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ath9k: Fix a warning due to a queued work during S3 state
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / super.c
blob2b8e9a5e366a67a7eb6ce228d14df6ed69f51fb9
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/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/mnt_namespace.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.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 #ifdef CONFIG_NFS_V3
70 #define NFS_DEFAULT_VERSION 3
71 #else
72 #define NFS_DEFAULT_VERSION 2
73 #endif
74
75 enum {
76 /* Mount options that take no arguments */
77 Opt_soft, Opt_hard,
78 Opt_posix, Opt_noposix,
79 Opt_cto, Opt_nocto,
80 Opt_ac, Opt_noac,
81 Opt_lock, Opt_nolock,
82 Opt_v2, Opt_v3, Opt_v4,
83 Opt_udp, Opt_tcp, Opt_rdma,
84 Opt_acl, Opt_noacl,
85 Opt_rdirplus, Opt_nordirplus,
86 Opt_sharecache, Opt_nosharecache,
87 Opt_resvport, Opt_noresvport,
88 Opt_fscache, Opt_nofscache,
89
90 /* Mount options that take integer arguments */
91 Opt_port,
92 Opt_rsize, Opt_wsize, Opt_bsize,
93 Opt_timeo, Opt_retrans,
94 Opt_acregmin, Opt_acregmax,
95 Opt_acdirmin, Opt_acdirmax,
96 Opt_actimeo,
97 Opt_namelen,
98 Opt_mountport,
99 Opt_mountvers,
100 Opt_nfsvers,
101 Opt_minorversion,
102
103 /* Mount options that take string arguments */
104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
105 Opt_addr, Opt_mountaddr, Opt_clientaddr,
106 Opt_lookupcache,
107 Opt_fscache_uniq,
108 Opt_local_lock,
109
110 /* Special mount options */
111 Opt_userspace, Opt_deprecated, Opt_sloppy,
112
113 Opt_err
114 };
115
116 static const match_table_t nfs_mount_option_tokens = {
117 { Opt_userspace, "bg" },
118 { Opt_userspace, "fg" },
119 { Opt_userspace, "retry=%s" },
120
121 { Opt_sloppy, "sloppy" },
122
123 { Opt_soft, "soft" },
124 { Opt_hard, "hard" },
125 { Opt_deprecated, "intr" },
126 { Opt_deprecated, "nointr" },
127 { Opt_posix, "posix" },
128 { Opt_noposix, "noposix" },
129 { Opt_cto, "cto" },
130 { Opt_nocto, "nocto" },
131 { Opt_ac, "ac" },
132 { Opt_noac, "noac" },
133 { Opt_lock, "lock" },
134 { Opt_nolock, "nolock" },
135 { Opt_v2, "v2" },
136 { Opt_v3, "v3" },
137 { Opt_v4, "v4" },
138 { Opt_udp, "udp" },
139 { Opt_tcp, "tcp" },
140 { Opt_rdma, "rdma" },
141 { Opt_acl, "acl" },
142 { Opt_noacl, "noacl" },
143 { Opt_rdirplus, "rdirplus" },
144 { Opt_nordirplus, "nordirplus" },
145 { Opt_sharecache, "sharecache" },
146 { Opt_nosharecache, "nosharecache" },
147 { Opt_resvport, "resvport" },
148 { Opt_noresvport, "noresvport" },
149 { Opt_fscache, "fsc" },
150 { Opt_nofscache, "nofsc" },
151
152 { Opt_port, "port=%s" },
153 { Opt_rsize, "rsize=%s" },
154 { Opt_wsize, "wsize=%s" },
155 { Opt_bsize, "bsize=%s" },
156 { Opt_timeo, "timeo=%s" },
157 { Opt_retrans, "retrans=%s" },
158 { Opt_acregmin, "acregmin=%s" },
159 { Opt_acregmax, "acregmax=%s" },
160 { Opt_acdirmin, "acdirmin=%s" },
161 { Opt_acdirmax, "acdirmax=%s" },
162 { Opt_actimeo, "actimeo=%s" },
163 { Opt_namelen, "namlen=%s" },
164 { Opt_mountport, "mountport=%s" },
165 { Opt_mountvers, "mountvers=%s" },
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
168 { Opt_minorversion, "minorversion=%s" },
169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
175 { Opt_mounthost, "mounthost=%s" },
176 { Opt_mountaddr, "mountaddr=%s" },
177
178 { Opt_lookupcache, "lookupcache=%s" },
179 { Opt_fscache_uniq, "fsc=%s" },
180 { Opt_local_lock, "local_lock=%s" },
181
182 { Opt_err, NULL }
183 };
184
185 enum {
186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
187
188 Opt_xprt_err
189 };
190
191 static const match_table_t nfs_xprt_protocol_tokens = {
192 { Opt_xprt_udp, "udp" },
193 { Opt_xprt_udp6, "udp6" },
194 { Opt_xprt_tcp, "tcp" },
195 { Opt_xprt_tcp6, "tcp6" },
196 { Opt_xprt_rdma, "rdma" },
197
198 { Opt_xprt_err, NULL }
199 };
200
201 enum {
202 Opt_sec_none, Opt_sec_sys,
203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
206
207 Opt_sec_err
208 };
209
210 static const match_table_t nfs_secflavor_tokens = {
211 { Opt_sec_none, "none" },
212 { Opt_sec_none, "null" },
213 { Opt_sec_sys, "sys" },
214
215 { Opt_sec_krb5, "krb5" },
216 { Opt_sec_krb5i, "krb5i" },
217 { Opt_sec_krb5p, "krb5p" },
218
219 { Opt_sec_lkey, "lkey" },
220 { Opt_sec_lkeyi, "lkeyi" },
221 { Opt_sec_lkeyp, "lkeyp" },
222
223 { Opt_sec_spkm, "spkm3" },
224 { Opt_sec_spkmi, "spkm3i" },
225 { Opt_sec_spkmp, "spkm3p" },
226
227 { Opt_sec_err, NULL }
228 };
229
230 enum {
231 Opt_lookupcache_all, Opt_lookupcache_positive,
232 Opt_lookupcache_none,
233
234 Opt_lookupcache_err
235 };
236
237 static match_table_t nfs_lookupcache_tokens = {
238 { Opt_lookupcache_all, "all" },
239 { Opt_lookupcache_positive, "pos" },
240 { Opt_lookupcache_positive, "positive" },
241 { Opt_lookupcache_none, "none" },
242
243 { Opt_lookupcache_err, NULL }
244 };
245
246 enum {
247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
248 Opt_local_lock_none,
249
250 Opt_local_lock_err
251 };
252
253 static match_table_t nfs_local_lock_tokens = {
254 { Opt_local_lock_all, "all" },
255 { Opt_local_lock_flock, "flock" },
256 { Opt_local_lock_posix, "posix" },
257 { Opt_local_lock_none, "none" },
258
259 { Opt_local_lock_err, NULL }
260 };
261
262
263 static void nfs_umount_begin(struct super_block *);
264 static int nfs_statfs(struct dentry *, struct kstatfs *);
265 static int nfs_show_options(struct seq_file *, struct vfsmount *);
266 static int nfs_show_devname(struct seq_file *, struct vfsmount *);
267 static int nfs_show_path(struct seq_file *, struct vfsmount *);
268 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
269 static struct dentry *nfs_fs_mount(struct file_system_type *,
270 int, const char *, void *);
271 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
272 int flags, const char *dev_name, void *raw_data);
273 static void nfs_put_super(struct super_block *);
274 static void nfs_kill_super(struct super_block *);
275 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
276
277 static struct file_system_type nfs_fs_type = {
278 .owner = THIS_MODULE,
279 .name = "nfs",
280 .mount = nfs_fs_mount,
281 .kill_sb = nfs_kill_super,
282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
283 };
284
285 struct file_system_type nfs_xdev_fs_type = {
286 .owner = THIS_MODULE,
287 .name = "nfs",
288 .mount = nfs_xdev_mount,
289 .kill_sb = nfs_kill_super,
290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
291 };
292
293 static const struct super_operations nfs_sops = {
294 .alloc_inode = nfs_alloc_inode,
295 .destroy_inode = nfs_destroy_inode,
296 .write_inode = nfs_write_inode,
297 .put_super = nfs_put_super,
298 .statfs = nfs_statfs,
299 .evict_inode = nfs_evict_inode,
300 .umount_begin = nfs_umount_begin,
301 .show_options = nfs_show_options,
302 .show_devname = nfs_show_devname,
303 .show_path = nfs_show_path,
304 .show_stats = nfs_show_stats,
305 .remount_fs = nfs_remount,
306 };
307
308 #ifdef CONFIG_NFS_V4
309 static int nfs4_validate_text_mount_data(void *options,
310 struct nfs_parsed_mount_data *args, const char *dev_name);
311 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
312 struct nfs_parsed_mount_data *data);
313 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
314 int flags, const char *dev_name, void *raw_data);
315 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
316 int flags, const char *dev_name, void *raw_data);
317 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *raw_data);
319 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
320 int flags, const char *dev_name, void *raw_data);
321 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
322 int flags, const char *dev_name, void *raw_data);
323 static void nfs4_kill_super(struct super_block *sb);
324
325 static struct file_system_type nfs4_fs_type = {
326 .owner = THIS_MODULE,
327 .name = "nfs4",
328 .mount = nfs4_mount,
329 .kill_sb = nfs4_kill_super,
330 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
331 };
332
333 static struct file_system_type nfs4_remote_fs_type = {
334 .owner = THIS_MODULE,
335 .name = "nfs4",
336 .mount = nfs4_remote_mount,
337 .kill_sb = nfs4_kill_super,
338 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
339 };
340
341 struct file_system_type nfs4_xdev_fs_type = {
342 .owner = THIS_MODULE,
343 .name = "nfs4",
344 .mount = nfs4_xdev_mount,
345 .kill_sb = nfs4_kill_super,
346 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
347 };
348
349 static struct file_system_type nfs4_remote_referral_fs_type = {
350 .owner = THIS_MODULE,
351 .name = "nfs4",
352 .mount = nfs4_remote_referral_mount,
353 .kill_sb = nfs4_kill_super,
354 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
355 };
356
357 struct file_system_type nfs4_referral_fs_type = {
358 .owner = THIS_MODULE,
359 .name = "nfs4",
360 .mount = nfs4_referral_mount,
361 .kill_sb = nfs4_kill_super,
362 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
363 };
364
365 static const struct super_operations nfs4_sops = {
366 .alloc_inode = nfs_alloc_inode,
367 .destroy_inode = nfs_destroy_inode,
368 .write_inode = nfs_write_inode,
369 .put_super = nfs_put_super,
370 .statfs = nfs_statfs,
371 .evict_inode = nfs4_evict_inode,
372 .umount_begin = nfs_umount_begin,
373 .show_options = nfs_show_options,
374 .show_devname = nfs_show_devname,
375 .show_path = nfs_show_path,
376 .show_stats = nfs_show_stats,
377 .remount_fs = nfs_remount,
378 };
379 #endif
380
381 static struct shrinker acl_shrinker = {
382 .shrink = nfs_access_cache_shrinker,
383 .seeks = DEFAULT_SEEKS,
384 };
385
386 /*
387 * Register the NFS filesystems
388 */
389 int __init register_nfs_fs(void)
390 {
391 int ret;
392
393 ret = register_filesystem(&nfs_fs_type);
394 if (ret < 0)
395 goto error_0;
396
397 ret = nfs_register_sysctl();
398 if (ret < 0)
399 goto error_1;
400 #ifdef CONFIG_NFS_V4
401 ret = register_filesystem(&nfs4_fs_type);
402 if (ret < 0)
403 goto error_2;
404 #endif
405 register_shrinker(&acl_shrinker);
406 return 0;
407
408 #ifdef CONFIG_NFS_V4
409 error_2:
410 nfs_unregister_sysctl();
411 #endif
412 error_1:
413 unregister_filesystem(&nfs_fs_type);
414 error_0:
415 return ret;
416 }
417
418 /*
419 * Unregister the NFS filesystems
420 */
421 void __exit unregister_nfs_fs(void)
422 {
423 unregister_shrinker(&acl_shrinker);
424 #ifdef CONFIG_NFS_V4
425 unregister_filesystem(&nfs4_fs_type);
426 #endif
427 nfs_unregister_sysctl();
428 unregister_filesystem(&nfs_fs_type);
429 }
430
431 void nfs_sb_active(struct super_block *sb)
432 {
433 struct nfs_server *server = NFS_SB(sb);
434
435 if (atomic_inc_return(&server->active) == 1)
436 atomic_inc(&sb->s_active);
437 }
438
439 void nfs_sb_deactive(struct super_block *sb)
440 {
441 struct nfs_server *server = NFS_SB(sb);
442
443 if (atomic_dec_and_test(&server->active))
444 deactivate_super(sb);
445 }
446
447 /*
448 * Deliver file system statistics to userspace
449 */
450 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
451 {
452 struct nfs_server *server = NFS_SB(dentry->d_sb);
453 unsigned char blockbits;
454 unsigned long blockres;
455 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
456 struct nfs_fsstat res;
457 int error = -ENOMEM;
458
459 res.fattr = nfs_alloc_fattr();
460 if (res.fattr == NULL)
461 goto out_err;
462
463 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
464 if (unlikely(error == -ESTALE)) {
465 struct dentry *pd_dentry;
466
467 pd_dentry = dget_parent(dentry);
468 if (pd_dentry != NULL) {
469 nfs_zap_caches(pd_dentry->d_inode);
470 dput(pd_dentry);
471 }
472 }
473 nfs_free_fattr(res.fattr);
474 if (error < 0)
475 goto out_err;
476
477 buf->f_type = NFS_SUPER_MAGIC;
478
479 /*
480 * Current versions of glibc do not correctly handle the
481 * case where f_frsize != f_bsize. Eventually we want to
482 * report the value of wtmult in this field.
483 */
484 buf->f_frsize = dentry->d_sb->s_blocksize;
485
486 /*
487 * On most *nix systems, f_blocks, f_bfree, and f_bavail
488 * are reported in units of f_frsize. Linux hasn't had
489 * an f_frsize field in its statfs struct until recently,
490 * thus historically Linux's sys_statfs reports these
491 * fields in units of f_bsize.
492 */
493 buf->f_bsize = dentry->d_sb->s_blocksize;
494 blockbits = dentry->d_sb->s_blocksize_bits;
495 blockres = (1 << blockbits) - 1;
496 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
497 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
498 buf->f_bavail = (res.abytes + blockres) >> blockbits;
499
500 buf->f_files = res.tfiles;
501 buf->f_ffree = res.afiles;
502
503 buf->f_namelen = server->namelen;
504
505 return 0;
506
507 out_err:
508 dprintk("%s: statfs error = %d\n", __func__, -error);
509 return error;
510 }
511
512 /*
513 * Map the security flavour number to a name
514 */
515 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
516 {
517 static const struct {
518 rpc_authflavor_t flavour;
519 const char *str;
520 } sec_flavours[] = {
521 { RPC_AUTH_NULL, "null" },
522 { RPC_AUTH_UNIX, "sys" },
523 { RPC_AUTH_GSS_KRB5, "krb5" },
524 { RPC_AUTH_GSS_KRB5I, "krb5i" },
525 { RPC_AUTH_GSS_KRB5P, "krb5p" },
526 { RPC_AUTH_GSS_LKEY, "lkey" },
527 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
528 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
529 { RPC_AUTH_GSS_SPKM, "spkm" },
530 { RPC_AUTH_GSS_SPKMI, "spkmi" },
531 { RPC_AUTH_GSS_SPKMP, "spkmp" },
532 { UINT_MAX, "unknown" }
533 };
534 int i;
535
536 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
537 if (sec_flavours[i].flavour == flavour)
538 break;
539 }
540 return sec_flavours[i].str;
541 }
542
543 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
544 int showdefaults)
545 {
546 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
547
548 seq_printf(m, ",mountproto=");
549 switch (sap->sa_family) {
550 case AF_INET:
551 switch (nfss->mountd_protocol) {
552 case IPPROTO_UDP:
553 seq_printf(m, RPCBIND_NETID_UDP);
554 break;
555 case IPPROTO_TCP:
556 seq_printf(m, RPCBIND_NETID_TCP);
557 break;
558 default:
559 if (showdefaults)
560 seq_printf(m, "auto");
561 }
562 break;
563 case AF_INET6:
564 switch (nfss->mountd_protocol) {
565 case IPPROTO_UDP:
566 seq_printf(m, RPCBIND_NETID_UDP6);
567 break;
568 case IPPROTO_TCP:
569 seq_printf(m, RPCBIND_NETID_TCP6);
570 break;
571 default:
572 if (showdefaults)
573 seq_printf(m, "auto");
574 }
575 break;
576 default:
577 if (showdefaults)
578 seq_printf(m, "auto");
579 }
580 }
581
582 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
583 int showdefaults)
584 {
585 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
586
587 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
588 return;
589
590 switch (sap->sa_family) {
591 case AF_INET: {
592 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
593 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
594 break;
595 }
596 case AF_INET6: {
597 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
598 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
599 break;
600 }
601 default:
602 if (showdefaults)
603 seq_printf(m, ",mountaddr=unspecified");
604 }
605
606 if (nfss->mountd_version || showdefaults)
607 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
608 if ((nfss->mountd_port &&
609 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
610 showdefaults)
611 seq_printf(m, ",mountport=%u", nfss->mountd_port);
612
613 nfs_show_mountd_netid(m, nfss, showdefaults);
614 }
615
616 #ifdef CONFIG_NFS_V4
617 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
618 int showdefaults)
619 {
620 struct nfs_client *clp = nfss->nfs_client;
621
622 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
623 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
624 }
625 #else
626 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
627 int showdefaults)
628 {
629 }
630 #endif
631
632 /*
633 * Describe the mount options in force on this server representation
634 */
635 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
636 int showdefaults)
637 {
638 static const struct proc_nfs_info {
639 int flag;
640 const char *str;
641 const char *nostr;
642 } nfs_info[] = {
643 { NFS_MOUNT_SOFT, ",soft", ",hard" },
644 { NFS_MOUNT_POSIX, ",posix", "" },
645 { NFS_MOUNT_NOCTO, ",nocto", "" },
646 { NFS_MOUNT_NOAC, ",noac", "" },
647 { NFS_MOUNT_NONLM, ",nolock", "" },
648 { NFS_MOUNT_NOACL, ",noacl", "" },
649 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
650 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
651 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
652 { 0, NULL, NULL }
653 };
654 const struct proc_nfs_info *nfs_infop;
655 struct nfs_client *clp = nfss->nfs_client;
656 u32 version = clp->rpc_ops->version;
657 int local_flock, local_fcntl;
658
659 seq_printf(m, ",vers=%u", version);
660 seq_printf(m, ",rsize=%u", nfss->rsize);
661 seq_printf(m, ",wsize=%u", nfss->wsize);
662 if (nfss->bsize != 0)
663 seq_printf(m, ",bsize=%u", nfss->bsize);
664 seq_printf(m, ",namlen=%u", nfss->namelen);
665 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
666 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
667 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
668 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
669 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
670 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
671 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
672 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
673 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
674 if (nfss->flags & nfs_infop->flag)
675 seq_puts(m, nfs_infop->str);
676 else
677 seq_puts(m, nfs_infop->nostr);
678 }
679 seq_printf(m, ",proto=%s",
680 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
681 if (version == 4) {
682 if (nfss->port != NFS_PORT)
683 seq_printf(m, ",port=%u", nfss->port);
684 } else
685 if (nfss->port)
686 seq_printf(m, ",port=%u", nfss->port);
687
688 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
689 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
690 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
691
692 if (version != 4)
693 nfs_show_mountd_options(m, nfss, showdefaults);
694 else
695 nfs_show_nfsv4_options(m, nfss, showdefaults);
696
697 if (nfss->options & NFS_OPTION_FSCACHE)
698 seq_printf(m, ",fsc");
699
700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
702 seq_printf(m, ",lookupcache=none");
703 else
704 seq_printf(m, ",lookupcache=pos");
705 }
706
707 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
708 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
709
710 if (!local_flock && !local_fcntl)
711 seq_printf(m, ",local_lock=none");
712 else if (local_flock && local_fcntl)
713 seq_printf(m, ",local_lock=all");
714 else if (local_flock)
715 seq_printf(m, ",local_lock=flock");
716 else
717 seq_printf(m, ",local_lock=posix");
718 }
719
720 /*
721 * Describe the mount options on this VFS mountpoint
722 */
723 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
724 {
725 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
726
727 nfs_show_mount_options(m, nfss, 0);
728
729 seq_printf(m, ",addr=%s",
730 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
731 RPC_DISPLAY_ADDR));
732
733 return 0;
734 }
735
736 static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
737 {
738 char *page = (char *) __get_free_page(GFP_KERNEL);
739 char *devname, *dummy;
740 int err = 0;
741 if (!page)
742 return -ENOMEM;
743 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
744 if (IS_ERR(devname))
745 err = PTR_ERR(devname);
746 else
747 seq_escape(m, devname, " \t\n\\");
748 free_page((unsigned long)page);
749 return err;
750 }
751
752 static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
753 {
754 seq_puts(m, "/");
755 return 0;
756 }
757
758 /*
759 * Present statistical information for this VFS mountpoint
760 */
761 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
762 {
763 int i, cpu;
764 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
765 struct rpc_auth *auth = nfss->client->cl_auth;
766 struct nfs_iostats totals = { };
767
768 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
769
770 /*
771 * Display all mount option settings
772 */
773 seq_printf(m, "\n\topts:\t");
774 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
775 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
776 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
777 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
778 nfs_show_mount_options(m, nfss, 1);
779
780 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
781
782 seq_printf(m, "\n\tcaps:\t");
783 seq_printf(m, "caps=0x%x", nfss->caps);
784 seq_printf(m, ",wtmult=%u", nfss->wtmult);
785 seq_printf(m, ",dtsize=%u", nfss->dtsize);
786 seq_printf(m, ",bsize=%u", nfss->bsize);
787 seq_printf(m, ",namlen=%u", nfss->namelen);
788
789 #ifdef CONFIG_NFS_V4
790 if (nfss->nfs_client->rpc_ops->version == 4) {
791 seq_printf(m, "\n\tnfsv4:\t");
792 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
793 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
794 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
795 }
796 #endif
797
798 /*
799 * Display security flavor in effect for this mount
800 */
801 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
802 if (auth->au_flavor)
803 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
804
805 /*
806 * Display superblock I/O counters
807 */
808 for_each_possible_cpu(cpu) {
809 struct nfs_iostats *stats;
810
811 preempt_disable();
812 stats = per_cpu_ptr(nfss->io_stats, cpu);
813
814 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
815 totals.events[i] += stats->events[i];
816 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
817 totals.bytes[i] += stats->bytes[i];
818 #ifdef CONFIG_NFS_FSCACHE
819 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
820 totals.fscache[i] += stats->fscache[i];
821 #endif
822
823 preempt_enable();
824 }
825
826 seq_printf(m, "\n\tevents:\t");
827 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
828 seq_printf(m, "%lu ", totals.events[i]);
829 seq_printf(m, "\n\tbytes:\t");
830 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
831 seq_printf(m, "%Lu ", totals.bytes[i]);
832 #ifdef CONFIG_NFS_FSCACHE
833 if (nfss->options & NFS_OPTION_FSCACHE) {
834 seq_printf(m, "\n\tfsc:\t");
835 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
836 seq_printf(m, "%Lu ", totals.bytes[i]);
837 }
838 #endif
839 seq_printf(m, "\n");
840
841 rpc_print_iostats(m, nfss->client);
842
843 return 0;
844 }
845
846 /*
847 * Begin unmount by attempting to remove all automounted mountpoints we added
848 * in response to xdev traversals and referrals
849 */
850 static void nfs_umount_begin(struct super_block *sb)
851 {
852 struct nfs_server *server;
853 struct rpc_clnt *rpc;
854
855 server = NFS_SB(sb);
856 /* -EIO all pending I/O */
857 rpc = server->client_acl;
858 if (!IS_ERR(rpc))
859 rpc_killall_tasks(rpc);
860 rpc = server->client;
861 if (!IS_ERR(rpc))
862 rpc_killall_tasks(rpc);
863 }
864
865 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
866 {
867 struct nfs_parsed_mount_data *data;
868
869 data = kzalloc(sizeof(*data), GFP_KERNEL);
870 if (data) {
871 data->acregmin = NFS_DEF_ACREGMIN;
872 data->acregmax = NFS_DEF_ACREGMAX;
873 data->acdirmin = NFS_DEF_ACDIRMIN;
874 data->acdirmax = NFS_DEF_ACDIRMAX;
875 data->mount_server.port = NFS_UNSPEC_PORT;
876 data->nfs_server.port = NFS_UNSPEC_PORT;
877 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
878 data->auth_flavors[0] = RPC_AUTH_UNIX;
879 data->auth_flavor_len = 1;
880 data->version = version;
881 data->minorversion = 0;
882 }
883 return data;
884 }
885
886 /*
887 * Sanity-check a server address provided by the mount command.
888 *
889 * Address family must be initialized, and address must not be
890 * the ANY address for that family.
891 */
892 static int nfs_verify_server_address(struct sockaddr *addr)
893 {
894 switch (addr->sa_family) {
895 case AF_INET: {
896 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
897 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
898 }
899 case AF_INET6: {
900 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
901 return !ipv6_addr_any(sa);
902 }
903 }
904
905 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
906 return 0;
907 }
908
909 /*
910 * Select between a default port value and a user-specified port value.
911 * If a zero value is set, then autobind will be used.
912 */
913 static void nfs_set_port(struct sockaddr *sap, int *port,
914 const unsigned short default_port)
915 {
916 if (*port == NFS_UNSPEC_PORT)
917 *port = default_port;
918
919 rpc_set_port(sap, *port);
920 }
921
922 /*
923 * Sanity check the NFS transport protocol.
924 *
925 */
926 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
927 {
928 switch (mnt->nfs_server.protocol) {
929 case XPRT_TRANSPORT_UDP:
930 case XPRT_TRANSPORT_TCP:
931 case XPRT_TRANSPORT_RDMA:
932 break;
933 default:
934 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
935 }
936 }
937
938 /*
939 * For text based NFSv2/v3 mounts, the mount protocol transport default
940 * settings should depend upon the specified NFS transport.
941 */
942 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
943 {
944 nfs_validate_transport_protocol(mnt);
945
946 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
947 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
948 return;
949 switch (mnt->nfs_server.protocol) {
950 case XPRT_TRANSPORT_UDP:
951 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
952 break;
953 case XPRT_TRANSPORT_TCP:
954 case XPRT_TRANSPORT_RDMA:
955 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
956 }
957 }
958
959 /*
960 * Parse the value of the 'sec=' option.
961 */
962 static int nfs_parse_security_flavors(char *value,
963 struct nfs_parsed_mount_data *mnt)
964 {
965 substring_t args[MAX_OPT_ARGS];
966
967 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
968
969 switch (match_token(value, nfs_secflavor_tokens, args)) {
970 case Opt_sec_none:
971 mnt->auth_flavors[0] = RPC_AUTH_NULL;
972 break;
973 case Opt_sec_sys:
974 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
975 break;
976 case Opt_sec_krb5:
977 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
978 break;
979 case Opt_sec_krb5i:
980 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
981 break;
982 case Opt_sec_krb5p:
983 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
984 break;
985 case Opt_sec_lkey:
986 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
987 break;
988 case Opt_sec_lkeyi:
989 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
990 break;
991 case Opt_sec_lkeyp:
992 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
993 break;
994 case Opt_sec_spkm:
995 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
996 break;
997 case Opt_sec_spkmi:
998 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
999 break;
1000 case Opt_sec_spkmp:
1001 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1002 break;
1003 default:
1004 return 0;
1005 }
1006
1007 mnt->auth_flavor_len = 1;
1008 return 1;
1009 }
1010
1011 static int nfs_get_option_str(substring_t args[], char **option)
1012 {
1013 kfree(*option);
1014 *option = match_strdup(args);
1015 return !option;
1016 }
1017
1018 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1019 {
1020 int rc;
1021 char *string;
1022
1023 string = match_strdup(args);
1024 if (string == NULL)
1025 return -ENOMEM;
1026 rc = strict_strtoul(string, 10, option);
1027 kfree(string);
1028
1029 return rc;
1030 }
1031
1032 /*
1033 * Error-check and convert a string of mount options from user space into
1034 * a data structure. The whole mount string is processed; bad options are
1035 * skipped as they are encountered. If there were no errors, return 1;
1036 * otherwise return 0 (zero).
1037 */
1038 static int nfs_parse_mount_options(char *raw,
1039 struct nfs_parsed_mount_data *mnt)
1040 {
1041 char *p, *string, *secdata;
1042 int rc, sloppy = 0, invalid_option = 0;
1043 unsigned short protofamily = AF_UNSPEC;
1044 unsigned short mountfamily = AF_UNSPEC;
1045
1046 if (!raw) {
1047 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1048 return 1;
1049 }
1050 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1051
1052 secdata = alloc_secdata();
1053 if (!secdata)
1054 goto out_nomem;
1055
1056 rc = security_sb_copy_data(raw, secdata);
1057 if (rc)
1058 goto out_security_failure;
1059
1060 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1061 if (rc)
1062 goto out_security_failure;
1063
1064 free_secdata(secdata);
1065
1066 while ((p = strsep(&raw, ",")) != NULL) {
1067 substring_t args[MAX_OPT_ARGS];
1068 unsigned long option;
1069 int token;
1070
1071 if (!*p)
1072 continue;
1073
1074 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1075
1076 token = match_token(p, nfs_mount_option_tokens, args);
1077 switch (token) {
1078
1079 /*
1080 * boolean options: foo/nofoo
1081 */
1082 case Opt_soft:
1083 mnt->flags |= NFS_MOUNT_SOFT;
1084 break;
1085 case Opt_hard:
1086 mnt->flags &= ~NFS_MOUNT_SOFT;
1087 break;
1088 case Opt_posix:
1089 mnt->flags |= NFS_MOUNT_POSIX;
1090 break;
1091 case Opt_noposix:
1092 mnt->flags &= ~NFS_MOUNT_POSIX;
1093 break;
1094 case Opt_cto:
1095 mnt->flags &= ~NFS_MOUNT_NOCTO;
1096 break;
1097 case Opt_nocto:
1098 mnt->flags |= NFS_MOUNT_NOCTO;
1099 break;
1100 case Opt_ac:
1101 mnt->flags &= ~NFS_MOUNT_NOAC;
1102 break;
1103 case Opt_noac:
1104 mnt->flags |= NFS_MOUNT_NOAC;
1105 break;
1106 case Opt_lock:
1107 mnt->flags &= ~NFS_MOUNT_NONLM;
1108 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1109 NFS_MOUNT_LOCAL_FCNTL);
1110 break;
1111 case Opt_nolock:
1112 mnt->flags |= NFS_MOUNT_NONLM;
1113 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1114 NFS_MOUNT_LOCAL_FCNTL);
1115 break;
1116 case Opt_v2:
1117 mnt->flags &= ~NFS_MOUNT_VER3;
1118 mnt->version = 2;
1119 break;
1120 case Opt_v3:
1121 mnt->flags |= NFS_MOUNT_VER3;
1122 mnt->version = 3;
1123 break;
1124 case Opt_v4:
1125 mnt->flags &= ~NFS_MOUNT_VER3;
1126 mnt->version = 4;
1127 break;
1128 case Opt_udp:
1129 mnt->flags &= ~NFS_MOUNT_TCP;
1130 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1131 break;
1132 case Opt_tcp:
1133 mnt->flags |= NFS_MOUNT_TCP;
1134 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1135 break;
1136 case Opt_rdma:
1137 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1138 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1139 xprt_load_transport(p);
1140 break;
1141 case Opt_acl:
1142 mnt->flags &= ~NFS_MOUNT_NOACL;
1143 break;
1144 case Opt_noacl:
1145 mnt->flags |= NFS_MOUNT_NOACL;
1146 break;
1147 case Opt_rdirplus:
1148 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1149 break;
1150 case Opt_nordirplus:
1151 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1152 break;
1153 case Opt_sharecache:
1154 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1155 break;
1156 case Opt_nosharecache:
1157 mnt->flags |= NFS_MOUNT_UNSHARED;
1158 break;
1159 case Opt_resvport:
1160 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1161 break;
1162 case Opt_noresvport:
1163 mnt->flags |= NFS_MOUNT_NORESVPORT;
1164 break;
1165 case Opt_fscache:
1166 mnt->options |= NFS_OPTION_FSCACHE;
1167 kfree(mnt->fscache_uniq);
1168 mnt->fscache_uniq = NULL;
1169 break;
1170 case Opt_nofscache:
1171 mnt->options &= ~NFS_OPTION_FSCACHE;
1172 kfree(mnt->fscache_uniq);
1173 mnt->fscache_uniq = NULL;
1174 break;
1175
1176 /*
1177 * options that take numeric values
1178 */
1179 case Opt_port:
1180 if (nfs_get_option_ul(args, &option) ||
1181 option > USHRT_MAX)
1182 goto out_invalid_value;
1183 mnt->nfs_server.port = option;
1184 break;
1185 case Opt_rsize:
1186 if (nfs_get_option_ul(args, &option))
1187 goto out_invalid_value;
1188 mnt->rsize = option;
1189 break;
1190 case Opt_wsize:
1191 if (nfs_get_option_ul(args, &option))
1192 goto out_invalid_value;
1193 mnt->wsize = option;
1194 break;
1195 case Opt_bsize:
1196 if (nfs_get_option_ul(args, &option))
1197 goto out_invalid_value;
1198 mnt->bsize = option;
1199 break;
1200 case Opt_timeo:
1201 if (nfs_get_option_ul(args, &option) || option == 0)
1202 goto out_invalid_value;
1203 mnt->timeo = option;
1204 break;
1205 case Opt_retrans:
1206 if (nfs_get_option_ul(args, &option) || option == 0)
1207 goto out_invalid_value;
1208 mnt->retrans = option;
1209 break;
1210 case Opt_acregmin:
1211 if (nfs_get_option_ul(args, &option))
1212 goto out_invalid_value;
1213 mnt->acregmin = option;
1214 break;
1215 case Opt_acregmax:
1216 if (nfs_get_option_ul(args, &option))
1217 goto out_invalid_value;
1218 mnt->acregmax = option;
1219 break;
1220 case Opt_acdirmin:
1221 if (nfs_get_option_ul(args, &option))
1222 goto out_invalid_value;
1223 mnt->acdirmin = option;
1224 break;
1225 case Opt_acdirmax:
1226 if (nfs_get_option_ul(args, &option))
1227 goto out_invalid_value;
1228 mnt->acdirmax = option;
1229 break;
1230 case Opt_actimeo:
1231 if (nfs_get_option_ul(args, &option))
1232 goto out_invalid_value;
1233 mnt->acregmin = mnt->acregmax =
1234 mnt->acdirmin = mnt->acdirmax = option;
1235 break;
1236 case Opt_namelen:
1237 if (nfs_get_option_ul(args, &option))
1238 goto out_invalid_value;
1239 mnt->namlen = option;
1240 break;
1241 case Opt_mountport:
1242 if (nfs_get_option_ul(args, &option) ||
1243 option > USHRT_MAX)
1244 goto out_invalid_value;
1245 mnt->mount_server.port = option;
1246 break;
1247 case Opt_mountvers:
1248 if (nfs_get_option_ul(args, &option) ||
1249 option < NFS_MNT_VERSION ||
1250 option > NFS_MNT3_VERSION)
1251 goto out_invalid_value;
1252 mnt->mount_server.version = option;
1253 break;
1254 case Opt_nfsvers:
1255 if (nfs_get_option_ul(args, &option))
1256 goto out_invalid_value;
1257 switch (option) {
1258 case NFS2_VERSION:
1259 mnt->flags &= ~NFS_MOUNT_VER3;
1260 mnt->version = 2;
1261 break;
1262 case NFS3_VERSION:
1263 mnt->flags |= NFS_MOUNT_VER3;
1264 mnt->version = 3;
1265 break;
1266 case NFS4_VERSION:
1267 mnt->flags &= ~NFS_MOUNT_VER3;
1268 mnt->version = 4;
1269 break;
1270 default:
1271 goto out_invalid_value;
1272 }
1273 break;
1274 case Opt_minorversion:
1275 if (nfs_get_option_ul(args, &option))
1276 goto out_invalid_value;
1277 if (option > NFS4_MAX_MINOR_VERSION)
1278 goto out_invalid_value;
1279 mnt->minorversion = option;
1280 break;
1281
1282 /*
1283 * options that take text values
1284 */
1285 case Opt_sec:
1286 string = match_strdup(args);
1287 if (string == NULL)
1288 goto out_nomem;
1289 rc = nfs_parse_security_flavors(string, mnt);
1290 kfree(string);
1291 if (!rc) {
1292 dfprintk(MOUNT, "NFS: unrecognized "
1293 "security flavor\n");
1294 return 0;
1295 }
1296 break;
1297 case Opt_proto:
1298 string = match_strdup(args);
1299 if (string == NULL)
1300 goto out_nomem;
1301 token = match_token(string,
1302 nfs_xprt_protocol_tokens, args);
1303
1304 protofamily = AF_INET;
1305 switch (token) {
1306 case Opt_xprt_udp6:
1307 protofamily = AF_INET6;
1308 case Opt_xprt_udp:
1309 mnt->flags &= ~NFS_MOUNT_TCP;
1310 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1311 break;
1312 case Opt_xprt_tcp6:
1313 protofamily = AF_INET6;
1314 case Opt_xprt_tcp:
1315 mnt->flags |= NFS_MOUNT_TCP;
1316 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1317 break;
1318 case Opt_xprt_rdma:
1319 /* vector side protocols to TCP */
1320 mnt->flags |= NFS_MOUNT_TCP;
1321 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1322 xprt_load_transport(string);
1323 break;
1324 default:
1325 dfprintk(MOUNT, "NFS: unrecognized "
1326 "transport protocol\n");
1327 kfree(string);
1328 return 0;
1329 }
1330 kfree(string);
1331 break;
1332 case Opt_mountproto:
1333 string = match_strdup(args);
1334 if (string == NULL)
1335 goto out_nomem;
1336 token = match_token(string,
1337 nfs_xprt_protocol_tokens, args);
1338 kfree(string);
1339
1340 mountfamily = AF_INET;
1341 switch (token) {
1342 case Opt_xprt_udp6:
1343 mountfamily = AF_INET6;
1344 case Opt_xprt_udp:
1345 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1346 break;
1347 case Opt_xprt_tcp6:
1348 mountfamily = AF_INET6;
1349 case Opt_xprt_tcp:
1350 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1351 break;
1352 case Opt_xprt_rdma: /* not used for side protocols */
1353 default:
1354 dfprintk(MOUNT, "NFS: unrecognized "
1355 "transport protocol\n");
1356 return 0;
1357 }
1358 break;
1359 case Opt_addr:
1360 string = match_strdup(args);
1361 if (string == NULL)
1362 goto out_nomem;
1363 mnt->nfs_server.addrlen =
1364 rpc_pton(string, strlen(string),
1365 (struct sockaddr *)
1366 &mnt->nfs_server.address,
1367 sizeof(mnt->nfs_server.address));
1368 kfree(string);
1369 if (mnt->nfs_server.addrlen == 0)
1370 goto out_invalid_address;
1371 break;
1372 case Opt_clientaddr:
1373 if (nfs_get_option_str(args, &mnt->client_address))
1374 goto out_nomem;
1375 break;
1376 case Opt_mounthost:
1377 if (nfs_get_option_str(args,
1378 &mnt->mount_server.hostname))
1379 goto out_nomem;
1380 break;
1381 case Opt_mountaddr:
1382 string = match_strdup(args);
1383 if (string == NULL)
1384 goto out_nomem;
1385 mnt->mount_server.addrlen =
1386 rpc_pton(string, strlen(string),
1387 (struct sockaddr *)
1388 &mnt->mount_server.address,
1389 sizeof(mnt->mount_server.address));
1390 kfree(string);
1391 if (mnt->mount_server.addrlen == 0)
1392 goto out_invalid_address;
1393 break;
1394 case Opt_lookupcache:
1395 string = match_strdup(args);
1396 if (string == NULL)
1397 goto out_nomem;
1398 token = match_token(string,
1399 nfs_lookupcache_tokens, args);
1400 kfree(string);
1401 switch (token) {
1402 case Opt_lookupcache_all:
1403 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1404 break;
1405 case Opt_lookupcache_positive:
1406 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1407 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1408 break;
1409 case Opt_lookupcache_none:
1410 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1411 break;
1412 default:
1413 dfprintk(MOUNT, "NFS: invalid "
1414 "lookupcache argument\n");
1415 return 0;
1416 };
1417 break;
1418 case Opt_fscache_uniq:
1419 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1420 goto out_nomem;
1421 mnt->options |= NFS_OPTION_FSCACHE;
1422 break;
1423 case Opt_local_lock:
1424 string = match_strdup(args);
1425 if (string == NULL)
1426 goto out_nomem;
1427 token = match_token(string, nfs_local_lock_tokens,
1428 args);
1429 kfree(string);
1430 switch (token) {
1431 case Opt_local_lock_all:
1432 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1433 NFS_MOUNT_LOCAL_FCNTL);
1434 break;
1435 case Opt_local_lock_flock:
1436 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1437 break;
1438 case Opt_local_lock_posix:
1439 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1440 break;
1441 case Opt_local_lock_none:
1442 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1443 NFS_MOUNT_LOCAL_FCNTL);
1444 break;
1445 default:
1446 dfprintk(MOUNT, "NFS: invalid "
1447 "local_lock argument\n");
1448 return 0;
1449 };
1450 break;
1451
1452 /*
1453 * Special options
1454 */
1455 case Opt_sloppy:
1456 sloppy = 1;
1457 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1458 break;
1459 case Opt_userspace:
1460 case Opt_deprecated:
1461 dfprintk(MOUNT, "NFS: ignoring mount option "
1462 "'%s'\n", p);
1463 break;
1464
1465 default:
1466 invalid_option = 1;
1467 dfprintk(MOUNT, "NFS: unrecognized mount option "
1468 "'%s'\n", p);
1469 }
1470 }
1471
1472 if (!sloppy && invalid_option)
1473 return 0;
1474
1475 /*
1476 * verify that any proto=/mountproto= options match the address
1477 * familiies in the addr=/mountaddr= options.
1478 */
1479 if (protofamily != AF_UNSPEC &&
1480 protofamily != mnt->nfs_server.address.ss_family)
1481 goto out_proto_mismatch;
1482
1483 if (mountfamily != AF_UNSPEC) {
1484 if (mnt->mount_server.addrlen) {
1485 if (mountfamily != mnt->mount_server.address.ss_family)
1486 goto out_mountproto_mismatch;
1487 } else {
1488 if (mountfamily != mnt->nfs_server.address.ss_family)
1489 goto out_mountproto_mismatch;
1490 }
1491 }
1492
1493 return 1;
1494
1495 out_mountproto_mismatch:
1496 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1497 "option\n");
1498 return 0;
1499 out_proto_mismatch:
1500 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1501 return 0;
1502 out_invalid_address:
1503 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1504 return 0;
1505 out_invalid_value:
1506 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1507 return 0;
1508 out_nomem:
1509 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1510 return 0;
1511 out_security_failure:
1512 free_secdata(secdata);
1513 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1514 return 0;
1515 }
1516
1517 /*
1518 * Match the requested auth flavors with the list returned by
1519 * the server. Returns zero and sets the mount's authentication
1520 * flavor on success; returns -EACCES if server does not support
1521 * the requested flavor.
1522 */
1523 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1524 struct nfs_mount_request *request)
1525 {
1526 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1527
1528 /*
1529 * Certain releases of Linux's mountd return an empty
1530 * flavor list. To prevent behavioral regression with
1531 * these servers (ie. rejecting mounts that used to
1532 * succeed), revert to pre-2.6.32 behavior (no checking)
1533 * if the returned flavor list is empty.
1534 */
1535 if (server_authlist_len == 0)
1536 return 0;
1537
1538 /*
1539 * We avoid sophisticated negotiating here, as there are
1540 * plenty of cases where we can get it wrong, providing
1541 * either too little or too much security.
1542 *
1543 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1544 * flavor listed first. However, some servers list
1545 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1546 * preferred default, in args->auth_flavors[0] if user
1547 * didn't specify sec= mount option.
1548 */
1549 for (i = 0; i < args->auth_flavor_len; i++)
1550 for (j = 0; j < server_authlist_len; j++)
1551 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1552 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1553 request->auth_flavs[j]);
1554 args->auth_flavors[0] = request->auth_flavs[j];
1555 return 0;
1556 }
1557
1558 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1559 nfs_umount(request);
1560 return -EACCES;
1561 }
1562
1563 /*
1564 * Use the remote server's MOUNT service to request the NFS file handle
1565 * corresponding to the provided path.
1566 */
1567 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1568 struct nfs_fh *root_fh)
1569 {
1570 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1571 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1572 struct nfs_mount_request request = {
1573 .sap = (struct sockaddr *)
1574 &args->mount_server.address,
1575 .dirpath = args->nfs_server.export_path,
1576 .protocol = args->mount_server.protocol,
1577 .fh = root_fh,
1578 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1579 .auth_flav_len = &server_authlist_len,
1580 .auth_flavs = server_authlist,
1581 };
1582 int status;
1583
1584 if (args->mount_server.version == 0) {
1585 switch (args->version) {
1586 default:
1587 args->mount_server.version = NFS_MNT3_VERSION;
1588 break;
1589 case 2:
1590 args->mount_server.version = NFS_MNT_VERSION;
1591 }
1592 }
1593 request.version = args->mount_server.version;
1594
1595 if (args->mount_server.hostname)
1596 request.hostname = args->mount_server.hostname;
1597 else
1598 request.hostname = args->nfs_server.hostname;
1599
1600 /*
1601 * Construct the mount server's address.
1602 */
1603 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1604 memcpy(request.sap, &args->nfs_server.address,
1605 args->nfs_server.addrlen);
1606 args->mount_server.addrlen = args->nfs_server.addrlen;
1607 }
1608 request.salen = args->mount_server.addrlen;
1609 nfs_set_port(request.sap, &args->mount_server.port, 0);
1610
1611 /*
1612 * Now ask the mount server to map our export path
1613 * to a file handle.
1614 */
1615 status = nfs_mount(&request);
1616 if (status != 0) {
1617 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1618 request.hostname, status);
1619 return status;
1620 }
1621
1622 /*
1623 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1624 */
1625 if (args->mount_server.version != NFS_MNT3_VERSION)
1626 return 0;
1627 return nfs_walk_authlist(args, &request);
1628 }
1629
1630 /*
1631 * Split "dev_name" into "hostname:export_path".
1632 *
1633 * The leftmost colon demarks the split between the server's hostname
1634 * and the export path. If the hostname starts with a left square
1635 * bracket, then it may contain colons.
1636 *
1637 * Note: caller frees hostname and export path, even on error.
1638 */
1639 static int nfs_parse_devname(const char *dev_name,
1640 char **hostname, size_t maxnamlen,
1641 char **export_path, size_t maxpathlen)
1642 {
1643 size_t len;
1644 char *end;
1645
1646 /* Is the host name protected with square brakcets? */
1647 if (*dev_name == '[') {
1648 end = strchr(++dev_name, ']');
1649 if (end == NULL || end[1] != ':')
1650 goto out_bad_devname;
1651
1652 len = end - dev_name;
1653 end++;
1654 } else {
1655 char *comma;
1656
1657 end = strchr(dev_name, ':');
1658 if (end == NULL)
1659 goto out_bad_devname;
1660 len = end - dev_name;
1661
1662 /* kill possible hostname list: not supported */
1663 comma = strchr(dev_name, ',');
1664 if (comma != NULL && comma < end)
1665 *comma = 0;
1666 }
1667
1668 if (len > maxnamlen)
1669 goto out_hostname;
1670
1671 /* N.B. caller will free nfs_server.hostname in all cases */
1672 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1673 if (*hostname == NULL)
1674 goto out_nomem;
1675 len = strlen(++end);
1676 if (len > maxpathlen)
1677 goto out_path;
1678 *export_path = kstrndup(end, len, GFP_KERNEL);
1679 if (!*export_path)
1680 goto out_nomem;
1681
1682 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1683 return 0;
1684
1685 out_bad_devname:
1686 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1687 return -EINVAL;
1688
1689 out_nomem:
1690 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1691 return -ENOMEM;
1692
1693 out_hostname:
1694 dfprintk(MOUNT, "NFS: server hostname too long\n");
1695 return -ENAMETOOLONG;
1696
1697 out_path:
1698 dfprintk(MOUNT, "NFS: export pathname too long\n");
1699 return -ENAMETOOLONG;
1700 }
1701
1702 /*
1703 * Validate the NFS2/NFS3 mount data
1704 * - fills in the mount root filehandle
1705 *
1706 * For option strings, user space handles the following behaviors:
1707 *
1708 * + DNS: mapping server host name to IP address ("addr=" option)
1709 *
1710 * + failure mode: how to behave if a mount request can't be handled
1711 * immediately ("fg/bg" option)
1712 *
1713 * + retry: how often to retry a mount request ("retry=" option)
1714 *
1715 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1716 * mountproto=tcp after mountproto=udp, and so on
1717 */
1718 static int nfs_validate_mount_data(void *options,
1719 struct nfs_parsed_mount_data *args,
1720 struct nfs_fh *mntfh,
1721 const char *dev_name)
1722 {
1723 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1724 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1725
1726 if (data == NULL)
1727 goto out_no_data;
1728
1729 switch (data->version) {
1730 case 1:
1731 data->namlen = 0;
1732 case 2:
1733 data->bsize = 0;
1734 case 3:
1735 if (data->flags & NFS_MOUNT_VER3)
1736 goto out_no_v3;
1737 data->root.size = NFS2_FHSIZE;
1738 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1739 case 4:
1740 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1741 goto out_no_sec;
1742 case 5:
1743 memset(data->context, 0, sizeof(data->context));
1744 case 6:
1745 if (data->flags & NFS_MOUNT_VER3) {
1746 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1747 goto out_invalid_fh;
1748 mntfh->size = data->root.size;
1749 args->version = 3;
1750 } else {
1751 mntfh->size = NFS2_FHSIZE;
1752 args->version = 2;
1753 }
1754
1755
1756 memcpy(mntfh->data, data->root.data, mntfh->size);
1757 if (mntfh->size < sizeof(mntfh->data))
1758 memset(mntfh->data + mntfh->size, 0,
1759 sizeof(mntfh->data) - mntfh->size);
1760
1761 /*
1762 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1763 * can deal with.
1764 */
1765 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1766 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1767 args->rsize = data->rsize;
1768 args->wsize = data->wsize;
1769 args->timeo = data->timeo;
1770 args->retrans = data->retrans;
1771 args->acregmin = data->acregmin;
1772 args->acregmax = data->acregmax;
1773 args->acdirmin = data->acdirmin;
1774 args->acdirmax = data->acdirmax;
1775
1776 memcpy(sap, &data->addr, sizeof(data->addr));
1777 args->nfs_server.addrlen = sizeof(data->addr);
1778 if (!nfs_verify_server_address(sap))
1779 goto out_no_address;
1780
1781 if (!(data->flags & NFS_MOUNT_TCP))
1782 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1783 /* N.B. caller will free nfs_server.hostname in all cases */
1784 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1785 args->namlen = data->namlen;
1786 args->bsize = data->bsize;
1787
1788 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1789 args->auth_flavors[0] = data->pseudoflavor;
1790 if (!args->nfs_server.hostname)
1791 goto out_nomem;
1792
1793 if (!(data->flags & NFS_MOUNT_NONLM))
1794 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1795 NFS_MOUNT_LOCAL_FCNTL);
1796 else
1797 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1798 NFS_MOUNT_LOCAL_FCNTL);
1799 /*
1800 * The legacy version 6 binary mount data from userspace has a
1801 * field used only to transport selinux information into the
1802 * the kernel. To continue to support that functionality we
1803 * have a touch of selinux knowledge here in the NFS code. The
1804 * userspace code converted context=blah to just blah so we are
1805 * converting back to the full string selinux understands.
1806 */
1807 if (data->context[0]){
1808 #ifdef CONFIG_SECURITY_SELINUX
1809 int rc;
1810 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1811 if (!opts_str)
1812 return -ENOMEM;
1813 strcpy(opts_str, "context=");
1814 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1815 strcat(opts_str, &data->context[0]);
1816 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1817 kfree(opts_str);
1818 if (rc)
1819 return rc;
1820 #else
1821 return -EINVAL;
1822 #endif
1823 }
1824
1825 break;
1826 default: {
1827 int status;
1828
1829 if (nfs_parse_mount_options((char *)options, args) == 0)
1830 return -EINVAL;
1831
1832 if (!nfs_verify_server_address(sap))
1833 goto out_no_address;
1834
1835 if (args->version == 4)
1836 #ifdef CONFIG_NFS_V4
1837 return nfs4_validate_text_mount_data(options,
1838 args, dev_name);
1839 #else
1840 goto out_v4_not_compiled;
1841 #endif
1842
1843 nfs_set_port(sap, &args->nfs_server.port, 0);
1844
1845 nfs_set_mount_transport_protocol(args);
1846
1847 status = nfs_parse_devname(dev_name,
1848 &args->nfs_server.hostname,
1849 PAGE_SIZE,
1850 &args->nfs_server.export_path,
1851 NFS_MAXPATHLEN);
1852 if (!status)
1853 status = nfs_try_mount(args, mntfh);
1854
1855 kfree(args->nfs_server.export_path);
1856 args->nfs_server.export_path = NULL;
1857
1858 if (status)
1859 return status;
1860
1861 break;
1862 }
1863 }
1864
1865 #ifndef CONFIG_NFS_V3
1866 if (args->version == 3)
1867 goto out_v3_not_compiled;
1868 #endif /* !CONFIG_NFS_V3 */
1869
1870 return 0;
1871
1872 out_no_data:
1873 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1874 return -EINVAL;
1875
1876 out_no_v3:
1877 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1878 data->version);
1879 return -EINVAL;
1880
1881 out_no_sec:
1882 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1883 return -EINVAL;
1884
1885 #ifndef CONFIG_NFS_V3
1886 out_v3_not_compiled:
1887 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1888 return -EPROTONOSUPPORT;
1889 #endif /* !CONFIG_NFS_V3 */
1890
1891 #ifndef CONFIG_NFS_V4
1892 out_v4_not_compiled:
1893 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1894 return -EPROTONOSUPPORT;
1895 #endif /* !CONFIG_NFS_V4 */
1896
1897 out_nomem:
1898 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1899 return -ENOMEM;
1900
1901 out_no_address:
1902 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1903 return -EINVAL;
1904
1905 out_invalid_fh:
1906 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1907 return -EINVAL;
1908 }
1909
1910 static int
1911 nfs_compare_remount_data(struct nfs_server *nfss,
1912 struct nfs_parsed_mount_data *data)
1913 {
1914 if (data->flags != nfss->flags ||
1915 data->rsize != nfss->rsize ||
1916 data->wsize != nfss->wsize ||
1917 data->retrans != nfss->client->cl_timeout->to_retries ||
1918 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1919 data->acregmin != nfss->acregmin / HZ ||
1920 data->acregmax != nfss->acregmax / HZ ||
1921 data->acdirmin != nfss->acdirmin / HZ ||
1922 data->acdirmax != nfss->acdirmax / HZ ||
1923 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1924 data->nfs_server.port != nfss->port ||
1925 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1926 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1927 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1928 return -EINVAL;
1929
1930 return 0;
1931 }
1932
1933 static int
1934 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1935 {
1936 int error;
1937 struct nfs_server *nfss = sb->s_fs_info;
1938 struct nfs_parsed_mount_data *data;
1939 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1940 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1941 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1942
1943 /*
1944 * Userspace mount programs that send binary options generally send
1945 * them populated with default values. We have no way to know which
1946 * ones were explicitly specified. Fall back to legacy behavior and
1947 * just return success.
1948 */
1949 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1950 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1951 options->version <= 6))))
1952 return 0;
1953
1954 data = kzalloc(sizeof(*data), GFP_KERNEL);
1955 if (data == NULL)
1956 return -ENOMEM;
1957
1958 /* fill out struct with values from existing mount */
1959 data->flags = nfss->flags;
1960 data->rsize = nfss->rsize;
1961 data->wsize = nfss->wsize;
1962 data->retrans = nfss->client->cl_timeout->to_retries;
1963 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1964 data->acregmin = nfss->acregmin / HZ;
1965 data->acregmax = nfss->acregmax / HZ;
1966 data->acdirmin = nfss->acdirmin / HZ;
1967 data->acdirmax = nfss->acdirmax / HZ;
1968 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1969 data->nfs_server.port = nfss->port;
1970 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1971 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1972 data->nfs_server.addrlen);
1973
1974 /* overwrite those values with any that were specified */
1975 error = nfs_parse_mount_options((char *)options, data);
1976 if (error < 0)
1977 goto out;
1978
1979 /* compare new mount options with old ones */
1980 error = nfs_compare_remount_data(nfss, data);
1981 out:
1982 kfree(data);
1983 return error;
1984 }
1985
1986 /*
1987 * Initialise the common bits of the superblock
1988 */
1989 static inline void nfs_initialise_sb(struct super_block *sb)
1990 {
1991 struct nfs_server *server = NFS_SB(sb);
1992
1993 sb->s_magic = NFS_SUPER_MAGIC;
1994
1995 /* We probably want something more informative here */
1996 snprintf(sb->s_id, sizeof(sb->s_id),
1997 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1998
1999 if (sb->s_blocksize == 0)
2000 sb->s_blocksize = nfs_block_bits(server->wsize,
2001 &sb->s_blocksize_bits);
2002
2003 if (server->flags & NFS_MOUNT_NOAC)
2004 sb->s_flags |= MS_SYNCHRONOUS;
2005
2006 sb->s_bdi = &server->backing_dev_info;
2007
2008 nfs_super_set_maxbytes(sb, server->maxfilesize);
2009 }
2010
2011 /*
2012 * Finish setting up an NFS2/3 superblock
2013 */
2014 static void nfs_fill_super(struct super_block *sb,
2015 struct nfs_parsed_mount_data *data)
2016 {
2017 struct nfs_server *server = NFS_SB(sb);
2018
2019 sb->s_blocksize_bits = 0;
2020 sb->s_blocksize = 0;
2021 if (data->bsize)
2022 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2023
2024 if (server->nfs_client->rpc_ops->version == 3) {
2025 /* The VFS shouldn't apply the umask to mode bits. We will do
2026 * so ourselves when necessary.
2027 */
2028 sb->s_flags |= MS_POSIXACL;
2029 sb->s_time_gran = 1;
2030 }
2031
2032 sb->s_op = &nfs_sops;
2033 nfs_initialise_sb(sb);
2034 }
2035
2036 /*
2037 * Finish setting up a cloned NFS2/3 superblock
2038 */
2039 static void nfs_clone_super(struct super_block *sb,
2040 const struct super_block *old_sb)
2041 {
2042 struct nfs_server *server = NFS_SB(sb);
2043
2044 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2045 sb->s_blocksize = old_sb->s_blocksize;
2046 sb->s_maxbytes = old_sb->s_maxbytes;
2047
2048 if (server->nfs_client->rpc_ops->version == 3) {
2049 /* The VFS shouldn't apply the umask to mode bits. We will do
2050 * so ourselves when necessary.
2051 */
2052 sb->s_flags |= MS_POSIXACL;
2053 sb->s_time_gran = 1;
2054 }
2055
2056 sb->s_op = old_sb->s_op;
2057 nfs_initialise_sb(sb);
2058 }
2059
2060 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2061 {
2062 const struct nfs_server *a = s->s_fs_info;
2063 const struct rpc_clnt *clnt_a = a->client;
2064 const struct rpc_clnt *clnt_b = b->client;
2065
2066 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2067 goto Ebusy;
2068 if (a->nfs_client != b->nfs_client)
2069 goto Ebusy;
2070 if (a->flags != b->flags)
2071 goto Ebusy;
2072 if (a->wsize != b->wsize)
2073 goto Ebusy;
2074 if (a->rsize != b->rsize)
2075 goto Ebusy;
2076 if (a->acregmin != b->acregmin)
2077 goto Ebusy;
2078 if (a->acregmax != b->acregmax)
2079 goto Ebusy;
2080 if (a->acdirmin != b->acdirmin)
2081 goto Ebusy;
2082 if (a->acdirmax != b->acdirmax)
2083 goto Ebusy;
2084 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2085 goto Ebusy;
2086 return 1;
2087 Ebusy:
2088 return 0;
2089 }
2090
2091 struct nfs_sb_mountdata {
2092 struct nfs_server *server;
2093 int mntflags;
2094 };
2095
2096 static int nfs_set_super(struct super_block *s, void *data)
2097 {
2098 struct nfs_sb_mountdata *sb_mntdata = data;
2099 struct nfs_server *server = sb_mntdata->server;
2100 int ret;
2101
2102 s->s_flags = sb_mntdata->mntflags;
2103 s->s_fs_info = server;
2104 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2105 ret = set_anon_super(s, server);
2106 if (ret == 0)
2107 server->s_dev = s->s_dev;
2108 return ret;
2109 }
2110
2111 static int nfs_compare_super_address(struct nfs_server *server1,
2112 struct nfs_server *server2)
2113 {
2114 struct sockaddr *sap1, *sap2;
2115
2116 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2117 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2118
2119 if (sap1->sa_family != sap2->sa_family)
2120 return 0;
2121
2122 switch (sap1->sa_family) {
2123 case AF_INET: {
2124 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2125 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2126 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2127 return 0;
2128 if (sin1->sin_port != sin2->sin_port)
2129 return 0;
2130 break;
2131 }
2132 case AF_INET6: {
2133 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2134 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2135 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2136 return 0;
2137 if (sin1->sin6_port != sin2->sin6_port)
2138 return 0;
2139 break;
2140 }
2141 default:
2142 return 0;
2143 }
2144
2145 return 1;
2146 }
2147
2148 static int nfs_compare_super(struct super_block *sb, void *data)
2149 {
2150 struct nfs_sb_mountdata *sb_mntdata = data;
2151 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2152 int mntflags = sb_mntdata->mntflags;
2153
2154 if (!nfs_compare_super_address(old, server))
2155 return 0;
2156 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2157 if (old->flags & NFS_MOUNT_UNSHARED)
2158 return 0;
2159 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2160 return 0;
2161 return nfs_compare_mount_options(sb, server, mntflags);
2162 }
2163
2164 static int nfs_bdi_register(struct nfs_server *server)
2165 {
2166 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2167 }
2168
2169 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2170 int flags, const char *dev_name, void *raw_data)
2171 {
2172 struct nfs_server *server = NULL;
2173 struct super_block *s;
2174 struct nfs_parsed_mount_data *data;
2175 struct nfs_fh *mntfh;
2176 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2177 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2178 struct nfs_sb_mountdata sb_mntdata = {
2179 .mntflags = flags,
2180 };
2181 int error;
2182
2183 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2184 mntfh = nfs_alloc_fhandle();
2185 if (data == NULL || mntfh == NULL)
2186 goto out_free_fh;
2187
2188 security_init_mnt_opts(&data->lsm_opts);
2189
2190 /* Validate the mount data */
2191 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2192 if (error < 0) {
2193 mntroot = ERR_PTR(error);
2194 goto out;
2195 }
2196
2197 #ifdef CONFIG_NFS_V4
2198 if (data->version == 4) {
2199 mntroot = nfs4_try_mount(flags, dev_name, data);
2200 kfree(data->client_address);
2201 kfree(data->nfs_server.export_path);
2202 goto out;
2203 }
2204 #endif /* CONFIG_NFS_V4 */
2205
2206 /* Get a volume representation */
2207 server = nfs_create_server(data, mntfh);
2208 if (IS_ERR(server)) {
2209 mntroot = ERR_CAST(server);
2210 goto out;
2211 }
2212 sb_mntdata.server = server;
2213
2214 if (server->flags & NFS_MOUNT_UNSHARED)
2215 compare_super = NULL;
2216
2217 /* Get a superblock - note that we may end up sharing one that already exists */
2218 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2219 if (IS_ERR(s)) {
2220 mntroot = ERR_CAST(s);
2221 goto out_err_nosb;
2222 }
2223
2224 if (s->s_fs_info != server) {
2225 nfs_free_server(server);
2226 server = NULL;
2227 } else {
2228 error = nfs_bdi_register(server);
2229 if (error) {
2230 mntroot = ERR_PTR(error);
2231 goto error_splat_bdi;
2232 }
2233 }
2234
2235 if (!s->s_root) {
2236 /* initial superblock/root creation */
2237 nfs_fill_super(s, data);
2238 nfs_fscache_get_super_cookie(
2239 s, data ? data->fscache_uniq : NULL, NULL);
2240 }
2241
2242 mntroot = nfs_get_root(s, mntfh, dev_name);
2243 if (IS_ERR(mntroot))
2244 goto error_splat_super;
2245
2246 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2247 if (error)
2248 goto error_splat_root;
2249
2250 s->s_flags |= MS_ACTIVE;
2251
2252 out:
2253 kfree(data->nfs_server.hostname);
2254 kfree(data->mount_server.hostname);
2255 kfree(data->fscache_uniq);
2256 security_free_mnt_opts(&data->lsm_opts);
2257 out_free_fh:
2258 nfs_free_fhandle(mntfh);
2259 kfree(data);
2260 return mntroot;
2261
2262 out_err_nosb:
2263 nfs_free_server(server);
2264 goto out;
2265
2266 error_splat_root:
2267 dput(mntroot);
2268 mntroot = ERR_PTR(error);
2269 error_splat_super:
2270 if (server && !s->s_root)
2271 bdi_unregister(&server->backing_dev_info);
2272 error_splat_bdi:
2273 deactivate_locked_super(s);
2274 goto out;
2275 }
2276
2277 /*
2278 * Ensure that we unregister the bdi before kill_anon_super
2279 * releases the device name
2280 */
2281 static void nfs_put_super(struct super_block *s)
2282 {
2283 struct nfs_server *server = NFS_SB(s);
2284
2285 bdi_unregister(&server->backing_dev_info);
2286 }
2287
2288 /*
2289 * Destroy an NFS2/3 superblock
2290 */
2291 static void nfs_kill_super(struct super_block *s)
2292 {
2293 struct nfs_server *server = NFS_SB(s);
2294
2295 kill_anon_super(s);
2296 nfs_fscache_release_super_cookie(s);
2297 nfs_free_server(server);
2298 }
2299
2300 /*
2301 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2302 */
2303 static struct dentry *
2304 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2305 const char *dev_name, void *raw_data)
2306 {
2307 struct nfs_clone_mount *data = raw_data;
2308 struct super_block *s;
2309 struct nfs_server *server;
2310 struct dentry *mntroot;
2311 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2312 struct nfs_sb_mountdata sb_mntdata = {
2313 .mntflags = flags,
2314 };
2315 int error;
2316
2317 dprintk("--> nfs_xdev_mount()\n");
2318
2319 /* create a new volume representation */
2320 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2321 if (IS_ERR(server)) {
2322 error = PTR_ERR(server);
2323 goto out_err_noserver;
2324 }
2325 sb_mntdata.server = server;
2326
2327 if (server->flags & NFS_MOUNT_UNSHARED)
2328 compare_super = NULL;
2329
2330 /* Get a superblock - note that we may end up sharing one that already exists */
2331 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2332 if (IS_ERR(s)) {
2333 error = PTR_ERR(s);
2334 goto out_err_nosb;
2335 }
2336
2337 if (s->s_fs_info != server) {
2338 nfs_free_server(server);
2339 server = NULL;
2340 } else {
2341 error = nfs_bdi_register(server);
2342 if (error)
2343 goto error_splat_bdi;
2344 }
2345
2346 if (!s->s_root) {
2347 /* initial superblock/root creation */
2348 nfs_clone_super(s, data->sb);
2349 nfs_fscache_get_super_cookie(s, NULL, data);
2350 }
2351
2352 mntroot = nfs_get_root(s, data->fh, dev_name);
2353 if (IS_ERR(mntroot)) {
2354 error = PTR_ERR(mntroot);
2355 goto error_splat_super;
2356 }
2357 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2358 dput(mntroot);
2359 error = -ESTALE;
2360 goto error_splat_super;
2361 }
2362
2363 s->s_flags |= MS_ACTIVE;
2364
2365 /* clone any lsm security options from the parent to the new sb */
2366 security_sb_clone_mnt_opts(data->sb, s);
2367
2368 dprintk("<-- nfs_xdev_mount() = 0\n");
2369 return mntroot;
2370
2371 out_err_nosb:
2372 nfs_free_server(server);
2373 out_err_noserver:
2374 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2375 return ERR_PTR(error);
2376
2377 error_splat_super:
2378 if (server && !s->s_root)
2379 bdi_unregister(&server->backing_dev_info);
2380 error_splat_bdi:
2381 deactivate_locked_super(s);
2382 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2383 return ERR_PTR(error);
2384 }
2385
2386 #ifdef CONFIG_NFS_V4
2387
2388 /*
2389 * Finish setting up a cloned NFS4 superblock
2390 */
2391 static void nfs4_clone_super(struct super_block *sb,
2392 const struct super_block *old_sb)
2393 {
2394 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2395 sb->s_blocksize = old_sb->s_blocksize;
2396 sb->s_maxbytes = old_sb->s_maxbytes;
2397 sb->s_time_gran = 1;
2398 sb->s_op = old_sb->s_op;
2399 /*
2400 * The VFS shouldn't apply the umask to mode bits. We will do
2401 * so ourselves when necessary.
2402 */
2403 sb->s_flags |= MS_POSIXACL;
2404 sb->s_xattr = old_sb->s_xattr;
2405 nfs_initialise_sb(sb);
2406 }
2407
2408 /*
2409 * Set up an NFS4 superblock
2410 */
2411 static void nfs4_fill_super(struct super_block *sb)
2412 {
2413 sb->s_time_gran = 1;
2414 sb->s_op = &nfs4_sops;
2415 /*
2416 * The VFS shouldn't apply the umask to mode bits. We will do
2417 * so ourselves when necessary.
2418 */
2419 sb->s_flags |= MS_POSIXACL;
2420 sb->s_xattr = nfs4_xattr_handlers;
2421 nfs_initialise_sb(sb);
2422 }
2423
2424 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2425 {
2426 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2427 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2428 }
2429
2430 static int nfs4_validate_text_mount_data(void *options,
2431 struct nfs_parsed_mount_data *args,
2432 const char *dev_name)
2433 {
2434 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2435
2436 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2437
2438 nfs_validate_transport_protocol(args);
2439
2440 nfs4_validate_mount_flags(args);
2441
2442 if (args->version != 4) {
2443 dfprintk(MOUNT,
2444 "NFS4: Illegal mount version\n");
2445 return -EINVAL;
2446 }
2447
2448 if (args->auth_flavor_len > 1) {
2449 dfprintk(MOUNT,
2450 "NFS4: Too many RPC auth flavours specified\n");
2451 return -EINVAL;
2452 }
2453
2454 if (args->client_address == NULL) {
2455 dfprintk(MOUNT,
2456 "NFS4: mount program didn't pass callback address\n");
2457 return -EINVAL;
2458 }
2459
2460 return nfs_parse_devname(dev_name,
2461 &args->nfs_server.hostname,
2462 NFS4_MAXNAMLEN,
2463 &args->nfs_server.export_path,
2464 NFS4_MAXPATHLEN);
2465 }
2466
2467 /*
2468 * Validate NFSv4 mount options
2469 */
2470 static int nfs4_validate_mount_data(void *options,
2471 struct nfs_parsed_mount_data *args,
2472 const char *dev_name)
2473 {
2474 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2475 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2476 char *c;
2477
2478 if (data == NULL)
2479 goto out_no_data;
2480
2481 switch (data->version) {
2482 case 1:
2483 if (data->host_addrlen > sizeof(args->nfs_server.address))
2484 goto out_no_address;
2485 if (data->host_addrlen == 0)
2486 goto out_no_address;
2487 args->nfs_server.addrlen = data->host_addrlen;
2488 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2489 return -EFAULT;
2490 if (!nfs_verify_server_address(sap))
2491 goto out_no_address;
2492
2493 if (data->auth_flavourlen) {
2494 if (data->auth_flavourlen > 1)
2495 goto out_inval_auth;
2496 if (copy_from_user(&args->auth_flavors[0],
2497 data->auth_flavours,
2498 sizeof(args->auth_flavors[0])))
2499 return -EFAULT;
2500 }
2501
2502 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2503 if (IS_ERR(c))
2504 return PTR_ERR(c);
2505 args->nfs_server.hostname = c;
2506
2507 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2508 if (IS_ERR(c))
2509 return PTR_ERR(c);
2510 args->nfs_server.export_path = c;
2511 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2512
2513 c = strndup_user(data->client_addr.data, 16);
2514 if (IS_ERR(c))
2515 return PTR_ERR(c);
2516 args->client_address = c;
2517
2518 /*
2519 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2520 * can deal with.
2521 */
2522
2523 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2524 args->rsize = data->rsize;
2525 args->wsize = data->wsize;
2526 args->timeo = data->timeo;
2527 args->retrans = data->retrans;
2528 args->acregmin = data->acregmin;
2529 args->acregmax = data->acregmax;
2530 args->acdirmin = data->acdirmin;
2531 args->acdirmax = data->acdirmax;
2532 args->nfs_server.protocol = data->proto;
2533 nfs_validate_transport_protocol(args);
2534
2535 break;
2536 default:
2537 if (nfs_parse_mount_options((char *)options, args) == 0)
2538 return -EINVAL;
2539
2540 if (!nfs_verify_server_address(sap))
2541 return -EINVAL;
2542
2543 return nfs4_validate_text_mount_data(options, args, dev_name);
2544 }
2545
2546 return 0;
2547
2548 out_no_data:
2549 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2550 return -EINVAL;
2551
2552 out_inval_auth:
2553 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2554 data->auth_flavourlen);
2555 return -EINVAL;
2556
2557 out_no_address:
2558 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2559 return -EINVAL;
2560 }
2561
2562 /*
2563 * Get the superblock for the NFS4 root partition
2564 */
2565 static struct dentry *
2566 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2567 const char *dev_name, void *raw_data)
2568 {
2569 struct nfs_parsed_mount_data *data = raw_data;
2570 struct super_block *s;
2571 struct nfs_server *server;
2572 struct nfs_fh *mntfh;
2573 struct dentry *mntroot;
2574 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2575 struct nfs_sb_mountdata sb_mntdata = {
2576 .mntflags = flags,
2577 };
2578 int error = -ENOMEM;
2579
2580 mntfh = nfs_alloc_fhandle();
2581 if (data == NULL || mntfh == NULL)
2582 goto out_free_fh;
2583
2584 security_init_mnt_opts(&data->lsm_opts);
2585
2586 /* Get a volume representation */
2587 server = nfs4_create_server(data, mntfh);
2588 if (IS_ERR(server)) {
2589 error = PTR_ERR(server);
2590 goto out;
2591 }
2592 sb_mntdata.server = server;
2593
2594 if (server->flags & NFS4_MOUNT_UNSHARED)
2595 compare_super = NULL;
2596
2597 /* Get a superblock - note that we may end up sharing one that already exists */
2598 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2599 if (IS_ERR(s)) {
2600 error = PTR_ERR(s);
2601 goto out_free;
2602 }
2603
2604 if (s->s_fs_info != server) {
2605 nfs_free_server(server);
2606 server = NULL;
2607 } else {
2608 error = nfs_bdi_register(server);
2609 if (error)
2610 goto error_splat_bdi;
2611 }
2612
2613 if (!s->s_root) {
2614 /* initial superblock/root creation */
2615 nfs4_fill_super(s);
2616 nfs_fscache_get_super_cookie(
2617 s, data ? data->fscache_uniq : NULL, NULL);
2618 }
2619
2620 mntroot = nfs4_get_root(s, mntfh, dev_name);
2621 if (IS_ERR(mntroot)) {
2622 error = PTR_ERR(mntroot);
2623 goto error_splat_super;
2624 }
2625
2626 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2627 if (error)
2628 goto error_splat_root;
2629
2630 s->s_flags |= MS_ACTIVE;
2631
2632 security_free_mnt_opts(&data->lsm_opts);
2633 nfs_free_fhandle(mntfh);
2634 return mntroot;
2635
2636 out:
2637 security_free_mnt_opts(&data->lsm_opts);
2638 out_free_fh:
2639 nfs_free_fhandle(mntfh);
2640 return ERR_PTR(error);
2641
2642 out_free:
2643 nfs_free_server(server);
2644 goto out;
2645
2646 error_splat_root:
2647 dput(mntroot);
2648 error_splat_super:
2649 if (server && !s->s_root)
2650 bdi_unregister(&server->backing_dev_info);
2651 error_splat_bdi:
2652 deactivate_locked_super(s);
2653 goto out;
2654 }
2655
2656 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2657 int flags, void *data, const char *hostname)
2658 {
2659 struct vfsmount *root_mnt;
2660 char *root_devname;
2661 size_t len;
2662
2663 len = strlen(hostname) + 3;
2664 root_devname = kmalloc(len, GFP_KERNEL);
2665 if (root_devname == NULL)
2666 return ERR_PTR(-ENOMEM);
2667 snprintf(root_devname, len, "%s:/", hostname);
2668 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2669 kfree(root_devname);
2670 return root_mnt;
2671 }
2672
2673 struct nfs_referral_count {
2674 struct list_head list;
2675 const struct task_struct *task;
2676 unsigned int referral_count;
2677 };
2678
2679 static LIST_HEAD(nfs_referral_count_list);
2680 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2681
2682 static struct nfs_referral_count *nfs_find_referral_count(void)
2683 {
2684 struct nfs_referral_count *p;
2685
2686 list_for_each_entry(p, &nfs_referral_count_list, list) {
2687 if (p->task == current)
2688 return p;
2689 }
2690 return NULL;
2691 }
2692
2693 #define NFS_MAX_NESTED_REFERRALS 2
2694
2695 static int nfs_referral_loop_protect(void)
2696 {
2697 struct nfs_referral_count *p, *new;
2698 int ret = -ENOMEM;
2699
2700 new = kmalloc(sizeof(*new), GFP_KERNEL);
2701 if (!new)
2702 goto out;
2703 new->task = current;
2704 new->referral_count = 1;
2705
2706 ret = 0;
2707 spin_lock(&nfs_referral_count_list_lock);
2708 p = nfs_find_referral_count();
2709 if (p != NULL) {
2710 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2711 ret = -ELOOP;
2712 else
2713 p->referral_count++;
2714 } else {
2715 list_add(&new->list, &nfs_referral_count_list);
2716 new = NULL;
2717 }
2718 spin_unlock(&nfs_referral_count_list_lock);
2719 kfree(new);
2720 out:
2721 return ret;
2722 }
2723
2724 static void nfs_referral_loop_unprotect(void)
2725 {
2726 struct nfs_referral_count *p;
2727
2728 spin_lock(&nfs_referral_count_list_lock);
2729 p = nfs_find_referral_count();
2730 p->referral_count--;
2731 if (p->referral_count == 0)
2732 list_del(&p->list);
2733 else
2734 p = NULL;
2735 spin_unlock(&nfs_referral_count_list_lock);
2736 kfree(p);
2737 }
2738
2739 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2740 const char *export_path)
2741 {
2742 struct nameidata *nd = NULL;
2743 struct mnt_namespace *ns_private;
2744 struct super_block *s;
2745 struct dentry *dentry;
2746 int ret;
2747
2748 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2749 if (nd == NULL)
2750 return ERR_PTR(-ENOMEM);
2751
2752 ns_private = create_mnt_ns(root_mnt);
2753 ret = PTR_ERR(ns_private);
2754 if (IS_ERR(ns_private))
2755 goto out_mntput;
2756
2757 ret = nfs_referral_loop_protect();
2758 if (ret != 0)
2759 goto out_put_mnt_ns;
2760
2761 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2762 export_path, LOOKUP_FOLLOW, nd);
2763
2764 nfs_referral_loop_unprotect();
2765 put_mnt_ns(ns_private);
2766
2767 if (ret != 0)
2768 goto out_err;
2769
2770 s = nd->path.mnt->mnt_sb;
2771 atomic_inc(&s->s_active);
2772 dentry = dget(nd->path.dentry);
2773
2774 path_put(&nd->path);
2775 kfree(nd);
2776 down_write(&s->s_umount);
2777 return dentry;
2778 out_put_mnt_ns:
2779 put_mnt_ns(ns_private);
2780 out_mntput:
2781 mntput(root_mnt);
2782 out_err:
2783 kfree(nd);
2784 return ERR_PTR(ret);
2785 }
2786
2787 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2788 struct nfs_parsed_mount_data *data)
2789 {
2790 char *export_path;
2791 struct vfsmount *root_mnt;
2792 struct dentry *res;
2793
2794 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2795
2796 export_path = data->nfs_server.export_path;
2797 data->nfs_server.export_path = "/";
2798 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2799 data->nfs_server.hostname);
2800 data->nfs_server.export_path = export_path;
2801
2802 res = ERR_CAST(root_mnt);
2803 if (!IS_ERR(root_mnt))
2804 res = nfs_follow_remote_path(root_mnt, export_path);
2805
2806 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2807 IS_ERR(res) ? PTR_ERR(res) : 0,
2808 IS_ERR(res) ? " [error]" : "");
2809 return res;
2810 }
2811
2812 /*
2813 * Get the superblock for an NFS4 mountpoint
2814 */
2815 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2816 int flags, const char *dev_name, void *raw_data)
2817 {
2818 struct nfs_parsed_mount_data *data;
2819 int error = -ENOMEM;
2820 struct dentry *res = ERR_PTR(-ENOMEM);
2821
2822 data = nfs_alloc_parsed_mount_data(4);
2823 if (data == NULL)
2824 goto out_free_data;
2825
2826 /* Validate the mount data */
2827 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2828 if (error < 0) {
2829 res = ERR_PTR(error);
2830 goto out;
2831 }
2832
2833 res = nfs4_try_mount(flags, dev_name, data);
2834 if (IS_ERR(res))
2835 error = PTR_ERR(res);
2836
2837 out:
2838 kfree(data->client_address);
2839 kfree(data->nfs_server.export_path);
2840 kfree(data->nfs_server.hostname);
2841 kfree(data->fscache_uniq);
2842 out_free_data:
2843 kfree(data);
2844 dprintk("<-- nfs4_mount() = %d%s\n", error,
2845 error != 0 ? " [error]" : "");
2846 return res;
2847 }
2848
2849 static void nfs4_kill_super(struct super_block *sb)
2850 {
2851 struct nfs_server *server = NFS_SB(sb);
2852
2853 dprintk("--> %s\n", __func__);
2854 nfs_super_return_all_delegations(sb);
2855 kill_anon_super(sb);
2856 nfs_fscache_release_super_cookie(sb);
2857 nfs_free_server(server);
2858 dprintk("<-- %s\n", __func__);
2859 }
2860
2861 /*
2862 * Clone an NFS4 server record on xdev traversal (FSID-change)
2863 */
2864 static struct dentry *
2865 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2866 const char *dev_name, void *raw_data)
2867 {
2868 struct nfs_clone_mount *data = raw_data;
2869 struct super_block *s;
2870 struct nfs_server *server;
2871 struct dentry *mntroot;
2872 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2873 struct nfs_sb_mountdata sb_mntdata = {
2874 .mntflags = flags,
2875 };
2876 int error;
2877
2878 dprintk("--> nfs4_xdev_mount()\n");
2879
2880 /* create a new volume representation */
2881 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2882 if (IS_ERR(server)) {
2883 error = PTR_ERR(server);
2884 goto out_err_noserver;
2885 }
2886 sb_mntdata.server = server;
2887
2888 if (server->flags & NFS4_MOUNT_UNSHARED)
2889 compare_super = NULL;
2890
2891 /* Get a superblock - note that we may end up sharing one that already exists */
2892 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2893 if (IS_ERR(s)) {
2894 error = PTR_ERR(s);
2895 goto out_err_nosb;
2896 }
2897
2898 if (s->s_fs_info != server) {
2899 nfs_free_server(server);
2900 server = NULL;
2901 } else {
2902 error = nfs_bdi_register(server);
2903 if (error)
2904 goto error_splat_bdi;
2905 }
2906
2907 if (!s->s_root) {
2908 /* initial superblock/root creation */
2909 nfs4_clone_super(s, data->sb);
2910 nfs_fscache_get_super_cookie(s, NULL, data);
2911 }
2912
2913 mntroot = nfs4_get_root(s, data->fh, dev_name);
2914 if (IS_ERR(mntroot)) {
2915 error = PTR_ERR(mntroot);
2916 goto error_splat_super;
2917 }
2918 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2919 dput(mntroot);
2920 error = -ESTALE;
2921 goto error_splat_super;
2922 }
2923
2924 s->s_flags |= MS_ACTIVE;
2925
2926 security_sb_clone_mnt_opts(data->sb, s);
2927
2928 dprintk("<-- nfs4_xdev_mount() = 0\n");
2929 return mntroot;
2930
2931 out_err_nosb:
2932 nfs_free_server(server);
2933 out_err_noserver:
2934 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2935 return ERR_PTR(error);
2936
2937 error_splat_super:
2938 if (server && !s->s_root)
2939 bdi_unregister(&server->backing_dev_info);
2940 error_splat_bdi:
2941 deactivate_locked_super(s);
2942 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2943 return ERR_PTR(error);
2944 }
2945
2946 static struct dentry *
2947 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2948 const char *dev_name, void *raw_data)
2949 {
2950 struct nfs_clone_mount *data = raw_data;
2951 struct super_block *s;
2952 struct nfs_server *server;
2953 struct dentry *mntroot;
2954 struct nfs_fh *mntfh;
2955 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2956 struct nfs_sb_mountdata sb_mntdata = {
2957 .mntflags = flags,
2958 };
2959 int error = -ENOMEM;
2960
2961 dprintk("--> nfs4_referral_get_sb()\n");
2962
2963 mntfh = nfs_alloc_fhandle();
2964 if (mntfh == NULL)
2965 goto out_err_nofh;
2966
2967 /* create a new volume representation */
2968 server = nfs4_create_referral_server(data, mntfh);
2969 if (IS_ERR(server)) {
2970 error = PTR_ERR(server);
2971 goto out_err_noserver;
2972 }
2973 sb_mntdata.server = server;
2974
2975 if (server->flags & NFS4_MOUNT_UNSHARED)
2976 compare_super = NULL;
2977
2978 /* Get a superblock - note that we may end up sharing one that already exists */
2979 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2980 if (IS_ERR(s)) {
2981 error = PTR_ERR(s);
2982 goto out_err_nosb;
2983 }
2984
2985 if (s->s_fs_info != server) {
2986 nfs_free_server(server);
2987 server = NULL;
2988 } else {
2989 error = nfs_bdi_register(server);
2990 if (error)
2991 goto error_splat_bdi;
2992 }
2993
2994 if (!s->s_root) {
2995 /* initial superblock/root creation */
2996 nfs4_fill_super(s);
2997 nfs_fscache_get_super_cookie(s, NULL, data);
2998 }
2999
3000 mntroot = nfs4_get_root(s, mntfh, dev_name);
3001 if (IS_ERR(mntroot)) {
3002 error = PTR_ERR(mntroot);
3003 goto error_splat_super;
3004 }
3005 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3006 dput(mntroot);
3007 error = -ESTALE;
3008 goto error_splat_super;
3009 }
3010
3011 s->s_flags |= MS_ACTIVE;
3012
3013 security_sb_clone_mnt_opts(data->sb, s);
3014
3015 nfs_free_fhandle(mntfh);
3016 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3017 return mntroot;
3018
3019 out_err_nosb:
3020 nfs_free_server(server);
3021 out_err_noserver:
3022 nfs_free_fhandle(mntfh);
3023 out_err_nofh:
3024 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3025 return ERR_PTR(error);
3026
3027 error_splat_super:
3028 if (server && !s->s_root)
3029 bdi_unregister(&server->backing_dev_info);
3030 error_splat_bdi:
3031 deactivate_locked_super(s);
3032 nfs_free_fhandle(mntfh);
3033 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3034 return ERR_PTR(error);
3035 }
3036
3037 /*
3038 * Create an NFS4 server record on referral traversal
3039 */
3040 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3041 int flags, const char *dev_name, void *raw_data)
3042 {
3043 struct nfs_clone_mount *data = raw_data;
3044 char *export_path;
3045 struct vfsmount *root_mnt;
3046 struct dentry *res;
3047
3048 dprintk("--> nfs4_referral_mount()\n");
3049
3050 export_path = data->mnt_path;
3051 data->mnt_path = "/";
3052
3053 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3054 flags, data, data->hostname);
3055 data->mnt_path = export_path;
3056
3057 res = ERR_CAST(root_mnt);
3058 if (!IS_ERR(root_mnt))
3059 res = nfs_follow_remote_path(root_mnt, export_path);
3060 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3061 IS_ERR(res) ? PTR_ERR(res) : 0,
3062 IS_ERR(res) ? " [error]" : "");
3063 return res;
3064 }
3065
3066 #endif /* CONFIG_NFS_V4 */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree