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Merge branch 'fix/asoc' into for-linus
[mirror_ubuntu-zesty-kernel.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf
TM		 44#include <linux/mnt_namespace.h>
45#include <linux/namei.h>
f7b422b1
DH		 46#include <linux/nfs_idmap.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
fd00a8ff 49#include <linux/in6.h>
5a0e3ad6 50#include <linux/slab.h>
fd00a8ff 51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.h>
f7b422b1
DH		 56
57#include <asm/system.h>
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
f7b422b1
DH		 66
67#define NFSDBG_FACILITY NFSDBG_VFS
68
1e657bd5
PZ		 69#ifdef CONFIG_NFS_V3
70#define NFS_DEFAULT_VERSION 3
71#else
72#define NFS_DEFAULT_VERSION 2
73#endif
74
bf0fd768
CL		 75enum {
76 /* Mount options that take no arguments */
77 Opt_soft, Opt_hard,
bf0fd768
CL		 78 Opt_posix, Opt_noposix,
79 Opt_cto, Opt_nocto,
80 Opt_ac, Opt_noac,
81 Opt_lock, Opt_nolock,
764302cc 82 Opt_v2, Opt_v3, Opt_v4,
2cf7ff7a 83 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 84 Opt_acl, Opt_noacl,
85 Opt_rdirplus, Opt_nordirplus,
75180df2 86 Opt_sharecache, Opt_nosharecache,
d740351b 87 Opt_resvport, Opt_noresvport,
b797cac7 88 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 89
90 /* Mount options that take integer arguments */
91 Opt_port,
92 Opt_rsize, Opt_wsize, Opt_bsize,
93 Opt_timeo, Opt_retrans,
94 Opt_acregmin, Opt_acregmax,
95 Opt_acdirmin, Opt_acdirmax,
96 Opt_actimeo,
97 Opt_namelen,
98 Opt_mountport,
e887cbcf 99 Opt_mountvers,
ad879cef 100 Opt_nfsvers,
3fd5be9e 101 Opt_minorversion,
bf0fd768
CL		 102
103 /* Mount options that take string arguments */
33832034 104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 105 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 106 Opt_lookupcache,
b797cac7 107 Opt_fscache_uniq,
5eebde23 108 Opt_local_lock,
bf0fd768 109
f45663ce
CL		 110 /* Special mount options */
111 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 112
113 Opt_err
114};
115
a447c093 116static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 117 { Opt_userspace, "bg" },
118 { Opt_userspace, "fg" },
ecbb3845
CL		 119 { Opt_userspace, "retry=%s" },
120
f45663ce
CL		 121 { Opt_sloppy, "sloppy" },
122
bf0fd768
CL		 123 { Opt_soft, "soft" },
124 { Opt_hard, "hard" },
d33e4dfe
CL		 125 { Opt_deprecated, "intr" },
126 { Opt_deprecated, "nointr" },
bf0fd768
CL		 127 { Opt_posix, "posix" },
128 { Opt_noposix, "noposix" },
129 { Opt_cto, "cto" },
130 { Opt_nocto, "nocto" },
131 { Opt_ac, "ac" },
132 { Opt_noac, "noac" },
133 { Opt_lock, "lock" },
134 { Opt_nolock, "nolock" },
135 { Opt_v2, "v2" },
136 { Opt_v3, "v3" },
764302cc 137 { Opt_v4, "v4" },
bf0fd768
CL		 138 { Opt_udp, "udp" },
139 { Opt_tcp, "tcp" },
2cf7ff7a 140 { Opt_rdma, "rdma" },
bf0fd768
CL		 141 { Opt_acl, "acl" },
142 { Opt_noacl, "noacl" },
143 { Opt_rdirplus, "rdirplus" },
144 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 145 { Opt_sharecache, "sharecache" },
146 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 147 { Opt_resvport, "resvport" },
148 { Opt_noresvport, "noresvport" },
b797cac7 149 { Opt_fscache, "fsc" },
b797cac7 150 { Opt_nofscache, "nofsc" },
bf0fd768 151
a5a16bae
CL		 152 { Opt_port, "port=%s" },
153 { Opt_rsize, "rsize=%s" },
154 { Opt_wsize, "wsize=%s" },
155 { Opt_bsize, "bsize=%s" },
156 { Opt_timeo, "timeo=%s" },
157 { Opt_retrans, "retrans=%s" },
158 { Opt_acregmin, "acregmin=%s" },
159 { Opt_acregmax, "acregmax=%s" },
160 { Opt_acdirmin, "acdirmin=%s" },
161 { Opt_acdirmax, "acdirmax=%s" },
162 { Opt_actimeo, "actimeo=%s" },
163 { Opt_namelen, "namlen=%s" },
164 { Opt_mountport, "mountport=%s" },
165 { Opt_mountvers, "mountvers=%s" },
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 168 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
33832034 175 { Opt_mounthost, "mounthost=%s" },
0ac83779 176 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 177
7973c1f1 178 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 179 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 180 { Opt_local_lock, "local_lock=%s" },
7973c1f1 181
bf0fd768
CL		 182 { Opt_err, NULL }
183};
184
185enum {
ee671b01 186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 187
188 Opt_xprt_err
189};
190
a447c093 191static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 192 { Opt_xprt_udp, "udp" },
ee671b01 193 { Opt_xprt_udp6, "udp6" },
bf0fd768 194 { Opt_xprt_tcp, "tcp" },
ee671b01 195 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 196 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 197
198 { Opt_xprt_err, NULL }
199};
200
201enum {
202 Opt_sec_none, Opt_sec_sys,
203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
206
207 Opt_sec_err
208};
209
a447c093 210static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 211 { Opt_sec_none, "none" },
212 { Opt_sec_none, "null" },
213 { Opt_sec_sys, "sys" },
214
215 { Opt_sec_krb5, "krb5" },
216 { Opt_sec_krb5i, "krb5i" },
217 { Opt_sec_krb5p, "krb5p" },
218
219 { Opt_sec_lkey, "lkey" },
220 { Opt_sec_lkeyi, "lkeyi" },
221 { Opt_sec_lkeyp, "lkeyp" },
222
8d042218
OK		 223 { Opt_sec_spkm, "spkm3" },
224 { Opt_sec_spkmi, "spkm3i" },
225 { Opt_sec_spkmp, "spkm3p" },
226
bf0fd768
CL		 227 { Opt_sec_err, NULL }
228};
229
7973c1f1
TM		 230enum {
231 Opt_lookupcache_all, Opt_lookupcache_positive,
232 Opt_lookupcache_none,
233
234 Opt_lookupcache_err
235};
236
237static match_table_t nfs_lookupcache_tokens = {
238 { Opt_lookupcache_all, "all" },
239 { Opt_lookupcache_positive, "pos" },
240 { Opt_lookupcache_positive, "positive" },
241 { Opt_lookupcache_none, "none" },
242
243 { Opt_lookupcache_err, NULL }
244};
245
5eebde23
SJ		 246enum {
247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
248 Opt_local_lock_none,
249
250 Opt_local_lock_err
251};
252
253static match_table_t nfs_local_lock_tokens = {
254 { Opt_local_lock_all, "all" },
255 { Opt_local_lock_flock, "flock" },
256 { Opt_local_lock_posix, "posix" },
257 { Opt_local_lock_none, "none" },
258
259 { Opt_local_lock_err, NULL }
260};
261
bf0fd768 262
42faad99 263static void nfs_umount_begin(struct super_block *);
816724e6 264static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 265static int nfs_show_options(struct seq_file *, struct vfsmount *);
266static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 267static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
31f43471
AV		 268static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
269 int flags, const char *dev_name, void *raw_data);
387c149b 270static void nfs_put_super(struct super_block *);
f7b422b1 271static void nfs_kill_super(struct super_block *);
48b605f8 272static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 273
274static struct file_system_type nfs_fs_type = {
275 .owner = THIS_MODULE,
276 .name = "nfs",
277 .get_sb = nfs_get_sb,
278 .kill_sb = nfs_kill_super,
349457cc 279 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 280};
281
54ceac45 282struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 283 .owner = THIS_MODULE,
284 .name = "nfs",
31f43471 285 .mount = nfs_xdev_mount,
f7b422b1 286 .kill_sb = nfs_kill_super,
349457cc 287 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 288};
289
ee9b6d61 290static const struct super_operations nfs_sops = {
f7b422b1
DH		 291 .alloc_inode = nfs_alloc_inode,
292 .destroy_inode = nfs_destroy_inode,
293 .write_inode = nfs_write_inode,
387c149b 294 .put_super = nfs_put_super,
f7b422b1 295 .statfs = nfs_statfs,
b57922d9 296 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 297 .umount_begin = nfs_umount_begin,
298 .show_options = nfs_show_options,
299 .show_stats = nfs_show_stats,
48b605f8 300 .remount_fs = nfs_remount,
f7b422b1
DH		 301};
302
303#ifdef CONFIG_NFS_V4
7630c852
CL		 304static int nfs4_validate_text_mount_data(void *options,
305 struct nfs_parsed_mount_data *args, const char *dev_name);
a6fe23be
CL		 306static int nfs4_try_mount(int flags, const char *dev_name,
307 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
816724e6
TM		 308static int nfs4_get_sb(struct file_system_type *fs_type,
309 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
31f43471
AV		 310static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
311 int flags, const char *dev_name, void *raw_data);
312static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
313 int flags, const char *dev_name, void *raw_data);
54ceac45
DH		 314static int nfs4_referral_get_sb(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
31f43471
AV		 316static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 318static void nfs4_kill_super(struct super_block *sb);
319
320static struct file_system_type nfs4_fs_type = {
321 .owner = THIS_MODULE,
322 .name = "nfs4",
323 .get_sb = nfs4_get_sb,
324 .kill_sb = nfs4_kill_super,
349457cc 325 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 326};
327
c02d7adf
TM		 328static struct file_system_type nfs4_remote_fs_type = {
329 .owner = THIS_MODULE,
330 .name = "nfs4",
31f43471 331 .mount = nfs4_remote_mount,
c02d7adf
TM		 332 .kill_sb = nfs4_kill_super,
333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
334};
335
54ceac45 336struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 337 .owner = THIS_MODULE,
338 .name = "nfs4",
31f43471 339 .mount = nfs4_xdev_mount,
f7b422b1 340 .kill_sb = nfs4_kill_super,
349457cc 341 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 342};
343
c02d7adf
TM		 344static struct file_system_type nfs4_remote_referral_fs_type = {
345 .owner = THIS_MODULE,
346 .name = "nfs4",
31f43471 347 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 348 .kill_sb = nfs4_kill_super,
349 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
350};
351
54ceac45 352struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 353 .owner = THIS_MODULE,
354 .name = "nfs4",
54ceac45 355 .get_sb = nfs4_referral_get_sb,
f7b422b1 356 .kill_sb = nfs4_kill_super,
349457cc 357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 358};
359
ee9b6d61 360static const struct super_operations nfs4_sops = {
f7b422b1
DH		 361 .alloc_inode = nfs_alloc_inode,
362 .destroy_inode = nfs_destroy_inode,
363 .write_inode = nfs_write_inode,
387c149b 364 .put_super = nfs_put_super,
f7b422b1 365 .statfs = nfs_statfs,
b57922d9 366 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 367 .umount_begin = nfs_umount_begin,
368 .show_options = nfs_show_options,
369 .show_stats = nfs_show_stats,
48b605f8 370 .remount_fs = nfs_remount,
f7b422b1
DH		 371};
372#endif
373
8e1f936b
RR		 374static struct shrinker acl_shrinker = {
375 .shrink = nfs_access_cache_shrinker,
376 .seeks = DEFAULT_SEEKS,
377};
979df72e 378
f7b422b1
DH		 379/*
380 * Register the NFS filesystems
381 */
382int __init register_nfs_fs(void)
383{
384 int ret;
385
386 ret = register_filesystem(&nfs_fs_type);
387 if (ret < 0)
388 goto error_0;
389
f7b422b1
DH		 390 ret = nfs_register_sysctl();
391 if (ret < 0)
392 goto error_1;
89a09141 393#ifdef CONFIG_NFS_V4
f7b422b1
DH		 394 ret = register_filesystem(&nfs4_fs_type);
395 if (ret < 0)
396 goto error_2;
397#endif
8e1f936b 398 register_shrinker(&acl_shrinker);
f7b422b1
DH		 399 return 0;
400
401#ifdef CONFIG_NFS_V4
402error_2:
403 nfs_unregister_sysctl();
89a09141 404#endif
f7b422b1
DH		 405error_1:
406 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 407error_0:
408 return ret;
409}
410
411/*
412 * Unregister the NFS filesystems
413 */
414void __exit unregister_nfs_fs(void)
415{
8e1f936b 416 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 417#ifdef CONFIG_NFS_V4
418 unregister_filesystem(&nfs4_fs_type);
f7b422b1 419#endif
49af7ee1 420 nfs_unregister_sysctl();
f7b422b1
DH		 421 unregister_filesystem(&nfs_fs_type);
422}
423
1daef0a8 424void nfs_sb_active(struct super_block *sb)
ef818a28 425{
1daef0a8 426 struct nfs_server *server = NFS_SB(sb);
ef818a28 427
1daef0a8
TM		 428 if (atomic_inc_return(&server->active) == 1)
429 atomic_inc(&sb->s_active);
ef818a28
SD		 430}
431
1daef0a8 432void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 433{
434 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 435
436 if (atomic_dec_and_test(&server->active))
437 deactivate_super(sb);
ef818a28
SD		 438}
439
f7b422b1
DH		 440/*
441 * Deliver file system statistics to userspace
442 */
816724e6 443static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 444{
0c7d90cf 445 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 446 unsigned char blockbits;
447 unsigned long blockres;
0c7d90cf 448 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 449 struct nfs_fsstat res;
450 int error = -ENOMEM;
451
452 res.fattr = nfs_alloc_fattr();
453 if (res.fattr == NULL)
454 goto out_err;
f7b422b1 455
8fa5c000 456 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 457 if (unlikely(error == -ESTALE)) {
458 struct dentry *pd_dentry;
459
460 pd_dentry = dget_parent(dentry);
461 if (pd_dentry != NULL) {
462 nfs_zap_caches(pd_dentry->d_inode);
463 dput(pd_dentry);
464 }
465 }
ca7e9a0d 466 nfs_free_fattr(res.fattr);
f7b422b1
DH		 467 if (error < 0)
468 goto out_err;
ca7e9a0d 469
1a0ba9ae 470 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 471
472 /*
473 * Current versions of glibc do not correctly handle the
474 * case where f_frsize != f_bsize. Eventually we want to
475 * report the value of wtmult in this field.
476 */
0c7d90cf 477 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 478
479 /*
480 * On most *nix systems, f_blocks, f_bfree, and f_bavail
481 * are reported in units of f_frsize. Linux hasn't had
482 * an f_frsize field in its statfs struct until recently,
483 * thus historically Linux's sys_statfs reports these
484 * fields in units of f_bsize.
485 */
0c7d90cf
DH		 486 buf->f_bsize = dentry->d_sb->s_blocksize;
487 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 488 blockres = (1 << blockbits) - 1;
489 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
490 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
491 buf->f_bavail = (res.abytes + blockres) >> blockbits;
492
493 buf->f_files = res.tfiles;
494 buf->f_ffree = res.afiles;
495
496 buf->f_namelen = server->namelen;
1a0ba9ae 497
f7b422b1
DH		 498 return 0;
499
500 out_err:
3110ff80 501 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 502 return error;
f7b422b1
DH		 503}
504
7d4e2747
DH		 505/*
506 * Map the security flavour number to a name
507 */
81039f1f
TM		 508static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
509{
7d4e2747 510 static const struct {
81039f1f
TM		 511 rpc_authflavor_t flavour;
512 const char *str;
513 } sec_flavours[] = {
514 { RPC_AUTH_NULL, "null" },
515 { RPC_AUTH_UNIX, "sys" },
516 { RPC_AUTH_GSS_KRB5, "krb5" },
517 { RPC_AUTH_GSS_KRB5I, "krb5i" },
518 { RPC_AUTH_GSS_KRB5P, "krb5p" },
519 { RPC_AUTH_GSS_LKEY, "lkey" },
520 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
521 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
522 { RPC_AUTH_GSS_SPKM, "spkm" },
523 { RPC_AUTH_GSS_SPKMI, "spkmi" },
524 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 525 { UINT_MAX, "unknown" }
81039f1f
TM		 526 };
527 int i;
528
4d81cd16 529 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 530 if (sec_flavours[i].flavour == flavour)
531 break;
532 }
533 return sec_flavours[i].str;
534}
535
ee671b01
JL		 536static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
537 int showdefaults)
538{
539 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
540
541 seq_printf(m, ",mountproto=");
542 switch (sap->sa_family) {
543 case AF_INET:
544 switch (nfss->mountd_protocol) {
545 case IPPROTO_UDP:
546 seq_printf(m, RPCBIND_NETID_UDP);
547 break;
548 case IPPROTO_TCP:
549 seq_printf(m, RPCBIND_NETID_TCP);
550 break;
551 default:
552 if (showdefaults)
553 seq_printf(m, "auto");
554 }
555 break;
556 case AF_INET6:
557 switch (nfss->mountd_protocol) {
558 case IPPROTO_UDP:
559 seq_printf(m, RPCBIND_NETID_UDP6);
560 break;
561 case IPPROTO_TCP:
562 seq_printf(m, RPCBIND_NETID_TCP6);
563 break;
564 default:
565 if (showdefaults)
566 seq_printf(m, "auto");
567 }
568 break;
569 default:
570 if (showdefaults)
571 seq_printf(m, "auto");
572 }
573}
574
82d101d5
CL		 575static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
576 int showdefaults)
577{
578 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
579
d5eff1a3
BS		 580 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
581 return;
582
82d101d5
CL		 583 switch (sap->sa_family) {
584 case AF_INET: {
585 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 586 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 587 break;
588 }
589 case AF_INET6: {
590 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 591 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 592 break;
593 }
594 default:
595 if (showdefaults)
596 seq_printf(m, ",mountaddr=unspecified");
597 }
598
599 if (nfss->mountd_version || showdefaults)
600 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
601 if (nfss->mountd_port || showdefaults)
602 seq_printf(m, ",mountport=%u", nfss->mountd_port);
603
ee671b01 604 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 605}
606
0be8189f
TM		 607#ifdef CONFIG_NFS_V4
608static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
609 int showdefaults)
610{
611 struct nfs_client *clp = nfss->nfs_client;
612
613 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
614 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
615}
616#else
617static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
618 int showdefaults)
619{
620}
621#endif
622
f7b422b1
DH		 623/*
624 * Describe the mount options in force on this server representation
625 */
82d101d5
CL		 626static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
627 int showdefaults)
f7b422b1 628{
509de811 629 static const struct proc_nfs_info {
f7b422b1 630 int flag;
509de811
DH		 631 const char *str;
632 const char *nostr;
f7b422b1
DH		 633 } nfs_info[] = {
634 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 635 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 636 { NFS_MOUNT_NOCTO, ",nocto", "" },
637 { NFS_MOUNT_NOAC, ",noac", "" },
638 { NFS_MOUNT_NONLM, ",nolock", "" },
639 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 640 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 641 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
642 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 643 { 0, NULL, NULL }
644 };
509de811 645 const struct proc_nfs_info *nfs_infop;
8fa5c000 646 struct nfs_client *clp = nfss->nfs_client;
82d101d5 647 u32 version = clp->rpc_ops->version;
7c563cc9 648 int local_flock, local_fcntl;
f7b422b1 649
82d101d5 650 seq_printf(m, ",vers=%u", version);
2d767432
CL		 651 seq_printf(m, ",rsize=%u", nfss->rsize);
652 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 653 if (nfss->bsize != 0)
654 seq_printf(m, ",bsize=%u", nfss->bsize);
655 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 656 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 657 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 658 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 659 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 660 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 661 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 662 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 663 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 664 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
665 if (nfss->flags & nfs_infop->flag)
666 seq_puts(m, nfs_infop->str);
667 else
668 seq_puts(m, nfs_infop->nostr);
669 }
56928edd 670 seq_printf(m, ",proto=%s",
ee671b01 671 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 672 if (version == 4) {
673 if (nfss->port != NFS_PORT)
674 seq_printf(m, ",port=%u", nfss->port);
675 } else
676 if (nfss->port)
677 seq_printf(m, ",port=%u", nfss->port);
678
33170233
TM		 679 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
680 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 681 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 682
683 if (version != 4)
684 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 685 else
686 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 687
b797cac7
DH		 688 if (nfss->options & NFS_OPTION_FSCACHE)
689 seq_printf(m, ",fsc");
9b00c643
PL		 690
691 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
692 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
693 seq_printf(m, ",lookupcache=none");
694 else
695 seq_printf(m, ",lookupcache=pos");
696 }
7c563cc9
SJ		 697
698 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
699 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
700
701 if (!local_flock && !local_fcntl)
702 seq_printf(m, ",local_lock=none");
703 else if (local_flock && local_fcntl)
704 seq_printf(m, ",local_lock=all");
705 else if (local_flock)
706 seq_printf(m, ",local_lock=flock");
707 else
708 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 709}
710
711/*
712 * Describe the mount options on this VFS mountpoint
713 */
714static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
715{
716 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
717
718 nfs_show_mount_options(m, nfss, 0);
719
5d8515ca
CL		 720 seq_printf(m, ",addr=%s",
721 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
722 RPC_DISPLAY_ADDR));
f7b422b1
DH		 723
724 return 0;
725}
726
727/*
728 * Present statistical information for this VFS mountpoint
729 */
730static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
731{
732 int i, cpu;
733 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
734 struct rpc_auth *auth = nfss->client->cl_auth;
735 struct nfs_iostats totals = { };
736
737 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
738
739 /*
740 * Display all mount option settings
741 */
742 seq_printf(m, "\n\topts:\t");
743 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
744 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
745 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
746 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
747 nfs_show_mount_options(m, nfss, 1);
748
749 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
750
751 seq_printf(m, "\n\tcaps:\t");
752 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 753 seq_printf(m, ",wtmult=%u", nfss->wtmult);
754 seq_printf(m, ",dtsize=%u", nfss->dtsize);
755 seq_printf(m, ",bsize=%u", nfss->bsize);
756 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 757
758#ifdef CONFIG_NFS_V4
40c55319 759 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 760 seq_printf(m, "\n\tnfsv4:\t");
761 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
762 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
763 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
764 }
765#endif
766
767 /*
768 * Display security flavor in effect for this mount
769 */
2d767432 770 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 771 if (auth->au_flavor)
2d767432 772 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 773
774 /*
775 * Display superblock I/O counters
776 */
777 for_each_possible_cpu(cpu) {
778 struct nfs_iostats *stats;
779
780 preempt_disable();
781 stats = per_cpu_ptr(nfss->io_stats, cpu);
782
783 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
784 totals.events[i] += stats->events[i];
785 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
786 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 787#ifdef CONFIG_NFS_FSCACHE
788 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
789 totals.fscache[i] += stats->fscache[i];
790#endif
f7b422b1
DH		 791
792 preempt_enable();
793 }
794
795 seq_printf(m, "\n\tevents:\t");
796 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
797 seq_printf(m, "%lu ", totals.events[i]);
798 seq_printf(m, "\n\tbytes:\t");
799 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
800 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 801#ifdef CONFIG_NFS_FSCACHE
802 if (nfss->options & NFS_OPTION_FSCACHE) {
803 seq_printf(m, "\n\tfsc:\t");
804 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
805 seq_printf(m, "%Lu ", totals.bytes[i]);
806 }
807#endif
f7b422b1
DH		 808 seq_printf(m, "\n");
809
810 rpc_print_iostats(m, nfss->client);
811
812 return 0;
813}
814
815/*
816 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 817 * in response to xdev traversals and referrals
f7b422b1 818 */
42faad99 819static void nfs_umount_begin(struct super_block *sb)
f7b422b1 820{
67e55205 821 struct nfs_server *server;
fc6ae3cf
TM		 822 struct rpc_clnt *rpc;
823
67e55205 824 server = NFS_SB(sb);
fc6ae3cf
TM		 825 /* -EIO all pending I/O */
826 rpc = server->client_acl;
827 if (!IS_ERR(rpc))
828 rpc_killall_tasks(rpc);
829 rpc = server->client;
830 if (!IS_ERR(rpc))
831 rpc_killall_tasks(rpc);
f7b422b1
DH		 832}
833
c5811dbd 834static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 835{
836 struct nfs_parsed_mount_data *data;
837
838 data = kzalloc(sizeof(*data), GFP_KERNEL);
839 if (data) {
9423a08a
CL		 840 data->acregmin = NFS_DEF_ACREGMIN;
841 data->acregmax = NFS_DEF_ACREGMAX;
842 data->acdirmin = NFS_DEF_ACDIRMIN;
843 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 844 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 845 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 846 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 847 data->auth_flavors[0] = RPC_AUTH_UNIX;
848 data->auth_flavor_len = 1;
c5811dbd 849 data->version = version;
9423a08a
CL		 850 data->minorversion = 0;
851 }
852 return data;
853}
854
fc50d58f 855/*
cdcd7f9a
CL		 856 * Sanity-check a server address provided by the mount command.
857 *
858 * Address family must be initialized, and address must not be
859 * the ANY address for that family.
fc50d58f
CL		 860 */
861static int nfs_verify_server_address(struct sockaddr *addr)
862{
863 switch (addr->sa_family) {
864 case AF_INET: {
cdcd7f9a 865 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 866 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 867 }
868 case AF_INET6: {
869 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
870 return !ipv6_addr_any(sa);
fc50d58f
CL		 871 }
872 }
873
53a0b9c4 874 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 875 return 0;
876}
877
4cfd74fc
CL		 878/*
879 * Select between a default port value and a user-specified port value.
880 * If a zero value is set, then autobind will be used.
881 */
f5855fec 882static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 883 const unsigned short default_port)
884{
f5855fec
TM		 885 if (*port == NFS_UNSPEC_PORT)
886 *port = default_port;
4cfd74fc 887
f5855fec 888 rpc_set_port(sap, *port);
4cfd74fc
CL		 889}
890
259875ef
TM		 891/*
892 * Sanity check the NFS transport protocol.
893 *
894 */
895static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
896{
897 switch (mnt->nfs_server.protocol) {
898 case XPRT_TRANSPORT_UDP:
899 case XPRT_TRANSPORT_TCP:
900 case XPRT_TRANSPORT_RDMA:
901 break;
902 default:
903 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
904 }
905}
906
907/*
908 * For text based NFSv2/v3 mounts, the mount protocol transport default
909 * settings should depend upon the specified NFS transport.
910 */
911static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
912{
913 nfs_validate_transport_protocol(mnt);
914
915 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
916 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
917 return;
918 switch (mnt->nfs_server.protocol) {
919 case XPRT_TRANSPORT_UDP:
920 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
921 break;
922 case XPRT_TRANSPORT_TCP:
923 case XPRT_TRANSPORT_RDMA:
924 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
925 }
926}
927
01060c89
CL		 928/*
929 * Parse the value of the 'sec=' option.
01060c89
CL		 930 */
931static int nfs_parse_security_flavors(char *value,
932 struct nfs_parsed_mount_data *mnt)
933{
934 substring_t args[MAX_OPT_ARGS];
935
936 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
937
938 switch (match_token(value, nfs_secflavor_tokens, args)) {
939 case Opt_sec_none:
01060c89
CL		 940 mnt->auth_flavors[0] = RPC_AUTH_NULL;
941 break;
942 case Opt_sec_sys:
01060c89
CL		 943 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
944 break;
945 case Opt_sec_krb5:
01060c89
CL		 946 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
947 break;
948 case Opt_sec_krb5i:
01060c89
CL		 949 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
950 break;
951 case Opt_sec_krb5p:
01060c89
CL		 952 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
953 break;
954 case Opt_sec_lkey:
01060c89
CL		 955 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
956 break;
957 case Opt_sec_lkeyi:
01060c89
CL		 958 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
959 break;
960 case Opt_sec_lkeyp:
01060c89
CL		 961 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
962 break;
963 case Opt_sec_spkm:
01060c89
CL		 964 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
965 break;
966 case Opt_sec_spkmi:
01060c89
CL		 967 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
968 break;
969 case Opt_sec_spkmp:
01060c89
CL		 970 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
971 break;
972 default:
973 return 0;
974 }
975
059f90b3 976 mnt->auth_flavor_len = 1;
01060c89
CL		 977 return 1;
978}
979
bf0fd768
CL		 980/*
981 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 982 * a data structure. The whole mount string is processed; bad options are
983 * skipped as they are encountered. If there were no errors, return 1;
984 * otherwise return 0 (zero).
bf0fd768
CL		 985 */
986static int nfs_parse_mount_options(char *raw,
987 struct nfs_parsed_mount_data *mnt)
988{
f9c3a380 989 char *p, *string, *secdata;
d23c45fd 990 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 991 unsigned short protofamily = AF_UNSPEC;
992 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 993
994 if (!raw) {
995 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
996 return 1;
997 }
998 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
999
f9c3a380
EP		 1000 secdata = alloc_secdata();
1001 if (!secdata)
1002 goto out_nomem;
1003
1004 rc = security_sb_copy_data(raw, secdata);
1005 if (rc)
1006 goto out_security_failure;
1007
1008 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1009 if (rc)
1010 goto out_security_failure;
1011
1012 free_secdata(secdata);
1013
bf0fd768
CL		 1014 while ((p = strsep(&raw, ",")) != NULL) {
1015 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1016 unsigned long option;
1017 int token;
bf0fd768
CL		 1018
1019 if (!*p)
1020 continue;
1021
1022 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1023
1024 token = match_token(p, nfs_mount_option_tokens, args);
1025 switch (token) {
f45663ce
CL		 1026
1027 /*
1028 * boolean options: foo/nofoo
1029 */
bf0fd768
CL		 1030 case Opt_soft:
1031 mnt->flags |= NFS_MOUNT_SOFT;
1032 break;
1033 case Opt_hard:
1034 mnt->flags &= ~NFS_MOUNT_SOFT;
1035 break;
bf0fd768
CL		 1036 case Opt_posix:
1037 mnt->flags |= NFS_MOUNT_POSIX;
1038 break;
1039 case Opt_noposix:
1040 mnt->flags &= ~NFS_MOUNT_POSIX;
1041 break;
1042 case Opt_cto:
1043 mnt->flags &= ~NFS_MOUNT_NOCTO;
1044 break;
1045 case Opt_nocto:
1046 mnt->flags |= NFS_MOUNT_NOCTO;
1047 break;
1048 case Opt_ac:
1049 mnt->flags &= ~NFS_MOUNT_NOAC;
1050 break;
1051 case Opt_noac:
1052 mnt->flags |= NFS_MOUNT_NOAC;
1053 break;
1054 case Opt_lock:
1055 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1056 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1057 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1058 break;
1059 case Opt_nolock:
1060 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1061 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1062 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1063 break;
1064 case Opt_v2:
1065 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1066 mnt->version = 2;
bf0fd768
CL		 1067 break;
1068 case Opt_v3:
1069 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1070 mnt->version = 3;
bf0fd768 1071 break;
764302cc
CL		 1072#ifdef CONFIG_NFS_V4
1073 case Opt_v4:
1074 mnt->flags &= ~NFS_MOUNT_VER3;
1075 mnt->version = 4;
1076 break;
1077#endif
bf0fd768
CL		 1078 case Opt_udp:
1079 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1080 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1081 break;
1082 case Opt_tcp:
1083 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1084 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1085 break;
2cf7ff7a
TT		 1086 case Opt_rdma:
1087 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1088 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1089 xprt_load_transport(p);
2cf7ff7a 1090 break;
bf0fd768
CL		 1091 case Opt_acl:
1092 mnt->flags &= ~NFS_MOUNT_NOACL;
1093 break;
1094 case Opt_noacl:
1095 mnt->flags |= NFS_MOUNT_NOACL;
1096 break;
1097 case Opt_rdirplus:
1098 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1099 break;
1100 case Opt_nordirplus:
1101 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1102 break;
75180df2
TM		 1103 case Opt_sharecache:
1104 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1105 break;
1106 case Opt_nosharecache:
1107 mnt->flags |= NFS_MOUNT_UNSHARED;
1108 break;
d740351b
CL		 1109 case Opt_resvport:
1110 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1111 break;
1112 case Opt_noresvport:
1113 mnt->flags |= NFS_MOUNT_NORESVPORT;
1114 break;
b797cac7
DH		 1115 case Opt_fscache:
1116 mnt->options |= NFS_OPTION_FSCACHE;
1117 kfree(mnt->fscache_uniq);
1118 mnt->fscache_uniq = NULL;
1119 break;
1120 case Opt_nofscache:
1121 mnt->options &= ~NFS_OPTION_FSCACHE;
1122 kfree(mnt->fscache_uniq);
1123 mnt->fscache_uniq = NULL;
1124 break;
bf0fd768 1125
f45663ce
CL		 1126 /*
1127 * options that take numeric values
1128 */
bf0fd768 1129 case Opt_port:
a5a16bae
CL		 1130 string = match_strdup(args);
1131 if (string == NULL)
1132 goto out_nomem;
1133 rc = strict_strtoul(string, 10, &option);
1134 kfree(string);
4be929be 1135 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1136 goto out_invalid_value;
1137 mnt->nfs_server.port = option;
bf0fd768
CL		 1138 break;
1139 case Opt_rsize:
a5a16bae
CL		 1140 string = match_strdup(args);
1141 if (string == NULL)
1142 goto out_nomem;
1143 rc = strict_strtoul(string, 10, &option);
1144 kfree(string);
1145 if (rc != 0)
d23c45fd
CL		 1146 goto out_invalid_value;
1147 mnt->rsize = option;
bf0fd768
CL		 1148 break;
1149 case Opt_wsize:
a5a16bae
CL		 1150 string = match_strdup(args);
1151 if (string == NULL)
1152 goto out_nomem;
1153 rc = strict_strtoul(string, 10, &option);
1154 kfree(string);
1155 if (rc != 0)
d23c45fd
CL		 1156 goto out_invalid_value;
1157 mnt->wsize = option;
bf0fd768
CL		 1158 break;
1159 case Opt_bsize:
a5a16bae
CL		 1160 string = match_strdup(args);
1161 if (string == NULL)
1162 goto out_nomem;
1163 rc = strict_strtoul(string, 10, &option);
1164 kfree(string);
1165 if (rc != 0)
d23c45fd
CL		 1166 goto out_invalid_value;
1167 mnt->bsize = option;
bf0fd768
CL		 1168 break;
1169 case Opt_timeo:
a5a16bae
CL		 1170 string = match_strdup(args);
1171 if (string == NULL)
1172 goto out_nomem;
1173 rc = strict_strtoul(string, 10, &option);
1174 kfree(string);
1175 if (rc != 0 || option == 0)
d23c45fd
CL		 1176 goto out_invalid_value;
1177 mnt->timeo = option;
bf0fd768
CL		 1178 break;
1179 case Opt_retrans:
a5a16bae
CL		 1180 string = match_strdup(args);
1181 if (string == NULL)
1182 goto out_nomem;
1183 rc = strict_strtoul(string, 10, &option);
1184 kfree(string);
1185 if (rc != 0 || option == 0)
d23c45fd
CL		 1186 goto out_invalid_value;
1187 mnt->retrans = option;
bf0fd768
CL		 1188 break;
1189 case Opt_acregmin:
a5a16bae
CL		 1190 string = match_strdup(args);
1191 if (string == NULL)
1192 goto out_nomem;
1193 rc = strict_strtoul(string, 10, &option);
1194 kfree(string);
1195 if (rc != 0)
d23c45fd
CL		 1196 goto out_invalid_value;
1197 mnt->acregmin = option;
bf0fd768
CL		 1198 break;
1199 case Opt_acregmax:
a5a16bae
CL		 1200 string = match_strdup(args);
1201 if (string == NULL)
1202 goto out_nomem;
1203 rc = strict_strtoul(string, 10, &option);
1204 kfree(string);
1205 if (rc != 0)
d23c45fd
CL		 1206 goto out_invalid_value;
1207 mnt->acregmax = option;
bf0fd768
CL		 1208 break;
1209 case Opt_acdirmin:
a5a16bae
CL		 1210 string = match_strdup(args);
1211 if (string == NULL)
1212 goto out_nomem;
1213 rc = strict_strtoul(string, 10, &option);
1214 kfree(string);
1215 if (rc != 0)
d23c45fd
CL		 1216 goto out_invalid_value;
1217 mnt->acdirmin = option;
bf0fd768
CL		 1218 break;
1219 case Opt_acdirmax:
a5a16bae
CL		 1220 string = match_strdup(args);
1221 if (string == NULL)
1222 goto out_nomem;
1223 rc = strict_strtoul(string, 10, &option);
1224 kfree(string);
1225 if (rc != 0)
d23c45fd
CL		 1226 goto out_invalid_value;
1227 mnt->acdirmax = option;
bf0fd768
CL		 1228 break;
1229 case Opt_actimeo:
a5a16bae
CL		 1230 string = match_strdup(args);
1231 if (string == NULL)
1232 goto out_nomem;
1233 rc = strict_strtoul(string, 10, &option);
1234 kfree(string);
1235 if (rc != 0)
d23c45fd
CL		 1236 goto out_invalid_value;
1237 mnt->acregmin = mnt->acregmax =
1238 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1239 break;
1240 case Opt_namelen:
a5a16bae
CL		 1241 string = match_strdup(args);
1242 if (string == NULL)
1243 goto out_nomem;
1244 rc = strict_strtoul(string, 10, &option);
1245 kfree(string);
1246 if (rc != 0)
d23c45fd
CL		 1247 goto out_invalid_value;
1248 mnt->namlen = option;
bf0fd768
CL		 1249 break;
1250 case Opt_mountport:
a5a16bae
CL		 1251 string = match_strdup(args);
1252 if (string == NULL)
1253 goto out_nomem;
1254 rc = strict_strtoul(string, 10, &option);
1255 kfree(string);
4be929be 1256 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1257 goto out_invalid_value;
1258 mnt->mount_server.port = option;
bf0fd768 1259 break;
bf0fd768 1260 case Opt_mountvers:
a5a16bae
CL		 1261 string = match_strdup(args);
1262 if (string == NULL)
1263 goto out_nomem;
1264 rc = strict_strtoul(string, 10, &option);
1265 kfree(string);
1266 if (rc != 0 ||
f45663ce 1267 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1268 option > NFS_MNT3_VERSION)
1269 goto out_invalid_value;
1270 mnt->mount_server.version = option;
bf0fd768 1271 break;
bf0fd768 1272 case Opt_nfsvers:
a5a16bae
CL		 1273 string = match_strdup(args);
1274 if (string == NULL)
1275 goto out_nomem;
1276 rc = strict_strtoul(string, 10, &option);
1277 kfree(string);
1278 if (rc != 0)
d23c45fd 1279 goto out_invalid_value;
bf0fd768 1280 switch (option) {
f45663ce 1281 case NFS2_VERSION:
bf0fd768 1282 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1283 mnt->version = 2;
bf0fd768 1284 break;
f45663ce 1285 case NFS3_VERSION:
bf0fd768 1286 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1287 mnt->version = 3;
1288 break;
1289#ifdef CONFIG_NFS_V4
1290 case NFS4_VERSION:
1291 mnt->flags &= ~NFS_MOUNT_VER3;
1292 mnt->version = 4;
bf0fd768 1293 break;
764302cc 1294#endif
bf0fd768 1295 default:
d23c45fd 1296 goto out_invalid_value;
bf0fd768
CL		 1297 }
1298 break;
3fd5be9e 1299 case Opt_minorversion:
f3f4f4ed
CL		 1300 string = match_strdup(args);
1301 if (string == NULL)
1302 goto out_nomem;
1303 rc = strict_strtoul(string, 10, &option);
1304 kfree(string);
1305 if (rc != 0)
1306 goto out_invalid_value;
1307 if (option > NFS4_MAX_MINOR_VERSION)
1308 goto out_invalid_value;
1309 mnt->minorversion = option;
3fd5be9e 1310 break;
bf0fd768 1311
f45663ce
CL		 1312 /*
1313 * options that take text values
1314 */
bf0fd768
CL		 1315 case Opt_sec:
1316 string = match_strdup(args);
1317 if (string == NULL)
1318 goto out_nomem;
01060c89 1319 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1320 kfree(string);
f45663ce 1321 if (!rc) {
f45663ce
CL		 1322 dfprintk(MOUNT, "NFS: unrecognized "
1323 "security flavor\n");
d23c45fd 1324 return 0;
f45663ce 1325 }
bf0fd768
CL		 1326 break;
1327 case Opt_proto:
1328 string = match_strdup(args);
1329 if (string == NULL)
1330 goto out_nomem;
1331 token = match_token(string,
1332 nfs_xprt_protocol_tokens, args);
bf0fd768 1333
ee671b01 1334 protofamily = AF_INET;
bf0fd768 1335 switch (token) {
ee671b01
JL		 1336 case Opt_xprt_udp6:
1337 protofamily = AF_INET6;
fdb66ff4 1338 case Opt_xprt_udp:
bf0fd768 1339 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1340 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1341 kfree(string);
bf0fd768 1342 break;
ee671b01
JL		 1343 case Opt_xprt_tcp6:
1344 protofamily = AF_INET6;
fdb66ff4 1345 case Opt_xprt_tcp:
bf0fd768 1346 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1347 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1348 kfree(string);
bf0fd768 1349 break;
2cf7ff7a
TT		 1350 case Opt_xprt_rdma:
1351 /* vector side protocols to TCP */
1352 mnt->flags |= NFS_MOUNT_TCP;
1353 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1354 xprt_load_transport(string);
d23c45fd 1355 kfree(string);
2cf7ff7a 1356 break;
bf0fd768 1357 default:
f45663ce
CL		 1358 dfprintk(MOUNT, "NFS: unrecognized "
1359 "transport protocol\n");
4223a4a1 1360 kfree(string);
d23c45fd 1361 return 0;
bf0fd768
CL		 1362 }
1363 break;
1364 case Opt_mountproto:
1365 string = match_strdup(args);
1366 if (string == NULL)
1367 goto out_nomem;
1368 token = match_token(string,
1369 nfs_xprt_protocol_tokens, args);
d508afb4 1370 kfree(string);
bf0fd768 1371
ee671b01 1372 mountfamily = AF_INET;
bf0fd768 1373 switch (token) {
ee671b01
JL		 1374 case Opt_xprt_udp6:
1375 mountfamily = AF_INET6;
fdb66ff4 1376 case Opt_xprt_udp:
0896a725 1377 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1378 break;
ee671b01
JL		 1379 case Opt_xprt_tcp6:
1380 mountfamily = AF_INET6;
fdb66ff4 1381 case Opt_xprt_tcp:
0896a725 1382 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1383 break;
2cf7ff7a 1384 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1385 default:
f45663ce
CL		 1386 dfprintk(MOUNT, "NFS: unrecognized "
1387 "transport protocol\n");
d23c45fd 1388 return 0;
bf0fd768
CL		 1389 }
1390 break;
1391 case Opt_addr:
1392 string = match_strdup(args);
1393 if (string == NULL)
1394 goto out_nomem;
53a0b9c4
CL		 1395 mnt->nfs_server.addrlen =
1396 rpc_pton(string, strlen(string),
1397 (struct sockaddr *)
1398 &mnt->nfs_server.address,
1399 sizeof(mnt->nfs_server.address));
bf0fd768 1400 kfree(string);
53a0b9c4
CL		 1401 if (mnt->nfs_server.addrlen == 0)
1402 goto out_invalid_address;
bf0fd768
CL		 1403 break;
1404 case Opt_clientaddr:
1405 string = match_strdup(args);
1406 if (string == NULL)
1407 goto out_nomem;
fc601477 1408 kfree(mnt->client_address);
bf0fd768
CL		 1409 mnt->client_address = string;
1410 break;
33832034
CL		 1411 case Opt_mounthost:
1412 string = match_strdup(args);
1413 if (string == NULL)
1414 goto out_nomem;
fc601477 1415 kfree(mnt->mount_server.hostname);
33832034
CL		 1416 mnt->mount_server.hostname = string;
1417 break;
0ac83779 1418 case Opt_mountaddr:
bf0fd768
CL		 1419 string = match_strdup(args);
1420 if (string == NULL)
1421 goto out_nomem;
53a0b9c4
CL		 1422 mnt->mount_server.addrlen =
1423 rpc_pton(string, strlen(string),
1424 (struct sockaddr *)
1425 &mnt->mount_server.address,
1426 sizeof(mnt->mount_server.address));
bf0fd768 1427 kfree(string);
53a0b9c4
CL		 1428 if (mnt->mount_server.addrlen == 0)
1429 goto out_invalid_address;
bf0fd768 1430 break;
7973c1f1
TM		 1431 case Opt_lookupcache:
1432 string = match_strdup(args);
1433 if (string == NULL)
1434 goto out_nomem;
1435 token = match_token(string,
1436 nfs_lookupcache_tokens, args);
1437 kfree(string);
1438 switch (token) {
1439 case Opt_lookupcache_all:
1440 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1441 break;
1442 case Opt_lookupcache_positive:
1443 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1444 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1445 break;
1446 case Opt_lookupcache_none:
1447 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1448 break;
1449 default:
7973c1f1
TM		 1450 dfprintk(MOUNT, "NFS: invalid "
1451 "lookupcache argument\n");
d23c45fd 1452 return 0;
7973c1f1
TM		 1453 };
1454 break;
a6d5ff64
CL		 1455 case Opt_fscache_uniq:
1456 string = match_strdup(args);
1457 if (string == NULL)
1458 goto out_nomem;
1459 kfree(mnt->fscache_uniq);
1460 mnt->fscache_uniq = string;
1461 mnt->options |= NFS_OPTION_FSCACHE;
1462 break;
5eebde23
SJ		 1463 case Opt_local_lock:
1464 string = match_strdup(args);
1465 if (string == NULL)
1466 goto out_nomem;
1467 token = match_token(string, nfs_local_lock_tokens,
1468 args);
1469 kfree(string);
1470 switch (token) {
1471 case Opt_local_lock_all:
1472 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1473 NFS_MOUNT_LOCAL_FCNTL);
1474 break;
1475 case Opt_local_lock_flock:
1476 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1477 break;
1478 case Opt_local_lock_posix:
1479 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1480 break;
1481 case Opt_local_lock_none:
1482 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1483 NFS_MOUNT_LOCAL_FCNTL);
1484 break;
1485 default:
1486 dfprintk(MOUNT, "NFS: invalid "
1487 "local_lock argument\n");
1488 return 0;
1489 };
1490 break;
bf0fd768 1491
f45663ce
CL		 1492 /*
1493 * Special options
1494 */
1495 case Opt_sloppy:
1496 sloppy = 1;
1497 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1498 break;
bf0fd768
CL		 1499 case Opt_userspace:
1500 case Opt_deprecated:
d33e4dfe
CL		 1501 dfprintk(MOUNT, "NFS: ignoring mount option "
1502 "'%s'\n", p);
bf0fd768
CL		 1503 break;
1504
1505 default:
d23c45fd 1506 invalid_option = 1;
f45663ce
CL		 1507 dfprintk(MOUNT, "NFS: unrecognized mount option "
1508 "'%s'\n", p);
bf0fd768
CL		 1509 }
1510 }
1511
d23c45fd
CL		 1512 if (!sloppy && invalid_option)
1513 return 0;
1514
ee671b01
JL		 1515 /*
1516 * verify that any proto=/mountproto= options match the address
1517 * familiies in the addr=/mountaddr= options.
1518 */
1519 if (protofamily != AF_UNSPEC &&
1520 protofamily != mnt->nfs_server.address.ss_family)
1521 goto out_proto_mismatch;
1522
1523 if (mountfamily != AF_UNSPEC) {
1524 if (mnt->mount_server.addrlen) {
1525 if (mountfamily != mnt->mount_server.address.ss_family)
1526 goto out_mountproto_mismatch;
1527 } else {
1528 if (mountfamily != mnt->nfs_server.address.ss_family)
1529 goto out_mountproto_mismatch;
1530 }
1531 }
1532
bf0fd768
CL		 1533 return 1;
1534
ee671b01
JL		 1535out_mountproto_mismatch:
1536 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1537 "option\n");
1538 return 0;
1539out_proto_mismatch:
1540 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1541 return 0;
53a0b9c4
CL		 1542out_invalid_address:
1543 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1544 return 0;
d23c45fd 1545out_invalid_value:
53a0b9c4 1546 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1547 return 0;
bf0fd768
CL		 1548out_nomem:
1549 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1550 return 0;
f9c3a380
EP		 1551out_security_failure:
1552 free_secdata(secdata);
1553 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1554 return 0;
bf0fd768
CL		 1555}
1556
ec88f28d
CL		 1557/*
1558 * Match the requested auth flavors with the list returned by
1559 * the server. Returns zero and sets the mount's authentication
1560 * flavor on success; returns -EACCES if server does not support
1561 * the requested flavor.
1562 */
1563static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1564 struct nfs_mount_request *request)
1565{
1566 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1567
5eecfde6
CL		 1568 /*
1569 * Certain releases of Linux's mountd return an empty
1570 * flavor list. To prevent behavioral regression with
1571 * these servers (ie. rejecting mounts that used to
1572 * succeed), revert to pre-2.6.32 behavior (no checking)
1573 * if the returned flavor list is empty.
1574 */
1575 if (server_authlist_len == 0)
1576 return 0;
1577
ec88f28d
CL		 1578 /*
1579 * We avoid sophisticated negotiating here, as there are
1580 * plenty of cases where we can get it wrong, providing
1581 * either too little or too much security.
1582 *
1583 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1584 * flavor listed first. However, some servers list
1585 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1586 * preferred default, in args->auth_flavors[0] if user
1587 * didn't specify sec= mount option.
1588 */
1589 for (i = 0; i < args->auth_flavor_len; i++)
1590 for (j = 0; j < server_authlist_len; j++)
1591 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1592 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1593 request->auth_flavs[j]);
1594 args->auth_flavors[0] = request->auth_flavs[j];
1595 return 0;
1596 }
1597
1598 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1599 nfs_umount(request);
1600 return -EACCES;
1601}
1602
0076d7b7
CL		 1603/*
1604 * Use the remote server's MOUNT service to request the NFS file handle
1605 * corresponding to the provided path.
1606 */
1607static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1608 struct nfs_fh *root_fh)
1609{
ec88f28d
CL		 1610 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1611 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1612 struct nfs_mount_request request = {
1613 .sap = (struct sockaddr *)
1614 &args->mount_server.address,
1615 .dirpath = args->nfs_server.export_path,
1616 .protocol = args->mount_server.protocol,
1617 .fh = root_fh,
50a737f8 1618 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1619 .auth_flav_len = &server_authlist_len,
1620 .auth_flavs = server_authlist,
c5d120f8 1621 };
4c568017 1622 int status;
0076d7b7
CL		 1623
1624 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1625 switch (args->version) {
1626 default:
1627 args->mount_server.version = NFS_MNT3_VERSION;
1628 break;
1629 case 2:
1630 args->mount_server.version = NFS_MNT_VERSION;
1631 }
0076d7b7 1632 }
c5d120f8 1633 request.version = args->mount_server.version;
0076d7b7 1634
33832034 1635 if (args->mount_server.hostname)
c5d120f8 1636 request.hostname = args->mount_server.hostname;
33832034 1637 else
c5d120f8 1638 request.hostname = args->nfs_server.hostname;
33832034 1639
0076d7b7
CL		 1640 /*
1641 * Construct the mount server's address.
1642 */
4c568017 1643 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1644 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1645 args->nfs_server.addrlen);
1646 args->mount_server.addrlen = args->nfs_server.addrlen;
1647 }
c5d120f8 1648 request.salen = args->mount_server.addrlen;
f5855fec 1649 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1650
1651 /*
1652 * Now ask the mount server to map our export path
1653 * to a file handle.
1654 */
c5d120f8 1655 status = nfs_mount(&request);
ec88f28d
CL		 1656 if (status != 0) {
1657 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1658 request.hostname, status);
1659 return status;
1660 }
0076d7b7 1661
ec88f28d
CL		 1662 /*
1663 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1664 */
1665 if (args->mount_server.version != NFS_MNT3_VERSION)
1666 return 0;
1667 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1668}
1669
d1aa0825
CL		 1670static int nfs_parse_simple_hostname(const char *dev_name,
1671 char **hostname, size_t maxnamlen,
1672 char **export_path, size_t maxpathlen)
dc045898
CL		 1673{
1674 size_t len;
1675 char *colon, *comma;
1676
1677 colon = strchr(dev_name, ':');
1678 if (colon == NULL)
1679 goto out_bad_devname;
1680
1681 len = colon - dev_name;
1682 if (len > maxnamlen)
1683 goto out_hostname;
1684
1685 /* N.B. caller will free nfs_server.hostname in all cases */
1686 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1687 if (!*hostname)
1688 goto out_nomem;
1689
1690 /* kill possible hostname list: not supported */
1691 comma = strchr(*hostname, ',');
1692 if (comma != NULL) {
1693 if (comma == *hostname)
1694 goto out_bad_devname;
1695 *comma = '\0';
1696 }
1697
1698 colon++;
1699 len = strlen(colon);
1700 if (len > maxpathlen)
1701 goto out_path;
1702 *export_path = kstrndup(colon, len, GFP_KERNEL);
1703 if (!*export_path)
1704 goto out_nomem;
1705
1706 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1707 return 0;
1708
1709out_bad_devname:
1710 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1711 return -EINVAL;
1712
1713out_nomem:
1714 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1715 return -ENOMEM;
1716
1717out_hostname:
1718 dfprintk(MOUNT, "NFS: server hostname too long\n");
1719 return -ENAMETOOLONG;
1720
1721out_path:
1722 dfprintk(MOUNT, "NFS: export pathname too long\n");
1723 return -ENAMETOOLONG;
1724}
1725
d1aa0825
CL		 1726/*
1727 * Hostname has square brackets around it because it contains one or
1728 * more colons. We look for the first closing square bracket, and a
1729 * colon must follow it.
1730 */
1731static int nfs_parse_protected_hostname(const char *dev_name,
1732 char **hostname, size_t maxnamlen,
1733 char **export_path, size_t maxpathlen)
1734{
1735 size_t len;
1736 char *start, *end;
1737
1738 start = (char *)(dev_name + 1);
1739
1740 end = strchr(start, ']');
1741 if (end == NULL)
1742 goto out_bad_devname;
1743 if (*(end + 1) != ':')
1744 goto out_bad_devname;
1745
1746 len = end - start;
1747 if (len > maxnamlen)
1748 goto out_hostname;
1749
1750 /* N.B. caller will free nfs_server.hostname in all cases */
1751 *hostname = kstrndup(start, len, GFP_KERNEL);
1752 if (*hostname == NULL)
1753 goto out_nomem;
1754
1755 end += 2;
1756 len = strlen(end);
1757 if (len > maxpathlen)
1758 goto out_path;
1759 *export_path = kstrndup(end, len, GFP_KERNEL);
1760 if (!*export_path)
1761 goto out_nomem;
1762
1763 return 0;
1764
1765out_bad_devname:
1766 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1767 return -EINVAL;
1768
1769out_nomem:
1770 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1771 return -ENOMEM;
1772
1773out_hostname:
1774 dfprintk(MOUNT, "NFS: server hostname too long\n");
1775 return -ENAMETOOLONG;
1776
1777out_path:
1778 dfprintk(MOUNT, "NFS: export pathname too long\n");
1779 return -ENAMETOOLONG;
1780}
1781
1782/*
1783 * Split "dev_name" into "hostname:export_path".
1784 *
1785 * The leftmost colon demarks the split between the server's hostname
1786 * and the export path. If the hostname starts with a left square
1787 * bracket, then it may contain colons.
1788 *
1789 * Note: caller frees hostname and export path, even on error.
1790 */
1791static int nfs_parse_devname(const char *dev_name,
1792 char **hostname, size_t maxnamlen,
1793 char **export_path, size_t maxpathlen)
1794{
1795 if (*dev_name == '[')
1796 return nfs_parse_protected_hostname(dev_name,
1797 hostname, maxnamlen,
1798 export_path, maxpathlen);
1799
1800 return nfs_parse_simple_hostname(dev_name,
1801 hostname, maxnamlen,
1802 export_path, maxpathlen);
1803}
1804
f7b422b1 1805/*
54ceac45
DH		 1806 * Validate the NFS2/NFS3 mount data
1807 * - fills in the mount root filehandle
136d558c
CL		 1808 *
1809 * For option strings, user space handles the following behaviors:
1810 *
1811 * + DNS: mapping server host name to IP address ("addr=" option)
1812 *
1813 * + failure mode: how to behave if a mount request can't be handled
1814 * immediately ("fg/bg" option)
1815 *
1816 * + retry: how often to retry a mount request ("retry=" option)
1817 *
1818 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1819 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1820 */
2283f8d6
TT		 1821static int nfs_validate_mount_data(void *options,
1822 struct nfs_parsed_mount_data *args,
136d558c
CL		 1823 struct nfs_fh *mntfh,
1824 const char *dev_name)
f7b422b1 1825{
2283f8d6 1826 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1827 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1828
5df36e78
CL		 1829 if (data == NULL)
1830 goto out_no_data;
f7b422b1 1831
54ceac45 1832 switch (data->version) {
5df36e78
CL		 1833 case 1:
1834 data->namlen = 0;
1835 case 2:
1836 data->bsize = 0;
1837 case 3:
1838 if (data->flags & NFS_MOUNT_VER3)
1839 goto out_no_v3;
1840 data->root.size = NFS2_FHSIZE;
1841 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1842 case 4:
1843 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1844 goto out_no_sec;
1845 case 5:
1846 memset(data->context, 0, sizeof(data->context));
1847 case 6:
b7e24457
TM		 1848 if (data->flags & NFS_MOUNT_VER3) {
1849 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1850 goto out_invalid_fh;
5df36e78 1851 mntfh->size = data->root.size;
764302cc
CL		 1852 args->version = 3;
1853 } else {
5df36e78 1854 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1855 args->version = 2;
1856 }
5df36e78 1857
5df36e78
CL		 1858
1859 memcpy(mntfh->data, data->root.data, mntfh->size);
1860 if (mntfh->size < sizeof(mntfh->data))
1861 memset(mntfh->data + mntfh->size, 0,
1862 sizeof(mntfh->data) - mntfh->size);
6e88e061 1863
2283f8d6
TT		 1864 /*
1865 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1866 * can deal with.
1867 */
ff3525a5 1868 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1869 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1870 args->rsize = data->rsize;
1871 args->wsize = data->wsize;
2283f8d6
TT		 1872 args->timeo = data->timeo;
1873 args->retrans = data->retrans;
1874 args->acregmin = data->acregmin;
1875 args->acregmax = data->acregmax;
1876 args->acdirmin = data->acdirmin;
1877 args->acdirmax = data->acdirmax;
4c568017 1878
4cfd74fc 1879 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1880 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1881 if (!nfs_verify_server_address(sap))
4c568017
CL		 1882 goto out_no_address;
1883
2283f8d6 1884 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1885 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1886 /* N.B. caller will free nfs_server.hostname in all cases */
1887 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1888 args->namlen = data->namlen;
1889 args->bsize = data->bsize;
dd07c947
CL		 1890
1891 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1892 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1893 if (!args->nfs_server.hostname)
1894 goto out_nomem;
f9c3a380 1895
5eebde23
SJ		 1896 if (!(data->flags & NFS_MOUNT_NONLM))
1897 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1898 NFS_MOUNT_LOCAL_FCNTL);
1899 else
1900 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1901 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1902 /*
1903 * The legacy version 6 binary mount data from userspace has a
1904 * field used only to transport selinux information into the
1905 * the kernel. To continue to support that functionality we
1906 * have a touch of selinux knowledge here in the NFS code. The
1907 * userspace code converted context=blah to just blah so we are
1908 * converting back to the full string selinux understands.
1909 */
1910 if (data->context[0]){
1911#ifdef CONFIG_SECURITY_SELINUX
1912 int rc;
1913 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1914 if (!opts_str)
1915 return -ENOMEM;
1916 strcpy(opts_str, "context=");
1917 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1918 strcat(opts_str, &data->context[0]);
1919 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1920 kfree(opts_str);
1921 if (rc)
1922 return rc;
1923#else
1924 return -EINVAL;
1925#endif
1926 }
1927
5df36e78 1928 break;
136d558c 1929 default: {
136d558c 1930 int status;
136d558c 1931
2283f8d6
TT		 1932 if (nfs_parse_mount_options((char *)options, args) == 0)
1933 return -EINVAL;
136d558c 1934
4cfd74fc 1935 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1936 goto out_no_address;
1937
764302cc
CL		 1938 if (args->version == 4)
1939#ifdef CONFIG_NFS_V4
1940 return nfs4_validate_text_mount_data(options,
1941 args, dev_name);
1942#else
1943 goto out_v4_not_compiled;
1944#endif
1945
f5855fec 1946 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1947
259875ef
TM		 1948 nfs_set_mount_transport_protocol(args);
1949
dc045898
CL		 1950 status = nfs_parse_devname(dev_name,
1951 &args->nfs_server.hostname,
1952 PAGE_SIZE,
1953 &args->nfs_server.export_path,
1954 NFS_MAXPATHLEN);
1955 if (!status)
1956 status = nfs_try_mount(args, mntfh);
136d558c 1957
dc045898
CL		 1958 kfree(args->nfs_server.export_path);
1959 args->nfs_server.export_path = NULL;
136d558c 1960
136d558c 1961 if (status)
fdc6e2c8 1962 return status;
136d558c 1963
136d558c
CL		 1964 break;
1965 }
f7b422b1 1966 }
54ceac45
DH		 1967
1968#ifndef CONFIG_NFS_V3
8a6e5deb 1969 if (args->version == 3)
5df36e78
CL		 1970 goto out_v3_not_compiled;
1971#endif /* !CONFIG_NFS_V3 */
f7b422b1 1972
5df36e78 1973 return 0;
f7b422b1 1974
5df36e78
CL		 1975out_no_data:
1976 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1977 return -EINVAL;
54ceac45 1978
5df36e78
CL		 1979out_no_v3:
1980 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1981 data->version);
1982 return -EINVAL;
f7b422b1 1983
5df36e78
CL		 1984out_no_sec:
1985 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1986 return -EINVAL;
1987
5df36e78
CL		 1988#ifndef CONFIG_NFS_V3
1989out_v3_not_compiled:
1990 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1991 return -EPROTONOSUPPORT;
1992#endif /* !CONFIG_NFS_V3 */
1993
764302cc
CL		 1994#ifndef CONFIG_NFS_V4
1995out_v4_not_compiled:
1996 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1997 return -EPROTONOSUPPORT;
1998#endif /* !CONFIG_NFS_V4 */
1999
63649bd7
CG		 2000out_nomem:
2001 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2002 return -ENOMEM;
2003
5df36e78
CL		 2004out_no_address:
2005 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2006 return -EINVAL;
2007
2008out_invalid_fh:
2009 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2010 return -EINVAL;
f7b422b1
DH		 2011}
2012
48b605f8
JL		 2013static int
2014nfs_compare_remount_data(struct nfs_server *nfss,
2015 struct nfs_parsed_mount_data *data)
2016{
2017 if (data->flags != nfss->flags ||
2018 data->rsize != nfss->rsize ||
2019 data->wsize != nfss->wsize ||
2020 data->retrans != nfss->client->cl_timeout->to_retries ||
2021 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2022 data->acregmin != nfss->acregmin / HZ ||
2023 data->acregmax != nfss->acregmax / HZ ||
2024 data->acdirmin != nfss->acdirmin / HZ ||
2025 data->acdirmax != nfss->acdirmax / HZ ||
2026 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2027 data->nfs_server.port != nfss->port ||
48b605f8 2028 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2029 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2030 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2031 return -EINVAL;
2032
2033 return 0;
2034}
2035
2036static int
2037nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2038{
2039 int error;
2040 struct nfs_server *nfss = sb->s_fs_info;
2041 struct nfs_parsed_mount_data *data;
2042 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2043 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2044 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2045
2046 /*
2047 * Userspace mount programs that send binary options generally send
2048 * them populated with default values. We have no way to know which
2049 * ones were explicitly specified. Fall back to legacy behavior and
2050 * just return success.
2051 */
31c94469
MZ		 2052 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2053 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2054 options->version <= 6))))
48b605f8
JL		 2055 return 0;
2056
2057 data = kzalloc(sizeof(*data), GFP_KERNEL);
2058 if (data == NULL)
2059 return -ENOMEM;
2060
2061 /* fill out struct with values from existing mount */
2062 data->flags = nfss->flags;
2063 data->rsize = nfss->rsize;
2064 data->wsize = nfss->wsize;
2065 data->retrans = nfss->client->cl_timeout->to_retries;
2066 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2067 data->acregmin = nfss->acregmin / HZ;
2068 data->acregmax = nfss->acregmax / HZ;
2069 data->acdirmin = nfss->acdirmin / HZ;
2070 data->acdirmax = nfss->acdirmax / HZ;
2071 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2072 data->nfs_server.port = nfss->port;
48b605f8
JL		 2073 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2074 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2075 data->nfs_server.addrlen);
2076
2077 /* overwrite those values with any that were specified */
2078 error = nfs_parse_mount_options((char *)options, data);
2079 if (error < 0)
2080 goto out;
2081
2082 /* compare new mount options with old ones */
2083 error = nfs_compare_remount_data(nfss, data);
2084out:
2085 kfree(data);
2086 return error;
2087}
2088
f7b422b1 2089/*
54ceac45 2090 * Initialise the common bits of the superblock
f7b422b1 2091 */
54ceac45 2092static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2093{
54ceac45 2094 struct nfs_server *server = NFS_SB(sb);
5006a76c 2095
54ceac45 2096 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2097
54ceac45
DH		 2098 /* We probably want something more informative here */
2099 snprintf(sb->s_id, sizeof(sb->s_id),
2100 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2101
54ceac45
DH		 2102 if (sb->s_blocksize == 0)
2103 sb->s_blocksize = nfs_block_bits(server->wsize,
2104 &sb->s_blocksize_bits);
f7b422b1 2105
54ceac45
DH		 2106 if (server->flags & NFS_MOUNT_NOAC)
2107 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 2108
32a88aa1
JA		 2109 sb->s_bdi = &server->backing_dev_info;
2110
54ceac45 2111 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2112}
2113
2114/*
54ceac45 2115 * Finish setting up an NFS2/3 superblock
f7b422b1 2116 */
2283f8d6
TT		 2117static void nfs_fill_super(struct super_block *sb,
2118 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2119{
2120 struct nfs_server *server = NFS_SB(sb);
5006a76c 2121
54ceac45
DH		 2122 sb->s_blocksize_bits = 0;
2123 sb->s_blocksize = 0;
2124 if (data->bsize)
2125 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2126
8a6e5deb 2127 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2128 /* The VFS shouldn't apply the umask to mode bits. We will do
2129 * so ourselves when necessary.
2130 */
2131 sb->s_flags |= MS_POSIXACL;
2132 sb->s_time_gran = 1;
816724e6 2133 }
54ceac45
DH		 2134
2135 sb->s_op = &nfs_sops;
2136 nfs_initialise_sb(sb);
f7b422b1
DH		 2137}
2138
2139/*
54ceac45 2140 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2141 */
54ceac45
DH		 2142static void nfs_clone_super(struct super_block *sb,
2143 const struct super_block *old_sb)
f7b422b1 2144{
54ceac45
DH		 2145 struct nfs_server *server = NFS_SB(sb);
2146
2147 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2148 sb->s_blocksize = old_sb->s_blocksize;
2149 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2150
8a6e5deb 2151 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2152 /* The VFS shouldn't apply the umask to mode bits. We will do
2153 * so ourselves when necessary.
f7b422b1
DH		 2154 */
2155 sb->s_flags |= MS_POSIXACL;
f7b422b1 2156 sb->s_time_gran = 1;
f7b422b1
DH		 2157 }
2158
54ceac45
DH		 2159 sb->s_op = old_sb->s_op;
2160 nfs_initialise_sb(sb);
f7b422b1
DH		 2161}
2162
275a5d24
TM		 2163static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2164{
2165 const struct nfs_server *a = s->s_fs_info;
2166 const struct rpc_clnt *clnt_a = a->client;
2167 const struct rpc_clnt *clnt_b = b->client;
2168
2169 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2170 goto Ebusy;
2171 if (a->nfs_client != b->nfs_client)
2172 goto Ebusy;
2173 if (a->flags != b->flags)
2174 goto Ebusy;
2175 if (a->wsize != b->wsize)
2176 goto Ebusy;
2177 if (a->rsize != b->rsize)
2178 goto Ebusy;
2179 if (a->acregmin != b->acregmin)
2180 goto Ebusy;
2181 if (a->acregmax != b->acregmax)
2182 goto Ebusy;
2183 if (a->acdirmin != b->acdirmin)
2184 goto Ebusy;
2185 if (a->acdirmax != b->acdirmax)
2186 goto Ebusy;
2187 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2188 goto Ebusy;
e89a5a43 2189 return 1;
275a5d24 2190Ebusy:
e89a5a43
TM		 2191 return 0;
2192}
2193
2194struct nfs_sb_mountdata {
2195 struct nfs_server *server;
2196 int mntflags;
2197};
2198
2199static int nfs_set_super(struct super_block *s, void *data)
2200{
2201 struct nfs_sb_mountdata *sb_mntdata = data;
2202 struct nfs_server *server = sb_mntdata->server;
2203 int ret;
2204
2205 s->s_flags = sb_mntdata->mntflags;
2206 s->s_fs_info = server;
2207 ret = set_anon_super(s, server);
2208 if (ret == 0)
2209 server->s_dev = s->s_dev;
2210 return ret;
2211}
2212
fd00a8ff
CL		 2213static int nfs_compare_super_address(struct nfs_server *server1,
2214 struct nfs_server *server2)
2215{
2216 struct sockaddr *sap1, *sap2;
2217
2218 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2219 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2220
2221 if (sap1->sa_family != sap2->sa_family)
2222 return 0;
2223
2224 switch (sap1->sa_family) {
2225 case AF_INET: {
2226 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2227 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2228 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2229 return 0;
2230 if (sin1->sin_port != sin2->sin_port)
2231 return 0;
2232 break;
2233 }
2234 case AF_INET6: {
2235 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2236 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2237 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2238 return 0;
2239 if (sin1->sin6_port != sin2->sin6_port)
2240 return 0;
2241 break;
2242 }
2243 default:
2244 return 0;
2245 }
2246
2247 return 1;
2248}
2249
e89a5a43
TM		 2250static int nfs_compare_super(struct super_block *sb, void *data)
2251{
2252 struct nfs_sb_mountdata *sb_mntdata = data;
2253 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2254 int mntflags = sb_mntdata->mntflags;
2255
fd00a8ff 2256 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2257 return 0;
2258 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2259 if (old->flags & NFS_MOUNT_UNSHARED)
2260 return 0;
2261 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2262 return 0;
2263 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2264}
2265
fa799759
MS		 2266static int nfs_bdi_register(struct nfs_server *server)
2267{
2268 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2269}
2270
816724e6
TM		 2271static int nfs_get_sb(struct file_system_type *fs_type,
2272 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2273{
f7b422b1
DH		 2274 struct nfs_server *server = NULL;
2275 struct super_block *s;
33852a1f
TM		 2276 struct nfs_parsed_mount_data *data;
2277 struct nfs_fh *mntfh;
54ceac45 2278 struct dentry *mntroot;
75180df2 2279 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2280 struct nfs_sb_mountdata sb_mntdata = {
2281 .mntflags = flags,
2282 };
33852a1f
TM		 2283 int error = -ENOMEM;
2284
1e657bd5 2285 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2286 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2287 if (data == NULL || mntfh == NULL)
2288 goto out_free_fh;
f7b422b1 2289
33852a1f 2290 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2291
54ceac45 2292 /* Validate the mount data */
33852a1f 2293 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2294 if (error < 0)
0655960f 2295 goto out;
f7b422b1 2296
764302cc
CL		 2297#ifdef CONFIG_NFS_V4
2298 if (data->version == 4) {
2299 error = nfs4_try_mount(flags, dev_name, data, mnt);
2300 kfree(data->client_address);
9699eda6 2301 kfree(data->nfs_server.export_path);
764302cc
CL		 2302 goto out;
2303 }
2304#endif /* CONFIG_NFS_V4 */
2305
54ceac45 2306 /* Get a volume representation */
33852a1f 2307 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2308 if (IS_ERR(server)) {
2309 error = PTR_ERR(server);
0655960f 2310 goto out;
f7b422b1 2311 }
e89a5a43 2312 sb_mntdata.server = server;
f7b422b1 2313
75180df2
TM		 2314 if (server->flags & NFS_MOUNT_UNSHARED)
2315 compare_super = NULL;
2316
54ceac45 2317 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2318 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2319 if (IS_ERR(s)) {
2320 error = PTR_ERR(s);
54ceac45 2321 goto out_err_nosb;
816724e6
TM		 2322 }
2323
54ceac45
DH		 2324 if (s->s_fs_info != server) {
2325 nfs_free_server(server);
2326 server = NULL;
fa799759
MS		 2327 } else {
2328 error = nfs_bdi_register(server);
2329 if (error)
cfbc0683 2330 goto error_splat_bdi;
54ceac45 2331 }
f7b422b1 2332
54ceac45
DH		 2333 if (!s->s_root) {
2334 /* initial superblock/root creation */
33852a1f 2335 nfs_fill_super(s, data);
2df54806
DH		 2336 nfs_fscache_get_super_cookie(
2337 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2338 }
f7b422b1 2339
33852a1f 2340 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2341 if (IS_ERR(mntroot)) {
2342 error = PTR_ERR(mntroot);
2343 goto error_splat_super;
f7b422b1 2344 }
816724e6 2345
33852a1f 2346 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2347 if (error)
2348 goto error_splat_root;
2349
54ceac45
DH		 2350 s->s_flags |= MS_ACTIVE;
2351 mnt->mnt_sb = s;
2352 mnt->mnt_root = mntroot;
0655960f
CL		 2353 error = 0;
2354
2355out:
33852a1f
TM		 2356 kfree(data->nfs_server.hostname);
2357 kfree(data->mount_server.hostname);
08734048 2358 kfree(data->fscache_uniq);
33852a1f
TM		 2359 security_free_mnt_opts(&data->lsm_opts);
2360out_free_fh:
b157b06c 2361 nfs_free_fhandle(mntfh);
33852a1f 2362 kfree(data);
0655960f 2363 return error;
816724e6 2364
54ceac45
DH		 2365out_err_nosb:
2366 nfs_free_server(server);
0655960f 2367 goto out;
54ceac45 2368
f9c3a380
EP		 2369error_splat_root:
2370 dput(mntroot);
54ceac45 2371error_splat_super:
cfbc0683
N		 2372 if (server && !s->s_root)
2373 bdi_unregister(&server->backing_dev_info);
2374error_splat_bdi:
6f5bbff9 2375 deactivate_locked_super(s);
0655960f 2376 goto out;
f7b422b1
DH		 2377}
2378
387c149b
TM		 2379/*
2380 * Ensure that we unregister the bdi before kill_anon_super
2381 * releases the device name
2382 */
2383static void nfs_put_super(struct super_block *s)
2384{
2385 struct nfs_server *server = NFS_SB(s);
2386
2387 bdi_unregister(&server->backing_dev_info);
2388}
2389
54ceac45
DH		 2390/*
2391 * Destroy an NFS2/3 superblock
2392 */
f7b422b1
DH		 2393static void nfs_kill_super(struct super_block *s)
2394{
2395 struct nfs_server *server = NFS_SB(s);
2396
2397 kill_anon_super(s);
08734048 2398 nfs_fscache_release_super_cookie(s);
54ceac45 2399 nfs_free_server(server);
f7b422b1
DH		 2400}
2401
54ceac45
DH		 2402/*
2403 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2404 */
31f43471
AV		 2405static struct dentry *
2406nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2407 const char *dev_name, void *raw_data)
f7b422b1
DH		 2408{
2409 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2410 struct super_block *s;
2411 struct nfs_server *server;
2412 struct dentry *mntroot;
75180df2 2413 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2414 struct nfs_sb_mountdata sb_mntdata = {
2415 .mntflags = flags,
2416 };
54ceac45 2417 int error;
f7b422b1 2418
31f43471 2419 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2420
54ceac45
DH		 2421 /* create a new volume representation */
2422 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2423 if (IS_ERR(server)) {
2424 error = PTR_ERR(server);
2425 goto out_err_noserver;
2426 }
e89a5a43 2427 sb_mntdata.server = server;
8fa5c000 2428
75180df2
TM		 2429 if (server->flags & NFS_MOUNT_UNSHARED)
2430 compare_super = NULL;
2431
54ceac45 2432 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2433 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2434 if (IS_ERR(s)) {
2435 error = PTR_ERR(s);
2436 goto out_err_nosb;
2437 }
5006a76c 2438
54ceac45
DH		 2439 if (s->s_fs_info != server) {
2440 nfs_free_server(server);
2441 server = NULL;
fa799759
MS		 2442 } else {
2443 error = nfs_bdi_register(server);
2444 if (error)
cfbc0683 2445 goto error_splat_bdi;
f7b422b1 2446 }
24c8dbbb 2447
54ceac45
DH		 2448 if (!s->s_root) {
2449 /* initial superblock/root creation */
54ceac45 2450 nfs_clone_super(s, data->sb);
2df54806 2451 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2452 }
f7b422b1 2453
54ceac45
DH		 2454 mntroot = nfs_get_root(s, data->fh);
2455 if (IS_ERR(mntroot)) {
2456 error = PTR_ERR(mntroot);
2457 goto error_splat_super;
f7b422b1 2458 }
e9cc6c23 2459 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2460 dput(mntroot);
2461 error = -ESTALE;
2462 goto error_splat_super;
2463 }
f7b422b1 2464
54ceac45 2465 s->s_flags |= MS_ACTIVE;
f7b422b1 2466
f9c3a380
EP		 2467 /* clone any lsm security options from the parent to the new sb */
2468 security_sb_clone_mnt_opts(data->sb, s);
2469
31f43471
AV		 2470 dprintk("<-- nfs_xdev_mount() = 0\n");
2471 return mntroot;
24c8dbbb 2472
54ceac45
DH		 2473out_err_nosb:
2474 nfs_free_server(server);
2475out_err_noserver:
31f43471
AV		 2476 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2477 return ERR_PTR(error);
f7b422b1 2478
54ceac45 2479error_splat_super:
cfbc0683
N		 2480 if (server && !s->s_root)
2481 bdi_unregister(&server->backing_dev_info);
2482error_splat_bdi:
6f5bbff9 2483 deactivate_locked_super(s);
31f43471
AV		 2484 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2485 return ERR_PTR(error);
f7b422b1
DH		 2486}
2487
54ceac45
DH		 2488#ifdef CONFIG_NFS_V4
2489
f7b422b1 2490/*
54ceac45 2491 * Finish setting up a cloned NFS4 superblock
f7b422b1 2492 */
54ceac45
DH		 2493static void nfs4_clone_super(struct super_block *sb,
2494 const struct super_block *old_sb)
f7b422b1 2495{
54ceac45
DH		 2496 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2497 sb->s_blocksize = old_sb->s_blocksize;
2498 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2499 sb->s_time_gran = 1;
54ceac45
DH		 2500 sb->s_op = old_sb->s_op;
2501 nfs_initialise_sb(sb);
f7b422b1
DH		 2502}
2503
54ceac45
DH		 2504/*
2505 * Set up an NFS4 superblock
2506 */
2507static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2508{
54ceac45
DH		 2509 sb->s_time_gran = 1;
2510 sb->s_op = &nfs4_sops;
2511 nfs_initialise_sb(sb);
f7b422b1
DH		 2512}
2513
01c3f052
TM		 2514static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2515{
5eebde23
SJ		 2516 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2517 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2518}
2519
7630c852
CL		 2520static int nfs4_validate_text_mount_data(void *options,
2521 struct nfs_parsed_mount_data *args,
2522 const char *dev_name)
2523{
2524 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2525
f5855fec 2526 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2527
2528 nfs_validate_transport_protocol(args);
2529
2530 nfs4_validate_mount_flags(args);
2531
2ecda72b
TM		 2532 if (args->version != 4) {
2533 dfprintk(MOUNT,
2534 "NFS4: Illegal mount version\n");
2535 return -EINVAL;
2536 }
2537
7630c852
CL		 2538 if (args->auth_flavor_len > 1) {
2539 dfprintk(MOUNT,
2540 "NFS4: Too many RPC auth flavours specified\n");
2541 return -EINVAL;
2542 }
2543
2544 if (args->client_address == NULL) {
2545 dfprintk(MOUNT,
2546 "NFS4: mount program didn't pass callback address\n");
2547 return -EINVAL;
2548 }
2549
2550 return nfs_parse_devname(dev_name,
2551 &args->nfs_server.hostname,
2552 NFS4_MAXNAMLEN,
2553 &args->nfs_server.export_path,
2554 NFS4_MAXPATHLEN);
2555}
2556
f0768ebd
CL		 2557/*
2558 * Validate NFSv4 mount options
2559 */
91ea40b9
TT		 2560static int nfs4_validate_mount_data(void *options,
2561 struct nfs_parsed_mount_data *args,
2562 const char *dev_name)
f0768ebd 2563{
4cfd74fc 2564 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2565 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2566 char *c;
2567
2568 if (data == NULL)
2569 goto out_no_data;
2570
2571 switch (data->version) {
2572 case 1:
4c568017
CL		 2573 if (data->host_addrlen > sizeof(args->nfs_server.address))
2574 goto out_no_address;
2575 if (data->host_addrlen == 0)
f0768ebd 2576 goto out_no_address;
4c568017 2577 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2578 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2579 return -EFAULT;
4cfd74fc 2580 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2581 goto out_no_address;
2582
6738b251
CL		 2583 if (data->auth_flavourlen) {
2584 if (data->auth_flavourlen > 1)
2585 goto out_inval_auth;
20c71f5e 2586 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2587 data->auth_flavours,
20c71f5e 2588 sizeof(args->auth_flavors[0])))
f0768ebd 2589 return -EFAULT;
f0768ebd
CL		 2590 }
2591
2592 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2593 if (IS_ERR(c))
2594 return PTR_ERR(c);
91ea40b9 2595 args->nfs_server.hostname = c;
f0768ebd
CL		 2596
2597 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2598 if (IS_ERR(c))
2599 return PTR_ERR(c);
91ea40b9
TT		 2600 args->nfs_server.export_path = c;
2601 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2602
2603 c = strndup_user(data->client_addr.data, 16);
2604 if (IS_ERR(c))
2605 return PTR_ERR(c);
91ea40b9
TT		 2606 args->client_address = c;
2607
2608 /*
2609 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2610 * can deal with.
2611 */
2612
2613 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2614 args->rsize = data->rsize;
2615 args->wsize = data->wsize;
2616 args->timeo = data->timeo;
2617 args->retrans = data->retrans;
2618 args->acregmin = data->acregmin;
2619 args->acregmax = data->acregmax;
2620 args->acdirmin = data->acdirmin;
2621 args->acdirmax = data->acdirmax;
2622 args->nfs_server.protocol = data->proto;
259875ef 2623 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2624
2625 break;
7630c852 2626 default:
91ea40b9 2627 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2628 return -EINVAL;
2629
4cfd74fc 2630 if (!nfs_verify_server_address(sap))
80071225 2631 return -EINVAL;
dc045898 2632
7630c852 2633 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2634 }
2635
2636 return 0;
2637
2638out_no_data:
2639 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2640 return -EINVAL;
2641
2642out_inval_auth:
2643 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2644 data->auth_flavourlen);
2645 return -EINVAL;
2646
2647out_no_address:
2648 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2649 return -EINVAL;
f0768ebd
CL		 2650}
2651
54ceac45 2652/*
c02d7adf 2653 * Get the superblock for the NFS4 root partition
54ceac45 2654 */
31f43471
AV		 2655static struct dentry *
2656nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2657 const char *dev_name, void *raw_data)
f7b422b1 2658{
c02d7adf 2659 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2660 struct super_block *s;
2661 struct nfs_server *server;
33852a1f 2662 struct nfs_fh *mntfh;
54ceac45 2663 struct dentry *mntroot;
75180df2 2664 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2665 struct nfs_sb_mountdata sb_mntdata = {
2666 .mntflags = flags,
2667 };
33852a1f
TM		 2668 int error = -ENOMEM;
2669
b157b06c 2670 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2671 if (data == NULL || mntfh == NULL)
2672 goto out_free_fh;
f7b422b1 2673
33852a1f 2674 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2675
54ceac45 2676 /* Get a volume representation */
33852a1f 2677 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2678 if (IS_ERR(server)) {
2679 error = PTR_ERR(server);
29eb981a 2680 goto out;
f7b422b1 2681 }
e89a5a43 2682 sb_mntdata.server = server;
f7b422b1 2683
75180df2
TM		 2684 if (server->flags & NFS4_MOUNT_UNSHARED)
2685 compare_super = NULL;
2686
54ceac45 2687 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2688 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2689 if (IS_ERR(s)) {
2690 error = PTR_ERR(s);
f7b422b1 2691 goto out_free;
816724e6
TM		 2692 }
2693
5dd3177a
TM		 2694 if (s->s_fs_info != server) {
2695 nfs_free_server(server);
2696 server = NULL;
fa799759
MS		 2697 } else {
2698 error = nfs_bdi_register(server);
2699 if (error)
cfbc0683 2700 goto error_splat_bdi;
5dd3177a
TM		 2701 }
2702
54ceac45
DH		 2703 if (!s->s_root) {
2704 /* initial superblock/root creation */
54ceac45 2705 nfs4_fill_super(s);
2df54806
DH		 2706 nfs_fscache_get_super_cookie(
2707 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2708 }
f7b422b1 2709
33852a1f 2710 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2711 if (IS_ERR(mntroot)) {
2712 error = PTR_ERR(mntroot);
2713 goto error_splat_super;
f7b422b1 2714 }
54ceac45 2715
33852a1f 2716 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2717 if (error)
2718 goto error_splat_root;
2719
f7b422b1 2720 s->s_flags |= MS_ACTIVE;
31f43471
AV		 2721
2722 security_free_mnt_opts(&data->lsm_opts);
2723 nfs_free_fhandle(mntfh);
2724 return mntroot;
29eb981a
CL		 2725
2726out:
33852a1f
TM		 2727 security_free_mnt_opts(&data->lsm_opts);
2728out_free_fh:
b157b06c 2729 nfs_free_fhandle(mntfh);
31f43471 2730 return ERR_PTR(error);
54ceac45 2731
f7b422b1 2732out_free:
54ceac45 2733 nfs_free_server(server);
29eb981a 2734 goto out;
54ceac45 2735
46c8ac74
EP		 2736error_splat_root:
2737 dput(mntroot);
54ceac45 2738error_splat_super:
cfbc0683
N		 2739 if (server && !s->s_root)
2740 bdi_unregister(&server->backing_dev_info);
2741error_splat_bdi:
6f5bbff9 2742 deactivate_locked_super(s);
29eb981a 2743 goto out;
f7b422b1
DH		 2744}
2745
c02d7adf
TM		 2746static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2747 int flags, void *data, const char *hostname)
2748{
2749 struct vfsmount *root_mnt;
2750 char *root_devname;
2751 size_t len;
2752
2753 len = strlen(hostname) + 3;
2754 root_devname = kmalloc(len, GFP_KERNEL);
2755 if (root_devname == NULL)
2756 return ERR_PTR(-ENOMEM);
2757 snprintf(root_devname, len, "%s:/", hostname);
2758 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2759 kfree(root_devname);
2760 return root_mnt;
2761}
2762
b88f8a54
TM		 2763static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2764{
2765 char *page = (char *) __get_free_page(GFP_KERNEL);
2766 char *devname, *tmp;
2767
2768 if (page == NULL)
2769 return;
2770 devname = nfs_path(path->mnt->mnt_devname,
2771 path->mnt->mnt_root, path->dentry,
2772 page, PAGE_SIZE);
cdd29ecf 2773 if (IS_ERR(devname))
b88f8a54
TM		 2774 goto out_freepage;
2775 tmp = kstrdup(devname, GFP_KERNEL);
2776 if (tmp == NULL)
2777 goto out_freepage;
2778 kfree(mnt->mnt_devname);
2779 mnt->mnt_devname = tmp;
2780out_freepage:
2781 free_page((unsigned long)page);
2782}
2783
ce587e07
TM		 2784struct nfs_referral_count {
2785 struct list_head list;
2786 const struct task_struct *task;
2787 unsigned int referral_count;
2788};
2789
2790static LIST_HEAD(nfs_referral_count_list);
2791static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2792
2793static struct nfs_referral_count *nfs_find_referral_count(void)
2794{
2795 struct nfs_referral_count *p;
2796
2797 list_for_each_entry(p, &nfs_referral_count_list, list) {
2798 if (p->task == current)
2799 return p;
2800 }
2801 return NULL;
2802}
2803
2804#define NFS_MAX_NESTED_REFERRALS 2
2805
2806static int nfs_referral_loop_protect(void)
2807{
2808 struct nfs_referral_count *p, *new;
2809 int ret = -ENOMEM;
2810
2811 new = kmalloc(sizeof(*new), GFP_KERNEL);
2812 if (!new)
2813 goto out;
2814 new->task = current;
2815 new->referral_count = 1;
2816
2817 ret = 0;
2818 spin_lock(&nfs_referral_count_list_lock);
2819 p = nfs_find_referral_count();
2820 if (p != NULL) {
2821 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2822 ret = -ELOOP;
2823 else
2824 p->referral_count++;
2825 } else {
2826 list_add(&new->list, &nfs_referral_count_list);
2827 new = NULL;
2828 }
2829 spin_unlock(&nfs_referral_count_list_lock);
2830 kfree(new);
2831out:
2832 return ret;
2833}
2834
2835static void nfs_referral_loop_unprotect(void)
2836{
2837 struct nfs_referral_count *p;
2838
2839 spin_lock(&nfs_referral_count_list_lock);
2840 p = nfs_find_referral_count();
2841 p->referral_count--;
2842 if (p->referral_count == 0)
2843 list_del(&p->list);
2844 else
2845 p = NULL;
2846 spin_unlock(&nfs_referral_count_list_lock);
2847 kfree(p);
2848}
2849
c02d7adf
TM		 2850static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2851 const char *export_path, struct vfsmount *mnt_target)
2852{
04ffdbe2 2853 struct nameidata *nd = NULL;
a2770d86 2854 struct mnt_namespace *ns_private;
c02d7adf
TM		 2855 struct super_block *s;
2856 int ret;
2857
04ffdbe2
TM		 2858 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2859 if (nd == NULL)
2860 return -ENOMEM;
2861
a2770d86
LT		 2862 ns_private = create_mnt_ns(root_mnt);
2863 ret = PTR_ERR(ns_private);
2864 if (IS_ERR(ns_private))
2865 goto out_mntput;
2866
ce587e07
TM		 2867 ret = nfs_referral_loop_protect();
2868 if (ret != 0)
2869 goto out_put_mnt_ns;
2870
c02d7adf 2871 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
04ffdbe2 2872 export_path, LOOKUP_FOLLOW, nd);
c02d7adf 2873
ce587e07 2874 nfs_referral_loop_unprotect();
a2770d86
LT		 2875 put_mnt_ns(ns_private);
2876
c02d7adf
TM		 2877 if (ret != 0)
2878 goto out_err;
2879
04ffdbe2 2880 s = nd->path.mnt->mnt_sb;
c02d7adf
TM		 2881 atomic_inc(&s->s_active);
2882 mnt_target->mnt_sb = s;
04ffdbe2 2883 mnt_target->mnt_root = dget(nd->path.dentry);
c02d7adf 2884
b88f8a54 2885 /* Correct the device pathname */
04ffdbe2 2886 nfs_fix_devname(&nd->path, mnt_target);
b88f8a54 2887
04ffdbe2
TM		 2888 path_put(&nd->path);
2889 kfree(nd);
c02d7adf
TM		 2890 down_write(&s->s_umount);
2891 return 0;
ce587e07
TM		 2892out_put_mnt_ns:
2893 put_mnt_ns(ns_private);
c02d7adf
TM		 2894out_mntput:
2895 mntput(root_mnt);
2896out_err:
04ffdbe2 2897 kfree(nd);
c02d7adf
TM		 2898 return ret;
2899}
2900
a6fe23be
CL		 2901static int nfs4_try_mount(int flags, const char *dev_name,
2902 struct nfs_parsed_mount_data *data,
2903 struct vfsmount *mnt)
2904{
2905 char *export_path;
2906 struct vfsmount *root_mnt;
2907 int error;
2908
2909 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2910
2911 export_path = data->nfs_server.export_path;
2912 data->nfs_server.export_path = "/";
2913 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2914 data->nfs_server.hostname);
2915 data->nfs_server.export_path = export_path;
2916
2917 error = PTR_ERR(root_mnt);
2918 if (IS_ERR(root_mnt))
2919 goto out;
2920
2921 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2922
2923out:
2924 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2925 error != 0 ? " [error]" : "");
2926 return error;
2927}
2928
c02d7adf
TM		 2929/*
2930 * Get the superblock for an NFS4 mountpoint
2931 */
2932static int nfs4_get_sb(struct file_system_type *fs_type,
2933 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2934{
2935 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2936 int error = -ENOMEM;
2937
c5811dbd 2938 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2939 if (data == NULL)
2940 goto out_free_data;
2941
2942 /* Validate the mount data */
2943 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2944 if (error < 0)
2945 goto out;
2946
a6fe23be 2947 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2948
2949out:
2950 kfree(data->client_address);
2951 kfree(data->nfs_server.export_path);
2952 kfree(data->nfs_server.hostname);
2953 kfree(data->fscache_uniq);
2954out_free_data:
2955 kfree(data);
2956 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2957 error != 0 ? " [error]" : "");
2958 return error;
2959}
2960
f7b422b1
DH		 2961static void nfs4_kill_super(struct super_block *sb)
2962{
2963 struct nfs_server *server = NFS_SB(sb);
2964
0f3e66c6 2965 dprintk("--> %s\n", __func__);
515d8611 2966 nfs_super_return_all_delegations(sb);
f7b422b1 2967 kill_anon_super(sb);
08734048 2968 nfs_fscache_release_super_cookie(sb);
54ceac45 2969 nfs_free_server(server);
0f3e66c6 2970 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2971}
2972
2973/*
54ceac45 2974 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2975 */
31f43471
AV		 2976static struct dentry *
2977nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2978 const char *dev_name, void *raw_data)
f7b422b1 2979{
54ceac45
DH		 2980 struct nfs_clone_mount *data = raw_data;
2981 struct super_block *s;
2982 struct nfs_server *server;
2983 struct dentry *mntroot;
75180df2 2984 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2985 struct nfs_sb_mountdata sb_mntdata = {
2986 .mntflags = flags,
2987 };
54ceac45 2988 int error;
f7b422b1 2989
31f43471 2990 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2991
54ceac45
DH		 2992 /* create a new volume representation */
2993 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2994 if (IS_ERR(server)) {
2995 error = PTR_ERR(server);
2996 goto out_err_noserver;
f7b422b1 2997 }
e89a5a43 2998 sb_mntdata.server = server;
f7b422b1 2999
75180df2
TM		 3000 if (server->flags & NFS4_MOUNT_UNSHARED)
3001 compare_super = NULL;
3002
54ceac45 3003 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3004 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3005 if (IS_ERR(s)) {
3006 error = PTR_ERR(s);
3007 goto out_err_nosb;
f7b422b1 3008 }
f7b422b1 3009
54ceac45
DH		 3010 if (s->s_fs_info != server) {
3011 nfs_free_server(server);
3012 server = NULL;
fa799759
MS		 3013 } else {
3014 error = nfs_bdi_register(server);
3015 if (error)
cfbc0683 3016 goto error_splat_bdi;
54ceac45 3017 }
f7b422b1 3018
54ceac45
DH		 3019 if (!s->s_root) {
3020 /* initial superblock/root creation */
54ceac45 3021 nfs4_clone_super(s, data->sb);
2df54806 3022 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 3023 }
f7b422b1 3024
54ceac45
DH		 3025 mntroot = nfs4_get_root(s, data->fh);
3026 if (IS_ERR(mntroot)) {
3027 error = PTR_ERR(mntroot);
3028 goto error_splat_super;
3029 }
e9cc6c23
TM		 3030 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3031 dput(mntroot);
3032 error = -ESTALE;
3033 goto error_splat_super;
3034 }
f7b422b1 3035
54ceac45 3036 s->s_flags |= MS_ACTIVE;
54ceac45 3037
46c8ac74
EP		 3038 security_sb_clone_mnt_opts(data->sb, s);
3039
31f43471
AV		 3040 dprintk("<-- nfs4_xdev_mount() = 0\n");
3041 return mntroot;
54ceac45
DH		 3042
3043out_err_nosb:
3044 nfs_free_server(server);
3045out_err_noserver:
31f43471
AV		 3046 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3047 return ERR_PTR(error);
54ceac45
DH		 3048
3049error_splat_super:
cfbc0683
N		 3050 if (server && !s->s_root)
3051 bdi_unregister(&server->backing_dev_info);
3052error_splat_bdi:
6f5bbff9 3053 deactivate_locked_super(s);
31f43471
AV		 3054 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3055 return ERR_PTR(error);
f7b422b1
DH		 3056}
3057
31f43471
AV		 3058static struct dentry *
3059nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3060 const char *dev_name, void *raw_data)
f7b422b1
DH		 3061{
3062 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 3063 struct super_block *s;
3064 struct nfs_server *server;
3065 struct dentry *mntroot;
4f727296 3066 struct nfs_fh *mntfh;
75180df2 3067 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 3068 struct nfs_sb_mountdata sb_mntdata = {
3069 .mntflags = flags,
3070 };
4f727296 3071 int error = -ENOMEM;
54ceac45
DH		 3072
3073 dprintk("--> nfs4_referral_get_sb()\n");
3074
4f727296
TM		 3075 mntfh = nfs_alloc_fhandle();
3076 if (mntfh == NULL)
3077 goto out_err_nofh;
3078
54ceac45 3079 /* create a new volume representation */
4f727296 3080 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3081 if (IS_ERR(server)) {
3082 error = PTR_ERR(server);
3083 goto out_err_noserver;
3084 }
e89a5a43 3085 sb_mntdata.server = server;
54ceac45 3086
75180df2
TM		 3087 if (server->flags & NFS4_MOUNT_UNSHARED)
3088 compare_super = NULL;
3089
54ceac45 3090 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3091 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3092 if (IS_ERR(s)) {
3093 error = PTR_ERR(s);
3094 goto out_err_nosb;
3095 }
3096
3097 if (s->s_fs_info != server) {
3098 nfs_free_server(server);
3099 server = NULL;
fa799759
MS		 3100 } else {
3101 error = nfs_bdi_register(server);
3102 if (error)
cfbc0683 3103 goto error_splat_bdi;
54ceac45
DH		 3104 }
3105
3106 if (!s->s_root) {
3107 /* initial superblock/root creation */
54ceac45 3108 nfs4_fill_super(s);
2df54806 3109 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3110 }
3111
4f727296 3112 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 3113 if (IS_ERR(mntroot)) {
3114 error = PTR_ERR(mntroot);
3115 goto error_splat_super;
3116 }
e9cc6c23
TM		 3117 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3118 dput(mntroot);
3119 error = -ESTALE;
3120 goto error_splat_super;
3121 }
54ceac45
DH		 3122
3123 s->s_flags |= MS_ACTIVE;
54ceac45 3124
46c8ac74
EP		 3125 security_sb_clone_mnt_opts(data->sb, s);
3126
4f727296 3127 nfs_free_fhandle(mntfh);
54ceac45 3128 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3129 return mntroot;
54ceac45
DH		 3130
3131out_err_nosb:
3132 nfs_free_server(server);
3133out_err_noserver:
4f727296
TM		 3134 nfs_free_fhandle(mntfh);
3135out_err_nofh:
54ceac45 3136 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3137 return ERR_PTR(error);
54ceac45
DH		 3138
3139error_splat_super:
cfbc0683
N		 3140 if (server && !s->s_root)
3141 bdi_unregister(&server->backing_dev_info);
3142error_splat_bdi:
6f5bbff9 3143 deactivate_locked_super(s);
4f727296 3144 nfs_free_fhandle(mntfh);
54ceac45 3145 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3146 return ERR_PTR(error);
f7b422b1
DH		 3147}
3148
c02d7adf
TM		 3149/*
3150 * Create an NFS4 server record on referral traversal
3151 */
3152static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3153 int flags, const char *dev_name, void *raw_data,
3154 struct vfsmount *mnt)
3155{
3156 struct nfs_clone_mount *data = raw_data;
3157 char *export_path;
3158 struct vfsmount *root_mnt;
3159 int error;
3160
3161 dprintk("--> nfs4_referral_get_sb()\n");
3162
3163 export_path = data->mnt_path;
3164 data->mnt_path = "/";
3165
3166 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3167 flags, data, data->hostname);
3168 data->mnt_path = export_path;
3169
3170 error = PTR_ERR(root_mnt);
3171 if (IS_ERR(root_mnt))
3172 goto out;
3173
3174 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3175out:
3176 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3177 error != 0 ? " [error]" : "");
3178 return error;
3179}
3180
54ceac45 3181#endif /* CONFIG_NFS_V4 */
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