]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/nfs/super.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'devel'
[mirror_ubuntu-bionic-kernel.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_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 vfsmount *, int);
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", __FUNCTION__, -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 vfsmount *vfsmnt, int flags)
651 {
652 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
653 struct rpc_clnt *rpc;
654
655 if (!(flags & MNT_FORCE))
656 return;
657 /* -EIO all pending I/O */
658 rpc = server->client_acl;
659 if (!IS_ERR(rpc))
660 rpc_killall_tasks(rpc);
661 rpc = server->client;
662 if (!IS_ERR(rpc))
663 rpc_killall_tasks(rpc);
664 }
665
666 /*
667 * Set the port number in an address. Be agnostic about the address family.
668 */
669 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
670 {
671 switch (sap->sa_family) {
672 case AF_INET: {
673 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
674 ap->sin_port = htons(port);
675 break;
676 }
677 case AF_INET6: {
678 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
679 ap->sin6_port = htons(port);
680 break;
681 }
682 }
683 }
684
685 /*
686 * Sanity-check a server address provided by the mount command.
687 *
688 * Address family must be initialized, and address must not be
689 * the ANY address for that family.
690 */
691 static int nfs_verify_server_address(struct sockaddr *addr)
692 {
693 switch (addr->sa_family) {
694 case AF_INET: {
695 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
696 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
697 }
698 case AF_INET6: {
699 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
700 return !ipv6_addr_any(sa);
701 }
702 }
703
704 return 0;
705 }
706
707 /*
708 * Parse string addresses passed in via a mount option,
709 * and construct a sockaddr based on the result.
710 *
711 * If address parsing fails, set the sockaddr's address
712 * family to AF_UNSPEC to force nfs_verify_server_address()
713 * to punt the mount.
714 */
715 static void nfs_parse_server_address(char *value,
716 struct sockaddr *sap,
717 size_t *len)
718 {
719 if (strchr(value, ':')) {
720 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
721 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
722
723 ap->sin6_family = AF_INET6;
724 *len = sizeof(*ap);
725 if (in6_pton(value, -1, addr, '\0', NULL))
726 return;
727 } else {
728 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
729 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
730
731 ap->sin_family = AF_INET;
732 *len = sizeof(*ap);
733 if (in4_pton(value, -1, addr, '\0', NULL))
734 return;
735 }
736
737 sap->sa_family = AF_UNSPEC;
738 *len = 0;
739 }
740
741 /*
742 * Error-check and convert a string of mount options from user space into
743 * a data structure
744 */
745 static int nfs_parse_mount_options(char *raw,
746 struct nfs_parsed_mount_data *mnt)
747 {
748 char *p, *string, *secdata;
749 int rc;
750
751 if (!raw) {
752 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
753 return 1;
754 }
755 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
756
757 secdata = alloc_secdata();
758 if (!secdata)
759 goto out_nomem;
760
761 rc = security_sb_copy_data(raw, secdata);
762 if (rc)
763 goto out_security_failure;
764
765 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
766 if (rc)
767 goto out_security_failure;
768
769 free_secdata(secdata);
770
771 while ((p = strsep(&raw, ",")) != NULL) {
772 substring_t args[MAX_OPT_ARGS];
773 int option, token;
774
775 if (!*p)
776 continue;
777
778 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
779
780 token = match_token(p, nfs_mount_option_tokens, args);
781 switch (token) {
782 case Opt_soft:
783 mnt->flags |= NFS_MOUNT_SOFT;
784 break;
785 case Opt_hard:
786 mnt->flags &= ~NFS_MOUNT_SOFT;
787 break;
788 case Opt_intr:
789 case Opt_nointr:
790 break;
791 case Opt_posix:
792 mnt->flags |= NFS_MOUNT_POSIX;
793 break;
794 case Opt_noposix:
795 mnt->flags &= ~NFS_MOUNT_POSIX;
796 break;
797 case Opt_cto:
798 mnt->flags &= ~NFS_MOUNT_NOCTO;
799 break;
800 case Opt_nocto:
801 mnt->flags |= NFS_MOUNT_NOCTO;
802 break;
803 case Opt_ac:
804 mnt->flags &= ~NFS_MOUNT_NOAC;
805 break;
806 case Opt_noac:
807 mnt->flags |= NFS_MOUNT_NOAC;
808 break;
809 case Opt_lock:
810 mnt->flags &= ~NFS_MOUNT_NONLM;
811 break;
812 case Opt_nolock:
813 mnt->flags |= NFS_MOUNT_NONLM;
814 break;
815 case Opt_v2:
816 mnt->flags &= ~NFS_MOUNT_VER3;
817 break;
818 case Opt_v3:
819 mnt->flags |= NFS_MOUNT_VER3;
820 break;
821 case Opt_udp:
822 mnt->flags &= ~NFS_MOUNT_TCP;
823 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
824 mnt->timeo = 7;
825 mnt->retrans = 5;
826 break;
827 case Opt_tcp:
828 mnt->flags |= NFS_MOUNT_TCP;
829 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
830 mnt->timeo = 600;
831 mnt->retrans = 2;
832 break;
833 case Opt_rdma:
834 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
835 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
836 mnt->timeo = 600;
837 mnt->retrans = 2;
838 break;
839 case Opt_acl:
840 mnt->flags &= ~NFS_MOUNT_NOACL;
841 break;
842 case Opt_noacl:
843 mnt->flags |= NFS_MOUNT_NOACL;
844 break;
845 case Opt_rdirplus:
846 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
847 break;
848 case Opt_nordirplus:
849 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
850 break;
851 case Opt_sharecache:
852 mnt->flags &= ~NFS_MOUNT_UNSHARED;
853 break;
854 case Opt_nosharecache:
855 mnt->flags |= NFS_MOUNT_UNSHARED;
856 break;
857
858 case Opt_port:
859 if (match_int(args, &option))
860 return 0;
861 if (option < 0 || option > 65535)
862 return 0;
863 mnt->nfs_server.port = option;
864 break;
865 case Opt_rsize:
866 if (match_int(args, &mnt->rsize))
867 return 0;
868 break;
869 case Opt_wsize:
870 if (match_int(args, &mnt->wsize))
871 return 0;
872 break;
873 case Opt_bsize:
874 if (match_int(args, &option))
875 return 0;
876 if (option < 0)
877 return 0;
878 mnt->bsize = option;
879 break;
880 case Opt_timeo:
881 if (match_int(args, &mnt->timeo))
882 return 0;
883 break;
884 case Opt_retrans:
885 if (match_int(args, &mnt->retrans))
886 return 0;
887 break;
888 case Opt_acregmin:
889 if (match_int(args, &mnt->acregmin))
890 return 0;
891 break;
892 case Opt_acregmax:
893 if (match_int(args, &mnt->acregmax))
894 return 0;
895 break;
896 case Opt_acdirmin:
897 if (match_int(args, &mnt->acdirmin))
898 return 0;
899 break;
900 case Opt_acdirmax:
901 if (match_int(args, &mnt->acdirmax))
902 return 0;
903 break;
904 case Opt_actimeo:
905 if (match_int(args, &option))
906 return 0;
907 if (option < 0)
908 return 0;
909 mnt->acregmin =
910 mnt->acregmax =
911 mnt->acdirmin =
912 mnt->acdirmax = option;
913 break;
914 case Opt_namelen:
915 if (match_int(args, &mnt->namlen))
916 return 0;
917 break;
918 case Opt_mountport:
919 if (match_int(args, &option))
920 return 0;
921 if (option < 0 || option > 65535)
922 return 0;
923 mnt->mount_server.port = option;
924 break;
925 case Opt_mountvers:
926 if (match_int(args, &option))
927 return 0;
928 if (option < 0)
929 return 0;
930 mnt->mount_server.version = option;
931 break;
932 case Opt_nfsvers:
933 if (match_int(args, &option))
934 return 0;
935 switch (option) {
936 case 2:
937 mnt->flags &= ~NFS_MOUNT_VER3;
938 break;
939 case 3:
940 mnt->flags |= NFS_MOUNT_VER3;
941 break;
942 default:
943 goto out_unrec_vers;
944 }
945 break;
946
947 case Opt_sec:
948 string = match_strdup(args);
949 if (string == NULL)
950 goto out_nomem;
951 token = match_token(string, nfs_secflavor_tokens, args);
952 kfree(string);
953
954 /*
955 * The flags setting is for v2/v3. The flavor_len
956 * setting is for v4. v2/v3 also need to know the
957 * difference between NULL and UNIX.
958 */
959 switch (token) {
960 case Opt_sec_none:
961 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
962 mnt->auth_flavor_len = 0;
963 mnt->auth_flavors[0] = RPC_AUTH_NULL;
964 break;
965 case Opt_sec_sys:
966 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
967 mnt->auth_flavor_len = 0;
968 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
969 break;
970 case Opt_sec_krb5:
971 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
972 mnt->auth_flavor_len = 1;
973 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
974 break;
975 case Opt_sec_krb5i:
976 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
977 mnt->auth_flavor_len = 1;
978 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
979 break;
980 case Opt_sec_krb5p:
981 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
982 mnt->auth_flavor_len = 1;
983 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
984 break;
985 case Opt_sec_lkey:
986 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
987 mnt->auth_flavor_len = 1;
988 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
989 break;
990 case Opt_sec_lkeyi:
991 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
992 mnt->auth_flavor_len = 1;
993 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
994 break;
995 case Opt_sec_lkeyp:
996 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
997 mnt->auth_flavor_len = 1;
998 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
999 break;
1000 case Opt_sec_spkm:
1001 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1002 mnt->auth_flavor_len = 1;
1003 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1004 break;
1005 case Opt_sec_spkmi:
1006 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1007 mnt->auth_flavor_len = 1;
1008 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1009 break;
1010 case Opt_sec_spkmp:
1011 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1012 mnt->auth_flavor_len = 1;
1013 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1014 break;
1015 default:
1016 goto out_unrec_sec;
1017 }
1018 break;
1019 case Opt_proto:
1020 string = match_strdup(args);
1021 if (string == NULL)
1022 goto out_nomem;
1023 token = match_token(string,
1024 nfs_xprt_protocol_tokens, args);
1025 kfree(string);
1026
1027 switch (token) {
1028 case Opt_xprt_udp:
1029 mnt->flags &= ~NFS_MOUNT_TCP;
1030 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1031 mnt->timeo = 7;
1032 mnt->retrans = 5;
1033 break;
1034 case Opt_xprt_tcp:
1035 mnt->flags |= NFS_MOUNT_TCP;
1036 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1037 mnt->timeo = 600;
1038 mnt->retrans = 2;
1039 break;
1040 case Opt_xprt_rdma:
1041 /* vector side protocols to TCP */
1042 mnt->flags |= NFS_MOUNT_TCP;
1043 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1044 mnt->timeo = 600;
1045 mnt->retrans = 2;
1046 break;
1047 default:
1048 goto out_unrec_xprt;
1049 }
1050 break;
1051 case Opt_mountproto:
1052 string = match_strdup(args);
1053 if (string == NULL)
1054 goto out_nomem;
1055 token = match_token(string,
1056 nfs_xprt_protocol_tokens, args);
1057 kfree(string);
1058
1059 switch (token) {
1060 case Opt_xprt_udp:
1061 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1062 break;
1063 case Opt_xprt_tcp:
1064 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1065 break;
1066 case Opt_xprt_rdma: /* not used for side protocols */
1067 default:
1068 goto out_unrec_xprt;
1069 }
1070 break;
1071 case Opt_addr:
1072 string = match_strdup(args);
1073 if (string == NULL)
1074 goto out_nomem;
1075 nfs_parse_server_address(string, (struct sockaddr *)
1076 &mnt->nfs_server.address,
1077 &mnt->nfs_server.addrlen);
1078 kfree(string);
1079 break;
1080 case Opt_clientaddr:
1081 string = match_strdup(args);
1082 if (string == NULL)
1083 goto out_nomem;
1084 kfree(mnt->client_address);
1085 mnt->client_address = string;
1086 break;
1087 case Opt_mounthost:
1088 string = match_strdup(args);
1089 if (string == NULL)
1090 goto out_nomem;
1091 kfree(mnt->mount_server.hostname);
1092 mnt->mount_server.hostname = string;
1093 break;
1094 case Opt_mountaddr:
1095 string = match_strdup(args);
1096 if (string == NULL)
1097 goto out_nomem;
1098 nfs_parse_server_address(string, (struct sockaddr *)
1099 &mnt->mount_server.address,
1100 &mnt->mount_server.addrlen);
1101 kfree(string);
1102 break;
1103
1104 case Opt_userspace:
1105 case Opt_deprecated:
1106 break;
1107
1108 default:
1109 goto out_unknown;
1110 }
1111 }
1112
1113 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1114 mnt->nfs_server.port);
1115
1116 return 1;
1117
1118 out_nomem:
1119 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1120 return 0;
1121 out_security_failure:
1122 free_secdata(secdata);
1123 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1124 return 0;
1125 out_unrec_vers:
1126 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1127 return 0;
1128
1129 out_unrec_xprt:
1130 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1131 return 0;
1132
1133 out_unrec_sec:
1134 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1135 return 0;
1136
1137 out_unknown:
1138 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1139 return 0;
1140 }
1141
1142 /*
1143 * Use the remote server's MOUNT service to request the NFS file handle
1144 * corresponding to the provided path.
1145 */
1146 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1147 struct nfs_fh *root_fh)
1148 {
1149 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1150 char *hostname;
1151 int status;
1152
1153 if (args->mount_server.version == 0) {
1154 if (args->flags & NFS_MOUNT_VER3)
1155 args->mount_server.version = NFS_MNT3_VERSION;
1156 else
1157 args->mount_server.version = NFS_MNT_VERSION;
1158 }
1159
1160 if (args->mount_server.hostname)
1161 hostname = args->mount_server.hostname;
1162 else
1163 hostname = args->nfs_server.hostname;
1164
1165 /*
1166 * Construct the mount server's address.
1167 */
1168 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1169 memcpy(sap, &args->nfs_server.address,
1170 args->nfs_server.addrlen);
1171 args->mount_server.addrlen = args->nfs_server.addrlen;
1172 }
1173
1174 /*
1175 * autobind will be used if mount_server.port == 0
1176 */
1177 nfs_set_port(sap, args->mount_server.port);
1178
1179 /*
1180 * Now ask the mount server to map our export path
1181 * to a file handle.
1182 */
1183 status = nfs_mount(sap,
1184 args->mount_server.addrlen,
1185 hostname,
1186 args->nfs_server.export_path,
1187 args->mount_server.version,
1188 args->mount_server.protocol,
1189 root_fh);
1190 if (status == 0)
1191 return 0;
1192
1193 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1194 hostname, status);
1195 return status;
1196 }
1197
1198 /*
1199 * Validate the NFS2/NFS3 mount data
1200 * - fills in the mount root filehandle
1201 *
1202 * For option strings, user space handles the following behaviors:
1203 *
1204 * + DNS: mapping server host name to IP address ("addr=" option)
1205 *
1206 * + failure mode: how to behave if a mount request can't be handled
1207 * immediately ("fg/bg" option)
1208 *
1209 * + retry: how often to retry a mount request ("retry=" option)
1210 *
1211 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1212 * mountproto=tcp after mountproto=udp, and so on
1213 */
1214 static int nfs_validate_mount_data(void *options,
1215 struct nfs_parsed_mount_data *args,
1216 struct nfs_fh *mntfh,
1217 const char *dev_name)
1218 {
1219 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1220
1221 memset(args, 0, sizeof(*args));
1222
1223 if (data == NULL)
1224 goto out_no_data;
1225
1226 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1227 args->rsize = NFS_MAX_FILE_IO_SIZE;
1228 args->wsize = NFS_MAX_FILE_IO_SIZE;
1229 args->timeo = 600;
1230 args->retrans = 2;
1231 args->acregmin = 3;
1232 args->acregmax = 60;
1233 args->acdirmin = 30;
1234 args->acdirmax = 60;
1235 args->mount_server.port = 0; /* autobind unless user sets port */
1236 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1237 args->nfs_server.port = 0; /* autobind unless user sets port */
1238 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1239
1240 switch (data->version) {
1241 case 1:
1242 data->namlen = 0;
1243 case 2:
1244 data->bsize = 0;
1245 case 3:
1246 if (data->flags & NFS_MOUNT_VER3)
1247 goto out_no_v3;
1248 data->root.size = NFS2_FHSIZE;
1249 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1250 case 4:
1251 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1252 goto out_no_sec;
1253 case 5:
1254 memset(data->context, 0, sizeof(data->context));
1255 case 6:
1256 if (data->flags & NFS_MOUNT_VER3)
1257 mntfh->size = data->root.size;
1258 else
1259 mntfh->size = NFS2_FHSIZE;
1260
1261 if (mntfh->size > sizeof(mntfh->data))
1262 goto out_invalid_fh;
1263
1264 memcpy(mntfh->data, data->root.data, mntfh->size);
1265 if (mntfh->size < sizeof(mntfh->data))
1266 memset(mntfh->data + mntfh->size, 0,
1267 sizeof(mntfh->data) - mntfh->size);
1268
1269 /*
1270 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1271 * can deal with.
1272 */
1273 args->flags = data->flags;
1274 args->rsize = data->rsize;
1275 args->wsize = data->wsize;
1276 args->timeo = data->timeo;
1277 args->retrans = data->retrans;
1278 args->acregmin = data->acregmin;
1279 args->acregmax = data->acregmax;
1280 args->acdirmin = data->acdirmin;
1281 args->acdirmax = data->acdirmax;
1282
1283 memcpy(&args->nfs_server.address, &data->addr,
1284 sizeof(data->addr));
1285 args->nfs_server.addrlen = sizeof(data->addr);
1286 if (!nfs_verify_server_address((struct sockaddr *)
1287 &args->nfs_server.address))
1288 goto out_no_address;
1289
1290 if (!(data->flags & NFS_MOUNT_TCP))
1291 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1292 /* N.B. caller will free nfs_server.hostname in all cases */
1293 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1294 args->namlen = data->namlen;
1295 args->bsize = data->bsize;
1296 args->auth_flavors[0] = data->pseudoflavor;
1297 if (!args->nfs_server.hostname)
1298 goto out_nomem;
1299
1300 /*
1301 * The legacy version 6 binary mount data from userspace has a
1302 * field used only to transport selinux information into the
1303 * the kernel. To continue to support that functionality we
1304 * have a touch of selinux knowledge here in the NFS code. The
1305 * userspace code converted context=blah to just blah so we are
1306 * converting back to the full string selinux understands.
1307 */
1308 if (data->context[0]){
1309 #ifdef CONFIG_SECURITY_SELINUX
1310 int rc;
1311 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1312 if (!opts_str)
1313 return -ENOMEM;
1314 strcpy(opts_str, "context=");
1315 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1316 strcat(opts_str, &data->context[0]);
1317 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1318 kfree(opts_str);
1319 if (rc)
1320 return rc;
1321 #else
1322 return -EINVAL;
1323 #endif
1324 }
1325
1326 break;
1327 default: {
1328 unsigned int len;
1329 char *c;
1330 int status;
1331
1332 if (nfs_parse_mount_options((char *)options, args) == 0)
1333 return -EINVAL;
1334
1335 if (!nfs_verify_server_address((struct sockaddr *)
1336 &args->nfs_server.address))
1337 goto out_no_address;
1338
1339 c = strchr(dev_name, ':');
1340 if (c == NULL)
1341 return -EINVAL;
1342 len = c - dev_name;
1343 /* N.B. caller will free nfs_server.hostname in all cases */
1344 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1345 if (!args->nfs_server.hostname)
1346 goto out_nomem;
1347
1348 c++;
1349 if (strlen(c) > NFS_MAXPATHLEN)
1350 return -ENAMETOOLONG;
1351 args->nfs_server.export_path = c;
1352
1353 status = nfs_try_mount(args, mntfh);
1354 if (status)
1355 return status;
1356
1357 break;
1358 }
1359 }
1360
1361 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1362 args->auth_flavors[0] = RPC_AUTH_UNIX;
1363
1364 #ifndef CONFIG_NFS_V3
1365 if (args->flags & NFS_MOUNT_VER3)
1366 goto out_v3_not_compiled;
1367 #endif /* !CONFIG_NFS_V3 */
1368
1369 return 0;
1370
1371 out_no_data:
1372 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1373 return -EINVAL;
1374
1375 out_no_v3:
1376 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1377 data->version);
1378 return -EINVAL;
1379
1380 out_no_sec:
1381 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1382 return -EINVAL;
1383
1384 #ifndef CONFIG_NFS_V3
1385 out_v3_not_compiled:
1386 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1387 return -EPROTONOSUPPORT;
1388 #endif /* !CONFIG_NFS_V3 */
1389
1390 out_nomem:
1391 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1392 return -ENOMEM;
1393
1394 out_no_address:
1395 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1396 return -EINVAL;
1397
1398 out_invalid_fh:
1399 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1400 return -EINVAL;
1401 }
1402
1403 /*
1404 * Initialise the common bits of the superblock
1405 */
1406 static inline void nfs_initialise_sb(struct super_block *sb)
1407 {
1408 struct nfs_server *server = NFS_SB(sb);
1409
1410 sb->s_magic = NFS_SUPER_MAGIC;
1411
1412 /* We probably want something more informative here */
1413 snprintf(sb->s_id, sizeof(sb->s_id),
1414 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1415
1416 if (sb->s_blocksize == 0)
1417 sb->s_blocksize = nfs_block_bits(server->wsize,
1418 &sb->s_blocksize_bits);
1419
1420 if (server->flags & NFS_MOUNT_NOAC)
1421 sb->s_flags |= MS_SYNCHRONOUS;
1422
1423 nfs_super_set_maxbytes(sb, server->maxfilesize);
1424 }
1425
1426 /*
1427 * Finish setting up an NFS2/3 superblock
1428 */
1429 static void nfs_fill_super(struct super_block *sb,
1430 struct nfs_parsed_mount_data *data)
1431 {
1432 struct nfs_server *server = NFS_SB(sb);
1433
1434 sb->s_blocksize_bits = 0;
1435 sb->s_blocksize = 0;
1436 if (data->bsize)
1437 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1438
1439 if (server->flags & NFS_MOUNT_VER3) {
1440 /* The VFS shouldn't apply the umask to mode bits. We will do
1441 * so ourselves when necessary.
1442 */
1443 sb->s_flags |= MS_POSIXACL;
1444 sb->s_time_gran = 1;
1445 }
1446
1447 sb->s_op = &nfs_sops;
1448 nfs_initialise_sb(sb);
1449 }
1450
1451 /*
1452 * Finish setting up a cloned NFS2/3 superblock
1453 */
1454 static void nfs_clone_super(struct super_block *sb,
1455 const struct super_block *old_sb)
1456 {
1457 struct nfs_server *server = NFS_SB(sb);
1458
1459 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1460 sb->s_blocksize = old_sb->s_blocksize;
1461 sb->s_maxbytes = old_sb->s_maxbytes;
1462
1463 if (server->flags & NFS_MOUNT_VER3) {
1464 /* The VFS shouldn't apply the umask to mode bits. We will do
1465 * so ourselves when necessary.
1466 */
1467 sb->s_flags |= MS_POSIXACL;
1468 sb->s_time_gran = 1;
1469 }
1470
1471 sb->s_op = old_sb->s_op;
1472 nfs_initialise_sb(sb);
1473 }
1474
1475 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1476
1477 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1478 {
1479 const struct nfs_server *a = s->s_fs_info;
1480 const struct rpc_clnt *clnt_a = a->client;
1481 const struct rpc_clnt *clnt_b = b->client;
1482
1483 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1484 goto Ebusy;
1485 if (a->nfs_client != b->nfs_client)
1486 goto Ebusy;
1487 if (a->flags != b->flags)
1488 goto Ebusy;
1489 if (a->wsize != b->wsize)
1490 goto Ebusy;
1491 if (a->rsize != b->rsize)
1492 goto Ebusy;
1493 if (a->acregmin != b->acregmin)
1494 goto Ebusy;
1495 if (a->acregmax != b->acregmax)
1496 goto Ebusy;
1497 if (a->acdirmin != b->acdirmin)
1498 goto Ebusy;
1499 if (a->acdirmax != b->acdirmax)
1500 goto Ebusy;
1501 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1502 goto Ebusy;
1503 return 1;
1504 Ebusy:
1505 return 0;
1506 }
1507
1508 struct nfs_sb_mountdata {
1509 struct nfs_server *server;
1510 int mntflags;
1511 };
1512
1513 static int nfs_set_super(struct super_block *s, void *data)
1514 {
1515 struct nfs_sb_mountdata *sb_mntdata = data;
1516 struct nfs_server *server = sb_mntdata->server;
1517 int ret;
1518
1519 s->s_flags = sb_mntdata->mntflags;
1520 s->s_fs_info = server;
1521 ret = set_anon_super(s, server);
1522 if (ret == 0)
1523 server->s_dev = s->s_dev;
1524 return ret;
1525 }
1526
1527 static int nfs_compare_super_address(struct nfs_server *server1,
1528 struct nfs_server *server2)
1529 {
1530 struct sockaddr *sap1, *sap2;
1531
1532 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1533 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1534
1535 if (sap1->sa_family != sap2->sa_family)
1536 return 0;
1537
1538 switch (sap1->sa_family) {
1539 case AF_INET: {
1540 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1541 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1542 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1543 return 0;
1544 if (sin1->sin_port != sin2->sin_port)
1545 return 0;
1546 break;
1547 }
1548 case AF_INET6: {
1549 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1550 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1551 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1552 return 0;
1553 if (sin1->sin6_port != sin2->sin6_port)
1554 return 0;
1555 break;
1556 }
1557 default:
1558 return 0;
1559 }
1560
1561 return 1;
1562 }
1563
1564 static int nfs_compare_super(struct super_block *sb, void *data)
1565 {
1566 struct nfs_sb_mountdata *sb_mntdata = data;
1567 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1568 int mntflags = sb_mntdata->mntflags;
1569
1570 if (!nfs_compare_super_address(old, server))
1571 return 0;
1572 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1573 if (old->flags & NFS_MOUNT_UNSHARED)
1574 return 0;
1575 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1576 return 0;
1577 return nfs_compare_mount_options(sb, server, mntflags);
1578 }
1579
1580 static int nfs_get_sb(struct file_system_type *fs_type,
1581 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1582 {
1583 struct nfs_server *server = NULL;
1584 struct super_block *s;
1585 struct nfs_fh mntfh;
1586 struct nfs_parsed_mount_data data;
1587 struct dentry *mntroot;
1588 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1589 struct nfs_sb_mountdata sb_mntdata = {
1590 .mntflags = flags,
1591 };
1592 int error;
1593
1594 security_init_mnt_opts(&data.lsm_opts);
1595
1596 /* Validate the mount data */
1597 error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1598 if (error < 0)
1599 goto out;
1600
1601 /* Get a volume representation */
1602 server = nfs_create_server(&data, &mntfh);
1603 if (IS_ERR(server)) {
1604 error = PTR_ERR(server);
1605 goto out;
1606 }
1607 sb_mntdata.server = server;
1608
1609 if (server->flags & NFS_MOUNT_UNSHARED)
1610 compare_super = NULL;
1611
1612 /* Get a superblock - note that we may end up sharing one that already exists */
1613 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1614 if (IS_ERR(s)) {
1615 error = PTR_ERR(s);
1616 goto out_err_nosb;
1617 }
1618
1619 if (s->s_fs_info != server) {
1620 nfs_free_server(server);
1621 server = NULL;
1622 }
1623
1624 if (!s->s_root) {
1625 /* initial superblock/root creation */
1626 nfs_fill_super(s, &data);
1627 }
1628
1629 mntroot = nfs_get_root(s, &mntfh);
1630 if (IS_ERR(mntroot)) {
1631 error = PTR_ERR(mntroot);
1632 goto error_splat_super;
1633 }
1634
1635 error = security_sb_set_mnt_opts(s, &data.lsm_opts);
1636 if (error)
1637 goto error_splat_root;
1638
1639 s->s_flags |= MS_ACTIVE;
1640 mnt->mnt_sb = s;
1641 mnt->mnt_root = mntroot;
1642 error = 0;
1643
1644 out:
1645 kfree(data.nfs_server.hostname);
1646 kfree(data.mount_server.hostname);
1647 security_free_mnt_opts(&data.lsm_opts);
1648 return error;
1649
1650 out_err_nosb:
1651 nfs_free_server(server);
1652 goto out;
1653
1654 error_splat_root:
1655 dput(mntroot);
1656 error_splat_super:
1657 up_write(&s->s_umount);
1658 deactivate_super(s);
1659 goto out;
1660 }
1661
1662 /*
1663 * Destroy an NFS2/3 superblock
1664 */
1665 static void nfs_kill_super(struct super_block *s)
1666 {
1667 struct nfs_server *server = NFS_SB(s);
1668
1669 kill_anon_super(s);
1670 nfs_free_server(server);
1671 }
1672
1673 /*
1674 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1675 */
1676 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1677 const char *dev_name, void *raw_data,
1678 struct vfsmount *mnt)
1679 {
1680 struct nfs_clone_mount *data = raw_data;
1681 struct super_block *s;
1682 struct nfs_server *server;
1683 struct dentry *mntroot;
1684 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1685 struct nfs_sb_mountdata sb_mntdata = {
1686 .mntflags = flags,
1687 };
1688 int error;
1689
1690 dprintk("--> nfs_xdev_get_sb()\n");
1691
1692 /* create a new volume representation */
1693 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1694 if (IS_ERR(server)) {
1695 error = PTR_ERR(server);
1696 goto out_err_noserver;
1697 }
1698 sb_mntdata.server = server;
1699
1700 if (server->flags & NFS_MOUNT_UNSHARED)
1701 compare_super = NULL;
1702
1703 /* Get a superblock - note that we may end up sharing one that already exists */
1704 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1705 if (IS_ERR(s)) {
1706 error = PTR_ERR(s);
1707 goto out_err_nosb;
1708 }
1709
1710 if (s->s_fs_info != server) {
1711 nfs_free_server(server);
1712 server = NULL;
1713 }
1714
1715 if (!s->s_root) {
1716 /* initial superblock/root creation */
1717 nfs_clone_super(s, data->sb);
1718 }
1719
1720 mntroot = nfs_get_root(s, data->fh);
1721 if (IS_ERR(mntroot)) {
1722 error = PTR_ERR(mntroot);
1723 goto error_splat_super;
1724 }
1725 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1726 dput(mntroot);
1727 error = -ESTALE;
1728 goto error_splat_super;
1729 }
1730
1731 s->s_flags |= MS_ACTIVE;
1732 mnt->mnt_sb = s;
1733 mnt->mnt_root = mntroot;
1734
1735 /* clone any lsm security options from the parent to the new sb */
1736 security_sb_clone_mnt_opts(data->sb, s);
1737
1738 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1739 return 0;
1740
1741 out_err_nosb:
1742 nfs_free_server(server);
1743 out_err_noserver:
1744 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1745 return error;
1746
1747 error_splat_super:
1748 up_write(&s->s_umount);
1749 deactivate_super(s);
1750 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1751 return error;
1752 }
1753
1754 #ifdef CONFIG_NFS_V4
1755
1756 /*
1757 * Finish setting up a cloned NFS4 superblock
1758 */
1759 static void nfs4_clone_super(struct super_block *sb,
1760 const struct super_block *old_sb)
1761 {
1762 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1763 sb->s_blocksize = old_sb->s_blocksize;
1764 sb->s_maxbytes = old_sb->s_maxbytes;
1765 sb->s_time_gran = 1;
1766 sb->s_op = old_sb->s_op;
1767 nfs_initialise_sb(sb);
1768 }
1769
1770 /*
1771 * Set up an NFS4 superblock
1772 */
1773 static void nfs4_fill_super(struct super_block *sb)
1774 {
1775 sb->s_time_gran = 1;
1776 sb->s_op = &nfs4_sops;
1777 nfs_initialise_sb(sb);
1778 }
1779
1780 /*
1781 * Validate NFSv4 mount options
1782 */
1783 static int nfs4_validate_mount_data(void *options,
1784 struct nfs_parsed_mount_data *args,
1785 const char *dev_name)
1786 {
1787 struct sockaddr_in *ap;
1788 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1789 char *c;
1790
1791 memset(args, 0, sizeof(*args));
1792
1793 if (data == NULL)
1794 goto out_no_data;
1795
1796 args->rsize = NFS_MAX_FILE_IO_SIZE;
1797 args->wsize = NFS_MAX_FILE_IO_SIZE;
1798 args->timeo = 600;
1799 args->retrans = 2;
1800 args->acregmin = 3;
1801 args->acregmax = 60;
1802 args->acdirmin = 30;
1803 args->acdirmax = 60;
1804 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
1805 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1806
1807 switch (data->version) {
1808 case 1:
1809 ap = (struct sockaddr_in *)&args->nfs_server.address;
1810 if (data->host_addrlen > sizeof(args->nfs_server.address))
1811 goto out_no_address;
1812 if (data->host_addrlen == 0)
1813 goto out_no_address;
1814 args->nfs_server.addrlen = data->host_addrlen;
1815 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1816 return -EFAULT;
1817 if (!nfs_verify_server_address((struct sockaddr *)
1818 &args->nfs_server.address))
1819 goto out_no_address;
1820
1821 switch (data->auth_flavourlen) {
1822 case 0:
1823 args->auth_flavors[0] = RPC_AUTH_UNIX;
1824 break;
1825 case 1:
1826 if (copy_from_user(&args->auth_flavors[0],
1827 data->auth_flavours,
1828 sizeof(args->auth_flavors[0])))
1829 return -EFAULT;
1830 break;
1831 default:
1832 goto out_inval_auth;
1833 }
1834
1835 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1836 if (IS_ERR(c))
1837 return PTR_ERR(c);
1838 args->nfs_server.hostname = c;
1839
1840 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1841 if (IS_ERR(c))
1842 return PTR_ERR(c);
1843 args->nfs_server.export_path = c;
1844 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1845
1846 c = strndup_user(data->client_addr.data, 16);
1847 if (IS_ERR(c))
1848 return PTR_ERR(c);
1849 args->client_address = c;
1850
1851 /*
1852 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1853 * can deal with.
1854 */
1855
1856 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1857 args->rsize = data->rsize;
1858 args->wsize = data->wsize;
1859 args->timeo = data->timeo;
1860 args->retrans = data->retrans;
1861 args->acregmin = data->acregmin;
1862 args->acregmax = data->acregmax;
1863 args->acdirmin = data->acdirmin;
1864 args->acdirmax = data->acdirmax;
1865 args->nfs_server.protocol = data->proto;
1866
1867 break;
1868 default: {
1869 unsigned int len;
1870
1871 if (nfs_parse_mount_options((char *)options, args) == 0)
1872 return -EINVAL;
1873
1874 if (!nfs_verify_server_address((struct sockaddr *)
1875 &args->nfs_server.address))
1876 return -EINVAL;
1877
1878 switch (args->auth_flavor_len) {
1879 case 0:
1880 args->auth_flavors[0] = RPC_AUTH_UNIX;
1881 break;
1882 case 1:
1883 break;
1884 default:
1885 goto out_inval_auth;
1886 }
1887
1888 /*
1889 * Split "dev_name" into "hostname:mntpath".
1890 */
1891 c = strchr(dev_name, ':');
1892 if (c == NULL)
1893 return -EINVAL;
1894 /* while calculating len, pretend ':' is '\0' */
1895 len = c - dev_name;
1896 if (len > NFS4_MAXNAMLEN)
1897 return -ENAMETOOLONG;
1898 /* N.B. caller will free nfs_server.hostname in all cases */
1899 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1900 if (!args->nfs_server.hostname)
1901 goto out_nomem;
1902
1903 c++; /* step over the ':' */
1904 len = strlen(c);
1905 if (len > NFS4_MAXPATHLEN)
1906 return -ENAMETOOLONG;
1907 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1908 if (!args->nfs_server.export_path)
1909 goto out_nomem;
1910
1911 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1912
1913 if (args->client_address == NULL)
1914 goto out_no_client_address;
1915
1916 break;
1917 }
1918 }
1919
1920 return 0;
1921
1922 out_no_data:
1923 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1924 return -EINVAL;
1925
1926 out_inval_auth:
1927 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1928 data->auth_flavourlen);
1929 return -EINVAL;
1930
1931 out_nomem:
1932 dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
1933 return -ENOMEM;
1934
1935 out_no_address:
1936 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1937 return -EINVAL;
1938
1939 out_no_client_address:
1940 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1941 return -EINVAL;
1942 }
1943
1944 /*
1945 * Get the superblock for an NFS4 mountpoint
1946 */
1947 static int nfs4_get_sb(struct file_system_type *fs_type,
1948 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1949 {
1950 struct nfs_parsed_mount_data data;
1951 struct super_block *s;
1952 struct nfs_server *server;
1953 struct nfs_fh mntfh;
1954 struct dentry *mntroot;
1955 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1956 struct nfs_sb_mountdata sb_mntdata = {
1957 .mntflags = flags,
1958 };
1959 int error;
1960
1961 security_init_mnt_opts(&data.lsm_opts);
1962
1963 /* Validate the mount data */
1964 error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1965 if (error < 0)
1966 goto out;
1967
1968 /* Get a volume representation */
1969 server = nfs4_create_server(&data, &mntfh);
1970 if (IS_ERR(server)) {
1971 error = PTR_ERR(server);
1972 goto out;
1973 }
1974 sb_mntdata.server = server;
1975
1976 if (server->flags & NFS4_MOUNT_UNSHARED)
1977 compare_super = NULL;
1978
1979 /* Get a superblock - note that we may end up sharing one that already exists */
1980 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1981 if (IS_ERR(s)) {
1982 error = PTR_ERR(s);
1983 goto out_free;
1984 }
1985
1986 if (s->s_fs_info != server) {
1987 nfs_free_server(server);
1988 server = NULL;
1989 }
1990
1991 if (!s->s_root) {
1992 /* initial superblock/root creation */
1993 nfs4_fill_super(s);
1994 }
1995
1996 mntroot = nfs4_get_root(s, &mntfh);
1997 if (IS_ERR(mntroot)) {
1998 error = PTR_ERR(mntroot);
1999 goto error_splat_super;
2000 }
2001
2002 s->s_flags |= MS_ACTIVE;
2003 mnt->mnt_sb = s;
2004 mnt->mnt_root = mntroot;
2005 error = 0;
2006
2007 out:
2008 kfree(data.client_address);
2009 kfree(data.nfs_server.export_path);
2010 kfree(data.nfs_server.hostname);
2011 security_free_mnt_opts(&data.lsm_opts);
2012 return error;
2013
2014 out_free:
2015 nfs_free_server(server);
2016 goto out;
2017
2018 error_splat_super:
2019 up_write(&s->s_umount);
2020 deactivate_super(s);
2021 goto out;
2022 }
2023
2024 static void nfs4_kill_super(struct super_block *sb)
2025 {
2026 struct nfs_server *server = NFS_SB(sb);
2027
2028 nfs_return_all_delegations(sb);
2029 kill_anon_super(sb);
2030
2031 nfs4_renewd_prepare_shutdown(server);
2032 nfs_free_server(server);
2033 }
2034
2035 /*
2036 * Clone an NFS4 server record on xdev traversal (FSID-change)
2037 */
2038 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2039 const char *dev_name, void *raw_data,
2040 struct vfsmount *mnt)
2041 {
2042 struct nfs_clone_mount *data = raw_data;
2043 struct super_block *s;
2044 struct nfs_server *server;
2045 struct dentry *mntroot;
2046 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2047 struct nfs_sb_mountdata sb_mntdata = {
2048 .mntflags = flags,
2049 };
2050 int error;
2051
2052 dprintk("--> nfs4_xdev_get_sb()\n");
2053
2054 /* create a new volume representation */
2055 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2056 if (IS_ERR(server)) {
2057 error = PTR_ERR(server);
2058 goto out_err_noserver;
2059 }
2060 sb_mntdata.server = server;
2061
2062 if (server->flags & NFS4_MOUNT_UNSHARED)
2063 compare_super = NULL;
2064
2065 /* Get a superblock - note that we may end up sharing one that already exists */
2066 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2067 if (IS_ERR(s)) {
2068 error = PTR_ERR(s);
2069 goto out_err_nosb;
2070 }
2071
2072 if (s->s_fs_info != server) {
2073 nfs_free_server(server);
2074 server = NULL;
2075 }
2076
2077 if (!s->s_root) {
2078 /* initial superblock/root creation */
2079 nfs4_clone_super(s, data->sb);
2080 }
2081
2082 mntroot = nfs4_get_root(s, data->fh);
2083 if (IS_ERR(mntroot)) {
2084 error = PTR_ERR(mntroot);
2085 goto error_splat_super;
2086 }
2087 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2088 dput(mntroot);
2089 error = -ESTALE;
2090 goto error_splat_super;
2091 }
2092
2093 s->s_flags |= MS_ACTIVE;
2094 mnt->mnt_sb = s;
2095 mnt->mnt_root = mntroot;
2096
2097 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2098 return 0;
2099
2100 out_err_nosb:
2101 nfs_free_server(server);
2102 out_err_noserver:
2103 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2104 return error;
2105
2106 error_splat_super:
2107 up_write(&s->s_umount);
2108 deactivate_super(s);
2109 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2110 return error;
2111 }
2112
2113 /*
2114 * Create an NFS4 server record on referral traversal
2115 */
2116 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2117 const char *dev_name, void *raw_data,
2118 struct vfsmount *mnt)
2119 {
2120 struct nfs_clone_mount *data = raw_data;
2121 struct super_block *s;
2122 struct nfs_server *server;
2123 struct dentry *mntroot;
2124 struct nfs_fh mntfh;
2125 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2126 struct nfs_sb_mountdata sb_mntdata = {
2127 .mntflags = flags,
2128 };
2129 int error;
2130
2131 dprintk("--> nfs4_referral_get_sb()\n");
2132
2133 /* create a new volume representation */
2134 server = nfs4_create_referral_server(data, &mntfh);
2135 if (IS_ERR(server)) {
2136 error = PTR_ERR(server);
2137 goto out_err_noserver;
2138 }
2139 sb_mntdata.server = server;
2140
2141 if (server->flags & NFS4_MOUNT_UNSHARED)
2142 compare_super = NULL;
2143
2144 /* Get a superblock - note that we may end up sharing one that already exists */
2145 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2146 if (IS_ERR(s)) {
2147 error = PTR_ERR(s);
2148 goto out_err_nosb;
2149 }
2150
2151 if (s->s_fs_info != server) {
2152 nfs_free_server(server);
2153 server = NULL;
2154 }
2155
2156 if (!s->s_root) {
2157 /* initial superblock/root creation */
2158 nfs4_fill_super(s);
2159 }
2160
2161 mntroot = nfs4_get_root(s, &mntfh);
2162 if (IS_ERR(mntroot)) {
2163 error = PTR_ERR(mntroot);
2164 goto error_splat_super;
2165 }
2166 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2167 dput(mntroot);
2168 error = -ESTALE;
2169 goto error_splat_super;
2170 }
2171
2172 s->s_flags |= MS_ACTIVE;
2173 mnt->mnt_sb = s;
2174 mnt->mnt_root = mntroot;
2175
2176 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2177 return 0;
2178
2179 out_err_nosb:
2180 nfs_free_server(server);
2181 out_err_noserver:
2182 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2183 return error;
2184
2185 error_splat_super:
2186 up_write(&s->s_umount);
2187 deactivate_super(s);
2188 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2189 return error;
2190 }
2191
2192 #endif /* CONFIG_NFS_V4 */
ubuntu-bionic-kernel mirror