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NFS: Mount option parser should detect missing "port="
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / super.c
blob05544336f7ded63f167033d1467a09e528caf83c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
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 *
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())
21 */
22
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>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
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/mnt_namespace.h>
46 #include <linux/namei.h>
47 #include <linux/nfs_idmap.h>
48 #include <linux/vfs.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
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"
65 #include "fscache.h"
66
67 #define NFSDBG_FACILITY NFSDBG_VFS
68
69 enum {
70 /* Mount options that take no arguments */
71 Opt_soft, Opt_hard,
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,
77 Opt_udp, Opt_tcp, Opt_rdma,
78 Opt_acl, Opt_noacl,
79 Opt_rdirplus, Opt_nordirplus,
80 Opt_sharecache, Opt_nosharecache,
81 Opt_resvport, Opt_noresvport,
82 Opt_fscache, Opt_nofscache,
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,
93 Opt_mountvers,
94 Opt_nfsvers,
95 Opt_minorversion,
96
97 /* Mount options that take string arguments */
98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
100 Opt_lookupcache,
101 Opt_fscache_uniq,
102
103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
105
106 Opt_err
107 };
108
109 static const match_table_t nfs_mount_option_tokens = {
110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
112 { Opt_userspace, "retry=%s" },
113
114 { Opt_sloppy, "sloppy" },
115
116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
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" },
132 { Opt_rdma, "rdma" },
133 { Opt_acl, "acl" },
134 { Opt_noacl, "noacl" },
135 { Opt_rdirplus, "rdirplus" },
136 { Opt_nordirplus, "nordirplus" },
137 { Opt_sharecache, "sharecache" },
138 { Opt_nosharecache, "nosharecache" },
139 { Opt_resvport, "resvport" },
140 { Opt_noresvport, "noresvport" },
141 { Opt_fscache, "fsc" },
142 { Opt_fscache_uniq, "fsc=%s" },
143 { Opt_nofscache, "nofsc" },
144
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" },
161 { Opt_minorversion, "minorversion=%s" },
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" },
168 { Opt_mounthost, "mounthost=%s" },
169 { Opt_mountaddr, "mountaddr=%s" },
170
171 { Opt_lookupcache, "lookupcache=%s" },
172
173 { Opt_err, NULL }
174 };
175
176 enum {
177 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
178
179 Opt_xprt_err
180 };
181
182 static const match_table_t nfs_xprt_protocol_tokens = {
183 { Opt_xprt_udp, "udp" },
184 { Opt_xprt_tcp, "tcp" },
185 { Opt_xprt_rdma, "rdma" },
186
187 { Opt_xprt_err, NULL }
188 };
189
190 enum {
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
199 static const match_table_t nfs_secflavor_tokens = {
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
212 { Opt_sec_spkm, "spkm3" },
213 { Opt_sec_spkmi, "spkm3i" },
214 { Opt_sec_spkmp, "spkm3p" },
215
216 { Opt_sec_err, NULL }
217 };
218
219 enum {
220 Opt_lookupcache_all, Opt_lookupcache_positive,
221 Opt_lookupcache_none,
222
223 Opt_lookupcache_err
224 };
225
226 static 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
235
236 static void nfs_umount_begin(struct super_block *);
237 static int nfs_statfs(struct dentry *, struct kstatfs *);
238 static int nfs_show_options(struct seq_file *, struct vfsmount *);
239 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
240 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
241 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
242 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
243 static void nfs_kill_super(struct super_block *);
244 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
245
246 static 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,
251 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
252 };
253
254 struct file_system_type nfs_xdev_fs_type = {
255 .owner = THIS_MODULE,
256 .name = "nfs",
257 .get_sb = nfs_xdev_get_sb,
258 .kill_sb = nfs_kill_super,
259 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
260 };
261
262 static const struct super_operations nfs_sops = {
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,
271 .remount_fs = nfs_remount,
272 };
273
274 #ifdef CONFIG_NFS_V4
275 static int nfs4_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
277 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
279 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
280 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
281 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
282 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
283 static 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);
285 static void nfs4_kill_super(struct super_block *sb);
286
287 static 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,
292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
293 };
294
295 static 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
303 struct file_system_type nfs4_xdev_fs_type = {
304 .owner = THIS_MODULE,
305 .name = "nfs4",
306 .get_sb = nfs4_xdev_get_sb,
307 .kill_sb = nfs4_kill_super,
308 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
309 };
310
311 static 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
319 struct file_system_type nfs4_referral_fs_type = {
320 .owner = THIS_MODULE,
321 .name = "nfs4",
322 .get_sb = nfs4_referral_get_sb,
323 .kill_sb = nfs4_kill_super,
324 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
325 };
326
327 static const struct super_operations nfs4_sops = {
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,
336 .remount_fs = nfs_remount,
337 };
338 #endif
339
340 static struct shrinker acl_shrinker = {
341 .shrink = nfs_access_cache_shrinker,
342 .seeks = DEFAULT_SEEKS,
343 };
344
345 /*
346 * Register the NFS filesystems
347 */
348 int __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
356 ret = nfs_register_sysctl();
357 if (ret < 0)
358 goto error_1;
359 #ifdef CONFIG_NFS_V4
360 ret = register_filesystem(&nfs4_fs_type);
361 if (ret < 0)
362 goto error_2;
363 #endif
364 register_shrinker(&acl_shrinker);
365 return 0;
366
367 #ifdef CONFIG_NFS_V4
368 error_2:
369 nfs_unregister_sysctl();
370 #endif
371 error_1:
372 unregister_filesystem(&nfs_fs_type);
373 error_0:
374 return ret;
375 }
376
377 /*
378 * Unregister the NFS filesystems
379 */
380 void __exit unregister_nfs_fs(void)
381 {
382 unregister_shrinker(&acl_shrinker);
383 #ifdef CONFIG_NFS_V4
384 unregister_filesystem(&nfs4_fs_type);
385 #endif
386 nfs_unregister_sysctl();
387 unregister_filesystem(&nfs_fs_type);
388 }
389
390 void nfs_sb_active(struct super_block *sb)
391 {
392 struct nfs_server *server = NFS_SB(sb);
393
394 if (atomic_inc_return(&server->active) == 1)
395 atomic_inc(&sb->s_active);
396 }
397
398 void nfs_sb_deactive(struct super_block *sb)
399 {
400 struct nfs_server *server = NFS_SB(sb);
401
402 if (atomic_dec_and_test(&server->active))
403 deactivate_super(sb);
404 }
405
406 /*
407 * Deliver file system statistics to userspace
408 */
409 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
410 {
411 struct nfs_server *server = NFS_SB(dentry->d_sb);
412 unsigned char blockbits;
413 unsigned long blockres;
414 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
415 struct nfs_fattr fattr;
416 struct nfs_fsstat res = {
417 .fattr = &fattr,
418 };
419 int error;
420
421 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
422 if (error < 0)
423 goto out_err;
424 buf->f_type = NFS_SUPER_MAGIC;
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 */
431 buf->f_frsize = dentry->d_sb->s_blocksize;
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 */
440 buf->f_bsize = dentry->d_sb->s_blocksize;
441 blockbits = dentry->d_sb->s_blocksize_bits;
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;
451
452 return 0;
453
454 out_err:
455 dprintk("%s: statfs error = %d\n", __func__, -error);
456 return error;
457 }
458
459 /*
460 * Map the security flavour number to a name
461 */
462 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
463 {
464 static const struct {
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" },
479 { UINT_MAX, "unknown" }
480 };
481 int i;
482
483 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
484 if (sec_flavours[i].flavour == flavour)
485 break;
486 }
487 return sec_flavours[i].str;
488 }
489
490 static 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;
498 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
499 break;
500 }
501 case AF_INET6: {
502 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
503 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
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
529 /*
530 * Describe the mount options in force on this server representation
531 */
532 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
533 int showdefaults)
534 {
535 static const struct proc_nfs_info {
536 int flag;
537 const char *str;
538 const char *nostr;
539 } nfs_info[] = {
540 { NFS_MOUNT_SOFT, ",soft", ",hard" },
541 { NFS_MOUNT_POSIX, ",posix", "" },
542 { NFS_MOUNT_NOCTO, ",nocto", "" },
543 { NFS_MOUNT_NOAC, ",noac", "" },
544 { NFS_MOUNT_NONLM, ",nolock", "" },
545 { NFS_MOUNT_NOACL, ",noacl", "" },
546 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
547 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
548 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
549 { 0, NULL, NULL }
550 };
551 const struct proc_nfs_info *nfs_infop;
552 struct nfs_client *clp = nfss->nfs_client;
553 u32 version = clp->rpc_ops->version;
554
555 seq_printf(m, ",vers=%u", version);
556 seq_printf(m, ",rsize=%u", nfss->rsize);
557 seq_printf(m, ",wsize=%u", nfss->wsize);
558 if (nfss->bsize != 0)
559 seq_printf(m, ",bsize=%u", nfss->bsize);
560 seq_printf(m, ",namlen=%u", nfss->namelen);
561 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
562 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
563 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
564 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
565 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
566 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
567 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
568 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
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 }
575 seq_printf(m, ",proto=%s",
576 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
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
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);
586 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
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
595 if (nfss->options & NFS_OPTION_FSCACHE)
596 seq_printf(m, ",fsc");
597 }
598
599 /*
600 * Describe the mount options on this VFS mountpoint
601 */
602 static 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
608 seq_printf(m, ",addr=%s",
609 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
610 RPC_DISPLAY_ADDR));
611
612 return 0;
613 }
614
615 /*
616 * Present statistical information for this VFS mountpoint
617 */
618 static 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);
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);
645
646 #ifdef CONFIG_NFS_V4
647 if (nfss->nfs_client->rpc_ops->version == 4) {
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 */
658 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
659 if (auth->au_flavor)
660 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
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];
675 #ifdef CONFIG_NFS_FSCACHE
676 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
677 totals.fscache[i] += stats->fscache[i];
678 #endif
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]);
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
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
705 * in response to xdev traversals and referrals
706 */
707 static void nfs_umount_begin(struct super_block *sb)
708 {
709 struct nfs_server *server;
710 struct rpc_clnt *rpc;
711
712 lock_kernel();
713
714 server = NFS_SB(sb);
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);
722
723 unlock_kernel();
724 }
725
726 /*
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.
731 */
732 static int nfs_verify_server_address(struct sockaddr *addr)
733 {
734 switch (addr->sa_family) {
735 case AF_INET: {
736 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
737 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
738 }
739 case AF_INET6: {
740 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
741 return !ipv6_addr_any(sa);
742 }
743 }
744
745 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
746 return 0;
747 }
748
749 /*
750 * Select between a default port value and a user-specified port value.
751 * If a zero value is set, then autobind will be used.
752 */
753 static void nfs_set_default_port(struct sockaddr *sap, const int parsed_port,
754 const unsigned short default_port)
755 {
756 unsigned short port = default_port;
757
758 if (parsed_port != NFS_UNSPEC_PORT)
759 port = parsed_port;
760
761 rpc_set_port(sap, port);
762 }
763
764 /*
765 * Sanity check the NFS transport protocol.
766 *
767 */
768 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
769 {
770 switch (mnt->nfs_server.protocol) {
771 case XPRT_TRANSPORT_UDP:
772 case XPRT_TRANSPORT_TCP:
773 case XPRT_TRANSPORT_RDMA:
774 break;
775 default:
776 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
777 }
778 }
779
780 /*
781 * For text based NFSv2/v3 mounts, the mount protocol transport default
782 * settings should depend upon the specified NFS transport.
783 */
784 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
785 {
786 nfs_validate_transport_protocol(mnt);
787
788 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
789 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
790 return;
791 switch (mnt->nfs_server.protocol) {
792 case XPRT_TRANSPORT_UDP:
793 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
794 break;
795 case XPRT_TRANSPORT_TCP:
796 case XPRT_TRANSPORT_RDMA:
797 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
798 }
799 }
800
801 /*
802 * Parse the value of the 'sec=' option.
803 */
804 static int nfs_parse_security_flavors(char *value,
805 struct nfs_parsed_mount_data *mnt)
806 {
807 substring_t args[MAX_OPT_ARGS];
808
809 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
810
811 switch (match_token(value, nfs_secflavor_tokens, args)) {
812 case Opt_sec_none:
813 mnt->auth_flavors[0] = RPC_AUTH_NULL;
814 break;
815 case Opt_sec_sys:
816 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
817 break;
818 case Opt_sec_krb5:
819 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
820 break;
821 case Opt_sec_krb5i:
822 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
823 break;
824 case Opt_sec_krb5p:
825 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
826 break;
827 case Opt_sec_lkey:
828 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
829 break;
830 case Opt_sec_lkeyi:
831 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
832 break;
833 case Opt_sec_lkeyp:
834 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
835 break;
836 case Opt_sec_spkm:
837 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
838 break;
839 case Opt_sec_spkmi:
840 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
841 break;
842 case Opt_sec_spkmp:
843 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
844 break;
845 default:
846 return 0;
847 }
848
849 mnt->auth_flavor_len = 1;
850 return 1;
851 }
852
853 /*
854 * Error-check and convert a string of mount options from user space into
855 * a data structure. The whole mount string is processed; bad options are
856 * skipped as they are encountered. If there were no errors, return 1;
857 * otherwise return 0 (zero).
858 */
859 static int nfs_parse_mount_options(char *raw,
860 struct nfs_parsed_mount_data *mnt)
861 {
862 char *p, *string, *secdata;
863 int rc, sloppy = 0, invalid_option = 0;
864
865 if (!raw) {
866 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
867 return 1;
868 }
869 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
870
871 secdata = alloc_secdata();
872 if (!secdata)
873 goto out_nomem;
874
875 rc = security_sb_copy_data(raw, secdata);
876 if (rc)
877 goto out_security_failure;
878
879 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
880 if (rc)
881 goto out_security_failure;
882
883 free_secdata(secdata);
884
885 while ((p = strsep(&raw, ",")) != NULL) {
886 substring_t args[MAX_OPT_ARGS];
887 unsigned long option;
888 int token;
889
890 if (!*p)
891 continue;
892
893 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
894
895 token = match_token(p, nfs_mount_option_tokens, args);
896 switch (token) {
897
898 /*
899 * boolean options: foo/nofoo
900 */
901 case Opt_soft:
902 mnt->flags |= NFS_MOUNT_SOFT;
903 break;
904 case Opt_hard:
905 mnt->flags &= ~NFS_MOUNT_SOFT;
906 break;
907 case Opt_posix:
908 mnt->flags |= NFS_MOUNT_POSIX;
909 break;
910 case Opt_noposix:
911 mnt->flags &= ~NFS_MOUNT_POSIX;
912 break;
913 case Opt_cto:
914 mnt->flags &= ~NFS_MOUNT_NOCTO;
915 break;
916 case Opt_nocto:
917 mnt->flags |= NFS_MOUNT_NOCTO;
918 break;
919 case Opt_ac:
920 mnt->flags &= ~NFS_MOUNT_NOAC;
921 break;
922 case Opt_noac:
923 mnt->flags |= NFS_MOUNT_NOAC;
924 break;
925 case Opt_lock:
926 mnt->flags &= ~NFS_MOUNT_NONLM;
927 break;
928 case Opt_nolock:
929 mnt->flags |= NFS_MOUNT_NONLM;
930 break;
931 case Opt_v2:
932 mnt->flags &= ~NFS_MOUNT_VER3;
933 break;
934 case Opt_v3:
935 mnt->flags |= NFS_MOUNT_VER3;
936 break;
937 case Opt_udp:
938 mnt->flags &= ~NFS_MOUNT_TCP;
939 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
940 break;
941 case Opt_tcp:
942 mnt->flags |= NFS_MOUNT_TCP;
943 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
944 break;
945 case Opt_rdma:
946 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
947 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
948 xprt_load_transport(p);
949 break;
950 case Opt_acl:
951 mnt->flags &= ~NFS_MOUNT_NOACL;
952 break;
953 case Opt_noacl:
954 mnt->flags |= NFS_MOUNT_NOACL;
955 break;
956 case Opt_rdirplus:
957 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
958 break;
959 case Opt_nordirplus:
960 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
961 break;
962 case Opt_sharecache:
963 mnt->flags &= ~NFS_MOUNT_UNSHARED;
964 break;
965 case Opt_nosharecache:
966 mnt->flags |= NFS_MOUNT_UNSHARED;
967 break;
968 case Opt_resvport:
969 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
970 break;
971 case Opt_noresvport:
972 mnt->flags |= NFS_MOUNT_NORESVPORT;
973 break;
974 case Opt_fscache:
975 mnt->options |= NFS_OPTION_FSCACHE;
976 kfree(mnt->fscache_uniq);
977 mnt->fscache_uniq = NULL;
978 break;
979 case Opt_nofscache:
980 mnt->options &= ~NFS_OPTION_FSCACHE;
981 kfree(mnt->fscache_uniq);
982 mnt->fscache_uniq = NULL;
983 break;
984 case Opt_fscache_uniq:
985 string = match_strdup(args);
986 if (!string)
987 goto out_nomem;
988 kfree(mnt->fscache_uniq);
989 mnt->fscache_uniq = string;
990 mnt->options |= NFS_OPTION_FSCACHE;
991 break;
992
993 /*
994 * options that take numeric values
995 */
996 case Opt_port:
997 string = match_strdup(args);
998 if (string == NULL)
999 goto out_nomem;
1000 rc = strict_strtoul(string, 10, &option);
1001 kfree(string);
1002 if (rc != 0 || option > USHORT_MAX)
1003 goto out_invalid_value;
1004 mnt->nfs_server.port = option;
1005 break;
1006 case Opt_rsize:
1007 string = match_strdup(args);
1008 if (string == NULL)
1009 goto out_nomem;
1010 rc = strict_strtoul(string, 10, &option);
1011 kfree(string);
1012 if (rc != 0)
1013 goto out_invalid_value;
1014 mnt->rsize = option;
1015 break;
1016 case Opt_wsize:
1017 string = match_strdup(args);
1018 if (string == NULL)
1019 goto out_nomem;
1020 rc = strict_strtoul(string, 10, &option);
1021 kfree(string);
1022 if (rc != 0)
1023 goto out_invalid_value;
1024 mnt->wsize = option;
1025 break;
1026 case Opt_bsize:
1027 string = match_strdup(args);
1028 if (string == NULL)
1029 goto out_nomem;
1030 rc = strict_strtoul(string, 10, &option);
1031 kfree(string);
1032 if (rc != 0)
1033 goto out_invalid_value;
1034 mnt->bsize = option;
1035 break;
1036 case Opt_timeo:
1037 string = match_strdup(args);
1038 if (string == NULL)
1039 goto out_nomem;
1040 rc = strict_strtoul(string, 10, &option);
1041 kfree(string);
1042 if (rc != 0 || option == 0)
1043 goto out_invalid_value;
1044 mnt->timeo = option;
1045 break;
1046 case Opt_retrans:
1047 string = match_strdup(args);
1048 if (string == NULL)
1049 goto out_nomem;
1050 rc = strict_strtoul(string, 10, &option);
1051 kfree(string);
1052 if (rc != 0 || option == 0)
1053 goto out_invalid_value;
1054 mnt->retrans = option;
1055 break;
1056 case Opt_acregmin:
1057 string = match_strdup(args);
1058 if (string == NULL)
1059 goto out_nomem;
1060 rc = strict_strtoul(string, 10, &option);
1061 kfree(string);
1062 if (rc != 0)
1063 goto out_invalid_value;
1064 mnt->acregmin = option;
1065 break;
1066 case Opt_acregmax:
1067 string = match_strdup(args);
1068 if (string == NULL)
1069 goto out_nomem;
1070 rc = strict_strtoul(string, 10, &option);
1071 kfree(string);
1072 if (rc != 0)
1073 goto out_invalid_value;
1074 mnt->acregmax = option;
1075 break;
1076 case Opt_acdirmin:
1077 string = match_strdup(args);
1078 if (string == NULL)
1079 goto out_nomem;
1080 rc = strict_strtoul(string, 10, &option);
1081 kfree(string);
1082 if (rc != 0)
1083 goto out_invalid_value;
1084 mnt->acdirmin = option;
1085 break;
1086 case Opt_acdirmax:
1087 string = match_strdup(args);
1088 if (string == NULL)
1089 goto out_nomem;
1090 rc = strict_strtoul(string, 10, &option);
1091 kfree(string);
1092 if (rc != 0)
1093 goto out_invalid_value;
1094 mnt->acdirmax = option;
1095 break;
1096 case Opt_actimeo:
1097 string = match_strdup(args);
1098 if (string == NULL)
1099 goto out_nomem;
1100 rc = strict_strtoul(string, 10, &option);
1101 kfree(string);
1102 if (rc != 0)
1103 goto out_invalid_value;
1104 mnt->acregmin = mnt->acregmax =
1105 mnt->acdirmin = mnt->acdirmax = option;
1106 break;
1107 case Opt_namelen:
1108 string = match_strdup(args);
1109 if (string == NULL)
1110 goto out_nomem;
1111 rc = strict_strtoul(string, 10, &option);
1112 kfree(string);
1113 if (rc != 0)
1114 goto out_invalid_value;
1115 mnt->namlen = option;
1116 break;
1117 case Opt_mountport:
1118 string = match_strdup(args);
1119 if (string == NULL)
1120 goto out_nomem;
1121 rc = strict_strtoul(string, 10, &option);
1122 kfree(string);
1123 if (rc != 0 || option > USHORT_MAX)
1124 goto out_invalid_value;
1125 mnt->mount_server.port = option;
1126 break;
1127 case Opt_mountvers:
1128 string = match_strdup(args);
1129 if (string == NULL)
1130 goto out_nomem;
1131 rc = strict_strtoul(string, 10, &option);
1132 kfree(string);
1133 if (rc != 0 ||
1134 option < NFS_MNT_VERSION ||
1135 option > NFS_MNT3_VERSION)
1136 goto out_invalid_value;
1137 mnt->mount_server.version = option;
1138 break;
1139 case Opt_nfsvers:
1140 string = match_strdup(args);
1141 if (string == NULL)
1142 goto out_nomem;
1143 rc = strict_strtoul(string, 10, &option);
1144 kfree(string);
1145 if (rc != 0)
1146 goto out_invalid_value;
1147 switch (option) {
1148 case NFS2_VERSION:
1149 mnt->flags &= ~NFS_MOUNT_VER3;
1150 break;
1151 case NFS3_VERSION:
1152 mnt->flags |= NFS_MOUNT_VER3;
1153 break;
1154 default:
1155 goto out_invalid_value;
1156 }
1157 break;
1158 case Opt_minorversion:
1159 string = match_strdup(args);
1160 if (string == NULL)
1161 goto out_nomem;
1162 rc = strict_strtoul(string, 10, &option);
1163 kfree(string);
1164 if (rc != 0)
1165 goto out_invalid_value;
1166 if (option > NFS4_MAX_MINOR_VERSION)
1167 goto out_invalid_value;
1168 mnt->minorversion = option;
1169 break;
1170
1171 /*
1172 * options that take text values
1173 */
1174 case Opt_sec:
1175 string = match_strdup(args);
1176 if (string == NULL)
1177 goto out_nomem;
1178 rc = nfs_parse_security_flavors(string, mnt);
1179 kfree(string);
1180 if (!rc) {
1181 dfprintk(MOUNT, "NFS: unrecognized "
1182 "security flavor\n");
1183 return 0;
1184 }
1185 break;
1186 case Opt_proto:
1187 string = match_strdup(args);
1188 if (string == NULL)
1189 goto out_nomem;
1190 token = match_token(string,
1191 nfs_xprt_protocol_tokens, args);
1192
1193 switch (token) {
1194 case Opt_xprt_udp:
1195 mnt->flags &= ~NFS_MOUNT_TCP;
1196 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1197 kfree(string);
1198 break;
1199 case Opt_xprt_tcp:
1200 mnt->flags |= NFS_MOUNT_TCP;
1201 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1202 kfree(string);
1203 break;
1204 case Opt_xprt_rdma:
1205 /* vector side protocols to TCP */
1206 mnt->flags |= NFS_MOUNT_TCP;
1207 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1208 xprt_load_transport(string);
1209 kfree(string);
1210 break;
1211 default:
1212 dfprintk(MOUNT, "NFS: unrecognized "
1213 "transport protocol\n");
1214 return 0;
1215 }
1216 break;
1217 case Opt_mountproto:
1218 string = match_strdup(args);
1219 if (string == NULL)
1220 goto out_nomem;
1221 token = match_token(string,
1222 nfs_xprt_protocol_tokens, args);
1223 kfree(string);
1224
1225 switch (token) {
1226 case Opt_xprt_udp:
1227 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1228 break;
1229 case Opt_xprt_tcp:
1230 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1231 break;
1232 case Opt_xprt_rdma: /* not used for side protocols */
1233 default:
1234 dfprintk(MOUNT, "NFS: unrecognized "
1235 "transport protocol\n");
1236 return 0;
1237 }
1238 break;
1239 case Opt_addr:
1240 string = match_strdup(args);
1241 if (string == NULL)
1242 goto out_nomem;
1243 mnt->nfs_server.addrlen =
1244 rpc_pton(string, strlen(string),
1245 (struct sockaddr *)
1246 &mnt->nfs_server.address,
1247 sizeof(mnt->nfs_server.address));
1248 kfree(string);
1249 if (mnt->nfs_server.addrlen == 0)
1250 goto out_invalid_address;
1251 break;
1252 case Opt_clientaddr:
1253 string = match_strdup(args);
1254 if (string == NULL)
1255 goto out_nomem;
1256 kfree(mnt->client_address);
1257 mnt->client_address = string;
1258 break;
1259 case Opt_mounthost:
1260 string = match_strdup(args);
1261 if (string == NULL)
1262 goto out_nomem;
1263 kfree(mnt->mount_server.hostname);
1264 mnt->mount_server.hostname = string;
1265 break;
1266 case Opt_mountaddr:
1267 string = match_strdup(args);
1268 if (string == NULL)
1269 goto out_nomem;
1270 mnt->mount_server.addrlen =
1271 rpc_pton(string, strlen(string),
1272 (struct sockaddr *)
1273 &mnt->mount_server.address,
1274 sizeof(mnt->mount_server.address));
1275 kfree(string);
1276 if (mnt->mount_server.addrlen == 0)
1277 goto out_invalid_address;
1278 break;
1279 case Opt_lookupcache:
1280 string = match_strdup(args);
1281 if (string == NULL)
1282 goto out_nomem;
1283 token = match_token(string,
1284 nfs_lookupcache_tokens, args);
1285 kfree(string);
1286 switch (token) {
1287 case Opt_lookupcache_all:
1288 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1289 break;
1290 case Opt_lookupcache_positive:
1291 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1292 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1293 break;
1294 case Opt_lookupcache_none:
1295 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1296 break;
1297 default:
1298 dfprintk(MOUNT, "NFS: invalid "
1299 "lookupcache argument\n");
1300 return 0;
1301 };
1302 break;
1303
1304 /*
1305 * Special options
1306 */
1307 case Opt_sloppy:
1308 sloppy = 1;
1309 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1310 break;
1311 case Opt_userspace:
1312 case Opt_deprecated:
1313 dfprintk(MOUNT, "NFS: ignoring mount option "
1314 "'%s'\n", p);
1315 break;
1316
1317 default:
1318 invalid_option = 1;
1319 dfprintk(MOUNT, "NFS: unrecognized mount option "
1320 "'%s'\n", p);
1321 }
1322 }
1323
1324 if (!sloppy && invalid_option)
1325 return 0;
1326
1327 return 1;
1328
1329 out_invalid_address:
1330 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1331 return 0;
1332 out_invalid_value:
1333 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1334 return 0;
1335 out_nomem:
1336 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1337 return 0;
1338 out_security_failure:
1339 free_secdata(secdata);
1340 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1341 return 0;
1342 }
1343
1344 /*
1345 * Match the requested auth flavors with the list returned by
1346 * the server. Returns zero and sets the mount's authentication
1347 * flavor on success; returns -EACCES if server does not support
1348 * the requested flavor.
1349 */
1350 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1351 struct nfs_mount_request *request)
1352 {
1353 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1354
1355 /*
1356 * Certain releases of Linux's mountd return an empty
1357 * flavor list. To prevent behavioral regression with
1358 * these servers (ie. rejecting mounts that used to
1359 * succeed), revert to pre-2.6.32 behavior (no checking)
1360 * if the returned flavor list is empty.
1361 */
1362 if (server_authlist_len == 0)
1363 return 0;
1364
1365 /*
1366 * We avoid sophisticated negotiating here, as there are
1367 * plenty of cases where we can get it wrong, providing
1368 * either too little or too much security.
1369 *
1370 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1371 * flavor listed first. However, some servers list
1372 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1373 * preferred default, in args->auth_flavors[0] if user
1374 * didn't specify sec= mount option.
1375 */
1376 for (i = 0; i < args->auth_flavor_len; i++)
1377 for (j = 0; j < server_authlist_len; j++)
1378 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1379 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1380 request->auth_flavs[j]);
1381 args->auth_flavors[0] = request->auth_flavs[j];
1382 return 0;
1383 }
1384
1385 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1386 nfs_umount(request);
1387 return -EACCES;
1388 }
1389
1390 /*
1391 * Use the remote server's MOUNT service to request the NFS file handle
1392 * corresponding to the provided path.
1393 */
1394 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1395 struct nfs_fh *root_fh)
1396 {
1397 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1398 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1399 struct nfs_mount_request request = {
1400 .sap = (struct sockaddr *)
1401 &args->mount_server.address,
1402 .dirpath = args->nfs_server.export_path,
1403 .protocol = args->mount_server.protocol,
1404 .fh = root_fh,
1405 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1406 .auth_flav_len = &server_authlist_len,
1407 .auth_flavs = server_authlist,
1408 };
1409 int status;
1410
1411 if (args->mount_server.version == 0) {
1412 if (args->flags & NFS_MOUNT_VER3)
1413 args->mount_server.version = NFS_MNT3_VERSION;
1414 else
1415 args->mount_server.version = NFS_MNT_VERSION;
1416 }
1417 request.version = args->mount_server.version;
1418
1419 if (args->mount_server.hostname)
1420 request.hostname = args->mount_server.hostname;
1421 else
1422 request.hostname = args->nfs_server.hostname;
1423
1424 /*
1425 * Construct the mount server's address.
1426 */
1427 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1428 memcpy(request.sap, &args->nfs_server.address,
1429 args->nfs_server.addrlen);
1430 args->mount_server.addrlen = args->nfs_server.addrlen;
1431 }
1432 request.salen = args->mount_server.addrlen;
1433 nfs_set_default_port(request.sap, args->mount_server.port, 0);
1434
1435 /*
1436 * Now ask the mount server to map our export path
1437 * to a file handle.
1438 */
1439 status = nfs_mount(&request);
1440 if (status != 0) {
1441 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1442 request.hostname, status);
1443 return status;
1444 }
1445
1446 /*
1447 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1448 */
1449 if (args->mount_server.version != NFS_MNT3_VERSION)
1450 return 0;
1451 return nfs_walk_authlist(args, &request);
1452 }
1453
1454 static int nfs_parse_simple_hostname(const char *dev_name,
1455 char **hostname, size_t maxnamlen,
1456 char **export_path, size_t maxpathlen)
1457 {
1458 size_t len;
1459 char *colon, *comma;
1460
1461 colon = strchr(dev_name, ':');
1462 if (colon == NULL)
1463 goto out_bad_devname;
1464
1465 len = colon - dev_name;
1466 if (len > maxnamlen)
1467 goto out_hostname;
1468
1469 /* N.B. caller will free nfs_server.hostname in all cases */
1470 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1471 if (!*hostname)
1472 goto out_nomem;
1473
1474 /* kill possible hostname list: not supported */
1475 comma = strchr(*hostname, ',');
1476 if (comma != NULL) {
1477 if (comma == *hostname)
1478 goto out_bad_devname;
1479 *comma = '\0';
1480 }
1481
1482 colon++;
1483 len = strlen(colon);
1484 if (len > maxpathlen)
1485 goto out_path;
1486 *export_path = kstrndup(colon, len, GFP_KERNEL);
1487 if (!*export_path)
1488 goto out_nomem;
1489
1490 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1491 return 0;
1492
1493 out_bad_devname:
1494 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1495 return -EINVAL;
1496
1497 out_nomem:
1498 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1499 return -ENOMEM;
1500
1501 out_hostname:
1502 dfprintk(MOUNT, "NFS: server hostname too long\n");
1503 return -ENAMETOOLONG;
1504
1505 out_path:
1506 dfprintk(MOUNT, "NFS: export pathname too long\n");
1507 return -ENAMETOOLONG;
1508 }
1509
1510 /*
1511 * Hostname has square brackets around it because it contains one or
1512 * more colons. We look for the first closing square bracket, and a
1513 * colon must follow it.
1514 */
1515 static int nfs_parse_protected_hostname(const char *dev_name,
1516 char **hostname, size_t maxnamlen,
1517 char **export_path, size_t maxpathlen)
1518 {
1519 size_t len;
1520 char *start, *end;
1521
1522 start = (char *)(dev_name + 1);
1523
1524 end = strchr(start, ']');
1525 if (end == NULL)
1526 goto out_bad_devname;
1527 if (*(end + 1) != ':')
1528 goto out_bad_devname;
1529
1530 len = end - start;
1531 if (len > maxnamlen)
1532 goto out_hostname;
1533
1534 /* N.B. caller will free nfs_server.hostname in all cases */
1535 *hostname = kstrndup(start, len, GFP_KERNEL);
1536 if (*hostname == NULL)
1537 goto out_nomem;
1538
1539 end += 2;
1540 len = strlen(end);
1541 if (len > maxpathlen)
1542 goto out_path;
1543 *export_path = kstrndup(end, len, GFP_KERNEL);
1544 if (!*export_path)
1545 goto out_nomem;
1546
1547 return 0;
1548
1549 out_bad_devname:
1550 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1551 return -EINVAL;
1552
1553 out_nomem:
1554 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1555 return -ENOMEM;
1556
1557 out_hostname:
1558 dfprintk(MOUNT, "NFS: server hostname too long\n");
1559 return -ENAMETOOLONG;
1560
1561 out_path:
1562 dfprintk(MOUNT, "NFS: export pathname too long\n");
1563 return -ENAMETOOLONG;
1564 }
1565
1566 /*
1567 * Split "dev_name" into "hostname:export_path".
1568 *
1569 * The leftmost colon demarks the split between the server's hostname
1570 * and the export path. If the hostname starts with a left square
1571 * bracket, then it may contain colons.
1572 *
1573 * Note: caller frees hostname and export path, even on error.
1574 */
1575 static int nfs_parse_devname(const char *dev_name,
1576 char **hostname, size_t maxnamlen,
1577 char **export_path, size_t maxpathlen)
1578 {
1579 if (*dev_name == '[')
1580 return nfs_parse_protected_hostname(dev_name,
1581 hostname, maxnamlen,
1582 export_path, maxpathlen);
1583
1584 return nfs_parse_simple_hostname(dev_name,
1585 hostname, maxnamlen,
1586 export_path, maxpathlen);
1587 }
1588
1589 /*
1590 * Validate the NFS2/NFS3 mount data
1591 * - fills in the mount root filehandle
1592 *
1593 * For option strings, user space handles the following behaviors:
1594 *
1595 * + DNS: mapping server host name to IP address ("addr=" option)
1596 *
1597 * + failure mode: how to behave if a mount request can't be handled
1598 * immediately ("fg/bg" option)
1599 *
1600 * + retry: how often to retry a mount request ("retry=" option)
1601 *
1602 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1603 * mountproto=tcp after mountproto=udp, and so on
1604 */
1605 static int nfs_validate_mount_data(void *options,
1606 struct nfs_parsed_mount_data *args,
1607 struct nfs_fh *mntfh,
1608 const char *dev_name)
1609 {
1610 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1611 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1612
1613 if (data == NULL)
1614 goto out_no_data;
1615
1616 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1617 args->rsize = NFS_MAX_FILE_IO_SIZE;
1618 args->wsize = NFS_MAX_FILE_IO_SIZE;
1619 args->acregmin = NFS_DEF_ACREGMIN;
1620 args->acregmax = NFS_DEF_ACREGMAX;
1621 args->acdirmin = NFS_DEF_ACDIRMIN;
1622 args->acdirmax = NFS_DEF_ACDIRMAX;
1623 args->mount_server.port = NFS_UNSPEC_PORT;
1624 args->nfs_server.port = NFS_UNSPEC_PORT;
1625 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1626 args->auth_flavors[0] = RPC_AUTH_UNIX;
1627 args->auth_flavor_len = 1;
1628
1629 switch (data->version) {
1630 case 1:
1631 data->namlen = 0;
1632 case 2:
1633 data->bsize = 0;
1634 case 3:
1635 if (data->flags & NFS_MOUNT_VER3)
1636 goto out_no_v3;
1637 data->root.size = NFS2_FHSIZE;
1638 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1639 case 4:
1640 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1641 goto out_no_sec;
1642 case 5:
1643 memset(data->context, 0, sizeof(data->context));
1644 case 6:
1645 if (data->flags & NFS_MOUNT_VER3) {
1646 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1647 goto out_invalid_fh;
1648 mntfh->size = data->root.size;
1649 } else
1650 mntfh->size = NFS2_FHSIZE;
1651
1652
1653 memcpy(mntfh->data, data->root.data, mntfh->size);
1654 if (mntfh->size < sizeof(mntfh->data))
1655 memset(mntfh->data + mntfh->size, 0,
1656 sizeof(mntfh->data) - mntfh->size);
1657
1658 /*
1659 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1660 * can deal with.
1661 */
1662 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1663 args->rsize = data->rsize;
1664 args->wsize = data->wsize;
1665 args->timeo = data->timeo;
1666 args->retrans = data->retrans;
1667 args->acregmin = data->acregmin;
1668 args->acregmax = data->acregmax;
1669 args->acdirmin = data->acdirmin;
1670 args->acdirmax = data->acdirmax;
1671
1672 memcpy(sap, &data->addr, sizeof(data->addr));
1673 args->nfs_server.addrlen = sizeof(data->addr);
1674 if (!nfs_verify_server_address(sap))
1675 goto out_no_address;
1676
1677 if (!(data->flags & NFS_MOUNT_TCP))
1678 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1679 /* N.B. caller will free nfs_server.hostname in all cases */
1680 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1681 args->namlen = data->namlen;
1682 args->bsize = data->bsize;
1683
1684 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1685 args->auth_flavors[0] = data->pseudoflavor;
1686 if (!args->nfs_server.hostname)
1687 goto out_nomem;
1688
1689 /*
1690 * The legacy version 6 binary mount data from userspace has a
1691 * field used only to transport selinux information into the
1692 * the kernel. To continue to support that functionality we
1693 * have a touch of selinux knowledge here in the NFS code. The
1694 * userspace code converted context=blah to just blah so we are
1695 * converting back to the full string selinux understands.
1696 */
1697 if (data->context[0]){
1698 #ifdef CONFIG_SECURITY_SELINUX
1699 int rc;
1700 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1701 if (!opts_str)
1702 return -ENOMEM;
1703 strcpy(opts_str, "context=");
1704 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1705 strcat(opts_str, &data->context[0]);
1706 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1707 kfree(opts_str);
1708 if (rc)
1709 return rc;
1710 #else
1711 return -EINVAL;
1712 #endif
1713 }
1714
1715 break;
1716 default: {
1717 int status;
1718
1719 if (nfs_parse_mount_options((char *)options, args) == 0)
1720 return -EINVAL;
1721
1722 if (!nfs_verify_server_address(sap))
1723 goto out_no_address;
1724
1725 nfs_set_default_port(sap, args->nfs_server.port, 0);
1726
1727 nfs_set_mount_transport_protocol(args);
1728
1729 status = nfs_parse_devname(dev_name,
1730 &args->nfs_server.hostname,
1731 PAGE_SIZE,
1732 &args->nfs_server.export_path,
1733 NFS_MAXPATHLEN);
1734 if (!status)
1735 status = nfs_try_mount(args, mntfh);
1736
1737 kfree(args->nfs_server.export_path);
1738 args->nfs_server.export_path = NULL;
1739
1740 if (status)
1741 return status;
1742
1743 break;
1744 }
1745 }
1746
1747 #ifndef CONFIG_NFS_V3
1748 if (args->flags & NFS_MOUNT_VER3)
1749 goto out_v3_not_compiled;
1750 #endif /* !CONFIG_NFS_V3 */
1751
1752 return 0;
1753
1754 out_no_data:
1755 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1756 return -EINVAL;
1757
1758 out_no_v3:
1759 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1760 data->version);
1761 return -EINVAL;
1762
1763 out_no_sec:
1764 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1765 return -EINVAL;
1766
1767 #ifndef CONFIG_NFS_V3
1768 out_v3_not_compiled:
1769 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1770 return -EPROTONOSUPPORT;
1771 #endif /* !CONFIG_NFS_V3 */
1772
1773 out_nomem:
1774 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1775 return -ENOMEM;
1776
1777 out_no_address:
1778 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1779 return -EINVAL;
1780
1781 out_invalid_fh:
1782 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1783 return -EINVAL;
1784 }
1785
1786 static int
1787 nfs_compare_remount_data(struct nfs_server *nfss,
1788 struct nfs_parsed_mount_data *data)
1789 {
1790 if (data->flags != nfss->flags ||
1791 data->rsize != nfss->rsize ||
1792 data->wsize != nfss->wsize ||
1793 data->retrans != nfss->client->cl_timeout->to_retries ||
1794 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1795 data->acregmin != nfss->acregmin / HZ ||
1796 data->acregmax != nfss->acregmax / HZ ||
1797 data->acdirmin != nfss->acdirmin / HZ ||
1798 data->acdirmax != nfss->acdirmax / HZ ||
1799 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1800 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1801 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1802 data->nfs_server.addrlen) != 0)
1803 return -EINVAL;
1804
1805 return 0;
1806 }
1807
1808 static int
1809 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1810 {
1811 int error;
1812 struct nfs_server *nfss = sb->s_fs_info;
1813 struct nfs_parsed_mount_data *data;
1814 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1815 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1816 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1817
1818 /*
1819 * Userspace mount programs that send binary options generally send
1820 * them populated with default values. We have no way to know which
1821 * ones were explicitly specified. Fall back to legacy behavior and
1822 * just return success.
1823 */
1824 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1825 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1826 options->version <= 6))))
1827 return 0;
1828
1829 data = kzalloc(sizeof(*data), GFP_KERNEL);
1830 if (data == NULL)
1831 return -ENOMEM;
1832
1833 lock_kernel();
1834 /* fill out struct with values from existing mount */
1835 data->flags = nfss->flags;
1836 data->rsize = nfss->rsize;
1837 data->wsize = nfss->wsize;
1838 data->retrans = nfss->client->cl_timeout->to_retries;
1839 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1840 data->acregmin = nfss->acregmin / HZ;
1841 data->acregmax = nfss->acregmax / HZ;
1842 data->acdirmin = nfss->acdirmin / HZ;
1843 data->acdirmax = nfss->acdirmax / HZ;
1844 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1845 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1846 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1847 data->nfs_server.addrlen);
1848
1849 /* overwrite those values with any that were specified */
1850 error = nfs_parse_mount_options((char *)options, data);
1851 if (error < 0)
1852 goto out;
1853
1854 /* compare new mount options with old ones */
1855 error = nfs_compare_remount_data(nfss, data);
1856 out:
1857 kfree(data);
1858 unlock_kernel();
1859 return error;
1860 }
1861
1862 /*
1863 * Initialise the common bits of the superblock
1864 */
1865 static inline void nfs_initialise_sb(struct super_block *sb)
1866 {
1867 struct nfs_server *server = NFS_SB(sb);
1868
1869 sb->s_magic = NFS_SUPER_MAGIC;
1870
1871 /* We probably want something more informative here */
1872 snprintf(sb->s_id, sizeof(sb->s_id),
1873 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1874
1875 if (sb->s_blocksize == 0)
1876 sb->s_blocksize = nfs_block_bits(server->wsize,
1877 &sb->s_blocksize_bits);
1878
1879 if (server->flags & NFS_MOUNT_NOAC)
1880 sb->s_flags |= MS_SYNCHRONOUS;
1881
1882 nfs_super_set_maxbytes(sb, server->maxfilesize);
1883 }
1884
1885 /*
1886 * Finish setting up an NFS2/3 superblock
1887 */
1888 static void nfs_fill_super(struct super_block *sb,
1889 struct nfs_parsed_mount_data *data)
1890 {
1891 struct nfs_server *server = NFS_SB(sb);
1892
1893 sb->s_blocksize_bits = 0;
1894 sb->s_blocksize = 0;
1895 if (data->bsize)
1896 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1897
1898 if (server->flags & NFS_MOUNT_VER3) {
1899 /* The VFS shouldn't apply the umask to mode bits. We will do
1900 * so ourselves when necessary.
1901 */
1902 sb->s_flags |= MS_POSIXACL;
1903 sb->s_time_gran = 1;
1904 }
1905
1906 sb->s_op = &nfs_sops;
1907 nfs_initialise_sb(sb);
1908 }
1909
1910 /*
1911 * Finish setting up a cloned NFS2/3 superblock
1912 */
1913 static void nfs_clone_super(struct super_block *sb,
1914 const struct super_block *old_sb)
1915 {
1916 struct nfs_server *server = NFS_SB(sb);
1917
1918 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1919 sb->s_blocksize = old_sb->s_blocksize;
1920 sb->s_maxbytes = old_sb->s_maxbytes;
1921
1922 if (server->flags & NFS_MOUNT_VER3) {
1923 /* The VFS shouldn't apply the umask to mode bits. We will do
1924 * so ourselves when necessary.
1925 */
1926 sb->s_flags |= MS_POSIXACL;
1927 sb->s_time_gran = 1;
1928 }
1929
1930 sb->s_op = old_sb->s_op;
1931 nfs_initialise_sb(sb);
1932 }
1933
1934 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1935 {
1936 const struct nfs_server *a = s->s_fs_info;
1937 const struct rpc_clnt *clnt_a = a->client;
1938 const struct rpc_clnt *clnt_b = b->client;
1939
1940 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1941 goto Ebusy;
1942 if (a->nfs_client != b->nfs_client)
1943 goto Ebusy;
1944 if (a->flags != b->flags)
1945 goto Ebusy;
1946 if (a->wsize != b->wsize)
1947 goto Ebusy;
1948 if (a->rsize != b->rsize)
1949 goto Ebusy;
1950 if (a->acregmin != b->acregmin)
1951 goto Ebusy;
1952 if (a->acregmax != b->acregmax)
1953 goto Ebusy;
1954 if (a->acdirmin != b->acdirmin)
1955 goto Ebusy;
1956 if (a->acdirmax != b->acdirmax)
1957 goto Ebusy;
1958 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1959 goto Ebusy;
1960 return 1;
1961 Ebusy:
1962 return 0;
1963 }
1964
1965 struct nfs_sb_mountdata {
1966 struct nfs_server *server;
1967 int mntflags;
1968 };
1969
1970 static int nfs_set_super(struct super_block *s, void *data)
1971 {
1972 struct nfs_sb_mountdata *sb_mntdata = data;
1973 struct nfs_server *server = sb_mntdata->server;
1974 int ret;
1975
1976 s->s_flags = sb_mntdata->mntflags;
1977 s->s_fs_info = server;
1978 ret = set_anon_super(s, server);
1979 if (ret == 0)
1980 server->s_dev = s->s_dev;
1981 return ret;
1982 }
1983
1984 static int nfs_compare_super_address(struct nfs_server *server1,
1985 struct nfs_server *server2)
1986 {
1987 struct sockaddr *sap1, *sap2;
1988
1989 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1990 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1991
1992 if (sap1->sa_family != sap2->sa_family)
1993 return 0;
1994
1995 switch (sap1->sa_family) {
1996 case AF_INET: {
1997 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1998 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1999 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2000 return 0;
2001 if (sin1->sin_port != sin2->sin_port)
2002 return 0;
2003 break;
2004 }
2005 case AF_INET6: {
2006 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2007 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2008 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2009 return 0;
2010 if (sin1->sin6_port != sin2->sin6_port)
2011 return 0;
2012 break;
2013 }
2014 default:
2015 return 0;
2016 }
2017
2018 return 1;
2019 }
2020
2021 static int nfs_compare_super(struct super_block *sb, void *data)
2022 {
2023 struct nfs_sb_mountdata *sb_mntdata = data;
2024 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2025 int mntflags = sb_mntdata->mntflags;
2026
2027 if (!nfs_compare_super_address(old, server))
2028 return 0;
2029 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2030 if (old->flags & NFS_MOUNT_UNSHARED)
2031 return 0;
2032 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2033 return 0;
2034 return nfs_compare_mount_options(sb, server, mntflags);
2035 }
2036
2037 static int nfs_bdi_register(struct nfs_server *server)
2038 {
2039 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2040 }
2041
2042 static int nfs_get_sb(struct file_system_type *fs_type,
2043 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2044 {
2045 struct nfs_server *server = NULL;
2046 struct super_block *s;
2047 struct nfs_parsed_mount_data *data;
2048 struct nfs_fh *mntfh;
2049 struct dentry *mntroot;
2050 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2051 struct nfs_sb_mountdata sb_mntdata = {
2052 .mntflags = flags,
2053 };
2054 int error = -ENOMEM;
2055
2056 data = kzalloc(sizeof(*data), GFP_KERNEL);
2057 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2058 if (data == NULL || mntfh == NULL)
2059 goto out_free_fh;
2060
2061 security_init_mnt_opts(&data->lsm_opts);
2062
2063 /* Validate the mount data */
2064 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2065 if (error < 0)
2066 goto out;
2067
2068 /* Get a volume representation */
2069 server = nfs_create_server(data, mntfh);
2070 if (IS_ERR(server)) {
2071 error = PTR_ERR(server);
2072 goto out;
2073 }
2074 sb_mntdata.server = server;
2075
2076 if (server->flags & NFS_MOUNT_UNSHARED)
2077 compare_super = NULL;
2078
2079 /* Get a superblock - note that we may end up sharing one that already exists */
2080 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2081 if (IS_ERR(s)) {
2082 error = PTR_ERR(s);
2083 goto out_err_nosb;
2084 }
2085
2086 if (s->s_fs_info != server) {
2087 nfs_free_server(server);
2088 server = NULL;
2089 } else {
2090 error = nfs_bdi_register(server);
2091 if (error)
2092 goto error_splat_super;
2093 }
2094
2095 if (!s->s_root) {
2096 /* initial superblock/root creation */
2097 nfs_fill_super(s, data);
2098 nfs_fscache_get_super_cookie(s, data);
2099 }
2100
2101 mntroot = nfs_get_root(s, mntfh);
2102 if (IS_ERR(mntroot)) {
2103 error = PTR_ERR(mntroot);
2104 goto error_splat_super;
2105 }
2106
2107 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2108 if (error)
2109 goto error_splat_root;
2110
2111 s->s_flags |= MS_ACTIVE;
2112 mnt->mnt_sb = s;
2113 mnt->mnt_root = mntroot;
2114 error = 0;
2115
2116 out:
2117 kfree(data->nfs_server.hostname);
2118 kfree(data->mount_server.hostname);
2119 kfree(data->fscache_uniq);
2120 security_free_mnt_opts(&data->lsm_opts);
2121 out_free_fh:
2122 kfree(mntfh);
2123 kfree(data);
2124 return error;
2125
2126 out_err_nosb:
2127 nfs_free_server(server);
2128 goto out;
2129
2130 error_splat_root:
2131 dput(mntroot);
2132 error_splat_super:
2133 deactivate_locked_super(s);
2134 goto out;
2135 }
2136
2137 /*
2138 * Destroy an NFS2/3 superblock
2139 */
2140 static void nfs_kill_super(struct super_block *s)
2141 {
2142 struct nfs_server *server = NFS_SB(s);
2143
2144 bdi_unregister(&server->backing_dev_info);
2145 kill_anon_super(s);
2146 nfs_fscache_release_super_cookie(s);
2147 nfs_free_server(server);
2148 }
2149
2150 /*
2151 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2152 */
2153 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2154 const char *dev_name, void *raw_data,
2155 struct vfsmount *mnt)
2156 {
2157 struct nfs_clone_mount *data = raw_data;
2158 struct super_block *s;
2159 struct nfs_server *server;
2160 struct dentry *mntroot;
2161 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2162 struct nfs_sb_mountdata sb_mntdata = {
2163 .mntflags = flags,
2164 };
2165 int error;
2166
2167 dprintk("--> nfs_xdev_get_sb()\n");
2168
2169 /* create a new volume representation */
2170 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2171 if (IS_ERR(server)) {
2172 error = PTR_ERR(server);
2173 goto out_err_noserver;
2174 }
2175 sb_mntdata.server = server;
2176
2177 if (server->flags & NFS_MOUNT_UNSHARED)
2178 compare_super = NULL;
2179
2180 /* Get a superblock - note that we may end up sharing one that already exists */
2181 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2182 if (IS_ERR(s)) {
2183 error = PTR_ERR(s);
2184 goto out_err_nosb;
2185 }
2186
2187 if (s->s_fs_info != server) {
2188 nfs_free_server(server);
2189 server = NULL;
2190 } else {
2191 error = nfs_bdi_register(server);
2192 if (error)
2193 goto error_splat_super;
2194 }
2195
2196 if (!s->s_root) {
2197 /* initial superblock/root creation */
2198 nfs_clone_super(s, data->sb);
2199 }
2200
2201 mntroot = nfs_get_root(s, data->fh);
2202 if (IS_ERR(mntroot)) {
2203 error = PTR_ERR(mntroot);
2204 goto error_splat_super;
2205 }
2206 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2207 dput(mntroot);
2208 error = -ESTALE;
2209 goto error_splat_super;
2210 }
2211
2212 s->s_flags |= MS_ACTIVE;
2213 mnt->mnt_sb = s;
2214 mnt->mnt_root = mntroot;
2215
2216 /* clone any lsm security options from the parent to the new sb */
2217 security_sb_clone_mnt_opts(data->sb, s);
2218
2219 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2220 return 0;
2221
2222 out_err_nosb:
2223 nfs_free_server(server);
2224 out_err_noserver:
2225 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2226 return error;
2227
2228 error_splat_super:
2229 deactivate_locked_super(s);
2230 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2231 return error;
2232 }
2233
2234 #ifdef CONFIG_NFS_V4
2235
2236 /*
2237 * Finish setting up a cloned NFS4 superblock
2238 */
2239 static void nfs4_clone_super(struct super_block *sb,
2240 const struct super_block *old_sb)
2241 {
2242 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2243 sb->s_blocksize = old_sb->s_blocksize;
2244 sb->s_maxbytes = old_sb->s_maxbytes;
2245 sb->s_time_gran = 1;
2246 sb->s_op = old_sb->s_op;
2247 nfs_initialise_sb(sb);
2248 }
2249
2250 /*
2251 * Set up an NFS4 superblock
2252 */
2253 static void nfs4_fill_super(struct super_block *sb)
2254 {
2255 sb->s_time_gran = 1;
2256 sb->s_op = &nfs4_sops;
2257 nfs_initialise_sb(sb);
2258 }
2259
2260 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2261 {
2262 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2263 }
2264
2265 /*
2266 * Validate NFSv4 mount options
2267 */
2268 static int nfs4_validate_mount_data(void *options,
2269 struct nfs_parsed_mount_data *args,
2270 const char *dev_name)
2271 {
2272 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2273 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2274 char *c;
2275
2276 if (data == NULL)
2277 goto out_no_data;
2278
2279 args->rsize = NFS_MAX_FILE_IO_SIZE;
2280 args->wsize = NFS_MAX_FILE_IO_SIZE;
2281 args->acregmin = NFS_DEF_ACREGMIN;
2282 args->acregmax = NFS_DEF_ACREGMAX;
2283 args->acdirmin = NFS_DEF_ACDIRMIN;
2284 args->acdirmax = NFS_DEF_ACDIRMAX;
2285 args->nfs_server.port = NFS_UNSPEC_PORT;
2286 args->auth_flavors[0] = RPC_AUTH_UNIX;
2287 args->auth_flavor_len = 1;
2288 args->minorversion = 0;
2289
2290 switch (data->version) {
2291 case 1:
2292 if (data->host_addrlen > sizeof(args->nfs_server.address))
2293 goto out_no_address;
2294 if (data->host_addrlen == 0)
2295 goto out_no_address;
2296 args->nfs_server.addrlen = data->host_addrlen;
2297 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2298 return -EFAULT;
2299 if (!nfs_verify_server_address(sap))
2300 goto out_no_address;
2301
2302 if (data->auth_flavourlen) {
2303 if (data->auth_flavourlen > 1)
2304 goto out_inval_auth;
2305 if (copy_from_user(&args->auth_flavors[0],
2306 data->auth_flavours,
2307 sizeof(args->auth_flavors[0])))
2308 return -EFAULT;
2309 }
2310
2311 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2312 if (IS_ERR(c))
2313 return PTR_ERR(c);
2314 args->nfs_server.hostname = c;
2315
2316 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2317 if (IS_ERR(c))
2318 return PTR_ERR(c);
2319 args->nfs_server.export_path = c;
2320 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2321
2322 c = strndup_user(data->client_addr.data, 16);
2323 if (IS_ERR(c))
2324 return PTR_ERR(c);
2325 args->client_address = c;
2326
2327 /*
2328 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2329 * can deal with.
2330 */
2331
2332 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2333 args->rsize = data->rsize;
2334 args->wsize = data->wsize;
2335 args->timeo = data->timeo;
2336 args->retrans = data->retrans;
2337 args->acregmin = data->acregmin;
2338 args->acregmax = data->acregmax;
2339 args->acdirmin = data->acdirmin;
2340 args->acdirmax = data->acdirmax;
2341 args->nfs_server.protocol = data->proto;
2342 nfs_validate_transport_protocol(args);
2343
2344 break;
2345 default: {
2346 int status;
2347
2348 if (nfs_parse_mount_options((char *)options, args) == 0)
2349 return -EINVAL;
2350
2351 if (!nfs_verify_server_address(sap))
2352 return -EINVAL;
2353 nfs_set_default_port(sap, args->nfs_server.port, NFS_PORT);
2354
2355 nfs_validate_transport_protocol(args);
2356
2357 nfs4_validate_mount_flags(args);
2358
2359 if (args->auth_flavor_len > 1)
2360 goto out_inval_auth;
2361
2362 if (args->client_address == NULL)
2363 goto out_no_client_address;
2364
2365 status = nfs_parse_devname(dev_name,
2366 &args->nfs_server.hostname,
2367 NFS4_MAXNAMLEN,
2368 &args->nfs_server.export_path,
2369 NFS4_MAXPATHLEN);
2370 if (status < 0)
2371 return status;
2372
2373 break;
2374 }
2375 }
2376
2377 return 0;
2378
2379 out_no_data:
2380 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2381 return -EINVAL;
2382
2383 out_inval_auth:
2384 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2385 data->auth_flavourlen);
2386 return -EINVAL;
2387
2388 out_no_address:
2389 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2390 return -EINVAL;
2391
2392 out_no_client_address:
2393 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2394 return -EINVAL;
2395 }
2396
2397 /*
2398 * Get the superblock for the NFS4 root partition
2399 */
2400 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2401 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2402 {
2403 struct nfs_parsed_mount_data *data = raw_data;
2404 struct super_block *s;
2405 struct nfs_server *server;
2406 struct nfs_fh *mntfh;
2407 struct dentry *mntroot;
2408 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2409 struct nfs_sb_mountdata sb_mntdata = {
2410 .mntflags = flags,
2411 };
2412 int error = -ENOMEM;
2413
2414 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2415 if (data == NULL || mntfh == NULL)
2416 goto out_free_fh;
2417
2418 security_init_mnt_opts(&data->lsm_opts);
2419
2420 /* Get a volume representation */
2421 server = nfs4_create_server(data, mntfh);
2422 if (IS_ERR(server)) {
2423 error = PTR_ERR(server);
2424 goto out;
2425 }
2426 sb_mntdata.server = server;
2427
2428 if (server->flags & NFS4_MOUNT_UNSHARED)
2429 compare_super = NULL;
2430
2431 /* Get a superblock - note that we may end up sharing one that already exists */
2432 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2433 if (IS_ERR(s)) {
2434 error = PTR_ERR(s);
2435 goto out_free;
2436 }
2437
2438 if (s->s_fs_info != server) {
2439 nfs_free_server(server);
2440 server = NULL;
2441 } else {
2442 error = nfs_bdi_register(server);
2443 if (error)
2444 goto error_splat_super;
2445 }
2446
2447 if (!s->s_root) {
2448 /* initial superblock/root creation */
2449 nfs4_fill_super(s);
2450 nfs_fscache_get_super_cookie(s, data);
2451 }
2452
2453 mntroot = nfs4_get_root(s, mntfh);
2454 if (IS_ERR(mntroot)) {
2455 error = PTR_ERR(mntroot);
2456 goto error_splat_super;
2457 }
2458
2459 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2460 if (error)
2461 goto error_splat_root;
2462
2463 s->s_flags |= MS_ACTIVE;
2464 mnt->mnt_sb = s;
2465 mnt->mnt_root = mntroot;
2466 error = 0;
2467
2468 out:
2469 security_free_mnt_opts(&data->lsm_opts);
2470 out_free_fh:
2471 kfree(mntfh);
2472 return error;
2473
2474 out_free:
2475 nfs_free_server(server);
2476 goto out;
2477
2478 error_splat_root:
2479 dput(mntroot);
2480 error_splat_super:
2481 deactivate_locked_super(s);
2482 goto out;
2483 }
2484
2485 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2486 int flags, void *data, const char *hostname)
2487 {
2488 struct vfsmount *root_mnt;
2489 char *root_devname;
2490 size_t len;
2491
2492 len = strlen(hostname) + 3;
2493 root_devname = kmalloc(len, GFP_KERNEL);
2494 if (root_devname == NULL)
2495 return ERR_PTR(-ENOMEM);
2496 snprintf(root_devname, len, "%s:/", hostname);
2497 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2498 kfree(root_devname);
2499 return root_mnt;
2500 }
2501
2502 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2503 {
2504 char *page = (char *) __get_free_page(GFP_KERNEL);
2505 char *devname, *tmp;
2506
2507 if (page == NULL)
2508 return;
2509 devname = nfs_path(path->mnt->mnt_devname,
2510 path->mnt->mnt_root, path->dentry,
2511 page, PAGE_SIZE);
2512 if (devname == NULL)
2513 goto out_freepage;
2514 tmp = kstrdup(devname, GFP_KERNEL);
2515 if (tmp == NULL)
2516 goto out_freepage;
2517 kfree(mnt->mnt_devname);
2518 mnt->mnt_devname = tmp;
2519 out_freepage:
2520 free_page((unsigned long)page);
2521 }
2522
2523 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2524 const char *export_path, struct vfsmount *mnt_target)
2525 {
2526 struct mnt_namespace *ns_private;
2527 struct nameidata nd;
2528 struct super_block *s;
2529 int ret;
2530
2531 ns_private = create_mnt_ns(root_mnt);
2532 ret = PTR_ERR(ns_private);
2533 if (IS_ERR(ns_private))
2534 goto out_mntput;
2535
2536 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2537 export_path, LOOKUP_FOLLOW, &nd);
2538
2539 put_mnt_ns(ns_private);
2540
2541 if (ret != 0)
2542 goto out_err;
2543
2544 s = nd.path.mnt->mnt_sb;
2545 atomic_inc(&s->s_active);
2546 mnt_target->mnt_sb = s;
2547 mnt_target->mnt_root = dget(nd.path.dentry);
2548
2549 /* Correct the device pathname */
2550 nfs_fix_devname(&nd.path, mnt_target);
2551
2552 path_put(&nd.path);
2553 down_write(&s->s_umount);
2554 return 0;
2555 out_mntput:
2556 mntput(root_mnt);
2557 out_err:
2558 return ret;
2559 }
2560
2561 /*
2562 * Get the superblock for an NFS4 mountpoint
2563 */
2564 static int nfs4_get_sb(struct file_system_type *fs_type,
2565 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2566 {
2567 struct nfs_parsed_mount_data *data;
2568 char *export_path;
2569 struct vfsmount *root_mnt;
2570 int error = -ENOMEM;
2571
2572 data = kzalloc(sizeof(*data), GFP_KERNEL);
2573 if (data == NULL)
2574 goto out_free_data;
2575
2576 /* Validate the mount data */
2577 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2578 if (error < 0)
2579 goto out;
2580
2581 export_path = data->nfs_server.export_path;
2582 data->nfs_server.export_path = "/";
2583 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2584 data->nfs_server.hostname);
2585 data->nfs_server.export_path = export_path;
2586
2587 error = PTR_ERR(root_mnt);
2588 if (IS_ERR(root_mnt))
2589 goto out;
2590
2591 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2592
2593 out:
2594 kfree(data->client_address);
2595 kfree(data->nfs_server.export_path);
2596 kfree(data->nfs_server.hostname);
2597 kfree(data->fscache_uniq);
2598 out_free_data:
2599 kfree(data);
2600 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2601 error != 0 ? " [error]" : "");
2602 return error;
2603 }
2604
2605 static void nfs4_kill_super(struct super_block *sb)
2606 {
2607 struct nfs_server *server = NFS_SB(sb);
2608
2609 dprintk("--> %s\n", __func__);
2610 nfs_super_return_all_delegations(sb);
2611 kill_anon_super(sb);
2612 nfs4_renewd_prepare_shutdown(server);
2613 nfs_fscache_release_super_cookie(sb);
2614 nfs_free_server(server);
2615 dprintk("<-- %s\n", __func__);
2616 }
2617
2618 /*
2619 * Clone an NFS4 server record on xdev traversal (FSID-change)
2620 */
2621 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2622 const char *dev_name, void *raw_data,
2623 struct vfsmount *mnt)
2624 {
2625 struct nfs_clone_mount *data = raw_data;
2626 struct super_block *s;
2627 struct nfs_server *server;
2628 struct dentry *mntroot;
2629 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2630 struct nfs_sb_mountdata sb_mntdata = {
2631 .mntflags = flags,
2632 };
2633 int error;
2634
2635 dprintk("--> nfs4_xdev_get_sb()\n");
2636
2637 /* create a new volume representation */
2638 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2639 if (IS_ERR(server)) {
2640 error = PTR_ERR(server);
2641 goto out_err_noserver;
2642 }
2643 sb_mntdata.server = server;
2644
2645 if (server->flags & NFS4_MOUNT_UNSHARED)
2646 compare_super = NULL;
2647
2648 /* Get a superblock - note that we may end up sharing one that already exists */
2649 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2650 if (IS_ERR(s)) {
2651 error = PTR_ERR(s);
2652 goto out_err_nosb;
2653 }
2654
2655 if (s->s_fs_info != server) {
2656 nfs_free_server(server);
2657 server = NULL;
2658 } else {
2659 error = nfs_bdi_register(server);
2660 if (error)
2661 goto error_splat_super;
2662 }
2663
2664 if (!s->s_root) {
2665 /* initial superblock/root creation */
2666 nfs4_clone_super(s, data->sb);
2667 }
2668
2669 mntroot = nfs4_get_root(s, data->fh);
2670 if (IS_ERR(mntroot)) {
2671 error = PTR_ERR(mntroot);
2672 goto error_splat_super;
2673 }
2674 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2675 dput(mntroot);
2676 error = -ESTALE;
2677 goto error_splat_super;
2678 }
2679
2680 s->s_flags |= MS_ACTIVE;
2681 mnt->mnt_sb = s;
2682 mnt->mnt_root = mntroot;
2683
2684 security_sb_clone_mnt_opts(data->sb, s);
2685
2686 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2687 return 0;
2688
2689 out_err_nosb:
2690 nfs_free_server(server);
2691 out_err_noserver:
2692 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2693 return error;
2694
2695 error_splat_super:
2696 deactivate_locked_super(s);
2697 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2698 return error;
2699 }
2700
2701 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2702 int flags, const char *dev_name, void *raw_data,
2703 struct vfsmount *mnt)
2704 {
2705 struct nfs_clone_mount *data = raw_data;
2706 struct super_block *s;
2707 struct nfs_server *server;
2708 struct dentry *mntroot;
2709 struct nfs_fh mntfh;
2710 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2711 struct nfs_sb_mountdata sb_mntdata = {
2712 .mntflags = flags,
2713 };
2714 int error;
2715
2716 dprintk("--> nfs4_referral_get_sb()\n");
2717
2718 /* create a new volume representation */
2719 server = nfs4_create_referral_server(data, &mntfh);
2720 if (IS_ERR(server)) {
2721 error = PTR_ERR(server);
2722 goto out_err_noserver;
2723 }
2724 sb_mntdata.server = server;
2725
2726 if (server->flags & NFS4_MOUNT_UNSHARED)
2727 compare_super = NULL;
2728
2729 /* Get a superblock - note that we may end up sharing one that already exists */
2730 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2731 if (IS_ERR(s)) {
2732 error = PTR_ERR(s);
2733 goto out_err_nosb;
2734 }
2735
2736 if (s->s_fs_info != server) {
2737 nfs_free_server(server);
2738 server = NULL;
2739 } else {
2740 error = nfs_bdi_register(server);
2741 if (error)
2742 goto error_splat_super;
2743 }
2744
2745 if (!s->s_root) {
2746 /* initial superblock/root creation */
2747 nfs4_fill_super(s);
2748 }
2749
2750 mntroot = nfs4_get_root(s, &mntfh);
2751 if (IS_ERR(mntroot)) {
2752 error = PTR_ERR(mntroot);
2753 goto error_splat_super;
2754 }
2755 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2756 dput(mntroot);
2757 error = -ESTALE;
2758 goto error_splat_super;
2759 }
2760
2761 s->s_flags |= MS_ACTIVE;
2762 mnt->mnt_sb = s;
2763 mnt->mnt_root = mntroot;
2764
2765 security_sb_clone_mnt_opts(data->sb, s);
2766
2767 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2768 return 0;
2769
2770 out_err_nosb:
2771 nfs_free_server(server);
2772 out_err_noserver:
2773 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2774 return error;
2775
2776 error_splat_super:
2777 deactivate_locked_super(s);
2778 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2779 return error;
2780 }
2781
2782 /*
2783 * Create an NFS4 server record on referral traversal
2784 */
2785 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2786 int flags, const char *dev_name, void *raw_data,
2787 struct vfsmount *mnt)
2788 {
2789 struct nfs_clone_mount *data = raw_data;
2790 char *export_path;
2791 struct vfsmount *root_mnt;
2792 int error;
2793
2794 dprintk("--> nfs4_referral_get_sb()\n");
2795
2796 export_path = data->mnt_path;
2797 data->mnt_path = "/";
2798
2799 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2800 flags, data, data->hostname);
2801 data->mnt_path = export_path;
2802
2803 error = PTR_ERR(root_mnt);
2804 if (IS_ERR(root_mnt))
2805 goto out;
2806
2807 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2808 out:
2809 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2810 error != 0 ? " [error]" : "");
2811 return error;
2812 }
2813
2814 #endif /* CONFIG_NFS_V4 */
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