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NFS4: Set security flavor default for NFSv4 mounts like other defaults
[deliverable/linux.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 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
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>
45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff
CL		 48#include <linux/in6.h>
49#include <net/ipv6.h>
d8e7748a 50#include <linux/netdevice.h>
f7b422b1 51#include <linux/nfs_xdr.h>
b5d5dfbd 52#include <linux/magic.h>
bf0fd768 53#include <linux/parser.h>
f7b422b1
DH		 54
55#include <asm/system.h>
56#include <asm/uaccess.h>
57
58#include "nfs4_fs.h"
59#include "callback.h"
60#include "delegation.h"
61#include "iostat.h"
62#include "internal.h"
63
64#define NFSDBG_FACILITY NFSDBG_VFS
65
bf0fd768
CL		 66enum {
67 /* Mount options that take no arguments */
68 Opt_soft, Opt_hard,
bf0fd768
CL		 69 Opt_posix, Opt_noposix,
70 Opt_cto, Opt_nocto,
71 Opt_ac, Opt_noac,
72 Opt_lock, Opt_nolock,
73 Opt_v2, Opt_v3,
2cf7ff7a 74 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 75 Opt_acl, Opt_noacl,
76 Opt_rdirplus, Opt_nordirplus,
75180df2 77 Opt_sharecache, Opt_nosharecache,
bf0fd768
CL		 78
79 /* Mount options that take integer arguments */
80 Opt_port,
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
85 Opt_actimeo,
86 Opt_namelen,
87 Opt_mountport,
e887cbcf 88 Opt_mountvers,
ad879cef 89 Opt_nfsvers,
bf0fd768
CL		 90
91 /* Mount options that take string arguments */
33832034 92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 93 Opt_addr, Opt_mountaddr, Opt_clientaddr,
bf0fd768
CL		 94
95 /* Mount options that are ignored */
96 Opt_userspace, Opt_deprecated,
97
98 Opt_err
99};
100
101static match_table_t nfs_mount_option_tokens = {
102 { Opt_userspace, "bg" },
103 { Opt_userspace, "fg" },
ecbb3845
CL		 104 { Opt_userspace, "retry=%s" },
105
bf0fd768
CL		 106 { Opt_soft, "soft" },
107 { Opt_hard, "hard" },
d33e4dfe
CL		 108 { Opt_deprecated, "intr" },
109 { Opt_deprecated, "nointr" },
bf0fd768
CL		 110 { Opt_posix, "posix" },
111 { Opt_noposix, "noposix" },
112 { Opt_cto, "cto" },
113 { Opt_nocto, "nocto" },
114 { Opt_ac, "ac" },
115 { Opt_noac, "noac" },
116 { Opt_lock, "lock" },
117 { Opt_nolock, "nolock" },
118 { Opt_v2, "v2" },
119 { Opt_v3, "v3" },
120 { Opt_udp, "udp" },
121 { Opt_tcp, "tcp" },
2cf7ff7a 122 { Opt_rdma, "rdma" },
bf0fd768
CL		 123 { Opt_acl, "acl" },
124 { Opt_noacl, "noacl" },
125 { Opt_rdirplus, "rdirplus" },
126 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 127 { Opt_sharecache, "sharecache" },
128 { Opt_nosharecache, "nosharecache" },
bf0fd768
CL		 129
130 { Opt_port, "port=%u" },
131 { Opt_rsize, "rsize=%u" },
132 { Opt_wsize, "wsize=%u" },
133 { Opt_bsize, "bsize=%u" },
134 { Opt_timeo, "timeo=%u" },
135 { Opt_retrans, "retrans=%u" },
136 { Opt_acregmin, "acregmin=%u" },
137 { Opt_acregmax, "acregmax=%u" },
138 { Opt_acdirmin, "acdirmin=%u" },
139 { Opt_acdirmax, "acdirmax=%u" },
140 { Opt_actimeo, "actimeo=%u" },
bf0fd768
CL		 141 { Opt_namelen, "namlen=%u" },
142 { Opt_mountport, "mountport=%u" },
bf0fd768 143 { Opt_mountvers, "mountvers=%u" },
bf0fd768
CL		 144 { Opt_nfsvers, "nfsvers=%u" },
145 { Opt_nfsvers, "vers=%u" },
146
147 { Opt_sec, "sec=%s" },
148 { Opt_proto, "proto=%s" },
149 { Opt_mountproto, "mountproto=%s" },
150 { Opt_addr, "addr=%s" },
151 { Opt_clientaddr, "clientaddr=%s" },
33832034 152 { Opt_mounthost, "mounthost=%s" },
0ac83779 153 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768
CL		 154
155 { Opt_err, NULL }
156};
157
158enum {
2cf7ff7a 159 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 160
161 Opt_xprt_err
162};
163
164static match_table_t nfs_xprt_protocol_tokens = {
165 { Opt_xprt_udp, "udp" },
166 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 167 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 168
169 { Opt_xprt_err, NULL }
170};
171
172enum {
173 Opt_sec_none, Opt_sec_sys,
174 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
175 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
176 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
177
178 Opt_sec_err
179};
180
181static match_table_t nfs_secflavor_tokens = {
182 { Opt_sec_none, "none" },
183 { Opt_sec_none, "null" },
184 { Opt_sec_sys, "sys" },
185
186 { Opt_sec_krb5, "krb5" },
187 { Opt_sec_krb5i, "krb5i" },
188 { Opt_sec_krb5p, "krb5p" },
189
190 { Opt_sec_lkey, "lkey" },
191 { Opt_sec_lkeyi, "lkeyi" },
192 { Opt_sec_lkeyp, "lkeyp" },
193
8d042218
OK		 194 { Opt_sec_spkm, "spkm3" },
195 { Opt_sec_spkmi, "spkm3i" },
196 { Opt_sec_spkmp, "spkm3p" },
197
bf0fd768
CL		 198 { Opt_sec_err, NULL }
199};
200
201
42faad99 202static void nfs_umount_begin(struct super_block *);
816724e6 203static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 204static int nfs_show_options(struct seq_file *, struct vfsmount *);
205static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 206static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 207static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 208 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1 209static void nfs_kill_super(struct super_block *);
ef818a28 210static void nfs_put_super(struct super_block *);
48b605f8 211static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 212
213static struct file_system_type nfs_fs_type = {
214 .owner = THIS_MODULE,
215 .name = "nfs",
216 .get_sb = nfs_get_sb,
217 .kill_sb = nfs_kill_super,
349457cc 218 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 219};
220
54ceac45 221struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 222 .owner = THIS_MODULE,
223 .name = "nfs",
54ceac45 224 .get_sb = nfs_xdev_get_sb,
f7b422b1 225 .kill_sb = nfs_kill_super,
349457cc 226 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 227};
228
ee9b6d61 229static const struct super_operations nfs_sops = {
f7b422b1
DH		 230 .alloc_inode = nfs_alloc_inode,
231 .destroy_inode = nfs_destroy_inode,
232 .write_inode = nfs_write_inode,
ef818a28 233 .put_super = nfs_put_super,
f7b422b1
DH		 234 .statfs = nfs_statfs,
235 .clear_inode = nfs_clear_inode,
236 .umount_begin = nfs_umount_begin,
237 .show_options = nfs_show_options,
238 .show_stats = nfs_show_stats,
48b605f8 239 .remount_fs = nfs_remount,
f7b422b1
DH		 240};
241
242#ifdef CONFIG_NFS_V4
816724e6
TM		 243static int nfs4_get_sb(struct file_system_type *fs_type,
244 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 245static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
247static int nfs4_referral_get_sb(struct file_system_type *fs_type,
248 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 249static void nfs4_kill_super(struct super_block *sb);
250
251static struct file_system_type nfs4_fs_type = {
252 .owner = THIS_MODULE,
253 .name = "nfs4",
254 .get_sb = nfs4_get_sb,
255 .kill_sb = nfs4_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 nfs4_xdev_fs_type = {
f7b422b1
DH		 260 .owner = THIS_MODULE,
261 .name = "nfs4",
54ceac45 262 .get_sb = nfs4_xdev_get_sb,
f7b422b1 263 .kill_sb = nfs4_kill_super,
349457cc 264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 265};
266
54ceac45 267struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 268 .owner = THIS_MODULE,
269 .name = "nfs4",
54ceac45 270 .get_sb = nfs4_referral_get_sb,
f7b422b1 271 .kill_sb = nfs4_kill_super,
349457cc 272 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 273};
274
ee9b6d61 275static const struct super_operations nfs4_sops = {
f7b422b1
DH		 276 .alloc_inode = nfs_alloc_inode,
277 .destroy_inode = nfs_destroy_inode,
278 .write_inode = nfs_write_inode,
279 .statfs = nfs_statfs,
280 .clear_inode = nfs4_clear_inode,
281 .umount_begin = nfs_umount_begin,
282 .show_options = nfs_show_options,
283 .show_stats = nfs_show_stats,
48b605f8 284 .remount_fs = nfs_remount,
f7b422b1
DH		 285};
286#endif
287
8e1f936b
RR		 288static struct shrinker acl_shrinker = {
289 .shrink = nfs_access_cache_shrinker,
290 .seeks = DEFAULT_SEEKS,
291};
979df72e 292
f7b422b1
DH		 293/*
294 * Register the NFS filesystems
295 */
296int __init register_nfs_fs(void)
297{
298 int ret;
299
300 ret = register_filesystem(&nfs_fs_type);
301 if (ret < 0)
302 goto error_0;
303
f7b422b1
DH		 304 ret = nfs_register_sysctl();
305 if (ret < 0)
306 goto error_1;
89a09141 307#ifdef CONFIG_NFS_V4
f7b422b1
DH		 308 ret = register_filesystem(&nfs4_fs_type);
309 if (ret < 0)
310 goto error_2;
311#endif
8e1f936b 312 register_shrinker(&acl_shrinker);
f7b422b1
DH		 313 return 0;
314
315#ifdef CONFIG_NFS_V4
316error_2:
317 nfs_unregister_sysctl();
89a09141 318#endif
f7b422b1
DH		 319error_1:
320 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 321error_0:
322 return ret;
323}
324
325/*
326 * Unregister the NFS filesystems
327 */
328void __exit unregister_nfs_fs(void)
329{
8e1f936b 330 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 331#ifdef CONFIG_NFS_V4
332 unregister_filesystem(&nfs4_fs_type);
f7b422b1 333#endif
49af7ee1 334 nfs_unregister_sysctl();
f7b422b1
DH		 335 unregister_filesystem(&nfs_fs_type);
336}
337
ef818a28
SD		 338void nfs_sb_active(struct nfs_server *server)
339{
340 atomic_inc(&server->active);
341}
342
343void nfs_sb_deactive(struct nfs_server *server)
344{
345 if (atomic_dec_and_test(&server->active))
346 wake_up(&server->active_wq);
347}
348
349static void nfs_put_super(struct super_block *sb)
350{
351 struct nfs_server *server = NFS_SB(sb);
352 /*
353 * Make sure there are no outstanding ops to this server.
354 * If so, wait for them to finish before allowing the
355 * unmount to continue.
356 */
357 wait_event(server->active_wq, atomic_read(&server->active) == 0);
358}
359
f7b422b1
DH		 360/*
361 * Deliver file system statistics to userspace
362 */
816724e6 363static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 364{
0c7d90cf 365 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 366 unsigned char blockbits;
367 unsigned long blockres;
0c7d90cf 368 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 369 struct nfs_fattr fattr;
370 struct nfs_fsstat res = {
371 .fattr = &fattr,
372 };
373 int error;
374
375 lock_kernel();
376
8fa5c000 377 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 378 if (error < 0)
379 goto out_err;
1a0ba9ae 380 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 381
382 /*
383 * Current versions of glibc do not correctly handle the
384 * case where f_frsize != f_bsize. Eventually we want to
385 * report the value of wtmult in this field.
386 */
0c7d90cf 387 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 388
389 /*
390 * On most *nix systems, f_blocks, f_bfree, and f_bavail
391 * are reported in units of f_frsize. Linux hasn't had
392 * an f_frsize field in its statfs struct until recently,
393 * thus historically Linux's sys_statfs reports these
394 * fields in units of f_bsize.
395 */
0c7d90cf
DH		 396 buf->f_bsize = dentry->d_sb->s_blocksize;
397 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 398 blockres = (1 << blockbits) - 1;
399 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
400 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
401 buf->f_bavail = (res.abytes + blockres) >> blockbits;
402
403 buf->f_files = res.tfiles;
404 buf->f_ffree = res.afiles;
405
406 buf->f_namelen = server->namelen;
1a0ba9ae 407
f7b422b1
DH		 408 unlock_kernel();
409 return 0;
410
411 out_err:
3110ff80 412 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae
AA		 413 unlock_kernel();
414 return error;
f7b422b1
DH		 415}
416
7d4e2747
DH		 417/*
418 * Map the security flavour number to a name
419 */
81039f1f
TM		 420static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
421{
7d4e2747 422 static const struct {
81039f1f
TM		 423 rpc_authflavor_t flavour;
424 const char *str;
425 } sec_flavours[] = {
426 { RPC_AUTH_NULL, "null" },
427 { RPC_AUTH_UNIX, "sys" },
428 { RPC_AUTH_GSS_KRB5, "krb5" },
429 { RPC_AUTH_GSS_KRB5I, "krb5i" },
430 { RPC_AUTH_GSS_KRB5P, "krb5p" },
431 { RPC_AUTH_GSS_LKEY, "lkey" },
432 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
433 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
434 { RPC_AUTH_GSS_SPKM, "spkm" },
435 { RPC_AUTH_GSS_SPKMI, "spkmi" },
436 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 437 { UINT_MAX, "unknown" }
81039f1f
TM		 438 };
439 int i;
440
4d81cd16 441 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 442 if (sec_flavours[i].flavour == flavour)
443 break;
444 }
445 return sec_flavours[i].str;
446}
447
82d101d5
CL		 448static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
449 int showdefaults)
450{
451 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
452
453 switch (sap->sa_family) {
454 case AF_INET: {
455 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
456 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
457 NIPQUAD(sin->sin_addr.s_addr));
458 break;
459 }
460 case AF_INET6: {
461 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
462 seq_printf(m, ",mountaddr=" NIP6_FMT,
463 NIP6(sin6->sin6_addr));
464 break;
465 }
466 default:
467 if (showdefaults)
468 seq_printf(m, ",mountaddr=unspecified");
469 }
470
471 if (nfss->mountd_version || showdefaults)
472 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
473 if (nfss->mountd_port || showdefaults)
474 seq_printf(m, ",mountport=%u", nfss->mountd_port);
475
476 switch (nfss->mountd_protocol) {
477 case IPPROTO_UDP:
478 seq_printf(m, ",mountproto=udp");
479 break;
480 case IPPROTO_TCP:
481 seq_printf(m, ",mountproto=tcp");
482 break;
483 default:
484 if (showdefaults)
485 seq_printf(m, ",mountproto=auto");
486 }
487}
488
f7b422b1
DH		 489/*
490 * Describe the mount options in force on this server representation
491 */
82d101d5
CL		 492static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
493 int showdefaults)
f7b422b1 494{
509de811 495 static const struct proc_nfs_info {
f7b422b1 496 int flag;
509de811
DH		 497 const char *str;
498 const char *nostr;
f7b422b1
DH		 499 } nfs_info[] = {
500 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5
CL		 501 { NFS_MOUNT_INTR, ",intr", ",nointr" },
502 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 503 { NFS_MOUNT_NOCTO, ",nocto", "" },
504 { NFS_MOUNT_NOAC, ",noac", "" },
505 { NFS_MOUNT_NONLM, ",nolock", "" },
506 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 507 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
75180df2 508 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
f7b422b1
DH		 509 { 0, NULL, NULL }
510 };
509de811 511 const struct proc_nfs_info *nfs_infop;
8fa5c000 512 struct nfs_client *clp = nfss->nfs_client;
82d101d5 513 u32 version = clp->rpc_ops->version;
f7b422b1 514
82d101d5 515 seq_printf(m, ",vers=%u", version);
2d767432
CL		 516 seq_printf(m, ",rsize=%u", nfss->rsize);
517 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 518 if (nfss->bsize != 0)
519 seq_printf(m, ",bsize=%u", nfss->bsize);
520 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 521 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 522 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 523 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 524 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 525 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 526 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 527 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 528 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 529 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
530 if (nfss->flags & nfs_infop->flag)
531 seq_puts(m, nfs_infop->str);
532 else
533 seq_puts(m, nfs_infop->nostr);
534 }
56928edd
TT		 535 seq_printf(m, ",proto=%s",
536 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
82d101d5
CL		 537 if (version == 4) {
538 if (nfss->port != NFS_PORT)
539 seq_printf(m, ",port=%u", nfss->port);
540 } else
541 if (nfss->port)
542 seq_printf(m, ",port=%u", nfss->port);
543
33170233
TM		 544 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
545 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 546 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 547
548 if (version != 4)
549 nfs_show_mountd_options(m, nfss, showdefaults);
550
551#ifdef CONFIG_NFS_V4
552 if (clp->rpc_ops->version == 4)
553 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
554#endif
f7b422b1
DH		 555}
556
557/*
558 * Describe the mount options on this VFS mountpoint
559 */
560static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
561{
562 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
563
564 nfs_show_mount_options(m, nfss, 0);
565
5d8515ca
CL		 566 seq_printf(m, ",addr=%s",
567 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
568 RPC_DISPLAY_ADDR));
f7b422b1
DH		 569
570 return 0;
571}
572
573/*
574 * Present statistical information for this VFS mountpoint
575 */
576static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
577{
578 int i, cpu;
579 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
580 struct rpc_auth *auth = nfss->client->cl_auth;
581 struct nfs_iostats totals = { };
582
583 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
584
585 /*
586 * Display all mount option settings
587 */
588 seq_printf(m, "\n\topts:\t");
589 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
590 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
591 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
592 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
593 nfs_show_mount_options(m, nfss, 1);
594
595 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
596
597 seq_printf(m, "\n\tcaps:\t");
598 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 599 seq_printf(m, ",wtmult=%u", nfss->wtmult);
600 seq_printf(m, ",dtsize=%u", nfss->dtsize);
601 seq_printf(m, ",bsize=%u", nfss->bsize);
602 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 603
604#ifdef CONFIG_NFS_V4
40c55319 605 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 606 seq_printf(m, "\n\tnfsv4:\t");
607 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
608 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
609 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
610 }
611#endif
612
613 /*
614 * Display security flavor in effect for this mount
615 */
2d767432 616 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 617 if (auth->au_flavor)
2d767432 618 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 619
620 /*
621 * Display superblock I/O counters
622 */
623 for_each_possible_cpu(cpu) {
624 struct nfs_iostats *stats;
625
626 preempt_disable();
627 stats = per_cpu_ptr(nfss->io_stats, cpu);
628
629 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
630 totals.events[i] += stats->events[i];
631 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
632 totals.bytes[i] += stats->bytes[i];
633
634 preempt_enable();
635 }
636
637 seq_printf(m, "\n\tevents:\t");
638 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
639 seq_printf(m, "%lu ", totals.events[i]);
640 seq_printf(m, "\n\tbytes:\t");
641 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
642 seq_printf(m, "%Lu ", totals.bytes[i]);
643 seq_printf(m, "\n");
644
645 rpc_print_iostats(m, nfss->client);
646
647 return 0;
648}
649
650/*
651 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 652 * in response to xdev traversals and referrals
f7b422b1 653 */
42faad99 654static void nfs_umount_begin(struct super_block *sb)
f7b422b1 655{
42faad99 656 struct nfs_server *server = NFS_SB(sb);
fc6ae3cf
TM		 657 struct rpc_clnt *rpc;
658
fc6ae3cf
TM		 659 /* -EIO all pending I/O */
660 rpc = server->client_acl;
661 if (!IS_ERR(rpc))
662 rpc_killall_tasks(rpc);
663 rpc = server->client;
664 if (!IS_ERR(rpc))
665 rpc_killall_tasks(rpc);
f7b422b1
DH		 666}
667
04dcd6e3
CL		 668/*
669 * Set the port number in an address. Be agnostic about the address family.
670 */
671static void nfs_set_port(struct sockaddr *sap, unsigned short port)
672{
673 switch (sap->sa_family) {
674 case AF_INET: {
675 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
676 ap->sin_port = htons(port);
677 break;
678 }
679 case AF_INET6: {
680 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
681 ap->sin6_port = htons(port);
682 break;
683 }
684 }
685}
686
fc50d58f 687/*
cdcd7f9a
CL		 688 * Sanity-check a server address provided by the mount command.
689 *
690 * Address family must be initialized, and address must not be
691 * the ANY address for that family.
fc50d58f
CL		 692 */
693static int nfs_verify_server_address(struct sockaddr *addr)
694{
695 switch (addr->sa_family) {
696 case AF_INET: {
cdcd7f9a 697 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 698 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 699 }
700 case AF_INET6: {
701 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
702 return !ipv6_addr_any(sa);
fc50d58f
CL		 703 }
704 }
705
706 return 0;
707}
708
ce3b7e19
CL		 709static void nfs_parse_ipv4_address(char *string, size_t str_len,
710 struct sockaddr *sap, size_t *addr_len)
9412b927 711{
ce3b7e19
CL		 712 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
713 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
9412b927 714
ce3b7e19
CL		 715 if (str_len <= INET_ADDRSTRLEN) {
716 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
717 (int)str_len, string);
718
719 sin->sin_family = AF_INET;
720 *addr_len = sizeof(*sin);
721 if (in4_pton(string, str_len, addr, '\0', NULL))
3c7c7e48 722 return;
ce3b7e19
CL		 723 }
724
725 sap->sa_family = AF_UNSPEC;
726 *addr_len = 0;
727}
728
d8e7748a
CL		 729#define IPV6_SCOPE_DELIMITER '%'
730
ce3b7e19 731#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
d8e7748a
CL		 732static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
733 const char *delim,
734 struct sockaddr_in6 *sin6)
735{
736 char *p;
737 size_t len;
738
739 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
740 return ;
741 if (*delim != IPV6_SCOPE_DELIMITER)
742 return;
743
744 len = (string + str_len) - delim - 1;
745 p = kstrndup(delim + 1, len, GFP_KERNEL);
746 if (p) {
747 unsigned long scope_id = 0;
748 struct net_device *dev;
749
750 dev = dev_get_by_name(&init_net, p);
751 if (dev != NULL) {
752 scope_id = dev->ifindex;
753 dev_put(dev);
754 } else {
755 /* scope_id is set to zero on error */
756 strict_strtoul(p, 10, &scope_id);
757 }
758
759 kfree(p);
760 sin6->sin6_scope_id = scope_id;
761 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
762 }
763}
764
ce3b7e19
CL		 765static void nfs_parse_ipv6_address(char *string, size_t str_len,
766 struct sockaddr *sap, size_t *addr_len)
767{
768 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
769 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
d8e7748a 770 const char *delim;
ce3b7e19
CL		 771
772 if (str_len <= INET6_ADDRSTRLEN) {
773 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
774 (int)str_len, string);
3c7c7e48 775
ce3b7e19
CL		 776 sin6->sin6_family = AF_INET6;
777 *addr_len = sizeof(*sin6);
d8e7748a
CL		 778 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
779 nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
3c7c7e48 780 return;
d8e7748a 781 }
3c7c7e48 782 }
9412b927
CL		 783
784 sap->sa_family = AF_UNSPEC;
ce3b7e19
CL		 785 *addr_len = 0;
786}
787#else
788static void nfs_parse_ipv6_address(char *string, size_t str_len,
789 struct sockaddr *sap, size_t *addr_len)
790{
791 sap->sa_family = AF_UNSPEC;
792 *addr_len = 0;
793}
794#endif
795
796/*
797 * Construct a sockaddr based on the contents of a string that contains
798 * an IP address in presentation format.
799 *
800 * If there is a problem constructing the new sockaddr, set the address
801 * family to AF_UNSPEC.
802 */
803static void nfs_parse_ip_address(char *string, size_t str_len,
804 struct sockaddr *sap, size_t *addr_len)
805{
806 unsigned int i, colons;
807
808 colons = 0;
809 for (i = 0; i < str_len; i++)
810 if (string[i] == ':')
811 colons++;
812
813 if (colons >= 2)
814 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
815 else
816 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
9412b927
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.
858 *
dd07c947 859 * The flavor_len setting is for v4 mounts.
01060c89
CL		 860 */
861static int nfs_parse_security_flavors(char *value,
862 struct nfs_parsed_mount_data *mnt)
863{
864 substring_t args[MAX_OPT_ARGS];
865
866 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
867
868 switch (match_token(value, nfs_secflavor_tokens, args)) {
869 case Opt_sec_none:
01060c89
CL		 870 mnt->auth_flavor_len = 0;
871 mnt->auth_flavors[0] = RPC_AUTH_NULL;
872 break;
873 case Opt_sec_sys:
01060c89
CL		 874 mnt->auth_flavor_len = 0;
875 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
876 break;
877 case Opt_sec_krb5:
01060c89
CL		 878 mnt->auth_flavor_len = 1;
879 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
880 break;
881 case Opt_sec_krb5i:
01060c89
CL		 882 mnt->auth_flavor_len = 1;
883 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
884 break;
885 case Opt_sec_krb5p:
01060c89
CL		 886 mnt->auth_flavor_len = 1;
887 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
888 break;
889 case Opt_sec_lkey:
01060c89
CL		 890 mnt->auth_flavor_len = 1;
891 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
892 break;
893 case Opt_sec_lkeyi:
01060c89
CL		 894 mnt->auth_flavor_len = 1;
895 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
896 break;
897 case Opt_sec_lkeyp:
01060c89
CL		 898 mnt->auth_flavor_len = 1;
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
900 break;
901 case Opt_sec_spkm:
01060c89
CL		 902 mnt->auth_flavor_len = 1;
903 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
904 break;
905 case Opt_sec_spkmi:
01060c89
CL		 906 mnt->auth_flavor_len = 1;
907 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
908 break;
909 case Opt_sec_spkmp:
01060c89
CL		 910 mnt->auth_flavor_len = 1;
911 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
912 break;
913 default:
914 return 0;
915 }
916
917 return 1;
918}
919
bf0fd768
CL		 920/*
921 * Error-check and convert a string of mount options from user space into
922 * a data structure
923 */
924static int nfs_parse_mount_options(char *raw,
925 struct nfs_parsed_mount_data *mnt)
926{
f9c3a380 927 char *p, *string, *secdata;
f9c3a380 928 int rc;
bf0fd768
CL		 929
930 if (!raw) {
931 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
932 return 1;
933 }
934 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
935
f9c3a380
EP		 936 secdata = alloc_secdata();
937 if (!secdata)
938 goto out_nomem;
939
940 rc = security_sb_copy_data(raw, secdata);
941 if (rc)
942 goto out_security_failure;
943
944 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
945 if (rc)
946 goto out_security_failure;
947
948 free_secdata(secdata);
949
bf0fd768
CL		 950 while ((p = strsep(&raw, ",")) != NULL) {
951 substring_t args[MAX_OPT_ARGS];
952 int option, token;
953
954 if (!*p)
955 continue;
956
957 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
958
959 token = match_token(p, nfs_mount_option_tokens, args);
960 switch (token) {
961 case Opt_soft:
962 mnt->flags |= NFS_MOUNT_SOFT;
963 break;
964 case Opt_hard:
965 mnt->flags &= ~NFS_MOUNT_SOFT;
966 break;
bf0fd768
CL		 967 case Opt_posix:
968 mnt->flags |= NFS_MOUNT_POSIX;
969 break;
970 case Opt_noposix:
971 mnt->flags &= ~NFS_MOUNT_POSIX;
972 break;
973 case Opt_cto:
974 mnt->flags &= ~NFS_MOUNT_NOCTO;
975 break;
976 case Opt_nocto:
977 mnt->flags |= NFS_MOUNT_NOCTO;
978 break;
979 case Opt_ac:
980 mnt->flags &= ~NFS_MOUNT_NOAC;
981 break;
982 case Opt_noac:
983 mnt->flags |= NFS_MOUNT_NOAC;
984 break;
985 case Opt_lock:
986 mnt->flags &= ~NFS_MOUNT_NONLM;
987 break;
988 case Opt_nolock:
989 mnt->flags |= NFS_MOUNT_NONLM;
990 break;
991 case Opt_v2:
992 mnt->flags &= ~NFS_MOUNT_VER3;
993 break;
994 case Opt_v3:
995 mnt->flags |= NFS_MOUNT_VER3;
996 break;
997 case Opt_udp:
998 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 999 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1000 break;
1001 case Opt_tcp:
1002 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1003 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1004 break;
2cf7ff7a
TT		 1005 case Opt_rdma:
1006 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1007 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
2cf7ff7a 1008 break;
bf0fd768
CL		 1009 case Opt_acl:
1010 mnt->flags &= ~NFS_MOUNT_NOACL;
1011 break;
1012 case Opt_noacl:
1013 mnt->flags |= NFS_MOUNT_NOACL;
1014 break;
1015 case Opt_rdirplus:
1016 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1017 break;
1018 case Opt_nordirplus:
1019 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1020 break;
75180df2
TM		 1021 case Opt_sharecache:
1022 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1023 break;
1024 case Opt_nosharecache:
1025 mnt->flags |= NFS_MOUNT_UNSHARED;
1026 break;
bf0fd768
CL		 1027
1028 case Opt_port:
1029 if (match_int(args, &option))
1030 return 0;
1031 if (option < 0 || option > 65535)
1032 return 0;
f22d6d79 1033 mnt->nfs_server.port = option;
bf0fd768
CL		 1034 break;
1035 case Opt_rsize:
1036 if (match_int(args, &mnt->rsize))
1037 return 0;
1038 break;
1039 case Opt_wsize:
1040 if (match_int(args, &mnt->wsize))
1041 return 0;
1042 break;
1043 case Opt_bsize:
1044 if (match_int(args, &option))
1045 return 0;
1046 if (option < 0)
1047 return 0;
1048 mnt->bsize = option;
1049 break;
1050 case Opt_timeo:
1051 if (match_int(args, &mnt->timeo))
1052 return 0;
1053 break;
1054 case Opt_retrans:
1055 if (match_int(args, &mnt->retrans))
1056 return 0;
1057 break;
1058 case Opt_acregmin:
1059 if (match_int(args, &mnt->acregmin))
1060 return 0;
1061 break;
1062 case Opt_acregmax:
1063 if (match_int(args, &mnt->acregmax))
1064 return 0;
1065 break;
1066 case Opt_acdirmin:
1067 if (match_int(args, &mnt->acdirmin))
1068 return 0;
1069 break;
1070 case Opt_acdirmax:
1071 if (match_int(args, &mnt->acdirmax))
1072 return 0;
1073 break;
1074 case Opt_actimeo:
1075 if (match_int(args, &option))
1076 return 0;
1077 if (option < 0)
1078 return 0;
1079 mnt->acregmin =
1080 mnt->acregmax =
1081 mnt->acdirmin =
1082 mnt->acdirmax = option;
1083 break;
1084 case Opt_namelen:
1085 if (match_int(args, &mnt->namlen))
1086 return 0;
1087 break;
1088 case Opt_mountport:
1089 if (match_int(args, &option))
1090 return 0;
1091 if (option < 0 || option > 65535)
1092 return 0;
1093 mnt->mount_server.port = option;
1094 break;
bf0fd768
CL		 1095 case Opt_mountvers:
1096 if (match_int(args, &option))
1097 return 0;
1098 if (option < 0)
1099 return 0;
1100 mnt->mount_server.version = option;
1101 break;
bf0fd768
CL		 1102 case Opt_nfsvers:
1103 if (match_int(args, &option))
1104 return 0;
1105 switch (option) {
1106 case 2:
1107 mnt->flags &= ~NFS_MOUNT_VER3;
1108 break;
1109 case 3:
1110 mnt->flags |= NFS_MOUNT_VER3;
1111 break;
1112 default:
1113 goto out_unrec_vers;
1114 }
1115 break;
1116
1117 case Opt_sec:
1118 string = match_strdup(args);
1119 if (string == NULL)
1120 goto out_nomem;
01060c89 1121 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1122 kfree(string);
01060c89 1123 if (!rc)
bf0fd768 1124 goto out_unrec_sec;
bf0fd768
CL		 1125 break;
1126 case Opt_proto:
1127 string = match_strdup(args);
1128 if (string == NULL)
1129 goto out_nomem;
1130 token = match_token(string,
1131 nfs_xprt_protocol_tokens, args);
1132 kfree(string);
1133
1134 switch (token) {
fdb66ff4 1135 case Opt_xprt_udp:
bf0fd768 1136 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1137 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1138 break;
fdb66ff4 1139 case Opt_xprt_tcp:
bf0fd768 1140 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1141 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1142 break;
2cf7ff7a
TT		 1143 case Opt_xprt_rdma:
1144 /* vector side protocols to TCP */
1145 mnt->flags |= NFS_MOUNT_TCP;
1146 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
2cf7ff7a 1147 break;
bf0fd768
CL		 1148 default:
1149 goto out_unrec_xprt;
1150 }
1151 break;
1152 case Opt_mountproto:
1153 string = match_strdup(args);
1154 if (string == NULL)
1155 goto out_nomem;
1156 token = match_token(string,
1157 nfs_xprt_protocol_tokens, args);
1158 kfree(string);
1159
1160 switch (token) {
fdb66ff4 1161 case Opt_xprt_udp:
0896a725 1162 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1163 break;
fdb66ff4 1164 case Opt_xprt_tcp:
0896a725 1165 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1166 break;
2cf7ff7a 1167 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768
CL		 1168 default:
1169 goto out_unrec_xprt;
1170 }
1171 break;
1172 case Opt_addr:
1173 string = match_strdup(args);
1174 if (string == NULL)
1175 goto out_nomem;
ce3b7e19
CL		 1176 nfs_parse_ip_address(string, strlen(string),
1177 (struct sockaddr *)
1178 &mnt->nfs_server.address,
1179 &mnt->nfs_server.addrlen);
bf0fd768
CL		 1180 kfree(string);
1181 break;
1182 case Opt_clientaddr:
1183 string = match_strdup(args);
1184 if (string == NULL)
1185 goto out_nomem;
fc601477 1186 kfree(mnt->client_address);
bf0fd768
CL		 1187 mnt->client_address = string;
1188 break;
33832034
CL		 1189 case Opt_mounthost:
1190 string = match_strdup(args);
1191 if (string == NULL)
1192 goto out_nomem;
fc601477 1193 kfree(mnt->mount_server.hostname);
33832034
CL		 1194 mnt->mount_server.hostname = string;
1195 break;
0ac83779 1196 case Opt_mountaddr:
bf0fd768
CL		 1197 string = match_strdup(args);
1198 if (string == NULL)
1199 goto out_nomem;
ce3b7e19
CL		 1200 nfs_parse_ip_address(string, strlen(string),
1201 (struct sockaddr *)
1202 &mnt->mount_server.address,
1203 &mnt->mount_server.addrlen);
bf0fd768
CL		 1204 kfree(string);
1205 break;
1206
1207 case Opt_userspace:
1208 case Opt_deprecated:
d33e4dfe
CL		 1209 dfprintk(MOUNT, "NFS: ignoring mount option "
1210 "'%s'\n", p);
bf0fd768
CL		 1211 break;
1212
1213 default:
1214 goto out_unknown;
1215 }
1216 }
1217
1218 return 1;
1219
1220out_nomem:
1221 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1222 return 0;
f9c3a380
EP		 1223out_security_failure:
1224 free_secdata(secdata);
1225 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1226 return 0;
bf0fd768
CL		 1227out_unrec_vers:
1228 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1229 return 0;
1230
1231out_unrec_xprt:
1232 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1233 return 0;
1234
1235out_unrec_sec:
1236 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1237 return 0;
1238
1239out_unknown:
1240 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1241 return 0;
1242}
1243
0076d7b7
CL		 1244/*
1245 * Use the remote server's MOUNT service to request the NFS file handle
1246 * corresponding to the provided path.
1247 */
1248static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1249 struct nfs_fh *root_fh)
1250{
4c568017 1251 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
33832034 1252 char *hostname;
4c568017 1253 int status;
0076d7b7
CL		 1254
1255 if (args->mount_server.version == 0) {
1256 if (args->flags & NFS_MOUNT_VER3)
1257 args->mount_server.version = NFS_MNT3_VERSION;
1258 else
1259 args->mount_server.version = NFS_MNT_VERSION;
1260 }
1261
33832034
CL		 1262 if (args->mount_server.hostname)
1263 hostname = args->mount_server.hostname;
1264 else
1265 hostname = args->nfs_server.hostname;
1266
0076d7b7
CL		 1267 /*
1268 * Construct the mount server's address.
1269 */
4c568017
CL		 1270 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1271 memcpy(sap, &args->nfs_server.address,
1272 args->nfs_server.addrlen);
1273 args->mount_server.addrlen = args->nfs_server.addrlen;
1274 }
1275
aad70007
JL		 1276 /*
1277 * autobind will be used if mount_server.port == 0
1278 */
4c568017 1279 nfs_set_port(sap, args->mount_server.port);
0076d7b7
CL		 1280
1281 /*
1282 * Now ask the mount server to map our export path
1283 * to a file handle.
1284 */
4c568017
CL		 1285 status = nfs_mount(sap,
1286 args->mount_server.addrlen,
33832034 1287 hostname,
0076d7b7
CL		 1288 args->nfs_server.export_path,
1289 args->mount_server.version,
1290 args->mount_server.protocol,
1291 root_fh);
efd8340b
CL		 1292 if (status == 0)
1293 return 0;
0076d7b7 1294
396cee97 1295 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
33832034 1296 hostname, status);
0076d7b7
CL		 1297 return status;
1298}
1299
d1aa0825
CL		 1300static int nfs_parse_simple_hostname(const char *dev_name,
1301 char **hostname, size_t maxnamlen,
1302 char **export_path, size_t maxpathlen)
dc045898
CL		 1303{
1304 size_t len;
1305 char *colon, *comma;
1306
1307 colon = strchr(dev_name, ':');
1308 if (colon == NULL)
1309 goto out_bad_devname;
1310
1311 len = colon - dev_name;
1312 if (len > maxnamlen)
1313 goto out_hostname;
1314
1315 /* N.B. caller will free nfs_server.hostname in all cases */
1316 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1317 if (!*hostname)
1318 goto out_nomem;
1319
1320 /* kill possible hostname list: not supported */
1321 comma = strchr(*hostname, ',');
1322 if (comma != NULL) {
1323 if (comma == *hostname)
1324 goto out_bad_devname;
1325 *comma = '\0';
1326 }
1327
1328 colon++;
1329 len = strlen(colon);
1330 if (len > maxpathlen)
1331 goto out_path;
1332 *export_path = kstrndup(colon, len, GFP_KERNEL);
1333 if (!*export_path)
1334 goto out_nomem;
1335
1336 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1337 return 0;
1338
1339out_bad_devname:
1340 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1341 return -EINVAL;
1342
1343out_nomem:
1344 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1345 return -ENOMEM;
1346
1347out_hostname:
1348 dfprintk(MOUNT, "NFS: server hostname too long\n");
1349 return -ENAMETOOLONG;
1350
1351out_path:
1352 dfprintk(MOUNT, "NFS: export pathname too long\n");
1353 return -ENAMETOOLONG;
1354}
1355
d1aa0825
CL		 1356/*
1357 * Hostname has square brackets around it because it contains one or
1358 * more colons. We look for the first closing square bracket, and a
1359 * colon must follow it.
1360 */
1361static int nfs_parse_protected_hostname(const char *dev_name,
1362 char **hostname, size_t maxnamlen,
1363 char **export_path, size_t maxpathlen)
1364{
1365 size_t len;
1366 char *start, *end;
1367
1368 start = (char *)(dev_name + 1);
1369
1370 end = strchr(start, ']');
1371 if (end == NULL)
1372 goto out_bad_devname;
1373 if (*(end + 1) != ':')
1374 goto out_bad_devname;
1375
1376 len = end - start;
1377 if (len > maxnamlen)
1378 goto out_hostname;
1379
1380 /* N.B. caller will free nfs_server.hostname in all cases */
1381 *hostname = kstrndup(start, len, GFP_KERNEL);
1382 if (*hostname == NULL)
1383 goto out_nomem;
1384
1385 end += 2;
1386 len = strlen(end);
1387 if (len > maxpathlen)
1388 goto out_path;
1389 *export_path = kstrndup(end, len, GFP_KERNEL);
1390 if (!*export_path)
1391 goto out_nomem;
1392
1393 return 0;
1394
1395out_bad_devname:
1396 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1397 return -EINVAL;
1398
1399out_nomem:
1400 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1401 return -ENOMEM;
1402
1403out_hostname:
1404 dfprintk(MOUNT, "NFS: server hostname too long\n");
1405 return -ENAMETOOLONG;
1406
1407out_path:
1408 dfprintk(MOUNT, "NFS: export pathname too long\n");
1409 return -ENAMETOOLONG;
1410}
1411
1412/*
1413 * Split "dev_name" into "hostname:export_path".
1414 *
1415 * The leftmost colon demarks the split between the server's hostname
1416 * and the export path. If the hostname starts with a left square
1417 * bracket, then it may contain colons.
1418 *
1419 * Note: caller frees hostname and export path, even on error.
1420 */
1421static int nfs_parse_devname(const char *dev_name,
1422 char **hostname, size_t maxnamlen,
1423 char **export_path, size_t maxpathlen)
1424{
1425 if (*dev_name == '[')
1426 return nfs_parse_protected_hostname(dev_name,
1427 hostname, maxnamlen,
1428 export_path, maxpathlen);
1429
1430 return nfs_parse_simple_hostname(dev_name,
1431 hostname, maxnamlen,
1432 export_path, maxpathlen);
1433}
1434
f7b422b1 1435/*
54ceac45
DH		 1436 * Validate the NFS2/NFS3 mount data
1437 * - fills in the mount root filehandle
136d558c
CL		 1438 *
1439 * For option strings, user space handles the following behaviors:
1440 *
1441 * + DNS: mapping server host name to IP address ("addr=" option)
1442 *
1443 * + failure mode: how to behave if a mount request can't be handled
1444 * immediately ("fg/bg" option)
1445 *
1446 * + retry: how often to retry a mount request ("retry=" option)
1447 *
1448 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1449 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1450 */
2283f8d6
TT		 1451static int nfs_validate_mount_data(void *options,
1452 struct nfs_parsed_mount_data *args,
136d558c
CL		 1453 struct nfs_fh *mntfh,
1454 const char *dev_name)
f7b422b1 1455{
2283f8d6 1456 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
136d558c 1457
5df36e78
CL		 1458 if (data == NULL)
1459 goto out_no_data;
f7b422b1 1460
2283f8d6
TT		 1461 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1462 args->rsize = NFS_MAX_FILE_IO_SIZE;
1463 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 1464 args->acregmin = NFS_DEF_ACREGMIN;
1465 args->acregmax = NFS_DEF_ACREGMAX;
1466 args->acdirmin = NFS_DEF_ACDIRMIN;
1467 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 1468 args->mount_server.port = 0; /* autobind unless user sets port */
f22d6d79 1469 args->nfs_server.port = 0; /* autobind unless user sets port */
0896a725 1470 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
dd07c947 1471 args->auth_flavors[0] = RPC_AUTH_UNIX;
2283f8d6 1472
54ceac45 1473 switch (data->version) {
5df36e78
CL		 1474 case 1:
1475 data->namlen = 0;
1476 case 2:
1477 data->bsize = 0;
1478 case 3:
1479 if (data->flags & NFS_MOUNT_VER3)
1480 goto out_no_v3;
1481 data->root.size = NFS2_FHSIZE;
1482 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1483 case 4:
1484 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1485 goto out_no_sec;
1486 case 5:
1487 memset(data->context, 0, sizeof(data->context));
1488 case 6:
b7e24457
TM		 1489 if (data->flags & NFS_MOUNT_VER3) {
1490 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1491 goto out_invalid_fh;
5df36e78 1492 mntfh->size = data->root.size;
b7e24457 1493 } else
5df36e78
CL		 1494 mntfh->size = NFS2_FHSIZE;
1495
5df36e78
CL		 1496
1497 memcpy(mntfh->data, data->root.data, mntfh->size);
1498 if (mntfh->size < sizeof(mntfh->data))
1499 memset(mntfh->data + mntfh->size, 0,
1500 sizeof(mntfh->data) - mntfh->size);
6e88e061 1501
2283f8d6
TT		 1502 /*
1503 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1504 * can deal with.
1505 */
1506 args->flags = data->flags;
1507 args->rsize = data->rsize;
1508 args->wsize = data->wsize;
2283f8d6
TT		 1509 args->timeo = data->timeo;
1510 args->retrans = data->retrans;
1511 args->acregmin = data->acregmin;
1512 args->acregmax = data->acregmax;
1513 args->acdirmin = data->acdirmin;
1514 args->acdirmax = data->acdirmax;
4c568017
CL		 1515
1516 memcpy(&args->nfs_server.address, &data->addr,
1517 sizeof(data->addr));
1518 args->nfs_server.addrlen = sizeof(data->addr);
1519 if (!nfs_verify_server_address((struct sockaddr *)
1520 &args->nfs_server.address))
1521 goto out_no_address;
1522
2283f8d6 1523 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1524 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1525 /* N.B. caller will free nfs_server.hostname in all cases */
1526 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1527 args->namlen = data->namlen;
1528 args->bsize = data->bsize;
dd07c947
CL		 1529
1530 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1531 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1532 if (!args->nfs_server.hostname)
1533 goto out_nomem;
f9c3a380
EP		 1534
1535 /*
1536 * The legacy version 6 binary mount data from userspace has a
1537 * field used only to transport selinux information into the
1538 * the kernel. To continue to support that functionality we
1539 * have a touch of selinux knowledge here in the NFS code. The
1540 * userspace code converted context=blah to just blah so we are
1541 * converting back to the full string selinux understands.
1542 */
1543 if (data->context[0]){
1544#ifdef CONFIG_SECURITY_SELINUX
1545 int rc;
1546 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1547 if (!opts_str)
1548 return -ENOMEM;
1549 strcpy(opts_str, "context=");
1550 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1551 strcat(opts_str, &data->context[0]);
1552 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1553 kfree(opts_str);
1554 if (rc)
1555 return rc;
1556#else
1557 return -EINVAL;
1558#endif
1559 }
1560
5df36e78 1561 break;
136d558c 1562 default: {
136d558c 1563 int status;
136d558c 1564
2283f8d6
TT		 1565 if (nfs_parse_mount_options((char *)options, args) == 0)
1566 return -EINVAL;
136d558c 1567
6e88e061
CL		 1568 if (!nfs_verify_server_address((struct sockaddr *)
1569 &args->nfs_server.address))
1570 goto out_no_address;
1571
ed596a8a
CL		 1572 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1573 args->nfs_server.port);
1574
259875ef
TM		 1575 nfs_set_mount_transport_protocol(args);
1576
dc045898
CL		 1577 status = nfs_parse_devname(dev_name,
1578 &args->nfs_server.hostname,
1579 PAGE_SIZE,
1580 &args->nfs_server.export_path,
1581 NFS_MAXPATHLEN);
1582 if (!status)
1583 status = nfs_try_mount(args, mntfh);
136d558c 1584
dc045898
CL		 1585 kfree(args->nfs_server.export_path);
1586 args->nfs_server.export_path = NULL;
136d558c 1587
136d558c 1588 if (status)
fdc6e2c8 1589 return status;
136d558c 1590
136d558c
CL		 1591 break;
1592 }
f7b422b1 1593 }
54ceac45
DH		 1594
1595#ifndef CONFIG_NFS_V3
2283f8d6 1596 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1597 goto out_v3_not_compiled;
1598#endif /* !CONFIG_NFS_V3 */
f7b422b1 1599
5df36e78 1600 return 0;
f7b422b1 1601
5df36e78
CL		 1602out_no_data:
1603 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1604 return -EINVAL;
54ceac45 1605
5df36e78
CL		 1606out_no_v3:
1607 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1608 data->version);
1609 return -EINVAL;
f7b422b1 1610
5df36e78
CL		 1611out_no_sec:
1612 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1613 return -EINVAL;
1614
5df36e78
CL		 1615#ifndef CONFIG_NFS_V3
1616out_v3_not_compiled:
1617 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1618 return -EPROTONOSUPPORT;
1619#endif /* !CONFIG_NFS_V3 */
1620
63649bd7
CG		 1621out_nomem:
1622 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1623 return -ENOMEM;
1624
5df36e78
CL		 1625out_no_address:
1626 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1627 return -EINVAL;
1628
1629out_invalid_fh:
1630 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1631 return -EINVAL;
f7b422b1
DH		 1632}
1633
48b605f8
JL		 1634static int
1635nfs_compare_remount_data(struct nfs_server *nfss,
1636 struct nfs_parsed_mount_data *data)
1637{
1638 if (data->flags != nfss->flags ||
1639 data->rsize != nfss->rsize ||
1640 data->wsize != nfss->wsize ||
1641 data->retrans != nfss->client->cl_timeout->to_retries ||
1642 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1643 data->acregmin != nfss->acregmin / HZ ||
1644 data->acregmax != nfss->acregmax / HZ ||
1645 data->acdirmin != nfss->acdirmin / HZ ||
1646 data->acdirmax != nfss->acdirmax / HZ ||
1647 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1648 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1649 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1650 data->nfs_server.addrlen) != 0)
1651 return -EINVAL;
1652
1653 return 0;
1654}
1655
1656static int
1657nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1658{
1659 int error;
1660 struct nfs_server *nfss = sb->s_fs_info;
1661 struct nfs_parsed_mount_data *data;
1662 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1663 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1664 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1665
1666 /*
1667 * Userspace mount programs that send binary options generally send
1668 * them populated with default values. We have no way to know which
1669 * ones were explicitly specified. Fall back to legacy behavior and
1670 * just return success.
1671 */
cd100725
TM		 1672 if ((nfsvers == 4 && options4->version == 1) ||
1673 (nfsvers <= 3 && options->version >= 1 &&
48b605f8
JL		 1674 options->version <= 6))
1675 return 0;
1676
1677 data = kzalloc(sizeof(*data), GFP_KERNEL);
1678 if (data == NULL)
1679 return -ENOMEM;
1680
1681 /* fill out struct with values from existing mount */
1682 data->flags = nfss->flags;
1683 data->rsize = nfss->rsize;
1684 data->wsize = nfss->wsize;
1685 data->retrans = nfss->client->cl_timeout->to_retries;
1686 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1687 data->acregmin = nfss->acregmin / HZ;
1688 data->acregmax = nfss->acregmax / HZ;
1689 data->acdirmin = nfss->acdirmin / HZ;
1690 data->acdirmax = nfss->acdirmax / HZ;
1691 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1692 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1693 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1694 data->nfs_server.addrlen);
1695
1696 /* overwrite those values with any that were specified */
1697 error = nfs_parse_mount_options((char *)options, data);
1698 if (error < 0)
1699 goto out;
1700
1701 /* compare new mount options with old ones */
1702 error = nfs_compare_remount_data(nfss, data);
1703out:
1704 kfree(data);
1705 return error;
1706}
1707
f7b422b1 1708/*
54ceac45 1709 * Initialise the common bits of the superblock
f7b422b1 1710 */
54ceac45 1711static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1712{
54ceac45 1713 struct nfs_server *server = NFS_SB(sb);
5006a76c 1714
54ceac45 1715 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1716
54ceac45
DH		 1717 /* We probably want something more informative here */
1718 snprintf(sb->s_id, sizeof(sb->s_id),
1719 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1720
54ceac45
DH		 1721 if (sb->s_blocksize == 0)
1722 sb->s_blocksize = nfs_block_bits(server->wsize,
1723 &sb->s_blocksize_bits);
f7b422b1 1724
54ceac45
DH		 1725 if (server->flags & NFS_MOUNT_NOAC)
1726 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1727
54ceac45 1728 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1729}
1730
1731/*
54ceac45 1732 * Finish setting up an NFS2/3 superblock
f7b422b1 1733 */
2283f8d6
TT		 1734static void nfs_fill_super(struct super_block *sb,
1735 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1736{
1737 struct nfs_server *server = NFS_SB(sb);
5006a76c 1738
54ceac45
DH		 1739 sb->s_blocksize_bits = 0;
1740 sb->s_blocksize = 0;
1741 if (data->bsize)
1742 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1743
54ceac45
DH		 1744 if (server->flags & NFS_MOUNT_VER3) {
1745 /* The VFS shouldn't apply the umask to mode bits. We will do
1746 * so ourselves when necessary.
1747 */
1748 sb->s_flags |= MS_POSIXACL;
1749 sb->s_time_gran = 1;
816724e6 1750 }
54ceac45
DH		 1751
1752 sb->s_op = &nfs_sops;
1753 nfs_initialise_sb(sb);
f7b422b1
DH		 1754}
1755
1756/*
54ceac45 1757 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1758 */
54ceac45
DH		 1759static void nfs_clone_super(struct super_block *sb,
1760 const struct super_block *old_sb)
f7b422b1 1761{
54ceac45
DH		 1762 struct nfs_server *server = NFS_SB(sb);
1763
1764 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1765 sb->s_blocksize = old_sb->s_blocksize;
1766 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1767
f7b422b1 1768 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1769 /* The VFS shouldn't apply the umask to mode bits. We will do
1770 * so ourselves when necessary.
f7b422b1
DH		 1771 */
1772 sb->s_flags |= MS_POSIXACL;
f7b422b1 1773 sb->s_time_gran = 1;
f7b422b1
DH		 1774 }
1775
54ceac45
DH		 1776 sb->s_op = old_sb->s_op;
1777 nfs_initialise_sb(sb);
f7b422b1
DH		 1778}
1779
275a5d24
TM		 1780#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1781
1782static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1783{
1784 const struct nfs_server *a = s->s_fs_info;
1785 const struct rpc_clnt *clnt_a = a->client;
1786 const struct rpc_clnt *clnt_b = b->client;
1787
1788 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1789 goto Ebusy;
1790 if (a->nfs_client != b->nfs_client)
1791 goto Ebusy;
1792 if (a->flags != b->flags)
1793 goto Ebusy;
1794 if (a->wsize != b->wsize)
1795 goto Ebusy;
1796 if (a->rsize != b->rsize)
1797 goto Ebusy;
1798 if (a->acregmin != b->acregmin)
1799 goto Ebusy;
1800 if (a->acregmax != b->acregmax)
1801 goto Ebusy;
1802 if (a->acdirmin != b->acdirmin)
1803 goto Ebusy;
1804 if (a->acdirmax != b->acdirmax)
1805 goto Ebusy;
1806 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1807 goto Ebusy;
e89a5a43 1808 return 1;
275a5d24 1809Ebusy:
e89a5a43
TM		 1810 return 0;
1811}
1812
1813struct nfs_sb_mountdata {
1814 struct nfs_server *server;
1815 int mntflags;
1816};
1817
1818static int nfs_set_super(struct super_block *s, void *data)
1819{
1820 struct nfs_sb_mountdata *sb_mntdata = data;
1821 struct nfs_server *server = sb_mntdata->server;
1822 int ret;
1823
1824 s->s_flags = sb_mntdata->mntflags;
1825 s->s_fs_info = server;
1826 ret = set_anon_super(s, server);
1827 if (ret == 0)
1828 server->s_dev = s->s_dev;
1829 return ret;
1830}
1831
fd00a8ff
CL		 1832static int nfs_compare_super_address(struct nfs_server *server1,
1833 struct nfs_server *server2)
1834{
1835 struct sockaddr *sap1, *sap2;
1836
1837 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1838 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1839
1840 if (sap1->sa_family != sap2->sa_family)
1841 return 0;
1842
1843 switch (sap1->sa_family) {
1844 case AF_INET: {
1845 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1846 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1847 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1848 return 0;
1849 if (sin1->sin_port != sin2->sin_port)
1850 return 0;
1851 break;
1852 }
1853 case AF_INET6: {
1854 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1855 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1856 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1857 return 0;
1858 if (sin1->sin6_port != sin2->sin6_port)
1859 return 0;
1860 break;
1861 }
1862 default:
1863 return 0;
1864 }
1865
1866 return 1;
1867}
1868
e89a5a43
TM		 1869static int nfs_compare_super(struct super_block *sb, void *data)
1870{
1871 struct nfs_sb_mountdata *sb_mntdata = data;
1872 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1873 int mntflags = sb_mntdata->mntflags;
1874
fd00a8ff 1875 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 1876 return 0;
1877 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1878 if (old->flags & NFS_MOUNT_UNSHARED)
1879 return 0;
1880 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1881 return 0;
1882 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 1883}
1884
fa799759
MS		 1885static int nfs_bdi_register(struct nfs_server *server)
1886{
1887 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1888}
1889
816724e6
TM		 1890static int nfs_get_sb(struct file_system_type *fs_type,
1891 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 1892{
f7b422b1
DH		 1893 struct nfs_server *server = NULL;
1894 struct super_block *s;
33852a1f
TM		 1895 struct nfs_parsed_mount_data *data;
1896 struct nfs_fh *mntfh;
54ceac45 1897 struct dentry *mntroot;
75180df2 1898 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1899 struct nfs_sb_mountdata sb_mntdata = {
1900 .mntflags = flags,
1901 };
33852a1f
TM		 1902 int error = -ENOMEM;
1903
1904 data = kzalloc(sizeof(*data), GFP_KERNEL);
1905 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1906 if (data == NULL || mntfh == NULL)
1907 goto out_free_fh;
f7b422b1 1908
33852a1f 1909 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 1910
54ceac45 1911 /* Validate the mount data */
33852a1f 1912 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
54ceac45 1913 if (error < 0)
0655960f 1914 goto out;
f7b422b1 1915
54ceac45 1916 /* Get a volume representation */
33852a1f 1917 server = nfs_create_server(data, mntfh);
54ceac45
DH		 1918 if (IS_ERR(server)) {
1919 error = PTR_ERR(server);
0655960f 1920 goto out;
f7b422b1 1921 }
e89a5a43 1922 sb_mntdata.server = server;
f7b422b1 1923
75180df2
TM		 1924 if (server->flags & NFS_MOUNT_UNSHARED)
1925 compare_super = NULL;
1926
54ceac45 1927 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 1928 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 1929 if (IS_ERR(s)) {
1930 error = PTR_ERR(s);
54ceac45 1931 goto out_err_nosb;
816724e6
TM		 1932 }
1933
54ceac45
DH		 1934 if (s->s_fs_info != server) {
1935 nfs_free_server(server);
1936 server = NULL;
fa799759
MS		 1937 } else {
1938 error = nfs_bdi_register(server);
1939 if (error)
1940 goto error_splat_super;
54ceac45 1941 }
f7b422b1 1942
54ceac45
DH		 1943 if (!s->s_root) {
1944 /* initial superblock/root creation */
33852a1f 1945 nfs_fill_super(s, data);
54ceac45 1946 }
f7b422b1 1947
33852a1f 1948 mntroot = nfs_get_root(s, mntfh);
54ceac45
DH		 1949 if (IS_ERR(mntroot)) {
1950 error = PTR_ERR(mntroot);
1951 goto error_splat_super;
f7b422b1 1952 }
816724e6 1953
33852a1f 1954 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 1955 if (error)
1956 goto error_splat_root;
1957
54ceac45
DH		 1958 s->s_flags |= MS_ACTIVE;
1959 mnt->mnt_sb = s;
1960 mnt->mnt_root = mntroot;
0655960f
CL		 1961 error = 0;
1962
1963out:
33852a1f
TM		 1964 kfree(data->nfs_server.hostname);
1965 kfree(data->mount_server.hostname);
1966 security_free_mnt_opts(&data->lsm_opts);
1967out_free_fh:
1968 kfree(mntfh);
1969 kfree(data);
0655960f 1970 return error;
816724e6 1971
54ceac45
DH		 1972out_err_nosb:
1973 nfs_free_server(server);
0655960f 1974 goto out;
54ceac45 1975
f9c3a380
EP		 1976error_splat_root:
1977 dput(mntroot);
54ceac45
DH		 1978error_splat_super:
1979 up_write(&s->s_umount);
1980 deactivate_super(s);
0655960f 1981 goto out;
f7b422b1
DH		 1982}
1983
54ceac45
DH		 1984/*
1985 * Destroy an NFS2/3 superblock
1986 */
f7b422b1
DH		 1987static void nfs_kill_super(struct super_block *s)
1988{
1989 struct nfs_server *server = NFS_SB(s);
1990
fa799759 1991 bdi_unregister(&server->backing_dev_info);
f7b422b1 1992 kill_anon_super(s);
54ceac45 1993 nfs_free_server(server);
f7b422b1
DH		 1994}
1995
54ceac45
DH		 1996/*
1997 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1998 */
1999static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2000 const char *dev_name, void *raw_data,
2001 struct vfsmount *mnt)
f7b422b1
DH		 2002{
2003 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2004 struct super_block *s;
2005 struct nfs_server *server;
2006 struct dentry *mntroot;
75180df2 2007 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2008 struct nfs_sb_mountdata sb_mntdata = {
2009 .mntflags = flags,
2010 };
54ceac45 2011 int error;
f7b422b1 2012
54ceac45 2013 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 2014
54ceac45
DH		 2015 /* create a new volume representation */
2016 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2017 if (IS_ERR(server)) {
2018 error = PTR_ERR(server);
2019 goto out_err_noserver;
2020 }
e89a5a43 2021 sb_mntdata.server = server;
8fa5c000 2022
75180df2
TM		 2023 if (server->flags & NFS_MOUNT_UNSHARED)
2024 compare_super = NULL;
2025
54ceac45 2026 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2027 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2028 if (IS_ERR(s)) {
2029 error = PTR_ERR(s);
2030 goto out_err_nosb;
2031 }
5006a76c 2032
54ceac45
DH		 2033 if (s->s_fs_info != server) {
2034 nfs_free_server(server);
2035 server = NULL;
fa799759
MS		 2036 } else {
2037 error = nfs_bdi_register(server);
2038 if (error)
2039 goto error_splat_super;
f7b422b1 2040 }
24c8dbbb 2041
54ceac45
DH		 2042 if (!s->s_root) {
2043 /* initial superblock/root creation */
54ceac45
DH		 2044 nfs_clone_super(s, data->sb);
2045 }
f7b422b1 2046
54ceac45
DH		 2047 mntroot = nfs_get_root(s, data->fh);
2048 if (IS_ERR(mntroot)) {
2049 error = PTR_ERR(mntroot);
2050 goto error_splat_super;
f7b422b1 2051 }
e9cc6c23 2052 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2053 dput(mntroot);
2054 error = -ESTALE;
2055 goto error_splat_super;
2056 }
f7b422b1 2057
54ceac45
DH		 2058 s->s_flags |= MS_ACTIVE;
2059 mnt->mnt_sb = s;
2060 mnt->mnt_root = mntroot;
f7b422b1 2061
f9c3a380
EP		 2062 /* clone any lsm security options from the parent to the new sb */
2063 security_sb_clone_mnt_opts(data->sb, s);
2064
54ceac45
DH		 2065 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2066 return 0;
24c8dbbb 2067
54ceac45
DH		 2068out_err_nosb:
2069 nfs_free_server(server);
2070out_err_noserver:
2071 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2072 return error;
f7b422b1 2073
54ceac45
DH		 2074error_splat_super:
2075 up_write(&s->s_umount);
2076 deactivate_super(s);
2077 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2078 return error;
f7b422b1
DH		 2079}
2080
54ceac45
DH		 2081#ifdef CONFIG_NFS_V4
2082
f7b422b1 2083/*
54ceac45 2084 * Finish setting up a cloned NFS4 superblock
f7b422b1 2085 */
54ceac45
DH		 2086static void nfs4_clone_super(struct super_block *sb,
2087 const struct super_block *old_sb)
f7b422b1 2088{
54ceac45
DH		 2089 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2090 sb->s_blocksize = old_sb->s_blocksize;
2091 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2092 sb->s_time_gran = 1;
54ceac45
DH		 2093 sb->s_op = old_sb->s_op;
2094 nfs_initialise_sb(sb);
f7b422b1
DH		 2095}
2096
54ceac45
DH		 2097/*
2098 * Set up an NFS4 superblock
2099 */
2100static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2101{
54ceac45
DH		 2102 sb->s_time_gran = 1;
2103 sb->s_op = &nfs4_sops;
2104 nfs_initialise_sb(sb);
f7b422b1
DH		 2105}
2106
f0768ebd
CL		 2107/*
2108 * Validate NFSv4 mount options
2109 */
91ea40b9
TT		 2110static int nfs4_validate_mount_data(void *options,
2111 struct nfs_parsed_mount_data *args,
2112 const char *dev_name)
f0768ebd 2113{
4c568017 2114 struct sockaddr_in *ap;
91ea40b9 2115 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2116 char *c;
2117
2118 if (data == NULL)
2119 goto out_no_data;
2120
91ea40b9
TT		 2121 args->rsize = NFS_MAX_FILE_IO_SIZE;
2122 args->wsize = NFS_MAX_FILE_IO_SIZE;
0e0cab74
CL		 2123 args->acregmin = NFS_DEF_ACREGMIN;
2124 args->acregmax = NFS_DEF_ACREGMAX;
2125 args->acdirmin = NFS_DEF_ACDIRMIN;
2126 args->acdirmax = NFS_DEF_ACDIRMAX;
f22d6d79 2127 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
6738b251
CL		 2128 args->auth_flavors[0] = RPC_AUTH_UNIX;
2129 args->auth_flavor_len = 0;
91ea40b9 2130
f0768ebd
CL		 2131 switch (data->version) {
2132 case 1:
4c568017
CL		 2133 ap = (struct sockaddr_in *)&args->nfs_server.address;
2134 if (data->host_addrlen > sizeof(args->nfs_server.address))
2135 goto out_no_address;
2136 if (data->host_addrlen == 0)
f0768ebd 2137 goto out_no_address;
4c568017
CL		 2138 args->nfs_server.addrlen = data->host_addrlen;
2139 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
f0768ebd 2140 return -EFAULT;
91ea40b9
TT		 2141 if (!nfs_verify_server_address((struct sockaddr *)
2142 &args->nfs_server.address))
f0768ebd
CL		 2143 goto out_no_address;
2144
6738b251
CL		 2145 if (data->auth_flavourlen) {
2146 if (data->auth_flavourlen > 1)
2147 goto out_inval_auth;
20c71f5e 2148 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2149 data->auth_flavours,
20c71f5e 2150 sizeof(args->auth_flavors[0])))
f0768ebd 2151 return -EFAULT;
f0768ebd
CL		 2152 }
2153
2154 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2155 if (IS_ERR(c))
2156 return PTR_ERR(c);
91ea40b9 2157 args->nfs_server.hostname = c;
f0768ebd
CL		 2158
2159 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2160 if (IS_ERR(c))
2161 return PTR_ERR(c);
91ea40b9
TT		 2162 args->nfs_server.export_path = c;
2163 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2164
2165 c = strndup_user(data->client_addr.data, 16);
2166 if (IS_ERR(c))
2167 return PTR_ERR(c);
91ea40b9
TT		 2168 args->client_address = c;
2169
2170 /*
2171 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2172 * can deal with.
2173 */
2174
2175 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2176 args->rsize = data->rsize;
2177 args->wsize = data->wsize;
2178 args->timeo = data->timeo;
2179 args->retrans = data->retrans;
2180 args->acregmin = data->acregmin;
2181 args->acregmax = data->acregmax;
2182 args->acdirmin = data->acdirmin;
2183 args->acdirmax = data->acdirmax;
2184 args->nfs_server.protocol = data->proto;
259875ef 2185 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2186
2187 break;
80071225 2188 default: {
dc045898 2189 int status;
91ea40b9
TT		 2190
2191 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2192 return -EINVAL;
2193
2194 if (!nfs_verify_server_address((struct sockaddr *)
91ea40b9 2195 &args->nfs_server.address))
80071225 2196 return -EINVAL;
80071225 2197
ed596a8a
CL		 2198 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2199 args->nfs_server.port);
2200
259875ef
TM		 2201 nfs_validate_transport_protocol(args);
2202
6738b251 2203 if (args->auth_flavor_len > 1)
80071225 2204 goto out_inval_auth;
80071225 2205
91ea40b9 2206 if (args->client_address == NULL)
0a87cf12
JL		 2207 goto out_no_client_address;
2208
dc045898
CL		 2209 status = nfs_parse_devname(dev_name,
2210 &args->nfs_server.hostname,
2211 NFS4_MAXNAMLEN,
2212 &args->nfs_server.export_path,
2213 NFS4_MAXPATHLEN);
2214 if (status < 0)
2215 return status;
2216
80071225
CL		 2217 break;
2218 }
f0768ebd
CL		 2219 }
2220
2221 return 0;
2222
2223out_no_data:
2224 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2225 return -EINVAL;
2226
2227out_inval_auth:
2228 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2229 data->auth_flavourlen);
2230 return -EINVAL;
2231
2232out_no_address:
2233 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2234 return -EINVAL;
0a87cf12
JL		 2235
2236out_no_client_address:
2237 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2238 return -EINVAL;
f0768ebd
CL		 2239}
2240
54ceac45
DH		 2241/*
2242 * Get the superblock for an NFS4 mountpoint
2243 */
816724e6
TM		 2244static int nfs4_get_sb(struct file_system_type *fs_type,
2245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 2246{
33852a1f 2247 struct nfs_parsed_mount_data *data;
54ceac45
DH		 2248 struct super_block *s;
2249 struct nfs_server *server;
33852a1f 2250 struct nfs_fh *mntfh;
54ceac45 2251 struct dentry *mntroot;
75180df2 2252 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2253 struct nfs_sb_mountdata sb_mntdata = {
2254 .mntflags = flags,
2255 };
33852a1f
TM		 2256 int error = -ENOMEM;
2257
2258 data = kzalloc(sizeof(*data), GFP_KERNEL);
2259 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2260 if (data == NULL || mntfh == NULL)
2261 goto out_free_fh;
f7b422b1 2262
33852a1f 2263 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2264
f0768ebd 2265 /* Validate the mount data */
33852a1f 2266 error = nfs4_validate_mount_data(raw_data, data, dev_name);
f0768ebd
CL		 2267 if (error < 0)
2268 goto out;
f7b422b1 2269
54ceac45 2270 /* Get a volume representation */
33852a1f 2271 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2272 if (IS_ERR(server)) {
2273 error = PTR_ERR(server);
29eb981a 2274 goto out;
f7b422b1 2275 }
e89a5a43 2276 sb_mntdata.server = server;
f7b422b1 2277
75180df2
TM		 2278 if (server->flags & NFS4_MOUNT_UNSHARED)
2279 compare_super = NULL;
2280
54ceac45 2281 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2282 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2283 if (IS_ERR(s)) {
2284 error = PTR_ERR(s);
f7b422b1 2285 goto out_free;
816724e6
TM		 2286 }
2287
5dd3177a
TM		 2288 if (s->s_fs_info != server) {
2289 nfs_free_server(server);
2290 server = NULL;
fa799759
MS		 2291 } else {
2292 error = nfs_bdi_register(server);
2293 if (error)
2294 goto error_splat_super;
5dd3177a
TM		 2295 }
2296
54ceac45
DH		 2297 if (!s->s_root) {
2298 /* initial superblock/root creation */
54ceac45 2299 nfs4_fill_super(s);
54ceac45 2300 }
f7b422b1 2301
33852a1f 2302 mntroot = nfs4_get_root(s, mntfh);
54ceac45
DH		 2303 if (IS_ERR(mntroot)) {
2304 error = PTR_ERR(mntroot);
2305 goto error_splat_super;
f7b422b1 2306 }
54ceac45 2307
33852a1f 2308 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2309 if (error)
2310 goto error_splat_root;
2311
f7b422b1 2312 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 2313 mnt->mnt_sb = s;
2314 mnt->mnt_root = mntroot;
29eb981a
CL		 2315 error = 0;
2316
2317out:
33852a1f
TM		 2318 kfree(data->client_address);
2319 kfree(data->nfs_server.export_path);
2320 kfree(data->nfs_server.hostname);
2321 security_free_mnt_opts(&data->lsm_opts);
2322out_free_fh:
2323 kfree(mntfh);
2324 kfree(data);
29eb981a 2325 return error;
54ceac45 2326
f7b422b1 2327out_free:
54ceac45 2328 nfs_free_server(server);
29eb981a 2329 goto out;
54ceac45 2330
46c8ac74
EP		 2331error_splat_root:
2332 dput(mntroot);
54ceac45
DH		 2333error_splat_super:
2334 up_write(&s->s_umount);
2335 deactivate_super(s);
29eb981a 2336 goto out;
f7b422b1
DH		 2337}
2338
2339static void nfs4_kill_super(struct super_block *sb)
2340{
2341 struct nfs_server *server = NFS_SB(sb);
2342
2343 nfs_return_all_delegations(sb);
2344 kill_anon_super(sb);
2345
2346 nfs4_renewd_prepare_shutdown(server);
54ceac45 2347 nfs_free_server(server);
f7b422b1
DH		 2348}
2349
2350/*
54ceac45 2351 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2352 */
54ceac45
DH		 2353static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2354 const char *dev_name, void *raw_data,
2355 struct vfsmount *mnt)
f7b422b1 2356{
54ceac45
DH		 2357 struct nfs_clone_mount *data = raw_data;
2358 struct super_block *s;
2359 struct nfs_server *server;
2360 struct dentry *mntroot;
75180df2 2361 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2362 struct nfs_sb_mountdata sb_mntdata = {
2363 .mntflags = flags,
2364 };
54ceac45 2365 int error;
f7b422b1 2366
54ceac45 2367 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 2368
54ceac45
DH		 2369 /* create a new volume representation */
2370 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2371 if (IS_ERR(server)) {
2372 error = PTR_ERR(server);
2373 goto out_err_noserver;
f7b422b1 2374 }
e89a5a43 2375 sb_mntdata.server = server;
f7b422b1 2376
75180df2
TM		 2377 if (server->flags & NFS4_MOUNT_UNSHARED)
2378 compare_super = NULL;
2379
54ceac45 2380 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2381 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2382 if (IS_ERR(s)) {
2383 error = PTR_ERR(s);
2384 goto out_err_nosb;
f7b422b1 2385 }
f7b422b1 2386
54ceac45
DH		 2387 if (s->s_fs_info != server) {
2388 nfs_free_server(server);
2389 server = NULL;
fa799759
MS		 2390 } else {
2391 error = nfs_bdi_register(server);
2392 if (error)
2393 goto error_splat_super;
54ceac45 2394 }
f7b422b1 2395
54ceac45
DH		 2396 if (!s->s_root) {
2397 /* initial superblock/root creation */
54ceac45
DH		 2398 nfs4_clone_super(s, data->sb);
2399 }
f7b422b1 2400
54ceac45
DH		 2401 mntroot = nfs4_get_root(s, data->fh);
2402 if (IS_ERR(mntroot)) {
2403 error = PTR_ERR(mntroot);
2404 goto error_splat_super;
2405 }
e9cc6c23
TM		 2406 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2407 dput(mntroot);
2408 error = -ESTALE;
2409 goto error_splat_super;
2410 }
f7b422b1 2411
54ceac45
DH		 2412 s->s_flags |= MS_ACTIVE;
2413 mnt->mnt_sb = s;
2414 mnt->mnt_root = mntroot;
2415
46c8ac74
EP		 2416 security_sb_clone_mnt_opts(data->sb, s);
2417
54ceac45
DH		 2418 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2419 return 0;
2420
2421out_err_nosb:
2422 nfs_free_server(server);
2423out_err_noserver:
2424 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2425 return error;
2426
2427error_splat_super:
2428 up_write(&s->s_umount);
2429 deactivate_super(s);
2430 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2431 return error;
f7b422b1
DH		 2432}
2433
54ceac45
DH		 2434/*
2435 * Create an NFS4 server record on referral traversal
2436 */
2437static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2438 const char *dev_name, void *raw_data,
2439 struct vfsmount *mnt)
f7b422b1
DH		 2440{
2441 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2442 struct super_block *s;
2443 struct nfs_server *server;
2444 struct dentry *mntroot;
2445 struct nfs_fh mntfh;
75180df2 2446 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2447 struct nfs_sb_mountdata sb_mntdata = {
2448 .mntflags = flags,
2449 };
54ceac45
DH		 2450 int error;
2451
2452 dprintk("--> nfs4_referral_get_sb()\n");
2453
2454 /* create a new volume representation */
2455 server = nfs4_create_referral_server(data, &mntfh);
2456 if (IS_ERR(server)) {
2457 error = PTR_ERR(server);
2458 goto out_err_noserver;
2459 }
e89a5a43 2460 sb_mntdata.server = server;
54ceac45 2461
75180df2
TM		 2462 if (server->flags & NFS4_MOUNT_UNSHARED)
2463 compare_super = NULL;
2464
54ceac45 2465 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2466 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2467 if (IS_ERR(s)) {
2468 error = PTR_ERR(s);
2469 goto out_err_nosb;
2470 }
2471
2472 if (s->s_fs_info != server) {
2473 nfs_free_server(server);
2474 server = NULL;
fa799759
MS		 2475 } else {
2476 error = nfs_bdi_register(server);
2477 if (error)
2478 goto error_splat_super;
54ceac45
DH		 2479 }
2480
2481 if (!s->s_root) {
2482 /* initial superblock/root creation */
54ceac45
DH		 2483 nfs4_fill_super(s);
2484 }
2485
f2d0d85e 2486 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 2487 if (IS_ERR(mntroot)) {
2488 error = PTR_ERR(mntroot);
2489 goto error_splat_super;
2490 }
e9cc6c23
TM		 2491 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2492 dput(mntroot);
2493 error = -ESTALE;
2494 goto error_splat_super;
2495 }
54ceac45
DH		 2496
2497 s->s_flags |= MS_ACTIVE;
2498 mnt->mnt_sb = s;
2499 mnt->mnt_root = mntroot;
2500
46c8ac74
EP		 2501 security_sb_clone_mnt_opts(data->sb, s);
2502
54ceac45
DH		 2503 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2504 return 0;
2505
2506out_err_nosb:
2507 nfs_free_server(server);
2508out_err_noserver:
2509 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2510 return error;
2511
2512error_splat_super:
2513 up_write(&s->s_umount);
2514 deactivate_super(s);
2515 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2516 return error;
f7b422b1
DH		 2517}
2518
54ceac45 2519#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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