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NFS: Define and create superblock-level objects
[deliverable/linux.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
42#include <linux/smp_lock.h>
43#include <linux/seq_file.h>
44#include <linux/mount.h>
45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff
CL		 48#include <linux/in6.h>
49#include <net/ipv6.h>
d8e7748a 50#include <linux/netdevice.h>
f7b422b1 51#include <linux/nfs_xdr.h>
b5d5dfbd 52#include <linux/magic.h>
bf0fd768 53#include <linux/parser.h>
f7b422b1
DH		 54
55#include <asm/system.h>
56#include <asm/uaccess.h>
57
58#include "nfs4_fs.h"
59#include "callback.h"
60#include "delegation.h"
61#include "iostat.h"
62#include "internal.h"
08734048 63#include "fscache.h"
f7b422b1
DH		 64
65#define NFSDBG_FACILITY NFSDBG_VFS
66
bf0fd768
CL		 67enum {
68 /* Mount options that take no arguments */
69 Opt_soft, Opt_hard,
bf0fd768
CL		 70 Opt_posix, Opt_noposix,
71 Opt_cto, Opt_nocto,
72 Opt_ac, Opt_noac,
73 Opt_lock, Opt_nolock,
74 Opt_v2, Opt_v3,
2cf7ff7a 75 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 76 Opt_acl, Opt_noacl,
77 Opt_rdirplus, Opt_nordirplus,
75180df2 78 Opt_sharecache, Opt_nosharecache,
d740351b 79 Opt_resvport, Opt_noresvport,
bf0fd768
CL		 80
81 /* Mount options that take integer arguments */
82 Opt_port,
83 Opt_rsize, Opt_wsize, Opt_bsize,
84 Opt_timeo, Opt_retrans,
85 Opt_acregmin, Opt_acregmax,
86 Opt_acdirmin, Opt_acdirmax,
87 Opt_actimeo,
88 Opt_namelen,
89 Opt_mountport,
e887cbcf 90 Opt_mountvers,
ad879cef 91 Opt_nfsvers,
bf0fd768
CL		 92
93 /* Mount options that take string arguments */
33832034 94 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 95 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 96 Opt_lookupcache,
bf0fd768 97
f45663ce
CL		 98 /* Special mount options */
99 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 100
101 Opt_err
102};
103
a447c093 104static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 105 { Opt_userspace, "bg" },
106 { Opt_userspace, "fg" },
ecbb3845
CL		 107 { Opt_userspace, "retry=%s" },
108
f45663ce
CL		 109 { Opt_sloppy, "sloppy" },
110
bf0fd768
CL		 111 { Opt_soft, "soft" },
112 { Opt_hard, "hard" },
d33e4dfe
CL		 113 { Opt_deprecated, "intr" },
114 { Opt_deprecated, "nointr" },
bf0fd768
CL		 115 { Opt_posix, "posix" },
116 { Opt_noposix, "noposix" },
117 { Opt_cto, "cto" },
118 { Opt_nocto, "nocto" },
119 { Opt_ac, "ac" },
120 { Opt_noac, "noac" },
121 { Opt_lock, "lock" },
122 { Opt_nolock, "nolock" },
123 { Opt_v2, "v2" },
124 { Opt_v3, "v3" },
125 { Opt_udp, "udp" },
126 { Opt_tcp, "tcp" },
2cf7ff7a 127 { Opt_rdma, "rdma" },
bf0fd768
CL		 128 { Opt_acl, "acl" },
129 { Opt_noacl, "noacl" },
130 { Opt_rdirplus, "rdirplus" },
131 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 132 { Opt_sharecache, "sharecache" },
133 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 134 { Opt_resvport, "resvport" },
135 { Opt_noresvport, "noresvport" },
bf0fd768
CL		 136
137 { Opt_port, "port=%u" },
138 { Opt_rsize, "rsize=%u" },
139 { Opt_wsize, "wsize=%u" },
140 { Opt_bsize, "bsize=%u" },
141 { Opt_timeo, "timeo=%u" },
142 { Opt_retrans, "retrans=%u" },
143 { Opt_acregmin, "acregmin=%u" },
144 { Opt_acregmax, "acregmax=%u" },
145 { Opt_acdirmin, "acdirmin=%u" },
146 { Opt_acdirmax, "acdirmax=%u" },
147 { Opt_actimeo, "actimeo=%u" },
bf0fd768
CL		 148 { Opt_namelen, "namlen=%u" },
149 { Opt_mountport, "mountport=%u" },
bf0fd768 150 { Opt_mountvers, "mountvers=%u" },
bf0fd768
CL		 151 { Opt_nfsvers, "nfsvers=%u" },
152 { Opt_nfsvers, "vers=%u" },
153
154 { Opt_sec, "sec=%s" },
155 { Opt_proto, "proto=%s" },
156 { Opt_mountproto, "mountproto=%s" },
157 { Opt_addr, "addr=%s" },
158 { Opt_clientaddr, "clientaddr=%s" },
33832034 159 { Opt_mounthost, "mounthost=%s" },
0ac83779 160 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 161
7973c1f1
TM		 162 { Opt_lookupcache, "lookupcache=%s" },
163
bf0fd768
CL		 164 { Opt_err, NULL }
165};
166
167enum {
2cf7ff7a 168 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 169
170 Opt_xprt_err
171};
172
a447c093 173static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768
CL		 174 { Opt_xprt_udp, "udp" },
175 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 176 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 177
178 { Opt_xprt_err, NULL }
179};
180
181enum {
182 Opt_sec_none, Opt_sec_sys,
183 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
184 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
185 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
186
187 Opt_sec_err
188};
189
a447c093 190static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 191 { Opt_sec_none, "none" },
192 { Opt_sec_none, "null" },
193 { Opt_sec_sys, "sys" },
194
195 { Opt_sec_krb5, "krb5" },
196 { Opt_sec_krb5i, "krb5i" },
197 { Opt_sec_krb5p, "krb5p" },
198
199 { Opt_sec_lkey, "lkey" },
200 { Opt_sec_lkeyi, "lkeyi" },
201 { Opt_sec_lkeyp, "lkeyp" },
202
8d042218
OK		 203 { Opt_sec_spkm, "spkm3" },
204 { Opt_sec_spkmi, "spkm3i" },
205 { Opt_sec_spkmp, "spkm3p" },
206
bf0fd768
CL		 207 { Opt_sec_err, NULL }
208};
209
7973c1f1
TM		 210enum {
211 Opt_lookupcache_all, Opt_lookupcache_positive,
212 Opt_lookupcache_none,
213
214 Opt_lookupcache_err
215};
216
217static match_table_t nfs_lookupcache_tokens = {
218 { Opt_lookupcache_all, "all" },
219 { Opt_lookupcache_positive, "pos" },
220 { Opt_lookupcache_positive, "positive" },
221 { Opt_lookupcache_none, "none" },
222
223 { Opt_lookupcache_err, NULL }
224};
225
bf0fd768 226
42faad99 227static void nfs_umount_begin(struct super_block *);
816724e6 228static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 229static int nfs_show_options(struct seq_file *, struct vfsmount *);
230static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 231static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 232static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 233 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1 234static void nfs_kill_super(struct super_block *);
48b605f8 235static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 236
237static struct file_system_type nfs_fs_type = {
238 .owner = THIS_MODULE,
239 .name = "nfs",
240 .get_sb = nfs_get_sb,
241 .kill_sb = nfs_kill_super,
349457cc 242 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 243};
244
54ceac45 245struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 246 .owner = THIS_MODULE,
247 .name = "nfs",
54ceac45 248 .get_sb = nfs_xdev_get_sb,
f7b422b1 249 .kill_sb = nfs_kill_super,
349457cc 250 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 251};
252
ee9b6d61 253static const struct super_operations nfs_sops = {
f7b422b1
DH		 254 .alloc_inode = nfs_alloc_inode,
255 .destroy_inode = nfs_destroy_inode,
256 .write_inode = nfs_write_inode,
257 .statfs = nfs_statfs,
258 .clear_inode = nfs_clear_inode,
259 .umount_begin = nfs_umount_begin,
260 .show_options = nfs_show_options,
261 .show_stats = nfs_show_stats,
48b605f8 262 .remount_fs = nfs_remount,
f7b422b1
DH		 263};
264
265#ifdef CONFIG_NFS_V4
816724e6
TM		 266static int nfs4_get_sb(struct file_system_type *fs_type,
267 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 268static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
269 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
270static int nfs4_referral_get_sb(struct file_system_type *fs_type,
271 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 272static void nfs4_kill_super(struct super_block *sb);
273
274static struct file_system_type nfs4_fs_type = {
275 .owner = THIS_MODULE,
276 .name = "nfs4",
277 .get_sb = nfs4_get_sb,
278 .kill_sb = nfs4_kill_super,
349457cc 279 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 280};
281
54ceac45 282struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 283 .owner = THIS_MODULE,
284 .name = "nfs4",
54ceac45 285 .get_sb = nfs4_xdev_get_sb,
f7b422b1 286 .kill_sb = nfs4_kill_super,
349457cc 287 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 288};
289
54ceac45 290struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 291 .owner = THIS_MODULE,
292 .name = "nfs4",
54ceac45 293 .get_sb = nfs4_referral_get_sb,
f7b422b1 294 .kill_sb = nfs4_kill_super,
349457cc 295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 296};
297
ee9b6d61 298static const struct super_operations nfs4_sops = {
f7b422b1
DH		 299 .alloc_inode = nfs_alloc_inode,
300 .destroy_inode = nfs_destroy_inode,
301 .write_inode = nfs_write_inode,
302 .statfs = nfs_statfs,
303 .clear_inode = nfs4_clear_inode,
304 .umount_begin = nfs_umount_begin,
305 .show_options = nfs_show_options,
306 .show_stats = nfs_show_stats,
48b605f8 307 .remount_fs = nfs_remount,
f7b422b1
DH		 308};
309#endif
310
8e1f936b
RR		 311static struct shrinker acl_shrinker = {
312 .shrink = nfs_access_cache_shrinker,
313 .seeks = DEFAULT_SEEKS,
314};
979df72e 315
f7b422b1
DH		 316/*
317 * Register the NFS filesystems
318 */
319int __init register_nfs_fs(void)
320{
321 int ret;
322
323 ret = register_filesystem(&nfs_fs_type);
324 if (ret < 0)
325 goto error_0;
326
f7b422b1
DH		 327 ret = nfs_register_sysctl();
328 if (ret < 0)
329 goto error_1;
89a09141 330#ifdef CONFIG_NFS_V4
f7b422b1
DH		 331 ret = register_filesystem(&nfs4_fs_type);
332 if (ret < 0)
333 goto error_2;
334#endif
8e1f936b 335 register_shrinker(&acl_shrinker);
f7b422b1
DH		 336 return 0;
337
338#ifdef CONFIG_NFS_V4
339error_2:
340 nfs_unregister_sysctl();
89a09141 341#endif
f7b422b1
DH		 342error_1:
343 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 344error_0:
345 return ret;
346}
347
348/*
349 * Unregister the NFS filesystems
350 */
351void __exit unregister_nfs_fs(void)
352{
8e1f936b 353 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 354#ifdef CONFIG_NFS_V4
355 unregister_filesystem(&nfs4_fs_type);
f7b422b1 356#endif
49af7ee1 357 nfs_unregister_sysctl();
f7b422b1
DH		 358 unregister_filesystem(&nfs_fs_type);
359}
360
1daef0a8 361void nfs_sb_active(struct super_block *sb)
ef818a28 362{
1daef0a8 363 struct nfs_server *server = NFS_SB(sb);
ef818a28 364
1daef0a8
TM		 365 if (atomic_inc_return(&server->active) == 1)
366 atomic_inc(&sb->s_active);
ef818a28
SD		 367}
368
1daef0a8 369void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 370{
371 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 372
373 if (atomic_dec_and_test(&server->active))
374 deactivate_super(sb);
ef818a28
SD		 375}
376
f7b422b1
DH		 377/*
378 * Deliver file system statistics to userspace
379 */
816724e6 380static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 381{
0c7d90cf 382 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 383 unsigned char blockbits;
384 unsigned long blockres;
0c7d90cf 385 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 386 struct nfs_fattr fattr;
387 struct nfs_fsstat res = {
388 .fattr = &fattr,
389 };
390 int error;
391
8fa5c000 392 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 393 if (error < 0)
394 goto out_err;
1a0ba9ae 395 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 396
397 /*
398 * Current versions of glibc do not correctly handle the
399 * case where f_frsize != f_bsize. Eventually we want to
400 * report the value of wtmult in this field.
401 */
0c7d90cf 402 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 403
404 /*
405 * On most *nix systems, f_blocks, f_bfree, and f_bavail
406 * are reported in units of f_frsize. Linux hasn't had
407 * an f_frsize field in its statfs struct until recently,
408 * thus historically Linux's sys_statfs reports these
409 * fields in units of f_bsize.
410 */
0c7d90cf
DH		 411 buf->f_bsize = dentry->d_sb->s_blocksize;
412 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 413 blockres = (1 << blockbits) - 1;
414 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
415 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
416 buf->f_bavail = (res.abytes + blockres) >> blockbits;
417
418 buf->f_files = res.tfiles;
419 buf->f_ffree = res.afiles;
420
421 buf->f_namelen = server->namelen;
1a0ba9ae 422
f7b422b1
DH		 423 return 0;
424
425 out_err:
3110ff80 426 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 427 return error;
f7b422b1
DH		 428}
429
7d4e2747
DH		 430/*
431 * Map the security flavour number to a name
432 */
81039f1f
TM		 433static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
434{
7d4e2747 435 static const struct {
81039f1f
TM		 436 rpc_authflavor_t flavour;
437 const char *str;
438 } sec_flavours[] = {
439 { RPC_AUTH_NULL, "null" },
440 { RPC_AUTH_UNIX, "sys" },
441 { RPC_AUTH_GSS_KRB5, "krb5" },
442 { RPC_AUTH_GSS_KRB5I, "krb5i" },
443 { RPC_AUTH_GSS_KRB5P, "krb5p" },
444 { RPC_AUTH_GSS_LKEY, "lkey" },
445 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
446 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
447 { RPC_AUTH_GSS_SPKM, "spkm" },
448 { RPC_AUTH_GSS_SPKMI, "spkmi" },
449 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 450 { UINT_MAX, "unknown" }
81039f1f
TM		 451 };
452 int i;
453
4d81cd16 454 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 455 if (sec_flavours[i].flavour == flavour)
456 break;
457 }
458 return sec_flavours[i].str;
459}
460
82d101d5
CL		 461static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
462 int showdefaults)
463{
464 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
465
466 switch (sap->sa_family) {
467 case AF_INET: {
468 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 469 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 470 break;
471 }
472 case AF_INET6: {
473 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
5b095d98 474 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
82d101d5
CL		 475 break;
476 }
477 default:
478 if (showdefaults)
479 seq_printf(m, ",mountaddr=unspecified");
480 }
481
482 if (nfss->mountd_version || showdefaults)
483 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
484 if (nfss->mountd_port || showdefaults)
485 seq_printf(m, ",mountport=%u", nfss->mountd_port);
486
487 switch (nfss->mountd_protocol) {
488 case IPPROTO_UDP:
489 seq_printf(m, ",mountproto=udp");
490 break;
491 case IPPROTO_TCP:
492 seq_printf(m, ",mountproto=tcp");
493 break;
494 default:
495 if (showdefaults)
496 seq_printf(m, ",mountproto=auto");
497 }
498}
499
f7b422b1
DH		 500/*
501 * Describe the mount options in force on this server representation
502 */
82d101d5
CL		 503static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
504 int showdefaults)
f7b422b1 505{
509de811 506 static const struct proc_nfs_info {
f7b422b1 507 int flag;
509de811
DH		 508 const char *str;
509 const char *nostr;
f7b422b1
DH		 510 } nfs_info[] = {
511 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5
CL		 512 { NFS_MOUNT_INTR, ",intr", ",nointr" },
513 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 514 { NFS_MOUNT_NOCTO, ",nocto", "" },
515 { NFS_MOUNT_NOAC, ",noac", "" },
516 { NFS_MOUNT_NONLM, ",nolock", "" },
517 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 518 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 519 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
520 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 521 { 0, NULL, NULL }
522 };
509de811 523 const struct proc_nfs_info *nfs_infop;
8fa5c000 524 struct nfs_client *clp = nfss->nfs_client;
82d101d5 525 u32 version = clp->rpc_ops->version;
f7b422b1 526
82d101d5 527 seq_printf(m, ",vers=%u", version);
2d767432
CL		 528 seq_printf(m, ",rsize=%u", nfss->rsize);
529 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 530 if (nfss->bsize != 0)
531 seq_printf(m, ",bsize=%u", nfss->bsize);
532 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 533 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 534 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 535 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 536 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 537 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 538 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 539 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 540 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 541 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
542 if (nfss->flags & nfs_infop->flag)
543 seq_puts(m, nfs_infop->str);
544 else
545 seq_puts(m, nfs_infop->nostr);
546 }
56928edd
TT		 547 seq_printf(m, ",proto=%s",
548 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 549 if (version == 4) {
550 if (nfss->port != NFS_PORT)
551 seq_printf(m, ",port=%u", nfss->port);
552 } else
553 if (nfss->port)
554 seq_printf(m, ",port=%u", nfss->port);
555
33170233
TM		 556 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
557 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 558 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 559
560 if (version != 4)
561 nfs_show_mountd_options(m, nfss, showdefaults);
562
563#ifdef CONFIG_NFS_V4
564 if (clp->rpc_ops->version == 4)
565 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
566#endif
f7b422b1
DH		 567}
568
569/*
570 * Describe the mount options on this VFS mountpoint
571 */
572static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
573{
574 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
575
576 nfs_show_mount_options(m, nfss, 0);
577
5d8515ca
CL		 578 seq_printf(m, ",addr=%s",
579 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
580 RPC_DISPLAY_ADDR));
f7b422b1
DH		 581
582 return 0;
583}
584
585/*
586 * Present statistical information for this VFS mountpoint
587 */
588static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
589{
590 int i, cpu;
591 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
592 struct rpc_auth *auth = nfss->client->cl_auth;
593 struct nfs_iostats totals = { };
594
595 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
596
597 /*
598 * Display all mount option settings
599 */
600 seq_printf(m, "\n\topts:\t");
601 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
602 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
603 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
604 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
605 nfs_show_mount_options(m, nfss, 1);
606
607 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
608
609 seq_printf(m, "\n\tcaps:\t");
610 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 611 seq_printf(m, ",wtmult=%u", nfss->wtmult);
612 seq_printf(m, ",dtsize=%u", nfss->dtsize);
613 seq_printf(m, ",bsize=%u", nfss->bsize);
614 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 615
616#ifdef CONFIG_NFS_V4
40c55319 617 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 618 seq_printf(m, "\n\tnfsv4:\t");
619 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
620 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
621 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
622 }
623#endif
624
625 /*
626 * Display security flavor in effect for this mount
627 */
2d767432 628 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 629 if (auth->au_flavor)
2d767432 630 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 631
632 /*
633 * Display superblock I/O counters
634 */
635 for_each_possible_cpu(cpu) {
636 struct nfs_iostats *stats;
637
638 preempt_disable();
639 stats = per_cpu_ptr(nfss->io_stats, cpu);
640
641 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
642 totals.events[i] += stats->events[i];
643 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
644 totals.bytes[i] += stats->bytes[i];
645
646 preempt_enable();
647 }
648
649 seq_printf(m, "\n\tevents:\t");
650 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
651 seq_printf(m, "%lu ", totals.events[i]);
652 seq_printf(m, "\n\tbytes:\t");
653 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
654 seq_printf(m, "%Lu ", totals.bytes[i]);
655 seq_printf(m, "\n");
656
657 rpc_print_iostats(m, nfss->client);
658
659 return 0;
660}
661
662/*
663 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 664 * in response to xdev traversals and referrals
f7b422b1 665 */
42faad99 666static void nfs_umount_begin(struct super_block *sb)
f7b422b1 667{
42faad99 668 struct nfs_server *server = NFS_SB(sb);
fc6ae3cf
TM		 669 struct rpc_clnt *rpc;
670
fc6ae3cf
TM		 671 /* -EIO all pending I/O */
672 rpc = server->client_acl;
673 if (!IS_ERR(rpc))
674 rpc_killall_tasks(rpc);
675 rpc = server->client;
676 if (!IS_ERR(rpc))
677 rpc_killall_tasks(rpc);
f7b422b1
DH		 678}
679
fc50d58f 680/*
cdcd7f9a
CL		 681 * Sanity-check a server address provided by the mount command.
682 *
683 * Address family must be initialized, and address must not be
684 * the ANY address for that family.
fc50d58f
CL		 685 */
686static int nfs_verify_server_address(struct sockaddr *addr)
687{
688 switch (addr->sa_family) {
689 case AF_INET: {
cdcd7f9a 690 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 691 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 692 }
693 case AF_INET6: {
694 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
695 return !ipv6_addr_any(sa);
fc50d58f
CL		 696 }
697 }
698
699 return 0;
700}
701
ce3b7e19
CL		 702static void nfs_parse_ipv4_address(char *string, size_t str_len,
703 struct sockaddr *sap, size_t *addr_len)
9412b927 704{
ce3b7e19
CL		 705 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
706 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
9412b927 707
ce3b7e19
CL		 708 if (str_len <= INET_ADDRSTRLEN) {
709 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
710 (int)str_len, string);
711
712 sin->sin_family = AF_INET;
713 *addr_len = sizeof(*sin);
714 if (in4_pton(string, str_len, addr, '\0', NULL))
3c7c7e48 715 return;
ce3b7e19
CL		 716 }
717
718 sap->sa_family = AF_UNSPEC;
719 *addr_len = 0;
720}
721
722#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5e2e7721
CL		 723static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
724 const char *delim,
725 struct sockaddr_in6 *sin6)
d8e7748a
CL		 726{
727 char *p;
728 size_t len;
729
5e2e7721
CL		 730 if ((string + str_len) == delim)
731 return 1;
732
d8e7748a 733 if (*delim != IPV6_SCOPE_DELIMITER)
5e2e7721
CL		 734 return 0;
735
736 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
737 return 0;
d8e7748a
CL		 738
739 len = (string + str_len) - delim - 1;
740 p = kstrndup(delim + 1, len, GFP_KERNEL);
741 if (p) {
742 unsigned long scope_id = 0;
743 struct net_device *dev;
744
745 dev = dev_get_by_name(&init_net, p);
746 if (dev != NULL) {
747 scope_id = dev->ifindex;
748 dev_put(dev);
749 } else {
5e2e7721
CL		 750 if (strict_strtoul(p, 10, &scope_id) == 0) {
751 kfree(p);
752 return 0;
753 }
d8e7748a
CL		 754 }
755
756 kfree(p);
5e2e7721 757
d8e7748a
CL		 758 sin6->sin6_scope_id = scope_id;
759 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
5e2e7721 760 return 1;
d8e7748a 761 }
5e2e7721
CL		 762
763 return 0;
d8e7748a
CL		 764}
765
ce3b7e19
CL		 766static void nfs_parse_ipv6_address(char *string, size_t str_len,
767 struct sockaddr *sap, size_t *addr_len)
768{
769 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
770 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
d8e7748a 771 const char *delim;
ce3b7e19
CL		 772
773 if (str_len <= INET6_ADDRSTRLEN) {
774 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
775 (int)str_len, string);
3c7c7e48 776
ce3b7e19
CL		 777 sin6->sin6_family = AF_INET6;
778 *addr_len = sizeof(*sin6);
5e2e7721
CL		 779 if (in6_pton(string, str_len, addr,
780 IPV6_SCOPE_DELIMITER, &delim) != 0) {
781 if (nfs_parse_ipv6_scope_id(string, str_len,
782 delim, sin6) != 0)
783 return;
d8e7748a 784 }
3c7c7e48 785 }
9412b927
CL		 786
787 sap->sa_family = AF_UNSPEC;
ce3b7e19
CL		 788 *addr_len = 0;
789}
790#else
791static void nfs_parse_ipv6_address(char *string, size_t str_len,
792 struct sockaddr *sap, size_t *addr_len)
793{
794 sap->sa_family = AF_UNSPEC;
795 *addr_len = 0;
796}
797#endif
798
799/*
800 * Construct a sockaddr based on the contents of a string that contains
801 * an IP address in presentation format.
802 *
803 * If there is a problem constructing the new sockaddr, set the address
804 * family to AF_UNSPEC.
805 */
ea31a443 806void nfs_parse_ip_address(char *string, size_t str_len,
ce3b7e19
CL		 807 struct sockaddr *sap, size_t *addr_len)
808{
809 unsigned int i, colons;
810
811 colons = 0;
812 for (i = 0; i < str_len; i++)
813 if (string[i] == ':')
814 colons++;
815
816 if (colons >= 2)
817 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
818 else
819 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
9412b927
CL		 820}
821
259875ef
TM		 822/*
823 * Sanity check the NFS transport protocol.
824 *
825 */
826static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
827{
828 switch (mnt->nfs_server.protocol) {
829 case XPRT_TRANSPORT_UDP:
830 case XPRT_TRANSPORT_TCP:
831 case XPRT_TRANSPORT_RDMA:
832 break;
833 default:
834 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
835 }
836}
837
838/*
839 * For text based NFSv2/v3 mounts, the mount protocol transport default
840 * settings should depend upon the specified NFS transport.
841 */
842static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
843{
844 nfs_validate_transport_protocol(mnt);
845
846 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
847 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
848 return;
849 switch (mnt->nfs_server.protocol) {
850 case XPRT_TRANSPORT_UDP:
851 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
852 break;
853 case XPRT_TRANSPORT_TCP:
854 case XPRT_TRANSPORT_RDMA:
855 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
856 }
857}
858
01060c89
CL		 859/*
860 * Parse the value of the 'sec=' option.
861 *
dd07c947 862 * The flavor_len setting is for v4 mounts.
01060c89
CL		 863 */
864static int nfs_parse_security_flavors(char *value,
865 struct nfs_parsed_mount_data *mnt)
866{
867 substring_t args[MAX_OPT_ARGS];
868
869 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
870
871 switch (match_token(value, nfs_secflavor_tokens, args)) {
872 case Opt_sec_none:
01060c89
CL		 873 mnt->auth_flavor_len = 0;
874 mnt->auth_flavors[0] = RPC_AUTH_NULL;
875 break;
876 case Opt_sec_sys:
01060c89
CL		 877 mnt->auth_flavor_len = 0;
878 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
879 break;
880 case Opt_sec_krb5:
01060c89
CL		 881 mnt->auth_flavor_len = 1;
882 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
883 break;
884 case Opt_sec_krb5i:
01060c89
CL		 885 mnt->auth_flavor_len = 1;
886 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
887 break;
888 case Opt_sec_krb5p:
01060c89
CL		 889 mnt->auth_flavor_len = 1;
890 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
891 break;
892 case Opt_sec_lkey:
01060c89
CL		 893 mnt->auth_flavor_len = 1;
894 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
895 break;
896 case Opt_sec_lkeyi:
01060c89
CL		 897 mnt->auth_flavor_len = 1;
898 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
899 break;
900 case Opt_sec_lkeyp:
01060c89
CL		 901 mnt->auth_flavor_len = 1;
902 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
903 break;
904 case Opt_sec_spkm:
01060c89
CL		 905 mnt->auth_flavor_len = 1;
906 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
907 break;
908 case Opt_sec_spkmi:
01060c89
CL		 909 mnt->auth_flavor_len = 1;
910 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
911 break;
912 case Opt_sec_spkmp:
01060c89
CL		 913 mnt->auth_flavor_len = 1;
914 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
915 break;
916 default:
917 return 0;
918 }
919
920 return 1;
921}
922
f45663ce
CL		 923static void nfs_parse_invalid_value(const char *option)
924{
925 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
926}
927
bf0fd768
CL		 928/*
929 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 930 * a data structure. The whole mount string is processed; bad options are
931 * skipped as they are encountered. If there were no errors, return 1;
932 * otherwise return 0 (zero).
bf0fd768
CL		 933 */
934static int nfs_parse_mount_options(char *raw,
935 struct nfs_parsed_mount_data *mnt)
936{
f9c3a380 937 char *p, *string, *secdata;
f45663ce 938 int rc, sloppy = 0, errors = 0;
bf0fd768
CL		 939
940 if (!raw) {
941 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
942 return 1;
943 }
944 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
945
f9c3a380
EP		 946 secdata = alloc_secdata();
947 if (!secdata)
948 goto out_nomem;
949
950 rc = security_sb_copy_data(raw, secdata);
951 if (rc)
952 goto out_security_failure;
953
954 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
955 if (rc)
956 goto out_security_failure;
957
958 free_secdata(secdata);
959
bf0fd768
CL		 960 while ((p = strsep(&raw, ",")) != NULL) {
961 substring_t args[MAX_OPT_ARGS];
962 int option, token;
963
964 if (!*p)
965 continue;
966
967 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
968
969 token = match_token(p, nfs_mount_option_tokens, args);
970 switch (token) {
f45663ce
CL		 971
972 /*
973 * boolean options: foo/nofoo
974 */
bf0fd768
CL		 975 case Opt_soft:
976 mnt->flags |= NFS_MOUNT_SOFT;
977 break;
978 case Opt_hard:
979 mnt->flags &= ~NFS_MOUNT_SOFT;
980 break;
bf0fd768
CL		 981 case Opt_posix:
982 mnt->flags |= NFS_MOUNT_POSIX;
983 break;
984 case Opt_noposix:
985 mnt->flags &= ~NFS_MOUNT_POSIX;
986 break;
987 case Opt_cto:
988 mnt->flags &= ~NFS_MOUNT_NOCTO;
989 break;
990 case Opt_nocto:
991 mnt->flags |= NFS_MOUNT_NOCTO;
992 break;
993 case Opt_ac:
994 mnt->flags &= ~NFS_MOUNT_NOAC;
995 break;
996 case Opt_noac:
997 mnt->flags |= NFS_MOUNT_NOAC;
998 break;
999 case Opt_lock:
1000 mnt->flags &= ~NFS_MOUNT_NONLM;
1001 break;
1002 case Opt_nolock:
1003 mnt->flags |= NFS_MOUNT_NONLM;
1004 break;
1005 case Opt_v2:
1006 mnt->flags &= ~NFS_MOUNT_VER3;
1007 break;
1008 case Opt_v3:
1009 mnt->flags |= NFS_MOUNT_VER3;
1010 break;
1011 case Opt_udp:
1012 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1013 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1014 break;
1015 case Opt_tcp:
1016 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1017 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1018 break;
2cf7ff7a
TT		 1019 case Opt_rdma:
1020 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1021 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1022 xprt_load_transport(p);
2cf7ff7a 1023 break;
bf0fd768
CL		 1024 case Opt_acl:
1025 mnt->flags &= ~NFS_MOUNT_NOACL;
1026 break;
1027 case Opt_noacl:
1028 mnt->flags |= NFS_MOUNT_NOACL;
1029 break;
1030 case Opt_rdirplus:
1031 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1032 break;
1033 case Opt_nordirplus:
1034 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1035 break;
75180df2
TM		 1036 case Opt_sharecache:
1037 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1038 break;
1039 case Opt_nosharecache:
1040 mnt->flags |= NFS_MOUNT_UNSHARED;
1041 break;
d740351b
CL		 1042 case Opt_resvport:
1043 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1044 break;
1045 case Opt_noresvport:
1046 mnt->flags |= NFS_MOUNT_NORESVPORT;
1047 break;
bf0fd768 1048
f45663ce
CL		 1049 /*
1050 * options that take numeric values
1051 */
bf0fd768 1052 case Opt_port:
f45663ce
CL		 1053 if (match_int(args, &option) ||
1054 option < 0 || option > USHORT_MAX) {
1055 errors++;
1056 nfs_parse_invalid_value("port");
1057 } else
1058 mnt->nfs_server.port = option;
bf0fd768
CL		 1059 break;
1060 case Opt_rsize:
f45663ce
CL		 1061 if (match_int(args, &option) || option < 0) {
1062 errors++;
1063 nfs_parse_invalid_value("rsize");
1064 } else
1065 mnt->rsize = option;
bf0fd768
CL		 1066 break;
1067 case Opt_wsize:
f45663ce
CL		 1068 if (match_int(args, &option) || option < 0) {
1069 errors++;
1070 nfs_parse_invalid_value("wsize");
1071 } else
1072 mnt->wsize = option;
bf0fd768
CL		 1073 break;
1074 case Opt_bsize:
f45663ce
CL		 1075 if (match_int(args, &option) || option < 0) {
1076 errors++;
1077 nfs_parse_invalid_value("bsize");
1078 } else
1079 mnt->bsize = option;
bf0fd768
CL		 1080 break;
1081 case Opt_timeo:
f45663ce
CL		 1082 if (match_int(args, &option) || option <= 0) {
1083 errors++;
1084 nfs_parse_invalid_value("timeo");
1085 } else
1086 mnt->timeo = option;
bf0fd768
CL		 1087 break;
1088 case Opt_retrans:
f45663ce
CL		 1089 if (match_int(args, &option) || option <= 0) {
1090 errors++;
1091 nfs_parse_invalid_value("retrans");
1092 } else
1093 mnt->retrans = option;
bf0fd768
CL		 1094 break;
1095 case Opt_acregmin:
f45663ce
CL		 1096 if (match_int(args, &option) || option < 0) {
1097 errors++;
1098 nfs_parse_invalid_value("acregmin");
1099 } else
1100 mnt->acregmin = option;
bf0fd768
CL		 1101 break;
1102 case Opt_acregmax:
f45663ce
CL		 1103 if (match_int(args, &option) || option < 0) {
1104 errors++;
1105 nfs_parse_invalid_value("acregmax");
1106 } else
1107 mnt->acregmax = option;
bf0fd768
CL		 1108 break;
1109 case Opt_acdirmin:
f45663ce
CL		 1110 if (match_int(args, &option) || option < 0) {
1111 errors++;
1112 nfs_parse_invalid_value("acdirmin");
1113 } else
1114 mnt->acdirmin = option;
bf0fd768
CL		 1115 break;
1116 case Opt_acdirmax:
f45663ce
CL		 1117 if (match_int(args, &option) || option < 0) {
1118 errors++;
1119 nfs_parse_invalid_value("acdirmax");
1120 } else
1121 mnt->acdirmax = option;
bf0fd768
CL		 1122 break;
1123 case Opt_actimeo:
f45663ce
CL		 1124 if (match_int(args, &option) || option < 0) {
1125 errors++;
1126 nfs_parse_invalid_value("actimeo");
1127 } else
1128 mnt->acregmin = mnt->acregmax =
1129 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1130 break;
1131 case Opt_namelen:
f45663ce
CL		 1132 if (match_int(args, &option) || option < 0) {
1133 errors++;
1134 nfs_parse_invalid_value("namlen");
1135 } else
1136 mnt->namlen = option;
bf0fd768
CL		 1137 break;
1138 case Opt_mountport:
f45663ce
CL		 1139 if (match_int(args, &option) ||
1140 option < 0 || option > USHORT_MAX) {
1141 errors++;
1142 nfs_parse_invalid_value("mountport");
1143 } else
1144 mnt->mount_server.port = option;
bf0fd768 1145 break;
bf0fd768 1146 case Opt_mountvers:
f45663ce
CL		 1147 if (match_int(args, &option) ||
1148 option < NFS_MNT_VERSION ||
1149 option > NFS_MNT3_VERSION) {
1150 errors++;
1151 nfs_parse_invalid_value("mountvers");
1152 } else
1153 mnt->mount_server.version = option;
bf0fd768 1154 break;
bf0fd768 1155 case Opt_nfsvers:
f45663ce
CL		 1156 if (match_int(args, &option)) {
1157 errors++;
1158 nfs_parse_invalid_value("nfsvers");
1159 break;
1160 }
bf0fd768 1161 switch (option) {
f45663ce 1162 case NFS2_VERSION:
bf0fd768
CL		 1163 mnt->flags &= ~NFS_MOUNT_VER3;
1164 break;
f45663ce 1165 case NFS3_VERSION:
bf0fd768
CL		 1166 mnt->flags |= NFS_MOUNT_VER3;
1167 break;
1168 default:
f45663ce
CL		 1169 errors++;
1170 nfs_parse_invalid_value("nfsvers");
bf0fd768
CL		 1171 }
1172 break;
1173
f45663ce
CL		 1174 /*
1175 * options that take text values
1176 */
bf0fd768
CL		 1177 case Opt_sec:
1178 string = match_strdup(args);
1179 if (string == NULL)
1180 goto out_nomem;
01060c89 1181 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1182 kfree(string);
f45663ce
CL		 1183 if (!rc) {
1184 errors++;
1185 dfprintk(MOUNT, "NFS: unrecognized "
1186 "security flavor\n");
1187 }
bf0fd768
CL		 1188 break;
1189 case Opt_proto:
1190 string = match_strdup(args);
1191 if (string == NULL)
1192 goto out_nomem;
1193 token = match_token(string,
1194 nfs_xprt_protocol_tokens, args);
1195 kfree(string);
1196
1197 switch (token) {
fdb66ff4 1198 case Opt_xprt_udp:
bf0fd768 1199 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1200 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1201 break;
fdb66ff4 1202 case Opt_xprt_tcp:
bf0fd768 1203 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1204 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1205 break;
2cf7ff7a
TT		 1206 case Opt_xprt_rdma:
1207 /* vector side protocols to TCP */
1208 mnt->flags |= NFS_MOUNT_TCP;
1209 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1210 xprt_load_transport(string);
2cf7ff7a 1211 break;
bf0fd768 1212 default:
f45663ce
CL		 1213 errors++;
1214 dfprintk(MOUNT, "NFS: unrecognized "
1215 "transport protocol\n");
bf0fd768 1216 }
a67d18f8 1217 kfree(string);
bf0fd768
CL		 1218 break;
1219 case Opt_mountproto:
1220 string = match_strdup(args);
1221 if (string == NULL)
1222 goto out_nomem;
1223 token = match_token(string,
1224 nfs_xprt_protocol_tokens, args);
bf0fd768
CL		 1225
1226 switch (token) {
fdb66ff4 1227 case Opt_xprt_udp:
0896a725 1228 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1229 break;
fdb66ff4 1230 case Opt_xprt_tcp:
0896a725 1231 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1232 break;
2cf7ff7a 1233 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1234 default:
f45663ce
CL		 1235 errors++;
1236 dfprintk(MOUNT, "NFS: unrecognized "
1237 "transport protocol\n");
bf0fd768
CL		 1238 }
1239 break;
1240 case Opt_addr:
1241 string = match_strdup(args);
1242 if (string == NULL)
1243 goto out_nomem;
ce3b7e19
CL		 1244 nfs_parse_ip_address(string, strlen(string),
1245 (struct sockaddr *)
1246 &mnt->nfs_server.address,
1247 &mnt->nfs_server.addrlen);
bf0fd768
CL		 1248 kfree(string);
1249 break;
1250 case Opt_clientaddr:
1251 string = match_strdup(args);
1252 if (string == NULL)
1253 goto out_nomem;
fc601477 1254 kfree(mnt->client_address);
bf0fd768
CL		 1255 mnt->client_address = string;
1256 break;
33832034
CL		 1257 case Opt_mounthost:
1258 string = match_strdup(args);
1259 if (string == NULL)
1260 goto out_nomem;
fc601477 1261 kfree(mnt->mount_server.hostname);
33832034
CL		 1262 mnt->mount_server.hostname = string;
1263 break;
0ac83779 1264 case Opt_mountaddr:
bf0fd768
CL		 1265 string = match_strdup(args);
1266 if (string == NULL)
1267 goto out_nomem;
ce3b7e19
CL		 1268 nfs_parse_ip_address(string, strlen(string),
1269 (struct sockaddr *)
1270 &mnt->mount_server.address,
1271 &mnt->mount_server.addrlen);
bf0fd768
CL		 1272 kfree(string);
1273 break;
7973c1f1
TM		 1274 case Opt_lookupcache:
1275 string = match_strdup(args);
1276 if (string == NULL)
1277 goto out_nomem;
1278 token = match_token(string,
1279 nfs_lookupcache_tokens, args);
1280 kfree(string);
1281 switch (token) {
1282 case Opt_lookupcache_all:
1283 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1284 break;
1285 case Opt_lookupcache_positive:
1286 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1287 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1288 break;
1289 case Opt_lookupcache_none:
1290 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1291 break;
1292 default:
1293 errors++;
1294 dfprintk(MOUNT, "NFS: invalid "
1295 "lookupcache argument\n");
1296 };
1297 break;
bf0fd768 1298
f45663ce
CL		 1299 /*
1300 * Special options
1301 */
1302 case Opt_sloppy:
1303 sloppy = 1;
1304 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1305 break;
bf0fd768
CL		 1306 case Opt_userspace:
1307 case Opt_deprecated:
d33e4dfe
CL		 1308 dfprintk(MOUNT, "NFS: ignoring mount option "
1309 "'%s'\n", p);
bf0fd768
CL		 1310 break;
1311
1312 default:
f45663ce
CL		 1313 errors++;
1314 dfprintk(MOUNT, "NFS: unrecognized mount option "
1315 "'%s'\n", p);
bf0fd768
CL		 1316 }
1317 }
1318
af904dea
CL		 1319 if (errors > 0) {
1320 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1321 errors, (errors == 1 ? "" : "s"));
1322 if (!sloppy)
1323 return 0;
1324 }
bf0fd768
CL		 1325 return 1;
1326
1327out_nomem:
1328 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1329 return 0;
f9c3a380
EP		 1330out_security_failure:
1331 free_secdata(secdata);
1332 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1333 return 0;
bf0fd768
CL		 1334}
1335
0076d7b7
CL		 1336/*
1337 * Use the remote server's MOUNT service to request the NFS file handle
1338 * corresponding to the provided path.
1339 */
1340static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1341 struct nfs_fh *root_fh)
1342{
c5d120f8
CL		 1343 struct nfs_mount_request request = {
1344 .sap = (struct sockaddr *)
1345 &args->mount_server.address,
1346 .dirpath = args->nfs_server.export_path,
1347 .protocol = args->mount_server.protocol,
1348 .fh = root_fh,
50a737f8 1349 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
c5d120f8 1350 };
4c568017 1351 int status;
0076d7b7
CL		 1352
1353 if (args->mount_server.version == 0) {
1354 if (args->flags & NFS_MOUNT_VER3)
1355 args->mount_server.version = NFS_MNT3_VERSION;
1356 else
1357 args->mount_server.version = NFS_MNT_VERSION;
1358 }
c5d120f8 1359 request.version = args->mount_server.version;
0076d7b7 1360
33832034 1361 if (args->mount_server.hostname)
c5d120f8 1362 request.hostname = args->mount_server.hostname;
33832034 1363 else
c5d120f8 1364 request.hostname = args->nfs_server.hostname;
33832034 1365
0076d7b7
CL		 1366 /*
1367 * Construct the mount server's address.
1368 */
4c568017 1369 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1370 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1371 args->nfs_server.addrlen);
1372 args->mount_server.addrlen = args->nfs_server.addrlen;
1373 }
c5d120f8 1374 request.salen = args->mount_server.addrlen;
4c568017 1375
aad70007
JL		 1376 /*
1377 * autobind will be used if mount_server.port == 0
1378 */
c5d120f8 1379 nfs_set_port(request.sap, args->mount_server.port);
0076d7b7
CL		 1380
1381 /*
1382 * Now ask the mount server to map our export path
1383 * to a file handle.
1384 */
c5d120f8 1385 status = nfs_mount(&request);
efd8340b
CL		 1386 if (status == 0)
1387 return 0;
0076d7b7 1388
396cee97 1389 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
c5d120f8 1390 request.hostname, status);
0076d7b7
CL		 1391 return status;
1392}
1393
d1aa0825
CL		 1394static int nfs_parse_simple_hostname(const char *dev_name,
1395 char **hostname, size_t maxnamlen,
1396 char **export_path, size_t maxpathlen)
dc045898
CL		 1397{
1398 size_t len;
1399 char *colon, *comma;
1400
1401 colon = strchr(dev_name, ':');
1402 if (colon == NULL)
1403 goto out_bad_devname;
1404
1405 len = colon - dev_name;
1406 if (len > maxnamlen)
1407 goto out_hostname;
1408
1409 /* N.B. caller will free nfs_server.hostname in all cases */
1410 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1411 if (!*hostname)
1412 goto out_nomem;
1413
1414 /* kill possible hostname list: not supported */
1415 comma = strchr(*hostname, ',');
1416 if (comma != NULL) {
1417 if (comma == *hostname)
1418 goto out_bad_devname;
1419 *comma = '\0';
1420 }
1421
1422 colon++;
1423 len = strlen(colon);
1424 if (len > maxpathlen)
1425 goto out_path;
1426 *export_path = kstrndup(colon, len, GFP_KERNEL);
1427 if (!*export_path)
1428 goto out_nomem;
1429
1430 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1431 return 0;
1432
1433out_bad_devname:
1434 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1435 return -EINVAL;
1436
1437out_nomem:
1438 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1439 return -ENOMEM;
1440
1441out_hostname:
1442 dfprintk(MOUNT, "NFS: server hostname too long\n");
1443 return -ENAMETOOLONG;
1444
1445out_path:
1446 dfprintk(MOUNT, "NFS: export pathname too long\n");
1447 return -ENAMETOOLONG;
1448}
1449
d1aa0825
CL		 1450/*
1451 * Hostname has square brackets around it because it contains one or
1452 * more colons. We look for the first closing square bracket, and a
1453 * colon must follow it.
1454 */
1455static int nfs_parse_protected_hostname(const char *dev_name,
1456 char **hostname, size_t maxnamlen,
1457 char **export_path, size_t maxpathlen)
1458{
1459 size_t len;
1460 char *start, *end;
1461
1462 start = (char *)(dev_name + 1);
1463
1464 end = strchr(start, ']');
1465 if (end == NULL)
1466 goto out_bad_devname;
1467 if (*(end + 1) != ':')
1468 goto out_bad_devname;
1469
1470 len = end - start;
1471 if (len > maxnamlen)
1472 goto out_hostname;
1473
1474 /* N.B. caller will free nfs_server.hostname in all cases */
1475 *hostname = kstrndup(start, len, GFP_KERNEL);
1476 if (*hostname == NULL)
1477 goto out_nomem;
1478
1479 end += 2;
1480 len = strlen(end);
1481 if (len > maxpathlen)
1482 goto out_path;
1483 *export_path = kstrndup(end, len, GFP_KERNEL);
1484 if (!*export_path)
1485 goto out_nomem;
1486
1487 return 0;
1488
1489out_bad_devname:
1490 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1491 return -EINVAL;
1492
1493out_nomem:
1494 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1495 return -ENOMEM;
1496
1497out_hostname:
1498 dfprintk(MOUNT, "NFS: server hostname too long\n");
1499 return -ENAMETOOLONG;
1500
1501out_path:
1502 dfprintk(MOUNT, "NFS: export pathname too long\n");
1503 return -ENAMETOOLONG;
1504}
1505
1506/*
1507 * Split "dev_name" into "hostname:export_path".
1508 *
1509 * The leftmost colon demarks the split between the server's hostname
1510 * and the export path. If the hostname starts with a left square
1511 * bracket, then it may contain colons.
1512 *
1513 * Note: caller frees hostname and export path, even on error.
1514 */
1515static int nfs_parse_devname(const char *dev_name,
1516 char **hostname, size_t maxnamlen,
1517 char **export_path, size_t maxpathlen)
1518{
1519 if (*dev_name == '[')
1520 return nfs_parse_protected_hostname(dev_name,
1521 hostname, maxnamlen,
1522 export_path, maxpathlen);
1523
1524 return nfs_parse_simple_hostname(dev_name,
1525 hostname, maxnamlen,
1526 export_path, maxpathlen);
1527}
1528
f7b422b1 1529/*
54ceac45
DH		 1530 * Validate the NFS2/NFS3 mount data
1531 * - fills in the mount root filehandle
136d558c
CL		 1532 *
1533 * For option strings, user space handles the following behaviors:
1534 *
1535 * + DNS: mapping server host name to IP address ("addr=" option)
1536 *
1537 * + failure mode: how to behave if a mount request can't be handled
1538 * immediately ("fg/bg" option)
1539 *
1540 * + retry: how often to retry a mount request ("retry=" option)
1541 *
1542 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1543 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1544 */
2283f8d6
TT		 1545static int nfs_validate_mount_data(void *options,
1546 struct nfs_parsed_mount_data *args,
136d558c
CL		 1547 struct nfs_fh *mntfh,
1548 const char *dev_name)
f7b422b1 1549{
2283f8d6 1550 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
136d558c 1551
5df36e78
CL		 1552 if (data == NULL)
1553 goto out_no_data;
f7b422b1 1554
2283f8d6
TT		 1555 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1556 args->rsize = NFS_MAX_FILE_IO_SIZE;
1557 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1558 args->acregmin = NFS_DEF_ACREGMIN;
1559 args->acregmax = NFS_DEF_ACREGMAX;
1560 args->acdirmin = NFS_DEF_ACDIRMIN;
1561 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 1562 args->mount_server.port = 0; /* autobind unless user sets port */
f22d6d79 1563 args->nfs_server.port = 0; /* autobind unless user sets port */
0896a725 1564 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1565 args->auth_flavors[0] = RPC_AUTH_UNIX;
2283f8d6 1566
54ceac45 1567 switch (data->version) {
5df36e78
CL		 1568 case 1:
1569 data->namlen = 0;
1570 case 2:
1571 data->bsize = 0;
1572 case 3:
1573 if (data->flags & NFS_MOUNT_VER3)
1574 goto out_no_v3;
1575 data->root.size = NFS2_FHSIZE;
1576 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1577 case 4:
1578 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1579 goto out_no_sec;
1580 case 5:
1581 memset(data->context, 0, sizeof(data->context));
1582 case 6:
b7e24457
TM		 1583 if (data->flags & NFS_MOUNT_VER3) {
1584 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1585 goto out_invalid_fh;
5df36e78 1586 mntfh->size = data->root.size;
b7e24457 1587 } else
5df36e78
CL		 1588 mntfh->size = NFS2_FHSIZE;
1589
5df36e78
CL		 1590
1591 memcpy(mntfh->data, data->root.data, mntfh->size);
1592 if (mntfh->size < sizeof(mntfh->data))
1593 memset(mntfh->data + mntfh->size, 0,
1594 sizeof(mntfh->data) - mntfh->size);
6e88e061 1595
2283f8d6
TT		 1596 /*
1597 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1598 * can deal with.
1599 */
ff3525a5 1600 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1601 args->rsize = data->rsize;
1602 args->wsize = data->wsize;
2283f8d6
TT		 1603 args->timeo = data->timeo;
1604 args->retrans = data->retrans;
1605 args->acregmin = data->acregmin;
1606 args->acregmax = data->acregmax;
1607 args->acdirmin = data->acdirmin;
1608 args->acdirmax = data->acdirmax;
4c568017
CL		 1609
1610 memcpy(&args->nfs_server.address, &data->addr,
1611 sizeof(data->addr));
1612 args->nfs_server.addrlen = sizeof(data->addr);
1613 if (!nfs_verify_server_address((struct sockaddr *)
1614 &args->nfs_server.address))
1615 goto out_no_address;
1616
2283f8d6 1617 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1618 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1619 /* N.B. caller will free nfs_server.hostname in all cases */
1620 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1621 args->namlen = data->namlen;
1622 args->bsize = data->bsize;
dd07c947
CL		 1623
1624 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1625 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1626 if (!args->nfs_server.hostname)
1627 goto out_nomem;
f9c3a380
EP		 1628
1629 /*
1630 * The legacy version 6 binary mount data from userspace has a
1631 * field used only to transport selinux information into the
1632 * the kernel. To continue to support that functionality we
1633 * have a touch of selinux knowledge here in the NFS code. The
1634 * userspace code converted context=blah to just blah so we are
1635 * converting back to the full string selinux understands.
1636 */
1637 if (data->context[0]){
1638#ifdef CONFIG_SECURITY_SELINUX
1639 int rc;
1640 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1641 if (!opts_str)
1642 return -ENOMEM;
1643 strcpy(opts_str, "context=");
1644 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1645 strcat(opts_str, &data->context[0]);
1646 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1647 kfree(opts_str);
1648 if (rc)
1649 return rc;
1650#else
1651 return -EINVAL;
1652#endif
1653 }
1654
5df36e78 1655 break;
136d558c 1656 default: {
136d558c 1657 int status;
136d558c 1658
2283f8d6
TT		 1659 if (nfs_parse_mount_options((char *)options, args) == 0)
1660 return -EINVAL;
136d558c 1661
6e88e061
CL		 1662 if (!nfs_verify_server_address((struct sockaddr *)
1663 &args->nfs_server.address))
1664 goto out_no_address;
1665
ed596a8a
CL		 1666 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1667 args->nfs_server.port);
1668
259875ef
TM		 1669 nfs_set_mount_transport_protocol(args);
1670
dc045898
CL		 1671 status = nfs_parse_devname(dev_name,
1672 &args->nfs_server.hostname,
1673 PAGE_SIZE,
1674 &args->nfs_server.export_path,
1675 NFS_MAXPATHLEN);
1676 if (!status)
1677 status = nfs_try_mount(args, mntfh);
136d558c 1678
dc045898
CL		 1679 kfree(args->nfs_server.export_path);
1680 args->nfs_server.export_path = NULL;
136d558c 1681
136d558c 1682 if (status)
fdc6e2c8 1683 return status;
136d558c 1684
136d558c
CL		 1685 break;
1686 }
f7b422b1 1687 }
54ceac45
DH		 1688
1689#ifndef CONFIG_NFS_V3
2283f8d6 1690 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1691 goto out_v3_not_compiled;
1692#endif /* !CONFIG_NFS_V3 */
f7b422b1 1693
5df36e78 1694 return 0;
f7b422b1 1695
5df36e78
CL		 1696out_no_data:
1697 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1698 return -EINVAL;
54ceac45 1699
5df36e78
CL		 1700out_no_v3:
1701 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1702 data->version);
1703 return -EINVAL;
f7b422b1 1704
5df36e78
CL		 1705out_no_sec:
1706 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1707 return -EINVAL;
1708
5df36e78
CL		 1709#ifndef CONFIG_NFS_V3
1710out_v3_not_compiled:
1711 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1712 return -EPROTONOSUPPORT;
1713#endif /* !CONFIG_NFS_V3 */
1714
63649bd7
CG		 1715out_nomem:
1716 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1717 return -ENOMEM;
1718
5df36e78
CL		 1719out_no_address:
1720 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1721 return -EINVAL;
1722
1723out_invalid_fh:
1724 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1725 return -EINVAL;
f7b422b1
DH		 1726}
1727
48b605f8
JL		 1728static int
1729nfs_compare_remount_data(struct nfs_server *nfss,
1730 struct nfs_parsed_mount_data *data)
1731{
1732 if (data->flags != nfss->flags ||
1733 data->rsize != nfss->rsize ||
1734 data->wsize != nfss->wsize ||
1735 data->retrans != nfss->client->cl_timeout->to_retries ||
1736 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1737 data->acregmin != nfss->acregmin / HZ ||
1738 data->acregmax != nfss->acregmax / HZ ||
1739 data->acdirmin != nfss->acdirmin / HZ ||
1740 data->acdirmax != nfss->acdirmax / HZ ||
1741 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1742 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1743 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1744 data->nfs_server.addrlen) != 0)
1745 return -EINVAL;
1746
1747 return 0;
1748}
1749
1750static int
1751nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1752{
1753 int error;
1754 struct nfs_server *nfss = sb->s_fs_info;
1755 struct nfs_parsed_mount_data *data;
1756 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1757 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1758 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1759
1760 /*
1761 * Userspace mount programs that send binary options generally send
1762 * them populated with default values. We have no way to know which
1763 * ones were explicitly specified. Fall back to legacy behavior and
1764 * just return success.
1765 */
31c94469
MZ		 1766 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1767 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1768 options->version <= 6))))
48b605f8
JL		 1769 return 0;
1770
1771 data = kzalloc(sizeof(*data), GFP_KERNEL);
1772 if (data == NULL)
1773 return -ENOMEM;
1774
1775 /* fill out struct with values from existing mount */
1776 data->flags = nfss->flags;
1777 data->rsize = nfss->rsize;
1778 data->wsize = nfss->wsize;
1779 data->retrans = nfss->client->cl_timeout->to_retries;
1780 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1781 data->acregmin = nfss->acregmin / HZ;
1782 data->acregmax = nfss->acregmax / HZ;
1783 data->acdirmin = nfss->acdirmin / HZ;
1784 data->acdirmax = nfss->acdirmax / HZ;
1785 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1786 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1787 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1788 data->nfs_server.addrlen);
1789
1790 /* overwrite those values with any that were specified */
1791 error = nfs_parse_mount_options((char *)options, data);
1792 if (error < 0)
1793 goto out;
1794
1795 /* compare new mount options with old ones */
1796 error = nfs_compare_remount_data(nfss, data);
1797out:
1798 kfree(data);
1799 return error;
1800}
1801
f7b422b1 1802/*
54ceac45 1803 * Initialise the common bits of the superblock
f7b422b1 1804 */
54ceac45 1805static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1806{
54ceac45 1807 struct nfs_server *server = NFS_SB(sb);
5006a76c 1808
54ceac45 1809 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1810
54ceac45
DH		 1811 /* We probably want something more informative here */
1812 snprintf(sb->s_id, sizeof(sb->s_id),
1813 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1814
54ceac45
DH		 1815 if (sb->s_blocksize == 0)
1816 sb->s_blocksize = nfs_block_bits(server->wsize,
1817 &sb->s_blocksize_bits);
f7b422b1 1818
54ceac45
DH		 1819 if (server->flags & NFS_MOUNT_NOAC)
1820 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1821
54ceac45 1822 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1823}
1824
1825/*
54ceac45 1826 * Finish setting up an NFS2/3 superblock
f7b422b1 1827 */
2283f8d6
TT		 1828static void nfs_fill_super(struct super_block *sb,
1829 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1830{
1831 struct nfs_server *server = NFS_SB(sb);
5006a76c 1832
54ceac45
DH		 1833 sb->s_blocksize_bits = 0;
1834 sb->s_blocksize = 0;
1835 if (data->bsize)
1836 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1837
54ceac45
DH		 1838 if (server->flags & NFS_MOUNT_VER3) {
1839 /* The VFS shouldn't apply the umask to mode bits. We will do
1840 * so ourselves when necessary.
1841 */
1842 sb->s_flags |= MS_POSIXACL;
1843 sb->s_time_gran = 1;
816724e6 1844 }
54ceac45
DH		 1845
1846 sb->s_op = &nfs_sops;
1847 nfs_initialise_sb(sb);
f7b422b1
DH		 1848}
1849
1850/*
54ceac45 1851 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1852 */
54ceac45
DH		 1853static void nfs_clone_super(struct super_block *sb,
1854 const struct super_block *old_sb)
f7b422b1 1855{
54ceac45
DH		 1856 struct nfs_server *server = NFS_SB(sb);
1857
1858 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1859 sb->s_blocksize = old_sb->s_blocksize;
1860 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1861
f7b422b1 1862 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1863 /* The VFS shouldn't apply the umask to mode bits. We will do
1864 * so ourselves when necessary.
f7b422b1
DH		 1865 */
1866 sb->s_flags |= MS_POSIXACL;
f7b422b1 1867 sb->s_time_gran = 1;
f7b422b1
DH		 1868 }
1869
54ceac45
DH		 1870 sb->s_op = old_sb->s_op;
1871 nfs_initialise_sb(sb);
f7b422b1
DH		 1872}
1873
275a5d24
TM		 1874static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1875{
1876 const struct nfs_server *a = s->s_fs_info;
1877 const struct rpc_clnt *clnt_a = a->client;
1878 const struct rpc_clnt *clnt_b = b->client;
1879
1880 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1881 goto Ebusy;
1882 if (a->nfs_client != b->nfs_client)
1883 goto Ebusy;
1884 if (a->flags != b->flags)
1885 goto Ebusy;
1886 if (a->wsize != b->wsize)
1887 goto Ebusy;
1888 if (a->rsize != b->rsize)
1889 goto Ebusy;
1890 if (a->acregmin != b->acregmin)
1891 goto Ebusy;
1892 if (a->acregmax != b->acregmax)
1893 goto Ebusy;
1894 if (a->acdirmin != b->acdirmin)
1895 goto Ebusy;
1896 if (a->acdirmax != b->acdirmax)
1897 goto Ebusy;
1898 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1899 goto Ebusy;
e89a5a43 1900 return 1;
275a5d24 1901Ebusy:
e89a5a43
TM		 1902 return 0;
1903}
1904
1905struct nfs_sb_mountdata {
1906 struct nfs_server *server;
1907 int mntflags;
1908};
1909
1910static int nfs_set_super(struct super_block *s, void *data)
1911{
1912 struct nfs_sb_mountdata *sb_mntdata = data;
1913 struct nfs_server *server = sb_mntdata->server;
1914 int ret;
1915
1916 s->s_flags = sb_mntdata->mntflags;
1917 s->s_fs_info = server;
1918 ret = set_anon_super(s, server);
1919 if (ret == 0)
1920 server->s_dev = s->s_dev;
1921 return ret;
1922}
1923
fd00a8ff
CL		 1924static int nfs_compare_super_address(struct nfs_server *server1,
1925 struct nfs_server *server2)
1926{
1927 struct sockaddr *sap1, *sap2;
1928
1929 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1930 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1931
1932 if (sap1->sa_family != sap2->sa_family)
1933 return 0;
1934
1935 switch (sap1->sa_family) {
1936 case AF_INET: {
1937 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1938 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1939 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1940 return 0;
1941 if (sin1->sin_port != sin2->sin_port)
1942 return 0;
1943 break;
1944 }
1945 case AF_INET6: {
1946 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1947 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1948 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1949 return 0;
1950 if (sin1->sin6_port != sin2->sin6_port)
1951 return 0;
1952 break;
1953 }
1954 default:
1955 return 0;
1956 }
1957
1958 return 1;
1959}
1960
e89a5a43
TM		 1961static int nfs_compare_super(struct super_block *sb, void *data)
1962{
1963 struct nfs_sb_mountdata *sb_mntdata = data;
1964 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1965 int mntflags = sb_mntdata->mntflags;
1966
fd00a8ff 1967 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 1968 return 0;
1969 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1970 if (old->flags & NFS_MOUNT_UNSHARED)
1971 return 0;
1972 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1973 return 0;
1974 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 1975}
1976
fa799759
MS		 1977static int nfs_bdi_register(struct nfs_server *server)
1978{
1979 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1980}
1981
816724e6
TM		 1982static int nfs_get_sb(struct file_system_type *fs_type,
1983 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 1984{
f7b422b1
DH		 1985 struct nfs_server *server = NULL;
1986 struct super_block *s;
33852a1f
TM		 1987 struct nfs_parsed_mount_data *data;
1988 struct nfs_fh *mntfh;
54ceac45 1989 struct dentry *mntroot;
75180df2 1990 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1991 struct nfs_sb_mountdata sb_mntdata = {
1992 .mntflags = flags,
1993 };
33852a1f
TM		 1994 int error = -ENOMEM;
1995
1996 data = kzalloc(sizeof(*data), GFP_KERNEL);
1997 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1998 if (data == NULL || mntfh == NULL)
1999 goto out_free_fh;
f7b422b1 2000
33852a1f 2001 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2002
54ceac45 2003 /* Validate the mount data */
33852a1f 2004 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2005 if (error < 0)
0655960f 2006 goto out;
f7b422b1 2007
54ceac45 2008 /* Get a volume representation */
33852a1f 2009 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2010 if (IS_ERR(server)) {
2011 error = PTR_ERR(server);
0655960f 2012 goto out;
f7b422b1 2013 }
e89a5a43 2014 sb_mntdata.server = server;
f7b422b1 2015
75180df2
TM		 2016 if (server->flags & NFS_MOUNT_UNSHARED)
2017 compare_super = NULL;
2018
54ceac45 2019 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2020 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2021 if (IS_ERR(s)) {
2022 error = PTR_ERR(s);
54ceac45 2023 goto out_err_nosb;
816724e6
TM		 2024 }
2025
54ceac45
DH		 2026 if (s->s_fs_info != server) {
2027 nfs_free_server(server);
2028 server = NULL;
fa799759
MS		 2029 } else {
2030 error = nfs_bdi_register(server);
2031 if (error)
2032 goto error_splat_super;
54ceac45 2033 }
f7b422b1 2034
54ceac45
DH		 2035 if (!s->s_root) {
2036 /* initial superblock/root creation */
33852a1f 2037 nfs_fill_super(s, data);
08734048 2038 nfs_fscache_get_super_cookie(s, data);
54ceac45 2039 }
f7b422b1 2040
33852a1f 2041 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2042 if (IS_ERR(mntroot)) {
2043 error = PTR_ERR(mntroot);
2044 goto error_splat_super;
f7b422b1 2045 }
816724e6 2046
33852a1f 2047 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2048 if (error)
2049 goto error_splat_root;
2050
54ceac45
DH		 2051 s->s_flags |= MS_ACTIVE;
2052 mnt->mnt_sb = s;
2053 mnt->mnt_root = mntroot;
0655960f
CL		 2054 error = 0;
2055
2056out:
33852a1f
TM		 2057 kfree(data->nfs_server.hostname);
2058 kfree(data->mount_server.hostname);
08734048 2059 kfree(data->fscache_uniq);
33852a1f
TM		 2060 security_free_mnt_opts(&data->lsm_opts);
2061out_free_fh:
2062 kfree(mntfh);
2063 kfree(data);
0655960f 2064 return error;
816724e6 2065
54ceac45
DH		 2066out_err_nosb:
2067 nfs_free_server(server);
0655960f 2068 goto out;
54ceac45 2069
f9c3a380
EP		 2070error_splat_root:
2071 dput(mntroot);
54ceac45
DH		 2072error_splat_super:
2073 up_write(&s->s_umount);
2074 deactivate_super(s);
0655960f 2075 goto out;
f7b422b1
DH		 2076}
2077
54ceac45
DH		 2078/*
2079 * Destroy an NFS2/3 superblock
2080 */
f7b422b1
DH		 2081static void nfs_kill_super(struct super_block *s)
2082{
2083 struct nfs_server *server = NFS_SB(s);
2084
fa799759 2085 bdi_unregister(&server->backing_dev_info);
f7b422b1 2086 kill_anon_super(s);
08734048 2087 nfs_fscache_release_super_cookie(s);
54ceac45 2088 nfs_free_server(server);
f7b422b1
DH		 2089}
2090
54ceac45
DH		 2091/*
2092 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2093 */
2094static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2095 const char *dev_name, void *raw_data,
2096 struct vfsmount *mnt)
f7b422b1
DH		 2097{
2098 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2099 struct super_block *s;
2100 struct nfs_server *server;
2101 struct dentry *mntroot;
75180df2 2102 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2103 struct nfs_sb_mountdata sb_mntdata = {
2104 .mntflags = flags,
2105 };
54ceac45 2106 int error;
f7b422b1 2107
54ceac45 2108 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2109
54ceac45
DH		 2110 /* create a new volume representation */
2111 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2112 if (IS_ERR(server)) {
2113 error = PTR_ERR(server);
2114 goto out_err_noserver;
2115 }
e89a5a43 2116 sb_mntdata.server = server;
8fa5c000 2117
75180df2
TM		 2118 if (server->flags & NFS_MOUNT_UNSHARED)
2119 compare_super = NULL;
2120
54ceac45 2121 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2122 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2123 if (IS_ERR(s)) {
2124 error = PTR_ERR(s);
2125 goto out_err_nosb;
2126 }
5006a76c 2127
54ceac45
DH		 2128 if (s->s_fs_info != server) {
2129 nfs_free_server(server);
2130 server = NULL;
fa799759
MS		 2131 } else {
2132 error = nfs_bdi_register(server);
2133 if (error)
2134 goto error_splat_super;
f7b422b1 2135 }
24c8dbbb 2136
54ceac45
DH		 2137 if (!s->s_root) {
2138 /* initial superblock/root creation */
54ceac45
DH		 2139 nfs_clone_super(s, data->sb);
2140 }
f7b422b1 2141
54ceac45
DH		 2142 mntroot = nfs_get_root(s, data->fh);
2143 if (IS_ERR(mntroot)) {
2144 error = PTR_ERR(mntroot);
2145 goto error_splat_super;
f7b422b1 2146 }
e9cc6c23 2147 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2148 dput(mntroot);
2149 error = -ESTALE;
2150 goto error_splat_super;
2151 }
f7b422b1 2152
54ceac45
DH		 2153 s->s_flags |= MS_ACTIVE;
2154 mnt->mnt_sb = s;
2155 mnt->mnt_root = mntroot;
f7b422b1 2156
f9c3a380
EP		 2157 /* clone any lsm security options from the parent to the new sb */
2158 security_sb_clone_mnt_opts(data->sb, s);
2159
54ceac45
DH		 2160 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2161 return 0;
24c8dbbb 2162
54ceac45
DH		 2163out_err_nosb:
2164 nfs_free_server(server);
2165out_err_noserver:
2166 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2167 return error;
f7b422b1 2168
54ceac45
DH		 2169error_splat_super:
2170 up_write(&s->s_umount);
2171 deactivate_super(s);
2172 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2173 return error;
f7b422b1
DH		 2174}
2175
54ceac45
DH		 2176#ifdef CONFIG_NFS_V4
2177
f7b422b1 2178/*
54ceac45 2179 * Finish setting up a cloned NFS4 superblock
f7b422b1 2180 */
54ceac45
DH		 2181static void nfs4_clone_super(struct super_block *sb,
2182 const struct super_block *old_sb)
f7b422b1 2183{
54ceac45
DH		 2184 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2185 sb->s_blocksize = old_sb->s_blocksize;
2186 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2187 sb->s_time_gran = 1;
54ceac45
DH		 2188 sb->s_op = old_sb->s_op;
2189 nfs_initialise_sb(sb);
f7b422b1
DH		 2190}
2191
54ceac45
DH		 2192/*
2193 * Set up an NFS4 superblock
2194 */
2195static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2196{
54ceac45
DH		 2197 sb->s_time_gran = 1;
2198 sb->s_op = &nfs4_sops;
2199 nfs_initialise_sb(sb);
f7b422b1
DH		 2200}
2201
f0768ebd
CL		 2202/*
2203 * Validate NFSv4 mount options
2204 */
91ea40b9
TT		 2205static int nfs4_validate_mount_data(void *options,
2206 struct nfs_parsed_mount_data *args,
2207 const char *dev_name)
f0768ebd 2208{
4c568017 2209 struct sockaddr_in *ap;
91ea40b9 2210 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2211 char *c;
2212
2213 if (data == NULL)
2214 goto out_no_data;
2215
91ea40b9
TT		 2216 args->rsize = NFS_MAX_FILE_IO_SIZE;
2217 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2218 args->acregmin = NFS_DEF_ACREGMIN;
2219 args->acregmax = NFS_DEF_ACREGMAX;
2220 args->acdirmin = NFS_DEF_ACDIRMIN;
2221 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 2222 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
6738b251
CL		 2223 args->auth_flavors[0] = RPC_AUTH_UNIX;
2224 args->auth_flavor_len = 0;
91ea40b9 2225
f0768ebd
CL		 2226 switch (data->version) {
2227 case 1:
4c568017
CL		 2228 ap = (struct sockaddr_in *)&args->nfs_server.address;
2229 if (data->host_addrlen > sizeof(args->nfs_server.address))
2230 goto out_no_address;
2231 if (data->host_addrlen == 0)
f0768ebd 2232 goto out_no_address;
4c568017
CL		 2233 args->nfs_server.addrlen = data->host_addrlen;
2234 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
f0768ebd 2235 return -EFAULT;
91ea40b9
TT		 2236 if (!nfs_verify_server_address((struct sockaddr *)
2237 &args->nfs_server.address))
f0768ebd
CL		 2238 goto out_no_address;
2239
6738b251
CL		 2240 if (data->auth_flavourlen) {
2241 if (data->auth_flavourlen > 1)
2242 goto out_inval_auth;
20c71f5e 2243 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2244 data->auth_flavours,
20c71f5e 2245 sizeof(args->auth_flavors[0])))
f0768ebd 2246 return -EFAULT;
f0768ebd
CL		 2247 }
2248
2249 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2250 if (IS_ERR(c))
2251 return PTR_ERR(c);
91ea40b9 2252 args->nfs_server.hostname = c;
f0768ebd
CL		 2253
2254 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2255 if (IS_ERR(c))
2256 return PTR_ERR(c);
91ea40b9
TT		 2257 args->nfs_server.export_path = c;
2258 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2259
2260 c = strndup_user(data->client_addr.data, 16);
2261 if (IS_ERR(c))
2262 return PTR_ERR(c);
91ea40b9
TT		 2263 args->client_address = c;
2264
2265 /*
2266 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2267 * can deal with.
2268 */
2269
2270 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2271 args->rsize = data->rsize;
2272 args->wsize = data->wsize;
2273 args->timeo = data->timeo;
2274 args->retrans = data->retrans;
2275 args->acregmin = data->acregmin;
2276 args->acregmax = data->acregmax;
2277 args->acdirmin = data->acdirmin;
2278 args->acdirmax = data->acdirmax;
2279 args->nfs_server.protocol = data->proto;
259875ef 2280 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2281
2282 break;
80071225 2283 default: {
dc045898 2284 int status;
91ea40b9
TT		 2285
2286 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2287 return -EINVAL;
2288
2289 if (!nfs_verify_server_address((struct sockaddr *)
91ea40b9 2290 &args->nfs_server.address))
80071225 2291 return -EINVAL;
80071225 2292
ed596a8a
CL		 2293 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2294 args->nfs_server.port);
2295
259875ef
TM		 2296 nfs_validate_transport_protocol(args);
2297
6738b251 2298 if (args->auth_flavor_len > 1)
80071225 2299 goto out_inval_auth;
80071225 2300
91ea40b9 2301 if (args->client_address == NULL)
0a87cf12
JL		 2302 goto out_no_client_address;
2303
dc045898
CL		 2304 status = nfs_parse_devname(dev_name,
2305 &args->nfs_server.hostname,
2306 NFS4_MAXNAMLEN,
2307 &args->nfs_server.export_path,
2308 NFS4_MAXPATHLEN);
2309 if (status < 0)
2310 return status;
2311
80071225
CL		 2312 break;
2313 }
f0768ebd
CL		 2314 }
2315
2316 return 0;
2317
2318out_no_data:
2319 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2320 return -EINVAL;
2321
2322out_inval_auth:
2323 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2324 data->auth_flavourlen);
2325 return -EINVAL;
2326
2327out_no_address:
2328 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2329 return -EINVAL;
0a87cf12
JL		 2330
2331out_no_client_address:
2332 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2333 return -EINVAL;
f0768ebd
CL		 2334}
2335
54ceac45
DH		 2336/*
2337 * Get the superblock for an NFS4 mountpoint
2338 */
816724e6
TM		 2339static int nfs4_get_sb(struct file_system_type *fs_type,
2340 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2341{
33852a1f 2342 struct nfs_parsed_mount_data *data;
54ceac45
DH		 2343 struct super_block *s;
2344 struct nfs_server *server;
33852a1f 2345 struct nfs_fh *mntfh;
54ceac45 2346 struct dentry *mntroot;
75180df2 2347 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2348 struct nfs_sb_mountdata sb_mntdata = {
2349 .mntflags = flags,
2350 };
33852a1f
TM		 2351 int error = -ENOMEM;
2352
2353 data = kzalloc(sizeof(*data), GFP_KERNEL);
2354 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2355 if (data == NULL || mntfh == NULL)
2356 goto out_free_fh;
f7b422b1 2357
33852a1f 2358 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2359
f0768ebd 2360 /* Validate the mount data */
33852a1f 2361 error = nfs4_validate_mount_data(raw_data, data, dev_name);
f0768ebd
CL		 2362 if (error < 0)
2363 goto out;
f7b422b1 2364
54ceac45 2365 /* Get a volume representation */
33852a1f 2366 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2367 if (IS_ERR(server)) {
2368 error = PTR_ERR(server);
29eb981a 2369 goto out;
f7b422b1 2370 }
e89a5a43 2371 sb_mntdata.server = server;
f7b422b1 2372
75180df2
TM		 2373 if (server->flags & NFS4_MOUNT_UNSHARED)
2374 compare_super = NULL;
2375
54ceac45 2376 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2377 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2378 if (IS_ERR(s)) {
2379 error = PTR_ERR(s);
f7b422b1 2380 goto out_free;
816724e6
TM		 2381 }
2382
5dd3177a
TM		 2383 if (s->s_fs_info != server) {
2384 nfs_free_server(server);
2385 server = NULL;
fa799759
MS		 2386 } else {
2387 error = nfs_bdi_register(server);
2388 if (error)
2389 goto error_splat_super;
5dd3177a
TM		 2390 }
2391
54ceac45
DH		 2392 if (!s->s_root) {
2393 /* initial superblock/root creation */
54ceac45 2394 nfs4_fill_super(s);
08734048 2395 nfs_fscache_get_super_cookie(s, data);
54ceac45 2396 }
f7b422b1 2397
33852a1f 2398 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2399 if (IS_ERR(mntroot)) {
2400 error = PTR_ERR(mntroot);
2401 goto error_splat_super;
f7b422b1 2402 }
54ceac45 2403
33852a1f 2404 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2405 if (error)
2406 goto error_splat_root;
2407
f7b422b1 2408 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2409 mnt->mnt_sb = s;
2410 mnt->mnt_root = mntroot;
29eb981a
CL		 2411 error = 0;
2412
2413out:
33852a1f
TM		 2414 kfree(data->client_address);
2415 kfree(data->nfs_server.export_path);
2416 kfree(data->nfs_server.hostname);
08734048 2417 kfree(data->fscache_uniq);
33852a1f
TM		 2418 security_free_mnt_opts(&data->lsm_opts);
2419out_free_fh:
2420 kfree(mntfh);
2421 kfree(data);
29eb981a 2422 return error;
54ceac45 2423
f7b422b1 2424out_free:
54ceac45 2425 nfs_free_server(server);
29eb981a 2426 goto out;
54ceac45 2427
46c8ac74
EP		 2428error_splat_root:
2429 dput(mntroot);
54ceac45
DH		 2430error_splat_super:
2431 up_write(&s->s_umount);
2432 deactivate_super(s);
29eb981a 2433 goto out;
f7b422b1
DH		 2434}
2435
2436static void nfs4_kill_super(struct super_block *sb)
2437{
2438 struct nfs_server *server = NFS_SB(sb);
2439
515d8611 2440 nfs_super_return_all_delegations(sb);
f7b422b1
DH		 2441 kill_anon_super(sb);
2442
2443 nfs4_renewd_prepare_shutdown(server);
08734048 2444 nfs_fscache_release_super_cookie(sb);
54ceac45 2445 nfs_free_server(server);
f7b422b1
DH		 2446}
2447
2448/*
54ceac45 2449 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2450 */
54ceac45
DH		 2451static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2452 const char *dev_name, void *raw_data,
2453 struct vfsmount *mnt)
f7b422b1 2454{
54ceac45
DH		 2455 struct nfs_clone_mount *data = raw_data;
2456 struct super_block *s;
2457 struct nfs_server *server;
2458 struct dentry *mntroot;
75180df2 2459 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2460 struct nfs_sb_mountdata sb_mntdata = {
2461 .mntflags = flags,
2462 };
54ceac45 2463 int error;
f7b422b1 2464
54ceac45 2465 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2466
54ceac45
DH		 2467 /* create a new volume representation */
2468 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2469 if (IS_ERR(server)) {
2470 error = PTR_ERR(server);
2471 goto out_err_noserver;
f7b422b1 2472 }
e89a5a43 2473 sb_mntdata.server = server;
f7b422b1 2474
75180df2
TM		 2475 if (server->flags & NFS4_MOUNT_UNSHARED)
2476 compare_super = NULL;
2477
54ceac45 2478 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2479 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2480 if (IS_ERR(s)) {
2481 error = PTR_ERR(s);
2482 goto out_err_nosb;
f7b422b1 2483 }
f7b422b1 2484
54ceac45
DH		 2485 if (s->s_fs_info != server) {
2486 nfs_free_server(server);
2487 server = NULL;
fa799759
MS		 2488 } else {
2489 error = nfs_bdi_register(server);
2490 if (error)
2491 goto error_splat_super;
54ceac45 2492 }
f7b422b1 2493
54ceac45
DH		 2494 if (!s->s_root) {
2495 /* initial superblock/root creation */
54ceac45
DH		 2496 nfs4_clone_super(s, data->sb);
2497 }
f7b422b1 2498
54ceac45
DH		 2499 mntroot = nfs4_get_root(s, data->fh);
2500 if (IS_ERR(mntroot)) {
2501 error = PTR_ERR(mntroot);
2502 goto error_splat_super;
2503 }
e9cc6c23
TM		 2504 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2505 dput(mntroot);
2506 error = -ESTALE;
2507 goto error_splat_super;
2508 }
f7b422b1 2509
54ceac45
DH		 2510 s->s_flags |= MS_ACTIVE;
2511 mnt->mnt_sb = s;
2512 mnt->mnt_root = mntroot;
2513
46c8ac74
EP		 2514 security_sb_clone_mnt_opts(data->sb, s);
2515
54ceac45
DH		 2516 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2517 return 0;
2518
2519out_err_nosb:
2520 nfs_free_server(server);
2521out_err_noserver:
2522 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2523 return error;
2524
2525error_splat_super:
2526 up_write(&s->s_umount);
2527 deactivate_super(s);
2528 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2529 return error;
f7b422b1
DH		 2530}
2531
54ceac45
DH		 2532/*
2533 * Create an NFS4 server record on referral traversal
2534 */
2535static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2536 const char *dev_name, void *raw_data,
2537 struct vfsmount *mnt)
f7b422b1
DH		 2538{
2539 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2540 struct super_block *s;
2541 struct nfs_server *server;
2542 struct dentry *mntroot;
2543 struct nfs_fh mntfh;
75180df2 2544 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2545 struct nfs_sb_mountdata sb_mntdata = {
2546 .mntflags = flags,
2547 };
54ceac45
DH		 2548 int error;
2549
2550 dprintk("--> nfs4_referral_get_sb()\n");
2551
2552 /* create a new volume representation */
2553 server = nfs4_create_referral_server(data, &mntfh);
2554 if (IS_ERR(server)) {
2555 error = PTR_ERR(server);
2556 goto out_err_noserver;
2557 }
e89a5a43 2558 sb_mntdata.server = server;
54ceac45 2559
75180df2
TM		 2560 if (server->flags & NFS4_MOUNT_UNSHARED)
2561 compare_super = NULL;
2562
54ceac45 2563 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2564 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2565 if (IS_ERR(s)) {
2566 error = PTR_ERR(s);
2567 goto out_err_nosb;
2568 }
2569
2570 if (s->s_fs_info != server) {
2571 nfs_free_server(server);
2572 server = NULL;
fa799759
MS		 2573 } else {
2574 error = nfs_bdi_register(server);
2575 if (error)
2576 goto error_splat_super;
54ceac45
DH		 2577 }
2578
2579 if (!s->s_root) {
2580 /* initial superblock/root creation */
54ceac45
DH		 2581 nfs4_fill_super(s);
2582 }
2583
f2d0d85e 2584 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2585 if (IS_ERR(mntroot)) {
2586 error = PTR_ERR(mntroot);
2587 goto error_splat_super;
2588 }
e9cc6c23
TM		 2589 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2590 dput(mntroot);
2591 error = -ESTALE;
2592 goto error_splat_super;
2593 }
54ceac45
DH		 2594
2595 s->s_flags |= MS_ACTIVE;
2596 mnt->mnt_sb = s;
2597 mnt->mnt_root = mntroot;
2598
46c8ac74
EP		 2599 security_sb_clone_mnt_opts(data->sb, s);
2600
54ceac45
DH		 2601 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2602 return 0;
2603
2604out_err_nosb:
2605 nfs_free_server(server);
2606out_err_noserver:
2607 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2608 return error;
2609
2610error_splat_super:
2611 up_write(&s->s_umount);
2612 deactivate_super(s);
2613 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2614 return error;
f7b422b1
DH		 2615}
2616
54ceac45 2617#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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