?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge commit 'linux-pnfs/nfs41-for-2.6.31' into nfsv41-for-2.6.31
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / super.c
blob6063054455f8587785cc3e65c31b1c68420f73e8
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/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <net/ipv6.h>
50 #include <linux/netdevice.h>
51 #include <linux/nfs_xdr.h>
52 #include <linux/magic.h>
53 #include <linux/parser.h>
54
55 #include <asm/system.h>
56 #include <asm/uaccess.h>
57
58 #include "nfs4_fs.h"
59 #include "callback.h"
60 #include "delegation.h"
61 #include "iostat.h"
62 #include "internal.h"
63 #include "fscache.h"
64
65 #define NFSDBG_FACILITY NFSDBG_VFS
66
67 enum {
68 /* Mount options that take no arguments */
69 Opt_soft, Opt_hard,
70 Opt_posix, Opt_noposix,
71 Opt_cto, Opt_nocto,
72 Opt_ac, Opt_noac,
73 Opt_lock, Opt_nolock,
74 Opt_v2, Opt_v3,
75 Opt_udp, Opt_tcp, Opt_rdma,
76 Opt_acl, Opt_noacl,
77 Opt_rdirplus, Opt_nordirplus,
78 Opt_sharecache, Opt_nosharecache,
79 Opt_resvport, Opt_noresvport,
80 Opt_fscache, Opt_nofscache,
81
82 /* Mount options that take integer arguments */
83 Opt_port,
84 Opt_rsize, Opt_wsize, Opt_bsize,
85 Opt_timeo, Opt_retrans,
86 Opt_acregmin, Opt_acregmax,
87 Opt_acdirmin, Opt_acdirmax,
88 Opt_actimeo,
89 Opt_namelen,
90 Opt_mountport,
91 Opt_mountvers,
92 Opt_nfsvers,
93 Opt_minorversion,
94
95 /* Mount options that take string arguments */
96 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
97 Opt_addr, Opt_mountaddr, Opt_clientaddr,
98 Opt_lookupcache,
99 Opt_fscache_uniq,
100
101 /* Special mount options */
102 Opt_userspace, Opt_deprecated, Opt_sloppy,
103
104 Opt_err
105 };
106
107 static const match_table_t nfs_mount_option_tokens = {
108 { Opt_userspace, "bg" },
109 { Opt_userspace, "fg" },
110 { Opt_userspace, "retry=%s" },
111
112 { Opt_sloppy, "sloppy" },
113
114 { Opt_soft, "soft" },
115 { Opt_hard, "hard" },
116 { Opt_deprecated, "intr" },
117 { Opt_deprecated, "nointr" },
118 { Opt_posix, "posix" },
119 { Opt_noposix, "noposix" },
120 { Opt_cto, "cto" },
121 { Opt_nocto, "nocto" },
122 { Opt_ac, "ac" },
123 { Opt_noac, "noac" },
124 { Opt_lock, "lock" },
125 { Opt_nolock, "nolock" },
126 { Opt_v2, "v2" },
127 { Opt_v3, "v3" },
128 { Opt_udp, "udp" },
129 { Opt_tcp, "tcp" },
130 { Opt_rdma, "rdma" },
131 { Opt_acl, "acl" },
132 { Opt_noacl, "noacl" },
133 { Opt_rdirplus, "rdirplus" },
134 { Opt_nordirplus, "nordirplus" },
135 { Opt_sharecache, "sharecache" },
136 { Opt_nosharecache, "nosharecache" },
137 { Opt_resvport, "resvport" },
138 { Opt_noresvport, "noresvport" },
139 { Opt_fscache, "fsc" },
140 { Opt_fscache_uniq, "fsc=%s" },
141 { Opt_nofscache, "nofsc" },
142
143 { Opt_port, "port=%u" },
144 { Opt_rsize, "rsize=%u" },
145 { Opt_wsize, "wsize=%u" },
146 { Opt_bsize, "bsize=%u" },
147 { Opt_timeo, "timeo=%u" },
148 { Opt_retrans, "retrans=%u" },
149 { Opt_acregmin, "acregmin=%u" },
150 { Opt_acregmax, "acregmax=%u" },
151 { Opt_acdirmin, "acdirmin=%u" },
152 { Opt_acdirmax, "acdirmax=%u" },
153 { Opt_actimeo, "actimeo=%u" },
154 { Opt_namelen, "namlen=%u" },
155 { Opt_mountport, "mountport=%u" },
156 { Opt_mountvers, "mountvers=%u" },
157 { Opt_nfsvers, "nfsvers=%u" },
158 { Opt_nfsvers, "vers=%u" },
159 { Opt_minorversion, "minorversion=%u" },
160
161 { Opt_sec, "sec=%s" },
162 { Opt_proto, "proto=%s" },
163 { Opt_mountproto, "mountproto=%s" },
164 { Opt_addr, "addr=%s" },
165 { Opt_clientaddr, "clientaddr=%s" },
166 { Opt_mounthost, "mounthost=%s" },
167 { Opt_mountaddr, "mountaddr=%s" },
168
169 { Opt_lookupcache, "lookupcache=%s" },
170
171 { Opt_err, NULL }
172 };
173
174 enum {
175 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
176
177 Opt_xprt_err
178 };
179
180 static const match_table_t nfs_xprt_protocol_tokens = {
181 { Opt_xprt_udp, "udp" },
182 { Opt_xprt_tcp, "tcp" },
183 { Opt_xprt_rdma, "rdma" },
184
185 { Opt_xprt_err, NULL }
186 };
187
188 enum {
189 Opt_sec_none, Opt_sec_sys,
190 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
191 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
192 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
193
194 Opt_sec_err
195 };
196
197 static const match_table_t nfs_secflavor_tokens = {
198 { Opt_sec_none, "none" },
199 { Opt_sec_none, "null" },
200 { Opt_sec_sys, "sys" },
201
202 { Opt_sec_krb5, "krb5" },
203 { Opt_sec_krb5i, "krb5i" },
204 { Opt_sec_krb5p, "krb5p" },
205
206 { Opt_sec_lkey, "lkey" },
207 { Opt_sec_lkeyi, "lkeyi" },
208 { Opt_sec_lkeyp, "lkeyp" },
209
210 { Opt_sec_spkm, "spkm3" },
211 { Opt_sec_spkmi, "spkm3i" },
212 { Opt_sec_spkmp, "spkm3p" },
213
214 { Opt_sec_err, NULL }
215 };
216
217 enum {
218 Opt_lookupcache_all, Opt_lookupcache_positive,
219 Opt_lookupcache_none,
220
221 Opt_lookupcache_err
222 };
223
224 static match_table_t nfs_lookupcache_tokens = {
225 { Opt_lookupcache_all, "all" },
226 { Opt_lookupcache_positive, "pos" },
227 { Opt_lookupcache_positive, "positive" },
228 { Opt_lookupcache_none, "none" },
229
230 { Opt_lookupcache_err, NULL }
231 };
232
233
234 static void nfs_umount_begin(struct super_block *);
235 static int nfs_statfs(struct dentry *, struct kstatfs *);
236 static int nfs_show_options(struct seq_file *, struct vfsmount *);
237 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
238 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
239 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
240 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
241 static void nfs_kill_super(struct super_block *);
242 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
243
244 static struct file_system_type nfs_fs_type = {
245 .owner = THIS_MODULE,
246 .name = "nfs",
247 .get_sb = nfs_get_sb,
248 .kill_sb = nfs_kill_super,
249 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
250 };
251
252 struct file_system_type nfs_xdev_fs_type = {
253 .owner = THIS_MODULE,
254 .name = "nfs",
255 .get_sb = nfs_xdev_get_sb,
256 .kill_sb = nfs_kill_super,
257 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
258 };
259
260 static const struct super_operations nfs_sops = {
261 .alloc_inode = nfs_alloc_inode,
262 .destroy_inode = nfs_destroy_inode,
263 .write_inode = nfs_write_inode,
264 .statfs = nfs_statfs,
265 .clear_inode = nfs_clear_inode,
266 .umount_begin = nfs_umount_begin,
267 .show_options = nfs_show_options,
268 .show_stats = nfs_show_stats,
269 .remount_fs = nfs_remount,
270 };
271
272 #ifdef CONFIG_NFS_V4
273 static int nfs4_get_sb(struct file_system_type *fs_type,
274 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
275 static int nfs4_xdev_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_referral_get_sb(struct file_system_type *fs_type,
278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
279 static void nfs4_kill_super(struct super_block *sb);
280
281 static struct file_system_type nfs4_fs_type = {
282 .owner = THIS_MODULE,
283 .name = "nfs4",
284 .get_sb = nfs4_get_sb,
285 .kill_sb = nfs4_kill_super,
286 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
287 };
288
289 struct file_system_type nfs4_xdev_fs_type = {
290 .owner = THIS_MODULE,
291 .name = "nfs4",
292 .get_sb = nfs4_xdev_get_sb,
293 .kill_sb = nfs4_kill_super,
294 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
295 };
296
297 struct file_system_type nfs4_referral_fs_type = {
298 .owner = THIS_MODULE,
299 .name = "nfs4",
300 .get_sb = nfs4_referral_get_sb,
301 .kill_sb = nfs4_kill_super,
302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
303 };
304
305 static const struct super_operations nfs4_sops = {
306 .alloc_inode = nfs_alloc_inode,
307 .destroy_inode = nfs_destroy_inode,
308 .write_inode = nfs_write_inode,
309 .statfs = nfs_statfs,
310 .clear_inode = nfs4_clear_inode,
311 .umount_begin = nfs_umount_begin,
312 .show_options = nfs_show_options,
313 .show_stats = nfs_show_stats,
314 .remount_fs = nfs_remount,
315 };
316 #endif
317
318 static struct shrinker acl_shrinker = {
319 .shrink = nfs_access_cache_shrinker,
320 .seeks = DEFAULT_SEEKS,
321 };
322
323 /*
324 * Register the NFS filesystems
325 */
326 int __init register_nfs_fs(void)
327 {
328 int ret;
329
330 ret = register_filesystem(&nfs_fs_type);
331 if (ret < 0)
332 goto error_0;
333
334 ret = nfs_register_sysctl();
335 if (ret < 0)
336 goto error_1;
337 #ifdef CONFIG_NFS_V4
338 ret = register_filesystem(&nfs4_fs_type);
339 if (ret < 0)
340 goto error_2;
341 #endif
342 register_shrinker(&acl_shrinker);
343 return 0;
344
345 #ifdef CONFIG_NFS_V4
346 error_2:
347 nfs_unregister_sysctl();
348 #endif
349 error_1:
350 unregister_filesystem(&nfs_fs_type);
351 error_0:
352 return ret;
353 }
354
355 /*
356 * Unregister the NFS filesystems
357 */
358 void __exit unregister_nfs_fs(void)
359 {
360 unregister_shrinker(&acl_shrinker);
361 #ifdef CONFIG_NFS_V4
362 unregister_filesystem(&nfs4_fs_type);
363 #endif
364 nfs_unregister_sysctl();
365 unregister_filesystem(&nfs_fs_type);
366 }
367
368 void nfs_sb_active(struct super_block *sb)
369 {
370 struct nfs_server *server = NFS_SB(sb);
371
372 if (atomic_inc_return(&server->active) == 1)
373 atomic_inc(&sb->s_active);
374 }
375
376 void nfs_sb_deactive(struct super_block *sb)
377 {
378 struct nfs_server *server = NFS_SB(sb);
379
380 if (atomic_dec_and_test(&server->active))
381 deactivate_super(sb);
382 }
383
384 /*
385 * Deliver file system statistics to userspace
386 */
387 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
388 {
389 struct nfs_server *server = NFS_SB(dentry->d_sb);
390 unsigned char blockbits;
391 unsigned long blockres;
392 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
393 struct nfs_fattr fattr;
394 struct nfs_fsstat res = {
395 .fattr = &fattr,
396 };
397 int error;
398
399 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
400 if (error < 0)
401 goto out_err;
402 buf->f_type = NFS_SUPER_MAGIC;
403
404 /*
405 * Current versions of glibc do not correctly handle the
406 * case where f_frsize != f_bsize. Eventually we want to
407 * report the value of wtmult in this field.
408 */
409 buf->f_frsize = dentry->d_sb->s_blocksize;
410
411 /*
412 * On most *nix systems, f_blocks, f_bfree, and f_bavail
413 * are reported in units of f_frsize. Linux hasn't had
414 * an f_frsize field in its statfs struct until recently,
415 * thus historically Linux's sys_statfs reports these
416 * fields in units of f_bsize.
417 */
418 buf->f_bsize = dentry->d_sb->s_blocksize;
419 blockbits = dentry->d_sb->s_blocksize_bits;
420 blockres = (1 << blockbits) - 1;
421 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
422 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
423 buf->f_bavail = (res.abytes + blockres) >> blockbits;
424
425 buf->f_files = res.tfiles;
426 buf->f_ffree = res.afiles;
427
428 buf->f_namelen = server->namelen;
429
430 return 0;
431
432 out_err:
433 dprintk("%s: statfs error = %d\n", __func__, -error);
434 return error;
435 }
436
437 /*
438 * Map the security flavour number to a name
439 */
440 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
441 {
442 static const struct {
443 rpc_authflavor_t flavour;
444 const char *str;
445 } sec_flavours[] = {
446 { RPC_AUTH_NULL, "null" },
447 { RPC_AUTH_UNIX, "sys" },
448 { RPC_AUTH_GSS_KRB5, "krb5" },
449 { RPC_AUTH_GSS_KRB5I, "krb5i" },
450 { RPC_AUTH_GSS_KRB5P, "krb5p" },
451 { RPC_AUTH_GSS_LKEY, "lkey" },
452 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
453 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
454 { RPC_AUTH_GSS_SPKM, "spkm" },
455 { RPC_AUTH_GSS_SPKMI, "spkmi" },
456 { RPC_AUTH_GSS_SPKMP, "spkmp" },
457 { UINT_MAX, "unknown" }
458 };
459 int i;
460
461 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
462 if (sec_flavours[i].flavour == flavour)
463 break;
464 }
465 return sec_flavours[i].str;
466 }
467
468 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
469 int showdefaults)
470 {
471 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
472
473 switch (sap->sa_family) {
474 case AF_INET: {
475 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
476 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
477 break;
478 }
479 case AF_INET6: {
480 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
481 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
482 break;
483 }
484 default:
485 if (showdefaults)
486 seq_printf(m, ",mountaddr=unspecified");
487 }
488
489 if (nfss->mountd_version || showdefaults)
490 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
491 if (nfss->mountd_port || showdefaults)
492 seq_printf(m, ",mountport=%u", nfss->mountd_port);
493
494 switch (nfss->mountd_protocol) {
495 case IPPROTO_UDP:
496 seq_printf(m, ",mountproto=udp");
497 break;
498 case IPPROTO_TCP:
499 seq_printf(m, ",mountproto=tcp");
500 break;
501 default:
502 if (showdefaults)
503 seq_printf(m, ",mountproto=auto");
504 }
505 }
506
507 /*
508 * Describe the mount options in force on this server representation
509 */
510 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
511 int showdefaults)
512 {
513 static const struct proc_nfs_info {
514 int flag;
515 const char *str;
516 const char *nostr;
517 } nfs_info[] = {
518 { NFS_MOUNT_SOFT, ",soft", ",hard" },
519 { NFS_MOUNT_INTR, ",intr", ",nointr" },
520 { NFS_MOUNT_POSIX, ",posix", "" },
521 { NFS_MOUNT_NOCTO, ",nocto", "" },
522 { NFS_MOUNT_NOAC, ",noac", "" },
523 { NFS_MOUNT_NONLM, ",nolock", "" },
524 { NFS_MOUNT_NOACL, ",noacl", "" },
525 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
526 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
527 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
528 { 0, NULL, NULL }
529 };
530 const struct proc_nfs_info *nfs_infop;
531 struct nfs_client *clp = nfss->nfs_client;
532 u32 version = clp->rpc_ops->version;
533
534 seq_printf(m, ",vers=%u", version);
535 seq_printf(m, ",rsize=%u", nfss->rsize);
536 seq_printf(m, ",wsize=%u", nfss->wsize);
537 if (nfss->bsize != 0)
538 seq_printf(m, ",bsize=%u", nfss->bsize);
539 seq_printf(m, ",namlen=%u", nfss->namelen);
540 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
541 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
542 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
543 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
544 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
545 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
546 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
547 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
548 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
549 if (nfss->flags & nfs_infop->flag)
550 seq_puts(m, nfs_infop->str);
551 else
552 seq_puts(m, nfs_infop->nostr);
553 }
554 seq_printf(m, ",proto=%s",
555 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
556 if (version == 4) {
557 if (nfss->port != NFS_PORT)
558 seq_printf(m, ",port=%u", nfss->port);
559 } else
560 if (nfss->port)
561 seq_printf(m, ",port=%u", nfss->port);
562
563 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
564 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
565 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
566
567 if (version != 4)
568 nfs_show_mountd_options(m, nfss, showdefaults);
569
570 #ifdef CONFIG_NFS_V4
571 if (clp->rpc_ops->version == 4)
572 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
573 #endif
574 if (nfss->options & NFS_OPTION_FSCACHE)
575 seq_printf(m, ",fsc");
576 }
577
578 /*
579 * Describe the mount options on this VFS mountpoint
580 */
581 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
582 {
583 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
584
585 nfs_show_mount_options(m, nfss, 0);
586
587 seq_printf(m, ",addr=%s",
588 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
589 RPC_DISPLAY_ADDR));
590
591 return 0;
592 }
593
594 /*
595 * Present statistical information for this VFS mountpoint
596 */
597 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
598 {
599 int i, cpu;
600 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
601 struct rpc_auth *auth = nfss->client->cl_auth;
602 struct nfs_iostats totals = { };
603
604 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
605
606 /*
607 * Display all mount option settings
608 */
609 seq_printf(m, "\n\topts:\t");
610 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
611 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
612 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
613 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
614 nfs_show_mount_options(m, nfss, 1);
615
616 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
617
618 seq_printf(m, "\n\tcaps:\t");
619 seq_printf(m, "caps=0x%x", nfss->caps);
620 seq_printf(m, ",wtmult=%u", nfss->wtmult);
621 seq_printf(m, ",dtsize=%u", nfss->dtsize);
622 seq_printf(m, ",bsize=%u", nfss->bsize);
623 seq_printf(m, ",namlen=%u", nfss->namelen);
624
625 #ifdef CONFIG_NFS_V4
626 if (nfss->nfs_client->rpc_ops->version == 4) {
627 seq_printf(m, "\n\tnfsv4:\t");
628 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
629 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
630 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
631 }
632 #endif
633
634 /*
635 * Display security flavor in effect for this mount
636 */
637 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
638 if (auth->au_flavor)
639 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
640
641 /*
642 * Display superblock I/O counters
643 */
644 for_each_possible_cpu(cpu) {
645 struct nfs_iostats *stats;
646
647 preempt_disable();
648 stats = per_cpu_ptr(nfss->io_stats, cpu);
649
650 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
651 totals.events[i] += stats->events[i];
652 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
653 totals.bytes[i] += stats->bytes[i];
654 #ifdef CONFIG_NFS_FSCACHE
655 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
656 totals.fscache[i] += stats->fscache[i];
657 #endif
658
659 preempt_enable();
660 }
661
662 seq_printf(m, "\n\tevents:\t");
663 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
664 seq_printf(m, "%lu ", totals.events[i]);
665 seq_printf(m, "\n\tbytes:\t");
666 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
667 seq_printf(m, "%Lu ", totals.bytes[i]);
668 #ifdef CONFIG_NFS_FSCACHE
669 if (nfss->options & NFS_OPTION_FSCACHE) {
670 seq_printf(m, "\n\tfsc:\t");
671 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
672 seq_printf(m, "%Lu ", totals.bytes[i]);
673 }
674 #endif
675 seq_printf(m, "\n");
676
677 rpc_print_iostats(m, nfss->client);
678
679 return 0;
680 }
681
682 /*
683 * Begin unmount by attempting to remove all automounted mountpoints we added
684 * in response to xdev traversals and referrals
685 */
686 static void nfs_umount_begin(struct super_block *sb)
687 {
688 struct nfs_server *server;
689 struct rpc_clnt *rpc;
690
691 lock_kernel();
692
693 server = NFS_SB(sb);
694 /* -EIO all pending I/O */
695 rpc = server->client_acl;
696 if (!IS_ERR(rpc))
697 rpc_killall_tasks(rpc);
698 rpc = server->client;
699 if (!IS_ERR(rpc))
700 rpc_killall_tasks(rpc);
701
702 unlock_kernel();
703 }
704
705 /*
706 * Sanity-check a server address provided by the mount command.
707 *
708 * Address family must be initialized, and address must not be
709 * the ANY address for that family.
710 */
711 static int nfs_verify_server_address(struct sockaddr *addr)
712 {
713 switch (addr->sa_family) {
714 case AF_INET: {
715 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
716 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
717 }
718 case AF_INET6: {
719 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
720 return !ipv6_addr_any(sa);
721 }
722 }
723
724 return 0;
725 }
726
727 static void nfs_parse_ipv4_address(char *string, size_t str_len,
728 struct sockaddr *sap, size_t *addr_len)
729 {
730 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
731 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
732
733 if (str_len <= INET_ADDRSTRLEN) {
734 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
735 (int)str_len, string);
736
737 sin->sin_family = AF_INET;
738 *addr_len = sizeof(*sin);
739 if (in4_pton(string, str_len, addr, '\0', NULL))
740 return;
741 }
742
743 sap->sa_family = AF_UNSPEC;
744 *addr_len = 0;
745 }
746
747 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
748 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
749 const char *delim,
750 struct sockaddr_in6 *sin6)
751 {
752 char *p;
753 size_t len;
754
755 if ((string + str_len) == delim)
756 return 1;
757
758 if (*delim != IPV6_SCOPE_DELIMITER)
759 return 0;
760
761 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
762 return 0;
763
764 len = (string + str_len) - delim - 1;
765 p = kstrndup(delim + 1, len, GFP_KERNEL);
766 if (p) {
767 unsigned long scope_id = 0;
768 struct net_device *dev;
769
770 dev = dev_get_by_name(&init_net, p);
771 if (dev != NULL) {
772 scope_id = dev->ifindex;
773 dev_put(dev);
774 } else {
775 if (strict_strtoul(p, 10, &scope_id) == 0) {
776 kfree(p);
777 return 0;
778 }
779 }
780
781 kfree(p);
782
783 sin6->sin6_scope_id = scope_id;
784 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
785 return 1;
786 }
787
788 return 0;
789 }
790
791 static void nfs_parse_ipv6_address(char *string, size_t str_len,
792 struct sockaddr *sap, size_t *addr_len)
793 {
794 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
795 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
796 const char *delim;
797
798 if (str_len <= INET6_ADDRSTRLEN) {
799 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
800 (int)str_len, string);
801
802 sin6->sin6_family = AF_INET6;
803 *addr_len = sizeof(*sin6);
804 if (in6_pton(string, str_len, addr,
805 IPV6_SCOPE_DELIMITER, &delim) != 0) {
806 if (nfs_parse_ipv6_scope_id(string, str_len,
807 delim, sin6) != 0)
808 return;
809 }
810 }
811
812 sap->sa_family = AF_UNSPEC;
813 *addr_len = 0;
814 }
815 #else
816 static void nfs_parse_ipv6_address(char *string, size_t str_len,
817 struct sockaddr *sap, size_t *addr_len)
818 {
819 sap->sa_family = AF_UNSPEC;
820 *addr_len = 0;
821 }
822 #endif
823
824 /*
825 * Construct a sockaddr based on the contents of a string that contains
826 * an IP address in presentation format.
827 *
828 * If there is a problem constructing the new sockaddr, set the address
829 * family to AF_UNSPEC.
830 */
831 void nfs_parse_ip_address(char *string, size_t str_len,
832 struct sockaddr *sap, size_t *addr_len)
833 {
834 unsigned int i, colons;
835
836 colons = 0;
837 for (i = 0; i < str_len; i++)
838 if (string[i] == ':')
839 colons++;
840
841 if (colons >= 2)
842 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
843 else
844 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
845 }
846
847 /*
848 * Sanity check the NFS transport protocol.
849 *
850 */
851 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
852 {
853 switch (mnt->nfs_server.protocol) {
854 case XPRT_TRANSPORT_UDP:
855 case XPRT_TRANSPORT_TCP:
856 case XPRT_TRANSPORT_RDMA:
857 break;
858 default:
859 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
860 }
861 }
862
863 /*
864 * For text based NFSv2/v3 mounts, the mount protocol transport default
865 * settings should depend upon the specified NFS transport.
866 */
867 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
868 {
869 nfs_validate_transport_protocol(mnt);
870
871 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
872 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
873 return;
874 switch (mnt->nfs_server.protocol) {
875 case XPRT_TRANSPORT_UDP:
876 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
877 break;
878 case XPRT_TRANSPORT_TCP:
879 case XPRT_TRANSPORT_RDMA:
880 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
881 }
882 }
883
884 /*
885 * Parse the value of the 'sec=' option.
886 *
887 * The flavor_len setting is for v4 mounts.
888 */
889 static int nfs_parse_security_flavors(char *value,
890 struct nfs_parsed_mount_data *mnt)
891 {
892 substring_t args[MAX_OPT_ARGS];
893
894 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
895
896 switch (match_token(value, nfs_secflavor_tokens, args)) {
897 case Opt_sec_none:
898 mnt->auth_flavor_len = 0;
899 mnt->auth_flavors[0] = RPC_AUTH_NULL;
900 break;
901 case Opt_sec_sys:
902 mnt->auth_flavor_len = 0;
903 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
904 break;
905 case Opt_sec_krb5:
906 mnt->auth_flavor_len = 1;
907 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
908 break;
909 case Opt_sec_krb5i:
910 mnt->auth_flavor_len = 1;
911 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
912 break;
913 case Opt_sec_krb5p:
914 mnt->auth_flavor_len = 1;
915 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
916 break;
917 case Opt_sec_lkey:
918 mnt->auth_flavor_len = 1;
919 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
920 break;
921 case Opt_sec_lkeyi:
922 mnt->auth_flavor_len = 1;
923 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
924 break;
925 case Opt_sec_lkeyp:
926 mnt->auth_flavor_len = 1;
927 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
928 break;
929 case Opt_sec_spkm:
930 mnt->auth_flavor_len = 1;
931 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
932 break;
933 case Opt_sec_spkmi:
934 mnt->auth_flavor_len = 1;
935 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
936 break;
937 case Opt_sec_spkmp:
938 mnt->auth_flavor_len = 1;
939 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
940 break;
941 default:
942 return 0;
943 }
944
945 return 1;
946 }
947
948 static void nfs_parse_invalid_value(const char *option)
949 {
950 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
951 }
952
953 /*
954 * Error-check and convert a string of mount options from user space into
955 * a data structure. The whole mount string is processed; bad options are
956 * skipped as they are encountered. If there were no errors, return 1;
957 * otherwise return 0 (zero).
958 */
959 static int nfs_parse_mount_options(char *raw,
960 struct nfs_parsed_mount_data *mnt)
961 {
962 char *p, *string, *secdata;
963 int rc, sloppy = 0, errors = 0;
964
965 if (!raw) {
966 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
967 return 1;
968 }
969 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
970
971 secdata = alloc_secdata();
972 if (!secdata)
973 goto out_nomem;
974
975 rc = security_sb_copy_data(raw, secdata);
976 if (rc)
977 goto out_security_failure;
978
979 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
980 if (rc)
981 goto out_security_failure;
982
983 free_secdata(secdata);
984
985 while ((p = strsep(&raw, ",")) != NULL) {
986 substring_t args[MAX_OPT_ARGS];
987 int option, token;
988
989 if (!*p)
990 continue;
991
992 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
993
994 token = match_token(p, nfs_mount_option_tokens, args);
995 switch (token) {
996
997 /*
998 * boolean options: foo/nofoo
999 */
1000 case Opt_soft:
1001 mnt->flags |= NFS_MOUNT_SOFT;
1002 break;
1003 case Opt_hard:
1004 mnt->flags &= ~NFS_MOUNT_SOFT;
1005 break;
1006 case Opt_posix:
1007 mnt->flags |= NFS_MOUNT_POSIX;
1008 break;
1009 case Opt_noposix:
1010 mnt->flags &= ~NFS_MOUNT_POSIX;
1011 break;
1012 case Opt_cto:
1013 mnt->flags &= ~NFS_MOUNT_NOCTO;
1014 break;
1015 case Opt_nocto:
1016 mnt->flags |= NFS_MOUNT_NOCTO;
1017 break;
1018 case Opt_ac:
1019 mnt->flags &= ~NFS_MOUNT_NOAC;
1020 break;
1021 case Opt_noac:
1022 mnt->flags |= NFS_MOUNT_NOAC;
1023 break;
1024 case Opt_lock:
1025 mnt->flags &= ~NFS_MOUNT_NONLM;
1026 break;
1027 case Opt_nolock:
1028 mnt->flags |= NFS_MOUNT_NONLM;
1029 break;
1030 case Opt_v2:
1031 mnt->flags &= ~NFS_MOUNT_VER3;
1032 break;
1033 case Opt_v3:
1034 mnt->flags |= NFS_MOUNT_VER3;
1035 break;
1036 case Opt_udp:
1037 mnt->flags &= ~NFS_MOUNT_TCP;
1038 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1039 break;
1040 case Opt_tcp:
1041 mnt->flags |= NFS_MOUNT_TCP;
1042 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1043 break;
1044 case Opt_rdma:
1045 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1046 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1047 xprt_load_transport(p);
1048 break;
1049 case Opt_acl:
1050 mnt->flags &= ~NFS_MOUNT_NOACL;
1051 break;
1052 case Opt_noacl:
1053 mnt->flags |= NFS_MOUNT_NOACL;
1054 break;
1055 case Opt_rdirplus:
1056 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1057 break;
1058 case Opt_nordirplus:
1059 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1060 break;
1061 case Opt_sharecache:
1062 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1063 break;
1064 case Opt_nosharecache:
1065 mnt->flags |= NFS_MOUNT_UNSHARED;
1066 break;
1067 case Opt_resvport:
1068 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1069 break;
1070 case Opt_noresvport:
1071 mnt->flags |= NFS_MOUNT_NORESVPORT;
1072 break;
1073 case Opt_fscache:
1074 mnt->options |= NFS_OPTION_FSCACHE;
1075 kfree(mnt->fscache_uniq);
1076 mnt->fscache_uniq = NULL;
1077 break;
1078 case Opt_nofscache:
1079 mnt->options &= ~NFS_OPTION_FSCACHE;
1080 kfree(mnt->fscache_uniq);
1081 mnt->fscache_uniq = NULL;
1082 break;
1083 case Opt_fscache_uniq:
1084 string = match_strdup(args);
1085 if (!string)
1086 goto out_nomem;
1087 kfree(mnt->fscache_uniq);
1088 mnt->fscache_uniq = string;
1089 mnt->options |= NFS_OPTION_FSCACHE;
1090 break;
1091
1092 /*
1093 * options that take numeric values
1094 */
1095 case Opt_port:
1096 if (match_int(args, &option) ||
1097 option < 0 || option > USHORT_MAX) {
1098 errors++;
1099 nfs_parse_invalid_value("port");
1100 } else
1101 mnt->nfs_server.port = option;
1102 break;
1103 case Opt_rsize:
1104 if (match_int(args, &option) || option < 0) {
1105 errors++;
1106 nfs_parse_invalid_value("rsize");
1107 } else
1108 mnt->rsize = option;
1109 break;
1110 case Opt_wsize:
1111 if (match_int(args, &option) || option < 0) {
1112 errors++;
1113 nfs_parse_invalid_value("wsize");
1114 } else
1115 mnt->wsize = option;
1116 break;
1117 case Opt_bsize:
1118 if (match_int(args, &option) || option < 0) {
1119 errors++;
1120 nfs_parse_invalid_value("bsize");
1121 } else
1122 mnt->bsize = option;
1123 break;
1124 case Opt_timeo:
1125 if (match_int(args, &option) || option <= 0) {
1126 errors++;
1127 nfs_parse_invalid_value("timeo");
1128 } else
1129 mnt->timeo = option;
1130 break;
1131 case Opt_retrans:
1132 if (match_int(args, &option) || option <= 0) {
1133 errors++;
1134 nfs_parse_invalid_value("retrans");
1135 } else
1136 mnt->retrans = option;
1137 break;
1138 case Opt_acregmin:
1139 if (match_int(args, &option) || option < 0) {
1140 errors++;
1141 nfs_parse_invalid_value("acregmin");
1142 } else
1143 mnt->acregmin = option;
1144 break;
1145 case Opt_acregmax:
1146 if (match_int(args, &option) || option < 0) {
1147 errors++;
1148 nfs_parse_invalid_value("acregmax");
1149 } else
1150 mnt->acregmax = option;
1151 break;
1152 case Opt_acdirmin:
1153 if (match_int(args, &option) || option < 0) {
1154 errors++;
1155 nfs_parse_invalid_value("acdirmin");
1156 } else
1157 mnt->acdirmin = option;
1158 break;
1159 case Opt_acdirmax:
1160 if (match_int(args, &option) || option < 0) {
1161 errors++;
1162 nfs_parse_invalid_value("acdirmax");
1163 } else
1164 mnt->acdirmax = option;
1165 break;
1166 case Opt_actimeo:
1167 if (match_int(args, &option) || option < 0) {
1168 errors++;
1169 nfs_parse_invalid_value("actimeo");
1170 } else
1171 mnt->acregmin = mnt->acregmax =
1172 mnt->acdirmin = mnt->acdirmax = option;
1173 break;
1174 case Opt_namelen:
1175 if (match_int(args, &option) || option < 0) {
1176 errors++;
1177 nfs_parse_invalid_value("namlen");
1178 } else
1179 mnt->namlen = option;
1180 break;
1181 case Opt_mountport:
1182 if (match_int(args, &option) ||
1183 option < 0 || option > USHORT_MAX) {
1184 errors++;
1185 nfs_parse_invalid_value("mountport");
1186 } else
1187 mnt->mount_server.port = option;
1188 break;
1189 case Opt_mountvers:
1190 if (match_int(args, &option) ||
1191 option < NFS_MNT_VERSION ||
1192 option > NFS_MNT3_VERSION) {
1193 errors++;
1194 nfs_parse_invalid_value("mountvers");
1195 } else
1196 mnt->mount_server.version = option;
1197 break;
1198 case Opt_nfsvers:
1199 if (match_int(args, &option)) {
1200 errors++;
1201 nfs_parse_invalid_value("nfsvers");
1202 break;
1203 }
1204 switch (option) {
1205 case NFS2_VERSION:
1206 mnt->flags &= ~NFS_MOUNT_VER3;
1207 break;
1208 case NFS3_VERSION:
1209 mnt->flags |= NFS_MOUNT_VER3;
1210 break;
1211 default:
1212 errors++;
1213 nfs_parse_invalid_value("nfsvers");
1214 }
1215 break;
1216 case Opt_minorversion:
1217 if (match_int(args, &option))
1218 return 0;
1219 if (option < 0 || option > NFS4_MAX_MINOR_VERSION)
1220 return 0;
1221 mnt->minorversion = option;
1222 break;
1223
1224 /*
1225 * options that take text values
1226 */
1227 case Opt_sec:
1228 string = match_strdup(args);
1229 if (string == NULL)
1230 goto out_nomem;
1231 rc = nfs_parse_security_flavors(string, mnt);
1232 kfree(string);
1233 if (!rc) {
1234 errors++;
1235 dfprintk(MOUNT, "NFS: unrecognized "
1236 "security flavor\n");
1237 }
1238 break;
1239 case Opt_proto:
1240 string = match_strdup(args);
1241 if (string == NULL)
1242 goto out_nomem;
1243 token = match_token(string,
1244 nfs_xprt_protocol_tokens, args);
1245
1246 switch (token) {
1247 case Opt_xprt_udp:
1248 mnt->flags &= ~NFS_MOUNT_TCP;
1249 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1250 break;
1251 case Opt_xprt_tcp:
1252 mnt->flags |= NFS_MOUNT_TCP;
1253 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1254 break;
1255 case Opt_xprt_rdma:
1256 /* vector side protocols to TCP */
1257 mnt->flags |= NFS_MOUNT_TCP;
1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1259 xprt_load_transport(string);
1260 break;
1261 default:
1262 errors++;
1263 dfprintk(MOUNT, "NFS: unrecognized "
1264 "transport protocol\n");
1265 }
1266 kfree(string);
1267 break;
1268 case Opt_mountproto:
1269 string = match_strdup(args);
1270 if (string == NULL)
1271 goto out_nomem;
1272 token = match_token(string,
1273 nfs_xprt_protocol_tokens, args);
1274 kfree(string);
1275
1276 switch (token) {
1277 case Opt_xprt_udp:
1278 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1279 break;
1280 case Opt_xprt_tcp:
1281 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1282 break;
1283 case Opt_xprt_rdma: /* not used for side protocols */
1284 default:
1285 errors++;
1286 dfprintk(MOUNT, "NFS: unrecognized "
1287 "transport protocol\n");
1288 }
1289 break;
1290 case Opt_addr:
1291 string = match_strdup(args);
1292 if (string == NULL)
1293 goto out_nomem;
1294 nfs_parse_ip_address(string, strlen(string),
1295 (struct sockaddr *)
1296 &mnt->nfs_server.address,
1297 &mnt->nfs_server.addrlen);
1298 kfree(string);
1299 break;
1300 case Opt_clientaddr:
1301 string = match_strdup(args);
1302 if (string == NULL)
1303 goto out_nomem;
1304 kfree(mnt->client_address);
1305 mnt->client_address = string;
1306 break;
1307 case Opt_mounthost:
1308 string = match_strdup(args);
1309 if (string == NULL)
1310 goto out_nomem;
1311 kfree(mnt->mount_server.hostname);
1312 mnt->mount_server.hostname = string;
1313 break;
1314 case Opt_mountaddr:
1315 string = match_strdup(args);
1316 if (string == NULL)
1317 goto out_nomem;
1318 nfs_parse_ip_address(string, strlen(string),
1319 (struct sockaddr *)
1320 &mnt->mount_server.address,
1321 &mnt->mount_server.addrlen);
1322 kfree(string);
1323 break;
1324 case Opt_lookupcache:
1325 string = match_strdup(args);
1326 if (string == NULL)
1327 goto out_nomem;
1328 token = match_token(string,
1329 nfs_lookupcache_tokens, args);
1330 kfree(string);
1331 switch (token) {
1332 case Opt_lookupcache_all:
1333 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1334 break;
1335 case Opt_lookupcache_positive:
1336 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1337 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1338 break;
1339 case Opt_lookupcache_none:
1340 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1341 break;
1342 default:
1343 errors++;
1344 dfprintk(MOUNT, "NFS: invalid "
1345 "lookupcache argument\n");
1346 };
1347 break;
1348
1349 /*
1350 * Special options
1351 */
1352 case Opt_sloppy:
1353 sloppy = 1;
1354 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1355 break;
1356 case Opt_userspace:
1357 case Opt_deprecated:
1358 dfprintk(MOUNT, "NFS: ignoring mount option "
1359 "'%s'\n", p);
1360 break;
1361
1362 default:
1363 errors++;
1364 dfprintk(MOUNT, "NFS: unrecognized mount option "
1365 "'%s'\n", p);
1366 }
1367 }
1368
1369 if (errors > 0) {
1370 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1371 errors, (errors == 1 ? "" : "s"));
1372 if (!sloppy)
1373 return 0;
1374 }
1375 return 1;
1376
1377 out_nomem:
1378 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1379 return 0;
1380 out_security_failure:
1381 free_secdata(secdata);
1382 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1383 return 0;
1384 }
1385
1386 /*
1387 * Use the remote server's MOUNT service to request the NFS file handle
1388 * corresponding to the provided path.
1389 */
1390 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1391 struct nfs_fh *root_fh)
1392 {
1393 struct nfs_mount_request request = {
1394 .sap = (struct sockaddr *)
1395 &args->mount_server.address,
1396 .dirpath = args->nfs_server.export_path,
1397 .protocol = args->mount_server.protocol,
1398 .fh = root_fh,
1399 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1400 };
1401 int status;
1402
1403 if (args->mount_server.version == 0) {
1404 if (args->flags & NFS_MOUNT_VER3)
1405 args->mount_server.version = NFS_MNT3_VERSION;
1406 else
1407 args->mount_server.version = NFS_MNT_VERSION;
1408 }
1409 request.version = args->mount_server.version;
1410
1411 if (args->mount_server.hostname)
1412 request.hostname = args->mount_server.hostname;
1413 else
1414 request.hostname = args->nfs_server.hostname;
1415
1416 /*
1417 * Construct the mount server's address.
1418 */
1419 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1420 memcpy(request.sap, &args->nfs_server.address,
1421 args->nfs_server.addrlen);
1422 args->mount_server.addrlen = args->nfs_server.addrlen;
1423 }
1424 request.salen = args->mount_server.addrlen;
1425
1426 /*
1427 * autobind will be used if mount_server.port == 0
1428 */
1429 nfs_set_port(request.sap, args->mount_server.port);
1430
1431 /*
1432 * Now ask the mount server to map our export path
1433 * to a file handle.
1434 */
1435 status = nfs_mount(&request);
1436 if (status == 0)
1437 return 0;
1438
1439 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1440 request.hostname, status);
1441 return status;
1442 }
1443
1444 static int nfs_parse_simple_hostname(const char *dev_name,
1445 char **hostname, size_t maxnamlen,
1446 char **export_path, size_t maxpathlen)
1447 {
1448 size_t len;
1449 char *colon, *comma;
1450
1451 colon = strchr(dev_name, ':');
1452 if (colon == NULL)
1453 goto out_bad_devname;
1454
1455 len = colon - dev_name;
1456 if (len > maxnamlen)
1457 goto out_hostname;
1458
1459 /* N.B. caller will free nfs_server.hostname in all cases */
1460 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1461 if (!*hostname)
1462 goto out_nomem;
1463
1464 /* kill possible hostname list: not supported */
1465 comma = strchr(*hostname, ',');
1466 if (comma != NULL) {
1467 if (comma == *hostname)
1468 goto out_bad_devname;
1469 *comma = '\0';
1470 }
1471
1472 colon++;
1473 len = strlen(colon);
1474 if (len > maxpathlen)
1475 goto out_path;
1476 *export_path = kstrndup(colon, len, GFP_KERNEL);
1477 if (!*export_path)
1478 goto out_nomem;
1479
1480 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1481 return 0;
1482
1483 out_bad_devname:
1484 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1485 return -EINVAL;
1486
1487 out_nomem:
1488 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1489 return -ENOMEM;
1490
1491 out_hostname:
1492 dfprintk(MOUNT, "NFS: server hostname too long\n");
1493 return -ENAMETOOLONG;
1494
1495 out_path:
1496 dfprintk(MOUNT, "NFS: export pathname too long\n");
1497 return -ENAMETOOLONG;
1498 }
1499
1500 /*
1501 * Hostname has square brackets around it because it contains one or
1502 * more colons. We look for the first closing square bracket, and a
1503 * colon must follow it.
1504 */
1505 static int nfs_parse_protected_hostname(const char *dev_name,
1506 char **hostname, size_t maxnamlen,
1507 char **export_path, size_t maxpathlen)
1508 {
1509 size_t len;
1510 char *start, *end;
1511
1512 start = (char *)(dev_name + 1);
1513
1514 end = strchr(start, ']');
1515 if (end == NULL)
1516 goto out_bad_devname;
1517 if (*(end + 1) != ':')
1518 goto out_bad_devname;
1519
1520 len = end - start;
1521 if (len > maxnamlen)
1522 goto out_hostname;
1523
1524 /* N.B. caller will free nfs_server.hostname in all cases */
1525 *hostname = kstrndup(start, len, GFP_KERNEL);
1526 if (*hostname == NULL)
1527 goto out_nomem;
1528
1529 end += 2;
1530 len = strlen(end);
1531 if (len > maxpathlen)
1532 goto out_path;
1533 *export_path = kstrndup(end, len, GFP_KERNEL);
1534 if (!*export_path)
1535 goto out_nomem;
1536
1537 return 0;
1538
1539 out_bad_devname:
1540 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1541 return -EINVAL;
1542
1543 out_nomem:
1544 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1545 return -ENOMEM;
1546
1547 out_hostname:
1548 dfprintk(MOUNT, "NFS: server hostname too long\n");
1549 return -ENAMETOOLONG;
1550
1551 out_path:
1552 dfprintk(MOUNT, "NFS: export pathname too long\n");
1553 return -ENAMETOOLONG;
1554 }
1555
1556 /*
1557 * Split "dev_name" into "hostname:export_path".
1558 *
1559 * The leftmost colon demarks the split between the server's hostname
1560 * and the export path. If the hostname starts with a left square
1561 * bracket, then it may contain colons.
1562 *
1563 * Note: caller frees hostname and export path, even on error.
1564 */
1565 static int nfs_parse_devname(const char *dev_name,
1566 char **hostname, size_t maxnamlen,
1567 char **export_path, size_t maxpathlen)
1568 {
1569 if (*dev_name == '[')
1570 return nfs_parse_protected_hostname(dev_name,
1571 hostname, maxnamlen,
1572 export_path, maxpathlen);
1573
1574 return nfs_parse_simple_hostname(dev_name,
1575 hostname, maxnamlen,
1576 export_path, maxpathlen);
1577 }
1578
1579 /*
1580 * Validate the NFS2/NFS3 mount data
1581 * - fills in the mount root filehandle
1582 *
1583 * For option strings, user space handles the following behaviors:
1584 *
1585 * + DNS: mapping server host name to IP address ("addr=" option)
1586 *
1587 * + failure mode: how to behave if a mount request can't be handled
1588 * immediately ("fg/bg" option)
1589 *
1590 * + retry: how often to retry a mount request ("retry=" option)
1591 *
1592 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1593 * mountproto=tcp after mountproto=udp, and so on
1594 */
1595 static int nfs_validate_mount_data(void *options,
1596 struct nfs_parsed_mount_data *args,
1597 struct nfs_fh *mntfh,
1598 const char *dev_name)
1599 {
1600 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1601
1602 if (data == NULL)
1603 goto out_no_data;
1604
1605 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1606 args->rsize = NFS_MAX_FILE_IO_SIZE;
1607 args->wsize = NFS_MAX_FILE_IO_SIZE;
1608 args->acregmin = NFS_DEF_ACREGMIN;
1609 args->acregmax = NFS_DEF_ACREGMAX;
1610 args->acdirmin = NFS_DEF_ACDIRMIN;
1611 args->acdirmax = NFS_DEF_ACDIRMAX;
1612 args->mount_server.port = 0; /* autobind unless user sets port */
1613 args->nfs_server.port = 0; /* autobind unless user sets port */
1614 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1615 args->auth_flavors[0] = RPC_AUTH_UNIX;
1616
1617 switch (data->version) {
1618 case 1:
1619 data->namlen = 0;
1620 case 2:
1621 data->bsize = 0;
1622 case 3:
1623 if (data->flags & NFS_MOUNT_VER3)
1624 goto out_no_v3;
1625 data->root.size = NFS2_FHSIZE;
1626 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1627 case 4:
1628 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1629 goto out_no_sec;
1630 case 5:
1631 memset(data->context, 0, sizeof(data->context));
1632 case 6:
1633 if (data->flags & NFS_MOUNT_VER3) {
1634 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1635 goto out_invalid_fh;
1636 mntfh->size = data->root.size;
1637 } else
1638 mntfh->size = NFS2_FHSIZE;
1639
1640
1641 memcpy(mntfh->data, data->root.data, mntfh->size);
1642 if (mntfh->size < sizeof(mntfh->data))
1643 memset(mntfh->data + mntfh->size, 0,
1644 sizeof(mntfh->data) - mntfh->size);
1645
1646 /*
1647 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1648 * can deal with.
1649 */
1650 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1651 args->rsize = data->rsize;
1652 args->wsize = data->wsize;
1653 args->timeo = data->timeo;
1654 args->retrans = data->retrans;
1655 args->acregmin = data->acregmin;
1656 args->acregmax = data->acregmax;
1657 args->acdirmin = data->acdirmin;
1658 args->acdirmax = data->acdirmax;
1659
1660 memcpy(&args->nfs_server.address, &data->addr,
1661 sizeof(data->addr));
1662 args->nfs_server.addrlen = sizeof(data->addr);
1663 if (!nfs_verify_server_address((struct sockaddr *)
1664 &args->nfs_server.address))
1665 goto out_no_address;
1666
1667 if (!(data->flags & NFS_MOUNT_TCP))
1668 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1669 /* N.B. caller will free nfs_server.hostname in all cases */
1670 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1671 args->namlen = data->namlen;
1672 args->bsize = data->bsize;
1673
1674 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1675 args->auth_flavors[0] = data->pseudoflavor;
1676 if (!args->nfs_server.hostname)
1677 goto out_nomem;
1678
1679 /*
1680 * The legacy version 6 binary mount data from userspace has a
1681 * field used only to transport selinux information into the
1682 * the kernel. To continue to support that functionality we
1683 * have a touch of selinux knowledge here in the NFS code. The
1684 * userspace code converted context=blah to just blah so we are
1685 * converting back to the full string selinux understands.
1686 */
1687 if (data->context[0]){
1688 #ifdef CONFIG_SECURITY_SELINUX
1689 int rc;
1690 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1691 if (!opts_str)
1692 return -ENOMEM;
1693 strcpy(opts_str, "context=");
1694 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1695 strcat(opts_str, &data->context[0]);
1696 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1697 kfree(opts_str);
1698 if (rc)
1699 return rc;
1700 #else
1701 return -EINVAL;
1702 #endif
1703 }
1704
1705 break;
1706 default: {
1707 int status;
1708
1709 if (nfs_parse_mount_options((char *)options, args) == 0)
1710 return -EINVAL;
1711
1712 if (!nfs_verify_server_address((struct sockaddr *)
1713 &args->nfs_server.address))
1714 goto out_no_address;
1715
1716 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1717 args->nfs_server.port);
1718
1719 nfs_set_mount_transport_protocol(args);
1720
1721 status = nfs_parse_devname(dev_name,
1722 &args->nfs_server.hostname,
1723 PAGE_SIZE,
1724 &args->nfs_server.export_path,
1725 NFS_MAXPATHLEN);
1726 if (!status)
1727 status = nfs_try_mount(args, mntfh);
1728
1729 kfree(args->nfs_server.export_path);
1730 args->nfs_server.export_path = NULL;
1731
1732 if (status)
1733 return status;
1734
1735 break;
1736 }
1737 }
1738
1739 #ifndef CONFIG_NFS_V3
1740 if (args->flags & NFS_MOUNT_VER3)
1741 goto out_v3_not_compiled;
1742 #endif /* !CONFIG_NFS_V3 */
1743
1744 return 0;
1745
1746 out_no_data:
1747 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1748 return -EINVAL;
1749
1750 out_no_v3:
1751 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1752 data->version);
1753 return -EINVAL;
1754
1755 out_no_sec:
1756 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1757 return -EINVAL;
1758
1759 #ifndef CONFIG_NFS_V3
1760 out_v3_not_compiled:
1761 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1762 return -EPROTONOSUPPORT;
1763 #endif /* !CONFIG_NFS_V3 */
1764
1765 out_nomem:
1766 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1767 return -ENOMEM;
1768
1769 out_no_address:
1770 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1771 return -EINVAL;
1772
1773 out_invalid_fh:
1774 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1775 return -EINVAL;
1776 }
1777
1778 static int
1779 nfs_compare_remount_data(struct nfs_server *nfss,
1780 struct nfs_parsed_mount_data *data)
1781 {
1782 if (data->flags != nfss->flags ||
1783 data->rsize != nfss->rsize ||
1784 data->wsize != nfss->wsize ||
1785 data->retrans != nfss->client->cl_timeout->to_retries ||
1786 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1787 data->acregmin != nfss->acregmin / HZ ||
1788 data->acregmax != nfss->acregmax / HZ ||
1789 data->acdirmin != nfss->acdirmin / HZ ||
1790 data->acdirmax != nfss->acdirmax / HZ ||
1791 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1792 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1793 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1794 data->nfs_server.addrlen) != 0)
1795 return -EINVAL;
1796
1797 return 0;
1798 }
1799
1800 static int
1801 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1802 {
1803 int error;
1804 struct nfs_server *nfss = sb->s_fs_info;
1805 struct nfs_parsed_mount_data *data;
1806 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1807 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1808 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1809
1810 /*
1811 * Userspace mount programs that send binary options generally send
1812 * them populated with default values. We have no way to know which
1813 * ones were explicitly specified. Fall back to legacy behavior and
1814 * just return success.
1815 */
1816 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1817 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1818 options->version <= 6))))
1819 return 0;
1820
1821 data = kzalloc(sizeof(*data), GFP_KERNEL);
1822 if (data == NULL)
1823 return -ENOMEM;
1824
1825 lock_kernel();
1826 /* fill out struct with values from existing mount */
1827 data->flags = nfss->flags;
1828 data->rsize = nfss->rsize;
1829 data->wsize = nfss->wsize;
1830 data->retrans = nfss->client->cl_timeout->to_retries;
1831 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1832 data->acregmin = nfss->acregmin / HZ;
1833 data->acregmax = nfss->acregmax / HZ;
1834 data->acdirmin = nfss->acdirmin / HZ;
1835 data->acdirmax = nfss->acdirmax / HZ;
1836 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1837 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1838 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1839 data->nfs_server.addrlen);
1840
1841 /* overwrite those values with any that were specified */
1842 error = nfs_parse_mount_options((char *)options, data);
1843 if (error < 0)
1844 goto out;
1845
1846 /* compare new mount options with old ones */
1847 error = nfs_compare_remount_data(nfss, data);
1848 out:
1849 kfree(data);
1850 unlock_kernel();
1851 return error;
1852 }
1853
1854 /*
1855 * Initialise the common bits of the superblock
1856 */
1857 static inline void nfs_initialise_sb(struct super_block *sb)
1858 {
1859 struct nfs_server *server = NFS_SB(sb);
1860
1861 sb->s_magic = NFS_SUPER_MAGIC;
1862
1863 /* We probably want something more informative here */
1864 snprintf(sb->s_id, sizeof(sb->s_id),
1865 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1866
1867 if (sb->s_blocksize == 0)
1868 sb->s_blocksize = nfs_block_bits(server->wsize,
1869 &sb->s_blocksize_bits);
1870
1871 if (server->flags & NFS_MOUNT_NOAC)
1872 sb->s_flags |= MS_SYNCHRONOUS;
1873
1874 nfs_super_set_maxbytes(sb, server->maxfilesize);
1875 }
1876
1877 /*
1878 * Finish setting up an NFS2/3 superblock
1879 */
1880 static void nfs_fill_super(struct super_block *sb,
1881 struct nfs_parsed_mount_data *data)
1882 {
1883 struct nfs_server *server = NFS_SB(sb);
1884
1885 sb->s_blocksize_bits = 0;
1886 sb->s_blocksize = 0;
1887 if (data->bsize)
1888 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1889
1890 if (server->flags & NFS_MOUNT_VER3) {
1891 /* The VFS shouldn't apply the umask to mode bits. We will do
1892 * so ourselves when necessary.
1893 */
1894 sb->s_flags |= MS_POSIXACL;
1895 sb->s_time_gran = 1;
1896 }
1897
1898 sb->s_op = &nfs_sops;
1899 nfs_initialise_sb(sb);
1900 }
1901
1902 /*
1903 * Finish setting up a cloned NFS2/3 superblock
1904 */
1905 static void nfs_clone_super(struct super_block *sb,
1906 const struct super_block *old_sb)
1907 {
1908 struct nfs_server *server = NFS_SB(sb);
1909
1910 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1911 sb->s_blocksize = old_sb->s_blocksize;
1912 sb->s_maxbytes = old_sb->s_maxbytes;
1913
1914 if (server->flags & NFS_MOUNT_VER3) {
1915 /* The VFS shouldn't apply the umask to mode bits. We will do
1916 * so ourselves when necessary.
1917 */
1918 sb->s_flags |= MS_POSIXACL;
1919 sb->s_time_gran = 1;
1920 }
1921
1922 sb->s_op = old_sb->s_op;
1923 nfs_initialise_sb(sb);
1924 }
1925
1926 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1927 {
1928 const struct nfs_server *a = s->s_fs_info;
1929 const struct rpc_clnt *clnt_a = a->client;
1930 const struct rpc_clnt *clnt_b = b->client;
1931
1932 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1933 goto Ebusy;
1934 if (a->nfs_client != b->nfs_client)
1935 goto Ebusy;
1936 if (a->flags != b->flags)
1937 goto Ebusy;
1938 if (a->wsize != b->wsize)
1939 goto Ebusy;
1940 if (a->rsize != b->rsize)
1941 goto Ebusy;
1942 if (a->acregmin != b->acregmin)
1943 goto Ebusy;
1944 if (a->acregmax != b->acregmax)
1945 goto Ebusy;
1946 if (a->acdirmin != b->acdirmin)
1947 goto Ebusy;
1948 if (a->acdirmax != b->acdirmax)
1949 goto Ebusy;
1950 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1951 goto Ebusy;
1952 return 1;
1953 Ebusy:
1954 return 0;
1955 }
1956
1957 struct nfs_sb_mountdata {
1958 struct nfs_server *server;
1959 int mntflags;
1960 };
1961
1962 static int nfs_set_super(struct super_block *s, void *data)
1963 {
1964 struct nfs_sb_mountdata *sb_mntdata = data;
1965 struct nfs_server *server = sb_mntdata->server;
1966 int ret;
1967
1968 s->s_flags = sb_mntdata->mntflags;
1969 s->s_fs_info = server;
1970 ret = set_anon_super(s, server);
1971 if (ret == 0)
1972 server->s_dev = s->s_dev;
1973 return ret;
1974 }
1975
1976 static int nfs_compare_super_address(struct nfs_server *server1,
1977 struct nfs_server *server2)
1978 {
1979 struct sockaddr *sap1, *sap2;
1980
1981 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1982 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1983
1984 if (sap1->sa_family != sap2->sa_family)
1985 return 0;
1986
1987 switch (sap1->sa_family) {
1988 case AF_INET: {
1989 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1990 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1991 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1992 return 0;
1993 if (sin1->sin_port != sin2->sin_port)
1994 return 0;
1995 break;
1996 }
1997 case AF_INET6: {
1998 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1999 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2000 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2001 return 0;
2002 if (sin1->sin6_port != sin2->sin6_port)
2003 return 0;
2004 break;
2005 }
2006 default:
2007 return 0;
2008 }
2009
2010 return 1;
2011 }
2012
2013 static int nfs_compare_super(struct super_block *sb, void *data)
2014 {
2015 struct nfs_sb_mountdata *sb_mntdata = data;
2016 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2017 int mntflags = sb_mntdata->mntflags;
2018
2019 if (!nfs_compare_super_address(old, server))
2020 return 0;
2021 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2022 if (old->flags & NFS_MOUNT_UNSHARED)
2023 return 0;
2024 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2025 return 0;
2026 return nfs_compare_mount_options(sb, server, mntflags);
2027 }
2028
2029 static int nfs_bdi_register(struct nfs_server *server)
2030 {
2031 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2032 }
2033
2034 static int nfs_get_sb(struct file_system_type *fs_type,
2035 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2036 {
2037 struct nfs_server *server = NULL;
2038 struct super_block *s;
2039 struct nfs_parsed_mount_data *data;
2040 struct nfs_fh *mntfh;
2041 struct dentry *mntroot;
2042 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2043 struct nfs_sb_mountdata sb_mntdata = {
2044 .mntflags = flags,
2045 };
2046 int error = -ENOMEM;
2047
2048 data = kzalloc(sizeof(*data), GFP_KERNEL);
2049 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2050 if (data == NULL || mntfh == NULL)
2051 goto out_free_fh;
2052
2053 security_init_mnt_opts(&data->lsm_opts);
2054
2055 /* Validate the mount data */
2056 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2057 if (error < 0)
2058 goto out;
2059
2060 /* Get a volume representation */
2061 server = nfs_create_server(data, mntfh);
2062 if (IS_ERR(server)) {
2063 error = PTR_ERR(server);
2064 goto out;
2065 }
2066 sb_mntdata.server = server;
2067
2068 if (server->flags & NFS_MOUNT_UNSHARED)
2069 compare_super = NULL;
2070
2071 /* Get a superblock - note that we may end up sharing one that already exists */
2072 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2073 if (IS_ERR(s)) {
2074 error = PTR_ERR(s);
2075 goto out_err_nosb;
2076 }
2077
2078 if (s->s_fs_info != server) {
2079 nfs_free_server(server);
2080 server = NULL;
2081 } else {
2082 error = nfs_bdi_register(server);
2083 if (error)
2084 goto error_splat_super;
2085 }
2086
2087 if (!s->s_root) {
2088 /* initial superblock/root creation */
2089 nfs_fill_super(s, data);
2090 nfs_fscache_get_super_cookie(s, data);
2091 }
2092
2093 mntroot = nfs_get_root(s, mntfh);
2094 if (IS_ERR(mntroot)) {
2095 error = PTR_ERR(mntroot);
2096 goto error_splat_super;
2097 }
2098
2099 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2100 if (error)
2101 goto error_splat_root;
2102
2103 s->s_flags |= MS_ACTIVE;
2104 mnt->mnt_sb = s;
2105 mnt->mnt_root = mntroot;
2106 error = 0;
2107
2108 out:
2109 kfree(data->nfs_server.hostname);
2110 kfree(data->mount_server.hostname);
2111 kfree(data->fscache_uniq);
2112 security_free_mnt_opts(&data->lsm_opts);
2113 out_free_fh:
2114 kfree(mntfh);
2115 kfree(data);
2116 return error;
2117
2118 out_err_nosb:
2119 nfs_free_server(server);
2120 goto out;
2121
2122 error_splat_root:
2123 dput(mntroot);
2124 error_splat_super:
2125 deactivate_locked_super(s);
2126 goto out;
2127 }
2128
2129 /*
2130 * Destroy an NFS2/3 superblock
2131 */
2132 static void nfs_kill_super(struct super_block *s)
2133 {
2134 struct nfs_server *server = NFS_SB(s);
2135
2136 bdi_unregister(&server->backing_dev_info);
2137 kill_anon_super(s);
2138 nfs_fscache_release_super_cookie(s);
2139 nfs_free_server(server);
2140 }
2141
2142 /*
2143 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2144 */
2145 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2146 const char *dev_name, void *raw_data,
2147 struct vfsmount *mnt)
2148 {
2149 struct nfs_clone_mount *data = raw_data;
2150 struct super_block *s;
2151 struct nfs_server *server;
2152 struct dentry *mntroot;
2153 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2154 struct nfs_sb_mountdata sb_mntdata = {
2155 .mntflags = flags,
2156 };
2157 int error;
2158
2159 dprintk("--> nfs_xdev_get_sb()\n");
2160
2161 /* create a new volume representation */
2162 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2163 if (IS_ERR(server)) {
2164 error = PTR_ERR(server);
2165 goto out_err_noserver;
2166 }
2167 sb_mntdata.server = server;
2168
2169 if (server->flags & NFS_MOUNT_UNSHARED)
2170 compare_super = NULL;
2171
2172 /* Get a superblock - note that we may end up sharing one that already exists */
2173 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2174 if (IS_ERR(s)) {
2175 error = PTR_ERR(s);
2176 goto out_err_nosb;
2177 }
2178
2179 if (s->s_fs_info != server) {
2180 nfs_free_server(server);
2181 server = NULL;
2182 } else {
2183 error = nfs_bdi_register(server);
2184 if (error)
2185 goto error_splat_super;
2186 }
2187
2188 if (!s->s_root) {
2189 /* initial superblock/root creation */
2190 nfs_clone_super(s, data->sb);
2191 }
2192
2193 mntroot = nfs_get_root(s, data->fh);
2194 if (IS_ERR(mntroot)) {
2195 error = PTR_ERR(mntroot);
2196 goto error_splat_super;
2197 }
2198 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2199 dput(mntroot);
2200 error = -ESTALE;
2201 goto error_splat_super;
2202 }
2203
2204 s->s_flags |= MS_ACTIVE;
2205 mnt->mnt_sb = s;
2206 mnt->mnt_root = mntroot;
2207
2208 /* clone any lsm security options from the parent to the new sb */
2209 security_sb_clone_mnt_opts(data->sb, s);
2210
2211 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2212 return 0;
2213
2214 out_err_nosb:
2215 nfs_free_server(server);
2216 out_err_noserver:
2217 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2218 return error;
2219
2220 error_splat_super:
2221 deactivate_locked_super(s);
2222 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2223 return error;
2224 }
2225
2226 #ifdef CONFIG_NFS_V4
2227
2228 /*
2229 * Finish setting up a cloned NFS4 superblock
2230 */
2231 static void nfs4_clone_super(struct super_block *sb,
2232 const struct super_block *old_sb)
2233 {
2234 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2235 sb->s_blocksize = old_sb->s_blocksize;
2236 sb->s_maxbytes = old_sb->s_maxbytes;
2237 sb->s_time_gran = 1;
2238 sb->s_op = old_sb->s_op;
2239 nfs_initialise_sb(sb);
2240 }
2241
2242 /*
2243 * Set up an NFS4 superblock
2244 */
2245 static void nfs4_fill_super(struct super_block *sb)
2246 {
2247 sb->s_time_gran = 1;
2248 sb->s_op = &nfs4_sops;
2249 nfs_initialise_sb(sb);
2250 }
2251
2252 /*
2253 * Validate NFSv4 mount options
2254 */
2255 static int nfs4_validate_mount_data(void *options,
2256 struct nfs_parsed_mount_data *args,
2257 const char *dev_name)
2258 {
2259 struct sockaddr_in *ap;
2260 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2261 char *c;
2262
2263 if (data == NULL)
2264 goto out_no_data;
2265
2266 args->rsize = NFS_MAX_FILE_IO_SIZE;
2267 args->wsize = NFS_MAX_FILE_IO_SIZE;
2268 args->acregmin = NFS_DEF_ACREGMIN;
2269 args->acregmax = NFS_DEF_ACREGMAX;
2270 args->acdirmin = NFS_DEF_ACDIRMIN;
2271 args->acdirmax = NFS_DEF_ACDIRMAX;
2272 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2273 args->auth_flavors[0] = RPC_AUTH_UNIX;
2274 args->auth_flavor_len = 0;
2275 args->minorversion = 0;
2276
2277 switch (data->version) {
2278 case 1:
2279 ap = (struct sockaddr_in *)&args->nfs_server.address;
2280 if (data->host_addrlen > sizeof(args->nfs_server.address))
2281 goto out_no_address;
2282 if (data->host_addrlen == 0)
2283 goto out_no_address;
2284 args->nfs_server.addrlen = data->host_addrlen;
2285 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2286 return -EFAULT;
2287 if (!nfs_verify_server_address((struct sockaddr *)
2288 &args->nfs_server.address))
2289 goto out_no_address;
2290
2291 if (data->auth_flavourlen) {
2292 if (data->auth_flavourlen > 1)
2293 goto out_inval_auth;
2294 if (copy_from_user(&args->auth_flavors[0],
2295 data->auth_flavours,
2296 sizeof(args->auth_flavors[0])))
2297 return -EFAULT;
2298 }
2299
2300 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2301 if (IS_ERR(c))
2302 return PTR_ERR(c);
2303 args->nfs_server.hostname = c;
2304
2305 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2306 if (IS_ERR(c))
2307 return PTR_ERR(c);
2308 args->nfs_server.export_path = c;
2309 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2310
2311 c = strndup_user(data->client_addr.data, 16);
2312 if (IS_ERR(c))
2313 return PTR_ERR(c);
2314 args->client_address = c;
2315
2316 /*
2317 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2318 * can deal with.
2319 */
2320
2321 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2322 args->rsize = data->rsize;
2323 args->wsize = data->wsize;
2324 args->timeo = data->timeo;
2325 args->retrans = data->retrans;
2326 args->acregmin = data->acregmin;
2327 args->acregmax = data->acregmax;
2328 args->acdirmin = data->acdirmin;
2329 args->acdirmax = data->acdirmax;
2330 args->nfs_server.protocol = data->proto;
2331 nfs_validate_transport_protocol(args);
2332
2333 break;
2334 default: {
2335 int status;
2336
2337 if (nfs_parse_mount_options((char *)options, args) == 0)
2338 return -EINVAL;
2339
2340 if (!nfs_verify_server_address((struct sockaddr *)
2341 &args->nfs_server.address))
2342 return -EINVAL;
2343
2344 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2345 args->nfs_server.port);
2346
2347 nfs_validate_transport_protocol(args);
2348
2349 if (args->auth_flavor_len > 1)
2350 goto out_inval_auth;
2351
2352 if (args->client_address == NULL)
2353 goto out_no_client_address;
2354
2355 status = nfs_parse_devname(dev_name,
2356 &args->nfs_server.hostname,
2357 NFS4_MAXNAMLEN,
2358 &args->nfs_server.export_path,
2359 NFS4_MAXPATHLEN);
2360 if (status < 0)
2361 return status;
2362
2363 break;
2364 }
2365 }
2366
2367 return 0;
2368
2369 out_no_data:
2370 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2371 return -EINVAL;
2372
2373 out_inval_auth:
2374 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2375 data->auth_flavourlen);
2376 return -EINVAL;
2377
2378 out_no_address:
2379 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2380 return -EINVAL;
2381
2382 out_no_client_address:
2383 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2384 return -EINVAL;
2385 }
2386
2387 /*
2388 * Get the superblock for an NFS4 mountpoint
2389 */
2390 static int nfs4_get_sb(struct file_system_type *fs_type,
2391 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2392 {
2393 struct nfs_parsed_mount_data *data;
2394 struct super_block *s;
2395 struct nfs_server *server;
2396 struct nfs_fh *mntfh;
2397 struct dentry *mntroot;
2398 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2399 struct nfs_sb_mountdata sb_mntdata = {
2400 .mntflags = flags,
2401 };
2402 int error = -ENOMEM;
2403
2404 data = kzalloc(sizeof(*data), GFP_KERNEL);
2405 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2406 if (data == NULL || mntfh == NULL)
2407 goto out_free_fh;
2408
2409 security_init_mnt_opts(&data->lsm_opts);
2410
2411 /* Validate the mount data */
2412 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2413 if (error < 0)
2414 goto out;
2415
2416 /* Get a volume representation */
2417 server = nfs4_create_server(data, mntfh);
2418 if (IS_ERR(server)) {
2419 error = PTR_ERR(server);
2420 goto out;
2421 }
2422 sb_mntdata.server = server;
2423
2424 if (server->flags & NFS4_MOUNT_UNSHARED)
2425 compare_super = NULL;
2426
2427 /* Get a superblock - note that we may end up sharing one that already exists */
2428 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2429 if (IS_ERR(s)) {
2430 error = PTR_ERR(s);
2431 goto out_free;
2432 }
2433
2434 if (s->s_fs_info != server) {
2435 nfs_free_server(server);
2436 server = NULL;
2437 } else {
2438 error = nfs_bdi_register(server);
2439 if (error)
2440 goto error_splat_super;
2441 }
2442
2443 if (!s->s_root) {
2444 /* initial superblock/root creation */
2445 nfs4_fill_super(s);
2446 nfs_fscache_get_super_cookie(s, data);
2447 }
2448
2449 mntroot = nfs4_get_root(s, mntfh);
2450 if (IS_ERR(mntroot)) {
2451 error = PTR_ERR(mntroot);
2452 goto error_splat_super;
2453 }
2454
2455 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2456 if (error)
2457 goto error_splat_root;
2458
2459 s->s_flags |= MS_ACTIVE;
2460 mnt->mnt_sb = s;
2461 mnt->mnt_root = mntroot;
2462 error = 0;
2463
2464 out:
2465 kfree(data->client_address);
2466 kfree(data->nfs_server.export_path);
2467 kfree(data->nfs_server.hostname);
2468 kfree(data->fscache_uniq);
2469 security_free_mnt_opts(&data->lsm_opts);
2470 out_free_fh:
2471 kfree(mntfh);
2472 kfree(data);
2473 return error;
2474
2475 out_free:
2476 nfs_free_server(server);
2477 goto out;
2478
2479 error_splat_root:
2480 dput(mntroot);
2481 error_splat_super:
2482 deactivate_locked_super(s);
2483 goto out;
2484 }
2485
2486 static void nfs4_kill_super(struct super_block *sb)
2487 {
2488 struct nfs_server *server = NFS_SB(sb);
2489
2490 dprintk("--> %s\n", __func__);
2491 nfs_super_return_all_delegations(sb);
2492 kill_anon_super(sb);
2493 nfs4_renewd_prepare_shutdown(server);
2494 nfs_fscache_release_super_cookie(sb);
2495 nfs_free_server(server);
2496 dprintk("<-- %s\n", __func__);
2497 }
2498
2499 /*
2500 * Clone an NFS4 server record on xdev traversal (FSID-change)
2501 */
2502 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2503 const char *dev_name, void *raw_data,
2504 struct vfsmount *mnt)
2505 {
2506 struct nfs_clone_mount *data = raw_data;
2507 struct super_block *s;
2508 struct nfs_server *server;
2509 struct dentry *mntroot;
2510 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2511 struct nfs_sb_mountdata sb_mntdata = {
2512 .mntflags = flags,
2513 };
2514 int error;
2515
2516 dprintk("--> nfs4_xdev_get_sb()\n");
2517
2518 /* create a new volume representation */
2519 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2520 if (IS_ERR(server)) {
2521 error = PTR_ERR(server);
2522 goto out_err_noserver;
2523 }
2524 sb_mntdata.server = server;
2525
2526 if (server->flags & NFS4_MOUNT_UNSHARED)
2527 compare_super = NULL;
2528
2529 /* Get a superblock - note that we may end up sharing one that already exists */
2530 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2531 if (IS_ERR(s)) {
2532 error = PTR_ERR(s);
2533 goto out_err_nosb;
2534 }
2535
2536 if (s->s_fs_info != server) {
2537 nfs_free_server(server);
2538 server = NULL;
2539 } else {
2540 error = nfs_bdi_register(server);
2541 if (error)
2542 goto error_splat_super;
2543 }
2544
2545 if (!s->s_root) {
2546 /* initial superblock/root creation */
2547 nfs4_clone_super(s, data->sb);
2548 }
2549
2550 mntroot = nfs4_get_root(s, data->fh);
2551 if (IS_ERR(mntroot)) {
2552 error = PTR_ERR(mntroot);
2553 goto error_splat_super;
2554 }
2555 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2556 dput(mntroot);
2557 error = -ESTALE;
2558 goto error_splat_super;
2559 }
2560
2561 s->s_flags |= MS_ACTIVE;
2562 mnt->mnt_sb = s;
2563 mnt->mnt_root = mntroot;
2564
2565 security_sb_clone_mnt_opts(data->sb, s);
2566
2567 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2568 return 0;
2569
2570 out_err_nosb:
2571 nfs_free_server(server);
2572 out_err_noserver:
2573 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2574 return error;
2575
2576 error_splat_super:
2577 deactivate_locked_super(s);
2578 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2579 return error;
2580 }
2581
2582 /*
2583 * Create an NFS4 server record on referral traversal
2584 */
2585 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2586 const char *dev_name, void *raw_data,
2587 struct vfsmount *mnt)
2588 {
2589 struct nfs_clone_mount *data = raw_data;
2590 struct super_block *s;
2591 struct nfs_server *server;
2592 struct dentry *mntroot;
2593 struct nfs_fh mntfh;
2594 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2595 struct nfs_sb_mountdata sb_mntdata = {
2596 .mntflags = flags,
2597 };
2598 int error;
2599
2600 dprintk("--> nfs4_referral_get_sb()\n");
2601
2602 /* create a new volume representation */
2603 server = nfs4_create_referral_server(data, &mntfh);
2604 if (IS_ERR(server)) {
2605 error = PTR_ERR(server);
2606 goto out_err_noserver;
2607 }
2608 sb_mntdata.server = server;
2609
2610 if (server->flags & NFS4_MOUNT_UNSHARED)
2611 compare_super = NULL;
2612
2613 /* Get a superblock - note that we may end up sharing one that already exists */
2614 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2615 if (IS_ERR(s)) {
2616 error = PTR_ERR(s);
2617 goto out_err_nosb;
2618 }
2619
2620 if (s->s_fs_info != server) {
2621 nfs_free_server(server);
2622 server = NULL;
2623 } else {
2624 error = nfs_bdi_register(server);
2625 if (error)
2626 goto error_splat_super;
2627 }
2628
2629 if (!s->s_root) {
2630 /* initial superblock/root creation */
2631 nfs4_fill_super(s);
2632 }
2633
2634 mntroot = nfs4_get_root(s, &mntfh);
2635 if (IS_ERR(mntroot)) {
2636 error = PTR_ERR(mntroot);
2637 goto error_splat_super;
2638 }
2639 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2640 dput(mntroot);
2641 error = -ESTALE;
2642 goto error_splat_super;
2643 }
2644
2645 s->s_flags |= MS_ACTIVE;
2646 mnt->mnt_sb = s;
2647 mnt->mnt_root = mntroot;
2648
2649 security_sb_clone_mnt_opts(data->sb, s);
2650
2651 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2652 return 0;
2653
2654 out_err_nosb:
2655 nfs_free_server(server);
2656 out_err_noserver:
2657 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2658 return error;
2659
2660 error_splat_super:
2661 deactivate_locked_super(s);
2662 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2663 return error;
2664 }
2665
2666 #endif /* CONFIG_NFS_V4 */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree