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NFS: Add mount options to enable local caching on NFS
[linux-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>
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,
b797cac7 80 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 81
82 /* Mount options that take integer arguments */
83 Opt_port,
84 Opt_rsize, Opt_wsize, Opt_bsize,
85 Opt_timeo, Opt_retrans,
86 Opt_acregmin, Opt_acregmax,
87 Opt_acdirmin, Opt_acdirmax,
88 Opt_actimeo,
89 Opt_namelen,
90 Opt_mountport,
e887cbcf 91 Opt_mountvers,
ad879cef 92 Opt_nfsvers,
bf0fd768
CL		 93
94 /* Mount options that take string arguments */
33832034 95 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 96 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 97 Opt_lookupcache,
b797cac7 98 Opt_fscache_uniq,
bf0fd768 99
f45663ce
CL		 100 /* Special mount options */
101 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 102
103 Opt_err
104};
105
a447c093 106static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 107 { Opt_userspace, "bg" },
108 { Opt_userspace, "fg" },
ecbb3845
CL		 109 { Opt_userspace, "retry=%s" },
110
f45663ce
CL		 111 { Opt_sloppy, "sloppy" },
112
bf0fd768
CL		 113 { Opt_soft, "soft" },
114 { Opt_hard, "hard" },
d33e4dfe
CL		 115 { Opt_deprecated, "intr" },
116 { Opt_deprecated, "nointr" },
bf0fd768
CL		 117 { Opt_posix, "posix" },
118 { Opt_noposix, "noposix" },
119 { Opt_cto, "cto" },
120 { Opt_nocto, "nocto" },
121 { Opt_ac, "ac" },
122 { Opt_noac, "noac" },
123 { Opt_lock, "lock" },
124 { Opt_nolock, "nolock" },
125 { Opt_v2, "v2" },
126 { Opt_v3, "v3" },
127 { Opt_udp, "udp" },
128 { Opt_tcp, "tcp" },
2cf7ff7a 129 { Opt_rdma, "rdma" },
bf0fd768
CL		 130 { Opt_acl, "acl" },
131 { Opt_noacl, "noacl" },
132 { Opt_rdirplus, "rdirplus" },
133 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 134 { Opt_sharecache, "sharecache" },
135 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 136 { Opt_resvport, "resvport" },
137 { Opt_noresvport, "noresvport" },
b797cac7
DH		 138 { Opt_fscache, "fsc" },
139 { Opt_fscache_uniq, "fsc=%s" },
140 { Opt_nofscache, "nofsc" },
bf0fd768
CL		 141
142 { Opt_port, "port=%u" },
143 { Opt_rsize, "rsize=%u" },
144 { Opt_wsize, "wsize=%u" },
145 { Opt_bsize, "bsize=%u" },
146 { Opt_timeo, "timeo=%u" },
147 { Opt_retrans, "retrans=%u" },
148 { Opt_acregmin, "acregmin=%u" },
149 { Opt_acregmax, "acregmax=%u" },
150 { Opt_acdirmin, "acdirmin=%u" },
151 { Opt_acdirmax, "acdirmax=%u" },
152 { Opt_actimeo, "actimeo=%u" },
bf0fd768
CL		 153 { Opt_namelen, "namlen=%u" },
154 { Opt_mountport, "mountport=%u" },
bf0fd768 155 { Opt_mountvers, "mountvers=%u" },
bf0fd768
CL		 156 { Opt_nfsvers, "nfsvers=%u" },
157 { Opt_nfsvers, "vers=%u" },
158
159 { Opt_sec, "sec=%s" },
160 { Opt_proto, "proto=%s" },
161 { Opt_mountproto, "mountproto=%s" },
162 { Opt_addr, "addr=%s" },
163 { Opt_clientaddr, "clientaddr=%s" },
33832034 164 { Opt_mounthost, "mounthost=%s" },
0ac83779 165 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 166
7973c1f1
TM		 167 { Opt_lookupcache, "lookupcache=%s" },
168
bf0fd768
CL		 169 { Opt_err, NULL }
170};
171
172enum {
2cf7ff7a 173 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 174
175 Opt_xprt_err
176};
177
a447c093 178static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768
CL		 179 { Opt_xprt_udp, "udp" },
180 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 181 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 182
183 { Opt_xprt_err, NULL }
184};
185
186enum {
187 Opt_sec_none, Opt_sec_sys,
188 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
189 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
190 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
191
192 Opt_sec_err
193};
194
a447c093 195static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 196 { Opt_sec_none, "none" },
197 { Opt_sec_none, "null" },
198 { Opt_sec_sys, "sys" },
199
200 { Opt_sec_krb5, "krb5" },
201 { Opt_sec_krb5i, "krb5i" },
202 { Opt_sec_krb5p, "krb5p" },
203
204 { Opt_sec_lkey, "lkey" },
205 { Opt_sec_lkeyi, "lkeyi" },
206 { Opt_sec_lkeyp, "lkeyp" },
207
8d042218
OK		 208 { Opt_sec_spkm, "spkm3" },
209 { Opt_sec_spkmi, "spkm3i" },
210 { Opt_sec_spkmp, "spkm3p" },
211
bf0fd768
CL		 212 { Opt_sec_err, NULL }
213};
214
7973c1f1
TM		 215enum {
216 Opt_lookupcache_all, Opt_lookupcache_positive,
217 Opt_lookupcache_none,
218
219 Opt_lookupcache_err
220};
221
222static match_table_t nfs_lookupcache_tokens = {
223 { Opt_lookupcache_all, "all" },
224 { Opt_lookupcache_positive, "pos" },
225 { Opt_lookupcache_positive, "positive" },
226 { Opt_lookupcache_none, "none" },
227
228 { Opt_lookupcache_err, NULL }
229};
230
bf0fd768 231
42faad99 232static void nfs_umount_begin(struct super_block *);
816724e6 233static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 234static int nfs_show_options(struct seq_file *, struct vfsmount *);
235static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 236static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 237static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 238 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1 239static void nfs_kill_super(struct super_block *);
48b605f8 240static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 241
242static struct file_system_type nfs_fs_type = {
243 .owner = THIS_MODULE,
244 .name = "nfs",
245 .get_sb = nfs_get_sb,
246 .kill_sb = nfs_kill_super,
349457cc 247 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 248};
249
54ceac45 250struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 251 .owner = THIS_MODULE,
252 .name = "nfs",
54ceac45 253 .get_sb = nfs_xdev_get_sb,
f7b422b1 254 .kill_sb = nfs_kill_super,
349457cc 255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 256};
257
ee9b6d61 258static const struct super_operations nfs_sops = {
f7b422b1
DH		 259 .alloc_inode = nfs_alloc_inode,
260 .destroy_inode = nfs_destroy_inode,
261 .write_inode = nfs_write_inode,
262 .statfs = nfs_statfs,
263 .clear_inode = nfs_clear_inode,
264 .umount_begin = nfs_umount_begin,
265 .show_options = nfs_show_options,
266 .show_stats = nfs_show_stats,
48b605f8 267 .remount_fs = nfs_remount,
f7b422b1
DH		 268};
269
270#ifdef CONFIG_NFS_V4
816724e6
TM		 271static int nfs4_get_sb(struct file_system_type *fs_type,
272 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 273static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
274 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
275static int nfs4_referral_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 277static void nfs4_kill_super(struct super_block *sb);
278
279static struct file_system_type nfs4_fs_type = {
280 .owner = THIS_MODULE,
281 .name = "nfs4",
282 .get_sb = nfs4_get_sb,
283 .kill_sb = nfs4_kill_super,
349457cc 284 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 285};
286
54ceac45 287struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 288 .owner = THIS_MODULE,
289 .name = "nfs4",
54ceac45 290 .get_sb = nfs4_xdev_get_sb,
f7b422b1 291 .kill_sb = nfs4_kill_super,
349457cc 292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 293};
294
54ceac45 295struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 296 .owner = THIS_MODULE,
297 .name = "nfs4",
54ceac45 298 .get_sb = nfs4_referral_get_sb,
f7b422b1 299 .kill_sb = nfs4_kill_super,
349457cc 300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 301};
302
ee9b6d61 303static const struct super_operations nfs4_sops = {
f7b422b1
DH		 304 .alloc_inode = nfs_alloc_inode,
305 .destroy_inode = nfs_destroy_inode,
306 .write_inode = nfs_write_inode,
307 .statfs = nfs_statfs,
308 .clear_inode = nfs4_clear_inode,
309 .umount_begin = nfs_umount_begin,
310 .show_options = nfs_show_options,
311 .show_stats = nfs_show_stats,
48b605f8 312 .remount_fs = nfs_remount,
f7b422b1
DH		 313};
314#endif
315
8e1f936b
RR		 316static struct shrinker acl_shrinker = {
317 .shrink = nfs_access_cache_shrinker,
318 .seeks = DEFAULT_SEEKS,
319};
979df72e 320
f7b422b1
DH		 321/*
322 * Register the NFS filesystems
323 */
324int __init register_nfs_fs(void)
325{
326 int ret;
327
328 ret = register_filesystem(&nfs_fs_type);
329 if (ret < 0)
330 goto error_0;
331
f7b422b1
DH		 332 ret = nfs_register_sysctl();
333 if (ret < 0)
334 goto error_1;
89a09141 335#ifdef CONFIG_NFS_V4
f7b422b1
DH		 336 ret = register_filesystem(&nfs4_fs_type);
337 if (ret < 0)
338 goto error_2;
339#endif
8e1f936b 340 register_shrinker(&acl_shrinker);
f7b422b1
DH		 341 return 0;
342
343#ifdef CONFIG_NFS_V4
344error_2:
345 nfs_unregister_sysctl();
89a09141 346#endif
f7b422b1
DH		 347error_1:
348 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 349error_0:
350 return ret;
351}
352
353/*
354 * Unregister the NFS filesystems
355 */
356void __exit unregister_nfs_fs(void)
357{
8e1f936b 358 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 359#ifdef CONFIG_NFS_V4
360 unregister_filesystem(&nfs4_fs_type);
f7b422b1 361#endif
49af7ee1 362 nfs_unregister_sysctl();
f7b422b1
DH		 363 unregister_filesystem(&nfs_fs_type);
364}
365
1daef0a8 366void nfs_sb_active(struct super_block *sb)
ef818a28 367{
1daef0a8 368 struct nfs_server *server = NFS_SB(sb);
ef818a28 369
1daef0a8
TM		 370 if (atomic_inc_return(&server->active) == 1)
371 atomic_inc(&sb->s_active);
ef818a28
SD		 372}
373
1daef0a8 374void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 375{
376 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 377
378 if (atomic_dec_and_test(&server->active))
379 deactivate_super(sb);
ef818a28
SD		 380}
381
f7b422b1
DH		 382/*
383 * Deliver file system statistics to userspace
384 */
816724e6 385static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 386{
0c7d90cf 387 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 388 unsigned char blockbits;
389 unsigned long blockres;
0c7d90cf 390 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 391 struct nfs_fattr fattr;
392 struct nfs_fsstat res = {
393 .fattr = &fattr,
394 };
395 int error;
396
8fa5c000 397 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 398 if (error < 0)
399 goto out_err;
1a0ba9ae 400 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 401
402 /*
403 * Current versions of glibc do not correctly handle the
404 * case where f_frsize != f_bsize. Eventually we want to
405 * report the value of wtmult in this field.
406 */
0c7d90cf 407 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 408
409 /*
410 * On most *nix systems, f_blocks, f_bfree, and f_bavail
411 * are reported in units of f_frsize. Linux hasn't had
412 * an f_frsize field in its statfs struct until recently,
413 * thus historically Linux's sys_statfs reports these
414 * fields in units of f_bsize.
415 */
0c7d90cf
DH		 416 buf->f_bsize = dentry->d_sb->s_blocksize;
417 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 418 blockres = (1 << blockbits) - 1;
419 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
420 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
421 buf->f_bavail = (res.abytes + blockres) >> blockbits;
422
423 buf->f_files = res.tfiles;
424 buf->f_ffree = res.afiles;
425
426 buf->f_namelen = server->namelen;
1a0ba9ae 427
f7b422b1
DH		 428 return 0;
429
430 out_err:
3110ff80 431 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 432 return error;
f7b422b1
DH		 433}
434
7d4e2747
DH		 435/*
436 * Map the security flavour number to a name
437 */
81039f1f
TM		 438static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
439{
7d4e2747 440 static const struct {
81039f1f
TM		 441 rpc_authflavor_t flavour;
442 const char *str;
443 } sec_flavours[] = {
444 { RPC_AUTH_NULL, "null" },
445 { RPC_AUTH_UNIX, "sys" },
446 { RPC_AUTH_GSS_KRB5, "krb5" },
447 { RPC_AUTH_GSS_KRB5I, "krb5i" },
448 { RPC_AUTH_GSS_KRB5P, "krb5p" },
449 { RPC_AUTH_GSS_LKEY, "lkey" },
450 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
451 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
452 { RPC_AUTH_GSS_SPKM, "spkm" },
453 { RPC_AUTH_GSS_SPKMI, "spkmi" },
454 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 455 { UINT_MAX, "unknown" }
81039f1f
TM		 456 };
457 int i;
458
4d81cd16 459 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 460 if (sec_flavours[i].flavour == flavour)
461 break;
462 }
463 return sec_flavours[i].str;
464}
465
82d101d5
CL		 466static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
467 int showdefaults)
468{
469 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
470
471 switch (sap->sa_family) {
472 case AF_INET: {
473 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 474 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 475 break;
476 }
477 case AF_INET6: {
478 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
5b095d98 479 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
82d101d5
CL		 480 break;
481 }
482 default:
483 if (showdefaults)
484 seq_printf(m, ",mountaddr=unspecified");
485 }
486
487 if (nfss->mountd_version || showdefaults)
488 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
489 if (nfss->mountd_port || showdefaults)
490 seq_printf(m, ",mountport=%u", nfss->mountd_port);
491
492 switch (nfss->mountd_protocol) {
493 case IPPROTO_UDP:
494 seq_printf(m, ",mountproto=udp");
495 break;
496 case IPPROTO_TCP:
497 seq_printf(m, ",mountproto=tcp");
498 break;
499 default:
500 if (showdefaults)
501 seq_printf(m, ",mountproto=auto");
502 }
503}
504
f7b422b1
DH		 505/*
506 * Describe the mount options in force on this server representation
507 */
82d101d5
CL		 508static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
509 int showdefaults)
f7b422b1 510{
509de811 511 static const struct proc_nfs_info {
f7b422b1 512 int flag;
509de811
DH		 513 const char *str;
514 const char *nostr;
f7b422b1
DH		 515 } nfs_info[] = {
516 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5
CL		 517 { NFS_MOUNT_INTR, ",intr", ",nointr" },
518 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 519 { NFS_MOUNT_NOCTO, ",nocto", "" },
520 { NFS_MOUNT_NOAC, ",noac", "" },
521 { NFS_MOUNT_NONLM, ",nolock", "" },
522 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 523 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 524 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
525 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 526 { 0, NULL, NULL }
527 };
509de811 528 const struct proc_nfs_info *nfs_infop;
8fa5c000 529 struct nfs_client *clp = nfss->nfs_client;
82d101d5 530 u32 version = clp->rpc_ops->version;
f7b422b1 531
82d101d5 532 seq_printf(m, ",vers=%u", version);
2d767432
CL		 533 seq_printf(m, ",rsize=%u", nfss->rsize);
534 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 535 if (nfss->bsize != 0)
536 seq_printf(m, ",bsize=%u", nfss->bsize);
537 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 538 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 539 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 540 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 541 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 542 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 543 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 544 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 545 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 546 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
547 if (nfss->flags & nfs_infop->flag)
548 seq_puts(m, nfs_infop->str);
549 else
550 seq_puts(m, nfs_infop->nostr);
551 }
56928edd
TT		 552 seq_printf(m, ",proto=%s",
553 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 554 if (version == 4) {
555 if (nfss->port != NFS_PORT)
556 seq_printf(m, ",port=%u", nfss->port);
557 } else
558 if (nfss->port)
559 seq_printf(m, ",port=%u", nfss->port);
560
33170233
TM		 561 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
562 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 563 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 564
565 if (version != 4)
566 nfs_show_mountd_options(m, nfss, showdefaults);
567
568#ifdef CONFIG_NFS_V4
569 if (clp->rpc_ops->version == 4)
570 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
571#endif
b797cac7
DH		 572 if (nfss->options & NFS_OPTION_FSCACHE)
573 seq_printf(m, ",fsc");
f7b422b1
DH		 574}
575
576/*
577 * Describe the mount options on this VFS mountpoint
578 */
579static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
580{
581 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
582
583 nfs_show_mount_options(m, nfss, 0);
584
5d8515ca
CL		 585 seq_printf(m, ",addr=%s",
586 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
587 RPC_DISPLAY_ADDR));
f7b422b1
DH		 588
589 return 0;
590}
591
592/*
593 * Present statistical information for this VFS mountpoint
594 */
595static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
596{
597 int i, cpu;
598 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
599 struct rpc_auth *auth = nfss->client->cl_auth;
600 struct nfs_iostats totals = { };
601
602 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
603
604 /*
605 * Display all mount option settings
606 */
607 seq_printf(m, "\n\topts:\t");
608 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
609 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
610 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
611 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
612 nfs_show_mount_options(m, nfss, 1);
613
614 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
615
616 seq_printf(m, "\n\tcaps:\t");
617 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 618 seq_printf(m, ",wtmult=%u", nfss->wtmult);
619 seq_printf(m, ",dtsize=%u", nfss->dtsize);
620 seq_printf(m, ",bsize=%u", nfss->bsize);
621 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 622
623#ifdef CONFIG_NFS_V4
40c55319 624 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 625 seq_printf(m, "\n\tnfsv4:\t");
626 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
627 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
628 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
629 }
630#endif
631
632 /*
633 * Display security flavor in effect for this mount
634 */
2d767432 635 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 636 if (auth->au_flavor)
2d767432 637 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 638
639 /*
640 * Display superblock I/O counters
641 */
642 for_each_possible_cpu(cpu) {
643 struct nfs_iostats *stats;
644
645 preempt_disable();
646 stats = per_cpu_ptr(nfss->io_stats, cpu);
647
648 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
649 totals.events[i] += stats->events[i];
650 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
651 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 652#ifdef CONFIG_NFS_FSCACHE
653 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
654 totals.fscache[i] += stats->fscache[i];
655#endif
f7b422b1
DH		 656
657 preempt_enable();
658 }
659
660 seq_printf(m, "\n\tevents:\t");
661 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
662 seq_printf(m, "%lu ", totals.events[i]);
663 seq_printf(m, "\n\tbytes:\t");
664 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
665 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 666#ifdef CONFIG_NFS_FSCACHE
667 if (nfss->options & NFS_OPTION_FSCACHE) {
668 seq_printf(m, "\n\tfsc:\t");
669 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
670 seq_printf(m, "%Lu ", totals.bytes[i]);
671 }
672#endif
f7b422b1
DH		 673 seq_printf(m, "\n");
674
675 rpc_print_iostats(m, nfss->client);
676
677 return 0;
678}
679
680/*
681 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 682 * in response to xdev traversals and referrals
f7b422b1 683 */
42faad99 684static void nfs_umount_begin(struct super_block *sb)
f7b422b1 685{
42faad99 686 struct nfs_server *server = NFS_SB(sb);
fc6ae3cf
TM		 687 struct rpc_clnt *rpc;
688
fc6ae3cf
TM		 689 /* -EIO all pending I/O */
690 rpc = server->client_acl;
691 if (!IS_ERR(rpc))
692 rpc_killall_tasks(rpc);
693 rpc = server->client;
694 if (!IS_ERR(rpc))
695 rpc_killall_tasks(rpc);
f7b422b1
DH		 696}
697
fc50d58f 698/*
cdcd7f9a
CL		 699 * Sanity-check a server address provided by the mount command.
700 *
701 * Address family must be initialized, and address must not be
702 * the ANY address for that family.
fc50d58f
CL		 703 */
704static int nfs_verify_server_address(struct sockaddr *addr)
705{
706 switch (addr->sa_family) {
707 case AF_INET: {
cdcd7f9a 708 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 709 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 710 }
711 case AF_INET6: {
712 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
713 return !ipv6_addr_any(sa);
fc50d58f
CL		 714 }
715 }
716
717 return 0;
718}
719
ce3b7e19
CL		 720static void nfs_parse_ipv4_address(char *string, size_t str_len,
721 struct sockaddr *sap, size_t *addr_len)
9412b927 722{
ce3b7e19
CL		 723 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
724 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
9412b927 725
ce3b7e19
CL		 726 if (str_len <= INET_ADDRSTRLEN) {
727 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
728 (int)str_len, string);
729
730 sin->sin_family = AF_INET;
731 *addr_len = sizeof(*sin);
732 if (in4_pton(string, str_len, addr, '\0', NULL))
3c7c7e48 733 return;
ce3b7e19
CL		 734 }
735
736 sap->sa_family = AF_UNSPEC;
737 *addr_len = 0;
738}
739
740#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5e2e7721
CL		 741static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
742 const char *delim,
743 struct sockaddr_in6 *sin6)
d8e7748a
CL		 744{
745 char *p;
746 size_t len;
747
5e2e7721
CL		 748 if ((string + str_len) == delim)
749 return 1;
750
d8e7748a 751 if (*delim != IPV6_SCOPE_DELIMITER)
5e2e7721
CL		 752 return 0;
753
754 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
755 return 0;
d8e7748a
CL		 756
757 len = (string + str_len) - delim - 1;
758 p = kstrndup(delim + 1, len, GFP_KERNEL);
759 if (p) {
760 unsigned long scope_id = 0;
761 struct net_device *dev;
762
763 dev = dev_get_by_name(&init_net, p);
764 if (dev != NULL) {
765 scope_id = dev->ifindex;
766 dev_put(dev);
767 } else {
5e2e7721
CL		 768 if (strict_strtoul(p, 10, &scope_id) == 0) {
769 kfree(p);
770 return 0;
771 }
d8e7748a
CL		 772 }
773
774 kfree(p);
5e2e7721 775
d8e7748a
CL		 776 sin6->sin6_scope_id = scope_id;
777 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
5e2e7721 778 return 1;
d8e7748a 779 }
5e2e7721
CL		 780
781 return 0;
d8e7748a
CL		 782}
783
ce3b7e19
CL		 784static void nfs_parse_ipv6_address(char *string, size_t str_len,
785 struct sockaddr *sap, size_t *addr_len)
786{
787 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
788 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
d8e7748a 789 const char *delim;
ce3b7e19
CL		 790
791 if (str_len <= INET6_ADDRSTRLEN) {
792 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
793 (int)str_len, string);
3c7c7e48 794
ce3b7e19
CL		 795 sin6->sin6_family = AF_INET6;
796 *addr_len = sizeof(*sin6);
5e2e7721
CL		 797 if (in6_pton(string, str_len, addr,
798 IPV6_SCOPE_DELIMITER, &delim) != 0) {
799 if (nfs_parse_ipv6_scope_id(string, str_len,
800 delim, sin6) != 0)
801 return;
d8e7748a 802 }
3c7c7e48 803 }
9412b927
CL		 804
805 sap->sa_family = AF_UNSPEC;
ce3b7e19
CL		 806 *addr_len = 0;
807}
808#else
809static void nfs_parse_ipv6_address(char *string, size_t str_len,
810 struct sockaddr *sap, size_t *addr_len)
811{
812 sap->sa_family = AF_UNSPEC;
813 *addr_len = 0;
814}
815#endif
816
817/*
818 * Construct a sockaddr based on the contents of a string that contains
819 * an IP address in presentation format.
820 *
821 * If there is a problem constructing the new sockaddr, set the address
822 * family to AF_UNSPEC.
823 */
ea31a443 824void nfs_parse_ip_address(char *string, size_t str_len,
ce3b7e19
CL		 825 struct sockaddr *sap, size_t *addr_len)
826{
827 unsigned int i, colons;
828
829 colons = 0;
830 for (i = 0; i < str_len; i++)
831 if (string[i] == ':')
832 colons++;
833
834 if (colons >= 2)
835 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
836 else
837 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
9412b927
CL		 838}
839
259875ef
TM		 840/*
841 * Sanity check the NFS transport protocol.
842 *
843 */
844static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
845{
846 switch (mnt->nfs_server.protocol) {
847 case XPRT_TRANSPORT_UDP:
848 case XPRT_TRANSPORT_TCP:
849 case XPRT_TRANSPORT_RDMA:
850 break;
851 default:
852 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
853 }
854}
855
856/*
857 * For text based NFSv2/v3 mounts, the mount protocol transport default
858 * settings should depend upon the specified NFS transport.
859 */
860static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
861{
862 nfs_validate_transport_protocol(mnt);
863
864 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
865 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
866 return;
867 switch (mnt->nfs_server.protocol) {
868 case XPRT_TRANSPORT_UDP:
869 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
870 break;
871 case XPRT_TRANSPORT_TCP:
872 case XPRT_TRANSPORT_RDMA:
873 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
874 }
875}
876
01060c89
CL		 877/*
878 * Parse the value of the 'sec=' option.
879 *
dd07c947 880 * The flavor_len setting is for v4 mounts.
01060c89
CL		 881 */
882static int nfs_parse_security_flavors(char *value,
883 struct nfs_parsed_mount_data *mnt)
884{
885 substring_t args[MAX_OPT_ARGS];
886
887 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
888
889 switch (match_token(value, nfs_secflavor_tokens, args)) {
890 case Opt_sec_none:
01060c89
CL		 891 mnt->auth_flavor_len = 0;
892 mnt->auth_flavors[0] = RPC_AUTH_NULL;
893 break;
894 case Opt_sec_sys:
01060c89
CL		 895 mnt->auth_flavor_len = 0;
896 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
897 break;
898 case Opt_sec_krb5:
01060c89
CL		 899 mnt->auth_flavor_len = 1;
900 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
901 break;
902 case Opt_sec_krb5i:
01060c89
CL		 903 mnt->auth_flavor_len = 1;
904 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
905 break;
906 case Opt_sec_krb5p:
01060c89
CL		 907 mnt->auth_flavor_len = 1;
908 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
909 break;
910 case Opt_sec_lkey:
01060c89
CL		 911 mnt->auth_flavor_len = 1;
912 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
913 break;
914 case Opt_sec_lkeyi:
01060c89
CL		 915 mnt->auth_flavor_len = 1;
916 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
917 break;
918 case Opt_sec_lkeyp:
01060c89
CL		 919 mnt->auth_flavor_len = 1;
920 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
921 break;
922 case Opt_sec_spkm:
01060c89
CL		 923 mnt->auth_flavor_len = 1;
924 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
925 break;
926 case Opt_sec_spkmi:
01060c89
CL		 927 mnt->auth_flavor_len = 1;
928 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
929 break;
930 case Opt_sec_spkmp:
01060c89
CL		 931 mnt->auth_flavor_len = 1;
932 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
933 break;
934 default:
935 return 0;
936 }
937
938 return 1;
939}
940
f45663ce
CL		 941static void nfs_parse_invalid_value(const char *option)
942{
943 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
944}
945
bf0fd768
CL		 946/*
947 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 948 * a data structure. The whole mount string is processed; bad options are
949 * skipped as they are encountered. If there were no errors, return 1;
950 * otherwise return 0 (zero).
bf0fd768
CL		 951 */
952static int nfs_parse_mount_options(char *raw,
953 struct nfs_parsed_mount_data *mnt)
954{
f9c3a380 955 char *p, *string, *secdata;
f45663ce 956 int rc, sloppy = 0, errors = 0;
bf0fd768
CL		 957
958 if (!raw) {
959 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
960 return 1;
961 }
962 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
963
f9c3a380
EP		 964 secdata = alloc_secdata();
965 if (!secdata)
966 goto out_nomem;
967
968 rc = security_sb_copy_data(raw, secdata);
969 if (rc)
970 goto out_security_failure;
971
972 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
973 if (rc)
974 goto out_security_failure;
975
976 free_secdata(secdata);
977
bf0fd768
CL		 978 while ((p = strsep(&raw, ",")) != NULL) {
979 substring_t args[MAX_OPT_ARGS];
980 int option, token;
981
982 if (!*p)
983 continue;
984
985 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
986
987 token = match_token(p, nfs_mount_option_tokens, args);
988 switch (token) {
f45663ce
CL		 989
990 /*
991 * boolean options: foo/nofoo
992 */
bf0fd768
CL		 993 case Opt_soft:
994 mnt->flags |= NFS_MOUNT_SOFT;
995 break;
996 case Opt_hard:
997 mnt->flags &= ~NFS_MOUNT_SOFT;
998 break;
bf0fd768
CL		 999 case Opt_posix:
1000 mnt->flags |= NFS_MOUNT_POSIX;
1001 break;
1002 case Opt_noposix:
1003 mnt->flags &= ~NFS_MOUNT_POSIX;
1004 break;
1005 case Opt_cto:
1006 mnt->flags &= ~NFS_MOUNT_NOCTO;
1007 break;
1008 case Opt_nocto:
1009 mnt->flags |= NFS_MOUNT_NOCTO;
1010 break;
1011 case Opt_ac:
1012 mnt->flags &= ~NFS_MOUNT_NOAC;
1013 break;
1014 case Opt_noac:
1015 mnt->flags |= NFS_MOUNT_NOAC;
1016 break;
1017 case Opt_lock:
1018 mnt->flags &= ~NFS_MOUNT_NONLM;
1019 break;
1020 case Opt_nolock:
1021 mnt->flags |= NFS_MOUNT_NONLM;
1022 break;
1023 case Opt_v2:
1024 mnt->flags &= ~NFS_MOUNT_VER3;
1025 break;
1026 case Opt_v3:
1027 mnt->flags |= NFS_MOUNT_VER3;
1028 break;
1029 case Opt_udp:
1030 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1031 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1032 break;
1033 case Opt_tcp:
1034 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1035 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1036 break;
2cf7ff7a
TT		 1037 case Opt_rdma:
1038 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1039 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1040 xprt_load_transport(p);
2cf7ff7a 1041 break;
bf0fd768
CL		 1042 case Opt_acl:
1043 mnt->flags &= ~NFS_MOUNT_NOACL;
1044 break;
1045 case Opt_noacl:
1046 mnt->flags |= NFS_MOUNT_NOACL;
1047 break;
1048 case Opt_rdirplus:
1049 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1050 break;
1051 case Opt_nordirplus:
1052 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1053 break;
75180df2
TM		 1054 case Opt_sharecache:
1055 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1056 break;
1057 case Opt_nosharecache:
1058 mnt->flags |= NFS_MOUNT_UNSHARED;
1059 break;
d740351b
CL		 1060 case Opt_resvport:
1061 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1062 break;
1063 case Opt_noresvport:
1064 mnt->flags |= NFS_MOUNT_NORESVPORT;
1065 break;
b797cac7
DH		 1066 case Opt_fscache:
1067 mnt->options |= NFS_OPTION_FSCACHE;
1068 kfree(mnt->fscache_uniq);
1069 mnt->fscache_uniq = NULL;
1070 break;
1071 case Opt_nofscache:
1072 mnt->options &= ~NFS_OPTION_FSCACHE;
1073 kfree(mnt->fscache_uniq);
1074 mnt->fscache_uniq = NULL;
1075 break;
1076 case Opt_fscache_uniq:
1077 string = match_strdup(args);
1078 if (!string)
1079 goto out_nomem;
1080 kfree(mnt->fscache_uniq);
1081 mnt->fscache_uniq = string;
1082 mnt->options |= NFS_OPTION_FSCACHE;
1083 break;
bf0fd768 1084
f45663ce
CL		 1085 /*
1086 * options that take numeric values
1087 */
bf0fd768 1088 case Opt_port:
f45663ce
CL		 1089 if (match_int(args, &option) ||
1090 option < 0 || option > USHORT_MAX) {
1091 errors++;
1092 nfs_parse_invalid_value("port");
1093 } else
1094 mnt->nfs_server.port = option;
bf0fd768
CL		 1095 break;
1096 case Opt_rsize:
f45663ce
CL		 1097 if (match_int(args, &option) || option < 0) {
1098 errors++;
1099 nfs_parse_invalid_value("rsize");
1100 } else
1101 mnt->rsize = option;
bf0fd768
CL		 1102 break;
1103 case Opt_wsize:
f45663ce
CL		 1104 if (match_int(args, &option) || option < 0) {
1105 errors++;
1106 nfs_parse_invalid_value("wsize");
1107 } else
1108 mnt->wsize = option;
bf0fd768
CL		 1109 break;
1110 case Opt_bsize:
f45663ce
CL		 1111 if (match_int(args, &option) || option < 0) {
1112 errors++;
1113 nfs_parse_invalid_value("bsize");
1114 } else
1115 mnt->bsize = option;
bf0fd768
CL		 1116 break;
1117 case Opt_timeo:
f45663ce
CL		 1118 if (match_int(args, &option) || option <= 0) {
1119 errors++;
1120 nfs_parse_invalid_value("timeo");
1121 } else
1122 mnt->timeo = option;
bf0fd768
CL		 1123 break;
1124 case Opt_retrans:
f45663ce
CL		 1125 if (match_int(args, &option) || option <= 0) {
1126 errors++;
1127 nfs_parse_invalid_value("retrans");
1128 } else
1129 mnt->retrans = option;
bf0fd768
CL		 1130 break;
1131 case Opt_acregmin:
f45663ce
CL		 1132 if (match_int(args, &option) || option < 0) {
1133 errors++;
1134 nfs_parse_invalid_value("acregmin");
1135 } else
1136 mnt->acregmin = option;
bf0fd768
CL		 1137 break;
1138 case Opt_acregmax:
f45663ce
CL		 1139 if (match_int(args, &option) || option < 0) {
1140 errors++;
1141 nfs_parse_invalid_value("acregmax");
1142 } else
1143 mnt->acregmax = option;
bf0fd768
CL		 1144 break;
1145 case Opt_acdirmin:
f45663ce
CL		 1146 if (match_int(args, &option) || option < 0) {
1147 errors++;
1148 nfs_parse_invalid_value("acdirmin");
1149 } else
1150 mnt->acdirmin = option;
bf0fd768
CL		 1151 break;
1152 case Opt_acdirmax:
f45663ce
CL		 1153 if (match_int(args, &option) || option < 0) {
1154 errors++;
1155 nfs_parse_invalid_value("acdirmax");
1156 } else
1157 mnt->acdirmax = option;
bf0fd768
CL		 1158 break;
1159 case Opt_actimeo:
f45663ce
CL		 1160 if (match_int(args, &option) || option < 0) {
1161 errors++;
1162 nfs_parse_invalid_value("actimeo");
1163 } else
1164 mnt->acregmin = mnt->acregmax =
1165 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1166 break;
1167 case Opt_namelen:
f45663ce
CL		 1168 if (match_int(args, &option) || option < 0) {
1169 errors++;
1170 nfs_parse_invalid_value("namlen");
1171 } else
1172 mnt->namlen = option;
bf0fd768
CL		 1173 break;
1174 case Opt_mountport:
f45663ce
CL		 1175 if (match_int(args, &option) ||
1176 option < 0 || option > USHORT_MAX) {
1177 errors++;
1178 nfs_parse_invalid_value("mountport");
1179 } else
1180 mnt->mount_server.port = option;
bf0fd768 1181 break;
bf0fd768 1182 case Opt_mountvers:
f45663ce
CL		 1183 if (match_int(args, &option) ||
1184 option < NFS_MNT_VERSION ||
1185 option > NFS_MNT3_VERSION) {
1186 errors++;
1187 nfs_parse_invalid_value("mountvers");
1188 } else
1189 mnt->mount_server.version = option;
bf0fd768 1190 break;
bf0fd768 1191 case Opt_nfsvers:
f45663ce
CL		 1192 if (match_int(args, &option)) {
1193 errors++;
1194 nfs_parse_invalid_value("nfsvers");
1195 break;
1196 }
bf0fd768 1197 switch (option) {
f45663ce 1198 case NFS2_VERSION:
bf0fd768
CL		 1199 mnt->flags &= ~NFS_MOUNT_VER3;
1200 break;
f45663ce 1201 case NFS3_VERSION:
bf0fd768
CL		 1202 mnt->flags |= NFS_MOUNT_VER3;
1203 break;
1204 default:
f45663ce
CL		 1205 errors++;
1206 nfs_parse_invalid_value("nfsvers");
bf0fd768
CL		 1207 }
1208 break;
1209
f45663ce
CL		 1210 /*
1211 * options that take text values
1212 */
bf0fd768
CL		 1213 case Opt_sec:
1214 string = match_strdup(args);
1215 if (string == NULL)
1216 goto out_nomem;
01060c89 1217 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1218 kfree(string);
f45663ce
CL		 1219 if (!rc) {
1220 errors++;
1221 dfprintk(MOUNT, "NFS: unrecognized "
1222 "security flavor\n");
1223 }
bf0fd768
CL		 1224 break;
1225 case Opt_proto:
1226 string = match_strdup(args);
1227 if (string == NULL)
1228 goto out_nomem;
1229 token = match_token(string,
1230 nfs_xprt_protocol_tokens, args);
1231 kfree(string);
1232
1233 switch (token) {
fdb66ff4 1234 case Opt_xprt_udp:
bf0fd768 1235 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1236 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1237 break;
fdb66ff4 1238 case Opt_xprt_tcp:
bf0fd768 1239 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1240 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1241 break;
2cf7ff7a
TT		 1242 case Opt_xprt_rdma:
1243 /* vector side protocols to TCP */
1244 mnt->flags |= NFS_MOUNT_TCP;
1245 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1246 xprt_load_transport(string);
2cf7ff7a 1247 break;
bf0fd768 1248 default:
f45663ce
CL		 1249 errors++;
1250 dfprintk(MOUNT, "NFS: unrecognized "
1251 "transport protocol\n");
bf0fd768 1252 }
a67d18f8 1253 kfree(string);
bf0fd768
CL		 1254 break;
1255 case Opt_mountproto:
1256 string = match_strdup(args);
1257 if (string == NULL)
1258 goto out_nomem;
1259 token = match_token(string,
1260 nfs_xprt_protocol_tokens, args);
bf0fd768
CL		 1261
1262 switch (token) {
fdb66ff4 1263 case Opt_xprt_udp:
0896a725 1264 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1265 break;
fdb66ff4 1266 case Opt_xprt_tcp:
0896a725 1267 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1268 break;
2cf7ff7a 1269 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1270 default:
f45663ce
CL		 1271 errors++;
1272 dfprintk(MOUNT, "NFS: unrecognized "
1273 "transport protocol\n");
bf0fd768
CL		 1274 }
1275 break;
1276 case Opt_addr:
1277 string = match_strdup(args);
1278 if (string == NULL)
1279 goto out_nomem;
ce3b7e19
CL		 1280 nfs_parse_ip_address(string, strlen(string),
1281 (struct sockaddr *)
1282 &mnt->nfs_server.address,
1283 &mnt->nfs_server.addrlen);
bf0fd768
CL		 1284 kfree(string);
1285 break;
1286 case Opt_clientaddr:
1287 string = match_strdup(args);
1288 if (string == NULL)
1289 goto out_nomem;
fc601477 1290 kfree(mnt->client_address);
bf0fd768
CL		 1291 mnt->client_address = string;
1292 break;
33832034
CL		 1293 case Opt_mounthost:
1294 string = match_strdup(args);
1295 if (string == NULL)
1296 goto out_nomem;
fc601477 1297 kfree(mnt->mount_server.hostname);
33832034
CL		 1298 mnt->mount_server.hostname = string;
1299 break;
0ac83779 1300 case Opt_mountaddr:
bf0fd768
CL		 1301 string = match_strdup(args);
1302 if (string == NULL)
1303 goto out_nomem;
ce3b7e19
CL		 1304 nfs_parse_ip_address(string, strlen(string),
1305 (struct sockaddr *)
1306 &mnt->mount_server.address,
1307 &mnt->mount_server.addrlen);
bf0fd768
CL		 1308 kfree(string);
1309 break;
7973c1f1
TM		 1310 case Opt_lookupcache:
1311 string = match_strdup(args);
1312 if (string == NULL)
1313 goto out_nomem;
1314 token = match_token(string,
1315 nfs_lookupcache_tokens, args);
1316 kfree(string);
1317 switch (token) {
1318 case Opt_lookupcache_all:
1319 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1320 break;
1321 case Opt_lookupcache_positive:
1322 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1323 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1324 break;
1325 case Opt_lookupcache_none:
1326 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1327 break;
1328 default:
1329 errors++;
1330 dfprintk(MOUNT, "NFS: invalid "
1331 "lookupcache argument\n");
1332 };
1333 break;
bf0fd768 1334
f45663ce
CL		 1335 /*
1336 * Special options
1337 */
1338 case Opt_sloppy:
1339 sloppy = 1;
1340 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1341 break;
bf0fd768
CL		 1342 case Opt_userspace:
1343 case Opt_deprecated:
d33e4dfe
CL		 1344 dfprintk(MOUNT, "NFS: ignoring mount option "
1345 "'%s'\n", p);
bf0fd768
CL		 1346 break;
1347
1348 default:
f45663ce
CL		 1349 errors++;
1350 dfprintk(MOUNT, "NFS: unrecognized mount option "
1351 "'%s'\n", p);
bf0fd768
CL		 1352 }
1353 }
1354
af904dea
CL		 1355 if (errors > 0) {
1356 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1357 errors, (errors == 1 ? "" : "s"));
1358 if (!sloppy)
1359 return 0;
1360 }
bf0fd768
CL		 1361 return 1;
1362
1363out_nomem:
1364 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1365 return 0;
f9c3a380
EP		 1366out_security_failure:
1367 free_secdata(secdata);
1368 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1369 return 0;
bf0fd768
CL		 1370}
1371
0076d7b7
CL		 1372/*
1373 * Use the remote server's MOUNT service to request the NFS file handle
1374 * corresponding to the provided path.
1375 */
1376static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1377 struct nfs_fh *root_fh)
1378{
c5d120f8
CL		 1379 struct nfs_mount_request request = {
1380 .sap = (struct sockaddr *)
1381 &args->mount_server.address,
1382 .dirpath = args->nfs_server.export_path,
1383 .protocol = args->mount_server.protocol,
1384 .fh = root_fh,
50a737f8 1385 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
c5d120f8 1386 };
4c568017 1387 int status;
0076d7b7
CL		 1388
1389 if (args->mount_server.version == 0) {
1390 if (args->flags & NFS_MOUNT_VER3)
1391 args->mount_server.version = NFS_MNT3_VERSION;
1392 else
1393 args->mount_server.version = NFS_MNT_VERSION;
1394 }
c5d120f8 1395 request.version = args->mount_server.version;
0076d7b7 1396
33832034 1397 if (args->mount_server.hostname)
c5d120f8 1398 request.hostname = args->mount_server.hostname;
33832034 1399 else
c5d120f8 1400 request.hostname = args->nfs_server.hostname;
33832034 1401
0076d7b7
CL		 1402 /*
1403 * Construct the mount server's address.
1404 */
4c568017 1405 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1406 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1407 args->nfs_server.addrlen);
1408 args->mount_server.addrlen = args->nfs_server.addrlen;
1409 }
c5d120f8 1410 request.salen = args->mount_server.addrlen;
4c568017 1411
aad70007
JL		 1412 /*
1413 * autobind will be used if mount_server.port == 0
1414 */
c5d120f8 1415 nfs_set_port(request.sap, args->mount_server.port);
0076d7b7
CL		 1416
1417 /*
1418 * Now ask the mount server to map our export path
1419 * to a file handle.
1420 */
c5d120f8 1421 status = nfs_mount(&request);
efd8340b
CL		 1422 if (status == 0)
1423 return 0;
0076d7b7 1424
396cee97 1425 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
c5d120f8 1426 request.hostname, status);
0076d7b7
CL		 1427 return status;
1428}
1429
d1aa0825
CL		 1430static int nfs_parse_simple_hostname(const char *dev_name,
1431 char **hostname, size_t maxnamlen,
1432 char **export_path, size_t maxpathlen)
dc045898
CL		 1433{
1434 size_t len;
1435 char *colon, *comma;
1436
1437 colon = strchr(dev_name, ':');
1438 if (colon == NULL)
1439 goto out_bad_devname;
1440
1441 len = colon - dev_name;
1442 if (len > maxnamlen)
1443 goto out_hostname;
1444
1445 /* N.B. caller will free nfs_server.hostname in all cases */
1446 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1447 if (!*hostname)
1448 goto out_nomem;
1449
1450 /* kill possible hostname list: not supported */
1451 comma = strchr(*hostname, ',');
1452 if (comma != NULL) {
1453 if (comma == *hostname)
1454 goto out_bad_devname;
1455 *comma = '\0';
1456 }
1457
1458 colon++;
1459 len = strlen(colon);
1460 if (len > maxpathlen)
1461 goto out_path;
1462 *export_path = kstrndup(colon, len, GFP_KERNEL);
1463 if (!*export_path)
1464 goto out_nomem;
1465
1466 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1467 return 0;
1468
1469out_bad_devname:
1470 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1471 return -EINVAL;
1472
1473out_nomem:
1474 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1475 return -ENOMEM;
1476
1477out_hostname:
1478 dfprintk(MOUNT, "NFS: server hostname too long\n");
1479 return -ENAMETOOLONG;
1480
1481out_path:
1482 dfprintk(MOUNT, "NFS: export pathname too long\n");
1483 return -ENAMETOOLONG;
1484}
1485
d1aa0825
CL		 1486/*
1487 * Hostname has square brackets around it because it contains one or
1488 * more colons. We look for the first closing square bracket, and a
1489 * colon must follow it.
1490 */
1491static int nfs_parse_protected_hostname(const char *dev_name,
1492 char **hostname, size_t maxnamlen,
1493 char **export_path, size_t maxpathlen)
1494{
1495 size_t len;
1496 char *start, *end;
1497
1498 start = (char *)(dev_name + 1);
1499
1500 end = strchr(start, ']');
1501 if (end == NULL)
1502 goto out_bad_devname;
1503 if (*(end + 1) != ':')
1504 goto out_bad_devname;
1505
1506 len = end - start;
1507 if (len > maxnamlen)
1508 goto out_hostname;
1509
1510 /* N.B. caller will free nfs_server.hostname in all cases */
1511 *hostname = kstrndup(start, len, GFP_KERNEL);
1512 if (*hostname == NULL)
1513 goto out_nomem;
1514
1515 end += 2;
1516 len = strlen(end);
1517 if (len > maxpathlen)
1518 goto out_path;
1519 *export_path = kstrndup(end, len, GFP_KERNEL);
1520 if (!*export_path)
1521 goto out_nomem;
1522
1523 return 0;
1524
1525out_bad_devname:
1526 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1527 return -EINVAL;
1528
1529out_nomem:
1530 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1531 return -ENOMEM;
1532
1533out_hostname:
1534 dfprintk(MOUNT, "NFS: server hostname too long\n");
1535 return -ENAMETOOLONG;
1536
1537out_path:
1538 dfprintk(MOUNT, "NFS: export pathname too long\n");
1539 return -ENAMETOOLONG;
1540}
1541
1542/*
1543 * Split "dev_name" into "hostname:export_path".
1544 *
1545 * The leftmost colon demarks the split between the server's hostname
1546 * and the export path. If the hostname starts with a left square
1547 * bracket, then it may contain colons.
1548 *
1549 * Note: caller frees hostname and export path, even on error.
1550 */
1551static int nfs_parse_devname(const char *dev_name,
1552 char **hostname, size_t maxnamlen,
1553 char **export_path, size_t maxpathlen)
1554{
1555 if (*dev_name == '[')
1556 return nfs_parse_protected_hostname(dev_name,
1557 hostname, maxnamlen,
1558 export_path, maxpathlen);
1559
1560 return nfs_parse_simple_hostname(dev_name,
1561 hostname, maxnamlen,
1562 export_path, maxpathlen);
1563}
1564
f7b422b1 1565/*
54ceac45
DH		 1566 * Validate the NFS2/NFS3 mount data
1567 * - fills in the mount root filehandle
136d558c
CL		 1568 *
1569 * For option strings, user space handles the following behaviors:
1570 *
1571 * + DNS: mapping server host name to IP address ("addr=" option)
1572 *
1573 * + failure mode: how to behave if a mount request can't be handled
1574 * immediately ("fg/bg" option)
1575 *
1576 * + retry: how often to retry a mount request ("retry=" option)
1577 *
1578 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1579 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1580 */
2283f8d6
TT		 1581static int nfs_validate_mount_data(void *options,
1582 struct nfs_parsed_mount_data *args,
136d558c
CL		 1583 struct nfs_fh *mntfh,
1584 const char *dev_name)
f7b422b1 1585{
2283f8d6 1586 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
136d558c 1587
5df36e78
CL		 1588 if (data == NULL)
1589 goto out_no_data;
f7b422b1 1590
2283f8d6
TT		 1591 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1592 args->rsize = NFS_MAX_FILE_IO_SIZE;
1593 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1594 args->acregmin = NFS_DEF_ACREGMIN;
1595 args->acregmax = NFS_DEF_ACREGMAX;
1596 args->acdirmin = NFS_DEF_ACDIRMIN;
1597 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 1598 args->mount_server.port = 0; /* autobind unless user sets port */
f22d6d79 1599 args->nfs_server.port = 0; /* autobind unless user sets port */
0896a725 1600 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1601 args->auth_flavors[0] = RPC_AUTH_UNIX;
2283f8d6 1602
54ceac45 1603 switch (data->version) {
5df36e78
CL		 1604 case 1:
1605 data->namlen = 0;
1606 case 2:
1607 data->bsize = 0;
1608 case 3:
1609 if (data->flags & NFS_MOUNT_VER3)
1610 goto out_no_v3;
1611 data->root.size = NFS2_FHSIZE;
1612 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1613 case 4:
1614 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1615 goto out_no_sec;
1616 case 5:
1617 memset(data->context, 0, sizeof(data->context));
1618 case 6:
b7e24457
TM		 1619 if (data->flags & NFS_MOUNT_VER3) {
1620 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1621 goto out_invalid_fh;
5df36e78 1622 mntfh->size = data->root.size;
b7e24457 1623 } else
5df36e78
CL		 1624 mntfh->size = NFS2_FHSIZE;
1625
5df36e78
CL		 1626
1627 memcpy(mntfh->data, data->root.data, mntfh->size);
1628 if (mntfh->size < sizeof(mntfh->data))
1629 memset(mntfh->data + mntfh->size, 0,
1630 sizeof(mntfh->data) - mntfh->size);
6e88e061 1631
2283f8d6
TT		 1632 /*
1633 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1634 * can deal with.
1635 */
ff3525a5 1636 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1637 args->rsize = data->rsize;
1638 args->wsize = data->wsize;
2283f8d6
TT		 1639 args->timeo = data->timeo;
1640 args->retrans = data->retrans;
1641 args->acregmin = data->acregmin;
1642 args->acregmax = data->acregmax;
1643 args->acdirmin = data->acdirmin;
1644 args->acdirmax = data->acdirmax;
4c568017
CL		 1645
1646 memcpy(&args->nfs_server.address, &data->addr,
1647 sizeof(data->addr));
1648 args->nfs_server.addrlen = sizeof(data->addr);
1649 if (!nfs_verify_server_address((struct sockaddr *)
1650 &args->nfs_server.address))
1651 goto out_no_address;
1652
2283f8d6 1653 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1654 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1655 /* N.B. caller will free nfs_server.hostname in all cases */
1656 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1657 args->namlen = data->namlen;
1658 args->bsize = data->bsize;
dd07c947
CL		 1659
1660 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1661 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1662 if (!args->nfs_server.hostname)
1663 goto out_nomem;
f9c3a380
EP		 1664
1665 /*
1666 * The legacy version 6 binary mount data from userspace has a
1667 * field used only to transport selinux information into the
1668 * the kernel. To continue to support that functionality we
1669 * have a touch of selinux knowledge here in the NFS code. The
1670 * userspace code converted context=blah to just blah so we are
1671 * converting back to the full string selinux understands.
1672 */
1673 if (data->context[0]){
1674#ifdef CONFIG_SECURITY_SELINUX
1675 int rc;
1676 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1677 if (!opts_str)
1678 return -ENOMEM;
1679 strcpy(opts_str, "context=");
1680 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1681 strcat(opts_str, &data->context[0]);
1682 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1683 kfree(opts_str);
1684 if (rc)
1685 return rc;
1686#else
1687 return -EINVAL;
1688#endif
1689 }
1690
5df36e78 1691 break;
136d558c 1692 default: {
136d558c 1693 int status;
136d558c 1694
2283f8d6
TT		 1695 if (nfs_parse_mount_options((char *)options, args) == 0)
1696 return -EINVAL;
136d558c 1697
6e88e061
CL		 1698 if (!nfs_verify_server_address((struct sockaddr *)
1699 &args->nfs_server.address))
1700 goto out_no_address;
1701
ed596a8a
CL		 1702 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1703 args->nfs_server.port);
1704
259875ef
TM		 1705 nfs_set_mount_transport_protocol(args);
1706
dc045898
CL		 1707 status = nfs_parse_devname(dev_name,
1708 &args->nfs_server.hostname,
1709 PAGE_SIZE,
1710 &args->nfs_server.export_path,
1711 NFS_MAXPATHLEN);
1712 if (!status)
1713 status = nfs_try_mount(args, mntfh);
136d558c 1714
dc045898
CL		 1715 kfree(args->nfs_server.export_path);
1716 args->nfs_server.export_path = NULL;
136d558c 1717
136d558c 1718 if (status)
fdc6e2c8 1719 return status;
136d558c 1720
136d558c
CL		 1721 break;
1722 }
f7b422b1 1723 }
54ceac45
DH		 1724
1725#ifndef CONFIG_NFS_V3
2283f8d6 1726 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1727 goto out_v3_not_compiled;
1728#endif /* !CONFIG_NFS_V3 */
f7b422b1 1729
5df36e78 1730 return 0;
f7b422b1 1731
5df36e78
CL		 1732out_no_data:
1733 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1734 return -EINVAL;
54ceac45 1735
5df36e78
CL		 1736out_no_v3:
1737 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1738 data->version);
1739 return -EINVAL;
f7b422b1 1740
5df36e78
CL		 1741out_no_sec:
1742 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1743 return -EINVAL;
1744
5df36e78
CL		 1745#ifndef CONFIG_NFS_V3
1746out_v3_not_compiled:
1747 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1748 return -EPROTONOSUPPORT;
1749#endif /* !CONFIG_NFS_V3 */
1750
63649bd7
CG		 1751out_nomem:
1752 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1753 return -ENOMEM;
1754
5df36e78
CL		 1755out_no_address:
1756 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1757 return -EINVAL;
1758
1759out_invalid_fh:
1760 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1761 return -EINVAL;
f7b422b1
DH		 1762}
1763
48b605f8
JL		 1764static int
1765nfs_compare_remount_data(struct nfs_server *nfss,
1766 struct nfs_parsed_mount_data *data)
1767{
1768 if (data->flags != nfss->flags ||
1769 data->rsize != nfss->rsize ||
1770 data->wsize != nfss->wsize ||
1771 data->retrans != nfss->client->cl_timeout->to_retries ||
1772 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1773 data->acregmin != nfss->acregmin / HZ ||
1774 data->acregmax != nfss->acregmax / HZ ||
1775 data->acdirmin != nfss->acdirmin / HZ ||
1776 data->acdirmax != nfss->acdirmax / HZ ||
1777 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1778 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1779 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1780 data->nfs_server.addrlen) != 0)
1781 return -EINVAL;
1782
1783 return 0;
1784}
1785
1786static int
1787nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1788{
1789 int error;
1790 struct nfs_server *nfss = sb->s_fs_info;
1791 struct nfs_parsed_mount_data *data;
1792 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1793 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1794 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1795
1796 /*
1797 * Userspace mount programs that send binary options generally send
1798 * them populated with default values. We have no way to know which
1799 * ones were explicitly specified. Fall back to legacy behavior and
1800 * just return success.
1801 */
31c94469
MZ		 1802 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1803 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1804 options->version <= 6))))
48b605f8
JL		 1805 return 0;
1806
1807 data = kzalloc(sizeof(*data), GFP_KERNEL);
1808 if (data == NULL)
1809 return -ENOMEM;
1810
1811 /* fill out struct with values from existing mount */
1812 data->flags = nfss->flags;
1813 data->rsize = nfss->rsize;
1814 data->wsize = nfss->wsize;
1815 data->retrans = nfss->client->cl_timeout->to_retries;
1816 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1817 data->acregmin = nfss->acregmin / HZ;
1818 data->acregmax = nfss->acregmax / HZ;
1819 data->acdirmin = nfss->acdirmin / HZ;
1820 data->acdirmax = nfss->acdirmax / HZ;
1821 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1822 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1823 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1824 data->nfs_server.addrlen);
1825
1826 /* overwrite those values with any that were specified */
1827 error = nfs_parse_mount_options((char *)options, data);
1828 if (error < 0)
1829 goto out;
1830
1831 /* compare new mount options with old ones */
1832 error = nfs_compare_remount_data(nfss, data);
1833out:
1834 kfree(data);
1835 return error;
1836}
1837
f7b422b1 1838/*
54ceac45 1839 * Initialise the common bits of the superblock
f7b422b1 1840 */
54ceac45 1841static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1842{
54ceac45 1843 struct nfs_server *server = NFS_SB(sb);
5006a76c 1844
54ceac45 1845 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1846
54ceac45
DH		 1847 /* We probably want something more informative here */
1848 snprintf(sb->s_id, sizeof(sb->s_id),
1849 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1850
54ceac45
DH		 1851 if (sb->s_blocksize == 0)
1852 sb->s_blocksize = nfs_block_bits(server->wsize,
1853 &sb->s_blocksize_bits);
f7b422b1 1854
54ceac45
DH		 1855 if (server->flags & NFS_MOUNT_NOAC)
1856 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1857
54ceac45 1858 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1859}
1860
1861/*
54ceac45 1862 * Finish setting up an NFS2/3 superblock
f7b422b1 1863 */
2283f8d6
TT		 1864static void nfs_fill_super(struct super_block *sb,
1865 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1866{
1867 struct nfs_server *server = NFS_SB(sb);
5006a76c 1868
54ceac45
DH		 1869 sb->s_blocksize_bits = 0;
1870 sb->s_blocksize = 0;
1871 if (data->bsize)
1872 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1873
54ceac45
DH		 1874 if (server->flags & NFS_MOUNT_VER3) {
1875 /* The VFS shouldn't apply the umask to mode bits. We will do
1876 * so ourselves when necessary.
1877 */
1878 sb->s_flags |= MS_POSIXACL;
1879 sb->s_time_gran = 1;
816724e6 1880 }
54ceac45
DH		 1881
1882 sb->s_op = &nfs_sops;
1883 nfs_initialise_sb(sb);
f7b422b1
DH		 1884}
1885
1886/*
54ceac45 1887 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1888 */
54ceac45
DH		 1889static void nfs_clone_super(struct super_block *sb,
1890 const struct super_block *old_sb)
f7b422b1 1891{
54ceac45
DH		 1892 struct nfs_server *server = NFS_SB(sb);
1893
1894 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1895 sb->s_blocksize = old_sb->s_blocksize;
1896 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1897
f7b422b1 1898 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1899 /* The VFS shouldn't apply the umask to mode bits. We will do
1900 * so ourselves when necessary.
f7b422b1
DH		 1901 */
1902 sb->s_flags |= MS_POSIXACL;
f7b422b1 1903 sb->s_time_gran = 1;
f7b422b1
DH		 1904 }
1905
54ceac45
DH		 1906 sb->s_op = old_sb->s_op;
1907 nfs_initialise_sb(sb);
f7b422b1
DH		 1908}
1909
275a5d24
TM		 1910static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1911{
1912 const struct nfs_server *a = s->s_fs_info;
1913 const struct rpc_clnt *clnt_a = a->client;
1914 const struct rpc_clnt *clnt_b = b->client;
1915
1916 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1917 goto Ebusy;
1918 if (a->nfs_client != b->nfs_client)
1919 goto Ebusy;
1920 if (a->flags != b->flags)
1921 goto Ebusy;
1922 if (a->wsize != b->wsize)
1923 goto Ebusy;
1924 if (a->rsize != b->rsize)
1925 goto Ebusy;
1926 if (a->acregmin != b->acregmin)
1927 goto Ebusy;
1928 if (a->acregmax != b->acregmax)
1929 goto Ebusy;
1930 if (a->acdirmin != b->acdirmin)
1931 goto Ebusy;
1932 if (a->acdirmax != b->acdirmax)
1933 goto Ebusy;
1934 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1935 goto Ebusy;
e89a5a43 1936 return 1;
275a5d24 1937Ebusy:
e89a5a43
TM		 1938 return 0;
1939}
1940
1941struct nfs_sb_mountdata {
1942 struct nfs_server *server;
1943 int mntflags;
1944};
1945
1946static int nfs_set_super(struct super_block *s, void *data)
1947{
1948 struct nfs_sb_mountdata *sb_mntdata = data;
1949 struct nfs_server *server = sb_mntdata->server;
1950 int ret;
1951
1952 s->s_flags = sb_mntdata->mntflags;
1953 s->s_fs_info = server;
1954 ret = set_anon_super(s, server);
1955 if (ret == 0)
1956 server->s_dev = s->s_dev;
1957 return ret;
1958}
1959
fd00a8ff
CL		 1960static int nfs_compare_super_address(struct nfs_server *server1,
1961 struct nfs_server *server2)
1962{
1963 struct sockaddr *sap1, *sap2;
1964
1965 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1966 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1967
1968 if (sap1->sa_family != sap2->sa_family)
1969 return 0;
1970
1971 switch (sap1->sa_family) {
1972 case AF_INET: {
1973 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1974 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1975 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1976 return 0;
1977 if (sin1->sin_port != sin2->sin_port)
1978 return 0;
1979 break;
1980 }
1981 case AF_INET6: {
1982 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1983 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1984 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1985 return 0;
1986 if (sin1->sin6_port != sin2->sin6_port)
1987 return 0;
1988 break;
1989 }
1990 default:
1991 return 0;
1992 }
1993
1994 return 1;
1995}
1996
e89a5a43
TM		 1997static int nfs_compare_super(struct super_block *sb, void *data)
1998{
1999 struct nfs_sb_mountdata *sb_mntdata = data;
2000 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2001 int mntflags = sb_mntdata->mntflags;
2002
fd00a8ff 2003 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2004 return 0;
2005 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2006 if (old->flags & NFS_MOUNT_UNSHARED)
2007 return 0;
2008 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2009 return 0;
2010 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2011}
2012
fa799759
MS		 2013static int nfs_bdi_register(struct nfs_server *server)
2014{
2015 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2016}
2017
816724e6
TM		 2018static int nfs_get_sb(struct file_system_type *fs_type,
2019 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2020{
f7b422b1
DH		 2021 struct nfs_server *server = NULL;
2022 struct super_block *s;
33852a1f
TM		 2023 struct nfs_parsed_mount_data *data;
2024 struct nfs_fh *mntfh;
54ceac45 2025 struct dentry *mntroot;
75180df2 2026 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2027 struct nfs_sb_mountdata sb_mntdata = {
2028 .mntflags = flags,
2029 };
33852a1f
TM		 2030 int error = -ENOMEM;
2031
2032 data = kzalloc(sizeof(*data), GFP_KERNEL);
2033 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2034 if (data == NULL || mntfh == NULL)
2035 goto out_free_fh;
f7b422b1 2036
33852a1f 2037 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2038
54ceac45 2039 /* Validate the mount data */
33852a1f 2040 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2041 if (error < 0)
0655960f 2042 goto out;
f7b422b1 2043
54ceac45 2044 /* Get a volume representation */
33852a1f 2045 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2046 if (IS_ERR(server)) {
2047 error = PTR_ERR(server);
0655960f 2048 goto out;
f7b422b1 2049 }
e89a5a43 2050 sb_mntdata.server = server;
f7b422b1 2051
75180df2
TM		 2052 if (server->flags & NFS_MOUNT_UNSHARED)
2053 compare_super = NULL;
2054
54ceac45 2055 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2056 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2057 if (IS_ERR(s)) {
2058 error = PTR_ERR(s);
54ceac45 2059 goto out_err_nosb;
816724e6
TM		 2060 }
2061
54ceac45
DH		 2062 if (s->s_fs_info != server) {
2063 nfs_free_server(server);
2064 server = NULL;
fa799759
MS		 2065 } else {
2066 error = nfs_bdi_register(server);
2067 if (error)
2068 goto error_splat_super;
54ceac45 2069 }
f7b422b1 2070
54ceac45
DH		 2071 if (!s->s_root) {
2072 /* initial superblock/root creation */
33852a1f 2073 nfs_fill_super(s, data);
08734048 2074 nfs_fscache_get_super_cookie(s, data);
54ceac45 2075 }
f7b422b1 2076
33852a1f 2077 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2078 if (IS_ERR(mntroot)) {
2079 error = PTR_ERR(mntroot);
2080 goto error_splat_super;
f7b422b1 2081 }
816724e6 2082
33852a1f 2083 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2084 if (error)
2085 goto error_splat_root;
2086
54ceac45
DH		 2087 s->s_flags |= MS_ACTIVE;
2088 mnt->mnt_sb = s;
2089 mnt->mnt_root = mntroot;
0655960f
CL		 2090 error = 0;
2091
2092out:
33852a1f
TM		 2093 kfree(data->nfs_server.hostname);
2094 kfree(data->mount_server.hostname);
08734048 2095 kfree(data->fscache_uniq);
33852a1f
TM		 2096 security_free_mnt_opts(&data->lsm_opts);
2097out_free_fh:
2098 kfree(mntfh);
2099 kfree(data);
0655960f 2100 return error;
816724e6 2101
54ceac45
DH		 2102out_err_nosb:
2103 nfs_free_server(server);
0655960f 2104 goto out;
54ceac45 2105
f9c3a380
EP		 2106error_splat_root:
2107 dput(mntroot);
54ceac45
DH		 2108error_splat_super:
2109 up_write(&s->s_umount);
2110 deactivate_super(s);
0655960f 2111 goto out;
f7b422b1
DH		 2112}
2113
54ceac45
DH		 2114/*
2115 * Destroy an NFS2/3 superblock
2116 */
f7b422b1
DH		 2117static void nfs_kill_super(struct super_block *s)
2118{
2119 struct nfs_server *server = NFS_SB(s);
2120
fa799759 2121 bdi_unregister(&server->backing_dev_info);
f7b422b1 2122 kill_anon_super(s);
08734048 2123 nfs_fscache_release_super_cookie(s);
54ceac45 2124 nfs_free_server(server);
f7b422b1
DH		 2125}
2126
54ceac45
DH		 2127/*
2128 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2129 */
2130static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2131 const char *dev_name, void *raw_data,
2132 struct vfsmount *mnt)
f7b422b1
DH		 2133{
2134 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2135 struct super_block *s;
2136 struct nfs_server *server;
2137 struct dentry *mntroot;
75180df2 2138 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2139 struct nfs_sb_mountdata sb_mntdata = {
2140 .mntflags = flags,
2141 };
54ceac45 2142 int error;
f7b422b1 2143
54ceac45 2144 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2145
54ceac45
DH		 2146 /* create a new volume representation */
2147 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2148 if (IS_ERR(server)) {
2149 error = PTR_ERR(server);
2150 goto out_err_noserver;
2151 }
e89a5a43 2152 sb_mntdata.server = server;
8fa5c000 2153
75180df2
TM		 2154 if (server->flags & NFS_MOUNT_UNSHARED)
2155 compare_super = NULL;
2156
54ceac45 2157 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2158 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2159 if (IS_ERR(s)) {
2160 error = PTR_ERR(s);
2161 goto out_err_nosb;
2162 }
5006a76c 2163
54ceac45
DH		 2164 if (s->s_fs_info != server) {
2165 nfs_free_server(server);
2166 server = NULL;
fa799759
MS		 2167 } else {
2168 error = nfs_bdi_register(server);
2169 if (error)
2170 goto error_splat_super;
f7b422b1 2171 }
24c8dbbb 2172
54ceac45
DH		 2173 if (!s->s_root) {
2174 /* initial superblock/root creation */
54ceac45
DH		 2175 nfs_clone_super(s, data->sb);
2176 }
f7b422b1 2177
54ceac45
DH		 2178 mntroot = nfs_get_root(s, data->fh);
2179 if (IS_ERR(mntroot)) {
2180 error = PTR_ERR(mntroot);
2181 goto error_splat_super;
f7b422b1 2182 }
e9cc6c23 2183 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2184 dput(mntroot);
2185 error = -ESTALE;
2186 goto error_splat_super;
2187 }
f7b422b1 2188
54ceac45
DH		 2189 s->s_flags |= MS_ACTIVE;
2190 mnt->mnt_sb = s;
2191 mnt->mnt_root = mntroot;
f7b422b1 2192
f9c3a380
EP		 2193 /* clone any lsm security options from the parent to the new sb */
2194 security_sb_clone_mnt_opts(data->sb, s);
2195
54ceac45
DH		 2196 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2197 return 0;
24c8dbbb 2198
54ceac45
DH		 2199out_err_nosb:
2200 nfs_free_server(server);
2201out_err_noserver:
2202 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2203 return error;
f7b422b1 2204
54ceac45
DH		 2205error_splat_super:
2206 up_write(&s->s_umount);
2207 deactivate_super(s);
2208 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2209 return error;
f7b422b1
DH		 2210}
2211
54ceac45
DH		 2212#ifdef CONFIG_NFS_V4
2213
f7b422b1 2214/*
54ceac45 2215 * Finish setting up a cloned NFS4 superblock
f7b422b1 2216 */
54ceac45
DH		 2217static void nfs4_clone_super(struct super_block *sb,
2218 const struct super_block *old_sb)
f7b422b1 2219{
54ceac45
DH		 2220 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2221 sb->s_blocksize = old_sb->s_blocksize;
2222 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2223 sb->s_time_gran = 1;
54ceac45
DH		 2224 sb->s_op = old_sb->s_op;
2225 nfs_initialise_sb(sb);
f7b422b1
DH		 2226}
2227
54ceac45
DH		 2228/*
2229 * Set up an NFS4 superblock
2230 */
2231static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2232{
54ceac45
DH		 2233 sb->s_time_gran = 1;
2234 sb->s_op = &nfs4_sops;
2235 nfs_initialise_sb(sb);
f7b422b1
DH		 2236}
2237
f0768ebd
CL		 2238/*
2239 * Validate NFSv4 mount options
2240 */
91ea40b9
TT		 2241static int nfs4_validate_mount_data(void *options,
2242 struct nfs_parsed_mount_data *args,
2243 const char *dev_name)
f0768ebd 2244{
4c568017 2245 struct sockaddr_in *ap;
91ea40b9 2246 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2247 char *c;
2248
2249 if (data == NULL)
2250 goto out_no_data;
2251
91ea40b9
TT		 2252 args->rsize = NFS_MAX_FILE_IO_SIZE;
2253 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2254 args->acregmin = NFS_DEF_ACREGMIN;
2255 args->acregmax = NFS_DEF_ACREGMAX;
2256 args->acdirmin = NFS_DEF_ACDIRMIN;
2257 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 2258 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
6738b251
CL		 2259 args->auth_flavors[0] = RPC_AUTH_UNIX;
2260 args->auth_flavor_len = 0;
91ea40b9 2261
f0768ebd
CL		 2262 switch (data->version) {
2263 case 1:
4c568017
CL		 2264 ap = (struct sockaddr_in *)&args->nfs_server.address;
2265 if (data->host_addrlen > sizeof(args->nfs_server.address))
2266 goto out_no_address;
2267 if (data->host_addrlen == 0)
f0768ebd 2268 goto out_no_address;
4c568017
CL		 2269 args->nfs_server.addrlen = data->host_addrlen;
2270 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
f0768ebd 2271 return -EFAULT;
91ea40b9
TT		 2272 if (!nfs_verify_server_address((struct sockaddr *)
2273 &args->nfs_server.address))
f0768ebd
CL		 2274 goto out_no_address;
2275
6738b251
CL		 2276 if (data->auth_flavourlen) {
2277 if (data->auth_flavourlen > 1)
2278 goto out_inval_auth;
20c71f5e 2279 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2280 data->auth_flavours,
20c71f5e 2281 sizeof(args->auth_flavors[0])))
f0768ebd 2282 return -EFAULT;
f0768ebd
CL		 2283 }
2284
2285 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2286 if (IS_ERR(c))
2287 return PTR_ERR(c);
91ea40b9 2288 args->nfs_server.hostname = c;
f0768ebd
CL		 2289
2290 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2291 if (IS_ERR(c))
2292 return PTR_ERR(c);
91ea40b9
TT		 2293 args->nfs_server.export_path = c;
2294 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2295
2296 c = strndup_user(data->client_addr.data, 16);
2297 if (IS_ERR(c))
2298 return PTR_ERR(c);
91ea40b9
TT		 2299 args->client_address = c;
2300
2301 /*
2302 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2303 * can deal with.
2304 */
2305
2306 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2307 args->rsize = data->rsize;
2308 args->wsize = data->wsize;
2309 args->timeo = data->timeo;
2310 args->retrans = data->retrans;
2311 args->acregmin = data->acregmin;
2312 args->acregmax = data->acregmax;
2313 args->acdirmin = data->acdirmin;
2314 args->acdirmax = data->acdirmax;
2315 args->nfs_server.protocol = data->proto;
259875ef 2316 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2317
2318 break;
80071225 2319 default: {
dc045898 2320 int status;
91ea40b9
TT		 2321
2322 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2323 return -EINVAL;
2324
2325 if (!nfs_verify_server_address((struct sockaddr *)
91ea40b9 2326 &args->nfs_server.address))
80071225 2327 return -EINVAL;
80071225 2328
ed596a8a
CL		 2329 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2330 args->nfs_server.port);
2331
259875ef
TM		 2332 nfs_validate_transport_protocol(args);
2333
6738b251 2334 if (args->auth_flavor_len > 1)
80071225 2335 goto out_inval_auth;
80071225 2336
91ea40b9 2337 if (args->client_address == NULL)
0a87cf12
JL		 2338 goto out_no_client_address;
2339
dc045898
CL		 2340 status = nfs_parse_devname(dev_name,
2341 &args->nfs_server.hostname,
2342 NFS4_MAXNAMLEN,
2343 &args->nfs_server.export_path,
2344 NFS4_MAXPATHLEN);
2345 if (status < 0)
2346 return status;
2347
80071225
CL		 2348 break;
2349 }
f0768ebd
CL		 2350 }
2351
2352 return 0;
2353
2354out_no_data:
2355 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2356 return -EINVAL;
2357
2358out_inval_auth:
2359 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2360 data->auth_flavourlen);
2361 return -EINVAL;
2362
2363out_no_address:
2364 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2365 return -EINVAL;
0a87cf12
JL		 2366
2367out_no_client_address:
2368 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2369 return -EINVAL;
f0768ebd
CL		 2370}
2371
54ceac45
DH		 2372/*
2373 * Get the superblock for an NFS4 mountpoint
2374 */
816724e6
TM		 2375static int nfs4_get_sb(struct file_system_type *fs_type,
2376 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2377{
33852a1f 2378 struct nfs_parsed_mount_data *data;
54ceac45
DH		 2379 struct super_block *s;
2380 struct nfs_server *server;
33852a1f 2381 struct nfs_fh *mntfh;
54ceac45 2382 struct dentry *mntroot;
75180df2 2383 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2384 struct nfs_sb_mountdata sb_mntdata = {
2385 .mntflags = flags,
2386 };
33852a1f
TM		 2387 int error = -ENOMEM;
2388
2389 data = kzalloc(sizeof(*data), GFP_KERNEL);
2390 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2391 if (data == NULL || mntfh == NULL)
2392 goto out_free_fh;
f7b422b1 2393
33852a1f 2394 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2395
f0768ebd 2396 /* Validate the mount data */
33852a1f 2397 error = nfs4_validate_mount_data(raw_data, data, dev_name);
f0768ebd
CL		 2398 if (error < 0)
2399 goto out;
f7b422b1 2400
54ceac45 2401 /* Get a volume representation */
33852a1f 2402 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2403 if (IS_ERR(server)) {
2404 error = PTR_ERR(server);
29eb981a 2405 goto out;
f7b422b1 2406 }
e89a5a43 2407 sb_mntdata.server = server;
f7b422b1 2408
75180df2
TM		 2409 if (server->flags & NFS4_MOUNT_UNSHARED)
2410 compare_super = NULL;
2411
54ceac45 2412 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2413 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2414 if (IS_ERR(s)) {
2415 error = PTR_ERR(s);
f7b422b1 2416 goto out_free;
816724e6
TM		 2417 }
2418
5dd3177a
TM		 2419 if (s->s_fs_info != server) {
2420 nfs_free_server(server);
2421 server = NULL;
fa799759
MS		 2422 } else {
2423 error = nfs_bdi_register(server);
2424 if (error)
2425 goto error_splat_super;
5dd3177a
TM		 2426 }
2427
54ceac45
DH		 2428 if (!s->s_root) {
2429 /* initial superblock/root creation */
54ceac45 2430 nfs4_fill_super(s);
08734048 2431 nfs_fscache_get_super_cookie(s, data);
54ceac45 2432 }
f7b422b1 2433
33852a1f 2434 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2435 if (IS_ERR(mntroot)) {
2436 error = PTR_ERR(mntroot);
2437 goto error_splat_super;
f7b422b1 2438 }
54ceac45 2439
33852a1f 2440 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2441 if (error)
2442 goto error_splat_root;
2443
f7b422b1 2444 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2445 mnt->mnt_sb = s;
2446 mnt->mnt_root = mntroot;
29eb981a
CL		 2447 error = 0;
2448
2449out:
33852a1f
TM		 2450 kfree(data->client_address);
2451 kfree(data->nfs_server.export_path);
2452 kfree(data->nfs_server.hostname);
08734048 2453 kfree(data->fscache_uniq);
33852a1f
TM		 2454 security_free_mnt_opts(&data->lsm_opts);
2455out_free_fh:
2456 kfree(mntfh);
2457 kfree(data);
29eb981a 2458 return error;
54ceac45 2459
f7b422b1 2460out_free:
54ceac45 2461 nfs_free_server(server);
29eb981a 2462 goto out;
54ceac45 2463
46c8ac74
EP		 2464error_splat_root:
2465 dput(mntroot);
54ceac45
DH		 2466error_splat_super:
2467 up_write(&s->s_umount);
2468 deactivate_super(s);
29eb981a 2469 goto out;
f7b422b1
DH		 2470}
2471
2472static void nfs4_kill_super(struct super_block *sb)
2473{
2474 struct nfs_server *server = NFS_SB(sb);
2475
515d8611 2476 nfs_super_return_all_delegations(sb);
f7b422b1
DH		 2477 kill_anon_super(sb);
2478
2479 nfs4_renewd_prepare_shutdown(server);
08734048 2480 nfs_fscache_release_super_cookie(sb);
54ceac45 2481 nfs_free_server(server);
f7b422b1
DH		 2482}
2483
2484/*
54ceac45 2485 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2486 */
54ceac45
DH		 2487static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2488 const char *dev_name, void *raw_data,
2489 struct vfsmount *mnt)
f7b422b1 2490{
54ceac45
DH		 2491 struct nfs_clone_mount *data = raw_data;
2492 struct super_block *s;
2493 struct nfs_server *server;
2494 struct dentry *mntroot;
75180df2 2495 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2496 struct nfs_sb_mountdata sb_mntdata = {
2497 .mntflags = flags,
2498 };
54ceac45 2499 int error;
f7b422b1 2500
54ceac45 2501 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2502
54ceac45
DH		 2503 /* create a new volume representation */
2504 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2505 if (IS_ERR(server)) {
2506 error = PTR_ERR(server);
2507 goto out_err_noserver;
f7b422b1 2508 }
e89a5a43 2509 sb_mntdata.server = server;
f7b422b1 2510
75180df2
TM		 2511 if (server->flags & NFS4_MOUNT_UNSHARED)
2512 compare_super = NULL;
2513
54ceac45 2514 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2515 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2516 if (IS_ERR(s)) {
2517 error = PTR_ERR(s);
2518 goto out_err_nosb;
f7b422b1 2519 }
f7b422b1 2520
54ceac45
DH		 2521 if (s->s_fs_info != server) {
2522 nfs_free_server(server);
2523 server = NULL;
fa799759
MS		 2524 } else {
2525 error = nfs_bdi_register(server);
2526 if (error)
2527 goto error_splat_super;
54ceac45 2528 }
f7b422b1 2529
54ceac45
DH		 2530 if (!s->s_root) {
2531 /* initial superblock/root creation */
54ceac45
DH		 2532 nfs4_clone_super(s, data->sb);
2533 }
f7b422b1 2534
54ceac45
DH		 2535 mntroot = nfs4_get_root(s, data->fh);
2536 if (IS_ERR(mntroot)) {
2537 error = PTR_ERR(mntroot);
2538 goto error_splat_super;
2539 }
e9cc6c23
TM		 2540 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2541 dput(mntroot);
2542 error = -ESTALE;
2543 goto error_splat_super;
2544 }
f7b422b1 2545
54ceac45
DH		 2546 s->s_flags |= MS_ACTIVE;
2547 mnt->mnt_sb = s;
2548 mnt->mnt_root = mntroot;
2549
46c8ac74
EP		 2550 security_sb_clone_mnt_opts(data->sb, s);
2551
54ceac45
DH		 2552 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2553 return 0;
2554
2555out_err_nosb:
2556 nfs_free_server(server);
2557out_err_noserver:
2558 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2559 return error;
2560
2561error_splat_super:
2562 up_write(&s->s_umount);
2563 deactivate_super(s);
2564 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2565 return error;
f7b422b1
DH		 2566}
2567
54ceac45
DH		 2568/*
2569 * Create an NFS4 server record on referral traversal
2570 */
2571static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2572 const char *dev_name, void *raw_data,
2573 struct vfsmount *mnt)
f7b422b1
DH		 2574{
2575 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2576 struct super_block *s;
2577 struct nfs_server *server;
2578 struct dentry *mntroot;
2579 struct nfs_fh mntfh;
75180df2 2580 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2581 struct nfs_sb_mountdata sb_mntdata = {
2582 .mntflags = flags,
2583 };
54ceac45
DH		 2584 int error;
2585
2586 dprintk("--> nfs4_referral_get_sb()\n");
2587
2588 /* create a new volume representation */
2589 server = nfs4_create_referral_server(data, &mntfh);
2590 if (IS_ERR(server)) {
2591 error = PTR_ERR(server);
2592 goto out_err_noserver;
2593 }
e89a5a43 2594 sb_mntdata.server = server;
54ceac45 2595
75180df2
TM		 2596 if (server->flags & NFS4_MOUNT_UNSHARED)
2597 compare_super = NULL;
2598
54ceac45 2599 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2600 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2601 if (IS_ERR(s)) {
2602 error = PTR_ERR(s);
2603 goto out_err_nosb;
2604 }
2605
2606 if (s->s_fs_info != server) {
2607 nfs_free_server(server);
2608 server = NULL;
fa799759
MS		 2609 } else {
2610 error = nfs_bdi_register(server);
2611 if (error)
2612 goto error_splat_super;
54ceac45
DH		 2613 }
2614
2615 if (!s->s_root) {
2616 /* initial superblock/root creation */
54ceac45
DH		 2617 nfs4_fill_super(s);
2618 }
2619
f2d0d85e 2620 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2621 if (IS_ERR(mntroot)) {
2622 error = PTR_ERR(mntroot);
2623 goto error_splat_super;
2624 }
e9cc6c23
TM		 2625 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2626 dput(mntroot);
2627 error = -ESTALE;
2628 goto error_splat_super;
2629 }
54ceac45
DH		 2630
2631 s->s_flags |= MS_ACTIVE;
2632 mnt->mnt_sb = s;
2633 mnt->mnt_root = mntroot;
2634
46c8ac74
EP		 2635 security_sb_clone_mnt_opts(data->sb, s);
2636
54ceac45
DH		 2637 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2638 return 0;
2639
2640out_err_nosb:
2641 nfs_free_server(server);
2642out_err_noserver:
2643 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2644 return error;
2645
2646error_splat_super:
2647 up_write(&s->s_umount);
2648 deactivate_super(s);
2649 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2650 return error;
f7b422b1
DH		 2651}
2652
54ceac45 2653#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)