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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[deliverable/linux.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <Alan.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_err, NULL }
194 };
195
196
197 static void nfs_umount_begin(struct vfsmount *, int);
198 static int nfs_statfs(struct dentry *, struct kstatfs *);
199 static int nfs_show_options(struct seq_file *, struct vfsmount *);
200 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
201 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
202 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
203 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
204 static void nfs_kill_super(struct super_block *);
205 static void nfs_put_super(struct super_block *);
206
207 static struct file_system_type nfs_fs_type = {
208 .owner = THIS_MODULE,
209 .name = "nfs",
210 .get_sb = nfs_get_sb,
211 .kill_sb = nfs_kill_super,
212 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
213 };
214
215 struct file_system_type nfs_xdev_fs_type = {
216 .owner = THIS_MODULE,
217 .name = "nfs",
218 .get_sb = nfs_xdev_get_sb,
219 .kill_sb = nfs_kill_super,
220 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
221 };
222
223 static const struct super_operations nfs_sops = {
224 .alloc_inode = nfs_alloc_inode,
225 .destroy_inode = nfs_destroy_inode,
226 .write_inode = nfs_write_inode,
227 .put_super = nfs_put_super,
228 .statfs = nfs_statfs,
229 .clear_inode = nfs_clear_inode,
230 .umount_begin = nfs_umount_begin,
231 .show_options = nfs_show_options,
232 .show_stats = nfs_show_stats,
233 };
234
235 #ifdef CONFIG_NFS_V4
236 static int nfs4_get_sb(struct file_system_type *fs_type,
237 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
238 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
239 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
240 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
241 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
242 static void nfs4_kill_super(struct super_block *sb);
243
244 static struct file_system_type nfs4_fs_type = {
245 .owner = THIS_MODULE,
246 .name = "nfs4",
247 .get_sb = nfs4_get_sb,
248 .kill_sb = nfs4_kill_super,
249 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
250 };
251
252 struct file_system_type nfs4_xdev_fs_type = {
253 .owner = THIS_MODULE,
254 .name = "nfs4",
255 .get_sb = nfs4_xdev_get_sb,
256 .kill_sb = nfs4_kill_super,
257 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
258 };
259
260 struct file_system_type nfs4_referral_fs_type = {
261 .owner = THIS_MODULE,
262 .name = "nfs4",
263 .get_sb = nfs4_referral_get_sb,
264 .kill_sb = nfs4_kill_super,
265 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
266 };
267
268 static const struct super_operations nfs4_sops = {
269 .alloc_inode = nfs_alloc_inode,
270 .destroy_inode = nfs_destroy_inode,
271 .write_inode = nfs_write_inode,
272 .statfs = nfs_statfs,
273 .clear_inode = nfs4_clear_inode,
274 .umount_begin = nfs_umount_begin,
275 .show_options = nfs_show_options,
276 .show_stats = nfs_show_stats,
277 };
278 #endif
279
280 static struct shrinker acl_shrinker = {
281 .shrink = nfs_access_cache_shrinker,
282 .seeks = DEFAULT_SEEKS,
283 };
284
285 /*
286 * Register the NFS filesystems
287 */
288 int __init register_nfs_fs(void)
289 {
290 int ret;
291
292 ret = register_filesystem(&nfs_fs_type);
293 if (ret < 0)
294 goto error_0;
295
296 ret = nfs_register_sysctl();
297 if (ret < 0)
298 goto error_1;
299 #ifdef CONFIG_NFS_V4
300 ret = register_filesystem(&nfs4_fs_type);
301 if (ret < 0)
302 goto error_2;
303 #endif
304 register_shrinker(&acl_shrinker);
305 return 0;
306
307 #ifdef CONFIG_NFS_V4
308 error_2:
309 nfs_unregister_sysctl();
310 #endif
311 error_1:
312 unregister_filesystem(&nfs_fs_type);
313 error_0:
314 return ret;
315 }
316
317 /*
318 * Unregister the NFS filesystems
319 */
320 void __exit unregister_nfs_fs(void)
321 {
322 unregister_shrinker(&acl_shrinker);
323 #ifdef CONFIG_NFS_V4
324 unregister_filesystem(&nfs4_fs_type);
325 #endif
326 nfs_unregister_sysctl();
327 unregister_filesystem(&nfs_fs_type);
328 }
329
330 void nfs_sb_active(struct nfs_server *server)
331 {
332 atomic_inc(&server->active);
333 }
334
335 void nfs_sb_deactive(struct nfs_server *server)
336 {
337 if (atomic_dec_and_test(&server->active))
338 wake_up(&server->active_wq);
339 }
340
341 static void nfs_put_super(struct super_block *sb)
342 {
343 struct nfs_server *server = NFS_SB(sb);
344 /*
345 * Make sure there are no outstanding ops to this server.
346 * If so, wait for them to finish before allowing the
347 * unmount to continue.
348 */
349 wait_event(server->active_wq, atomic_read(&server->active) == 0);
350 }
351
352 /*
353 * Deliver file system statistics to userspace
354 */
355 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
356 {
357 struct nfs_server *server = NFS_SB(dentry->d_sb);
358 unsigned char blockbits;
359 unsigned long blockres;
360 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
361 struct nfs_fattr fattr;
362 struct nfs_fsstat res = {
363 .fattr = &fattr,
364 };
365 int error;
366
367 lock_kernel();
368
369 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
370 if (error < 0)
371 goto out_err;
372 buf->f_type = NFS_SUPER_MAGIC;
373
374 /*
375 * Current versions of glibc do not correctly handle the
376 * case where f_frsize != f_bsize. Eventually we want to
377 * report the value of wtmult in this field.
378 */
379 buf->f_frsize = dentry->d_sb->s_blocksize;
380
381 /*
382 * On most *nix systems, f_blocks, f_bfree, and f_bavail
383 * are reported in units of f_frsize. Linux hasn't had
384 * an f_frsize field in its statfs struct until recently,
385 * thus historically Linux's sys_statfs reports these
386 * fields in units of f_bsize.
387 */
388 buf->f_bsize = dentry->d_sb->s_blocksize;
389 blockbits = dentry->d_sb->s_blocksize_bits;
390 blockres = (1 << blockbits) - 1;
391 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
392 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
393 buf->f_bavail = (res.abytes + blockres) >> blockbits;
394
395 buf->f_files = res.tfiles;
396 buf->f_ffree = res.afiles;
397
398 buf->f_namelen = server->namelen;
399
400 unlock_kernel();
401 return 0;
402
403 out_err:
404 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
405 unlock_kernel();
406 return error;
407 }
408
409 /*
410 * Map the security flavour number to a name
411 */
412 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
413 {
414 static const struct {
415 rpc_authflavor_t flavour;
416 const char *str;
417 } sec_flavours[] = {
418 { RPC_AUTH_NULL, "null" },
419 { RPC_AUTH_UNIX, "sys" },
420 { RPC_AUTH_GSS_KRB5, "krb5" },
421 { RPC_AUTH_GSS_KRB5I, "krb5i" },
422 { RPC_AUTH_GSS_KRB5P, "krb5p" },
423 { RPC_AUTH_GSS_LKEY, "lkey" },
424 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
425 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
426 { RPC_AUTH_GSS_SPKM, "spkm" },
427 { RPC_AUTH_GSS_SPKMI, "spkmi" },
428 { RPC_AUTH_GSS_SPKMP, "spkmp" },
429 { UINT_MAX, "unknown" }
430 };
431 int i;
432
433 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
434 if (sec_flavours[i].flavour == flavour)
435 break;
436 }
437 return sec_flavours[i].str;
438 }
439
440 /*
441 * Describe the mount options in force on this server representation
442 */
443 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
444 {
445 static const struct proc_nfs_info {
446 int flag;
447 const char *str;
448 const char *nostr;
449 } nfs_info[] = {
450 { NFS_MOUNT_SOFT, ",soft", ",hard" },
451 { NFS_MOUNT_NOCTO, ",nocto", "" },
452 { NFS_MOUNT_NOAC, ",noac", "" },
453 { NFS_MOUNT_NONLM, ",nolock", "" },
454 { NFS_MOUNT_NOACL, ",noacl", "" },
455 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
456 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
457 { 0, NULL, NULL }
458 };
459 const struct proc_nfs_info *nfs_infop;
460 struct nfs_client *clp = nfss->nfs_client;
461
462 seq_printf(m, ",vers=%d", clp->rpc_ops->version);
463 seq_printf(m, ",rsize=%d", nfss->rsize);
464 seq_printf(m, ",wsize=%d", nfss->wsize);
465 if (nfss->acregmin != 3*HZ || showdefaults)
466 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
467 if (nfss->acregmax != 60*HZ || showdefaults)
468 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
469 if (nfss->acdirmin != 30*HZ || showdefaults)
470 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
471 if (nfss->acdirmax != 60*HZ || showdefaults)
472 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
473 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
474 if (nfss->flags & nfs_infop->flag)
475 seq_puts(m, nfs_infop->str);
476 else
477 seq_puts(m, nfs_infop->nostr);
478 }
479 seq_printf(m, ",proto=%s",
480 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
481 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
482 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
483 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
484 }
485
486 /*
487 * Describe the mount options on this VFS mountpoint
488 */
489 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
490 {
491 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
492
493 nfs_show_mount_options(m, nfss, 0);
494
495 seq_printf(m, ",addr=%s",
496 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
497 RPC_DISPLAY_ADDR));
498
499 return 0;
500 }
501
502 /*
503 * Present statistical information for this VFS mountpoint
504 */
505 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
506 {
507 int i, cpu;
508 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
509 struct rpc_auth *auth = nfss->client->cl_auth;
510 struct nfs_iostats totals = { };
511
512 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
513
514 /*
515 * Display all mount option settings
516 */
517 seq_printf(m, "\n\topts:\t");
518 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
519 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
520 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
521 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
522 nfs_show_mount_options(m, nfss, 1);
523
524 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
525
526 seq_printf(m, "\n\tcaps:\t");
527 seq_printf(m, "caps=0x%x", nfss->caps);
528 seq_printf(m, ",wtmult=%d", nfss->wtmult);
529 seq_printf(m, ",dtsize=%d", nfss->dtsize);
530 seq_printf(m, ",bsize=%d", nfss->bsize);
531 seq_printf(m, ",namelen=%d", nfss->namelen);
532
533 #ifdef CONFIG_NFS_V4
534 if (nfss->nfs_client->rpc_ops->version == 4) {
535 seq_printf(m, "\n\tnfsv4:\t");
536 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
537 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
538 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
539 }
540 #endif
541
542 /*
543 * Display security flavor in effect for this mount
544 */
545 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
546 if (auth->au_flavor)
547 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
548
549 /*
550 * Display superblock I/O counters
551 */
552 for_each_possible_cpu(cpu) {
553 struct nfs_iostats *stats;
554
555 preempt_disable();
556 stats = per_cpu_ptr(nfss->io_stats, cpu);
557
558 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
559 totals.events[i] += stats->events[i];
560 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
561 totals.bytes[i] += stats->bytes[i];
562
563 preempt_enable();
564 }
565
566 seq_printf(m, "\n\tevents:\t");
567 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
568 seq_printf(m, "%lu ", totals.events[i]);
569 seq_printf(m, "\n\tbytes:\t");
570 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
571 seq_printf(m, "%Lu ", totals.bytes[i]);
572 seq_printf(m, "\n");
573
574 rpc_print_iostats(m, nfss->client);
575
576 return 0;
577 }
578
579 /*
580 * Begin unmount by attempting to remove all automounted mountpoints we added
581 * in response to xdev traversals and referrals
582 */
583 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
584 {
585 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
586 struct rpc_clnt *rpc;
587
588 shrink_submounts(vfsmnt, &nfs_automount_list);
589
590 if (!(flags & MNT_FORCE))
591 return;
592 /* -EIO all pending I/O */
593 rpc = server->client_acl;
594 if (!IS_ERR(rpc))
595 rpc_killall_tasks(rpc);
596 rpc = server->client;
597 if (!IS_ERR(rpc))
598 rpc_killall_tasks(rpc);
599 }
600
601 /*
602 * Set the port number in an address. Be agnostic about the address family.
603 */
604 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
605 {
606 switch (sap->sa_family) {
607 case AF_INET: {
608 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
609 ap->sin_port = htons(port);
610 break;
611 }
612 case AF_INET6: {
613 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
614 ap->sin6_port = htons(port);
615 break;
616 }
617 }
618 }
619
620 /*
621 * Sanity-check a server address provided by the mount command.
622 *
623 * Address family must be initialized, and address must not be
624 * the ANY address for that family.
625 */
626 static int nfs_verify_server_address(struct sockaddr *addr)
627 {
628 switch (addr->sa_family) {
629 case AF_INET: {
630 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
631 return sa->sin_addr.s_addr != INADDR_ANY;
632 }
633 case AF_INET6: {
634 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
635 return !ipv6_addr_any(sa);
636 }
637 }
638
639 return 0;
640 }
641
642 /*
643 * Parse string addresses passed in via a mount option,
644 * and construct a sockaddr based on the result.
645 *
646 * If address parsing fails, set the sockaddr's address
647 * family to AF_UNSPEC to force nfs_verify_server_address()
648 * to punt the mount.
649 */
650 static void nfs_parse_server_address(char *value,
651 struct sockaddr *sap,
652 size_t *len)
653 {
654 if (strchr(value, ':')) {
655 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
656 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
657
658 ap->sin6_family = AF_INET6;
659 *len = sizeof(*ap);
660 if (in6_pton(value, -1, addr, '\0', NULL))
661 return;
662 } else {
663 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
664 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
665
666 ap->sin_family = AF_INET;
667 *len = sizeof(*ap);
668 if (in4_pton(value, -1, addr, '\0', NULL))
669 return;
670 }
671
672 sap->sa_family = AF_UNSPEC;
673 *len = 0;
674 }
675
676 /*
677 * Error-check and convert a string of mount options from user space into
678 * a data structure
679 */
680 static int nfs_parse_mount_options(char *raw,
681 struct nfs_parsed_mount_data *mnt)
682 {
683 char *p, *string;
684 unsigned short port = 0;
685
686 if (!raw) {
687 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
688 return 1;
689 }
690 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
691
692 while ((p = strsep(&raw, ",")) != NULL) {
693 substring_t args[MAX_OPT_ARGS];
694 int option, token;
695
696 if (!*p)
697 continue;
698
699 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
700
701 token = match_token(p, nfs_mount_option_tokens, args);
702 switch (token) {
703 case Opt_soft:
704 mnt->flags |= NFS_MOUNT_SOFT;
705 break;
706 case Opt_hard:
707 mnt->flags &= ~NFS_MOUNT_SOFT;
708 break;
709 case Opt_intr:
710 case Opt_nointr:
711 break;
712 case Opt_posix:
713 mnt->flags |= NFS_MOUNT_POSIX;
714 break;
715 case Opt_noposix:
716 mnt->flags &= ~NFS_MOUNT_POSIX;
717 break;
718 case Opt_cto:
719 mnt->flags &= ~NFS_MOUNT_NOCTO;
720 break;
721 case Opt_nocto:
722 mnt->flags |= NFS_MOUNT_NOCTO;
723 break;
724 case Opt_ac:
725 mnt->flags &= ~NFS_MOUNT_NOAC;
726 break;
727 case Opt_noac:
728 mnt->flags |= NFS_MOUNT_NOAC;
729 break;
730 case Opt_lock:
731 mnt->flags &= ~NFS_MOUNT_NONLM;
732 break;
733 case Opt_nolock:
734 mnt->flags |= NFS_MOUNT_NONLM;
735 break;
736 case Opt_v2:
737 mnt->flags &= ~NFS_MOUNT_VER3;
738 break;
739 case Opt_v3:
740 mnt->flags |= NFS_MOUNT_VER3;
741 break;
742 case Opt_udp:
743 mnt->flags &= ~NFS_MOUNT_TCP;
744 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
745 mnt->timeo = 7;
746 mnt->retrans = 5;
747 break;
748 case Opt_tcp:
749 mnt->flags |= NFS_MOUNT_TCP;
750 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
751 mnt->timeo = 600;
752 mnt->retrans = 2;
753 break;
754 case Opt_rdma:
755 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
756 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
757 mnt->timeo = 600;
758 mnt->retrans = 2;
759 break;
760 case Opt_acl:
761 mnt->flags &= ~NFS_MOUNT_NOACL;
762 break;
763 case Opt_noacl:
764 mnt->flags |= NFS_MOUNT_NOACL;
765 break;
766 case Opt_rdirplus:
767 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
768 break;
769 case Opt_nordirplus:
770 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
771 break;
772 case Opt_sharecache:
773 mnt->flags &= ~NFS_MOUNT_UNSHARED;
774 break;
775 case Opt_nosharecache:
776 mnt->flags |= NFS_MOUNT_UNSHARED;
777 break;
778
779 case Opt_port:
780 if (match_int(args, &option))
781 return 0;
782 if (option < 0 || option > 65535)
783 return 0;
784 port = option;
785 break;
786 case Opt_rsize:
787 if (match_int(args, &mnt->rsize))
788 return 0;
789 break;
790 case Opt_wsize:
791 if (match_int(args, &mnt->wsize))
792 return 0;
793 break;
794 case Opt_bsize:
795 if (match_int(args, &option))
796 return 0;
797 if (option < 0)
798 return 0;
799 mnt->bsize = option;
800 break;
801 case Opt_timeo:
802 if (match_int(args, &mnt->timeo))
803 return 0;
804 break;
805 case Opt_retrans:
806 if (match_int(args, &mnt->retrans))
807 return 0;
808 break;
809 case Opt_acregmin:
810 if (match_int(args, &mnt->acregmin))
811 return 0;
812 break;
813 case Opt_acregmax:
814 if (match_int(args, &mnt->acregmax))
815 return 0;
816 break;
817 case Opt_acdirmin:
818 if (match_int(args, &mnt->acdirmin))
819 return 0;
820 break;
821 case Opt_acdirmax:
822 if (match_int(args, &mnt->acdirmax))
823 return 0;
824 break;
825 case Opt_actimeo:
826 if (match_int(args, &option))
827 return 0;
828 if (option < 0)
829 return 0;
830 mnt->acregmin =
831 mnt->acregmax =
832 mnt->acdirmin =
833 mnt->acdirmax = option;
834 break;
835 case Opt_namelen:
836 if (match_int(args, &mnt->namlen))
837 return 0;
838 break;
839 case Opt_mountport:
840 if (match_int(args, &option))
841 return 0;
842 if (option < 0 || option > 65535)
843 return 0;
844 mnt->mount_server.port = option;
845 break;
846 case Opt_mountvers:
847 if (match_int(args, &option))
848 return 0;
849 if (option < 0)
850 return 0;
851 mnt->mount_server.version = option;
852 break;
853 case Opt_nfsvers:
854 if (match_int(args, &option))
855 return 0;
856 switch (option) {
857 case 2:
858 mnt->flags &= ~NFS_MOUNT_VER3;
859 break;
860 case 3:
861 mnt->flags |= NFS_MOUNT_VER3;
862 break;
863 default:
864 goto out_unrec_vers;
865 }
866 break;
867
868 case Opt_sec:
869 string = match_strdup(args);
870 if (string == NULL)
871 goto out_nomem;
872 token = match_token(string, nfs_secflavor_tokens, args);
873 kfree(string);
874
875 /*
876 * The flags setting is for v2/v3. The flavor_len
877 * setting is for v4. v2/v3 also need to know the
878 * difference between NULL and UNIX.
879 */
880 switch (token) {
881 case Opt_sec_none:
882 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
883 mnt->auth_flavor_len = 0;
884 mnt->auth_flavors[0] = RPC_AUTH_NULL;
885 break;
886 case Opt_sec_sys:
887 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
888 mnt->auth_flavor_len = 0;
889 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
890 break;
891 case Opt_sec_krb5:
892 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
893 mnt->auth_flavor_len = 1;
894 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
895 break;
896 case Opt_sec_krb5i:
897 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
898 mnt->auth_flavor_len = 1;
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
900 break;
901 case Opt_sec_krb5p:
902 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
903 mnt->auth_flavor_len = 1;
904 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
905 break;
906 case Opt_sec_lkey:
907 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
908 mnt->auth_flavor_len = 1;
909 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
910 break;
911 case Opt_sec_lkeyi:
912 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
913 mnt->auth_flavor_len = 1;
914 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
915 break;
916 case Opt_sec_lkeyp:
917 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
918 mnt->auth_flavor_len = 1;
919 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
920 break;
921 case Opt_sec_spkm:
922 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
923 mnt->auth_flavor_len = 1;
924 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
925 break;
926 case Opt_sec_spkmi:
927 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
928 mnt->auth_flavor_len = 1;
929 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
930 break;
931 case Opt_sec_spkmp:
932 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
933 mnt->auth_flavor_len = 1;
934 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
935 break;
936 default:
937 goto out_unrec_sec;
938 }
939 break;
940 case Opt_proto:
941 string = match_strdup(args);
942 if (string == NULL)
943 goto out_nomem;
944 token = match_token(string,
945 nfs_xprt_protocol_tokens, args);
946 kfree(string);
947
948 switch (token) {
949 case Opt_xprt_udp:
950 mnt->flags &= ~NFS_MOUNT_TCP;
951 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
952 mnt->timeo = 7;
953 mnt->retrans = 5;
954 break;
955 case Opt_xprt_tcp:
956 mnt->flags |= NFS_MOUNT_TCP;
957 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
958 mnt->timeo = 600;
959 mnt->retrans = 2;
960 break;
961 case Opt_xprt_rdma:
962 /* vector side protocols to TCP */
963 mnt->flags |= NFS_MOUNT_TCP;
964 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
965 mnt->timeo = 600;
966 mnt->retrans = 2;
967 break;
968 default:
969 goto out_unrec_xprt;
970 }
971 break;
972 case Opt_mountproto:
973 string = match_strdup(args);
974 if (string == NULL)
975 goto out_nomem;
976 token = match_token(string,
977 nfs_xprt_protocol_tokens, args);
978 kfree(string);
979
980 switch (token) {
981 case Opt_xprt_udp:
982 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
983 break;
984 case Opt_xprt_tcp:
985 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
986 break;
987 case Opt_xprt_rdma: /* not used for side protocols */
988 default:
989 goto out_unrec_xprt;
990 }
991 break;
992 case Opt_addr:
993 string = match_strdup(args);
994 if (string == NULL)
995 goto out_nomem;
996 nfs_parse_server_address(string, (struct sockaddr *)
997 &mnt->nfs_server.address,
998 &mnt->nfs_server.addrlen);
999 kfree(string);
1000 break;
1001 case Opt_clientaddr:
1002 string = match_strdup(args);
1003 if (string == NULL)
1004 goto out_nomem;
1005 kfree(mnt->client_address);
1006 mnt->client_address = string;
1007 break;
1008 case Opt_mounthost:
1009 string = match_strdup(args);
1010 if (string == NULL)
1011 goto out_nomem;
1012 kfree(mnt->mount_server.hostname);
1013 mnt->mount_server.hostname = string;
1014 break;
1015 case Opt_mountaddr:
1016 string = match_strdup(args);
1017 if (string == NULL)
1018 goto out_nomem;
1019 nfs_parse_server_address(string, (struct sockaddr *)
1020 &mnt->mount_server.address,
1021 &mnt->mount_server.addrlen);
1022 kfree(string);
1023 break;
1024
1025 case Opt_userspace:
1026 case Opt_deprecated:
1027 break;
1028
1029 default:
1030 goto out_unknown;
1031 }
1032 }
1033
1034 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address, port);
1035
1036 return 1;
1037
1038 out_nomem:
1039 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1040 return 0;
1041
1042 out_unrec_vers:
1043 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1044 return 0;
1045
1046 out_unrec_xprt:
1047 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1048 return 0;
1049
1050 out_unrec_sec:
1051 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1052 return 0;
1053
1054 out_unknown:
1055 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1056 return 0;
1057 }
1058
1059 /*
1060 * Use the remote server's MOUNT service to request the NFS file handle
1061 * corresponding to the provided path.
1062 */
1063 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1064 struct nfs_fh *root_fh)
1065 {
1066 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1067 char *hostname;
1068 int status;
1069
1070 if (args->mount_server.version == 0) {
1071 if (args->flags & NFS_MOUNT_VER3)
1072 args->mount_server.version = NFS_MNT3_VERSION;
1073 else
1074 args->mount_server.version = NFS_MNT_VERSION;
1075 }
1076
1077 if (args->mount_server.hostname)
1078 hostname = args->mount_server.hostname;
1079 else
1080 hostname = args->nfs_server.hostname;
1081
1082 /*
1083 * Construct the mount server's address.
1084 */
1085 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1086 memcpy(sap, &args->nfs_server.address,
1087 args->nfs_server.addrlen);
1088 args->mount_server.addrlen = args->nfs_server.addrlen;
1089 }
1090
1091 /*
1092 * autobind will be used if mount_server.port == 0
1093 */
1094 nfs_set_port(sap, args->mount_server.port);
1095
1096 /*
1097 * Now ask the mount server to map our export path
1098 * to a file handle.
1099 */
1100 status = nfs_mount(sap,
1101 args->mount_server.addrlen,
1102 hostname,
1103 args->nfs_server.export_path,
1104 args->mount_server.version,
1105 args->mount_server.protocol,
1106 root_fh);
1107 if (status == 0)
1108 return 0;
1109
1110 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1111 hostname, status);
1112 return status;
1113 }
1114
1115 /*
1116 * Validate the NFS2/NFS3 mount data
1117 * - fills in the mount root filehandle
1118 *
1119 * For option strings, user space handles the following behaviors:
1120 *
1121 * + DNS: mapping server host name to IP address ("addr=" option)
1122 *
1123 * + failure mode: how to behave if a mount request can't be handled
1124 * immediately ("fg/bg" option)
1125 *
1126 * + retry: how often to retry a mount request ("retry=" option)
1127 *
1128 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1129 * mountproto=tcp after mountproto=udp, and so on
1130 */
1131 static int nfs_validate_mount_data(void *options,
1132 struct nfs_parsed_mount_data *args,
1133 struct nfs_fh *mntfh,
1134 const char *dev_name)
1135 {
1136 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1137
1138 memset(args, 0, sizeof(*args));
1139
1140 if (data == NULL)
1141 goto out_no_data;
1142
1143 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1144 args->rsize = NFS_MAX_FILE_IO_SIZE;
1145 args->wsize = NFS_MAX_FILE_IO_SIZE;
1146 args->timeo = 600;
1147 args->retrans = 2;
1148 args->acregmin = 3;
1149 args->acregmax = 60;
1150 args->acdirmin = 30;
1151 args->acdirmax = 60;
1152 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1153 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1154
1155 switch (data->version) {
1156 case 1:
1157 data->namlen = 0;
1158 case 2:
1159 data->bsize = 0;
1160 case 3:
1161 if (data->flags & NFS_MOUNT_VER3)
1162 goto out_no_v3;
1163 data->root.size = NFS2_FHSIZE;
1164 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1165 case 4:
1166 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1167 goto out_no_sec;
1168 case 5:
1169 memset(data->context, 0, sizeof(data->context));
1170 case 6:
1171 if (data->flags & NFS_MOUNT_VER3)
1172 mntfh->size = data->root.size;
1173 else
1174 mntfh->size = NFS2_FHSIZE;
1175
1176 if (mntfh->size > sizeof(mntfh->data))
1177 goto out_invalid_fh;
1178
1179 memcpy(mntfh->data, data->root.data, mntfh->size);
1180 if (mntfh->size < sizeof(mntfh->data))
1181 memset(mntfh->data + mntfh->size, 0,
1182 sizeof(mntfh->data) - mntfh->size);
1183
1184 /*
1185 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1186 * can deal with.
1187 */
1188 args->flags = data->flags;
1189 args->rsize = data->rsize;
1190 args->wsize = data->wsize;
1191 args->flags = data->flags;
1192 args->timeo = data->timeo;
1193 args->retrans = data->retrans;
1194 args->acregmin = data->acregmin;
1195 args->acregmax = data->acregmax;
1196 args->acdirmin = data->acdirmin;
1197 args->acdirmax = data->acdirmax;
1198
1199 memcpy(&args->nfs_server.address, &data->addr,
1200 sizeof(data->addr));
1201 args->nfs_server.addrlen = sizeof(data->addr);
1202 if (!nfs_verify_server_address((struct sockaddr *)
1203 &args->nfs_server.address))
1204 goto out_no_address;
1205
1206 if (!(data->flags & NFS_MOUNT_TCP))
1207 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1208 /* N.B. caller will free nfs_server.hostname in all cases */
1209 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1210 args->namlen = data->namlen;
1211 args->bsize = data->bsize;
1212 args->auth_flavors[0] = data->pseudoflavor;
1213 break;
1214 default: {
1215 unsigned int len;
1216 char *c;
1217 int status;
1218
1219 if (nfs_parse_mount_options((char *)options, args) == 0)
1220 return -EINVAL;
1221
1222 if (!nfs_verify_server_address((struct sockaddr *)
1223 &args->nfs_server.address))
1224 goto out_no_address;
1225
1226 c = strchr(dev_name, ':');
1227 if (c == NULL)
1228 return -EINVAL;
1229 len = c - dev_name;
1230 /* N.B. caller will free nfs_server.hostname in all cases */
1231 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1232
1233 c++;
1234 if (strlen(c) > NFS_MAXPATHLEN)
1235 return -ENAMETOOLONG;
1236 args->nfs_server.export_path = c;
1237
1238 status = nfs_try_mount(args, mntfh);
1239 if (status)
1240 return status;
1241
1242 break;
1243 }
1244 }
1245
1246 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1247 args->auth_flavors[0] = RPC_AUTH_UNIX;
1248
1249 #ifndef CONFIG_NFS_V3
1250 if (args->flags & NFS_MOUNT_VER3)
1251 goto out_v3_not_compiled;
1252 #endif /* !CONFIG_NFS_V3 */
1253
1254 return 0;
1255
1256 out_no_data:
1257 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1258 return -EINVAL;
1259
1260 out_no_v3:
1261 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1262 data->version);
1263 return -EINVAL;
1264
1265 out_no_sec:
1266 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1267 return -EINVAL;
1268
1269 #ifndef CONFIG_NFS_V3
1270 out_v3_not_compiled:
1271 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1272 return -EPROTONOSUPPORT;
1273 #endif /* !CONFIG_NFS_V3 */
1274
1275 out_no_address:
1276 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1277 return -EINVAL;
1278
1279 out_invalid_fh:
1280 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1281 return -EINVAL;
1282 }
1283
1284 /*
1285 * Initialise the common bits of the superblock
1286 */
1287 static inline void nfs_initialise_sb(struct super_block *sb)
1288 {
1289 struct nfs_server *server = NFS_SB(sb);
1290
1291 sb->s_magic = NFS_SUPER_MAGIC;
1292
1293 /* We probably want something more informative here */
1294 snprintf(sb->s_id, sizeof(sb->s_id),
1295 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1296
1297 if (sb->s_blocksize == 0)
1298 sb->s_blocksize = nfs_block_bits(server->wsize,
1299 &sb->s_blocksize_bits);
1300
1301 if (server->flags & NFS_MOUNT_NOAC)
1302 sb->s_flags |= MS_SYNCHRONOUS;
1303
1304 nfs_super_set_maxbytes(sb, server->maxfilesize);
1305 }
1306
1307 /*
1308 * Finish setting up an NFS2/3 superblock
1309 */
1310 static void nfs_fill_super(struct super_block *sb,
1311 struct nfs_parsed_mount_data *data)
1312 {
1313 struct nfs_server *server = NFS_SB(sb);
1314
1315 sb->s_blocksize_bits = 0;
1316 sb->s_blocksize = 0;
1317 if (data->bsize)
1318 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1319
1320 if (server->flags & NFS_MOUNT_VER3) {
1321 /* The VFS shouldn't apply the umask to mode bits. We will do
1322 * so ourselves when necessary.
1323 */
1324 sb->s_flags |= MS_POSIXACL;
1325 sb->s_time_gran = 1;
1326 }
1327
1328 sb->s_op = &nfs_sops;
1329 nfs_initialise_sb(sb);
1330 }
1331
1332 /*
1333 * Finish setting up a cloned NFS2/3 superblock
1334 */
1335 static void nfs_clone_super(struct super_block *sb,
1336 const struct super_block *old_sb)
1337 {
1338 struct nfs_server *server = NFS_SB(sb);
1339
1340 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1341 sb->s_blocksize = old_sb->s_blocksize;
1342 sb->s_maxbytes = old_sb->s_maxbytes;
1343
1344 if (server->flags & NFS_MOUNT_VER3) {
1345 /* The VFS shouldn't apply the umask to mode bits. We will do
1346 * so ourselves when necessary.
1347 */
1348 sb->s_flags |= MS_POSIXACL;
1349 sb->s_time_gran = 1;
1350 }
1351
1352 sb->s_op = old_sb->s_op;
1353 nfs_initialise_sb(sb);
1354 }
1355
1356 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1357
1358 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1359 {
1360 const struct nfs_server *a = s->s_fs_info;
1361 const struct rpc_clnt *clnt_a = a->client;
1362 const struct rpc_clnt *clnt_b = b->client;
1363
1364 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1365 goto Ebusy;
1366 if (a->nfs_client != b->nfs_client)
1367 goto Ebusy;
1368 if (a->flags != b->flags)
1369 goto Ebusy;
1370 if (a->wsize != b->wsize)
1371 goto Ebusy;
1372 if (a->rsize != b->rsize)
1373 goto Ebusy;
1374 if (a->acregmin != b->acregmin)
1375 goto Ebusy;
1376 if (a->acregmax != b->acregmax)
1377 goto Ebusy;
1378 if (a->acdirmin != b->acdirmin)
1379 goto Ebusy;
1380 if (a->acdirmax != b->acdirmax)
1381 goto Ebusy;
1382 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1383 goto Ebusy;
1384 return 1;
1385 Ebusy:
1386 return 0;
1387 }
1388
1389 struct nfs_sb_mountdata {
1390 struct nfs_server *server;
1391 int mntflags;
1392 };
1393
1394 static int nfs_set_super(struct super_block *s, void *data)
1395 {
1396 struct nfs_sb_mountdata *sb_mntdata = data;
1397 struct nfs_server *server = sb_mntdata->server;
1398 int ret;
1399
1400 s->s_flags = sb_mntdata->mntflags;
1401 s->s_fs_info = server;
1402 ret = set_anon_super(s, server);
1403 if (ret == 0)
1404 server->s_dev = s->s_dev;
1405 return ret;
1406 }
1407
1408 static int nfs_compare_super_address(struct nfs_server *server1,
1409 struct nfs_server *server2)
1410 {
1411 struct sockaddr *sap1, *sap2;
1412
1413 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1414 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1415
1416 if (sap1->sa_family != sap2->sa_family)
1417 return 0;
1418
1419 switch (sap1->sa_family) {
1420 case AF_INET: {
1421 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1422 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1423 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1424 return 0;
1425 if (sin1->sin_port != sin2->sin_port)
1426 return 0;
1427 break;
1428 }
1429 case AF_INET6: {
1430 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1431 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1432 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1433 return 0;
1434 if (sin1->sin6_port != sin2->sin6_port)
1435 return 0;
1436 break;
1437 }
1438 default:
1439 return 0;
1440 }
1441
1442 return 1;
1443 }
1444
1445 static int nfs_compare_super(struct super_block *sb, void *data)
1446 {
1447 struct nfs_sb_mountdata *sb_mntdata = data;
1448 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1449 int mntflags = sb_mntdata->mntflags;
1450
1451 if (!nfs_compare_super_address(old, server))
1452 return 0;
1453 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1454 if (old->flags & NFS_MOUNT_UNSHARED)
1455 return 0;
1456 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1457 return 0;
1458 return nfs_compare_mount_options(sb, server, mntflags);
1459 }
1460
1461 static int nfs_get_sb(struct file_system_type *fs_type,
1462 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1463 {
1464 struct nfs_server *server = NULL;
1465 struct super_block *s;
1466 struct nfs_fh mntfh;
1467 struct nfs_parsed_mount_data data;
1468 struct dentry *mntroot;
1469 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1470 struct nfs_sb_mountdata sb_mntdata = {
1471 .mntflags = flags,
1472 };
1473 int error;
1474
1475 /* Validate the mount data */
1476 error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1477 if (error < 0)
1478 goto out;
1479
1480 /* Get a volume representation */
1481 server = nfs_create_server(&data, &mntfh);
1482 if (IS_ERR(server)) {
1483 error = PTR_ERR(server);
1484 goto out;
1485 }
1486 sb_mntdata.server = server;
1487
1488 if (server->flags & NFS_MOUNT_UNSHARED)
1489 compare_super = NULL;
1490
1491 /* Get a superblock - note that we may end up sharing one that already exists */
1492 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1493 if (IS_ERR(s)) {
1494 error = PTR_ERR(s);
1495 goto out_err_nosb;
1496 }
1497
1498 if (s->s_fs_info != server) {
1499 nfs_free_server(server);
1500 server = NULL;
1501 }
1502
1503 if (!s->s_root) {
1504 /* initial superblock/root creation */
1505 nfs_fill_super(s, &data);
1506 }
1507
1508 mntroot = nfs_get_root(s, &mntfh);
1509 if (IS_ERR(mntroot)) {
1510 error = PTR_ERR(mntroot);
1511 goto error_splat_super;
1512 }
1513
1514 s->s_flags |= MS_ACTIVE;
1515 mnt->mnt_sb = s;
1516 mnt->mnt_root = mntroot;
1517 error = 0;
1518
1519 out:
1520 kfree(data.nfs_server.hostname);
1521 kfree(data.mount_server.hostname);
1522 return error;
1523
1524 out_err_nosb:
1525 nfs_free_server(server);
1526 goto out;
1527
1528 error_splat_super:
1529 up_write(&s->s_umount);
1530 deactivate_super(s);
1531 goto out;
1532 }
1533
1534 /*
1535 * Destroy an NFS2/3 superblock
1536 */
1537 static void nfs_kill_super(struct super_block *s)
1538 {
1539 struct nfs_server *server = NFS_SB(s);
1540
1541 kill_anon_super(s);
1542 nfs_free_server(server);
1543 }
1544
1545 /*
1546 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1547 */
1548 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1549 const char *dev_name, void *raw_data,
1550 struct vfsmount *mnt)
1551 {
1552 struct nfs_clone_mount *data = raw_data;
1553 struct super_block *s;
1554 struct nfs_server *server;
1555 struct dentry *mntroot;
1556 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1557 struct nfs_sb_mountdata sb_mntdata = {
1558 .mntflags = flags,
1559 };
1560 int error;
1561
1562 dprintk("--> nfs_xdev_get_sb()\n");
1563
1564 /* create a new volume representation */
1565 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1566 if (IS_ERR(server)) {
1567 error = PTR_ERR(server);
1568 goto out_err_noserver;
1569 }
1570 sb_mntdata.server = server;
1571
1572 if (server->flags & NFS_MOUNT_UNSHARED)
1573 compare_super = NULL;
1574
1575 /* Get a superblock - note that we may end up sharing one that already exists */
1576 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1577 if (IS_ERR(s)) {
1578 error = PTR_ERR(s);
1579 goto out_err_nosb;
1580 }
1581
1582 if (s->s_fs_info != server) {
1583 nfs_free_server(server);
1584 server = NULL;
1585 }
1586
1587 if (!s->s_root) {
1588 /* initial superblock/root creation */
1589 nfs_clone_super(s, data->sb);
1590 }
1591
1592 mntroot = nfs_get_root(s, data->fh);
1593 if (IS_ERR(mntroot)) {
1594 error = PTR_ERR(mntroot);
1595 goto error_splat_super;
1596 }
1597 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1598 dput(mntroot);
1599 error = -ESTALE;
1600 goto error_splat_super;
1601 }
1602
1603 s->s_flags |= MS_ACTIVE;
1604 mnt->mnt_sb = s;
1605 mnt->mnt_root = mntroot;
1606
1607 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1608 return 0;
1609
1610 out_err_nosb:
1611 nfs_free_server(server);
1612 out_err_noserver:
1613 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1614 return error;
1615
1616 error_splat_super:
1617 up_write(&s->s_umount);
1618 deactivate_super(s);
1619 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1620 return error;
1621 }
1622
1623 #ifdef CONFIG_NFS_V4
1624
1625 /*
1626 * Finish setting up a cloned NFS4 superblock
1627 */
1628 static void nfs4_clone_super(struct super_block *sb,
1629 const struct super_block *old_sb)
1630 {
1631 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1632 sb->s_blocksize = old_sb->s_blocksize;
1633 sb->s_maxbytes = old_sb->s_maxbytes;
1634 sb->s_time_gran = 1;
1635 sb->s_op = old_sb->s_op;
1636 nfs_initialise_sb(sb);
1637 }
1638
1639 /*
1640 * Set up an NFS4 superblock
1641 */
1642 static void nfs4_fill_super(struct super_block *sb)
1643 {
1644 sb->s_time_gran = 1;
1645 sb->s_op = &nfs4_sops;
1646 nfs_initialise_sb(sb);
1647 }
1648
1649 /*
1650 * If the user didn't specify a port, set the port number to
1651 * the NFS version 4 default port.
1652 */
1653 static void nfs4_default_port(struct sockaddr *sap)
1654 {
1655 switch (sap->sa_family) {
1656 case AF_INET: {
1657 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
1658 if (ap->sin_port == 0)
1659 ap->sin_port = htons(NFS_PORT);
1660 break;
1661 }
1662 case AF_INET6: {
1663 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
1664 if (ap->sin6_port == 0)
1665 ap->sin6_port = htons(NFS_PORT);
1666 break;
1667 }
1668 }
1669 }
1670
1671 /*
1672 * Validate NFSv4 mount options
1673 */
1674 static int nfs4_validate_mount_data(void *options,
1675 struct nfs_parsed_mount_data *args,
1676 const char *dev_name)
1677 {
1678 struct sockaddr_in *ap;
1679 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1680 char *c;
1681
1682 memset(args, 0, sizeof(*args));
1683
1684 if (data == NULL)
1685 goto out_no_data;
1686
1687 args->rsize = NFS_MAX_FILE_IO_SIZE;
1688 args->wsize = NFS_MAX_FILE_IO_SIZE;
1689 args->timeo = 600;
1690 args->retrans = 2;
1691 args->acregmin = 3;
1692 args->acregmax = 60;
1693 args->acdirmin = 30;
1694 args->acdirmax = 60;
1695 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1696
1697 switch (data->version) {
1698 case 1:
1699 ap = (struct sockaddr_in *)&args->nfs_server.address;
1700 if (data->host_addrlen > sizeof(args->nfs_server.address))
1701 goto out_no_address;
1702 if (data->host_addrlen == 0)
1703 goto out_no_address;
1704 args->nfs_server.addrlen = data->host_addrlen;
1705 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1706 return -EFAULT;
1707 if (!nfs_verify_server_address((struct sockaddr *)
1708 &args->nfs_server.address))
1709 goto out_no_address;
1710
1711 nfs4_default_port((struct sockaddr *)
1712 &args->nfs_server.address);
1713
1714 switch (data->auth_flavourlen) {
1715 case 0:
1716 args->auth_flavors[0] = RPC_AUTH_UNIX;
1717 break;
1718 case 1:
1719 if (copy_from_user(&args->auth_flavors[0],
1720 data->auth_flavours,
1721 sizeof(args->auth_flavors[0])))
1722 return -EFAULT;
1723 break;
1724 default:
1725 goto out_inval_auth;
1726 }
1727
1728 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1729 if (IS_ERR(c))
1730 return PTR_ERR(c);
1731 args->nfs_server.hostname = c;
1732
1733 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1734 if (IS_ERR(c))
1735 return PTR_ERR(c);
1736 args->nfs_server.export_path = c;
1737 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1738
1739 c = strndup_user(data->client_addr.data, 16);
1740 if (IS_ERR(c))
1741 return PTR_ERR(c);
1742 args->client_address = c;
1743
1744 /*
1745 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1746 * can deal with.
1747 */
1748
1749 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1750 args->rsize = data->rsize;
1751 args->wsize = data->wsize;
1752 args->timeo = data->timeo;
1753 args->retrans = data->retrans;
1754 args->acregmin = data->acregmin;
1755 args->acregmax = data->acregmax;
1756 args->acdirmin = data->acdirmin;
1757 args->acdirmax = data->acdirmax;
1758 args->nfs_server.protocol = data->proto;
1759
1760 break;
1761 default: {
1762 unsigned int len;
1763
1764 if (nfs_parse_mount_options((char *)options, args) == 0)
1765 return -EINVAL;
1766
1767 if (!nfs_verify_server_address((struct sockaddr *)
1768 &args->nfs_server.address))
1769 return -EINVAL;
1770
1771 nfs4_default_port((struct sockaddr *)
1772 &args->nfs_server.address);
1773
1774 switch (args->auth_flavor_len) {
1775 case 0:
1776 args->auth_flavors[0] = RPC_AUTH_UNIX;
1777 break;
1778 case 1:
1779 break;
1780 default:
1781 goto out_inval_auth;
1782 }
1783
1784 /*
1785 * Split "dev_name" into "hostname:mntpath".
1786 */
1787 c = strchr(dev_name, ':');
1788 if (c == NULL)
1789 return -EINVAL;
1790 /* while calculating len, pretend ':' is '\0' */
1791 len = c - dev_name;
1792 if (len > NFS4_MAXNAMLEN)
1793 return -ENAMETOOLONG;
1794 /* N.B. caller will free nfs_server.hostname in all cases */
1795 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1796
1797 c++; /* step over the ':' */
1798 len = strlen(c);
1799 if (len > NFS4_MAXPATHLEN)
1800 return -ENAMETOOLONG;
1801 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1802
1803 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1804
1805 if (args->client_address == NULL)
1806 goto out_no_client_address;
1807
1808 break;
1809 }
1810 }
1811
1812 return 0;
1813
1814 out_no_data:
1815 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1816 return -EINVAL;
1817
1818 out_inval_auth:
1819 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1820 data->auth_flavourlen);
1821 return -EINVAL;
1822
1823 out_no_address:
1824 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1825 return -EINVAL;
1826
1827 out_no_client_address:
1828 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1829 return -EINVAL;
1830 }
1831
1832 /*
1833 * Get the superblock for an NFS4 mountpoint
1834 */
1835 static int nfs4_get_sb(struct file_system_type *fs_type,
1836 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1837 {
1838 struct nfs_parsed_mount_data data;
1839 struct super_block *s;
1840 struct nfs_server *server;
1841 struct nfs_fh mntfh;
1842 struct dentry *mntroot;
1843 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1844 struct nfs_sb_mountdata sb_mntdata = {
1845 .mntflags = flags,
1846 };
1847 int error;
1848
1849 /* Validate the mount data */
1850 error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1851 if (error < 0)
1852 goto out;
1853
1854 /* Get a volume representation */
1855 server = nfs4_create_server(&data, &mntfh);
1856 if (IS_ERR(server)) {
1857 error = PTR_ERR(server);
1858 goto out;
1859 }
1860 sb_mntdata.server = server;
1861
1862 if (server->flags & NFS4_MOUNT_UNSHARED)
1863 compare_super = NULL;
1864
1865 /* Get a superblock - note that we may end up sharing one that already exists */
1866 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1867 if (IS_ERR(s)) {
1868 error = PTR_ERR(s);
1869 goto out_free;
1870 }
1871
1872 if (s->s_fs_info != server) {
1873 nfs_free_server(server);
1874 server = NULL;
1875 }
1876
1877 if (!s->s_root) {
1878 /* initial superblock/root creation */
1879 nfs4_fill_super(s);
1880 }
1881
1882 mntroot = nfs4_get_root(s, &mntfh);
1883 if (IS_ERR(mntroot)) {
1884 error = PTR_ERR(mntroot);
1885 goto error_splat_super;
1886 }
1887
1888 s->s_flags |= MS_ACTIVE;
1889 mnt->mnt_sb = s;
1890 mnt->mnt_root = mntroot;
1891 error = 0;
1892
1893 out:
1894 kfree(data.client_address);
1895 kfree(data.nfs_server.export_path);
1896 kfree(data.nfs_server.hostname);
1897 return error;
1898
1899 out_free:
1900 nfs_free_server(server);
1901 goto out;
1902
1903 error_splat_super:
1904 up_write(&s->s_umount);
1905 deactivate_super(s);
1906 goto out;
1907 }
1908
1909 static void nfs4_kill_super(struct super_block *sb)
1910 {
1911 struct nfs_server *server = NFS_SB(sb);
1912
1913 nfs_return_all_delegations(sb);
1914 kill_anon_super(sb);
1915
1916 nfs4_renewd_prepare_shutdown(server);
1917 nfs_free_server(server);
1918 }
1919
1920 /*
1921 * Clone an NFS4 server record on xdev traversal (FSID-change)
1922 */
1923 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1924 const char *dev_name, void *raw_data,
1925 struct vfsmount *mnt)
1926 {
1927 struct nfs_clone_mount *data = raw_data;
1928 struct super_block *s;
1929 struct nfs_server *server;
1930 struct dentry *mntroot;
1931 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1932 struct nfs_sb_mountdata sb_mntdata = {
1933 .mntflags = flags,
1934 };
1935 int error;
1936
1937 dprintk("--> nfs4_xdev_get_sb()\n");
1938
1939 /* create a new volume representation */
1940 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1941 if (IS_ERR(server)) {
1942 error = PTR_ERR(server);
1943 goto out_err_noserver;
1944 }
1945 sb_mntdata.server = server;
1946
1947 if (server->flags & NFS4_MOUNT_UNSHARED)
1948 compare_super = NULL;
1949
1950 /* Get a superblock - note that we may end up sharing one that already exists */
1951 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1952 if (IS_ERR(s)) {
1953 error = PTR_ERR(s);
1954 goto out_err_nosb;
1955 }
1956
1957 if (s->s_fs_info != server) {
1958 nfs_free_server(server);
1959 server = NULL;
1960 }
1961
1962 if (!s->s_root) {
1963 /* initial superblock/root creation */
1964 nfs4_clone_super(s, data->sb);
1965 }
1966
1967 mntroot = nfs4_get_root(s, data->fh);
1968 if (IS_ERR(mntroot)) {
1969 error = PTR_ERR(mntroot);
1970 goto error_splat_super;
1971 }
1972 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1973 dput(mntroot);
1974 error = -ESTALE;
1975 goto error_splat_super;
1976 }
1977
1978 s->s_flags |= MS_ACTIVE;
1979 mnt->mnt_sb = s;
1980 mnt->mnt_root = mntroot;
1981
1982 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1983 return 0;
1984
1985 out_err_nosb:
1986 nfs_free_server(server);
1987 out_err_noserver:
1988 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
1989 return error;
1990
1991 error_splat_super:
1992 up_write(&s->s_umount);
1993 deactivate_super(s);
1994 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
1995 return error;
1996 }
1997
1998 /*
1999 * Create an NFS4 server record on referral traversal
2000 */
2001 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2002 const char *dev_name, void *raw_data,
2003 struct vfsmount *mnt)
2004 {
2005 struct nfs_clone_mount *data = raw_data;
2006 struct super_block *s;
2007 struct nfs_server *server;
2008 struct dentry *mntroot;
2009 struct nfs_fh mntfh;
2010 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2011 struct nfs_sb_mountdata sb_mntdata = {
2012 .mntflags = flags,
2013 };
2014 int error;
2015
2016 dprintk("--> nfs4_referral_get_sb()\n");
2017
2018 /* create a new volume representation */
2019 server = nfs4_create_referral_server(data, &mntfh);
2020 if (IS_ERR(server)) {
2021 error = PTR_ERR(server);
2022 goto out_err_noserver;
2023 }
2024 sb_mntdata.server = server;
2025
2026 if (server->flags & NFS4_MOUNT_UNSHARED)
2027 compare_super = NULL;
2028
2029 /* Get a superblock - note that we may end up sharing one that already exists */
2030 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2031 if (IS_ERR(s)) {
2032 error = PTR_ERR(s);
2033 goto out_err_nosb;
2034 }
2035
2036 if (s->s_fs_info != server) {
2037 nfs_free_server(server);
2038 server = NULL;
2039 }
2040
2041 if (!s->s_root) {
2042 /* initial superblock/root creation */
2043 nfs4_fill_super(s);
2044 }
2045
2046 mntroot = nfs4_get_root(s, &mntfh);
2047 if (IS_ERR(mntroot)) {
2048 error = PTR_ERR(mntroot);
2049 goto error_splat_super;
2050 }
2051 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2052 dput(mntroot);
2053 error = -ESTALE;
2054 goto error_splat_super;
2055 }
2056
2057 s->s_flags |= MS_ACTIVE;
2058 mnt->mnt_sb = s;
2059 mnt->mnt_root = mntroot;
2060
2061 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2062 return 0;
2063
2064 out_err_nosb:
2065 nfs_free_server(server);
2066 out_err_noserver:
2067 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2068 return error;
2069
2070 error_splat_super:
2071 up_write(&s->s_umount);
2072 deactivate_super(s);
2073 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2074 return error;
2075 }
2076
2077 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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