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init from v2.6.32.60
[mach-moxart.git] / fs / nfs / super.c
blob9a3f15bb7b37aac49a439b466314ae4bcb449b40
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, Opt_v4,
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_v4, "v4" },
131 { Opt_udp, "udp" },
132 { Opt_tcp, "tcp" },
133 { Opt_rdma, "rdma" },
134 { Opt_acl, "acl" },
135 { Opt_noacl, "noacl" },
136 { Opt_rdirplus, "rdirplus" },
137 { Opt_nordirplus, "nordirplus" },
138 { Opt_sharecache, "sharecache" },
139 { Opt_nosharecache, "nosharecache" },
140 { Opt_resvport, "resvport" },
141 { Opt_noresvport, "noresvport" },
142 { Opt_fscache, "fsc" },
143 { Opt_fscache_uniq, "fsc=%s" },
144 { Opt_nofscache, "nofsc" },
145
146 { Opt_port, "port=%s" },
147 { Opt_rsize, "rsize=%s" },
148 { Opt_wsize, "wsize=%s" },
149 { Opt_bsize, "bsize=%s" },
150 { Opt_timeo, "timeo=%s" },
151 { Opt_retrans, "retrans=%s" },
152 { Opt_acregmin, "acregmin=%s" },
153 { Opt_acregmax, "acregmax=%s" },
154 { Opt_acdirmin, "acdirmin=%s" },
155 { Opt_acdirmax, "acdirmax=%s" },
156 { Opt_actimeo, "actimeo=%s" },
157 { Opt_namelen, "namlen=%s" },
158 { Opt_mountport, "mountport=%s" },
159 { Opt_mountvers, "mountvers=%s" },
160 { Opt_nfsvers, "nfsvers=%s" },
161 { Opt_nfsvers, "vers=%s" },
162 { Opt_minorversion, "minorversion=%s" },
163
164 { Opt_sec, "sec=%s" },
165 { Opt_proto, "proto=%s" },
166 { Opt_mountproto, "mountproto=%s" },
167 { Opt_addr, "addr=%s" },
168 { Opt_clientaddr, "clientaddr=%s" },
169 { Opt_mounthost, "mounthost=%s" },
170 { Opt_mountaddr, "mountaddr=%s" },
171
172 { Opt_lookupcache, "lookupcache=%s" },
173
174 { Opt_err, NULL }
175 };
176
177 enum {
178 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
179
180 Opt_xprt_err
181 };
182
183 static const match_table_t nfs_xprt_protocol_tokens = {
184 { Opt_xprt_udp, "udp" },
185 { Opt_xprt_tcp, "tcp" },
186 { Opt_xprt_rdma, "rdma" },
187
188 { Opt_xprt_err, NULL }
189 };
190
191 enum {
192 Opt_sec_none, Opt_sec_sys,
193 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
194 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
195 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
196
197 Opt_sec_err
198 };
199
200 static const match_table_t nfs_secflavor_tokens = {
201 { Opt_sec_none, "none" },
202 { Opt_sec_none, "null" },
203 { Opt_sec_sys, "sys" },
204
205 { Opt_sec_krb5, "krb5" },
206 { Opt_sec_krb5i, "krb5i" },
207 { Opt_sec_krb5p, "krb5p" },
208
209 { Opt_sec_lkey, "lkey" },
210 { Opt_sec_lkeyi, "lkeyi" },
211 { Opt_sec_lkeyp, "lkeyp" },
212
213 { Opt_sec_spkm, "spkm3" },
214 { Opt_sec_spkmi, "spkm3i" },
215 { Opt_sec_spkmp, "spkm3p" },
216
217 { Opt_sec_err, NULL }
218 };
219
220 enum {
221 Opt_lookupcache_all, Opt_lookupcache_positive,
222 Opt_lookupcache_none,
223
224 Opt_lookupcache_err
225 };
226
227 static match_table_t nfs_lookupcache_tokens = {
228 { Opt_lookupcache_all, "all" },
229 { Opt_lookupcache_positive, "pos" },
230 { Opt_lookupcache_positive, "positive" },
231 { Opt_lookupcache_none, "none" },
232
233 { Opt_lookupcache_err, NULL }
234 };
235
236
237 static void nfs_umount_begin(struct super_block *);
238 static int nfs_statfs(struct dentry *, struct kstatfs *);
239 static int nfs_show_options(struct seq_file *, struct vfsmount *);
240 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
241 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
242 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244 static void nfs_put_super(struct super_block *);
245 static void nfs_kill_super(struct super_block *);
246 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
247
248 static struct file_system_type nfs_fs_type = {
249 .owner = THIS_MODULE,
250 .name = "nfs",
251 .get_sb = nfs_get_sb,
252 .kill_sb = nfs_kill_super,
253 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
254 };
255
256 struct file_system_type nfs_xdev_fs_type = {
257 .owner = THIS_MODULE,
258 .name = "nfs",
259 .get_sb = nfs_xdev_get_sb,
260 .kill_sb = nfs_kill_super,
261 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
262 };
263
264 static const struct super_operations nfs_sops = {
265 .alloc_inode = nfs_alloc_inode,
266 .destroy_inode = nfs_destroy_inode,
267 .write_inode = nfs_write_inode,
268 .put_super = nfs_put_super,
269 .statfs = nfs_statfs,
270 .clear_inode = nfs_clear_inode,
271 .umount_begin = nfs_umount_begin,
272 .show_options = nfs_show_options,
273 .show_stats = nfs_show_stats,
274 .remount_fs = nfs_remount,
275 };
276
277 #ifdef CONFIG_NFS_V4
278 static int nfs4_validate_text_mount_data(void *options,
279 struct nfs_parsed_mount_data *args, const char *dev_name);
280 static int nfs4_try_mount(int flags, const char *dev_name,
281 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
282 static int nfs4_get_sb(struct file_system_type *fs_type,
283 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
284 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
285 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
286 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
287 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
288 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
290 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
291 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
292 static void nfs4_kill_super(struct super_block *sb);
293
294 static struct file_system_type nfs4_fs_type = {
295 .owner = THIS_MODULE,
296 .name = "nfs4",
297 .get_sb = nfs4_get_sb,
298 .kill_sb = nfs4_kill_super,
299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
300 };
301
302 static struct file_system_type nfs4_remote_fs_type = {
303 .owner = THIS_MODULE,
304 .name = "nfs4",
305 .get_sb = nfs4_remote_get_sb,
306 .kill_sb = nfs4_kill_super,
307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
308 };
309
310 struct file_system_type nfs4_xdev_fs_type = {
311 .owner = THIS_MODULE,
312 .name = "nfs4",
313 .get_sb = nfs4_xdev_get_sb,
314 .kill_sb = nfs4_kill_super,
315 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
316 };
317
318 static struct file_system_type nfs4_remote_referral_fs_type = {
319 .owner = THIS_MODULE,
320 .name = "nfs4",
321 .get_sb = nfs4_remote_referral_get_sb,
322 .kill_sb = nfs4_kill_super,
323 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
324 };
325
326 struct file_system_type nfs4_referral_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "nfs4",
329 .get_sb = nfs4_referral_get_sb,
330 .kill_sb = nfs4_kill_super,
331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
332 };
333
334 static const struct super_operations nfs4_sops = {
335 .alloc_inode = nfs_alloc_inode,
336 .destroy_inode = nfs_destroy_inode,
337 .write_inode = nfs_write_inode,
338 .put_super = nfs_put_super,
339 .statfs = nfs_statfs,
340 .clear_inode = nfs4_clear_inode,
341 .umount_begin = nfs_umount_begin,
342 .show_options = nfs_show_options,
343 .show_stats = nfs_show_stats,
344 .remount_fs = nfs_remount,
345 };
346 #endif
347
348 static struct shrinker acl_shrinker = {
349 .shrink = nfs_access_cache_shrinker,
350 .seeks = DEFAULT_SEEKS,
351 };
352
353 /*
354 * Register the NFS filesystems
355 */
356 int __init register_nfs_fs(void)
357 {
358 int ret;
359
360 ret = register_filesystem(&nfs_fs_type);
361 if (ret < 0)
362 goto error_0;
363
364 ret = nfs_register_sysctl();
365 if (ret < 0)
366 goto error_1;
367 #ifdef CONFIG_NFS_V4
368 ret = register_filesystem(&nfs4_fs_type);
369 if (ret < 0)
370 goto error_2;
371 #endif
372 register_shrinker(&acl_shrinker);
373 return 0;
374
375 #ifdef CONFIG_NFS_V4
376 error_2:
377 nfs_unregister_sysctl();
378 #endif
379 error_1:
380 unregister_filesystem(&nfs_fs_type);
381 error_0:
382 return ret;
383 }
384
385 /*
386 * Unregister the NFS filesystems
387 */
388 void __exit unregister_nfs_fs(void)
389 {
390 unregister_shrinker(&acl_shrinker);
391 #ifdef CONFIG_NFS_V4
392 unregister_filesystem(&nfs4_fs_type);
393 #endif
394 nfs_unregister_sysctl();
395 unregister_filesystem(&nfs_fs_type);
396 }
397
398 void nfs_sb_active(struct super_block *sb)
399 {
400 struct nfs_server *server = NFS_SB(sb);
401
402 if (atomic_inc_return(&server->active) == 1)
403 atomic_inc(&sb->s_active);
404 }
405
406 void nfs_sb_deactive(struct super_block *sb)
407 {
408 struct nfs_server *server = NFS_SB(sb);
409
410 if (atomic_dec_and_test(&server->active))
411 deactivate_super(sb);
412 }
413
414 /*
415 * Deliver file system statistics to userspace
416 */
417 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
418 {
419 struct nfs_server *server = NFS_SB(dentry->d_sb);
420 unsigned char blockbits;
421 unsigned long blockres;
422 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
423 struct nfs_fattr fattr;
424 struct nfs_fsstat res = {
425 .fattr = &fattr,
426 };
427 int error;
428
429 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
430 if (error < 0)
431 goto out_err;
432 buf->f_type = NFS_SUPER_MAGIC;
433
434 /*
435 * Current versions of glibc do not correctly handle the
436 * case where f_frsize != f_bsize. Eventually we want to
437 * report the value of wtmult in this field.
438 */
439 buf->f_frsize = dentry->d_sb->s_blocksize;
440
441 /*
442 * On most *nix systems, f_blocks, f_bfree, and f_bavail
443 * are reported in units of f_frsize. Linux hasn't had
444 * an f_frsize field in its statfs struct until recently,
445 * thus historically Linux's sys_statfs reports these
446 * fields in units of f_bsize.
447 */
448 buf->f_bsize = dentry->d_sb->s_blocksize;
449 blockbits = dentry->d_sb->s_blocksize_bits;
450 blockres = (1 << blockbits) - 1;
451 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
452 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
453 buf->f_bavail = (res.abytes + blockres) >> blockbits;
454
455 buf->f_files = res.tfiles;
456 buf->f_ffree = res.afiles;
457
458 buf->f_namelen = server->namelen;
459
460 return 0;
461
462 out_err:
463 dprintk("%s: statfs error = %d\n", __func__, -error);
464 return error;
465 }
466
467 /*
468 * Map the security flavour number to a name
469 */
470 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
471 {
472 static const struct {
473 rpc_authflavor_t flavour;
474 const char *str;
475 } sec_flavours[] = {
476 { RPC_AUTH_NULL, "null" },
477 { RPC_AUTH_UNIX, "sys" },
478 { RPC_AUTH_GSS_KRB5, "krb5" },
479 { RPC_AUTH_GSS_KRB5I, "krb5i" },
480 { RPC_AUTH_GSS_KRB5P, "krb5p" },
481 { RPC_AUTH_GSS_LKEY, "lkey" },
482 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
483 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
484 { RPC_AUTH_GSS_SPKM, "spkm" },
485 { RPC_AUTH_GSS_SPKMI, "spkmi" },
486 { RPC_AUTH_GSS_SPKMP, "spkmp" },
487 { UINT_MAX, "unknown" }
488 };
489 int i;
490
491 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
492 if (sec_flavours[i].flavour == flavour)
493 break;
494 }
495 return sec_flavours[i].str;
496 }
497
498 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
499 int showdefaults)
500 {
501 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
502
503 switch (sap->sa_family) {
504 case AF_INET: {
505 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
506 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
507 break;
508 }
509 case AF_INET6: {
510 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
511 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
512 break;
513 }
514 default:
515 if (showdefaults)
516 seq_printf(m, ",mountaddr=unspecified");
517 }
518
519 if (nfss->mountd_version || showdefaults)
520 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
521 if (nfss->mountd_port || showdefaults)
522 seq_printf(m, ",mountport=%u", nfss->mountd_port);
523
524 switch (nfss->mountd_protocol) {
525 case IPPROTO_UDP:
526 seq_printf(m, ",mountproto=udp");
527 break;
528 case IPPROTO_TCP:
529 seq_printf(m, ",mountproto=tcp");
530 break;
531 default:
532 if (showdefaults)
533 seq_printf(m, ",mountproto=auto");
534 }
535 }
536
537 #ifdef CONFIG_NFS_V4
538 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
539 int showdefaults)
540 {
541 struct nfs_client *clp = nfss->nfs_client;
542
543 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
544 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
545 }
546 #else
547 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
548 int showdefaults)
549 {
550 }
551 #endif
552
553 /*
554 * Describe the mount options in force on this server representation
555 */
556 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
557 int showdefaults)
558 {
559 static const struct proc_nfs_info {
560 int flag;
561 const char *str;
562 const char *nostr;
563 } nfs_info[] = {
564 { NFS_MOUNT_SOFT, ",soft", ",hard" },
565 { NFS_MOUNT_POSIX, ",posix", "" },
566 { NFS_MOUNT_NOCTO, ",nocto", "" },
567 { NFS_MOUNT_NOAC, ",noac", "" },
568 { NFS_MOUNT_NONLM, ",nolock", "" },
569 { NFS_MOUNT_NOACL, ",noacl", "" },
570 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
571 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
572 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
573 { 0, NULL, NULL }
574 };
575 const struct proc_nfs_info *nfs_infop;
576 struct nfs_client *clp = nfss->nfs_client;
577 u32 version = clp->rpc_ops->version;
578
579 seq_printf(m, ",vers=%u", version);
580 seq_printf(m, ",rsize=%u", nfss->rsize);
581 seq_printf(m, ",wsize=%u", nfss->wsize);
582 if (nfss->bsize != 0)
583 seq_printf(m, ",bsize=%u", nfss->bsize);
584 seq_printf(m, ",namlen=%u", nfss->namelen);
585 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
586 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
587 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
588 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
589 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
590 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
591 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
592 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
593 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
594 if (nfss->flags & nfs_infop->flag)
595 seq_puts(m, nfs_infop->str);
596 else
597 seq_puts(m, nfs_infop->nostr);
598 }
599 seq_printf(m, ",proto=%s",
600 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
601 if (version == 4) {
602 if (nfss->port != NFS_PORT)
603 seq_printf(m, ",port=%u", nfss->port);
604 } else
605 if (nfss->port)
606 seq_printf(m, ",port=%u", nfss->port);
607
608 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
609 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
610 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
611
612 if (version != 4)
613 nfs_show_mountd_options(m, nfss, showdefaults);
614 else
615 nfs_show_nfsv4_options(m, nfss, showdefaults);
616
617 if (nfss->options & NFS_OPTION_FSCACHE)
618 seq_printf(m, ",fsc");
619
620 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
621 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
622 seq_printf(m, ",lookupcache=none");
623 else
624 seq_printf(m, ",lookupcache=pos");
625 }
626 }
627
628 /*
629 * Describe the mount options on this VFS mountpoint
630 */
631 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
632 {
633 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
634
635 nfs_show_mount_options(m, nfss, 0);
636
637 seq_printf(m, ",addr=%s",
638 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
639 RPC_DISPLAY_ADDR));
640
641 return 0;
642 }
643
644 /*
645 * Present statistical information for this VFS mountpoint
646 */
647 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
648 {
649 int i, cpu;
650 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
651 struct rpc_auth *auth = nfss->client->cl_auth;
652 struct nfs_iostats totals = { };
653
654 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
655
656 /*
657 * Display all mount option settings
658 */
659 seq_printf(m, "\n\topts:\t");
660 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
661 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
662 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
663 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
664 nfs_show_mount_options(m, nfss, 1);
665
666 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
667
668 seq_printf(m, "\n\tcaps:\t");
669 seq_printf(m, "caps=0x%x", nfss->caps);
670 seq_printf(m, ",wtmult=%u", nfss->wtmult);
671 seq_printf(m, ",dtsize=%u", nfss->dtsize);
672 seq_printf(m, ",bsize=%u", nfss->bsize);
673 seq_printf(m, ",namlen=%u", nfss->namelen);
674
675 #ifdef CONFIG_NFS_V4
676 if (nfss->nfs_client->rpc_ops->version == 4) {
677 seq_printf(m, "\n\tnfsv4:\t");
678 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
679 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
680 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
681 }
682 #endif
683
684 /*
685 * Display security flavor in effect for this mount
686 */
687 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
688 if (auth->au_flavor)
689 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
690
691 /*
692 * Display superblock I/O counters
693 */
694 for_each_possible_cpu(cpu) {
695 struct nfs_iostats *stats;
696
697 preempt_disable();
698 stats = per_cpu_ptr(nfss->io_stats, cpu);
699
700 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
701 totals.events[i] += stats->events[i];
702 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
703 totals.bytes[i] += stats->bytes[i];
704 #ifdef CONFIG_NFS_FSCACHE
705 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
706 totals.fscache[i] += stats->fscache[i];
707 #endif
708
709 preempt_enable();
710 }
711
712 seq_printf(m, "\n\tevents:\t");
713 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
714 seq_printf(m, "%lu ", totals.events[i]);
715 seq_printf(m, "\n\tbytes:\t");
716 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
717 seq_printf(m, "%Lu ", totals.bytes[i]);
718 #ifdef CONFIG_NFS_FSCACHE
719 if (nfss->options & NFS_OPTION_FSCACHE) {
720 seq_printf(m, "\n\tfsc:\t");
721 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
722 seq_printf(m, "%Lu ", totals.bytes[i]);
723 }
724 #endif
725 seq_printf(m, "\n");
726
727 rpc_print_iostats(m, nfss->client);
728
729 return 0;
730 }
731
732 /*
733 * Begin unmount by attempting to remove all automounted mountpoints we added
734 * in response to xdev traversals and referrals
735 */
736 static void nfs_umount_begin(struct super_block *sb)
737 {
738 struct nfs_server *server;
739 struct rpc_clnt *rpc;
740
741 lock_kernel();
742
743 server = NFS_SB(sb);
744 /* -EIO all pending I/O */
745 rpc = server->client_acl;
746 if (!IS_ERR(rpc))
747 rpc_killall_tasks(rpc);
748 rpc = server->client;
749 if (!IS_ERR(rpc))
750 rpc_killall_tasks(rpc);
751
752 unlock_kernel();
753 }
754
755 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
756 {
757 struct nfs_parsed_mount_data *data;
758
759 data = kzalloc(sizeof(*data), GFP_KERNEL);
760 if (data) {
761 data->acregmin = NFS_DEF_ACREGMIN;
762 data->acregmax = NFS_DEF_ACREGMAX;
763 data->acdirmin = NFS_DEF_ACDIRMIN;
764 data->acdirmax = NFS_DEF_ACDIRMAX;
765 data->mount_server.port = NFS_UNSPEC_PORT;
766 data->nfs_server.port = NFS_UNSPEC_PORT;
767 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
768 data->auth_flavors[0] = RPC_AUTH_UNIX;
769 data->auth_flavor_len = 1;
770 data->version = version;
771 data->minorversion = 0;
772 }
773 return data;
774 }
775
776 /*
777 * Sanity-check a server address provided by the mount command.
778 *
779 * Address family must be initialized, and address must not be
780 * the ANY address for that family.
781 */
782 static int nfs_verify_server_address(struct sockaddr *addr)
783 {
784 switch (addr->sa_family) {
785 case AF_INET: {
786 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
787 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
788 }
789 case AF_INET6: {
790 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
791 return !ipv6_addr_any(sa);
792 }
793 }
794
795 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
796 return 0;
797 }
798
799 /*
800 * Select between a default port value and a user-specified port value.
801 * If a zero value is set, then autobind will be used.
802 */
803 static void nfs_set_port(struct sockaddr *sap, int *port,
804 const unsigned short default_port)
805 {
806 if (*port == NFS_UNSPEC_PORT)
807 *port = default_port;
808
809 rpc_set_port(sap, *port);
810 }
811
812 /*
813 * Sanity check the NFS transport protocol.
814 *
815 */
816 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
817 {
818 switch (mnt->nfs_server.protocol) {
819 case XPRT_TRANSPORT_UDP:
820 case XPRT_TRANSPORT_TCP:
821 case XPRT_TRANSPORT_RDMA:
822 break;
823 default:
824 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
825 }
826 }
827
828 /*
829 * For text based NFSv2/v3 mounts, the mount protocol transport default
830 * settings should depend upon the specified NFS transport.
831 */
832 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
833 {
834 nfs_validate_transport_protocol(mnt);
835
836 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
837 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
838 return;
839 switch (mnt->nfs_server.protocol) {
840 case XPRT_TRANSPORT_UDP:
841 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
842 break;
843 case XPRT_TRANSPORT_TCP:
844 case XPRT_TRANSPORT_RDMA:
845 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
846 }
847 }
848
849 /*
850 * Parse the value of the 'sec=' option.
851 */
852 static int nfs_parse_security_flavors(char *value,
853 struct nfs_parsed_mount_data *mnt)
854 {
855 substring_t args[MAX_OPT_ARGS];
856
857 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
858
859 switch (match_token(value, nfs_secflavor_tokens, args)) {
860 case Opt_sec_none:
861 mnt->auth_flavors[0] = RPC_AUTH_NULL;
862 break;
863 case Opt_sec_sys:
864 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
865 break;
866 case Opt_sec_krb5:
867 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
868 break;
869 case Opt_sec_krb5i:
870 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
871 break;
872 case Opt_sec_krb5p:
873 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
874 break;
875 case Opt_sec_lkey:
876 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
877 break;
878 case Opt_sec_lkeyi:
879 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
880 break;
881 case Opt_sec_lkeyp:
882 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
883 break;
884 case Opt_sec_spkm:
885 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
886 break;
887 case Opt_sec_spkmi:
888 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
889 break;
890 case Opt_sec_spkmp:
891 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
892 break;
893 default:
894 return 0;
895 }
896
897 mnt->auth_flavor_len = 1;
898 return 1;
899 }
900
901 /*
902 * Error-check and convert a string of mount options from user space into
903 * a data structure. The whole mount string is processed; bad options are
904 * skipped as they are encountered. If there were no errors, return 1;
905 * otherwise return 0 (zero).
906 */
907 static int nfs_parse_mount_options(char *raw,
908 struct nfs_parsed_mount_data *mnt)
909 {
910 char *p, *string, *secdata;
911 int rc, sloppy = 0, invalid_option = 0;
912
913 if (!raw) {
914 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
915 return 1;
916 }
917 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
918
919 secdata = alloc_secdata();
920 if (!secdata)
921 goto out_nomem;
922
923 rc = security_sb_copy_data(raw, secdata);
924 if (rc)
925 goto out_security_failure;
926
927 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
928 if (rc)
929 goto out_security_failure;
930
931 free_secdata(secdata);
932
933 while ((p = strsep(&raw, ",")) != NULL) {
934 substring_t args[MAX_OPT_ARGS];
935 unsigned long option;
936 int token;
937
938 if (!*p)
939 continue;
940
941 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
942
943 token = match_token(p, nfs_mount_option_tokens, args);
944 switch (token) {
945
946 /*
947 * boolean options: foo/nofoo
948 */
949 case Opt_soft:
950 mnt->flags |= NFS_MOUNT_SOFT;
951 break;
952 case Opt_hard:
953 mnt->flags &= ~NFS_MOUNT_SOFT;
954 break;
955 case Opt_posix:
956 mnt->flags |= NFS_MOUNT_POSIX;
957 break;
958 case Opt_noposix:
959 mnt->flags &= ~NFS_MOUNT_POSIX;
960 break;
961 case Opt_cto:
962 mnt->flags &= ~NFS_MOUNT_NOCTO;
963 break;
964 case Opt_nocto:
965 mnt->flags |= NFS_MOUNT_NOCTO;
966 break;
967 case Opt_ac:
968 mnt->flags &= ~NFS_MOUNT_NOAC;
969 break;
970 case Opt_noac:
971 mnt->flags |= NFS_MOUNT_NOAC;
972 break;
973 case Opt_lock:
974 mnt->flags &= ~NFS_MOUNT_NONLM;
975 break;
976 case Opt_nolock:
977 mnt->flags |= NFS_MOUNT_NONLM;
978 break;
979 case Opt_v2:
980 mnt->flags &= ~NFS_MOUNT_VER3;
981 mnt->version = 2;
982 break;
983 case Opt_v3:
984 mnt->flags |= NFS_MOUNT_VER3;
985 mnt->version = 3;
986 break;
987 #ifdef CONFIG_NFS_V4
988 case Opt_v4:
989 mnt->flags &= ~NFS_MOUNT_VER3;
990 mnt->version = 4;
991 break;
992 #endif
993 case Opt_udp:
994 mnt->flags &= ~NFS_MOUNT_TCP;
995 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
996 break;
997 case Opt_tcp:
998 mnt->flags |= NFS_MOUNT_TCP;
999 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1000 break;
1001 case Opt_rdma:
1002 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1003 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1004 xprt_load_transport(p);
1005 break;
1006 case Opt_acl:
1007 mnt->flags &= ~NFS_MOUNT_NOACL;
1008 break;
1009 case Opt_noacl:
1010 mnt->flags |= NFS_MOUNT_NOACL;
1011 break;
1012 case Opt_rdirplus:
1013 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1014 break;
1015 case Opt_nordirplus:
1016 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1017 break;
1018 case Opt_sharecache:
1019 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1020 break;
1021 case Opt_nosharecache:
1022 mnt->flags |= NFS_MOUNT_UNSHARED;
1023 break;
1024 case Opt_resvport:
1025 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1026 break;
1027 case Opt_noresvport:
1028 mnt->flags |= NFS_MOUNT_NORESVPORT;
1029 break;
1030 case Opt_fscache:
1031 mnt->options |= NFS_OPTION_FSCACHE;
1032 kfree(mnt->fscache_uniq);
1033 mnt->fscache_uniq = NULL;
1034 break;
1035 case Opt_nofscache:
1036 mnt->options &= ~NFS_OPTION_FSCACHE;
1037 kfree(mnt->fscache_uniq);
1038 mnt->fscache_uniq = NULL;
1039 break;
1040 case Opt_fscache_uniq:
1041 string = match_strdup(args);
1042 if (!string)
1043 goto out_nomem;
1044 kfree(mnt->fscache_uniq);
1045 mnt->fscache_uniq = string;
1046 mnt->options |= NFS_OPTION_FSCACHE;
1047 break;
1048
1049 /*
1050 * options that take numeric values
1051 */
1052 case Opt_port:
1053 string = match_strdup(args);
1054 if (string == NULL)
1055 goto out_nomem;
1056 rc = strict_strtoul(string, 10, &option);
1057 kfree(string);
1058 if (rc != 0 || option > USHORT_MAX)
1059 goto out_invalid_value;
1060 mnt->nfs_server.port = option;
1061 break;
1062 case Opt_rsize:
1063 string = match_strdup(args);
1064 if (string == NULL)
1065 goto out_nomem;
1066 rc = strict_strtoul(string, 10, &option);
1067 kfree(string);
1068 if (rc != 0)
1069 goto out_invalid_value;
1070 mnt->rsize = option;
1071 break;
1072 case Opt_wsize:
1073 string = match_strdup(args);
1074 if (string == NULL)
1075 goto out_nomem;
1076 rc = strict_strtoul(string, 10, &option);
1077 kfree(string);
1078 if (rc != 0)
1079 goto out_invalid_value;
1080 mnt->wsize = option;
1081 break;
1082 case Opt_bsize:
1083 string = match_strdup(args);
1084 if (string == NULL)
1085 goto out_nomem;
1086 rc = strict_strtoul(string, 10, &option);
1087 kfree(string);
1088 if (rc != 0)
1089 goto out_invalid_value;
1090 mnt->bsize = option;
1091 break;
1092 case Opt_timeo:
1093 string = match_strdup(args);
1094 if (string == NULL)
1095 goto out_nomem;
1096 rc = strict_strtoul(string, 10, &option);
1097 kfree(string);
1098 if (rc != 0 || option == 0)
1099 goto out_invalid_value;
1100 mnt->timeo = option;
1101 break;
1102 case Opt_retrans:
1103 string = match_strdup(args);
1104 if (string == NULL)
1105 goto out_nomem;
1106 rc = strict_strtoul(string, 10, &option);
1107 kfree(string);
1108 if (rc != 0 || option == 0)
1109 goto out_invalid_value;
1110 mnt->retrans = option;
1111 break;
1112 case Opt_acregmin:
1113 string = match_strdup(args);
1114 if (string == NULL)
1115 goto out_nomem;
1116 rc = strict_strtoul(string, 10, &option);
1117 kfree(string);
1118 if (rc != 0)
1119 goto out_invalid_value;
1120 mnt->acregmin = option;
1121 break;
1122 case Opt_acregmax:
1123 string = match_strdup(args);
1124 if (string == NULL)
1125 goto out_nomem;
1126 rc = strict_strtoul(string, 10, &option);
1127 kfree(string);
1128 if (rc != 0)
1129 goto out_invalid_value;
1130 mnt->acregmax = option;
1131 break;
1132 case Opt_acdirmin:
1133 string = match_strdup(args);
1134 if (string == NULL)
1135 goto out_nomem;
1136 rc = strict_strtoul(string, 10, &option);
1137 kfree(string);
1138 if (rc != 0)
1139 goto out_invalid_value;
1140 mnt->acdirmin = option;
1141 break;
1142 case Opt_acdirmax:
1143 string = match_strdup(args);
1144 if (string == NULL)
1145 goto out_nomem;
1146 rc = strict_strtoul(string, 10, &option);
1147 kfree(string);
1148 if (rc != 0)
1149 goto out_invalid_value;
1150 mnt->acdirmax = option;
1151 break;
1152 case Opt_actimeo:
1153 string = match_strdup(args);
1154 if (string == NULL)
1155 goto out_nomem;
1156 rc = strict_strtoul(string, 10, &option);
1157 kfree(string);
1158 if (rc != 0)
1159 goto out_invalid_value;
1160 mnt->acregmin = mnt->acregmax =
1161 mnt->acdirmin = mnt->acdirmax = option;
1162 break;
1163 case Opt_namelen:
1164 string = match_strdup(args);
1165 if (string == NULL)
1166 goto out_nomem;
1167 rc = strict_strtoul(string, 10, &option);
1168 kfree(string);
1169 if (rc != 0)
1170 goto out_invalid_value;
1171 mnt->namlen = option;
1172 break;
1173 case Opt_mountport:
1174 string = match_strdup(args);
1175 if (string == NULL)
1176 goto out_nomem;
1177 rc = strict_strtoul(string, 10, &option);
1178 kfree(string);
1179 if (rc != 0 || option > USHORT_MAX)
1180 goto out_invalid_value;
1181 mnt->mount_server.port = option;
1182 break;
1183 case Opt_mountvers:
1184 string = match_strdup(args);
1185 if (string == NULL)
1186 goto out_nomem;
1187 rc = strict_strtoul(string, 10, &option);
1188 kfree(string);
1189 if (rc != 0 ||
1190 option < NFS_MNT_VERSION ||
1191 option > NFS_MNT3_VERSION)
1192 goto out_invalid_value;
1193 mnt->mount_server.version = option;
1194 break;
1195 case Opt_nfsvers:
1196 string = match_strdup(args);
1197 if (string == NULL)
1198 goto out_nomem;
1199 rc = strict_strtoul(string, 10, &option);
1200 kfree(string);
1201 if (rc != 0)
1202 goto out_invalid_value;
1203 switch (option) {
1204 case NFS2_VERSION:
1205 mnt->flags &= ~NFS_MOUNT_VER3;
1206 mnt->version = 2;
1207 break;
1208 case NFS3_VERSION:
1209 mnt->flags |= NFS_MOUNT_VER3;
1210 mnt->version = 3;
1211 break;
1212 #ifdef CONFIG_NFS_V4
1213 case NFS4_VERSION:
1214 mnt->flags &= ~NFS_MOUNT_VER3;
1215 mnt->version = 4;
1216 break;
1217 #endif
1218 default:
1219 goto out_invalid_value;
1220 }
1221 break;
1222 case Opt_minorversion:
1223 string = match_strdup(args);
1224 if (string == NULL)
1225 goto out_nomem;
1226 rc = strict_strtoul(string, 10, &option);
1227 kfree(string);
1228 if (rc != 0)
1229 goto out_invalid_value;
1230 if (option > NFS4_MAX_MINOR_VERSION)
1231 goto out_invalid_value;
1232 mnt->minorversion = option;
1233 break;
1234
1235 /*
1236 * options that take text values
1237 */
1238 case Opt_sec:
1239 string = match_strdup(args);
1240 if (string == NULL)
1241 goto out_nomem;
1242 rc = nfs_parse_security_flavors(string, mnt);
1243 kfree(string);
1244 if (!rc) {
1245 dfprintk(MOUNT, "NFS: unrecognized "
1246 "security flavor\n");
1247 return 0;
1248 }
1249 break;
1250 case Opt_proto:
1251 string = match_strdup(args);
1252 if (string == NULL)
1253 goto out_nomem;
1254 token = match_token(string,
1255 nfs_xprt_protocol_tokens, args);
1256
1257 switch (token) {
1258 case Opt_xprt_udp:
1259 mnt->flags &= ~NFS_MOUNT_TCP;
1260 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1261 kfree(string);
1262 break;
1263 case Opt_xprt_tcp:
1264 mnt->flags |= NFS_MOUNT_TCP;
1265 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1266 kfree(string);
1267 break;
1268 case Opt_xprt_rdma:
1269 /* vector side protocols to TCP */
1270 mnt->flags |= NFS_MOUNT_TCP;
1271 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1272 xprt_load_transport(string);
1273 kfree(string);
1274 break;
1275 default:
1276 dfprintk(MOUNT, "NFS: unrecognized "
1277 "transport protocol\n");
1278 kfree(string);
1279 return 0;
1280 }
1281 break;
1282 case Opt_mountproto:
1283 string = match_strdup(args);
1284 if (string == NULL)
1285 goto out_nomem;
1286 token = match_token(string,
1287 nfs_xprt_protocol_tokens, args);
1288 kfree(string);
1289
1290 switch (token) {
1291 case Opt_xprt_udp:
1292 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1293 break;
1294 case Opt_xprt_tcp:
1295 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1296 break;
1297 case Opt_xprt_rdma: /* not used for side protocols */
1298 default:
1299 dfprintk(MOUNT, "NFS: unrecognized "
1300 "transport protocol\n");
1301 return 0;
1302 }
1303 break;
1304 case Opt_addr:
1305 string = match_strdup(args);
1306 if (string == NULL)
1307 goto out_nomem;
1308 mnt->nfs_server.addrlen =
1309 rpc_pton(string, strlen(string),
1310 (struct sockaddr *)
1311 &mnt->nfs_server.address,
1312 sizeof(mnt->nfs_server.address));
1313 kfree(string);
1314 if (mnt->nfs_server.addrlen == 0)
1315 goto out_invalid_address;
1316 break;
1317 case Opt_clientaddr:
1318 string = match_strdup(args);
1319 if (string == NULL)
1320 goto out_nomem;
1321 kfree(mnt->client_address);
1322 mnt->client_address = string;
1323 break;
1324 case Opt_mounthost:
1325 string = match_strdup(args);
1326 if (string == NULL)
1327 goto out_nomem;
1328 kfree(mnt->mount_server.hostname);
1329 mnt->mount_server.hostname = string;
1330 break;
1331 case Opt_mountaddr:
1332 string = match_strdup(args);
1333 if (string == NULL)
1334 goto out_nomem;
1335 mnt->mount_server.addrlen =
1336 rpc_pton(string, strlen(string),
1337 (struct sockaddr *)
1338 &mnt->mount_server.address,
1339 sizeof(mnt->mount_server.address));
1340 kfree(string);
1341 if (mnt->mount_server.addrlen == 0)
1342 goto out_invalid_address;
1343 break;
1344 case Opt_lookupcache:
1345 string = match_strdup(args);
1346 if (string == NULL)
1347 goto out_nomem;
1348 token = match_token(string,
1349 nfs_lookupcache_tokens, args);
1350 kfree(string);
1351 switch (token) {
1352 case Opt_lookupcache_all:
1353 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1354 break;
1355 case Opt_lookupcache_positive:
1356 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1357 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1358 break;
1359 case Opt_lookupcache_none:
1360 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1361 break;
1362 default:
1363 dfprintk(MOUNT, "NFS: invalid "
1364 "lookupcache argument\n");
1365 return 0;
1366 };
1367 break;
1368
1369 /*
1370 * Special options
1371 */
1372 case Opt_sloppy:
1373 sloppy = 1;
1374 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1375 break;
1376 case Opt_userspace:
1377 case Opt_deprecated:
1378 dfprintk(MOUNT, "NFS: ignoring mount option "
1379 "'%s'\n", p);
1380 break;
1381
1382 default:
1383 invalid_option = 1;
1384 dfprintk(MOUNT, "NFS: unrecognized mount option "
1385 "'%s'\n", p);
1386 }
1387 }
1388
1389 if (!sloppy && invalid_option)
1390 return 0;
1391
1392 return 1;
1393
1394 out_invalid_address:
1395 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1396 return 0;
1397 out_invalid_value:
1398 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1399 return 0;
1400 out_nomem:
1401 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1402 return 0;
1403 out_security_failure:
1404 free_secdata(secdata);
1405 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1406 return 0;
1407 }
1408
1409 /*
1410 * Match the requested auth flavors with the list returned by
1411 * the server. Returns zero and sets the mount's authentication
1412 * flavor on success; returns -EACCES if server does not support
1413 * the requested flavor.
1414 */
1415 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1416 struct nfs_mount_request *request)
1417 {
1418 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1419
1420 /*
1421 * Certain releases of Linux's mountd return an empty
1422 * flavor list. To prevent behavioral regression with
1423 * these servers (ie. rejecting mounts that used to
1424 * succeed), revert to pre-2.6.32 behavior (no checking)
1425 * if the returned flavor list is empty.
1426 */
1427 if (server_authlist_len == 0)
1428 return 0;
1429
1430 /*
1431 * We avoid sophisticated negotiating here, as there are
1432 * plenty of cases where we can get it wrong, providing
1433 * either too little or too much security.
1434 *
1435 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1436 * flavor listed first. However, some servers list
1437 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1438 * preferred default, in args->auth_flavors[0] if user
1439 * didn't specify sec= mount option.
1440 */
1441 for (i = 0; i < args->auth_flavor_len; i++)
1442 for (j = 0; j < server_authlist_len; j++)
1443 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1444 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1445 request->auth_flavs[j]);
1446 args->auth_flavors[0] = request->auth_flavs[j];
1447 return 0;
1448 }
1449
1450 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1451 nfs_umount(request);
1452 return -EACCES;
1453 }
1454
1455 /*
1456 * Use the remote server's MOUNT service to request the NFS file handle
1457 * corresponding to the provided path.
1458 */
1459 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1460 struct nfs_fh *root_fh)
1461 {
1462 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1463 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1464 struct nfs_mount_request request = {
1465 .sap = (struct sockaddr *)
1466 &args->mount_server.address,
1467 .dirpath = args->nfs_server.export_path,
1468 .protocol = args->mount_server.protocol,
1469 .fh = root_fh,
1470 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1471 .auth_flav_len = &server_authlist_len,
1472 .auth_flavs = server_authlist,
1473 };
1474 int status;
1475
1476 if (args->mount_server.version == 0) {
1477 switch (args->version) {
1478 default:
1479 args->mount_server.version = NFS_MNT3_VERSION;
1480 break;
1481 case 2:
1482 args->mount_server.version = NFS_MNT_VERSION;
1483 }
1484 }
1485 request.version = args->mount_server.version;
1486
1487 if (args->mount_server.hostname)
1488 request.hostname = args->mount_server.hostname;
1489 else
1490 request.hostname = args->nfs_server.hostname;
1491
1492 /*
1493 * Construct the mount server's address.
1494 */
1495 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1496 memcpy(request.sap, &args->nfs_server.address,
1497 args->nfs_server.addrlen);
1498 args->mount_server.addrlen = args->nfs_server.addrlen;
1499 }
1500 request.salen = args->mount_server.addrlen;
1501 nfs_set_port(request.sap, &args->mount_server.port, 0);
1502
1503 /*
1504 * Now ask the mount server to map our export path
1505 * to a file handle.
1506 */
1507 status = nfs_mount(&request);
1508 if (status != 0) {
1509 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1510 request.hostname, status);
1511 return status;
1512 }
1513
1514 /*
1515 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1516 */
1517 if (args->mount_server.version != NFS_MNT3_VERSION)
1518 return 0;
1519 return nfs_walk_authlist(args, &request);
1520 }
1521
1522 static int nfs_parse_simple_hostname(const char *dev_name,
1523 char **hostname, size_t maxnamlen,
1524 char **export_path, size_t maxpathlen)
1525 {
1526 size_t len;
1527 char *colon, *comma;
1528
1529 colon = strchr(dev_name, ':');
1530 if (colon == NULL)
1531 goto out_bad_devname;
1532
1533 len = colon - dev_name;
1534 if (len > maxnamlen)
1535 goto out_hostname;
1536
1537 /* N.B. caller will free nfs_server.hostname in all cases */
1538 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1539 if (!*hostname)
1540 goto out_nomem;
1541
1542 /* kill possible hostname list: not supported */
1543 comma = strchr(*hostname, ',');
1544 if (comma != NULL) {
1545 if (comma == *hostname)
1546 goto out_bad_devname;
1547 *comma = '\0';
1548 }
1549
1550 colon++;
1551 len = strlen(colon);
1552 if (len > maxpathlen)
1553 goto out_path;
1554 *export_path = kstrndup(colon, len, GFP_KERNEL);
1555 if (!*export_path)
1556 goto out_nomem;
1557
1558 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1559 return 0;
1560
1561 out_bad_devname:
1562 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1563 return -EINVAL;
1564
1565 out_nomem:
1566 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1567 return -ENOMEM;
1568
1569 out_hostname:
1570 dfprintk(MOUNT, "NFS: server hostname too long\n");
1571 return -ENAMETOOLONG;
1572
1573 out_path:
1574 dfprintk(MOUNT, "NFS: export pathname too long\n");
1575 return -ENAMETOOLONG;
1576 }
1577
1578 /*
1579 * Hostname has square brackets around it because it contains one or
1580 * more colons. We look for the first closing square bracket, and a
1581 * colon must follow it.
1582 */
1583 static int nfs_parse_protected_hostname(const char *dev_name,
1584 char **hostname, size_t maxnamlen,
1585 char **export_path, size_t maxpathlen)
1586 {
1587 size_t len;
1588 char *start, *end;
1589
1590 start = (char *)(dev_name + 1);
1591
1592 end = strchr(start, ']');
1593 if (end == NULL)
1594 goto out_bad_devname;
1595 if (*(end + 1) != ':')
1596 goto out_bad_devname;
1597
1598 len = end - start;
1599 if (len > maxnamlen)
1600 goto out_hostname;
1601
1602 /* N.B. caller will free nfs_server.hostname in all cases */
1603 *hostname = kstrndup(start, len, GFP_KERNEL);
1604 if (*hostname == NULL)
1605 goto out_nomem;
1606
1607 end += 2;
1608 len = strlen(end);
1609 if (len > maxpathlen)
1610 goto out_path;
1611 *export_path = kstrndup(end, len, GFP_KERNEL);
1612 if (!*export_path)
1613 goto out_nomem;
1614
1615 return 0;
1616
1617 out_bad_devname:
1618 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1619 return -EINVAL;
1620
1621 out_nomem:
1622 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1623 return -ENOMEM;
1624
1625 out_hostname:
1626 dfprintk(MOUNT, "NFS: server hostname too long\n");
1627 return -ENAMETOOLONG;
1628
1629 out_path:
1630 dfprintk(MOUNT, "NFS: export pathname too long\n");
1631 return -ENAMETOOLONG;
1632 }
1633
1634 /*
1635 * Split "dev_name" into "hostname:export_path".
1636 *
1637 * The leftmost colon demarks the split between the server's hostname
1638 * and the export path. If the hostname starts with a left square
1639 * bracket, then it may contain colons.
1640 *
1641 * Note: caller frees hostname and export path, even on error.
1642 */
1643 static int nfs_parse_devname(const char *dev_name,
1644 char **hostname, size_t maxnamlen,
1645 char **export_path, size_t maxpathlen)
1646 {
1647 if (*dev_name == '[')
1648 return nfs_parse_protected_hostname(dev_name,
1649 hostname, maxnamlen,
1650 export_path, maxpathlen);
1651
1652 return nfs_parse_simple_hostname(dev_name,
1653 hostname, maxnamlen,
1654 export_path, maxpathlen);
1655 }
1656
1657 /*
1658 * Validate the NFS2/NFS3 mount data
1659 * - fills in the mount root filehandle
1660 *
1661 * For option strings, user space handles the following behaviors:
1662 *
1663 * + DNS: mapping server host name to IP address ("addr=" option)
1664 *
1665 * + failure mode: how to behave if a mount request can't be handled
1666 * immediately ("fg/bg" option)
1667 *
1668 * + retry: how often to retry a mount request ("retry=" option)
1669 *
1670 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1671 * mountproto=tcp after mountproto=udp, and so on
1672 */
1673 static int nfs_validate_mount_data(void *options,
1674 struct nfs_parsed_mount_data *args,
1675 struct nfs_fh *mntfh,
1676 const char *dev_name)
1677 {
1678 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1679 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1680
1681 if (data == NULL)
1682 goto out_no_data;
1683
1684 switch (data->version) {
1685 case 1:
1686 data->namlen = 0;
1687 case 2:
1688 data->bsize = 0;
1689 case 3:
1690 if (data->flags & NFS_MOUNT_VER3)
1691 goto out_no_v3;
1692 data->root.size = NFS2_FHSIZE;
1693 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1694 case 4:
1695 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1696 goto out_no_sec;
1697 case 5:
1698 memset(data->context, 0, sizeof(data->context));
1699 case 6:
1700 if (data->flags & NFS_MOUNT_VER3) {
1701 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1702 goto out_invalid_fh;
1703 mntfh->size = data->root.size;
1704 args->version = 3;
1705 } else {
1706 mntfh->size = NFS2_FHSIZE;
1707 args->version = 2;
1708 }
1709
1710
1711 memcpy(mntfh->data, data->root.data, mntfh->size);
1712 if (mntfh->size < sizeof(mntfh->data))
1713 memset(mntfh->data + mntfh->size, 0,
1714 sizeof(mntfh->data) - mntfh->size);
1715
1716 /*
1717 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1718 * can deal with.
1719 */
1720 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1721 args->rsize = data->rsize;
1722 args->wsize = data->wsize;
1723 args->timeo = data->timeo;
1724 args->retrans = data->retrans;
1725 args->acregmin = data->acregmin;
1726 args->acregmax = data->acregmax;
1727 args->acdirmin = data->acdirmin;
1728 args->acdirmax = data->acdirmax;
1729
1730 memcpy(sap, &data->addr, sizeof(data->addr));
1731 args->nfs_server.addrlen = sizeof(data->addr);
1732 if (!nfs_verify_server_address(sap))
1733 goto out_no_address;
1734
1735 if (!(data->flags & NFS_MOUNT_TCP))
1736 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1737 /* N.B. caller will free nfs_server.hostname in all cases */
1738 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1739 args->namlen = data->namlen;
1740 args->bsize = data->bsize;
1741
1742 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1743 args->auth_flavors[0] = data->pseudoflavor;
1744 if (!args->nfs_server.hostname)
1745 goto out_nomem;
1746
1747 /*
1748 * The legacy version 6 binary mount data from userspace has a
1749 * field used only to transport selinux information into the
1750 * the kernel. To continue to support that functionality we
1751 * have a touch of selinux knowledge here in the NFS code. The
1752 * userspace code converted context=blah to just blah so we are
1753 * converting back to the full string selinux understands.
1754 */
1755 if (data->context[0]){
1756 #ifdef CONFIG_SECURITY_SELINUX
1757 int rc;
1758 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1759 if (!opts_str)
1760 return -ENOMEM;
1761 strcpy(opts_str, "context=");
1762 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1763 strcat(opts_str, &data->context[0]);
1764 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1765 kfree(opts_str);
1766 if (rc)
1767 return rc;
1768 #else
1769 return -EINVAL;
1770 #endif
1771 }
1772
1773 break;
1774 default: {
1775 int status;
1776
1777 if (nfs_parse_mount_options((char *)options, args) == 0)
1778 return -EINVAL;
1779
1780 if (!nfs_verify_server_address(sap))
1781 goto out_no_address;
1782
1783 if (args->version == 4)
1784 #ifdef CONFIG_NFS_V4
1785 return nfs4_validate_text_mount_data(options,
1786 args, dev_name);
1787 #else
1788 goto out_v4_not_compiled;
1789 #endif
1790
1791 nfs_set_port(sap, &args->nfs_server.port, 0);
1792
1793 nfs_set_mount_transport_protocol(args);
1794
1795 status = nfs_parse_devname(dev_name,
1796 &args->nfs_server.hostname,
1797 PAGE_SIZE,
1798 &args->nfs_server.export_path,
1799 NFS_MAXPATHLEN);
1800 if (!status)
1801 status = nfs_try_mount(args, mntfh);
1802
1803 kfree(args->nfs_server.export_path);
1804 args->nfs_server.export_path = NULL;
1805
1806 if (status)
1807 return status;
1808
1809 break;
1810 }
1811 }
1812
1813 #ifndef CONFIG_NFS_V3
1814 if (args->version == 3)
1815 goto out_v3_not_compiled;
1816 #endif /* !CONFIG_NFS_V3 */
1817
1818 return 0;
1819
1820 out_no_data:
1821 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1822 return -EINVAL;
1823
1824 out_no_v3:
1825 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1826 data->version);
1827 return -EINVAL;
1828
1829 out_no_sec:
1830 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1831 return -EINVAL;
1832
1833 #ifndef CONFIG_NFS_V3
1834 out_v3_not_compiled:
1835 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1836 return -EPROTONOSUPPORT;
1837 #endif /* !CONFIG_NFS_V3 */
1838
1839 #ifndef CONFIG_NFS_V4
1840 out_v4_not_compiled:
1841 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1842 return -EPROTONOSUPPORT;
1843 #endif /* !CONFIG_NFS_V4 */
1844
1845 out_nomem:
1846 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1847 return -ENOMEM;
1848
1849 out_no_address:
1850 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1851 return -EINVAL;
1852
1853 out_invalid_fh:
1854 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1855 return -EINVAL;
1856 }
1857
1858 static int
1859 nfs_compare_remount_data(struct nfs_server *nfss,
1860 struct nfs_parsed_mount_data *data)
1861 {
1862 if (data->flags != nfss->flags ||
1863 data->rsize != nfss->rsize ||
1864 data->wsize != nfss->wsize ||
1865 data->retrans != nfss->client->cl_timeout->to_retries ||
1866 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1867 data->acregmin != nfss->acregmin / HZ ||
1868 data->acregmax != nfss->acregmax / HZ ||
1869 data->acdirmin != nfss->acdirmin / HZ ||
1870 data->acdirmax != nfss->acdirmax / HZ ||
1871 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1872 data->nfs_server.port != nfss->port ||
1873 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1874 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1875 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1876 return -EINVAL;
1877
1878 return 0;
1879 }
1880
1881 static int
1882 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1883 {
1884 int error;
1885 struct nfs_server *nfss = sb->s_fs_info;
1886 struct nfs_parsed_mount_data *data;
1887 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1888 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1889 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1890
1891 /*
1892 * Userspace mount programs that send binary options generally send
1893 * them populated with default values. We have no way to know which
1894 * ones were explicitly specified. Fall back to legacy behavior and
1895 * just return success.
1896 */
1897 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1898 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1899 options->version <= 6))))
1900 return 0;
1901
1902 data = kzalloc(sizeof(*data), GFP_KERNEL);
1903 if (data == NULL)
1904 return -ENOMEM;
1905
1906 lock_kernel();
1907 /* fill out struct with values from existing mount */
1908 data->flags = nfss->flags;
1909 data->rsize = nfss->rsize;
1910 data->wsize = nfss->wsize;
1911 data->retrans = nfss->client->cl_timeout->to_retries;
1912 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1913 data->acregmin = nfss->acregmin / HZ;
1914 data->acregmax = nfss->acregmax / HZ;
1915 data->acdirmin = nfss->acdirmin / HZ;
1916 data->acdirmax = nfss->acdirmax / HZ;
1917 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1918 data->nfs_server.port = nfss->port;
1919 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1920 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1921 data->nfs_server.addrlen);
1922
1923 /* overwrite those values with any that were specified */
1924 error = nfs_parse_mount_options((char *)options, data);
1925 if (error < 0)
1926 goto out;
1927
1928 /*
1929 * noac is a special case. It implies -o sync, but that's not
1930 * necessarily reflected in the mtab options. do_remount_sb
1931 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
1932 * remount options, so we have to explicitly reset it.
1933 */
1934 if (data->flags & NFS_MOUNT_NOAC)
1935 *flags |= MS_SYNCHRONOUS;
1936
1937 /* compare new mount options with old ones */
1938 error = nfs_compare_remount_data(nfss, data);
1939 out:
1940 kfree(data);
1941 unlock_kernel();
1942 return error;
1943 }
1944
1945 /*
1946 * Initialise the common bits of the superblock
1947 */
1948 static inline void nfs_initialise_sb(struct super_block *sb)
1949 {
1950 struct nfs_server *server = NFS_SB(sb);
1951
1952 sb->s_magic = NFS_SUPER_MAGIC;
1953
1954 /* We probably want something more informative here */
1955 snprintf(sb->s_id, sizeof(sb->s_id),
1956 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1957
1958 if (sb->s_blocksize == 0)
1959 sb->s_blocksize = nfs_block_bits(server->wsize,
1960 &sb->s_blocksize_bits);
1961
1962 if (server->flags & NFS_MOUNT_NOAC)
1963 sb->s_flags |= MS_SYNCHRONOUS;
1964
1965 sb->s_bdi = &server->backing_dev_info;
1966
1967 nfs_super_set_maxbytes(sb, server->maxfilesize);
1968 }
1969
1970 /*
1971 * Finish setting up an NFS2/3 superblock
1972 */
1973 static void nfs_fill_super(struct super_block *sb,
1974 struct nfs_parsed_mount_data *data)
1975 {
1976 struct nfs_server *server = NFS_SB(sb);
1977
1978 sb->s_blocksize_bits = 0;
1979 sb->s_blocksize = 0;
1980 if (data->bsize)
1981 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1982
1983 if (server->nfs_client->rpc_ops->version == 3) {
1984 /* The VFS shouldn't apply the umask to mode bits. We will do
1985 * so ourselves when necessary.
1986 */
1987 sb->s_flags |= MS_POSIXACL;
1988 sb->s_time_gran = 1;
1989 }
1990
1991 sb->s_op = &nfs_sops;
1992 nfs_initialise_sb(sb);
1993 }
1994
1995 /*
1996 * Finish setting up a cloned NFS2/3 superblock
1997 */
1998 static void nfs_clone_super(struct super_block *sb,
1999 const struct super_block *old_sb)
2000 {
2001 struct nfs_server *server = NFS_SB(sb);
2002
2003 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2004 sb->s_blocksize = old_sb->s_blocksize;
2005 sb->s_maxbytes = old_sb->s_maxbytes;
2006
2007 if (server->nfs_client->rpc_ops->version == 3) {
2008 /* The VFS shouldn't apply the umask to mode bits. We will do
2009 * so ourselves when necessary.
2010 */
2011 sb->s_flags |= MS_POSIXACL;
2012 sb->s_time_gran = 1;
2013 }
2014
2015 sb->s_op = old_sb->s_op;
2016 nfs_initialise_sb(sb);
2017 }
2018
2019 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2020 {
2021 const struct nfs_server *a = s->s_fs_info;
2022 const struct rpc_clnt *clnt_a = a->client;
2023 const struct rpc_clnt *clnt_b = b->client;
2024
2025 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2026 goto Ebusy;
2027 if (a->nfs_client != b->nfs_client)
2028 goto Ebusy;
2029 if (a->flags != b->flags)
2030 goto Ebusy;
2031 if (a->wsize != b->wsize)
2032 goto Ebusy;
2033 if (a->rsize != b->rsize)
2034 goto Ebusy;
2035 if (a->acregmin != b->acregmin)
2036 goto Ebusy;
2037 if (a->acregmax != b->acregmax)
2038 goto Ebusy;
2039 if (a->acdirmin != b->acdirmin)
2040 goto Ebusy;
2041 if (a->acdirmax != b->acdirmax)
2042 goto Ebusy;
2043 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2044 goto Ebusy;
2045 return 1;
2046 Ebusy:
2047 return 0;
2048 }
2049
2050 struct nfs_sb_mountdata {
2051 struct nfs_server *server;
2052 int mntflags;
2053 };
2054
2055 static int nfs_set_super(struct super_block *s, void *data)
2056 {
2057 struct nfs_sb_mountdata *sb_mntdata = data;
2058 struct nfs_server *server = sb_mntdata->server;
2059 int ret;
2060
2061 s->s_flags = sb_mntdata->mntflags;
2062 s->s_fs_info = server;
2063 ret = set_anon_super(s, server);
2064 if (ret == 0)
2065 server->s_dev = s->s_dev;
2066 return ret;
2067 }
2068
2069 static int nfs_compare_super_address(struct nfs_server *server1,
2070 struct nfs_server *server2)
2071 {
2072 struct sockaddr *sap1, *sap2;
2073
2074 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2075 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2076
2077 if (sap1->sa_family != sap2->sa_family)
2078 return 0;
2079
2080 switch (sap1->sa_family) {
2081 case AF_INET: {
2082 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2083 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2084 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2085 return 0;
2086 if (sin1->sin_port != sin2->sin_port)
2087 return 0;
2088 break;
2089 }
2090 case AF_INET6: {
2091 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2092 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2093 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2094 return 0;
2095 if (sin1->sin6_port != sin2->sin6_port)
2096 return 0;
2097 break;
2098 }
2099 default:
2100 return 0;
2101 }
2102
2103 return 1;
2104 }
2105
2106 static int nfs_compare_super(struct super_block *sb, void *data)
2107 {
2108 struct nfs_sb_mountdata *sb_mntdata = data;
2109 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2110 int mntflags = sb_mntdata->mntflags;
2111
2112 if (!nfs_compare_super_address(old, server))
2113 return 0;
2114 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2115 if (old->flags & NFS_MOUNT_UNSHARED)
2116 return 0;
2117 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2118 return 0;
2119 return nfs_compare_mount_options(sb, server, mntflags);
2120 }
2121
2122 static int nfs_bdi_register(struct nfs_server *server)
2123 {
2124 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2125 }
2126
2127 static int nfs_get_sb(struct file_system_type *fs_type,
2128 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2129 {
2130 struct nfs_server *server = NULL;
2131 struct super_block *s;
2132 struct nfs_parsed_mount_data *data;
2133 struct nfs_fh *mntfh;
2134 struct dentry *mntroot;
2135 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2136 struct nfs_sb_mountdata sb_mntdata = {
2137 .mntflags = flags,
2138 };
2139 int error = -ENOMEM;
2140
2141 data = nfs_alloc_parsed_mount_data(3);
2142 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2143 if (data == NULL || mntfh == NULL)
2144 goto out_free_fh;
2145
2146 security_init_mnt_opts(&data->lsm_opts);
2147
2148 /* Validate the mount data */
2149 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2150 if (error < 0)
2151 goto out;
2152
2153 #ifdef CONFIG_NFS_V4
2154 if (data->version == 4) {
2155 error = nfs4_try_mount(flags, dev_name, data, mnt);
2156 kfree(data->client_address);
2157 goto out;
2158 }
2159 #endif /* CONFIG_NFS_V4 */
2160
2161 /* Get a volume representation */
2162 server = nfs_create_server(data, mntfh);
2163 if (IS_ERR(server)) {
2164 error = PTR_ERR(server);
2165 goto out;
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(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_fill_super(s, data);
2191 nfs_fscache_get_super_cookie(
2192 s, data ? data->fscache_uniq : NULL, NULL);
2193 }
2194
2195 mntroot = nfs_get_root(s, mntfh);
2196 if (IS_ERR(mntroot)) {
2197 error = PTR_ERR(mntroot);
2198 goto error_splat_super;
2199 }
2200
2201 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2202 if (error)
2203 goto error_splat_root;
2204
2205 s->s_flags |= MS_ACTIVE;
2206 mnt->mnt_sb = s;
2207 mnt->mnt_root = mntroot;
2208 error = 0;
2209
2210 out:
2211 kfree(data->nfs_server.hostname);
2212 kfree(data->mount_server.hostname);
2213 kfree(data->fscache_uniq);
2214 security_free_mnt_opts(&data->lsm_opts);
2215 out_free_fh:
2216 kfree(mntfh);
2217 kfree(data);
2218 return error;
2219
2220 out_err_nosb:
2221 nfs_free_server(server);
2222 goto out;
2223
2224 error_splat_root:
2225 dput(mntroot);
2226 error_splat_super:
2227 deactivate_locked_super(s);
2228 goto out;
2229 }
2230
2231 /*
2232 * Ensure that we unregister the bdi before kill_anon_super
2233 * releases the device name
2234 */
2235 static void nfs_put_super(struct super_block *s)
2236 {
2237 struct nfs_server *server = NFS_SB(s);
2238
2239 bdi_unregister(&server->backing_dev_info);
2240 }
2241
2242 /*
2243 * Destroy an NFS2/3 superblock
2244 */
2245 static void nfs_kill_super(struct super_block *s)
2246 {
2247 struct nfs_server *server = NFS_SB(s);
2248
2249 kill_anon_super(s);
2250 nfs_fscache_release_super_cookie(s);
2251 nfs_free_server(server);
2252 }
2253
2254 /*
2255 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2256 */
2257 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2258 const char *dev_name, void *raw_data,
2259 struct vfsmount *mnt)
2260 {
2261 struct nfs_clone_mount *data = raw_data;
2262 struct super_block *s;
2263 struct nfs_server *server;
2264 struct dentry *mntroot;
2265 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2266 struct nfs_sb_mountdata sb_mntdata = {
2267 .mntflags = flags,
2268 };
2269 int error;
2270
2271 dprintk("--> nfs_xdev_get_sb()\n");
2272
2273 /* create a new volume representation */
2274 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2275 if (IS_ERR(server)) {
2276 error = PTR_ERR(server);
2277 goto out_err_noserver;
2278 }
2279 sb_mntdata.server = server;
2280
2281 if (server->flags & NFS_MOUNT_UNSHARED)
2282 compare_super = NULL;
2283
2284 /* Get a superblock - note that we may end up sharing one that already exists */
2285 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2286 if (IS_ERR(s)) {
2287 error = PTR_ERR(s);
2288 goto out_err_nosb;
2289 }
2290
2291 if (s->s_fs_info != server) {
2292 nfs_free_server(server);
2293 server = NULL;
2294 } else {
2295 error = nfs_bdi_register(server);
2296 if (error)
2297 goto error_splat_super;
2298 }
2299
2300 if (!s->s_root) {
2301 /* initial superblock/root creation */
2302 nfs_clone_super(s, data->sb);
2303 nfs_fscache_get_super_cookie(s, NULL, data);
2304 }
2305
2306 mntroot = nfs_get_root(s, data->fh);
2307 if (IS_ERR(mntroot)) {
2308 error = PTR_ERR(mntroot);
2309 goto error_splat_super;
2310 }
2311 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2312 dput(mntroot);
2313 error = -ESTALE;
2314 goto error_splat_super;
2315 }
2316
2317 s->s_flags |= MS_ACTIVE;
2318 mnt->mnt_sb = s;
2319 mnt->mnt_root = mntroot;
2320
2321 /* clone any lsm security options from the parent to the new sb */
2322 security_sb_clone_mnt_opts(data->sb, s);
2323
2324 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2325 return 0;
2326
2327 out_err_nosb:
2328 nfs_free_server(server);
2329 out_err_noserver:
2330 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2331 return error;
2332
2333 error_splat_super:
2334 deactivate_locked_super(s);
2335 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2336 return error;
2337 }
2338
2339 #ifdef CONFIG_NFS_V4
2340
2341 /*
2342 * Finish setting up a cloned NFS4 superblock
2343 */
2344 static void nfs4_clone_super(struct super_block *sb,
2345 const struct super_block *old_sb)
2346 {
2347 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2348 sb->s_blocksize = old_sb->s_blocksize;
2349 sb->s_maxbytes = old_sb->s_maxbytes;
2350 sb->s_time_gran = 1;
2351 sb->s_op = old_sb->s_op;
2352 nfs_initialise_sb(sb);
2353 }
2354
2355 /*
2356 * Set up an NFS4 superblock
2357 */
2358 static void nfs4_fill_super(struct super_block *sb)
2359 {
2360 sb->s_time_gran = 1;
2361 sb->s_op = &nfs4_sops;
2362 nfs_initialise_sb(sb);
2363 }
2364
2365 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2366 {
2367 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2368 }
2369
2370 static int nfs4_validate_text_mount_data(void *options,
2371 struct nfs_parsed_mount_data *args,
2372 const char *dev_name)
2373 {
2374 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2375
2376 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2377
2378 nfs_validate_transport_protocol(args);
2379
2380 nfs4_validate_mount_flags(args);
2381
2382 if (args->version != 4) {
2383 dfprintk(MOUNT,
2384 "NFS4: Illegal mount version\n");
2385 return -EINVAL;
2386 }
2387
2388 if (args->auth_flavor_len > 1) {
2389 dfprintk(MOUNT,
2390 "NFS4: Too many RPC auth flavours specified\n");
2391 return -EINVAL;
2392 }
2393
2394 if (args->client_address == NULL) {
2395 dfprintk(MOUNT,
2396 "NFS4: mount program didn't pass callback address\n");
2397 return -EINVAL;
2398 }
2399
2400 return nfs_parse_devname(dev_name,
2401 &args->nfs_server.hostname,
2402 NFS4_MAXNAMLEN,
2403 &args->nfs_server.export_path,
2404 NFS4_MAXPATHLEN);
2405 }
2406
2407 /*
2408 * Validate NFSv4 mount options
2409 */
2410 static int nfs4_validate_mount_data(void *options,
2411 struct nfs_parsed_mount_data *args,
2412 const char *dev_name)
2413 {
2414 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2415 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2416 char *c;
2417
2418 if (data == NULL)
2419 goto out_no_data;
2420
2421 switch (data->version) {
2422 case 1:
2423 if (data->host_addrlen > sizeof(args->nfs_server.address))
2424 goto out_no_address;
2425 if (data->host_addrlen == 0)
2426 goto out_no_address;
2427 args->nfs_server.addrlen = data->host_addrlen;
2428 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2429 return -EFAULT;
2430 if (!nfs_verify_server_address(sap))
2431 goto out_no_address;
2432
2433 if (data->auth_flavourlen) {
2434 if (data->auth_flavourlen > 1)
2435 goto out_inval_auth;
2436 if (copy_from_user(&args->auth_flavors[0],
2437 data->auth_flavours,
2438 sizeof(args->auth_flavors[0])))
2439 return -EFAULT;
2440 }
2441
2442 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2443 if (IS_ERR(c))
2444 return PTR_ERR(c);
2445 args->nfs_server.hostname = c;
2446
2447 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2448 if (IS_ERR(c))
2449 return PTR_ERR(c);
2450 args->nfs_server.export_path = c;
2451 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2452
2453 c = strndup_user(data->client_addr.data, 16);
2454 if (IS_ERR(c))
2455 return PTR_ERR(c);
2456 args->client_address = c;
2457
2458 /*
2459 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2460 * can deal with.
2461 */
2462
2463 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2464 args->rsize = data->rsize;
2465 args->wsize = data->wsize;
2466 args->timeo = data->timeo;
2467 args->retrans = data->retrans;
2468 args->acregmin = data->acregmin;
2469 args->acregmax = data->acregmax;
2470 args->acdirmin = data->acdirmin;
2471 args->acdirmax = data->acdirmax;
2472 args->nfs_server.protocol = data->proto;
2473 nfs_validate_transport_protocol(args);
2474
2475 break;
2476 default:
2477 if (nfs_parse_mount_options((char *)options, args) == 0)
2478 return -EINVAL;
2479
2480 if (!nfs_verify_server_address(sap))
2481 return -EINVAL;
2482
2483 return nfs4_validate_text_mount_data(options, args, dev_name);
2484 }
2485
2486 return 0;
2487
2488 out_no_data:
2489 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2490 return -EINVAL;
2491
2492 out_inval_auth:
2493 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2494 data->auth_flavourlen);
2495 return -EINVAL;
2496
2497 out_no_address:
2498 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2499 return -EINVAL;
2500 }
2501
2502 /*
2503 * Get the superblock for the NFS4 root partition
2504 */
2505 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2506 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2507 {
2508 struct nfs_parsed_mount_data *data = raw_data;
2509 struct super_block *s;
2510 struct nfs_server *server;
2511 struct nfs_fh *mntfh;
2512 struct dentry *mntroot;
2513 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2514 struct nfs_sb_mountdata sb_mntdata = {
2515 .mntflags = flags,
2516 };
2517 int error = -ENOMEM;
2518
2519 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2520 if (data == NULL || mntfh == NULL)
2521 goto out_free_fh;
2522
2523 security_init_mnt_opts(&data->lsm_opts);
2524
2525 /* Get a volume representation */
2526 server = nfs4_create_server(data, mntfh);
2527 if (IS_ERR(server)) {
2528 error = PTR_ERR(server);
2529 goto out;
2530 }
2531 sb_mntdata.server = server;
2532
2533 if (server->flags & NFS4_MOUNT_UNSHARED)
2534 compare_super = NULL;
2535
2536 /* Get a superblock - note that we may end up sharing one that already exists */
2537 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2538 if (IS_ERR(s)) {
2539 error = PTR_ERR(s);
2540 goto out_free;
2541 }
2542
2543 if (s->s_fs_info != server) {
2544 nfs_free_server(server);
2545 server = NULL;
2546 } else {
2547 error = nfs_bdi_register(server);
2548 if (error)
2549 goto error_splat_super;
2550 }
2551
2552 if (!s->s_root) {
2553 /* initial superblock/root creation */
2554 nfs4_fill_super(s);
2555 nfs_fscache_get_super_cookie(
2556 s, data ? data->fscache_uniq : NULL, NULL);
2557 }
2558
2559 mntroot = nfs4_get_root(s, mntfh);
2560 if (IS_ERR(mntroot)) {
2561 error = PTR_ERR(mntroot);
2562 goto error_splat_super;
2563 }
2564
2565 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2566 if (error)
2567 goto error_splat_root;
2568
2569 s->s_flags |= MS_ACTIVE;
2570 mnt->mnt_sb = s;
2571 mnt->mnt_root = mntroot;
2572 error = 0;
2573
2574 out:
2575 security_free_mnt_opts(&data->lsm_opts);
2576 out_free_fh:
2577 kfree(mntfh);
2578 return error;
2579
2580 out_free:
2581 nfs_free_server(server);
2582 goto out;
2583
2584 error_splat_root:
2585 dput(mntroot);
2586 error_splat_super:
2587 deactivate_locked_super(s);
2588 goto out;
2589 }
2590
2591 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2592 int flags, void *data, const char *hostname)
2593 {
2594 struct vfsmount *root_mnt;
2595 char *root_devname;
2596 size_t len;
2597
2598 len = strlen(hostname) + 3;
2599 root_devname = kmalloc(len, GFP_KERNEL);
2600 if (root_devname == NULL)
2601 return ERR_PTR(-ENOMEM);
2602 snprintf(root_devname, len, "%s:/", hostname);
2603 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2604 kfree(root_devname);
2605 return root_mnt;
2606 }
2607
2608 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2609 {
2610 char *page = (char *) __get_free_page(GFP_KERNEL);
2611 char *devname, *tmp;
2612
2613 if (page == NULL)
2614 return;
2615 devname = nfs_path(path->mnt->mnt_devname,
2616 path->mnt->mnt_root, path->dentry,
2617 page, PAGE_SIZE);
2618 if (devname == NULL)
2619 goto out_freepage;
2620 tmp = kstrdup(devname, GFP_KERNEL);
2621 if (tmp == NULL)
2622 goto out_freepage;
2623 kfree(mnt->mnt_devname);
2624 mnt->mnt_devname = tmp;
2625 out_freepage:
2626 free_page((unsigned long)page);
2627 }
2628
2629 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2630 const char *export_path, struct vfsmount *mnt_target)
2631 {
2632 struct mnt_namespace *ns_private;
2633 struct nameidata nd;
2634 struct super_block *s;
2635 int ret;
2636
2637 ns_private = create_mnt_ns(root_mnt);
2638 ret = PTR_ERR(ns_private);
2639 if (IS_ERR(ns_private))
2640 goto out_mntput;
2641
2642 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2643 export_path, LOOKUP_FOLLOW, &nd);
2644
2645 put_mnt_ns(ns_private);
2646
2647 if (ret != 0)
2648 goto out_err;
2649
2650 s = nd.path.mnt->mnt_sb;
2651 atomic_inc(&s->s_active);
2652 mnt_target->mnt_sb = s;
2653 mnt_target->mnt_root = dget(nd.path.dentry);
2654
2655 /* Correct the device pathname */
2656 nfs_fix_devname(&nd.path, mnt_target);
2657
2658 path_put(&nd.path);
2659 down_write(&s->s_umount);
2660 return 0;
2661 out_mntput:
2662 mntput(root_mnt);
2663 out_err:
2664 return ret;
2665 }
2666
2667 static int nfs4_try_mount(int flags, const char *dev_name,
2668 struct nfs_parsed_mount_data *data,
2669 struct vfsmount *mnt)
2670 {
2671 char *export_path;
2672 struct vfsmount *root_mnt;
2673 int error;
2674
2675 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2676
2677 export_path = data->nfs_server.export_path;
2678 data->nfs_server.export_path = "/";
2679 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2680 data->nfs_server.hostname);
2681 data->nfs_server.export_path = export_path;
2682
2683 error = PTR_ERR(root_mnt);
2684 if (IS_ERR(root_mnt))
2685 goto out;
2686
2687 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2688
2689 out:
2690 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2691 error != 0 ? " [error]" : "");
2692 return error;
2693 }
2694
2695 /*
2696 * Get the superblock for an NFS4 mountpoint
2697 */
2698 static int nfs4_get_sb(struct file_system_type *fs_type,
2699 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2700 {
2701 struct nfs_parsed_mount_data *data;
2702 int error = -ENOMEM;
2703
2704 data = nfs_alloc_parsed_mount_data(4);
2705 if (data == NULL)
2706 goto out_free_data;
2707
2708 /* Validate the mount data */
2709 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2710 if (error < 0)
2711 goto out;
2712
2713 error = nfs4_try_mount(flags, dev_name, data, mnt);
2714
2715 out:
2716 kfree(data->client_address);
2717 kfree(data->nfs_server.export_path);
2718 kfree(data->nfs_server.hostname);
2719 kfree(data->fscache_uniq);
2720 out_free_data:
2721 kfree(data);
2722 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2723 error != 0 ? " [error]" : "");
2724 return error;
2725 }
2726
2727 static void nfs4_kill_super(struct super_block *sb)
2728 {
2729 struct nfs_server *server = NFS_SB(sb);
2730
2731 dprintk("--> %s\n", __func__);
2732 nfs_super_return_all_delegations(sb);
2733 kill_anon_super(sb);
2734 nfs_fscache_release_super_cookie(sb);
2735 nfs_free_server(server);
2736 dprintk("<-- %s\n", __func__);
2737 }
2738
2739 /*
2740 * Clone an NFS4 server record on xdev traversal (FSID-change)
2741 */
2742 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2743 const char *dev_name, void *raw_data,
2744 struct vfsmount *mnt)
2745 {
2746 struct nfs_clone_mount *data = raw_data;
2747 struct super_block *s;
2748 struct nfs_server *server;
2749 struct dentry *mntroot;
2750 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2751 struct nfs_sb_mountdata sb_mntdata = {
2752 .mntflags = flags,
2753 };
2754 int error;
2755
2756 dprintk("--> nfs4_xdev_get_sb()\n");
2757
2758 /* create a new volume representation */
2759 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2760 if (IS_ERR(server)) {
2761 error = PTR_ERR(server);
2762 goto out_err_noserver;
2763 }
2764 sb_mntdata.server = server;
2765
2766 if (server->flags & NFS4_MOUNT_UNSHARED)
2767 compare_super = NULL;
2768
2769 /* Get a superblock - note that we may end up sharing one that already exists */
2770 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2771 if (IS_ERR(s)) {
2772 error = PTR_ERR(s);
2773 goto out_err_nosb;
2774 }
2775
2776 if (s->s_fs_info != server) {
2777 nfs_free_server(server);
2778 server = NULL;
2779 } else {
2780 error = nfs_bdi_register(server);
2781 if (error)
2782 goto error_splat_super;
2783 }
2784
2785 if (!s->s_root) {
2786 /* initial superblock/root creation */
2787 nfs4_clone_super(s, data->sb);
2788 nfs_fscache_get_super_cookie(s, NULL, data);
2789 }
2790
2791 mntroot = nfs4_get_root(s, data->fh);
2792 if (IS_ERR(mntroot)) {
2793 error = PTR_ERR(mntroot);
2794 goto error_splat_super;
2795 }
2796 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2797 dput(mntroot);
2798 error = -ESTALE;
2799 goto error_splat_super;
2800 }
2801
2802 s->s_flags |= MS_ACTIVE;
2803 mnt->mnt_sb = s;
2804 mnt->mnt_root = mntroot;
2805
2806 security_sb_clone_mnt_opts(data->sb, s);
2807
2808 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2809 return 0;
2810
2811 out_err_nosb:
2812 nfs_free_server(server);
2813 out_err_noserver:
2814 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2815 return error;
2816
2817 error_splat_super:
2818 deactivate_locked_super(s);
2819 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2820 return error;
2821 }
2822
2823 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2824 int flags, const char *dev_name, void *raw_data,
2825 struct vfsmount *mnt)
2826 {
2827 struct nfs_clone_mount *data = raw_data;
2828 struct super_block *s;
2829 struct nfs_server *server;
2830 struct dentry *mntroot;
2831 struct nfs_fh mntfh;
2832 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2833 struct nfs_sb_mountdata sb_mntdata = {
2834 .mntflags = flags,
2835 };
2836 int error;
2837
2838 dprintk("--> nfs4_referral_get_sb()\n");
2839
2840 /* create a new volume representation */
2841 server = nfs4_create_referral_server(data, &mntfh);
2842 if (IS_ERR(server)) {
2843 error = PTR_ERR(server);
2844 goto out_err_noserver;
2845 }
2846 sb_mntdata.server = server;
2847
2848 if (server->flags & NFS4_MOUNT_UNSHARED)
2849 compare_super = NULL;
2850
2851 /* Get a superblock - note that we may end up sharing one that already exists */
2852 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2853 if (IS_ERR(s)) {
2854 error = PTR_ERR(s);
2855 goto out_err_nosb;
2856 }
2857
2858 if (s->s_fs_info != server) {
2859 nfs_free_server(server);
2860 server = NULL;
2861 } else {
2862 error = nfs_bdi_register(server);
2863 if (error)
2864 goto error_splat_super;
2865 }
2866
2867 if (!s->s_root) {
2868 /* initial superblock/root creation */
2869 nfs4_fill_super(s);
2870 nfs_fscache_get_super_cookie(s, NULL, data);
2871 }
2872
2873 mntroot = nfs4_get_root(s, &mntfh);
2874 if (IS_ERR(mntroot)) {
2875 error = PTR_ERR(mntroot);
2876 goto error_splat_super;
2877 }
2878 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2879 dput(mntroot);
2880 error = -ESTALE;
2881 goto error_splat_super;
2882 }
2883
2884 s->s_flags |= MS_ACTIVE;
2885 mnt->mnt_sb = s;
2886 mnt->mnt_root = mntroot;
2887
2888 security_sb_clone_mnt_opts(data->sb, s);
2889
2890 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2891 return 0;
2892
2893 out_err_nosb:
2894 nfs_free_server(server);
2895 out_err_noserver:
2896 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2897 return error;
2898
2899 error_splat_super:
2900 deactivate_locked_super(s);
2901 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2902 return error;
2903 }
2904
2905 /*
2906 * Create an NFS4 server record on referral traversal
2907 */
2908 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2909 int flags, const char *dev_name, void *raw_data,
2910 struct vfsmount *mnt)
2911 {
2912 struct nfs_clone_mount *data = raw_data;
2913 char *export_path;
2914 struct vfsmount *root_mnt;
2915 int error;
2916
2917 dprintk("--> nfs4_referral_get_sb()\n");
2918
2919 export_path = data->mnt_path;
2920 data->mnt_path = "/";
2921
2922 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2923 flags, data, data->hostname);
2924 data->mnt_path = export_path;
2925
2926 error = PTR_ERR(root_mnt);
2927 if (IS_ERR(root_mnt))
2928 goto out;
2929
2930 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2931 out:
2932 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2933 error != 0 ? " [error]" : "");
2934 return error;
2935 }
2936
2937 MODULE_ALIAS("nfs4");
2938
2939 #endif /* CONFIG_NFS_V4 */
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