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NFS: Add ability to send MOUNTPROC_UMNT to the kernel's mountd client
[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>
c02d7adf
TM		 45#include <linux/mnt_namespace.h>
46#include <linux/namei.h>
f7b422b1
DH		 47#include <linux/nfs_idmap.h>
48#include <linux/vfs.h>
49#include <linux/inet.h>
fd00a8ff
CL		 50#include <linux/in6.h>
51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.h>
f7b422b1
DH		 56
57#include <asm/system.h>
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
f7b422b1
DH		 66
67#define NFSDBG_FACILITY NFSDBG_VFS
68
bf0fd768
CL		 69enum {
70 /* Mount options that take no arguments */
71 Opt_soft, Opt_hard,
bf0fd768
CL		 72 Opt_posix, Opt_noposix,
73 Opt_cto, Opt_nocto,
74 Opt_ac, Opt_noac,
75 Opt_lock, Opt_nolock,
76 Opt_v2, Opt_v3,
2cf7ff7a 77 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 78 Opt_acl, Opt_noacl,
79 Opt_rdirplus, Opt_nordirplus,
75180df2 80 Opt_sharecache, Opt_nosharecache,
d740351b 81 Opt_resvport, Opt_noresvport,
b797cac7 82 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 83
84 /* Mount options that take integer arguments */
85 Opt_port,
86 Opt_rsize, Opt_wsize, Opt_bsize,
87 Opt_timeo, Opt_retrans,
88 Opt_acregmin, Opt_acregmax,
89 Opt_acdirmin, Opt_acdirmax,
90 Opt_actimeo,
91 Opt_namelen,
92 Opt_mountport,
e887cbcf 93 Opt_mountvers,
ad879cef 94 Opt_nfsvers,
3fd5be9e 95 Opt_minorversion,
bf0fd768
CL		 96
97 /* Mount options that take string arguments */
33832034 98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 100 Opt_lookupcache,
b797cac7 101 Opt_fscache_uniq,
bf0fd768 102
f45663ce
CL		 103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 105
106 Opt_err
107};
108
a447c093 109static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
ecbb3845
CL		 112 { Opt_userspace, "retry=%s" },
113
f45663ce
CL		 114 { Opt_sloppy, "sloppy" },
115
bf0fd768
CL		 116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
d33e4dfe
CL		 118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
bf0fd768
CL		 120 { Opt_posix, "posix" },
121 { Opt_noposix, "noposix" },
122 { Opt_cto, "cto" },
123 { Opt_nocto, "nocto" },
124 { Opt_ac, "ac" },
125 { Opt_noac, "noac" },
126 { Opt_lock, "lock" },
127 { Opt_nolock, "nolock" },
128 { Opt_v2, "v2" },
129 { Opt_v3, "v3" },
130 { Opt_udp, "udp" },
131 { Opt_tcp, "tcp" },
2cf7ff7a 132 { Opt_rdma, "rdma" },
bf0fd768
CL		 133 { Opt_acl, "acl" },
134 { Opt_noacl, "noacl" },
135 { Opt_rdirplus, "rdirplus" },
136 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 137 { Opt_sharecache, "sharecache" },
138 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 139 { Opt_resvport, "resvport" },
140 { Opt_noresvport, "noresvport" },
b797cac7
DH		 141 { Opt_fscache, "fsc" },
142 { Opt_fscache_uniq, "fsc=%s" },
143 { Opt_nofscache, "nofsc" },
bf0fd768 144
a5a16bae
CL		 145 { Opt_port, "port=%s" },
146 { Opt_rsize, "rsize=%s" },
147 { Opt_wsize, "wsize=%s" },
148 { Opt_bsize, "bsize=%s" },
149 { Opt_timeo, "timeo=%s" },
150 { Opt_retrans, "retrans=%s" },
151 { Opt_acregmin, "acregmin=%s" },
152 { Opt_acregmax, "acregmax=%s" },
153 { Opt_acdirmin, "acdirmin=%s" },
154 { Opt_acdirmax, "acdirmax=%s" },
155 { Opt_actimeo, "actimeo=%s" },
156 { Opt_namelen, "namlen=%s" },
157 { Opt_mountport, "mountport=%s" },
158 { Opt_mountvers, "mountvers=%s" },
159 { Opt_nfsvers, "nfsvers=%s" },
160 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 161 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 162
163 { Opt_sec, "sec=%s" },
164 { Opt_proto, "proto=%s" },
165 { Opt_mountproto, "mountproto=%s" },
166 { Opt_addr, "addr=%s" },
167 { Opt_clientaddr, "clientaddr=%s" },
33832034 168 { Opt_mounthost, "mounthost=%s" },
0ac83779 169 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 170
7973c1f1
TM		 171 { Opt_lookupcache, "lookupcache=%s" },
172
bf0fd768
CL		 173 { Opt_err, NULL }
174};
175
176enum {
2cf7ff7a 177 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 178
179 Opt_xprt_err
180};
181
a447c093 182static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768
CL		 183 { Opt_xprt_udp, "udp" },
184 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 185 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 186
187 { Opt_xprt_err, NULL }
188};
189
190enum {
191 Opt_sec_none, Opt_sec_sys,
192 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
193 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
194 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
195
196 Opt_sec_err
197};
198
a447c093 199static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 200 { Opt_sec_none, "none" },
201 { Opt_sec_none, "null" },
202 { Opt_sec_sys, "sys" },
203
204 { Opt_sec_krb5, "krb5" },
205 { Opt_sec_krb5i, "krb5i" },
206 { Opt_sec_krb5p, "krb5p" },
207
208 { Opt_sec_lkey, "lkey" },
209 { Opt_sec_lkeyi, "lkeyi" },
210 { Opt_sec_lkeyp, "lkeyp" },
211
8d042218
OK		 212 { Opt_sec_spkm, "spkm3" },
213 { Opt_sec_spkmi, "spkm3i" },
214 { Opt_sec_spkmp, "spkm3p" },
215
bf0fd768
CL		 216 { Opt_sec_err, NULL }
217};
218
7973c1f1
TM		 219enum {
220 Opt_lookupcache_all, Opt_lookupcache_positive,
221 Opt_lookupcache_none,
222
223 Opt_lookupcache_err
224};
225
226static match_table_t nfs_lookupcache_tokens = {
227 { Opt_lookupcache_all, "all" },
228 { Opt_lookupcache_positive, "pos" },
229 { Opt_lookupcache_positive, "positive" },
230 { Opt_lookupcache_none, "none" },
231
232 { Opt_lookupcache_err, NULL }
233};
234
bf0fd768 235
42faad99 236static void nfs_umount_begin(struct super_block *);
816724e6 237static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 238static int nfs_show_options(struct seq_file *, struct vfsmount *);
239static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 240static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 241static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 242 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1 243static void nfs_kill_super(struct super_block *);
48b605f8 244static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 245
246static struct file_system_type nfs_fs_type = {
247 .owner = THIS_MODULE,
248 .name = "nfs",
249 .get_sb = nfs_get_sb,
250 .kill_sb = nfs_kill_super,
349457cc 251 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 252};
253
54ceac45 254struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 255 .owner = THIS_MODULE,
256 .name = "nfs",
54ceac45 257 .get_sb = nfs_xdev_get_sb,
f7b422b1 258 .kill_sb = nfs_kill_super,
349457cc 259 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 260};
261
ee9b6d61 262static const struct super_operations nfs_sops = {
f7b422b1
DH		 263 .alloc_inode = nfs_alloc_inode,
264 .destroy_inode = nfs_destroy_inode,
265 .write_inode = nfs_write_inode,
266 .statfs = nfs_statfs,
267 .clear_inode = nfs_clear_inode,
268 .umount_begin = nfs_umount_begin,
269 .show_options = nfs_show_options,
270 .show_stats = nfs_show_stats,
48b605f8 271 .remount_fs = nfs_remount,
f7b422b1
DH		 272};
273
274#ifdef CONFIG_NFS_V4
816724e6
TM		 275static int nfs4_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 277static int nfs4_remote_get_sb(struct file_system_type *fs_type,
278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 279static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
280 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
281static int nfs4_referral_get_sb(struct file_system_type *fs_type,
282 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 283static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
284 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 285static void nfs4_kill_super(struct super_block *sb);
286
287static struct file_system_type nfs4_fs_type = {
288 .owner = THIS_MODULE,
289 .name = "nfs4",
290 .get_sb = nfs4_get_sb,
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
c02d7adf
TM		 295static struct file_system_type nfs4_remote_fs_type = {
296 .owner = THIS_MODULE,
297 .name = "nfs4",
298 .get_sb = nfs4_remote_get_sb,
299 .kill_sb = nfs4_kill_super,
300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
301};
302
54ceac45 303struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 304 .owner = THIS_MODULE,
305 .name = "nfs4",
54ceac45 306 .get_sb = nfs4_xdev_get_sb,
f7b422b1 307 .kill_sb = nfs4_kill_super,
349457cc 308 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 309};
310
c02d7adf
TM		 311static struct file_system_type nfs4_remote_referral_fs_type = {
312 .owner = THIS_MODULE,
313 .name = "nfs4",
314 .get_sb = nfs4_remote_referral_get_sb,
315 .kill_sb = nfs4_kill_super,
316 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
317};
318
54ceac45 319struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 320 .owner = THIS_MODULE,
321 .name = "nfs4",
54ceac45 322 .get_sb = nfs4_referral_get_sb,
f7b422b1 323 .kill_sb = nfs4_kill_super,
349457cc 324 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 325};
326
ee9b6d61 327static const struct super_operations nfs4_sops = {
f7b422b1
DH		 328 .alloc_inode = nfs_alloc_inode,
329 .destroy_inode = nfs_destroy_inode,
330 .write_inode = nfs_write_inode,
331 .statfs = nfs_statfs,
332 .clear_inode = nfs4_clear_inode,
333 .umount_begin = nfs_umount_begin,
334 .show_options = nfs_show_options,
335 .show_stats = nfs_show_stats,
48b605f8 336 .remount_fs = nfs_remount,
f7b422b1
DH		 337};
338#endif
339
8e1f936b
RR		 340static struct shrinker acl_shrinker = {
341 .shrink = nfs_access_cache_shrinker,
342 .seeks = DEFAULT_SEEKS,
343};
979df72e 344
f7b422b1
DH		 345/*
346 * Register the NFS filesystems
347 */
348int __init register_nfs_fs(void)
349{
350 int ret;
351
352 ret = register_filesystem(&nfs_fs_type);
353 if (ret < 0)
354 goto error_0;
355
f7b422b1
DH		 356 ret = nfs_register_sysctl();
357 if (ret < 0)
358 goto error_1;
89a09141 359#ifdef CONFIG_NFS_V4
f7b422b1
DH		 360 ret = register_filesystem(&nfs4_fs_type);
361 if (ret < 0)
362 goto error_2;
363#endif
8e1f936b 364 register_shrinker(&acl_shrinker);
f7b422b1
DH		 365 return 0;
366
367#ifdef CONFIG_NFS_V4
368error_2:
369 nfs_unregister_sysctl();
89a09141 370#endif
f7b422b1
DH		 371error_1:
372 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 373error_0:
374 return ret;
375}
376
377/*
378 * Unregister the NFS filesystems
379 */
380void __exit unregister_nfs_fs(void)
381{
8e1f936b 382 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 383#ifdef CONFIG_NFS_V4
384 unregister_filesystem(&nfs4_fs_type);
f7b422b1 385#endif
49af7ee1 386 nfs_unregister_sysctl();
f7b422b1
DH		 387 unregister_filesystem(&nfs_fs_type);
388}
389
1daef0a8 390void nfs_sb_active(struct super_block *sb)
ef818a28 391{
1daef0a8 392 struct nfs_server *server = NFS_SB(sb);
ef818a28 393
1daef0a8
TM		 394 if (atomic_inc_return(&server->active) == 1)
395 atomic_inc(&sb->s_active);
ef818a28
SD		 396}
397
1daef0a8 398void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 399{
400 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 401
402 if (atomic_dec_and_test(&server->active))
403 deactivate_super(sb);
ef818a28
SD		 404}
405
f7b422b1
DH		 406/*
407 * Deliver file system statistics to userspace
408 */
816724e6 409static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 410{
0c7d90cf 411 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 412 unsigned char blockbits;
413 unsigned long blockres;
0c7d90cf 414 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 415 struct nfs_fattr fattr;
416 struct nfs_fsstat res = {
417 .fattr = &fattr,
418 };
419 int error;
420
8fa5c000 421 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 422 if (error < 0)
423 goto out_err;
1a0ba9ae 424 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 425
426 /*
427 * Current versions of glibc do not correctly handle the
428 * case where f_frsize != f_bsize. Eventually we want to
429 * report the value of wtmult in this field.
430 */
0c7d90cf 431 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 432
433 /*
434 * On most *nix systems, f_blocks, f_bfree, and f_bavail
435 * are reported in units of f_frsize. Linux hasn't had
436 * an f_frsize field in its statfs struct until recently,
437 * thus historically Linux's sys_statfs reports these
438 * fields in units of f_bsize.
439 */
0c7d90cf
DH		 440 buf->f_bsize = dentry->d_sb->s_blocksize;
441 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 442 blockres = (1 << blockbits) - 1;
443 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
444 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
445 buf->f_bavail = (res.abytes + blockres) >> blockbits;
446
447 buf->f_files = res.tfiles;
448 buf->f_ffree = res.afiles;
449
450 buf->f_namelen = server->namelen;
1a0ba9ae 451
f7b422b1
DH		 452 return 0;
453
454 out_err:
3110ff80 455 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 456 return error;
f7b422b1
DH		 457}
458
7d4e2747
DH		 459/*
460 * Map the security flavour number to a name
461 */
81039f1f
TM		 462static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
463{
7d4e2747 464 static const struct {
81039f1f
TM		 465 rpc_authflavor_t flavour;
466 const char *str;
467 } sec_flavours[] = {
468 { RPC_AUTH_NULL, "null" },
469 { RPC_AUTH_UNIX, "sys" },
470 { RPC_AUTH_GSS_KRB5, "krb5" },
471 { RPC_AUTH_GSS_KRB5I, "krb5i" },
472 { RPC_AUTH_GSS_KRB5P, "krb5p" },
473 { RPC_AUTH_GSS_LKEY, "lkey" },
474 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
475 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
476 { RPC_AUTH_GSS_SPKM, "spkm" },
477 { RPC_AUTH_GSS_SPKMI, "spkmi" },
478 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 479 { UINT_MAX, "unknown" }
81039f1f
TM		 480 };
481 int i;
482
4d81cd16 483 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 484 if (sec_flavours[i].flavour == flavour)
485 break;
486 }
487 return sec_flavours[i].str;
488}
489
82d101d5
CL		 490static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
491 int showdefaults)
492{
493 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
494
495 switch (sap->sa_family) {
496 case AF_INET: {
497 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 498 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 499 break;
500 }
501 case AF_INET6: {
502 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
5b095d98 503 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
82d101d5
CL		 504 break;
505 }
506 default:
507 if (showdefaults)
508 seq_printf(m, ",mountaddr=unspecified");
509 }
510
511 if (nfss->mountd_version || showdefaults)
512 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
513 if (nfss->mountd_port || showdefaults)
514 seq_printf(m, ",mountport=%u", nfss->mountd_port);
515
516 switch (nfss->mountd_protocol) {
517 case IPPROTO_UDP:
518 seq_printf(m, ",mountproto=udp");
519 break;
520 case IPPROTO_TCP:
521 seq_printf(m, ",mountproto=tcp");
522 break;
523 default:
524 if (showdefaults)
525 seq_printf(m, ",mountproto=auto");
526 }
527}
528
f7b422b1
DH		 529/*
530 * Describe the mount options in force on this server representation
531 */
82d101d5
CL		 532static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
533 int showdefaults)
f7b422b1 534{
509de811 535 static const struct proc_nfs_info {
f7b422b1 536 int flag;
509de811
DH		 537 const char *str;
538 const char *nostr;
f7b422b1
DH		 539 } nfs_info[] = {
540 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 541 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 542 { NFS_MOUNT_NOCTO, ",nocto", "" },
543 { NFS_MOUNT_NOAC, ",noac", "" },
544 { NFS_MOUNT_NONLM, ",nolock", "" },
545 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 546 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 547 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
548 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 549 { 0, NULL, NULL }
550 };
509de811 551 const struct proc_nfs_info *nfs_infop;
8fa5c000 552 struct nfs_client *clp = nfss->nfs_client;
82d101d5 553 u32 version = clp->rpc_ops->version;
f7b422b1 554
82d101d5 555 seq_printf(m, ",vers=%u", version);
2d767432
CL		 556 seq_printf(m, ",rsize=%u", nfss->rsize);
557 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 558 if (nfss->bsize != 0)
559 seq_printf(m, ",bsize=%u", nfss->bsize);
560 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 561 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 562 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 563 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 564 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 565 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 566 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 567 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 568 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 569 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
570 if (nfss->flags & nfs_infop->flag)
571 seq_puts(m, nfs_infop->str);
572 else
573 seq_puts(m, nfs_infop->nostr);
574 }
56928edd
TT		 575 seq_printf(m, ",proto=%s",
576 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 577 if (version == 4) {
578 if (nfss->port != NFS_PORT)
579 seq_printf(m, ",port=%u", nfss->port);
580 } else
581 if (nfss->port)
582 seq_printf(m, ",port=%u", nfss->port);
583
33170233
TM		 584 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
585 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 586 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 587
588 if (version != 4)
589 nfs_show_mountd_options(m, nfss, showdefaults);
590
591#ifdef CONFIG_NFS_V4
592 if (clp->rpc_ops->version == 4)
593 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
594#endif
b797cac7
DH		 595 if (nfss->options & NFS_OPTION_FSCACHE)
596 seq_printf(m, ",fsc");
f7b422b1
DH		 597}
598
599/*
600 * Describe the mount options on this VFS mountpoint
601 */
602static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
603{
604 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
605
606 nfs_show_mount_options(m, nfss, 0);
607
5d8515ca
CL		 608 seq_printf(m, ",addr=%s",
609 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
610 RPC_DISPLAY_ADDR));
f7b422b1
DH		 611
612 return 0;
613}
614
615/*
616 * Present statistical information for this VFS mountpoint
617 */
618static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
619{
620 int i, cpu;
621 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
622 struct rpc_auth *auth = nfss->client->cl_auth;
623 struct nfs_iostats totals = { };
624
625 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
626
627 /*
628 * Display all mount option settings
629 */
630 seq_printf(m, "\n\topts:\t");
631 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
632 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
633 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
634 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
635 nfs_show_mount_options(m, nfss, 1);
636
637 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
638
639 seq_printf(m, "\n\tcaps:\t");
640 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 641 seq_printf(m, ",wtmult=%u", nfss->wtmult);
642 seq_printf(m, ",dtsize=%u", nfss->dtsize);
643 seq_printf(m, ",bsize=%u", nfss->bsize);
644 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 645
646#ifdef CONFIG_NFS_V4
40c55319 647 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 648 seq_printf(m, "\n\tnfsv4:\t");
649 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
650 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
651 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
652 }
653#endif
654
655 /*
656 * Display security flavor in effect for this mount
657 */
2d767432 658 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 659 if (auth->au_flavor)
2d767432 660 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 661
662 /*
663 * Display superblock I/O counters
664 */
665 for_each_possible_cpu(cpu) {
666 struct nfs_iostats *stats;
667
668 preempt_disable();
669 stats = per_cpu_ptr(nfss->io_stats, cpu);
670
671 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
672 totals.events[i] += stats->events[i];
673 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
674 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 675#ifdef CONFIG_NFS_FSCACHE
676 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
677 totals.fscache[i] += stats->fscache[i];
678#endif
f7b422b1
DH		 679
680 preempt_enable();
681 }
682
683 seq_printf(m, "\n\tevents:\t");
684 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
685 seq_printf(m, "%lu ", totals.events[i]);
686 seq_printf(m, "\n\tbytes:\t");
687 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
688 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 689#ifdef CONFIG_NFS_FSCACHE
690 if (nfss->options & NFS_OPTION_FSCACHE) {
691 seq_printf(m, "\n\tfsc:\t");
692 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
693 seq_printf(m, "%Lu ", totals.bytes[i]);
694 }
695#endif
f7b422b1
DH		 696 seq_printf(m, "\n");
697
698 rpc_print_iostats(m, nfss->client);
699
700 return 0;
701}
702
703/*
704 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 705 * in response to xdev traversals and referrals
f7b422b1 706 */
42faad99 707static void nfs_umount_begin(struct super_block *sb)
f7b422b1 708{
67e55205 709 struct nfs_server *server;
fc6ae3cf
TM		 710 struct rpc_clnt *rpc;
711
67e55205
AIB		 712 lock_kernel();
713
714 server = NFS_SB(sb);
fc6ae3cf
TM		 715 /* -EIO all pending I/O */
716 rpc = server->client_acl;
717 if (!IS_ERR(rpc))
718 rpc_killall_tasks(rpc);
719 rpc = server->client;
720 if (!IS_ERR(rpc))
721 rpc_killall_tasks(rpc);
67e55205
AIB		 722
723 unlock_kernel();
f7b422b1
DH		 724}
725
fc50d58f 726/*
cdcd7f9a
CL		 727 * Sanity-check a server address provided by the mount command.
728 *
729 * Address family must be initialized, and address must not be
730 * the ANY address for that family.
fc50d58f
CL		 731 */
732static int nfs_verify_server_address(struct sockaddr *addr)
733{
734 switch (addr->sa_family) {
735 case AF_INET: {
cdcd7f9a 736 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 737 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 738 }
739 case AF_INET6: {
740 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
741 return !ipv6_addr_any(sa);
fc50d58f
CL		 742 }
743 }
744
745 return 0;
746}
747
ce3b7e19
CL		 748static void nfs_parse_ipv4_address(char *string, size_t str_len,
749 struct sockaddr *sap, size_t *addr_len)
9412b927 750{
ce3b7e19
CL		 751 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
752 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
9412b927 753
ce3b7e19
CL		 754 if (str_len <= INET_ADDRSTRLEN) {
755 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
756 (int)str_len, string);
757
758 sin->sin_family = AF_INET;
759 *addr_len = sizeof(*sin);
760 if (in4_pton(string, str_len, addr, '\0', NULL))
3c7c7e48 761 return;
ce3b7e19
CL		 762 }
763
764 sap->sa_family = AF_UNSPEC;
765 *addr_len = 0;
766}
767
768#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5e2e7721
CL		 769static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
770 const char *delim,
771 struct sockaddr_in6 *sin6)
d8e7748a
CL		 772{
773 char *p;
774 size_t len;
775
5e2e7721
CL		 776 if ((string + str_len) == delim)
777 return 1;
778
d8e7748a 779 if (*delim != IPV6_SCOPE_DELIMITER)
5e2e7721
CL		 780 return 0;
781
782 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
783 return 0;
d8e7748a
CL		 784
785 len = (string + str_len) - delim - 1;
786 p = kstrndup(delim + 1, len, GFP_KERNEL);
787 if (p) {
788 unsigned long scope_id = 0;
789 struct net_device *dev;
790
791 dev = dev_get_by_name(&init_net, p);
792 if (dev != NULL) {
793 scope_id = dev->ifindex;
794 dev_put(dev);
795 } else {
5e2e7721
CL		 796 if (strict_strtoul(p, 10, &scope_id) == 0) {
797 kfree(p);
798 return 0;
799 }
d8e7748a
CL		 800 }
801
802 kfree(p);
5e2e7721 803
d8e7748a
CL		 804 sin6->sin6_scope_id = scope_id;
805 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
5e2e7721 806 return 1;
d8e7748a 807 }
5e2e7721
CL		 808
809 return 0;
d8e7748a
CL		 810}
811
ce3b7e19
CL		 812static void nfs_parse_ipv6_address(char *string, size_t str_len,
813 struct sockaddr *sap, size_t *addr_len)
814{
815 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
816 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
d8e7748a 817 const char *delim;
ce3b7e19
CL		 818
819 if (str_len <= INET6_ADDRSTRLEN) {
820 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
821 (int)str_len, string);
3c7c7e48 822
ce3b7e19
CL		 823 sin6->sin6_family = AF_INET6;
824 *addr_len = sizeof(*sin6);
5e2e7721
CL		 825 if (in6_pton(string, str_len, addr,
826 IPV6_SCOPE_DELIMITER, &delim) != 0) {
827 if (nfs_parse_ipv6_scope_id(string, str_len,
828 delim, sin6) != 0)
829 return;
d8e7748a 830 }
3c7c7e48 831 }
9412b927
CL		 832
833 sap->sa_family = AF_UNSPEC;
ce3b7e19
CL		 834 *addr_len = 0;
835}
836#else
837static void nfs_parse_ipv6_address(char *string, size_t str_len,
838 struct sockaddr *sap, size_t *addr_len)
839{
840 sap->sa_family = AF_UNSPEC;
841 *addr_len = 0;
842}
843#endif
844
845/*
846 * Construct a sockaddr based on the contents of a string that contains
847 * an IP address in presentation format.
848 *
849 * If there is a problem constructing the new sockaddr, set the address
850 * family to AF_UNSPEC.
851 */
ea31a443 852void nfs_parse_ip_address(char *string, size_t str_len,
ce3b7e19
CL		 853 struct sockaddr *sap, size_t *addr_len)
854{
855 unsigned int i, colons;
856
857 colons = 0;
858 for (i = 0; i < str_len; i++)
859 if (string[i] == ':')
860 colons++;
861
862 if (colons >= 2)
863 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
864 else
865 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
9412b927
CL		 866}
867
259875ef
TM		 868/*
869 * Sanity check the NFS transport protocol.
870 *
871 */
872static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
873{
874 switch (mnt->nfs_server.protocol) {
875 case XPRT_TRANSPORT_UDP:
876 case XPRT_TRANSPORT_TCP:
877 case XPRT_TRANSPORT_RDMA:
878 break;
879 default:
880 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
881 }
882}
883
884/*
885 * For text based NFSv2/v3 mounts, the mount protocol transport default
886 * settings should depend upon the specified NFS transport.
887 */
888static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
889{
890 nfs_validate_transport_protocol(mnt);
891
892 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
893 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
894 return;
895 switch (mnt->nfs_server.protocol) {
896 case XPRT_TRANSPORT_UDP:
897 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
898 break;
899 case XPRT_TRANSPORT_TCP:
900 case XPRT_TRANSPORT_RDMA:
901 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
902 }
903}
904
01060c89
CL		 905/*
906 * Parse the value of the 'sec=' option.
907 *
dd07c947 908 * The flavor_len setting is for v4 mounts.
01060c89
CL		 909 */
910static int nfs_parse_security_flavors(char *value,
911 struct nfs_parsed_mount_data *mnt)
912{
913 substring_t args[MAX_OPT_ARGS];
914
915 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
916
917 switch (match_token(value, nfs_secflavor_tokens, args)) {
918 case Opt_sec_none:
01060c89
CL		 919 mnt->auth_flavor_len = 0;
920 mnt->auth_flavors[0] = RPC_AUTH_NULL;
921 break;
922 case Opt_sec_sys:
01060c89
CL		 923 mnt->auth_flavor_len = 0;
924 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
925 break;
926 case Opt_sec_krb5:
01060c89
CL		 927 mnt->auth_flavor_len = 1;
928 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
929 break;
930 case Opt_sec_krb5i:
01060c89
CL		 931 mnt->auth_flavor_len = 1;
932 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
933 break;
934 case Opt_sec_krb5p:
01060c89
CL		 935 mnt->auth_flavor_len = 1;
936 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
937 break;
938 case Opt_sec_lkey:
01060c89
CL		 939 mnt->auth_flavor_len = 1;
940 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
941 break;
942 case Opt_sec_lkeyi:
01060c89
CL		 943 mnt->auth_flavor_len = 1;
944 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
945 break;
946 case Opt_sec_lkeyp:
01060c89
CL		 947 mnt->auth_flavor_len = 1;
948 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
949 break;
950 case Opt_sec_spkm:
01060c89
CL		 951 mnt->auth_flavor_len = 1;
952 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
953 break;
954 case Opt_sec_spkmi:
01060c89
CL		 955 mnt->auth_flavor_len = 1;
956 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
957 break;
958 case Opt_sec_spkmp:
01060c89
CL		 959 mnt->auth_flavor_len = 1;
960 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
961 break;
962 default:
963 return 0;
964 }
965
966 return 1;
967}
968
bf0fd768
CL		 969/*
970 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 971 * a data structure. The whole mount string is processed; bad options are
972 * skipped as they are encountered. If there were no errors, return 1;
973 * otherwise return 0 (zero).
bf0fd768
CL		 974 */
975static int nfs_parse_mount_options(char *raw,
976 struct nfs_parsed_mount_data *mnt)
977{
f9c3a380 978 char *p, *string, *secdata;
d23c45fd 979 int rc, sloppy = 0, invalid_option = 0;
bf0fd768
CL		 980
981 if (!raw) {
982 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
983 return 1;
984 }
985 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
986
f9c3a380
EP		 987 secdata = alloc_secdata();
988 if (!secdata)
989 goto out_nomem;
990
991 rc = security_sb_copy_data(raw, secdata);
992 if (rc)
993 goto out_security_failure;
994
995 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
996 if (rc)
997 goto out_security_failure;
998
999 free_secdata(secdata);
1000
bf0fd768
CL		 1001 while ((p = strsep(&raw, ",")) != NULL) {
1002 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1003 unsigned long option;
1004 int token;
bf0fd768
CL		 1005
1006 if (!*p)
1007 continue;
1008
1009 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1010
1011 token = match_token(p, nfs_mount_option_tokens, args);
1012 switch (token) {
f45663ce
CL		 1013
1014 /*
1015 * boolean options: foo/nofoo
1016 */
bf0fd768
CL		 1017 case Opt_soft:
1018 mnt->flags |= NFS_MOUNT_SOFT;
1019 break;
1020 case Opt_hard:
1021 mnt->flags &= ~NFS_MOUNT_SOFT;
1022 break;
bf0fd768
CL		 1023 case Opt_posix:
1024 mnt->flags |= NFS_MOUNT_POSIX;
1025 break;
1026 case Opt_noposix:
1027 mnt->flags &= ~NFS_MOUNT_POSIX;
1028 break;
1029 case Opt_cto:
1030 mnt->flags &= ~NFS_MOUNT_NOCTO;
1031 break;
1032 case Opt_nocto:
1033 mnt->flags |= NFS_MOUNT_NOCTO;
1034 break;
1035 case Opt_ac:
1036 mnt->flags &= ~NFS_MOUNT_NOAC;
1037 break;
1038 case Opt_noac:
1039 mnt->flags |= NFS_MOUNT_NOAC;
1040 break;
1041 case Opt_lock:
1042 mnt->flags &= ~NFS_MOUNT_NONLM;
1043 break;
1044 case Opt_nolock:
1045 mnt->flags |= NFS_MOUNT_NONLM;
1046 break;
1047 case Opt_v2:
1048 mnt->flags &= ~NFS_MOUNT_VER3;
1049 break;
1050 case Opt_v3:
1051 mnt->flags |= NFS_MOUNT_VER3;
1052 break;
1053 case Opt_udp:
1054 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1055 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1056 break;
1057 case Opt_tcp:
1058 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1059 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1060 break;
2cf7ff7a
TT		 1061 case Opt_rdma:
1062 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1063 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1064 xprt_load_transport(p);
2cf7ff7a 1065 break;
bf0fd768
CL		 1066 case Opt_acl:
1067 mnt->flags &= ~NFS_MOUNT_NOACL;
1068 break;
1069 case Opt_noacl:
1070 mnt->flags |= NFS_MOUNT_NOACL;
1071 break;
1072 case Opt_rdirplus:
1073 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1074 break;
1075 case Opt_nordirplus:
1076 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1077 break;
75180df2
TM		 1078 case Opt_sharecache:
1079 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1080 break;
1081 case Opt_nosharecache:
1082 mnt->flags |= NFS_MOUNT_UNSHARED;
1083 break;
d740351b
CL		 1084 case Opt_resvport:
1085 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1086 break;
1087 case Opt_noresvport:
1088 mnt->flags |= NFS_MOUNT_NORESVPORT;
1089 break;
b797cac7
DH		 1090 case Opt_fscache:
1091 mnt->options |= NFS_OPTION_FSCACHE;
1092 kfree(mnt->fscache_uniq);
1093 mnt->fscache_uniq = NULL;
1094 break;
1095 case Opt_nofscache:
1096 mnt->options &= ~NFS_OPTION_FSCACHE;
1097 kfree(mnt->fscache_uniq);
1098 mnt->fscache_uniq = NULL;
1099 break;
1100 case Opt_fscache_uniq:
1101 string = match_strdup(args);
1102 if (!string)
1103 goto out_nomem;
1104 kfree(mnt->fscache_uniq);
1105 mnt->fscache_uniq = string;
1106 mnt->options |= NFS_OPTION_FSCACHE;
1107 break;
bf0fd768 1108
f45663ce
CL		 1109 /*
1110 * options that take numeric values
1111 */
bf0fd768 1112 case Opt_port:
a5a16bae
CL		 1113 string = match_strdup(args);
1114 if (string == NULL)
1115 goto out_nomem;
1116 rc = strict_strtoul(string, 10, &option);
1117 kfree(string);
1118 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1119 goto out_invalid_value;
1120 mnt->nfs_server.port = option;
bf0fd768
CL		 1121 break;
1122 case Opt_rsize:
a5a16bae
CL		 1123 string = match_strdup(args);
1124 if (string == NULL)
1125 goto out_nomem;
1126 rc = strict_strtoul(string, 10, &option);
1127 kfree(string);
1128 if (rc != 0)
d23c45fd
CL		 1129 goto out_invalid_value;
1130 mnt->rsize = option;
bf0fd768
CL		 1131 break;
1132 case Opt_wsize:
a5a16bae
CL		 1133 string = match_strdup(args);
1134 if (string == NULL)
1135 goto out_nomem;
1136 rc = strict_strtoul(string, 10, &option);
1137 kfree(string);
1138 if (rc != 0)
d23c45fd
CL		 1139 goto out_invalid_value;
1140 mnt->wsize = option;
bf0fd768
CL		 1141 break;
1142 case Opt_bsize:
a5a16bae
CL		 1143 string = match_strdup(args);
1144 if (string == NULL)
1145 goto out_nomem;
1146 rc = strict_strtoul(string, 10, &option);
1147 kfree(string);
1148 if (rc != 0)
d23c45fd
CL		 1149 goto out_invalid_value;
1150 mnt->bsize = option;
bf0fd768
CL		 1151 break;
1152 case Opt_timeo:
a5a16bae
CL		 1153 string = match_strdup(args);
1154 if (string == NULL)
1155 goto out_nomem;
1156 rc = strict_strtoul(string, 10, &option);
1157 kfree(string);
1158 if (rc != 0 || option == 0)
d23c45fd
CL		 1159 goto out_invalid_value;
1160 mnt->timeo = option;
bf0fd768
CL		 1161 break;
1162 case Opt_retrans:
a5a16bae
CL		 1163 string = match_strdup(args);
1164 if (string == NULL)
1165 goto out_nomem;
1166 rc = strict_strtoul(string, 10, &option);
1167 kfree(string);
1168 if (rc != 0 || option == 0)
d23c45fd
CL		 1169 goto out_invalid_value;
1170 mnt->retrans = option;
bf0fd768
CL		 1171 break;
1172 case Opt_acregmin:
a5a16bae
CL		 1173 string = match_strdup(args);
1174 if (string == NULL)
1175 goto out_nomem;
1176 rc = strict_strtoul(string, 10, &option);
1177 kfree(string);
1178 if (rc != 0)
d23c45fd
CL		 1179 goto out_invalid_value;
1180 mnt->acregmin = option;
bf0fd768
CL		 1181 break;
1182 case Opt_acregmax:
a5a16bae
CL		 1183 string = match_strdup(args);
1184 if (string == NULL)
1185 goto out_nomem;
1186 rc = strict_strtoul(string, 10, &option);
1187 kfree(string);
1188 if (rc != 0)
d23c45fd
CL		 1189 goto out_invalid_value;
1190 mnt->acregmax = option;
bf0fd768
CL		 1191 break;
1192 case Opt_acdirmin:
a5a16bae
CL		 1193 string = match_strdup(args);
1194 if (string == NULL)
1195 goto out_nomem;
1196 rc = strict_strtoul(string, 10, &option);
1197 kfree(string);
1198 if (rc != 0)
d23c45fd
CL		 1199 goto out_invalid_value;
1200 mnt->acdirmin = option;
bf0fd768
CL		 1201 break;
1202 case Opt_acdirmax:
a5a16bae
CL		 1203 string = match_strdup(args);
1204 if (string == NULL)
1205 goto out_nomem;
1206 rc = strict_strtoul(string, 10, &option);
1207 kfree(string);
1208 if (rc != 0)
d23c45fd
CL		 1209 goto out_invalid_value;
1210 mnt->acdirmax = option;
bf0fd768
CL		 1211 break;
1212 case Opt_actimeo:
a5a16bae
CL		 1213 string = match_strdup(args);
1214 if (string == NULL)
1215 goto out_nomem;
1216 rc = strict_strtoul(string, 10, &option);
1217 kfree(string);
1218 if (rc != 0)
d23c45fd
CL		 1219 goto out_invalid_value;
1220 mnt->acregmin = mnt->acregmax =
1221 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1222 break;
1223 case Opt_namelen:
a5a16bae
CL		 1224 string = match_strdup(args);
1225 if (string == NULL)
1226 goto out_nomem;
1227 rc = strict_strtoul(string, 10, &option);
1228 kfree(string);
1229 if (rc != 0)
d23c45fd
CL		 1230 goto out_invalid_value;
1231 mnt->namlen = option;
bf0fd768
CL		 1232 break;
1233 case Opt_mountport:
a5a16bae
CL		 1234 string = match_strdup(args);
1235 if (string == NULL)
1236 goto out_nomem;
1237 rc = strict_strtoul(string, 10, &option);
1238 kfree(string);
1239 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1240 goto out_invalid_value;
1241 mnt->mount_server.port = option;
bf0fd768 1242 break;
bf0fd768 1243 case Opt_mountvers:
a5a16bae
CL		 1244 string = match_strdup(args);
1245 if (string == NULL)
1246 goto out_nomem;
1247 rc = strict_strtoul(string, 10, &option);
1248 kfree(string);
1249 if (rc != 0 ||
f45663ce 1250 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1251 option > NFS_MNT3_VERSION)
1252 goto out_invalid_value;
1253 mnt->mount_server.version = option;
bf0fd768 1254 break;
bf0fd768 1255 case Opt_nfsvers:
a5a16bae
CL		 1256 string = match_strdup(args);
1257 if (string == NULL)
1258 goto out_nomem;
1259 rc = strict_strtoul(string, 10, &option);
1260 kfree(string);
1261 if (rc != 0)
d23c45fd 1262 goto out_invalid_value;
bf0fd768 1263 switch (option) {
f45663ce 1264 case NFS2_VERSION:
bf0fd768
CL		 1265 mnt->flags &= ~NFS_MOUNT_VER3;
1266 break;
f45663ce 1267 case NFS3_VERSION:
bf0fd768
CL		 1268 mnt->flags |= NFS_MOUNT_VER3;
1269 break;
1270 default:
d23c45fd 1271 goto out_invalid_value;
bf0fd768
CL		 1272 }
1273 break;
3fd5be9e 1274 case Opt_minorversion:
f3f4f4ed
CL		 1275 string = match_strdup(args);
1276 if (string == NULL)
1277 goto out_nomem;
1278 rc = strict_strtoul(string, 10, &option);
1279 kfree(string);
1280 if (rc != 0)
1281 goto out_invalid_value;
1282 if (option > NFS4_MAX_MINOR_VERSION)
1283 goto out_invalid_value;
1284 mnt->minorversion = option;
3fd5be9e 1285 break;
bf0fd768 1286
f45663ce
CL		 1287 /*
1288 * options that take text values
1289 */
bf0fd768
CL		 1290 case Opt_sec:
1291 string = match_strdup(args);
1292 if (string == NULL)
1293 goto out_nomem;
01060c89 1294 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1295 kfree(string);
f45663ce 1296 if (!rc) {
f45663ce
CL		 1297 dfprintk(MOUNT, "NFS: unrecognized "
1298 "security flavor\n");
d23c45fd 1299 return 0;
f45663ce 1300 }
bf0fd768
CL		 1301 break;
1302 case Opt_proto:
1303 string = match_strdup(args);
1304 if (string == NULL)
1305 goto out_nomem;
1306 token = match_token(string,
1307 nfs_xprt_protocol_tokens, args);
bf0fd768
CL		 1308
1309 switch (token) {
fdb66ff4 1310 case Opt_xprt_udp:
bf0fd768 1311 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1312 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1313 kfree(string);
bf0fd768 1314 break;
fdb66ff4 1315 case Opt_xprt_tcp:
bf0fd768 1316 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1317 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1318 kfree(string);
bf0fd768 1319 break;
2cf7ff7a
TT		 1320 case Opt_xprt_rdma:
1321 /* vector side protocols to TCP */
1322 mnt->flags |= NFS_MOUNT_TCP;
1323 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1324 xprt_load_transport(string);
d23c45fd 1325 kfree(string);
2cf7ff7a 1326 break;
bf0fd768 1327 default:
f45663ce
CL		 1328 dfprintk(MOUNT, "NFS: unrecognized "
1329 "transport protocol\n");
d23c45fd 1330 return 0;
bf0fd768
CL		 1331 }
1332 break;
1333 case Opt_mountproto:
1334 string = match_strdup(args);
1335 if (string == NULL)
1336 goto out_nomem;
1337 token = match_token(string,
1338 nfs_xprt_protocol_tokens, args);
d508afb4 1339 kfree(string);
bf0fd768
CL		 1340
1341 switch (token) {
fdb66ff4 1342 case Opt_xprt_udp:
0896a725 1343 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1344 break;
fdb66ff4 1345 case Opt_xprt_tcp:
0896a725 1346 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1347 break;
2cf7ff7a 1348 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1349 default:
f45663ce
CL		 1350 dfprintk(MOUNT, "NFS: unrecognized "
1351 "transport protocol\n");
d23c45fd 1352 return 0;
bf0fd768
CL		 1353 }
1354 break;
1355 case Opt_addr:
1356 string = match_strdup(args);
1357 if (string == NULL)
1358 goto out_nomem;
ce3b7e19
CL		 1359 nfs_parse_ip_address(string, strlen(string),
1360 (struct sockaddr *)
1361 &mnt->nfs_server.address,
1362 &mnt->nfs_server.addrlen);
bf0fd768
CL		 1363 kfree(string);
1364 break;
1365 case Opt_clientaddr:
1366 string = match_strdup(args);
1367 if (string == NULL)
1368 goto out_nomem;
fc601477 1369 kfree(mnt->client_address);
bf0fd768
CL		 1370 mnt->client_address = string;
1371 break;
33832034
CL		 1372 case Opt_mounthost:
1373 string = match_strdup(args);
1374 if (string == NULL)
1375 goto out_nomem;
fc601477 1376 kfree(mnt->mount_server.hostname);
33832034
CL		 1377 mnt->mount_server.hostname = string;
1378 break;
0ac83779 1379 case Opt_mountaddr:
bf0fd768
CL		 1380 string = match_strdup(args);
1381 if (string == NULL)
1382 goto out_nomem;
ce3b7e19
CL		 1383 nfs_parse_ip_address(string, strlen(string),
1384 (struct sockaddr *)
1385 &mnt->mount_server.address,
1386 &mnt->mount_server.addrlen);
bf0fd768
CL		 1387 kfree(string);
1388 break;
7973c1f1
TM		 1389 case Opt_lookupcache:
1390 string = match_strdup(args);
1391 if (string == NULL)
1392 goto out_nomem;
1393 token = match_token(string,
1394 nfs_lookupcache_tokens, args);
1395 kfree(string);
1396 switch (token) {
1397 case Opt_lookupcache_all:
1398 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1399 break;
1400 case Opt_lookupcache_positive:
1401 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1402 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1403 break;
1404 case Opt_lookupcache_none:
1405 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1406 break;
1407 default:
7973c1f1
TM		 1408 dfprintk(MOUNT, "NFS: invalid "
1409 "lookupcache argument\n");
d23c45fd 1410 return 0;
7973c1f1
TM		 1411 };
1412 break;
bf0fd768 1413
f45663ce
CL		 1414 /*
1415 * Special options
1416 */
1417 case Opt_sloppy:
1418 sloppy = 1;
1419 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1420 break;
bf0fd768
CL		 1421 case Opt_userspace:
1422 case Opt_deprecated:
d33e4dfe
CL		 1423 dfprintk(MOUNT, "NFS: ignoring mount option "
1424 "'%s'\n", p);
bf0fd768
CL		 1425 break;
1426
1427 default:
d23c45fd 1428 invalid_option = 1;
f45663ce
CL		 1429 dfprintk(MOUNT, "NFS: unrecognized mount option "
1430 "'%s'\n", p);
bf0fd768
CL		 1431 }
1432 }
1433
d23c45fd
CL		 1434 if (!sloppy && invalid_option)
1435 return 0;
1436
bf0fd768
CL		 1437 return 1;
1438
d23c45fd
CL		 1439out_invalid_value:
1440 printk(KERN_INFO "NFS: bad mount option value specified: %s \n", p);
1441 return 0;
bf0fd768
CL		 1442out_nomem:
1443 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1444 return 0;
f9c3a380
EP		 1445out_security_failure:
1446 free_secdata(secdata);
1447 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1448 return 0;
bf0fd768
CL		 1449}
1450
0076d7b7
CL		 1451/*
1452 * Use the remote server's MOUNT service to request the NFS file handle
1453 * corresponding to the provided path.
1454 */
1455static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1456 struct nfs_fh *root_fh)
1457{
8e02f6b9 1458 unsigned int auth_flavor_len = 0;
c5d120f8
CL		 1459 struct nfs_mount_request request = {
1460 .sap = (struct sockaddr *)
1461 &args->mount_server.address,
1462 .dirpath = args->nfs_server.export_path,
1463 .protocol = args->mount_server.protocol,
1464 .fh = root_fh,
50a737f8 1465 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
8e02f6b9 1466 .auth_flav_len = &auth_flavor_len,
c5d120f8 1467 };
4c568017 1468 int status;
0076d7b7
CL		 1469
1470 if (args->mount_server.version == 0) {
1471 if (args->flags & NFS_MOUNT_VER3)
1472 args->mount_server.version = NFS_MNT3_VERSION;
1473 else
1474 args->mount_server.version = NFS_MNT_VERSION;
1475 }
c5d120f8 1476 request.version = args->mount_server.version;
0076d7b7 1477
33832034 1478 if (args->mount_server.hostname)
c5d120f8 1479 request.hostname = args->mount_server.hostname;
33832034 1480 else
c5d120f8 1481 request.hostname = args->nfs_server.hostname;
33832034 1482
0076d7b7
CL		 1483 /*
1484 * Construct the mount server's address.
1485 */
4c568017 1486 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1487 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1488 args->nfs_server.addrlen);
1489 args->mount_server.addrlen = args->nfs_server.addrlen;
1490 }
c5d120f8 1491 request.salen = args->mount_server.addrlen;
4c568017 1492
aad70007
JL		 1493 /*
1494 * autobind will be used if mount_server.port == 0
1495 */
c5d120f8 1496 nfs_set_port(request.sap, args->mount_server.port);
0076d7b7
CL		 1497
1498 /*
1499 * Now ask the mount server to map our export path
1500 * to a file handle.
1501 */
c5d120f8 1502 status = nfs_mount(&request);
efd8340b
CL		 1503 if (status == 0)
1504 return 0;
0076d7b7 1505
396cee97 1506 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
c5d120f8 1507 request.hostname, status);
0076d7b7
CL		 1508 return status;
1509}
1510
d1aa0825
CL		 1511static int nfs_parse_simple_hostname(const char *dev_name,
1512 char **hostname, size_t maxnamlen,
1513 char **export_path, size_t maxpathlen)
dc045898
CL		 1514{
1515 size_t len;
1516 char *colon, *comma;
1517
1518 colon = strchr(dev_name, ':');
1519 if (colon == NULL)
1520 goto out_bad_devname;
1521
1522 len = colon - dev_name;
1523 if (len > maxnamlen)
1524 goto out_hostname;
1525
1526 /* N.B. caller will free nfs_server.hostname in all cases */
1527 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1528 if (!*hostname)
1529 goto out_nomem;
1530
1531 /* kill possible hostname list: not supported */
1532 comma = strchr(*hostname, ',');
1533 if (comma != NULL) {
1534 if (comma == *hostname)
1535 goto out_bad_devname;
1536 *comma = '\0';
1537 }
1538
1539 colon++;
1540 len = strlen(colon);
1541 if (len > maxpathlen)
1542 goto out_path;
1543 *export_path = kstrndup(colon, len, GFP_KERNEL);
1544 if (!*export_path)
1545 goto out_nomem;
1546
1547 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1548 return 0;
1549
1550out_bad_devname:
1551 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1552 return -EINVAL;
1553
1554out_nomem:
1555 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1556 return -ENOMEM;
1557
1558out_hostname:
1559 dfprintk(MOUNT, "NFS: server hostname too long\n");
1560 return -ENAMETOOLONG;
1561
1562out_path:
1563 dfprintk(MOUNT, "NFS: export pathname too long\n");
1564 return -ENAMETOOLONG;
1565}
1566
d1aa0825
CL		 1567/*
1568 * Hostname has square brackets around it because it contains one or
1569 * more colons. We look for the first closing square bracket, and a
1570 * colon must follow it.
1571 */
1572static int nfs_parse_protected_hostname(const char *dev_name,
1573 char **hostname, size_t maxnamlen,
1574 char **export_path, size_t maxpathlen)
1575{
1576 size_t len;
1577 char *start, *end;
1578
1579 start = (char *)(dev_name + 1);
1580
1581 end = strchr(start, ']');
1582 if (end == NULL)
1583 goto out_bad_devname;
1584 if (*(end + 1) != ':')
1585 goto out_bad_devname;
1586
1587 len = end - start;
1588 if (len > maxnamlen)
1589 goto out_hostname;
1590
1591 /* N.B. caller will free nfs_server.hostname in all cases */
1592 *hostname = kstrndup(start, len, GFP_KERNEL);
1593 if (*hostname == NULL)
1594 goto out_nomem;
1595
1596 end += 2;
1597 len = strlen(end);
1598 if (len > maxpathlen)
1599 goto out_path;
1600 *export_path = kstrndup(end, len, GFP_KERNEL);
1601 if (!*export_path)
1602 goto out_nomem;
1603
1604 return 0;
1605
1606out_bad_devname:
1607 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1608 return -EINVAL;
1609
1610out_nomem:
1611 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1612 return -ENOMEM;
1613
1614out_hostname:
1615 dfprintk(MOUNT, "NFS: server hostname too long\n");
1616 return -ENAMETOOLONG;
1617
1618out_path:
1619 dfprintk(MOUNT, "NFS: export pathname too long\n");
1620 return -ENAMETOOLONG;
1621}
1622
1623/*
1624 * Split "dev_name" into "hostname:export_path".
1625 *
1626 * The leftmost colon demarks the split between the server's hostname
1627 * and the export path. If the hostname starts with a left square
1628 * bracket, then it may contain colons.
1629 *
1630 * Note: caller frees hostname and export path, even on error.
1631 */
1632static int nfs_parse_devname(const char *dev_name,
1633 char **hostname, size_t maxnamlen,
1634 char **export_path, size_t maxpathlen)
1635{
1636 if (*dev_name == '[')
1637 return nfs_parse_protected_hostname(dev_name,
1638 hostname, maxnamlen,
1639 export_path, maxpathlen);
1640
1641 return nfs_parse_simple_hostname(dev_name,
1642 hostname, maxnamlen,
1643 export_path, maxpathlen);
1644}
1645
f7b422b1 1646/*
54ceac45
DH		 1647 * Validate the NFS2/NFS3 mount data
1648 * - fills in the mount root filehandle
136d558c
CL		 1649 *
1650 * For option strings, user space handles the following behaviors:
1651 *
1652 * + DNS: mapping server host name to IP address ("addr=" option)
1653 *
1654 * + failure mode: how to behave if a mount request can't be handled
1655 * immediately ("fg/bg" option)
1656 *
1657 * + retry: how often to retry a mount request ("retry=" option)
1658 *
1659 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1660 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1661 */
2283f8d6
TT		 1662static int nfs_validate_mount_data(void *options,
1663 struct nfs_parsed_mount_data *args,
136d558c
CL		 1664 struct nfs_fh *mntfh,
1665 const char *dev_name)
f7b422b1 1666{
2283f8d6 1667 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
136d558c 1668
5df36e78
CL		 1669 if (data == NULL)
1670 goto out_no_data;
f7b422b1 1671
2283f8d6
TT		 1672 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1673 args->rsize = NFS_MAX_FILE_IO_SIZE;
1674 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1675 args->acregmin = NFS_DEF_ACREGMIN;
1676 args->acregmax = NFS_DEF_ACREGMAX;
1677 args->acdirmin = NFS_DEF_ACDIRMIN;
1678 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 1679 args->mount_server.port = 0; /* autobind unless user sets port */
f22d6d79 1680 args->nfs_server.port = 0; /* autobind unless user sets port */
0896a725 1681 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1682 args->auth_flavors[0] = RPC_AUTH_UNIX;
2283f8d6 1683
54ceac45 1684 switch (data->version) {
5df36e78
CL		 1685 case 1:
1686 data->namlen = 0;
1687 case 2:
1688 data->bsize = 0;
1689 case 3:
1690 if (data->flags & NFS_MOUNT_VER3)
1691 goto out_no_v3;
1692 data->root.size = NFS2_FHSIZE;
1693 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1694 case 4:
1695 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1696 goto out_no_sec;
1697 case 5:
1698 memset(data->context, 0, sizeof(data->context));
1699 case 6:
b7e24457
TM		 1700 if (data->flags & NFS_MOUNT_VER3) {
1701 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1702 goto out_invalid_fh;
5df36e78 1703 mntfh->size = data->root.size;
b7e24457 1704 } else
5df36e78
CL		 1705 mntfh->size = NFS2_FHSIZE;
1706
5df36e78
CL		 1707
1708 memcpy(mntfh->data, data->root.data, mntfh->size);
1709 if (mntfh->size < sizeof(mntfh->data))
1710 memset(mntfh->data + mntfh->size, 0,
1711 sizeof(mntfh->data) - mntfh->size);
6e88e061 1712
2283f8d6
TT		 1713 /*
1714 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1715 * can deal with.
1716 */
ff3525a5 1717 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1718 args->rsize = data->rsize;
1719 args->wsize = data->wsize;
2283f8d6
TT		 1720 args->timeo = data->timeo;
1721 args->retrans = data->retrans;
1722 args->acregmin = data->acregmin;
1723 args->acregmax = data->acregmax;
1724 args->acdirmin = data->acdirmin;
1725 args->acdirmax = data->acdirmax;
4c568017
CL		 1726
1727 memcpy(&args->nfs_server.address, &data->addr,
1728 sizeof(data->addr));
1729 args->nfs_server.addrlen = sizeof(data->addr);
1730 if (!nfs_verify_server_address((struct sockaddr *)
1731 &args->nfs_server.address))
1732 goto out_no_address;
1733
2283f8d6 1734 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1735 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1736 /* N.B. caller will free nfs_server.hostname in all cases */
1737 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1738 args->namlen = data->namlen;
1739 args->bsize = data->bsize;
dd07c947
CL		 1740
1741 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1742 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1743 if (!args->nfs_server.hostname)
1744 goto out_nomem;
f9c3a380
EP		 1745
1746 /*
1747 * The legacy version 6 binary mount data from userspace has a
1748 * field used only to transport selinux information into the
1749 * the kernel. To continue to support that functionality we
1750 * have a touch of selinux knowledge here in the NFS code. The
1751 * userspace code converted context=blah to just blah so we are
1752 * converting back to the full string selinux understands.
1753 */
1754 if (data->context[0]){
1755#ifdef CONFIG_SECURITY_SELINUX
1756 int rc;
1757 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1758 if (!opts_str)
1759 return -ENOMEM;
1760 strcpy(opts_str, "context=");
1761 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1762 strcat(opts_str, &data->context[0]);
1763 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1764 kfree(opts_str);
1765 if (rc)
1766 return rc;
1767#else
1768 return -EINVAL;
1769#endif
1770 }
1771
5df36e78 1772 break;
136d558c 1773 default: {
136d558c 1774 int status;
136d558c 1775
2283f8d6
TT		 1776 if (nfs_parse_mount_options((char *)options, args) == 0)
1777 return -EINVAL;
136d558c 1778
6e88e061
CL		 1779 if (!nfs_verify_server_address((struct sockaddr *)
1780 &args->nfs_server.address))
1781 goto out_no_address;
1782
ed596a8a
CL		 1783 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1784 args->nfs_server.port);
1785
259875ef
TM		 1786 nfs_set_mount_transport_protocol(args);
1787
dc045898
CL		 1788 status = nfs_parse_devname(dev_name,
1789 &args->nfs_server.hostname,
1790 PAGE_SIZE,
1791 &args->nfs_server.export_path,
1792 NFS_MAXPATHLEN);
1793 if (!status)
1794 status = nfs_try_mount(args, mntfh);
136d558c 1795
dc045898
CL		 1796 kfree(args->nfs_server.export_path);
1797 args->nfs_server.export_path = NULL;
136d558c 1798
136d558c 1799 if (status)
fdc6e2c8 1800 return status;
136d558c 1801
136d558c
CL		 1802 break;
1803 }
f7b422b1 1804 }
54ceac45
DH		 1805
1806#ifndef CONFIG_NFS_V3
2283f8d6 1807 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1808 goto out_v3_not_compiled;
1809#endif /* !CONFIG_NFS_V3 */
f7b422b1 1810
5df36e78 1811 return 0;
f7b422b1 1812
5df36e78
CL		 1813out_no_data:
1814 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1815 return -EINVAL;
54ceac45 1816
5df36e78
CL		 1817out_no_v3:
1818 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1819 data->version);
1820 return -EINVAL;
f7b422b1 1821
5df36e78
CL		 1822out_no_sec:
1823 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1824 return -EINVAL;
1825
5df36e78
CL		 1826#ifndef CONFIG_NFS_V3
1827out_v3_not_compiled:
1828 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1829 return -EPROTONOSUPPORT;
1830#endif /* !CONFIG_NFS_V3 */
1831
63649bd7
CG		 1832out_nomem:
1833 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1834 return -ENOMEM;
1835
5df36e78
CL		 1836out_no_address:
1837 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1838 return -EINVAL;
1839
1840out_invalid_fh:
1841 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1842 return -EINVAL;
f7b422b1
DH		 1843}
1844
48b605f8
JL		 1845static int
1846nfs_compare_remount_data(struct nfs_server *nfss,
1847 struct nfs_parsed_mount_data *data)
1848{
1849 if (data->flags != nfss->flags ||
1850 data->rsize != nfss->rsize ||
1851 data->wsize != nfss->wsize ||
1852 data->retrans != nfss->client->cl_timeout->to_retries ||
1853 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1854 data->acregmin != nfss->acregmin / HZ ||
1855 data->acregmax != nfss->acregmax / HZ ||
1856 data->acdirmin != nfss->acdirmin / HZ ||
1857 data->acdirmax != nfss->acdirmax / HZ ||
1858 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1859 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1860 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1861 data->nfs_server.addrlen) != 0)
1862 return -EINVAL;
1863
1864 return 0;
1865}
1866
1867static int
1868nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1869{
1870 int error;
1871 struct nfs_server *nfss = sb->s_fs_info;
1872 struct nfs_parsed_mount_data *data;
1873 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1874 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1875 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1876
1877 /*
1878 * Userspace mount programs that send binary options generally send
1879 * them populated with default values. We have no way to know which
1880 * ones were explicitly specified. Fall back to legacy behavior and
1881 * just return success.
1882 */
31c94469
MZ		 1883 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1884 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1885 options->version <= 6))))
48b605f8
JL		 1886 return 0;
1887
1888 data = kzalloc(sizeof(*data), GFP_KERNEL);
1889 if (data == NULL)
1890 return -ENOMEM;
1891
337eb00a 1892 lock_kernel();
48b605f8
JL		 1893 /* fill out struct with values from existing mount */
1894 data->flags = nfss->flags;
1895 data->rsize = nfss->rsize;
1896 data->wsize = nfss->wsize;
1897 data->retrans = nfss->client->cl_timeout->to_retries;
1898 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1899 data->acregmin = nfss->acregmin / HZ;
1900 data->acregmax = nfss->acregmax / HZ;
1901 data->acdirmin = nfss->acdirmin / HZ;
1902 data->acdirmax = nfss->acdirmax / HZ;
1903 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1904 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1905 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1906 data->nfs_server.addrlen);
1907
1908 /* overwrite those values with any that were specified */
1909 error = nfs_parse_mount_options((char *)options, data);
1910 if (error < 0)
1911 goto out;
1912
1913 /* compare new mount options with old ones */
1914 error = nfs_compare_remount_data(nfss, data);
1915out:
1916 kfree(data);
337eb00a 1917 unlock_kernel();
48b605f8
JL		 1918 return error;
1919}
1920
f7b422b1 1921/*
54ceac45 1922 * Initialise the common bits of the superblock
f7b422b1 1923 */
54ceac45 1924static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1925{
54ceac45 1926 struct nfs_server *server = NFS_SB(sb);
5006a76c 1927
54ceac45 1928 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1929
54ceac45
DH		 1930 /* We probably want something more informative here */
1931 snprintf(sb->s_id, sizeof(sb->s_id),
1932 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1933
54ceac45
DH		 1934 if (sb->s_blocksize == 0)
1935 sb->s_blocksize = nfs_block_bits(server->wsize,
1936 &sb->s_blocksize_bits);
f7b422b1 1937
54ceac45
DH		 1938 if (server->flags & NFS_MOUNT_NOAC)
1939 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1940
54ceac45 1941 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1942}
1943
1944/*
54ceac45 1945 * Finish setting up an NFS2/3 superblock
f7b422b1 1946 */
2283f8d6
TT		 1947static void nfs_fill_super(struct super_block *sb,
1948 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1949{
1950 struct nfs_server *server = NFS_SB(sb);
5006a76c 1951
54ceac45
DH		 1952 sb->s_blocksize_bits = 0;
1953 sb->s_blocksize = 0;
1954 if (data->bsize)
1955 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1956
54ceac45
DH		 1957 if (server->flags & NFS_MOUNT_VER3) {
1958 /* The VFS shouldn't apply the umask to mode bits. We will do
1959 * so ourselves when necessary.
1960 */
1961 sb->s_flags |= MS_POSIXACL;
1962 sb->s_time_gran = 1;
816724e6 1963 }
54ceac45
DH		 1964
1965 sb->s_op = &nfs_sops;
1966 nfs_initialise_sb(sb);
f7b422b1
DH		 1967}
1968
1969/*
54ceac45 1970 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1971 */
54ceac45
DH		 1972static void nfs_clone_super(struct super_block *sb,
1973 const struct super_block *old_sb)
f7b422b1 1974{
54ceac45
DH		 1975 struct nfs_server *server = NFS_SB(sb);
1976
1977 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1978 sb->s_blocksize = old_sb->s_blocksize;
1979 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1980
f7b422b1 1981 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1982 /* The VFS shouldn't apply the umask to mode bits. We will do
1983 * so ourselves when necessary.
f7b422b1
DH		 1984 */
1985 sb->s_flags |= MS_POSIXACL;
f7b422b1 1986 sb->s_time_gran = 1;
f7b422b1
DH		 1987 }
1988
54ceac45
DH		 1989 sb->s_op = old_sb->s_op;
1990 nfs_initialise_sb(sb);
f7b422b1
DH		 1991}
1992
275a5d24
TM		 1993static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1994{
1995 const struct nfs_server *a = s->s_fs_info;
1996 const struct rpc_clnt *clnt_a = a->client;
1997 const struct rpc_clnt *clnt_b = b->client;
1998
1999 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2000 goto Ebusy;
2001 if (a->nfs_client != b->nfs_client)
2002 goto Ebusy;
2003 if (a->flags != b->flags)
2004 goto Ebusy;
2005 if (a->wsize != b->wsize)
2006 goto Ebusy;
2007 if (a->rsize != b->rsize)
2008 goto Ebusy;
2009 if (a->acregmin != b->acregmin)
2010 goto Ebusy;
2011 if (a->acregmax != b->acregmax)
2012 goto Ebusy;
2013 if (a->acdirmin != b->acdirmin)
2014 goto Ebusy;
2015 if (a->acdirmax != b->acdirmax)
2016 goto Ebusy;
2017 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2018 goto Ebusy;
e89a5a43 2019 return 1;
275a5d24 2020Ebusy:
e89a5a43
TM		 2021 return 0;
2022}
2023
2024struct nfs_sb_mountdata {
2025 struct nfs_server *server;
2026 int mntflags;
2027};
2028
2029static int nfs_set_super(struct super_block *s, void *data)
2030{
2031 struct nfs_sb_mountdata *sb_mntdata = data;
2032 struct nfs_server *server = sb_mntdata->server;
2033 int ret;
2034
2035 s->s_flags = sb_mntdata->mntflags;
2036 s->s_fs_info = server;
2037 ret = set_anon_super(s, server);
2038 if (ret == 0)
2039 server->s_dev = s->s_dev;
2040 return ret;
2041}
2042
fd00a8ff
CL		 2043static int nfs_compare_super_address(struct nfs_server *server1,
2044 struct nfs_server *server2)
2045{
2046 struct sockaddr *sap1, *sap2;
2047
2048 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2049 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2050
2051 if (sap1->sa_family != sap2->sa_family)
2052 return 0;
2053
2054 switch (sap1->sa_family) {
2055 case AF_INET: {
2056 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2057 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2058 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2059 return 0;
2060 if (sin1->sin_port != sin2->sin_port)
2061 return 0;
2062 break;
2063 }
2064 case AF_INET6: {
2065 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2066 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2067 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2068 return 0;
2069 if (sin1->sin6_port != sin2->sin6_port)
2070 return 0;
2071 break;
2072 }
2073 default:
2074 return 0;
2075 }
2076
2077 return 1;
2078}
2079
e89a5a43
TM		 2080static int nfs_compare_super(struct super_block *sb, void *data)
2081{
2082 struct nfs_sb_mountdata *sb_mntdata = data;
2083 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2084 int mntflags = sb_mntdata->mntflags;
2085
fd00a8ff 2086 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2087 return 0;
2088 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2089 if (old->flags & NFS_MOUNT_UNSHARED)
2090 return 0;
2091 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2092 return 0;
2093 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2094}
2095
fa799759
MS		 2096static int nfs_bdi_register(struct nfs_server *server)
2097{
2098 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2099}
2100
816724e6
TM		 2101static int nfs_get_sb(struct file_system_type *fs_type,
2102 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2103{
f7b422b1
DH		 2104 struct nfs_server *server = NULL;
2105 struct super_block *s;
33852a1f
TM		 2106 struct nfs_parsed_mount_data *data;
2107 struct nfs_fh *mntfh;
54ceac45 2108 struct dentry *mntroot;
75180df2 2109 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2110 struct nfs_sb_mountdata sb_mntdata = {
2111 .mntflags = flags,
2112 };
33852a1f
TM		 2113 int error = -ENOMEM;
2114
2115 data = kzalloc(sizeof(*data), GFP_KERNEL);
2116 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2117 if (data == NULL || mntfh == NULL)
2118 goto out_free_fh;
f7b422b1 2119
33852a1f 2120 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2121
54ceac45 2122 /* Validate the mount data */
33852a1f 2123 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2124 if (error < 0)
0655960f 2125 goto out;
f7b422b1 2126
54ceac45 2127 /* Get a volume representation */
33852a1f 2128 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2129 if (IS_ERR(server)) {
2130 error = PTR_ERR(server);
0655960f 2131 goto out;
f7b422b1 2132 }
e89a5a43 2133 sb_mntdata.server = server;
f7b422b1 2134
75180df2
TM		 2135 if (server->flags & NFS_MOUNT_UNSHARED)
2136 compare_super = NULL;
2137
54ceac45 2138 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2139 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2140 if (IS_ERR(s)) {
2141 error = PTR_ERR(s);
54ceac45 2142 goto out_err_nosb;
816724e6
TM		 2143 }
2144
54ceac45
DH		 2145 if (s->s_fs_info != server) {
2146 nfs_free_server(server);
2147 server = NULL;
fa799759
MS		 2148 } else {
2149 error = nfs_bdi_register(server);
2150 if (error)
2151 goto error_splat_super;
54ceac45 2152 }
f7b422b1 2153
54ceac45
DH		 2154 if (!s->s_root) {
2155 /* initial superblock/root creation */
33852a1f 2156 nfs_fill_super(s, data);
08734048 2157 nfs_fscache_get_super_cookie(s, data);
54ceac45 2158 }
f7b422b1 2159
33852a1f 2160 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2161 if (IS_ERR(mntroot)) {
2162 error = PTR_ERR(mntroot);
2163 goto error_splat_super;
f7b422b1 2164 }
816724e6 2165
33852a1f 2166 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2167 if (error)
2168 goto error_splat_root;
2169
54ceac45
DH		 2170 s->s_flags |= MS_ACTIVE;
2171 mnt->mnt_sb = s;
2172 mnt->mnt_root = mntroot;
0655960f
CL		 2173 error = 0;
2174
2175out:
33852a1f
TM		 2176 kfree(data->nfs_server.hostname);
2177 kfree(data->mount_server.hostname);
08734048 2178 kfree(data->fscache_uniq);
33852a1f
TM		 2179 security_free_mnt_opts(&data->lsm_opts);
2180out_free_fh:
2181 kfree(mntfh);
2182 kfree(data);
0655960f 2183 return error;
816724e6 2184
54ceac45
DH		 2185out_err_nosb:
2186 nfs_free_server(server);
0655960f 2187 goto out;
54ceac45 2188
f9c3a380
EP		 2189error_splat_root:
2190 dput(mntroot);
54ceac45 2191error_splat_super:
6f5bbff9 2192 deactivate_locked_super(s);
0655960f 2193 goto out;
f7b422b1
DH		 2194}
2195
54ceac45
DH		 2196/*
2197 * Destroy an NFS2/3 superblock
2198 */
f7b422b1
DH		 2199static void nfs_kill_super(struct super_block *s)
2200{
2201 struct nfs_server *server = NFS_SB(s);
2202
fa799759 2203 bdi_unregister(&server->backing_dev_info);
f7b422b1 2204 kill_anon_super(s);
08734048 2205 nfs_fscache_release_super_cookie(s);
54ceac45 2206 nfs_free_server(server);
f7b422b1
DH		 2207}
2208
54ceac45
DH		 2209/*
2210 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2211 */
2212static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2213 const char *dev_name, void *raw_data,
2214 struct vfsmount *mnt)
f7b422b1
DH		 2215{
2216 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2217 struct super_block *s;
2218 struct nfs_server *server;
2219 struct dentry *mntroot;
75180df2 2220 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2221 struct nfs_sb_mountdata sb_mntdata = {
2222 .mntflags = flags,
2223 };
54ceac45 2224 int error;
f7b422b1 2225
54ceac45 2226 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2227
54ceac45
DH		 2228 /* create a new volume representation */
2229 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2230 if (IS_ERR(server)) {
2231 error = PTR_ERR(server);
2232 goto out_err_noserver;
2233 }
e89a5a43 2234 sb_mntdata.server = server;
8fa5c000 2235
75180df2
TM		 2236 if (server->flags & NFS_MOUNT_UNSHARED)
2237 compare_super = NULL;
2238
54ceac45 2239 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2240 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2241 if (IS_ERR(s)) {
2242 error = PTR_ERR(s);
2243 goto out_err_nosb;
2244 }
5006a76c 2245
54ceac45
DH		 2246 if (s->s_fs_info != server) {
2247 nfs_free_server(server);
2248 server = NULL;
fa799759
MS		 2249 } else {
2250 error = nfs_bdi_register(server);
2251 if (error)
2252 goto error_splat_super;
f7b422b1 2253 }
24c8dbbb 2254
54ceac45
DH		 2255 if (!s->s_root) {
2256 /* initial superblock/root creation */
54ceac45
DH		 2257 nfs_clone_super(s, data->sb);
2258 }
f7b422b1 2259
54ceac45
DH		 2260 mntroot = nfs_get_root(s, data->fh);
2261 if (IS_ERR(mntroot)) {
2262 error = PTR_ERR(mntroot);
2263 goto error_splat_super;
f7b422b1 2264 }
e9cc6c23 2265 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2266 dput(mntroot);
2267 error = -ESTALE;
2268 goto error_splat_super;
2269 }
f7b422b1 2270
54ceac45
DH		 2271 s->s_flags |= MS_ACTIVE;
2272 mnt->mnt_sb = s;
2273 mnt->mnt_root = mntroot;
f7b422b1 2274
f9c3a380
EP		 2275 /* clone any lsm security options from the parent to the new sb */
2276 security_sb_clone_mnt_opts(data->sb, s);
2277
54ceac45
DH		 2278 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2279 return 0;
24c8dbbb 2280
54ceac45
DH		 2281out_err_nosb:
2282 nfs_free_server(server);
2283out_err_noserver:
2284 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2285 return error;
f7b422b1 2286
54ceac45 2287error_splat_super:
6f5bbff9 2288 deactivate_locked_super(s);
54ceac45
DH		 2289 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2290 return error;
f7b422b1
DH		 2291}
2292
54ceac45
DH		 2293#ifdef CONFIG_NFS_V4
2294
f7b422b1 2295/*
54ceac45 2296 * Finish setting up a cloned NFS4 superblock
f7b422b1 2297 */
54ceac45
DH		 2298static void nfs4_clone_super(struct super_block *sb,
2299 const struct super_block *old_sb)
f7b422b1 2300{
54ceac45
DH		 2301 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2302 sb->s_blocksize = old_sb->s_blocksize;
2303 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2304 sb->s_time_gran = 1;
54ceac45
DH		 2305 sb->s_op = old_sb->s_op;
2306 nfs_initialise_sb(sb);
f7b422b1
DH		 2307}
2308
54ceac45
DH		 2309/*
2310 * Set up an NFS4 superblock
2311 */
2312static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2313{
54ceac45
DH		 2314 sb->s_time_gran = 1;
2315 sb->s_op = &nfs4_sops;
2316 nfs_initialise_sb(sb);
f7b422b1
DH		 2317}
2318
01c3f052
TM		 2319static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2320{
2321 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2322}
2323
f0768ebd
CL		 2324/*
2325 * Validate NFSv4 mount options
2326 */
91ea40b9
TT		 2327static int nfs4_validate_mount_data(void *options,
2328 struct nfs_parsed_mount_data *args,
2329 const char *dev_name)
f0768ebd 2330{
4c568017 2331 struct sockaddr_in *ap;
91ea40b9 2332 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2333 char *c;
2334
2335 if (data == NULL)
2336 goto out_no_data;
2337
91ea40b9
TT		 2338 args->rsize = NFS_MAX_FILE_IO_SIZE;
2339 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2340 args->acregmin = NFS_DEF_ACREGMIN;
2341 args->acregmax = NFS_DEF_ACREGMAX;
2342 args->acdirmin = NFS_DEF_ACDIRMIN;
2343 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 2344 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
6738b251
CL		 2345 args->auth_flavors[0] = RPC_AUTH_UNIX;
2346 args->auth_flavor_len = 0;
3fd5be9e 2347 args->minorversion = 0;
91ea40b9 2348
f0768ebd
CL		 2349 switch (data->version) {
2350 case 1:
4c568017
CL		 2351 ap = (struct sockaddr_in *)&args->nfs_server.address;
2352 if (data->host_addrlen > sizeof(args->nfs_server.address))
2353 goto out_no_address;
2354 if (data->host_addrlen == 0)
f0768ebd 2355 goto out_no_address;
4c568017
CL		 2356 args->nfs_server.addrlen = data->host_addrlen;
2357 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
f0768ebd 2358 return -EFAULT;
91ea40b9
TT		 2359 if (!nfs_verify_server_address((struct sockaddr *)
2360 &args->nfs_server.address))
f0768ebd
CL		 2361 goto out_no_address;
2362
6738b251
CL		 2363 if (data->auth_flavourlen) {
2364 if (data->auth_flavourlen > 1)
2365 goto out_inval_auth;
20c71f5e 2366 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2367 data->auth_flavours,
20c71f5e 2368 sizeof(args->auth_flavors[0])))
f0768ebd 2369 return -EFAULT;
f0768ebd
CL		 2370 }
2371
2372 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2373 if (IS_ERR(c))
2374 return PTR_ERR(c);
91ea40b9 2375 args->nfs_server.hostname = c;
f0768ebd
CL		 2376
2377 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2378 if (IS_ERR(c))
2379 return PTR_ERR(c);
91ea40b9
TT		 2380 args->nfs_server.export_path = c;
2381 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2382
2383 c = strndup_user(data->client_addr.data, 16);
2384 if (IS_ERR(c))
2385 return PTR_ERR(c);
91ea40b9
TT		 2386 args->client_address = c;
2387
2388 /*
2389 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2390 * can deal with.
2391 */
2392
2393 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2394 args->rsize = data->rsize;
2395 args->wsize = data->wsize;
2396 args->timeo = data->timeo;
2397 args->retrans = data->retrans;
2398 args->acregmin = data->acregmin;
2399 args->acregmax = data->acregmax;
2400 args->acdirmin = data->acdirmin;
2401 args->acdirmax = data->acdirmax;
2402 args->nfs_server.protocol = data->proto;
259875ef 2403 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2404
2405 break;
80071225 2406 default: {
dc045898 2407 int status;
91ea40b9
TT		 2408
2409 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2410 return -EINVAL;
2411
2412 if (!nfs_verify_server_address((struct sockaddr *)
91ea40b9 2413 &args->nfs_server.address))
80071225 2414 return -EINVAL;
80071225 2415
ed596a8a
CL		 2416 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2417 args->nfs_server.port);
2418
259875ef
TM		 2419 nfs_validate_transport_protocol(args);
2420
01c3f052
TM		 2421 nfs4_validate_mount_flags(args);
2422
6738b251 2423 if (args->auth_flavor_len > 1)
80071225 2424 goto out_inval_auth;
80071225 2425
91ea40b9 2426 if (args->client_address == NULL)
0a87cf12
JL		 2427 goto out_no_client_address;
2428
dc045898
CL		 2429 status = nfs_parse_devname(dev_name,
2430 &args->nfs_server.hostname,
2431 NFS4_MAXNAMLEN,
2432 &args->nfs_server.export_path,
2433 NFS4_MAXPATHLEN);
2434 if (status < 0)
2435 return status;
2436
80071225
CL		 2437 break;
2438 }
f0768ebd
CL		 2439 }
2440
2441 return 0;
2442
2443out_no_data:
2444 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2445 return -EINVAL;
2446
2447out_inval_auth:
2448 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2449 data->auth_flavourlen);
2450 return -EINVAL;
2451
2452out_no_address:
2453 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2454 return -EINVAL;
0a87cf12
JL		 2455
2456out_no_client_address:
2457 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2458 return -EINVAL;
f0768ebd
CL		 2459}
2460
54ceac45 2461/*
c02d7adf 2462 * Get the superblock for the NFS4 root partition
54ceac45 2463 */
c02d7adf 2464static int nfs4_remote_get_sb(struct file_system_type *fs_type,
816724e6 2465 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2466{
c02d7adf 2467 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2468 struct super_block *s;
2469 struct nfs_server *server;
33852a1f 2470 struct nfs_fh *mntfh;
54ceac45 2471 struct dentry *mntroot;
75180df2 2472 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2473 struct nfs_sb_mountdata sb_mntdata = {
2474 .mntflags = flags,
2475 };
33852a1f
TM		 2476 int error = -ENOMEM;
2477
33852a1f
TM		 2478 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2479 if (data == NULL || mntfh == NULL)
2480 goto out_free_fh;
f7b422b1 2481
33852a1f 2482 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2483
54ceac45 2484 /* Get a volume representation */
33852a1f 2485 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2486 if (IS_ERR(server)) {
2487 error = PTR_ERR(server);
29eb981a 2488 goto out;
f7b422b1 2489 }
e89a5a43 2490 sb_mntdata.server = server;
f7b422b1 2491
75180df2
TM		 2492 if (server->flags & NFS4_MOUNT_UNSHARED)
2493 compare_super = NULL;
2494
54ceac45 2495 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2496 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2497 if (IS_ERR(s)) {
2498 error = PTR_ERR(s);
f7b422b1 2499 goto out_free;
816724e6
TM		 2500 }
2501
5dd3177a
TM		 2502 if (s->s_fs_info != server) {
2503 nfs_free_server(server);
2504 server = NULL;
fa799759
MS		 2505 } else {
2506 error = nfs_bdi_register(server);
2507 if (error)
2508 goto error_splat_super;
5dd3177a
TM		 2509 }
2510
54ceac45
DH		 2511 if (!s->s_root) {
2512 /* initial superblock/root creation */
54ceac45 2513 nfs4_fill_super(s);
08734048 2514 nfs_fscache_get_super_cookie(s, data);
54ceac45 2515 }
f7b422b1 2516
33852a1f 2517 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2518 if (IS_ERR(mntroot)) {
2519 error = PTR_ERR(mntroot);
2520 goto error_splat_super;
f7b422b1 2521 }
54ceac45 2522
33852a1f 2523 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2524 if (error)
2525 goto error_splat_root;
2526
f7b422b1 2527 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2528 mnt->mnt_sb = s;
2529 mnt->mnt_root = mntroot;
29eb981a
CL		 2530 error = 0;
2531
2532out:
33852a1f
TM		 2533 security_free_mnt_opts(&data->lsm_opts);
2534out_free_fh:
2535 kfree(mntfh);
29eb981a 2536 return error;
54ceac45 2537
f7b422b1 2538out_free:
54ceac45 2539 nfs_free_server(server);
29eb981a 2540 goto out;
54ceac45 2541
46c8ac74
EP		 2542error_splat_root:
2543 dput(mntroot);
54ceac45 2544error_splat_super:
6f5bbff9 2545 deactivate_locked_super(s);
29eb981a 2546 goto out;
f7b422b1
DH		 2547}
2548
c02d7adf
TM		 2549static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2550 int flags, void *data, const char *hostname)
2551{
2552 struct vfsmount *root_mnt;
2553 char *root_devname;
2554 size_t len;
2555
2556 len = strlen(hostname) + 3;
2557 root_devname = kmalloc(len, GFP_KERNEL);
2558 if (root_devname == NULL)
2559 return ERR_PTR(-ENOMEM);
2560 snprintf(root_devname, len, "%s:/", hostname);
2561 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2562 kfree(root_devname);
2563 return root_mnt;
2564}
2565
b88f8a54
TM		 2566static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2567{
2568 char *page = (char *) __get_free_page(GFP_KERNEL);
2569 char *devname, *tmp;
2570
2571 if (page == NULL)
2572 return;
2573 devname = nfs_path(path->mnt->mnt_devname,
2574 path->mnt->mnt_root, path->dentry,
2575 page, PAGE_SIZE);
2576 if (devname == NULL)
2577 goto out_freepage;
2578 tmp = kstrdup(devname, GFP_KERNEL);
2579 if (tmp == NULL)
2580 goto out_freepage;
2581 kfree(mnt->mnt_devname);
2582 mnt->mnt_devname = tmp;
2583out_freepage:
2584 free_page((unsigned long)page);
2585}
2586
c02d7adf
TM		 2587static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2588 const char *export_path, struct vfsmount *mnt_target)
2589{
2590 struct mnt_namespace *ns_private;
2591 struct nameidata nd;
2592 struct super_block *s;
2593 int ret;
2594
2595 ns_private = create_mnt_ns(root_mnt);
2596 ret = PTR_ERR(ns_private);
2597 if (IS_ERR(ns_private))
2598 goto out_mntput;
2599
2600 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2601 export_path, LOOKUP_FOLLOW, &nd);
2602
2603 put_mnt_ns(ns_private);
2604
2605 if (ret != 0)
2606 goto out_err;
2607
2608 s = nd.path.mnt->mnt_sb;
2609 atomic_inc(&s->s_active);
2610 mnt_target->mnt_sb = s;
2611 mnt_target->mnt_root = dget(nd.path.dentry);
2612
b88f8a54
TM		 2613 /* Correct the device pathname */
2614 nfs_fix_devname(&nd.path, mnt_target);
2615
c02d7adf
TM		 2616 path_put(&nd.path);
2617 down_write(&s->s_umount);
2618 return 0;
2619out_mntput:
2620 mntput(root_mnt);
2621out_err:
2622 return ret;
2623}
2624
2625/*
2626 * Get the superblock for an NFS4 mountpoint
2627 */
2628static int nfs4_get_sb(struct file_system_type *fs_type,
2629 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2630{
2631 struct nfs_parsed_mount_data *data;
2632 char *export_path;
2633 struct vfsmount *root_mnt;
2634 int error = -ENOMEM;
2635
2636 data = kzalloc(sizeof(*data), GFP_KERNEL);
2637 if (data == NULL)
2638 goto out_free_data;
2639
2640 /* Validate the mount data */
2641 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2642 if (error < 0)
2643 goto out;
2644
2645 export_path = data->nfs_server.export_path;
2646 data->nfs_server.export_path = "/";
2647 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2648 data->nfs_server.hostname);
2649 data->nfs_server.export_path = export_path;
2650
2651 error = PTR_ERR(root_mnt);
2652 if (IS_ERR(root_mnt))
2653 goto out;
2654
2655 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2656
2657out:
2658 kfree(data->client_address);
2659 kfree(data->nfs_server.export_path);
2660 kfree(data->nfs_server.hostname);
2661 kfree(data->fscache_uniq);
2662out_free_data:
2663 kfree(data);
2664 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2665 error != 0 ? " [error]" : "");
2666 return error;
2667}
2668
f7b422b1
DH		 2669static void nfs4_kill_super(struct super_block *sb)
2670{
2671 struct nfs_server *server = NFS_SB(sb);
2672
0f3e66c6 2673 dprintk("--> %s\n", __func__);
515d8611 2674 nfs_super_return_all_delegations(sb);
f7b422b1 2675 kill_anon_super(sb);
f7b422b1 2676 nfs4_renewd_prepare_shutdown(server);
08734048 2677 nfs_fscache_release_super_cookie(sb);
54ceac45 2678 nfs_free_server(server);
0f3e66c6 2679 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2680}
2681
2682/*
54ceac45 2683 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2684 */
54ceac45
DH		 2685static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2686 const char *dev_name, void *raw_data,
2687 struct vfsmount *mnt)
f7b422b1 2688{
54ceac45
DH		 2689 struct nfs_clone_mount *data = raw_data;
2690 struct super_block *s;
2691 struct nfs_server *server;
2692 struct dentry *mntroot;
75180df2 2693 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2694 struct nfs_sb_mountdata sb_mntdata = {
2695 .mntflags = flags,
2696 };
54ceac45 2697 int error;
f7b422b1 2698
54ceac45 2699 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2700
54ceac45
DH		 2701 /* create a new volume representation */
2702 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2703 if (IS_ERR(server)) {
2704 error = PTR_ERR(server);
2705 goto out_err_noserver;
f7b422b1 2706 }
e89a5a43 2707 sb_mntdata.server = server;
f7b422b1 2708
75180df2
TM		 2709 if (server->flags & NFS4_MOUNT_UNSHARED)
2710 compare_super = NULL;
2711
54ceac45 2712 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2713 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2714 if (IS_ERR(s)) {
2715 error = PTR_ERR(s);
2716 goto out_err_nosb;
f7b422b1 2717 }
f7b422b1 2718
54ceac45
DH		 2719 if (s->s_fs_info != server) {
2720 nfs_free_server(server);
2721 server = NULL;
fa799759
MS		 2722 } else {
2723 error = nfs_bdi_register(server);
2724 if (error)
2725 goto error_splat_super;
54ceac45 2726 }
f7b422b1 2727
54ceac45
DH		 2728 if (!s->s_root) {
2729 /* initial superblock/root creation */
54ceac45
DH		 2730 nfs4_clone_super(s, data->sb);
2731 }
f7b422b1 2732
54ceac45
DH		 2733 mntroot = nfs4_get_root(s, data->fh);
2734 if (IS_ERR(mntroot)) {
2735 error = PTR_ERR(mntroot);
2736 goto error_splat_super;
2737 }
e9cc6c23
TM		 2738 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2739 dput(mntroot);
2740 error = -ESTALE;
2741 goto error_splat_super;
2742 }
f7b422b1 2743
54ceac45
DH		 2744 s->s_flags |= MS_ACTIVE;
2745 mnt->mnt_sb = s;
2746 mnt->mnt_root = mntroot;
2747
46c8ac74
EP		 2748 security_sb_clone_mnt_opts(data->sb, s);
2749
54ceac45
DH		 2750 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2751 return 0;
2752
2753out_err_nosb:
2754 nfs_free_server(server);
2755out_err_noserver:
2756 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2757 return error;
2758
2759error_splat_super:
6f5bbff9 2760 deactivate_locked_super(s);
54ceac45
DH		 2761 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2762 return error;
f7b422b1
DH		 2763}
2764
c02d7adf
TM		 2765static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2766 int flags, const char *dev_name, void *raw_data,
2767 struct vfsmount *mnt)
f7b422b1
DH		 2768{
2769 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2770 struct super_block *s;
2771 struct nfs_server *server;
2772 struct dentry *mntroot;
2773 struct nfs_fh mntfh;
75180df2 2774 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2775 struct nfs_sb_mountdata sb_mntdata = {
2776 .mntflags = flags,
2777 };
54ceac45
DH		 2778 int error;
2779
2780 dprintk("--> nfs4_referral_get_sb()\n");
2781
2782 /* create a new volume representation */
2783 server = nfs4_create_referral_server(data, &mntfh);
2784 if (IS_ERR(server)) {
2785 error = PTR_ERR(server);
2786 goto out_err_noserver;
2787 }
e89a5a43 2788 sb_mntdata.server = server;
54ceac45 2789
75180df2
TM		 2790 if (server->flags & NFS4_MOUNT_UNSHARED)
2791 compare_super = NULL;
2792
54ceac45 2793 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2794 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2795 if (IS_ERR(s)) {
2796 error = PTR_ERR(s);
2797 goto out_err_nosb;
2798 }
2799
2800 if (s->s_fs_info != server) {
2801 nfs_free_server(server);
2802 server = NULL;
fa799759
MS		 2803 } else {
2804 error = nfs_bdi_register(server);
2805 if (error)
2806 goto error_splat_super;
54ceac45
DH		 2807 }
2808
2809 if (!s->s_root) {
2810 /* initial superblock/root creation */
54ceac45
DH		 2811 nfs4_fill_super(s);
2812 }
2813
f2d0d85e 2814 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2815 if (IS_ERR(mntroot)) {
2816 error = PTR_ERR(mntroot);
2817 goto error_splat_super;
2818 }
e9cc6c23
TM		 2819 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2820 dput(mntroot);
2821 error = -ESTALE;
2822 goto error_splat_super;
2823 }
54ceac45
DH		 2824
2825 s->s_flags |= MS_ACTIVE;
2826 mnt->mnt_sb = s;
2827 mnt->mnt_root = mntroot;
2828
46c8ac74
EP		 2829 security_sb_clone_mnt_opts(data->sb, s);
2830
54ceac45
DH		 2831 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2832 return 0;
2833
2834out_err_nosb:
2835 nfs_free_server(server);
2836out_err_noserver:
2837 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2838 return error;
2839
2840error_splat_super:
6f5bbff9 2841 deactivate_locked_super(s);
54ceac45
DH		 2842 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2843 return error;
f7b422b1
DH		 2844}
2845
c02d7adf
TM		 2846/*
2847 * Create an NFS4 server record on referral traversal
2848 */
2849static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2850 int flags, const char *dev_name, void *raw_data,
2851 struct vfsmount *mnt)
2852{
2853 struct nfs_clone_mount *data = raw_data;
2854 char *export_path;
2855 struct vfsmount *root_mnt;
2856 int error;
2857
2858 dprintk("--> nfs4_referral_get_sb()\n");
2859
2860 export_path = data->mnt_path;
2861 data->mnt_path = "/";
2862
2863 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2864 flags, data, data->hostname);
2865 data->mnt_path = export_path;
2866
2867 error = PTR_ERR(root_mnt);
2868 if (IS_ERR(root_mnt))
2869 goto out;
2870
2871 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2872out:
2873 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2874 error != 0 ? " [error]" : "");
2875 return error;
2876}
2877
54ceac45 2878#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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