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mm: clean up and kernelify shrinker registration
[net-next-2.6.git] / fs / nfs / super.c
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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>
36#include <linux/nfs_fs.h>
37#include <linux/nfs_mount.h>
38#include <linux/nfs4_mount.h>
39#include <linux/lockd/bind.h>
40#include <linux/smp_lock.h>
41#include <linux/seq_file.h>
42#include <linux/mount.h>
43#include <linux/nfs_idmap.h>
44#include <linux/vfs.h>
45#include <linux/inet.h>
46#include <linux/nfs_xdr.h>
b5d5dfbd 47#include <linux/magic.h>
bf0fd768 48#include <linux/parser.h>
f7b422b1
DH		 49
50#include <asm/system.h>
51#include <asm/uaccess.h>
52
53#include "nfs4_fs.h"
54#include "callback.h"
55#include "delegation.h"
56#include "iostat.h"
57#include "internal.h"
58
59#define NFSDBG_FACILITY NFSDBG_VFS
60
bf0fd768
CL		 61
62struct nfs_parsed_mount_data {
63 int flags;
64 int rsize, wsize;
65 int timeo, retrans;
66 int acregmin, acregmax,
67 acdirmin, acdirmax;
68 int namlen;
69 unsigned int bsize;
70 unsigned int auth_flavor_len;
71 rpc_authflavor_t auth_flavors[1];
72 char *client_address;
73
74 struct {
75 struct sockaddr_in address;
76 unsigned int program;
77 unsigned int version;
78 unsigned short port;
79 int protocol;
80 } mount_server;
81
82 struct {
83 struct sockaddr_in address;
84 char *hostname;
85 char *export_path;
86 unsigned int program;
87 int protocol;
88 } nfs_server;
89};
90
91enum {
92 /* Mount options that take no arguments */
93 Opt_soft, Opt_hard,
94 Opt_intr, Opt_nointr,
95 Opt_posix, Opt_noposix,
96 Opt_cto, Opt_nocto,
97 Opt_ac, Opt_noac,
98 Opt_lock, Opt_nolock,
99 Opt_v2, Opt_v3,
100 Opt_udp, Opt_tcp,
101 Opt_acl, Opt_noacl,
102 Opt_rdirplus, Opt_nordirplus,
75180df2 103 Opt_sharecache, Opt_nosharecache,
bf0fd768
CL		 104
105 /* Mount options that take integer arguments */
106 Opt_port,
107 Opt_rsize, Opt_wsize, Opt_bsize,
108 Opt_timeo, Opt_retrans,
109 Opt_acregmin, Opt_acregmax,
110 Opt_acdirmin, Opt_acdirmax,
111 Opt_actimeo,
112 Opt_namelen,
113 Opt_mountport,
114 Opt_mountprog, Opt_mountvers,
115 Opt_nfsprog, Opt_nfsvers,
116
117 /* Mount options that take string arguments */
118 Opt_sec, Opt_proto, Opt_mountproto,
119 Opt_addr, Opt_mounthost, Opt_clientaddr,
120
121 /* Mount options that are ignored */
122 Opt_userspace, Opt_deprecated,
123
124 Opt_err
125};
126
127static match_table_t nfs_mount_option_tokens = {
128 { Opt_userspace, "bg" },
129 { Opt_userspace, "fg" },
130 { Opt_soft, "soft" },
131 { Opt_hard, "hard" },
132 { Opt_intr, "intr" },
133 { Opt_nointr, "nointr" },
134 { Opt_posix, "posix" },
135 { Opt_noposix, "noposix" },
136 { Opt_cto, "cto" },
137 { Opt_nocto, "nocto" },
138 { Opt_ac, "ac" },
139 { Opt_noac, "noac" },
140 { Opt_lock, "lock" },
141 { Opt_nolock, "nolock" },
142 { Opt_v2, "v2" },
143 { Opt_v3, "v3" },
144 { Opt_udp, "udp" },
145 { Opt_tcp, "tcp" },
146 { Opt_acl, "acl" },
147 { Opt_noacl, "noacl" },
148 { Opt_rdirplus, "rdirplus" },
149 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 150 { Opt_sharecache, "sharecache" },
151 { Opt_nosharecache, "nosharecache" },
bf0fd768
CL		 152
153 { Opt_port, "port=%u" },
154 { Opt_rsize, "rsize=%u" },
155 { Opt_wsize, "wsize=%u" },
156 { Opt_bsize, "bsize=%u" },
157 { Opt_timeo, "timeo=%u" },
158 { Opt_retrans, "retrans=%u" },
159 { Opt_acregmin, "acregmin=%u" },
160 { Opt_acregmax, "acregmax=%u" },
161 { Opt_acdirmin, "acdirmin=%u" },
162 { Opt_acdirmax, "acdirmax=%u" },
163 { Opt_actimeo, "actimeo=%u" },
164 { Opt_userspace, "retry=%u" },
165 { Opt_namelen, "namlen=%u" },
166 { Opt_mountport, "mountport=%u" },
167 { Opt_mountprog, "mountprog=%u" },
168 { Opt_mountvers, "mountvers=%u" },
169 { Opt_nfsprog, "nfsprog=%u" },
170 { Opt_nfsvers, "nfsvers=%u" },
171 { Opt_nfsvers, "vers=%u" },
172
173 { Opt_sec, "sec=%s" },
174 { Opt_proto, "proto=%s" },
175 { Opt_mountproto, "mountproto=%s" },
176 { Opt_addr, "addr=%s" },
177 { Opt_clientaddr, "clientaddr=%s" },
178 { Opt_mounthost, "mounthost=%s" },
179
180 { Opt_err, NULL }
181};
182
183enum {
184 Opt_xprt_udp, Opt_xprt_tcp,
185
186 Opt_xprt_err
187};
188
189static match_table_t nfs_xprt_protocol_tokens = {
190 { Opt_xprt_udp, "udp" },
191 { Opt_xprt_tcp, "tcp" },
192
193 { Opt_xprt_err, NULL }
194};
195
196enum {
197 Opt_sec_none, Opt_sec_sys,
198 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
199 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
200 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
201
202 Opt_sec_err
203};
204
205static match_table_t nfs_secflavor_tokens = {
206 { Opt_sec_none, "none" },
207 { Opt_sec_none, "null" },
208 { Opt_sec_sys, "sys" },
209
210 { Opt_sec_krb5, "krb5" },
211 { Opt_sec_krb5i, "krb5i" },
212 { Opt_sec_krb5p, "krb5p" },
213
214 { Opt_sec_lkey, "lkey" },
215 { Opt_sec_lkeyi, "lkeyi" },
216 { Opt_sec_lkeyp, "lkeyp" },
217
218 { Opt_sec_err, NULL }
219};
220
221
f7b422b1 222static void nfs_umount_begin(struct vfsmount *, int);
816724e6 223static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 224static int nfs_show_options(struct seq_file *, struct vfsmount *);
225static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 226static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 227static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 228 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 229static void nfs_kill_super(struct super_block *);
230
231static struct file_system_type nfs_fs_type = {
232 .owner = THIS_MODULE,
233 .name = "nfs",
234 .get_sb = nfs_get_sb,
235 .kill_sb = nfs_kill_super,
349457cc 236 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 237};
238
54ceac45 239struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 240 .owner = THIS_MODULE,
241 .name = "nfs",
54ceac45 242 .get_sb = nfs_xdev_get_sb,
f7b422b1 243 .kill_sb = nfs_kill_super,
349457cc 244 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 245};
246
ee9b6d61 247static const struct super_operations nfs_sops = {
f7b422b1
DH		 248 .alloc_inode = nfs_alloc_inode,
249 .destroy_inode = nfs_destroy_inode,
250 .write_inode = nfs_write_inode,
251 .statfs = nfs_statfs,
252 .clear_inode = nfs_clear_inode,
253 .umount_begin = nfs_umount_begin,
254 .show_options = nfs_show_options,
255 .show_stats = nfs_show_stats,
256};
257
258#ifdef CONFIG_NFS_V4
816724e6
TM		 259static int nfs4_get_sb(struct file_system_type *fs_type,
260 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 261static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
262 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
263static int nfs4_referral_get_sb(struct file_system_type *fs_type,
264 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 265static void nfs4_kill_super(struct super_block *sb);
266
267static struct file_system_type nfs4_fs_type = {
268 .owner = THIS_MODULE,
269 .name = "nfs4",
270 .get_sb = nfs4_get_sb,
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
54ceac45 275struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 276 .owner = THIS_MODULE,
277 .name = "nfs4",
54ceac45 278 .get_sb = nfs4_xdev_get_sb,
f7b422b1 279 .kill_sb = nfs4_kill_super,
349457cc 280 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 281};
282
54ceac45 283struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 284 .owner = THIS_MODULE,
285 .name = "nfs4",
54ceac45 286 .get_sb = nfs4_referral_get_sb,
f7b422b1 287 .kill_sb = nfs4_kill_super,
349457cc 288 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 289};
290
ee9b6d61 291static const struct super_operations nfs4_sops = {
f7b422b1
DH		 292 .alloc_inode = nfs_alloc_inode,
293 .destroy_inode = nfs_destroy_inode,
294 .write_inode = nfs_write_inode,
295 .statfs = nfs_statfs,
296 .clear_inode = nfs4_clear_inode,
297 .umount_begin = nfs_umount_begin,
298 .show_options = nfs_show_options,
299 .show_stats = nfs_show_stats,
300};
301#endif
302
8e1f936b
RR		 303static struct shrinker acl_shrinker = {
304 .shrink = nfs_access_cache_shrinker,
305 .seeks = DEFAULT_SEEKS,
306};
979df72e 307
f7b422b1
DH		 308/*
309 * Register the NFS filesystems
310 */
311int __init register_nfs_fs(void)
312{
313 int ret;
314
315 ret = register_filesystem(&nfs_fs_type);
316 if (ret < 0)
317 goto error_0;
318
f7b422b1
DH		 319 ret = nfs_register_sysctl();
320 if (ret < 0)
321 goto error_1;
89a09141 322#ifdef CONFIG_NFS_V4
f7b422b1
DH		 323 ret = register_filesystem(&nfs4_fs_type);
324 if (ret < 0)
325 goto error_2;
326#endif
8e1f936b 327 register_shrinker(&acl_shrinker);
f7b422b1
DH		 328 return 0;
329
330#ifdef CONFIG_NFS_V4
331error_2:
332 nfs_unregister_sysctl();
89a09141 333#endif
f7b422b1
DH		 334error_1:
335 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 336error_0:
337 return ret;
338}
339
340/*
341 * Unregister the NFS filesystems
342 */
343void __exit unregister_nfs_fs(void)
344{
8e1f936b 345 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 346#ifdef CONFIG_NFS_V4
347 unregister_filesystem(&nfs4_fs_type);
348 nfs_unregister_sysctl();
349#endif
350 unregister_filesystem(&nfs_fs_type);
351}
352
353/*
354 * Deliver file system statistics to userspace
355 */
816724e6 356static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 357{
0c7d90cf 358 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 359 unsigned char blockbits;
360 unsigned long blockres;
0c7d90cf 361 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 362 struct nfs_fattr fattr;
363 struct nfs_fsstat res = {
364 .fattr = &fattr,
365 };
366 int error;
367
368 lock_kernel();
369
8fa5c000 370 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 371 if (error < 0)
372 goto out_err;
1a0ba9ae 373 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 374
375 /*
376 * Current versions of glibc do not correctly handle the
377 * case where f_frsize != f_bsize. Eventually we want to
378 * report the value of wtmult in this field.
379 */
0c7d90cf 380 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 381
382 /*
383 * On most *nix systems, f_blocks, f_bfree, and f_bavail
384 * are reported in units of f_frsize. Linux hasn't had
385 * an f_frsize field in its statfs struct until recently,
386 * thus historically Linux's sys_statfs reports these
387 * fields in units of f_bsize.
388 */
0c7d90cf
DH		 389 buf->f_bsize = dentry->d_sb->s_blocksize;
390 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 391 blockres = (1 << blockbits) - 1;
392 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
393 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
394 buf->f_bavail = (res.abytes + blockres) >> blockbits;
395
396 buf->f_files = res.tfiles;
397 buf->f_ffree = res.afiles;
398
399 buf->f_namelen = server->namelen;
1a0ba9ae 400
f7b422b1
DH		 401 unlock_kernel();
402 return 0;
403
404 out_err:
405 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
1a0ba9ae
AA		 406 unlock_kernel();
407 return error;
f7b422b1
DH		 408}
409
7d4e2747
DH		 410/*
411 * Map the security flavour number to a name
412 */
81039f1f
TM		 413static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
414{
7d4e2747 415 static const struct {
81039f1f
TM		 416 rpc_authflavor_t flavour;
417 const char *str;
418 } sec_flavours[] = {
419 { RPC_AUTH_NULL, "null" },
420 { RPC_AUTH_UNIX, "sys" },
421 { RPC_AUTH_GSS_KRB5, "krb5" },
422 { RPC_AUTH_GSS_KRB5I, "krb5i" },
423 { RPC_AUTH_GSS_KRB5P, "krb5p" },
424 { RPC_AUTH_GSS_LKEY, "lkey" },
425 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
426 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
427 { RPC_AUTH_GSS_SPKM, "spkm" },
428 { RPC_AUTH_GSS_SPKMI, "spkmi" },
429 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 430 { UINT_MAX, "unknown" }
81039f1f
TM		 431 };
432 int i;
433
4d81cd16 434 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 435 if (sec_flavours[i].flavour == flavour)
436 break;
437 }
438 return sec_flavours[i].str;
439}
440
f7b422b1
DH		 441/*
442 * Describe the mount options in force on this server representation
443 */
444static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
445{
509de811 446 static const struct proc_nfs_info {
f7b422b1 447 int flag;
509de811
DH		 448 const char *str;
449 const char *nostr;
f7b422b1
DH		 450 } nfs_info[] = {
451 { NFS_MOUNT_SOFT, ",soft", ",hard" },
452 { NFS_MOUNT_INTR, ",intr", "" },
453 { NFS_MOUNT_NOCTO, ",nocto", "" },
454 { NFS_MOUNT_NOAC, ",noac", "" },
455 { NFS_MOUNT_NONLM, ",nolock", "" },
456 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 457 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
75180df2 458 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
f7b422b1
DH		 459 { 0, NULL, NULL }
460 };
509de811 461 const struct proc_nfs_info *nfs_infop;
8fa5c000 462 struct nfs_client *clp = nfss->nfs_client;
f7b422b1 463 char buf[12];
509de811 464 const char *proto;
f7b422b1 465
8fa5c000 466 seq_printf(m, ",vers=%d", clp->rpc_ops->version);
f7b422b1
DH		 467 seq_printf(m, ",rsize=%d", nfss->rsize);
468 seq_printf(m, ",wsize=%d", nfss->wsize);
469 if (nfss->acregmin != 3*HZ || showdefaults)
470 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
471 if (nfss->acregmax != 60*HZ || showdefaults)
472 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
473 if (nfss->acdirmin != 30*HZ || showdefaults)
474 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
475 if (nfss->acdirmax != 60*HZ || showdefaults)
476 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
477 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
478 if (nfss->flags & nfs_infop->flag)
479 seq_puts(m, nfs_infop->str);
480 else
481 seq_puts(m, nfs_infop->nostr);
482 }
483 switch (nfss->client->cl_xprt->prot) {
484 case IPPROTO_TCP:
485 proto = "tcp";
486 break;
487 case IPPROTO_UDP:
488 proto = "udp";
489 break;
490 default:
491 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
492 proto = buf;
493 }
494 seq_printf(m, ",proto=%s", proto);
5006a76c
DH		 495 seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
496 seq_printf(m, ",retrans=%u", clp->retrans_count);
81039f1f 497 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
f7b422b1
DH		 498}
499
500/*
501 * Describe the mount options on this VFS mountpoint
502 */
503static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
504{
505 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
506
507 nfs_show_mount_options(m, nfss, 0);
508
509 seq_puts(m, ",addr=");
54ceac45 510 seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\");
f7b422b1
DH		 511
512 return 0;
513}
514
515/*
516 * Present statistical information for this VFS mountpoint
517 */
518static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
519{
520 int i, cpu;
521 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
522 struct rpc_auth *auth = nfss->client->cl_auth;
523 struct nfs_iostats totals = { };
524
525 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
526
527 /*
528 * Display all mount option settings
529 */
530 seq_printf(m, "\n\topts:\t");
531 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
532 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
533 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
534 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
535 nfs_show_mount_options(m, nfss, 1);
536
537 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
538
539 seq_printf(m, "\n\tcaps:\t");
540 seq_printf(m, "caps=0x%x", nfss->caps);
541 seq_printf(m, ",wtmult=%d", nfss->wtmult);
542 seq_printf(m, ",dtsize=%d", nfss->dtsize);
543 seq_printf(m, ",bsize=%d", nfss->bsize);
544 seq_printf(m, ",namelen=%d", nfss->namelen);
545
546#ifdef CONFIG_NFS_V4
8fa5c000 547 if (nfss->nfs_client->cl_nfsversion == 4) {
f7b422b1
DH		 548 seq_printf(m, "\n\tnfsv4:\t");
549 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
550 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
551 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
552 }
553#endif
554
555 /*
556 * Display security flavor in effect for this mount
557 */
558 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
559 if (auth->au_flavor)
560 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
561
562 /*
563 * Display superblock I/O counters
564 */
565 for_each_possible_cpu(cpu) {
566 struct nfs_iostats *stats;
567
568 preempt_disable();
569 stats = per_cpu_ptr(nfss->io_stats, cpu);
570
571 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
572 totals.events[i] += stats->events[i];
573 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
574 totals.bytes[i] += stats->bytes[i];
575
576 preempt_enable();
577 }
578
579 seq_printf(m, "\n\tevents:\t");
580 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
581 seq_printf(m, "%lu ", totals.events[i]);
582 seq_printf(m, "\n\tbytes:\t");
583 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
584 seq_printf(m, "%Lu ", totals.bytes[i]);
585 seq_printf(m, "\n");
586
587 rpc_print_iostats(m, nfss->client);
588
589 return 0;
590}
591
592/*
593 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 594 * in response to xdev traversals and referrals
f7b422b1
DH		 595 */
596static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
597{
fc6ae3cf
TM		 598 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
599 struct rpc_clnt *rpc;
600
f7b422b1 601 shrink_submounts(vfsmnt, &nfs_automount_list);
fc6ae3cf
TM		 602
603 if (!(flags & MNT_FORCE))
604 return;
605 /* -EIO all pending I/O */
606 rpc = server->client_acl;
607 if (!IS_ERR(rpc))
608 rpc_killall_tasks(rpc);
609 rpc = server->client;
610 if (!IS_ERR(rpc))
611 rpc_killall_tasks(rpc);
f7b422b1
DH		 612}
613
fc50d58f
CL		 614/*
615 * Sanity-check a server address provided by the mount command
616 */
617static int nfs_verify_server_address(struct sockaddr *addr)
618{
619 switch (addr->sa_family) {
620 case AF_INET: {
621 struct sockaddr_in *sa = (struct sockaddr_in *) addr;
622 if (sa->sin_addr.s_addr != INADDR_ANY)
623 return 1;
624 break;
625 }
626 }
627
628 return 0;
629}
630
bf0fd768
CL		 631/*
632 * Error-check and convert a string of mount options from user space into
633 * a data structure
634 */
635static int nfs_parse_mount_options(char *raw,
636 struct nfs_parsed_mount_data *mnt)
637{
638 char *p, *string;
639
640 if (!raw) {
641 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
642 return 1;
643 }
644 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
645
646 while ((p = strsep(&raw, ",")) != NULL) {
647 substring_t args[MAX_OPT_ARGS];
648 int option, token;
649
650 if (!*p)
651 continue;
652
653 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
654
655 token = match_token(p, nfs_mount_option_tokens, args);
656 switch (token) {
657 case Opt_soft:
658 mnt->flags |= NFS_MOUNT_SOFT;
659 break;
660 case Opt_hard:
661 mnt->flags &= ~NFS_MOUNT_SOFT;
662 break;
663 case Opt_intr:
664 mnt->flags |= NFS_MOUNT_INTR;
665 break;
666 case Opt_nointr:
667 mnt->flags &= ~NFS_MOUNT_INTR;
668 break;
669 case Opt_posix:
670 mnt->flags |= NFS_MOUNT_POSIX;
671 break;
672 case Opt_noposix:
673 mnt->flags &= ~NFS_MOUNT_POSIX;
674 break;
675 case Opt_cto:
676 mnt->flags &= ~NFS_MOUNT_NOCTO;
677 break;
678 case Opt_nocto:
679 mnt->flags |= NFS_MOUNT_NOCTO;
680 break;
681 case Opt_ac:
682 mnt->flags &= ~NFS_MOUNT_NOAC;
683 break;
684 case Opt_noac:
685 mnt->flags |= NFS_MOUNT_NOAC;
686 break;
687 case Opt_lock:
688 mnt->flags &= ~NFS_MOUNT_NONLM;
689 break;
690 case Opt_nolock:
691 mnt->flags |= NFS_MOUNT_NONLM;
692 break;
693 case Opt_v2:
694 mnt->flags &= ~NFS_MOUNT_VER3;
695 break;
696 case Opt_v3:
697 mnt->flags |= NFS_MOUNT_VER3;
698 break;
699 case Opt_udp:
700 mnt->flags &= ~NFS_MOUNT_TCP;
701 mnt->nfs_server.protocol = IPPROTO_UDP;
702 mnt->timeo = 7;
703 mnt->retrans = 5;
704 break;
705 case Opt_tcp:
706 mnt->flags |= NFS_MOUNT_TCP;
707 mnt->nfs_server.protocol = IPPROTO_TCP;
708 mnt->timeo = 600;
709 mnt->retrans = 2;
710 break;
711 case Opt_acl:
712 mnt->flags &= ~NFS_MOUNT_NOACL;
713 break;
714 case Opt_noacl:
715 mnt->flags |= NFS_MOUNT_NOACL;
716 break;
717 case Opt_rdirplus:
718 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
719 break;
720 case Opt_nordirplus:
721 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
722 break;
75180df2
TM		 723 case Opt_sharecache:
724 mnt->flags &= ~NFS_MOUNT_UNSHARED;
725 break;
726 case Opt_nosharecache:
727 mnt->flags |= NFS_MOUNT_UNSHARED;
728 break;
bf0fd768
CL		 729
730 case Opt_port:
731 if (match_int(args, &option))
732 return 0;
733 if (option < 0 || option > 65535)
734 return 0;
735 mnt->nfs_server.address.sin_port = htonl(option);
736 break;
737 case Opt_rsize:
738 if (match_int(args, &mnt->rsize))
739 return 0;
740 break;
741 case Opt_wsize:
742 if (match_int(args, &mnt->wsize))
743 return 0;
744 break;
745 case Opt_bsize:
746 if (match_int(args, &option))
747 return 0;
748 if (option < 0)
749 return 0;
750 mnt->bsize = option;
751 break;
752 case Opt_timeo:
753 if (match_int(args, &mnt->timeo))
754 return 0;
755 break;
756 case Opt_retrans:
757 if (match_int(args, &mnt->retrans))
758 return 0;
759 break;
760 case Opt_acregmin:
761 if (match_int(args, &mnt->acregmin))
762 return 0;
763 break;
764 case Opt_acregmax:
765 if (match_int(args, &mnt->acregmax))
766 return 0;
767 break;
768 case Opt_acdirmin:
769 if (match_int(args, &mnt->acdirmin))
770 return 0;
771 break;
772 case Opt_acdirmax:
773 if (match_int(args, &mnt->acdirmax))
774 return 0;
775 break;
776 case Opt_actimeo:
777 if (match_int(args, &option))
778 return 0;
779 if (option < 0)
780 return 0;
781 mnt->acregmin =
782 mnt->acregmax =
783 mnt->acdirmin =
784 mnt->acdirmax = option;
785 break;
786 case Opt_namelen:
787 if (match_int(args, &mnt->namlen))
788 return 0;
789 break;
790 case Opt_mountport:
791 if (match_int(args, &option))
792 return 0;
793 if (option < 0 || option > 65535)
794 return 0;
795 mnt->mount_server.port = option;
796 break;
797 case Opt_mountprog:
798 if (match_int(args, &option))
799 return 0;
800 if (option < 0)
801 return 0;
802 mnt->mount_server.program = option;
803 break;
804 case Opt_mountvers:
805 if (match_int(args, &option))
806 return 0;
807 if (option < 0)
808 return 0;
809 mnt->mount_server.version = option;
810 break;
811 case Opt_nfsprog:
812 if (match_int(args, &option))
813 return 0;
814 if (option < 0)
815 return 0;
816 mnt->nfs_server.program = option;
817 break;
818 case Opt_nfsvers:
819 if (match_int(args, &option))
820 return 0;
821 switch (option) {
822 case 2:
823 mnt->flags &= ~NFS_MOUNT_VER3;
824 break;
825 case 3:
826 mnt->flags |= NFS_MOUNT_VER3;
827 break;
828 default:
829 goto out_unrec_vers;
830 }
831 break;
832
833 case Opt_sec:
834 string = match_strdup(args);
835 if (string == NULL)
836 goto out_nomem;
837 token = match_token(string, nfs_secflavor_tokens, args);
838 kfree(string);
839
840 /*
841 * The flags setting is for v2/v3. The flavor_len
842 * setting is for v4. v2/v3 also need to know the
843 * difference between NULL and UNIX.
844 */
845 switch (token) {
846 case Opt_sec_none:
847 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
848 mnt->auth_flavor_len = 0;
849 mnt->auth_flavors[0] = RPC_AUTH_NULL;
850 break;
851 case Opt_sec_sys:
852 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
853 mnt->auth_flavor_len = 0;
854 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
855 break;
856 case Opt_sec_krb5:
857 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
858 mnt->auth_flavor_len = 1;
859 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
860 break;
861 case Opt_sec_krb5i:
862 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
863 mnt->auth_flavor_len = 1;
864 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
865 break;
866 case Opt_sec_krb5p:
867 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
868 mnt->auth_flavor_len = 1;
869 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
870 break;
871 case Opt_sec_lkey:
872 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
873 mnt->auth_flavor_len = 1;
874 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
875 break;
876 case Opt_sec_lkeyi:
877 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
878 mnt->auth_flavor_len = 1;
879 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
880 break;
881 case Opt_sec_lkeyp:
882 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
883 mnt->auth_flavor_len = 1;
884 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
885 break;
886 case Opt_sec_spkm:
887 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
888 mnt->auth_flavor_len = 1;
889 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
890 break;
891 case Opt_sec_spkmi:
892 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
893 mnt->auth_flavor_len = 1;
894 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
895 break;
896 case Opt_sec_spkmp:
897 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
898 mnt->auth_flavor_len = 1;
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
900 break;
901 default:
902 goto out_unrec_sec;
903 }
904 break;
905 case Opt_proto:
906 string = match_strdup(args);
907 if (string == NULL)
908 goto out_nomem;
909 token = match_token(string,
910 nfs_xprt_protocol_tokens, args);
911 kfree(string);
912
913 switch (token) {
914 case Opt_udp:
915 mnt->flags &= ~NFS_MOUNT_TCP;
916 mnt->nfs_server.protocol = IPPROTO_UDP;
917 mnt->timeo = 7;
918 mnt->retrans = 5;
919 break;
920 case Opt_tcp:
921 mnt->flags |= NFS_MOUNT_TCP;
922 mnt->nfs_server.protocol = IPPROTO_TCP;
923 mnt->timeo = 600;
924 mnt->retrans = 2;
925 break;
926 default:
927 goto out_unrec_xprt;
928 }
929 break;
930 case Opt_mountproto:
931 string = match_strdup(args);
932 if (string == NULL)
933 goto out_nomem;
934 token = match_token(string,
935 nfs_xprt_protocol_tokens, args);
936 kfree(string);
937
938 switch (token) {
939 case Opt_udp:
940 mnt->mount_server.protocol = IPPROTO_UDP;
941 break;
942 case Opt_tcp:
943 mnt->mount_server.protocol = IPPROTO_TCP;
944 break;
945 default:
946 goto out_unrec_xprt;
947 }
948 break;
949 case Opt_addr:
950 string = match_strdup(args);
951 if (string == NULL)
952 goto out_nomem;
953 mnt->nfs_server.address.sin_family = AF_INET;
954 mnt->nfs_server.address.sin_addr.s_addr =
955 in_aton(string);
956 kfree(string);
957 break;
958 case Opt_clientaddr:
959 string = match_strdup(args);
960 if (string == NULL)
961 goto out_nomem;
962 mnt->client_address = string;
963 break;
964 case Opt_mounthost:
965 string = match_strdup(args);
966 if (string == NULL)
967 goto out_nomem;
968 mnt->mount_server.address.sin_family = AF_INET;
969 mnt->mount_server.address.sin_addr.s_addr =
970 in_aton(string);
971 kfree(string);
972 break;
973
974 case Opt_userspace:
975 case Opt_deprecated:
976 break;
977
978 default:
979 goto out_unknown;
980 }
981 }
982
983 return 1;
984
985out_nomem:
986 printk(KERN_INFO "NFS: not enough memory to parse option\n");
987 return 0;
988
989out_unrec_vers:
990 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
991 return 0;
992
993out_unrec_xprt:
994 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
995 return 0;
996
997out_unrec_sec:
998 printk(KERN_INFO "NFS: unrecognized security flavor\n");
999 return 0;
1000
1001out_unknown:
1002 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1003 return 0;
1004}
1005
0076d7b7
CL		 1006/*
1007 * Use the remote server's MOUNT service to request the NFS file handle
1008 * corresponding to the provided path.
1009 */
1010static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1011 struct nfs_fh *root_fh)
1012{
1013 struct sockaddr_in sin;
1014 int status;
1015
1016 if (args->mount_server.version == 0) {
1017 if (args->flags & NFS_MOUNT_VER3)
1018 args->mount_server.version = NFS_MNT3_VERSION;
1019 else
1020 args->mount_server.version = NFS_MNT_VERSION;
1021 }
1022
1023 /*
1024 * Construct the mount server's address.
1025 */
1026 if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY)
1027 sin = args->mount_server.address;
1028 else
1029 sin = args->nfs_server.address;
1030 if (args->mount_server.port == 0) {
1031 status = rpcb_getport_sync(&sin,
1032 args->mount_server.program,
1033 args->mount_server.version,
1034 args->mount_server.protocol);
1035 if (status < 0)
1036 goto out_err;
1037 sin.sin_port = htons(status);
1038 } else
1039 sin.sin_port = htons(args->mount_server.port);
1040
1041 /*
1042 * Now ask the mount server to map our export path
1043 * to a file handle.
1044 */
1045 status = nfs_mount((struct sockaddr *) &sin,
1046 sizeof(sin),
1047 args->nfs_server.hostname,
1048 args->nfs_server.export_path,
1049 args->mount_server.version,
1050 args->mount_server.protocol,
1051 root_fh);
1052 if (status < 0)
1053 goto out_err;
1054
1055 return status;
1056
1057out_err:
1058 dfprintk(MOUNT, "NFS: unable to contact server on host "
1059 NIPQUAD_FMT "\n", NIPQUAD(sin.sin_addr.s_addr));
1060 return status;
1061}
1062
f7b422b1 1063/*
54ceac45
DH		 1064 * Validate the NFS2/NFS3 mount data
1065 * - fills in the mount root filehandle
136d558c
CL		 1066 *
1067 * For option strings, user space handles the following behaviors:
1068 *
1069 * + DNS: mapping server host name to IP address ("addr=" option)
1070 *
1071 * + failure mode: how to behave if a mount request can't be handled
1072 * immediately ("fg/bg" option)
1073 *
1074 * + retry: how often to retry a mount request ("retry=" option)
1075 *
1076 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1077 * mountproto=tcp after mountproto=udp, and so on
1078 *
1079 * XXX: as far as I can tell, changing the NFS program number is not
1080 * supported in the NFS client.
f7b422b1 1081 */
136d558c
CL		 1082static int nfs_validate_mount_data(struct nfs_mount_data **options,
1083 struct nfs_fh *mntfh,
1084 const char *dev_name)
f7b422b1 1085{
136d558c
CL		 1086 struct nfs_mount_data *data = *options;
1087
5df36e78
CL		 1088 if (data == NULL)
1089 goto out_no_data;
f7b422b1 1090
54ceac45 1091 switch (data->version) {
5df36e78
CL		 1092 case 1:
1093 data->namlen = 0;
1094 case 2:
1095 data->bsize = 0;
1096 case 3:
1097 if (data->flags & NFS_MOUNT_VER3)
1098 goto out_no_v3;
1099 data->root.size = NFS2_FHSIZE;
1100 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1101 case 4:
1102 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1103 goto out_no_sec;
1104 case 5:
1105 memset(data->context, 0, sizeof(data->context));
1106 case 6:
1107 if (data->flags & NFS_MOUNT_VER3)
1108 mntfh->size = data->root.size;
1109 else
1110 mntfh->size = NFS2_FHSIZE;
1111
1112 if (mntfh->size > sizeof(mntfh->data))
1113 goto out_invalid_fh;
1114
1115 memcpy(mntfh->data, data->root.data, mntfh->size);
1116 if (mntfh->size < sizeof(mntfh->data))
1117 memset(mntfh->data + mntfh->size, 0,
1118 sizeof(mntfh->data) - mntfh->size);
1119 break;
136d558c
CL		 1120 default: {
1121 unsigned int len;
1122 char *c;
1123 int status;
1124 struct nfs_parsed_mount_data args = {
1125 .flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP),
1126 .rsize = NFS_MAX_FILE_IO_SIZE,
1127 .wsize = NFS_MAX_FILE_IO_SIZE,
1128 .timeo = 600,
1129 .retrans = 2,
1130 .acregmin = 3,
1131 .acregmax = 60,
1132 .acdirmin = 30,
1133 .acdirmax = 60,
1134 .mount_server.protocol = IPPROTO_UDP,
1135 .mount_server.program = NFS_MNT_PROGRAM,
1136 .nfs_server.protocol = IPPROTO_TCP,
1137 .nfs_server.program = NFS_PROGRAM,
1138 };
1139
1140 if (nfs_parse_mount_options((char *) *options, &args) == 0)
1141 return -EINVAL;
1142
1143 data = kzalloc(sizeof(*data), GFP_KERNEL);
1144 if (data == NULL)
1145 return -ENOMEM;
1146
1147 /*
1148 * NB: after this point, caller will free "data"
1149 * if we return an error
1150 */
1151 *options = data;
1152
1153 c = strchr(dev_name, ':');
1154 if (c == NULL)
1155 return -EINVAL;
1156 len = c - dev_name - 1;
1157 if (len > sizeof(data->hostname))
1158 return -EINVAL;
1159 strncpy(data->hostname, dev_name, len);
1160 args.nfs_server.hostname = data->hostname;
1161
1162 c++;
1163 if (strlen(c) > NFS_MAXPATHLEN)
1164 return -EINVAL;
1165 args.nfs_server.export_path = c;
1166
1167 status = nfs_try_mount(&args, mntfh);
1168 if (status)
1169 return -EINVAL;
1170
1171 /*
1172 * Translate to nfs_mount_data, which nfs_fill_super
1173 * can deal with.
1174 */
1175 data->version = 6;
1176 data->flags = args.flags;
1177 data->rsize = args.rsize;
1178 data->wsize = args.wsize;
1179 data->timeo = args.timeo;
1180 data->retrans = args.retrans;
1181 data->acregmin = args.acregmin;
1182 data->acregmax = args.acregmax;
1183 data->acdirmin = args.acdirmin;
1184 data->acdirmax = args.acdirmax;
1185 data->addr = args.nfs_server.address;
1186 data->namlen = args.namlen;
1187 data->bsize = args.bsize;
1188 data->pseudoflavor = args.auth_flavors[0];
1189
1190 break;
1191 }
f7b422b1 1192 }
54ceac45 1193
36b15c54
TM		 1194 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
1195 data->pseudoflavor = RPC_AUTH_UNIX;
1196
54ceac45 1197#ifndef CONFIG_NFS_V3
5df36e78
CL		 1198 if (data->flags & NFS_MOUNT_VER3)
1199 goto out_v3_not_compiled;
1200#endif /* !CONFIG_NFS_V3 */
f7b422b1 1201
5df36e78
CL		 1202 if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
1203 goto out_no_address;
f7b422b1 1204
5df36e78 1205 return 0;
f7b422b1 1206
5df36e78
CL		 1207out_no_data:
1208 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1209 return -EINVAL;
54ceac45 1210
5df36e78
CL		 1211out_no_v3:
1212 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1213 data->version);
1214 return -EINVAL;
f7b422b1 1215
5df36e78
CL		 1216out_no_sec:
1217 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1218 return -EINVAL;
1219
5df36e78
CL		 1220#ifndef CONFIG_NFS_V3
1221out_v3_not_compiled:
1222 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1223 return -EPROTONOSUPPORT;
1224#endif /* !CONFIG_NFS_V3 */
1225
1226out_no_address:
1227 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1228 return -EINVAL;
1229
1230out_invalid_fh:
1231 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1232 return -EINVAL;
f7b422b1
DH		 1233}
1234
f7b422b1 1235/*
54ceac45 1236 * Initialise the common bits of the superblock
f7b422b1 1237 */
54ceac45 1238static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1239{
54ceac45 1240 struct nfs_server *server = NFS_SB(sb);
5006a76c 1241
54ceac45 1242 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1243
54ceac45
DH		 1244 /* We probably want something more informative here */
1245 snprintf(sb->s_id, sizeof(sb->s_id),
1246 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1247
54ceac45
DH		 1248 if (sb->s_blocksize == 0)
1249 sb->s_blocksize = nfs_block_bits(server->wsize,
1250 &sb->s_blocksize_bits);
f7b422b1 1251
54ceac45
DH		 1252 if (server->flags & NFS_MOUNT_NOAC)
1253 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1254
54ceac45 1255 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1256}
1257
1258/*
54ceac45 1259 * Finish setting up an NFS2/3 superblock
f7b422b1 1260 */
54ceac45 1261static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data)
f7b422b1
DH		 1262{
1263 struct nfs_server *server = NFS_SB(sb);
5006a76c 1264
54ceac45
DH		 1265 sb->s_blocksize_bits = 0;
1266 sb->s_blocksize = 0;
1267 if (data->bsize)
1268 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1269
54ceac45
DH		 1270 if (server->flags & NFS_MOUNT_VER3) {
1271 /* The VFS shouldn't apply the umask to mode bits. We will do
1272 * so ourselves when necessary.
1273 */
1274 sb->s_flags |= MS_POSIXACL;
1275 sb->s_time_gran = 1;
816724e6 1276 }
54ceac45
DH		 1277
1278 sb->s_op = &nfs_sops;
1279 nfs_initialise_sb(sb);
f7b422b1
DH		 1280}
1281
1282/*
54ceac45 1283 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1284 */
54ceac45
DH		 1285static void nfs_clone_super(struct super_block *sb,
1286 const struct super_block *old_sb)
f7b422b1 1287{
54ceac45
DH		 1288 struct nfs_server *server = NFS_SB(sb);
1289
1290 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1291 sb->s_blocksize = old_sb->s_blocksize;
1292 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1293
f7b422b1 1294 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1295 /* The VFS shouldn't apply the umask to mode bits. We will do
1296 * so ourselves when necessary.
f7b422b1
DH		 1297 */
1298 sb->s_flags |= MS_POSIXACL;
f7b422b1 1299 sb->s_time_gran = 1;
f7b422b1
DH		 1300 }
1301
54ceac45
DH		 1302 sb->s_op = old_sb->s_op;
1303 nfs_initialise_sb(sb);
f7b422b1
DH		 1304}
1305
54ceac45 1306static int nfs_set_super(struct super_block *s, void *_server)
f7b422b1 1307{
54ceac45
DH		 1308 struct nfs_server *server = _server;
1309 int ret;
1310
1311 s->s_fs_info = server;
1312 ret = set_anon_super(s, server);
1313 if (ret == 0)
1314 server->s_dev = s->s_dev;
1315 return ret;
f7b422b1
DH		 1316}
1317
1318static int nfs_compare_super(struct super_block *sb, void *data)
1319{
54ceac45 1320 struct nfs_server *server = data, *old = NFS_SB(sb);
f7b422b1 1321
275a5d24
TM		 1322 if (memcmp(&old->nfs_client->cl_addr,
1323 &server->nfs_client->cl_addr,
1324 sizeof(old->nfs_client->cl_addr)) != 0)
f7b422b1 1325 return 0;
75180df2
TM		 1326 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1327 if (old->flags & NFS_MOUNT_UNSHARED)
1328 return 0;
54ceac45 1329 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
f7b422b1 1330 return 0;
54ceac45 1331 return 1;
f7b422b1
DH		 1332}
1333
275a5d24
TM		 1334#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1335
1336static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1337{
1338 const struct nfs_server *a = s->s_fs_info;
1339 const struct rpc_clnt *clnt_a = a->client;
1340 const struct rpc_clnt *clnt_b = b->client;
1341
1342 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1343 goto Ebusy;
1344 if (a->nfs_client != b->nfs_client)
1345 goto Ebusy;
1346 if (a->flags != b->flags)
1347 goto Ebusy;
1348 if (a->wsize != b->wsize)
1349 goto Ebusy;
1350 if (a->rsize != b->rsize)
1351 goto Ebusy;
1352 if (a->acregmin != b->acregmin)
1353 goto Ebusy;
1354 if (a->acregmax != b->acregmax)
1355 goto Ebusy;
1356 if (a->acdirmin != b->acdirmin)
1357 goto Ebusy;
1358 if (a->acdirmax != b->acdirmax)
1359 goto Ebusy;
1360 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1361 goto Ebusy;
1362 return 0;
1363Ebusy:
1364 return -EBUSY;
1365}
1366
816724e6
TM		 1367static int nfs_get_sb(struct file_system_type *fs_type,
1368 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 1369{
f7b422b1
DH		 1370 struct nfs_server *server = NULL;
1371 struct super_block *s;
54ceac45 1372 struct nfs_fh mntfh;
f7b422b1 1373 struct nfs_mount_data *data = raw_data;
54ceac45 1374 struct dentry *mntroot;
75180df2 1375 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
54ceac45 1376 int error;
f7b422b1 1377
54ceac45 1378 /* Validate the mount data */
136d558c 1379 error = nfs_validate_mount_data(&data, &mntfh, dev_name);
54ceac45 1380 if (error < 0)
0655960f 1381 goto out;
f7b422b1 1382
54ceac45
DH		 1383 /* Get a volume representation */
1384 server = nfs_create_server(data, &mntfh);
1385 if (IS_ERR(server)) {
1386 error = PTR_ERR(server);
0655960f 1387 goto out;
f7b422b1
DH		 1388 }
1389
75180df2
TM		 1390 if (server->flags & NFS_MOUNT_UNSHARED)
1391 compare_super = NULL;
1392
54ceac45 1393 /* Get a superblock - note that we may end up sharing one that already exists */
75180df2 1394 s = sget(fs_type, compare_super, nfs_set_super, server);
816724e6
TM		 1395 if (IS_ERR(s)) {
1396 error = PTR_ERR(s);
54ceac45 1397 goto out_err_nosb;
816724e6
TM		 1398 }
1399
54ceac45 1400 if (s->s_fs_info != server) {
275a5d24 1401 error = nfs_compare_mount_options(s, server, flags);
54ceac45
DH		 1402 nfs_free_server(server);
1403 server = NULL;
275a5d24
TM		 1404 if (error < 0)
1405 goto error_splat_super;
54ceac45 1406 }
f7b422b1 1407
54ceac45
DH		 1408 if (!s->s_root) {
1409 /* initial superblock/root creation */
1410 s->s_flags = flags;
1411 nfs_fill_super(s, data);
1412 }
f7b422b1 1413
54ceac45
DH		 1414 mntroot = nfs_get_root(s, &mntfh);
1415 if (IS_ERR(mntroot)) {
1416 error = PTR_ERR(mntroot);
1417 goto error_splat_super;
f7b422b1 1418 }
816724e6 1419
54ceac45
DH		 1420 s->s_flags |= MS_ACTIVE;
1421 mnt->mnt_sb = s;
1422 mnt->mnt_root = mntroot;
0655960f
CL		 1423 error = 0;
1424
1425out:
136d558c
CL		 1426 if (data != raw_data)
1427 kfree(data);
0655960f 1428 return error;
816724e6 1429
54ceac45
DH		 1430out_err_nosb:
1431 nfs_free_server(server);
0655960f 1432 goto out;
54ceac45
DH		 1433
1434error_splat_super:
1435 up_write(&s->s_umount);
1436 deactivate_super(s);
0655960f 1437 goto out;
f7b422b1
DH		 1438}
1439
54ceac45
DH		 1440/*
1441 * Destroy an NFS2/3 superblock
1442 */
f7b422b1
DH		 1443static void nfs_kill_super(struct super_block *s)
1444{
1445 struct nfs_server *server = NFS_SB(s);
1446
1447 kill_anon_super(s);
54ceac45 1448 nfs_free_server(server);
f7b422b1
DH		 1449}
1450
54ceac45
DH		 1451/*
1452 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1453 */
1454static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1455 const char *dev_name, void *raw_data,
1456 struct vfsmount *mnt)
f7b422b1
DH		 1457{
1458 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 1459 struct super_block *s;
1460 struct nfs_server *server;
1461 struct dentry *mntroot;
75180df2 1462 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
54ceac45 1463 int error;
f7b422b1 1464
54ceac45 1465 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 1466
54ceac45
DH		 1467 /* create a new volume representation */
1468 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1469 if (IS_ERR(server)) {
1470 error = PTR_ERR(server);
1471 goto out_err_noserver;
1472 }
8fa5c000 1473
75180df2
TM		 1474 if (server->flags & NFS_MOUNT_UNSHARED)
1475 compare_super = NULL;
1476
54ceac45 1477 /* Get a superblock - note that we may end up sharing one that already exists */
75180df2 1478 s = sget(&nfs_fs_type, compare_super, nfs_set_super, server);
54ceac45
DH		 1479 if (IS_ERR(s)) {
1480 error = PTR_ERR(s);
1481 goto out_err_nosb;
1482 }
5006a76c 1483
54ceac45 1484 if (s->s_fs_info != server) {
275a5d24 1485 error = nfs_compare_mount_options(s, server, flags);
54ceac45
DH		 1486 nfs_free_server(server);
1487 server = NULL;
275a5d24
TM		 1488 if (error < 0)
1489 goto error_splat_super;
f7b422b1 1490 }
24c8dbbb 1491
54ceac45
DH		 1492 if (!s->s_root) {
1493 /* initial superblock/root creation */
1494 s->s_flags = flags;
1495 nfs_clone_super(s, data->sb);
1496 }
f7b422b1 1497
54ceac45
DH		 1498 mntroot = nfs_get_root(s, data->fh);
1499 if (IS_ERR(mntroot)) {
1500 error = PTR_ERR(mntroot);
1501 goto error_splat_super;
f7b422b1
DH		 1502 }
1503
54ceac45
DH		 1504 s->s_flags |= MS_ACTIVE;
1505 mnt->mnt_sb = s;
1506 mnt->mnt_root = mntroot;
f7b422b1 1507
54ceac45
DH		 1508 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1509 return 0;
24c8dbbb 1510
54ceac45
DH		 1511out_err_nosb:
1512 nfs_free_server(server);
1513out_err_noserver:
1514 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1515 return error;
f7b422b1 1516
54ceac45
DH		 1517error_splat_super:
1518 up_write(&s->s_umount);
1519 deactivate_super(s);
1520 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1521 return error;
f7b422b1
DH		 1522}
1523
54ceac45
DH		 1524#ifdef CONFIG_NFS_V4
1525
f7b422b1 1526/*
54ceac45 1527 * Finish setting up a cloned NFS4 superblock
f7b422b1 1528 */
54ceac45
DH		 1529static void nfs4_clone_super(struct super_block *sb,
1530 const struct super_block *old_sb)
f7b422b1 1531{
54ceac45
DH		 1532 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1533 sb->s_blocksize = old_sb->s_blocksize;
1534 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1535 sb->s_time_gran = 1;
54ceac45
DH		 1536 sb->s_op = old_sb->s_op;
1537 nfs_initialise_sb(sb);
f7b422b1
DH		 1538}
1539
54ceac45
DH		 1540/*
1541 * Set up an NFS4 superblock
1542 */
1543static void nfs4_fill_super(struct super_block *sb)
f7b422b1 1544{
54ceac45
DH		 1545 sb->s_time_gran = 1;
1546 sb->s_op = &nfs4_sops;
1547 nfs_initialise_sb(sb);
f7b422b1
DH		 1548}
1549
f0768ebd
CL		 1550/*
1551 * Validate NFSv4 mount options
1552 */
1553static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
1554 const char *dev_name,
1555 struct sockaddr_in *addr,
1556 rpc_authflavor_t *authflavour,
1557 char **hostname,
1558 char **mntpath,
1559 char **ip_addr)
1560{
1561 struct nfs4_mount_data *data = *options;
1562 char *c;
1563
1564 if (data == NULL)
1565 goto out_no_data;
1566
1567 switch (data->version) {
1568 case 1:
1569 if (data->host_addrlen != sizeof(*addr))
1570 goto out_no_address;
1571 if (copy_from_user(addr, data->host_addr, sizeof(*addr)))
1572 return -EFAULT;
1573 if (addr->sin_port == 0)
1574 addr->sin_port = htons(NFS_PORT);
1575 if (!nfs_verify_server_address((struct sockaddr *) addr))
1576 goto out_no_address;
1577
1578 switch (data->auth_flavourlen) {
1579 case 0:
1580 *authflavour = RPC_AUTH_UNIX;
1581 break;
1582 case 1:
1583 if (copy_from_user(authflavour, data->auth_flavours,
1584 sizeof(*authflavour)))
1585 return -EFAULT;
1586 break;
1587 default:
1588 goto out_inval_auth;
1589 }
1590
1591 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1592 if (IS_ERR(c))
1593 return PTR_ERR(c);
1594 *hostname = c;
1595
1596 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1597 if (IS_ERR(c))
1598 return PTR_ERR(c);
1599 *mntpath = c;
1600 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *mntpath);
1601
1602 c = strndup_user(data->client_addr.data, 16);
1603 if (IS_ERR(c))
1604 return PTR_ERR(c);
1605 *ip_addr = c;
1606
1607 break;
80071225
CL		 1608 default: {
1609 unsigned int len;
1610 struct nfs_parsed_mount_data args = {
1611 .rsize = NFS_MAX_FILE_IO_SIZE,
1612 .wsize = NFS_MAX_FILE_IO_SIZE,
1613 .timeo = 600,
1614 .retrans = 2,
1615 .acregmin = 3,
1616 .acregmax = 60,
1617 .acdirmin = 30,
1618 .acdirmax = 60,
1619 .nfs_server.protocol = IPPROTO_TCP,
1620 };
1621
1622 if (nfs_parse_mount_options((char *) *options, &args) == 0)
1623 return -EINVAL;
1624
1625 if (!nfs_verify_server_address((struct sockaddr *)
1626 &args.nfs_server.address))
1627 return -EINVAL;
1628 *addr = args.nfs_server.address;
1629
1630 switch (args.auth_flavor_len) {
1631 case 0:
1632 *authflavour = RPC_AUTH_UNIX;
1633 break;
1634 case 1:
1635 *authflavour = (rpc_authflavor_t) args.auth_flavors[0];
1636 break;
1637 default:
1638 goto out_inval_auth;
1639 }
1640
1641 /*
1642 * Translate to nfs4_mount_data, which nfs4_fill_super
1643 * can deal with.
1644 */
1645 data = kzalloc(sizeof(*data), GFP_KERNEL);
1646 if (data == NULL)
1647 return -ENOMEM;
1648 *options = data;
1649
1650 data->version = 1;
1651 data->flags = args.flags & NFS4_MOUNT_FLAGMASK;
1652 data->rsize = args.rsize;
1653 data->wsize = args.wsize;
1654 data->timeo = args.timeo;
1655 data->retrans = args.retrans;
1656 data->acregmin = args.acregmin;
1657 data->acregmax = args.acregmax;
1658 data->acdirmin = args.acdirmin;
1659 data->acdirmax = args.acdirmax;
1660 data->proto = args.nfs_server.protocol;
1661
1662 /*
1663 * Split "dev_name" into "hostname:mntpath".
1664 */
1665 c = strchr(dev_name, ':');
1666 if (c == NULL)
1667 return -EINVAL;
1668 /* while calculating len, pretend ':' is '\0' */
1669 len = c - dev_name;
1670 if (len > NFS4_MAXNAMLEN)
1671 return -EINVAL;
1672 *hostname = kzalloc(len, GFP_KERNEL);
1673 if (*hostname == NULL)
1674 return -ENOMEM;
1675 strncpy(*hostname, dev_name, len - 1);
1676
1677 c++; /* step over the ':' */
1678 len = strlen(c);
1679 if (len > NFS4_MAXPATHLEN)
1680 return -EINVAL;
1681 *mntpath = kzalloc(len + 1, GFP_KERNEL);
1682 if (*mntpath == NULL)
1683 return -ENOMEM;
1684 strncpy(*mntpath, c, len);
1685
1686 dprintk("MNTPATH: %s\n", *mntpath);
1687
1688 *ip_addr = args.client_address;
1689
1690 break;
1691 }
f0768ebd
CL		 1692 }
1693
1694 return 0;
1695
1696out_no_data:
1697 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1698 return -EINVAL;
1699
1700out_inval_auth:
1701 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1702 data->auth_flavourlen);
1703 return -EINVAL;
1704
1705out_no_address:
1706 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1707 return -EINVAL;
f0768ebd
CL		 1708}
1709
54ceac45
DH		 1710/*
1711 * Get the superblock for an NFS4 mountpoint
1712 */
816724e6
TM		 1713static int nfs4_get_sb(struct file_system_type *fs_type,
1714 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 1715{
f7b422b1 1716 struct nfs4_mount_data *data = raw_data;
54ceac45
DH		 1717 struct super_block *s;
1718 struct nfs_server *server;
1719 struct sockaddr_in addr;
1720 rpc_authflavor_t authflavour;
1721 struct nfs_fh mntfh;
1722 struct dentry *mntroot;
f0768ebd 1723 char *mntpath = NULL, *hostname = NULL, *ip_addr = NULL;
75180df2 1724 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
54ceac45 1725 int error;
f7b422b1 1726
f0768ebd
CL		 1727 /* Validate the mount data */
1728 error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour,
1729 &hostname, &mntpath, &ip_addr);
1730 if (error < 0)
1731 goto out;
f7b422b1 1732
54ceac45
DH		 1733 /* Get a volume representation */
1734 server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr,
1735 authflavour, &mntfh);
1736 if (IS_ERR(server)) {
1737 error = PTR_ERR(server);
29eb981a 1738 goto out;
f7b422b1
DH		 1739 }
1740
75180df2
TM		 1741 if (server->flags & NFS4_MOUNT_UNSHARED)
1742 compare_super = NULL;
1743
54ceac45 1744 /* Get a superblock - note that we may end up sharing one that already exists */
75180df2 1745 s = sget(fs_type, compare_super, nfs_set_super, server);
816724e6
TM		 1746 if (IS_ERR(s)) {
1747 error = PTR_ERR(s);
f7b422b1 1748 goto out_free;
816724e6
TM		 1749 }
1750
5dd3177a
TM		 1751 if (s->s_fs_info != server) {
1752 nfs_free_server(server);
1753 server = NULL;
1754 }
1755
54ceac45
DH		 1756 if (!s->s_root) {
1757 /* initial superblock/root creation */
1758 s->s_flags = flags;
54ceac45 1759 nfs4_fill_super(s);
54ceac45 1760 }
f7b422b1 1761
54ceac45
DH		 1762 mntroot = nfs4_get_root(s, &mntfh);
1763 if (IS_ERR(mntroot)) {
1764 error = PTR_ERR(mntroot);
1765 goto error_splat_super;
f7b422b1 1766 }
54ceac45 1767
f7b422b1 1768 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 1769 mnt->mnt_sb = s;
1770 mnt->mnt_root = mntroot;
29eb981a
CL		 1771 error = 0;
1772
1773out:
1774 kfree(ip_addr);
54ceac45
DH		 1775 kfree(mntpath);
1776 kfree(hostname);
29eb981a 1777 return error;
54ceac45 1778
f7b422b1 1779out_free:
54ceac45 1780 nfs_free_server(server);
29eb981a 1781 goto out;
54ceac45
DH		 1782
1783error_splat_super:
1784 up_write(&s->s_umount);
1785 deactivate_super(s);
29eb981a 1786 goto out;
f7b422b1
DH		 1787}
1788
1789static void nfs4_kill_super(struct super_block *sb)
1790{
1791 struct nfs_server *server = NFS_SB(sb);
1792
1793 nfs_return_all_delegations(sb);
1794 kill_anon_super(sb);
1795
1796 nfs4_renewd_prepare_shutdown(server);
54ceac45 1797 nfs_free_server(server);
f7b422b1
DH		 1798}
1799
1800/*
54ceac45 1801 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 1802 */
54ceac45
DH		 1803static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1804 const char *dev_name, void *raw_data,
1805 struct vfsmount *mnt)
f7b422b1 1806{
54ceac45
DH		 1807 struct nfs_clone_mount *data = raw_data;
1808 struct super_block *s;
1809 struct nfs_server *server;
1810 struct dentry *mntroot;
75180df2 1811 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
54ceac45 1812 int error;
f7b422b1 1813
54ceac45 1814 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 1815
54ceac45
DH		 1816 /* create a new volume representation */
1817 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1818 if (IS_ERR(server)) {
1819 error = PTR_ERR(server);
1820 goto out_err_noserver;
f7b422b1 1821 }
f7b422b1 1822
75180df2
TM		 1823 if (server->flags & NFS4_MOUNT_UNSHARED)
1824 compare_super = NULL;
1825
54ceac45 1826 /* Get a superblock - note that we may end up sharing one that already exists */
75180df2 1827 s = sget(&nfs_fs_type, compare_super, nfs_set_super, server);
54ceac45
DH		 1828 if (IS_ERR(s)) {
1829 error = PTR_ERR(s);
1830 goto out_err_nosb;
f7b422b1 1831 }
f7b422b1 1832
54ceac45
DH		 1833 if (s->s_fs_info != server) {
1834 nfs_free_server(server);
1835 server = NULL;
1836 }
f7b422b1 1837
54ceac45
DH		 1838 if (!s->s_root) {
1839 /* initial superblock/root creation */
1840 s->s_flags = flags;
1841 nfs4_clone_super(s, data->sb);
1842 }
f7b422b1 1843
54ceac45
DH		 1844 mntroot = nfs4_get_root(s, data->fh);
1845 if (IS_ERR(mntroot)) {
1846 error = PTR_ERR(mntroot);
1847 goto error_splat_super;
1848 }
f7b422b1 1849
54ceac45
DH		 1850 s->s_flags |= MS_ACTIVE;
1851 mnt->mnt_sb = s;
1852 mnt->mnt_root = mntroot;
1853
1854 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1855 return 0;
1856
1857out_err_nosb:
1858 nfs_free_server(server);
1859out_err_noserver:
1860 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
1861 return error;
1862
1863error_splat_super:
1864 up_write(&s->s_umount);
1865 deactivate_super(s);
1866 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
1867 return error;
f7b422b1
DH		 1868}
1869
54ceac45
DH		 1870/*
1871 * Create an NFS4 server record on referral traversal
1872 */
1873static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
1874 const char *dev_name, void *raw_data,
1875 struct vfsmount *mnt)
f7b422b1
DH		 1876{
1877 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 1878 struct super_block *s;
1879 struct nfs_server *server;
1880 struct dentry *mntroot;
1881 struct nfs_fh mntfh;
75180df2 1882 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
54ceac45
DH		 1883 int error;
1884
1885 dprintk("--> nfs4_referral_get_sb()\n");
1886
1887 /* create a new volume representation */
1888 server = nfs4_create_referral_server(data, &mntfh);
1889 if (IS_ERR(server)) {
1890 error = PTR_ERR(server);
1891 goto out_err_noserver;
1892 }
1893
75180df2
TM		 1894 if (server->flags & NFS4_MOUNT_UNSHARED)
1895 compare_super = NULL;
1896
54ceac45 1897 /* Get a superblock - note that we may end up sharing one that already exists */
75180df2 1898 s = sget(&nfs_fs_type, compare_super, nfs_set_super, server);
54ceac45
DH		 1899 if (IS_ERR(s)) {
1900 error = PTR_ERR(s);
1901 goto out_err_nosb;
1902 }
1903
1904 if (s->s_fs_info != server) {
1905 nfs_free_server(server);
1906 server = NULL;
1907 }
1908
1909 if (!s->s_root) {
1910 /* initial superblock/root creation */
1911 s->s_flags = flags;
1912 nfs4_fill_super(s);
1913 }
1914
f2d0d85e 1915 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 1916 if (IS_ERR(mntroot)) {
1917 error = PTR_ERR(mntroot);
1918 goto error_splat_super;
1919 }
1920
1921 s->s_flags |= MS_ACTIVE;
1922 mnt->mnt_sb = s;
1923 mnt->mnt_root = mntroot;
1924
1925 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1926 return 0;
1927
1928out_err_nosb:
1929 nfs_free_server(server);
1930out_err_noserver:
1931 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
1932 return error;
1933
1934error_splat_super:
1935 up_write(&s->s_umount);
1936 deactivate_super(s);
1937 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
1938 return error;
f7b422b1
DH		 1939}
1940
54ceac45 1941#endif /* CONFIG_NFS_V4 */
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