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NFS: Reduce the stack footprint of nfs_follow_remote_path()
[net-next-2.6.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 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 *
54ceac45
DH		 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())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 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>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 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>
c02d7adf
TM		 45#include <linux/mnt_namespace.h>
46#include <linux/namei.h>
f7b422b1
DH		 47#include <linux/nfs_idmap.h>
48#include <linux/vfs.h>
49#include <linux/inet.h>
fd00a8ff 50#include <linux/in6.h>
5a0e3ad6 51#include <linux/slab.h>
fd00a8ff 52#include <net/ipv6.h>
d8e7748a 53#include <linux/netdevice.h>
f7b422b1 54#include <linux/nfs_xdr.h>
b5d5dfbd 55#include <linux/magic.h>
bf0fd768 56#include <linux/parser.h>
f7b422b1
DH		 57
58#include <asm/system.h>
59#include <asm/uaccess.h>
60
61#include "nfs4_fs.h"
62#include "callback.h"
63#include "delegation.h"
64#include "iostat.h"
65#include "internal.h"
08734048 66#include "fscache.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
69
bf0fd768
CL		 70enum {
71 /* Mount options that take no arguments */
72 Opt_soft, Opt_hard,
bf0fd768
CL		 73 Opt_posix, Opt_noposix,
74 Opt_cto, Opt_nocto,
75 Opt_ac, Opt_noac,
76 Opt_lock, Opt_nolock,
764302cc 77 Opt_v2, Opt_v3, Opt_v4,
2cf7ff7a 78 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 79 Opt_acl, Opt_noacl,
80 Opt_rdirplus, Opt_nordirplus,
75180df2 81 Opt_sharecache, Opt_nosharecache,
d740351b 82 Opt_resvport, Opt_noresvport,
b797cac7 83 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 84
85 /* Mount options that take integer arguments */
86 Opt_port,
87 Opt_rsize, Opt_wsize, Opt_bsize,
88 Opt_timeo, Opt_retrans,
89 Opt_acregmin, Opt_acregmax,
90 Opt_acdirmin, Opt_acdirmax,
91 Opt_actimeo,
92 Opt_namelen,
93 Opt_mountport,
e887cbcf 94 Opt_mountvers,
ad879cef 95 Opt_nfsvers,
3fd5be9e 96 Opt_minorversion,
bf0fd768
CL		 97
98 /* Mount options that take string arguments */
33832034 99 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 100 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 101 Opt_lookupcache,
b797cac7 102 Opt_fscache_uniq,
bf0fd768 103
f45663ce
CL		 104 /* Special mount options */
105 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 106
107 Opt_err
108};
109
a447c093 110static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 111 { Opt_userspace, "bg" },
112 { Opt_userspace, "fg" },
ecbb3845
CL		 113 { Opt_userspace, "retry=%s" },
114
f45663ce
CL		 115 { Opt_sloppy, "sloppy" },
116
bf0fd768
CL		 117 { Opt_soft, "soft" },
118 { Opt_hard, "hard" },
d33e4dfe
CL		 119 { Opt_deprecated, "intr" },
120 { Opt_deprecated, "nointr" },
bf0fd768
CL		 121 { Opt_posix, "posix" },
122 { Opt_noposix, "noposix" },
123 { Opt_cto, "cto" },
124 { Opt_nocto, "nocto" },
125 { Opt_ac, "ac" },
126 { Opt_noac, "noac" },
127 { Opt_lock, "lock" },
128 { Opt_nolock, "nolock" },
129 { Opt_v2, "v2" },
130 { Opt_v3, "v3" },
764302cc 131 { Opt_v4, "v4" },
bf0fd768
CL		 132 { Opt_udp, "udp" },
133 { Opt_tcp, "tcp" },
2cf7ff7a 134 { Opt_rdma, "rdma" },
bf0fd768
CL		 135 { Opt_acl, "acl" },
136 { Opt_noacl, "noacl" },
137 { Opt_rdirplus, "rdirplus" },
138 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 139 { Opt_sharecache, "sharecache" },
140 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 141 { Opt_resvport, "resvport" },
142 { Opt_noresvport, "noresvport" },
b797cac7
DH		 143 { Opt_fscache, "fsc" },
144 { Opt_fscache_uniq, "fsc=%s" },
145 { Opt_nofscache, "nofsc" },
bf0fd768 146
a5a16bae
CL		 147 { Opt_port, "port=%s" },
148 { Opt_rsize, "rsize=%s" },
149 { Opt_wsize, "wsize=%s" },
150 { Opt_bsize, "bsize=%s" },
151 { Opt_timeo, "timeo=%s" },
152 { Opt_retrans, "retrans=%s" },
153 { Opt_acregmin, "acregmin=%s" },
154 { Opt_acregmax, "acregmax=%s" },
155 { Opt_acdirmin, "acdirmin=%s" },
156 { Opt_acdirmax, "acdirmax=%s" },
157 { Opt_actimeo, "actimeo=%s" },
158 { Opt_namelen, "namlen=%s" },
159 { Opt_mountport, "mountport=%s" },
160 { Opt_mountvers, "mountvers=%s" },
161 { Opt_nfsvers, "nfsvers=%s" },
162 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 163 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 164
165 { Opt_sec, "sec=%s" },
166 { Opt_proto, "proto=%s" },
167 { Opt_mountproto, "mountproto=%s" },
168 { Opt_addr, "addr=%s" },
169 { Opt_clientaddr, "clientaddr=%s" },
33832034 170 { Opt_mounthost, "mounthost=%s" },
0ac83779 171 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 172
7973c1f1
TM		 173 { Opt_lookupcache, "lookupcache=%s" },
174
bf0fd768
CL		 175 { Opt_err, NULL }
176};
177
178enum {
ee671b01 179 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 180
181 Opt_xprt_err
182};
183
a447c093 184static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 185 { Opt_xprt_udp, "udp" },
ee671b01 186 { Opt_xprt_udp6, "udp6" },
bf0fd768 187 { Opt_xprt_tcp, "tcp" },
ee671b01 188 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 189 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 190
191 { Opt_xprt_err, NULL }
192};
193
194enum {
195 Opt_sec_none, Opt_sec_sys,
196 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
197 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
198 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
199
200 Opt_sec_err
201};
202
a447c093 203static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 204 { Opt_sec_none, "none" },
205 { Opt_sec_none, "null" },
206 { Opt_sec_sys, "sys" },
207
208 { Opt_sec_krb5, "krb5" },
209 { Opt_sec_krb5i, "krb5i" },
210 { Opt_sec_krb5p, "krb5p" },
211
212 { Opt_sec_lkey, "lkey" },
213 { Opt_sec_lkeyi, "lkeyi" },
214 { Opt_sec_lkeyp, "lkeyp" },
215
8d042218
OK		 216 { Opt_sec_spkm, "spkm3" },
217 { Opt_sec_spkmi, "spkm3i" },
218 { Opt_sec_spkmp, "spkm3p" },
219
bf0fd768
CL		 220 { Opt_sec_err, NULL }
221};
222
7973c1f1
TM		 223enum {
224 Opt_lookupcache_all, Opt_lookupcache_positive,
225 Opt_lookupcache_none,
226
227 Opt_lookupcache_err
228};
229
230static match_table_t nfs_lookupcache_tokens = {
231 { Opt_lookupcache_all, "all" },
232 { Opt_lookupcache_positive, "pos" },
233 { Opt_lookupcache_positive, "positive" },
234 { Opt_lookupcache_none, "none" },
235
236 { Opt_lookupcache_err, NULL }
237};
238
bf0fd768 239
42faad99 240static void nfs_umount_begin(struct super_block *);
816724e6 241static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 242static int nfs_show_options(struct seq_file *, struct vfsmount *);
243static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 244static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 245static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
387c149b 247static void nfs_put_super(struct super_block *);
f7b422b1 248static void nfs_kill_super(struct super_block *);
48b605f8 249static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 250
251static struct file_system_type nfs_fs_type = {
252 .owner = THIS_MODULE,
253 .name = "nfs",
254 .get_sb = nfs_get_sb,
255 .kill_sb = nfs_kill_super,
349457cc 256 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 257};
258
54ceac45 259struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 260 .owner = THIS_MODULE,
261 .name = "nfs",
54ceac45 262 .get_sb = nfs_xdev_get_sb,
f7b422b1 263 .kill_sb = nfs_kill_super,
349457cc 264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 265};
266
ee9b6d61 267static const struct super_operations nfs_sops = {
f7b422b1
DH		 268 .alloc_inode = nfs_alloc_inode,
269 .destroy_inode = nfs_destroy_inode,
270 .write_inode = nfs_write_inode,
387c149b 271 .put_super = nfs_put_super,
f7b422b1
DH		 272 .statfs = nfs_statfs,
273 .clear_inode = nfs_clear_inode,
274 .umount_begin = nfs_umount_begin,
275 .show_options = nfs_show_options,
276 .show_stats = nfs_show_stats,
48b605f8 277 .remount_fs = nfs_remount,
f7b422b1
DH		 278};
279
280#ifdef CONFIG_NFS_V4
7630c852
CL		 281static int nfs4_validate_text_mount_data(void *options,
282 struct nfs_parsed_mount_data *args, const char *dev_name);
a6fe23be
CL		 283static int nfs4_try_mount(int flags, const char *dev_name,
284 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
816724e6
TM		 285static int nfs4_get_sb(struct file_system_type *fs_type,
286 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 287static int nfs4_remote_get_sb(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 289static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
290 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
291static int nfs4_referral_get_sb(struct file_system_type *fs_type,
292 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
c02d7adf
TM		 293static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
294 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 295static void nfs4_kill_super(struct super_block *sb);
296
297static struct file_system_type nfs4_fs_type = {
298 .owner = THIS_MODULE,
299 .name = "nfs4",
300 .get_sb = nfs4_get_sb,
301 .kill_sb = nfs4_kill_super,
349457cc 302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 303};
304
c02d7adf
TM		 305static struct file_system_type nfs4_remote_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs4",
308 .get_sb = nfs4_remote_get_sb,
309 .kill_sb = nfs4_kill_super,
310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
311};
312
54ceac45 313struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 314 .owner = THIS_MODULE,
315 .name = "nfs4",
54ceac45 316 .get_sb = nfs4_xdev_get_sb,
f7b422b1 317 .kill_sb = nfs4_kill_super,
349457cc 318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 319};
320
c02d7adf
TM		 321static struct file_system_type nfs4_remote_referral_fs_type = {
322 .owner = THIS_MODULE,
323 .name = "nfs4",
324 .get_sb = nfs4_remote_referral_get_sb,
325 .kill_sb = nfs4_kill_super,
326 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
327};
328
54ceac45 329struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 330 .owner = THIS_MODULE,
331 .name = "nfs4",
54ceac45 332 .get_sb = nfs4_referral_get_sb,
f7b422b1 333 .kill_sb = nfs4_kill_super,
349457cc 334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 335};
336
ee9b6d61 337static const struct super_operations nfs4_sops = {
f7b422b1
DH		 338 .alloc_inode = nfs_alloc_inode,
339 .destroy_inode = nfs_destroy_inode,
340 .write_inode = nfs_write_inode,
387c149b 341 .put_super = nfs_put_super,
f7b422b1
DH		 342 .statfs = nfs_statfs,
343 .clear_inode = nfs4_clear_inode,
344 .umount_begin = nfs_umount_begin,
345 .show_options = nfs_show_options,
346 .show_stats = nfs_show_stats,
48b605f8 347 .remount_fs = nfs_remount,
f7b422b1
DH		 348};
349#endif
350
8e1f936b
RR		 351static struct shrinker acl_shrinker = {
352 .shrink = nfs_access_cache_shrinker,
353 .seeks = DEFAULT_SEEKS,
354};
979df72e 355
f7b422b1
DH		 356/*
357 * Register the NFS filesystems
358 */
359int __init register_nfs_fs(void)
360{
361 int ret;
362
363 ret = register_filesystem(&nfs_fs_type);
364 if (ret < 0)
365 goto error_0;
366
f7b422b1
DH		 367 ret = nfs_register_sysctl();
368 if (ret < 0)
369 goto error_1;
89a09141 370#ifdef CONFIG_NFS_V4
f7b422b1
DH		 371 ret = register_filesystem(&nfs4_fs_type);
372 if (ret < 0)
373 goto error_2;
374#endif
8e1f936b 375 register_shrinker(&acl_shrinker);
f7b422b1
DH		 376 return 0;
377
378#ifdef CONFIG_NFS_V4
379error_2:
380 nfs_unregister_sysctl();
89a09141 381#endif
f7b422b1
DH		 382error_1:
383 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 384error_0:
385 return ret;
386}
387
388/*
389 * Unregister the NFS filesystems
390 */
391void __exit unregister_nfs_fs(void)
392{
8e1f936b 393 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 394#ifdef CONFIG_NFS_V4
395 unregister_filesystem(&nfs4_fs_type);
f7b422b1 396#endif
49af7ee1 397 nfs_unregister_sysctl();
f7b422b1
DH		 398 unregister_filesystem(&nfs_fs_type);
399}
400
1daef0a8 401void nfs_sb_active(struct super_block *sb)
ef818a28 402{
1daef0a8 403 struct nfs_server *server = NFS_SB(sb);
ef818a28 404
1daef0a8
TM		 405 if (atomic_inc_return(&server->active) == 1)
406 atomic_inc(&sb->s_active);
ef818a28
SD		 407}
408
1daef0a8 409void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 410{
411 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 412
413 if (atomic_dec_and_test(&server->active))
414 deactivate_super(sb);
ef818a28
SD		 415}
416
f7b422b1
DH		 417/*
418 * Deliver file system statistics to userspace
419 */
816724e6 420static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 421{
0c7d90cf 422 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 423 unsigned char blockbits;
424 unsigned long blockres;
0c7d90cf 425 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 426 struct nfs_fattr fattr;
427 struct nfs_fsstat res = {
428 .fattr = &fattr,
429 };
430 int error;
431
8fa5c000 432 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 433 if (error < 0)
434 goto out_err;
1a0ba9ae 435 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 436
437 /*
438 * Current versions of glibc do not correctly handle the
439 * case where f_frsize != f_bsize. Eventually we want to
440 * report the value of wtmult in this field.
441 */
0c7d90cf 442 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 443
444 /*
445 * On most *nix systems, f_blocks, f_bfree, and f_bavail
446 * are reported in units of f_frsize. Linux hasn't had
447 * an f_frsize field in its statfs struct until recently,
448 * thus historically Linux's sys_statfs reports these
449 * fields in units of f_bsize.
450 */
0c7d90cf
DH		 451 buf->f_bsize = dentry->d_sb->s_blocksize;
452 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 453 blockres = (1 << blockbits) - 1;
454 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
455 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
456 buf->f_bavail = (res.abytes + blockres) >> blockbits;
457
458 buf->f_files = res.tfiles;
459 buf->f_ffree = res.afiles;
460
461 buf->f_namelen = server->namelen;
1a0ba9ae 462
f7b422b1
DH		 463 return 0;
464
465 out_err:
3110ff80 466 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 467 return error;
f7b422b1
DH		 468}
469
7d4e2747
DH		 470/*
471 * Map the security flavour number to a name
472 */
81039f1f
TM		 473static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
474{
7d4e2747 475 static const struct {
81039f1f
TM		 476 rpc_authflavor_t flavour;
477 const char *str;
478 } sec_flavours[] = {
479 { RPC_AUTH_NULL, "null" },
480 { RPC_AUTH_UNIX, "sys" },
481 { RPC_AUTH_GSS_KRB5, "krb5" },
482 { RPC_AUTH_GSS_KRB5I, "krb5i" },
483 { RPC_AUTH_GSS_KRB5P, "krb5p" },
484 { RPC_AUTH_GSS_LKEY, "lkey" },
485 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
486 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
487 { RPC_AUTH_GSS_SPKM, "spkm" },
488 { RPC_AUTH_GSS_SPKMI, "spkmi" },
489 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 490 { UINT_MAX, "unknown" }
81039f1f
TM		 491 };
492 int i;
493
4d81cd16 494 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 495 if (sec_flavours[i].flavour == flavour)
496 break;
497 }
498 return sec_flavours[i].str;
499}
500
ee671b01
JL		 501static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
502 int showdefaults)
503{
504 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
505
506 seq_printf(m, ",mountproto=");
507 switch (sap->sa_family) {
508 case AF_INET:
509 switch (nfss->mountd_protocol) {
510 case IPPROTO_UDP:
511 seq_printf(m, RPCBIND_NETID_UDP);
512 break;
513 case IPPROTO_TCP:
514 seq_printf(m, RPCBIND_NETID_TCP);
515 break;
516 default:
517 if (showdefaults)
518 seq_printf(m, "auto");
519 }
520 break;
521 case AF_INET6:
522 switch (nfss->mountd_protocol) {
523 case IPPROTO_UDP:
524 seq_printf(m, RPCBIND_NETID_UDP6);
525 break;
526 case IPPROTO_TCP:
527 seq_printf(m, RPCBIND_NETID_TCP6);
528 break;
529 default:
530 if (showdefaults)
531 seq_printf(m, "auto");
532 }
533 break;
534 default:
535 if (showdefaults)
536 seq_printf(m, "auto");
537 }
538}
539
82d101d5
CL		 540static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
541 int showdefaults)
542{
543 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
544
545 switch (sap->sa_family) {
546 case AF_INET: {
547 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 548 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 549 break;
550 }
551 case AF_INET6: {
552 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 553 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 554 break;
555 }
556 default:
557 if (showdefaults)
558 seq_printf(m, ",mountaddr=unspecified");
559 }
560
561 if (nfss->mountd_version || showdefaults)
562 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
563 if (nfss->mountd_port || showdefaults)
564 seq_printf(m, ",mountport=%u", nfss->mountd_port);
565
ee671b01 566 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 567}
568
f7b422b1
DH		 569/*
570 * Describe the mount options in force on this server representation
571 */
82d101d5
CL		 572static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
573 int showdefaults)
f7b422b1 574{
509de811 575 static const struct proc_nfs_info {
f7b422b1 576 int flag;
509de811
DH		 577 const char *str;
578 const char *nostr;
f7b422b1
DH		 579 } nfs_info[] = {
580 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 581 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 582 { NFS_MOUNT_NOCTO, ",nocto", "" },
583 { NFS_MOUNT_NOAC, ",noac", "" },
584 { NFS_MOUNT_NONLM, ",nolock", "" },
585 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 586 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 587 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
588 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 589 { 0, NULL, NULL }
590 };
509de811 591 const struct proc_nfs_info *nfs_infop;
8fa5c000 592 struct nfs_client *clp = nfss->nfs_client;
82d101d5 593 u32 version = clp->rpc_ops->version;
f7b422b1 594
82d101d5 595 seq_printf(m, ",vers=%u", version);
2d767432
CL		 596 seq_printf(m, ",rsize=%u", nfss->rsize);
597 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 598 if (nfss->bsize != 0)
599 seq_printf(m, ",bsize=%u", nfss->bsize);
600 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 601 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 602 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 603 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 604 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 605 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 606 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 607 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 608 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 609 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
610 if (nfss->flags & nfs_infop->flag)
611 seq_puts(m, nfs_infop->str);
612 else
613 seq_puts(m, nfs_infop->nostr);
614 }
56928edd 615 seq_printf(m, ",proto=%s",
ee671b01 616 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 617 if (version == 4) {
618 if (nfss->port != NFS_PORT)
619 seq_printf(m, ",port=%u", nfss->port);
620 } else
621 if (nfss->port)
622 seq_printf(m, ",port=%u", nfss->port);
623
33170233
TM		 624 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
625 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 626 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 627
628 if (version != 4)
629 nfs_show_mountd_options(m, nfss, showdefaults);
630
631#ifdef CONFIG_NFS_V4
632 if (clp->rpc_ops->version == 4)
633 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
634#endif
b797cac7
DH		 635 if (nfss->options & NFS_OPTION_FSCACHE)
636 seq_printf(m, ",fsc");
f7b422b1
DH		 637}
638
639/*
640 * Describe the mount options on this VFS mountpoint
641 */
642static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
643{
644 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
645
646 nfs_show_mount_options(m, nfss, 0);
647
5d8515ca
CL		 648 seq_printf(m, ",addr=%s",
649 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
650 RPC_DISPLAY_ADDR));
f7b422b1
DH		 651
652 return 0;
653}
654
655/*
656 * Present statistical information for this VFS mountpoint
657 */
658static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
659{
660 int i, cpu;
661 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
662 struct rpc_auth *auth = nfss->client->cl_auth;
663 struct nfs_iostats totals = { };
664
665 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
666
667 /*
668 * Display all mount option settings
669 */
670 seq_printf(m, "\n\topts:\t");
671 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
672 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
673 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
674 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
675 nfs_show_mount_options(m, nfss, 1);
676
677 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
678
679 seq_printf(m, "\n\tcaps:\t");
680 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 681 seq_printf(m, ",wtmult=%u", nfss->wtmult);
682 seq_printf(m, ",dtsize=%u", nfss->dtsize);
683 seq_printf(m, ",bsize=%u", nfss->bsize);
684 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 685
686#ifdef CONFIG_NFS_V4
40c55319 687 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 688 seq_printf(m, "\n\tnfsv4:\t");
689 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
690 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
691 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
692 }
693#endif
694
695 /*
696 * Display security flavor in effect for this mount
697 */
2d767432 698 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 699 if (auth->au_flavor)
2d767432 700 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 701
702 /*
703 * Display superblock I/O counters
704 */
705 for_each_possible_cpu(cpu) {
706 struct nfs_iostats *stats;
707
708 preempt_disable();
709 stats = per_cpu_ptr(nfss->io_stats, cpu);
710
711 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
712 totals.events[i] += stats->events[i];
713 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
714 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 715#ifdef CONFIG_NFS_FSCACHE
716 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
717 totals.fscache[i] += stats->fscache[i];
718#endif
f7b422b1
DH		 719
720 preempt_enable();
721 }
722
723 seq_printf(m, "\n\tevents:\t");
724 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
725 seq_printf(m, "%lu ", totals.events[i]);
726 seq_printf(m, "\n\tbytes:\t");
727 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
728 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 729#ifdef CONFIG_NFS_FSCACHE
730 if (nfss->options & NFS_OPTION_FSCACHE) {
731 seq_printf(m, "\n\tfsc:\t");
732 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
733 seq_printf(m, "%Lu ", totals.bytes[i]);
734 }
735#endif
f7b422b1
DH		 736 seq_printf(m, "\n");
737
738 rpc_print_iostats(m, nfss->client);
739
740 return 0;
741}
742
743/*
744 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 745 * in response to xdev traversals and referrals
f7b422b1 746 */
42faad99 747static void nfs_umount_begin(struct super_block *sb)
f7b422b1 748{
67e55205 749 struct nfs_server *server;
fc6ae3cf
TM		 750 struct rpc_clnt *rpc;
751
67e55205 752 server = NFS_SB(sb);
fc6ae3cf
TM		 753 /* -EIO all pending I/O */
754 rpc = server->client_acl;
755 if (!IS_ERR(rpc))
756 rpc_killall_tasks(rpc);
757 rpc = server->client;
758 if (!IS_ERR(rpc))
759 rpc_killall_tasks(rpc);
f7b422b1
DH		 760}
761
c5811dbd 762static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 763{
764 struct nfs_parsed_mount_data *data;
765
766 data = kzalloc(sizeof(*data), GFP_KERNEL);
767 if (data) {
9423a08a
CL		 768 data->acregmin = NFS_DEF_ACREGMIN;
769 data->acregmax = NFS_DEF_ACREGMAX;
770 data->acdirmin = NFS_DEF_ACDIRMIN;
771 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 772 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 773 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 774 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 775 data->auth_flavors[0] = RPC_AUTH_UNIX;
776 data->auth_flavor_len = 1;
c5811dbd 777 data->version = version;
9423a08a
CL		 778 data->minorversion = 0;
779 }
780 return data;
781}
782
fc50d58f 783/*
cdcd7f9a
CL		 784 * Sanity-check a server address provided by the mount command.
785 *
786 * Address family must be initialized, and address must not be
787 * the ANY address for that family.
fc50d58f
CL		 788 */
789static int nfs_verify_server_address(struct sockaddr *addr)
790{
791 switch (addr->sa_family) {
792 case AF_INET: {
cdcd7f9a 793 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 794 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 795 }
796 case AF_INET6: {
797 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
798 return !ipv6_addr_any(sa);
fc50d58f
CL		 799 }
800 }
801
53a0b9c4 802 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 803 return 0;
804}
805
4cfd74fc
CL		 806/*
807 * Select between a default port value and a user-specified port value.
808 * If a zero value is set, then autobind will be used.
809 */
f5855fec 810static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 811 const unsigned short default_port)
812{
f5855fec
TM		 813 if (*port == NFS_UNSPEC_PORT)
814 *port = default_port;
4cfd74fc 815
f5855fec 816 rpc_set_port(sap, *port);
4cfd74fc
CL		 817}
818
259875ef
TM		 819/*
820 * Sanity check the NFS transport protocol.
821 *
822 */
823static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
824{
825 switch (mnt->nfs_server.protocol) {
826 case XPRT_TRANSPORT_UDP:
827 case XPRT_TRANSPORT_TCP:
828 case XPRT_TRANSPORT_RDMA:
829 break;
830 default:
831 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
832 }
833}
834
835/*
836 * For text based NFSv2/v3 mounts, the mount protocol transport default
837 * settings should depend upon the specified NFS transport.
838 */
839static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
840{
841 nfs_validate_transport_protocol(mnt);
842
843 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
844 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
845 return;
846 switch (mnt->nfs_server.protocol) {
847 case XPRT_TRANSPORT_UDP:
848 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
849 break;
850 case XPRT_TRANSPORT_TCP:
851 case XPRT_TRANSPORT_RDMA:
852 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
853 }
854}
855
01060c89
CL		 856/*
857 * Parse the value of the 'sec=' option.
01060c89
CL		 858 */
859static int nfs_parse_security_flavors(char *value,
860 struct nfs_parsed_mount_data *mnt)
861{
862 substring_t args[MAX_OPT_ARGS];
863
864 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
865
866 switch (match_token(value, nfs_secflavor_tokens, args)) {
867 case Opt_sec_none:
01060c89
CL		 868 mnt->auth_flavors[0] = RPC_AUTH_NULL;
869 break;
870 case Opt_sec_sys:
01060c89
CL		 871 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
872 break;
873 case Opt_sec_krb5:
01060c89
CL		 874 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
875 break;
876 case Opt_sec_krb5i:
01060c89
CL		 877 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
878 break;
879 case Opt_sec_krb5p:
01060c89
CL		 880 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
881 break;
882 case Opt_sec_lkey:
01060c89
CL		 883 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
884 break;
885 case Opt_sec_lkeyi:
01060c89
CL		 886 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
887 break;
888 case Opt_sec_lkeyp:
01060c89
CL		 889 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
890 break;
891 case Opt_sec_spkm:
01060c89
CL		 892 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
893 break;
894 case Opt_sec_spkmi:
01060c89
CL		 895 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
896 break;
897 case Opt_sec_spkmp:
01060c89
CL		 898 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
899 break;
900 default:
901 return 0;
902 }
903
059f90b3 904 mnt->auth_flavor_len = 1;
01060c89
CL		 905 return 1;
906}
907
bf0fd768
CL		 908/*
909 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 910 * a data structure. The whole mount string is processed; bad options are
911 * skipped as they are encountered. If there were no errors, return 1;
912 * otherwise return 0 (zero).
bf0fd768
CL		 913 */
914static int nfs_parse_mount_options(char *raw,
915 struct nfs_parsed_mount_data *mnt)
916{
f9c3a380 917 char *p, *string, *secdata;
d23c45fd 918 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 919 unsigned short protofamily = AF_UNSPEC;
920 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 921
922 if (!raw) {
923 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
924 return 1;
925 }
926 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
927
f9c3a380
EP		 928 secdata = alloc_secdata();
929 if (!secdata)
930 goto out_nomem;
931
932 rc = security_sb_copy_data(raw, secdata);
933 if (rc)
934 goto out_security_failure;
935
936 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
937 if (rc)
938 goto out_security_failure;
939
940 free_secdata(secdata);
941
bf0fd768
CL		 942 while ((p = strsep(&raw, ",")) != NULL) {
943 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 944 unsigned long option;
945 int token;
bf0fd768
CL		 946
947 if (!*p)
948 continue;
949
950 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
951
952 token = match_token(p, nfs_mount_option_tokens, args);
953 switch (token) {
f45663ce
CL		 954
955 /*
956 * boolean options: foo/nofoo
957 */
bf0fd768
CL		 958 case Opt_soft:
959 mnt->flags |= NFS_MOUNT_SOFT;
960 break;
961 case Opt_hard:
962 mnt->flags &= ~NFS_MOUNT_SOFT;
963 break;
bf0fd768
CL		 964 case Opt_posix:
965 mnt->flags |= NFS_MOUNT_POSIX;
966 break;
967 case Opt_noposix:
968 mnt->flags &= ~NFS_MOUNT_POSIX;
969 break;
970 case Opt_cto:
971 mnt->flags &= ~NFS_MOUNT_NOCTO;
972 break;
973 case Opt_nocto:
974 mnt->flags |= NFS_MOUNT_NOCTO;
975 break;
976 case Opt_ac:
977 mnt->flags &= ~NFS_MOUNT_NOAC;
978 break;
979 case Opt_noac:
980 mnt->flags |= NFS_MOUNT_NOAC;
981 break;
982 case Opt_lock:
983 mnt->flags &= ~NFS_MOUNT_NONLM;
984 break;
985 case Opt_nolock:
986 mnt->flags |= NFS_MOUNT_NONLM;
987 break;
988 case Opt_v2:
989 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 990 mnt->version = 2;
bf0fd768
CL		 991 break;
992 case Opt_v3:
993 mnt->flags |= NFS_MOUNT_VER3;
764302cc 994 mnt->version = 3;
bf0fd768 995 break;
764302cc
CL		 996#ifdef CONFIG_NFS_V4
997 case Opt_v4:
998 mnt->flags &= ~NFS_MOUNT_VER3;
999 mnt->version = 4;
1000 break;
1001#endif
bf0fd768
CL		 1002 case Opt_udp:
1003 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1004 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1005 break;
1006 case Opt_tcp:
1007 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1008 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1009 break;
2cf7ff7a
TT		 1010 case Opt_rdma:
1011 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1012 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1013 xprt_load_transport(p);
2cf7ff7a 1014 break;
bf0fd768
CL		 1015 case Opt_acl:
1016 mnt->flags &= ~NFS_MOUNT_NOACL;
1017 break;
1018 case Opt_noacl:
1019 mnt->flags |= NFS_MOUNT_NOACL;
1020 break;
1021 case Opt_rdirplus:
1022 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1023 break;
1024 case Opt_nordirplus:
1025 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1026 break;
75180df2
TM		 1027 case Opt_sharecache:
1028 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1029 break;
1030 case Opt_nosharecache:
1031 mnt->flags |= NFS_MOUNT_UNSHARED;
1032 break;
d740351b
CL		 1033 case Opt_resvport:
1034 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1035 break;
1036 case Opt_noresvport:
1037 mnt->flags |= NFS_MOUNT_NORESVPORT;
1038 break;
b797cac7
DH		 1039 case Opt_fscache:
1040 mnt->options |= NFS_OPTION_FSCACHE;
1041 kfree(mnt->fscache_uniq);
1042 mnt->fscache_uniq = NULL;
1043 break;
1044 case Opt_nofscache:
1045 mnt->options &= ~NFS_OPTION_FSCACHE;
1046 kfree(mnt->fscache_uniq);
1047 mnt->fscache_uniq = NULL;
1048 break;
1049 case Opt_fscache_uniq:
1050 string = match_strdup(args);
1051 if (!string)
1052 goto out_nomem;
1053 kfree(mnt->fscache_uniq);
1054 mnt->fscache_uniq = string;
1055 mnt->options |= NFS_OPTION_FSCACHE;
1056 break;
bf0fd768 1057
f45663ce
CL		 1058 /*
1059 * options that take numeric values
1060 */
bf0fd768 1061 case Opt_port:
a5a16bae
CL		 1062 string = match_strdup(args);
1063 if (string == NULL)
1064 goto out_nomem;
1065 rc = strict_strtoul(string, 10, &option);
1066 kfree(string);
1067 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1068 goto out_invalid_value;
1069 mnt->nfs_server.port = option;
bf0fd768
CL		 1070 break;
1071 case Opt_rsize:
a5a16bae
CL		 1072 string = match_strdup(args);
1073 if (string == NULL)
1074 goto out_nomem;
1075 rc = strict_strtoul(string, 10, &option);
1076 kfree(string);
1077 if (rc != 0)
d23c45fd
CL		 1078 goto out_invalid_value;
1079 mnt->rsize = option;
bf0fd768
CL		 1080 break;
1081 case Opt_wsize:
a5a16bae
CL		 1082 string = match_strdup(args);
1083 if (string == NULL)
1084 goto out_nomem;
1085 rc = strict_strtoul(string, 10, &option);
1086 kfree(string);
1087 if (rc != 0)
d23c45fd
CL		 1088 goto out_invalid_value;
1089 mnt->wsize = option;
bf0fd768
CL		 1090 break;
1091 case Opt_bsize:
a5a16bae
CL		 1092 string = match_strdup(args);
1093 if (string == NULL)
1094 goto out_nomem;
1095 rc = strict_strtoul(string, 10, &option);
1096 kfree(string);
1097 if (rc != 0)
d23c45fd
CL		 1098 goto out_invalid_value;
1099 mnt->bsize = option;
bf0fd768
CL		 1100 break;
1101 case Opt_timeo:
a5a16bae
CL		 1102 string = match_strdup(args);
1103 if (string == NULL)
1104 goto out_nomem;
1105 rc = strict_strtoul(string, 10, &option);
1106 kfree(string);
1107 if (rc != 0 || option == 0)
d23c45fd
CL		 1108 goto out_invalid_value;
1109 mnt->timeo = option;
bf0fd768
CL		 1110 break;
1111 case Opt_retrans:
a5a16bae
CL		 1112 string = match_strdup(args);
1113 if (string == NULL)
1114 goto out_nomem;
1115 rc = strict_strtoul(string, 10, &option);
1116 kfree(string);
1117 if (rc != 0 || option == 0)
d23c45fd
CL		 1118 goto out_invalid_value;
1119 mnt->retrans = option;
bf0fd768
CL		 1120 break;
1121 case Opt_acregmin:
a5a16bae
CL		 1122 string = match_strdup(args);
1123 if (string == NULL)
1124 goto out_nomem;
1125 rc = strict_strtoul(string, 10, &option);
1126 kfree(string);
1127 if (rc != 0)
d23c45fd
CL		 1128 goto out_invalid_value;
1129 mnt->acregmin = option;
bf0fd768
CL		 1130 break;
1131 case Opt_acregmax:
a5a16bae
CL		 1132 string = match_strdup(args);
1133 if (string == NULL)
1134 goto out_nomem;
1135 rc = strict_strtoul(string, 10, &option);
1136 kfree(string);
1137 if (rc != 0)
d23c45fd
CL		 1138 goto out_invalid_value;
1139 mnt->acregmax = option;
bf0fd768
CL		 1140 break;
1141 case Opt_acdirmin:
a5a16bae
CL		 1142 string = match_strdup(args);
1143 if (string == NULL)
1144 goto out_nomem;
1145 rc = strict_strtoul(string, 10, &option);
1146 kfree(string);
1147 if (rc != 0)
d23c45fd
CL		 1148 goto out_invalid_value;
1149 mnt->acdirmin = option;
bf0fd768
CL		 1150 break;
1151 case Opt_acdirmax:
a5a16bae
CL		 1152 string = match_strdup(args);
1153 if (string == NULL)
1154 goto out_nomem;
1155 rc = strict_strtoul(string, 10, &option);
1156 kfree(string);
1157 if (rc != 0)
d23c45fd
CL		 1158 goto out_invalid_value;
1159 mnt->acdirmax = option;
bf0fd768
CL		 1160 break;
1161 case Opt_actimeo:
a5a16bae
CL		 1162 string = match_strdup(args);
1163 if (string == NULL)
1164 goto out_nomem;
1165 rc = strict_strtoul(string, 10, &option);
1166 kfree(string);
1167 if (rc != 0)
d23c45fd
CL		 1168 goto out_invalid_value;
1169 mnt->acregmin = mnt->acregmax =
1170 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1171 break;
1172 case Opt_namelen:
a5a16bae
CL		 1173 string = match_strdup(args);
1174 if (string == NULL)
1175 goto out_nomem;
1176 rc = strict_strtoul(string, 10, &option);
1177 kfree(string);
1178 if (rc != 0)
d23c45fd
CL		 1179 goto out_invalid_value;
1180 mnt->namlen = option;
bf0fd768
CL		 1181 break;
1182 case Opt_mountport:
a5a16bae
CL		 1183 string = match_strdup(args);
1184 if (string == NULL)
1185 goto out_nomem;
1186 rc = strict_strtoul(string, 10, &option);
1187 kfree(string);
1188 if (rc != 0 || option > USHORT_MAX)
d23c45fd
CL		 1189 goto out_invalid_value;
1190 mnt->mount_server.port = option;
bf0fd768 1191 break;
bf0fd768 1192 case Opt_mountvers:
a5a16bae
CL		 1193 string = match_strdup(args);
1194 if (string == NULL)
1195 goto out_nomem;
1196 rc = strict_strtoul(string, 10, &option);
1197 kfree(string);
1198 if (rc != 0 ||
f45663ce 1199 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1200 option > NFS_MNT3_VERSION)
1201 goto out_invalid_value;
1202 mnt->mount_server.version = option;
bf0fd768 1203 break;
bf0fd768 1204 case Opt_nfsvers:
a5a16bae
CL		 1205 string = match_strdup(args);
1206 if (string == NULL)
1207 goto out_nomem;
1208 rc = strict_strtoul(string, 10, &option);
1209 kfree(string);
1210 if (rc != 0)
d23c45fd 1211 goto out_invalid_value;
bf0fd768 1212 switch (option) {
f45663ce 1213 case NFS2_VERSION:
bf0fd768 1214 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1215 mnt->version = 2;
bf0fd768 1216 break;
f45663ce 1217 case NFS3_VERSION:
bf0fd768 1218 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1219 mnt->version = 3;
1220 break;
1221#ifdef CONFIG_NFS_V4
1222 case NFS4_VERSION:
1223 mnt->flags &= ~NFS_MOUNT_VER3;
1224 mnt->version = 4;
bf0fd768 1225 break;
764302cc 1226#endif
bf0fd768 1227 default:
d23c45fd 1228 goto out_invalid_value;
bf0fd768
CL		 1229 }
1230 break;
3fd5be9e 1231 case Opt_minorversion:
f3f4f4ed
CL		 1232 string = match_strdup(args);
1233 if (string == NULL)
1234 goto out_nomem;
1235 rc = strict_strtoul(string, 10, &option);
1236 kfree(string);
1237 if (rc != 0)
1238 goto out_invalid_value;
1239 if (option > NFS4_MAX_MINOR_VERSION)
1240 goto out_invalid_value;
1241 mnt->minorversion = option;
3fd5be9e 1242 break;
bf0fd768 1243
f45663ce
CL		 1244 /*
1245 * options that take text values
1246 */
bf0fd768
CL		 1247 case Opt_sec:
1248 string = match_strdup(args);
1249 if (string == NULL)
1250 goto out_nomem;
01060c89 1251 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1252 kfree(string);
f45663ce 1253 if (!rc) {
f45663ce
CL		 1254 dfprintk(MOUNT, "NFS: unrecognized "
1255 "security flavor\n");
d23c45fd 1256 return 0;
f45663ce 1257 }
bf0fd768
CL		 1258 break;
1259 case Opt_proto:
1260 string = match_strdup(args);
1261 if (string == NULL)
1262 goto out_nomem;
1263 token = match_token(string,
1264 nfs_xprt_protocol_tokens, args);
bf0fd768 1265
ee671b01 1266 protofamily = AF_INET;
bf0fd768 1267 switch (token) {
ee671b01
JL		 1268 case Opt_xprt_udp6:
1269 protofamily = AF_INET6;
fdb66ff4 1270 case Opt_xprt_udp:
bf0fd768 1271 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1272 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
d23c45fd 1273 kfree(string);
bf0fd768 1274 break;
ee671b01
JL		 1275 case Opt_xprt_tcp6:
1276 protofamily = AF_INET6;
fdb66ff4 1277 case Opt_xprt_tcp:
bf0fd768 1278 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1279 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
d23c45fd 1280 kfree(string);
bf0fd768 1281 break;
2cf7ff7a
TT		 1282 case Opt_xprt_rdma:
1283 /* vector side protocols to TCP */
1284 mnt->flags |= NFS_MOUNT_TCP;
1285 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1286 xprt_load_transport(string);
d23c45fd 1287 kfree(string);
2cf7ff7a 1288 break;
bf0fd768 1289 default:
f45663ce
CL		 1290 dfprintk(MOUNT, "NFS: unrecognized "
1291 "transport protocol\n");
4223a4a1 1292 kfree(string);
d23c45fd 1293 return 0;
bf0fd768
CL		 1294 }
1295 break;
1296 case Opt_mountproto:
1297 string = match_strdup(args);
1298 if (string == NULL)
1299 goto out_nomem;
1300 token = match_token(string,
1301 nfs_xprt_protocol_tokens, args);
d508afb4 1302 kfree(string);
bf0fd768 1303
ee671b01 1304 mountfamily = AF_INET;
bf0fd768 1305 switch (token) {
ee671b01
JL		 1306 case Opt_xprt_udp6:
1307 mountfamily = AF_INET6;
fdb66ff4 1308 case Opt_xprt_udp:
0896a725 1309 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1310 break;
ee671b01
JL		 1311 case Opt_xprt_tcp6:
1312 mountfamily = AF_INET6;
fdb66ff4 1313 case Opt_xprt_tcp:
0896a725 1314 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1315 break;
2cf7ff7a 1316 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1317 default:
f45663ce
CL		 1318 dfprintk(MOUNT, "NFS: unrecognized "
1319 "transport protocol\n");
d23c45fd 1320 return 0;
bf0fd768
CL		 1321 }
1322 break;
1323 case Opt_addr:
1324 string = match_strdup(args);
1325 if (string == NULL)
1326 goto out_nomem;
53a0b9c4
CL		 1327 mnt->nfs_server.addrlen =
1328 rpc_pton(string, strlen(string),
1329 (struct sockaddr *)
1330 &mnt->nfs_server.address,
1331 sizeof(mnt->nfs_server.address));
bf0fd768 1332 kfree(string);
53a0b9c4
CL		 1333 if (mnt->nfs_server.addrlen == 0)
1334 goto out_invalid_address;
bf0fd768
CL		 1335 break;
1336 case Opt_clientaddr:
1337 string = match_strdup(args);
1338 if (string == NULL)
1339 goto out_nomem;
fc601477 1340 kfree(mnt->client_address);
bf0fd768
CL		 1341 mnt->client_address = string;
1342 break;
33832034
CL		 1343 case Opt_mounthost:
1344 string = match_strdup(args);
1345 if (string == NULL)
1346 goto out_nomem;
fc601477 1347 kfree(mnt->mount_server.hostname);
33832034
CL		 1348 mnt->mount_server.hostname = string;
1349 break;
0ac83779 1350 case Opt_mountaddr:
bf0fd768
CL		 1351 string = match_strdup(args);
1352 if (string == NULL)
1353 goto out_nomem;
53a0b9c4
CL		 1354 mnt->mount_server.addrlen =
1355 rpc_pton(string, strlen(string),
1356 (struct sockaddr *)
1357 &mnt->mount_server.address,
1358 sizeof(mnt->mount_server.address));
bf0fd768 1359 kfree(string);
53a0b9c4
CL		 1360 if (mnt->mount_server.addrlen == 0)
1361 goto out_invalid_address;
bf0fd768 1362 break;
7973c1f1
TM		 1363 case Opt_lookupcache:
1364 string = match_strdup(args);
1365 if (string == NULL)
1366 goto out_nomem;
1367 token = match_token(string,
1368 nfs_lookupcache_tokens, args);
1369 kfree(string);
1370 switch (token) {
1371 case Opt_lookupcache_all:
1372 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1373 break;
1374 case Opt_lookupcache_positive:
1375 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1376 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1377 break;
1378 case Opt_lookupcache_none:
1379 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1380 break;
1381 default:
7973c1f1
TM		 1382 dfprintk(MOUNT, "NFS: invalid "
1383 "lookupcache argument\n");
d23c45fd 1384 return 0;
7973c1f1
TM		 1385 };
1386 break;
bf0fd768 1387
f45663ce
CL		 1388 /*
1389 * Special options
1390 */
1391 case Opt_sloppy:
1392 sloppy = 1;
1393 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1394 break;
bf0fd768
CL		 1395 case Opt_userspace:
1396 case Opt_deprecated:
d33e4dfe
CL		 1397 dfprintk(MOUNT, "NFS: ignoring mount option "
1398 "'%s'\n", p);
bf0fd768
CL		 1399 break;
1400
1401 default:
d23c45fd 1402 invalid_option = 1;
f45663ce
CL		 1403 dfprintk(MOUNT, "NFS: unrecognized mount option "
1404 "'%s'\n", p);
bf0fd768
CL		 1405 }
1406 }
1407
d23c45fd
CL		 1408 if (!sloppy && invalid_option)
1409 return 0;
1410
ee671b01
JL		 1411 /*
1412 * verify that any proto=/mountproto= options match the address
1413 * familiies in the addr=/mountaddr= options.
1414 */
1415 if (protofamily != AF_UNSPEC &&
1416 protofamily != mnt->nfs_server.address.ss_family)
1417 goto out_proto_mismatch;
1418
1419 if (mountfamily != AF_UNSPEC) {
1420 if (mnt->mount_server.addrlen) {
1421 if (mountfamily != mnt->mount_server.address.ss_family)
1422 goto out_mountproto_mismatch;
1423 } else {
1424 if (mountfamily != mnt->nfs_server.address.ss_family)
1425 goto out_mountproto_mismatch;
1426 }
1427 }
1428
bf0fd768
CL		 1429 return 1;
1430
ee671b01
JL		 1431out_mountproto_mismatch:
1432 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1433 "option\n");
1434 return 0;
1435out_proto_mismatch:
1436 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1437 return 0;
53a0b9c4
CL		 1438out_invalid_address:
1439 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1440 return 0;
d23c45fd 1441out_invalid_value:
53a0b9c4 1442 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1443 return 0;
bf0fd768
CL		 1444out_nomem:
1445 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1446 return 0;
f9c3a380
EP		 1447out_security_failure:
1448 free_secdata(secdata);
1449 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1450 return 0;
bf0fd768
CL		 1451}
1452
ec88f28d
CL		 1453/*
1454 * Match the requested auth flavors with the list returned by
1455 * the server. Returns zero and sets the mount's authentication
1456 * flavor on success; returns -EACCES if server does not support
1457 * the requested flavor.
1458 */
1459static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1460 struct nfs_mount_request *request)
1461{
1462 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1463
5eecfde6
CL		 1464 /*
1465 * Certain releases of Linux's mountd return an empty
1466 * flavor list. To prevent behavioral regression with
1467 * these servers (ie. rejecting mounts that used to
1468 * succeed), revert to pre-2.6.32 behavior (no checking)
1469 * if the returned flavor list is empty.
1470 */
1471 if (server_authlist_len == 0)
1472 return 0;
1473
ec88f28d
CL		 1474 /*
1475 * We avoid sophisticated negotiating here, as there are
1476 * plenty of cases where we can get it wrong, providing
1477 * either too little or too much security.
1478 *
1479 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1480 * flavor listed first. However, some servers list
1481 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1482 * preferred default, in args->auth_flavors[0] if user
1483 * didn't specify sec= mount option.
1484 */
1485 for (i = 0; i < args->auth_flavor_len; i++)
1486 for (j = 0; j < server_authlist_len; j++)
1487 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1488 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1489 request->auth_flavs[j]);
1490 args->auth_flavors[0] = request->auth_flavs[j];
1491 return 0;
1492 }
1493
1494 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1495 nfs_umount(request);
1496 return -EACCES;
1497}
1498
0076d7b7
CL		 1499/*
1500 * Use the remote server's MOUNT service to request the NFS file handle
1501 * corresponding to the provided path.
1502 */
1503static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1504 struct nfs_fh *root_fh)
1505{
ec88f28d
CL		 1506 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1507 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1508 struct nfs_mount_request request = {
1509 .sap = (struct sockaddr *)
1510 &args->mount_server.address,
1511 .dirpath = args->nfs_server.export_path,
1512 .protocol = args->mount_server.protocol,
1513 .fh = root_fh,
50a737f8 1514 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1515 .auth_flav_len = &server_authlist_len,
1516 .auth_flavs = server_authlist,
c5d120f8 1517 };
4c568017 1518 int status;
0076d7b7
CL		 1519
1520 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1521 switch (args->version) {
1522 default:
1523 args->mount_server.version = NFS_MNT3_VERSION;
1524 break;
1525 case 2:
1526 args->mount_server.version = NFS_MNT_VERSION;
1527 }
0076d7b7 1528 }
c5d120f8 1529 request.version = args->mount_server.version;
0076d7b7 1530
33832034 1531 if (args->mount_server.hostname)
c5d120f8 1532 request.hostname = args->mount_server.hostname;
33832034 1533 else
c5d120f8 1534 request.hostname = args->nfs_server.hostname;
33832034 1535
0076d7b7
CL		 1536 /*
1537 * Construct the mount server's address.
1538 */
4c568017 1539 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1540 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1541 args->nfs_server.addrlen);
1542 args->mount_server.addrlen = args->nfs_server.addrlen;
1543 }
c5d120f8 1544 request.salen = args->mount_server.addrlen;
f5855fec 1545 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1546
1547 /*
1548 * Now ask the mount server to map our export path
1549 * to a file handle.
1550 */
c5d120f8 1551 status = nfs_mount(&request);
ec88f28d
CL		 1552 if (status != 0) {
1553 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1554 request.hostname, status);
1555 return status;
1556 }
0076d7b7 1557
ec88f28d
CL		 1558 /*
1559 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1560 */
1561 if (args->mount_server.version != NFS_MNT3_VERSION)
1562 return 0;
1563 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1564}
1565
d1aa0825
CL		 1566static int nfs_parse_simple_hostname(const char *dev_name,
1567 char **hostname, size_t maxnamlen,
1568 char **export_path, size_t maxpathlen)
dc045898
CL		 1569{
1570 size_t len;
1571 char *colon, *comma;
1572
1573 colon = strchr(dev_name, ':');
1574 if (colon == NULL)
1575 goto out_bad_devname;
1576
1577 len = colon - dev_name;
1578 if (len > maxnamlen)
1579 goto out_hostname;
1580
1581 /* N.B. caller will free nfs_server.hostname in all cases */
1582 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1583 if (!*hostname)
1584 goto out_nomem;
1585
1586 /* kill possible hostname list: not supported */
1587 comma = strchr(*hostname, ',');
1588 if (comma != NULL) {
1589 if (comma == *hostname)
1590 goto out_bad_devname;
1591 *comma = '\0';
1592 }
1593
1594 colon++;
1595 len = strlen(colon);
1596 if (len > maxpathlen)
1597 goto out_path;
1598 *export_path = kstrndup(colon, len, GFP_KERNEL);
1599 if (!*export_path)
1600 goto out_nomem;
1601
1602 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1603 return 0;
1604
1605out_bad_devname:
1606 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1607 return -EINVAL;
1608
1609out_nomem:
1610 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1611 return -ENOMEM;
1612
1613out_hostname:
1614 dfprintk(MOUNT, "NFS: server hostname too long\n");
1615 return -ENAMETOOLONG;
1616
1617out_path:
1618 dfprintk(MOUNT, "NFS: export pathname too long\n");
1619 return -ENAMETOOLONG;
1620}
1621
d1aa0825
CL		 1622/*
1623 * Hostname has square brackets around it because it contains one or
1624 * more colons. We look for the first closing square bracket, and a
1625 * colon must follow it.
1626 */
1627static int nfs_parse_protected_hostname(const char *dev_name,
1628 char **hostname, size_t maxnamlen,
1629 char **export_path, size_t maxpathlen)
1630{
1631 size_t len;
1632 char *start, *end;
1633
1634 start = (char *)(dev_name + 1);
1635
1636 end = strchr(start, ']');
1637 if (end == NULL)
1638 goto out_bad_devname;
1639 if (*(end + 1) != ':')
1640 goto out_bad_devname;
1641
1642 len = end - start;
1643 if (len > maxnamlen)
1644 goto out_hostname;
1645
1646 /* N.B. caller will free nfs_server.hostname in all cases */
1647 *hostname = kstrndup(start, len, GFP_KERNEL);
1648 if (*hostname == NULL)
1649 goto out_nomem;
1650
1651 end += 2;
1652 len = strlen(end);
1653 if (len > maxpathlen)
1654 goto out_path;
1655 *export_path = kstrndup(end, len, GFP_KERNEL);
1656 if (!*export_path)
1657 goto out_nomem;
1658
1659 return 0;
1660
1661out_bad_devname:
1662 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1663 return -EINVAL;
1664
1665out_nomem:
1666 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1667 return -ENOMEM;
1668
1669out_hostname:
1670 dfprintk(MOUNT, "NFS: server hostname too long\n");
1671 return -ENAMETOOLONG;
1672
1673out_path:
1674 dfprintk(MOUNT, "NFS: export pathname too long\n");
1675 return -ENAMETOOLONG;
1676}
1677
1678/*
1679 * Split "dev_name" into "hostname:export_path".
1680 *
1681 * The leftmost colon demarks the split between the server's hostname
1682 * and the export path. If the hostname starts with a left square
1683 * bracket, then it may contain colons.
1684 *
1685 * Note: caller frees hostname and export path, even on error.
1686 */
1687static int nfs_parse_devname(const char *dev_name,
1688 char **hostname, size_t maxnamlen,
1689 char **export_path, size_t maxpathlen)
1690{
1691 if (*dev_name == '[')
1692 return nfs_parse_protected_hostname(dev_name,
1693 hostname, maxnamlen,
1694 export_path, maxpathlen);
1695
1696 return nfs_parse_simple_hostname(dev_name,
1697 hostname, maxnamlen,
1698 export_path, maxpathlen);
1699}
1700
f7b422b1 1701/*
54ceac45
DH		 1702 * Validate the NFS2/NFS3 mount data
1703 * - fills in the mount root filehandle
136d558c
CL		 1704 *
1705 * For option strings, user space handles the following behaviors:
1706 *
1707 * + DNS: mapping server host name to IP address ("addr=" option)
1708 *
1709 * + failure mode: how to behave if a mount request can't be handled
1710 * immediately ("fg/bg" option)
1711 *
1712 * + retry: how often to retry a mount request ("retry=" option)
1713 *
1714 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1715 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1716 */
2283f8d6
TT		 1717static int nfs_validate_mount_data(void *options,
1718 struct nfs_parsed_mount_data *args,
136d558c
CL		 1719 struct nfs_fh *mntfh,
1720 const char *dev_name)
f7b422b1 1721{
2283f8d6 1722 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1723 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1724
5df36e78
CL		 1725 if (data == NULL)
1726 goto out_no_data;
f7b422b1 1727
54ceac45 1728 switch (data->version) {
5df36e78
CL		 1729 case 1:
1730 data->namlen = 0;
1731 case 2:
1732 data->bsize = 0;
1733 case 3:
1734 if (data->flags & NFS_MOUNT_VER3)
1735 goto out_no_v3;
1736 data->root.size = NFS2_FHSIZE;
1737 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1738 case 4:
1739 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1740 goto out_no_sec;
1741 case 5:
1742 memset(data->context, 0, sizeof(data->context));
1743 case 6:
b7e24457
TM		 1744 if (data->flags & NFS_MOUNT_VER3) {
1745 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1746 goto out_invalid_fh;
5df36e78 1747 mntfh->size = data->root.size;
764302cc
CL		 1748 args->version = 3;
1749 } else {
5df36e78 1750 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1751 args->version = 2;
1752 }
5df36e78 1753
5df36e78
CL		 1754
1755 memcpy(mntfh->data, data->root.data, mntfh->size);
1756 if (mntfh->size < sizeof(mntfh->data))
1757 memset(mntfh->data + mntfh->size, 0,
1758 sizeof(mntfh->data) - mntfh->size);
6e88e061 1759
2283f8d6
TT		 1760 /*
1761 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1762 * can deal with.
1763 */
ff3525a5 1764 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2283f8d6
TT		 1765 args->rsize = data->rsize;
1766 args->wsize = data->wsize;
2283f8d6
TT		 1767 args->timeo = data->timeo;
1768 args->retrans = data->retrans;
1769 args->acregmin = data->acregmin;
1770 args->acregmax = data->acregmax;
1771 args->acdirmin = data->acdirmin;
1772 args->acdirmax = data->acdirmax;
4c568017 1773
4cfd74fc 1774 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1775 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1776 if (!nfs_verify_server_address(sap))
4c568017
CL		 1777 goto out_no_address;
1778
2283f8d6 1779 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1780 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1781 /* N.B. caller will free nfs_server.hostname in all cases */
1782 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1783 args->namlen = data->namlen;
1784 args->bsize = data->bsize;
dd07c947
CL		 1785
1786 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1787 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1788 if (!args->nfs_server.hostname)
1789 goto out_nomem;
f9c3a380
EP		 1790
1791 /*
1792 * The legacy version 6 binary mount data from userspace has a
1793 * field used only to transport selinux information into the
1794 * the kernel. To continue to support that functionality we
1795 * have a touch of selinux knowledge here in the NFS code. The
1796 * userspace code converted context=blah to just blah so we are
1797 * converting back to the full string selinux understands.
1798 */
1799 if (data->context[0]){
1800#ifdef CONFIG_SECURITY_SELINUX
1801 int rc;
1802 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1803 if (!opts_str)
1804 return -ENOMEM;
1805 strcpy(opts_str, "context=");
1806 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1807 strcat(opts_str, &data->context[0]);
1808 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1809 kfree(opts_str);
1810 if (rc)
1811 return rc;
1812#else
1813 return -EINVAL;
1814#endif
1815 }
1816
5df36e78 1817 break;
136d558c 1818 default: {
136d558c 1819 int status;
136d558c 1820
2283f8d6
TT		 1821 if (nfs_parse_mount_options((char *)options, args) == 0)
1822 return -EINVAL;
136d558c 1823
4cfd74fc 1824 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1825 goto out_no_address;
1826
764302cc
CL		 1827 if (args->version == 4)
1828#ifdef CONFIG_NFS_V4
1829 return nfs4_validate_text_mount_data(options,
1830 args, dev_name);
1831#else
1832 goto out_v4_not_compiled;
1833#endif
1834
f5855fec 1835 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1836
259875ef
TM		 1837 nfs_set_mount_transport_protocol(args);
1838
dc045898
CL		 1839 status = nfs_parse_devname(dev_name,
1840 &args->nfs_server.hostname,
1841 PAGE_SIZE,
1842 &args->nfs_server.export_path,
1843 NFS_MAXPATHLEN);
1844 if (!status)
1845 status = nfs_try_mount(args, mntfh);
136d558c 1846
dc045898
CL		 1847 kfree(args->nfs_server.export_path);
1848 args->nfs_server.export_path = NULL;
136d558c 1849
136d558c 1850 if (status)
fdc6e2c8 1851 return status;
136d558c 1852
136d558c
CL		 1853 break;
1854 }
f7b422b1 1855 }
54ceac45
DH		 1856
1857#ifndef CONFIG_NFS_V3
8a6e5deb 1858 if (args->version == 3)
5df36e78
CL		 1859 goto out_v3_not_compiled;
1860#endif /* !CONFIG_NFS_V3 */
f7b422b1 1861
5df36e78 1862 return 0;
f7b422b1 1863
5df36e78
CL		 1864out_no_data:
1865 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1866 return -EINVAL;
54ceac45 1867
5df36e78
CL		 1868out_no_v3:
1869 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1870 data->version);
1871 return -EINVAL;
f7b422b1 1872
5df36e78
CL		 1873out_no_sec:
1874 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1875 return -EINVAL;
1876
5df36e78
CL		 1877#ifndef CONFIG_NFS_V3
1878out_v3_not_compiled:
1879 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1880 return -EPROTONOSUPPORT;
1881#endif /* !CONFIG_NFS_V3 */
1882
764302cc
CL		 1883#ifndef CONFIG_NFS_V4
1884out_v4_not_compiled:
1885 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1886 return -EPROTONOSUPPORT;
1887#endif /* !CONFIG_NFS_V4 */
1888
63649bd7
CG		 1889out_nomem:
1890 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1891 return -ENOMEM;
1892
5df36e78
CL		 1893out_no_address:
1894 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1895 return -EINVAL;
1896
1897out_invalid_fh:
1898 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1899 return -EINVAL;
f7b422b1
DH		 1900}
1901
48b605f8
JL		 1902static int
1903nfs_compare_remount_data(struct nfs_server *nfss,
1904 struct nfs_parsed_mount_data *data)
1905{
1906 if (data->flags != nfss->flags ||
1907 data->rsize != nfss->rsize ||
1908 data->wsize != nfss->wsize ||
1909 data->retrans != nfss->client->cl_timeout->to_retries ||
1910 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1911 data->acregmin != nfss->acregmin / HZ ||
1912 data->acregmax != nfss->acregmax / HZ ||
1913 data->acdirmin != nfss->acdirmin / HZ ||
1914 data->acdirmax != nfss->acdirmax / HZ ||
1915 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1916 data->nfs_server.port != nfss->port ||
48b605f8 1917 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1918 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1919 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1920 return -EINVAL;
1921
1922 return 0;
1923}
1924
1925static int
1926nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1927{
1928 int error;
1929 struct nfs_server *nfss = sb->s_fs_info;
1930 struct nfs_parsed_mount_data *data;
1931 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1932 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1933 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1934
1935 /*
1936 * Userspace mount programs that send binary options generally send
1937 * them populated with default values. We have no way to know which
1938 * ones were explicitly specified. Fall back to legacy behavior and
1939 * just return success.
1940 */
31c94469
MZ		 1941 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1942 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1943 options->version <= 6))))
48b605f8
JL		 1944 return 0;
1945
1946 data = kzalloc(sizeof(*data), GFP_KERNEL);
1947 if (data == NULL)
1948 return -ENOMEM;
1949
1950 /* fill out struct with values from existing mount */
1951 data->flags = nfss->flags;
1952 data->rsize = nfss->rsize;
1953 data->wsize = nfss->wsize;
1954 data->retrans = nfss->client->cl_timeout->to_retries;
1955 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1956 data->acregmin = nfss->acregmin / HZ;
1957 data->acregmax = nfss->acregmax / HZ;
1958 data->acdirmin = nfss->acdirmin / HZ;
1959 data->acdirmax = nfss->acdirmax / HZ;
1960 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 1961 data->nfs_server.port = nfss->port;
48b605f8
JL		 1962 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1963 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1964 data->nfs_server.addrlen);
1965
1966 /* overwrite those values with any that were specified */
1967 error = nfs_parse_mount_options((char *)options, data);
1968 if (error < 0)
1969 goto out;
1970
1971 /* compare new mount options with old ones */
1972 error = nfs_compare_remount_data(nfss, data);
1973out:
1974 kfree(data);
1975 return error;
1976}
1977
f7b422b1 1978/*
54ceac45 1979 * Initialise the common bits of the superblock
f7b422b1 1980 */
54ceac45 1981static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1982{
54ceac45 1983 struct nfs_server *server = NFS_SB(sb);
5006a76c 1984
54ceac45 1985 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1986
54ceac45
DH		 1987 /* We probably want something more informative here */
1988 snprintf(sb->s_id, sizeof(sb->s_id),
1989 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1990
54ceac45
DH		 1991 if (sb->s_blocksize == 0)
1992 sb->s_blocksize = nfs_block_bits(server->wsize,
1993 &sb->s_blocksize_bits);
f7b422b1 1994
54ceac45
DH		 1995 if (server->flags & NFS_MOUNT_NOAC)
1996 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1997
32a88aa1
JA		 1998 sb->s_bdi = &server->backing_dev_info;
1999
54ceac45 2000 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2001}
2002
2003/*
54ceac45 2004 * Finish setting up an NFS2/3 superblock
f7b422b1 2005 */
2283f8d6
TT		 2006static void nfs_fill_super(struct super_block *sb,
2007 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2008{
2009 struct nfs_server *server = NFS_SB(sb);
5006a76c 2010
54ceac45
DH		 2011 sb->s_blocksize_bits = 0;
2012 sb->s_blocksize = 0;
2013 if (data->bsize)
2014 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2015
8a6e5deb 2016 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2017 /* The VFS shouldn't apply the umask to mode bits. We will do
2018 * so ourselves when necessary.
2019 */
2020 sb->s_flags |= MS_POSIXACL;
2021 sb->s_time_gran = 1;
816724e6 2022 }
54ceac45
DH		 2023
2024 sb->s_op = &nfs_sops;
2025 nfs_initialise_sb(sb);
f7b422b1
DH		 2026}
2027
2028/*
54ceac45 2029 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2030 */
54ceac45
DH		 2031static void nfs_clone_super(struct super_block *sb,
2032 const struct super_block *old_sb)
f7b422b1 2033{
54ceac45
DH		 2034 struct nfs_server *server = NFS_SB(sb);
2035
2036 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2037 sb->s_blocksize = old_sb->s_blocksize;
2038 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2039
8a6e5deb 2040 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2041 /* The VFS shouldn't apply the umask to mode bits. We will do
2042 * so ourselves when necessary.
f7b422b1
DH		 2043 */
2044 sb->s_flags |= MS_POSIXACL;
f7b422b1 2045 sb->s_time_gran = 1;
f7b422b1
DH		 2046 }
2047
54ceac45
DH		 2048 sb->s_op = old_sb->s_op;
2049 nfs_initialise_sb(sb);
f7b422b1
DH		 2050}
2051
275a5d24
TM		 2052static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2053{
2054 const struct nfs_server *a = s->s_fs_info;
2055 const struct rpc_clnt *clnt_a = a->client;
2056 const struct rpc_clnt *clnt_b = b->client;
2057
2058 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2059 goto Ebusy;
2060 if (a->nfs_client != b->nfs_client)
2061 goto Ebusy;
2062 if (a->flags != b->flags)
2063 goto Ebusy;
2064 if (a->wsize != b->wsize)
2065 goto Ebusy;
2066 if (a->rsize != b->rsize)
2067 goto Ebusy;
2068 if (a->acregmin != b->acregmin)
2069 goto Ebusy;
2070 if (a->acregmax != b->acregmax)
2071 goto Ebusy;
2072 if (a->acdirmin != b->acdirmin)
2073 goto Ebusy;
2074 if (a->acdirmax != b->acdirmax)
2075 goto Ebusy;
2076 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2077 goto Ebusy;
e89a5a43 2078 return 1;
275a5d24 2079Ebusy:
e89a5a43
TM		 2080 return 0;
2081}
2082
2083struct nfs_sb_mountdata {
2084 struct nfs_server *server;
2085 int mntflags;
2086};
2087
2088static int nfs_set_super(struct super_block *s, void *data)
2089{
2090 struct nfs_sb_mountdata *sb_mntdata = data;
2091 struct nfs_server *server = sb_mntdata->server;
2092 int ret;
2093
2094 s->s_flags = sb_mntdata->mntflags;
2095 s->s_fs_info = server;
2096 ret = set_anon_super(s, server);
2097 if (ret == 0)
2098 server->s_dev = s->s_dev;
2099 return ret;
2100}
2101
fd00a8ff
CL		 2102static int nfs_compare_super_address(struct nfs_server *server1,
2103 struct nfs_server *server2)
2104{
2105 struct sockaddr *sap1, *sap2;
2106
2107 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2108 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2109
2110 if (sap1->sa_family != sap2->sa_family)
2111 return 0;
2112
2113 switch (sap1->sa_family) {
2114 case AF_INET: {
2115 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2116 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2117 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2118 return 0;
2119 if (sin1->sin_port != sin2->sin_port)
2120 return 0;
2121 break;
2122 }
2123 case AF_INET6: {
2124 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2125 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2126 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2127 return 0;
2128 if (sin1->sin6_port != sin2->sin6_port)
2129 return 0;
2130 break;
2131 }
2132 default:
2133 return 0;
2134 }
2135
2136 return 1;
2137}
2138
e89a5a43
TM		 2139static int nfs_compare_super(struct super_block *sb, void *data)
2140{
2141 struct nfs_sb_mountdata *sb_mntdata = data;
2142 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2143 int mntflags = sb_mntdata->mntflags;
2144
fd00a8ff 2145 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2146 return 0;
2147 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2148 if (old->flags & NFS_MOUNT_UNSHARED)
2149 return 0;
2150 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2151 return 0;
2152 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2153}
2154
fa799759
MS		 2155static int nfs_bdi_register(struct nfs_server *server)
2156{
2157 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2158}
2159
816724e6
TM		 2160static int nfs_get_sb(struct file_system_type *fs_type,
2161 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2162{
f7b422b1
DH		 2163 struct nfs_server *server = NULL;
2164 struct super_block *s;
33852a1f
TM		 2165 struct nfs_parsed_mount_data *data;
2166 struct nfs_fh *mntfh;
54ceac45 2167 struct dentry *mntroot;
75180df2 2168 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2169 struct nfs_sb_mountdata sb_mntdata = {
2170 .mntflags = flags,
2171 };
33852a1f
TM		 2172 int error = -ENOMEM;
2173
c5811dbd 2174 data = nfs_alloc_parsed_mount_data(3);
33852a1f
TM		 2175 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2176 if (data == NULL || mntfh == NULL)
2177 goto out_free_fh;
f7b422b1 2178
33852a1f 2179 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2180
54ceac45 2181 /* Validate the mount data */
33852a1f 2182 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 2183 if (error < 0)
0655960f 2184 goto out;
f7b422b1 2185
764302cc
CL		 2186#ifdef CONFIG_NFS_V4
2187 if (data->version == 4) {
2188 error = nfs4_try_mount(flags, dev_name, data, mnt);
2189 kfree(data->client_address);
9699eda6 2190 kfree(data->nfs_server.export_path);
764302cc
CL		 2191 goto out;
2192 }
2193#endif /* CONFIG_NFS_V4 */
2194
54ceac45 2195 /* Get a volume representation */
33852a1f 2196 server = nfs_create_server(data, mntfh);
54ceac45
DH		 2197 if (IS_ERR(server)) {
2198 error = PTR_ERR(server);
0655960f 2199 goto out;
f7b422b1 2200 }
e89a5a43 2201 sb_mntdata.server = server;
f7b422b1 2202
75180df2
TM		 2203 if (server->flags & NFS_MOUNT_UNSHARED)
2204 compare_super = NULL;
2205
54ceac45 2206 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2207 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2208 if (IS_ERR(s)) {
2209 error = PTR_ERR(s);
54ceac45 2210 goto out_err_nosb;
816724e6
TM		 2211 }
2212
54ceac45
DH		 2213 if (s->s_fs_info != server) {
2214 nfs_free_server(server);
2215 server = NULL;
fa799759
MS		 2216 } else {
2217 error = nfs_bdi_register(server);
2218 if (error)
cfbc0683 2219 goto error_splat_bdi;
54ceac45 2220 }
f7b422b1 2221
54ceac45
DH		 2222 if (!s->s_root) {
2223 /* initial superblock/root creation */
33852a1f 2224 nfs_fill_super(s, data);
2df54806
DH		 2225 nfs_fscache_get_super_cookie(
2226 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2227 }
f7b422b1 2228
33852a1f 2229 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 2230 if (IS_ERR(mntroot)) {
2231 error = PTR_ERR(mntroot);
2232 goto error_splat_super;
f7b422b1 2233 }
816724e6 2234
33852a1f 2235 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2236 if (error)
2237 goto error_splat_root;
2238
54ceac45
DH		 2239 s->s_flags |= MS_ACTIVE;
2240 mnt->mnt_sb = s;
2241 mnt->mnt_root = mntroot;
0655960f
CL		 2242 error = 0;
2243
2244out:
33852a1f
TM		 2245 kfree(data->nfs_server.hostname);
2246 kfree(data->mount_server.hostname);
08734048 2247 kfree(data->fscache_uniq);
33852a1f
TM		 2248 security_free_mnt_opts(&data->lsm_opts);
2249out_free_fh:
2250 kfree(mntfh);
2251 kfree(data);
0655960f 2252 return error;
816724e6 2253
54ceac45
DH		 2254out_err_nosb:
2255 nfs_free_server(server);
0655960f 2256 goto out;
54ceac45 2257
f9c3a380
EP		 2258error_splat_root:
2259 dput(mntroot);
54ceac45 2260error_splat_super:
cfbc0683
N		 2261 if (server && !s->s_root)
2262 bdi_unregister(&server->backing_dev_info);
2263error_splat_bdi:
6f5bbff9 2264 deactivate_locked_super(s);
0655960f 2265 goto out;
f7b422b1
DH		 2266}
2267
387c149b
TM		 2268/*
2269 * Ensure that we unregister the bdi before kill_anon_super
2270 * releases the device name
2271 */
2272static void nfs_put_super(struct super_block *s)
2273{
2274 struct nfs_server *server = NFS_SB(s);
2275
2276 bdi_unregister(&server->backing_dev_info);
2277}
2278
54ceac45
DH		 2279/*
2280 * Destroy an NFS2/3 superblock
2281 */
f7b422b1
DH		 2282static void nfs_kill_super(struct super_block *s)
2283{
2284 struct nfs_server *server = NFS_SB(s);
2285
2286 kill_anon_super(s);
08734048 2287 nfs_fscache_release_super_cookie(s);
54ceac45 2288 nfs_free_server(server);
f7b422b1
DH		 2289}
2290
54ceac45
DH		 2291/*
2292 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2293 */
2294static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2295 const char *dev_name, void *raw_data,
2296 struct vfsmount *mnt)
f7b422b1
DH		 2297{
2298 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2299 struct super_block *s;
2300 struct nfs_server *server;
2301 struct dentry *mntroot;
75180df2 2302 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2303 struct nfs_sb_mountdata sb_mntdata = {
2304 .mntflags = flags,
2305 };
54ceac45 2306 int error;
f7b422b1 2307
54ceac45 2308 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2309
54ceac45
DH		 2310 /* create a new volume representation */
2311 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2312 if (IS_ERR(server)) {
2313 error = PTR_ERR(server);
2314 goto out_err_noserver;
2315 }
e89a5a43 2316 sb_mntdata.server = server;
8fa5c000 2317
75180df2
TM		 2318 if (server->flags & NFS_MOUNT_UNSHARED)
2319 compare_super = NULL;
2320
54ceac45 2321 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2322 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2323 if (IS_ERR(s)) {
2324 error = PTR_ERR(s);
2325 goto out_err_nosb;
2326 }
5006a76c 2327
54ceac45
DH		 2328 if (s->s_fs_info != server) {
2329 nfs_free_server(server);
2330 server = NULL;
fa799759
MS		 2331 } else {
2332 error = nfs_bdi_register(server);
2333 if (error)
cfbc0683 2334 goto error_splat_bdi;
f7b422b1 2335 }
24c8dbbb 2336
54ceac45
DH		 2337 if (!s->s_root) {
2338 /* initial superblock/root creation */
54ceac45 2339 nfs_clone_super(s, data->sb);
2df54806 2340 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2341 }
f7b422b1 2342
54ceac45
DH		 2343 mntroot = nfs_get_root(s, data->fh);
2344 if (IS_ERR(mntroot)) {
2345 error = PTR_ERR(mntroot);
2346 goto error_splat_super;
f7b422b1 2347 }
e9cc6c23 2348 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2349 dput(mntroot);
2350 error = -ESTALE;
2351 goto error_splat_super;
2352 }
f7b422b1 2353
54ceac45
DH		 2354 s->s_flags |= MS_ACTIVE;
2355 mnt->mnt_sb = s;
2356 mnt->mnt_root = mntroot;
f7b422b1 2357
f9c3a380
EP		 2358 /* clone any lsm security options from the parent to the new sb */
2359 security_sb_clone_mnt_opts(data->sb, s);
2360
54ceac45
DH		 2361 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2362 return 0;
24c8dbbb 2363
54ceac45
DH		 2364out_err_nosb:
2365 nfs_free_server(server);
2366out_err_noserver:
2367 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2368 return error;
f7b422b1 2369
54ceac45 2370error_splat_super:
cfbc0683
N		 2371 if (server && !s->s_root)
2372 bdi_unregister(&server->backing_dev_info);
2373error_splat_bdi:
6f5bbff9 2374 deactivate_locked_super(s);
54ceac45
DH		 2375 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2376 return error;
f7b422b1
DH		 2377}
2378
54ceac45
DH		 2379#ifdef CONFIG_NFS_V4
2380
f7b422b1 2381/*
54ceac45 2382 * Finish setting up a cloned NFS4 superblock
f7b422b1 2383 */
54ceac45
DH		 2384static void nfs4_clone_super(struct super_block *sb,
2385 const struct super_block *old_sb)
f7b422b1 2386{
54ceac45
DH		 2387 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2388 sb->s_blocksize = old_sb->s_blocksize;
2389 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2390 sb->s_time_gran = 1;
54ceac45
DH		 2391 sb->s_op = old_sb->s_op;
2392 nfs_initialise_sb(sb);
f7b422b1
DH		 2393}
2394
54ceac45
DH		 2395/*
2396 * Set up an NFS4 superblock
2397 */
2398static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2399{
54ceac45
DH		 2400 sb->s_time_gran = 1;
2401 sb->s_op = &nfs4_sops;
2402 nfs_initialise_sb(sb);
f7b422b1
DH		 2403}
2404
01c3f052
TM		 2405static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2406{
2407 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2408}
2409
7630c852
CL		 2410static int nfs4_validate_text_mount_data(void *options,
2411 struct nfs_parsed_mount_data *args,
2412 const char *dev_name)
2413{
2414 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2415
f5855fec 2416 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2417
2418 nfs_validate_transport_protocol(args);
2419
2420 nfs4_validate_mount_flags(args);
2421
2ecda72b
TM		 2422 if (args->version != 4) {
2423 dfprintk(MOUNT,
2424 "NFS4: Illegal mount version\n");
2425 return -EINVAL;
2426 }
2427
7630c852
CL		 2428 if (args->auth_flavor_len > 1) {
2429 dfprintk(MOUNT,
2430 "NFS4: Too many RPC auth flavours specified\n");
2431 return -EINVAL;
2432 }
2433
2434 if (args->client_address == NULL) {
2435 dfprintk(MOUNT,
2436 "NFS4: mount program didn't pass callback address\n");
2437 return -EINVAL;
2438 }
2439
2440 return nfs_parse_devname(dev_name,
2441 &args->nfs_server.hostname,
2442 NFS4_MAXNAMLEN,
2443 &args->nfs_server.export_path,
2444 NFS4_MAXPATHLEN);
2445}
2446
f0768ebd
CL		 2447/*
2448 * Validate NFSv4 mount options
2449 */
91ea40b9
TT		 2450static int nfs4_validate_mount_data(void *options,
2451 struct nfs_parsed_mount_data *args,
2452 const char *dev_name)
f0768ebd 2453{
4cfd74fc 2454 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2455 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2456 char *c;
2457
2458 if (data == NULL)
2459 goto out_no_data;
2460
2461 switch (data->version) {
2462 case 1:
4c568017
CL		 2463 if (data->host_addrlen > sizeof(args->nfs_server.address))
2464 goto out_no_address;
2465 if (data->host_addrlen == 0)
f0768ebd 2466 goto out_no_address;
4c568017 2467 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2468 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2469 return -EFAULT;
4cfd74fc 2470 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2471 goto out_no_address;
2472
6738b251
CL		 2473 if (data->auth_flavourlen) {
2474 if (data->auth_flavourlen > 1)
2475 goto out_inval_auth;
20c71f5e 2476 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2477 data->auth_flavours,
20c71f5e 2478 sizeof(args->auth_flavors[0])))
f0768ebd 2479 return -EFAULT;
f0768ebd
CL		 2480 }
2481
2482 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2483 if (IS_ERR(c))
2484 return PTR_ERR(c);
91ea40b9 2485 args->nfs_server.hostname = c;
f0768ebd
CL		 2486
2487 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2488 if (IS_ERR(c))
2489 return PTR_ERR(c);
91ea40b9
TT		 2490 args->nfs_server.export_path = c;
2491 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2492
2493 c = strndup_user(data->client_addr.data, 16);
2494 if (IS_ERR(c))
2495 return PTR_ERR(c);
91ea40b9
TT		 2496 args->client_address = c;
2497
2498 /*
2499 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2500 * can deal with.
2501 */
2502
2503 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2504 args->rsize = data->rsize;
2505 args->wsize = data->wsize;
2506 args->timeo = data->timeo;
2507 args->retrans = data->retrans;
2508 args->acregmin = data->acregmin;
2509 args->acregmax = data->acregmax;
2510 args->acdirmin = data->acdirmin;
2511 args->acdirmax = data->acdirmax;
2512 args->nfs_server.protocol = data->proto;
259875ef 2513 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2514
2515 break;
7630c852 2516 default:
91ea40b9 2517 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2518 return -EINVAL;
2519
4cfd74fc 2520 if (!nfs_verify_server_address(sap))
80071225 2521 return -EINVAL;
dc045898 2522
7630c852 2523 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2524 }
2525
2526 return 0;
2527
2528out_no_data:
2529 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2530 return -EINVAL;
2531
2532out_inval_auth:
2533 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2534 data->auth_flavourlen);
2535 return -EINVAL;
2536
2537out_no_address:
2538 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2539 return -EINVAL;
f0768ebd
CL		 2540}
2541
54ceac45 2542/*
c02d7adf 2543 * Get the superblock for the NFS4 root partition
54ceac45 2544 */
c02d7adf 2545static int nfs4_remote_get_sb(struct file_system_type *fs_type,
816724e6 2546 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2547{
c02d7adf 2548 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2549 struct super_block *s;
2550 struct nfs_server *server;
33852a1f 2551 struct nfs_fh *mntfh;
54ceac45 2552 struct dentry *mntroot;
75180df2 2553 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2554 struct nfs_sb_mountdata sb_mntdata = {
2555 .mntflags = flags,
2556 };
33852a1f
TM		 2557 int error = -ENOMEM;
2558
33852a1f
TM		 2559 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2560 if (data == NULL || mntfh == NULL)
2561 goto out_free_fh;
f7b422b1 2562
33852a1f 2563 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2564
54ceac45 2565 /* Get a volume representation */
33852a1f 2566 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2567 if (IS_ERR(server)) {
2568 error = PTR_ERR(server);
29eb981a 2569 goto out;
f7b422b1 2570 }
e89a5a43 2571 sb_mntdata.server = server;
f7b422b1 2572
75180df2
TM		 2573 if (server->flags & NFS4_MOUNT_UNSHARED)
2574 compare_super = NULL;
2575
54ceac45 2576 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2577 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2578 if (IS_ERR(s)) {
2579 error = PTR_ERR(s);
f7b422b1 2580 goto out_free;
816724e6
TM		 2581 }
2582
5dd3177a
TM		 2583 if (s->s_fs_info != server) {
2584 nfs_free_server(server);
2585 server = NULL;
fa799759
MS		 2586 } else {
2587 error = nfs_bdi_register(server);
2588 if (error)
cfbc0683 2589 goto error_splat_bdi;
5dd3177a
TM		 2590 }
2591
54ceac45
DH		 2592 if (!s->s_root) {
2593 /* initial superblock/root creation */
54ceac45 2594 nfs4_fill_super(s);
2df54806
DH		 2595 nfs_fscache_get_super_cookie(
2596 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2597 }
f7b422b1 2598
33852a1f 2599 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2600 if (IS_ERR(mntroot)) {
2601 error = PTR_ERR(mntroot);
2602 goto error_splat_super;
f7b422b1 2603 }
54ceac45 2604
33852a1f 2605 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2606 if (error)
2607 goto error_splat_root;
2608
f7b422b1 2609 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2610 mnt->mnt_sb = s;
2611 mnt->mnt_root = mntroot;
29eb981a
CL		 2612 error = 0;
2613
2614out:
33852a1f
TM		 2615 security_free_mnt_opts(&data->lsm_opts);
2616out_free_fh:
2617 kfree(mntfh);
29eb981a 2618 return error;
54ceac45 2619
f7b422b1 2620out_free:
54ceac45 2621 nfs_free_server(server);
29eb981a 2622 goto out;
54ceac45 2623
46c8ac74
EP		 2624error_splat_root:
2625 dput(mntroot);
54ceac45 2626error_splat_super:
cfbc0683
N		 2627 if (server && !s->s_root)
2628 bdi_unregister(&server->backing_dev_info);
2629error_splat_bdi:
6f5bbff9 2630 deactivate_locked_super(s);
29eb981a 2631 goto out;
f7b422b1
DH		 2632}
2633
c02d7adf
TM		 2634static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2635 int flags, void *data, const char *hostname)
2636{
2637 struct vfsmount *root_mnt;
2638 char *root_devname;
2639 size_t len;
2640
2641 len = strlen(hostname) + 3;
2642 root_devname = kmalloc(len, GFP_KERNEL);
2643 if (root_devname == NULL)
2644 return ERR_PTR(-ENOMEM);
2645 snprintf(root_devname, len, "%s:/", hostname);
2646 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2647 kfree(root_devname);
2648 return root_mnt;
2649}
2650
b88f8a54
TM		 2651static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2652{
2653 char *page = (char *) __get_free_page(GFP_KERNEL);
2654 char *devname, *tmp;
2655
2656 if (page == NULL)
2657 return;
2658 devname = nfs_path(path->mnt->mnt_devname,
2659 path->mnt->mnt_root, path->dentry,
2660 page, PAGE_SIZE);
cdd29ecf 2661 if (IS_ERR(devname))
b88f8a54
TM		 2662 goto out_freepage;
2663 tmp = kstrdup(devname, GFP_KERNEL);
2664 if (tmp == NULL)
2665 goto out_freepage;
2666 kfree(mnt->mnt_devname);
2667 mnt->mnt_devname = tmp;
2668out_freepage:
2669 free_page((unsigned long)page);
2670}
2671
c02d7adf
TM		 2672static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2673 const char *export_path, struct vfsmount *mnt_target)
2674{
04ffdbe2 2675 struct nameidata *nd = NULL;
a2770d86 2676 struct mnt_namespace *ns_private;
c02d7adf
TM		 2677 struct super_block *s;
2678 int ret;
2679
04ffdbe2
TM		 2680 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2681 if (nd == NULL)
2682 return -ENOMEM;
2683
a2770d86
LT		 2684 ns_private = create_mnt_ns(root_mnt);
2685 ret = PTR_ERR(ns_private);
2686 if (IS_ERR(ns_private))
2687 goto out_mntput;
2688
c02d7adf 2689 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
04ffdbe2 2690 export_path, LOOKUP_FOLLOW, nd);
c02d7adf 2691
a2770d86
LT		 2692 put_mnt_ns(ns_private);
2693
c02d7adf
TM		 2694 if (ret != 0)
2695 goto out_err;
2696
04ffdbe2 2697 s = nd->path.mnt->mnt_sb;
c02d7adf
TM		 2698 atomic_inc(&s->s_active);
2699 mnt_target->mnt_sb = s;
04ffdbe2 2700 mnt_target->mnt_root = dget(nd->path.dentry);
c02d7adf 2701
b88f8a54 2702 /* Correct the device pathname */
04ffdbe2 2703 nfs_fix_devname(&nd->path, mnt_target);
b88f8a54 2704
04ffdbe2
TM		 2705 path_put(&nd->path);
2706 kfree(nd);
c02d7adf
TM		 2707 down_write(&s->s_umount);
2708 return 0;
2709out_mntput:
2710 mntput(root_mnt);
2711out_err:
04ffdbe2 2712 kfree(nd);
c02d7adf
TM		 2713 return ret;
2714}
2715
a6fe23be
CL		 2716static int nfs4_try_mount(int flags, const char *dev_name,
2717 struct nfs_parsed_mount_data *data,
2718 struct vfsmount *mnt)
2719{
2720 char *export_path;
2721 struct vfsmount *root_mnt;
2722 int error;
2723
2724 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2725
2726 export_path = data->nfs_server.export_path;
2727 data->nfs_server.export_path = "/";
2728 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2729 data->nfs_server.hostname);
2730 data->nfs_server.export_path = export_path;
2731
2732 error = PTR_ERR(root_mnt);
2733 if (IS_ERR(root_mnt))
2734 goto out;
2735
2736 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2737
2738out:
2739 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2740 error != 0 ? " [error]" : "");
2741 return error;
2742}
2743
c02d7adf
TM		 2744/*
2745 * Get the superblock for an NFS4 mountpoint
2746 */
2747static int nfs4_get_sb(struct file_system_type *fs_type,
2748 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2749{
2750 struct nfs_parsed_mount_data *data;
c02d7adf
TM		 2751 int error = -ENOMEM;
2752
c5811dbd 2753 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2754 if (data == NULL)
2755 goto out_free_data;
2756
2757 /* Validate the mount data */
2758 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2759 if (error < 0)
2760 goto out;
2761
a6fe23be 2762 error = nfs4_try_mount(flags, dev_name, data, mnt);
c02d7adf
TM		 2763
2764out:
2765 kfree(data->client_address);
2766 kfree(data->nfs_server.export_path);
2767 kfree(data->nfs_server.hostname);
2768 kfree(data->fscache_uniq);
2769out_free_data:
2770 kfree(data);
2771 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2772 error != 0 ? " [error]" : "");
2773 return error;
2774}
2775
f7b422b1
DH		 2776static void nfs4_kill_super(struct super_block *sb)
2777{
2778 struct nfs_server *server = NFS_SB(sb);
2779
0f3e66c6 2780 dprintk("--> %s\n", __func__);
515d8611 2781 nfs_super_return_all_delegations(sb);
f7b422b1 2782 kill_anon_super(sb);
08734048 2783 nfs_fscache_release_super_cookie(sb);
54ceac45 2784 nfs_free_server(server);
0f3e66c6 2785 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2786}
2787
2788/*
54ceac45 2789 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2790 */
54ceac45
DH		 2791static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2792 const char *dev_name, void *raw_data,
2793 struct vfsmount *mnt)
f7b422b1 2794{
54ceac45
DH		 2795 struct nfs_clone_mount *data = raw_data;
2796 struct super_block *s;
2797 struct nfs_server *server;
2798 struct dentry *mntroot;
75180df2 2799 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2800 struct nfs_sb_mountdata sb_mntdata = {
2801 .mntflags = flags,
2802 };
54ceac45 2803 int error;
f7b422b1 2804
54ceac45 2805 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2806
54ceac45
DH		 2807 /* create a new volume representation */
2808 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2809 if (IS_ERR(server)) {
2810 error = PTR_ERR(server);
2811 goto out_err_noserver;
f7b422b1 2812 }
e89a5a43 2813 sb_mntdata.server = server;
f7b422b1 2814
75180df2
TM		 2815 if (server->flags & NFS4_MOUNT_UNSHARED)
2816 compare_super = NULL;
2817
54ceac45 2818 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2819 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2820 if (IS_ERR(s)) {
2821 error = PTR_ERR(s);
2822 goto out_err_nosb;
f7b422b1 2823 }
f7b422b1 2824
54ceac45
DH		 2825 if (s->s_fs_info != server) {
2826 nfs_free_server(server);
2827 server = NULL;
fa799759
MS		 2828 } else {
2829 error = nfs_bdi_register(server);
2830 if (error)
cfbc0683 2831 goto error_splat_bdi;
54ceac45 2832 }
f7b422b1 2833
54ceac45
DH		 2834 if (!s->s_root) {
2835 /* initial superblock/root creation */
54ceac45 2836 nfs4_clone_super(s, data->sb);
2df54806 2837 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2838 }
f7b422b1 2839
54ceac45
DH		 2840 mntroot = nfs4_get_root(s, data->fh);
2841 if (IS_ERR(mntroot)) {
2842 error = PTR_ERR(mntroot);
2843 goto error_splat_super;
2844 }
e9cc6c23
TM		 2845 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2846 dput(mntroot);
2847 error = -ESTALE;
2848 goto error_splat_super;
2849 }
f7b422b1 2850
54ceac45
DH		 2851 s->s_flags |= MS_ACTIVE;
2852 mnt->mnt_sb = s;
2853 mnt->mnt_root = mntroot;
2854
46c8ac74
EP		 2855 security_sb_clone_mnt_opts(data->sb, s);
2856
54ceac45
DH		 2857 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2858 return 0;
2859
2860out_err_nosb:
2861 nfs_free_server(server);
2862out_err_noserver:
2863 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2864 return error;
2865
2866error_splat_super:
cfbc0683
N		 2867 if (server && !s->s_root)
2868 bdi_unregister(&server->backing_dev_info);
2869error_splat_bdi:
6f5bbff9 2870 deactivate_locked_super(s);
54ceac45
DH		 2871 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2872 return error;
f7b422b1
DH		 2873}
2874
c02d7adf
TM		 2875static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2876 int flags, const char *dev_name, void *raw_data,
2877 struct vfsmount *mnt)
f7b422b1
DH		 2878{
2879 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2880 struct super_block *s;
2881 struct nfs_server *server;
2882 struct dentry *mntroot;
2883 struct nfs_fh mntfh;
75180df2 2884 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2885 struct nfs_sb_mountdata sb_mntdata = {
2886 .mntflags = flags,
2887 };
54ceac45
DH		 2888 int error;
2889
2890 dprintk("--> nfs4_referral_get_sb()\n");
2891
2892 /* create a new volume representation */
2893 server = nfs4_create_referral_server(data, &mntfh);
2894 if (IS_ERR(server)) {
2895 error = PTR_ERR(server);
2896 goto out_err_noserver;
2897 }
e89a5a43 2898 sb_mntdata.server = server;
54ceac45 2899
75180df2
TM		 2900 if (server->flags & NFS4_MOUNT_UNSHARED)
2901 compare_super = NULL;
2902
54ceac45 2903 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2904 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2905 if (IS_ERR(s)) {
2906 error = PTR_ERR(s);
2907 goto out_err_nosb;
2908 }
2909
2910 if (s->s_fs_info != server) {
2911 nfs_free_server(server);
2912 server = NULL;
fa799759
MS		 2913 } else {
2914 error = nfs_bdi_register(server);
2915 if (error)
cfbc0683 2916 goto error_splat_bdi;
54ceac45
DH		 2917 }
2918
2919 if (!s->s_root) {
2920 /* initial superblock/root creation */
54ceac45 2921 nfs4_fill_super(s);
2df54806 2922 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 2923 }
2924
f2d0d85e 2925 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2926 if (IS_ERR(mntroot)) {
2927 error = PTR_ERR(mntroot);
2928 goto error_splat_super;
2929 }
e9cc6c23
TM		 2930 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2931 dput(mntroot);
2932 error = -ESTALE;
2933 goto error_splat_super;
2934 }
54ceac45
DH		 2935
2936 s->s_flags |= MS_ACTIVE;
2937 mnt->mnt_sb = s;
2938 mnt->mnt_root = mntroot;
2939
46c8ac74
EP		 2940 security_sb_clone_mnt_opts(data->sb, s);
2941
54ceac45
DH		 2942 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2943 return 0;
2944
2945out_err_nosb:
2946 nfs_free_server(server);
2947out_err_noserver:
2948 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2949 return error;
2950
2951error_splat_super:
cfbc0683
N		 2952 if (server && !s->s_root)
2953 bdi_unregister(&server->backing_dev_info);
2954error_splat_bdi:
6f5bbff9 2955 deactivate_locked_super(s);
54ceac45
DH		 2956 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2957 return error;
f7b422b1
DH		 2958}
2959
c02d7adf
TM		 2960/*
2961 * Create an NFS4 server record on referral traversal
2962 */
2963static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2964 int flags, const char *dev_name, void *raw_data,
2965 struct vfsmount *mnt)
2966{
2967 struct nfs_clone_mount *data = raw_data;
2968 char *export_path;
2969 struct vfsmount *root_mnt;
2970 int error;
2971
2972 dprintk("--> nfs4_referral_get_sb()\n");
2973
2974 export_path = data->mnt_path;
2975 data->mnt_path = "/";
2976
2977 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2978 flags, data, data->hostname);
2979 data->mnt_path = export_path;
2980
2981 error = PTR_ERR(root_mnt);
2982 if (IS_ERR(root_mnt))
2983 goto out;
2984
2985 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2986out:
2987 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2988 error != 0 ? " [error]" : "");
2989 return error;
2990}
2991
54ceac45 2992#endif /* CONFIG_NFS_V4 */
Clone of davem's net-next-2.6 tree