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Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[deliverable/linux.git] / fs / nfs / super.c
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 .clear_inode = nfs_clear_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 .clear_inode = nfs4_clear_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 switch (sap->sa_family) {
550 case AF_INET: {
551 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
552 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
553 break;
554 }
555 case AF_INET6: {
556 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
557 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
558 break;
559 }
560 default:
561 if (showdefaults)
562 seq_printf(m, ",mountaddr=unspecified");
563 }
564
565 if (nfss->mountd_version || showdefaults)
566 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
567 if (nfss->mountd_port || showdefaults)
568 seq_printf(m, ",mountport=%u", nfss->mountd_port);
569
570 nfs_show_mountd_netid(m, nfss, showdefaults);
571 }
572
573 /*
574 * Describe the mount options in force on this server representation
575 */
576 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
577 int showdefaults)
578 {
579 static const struct proc_nfs_info {
580 int flag;
581 const char *str;
582 const char *nostr;
583 } nfs_info[] = {
584 { NFS_MOUNT_SOFT, ",soft", ",hard" },
585 { NFS_MOUNT_POSIX, ",posix", "" },
586 { NFS_MOUNT_NOCTO, ",nocto", "" },
587 { NFS_MOUNT_NOAC, ",noac", "" },
588 { NFS_MOUNT_NONLM, ",nolock", "" },
589 { NFS_MOUNT_NOACL, ",noacl", "" },
590 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
591 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
592 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
593 { 0, NULL, NULL }
594 };
595 const struct proc_nfs_info *nfs_infop;
596 struct nfs_client *clp = nfss->nfs_client;
597 u32 version = clp->rpc_ops->version;
598
599 seq_printf(m, ",vers=%u", version);
600 seq_printf(m, ",rsize=%u", nfss->rsize);
601 seq_printf(m, ",wsize=%u", nfss->wsize);
602 if (nfss->bsize != 0)
603 seq_printf(m, ",bsize=%u", nfss->bsize);
604 seq_printf(m, ",namlen=%u", nfss->namelen);
605 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
606 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
607 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
608 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
609 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
610 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
611 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
612 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
613 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
614 if (nfss->flags & nfs_infop->flag)
615 seq_puts(m, nfs_infop->str);
616 else
617 seq_puts(m, nfs_infop->nostr);
618 }
619 seq_printf(m, ",proto=%s",
620 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
621 if (version == 4) {
622 if (nfss->port != NFS_PORT)
623 seq_printf(m, ",port=%u", nfss->port);
624 } else
625 if (nfss->port)
626 seq_printf(m, ",port=%u", nfss->port);
627
628 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
629 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
630 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
631
632 if (version != 4)
633 nfs_show_mountd_options(m, nfss, showdefaults);
634
635 #ifdef CONFIG_NFS_V4
636 if (clp->rpc_ops->version == 4)
637 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
638 #endif
639 if (nfss->options & NFS_OPTION_FSCACHE)
640 seq_printf(m, ",fsc");
641 }
642
643 /*
644 * Describe the mount options on this VFS mountpoint
645 */
646 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
647 {
648 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
649
650 nfs_show_mount_options(m, nfss, 0);
651
652 seq_printf(m, ",addr=%s",
653 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
654 RPC_DISPLAY_ADDR));
655
656 return 0;
657 }
658
659 /*
660 * Present statistical information for this VFS mountpoint
661 */
662 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
663 {
664 int i, cpu;
665 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
666 struct rpc_auth *auth = nfss->client->cl_auth;
667 struct nfs_iostats totals = { };
668
669 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
670
671 /*
672 * Display all mount option settings
673 */
674 seq_printf(m, "\n\topts:\t");
675 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
676 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
677 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
678 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
679 nfs_show_mount_options(m, nfss, 1);
680
681 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
682
683 seq_printf(m, "\n\tcaps:\t");
684 seq_printf(m, "caps=0x%x", nfss->caps);
685 seq_printf(m, ",wtmult=%u", nfss->wtmult);
686 seq_printf(m, ",dtsize=%u", nfss->dtsize);
687 seq_printf(m, ",bsize=%u", nfss->bsize);
688 seq_printf(m, ",namlen=%u", nfss->namelen);
689
690 #ifdef CONFIG_NFS_V4
691 if (nfss->nfs_client->rpc_ops->version == 4) {
692 seq_printf(m, "\n\tnfsv4:\t");
693 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
694 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
695 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
696 }
697 #endif
698
699 /*
700 * Display security flavor in effect for this mount
701 */
702 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
703 if (auth->au_flavor)
704 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
705
706 /*
707 * Display superblock I/O counters
708 */
709 for_each_possible_cpu(cpu) {
710 struct nfs_iostats *stats;
711
712 preempt_disable();
713 stats = per_cpu_ptr(nfss->io_stats, cpu);
714
715 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
716 totals.events[i] += stats->events[i];
717 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
718 totals.bytes[i] += stats->bytes[i];
719 #ifdef CONFIG_NFS_FSCACHE
720 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
721 totals.fscache[i] += stats->fscache[i];
722 #endif
723
724 preempt_enable();
725 }
726
727 seq_printf(m, "\n\tevents:\t");
728 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
729 seq_printf(m, "%lu ", totals.events[i]);
730 seq_printf(m, "\n\tbytes:\t");
731 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
732 seq_printf(m, "%Lu ", totals.bytes[i]);
733 #ifdef CONFIG_NFS_FSCACHE
734 if (nfss->options & NFS_OPTION_FSCACHE) {
735 seq_printf(m, "\n\tfsc:\t");
736 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
737 seq_printf(m, "%Lu ", totals.bytes[i]);
738 }
739 #endif
740 seq_printf(m, "\n");
741
742 rpc_print_iostats(m, nfss->client);
743
744 return 0;
745 }
746
747 /*
748 * Begin unmount by attempting to remove all automounted mountpoints we added
749 * in response to xdev traversals and referrals
750 */
751 static void nfs_umount_begin(struct super_block *sb)
752 {
753 struct nfs_server *server;
754 struct rpc_clnt *rpc;
755
756 server = NFS_SB(sb);
757 /* -EIO all pending I/O */
758 rpc = server->client_acl;
759 if (!IS_ERR(rpc))
760 rpc_killall_tasks(rpc);
761 rpc = server->client;
762 if (!IS_ERR(rpc))
763 rpc_killall_tasks(rpc);
764 }
765
766 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
767 {
768 struct nfs_parsed_mount_data *data;
769
770 data = kzalloc(sizeof(*data), GFP_KERNEL);
771 if (data) {
772 data->acregmin = NFS_DEF_ACREGMIN;
773 data->acregmax = NFS_DEF_ACREGMAX;
774 data->acdirmin = NFS_DEF_ACDIRMIN;
775 data->acdirmax = NFS_DEF_ACDIRMAX;
776 data->mount_server.port = NFS_UNSPEC_PORT;
777 data->nfs_server.port = NFS_UNSPEC_PORT;
778 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
779 data->auth_flavors[0] = RPC_AUTH_UNIX;
780 data->auth_flavor_len = 1;
781 data->version = version;
782 data->minorversion = 0;
783 }
784 return data;
785 }
786
787 /*
788 * Sanity-check a server address provided by the mount command.
789 *
790 * Address family must be initialized, and address must not be
791 * the ANY address for that family.
792 */
793 static int nfs_verify_server_address(struct sockaddr *addr)
794 {
795 switch (addr->sa_family) {
796 case AF_INET: {
797 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
798 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
799 }
800 case AF_INET6: {
801 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
802 return !ipv6_addr_any(sa);
803 }
804 }
805
806 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
807 return 0;
808 }
809
810 /*
811 * Select between a default port value and a user-specified port value.
812 * If a zero value is set, then autobind will be used.
813 */
814 static void nfs_set_port(struct sockaddr *sap, int *port,
815 const unsigned short default_port)
816 {
817 if (*port == NFS_UNSPEC_PORT)
818 *port = default_port;
819
820 rpc_set_port(sap, *port);
821 }
822
823 /*
824 * Sanity check the NFS transport protocol.
825 *
826 */
827 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
828 {
829 switch (mnt->nfs_server.protocol) {
830 case XPRT_TRANSPORT_UDP:
831 case XPRT_TRANSPORT_TCP:
832 case XPRT_TRANSPORT_RDMA:
833 break;
834 default:
835 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
836 }
837 }
838
839 /*
840 * For text based NFSv2/v3 mounts, the mount protocol transport default
841 * settings should depend upon the specified NFS transport.
842 */
843 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
844 {
845 nfs_validate_transport_protocol(mnt);
846
847 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
848 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
849 return;
850 switch (mnt->nfs_server.protocol) {
851 case XPRT_TRANSPORT_UDP:
852 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
853 break;
854 case XPRT_TRANSPORT_TCP:
855 case XPRT_TRANSPORT_RDMA:
856 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
857 }
858 }
859
860 /*
861 * Parse the value of the 'sec=' option.
862 */
863 static int nfs_parse_security_flavors(char *value,
864 struct nfs_parsed_mount_data *mnt)
865 {
866 substring_t args[MAX_OPT_ARGS];
867
868 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
869
870 switch (match_token(value, nfs_secflavor_tokens, args)) {
871 case Opt_sec_none:
872 mnt->auth_flavors[0] = RPC_AUTH_NULL;
873 break;
874 case Opt_sec_sys:
875 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
876 break;
877 case Opt_sec_krb5:
878 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
879 break;
880 case Opt_sec_krb5i:
881 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
882 break;
883 case Opt_sec_krb5p:
884 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
885 break;
886 case Opt_sec_lkey:
887 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
888 break;
889 case Opt_sec_lkeyi:
890 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
891 break;
892 case Opt_sec_lkeyp:
893 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
894 break;
895 case Opt_sec_spkm:
896 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
897 break;
898 case Opt_sec_spkmi:
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
900 break;
901 case Opt_sec_spkmp:
902 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
903 break;
904 default:
905 return 0;
906 }
907
908 mnt->auth_flavor_len = 1;
909 return 1;
910 }
911
912 /*
913 * Error-check and convert a string of mount options from user space into
914 * a data structure. The whole mount string is processed; bad options are
915 * skipped as they are encountered. If there were no errors, return 1;
916 * otherwise return 0 (zero).
917 */
918 static int nfs_parse_mount_options(char *raw,
919 struct nfs_parsed_mount_data *mnt)
920 {
921 char *p, *string, *secdata;
922 int rc, sloppy = 0, invalid_option = 0;
923 unsigned short protofamily = AF_UNSPEC;
924 unsigned short mountfamily = AF_UNSPEC;
925
926 if (!raw) {
927 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
928 return 1;
929 }
930 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
931
932 secdata = alloc_secdata();
933 if (!secdata)
934 goto out_nomem;
935
936 rc = security_sb_copy_data(raw, secdata);
937 if (rc)
938 goto out_security_failure;
939
940 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
941 if (rc)
942 goto out_security_failure;
943
944 free_secdata(secdata);
945
946 while ((p = strsep(&raw, ",")) != NULL) {
947 substring_t args[MAX_OPT_ARGS];
948 unsigned long option;
949 int token;
950
951 if (!*p)
952 continue;
953
954 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
955
956 token = match_token(p, nfs_mount_option_tokens, args);
957 switch (token) {
958
959 /*
960 * boolean options: foo/nofoo
961 */
962 case Opt_soft:
963 mnt->flags |= NFS_MOUNT_SOFT;
964 break;
965 case Opt_hard:
966 mnt->flags &= ~NFS_MOUNT_SOFT;
967 break;
968 case Opt_posix:
969 mnt->flags |= NFS_MOUNT_POSIX;
970 break;
971 case Opt_noposix:
972 mnt->flags &= ~NFS_MOUNT_POSIX;
973 break;
974 case Opt_cto:
975 mnt->flags &= ~NFS_MOUNT_NOCTO;
976 break;
977 case Opt_nocto:
978 mnt->flags |= NFS_MOUNT_NOCTO;
979 break;
980 case Opt_ac:
981 mnt->flags &= ~NFS_MOUNT_NOAC;
982 break;
983 case Opt_noac:
984 mnt->flags |= NFS_MOUNT_NOAC;
985 break;
986 case Opt_lock:
987 mnt->flags &= ~NFS_MOUNT_NONLM;
988 break;
989 case Opt_nolock:
990 mnt->flags |= NFS_MOUNT_NONLM;
991 break;
992 case Opt_v2:
993 mnt->flags &= ~NFS_MOUNT_VER3;
994 mnt->version = 2;
995 break;
996 case Opt_v3:
997 mnt->flags |= NFS_MOUNT_VER3;
998 mnt->version = 3;
999 break;
1000 #ifdef CONFIG_NFS_V4
1001 case Opt_v4:
1002 mnt->flags &= ~NFS_MOUNT_VER3;
1003 mnt->version = 4;
1004 break;
1005 #endif
1006 case Opt_udp:
1007 mnt->flags &= ~NFS_MOUNT_TCP;
1008 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1009 break;
1010 case Opt_tcp:
1011 mnt->flags |= NFS_MOUNT_TCP;
1012 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1013 break;
1014 case Opt_rdma:
1015 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1016 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1017 xprt_load_transport(p);
1018 break;
1019 case Opt_acl:
1020 mnt->flags &= ~NFS_MOUNT_NOACL;
1021 break;
1022 case Opt_noacl:
1023 mnt->flags |= NFS_MOUNT_NOACL;
1024 break;
1025 case Opt_rdirplus:
1026 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1027 break;
1028 case Opt_nordirplus:
1029 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1030 break;
1031 case Opt_sharecache:
1032 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1033 break;
1034 case Opt_nosharecache:
1035 mnt->flags |= NFS_MOUNT_UNSHARED;
1036 break;
1037 case Opt_resvport:
1038 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1039 break;
1040 case Opt_noresvport:
1041 mnt->flags |= NFS_MOUNT_NORESVPORT;
1042 break;
1043 case Opt_fscache:
1044 mnt->options |= NFS_OPTION_FSCACHE;
1045 kfree(mnt->fscache_uniq);
1046 mnt->fscache_uniq = NULL;
1047 break;
1048 case Opt_nofscache:
1049 mnt->options &= ~NFS_OPTION_FSCACHE;
1050 kfree(mnt->fscache_uniq);
1051 mnt->fscache_uniq = NULL;
1052 break;
1053
1054 /*
1055 * options that take numeric values
1056 */
1057 case Opt_port:
1058 string = match_strdup(args);
1059 if (string == NULL)
1060 goto out_nomem;
1061 rc = strict_strtoul(string, 10, &option);
1062 kfree(string);
1063 if (rc != 0 || option > USHRT_MAX)
1064 goto out_invalid_value;
1065 mnt->nfs_server.port = option;
1066 break;
1067 case Opt_rsize:
1068 string = match_strdup(args);
1069 if (string == NULL)
1070 goto out_nomem;
1071 rc = strict_strtoul(string, 10, &option);
1072 kfree(string);
1073 if (rc != 0)
1074 goto out_invalid_value;
1075 mnt->rsize = option;
1076 break;
1077 case Opt_wsize:
1078 string = match_strdup(args);
1079 if (string == NULL)
1080 goto out_nomem;
1081 rc = strict_strtoul(string, 10, &option);
1082 kfree(string);
1083 if (rc != 0)
1084 goto out_invalid_value;
1085 mnt->wsize = option;
1086 break;
1087 case Opt_bsize:
1088 string = match_strdup(args);
1089 if (string == NULL)
1090 goto out_nomem;
1091 rc = strict_strtoul(string, 10, &option);
1092 kfree(string);
1093 if (rc != 0)
1094 goto out_invalid_value;
1095 mnt->bsize = option;
1096 break;
1097 case Opt_timeo:
1098 string = match_strdup(args);
1099 if (string == NULL)
1100 goto out_nomem;
1101 rc = strict_strtoul(string, 10, &option);
1102 kfree(string);
1103 if (rc != 0 || option == 0)
1104 goto out_invalid_value;
1105 mnt->timeo = option;
1106 break;
1107 case Opt_retrans:
1108 string = match_strdup(args);
1109 if (string == NULL)
1110 goto out_nomem;
1111 rc = strict_strtoul(string, 10, &option);
1112 kfree(string);
1113 if (rc != 0 || option == 0)
1114 goto out_invalid_value;
1115 mnt->retrans = option;
1116 break;
1117 case Opt_acregmin:
1118 string = match_strdup(args);
1119 if (string == NULL)
1120 goto out_nomem;
1121 rc = strict_strtoul(string, 10, &option);
1122 kfree(string);
1123 if (rc != 0)
1124 goto out_invalid_value;
1125 mnt->acregmin = option;
1126 break;
1127 case Opt_acregmax:
1128 string = match_strdup(args);
1129 if (string == NULL)
1130 goto out_nomem;
1131 rc = strict_strtoul(string, 10, &option);
1132 kfree(string);
1133 if (rc != 0)
1134 goto out_invalid_value;
1135 mnt->acregmax = option;
1136 break;
1137 case Opt_acdirmin:
1138 string = match_strdup(args);
1139 if (string == NULL)
1140 goto out_nomem;
1141 rc = strict_strtoul(string, 10, &option);
1142 kfree(string);
1143 if (rc != 0)
1144 goto out_invalid_value;
1145 mnt->acdirmin = option;
1146 break;
1147 case Opt_acdirmax:
1148 string = match_strdup(args);
1149 if (string == NULL)
1150 goto out_nomem;
1151 rc = strict_strtoul(string, 10, &option);
1152 kfree(string);
1153 if (rc != 0)
1154 goto out_invalid_value;
1155 mnt->acdirmax = option;
1156 break;
1157 case Opt_actimeo:
1158 string = match_strdup(args);
1159 if (string == NULL)
1160 goto out_nomem;
1161 rc = strict_strtoul(string, 10, &option);
1162 kfree(string);
1163 if (rc != 0)
1164 goto out_invalid_value;
1165 mnt->acregmin = mnt->acregmax =
1166 mnt->acdirmin = mnt->acdirmax = option;
1167 break;
1168 case Opt_namelen:
1169 string = match_strdup(args);
1170 if (string == NULL)
1171 goto out_nomem;
1172 rc = strict_strtoul(string, 10, &option);
1173 kfree(string);
1174 if (rc != 0)
1175 goto out_invalid_value;
1176 mnt->namlen = option;
1177 break;
1178 case Opt_mountport:
1179 string = match_strdup(args);
1180 if (string == NULL)
1181 goto out_nomem;
1182 rc = strict_strtoul(string, 10, &option);
1183 kfree(string);
1184 if (rc != 0 || option > USHRT_MAX)
1185 goto out_invalid_value;
1186 mnt->mount_server.port = option;
1187 break;
1188 case Opt_mountvers:
1189 string = match_strdup(args);
1190 if (string == NULL)
1191 goto out_nomem;
1192 rc = strict_strtoul(string, 10, &option);
1193 kfree(string);
1194 if (rc != 0 ||
1195 option < NFS_MNT_VERSION ||
1196 option > NFS_MNT3_VERSION)
1197 goto out_invalid_value;
1198 mnt->mount_server.version = option;
1199 break;
1200 case Opt_nfsvers:
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 switch (option) {
1209 case NFS2_VERSION:
1210 mnt->flags &= ~NFS_MOUNT_VER3;
1211 mnt->version = 2;
1212 break;
1213 case NFS3_VERSION:
1214 mnt->flags |= NFS_MOUNT_VER3;
1215 mnt->version = 3;
1216 break;
1217 #ifdef CONFIG_NFS_V4
1218 case NFS4_VERSION:
1219 mnt->flags &= ~NFS_MOUNT_VER3;
1220 mnt->version = 4;
1221 break;
1222 #endif
1223 default:
1224 goto out_invalid_value;
1225 }
1226 break;
1227 case Opt_minorversion:
1228 string = match_strdup(args);
1229 if (string == NULL)
1230 goto out_nomem;
1231 rc = strict_strtoul(string, 10, &option);
1232 kfree(string);
1233 if (rc != 0)
1234 goto out_invalid_value;
1235 if (option > NFS4_MAX_MINOR_VERSION)
1236 goto out_invalid_value;
1237 mnt->minorversion = option;
1238 break;
1239
1240 /*
1241 * options that take text values
1242 */
1243 case Opt_sec:
1244 string = match_strdup(args);
1245 if (string == NULL)
1246 goto out_nomem;
1247 rc = nfs_parse_security_flavors(string, mnt);
1248 kfree(string);
1249 if (!rc) {
1250 dfprintk(MOUNT, "NFS: unrecognized "
1251 "security flavor\n");
1252 return 0;
1253 }
1254 break;
1255 case Opt_proto:
1256 string = match_strdup(args);
1257 if (string == NULL)
1258 goto out_nomem;
1259 token = match_token(string,
1260 nfs_xprt_protocol_tokens, args);
1261
1262 protofamily = AF_INET;
1263 switch (token) {
1264 case Opt_xprt_udp6:
1265 protofamily = AF_INET6;
1266 case Opt_xprt_udp:
1267 mnt->flags &= ~NFS_MOUNT_TCP;
1268 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1269 kfree(string);
1270 break;
1271 case Opt_xprt_tcp6:
1272 protofamily = AF_INET6;
1273 case Opt_xprt_tcp:
1274 mnt->flags |= NFS_MOUNT_TCP;
1275 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1276 kfree(string);
1277 break;
1278 case Opt_xprt_rdma:
1279 /* vector side protocols to TCP */
1280 mnt->flags |= NFS_MOUNT_TCP;
1281 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1282 xprt_load_transport(string);
1283 kfree(string);
1284 break;
1285 default:
1286 dfprintk(MOUNT, "NFS: unrecognized "
1287 "transport protocol\n");
1288 kfree(string);
1289 return 0;
1290 }
1291 break;
1292 case Opt_mountproto:
1293 string = match_strdup(args);
1294 if (string == NULL)
1295 goto out_nomem;
1296 token = match_token(string,
1297 nfs_xprt_protocol_tokens, args);
1298 kfree(string);
1299
1300 mountfamily = AF_INET;
1301 switch (token) {
1302 case Opt_xprt_udp6:
1303 mountfamily = AF_INET6;
1304 case Opt_xprt_udp:
1305 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1306 break;
1307 case Opt_xprt_tcp6:
1308 mountfamily = AF_INET6;
1309 case Opt_xprt_tcp:
1310 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1311 break;
1312 case Opt_xprt_rdma: /* not used for side protocols */
1313 default:
1314 dfprintk(MOUNT, "NFS: unrecognized "
1315 "transport protocol\n");
1316 return 0;
1317 }
1318 break;
1319 case Opt_addr:
1320 string = match_strdup(args);
1321 if (string == NULL)
1322 goto out_nomem;
1323 mnt->nfs_server.addrlen =
1324 rpc_pton(string, strlen(string),
1325 (struct sockaddr *)
1326 &mnt->nfs_server.address,
1327 sizeof(mnt->nfs_server.address));
1328 kfree(string);
1329 if (mnt->nfs_server.addrlen == 0)
1330 goto out_invalid_address;
1331 break;
1332 case Opt_clientaddr:
1333 string = match_strdup(args);
1334 if (string == NULL)
1335 goto out_nomem;
1336 kfree(mnt->client_address);
1337 mnt->client_address = string;
1338 break;
1339 case Opt_mounthost:
1340 string = match_strdup(args);
1341 if (string == NULL)
1342 goto out_nomem;
1343 kfree(mnt->mount_server.hostname);
1344 mnt->mount_server.hostname = string;
1345 break;
1346 case Opt_mountaddr:
1347 string = match_strdup(args);
1348 if (string == NULL)
1349 goto out_nomem;
1350 mnt->mount_server.addrlen =
1351 rpc_pton(string, strlen(string),
1352 (struct sockaddr *)
1353 &mnt->mount_server.address,
1354 sizeof(mnt->mount_server.address));
1355 kfree(string);
1356 if (mnt->mount_server.addrlen == 0)
1357 goto out_invalid_address;
1358 break;
1359 case Opt_lookupcache:
1360 string = match_strdup(args);
1361 if (string == NULL)
1362 goto out_nomem;
1363 token = match_token(string,
1364 nfs_lookupcache_tokens, args);
1365 kfree(string);
1366 switch (token) {
1367 case Opt_lookupcache_all:
1368 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1369 break;
1370 case Opt_lookupcache_positive:
1371 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1372 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1373 break;
1374 case Opt_lookupcache_none:
1375 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1376 break;
1377 default:
1378 dfprintk(MOUNT, "NFS: invalid "
1379 "lookupcache argument\n");
1380 return 0;
1381 };
1382 break;
1383 case Opt_fscache_uniq:
1384 string = match_strdup(args);
1385 if (string == NULL)
1386 goto out_nomem;
1387 kfree(mnt->fscache_uniq);
1388 mnt->fscache_uniq = string;
1389 mnt->options |= NFS_OPTION_FSCACHE;
1390 break;
1391
1392 /*
1393 * Special options
1394 */
1395 case Opt_sloppy:
1396 sloppy = 1;
1397 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1398 break;
1399 case Opt_userspace:
1400 case Opt_deprecated:
1401 dfprintk(MOUNT, "NFS: ignoring mount option "
1402 "'%s'\n", p);
1403 break;
1404
1405 default:
1406 invalid_option = 1;
1407 dfprintk(MOUNT, "NFS: unrecognized mount option "
1408 "'%s'\n", p);
1409 }
1410 }
1411
1412 if (!sloppy && invalid_option)
1413 return 0;
1414
1415 /*
1416 * verify that any proto=/mountproto= options match the address
1417 * familiies in the addr=/mountaddr= options.
1418 */
1419 if (protofamily != AF_UNSPEC &&
1420 protofamily != mnt->nfs_server.address.ss_family)
1421 goto out_proto_mismatch;
1422
1423 if (mountfamily != AF_UNSPEC) {
1424 if (mnt->mount_server.addrlen) {
1425 if (mountfamily != mnt->mount_server.address.ss_family)
1426 goto out_mountproto_mismatch;
1427 } else {
1428 if (mountfamily != mnt->nfs_server.address.ss_family)
1429 goto out_mountproto_mismatch;
1430 }
1431 }
1432
1433 return 1;
1434
1435 out_mountproto_mismatch:
1436 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1437 "option\n");
1438 return 0;
1439 out_proto_mismatch:
1440 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1441 return 0;
1442 out_invalid_address:
1443 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1444 return 0;
1445 out_invalid_value:
1446 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1447 return 0;
1448 out_nomem:
1449 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1450 return 0;
1451 out_security_failure:
1452 free_secdata(secdata);
1453 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1454 return 0;
1455 }
1456
1457 /*
1458 * Match the requested auth flavors with the list returned by
1459 * the server. Returns zero and sets the mount's authentication
1460 * flavor on success; returns -EACCES if server does not support
1461 * the requested flavor.
1462 */
1463 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1464 struct nfs_mount_request *request)
1465 {
1466 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1467
1468 /*
1469 * Certain releases of Linux's mountd return an empty
1470 * flavor list. To prevent behavioral regression with
1471 * these servers (ie. rejecting mounts that used to
1472 * succeed), revert to pre-2.6.32 behavior (no checking)
1473 * if the returned flavor list is empty.
1474 */
1475 if (server_authlist_len == 0)
1476 return 0;
1477
1478 /*
1479 * We avoid sophisticated negotiating here, as there are
1480 * plenty of cases where we can get it wrong, providing
1481 * either too little or too much security.
1482 *
1483 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1484 * flavor listed first. However, some servers list
1485 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1486 * preferred default, in args->auth_flavors[0] if user
1487 * didn't specify sec= mount option.
1488 */
1489 for (i = 0; i < args->auth_flavor_len; i++)
1490 for (j = 0; j < server_authlist_len; j++)
1491 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1492 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1493 request->auth_flavs[j]);
1494 args->auth_flavors[0] = request->auth_flavs[j];
1495 return 0;
1496 }
1497
1498 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1499 nfs_umount(request);
1500 return -EACCES;
1501 }
1502
1503 /*
1504 * Use the remote server's MOUNT service to request the NFS file handle
1505 * corresponding to the provided path.
1506 */
1507 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1508 struct nfs_fh *root_fh)
1509 {
1510 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1511 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1512 struct nfs_mount_request request = {
1513 .sap = (struct sockaddr *)
1514 &args->mount_server.address,
1515 .dirpath = args->nfs_server.export_path,
1516 .protocol = args->mount_server.protocol,
1517 .fh = root_fh,
1518 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1519 .auth_flav_len = &server_authlist_len,
1520 .auth_flavs = server_authlist,
1521 };
1522 int status;
1523
1524 if (args->mount_server.version == 0) {
1525 switch (args->version) {
1526 default:
1527 args->mount_server.version = NFS_MNT3_VERSION;
1528 break;
1529 case 2:
1530 args->mount_server.version = NFS_MNT_VERSION;
1531 }
1532 }
1533 request.version = args->mount_server.version;
1534
1535 if (args->mount_server.hostname)
1536 request.hostname = args->mount_server.hostname;
1537 else
1538 request.hostname = args->nfs_server.hostname;
1539
1540 /*
1541 * Construct the mount server's address.
1542 */
1543 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1544 memcpy(request.sap, &args->nfs_server.address,
1545 args->nfs_server.addrlen);
1546 args->mount_server.addrlen = args->nfs_server.addrlen;
1547 }
1548 request.salen = args->mount_server.addrlen;
1549 nfs_set_port(request.sap, &args->mount_server.port, 0);
1550
1551 /*
1552 * Now ask the mount server to map our export path
1553 * to a file handle.
1554 */
1555 status = nfs_mount(&request);
1556 if (status != 0) {
1557 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1558 request.hostname, status);
1559 return status;
1560 }
1561
1562 /*
1563 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1564 */
1565 if (args->mount_server.version != NFS_MNT3_VERSION)
1566 return 0;
1567 return nfs_walk_authlist(args, &request);
1568 }
1569
1570 static int nfs_parse_simple_hostname(const char *dev_name,
1571 char **hostname, size_t maxnamlen,
1572 char **export_path, size_t maxpathlen)
1573 {
1574 size_t len;
1575 char *colon, *comma;
1576
1577 colon = strchr(dev_name, ':');
1578 if (colon == NULL)
1579 goto out_bad_devname;
1580
1581 len = colon - dev_name;
1582 if (len > maxnamlen)
1583 goto out_hostname;
1584
1585 /* N.B. caller will free nfs_server.hostname in all cases */
1586 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1587 if (!*hostname)
1588 goto out_nomem;
1589
1590 /* kill possible hostname list: not supported */
1591 comma = strchr(*hostname, ',');
1592 if (comma != NULL) {
1593 if (comma == *hostname)
1594 goto out_bad_devname;
1595 *comma = '\0';
1596 }
1597
1598 colon++;
1599 len = strlen(colon);
1600 if (len > maxpathlen)
1601 goto out_path;
1602 *export_path = kstrndup(colon, len, GFP_KERNEL);
1603 if (!*export_path)
1604 goto out_nomem;
1605
1606 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1607 return 0;
1608
1609 out_bad_devname:
1610 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1611 return -EINVAL;
1612
1613 out_nomem:
1614 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1615 return -ENOMEM;
1616
1617 out_hostname:
1618 dfprintk(MOUNT, "NFS: server hostname too long\n");
1619 return -ENAMETOOLONG;
1620
1621 out_path:
1622 dfprintk(MOUNT, "NFS: export pathname too long\n");
1623 return -ENAMETOOLONG;
1624 }
1625
1626 /*
1627 * Hostname has square brackets around it because it contains one or
1628 * more colons. We look for the first closing square bracket, and a
1629 * colon must follow it.
1630 */
1631 static int nfs_parse_protected_hostname(const char *dev_name,
1632 char **hostname, size_t maxnamlen,
1633 char **export_path, size_t maxpathlen)
1634 {
1635 size_t len;
1636 char *start, *end;
1637
1638 start = (char *)(dev_name + 1);
1639
1640 end = strchr(start, ']');
1641 if (end == NULL)
1642 goto out_bad_devname;
1643 if (*(end + 1) != ':')
1644 goto out_bad_devname;
1645
1646 len = end - start;
1647 if (len > maxnamlen)
1648 goto out_hostname;
1649
1650 /* N.B. caller will free nfs_server.hostname in all cases */
1651 *hostname = kstrndup(start, len, GFP_KERNEL);
1652 if (*hostname == NULL)
1653 goto out_nomem;
1654
1655 end += 2;
1656 len = strlen(end);
1657 if (len > maxpathlen)
1658 goto out_path;
1659 *export_path = kstrndup(end, len, GFP_KERNEL);
1660 if (!*export_path)
1661 goto out_nomem;
1662
1663 return 0;
1664
1665 out_bad_devname:
1666 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1667 return -EINVAL;
1668
1669 out_nomem:
1670 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1671 return -ENOMEM;
1672
1673 out_hostname:
1674 dfprintk(MOUNT, "NFS: server hostname too long\n");
1675 return -ENAMETOOLONG;
1676
1677 out_path:
1678 dfprintk(MOUNT, "NFS: export pathname too long\n");
1679 return -ENAMETOOLONG;
1680 }
1681
1682 /*
1683 * Split "dev_name" into "hostname:export_path".
1684 *
1685 * The leftmost colon demarks the split between the server's hostname
1686 * and the export path. If the hostname starts with a left square
1687 * bracket, then it may contain colons.
1688 *
1689 * Note: caller frees hostname and export path, even on error.
1690 */
1691 static int nfs_parse_devname(const char *dev_name,
1692 char **hostname, size_t maxnamlen,
1693 char **export_path, size_t maxpathlen)
1694 {
1695 if (*dev_name == '[')
1696 return nfs_parse_protected_hostname(dev_name,
1697 hostname, maxnamlen,
1698 export_path, maxpathlen);
1699
1700 return nfs_parse_simple_hostname(dev_name,
1701 hostname, maxnamlen,
1702 export_path, maxpathlen);
1703 }
1704
1705 /*
1706 * Validate the NFS2/NFS3 mount data
1707 * - fills in the mount root filehandle
1708 *
1709 * For option strings, user space handles the following behaviors:
1710 *
1711 * + DNS: mapping server host name to IP address ("addr=" option)
1712 *
1713 * + failure mode: how to behave if a mount request can't be handled
1714 * immediately ("fg/bg" option)
1715 *
1716 * + retry: how often to retry a mount request ("retry=" option)
1717 *
1718 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1719 * mountproto=tcp after mountproto=udp, and so on
1720 */
1721 static int nfs_validate_mount_data(void *options,
1722 struct nfs_parsed_mount_data *args,
1723 struct nfs_fh *mntfh,
1724 const char *dev_name)
1725 {
1726 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1727 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1728
1729 if (data == NULL)
1730 goto out_no_data;
1731
1732 switch (data->version) {
1733 case 1:
1734 data->namlen = 0;
1735 case 2:
1736 data->bsize = 0;
1737 case 3:
1738 if (data->flags & NFS_MOUNT_VER3)
1739 goto out_no_v3;
1740 data->root.size = NFS2_FHSIZE;
1741 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1742 case 4:
1743 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1744 goto out_no_sec;
1745 case 5:
1746 memset(data->context, 0, sizeof(data->context));
1747 case 6:
1748 if (data->flags & NFS_MOUNT_VER3) {
1749 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1750 goto out_invalid_fh;
1751 mntfh->size = data->root.size;
1752 args->version = 3;
1753 } else {
1754 mntfh->size = NFS2_FHSIZE;
1755 args->version = 2;
1756 }
1757
1758
1759 memcpy(mntfh->data, data->root.data, mntfh->size);
1760 if (mntfh->size < sizeof(mntfh->data))
1761 memset(mntfh->data + mntfh->size, 0,
1762 sizeof(mntfh->data) - mntfh->size);
1763
1764 /*
1765 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1766 * can deal with.
1767 */
1768 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1769 args->rsize = data->rsize;
1770 args->wsize = data->wsize;
1771 args->timeo = data->timeo;
1772 args->retrans = data->retrans;
1773 args->acregmin = data->acregmin;
1774 args->acregmax = data->acregmax;
1775 args->acdirmin = data->acdirmin;
1776 args->acdirmax = data->acdirmax;
1777
1778 memcpy(sap, &data->addr, sizeof(data->addr));
1779 args->nfs_server.addrlen = sizeof(data->addr);
1780 if (!nfs_verify_server_address(sap))
1781 goto out_no_address;
1782
1783 if (!(data->flags & NFS_MOUNT_TCP))
1784 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1785 /* N.B. caller will free nfs_server.hostname in all cases */
1786 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1787 args->namlen = data->namlen;
1788 args->bsize = data->bsize;
1789
1790 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1791 args->auth_flavors[0] = data->pseudoflavor;
1792 if (!args->nfs_server.hostname)
1793 goto out_nomem;
1794
1795 /*
1796 * The legacy version 6 binary mount data from userspace has a
1797 * field used only to transport selinux information into the
1798 * the kernel. To continue to support that functionality we
1799 * have a touch of selinux knowledge here in the NFS code. The
1800 * userspace code converted context=blah to just blah so we are
1801 * converting back to the full string selinux understands.
1802 */
1803 if (data->context[0]){
1804 #ifdef CONFIG_SECURITY_SELINUX
1805 int rc;
1806 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1807 if (!opts_str)
1808 return -ENOMEM;
1809 strcpy(opts_str, "context=");
1810 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1811 strcat(opts_str, &data->context[0]);
1812 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1813 kfree(opts_str);
1814 if (rc)
1815 return rc;
1816 #else
1817 return -EINVAL;
1818 #endif
1819 }
1820
1821 break;
1822 default: {
1823 int status;
1824
1825 if (nfs_parse_mount_options((char *)options, args) == 0)
1826 return -EINVAL;
1827
1828 if (!nfs_verify_server_address(sap))
1829 goto out_no_address;
1830
1831 if (args->version == 4)
1832 #ifdef CONFIG_NFS_V4
1833 return nfs4_validate_text_mount_data(options,
1834 args, dev_name);
1835 #else
1836 goto out_v4_not_compiled;
1837 #endif
1838
1839 nfs_set_port(sap, &args->nfs_server.port, 0);
1840
1841 nfs_set_mount_transport_protocol(args);
1842
1843 status = nfs_parse_devname(dev_name,
1844 &args->nfs_server.hostname,
1845 PAGE_SIZE,
1846 &args->nfs_server.export_path,
1847 NFS_MAXPATHLEN);
1848 if (!status)
1849 status = nfs_try_mount(args, mntfh);
1850
1851 kfree(args->nfs_server.export_path);
1852 args->nfs_server.export_path = NULL;
1853
1854 if (status)
1855 return status;
1856
1857 break;
1858 }
1859 }
1860
1861 #ifndef CONFIG_NFS_V3
1862 if (args->version == 3)
1863 goto out_v3_not_compiled;
1864 #endif /* !CONFIG_NFS_V3 */
1865
1866 return 0;
1867
1868 out_no_data:
1869 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1870 return -EINVAL;
1871
1872 out_no_v3:
1873 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1874 data->version);
1875 return -EINVAL;
1876
1877 out_no_sec:
1878 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1879 return -EINVAL;
1880
1881 #ifndef CONFIG_NFS_V3
1882 out_v3_not_compiled:
1883 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1884 return -EPROTONOSUPPORT;
1885 #endif /* !CONFIG_NFS_V3 */
1886
1887 #ifndef CONFIG_NFS_V4
1888 out_v4_not_compiled:
1889 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1890 return -EPROTONOSUPPORT;
1891 #endif /* !CONFIG_NFS_V4 */
1892
1893 out_nomem:
1894 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1895 return -ENOMEM;
1896
1897 out_no_address:
1898 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1899 return -EINVAL;
1900
1901 out_invalid_fh:
1902 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1903 return -EINVAL;
1904 }
1905
1906 static int
1907 nfs_compare_remount_data(struct nfs_server *nfss,
1908 struct nfs_parsed_mount_data *data)
1909 {
1910 if (data->flags != nfss->flags ||
1911 data->rsize != nfss->rsize ||
1912 data->wsize != nfss->wsize ||
1913 data->retrans != nfss->client->cl_timeout->to_retries ||
1914 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1915 data->acregmin != nfss->acregmin / HZ ||
1916 data->acregmax != nfss->acregmax / HZ ||
1917 data->acdirmin != nfss->acdirmin / HZ ||
1918 data->acdirmax != nfss->acdirmax / HZ ||
1919 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1920 data->nfs_server.port != nfss->port ||
1921 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1922 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1923 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1924 return -EINVAL;
1925
1926 return 0;
1927 }
1928
1929 static int
1930 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1931 {
1932 int error;
1933 struct nfs_server *nfss = sb->s_fs_info;
1934 struct nfs_parsed_mount_data *data;
1935 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1936 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1937 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1938
1939 /*
1940 * Userspace mount programs that send binary options generally send
1941 * them populated with default values. We have no way to know which
1942 * ones were explicitly specified. Fall back to legacy behavior and
1943 * just return success.
1944 */
1945 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1946 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1947 options->version <= 6))))
1948 return 0;
1949
1950 data = kzalloc(sizeof(*data), GFP_KERNEL);
1951 if (data == NULL)
1952 return -ENOMEM;
1953
1954 /* fill out struct with values from existing mount */
1955 data->flags = nfss->flags;
1956 data->rsize = nfss->rsize;
1957 data->wsize = nfss->wsize;
1958 data->retrans = nfss->client->cl_timeout->to_retries;
1959 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1960 data->acregmin = nfss->acregmin / HZ;
1961 data->acregmax = nfss->acregmax / HZ;
1962 data->acdirmin = nfss->acdirmin / HZ;
1963 data->acdirmax = nfss->acdirmax / HZ;
1964 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1965 data->nfs_server.port = nfss->port;
1966 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1967 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1968 data->nfs_server.addrlen);
1969
1970 /* overwrite those values with any that were specified */
1971 error = nfs_parse_mount_options((char *)options, data);
1972 if (error < 0)
1973 goto out;
1974
1975 /* compare new mount options with old ones */
1976 error = nfs_compare_remount_data(nfss, data);
1977 out:
1978 kfree(data);
1979 return error;
1980 }
1981
1982 /*
1983 * Initialise the common bits of the superblock
1984 */
1985 static inline void nfs_initialise_sb(struct super_block *sb)
1986 {
1987 struct nfs_server *server = NFS_SB(sb);
1988
1989 sb->s_magic = NFS_SUPER_MAGIC;
1990
1991 /* We probably want something more informative here */
1992 snprintf(sb->s_id, sizeof(sb->s_id),
1993 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1994
1995 if (sb->s_blocksize == 0)
1996 sb->s_blocksize = nfs_block_bits(server->wsize,
1997 &sb->s_blocksize_bits);
1998
1999 if (server->flags & NFS_MOUNT_NOAC)
2000 sb->s_flags |= MS_SYNCHRONOUS;
2001
2002 sb->s_bdi = &server->backing_dev_info;
2003
2004 nfs_super_set_maxbytes(sb, server->maxfilesize);
2005 }
2006
2007 /*
2008 * Finish setting up an NFS2/3 superblock
2009 */
2010 static void nfs_fill_super(struct super_block *sb,
2011 struct nfs_parsed_mount_data *data)
2012 {
2013 struct nfs_server *server = NFS_SB(sb);
2014
2015 sb->s_blocksize_bits = 0;
2016 sb->s_blocksize = 0;
2017 if (data->bsize)
2018 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2019
2020 if (server->nfs_client->rpc_ops->version == 3) {
2021 /* The VFS shouldn't apply the umask to mode bits. We will do
2022 * so ourselves when necessary.
2023 */
2024 sb->s_flags |= MS_POSIXACL;
2025 sb->s_time_gran = 1;
2026 }
2027
2028 sb->s_op = &nfs_sops;
2029 nfs_initialise_sb(sb);
2030 }
2031
2032 /*
2033 * Finish setting up a cloned NFS2/3 superblock
2034 */
2035 static void nfs_clone_super(struct super_block *sb,
2036 const struct super_block *old_sb)
2037 {
2038 struct nfs_server *server = NFS_SB(sb);
2039
2040 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2041 sb->s_blocksize = old_sb->s_blocksize;
2042 sb->s_maxbytes = old_sb->s_maxbytes;
2043
2044 if (server->nfs_client->rpc_ops->version == 3) {
2045 /* The VFS shouldn't apply the umask to mode bits. We will do
2046 * so ourselves when necessary.
2047 */
2048 sb->s_flags |= MS_POSIXACL;
2049 sb->s_time_gran = 1;
2050 }
2051
2052 sb->s_op = old_sb->s_op;
2053 nfs_initialise_sb(sb);
2054 }
2055
2056 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2057 {
2058 const struct nfs_server *a = s->s_fs_info;
2059 const struct rpc_clnt *clnt_a = a->client;
2060 const struct rpc_clnt *clnt_b = b->client;
2061
2062 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2063 goto Ebusy;
2064 if (a->nfs_client != b->nfs_client)
2065 goto Ebusy;
2066 if (a->flags != b->flags)
2067 goto Ebusy;
2068 if (a->wsize != b->wsize)
2069 goto Ebusy;
2070 if (a->rsize != b->rsize)
2071 goto Ebusy;
2072 if (a->acregmin != b->acregmin)
2073 goto Ebusy;
2074 if (a->acregmax != b->acregmax)
2075 goto Ebusy;
2076 if (a->acdirmin != b->acdirmin)
2077 goto Ebusy;
2078 if (a->acdirmax != b->acdirmax)
2079 goto Ebusy;
2080 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2081 goto Ebusy;
2082 return 1;
2083 Ebusy:
2084 return 0;
2085 }
2086
2087 struct nfs_sb_mountdata {
2088 struct nfs_server *server;
2089 int mntflags;
2090 };
2091
2092 static int nfs_set_super(struct super_block *s, void *data)
2093 {
2094 struct nfs_sb_mountdata *sb_mntdata = data;
2095 struct nfs_server *server = sb_mntdata->server;
2096 int ret;
2097
2098 s->s_flags = sb_mntdata->mntflags;
2099 s->s_fs_info = server;
2100 ret = set_anon_super(s, server);
2101 if (ret == 0)
2102 server->s_dev = s->s_dev;
2103 return ret;
2104 }
2105
2106 static int nfs_compare_super_address(struct nfs_server *server1,
2107 struct nfs_server *server2)
2108 {
2109 struct sockaddr *sap1, *sap2;
2110
2111 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2112 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2113
2114 if (sap1->sa_family != sap2->sa_family)
2115 return 0;
2116
2117 switch (sap1->sa_family) {
2118 case AF_INET: {
2119 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2120 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2121 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2122 return 0;
2123 if (sin1->sin_port != sin2->sin_port)
2124 return 0;
2125 break;
2126 }
2127 case AF_INET6: {
2128 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2129 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2130 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2131 return 0;
2132 if (sin1->sin6_port != sin2->sin6_port)
2133 return 0;
2134 break;
2135 }
2136 default:
2137 return 0;
2138 }
2139
2140 return 1;
2141 }
2142
2143 static int nfs_compare_super(struct super_block *sb, void *data)
2144 {
2145 struct nfs_sb_mountdata *sb_mntdata = data;
2146 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2147 int mntflags = sb_mntdata->mntflags;
2148
2149 if (!nfs_compare_super_address(old, server))
2150 return 0;
2151 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2152 if (old->flags & NFS_MOUNT_UNSHARED)
2153 return 0;
2154 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2155 return 0;
2156 return nfs_compare_mount_options(sb, server, mntflags);
2157 }
2158
2159 static int nfs_bdi_register(struct nfs_server *server)
2160 {
2161 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2162 }
2163
2164 static int nfs_get_sb(struct file_system_type *fs_type,
2165 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2166 {
2167 struct nfs_server *server = NULL;
2168 struct super_block *s;
2169 struct nfs_parsed_mount_data *data;
2170 struct nfs_fh *mntfh;
2171 struct dentry *mntroot;
2172 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2173 struct nfs_sb_mountdata sb_mntdata = {
2174 .mntflags = flags,
2175 };
2176 int error = -ENOMEM;
2177
2178 data = nfs_alloc_parsed_mount_data(3);
2179 mntfh = nfs_alloc_fhandle();
2180 if (data == NULL || mntfh == NULL)
2181 goto out_free_fh;
2182
2183 security_init_mnt_opts(&data->lsm_opts);
2184
2185 /* Validate the mount data */
2186 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2187 if (error < 0)
2188 goto out;
2189
2190 #ifdef CONFIG_NFS_V4
2191 if (data->version == 4) {
2192 error = nfs4_try_mount(flags, dev_name, data, mnt);
2193 kfree(data->client_address);
2194 kfree(data->nfs_server.export_path);
2195 goto out;
2196 }
2197 #endif /* CONFIG_NFS_V4 */
2198
2199 /* Get a volume representation */
2200 server = nfs_create_server(data, mntfh);
2201 if (IS_ERR(server)) {
2202 error = PTR_ERR(server);
2203 goto out;
2204 }
2205 sb_mntdata.server = server;
2206
2207 if (server->flags & NFS_MOUNT_UNSHARED)
2208 compare_super = NULL;
2209
2210 /* Get a superblock - note that we may end up sharing one that already exists */
2211 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2212 if (IS_ERR(s)) {
2213 error = PTR_ERR(s);
2214 goto out_err_nosb;
2215 }
2216
2217 if (s->s_fs_info != server) {
2218 nfs_free_server(server);
2219 server = NULL;
2220 } else {
2221 error = nfs_bdi_register(server);
2222 if (error)
2223 goto error_splat_bdi;
2224 }
2225
2226 if (!s->s_root) {
2227 /* initial superblock/root creation */
2228 nfs_fill_super(s, data);
2229 nfs_fscache_get_super_cookie(
2230 s, data ? data->fscache_uniq : NULL, NULL);
2231 }
2232
2233 mntroot = nfs_get_root(s, mntfh);
2234 if (IS_ERR(mntroot)) {
2235 error = PTR_ERR(mntroot);
2236 goto error_splat_super;
2237 }
2238
2239 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2240 if (error)
2241 goto error_splat_root;
2242
2243 s->s_flags |= MS_ACTIVE;
2244 mnt->mnt_sb = s;
2245 mnt->mnt_root = mntroot;
2246 error = 0;
2247
2248 out:
2249 kfree(data->nfs_server.hostname);
2250 kfree(data->mount_server.hostname);
2251 kfree(data->fscache_uniq);
2252 security_free_mnt_opts(&data->lsm_opts);
2253 out_free_fh:
2254 nfs_free_fhandle(mntfh);
2255 kfree(data);
2256 return error;
2257
2258 out_err_nosb:
2259 nfs_free_server(server);
2260 goto out;
2261
2262 error_splat_root:
2263 dput(mntroot);
2264 error_splat_super:
2265 if (server && !s->s_root)
2266 bdi_unregister(&server->backing_dev_info);
2267 error_splat_bdi:
2268 deactivate_locked_super(s);
2269 goto out;
2270 }
2271
2272 /*
2273 * Ensure that we unregister the bdi before kill_anon_super
2274 * releases the device name
2275 */
2276 static void nfs_put_super(struct super_block *s)
2277 {
2278 struct nfs_server *server = NFS_SB(s);
2279
2280 bdi_unregister(&server->backing_dev_info);
2281 }
2282
2283 /*
2284 * Destroy an NFS2/3 superblock
2285 */
2286 static void nfs_kill_super(struct super_block *s)
2287 {
2288 struct nfs_server *server = NFS_SB(s);
2289
2290 kill_anon_super(s);
2291 nfs_fscache_release_super_cookie(s);
2292 nfs_free_server(server);
2293 }
2294
2295 /*
2296 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2297 */
2298 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2299 const char *dev_name, void *raw_data,
2300 struct vfsmount *mnt)
2301 {
2302 struct nfs_clone_mount *data = raw_data;
2303 struct super_block *s;
2304 struct nfs_server *server;
2305 struct dentry *mntroot;
2306 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2307 struct nfs_sb_mountdata sb_mntdata = {
2308 .mntflags = flags,
2309 };
2310 int error;
2311
2312 dprintk("--> nfs_xdev_get_sb()\n");
2313
2314 /* create a new volume representation */
2315 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2316 if (IS_ERR(server)) {
2317 error = PTR_ERR(server);
2318 goto out_err_noserver;
2319 }
2320 sb_mntdata.server = server;
2321
2322 if (server->flags & NFS_MOUNT_UNSHARED)
2323 compare_super = NULL;
2324
2325 /* Get a superblock - note that we may end up sharing one that already exists */
2326 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2327 if (IS_ERR(s)) {
2328 error = PTR_ERR(s);
2329 goto out_err_nosb;
2330 }
2331
2332 if (s->s_fs_info != server) {
2333 nfs_free_server(server);
2334 server = NULL;
2335 } else {
2336 error = nfs_bdi_register(server);
2337 if (error)
2338 goto error_splat_bdi;
2339 }
2340
2341 if (!s->s_root) {
2342 /* initial superblock/root creation */
2343 nfs_clone_super(s, data->sb);
2344 nfs_fscache_get_super_cookie(s, NULL, data);
2345 }
2346
2347 mntroot = nfs_get_root(s, data->fh);
2348 if (IS_ERR(mntroot)) {
2349 error = PTR_ERR(mntroot);
2350 goto error_splat_super;
2351 }
2352 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2353 dput(mntroot);
2354 error = -ESTALE;
2355 goto error_splat_super;
2356 }
2357
2358 s->s_flags |= MS_ACTIVE;
2359 mnt->mnt_sb = s;
2360 mnt->mnt_root = mntroot;
2361
2362 /* clone any lsm security options from the parent to the new sb */
2363 security_sb_clone_mnt_opts(data->sb, s);
2364
2365 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2366 return 0;
2367
2368 out_err_nosb:
2369 nfs_free_server(server);
2370 out_err_noserver:
2371 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2372 return error;
2373
2374 error_splat_super:
2375 if (server && !s->s_root)
2376 bdi_unregister(&server->backing_dev_info);
2377 error_splat_bdi:
2378 deactivate_locked_super(s);
2379 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2380 return error;
2381 }
2382
2383 #ifdef CONFIG_NFS_V4
2384
2385 /*
2386 * Finish setting up a cloned NFS4 superblock
2387 */
2388 static void nfs4_clone_super(struct super_block *sb,
2389 const struct super_block *old_sb)
2390 {
2391 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2392 sb->s_blocksize = old_sb->s_blocksize;
2393 sb->s_maxbytes = old_sb->s_maxbytes;
2394 sb->s_time_gran = 1;
2395 sb->s_op = old_sb->s_op;
2396 nfs_initialise_sb(sb);
2397 }
2398
2399 /*
2400 * Set up an NFS4 superblock
2401 */
2402 static void nfs4_fill_super(struct super_block *sb)
2403 {
2404 sb->s_time_gran = 1;
2405 sb->s_op = &nfs4_sops;
2406 nfs_initialise_sb(sb);
2407 }
2408
2409 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2410 {
2411 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2412 }
2413
2414 static int nfs4_validate_text_mount_data(void *options,
2415 struct nfs_parsed_mount_data *args,
2416 const char *dev_name)
2417 {
2418 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2419
2420 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2421
2422 nfs_validate_transport_protocol(args);
2423
2424 nfs4_validate_mount_flags(args);
2425
2426 if (args->version != 4) {
2427 dfprintk(MOUNT,
2428 "NFS4: Illegal mount version\n");
2429 return -EINVAL;
2430 }
2431
2432 if (args->auth_flavor_len > 1) {
2433 dfprintk(MOUNT,
2434 "NFS4: Too many RPC auth flavours specified\n");
2435 return -EINVAL;
2436 }
2437
2438 if (args->client_address == NULL) {
2439 dfprintk(MOUNT,
2440 "NFS4: mount program didn't pass callback address\n");
2441 return -EINVAL;
2442 }
2443
2444 return nfs_parse_devname(dev_name,
2445 &args->nfs_server.hostname,
2446 NFS4_MAXNAMLEN,
2447 &args->nfs_server.export_path,
2448 NFS4_MAXPATHLEN);
2449 }
2450
2451 /*
2452 * Validate NFSv4 mount options
2453 */
2454 static int nfs4_validate_mount_data(void *options,
2455 struct nfs_parsed_mount_data *args,
2456 const char *dev_name)
2457 {
2458 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2459 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2460 char *c;
2461
2462 if (data == NULL)
2463 goto out_no_data;
2464
2465 switch (data->version) {
2466 case 1:
2467 if (data->host_addrlen > sizeof(args->nfs_server.address))
2468 goto out_no_address;
2469 if (data->host_addrlen == 0)
2470 goto out_no_address;
2471 args->nfs_server.addrlen = data->host_addrlen;
2472 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2473 return -EFAULT;
2474 if (!nfs_verify_server_address(sap))
2475 goto out_no_address;
2476
2477 if (data->auth_flavourlen) {
2478 if (data->auth_flavourlen > 1)
2479 goto out_inval_auth;
2480 if (copy_from_user(&args->auth_flavors[0],
2481 data->auth_flavours,
2482 sizeof(args->auth_flavors[0])))
2483 return -EFAULT;
2484 }
2485
2486 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2487 if (IS_ERR(c))
2488 return PTR_ERR(c);
2489 args->nfs_server.hostname = c;
2490
2491 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2492 if (IS_ERR(c))
2493 return PTR_ERR(c);
2494 args->nfs_server.export_path = c;
2495 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2496
2497 c = strndup_user(data->client_addr.data, 16);
2498 if (IS_ERR(c))
2499 return PTR_ERR(c);
2500 args->client_address = c;
2501
2502 /*
2503 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2504 * can deal with.
2505 */
2506
2507 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2508 args->rsize = data->rsize;
2509 args->wsize = data->wsize;
2510 args->timeo = data->timeo;
2511 args->retrans = data->retrans;
2512 args->acregmin = data->acregmin;
2513 args->acregmax = data->acregmax;
2514 args->acdirmin = data->acdirmin;
2515 args->acdirmax = data->acdirmax;
2516 args->nfs_server.protocol = data->proto;
2517 nfs_validate_transport_protocol(args);
2518
2519 break;
2520 default:
2521 if (nfs_parse_mount_options((char *)options, args) == 0)
2522 return -EINVAL;
2523
2524 if (!nfs_verify_server_address(sap))
2525 return -EINVAL;
2526
2527 return nfs4_validate_text_mount_data(options, args, dev_name);
2528 }
2529
2530 return 0;
2531
2532 out_no_data:
2533 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2534 return -EINVAL;
2535
2536 out_inval_auth:
2537 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2538 data->auth_flavourlen);
2539 return -EINVAL;
2540
2541 out_no_address:
2542 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2543 return -EINVAL;
2544 }
2545
2546 /*
2547 * Get the superblock for the NFS4 root partition
2548 */
2549 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2550 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2551 {
2552 struct nfs_parsed_mount_data *data = raw_data;
2553 struct super_block *s;
2554 struct nfs_server *server;
2555 struct nfs_fh *mntfh;
2556 struct dentry *mntroot;
2557 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2558 struct nfs_sb_mountdata sb_mntdata = {
2559 .mntflags = flags,
2560 };
2561 int error = -ENOMEM;
2562
2563 mntfh = nfs_alloc_fhandle();
2564 if (data == NULL || mntfh == NULL)
2565 goto out_free_fh;
2566
2567 security_init_mnt_opts(&data->lsm_opts);
2568
2569 /* Get a volume representation */
2570 server = nfs4_create_server(data, mntfh);
2571 if (IS_ERR(server)) {
2572 error = PTR_ERR(server);
2573 goto out;
2574 }
2575 sb_mntdata.server = server;
2576
2577 if (server->flags & NFS4_MOUNT_UNSHARED)
2578 compare_super = NULL;
2579
2580 /* Get a superblock - note that we may end up sharing one that already exists */
2581 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2582 if (IS_ERR(s)) {
2583 error = PTR_ERR(s);
2584 goto out_free;
2585 }
2586
2587 if (s->s_fs_info != server) {
2588 nfs_free_server(server);
2589 server = NULL;
2590 } else {
2591 error = nfs_bdi_register(server);
2592 if (error)
2593 goto error_splat_bdi;
2594 }
2595
2596 if (!s->s_root) {
2597 /* initial superblock/root creation */
2598 nfs4_fill_super(s);
2599 nfs_fscache_get_super_cookie(
2600 s, data ? data->fscache_uniq : NULL, NULL);
2601 }
2602
2603 mntroot = nfs4_get_root(s, mntfh);
2604 if (IS_ERR(mntroot)) {
2605 error = PTR_ERR(mntroot);
2606 goto error_splat_super;
2607 }
2608
2609 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2610 if (error)
2611 goto error_splat_root;
2612
2613 s->s_flags |= MS_ACTIVE;
2614 mnt->mnt_sb = s;
2615 mnt->mnt_root = mntroot;
2616 error = 0;
2617
2618 out:
2619 security_free_mnt_opts(&data->lsm_opts);
2620 out_free_fh:
2621 nfs_free_fhandle(mntfh);
2622 return error;
2623
2624 out_free:
2625 nfs_free_server(server);
2626 goto out;
2627
2628 error_splat_root:
2629 dput(mntroot);
2630 error_splat_super:
2631 if (server && !s->s_root)
2632 bdi_unregister(&server->backing_dev_info);
2633 error_splat_bdi:
2634 deactivate_locked_super(s);
2635 goto out;
2636 }
2637
2638 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2639 int flags, void *data, const char *hostname)
2640 {
2641 struct vfsmount *root_mnt;
2642 char *root_devname;
2643 size_t len;
2644
2645 len = strlen(hostname) + 3;
2646 root_devname = kmalloc(len, GFP_KERNEL);
2647 if (root_devname == NULL)
2648 return ERR_PTR(-ENOMEM);
2649 snprintf(root_devname, len, "%s:/", hostname);
2650 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2651 kfree(root_devname);
2652 return root_mnt;
2653 }
2654
2655 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2656 {
2657 char *page = (char *) __get_free_page(GFP_KERNEL);
2658 char *devname, *tmp;
2659
2660 if (page == NULL)
2661 return;
2662 devname = nfs_path(path->mnt->mnt_devname,
2663 path->mnt->mnt_root, path->dentry,
2664 page, PAGE_SIZE);
2665 if (IS_ERR(devname))
2666 goto out_freepage;
2667 tmp = kstrdup(devname, GFP_KERNEL);
2668 if (tmp == NULL)
2669 goto out_freepage;
2670 kfree(mnt->mnt_devname);
2671 mnt->mnt_devname = tmp;
2672 out_freepage:
2673 free_page((unsigned long)page);
2674 }
2675
2676 struct nfs_referral_count {
2677 struct list_head list;
2678 const struct task_struct *task;
2679 unsigned int referral_count;
2680 };
2681
2682 static LIST_HEAD(nfs_referral_count_list);
2683 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2684
2685 static struct nfs_referral_count *nfs_find_referral_count(void)
2686 {
2687 struct nfs_referral_count *p;
2688
2689 list_for_each_entry(p, &nfs_referral_count_list, list) {
2690 if (p->task == current)
2691 return p;
2692 }
2693 return NULL;
2694 }
2695
2696 #define NFS_MAX_NESTED_REFERRALS 2
2697
2698 static int nfs_referral_loop_protect(void)
2699 {
2700 struct nfs_referral_count *p, *new;
2701 int ret = -ENOMEM;
2702
2703 new = kmalloc(sizeof(*new), GFP_KERNEL);
2704 if (!new)
2705 goto out;
2706 new->task = current;
2707 new->referral_count = 1;
2708
2709 ret = 0;
2710 spin_lock(&nfs_referral_count_list_lock);
2711 p = nfs_find_referral_count();
2712 if (p != NULL) {
2713 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2714 ret = -ELOOP;
2715 else
2716 p->referral_count++;
2717 } else {
2718 list_add(&new->list, &nfs_referral_count_list);
2719 new = NULL;
2720 }
2721 spin_unlock(&nfs_referral_count_list_lock);
2722 kfree(new);
2723 out:
2724 return ret;
2725 }
2726
2727 static void nfs_referral_loop_unprotect(void)
2728 {
2729 struct nfs_referral_count *p;
2730
2731 spin_lock(&nfs_referral_count_list_lock);
2732 p = nfs_find_referral_count();
2733 p->referral_count--;
2734 if (p->referral_count == 0)
2735 list_del(&p->list);
2736 else
2737 p = NULL;
2738 spin_unlock(&nfs_referral_count_list_lock);
2739 kfree(p);
2740 }
2741
2742 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2743 const char *export_path, struct vfsmount *mnt_target)
2744 {
2745 struct nameidata *nd = NULL;
2746 struct mnt_namespace *ns_private;
2747 struct super_block *s;
2748 int ret;
2749
2750 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2751 if (nd == NULL)
2752 return -ENOMEM;
2753
2754 ns_private = create_mnt_ns(root_mnt);
2755 ret = PTR_ERR(ns_private);
2756 if (IS_ERR(ns_private))
2757 goto out_mntput;
2758
2759 ret = nfs_referral_loop_protect();
2760 if (ret != 0)
2761 goto out_put_mnt_ns;
2762
2763 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2764 export_path, LOOKUP_FOLLOW, nd);
2765
2766 nfs_referral_loop_unprotect();
2767 put_mnt_ns(ns_private);
2768
2769 if (ret != 0)
2770 goto out_err;
2771
2772 s = nd->path.mnt->mnt_sb;
2773 atomic_inc(&s->s_active);
2774 mnt_target->mnt_sb = s;
2775 mnt_target->mnt_root = dget(nd->path.dentry);
2776
2777 /* Correct the device pathname */
2778 nfs_fix_devname(&nd->path, mnt_target);
2779
2780 path_put(&nd->path);
2781 kfree(nd);
2782 down_write(&s->s_umount);
2783 return 0;
2784 out_put_mnt_ns:
2785 put_mnt_ns(ns_private);
2786 out_mntput:
2787 mntput(root_mnt);
2788 out_err:
2789 kfree(nd);
2790 return ret;
2791 }
2792
2793 static int nfs4_try_mount(int flags, const char *dev_name,
2794 struct nfs_parsed_mount_data *data,
2795 struct vfsmount *mnt)
2796 {
2797 char *export_path;
2798 struct vfsmount *root_mnt;
2799 int error;
2800
2801 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2802
2803 export_path = data->nfs_server.export_path;
2804 data->nfs_server.export_path = "/";
2805 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2806 data->nfs_server.hostname);
2807 data->nfs_server.export_path = export_path;
2808
2809 error = PTR_ERR(root_mnt);
2810 if (IS_ERR(root_mnt))
2811 goto out;
2812
2813 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2814
2815 out:
2816 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2817 error != 0 ? " [error]" : "");
2818 return error;
2819 }
2820
2821 /*
2822 * Get the superblock for an NFS4 mountpoint
2823 */
2824 static int nfs4_get_sb(struct file_system_type *fs_type,
2825 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2826 {
2827 struct nfs_parsed_mount_data *data;
2828 int error = -ENOMEM;
2829
2830 data = nfs_alloc_parsed_mount_data(4);
2831 if (data == NULL)
2832 goto out_free_data;
2833
2834 /* Validate the mount data */
2835 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2836 if (error < 0)
2837 goto out;
2838
2839 error = nfs4_try_mount(flags, dev_name, data, mnt);
2840
2841 out:
2842 kfree(data->client_address);
2843 kfree(data->nfs_server.export_path);
2844 kfree(data->nfs_server.hostname);
2845 kfree(data->fscache_uniq);
2846 out_free_data:
2847 kfree(data);
2848 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2849 error != 0 ? " [error]" : "");
2850 return error;
2851 }
2852
2853 static void nfs4_kill_super(struct super_block *sb)
2854 {
2855 struct nfs_server *server = NFS_SB(sb);
2856
2857 dprintk("--> %s\n", __func__);
2858 nfs_super_return_all_delegations(sb);
2859 kill_anon_super(sb);
2860 nfs_fscache_release_super_cookie(sb);
2861 nfs_free_server(server);
2862 dprintk("<-- %s\n", __func__);
2863 }
2864
2865 /*
2866 * Clone an NFS4 server record on xdev traversal (FSID-change)
2867 */
2868 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2869 const char *dev_name, void *raw_data,
2870 struct vfsmount *mnt)
2871 {
2872 struct nfs_clone_mount *data = raw_data;
2873 struct super_block *s;
2874 struct nfs_server *server;
2875 struct dentry *mntroot;
2876 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2877 struct nfs_sb_mountdata sb_mntdata = {
2878 .mntflags = flags,
2879 };
2880 int error;
2881
2882 dprintk("--> nfs4_xdev_get_sb()\n");
2883
2884 /* create a new volume representation */
2885 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2886 if (IS_ERR(server)) {
2887 error = PTR_ERR(server);
2888 goto out_err_noserver;
2889 }
2890 sb_mntdata.server = server;
2891
2892 if (server->flags & NFS4_MOUNT_UNSHARED)
2893 compare_super = NULL;
2894
2895 /* Get a superblock - note that we may end up sharing one that already exists */
2896 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2897 if (IS_ERR(s)) {
2898 error = PTR_ERR(s);
2899 goto out_err_nosb;
2900 }
2901
2902 if (s->s_fs_info != server) {
2903 nfs_free_server(server);
2904 server = NULL;
2905 } else {
2906 error = nfs_bdi_register(server);
2907 if (error)
2908 goto error_splat_bdi;
2909 }
2910
2911 if (!s->s_root) {
2912 /* initial superblock/root creation */
2913 nfs4_clone_super(s, data->sb);
2914 nfs_fscache_get_super_cookie(s, NULL, data);
2915 }
2916
2917 mntroot = nfs4_get_root(s, data->fh);
2918 if (IS_ERR(mntroot)) {
2919 error = PTR_ERR(mntroot);
2920 goto error_splat_super;
2921 }
2922 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2923 dput(mntroot);
2924 error = -ESTALE;
2925 goto error_splat_super;
2926 }
2927
2928 s->s_flags |= MS_ACTIVE;
2929 mnt->mnt_sb = s;
2930 mnt->mnt_root = mntroot;
2931
2932 security_sb_clone_mnt_opts(data->sb, s);
2933
2934 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2935 return 0;
2936
2937 out_err_nosb:
2938 nfs_free_server(server);
2939 out_err_noserver:
2940 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2941 return error;
2942
2943 error_splat_super:
2944 if (server && !s->s_root)
2945 bdi_unregister(&server->backing_dev_info);
2946 error_splat_bdi:
2947 deactivate_locked_super(s);
2948 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2949 return error;
2950 }
2951
2952 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2953 int flags, const char *dev_name, void *raw_data,
2954 struct vfsmount *mnt)
2955 {
2956 struct nfs_clone_mount *data = raw_data;
2957 struct super_block *s;
2958 struct nfs_server *server;
2959 struct dentry *mntroot;
2960 struct nfs_fh *mntfh;
2961 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2962 struct nfs_sb_mountdata sb_mntdata = {
2963 .mntflags = flags,
2964 };
2965 int error = -ENOMEM;
2966
2967 dprintk("--> nfs4_referral_get_sb()\n");
2968
2969 mntfh = nfs_alloc_fhandle();
2970 if (mntfh == NULL)
2971 goto out_err_nofh;
2972
2973 /* create a new volume representation */
2974 server = nfs4_create_referral_server(data, mntfh);
2975 if (IS_ERR(server)) {
2976 error = PTR_ERR(server);
2977 goto out_err_noserver;
2978 }
2979 sb_mntdata.server = server;
2980
2981 if (server->flags & NFS4_MOUNT_UNSHARED)
2982 compare_super = NULL;
2983
2984 /* Get a superblock - note that we may end up sharing one that already exists */
2985 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2986 if (IS_ERR(s)) {
2987 error = PTR_ERR(s);
2988 goto out_err_nosb;
2989 }
2990
2991 if (s->s_fs_info != server) {
2992 nfs_free_server(server);
2993 server = NULL;
2994 } else {
2995 error = nfs_bdi_register(server);
2996 if (error)
2997 goto error_splat_bdi;
2998 }
2999
3000 if (!s->s_root) {
3001 /* initial superblock/root creation */
3002 nfs4_fill_super(s);
3003 nfs_fscache_get_super_cookie(s, NULL, data);
3004 }
3005
3006 mntroot = nfs4_get_root(s, mntfh);
3007 if (IS_ERR(mntroot)) {
3008 error = PTR_ERR(mntroot);
3009 goto error_splat_super;
3010 }
3011 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3012 dput(mntroot);
3013 error = -ESTALE;
3014 goto error_splat_super;
3015 }
3016
3017 s->s_flags |= MS_ACTIVE;
3018 mnt->mnt_sb = s;
3019 mnt->mnt_root = mntroot;
3020
3021 security_sb_clone_mnt_opts(data->sb, s);
3022
3023 nfs_free_fhandle(mntfh);
3024 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3025 return 0;
3026
3027 out_err_nosb:
3028 nfs_free_server(server);
3029 out_err_noserver:
3030 nfs_free_fhandle(mntfh);
3031 out_err_nofh:
3032 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3033 return error;
3034
3035 error_splat_super:
3036 if (server && !s->s_root)
3037 bdi_unregister(&server->backing_dev_info);
3038 error_splat_bdi:
3039 deactivate_locked_super(s);
3040 nfs_free_fhandle(mntfh);
3041 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3042 return error;
3043 }
3044
3045 /*
3046 * Create an NFS4 server record on referral traversal
3047 */
3048 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3049 int flags, const char *dev_name, void *raw_data,
3050 struct vfsmount *mnt)
3051 {
3052 struct nfs_clone_mount *data = raw_data;
3053 char *export_path;
3054 struct vfsmount *root_mnt;
3055 int error;
3056
3057 dprintk("--> nfs4_referral_get_sb()\n");
3058
3059 export_path = data->mnt_path;
3060 data->mnt_path = "/";
3061
3062 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3063 flags, data, data->hostname);
3064 data->mnt_path = export_path;
3065
3066 error = PTR_ERR(root_mnt);
3067 if (IS_ERR(root_mnt))
3068 goto out;
3069
3070 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3071 out:
3072 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3073 error != 0 ? " [error]" : "");
3074 return error;
3075 }
3076
3077 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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