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nfs: stop mangling ->mnt_devname on NFS
[linux-2.6-block.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 265static int nfs_show_options(struct seq_file *, struct vfsmount *);
c7f404b4
AV		 266static int nfs_show_devname(struct seq_file *, struct vfsmount *);
267static int nfs_show_path(struct seq_file *, struct vfsmount *);
f7b422b1 268static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 269static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
31f43471
AV		 270static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
271 int flags, const char *dev_name, void *raw_data);
387c149b 272static void nfs_put_super(struct super_block *);
f7b422b1 273static void nfs_kill_super(struct super_block *);
48b605f8 274static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 275
276static struct file_system_type nfs_fs_type = {
277 .owner = THIS_MODULE,
278 .name = "nfs",
279 .get_sb = nfs_get_sb,
280 .kill_sb = nfs_kill_super,
349457cc 281 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 282};
283
54ceac45 284struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 285 .owner = THIS_MODULE,
286 .name = "nfs",
31f43471 287 .mount = nfs_xdev_mount,
f7b422b1 288 .kill_sb = nfs_kill_super,
349457cc 289 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 290};
291
ee9b6d61 292static const struct super_operations nfs_sops = {
f7b422b1
DH		 293 .alloc_inode = nfs_alloc_inode,
294 .destroy_inode = nfs_destroy_inode,
295 .write_inode = nfs_write_inode,
387c149b 296 .put_super = nfs_put_super,
f7b422b1 297 .statfs = nfs_statfs,
b57922d9 298 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 299 .umount_begin = nfs_umount_begin,
300 .show_options = nfs_show_options,
c7f404b4
AV		 301 .show_devname = nfs_show_devname,
302 .show_path = nfs_show_path,
f7b422b1 303 .show_stats = nfs_show_stats,
48b605f8 304 .remount_fs = nfs_remount,
f7b422b1
DH		 305};
306
307#ifdef CONFIG_NFS_V4
7630c852
CL		 308static int nfs4_validate_text_mount_data(void *options,
309 struct nfs_parsed_mount_data *args, const char *dev_name);
a6fe23be
CL		 310static int nfs4_try_mount(int flags, const char *dev_name,
311 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
816724e6
TM		 312static int nfs4_get_sb(struct file_system_type *fs_type,
313 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
31f43471
AV		 314static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data);
316static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
54ceac45
DH		 318static int nfs4_referral_get_sb(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
31f43471
AV		 320static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 322static void nfs4_kill_super(struct super_block *sb);
323
324static struct file_system_type nfs4_fs_type = {
325 .owner = THIS_MODULE,
326 .name = "nfs4",
327 .get_sb = nfs4_get_sb,
328 .kill_sb = nfs4_kill_super,
349457cc 329 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 330};
331
c02d7adf
TM		 332static struct file_system_type nfs4_remote_fs_type = {
333 .owner = THIS_MODULE,
334 .name = "nfs4",
31f43471 335 .mount = nfs4_remote_mount,
c02d7adf
TM		 336 .kill_sb = nfs4_kill_super,
337 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
338};
339
54ceac45 340struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 341 .owner = THIS_MODULE,
342 .name = "nfs4",
31f43471 343 .mount = nfs4_xdev_mount,
f7b422b1 344 .kill_sb = nfs4_kill_super,
349457cc 345 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 346};
347
c02d7adf
TM		 348static struct file_system_type nfs4_remote_referral_fs_type = {
349 .owner = THIS_MODULE,
350 .name = "nfs4",
31f43471 351 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 352 .kill_sb = nfs4_kill_super,
353 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
354};
355
54ceac45 356struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 357 .owner = THIS_MODULE,
358 .name = "nfs4",
54ceac45 359 .get_sb = nfs4_referral_get_sb,
f7b422b1 360 .kill_sb = nfs4_kill_super,
349457cc 361 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 362};
363
ee9b6d61 364static const struct super_operations nfs4_sops = {
f7b422b1
DH		 365 .alloc_inode = nfs_alloc_inode,
366 .destroy_inode = nfs_destroy_inode,
367 .write_inode = nfs_write_inode,
387c149b 368 .put_super = nfs_put_super,
f7b422b1 369 .statfs = nfs_statfs,
b57922d9 370 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 371 .umount_begin = nfs_umount_begin,
372 .show_options = nfs_show_options,
c7f404b4
AV		 373 .show_devname = nfs_show_devname,
374 .show_path = nfs_show_path,
f7b422b1 375 .show_stats = nfs_show_stats,
48b605f8 376 .remount_fs = nfs_remount,
f7b422b1
DH		 377};
378#endif
379
8e1f936b
RR		 380static struct shrinker acl_shrinker = {
381 .shrink = nfs_access_cache_shrinker,
382 .seeks = DEFAULT_SEEKS,
383};
979df72e 384
f7b422b1
DH		 385/*
386 * Register the NFS filesystems
387 */
388int __init register_nfs_fs(void)
389{
390 int ret;
391
392 ret = register_filesystem(&nfs_fs_type);
393 if (ret < 0)
394 goto error_0;
395
f7b422b1
DH		 396 ret = nfs_register_sysctl();
397 if (ret < 0)
398 goto error_1;
89a09141 399#ifdef CONFIG_NFS_V4
f7b422b1
DH		 400 ret = register_filesystem(&nfs4_fs_type);
401 if (ret < 0)
402 goto error_2;
403#endif
8e1f936b 404 register_shrinker(&acl_shrinker);
f7b422b1
DH		 405 return 0;
406
407#ifdef CONFIG_NFS_V4
408error_2:
409 nfs_unregister_sysctl();
89a09141 410#endif
f7b422b1
DH		 411error_1:
412 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 413error_0:
414 return ret;
415}
416
417/*
418 * Unregister the NFS filesystems
419 */
420void __exit unregister_nfs_fs(void)
421{
8e1f936b 422 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 423#ifdef CONFIG_NFS_V4
424 unregister_filesystem(&nfs4_fs_type);
f7b422b1 425#endif
49af7ee1 426 nfs_unregister_sysctl();
f7b422b1
DH		 427 unregister_filesystem(&nfs_fs_type);
428}
429
1daef0a8 430void nfs_sb_active(struct super_block *sb)
ef818a28 431{
1daef0a8 432 struct nfs_server *server = NFS_SB(sb);
ef818a28 433
1daef0a8
TM		 434 if (atomic_inc_return(&server->active) == 1)
435 atomic_inc(&sb->s_active);
ef818a28
SD		 436}
437
1daef0a8 438void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 439{
440 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 441
442 if (atomic_dec_and_test(&server->active))
443 deactivate_super(sb);
ef818a28
SD		 444}
445
f7b422b1
DH		 446/*
447 * Deliver file system statistics to userspace
448 */
816724e6 449static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 450{
0c7d90cf 451 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 452 unsigned char blockbits;
453 unsigned long blockres;
0c7d90cf 454 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 455 struct nfs_fsstat res;
456 int error = -ENOMEM;
457
458 res.fattr = nfs_alloc_fattr();
459 if (res.fattr == NULL)
460 goto out_err;
f7b422b1 461
8fa5c000 462 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 463 if (unlikely(error == -ESTALE)) {
464 struct dentry *pd_dentry;
465
466 pd_dentry = dget_parent(dentry);
467 if (pd_dentry != NULL) {
468 nfs_zap_caches(pd_dentry->d_inode);
469 dput(pd_dentry);
470 }
471 }
ca7e9a0d 472 nfs_free_fattr(res.fattr);
f7b422b1
DH		 473 if (error < 0)
474 goto out_err;
ca7e9a0d 475
1a0ba9ae 476 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 477
478 /*
479 * Current versions of glibc do not correctly handle the
480 * case where f_frsize != f_bsize. Eventually we want to
481 * report the value of wtmult in this field.
482 */
0c7d90cf 483 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 484
485 /*
486 * On most *nix systems, f_blocks, f_bfree, and f_bavail
487 * are reported in units of f_frsize. Linux hasn't had
488 * an f_frsize field in its statfs struct until recently,
489 * thus historically Linux's sys_statfs reports these
490 * fields in units of f_bsize.
491 */
0c7d90cf
DH		 492 buf->f_bsize = dentry->d_sb->s_blocksize;
493 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 494 blockres = (1 << blockbits) - 1;
495 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
496 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
497 buf->f_bavail = (res.abytes + blockres) >> blockbits;
498
499 buf->f_files = res.tfiles;
500 buf->f_ffree = res.afiles;
501
502 buf->f_namelen = server->namelen;
1a0ba9ae 503
f7b422b1
DH		 504 return 0;
505
506 out_err:
3110ff80 507 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 508 return error;
f7b422b1
DH		 509}
510
7d4e2747
DH		 511/*
512 * Map the security flavour number to a name
513 */
81039f1f
TM		 514static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
515{
7d4e2747 516 static const struct {
81039f1f
TM		 517 rpc_authflavor_t flavour;
518 const char *str;
519 } sec_flavours[] = {
520 { RPC_AUTH_NULL, "null" },
521 { RPC_AUTH_UNIX, "sys" },
522 { RPC_AUTH_GSS_KRB5, "krb5" },
523 { RPC_AUTH_GSS_KRB5I, "krb5i" },
524 { RPC_AUTH_GSS_KRB5P, "krb5p" },
525 { RPC_AUTH_GSS_LKEY, "lkey" },
526 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
527 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
528 { RPC_AUTH_GSS_SPKM, "spkm" },
529 { RPC_AUTH_GSS_SPKMI, "spkmi" },
530 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 531 { UINT_MAX, "unknown" }
81039f1f
TM		 532 };
533 int i;
534
4d81cd16 535 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 536 if (sec_flavours[i].flavour == flavour)
537 break;
538 }
539 return sec_flavours[i].str;
540}
541
ee671b01
JL		 542static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
543 int showdefaults)
544{
545 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
546
547 seq_printf(m, ",mountproto=");
548 switch (sap->sa_family) {
549 case AF_INET:
550 switch (nfss->mountd_protocol) {
551 case IPPROTO_UDP:
552 seq_printf(m, RPCBIND_NETID_UDP);
553 break;
554 case IPPROTO_TCP:
555 seq_printf(m, RPCBIND_NETID_TCP);
556 break;
557 default:
558 if (showdefaults)
559 seq_printf(m, "auto");
560 }
561 break;
562 case AF_INET6:
563 switch (nfss->mountd_protocol) {
564 case IPPROTO_UDP:
565 seq_printf(m, RPCBIND_NETID_UDP6);
566 break;
567 case IPPROTO_TCP:
568 seq_printf(m, RPCBIND_NETID_TCP6);
569 break;
570 default:
571 if (showdefaults)
572 seq_printf(m, "auto");
573 }
574 break;
575 default:
576 if (showdefaults)
577 seq_printf(m, "auto");
578 }
579}
580
82d101d5
CL		 581static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
582 int showdefaults)
583{
584 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
585
d5eff1a3
BS		 586 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
587 return;
588
82d101d5
CL		 589 switch (sap->sa_family) {
590 case AF_INET: {
591 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 592 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 593 break;
594 }
595 case AF_INET6: {
596 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 597 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 598 break;
599 }
600 default:
601 if (showdefaults)
602 seq_printf(m, ",mountaddr=unspecified");
603 }
604
605 if (nfss->mountd_version || showdefaults)
606 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 607 if ((nfss->mountd_port &&
608 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
609 showdefaults)
82d101d5
CL		 610 seq_printf(m, ",mountport=%u", nfss->mountd_port);
611
ee671b01 612 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 613}
614
0be8189f
TM		 615#ifdef CONFIG_NFS_V4
616static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
617 int showdefaults)
618{
619 struct nfs_client *clp = nfss->nfs_client;
620
621 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
622 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
623}
624#else
625static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
626 int showdefaults)
627{
628}
629#endif
630
f7b422b1
DH		 631/*
632 * Describe the mount options in force on this server representation
633 */
82d101d5
CL		 634static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
635 int showdefaults)
f7b422b1 636{
509de811 637 static const struct proc_nfs_info {
f7b422b1 638 int flag;
509de811
DH		 639 const char *str;
640 const char *nostr;
f7b422b1
DH		 641 } nfs_info[] = {
642 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 643 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 644 { NFS_MOUNT_NOCTO, ",nocto", "" },
645 { NFS_MOUNT_NOAC, ",noac", "" },
646 { NFS_MOUNT_NONLM, ",nolock", "" },
647 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 648 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 649 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
650 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 651 { 0, NULL, NULL }
652 };
509de811 653 const struct proc_nfs_info *nfs_infop;
8fa5c000 654 struct nfs_client *clp = nfss->nfs_client;
82d101d5 655 u32 version = clp->rpc_ops->version;
7c563cc9 656 int local_flock, local_fcntl;
f7b422b1 657
82d101d5 658 seq_printf(m, ",vers=%u", version);
2d767432
CL		 659 seq_printf(m, ",rsize=%u", nfss->rsize);
660 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 661 if (nfss->bsize != 0)
662 seq_printf(m, ",bsize=%u", nfss->bsize);
663 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 664 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 665 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 666 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 667 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 668 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 669 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 670 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 671 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 672 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
673 if (nfss->flags & nfs_infop->flag)
674 seq_puts(m, nfs_infop->str);
675 else
676 seq_puts(m, nfs_infop->nostr);
677 }
56928edd 678 seq_printf(m, ",proto=%s",
ee671b01 679 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 680 if (version == 4) {
681 if (nfss->port != NFS_PORT)
682 seq_printf(m, ",port=%u", nfss->port);
683 } else
684 if (nfss->port)
685 seq_printf(m, ",port=%u", nfss->port);
686
33170233
TM		 687 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
688 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 689 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 690
691 if (version != 4)
692 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 693 else
694 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 695
b797cac7
DH		 696 if (nfss->options & NFS_OPTION_FSCACHE)
697 seq_printf(m, ",fsc");
9b00c643
PL		 698
699 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
701 seq_printf(m, ",lookupcache=none");
702 else
703 seq_printf(m, ",lookupcache=pos");
704 }
7c563cc9
SJ		 705
706 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
707 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
708
709 if (!local_flock && !local_fcntl)
710 seq_printf(m, ",local_lock=none");
711 else if (local_flock && local_fcntl)
712 seq_printf(m, ",local_lock=all");
713 else if (local_flock)
714 seq_printf(m, ",local_lock=flock");
715 else
716 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 717}
718
719/*
720 * Describe the mount options on this VFS mountpoint
721 */
722static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
723{
724 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
725
726 nfs_show_mount_options(m, nfss, 0);
727
5d8515ca
CL		 728 seq_printf(m, ",addr=%s",
729 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
730 RPC_DISPLAY_ADDR));
f7b422b1
DH		 731
732 return 0;
733}
734
c7f404b4
AV		 735static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
736{
737 char *page = (char *) __get_free_page(GFP_KERNEL);
738 char *devname, *dummy;
739 int err = 0;
740 if (!page)
741 return -ENOMEM;
742 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
743 if (IS_ERR(devname))
744 err = PTR_ERR(devname);
745 else
746 seq_escape(m, devname, " \t\n\\");
747 free_page((unsigned long)page);
748 return err;
749}
750
751static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
752{
753 seq_puts(m, "/");
754 return 0;
755}
756
f7b422b1
DH		 757/*
758 * Present statistical information for this VFS mountpoint
759 */
760static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
761{
762 int i, cpu;
763 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
764 struct rpc_auth *auth = nfss->client->cl_auth;
765 struct nfs_iostats totals = { };
766
767 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
768
769 /*
770 * Display all mount option settings
771 */
772 seq_printf(m, "\n\topts:\t");
773 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
774 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
775 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
776 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
777 nfs_show_mount_options(m, nfss, 1);
778
779 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
780
781 seq_printf(m, "\n\tcaps:\t");
782 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 783 seq_printf(m, ",wtmult=%u", nfss->wtmult);
784 seq_printf(m, ",dtsize=%u", nfss->dtsize);
785 seq_printf(m, ",bsize=%u", nfss->bsize);
786 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 787
788#ifdef CONFIG_NFS_V4
40c55319 789 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 790 seq_printf(m, "\n\tnfsv4:\t");
791 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
792 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
793 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
794 }
795#endif
796
797 /*
798 * Display security flavor in effect for this mount
799 */
2d767432 800 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 801 if (auth->au_flavor)
2d767432 802 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 803
804 /*
805 * Display superblock I/O counters
806 */
807 for_each_possible_cpu(cpu) {
808 struct nfs_iostats *stats;
809
810 preempt_disable();
811 stats = per_cpu_ptr(nfss->io_stats, cpu);
812
813 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
814 totals.events[i] += stats->events[i];
815 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
816 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 817#ifdef CONFIG_NFS_FSCACHE
818 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
819 totals.fscache[i] += stats->fscache[i];
820#endif
f7b422b1
DH		 821
822 preempt_enable();
823 }
824
825 seq_printf(m, "\n\tevents:\t");
826 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
827 seq_printf(m, "%lu ", totals.events[i]);
828 seq_printf(m, "\n\tbytes:\t");
829 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
830 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 831#ifdef CONFIG_NFS_FSCACHE
832 if (nfss->options & NFS_OPTION_FSCACHE) {
833 seq_printf(m, "\n\tfsc:\t");
834 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
835 seq_printf(m, "%Lu ", totals.bytes[i]);
836 }
837#endif
f7b422b1
DH		 838 seq_printf(m, "\n");
839
840 rpc_print_iostats(m, nfss->client);
841
842 return 0;
843}
844
845/*
846 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 847 * in response to xdev traversals and referrals
f7b422b1 848 */
42faad99 849static void nfs_umount_begin(struct super_block *sb)
f7b422b1 850{
67e55205 851 struct nfs_server *server;
fc6ae3cf
TM		 852 struct rpc_clnt *rpc;
853
67e55205 854 server = NFS_SB(sb);
fc6ae3cf
TM		 855 /* -EIO all pending I/O */
856 rpc = server->client_acl;
857 if (!IS_ERR(rpc))
858 rpc_killall_tasks(rpc);
859 rpc = server->client;
860 if (!IS_ERR(rpc))
861 rpc_killall_tasks(rpc);
f7b422b1
DH		 862}
863
c5811dbd 864static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 865{
866 struct nfs_parsed_mount_data *data;
867
868 data = kzalloc(sizeof(*data), GFP_KERNEL);
869 if (data) {
9423a08a
CL		 870 data->acregmin = NFS_DEF_ACREGMIN;
871 data->acregmax = NFS_DEF_ACREGMAX;
872 data->acdirmin = NFS_DEF_ACDIRMIN;
873 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 874 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 875 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 876 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 877 data->auth_flavors[0] = RPC_AUTH_UNIX;
878 data->auth_flavor_len = 1;
c5811dbd 879 data->version = version;
9423a08a
CL		 880 data->minorversion = 0;
881 }
882 return data;
883}
884
fc50d58f 885/*
cdcd7f9a
CL		 886 * Sanity-check a server address provided by the mount command.
887 *
888 * Address family must be initialized, and address must not be
889 * the ANY address for that family.
fc50d58f
CL		 890 */
891static int nfs_verify_server_address(struct sockaddr *addr)
892{
893 switch (addr->sa_family) {
894 case AF_INET: {
cdcd7f9a 895 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 896 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 897 }
898 case AF_INET6: {
899 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
900 return !ipv6_addr_any(sa);
fc50d58f
CL		 901 }
902 }
903
53a0b9c4 904 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 905 return 0;
906}
907
4cfd74fc
CL		 908/*
909 * Select between a default port value and a user-specified port value.
910 * If a zero value is set, then autobind will be used.
911 */
f5855fec 912static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 913 const unsigned short default_port)
914{
f5855fec
TM		 915 if (*port == NFS_UNSPEC_PORT)
916 *port = default_port;
4cfd74fc 917
f5855fec 918 rpc_set_port(sap, *port);
4cfd74fc
CL		 919}
920
259875ef
TM		 921/*
922 * Sanity check the NFS transport protocol.
923 *
924 */
925static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
926{
927 switch (mnt->nfs_server.protocol) {
928 case XPRT_TRANSPORT_UDP:
929 case XPRT_TRANSPORT_TCP:
930 case XPRT_TRANSPORT_RDMA:
931 break;
932 default:
933 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
934 }
935}
936
937/*
938 * For text based NFSv2/v3 mounts, the mount protocol transport default
939 * settings should depend upon the specified NFS transport.
940 */
941static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
942{
943 nfs_validate_transport_protocol(mnt);
944
945 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
946 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
947 return;
948 switch (mnt->nfs_server.protocol) {
949 case XPRT_TRANSPORT_UDP:
950 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
951 break;
952 case XPRT_TRANSPORT_TCP:
953 case XPRT_TRANSPORT_RDMA:
954 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
955 }
956}
957
01060c89
CL		 958/*
959 * Parse the value of the 'sec=' option.
01060c89
CL		 960 */
961static int nfs_parse_security_flavors(char *value,
962 struct nfs_parsed_mount_data *mnt)
963{
964 substring_t args[MAX_OPT_ARGS];
965
966 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
967
968 switch (match_token(value, nfs_secflavor_tokens, args)) {
969 case Opt_sec_none:
01060c89
CL		 970 mnt->auth_flavors[0] = RPC_AUTH_NULL;
971 break;
972 case Opt_sec_sys:
01060c89
CL		 973 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
974 break;
975 case Opt_sec_krb5:
01060c89
CL		 976 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
977 break;
978 case Opt_sec_krb5i:
01060c89
CL		 979 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
980 break;
981 case Opt_sec_krb5p:
01060c89
CL		 982 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
983 break;
984 case Opt_sec_lkey:
01060c89
CL		 985 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
986 break;
987 case Opt_sec_lkeyi:
01060c89
CL		 988 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
989 break;
990 case Opt_sec_lkeyp:
01060c89
CL		 991 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
992 break;
993 case Opt_sec_spkm:
01060c89
CL		 994 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
995 break;
996 case Opt_sec_spkmi:
01060c89
CL		 997 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
998 break;
999 case Opt_sec_spkmp:
01060c89
CL		 1000 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1001 break;
1002 default:
1003 return 0;
1004 }
1005
059f90b3 1006 mnt->auth_flavor_len = 1;
01060c89
CL		 1007 return 1;
1008}
1009
bf0fd768
CL		 1010/*
1011 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1012 * a data structure. The whole mount string is processed; bad options are
1013 * skipped as they are encountered. If there were no errors, return 1;
1014 * otherwise return 0 (zero).
bf0fd768
CL		 1015 */
1016static int nfs_parse_mount_options(char *raw,
1017 struct nfs_parsed_mount_data *mnt)
1018{
f9c3a380 1019 char *p, *string, *secdata;
d23c45fd 1020 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1021 unsigned short protofamily = AF_UNSPEC;
1022 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1023
1024 if (!raw) {
1025 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1026 return 1;
1027 }
1028 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1029
f9c3a380
EP		 1030 secdata = alloc_secdata();
1031 if (!secdata)
1032 goto out_nomem;
1033
1034 rc = security_sb_copy_data(raw, secdata);
1035 if (rc)
1036 goto out_security_failure;
1037
1038 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1039 if (rc)
1040 goto out_security_failure;
1041
1042 free_secdata(secdata);
1043
bf0fd768
CL		 1044 while ((p = strsep(&raw, ",")) != NULL) {
1045 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1046 unsigned long option;
1047 int token;
bf0fd768
CL		 1048
1049 if (!*p)
1050 continue;
1051
1052 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1053
1054 token = match_token(p, nfs_mount_option_tokens, args);
1055 switch (token) {
f45663ce
CL		 1056
1057 /*
1058 * boolean options: foo/nofoo
1059 */
bf0fd768
CL		 1060 case Opt_soft:
1061 mnt->flags |= NFS_MOUNT_SOFT;
1062 break;
1063 case Opt_hard:
1064 mnt->flags &= ~NFS_MOUNT_SOFT;
1065 break;
bf0fd768
CL		 1066 case Opt_posix:
1067 mnt->flags |= NFS_MOUNT_POSIX;
1068 break;
1069 case Opt_noposix:
1070 mnt->flags &= ~NFS_MOUNT_POSIX;
1071 break;
1072 case Opt_cto:
1073 mnt->flags &= ~NFS_MOUNT_NOCTO;
1074 break;
1075 case Opt_nocto:
1076 mnt->flags |= NFS_MOUNT_NOCTO;
1077 break;
1078 case Opt_ac:
1079 mnt->flags &= ~NFS_MOUNT_NOAC;
1080 break;
1081 case Opt_noac:
1082 mnt->flags |= NFS_MOUNT_NOAC;
1083 break;
1084 case Opt_lock:
1085 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1086 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1087 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1088 break;
1089 case Opt_nolock:
1090 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1091 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1092 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1093 break;
1094 case Opt_v2:
1095 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1096 mnt->version = 2;
bf0fd768
CL		 1097 break;
1098 case Opt_v3:
1099 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1100 mnt->version = 3;
bf0fd768 1101 break;
764302cc
CL		 1102 case Opt_v4:
1103 mnt->flags &= ~NFS_MOUNT_VER3;
1104 mnt->version = 4;
1105 break;
bf0fd768
CL		 1106 case Opt_udp:
1107 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1108 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1109 break;
1110 case Opt_tcp:
1111 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1112 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1113 break;
2cf7ff7a
TT		 1114 case Opt_rdma:
1115 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1116 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1117 xprt_load_transport(p);
2cf7ff7a 1118 break;
bf0fd768
CL		 1119 case Opt_acl:
1120 mnt->flags &= ~NFS_MOUNT_NOACL;
1121 break;
1122 case Opt_noacl:
1123 mnt->flags |= NFS_MOUNT_NOACL;
1124 break;
1125 case Opt_rdirplus:
1126 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1127 break;
1128 case Opt_nordirplus:
1129 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1130 break;
75180df2
TM		 1131 case Opt_sharecache:
1132 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1133 break;
1134 case Opt_nosharecache:
1135 mnt->flags |= NFS_MOUNT_UNSHARED;
1136 break;
d740351b
CL		 1137 case Opt_resvport:
1138 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1139 break;
1140 case Opt_noresvport:
1141 mnt->flags |= NFS_MOUNT_NORESVPORT;
1142 break;
b797cac7
DH		 1143 case Opt_fscache:
1144 mnt->options |= NFS_OPTION_FSCACHE;
1145 kfree(mnt->fscache_uniq);
1146 mnt->fscache_uniq = NULL;
1147 break;
1148 case Opt_nofscache:
1149 mnt->options &= ~NFS_OPTION_FSCACHE;
1150 kfree(mnt->fscache_uniq);
1151 mnt->fscache_uniq = NULL;
1152 break;
bf0fd768 1153
f45663ce
CL		 1154 /*
1155 * options that take numeric values
1156 */
bf0fd768 1157 case Opt_port:
a5a16bae
CL		 1158 string = match_strdup(args);
1159 if (string == NULL)
1160 goto out_nomem;
1161 rc = strict_strtoul(string, 10, &option);
1162 kfree(string);
4be929be 1163 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1164 goto out_invalid_value;
1165 mnt->nfs_server.port = option;
bf0fd768
CL		 1166 break;
1167 case Opt_rsize:
a5a16bae
CL		 1168 string = match_strdup(args);
1169 if (string == NULL)
1170 goto out_nomem;
1171 rc = strict_strtoul(string, 10, &option);
1172 kfree(string);
1173 if (rc != 0)
d23c45fd
CL		 1174 goto out_invalid_value;
1175 mnt->rsize = option;
bf0fd768
CL		 1176 break;
1177 case Opt_wsize:
a5a16bae
CL		 1178 string = match_strdup(args);
1179 if (string == NULL)
1180 goto out_nomem;
1181 rc = strict_strtoul(string, 10, &option);
1182 kfree(string);
1183 if (rc != 0)
d23c45fd
CL		 1184 goto out_invalid_value;
1185 mnt->wsize = option;
bf0fd768
CL		 1186 break;
1187 case Opt_bsize:
a5a16bae
CL		 1188 string = match_strdup(args);
1189 if (string == NULL)
1190 goto out_nomem;
1191 rc = strict_strtoul(string, 10, &option);
1192 kfree(string);
1193 if (rc != 0)
d23c45fd
CL		 1194 goto out_invalid_value;
1195 mnt->bsize = option;
bf0fd768
CL		 1196 break;
1197 case Opt_timeo:
a5a16bae
CL		 1198 string = match_strdup(args);
1199 if (string == NULL)
1200 goto out_nomem;
1201 rc = strict_strtoul(string, 10, &option);
1202 kfree(string);
1203 if (rc != 0 || option == 0)
d23c45fd
CL		 1204 goto out_invalid_value;
1205 mnt->timeo = option;
bf0fd768
CL		 1206 break;
1207 case Opt_retrans:
a5a16bae
CL		 1208 string = match_strdup(args);
1209 if (string == NULL)
1210 goto out_nomem;
1211 rc = strict_strtoul(string, 10, &option);
1212 kfree(string);
1213 if (rc != 0 || option == 0)
d23c45fd
CL		 1214 goto out_invalid_value;
1215 mnt->retrans = option;
bf0fd768
CL		 1216 break;
1217 case Opt_acregmin:
a5a16bae
CL		 1218 string = match_strdup(args);
1219 if (string == NULL)
1220 goto out_nomem;
1221 rc = strict_strtoul(string, 10, &option);
1222 kfree(string);
1223 if (rc != 0)
d23c45fd
CL		 1224 goto out_invalid_value;
1225 mnt->acregmin = option;
bf0fd768
CL		 1226 break;
1227 case Opt_acregmax:
a5a16bae
CL		 1228 string = match_strdup(args);
1229 if (string == NULL)
1230 goto out_nomem;
1231 rc = strict_strtoul(string, 10, &option);
1232 kfree(string);
1233 if (rc != 0)
d23c45fd
CL		 1234 goto out_invalid_value;
1235 mnt->acregmax = option;
bf0fd768
CL		 1236 break;
1237 case Opt_acdirmin:
a5a16bae
CL		 1238 string = match_strdup(args);
1239 if (string == NULL)
1240 goto out_nomem;
1241 rc = strict_strtoul(string, 10, &option);
1242 kfree(string);
1243 if (rc != 0)
d23c45fd
CL		 1244 goto out_invalid_value;
1245 mnt->acdirmin = option;
bf0fd768
CL		 1246 break;
1247 case Opt_acdirmax:
a5a16bae
CL		 1248 string = match_strdup(args);
1249 if (string == NULL)
1250 goto out_nomem;
1251 rc = strict_strtoul(string, 10, &option);
1252 kfree(string);
1253 if (rc != 0)
d23c45fd
CL		 1254 goto out_invalid_value;
1255 mnt->acdirmax = option;
bf0fd768
CL		 1256 break;
1257 case Opt_actimeo:
a5a16bae
CL		 1258 string = match_strdup(args);
1259 if (string == NULL)
1260 goto out_nomem;
1261 rc = strict_strtoul(string, 10, &option);
1262 kfree(string);
1263 if (rc != 0)
d23c45fd
CL		 1264 goto out_invalid_value;
1265 mnt->acregmin = mnt->acregmax =
1266 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1267 break;
1268 case Opt_namelen:
a5a16bae
CL		 1269 string = match_strdup(args);
1270 if (string == NULL)
1271 goto out_nomem;
1272 rc = strict_strtoul(string, 10, &option);
1273 kfree(string);
1274 if (rc != 0)
d23c45fd
CL		 1275 goto out_invalid_value;
1276 mnt->namlen = option;
bf0fd768
CL		 1277 break;
1278 case Opt_mountport:
a5a16bae
CL		 1279 string = match_strdup(args);
1280 if (string == NULL)
1281 goto out_nomem;
1282 rc = strict_strtoul(string, 10, &option);
1283 kfree(string);
4be929be 1284 if (rc != 0 || option > USHRT_MAX)
d23c45fd
CL		 1285 goto out_invalid_value;
1286 mnt->mount_server.port = option;
bf0fd768 1287 break;
bf0fd768 1288 case Opt_mountvers:
a5a16bae
CL		 1289 string = match_strdup(args);
1290 if (string == NULL)
1291 goto out_nomem;
1292 rc = strict_strtoul(string, 10, &option);
1293 kfree(string);
1294 if (rc != 0 ||
f45663ce 1295 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1296 option > NFS_MNT3_VERSION)
1297 goto out_invalid_value;
1298 mnt->mount_server.version = option;
bf0fd768 1299 break;
bf0fd768 1300 case Opt_nfsvers:
a5a16bae
CL		 1301 string = match_strdup(args);
1302 if (string == NULL)
1303 goto out_nomem;
1304 rc = strict_strtoul(string, 10, &option);
1305 kfree(string);
1306 if (rc != 0)
d23c45fd 1307 goto out_invalid_value;
bf0fd768 1308 switch (option) {
f45663ce 1309 case NFS2_VERSION:
bf0fd768 1310 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1311 mnt->version = 2;
bf0fd768 1312 break;
f45663ce 1313 case NFS3_VERSION:
bf0fd768 1314 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1315 mnt->version = 3;
1316 break;
764302cc
CL		 1317 case NFS4_VERSION:
1318 mnt->flags &= ~NFS_MOUNT_VER3;
1319 mnt->version = 4;
bf0fd768
CL		 1320 break;
1321 default:
d23c45fd 1322 goto out_invalid_value;
bf0fd768
CL		 1323 }
1324 break;
3fd5be9e 1325 case Opt_minorversion:
f3f4f4ed
CL		 1326 string = match_strdup(args);
1327 if (string == NULL)
1328 goto out_nomem;
1329 rc = strict_strtoul(string, 10, &option);
1330 kfree(string);
1331 if (rc != 0)
1332 goto out_invalid_value;
1333 if (option > NFS4_MAX_MINOR_VERSION)
1334 goto out_invalid_value;
1335 mnt->minorversion = option;
3fd5be9e 1336 break;
bf0fd768 1337
f45663ce
CL		 1338 /*
1339 * options that take text values
1340 */
bf0fd768
CL		 1341 case Opt_sec:
1342 string = match_strdup(args);
1343 if (string == NULL)
1344 goto out_nomem;
01060c89 1345 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1346 kfree(string);
f45663ce 1347 if (!rc) {
f45663ce
CL		 1348 dfprintk(MOUNT, "NFS: unrecognized "
1349 "security flavor\n");
d23c45fd 1350 return 0;
f45663ce 1351 }
bf0fd768
CL		 1352 break;
1353 case Opt_proto:
1354 string = match_strdup(args);
1355 if (string == NULL)
1356 goto out_nomem;
1357 token = match_token(string,
1358 nfs_xprt_protocol_tokens, args);
bf0fd768 1359
ee671b01 1360 protofamily = AF_INET;
bf0fd768 1361 switch (token) {
ee671b01
JL		 1362 case Opt_xprt_udp6:
1363 protofamily = AF_INET6;
fdb66ff4 1364 case Opt_xprt_udp:
bf0fd768 1365 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1366 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1367 kfree(string);
bf0fd768 1368 break;
ee671b01
JL		 1369 case Opt_xprt_tcp6:
1370 protofamily = AF_INET6;
fdb66ff4 1371 case Opt_xprt_tcp:
bf0fd768 1372 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1373 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1374 kfree(string);
bf0fd768 1375 break;
2cf7ff7a
TT		 1376 case Opt_xprt_rdma:
1377 /* vector side protocols to TCP */
1378 mnt->flags |= NFS_MOUNT_TCP;
1379 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1380 xprt_load_transport(string);
d23c45fd 1381 kfree(string);
2cf7ff7a 1382 break;
bf0fd768 1383 default:
f45663ce
CL		 1384 dfprintk(MOUNT, "NFS: unrecognized "
1385 "transport protocol\n");
4223a4a1 1386 kfree(string);
d23c45fd 1387 return 0;
bf0fd768
CL		 1388 }
1389 break;
1390 case Opt_mountproto:
1391 string = match_strdup(args);
1392 if (string == NULL)
1393 goto out_nomem;
1394 token = match_token(string,
1395 nfs_xprt_protocol_tokens, args);
d508afb4 1396 kfree(string);
bf0fd768 1397
ee671b01 1398 mountfamily = AF_INET;
bf0fd768 1399 switch (token) {
ee671b01
JL		 1400 case Opt_xprt_udp6:
1401 mountfamily = AF_INET6;
fdb66ff4 1402 case Opt_xprt_udp:
0896a725 1403 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1404 break;
ee671b01
JL		 1405 case Opt_xprt_tcp6:
1406 mountfamily = AF_INET6;
fdb66ff4 1407 case Opt_xprt_tcp:
0896a725 1408 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1409 break;
2cf7ff7a 1410 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1411 default:
f45663ce
CL		 1412 dfprintk(MOUNT, "NFS: unrecognized "
1413 "transport protocol\n");
d23c45fd 1414 return 0;
bf0fd768
CL		 1415 }
1416 break;
1417 case Opt_addr:
1418 string = match_strdup(args);
1419 if (string == NULL)
1420 goto out_nomem;
53a0b9c4
CL		 1421 mnt->nfs_server.addrlen =
1422 rpc_pton(string, strlen(string),
1423 (struct sockaddr *)
1424 &mnt->nfs_server.address,
1425 sizeof(mnt->nfs_server.address));
bf0fd768 1426 kfree(string);
53a0b9c4
CL		 1427 if (mnt->nfs_server.addrlen == 0)
1428 goto out_invalid_address;
bf0fd768
CL		 1429 break;
1430 case Opt_clientaddr:
1431 string = match_strdup(args);
1432 if (string == NULL)
1433 goto out_nomem;
fc601477 1434 kfree(mnt->client_address);
bf0fd768
CL		 1435 mnt->client_address = string;
1436 break;
33832034
CL		 1437 case Opt_mounthost:
1438 string = match_strdup(args);
1439 if (string == NULL)
1440 goto out_nomem;
fc601477 1441 kfree(mnt->mount_server.hostname);
33832034
CL		 1442 mnt->mount_server.hostname = string;
1443 break;
0ac83779 1444 case Opt_mountaddr:
bf0fd768
CL		 1445 string = match_strdup(args);
1446 if (string == NULL)
1447 goto out_nomem;
53a0b9c4
CL		 1448 mnt->mount_server.addrlen =
1449 rpc_pton(string, strlen(string),
1450 (struct sockaddr *)
1451 &mnt->mount_server.address,
1452 sizeof(mnt->mount_server.address));
bf0fd768 1453 kfree(string);
53a0b9c4
CL		 1454 if (mnt->mount_server.addrlen == 0)
1455 goto out_invalid_address;
bf0fd768 1456 break;
7973c1f1
TM		 1457 case Opt_lookupcache:
1458 string = match_strdup(args);
1459 if (string == NULL)
1460 goto out_nomem;
1461 token = match_token(string,
1462 nfs_lookupcache_tokens, args);
1463 kfree(string);
1464 switch (token) {
1465 case Opt_lookupcache_all:
1466 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1467 break;
1468 case Opt_lookupcache_positive:
1469 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1470 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1471 break;
1472 case Opt_lookupcache_none:
1473 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1474 break;
1475 default:
7973c1f1
TM		 1476 dfprintk(MOUNT, "NFS: invalid "
1477 "lookupcache argument\n");
d23c45fd 1478 return 0;
7973c1f1
TM		 1479 };
1480 break;
a6d5ff64
CL		 1481 case Opt_fscache_uniq:
1482 string = match_strdup(args);
1483 if (string == NULL)
1484 goto out_nomem;
1485 kfree(mnt->fscache_uniq);
1486 mnt->fscache_uniq = string;
1487 mnt->options |= NFS_OPTION_FSCACHE;
1488 break;
5eebde23
SJ		 1489 case Opt_local_lock:
1490 string = match_strdup(args);
1491 if (string == NULL)
1492 goto out_nomem;
1493 token = match_token(string, nfs_local_lock_tokens,
1494 args);
1495 kfree(string);
1496 switch (token) {
1497 case Opt_local_lock_all:
1498 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1499 NFS_MOUNT_LOCAL_FCNTL);
1500 break;
1501 case Opt_local_lock_flock:
1502 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1503 break;
1504 case Opt_local_lock_posix:
1505 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1506 break;
1507 case Opt_local_lock_none:
1508 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1509 NFS_MOUNT_LOCAL_FCNTL);
1510 break;
1511 default:
1512 dfprintk(MOUNT, "NFS: invalid "
1513 "local_lock argument\n");
1514 return 0;
1515 };
1516 break;
bf0fd768 1517
f45663ce
CL		 1518 /*
1519 * Special options
1520 */
1521 case Opt_sloppy:
1522 sloppy = 1;
1523 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1524 break;
bf0fd768
CL		 1525 case Opt_userspace:
1526 case Opt_deprecated:
d33e4dfe
CL		 1527 dfprintk(MOUNT, "NFS: ignoring mount option "
1528 "'%s'\n", p);
bf0fd768
CL		 1529 break;
1530
1531 default:
d23c45fd 1532 invalid_option = 1;
f45663ce
CL		 1533 dfprintk(MOUNT, "NFS: unrecognized mount option "
1534 "'%s'\n", p);
bf0fd768
CL		 1535 }
1536 }
1537
d23c45fd
CL		 1538 if (!sloppy && invalid_option)
1539 return 0;
1540
ee671b01
JL		 1541 /*
1542 * verify that any proto=/mountproto= options match the address
1543 * familiies in the addr=/mountaddr= options.
1544 */
1545 if (protofamily != AF_UNSPEC &&
1546 protofamily != mnt->nfs_server.address.ss_family)
1547 goto out_proto_mismatch;
1548
1549 if (mountfamily != AF_UNSPEC) {
1550 if (mnt->mount_server.addrlen) {
1551 if (mountfamily != mnt->mount_server.address.ss_family)
1552 goto out_mountproto_mismatch;
1553 } else {
1554 if (mountfamily != mnt->nfs_server.address.ss_family)
1555 goto out_mountproto_mismatch;
1556 }
1557 }
1558
bf0fd768
CL		 1559 return 1;
1560
ee671b01
JL		 1561out_mountproto_mismatch:
1562 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1563 "option\n");
1564 return 0;
1565out_proto_mismatch:
1566 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1567 return 0;
53a0b9c4
CL		 1568out_invalid_address:
1569 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1570 return 0;
d23c45fd 1571out_invalid_value:
53a0b9c4 1572 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1573 return 0;
bf0fd768
CL		 1574out_nomem:
1575 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1576 return 0;
f9c3a380
EP		 1577out_security_failure:
1578 free_secdata(secdata);
1579 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1580 return 0;
bf0fd768
CL		 1581}
1582
ec88f28d
CL		 1583/*
1584 * Match the requested auth flavors with the list returned by
1585 * the server. Returns zero and sets the mount's authentication
1586 * flavor on success; returns -EACCES if server does not support
1587 * the requested flavor.
1588 */
1589static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1590 struct nfs_mount_request *request)
1591{
1592 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1593
5eecfde6
CL		 1594 /*
1595 * Certain releases of Linux's mountd return an empty
1596 * flavor list. To prevent behavioral regression with
1597 * these servers (ie. rejecting mounts that used to
1598 * succeed), revert to pre-2.6.32 behavior (no checking)
1599 * if the returned flavor list is empty.
1600 */
1601 if (server_authlist_len == 0)
1602 return 0;
1603
ec88f28d
CL		 1604 /*
1605 * We avoid sophisticated negotiating here, as there are
1606 * plenty of cases where we can get it wrong, providing
1607 * either too little or too much security.
1608 *
1609 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1610 * flavor listed first. However, some servers list
1611 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1612 * preferred default, in args->auth_flavors[0] if user
1613 * didn't specify sec= mount option.
1614 */
1615 for (i = 0; i < args->auth_flavor_len; i++)
1616 for (j = 0; j < server_authlist_len; j++)
1617 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1618 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1619 request->auth_flavs[j]);
1620 args->auth_flavors[0] = request->auth_flavs[j];
1621 return 0;
1622 }
1623
1624 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1625 nfs_umount(request);
1626 return -EACCES;
1627}
1628
0076d7b7
CL		 1629/*
1630 * Use the remote server's MOUNT service to request the NFS file handle
1631 * corresponding to the provided path.
1632 */
1633static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1634 struct nfs_fh *root_fh)
1635{
ec88f28d
CL		 1636 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1637 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1638 struct nfs_mount_request request = {
1639 .sap = (struct sockaddr *)
1640 &args->mount_server.address,
1641 .dirpath = args->nfs_server.export_path,
1642 .protocol = args->mount_server.protocol,
1643 .fh = root_fh,
50a737f8 1644 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1645 .auth_flav_len = &server_authlist_len,
1646 .auth_flavs = server_authlist,
c5d120f8 1647 };
4c568017 1648 int status;
0076d7b7
CL		 1649
1650 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1651 switch (args->version) {
1652 default:
1653 args->mount_server.version = NFS_MNT3_VERSION;
1654 break;
1655 case 2:
1656 args->mount_server.version = NFS_MNT_VERSION;
1657 }
0076d7b7 1658 }
c5d120f8 1659 request.version = args->mount_server.version;
0076d7b7 1660
33832034 1661 if (args->mount_server.hostname)
c5d120f8 1662 request.hostname = args->mount_server.hostname;
33832034 1663 else
c5d120f8 1664 request.hostname = args->nfs_server.hostname;
33832034 1665
0076d7b7
CL		 1666 /*
1667 * Construct the mount server's address.
1668 */
4c568017 1669 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1670 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1671 args->nfs_server.addrlen);
1672 args->mount_server.addrlen = args->nfs_server.addrlen;
1673 }
c5d120f8 1674 request.salen = args->mount_server.addrlen;
f5855fec 1675 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1676
1677 /*
1678 * Now ask the mount server to map our export path
1679 * to a file handle.
1680 */
c5d120f8 1681 status = nfs_mount(&request);
ec88f28d
CL		 1682 if (status != 0) {
1683 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1684 request.hostname, status);
1685 return status;
1686 }
0076d7b7 1687
ec88f28d
CL		 1688 /*
1689 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1690 */
1691 if (args->mount_server.version != NFS_MNT3_VERSION)
1692 return 0;
1693 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1694}
1695
d1aa0825
CL		 1696static int nfs_parse_simple_hostname(const char *dev_name,
1697 char **hostname, size_t maxnamlen,
1698 char **export_path, size_t maxpathlen)
dc045898
CL		 1699{
1700 size_t len;
1701 char *colon, *comma;
1702
1703 colon = strchr(dev_name, ':');
1704 if (colon == NULL)
1705 goto out_bad_devname;
1706
1707 len = colon - dev_name;
1708 if (len > maxnamlen)
1709 goto out_hostname;
1710
1711 /* N.B. caller will free nfs_server.hostname in all cases */
1712 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1713 if (!*hostname)
1714 goto out_nomem;
1715
1716 /* kill possible hostname list: not supported */
1717 comma = strchr(*hostname, ',');
1718 if (comma != NULL) {
1719 if (comma == *hostname)
1720 goto out_bad_devname;
1721 *comma = '\0';
1722 }
1723
1724 colon++;
1725 len = strlen(colon);
1726 if (len > maxpathlen)
1727 goto out_path;
1728 *export_path = kstrndup(colon, len, GFP_KERNEL);
1729 if (!*export_path)
1730 goto out_nomem;
1731
1732 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1733 return 0;
1734
1735out_bad_devname:
1736 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1737 return -EINVAL;
1738
1739out_nomem:
1740 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1741 return -ENOMEM;
1742
1743out_hostname:
1744 dfprintk(MOUNT, "NFS: server hostname too long\n");
1745 return -ENAMETOOLONG;
1746
1747out_path:
1748 dfprintk(MOUNT, "NFS: export pathname too long\n");
1749 return -ENAMETOOLONG;
1750}
1751
d1aa0825
CL		 1752/*
1753 * Hostname has square brackets around it because it contains one or
1754 * more colons. We look for the first closing square bracket, and a
1755 * colon must follow it.
1756 */
1757static int nfs_parse_protected_hostname(const char *dev_name,
1758 char **hostname, size_t maxnamlen,
1759 char **export_path, size_t maxpathlen)
1760{
1761 size_t len;
1762 char *start, *end;
1763
1764 start = (char *)(dev_name + 1);
1765
1766 end = strchr(start, ']');
1767 if (end == NULL)
1768 goto out_bad_devname;
1769 if (*(end + 1) != ':')
1770 goto out_bad_devname;
1771
1772 len = end - start;
1773 if (len > maxnamlen)
1774 goto out_hostname;
1775
1776 /* N.B. caller will free nfs_server.hostname in all cases */
1777 *hostname = kstrndup(start, len, GFP_KERNEL);
1778 if (*hostname == NULL)
1779 goto out_nomem;
1780
1781 end += 2;
1782 len = strlen(end);
1783 if (len > maxpathlen)
1784 goto out_path;
1785 *export_path = kstrndup(end, len, GFP_KERNEL);
1786 if (!*export_path)
1787 goto out_nomem;
1788
1789 return 0;
1790
1791out_bad_devname:
1792 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1793 return -EINVAL;
1794
1795out_nomem:
1796 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1797 return -ENOMEM;
1798
1799out_hostname:
1800 dfprintk(MOUNT, "NFS: server hostname too long\n");
1801 return -ENAMETOOLONG;
1802
1803out_path:
1804 dfprintk(MOUNT, "NFS: export pathname too long\n");
1805 return -ENAMETOOLONG;
1806}
1807
1808/*
1809 * Split "dev_name" into "hostname:export_path".
1810 *
1811 * The leftmost colon demarks the split between the server's hostname
1812 * and the export path. If the hostname starts with a left square
1813 * bracket, then it may contain colons.
1814 *
1815 * Note: caller frees hostname and export path, even on error.
1816 */
1817static int nfs_parse_devname(const char *dev_name,
1818 char **hostname, size_t maxnamlen,
1819 char **export_path, size_t maxpathlen)
1820{
1821 if (*dev_name == '[')
1822 return nfs_parse_protected_hostname(dev_name,
1823 hostname, maxnamlen,
1824 export_path, maxpathlen);
1825
1826 return nfs_parse_simple_hostname(dev_name,
1827 hostname, maxnamlen,
1828 export_path, maxpathlen);
1829}
1830
f7b422b1 1831/*
54ceac45
DH		 1832 * Validate the NFS2/NFS3 mount data
1833 * - fills in the mount root filehandle
136d558c
CL		 1834 *
1835 * For option strings, user space handles the following behaviors:
1836 *
1837 * + DNS: mapping server host name to IP address ("addr=" option)
1838 *
1839 * + failure mode: how to behave if a mount request can't be handled
1840 * immediately ("fg/bg" option)
1841 *
1842 * + retry: how often to retry a mount request ("retry=" option)
1843 *
1844 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1845 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1846 */
2283f8d6
TT		 1847static int nfs_validate_mount_data(void *options,
1848 struct nfs_parsed_mount_data *args,
136d558c
CL		 1849 struct nfs_fh *mntfh,
1850 const char *dev_name)
f7b422b1 1851{
2283f8d6 1852 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1853 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1854
5df36e78
CL		 1855 if (data == NULL)
1856 goto out_no_data;
f7b422b1 1857
54ceac45 1858 switch (data->version) {
5df36e78
CL		 1859 case 1:
1860 data->namlen = 0;
1861 case 2:
1862 data->bsize = 0;
1863 case 3:
1864 if (data->flags & NFS_MOUNT_VER3)
1865 goto out_no_v3;
1866 data->root.size = NFS2_FHSIZE;
1867 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1868 case 4:
1869 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1870 goto out_no_sec;
1871 case 5:
1872 memset(data->context, 0, sizeof(data->context));
1873 case 6:
b7e24457
TM		 1874 if (data->flags & NFS_MOUNT_VER3) {
1875 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1876 goto out_invalid_fh;
5df36e78 1877 mntfh->size = data->root.size;
764302cc
CL		 1878 args->version = 3;
1879 } else {
5df36e78 1880 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1881 args->version = 2;
1882 }
5df36e78 1883
5df36e78
CL		 1884
1885 memcpy(mntfh->data, data->root.data, mntfh->size);
1886 if (mntfh->size < sizeof(mntfh->data))
1887 memset(mntfh->data + mntfh->size, 0,
1888 sizeof(mntfh->data) - mntfh->size);
6e88e061 1889
2283f8d6
TT		 1890 /*
1891 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1892 * can deal with.
1893 */
ff3525a5 1894 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1895 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1896 args->rsize = data->rsize;
1897 args->wsize = data->wsize;
2283f8d6
TT		 1898 args->timeo = data->timeo;
1899 args->retrans = data->retrans;
1900 args->acregmin = data->acregmin;
1901 args->acregmax = data->acregmax;
1902 args->acdirmin = data->acdirmin;
1903 args->acdirmax = data->acdirmax;
4c568017 1904
4cfd74fc 1905 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1906 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1907 if (!nfs_verify_server_address(sap))
4c568017
CL		 1908 goto out_no_address;
1909
2283f8d6 1910 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1911 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1912 /* N.B. caller will free nfs_server.hostname in all cases */
1913 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1914 args->namlen = data->namlen;
1915 args->bsize = data->bsize;
dd07c947
CL		 1916
1917 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1918 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1919 if (!args->nfs_server.hostname)
1920 goto out_nomem;
f9c3a380 1921
5eebde23
SJ		 1922 if (!(data->flags & NFS_MOUNT_NONLM))
1923 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1924 NFS_MOUNT_LOCAL_FCNTL);
1925 else
1926 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1927 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1928 /*
1929 * The legacy version 6 binary mount data from userspace has a
1930 * field used only to transport selinux information into the
1931 * the kernel. To continue to support that functionality we
1932 * have a touch of selinux knowledge here in the NFS code. The
1933 * userspace code converted context=blah to just blah so we are
1934 * converting back to the full string selinux understands.
1935 */
1936 if (data->context[0]){
1937#ifdef CONFIG_SECURITY_SELINUX
1938 int rc;
1939 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1940 if (!opts_str)
1941 return -ENOMEM;
1942 strcpy(opts_str, "context=");
1943 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1944 strcat(opts_str, &data->context[0]);
1945 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1946 kfree(opts_str);
1947 if (rc)
1948 return rc;
1949#else
1950 return -EINVAL;
1951#endif
1952 }
1953
5df36e78 1954 break;
136d558c 1955 default: {
136d558c 1956 int status;
136d558c 1957
2283f8d6
TT		 1958 if (nfs_parse_mount_options((char *)options, args) == 0)
1959 return -EINVAL;
136d558c 1960
4cfd74fc 1961 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1962 goto out_no_address;
1963
764302cc
CL		 1964 if (args->version == 4)
1965#ifdef CONFIG_NFS_V4
1966 return nfs4_validate_text_mount_data(options,
1967 args, dev_name);
1968#else
1969 goto out_v4_not_compiled;
1970#endif
1971
f5855fec 1972 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1973
259875ef
TM		 1974 nfs_set_mount_transport_protocol(args);
1975
dc045898
CL		 1976 status = nfs_parse_devname(dev_name,
1977 &args->nfs_server.hostname,
1978 PAGE_SIZE,
1979 &args->nfs_server.export_path,
1980 NFS_MAXPATHLEN);
1981 if (!status)
1982 status = nfs_try_mount(args, mntfh);
136d558c 1983
dc045898
CL		 1984 kfree(args->nfs_server.export_path);
1985 args->nfs_server.export_path = NULL;
136d558c 1986
136d558c 1987 if (status)
fdc6e2c8 1988 return status;
136d558c 1989
136d558c
CL		 1990 break;
1991 }
f7b422b1 1992 }
54ceac45
DH		 1993
1994#ifndef CONFIG_NFS_V3
8a6e5deb 1995 if (args->version == 3)
5df36e78
CL		 1996 goto out_v3_not_compiled;
1997#endif /* !CONFIG_NFS_V3 */
f7b422b1 1998
5df36e78 1999 return 0;
f7b422b1 2000
5df36e78
CL		 2001out_no_data:
2002 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2003 return -EINVAL;
54ceac45 2004
5df36e78
CL		 2005out_no_v3:
2006 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2007 data->version);
2008 return -EINVAL;
f7b422b1 2009
5df36e78
CL		 2010out_no_sec:
2011 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2012 return -EINVAL;
2013
5df36e78
CL		 2014#ifndef CONFIG_NFS_V3
2015out_v3_not_compiled:
2016 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2017 return -EPROTONOSUPPORT;
2018#endif /* !CONFIG_NFS_V3 */
2019
764302cc
CL		 2020#ifndef CONFIG_NFS_V4
2021out_v4_not_compiled:
2022 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2023 return -EPROTONOSUPPORT;
2024#endif /* !CONFIG_NFS_V4 */
2025
63649bd7
CG		 2026out_nomem:
2027 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2028 return -ENOMEM;
2029
5df36e78
CL		 2030out_no_address:
2031 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2032 return -EINVAL;
2033
2034out_invalid_fh:
2035 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2036 return -EINVAL;
f7b422b1
DH		 2037}
2038
48b605f8
JL		 2039static int
2040nfs_compare_remount_data(struct nfs_server *nfss,
2041 struct nfs_parsed_mount_data *data)
2042{
2043 if (data->flags != nfss->flags ||
2044 data->rsize != nfss->rsize ||
2045 data->wsize != nfss->wsize ||
2046 data->retrans != nfss->client->cl_timeout->to_retries ||
2047 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2048 data->acregmin != nfss->acregmin / HZ ||
2049 data->acregmax != nfss->acregmax / HZ ||
2050 data->acdirmin != nfss->acdirmin / HZ ||
2051 data->acdirmax != nfss->acdirmax / HZ ||
2052 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2053 data->nfs_server.port != nfss->port ||
48b605f8 2054 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2055 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2056 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2057 return -EINVAL;
2058
2059 return 0;
2060}
2061
2062static int
2063nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2064{
2065 int error;
2066 struct nfs_server *nfss = sb->s_fs_info;
2067 struct nfs_parsed_mount_data *data;
2068 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2069 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2070 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2071
2072 /*
2073 * Userspace mount programs that send binary options generally send
2074 * them populated with default values. We have no way to know which
2075 * ones were explicitly specified. Fall back to legacy behavior and
2076 * just return success.
2077 */
31c94469
MZ		 2078 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2079 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2080 options->version <= 6))))
48b605f8
JL		 2081 return 0;
2082
2083 data = kzalloc(sizeof(*data), GFP_KERNEL);
2084 if (data == NULL)
2085 return -ENOMEM;
2086
2087 /* fill out struct with values from existing mount */
2088 data->flags = nfss->flags;
2089 data->rsize = nfss->rsize;
2090 data->wsize = nfss->wsize;
2091 data->retrans = nfss->client->cl_timeout->to_retries;
2092 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2093 data->acregmin = nfss->acregmin / HZ;
2094 data->acregmax = nfss->acregmax / HZ;
2095 data->acdirmin = nfss->acdirmin / HZ;
2096 data->acdirmax = nfss->acdirmax / HZ;
2097 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2098 data->nfs_server.port = nfss->port;
48b605f8
JL		 2099 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2100 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2101 data->nfs_server.addrlen);
2102
2103 /* overwrite those values with any that were specified */
2104 error = nfs_parse_mount_options((char *)options, data);
2105 if (error < 0)
2106 goto out;
2107
2108 /* compare new mount options with old ones */
2109 error = nfs_compare_remount_data(nfss, data);
2110out:
2111 kfree(data);
2112 return error;
2113}
2114
f7b422b1 2115/*
54ceac45 2116 * Initialise the common bits of the superblock
f7b422b1 2117 */
54ceac45 2118static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2119{
54ceac45 2120 struct nfs_server *server = NFS_SB(sb);
5006a76c 2121
54ceac45 2122 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2123
54ceac45
DH		 2124 /* We probably want something more informative here */
2125 snprintf(sb->s_id, sizeof(sb->s_id),
2126 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2127
54ceac45
DH		 2128 if (sb->s_blocksize == 0)
2129 sb->s_blocksize = nfs_block_bits(server->wsize,
2130 &sb->s_blocksize_bits);
f7b422b1 2131
54ceac45
DH		 2132 if (server->flags & NFS_MOUNT_NOAC)
2133 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 2134
32a88aa1
JA		 2135 sb->s_bdi = &server->backing_dev_info;
2136
54ceac45 2137 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2138}
2139
2140/*
54ceac45 2141 * Finish setting up an NFS2/3 superblock
f7b422b1 2142 */
2283f8d6
TT		 2143static void nfs_fill_super(struct super_block *sb,
2144 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2145{
2146 struct nfs_server *server = NFS_SB(sb);
5006a76c 2147
54ceac45
DH		 2148 sb->s_blocksize_bits = 0;
2149 sb->s_blocksize = 0;
2150 if (data->bsize)
2151 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2152
8a6e5deb 2153 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2154 /* The VFS shouldn't apply the umask to mode bits. We will do
2155 * so ourselves when necessary.
2156 */
2157 sb->s_flags |= MS_POSIXACL;
2158 sb->s_time_gran = 1;
816724e6 2159 }
54ceac45
DH		 2160
2161 sb->s_op = &nfs_sops;
2162 nfs_initialise_sb(sb);
f7b422b1
DH		 2163}
2164
2165/*
54ceac45 2166 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2167 */
54ceac45
DH		 2168static void nfs_clone_super(struct super_block *sb,
2169 const struct super_block *old_sb)
f7b422b1 2170{
54ceac45
DH		 2171 struct nfs_server *server = NFS_SB(sb);
2172
2173 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2174 sb->s_blocksize = old_sb->s_blocksize;
2175 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2176
8a6e5deb 2177 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2178 /* The VFS shouldn't apply the umask to mode bits. We will do
2179 * so ourselves when necessary.
f7b422b1
DH		 2180 */
2181 sb->s_flags |= MS_POSIXACL;
f7b422b1 2182 sb->s_time_gran = 1;
f7b422b1
DH		 2183 }
2184
54ceac45
DH		 2185 sb->s_op = old_sb->s_op;
2186 nfs_initialise_sb(sb);
f7b422b1
DH		 2187}
2188
275a5d24
TM		 2189static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2190{
2191 const struct nfs_server *a = s->s_fs_info;
2192 const struct rpc_clnt *clnt_a = a->client;
2193 const struct rpc_clnt *clnt_b = b->client;
2194
2195 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2196 goto Ebusy;
2197 if (a->nfs_client != b->nfs_client)
2198 goto Ebusy;
2199 if (a->flags != b->flags)
2200 goto Ebusy;
2201 if (a->wsize != b->wsize)
2202 goto Ebusy;
2203 if (a->rsize != b->rsize)
2204 goto Ebusy;
2205 if (a->acregmin != b->acregmin)
2206 goto Ebusy;
2207 if (a->acregmax != b->acregmax)
2208 goto Ebusy;
2209 if (a->acdirmin != b->acdirmin)
2210 goto Ebusy;
2211 if (a->acdirmax != b->acdirmax)
2212 goto Ebusy;
2213 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2214 goto Ebusy;
e89a5a43 2215 return 1;
275a5d24 2216Ebusy:
e89a5a43
TM		 2217 return 0;
2218}
2219
2220struct nfs_sb_mountdata {
2221 struct nfs_server *server;
2222 int mntflags;
2223};
2224
2225static int nfs_set_super(struct super_block *s, void *data)
2226{
2227 struct nfs_sb_mountdata *sb_mntdata = data;
2228 struct nfs_server *server = sb_mntdata->server;
2229 int ret;
2230
2231 s->s_flags = sb_mntdata->mntflags;
2232 s->s_fs_info = server;
8b244ff2 2233 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2234 ret = set_anon_super(s, server);
2235 if (ret == 0)
2236 server->s_dev = s->s_dev;
2237 return ret;
2238}
2239
fd00a8ff
CL		 2240static int nfs_compare_super_address(struct nfs_server *server1,
2241 struct nfs_server *server2)
2242{
2243 struct sockaddr *sap1, *sap2;
2244
2245 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2246 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2247
2248 if (sap1->sa_family != sap2->sa_family)
2249 return 0;
2250
2251 switch (sap1->sa_family) {
2252 case AF_INET: {
2253 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2254 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2255 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2256 return 0;
2257 if (sin1->sin_port != sin2->sin_port)
2258 return 0;
2259 break;
2260 }
2261 case AF_INET6: {
2262 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2263 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2264 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2265 return 0;
2266 if (sin1->sin6_port != sin2->sin6_port)
2267 return 0;
2268 break;
2269 }
2270 default:
2271 return 0;
2272 }
2273
2274 return 1;
2275}
2276
e89a5a43
TM		 2277static int nfs_compare_super(struct super_block *sb, void *data)
2278{
2279 struct nfs_sb_mountdata *sb_mntdata = data;
2280 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2281 int mntflags = sb_mntdata->mntflags;
2282
fd00a8ff 2283 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2284 return 0;
2285 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2286 if (old->flags & NFS_MOUNT_UNSHARED)
2287 return 0;
2288 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2289 return 0;
2290 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2291}
2292
fa799759
MS		 2293static int nfs_bdi_register(struct nfs_server *server)
2294{
2295 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2296}
2297
816724e6
TM		 2298static int nfs_get_sb(struct file_system_type *fs_type,
2299 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2300{
f7b422b1
DH		 2301 struct nfs_server *server = NULL;
2302 struct super_block *s;
33852a1f
TM		 2303 struct nfs_parsed_mount_data *data;
2304 struct nfs_fh *mntfh;
54ceac45 2305 struct dentry *mntroot;
75180df2 2306 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2307 struct nfs_sb_mountdata sb_mntdata = {
2308 .mntflags = flags,
2309 };
33852a1f
TM		 2310 int error = -ENOMEM;
2311
1e657bd5 2312 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2313 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2314 if (data == NULL || mntfh == NULL)
2315 goto out_free_fh;
f7b422b1 2316
33852a1f 2317 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2318
54ceac45 2319 /* Validate the mount data */
33852a1f 2320 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2321 if (error < 0)
0655960f 2322 goto out;
f7b422b1 2323
764302cc
CL		 2324#ifdef CONFIG_NFS_V4
2325 if (data->version == 4) {
2326 error = nfs4_try_mount(flags, dev_name, data, mnt);
2327 kfree(data->client_address);
9699eda6 2328 kfree(data->nfs_server.export_path);
764302cc
CL		 2329 goto out;
2330 }
2331#endif /* CONFIG_NFS_V4 */
2332
54ceac45 2333 /* Get a volume representation */
33852a1f 2334 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2335 if (IS_ERR(server)) {
2336 error = PTR_ERR(server);
0655960f 2337 goto out;
f7b422b1 2338 }
e89a5a43 2339 sb_mntdata.server = server;
f7b422b1 2340
75180df2
TM		 2341 if (server->flags & NFS_MOUNT_UNSHARED)
2342 compare_super = NULL;
2343
54ceac45 2344 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2345 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2346 if (IS_ERR(s)) {
2347 error = PTR_ERR(s);
54ceac45 2348 goto out_err_nosb;
816724e6
TM		 2349 }
2350
54ceac45
DH		 2351 if (s->s_fs_info != server) {
2352 nfs_free_server(server);
2353 server = NULL;
fa799759
MS		 2354 } else {
2355 error = nfs_bdi_register(server);
2356 if (error)
cfbc0683 2357 goto error_splat_bdi;
54ceac45 2358 }
f7b422b1 2359
54ceac45
DH		 2360 if (!s->s_root) {
2361 /* initial superblock/root creation */
33852a1f 2362 nfs_fill_super(s, data);
2df54806
DH		 2363 nfs_fscache_get_super_cookie(
2364 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2365 }
f7b422b1 2366
0d5839ad 2367 mntroot = nfs_get_root(s, mntfh, dev_name);
54ceac45
DH		 2368 if (IS_ERR(mntroot)) {
2369 error = PTR_ERR(mntroot);
2370 goto error_splat_super;
f7b422b1 2371 }
816724e6 2372
33852a1f 2373 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2374 if (error)
2375 goto error_splat_root;
2376
54ceac45
DH		 2377 s->s_flags |= MS_ACTIVE;
2378 mnt->mnt_sb = s;
2379 mnt->mnt_root = mntroot;
0655960f
CL		 2380 error = 0;
2381
2382out:
33852a1f
TM		 2383 kfree(data->nfs_server.hostname);
2384 kfree(data->mount_server.hostname);
08734048 2385 kfree(data->fscache_uniq);
33852a1f
TM		 2386 security_free_mnt_opts(&data->lsm_opts);
2387out_free_fh:
b157b06c 2388 nfs_free_fhandle(mntfh);
33852a1f 2389 kfree(data);
0655960f 2390 return error;
816724e6 2391
54ceac45
DH		 2392out_err_nosb:
2393 nfs_free_server(server);
0655960f 2394 goto out;
54ceac45 2395
f9c3a380
EP		 2396error_splat_root:
2397 dput(mntroot);
54ceac45 2398error_splat_super:
cfbc0683
N		 2399 if (server && !s->s_root)
2400 bdi_unregister(&server->backing_dev_info);
2401error_splat_bdi:
6f5bbff9 2402 deactivate_locked_super(s);
0655960f 2403 goto out;
f7b422b1
DH		 2404}
2405
387c149b
TM		 2406/*
2407 * Ensure that we unregister the bdi before kill_anon_super
2408 * releases the device name
2409 */
2410static void nfs_put_super(struct super_block *s)
2411{
2412 struct nfs_server *server = NFS_SB(s);
2413
2414 bdi_unregister(&server->backing_dev_info);
2415}
2416
54ceac45
DH		 2417/*
2418 * Destroy an NFS2/3 superblock
2419 */
f7b422b1
DH		 2420static void nfs_kill_super(struct super_block *s)
2421{
2422 struct nfs_server *server = NFS_SB(s);
2423
2424 kill_anon_super(s);
08734048 2425 nfs_fscache_release_super_cookie(s);
54ceac45 2426 nfs_free_server(server);
f7b422b1
DH		 2427}
2428
54ceac45
DH		 2429/*
2430 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2431 */
31f43471
AV		 2432static struct dentry *
2433nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2434 const char *dev_name, void *raw_data)
f7b422b1
DH		 2435{
2436 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2437 struct super_block *s;
2438 struct nfs_server *server;
2439 struct dentry *mntroot;
75180df2 2440 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2441 struct nfs_sb_mountdata sb_mntdata = {
2442 .mntflags = flags,
2443 };
54ceac45 2444 int error;
f7b422b1 2445
31f43471 2446 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2447
54ceac45
DH		 2448 /* create a new volume representation */
2449 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2450 if (IS_ERR(server)) {
2451 error = PTR_ERR(server);
2452 goto out_err_noserver;
2453 }
e89a5a43 2454 sb_mntdata.server = server;
8fa5c000 2455
75180df2
TM		 2456 if (server->flags & NFS_MOUNT_UNSHARED)
2457 compare_super = NULL;
2458
54ceac45 2459 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2460 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2461 if (IS_ERR(s)) {
2462 error = PTR_ERR(s);
2463 goto out_err_nosb;
2464 }
5006a76c 2465
54ceac45
DH		 2466 if (s->s_fs_info != server) {
2467 nfs_free_server(server);
2468 server = NULL;
fa799759
MS		 2469 } else {
2470 error = nfs_bdi_register(server);
2471 if (error)
cfbc0683 2472 goto error_splat_bdi;
f7b422b1 2473 }
24c8dbbb 2474
54ceac45
DH		 2475 if (!s->s_root) {
2476 /* initial superblock/root creation */
54ceac45 2477 nfs_clone_super(s, data->sb);
2df54806 2478 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2479 }
f7b422b1 2480
0d5839ad 2481 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2482 if (IS_ERR(mntroot)) {
2483 error = PTR_ERR(mntroot);
2484 goto error_splat_super;
f7b422b1 2485 }
e9cc6c23 2486 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2487 dput(mntroot);
2488 error = -ESTALE;
2489 goto error_splat_super;
2490 }
f7b422b1 2491
54ceac45 2492 s->s_flags |= MS_ACTIVE;
f7b422b1 2493
f9c3a380
EP		 2494 /* clone any lsm security options from the parent to the new sb */
2495 security_sb_clone_mnt_opts(data->sb, s);
2496
31f43471
AV		 2497 dprintk("<-- nfs_xdev_mount() = 0\n");
2498 return mntroot;
24c8dbbb 2499
54ceac45
DH		 2500out_err_nosb:
2501 nfs_free_server(server);
2502out_err_noserver:
31f43471
AV		 2503 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2504 return ERR_PTR(error);
f7b422b1 2505
54ceac45 2506error_splat_super:
cfbc0683
N		 2507 if (server && !s->s_root)
2508 bdi_unregister(&server->backing_dev_info);
2509error_splat_bdi:
6f5bbff9 2510 deactivate_locked_super(s);
31f43471
AV		 2511 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2512 return ERR_PTR(error);
f7b422b1
DH		 2513}
2514
54ceac45
DH		 2515#ifdef CONFIG_NFS_V4
2516
f7b422b1 2517/*
54ceac45 2518 * Finish setting up a cloned NFS4 superblock
f7b422b1 2519 */
54ceac45
DH		 2520static void nfs4_clone_super(struct super_block *sb,
2521 const struct super_block *old_sb)
f7b422b1 2522{
54ceac45
DH		 2523 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2524 sb->s_blocksize = old_sb->s_blocksize;
2525 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2526 sb->s_time_gran = 1;
54ceac45 2527 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2528 /*
2529 * The VFS shouldn't apply the umask to mode bits. We will do
2530 * so ourselves when necessary.
2531 */
2532 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2533 sb->s_xattr = old_sb->s_xattr;
2534 nfs_initialise_sb(sb);
f7b422b1
DH		 2535}
2536
54ceac45
DH		 2537/*
2538 * Set up an NFS4 superblock
2539 */
2540static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2541{
54ceac45
DH		 2542 sb->s_time_gran = 1;
2543 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2544 /*
2545 * The VFS shouldn't apply the umask to mode bits. We will do
2546 * so ourselves when necessary.
2547 */
2548 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2549 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2550 nfs_initialise_sb(sb);
f7b422b1
DH		 2551}
2552
01c3f052
TM		 2553static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2554{
5eebde23
SJ		 2555 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2556 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2557}
2558
7630c852
CL		 2559static int nfs4_validate_text_mount_data(void *options,
2560 struct nfs_parsed_mount_data *args,
2561 const char *dev_name)
2562{
2563 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2564
f5855fec 2565 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2566
2567 nfs_validate_transport_protocol(args);
2568
2569 nfs4_validate_mount_flags(args);
2570
2ecda72b
TM		 2571 if (args->version != 4) {
2572 dfprintk(MOUNT,
2573 "NFS4: Illegal mount version\n");
2574 return -EINVAL;
2575 }
2576
7630c852
CL		 2577 if (args->auth_flavor_len > 1) {
2578 dfprintk(MOUNT,
2579 "NFS4: Too many RPC auth flavours specified\n");
2580 return -EINVAL;
2581 }
2582
2583 if (args->client_address == NULL) {
2584 dfprintk(MOUNT,
2585 "NFS4: mount program didn't pass callback address\n");
2586 return -EINVAL;
2587 }
2588
2589 return nfs_parse_devname(dev_name,
2590 &args->nfs_server.hostname,
2591 NFS4_MAXNAMLEN,
2592 &args->nfs_server.export_path,
2593 NFS4_MAXPATHLEN);
2594}
2595
f0768ebd
CL		 2596/*
2597 * Validate NFSv4 mount options
2598 */
91ea40b9
TT		 2599static int nfs4_validate_mount_data(void *options,
2600 struct nfs_parsed_mount_data *args,
2601 const char *dev_name)
f0768ebd 2602{
4cfd74fc 2603 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2604 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2605 char *c;
2606
2607 if (data == NULL)
2608 goto out_no_data;
2609
2610 switch (data->version) {
2611 case 1:
4c568017
CL		 2612 if (data->host_addrlen > sizeof(args->nfs_server.address))
2613 goto out_no_address;
2614 if (data->host_addrlen == 0)
f0768ebd 2615 goto out_no_address;
4c568017 2616 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2617 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2618 return -EFAULT;
4cfd74fc 2619 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2620 goto out_no_address;
2621
6738b251
CL		 2622 if (data->auth_flavourlen) {
2623 if (data->auth_flavourlen > 1)
2624 goto out_inval_auth;
20c71f5e 2625 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2626 data->auth_flavours,
20c71f5e 2627 sizeof(args->auth_flavors[0])))
f0768ebd 2628 return -EFAULT;
f0768ebd
CL		 2629 }
2630
2631 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2632 if (IS_ERR(c))
2633 return PTR_ERR(c);
91ea40b9 2634 args->nfs_server.hostname = c;
f0768ebd
CL		 2635
2636 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2637 if (IS_ERR(c))
2638 return PTR_ERR(c);
91ea40b9
TT		 2639 args->nfs_server.export_path = c;
2640 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2641
2642 c = strndup_user(data->client_addr.data, 16);
2643 if (IS_ERR(c))
2644 return PTR_ERR(c);
91ea40b9
TT		 2645 args->client_address = c;
2646
2647 /*
2648 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2649 * can deal with.
2650 */
2651
2652 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2653 args->rsize = data->rsize;
2654 args->wsize = data->wsize;
2655 args->timeo = data->timeo;
2656 args->retrans = data->retrans;
2657 args->acregmin = data->acregmin;
2658 args->acregmax = data->acregmax;
2659 args->acdirmin = data->acdirmin;
2660 args->acdirmax = data->acdirmax;
2661 args->nfs_server.protocol = data->proto;
259875ef 2662 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2663
2664 break;
7630c852 2665 default:
91ea40b9 2666 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2667 return -EINVAL;
2668
4cfd74fc 2669 if (!nfs_verify_server_address(sap))
80071225 2670 return -EINVAL;
dc045898 2671
7630c852 2672 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2673 }
2674
2675 return 0;
2676
2677out_no_data:
2678 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2679 return -EINVAL;
2680
2681out_inval_auth:
2682 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2683 data->auth_flavourlen);
2684 return -EINVAL;
2685
2686out_no_address:
2687 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2688 return -EINVAL;
f0768ebd
CL		 2689}
2690
54ceac45 2691/*
c02d7adf 2692 * Get the superblock for the NFS4 root partition
54ceac45 2693 */
31f43471
AV		 2694static struct dentry *
2695nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2696 const char *dev_name, void *raw_data)
f7b422b1 2697{
c02d7adf 2698 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2699 struct super_block *s;
2700 struct nfs_server *server;
33852a1f 2701 struct nfs_fh *mntfh;
54ceac45 2702 struct dentry *mntroot;
75180df2 2703 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2704 struct nfs_sb_mountdata sb_mntdata = {
2705 .mntflags = flags,
2706 };
33852a1f
TM		 2707 int error = -ENOMEM;
2708
b157b06c 2709 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2710 if (data == NULL || mntfh == NULL)
2711 goto out_free_fh;
f7b422b1 2712
33852a1f 2713 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2714
54ceac45 2715 /* Get a volume representation */
33852a1f 2716 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2717 if (IS_ERR(server)) {
2718 error = PTR_ERR(server);
29eb981a 2719 goto out;
f7b422b1 2720 }
e89a5a43 2721 sb_mntdata.server = server;
f7b422b1 2722
75180df2
TM		 2723 if (server->flags & NFS4_MOUNT_UNSHARED)
2724 compare_super = NULL;
2725
54ceac45 2726 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2727 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2728 if (IS_ERR(s)) {
2729 error = PTR_ERR(s);
f7b422b1 2730 goto out_free;
816724e6
TM		 2731 }
2732
5dd3177a
TM		 2733 if (s->s_fs_info != server) {
2734 nfs_free_server(server);
2735 server = NULL;
fa799759
MS		 2736 } else {
2737 error = nfs_bdi_register(server);
2738 if (error)
cfbc0683 2739 goto error_splat_bdi;
5dd3177a
TM		 2740 }
2741
54ceac45
DH		 2742 if (!s->s_root) {
2743 /* initial superblock/root creation */
54ceac45 2744 nfs4_fill_super(s);
2df54806
DH		 2745 nfs_fscache_get_super_cookie(
2746 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2747 }
f7b422b1 2748
0d5839ad 2749 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2750 if (IS_ERR(mntroot)) {
2751 error = PTR_ERR(mntroot);
2752 goto error_splat_super;
f7b422b1 2753 }
54ceac45 2754
33852a1f 2755 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2756 if (error)
2757 goto error_splat_root;
2758
f7b422b1 2759 s->s_flags |= MS_ACTIVE;
31f43471
AV		 2760
2761 security_free_mnt_opts(&data->lsm_opts);
2762 nfs_free_fhandle(mntfh);
2763 return mntroot;
29eb981a
CL		 2764
2765out:
33852a1f
TM		 2766 security_free_mnt_opts(&data->lsm_opts);
2767out_free_fh:
b157b06c 2768 nfs_free_fhandle(mntfh);
31f43471 2769 return ERR_PTR(error);
54ceac45 2770
f7b422b1 2771out_free:
54ceac45 2772 nfs_free_server(server);
29eb981a 2773 goto out;
54ceac45 2774
46c8ac74
EP		 2775error_splat_root:
2776 dput(mntroot);
54ceac45 2777error_splat_super:
cfbc0683
N		 2778 if (server && !s->s_root)
2779 bdi_unregister(&server->backing_dev_info);
2780error_splat_bdi:
6f5bbff9 2781 deactivate_locked_super(s);
29eb981a 2782 goto out;
f7b422b1
DH		 2783}
2784
c02d7adf
TM		 2785static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2786 int flags, void *data, const char *hostname)
2787{
2788 struct vfsmount *root_mnt;
2789 char *root_devname;
2790 size_t len;
2791
2792 len = strlen(hostname) + 3;
2793 root_devname = kmalloc(len, GFP_KERNEL);
2794 if (root_devname == NULL)
2795 return ERR_PTR(-ENOMEM);
2796 snprintf(root_devname, len, "%s:/", hostname);
2797 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2798 kfree(root_devname);
2799 return root_mnt;
2800}
2801
ce587e07
TM		 2802struct nfs_referral_count {
2803 struct list_head list;
2804 const struct task_struct *task;
2805 unsigned int referral_count;
2806};
2807
2808static LIST_HEAD(nfs_referral_count_list);
2809static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2810
2811static struct nfs_referral_count *nfs_find_referral_count(void)
2812{
2813 struct nfs_referral_count *p;
2814
2815 list_for_each_entry(p, &nfs_referral_count_list, list) {
2816 if (p->task == current)
2817 return p;
2818 }
2819 return NULL;
2820}
2821
2822#define NFS_MAX_NESTED_REFERRALS 2
2823
2824static int nfs_referral_loop_protect(void)
2825{
2826 struct nfs_referral_count *p, *new;
2827 int ret = -ENOMEM;
2828
2829 new = kmalloc(sizeof(*new), GFP_KERNEL);
2830 if (!new)
2831 goto out;
2832 new->task = current;
2833 new->referral_count = 1;
2834
2835 ret = 0;
2836 spin_lock(&nfs_referral_count_list_lock);
2837 p = nfs_find_referral_count();
2838 if (p != NULL) {
2839 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2840 ret = -ELOOP;
2841 else
2842 p->referral_count++;
2843 } else {
2844 list_add(&new->list, &nfs_referral_count_list);
2845 new = NULL;
2846 }
2847 spin_unlock(&nfs_referral_count_list_lock);
2848 kfree(new);
2849out:
2850 return ret;
2851}
2852
2853static void nfs_referral_loop_unprotect(void)
2854{
2855 struct nfs_referral_count *p;
2856
2857 spin_lock(&nfs_referral_count_list_lock);
2858 p = nfs_find_referral_count();
2859 p->referral_count--;
2860 if (p->referral_count == 0)
2861 list_del(&p->list);
2862 else
2863 p = NULL;
2864 spin_unlock(&nfs_referral_count_list_lock);
2865 kfree(p);
2866}
2867
c02d7adf
TM		 2868static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2869 const char *export_path, struct vfsmount *mnt_target)
2870{
04ffdbe2 2871 struct nameidata *nd = NULL;
a2770d86 2872 struct mnt_namespace *ns_private;
c02d7adf
TM		 2873 struct super_block *s;
2874 int ret;
2875
04ffdbe2
TM		 2876 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2877 if (nd == NULL)
2878 return -ENOMEM;
2879
a2770d86
LT		 2880 ns_private = create_mnt_ns(root_mnt);
2881 ret = PTR_ERR(ns_private);
2882 if (IS_ERR(ns_private))
2883 goto out_mntput;
2884
ce587e07
TM		 2885 ret = nfs_referral_loop_protect();
2886 if (ret != 0)
2887 goto out_put_mnt_ns;
2888
c02d7adf 2889 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
04ffdbe2 2890 export_path, LOOKUP_FOLLOW, nd);
c02d7adf 2891
ce587e07 2892 nfs_referral_loop_unprotect();
a2770d86
LT		 2893 put_mnt_ns(ns_private);
2894
c02d7adf
TM		 2895 if (ret != 0)
2896 goto out_err;
2897
04ffdbe2 2898 s = nd->path.mnt->mnt_sb;
c02d7adf
TM		 2899 atomic_inc(&s->s_active);
2900 mnt_target->mnt_sb = s;
04ffdbe2 2901 mnt_target->mnt_root = dget(nd->path.dentry);
c02d7adf 2902
04ffdbe2
TM		 2903 path_put(&nd->path);
2904 kfree(nd);
c02d7adf
TM		 2905 down_write(&s->s_umount);
2906 return 0;
ce587e07
TM		 2907out_put_mnt_ns:
2908 put_mnt_ns(ns_private);
c02d7adf
TM		 2909out_mntput:
2910 mntput(root_mnt);
2911out_err:
04ffdbe2 2912 kfree(nd);
c02d7adf
TM		 2913 return ret;
2914}
2915
a6fe23be
CL		 2916static int nfs4_try_mount(int flags, const char *dev_name,
2917 struct nfs_parsed_mount_data *data,
2918 struct vfsmount *mnt)
2919{
2920 char *export_path;
2921 struct vfsmount *root_mnt;
2922 int error;
2923
2924 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2925
2926 export_path = data->nfs_server.export_path;
2927 data->nfs_server.export_path = "/";
2928 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2929 data->nfs_server.hostname);
2930 data->nfs_server.export_path = export_path;
2931
2932 error = PTR_ERR(root_mnt);
2933 if (IS_ERR(root_mnt))
2934 goto out;
2935
2936 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2937
2938out:
2939 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2940 error != 0 ? " [error]" : "");
2941 return error;
2942}
2943
c02d7adf
TM		 2944/*
2945 * Get the superblock for an NFS4 mountpoint
2946 */
2947static int nfs4_get_sb(struct file_system_type *fs_type,
2948 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2949{
2950 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2951 int error = -ENOMEM;
2952
c5811dbd 2953 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2954 if (data == NULL)
2955 goto out_free_data;
2956
2957 /* Validate the mount data */
2958 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2959 if (error < 0)
2960 goto out;
2961
a6fe23be 2962 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2963
2964out:
2965 kfree(data->client_address);
2966 kfree(data->nfs_server.export_path);
2967 kfree(data->nfs_server.hostname);
2968 kfree(data->fscache_uniq);
2969out_free_data:
2970 kfree(data);
2971 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2972 error != 0 ? " [error]" : "");
2973 return error;
2974}
2975
f7b422b1
DH		 2976static void nfs4_kill_super(struct super_block *sb)
2977{
2978 struct nfs_server *server = NFS_SB(sb);
2979
0f3e66c6 2980 dprintk("--> %s\n", __func__);
515d8611 2981 nfs_super_return_all_delegations(sb);
f7b422b1 2982 kill_anon_super(sb);
08734048 2983 nfs_fscache_release_super_cookie(sb);
54ceac45 2984 nfs_free_server(server);
0f3e66c6 2985 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2986}
2987
2988/*
54ceac45 2989 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2990 */
31f43471
AV		 2991static struct dentry *
2992nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2993 const char *dev_name, void *raw_data)
f7b422b1 2994{
54ceac45
DH		 2995 struct nfs_clone_mount *data = raw_data;
2996 struct super_block *s;
2997 struct nfs_server *server;
2998 struct dentry *mntroot;
75180df2 2999 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 3000 struct nfs_sb_mountdata sb_mntdata = {
3001 .mntflags = flags,
3002 };
54ceac45 3003 int error;
f7b422b1 3004
31f43471 3005 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 3006
54ceac45
DH		 3007 /* create a new volume representation */
3008 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
3009 if (IS_ERR(server)) {
3010 error = PTR_ERR(server);
3011 goto out_err_noserver;
f7b422b1 3012 }
e89a5a43 3013 sb_mntdata.server = server;
f7b422b1 3014
75180df2
TM		 3015 if (server->flags & NFS4_MOUNT_UNSHARED)
3016 compare_super = NULL;
3017
54ceac45 3018 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3019 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3020 if (IS_ERR(s)) {
3021 error = PTR_ERR(s);
3022 goto out_err_nosb;
f7b422b1 3023 }
f7b422b1 3024
54ceac45
DH		 3025 if (s->s_fs_info != server) {
3026 nfs_free_server(server);
3027 server = NULL;
fa799759
MS		 3028 } else {
3029 error = nfs_bdi_register(server);
3030 if (error)
cfbc0683 3031 goto error_splat_bdi;
54ceac45 3032 }
f7b422b1 3033
54ceac45
DH		 3034 if (!s->s_root) {
3035 /* initial superblock/root creation */
54ceac45 3036 nfs4_clone_super(s, data->sb);
2df54806 3037 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 3038 }
f7b422b1 3039
0d5839ad 3040 mntroot = nfs4_get_root(s, data->fh, dev_name);
54ceac45
DH		 3041 if (IS_ERR(mntroot)) {
3042 error = PTR_ERR(mntroot);
3043 goto error_splat_super;
3044 }
e9cc6c23
TM		 3045 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3046 dput(mntroot);
3047 error = -ESTALE;
3048 goto error_splat_super;
3049 }
f7b422b1 3050
54ceac45 3051 s->s_flags |= MS_ACTIVE;
54ceac45 3052
46c8ac74
EP		 3053 security_sb_clone_mnt_opts(data->sb, s);
3054
31f43471
AV		 3055 dprintk("<-- nfs4_xdev_mount() = 0\n");
3056 return mntroot;
54ceac45
DH		 3057
3058out_err_nosb:
3059 nfs_free_server(server);
3060out_err_noserver:
31f43471
AV		 3061 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3062 return ERR_PTR(error);
54ceac45
DH		 3063
3064error_splat_super:
cfbc0683
N		 3065 if (server && !s->s_root)
3066 bdi_unregister(&server->backing_dev_info);
3067error_splat_bdi:
6f5bbff9 3068 deactivate_locked_super(s);
31f43471
AV		 3069 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3070 return ERR_PTR(error);
f7b422b1
DH		 3071}
3072
31f43471
AV		 3073static struct dentry *
3074nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3075 const char *dev_name, void *raw_data)
f7b422b1
DH		 3076{
3077 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 3078 struct super_block *s;
3079 struct nfs_server *server;
3080 struct dentry *mntroot;
4f727296 3081 struct nfs_fh *mntfh;
75180df2 3082 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 3083 struct nfs_sb_mountdata sb_mntdata = {
3084 .mntflags = flags,
3085 };
4f727296 3086 int error = -ENOMEM;
54ceac45
DH		 3087
3088 dprintk("--> nfs4_referral_get_sb()\n");
3089
4f727296
TM		 3090 mntfh = nfs_alloc_fhandle();
3091 if (mntfh == NULL)
3092 goto out_err_nofh;
3093
54ceac45 3094 /* create a new volume representation */
4f727296 3095 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3096 if (IS_ERR(server)) {
3097 error = PTR_ERR(server);
3098 goto out_err_noserver;
3099 }
e89a5a43 3100 sb_mntdata.server = server;
54ceac45 3101
75180df2
TM		 3102 if (server->flags & NFS4_MOUNT_UNSHARED)
3103 compare_super = NULL;
3104
54ceac45 3105 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3106 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3107 if (IS_ERR(s)) {
3108 error = PTR_ERR(s);
3109 goto out_err_nosb;
3110 }
3111
3112 if (s->s_fs_info != server) {
3113 nfs_free_server(server);
3114 server = NULL;
fa799759
MS		 3115 } else {
3116 error = nfs_bdi_register(server);
3117 if (error)
cfbc0683 3118 goto error_splat_bdi;
54ceac45
DH		 3119 }
3120
3121 if (!s->s_root) {
3122 /* initial superblock/root creation */
54ceac45 3123 nfs4_fill_super(s);
2df54806 3124 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3125 }
3126
0d5839ad 3127 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 3128 if (IS_ERR(mntroot)) {
3129 error = PTR_ERR(mntroot);
3130 goto error_splat_super;
3131 }
e9cc6c23
TM		 3132 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3133 dput(mntroot);
3134 error = -ESTALE;
3135 goto error_splat_super;
3136 }
54ceac45
DH		 3137
3138 s->s_flags |= MS_ACTIVE;
54ceac45 3139
46c8ac74
EP		 3140 security_sb_clone_mnt_opts(data->sb, s);
3141
4f727296 3142 nfs_free_fhandle(mntfh);
54ceac45 3143 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3144 return mntroot;
54ceac45
DH		 3145
3146out_err_nosb:
3147 nfs_free_server(server);
3148out_err_noserver:
4f727296
TM		 3149 nfs_free_fhandle(mntfh);
3150out_err_nofh:
54ceac45 3151 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3152 return ERR_PTR(error);
54ceac45
DH		 3153
3154error_splat_super:
cfbc0683
N		 3155 if (server && !s->s_root)
3156 bdi_unregister(&server->backing_dev_info);
3157error_splat_bdi:
6f5bbff9 3158 deactivate_locked_super(s);
4f727296 3159 nfs_free_fhandle(mntfh);
54ceac45 3160 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3161 return ERR_PTR(error);
f7b422b1
DH		 3162}
3163
c02d7adf
TM		 3164/*
3165 * Create an NFS4 server record on referral traversal
3166 */
3167static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3168 int flags, const char *dev_name, void *raw_data,
3169 struct vfsmount *mnt)
3170{
3171 struct nfs_clone_mount *data = raw_data;
3172 char *export_path;
3173 struct vfsmount *root_mnt;
3174 int error;
3175
3176 dprintk("--> nfs4_referral_get_sb()\n");
3177
3178 export_path = data->mnt_path;
3179 data->mnt_path = "/";
3180
3181 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3182 flags, data, data->hostname);
3183 data->mnt_path = export_path;
3184
3185 error = PTR_ERR(root_mnt);
3186 if (IS_ERR(root_mnt))
3187 goto out;
3188
3189 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3190out:
3191 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3192 error != 0 ? " [error]" : "");
3193 return error;
3194}
3195
54ceac45 3196#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)