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NFS: Reduce the NFS mount code stack usage.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / super.c
blobdac663dc56114a22ad68e60b6264beb0d59f92b7
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.Cox@linux.org>, 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/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <net/ipv6.h>
50 #include <linux/nfs_xdr.h>
51 #include <linux/magic.h>
52 #include <linux/parser.h>
53
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
56
57 #include "nfs4_fs.h"
58 #include "callback.h"
59 #include "delegation.h"
60 #include "iostat.h"
61 #include "internal.h"
62
63 #define NFSDBG_FACILITY NFSDBG_VFS
64
65 enum {
66 /* Mount options that take no arguments */
67 Opt_soft, Opt_hard,
68 Opt_intr, Opt_nointr,
69 Opt_posix, Opt_noposix,
70 Opt_cto, Opt_nocto,
71 Opt_ac, Opt_noac,
72 Opt_lock, Opt_nolock,
73 Opt_v2, Opt_v3,
74 Opt_udp, Opt_tcp, Opt_rdma,
75 Opt_acl, Opt_noacl,
76 Opt_rdirplus, Opt_nordirplus,
77 Opt_sharecache, Opt_nosharecache,
78
79 /* Mount options that take integer arguments */
80 Opt_port,
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
85 Opt_actimeo,
86 Opt_namelen,
87 Opt_mountport,
88 Opt_mountvers,
89 Opt_nfsvers,
90
91 /* Mount options that take string arguments */
92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
93 Opt_addr, Opt_mountaddr, Opt_clientaddr,
94
95 /* Mount options that are ignored */
96 Opt_userspace, Opt_deprecated,
97
98 Opt_err
99 };
100
101 static match_table_t nfs_mount_option_tokens = {
102 { Opt_userspace, "bg" },
103 { Opt_userspace, "fg" },
104 { Opt_soft, "soft" },
105 { Opt_hard, "hard" },
106 { Opt_intr, "intr" },
107 { Opt_nointr, "nointr" },
108 { Opt_posix, "posix" },
109 { Opt_noposix, "noposix" },
110 { Opt_cto, "cto" },
111 { Opt_nocto, "nocto" },
112 { Opt_ac, "ac" },
113 { Opt_noac, "noac" },
114 { Opt_lock, "lock" },
115 { Opt_nolock, "nolock" },
116 { Opt_v2, "v2" },
117 { Opt_v3, "v3" },
118 { Opt_udp, "udp" },
119 { Opt_tcp, "tcp" },
120 { Opt_rdma, "rdma" },
121 { Opt_acl, "acl" },
122 { Opt_noacl, "noacl" },
123 { Opt_rdirplus, "rdirplus" },
124 { Opt_nordirplus, "nordirplus" },
125 { Opt_sharecache, "sharecache" },
126 { Opt_nosharecache, "nosharecache" },
127
128 { Opt_port, "port=%u" },
129 { Opt_rsize, "rsize=%u" },
130 { Opt_wsize, "wsize=%u" },
131 { Opt_bsize, "bsize=%u" },
132 { Opt_timeo, "timeo=%u" },
133 { Opt_retrans, "retrans=%u" },
134 { Opt_acregmin, "acregmin=%u" },
135 { Opt_acregmax, "acregmax=%u" },
136 { Opt_acdirmin, "acdirmin=%u" },
137 { Opt_acdirmax, "acdirmax=%u" },
138 { Opt_actimeo, "actimeo=%u" },
139 { Opt_userspace, "retry=%u" },
140 { Opt_namelen, "namlen=%u" },
141 { Opt_mountport, "mountport=%u" },
142 { Opt_mountvers, "mountvers=%u" },
143 { Opt_nfsvers, "nfsvers=%u" },
144 { Opt_nfsvers, "vers=%u" },
145
146 { Opt_sec, "sec=%s" },
147 { Opt_proto, "proto=%s" },
148 { Opt_mountproto, "mountproto=%s" },
149 { Opt_addr, "addr=%s" },
150 { Opt_clientaddr, "clientaddr=%s" },
151 { Opt_mounthost, "mounthost=%s" },
152 { Opt_mountaddr, "mountaddr=%s" },
153
154 { Opt_err, NULL }
155 };
156
157 enum {
158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
159
160 Opt_xprt_err
161 };
162
163 static match_table_t nfs_xprt_protocol_tokens = {
164 { Opt_xprt_udp, "udp" },
165 { Opt_xprt_tcp, "tcp" },
166 { Opt_xprt_rdma, "rdma" },
167
168 { Opt_xprt_err, NULL }
169 };
170
171 enum {
172 Opt_sec_none, Opt_sec_sys,
173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
176
177 Opt_sec_err
178 };
179
180 static match_table_t nfs_secflavor_tokens = {
181 { Opt_sec_none, "none" },
182 { Opt_sec_none, "null" },
183 { Opt_sec_sys, "sys" },
184
185 { Opt_sec_krb5, "krb5" },
186 { Opt_sec_krb5i, "krb5i" },
187 { Opt_sec_krb5p, "krb5p" },
188
189 { Opt_sec_lkey, "lkey" },
190 { Opt_sec_lkeyi, "lkeyi" },
191 { Opt_sec_lkeyp, "lkeyp" },
192
193 { Opt_sec_spkm, "spkm3" },
194 { Opt_sec_spkmi, "spkm3i" },
195 { Opt_sec_spkmp, "spkm3p" },
196
197 { Opt_sec_err, NULL }
198 };
199
200
201 static void nfs_umount_begin(struct super_block *);
202 static int nfs_statfs(struct dentry *, struct kstatfs *);
203 static int nfs_show_options(struct seq_file *, struct vfsmount *);
204 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
205 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
206 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
207 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
208 static void nfs_kill_super(struct super_block *);
209 static void nfs_put_super(struct super_block *);
210
211 static struct file_system_type nfs_fs_type = {
212 .owner = THIS_MODULE,
213 .name = "nfs",
214 .get_sb = nfs_get_sb,
215 .kill_sb = nfs_kill_super,
216 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
217 };
218
219 struct file_system_type nfs_xdev_fs_type = {
220 .owner = THIS_MODULE,
221 .name = "nfs",
222 .get_sb = nfs_xdev_get_sb,
223 .kill_sb = nfs_kill_super,
224 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
225 };
226
227 static const struct super_operations nfs_sops = {
228 .alloc_inode = nfs_alloc_inode,
229 .destroy_inode = nfs_destroy_inode,
230 .write_inode = nfs_write_inode,
231 .put_super = nfs_put_super,
232 .statfs = nfs_statfs,
233 .clear_inode = nfs_clear_inode,
234 .umount_begin = nfs_umount_begin,
235 .show_options = nfs_show_options,
236 .show_stats = nfs_show_stats,
237 };
238
239 #ifdef CONFIG_NFS_V4
240 static int nfs4_get_sb(struct file_system_type *fs_type,
241 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
242 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
246 static void nfs4_kill_super(struct super_block *sb);
247
248 static struct file_system_type nfs4_fs_type = {
249 .owner = THIS_MODULE,
250 .name = "nfs4",
251 .get_sb = nfs4_get_sb,
252 .kill_sb = nfs4_kill_super,
253 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
254 };
255
256 struct file_system_type nfs4_xdev_fs_type = {
257 .owner = THIS_MODULE,
258 .name = "nfs4",
259 .get_sb = nfs4_xdev_get_sb,
260 .kill_sb = nfs4_kill_super,
261 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
262 };
263
264 struct file_system_type nfs4_referral_fs_type = {
265 .owner = THIS_MODULE,
266 .name = "nfs4",
267 .get_sb = nfs4_referral_get_sb,
268 .kill_sb = nfs4_kill_super,
269 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
270 };
271
272 static const struct super_operations nfs4_sops = {
273 .alloc_inode = nfs_alloc_inode,
274 .destroy_inode = nfs_destroy_inode,
275 .write_inode = nfs_write_inode,
276 .statfs = nfs_statfs,
277 .clear_inode = nfs4_clear_inode,
278 .umount_begin = nfs_umount_begin,
279 .show_options = nfs_show_options,
280 .show_stats = nfs_show_stats,
281 };
282 #endif
283
284 static struct shrinker acl_shrinker = {
285 .shrink = nfs_access_cache_shrinker,
286 .seeks = DEFAULT_SEEKS,
287 };
288
289 /*
290 * Register the NFS filesystems
291 */
292 int __init register_nfs_fs(void)
293 {
294 int ret;
295
296 ret = register_filesystem(&nfs_fs_type);
297 if (ret < 0)
298 goto error_0;
299
300 ret = nfs_register_sysctl();
301 if (ret < 0)
302 goto error_1;
303 #ifdef CONFIG_NFS_V4
304 ret = register_filesystem(&nfs4_fs_type);
305 if (ret < 0)
306 goto error_2;
307 #endif
308 register_shrinker(&acl_shrinker);
309 return 0;
310
311 #ifdef CONFIG_NFS_V4
312 error_2:
313 nfs_unregister_sysctl();
314 #endif
315 error_1:
316 unregister_filesystem(&nfs_fs_type);
317 error_0:
318 return ret;
319 }
320
321 /*
322 * Unregister the NFS filesystems
323 */
324 void __exit unregister_nfs_fs(void)
325 {
326 unregister_shrinker(&acl_shrinker);
327 #ifdef CONFIG_NFS_V4
328 unregister_filesystem(&nfs4_fs_type);
329 #endif
330 nfs_unregister_sysctl();
331 unregister_filesystem(&nfs_fs_type);
332 }
333
334 void nfs_sb_active(struct nfs_server *server)
335 {
336 atomic_inc(&server->active);
337 }
338
339 void nfs_sb_deactive(struct nfs_server *server)
340 {
341 if (atomic_dec_and_test(&server->active))
342 wake_up(&server->active_wq);
343 }
344
345 static void nfs_put_super(struct super_block *sb)
346 {
347 struct nfs_server *server = NFS_SB(sb);
348 /*
349 * Make sure there are no outstanding ops to this server.
350 * If so, wait for them to finish before allowing the
351 * unmount to continue.
352 */
353 wait_event(server->active_wq, atomic_read(&server->active) == 0);
354 }
355
356 /*
357 * Deliver file system statistics to userspace
358 */
359 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
360 {
361 struct nfs_server *server = NFS_SB(dentry->d_sb);
362 unsigned char blockbits;
363 unsigned long blockres;
364 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
365 struct nfs_fattr fattr;
366 struct nfs_fsstat res = {
367 .fattr = &fattr,
368 };
369 int error;
370
371 lock_kernel();
372
373 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
374 if (error < 0)
375 goto out_err;
376 buf->f_type = NFS_SUPER_MAGIC;
377
378 /*
379 * Current versions of glibc do not correctly handle the
380 * case where f_frsize != f_bsize. Eventually we want to
381 * report the value of wtmult in this field.
382 */
383 buf->f_frsize = dentry->d_sb->s_blocksize;
384
385 /*
386 * On most *nix systems, f_blocks, f_bfree, and f_bavail
387 * are reported in units of f_frsize. Linux hasn't had
388 * an f_frsize field in its statfs struct until recently,
389 * thus historically Linux's sys_statfs reports these
390 * fields in units of f_bsize.
391 */
392 buf->f_bsize = dentry->d_sb->s_blocksize;
393 blockbits = dentry->d_sb->s_blocksize_bits;
394 blockres = (1 << blockbits) - 1;
395 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
396 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
397 buf->f_bavail = (res.abytes + blockres) >> blockbits;
398
399 buf->f_files = res.tfiles;
400 buf->f_ffree = res.afiles;
401
402 buf->f_namelen = server->namelen;
403
404 unlock_kernel();
405 return 0;
406
407 out_err:
408 dprintk("%s: statfs error = %d\n", __func__, -error);
409 unlock_kernel();
410 return error;
411 }
412
413 /*
414 * Map the security flavour number to a name
415 */
416 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
417 {
418 static const struct {
419 rpc_authflavor_t flavour;
420 const char *str;
421 } sec_flavours[] = {
422 { RPC_AUTH_NULL, "null" },
423 { RPC_AUTH_UNIX, "sys" },
424 { RPC_AUTH_GSS_KRB5, "krb5" },
425 { RPC_AUTH_GSS_KRB5I, "krb5i" },
426 { RPC_AUTH_GSS_KRB5P, "krb5p" },
427 { RPC_AUTH_GSS_LKEY, "lkey" },
428 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
429 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
430 { RPC_AUTH_GSS_SPKM, "spkm" },
431 { RPC_AUTH_GSS_SPKMI, "spkmi" },
432 { RPC_AUTH_GSS_SPKMP, "spkmp" },
433 { UINT_MAX, "unknown" }
434 };
435 int i;
436
437 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
438 if (sec_flavours[i].flavour == flavour)
439 break;
440 }
441 return sec_flavours[i].str;
442 }
443
444 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
445 int showdefaults)
446 {
447 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
448
449 switch (sap->sa_family) {
450 case AF_INET: {
451 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
452 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
453 NIPQUAD(sin->sin_addr.s_addr));
454 break;
455 }
456 case AF_INET6: {
457 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
458 seq_printf(m, ",mountaddr=" NIP6_FMT,
459 NIP6(sin6->sin6_addr));
460 break;
461 }
462 default:
463 if (showdefaults)
464 seq_printf(m, ",mountaddr=unspecified");
465 }
466
467 if (nfss->mountd_version || showdefaults)
468 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
469 if (nfss->mountd_port || showdefaults)
470 seq_printf(m, ",mountport=%u", nfss->mountd_port);
471
472 switch (nfss->mountd_protocol) {
473 case IPPROTO_UDP:
474 seq_printf(m, ",mountproto=udp");
475 break;
476 case IPPROTO_TCP:
477 seq_printf(m, ",mountproto=tcp");
478 break;
479 default:
480 if (showdefaults)
481 seq_printf(m, ",mountproto=auto");
482 }
483 }
484
485 /*
486 * Describe the mount options in force on this server representation
487 */
488 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
489 int showdefaults)
490 {
491 static const struct proc_nfs_info {
492 int flag;
493 const char *str;
494 const char *nostr;
495 } nfs_info[] = {
496 { NFS_MOUNT_SOFT, ",soft", ",hard" },
497 { NFS_MOUNT_INTR, ",intr", ",nointr" },
498 { NFS_MOUNT_POSIX, ",posix", "" },
499 { NFS_MOUNT_NOCTO, ",nocto", "" },
500 { NFS_MOUNT_NOAC, ",noac", "" },
501 { NFS_MOUNT_NONLM, ",nolock", "" },
502 { NFS_MOUNT_NOACL, ",noacl", "" },
503 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
504 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
505 { 0, NULL, NULL }
506 };
507 const struct proc_nfs_info *nfs_infop;
508 struct nfs_client *clp = nfss->nfs_client;
509 u32 version = clp->rpc_ops->version;
510
511 seq_printf(m, ",vers=%u", version);
512 seq_printf(m, ",rsize=%u", nfss->rsize);
513 seq_printf(m, ",wsize=%u", nfss->wsize);
514 if (nfss->bsize != 0)
515 seq_printf(m, ",bsize=%u", nfss->bsize);
516 seq_printf(m, ",namlen=%u", nfss->namelen);
517 if (nfss->acregmin != 3*HZ || showdefaults)
518 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
519 if (nfss->acregmax != 60*HZ || showdefaults)
520 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
521 if (nfss->acdirmin != 30*HZ || showdefaults)
522 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
523 if (nfss->acdirmax != 60*HZ || showdefaults)
524 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
525 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
526 if (nfss->flags & nfs_infop->flag)
527 seq_puts(m, nfs_infop->str);
528 else
529 seq_puts(m, nfs_infop->nostr);
530 }
531 seq_printf(m, ",proto=%s",
532 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
533 if (version == 4) {
534 if (nfss->port != NFS_PORT)
535 seq_printf(m, ",port=%u", nfss->port);
536 } else
537 if (nfss->port)
538 seq_printf(m, ",port=%u", nfss->port);
539
540 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
541 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
542 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
543
544 if (version != 4)
545 nfs_show_mountd_options(m, nfss, showdefaults);
546
547 #ifdef CONFIG_NFS_V4
548 if (clp->rpc_ops->version == 4)
549 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
550 #endif
551 }
552
553 /*
554 * Describe the mount options on this VFS mountpoint
555 */
556 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
557 {
558 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
559
560 nfs_show_mount_options(m, nfss, 0);
561
562 seq_printf(m, ",addr=%s",
563 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
564 RPC_DISPLAY_ADDR));
565
566 return 0;
567 }
568
569 /*
570 * Present statistical information for this VFS mountpoint
571 */
572 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
573 {
574 int i, cpu;
575 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
576 struct rpc_auth *auth = nfss->client->cl_auth;
577 struct nfs_iostats totals = { };
578
579 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
580
581 /*
582 * Display all mount option settings
583 */
584 seq_printf(m, "\n\topts:\t");
585 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
586 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
587 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
588 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
589 nfs_show_mount_options(m, nfss, 1);
590
591 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
592
593 seq_printf(m, "\n\tcaps:\t");
594 seq_printf(m, "caps=0x%x", nfss->caps);
595 seq_printf(m, ",wtmult=%u", nfss->wtmult);
596 seq_printf(m, ",dtsize=%u", nfss->dtsize);
597 seq_printf(m, ",bsize=%u", nfss->bsize);
598 seq_printf(m, ",namlen=%u", nfss->namelen);
599
600 #ifdef CONFIG_NFS_V4
601 if (nfss->nfs_client->rpc_ops->version == 4) {
602 seq_printf(m, "\n\tnfsv4:\t");
603 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
604 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
605 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
606 }
607 #endif
608
609 /*
610 * Display security flavor in effect for this mount
611 */
612 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
613 if (auth->au_flavor)
614 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
615
616 /*
617 * Display superblock I/O counters
618 */
619 for_each_possible_cpu(cpu) {
620 struct nfs_iostats *stats;
621
622 preempt_disable();
623 stats = per_cpu_ptr(nfss->io_stats, cpu);
624
625 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
626 totals.events[i] += stats->events[i];
627 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
628 totals.bytes[i] += stats->bytes[i];
629
630 preempt_enable();
631 }
632
633 seq_printf(m, "\n\tevents:\t");
634 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
635 seq_printf(m, "%lu ", totals.events[i]);
636 seq_printf(m, "\n\tbytes:\t");
637 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
638 seq_printf(m, "%Lu ", totals.bytes[i]);
639 seq_printf(m, "\n");
640
641 rpc_print_iostats(m, nfss->client);
642
643 return 0;
644 }
645
646 /*
647 * Begin unmount by attempting to remove all automounted mountpoints we added
648 * in response to xdev traversals and referrals
649 */
650 static void nfs_umount_begin(struct super_block *sb)
651 {
652 struct nfs_server *server = NFS_SB(sb);
653 struct rpc_clnt *rpc;
654
655 /* -EIO all pending I/O */
656 rpc = server->client_acl;
657 if (!IS_ERR(rpc))
658 rpc_killall_tasks(rpc);
659 rpc = server->client;
660 if (!IS_ERR(rpc))
661 rpc_killall_tasks(rpc);
662 }
663
664 /*
665 * Set the port number in an address. Be agnostic about the address family.
666 */
667 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
668 {
669 switch (sap->sa_family) {
670 case AF_INET: {
671 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
672 ap->sin_port = htons(port);
673 break;
674 }
675 case AF_INET6: {
676 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
677 ap->sin6_port = htons(port);
678 break;
679 }
680 }
681 }
682
683 /*
684 * Sanity-check a server address provided by the mount command.
685 *
686 * Address family must be initialized, and address must not be
687 * the ANY address for that family.
688 */
689 static int nfs_verify_server_address(struct sockaddr *addr)
690 {
691 switch (addr->sa_family) {
692 case AF_INET: {
693 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
694 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
695 }
696 case AF_INET6: {
697 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
698 return !ipv6_addr_any(sa);
699 }
700 }
701
702 return 0;
703 }
704
705 /*
706 * Parse string addresses passed in via a mount option,
707 * and construct a sockaddr based on the result.
708 *
709 * If address parsing fails, set the sockaddr's address
710 * family to AF_UNSPEC to force nfs_verify_server_address()
711 * to punt the mount.
712 */
713 static void nfs_parse_server_address(char *value,
714 struct sockaddr *sap,
715 size_t *len)
716 {
717 if (strchr(value, ':')) {
718 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
719 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
720
721 ap->sin6_family = AF_INET6;
722 *len = sizeof(*ap);
723 if (in6_pton(value, -1, addr, '\0', NULL))
724 return;
725 } else {
726 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
727 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
728
729 ap->sin_family = AF_INET;
730 *len = sizeof(*ap);
731 if (in4_pton(value, -1, addr, '\0', NULL))
732 return;
733 }
734
735 sap->sa_family = AF_UNSPEC;
736 *len = 0;
737 }
738
739 /*
740 * Error-check and convert a string of mount options from user space into
741 * a data structure
742 */
743 static int nfs_parse_mount_options(char *raw,
744 struct nfs_parsed_mount_data *mnt)
745 {
746 char *p, *string, *secdata;
747 int rc;
748
749 if (!raw) {
750 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
751 return 1;
752 }
753 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
754
755 secdata = alloc_secdata();
756 if (!secdata)
757 goto out_nomem;
758
759 rc = security_sb_copy_data(raw, secdata);
760 if (rc)
761 goto out_security_failure;
762
763 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
764 if (rc)
765 goto out_security_failure;
766
767 free_secdata(secdata);
768
769 while ((p = strsep(&raw, ",")) != NULL) {
770 substring_t args[MAX_OPT_ARGS];
771 int option, token;
772
773 if (!*p)
774 continue;
775
776 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
777
778 token = match_token(p, nfs_mount_option_tokens, args);
779 switch (token) {
780 case Opt_soft:
781 mnt->flags |= NFS_MOUNT_SOFT;
782 break;
783 case Opt_hard:
784 mnt->flags &= ~NFS_MOUNT_SOFT;
785 break;
786 case Opt_intr:
787 case Opt_nointr:
788 break;
789 case Opt_posix:
790 mnt->flags |= NFS_MOUNT_POSIX;
791 break;
792 case Opt_noposix:
793 mnt->flags &= ~NFS_MOUNT_POSIX;
794 break;
795 case Opt_cto:
796 mnt->flags &= ~NFS_MOUNT_NOCTO;
797 break;
798 case Opt_nocto:
799 mnt->flags |= NFS_MOUNT_NOCTO;
800 break;
801 case Opt_ac:
802 mnt->flags &= ~NFS_MOUNT_NOAC;
803 break;
804 case Opt_noac:
805 mnt->flags |= NFS_MOUNT_NOAC;
806 break;
807 case Opt_lock:
808 mnt->flags &= ~NFS_MOUNT_NONLM;
809 break;
810 case Opt_nolock:
811 mnt->flags |= NFS_MOUNT_NONLM;
812 break;
813 case Opt_v2:
814 mnt->flags &= ~NFS_MOUNT_VER3;
815 break;
816 case Opt_v3:
817 mnt->flags |= NFS_MOUNT_VER3;
818 break;
819 case Opt_udp:
820 mnt->flags &= ~NFS_MOUNT_TCP;
821 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
822 mnt->timeo = 7;
823 mnt->retrans = 5;
824 break;
825 case Opt_tcp:
826 mnt->flags |= NFS_MOUNT_TCP;
827 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
828 mnt->timeo = 600;
829 mnt->retrans = 2;
830 break;
831 case Opt_rdma:
832 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
833 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
834 mnt->timeo = 600;
835 mnt->retrans = 2;
836 break;
837 case Opt_acl:
838 mnt->flags &= ~NFS_MOUNT_NOACL;
839 break;
840 case Opt_noacl:
841 mnt->flags |= NFS_MOUNT_NOACL;
842 break;
843 case Opt_rdirplus:
844 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
845 break;
846 case Opt_nordirplus:
847 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
848 break;
849 case Opt_sharecache:
850 mnt->flags &= ~NFS_MOUNT_UNSHARED;
851 break;
852 case Opt_nosharecache:
853 mnt->flags |= NFS_MOUNT_UNSHARED;
854 break;
855
856 case Opt_port:
857 if (match_int(args, &option))
858 return 0;
859 if (option < 0 || option > 65535)
860 return 0;
861 mnt->nfs_server.port = option;
862 break;
863 case Opt_rsize:
864 if (match_int(args, &mnt->rsize))
865 return 0;
866 break;
867 case Opt_wsize:
868 if (match_int(args, &mnt->wsize))
869 return 0;
870 break;
871 case Opt_bsize:
872 if (match_int(args, &option))
873 return 0;
874 if (option < 0)
875 return 0;
876 mnt->bsize = option;
877 break;
878 case Opt_timeo:
879 if (match_int(args, &mnt->timeo))
880 return 0;
881 break;
882 case Opt_retrans:
883 if (match_int(args, &mnt->retrans))
884 return 0;
885 break;
886 case Opt_acregmin:
887 if (match_int(args, &mnt->acregmin))
888 return 0;
889 break;
890 case Opt_acregmax:
891 if (match_int(args, &mnt->acregmax))
892 return 0;
893 break;
894 case Opt_acdirmin:
895 if (match_int(args, &mnt->acdirmin))
896 return 0;
897 break;
898 case Opt_acdirmax:
899 if (match_int(args, &mnt->acdirmax))
900 return 0;
901 break;
902 case Opt_actimeo:
903 if (match_int(args, &option))
904 return 0;
905 if (option < 0)
906 return 0;
907 mnt->acregmin =
908 mnt->acregmax =
909 mnt->acdirmin =
910 mnt->acdirmax = option;
911 break;
912 case Opt_namelen:
913 if (match_int(args, &mnt->namlen))
914 return 0;
915 break;
916 case Opt_mountport:
917 if (match_int(args, &option))
918 return 0;
919 if (option < 0 || option > 65535)
920 return 0;
921 mnt->mount_server.port = option;
922 break;
923 case Opt_mountvers:
924 if (match_int(args, &option))
925 return 0;
926 if (option < 0)
927 return 0;
928 mnt->mount_server.version = option;
929 break;
930 case Opt_nfsvers:
931 if (match_int(args, &option))
932 return 0;
933 switch (option) {
934 case 2:
935 mnt->flags &= ~NFS_MOUNT_VER3;
936 break;
937 case 3:
938 mnt->flags |= NFS_MOUNT_VER3;
939 break;
940 default:
941 goto out_unrec_vers;
942 }
943 break;
944
945 case Opt_sec:
946 string = match_strdup(args);
947 if (string == NULL)
948 goto out_nomem;
949 token = match_token(string, nfs_secflavor_tokens, args);
950 kfree(string);
951
952 /*
953 * The flags setting is for v2/v3. The flavor_len
954 * setting is for v4. v2/v3 also need to know the
955 * difference between NULL and UNIX.
956 */
957 switch (token) {
958 case Opt_sec_none:
959 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
960 mnt->auth_flavor_len = 0;
961 mnt->auth_flavors[0] = RPC_AUTH_NULL;
962 break;
963 case Opt_sec_sys:
964 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
965 mnt->auth_flavor_len = 0;
966 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
967 break;
968 case Opt_sec_krb5:
969 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
970 mnt->auth_flavor_len = 1;
971 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
972 break;
973 case Opt_sec_krb5i:
974 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
975 mnt->auth_flavor_len = 1;
976 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
977 break;
978 case Opt_sec_krb5p:
979 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
980 mnt->auth_flavor_len = 1;
981 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
982 break;
983 case Opt_sec_lkey:
984 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
985 mnt->auth_flavor_len = 1;
986 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
987 break;
988 case Opt_sec_lkeyi:
989 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
990 mnt->auth_flavor_len = 1;
991 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
992 break;
993 case Opt_sec_lkeyp:
994 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
995 mnt->auth_flavor_len = 1;
996 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
997 break;
998 case Opt_sec_spkm:
999 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1000 mnt->auth_flavor_len = 1;
1001 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1002 break;
1003 case Opt_sec_spkmi:
1004 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1005 mnt->auth_flavor_len = 1;
1006 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1007 break;
1008 case Opt_sec_spkmp:
1009 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1010 mnt->auth_flavor_len = 1;
1011 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1012 break;
1013 default:
1014 goto out_unrec_sec;
1015 }
1016 break;
1017 case Opt_proto:
1018 string = match_strdup(args);
1019 if (string == NULL)
1020 goto out_nomem;
1021 token = match_token(string,
1022 nfs_xprt_protocol_tokens, args);
1023 kfree(string);
1024
1025 switch (token) {
1026 case Opt_xprt_udp:
1027 mnt->flags &= ~NFS_MOUNT_TCP;
1028 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1029 mnt->timeo = 7;
1030 mnt->retrans = 5;
1031 break;
1032 case Opt_xprt_tcp:
1033 mnt->flags |= NFS_MOUNT_TCP;
1034 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1035 mnt->timeo = 600;
1036 mnt->retrans = 2;
1037 break;
1038 case Opt_xprt_rdma:
1039 /* vector side protocols to TCP */
1040 mnt->flags |= NFS_MOUNT_TCP;
1041 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1042 mnt->timeo = 600;
1043 mnt->retrans = 2;
1044 break;
1045 default:
1046 goto out_unrec_xprt;
1047 }
1048 break;
1049 case Opt_mountproto:
1050 string = match_strdup(args);
1051 if (string == NULL)
1052 goto out_nomem;
1053 token = match_token(string,
1054 nfs_xprt_protocol_tokens, args);
1055 kfree(string);
1056
1057 switch (token) {
1058 case Opt_xprt_udp:
1059 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1060 break;
1061 case Opt_xprt_tcp:
1062 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1063 break;
1064 case Opt_xprt_rdma: /* not used for side protocols */
1065 default:
1066 goto out_unrec_xprt;
1067 }
1068 break;
1069 case Opt_addr:
1070 string = match_strdup(args);
1071 if (string == NULL)
1072 goto out_nomem;
1073 nfs_parse_server_address(string, (struct sockaddr *)
1074 &mnt->nfs_server.address,
1075 &mnt->nfs_server.addrlen);
1076 kfree(string);
1077 break;
1078 case Opt_clientaddr:
1079 string = match_strdup(args);
1080 if (string == NULL)
1081 goto out_nomem;
1082 kfree(mnt->client_address);
1083 mnt->client_address = string;
1084 break;
1085 case Opt_mounthost:
1086 string = match_strdup(args);
1087 if (string == NULL)
1088 goto out_nomem;
1089 kfree(mnt->mount_server.hostname);
1090 mnt->mount_server.hostname = string;
1091 break;
1092 case Opt_mountaddr:
1093 string = match_strdup(args);
1094 if (string == NULL)
1095 goto out_nomem;
1096 nfs_parse_server_address(string, (struct sockaddr *)
1097 &mnt->mount_server.address,
1098 &mnt->mount_server.addrlen);
1099 kfree(string);
1100 break;
1101
1102 case Opt_userspace:
1103 case Opt_deprecated:
1104 break;
1105
1106 default:
1107 goto out_unknown;
1108 }
1109 }
1110
1111 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1112 mnt->nfs_server.port);
1113
1114 return 1;
1115
1116 out_nomem:
1117 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1118 return 0;
1119 out_security_failure:
1120 free_secdata(secdata);
1121 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1122 return 0;
1123 out_unrec_vers:
1124 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1125 return 0;
1126
1127 out_unrec_xprt:
1128 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1129 return 0;
1130
1131 out_unrec_sec:
1132 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1133 return 0;
1134
1135 out_unknown:
1136 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1137 return 0;
1138 }
1139
1140 /*
1141 * Use the remote server's MOUNT service to request the NFS file handle
1142 * corresponding to the provided path.
1143 */
1144 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1145 struct nfs_fh *root_fh)
1146 {
1147 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1148 char *hostname;
1149 int status;
1150
1151 if (args->mount_server.version == 0) {
1152 if (args->flags & NFS_MOUNT_VER3)
1153 args->mount_server.version = NFS_MNT3_VERSION;
1154 else
1155 args->mount_server.version = NFS_MNT_VERSION;
1156 }
1157
1158 if (args->mount_server.hostname)
1159 hostname = args->mount_server.hostname;
1160 else
1161 hostname = args->nfs_server.hostname;
1162
1163 /*
1164 * Construct the mount server's address.
1165 */
1166 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1167 memcpy(sap, &args->nfs_server.address,
1168 args->nfs_server.addrlen);
1169 args->mount_server.addrlen = args->nfs_server.addrlen;
1170 }
1171
1172 /*
1173 * autobind will be used if mount_server.port == 0
1174 */
1175 nfs_set_port(sap, args->mount_server.port);
1176
1177 /*
1178 * Now ask the mount server to map our export path
1179 * to a file handle.
1180 */
1181 status = nfs_mount(sap,
1182 args->mount_server.addrlen,
1183 hostname,
1184 args->nfs_server.export_path,
1185 args->mount_server.version,
1186 args->mount_server.protocol,
1187 root_fh);
1188 if (status == 0)
1189 return 0;
1190
1191 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1192 hostname, status);
1193 return status;
1194 }
1195
1196 /*
1197 * Validate the NFS2/NFS3 mount data
1198 * - fills in the mount root filehandle
1199 *
1200 * For option strings, user space handles the following behaviors:
1201 *
1202 * + DNS: mapping server host name to IP address ("addr=" option)
1203 *
1204 * + failure mode: how to behave if a mount request can't be handled
1205 * immediately ("fg/bg" option)
1206 *
1207 * + retry: how often to retry a mount request ("retry=" option)
1208 *
1209 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1210 * mountproto=tcp after mountproto=udp, and so on
1211 */
1212 static int nfs_validate_mount_data(void *options,
1213 struct nfs_parsed_mount_data *args,
1214 struct nfs_fh *mntfh,
1215 const char *dev_name)
1216 {
1217 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1218
1219 if (data == NULL)
1220 goto out_no_data;
1221
1222 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1223 args->rsize = NFS_MAX_FILE_IO_SIZE;
1224 args->wsize = NFS_MAX_FILE_IO_SIZE;
1225 args->timeo = 600;
1226 args->retrans = 2;
1227 args->acregmin = 3;
1228 args->acregmax = 60;
1229 args->acdirmin = 30;
1230 args->acdirmax = 60;
1231 args->mount_server.port = 0; /* autobind unless user sets port */
1232 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1233 args->nfs_server.port = 0; /* autobind unless user sets port */
1234 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1235
1236 switch (data->version) {
1237 case 1:
1238 data->namlen = 0;
1239 case 2:
1240 data->bsize = 0;
1241 case 3:
1242 if (data->flags & NFS_MOUNT_VER3)
1243 goto out_no_v3;
1244 data->root.size = NFS2_FHSIZE;
1245 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1246 case 4:
1247 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1248 goto out_no_sec;
1249 case 5:
1250 memset(data->context, 0, sizeof(data->context));
1251 case 6:
1252 if (data->flags & NFS_MOUNT_VER3)
1253 mntfh->size = data->root.size;
1254 else
1255 mntfh->size = NFS2_FHSIZE;
1256
1257 if (mntfh->size > sizeof(mntfh->data))
1258 goto out_invalid_fh;
1259
1260 memcpy(mntfh->data, data->root.data, mntfh->size);
1261 if (mntfh->size < sizeof(mntfh->data))
1262 memset(mntfh->data + mntfh->size, 0,
1263 sizeof(mntfh->data) - mntfh->size);
1264
1265 /*
1266 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1267 * can deal with.
1268 */
1269 args->flags = data->flags;
1270 args->rsize = data->rsize;
1271 args->wsize = data->wsize;
1272 args->timeo = data->timeo;
1273 args->retrans = data->retrans;
1274 args->acregmin = data->acregmin;
1275 args->acregmax = data->acregmax;
1276 args->acdirmin = data->acdirmin;
1277 args->acdirmax = data->acdirmax;
1278
1279 memcpy(&args->nfs_server.address, &data->addr,
1280 sizeof(data->addr));
1281 args->nfs_server.addrlen = sizeof(data->addr);
1282 if (!nfs_verify_server_address((struct sockaddr *)
1283 &args->nfs_server.address))
1284 goto out_no_address;
1285
1286 if (!(data->flags & NFS_MOUNT_TCP))
1287 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1288 /* N.B. caller will free nfs_server.hostname in all cases */
1289 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1290 args->namlen = data->namlen;
1291 args->bsize = data->bsize;
1292 args->auth_flavors[0] = data->pseudoflavor;
1293 if (!args->nfs_server.hostname)
1294 goto out_nomem;
1295
1296 /*
1297 * The legacy version 6 binary mount data from userspace has a
1298 * field used only to transport selinux information into the
1299 * the kernel. To continue to support that functionality we
1300 * have a touch of selinux knowledge here in the NFS code. The
1301 * userspace code converted context=blah to just blah so we are
1302 * converting back to the full string selinux understands.
1303 */
1304 if (data->context[0]){
1305 #ifdef CONFIG_SECURITY_SELINUX
1306 int rc;
1307 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1308 if (!opts_str)
1309 return -ENOMEM;
1310 strcpy(opts_str, "context=");
1311 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1312 strcat(opts_str, &data->context[0]);
1313 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1314 kfree(opts_str);
1315 if (rc)
1316 return rc;
1317 #else
1318 return -EINVAL;
1319 #endif
1320 }
1321
1322 break;
1323 default: {
1324 unsigned int len;
1325 char *c;
1326 int status;
1327
1328 if (nfs_parse_mount_options((char *)options, args) == 0)
1329 return -EINVAL;
1330
1331 if (!nfs_verify_server_address((struct sockaddr *)
1332 &args->nfs_server.address))
1333 goto out_no_address;
1334
1335 c = strchr(dev_name, ':');
1336 if (c == NULL)
1337 return -EINVAL;
1338 len = c - dev_name;
1339 /* N.B. caller will free nfs_server.hostname in all cases */
1340 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1341 if (!args->nfs_server.hostname)
1342 goto out_nomem;
1343
1344 c++;
1345 if (strlen(c) > NFS_MAXPATHLEN)
1346 return -ENAMETOOLONG;
1347 args->nfs_server.export_path = c;
1348
1349 status = nfs_try_mount(args, mntfh);
1350 if (status)
1351 return status;
1352
1353 break;
1354 }
1355 }
1356
1357 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1358 args->auth_flavors[0] = RPC_AUTH_UNIX;
1359
1360 #ifndef CONFIG_NFS_V3
1361 if (args->flags & NFS_MOUNT_VER3)
1362 goto out_v3_not_compiled;
1363 #endif /* !CONFIG_NFS_V3 */
1364
1365 return 0;
1366
1367 out_no_data:
1368 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1369 return -EINVAL;
1370
1371 out_no_v3:
1372 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1373 data->version);
1374 return -EINVAL;
1375
1376 out_no_sec:
1377 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1378 return -EINVAL;
1379
1380 #ifndef CONFIG_NFS_V3
1381 out_v3_not_compiled:
1382 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1383 return -EPROTONOSUPPORT;
1384 #endif /* !CONFIG_NFS_V3 */
1385
1386 out_nomem:
1387 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1388 return -ENOMEM;
1389
1390 out_no_address:
1391 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1392 return -EINVAL;
1393
1394 out_invalid_fh:
1395 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1396 return -EINVAL;
1397 }
1398
1399 /*
1400 * Initialise the common bits of the superblock
1401 */
1402 static inline void nfs_initialise_sb(struct super_block *sb)
1403 {
1404 struct nfs_server *server = NFS_SB(sb);
1405
1406 sb->s_magic = NFS_SUPER_MAGIC;
1407
1408 /* We probably want something more informative here */
1409 snprintf(sb->s_id, sizeof(sb->s_id),
1410 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1411
1412 if (sb->s_blocksize == 0)
1413 sb->s_blocksize = nfs_block_bits(server->wsize,
1414 &sb->s_blocksize_bits);
1415
1416 if (server->flags & NFS_MOUNT_NOAC)
1417 sb->s_flags |= MS_SYNCHRONOUS;
1418
1419 nfs_super_set_maxbytes(sb, server->maxfilesize);
1420 }
1421
1422 /*
1423 * Finish setting up an NFS2/3 superblock
1424 */
1425 static void nfs_fill_super(struct super_block *sb,
1426 struct nfs_parsed_mount_data *data)
1427 {
1428 struct nfs_server *server = NFS_SB(sb);
1429
1430 sb->s_blocksize_bits = 0;
1431 sb->s_blocksize = 0;
1432 if (data->bsize)
1433 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1434
1435 if (server->flags & NFS_MOUNT_VER3) {
1436 /* The VFS shouldn't apply the umask to mode bits. We will do
1437 * so ourselves when necessary.
1438 */
1439 sb->s_flags |= MS_POSIXACL;
1440 sb->s_time_gran = 1;
1441 }
1442
1443 sb->s_op = &nfs_sops;
1444 nfs_initialise_sb(sb);
1445 }
1446
1447 /*
1448 * Finish setting up a cloned NFS2/3 superblock
1449 */
1450 static void nfs_clone_super(struct super_block *sb,
1451 const struct super_block *old_sb)
1452 {
1453 struct nfs_server *server = NFS_SB(sb);
1454
1455 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1456 sb->s_blocksize = old_sb->s_blocksize;
1457 sb->s_maxbytes = old_sb->s_maxbytes;
1458
1459 if (server->flags & NFS_MOUNT_VER3) {
1460 /* The VFS shouldn't apply the umask to mode bits. We will do
1461 * so ourselves when necessary.
1462 */
1463 sb->s_flags |= MS_POSIXACL;
1464 sb->s_time_gran = 1;
1465 }
1466
1467 sb->s_op = old_sb->s_op;
1468 nfs_initialise_sb(sb);
1469 }
1470
1471 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1472
1473 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1474 {
1475 const struct nfs_server *a = s->s_fs_info;
1476 const struct rpc_clnt *clnt_a = a->client;
1477 const struct rpc_clnt *clnt_b = b->client;
1478
1479 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1480 goto Ebusy;
1481 if (a->nfs_client != b->nfs_client)
1482 goto Ebusy;
1483 if (a->flags != b->flags)
1484 goto Ebusy;
1485 if (a->wsize != b->wsize)
1486 goto Ebusy;
1487 if (a->rsize != b->rsize)
1488 goto Ebusy;
1489 if (a->acregmin != b->acregmin)
1490 goto Ebusy;
1491 if (a->acregmax != b->acregmax)
1492 goto Ebusy;
1493 if (a->acdirmin != b->acdirmin)
1494 goto Ebusy;
1495 if (a->acdirmax != b->acdirmax)
1496 goto Ebusy;
1497 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1498 goto Ebusy;
1499 return 1;
1500 Ebusy:
1501 return 0;
1502 }
1503
1504 struct nfs_sb_mountdata {
1505 struct nfs_server *server;
1506 int mntflags;
1507 };
1508
1509 static int nfs_set_super(struct super_block *s, void *data)
1510 {
1511 struct nfs_sb_mountdata *sb_mntdata = data;
1512 struct nfs_server *server = sb_mntdata->server;
1513 int ret;
1514
1515 s->s_flags = sb_mntdata->mntflags;
1516 s->s_fs_info = server;
1517 ret = set_anon_super(s, server);
1518 if (ret == 0)
1519 server->s_dev = s->s_dev;
1520 return ret;
1521 }
1522
1523 static int nfs_compare_super_address(struct nfs_server *server1,
1524 struct nfs_server *server2)
1525 {
1526 struct sockaddr *sap1, *sap2;
1527
1528 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1529 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1530
1531 if (sap1->sa_family != sap2->sa_family)
1532 return 0;
1533
1534 switch (sap1->sa_family) {
1535 case AF_INET: {
1536 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1537 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1538 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1539 return 0;
1540 if (sin1->sin_port != sin2->sin_port)
1541 return 0;
1542 break;
1543 }
1544 case AF_INET6: {
1545 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1546 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1547 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1548 return 0;
1549 if (sin1->sin6_port != sin2->sin6_port)
1550 return 0;
1551 break;
1552 }
1553 default:
1554 return 0;
1555 }
1556
1557 return 1;
1558 }
1559
1560 static int nfs_compare_super(struct super_block *sb, void *data)
1561 {
1562 struct nfs_sb_mountdata *sb_mntdata = data;
1563 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1564 int mntflags = sb_mntdata->mntflags;
1565
1566 if (!nfs_compare_super_address(old, server))
1567 return 0;
1568 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1569 if (old->flags & NFS_MOUNT_UNSHARED)
1570 return 0;
1571 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1572 return 0;
1573 return nfs_compare_mount_options(sb, server, mntflags);
1574 }
1575
1576 static int nfs_bdi_register(struct nfs_server *server)
1577 {
1578 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1579 }
1580
1581 static int nfs_get_sb(struct file_system_type *fs_type,
1582 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1583 {
1584 struct nfs_server *server = NULL;
1585 struct super_block *s;
1586 struct nfs_parsed_mount_data *data;
1587 struct nfs_fh *mntfh;
1588 struct dentry *mntroot;
1589 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1590 struct nfs_sb_mountdata sb_mntdata = {
1591 .mntflags = flags,
1592 };
1593 int error = -ENOMEM;
1594
1595 data = kzalloc(sizeof(*data), GFP_KERNEL);
1596 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1597 if (data == NULL || mntfh == NULL)
1598 goto out_free_fh;
1599
1600 security_init_mnt_opts(&data->lsm_opts);
1601
1602 /* Validate the mount data */
1603 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1604 if (error < 0)
1605 goto out;
1606
1607 /* Get a volume representation */
1608 server = nfs_create_server(data, mntfh);
1609 if (IS_ERR(server)) {
1610 error = PTR_ERR(server);
1611 goto out;
1612 }
1613 sb_mntdata.server = server;
1614
1615 if (server->flags & NFS_MOUNT_UNSHARED)
1616 compare_super = NULL;
1617
1618 /* Get a superblock - note that we may end up sharing one that already exists */
1619 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1620 if (IS_ERR(s)) {
1621 error = PTR_ERR(s);
1622 goto out_err_nosb;
1623 }
1624
1625 if (s->s_fs_info != server) {
1626 nfs_free_server(server);
1627 server = NULL;
1628 } else {
1629 error = nfs_bdi_register(server);
1630 if (error)
1631 goto error_splat_super;
1632 }
1633
1634 if (!s->s_root) {
1635 /* initial superblock/root creation */
1636 nfs_fill_super(s, data);
1637 }
1638
1639 mntroot = nfs_get_root(s, mntfh);
1640 if (IS_ERR(mntroot)) {
1641 error = PTR_ERR(mntroot);
1642 goto error_splat_super;
1643 }
1644
1645 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1646 if (error)
1647 goto error_splat_root;
1648
1649 s->s_flags |= MS_ACTIVE;
1650 mnt->mnt_sb = s;
1651 mnt->mnt_root = mntroot;
1652 error = 0;
1653
1654 out:
1655 kfree(data->nfs_server.hostname);
1656 kfree(data->mount_server.hostname);
1657 security_free_mnt_opts(&data->lsm_opts);
1658 out_free_fh:
1659 kfree(mntfh);
1660 kfree(data);
1661 return error;
1662
1663 out_err_nosb:
1664 nfs_free_server(server);
1665 goto out;
1666
1667 error_splat_root:
1668 dput(mntroot);
1669 error_splat_super:
1670 up_write(&s->s_umount);
1671 deactivate_super(s);
1672 goto out;
1673 }
1674
1675 /*
1676 * Destroy an NFS2/3 superblock
1677 */
1678 static void nfs_kill_super(struct super_block *s)
1679 {
1680 struct nfs_server *server = NFS_SB(s);
1681
1682 bdi_unregister(&server->backing_dev_info);
1683 kill_anon_super(s);
1684 nfs_free_server(server);
1685 }
1686
1687 /*
1688 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1689 */
1690 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1691 const char *dev_name, void *raw_data,
1692 struct vfsmount *mnt)
1693 {
1694 struct nfs_clone_mount *data = raw_data;
1695 struct super_block *s;
1696 struct nfs_server *server;
1697 struct dentry *mntroot;
1698 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1699 struct nfs_sb_mountdata sb_mntdata = {
1700 .mntflags = flags,
1701 };
1702 int error;
1703
1704 dprintk("--> nfs_xdev_get_sb()\n");
1705
1706 /* create a new volume representation */
1707 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1708 if (IS_ERR(server)) {
1709 error = PTR_ERR(server);
1710 goto out_err_noserver;
1711 }
1712 sb_mntdata.server = server;
1713
1714 if (server->flags & NFS_MOUNT_UNSHARED)
1715 compare_super = NULL;
1716
1717 /* Get a superblock - note that we may end up sharing one that already exists */
1718 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1719 if (IS_ERR(s)) {
1720 error = PTR_ERR(s);
1721 goto out_err_nosb;
1722 }
1723
1724 if (s->s_fs_info != server) {
1725 nfs_free_server(server);
1726 server = NULL;
1727 } else {
1728 error = nfs_bdi_register(server);
1729 if (error)
1730 goto error_splat_super;
1731 }
1732
1733 if (!s->s_root) {
1734 /* initial superblock/root creation */
1735 nfs_clone_super(s, data->sb);
1736 }
1737
1738 mntroot = nfs_get_root(s, data->fh);
1739 if (IS_ERR(mntroot)) {
1740 error = PTR_ERR(mntroot);
1741 goto error_splat_super;
1742 }
1743 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1744 dput(mntroot);
1745 error = -ESTALE;
1746 goto error_splat_super;
1747 }
1748
1749 s->s_flags |= MS_ACTIVE;
1750 mnt->mnt_sb = s;
1751 mnt->mnt_root = mntroot;
1752
1753 /* clone any lsm security options from the parent to the new sb */
1754 security_sb_clone_mnt_opts(data->sb, s);
1755
1756 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1757 return 0;
1758
1759 out_err_nosb:
1760 nfs_free_server(server);
1761 out_err_noserver:
1762 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1763 return error;
1764
1765 error_splat_super:
1766 up_write(&s->s_umount);
1767 deactivate_super(s);
1768 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1769 return error;
1770 }
1771
1772 #ifdef CONFIG_NFS_V4
1773
1774 /*
1775 * Finish setting up a cloned NFS4 superblock
1776 */
1777 static void nfs4_clone_super(struct super_block *sb,
1778 const struct super_block *old_sb)
1779 {
1780 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1781 sb->s_blocksize = old_sb->s_blocksize;
1782 sb->s_maxbytes = old_sb->s_maxbytes;
1783 sb->s_time_gran = 1;
1784 sb->s_op = old_sb->s_op;
1785 nfs_initialise_sb(sb);
1786 }
1787
1788 /*
1789 * Set up an NFS4 superblock
1790 */
1791 static void nfs4_fill_super(struct super_block *sb)
1792 {
1793 sb->s_time_gran = 1;
1794 sb->s_op = &nfs4_sops;
1795 nfs_initialise_sb(sb);
1796 }
1797
1798 /*
1799 * Validate NFSv4 mount options
1800 */
1801 static int nfs4_validate_mount_data(void *options,
1802 struct nfs_parsed_mount_data *args,
1803 const char *dev_name)
1804 {
1805 struct sockaddr_in *ap;
1806 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1807 char *c;
1808
1809 if (data == NULL)
1810 goto out_no_data;
1811
1812 args->rsize = NFS_MAX_FILE_IO_SIZE;
1813 args->wsize = NFS_MAX_FILE_IO_SIZE;
1814 args->timeo = 600;
1815 args->retrans = 2;
1816 args->acregmin = 3;
1817 args->acregmax = 60;
1818 args->acdirmin = 30;
1819 args->acdirmax = 60;
1820 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
1821 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1822
1823 switch (data->version) {
1824 case 1:
1825 ap = (struct sockaddr_in *)&args->nfs_server.address;
1826 if (data->host_addrlen > sizeof(args->nfs_server.address))
1827 goto out_no_address;
1828 if (data->host_addrlen == 0)
1829 goto out_no_address;
1830 args->nfs_server.addrlen = data->host_addrlen;
1831 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1832 return -EFAULT;
1833 if (!nfs_verify_server_address((struct sockaddr *)
1834 &args->nfs_server.address))
1835 goto out_no_address;
1836
1837 switch (data->auth_flavourlen) {
1838 case 0:
1839 args->auth_flavors[0] = RPC_AUTH_UNIX;
1840 break;
1841 case 1:
1842 if (copy_from_user(&args->auth_flavors[0],
1843 data->auth_flavours,
1844 sizeof(args->auth_flavors[0])))
1845 return -EFAULT;
1846 break;
1847 default:
1848 goto out_inval_auth;
1849 }
1850
1851 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1852 if (IS_ERR(c))
1853 return PTR_ERR(c);
1854 args->nfs_server.hostname = c;
1855
1856 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1857 if (IS_ERR(c))
1858 return PTR_ERR(c);
1859 args->nfs_server.export_path = c;
1860 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1861
1862 c = strndup_user(data->client_addr.data, 16);
1863 if (IS_ERR(c))
1864 return PTR_ERR(c);
1865 args->client_address = c;
1866
1867 /*
1868 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1869 * can deal with.
1870 */
1871
1872 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1873 args->rsize = data->rsize;
1874 args->wsize = data->wsize;
1875 args->timeo = data->timeo;
1876 args->retrans = data->retrans;
1877 args->acregmin = data->acregmin;
1878 args->acregmax = data->acregmax;
1879 args->acdirmin = data->acdirmin;
1880 args->acdirmax = data->acdirmax;
1881 args->nfs_server.protocol = data->proto;
1882
1883 break;
1884 default: {
1885 unsigned int len;
1886
1887 if (nfs_parse_mount_options((char *)options, args) == 0)
1888 return -EINVAL;
1889
1890 if (!nfs_verify_server_address((struct sockaddr *)
1891 &args->nfs_server.address))
1892 return -EINVAL;
1893
1894 switch (args->auth_flavor_len) {
1895 case 0:
1896 args->auth_flavors[0] = RPC_AUTH_UNIX;
1897 break;
1898 case 1:
1899 break;
1900 default:
1901 goto out_inval_auth;
1902 }
1903
1904 /*
1905 * Split "dev_name" into "hostname:mntpath".
1906 */
1907 c = strchr(dev_name, ':');
1908 if (c == NULL)
1909 return -EINVAL;
1910 /* while calculating len, pretend ':' is '\0' */
1911 len = c - dev_name;
1912 if (len > NFS4_MAXNAMLEN)
1913 return -ENAMETOOLONG;
1914 /* N.B. caller will free nfs_server.hostname in all cases */
1915 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1916 if (!args->nfs_server.hostname)
1917 goto out_nomem;
1918
1919 c++; /* step over the ':' */
1920 len = strlen(c);
1921 if (len > NFS4_MAXPATHLEN)
1922 return -ENAMETOOLONG;
1923 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1924 if (!args->nfs_server.export_path)
1925 goto out_nomem;
1926
1927 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1928
1929 if (args->client_address == NULL)
1930 goto out_no_client_address;
1931
1932 break;
1933 }
1934 }
1935
1936 return 0;
1937
1938 out_no_data:
1939 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1940 return -EINVAL;
1941
1942 out_inval_auth:
1943 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1944 data->auth_flavourlen);
1945 return -EINVAL;
1946
1947 out_nomem:
1948 dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
1949 return -ENOMEM;
1950
1951 out_no_address:
1952 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1953 return -EINVAL;
1954
1955 out_no_client_address:
1956 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1957 return -EINVAL;
1958 }
1959
1960 /*
1961 * Get the superblock for an NFS4 mountpoint
1962 */
1963 static int nfs4_get_sb(struct file_system_type *fs_type,
1964 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1965 {
1966 struct nfs_parsed_mount_data *data;
1967 struct super_block *s;
1968 struct nfs_server *server;
1969 struct nfs_fh *mntfh;
1970 struct dentry *mntroot;
1971 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1972 struct nfs_sb_mountdata sb_mntdata = {
1973 .mntflags = flags,
1974 };
1975 int error = -ENOMEM;
1976
1977 data = kzalloc(sizeof(*data), GFP_KERNEL);
1978 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1979 if (data == NULL || mntfh == NULL)
1980 goto out_free_fh;
1981
1982 security_init_mnt_opts(&data->lsm_opts);
1983
1984 /* Validate the mount data */
1985 error = nfs4_validate_mount_data(raw_data, data, dev_name);
1986 if (error < 0)
1987 goto out;
1988
1989 /* Get a volume representation */
1990 server = nfs4_create_server(data, mntfh);
1991 if (IS_ERR(server)) {
1992 error = PTR_ERR(server);
1993 goto out;
1994 }
1995 sb_mntdata.server = server;
1996
1997 if (server->flags & NFS4_MOUNT_UNSHARED)
1998 compare_super = NULL;
1999
2000 /* Get a superblock - note that we may end up sharing one that already exists */
2001 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2002 if (IS_ERR(s)) {
2003 error = PTR_ERR(s);
2004 goto out_free;
2005 }
2006
2007 if (s->s_fs_info != server) {
2008 nfs_free_server(server);
2009 server = NULL;
2010 } else {
2011 error = nfs_bdi_register(server);
2012 if (error)
2013 goto error_splat_super;
2014 }
2015
2016 if (!s->s_root) {
2017 /* initial superblock/root creation */
2018 nfs4_fill_super(s);
2019 }
2020
2021 mntroot = nfs4_get_root(s, mntfh);
2022 if (IS_ERR(mntroot)) {
2023 error = PTR_ERR(mntroot);
2024 goto error_splat_super;
2025 }
2026
2027 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2028 if (error)
2029 goto error_splat_root;
2030
2031 s->s_flags |= MS_ACTIVE;
2032 mnt->mnt_sb = s;
2033 mnt->mnt_root = mntroot;
2034 error = 0;
2035
2036 out:
2037 kfree(data->client_address);
2038 kfree(data->nfs_server.export_path);
2039 kfree(data->nfs_server.hostname);
2040 security_free_mnt_opts(&data->lsm_opts);
2041 out_free_fh:
2042 kfree(mntfh);
2043 kfree(data);
2044 return error;
2045
2046 out_free:
2047 nfs_free_server(server);
2048 goto out;
2049
2050 error_splat_root:
2051 dput(mntroot);
2052 error_splat_super:
2053 up_write(&s->s_umount);
2054 deactivate_super(s);
2055 goto out;
2056 }
2057
2058 static void nfs4_kill_super(struct super_block *sb)
2059 {
2060 struct nfs_server *server = NFS_SB(sb);
2061
2062 nfs_return_all_delegations(sb);
2063 kill_anon_super(sb);
2064
2065 nfs4_renewd_prepare_shutdown(server);
2066 nfs_free_server(server);
2067 }
2068
2069 /*
2070 * Clone an NFS4 server record on xdev traversal (FSID-change)
2071 */
2072 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2073 const char *dev_name, void *raw_data,
2074 struct vfsmount *mnt)
2075 {
2076 struct nfs_clone_mount *data = raw_data;
2077 struct super_block *s;
2078 struct nfs_server *server;
2079 struct dentry *mntroot;
2080 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2081 struct nfs_sb_mountdata sb_mntdata = {
2082 .mntflags = flags,
2083 };
2084 int error;
2085
2086 dprintk("--> nfs4_xdev_get_sb()\n");
2087
2088 /* create a new volume representation */
2089 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2090 if (IS_ERR(server)) {
2091 error = PTR_ERR(server);
2092 goto out_err_noserver;
2093 }
2094 sb_mntdata.server = server;
2095
2096 if (server->flags & NFS4_MOUNT_UNSHARED)
2097 compare_super = NULL;
2098
2099 /* Get a superblock - note that we may end up sharing one that already exists */
2100 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2101 if (IS_ERR(s)) {
2102 error = PTR_ERR(s);
2103 goto out_err_nosb;
2104 }
2105
2106 if (s->s_fs_info != server) {
2107 nfs_free_server(server);
2108 server = NULL;
2109 } else {
2110 error = nfs_bdi_register(server);
2111 if (error)
2112 goto error_splat_super;
2113 }
2114
2115 if (!s->s_root) {
2116 /* initial superblock/root creation */
2117 nfs4_clone_super(s, data->sb);
2118 }
2119
2120 mntroot = nfs4_get_root(s, data->fh);
2121 if (IS_ERR(mntroot)) {
2122 error = PTR_ERR(mntroot);
2123 goto error_splat_super;
2124 }
2125 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2126 dput(mntroot);
2127 error = -ESTALE;
2128 goto error_splat_super;
2129 }
2130
2131 s->s_flags |= MS_ACTIVE;
2132 mnt->mnt_sb = s;
2133 mnt->mnt_root = mntroot;
2134
2135 security_sb_clone_mnt_opts(data->sb, s);
2136
2137 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2138 return 0;
2139
2140 out_err_nosb:
2141 nfs_free_server(server);
2142 out_err_noserver:
2143 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2144 return error;
2145
2146 error_splat_super:
2147 up_write(&s->s_umount);
2148 deactivate_super(s);
2149 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2150 return error;
2151 }
2152
2153 /*
2154 * Create an NFS4 server record on referral traversal
2155 */
2156 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2157 const char *dev_name, void *raw_data,
2158 struct vfsmount *mnt)
2159 {
2160 struct nfs_clone_mount *data = raw_data;
2161 struct super_block *s;
2162 struct nfs_server *server;
2163 struct dentry *mntroot;
2164 struct nfs_fh mntfh;
2165 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2166 struct nfs_sb_mountdata sb_mntdata = {
2167 .mntflags = flags,
2168 };
2169 int error;
2170
2171 dprintk("--> nfs4_referral_get_sb()\n");
2172
2173 /* create a new volume representation */
2174 server = nfs4_create_referral_server(data, &mntfh);
2175 if (IS_ERR(server)) {
2176 error = PTR_ERR(server);
2177 goto out_err_noserver;
2178 }
2179 sb_mntdata.server = server;
2180
2181 if (server->flags & NFS4_MOUNT_UNSHARED)
2182 compare_super = NULL;
2183
2184 /* Get a superblock - note that we may end up sharing one that already exists */
2185 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2186 if (IS_ERR(s)) {
2187 error = PTR_ERR(s);
2188 goto out_err_nosb;
2189 }
2190
2191 if (s->s_fs_info != server) {
2192 nfs_free_server(server);
2193 server = NULL;
2194 } else {
2195 error = nfs_bdi_register(server);
2196 if (error)
2197 goto error_splat_super;
2198 }
2199
2200 if (!s->s_root) {
2201 /* initial superblock/root creation */
2202 nfs4_fill_super(s);
2203 }
2204
2205 mntroot = nfs4_get_root(s, &mntfh);
2206 if (IS_ERR(mntroot)) {
2207 error = PTR_ERR(mntroot);
2208 goto error_splat_super;
2209 }
2210 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2211 dput(mntroot);
2212 error = -ESTALE;
2213 goto error_splat_super;
2214 }
2215
2216 s->s_flags |= MS_ACTIVE;
2217 mnt->mnt_sb = s;
2218 mnt->mnt_root = mntroot;
2219
2220 security_sb_clone_mnt_opts(data->sb, s);
2221
2222 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2223 return 0;
2224
2225 out_err_nosb:
2226 nfs_free_server(server);
2227 out_err_noserver:
2228 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2229 return error;
2230
2231 error_splat_super:
2232 up_write(&s->s_umount);
2233 deactivate_super(s);
2234 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2235 return error;
2236 }
2237
2238 #endif /* CONFIG_NFS_V4 */
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