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Merge branch 'for-linus' of git://neil.brown.name/md
[mirror_ubuntu-zesty-kernel.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 <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66
67 #define NFSDBG_FACILITY NFSDBG_VFS
68
69 enum {
70 /* Mount options that take no arguments */
71 Opt_soft, Opt_hard,
72 Opt_posix, Opt_noposix,
73 Opt_cto, Opt_nocto,
74 Opt_ac, Opt_noac,
75 Opt_lock, Opt_nolock,
76 Opt_v2, Opt_v3, Opt_v4,
77 Opt_udp, Opt_tcp, Opt_rdma,
78 Opt_acl, Opt_noacl,
79 Opt_rdirplus, Opt_nordirplus,
80 Opt_sharecache, Opt_nosharecache,
81 Opt_resvport, Opt_noresvport,
82 Opt_fscache, Opt_nofscache,
83
84 /* Mount options that take integer arguments */
85 Opt_port,
86 Opt_rsize, Opt_wsize, Opt_bsize,
87 Opt_timeo, Opt_retrans,
88 Opt_acregmin, Opt_acregmax,
89 Opt_acdirmin, Opt_acdirmax,
90 Opt_actimeo,
91 Opt_namelen,
92 Opt_mountport,
93 Opt_mountvers,
94 Opt_nfsvers,
95 Opt_minorversion,
96
97 /* Mount options that take string arguments */
98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
100 Opt_lookupcache,
101 Opt_fscache_uniq,
102
103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
105
106 Opt_err
107 };
108
109 static const match_table_t nfs_mount_option_tokens = {
110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
112 { Opt_userspace, "retry=%s" },
113
114 { Opt_sloppy, "sloppy" },
115
116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
120 { Opt_posix, "posix" },
121 { Opt_noposix, "noposix" },
122 { Opt_cto, "cto" },
123 { Opt_nocto, "nocto" },
124 { Opt_ac, "ac" },
125 { Opt_noac, "noac" },
126 { Opt_lock, "lock" },
127 { Opt_nolock, "nolock" },
128 { Opt_v2, "v2" },
129 { Opt_v3, "v3" },
130 { Opt_v4, "v4" },
131 { Opt_udp, "udp" },
132 { Opt_tcp, "tcp" },
133 { Opt_rdma, "rdma" },
134 { Opt_acl, "acl" },
135 { Opt_noacl, "noacl" },
136 { Opt_rdirplus, "rdirplus" },
137 { Opt_nordirplus, "nordirplus" },
138 { Opt_sharecache, "sharecache" },
139 { Opt_nosharecache, "nosharecache" },
140 { Opt_resvport, "resvport" },
141 { Opt_noresvport, "noresvport" },
142 { Opt_fscache, "fsc" },
143 { Opt_fscache_uniq, "fsc=%s" },
144 { Opt_nofscache, "nofsc" },
145
146 { Opt_port, "port=%s" },
147 { Opt_rsize, "rsize=%s" },
148 { Opt_wsize, "wsize=%s" },
149 { Opt_bsize, "bsize=%s" },
150 { Opt_timeo, "timeo=%s" },
151 { Opt_retrans, "retrans=%s" },
152 { Opt_acregmin, "acregmin=%s" },
153 { Opt_acregmax, "acregmax=%s" },
154 { Opt_acdirmin, "acdirmin=%s" },
155 { Opt_acdirmax, "acdirmax=%s" },
156 { Opt_actimeo, "actimeo=%s" },
157 { Opt_namelen, "namlen=%s" },
158 { Opt_mountport, "mountport=%s" },
159 { Opt_mountvers, "mountvers=%s" },
160 { Opt_nfsvers, "nfsvers=%s" },
161 { Opt_nfsvers, "vers=%s" },
162 { Opt_minorversion, "minorversion=%s" },
163
164 { Opt_sec, "sec=%s" },
165 { Opt_proto, "proto=%s" },
166 { Opt_mountproto, "mountproto=%s" },
167 { Opt_addr, "addr=%s" },
168 { Opt_clientaddr, "clientaddr=%s" },
169 { Opt_mounthost, "mounthost=%s" },
170 { Opt_mountaddr, "mountaddr=%s" },
171
172 { Opt_lookupcache, "lookupcache=%s" },
173
174 { Opt_err, NULL }
175 };
176
177 enum {
178 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
179
180 Opt_xprt_err
181 };
182
183 static const match_table_t nfs_xprt_protocol_tokens = {
184 { Opt_xprt_udp, "udp" },
185 { Opt_xprt_udp6, "udp6" },
186 { Opt_xprt_tcp, "tcp" },
187 { Opt_xprt_tcp6, "tcp6" },
188 { Opt_xprt_rdma, "rdma" },
189
190 { Opt_xprt_err, NULL }
191 };
192
193 enum {
194 Opt_sec_none, Opt_sec_sys,
195 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
196 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
197 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
198
199 Opt_sec_err
200 };
201
202 static const match_table_t nfs_secflavor_tokens = {
203 { Opt_sec_none, "none" },
204 { Opt_sec_none, "null" },
205 { Opt_sec_sys, "sys" },
206
207 { Opt_sec_krb5, "krb5" },
208 { Opt_sec_krb5i, "krb5i" },
209 { Opt_sec_krb5p, "krb5p" },
210
211 { Opt_sec_lkey, "lkey" },
212 { Opt_sec_lkeyi, "lkeyi" },
213 { Opt_sec_lkeyp, "lkeyp" },
214
215 { Opt_sec_spkm, "spkm3" },
216 { Opt_sec_spkmi, "spkm3i" },
217 { Opt_sec_spkmp, "spkm3p" },
218
219 { Opt_sec_err, NULL }
220 };
221
222 enum {
223 Opt_lookupcache_all, Opt_lookupcache_positive,
224 Opt_lookupcache_none,
225
226 Opt_lookupcache_err
227 };
228
229 static match_table_t nfs_lookupcache_tokens = {
230 { Opt_lookupcache_all, "all" },
231 { Opt_lookupcache_positive, "pos" },
232 { Opt_lookupcache_positive, "positive" },
233 { Opt_lookupcache_none, "none" },
234
235 { Opt_lookupcache_err, NULL }
236 };
237
238
239 static void nfs_umount_begin(struct super_block *);
240 static int nfs_statfs(struct dentry *, struct kstatfs *);
241 static int nfs_show_options(struct seq_file *, struct vfsmount *);
242 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
243 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
244 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
246 static void nfs_put_super(struct super_block *);
247 static void nfs_kill_super(struct super_block *);
248 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
249
250 static struct file_system_type nfs_fs_type = {
251 .owner = THIS_MODULE,
252 .name = "nfs",
253 .get_sb = nfs_get_sb,
254 .kill_sb = nfs_kill_super,
255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
256 };
257
258 struct file_system_type nfs_xdev_fs_type = {
259 .owner = THIS_MODULE,
260 .name = "nfs",
261 .get_sb = nfs_xdev_get_sb,
262 .kill_sb = nfs_kill_super,
263 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
264 };
265
266 static const struct super_operations nfs_sops = {
267 .alloc_inode = nfs_alloc_inode,
268 .destroy_inode = nfs_destroy_inode,
269 .write_inode = nfs_write_inode,
270 .put_super = nfs_put_super,
271 .statfs = nfs_statfs,
272 .clear_inode = nfs_clear_inode,
273 .umount_begin = nfs_umount_begin,
274 .show_options = nfs_show_options,
275 .show_stats = nfs_show_stats,
276 .remount_fs = nfs_remount,
277 };
278
279 #ifdef CONFIG_NFS_V4
280 static int nfs4_validate_text_mount_data(void *options,
281 struct nfs_parsed_mount_data *args, const char *dev_name);
282 static int nfs4_try_mount(int flags, const char *dev_name,
283 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
284 static int nfs4_get_sb(struct file_system_type *fs_type,
285 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
286 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
287 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
288 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
290 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
291 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
292 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
293 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
294 static void nfs4_kill_super(struct super_block *sb);
295
296 static struct file_system_type nfs4_fs_type = {
297 .owner = THIS_MODULE,
298 .name = "nfs4",
299 .get_sb = nfs4_get_sb,
300 .kill_sb = nfs4_kill_super,
301 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
302 };
303
304 static struct file_system_type nfs4_remote_fs_type = {
305 .owner = THIS_MODULE,
306 .name = "nfs4",
307 .get_sb = nfs4_remote_get_sb,
308 .kill_sb = nfs4_kill_super,
309 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
310 };
311
312 struct file_system_type nfs4_xdev_fs_type = {
313 .owner = THIS_MODULE,
314 .name = "nfs4",
315 .get_sb = nfs4_xdev_get_sb,
316 .kill_sb = nfs4_kill_super,
317 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
318 };
319
320 static struct file_system_type nfs4_remote_referral_fs_type = {
321 .owner = THIS_MODULE,
322 .name = "nfs4",
323 .get_sb = nfs4_remote_referral_get_sb,
324 .kill_sb = nfs4_kill_super,
325 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
326 };
327
328 struct file_system_type nfs4_referral_fs_type = {
329 .owner = THIS_MODULE,
330 .name = "nfs4",
331 .get_sb = nfs4_referral_get_sb,
332 .kill_sb = nfs4_kill_super,
333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
334 };
335
336 static const struct super_operations nfs4_sops = {
337 .alloc_inode = nfs_alloc_inode,
338 .destroy_inode = nfs_destroy_inode,
339 .write_inode = nfs_write_inode,
340 .put_super = nfs_put_super,
341 .statfs = nfs_statfs,
342 .clear_inode = nfs4_clear_inode,
343 .umount_begin = nfs_umount_begin,
344 .show_options = nfs_show_options,
345 .show_stats = nfs_show_stats,
346 .remount_fs = nfs_remount,
347 };
348 #endif
349
350 static struct shrinker acl_shrinker = {
351 .shrink = nfs_access_cache_shrinker,
352 .seeks = DEFAULT_SEEKS,
353 };
354
355 /*
356 * Register the NFS filesystems
357 */
358 int __init register_nfs_fs(void)
359 {
360 int ret;
361
362 ret = register_filesystem(&nfs_fs_type);
363 if (ret < 0)
364 goto error_0;
365
366 ret = nfs_register_sysctl();
367 if (ret < 0)
368 goto error_1;
369 #ifdef CONFIG_NFS_V4
370 ret = register_filesystem(&nfs4_fs_type);
371 if (ret < 0)
372 goto error_2;
373 #endif
374 register_shrinker(&acl_shrinker);
375 return 0;
376
377 #ifdef CONFIG_NFS_V4
378 error_2:
379 nfs_unregister_sysctl();
380 #endif
381 error_1:
382 unregister_filesystem(&nfs_fs_type);
383 error_0:
384 return ret;
385 }
386
387 /*
388 * Unregister the NFS filesystems
389 */
390 void __exit unregister_nfs_fs(void)
391 {
392 unregister_shrinker(&acl_shrinker);
393 #ifdef CONFIG_NFS_V4
394 unregister_filesystem(&nfs4_fs_type);
395 #endif
396 nfs_unregister_sysctl();
397 unregister_filesystem(&nfs_fs_type);
398 }
399
400 void nfs_sb_active(struct super_block *sb)
401 {
402 struct nfs_server *server = NFS_SB(sb);
403
404 if (atomic_inc_return(&server->active) == 1)
405 atomic_inc(&sb->s_active);
406 }
407
408 void nfs_sb_deactive(struct super_block *sb)
409 {
410 struct nfs_server *server = NFS_SB(sb);
411
412 if (atomic_dec_and_test(&server->active))
413 deactivate_super(sb);
414 }
415
416 /*
417 * Deliver file system statistics to userspace
418 */
419 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
420 {
421 struct nfs_server *server = NFS_SB(dentry->d_sb);
422 unsigned char blockbits;
423 unsigned long blockres;
424 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
425 struct nfs_fattr fattr;
426 struct nfs_fsstat res = {
427 .fattr = &fattr,
428 };
429 int error;
430
431 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
432 if (error < 0)
433 goto out_err;
434 buf->f_type = NFS_SUPER_MAGIC;
435
436 /*
437 * Current versions of glibc do not correctly handle the
438 * case where f_frsize != f_bsize. Eventually we want to
439 * report the value of wtmult in this field.
440 */
441 buf->f_frsize = dentry->d_sb->s_blocksize;
442
443 /*
444 * On most *nix systems, f_blocks, f_bfree, and f_bavail
445 * are reported in units of f_frsize. Linux hasn't had
446 * an f_frsize field in its statfs struct until recently,
447 * thus historically Linux's sys_statfs reports these
448 * fields in units of f_bsize.
449 */
450 buf->f_bsize = dentry->d_sb->s_blocksize;
451 blockbits = dentry->d_sb->s_blocksize_bits;
452 blockres = (1 << blockbits) - 1;
453 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
454 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
455 buf->f_bavail = (res.abytes + blockres) >> blockbits;
456
457 buf->f_files = res.tfiles;
458 buf->f_ffree = res.afiles;
459
460 buf->f_namelen = server->namelen;
461
462 return 0;
463
464 out_err:
465 dprintk("%s: statfs error = %d\n", __func__, -error);
466 return error;
467 }
468
469 /*
470 * Map the security flavour number to a name
471 */
472 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
473 {
474 static const struct {
475 rpc_authflavor_t flavour;
476 const char *str;
477 } sec_flavours[] = {
478 { RPC_AUTH_NULL, "null" },
479 { RPC_AUTH_UNIX, "sys" },
480 { RPC_AUTH_GSS_KRB5, "krb5" },
481 { RPC_AUTH_GSS_KRB5I, "krb5i" },
482 { RPC_AUTH_GSS_KRB5P, "krb5p" },
483 { RPC_AUTH_GSS_LKEY, "lkey" },
484 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
485 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
486 { RPC_AUTH_GSS_SPKM, "spkm" },
487 { RPC_AUTH_GSS_SPKMI, "spkmi" },
488 { RPC_AUTH_GSS_SPKMP, "spkmp" },
489 { UINT_MAX, "unknown" }
490 };
491 int i;
492
493 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
494 if (sec_flavours[i].flavour == flavour)
495 break;
496 }
497 return sec_flavours[i].str;
498 }
499
500 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
501 int showdefaults)
502 {
503 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
504
505 seq_printf(m, ",mountproto=");
506 switch (sap->sa_family) {
507 case AF_INET:
508 switch (nfss->mountd_protocol) {
509 case IPPROTO_UDP:
510 seq_printf(m, RPCBIND_NETID_UDP);
511 break;
512 case IPPROTO_TCP:
513 seq_printf(m, RPCBIND_NETID_TCP);
514 break;
515 default:
516 if (showdefaults)
517 seq_printf(m, "auto");
518 }
519 break;
520 case AF_INET6:
521 switch (nfss->mountd_protocol) {
522 case IPPROTO_UDP:
523 seq_printf(m, RPCBIND_NETID_UDP6);
524 break;
525 case IPPROTO_TCP:
526 seq_printf(m, RPCBIND_NETID_TCP6);
527 break;
528 default:
529 if (showdefaults)
530 seq_printf(m, "auto");
531 }
532 break;
533 default:
534 if (showdefaults)
535 seq_printf(m, "auto");
536 }
537 }
538
539 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
540 int showdefaults)
541 {
542 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
543
544 switch (sap->sa_family) {
545 case AF_INET: {
546 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
547 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
548 break;
549 }
550 case AF_INET6: {
551 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
552 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
553 break;
554 }
555 default:
556 if (showdefaults)
557 seq_printf(m, ",mountaddr=unspecified");
558 }
559
560 if (nfss->mountd_version || showdefaults)
561 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
562 if (nfss->mountd_port || showdefaults)
563 seq_printf(m, ",mountport=%u", nfss->mountd_port);
564
565 nfs_show_mountd_netid(m, nfss, showdefaults);
566 }
567
568 /*
569 * Describe the mount options in force on this server representation
570 */
571 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
572 int showdefaults)
573 {
574 static const struct proc_nfs_info {
575 int flag;
576 const char *str;
577 const char *nostr;
578 } nfs_info[] = {
579 { NFS_MOUNT_SOFT, ",soft", ",hard" },
580 { NFS_MOUNT_POSIX, ",posix", "" },
581 { NFS_MOUNT_NOCTO, ",nocto", "" },
582 { NFS_MOUNT_NOAC, ",noac", "" },
583 { NFS_MOUNT_NONLM, ",nolock", "" },
584 { NFS_MOUNT_NOACL, ",noacl", "" },
585 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
586 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
587 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
588 { 0, NULL, NULL }
589 };
590 const struct proc_nfs_info *nfs_infop;
591 struct nfs_client *clp = nfss->nfs_client;
592 u32 version = clp->rpc_ops->version;
593
594 seq_printf(m, ",vers=%u", version);
595 seq_printf(m, ",rsize=%u", nfss->rsize);
596 seq_printf(m, ",wsize=%u", nfss->wsize);
597 if (nfss->bsize != 0)
598 seq_printf(m, ",bsize=%u", nfss->bsize);
599 seq_printf(m, ",namlen=%u", nfss->namelen);
600 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
601 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
602 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
603 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
604 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
605 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
606 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
607 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
608 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
609 if (nfss->flags & nfs_infop->flag)
610 seq_puts(m, nfs_infop->str);
611 else
612 seq_puts(m, nfs_infop->nostr);
613 }
614 seq_printf(m, ",proto=%s",
615 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
616 if (version == 4) {
617 if (nfss->port != NFS_PORT)
618 seq_printf(m, ",port=%u", nfss->port);
619 } else
620 if (nfss->port)
621 seq_printf(m, ",port=%u", nfss->port);
622
623 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
624 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
625 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
626
627 if (version != 4)
628 nfs_show_mountd_options(m, nfss, showdefaults);
629
630 #ifdef CONFIG_NFS_V4
631 if (clp->rpc_ops->version == 4)
632 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
633 #endif
634 if (nfss->options & NFS_OPTION_FSCACHE)
635 seq_printf(m, ",fsc");
636 }
637
638 /*
639 * Describe the mount options on this VFS mountpoint
640 */
641 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
642 {
643 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
644
645 nfs_show_mount_options(m, nfss, 0);
646
647 seq_printf(m, ",addr=%s",
648 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
649 RPC_DISPLAY_ADDR));
650
651 return 0;
652 }
653
654 /*
655 * Present statistical information for this VFS mountpoint
656 */
657 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
658 {
659 int i, cpu;
660 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
661 struct rpc_auth *auth = nfss->client->cl_auth;
662 struct nfs_iostats totals = { };
663
664 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
665
666 /*
667 * Display all mount option settings
668 */
669 seq_printf(m, "\n\topts:\t");
670 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
671 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
672 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
673 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
674 nfs_show_mount_options(m, nfss, 1);
675
676 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
677
678 seq_printf(m, "\n\tcaps:\t");
679 seq_printf(m, "caps=0x%x", nfss->caps);
680 seq_printf(m, ",wtmult=%u", nfss->wtmult);
681 seq_printf(m, ",dtsize=%u", nfss->dtsize);
682 seq_printf(m, ",bsize=%u", nfss->bsize);
683 seq_printf(m, ",namlen=%u", nfss->namelen);
684
685 #ifdef CONFIG_NFS_V4
686 if (nfss->nfs_client->rpc_ops->version == 4) {
687 seq_printf(m, "\n\tnfsv4:\t");
688 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
689 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
690 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
691 }
692 #endif
693
694 /*
695 * Display security flavor in effect for this mount
696 */
697 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
698 if (auth->au_flavor)
699 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
700
701 /*
702 * Display superblock I/O counters
703 */
704 for_each_possible_cpu(cpu) {
705 struct nfs_iostats *stats;
706
707 preempt_disable();
708 stats = per_cpu_ptr(nfss->io_stats, cpu);
709
710 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
711 totals.events[i] += stats->events[i];
712 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
713 totals.bytes[i] += stats->bytes[i];
714 #ifdef CONFIG_NFS_FSCACHE
715 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
716 totals.fscache[i] += stats->fscache[i];
717 #endif
718
719 preempt_enable();
720 }
721
722 seq_printf(m, "\n\tevents:\t");
723 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
724 seq_printf(m, "%lu ", totals.events[i]);
725 seq_printf(m, "\n\tbytes:\t");
726 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
727 seq_printf(m, "%Lu ", totals.bytes[i]);
728 #ifdef CONFIG_NFS_FSCACHE
729 if (nfss->options & NFS_OPTION_FSCACHE) {
730 seq_printf(m, "\n\tfsc:\t");
731 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
732 seq_printf(m, "%Lu ", totals.bytes[i]);
733 }
734 #endif
735 seq_printf(m, "\n");
736
737 rpc_print_iostats(m, nfss->client);
738
739 return 0;
740 }
741
742 /*
743 * Begin unmount by attempting to remove all automounted mountpoints we added
744 * in response to xdev traversals and referrals
745 */
746 static void nfs_umount_begin(struct super_block *sb)
747 {
748 struct nfs_server *server;
749 struct rpc_clnt *rpc;
750
751 server = NFS_SB(sb);
752 /* -EIO all pending I/O */
753 rpc = server->client_acl;
754 if (!IS_ERR(rpc))
755 rpc_killall_tasks(rpc);
756 rpc = server->client;
757 if (!IS_ERR(rpc))
758 rpc_killall_tasks(rpc);
759 }
760
761 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
762 {
763 struct nfs_parsed_mount_data *data;
764
765 data = kzalloc(sizeof(*data), GFP_KERNEL);
766 if (data) {
767 data->acregmin = NFS_DEF_ACREGMIN;
768 data->acregmax = NFS_DEF_ACREGMAX;
769 data->acdirmin = NFS_DEF_ACDIRMIN;
770 data->acdirmax = NFS_DEF_ACDIRMAX;
771 data->mount_server.port = NFS_UNSPEC_PORT;
772 data->nfs_server.port = NFS_UNSPEC_PORT;
773 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
774 data->auth_flavors[0] = RPC_AUTH_UNIX;
775 data->auth_flavor_len = 1;
776 data->version = version;
777 data->minorversion = 0;
778 }
779 return data;
780 }
781
782 /*
783 * Sanity-check a server address provided by the mount command.
784 *
785 * Address family must be initialized, and address must not be
786 * the ANY address for that family.
787 */
788 static int nfs_verify_server_address(struct sockaddr *addr)
789 {
790 switch (addr->sa_family) {
791 case AF_INET: {
792 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
793 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
794 }
795 case AF_INET6: {
796 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
797 return !ipv6_addr_any(sa);
798 }
799 }
800
801 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
802 return 0;
803 }
804
805 /*
806 * Select between a default port value and a user-specified port value.
807 * If a zero value is set, then autobind will be used.
808 */
809 static void nfs_set_port(struct sockaddr *sap, int *port,
810 const unsigned short default_port)
811 {
812 if (*port == NFS_UNSPEC_PORT)
813 *port = default_port;
814
815 rpc_set_port(sap, *port);
816 }
817
818 /*
819 * Sanity check the NFS transport protocol.
820 *
821 */
822 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
823 {
824 switch (mnt->nfs_server.protocol) {
825 case XPRT_TRANSPORT_UDP:
826 case XPRT_TRANSPORT_TCP:
827 case XPRT_TRANSPORT_RDMA:
828 break;
829 default:
830 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
831 }
832 }
833
834 /*
835 * For text based NFSv2/v3 mounts, the mount protocol transport default
836 * settings should depend upon the specified NFS transport.
837 */
838 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
839 {
840 nfs_validate_transport_protocol(mnt);
841
842 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
843 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
844 return;
845 switch (mnt->nfs_server.protocol) {
846 case XPRT_TRANSPORT_UDP:
847 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
848 break;
849 case XPRT_TRANSPORT_TCP:
850 case XPRT_TRANSPORT_RDMA:
851 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
852 }
853 }
854
855 /*
856 * Parse the value of the 'sec=' option.
857 */
858 static int nfs_parse_security_flavors(char *value,
859 struct nfs_parsed_mount_data *mnt)
860 {
861 substring_t args[MAX_OPT_ARGS];
862
863 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
864
865 switch (match_token(value, nfs_secflavor_tokens, args)) {
866 case Opt_sec_none:
867 mnt->auth_flavors[0] = RPC_AUTH_NULL;
868 break;
869 case Opt_sec_sys:
870 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
871 break;
872 case Opt_sec_krb5:
873 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
874 break;
875 case Opt_sec_krb5i:
876 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
877 break;
878 case Opt_sec_krb5p:
879 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
880 break;
881 case Opt_sec_lkey:
882 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
883 break;
884 case Opt_sec_lkeyi:
885 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
886 break;
887 case Opt_sec_lkeyp:
888 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
889 break;
890 case Opt_sec_spkm:
891 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
892 break;
893 case Opt_sec_spkmi:
894 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
895 break;
896 case Opt_sec_spkmp:
897 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
898 break;
899 default:
900 return 0;
901 }
902
903 mnt->auth_flavor_len = 1;
904 return 1;
905 }
906
907 /*
908 * Error-check and convert a string of mount options from user space into
909 * a data structure. The whole mount string is processed; bad options are
910 * skipped as they are encountered. If there were no errors, return 1;
911 * otherwise return 0 (zero).
912 */
913 static int nfs_parse_mount_options(char *raw,
914 struct nfs_parsed_mount_data *mnt)
915 {
916 char *p, *string, *secdata;
917 int rc, sloppy = 0, invalid_option = 0;
918 unsigned short protofamily = AF_UNSPEC;
919 unsigned short mountfamily = AF_UNSPEC;
920
921 if (!raw) {
922 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
923 return 1;
924 }
925 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
926
927 secdata = alloc_secdata();
928 if (!secdata)
929 goto out_nomem;
930
931 rc = security_sb_copy_data(raw, secdata);
932 if (rc)
933 goto out_security_failure;
934
935 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
936 if (rc)
937 goto out_security_failure;
938
939 free_secdata(secdata);
940
941 while ((p = strsep(&raw, ",")) != NULL) {
942 substring_t args[MAX_OPT_ARGS];
943 unsigned long option;
944 int token;
945
946 if (!*p)
947 continue;
948
949 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
950
951 token = match_token(p, nfs_mount_option_tokens, args);
952 switch (token) {
953
954 /*
955 * boolean options: foo/nofoo
956 */
957 case Opt_soft:
958 mnt->flags |= NFS_MOUNT_SOFT;
959 break;
960 case Opt_hard:
961 mnt->flags &= ~NFS_MOUNT_SOFT;
962 break;
963 case Opt_posix:
964 mnt->flags |= NFS_MOUNT_POSIX;
965 break;
966 case Opt_noposix:
967 mnt->flags &= ~NFS_MOUNT_POSIX;
968 break;
969 case Opt_cto:
970 mnt->flags &= ~NFS_MOUNT_NOCTO;
971 break;
972 case Opt_nocto:
973 mnt->flags |= NFS_MOUNT_NOCTO;
974 break;
975 case Opt_ac:
976 mnt->flags &= ~NFS_MOUNT_NOAC;
977 break;
978 case Opt_noac:
979 mnt->flags |= NFS_MOUNT_NOAC;
980 break;
981 case Opt_lock:
982 mnt->flags &= ~NFS_MOUNT_NONLM;
983 break;
984 case Opt_nolock:
985 mnt->flags |= NFS_MOUNT_NONLM;
986 break;
987 case Opt_v2:
988 mnt->flags &= ~NFS_MOUNT_VER3;
989 mnt->version = 2;
990 break;
991 case Opt_v3:
992 mnt->flags |= NFS_MOUNT_VER3;
993 mnt->version = 3;
994 break;
995 #ifdef CONFIG_NFS_V4
996 case Opt_v4:
997 mnt->flags &= ~NFS_MOUNT_VER3;
998 mnt->version = 4;
999 break;
1000 #endif
1001 case Opt_udp:
1002 mnt->flags &= ~NFS_MOUNT_TCP;
1003 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1004 break;
1005 case Opt_tcp:
1006 mnt->flags |= NFS_MOUNT_TCP;
1007 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1008 break;
1009 case Opt_rdma:
1010 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1011 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1012 xprt_load_transport(p);
1013 break;
1014 case Opt_acl:
1015 mnt->flags &= ~NFS_MOUNT_NOACL;
1016 break;
1017 case Opt_noacl:
1018 mnt->flags |= NFS_MOUNT_NOACL;
1019 break;
1020 case Opt_rdirplus:
1021 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1022 break;
1023 case Opt_nordirplus:
1024 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1025 break;
1026 case Opt_sharecache:
1027 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1028 break;
1029 case Opt_nosharecache:
1030 mnt->flags |= NFS_MOUNT_UNSHARED;
1031 break;
1032 case Opt_resvport:
1033 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1034 break;
1035 case Opt_noresvport:
1036 mnt->flags |= NFS_MOUNT_NORESVPORT;
1037 break;
1038 case Opt_fscache:
1039 mnt->options |= NFS_OPTION_FSCACHE;
1040 kfree(mnt->fscache_uniq);
1041 mnt->fscache_uniq = NULL;
1042 break;
1043 case Opt_nofscache:
1044 mnt->options &= ~NFS_OPTION_FSCACHE;
1045 kfree(mnt->fscache_uniq);
1046 mnt->fscache_uniq = NULL;
1047 break;
1048 case Opt_fscache_uniq:
1049 string = match_strdup(args);
1050 if (!string)
1051 goto out_nomem;
1052 kfree(mnt->fscache_uniq);
1053 mnt->fscache_uniq = string;
1054 mnt->options |= NFS_OPTION_FSCACHE;
1055 break;
1056
1057 /*
1058 * options that take numeric values
1059 */
1060 case Opt_port:
1061 string = match_strdup(args);
1062 if (string == NULL)
1063 goto out_nomem;
1064 rc = strict_strtoul(string, 10, &option);
1065 kfree(string);
1066 if (rc != 0 || option > USHORT_MAX)
1067 goto out_invalid_value;
1068 mnt->nfs_server.port = option;
1069 break;
1070 case Opt_rsize:
1071 string = match_strdup(args);
1072 if (string == NULL)
1073 goto out_nomem;
1074 rc = strict_strtoul(string, 10, &option);
1075 kfree(string);
1076 if (rc != 0)
1077 goto out_invalid_value;
1078 mnt->rsize = option;
1079 break;
1080 case Opt_wsize:
1081 string = match_strdup(args);
1082 if (string == NULL)
1083 goto out_nomem;
1084 rc = strict_strtoul(string, 10, &option);
1085 kfree(string);
1086 if (rc != 0)
1087 goto out_invalid_value;
1088 mnt->wsize = option;
1089 break;
1090 case Opt_bsize:
1091 string = match_strdup(args);
1092 if (string == NULL)
1093 goto out_nomem;
1094 rc = strict_strtoul(string, 10, &option);
1095 kfree(string);
1096 if (rc != 0)
1097 goto out_invalid_value;
1098 mnt->bsize = option;
1099 break;
1100 case Opt_timeo:
1101 string = match_strdup(args);
1102 if (string == NULL)
1103 goto out_nomem;
1104 rc = strict_strtoul(string, 10, &option);
1105 kfree(string);
1106 if (rc != 0 || option == 0)
1107 goto out_invalid_value;
1108 mnt->timeo = option;
1109 break;
1110 case Opt_retrans:
1111 string = match_strdup(args);
1112 if (string == NULL)
1113 goto out_nomem;
1114 rc = strict_strtoul(string, 10, &option);
1115 kfree(string);
1116 if (rc != 0 || option == 0)
1117 goto out_invalid_value;
1118 mnt->retrans = option;
1119 break;
1120 case Opt_acregmin:
1121 string = match_strdup(args);
1122 if (string == NULL)
1123 goto out_nomem;
1124 rc = strict_strtoul(string, 10, &option);
1125 kfree(string);
1126 if (rc != 0)
1127 goto out_invalid_value;
1128 mnt->acregmin = option;
1129 break;
1130 case Opt_acregmax:
1131 string = match_strdup(args);
1132 if (string == NULL)
1133 goto out_nomem;
1134 rc = strict_strtoul(string, 10, &option);
1135 kfree(string);
1136 if (rc != 0)
1137 goto out_invalid_value;
1138 mnt->acregmax = option;
1139 break;
1140 case Opt_acdirmin:
1141 string = match_strdup(args);
1142 if (string == NULL)
1143 goto out_nomem;
1144 rc = strict_strtoul(string, 10, &option);
1145 kfree(string);
1146 if (rc != 0)
1147 goto out_invalid_value;
1148 mnt->acdirmin = option;
1149 break;
1150 case Opt_acdirmax:
1151 string = match_strdup(args);
1152 if (string == NULL)
1153 goto out_nomem;
1154 rc = strict_strtoul(string, 10, &option);
1155 kfree(string);
1156 if (rc != 0)
1157 goto out_invalid_value;
1158 mnt->acdirmax = option;
1159 break;
1160 case Opt_actimeo:
1161 string = match_strdup(args);
1162 if (string == NULL)
1163 goto out_nomem;
1164 rc = strict_strtoul(string, 10, &option);
1165 kfree(string);
1166 if (rc != 0)
1167 goto out_invalid_value;
1168 mnt->acregmin = mnt->acregmax =
1169 mnt->acdirmin = mnt->acdirmax = option;
1170 break;
1171 case Opt_namelen:
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->namlen = option;
1180 break;
1181 case Opt_mountport:
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 || option > USHORT_MAX)
1188 goto out_invalid_value;
1189 mnt->mount_server.port = option;
1190 break;
1191 case Opt_mountvers:
1192 string = match_strdup(args);
1193 if (string == NULL)
1194 goto out_nomem;
1195 rc = strict_strtoul(string, 10, &option);
1196 kfree(string);
1197 if (rc != 0 ||
1198 option < NFS_MNT_VERSION ||
1199 option > NFS_MNT3_VERSION)
1200 goto out_invalid_value;
1201 mnt->mount_server.version = option;
1202 break;
1203 case Opt_nfsvers:
1204 string = match_strdup(args);
1205 if (string == NULL)
1206 goto out_nomem;
1207 rc = strict_strtoul(string, 10, &option);
1208 kfree(string);
1209 if (rc != 0)
1210 goto out_invalid_value;
1211 switch (option) {
1212 case NFS2_VERSION:
1213 mnt->flags &= ~NFS_MOUNT_VER3;
1214 mnt->version = 2;
1215 break;
1216 case NFS3_VERSION:
1217 mnt->flags |= NFS_MOUNT_VER3;
1218 mnt->version = 3;
1219 break;
1220 #ifdef CONFIG_NFS_V4
1221 case NFS4_VERSION:
1222 mnt->flags &= ~NFS_MOUNT_VER3;
1223 mnt->version = 4;
1224 break;
1225 #endif
1226 default:
1227 goto out_invalid_value;
1228 }
1229 break;
1230 case Opt_minorversion:
1231 string = match_strdup(args);
1232 if (string == NULL)
1233 goto out_nomem;
1234 rc = strict_strtoul(string, 10, &option);
1235 kfree(string);
1236 if (rc != 0)
1237 goto out_invalid_value;
1238 if (option > NFS4_MAX_MINOR_VERSION)
1239 goto out_invalid_value;
1240 mnt->minorversion = option;
1241 break;
1242
1243 /*
1244 * options that take text values
1245 */
1246 case Opt_sec:
1247 string = match_strdup(args);
1248 if (string == NULL)
1249 goto out_nomem;
1250 rc = nfs_parse_security_flavors(string, mnt);
1251 kfree(string);
1252 if (!rc) {
1253 dfprintk(MOUNT, "NFS: unrecognized "
1254 "security flavor\n");
1255 return 0;
1256 }
1257 break;
1258 case Opt_proto:
1259 string = match_strdup(args);
1260 if (string == NULL)
1261 goto out_nomem;
1262 token = match_token(string,
1263 nfs_xprt_protocol_tokens, args);
1264
1265 protofamily = AF_INET;
1266 switch (token) {
1267 case Opt_xprt_udp6:
1268 protofamily = AF_INET6;
1269 case Opt_xprt_udp:
1270 mnt->flags &= ~NFS_MOUNT_TCP;
1271 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1272 kfree(string);
1273 break;
1274 case Opt_xprt_tcp6:
1275 protofamily = AF_INET6;
1276 case Opt_xprt_tcp:
1277 mnt->flags |= NFS_MOUNT_TCP;
1278 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1279 kfree(string);
1280 break;
1281 case Opt_xprt_rdma:
1282 /* vector side protocols to TCP */
1283 mnt->flags |= NFS_MOUNT_TCP;
1284 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1285 xprt_load_transport(string);
1286 kfree(string);
1287 break;
1288 default:
1289 dfprintk(MOUNT, "NFS: unrecognized "
1290 "transport protocol\n");
1291 kfree(string);
1292 return 0;
1293 }
1294 break;
1295 case Opt_mountproto:
1296 string = match_strdup(args);
1297 if (string == NULL)
1298 goto out_nomem;
1299 token = match_token(string,
1300 nfs_xprt_protocol_tokens, args);
1301 kfree(string);
1302
1303 mountfamily = AF_INET;
1304 switch (token) {
1305 case Opt_xprt_udp6:
1306 mountfamily = AF_INET6;
1307 case Opt_xprt_udp:
1308 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1309 break;
1310 case Opt_xprt_tcp6:
1311 mountfamily = AF_INET6;
1312 case Opt_xprt_tcp:
1313 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1314 break;
1315 case Opt_xprt_rdma: /* not used for side protocols */
1316 default:
1317 dfprintk(MOUNT, "NFS: unrecognized "
1318 "transport protocol\n");
1319 return 0;
1320 }
1321 break;
1322 case Opt_addr:
1323 string = match_strdup(args);
1324 if (string == NULL)
1325 goto out_nomem;
1326 mnt->nfs_server.addrlen =
1327 rpc_pton(string, strlen(string),
1328 (struct sockaddr *)
1329 &mnt->nfs_server.address,
1330 sizeof(mnt->nfs_server.address));
1331 kfree(string);
1332 if (mnt->nfs_server.addrlen == 0)
1333 goto out_invalid_address;
1334 break;
1335 case Opt_clientaddr:
1336 string = match_strdup(args);
1337 if (string == NULL)
1338 goto out_nomem;
1339 kfree(mnt->client_address);
1340 mnt->client_address = string;
1341 break;
1342 case Opt_mounthost:
1343 string = match_strdup(args);
1344 if (string == NULL)
1345 goto out_nomem;
1346 kfree(mnt->mount_server.hostname);
1347 mnt->mount_server.hostname = string;
1348 break;
1349 case Opt_mountaddr:
1350 string = match_strdup(args);
1351 if (string == NULL)
1352 goto out_nomem;
1353 mnt->mount_server.addrlen =
1354 rpc_pton(string, strlen(string),
1355 (struct sockaddr *)
1356 &mnt->mount_server.address,
1357 sizeof(mnt->mount_server.address));
1358 kfree(string);
1359 if (mnt->mount_server.addrlen == 0)
1360 goto out_invalid_address;
1361 break;
1362 case Opt_lookupcache:
1363 string = match_strdup(args);
1364 if (string == NULL)
1365 goto out_nomem;
1366 token = match_token(string,
1367 nfs_lookupcache_tokens, args);
1368 kfree(string);
1369 switch (token) {
1370 case Opt_lookupcache_all:
1371 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1372 break;
1373 case Opt_lookupcache_positive:
1374 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1375 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1376 break;
1377 case Opt_lookupcache_none:
1378 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1379 break;
1380 default:
1381 dfprintk(MOUNT, "NFS: invalid "
1382 "lookupcache argument\n");
1383 return 0;
1384 };
1385 break;
1386
1387 /*
1388 * Special options
1389 */
1390 case Opt_sloppy:
1391 sloppy = 1;
1392 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1393 break;
1394 case Opt_userspace:
1395 case Opt_deprecated:
1396 dfprintk(MOUNT, "NFS: ignoring mount option "
1397 "'%s'\n", p);
1398 break;
1399
1400 default:
1401 invalid_option = 1;
1402 dfprintk(MOUNT, "NFS: unrecognized mount option "
1403 "'%s'\n", p);
1404 }
1405 }
1406
1407 if (!sloppy && invalid_option)
1408 return 0;
1409
1410 /*
1411 * verify that any proto=/mountproto= options match the address
1412 * familiies in the addr=/mountaddr= options.
1413 */
1414 if (protofamily != AF_UNSPEC &&
1415 protofamily != mnt->nfs_server.address.ss_family)
1416 goto out_proto_mismatch;
1417
1418 if (mountfamily != AF_UNSPEC) {
1419 if (mnt->mount_server.addrlen) {
1420 if (mountfamily != mnt->mount_server.address.ss_family)
1421 goto out_mountproto_mismatch;
1422 } else {
1423 if (mountfamily != mnt->nfs_server.address.ss_family)
1424 goto out_mountproto_mismatch;
1425 }
1426 }
1427
1428 return 1;
1429
1430 out_mountproto_mismatch:
1431 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1432 "option\n");
1433 return 0;
1434 out_proto_mismatch:
1435 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1436 return 0;
1437 out_invalid_address:
1438 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1439 return 0;
1440 out_invalid_value:
1441 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1442 return 0;
1443 out_nomem:
1444 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1445 return 0;
1446 out_security_failure:
1447 free_secdata(secdata);
1448 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1449 return 0;
1450 }
1451
1452 /*
1453 * Match the requested auth flavors with the list returned by
1454 * the server. Returns zero and sets the mount's authentication
1455 * flavor on success; returns -EACCES if server does not support
1456 * the requested flavor.
1457 */
1458 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1459 struct nfs_mount_request *request)
1460 {
1461 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1462
1463 /*
1464 * Certain releases of Linux's mountd return an empty
1465 * flavor list. To prevent behavioral regression with
1466 * these servers (ie. rejecting mounts that used to
1467 * succeed), revert to pre-2.6.32 behavior (no checking)
1468 * if the returned flavor list is empty.
1469 */
1470 if (server_authlist_len == 0)
1471 return 0;
1472
1473 /*
1474 * We avoid sophisticated negotiating here, as there are
1475 * plenty of cases where we can get it wrong, providing
1476 * either too little or too much security.
1477 *
1478 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1479 * flavor listed first. However, some servers list
1480 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1481 * preferred default, in args->auth_flavors[0] if user
1482 * didn't specify sec= mount option.
1483 */
1484 for (i = 0; i < args->auth_flavor_len; i++)
1485 for (j = 0; j < server_authlist_len; j++)
1486 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1487 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1488 request->auth_flavs[j]);
1489 args->auth_flavors[0] = request->auth_flavs[j];
1490 return 0;
1491 }
1492
1493 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1494 nfs_umount(request);
1495 return -EACCES;
1496 }
1497
1498 /*
1499 * Use the remote server's MOUNT service to request the NFS file handle
1500 * corresponding to the provided path.
1501 */
1502 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1503 struct nfs_fh *root_fh)
1504 {
1505 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1506 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1507 struct nfs_mount_request request = {
1508 .sap = (struct sockaddr *)
1509 &args->mount_server.address,
1510 .dirpath = args->nfs_server.export_path,
1511 .protocol = args->mount_server.protocol,
1512 .fh = root_fh,
1513 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1514 .auth_flav_len = &server_authlist_len,
1515 .auth_flavs = server_authlist,
1516 };
1517 int status;
1518
1519 if (args->mount_server.version == 0) {
1520 switch (args->version) {
1521 default:
1522 args->mount_server.version = NFS_MNT3_VERSION;
1523 break;
1524 case 2:
1525 args->mount_server.version = NFS_MNT_VERSION;
1526 }
1527 }
1528 request.version = args->mount_server.version;
1529
1530 if (args->mount_server.hostname)
1531 request.hostname = args->mount_server.hostname;
1532 else
1533 request.hostname = args->nfs_server.hostname;
1534
1535 /*
1536 * Construct the mount server's address.
1537 */
1538 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1539 memcpy(request.sap, &args->nfs_server.address,
1540 args->nfs_server.addrlen);
1541 args->mount_server.addrlen = args->nfs_server.addrlen;
1542 }
1543 request.salen = args->mount_server.addrlen;
1544 nfs_set_port(request.sap, &args->mount_server.port, 0);
1545
1546 /*
1547 * Now ask the mount server to map our export path
1548 * to a file handle.
1549 */
1550 status = nfs_mount(&request);
1551 if (status != 0) {
1552 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1553 request.hostname, status);
1554 return status;
1555 }
1556
1557 /*
1558 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1559 */
1560 if (args->mount_server.version != NFS_MNT3_VERSION)
1561 return 0;
1562 return nfs_walk_authlist(args, &request);
1563 }
1564
1565 static int nfs_parse_simple_hostname(const char *dev_name,
1566 char **hostname, size_t maxnamlen,
1567 char **export_path, size_t maxpathlen)
1568 {
1569 size_t len;
1570 char *colon, *comma;
1571
1572 colon = strchr(dev_name, ':');
1573 if (colon == NULL)
1574 goto out_bad_devname;
1575
1576 len = colon - dev_name;
1577 if (len > maxnamlen)
1578 goto out_hostname;
1579
1580 /* N.B. caller will free nfs_server.hostname in all cases */
1581 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1582 if (!*hostname)
1583 goto out_nomem;
1584
1585 /* kill possible hostname list: not supported */
1586 comma = strchr(*hostname, ',');
1587 if (comma != NULL) {
1588 if (comma == *hostname)
1589 goto out_bad_devname;
1590 *comma = '\0';
1591 }
1592
1593 colon++;
1594 len = strlen(colon);
1595 if (len > maxpathlen)
1596 goto out_path;
1597 *export_path = kstrndup(colon, len, GFP_KERNEL);
1598 if (!*export_path)
1599 goto out_nomem;
1600
1601 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1602 return 0;
1603
1604 out_bad_devname:
1605 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1606 return -EINVAL;
1607
1608 out_nomem:
1609 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1610 return -ENOMEM;
1611
1612 out_hostname:
1613 dfprintk(MOUNT, "NFS: server hostname too long\n");
1614 return -ENAMETOOLONG;
1615
1616 out_path:
1617 dfprintk(MOUNT, "NFS: export pathname too long\n");
1618 return -ENAMETOOLONG;
1619 }
1620
1621 /*
1622 * Hostname has square brackets around it because it contains one or
1623 * more colons. We look for the first closing square bracket, and a
1624 * colon must follow it.
1625 */
1626 static int nfs_parse_protected_hostname(const char *dev_name,
1627 char **hostname, size_t maxnamlen,
1628 char **export_path, size_t maxpathlen)
1629 {
1630 size_t len;
1631 char *start, *end;
1632
1633 start = (char *)(dev_name + 1);
1634
1635 end = strchr(start, ']');
1636 if (end == NULL)
1637 goto out_bad_devname;
1638 if (*(end + 1) != ':')
1639 goto out_bad_devname;
1640
1641 len = end - start;
1642 if (len > maxnamlen)
1643 goto out_hostname;
1644
1645 /* N.B. caller will free nfs_server.hostname in all cases */
1646 *hostname = kstrndup(start, len, GFP_KERNEL);
1647 if (*hostname == NULL)
1648 goto out_nomem;
1649
1650 end += 2;
1651 len = strlen(end);
1652 if (len > maxpathlen)
1653 goto out_path;
1654 *export_path = kstrndup(end, len, GFP_KERNEL);
1655 if (!*export_path)
1656 goto out_nomem;
1657
1658 return 0;
1659
1660 out_bad_devname:
1661 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1662 return -EINVAL;
1663
1664 out_nomem:
1665 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1666 return -ENOMEM;
1667
1668 out_hostname:
1669 dfprintk(MOUNT, "NFS: server hostname too long\n");
1670 return -ENAMETOOLONG;
1671
1672 out_path:
1673 dfprintk(MOUNT, "NFS: export pathname too long\n");
1674 return -ENAMETOOLONG;
1675 }
1676
1677 /*
1678 * Split "dev_name" into "hostname:export_path".
1679 *
1680 * The leftmost colon demarks the split between the server's hostname
1681 * and the export path. If the hostname starts with a left square
1682 * bracket, then it may contain colons.
1683 *
1684 * Note: caller frees hostname and export path, even on error.
1685 */
1686 static int nfs_parse_devname(const char *dev_name,
1687 char **hostname, size_t maxnamlen,
1688 char **export_path, size_t maxpathlen)
1689 {
1690 if (*dev_name == '[')
1691 return nfs_parse_protected_hostname(dev_name,
1692 hostname, maxnamlen,
1693 export_path, maxpathlen);
1694
1695 return nfs_parse_simple_hostname(dev_name,
1696 hostname, maxnamlen,
1697 export_path, maxpathlen);
1698 }
1699
1700 /*
1701 * Validate the NFS2/NFS3 mount data
1702 * - fills in the mount root filehandle
1703 *
1704 * For option strings, user space handles the following behaviors:
1705 *
1706 * + DNS: mapping server host name to IP address ("addr=" option)
1707 *
1708 * + failure mode: how to behave if a mount request can't be handled
1709 * immediately ("fg/bg" option)
1710 *
1711 * + retry: how often to retry a mount request ("retry=" option)
1712 *
1713 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1714 * mountproto=tcp after mountproto=udp, and so on
1715 */
1716 static int nfs_validate_mount_data(void *options,
1717 struct nfs_parsed_mount_data *args,
1718 struct nfs_fh *mntfh,
1719 const char *dev_name)
1720 {
1721 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1722 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1723
1724 if (data == NULL)
1725 goto out_no_data;
1726
1727 switch (data->version) {
1728 case 1:
1729 data->namlen = 0;
1730 case 2:
1731 data->bsize = 0;
1732 case 3:
1733 if (data->flags & NFS_MOUNT_VER3)
1734 goto out_no_v3;
1735 data->root.size = NFS2_FHSIZE;
1736 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1737 case 4:
1738 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1739 goto out_no_sec;
1740 case 5:
1741 memset(data->context, 0, sizeof(data->context));
1742 case 6:
1743 if (data->flags & NFS_MOUNT_VER3) {
1744 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1745 goto out_invalid_fh;
1746 mntfh->size = data->root.size;
1747 args->version = 3;
1748 } else {
1749 mntfh->size = NFS2_FHSIZE;
1750 args->version = 2;
1751 }
1752
1753
1754 memcpy(mntfh->data, data->root.data, mntfh->size);
1755 if (mntfh->size < sizeof(mntfh->data))
1756 memset(mntfh->data + mntfh->size, 0,
1757 sizeof(mntfh->data) - mntfh->size);
1758
1759 /*
1760 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1761 * can deal with.
1762 */
1763 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1764 args->rsize = data->rsize;
1765 args->wsize = data->wsize;
1766 args->timeo = data->timeo;
1767 args->retrans = data->retrans;
1768 args->acregmin = data->acregmin;
1769 args->acregmax = data->acregmax;
1770 args->acdirmin = data->acdirmin;
1771 args->acdirmax = data->acdirmax;
1772
1773 memcpy(sap, &data->addr, sizeof(data->addr));
1774 args->nfs_server.addrlen = sizeof(data->addr);
1775 if (!nfs_verify_server_address(sap))
1776 goto out_no_address;
1777
1778 if (!(data->flags & NFS_MOUNT_TCP))
1779 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1780 /* N.B. caller will free nfs_server.hostname in all cases */
1781 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1782 args->namlen = data->namlen;
1783 args->bsize = data->bsize;
1784
1785 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1786 args->auth_flavors[0] = data->pseudoflavor;
1787 if (!args->nfs_server.hostname)
1788 goto out_nomem;
1789
1790 /*
1791 * The legacy version 6 binary mount data from userspace has a
1792 * field used only to transport selinux information into the
1793 * the kernel. To continue to support that functionality we
1794 * have a touch of selinux knowledge here in the NFS code. The
1795 * userspace code converted context=blah to just blah so we are
1796 * converting back to the full string selinux understands.
1797 */
1798 if (data->context[0]){
1799 #ifdef CONFIG_SECURITY_SELINUX
1800 int rc;
1801 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1802 if (!opts_str)
1803 return -ENOMEM;
1804 strcpy(opts_str, "context=");
1805 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1806 strcat(opts_str, &data->context[0]);
1807 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1808 kfree(opts_str);
1809 if (rc)
1810 return rc;
1811 #else
1812 return -EINVAL;
1813 #endif
1814 }
1815
1816 break;
1817 default: {
1818 int status;
1819
1820 if (nfs_parse_mount_options((char *)options, args) == 0)
1821 return -EINVAL;
1822
1823 if (!nfs_verify_server_address(sap))
1824 goto out_no_address;
1825
1826 if (args->version == 4)
1827 #ifdef CONFIG_NFS_V4
1828 return nfs4_validate_text_mount_data(options,
1829 args, dev_name);
1830 #else
1831 goto out_v4_not_compiled;
1832 #endif
1833
1834 nfs_set_port(sap, &args->nfs_server.port, 0);
1835
1836 nfs_set_mount_transport_protocol(args);
1837
1838 status = nfs_parse_devname(dev_name,
1839 &args->nfs_server.hostname,
1840 PAGE_SIZE,
1841 &args->nfs_server.export_path,
1842 NFS_MAXPATHLEN);
1843 if (!status)
1844 status = nfs_try_mount(args, mntfh);
1845
1846 kfree(args->nfs_server.export_path);
1847 args->nfs_server.export_path = NULL;
1848
1849 if (status)
1850 return status;
1851
1852 break;
1853 }
1854 }
1855
1856 #ifndef CONFIG_NFS_V3
1857 if (args->version == 3)
1858 goto out_v3_not_compiled;
1859 #endif /* !CONFIG_NFS_V3 */
1860
1861 return 0;
1862
1863 out_no_data:
1864 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1865 return -EINVAL;
1866
1867 out_no_v3:
1868 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1869 data->version);
1870 return -EINVAL;
1871
1872 out_no_sec:
1873 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1874 return -EINVAL;
1875
1876 #ifndef CONFIG_NFS_V3
1877 out_v3_not_compiled:
1878 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1879 return -EPROTONOSUPPORT;
1880 #endif /* !CONFIG_NFS_V3 */
1881
1882 #ifndef CONFIG_NFS_V4
1883 out_v4_not_compiled:
1884 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1885 return -EPROTONOSUPPORT;
1886 #endif /* !CONFIG_NFS_V4 */
1887
1888 out_nomem:
1889 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1890 return -ENOMEM;
1891
1892 out_no_address:
1893 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1894 return -EINVAL;
1895
1896 out_invalid_fh:
1897 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1898 return -EINVAL;
1899 }
1900
1901 static int
1902 nfs_compare_remount_data(struct nfs_server *nfss,
1903 struct nfs_parsed_mount_data *data)
1904 {
1905 if (data->flags != nfss->flags ||
1906 data->rsize != nfss->rsize ||
1907 data->wsize != nfss->wsize ||
1908 data->retrans != nfss->client->cl_timeout->to_retries ||
1909 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1910 data->acregmin != nfss->acregmin / HZ ||
1911 data->acregmax != nfss->acregmax / HZ ||
1912 data->acdirmin != nfss->acdirmin / HZ ||
1913 data->acdirmax != nfss->acdirmax / HZ ||
1914 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1915 data->nfs_server.port != nfss->port ||
1916 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1917 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1918 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1919 return -EINVAL;
1920
1921 return 0;
1922 }
1923
1924 static int
1925 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1926 {
1927 int error;
1928 struct nfs_server *nfss = sb->s_fs_info;
1929 struct nfs_parsed_mount_data *data;
1930 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1931 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1932 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1933
1934 /*
1935 * Userspace mount programs that send binary options generally send
1936 * them populated with default values. We have no way to know which
1937 * ones were explicitly specified. Fall back to legacy behavior and
1938 * just return success.
1939 */
1940 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1941 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1942 options->version <= 6))))
1943 return 0;
1944
1945 data = kzalloc(sizeof(*data), GFP_KERNEL);
1946 if (data == NULL)
1947 return -ENOMEM;
1948
1949 /* fill out struct with values from existing mount */
1950 data->flags = nfss->flags;
1951 data->rsize = nfss->rsize;
1952 data->wsize = nfss->wsize;
1953 data->retrans = nfss->client->cl_timeout->to_retries;
1954 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1955 data->acregmin = nfss->acregmin / HZ;
1956 data->acregmax = nfss->acregmax / HZ;
1957 data->acdirmin = nfss->acdirmin / HZ;
1958 data->acdirmax = nfss->acdirmax / HZ;
1959 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1960 data->nfs_server.port = nfss->port;
1961 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1962 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1963 data->nfs_server.addrlen);
1964
1965 /* overwrite those values with any that were specified */
1966 error = nfs_parse_mount_options((char *)options, data);
1967 if (error < 0)
1968 goto out;
1969
1970 /* compare new mount options with old ones */
1971 error = nfs_compare_remount_data(nfss, data);
1972 out:
1973 kfree(data);
1974 return error;
1975 }
1976
1977 /*
1978 * Initialise the common bits of the superblock
1979 */
1980 static inline void nfs_initialise_sb(struct super_block *sb)
1981 {
1982 struct nfs_server *server = NFS_SB(sb);
1983
1984 sb->s_magic = NFS_SUPER_MAGIC;
1985
1986 /* We probably want something more informative here */
1987 snprintf(sb->s_id, sizeof(sb->s_id),
1988 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1989
1990 if (sb->s_blocksize == 0)
1991 sb->s_blocksize = nfs_block_bits(server->wsize,
1992 &sb->s_blocksize_bits);
1993
1994 if (server->flags & NFS_MOUNT_NOAC)
1995 sb->s_flags |= MS_SYNCHRONOUS;
1996
1997 sb->s_bdi = &server->backing_dev_info;
1998
1999 nfs_super_set_maxbytes(sb, server->maxfilesize);
2000 }
2001
2002 /*
2003 * Finish setting up an NFS2/3 superblock
2004 */
2005 static void nfs_fill_super(struct super_block *sb,
2006 struct nfs_parsed_mount_data *data)
2007 {
2008 struct nfs_server *server = NFS_SB(sb);
2009
2010 sb->s_blocksize_bits = 0;
2011 sb->s_blocksize = 0;
2012 if (data->bsize)
2013 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2014
2015 if (server->nfs_client->rpc_ops->version == 3) {
2016 /* The VFS shouldn't apply the umask to mode bits. We will do
2017 * so ourselves when necessary.
2018 */
2019 sb->s_flags |= MS_POSIXACL;
2020 sb->s_time_gran = 1;
2021 }
2022
2023 sb->s_op = &nfs_sops;
2024 nfs_initialise_sb(sb);
2025 }
2026
2027 /*
2028 * Finish setting up a cloned NFS2/3 superblock
2029 */
2030 static void nfs_clone_super(struct super_block *sb,
2031 const struct super_block *old_sb)
2032 {
2033 struct nfs_server *server = NFS_SB(sb);
2034
2035 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2036 sb->s_blocksize = old_sb->s_blocksize;
2037 sb->s_maxbytes = old_sb->s_maxbytes;
2038
2039 if (server->nfs_client->rpc_ops->version == 3) {
2040 /* The VFS shouldn't apply the umask to mode bits. We will do
2041 * so ourselves when necessary.
2042 */
2043 sb->s_flags |= MS_POSIXACL;
2044 sb->s_time_gran = 1;
2045 }
2046
2047 sb->s_op = old_sb->s_op;
2048 nfs_initialise_sb(sb);
2049 }
2050
2051 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2052 {
2053 const struct nfs_server *a = s->s_fs_info;
2054 const struct rpc_clnt *clnt_a = a->client;
2055 const struct rpc_clnt *clnt_b = b->client;
2056
2057 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2058 goto Ebusy;
2059 if (a->nfs_client != b->nfs_client)
2060 goto Ebusy;
2061 if (a->flags != b->flags)
2062 goto Ebusy;
2063 if (a->wsize != b->wsize)
2064 goto Ebusy;
2065 if (a->rsize != b->rsize)
2066 goto Ebusy;
2067 if (a->acregmin != b->acregmin)
2068 goto Ebusy;
2069 if (a->acregmax != b->acregmax)
2070 goto Ebusy;
2071 if (a->acdirmin != b->acdirmin)
2072 goto Ebusy;
2073 if (a->acdirmax != b->acdirmax)
2074 goto Ebusy;
2075 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2076 goto Ebusy;
2077 return 1;
2078 Ebusy:
2079 return 0;
2080 }
2081
2082 struct nfs_sb_mountdata {
2083 struct nfs_server *server;
2084 int mntflags;
2085 };
2086
2087 static int nfs_set_super(struct super_block *s, void *data)
2088 {
2089 struct nfs_sb_mountdata *sb_mntdata = data;
2090 struct nfs_server *server = sb_mntdata->server;
2091 int ret;
2092
2093 s->s_flags = sb_mntdata->mntflags;
2094 s->s_fs_info = server;
2095 ret = set_anon_super(s, server);
2096 if (ret == 0)
2097 server->s_dev = s->s_dev;
2098 return ret;
2099 }
2100
2101 static int nfs_compare_super_address(struct nfs_server *server1,
2102 struct nfs_server *server2)
2103 {
2104 struct sockaddr *sap1, *sap2;
2105
2106 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2107 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2108
2109 if (sap1->sa_family != sap2->sa_family)
2110 return 0;
2111
2112 switch (sap1->sa_family) {
2113 case AF_INET: {
2114 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2115 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2116 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2117 return 0;
2118 if (sin1->sin_port != sin2->sin_port)
2119 return 0;
2120 break;
2121 }
2122 case AF_INET6: {
2123 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2124 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2125 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2126 return 0;
2127 if (sin1->sin6_port != sin2->sin6_port)
2128 return 0;
2129 break;
2130 }
2131 default:
2132 return 0;
2133 }
2134
2135 return 1;
2136 }
2137
2138 static int nfs_compare_super(struct super_block *sb, void *data)
2139 {
2140 struct nfs_sb_mountdata *sb_mntdata = data;
2141 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2142 int mntflags = sb_mntdata->mntflags;
2143
2144 if (!nfs_compare_super_address(old, server))
2145 return 0;
2146 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2147 if (old->flags & NFS_MOUNT_UNSHARED)
2148 return 0;
2149 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2150 return 0;
2151 return nfs_compare_mount_options(sb, server, mntflags);
2152 }
2153
2154 static int nfs_bdi_register(struct nfs_server *server)
2155 {
2156 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2157 }
2158
2159 static int nfs_get_sb(struct file_system_type *fs_type,
2160 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2161 {
2162 struct nfs_server *server = NULL;
2163 struct super_block *s;
2164 struct nfs_parsed_mount_data *data;
2165 struct nfs_fh *mntfh;
2166 struct dentry *mntroot;
2167 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2168 struct nfs_sb_mountdata sb_mntdata = {
2169 .mntflags = flags,
2170 };
2171 int error = -ENOMEM;
2172
2173 data = nfs_alloc_parsed_mount_data(3);
2174 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2175 if (data == NULL || mntfh == NULL)
2176 goto out_free_fh;
2177
2178 security_init_mnt_opts(&data->lsm_opts);
2179
2180 /* Validate the mount data */
2181 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2182 if (error < 0)
2183 goto out;
2184
2185 #ifdef CONFIG_NFS_V4
2186 if (data->version == 4) {
2187 error = nfs4_try_mount(flags, dev_name, data, mnt);
2188 kfree(data->client_address);
2189 goto out;
2190 }
2191 #endif /* CONFIG_NFS_V4 */
2192
2193 /* Get a volume representation */
2194 server = nfs_create_server(data, mntfh);
2195 if (IS_ERR(server)) {
2196 error = PTR_ERR(server);
2197 goto out;
2198 }
2199 sb_mntdata.server = server;
2200
2201 if (server->flags & NFS_MOUNT_UNSHARED)
2202 compare_super = NULL;
2203
2204 /* Get a superblock - note that we may end up sharing one that already exists */
2205 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2206 if (IS_ERR(s)) {
2207 error = PTR_ERR(s);
2208 goto out_err_nosb;
2209 }
2210
2211 if (s->s_fs_info != server) {
2212 nfs_free_server(server);
2213 server = NULL;
2214 } else {
2215 error = nfs_bdi_register(server);
2216 if (error)
2217 goto error_splat_bdi;
2218 }
2219
2220 if (!s->s_root) {
2221 /* initial superblock/root creation */
2222 nfs_fill_super(s, data);
2223 nfs_fscache_get_super_cookie(
2224 s, data ? data->fscache_uniq : NULL, NULL);
2225 }
2226
2227 mntroot = nfs_get_root(s, mntfh);
2228 if (IS_ERR(mntroot)) {
2229 error = PTR_ERR(mntroot);
2230 goto error_splat_super;
2231 }
2232
2233 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2234 if (error)
2235 goto error_splat_root;
2236
2237 s->s_flags |= MS_ACTIVE;
2238 mnt->mnt_sb = s;
2239 mnt->mnt_root = mntroot;
2240 error = 0;
2241
2242 out:
2243 kfree(data->nfs_server.hostname);
2244 kfree(data->mount_server.hostname);
2245 kfree(data->fscache_uniq);
2246 security_free_mnt_opts(&data->lsm_opts);
2247 out_free_fh:
2248 kfree(mntfh);
2249 kfree(data);
2250 return error;
2251
2252 out_err_nosb:
2253 nfs_free_server(server);
2254 goto out;
2255
2256 error_splat_root:
2257 dput(mntroot);
2258 error_splat_super:
2259 if (server && !s->s_root)
2260 bdi_unregister(&server->backing_dev_info);
2261 error_splat_bdi:
2262 deactivate_locked_super(s);
2263 goto out;
2264 }
2265
2266 /*
2267 * Ensure that we unregister the bdi before kill_anon_super
2268 * releases the device name
2269 */
2270 static void nfs_put_super(struct super_block *s)
2271 {
2272 struct nfs_server *server = NFS_SB(s);
2273
2274 bdi_unregister(&server->backing_dev_info);
2275 }
2276
2277 /*
2278 * Destroy an NFS2/3 superblock
2279 */
2280 static void nfs_kill_super(struct super_block *s)
2281 {
2282 struct nfs_server *server = NFS_SB(s);
2283
2284 kill_anon_super(s);
2285 nfs_fscache_release_super_cookie(s);
2286 nfs_free_server(server);
2287 }
2288
2289 /*
2290 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2291 */
2292 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2293 const char *dev_name, void *raw_data,
2294 struct vfsmount *mnt)
2295 {
2296 struct nfs_clone_mount *data = raw_data;
2297 struct super_block *s;
2298 struct nfs_server *server;
2299 struct dentry *mntroot;
2300 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2301 struct nfs_sb_mountdata sb_mntdata = {
2302 .mntflags = flags,
2303 };
2304 int error;
2305
2306 dprintk("--> nfs_xdev_get_sb()\n");
2307
2308 /* create a new volume representation */
2309 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2310 if (IS_ERR(server)) {
2311 error = PTR_ERR(server);
2312 goto out_err_noserver;
2313 }
2314 sb_mntdata.server = server;
2315
2316 if (server->flags & NFS_MOUNT_UNSHARED)
2317 compare_super = NULL;
2318
2319 /* Get a superblock - note that we may end up sharing one that already exists */
2320 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2321 if (IS_ERR(s)) {
2322 error = PTR_ERR(s);
2323 goto out_err_nosb;
2324 }
2325
2326 if (s->s_fs_info != server) {
2327 nfs_free_server(server);
2328 server = NULL;
2329 } else {
2330 error = nfs_bdi_register(server);
2331 if (error)
2332 goto error_splat_bdi;
2333 }
2334
2335 if (!s->s_root) {
2336 /* initial superblock/root creation */
2337 nfs_clone_super(s, data->sb);
2338 nfs_fscache_get_super_cookie(s, NULL, data);
2339 }
2340
2341 mntroot = nfs_get_root(s, data->fh);
2342 if (IS_ERR(mntroot)) {
2343 error = PTR_ERR(mntroot);
2344 goto error_splat_super;
2345 }
2346 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2347 dput(mntroot);
2348 error = -ESTALE;
2349 goto error_splat_super;
2350 }
2351
2352 s->s_flags |= MS_ACTIVE;
2353 mnt->mnt_sb = s;
2354 mnt->mnt_root = mntroot;
2355
2356 /* clone any lsm security options from the parent to the new sb */
2357 security_sb_clone_mnt_opts(data->sb, s);
2358
2359 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2360 return 0;
2361
2362 out_err_nosb:
2363 nfs_free_server(server);
2364 out_err_noserver:
2365 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2366 return error;
2367
2368 error_splat_super:
2369 if (server && !s->s_root)
2370 bdi_unregister(&server->backing_dev_info);
2371 error_splat_bdi:
2372 deactivate_locked_super(s);
2373 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2374 return error;
2375 }
2376
2377 #ifdef CONFIG_NFS_V4
2378
2379 /*
2380 * Finish setting up a cloned NFS4 superblock
2381 */
2382 static void nfs4_clone_super(struct super_block *sb,
2383 const struct super_block *old_sb)
2384 {
2385 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2386 sb->s_blocksize = old_sb->s_blocksize;
2387 sb->s_maxbytes = old_sb->s_maxbytes;
2388 sb->s_time_gran = 1;
2389 sb->s_op = old_sb->s_op;
2390 nfs_initialise_sb(sb);
2391 }
2392
2393 /*
2394 * Set up an NFS4 superblock
2395 */
2396 static void nfs4_fill_super(struct super_block *sb)
2397 {
2398 sb->s_time_gran = 1;
2399 sb->s_op = &nfs4_sops;
2400 nfs_initialise_sb(sb);
2401 }
2402
2403 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2404 {
2405 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2406 }
2407
2408 static int nfs4_validate_text_mount_data(void *options,
2409 struct nfs_parsed_mount_data *args,
2410 const char *dev_name)
2411 {
2412 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2413
2414 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2415
2416 nfs_validate_transport_protocol(args);
2417
2418 nfs4_validate_mount_flags(args);
2419
2420 if (args->version != 4) {
2421 dfprintk(MOUNT,
2422 "NFS4: Illegal mount version\n");
2423 return -EINVAL;
2424 }
2425
2426 if (args->auth_flavor_len > 1) {
2427 dfprintk(MOUNT,
2428 "NFS4: Too many RPC auth flavours specified\n");
2429 return -EINVAL;
2430 }
2431
2432 if (args->client_address == NULL) {
2433 dfprintk(MOUNT,
2434 "NFS4: mount program didn't pass callback address\n");
2435 return -EINVAL;
2436 }
2437
2438 return nfs_parse_devname(dev_name,
2439 &args->nfs_server.hostname,
2440 NFS4_MAXNAMLEN,
2441 &args->nfs_server.export_path,
2442 NFS4_MAXPATHLEN);
2443 }
2444
2445 /*
2446 * Validate NFSv4 mount options
2447 */
2448 static int nfs4_validate_mount_data(void *options,
2449 struct nfs_parsed_mount_data *args,
2450 const char *dev_name)
2451 {
2452 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2453 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2454 char *c;
2455
2456 if (data == NULL)
2457 goto out_no_data;
2458
2459 switch (data->version) {
2460 case 1:
2461 if (data->host_addrlen > sizeof(args->nfs_server.address))
2462 goto out_no_address;
2463 if (data->host_addrlen == 0)
2464 goto out_no_address;
2465 args->nfs_server.addrlen = data->host_addrlen;
2466 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2467 return -EFAULT;
2468 if (!nfs_verify_server_address(sap))
2469 goto out_no_address;
2470
2471 if (data->auth_flavourlen) {
2472 if (data->auth_flavourlen > 1)
2473 goto out_inval_auth;
2474 if (copy_from_user(&args->auth_flavors[0],
2475 data->auth_flavours,
2476 sizeof(args->auth_flavors[0])))
2477 return -EFAULT;
2478 }
2479
2480 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2481 if (IS_ERR(c))
2482 return PTR_ERR(c);
2483 args->nfs_server.hostname = c;
2484
2485 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2486 if (IS_ERR(c))
2487 return PTR_ERR(c);
2488 args->nfs_server.export_path = c;
2489 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2490
2491 c = strndup_user(data->client_addr.data, 16);
2492 if (IS_ERR(c))
2493 return PTR_ERR(c);
2494 args->client_address = c;
2495
2496 /*
2497 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2498 * can deal with.
2499 */
2500
2501 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2502 args->rsize = data->rsize;
2503 args->wsize = data->wsize;
2504 args->timeo = data->timeo;
2505 args->retrans = data->retrans;
2506 args->acregmin = data->acregmin;
2507 args->acregmax = data->acregmax;
2508 args->acdirmin = data->acdirmin;
2509 args->acdirmax = data->acdirmax;
2510 args->nfs_server.protocol = data->proto;
2511 nfs_validate_transport_protocol(args);
2512
2513 break;
2514 default:
2515 if (nfs_parse_mount_options((char *)options, args) == 0)
2516 return -EINVAL;
2517
2518 if (!nfs_verify_server_address(sap))
2519 return -EINVAL;
2520
2521 return nfs4_validate_text_mount_data(options, args, dev_name);
2522 }
2523
2524 return 0;
2525
2526 out_no_data:
2527 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2528 return -EINVAL;
2529
2530 out_inval_auth:
2531 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2532 data->auth_flavourlen);
2533 return -EINVAL;
2534
2535 out_no_address:
2536 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2537 return -EINVAL;
2538 }
2539
2540 /*
2541 * Get the superblock for the NFS4 root partition
2542 */
2543 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2544 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2545 {
2546 struct nfs_parsed_mount_data *data = raw_data;
2547 struct super_block *s;
2548 struct nfs_server *server;
2549 struct nfs_fh *mntfh;
2550 struct dentry *mntroot;
2551 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2552 struct nfs_sb_mountdata sb_mntdata = {
2553 .mntflags = flags,
2554 };
2555 int error = -ENOMEM;
2556
2557 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2558 if (data == NULL || mntfh == NULL)
2559 goto out_free_fh;
2560
2561 security_init_mnt_opts(&data->lsm_opts);
2562
2563 /* Get a volume representation */
2564 server = nfs4_create_server(data, mntfh);
2565 if (IS_ERR(server)) {
2566 error = PTR_ERR(server);
2567 goto out;
2568 }
2569 sb_mntdata.server = server;
2570
2571 if (server->flags & NFS4_MOUNT_UNSHARED)
2572 compare_super = NULL;
2573
2574 /* Get a superblock - note that we may end up sharing one that already exists */
2575 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2576 if (IS_ERR(s)) {
2577 error = PTR_ERR(s);
2578 goto out_free;
2579 }
2580
2581 if (s->s_fs_info != server) {
2582 nfs_free_server(server);
2583 server = NULL;
2584 } else {
2585 error = nfs_bdi_register(server);
2586 if (error)
2587 goto error_splat_bdi;
2588 }
2589
2590 if (!s->s_root) {
2591 /* initial superblock/root creation */
2592 nfs4_fill_super(s);
2593 nfs_fscache_get_super_cookie(
2594 s, data ? data->fscache_uniq : NULL, NULL);
2595 }
2596
2597 mntroot = nfs4_get_root(s, mntfh);
2598 if (IS_ERR(mntroot)) {
2599 error = PTR_ERR(mntroot);
2600 goto error_splat_super;
2601 }
2602
2603 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2604 if (error)
2605 goto error_splat_root;
2606
2607 s->s_flags |= MS_ACTIVE;
2608 mnt->mnt_sb = s;
2609 mnt->mnt_root = mntroot;
2610 error = 0;
2611
2612 out:
2613 security_free_mnt_opts(&data->lsm_opts);
2614 out_free_fh:
2615 kfree(mntfh);
2616 return error;
2617
2618 out_free:
2619 nfs_free_server(server);
2620 goto out;
2621
2622 error_splat_root:
2623 dput(mntroot);
2624 error_splat_super:
2625 if (server && !s->s_root)
2626 bdi_unregister(&server->backing_dev_info);
2627 error_splat_bdi:
2628 deactivate_locked_super(s);
2629 goto out;
2630 }
2631
2632 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2633 int flags, void *data, const char *hostname)
2634 {
2635 struct vfsmount *root_mnt;
2636 char *root_devname;
2637 size_t len;
2638
2639 len = strlen(hostname) + 3;
2640 root_devname = kmalloc(len, GFP_KERNEL);
2641 if (root_devname == NULL)
2642 return ERR_PTR(-ENOMEM);
2643 snprintf(root_devname, len, "%s:/", hostname);
2644 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2645 kfree(root_devname);
2646 return root_mnt;
2647 }
2648
2649 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2650 {
2651 char *page = (char *) __get_free_page(GFP_KERNEL);
2652 char *devname, *tmp;
2653
2654 if (page == NULL)
2655 return;
2656 devname = nfs_path(path->mnt->mnt_devname,
2657 path->mnt->mnt_root, path->dentry,
2658 page, PAGE_SIZE);
2659 if (devname == NULL)
2660 goto out_freepage;
2661 tmp = kstrdup(devname, GFP_KERNEL);
2662 if (tmp == NULL)
2663 goto out_freepage;
2664 kfree(mnt->mnt_devname);
2665 mnt->mnt_devname = tmp;
2666 out_freepage:
2667 free_page((unsigned long)page);
2668 }
2669
2670 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2671 const char *export_path, struct vfsmount *mnt_target)
2672 {
2673 struct mnt_namespace *ns_private;
2674 struct nameidata nd;
2675 struct super_block *s;
2676 int ret;
2677
2678 ns_private = create_mnt_ns(root_mnt);
2679 ret = PTR_ERR(ns_private);
2680 if (IS_ERR(ns_private))
2681 goto out_mntput;
2682
2683 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2684 export_path, LOOKUP_FOLLOW, &nd);
2685
2686 put_mnt_ns(ns_private);
2687
2688 if (ret != 0)
2689 goto out_err;
2690
2691 s = nd.path.mnt->mnt_sb;
2692 atomic_inc(&s->s_active);
2693 mnt_target->mnt_sb = s;
2694 mnt_target->mnt_root = dget(nd.path.dentry);
2695
2696 /* Correct the device pathname */
2697 nfs_fix_devname(&nd.path, mnt_target);
2698
2699 path_put(&nd.path);
2700 down_write(&s->s_umount);
2701 return 0;
2702 out_mntput:
2703 mntput(root_mnt);
2704 out_err:
2705 return ret;
2706 }
2707
2708 static int nfs4_try_mount(int flags, const char *dev_name,
2709 struct nfs_parsed_mount_data *data,
2710 struct vfsmount *mnt)
2711 {
2712 char *export_path;
2713 struct vfsmount *root_mnt;
2714 int error;
2715
2716 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2717
2718 export_path = data->nfs_server.export_path;
2719 data->nfs_server.export_path = "/";
2720 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2721 data->nfs_server.hostname);
2722 data->nfs_server.export_path = export_path;
2723
2724 error = PTR_ERR(root_mnt);
2725 if (IS_ERR(root_mnt))
2726 goto out;
2727
2728 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2729
2730 out:
2731 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2732 error != 0 ? " [error]" : "");
2733 return error;
2734 }
2735
2736 /*
2737 * Get the superblock for an NFS4 mountpoint
2738 */
2739 static int nfs4_get_sb(struct file_system_type *fs_type,
2740 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2741 {
2742 struct nfs_parsed_mount_data *data;
2743 int error = -ENOMEM;
2744
2745 data = nfs_alloc_parsed_mount_data(4);
2746 if (data == NULL)
2747 goto out_free_data;
2748
2749 /* Validate the mount data */
2750 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2751 if (error < 0)
2752 goto out;
2753
2754 error = nfs4_try_mount(flags, dev_name, data, mnt);
2755
2756 out:
2757 kfree(data->client_address);
2758 kfree(data->nfs_server.export_path);
2759 kfree(data->nfs_server.hostname);
2760 kfree(data->fscache_uniq);
2761 out_free_data:
2762 kfree(data);
2763 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2764 error != 0 ? " [error]" : "");
2765 return error;
2766 }
2767
2768 static void nfs4_kill_super(struct super_block *sb)
2769 {
2770 struct nfs_server *server = NFS_SB(sb);
2771
2772 dprintk("--> %s\n", __func__);
2773 nfs_super_return_all_delegations(sb);
2774 kill_anon_super(sb);
2775 nfs_fscache_release_super_cookie(sb);
2776 nfs_free_server(server);
2777 dprintk("<-- %s\n", __func__);
2778 }
2779
2780 /*
2781 * Clone an NFS4 server record on xdev traversal (FSID-change)
2782 */
2783 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2784 const char *dev_name, void *raw_data,
2785 struct vfsmount *mnt)
2786 {
2787 struct nfs_clone_mount *data = raw_data;
2788 struct super_block *s;
2789 struct nfs_server *server;
2790 struct dentry *mntroot;
2791 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2792 struct nfs_sb_mountdata sb_mntdata = {
2793 .mntflags = flags,
2794 };
2795 int error;
2796
2797 dprintk("--> nfs4_xdev_get_sb()\n");
2798
2799 /* create a new volume representation */
2800 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2801 if (IS_ERR(server)) {
2802 error = PTR_ERR(server);
2803 goto out_err_noserver;
2804 }
2805 sb_mntdata.server = server;
2806
2807 if (server->flags & NFS4_MOUNT_UNSHARED)
2808 compare_super = NULL;
2809
2810 /* Get a superblock - note that we may end up sharing one that already exists */
2811 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2812 if (IS_ERR(s)) {
2813 error = PTR_ERR(s);
2814 goto out_err_nosb;
2815 }
2816
2817 if (s->s_fs_info != server) {
2818 nfs_free_server(server);
2819 server = NULL;
2820 } else {
2821 error = nfs_bdi_register(server);
2822 if (error)
2823 goto error_splat_bdi;
2824 }
2825
2826 if (!s->s_root) {
2827 /* initial superblock/root creation */
2828 nfs4_clone_super(s, data->sb);
2829 nfs_fscache_get_super_cookie(s, NULL, data);
2830 }
2831
2832 mntroot = nfs4_get_root(s, data->fh);
2833 if (IS_ERR(mntroot)) {
2834 error = PTR_ERR(mntroot);
2835 goto error_splat_super;
2836 }
2837 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2838 dput(mntroot);
2839 error = -ESTALE;
2840 goto error_splat_super;
2841 }
2842
2843 s->s_flags |= MS_ACTIVE;
2844 mnt->mnt_sb = s;
2845 mnt->mnt_root = mntroot;
2846
2847 security_sb_clone_mnt_opts(data->sb, s);
2848
2849 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2850 return 0;
2851
2852 out_err_nosb:
2853 nfs_free_server(server);
2854 out_err_noserver:
2855 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2856 return error;
2857
2858 error_splat_super:
2859 if (server && !s->s_root)
2860 bdi_unregister(&server->backing_dev_info);
2861 error_splat_bdi:
2862 deactivate_locked_super(s);
2863 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2864 return error;
2865 }
2866
2867 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2868 int flags, const char *dev_name, void *raw_data,
2869 struct vfsmount *mnt)
2870 {
2871 struct nfs_clone_mount *data = raw_data;
2872 struct super_block *s;
2873 struct nfs_server *server;
2874 struct dentry *mntroot;
2875 struct nfs_fh mntfh;
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_referral_get_sb()\n");
2883
2884 /* create a new volume representation */
2885 server = nfs4_create_referral_server(data, &mntfh);
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_fill_super(s);
2914 nfs_fscache_get_super_cookie(s, NULL, data);
2915 }
2916
2917 mntroot = nfs4_get_root(s, &mntfh);
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_referral_get_sb() = 0\n");
2935 return 0;
2936
2937 out_err_nosb:
2938 nfs_free_server(server);
2939 out_err_noserver:
2940 dprintk("<-- nfs4_referral_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_referral_get_sb() = %d [splat]\n", error);
2949 return error;
2950 }
2951
2952 /*
2953 * Create an NFS4 server record on referral traversal
2954 */
2955 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2956 int flags, const char *dev_name, void *raw_data,
2957 struct vfsmount *mnt)
2958 {
2959 struct nfs_clone_mount *data = raw_data;
2960 char *export_path;
2961 struct vfsmount *root_mnt;
2962 int error;
2963
2964 dprintk("--> nfs4_referral_get_sb()\n");
2965
2966 export_path = data->mnt_path;
2967 data->mnt_path = "/";
2968
2969 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2970 flags, data, data->hostname);
2971 data->mnt_path = export_path;
2972
2973 error = PTR_ERR(root_mnt);
2974 if (IS_ERR(root_mnt))
2975 goto out;
2976
2977 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2978 out:
2979 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2980 error != 0 ? " [error]" : "");
2981 return error;
2982 }
2983
2984 #endif /* CONFIG_NFS_V4 */
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