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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / fs / nfs / super.c
blob90be551b80c19fa2733349cbecfdfe231f2a5573
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/mnt_namespace.h>
46 #include <linux/namei.h>
47 #include <linux/nfs_idmap.h>
48 #include <linux/vfs.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66
67 #define NFSDBG_FACILITY NFSDBG_VFS
68
69 enum {
70 /* Mount options that take no arguments */
71 Opt_soft, Opt_hard,
72 Opt_posix, Opt_noposix,
73 Opt_cto, Opt_nocto,
74 Opt_ac, Opt_noac,
75 Opt_lock, Opt_nolock,
76 Opt_v2, Opt_v3, Opt_v4,
77 Opt_udp, Opt_tcp, Opt_rdma,
78 Opt_acl, Opt_noacl,
79 Opt_rdirplus, Opt_nordirplus,
80 Opt_sharecache, Opt_nosharecache,
81 Opt_resvport, Opt_noresvport,
82 Opt_fscache, Opt_nofscache,
83
84 /* Mount options that take integer arguments */
85 Opt_port,
86 Opt_rsize, Opt_wsize, Opt_bsize,
87 Opt_timeo, Opt_retrans,
88 Opt_acregmin, Opt_acregmax,
89 Opt_acdirmin, Opt_acdirmax,
90 Opt_actimeo,
91 Opt_namelen,
92 Opt_mountport,
93 Opt_mountvers,
94 Opt_nfsvers,
95 Opt_minorversion,
96
97 /* Mount options that take string arguments */
98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
100 Opt_lookupcache,
101 Opt_fscache_uniq,
102
103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
105
106 Opt_err
107 };
108
109 static const match_table_t nfs_mount_option_tokens = {
110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
112 { Opt_userspace, "retry=%s" },
113
114 { Opt_sloppy, "sloppy" },
115
116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
120 { Opt_posix, "posix" },
121 { Opt_noposix, "noposix" },
122 { Opt_cto, "cto" },
123 { Opt_nocto, "nocto" },
124 { Opt_ac, "ac" },
125 { Opt_noac, "noac" },
126 { Opt_lock, "lock" },
127 { Opt_nolock, "nolock" },
128 { Opt_v2, "v2" },
129 { Opt_v3, "v3" },
130 { Opt_v4, "v4" },
131 { Opt_udp, "udp" },
132 { Opt_tcp, "tcp" },
133 { Opt_rdma, "rdma" },
134 { Opt_acl, "acl" },
135 { Opt_noacl, "noacl" },
136 { Opt_rdirplus, "rdirplus" },
137 { Opt_nordirplus, "nordirplus" },
138 { Opt_sharecache, "sharecache" },
139 { Opt_nosharecache, "nosharecache" },
140 { Opt_resvport, "resvport" },
141 { Opt_noresvport, "noresvport" },
142 { Opt_fscache, "fsc" },
143 { Opt_fscache_uniq, "fsc=%s" },
144 { Opt_nofscache, "nofsc" },
145
146 { Opt_port, "port=%s" },
147 { Opt_rsize, "rsize=%s" },
148 { Opt_wsize, "wsize=%s" },
149 { Opt_bsize, "bsize=%s" },
150 { Opt_timeo, "timeo=%s" },
151 { Opt_retrans, "retrans=%s" },
152 { Opt_acregmin, "acregmin=%s" },
153 { Opt_acregmax, "acregmax=%s" },
154 { Opt_acdirmin, "acdirmin=%s" },
155 { Opt_acdirmax, "acdirmax=%s" },
156 { Opt_actimeo, "actimeo=%s" },
157 { Opt_namelen, "namlen=%s" },
158 { Opt_mountport, "mountport=%s" },
159 { Opt_mountvers, "mountvers=%s" },
160 { Opt_nfsvers, "nfsvers=%s" },
161 { Opt_nfsvers, "vers=%s" },
162 { Opt_minorversion, "minorversion=%s" },
163
164 { Opt_sec, "sec=%s" },
165 { Opt_proto, "proto=%s" },
166 { Opt_mountproto, "mountproto=%s" },
167 { Opt_addr, "addr=%s" },
168 { Opt_clientaddr, "clientaddr=%s" },
169 { Opt_mounthost, "mounthost=%s" },
170 { Opt_mountaddr, "mountaddr=%s" },
171
172 { Opt_lookupcache, "lookupcache=%s" },
173
174 { Opt_err, NULL }
175 };
176
177 enum {
178 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
179
180 Opt_xprt_err
181 };
182
183 static const match_table_t nfs_xprt_protocol_tokens = {
184 { Opt_xprt_udp, "udp" },
185 { Opt_xprt_tcp, "tcp" },
186 { Opt_xprt_rdma, "rdma" },
187
188 { Opt_xprt_err, NULL }
189 };
190
191 enum {
192 Opt_sec_none, Opt_sec_sys,
193 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
194 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
195 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
196
197 Opt_sec_err
198 };
199
200 static const match_table_t nfs_secflavor_tokens = {
201 { Opt_sec_none, "none" },
202 { Opt_sec_none, "null" },
203 { Opt_sec_sys, "sys" },
204
205 { Opt_sec_krb5, "krb5" },
206 { Opt_sec_krb5i, "krb5i" },
207 { Opt_sec_krb5p, "krb5p" },
208
209 { Opt_sec_lkey, "lkey" },
210 { Opt_sec_lkeyi, "lkeyi" },
211 { Opt_sec_lkeyp, "lkeyp" },
212
213 { Opt_sec_spkm, "spkm3" },
214 { Opt_sec_spkmi, "spkm3i" },
215 { Opt_sec_spkmp, "spkm3p" },
216
217 { Opt_sec_err, NULL }
218 };
219
220 enum {
221 Opt_lookupcache_all, Opt_lookupcache_positive,
222 Opt_lookupcache_none,
223
224 Opt_lookupcache_err
225 };
226
227 static match_table_t nfs_lookupcache_tokens = {
228 { Opt_lookupcache_all, "all" },
229 { Opt_lookupcache_positive, "pos" },
230 { Opt_lookupcache_positive, "positive" },
231 { Opt_lookupcache_none, "none" },
232
233 { Opt_lookupcache_err, NULL }
234 };
235
236
237 static void nfs_umount_begin(struct super_block *);
238 static int nfs_statfs(struct dentry *, struct kstatfs *);
239 static int nfs_show_options(struct seq_file *, struct vfsmount *);
240 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
241 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
242 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244 static void nfs_kill_super(struct super_block *);
245 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
246
247 static struct file_system_type nfs_fs_type = {
248 .owner = THIS_MODULE,
249 .name = "nfs",
250 .get_sb = nfs_get_sb,
251 .kill_sb = nfs_kill_super,
252 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
253 };
254
255 struct file_system_type nfs_xdev_fs_type = {
256 .owner = THIS_MODULE,
257 .name = "nfs",
258 .get_sb = nfs_xdev_get_sb,
259 .kill_sb = nfs_kill_super,
260 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
261 };
262
263 static const struct super_operations nfs_sops = {
264 .alloc_inode = nfs_alloc_inode,
265 .destroy_inode = nfs_destroy_inode,
266 .write_inode = nfs_write_inode,
267 .statfs = nfs_statfs,
268 .clear_inode = nfs_clear_inode,
269 .umount_begin = nfs_umount_begin,
270 .show_options = nfs_show_options,
271 .show_stats = nfs_show_stats,
272 .remount_fs = nfs_remount,
273 };
274
275 #ifdef CONFIG_NFS_V4
276 static int nfs4_validate_text_mount_data(void *options,
277 struct nfs_parsed_mount_data *args, const char *dev_name);
278 static int nfs4_try_mount(int flags, const char *dev_name,
279 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
280 static int nfs4_get_sb(struct file_system_type *fs_type,
281 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
282 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
283 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
284 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
285 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
286 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
287 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
288 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
290 static void nfs4_kill_super(struct super_block *sb);
291
292 static struct file_system_type nfs4_fs_type = {
293 .owner = THIS_MODULE,
294 .name = "nfs4",
295 .get_sb = nfs4_get_sb,
296 .kill_sb = nfs4_kill_super,
297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
298 };
299
300 static struct file_system_type nfs4_remote_fs_type = {
301 .owner = THIS_MODULE,
302 .name = "nfs4",
303 .get_sb = nfs4_remote_get_sb,
304 .kill_sb = nfs4_kill_super,
305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
306 };
307
308 struct file_system_type nfs4_xdev_fs_type = {
309 .owner = THIS_MODULE,
310 .name = "nfs4",
311 .get_sb = nfs4_xdev_get_sb,
312 .kill_sb = nfs4_kill_super,
313 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
314 };
315
316 static struct file_system_type nfs4_remote_referral_fs_type = {
317 .owner = THIS_MODULE,
318 .name = "nfs4",
319 .get_sb = nfs4_remote_referral_get_sb,
320 .kill_sb = nfs4_kill_super,
321 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
322 };
323
324 struct file_system_type nfs4_referral_fs_type = {
325 .owner = THIS_MODULE,
326 .name = "nfs4",
327 .get_sb = nfs4_referral_get_sb,
328 .kill_sb = nfs4_kill_super,
329 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
330 };
331
332 static const struct super_operations nfs4_sops = {
333 .alloc_inode = nfs_alloc_inode,
334 .destroy_inode = nfs_destroy_inode,
335 .write_inode = nfs_write_inode,
336 .statfs = nfs_statfs,
337 .clear_inode = nfs4_clear_inode,
338 .umount_begin = nfs_umount_begin,
339 .show_options = nfs_show_options,
340 .show_stats = nfs_show_stats,
341 .remount_fs = nfs_remount,
342 };
343 #endif
344
345 static struct shrinker acl_shrinker = {
346 .shrink = nfs_access_cache_shrinker,
347 .seeks = DEFAULT_SEEKS,
348 };
349
350 /*
351 * Register the NFS filesystems
352 */
353 int __init register_nfs_fs(void)
354 {
355 int ret;
356
357 ret = register_filesystem(&nfs_fs_type);
358 if (ret < 0)
359 goto error_0;
360
361 ret = nfs_register_sysctl();
362 if (ret < 0)
363 goto error_1;
364 #ifdef CONFIG_NFS_V4
365 ret = register_filesystem(&nfs4_fs_type);
366 if (ret < 0)
367 goto error_2;
368 #endif
369 register_shrinker(&acl_shrinker);
370 return 0;
371
372 #ifdef CONFIG_NFS_V4
373 error_2:
374 nfs_unregister_sysctl();
375 #endif
376 error_1:
377 unregister_filesystem(&nfs_fs_type);
378 error_0:
379 return ret;
380 }
381
382 /*
383 * Unregister the NFS filesystems
384 */
385 void __exit unregister_nfs_fs(void)
386 {
387 unregister_shrinker(&acl_shrinker);
388 #ifdef CONFIG_NFS_V4
389 unregister_filesystem(&nfs4_fs_type);
390 #endif
391 nfs_unregister_sysctl();
392 unregister_filesystem(&nfs_fs_type);
393 }
394
395 void nfs_sb_active(struct super_block *sb)
396 {
397 struct nfs_server *server = NFS_SB(sb);
398
399 if (atomic_inc_return(&server->active) == 1)
400 atomic_inc(&sb->s_active);
401 }
402
403 void nfs_sb_deactive(struct super_block *sb)
404 {
405 struct nfs_server *server = NFS_SB(sb);
406
407 if (atomic_dec_and_test(&server->active))
408 deactivate_super(sb);
409 }
410
411 /*
412 * Deliver file system statistics to userspace
413 */
414 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
415 {
416 struct nfs_server *server = NFS_SB(dentry->d_sb);
417 unsigned char blockbits;
418 unsigned long blockres;
419 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
420 struct nfs_fattr fattr;
421 struct nfs_fsstat res = {
422 .fattr = &fattr,
423 };
424 int error;
425
426 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
427 if (error < 0)
428 goto out_err;
429 buf->f_type = NFS_SUPER_MAGIC;
430
431 /*
432 * Current versions of glibc do not correctly handle the
433 * case where f_frsize != f_bsize. Eventually we want to
434 * report the value of wtmult in this field.
435 */
436 buf->f_frsize = dentry->d_sb->s_blocksize;
437
438 /*
439 * On most *nix systems, f_blocks, f_bfree, and f_bavail
440 * are reported in units of f_frsize. Linux hasn't had
441 * an f_frsize field in its statfs struct until recently,
442 * thus historically Linux's sys_statfs reports these
443 * fields in units of f_bsize.
444 */
445 buf->f_bsize = dentry->d_sb->s_blocksize;
446 blockbits = dentry->d_sb->s_blocksize_bits;
447 blockres = (1 << blockbits) - 1;
448 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
449 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
450 buf->f_bavail = (res.abytes + blockres) >> blockbits;
451
452 buf->f_files = res.tfiles;
453 buf->f_ffree = res.afiles;
454
455 buf->f_namelen = server->namelen;
456
457 return 0;
458
459 out_err:
460 dprintk("%s: statfs error = %d\n", __func__, -error);
461 return error;
462 }
463
464 /*
465 * Map the security flavour number to a name
466 */
467 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
468 {
469 static const struct {
470 rpc_authflavor_t flavour;
471 const char *str;
472 } sec_flavours[] = {
473 { RPC_AUTH_NULL, "null" },
474 { RPC_AUTH_UNIX, "sys" },
475 { RPC_AUTH_GSS_KRB5, "krb5" },
476 { RPC_AUTH_GSS_KRB5I, "krb5i" },
477 { RPC_AUTH_GSS_KRB5P, "krb5p" },
478 { RPC_AUTH_GSS_LKEY, "lkey" },
479 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
480 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
481 { RPC_AUTH_GSS_SPKM, "spkm" },
482 { RPC_AUTH_GSS_SPKMI, "spkmi" },
483 { RPC_AUTH_GSS_SPKMP, "spkmp" },
484 { UINT_MAX, "unknown" }
485 };
486 int i;
487
488 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
489 if (sec_flavours[i].flavour == flavour)
490 break;
491 }
492 return sec_flavours[i].str;
493 }
494
495 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
496 int showdefaults)
497 {
498 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
499
500 switch (sap->sa_family) {
501 case AF_INET: {
502 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
503 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
504 break;
505 }
506 case AF_INET6: {
507 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
508 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
509 break;
510 }
511 default:
512 if (showdefaults)
513 seq_printf(m, ",mountaddr=unspecified");
514 }
515
516 if (nfss->mountd_version || showdefaults)
517 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
518 if (nfss->mountd_port || showdefaults)
519 seq_printf(m, ",mountport=%u", nfss->mountd_port);
520
521 switch (nfss->mountd_protocol) {
522 case IPPROTO_UDP:
523 seq_printf(m, ",mountproto=udp");
524 break;
525 case IPPROTO_TCP:
526 seq_printf(m, ",mountproto=tcp");
527 break;
528 default:
529 if (showdefaults)
530 seq_printf(m, ",mountproto=auto");
531 }
532 }
533
534 /*
535 * Describe the mount options in force on this server representation
536 */
537 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
538 int showdefaults)
539 {
540 static const struct proc_nfs_info {
541 int flag;
542 const char *str;
543 const char *nostr;
544 } nfs_info[] = {
545 { NFS_MOUNT_SOFT, ",soft", ",hard" },
546 { NFS_MOUNT_POSIX, ",posix", "" },
547 { NFS_MOUNT_NOCTO, ",nocto", "" },
548 { NFS_MOUNT_NOAC, ",noac", "" },
549 { NFS_MOUNT_NONLM, ",nolock", "" },
550 { NFS_MOUNT_NOACL, ",noacl", "" },
551 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
552 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
553 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
554 { 0, NULL, NULL }
555 };
556 const struct proc_nfs_info *nfs_infop;
557 struct nfs_client *clp = nfss->nfs_client;
558 u32 version = clp->rpc_ops->version;
559
560 seq_printf(m, ",vers=%u", version);
561 seq_printf(m, ",rsize=%u", nfss->rsize);
562 seq_printf(m, ",wsize=%u", nfss->wsize);
563 if (nfss->bsize != 0)
564 seq_printf(m, ",bsize=%u", nfss->bsize);
565 seq_printf(m, ",namlen=%u", nfss->namelen);
566 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
567 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
568 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
569 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
570 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
571 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
572 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
573 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
574 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
575 if (nfss->flags & nfs_infop->flag)
576 seq_puts(m, nfs_infop->str);
577 else
578 seq_puts(m, nfs_infop->nostr);
579 }
580 seq_printf(m, ",proto=%s",
581 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
582 if (version == 4) {
583 if (nfss->port != NFS_PORT)
584 seq_printf(m, ",port=%u", nfss->port);
585 } else
586 if (nfss->port)
587 seq_printf(m, ",port=%u", nfss->port);
588
589 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
590 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
591 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
592
593 if (version != 4)
594 nfs_show_mountd_options(m, nfss, showdefaults);
595
596 #ifdef CONFIG_NFS_V4
597 if (clp->rpc_ops->version == 4)
598 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
599 #endif
600 if (nfss->options & NFS_OPTION_FSCACHE)
601 seq_printf(m, ",fsc");
602 }
603
604 /*
605 * Describe the mount options on this VFS mountpoint
606 */
607 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
608 {
609 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
610
611 nfs_show_mount_options(m, nfss, 0);
612
613 seq_printf(m, ",addr=%s",
614 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
615 RPC_DISPLAY_ADDR));
616
617 return 0;
618 }
619
620 /*
621 * Present statistical information for this VFS mountpoint
622 */
623 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
624 {
625 int i, cpu;
626 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
627 struct rpc_auth *auth = nfss->client->cl_auth;
628 struct nfs_iostats totals = { };
629
630 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
631
632 /*
633 * Display all mount option settings
634 */
635 seq_printf(m, "\n\topts:\t");
636 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
637 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
638 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
639 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
640 nfs_show_mount_options(m, nfss, 1);
641
642 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
643
644 seq_printf(m, "\n\tcaps:\t");
645 seq_printf(m, "caps=0x%x", nfss->caps);
646 seq_printf(m, ",wtmult=%u", nfss->wtmult);
647 seq_printf(m, ",dtsize=%u", nfss->dtsize);
648 seq_printf(m, ",bsize=%u", nfss->bsize);
649 seq_printf(m, ",namlen=%u", nfss->namelen);
650
651 #ifdef CONFIG_NFS_V4
652 if (nfss->nfs_client->rpc_ops->version == 4) {
653 seq_printf(m, "\n\tnfsv4:\t");
654 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
655 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
656 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
657 }
658 #endif
659
660 /*
661 * Display security flavor in effect for this mount
662 */
663 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
664 if (auth->au_flavor)
665 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
666
667 /*
668 * Display superblock I/O counters
669 */
670 for_each_possible_cpu(cpu) {
671 struct nfs_iostats *stats;
672
673 preempt_disable();
674 stats = per_cpu_ptr(nfss->io_stats, cpu);
675
676 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
677 totals.events[i] += stats->events[i];
678 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
679 totals.bytes[i] += stats->bytes[i];
680 #ifdef CONFIG_NFS_FSCACHE
681 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
682 totals.fscache[i] += stats->fscache[i];
683 #endif
684
685 preempt_enable();
686 }
687
688 seq_printf(m, "\n\tevents:\t");
689 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
690 seq_printf(m, "%lu ", totals.events[i]);
691 seq_printf(m, "\n\tbytes:\t");
692 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
693 seq_printf(m, "%Lu ", totals.bytes[i]);
694 #ifdef CONFIG_NFS_FSCACHE
695 if (nfss->options & NFS_OPTION_FSCACHE) {
696 seq_printf(m, "\n\tfsc:\t");
697 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
698 seq_printf(m, "%Lu ", totals.bytes[i]);
699 }
700 #endif
701 seq_printf(m, "\n");
702
703 rpc_print_iostats(m, nfss->client);
704
705 return 0;
706 }
707
708 /*
709 * Begin unmount by attempting to remove all automounted mountpoints we added
710 * in response to xdev traversals and referrals
711 */
712 static void nfs_umount_begin(struct super_block *sb)
713 {
714 struct nfs_server *server;
715 struct rpc_clnt *rpc;
716
717 lock_kernel();
718
719 server = NFS_SB(sb);
720 /* -EIO all pending I/O */
721 rpc = server->client_acl;
722 if (!IS_ERR(rpc))
723 rpc_killall_tasks(rpc);
724 rpc = server->client;
725 if (!IS_ERR(rpc))
726 rpc_killall_tasks(rpc);
727
728 unlock_kernel();
729 }
730
731 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
732 {
733 struct nfs_parsed_mount_data *data;
734
735 data = kzalloc(sizeof(*data), GFP_KERNEL);
736 if (data) {
737 data->rsize = NFS_MAX_FILE_IO_SIZE;
738 data->wsize = NFS_MAX_FILE_IO_SIZE;
739 data->acregmin = NFS_DEF_ACREGMIN;
740 data->acregmax = NFS_DEF_ACREGMAX;
741 data->acdirmin = NFS_DEF_ACDIRMIN;
742 data->acdirmax = NFS_DEF_ACDIRMAX;
743 data->mount_server.port = NFS_UNSPEC_PORT;
744 data->nfs_server.port = NFS_UNSPEC_PORT;
745 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
746 data->auth_flavors[0] = RPC_AUTH_UNIX;
747 data->auth_flavor_len = 1;
748 data->version = version;
749 data->minorversion = 0;
750 }
751 return data;
752 }
753
754 /*
755 * Sanity-check a server address provided by the mount command.
756 *
757 * Address family must be initialized, and address must not be
758 * the ANY address for that family.
759 */
760 static int nfs_verify_server_address(struct sockaddr *addr)
761 {
762 switch (addr->sa_family) {
763 case AF_INET: {
764 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
765 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
766 }
767 case AF_INET6: {
768 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
769 return !ipv6_addr_any(sa);
770 }
771 }
772
773 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
774 return 0;
775 }
776
777 /*
778 * Select between a default port value and a user-specified port value.
779 * If a zero value is set, then autobind will be used.
780 */
781 static void nfs_set_port(struct sockaddr *sap, int *port,
782 const unsigned short default_port)
783 {
784 if (*port == NFS_UNSPEC_PORT)
785 *port = default_port;
786
787 rpc_set_port(sap, *port);
788 }
789
790 /*
791 * Sanity check the NFS transport protocol.
792 *
793 */
794 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
795 {
796 switch (mnt->nfs_server.protocol) {
797 case XPRT_TRANSPORT_UDP:
798 case XPRT_TRANSPORT_TCP:
799 case XPRT_TRANSPORT_RDMA:
800 break;
801 default:
802 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
803 }
804 }
805
806 /*
807 * For text based NFSv2/v3 mounts, the mount protocol transport default
808 * settings should depend upon the specified NFS transport.
809 */
810 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
811 {
812 nfs_validate_transport_protocol(mnt);
813
814 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
815 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
816 return;
817 switch (mnt->nfs_server.protocol) {
818 case XPRT_TRANSPORT_UDP:
819 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
820 break;
821 case XPRT_TRANSPORT_TCP:
822 case XPRT_TRANSPORT_RDMA:
823 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
824 }
825 }
826
827 /*
828 * Parse the value of the 'sec=' option.
829 */
830 static int nfs_parse_security_flavors(char *value,
831 struct nfs_parsed_mount_data *mnt)
832 {
833 substring_t args[MAX_OPT_ARGS];
834
835 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
836
837 switch (match_token(value, nfs_secflavor_tokens, args)) {
838 case Opt_sec_none:
839 mnt->auth_flavors[0] = RPC_AUTH_NULL;
840 break;
841 case Opt_sec_sys:
842 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
843 break;
844 case Opt_sec_krb5:
845 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
846 break;
847 case Opt_sec_krb5i:
848 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
849 break;
850 case Opt_sec_krb5p:
851 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
852 break;
853 case Opt_sec_lkey:
854 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
855 break;
856 case Opt_sec_lkeyi:
857 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
858 break;
859 case Opt_sec_lkeyp:
860 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
861 break;
862 case Opt_sec_spkm:
863 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
864 break;
865 case Opt_sec_spkmi:
866 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
867 break;
868 case Opt_sec_spkmp:
869 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
870 break;
871 default:
872 return 0;
873 }
874
875 mnt->auth_flavor_len = 1;
876 return 1;
877 }
878
879 /*
880 * Error-check and convert a string of mount options from user space into
881 * a data structure. The whole mount string is processed; bad options are
882 * skipped as they are encountered. If there were no errors, return 1;
883 * otherwise return 0 (zero).
884 */
885 static int nfs_parse_mount_options(char *raw,
886 struct nfs_parsed_mount_data *mnt)
887 {
888 char *p, *string, *secdata;
889 int rc, sloppy = 0, invalid_option = 0;
890
891 if (!raw) {
892 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
893 return 1;
894 }
895 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
896
897 secdata = alloc_secdata();
898 if (!secdata)
899 goto out_nomem;
900
901 rc = security_sb_copy_data(raw, secdata);
902 if (rc)
903 goto out_security_failure;
904
905 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
906 if (rc)
907 goto out_security_failure;
908
909 free_secdata(secdata);
910
911 while ((p = strsep(&raw, ",")) != NULL) {
912 substring_t args[MAX_OPT_ARGS];
913 unsigned long option;
914 int token;
915
916 if (!*p)
917 continue;
918
919 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
920
921 token = match_token(p, nfs_mount_option_tokens, args);
922 switch (token) {
923
924 /*
925 * boolean options: foo/nofoo
926 */
927 case Opt_soft:
928 mnt->flags |= NFS_MOUNT_SOFT;
929 break;
930 case Opt_hard:
931 mnt->flags &= ~NFS_MOUNT_SOFT;
932 break;
933 case Opt_posix:
934 mnt->flags |= NFS_MOUNT_POSIX;
935 break;
936 case Opt_noposix:
937 mnt->flags &= ~NFS_MOUNT_POSIX;
938 break;
939 case Opt_cto:
940 mnt->flags &= ~NFS_MOUNT_NOCTO;
941 break;
942 case Opt_nocto:
943 mnt->flags |= NFS_MOUNT_NOCTO;
944 break;
945 case Opt_ac:
946 mnt->flags &= ~NFS_MOUNT_NOAC;
947 break;
948 case Opt_noac:
949 mnt->flags |= NFS_MOUNT_NOAC;
950 break;
951 case Opt_lock:
952 mnt->flags &= ~NFS_MOUNT_NONLM;
953 break;
954 case Opt_nolock:
955 mnt->flags |= NFS_MOUNT_NONLM;
956 break;
957 case Opt_v2:
958 mnt->flags &= ~NFS_MOUNT_VER3;
959 mnt->version = 2;
960 break;
961 case Opt_v3:
962 mnt->flags |= NFS_MOUNT_VER3;
963 mnt->version = 3;
964 break;
965 #ifdef CONFIG_NFS_V4
966 case Opt_v4:
967 mnt->flags &= ~NFS_MOUNT_VER3;
968 mnt->version = 4;
969 break;
970 #endif
971 case Opt_udp:
972 mnt->flags &= ~NFS_MOUNT_TCP;
973 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
974 break;
975 case Opt_tcp:
976 mnt->flags |= NFS_MOUNT_TCP;
977 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
978 break;
979 case Opt_rdma:
980 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
981 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
982 xprt_load_transport(p);
983 break;
984 case Opt_acl:
985 mnt->flags &= ~NFS_MOUNT_NOACL;
986 break;
987 case Opt_noacl:
988 mnt->flags |= NFS_MOUNT_NOACL;
989 break;
990 case Opt_rdirplus:
991 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
992 break;
993 case Opt_nordirplus:
994 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
995 break;
996 case Opt_sharecache:
997 mnt->flags &= ~NFS_MOUNT_UNSHARED;
998 break;
999 case Opt_nosharecache:
1000 mnt->flags |= NFS_MOUNT_UNSHARED;
1001 break;
1002 case Opt_resvport:
1003 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1004 break;
1005 case Opt_noresvport:
1006 mnt->flags |= NFS_MOUNT_NORESVPORT;
1007 break;
1008 case Opt_fscache:
1009 mnt->options |= NFS_OPTION_FSCACHE;
1010 kfree(mnt->fscache_uniq);
1011 mnt->fscache_uniq = NULL;
1012 break;
1013 case Opt_nofscache:
1014 mnt->options &= ~NFS_OPTION_FSCACHE;
1015 kfree(mnt->fscache_uniq);
1016 mnt->fscache_uniq = NULL;
1017 break;
1018 case Opt_fscache_uniq:
1019 string = match_strdup(args);
1020 if (!string)
1021 goto out_nomem;
1022 kfree(mnt->fscache_uniq);
1023 mnt->fscache_uniq = string;
1024 mnt->options |= NFS_OPTION_FSCACHE;
1025 break;
1026
1027 /*
1028 * options that take numeric values
1029 */
1030 case Opt_port:
1031 string = match_strdup(args);
1032 if (string == NULL)
1033 goto out_nomem;
1034 rc = strict_strtoul(string, 10, &option);
1035 kfree(string);
1036 if (rc != 0 || option > USHORT_MAX)
1037 goto out_invalid_value;
1038 mnt->nfs_server.port = option;
1039 break;
1040 case Opt_rsize:
1041 string = match_strdup(args);
1042 if (string == NULL)
1043 goto out_nomem;
1044 rc = strict_strtoul(string, 10, &option);
1045 kfree(string);
1046 if (rc != 0)
1047 goto out_invalid_value;
1048 mnt->rsize = option;
1049 break;
1050 case Opt_wsize:
1051 string = match_strdup(args);
1052 if (string == NULL)
1053 goto out_nomem;
1054 rc = strict_strtoul(string, 10, &option);
1055 kfree(string);
1056 if (rc != 0)
1057 goto out_invalid_value;
1058 mnt->wsize = option;
1059 break;
1060 case Opt_bsize:
1061 string = match_strdup(args);
1062 if (string == NULL)
1063 goto out_nomem;
1064 rc = strict_strtoul(string, 10, &option);
1065 kfree(string);
1066 if (rc != 0)
1067 goto out_invalid_value;
1068 mnt->bsize = option;
1069 break;
1070 case Opt_timeo:
1071 string = match_strdup(args);
1072 if (string == NULL)
1073 goto out_nomem;
1074 rc = strict_strtoul(string, 10, &option);
1075 kfree(string);
1076 if (rc != 0 || option == 0)
1077 goto out_invalid_value;
1078 mnt->timeo = option;
1079 break;
1080 case Opt_retrans:
1081 string = match_strdup(args);
1082 if (string == NULL)
1083 goto out_nomem;
1084 rc = strict_strtoul(string, 10, &option);
1085 kfree(string);
1086 if (rc != 0 || option == 0)
1087 goto out_invalid_value;
1088 mnt->retrans = option;
1089 break;
1090 case Opt_acregmin:
1091 string = match_strdup(args);
1092 if (string == NULL)
1093 goto out_nomem;
1094 rc = strict_strtoul(string, 10, &option);
1095 kfree(string);
1096 if (rc != 0)
1097 goto out_invalid_value;
1098 mnt->acregmin = option;
1099 break;
1100 case Opt_acregmax:
1101 string = match_strdup(args);
1102 if (string == NULL)
1103 goto out_nomem;
1104 rc = strict_strtoul(string, 10, &option);
1105 kfree(string);
1106 if (rc != 0)
1107 goto out_invalid_value;
1108 mnt->acregmax = option;
1109 break;
1110 case Opt_acdirmin:
1111 string = match_strdup(args);
1112 if (string == NULL)
1113 goto out_nomem;
1114 rc = strict_strtoul(string, 10, &option);
1115 kfree(string);
1116 if (rc != 0)
1117 goto out_invalid_value;
1118 mnt->acdirmin = option;
1119 break;
1120 case Opt_acdirmax:
1121 string = match_strdup(args);
1122 if (string == NULL)
1123 goto out_nomem;
1124 rc = strict_strtoul(string, 10, &option);
1125 kfree(string);
1126 if (rc != 0)
1127 goto out_invalid_value;
1128 mnt->acdirmax = option;
1129 break;
1130 case Opt_actimeo:
1131 string = match_strdup(args);
1132 if (string == NULL)
1133 goto out_nomem;
1134 rc = strict_strtoul(string, 10, &option);
1135 kfree(string);
1136 if (rc != 0)
1137 goto out_invalid_value;
1138 mnt->acregmin = mnt->acregmax =
1139 mnt->acdirmin = mnt->acdirmax = option;
1140 break;
1141 case Opt_namelen:
1142 string = match_strdup(args);
1143 if (string == NULL)
1144 goto out_nomem;
1145 rc = strict_strtoul(string, 10, &option);
1146 kfree(string);
1147 if (rc != 0)
1148 goto out_invalid_value;
1149 mnt->namlen = option;
1150 break;
1151 case Opt_mountport:
1152 string = match_strdup(args);
1153 if (string == NULL)
1154 goto out_nomem;
1155 rc = strict_strtoul(string, 10, &option);
1156 kfree(string);
1157 if (rc != 0 || option > USHORT_MAX)
1158 goto out_invalid_value;
1159 mnt->mount_server.port = option;
1160 break;
1161 case Opt_mountvers:
1162 string = match_strdup(args);
1163 if (string == NULL)
1164 goto out_nomem;
1165 rc = strict_strtoul(string, 10, &option);
1166 kfree(string);
1167 if (rc != 0 ||
1168 option < NFS_MNT_VERSION ||
1169 option > NFS_MNT3_VERSION)
1170 goto out_invalid_value;
1171 mnt->mount_server.version = option;
1172 break;
1173 case Opt_nfsvers:
1174 string = match_strdup(args);
1175 if (string == NULL)
1176 goto out_nomem;
1177 rc = strict_strtoul(string, 10, &option);
1178 kfree(string);
1179 if (rc != 0)
1180 goto out_invalid_value;
1181 switch (option) {
1182 case NFS2_VERSION:
1183 mnt->flags &= ~NFS_MOUNT_VER3;
1184 mnt->version = 2;
1185 break;
1186 case NFS3_VERSION:
1187 mnt->flags |= NFS_MOUNT_VER3;
1188 mnt->version = 3;
1189 break;
1190 #ifdef CONFIG_NFS_V4
1191 case NFS4_VERSION:
1192 mnt->flags &= ~NFS_MOUNT_VER3;
1193 mnt->version = 4;
1194 break;
1195 #endif
1196 default:
1197 goto out_invalid_value;
1198 }
1199 break;
1200 case Opt_minorversion:
1201 string = match_strdup(args);
1202 if (string == NULL)
1203 goto out_nomem;
1204 rc = strict_strtoul(string, 10, &option);
1205 kfree(string);
1206 if (rc != 0)
1207 goto out_invalid_value;
1208 if (option > NFS4_MAX_MINOR_VERSION)
1209 goto out_invalid_value;
1210 mnt->minorversion = option;
1211 break;
1212
1213 /*
1214 * options that take text values
1215 */
1216 case Opt_sec:
1217 string = match_strdup(args);
1218 if (string == NULL)
1219 goto out_nomem;
1220 rc = nfs_parse_security_flavors(string, mnt);
1221 kfree(string);
1222 if (!rc) {
1223 dfprintk(MOUNT, "NFS: unrecognized "
1224 "security flavor\n");
1225 return 0;
1226 }
1227 break;
1228 case Opt_proto:
1229 string = match_strdup(args);
1230 if (string == NULL)
1231 goto out_nomem;
1232 token = match_token(string,
1233 nfs_xprt_protocol_tokens, args);
1234
1235 switch (token) {
1236 case Opt_xprt_udp:
1237 mnt->flags &= ~NFS_MOUNT_TCP;
1238 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1239 kfree(string);
1240 break;
1241 case Opt_xprt_tcp:
1242 mnt->flags |= NFS_MOUNT_TCP;
1243 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1244 kfree(string);
1245 break;
1246 case Opt_xprt_rdma:
1247 /* vector side protocols to TCP */
1248 mnt->flags |= NFS_MOUNT_TCP;
1249 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1250 xprt_load_transport(string);
1251 kfree(string);
1252 break;
1253 default:
1254 dfprintk(MOUNT, "NFS: unrecognized "
1255 "transport protocol\n");
1256 kfree(string);
1257 return 0;
1258 }
1259 break;
1260 case Opt_mountproto:
1261 string = match_strdup(args);
1262 if (string == NULL)
1263 goto out_nomem;
1264 token = match_token(string,
1265 nfs_xprt_protocol_tokens, args);
1266 kfree(string);
1267
1268 switch (token) {
1269 case Opt_xprt_udp:
1270 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1271 break;
1272 case Opt_xprt_tcp:
1273 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1274 break;
1275 case Opt_xprt_rdma: /* not used for side protocols */
1276 default:
1277 dfprintk(MOUNT, "NFS: unrecognized "
1278 "transport protocol\n");
1279 return 0;
1280 }
1281 break;
1282 case Opt_addr:
1283 string = match_strdup(args);
1284 if (string == NULL)
1285 goto out_nomem;
1286 mnt->nfs_server.addrlen =
1287 rpc_pton(string, strlen(string),
1288 (struct sockaddr *)
1289 &mnt->nfs_server.address,
1290 sizeof(mnt->nfs_server.address));
1291 kfree(string);
1292 if (mnt->nfs_server.addrlen == 0)
1293 goto out_invalid_address;
1294 break;
1295 case Opt_clientaddr:
1296 string = match_strdup(args);
1297 if (string == NULL)
1298 goto out_nomem;
1299 kfree(mnt->client_address);
1300 mnt->client_address = string;
1301 break;
1302 case Opt_mounthost:
1303 string = match_strdup(args);
1304 if (string == NULL)
1305 goto out_nomem;
1306 kfree(mnt->mount_server.hostname);
1307 mnt->mount_server.hostname = string;
1308 break;
1309 case Opt_mountaddr:
1310 string = match_strdup(args);
1311 if (string == NULL)
1312 goto out_nomem;
1313 mnt->mount_server.addrlen =
1314 rpc_pton(string, strlen(string),
1315 (struct sockaddr *)
1316 &mnt->mount_server.address,
1317 sizeof(mnt->mount_server.address));
1318 kfree(string);
1319 if (mnt->mount_server.addrlen == 0)
1320 goto out_invalid_address;
1321 break;
1322 case Opt_lookupcache:
1323 string = match_strdup(args);
1324 if (string == NULL)
1325 goto out_nomem;
1326 token = match_token(string,
1327 nfs_lookupcache_tokens, args);
1328 kfree(string);
1329 switch (token) {
1330 case Opt_lookupcache_all:
1331 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1332 break;
1333 case Opt_lookupcache_positive:
1334 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1335 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1336 break;
1337 case Opt_lookupcache_none:
1338 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1339 break;
1340 default:
1341 dfprintk(MOUNT, "NFS: invalid "
1342 "lookupcache argument\n");
1343 return 0;
1344 };
1345 break;
1346
1347 /*
1348 * Special options
1349 */
1350 case Opt_sloppy:
1351 sloppy = 1;
1352 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1353 break;
1354 case Opt_userspace:
1355 case Opt_deprecated:
1356 dfprintk(MOUNT, "NFS: ignoring mount option "
1357 "'%s'\n", p);
1358 break;
1359
1360 default:
1361 invalid_option = 1;
1362 dfprintk(MOUNT, "NFS: unrecognized mount option "
1363 "'%s'\n", p);
1364 }
1365 }
1366
1367 if (!sloppy && invalid_option)
1368 return 0;
1369
1370 return 1;
1371
1372 out_invalid_address:
1373 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1374 return 0;
1375 out_invalid_value:
1376 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1377 return 0;
1378 out_nomem:
1379 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1380 return 0;
1381 out_security_failure:
1382 free_secdata(secdata);
1383 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1384 return 0;
1385 }
1386
1387 /*
1388 * Match the requested auth flavors with the list returned by
1389 * the server. Returns zero and sets the mount's authentication
1390 * flavor on success; returns -EACCES if server does not support
1391 * the requested flavor.
1392 */
1393 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1394 struct nfs_mount_request *request)
1395 {
1396 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1397
1398 /*
1399 * Certain releases of Linux's mountd return an empty
1400 * flavor list. To prevent behavioral regression with
1401 * these servers (ie. rejecting mounts that used to
1402 * succeed), revert to pre-2.6.32 behavior (no checking)
1403 * if the returned flavor list is empty.
1404 */
1405 if (server_authlist_len == 0)
1406 return 0;
1407
1408 /*
1409 * We avoid sophisticated negotiating here, as there are
1410 * plenty of cases where we can get it wrong, providing
1411 * either too little or too much security.
1412 *
1413 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1414 * flavor listed first. However, some servers list
1415 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1416 * preferred default, in args->auth_flavors[0] if user
1417 * didn't specify sec= mount option.
1418 */
1419 for (i = 0; i < args->auth_flavor_len; i++)
1420 for (j = 0; j < server_authlist_len; j++)
1421 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1422 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1423 request->auth_flavs[j]);
1424 args->auth_flavors[0] = request->auth_flavs[j];
1425 return 0;
1426 }
1427
1428 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1429 nfs_umount(request);
1430 return -EACCES;
1431 }
1432
1433 /*
1434 * Use the remote server's MOUNT service to request the NFS file handle
1435 * corresponding to the provided path.
1436 */
1437 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1438 struct nfs_fh *root_fh)
1439 {
1440 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1441 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1442 struct nfs_mount_request request = {
1443 .sap = (struct sockaddr *)
1444 &args->mount_server.address,
1445 .dirpath = args->nfs_server.export_path,
1446 .protocol = args->mount_server.protocol,
1447 .fh = root_fh,
1448 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1449 .auth_flav_len = &server_authlist_len,
1450 .auth_flavs = server_authlist,
1451 };
1452 int status;
1453
1454 if (args->mount_server.version == 0) {
1455 switch (args->version) {
1456 default:
1457 args->mount_server.version = NFS_MNT3_VERSION;
1458 break;
1459 case 2:
1460 args->mount_server.version = NFS_MNT_VERSION;
1461 }
1462 }
1463 request.version = args->mount_server.version;
1464
1465 if (args->mount_server.hostname)
1466 request.hostname = args->mount_server.hostname;
1467 else
1468 request.hostname = args->nfs_server.hostname;
1469
1470 /*
1471 * Construct the mount server's address.
1472 */
1473 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1474 memcpy(request.sap, &args->nfs_server.address,
1475 args->nfs_server.addrlen);
1476 args->mount_server.addrlen = args->nfs_server.addrlen;
1477 }
1478 request.salen = args->mount_server.addrlen;
1479 nfs_set_port(request.sap, &args->mount_server.port, 0);
1480
1481 /*
1482 * Now ask the mount server to map our export path
1483 * to a file handle.
1484 */
1485 status = nfs_mount(&request);
1486 if (status != 0) {
1487 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1488 request.hostname, status);
1489 return status;
1490 }
1491
1492 /*
1493 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1494 */
1495 if (args->mount_server.version != NFS_MNT3_VERSION)
1496 return 0;
1497 return nfs_walk_authlist(args, &request);
1498 }
1499
1500 static int nfs_parse_simple_hostname(const char *dev_name,
1501 char **hostname, size_t maxnamlen,
1502 char **export_path, size_t maxpathlen)
1503 {
1504 size_t len;
1505 char *colon, *comma;
1506
1507 colon = strchr(dev_name, ':');
1508 if (colon == NULL)
1509 goto out_bad_devname;
1510
1511 len = colon - dev_name;
1512 if (len > maxnamlen)
1513 goto out_hostname;
1514
1515 /* N.B. caller will free nfs_server.hostname in all cases */
1516 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1517 if (!*hostname)
1518 goto out_nomem;
1519
1520 /* kill possible hostname list: not supported */
1521 comma = strchr(*hostname, ',');
1522 if (comma != NULL) {
1523 if (comma == *hostname)
1524 goto out_bad_devname;
1525 *comma = '\0';
1526 }
1527
1528 colon++;
1529 len = strlen(colon);
1530 if (len > maxpathlen)
1531 goto out_path;
1532 *export_path = kstrndup(colon, len, GFP_KERNEL);
1533 if (!*export_path)
1534 goto out_nomem;
1535
1536 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1537 return 0;
1538
1539 out_bad_devname:
1540 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1541 return -EINVAL;
1542
1543 out_nomem:
1544 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1545 return -ENOMEM;
1546
1547 out_hostname:
1548 dfprintk(MOUNT, "NFS: server hostname too long\n");
1549 return -ENAMETOOLONG;
1550
1551 out_path:
1552 dfprintk(MOUNT, "NFS: export pathname too long\n");
1553 return -ENAMETOOLONG;
1554 }
1555
1556 /*
1557 * Hostname has square brackets around it because it contains one or
1558 * more colons. We look for the first closing square bracket, and a
1559 * colon must follow it.
1560 */
1561 static int nfs_parse_protected_hostname(const char *dev_name,
1562 char **hostname, size_t maxnamlen,
1563 char **export_path, size_t maxpathlen)
1564 {
1565 size_t len;
1566 char *start, *end;
1567
1568 start = (char *)(dev_name + 1);
1569
1570 end = strchr(start, ']');
1571 if (end == NULL)
1572 goto out_bad_devname;
1573 if (*(end + 1) != ':')
1574 goto out_bad_devname;
1575
1576 len = end - start;
1577 if (len > maxnamlen)
1578 goto out_hostname;
1579
1580 /* N.B. caller will free nfs_server.hostname in all cases */
1581 *hostname = kstrndup(start, len, GFP_KERNEL);
1582 if (*hostname == NULL)
1583 goto out_nomem;
1584
1585 end += 2;
1586 len = strlen(end);
1587 if (len > maxpathlen)
1588 goto out_path;
1589 *export_path = kstrndup(end, len, GFP_KERNEL);
1590 if (!*export_path)
1591 goto out_nomem;
1592
1593 return 0;
1594
1595 out_bad_devname:
1596 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1597 return -EINVAL;
1598
1599 out_nomem:
1600 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1601 return -ENOMEM;
1602
1603 out_hostname:
1604 dfprintk(MOUNT, "NFS: server hostname too long\n");
1605 return -ENAMETOOLONG;
1606
1607 out_path:
1608 dfprintk(MOUNT, "NFS: export pathname too long\n");
1609 return -ENAMETOOLONG;
1610 }
1611
1612 /*
1613 * Split "dev_name" into "hostname:export_path".
1614 *
1615 * The leftmost colon demarks the split between the server's hostname
1616 * and the export path. If the hostname starts with a left square
1617 * bracket, then it may contain colons.
1618 *
1619 * Note: caller frees hostname and export path, even on error.
1620 */
1621 static int nfs_parse_devname(const char *dev_name,
1622 char **hostname, size_t maxnamlen,
1623 char **export_path, size_t maxpathlen)
1624 {
1625 if (*dev_name == '[')
1626 return nfs_parse_protected_hostname(dev_name,
1627 hostname, maxnamlen,
1628 export_path, maxpathlen);
1629
1630 return nfs_parse_simple_hostname(dev_name,
1631 hostname, maxnamlen,
1632 export_path, maxpathlen);
1633 }
1634
1635 /*
1636 * Validate the NFS2/NFS3 mount data
1637 * - fills in the mount root filehandle
1638 *
1639 * For option strings, user space handles the following behaviors:
1640 *
1641 * + DNS: mapping server host name to IP address ("addr=" option)
1642 *
1643 * + failure mode: how to behave if a mount request can't be handled
1644 * immediately ("fg/bg" option)
1645 *
1646 * + retry: how often to retry a mount request ("retry=" option)
1647 *
1648 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1649 * mountproto=tcp after mountproto=udp, and so on
1650 */
1651 static int nfs_validate_mount_data(void *options,
1652 struct nfs_parsed_mount_data *args,
1653 struct nfs_fh *mntfh,
1654 const char *dev_name)
1655 {
1656 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1657 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1658
1659 if (data == NULL)
1660 goto out_no_data;
1661
1662 switch (data->version) {
1663 case 1:
1664 data->namlen = 0;
1665 case 2:
1666 data->bsize = 0;
1667 case 3:
1668 if (data->flags & NFS_MOUNT_VER3)
1669 goto out_no_v3;
1670 data->root.size = NFS2_FHSIZE;
1671 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1672 case 4:
1673 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1674 goto out_no_sec;
1675 case 5:
1676 memset(data->context, 0, sizeof(data->context));
1677 case 6:
1678 if (data->flags & NFS_MOUNT_VER3) {
1679 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1680 goto out_invalid_fh;
1681 mntfh->size = data->root.size;
1682 args->version = 3;
1683 } else {
1684 mntfh->size = NFS2_FHSIZE;
1685 args->version = 2;
1686 }
1687
1688
1689 memcpy(mntfh->data, data->root.data, mntfh->size);
1690 if (mntfh->size < sizeof(mntfh->data))
1691 memset(mntfh->data + mntfh->size, 0,
1692 sizeof(mntfh->data) - mntfh->size);
1693
1694 /*
1695 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1696 * can deal with.
1697 */
1698 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1699 args->rsize = data->rsize;
1700 args->wsize = data->wsize;
1701 args->timeo = data->timeo;
1702 args->retrans = data->retrans;
1703 args->acregmin = data->acregmin;
1704 args->acregmax = data->acregmax;
1705 args->acdirmin = data->acdirmin;
1706 args->acdirmax = data->acdirmax;
1707
1708 memcpy(sap, &data->addr, sizeof(data->addr));
1709 args->nfs_server.addrlen = sizeof(data->addr);
1710 if (!nfs_verify_server_address(sap))
1711 goto out_no_address;
1712
1713 if (!(data->flags & NFS_MOUNT_TCP))
1714 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1715 /* N.B. caller will free nfs_server.hostname in all cases */
1716 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1717 args->namlen = data->namlen;
1718 args->bsize = data->bsize;
1719
1720 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1721 args->auth_flavors[0] = data->pseudoflavor;
1722 if (!args->nfs_server.hostname)
1723 goto out_nomem;
1724
1725 /*
1726 * The legacy version 6 binary mount data from userspace has a
1727 * field used only to transport selinux information into the
1728 * the kernel. To continue to support that functionality we
1729 * have a touch of selinux knowledge here in the NFS code. The
1730 * userspace code converted context=blah to just blah so we are
1731 * converting back to the full string selinux understands.
1732 */
1733 if (data->context[0]){
1734 #ifdef CONFIG_SECURITY_SELINUX
1735 int rc;
1736 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1737 if (!opts_str)
1738 return -ENOMEM;
1739 strcpy(opts_str, "context=");
1740 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1741 strcat(opts_str, &data->context[0]);
1742 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1743 kfree(opts_str);
1744 if (rc)
1745 return rc;
1746 #else
1747 return -EINVAL;
1748 #endif
1749 }
1750
1751 break;
1752 default: {
1753 int status;
1754
1755 if (nfs_parse_mount_options((char *)options, args) == 0)
1756 return -EINVAL;
1757
1758 if (!nfs_verify_server_address(sap))
1759 goto out_no_address;
1760
1761 if (args->version == 4)
1762 #ifdef CONFIG_NFS_V4
1763 return nfs4_validate_text_mount_data(options,
1764 args, dev_name);
1765 #else
1766 goto out_v4_not_compiled;
1767 #endif
1768
1769 nfs_set_port(sap, &args->nfs_server.port, 0);
1770
1771 nfs_set_mount_transport_protocol(args);
1772
1773 status = nfs_parse_devname(dev_name,
1774 &args->nfs_server.hostname,
1775 PAGE_SIZE,
1776 &args->nfs_server.export_path,
1777 NFS_MAXPATHLEN);
1778 if (!status)
1779 status = nfs_try_mount(args, mntfh);
1780
1781 kfree(args->nfs_server.export_path);
1782 args->nfs_server.export_path = NULL;
1783
1784 if (status)
1785 return status;
1786
1787 break;
1788 }
1789 }
1790
1791 #ifndef CONFIG_NFS_V3
1792 if (args->version == 3)
1793 goto out_v3_not_compiled;
1794 #endif /* !CONFIG_NFS_V3 */
1795
1796 return 0;
1797
1798 out_no_data:
1799 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1800 return -EINVAL;
1801
1802 out_no_v3:
1803 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1804 data->version);
1805 return -EINVAL;
1806
1807 out_no_sec:
1808 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1809 return -EINVAL;
1810
1811 #ifndef CONFIG_NFS_V3
1812 out_v3_not_compiled:
1813 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1814 return -EPROTONOSUPPORT;
1815 #endif /* !CONFIG_NFS_V3 */
1816
1817 #ifndef CONFIG_NFS_V4
1818 out_v4_not_compiled:
1819 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1820 return -EPROTONOSUPPORT;
1821 #endif /* !CONFIG_NFS_V4 */
1822
1823 out_nomem:
1824 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1825 return -ENOMEM;
1826
1827 out_no_address:
1828 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1829 return -EINVAL;
1830
1831 out_invalid_fh:
1832 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1833 return -EINVAL;
1834 }
1835
1836 static int
1837 nfs_compare_remount_data(struct nfs_server *nfss,
1838 struct nfs_parsed_mount_data *data)
1839 {
1840 if (data->flags != nfss->flags ||
1841 data->rsize != nfss->rsize ||
1842 data->wsize != nfss->wsize ||
1843 data->retrans != nfss->client->cl_timeout->to_retries ||
1844 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1845 data->acregmin != nfss->acregmin / HZ ||
1846 data->acregmax != nfss->acregmax / HZ ||
1847 data->acdirmin != nfss->acdirmin / HZ ||
1848 data->acdirmax != nfss->acdirmax / HZ ||
1849 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1850 data->nfs_server.port != nfss->port ||
1851 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1852 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1853 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1854 return -EINVAL;
1855
1856 return 0;
1857 }
1858
1859 static int
1860 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1861 {
1862 int error;
1863 struct nfs_server *nfss = sb->s_fs_info;
1864 struct nfs_parsed_mount_data *data;
1865 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1866 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1867 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1868
1869 /*
1870 * Userspace mount programs that send binary options generally send
1871 * them populated with default values. We have no way to know which
1872 * ones were explicitly specified. Fall back to legacy behavior and
1873 * just return success.
1874 */
1875 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1876 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1877 options->version <= 6))))
1878 return 0;
1879
1880 data = kzalloc(sizeof(*data), GFP_KERNEL);
1881 if (data == NULL)
1882 return -ENOMEM;
1883
1884 lock_kernel();
1885 /* fill out struct with values from existing mount */
1886 data->flags = nfss->flags;
1887 data->rsize = nfss->rsize;
1888 data->wsize = nfss->wsize;
1889 data->retrans = nfss->client->cl_timeout->to_retries;
1890 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1891 data->acregmin = nfss->acregmin / HZ;
1892 data->acregmax = nfss->acregmax / HZ;
1893 data->acdirmin = nfss->acdirmin / HZ;
1894 data->acdirmax = nfss->acdirmax / HZ;
1895 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1896 data->nfs_server.port = nfss->port;
1897 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1898 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1899 data->nfs_server.addrlen);
1900
1901 /* overwrite those values with any that were specified */
1902 error = nfs_parse_mount_options((char *)options, data);
1903 if (error < 0)
1904 goto out;
1905
1906 /* compare new mount options with old ones */
1907 error = nfs_compare_remount_data(nfss, data);
1908 out:
1909 kfree(data);
1910 unlock_kernel();
1911 return error;
1912 }
1913
1914 /*
1915 * Initialise the common bits of the superblock
1916 */
1917 static inline void nfs_initialise_sb(struct super_block *sb)
1918 {
1919 struct nfs_server *server = NFS_SB(sb);
1920
1921 sb->s_magic = NFS_SUPER_MAGIC;
1922
1923 /* We probably want something more informative here */
1924 snprintf(sb->s_id, sizeof(sb->s_id),
1925 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1926
1927 if (sb->s_blocksize == 0)
1928 sb->s_blocksize = nfs_block_bits(server->wsize,
1929 &sb->s_blocksize_bits);
1930
1931 if (server->flags & NFS_MOUNT_NOAC)
1932 sb->s_flags |= MS_SYNCHRONOUS;
1933
1934 sb->s_bdi = &server->backing_dev_info;
1935
1936 nfs_super_set_maxbytes(sb, server->maxfilesize);
1937 }
1938
1939 /*
1940 * Finish setting up an NFS2/3 superblock
1941 */
1942 static void nfs_fill_super(struct super_block *sb,
1943 struct nfs_parsed_mount_data *data)
1944 {
1945 struct nfs_server *server = NFS_SB(sb);
1946
1947 sb->s_blocksize_bits = 0;
1948 sb->s_blocksize = 0;
1949 if (data->bsize)
1950 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1951
1952 if (server->nfs_client->rpc_ops->version == 3) {
1953 /* The VFS shouldn't apply the umask to mode bits. We will do
1954 * so ourselves when necessary.
1955 */
1956 sb->s_flags |= MS_POSIXACL;
1957 sb->s_time_gran = 1;
1958 }
1959
1960 sb->s_op = &nfs_sops;
1961 nfs_initialise_sb(sb);
1962 }
1963
1964 /*
1965 * Finish setting up a cloned NFS2/3 superblock
1966 */
1967 static void nfs_clone_super(struct super_block *sb,
1968 const struct super_block *old_sb)
1969 {
1970 struct nfs_server *server = NFS_SB(sb);
1971
1972 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1973 sb->s_blocksize = old_sb->s_blocksize;
1974 sb->s_maxbytes = old_sb->s_maxbytes;
1975
1976 if (server->nfs_client->rpc_ops->version == 3) {
1977 /* The VFS shouldn't apply the umask to mode bits. We will do
1978 * so ourselves when necessary.
1979 */
1980 sb->s_flags |= MS_POSIXACL;
1981 sb->s_time_gran = 1;
1982 }
1983
1984 sb->s_op = old_sb->s_op;
1985 nfs_initialise_sb(sb);
1986 }
1987
1988 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1989 {
1990 const struct nfs_server *a = s->s_fs_info;
1991 const struct rpc_clnt *clnt_a = a->client;
1992 const struct rpc_clnt *clnt_b = b->client;
1993
1994 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1995 goto Ebusy;
1996 if (a->nfs_client != b->nfs_client)
1997 goto Ebusy;
1998 if (a->flags != b->flags)
1999 goto Ebusy;
2000 if (a->wsize != b->wsize)
2001 goto Ebusy;
2002 if (a->rsize != b->rsize)
2003 goto Ebusy;
2004 if (a->acregmin != b->acregmin)
2005 goto Ebusy;
2006 if (a->acregmax != b->acregmax)
2007 goto Ebusy;
2008 if (a->acdirmin != b->acdirmin)
2009 goto Ebusy;
2010 if (a->acdirmax != b->acdirmax)
2011 goto Ebusy;
2012 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2013 goto Ebusy;
2014 return 1;
2015 Ebusy:
2016 return 0;
2017 }
2018
2019 struct nfs_sb_mountdata {
2020 struct nfs_server *server;
2021 int mntflags;
2022 };
2023
2024 static int nfs_set_super(struct super_block *s, void *data)
2025 {
2026 struct nfs_sb_mountdata *sb_mntdata = data;
2027 struct nfs_server *server = sb_mntdata->server;
2028 int ret;
2029
2030 s->s_flags = sb_mntdata->mntflags;
2031 s->s_fs_info = server;
2032 ret = set_anon_super(s, server);
2033 if (ret == 0)
2034 server->s_dev = s->s_dev;
2035 return ret;
2036 }
2037
2038 static int nfs_compare_super_address(struct nfs_server *server1,
2039 struct nfs_server *server2)
2040 {
2041 struct sockaddr *sap1, *sap2;
2042
2043 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2044 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2045
2046 if (sap1->sa_family != sap2->sa_family)
2047 return 0;
2048
2049 switch (sap1->sa_family) {
2050 case AF_INET: {
2051 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2052 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2053 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2054 return 0;
2055 if (sin1->sin_port != sin2->sin_port)
2056 return 0;
2057 break;
2058 }
2059 case AF_INET6: {
2060 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2061 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2062 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2063 return 0;
2064 if (sin1->sin6_port != sin2->sin6_port)
2065 return 0;
2066 break;
2067 }
2068 default:
2069 return 0;
2070 }
2071
2072 return 1;
2073 }
2074
2075 static int nfs_compare_super(struct super_block *sb, void *data)
2076 {
2077 struct nfs_sb_mountdata *sb_mntdata = data;
2078 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2079 int mntflags = sb_mntdata->mntflags;
2080
2081 if (!nfs_compare_super_address(old, server))
2082 return 0;
2083 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2084 if (old->flags & NFS_MOUNT_UNSHARED)
2085 return 0;
2086 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2087 return 0;
2088 return nfs_compare_mount_options(sb, server, mntflags);
2089 }
2090
2091 static int nfs_bdi_register(struct nfs_server *server)
2092 {
2093 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2094 }
2095
2096 static int nfs_get_sb(struct file_system_type *fs_type,
2097 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2098 {
2099 struct nfs_server *server = NULL;
2100 struct super_block *s;
2101 struct nfs_parsed_mount_data *data;
2102 struct nfs_fh *mntfh;
2103 struct dentry *mntroot;
2104 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2105 struct nfs_sb_mountdata sb_mntdata = {
2106 .mntflags = flags,
2107 };
2108 int error = -ENOMEM;
2109
2110 data = nfs_alloc_parsed_mount_data(3);
2111 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2112 if (data == NULL || mntfh == NULL)
2113 goto out_free_fh;
2114
2115 security_init_mnt_opts(&data->lsm_opts);
2116
2117 /* Validate the mount data */
2118 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2119 if (error < 0)
2120 goto out;
2121
2122 #ifdef CONFIG_NFS_V4
2123 if (data->version == 4) {
2124 error = nfs4_try_mount(flags, dev_name, data, mnt);
2125 kfree(data->client_address);
2126 goto out;
2127 }
2128 #endif /* CONFIG_NFS_V4 */
2129
2130 /* Get a volume representation */
2131 server = nfs_create_server(data, mntfh);
2132 if (IS_ERR(server)) {
2133 error = PTR_ERR(server);
2134 goto out;
2135 }
2136 sb_mntdata.server = server;
2137
2138 if (server->flags & NFS_MOUNT_UNSHARED)
2139 compare_super = NULL;
2140
2141 /* Get a superblock - note that we may end up sharing one that already exists */
2142 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2143 if (IS_ERR(s)) {
2144 error = PTR_ERR(s);
2145 goto out_err_nosb;
2146 }
2147
2148 if (s->s_fs_info != server) {
2149 nfs_free_server(server);
2150 server = NULL;
2151 } else {
2152 error = nfs_bdi_register(server);
2153 if (error)
2154 goto error_splat_super;
2155 }
2156
2157 if (!s->s_root) {
2158 /* initial superblock/root creation */
2159 nfs_fill_super(s, data);
2160 nfs_fscache_get_super_cookie(
2161 s, data ? data->fscache_uniq : NULL, NULL);
2162 }
2163
2164 mntroot = nfs_get_root(s, mntfh);
2165 if (IS_ERR(mntroot)) {
2166 error = PTR_ERR(mntroot);
2167 goto error_splat_super;
2168 }
2169
2170 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2171 if (error)
2172 goto error_splat_root;
2173
2174 s->s_flags |= MS_ACTIVE;
2175 mnt->mnt_sb = s;
2176 mnt->mnt_root = mntroot;
2177 error = 0;
2178
2179 out:
2180 kfree(data->nfs_server.hostname);
2181 kfree(data->mount_server.hostname);
2182 kfree(data->fscache_uniq);
2183 security_free_mnt_opts(&data->lsm_opts);
2184 out_free_fh:
2185 kfree(mntfh);
2186 kfree(data);
2187 return error;
2188
2189 out_err_nosb:
2190 nfs_free_server(server);
2191 goto out;
2192
2193 error_splat_root:
2194 dput(mntroot);
2195 error_splat_super:
2196 deactivate_locked_super(s);
2197 goto out;
2198 }
2199
2200 /*
2201 * Destroy an NFS2/3 superblock
2202 */
2203 static void nfs_kill_super(struct super_block *s)
2204 {
2205 struct nfs_server *server = NFS_SB(s);
2206
2207 kill_anon_super(s);
2208 bdi_unregister(&server->backing_dev_info);
2209 nfs_fscache_release_super_cookie(s);
2210 nfs_free_server(server);
2211 }
2212
2213 /*
2214 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2215 */
2216 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2217 const char *dev_name, void *raw_data,
2218 struct vfsmount *mnt)
2219 {
2220 struct nfs_clone_mount *data = raw_data;
2221 struct super_block *s;
2222 struct nfs_server *server;
2223 struct dentry *mntroot;
2224 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2225 struct nfs_sb_mountdata sb_mntdata = {
2226 .mntflags = flags,
2227 };
2228 int error;
2229
2230 dprintk("--> nfs_xdev_get_sb()\n");
2231
2232 /* create a new volume representation */
2233 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2234 if (IS_ERR(server)) {
2235 error = PTR_ERR(server);
2236 goto out_err_noserver;
2237 }
2238 sb_mntdata.server = server;
2239
2240 if (server->flags & NFS_MOUNT_UNSHARED)
2241 compare_super = NULL;
2242
2243 /* Get a superblock - note that we may end up sharing one that already exists */
2244 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2245 if (IS_ERR(s)) {
2246 error = PTR_ERR(s);
2247 goto out_err_nosb;
2248 }
2249
2250 if (s->s_fs_info != server) {
2251 nfs_free_server(server);
2252 server = NULL;
2253 } else {
2254 error = nfs_bdi_register(server);
2255 if (error)
2256 goto error_splat_super;
2257 }
2258
2259 if (!s->s_root) {
2260 /* initial superblock/root creation */
2261 nfs_clone_super(s, data->sb);
2262 nfs_fscache_get_super_cookie(s, NULL, data);
2263 }
2264
2265 mntroot = nfs_get_root(s, data->fh);
2266 if (IS_ERR(mntroot)) {
2267 error = PTR_ERR(mntroot);
2268 goto error_splat_super;
2269 }
2270 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2271 dput(mntroot);
2272 error = -ESTALE;
2273 goto error_splat_super;
2274 }
2275
2276 s->s_flags |= MS_ACTIVE;
2277 mnt->mnt_sb = s;
2278 mnt->mnt_root = mntroot;
2279
2280 /* clone any lsm security options from the parent to the new sb */
2281 security_sb_clone_mnt_opts(data->sb, s);
2282
2283 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2284 return 0;
2285
2286 out_err_nosb:
2287 nfs_free_server(server);
2288 out_err_noserver:
2289 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2290 return error;
2291
2292 error_splat_super:
2293 deactivate_locked_super(s);
2294 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2295 return error;
2296 }
2297
2298 #ifdef CONFIG_NFS_V4
2299
2300 /*
2301 * Finish setting up a cloned NFS4 superblock
2302 */
2303 static void nfs4_clone_super(struct super_block *sb,
2304 const struct super_block *old_sb)
2305 {
2306 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2307 sb->s_blocksize = old_sb->s_blocksize;
2308 sb->s_maxbytes = old_sb->s_maxbytes;
2309 sb->s_time_gran = 1;
2310 sb->s_op = old_sb->s_op;
2311 nfs_initialise_sb(sb);
2312 }
2313
2314 /*
2315 * Set up an NFS4 superblock
2316 */
2317 static void nfs4_fill_super(struct super_block *sb)
2318 {
2319 sb->s_time_gran = 1;
2320 sb->s_op = &nfs4_sops;
2321 nfs_initialise_sb(sb);
2322 }
2323
2324 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2325 {
2326 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2327 }
2328
2329 static int nfs4_validate_text_mount_data(void *options,
2330 struct nfs_parsed_mount_data *args,
2331 const char *dev_name)
2332 {
2333 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2334
2335 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2336
2337 nfs_validate_transport_protocol(args);
2338
2339 nfs4_validate_mount_flags(args);
2340
2341 if (args->version != 4) {
2342 dfprintk(MOUNT,
2343 "NFS4: Illegal mount version\n");
2344 return -EINVAL;
2345 }
2346
2347 if (args->auth_flavor_len > 1) {
2348 dfprintk(MOUNT,
2349 "NFS4: Too many RPC auth flavours specified\n");
2350 return -EINVAL;
2351 }
2352
2353 if (args->client_address == NULL) {
2354 dfprintk(MOUNT,
2355 "NFS4: mount program didn't pass callback address\n");
2356 return -EINVAL;
2357 }
2358
2359 return nfs_parse_devname(dev_name,
2360 &args->nfs_server.hostname,
2361 NFS4_MAXNAMLEN,
2362 &args->nfs_server.export_path,
2363 NFS4_MAXPATHLEN);
2364 }
2365
2366 /*
2367 * Validate NFSv4 mount options
2368 */
2369 static int nfs4_validate_mount_data(void *options,
2370 struct nfs_parsed_mount_data *args,
2371 const char *dev_name)
2372 {
2373 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2374 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2375 char *c;
2376
2377 if (data == NULL)
2378 goto out_no_data;
2379
2380 switch (data->version) {
2381 case 1:
2382 if (data->host_addrlen > sizeof(args->nfs_server.address))
2383 goto out_no_address;
2384 if (data->host_addrlen == 0)
2385 goto out_no_address;
2386 args->nfs_server.addrlen = data->host_addrlen;
2387 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2388 return -EFAULT;
2389 if (!nfs_verify_server_address(sap))
2390 goto out_no_address;
2391
2392 if (data->auth_flavourlen) {
2393 if (data->auth_flavourlen > 1)
2394 goto out_inval_auth;
2395 if (copy_from_user(&args->auth_flavors[0],
2396 data->auth_flavours,
2397 sizeof(args->auth_flavors[0])))
2398 return -EFAULT;
2399 }
2400
2401 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2402 if (IS_ERR(c))
2403 return PTR_ERR(c);
2404 args->nfs_server.hostname = c;
2405
2406 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2407 if (IS_ERR(c))
2408 return PTR_ERR(c);
2409 args->nfs_server.export_path = c;
2410 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2411
2412 c = strndup_user(data->client_addr.data, 16);
2413 if (IS_ERR(c))
2414 return PTR_ERR(c);
2415 args->client_address = c;
2416
2417 /*
2418 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2419 * can deal with.
2420 */
2421
2422 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2423 args->rsize = data->rsize;
2424 args->wsize = data->wsize;
2425 args->timeo = data->timeo;
2426 args->retrans = data->retrans;
2427 args->acregmin = data->acregmin;
2428 args->acregmax = data->acregmax;
2429 args->acdirmin = data->acdirmin;
2430 args->acdirmax = data->acdirmax;
2431 args->nfs_server.protocol = data->proto;
2432 nfs_validate_transport_protocol(args);
2433
2434 break;
2435 default:
2436 if (nfs_parse_mount_options((char *)options, args) == 0)
2437 return -EINVAL;
2438
2439 if (!nfs_verify_server_address(sap))
2440 return -EINVAL;
2441
2442 return nfs4_validate_text_mount_data(options, args, dev_name);
2443 }
2444
2445 return 0;
2446
2447 out_no_data:
2448 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2449 return -EINVAL;
2450
2451 out_inval_auth:
2452 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2453 data->auth_flavourlen);
2454 return -EINVAL;
2455
2456 out_no_address:
2457 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2458 return -EINVAL;
2459 }
2460
2461 /*
2462 * Get the superblock for the NFS4 root partition
2463 */
2464 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2465 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2466 {
2467 struct nfs_parsed_mount_data *data = raw_data;
2468 struct super_block *s;
2469 struct nfs_server *server;
2470 struct nfs_fh *mntfh;
2471 struct dentry *mntroot;
2472 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2473 struct nfs_sb_mountdata sb_mntdata = {
2474 .mntflags = flags,
2475 };
2476 int error = -ENOMEM;
2477
2478 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2479 if (data == NULL || mntfh == NULL)
2480 goto out_free_fh;
2481
2482 security_init_mnt_opts(&data->lsm_opts);
2483
2484 /* Get a volume representation */
2485 server = nfs4_create_server(data, mntfh);
2486 if (IS_ERR(server)) {
2487 error = PTR_ERR(server);
2488 goto out;
2489 }
2490 sb_mntdata.server = server;
2491
2492 if (server->flags & NFS4_MOUNT_UNSHARED)
2493 compare_super = NULL;
2494
2495 /* Get a superblock - note that we may end up sharing one that already exists */
2496 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2497 if (IS_ERR(s)) {
2498 error = PTR_ERR(s);
2499 goto out_free;
2500 }
2501
2502 if (s->s_fs_info != server) {
2503 nfs_free_server(server);
2504 server = NULL;
2505 } else {
2506 error = nfs_bdi_register(server);
2507 if (error)
2508 goto error_splat_super;
2509 }
2510
2511 if (!s->s_root) {
2512 /* initial superblock/root creation */
2513 nfs4_fill_super(s);
2514 nfs_fscache_get_super_cookie(
2515 s, data ? data->fscache_uniq : NULL, NULL);
2516 }
2517
2518 mntroot = nfs4_get_root(s, mntfh);
2519 if (IS_ERR(mntroot)) {
2520 error = PTR_ERR(mntroot);
2521 goto error_splat_super;
2522 }
2523
2524 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2525 if (error)
2526 goto error_splat_root;
2527
2528 s->s_flags |= MS_ACTIVE;
2529 mnt->mnt_sb = s;
2530 mnt->mnt_root = mntroot;
2531 error = 0;
2532
2533 out:
2534 security_free_mnt_opts(&data->lsm_opts);
2535 out_free_fh:
2536 kfree(mntfh);
2537 return error;
2538
2539 out_free:
2540 nfs_free_server(server);
2541 goto out;
2542
2543 error_splat_root:
2544 dput(mntroot);
2545 error_splat_super:
2546 deactivate_locked_super(s);
2547 goto out;
2548 }
2549
2550 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2551 int flags, void *data, const char *hostname)
2552 {
2553 struct vfsmount *root_mnt;
2554 char *root_devname;
2555 size_t len;
2556
2557 len = strlen(hostname) + 3;
2558 root_devname = kmalloc(len, GFP_KERNEL);
2559 if (root_devname == NULL)
2560 return ERR_PTR(-ENOMEM);
2561 snprintf(root_devname, len, "%s:/", hostname);
2562 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2563 kfree(root_devname);
2564 return root_mnt;
2565 }
2566
2567 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2568 {
2569 char *page = (char *) __get_free_page(GFP_KERNEL);
2570 char *devname, *tmp;
2571
2572 if (page == NULL)
2573 return;
2574 devname = nfs_path(path->mnt->mnt_devname,
2575 path->mnt->mnt_root, path->dentry,
2576 page, PAGE_SIZE);
2577 if (devname == NULL)
2578 goto out_freepage;
2579 tmp = kstrdup(devname, GFP_KERNEL);
2580 if (tmp == NULL)
2581 goto out_freepage;
2582 kfree(mnt->mnt_devname);
2583 mnt->mnt_devname = tmp;
2584 out_freepage:
2585 free_page((unsigned long)page);
2586 }
2587
2588 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2589 const char *export_path, struct vfsmount *mnt_target)
2590 {
2591 struct mnt_namespace *ns_private;
2592 struct nameidata nd;
2593 struct super_block *s;
2594 int ret;
2595
2596 ns_private = create_mnt_ns(root_mnt);
2597 ret = PTR_ERR(ns_private);
2598 if (IS_ERR(ns_private))
2599 goto out_mntput;
2600
2601 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2602 export_path, LOOKUP_FOLLOW, &nd);
2603
2604 put_mnt_ns(ns_private);
2605
2606 if (ret != 0)
2607 goto out_err;
2608
2609 s = nd.path.mnt->mnt_sb;
2610 atomic_inc(&s->s_active);
2611 mnt_target->mnt_sb = s;
2612 mnt_target->mnt_root = dget(nd.path.dentry);
2613
2614 /* Correct the device pathname */
2615 nfs_fix_devname(&nd.path, mnt_target);
2616
2617 path_put(&nd.path);
2618 down_write(&s->s_umount);
2619 return 0;
2620 out_mntput:
2621 mntput(root_mnt);
2622 out_err:
2623 return ret;
2624 }
2625
2626 static int nfs4_try_mount(int flags, const char *dev_name,
2627 struct nfs_parsed_mount_data *data,
2628 struct vfsmount *mnt)
2629 {
2630 char *export_path;
2631 struct vfsmount *root_mnt;
2632 int error;
2633
2634 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2635
2636 export_path = data->nfs_server.export_path;
2637 data->nfs_server.export_path = "/";
2638 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2639 data->nfs_server.hostname);
2640 data->nfs_server.export_path = export_path;
2641
2642 error = PTR_ERR(root_mnt);
2643 if (IS_ERR(root_mnt))
2644 goto out;
2645
2646 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2647
2648 out:
2649 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2650 error != 0 ? " [error]" : "");
2651 return error;
2652 }
2653
2654 /*
2655 * Get the superblock for an NFS4 mountpoint
2656 */
2657 static int nfs4_get_sb(struct file_system_type *fs_type,
2658 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2659 {
2660 struct nfs_parsed_mount_data *data;
2661 int error = -ENOMEM;
2662
2663 data = nfs_alloc_parsed_mount_data(4);
2664 if (data == NULL)
2665 goto out_free_data;
2666
2667 /* Validate the mount data */
2668 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2669 if (error < 0)
2670 goto out;
2671
2672 error = nfs4_try_mount(flags, dev_name, data, mnt);
2673
2674 out:
2675 kfree(data->client_address);
2676 kfree(data->nfs_server.export_path);
2677 kfree(data->nfs_server.hostname);
2678 kfree(data->fscache_uniq);
2679 out_free_data:
2680 kfree(data);
2681 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2682 error != 0 ? " [error]" : "");
2683 return error;
2684 }
2685
2686 static void nfs4_kill_super(struct super_block *sb)
2687 {
2688 struct nfs_server *server = NFS_SB(sb);
2689
2690 dprintk("--> %s\n", __func__);
2691 nfs_super_return_all_delegations(sb);
2692 kill_anon_super(sb);
2693 nfs_fscache_release_super_cookie(sb);
2694 nfs_free_server(server);
2695 dprintk("<-- %s\n", __func__);
2696 }
2697
2698 /*
2699 * Clone an NFS4 server record on xdev traversal (FSID-change)
2700 */
2701 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2702 const char *dev_name, void *raw_data,
2703 struct vfsmount *mnt)
2704 {
2705 struct nfs_clone_mount *data = raw_data;
2706 struct super_block *s;
2707 struct nfs_server *server;
2708 struct dentry *mntroot;
2709 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2710 struct nfs_sb_mountdata sb_mntdata = {
2711 .mntflags = flags,
2712 };
2713 int error;
2714
2715 dprintk("--> nfs4_xdev_get_sb()\n");
2716
2717 /* create a new volume representation */
2718 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2719 if (IS_ERR(server)) {
2720 error = PTR_ERR(server);
2721 goto out_err_noserver;
2722 }
2723 sb_mntdata.server = server;
2724
2725 if (server->flags & NFS4_MOUNT_UNSHARED)
2726 compare_super = NULL;
2727
2728 /* Get a superblock - note that we may end up sharing one that already exists */
2729 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2730 if (IS_ERR(s)) {
2731 error = PTR_ERR(s);
2732 goto out_err_nosb;
2733 }
2734
2735 if (s->s_fs_info != server) {
2736 nfs_free_server(server);
2737 server = NULL;
2738 } else {
2739 error = nfs_bdi_register(server);
2740 if (error)
2741 goto error_splat_super;
2742 }
2743
2744 if (!s->s_root) {
2745 /* initial superblock/root creation */
2746 nfs4_clone_super(s, data->sb);
2747 nfs_fscache_get_super_cookie(s, NULL, data);
2748 }
2749
2750 mntroot = nfs4_get_root(s, data->fh);
2751 if (IS_ERR(mntroot)) {
2752 error = PTR_ERR(mntroot);
2753 goto error_splat_super;
2754 }
2755 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2756 dput(mntroot);
2757 error = -ESTALE;
2758 goto error_splat_super;
2759 }
2760
2761 s->s_flags |= MS_ACTIVE;
2762 mnt->mnt_sb = s;
2763 mnt->mnt_root = mntroot;
2764
2765 security_sb_clone_mnt_opts(data->sb, s);
2766
2767 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2768 return 0;
2769
2770 out_err_nosb:
2771 nfs_free_server(server);
2772 out_err_noserver:
2773 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2774 return error;
2775
2776 error_splat_super:
2777 deactivate_locked_super(s);
2778 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2779 return error;
2780 }
2781
2782 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2783 int flags, const char *dev_name, void *raw_data,
2784 struct vfsmount *mnt)
2785 {
2786 struct nfs_clone_mount *data = raw_data;
2787 struct super_block *s;
2788 struct nfs_server *server;
2789 struct dentry *mntroot;
2790 struct nfs_fh mntfh;
2791 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2792 struct nfs_sb_mountdata sb_mntdata = {
2793 .mntflags = flags,
2794 };
2795 int error;
2796
2797 dprintk("--> nfs4_referral_get_sb()\n");
2798
2799 /* create a new volume representation */
2800 server = nfs4_create_referral_server(data, &mntfh);
2801 if (IS_ERR(server)) {
2802 error = PTR_ERR(server);
2803 goto out_err_noserver;
2804 }
2805 sb_mntdata.server = server;
2806
2807 if (server->flags & NFS4_MOUNT_UNSHARED)
2808 compare_super = NULL;
2809
2810 /* Get a superblock - note that we may end up sharing one that already exists */
2811 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2812 if (IS_ERR(s)) {
2813 error = PTR_ERR(s);
2814 goto out_err_nosb;
2815 }
2816
2817 if (s->s_fs_info != server) {
2818 nfs_free_server(server);
2819 server = NULL;
2820 } else {
2821 error = nfs_bdi_register(server);
2822 if (error)
2823 goto error_splat_super;
2824 }
2825
2826 if (!s->s_root) {
2827 /* initial superblock/root creation */
2828 nfs4_fill_super(s);
2829 nfs_fscache_get_super_cookie(s, NULL, data);
2830 }
2831
2832 mntroot = nfs4_get_root(s, &mntfh);
2833 if (IS_ERR(mntroot)) {
2834 error = PTR_ERR(mntroot);
2835 goto error_splat_super;
2836 }
2837 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2838 dput(mntroot);
2839 error = -ESTALE;
2840 goto error_splat_super;
2841 }
2842
2843 s->s_flags |= MS_ACTIVE;
2844 mnt->mnt_sb = s;
2845 mnt->mnt_root = mntroot;
2846
2847 security_sb_clone_mnt_opts(data->sb, s);
2848
2849 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2850 return 0;
2851
2852 out_err_nosb:
2853 nfs_free_server(server);
2854 out_err_noserver:
2855 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2856 return error;
2857
2858 error_splat_super:
2859 deactivate_locked_super(s);
2860 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2861 return error;
2862 }
2863
2864 /*
2865 * Create an NFS4 server record on referral traversal
2866 */
2867 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2868 int flags, const char *dev_name, void *raw_data,
2869 struct vfsmount *mnt)
2870 {
2871 struct nfs_clone_mount *data = raw_data;
2872 char *export_path;
2873 struct vfsmount *root_mnt;
2874 int error;
2875
2876 dprintk("--> nfs4_referral_get_sb()\n");
2877
2878 export_path = data->mnt_path;
2879 data->mnt_path = "/";
2880
2881 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2882 flags, data, data->hostname);
2883 data->mnt_path = export_path;
2884
2885 error = PTR_ERR(root_mnt);
2886 if (IS_ERR(root_mnt))
2887 goto out;
2888
2889 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2890 out:
2891 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2892 error != 0 ? " [error]" : "");
2893 return error;
2894 }
2895
2896 #endif /* CONFIG_NFS_V4 */
Linux with added FPC-III support