOUNT, "NFS: unrecognized "
1224 "transport protocol\n");
bf0fd768
CL		 1225 }
1226 break;
1227 case Opt_addr:
1228 string = match_strdup(args);
1229 if (string == NULL)
1230 goto out_nomem;
ce3b7e19
CL		 1231 nfs_parse_ip_address(string, strlen(string),
1232 (struct sockaddr *)
1233 &mnt->nfs_server.address,
1234 &mnt->nfs_server.addrlen);
bf0fd768
CL		 1235 kfree(string);
1236 break;
1237 case Opt_clientaddr:
1238 string = match_strdup(args);
1239 if (string == NULL)
1240 goto out_nomem;
fc601477 1241 kfree(mnt->client_address);
bf0fd768
CL		 1242 mnt->client_address = string;
1243 break;
33832034
CL		 1244 case Opt_mounthost:
1245 string = match_strdup(args);
1246 if (string == NULL)
1247 goto out_nomem;
fc601477 1248 kfree(mnt->mount_server.hostname);
33832034
CL		 1249 mnt->mount_server.hostname = string;
1250 break;
0ac83779 1251 case Opt_mountaddr:
bf0fd768
CL		 1252 string = match_strdup(args);
1253 if (string == NULL)
1254 goto out_nomem;
ce3b7e19
CL		 1255 nfs_parse_ip_address(string, strlen(string),
1256 (struct sockaddr *)
1257 &mnt->mount_server.address,
1258 &mnt->mount_server.addrlen);
bf0fd768
CL		 1259 kfree(string);
1260 break;
7973c1f1
TM		 1261 case Opt_lookupcache:
1262 string = match_strdup(args);
1263 if (string == NULL)
1264 goto out_nomem;
1265 token = match_token(string,
1266 nfs_lookupcache_tokens, args);
1267 kfree(string);
1268 switch (token) {
1269 case Opt_lookupcache_all:
1270 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1271 break;
1272 case Opt_lookupcache_positive:
1273 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1274 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1275 break;
1276 case Opt_lookupcache_none:
1277 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1278 break;
1279 default:
1280 errors++;
1281 dfprintk(MOUNT, "NFS: invalid "
1282 "lookupcache argument\n");
1283 };
1284 break;
bf0fd768 1285
f45663ce
CL		 1286 /*
1287 * Special options
1288 */
1289 case Opt_sloppy:
1290 sloppy = 1;
1291 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1292 break;
bf0fd768
CL		 1293 case Opt_userspace:
1294 case Opt_deprecated:
d33e4dfe
CL		 1295 dfprintk(MOUNT, "NFS: ignoring mount option "
1296 "'%s'\n", p);
bf0fd768
CL		 1297 break;
1298
1299 default:
f45663ce
CL		 1300 errors++;
1301 dfprintk(MOUNT, "NFS: unrecognized mount option "
1302 "'%s'\n", p);
bf0fd768
CL		 1303 }
1304 }
1305
af904dea
CL		 1306 if (errors > 0) {
1307 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1308 errors, (errors == 1 ? "" : "s"));
1309 if (!sloppy)
1310 return 0;
1311 }
bf0fd768
CL		 1312 return 1;
1313
1314out_nomem:
1315 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1316 return 0;
f9c3a380
EP		 1317out_security_failure:
1318 free_secdata(secdata);
1319 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1320 return 0;
bf0fd768
CL		 1321}
1322
0076d7b7
CL		 1323/*
1324 * Use the remote server's MOUNT service to request the NFS file handle
1325 * corresponding to the provided path.
1326 */
1327static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1328 struct nfs_fh *root_fh)
1329{
4c568017 1330 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
33832034 1331 char *hostname;
4c568017 1332 int status;
0076d7b7
CL		 1333
1334 if (args->mount_server.version == 0) {
1335 if (args->flags & NFS_MOUNT_VER3)
1336 args->mount_server.version = NFS_MNT3_VERSION;
1337 else
1338 args->mount_server.version = NFS_MNT_VERSION;
1339 }
1340
33832034
CL		 1341 if (args->mount_server.hostname)
1342 hostname = args->mount_server.hostname;
1343 else
1344 hostname = args->nfs_server.hostname;
1345
0076d7b7
CL		 1346 /*
1347 * Construct the mount server's address.
1348 */
4c568017
CL		 1349 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1350 memcpy(sap, &args->nfs_server.address,
1351 args->nfs_server.addrlen);
1352 args->mount_server.addrlen = args->nfs_server.addrlen;
1353 }
1354
aad70007
JL		 1355 /*
1356 * autobind will be used if mount_server.port == 0
1357 */
4c568017 1358 nfs_set_port(sap, args->mount_server.port);
0076d7b7
CL		 1359
1360 /*
1361 * Now ask the mount server to map our export path
1362 * to a file handle.
1363 */
4c568017
CL		 1364 status = nfs_mount(sap,
1365 args->mount_server.addrlen,
33832034 1366 hostname,
0076d7b7
CL		 1367 args->nfs_server.export_path,
1368 args->mount_server.version,
1369 args->mount_server.protocol,
1370 root_fh);
efd8340b
CL		 1371 if (status == 0)
1372 return 0;
0076d7b7 1373
396cee97 1374 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
33832034 1375 hostname, status);
0076d7b7
CL		 1376 return status;
1377}
1378
d1aa0825
CL		 1379static int nfs_parse_simple_hostname(const char *dev_name,
1380 char **hostname, size_t maxnamlen,
1381 char **export_path, size_t maxpathlen)
dc045898
CL		 1382{
1383 size_t len;
1384 char *colon, *comma;
1385
1386 colon = strchr(dev_name, ':');
1387 if (colon == NULL)
1388 goto out_bad_devname;
1389
1390 len = colon - dev_name;
1391 if (len > maxnamlen)
1392 goto out_hostname;
1393
1394 /* N.B. caller will free nfs_server.hostname in all cases */
1395 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1396 if (!*hostname)
1397 goto out_nomem;
1398
1399 /* kill possible hostname list: not supported */
1400 comma = strchr(*hostname, ',');
1401 if (comma != NULL) {
1402 if (comma == *hostname)
1403 goto out_bad_devname;
1404 *comma = '\0';
1405 }
1406
1407 colon++;
1408 len = strlen(colon);
1409 if (len > maxpathlen)
1410 goto out_path;
1411 *export_path = kstrndup(colon, len, GFP_KERNEL);
1412 if (!*export_path)
1413 goto out_nomem;
1414
1415 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1416 return 0;
1417
1418out_bad_devname:
1419 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1420 return -EINVAL;
1421
1422out_nomem:
1423 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1424 return -ENOMEM;
1425
1426out_hostname:
1427 dfprintk(MOUNT, "NFS: server hostname too long\n");
1428 return -ENAMETOOLONG;
1429
1430out_path:
1431 dfprintk(MOUNT, "NFS: export pathname too long\n");
1432 return -ENAMETOOLONG;
1433}
1434
d1aa0825
CL		 1435/*
1436 * Hostname has square brackets around it because it contains one or
1437 * more colons. We look for the first closing square bracket, and a
1438 * colon must follow it.
1439 */
1440static int nfs_parse_protected_hostname(const char *dev_name,
1441 char **hostname, size_t maxnamlen,
1442 char **export_path, size_t maxpathlen)
1443{
1444 size_t len;
1445 char *start, *end;
1446
1447 start = (char *)(dev_name + 1);
1448
1449 end = strchr(start, ']');
1450 if (end == NULL)
1451 goto out_bad_devname;
1452 if (*(end + 1) != ':')
1453 goto out_bad_devname;
1454
1455 len = end - start;
1456 if (len > maxnamlen)
1457 goto out_hostname;
1458
1459 /* N.B. caller will free nfs_server.hostname in all cases */
1460 *hostname = kstrndup(start, len, GFP_KERNEL);
1461 if (*hostname == NULL)
1462 goto out_nomem;
1463
1464 end += 2;
1465 len = strlen(end);
1466 if (len > maxpathlen)
1467 goto out_path;
1468 *export_path = kstrndup(end, len, GFP_KERNEL);
1469 if (!*export_path)
1470 goto out_nomem;
1471
1472 return 0;
1473
1474out_bad_devname:
1475 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1476 return -EINVAL;
1477
1478out_nomem:
1479 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1480 return -ENOMEM;
1481
1482out_hostname:
1483 dfprintk(MOUNT, "NFS: server hostname too long\n");
1484 return -ENAMETOOLONG;
1485
1486out_path:
1487 dfprintk(MOUNT, "NFS: export pathname too long\n");
1488 return -ENAMETOOLONG;
1489}
1490
1491/*
1492 * Split "dev_name" into "hostname:export_path".
1493 *
1494 * The leftmost colon demarks the split between the server's hostname
1495 * and the export path. If the hostname starts with a left square
1496 * bracket, then it may contain colons.
1497 *
1498 * Note: caller frees hostname and export path, even on error.
1499 */
1500static int nfs_parse_devname(const char *dev_name,
1501 char **hostname, size_t maxnamlen,
1502 char **export_path, size_t maxpathlen)
1503{
1504 if (*dev_name == '[')
1505 return nfs_parse_protected_hostname(dev_name,
1506 hostname, maxnamlen,
1507 export_path, maxpathlen);
1508
1509 return nfs_parse_simple_hostname(dev_name,
1510 hostname, maxnamlen,
1511 export_path, maxpathlen);
1512}
1513
f7b422b1 1514/*
54ceac45
DH		 1515 * Validate the NFS2/NFS3 mount data
1516 * - fills in the mount root filehandle
136d558c
CL		 1517 *
1518 * For option strings, user space handles the following behaviors:
1519 *
1520 * + DNS: mapping server host name to IP address ("addr=" option)
1521 *
1522 * + failure mode: how to behave if a mount request can't be handled
1523 * immediately ("fg/bg" option)
1524 *
1525 * + retry: how often to retry a mount request ("retry=" option)
1526 *
1527 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1528 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1529 */
2283f8d6
TT		 1530static int nfs_validate_mount_data(void *options,
1531 struct nfs_parsed_mount_data *args,
136d558c
CL		 1532 struct nfs_fh *mntfh,
1533 const char *dev_name)
f7b422b1 1534{
2283f8d6 1535 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
136d558c 1536
5df36e78
CL		 1537 if (data == NULL)
1538 goto out_no_data;
f7b422b1 1539
2283f8d6
TT		 1540 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1541 args->rsize = NFS_MAX_FILE_IO_SIZE;
1542 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1543 args->acregmin = NFS_DEF_ACREGMIN;
1544 args->acregmax = NFS_DEF_ACREGMAX;
1545 args->acdirmin = NFS_DEF_ACDIRMIN;
1546 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 1547 args->mount_server.port = 0; /* autobind unless user sets port */
f22d6d79 1548 args->nfs_server.port = 0; /* autobind unless user sets port */
0896a725 1549 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1550 args->auth_flavors[0] = RPC_AUTH_UNIX;
2283f8d6 1551
54ceac45 1552 switch (data->version) {
5df36e78
CL		 1553 case 1:
1554 data->namlen = 0;
1555 case 2:
1556 data->bsize = 0;
1557 case 3:
1558 if (data->flags & NFS_MOUNT_VER3)
1559 goto out_no_v3;
1560 data->root.size = NFS2_FHSIZE;
1561 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1562 case 4:
1563 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1564 goto out_no_sec;
1565 case 5:
1566 memset(data->context, 0, sizeof(data->context));
1567 case 6:
b7e24457
TM		 1568 if (data->flags & NFS_MOUNT_VER3) {
1569 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1570 goto out_invalid_fh;
5df36e78 1571 mntfh->size = data->root.size;
b7e24457 1572 } else
5df36e78
CL		 1573 mntfh->size = NFS2_FHSIZE;
1574
5df36e78
CL		 1575
1576 memcpy(mntfh->data, data->root.data, mntfh->size);
1577 if (mntfh->size < sizeof(mntfh->data))
1578 memset(mntfh->data + mntfh->size, 0,
1579 sizeof(mntfh->data) - mntfh->size);
6e88e061 1580
2283f8d6
TT		 1581 /*
1582 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1583 * can deal with.
1584 */
ff3525a5 1585 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1586 args->rsize = data->rsize;
1587 args->wsize = data->wsize;
2283f8d6
TT		 1588 args->timeo = data->timeo;
1589 args->retrans = data->retrans;
1590 args->acregmin = data->acregmin;
1591 args->acregmax = data->acregmax;
1592 args->acdirmin = data->acdirmin;
1593 args->acdirmax = data->acdirmax;
4c568017
CL		 1594
1595 memcpy(&args->nfs_server.address, &data->addr,
1596 sizeof(data->addr));
1597 args->nfs_server.addrlen = sizeof(data->addr);
1598 if (!nfs_verify_server_address((struct sockaddr *)
1599 &args->nfs_server.address))
1600 goto out_no_address;
1601
2283f8d6 1602 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1603 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1604 /* N.B. caller will free nfs_server.hostname in all cases */
1605 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1606 args->namlen = data->namlen;
1607 args->bsize = data->bsize;
dd07c947
CL		 1608
1609 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1610 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1611 if (!args->nfs_server.hostname)
1612 goto out_nomem;
f9c3a380
EP		 1613
1614 /*
1615 * The legacy version 6 binary mount data from userspace has a
1616 * field used only to transport selinux information into the
1617 * the kernel. To continue to support that functionality we
1618 * have a touch of selinux knowledge here in the NFS code. The
1619 * userspace code converted context=blah to just blah so we are
1620 * converting back to the full string selinux understands.
1621 */
1622 if (data->context[0]){
1623#ifdef CONFIG_SECURITY_SELINUX
1624 int rc;
1625 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1626 if (!opts_str)
1627 return -ENOMEM;
1628 strcpy(opts_str, "context=");
1629 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1630 strcat(opts_str, &data->context[0]);
1631 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1632 kfree(opts_str);
1633 if (rc)
1634 return rc;
1635#else
1636 return -EINVAL;
1637#endif
1638 }
1639
5df36e78 1640 break;
136d558c 1641 default: {
136d558c 1642 int status;
136d558c 1643
2283f8d6
TT		 1644 if (nfs_parse_mount_options((char *)options, args) == 0)
1645 return -EINVAL;
136d558c 1646
6e88e061
CL		 1647 if (!nfs_verify_server_address((struct sockaddr *)
1648 &args->nfs_server.address))
1649 goto out_no_address;
1650
ed596a8a
CL		 1651 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1652 args->nfs_server.port);
1653
259875ef
TM		 1654 nfs_set_mount_transport_protocol(args);
1655
dc045898
CL		 1656 status = nfs_parse_devname(dev_name,
1657 &args->nfs_server.hostname,
1658 PAGE_SIZE,
1659 &args->nfs_server.export_path,
1660 NFS_MAXPATHLEN);
1661 if (!status)
1662 status = nfs_try_mount(args, mntfh);
136d558c 1663
dc045898
CL		 1664 kfree(args->nfs_server.export_path);
1665 args->nfs_server.export_path = NULL;
136d558c 1666
136d558c 1667 if (status)
fdc6e2c8 1668 return status;
136d558c 1669
136d558c
CL		 1670 break;
1671 }
f7b422b1 1672 }
54ceac45
DH		 1673
1674#ifndef CONFIG_NFS_V3
2283f8d6 1675 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1676 goto out_v3_not_compiled;
1677#endif /* !CONFIG_NFS_V3 */
f7b422b1 1678
5df36e78 1679 return 0;
f7b422b1 1680
5df36e78
CL		 1681out_no_data:
1682 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1683 return -EINVAL;
54ceac45 1684
5df36e78
CL		 1685out_no_v3:
1686 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1687 data->version);
1688 return -EINVAL;
f7b422b1 1689
5df36e78
CL		 1690out_no_sec:
1691 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1692 return -EINVAL;
1693
5df36e78
CL		 1694#ifndef CONFIG_NFS_V3
1695out_v3_not_compiled:
1696 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1697 return -EPROTONOSUPPORT;
1698#endif /* !CONFIG_NFS_V3 */
1699
63649bd7
CG		 1700out_nomem:
1701 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1702 return -ENOMEM;
1703
5df36e78
CL		 1704out_no_address:
1705 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1706 return -EINVAL;
1707
1708out_invalid_fh:
1709 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1710 return -EINVAL;
f7b422b1
DH		 1711}
1712
48b605f8
JL		 1713static int
1714nfs_compare_remount_data(struct nfs_server *nfss,
1715 struct nfs_parsed_mount_data *data)
1716{
1717 if (data->flags != nfss->flags ||
1718 data->rsize != nfss->rsize ||
1719 data->wsize != nfss->wsize ||
1720 data->retrans != nfss->client->cl_timeout->to_retries ||
1721 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1722 data->acregmin != nfss->acregmin / HZ ||
1723 data->acregmax != nfss->acregmax / HZ ||
1724 data->acdirmin != nfss->acdirmin / HZ ||
1725 data->acdirmax != nfss->acdirmax / HZ ||
1726 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1727 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1728 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1729 data->nfs_server.addrlen) != 0)
1730 return -EINVAL;
1731
1732 return 0;
1733}
1734
1735static int
1736nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1737{
1738 int error;
1739 struct nfs_server *nfss = sb->s_fs_info;
1740 struct nfs_parsed_mount_data *data;
1741 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1742 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1743 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1744
1745 /*
1746 * Userspace mount programs that send binary options generally send
1747 * them populated with default values. We have no way to know which
1748 * ones were explicitly specified. Fall back to legacy behavior and
1749 * just return success.
1750 */
31c94469
MZ		 1751 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1752 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1753 options->version <= 6))))
48b605f8
JL		 1754 return 0;
1755
1756 data = kzalloc(sizeof(*data), GFP_KERNEL);
1757 if (data == NULL)
1758 return -ENOMEM;
1759
1760 /* fill out struct with values from existing mount */
1761 data->flags = nfss->flags;
1762 data->rsize = nfss->rsize;
1763 data->wsize = nfss->wsize;
1764 data->retrans = nfss->client->cl_timeout->to_retries;
1765 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1766 data->acregmin = nfss->acregmin / HZ;
1767 data->acregmax = nfss->acregmax / HZ;
1768 data->acdirmin = nfss->acdirmin / HZ;
1769 data->acdirmax = nfss->acdirmax / HZ;
1770 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1771 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1772 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1773 data->nfs_server.addrlen);
1774
1775 /* overwrite those values with any that were specified */
1776 error = nfs_parse_mount_options((char *)options, data);
1777 if (error < 0)
1778 goto out;
1779
1780 /* compare new mount options with old ones */
1781 error = nfs_compare_remount_data(nfss, data);
1782out:
1783 kfree(data);
1784 return error;
1785}
1786
f7b422b1 1787/*
54ceac45 1788 * Initialise the common bits of the superblock
f7b422b1 1789 */
54ceac45 1790static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1791{
54ceac45 1792 struct nfs_server *server = NFS_SB(sb);
5006a76c 1793
54ceac45 1794 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1795
54ceac45
DH		 1796 /* We probably want something more informative here */
1797 snprintf(sb->s_id, sizeof(sb->s_id),
1798 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1799
54ceac45
DH		 1800 if (sb->s_blocksize == 0)
1801 sb->s_blocksize = nfs_block_bits(server->wsize,
1802 &sb->s_blocksize_bits);
f7b422b1 1803
54ceac45
DH		 1804 if (server->flags & NFS_MOUNT_NOAC)
1805 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1806
54ceac45 1807 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1808}
1809
1810/*
54ceac45 1811 * Finish setting up an NFS2/3 superblock
f7b422b1 1812 */
2283f8d6
TT		 1813static void nfs_fill_super(struct super_block *sb,
1814 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1815{
1816 struct nfs_server *server = NFS_SB(sb);
5006a76c 1817
54ceac45
DH		 1818 sb->s_blocksize_bits = 0;
1819 sb->s_blocksize = 0;
1820 if (data->bsize)
1821 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1822
54ceac45
DH		 1823 if (server->flags & NFS_MOUNT_VER3) {
1824 /* The VFS shouldn't apply the umask to mode bits. We will do
1825 * so ourselves when necessary.
1826 */
1827 sb->s_flags |= MS_POSIXACL;
1828 sb->s_time_gran = 1;
816724e6 1829 }
54ceac45
DH		 1830
1831 sb->s_op = &nfs_sops;
1832 nfs_initialise_sb(sb);
f7b422b1
DH		 1833}
1834
1835/*
54ceac45 1836 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1837 */
54ceac45
DH		 1838static void nfs_clone_super(struct super_block *sb,
1839 const struct super_block *old_sb)
f7b422b1 1840{
54ceac45
DH		 1841 struct nfs_server *server = NFS_SB(sb);
1842
1843 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1844 sb->s_blocksize = old_sb->s_blocksize;
1845 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1846
f7b422b1 1847 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1848 /* The VFS shouldn't apply the umask to mode bits. We will do
1849 * so ourselves when necessary.
f7b422b1
DH		 1850 */
1851 sb->s_flags |= MS_POSIXACL;
f7b422b1 1852 sb->s_time_gran = 1;
f7b422b1
DH		 1853 }
1854
54ceac45
DH		 1855 sb->s_op = old_sb->s_op;
1856 nfs_initialise_sb(sb);
f7b422b1
DH		 1857}
1858
275a5d24
TM		 1859#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1860
1861static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1862{
1863 const struct nfs_server *a = s->s_fs_info;
1864 const struct rpc_clnt *clnt_a = a->client;
1865 const struct rpc_clnt *clnt_b = b->client;
1866
1867 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1868 goto Ebusy;
1869 if (a->nfs_client != b->nfs_client)
1870 goto Ebusy;
1871 if (a->flags != b->flags)
1872 goto Ebusy;
1873 if (a->wsize != b->wsize)
1874 goto Ebusy;
1875 if (a->rsize != b->rsize)
1876 goto Ebusy;
1877 if (a->acregmin != b->acregmin)
1878 goto Ebusy;
1879 if (a->acregmax != b->acregmax)
1880 goto Ebusy;
1881 if (a->acdirmin != b->acdirmin)
1882 goto Ebusy;
1883 if (a->acdirmax != b->acdirmax)
1884 goto Ebusy;
1885 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1886 goto Ebusy;
e89a5a43 1887 return 1;
275a5d24 1888Ebusy:
e89a5a43
TM		 1889 return 0;
1890}
1891
1892struct nfs_sb_mountdata {
1893 struct nfs_server *server;
1894 int mntflags;
1895};
1896
1897static int nfs_set_super(struct super_block *s, void *data)
1898{
1899 struct nfs_sb_mountdata *sb_mntdata = data;
1900 struct nfs_server *server = sb_mntdata->server;
1901 int ret;
1902
1903 s->s_flags = sb_mntdata->mntflags;
1904 s->s_fs_info = server;
1905 ret = set_anon_super(s, server);
1906 if (ret == 0)
1907 server->s_dev = s->s_dev;
1908 return ret;
1909}
1910
fd00a8ff
CL		 1911static int nfs_compare_super_address(struct nfs_server *server1,
1912 struct nfs_server *server2)
1913{
1914 struct sockaddr *sap1, *sap2;
1915
1916 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1917 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1918
1919 if (sap1->sa_family != sap2->sa_family)
1920 return 0;
1921
1922 switch (sap1->sa_family) {
1923 case AF_INET: {
1924 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1925 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1926 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1927 return 0;
1928 if (sin1->sin_port != sin2->sin_port)
1929 return 0;
1930 break;
1931 }
1932 case AF_INET6: {
1933 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1934 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1935 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1936 return 0;
1937 if (sin1->sin6_port != sin2->sin6_port)
1938 return 0;
1939 break;
1940 }
1941 default:
1942 return 0;
1943 }
1944
1945 return 1;
1946}
1947
e89a5a43
TM		 1948static int nfs_compare_super(struct super_block *sb, void *data)
1949{
1950 struct nfs_sb_mountdata *sb_mntdata = data;
1951 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1952 int mntflags = sb_mntdata->mntflags;
1953
fd00a8ff 1954 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 1955 return 0;
1956 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1957 if (old->flags & NFS_MOUNT_UNSHARED)
1958 return 0;
1959 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1960 return 0;
1961 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 1962}
1963
fa799759
MS		 1964static int nfs_bdi_register(struct nfs_server *server)
1965{
1966 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1967}
1968
816724e6
TM		 1969static int nfs_get_sb(struct file_system_type *fs_type,
1970 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 1971{
f7b422b1
DH		 1972 struct nfs_server *server = NULL;
1973 struct super_block *s;
33852a1f
TM		 1974 struct nfs_parsed_mount_data *data;
1975 struct nfs_fh *mntfh;
54ceac45 1976 struct dentry *mntroot;
75180df2 1977 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1978 struct nfs_sb_mountdata sb_mntdata = {
1979 .mntflags = flags,
1980 };
33852a1f
TM		 1981 int error = -ENOMEM;
1982
1983 data = kzalloc(sizeof(*data), GFP_KERNEL);
1984 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1985 if (data == NULL || mntfh == NULL)
1986 goto out_free_fh;
f7b422b1 1987
33852a1f 1988 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 1989
54ceac45 1990 /* Validate the mount data */
33852a1f 1991 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 1992 if (error < 0)
0655960f 1993 goto out;
f7b422b1 1994
54ceac45 1995 /* Get a volume representation */
33852a1f 1996 server = nfs_create_server(data, mntfh);
54ceac45
DH		 1997 if (IS_ERR(server)) {
1998 error = PTR_ERR(server);
0655960f 1999 goto out;
f7b422b1 2000 }
e89a5a43 2001 sb_mntdata.server = server;
f7b422b1 2002
75180df2
TM		 2003 if (server->flags & NFS_MOUNT_UNSHARED)
2004 compare_super = NULL;
2005
54ceac45 2006 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2007 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2008 if (IS_ERR(s)) {
2009 error = PTR_ERR(s);
54ceac45 2010 goto out_err_nosb;
816724e6
TM		 2011 }
2012
54ceac45
DH		 2013 if (s->s_fs_info != server) {
2014 nfs_free_server(server);
2015 server = NULL;
fa799759
MS		 2016 } else {
2017 error = nfs_bdi_register(server);
2018 if (error)
2019 goto error_splat_super;
54ceac45 2020 }
f7b422b1 2021
54ceac45
DH		 2022 if (!s->s_root) {
2023 /* initial superblock/root creation */
33852a1f 2024 nfs_fill_super(s, data);
54ceac45 2025 }
f7b422b1 2026
33852a1f 2027 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2028 if (IS_ERR(mntroot)) {
2029 error = PTR_ERR(mntroot);
2030 goto error_splat_super;
f7b422b1 2031 }
816724e6 2032
33852a1f 2033 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2034 if (error)
2035 goto error_splat_root;
2036
54ceac45
DH		 2037 s->s_flags |= MS_ACTIVE;
2038 mnt->mnt_sb = s;
2039 mnt->mnt_root = mntroot;
0655960f
CL		 2040 error = 0;
2041
2042out:
33852a1f
TM		 2043 kfree(data->nfs_server.hostname);
2044 kfree(data->mount_server.hostname);
2045 security_free_mnt_opts(&data->lsm_opts);
2046out_free_fh:
2047 kfree(mntfh);
2048 kfree(data);
0655960f 2049 return error;
816724e6 2050
54ceac45
DH		 2051out_err_nosb:
2052 nfs_free_server(server);
0655960f 2053 goto out;
54ceac45 2054
f9c3a380
EP		 2055error_splat_root:
2056 dput(mntroot);
54ceac45
DH		 2057error_splat_super:
2058 up_write(&s->s_umount);
2059 deactivate_super(s);
0655960f 2060 goto out;
f7b422b1
DH		 2061}
2062
54ceac45
DH		 2063/*
2064 * Destroy an NFS2/3 superblock
2065 */
f7b422b1
DH		 2066static void nfs_kill_super(struct super_block *s)
2067{
2068 struct nfs_server *server = NFS_SB(s);
2069
fa799759 2070 bdi_unregister(&server->backing_dev_info);
f7b422b1 2071 kill_anon_super(s);
54ceac45 2072 nfs_free_server(server);
f7b422b1
DH		 2073}
2074
54ceac45
DH		 2075/*
2076 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2077 */
2078static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2079 const char *dev_name, void *raw_data,
2080 struct vfsmount *mnt)
f7b422b1
DH		 2081{
2082 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2083 struct super_block *s;
2084 struct nfs_server *server;
2085 struct dentry *mntroot;
75180df2 2086 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2087 struct nfs_sb_mountdata sb_mntdata = {
2088 .mntflags = flags,
2089 };
54ceac45 2090 int error;
f7b422b1 2091
54ceac45 2092 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2093
54ceac45
DH		 2094 /* create a new volume representation */
2095 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2096 if (IS_ERR(server)) {
2097 error = PTR_ERR(server);
2098 goto out_err_noserver;
2099 }
e89a5a43 2100 sb_mntdata.server = server;
8fa5c000 2101
75180df2
TM		 2102 if (server->flags & NFS_MOUNT_UNSHARED)
2103 compare_super = NULL;
2104
54ceac45 2105 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2106 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2107 if (IS_ERR(s)) {
2108 error = PTR_ERR(s);
2109 goto out_err_nosb;
2110 }
5006a76c 2111
54ceac45
DH		 2112 if (s->s_fs_info != server) {
2113 nfs_free_server(server);
2114 server = NULL;
fa799759
MS		 2115 } else {
2116 error = nfs_bdi_register(server);
2117 if (error)
2118 goto error_splat_super;
f7b422b1 2119 }
24c8dbbb 2120
54ceac45
DH		 2121 if (!s->s_root) {
2122 /* initial superblock/root creation */
54ceac45
DH		 2123 nfs_clone_super(s, data->sb);
2124 }
f7b422b1 2125
54ceac45
DH		 2126 mntroot = nfs_get_root(s, data->fh);
2127 if (IS_ERR(mntroot)) {
2128 error = PTR_ERR(mntroot);
2129 goto error_splat_super;
f7b422b1 2130 }
e9cc6c23 2131 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2132 dput(mntroot);
2133 error = -ESTALE;
2134 goto error_splat_super;
2135 }
f7b422b1 2136
54ceac45
DH		 2137 s->s_flags |= MS_ACTIVE;
2138 mnt->mnt_sb = s;
2139 mnt->mnt_root = mntroot;
f7b422b1 2140
f9c3a380
EP		 2141 /* clone any lsm security options from the parent to the new sb */
2142 security_sb_clone_mnt_opts(data->sb, s);
2143
54ceac45
DH		 2144 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2145 return 0;
24c8dbbb 2146
54ceac45
DH		 2147out_err_nosb:
2148 nfs_free_server(server);
2149out_err_noserver:
2150 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2151 return error;
f7b422b1 2152
54ceac45
DH		 2153error_splat_super:
2154 up_write(&s->s_umount);
2155 deactivate_super(s);
2156 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2157 return error;
f7b422b1
DH		 2158}
2159
54ceac45
DH		 2160#ifdef CONFIG_NFS_V4
2161
f7b422b1 2162/*
54ceac45 2163 * Finish setting up a cloned NFS4 superblock
f7b422b1 2164 */
54ceac45
DH		 2165static void nfs4_clone_super(struct super_block *sb,
2166 const struct super_block *old_sb)
f7b422b1 2167{
54ceac45
DH		 2168 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2169 sb->s_blocksize = old_sb->s_blocksize;
2170 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2171 sb->s_time_gran = 1;
54ceac45
DH		 2172 sb->s_op = old_sb->s_op;
2173 nfs_initialise_sb(sb);
f7b422b1
DH		 2174}
2175
54ceac45
DH		 2176/*
2177 * Set up an NFS4 superblock
2178 */
2179static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2180{
54ceac45
DH		 2181 sb->s_time_gran = 1;
2182 sb->s_op = &nfs4_sops;
2183 nfs_initialise_sb(sb);
f7b422b1
DH		 2184}
2185
f0768ebd
CL		 2186/*
2187 * Validate NFSv4 mount options
2188 */
91ea40b9
TT		 2189static int nfs4_validate_mount_data(void *options,
2190 struct nfs_parsed_mount_data *args,
2191 const char *dev_name)
f0768ebd 2192{
4c568017 2193 struct sockaddr_in *ap;
91ea40b9 2194 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2195 char *c;
2196
2197 if (data == NULL)
2198 goto out_no_data;
2199
91ea40b9
TT		 2200 args->rsize = NFS_MAX_FILE_IO_SIZE;
2201 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2202 args->acregmin = NFS_DEF_ACREGMIN;
2203 args->acregmax = NFS_DEF_ACREGMAX;
2204 args->acdirmin = NFS_DEF_ACDIRMIN;
2205 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 2206 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
6738b251
CL		 2207 args->auth_flavors[0] = RPC_AUTH_UNIX;
2208 args->auth_flavor_len = 0;
91ea40b9 2209
f0768ebd
CL		 2210 switch (data->version) {
2211 case 1:
4c568017
CL		 2212 ap = (struct sockaddr_in *)&args->nfs_server.address;
2213 if (data->host_addrlen > sizeof(args->nfs_server.address))
2214 goto out_no_address;
2215 if (data->host_addrlen == 0)
f0768ebd 2216 goto out_no_address;
4c568017
CL		 2217 args->nfs_server.addrlen = data->host_addrlen;
2218 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
f0768ebd 2219 return -EFAULT;
91ea40b9
TT		 2220 if (!nfs_verify_server_address((struct sockaddr *)
2221 &args->nfs_server.address))
f0768ebd
CL		 2222 goto out_no_address;
2223
6738b251
CL		 2224 if (data->auth_flavourlen) {
2225 if (data->auth_flavourlen > 1)
2226 goto out_inval_auth;
20c71f5e 2227 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2228 data->auth_flavours,
20c71f5e 2229 sizeof(args->auth_flavors[0])))
f0768ebd 2230 return -EFAULT;
f0768ebd
CL		 2231 }
2232
2233 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2234 if (IS_ERR(c))
2235 return PTR_ERR(c);
91ea40b9 2236 args->nfs_server.hostname = c;
f0768ebd
CL		 2237
2238 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2239 if (IS_ERR(c))
2240 return PTR_ERR(c);
91ea40b9
TT		 2241 args->nfs_server.export_path = c;
2242 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2243
2244 c = strndup_user(data->client_addr.data, 16);
2245 if (IS_ERR(c))
2246 return PTR_ERR(c);
91ea40b9
TT		 2247 args->client_address = c;
2248
2249 /*
2250 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2251 * can deal with.
2252 */
2253
2254 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2255 args->rsize = data->rsize;
2256 args->wsize = data->wsize;
2257 args->timeo = data->timeo;
2258 args->retrans = data->retrans;
2259 args->acregmin = data->acregmin;
2260 args->acregmax = data->acregmax;
2261 args->acdirmin = data->acdirmin;
2262 args->acdirmax = data->acdirmax;
2263 args->nfs_server.protocol = data->proto;
259875ef 2264 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2265
2266 break;
80071225 2267 default: {
dc045898 2268 int status;
91ea40b9
TT		 2269
2270 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2271 return -EINVAL;
2272
2273 if (!nfs_verify_server_address((struct sockaddr *)
91ea40b9 2274 &args->nfs_server.address))
80071225 2275 return -EINVAL;
80071225 2276
ed596a8a
CL		 2277 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2278 args->nfs_server.port);
2279
259875ef
TM		 2280 nfs_validate_transport_protocol(args);
2281
6738b251 2282 if (args->auth_flavor_len > 1)
80071225 2283 goto out_inval_auth;
80071225 2284
91ea40b9 2285 if (args->client_address == NULL)
0a87cf12
JL		 2286 goto out_no_client_address;
2287
dc045898
CL		 2288 status = nfs_parse_devname(dev_name,
2289 &args->nfs_server.hostname,
2290 NFS4_MAXNAMLEN,
2291 &args->nfs_server.export_path,
2292 NFS4_MAXPATHLEN);
2293 if (status < 0)
2294 return status;
2295
80071225
CL		 2296 break;
2297 }
f0768ebd
CL		 2298 }
2299
2300 return 0;
2301
2302out_no_data:
2303 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2304 return -EINVAL;
2305
2306out_inval_auth:
2307 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2308 data->auth_flavourlen);
2309 return -EINVAL;
2310
2311out_no_address:
2312 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2313 return -EINVAL;
0a87cf12
JL		 2314
2315out_no_client_address:
2316 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2317 return -EINVAL;
f0768ebd
CL		 2318}
2319
54ceac45
DH		 2320/*
2321 * Get the superblock for an NFS4 mountpoint
2322 */
816724e6
TM		 2323static int nfs4_get_sb(struct file_system_type *fs_type,
2324 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2325{
33852a1f 2326 struct nfs_parsed_mount_data *data;
54ceac45
DH		 2327 struct super_block *s;
2328 struct nfs_server *server;
33852a1f 2329 struct nfs_fh *mntfh;
54ceac45 2330 struct dentry *mntroot;
75180df2 2331 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2332 struct nfs_sb_mountdata sb_mntdata = {
2333 .mntflags = flags,
2334 };
33852a1f
TM		 2335 int error = -ENOMEM;
2336
2337 data = kzalloc(sizeof(*data), GFP_KERNEL);
2338 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2339 if (data == NULL || mntfh == NULL)
2340 goto out_free_fh;
f7b422b1 2341
33852a1f 2342 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2343
f0768ebd 2344 /* Validate the mount data */
33852a1f 2345 error = nfs4_validate_mount_data(raw_data, data, dev_name);
f0768ebd
CL		 2346 if (error < 0)
2347 goto out;
f7b422b1 2348
54ceac45 2349 /* Get a volume representation */
33852a1f 2350 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2351 if (IS_ERR(server)) {
2352 error = PTR_ERR(server);
29eb981a 2353 goto out;
f7b422b1 2354 }
e89a5a43 2355 sb_mntdata.server = server;
f7b422b1 2356
75180df2
TM		 2357 if (server->flags & NFS4_MOUNT_UNSHARED)
2358 compare_super = NULL;
2359
54ceac45 2360 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2361 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2362 if (IS_ERR(s)) {
2363 error = PTR_ERR(s);
f7b422b1 2364 goto out_free;
816724e6
TM		 2365 }
2366
5dd3177a
TM		 2367 if (s->s_fs_info != server) {
2368 nfs_free_server(server);
2369 server = NULL;
fa799759
MS		 2370 } else {
2371 error = nfs_bdi_register(server);
2372 if (error)
2373 goto error_splat_super;
5dd3177a
TM		 2374 }
2375
54ceac45
DH		 2376 if (!s->s_root) {
2377 /* initial superblock/root creation */
54ceac45 2378 nfs4_fill_super(s);
54ceac45 2379 }
f7b422b1 2380
33852a1f 2381 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2382 if (IS_ERR(mntroot)) {
2383 error = PTR_ERR(mntroot);
2384 goto error_splat_super;
f7b422b1 2385 }
54ceac45 2386
33852a1f 2387 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2388 if (error)
2389 goto error_splat_root;
2390
f7b422b1 2391 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2392 mnt->mnt_sb = s;
2393 mnt->mnt_root = mntroot;
29eb981a
CL		 2394 error = 0;
2395
2396out:
33852a1f
TM		 2397 kfree(data->client_address);
2398 kfree(data->nfs_server.export_path);
2399 kfree(data->nfs_server.hostname);
2400 security_free_mnt_opts(&data->lsm_opts);
2401out_free_fh:
2402 kfree(mntfh);
2403 kfree(data);
29eb981a 2404 return error;
54ceac45 2405
f7b422b1 2406out_free:
54ceac45 2407 nfs_free_server(server);
29eb981a 2408 goto out;
54ceac45 2409
46c8ac74
EP		 2410error_splat_root:
2411 dput(mntroot);
54ceac45
DH		 2412error_splat_super:
2413 up_write(&s->s_umount);
2414 deactivate_super(s);
29eb981a 2415 goto out;
f7b422b1
DH		 2416}
2417
2418static void nfs4_kill_super(struct super_block *sb)
2419{
2420 struct nfs_server *server = NFS_SB(sb);
2421
2422 nfs_return_all_delegations(sb);
2423 kill_anon_super(sb);
2424
2425 nfs4_renewd_prepare_shutdown(server);
54ceac45 2426 nfs_free_server(server);
f7b422b1
DH		 2427}
2428
2429/*
54ceac45 2430 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2431 */
54ceac45
DH		 2432static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2433 const char *dev_name, void *raw_data,
2434 struct vfsmount *mnt)
f7b422b1 2435{
54ceac45
DH		 2436 struct nfs_clone_mount *data = raw_data;
2437 struct super_block *s;
2438 struct nfs_server *server;
2439 struct dentry *mntroot;
75180df2 2440 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2441 struct nfs_sb_mountdata sb_mntdata = {
2442 .mntflags = flags,
2443 };
54ceac45 2444 int error;
f7b422b1 2445
54ceac45 2446 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2447
54ceac45
DH		 2448 /* create a new volume representation */
2449 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2450 if (IS_ERR(server)) {
2451 error = PTR_ERR(server);
2452 goto out_err_noserver;
f7b422b1 2453 }
e89a5a43 2454 sb_mntdata.server = server;
f7b422b1 2455
75180df2
TM		 2456 if (server->flags & NFS4_MOUNT_UNSHARED)
2457 compare_super = NULL;
2458
54ceac45 2459 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2460 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2461 if (IS_ERR(s)) {
2462 error = PTR_ERR(s);
2463 goto out_err_nosb;
f7b422b1 2464 }
f7b422b1 2465
54ceac45
DH		 2466 if (s->s_fs_info != server) {
2467 nfs_free_server(server);
2468 server = NULL;
fa799759
MS		 2469 } else {
2470 error = nfs_bdi_register(server);
2471 if (error)
2472 goto error_splat_super;
54ceac45 2473 }
f7b422b1 2474
54ceac45
DH		 2475 if (!s->s_root) {
2476 /* initial superblock/root creation */
54ceac45
DH		 2477 nfs4_clone_super(s, data->sb);
2478 }
f7b422b1 2479
54ceac45
DH		 2480 mntroot = nfs4_get_root(s, data->fh);
2481 if (IS_ERR(mntroot)) {
2482 error = PTR_ERR(mntroot);
2483 goto error_splat_super;
2484 }
e9cc6c23
TM		 2485 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2486 dput(mntroot);
2487 error = -ESTALE;
2488 goto error_splat_super;
2489 }
f7b422b1 2490
54ceac45
DH		 2491 s->s_flags |= MS_ACTIVE;
2492 mnt->mnt_sb = s;
2493 mnt->mnt_root = mntroot;
2494
46c8ac74
EP		 2495 security_sb_clone_mnt_opts(data->sb, s);
2496
54ceac45
DH		 2497 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2498 return 0;
2499
2500out_err_nosb:
2501 nfs_free_server(server);
2502out_err_noserver:
2503 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2504 return error;
2505
2506error_splat_super:
2507 up_write(&s->s_umount);
2508 deactivate_super(s);
2509 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2510 return error;
f7b422b1
DH		 2511}
2512
54ceac45
DH		 2513/*
2514 * Create an NFS4 server record on referral traversal
2515 */
2516static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2517 const char *dev_name, void *raw_data,
2518 struct vfsmount *mnt)
f7b422b1
DH		 2519{
2520 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2521 struct super_block *s;
2522 struct nfs_server *server;
2523 struct dentry *mntroot;
2524 struct nfs_fh mntfh;
75180df2 2525 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2526 struct nfs_sb_mountdata sb_mntdata = {
2527 .mntflags = flags,
2528 };
54ceac45
DH		 2529 int error;
2530
2531 dprintk("--> nfs4_referral_get_sb()\n");
2532
2533 /* create a new volume representation */
2534 server = nfs4_create_referral_server(data, &mntfh);
2535 if (IS_ERR(server)) {
2536 error = PTR_ERR(server);
2537 goto out_err_noserver;
2538 }
e89a5a43 2539 sb_mntdata.server = server;
54ceac45 2540
75180df2
TM		 2541 if (server->flags & NFS4_MOUNT_UNSHARED)
2542 compare_super = NULL;
2543
54ceac45 2544 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2545 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2546 if (IS_ERR(s)) {
2547 error = PTR_ERR(s);
2548 goto out_err_nosb;
2549 }
2550
2551 if (s->s_fs_info != server) {
2552 nfs_free_server(server);
2553 server = NULL;
fa799759
MS		 2554 } else {
2555 error = nfs_bdi_register(server);
2556 if (error)
2557 goto error_splat_super;
54ceac45
DH		 2558 }
2559
2560 if (!s->s_root) {
2561 /* initial superblock/root creation */
54ceac45
DH		 2562 nfs4_fill_super(s);
2563 }
2564
f2d0d85e 2565 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2566 if (IS_ERR(mntroot)) {
2567 error = PTR_ERR(mntroot);
2568 goto error_splat_super;
2569 }
e9cc6c23
TM		 2570 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2571 dput(mntroot);
2572 error = -ESTALE;
2573 goto error_splat_super;
2574 }
54ceac45
DH		 2575
2576 s->s_flags |= MS_ACTIVE;
2577 mnt->mnt_sb = s;
2578 mnt->mnt_root = mntroot;
2579
46c8ac74
EP		 2580 security_sb_clone_mnt_opts(data->sb, s);
2581
54ceac45
DH		 2582 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2583 return 0;
2584
2585out_err_nosb:
2586 nfs_free_server(server);
2587out_err_noserver:
2588 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2589 return error;
2590
2591error_splat_super:
2592 up_write(&s->s_umount);
2593 deactivate_super(s);
2594 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2595 return error;
f7b422b1
DH		 2596}
2597
54ceac45 2598#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)