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nfs: don't lose MS_SYNCHRONOUS on remount of noac mount
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / super.c
blobe288f06d3fa7de5f6d06e134b1854230aa9b7611
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->flags |= NFS_MOUNT_SECFLAVOUR;
1008 mnt->auth_flavor_len = 1;
1009 return 1;
1010 }
1011
1012 static int nfs_get_option_str(substring_t args[], char **option)
1013 {
1014 kfree(*option);
1015 *option = match_strdup(args);
1016 return !option;
1017 }
1018
1019 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1020 {
1021 int rc;
1022 char *string;
1023
1024 string = match_strdup(args);
1025 if (string == NULL)
1026 return -ENOMEM;
1027 rc = strict_strtoul(string, 10, option);
1028 kfree(string);
1029
1030 return rc;
1031 }
1032
1033 /*
1034 * Error-check and convert a string of mount options from user space into
1035 * a data structure. The whole mount string is processed; bad options are
1036 * skipped as they are encountered. If there were no errors, return 1;
1037 * otherwise return 0 (zero).
1038 */
1039 static int nfs_parse_mount_options(char *raw,
1040 struct nfs_parsed_mount_data *mnt)
1041 {
1042 char *p, *string, *secdata;
1043 int rc, sloppy = 0, invalid_option = 0;
1044 unsigned short protofamily = AF_UNSPEC;
1045 unsigned short mountfamily = AF_UNSPEC;
1046
1047 if (!raw) {
1048 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1049 return 1;
1050 }
1051 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1052
1053 secdata = alloc_secdata();
1054 if (!secdata)
1055 goto out_nomem;
1056
1057 rc = security_sb_copy_data(raw, secdata);
1058 if (rc)
1059 goto out_security_failure;
1060
1061 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1062 if (rc)
1063 goto out_security_failure;
1064
1065 free_secdata(secdata);
1066
1067 while ((p = strsep(&raw, ",")) != NULL) {
1068 substring_t args[MAX_OPT_ARGS];
1069 unsigned long option;
1070 int token;
1071
1072 if (!*p)
1073 continue;
1074
1075 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1076
1077 token = match_token(p, nfs_mount_option_tokens, args);
1078 switch (token) {
1079
1080 /*
1081 * boolean options: foo/nofoo
1082 */
1083 case Opt_soft:
1084 mnt->flags |= NFS_MOUNT_SOFT;
1085 break;
1086 case Opt_hard:
1087 mnt->flags &= ~NFS_MOUNT_SOFT;
1088 break;
1089 case Opt_posix:
1090 mnt->flags |= NFS_MOUNT_POSIX;
1091 break;
1092 case Opt_noposix:
1093 mnt->flags &= ~NFS_MOUNT_POSIX;
1094 break;
1095 case Opt_cto:
1096 mnt->flags &= ~NFS_MOUNT_NOCTO;
1097 break;
1098 case Opt_nocto:
1099 mnt->flags |= NFS_MOUNT_NOCTO;
1100 break;
1101 case Opt_ac:
1102 mnt->flags &= ~NFS_MOUNT_NOAC;
1103 break;
1104 case Opt_noac:
1105 mnt->flags |= NFS_MOUNT_NOAC;
1106 break;
1107 case Opt_lock:
1108 mnt->flags &= ~NFS_MOUNT_NONLM;
1109 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1110 NFS_MOUNT_LOCAL_FCNTL);
1111 break;
1112 case Opt_nolock:
1113 mnt->flags |= NFS_MOUNT_NONLM;
1114 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1115 NFS_MOUNT_LOCAL_FCNTL);
1116 break;
1117 case Opt_v2:
1118 mnt->flags &= ~NFS_MOUNT_VER3;
1119 mnt->version = 2;
1120 break;
1121 case Opt_v3:
1122 mnt->flags |= NFS_MOUNT_VER3;
1123 mnt->version = 3;
1124 break;
1125 case Opt_v4:
1126 mnt->flags &= ~NFS_MOUNT_VER3;
1127 mnt->version = 4;
1128 break;
1129 case Opt_udp:
1130 mnt->flags &= ~NFS_MOUNT_TCP;
1131 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1132 break;
1133 case Opt_tcp:
1134 mnt->flags |= NFS_MOUNT_TCP;
1135 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1136 break;
1137 case Opt_rdma:
1138 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1139 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1140 xprt_load_transport(p);
1141 break;
1142 case Opt_acl:
1143 mnt->flags &= ~NFS_MOUNT_NOACL;
1144 break;
1145 case Opt_noacl:
1146 mnt->flags |= NFS_MOUNT_NOACL;
1147 break;
1148 case Opt_rdirplus:
1149 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1150 break;
1151 case Opt_nordirplus:
1152 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1153 break;
1154 case Opt_sharecache:
1155 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1156 break;
1157 case Opt_nosharecache:
1158 mnt->flags |= NFS_MOUNT_UNSHARED;
1159 break;
1160 case Opt_resvport:
1161 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1162 break;
1163 case Opt_noresvport:
1164 mnt->flags |= NFS_MOUNT_NORESVPORT;
1165 break;
1166 case Opt_fscache:
1167 mnt->options |= NFS_OPTION_FSCACHE;
1168 kfree(mnt->fscache_uniq);
1169 mnt->fscache_uniq = NULL;
1170 break;
1171 case Opt_nofscache:
1172 mnt->options &= ~NFS_OPTION_FSCACHE;
1173 kfree(mnt->fscache_uniq);
1174 mnt->fscache_uniq = NULL;
1175 break;
1176
1177 /*
1178 * options that take numeric values
1179 */
1180 case Opt_port:
1181 if (nfs_get_option_ul(args, &option) ||
1182 option > USHRT_MAX)
1183 goto out_invalid_value;
1184 mnt->nfs_server.port = option;
1185 break;
1186 case Opt_rsize:
1187 if (nfs_get_option_ul(args, &option))
1188 goto out_invalid_value;
1189 mnt->rsize = option;
1190 break;
1191 case Opt_wsize:
1192 if (nfs_get_option_ul(args, &option))
1193 goto out_invalid_value;
1194 mnt->wsize = option;
1195 break;
1196 case Opt_bsize:
1197 if (nfs_get_option_ul(args, &option))
1198 goto out_invalid_value;
1199 mnt->bsize = option;
1200 break;
1201 case Opt_timeo:
1202 if (nfs_get_option_ul(args, &option) || option == 0)
1203 goto out_invalid_value;
1204 mnt->timeo = option;
1205 break;
1206 case Opt_retrans:
1207 if (nfs_get_option_ul(args, &option) || option == 0)
1208 goto out_invalid_value;
1209 mnt->retrans = option;
1210 break;
1211 case Opt_acregmin:
1212 if (nfs_get_option_ul(args, &option))
1213 goto out_invalid_value;
1214 mnt->acregmin = option;
1215 break;
1216 case Opt_acregmax:
1217 if (nfs_get_option_ul(args, &option))
1218 goto out_invalid_value;
1219 mnt->acregmax = option;
1220 break;
1221 case Opt_acdirmin:
1222 if (nfs_get_option_ul(args, &option))
1223 goto out_invalid_value;
1224 mnt->acdirmin = option;
1225 break;
1226 case Opt_acdirmax:
1227 if (nfs_get_option_ul(args, &option))
1228 goto out_invalid_value;
1229 mnt->acdirmax = option;
1230 break;
1231 case Opt_actimeo:
1232 if (nfs_get_option_ul(args, &option))
1233 goto out_invalid_value;
1234 mnt->acregmin = mnt->acregmax =
1235 mnt->acdirmin = mnt->acdirmax = option;
1236 break;
1237 case Opt_namelen:
1238 if (nfs_get_option_ul(args, &option))
1239 goto out_invalid_value;
1240 mnt->namlen = option;
1241 break;
1242 case Opt_mountport:
1243 if (nfs_get_option_ul(args, &option) ||
1244 option > USHRT_MAX)
1245 goto out_invalid_value;
1246 mnt->mount_server.port = option;
1247 break;
1248 case Opt_mountvers:
1249 if (nfs_get_option_ul(args, &option) ||
1250 option < NFS_MNT_VERSION ||
1251 option > NFS_MNT3_VERSION)
1252 goto out_invalid_value;
1253 mnt->mount_server.version = option;
1254 break;
1255 case Opt_nfsvers:
1256 if (nfs_get_option_ul(args, &option))
1257 goto out_invalid_value;
1258 switch (option) {
1259 case NFS2_VERSION:
1260 mnt->flags &= ~NFS_MOUNT_VER3;
1261 mnt->version = 2;
1262 break;
1263 case NFS3_VERSION:
1264 mnt->flags |= NFS_MOUNT_VER3;
1265 mnt->version = 3;
1266 break;
1267 case NFS4_VERSION:
1268 mnt->flags &= ~NFS_MOUNT_VER3;
1269 mnt->version = 4;
1270 break;
1271 default:
1272 goto out_invalid_value;
1273 }
1274 break;
1275 case Opt_minorversion:
1276 if (nfs_get_option_ul(args, &option))
1277 goto out_invalid_value;
1278 if (option > NFS4_MAX_MINOR_VERSION)
1279 goto out_invalid_value;
1280 mnt->minorversion = option;
1281 break;
1282
1283 /*
1284 * options that take text values
1285 */
1286 case Opt_sec:
1287 string = match_strdup(args);
1288 if (string == NULL)
1289 goto out_nomem;
1290 rc = nfs_parse_security_flavors(string, mnt);
1291 kfree(string);
1292 if (!rc) {
1293 dfprintk(MOUNT, "NFS: unrecognized "
1294 "security flavor\n");
1295 return 0;
1296 }
1297 break;
1298 case Opt_proto:
1299 string = match_strdup(args);
1300 if (string == NULL)
1301 goto out_nomem;
1302 token = match_token(string,
1303 nfs_xprt_protocol_tokens, args);
1304
1305 protofamily = AF_INET;
1306 switch (token) {
1307 case Opt_xprt_udp6:
1308 protofamily = AF_INET6;
1309 case Opt_xprt_udp:
1310 mnt->flags &= ~NFS_MOUNT_TCP;
1311 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1312 break;
1313 case Opt_xprt_tcp6:
1314 protofamily = AF_INET6;
1315 case Opt_xprt_tcp:
1316 mnt->flags |= NFS_MOUNT_TCP;
1317 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1318 break;
1319 case Opt_xprt_rdma:
1320 /* vector side protocols to TCP */
1321 mnt->flags |= NFS_MOUNT_TCP;
1322 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1323 xprt_load_transport(string);
1324 break;
1325 default:
1326 dfprintk(MOUNT, "NFS: unrecognized "
1327 "transport protocol\n");
1328 kfree(string);
1329 return 0;
1330 }
1331 kfree(string);
1332 break;
1333 case Opt_mountproto:
1334 string = match_strdup(args);
1335 if (string == NULL)
1336 goto out_nomem;
1337 token = match_token(string,
1338 nfs_xprt_protocol_tokens, args);
1339 kfree(string);
1340
1341 mountfamily = AF_INET;
1342 switch (token) {
1343 case Opt_xprt_udp6:
1344 mountfamily = AF_INET6;
1345 case Opt_xprt_udp:
1346 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1347 break;
1348 case Opt_xprt_tcp6:
1349 mountfamily = AF_INET6;
1350 case Opt_xprt_tcp:
1351 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1352 break;
1353 case Opt_xprt_rdma: /* not used for side protocols */
1354 default:
1355 dfprintk(MOUNT, "NFS: unrecognized "
1356 "transport protocol\n");
1357 return 0;
1358 }
1359 break;
1360 case Opt_addr:
1361 string = match_strdup(args);
1362 if (string == NULL)
1363 goto out_nomem;
1364 mnt->nfs_server.addrlen =
1365 rpc_pton(string, strlen(string),
1366 (struct sockaddr *)
1367 &mnt->nfs_server.address,
1368 sizeof(mnt->nfs_server.address));
1369 kfree(string);
1370 if (mnt->nfs_server.addrlen == 0)
1371 goto out_invalid_address;
1372 break;
1373 case Opt_clientaddr:
1374 if (nfs_get_option_str(args, &mnt->client_address))
1375 goto out_nomem;
1376 break;
1377 case Opt_mounthost:
1378 if (nfs_get_option_str(args,
1379 &mnt->mount_server.hostname))
1380 goto out_nomem;
1381 break;
1382 case Opt_mountaddr:
1383 string = match_strdup(args);
1384 if (string == NULL)
1385 goto out_nomem;
1386 mnt->mount_server.addrlen =
1387 rpc_pton(string, strlen(string),
1388 (struct sockaddr *)
1389 &mnt->mount_server.address,
1390 sizeof(mnt->mount_server.address));
1391 kfree(string);
1392 if (mnt->mount_server.addrlen == 0)
1393 goto out_invalid_address;
1394 break;
1395 case Opt_lookupcache:
1396 string = match_strdup(args);
1397 if (string == NULL)
1398 goto out_nomem;
1399 token = match_token(string,
1400 nfs_lookupcache_tokens, args);
1401 kfree(string);
1402 switch (token) {
1403 case Opt_lookupcache_all:
1404 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1405 break;
1406 case Opt_lookupcache_positive:
1407 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1408 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1409 break;
1410 case Opt_lookupcache_none:
1411 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1412 break;
1413 default:
1414 dfprintk(MOUNT, "NFS: invalid "
1415 "lookupcache argument\n");
1416 return 0;
1417 };
1418 break;
1419 case Opt_fscache_uniq:
1420 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1421 goto out_nomem;
1422 mnt->options |= NFS_OPTION_FSCACHE;
1423 break;
1424 case Opt_local_lock:
1425 string = match_strdup(args);
1426 if (string == NULL)
1427 goto out_nomem;
1428 token = match_token(string, nfs_local_lock_tokens,
1429 args);
1430 kfree(string);
1431 switch (token) {
1432 case Opt_local_lock_all:
1433 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1434 NFS_MOUNT_LOCAL_FCNTL);
1435 break;
1436 case Opt_local_lock_flock:
1437 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1438 break;
1439 case Opt_local_lock_posix:
1440 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1441 break;
1442 case Opt_local_lock_none:
1443 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1444 NFS_MOUNT_LOCAL_FCNTL);
1445 break;
1446 default:
1447 dfprintk(MOUNT, "NFS: invalid "
1448 "local_lock argument\n");
1449 return 0;
1450 };
1451 break;
1452
1453 /*
1454 * Special options
1455 */
1456 case Opt_sloppy:
1457 sloppy = 1;
1458 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1459 break;
1460 case Opt_userspace:
1461 case Opt_deprecated:
1462 dfprintk(MOUNT, "NFS: ignoring mount option "
1463 "'%s'\n", p);
1464 break;
1465
1466 default:
1467 invalid_option = 1;
1468 dfprintk(MOUNT, "NFS: unrecognized mount option "
1469 "'%s'\n", p);
1470 }
1471 }
1472
1473 if (!sloppy && invalid_option)
1474 return 0;
1475
1476 /*
1477 * verify that any proto=/mountproto= options match the address
1478 * familiies in the addr=/mountaddr= options.
1479 */
1480 if (protofamily != AF_UNSPEC &&
1481 protofamily != mnt->nfs_server.address.ss_family)
1482 goto out_proto_mismatch;
1483
1484 if (mountfamily != AF_UNSPEC) {
1485 if (mnt->mount_server.addrlen) {
1486 if (mountfamily != mnt->mount_server.address.ss_family)
1487 goto out_mountproto_mismatch;
1488 } else {
1489 if (mountfamily != mnt->nfs_server.address.ss_family)
1490 goto out_mountproto_mismatch;
1491 }
1492 }
1493
1494 return 1;
1495
1496 out_mountproto_mismatch:
1497 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1498 "option\n");
1499 return 0;
1500 out_proto_mismatch:
1501 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1502 return 0;
1503 out_invalid_address:
1504 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1505 return 0;
1506 out_invalid_value:
1507 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1508 return 0;
1509 out_nomem:
1510 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1511 return 0;
1512 out_security_failure:
1513 free_secdata(secdata);
1514 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1515 return 0;
1516 }
1517
1518 /*
1519 * Match the requested auth flavors with the list returned by
1520 * the server. Returns zero and sets the mount's authentication
1521 * flavor on success; returns -EACCES if server does not support
1522 * the requested flavor.
1523 */
1524 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1525 struct nfs_mount_request *request)
1526 {
1527 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1528
1529 /*
1530 * Certain releases of Linux's mountd return an empty
1531 * flavor list. To prevent behavioral regression with
1532 * these servers (ie. rejecting mounts that used to
1533 * succeed), revert to pre-2.6.32 behavior (no checking)
1534 * if the returned flavor list is empty.
1535 */
1536 if (server_authlist_len == 0)
1537 return 0;
1538
1539 /*
1540 * We avoid sophisticated negotiating here, as there are
1541 * plenty of cases where we can get it wrong, providing
1542 * either too little or too much security.
1543 *
1544 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1545 * flavor listed first. However, some servers list
1546 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1547 * preferred default, in args->auth_flavors[0] if user
1548 * didn't specify sec= mount option.
1549 */
1550 for (i = 0; i < args->auth_flavor_len; i++)
1551 for (j = 0; j < server_authlist_len; j++)
1552 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1553 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1554 request->auth_flavs[j]);
1555 args->auth_flavors[0] = request->auth_flavs[j];
1556 return 0;
1557 }
1558
1559 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1560 nfs_umount(request);
1561 return -EACCES;
1562 }
1563
1564 /*
1565 * Use the remote server's MOUNT service to request the NFS file handle
1566 * corresponding to the provided path.
1567 */
1568 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1569 struct nfs_fh *root_fh)
1570 {
1571 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1572 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1573 struct nfs_mount_request request = {
1574 .sap = (struct sockaddr *)
1575 &args->mount_server.address,
1576 .dirpath = args->nfs_server.export_path,
1577 .protocol = args->mount_server.protocol,
1578 .fh = root_fh,
1579 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1580 .auth_flav_len = &server_authlist_len,
1581 .auth_flavs = server_authlist,
1582 };
1583 int status;
1584
1585 if (args->mount_server.version == 0) {
1586 switch (args->version) {
1587 default:
1588 args->mount_server.version = NFS_MNT3_VERSION;
1589 break;
1590 case 2:
1591 args->mount_server.version = NFS_MNT_VERSION;
1592 }
1593 }
1594 request.version = args->mount_server.version;
1595
1596 if (args->mount_server.hostname)
1597 request.hostname = args->mount_server.hostname;
1598 else
1599 request.hostname = args->nfs_server.hostname;
1600
1601 /*
1602 * Construct the mount server's address.
1603 */
1604 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1605 memcpy(request.sap, &args->nfs_server.address,
1606 args->nfs_server.addrlen);
1607 args->mount_server.addrlen = args->nfs_server.addrlen;
1608 }
1609 request.salen = args->mount_server.addrlen;
1610 nfs_set_port(request.sap, &args->mount_server.port, 0);
1611
1612 /*
1613 * Now ask the mount server to map our export path
1614 * to a file handle.
1615 */
1616 status = nfs_mount(&request);
1617 if (status != 0) {
1618 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1619 request.hostname, status);
1620 return status;
1621 }
1622
1623 /*
1624 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1625 */
1626 if (args->mount_server.version != NFS_MNT3_VERSION)
1627 return 0;
1628 return nfs_walk_authlist(args, &request);
1629 }
1630
1631 /*
1632 * Split "dev_name" into "hostname:export_path".
1633 *
1634 * The leftmost colon demarks the split between the server's hostname
1635 * and the export path. If the hostname starts with a left square
1636 * bracket, then it may contain colons.
1637 *
1638 * Note: caller frees hostname and export path, even on error.
1639 */
1640 static int nfs_parse_devname(const char *dev_name,
1641 char **hostname, size_t maxnamlen,
1642 char **export_path, size_t maxpathlen)
1643 {
1644 size_t len;
1645 char *end;
1646
1647 /* Is the host name protected with square brakcets? */
1648 if (*dev_name == '[') {
1649 end = strchr(++dev_name, ']');
1650 if (end == NULL || end[1] != ':')
1651 goto out_bad_devname;
1652
1653 len = end - dev_name;
1654 end++;
1655 } else {
1656 char *comma;
1657
1658 end = strchr(dev_name, ':');
1659 if (end == NULL)
1660 goto out_bad_devname;
1661 len = end - dev_name;
1662
1663 /* kill possible hostname list: not supported */
1664 comma = strchr(dev_name, ',');
1665 if (comma != NULL && comma < end)
1666 *comma = 0;
1667 }
1668
1669 if (len > maxnamlen)
1670 goto out_hostname;
1671
1672 /* N.B. caller will free nfs_server.hostname in all cases */
1673 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1674 if (*hostname == NULL)
1675 goto out_nomem;
1676 len = strlen(++end);
1677 if (len > maxpathlen)
1678 goto out_path;
1679 *export_path = kstrndup(end, len, GFP_KERNEL);
1680 if (!*export_path)
1681 goto out_nomem;
1682
1683 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1684 return 0;
1685
1686 out_bad_devname:
1687 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1688 return -EINVAL;
1689
1690 out_nomem:
1691 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1692 return -ENOMEM;
1693
1694 out_hostname:
1695 dfprintk(MOUNT, "NFS: server hostname too long\n");
1696 return -ENAMETOOLONG;
1697
1698 out_path:
1699 dfprintk(MOUNT, "NFS: export pathname too long\n");
1700 return -ENAMETOOLONG;
1701 }
1702
1703 /*
1704 * Validate the NFS2/NFS3 mount data
1705 * - fills in the mount root filehandle
1706 *
1707 * For option strings, user space handles the following behaviors:
1708 *
1709 * + DNS: mapping server host name to IP address ("addr=" option)
1710 *
1711 * + failure mode: how to behave if a mount request can't be handled
1712 * immediately ("fg/bg" option)
1713 *
1714 * + retry: how often to retry a mount request ("retry=" option)
1715 *
1716 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1717 * mountproto=tcp after mountproto=udp, and so on
1718 */
1719 static int nfs_validate_mount_data(void *options,
1720 struct nfs_parsed_mount_data *args,
1721 struct nfs_fh *mntfh,
1722 const char *dev_name)
1723 {
1724 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1725 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1726
1727 if (data == NULL)
1728 goto out_no_data;
1729
1730 switch (data->version) {
1731 case 1:
1732 data->namlen = 0;
1733 case 2:
1734 data->bsize = 0;
1735 case 3:
1736 if (data->flags & NFS_MOUNT_VER3)
1737 goto out_no_v3;
1738 data->root.size = NFS2_FHSIZE;
1739 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1740 case 4:
1741 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1742 goto out_no_sec;
1743 case 5:
1744 memset(data->context, 0, sizeof(data->context));
1745 case 6:
1746 if (data->flags & NFS_MOUNT_VER3) {
1747 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1748 goto out_invalid_fh;
1749 mntfh->size = data->root.size;
1750 args->version = 3;
1751 } else {
1752 mntfh->size = NFS2_FHSIZE;
1753 args->version = 2;
1754 }
1755
1756
1757 memcpy(mntfh->data, data->root.data, mntfh->size);
1758 if (mntfh->size < sizeof(mntfh->data))
1759 memset(mntfh->data + mntfh->size, 0,
1760 sizeof(mntfh->data) - mntfh->size);
1761
1762 /*
1763 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1764 * can deal with.
1765 */
1766 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1767 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1768 args->rsize = data->rsize;
1769 args->wsize = data->wsize;
1770 args->timeo = data->timeo;
1771 args->retrans = data->retrans;
1772 args->acregmin = data->acregmin;
1773 args->acregmax = data->acregmax;
1774 args->acdirmin = data->acdirmin;
1775 args->acdirmax = data->acdirmax;
1776
1777 memcpy(sap, &data->addr, sizeof(data->addr));
1778 args->nfs_server.addrlen = sizeof(data->addr);
1779 if (!nfs_verify_server_address(sap))
1780 goto out_no_address;
1781
1782 if (!(data->flags & NFS_MOUNT_TCP))
1783 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1784 /* N.B. caller will free nfs_server.hostname in all cases */
1785 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1786 args->namlen = data->namlen;
1787 args->bsize = data->bsize;
1788
1789 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1790 args->auth_flavors[0] = data->pseudoflavor;
1791 if (!args->nfs_server.hostname)
1792 goto out_nomem;
1793
1794 if (!(data->flags & NFS_MOUNT_NONLM))
1795 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1796 NFS_MOUNT_LOCAL_FCNTL);
1797 else
1798 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1799 NFS_MOUNT_LOCAL_FCNTL);
1800 /*
1801 * The legacy version 6 binary mount data from userspace has a
1802 * field used only to transport selinux information into the
1803 * the kernel. To continue to support that functionality we
1804 * have a touch of selinux knowledge here in the NFS code. The
1805 * userspace code converted context=blah to just blah so we are
1806 * converting back to the full string selinux understands.
1807 */
1808 if (data->context[0]){
1809 #ifdef CONFIG_SECURITY_SELINUX
1810 int rc;
1811 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1812 if (!opts_str)
1813 return -ENOMEM;
1814 strcpy(opts_str, "context=");
1815 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1816 strcat(opts_str, &data->context[0]);
1817 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1818 kfree(opts_str);
1819 if (rc)
1820 return rc;
1821 #else
1822 return -EINVAL;
1823 #endif
1824 }
1825
1826 break;
1827 default: {
1828 int status;
1829
1830 if (nfs_parse_mount_options((char *)options, args) == 0)
1831 return -EINVAL;
1832
1833 if (!nfs_verify_server_address(sap))
1834 goto out_no_address;
1835
1836 if (args->version == 4)
1837 #ifdef CONFIG_NFS_V4
1838 return nfs4_validate_text_mount_data(options,
1839 args, dev_name);
1840 #else
1841 goto out_v4_not_compiled;
1842 #endif
1843
1844 nfs_set_port(sap, &args->nfs_server.port, 0);
1845
1846 nfs_set_mount_transport_protocol(args);
1847
1848 status = nfs_parse_devname(dev_name,
1849 &args->nfs_server.hostname,
1850 PAGE_SIZE,
1851 &args->nfs_server.export_path,
1852 NFS_MAXPATHLEN);
1853 if (!status)
1854 status = nfs_try_mount(args, mntfh);
1855
1856 kfree(args->nfs_server.export_path);
1857 args->nfs_server.export_path = NULL;
1858
1859 if (status)
1860 return status;
1861
1862 break;
1863 }
1864 }
1865
1866 #ifndef CONFIG_NFS_V3
1867 if (args->version == 3)
1868 goto out_v3_not_compiled;
1869 #endif /* !CONFIG_NFS_V3 */
1870
1871 return 0;
1872
1873 out_no_data:
1874 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1875 return -EINVAL;
1876
1877 out_no_v3:
1878 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1879 data->version);
1880 return -EINVAL;
1881
1882 out_no_sec:
1883 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1884 return -EINVAL;
1885
1886 #ifndef CONFIG_NFS_V3
1887 out_v3_not_compiled:
1888 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1889 return -EPROTONOSUPPORT;
1890 #endif /* !CONFIG_NFS_V3 */
1891
1892 #ifndef CONFIG_NFS_V4
1893 out_v4_not_compiled:
1894 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1895 return -EPROTONOSUPPORT;
1896 #endif /* !CONFIG_NFS_V4 */
1897
1898 out_nomem:
1899 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1900 return -ENOMEM;
1901
1902 out_no_address:
1903 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1904 return -EINVAL;
1905
1906 out_invalid_fh:
1907 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1908 return -EINVAL;
1909 }
1910
1911 static int
1912 nfs_compare_remount_data(struct nfs_server *nfss,
1913 struct nfs_parsed_mount_data *data)
1914 {
1915 if (data->flags != nfss->flags ||
1916 data->rsize != nfss->rsize ||
1917 data->wsize != nfss->wsize ||
1918 data->retrans != nfss->client->cl_timeout->to_retries ||
1919 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1920 data->acregmin != nfss->acregmin / HZ ||
1921 data->acregmax != nfss->acregmax / HZ ||
1922 data->acdirmin != nfss->acdirmin / HZ ||
1923 data->acdirmax != nfss->acdirmax / HZ ||
1924 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1925 data->nfs_server.port != nfss->port ||
1926 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1927 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1928 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1929 return -EINVAL;
1930
1931 return 0;
1932 }
1933
1934 static int
1935 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1936 {
1937 int error;
1938 struct nfs_server *nfss = sb->s_fs_info;
1939 struct nfs_parsed_mount_data *data;
1940 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1941 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1942 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1943
1944 /*
1945 * Userspace mount programs that send binary options generally send
1946 * them populated with default values. We have no way to know which
1947 * ones were explicitly specified. Fall back to legacy behavior and
1948 * just return success.
1949 */
1950 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1951 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1952 options->version <= 6))))
1953 return 0;
1954
1955 data = kzalloc(sizeof(*data), GFP_KERNEL);
1956 if (data == NULL)
1957 return -ENOMEM;
1958
1959 /* fill out struct with values from existing mount */
1960 data->flags = nfss->flags;
1961 data->rsize = nfss->rsize;
1962 data->wsize = nfss->wsize;
1963 data->retrans = nfss->client->cl_timeout->to_retries;
1964 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1965 data->acregmin = nfss->acregmin / HZ;
1966 data->acregmax = nfss->acregmax / HZ;
1967 data->acdirmin = nfss->acdirmin / HZ;
1968 data->acdirmax = nfss->acdirmax / HZ;
1969 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1970 data->nfs_server.port = nfss->port;
1971 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1972 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1973 data->nfs_server.addrlen);
1974
1975 /* overwrite those values with any that were specified */
1976 error = nfs_parse_mount_options((char *)options, data);
1977 if (error < 0)
1978 goto out;
1979
1980 /*
1981 * noac is a special case. It implies -o sync, but that's not
1982 * necessarily reflected in the mtab options. do_remount_sb
1983 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
1984 * remount options, so we have to explicitly reset it.
1985 */
1986 if (data->flags & NFS_MOUNT_NOAC)
1987 *flags |= MS_SYNCHRONOUS;
1988
1989 /* compare new mount options with old ones */
1990 error = nfs_compare_remount_data(nfss, data);
1991 out:
1992 kfree(data);
1993 return error;
1994 }
1995
1996 /*
1997 * Initialise the common bits of the superblock
1998 */
1999 static inline void nfs_initialise_sb(struct super_block *sb)
2000 {
2001 struct nfs_server *server = NFS_SB(sb);
2002
2003 sb->s_magic = NFS_SUPER_MAGIC;
2004
2005 /* We probably want something more informative here */
2006 snprintf(sb->s_id, sizeof(sb->s_id),
2007 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2008
2009 if (sb->s_blocksize == 0)
2010 sb->s_blocksize = nfs_block_bits(server->wsize,
2011 &sb->s_blocksize_bits);
2012
2013 if (server->flags & NFS_MOUNT_NOAC)
2014 sb->s_flags |= MS_SYNCHRONOUS;
2015
2016 sb->s_bdi = &server->backing_dev_info;
2017
2018 nfs_super_set_maxbytes(sb, server->maxfilesize);
2019 }
2020
2021 /*
2022 * Finish setting up an NFS2/3 superblock
2023 */
2024 static void nfs_fill_super(struct super_block *sb,
2025 struct nfs_parsed_mount_data *data)
2026 {
2027 struct nfs_server *server = NFS_SB(sb);
2028
2029 sb->s_blocksize_bits = 0;
2030 sb->s_blocksize = 0;
2031 if (data->bsize)
2032 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2033
2034 if (server->nfs_client->rpc_ops->version == 3) {
2035 /* The VFS shouldn't apply the umask to mode bits. We will do
2036 * so ourselves when necessary.
2037 */
2038 sb->s_flags |= MS_POSIXACL;
2039 sb->s_time_gran = 1;
2040 }
2041
2042 sb->s_op = &nfs_sops;
2043 nfs_initialise_sb(sb);
2044 }
2045
2046 /*
2047 * Finish setting up a cloned NFS2/3 superblock
2048 */
2049 static void nfs_clone_super(struct super_block *sb,
2050 const struct super_block *old_sb)
2051 {
2052 struct nfs_server *server = NFS_SB(sb);
2053
2054 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2055 sb->s_blocksize = old_sb->s_blocksize;
2056 sb->s_maxbytes = old_sb->s_maxbytes;
2057
2058 if (server->nfs_client->rpc_ops->version == 3) {
2059 /* The VFS shouldn't apply the umask to mode bits. We will do
2060 * so ourselves when necessary.
2061 */
2062 sb->s_flags |= MS_POSIXACL;
2063 sb->s_time_gran = 1;
2064 }
2065
2066 sb->s_op = old_sb->s_op;
2067 nfs_initialise_sb(sb);
2068 }
2069
2070 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2071 {
2072 const struct nfs_server *a = s->s_fs_info;
2073 const struct rpc_clnt *clnt_a = a->client;
2074 const struct rpc_clnt *clnt_b = b->client;
2075
2076 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2077 goto Ebusy;
2078 if (a->nfs_client != b->nfs_client)
2079 goto Ebusy;
2080 if (a->flags != b->flags)
2081 goto Ebusy;
2082 if (a->wsize != b->wsize)
2083 goto Ebusy;
2084 if (a->rsize != b->rsize)
2085 goto Ebusy;
2086 if (a->acregmin != b->acregmin)
2087 goto Ebusy;
2088 if (a->acregmax != b->acregmax)
2089 goto Ebusy;
2090 if (a->acdirmin != b->acdirmin)
2091 goto Ebusy;
2092 if (a->acdirmax != b->acdirmax)
2093 goto Ebusy;
2094 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2095 goto Ebusy;
2096 return 1;
2097 Ebusy:
2098 return 0;
2099 }
2100
2101 struct nfs_sb_mountdata {
2102 struct nfs_server *server;
2103 int mntflags;
2104 };
2105
2106 static int nfs_set_super(struct super_block *s, void *data)
2107 {
2108 struct nfs_sb_mountdata *sb_mntdata = data;
2109 struct nfs_server *server = sb_mntdata->server;
2110 int ret;
2111
2112 s->s_flags = sb_mntdata->mntflags;
2113 s->s_fs_info = server;
2114 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2115 ret = set_anon_super(s, server);
2116 if (ret == 0)
2117 server->s_dev = s->s_dev;
2118 return ret;
2119 }
2120
2121 static int nfs_compare_super_address(struct nfs_server *server1,
2122 struct nfs_server *server2)
2123 {
2124 struct sockaddr *sap1, *sap2;
2125
2126 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2127 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2128
2129 if (sap1->sa_family != sap2->sa_family)
2130 return 0;
2131
2132 switch (sap1->sa_family) {
2133 case AF_INET: {
2134 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2135 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2136 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2137 return 0;
2138 if (sin1->sin_port != sin2->sin_port)
2139 return 0;
2140 break;
2141 }
2142 case AF_INET6: {
2143 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2144 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2145 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2146 return 0;
2147 if (sin1->sin6_port != sin2->sin6_port)
2148 return 0;
2149 break;
2150 }
2151 default:
2152 return 0;
2153 }
2154
2155 return 1;
2156 }
2157
2158 static int nfs_compare_super(struct super_block *sb, void *data)
2159 {
2160 struct nfs_sb_mountdata *sb_mntdata = data;
2161 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2162 int mntflags = sb_mntdata->mntflags;
2163
2164 if (!nfs_compare_super_address(old, server))
2165 return 0;
2166 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2167 if (old->flags & NFS_MOUNT_UNSHARED)
2168 return 0;
2169 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2170 return 0;
2171 return nfs_compare_mount_options(sb, server, mntflags);
2172 }
2173
2174 static int nfs_bdi_register(struct nfs_server *server)
2175 {
2176 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2177 }
2178
2179 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2180 int flags, const char *dev_name, void *raw_data)
2181 {
2182 struct nfs_server *server = NULL;
2183 struct super_block *s;
2184 struct nfs_parsed_mount_data *data;
2185 struct nfs_fh *mntfh;
2186 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2187 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2188 struct nfs_sb_mountdata sb_mntdata = {
2189 .mntflags = flags,
2190 };
2191 int error;
2192
2193 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2194 mntfh = nfs_alloc_fhandle();
2195 if (data == NULL || mntfh == NULL)
2196 goto out_free_fh;
2197
2198 security_init_mnt_opts(&data->lsm_opts);
2199
2200 /* Validate the mount data */
2201 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2202 if (error < 0) {
2203 mntroot = ERR_PTR(error);
2204 goto out;
2205 }
2206
2207 #ifdef CONFIG_NFS_V4
2208 if (data->version == 4) {
2209 mntroot = nfs4_try_mount(flags, dev_name, data);
2210 kfree(data->client_address);
2211 kfree(data->nfs_server.export_path);
2212 goto out;
2213 }
2214 #endif /* CONFIG_NFS_V4 */
2215
2216 /* Get a volume representation */
2217 server = nfs_create_server(data, mntfh);
2218 if (IS_ERR(server)) {
2219 mntroot = ERR_CAST(server);
2220 goto out;
2221 }
2222 sb_mntdata.server = server;
2223
2224 if (server->flags & NFS_MOUNT_UNSHARED)
2225 compare_super = NULL;
2226
2227 /* Get a superblock - note that we may end up sharing one that already exists */
2228 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2229 if (IS_ERR(s)) {
2230 mntroot = ERR_CAST(s);
2231 goto out_err_nosb;
2232 }
2233
2234 if (s->s_fs_info != server) {
2235 nfs_free_server(server);
2236 server = NULL;
2237 } else {
2238 error = nfs_bdi_register(server);
2239 if (error) {
2240 mntroot = ERR_PTR(error);
2241 goto error_splat_bdi;
2242 }
2243 }
2244
2245 if (!s->s_root) {
2246 /* initial superblock/root creation */
2247 nfs_fill_super(s, data);
2248 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2249 }
2250
2251 mntroot = nfs_get_root(s, mntfh, dev_name);
2252 if (IS_ERR(mntroot))
2253 goto error_splat_super;
2254
2255 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2256 if (error)
2257 goto error_splat_root;
2258
2259 s->s_flags |= MS_ACTIVE;
2260
2261 out:
2262 kfree(data->nfs_server.hostname);
2263 kfree(data->mount_server.hostname);
2264 kfree(data->fscache_uniq);
2265 security_free_mnt_opts(&data->lsm_opts);
2266 out_free_fh:
2267 nfs_free_fhandle(mntfh);
2268 kfree(data);
2269 return mntroot;
2270
2271 out_err_nosb:
2272 nfs_free_server(server);
2273 goto out;
2274
2275 error_splat_root:
2276 dput(mntroot);
2277 mntroot = ERR_PTR(error);
2278 error_splat_super:
2279 if (server && !s->s_root)
2280 bdi_unregister(&server->backing_dev_info);
2281 error_splat_bdi:
2282 deactivate_locked_super(s);
2283 goto out;
2284 }
2285
2286 /*
2287 * Ensure that we unregister the bdi before kill_anon_super
2288 * releases the device name
2289 */
2290 static void nfs_put_super(struct super_block *s)
2291 {
2292 struct nfs_server *server = NFS_SB(s);
2293
2294 bdi_unregister(&server->backing_dev_info);
2295 }
2296
2297 /*
2298 * Destroy an NFS2/3 superblock
2299 */
2300 static void nfs_kill_super(struct super_block *s)
2301 {
2302 struct nfs_server *server = NFS_SB(s);
2303
2304 kill_anon_super(s);
2305 nfs_fscache_release_super_cookie(s);
2306 nfs_free_server(server);
2307 }
2308
2309 /*
2310 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2311 */
2312 static struct dentry *
2313 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2314 const char *dev_name, void *raw_data)
2315 {
2316 struct nfs_clone_mount *data = raw_data;
2317 struct super_block *s;
2318 struct nfs_server *server;
2319 struct dentry *mntroot;
2320 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2321 struct nfs_sb_mountdata sb_mntdata = {
2322 .mntflags = flags,
2323 };
2324 int error;
2325
2326 dprintk("--> nfs_xdev_mount()\n");
2327
2328 /* create a new volume representation */
2329 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2330 if (IS_ERR(server)) {
2331 error = PTR_ERR(server);
2332 goto out_err_noserver;
2333 }
2334 sb_mntdata.server = server;
2335
2336 if (server->flags & NFS_MOUNT_UNSHARED)
2337 compare_super = NULL;
2338
2339 /* Get a superblock - note that we may end up sharing one that already exists */
2340 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2341 if (IS_ERR(s)) {
2342 error = PTR_ERR(s);
2343 goto out_err_nosb;
2344 }
2345
2346 if (s->s_fs_info != server) {
2347 nfs_free_server(server);
2348 server = NULL;
2349 } else {
2350 error = nfs_bdi_register(server);
2351 if (error)
2352 goto error_splat_bdi;
2353 }
2354
2355 if (!s->s_root) {
2356 /* initial superblock/root creation */
2357 nfs_clone_super(s, data->sb);
2358 nfs_fscache_get_super_cookie(s, NULL, data);
2359 }
2360
2361 mntroot = nfs_get_root(s, data->fh, dev_name);
2362 if (IS_ERR(mntroot)) {
2363 error = PTR_ERR(mntroot);
2364 goto error_splat_super;
2365 }
2366 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2367 dput(mntroot);
2368 error = -ESTALE;
2369 goto error_splat_super;
2370 }
2371
2372 s->s_flags |= MS_ACTIVE;
2373
2374 /* clone any lsm security options from the parent to the new sb */
2375 security_sb_clone_mnt_opts(data->sb, s);
2376
2377 dprintk("<-- nfs_xdev_mount() = 0\n");
2378 return mntroot;
2379
2380 out_err_nosb:
2381 nfs_free_server(server);
2382 out_err_noserver:
2383 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2384 return ERR_PTR(error);
2385
2386 error_splat_super:
2387 if (server && !s->s_root)
2388 bdi_unregister(&server->backing_dev_info);
2389 error_splat_bdi:
2390 deactivate_locked_super(s);
2391 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2392 return ERR_PTR(error);
2393 }
2394
2395 #ifdef CONFIG_NFS_V4
2396
2397 /*
2398 * Finish setting up a cloned NFS4 superblock
2399 */
2400 static void nfs4_clone_super(struct super_block *sb,
2401 const struct super_block *old_sb)
2402 {
2403 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2404 sb->s_blocksize = old_sb->s_blocksize;
2405 sb->s_maxbytes = old_sb->s_maxbytes;
2406 sb->s_time_gran = 1;
2407 sb->s_op = old_sb->s_op;
2408 /*
2409 * The VFS shouldn't apply the umask to mode bits. We will do
2410 * so ourselves when necessary.
2411 */
2412 sb->s_flags |= MS_POSIXACL;
2413 sb->s_xattr = old_sb->s_xattr;
2414 nfs_initialise_sb(sb);
2415 }
2416
2417 /*
2418 * Set up an NFS4 superblock
2419 */
2420 static void nfs4_fill_super(struct super_block *sb)
2421 {
2422 sb->s_time_gran = 1;
2423 sb->s_op = &nfs4_sops;
2424 /*
2425 * The VFS shouldn't apply the umask to mode bits. We will do
2426 * so ourselves when necessary.
2427 */
2428 sb->s_flags |= MS_POSIXACL;
2429 sb->s_xattr = nfs4_xattr_handlers;
2430 nfs_initialise_sb(sb);
2431 }
2432
2433 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2434 {
2435 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2436 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2437 }
2438
2439 static int nfs4_validate_text_mount_data(void *options,
2440 struct nfs_parsed_mount_data *args,
2441 const char *dev_name)
2442 {
2443 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2444
2445 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2446
2447 nfs_validate_transport_protocol(args);
2448
2449 nfs4_validate_mount_flags(args);
2450
2451 if (args->version != 4) {
2452 dfprintk(MOUNT,
2453 "NFS4: Illegal mount version\n");
2454 return -EINVAL;
2455 }
2456
2457 if (args->auth_flavor_len > 1) {
2458 dfprintk(MOUNT,
2459 "NFS4: Too many RPC auth flavours specified\n");
2460 return -EINVAL;
2461 }
2462
2463 if (args->client_address == NULL) {
2464 dfprintk(MOUNT,
2465 "NFS4: mount program didn't pass callback address\n");
2466 return -EINVAL;
2467 }
2468
2469 return nfs_parse_devname(dev_name,
2470 &args->nfs_server.hostname,
2471 NFS4_MAXNAMLEN,
2472 &args->nfs_server.export_path,
2473 NFS4_MAXPATHLEN);
2474 }
2475
2476 /*
2477 * Validate NFSv4 mount options
2478 */
2479 static int nfs4_validate_mount_data(void *options,
2480 struct nfs_parsed_mount_data *args,
2481 const char *dev_name)
2482 {
2483 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2484 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2485 char *c;
2486
2487 if (data == NULL)
2488 goto out_no_data;
2489
2490 switch (data->version) {
2491 case 1:
2492 if (data->host_addrlen > sizeof(args->nfs_server.address))
2493 goto out_no_address;
2494 if (data->host_addrlen == 0)
2495 goto out_no_address;
2496 args->nfs_server.addrlen = data->host_addrlen;
2497 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2498 return -EFAULT;
2499 if (!nfs_verify_server_address(sap))
2500 goto out_no_address;
2501
2502 if (data->auth_flavourlen) {
2503 if (data->auth_flavourlen > 1)
2504 goto out_inval_auth;
2505 if (copy_from_user(&args->auth_flavors[0],
2506 data->auth_flavours,
2507 sizeof(args->auth_flavors[0])))
2508 return -EFAULT;
2509 }
2510
2511 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2512 if (IS_ERR(c))
2513 return PTR_ERR(c);
2514 args->nfs_server.hostname = c;
2515
2516 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2517 if (IS_ERR(c))
2518 return PTR_ERR(c);
2519 args->nfs_server.export_path = c;
2520 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2521
2522 c = strndup_user(data->client_addr.data, 16);
2523 if (IS_ERR(c))
2524 return PTR_ERR(c);
2525 args->client_address = c;
2526
2527 /*
2528 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2529 * can deal with.
2530 */
2531
2532 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2533 args->rsize = data->rsize;
2534 args->wsize = data->wsize;
2535 args->timeo = data->timeo;
2536 args->retrans = data->retrans;
2537 args->acregmin = data->acregmin;
2538 args->acregmax = data->acregmax;
2539 args->acdirmin = data->acdirmin;
2540 args->acdirmax = data->acdirmax;
2541 args->nfs_server.protocol = data->proto;
2542 nfs_validate_transport_protocol(args);
2543
2544 break;
2545 default:
2546 if (nfs_parse_mount_options((char *)options, args) == 0)
2547 return -EINVAL;
2548
2549 if (!nfs_verify_server_address(sap))
2550 return -EINVAL;
2551
2552 return nfs4_validate_text_mount_data(options, args, dev_name);
2553 }
2554
2555 return 0;
2556
2557 out_no_data:
2558 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2559 return -EINVAL;
2560
2561 out_inval_auth:
2562 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2563 data->auth_flavourlen);
2564 return -EINVAL;
2565
2566 out_no_address:
2567 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2568 return -EINVAL;
2569 }
2570
2571 /*
2572 * Get the superblock for the NFS4 root partition
2573 */
2574 static struct dentry *
2575 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2576 const char *dev_name, void *raw_data)
2577 {
2578 struct nfs_parsed_mount_data *data = raw_data;
2579 struct super_block *s;
2580 struct nfs_server *server;
2581 struct nfs_fh *mntfh;
2582 struct dentry *mntroot;
2583 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2584 struct nfs_sb_mountdata sb_mntdata = {
2585 .mntflags = flags,
2586 };
2587 int error = -ENOMEM;
2588
2589 mntfh = nfs_alloc_fhandle();
2590 if (data == NULL || mntfh == NULL)
2591 goto out_free_fh;
2592
2593 security_init_mnt_opts(&data->lsm_opts);
2594
2595 /* Get a volume representation */
2596 server = nfs4_create_server(data, mntfh);
2597 if (IS_ERR(server)) {
2598 error = PTR_ERR(server);
2599 goto out;
2600 }
2601 sb_mntdata.server = server;
2602
2603 if (server->flags & NFS4_MOUNT_UNSHARED)
2604 compare_super = NULL;
2605
2606 /* Get a superblock - note that we may end up sharing one that already exists */
2607 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2608 if (IS_ERR(s)) {
2609 error = PTR_ERR(s);
2610 goto out_free;
2611 }
2612
2613 if (s->s_fs_info != server) {
2614 nfs_free_server(server);
2615 server = NULL;
2616 } else {
2617 error = nfs_bdi_register(server);
2618 if (error)
2619 goto error_splat_bdi;
2620 }
2621
2622 if (!s->s_root) {
2623 /* initial superblock/root creation */
2624 nfs4_fill_super(s);
2625 nfs_fscache_get_super_cookie(
2626 s, data ? data->fscache_uniq : NULL, NULL);
2627 }
2628
2629 mntroot = nfs4_get_root(s, mntfh, dev_name);
2630 if (IS_ERR(mntroot)) {
2631 error = PTR_ERR(mntroot);
2632 goto error_splat_super;
2633 }
2634
2635 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2636 if (error)
2637 goto error_splat_root;
2638
2639 s->s_flags |= MS_ACTIVE;
2640
2641 security_free_mnt_opts(&data->lsm_opts);
2642 nfs_free_fhandle(mntfh);
2643 return mntroot;
2644
2645 out:
2646 security_free_mnt_opts(&data->lsm_opts);
2647 out_free_fh:
2648 nfs_free_fhandle(mntfh);
2649 return ERR_PTR(error);
2650
2651 out_free:
2652 nfs_free_server(server);
2653 goto out;
2654
2655 error_splat_root:
2656 dput(mntroot);
2657 error_splat_super:
2658 if (server && !s->s_root)
2659 bdi_unregister(&server->backing_dev_info);
2660 error_splat_bdi:
2661 deactivate_locked_super(s);
2662 goto out;
2663 }
2664
2665 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2666 int flags, void *data, const char *hostname)
2667 {
2668 struct vfsmount *root_mnt;
2669 char *root_devname;
2670 size_t len;
2671
2672 len = strlen(hostname) + 3;
2673 root_devname = kmalloc(len, GFP_KERNEL);
2674 if (root_devname == NULL)
2675 return ERR_PTR(-ENOMEM);
2676 snprintf(root_devname, len, "%s:/", hostname);
2677 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2678 kfree(root_devname);
2679 return root_mnt;
2680 }
2681
2682 struct nfs_referral_count {
2683 struct list_head list;
2684 const struct task_struct *task;
2685 unsigned int referral_count;
2686 };
2687
2688 static LIST_HEAD(nfs_referral_count_list);
2689 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2690
2691 static struct nfs_referral_count *nfs_find_referral_count(void)
2692 {
2693 struct nfs_referral_count *p;
2694
2695 list_for_each_entry(p, &nfs_referral_count_list, list) {
2696 if (p->task == current)
2697 return p;
2698 }
2699 return NULL;
2700 }
2701
2702 #define NFS_MAX_NESTED_REFERRALS 2
2703
2704 static int nfs_referral_loop_protect(void)
2705 {
2706 struct nfs_referral_count *p, *new;
2707 int ret = -ENOMEM;
2708
2709 new = kmalloc(sizeof(*new), GFP_KERNEL);
2710 if (!new)
2711 goto out;
2712 new->task = current;
2713 new->referral_count = 1;
2714
2715 ret = 0;
2716 spin_lock(&nfs_referral_count_list_lock);
2717 p = nfs_find_referral_count();
2718 if (p != NULL) {
2719 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2720 ret = -ELOOP;
2721 else
2722 p->referral_count++;
2723 } else {
2724 list_add(&new->list, &nfs_referral_count_list);
2725 new = NULL;
2726 }
2727 spin_unlock(&nfs_referral_count_list_lock);
2728 kfree(new);
2729 out:
2730 return ret;
2731 }
2732
2733 static void nfs_referral_loop_unprotect(void)
2734 {
2735 struct nfs_referral_count *p;
2736
2737 spin_lock(&nfs_referral_count_list_lock);
2738 p = nfs_find_referral_count();
2739 p->referral_count--;
2740 if (p->referral_count == 0)
2741 list_del(&p->list);
2742 else
2743 p = NULL;
2744 spin_unlock(&nfs_referral_count_list_lock);
2745 kfree(p);
2746 }
2747
2748 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2749 const char *export_path)
2750 {
2751 struct nameidata *nd = NULL;
2752 struct mnt_namespace *ns_private;
2753 struct super_block *s;
2754 struct dentry *dentry;
2755 int ret;
2756
2757 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2758 if (nd == NULL)
2759 return ERR_PTR(-ENOMEM);
2760
2761 ns_private = create_mnt_ns(root_mnt);
2762 ret = PTR_ERR(ns_private);
2763 if (IS_ERR(ns_private))
2764 goto out_mntput;
2765
2766 ret = nfs_referral_loop_protect();
2767 if (ret != 0)
2768 goto out_put_mnt_ns;
2769
2770 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2771 export_path, LOOKUP_FOLLOW, nd);
2772
2773 nfs_referral_loop_unprotect();
2774 put_mnt_ns(ns_private);
2775
2776 if (ret != 0)
2777 goto out_err;
2778
2779 s = nd->path.mnt->mnt_sb;
2780 atomic_inc(&s->s_active);
2781 dentry = dget(nd->path.dentry);
2782
2783 path_put(&nd->path);
2784 kfree(nd);
2785 down_write(&s->s_umount);
2786 return dentry;
2787 out_put_mnt_ns:
2788 put_mnt_ns(ns_private);
2789 out_mntput:
2790 mntput(root_mnt);
2791 out_err:
2792 kfree(nd);
2793 return ERR_PTR(ret);
2794 }
2795
2796 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2797 struct nfs_parsed_mount_data *data)
2798 {
2799 char *export_path;
2800 struct vfsmount *root_mnt;
2801 struct dentry *res;
2802
2803 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2804
2805 export_path = data->nfs_server.export_path;
2806 data->nfs_server.export_path = "/";
2807 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2808 data->nfs_server.hostname);
2809 data->nfs_server.export_path = export_path;
2810
2811 res = ERR_CAST(root_mnt);
2812 if (!IS_ERR(root_mnt))
2813 res = nfs_follow_remote_path(root_mnt, export_path);
2814
2815 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2816 IS_ERR(res) ? PTR_ERR(res) : 0,
2817 IS_ERR(res) ? " [error]" : "");
2818 return res;
2819 }
2820
2821 /*
2822 * Get the superblock for an NFS4 mountpoint
2823 */
2824 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2825 int flags, const char *dev_name, void *raw_data)
2826 {
2827 struct nfs_parsed_mount_data *data;
2828 int error = -ENOMEM;
2829 struct dentry *res = ERR_PTR(-ENOMEM);
2830
2831 data = nfs_alloc_parsed_mount_data(4);
2832 if (data == NULL)
2833 goto out_free_data;
2834
2835 /* Validate the mount data */
2836 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2837 if (error < 0) {
2838 res = ERR_PTR(error);
2839 goto out;
2840 }
2841
2842 res = nfs4_try_mount(flags, dev_name, data);
2843 if (IS_ERR(res))
2844 error = PTR_ERR(res);
2845
2846 out:
2847 kfree(data->client_address);
2848 kfree(data->nfs_server.export_path);
2849 kfree(data->nfs_server.hostname);
2850 kfree(data->fscache_uniq);
2851 out_free_data:
2852 kfree(data);
2853 dprintk("<-- nfs4_mount() = %d%s\n", error,
2854 error != 0 ? " [error]" : "");
2855 return res;
2856 }
2857
2858 static void nfs4_kill_super(struct super_block *sb)
2859 {
2860 struct nfs_server *server = NFS_SB(sb);
2861
2862 dprintk("--> %s\n", __func__);
2863 nfs_super_return_all_delegations(sb);
2864 kill_anon_super(sb);
2865 nfs_fscache_release_super_cookie(sb);
2866 nfs_free_server(server);
2867 dprintk("<-- %s\n", __func__);
2868 }
2869
2870 /*
2871 * Clone an NFS4 server record on xdev traversal (FSID-change)
2872 */
2873 static struct dentry *
2874 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2875 const char *dev_name, void *raw_data)
2876 {
2877 struct nfs_clone_mount *data = raw_data;
2878 struct super_block *s;
2879 struct nfs_server *server;
2880 struct dentry *mntroot;
2881 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2882 struct nfs_sb_mountdata sb_mntdata = {
2883 .mntflags = flags,
2884 };
2885 int error;
2886
2887 dprintk("--> nfs4_xdev_mount()\n");
2888
2889 /* create a new volume representation */
2890 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2891 if (IS_ERR(server)) {
2892 error = PTR_ERR(server);
2893 goto out_err_noserver;
2894 }
2895 sb_mntdata.server = server;
2896
2897 if (server->flags & NFS4_MOUNT_UNSHARED)
2898 compare_super = NULL;
2899
2900 /* Get a superblock - note that we may end up sharing one that already exists */
2901 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2902 if (IS_ERR(s)) {
2903 error = PTR_ERR(s);
2904 goto out_err_nosb;
2905 }
2906
2907 if (s->s_fs_info != server) {
2908 nfs_free_server(server);
2909 server = NULL;
2910 } else {
2911 error = nfs_bdi_register(server);
2912 if (error)
2913 goto error_splat_bdi;
2914 }
2915
2916 if (!s->s_root) {
2917 /* initial superblock/root creation */
2918 nfs4_clone_super(s, data->sb);
2919 nfs_fscache_get_super_cookie(s, NULL, data);
2920 }
2921
2922 mntroot = nfs4_get_root(s, data->fh, dev_name);
2923 if (IS_ERR(mntroot)) {
2924 error = PTR_ERR(mntroot);
2925 goto error_splat_super;
2926 }
2927 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2928 dput(mntroot);
2929 error = -ESTALE;
2930 goto error_splat_super;
2931 }
2932
2933 s->s_flags |= MS_ACTIVE;
2934
2935 security_sb_clone_mnt_opts(data->sb, s);
2936
2937 dprintk("<-- nfs4_xdev_mount() = 0\n");
2938 return mntroot;
2939
2940 out_err_nosb:
2941 nfs_free_server(server);
2942 out_err_noserver:
2943 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2944 return ERR_PTR(error);
2945
2946 error_splat_super:
2947 if (server && !s->s_root)
2948 bdi_unregister(&server->backing_dev_info);
2949 error_splat_bdi:
2950 deactivate_locked_super(s);
2951 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2952 return ERR_PTR(error);
2953 }
2954
2955 static struct dentry *
2956 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2957 const char *dev_name, void *raw_data)
2958 {
2959 struct nfs_clone_mount *data = raw_data;
2960 struct super_block *s;
2961 struct nfs_server *server;
2962 struct dentry *mntroot;
2963 struct nfs_fh *mntfh;
2964 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2965 struct nfs_sb_mountdata sb_mntdata = {
2966 .mntflags = flags,
2967 };
2968 int error = -ENOMEM;
2969
2970 dprintk("--> nfs4_referral_get_sb()\n");
2971
2972 mntfh = nfs_alloc_fhandle();
2973 if (mntfh == NULL)
2974 goto out_err_nofh;
2975
2976 /* create a new volume representation */
2977 server = nfs4_create_referral_server(data, mntfh);
2978 if (IS_ERR(server)) {
2979 error = PTR_ERR(server);
2980 goto out_err_noserver;
2981 }
2982 sb_mntdata.server = server;
2983
2984 if (server->flags & NFS4_MOUNT_UNSHARED)
2985 compare_super = NULL;
2986
2987 /* Get a superblock - note that we may end up sharing one that already exists */
2988 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2989 if (IS_ERR(s)) {
2990 error = PTR_ERR(s);
2991 goto out_err_nosb;
2992 }
2993
2994 if (s->s_fs_info != server) {
2995 nfs_free_server(server);
2996 server = NULL;
2997 } else {
2998 error = nfs_bdi_register(server);
2999 if (error)
3000 goto error_splat_bdi;
3001 }
3002
3003 if (!s->s_root) {
3004 /* initial superblock/root creation */
3005 nfs4_fill_super(s);
3006 nfs_fscache_get_super_cookie(s, NULL, data);
3007 }
3008
3009 mntroot = nfs4_get_root(s, mntfh, dev_name);
3010 if (IS_ERR(mntroot)) {
3011 error = PTR_ERR(mntroot);
3012 goto error_splat_super;
3013 }
3014 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3015 dput(mntroot);
3016 error = -ESTALE;
3017 goto error_splat_super;
3018 }
3019
3020 s->s_flags |= MS_ACTIVE;
3021
3022 security_sb_clone_mnt_opts(data->sb, s);
3023
3024 nfs_free_fhandle(mntfh);
3025 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3026 return mntroot;
3027
3028 out_err_nosb:
3029 nfs_free_server(server);
3030 out_err_noserver:
3031 nfs_free_fhandle(mntfh);
3032 out_err_nofh:
3033 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3034 return ERR_PTR(error);
3035
3036 error_splat_super:
3037 if (server && !s->s_root)
3038 bdi_unregister(&server->backing_dev_info);
3039 error_splat_bdi:
3040 deactivate_locked_super(s);
3041 nfs_free_fhandle(mntfh);
3042 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3043 return ERR_PTR(error);
3044 }
3045
3046 /*
3047 * Create an NFS4 server record on referral traversal
3048 */
3049 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3050 int flags, const char *dev_name, void *raw_data)
3051 {
3052 struct nfs_clone_mount *data = raw_data;
3053 char *export_path;
3054 struct vfsmount *root_mnt;
3055 struct dentry *res;
3056
3057 dprintk("--> nfs4_referral_mount()\n");
3058
3059 export_path = data->mnt_path;
3060 data->mnt_path = "/";
3061
3062 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3063 flags, data, data->hostname);
3064 data->mnt_path = export_path;
3065
3066 res = ERR_CAST(root_mnt);
3067 if (!IS_ERR(root_mnt))
3068 res = nfs_follow_remote_path(root_mnt, export_path);
3069 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3070 IS_ERR(res) ? PTR_ERR(res) : 0,
3071 IS_ERR(res) ? " [error]" : "");
3072 return res;
3073 }
3074
3075 #endif /* CONFIG_NFS_V4 */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree