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[ARM] pxa: update defconfig for Verdex Pro
[linux-2.6/verdex.git] / fs / nfs / super.c
bloba2c18acb856837f157a9e871fe1e511abc0911cc
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_kill_super(struct super_block *);
245 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
246
247 static struct file_system_type nfs_fs_type = {
248 .owner = THIS_MODULE,
249 .name = "nfs",
250 .get_sb = nfs_get_sb,
251 .kill_sb = nfs_kill_super,
252 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
253 };
254
255 struct file_system_type nfs_xdev_fs_type = {
256 .owner = THIS_MODULE,
257 .name = "nfs",
258 .get_sb = nfs_xdev_get_sb,
259 .kill_sb = nfs_kill_super,
260 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
261 };
262
263 static const struct super_operations nfs_sops = {
264 .alloc_inode = nfs_alloc_inode,
265 .destroy_inode = nfs_destroy_inode,
266 .write_inode = nfs_write_inode,
267 .statfs = nfs_statfs,
268 .clear_inode = nfs_clear_inode,
269 .umount_begin = nfs_umount_begin,
270 .show_options = nfs_show_options,
271 .show_stats = nfs_show_stats,
272 .remount_fs = nfs_remount,
273 };
274
275 #ifdef CONFIG_NFS_V4
276 static int nfs4_validate_text_mount_data(void *options,
277 struct nfs_parsed_mount_data *args, const char *dev_name);
278 static int nfs4_try_mount(int flags, const char *dev_name,
279 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
280 static int nfs4_get_sb(struct file_system_type *fs_type,
281 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
282 static int nfs4_remote_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_xdev_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_referral_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_remote_referral_get_sb(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
290 static void nfs4_kill_super(struct super_block *sb);
291
292 static struct file_system_type nfs4_fs_type = {
293 .owner = THIS_MODULE,
294 .name = "nfs4",
295 .get_sb = nfs4_get_sb,
296 .kill_sb = nfs4_kill_super,
297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
298 };
299
300 static struct file_system_type nfs4_remote_fs_type = {
301 .owner = THIS_MODULE,
302 .name = "nfs4",
303 .get_sb = nfs4_remote_get_sb,
304 .kill_sb = nfs4_kill_super,
305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
306 };
307
308 struct file_system_type nfs4_xdev_fs_type = {
309 .owner = THIS_MODULE,
310 .name = "nfs4",
311 .get_sb = nfs4_xdev_get_sb,
312 .kill_sb = nfs4_kill_super,
313 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
314 };
315
316 static struct file_system_type nfs4_remote_referral_fs_type = {
317 .owner = THIS_MODULE,
318 .name = "nfs4",
319 .get_sb = nfs4_remote_referral_get_sb,
320 .kill_sb = nfs4_kill_super,
321 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
322 };
323
324 struct file_system_type nfs4_referral_fs_type = {
325 .owner = THIS_MODULE,
326 .name = "nfs4",
327 .get_sb = nfs4_referral_get_sb,
328 .kill_sb = nfs4_kill_super,
329 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
330 };
331
332 static const struct super_operations nfs4_sops = {
333 .alloc_inode = nfs_alloc_inode,
334 .destroy_inode = nfs_destroy_inode,
335 .write_inode = nfs_write_inode,
336 .statfs = nfs_statfs,
337 .clear_inode = nfs4_clear_inode,
338 .umount_begin = nfs_umount_begin,
339 .show_options = nfs_show_options,
340 .show_stats = nfs_show_stats,
341 .remount_fs = nfs_remount,
342 };
343 #endif
344
345 static struct shrinker acl_shrinker = {
346 .shrink = nfs_access_cache_shrinker,
347 .seeks = DEFAULT_SEEKS,
348 };
349
350 /*
351 * Register the NFS filesystems
352 */
353 int __init register_nfs_fs(void)
354 {
355 int ret;
356
357 ret = register_filesystem(&nfs_fs_type);
358 if (ret < 0)
359 goto error_0;
360
361 ret = nfs_register_sysctl();
362 if (ret < 0)
363 goto error_1;
364 #ifdef CONFIG_NFS_V4
365 ret = register_filesystem(&nfs4_fs_type);
366 if (ret < 0)
367 goto error_2;
368 #endif
369 register_shrinker(&acl_shrinker);
370 return 0;
371
372 #ifdef CONFIG_NFS_V4
373 error_2:
374 nfs_unregister_sysctl();
375 #endif
376 error_1:
377 unregister_filesystem(&nfs_fs_type);
378 error_0:
379 return ret;
380 }
381
382 /*
383 * Unregister the NFS filesystems
384 */
385 void __exit unregister_nfs_fs(void)
386 {
387 unregister_shrinker(&acl_shrinker);
388 #ifdef CONFIG_NFS_V4
389 unregister_filesystem(&nfs4_fs_type);
390 #endif
391 nfs_unregister_sysctl();
392 unregister_filesystem(&nfs_fs_type);
393 }
394
395 void nfs_sb_active(struct super_block *sb)
396 {
397 struct nfs_server *server = NFS_SB(sb);
398
399 if (atomic_inc_return(&server->active) == 1)
400 atomic_inc(&sb->s_active);
401 }
402
403 void nfs_sb_deactive(struct super_block *sb)
404 {
405 struct nfs_server *server = NFS_SB(sb);
406
407 if (atomic_dec_and_test(&server->active))
408 deactivate_super(sb);
409 }
410
411 /*
412 * Deliver file system statistics to userspace
413 */
414 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
415 {
416 struct nfs_server *server = NFS_SB(dentry->d_sb);
417 unsigned char blockbits;
418 unsigned long blockres;
419 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
420 struct nfs_fattr fattr;
421 struct nfs_fsstat res = {
422 .fattr = &fattr,
423 };
424 int error;
425
426 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
427 if (error < 0)
428 goto out_err;
429 buf->f_type = NFS_SUPER_MAGIC;
430
431 /*
432 * Current versions of glibc do not correctly handle the
433 * case where f_frsize != f_bsize. Eventually we want to
434 * report the value of wtmult in this field.
435 */
436 buf->f_frsize = dentry->d_sb->s_blocksize;
437
438 /*
439 * On most *nix systems, f_blocks, f_bfree, and f_bavail
440 * are reported in units of f_frsize. Linux hasn't had
441 * an f_frsize field in its statfs struct until recently,
442 * thus historically Linux's sys_statfs reports these
443 * fields in units of f_bsize.
444 */
445 buf->f_bsize = dentry->d_sb->s_blocksize;
446 blockbits = dentry->d_sb->s_blocksize_bits;
447 blockres = (1 << blockbits) - 1;
448 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
449 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
450 buf->f_bavail = (res.abytes + blockres) >> blockbits;
451
452 buf->f_files = res.tfiles;
453 buf->f_ffree = res.afiles;
454
455 buf->f_namelen = server->namelen;
456
457 return 0;
458
459 out_err:
460 dprintk("%s: statfs error = %d\n", __func__, -error);
461 return error;
462 }
463
464 /*
465 * Map the security flavour number to a name
466 */
467 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
468 {
469 static const struct {
470 rpc_authflavor_t flavour;
471 const char *str;
472 } sec_flavours[] = {
473 { RPC_AUTH_NULL, "null" },
474 { RPC_AUTH_UNIX, "sys" },
475 { RPC_AUTH_GSS_KRB5, "krb5" },
476 { RPC_AUTH_GSS_KRB5I, "krb5i" },
477 { RPC_AUTH_GSS_KRB5P, "krb5p" },
478 { RPC_AUTH_GSS_LKEY, "lkey" },
479 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
480 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
481 { RPC_AUTH_GSS_SPKM, "spkm" },
482 { RPC_AUTH_GSS_SPKMI, "spkmi" },
483 { RPC_AUTH_GSS_SPKMP, "spkmp" },
484 { UINT_MAX, "unknown" }
485 };
486 int i;
487
488 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
489 if (sec_flavours[i].flavour == flavour)
490 break;
491 }
492 return sec_flavours[i].str;
493 }
494
495 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
496 int showdefaults)
497 {
498 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
499
500 switch (sap->sa_family) {
501 case AF_INET: {
502 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
503 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
504 break;
505 }
506 case AF_INET6: {
507 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
508 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
509 break;
510 }
511 default:
512 if (showdefaults)
513 seq_printf(m, ",mountaddr=unspecified");
514 }
515
516 if (nfss->mountd_version || showdefaults)
517 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
518 if (nfss->mountd_port || showdefaults)
519 seq_printf(m, ",mountport=%u", nfss->mountd_port);
520
521 switch (nfss->mountd_protocol) {
522 case IPPROTO_UDP:
523 seq_printf(m, ",mountproto=udp");
524 break;
525 case IPPROTO_TCP:
526 seq_printf(m, ",mountproto=tcp");
527 break;
528 default:
529 if (showdefaults)
530 seq_printf(m, ",mountproto=auto");
531 }
532 }
533
534 /*
535 * Describe the mount options in force on this server representation
536 */
537 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
538 int showdefaults)
539 {
540 static const struct proc_nfs_info {
541 int flag;
542 const char *str;
543 const char *nostr;
544 } nfs_info[] = {
545 { NFS_MOUNT_SOFT, ",soft", ",hard" },
546 { NFS_MOUNT_POSIX, ",posix", "" },
547 { NFS_MOUNT_NOCTO, ",nocto", "" },
548 { NFS_MOUNT_NOAC, ",noac", "" },
549 { NFS_MOUNT_NONLM, ",nolock", "" },
550 { NFS_MOUNT_NOACL, ",noacl", "" },
551 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
552 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
553 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
554 { 0, NULL, NULL }
555 };
556 const struct proc_nfs_info *nfs_infop;
557 struct nfs_client *clp = nfss->nfs_client;
558 u32 version = clp->rpc_ops->version;
559
560 seq_printf(m, ",vers=%u", version);
561 seq_printf(m, ",rsize=%u", nfss->rsize);
562 seq_printf(m, ",wsize=%u", nfss->wsize);
563 if (nfss->bsize != 0)
564 seq_printf(m, ",bsize=%u", nfss->bsize);
565 seq_printf(m, ",namlen=%u", nfss->namelen);
566 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
567 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
568 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
569 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
570 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
571 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
572 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
573 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
574 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
575 if (nfss->flags & nfs_infop->flag)
576 seq_puts(m, nfs_infop->str);
577 else
578 seq_puts(m, nfs_infop->nostr);
579 }
580 seq_printf(m, ",proto=%s",
581 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
582 if (version == 4) {
583 if (nfss->port != NFS_PORT)
584 seq_printf(m, ",port=%u", nfss->port);
585 } else
586 if (nfss->port)
587 seq_printf(m, ",port=%u", nfss->port);
588
589 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
590 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
591 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
592
593 if (version != 4)
594 nfs_show_mountd_options(m, nfss, showdefaults);
595
596 #ifdef CONFIG_NFS_V4
597 if (clp->rpc_ops->version == 4)
598 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
599 #endif
600 if (nfss->options & NFS_OPTION_FSCACHE)
601 seq_printf(m, ",fsc");
602 }
603
604 /*
605 * Describe the mount options on this VFS mountpoint
606 */
607 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
608 {
609 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
610
611 nfs_show_mount_options(m, nfss, 0);
612
613 seq_printf(m, ",addr=%s",
614 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
615 RPC_DISPLAY_ADDR));
616
617 return 0;
618 }
619
620 /*
621 * Present statistical information for this VFS mountpoint
622 */
623 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
624 {
625 int i, cpu;
626 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
627 struct rpc_auth *auth = nfss->client->cl_auth;
628 struct nfs_iostats totals = { };
629
630 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
631
632 /*
633 * Display all mount option settings
634 */
635 seq_printf(m, "\n\topts:\t");
636 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
637 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
638 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
639 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
640 nfs_show_mount_options(m, nfss, 1);
641
642 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
643
644 seq_printf(m, "\n\tcaps:\t");
645 seq_printf(m, "caps=0x%x", nfss->caps);
646 seq_printf(m, ",wtmult=%u", nfss->wtmult);
647 seq_printf(m, ",dtsize=%u", nfss->dtsize);
648 seq_printf(m, ",bsize=%u", nfss->bsize);
649 seq_printf(m, ",namlen=%u", nfss->namelen);
650
651 #ifdef CONFIG_NFS_V4
652 if (nfss->nfs_client->rpc_ops->version == 4) {
653 seq_printf(m, "\n\tnfsv4:\t");
654 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
655 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
656 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
657 }
658 #endif
659
660 /*
661 * Display security flavor in effect for this mount
662 */
663 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
664 if (auth->au_flavor)
665 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
666
667 /*
668 * Display superblock I/O counters
669 */
670 for_each_possible_cpu(cpu) {
671 struct nfs_iostats *stats;
672
673 preempt_disable();
674 stats = per_cpu_ptr(nfss->io_stats, cpu);
675
676 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
677 totals.events[i] += stats->events[i];
678 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
679 totals.bytes[i] += stats->bytes[i];
680 #ifdef CONFIG_NFS_FSCACHE
681 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
682 totals.fscache[i] += stats->fscache[i];
683 #endif
684
685 preempt_enable();
686 }
687
688 seq_printf(m, "\n\tevents:\t");
689 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
690 seq_printf(m, "%lu ", totals.events[i]);
691 seq_printf(m, "\n\tbytes:\t");
692 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
693 seq_printf(m, "%Lu ", totals.bytes[i]);
694 #ifdef CONFIG_NFS_FSCACHE
695 if (nfss->options & NFS_OPTION_FSCACHE) {
696 seq_printf(m, "\n\tfsc:\t");
697 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
698 seq_printf(m, "%Lu ", totals.bytes[i]);
699 }
700 #endif
701 seq_printf(m, "\n");
702
703 rpc_print_iostats(m, nfss->client);
704
705 return 0;
706 }
707
708 /*
709 * Begin unmount by attempting to remove all automounted mountpoints we added
710 * in response to xdev traversals and referrals
711 */
712 static void nfs_umount_begin(struct super_block *sb)
713 {
714 struct nfs_server *server;
715 struct rpc_clnt *rpc;
716
717 lock_kernel();
718
719 server = NFS_SB(sb);
720 /* -EIO all pending I/O */
721 rpc = server->client_acl;
722 if (!IS_ERR(rpc))
723 rpc_killall_tasks(rpc);
724 rpc = server->client;
725 if (!IS_ERR(rpc))
726 rpc_killall_tasks(rpc);
727
728 unlock_kernel();
729 }
730
731 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
732 {
733 struct nfs_parsed_mount_data *data;
734
735 data = kzalloc(sizeof(*data), GFP_KERNEL);
736 if (data) {
737 data->rsize = NFS_MAX_FILE_IO_SIZE;
738 data->wsize = NFS_MAX_FILE_IO_SIZE;
739 data->acregmin = NFS_DEF_ACREGMIN;
740 data->acregmax = NFS_DEF_ACREGMAX;
741 data->acdirmin = NFS_DEF_ACDIRMIN;
742 data->acdirmax = NFS_DEF_ACDIRMAX;
743 data->mount_server.port = NFS_UNSPEC_PORT;
744 data->nfs_server.port = NFS_UNSPEC_PORT;
745 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
746 data->auth_flavors[0] = RPC_AUTH_UNIX;
747 data->auth_flavor_len = 1;
748 data->version = version;
749 data->minorversion = 0;
750 }
751 return data;
752 }
753
754 /*
755 * Sanity-check a server address provided by the mount command.
756 *
757 * Address family must be initialized, and address must not be
758 * the ANY address for that family.
759 */
760 static int nfs_verify_server_address(struct sockaddr *addr)
761 {
762 switch (addr->sa_family) {
763 case AF_INET: {
764 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
765 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
766 }
767 case AF_INET6: {
768 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
769 return !ipv6_addr_any(sa);
770 }
771 }
772
773 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
774 return 0;
775 }
776
777 /*
778 * Select between a default port value and a user-specified port value.
779 * If a zero value is set, then autobind will be used.
780 */
781 static void nfs_set_port(struct sockaddr *sap, int *port,
782 const unsigned short default_port)
783 {
784 if (*port == NFS_UNSPEC_PORT)
785 *port = default_port;
786
787 rpc_set_port(sap, *port);
788 }
789
790 /*
791 * Sanity check the NFS transport protocol.
792 *
793 */
794 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
795 {
796 switch (mnt->nfs_server.protocol) {
797 case XPRT_TRANSPORT_UDP:
798 case XPRT_TRANSPORT_TCP:
799 case XPRT_TRANSPORT_RDMA:
800 break;
801 default:
802 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
803 }
804 }
805
806 /*
807 * For text based NFSv2/v3 mounts, the mount protocol transport default
808 * settings should depend upon the specified NFS transport.
809 */
810 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
811 {
812 nfs_validate_transport_protocol(mnt);
813
814 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
815 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
816 return;
817 switch (mnt->nfs_server.protocol) {
818 case XPRT_TRANSPORT_UDP:
819 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
820 break;
821 case XPRT_TRANSPORT_TCP:
822 case XPRT_TRANSPORT_RDMA:
823 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
824 }
825 }
826
827 /*
828 * Parse the value of the 'sec=' option.
829 */
830 static int nfs_parse_security_flavors(char *value,
831 struct nfs_parsed_mount_data *mnt)
832 {
833 substring_t args[MAX_OPT_ARGS];
834
835 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
836
837 switch (match_token(value, nfs_secflavor_tokens, args)) {
838 case Opt_sec_none:
839 mnt->auth_flavors[0] = RPC_AUTH_NULL;
840 break;
841 case Opt_sec_sys:
842 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
843 break;
844 case Opt_sec_krb5:
845 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
846 break;
847 case Opt_sec_krb5i:
848 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
849 break;
850 case Opt_sec_krb5p:
851 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
852 break;
853 case Opt_sec_lkey:
854 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
855 break;
856 case Opt_sec_lkeyi:
857 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
858 break;
859 case Opt_sec_lkeyp:
860 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
861 break;
862 case Opt_sec_spkm:
863 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
864 break;
865 case Opt_sec_spkmi:
866 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
867 break;
868 case Opt_sec_spkmp:
869 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
870 break;
871 default:
872 return 0;
873 }
874
875 mnt->auth_flavor_len = 1;
876 return 1;
877 }
878
879 /*
880 * Error-check and convert a string of mount options from user space into
881 * a data structure. The whole mount string is processed; bad options are
882 * skipped as they are encountered. If there were no errors, return 1;
883 * otherwise return 0 (zero).
884 */
885 static int nfs_parse_mount_options(char *raw,
886 struct nfs_parsed_mount_data *mnt)
887 {
888 char *p, *string, *secdata;
889 int rc, sloppy = 0, invalid_option = 0;
890
891 if (!raw) {
892 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
893 return 1;
894 }
895 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
896
897 secdata = alloc_secdata();
898 if (!secdata)
899 goto out_nomem;
900
901 rc = security_sb_copy_data(raw, secdata);
902 if (rc)
903 goto out_security_failure;
904
905 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
906 if (rc)
907 goto out_security_failure;
908
909 free_secdata(secdata);
910
911 while ((p = strsep(&raw, ",")) != NULL) {
912 substring_t args[MAX_OPT_ARGS];
913 unsigned long option;
914 int token;
915
916 if (!*p)
917 continue;
918
919 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
920
921 token = match_token(p, nfs_mount_option_tokens, args);
922 switch (token) {
923
924 /*
925 * boolean options: foo/nofoo
926 */
927 case Opt_soft:
928 mnt->flags |= NFS_MOUNT_SOFT;
929 break;
930 case Opt_hard:
931 mnt->flags &= ~NFS_MOUNT_SOFT;
932 break;
933 case Opt_posix:
934 mnt->flags |= NFS_MOUNT_POSIX;
935 break;
936 case Opt_noposix:
937 mnt->flags &= ~NFS_MOUNT_POSIX;
938 break;
939 case Opt_cto:
940 mnt->flags &= ~NFS_MOUNT_NOCTO;
941 break;
942 case Opt_nocto:
943 mnt->flags |= NFS_MOUNT_NOCTO;
944 break;
945 case Opt_ac:
946 mnt->flags &= ~NFS_MOUNT_NOAC;
947 break;
948 case Opt_noac:
949 mnt->flags |= NFS_MOUNT_NOAC;
950 break;
951 case Opt_lock:
952 mnt->flags &= ~NFS_MOUNT_NONLM;
953 break;
954 case Opt_nolock:
955 mnt->flags |= NFS_MOUNT_NONLM;
956 break;
957 case Opt_v2:
958 mnt->flags &= ~NFS_MOUNT_VER3;
959 mnt->version = 2;
960 break;
961 case Opt_v3:
962 mnt->flags |= NFS_MOUNT_VER3;
963 mnt->version = 3;
964 break;
965 #ifdef CONFIG_NFS_V4
966 case Opt_v4:
967 mnt->flags &= ~NFS_MOUNT_VER3;
968 mnt->version = 4;
969 break;
970 #endif
971 case Opt_udp:
972 mnt->flags &= ~NFS_MOUNT_TCP;
973 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
974 break;
975 case Opt_tcp:
976 mnt->flags |= NFS_MOUNT_TCP;
977 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
978 break;
979 case Opt_rdma:
980 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
981 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
982 xprt_load_transport(p);
983 break;
984 case Opt_acl:
985 mnt->flags &= ~NFS_MOUNT_NOACL;
986 break;
987 case Opt_noacl:
988 mnt->flags |= NFS_MOUNT_NOACL;
989 break;
990 case Opt_rdirplus:
991 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
992 break;
993 case Opt_nordirplus:
994 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
995 break;
996 case Opt_sharecache:
997 mnt->flags &= ~NFS_MOUNT_UNSHARED;
998 break;
999 case Opt_nosharecache:
1000 mnt->flags |= NFS_MOUNT_UNSHARED;
1001 break;
1002 case Opt_resvport:
1003 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1004 break;
1005 case Opt_noresvport:
1006 mnt->flags |= NFS_MOUNT_NORESVPORT;
1007 break;
1008 case Opt_fscache:
1009 mnt->options |= NFS_OPTION_FSCACHE;
1010 kfree(mnt->fscache_uniq);
1011 mnt->fscache_uniq = NULL;
1012 break;
1013 case Opt_nofscache:
1014 mnt->options &= ~NFS_OPTION_FSCACHE;
1015 kfree(mnt->fscache_uniq);
1016 mnt->fscache_uniq = NULL;
1017 break;
1018 case Opt_fscache_uniq:
1019 string = match_strdup(args);
1020 if (!string)
1021 goto out_nomem;
1022 kfree(mnt->fscache_uniq);
1023 mnt->fscache_uniq = string;
1024 mnt->options |= NFS_OPTION_FSCACHE;
1025 break;
1026
1027 /*
1028 * options that take numeric values
1029 */
1030 case Opt_port:
1031 string = match_strdup(args);
1032 if (string == NULL)
1033 goto out_nomem;
1034 rc = strict_strtoul(string, 10, &option);
1035 kfree(string);
1036 if (rc != 0 || option > USHORT_MAX)
1037 goto out_invalid_value;
1038 mnt->nfs_server.port = option;
1039 break;
1040 case Opt_rsize:
1041 string = match_strdup(args);
1042 if (string == NULL)
1043 goto out_nomem;
1044 rc = strict_strtoul(string, 10, &option);
1045 kfree(string);
1046 if (rc != 0)
1047 goto out_invalid_value;
1048 mnt->rsize = option;
1049 break;
1050 case Opt_wsize:
1051 string = match_strdup(args);
1052 if (string == NULL)
1053 goto out_nomem;
1054 rc = strict_strtoul(string, 10, &option);
1055 kfree(string);
1056 if (rc != 0)
1057 goto out_invalid_value;
1058 mnt->wsize = option;
1059 break;
1060 case Opt_bsize:
1061 string = match_strdup(args);
1062 if (string == NULL)
1063 goto out_nomem;
1064 rc = strict_strtoul(string, 10, &option);
1065 kfree(string);
1066 if (rc != 0)
1067 goto out_invalid_value;
1068 mnt->bsize = option;
1069 break;
1070 case Opt_timeo:
1071 string = match_strdup(args);
1072 if (string == NULL)
1073 goto out_nomem;
1074 rc = strict_strtoul(string, 10, &option);
1075 kfree(string);
1076 if (rc != 0 || option == 0)
1077 goto out_invalid_value;
1078 mnt->timeo = option;
1079 break;
1080 case Opt_retrans:
1081 string = match_strdup(args);
1082 if (string == NULL)
1083 goto out_nomem;
1084 rc = strict_strtoul(string, 10, &option);
1085 kfree(string);
1086 if (rc != 0 || option == 0)
1087 goto out_invalid_value;
1088 mnt->retrans = option;
1089 break;
1090 case Opt_acregmin:
1091 string = match_strdup(args);
1092 if (string == NULL)
1093 goto out_nomem;
1094 rc = strict_strtoul(string, 10, &option);
1095 kfree(string);
1096 if (rc != 0)
1097 goto out_invalid_value;
1098 mnt->acregmin = option;
1099 break;
1100 case Opt_acregmax:
1101 string = match_strdup(args);
1102 if (string == NULL)
1103 goto out_nomem;
1104 rc = strict_strtoul(string, 10, &option);
1105 kfree(string);
1106 if (rc != 0)
1107 goto out_invalid_value;
1108 mnt->acregmax = option;
1109 break;
1110 case Opt_acdirmin:
1111 string = match_strdup(args);
1112 if (string == NULL)
1113 goto out_nomem;
1114 rc = strict_strtoul(string, 10, &option);
1115 kfree(string);
1116 if (rc != 0)
1117 goto out_invalid_value;
1118 mnt->acdirmin = option;
1119 break;
1120 case Opt_acdirmax:
1121 string = match_strdup(args);
1122 if (string == NULL)
1123 goto out_nomem;
1124 rc = strict_strtoul(string, 10, &option);
1125 kfree(string);
1126 if (rc != 0)
1127 goto out_invalid_value;
1128 mnt->acdirmax = option;
1129 break;
1130 case Opt_actimeo:
1131 string = match_strdup(args);
1132 if (string == NULL)
1133 goto out_nomem;
1134 rc = strict_strtoul(string, 10, &option);
1135 kfree(string);
1136 if (rc != 0)
1137 goto out_invalid_value;
1138 mnt->acregmin = mnt->acregmax =
1139 mnt->acdirmin = mnt->acdirmax = option;
1140 break;
1141 case Opt_namelen:
1142 string = match_strdup(args);
1143 if (string == NULL)
1144 goto out_nomem;
1145 rc = strict_strtoul(string, 10, &option);
1146 kfree(string);
1147 if (rc != 0)
1148 goto out_invalid_value;
1149 mnt->namlen = option;
1150 break;
1151 case Opt_mountport:
1152 string = match_strdup(args);
1153 if (string == NULL)
1154 goto out_nomem;
1155 rc = strict_strtoul(string, 10, &option);
1156 kfree(string);
1157 if (rc != 0 || option > USHORT_MAX)
1158 goto out_invalid_value;
1159 mnt->mount_server.port = option;
1160 break;
1161 case Opt_mountvers:
1162 string = match_strdup(args);
1163 if (string == NULL)
1164 goto out_nomem;
1165 rc = strict_strtoul(string, 10, &option);
1166 kfree(string);
1167 if (rc != 0 ||
1168 option < NFS_MNT_VERSION ||
1169 option > NFS_MNT3_VERSION)
1170 goto out_invalid_value;
1171 mnt->mount_server.version = option;
1172 break;
1173 case Opt_nfsvers:
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)
1180 goto out_invalid_value;
1181 switch (option) {
1182 case NFS2_VERSION:
1183 mnt->flags &= ~NFS_MOUNT_VER3;
1184 mnt->version = 2;
1185 break;
1186 case NFS3_VERSION:
1187 mnt->flags |= NFS_MOUNT_VER3;
1188 mnt->version = 3;
1189 break;
1190 #ifdef CONFIG_NFS_V4
1191 case NFS4_VERSION:
1192 mnt->flags &= ~NFS_MOUNT_VER3;
1193 mnt->version = 4;
1194 break;
1195 #endif
1196 default:
1197 goto out_invalid_value;
1198 }
1199 break;
1200 case Opt_minorversion:
1201 string = match_strdup(args);
1202 if (string == NULL)
1203 goto out_nomem;
1204 rc = strict_strtoul(string, 10, &option);
1205 kfree(string);
1206 if (rc != 0)
1207 goto out_invalid_value;
1208 if (option > NFS4_MAX_MINOR_VERSION)
1209 goto out_invalid_value;
1210 mnt->minorversion = option;
1211 break;
1212
1213 /*
1214 * options that take text values
1215 */
1216 case Opt_sec:
1217 string = match_strdup(args);
1218 if (string == NULL)
1219 goto out_nomem;
1220 rc = nfs_parse_security_flavors(string, mnt);
1221 kfree(string);
1222 if (!rc) {
1223 dfprintk(MOUNT, "NFS: unrecognized "
1224 "security flavor\n");
1225 return 0;
1226 }
1227 break;
1228 case Opt_proto:
1229 string = match_strdup(args);
1230 if (string == NULL)
1231 goto out_nomem;
1232 token = match_token(string,
1233 nfs_xprt_protocol_tokens, args);
1234
1235 switch (token) {
1236 case Opt_xprt_udp:
1237 mnt->flags &= ~NFS_MOUNT_TCP;
1238 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1239 kfree(string);
1240 break;
1241 case Opt_xprt_tcp:
1242 mnt->flags |= NFS_MOUNT_TCP;
1243 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1244 kfree(string);
1245 break;
1246 case Opt_xprt_rdma:
1247 /* vector side protocols to TCP */
1248 mnt->flags |= NFS_MOUNT_TCP;
1249 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1250 xprt_load_transport(string);
1251 kfree(string);
1252 break;
1253 default:
1254 dfprintk(MOUNT, "NFS: unrecognized "
1255 "transport protocol\n");
1256 return 0;
1257 }
1258 break;
1259 case Opt_mountproto:
1260 string = match_strdup(args);
1261 if (string == NULL)
1262 goto out_nomem;
1263 token = match_token(string,
1264 nfs_xprt_protocol_tokens, args);
1265 kfree(string);
1266
1267 switch (token) {
1268 case Opt_xprt_udp:
1269 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1270 break;
1271 case Opt_xprt_tcp:
1272 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1273 break;
1274 case Opt_xprt_rdma: /* not used for side protocols */
1275 default:
1276 dfprintk(MOUNT, "NFS: unrecognized "
1277 "transport protocol\n");
1278 return 0;
1279 }
1280 break;
1281 case Opt_addr:
1282 string = match_strdup(args);
1283 if (string == NULL)
1284 goto out_nomem;
1285 mnt->nfs_server.addrlen =
1286 rpc_pton(string, strlen(string),
1287 (struct sockaddr *)
1288 &mnt->nfs_server.address,
1289 sizeof(mnt->nfs_server.address));
1290 kfree(string);
1291 if (mnt->nfs_server.addrlen == 0)
1292 goto out_invalid_address;
1293 break;
1294 case Opt_clientaddr:
1295 string = match_strdup(args);
1296 if (string == NULL)
1297 goto out_nomem;
1298 kfree(mnt->client_address);
1299 mnt->client_address = string;
1300 break;
1301 case Opt_mounthost:
1302 string = match_strdup(args);
1303 if (string == NULL)
1304 goto out_nomem;
1305 kfree(mnt->mount_server.hostname);
1306 mnt->mount_server.hostname = string;
1307 break;
1308 case Opt_mountaddr:
1309 string = match_strdup(args);
1310 if (string == NULL)
1311 goto out_nomem;
1312 mnt->mount_server.addrlen =
1313 rpc_pton(string, strlen(string),
1314 (struct sockaddr *)
1315 &mnt->mount_server.address,
1316 sizeof(mnt->mount_server.address));
1317 kfree(string);
1318 if (mnt->mount_server.addrlen == 0)
1319 goto out_invalid_address;
1320 break;
1321 case Opt_lookupcache:
1322 string = match_strdup(args);
1323 if (string == NULL)
1324 goto out_nomem;
1325 token = match_token(string,
1326 nfs_lookupcache_tokens, args);
1327 kfree(string);
1328 switch (token) {
1329 case Opt_lookupcache_all:
1330 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1331 break;
1332 case Opt_lookupcache_positive:
1333 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1334 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1335 break;
1336 case Opt_lookupcache_none:
1337 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1338 break;
1339 default:
1340 dfprintk(MOUNT, "NFS: invalid "
1341 "lookupcache argument\n");
1342 return 0;
1343 };
1344 break;
1345
1346 /*
1347 * Special options
1348 */
1349 case Opt_sloppy:
1350 sloppy = 1;
1351 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1352 break;
1353 case Opt_userspace:
1354 case Opt_deprecated:
1355 dfprintk(MOUNT, "NFS: ignoring mount option "
1356 "'%s'\n", p);
1357 break;
1358
1359 default:
1360 invalid_option = 1;
1361 dfprintk(MOUNT, "NFS: unrecognized mount option "
1362 "'%s'\n", p);
1363 }
1364 }
1365
1366 if (!sloppy && invalid_option)
1367 return 0;
1368
1369 return 1;
1370
1371 out_invalid_address:
1372 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1373 return 0;
1374 out_invalid_value:
1375 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1376 return 0;
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 * Match the requested auth flavors with the list returned by
1388 * the server. Returns zero and sets the mount's authentication
1389 * flavor on success; returns -EACCES if server does not support
1390 * the requested flavor.
1391 */
1392 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1393 struct nfs_mount_request *request)
1394 {
1395 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1396
1397 /*
1398 * Certain releases of Linux's mountd return an empty
1399 * flavor list. To prevent behavioral regression with
1400 * these servers (ie. rejecting mounts that used to
1401 * succeed), revert to pre-2.6.32 behavior (no checking)
1402 * if the returned flavor list is empty.
1403 */
1404 if (server_authlist_len == 0)
1405 return 0;
1406
1407 /*
1408 * We avoid sophisticated negotiating here, as there are
1409 * plenty of cases where we can get it wrong, providing
1410 * either too little or too much security.
1411 *
1412 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1413 * flavor listed first. However, some servers list
1414 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1415 * preferred default, in args->auth_flavors[0] if user
1416 * didn't specify sec= mount option.
1417 */
1418 for (i = 0; i < args->auth_flavor_len; i++)
1419 for (j = 0; j < server_authlist_len; j++)
1420 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1421 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1422 request->auth_flavs[j]);
1423 args->auth_flavors[0] = request->auth_flavs[j];
1424 return 0;
1425 }
1426
1427 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1428 nfs_umount(request);
1429 return -EACCES;
1430 }
1431
1432 /*
1433 * Use the remote server's MOUNT service to request the NFS file handle
1434 * corresponding to the provided path.
1435 */
1436 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1437 struct nfs_fh *root_fh)
1438 {
1439 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1440 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1441 struct nfs_mount_request request = {
1442 .sap = (struct sockaddr *)
1443 &args->mount_server.address,
1444 .dirpath = args->nfs_server.export_path,
1445 .protocol = args->mount_server.protocol,
1446 .fh = root_fh,
1447 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1448 .auth_flav_len = &server_authlist_len,
1449 .auth_flavs = server_authlist,
1450 };
1451 int status;
1452
1453 if (args->mount_server.version == 0) {
1454 switch (args->version) {
1455 default:
1456 args->mount_server.version = NFS_MNT3_VERSION;
1457 break;
1458 case 2:
1459 args->mount_server.version = NFS_MNT_VERSION;
1460 }
1461 }
1462 request.version = args->mount_server.version;
1463
1464 if (args->mount_server.hostname)
1465 request.hostname = args->mount_server.hostname;
1466 else
1467 request.hostname = args->nfs_server.hostname;
1468
1469 /*
1470 * Construct the mount server's address.
1471 */
1472 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1473 memcpy(request.sap, &args->nfs_server.address,
1474 args->nfs_server.addrlen);
1475 args->mount_server.addrlen = args->nfs_server.addrlen;
1476 }
1477 request.salen = args->mount_server.addrlen;
1478 nfs_set_port(request.sap, &args->mount_server.port, 0);
1479
1480 /*
1481 * Now ask the mount server to map our export path
1482 * to a file handle.
1483 */
1484 status = nfs_mount(&request);
1485 if (status != 0) {
1486 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1487 request.hostname, status);
1488 return status;
1489 }
1490
1491 /*
1492 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1493 */
1494 if (args->mount_server.version != NFS_MNT3_VERSION)
1495 return 0;
1496 return nfs_walk_authlist(args, &request);
1497 }
1498
1499 static int nfs_parse_simple_hostname(const char *dev_name,
1500 char **hostname, size_t maxnamlen,
1501 char **export_path, size_t maxpathlen)
1502 {
1503 size_t len;
1504 char *colon, *comma;
1505
1506 colon = strchr(dev_name, ':');
1507 if (colon == NULL)
1508 goto out_bad_devname;
1509
1510 len = colon - dev_name;
1511 if (len > maxnamlen)
1512 goto out_hostname;
1513
1514 /* N.B. caller will free nfs_server.hostname in all cases */
1515 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1516 if (!*hostname)
1517 goto out_nomem;
1518
1519 /* kill possible hostname list: not supported */
1520 comma = strchr(*hostname, ',');
1521 if (comma != NULL) {
1522 if (comma == *hostname)
1523 goto out_bad_devname;
1524 *comma = '\0';
1525 }
1526
1527 colon++;
1528 len = strlen(colon);
1529 if (len > maxpathlen)
1530 goto out_path;
1531 *export_path = kstrndup(colon, len, GFP_KERNEL);
1532 if (!*export_path)
1533 goto out_nomem;
1534
1535 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1536 return 0;
1537
1538 out_bad_devname:
1539 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1540 return -EINVAL;
1541
1542 out_nomem:
1543 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1544 return -ENOMEM;
1545
1546 out_hostname:
1547 dfprintk(MOUNT, "NFS: server hostname too long\n");
1548 return -ENAMETOOLONG;
1549
1550 out_path:
1551 dfprintk(MOUNT, "NFS: export pathname too long\n");
1552 return -ENAMETOOLONG;
1553 }
1554
1555 /*
1556 * Hostname has square brackets around it because it contains one or
1557 * more colons. We look for the first closing square bracket, and a
1558 * colon must follow it.
1559 */
1560 static int nfs_parse_protected_hostname(const char *dev_name,
1561 char **hostname, size_t maxnamlen,
1562 char **export_path, size_t maxpathlen)
1563 {
1564 size_t len;
1565 char *start, *end;
1566
1567 start = (char *)(dev_name + 1);
1568
1569 end = strchr(start, ']');
1570 if (end == NULL)
1571 goto out_bad_devname;
1572 if (*(end + 1) != ':')
1573 goto out_bad_devname;
1574
1575 len = end - start;
1576 if (len > maxnamlen)
1577 goto out_hostname;
1578
1579 /* N.B. caller will free nfs_server.hostname in all cases */
1580 *hostname = kstrndup(start, len, GFP_KERNEL);
1581 if (*hostname == NULL)
1582 goto out_nomem;
1583
1584 end += 2;
1585 len = strlen(end);
1586 if (len > maxpathlen)
1587 goto out_path;
1588 *export_path = kstrndup(end, len, GFP_KERNEL);
1589 if (!*export_path)
1590 goto out_nomem;
1591
1592 return 0;
1593
1594 out_bad_devname:
1595 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1596 return -EINVAL;
1597
1598 out_nomem:
1599 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1600 return -ENOMEM;
1601
1602 out_hostname:
1603 dfprintk(MOUNT, "NFS: server hostname too long\n");
1604 return -ENAMETOOLONG;
1605
1606 out_path:
1607 dfprintk(MOUNT, "NFS: export pathname too long\n");
1608 return -ENAMETOOLONG;
1609 }
1610
1611 /*
1612 * Split "dev_name" into "hostname:export_path".
1613 *
1614 * The leftmost colon demarks the split between the server's hostname
1615 * and the export path. If the hostname starts with a left square
1616 * bracket, then it may contain colons.
1617 *
1618 * Note: caller frees hostname and export path, even on error.
1619 */
1620 static int nfs_parse_devname(const char *dev_name,
1621 char **hostname, size_t maxnamlen,
1622 char **export_path, size_t maxpathlen)
1623 {
1624 if (*dev_name == '[')
1625 return nfs_parse_protected_hostname(dev_name,
1626 hostname, maxnamlen,
1627 export_path, maxpathlen);
1628
1629 return nfs_parse_simple_hostname(dev_name,
1630 hostname, maxnamlen,
1631 export_path, maxpathlen);
1632 }
1633
1634 /*
1635 * Validate the NFS2/NFS3 mount data
1636 * - fills in the mount root filehandle
1637 *
1638 * For option strings, user space handles the following behaviors:
1639 *
1640 * + DNS: mapping server host name to IP address ("addr=" option)
1641 *
1642 * + failure mode: how to behave if a mount request can't be handled
1643 * immediately ("fg/bg" option)
1644 *
1645 * + retry: how often to retry a mount request ("retry=" option)
1646 *
1647 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1648 * mountproto=tcp after mountproto=udp, and so on
1649 */
1650 static int nfs_validate_mount_data(void *options,
1651 struct nfs_parsed_mount_data *args,
1652 struct nfs_fh *mntfh,
1653 const char *dev_name)
1654 {
1655 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1656 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1657
1658 if (data == NULL)
1659 goto out_no_data;
1660
1661 switch (data->version) {
1662 case 1:
1663 data->namlen = 0;
1664 case 2:
1665 data->bsize = 0;
1666 case 3:
1667 if (data->flags & NFS_MOUNT_VER3)
1668 goto out_no_v3;
1669 data->root.size = NFS2_FHSIZE;
1670 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1671 case 4:
1672 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1673 goto out_no_sec;
1674 case 5:
1675 memset(data->context, 0, sizeof(data->context));
1676 case 6:
1677 if (data->flags & NFS_MOUNT_VER3) {
1678 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1679 goto out_invalid_fh;
1680 mntfh->size = data->root.size;
1681 args->version = 3;
1682 } else {
1683 mntfh->size = NFS2_FHSIZE;
1684 args->version = 2;
1685 }
1686
1687
1688 memcpy(mntfh->data, data->root.data, mntfh->size);
1689 if (mntfh->size < sizeof(mntfh->data))
1690 memset(mntfh->data + mntfh->size, 0,
1691 sizeof(mntfh->data) - mntfh->size);
1692
1693 /*
1694 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1695 * can deal with.
1696 */
1697 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1698 args->rsize = data->rsize;
1699 args->wsize = data->wsize;
1700 args->timeo = data->timeo;
1701 args->retrans = data->retrans;
1702 args->acregmin = data->acregmin;
1703 args->acregmax = data->acregmax;
1704 args->acdirmin = data->acdirmin;
1705 args->acdirmax = data->acdirmax;
1706
1707 memcpy(sap, &data->addr, sizeof(data->addr));
1708 args->nfs_server.addrlen = sizeof(data->addr);
1709 if (!nfs_verify_server_address(sap))
1710 goto out_no_address;
1711
1712 if (!(data->flags & NFS_MOUNT_TCP))
1713 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1714 /* N.B. caller will free nfs_server.hostname in all cases */
1715 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1716 args->namlen = data->namlen;
1717 args->bsize = data->bsize;
1718
1719 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1720 args->auth_flavors[0] = data->pseudoflavor;
1721 if (!args->nfs_server.hostname)
1722 goto out_nomem;
1723
1724 /*
1725 * The legacy version 6 binary mount data from userspace has a
1726 * field used only to transport selinux information into the
1727 * the kernel. To continue to support that functionality we
1728 * have a touch of selinux knowledge here in the NFS code. The
1729 * userspace code converted context=blah to just blah so we are
1730 * converting back to the full string selinux understands.
1731 */
1732 if (data->context[0]){
1733 #ifdef CONFIG_SECURITY_SELINUX
1734 int rc;
1735 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1736 if (!opts_str)
1737 return -ENOMEM;
1738 strcpy(opts_str, "context=");
1739 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1740 strcat(opts_str, &data->context[0]);
1741 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1742 kfree(opts_str);
1743 if (rc)
1744 return rc;
1745 #else
1746 return -EINVAL;
1747 #endif
1748 }
1749
1750 break;
1751 default: {
1752 int status;
1753
1754 if (nfs_parse_mount_options((char *)options, args) == 0)
1755 return -EINVAL;
1756
1757 if (!nfs_verify_server_address(sap))
1758 goto out_no_address;
1759
1760 if (args->version == 4)
1761 #ifdef CONFIG_NFS_V4
1762 return nfs4_validate_text_mount_data(options,
1763 args, dev_name);
1764 #else
1765 goto out_v4_not_compiled;
1766 #endif
1767
1768 nfs_set_port(sap, &args->nfs_server.port, 0);
1769
1770 nfs_set_mount_transport_protocol(args);
1771
1772 status = nfs_parse_devname(dev_name,
1773 &args->nfs_server.hostname,
1774 PAGE_SIZE,
1775 &args->nfs_server.export_path,
1776 NFS_MAXPATHLEN);
1777 if (!status)
1778 status = nfs_try_mount(args, mntfh);
1779
1780 kfree(args->nfs_server.export_path);
1781 args->nfs_server.export_path = NULL;
1782
1783 if (status)
1784 return status;
1785
1786 break;
1787 }
1788 }
1789
1790 #ifndef CONFIG_NFS_V3
1791 if (args->version == 3)
1792 goto out_v3_not_compiled;
1793 #endif /* !CONFIG_NFS_V3 */
1794
1795 return 0;
1796
1797 out_no_data:
1798 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1799 return -EINVAL;
1800
1801 out_no_v3:
1802 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1803 data->version);
1804 return -EINVAL;
1805
1806 out_no_sec:
1807 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1808 return -EINVAL;
1809
1810 #ifndef CONFIG_NFS_V3
1811 out_v3_not_compiled:
1812 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1813 return -EPROTONOSUPPORT;
1814 #endif /* !CONFIG_NFS_V3 */
1815
1816 #ifndef CONFIG_NFS_V4
1817 out_v4_not_compiled:
1818 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1819 return -EPROTONOSUPPORT;
1820 #endif /* !CONFIG_NFS_V4 */
1821
1822 out_nomem:
1823 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1824 return -ENOMEM;
1825
1826 out_no_address:
1827 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1828 return -EINVAL;
1829
1830 out_invalid_fh:
1831 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1832 return -EINVAL;
1833 }
1834
1835 static int
1836 nfs_compare_remount_data(struct nfs_server *nfss,
1837 struct nfs_parsed_mount_data *data)
1838 {
1839 if (data->flags != nfss->flags ||
1840 data->rsize != nfss->rsize ||
1841 data->wsize != nfss->wsize ||
1842 data->retrans != nfss->client->cl_timeout->to_retries ||
1843 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1844 data->acregmin != nfss->acregmin / HZ ||
1845 data->acregmax != nfss->acregmax / HZ ||
1846 data->acdirmin != nfss->acdirmin / HZ ||
1847 data->acdirmax != nfss->acdirmax / HZ ||
1848 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1849 data->nfs_server.port != nfss->port ||
1850 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1851 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1852 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1853 return -EINVAL;
1854
1855 return 0;
1856 }
1857
1858 static int
1859 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1860 {
1861 int error;
1862 struct nfs_server *nfss = sb->s_fs_info;
1863 struct nfs_parsed_mount_data *data;
1864 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1865 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1866 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1867
1868 /*
1869 * Userspace mount programs that send binary options generally send
1870 * them populated with default values. We have no way to know which
1871 * ones were explicitly specified. Fall back to legacy behavior and
1872 * just return success.
1873 */
1874 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1875 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1876 options->version <= 6))))
1877 return 0;
1878
1879 data = kzalloc(sizeof(*data), GFP_KERNEL);
1880 if (data == NULL)
1881 return -ENOMEM;
1882
1883 lock_kernel();
1884 /* fill out struct with values from existing mount */
1885 data->flags = nfss->flags;
1886 data->rsize = nfss->rsize;
1887 data->wsize = nfss->wsize;
1888 data->retrans = nfss->client->cl_timeout->to_retries;
1889 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1890 data->acregmin = nfss->acregmin / HZ;
1891 data->acregmax = nfss->acregmax / HZ;
1892 data->acdirmin = nfss->acdirmin / HZ;
1893 data->acdirmax = nfss->acdirmax / HZ;
1894 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1895 data->nfs_server.port = nfss->port;
1896 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1897 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1898 data->nfs_server.addrlen);
1899
1900 /* overwrite those values with any that were specified */
1901 error = nfs_parse_mount_options((char *)options, data);
1902 if (error < 0)
1903 goto out;
1904
1905 /* compare new mount options with old ones */
1906 error = nfs_compare_remount_data(nfss, data);
1907 out:
1908 kfree(data);
1909 unlock_kernel();
1910 return error;
1911 }
1912
1913 /*
1914 * Initialise the common bits of the superblock
1915 */
1916 static inline void nfs_initialise_sb(struct super_block *sb)
1917 {
1918 struct nfs_server *server = NFS_SB(sb);
1919
1920 sb->s_magic = NFS_SUPER_MAGIC;
1921
1922 /* We probably want something more informative here */
1923 snprintf(sb->s_id, sizeof(sb->s_id),
1924 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1925
1926 if (sb->s_blocksize == 0)
1927 sb->s_blocksize = nfs_block_bits(server->wsize,
1928 &sb->s_blocksize_bits);
1929
1930 if (server->flags & NFS_MOUNT_NOAC)
1931 sb->s_flags |= MS_SYNCHRONOUS;
1932
1933 sb->s_bdi = &server->backing_dev_info;
1934
1935 nfs_super_set_maxbytes(sb, server->maxfilesize);
1936 }
1937
1938 /*
1939 * Finish setting up an NFS2/3 superblock
1940 */
1941 static void nfs_fill_super(struct super_block *sb,
1942 struct nfs_parsed_mount_data *data)
1943 {
1944 struct nfs_server *server = NFS_SB(sb);
1945
1946 sb->s_blocksize_bits = 0;
1947 sb->s_blocksize = 0;
1948 if (data->bsize)
1949 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1950
1951 if (server->nfs_client->rpc_ops->version == 3) {
1952 /* The VFS shouldn't apply the umask to mode bits. We will do
1953 * so ourselves when necessary.
1954 */
1955 sb->s_flags |= MS_POSIXACL;
1956 sb->s_time_gran = 1;
1957 }
1958
1959 sb->s_op = &nfs_sops;
1960 nfs_initialise_sb(sb);
1961 }
1962
1963 /*
1964 * Finish setting up a cloned NFS2/3 superblock
1965 */
1966 static void nfs_clone_super(struct super_block *sb,
1967 const struct super_block *old_sb)
1968 {
1969 struct nfs_server *server = NFS_SB(sb);
1970
1971 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1972 sb->s_blocksize = old_sb->s_blocksize;
1973 sb->s_maxbytes = old_sb->s_maxbytes;
1974
1975 if (server->nfs_client->rpc_ops->version == 3) {
1976 /* The VFS shouldn't apply the umask to mode bits. We will do
1977 * so ourselves when necessary.
1978 */
1979 sb->s_flags |= MS_POSIXACL;
1980 sb->s_time_gran = 1;
1981 }
1982
1983 sb->s_op = old_sb->s_op;
1984 nfs_initialise_sb(sb);
1985 }
1986
1987 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1988 {
1989 const struct nfs_server *a = s->s_fs_info;
1990 const struct rpc_clnt *clnt_a = a->client;
1991 const struct rpc_clnt *clnt_b = b->client;
1992
1993 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1994 goto Ebusy;
1995 if (a->nfs_client != b->nfs_client)
1996 goto Ebusy;
1997 if (a->flags != b->flags)
1998 goto Ebusy;
1999 if (a->wsize != b->wsize)
2000 goto Ebusy;
2001 if (a->rsize != b->rsize)
2002 goto Ebusy;
2003 if (a->acregmin != b->acregmin)
2004 goto Ebusy;
2005 if (a->acregmax != b->acregmax)
2006 goto Ebusy;
2007 if (a->acdirmin != b->acdirmin)
2008 goto Ebusy;
2009 if (a->acdirmax != b->acdirmax)
2010 goto Ebusy;
2011 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2012 goto Ebusy;
2013 return 1;
2014 Ebusy:
2015 return 0;
2016 }
2017
2018 struct nfs_sb_mountdata {
2019 struct nfs_server *server;
2020 int mntflags;
2021 };
2022
2023 static int nfs_set_super(struct super_block *s, void *data)
2024 {
2025 struct nfs_sb_mountdata *sb_mntdata = data;
2026 struct nfs_server *server = sb_mntdata->server;
2027 int ret;
2028
2029 s->s_flags = sb_mntdata->mntflags;
2030 s->s_fs_info = server;
2031 ret = set_anon_super(s, server);
2032 if (ret == 0)
2033 server->s_dev = s->s_dev;
2034 return ret;
2035 }
2036
2037 static int nfs_compare_super_address(struct nfs_server *server1,
2038 struct nfs_server *server2)
2039 {
2040 struct sockaddr *sap1, *sap2;
2041
2042 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2043 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2044
2045 if (sap1->sa_family != sap2->sa_family)
2046 return 0;
2047
2048 switch (sap1->sa_family) {
2049 case AF_INET: {
2050 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2051 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2052 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2053 return 0;
2054 if (sin1->sin_port != sin2->sin_port)
2055 return 0;
2056 break;
2057 }
2058 case AF_INET6: {
2059 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2060 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2061 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2062 return 0;
2063 if (sin1->sin6_port != sin2->sin6_port)
2064 return 0;
2065 break;
2066 }
2067 default:
2068 return 0;
2069 }
2070
2071 return 1;
2072 }
2073
2074 static int nfs_compare_super(struct super_block *sb, void *data)
2075 {
2076 struct nfs_sb_mountdata *sb_mntdata = data;
2077 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2078 int mntflags = sb_mntdata->mntflags;
2079
2080 if (!nfs_compare_super_address(old, server))
2081 return 0;
2082 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2083 if (old->flags & NFS_MOUNT_UNSHARED)
2084 return 0;
2085 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2086 return 0;
2087 return nfs_compare_mount_options(sb, server, mntflags);
2088 }
2089
2090 static int nfs_bdi_register(struct nfs_server *server)
2091 {
2092 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2093 }
2094
2095 static int nfs_get_sb(struct file_system_type *fs_type,
2096 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2097 {
2098 struct nfs_server *server = NULL;
2099 struct super_block *s;
2100 struct nfs_parsed_mount_data *data;
2101 struct nfs_fh *mntfh;
2102 struct dentry *mntroot;
2103 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2104 struct nfs_sb_mountdata sb_mntdata = {
2105 .mntflags = flags,
2106 };
2107 int error = -ENOMEM;
2108
2109 data = nfs_alloc_parsed_mount_data(3);
2110 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2111 if (data == NULL || mntfh == NULL)
2112 goto out_free_fh;
2113
2114 security_init_mnt_opts(&data->lsm_opts);
2115
2116 /* Validate the mount data */
2117 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2118 if (error < 0)
2119 goto out;
2120
2121 #ifdef CONFIG_NFS_V4
2122 if (data->version == 4) {
2123 error = nfs4_try_mount(flags, dev_name, data, mnt);
2124 kfree(data->client_address);
2125 goto out;
2126 }
2127 #endif /* CONFIG_NFS_V4 */
2128
2129 /* Get a volume representation */
2130 server = nfs_create_server(data, mntfh);
2131 if (IS_ERR(server)) {
2132 error = PTR_ERR(server);
2133 goto out;
2134 }
2135 sb_mntdata.server = server;
2136
2137 if (server->flags & NFS_MOUNT_UNSHARED)
2138 compare_super = NULL;
2139
2140 /* Get a superblock - note that we may end up sharing one that already exists */
2141 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2142 if (IS_ERR(s)) {
2143 error = PTR_ERR(s);
2144 goto out_err_nosb;
2145 }
2146
2147 if (s->s_fs_info != server) {
2148 nfs_free_server(server);
2149 server = NULL;
2150 } else {
2151 error = nfs_bdi_register(server);
2152 if (error)
2153 goto error_splat_super;
2154 }
2155
2156 if (!s->s_root) {
2157 /* initial superblock/root creation */
2158 nfs_fill_super(s, data);
2159 nfs_fscache_get_super_cookie(
2160 s, data ? data->fscache_uniq : NULL, NULL);
2161 }
2162
2163 mntroot = nfs_get_root(s, mntfh);
2164 if (IS_ERR(mntroot)) {
2165 error = PTR_ERR(mntroot);
2166 goto error_splat_super;
2167 }
2168
2169 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2170 if (error)
2171 goto error_splat_root;
2172
2173 s->s_flags |= MS_ACTIVE;
2174 mnt->mnt_sb = s;
2175 mnt->mnt_root = mntroot;
2176 error = 0;
2177
2178 out:
2179 kfree(data->nfs_server.hostname);
2180 kfree(data->mount_server.hostname);
2181 kfree(data->fscache_uniq);
2182 security_free_mnt_opts(&data->lsm_opts);
2183 out_free_fh:
2184 kfree(mntfh);
2185 kfree(data);
2186 return error;
2187
2188 out_err_nosb:
2189 nfs_free_server(server);
2190 goto out;
2191
2192 error_splat_root:
2193 dput(mntroot);
2194 error_splat_super:
2195 deactivate_locked_super(s);
2196 goto out;
2197 }
2198
2199 /*
2200 * Destroy an NFS2/3 superblock
2201 */
2202 static void nfs_kill_super(struct super_block *s)
2203 {
2204 struct nfs_server *server = NFS_SB(s);
2205
2206 kill_anon_super(s);
2207 bdi_unregister(&server->backing_dev_info);
2208 nfs_fscache_release_super_cookie(s);
2209 nfs_free_server(server);
2210 }
2211
2212 /*
2213 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2214 */
2215 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2216 const char *dev_name, void *raw_data,
2217 struct vfsmount *mnt)
2218 {
2219 struct nfs_clone_mount *data = raw_data;
2220 struct super_block *s;
2221 struct nfs_server *server;
2222 struct dentry *mntroot;
2223 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2224 struct nfs_sb_mountdata sb_mntdata = {
2225 .mntflags = flags,
2226 };
2227 int error;
2228
2229 dprintk("--> nfs_xdev_get_sb()\n");
2230
2231 /* create a new volume representation */
2232 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2233 if (IS_ERR(server)) {
2234 error = PTR_ERR(server);
2235 goto out_err_noserver;
2236 }
2237 sb_mntdata.server = server;
2238
2239 if (server->flags & NFS_MOUNT_UNSHARED)
2240 compare_super = NULL;
2241
2242 /* Get a superblock - note that we may end up sharing one that already exists */
2243 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2244 if (IS_ERR(s)) {
2245 error = PTR_ERR(s);
2246 goto out_err_nosb;
2247 }
2248
2249 if (s->s_fs_info != server) {
2250 nfs_free_server(server);
2251 server = NULL;
2252 } else {
2253 error = nfs_bdi_register(server);
2254 if (error)
2255 goto error_splat_super;
2256 }
2257
2258 if (!s->s_root) {
2259 /* initial superblock/root creation */
2260 nfs_clone_super(s, data->sb);
2261 nfs_fscache_get_super_cookie(s, NULL, data);
2262 }
2263
2264 mntroot = nfs_get_root(s, data->fh);
2265 if (IS_ERR(mntroot)) {
2266 error = PTR_ERR(mntroot);
2267 goto error_splat_super;
2268 }
2269 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2270 dput(mntroot);
2271 error = -ESTALE;
2272 goto error_splat_super;
2273 }
2274
2275 s->s_flags |= MS_ACTIVE;
2276 mnt->mnt_sb = s;
2277 mnt->mnt_root = mntroot;
2278
2279 /* clone any lsm security options from the parent to the new sb */
2280 security_sb_clone_mnt_opts(data->sb, s);
2281
2282 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2283 return 0;
2284
2285 out_err_nosb:
2286 nfs_free_server(server);
2287 out_err_noserver:
2288 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2289 return error;
2290
2291 error_splat_super:
2292 deactivate_locked_super(s);
2293 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2294 return error;
2295 }
2296
2297 #ifdef CONFIG_NFS_V4
2298
2299 /*
2300 * Finish setting up a cloned NFS4 superblock
2301 */
2302 static void nfs4_clone_super(struct super_block *sb,
2303 const struct super_block *old_sb)
2304 {
2305 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2306 sb->s_blocksize = old_sb->s_blocksize;
2307 sb->s_maxbytes = old_sb->s_maxbytes;
2308 sb->s_time_gran = 1;
2309 sb->s_op = old_sb->s_op;
2310 nfs_initialise_sb(sb);
2311 }
2312
2313 /*
2314 * Set up an NFS4 superblock
2315 */
2316 static void nfs4_fill_super(struct super_block *sb)
2317 {
2318 sb->s_time_gran = 1;
2319 sb->s_op = &nfs4_sops;
2320 nfs_initialise_sb(sb);
2321 }
2322
2323 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2324 {
2325 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2326 }
2327
2328 static int nfs4_validate_text_mount_data(void *options,
2329 struct nfs_parsed_mount_data *args,
2330 const char *dev_name)
2331 {
2332 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2333
2334 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2335
2336 nfs_validate_transport_protocol(args);
2337
2338 nfs4_validate_mount_flags(args);
2339
2340 if (args->version != 4) {
2341 dfprintk(MOUNT,
2342 "NFS4: Illegal mount version\n");
2343 return -EINVAL;
2344 }
2345
2346 if (args->auth_flavor_len > 1) {
2347 dfprintk(MOUNT,
2348 "NFS4: Too many RPC auth flavours specified\n");
2349 return -EINVAL;
2350 }
2351
2352 if (args->client_address == NULL) {
2353 dfprintk(MOUNT,
2354 "NFS4: mount program didn't pass callback address\n");
2355 return -EINVAL;
2356 }
2357
2358 return nfs_parse_devname(dev_name,
2359 &args->nfs_server.hostname,
2360 NFS4_MAXNAMLEN,
2361 &args->nfs_server.export_path,
2362 NFS4_MAXPATHLEN);
2363 }
2364
2365 /*
2366 * Validate NFSv4 mount options
2367 */
2368 static int nfs4_validate_mount_data(void *options,
2369 struct nfs_parsed_mount_data *args,
2370 const char *dev_name)
2371 {
2372 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2373 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2374 char *c;
2375
2376 if (data == NULL)
2377 goto out_no_data;
2378
2379 switch (data->version) {
2380 case 1:
2381 if (data->host_addrlen > sizeof(args->nfs_server.address))
2382 goto out_no_address;
2383 if (data->host_addrlen == 0)
2384 goto out_no_address;
2385 args->nfs_server.addrlen = data->host_addrlen;
2386 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2387 return -EFAULT;
2388 if (!nfs_verify_server_address(sap))
2389 goto out_no_address;
2390
2391 if (data->auth_flavourlen) {
2392 if (data->auth_flavourlen > 1)
2393 goto out_inval_auth;
2394 if (copy_from_user(&args->auth_flavors[0],
2395 data->auth_flavours,
2396 sizeof(args->auth_flavors[0])))
2397 return -EFAULT;
2398 }
2399
2400 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2401 if (IS_ERR(c))
2402 return PTR_ERR(c);
2403 args->nfs_server.hostname = c;
2404
2405 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2406 if (IS_ERR(c))
2407 return PTR_ERR(c);
2408 args->nfs_server.export_path = c;
2409 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2410
2411 c = strndup_user(data->client_addr.data, 16);
2412 if (IS_ERR(c))
2413 return PTR_ERR(c);
2414 args->client_address = c;
2415
2416 /*
2417 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2418 * can deal with.
2419 */
2420
2421 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2422 args->rsize = data->rsize;
2423 args->wsize = data->wsize;
2424 args->timeo = data->timeo;
2425 args->retrans = data->retrans;
2426 args->acregmin = data->acregmin;
2427 args->acregmax = data->acregmax;
2428 args->acdirmin = data->acdirmin;
2429 args->acdirmax = data->acdirmax;
2430 args->nfs_server.protocol = data->proto;
2431 nfs_validate_transport_protocol(args);
2432
2433 break;
2434 default:
2435 if (nfs_parse_mount_options((char *)options, args) == 0)
2436 return -EINVAL;
2437
2438 if (!nfs_verify_server_address(sap))
2439 return -EINVAL;
2440
2441 return nfs4_validate_text_mount_data(options, args, dev_name);
2442 }
2443
2444 return 0;
2445
2446 out_no_data:
2447 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2448 return -EINVAL;
2449
2450 out_inval_auth:
2451 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2452 data->auth_flavourlen);
2453 return -EINVAL;
2454
2455 out_no_address:
2456 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2457 return -EINVAL;
2458 }
2459
2460 /*
2461 * Get the superblock for the NFS4 root partition
2462 */
2463 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2464 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2465 {
2466 struct nfs_parsed_mount_data *data = raw_data;
2467 struct super_block *s;
2468 struct nfs_server *server;
2469 struct nfs_fh *mntfh;
2470 struct dentry *mntroot;
2471 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2472 struct nfs_sb_mountdata sb_mntdata = {
2473 .mntflags = flags,
2474 };
2475 int error = -ENOMEM;
2476
2477 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2478 if (data == NULL || mntfh == NULL)
2479 goto out_free_fh;
2480
2481 security_init_mnt_opts(&data->lsm_opts);
2482
2483 /* Get a volume representation */
2484 server = nfs4_create_server(data, mntfh);
2485 if (IS_ERR(server)) {
2486 error = PTR_ERR(server);
2487 goto out;
2488 }
2489 sb_mntdata.server = server;
2490
2491 if (server->flags & NFS4_MOUNT_UNSHARED)
2492 compare_super = NULL;
2493
2494 /* Get a superblock - note that we may end up sharing one that already exists */
2495 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2496 if (IS_ERR(s)) {
2497 error = PTR_ERR(s);
2498 goto out_free;
2499 }
2500
2501 if (s->s_fs_info != server) {
2502 nfs_free_server(server);
2503 server = NULL;
2504 } else {
2505 error = nfs_bdi_register(server);
2506 if (error)
2507 goto error_splat_super;
2508 }
2509
2510 if (!s->s_root) {
2511 /* initial superblock/root creation */
2512 nfs4_fill_super(s);
2513 nfs_fscache_get_super_cookie(
2514 s, data ? data->fscache_uniq : NULL, NULL);
2515 }
2516
2517 mntroot = nfs4_get_root(s, mntfh);
2518 if (IS_ERR(mntroot)) {
2519 error = PTR_ERR(mntroot);
2520 goto error_splat_super;
2521 }
2522
2523 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2524 if (error)
2525 goto error_splat_root;
2526
2527 s->s_flags |= MS_ACTIVE;
2528 mnt->mnt_sb = s;
2529 mnt->mnt_root = mntroot;
2530 error = 0;
2531
2532 out:
2533 security_free_mnt_opts(&data->lsm_opts);
2534 out_free_fh:
2535 kfree(mntfh);
2536 return error;
2537
2538 out_free:
2539 nfs_free_server(server);
2540 goto out;
2541
2542 error_splat_root:
2543 dput(mntroot);
2544 error_splat_super:
2545 deactivate_locked_super(s);
2546 goto out;
2547 }
2548
2549 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2550 int flags, void *data, const char *hostname)
2551 {
2552 struct vfsmount *root_mnt;
2553 char *root_devname;
2554 size_t len;
2555
2556 len = strlen(hostname) + 3;
2557 root_devname = kmalloc(len, GFP_KERNEL);
2558 if (root_devname == NULL)
2559 return ERR_PTR(-ENOMEM);
2560 snprintf(root_devname, len, "%s:/", hostname);
2561 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2562 kfree(root_devname);
2563 return root_mnt;
2564 }
2565
2566 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2567 {
2568 char *page = (char *) __get_free_page(GFP_KERNEL);
2569 char *devname, *tmp;
2570
2571 if (page == NULL)
2572 return;
2573 devname = nfs_path(path->mnt->mnt_devname,
2574 path->mnt->mnt_root, path->dentry,
2575 page, PAGE_SIZE);
2576 if (devname == NULL)
2577 goto out_freepage;
2578 tmp = kstrdup(devname, GFP_KERNEL);
2579 if (tmp == NULL)
2580 goto out_freepage;
2581 kfree(mnt->mnt_devname);
2582 mnt->mnt_devname = tmp;
2583 out_freepage:
2584 free_page((unsigned long)page);
2585 }
2586
2587 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2588 const char *export_path, struct vfsmount *mnt_target)
2589 {
2590 struct mnt_namespace *ns_private;
2591 struct nameidata nd;
2592 struct super_block *s;
2593 int ret;
2594
2595 ns_private = create_mnt_ns(root_mnt);
2596 ret = PTR_ERR(ns_private);
2597 if (IS_ERR(ns_private))
2598 goto out_mntput;
2599
2600 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2601 export_path, LOOKUP_FOLLOW, &nd);
2602
2603 put_mnt_ns(ns_private);
2604
2605 if (ret != 0)
2606 goto out_err;
2607
2608 s = nd.path.mnt->mnt_sb;
2609 atomic_inc(&s->s_active);
2610 mnt_target->mnt_sb = s;
2611 mnt_target->mnt_root = dget(nd.path.dentry);
2612
2613 /* Correct the device pathname */
2614 nfs_fix_devname(&nd.path, mnt_target);
2615
2616 path_put(&nd.path);
2617 down_write(&s->s_umount);
2618 return 0;
2619 out_mntput:
2620 mntput(root_mnt);
2621 out_err:
2622 return ret;
2623 }
2624
2625 static int nfs4_try_mount(int flags, const char *dev_name,
2626 struct nfs_parsed_mount_data *data,
2627 struct vfsmount *mnt)
2628 {
2629 char *export_path;
2630 struct vfsmount *root_mnt;
2631 int error;
2632
2633 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2634
2635 export_path = data->nfs_server.export_path;
2636 data->nfs_server.export_path = "/";
2637 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2638 data->nfs_server.hostname);
2639 data->nfs_server.export_path = export_path;
2640
2641 error = PTR_ERR(root_mnt);
2642 if (IS_ERR(root_mnt))
2643 goto out;
2644
2645 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2646
2647 out:
2648 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2649 error != 0 ? " [error]" : "");
2650 return error;
2651 }
2652
2653 /*
2654 * Get the superblock for an NFS4 mountpoint
2655 */
2656 static int nfs4_get_sb(struct file_system_type *fs_type,
2657 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2658 {
2659 struct nfs_parsed_mount_data *data;
2660 int error = -ENOMEM;
2661
2662 data = nfs_alloc_parsed_mount_data(4);
2663 if (data == NULL)
2664 goto out_free_data;
2665
2666 /* Validate the mount data */
2667 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2668 if (error < 0)
2669 goto out;
2670
2671 error = nfs4_try_mount(flags, dev_name, data, mnt);
2672
2673 out:
2674 kfree(data->client_address);
2675 kfree(data->nfs_server.export_path);
2676 kfree(data->nfs_server.hostname);
2677 kfree(data->fscache_uniq);
2678 out_free_data:
2679 kfree(data);
2680 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2681 error != 0 ? " [error]" : "");
2682 return error;
2683 }
2684
2685 static void nfs4_kill_super(struct super_block *sb)
2686 {
2687 struct nfs_server *server = NFS_SB(sb);
2688
2689 dprintk("--> %s\n", __func__);
2690 nfs_super_return_all_delegations(sb);
2691 kill_anon_super(sb);
2692 nfs_fscache_release_super_cookie(sb);
2693 nfs_free_server(server);
2694 dprintk("<-- %s\n", __func__);
2695 }
2696
2697 /*
2698 * Clone an NFS4 server record on xdev traversal (FSID-change)
2699 */
2700 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2701 const char *dev_name, void *raw_data,
2702 struct vfsmount *mnt)
2703 {
2704 struct nfs_clone_mount *data = raw_data;
2705 struct super_block *s;
2706 struct nfs_server *server;
2707 struct dentry *mntroot;
2708 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2709 struct nfs_sb_mountdata sb_mntdata = {
2710 .mntflags = flags,
2711 };
2712 int error;
2713
2714 dprintk("--> nfs4_xdev_get_sb()\n");
2715
2716 /* create a new volume representation */
2717 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2718 if (IS_ERR(server)) {
2719 error = PTR_ERR(server);
2720 goto out_err_noserver;
2721 }
2722 sb_mntdata.server = server;
2723
2724 if (server->flags & NFS4_MOUNT_UNSHARED)
2725 compare_super = NULL;
2726
2727 /* Get a superblock - note that we may end up sharing one that already exists */
2728 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2729 if (IS_ERR(s)) {
2730 error = PTR_ERR(s);
2731 goto out_err_nosb;
2732 }
2733
2734 if (s->s_fs_info != server) {
2735 nfs_free_server(server);
2736 server = NULL;
2737 } else {
2738 error = nfs_bdi_register(server);
2739 if (error)
2740 goto error_splat_super;
2741 }
2742
2743 if (!s->s_root) {
2744 /* initial superblock/root creation */
2745 nfs4_clone_super(s, data->sb);
2746 nfs_fscache_get_super_cookie(s, NULL, data);
2747 }
2748
2749 mntroot = nfs4_get_root(s, data->fh);
2750 if (IS_ERR(mntroot)) {
2751 error = PTR_ERR(mntroot);
2752 goto error_splat_super;
2753 }
2754 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2755 dput(mntroot);
2756 error = -ESTALE;
2757 goto error_splat_super;
2758 }
2759
2760 s->s_flags |= MS_ACTIVE;
2761 mnt->mnt_sb = s;
2762 mnt->mnt_root = mntroot;
2763
2764 security_sb_clone_mnt_opts(data->sb, s);
2765
2766 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2767 return 0;
2768
2769 out_err_nosb:
2770 nfs_free_server(server);
2771 out_err_noserver:
2772 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2773 return error;
2774
2775 error_splat_super:
2776 deactivate_locked_super(s);
2777 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2778 return error;
2779 }
2780
2781 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2782 int flags, const char *dev_name, void *raw_data,
2783 struct vfsmount *mnt)
2784 {
2785 struct nfs_clone_mount *data = raw_data;
2786 struct super_block *s;
2787 struct nfs_server *server;
2788 struct dentry *mntroot;
2789 struct nfs_fh mntfh;
2790 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2791 struct nfs_sb_mountdata sb_mntdata = {
2792 .mntflags = flags,
2793 };
2794 int error;
2795
2796 dprintk("--> nfs4_referral_get_sb()\n");
2797
2798 /* create a new volume representation */
2799 server = nfs4_create_referral_server(data, &mntfh);
2800 if (IS_ERR(server)) {
2801 error = PTR_ERR(server);
2802 goto out_err_noserver;
2803 }
2804 sb_mntdata.server = server;
2805
2806 if (server->flags & NFS4_MOUNT_UNSHARED)
2807 compare_super = NULL;
2808
2809 /* Get a superblock - note that we may end up sharing one that already exists */
2810 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2811 if (IS_ERR(s)) {
2812 error = PTR_ERR(s);
2813 goto out_err_nosb;
2814 }
2815
2816 if (s->s_fs_info != server) {
2817 nfs_free_server(server);
2818 server = NULL;
2819 } else {
2820 error = nfs_bdi_register(server);
2821 if (error)
2822 goto error_splat_super;
2823 }
2824
2825 if (!s->s_root) {
2826 /* initial superblock/root creation */
2827 nfs4_fill_super(s);
2828 nfs_fscache_get_super_cookie(s, NULL, data);
2829 }
2830
2831 mntroot = nfs4_get_root(s, &mntfh);
2832 if (IS_ERR(mntroot)) {
2833 error = PTR_ERR(mntroot);
2834 goto error_splat_super;
2835 }
2836 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2837 dput(mntroot);
2838 error = -ESTALE;
2839 goto error_splat_super;
2840 }
2841
2842 s->s_flags |= MS_ACTIVE;
2843 mnt->mnt_sb = s;
2844 mnt->mnt_root = mntroot;
2845
2846 security_sb_clone_mnt_opts(data->sb, s);
2847
2848 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2849 return 0;
2850
2851 out_err_nosb:
2852 nfs_free_server(server);
2853 out_err_noserver:
2854 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2855 return error;
2856
2857 error_splat_super:
2858 deactivate_locked_super(s);
2859 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2860 return error;
2861 }
2862
2863 /*
2864 * Create an NFS4 server record on referral traversal
2865 */
2866 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2867 int flags, const char *dev_name, void *raw_data,
2868 struct vfsmount *mnt)
2869 {
2870 struct nfs_clone_mount *data = raw_data;
2871 char *export_path;
2872 struct vfsmount *root_mnt;
2873 int error;
2874
2875 dprintk("--> nfs4_referral_get_sb()\n");
2876
2877 export_path = data->mnt_path;
2878 data->mnt_path = "/";
2879
2880 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2881 flags, data, data->hostname);
2882 data->mnt_path = export_path;
2883
2884 error = PTR_ERR(root_mnt);
2885 if (IS_ERR(root_mnt))
2886 goto out;
2887
2888 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2889 out:
2890 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2891 error != 0 ? " [error]" : "");
2892 return error;
2893 }
2894
2895 #endif /* CONFIG_NFS_V4 */
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