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powerpc: define a compat_sys_recv cond_syscall
[linux-2.6/kvm.git] / fs / nfs / super.c
blobec3966e4706b2f70d8709199f86456392a6e6584
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 <linux/slab.h>
52 #include <net/ipv6.h>
53 #include <linux/netdevice.h>
54 #include <linux/nfs_xdr.h>
55 #include <linux/magic.h>
56 #include <linux/parser.h>
57
58 #include <asm/system.h>
59 #include <asm/uaccess.h>
60
61 #include "nfs4_fs.h"
62 #include "callback.h"
63 #include "delegation.h"
64 #include "iostat.h"
65 #include "internal.h"
66 #include "fscache.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69
70 enum {
71 /* Mount options that take no arguments */
72 Opt_soft, Opt_hard,
73 Opt_posix, Opt_noposix,
74 Opt_cto, Opt_nocto,
75 Opt_ac, Opt_noac,
76 Opt_lock, Opt_nolock,
77 Opt_v2, Opt_v3, Opt_v4,
78 Opt_udp, Opt_tcp, Opt_rdma,
79 Opt_acl, Opt_noacl,
80 Opt_rdirplus, Opt_nordirplus,
81 Opt_sharecache, Opt_nosharecache,
82 Opt_resvport, Opt_noresvport,
83 Opt_fscache, Opt_nofscache,
84
85 /* Mount options that take integer arguments */
86 Opt_port,
87 Opt_rsize, Opt_wsize, Opt_bsize,
88 Opt_timeo, Opt_retrans,
89 Opt_acregmin, Opt_acregmax,
90 Opt_acdirmin, Opt_acdirmax,
91 Opt_actimeo,
92 Opt_namelen,
93 Opt_mountport,
94 Opt_mountvers,
95 Opt_nfsvers,
96 Opt_minorversion,
97
98 /* Mount options that take string arguments */
99 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
100 Opt_addr, Opt_mountaddr, Opt_clientaddr,
101 Opt_lookupcache,
102 Opt_fscache_uniq,
103
104 /* Special mount options */
105 Opt_userspace, Opt_deprecated, Opt_sloppy,
106
107 Opt_err
108 };
109
110 static const match_table_t nfs_mount_option_tokens = {
111 { Opt_userspace, "bg" },
112 { Opt_userspace, "fg" },
113 { Opt_userspace, "retry=%s" },
114
115 { Opt_sloppy, "sloppy" },
116
117 { Opt_soft, "soft" },
118 { Opt_hard, "hard" },
119 { Opt_deprecated, "intr" },
120 { Opt_deprecated, "nointr" },
121 { Opt_posix, "posix" },
122 { Opt_noposix, "noposix" },
123 { Opt_cto, "cto" },
124 { Opt_nocto, "nocto" },
125 { Opt_ac, "ac" },
126 { Opt_noac, "noac" },
127 { Opt_lock, "lock" },
128 { Opt_nolock, "nolock" },
129 { Opt_v2, "v2" },
130 { Opt_v3, "v3" },
131 { Opt_v4, "v4" },
132 { Opt_udp, "udp" },
133 { Opt_tcp, "tcp" },
134 { Opt_rdma, "rdma" },
135 { Opt_acl, "acl" },
136 { Opt_noacl, "noacl" },
137 { Opt_rdirplus, "rdirplus" },
138 { Opt_nordirplus, "nordirplus" },
139 { Opt_sharecache, "sharecache" },
140 { Opt_nosharecache, "nosharecache" },
141 { Opt_resvport, "resvport" },
142 { Opt_noresvport, "noresvport" },
143 { Opt_fscache, "fsc" },
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 { Opt_fscache_uniq, "fsc=%s" },
174
175 { Opt_err, NULL }
176 };
177
178 enum {
179 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
180
181 Opt_xprt_err
182 };
183
184 static const match_table_t nfs_xprt_protocol_tokens = {
185 { Opt_xprt_udp, "udp" },
186 { Opt_xprt_udp6, "udp6" },
187 { Opt_xprt_tcp, "tcp" },
188 { Opt_xprt_tcp6, "tcp6" },
189 { Opt_xprt_rdma, "rdma" },
190
191 { Opt_xprt_err, NULL }
192 };
193
194 enum {
195 Opt_sec_none, Opt_sec_sys,
196 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
197 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
198 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
199
200 Opt_sec_err
201 };
202
203 static const match_table_t nfs_secflavor_tokens = {
204 { Opt_sec_none, "none" },
205 { Opt_sec_none, "null" },
206 { Opt_sec_sys, "sys" },
207
208 { Opt_sec_krb5, "krb5" },
209 { Opt_sec_krb5i, "krb5i" },
210 { Opt_sec_krb5p, "krb5p" },
211
212 { Opt_sec_lkey, "lkey" },
213 { Opt_sec_lkeyi, "lkeyi" },
214 { Opt_sec_lkeyp, "lkeyp" },
215
216 { Opt_sec_spkm, "spkm3" },
217 { Opt_sec_spkmi, "spkm3i" },
218 { Opt_sec_spkmp, "spkm3p" },
219
220 { Opt_sec_err, NULL }
221 };
222
223 enum {
224 Opt_lookupcache_all, Opt_lookupcache_positive,
225 Opt_lookupcache_none,
226
227 Opt_lookupcache_err
228 };
229
230 static match_table_t nfs_lookupcache_tokens = {
231 { Opt_lookupcache_all, "all" },
232 { Opt_lookupcache_positive, "pos" },
233 { Opt_lookupcache_positive, "positive" },
234 { Opt_lookupcache_none, "none" },
235
236 { Opt_lookupcache_err, NULL }
237 };
238
239
240 static void nfs_umount_begin(struct super_block *);
241 static int nfs_statfs(struct dentry *, struct kstatfs *);
242 static int nfs_show_options(struct seq_file *, struct vfsmount *);
243 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
244 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
245 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
247 static void nfs_put_super(struct super_block *);
248 static void nfs_kill_super(struct super_block *);
249 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
250
251 static struct file_system_type nfs_fs_type = {
252 .owner = THIS_MODULE,
253 .name = "nfs",
254 .get_sb = nfs_get_sb,
255 .kill_sb = nfs_kill_super,
256 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
257 };
258
259 struct file_system_type nfs_xdev_fs_type = {
260 .owner = THIS_MODULE,
261 .name = "nfs",
262 .get_sb = nfs_xdev_get_sb,
263 .kill_sb = nfs_kill_super,
264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
265 };
266
267 static const struct super_operations nfs_sops = {
268 .alloc_inode = nfs_alloc_inode,
269 .destroy_inode = nfs_destroy_inode,
270 .write_inode = nfs_write_inode,
271 .put_super = nfs_put_super,
272 .statfs = nfs_statfs,
273 .evict_inode = nfs_evict_inode,
274 .umount_begin = nfs_umount_begin,
275 .show_options = nfs_show_options,
276 .show_stats = nfs_show_stats,
277 .remount_fs = nfs_remount,
278 };
279
280 #ifdef CONFIG_NFS_V4
281 static int nfs4_validate_text_mount_data(void *options,
282 struct nfs_parsed_mount_data *args, const char *dev_name);
283 static int nfs4_try_mount(int flags, const char *dev_name,
284 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
285 static int nfs4_get_sb(struct file_system_type *fs_type,
286 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
287 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
289 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
290 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
291 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
292 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
293 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
294 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
295 static void nfs4_kill_super(struct super_block *sb);
296
297 static struct file_system_type nfs4_fs_type = {
298 .owner = THIS_MODULE,
299 .name = "nfs4",
300 .get_sb = nfs4_get_sb,
301 .kill_sb = nfs4_kill_super,
302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
303 };
304
305 static struct file_system_type nfs4_remote_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs4",
308 .get_sb = nfs4_remote_get_sb,
309 .kill_sb = nfs4_kill_super,
310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
311 };
312
313 struct file_system_type nfs4_xdev_fs_type = {
314 .owner = THIS_MODULE,
315 .name = "nfs4",
316 .get_sb = nfs4_xdev_get_sb,
317 .kill_sb = nfs4_kill_super,
318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
319 };
320
321 static struct file_system_type nfs4_remote_referral_fs_type = {
322 .owner = THIS_MODULE,
323 .name = "nfs4",
324 .get_sb = nfs4_remote_referral_get_sb,
325 .kill_sb = nfs4_kill_super,
326 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
327 };
328
329 struct file_system_type nfs4_referral_fs_type = {
330 .owner = THIS_MODULE,
331 .name = "nfs4",
332 .get_sb = nfs4_referral_get_sb,
333 .kill_sb = nfs4_kill_super,
334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
335 };
336
337 static const struct super_operations nfs4_sops = {
338 .alloc_inode = nfs_alloc_inode,
339 .destroy_inode = nfs_destroy_inode,
340 .write_inode = nfs_write_inode,
341 .put_super = nfs_put_super,
342 .statfs = nfs_statfs,
343 .evict_inode = nfs4_evict_inode,
344 .umount_begin = nfs_umount_begin,
345 .show_options = nfs_show_options,
346 .show_stats = nfs_show_stats,
347 .remount_fs = nfs_remount,
348 };
349 #endif
350
351 static struct shrinker acl_shrinker = {
352 .shrink = nfs_access_cache_shrinker,
353 .seeks = DEFAULT_SEEKS,
354 };
355
356 /*
357 * Register the NFS filesystems
358 */
359 int __init register_nfs_fs(void)
360 {
361 int ret;
362
363 ret = register_filesystem(&nfs_fs_type);
364 if (ret < 0)
365 goto error_0;
366
367 ret = nfs_register_sysctl();
368 if (ret < 0)
369 goto error_1;
370 #ifdef CONFIG_NFS_V4
371 ret = register_filesystem(&nfs4_fs_type);
372 if (ret < 0)
373 goto error_2;
374 #endif
375 register_shrinker(&acl_shrinker);
376 return 0;
377
378 #ifdef CONFIG_NFS_V4
379 error_2:
380 nfs_unregister_sysctl();
381 #endif
382 error_1:
383 unregister_filesystem(&nfs_fs_type);
384 error_0:
385 return ret;
386 }
387
388 /*
389 * Unregister the NFS filesystems
390 */
391 void __exit unregister_nfs_fs(void)
392 {
393 unregister_shrinker(&acl_shrinker);
394 #ifdef CONFIG_NFS_V4
395 unregister_filesystem(&nfs4_fs_type);
396 #endif
397 nfs_unregister_sysctl();
398 unregister_filesystem(&nfs_fs_type);
399 }
400
401 void nfs_sb_active(struct super_block *sb)
402 {
403 struct nfs_server *server = NFS_SB(sb);
404
405 if (atomic_inc_return(&server->active) == 1)
406 atomic_inc(&sb->s_active);
407 }
408
409 void nfs_sb_deactive(struct super_block *sb)
410 {
411 struct nfs_server *server = NFS_SB(sb);
412
413 if (atomic_dec_and_test(&server->active))
414 deactivate_super(sb);
415 }
416
417 /*
418 * Deliver file system statistics to userspace
419 */
420 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
421 {
422 struct nfs_server *server = NFS_SB(dentry->d_sb);
423 unsigned char blockbits;
424 unsigned long blockres;
425 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
426 struct nfs_fsstat res;
427 int error = -ENOMEM;
428
429 res.fattr = nfs_alloc_fattr();
430 if (res.fattr == NULL)
431 goto out_err;
432
433 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
434
435 nfs_free_fattr(res.fattr);
436 if (error < 0)
437 goto out_err;
438
439 buf->f_type = NFS_SUPER_MAGIC;
440
441 /*
442 * Current versions of glibc do not correctly handle the
443 * case where f_frsize != f_bsize. Eventually we want to
444 * report the value of wtmult in this field.
445 */
446 buf->f_frsize = dentry->d_sb->s_blocksize;
447
448 /*
449 * On most *nix systems, f_blocks, f_bfree, and f_bavail
450 * are reported in units of f_frsize. Linux hasn't had
451 * an f_frsize field in its statfs struct until recently,
452 * thus historically Linux's sys_statfs reports these
453 * fields in units of f_bsize.
454 */
455 buf->f_bsize = dentry->d_sb->s_blocksize;
456 blockbits = dentry->d_sb->s_blocksize_bits;
457 blockres = (1 << blockbits) - 1;
458 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
459 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
460 buf->f_bavail = (res.abytes + blockres) >> blockbits;
461
462 buf->f_files = res.tfiles;
463 buf->f_ffree = res.afiles;
464
465 buf->f_namelen = server->namelen;
466
467 return 0;
468
469 out_err:
470 dprintk("%s: statfs error = %d\n", __func__, -error);
471 return error;
472 }
473
474 /*
475 * Map the security flavour number to a name
476 */
477 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
478 {
479 static const struct {
480 rpc_authflavor_t flavour;
481 const char *str;
482 } sec_flavours[] = {
483 { RPC_AUTH_NULL, "null" },
484 { RPC_AUTH_UNIX, "sys" },
485 { RPC_AUTH_GSS_KRB5, "krb5" },
486 { RPC_AUTH_GSS_KRB5I, "krb5i" },
487 { RPC_AUTH_GSS_KRB5P, "krb5p" },
488 { RPC_AUTH_GSS_LKEY, "lkey" },
489 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
490 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
491 { RPC_AUTH_GSS_SPKM, "spkm" },
492 { RPC_AUTH_GSS_SPKMI, "spkmi" },
493 { RPC_AUTH_GSS_SPKMP, "spkmp" },
494 { UINT_MAX, "unknown" }
495 };
496 int i;
497
498 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
499 if (sec_flavours[i].flavour == flavour)
500 break;
501 }
502 return sec_flavours[i].str;
503 }
504
505 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
506 int showdefaults)
507 {
508 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
509
510 seq_printf(m, ",mountproto=");
511 switch (sap->sa_family) {
512 case AF_INET:
513 switch (nfss->mountd_protocol) {
514 case IPPROTO_UDP:
515 seq_printf(m, RPCBIND_NETID_UDP);
516 break;
517 case IPPROTO_TCP:
518 seq_printf(m, RPCBIND_NETID_TCP);
519 break;
520 default:
521 if (showdefaults)
522 seq_printf(m, "auto");
523 }
524 break;
525 case AF_INET6:
526 switch (nfss->mountd_protocol) {
527 case IPPROTO_UDP:
528 seq_printf(m, RPCBIND_NETID_UDP6);
529 break;
530 case IPPROTO_TCP:
531 seq_printf(m, RPCBIND_NETID_TCP6);
532 break;
533 default:
534 if (showdefaults)
535 seq_printf(m, "auto");
536 }
537 break;
538 default:
539 if (showdefaults)
540 seq_printf(m, "auto");
541 }
542 }
543
544 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546 {
547 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
548
549 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
550 return;
551
552 switch (sap->sa_family) {
553 case AF_INET: {
554 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
555 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
556 break;
557 }
558 case AF_INET6: {
559 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
560 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
561 break;
562 }
563 default:
564 if (showdefaults)
565 seq_printf(m, ",mountaddr=unspecified");
566 }
567
568 if (nfss->mountd_version || showdefaults)
569 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
570 if (nfss->mountd_port || showdefaults)
571 seq_printf(m, ",mountport=%u", nfss->mountd_port);
572
573 nfs_show_mountd_netid(m, nfss, showdefaults);
574 }
575
576 #ifdef CONFIG_NFS_V4
577 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
578 int showdefaults)
579 {
580 struct nfs_client *clp = nfss->nfs_client;
581
582 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
583 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
584 }
585 #else
586 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
587 int showdefaults)
588 {
589 }
590 #endif
591
592 /*
593 * Describe the mount options in force on this server representation
594 */
595 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
596 int showdefaults)
597 {
598 static const struct proc_nfs_info {
599 int flag;
600 const char *str;
601 const char *nostr;
602 } nfs_info[] = {
603 { NFS_MOUNT_SOFT, ",soft", ",hard" },
604 { NFS_MOUNT_POSIX, ",posix", "" },
605 { NFS_MOUNT_NOCTO, ",nocto", "" },
606 { NFS_MOUNT_NOAC, ",noac", "" },
607 { NFS_MOUNT_NONLM, ",nolock", "" },
608 { NFS_MOUNT_NOACL, ",noacl", "" },
609 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
610 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
611 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
612 { 0, NULL, NULL }
613 };
614 const struct proc_nfs_info *nfs_infop;
615 struct nfs_client *clp = nfss->nfs_client;
616 u32 version = clp->rpc_ops->version;
617
618 seq_printf(m, ",vers=%u", version);
619 seq_printf(m, ",rsize=%u", nfss->rsize);
620 seq_printf(m, ",wsize=%u", nfss->wsize);
621 if (nfss->bsize != 0)
622 seq_printf(m, ",bsize=%u", nfss->bsize);
623 seq_printf(m, ",namlen=%u", nfss->namelen);
624 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
625 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
626 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
627 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
628 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
629 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
630 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
631 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
632 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
633 if (nfss->flags & nfs_infop->flag)
634 seq_puts(m, nfs_infop->str);
635 else
636 seq_puts(m, nfs_infop->nostr);
637 }
638 seq_printf(m, ",proto=%s",
639 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
640 if (version == 4) {
641 if (nfss->port != NFS_PORT)
642 seq_printf(m, ",port=%u", nfss->port);
643 } else
644 if (nfss->port)
645 seq_printf(m, ",port=%u", nfss->port);
646
647 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
648 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
649 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
650
651 if (version != 4)
652 nfs_show_mountd_options(m, nfss, showdefaults);
653 else
654 nfs_show_nfsv4_options(m, nfss, showdefaults);
655
656 if (nfss->options & NFS_OPTION_FSCACHE)
657 seq_printf(m, ",fsc");
658
659 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
660 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
661 seq_printf(m, ",lookupcache=none");
662 else
663 seq_printf(m, ",lookupcache=pos");
664 }
665 }
666
667 /*
668 * Describe the mount options on this VFS mountpoint
669 */
670 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
671 {
672 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
673
674 nfs_show_mount_options(m, nfss, 0);
675
676 seq_printf(m, ",addr=%s",
677 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
678 RPC_DISPLAY_ADDR));
679
680 return 0;
681 }
682
683 /*
684 * Present statistical information for this VFS mountpoint
685 */
686 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
687 {
688 int i, cpu;
689 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
690 struct rpc_auth *auth = nfss->client->cl_auth;
691 struct nfs_iostats totals = { };
692
693 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
694
695 /*
696 * Display all mount option settings
697 */
698 seq_printf(m, "\n\topts:\t");
699 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
700 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
701 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
702 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
703 nfs_show_mount_options(m, nfss, 1);
704
705 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
706
707 seq_printf(m, "\n\tcaps:\t");
708 seq_printf(m, "caps=0x%x", nfss->caps);
709 seq_printf(m, ",wtmult=%u", nfss->wtmult);
710 seq_printf(m, ",dtsize=%u", nfss->dtsize);
711 seq_printf(m, ",bsize=%u", nfss->bsize);
712 seq_printf(m, ",namlen=%u", nfss->namelen);
713
714 #ifdef CONFIG_NFS_V4
715 if (nfss->nfs_client->rpc_ops->version == 4) {
716 seq_printf(m, "\n\tnfsv4:\t");
717 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
718 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
719 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
720 }
721 #endif
722
723 /*
724 * Display security flavor in effect for this mount
725 */
726 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
727 if (auth->au_flavor)
728 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
729
730 /*
731 * Display superblock I/O counters
732 */
733 for_each_possible_cpu(cpu) {
734 struct nfs_iostats *stats;
735
736 preempt_disable();
737 stats = per_cpu_ptr(nfss->io_stats, cpu);
738
739 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
740 totals.events[i] += stats->events[i];
741 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
742 totals.bytes[i] += stats->bytes[i];
743 #ifdef CONFIG_NFS_FSCACHE
744 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
745 totals.fscache[i] += stats->fscache[i];
746 #endif
747
748 preempt_enable();
749 }
750
751 seq_printf(m, "\n\tevents:\t");
752 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
753 seq_printf(m, "%lu ", totals.events[i]);
754 seq_printf(m, "\n\tbytes:\t");
755 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
756 seq_printf(m, "%Lu ", totals.bytes[i]);
757 #ifdef CONFIG_NFS_FSCACHE
758 if (nfss->options & NFS_OPTION_FSCACHE) {
759 seq_printf(m, "\n\tfsc:\t");
760 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
761 seq_printf(m, "%Lu ", totals.bytes[i]);
762 }
763 #endif
764 seq_printf(m, "\n");
765
766 rpc_print_iostats(m, nfss->client);
767
768 return 0;
769 }
770
771 /*
772 * Begin unmount by attempting to remove all automounted mountpoints we added
773 * in response to xdev traversals and referrals
774 */
775 static void nfs_umount_begin(struct super_block *sb)
776 {
777 struct nfs_server *server;
778 struct rpc_clnt *rpc;
779
780 server = NFS_SB(sb);
781 /* -EIO all pending I/O */
782 rpc = server->client_acl;
783 if (!IS_ERR(rpc))
784 rpc_killall_tasks(rpc);
785 rpc = server->client;
786 if (!IS_ERR(rpc))
787 rpc_killall_tasks(rpc);
788 }
789
790 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
791 {
792 struct nfs_parsed_mount_data *data;
793
794 data = kzalloc(sizeof(*data), GFP_KERNEL);
795 if (data) {
796 data->acregmin = NFS_DEF_ACREGMIN;
797 data->acregmax = NFS_DEF_ACREGMAX;
798 data->acdirmin = NFS_DEF_ACDIRMIN;
799 data->acdirmax = NFS_DEF_ACDIRMAX;
800 data->mount_server.port = NFS_UNSPEC_PORT;
801 data->nfs_server.port = NFS_UNSPEC_PORT;
802 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
803 data->auth_flavors[0] = RPC_AUTH_UNIX;
804 data->auth_flavor_len = 1;
805 data->version = version;
806 data->minorversion = 0;
807 }
808 return data;
809 }
810
811 /*
812 * Sanity-check a server address provided by the mount command.
813 *
814 * Address family must be initialized, and address must not be
815 * the ANY address for that family.
816 */
817 static int nfs_verify_server_address(struct sockaddr *addr)
818 {
819 switch (addr->sa_family) {
820 case AF_INET: {
821 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
822 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
823 }
824 case AF_INET6: {
825 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
826 return !ipv6_addr_any(sa);
827 }
828 }
829
830 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
831 return 0;
832 }
833
834 /*
835 * Select between a default port value and a user-specified port value.
836 * If a zero value is set, then autobind will be used.
837 */
838 static void nfs_set_port(struct sockaddr *sap, int *port,
839 const unsigned short default_port)
840 {
841 if (*port == NFS_UNSPEC_PORT)
842 *port = default_port;
843
844 rpc_set_port(sap, *port);
845 }
846
847 /*
848 * Sanity check the NFS transport protocol.
849 *
850 */
851 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
852 {
853 switch (mnt->nfs_server.protocol) {
854 case XPRT_TRANSPORT_UDP:
855 case XPRT_TRANSPORT_TCP:
856 case XPRT_TRANSPORT_RDMA:
857 break;
858 default:
859 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
860 }
861 }
862
863 /*
864 * For text based NFSv2/v3 mounts, the mount protocol transport default
865 * settings should depend upon the specified NFS transport.
866 */
867 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
868 {
869 nfs_validate_transport_protocol(mnt);
870
871 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
872 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
873 return;
874 switch (mnt->nfs_server.protocol) {
875 case XPRT_TRANSPORT_UDP:
876 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
877 break;
878 case XPRT_TRANSPORT_TCP:
879 case XPRT_TRANSPORT_RDMA:
880 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
881 }
882 }
883
884 /*
885 * Parse the value of the 'sec=' option.
886 */
887 static int nfs_parse_security_flavors(char *value,
888 struct nfs_parsed_mount_data *mnt)
889 {
890 substring_t args[MAX_OPT_ARGS];
891
892 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
893
894 switch (match_token(value, nfs_secflavor_tokens, args)) {
895 case Opt_sec_none:
896 mnt->auth_flavors[0] = RPC_AUTH_NULL;
897 break;
898 case Opt_sec_sys:
899 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
900 break;
901 case Opt_sec_krb5:
902 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
903 break;
904 case Opt_sec_krb5i:
905 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
906 break;
907 case Opt_sec_krb5p:
908 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
909 break;
910 case Opt_sec_lkey:
911 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
912 break;
913 case Opt_sec_lkeyi:
914 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
915 break;
916 case Opt_sec_lkeyp:
917 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
918 break;
919 case Opt_sec_spkm:
920 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
921 break;
922 case Opt_sec_spkmi:
923 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
924 break;
925 case Opt_sec_spkmp:
926 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
927 break;
928 default:
929 return 0;
930 }
931
932 mnt->auth_flavor_len = 1;
933 return 1;
934 }
935
936 /*
937 * Error-check and convert a string of mount options from user space into
938 * a data structure. The whole mount string is processed; bad options are
939 * skipped as they are encountered. If there were no errors, return 1;
940 * otherwise return 0 (zero).
941 */
942 static int nfs_parse_mount_options(char *raw,
943 struct nfs_parsed_mount_data *mnt)
944 {
945 char *p, *string, *secdata;
946 int rc, sloppy = 0, invalid_option = 0;
947 unsigned short protofamily = AF_UNSPEC;
948 unsigned short mountfamily = AF_UNSPEC;
949
950 if (!raw) {
951 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
952 return 1;
953 }
954 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
955
956 secdata = alloc_secdata();
957 if (!secdata)
958 goto out_nomem;
959
960 rc = security_sb_copy_data(raw, secdata);
961 if (rc)
962 goto out_security_failure;
963
964 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
965 if (rc)
966 goto out_security_failure;
967
968 free_secdata(secdata);
969
970 while ((p = strsep(&raw, ",")) != NULL) {
971 substring_t args[MAX_OPT_ARGS];
972 unsigned long option;
973 int token;
974
975 if (!*p)
976 continue;
977
978 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
979
980 token = match_token(p, nfs_mount_option_tokens, args);
981 switch (token) {
982
983 /*
984 * boolean options: foo/nofoo
985 */
986 case Opt_soft:
987 mnt->flags |= NFS_MOUNT_SOFT;
988 break;
989 case Opt_hard:
990 mnt->flags &= ~NFS_MOUNT_SOFT;
991 break;
992 case Opt_posix:
993 mnt->flags |= NFS_MOUNT_POSIX;
994 break;
995 case Opt_noposix:
996 mnt->flags &= ~NFS_MOUNT_POSIX;
997 break;
998 case Opt_cto:
999 mnt->flags &= ~NFS_MOUNT_NOCTO;
1000 break;
1001 case Opt_nocto:
1002 mnt->flags |= NFS_MOUNT_NOCTO;
1003 break;
1004 case Opt_ac:
1005 mnt->flags &= ~NFS_MOUNT_NOAC;
1006 break;
1007 case Opt_noac:
1008 mnt->flags |= NFS_MOUNT_NOAC;
1009 break;
1010 case Opt_lock:
1011 mnt->flags &= ~NFS_MOUNT_NONLM;
1012 break;
1013 case Opt_nolock:
1014 mnt->flags |= NFS_MOUNT_NONLM;
1015 break;
1016 case Opt_v2:
1017 mnt->flags &= ~NFS_MOUNT_VER3;
1018 mnt->version = 2;
1019 break;
1020 case Opt_v3:
1021 mnt->flags |= NFS_MOUNT_VER3;
1022 mnt->version = 3;
1023 break;
1024 #ifdef CONFIG_NFS_V4
1025 case Opt_v4:
1026 mnt->flags &= ~NFS_MOUNT_VER3;
1027 mnt->version = 4;
1028 break;
1029 #endif
1030 case Opt_udp:
1031 mnt->flags &= ~NFS_MOUNT_TCP;
1032 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1033 break;
1034 case Opt_tcp:
1035 mnt->flags |= NFS_MOUNT_TCP;
1036 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1037 break;
1038 case Opt_rdma:
1039 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1040 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1041 xprt_load_transport(p);
1042 break;
1043 case Opt_acl:
1044 mnt->flags &= ~NFS_MOUNT_NOACL;
1045 break;
1046 case Opt_noacl:
1047 mnt->flags |= NFS_MOUNT_NOACL;
1048 break;
1049 case Opt_rdirplus:
1050 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1051 break;
1052 case Opt_nordirplus:
1053 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1054 break;
1055 case Opt_sharecache:
1056 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1057 break;
1058 case Opt_nosharecache:
1059 mnt->flags |= NFS_MOUNT_UNSHARED;
1060 break;
1061 case Opt_resvport:
1062 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1063 break;
1064 case Opt_noresvport:
1065 mnt->flags |= NFS_MOUNT_NORESVPORT;
1066 break;
1067 case Opt_fscache:
1068 mnt->options |= NFS_OPTION_FSCACHE;
1069 kfree(mnt->fscache_uniq);
1070 mnt->fscache_uniq = NULL;
1071 break;
1072 case Opt_nofscache:
1073 mnt->options &= ~NFS_OPTION_FSCACHE;
1074 kfree(mnt->fscache_uniq);
1075 mnt->fscache_uniq = NULL;
1076 break;
1077
1078 /*
1079 * options that take numeric values
1080 */
1081 case Opt_port:
1082 string = match_strdup(args);
1083 if (string == NULL)
1084 goto out_nomem;
1085 rc = strict_strtoul(string, 10, &option);
1086 kfree(string);
1087 if (rc != 0 || option > USHRT_MAX)
1088 goto out_invalid_value;
1089 mnt->nfs_server.port = option;
1090 break;
1091 case Opt_rsize:
1092 string = match_strdup(args);
1093 if (string == NULL)
1094 goto out_nomem;
1095 rc = strict_strtoul(string, 10, &option);
1096 kfree(string);
1097 if (rc != 0)
1098 goto out_invalid_value;
1099 mnt->rsize = option;
1100 break;
1101 case Opt_wsize:
1102 string = match_strdup(args);
1103 if (string == NULL)
1104 goto out_nomem;
1105 rc = strict_strtoul(string, 10, &option);
1106 kfree(string);
1107 if (rc != 0)
1108 goto out_invalid_value;
1109 mnt->wsize = option;
1110 break;
1111 case Opt_bsize:
1112 string = match_strdup(args);
1113 if (string == NULL)
1114 goto out_nomem;
1115 rc = strict_strtoul(string, 10, &option);
1116 kfree(string);
1117 if (rc != 0)
1118 goto out_invalid_value;
1119 mnt->bsize = option;
1120 break;
1121 case Opt_timeo:
1122 string = match_strdup(args);
1123 if (string == NULL)
1124 goto out_nomem;
1125 rc = strict_strtoul(string, 10, &option);
1126 kfree(string);
1127 if (rc != 0 || option == 0)
1128 goto out_invalid_value;
1129 mnt->timeo = option;
1130 break;
1131 case Opt_retrans:
1132 string = match_strdup(args);
1133 if (string == NULL)
1134 goto out_nomem;
1135 rc = strict_strtoul(string, 10, &option);
1136 kfree(string);
1137 if (rc != 0 || option == 0)
1138 goto out_invalid_value;
1139 mnt->retrans = option;
1140 break;
1141 case Opt_acregmin:
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->acregmin = option;
1150 break;
1151 case Opt_acregmax:
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)
1158 goto out_invalid_value;
1159 mnt->acregmax = option;
1160 break;
1161 case Opt_acdirmin:
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 goto out_invalid_value;
1169 mnt->acdirmin = option;
1170 break;
1171 case Opt_acdirmax:
1172 string = match_strdup(args);
1173 if (string == NULL)
1174 goto out_nomem;
1175 rc = strict_strtoul(string, 10, &option);
1176 kfree(string);
1177 if (rc != 0)
1178 goto out_invalid_value;
1179 mnt->acdirmax = option;
1180 break;
1181 case Opt_actimeo:
1182 string = match_strdup(args);
1183 if (string == NULL)
1184 goto out_nomem;
1185 rc = strict_strtoul(string, 10, &option);
1186 kfree(string);
1187 if (rc != 0)
1188 goto out_invalid_value;
1189 mnt->acregmin = mnt->acregmax =
1190 mnt->acdirmin = mnt->acdirmax = option;
1191 break;
1192 case Opt_namelen:
1193 string = match_strdup(args);
1194 if (string == NULL)
1195 goto out_nomem;
1196 rc = strict_strtoul(string, 10, &option);
1197 kfree(string);
1198 if (rc != 0)
1199 goto out_invalid_value;
1200 mnt->namlen = option;
1201 break;
1202 case Opt_mountport:
1203 string = match_strdup(args);
1204 if (string == NULL)
1205 goto out_nomem;
1206 rc = strict_strtoul(string, 10, &option);
1207 kfree(string);
1208 if (rc != 0 || option > USHRT_MAX)
1209 goto out_invalid_value;
1210 mnt->mount_server.port = option;
1211 break;
1212 case Opt_mountvers:
1213 string = match_strdup(args);
1214 if (string == NULL)
1215 goto out_nomem;
1216 rc = strict_strtoul(string, 10, &option);
1217 kfree(string);
1218 if (rc != 0 ||
1219 option < NFS_MNT_VERSION ||
1220 option > NFS_MNT3_VERSION)
1221 goto out_invalid_value;
1222 mnt->mount_server.version = option;
1223 break;
1224 case Opt_nfsvers:
1225 string = match_strdup(args);
1226 if (string == NULL)
1227 goto out_nomem;
1228 rc = strict_strtoul(string, 10, &option);
1229 kfree(string);
1230 if (rc != 0)
1231 goto out_invalid_value;
1232 switch (option) {
1233 case NFS2_VERSION:
1234 mnt->flags &= ~NFS_MOUNT_VER3;
1235 mnt->version = 2;
1236 break;
1237 case NFS3_VERSION:
1238 mnt->flags |= NFS_MOUNT_VER3;
1239 mnt->version = 3;
1240 break;
1241 #ifdef CONFIG_NFS_V4
1242 case NFS4_VERSION:
1243 mnt->flags &= ~NFS_MOUNT_VER3;
1244 mnt->version = 4;
1245 break;
1246 #endif
1247 default:
1248 goto out_invalid_value;
1249 }
1250 break;
1251 case Opt_minorversion:
1252 string = match_strdup(args);
1253 if (string == NULL)
1254 goto out_nomem;
1255 rc = strict_strtoul(string, 10, &option);
1256 kfree(string);
1257 if (rc != 0)
1258 goto out_invalid_value;
1259 if (option > NFS4_MAX_MINOR_VERSION)
1260 goto out_invalid_value;
1261 mnt->minorversion = option;
1262 break;
1263
1264 /*
1265 * options that take text values
1266 */
1267 case Opt_sec:
1268 string = match_strdup(args);
1269 if (string == NULL)
1270 goto out_nomem;
1271 rc = nfs_parse_security_flavors(string, mnt);
1272 kfree(string);
1273 if (!rc) {
1274 dfprintk(MOUNT, "NFS: unrecognized "
1275 "security flavor\n");
1276 return 0;
1277 }
1278 break;
1279 case Opt_proto:
1280 string = match_strdup(args);
1281 if (string == NULL)
1282 goto out_nomem;
1283 token = match_token(string,
1284 nfs_xprt_protocol_tokens, args);
1285
1286 protofamily = AF_INET;
1287 switch (token) {
1288 case Opt_xprt_udp6:
1289 protofamily = AF_INET6;
1290 case Opt_xprt_udp:
1291 mnt->flags &= ~NFS_MOUNT_TCP;
1292 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1293 kfree(string);
1294 break;
1295 case Opt_xprt_tcp6:
1296 protofamily = AF_INET6;
1297 case Opt_xprt_tcp:
1298 mnt->flags |= NFS_MOUNT_TCP;
1299 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1300 kfree(string);
1301 break;
1302 case Opt_xprt_rdma:
1303 /* vector side protocols to TCP */
1304 mnt->flags |= NFS_MOUNT_TCP;
1305 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1306 xprt_load_transport(string);
1307 kfree(string);
1308 break;
1309 default:
1310 dfprintk(MOUNT, "NFS: unrecognized "
1311 "transport protocol\n");
1312 kfree(string);
1313 return 0;
1314 }
1315 break;
1316 case Opt_mountproto:
1317 string = match_strdup(args);
1318 if (string == NULL)
1319 goto out_nomem;
1320 token = match_token(string,
1321 nfs_xprt_protocol_tokens, args);
1322 kfree(string);
1323
1324 mountfamily = AF_INET;
1325 switch (token) {
1326 case Opt_xprt_udp6:
1327 mountfamily = AF_INET6;
1328 case Opt_xprt_udp:
1329 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1330 break;
1331 case Opt_xprt_tcp6:
1332 mountfamily = AF_INET6;
1333 case Opt_xprt_tcp:
1334 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1335 break;
1336 case Opt_xprt_rdma: /* not used for side protocols */
1337 default:
1338 dfprintk(MOUNT, "NFS: unrecognized "
1339 "transport protocol\n");
1340 return 0;
1341 }
1342 break;
1343 case Opt_addr:
1344 string = match_strdup(args);
1345 if (string == NULL)
1346 goto out_nomem;
1347 mnt->nfs_server.addrlen =
1348 rpc_pton(string, strlen(string),
1349 (struct sockaddr *)
1350 &mnt->nfs_server.address,
1351 sizeof(mnt->nfs_server.address));
1352 kfree(string);
1353 if (mnt->nfs_server.addrlen == 0)
1354 goto out_invalid_address;
1355 break;
1356 case Opt_clientaddr:
1357 string = match_strdup(args);
1358 if (string == NULL)
1359 goto out_nomem;
1360 kfree(mnt->client_address);
1361 mnt->client_address = string;
1362 break;
1363 case Opt_mounthost:
1364 string = match_strdup(args);
1365 if (string == NULL)
1366 goto out_nomem;
1367 kfree(mnt->mount_server.hostname);
1368 mnt->mount_server.hostname = string;
1369 break;
1370 case Opt_mountaddr:
1371 string = match_strdup(args);
1372 if (string == NULL)
1373 goto out_nomem;
1374 mnt->mount_server.addrlen =
1375 rpc_pton(string, strlen(string),
1376 (struct sockaddr *)
1377 &mnt->mount_server.address,
1378 sizeof(mnt->mount_server.address));
1379 kfree(string);
1380 if (mnt->mount_server.addrlen == 0)
1381 goto out_invalid_address;
1382 break;
1383 case Opt_lookupcache:
1384 string = match_strdup(args);
1385 if (string == NULL)
1386 goto out_nomem;
1387 token = match_token(string,
1388 nfs_lookupcache_tokens, args);
1389 kfree(string);
1390 switch (token) {
1391 case Opt_lookupcache_all:
1392 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1393 break;
1394 case Opt_lookupcache_positive:
1395 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1396 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1397 break;
1398 case Opt_lookupcache_none:
1399 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1400 break;
1401 default:
1402 dfprintk(MOUNT, "NFS: invalid "
1403 "lookupcache argument\n");
1404 return 0;
1405 };
1406 break;
1407 case Opt_fscache_uniq:
1408 string = match_strdup(args);
1409 if (string == NULL)
1410 goto out_nomem;
1411 kfree(mnt->fscache_uniq);
1412 mnt->fscache_uniq = string;
1413 mnt->options |= NFS_OPTION_FSCACHE;
1414 break;
1415
1416 /*
1417 * Special options
1418 */
1419 case Opt_sloppy:
1420 sloppy = 1;
1421 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1422 break;
1423 case Opt_userspace:
1424 case Opt_deprecated:
1425 dfprintk(MOUNT, "NFS: ignoring mount option "
1426 "'%s'\n", p);
1427 break;
1428
1429 default:
1430 invalid_option = 1;
1431 dfprintk(MOUNT, "NFS: unrecognized mount option "
1432 "'%s'\n", p);
1433 }
1434 }
1435
1436 if (!sloppy && invalid_option)
1437 return 0;
1438
1439 /*
1440 * verify that any proto=/mountproto= options match the address
1441 * familiies in the addr=/mountaddr= options.
1442 */
1443 if (protofamily != AF_UNSPEC &&
1444 protofamily != mnt->nfs_server.address.ss_family)
1445 goto out_proto_mismatch;
1446
1447 if (mountfamily != AF_UNSPEC) {
1448 if (mnt->mount_server.addrlen) {
1449 if (mountfamily != mnt->mount_server.address.ss_family)
1450 goto out_mountproto_mismatch;
1451 } else {
1452 if (mountfamily != mnt->nfs_server.address.ss_family)
1453 goto out_mountproto_mismatch;
1454 }
1455 }
1456
1457 return 1;
1458
1459 out_mountproto_mismatch:
1460 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1461 "option\n");
1462 return 0;
1463 out_proto_mismatch:
1464 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1465 return 0;
1466 out_invalid_address:
1467 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1468 return 0;
1469 out_invalid_value:
1470 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1471 return 0;
1472 out_nomem:
1473 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1474 return 0;
1475 out_security_failure:
1476 free_secdata(secdata);
1477 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1478 return 0;
1479 }
1480
1481 /*
1482 * Match the requested auth flavors with the list returned by
1483 * the server. Returns zero and sets the mount's authentication
1484 * flavor on success; returns -EACCES if server does not support
1485 * the requested flavor.
1486 */
1487 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1488 struct nfs_mount_request *request)
1489 {
1490 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1491
1492 /*
1493 * Certain releases of Linux's mountd return an empty
1494 * flavor list. To prevent behavioral regression with
1495 * these servers (ie. rejecting mounts that used to
1496 * succeed), revert to pre-2.6.32 behavior (no checking)
1497 * if the returned flavor list is empty.
1498 */
1499 if (server_authlist_len == 0)
1500 return 0;
1501
1502 /*
1503 * We avoid sophisticated negotiating here, as there are
1504 * plenty of cases where we can get it wrong, providing
1505 * either too little or too much security.
1506 *
1507 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1508 * flavor listed first. However, some servers list
1509 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1510 * preferred default, in args->auth_flavors[0] if user
1511 * didn't specify sec= mount option.
1512 */
1513 for (i = 0; i < args->auth_flavor_len; i++)
1514 for (j = 0; j < server_authlist_len; j++)
1515 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1516 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1517 request->auth_flavs[j]);
1518 args->auth_flavors[0] = request->auth_flavs[j];
1519 return 0;
1520 }
1521
1522 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1523 nfs_umount(request);
1524 return -EACCES;
1525 }
1526
1527 /*
1528 * Use the remote server's MOUNT service to request the NFS file handle
1529 * corresponding to the provided path.
1530 */
1531 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1532 struct nfs_fh *root_fh)
1533 {
1534 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1535 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1536 struct nfs_mount_request request = {
1537 .sap = (struct sockaddr *)
1538 &args->mount_server.address,
1539 .dirpath = args->nfs_server.export_path,
1540 .protocol = args->mount_server.protocol,
1541 .fh = root_fh,
1542 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1543 .auth_flav_len = &server_authlist_len,
1544 .auth_flavs = server_authlist,
1545 };
1546 int status;
1547
1548 if (args->mount_server.version == 0) {
1549 switch (args->version) {
1550 default:
1551 args->mount_server.version = NFS_MNT3_VERSION;
1552 break;
1553 case 2:
1554 args->mount_server.version = NFS_MNT_VERSION;
1555 }
1556 }
1557 request.version = args->mount_server.version;
1558
1559 if (args->mount_server.hostname)
1560 request.hostname = args->mount_server.hostname;
1561 else
1562 request.hostname = args->nfs_server.hostname;
1563
1564 /*
1565 * Construct the mount server's address.
1566 */
1567 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1568 memcpy(request.sap, &args->nfs_server.address,
1569 args->nfs_server.addrlen);
1570 args->mount_server.addrlen = args->nfs_server.addrlen;
1571 }
1572 request.salen = args->mount_server.addrlen;
1573 nfs_set_port(request.sap, &args->mount_server.port, 0);
1574
1575 /*
1576 * Now ask the mount server to map our export path
1577 * to a file handle.
1578 */
1579 status = nfs_mount(&request);
1580 if (status != 0) {
1581 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1582 request.hostname, status);
1583 return status;
1584 }
1585
1586 /*
1587 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1588 */
1589 if (args->mount_server.version != NFS_MNT3_VERSION)
1590 return 0;
1591 return nfs_walk_authlist(args, &request);
1592 }
1593
1594 static int nfs_parse_simple_hostname(const char *dev_name,
1595 char **hostname, size_t maxnamlen,
1596 char **export_path, size_t maxpathlen)
1597 {
1598 size_t len;
1599 char *colon, *comma;
1600
1601 colon = strchr(dev_name, ':');
1602 if (colon == NULL)
1603 goto out_bad_devname;
1604
1605 len = colon - dev_name;
1606 if (len > maxnamlen)
1607 goto out_hostname;
1608
1609 /* N.B. caller will free nfs_server.hostname in all cases */
1610 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1611 if (!*hostname)
1612 goto out_nomem;
1613
1614 /* kill possible hostname list: not supported */
1615 comma = strchr(*hostname, ',');
1616 if (comma != NULL) {
1617 if (comma == *hostname)
1618 goto out_bad_devname;
1619 *comma = '\0';
1620 }
1621
1622 colon++;
1623 len = strlen(colon);
1624 if (len > maxpathlen)
1625 goto out_path;
1626 *export_path = kstrndup(colon, len, GFP_KERNEL);
1627 if (!*export_path)
1628 goto out_nomem;
1629
1630 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1631 return 0;
1632
1633 out_bad_devname:
1634 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1635 return -EINVAL;
1636
1637 out_nomem:
1638 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1639 return -ENOMEM;
1640
1641 out_hostname:
1642 dfprintk(MOUNT, "NFS: server hostname too long\n");
1643 return -ENAMETOOLONG;
1644
1645 out_path:
1646 dfprintk(MOUNT, "NFS: export pathname too long\n");
1647 return -ENAMETOOLONG;
1648 }
1649
1650 /*
1651 * Hostname has square brackets around it because it contains one or
1652 * more colons. We look for the first closing square bracket, and a
1653 * colon must follow it.
1654 */
1655 static int nfs_parse_protected_hostname(const char *dev_name,
1656 char **hostname, size_t maxnamlen,
1657 char **export_path, size_t maxpathlen)
1658 {
1659 size_t len;
1660 char *start, *end;
1661
1662 start = (char *)(dev_name + 1);
1663
1664 end = strchr(start, ']');
1665 if (end == NULL)
1666 goto out_bad_devname;
1667 if (*(end + 1) != ':')
1668 goto out_bad_devname;
1669
1670 len = end - start;
1671 if (len > maxnamlen)
1672 goto out_hostname;
1673
1674 /* N.B. caller will free nfs_server.hostname in all cases */
1675 *hostname = kstrndup(start, len, GFP_KERNEL);
1676 if (*hostname == NULL)
1677 goto out_nomem;
1678
1679 end += 2;
1680 len = strlen(end);
1681 if (len > maxpathlen)
1682 goto out_path;
1683 *export_path = kstrndup(end, len, GFP_KERNEL);
1684 if (!*export_path)
1685 goto out_nomem;
1686
1687 return 0;
1688
1689 out_bad_devname:
1690 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1691 return -EINVAL;
1692
1693 out_nomem:
1694 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1695 return -ENOMEM;
1696
1697 out_hostname:
1698 dfprintk(MOUNT, "NFS: server hostname too long\n");
1699 return -ENAMETOOLONG;
1700
1701 out_path:
1702 dfprintk(MOUNT, "NFS: export pathname too long\n");
1703 return -ENAMETOOLONG;
1704 }
1705
1706 /*
1707 * Split "dev_name" into "hostname:export_path".
1708 *
1709 * The leftmost colon demarks the split between the server's hostname
1710 * and the export path. If the hostname starts with a left square
1711 * bracket, then it may contain colons.
1712 *
1713 * Note: caller frees hostname and export path, even on error.
1714 */
1715 static int nfs_parse_devname(const char *dev_name,
1716 char **hostname, size_t maxnamlen,
1717 char **export_path, size_t maxpathlen)
1718 {
1719 if (*dev_name == '[')
1720 return nfs_parse_protected_hostname(dev_name,
1721 hostname, maxnamlen,
1722 export_path, maxpathlen);
1723
1724 return nfs_parse_simple_hostname(dev_name,
1725 hostname, maxnamlen,
1726 export_path, maxpathlen);
1727 }
1728
1729 /*
1730 * Validate the NFS2/NFS3 mount data
1731 * - fills in the mount root filehandle
1732 *
1733 * For option strings, user space handles the following behaviors:
1734 *
1735 * + DNS: mapping server host name to IP address ("addr=" option)
1736 *
1737 * + failure mode: how to behave if a mount request can't be handled
1738 * immediately ("fg/bg" option)
1739 *
1740 * + retry: how often to retry a mount request ("retry=" option)
1741 *
1742 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1743 * mountproto=tcp after mountproto=udp, and so on
1744 */
1745 static int nfs_validate_mount_data(void *options,
1746 struct nfs_parsed_mount_data *args,
1747 struct nfs_fh *mntfh,
1748 const char *dev_name)
1749 {
1750 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1751 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1752
1753 if (data == NULL)
1754 goto out_no_data;
1755
1756 switch (data->version) {
1757 case 1:
1758 data->namlen = 0;
1759 case 2:
1760 data->bsize = 0;
1761 case 3:
1762 if (data->flags & NFS_MOUNT_VER3)
1763 goto out_no_v3;
1764 data->root.size = NFS2_FHSIZE;
1765 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1766 case 4:
1767 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1768 goto out_no_sec;
1769 case 5:
1770 memset(data->context, 0, sizeof(data->context));
1771 case 6:
1772 if (data->flags & NFS_MOUNT_VER3) {
1773 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1774 goto out_invalid_fh;
1775 mntfh->size = data->root.size;
1776 args->version = 3;
1777 } else {
1778 mntfh->size = NFS2_FHSIZE;
1779 args->version = 2;
1780 }
1781
1782
1783 memcpy(mntfh->data, data->root.data, mntfh->size);
1784 if (mntfh->size < sizeof(mntfh->data))
1785 memset(mntfh->data + mntfh->size, 0,
1786 sizeof(mntfh->data) - mntfh->size);
1787
1788 /*
1789 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1790 * can deal with.
1791 */
1792 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1793 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1794 args->rsize = data->rsize;
1795 args->wsize = data->wsize;
1796 args->timeo = data->timeo;
1797 args->retrans = data->retrans;
1798 args->acregmin = data->acregmin;
1799 args->acregmax = data->acregmax;
1800 args->acdirmin = data->acdirmin;
1801 args->acdirmax = data->acdirmax;
1802
1803 memcpy(sap, &data->addr, sizeof(data->addr));
1804 args->nfs_server.addrlen = sizeof(data->addr);
1805 if (!nfs_verify_server_address(sap))
1806 goto out_no_address;
1807
1808 if (!(data->flags & NFS_MOUNT_TCP))
1809 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1810 /* N.B. caller will free nfs_server.hostname in all cases */
1811 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1812 args->namlen = data->namlen;
1813 args->bsize = data->bsize;
1814
1815 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1816 args->auth_flavors[0] = data->pseudoflavor;
1817 if (!args->nfs_server.hostname)
1818 goto out_nomem;
1819
1820 /*
1821 * The legacy version 6 binary mount data from userspace has a
1822 * field used only to transport selinux information into the
1823 * the kernel. To continue to support that functionality we
1824 * have a touch of selinux knowledge here in the NFS code. The
1825 * userspace code converted context=blah to just blah so we are
1826 * converting back to the full string selinux understands.
1827 */
1828 if (data->context[0]){
1829 #ifdef CONFIG_SECURITY_SELINUX
1830 int rc;
1831 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1832 if (!opts_str)
1833 return -ENOMEM;
1834 strcpy(opts_str, "context=");
1835 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1836 strcat(opts_str, &data->context[0]);
1837 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1838 kfree(opts_str);
1839 if (rc)
1840 return rc;
1841 #else
1842 return -EINVAL;
1843 #endif
1844 }
1845
1846 break;
1847 default: {
1848 int status;
1849
1850 if (nfs_parse_mount_options((char *)options, args) == 0)
1851 return -EINVAL;
1852
1853 if (!nfs_verify_server_address(sap))
1854 goto out_no_address;
1855
1856 if (args->version == 4)
1857 #ifdef CONFIG_NFS_V4
1858 return nfs4_validate_text_mount_data(options,
1859 args, dev_name);
1860 #else
1861 goto out_v4_not_compiled;
1862 #endif
1863
1864 nfs_set_port(sap, &args->nfs_server.port, 0);
1865
1866 nfs_set_mount_transport_protocol(args);
1867
1868 status = nfs_parse_devname(dev_name,
1869 &args->nfs_server.hostname,
1870 PAGE_SIZE,
1871 &args->nfs_server.export_path,
1872 NFS_MAXPATHLEN);
1873 if (!status)
1874 status = nfs_try_mount(args, mntfh);
1875
1876 kfree(args->nfs_server.export_path);
1877 args->nfs_server.export_path = NULL;
1878
1879 if (status)
1880 return status;
1881
1882 break;
1883 }
1884 }
1885
1886 #ifndef CONFIG_NFS_V3
1887 if (args->version == 3)
1888 goto out_v3_not_compiled;
1889 #endif /* !CONFIG_NFS_V3 */
1890
1891 return 0;
1892
1893 out_no_data:
1894 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1895 return -EINVAL;
1896
1897 out_no_v3:
1898 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1899 data->version);
1900 return -EINVAL;
1901
1902 out_no_sec:
1903 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1904 return -EINVAL;
1905
1906 #ifndef CONFIG_NFS_V3
1907 out_v3_not_compiled:
1908 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1909 return -EPROTONOSUPPORT;
1910 #endif /* !CONFIG_NFS_V3 */
1911
1912 #ifndef CONFIG_NFS_V4
1913 out_v4_not_compiled:
1914 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1915 return -EPROTONOSUPPORT;
1916 #endif /* !CONFIG_NFS_V4 */
1917
1918 out_nomem:
1919 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1920 return -ENOMEM;
1921
1922 out_no_address:
1923 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1924 return -EINVAL;
1925
1926 out_invalid_fh:
1927 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1928 return -EINVAL;
1929 }
1930
1931 static int
1932 nfs_compare_remount_data(struct nfs_server *nfss,
1933 struct nfs_parsed_mount_data *data)
1934 {
1935 if (data->flags != nfss->flags ||
1936 data->rsize != nfss->rsize ||
1937 data->wsize != nfss->wsize ||
1938 data->retrans != nfss->client->cl_timeout->to_retries ||
1939 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1940 data->acregmin != nfss->acregmin / HZ ||
1941 data->acregmax != nfss->acregmax / HZ ||
1942 data->acdirmin != nfss->acdirmin / HZ ||
1943 data->acdirmax != nfss->acdirmax / HZ ||
1944 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1945 data->nfs_server.port != nfss->port ||
1946 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1947 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1948 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1949 return -EINVAL;
1950
1951 return 0;
1952 }
1953
1954 static int
1955 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1956 {
1957 int error;
1958 struct nfs_server *nfss = sb->s_fs_info;
1959 struct nfs_parsed_mount_data *data;
1960 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1961 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1962 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1963
1964 /*
1965 * Userspace mount programs that send binary options generally send
1966 * them populated with default values. We have no way to know which
1967 * ones were explicitly specified. Fall back to legacy behavior and
1968 * just return success.
1969 */
1970 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1971 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1972 options->version <= 6))))
1973 return 0;
1974
1975 data = kzalloc(sizeof(*data), GFP_KERNEL);
1976 if (data == NULL)
1977 return -ENOMEM;
1978
1979 /* fill out struct with values from existing mount */
1980 data->flags = nfss->flags;
1981 data->rsize = nfss->rsize;
1982 data->wsize = nfss->wsize;
1983 data->retrans = nfss->client->cl_timeout->to_retries;
1984 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1985 data->acregmin = nfss->acregmin / HZ;
1986 data->acregmax = nfss->acregmax / HZ;
1987 data->acdirmin = nfss->acdirmin / HZ;
1988 data->acdirmax = nfss->acdirmax / HZ;
1989 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1990 data->nfs_server.port = nfss->port;
1991 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1992 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1993 data->nfs_server.addrlen);
1994
1995 /* overwrite those values with any that were specified */
1996 error = nfs_parse_mount_options((char *)options, data);
1997 if (error < 0)
1998 goto out;
1999
2000 /* compare new mount options with old ones */
2001 error = nfs_compare_remount_data(nfss, data);
2002 out:
2003 kfree(data);
2004 return error;
2005 }
2006
2007 /*
2008 * Initialise the common bits of the superblock
2009 */
2010 static inline void nfs_initialise_sb(struct super_block *sb)
2011 {
2012 struct nfs_server *server = NFS_SB(sb);
2013
2014 sb->s_magic = NFS_SUPER_MAGIC;
2015
2016 /* We probably want something more informative here */
2017 snprintf(sb->s_id, sizeof(sb->s_id),
2018 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2019
2020 if (sb->s_blocksize == 0)
2021 sb->s_blocksize = nfs_block_bits(server->wsize,
2022 &sb->s_blocksize_bits);
2023
2024 if (server->flags & NFS_MOUNT_NOAC)
2025 sb->s_flags |= MS_SYNCHRONOUS;
2026
2027 sb->s_bdi = &server->backing_dev_info;
2028
2029 nfs_super_set_maxbytes(sb, server->maxfilesize);
2030 }
2031
2032 /*
2033 * Finish setting up an NFS2/3 superblock
2034 */
2035 static void nfs_fill_super(struct super_block *sb,
2036 struct nfs_parsed_mount_data *data)
2037 {
2038 struct nfs_server *server = NFS_SB(sb);
2039
2040 sb->s_blocksize_bits = 0;
2041 sb->s_blocksize = 0;
2042 if (data->bsize)
2043 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2044
2045 if (server->nfs_client->rpc_ops->version == 3) {
2046 /* The VFS shouldn't apply the umask to mode bits. We will do
2047 * so ourselves when necessary.
2048 */
2049 sb->s_flags |= MS_POSIXACL;
2050 sb->s_time_gran = 1;
2051 }
2052
2053 sb->s_op = &nfs_sops;
2054 nfs_initialise_sb(sb);
2055 }
2056
2057 /*
2058 * Finish setting up a cloned NFS2/3 superblock
2059 */
2060 static void nfs_clone_super(struct super_block *sb,
2061 const struct super_block *old_sb)
2062 {
2063 struct nfs_server *server = NFS_SB(sb);
2064
2065 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2066 sb->s_blocksize = old_sb->s_blocksize;
2067 sb->s_maxbytes = old_sb->s_maxbytes;
2068
2069 if (server->nfs_client->rpc_ops->version == 3) {
2070 /* The VFS shouldn't apply the umask to mode bits. We will do
2071 * so ourselves when necessary.
2072 */
2073 sb->s_flags |= MS_POSIXACL;
2074 sb->s_time_gran = 1;
2075 }
2076
2077 sb->s_op = old_sb->s_op;
2078 nfs_initialise_sb(sb);
2079 }
2080
2081 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2082 {
2083 const struct nfs_server *a = s->s_fs_info;
2084 const struct rpc_clnt *clnt_a = a->client;
2085 const struct rpc_clnt *clnt_b = b->client;
2086
2087 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2088 goto Ebusy;
2089 if (a->nfs_client != b->nfs_client)
2090 goto Ebusy;
2091 if (a->flags != b->flags)
2092 goto Ebusy;
2093 if (a->wsize != b->wsize)
2094 goto Ebusy;
2095 if (a->rsize != b->rsize)
2096 goto Ebusy;
2097 if (a->acregmin != b->acregmin)
2098 goto Ebusy;
2099 if (a->acregmax != b->acregmax)
2100 goto Ebusy;
2101 if (a->acdirmin != b->acdirmin)
2102 goto Ebusy;
2103 if (a->acdirmax != b->acdirmax)
2104 goto Ebusy;
2105 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2106 goto Ebusy;
2107 return 1;
2108 Ebusy:
2109 return 0;
2110 }
2111
2112 struct nfs_sb_mountdata {
2113 struct nfs_server *server;
2114 int mntflags;
2115 };
2116
2117 static int nfs_set_super(struct super_block *s, void *data)
2118 {
2119 struct nfs_sb_mountdata *sb_mntdata = data;
2120 struct nfs_server *server = sb_mntdata->server;
2121 int ret;
2122
2123 s->s_flags = sb_mntdata->mntflags;
2124 s->s_fs_info = server;
2125 ret = set_anon_super(s, server);
2126 if (ret == 0)
2127 server->s_dev = s->s_dev;
2128 return ret;
2129 }
2130
2131 static int nfs_compare_super_address(struct nfs_server *server1,
2132 struct nfs_server *server2)
2133 {
2134 struct sockaddr *sap1, *sap2;
2135
2136 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2137 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2138
2139 if (sap1->sa_family != sap2->sa_family)
2140 return 0;
2141
2142 switch (sap1->sa_family) {
2143 case AF_INET: {
2144 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2145 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2146 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2147 return 0;
2148 if (sin1->sin_port != sin2->sin_port)
2149 return 0;
2150 break;
2151 }
2152 case AF_INET6: {
2153 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2154 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2155 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2156 return 0;
2157 if (sin1->sin6_port != sin2->sin6_port)
2158 return 0;
2159 break;
2160 }
2161 default:
2162 return 0;
2163 }
2164
2165 return 1;
2166 }
2167
2168 static int nfs_compare_super(struct super_block *sb, void *data)
2169 {
2170 struct nfs_sb_mountdata *sb_mntdata = data;
2171 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2172 int mntflags = sb_mntdata->mntflags;
2173
2174 if (!nfs_compare_super_address(old, server))
2175 return 0;
2176 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2177 if (old->flags & NFS_MOUNT_UNSHARED)
2178 return 0;
2179 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2180 return 0;
2181 return nfs_compare_mount_options(sb, server, mntflags);
2182 }
2183
2184 static int nfs_bdi_register(struct nfs_server *server)
2185 {
2186 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2187 }
2188
2189 static int nfs_get_sb(struct file_system_type *fs_type,
2190 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2191 {
2192 struct nfs_server *server = NULL;
2193 struct super_block *s;
2194 struct nfs_parsed_mount_data *data;
2195 struct nfs_fh *mntfh;
2196 struct dentry *mntroot;
2197 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2198 struct nfs_sb_mountdata sb_mntdata = {
2199 .mntflags = flags,
2200 };
2201 int error = -ENOMEM;
2202
2203 data = nfs_alloc_parsed_mount_data(3);
2204 mntfh = nfs_alloc_fhandle();
2205 if (data == NULL || mntfh == NULL)
2206 goto out_free_fh;
2207
2208 security_init_mnt_opts(&data->lsm_opts);
2209
2210 /* Validate the mount data */
2211 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2212 if (error < 0)
2213 goto out;
2214
2215 #ifdef CONFIG_NFS_V4
2216 if (data->version == 4) {
2217 error = nfs4_try_mount(flags, dev_name, data, mnt);
2218 kfree(data->client_address);
2219 kfree(data->nfs_server.export_path);
2220 goto out;
2221 }
2222 #endif /* CONFIG_NFS_V4 */
2223
2224 /* Get a volume representation */
2225 server = nfs_create_server(data, mntfh);
2226 if (IS_ERR(server)) {
2227 error = PTR_ERR(server);
2228 goto out;
2229 }
2230 sb_mntdata.server = server;
2231
2232 if (server->flags & NFS_MOUNT_UNSHARED)
2233 compare_super = NULL;
2234
2235 /* Get a superblock - note that we may end up sharing one that already exists */
2236 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2237 if (IS_ERR(s)) {
2238 error = PTR_ERR(s);
2239 goto out_err_nosb;
2240 }
2241
2242 if (s->s_fs_info != server) {
2243 nfs_free_server(server);
2244 server = NULL;
2245 } else {
2246 error = nfs_bdi_register(server);
2247 if (error)
2248 goto error_splat_bdi;
2249 }
2250
2251 if (!s->s_root) {
2252 /* initial superblock/root creation */
2253 nfs_fill_super(s, data);
2254 nfs_fscache_get_super_cookie(
2255 s, data ? data->fscache_uniq : NULL, NULL);
2256 }
2257
2258 mntroot = nfs_get_root(s, mntfh);
2259 if (IS_ERR(mntroot)) {
2260 error = PTR_ERR(mntroot);
2261 goto error_splat_super;
2262 }
2263
2264 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2265 if (error)
2266 goto error_splat_root;
2267
2268 s->s_flags |= MS_ACTIVE;
2269 mnt->mnt_sb = s;
2270 mnt->mnt_root = mntroot;
2271 error = 0;
2272
2273 out:
2274 kfree(data->nfs_server.hostname);
2275 kfree(data->mount_server.hostname);
2276 kfree(data->fscache_uniq);
2277 security_free_mnt_opts(&data->lsm_opts);
2278 out_free_fh:
2279 nfs_free_fhandle(mntfh);
2280 kfree(data);
2281 return error;
2282
2283 out_err_nosb:
2284 nfs_free_server(server);
2285 goto out;
2286
2287 error_splat_root:
2288 dput(mntroot);
2289 error_splat_super:
2290 if (server && !s->s_root)
2291 bdi_unregister(&server->backing_dev_info);
2292 error_splat_bdi:
2293 deactivate_locked_super(s);
2294 goto out;
2295 }
2296
2297 /*
2298 * Ensure that we unregister the bdi before kill_anon_super
2299 * releases the device name
2300 */
2301 static void nfs_put_super(struct super_block *s)
2302 {
2303 struct nfs_server *server = NFS_SB(s);
2304
2305 bdi_unregister(&server->backing_dev_info);
2306 }
2307
2308 /*
2309 * Destroy an NFS2/3 superblock
2310 */
2311 static void nfs_kill_super(struct super_block *s)
2312 {
2313 struct nfs_server *server = NFS_SB(s);
2314
2315 kill_anon_super(s);
2316 nfs_fscache_release_super_cookie(s);
2317 nfs_free_server(server);
2318 }
2319
2320 /*
2321 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2322 */
2323 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2324 const char *dev_name, void *raw_data,
2325 struct vfsmount *mnt)
2326 {
2327 struct nfs_clone_mount *data = raw_data;
2328 struct super_block *s;
2329 struct nfs_server *server;
2330 struct dentry *mntroot;
2331 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2332 struct nfs_sb_mountdata sb_mntdata = {
2333 .mntflags = flags,
2334 };
2335 int error;
2336
2337 dprintk("--> nfs_xdev_get_sb()\n");
2338
2339 /* create a new volume representation */
2340 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2341 if (IS_ERR(server)) {
2342 error = PTR_ERR(server);
2343 goto out_err_noserver;
2344 }
2345 sb_mntdata.server = server;
2346
2347 if (server->flags & NFS_MOUNT_UNSHARED)
2348 compare_super = NULL;
2349
2350 /* Get a superblock - note that we may end up sharing one that already exists */
2351 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2352 if (IS_ERR(s)) {
2353 error = PTR_ERR(s);
2354 goto out_err_nosb;
2355 }
2356
2357 if (s->s_fs_info != server) {
2358 nfs_free_server(server);
2359 server = NULL;
2360 } else {
2361 error = nfs_bdi_register(server);
2362 if (error)
2363 goto error_splat_bdi;
2364 }
2365
2366 if (!s->s_root) {
2367 /* initial superblock/root creation */
2368 nfs_clone_super(s, data->sb);
2369 nfs_fscache_get_super_cookie(s, NULL, data);
2370 }
2371
2372 mntroot = nfs_get_root(s, data->fh);
2373 if (IS_ERR(mntroot)) {
2374 error = PTR_ERR(mntroot);
2375 goto error_splat_super;
2376 }
2377 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2378 dput(mntroot);
2379 error = -ESTALE;
2380 goto error_splat_super;
2381 }
2382
2383 s->s_flags |= MS_ACTIVE;
2384 mnt->mnt_sb = s;
2385 mnt->mnt_root = mntroot;
2386
2387 /* clone any lsm security options from the parent to the new sb */
2388 security_sb_clone_mnt_opts(data->sb, s);
2389
2390 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2391 return 0;
2392
2393 out_err_nosb:
2394 nfs_free_server(server);
2395 out_err_noserver:
2396 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2397 return error;
2398
2399 error_splat_super:
2400 if (server && !s->s_root)
2401 bdi_unregister(&server->backing_dev_info);
2402 error_splat_bdi:
2403 deactivate_locked_super(s);
2404 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2405 return error;
2406 }
2407
2408 #ifdef CONFIG_NFS_V4
2409
2410 /*
2411 * Finish setting up a cloned NFS4 superblock
2412 */
2413 static void nfs4_clone_super(struct super_block *sb,
2414 const struct super_block *old_sb)
2415 {
2416 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2417 sb->s_blocksize = old_sb->s_blocksize;
2418 sb->s_maxbytes = old_sb->s_maxbytes;
2419 sb->s_time_gran = 1;
2420 sb->s_op = old_sb->s_op;
2421 nfs_initialise_sb(sb);
2422 }
2423
2424 /*
2425 * Set up an NFS4 superblock
2426 */
2427 static void nfs4_fill_super(struct super_block *sb)
2428 {
2429 sb->s_time_gran = 1;
2430 sb->s_op = &nfs4_sops;
2431 nfs_initialise_sb(sb);
2432 }
2433
2434 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2435 {
2436 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2437 }
2438
2439 static int nfs4_validate_text_mount_data(void *options,
2440 struct nfs_parsed_mount_data *args,
2441 const char *dev_name)
2442 {
2443 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2444
2445 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2446
2447 nfs_validate_transport_protocol(args);
2448
2449 nfs4_validate_mount_flags(args);
2450
2451 if (args->version != 4) {
2452 dfprintk(MOUNT,
2453 "NFS4: Illegal mount version\n");
2454 return -EINVAL;
2455 }
2456
2457 if (args->auth_flavor_len > 1) {
2458 dfprintk(MOUNT,
2459 "NFS4: Too many RPC auth flavours specified\n");
2460 return -EINVAL;
2461 }
2462
2463 if (args->client_address == NULL) {
2464 dfprintk(MOUNT,
2465 "NFS4: mount program didn't pass callback address\n");
2466 return -EINVAL;
2467 }
2468
2469 return nfs_parse_devname(dev_name,
2470 &args->nfs_server.hostname,
2471 NFS4_MAXNAMLEN,
2472 &args->nfs_server.export_path,
2473 NFS4_MAXPATHLEN);
2474 }
2475
2476 /*
2477 * Validate NFSv4 mount options
2478 */
2479 static int nfs4_validate_mount_data(void *options,
2480 struct nfs_parsed_mount_data *args,
2481 const char *dev_name)
2482 {
2483 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2484 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2485 char *c;
2486
2487 if (data == NULL)
2488 goto out_no_data;
2489
2490 switch (data->version) {
2491 case 1:
2492 if (data->host_addrlen > sizeof(args->nfs_server.address))
2493 goto out_no_address;
2494 if (data->host_addrlen == 0)
2495 goto out_no_address;
2496 args->nfs_server.addrlen = data->host_addrlen;
2497 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2498 return -EFAULT;
2499 if (!nfs_verify_server_address(sap))
2500 goto out_no_address;
2501
2502 if (data->auth_flavourlen) {
2503 if (data->auth_flavourlen > 1)
2504 goto out_inval_auth;
2505 if (copy_from_user(&args->auth_flavors[0],
2506 data->auth_flavours,
2507 sizeof(args->auth_flavors[0])))
2508 return -EFAULT;
2509 }
2510
2511 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2512 if (IS_ERR(c))
2513 return PTR_ERR(c);
2514 args->nfs_server.hostname = c;
2515
2516 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2517 if (IS_ERR(c))
2518 return PTR_ERR(c);
2519 args->nfs_server.export_path = c;
2520 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2521
2522 c = strndup_user(data->client_addr.data, 16);
2523 if (IS_ERR(c))
2524 return PTR_ERR(c);
2525 args->client_address = c;
2526
2527 /*
2528 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2529 * can deal with.
2530 */
2531
2532 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2533 args->rsize = data->rsize;
2534 args->wsize = data->wsize;
2535 args->timeo = data->timeo;
2536 args->retrans = data->retrans;
2537 args->acregmin = data->acregmin;
2538 args->acregmax = data->acregmax;
2539 args->acdirmin = data->acdirmin;
2540 args->acdirmax = data->acdirmax;
2541 args->nfs_server.protocol = data->proto;
2542 nfs_validate_transport_protocol(args);
2543
2544 break;
2545 default:
2546 if (nfs_parse_mount_options((char *)options, args) == 0)
2547 return -EINVAL;
2548
2549 if (!nfs_verify_server_address(sap))
2550 return -EINVAL;
2551
2552 return nfs4_validate_text_mount_data(options, args, dev_name);
2553 }
2554
2555 return 0;
2556
2557 out_no_data:
2558 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2559 return -EINVAL;
2560
2561 out_inval_auth:
2562 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2563 data->auth_flavourlen);
2564 return -EINVAL;
2565
2566 out_no_address:
2567 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2568 return -EINVAL;
2569 }
2570
2571 /*
2572 * Get the superblock for the NFS4 root partition
2573 */
2574 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2575 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2576 {
2577 struct nfs_parsed_mount_data *data = raw_data;
2578 struct super_block *s;
2579 struct nfs_server *server;
2580 struct nfs_fh *mntfh;
2581 struct dentry *mntroot;
2582 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2583 struct nfs_sb_mountdata sb_mntdata = {
2584 .mntflags = flags,
2585 };
2586 int error = -ENOMEM;
2587
2588 mntfh = nfs_alloc_fhandle();
2589 if (data == NULL || mntfh == NULL)
2590 goto out_free_fh;
2591
2592 security_init_mnt_opts(&data->lsm_opts);
2593
2594 /* Get a volume representation */
2595 server = nfs4_create_server(data, mntfh);
2596 if (IS_ERR(server)) {
2597 error = PTR_ERR(server);
2598 goto out;
2599 }
2600 sb_mntdata.server = server;
2601
2602 if (server->flags & NFS4_MOUNT_UNSHARED)
2603 compare_super = NULL;
2604
2605 /* Get a superblock - note that we may end up sharing one that already exists */
2606 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2607 if (IS_ERR(s)) {
2608 error = PTR_ERR(s);
2609 goto out_free;
2610 }
2611
2612 if (s->s_fs_info != server) {
2613 nfs_free_server(server);
2614 server = NULL;
2615 } else {
2616 error = nfs_bdi_register(server);
2617 if (error)
2618 goto error_splat_bdi;
2619 }
2620
2621 if (!s->s_root) {
2622 /* initial superblock/root creation */
2623 nfs4_fill_super(s);
2624 nfs_fscache_get_super_cookie(
2625 s, data ? data->fscache_uniq : NULL, NULL);
2626 }
2627
2628 mntroot = nfs4_get_root(s, mntfh);
2629 if (IS_ERR(mntroot)) {
2630 error = PTR_ERR(mntroot);
2631 goto error_splat_super;
2632 }
2633
2634 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2635 if (error)
2636 goto error_splat_root;
2637
2638 s->s_flags |= MS_ACTIVE;
2639 mnt->mnt_sb = s;
2640 mnt->mnt_root = mntroot;
2641 error = 0;
2642
2643 out:
2644 security_free_mnt_opts(&data->lsm_opts);
2645 out_free_fh:
2646 nfs_free_fhandle(mntfh);
2647 return error;
2648
2649 out_free:
2650 nfs_free_server(server);
2651 goto out;
2652
2653 error_splat_root:
2654 dput(mntroot);
2655 error_splat_super:
2656 if (server && !s->s_root)
2657 bdi_unregister(&server->backing_dev_info);
2658 error_splat_bdi:
2659 deactivate_locked_super(s);
2660 goto out;
2661 }
2662
2663 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2664 int flags, void *data, const char *hostname)
2665 {
2666 struct vfsmount *root_mnt;
2667 char *root_devname;
2668 size_t len;
2669
2670 len = strlen(hostname) + 3;
2671 root_devname = kmalloc(len, GFP_KERNEL);
2672 if (root_devname == NULL)
2673 return ERR_PTR(-ENOMEM);
2674 snprintf(root_devname, len, "%s:/", hostname);
2675 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2676 kfree(root_devname);
2677 return root_mnt;
2678 }
2679
2680 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2681 {
2682 char *page = (char *) __get_free_page(GFP_KERNEL);
2683 char *devname, *tmp;
2684
2685 if (page == NULL)
2686 return;
2687 devname = nfs_path(path->mnt->mnt_devname,
2688 path->mnt->mnt_root, path->dentry,
2689 page, PAGE_SIZE);
2690 if (IS_ERR(devname))
2691 goto out_freepage;
2692 tmp = kstrdup(devname, GFP_KERNEL);
2693 if (tmp == NULL)
2694 goto out_freepage;
2695 kfree(mnt->mnt_devname);
2696 mnt->mnt_devname = tmp;
2697 out_freepage:
2698 free_page((unsigned long)page);
2699 }
2700
2701 struct nfs_referral_count {
2702 struct list_head list;
2703 const struct task_struct *task;
2704 unsigned int referral_count;
2705 };
2706
2707 static LIST_HEAD(nfs_referral_count_list);
2708 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2709
2710 static struct nfs_referral_count *nfs_find_referral_count(void)
2711 {
2712 struct nfs_referral_count *p;
2713
2714 list_for_each_entry(p, &nfs_referral_count_list, list) {
2715 if (p->task == current)
2716 return p;
2717 }
2718 return NULL;
2719 }
2720
2721 #define NFS_MAX_NESTED_REFERRALS 2
2722
2723 static int nfs_referral_loop_protect(void)
2724 {
2725 struct nfs_referral_count *p, *new;
2726 int ret = -ENOMEM;
2727
2728 new = kmalloc(sizeof(*new), GFP_KERNEL);
2729 if (!new)
2730 goto out;
2731 new->task = current;
2732 new->referral_count = 1;
2733
2734 ret = 0;
2735 spin_lock(&nfs_referral_count_list_lock);
2736 p = nfs_find_referral_count();
2737 if (p != NULL) {
2738 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2739 ret = -ELOOP;
2740 else
2741 p->referral_count++;
2742 } else {
2743 list_add(&new->list, &nfs_referral_count_list);
2744 new = NULL;
2745 }
2746 spin_unlock(&nfs_referral_count_list_lock);
2747 kfree(new);
2748 out:
2749 return ret;
2750 }
2751
2752 static void nfs_referral_loop_unprotect(void)
2753 {
2754 struct nfs_referral_count *p;
2755
2756 spin_lock(&nfs_referral_count_list_lock);
2757 p = nfs_find_referral_count();
2758 p->referral_count--;
2759 if (p->referral_count == 0)
2760 list_del(&p->list);
2761 else
2762 p = NULL;
2763 spin_unlock(&nfs_referral_count_list_lock);
2764 kfree(p);
2765 }
2766
2767 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2768 const char *export_path, struct vfsmount *mnt_target)
2769 {
2770 struct nameidata *nd = NULL;
2771 struct mnt_namespace *ns_private;
2772 struct super_block *s;
2773 int ret;
2774
2775 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2776 if (nd == NULL)
2777 return -ENOMEM;
2778
2779 ns_private = create_mnt_ns(root_mnt);
2780 ret = PTR_ERR(ns_private);
2781 if (IS_ERR(ns_private))
2782 goto out_mntput;
2783
2784 ret = nfs_referral_loop_protect();
2785 if (ret != 0)
2786 goto out_put_mnt_ns;
2787
2788 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2789 export_path, LOOKUP_FOLLOW, nd);
2790
2791 nfs_referral_loop_unprotect();
2792 put_mnt_ns(ns_private);
2793
2794 if (ret != 0)
2795 goto out_err;
2796
2797 s = nd->path.mnt->mnt_sb;
2798 atomic_inc(&s->s_active);
2799 mnt_target->mnt_sb = s;
2800 mnt_target->mnt_root = dget(nd->path.dentry);
2801
2802 /* Correct the device pathname */
2803 nfs_fix_devname(&nd->path, mnt_target);
2804
2805 path_put(&nd->path);
2806 kfree(nd);
2807 down_write(&s->s_umount);
2808 return 0;
2809 out_put_mnt_ns:
2810 put_mnt_ns(ns_private);
2811 out_mntput:
2812 mntput(root_mnt);
2813 out_err:
2814 kfree(nd);
2815 return ret;
2816 }
2817
2818 static int nfs4_try_mount(int flags, const char *dev_name,
2819 struct nfs_parsed_mount_data *data,
2820 struct vfsmount *mnt)
2821 {
2822 char *export_path;
2823 struct vfsmount *root_mnt;
2824 int error;
2825
2826 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2827
2828 export_path = data->nfs_server.export_path;
2829 data->nfs_server.export_path = "/";
2830 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2831 data->nfs_server.hostname);
2832 data->nfs_server.export_path = export_path;
2833
2834 error = PTR_ERR(root_mnt);
2835 if (IS_ERR(root_mnt))
2836 goto out;
2837
2838 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2839
2840 out:
2841 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2842 error != 0 ? " [error]" : "");
2843 return error;
2844 }
2845
2846 /*
2847 * Get the superblock for an NFS4 mountpoint
2848 */
2849 static int nfs4_get_sb(struct file_system_type *fs_type,
2850 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2851 {
2852 struct nfs_parsed_mount_data *data;
2853 int error = -ENOMEM;
2854
2855 data = nfs_alloc_parsed_mount_data(4);
2856 if (data == NULL)
2857 goto out_free_data;
2858
2859 /* Validate the mount data */
2860 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2861 if (error < 0)
2862 goto out;
2863
2864 error = nfs4_try_mount(flags, dev_name, data, mnt);
2865
2866 out:
2867 kfree(data->client_address);
2868 kfree(data->nfs_server.export_path);
2869 kfree(data->nfs_server.hostname);
2870 kfree(data->fscache_uniq);
2871 out_free_data:
2872 kfree(data);
2873 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2874 error != 0 ? " [error]" : "");
2875 return error;
2876 }
2877
2878 static void nfs4_kill_super(struct super_block *sb)
2879 {
2880 struct nfs_server *server = NFS_SB(sb);
2881
2882 dprintk("--> %s\n", __func__);
2883 nfs_super_return_all_delegations(sb);
2884 kill_anon_super(sb);
2885 nfs_fscache_release_super_cookie(sb);
2886 nfs_free_server(server);
2887 dprintk("<-- %s\n", __func__);
2888 }
2889
2890 /*
2891 * Clone an NFS4 server record on xdev traversal (FSID-change)
2892 */
2893 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2894 const char *dev_name, void *raw_data,
2895 struct vfsmount *mnt)
2896 {
2897 struct nfs_clone_mount *data = raw_data;
2898 struct super_block *s;
2899 struct nfs_server *server;
2900 struct dentry *mntroot;
2901 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2902 struct nfs_sb_mountdata sb_mntdata = {
2903 .mntflags = flags,
2904 };
2905 int error;
2906
2907 dprintk("--> nfs4_xdev_get_sb()\n");
2908
2909 /* create a new volume representation */
2910 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2911 if (IS_ERR(server)) {
2912 error = PTR_ERR(server);
2913 goto out_err_noserver;
2914 }
2915 sb_mntdata.server = server;
2916
2917 if (server->flags & NFS4_MOUNT_UNSHARED)
2918 compare_super = NULL;
2919
2920 /* Get a superblock - note that we may end up sharing one that already exists */
2921 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2922 if (IS_ERR(s)) {
2923 error = PTR_ERR(s);
2924 goto out_err_nosb;
2925 }
2926
2927 if (s->s_fs_info != server) {
2928 nfs_free_server(server);
2929 server = NULL;
2930 } else {
2931 error = nfs_bdi_register(server);
2932 if (error)
2933 goto error_splat_bdi;
2934 }
2935
2936 if (!s->s_root) {
2937 /* initial superblock/root creation */
2938 nfs4_clone_super(s, data->sb);
2939 nfs_fscache_get_super_cookie(s, NULL, data);
2940 }
2941
2942 mntroot = nfs4_get_root(s, data->fh);
2943 if (IS_ERR(mntroot)) {
2944 error = PTR_ERR(mntroot);
2945 goto error_splat_super;
2946 }
2947 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2948 dput(mntroot);
2949 error = -ESTALE;
2950 goto error_splat_super;
2951 }
2952
2953 s->s_flags |= MS_ACTIVE;
2954 mnt->mnt_sb = s;
2955 mnt->mnt_root = mntroot;
2956
2957 security_sb_clone_mnt_opts(data->sb, s);
2958
2959 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2960 return 0;
2961
2962 out_err_nosb:
2963 nfs_free_server(server);
2964 out_err_noserver:
2965 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2966 return error;
2967
2968 error_splat_super:
2969 if (server && !s->s_root)
2970 bdi_unregister(&server->backing_dev_info);
2971 error_splat_bdi:
2972 deactivate_locked_super(s);
2973 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2974 return error;
2975 }
2976
2977 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2978 int flags, const char *dev_name, void *raw_data,
2979 struct vfsmount *mnt)
2980 {
2981 struct nfs_clone_mount *data = raw_data;
2982 struct super_block *s;
2983 struct nfs_server *server;
2984 struct dentry *mntroot;
2985 struct nfs_fh *mntfh;
2986 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2987 struct nfs_sb_mountdata sb_mntdata = {
2988 .mntflags = flags,
2989 };
2990 int error = -ENOMEM;
2991
2992 dprintk("--> nfs4_referral_get_sb()\n");
2993
2994 mntfh = nfs_alloc_fhandle();
2995 if (mntfh == NULL)
2996 goto out_err_nofh;
2997
2998 /* create a new volume representation */
2999 server = nfs4_create_referral_server(data, mntfh);
3000 if (IS_ERR(server)) {
3001 error = PTR_ERR(server);
3002 goto out_err_noserver;
3003 }
3004 sb_mntdata.server = server;
3005
3006 if (server->flags & NFS4_MOUNT_UNSHARED)
3007 compare_super = NULL;
3008
3009 /* Get a superblock - note that we may end up sharing one that already exists */
3010 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3011 if (IS_ERR(s)) {
3012 error = PTR_ERR(s);
3013 goto out_err_nosb;
3014 }
3015
3016 if (s->s_fs_info != server) {
3017 nfs_free_server(server);
3018 server = NULL;
3019 } else {
3020 error = nfs_bdi_register(server);
3021 if (error)
3022 goto error_splat_bdi;
3023 }
3024
3025 if (!s->s_root) {
3026 /* initial superblock/root creation */
3027 nfs4_fill_super(s);
3028 nfs_fscache_get_super_cookie(s, NULL, data);
3029 }
3030
3031 mntroot = nfs4_get_root(s, mntfh);
3032 if (IS_ERR(mntroot)) {
3033 error = PTR_ERR(mntroot);
3034 goto error_splat_super;
3035 }
3036 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3037 dput(mntroot);
3038 error = -ESTALE;
3039 goto error_splat_super;
3040 }
3041
3042 s->s_flags |= MS_ACTIVE;
3043 mnt->mnt_sb = s;
3044 mnt->mnt_root = mntroot;
3045
3046 security_sb_clone_mnt_opts(data->sb, s);
3047
3048 nfs_free_fhandle(mntfh);
3049 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3050 return 0;
3051
3052 out_err_nosb:
3053 nfs_free_server(server);
3054 out_err_noserver:
3055 nfs_free_fhandle(mntfh);
3056 out_err_nofh:
3057 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3058 return error;
3059
3060 error_splat_super:
3061 if (server && !s->s_root)
3062 bdi_unregister(&server->backing_dev_info);
3063 error_splat_bdi:
3064 deactivate_locked_super(s);
3065 nfs_free_fhandle(mntfh);
3066 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3067 return error;
3068 }
3069
3070 /*
3071 * Create an NFS4 server record on referral traversal
3072 */
3073 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3074 int flags, const char *dev_name, void *raw_data,
3075 struct vfsmount *mnt)
3076 {
3077 struct nfs_clone_mount *data = raw_data;
3078 char *export_path;
3079 struct vfsmount *root_mnt;
3080 int error;
3081
3082 dprintk("--> nfs4_referral_get_sb()\n");
3083
3084 export_path = data->mnt_path;
3085 data->mnt_path = "/";
3086
3087 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3088 flags, data, data->hostname);
3089 data->mnt_path = export_path;
3090
3091 error = PTR_ERR(root_mnt);
3092 if (IS_ERR(root_mnt))
3093 goto out;
3094
3095 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3096 out:
3097 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3098 error != 0 ? " [error]" : "");
3099 return error;
3100 }
3101
3102 #endif /* CONFIG_NFS_V4 */
kernel-based virtual machine