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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / fs / nfs / super.c
blobfa517ae9207f6d04f66fcf4c0b12ef229bc5a176
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/nfs_xdr.h>
49 #include <linux/magic.h>
50 #include <linux/parser.h>
51
52 #include <asm/system.h>
53 #include <asm/uaccess.h>
54
55 #include "nfs4_fs.h"
56 #include "callback.h"
57 #include "delegation.h"
58 #include "iostat.h"
59 #include "internal.h"
60
61 #define NFSDBG_FACILITY NFSDBG_VFS
62
63 enum {
64 /* Mount options that take no arguments */
65 Opt_soft, Opt_hard,
66 Opt_intr, Opt_nointr,
67 Opt_posix, Opt_noposix,
68 Opt_cto, Opt_nocto,
69 Opt_ac, Opt_noac,
70 Opt_lock, Opt_nolock,
71 Opt_v2, Opt_v3,
72 Opt_udp, Opt_tcp, Opt_rdma,
73 Opt_acl, Opt_noacl,
74 Opt_rdirplus, Opt_nordirplus,
75 Opt_sharecache, Opt_nosharecache,
76
77 /* Mount options that take integer arguments */
78 Opt_port,
79 Opt_rsize, Opt_wsize, Opt_bsize,
80 Opt_timeo, Opt_retrans,
81 Opt_acregmin, Opt_acregmax,
82 Opt_acdirmin, Opt_acdirmax,
83 Opt_actimeo,
84 Opt_namelen,
85 Opt_mountport,
86 Opt_mountprog, Opt_mountvers,
87 Opt_nfsprog, Opt_nfsvers,
88
89 /* Mount options that take string arguments */
90 Opt_sec, Opt_proto, Opt_mountproto,
91 Opt_addr, Opt_mountaddr, Opt_clientaddr,
92
93 /* Mount options that are ignored */
94 Opt_userspace, Opt_deprecated,
95
96 Opt_err
97 };
98
99 static match_table_t nfs_mount_option_tokens = {
100 { Opt_userspace, "bg" },
101 { Opt_userspace, "fg" },
102 { Opt_soft, "soft" },
103 { Opt_hard, "hard" },
104 { Opt_intr, "intr" },
105 { Opt_nointr, "nointr" },
106 { Opt_posix, "posix" },
107 { Opt_noposix, "noposix" },
108 { Opt_cto, "cto" },
109 { Opt_nocto, "nocto" },
110 { Opt_ac, "ac" },
111 { Opt_noac, "noac" },
112 { Opt_lock, "lock" },
113 { Opt_nolock, "nolock" },
114 { Opt_v2, "v2" },
115 { Opt_v3, "v3" },
116 { Opt_udp, "udp" },
117 { Opt_tcp, "tcp" },
118 { Opt_rdma, "rdma" },
119 { Opt_acl, "acl" },
120 { Opt_noacl, "noacl" },
121 { Opt_rdirplus, "rdirplus" },
122 { Opt_nordirplus, "nordirplus" },
123 { Opt_sharecache, "sharecache" },
124 { Opt_nosharecache, "nosharecache" },
125
126 { Opt_port, "port=%u" },
127 { Opt_rsize, "rsize=%u" },
128 { Opt_wsize, "wsize=%u" },
129 { Opt_bsize, "bsize=%u" },
130 { Opt_timeo, "timeo=%u" },
131 { Opt_retrans, "retrans=%u" },
132 { Opt_acregmin, "acregmin=%u" },
133 { Opt_acregmax, "acregmax=%u" },
134 { Opt_acdirmin, "acdirmin=%u" },
135 { Opt_acdirmax, "acdirmax=%u" },
136 { Opt_actimeo, "actimeo=%u" },
137 { Opt_userspace, "retry=%u" },
138 { Opt_namelen, "namlen=%u" },
139 { Opt_mountport, "mountport=%u" },
140 { Opt_mountprog, "mountprog=%u" },
141 { Opt_mountvers, "mountvers=%u" },
142 { Opt_nfsprog, "nfsprog=%u" },
143 { Opt_nfsvers, "nfsvers=%u" },
144 { Opt_nfsvers, "vers=%u" },
145
146 { Opt_sec, "sec=%s" },
147 { Opt_proto, "proto=%s" },
148 { Opt_mountproto, "mountproto=%s" },
149 { Opt_addr, "addr=%s" },
150 { Opt_clientaddr, "clientaddr=%s" },
151 { Opt_userspace, "mounthost=%s" },
152 { Opt_mountaddr, "mountaddr=%s" },
153
154 { Opt_err, NULL }
155 };
156
157 enum {
158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
159
160 Opt_xprt_err
161 };
162
163 static match_table_t nfs_xprt_protocol_tokens = {
164 { Opt_xprt_udp, "udp" },
165 { Opt_xprt_tcp, "tcp" },
166 { Opt_xprt_rdma, "rdma" },
167
168 { Opt_xprt_err, NULL }
169 };
170
171 enum {
172 Opt_sec_none, Opt_sec_sys,
173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
176
177 Opt_sec_err
178 };
179
180 static match_table_t nfs_secflavor_tokens = {
181 { Opt_sec_none, "none" },
182 { Opt_sec_none, "null" },
183 { Opt_sec_sys, "sys" },
184
185 { Opt_sec_krb5, "krb5" },
186 { Opt_sec_krb5i, "krb5i" },
187 { Opt_sec_krb5p, "krb5p" },
188
189 { Opt_sec_lkey, "lkey" },
190 { Opt_sec_lkeyi, "lkeyi" },
191 { Opt_sec_lkeyp, "lkeyp" },
192
193 { Opt_sec_err, NULL }
194 };
195
196
197 static void nfs_umount_begin(struct vfsmount *, int);
198 static int nfs_statfs(struct dentry *, struct kstatfs *);
199 static int nfs_show_options(struct seq_file *, struct vfsmount *);
200 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
201 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
202 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
203 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
204 static void nfs_kill_super(struct super_block *);
205
206 static struct file_system_type nfs_fs_type = {
207 .owner = THIS_MODULE,
208 .name = "nfs",
209 .get_sb = nfs_get_sb,
210 .kill_sb = nfs_kill_super,
211 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
212 };
213
214 struct file_system_type nfs_xdev_fs_type = {
215 .owner = THIS_MODULE,
216 .name = "nfs",
217 .get_sb = nfs_xdev_get_sb,
218 .kill_sb = nfs_kill_super,
219 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
220 };
221
222 static const struct super_operations nfs_sops = {
223 .alloc_inode = nfs_alloc_inode,
224 .destroy_inode = nfs_destroy_inode,
225 .write_inode = nfs_write_inode,
226 .statfs = nfs_statfs,
227 .clear_inode = nfs_clear_inode,
228 .umount_begin = nfs_umount_begin,
229 .show_options = nfs_show_options,
230 .show_stats = nfs_show_stats,
231 };
232
233 #ifdef CONFIG_NFS_V4
234 static int nfs4_get_sb(struct file_system_type *fs_type,
235 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
236 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
237 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
238 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
239 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
240 static void nfs4_kill_super(struct super_block *sb);
241
242 static struct file_system_type nfs4_fs_type = {
243 .owner = THIS_MODULE,
244 .name = "nfs4",
245 .get_sb = nfs4_get_sb,
246 .kill_sb = nfs4_kill_super,
247 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
248 };
249
250 struct file_system_type nfs4_xdev_fs_type = {
251 .owner = THIS_MODULE,
252 .name = "nfs4",
253 .get_sb = nfs4_xdev_get_sb,
254 .kill_sb = nfs4_kill_super,
255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
256 };
257
258 struct file_system_type nfs4_referral_fs_type = {
259 .owner = THIS_MODULE,
260 .name = "nfs4",
261 .get_sb = nfs4_referral_get_sb,
262 .kill_sb = nfs4_kill_super,
263 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
264 };
265
266 static const struct super_operations nfs4_sops = {
267 .alloc_inode = nfs_alloc_inode,
268 .destroy_inode = nfs_destroy_inode,
269 .write_inode = nfs_write_inode,
270 .statfs = nfs_statfs,
271 .clear_inode = nfs4_clear_inode,
272 .umount_begin = nfs_umount_begin,
273 .show_options = nfs_show_options,
274 .show_stats = nfs_show_stats,
275 };
276 #endif
277
278 static struct shrinker acl_shrinker = {
279 .shrink = nfs_access_cache_shrinker,
280 .seeks = DEFAULT_SEEKS,
281 };
282
283 /*
284 * Register the NFS filesystems
285 */
286 int __init register_nfs_fs(void)
287 {
288 int ret;
289
290 ret = register_filesystem(&nfs_fs_type);
291 if (ret < 0)
292 goto error_0;
293
294 ret = nfs_register_sysctl();
295 if (ret < 0)
296 goto error_1;
297 #ifdef CONFIG_NFS_V4
298 ret = register_filesystem(&nfs4_fs_type);
299 if (ret < 0)
300 goto error_2;
301 #endif
302 register_shrinker(&acl_shrinker);
303 return 0;
304
305 #ifdef CONFIG_NFS_V4
306 error_2:
307 nfs_unregister_sysctl();
308 #endif
309 error_1:
310 unregister_filesystem(&nfs_fs_type);
311 error_0:
312 return ret;
313 }
314
315 /*
316 * Unregister the NFS filesystems
317 */
318 void __exit unregister_nfs_fs(void)
319 {
320 unregister_shrinker(&acl_shrinker);
321 #ifdef CONFIG_NFS_V4
322 unregister_filesystem(&nfs4_fs_type);
323 #endif
324 nfs_unregister_sysctl();
325 unregister_filesystem(&nfs_fs_type);
326 }
327
328 /*
329 * Deliver file system statistics to userspace
330 */
331 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
332 {
333 struct nfs_server *server = NFS_SB(dentry->d_sb);
334 unsigned char blockbits;
335 unsigned long blockres;
336 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
337 struct nfs_fattr fattr;
338 struct nfs_fsstat res = {
339 .fattr = &fattr,
340 };
341 int error;
342
343 lock_kernel();
344
345 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
346 if (error < 0)
347 goto out_err;
348 buf->f_type = NFS_SUPER_MAGIC;
349
350 /*
351 * Current versions of glibc do not correctly handle the
352 * case where f_frsize != f_bsize. Eventually we want to
353 * report the value of wtmult in this field.
354 */
355 buf->f_frsize = dentry->d_sb->s_blocksize;
356
357 /*
358 * On most *nix systems, f_blocks, f_bfree, and f_bavail
359 * are reported in units of f_frsize. Linux hasn't had
360 * an f_frsize field in its statfs struct until recently,
361 * thus historically Linux's sys_statfs reports these
362 * fields in units of f_bsize.
363 */
364 buf->f_bsize = dentry->d_sb->s_blocksize;
365 blockbits = dentry->d_sb->s_blocksize_bits;
366 blockres = (1 << blockbits) - 1;
367 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
368 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
369 buf->f_bavail = (res.abytes + blockres) >> blockbits;
370
371 buf->f_files = res.tfiles;
372 buf->f_ffree = res.afiles;
373
374 buf->f_namelen = server->namelen;
375
376 unlock_kernel();
377 return 0;
378
379 out_err:
380 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
381 unlock_kernel();
382 return error;
383 }
384
385 /*
386 * Map the security flavour number to a name
387 */
388 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
389 {
390 static const struct {
391 rpc_authflavor_t flavour;
392 const char *str;
393 } sec_flavours[] = {
394 { RPC_AUTH_NULL, "null" },
395 { RPC_AUTH_UNIX, "sys" },
396 { RPC_AUTH_GSS_KRB5, "krb5" },
397 { RPC_AUTH_GSS_KRB5I, "krb5i" },
398 { RPC_AUTH_GSS_KRB5P, "krb5p" },
399 { RPC_AUTH_GSS_LKEY, "lkey" },
400 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
401 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
402 { RPC_AUTH_GSS_SPKM, "spkm" },
403 { RPC_AUTH_GSS_SPKMI, "spkmi" },
404 { RPC_AUTH_GSS_SPKMP, "spkmp" },
405 { UINT_MAX, "unknown" }
406 };
407 int i;
408
409 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
410 if (sec_flavours[i].flavour == flavour)
411 break;
412 }
413 return sec_flavours[i].str;
414 }
415
416 /*
417 * Describe the mount options in force on this server representation
418 */
419 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
420 {
421 static const struct proc_nfs_info {
422 int flag;
423 const char *str;
424 const char *nostr;
425 } nfs_info[] = {
426 { NFS_MOUNT_SOFT, ",soft", ",hard" },
427 { NFS_MOUNT_INTR, ",intr", ",nointr" },
428 { NFS_MOUNT_NOCTO, ",nocto", "" },
429 { NFS_MOUNT_NOAC, ",noac", "" },
430 { NFS_MOUNT_NONLM, ",nolock", "" },
431 { NFS_MOUNT_NOACL, ",noacl", "" },
432 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
433 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
434 { 0, NULL, NULL }
435 };
436 const struct proc_nfs_info *nfs_infop;
437 struct nfs_client *clp = nfss->nfs_client;
438
439 seq_printf(m, ",vers=%d", clp->rpc_ops->version);
440 seq_printf(m, ",rsize=%d", nfss->rsize);
441 seq_printf(m, ",wsize=%d", nfss->wsize);
442 if (nfss->acregmin != 3*HZ || showdefaults)
443 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
444 if (nfss->acregmax != 60*HZ || showdefaults)
445 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
446 if (nfss->acdirmin != 30*HZ || showdefaults)
447 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
448 if (nfss->acdirmax != 60*HZ || showdefaults)
449 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
450 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
451 if (nfss->flags & nfs_infop->flag)
452 seq_puts(m, nfs_infop->str);
453 else
454 seq_puts(m, nfs_infop->nostr);
455 }
456 seq_printf(m, ",proto=%s",
457 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
458 seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
459 seq_printf(m, ",retrans=%u", clp->retrans_count);
460 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
461 }
462
463 /*
464 * Describe the mount options on this VFS mountpoint
465 */
466 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
467 {
468 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
469
470 nfs_show_mount_options(m, nfss, 0);
471
472 seq_printf(m, ",addr="NIPQUAD_FMT,
473 NIPQUAD(nfss->nfs_client->cl_addr.sin_addr));
474
475 return 0;
476 }
477
478 /*
479 * Present statistical information for this VFS mountpoint
480 */
481 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
482 {
483 int i, cpu;
484 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
485 struct rpc_auth *auth = nfss->client->cl_auth;
486 struct nfs_iostats totals = { };
487
488 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
489
490 /*
491 * Display all mount option settings
492 */
493 seq_printf(m, "\n\topts:\t");
494 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
495 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
496 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
497 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
498 nfs_show_mount_options(m, nfss, 1);
499
500 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
501
502 seq_printf(m, "\n\tcaps:\t");
503 seq_printf(m, "caps=0x%x", nfss->caps);
504 seq_printf(m, ",wtmult=%d", nfss->wtmult);
505 seq_printf(m, ",dtsize=%d", nfss->dtsize);
506 seq_printf(m, ",bsize=%d", nfss->bsize);
507 seq_printf(m, ",namelen=%d", nfss->namelen);
508
509 #ifdef CONFIG_NFS_V4
510 if (nfss->nfs_client->cl_nfsversion == 4) {
511 seq_printf(m, "\n\tnfsv4:\t");
512 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
513 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
514 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
515 }
516 #endif
517
518 /*
519 * Display security flavor in effect for this mount
520 */
521 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
522 if (auth->au_flavor)
523 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
524
525 /*
526 * Display superblock I/O counters
527 */
528 for_each_possible_cpu(cpu) {
529 struct nfs_iostats *stats;
530
531 preempt_disable();
532 stats = per_cpu_ptr(nfss->io_stats, cpu);
533
534 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
535 totals.events[i] += stats->events[i];
536 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
537 totals.bytes[i] += stats->bytes[i];
538
539 preempt_enable();
540 }
541
542 seq_printf(m, "\n\tevents:\t");
543 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
544 seq_printf(m, "%lu ", totals.events[i]);
545 seq_printf(m, "\n\tbytes:\t");
546 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
547 seq_printf(m, "%Lu ", totals.bytes[i]);
548 seq_printf(m, "\n");
549
550 rpc_print_iostats(m, nfss->client);
551
552 return 0;
553 }
554
555 /*
556 * Begin unmount by attempting to remove all automounted mountpoints we added
557 * in response to xdev traversals and referrals
558 */
559 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
560 {
561 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
562 struct rpc_clnt *rpc;
563
564 shrink_submounts(vfsmnt, &nfs_automount_list);
565
566 if (!(flags & MNT_FORCE))
567 return;
568 /* -EIO all pending I/O */
569 rpc = server->client_acl;
570 if (!IS_ERR(rpc))
571 rpc_killall_tasks(rpc);
572 rpc = server->client;
573 if (!IS_ERR(rpc))
574 rpc_killall_tasks(rpc);
575 }
576
577 /*
578 * Sanity-check a server address provided by the mount command
579 */
580 static int nfs_verify_server_address(struct sockaddr *addr)
581 {
582 switch (addr->sa_family) {
583 case AF_INET: {
584 struct sockaddr_in *sa = (struct sockaddr_in *) addr;
585 if (sa->sin_addr.s_addr != INADDR_ANY)
586 return 1;
587 break;
588 }
589 }
590
591 return 0;
592 }
593
594 /*
595 * Error-check and convert a string of mount options from user space into
596 * a data structure
597 */
598 static int nfs_parse_mount_options(char *raw,
599 struct nfs_parsed_mount_data *mnt)
600 {
601 char *p, *string;
602
603 if (!raw) {
604 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
605 return 1;
606 }
607 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
608
609 while ((p = strsep(&raw, ",")) != NULL) {
610 substring_t args[MAX_OPT_ARGS];
611 int option, token;
612
613 if (!*p)
614 continue;
615
616 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
617
618 token = match_token(p, nfs_mount_option_tokens, args);
619 switch (token) {
620 case Opt_soft:
621 mnt->flags |= NFS_MOUNT_SOFT;
622 break;
623 case Opt_hard:
624 mnt->flags &= ~NFS_MOUNT_SOFT;
625 break;
626 case Opt_intr:
627 mnt->flags |= NFS_MOUNT_INTR;
628 break;
629 case Opt_nointr:
630 mnt->flags &= ~NFS_MOUNT_INTR;
631 break;
632 case Opt_posix:
633 mnt->flags |= NFS_MOUNT_POSIX;
634 break;
635 case Opt_noposix:
636 mnt->flags &= ~NFS_MOUNT_POSIX;
637 break;
638 case Opt_cto:
639 mnt->flags &= ~NFS_MOUNT_NOCTO;
640 break;
641 case Opt_nocto:
642 mnt->flags |= NFS_MOUNT_NOCTO;
643 break;
644 case Opt_ac:
645 mnt->flags &= ~NFS_MOUNT_NOAC;
646 break;
647 case Opt_noac:
648 mnt->flags |= NFS_MOUNT_NOAC;
649 break;
650 case Opt_lock:
651 mnt->flags &= ~NFS_MOUNT_NONLM;
652 break;
653 case Opt_nolock:
654 mnt->flags |= NFS_MOUNT_NONLM;
655 break;
656 case Opt_v2:
657 mnt->flags &= ~NFS_MOUNT_VER3;
658 break;
659 case Opt_v3:
660 mnt->flags |= NFS_MOUNT_VER3;
661 break;
662 case Opt_udp:
663 mnt->flags &= ~NFS_MOUNT_TCP;
664 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
665 mnt->timeo = 7;
666 mnt->retrans = 5;
667 break;
668 case Opt_tcp:
669 mnt->flags |= NFS_MOUNT_TCP;
670 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
671 mnt->timeo = 600;
672 mnt->retrans = 2;
673 break;
674 case Opt_rdma:
675 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
676 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
677 mnt->timeo = 600;
678 mnt->retrans = 2;
679 break;
680 case Opt_acl:
681 mnt->flags &= ~NFS_MOUNT_NOACL;
682 break;
683 case Opt_noacl:
684 mnt->flags |= NFS_MOUNT_NOACL;
685 break;
686 case Opt_rdirplus:
687 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
688 break;
689 case Opt_nordirplus:
690 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
691 break;
692 case Opt_sharecache:
693 mnt->flags &= ~NFS_MOUNT_UNSHARED;
694 break;
695 case Opt_nosharecache:
696 mnt->flags |= NFS_MOUNT_UNSHARED;
697 break;
698
699 case Opt_port:
700 if (match_int(args, &option))
701 return 0;
702 if (option < 0 || option > 65535)
703 return 0;
704 mnt->nfs_server.address.sin_port = htons(option);
705 break;
706 case Opt_rsize:
707 if (match_int(args, &mnt->rsize))
708 return 0;
709 break;
710 case Opt_wsize:
711 if (match_int(args, &mnt->wsize))
712 return 0;
713 break;
714 case Opt_bsize:
715 if (match_int(args, &option))
716 return 0;
717 if (option < 0)
718 return 0;
719 mnt->bsize = option;
720 break;
721 case Opt_timeo:
722 if (match_int(args, &mnt->timeo))
723 return 0;
724 break;
725 case Opt_retrans:
726 if (match_int(args, &mnt->retrans))
727 return 0;
728 break;
729 case Opt_acregmin:
730 if (match_int(args, &mnt->acregmin))
731 return 0;
732 break;
733 case Opt_acregmax:
734 if (match_int(args, &mnt->acregmax))
735 return 0;
736 break;
737 case Opt_acdirmin:
738 if (match_int(args, &mnt->acdirmin))
739 return 0;
740 break;
741 case Opt_acdirmax:
742 if (match_int(args, &mnt->acdirmax))
743 return 0;
744 break;
745 case Opt_actimeo:
746 if (match_int(args, &option))
747 return 0;
748 if (option < 0)
749 return 0;
750 mnt->acregmin =
751 mnt->acregmax =
752 mnt->acdirmin =
753 mnt->acdirmax = option;
754 break;
755 case Opt_namelen:
756 if (match_int(args, &mnt->namlen))
757 return 0;
758 break;
759 case Opt_mountport:
760 if (match_int(args, &option))
761 return 0;
762 if (option < 0 || option > 65535)
763 return 0;
764 mnt->mount_server.port = option;
765 break;
766 case Opt_mountprog:
767 if (match_int(args, &option))
768 return 0;
769 if (option < 0)
770 return 0;
771 mnt->mount_server.program = option;
772 break;
773 case Opt_mountvers:
774 if (match_int(args, &option))
775 return 0;
776 if (option < 0)
777 return 0;
778 mnt->mount_server.version = option;
779 break;
780 case Opt_nfsprog:
781 if (match_int(args, &option))
782 return 0;
783 if (option < 0)
784 return 0;
785 mnt->nfs_server.program = option;
786 break;
787 case Opt_nfsvers:
788 if (match_int(args, &option))
789 return 0;
790 switch (option) {
791 case 2:
792 mnt->flags &= ~NFS_MOUNT_VER3;
793 break;
794 case 3:
795 mnt->flags |= NFS_MOUNT_VER3;
796 break;
797 default:
798 goto out_unrec_vers;
799 }
800 break;
801
802 case Opt_sec:
803 string = match_strdup(args);
804 if (string == NULL)
805 goto out_nomem;
806 token = match_token(string, nfs_secflavor_tokens, args);
807 kfree(string);
808
809 /*
810 * The flags setting is for v2/v3. The flavor_len
811 * setting is for v4. v2/v3 also need to know the
812 * difference between NULL and UNIX.
813 */
814 switch (token) {
815 case Opt_sec_none:
816 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
817 mnt->auth_flavor_len = 0;
818 mnt->auth_flavors[0] = RPC_AUTH_NULL;
819 break;
820 case Opt_sec_sys:
821 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
822 mnt->auth_flavor_len = 0;
823 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
824 break;
825 case Opt_sec_krb5:
826 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
827 mnt->auth_flavor_len = 1;
828 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
829 break;
830 case Opt_sec_krb5i:
831 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
832 mnt->auth_flavor_len = 1;
833 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
834 break;
835 case Opt_sec_krb5p:
836 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
837 mnt->auth_flavor_len = 1;
838 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
839 break;
840 case Opt_sec_lkey:
841 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
842 mnt->auth_flavor_len = 1;
843 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
844 break;
845 case Opt_sec_lkeyi:
846 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
847 mnt->auth_flavor_len = 1;
848 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
849 break;
850 case Opt_sec_lkeyp:
851 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
852 mnt->auth_flavor_len = 1;
853 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
854 break;
855 case Opt_sec_spkm:
856 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
857 mnt->auth_flavor_len = 1;
858 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
859 break;
860 case Opt_sec_spkmi:
861 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
862 mnt->auth_flavor_len = 1;
863 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
864 break;
865 case Opt_sec_spkmp:
866 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
867 mnt->auth_flavor_len = 1;
868 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
869 break;
870 default:
871 goto out_unrec_sec;
872 }
873 break;
874 case Opt_proto:
875 string = match_strdup(args);
876 if (string == NULL)
877 goto out_nomem;
878 token = match_token(string,
879 nfs_xprt_protocol_tokens, args);
880 kfree(string);
881
882 switch (token) {
883 case Opt_xprt_udp:
884 mnt->flags &= ~NFS_MOUNT_TCP;
885 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
886 mnt->timeo = 7;
887 mnt->retrans = 5;
888 break;
889 case Opt_xprt_tcp:
890 mnt->flags |= NFS_MOUNT_TCP;
891 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
892 mnt->timeo = 600;
893 mnt->retrans = 2;
894 break;
895 case Opt_xprt_rdma:
896 /* vector side protocols to TCP */
897 mnt->flags |= NFS_MOUNT_TCP;
898 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
899 mnt->timeo = 600;
900 mnt->retrans = 2;
901 break;
902 default:
903 goto out_unrec_xprt;
904 }
905 break;
906 case Opt_mountproto:
907 string = match_strdup(args);
908 if (string == NULL)
909 goto out_nomem;
910 token = match_token(string,
911 nfs_xprt_protocol_tokens, args);
912 kfree(string);
913
914 switch (token) {
915 case Opt_xprt_udp:
916 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
917 break;
918 case Opt_xprt_tcp:
919 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
920 break;
921 case Opt_xprt_rdma: /* not used for side protocols */
922 default:
923 goto out_unrec_xprt;
924 }
925 break;
926 case Opt_addr:
927 string = match_strdup(args);
928 if (string == NULL)
929 goto out_nomem;
930 mnt->nfs_server.address.sin_family = AF_INET;
931 mnt->nfs_server.address.sin_addr.s_addr =
932 in_aton(string);
933 kfree(string);
934 break;
935 case Opt_clientaddr:
936 string = match_strdup(args);
937 if (string == NULL)
938 goto out_nomem;
939 mnt->client_address = string;
940 break;
941 case Opt_mountaddr:
942 string = match_strdup(args);
943 if (string == NULL)
944 goto out_nomem;
945 mnt->mount_server.address.sin_family = AF_INET;
946 mnt->mount_server.address.sin_addr.s_addr =
947 in_aton(string);
948 kfree(string);
949 break;
950
951 case Opt_userspace:
952 case Opt_deprecated:
953 break;
954
955 default:
956 goto out_unknown;
957 }
958 }
959
960 return 1;
961
962 out_nomem:
963 printk(KERN_INFO "NFS: not enough memory to parse option\n");
964 return 0;
965
966 out_unrec_vers:
967 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
968 return 0;
969
970 out_unrec_xprt:
971 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
972 return 0;
973
974 out_unrec_sec:
975 printk(KERN_INFO "NFS: unrecognized security flavor\n");
976 return 0;
977
978 out_unknown:
979 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
980 return 0;
981 }
982
983 /*
984 * Use the remote server's MOUNT service to request the NFS file handle
985 * corresponding to the provided path.
986 */
987 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
988 struct nfs_fh *root_fh)
989 {
990 struct sockaddr_in sin;
991 int status;
992
993 if (args->mount_server.version == 0) {
994 if (args->flags & NFS_MOUNT_VER3)
995 args->mount_server.version = NFS_MNT3_VERSION;
996 else
997 args->mount_server.version = NFS_MNT_VERSION;
998 }
999
1000 /*
1001 * Construct the mount server's address.
1002 */
1003 if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY)
1004 sin = args->mount_server.address;
1005 else
1006 sin = args->nfs_server.address;
1007 /*
1008 * autobind will be used if mount_server.port == 0
1009 */
1010 sin.sin_port = htons(args->mount_server.port);
1011
1012 /*
1013 * Now ask the mount server to map our export path
1014 * to a file handle.
1015 */
1016 status = nfs_mount((struct sockaddr *) &sin,
1017 sizeof(sin),
1018 args->nfs_server.hostname,
1019 args->nfs_server.export_path,
1020 args->mount_server.version,
1021 args->mount_server.protocol,
1022 root_fh);
1023 if (status == 0)
1024 return 0;
1025
1026 dfprintk(MOUNT, "NFS: unable to mount server " NIPQUAD_FMT
1027 ", error %d\n", NIPQUAD(sin.sin_addr.s_addr), status);
1028 return status;
1029 }
1030
1031 /*
1032 * Validate the NFS2/NFS3 mount data
1033 * - fills in the mount root filehandle
1034 *
1035 * For option strings, user space handles the following behaviors:
1036 *
1037 * + DNS: mapping server host name to IP address ("addr=" option)
1038 *
1039 * + failure mode: how to behave if a mount request can't be handled
1040 * immediately ("fg/bg" option)
1041 *
1042 * + retry: how often to retry a mount request ("retry=" option)
1043 *
1044 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1045 * mountproto=tcp after mountproto=udp, and so on
1046 *
1047 * XXX: as far as I can tell, changing the NFS program number is not
1048 * supported in the NFS client.
1049 */
1050 static int nfs_validate_mount_data(void *options,
1051 struct nfs_parsed_mount_data *args,
1052 struct nfs_fh *mntfh,
1053 const char *dev_name)
1054 {
1055 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1056
1057 if (data == NULL)
1058 goto out_no_data;
1059
1060 memset(args, 0, sizeof(*args));
1061 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1062 args->rsize = NFS_MAX_FILE_IO_SIZE;
1063 args->wsize = NFS_MAX_FILE_IO_SIZE;
1064 args->timeo = 600;
1065 args->retrans = 2;
1066 args->acregmin = 3;
1067 args->acregmax = 60;
1068 args->acdirmin = 30;
1069 args->acdirmax = 60;
1070 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1071 args->mount_server.program = NFS_MNT_PROGRAM;
1072 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1073 args->nfs_server.program = NFS_PROGRAM;
1074
1075 switch (data->version) {
1076 case 1:
1077 data->namlen = 0;
1078 case 2:
1079 data->bsize = 0;
1080 case 3:
1081 if (data->flags & NFS_MOUNT_VER3)
1082 goto out_no_v3;
1083 data->root.size = NFS2_FHSIZE;
1084 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1085 case 4:
1086 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1087 goto out_no_sec;
1088 case 5:
1089 memset(data->context, 0, sizeof(data->context));
1090 case 6:
1091 if (data->flags & NFS_MOUNT_VER3)
1092 mntfh->size = data->root.size;
1093 else
1094 mntfh->size = NFS2_FHSIZE;
1095
1096 if (mntfh->size > sizeof(mntfh->data))
1097 goto out_invalid_fh;
1098
1099 memcpy(mntfh->data, data->root.data, mntfh->size);
1100 if (mntfh->size < sizeof(mntfh->data))
1101 memset(mntfh->data + mntfh->size, 0,
1102 sizeof(mntfh->data) - mntfh->size);
1103
1104 if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
1105 goto out_no_address;
1106
1107 /*
1108 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1109 * can deal with.
1110 */
1111 args->flags = data->flags;
1112 args->rsize = data->rsize;
1113 args->wsize = data->wsize;
1114 args->flags = data->flags;
1115 args->timeo = data->timeo;
1116 args->retrans = data->retrans;
1117 args->acregmin = data->acregmin;
1118 args->acregmax = data->acregmax;
1119 args->acdirmin = data->acdirmin;
1120 args->acdirmax = data->acdirmax;
1121 args->nfs_server.address = data->addr;
1122 if (!(data->flags & NFS_MOUNT_TCP))
1123 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1124 /* N.B. caller will free nfs_server.hostname in all cases */
1125 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1126 args->namlen = data->namlen;
1127 args->bsize = data->bsize;
1128 args->auth_flavors[0] = data->pseudoflavor;
1129 break;
1130 default: {
1131 unsigned int len;
1132 char *c;
1133 int status;
1134
1135 if (nfs_parse_mount_options((char *)options, args) == 0)
1136 return -EINVAL;
1137
1138 if (!nfs_verify_server_address((struct sockaddr *)
1139 &args->nfs_server.address))
1140 goto out_no_address;
1141
1142 c = strchr(dev_name, ':');
1143 if (c == NULL)
1144 return -EINVAL;
1145 len = c - dev_name;
1146 /* N.B. caller will free nfs_server.hostname in all cases */
1147 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1148
1149 c++;
1150 if (strlen(c) > NFS_MAXPATHLEN)
1151 return -ENAMETOOLONG;
1152 args->nfs_server.export_path = c;
1153
1154 status = nfs_try_mount(args, mntfh);
1155 if (status)
1156 return status;
1157
1158 break;
1159 }
1160 }
1161
1162 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1163 args->auth_flavors[0] = RPC_AUTH_UNIX;
1164
1165 #ifndef CONFIG_NFS_V3
1166 if (args->flags & NFS_MOUNT_VER3)
1167 goto out_v3_not_compiled;
1168 #endif /* !CONFIG_NFS_V3 */
1169
1170 return 0;
1171
1172 out_no_data:
1173 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1174 return -EINVAL;
1175
1176 out_no_v3:
1177 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1178 data->version);
1179 return -EINVAL;
1180
1181 out_no_sec:
1182 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1183 return -EINVAL;
1184
1185 #ifndef CONFIG_NFS_V3
1186 out_v3_not_compiled:
1187 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1188 return -EPROTONOSUPPORT;
1189 #endif /* !CONFIG_NFS_V3 */
1190
1191 out_no_address:
1192 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1193 return -EINVAL;
1194
1195 out_invalid_fh:
1196 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1197 return -EINVAL;
1198 }
1199
1200 /*
1201 * Initialise the common bits of the superblock
1202 */
1203 static inline void nfs_initialise_sb(struct super_block *sb)
1204 {
1205 struct nfs_server *server = NFS_SB(sb);
1206
1207 sb->s_magic = NFS_SUPER_MAGIC;
1208
1209 /* We probably want something more informative here */
1210 snprintf(sb->s_id, sizeof(sb->s_id),
1211 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1212
1213 if (sb->s_blocksize == 0)
1214 sb->s_blocksize = nfs_block_bits(server->wsize,
1215 &sb->s_blocksize_bits);
1216
1217 if (server->flags & NFS_MOUNT_NOAC)
1218 sb->s_flags |= MS_SYNCHRONOUS;
1219
1220 nfs_super_set_maxbytes(sb, server->maxfilesize);
1221 }
1222
1223 /*
1224 * Finish setting up an NFS2/3 superblock
1225 */
1226 static void nfs_fill_super(struct super_block *sb,
1227 struct nfs_parsed_mount_data *data)
1228 {
1229 struct nfs_server *server = NFS_SB(sb);
1230
1231 sb->s_blocksize_bits = 0;
1232 sb->s_blocksize = 0;
1233 if (data->bsize)
1234 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1235
1236 if (server->flags & NFS_MOUNT_VER3) {
1237 /* The VFS shouldn't apply the umask to mode bits. We will do
1238 * so ourselves when necessary.
1239 */
1240 sb->s_flags |= MS_POSIXACL;
1241 sb->s_time_gran = 1;
1242 }
1243
1244 sb->s_op = &nfs_sops;
1245 nfs_initialise_sb(sb);
1246 }
1247
1248 /*
1249 * Finish setting up a cloned NFS2/3 superblock
1250 */
1251 static void nfs_clone_super(struct super_block *sb,
1252 const struct super_block *old_sb)
1253 {
1254 struct nfs_server *server = NFS_SB(sb);
1255
1256 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1257 sb->s_blocksize = old_sb->s_blocksize;
1258 sb->s_maxbytes = old_sb->s_maxbytes;
1259
1260 if (server->flags & NFS_MOUNT_VER3) {
1261 /* The VFS shouldn't apply the umask to mode bits. We will do
1262 * so ourselves when necessary.
1263 */
1264 sb->s_flags |= MS_POSIXACL;
1265 sb->s_time_gran = 1;
1266 }
1267
1268 sb->s_op = old_sb->s_op;
1269 nfs_initialise_sb(sb);
1270 }
1271
1272 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1273
1274 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1275 {
1276 const struct nfs_server *a = s->s_fs_info;
1277 const struct rpc_clnt *clnt_a = a->client;
1278 const struct rpc_clnt *clnt_b = b->client;
1279
1280 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1281 goto Ebusy;
1282 if (a->nfs_client != b->nfs_client)
1283 goto Ebusy;
1284 if (a->flags != b->flags)
1285 goto Ebusy;
1286 if (a->wsize != b->wsize)
1287 goto Ebusy;
1288 if (a->rsize != b->rsize)
1289 goto Ebusy;
1290 if (a->acregmin != b->acregmin)
1291 goto Ebusy;
1292 if (a->acregmax != b->acregmax)
1293 goto Ebusy;
1294 if (a->acdirmin != b->acdirmin)
1295 goto Ebusy;
1296 if (a->acdirmax != b->acdirmax)
1297 goto Ebusy;
1298 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1299 goto Ebusy;
1300 return 1;
1301 Ebusy:
1302 return 0;
1303 }
1304
1305 struct nfs_sb_mountdata {
1306 struct nfs_server *server;
1307 int mntflags;
1308 };
1309
1310 static int nfs_set_super(struct super_block *s, void *data)
1311 {
1312 struct nfs_sb_mountdata *sb_mntdata = data;
1313 struct nfs_server *server = sb_mntdata->server;
1314 int ret;
1315
1316 s->s_flags = sb_mntdata->mntflags;
1317 s->s_fs_info = server;
1318 ret = set_anon_super(s, server);
1319 if (ret == 0)
1320 server->s_dev = s->s_dev;
1321 return ret;
1322 }
1323
1324 static int nfs_compare_super(struct super_block *sb, void *data)
1325 {
1326 struct nfs_sb_mountdata *sb_mntdata = data;
1327 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1328 int mntflags = sb_mntdata->mntflags;
1329
1330 if (memcmp(&old->nfs_client->cl_addr,
1331 &server->nfs_client->cl_addr,
1332 sizeof(old->nfs_client->cl_addr)) != 0)
1333 return 0;
1334 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1335 if (old->flags & NFS_MOUNT_UNSHARED)
1336 return 0;
1337 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1338 return 0;
1339 return nfs_compare_mount_options(sb, server, mntflags);
1340 }
1341
1342 static int nfs_get_sb(struct file_system_type *fs_type,
1343 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1344 {
1345 struct nfs_server *server = NULL;
1346 struct super_block *s;
1347 struct nfs_fh mntfh;
1348 struct nfs_parsed_mount_data data;
1349 struct dentry *mntroot;
1350 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1351 struct nfs_sb_mountdata sb_mntdata = {
1352 .mntflags = flags,
1353 };
1354 int error;
1355
1356 /* Validate the mount data */
1357 error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1358 if (error < 0)
1359 goto out;
1360
1361 /* Get a volume representation */
1362 server = nfs_create_server(&data, &mntfh);
1363 if (IS_ERR(server)) {
1364 error = PTR_ERR(server);
1365 goto out;
1366 }
1367 sb_mntdata.server = server;
1368
1369 if (server->flags & NFS_MOUNT_UNSHARED)
1370 compare_super = NULL;
1371
1372 /* Get a superblock - note that we may end up sharing one that already exists */
1373 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1374 if (IS_ERR(s)) {
1375 error = PTR_ERR(s);
1376 goto out_err_nosb;
1377 }
1378
1379 if (s->s_fs_info != server) {
1380 nfs_free_server(server);
1381 server = NULL;
1382 }
1383
1384 if (!s->s_root) {
1385 /* initial superblock/root creation */
1386 nfs_fill_super(s, &data);
1387 }
1388
1389 mntroot = nfs_get_root(s, &mntfh);
1390 if (IS_ERR(mntroot)) {
1391 error = PTR_ERR(mntroot);
1392 goto error_splat_super;
1393 }
1394
1395 s->s_flags |= MS_ACTIVE;
1396 mnt->mnt_sb = s;
1397 mnt->mnt_root = mntroot;
1398 error = 0;
1399
1400 out:
1401 kfree(data.nfs_server.hostname);
1402 return error;
1403
1404 out_err_nosb:
1405 nfs_free_server(server);
1406 goto out;
1407
1408 error_splat_super:
1409 up_write(&s->s_umount);
1410 deactivate_super(s);
1411 goto out;
1412 }
1413
1414 /*
1415 * Destroy an NFS2/3 superblock
1416 */
1417 static void nfs_kill_super(struct super_block *s)
1418 {
1419 struct nfs_server *server = NFS_SB(s);
1420
1421 kill_anon_super(s);
1422 nfs_free_server(server);
1423 }
1424
1425 /*
1426 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1427 */
1428 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1429 const char *dev_name, void *raw_data,
1430 struct vfsmount *mnt)
1431 {
1432 struct nfs_clone_mount *data = raw_data;
1433 struct super_block *s;
1434 struct nfs_server *server;
1435 struct dentry *mntroot;
1436 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1437 struct nfs_sb_mountdata sb_mntdata = {
1438 .mntflags = flags,
1439 };
1440 int error;
1441
1442 dprintk("--> nfs_xdev_get_sb()\n");
1443
1444 /* create a new volume representation */
1445 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1446 if (IS_ERR(server)) {
1447 error = PTR_ERR(server);
1448 goto out_err_noserver;
1449 }
1450 sb_mntdata.server = server;
1451
1452 if (server->flags & NFS_MOUNT_UNSHARED)
1453 compare_super = NULL;
1454
1455 /* Get a superblock - note that we may end up sharing one that already exists */
1456 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1457 if (IS_ERR(s)) {
1458 error = PTR_ERR(s);
1459 goto out_err_nosb;
1460 }
1461
1462 if (s->s_fs_info != server) {
1463 nfs_free_server(server);
1464 server = NULL;
1465 }
1466
1467 if (!s->s_root) {
1468 /* initial superblock/root creation */
1469 nfs_clone_super(s, data->sb);
1470 }
1471
1472 mntroot = nfs_get_root(s, data->fh);
1473 if (IS_ERR(mntroot)) {
1474 error = PTR_ERR(mntroot);
1475 goto error_splat_super;
1476 }
1477
1478 s->s_flags |= MS_ACTIVE;
1479 mnt->mnt_sb = s;
1480 mnt->mnt_root = mntroot;
1481
1482 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1483 return 0;
1484
1485 out_err_nosb:
1486 nfs_free_server(server);
1487 out_err_noserver:
1488 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1489 return error;
1490
1491 error_splat_super:
1492 up_write(&s->s_umount);
1493 deactivate_super(s);
1494 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1495 return error;
1496 }
1497
1498 #ifdef CONFIG_NFS_V4
1499
1500 /*
1501 * Finish setting up a cloned NFS4 superblock
1502 */
1503 static void nfs4_clone_super(struct super_block *sb,
1504 const struct super_block *old_sb)
1505 {
1506 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1507 sb->s_blocksize = old_sb->s_blocksize;
1508 sb->s_maxbytes = old_sb->s_maxbytes;
1509 sb->s_time_gran = 1;
1510 sb->s_op = old_sb->s_op;
1511 nfs_initialise_sb(sb);
1512 }
1513
1514 /*
1515 * Set up an NFS4 superblock
1516 */
1517 static void nfs4_fill_super(struct super_block *sb)
1518 {
1519 sb->s_time_gran = 1;
1520 sb->s_op = &nfs4_sops;
1521 nfs_initialise_sb(sb);
1522 }
1523
1524 /*
1525 * Validate NFSv4 mount options
1526 */
1527 static int nfs4_validate_mount_data(void *options,
1528 struct nfs_parsed_mount_data *args,
1529 const char *dev_name)
1530 {
1531 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1532 char *c;
1533
1534 if (data == NULL)
1535 goto out_no_data;
1536
1537 memset(args, 0, sizeof(*args));
1538 args->rsize = NFS_MAX_FILE_IO_SIZE;
1539 args->wsize = NFS_MAX_FILE_IO_SIZE;
1540 args->timeo = 600;
1541 args->retrans = 2;
1542 args->acregmin = 3;
1543 args->acregmax = 60;
1544 args->acdirmin = 30;
1545 args->acdirmax = 60;
1546 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1547
1548 switch (data->version) {
1549 case 1:
1550 if (data->host_addrlen != sizeof(args->nfs_server.address))
1551 goto out_no_address;
1552 if (copy_from_user(&args->nfs_server.address,
1553 data->host_addr,
1554 sizeof(args->nfs_server.address)))
1555 return -EFAULT;
1556 if (args->nfs_server.address.sin_port == 0)
1557 args->nfs_server.address.sin_port = htons(NFS_PORT);
1558 if (!nfs_verify_server_address((struct sockaddr *)
1559 &args->nfs_server.address))
1560 goto out_no_address;
1561
1562 switch (data->auth_flavourlen) {
1563 case 0:
1564 args->auth_flavors[0] = RPC_AUTH_UNIX;
1565 break;
1566 case 1:
1567 if (copy_from_user(&args->auth_flavors[0],
1568 data->auth_flavours,
1569 sizeof(args->auth_flavors[0])))
1570 return -EFAULT;
1571 break;
1572 default:
1573 goto out_inval_auth;
1574 }
1575
1576 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1577 if (IS_ERR(c))
1578 return PTR_ERR(c);
1579 args->nfs_server.hostname = c;
1580
1581 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1582 if (IS_ERR(c))
1583 return PTR_ERR(c);
1584 args->nfs_server.export_path = c;
1585 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1586
1587 c = strndup_user(data->client_addr.data, 16);
1588 if (IS_ERR(c))
1589 return PTR_ERR(c);
1590 args->client_address = c;
1591
1592 /*
1593 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1594 * can deal with.
1595 */
1596
1597 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1598 args->rsize = data->rsize;
1599 args->wsize = data->wsize;
1600 args->timeo = data->timeo;
1601 args->retrans = data->retrans;
1602 args->acregmin = data->acregmin;
1603 args->acregmax = data->acregmax;
1604 args->acdirmin = data->acdirmin;
1605 args->acdirmax = data->acdirmax;
1606 args->nfs_server.protocol = data->proto;
1607
1608 break;
1609 default: {
1610 unsigned int len;
1611
1612 if (nfs_parse_mount_options((char *)options, args) == 0)
1613 return -EINVAL;
1614
1615 if (!nfs_verify_server_address((struct sockaddr *)
1616 &args->nfs_server.address))
1617 return -EINVAL;
1618
1619 switch (args->auth_flavor_len) {
1620 case 0:
1621 args->auth_flavors[0] = RPC_AUTH_UNIX;
1622 break;
1623 case 1:
1624 break;
1625 default:
1626 goto out_inval_auth;
1627 }
1628
1629 /*
1630 * Split "dev_name" into "hostname:mntpath".
1631 */
1632 c = strchr(dev_name, ':');
1633 if (c == NULL)
1634 return -EINVAL;
1635 /* while calculating len, pretend ':' is '\0' */
1636 len = c - dev_name;
1637 if (len > NFS4_MAXNAMLEN)
1638 return -ENAMETOOLONG;
1639 args->nfs_server.hostname = kzalloc(len, GFP_KERNEL);
1640 if (args->nfs_server.hostname == NULL)
1641 return -ENOMEM;
1642 strncpy(args->nfs_server.hostname, dev_name, len - 1);
1643
1644 c++; /* step over the ':' */
1645 len = strlen(c);
1646 if (len > NFS4_MAXPATHLEN)
1647 return -ENAMETOOLONG;
1648 args->nfs_server.export_path = kzalloc(len + 1, GFP_KERNEL);
1649 if (args->nfs_server.export_path == NULL)
1650 return -ENOMEM;
1651 strncpy(args->nfs_server.export_path, c, len);
1652
1653 dprintk("MNTPATH: %s\n", args->nfs_server.export_path);
1654
1655 if (args->client_address == NULL)
1656 goto out_no_client_address;
1657
1658 break;
1659 }
1660 }
1661
1662 return 0;
1663
1664 out_no_data:
1665 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1666 return -EINVAL;
1667
1668 out_inval_auth:
1669 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1670 data->auth_flavourlen);
1671 return -EINVAL;
1672
1673 out_no_address:
1674 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1675 return -EINVAL;
1676
1677 out_no_client_address:
1678 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1679 return -EINVAL;
1680 }
1681
1682 /*
1683 * Get the superblock for an NFS4 mountpoint
1684 */
1685 static int nfs4_get_sb(struct file_system_type *fs_type,
1686 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1687 {
1688 struct nfs_parsed_mount_data data;
1689 struct super_block *s;
1690 struct nfs_server *server;
1691 struct nfs_fh mntfh;
1692 struct dentry *mntroot;
1693 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1694 struct nfs_sb_mountdata sb_mntdata = {
1695 .mntflags = flags,
1696 };
1697 int error;
1698
1699 /* Validate the mount data */
1700 error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1701 if (error < 0)
1702 goto out;
1703
1704 /* Get a volume representation */
1705 server = nfs4_create_server(&data, &mntfh);
1706 if (IS_ERR(server)) {
1707 error = PTR_ERR(server);
1708 goto out;
1709 }
1710 sb_mntdata.server = server;
1711
1712 if (server->flags & NFS4_MOUNT_UNSHARED)
1713 compare_super = NULL;
1714
1715 /* Get a superblock - note that we may end up sharing one that already exists */
1716 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1717 if (IS_ERR(s)) {
1718 error = PTR_ERR(s);
1719 goto out_free;
1720 }
1721
1722 if (s->s_fs_info != server) {
1723 nfs_free_server(server);
1724 server = NULL;
1725 }
1726
1727 if (!s->s_root) {
1728 /* initial superblock/root creation */
1729 nfs4_fill_super(s);
1730 }
1731
1732 mntroot = nfs4_get_root(s, &mntfh);
1733 if (IS_ERR(mntroot)) {
1734 error = PTR_ERR(mntroot);
1735 goto error_splat_super;
1736 }
1737
1738 s->s_flags |= MS_ACTIVE;
1739 mnt->mnt_sb = s;
1740 mnt->mnt_root = mntroot;
1741 error = 0;
1742
1743 out:
1744 kfree(data.client_address);
1745 kfree(data.nfs_server.export_path);
1746 kfree(data.nfs_server.hostname);
1747 return error;
1748
1749 out_free:
1750 nfs_free_server(server);
1751 goto out;
1752
1753 error_splat_super:
1754 up_write(&s->s_umount);
1755 deactivate_super(s);
1756 goto out;
1757 }
1758
1759 static void nfs4_kill_super(struct super_block *sb)
1760 {
1761 struct nfs_server *server = NFS_SB(sb);
1762
1763 nfs_return_all_delegations(sb);
1764 kill_anon_super(sb);
1765
1766 nfs4_renewd_prepare_shutdown(server);
1767 nfs_free_server(server);
1768 }
1769
1770 /*
1771 * Clone an NFS4 server record on xdev traversal (FSID-change)
1772 */
1773 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1774 const char *dev_name, void *raw_data,
1775 struct vfsmount *mnt)
1776 {
1777 struct nfs_clone_mount *data = raw_data;
1778 struct super_block *s;
1779 struct nfs_server *server;
1780 struct dentry *mntroot;
1781 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1782 struct nfs_sb_mountdata sb_mntdata = {
1783 .mntflags = flags,
1784 };
1785 int error;
1786
1787 dprintk("--> nfs4_xdev_get_sb()\n");
1788
1789 /* create a new volume representation */
1790 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1791 if (IS_ERR(server)) {
1792 error = PTR_ERR(server);
1793 goto out_err_noserver;
1794 }
1795 sb_mntdata.server = server;
1796
1797 if (server->flags & NFS4_MOUNT_UNSHARED)
1798 compare_super = NULL;
1799
1800 /* Get a superblock - note that we may end up sharing one that already exists */
1801 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1802 if (IS_ERR(s)) {
1803 error = PTR_ERR(s);
1804 goto out_err_nosb;
1805 }
1806
1807 if (s->s_fs_info != server) {
1808 nfs_free_server(server);
1809 server = NULL;
1810 }
1811
1812 if (!s->s_root) {
1813 /* initial superblock/root creation */
1814 nfs4_clone_super(s, data->sb);
1815 }
1816
1817 mntroot = nfs4_get_root(s, data->fh);
1818 if (IS_ERR(mntroot)) {
1819 error = PTR_ERR(mntroot);
1820 goto error_splat_super;
1821 }
1822
1823 s->s_flags |= MS_ACTIVE;
1824 mnt->mnt_sb = s;
1825 mnt->mnt_root = mntroot;
1826
1827 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1828 return 0;
1829
1830 out_err_nosb:
1831 nfs_free_server(server);
1832 out_err_noserver:
1833 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
1834 return error;
1835
1836 error_splat_super:
1837 up_write(&s->s_umount);
1838 deactivate_super(s);
1839 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
1840 return error;
1841 }
1842
1843 /*
1844 * Create an NFS4 server record on referral traversal
1845 */
1846 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
1847 const char *dev_name, void *raw_data,
1848 struct vfsmount *mnt)
1849 {
1850 struct nfs_clone_mount *data = raw_data;
1851 struct super_block *s;
1852 struct nfs_server *server;
1853 struct dentry *mntroot;
1854 struct nfs_fh mntfh;
1855 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1856 struct nfs_sb_mountdata sb_mntdata = {
1857 .mntflags = flags,
1858 };
1859 int error;
1860
1861 dprintk("--> nfs4_referral_get_sb()\n");
1862
1863 /* create a new volume representation */
1864 server = nfs4_create_referral_server(data, &mntfh);
1865 if (IS_ERR(server)) {
1866 error = PTR_ERR(server);
1867 goto out_err_noserver;
1868 }
1869 sb_mntdata.server = server;
1870
1871 if (server->flags & NFS4_MOUNT_UNSHARED)
1872 compare_super = NULL;
1873
1874 /* Get a superblock - note that we may end up sharing one that already exists */
1875 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1876 if (IS_ERR(s)) {
1877 error = PTR_ERR(s);
1878 goto out_err_nosb;
1879 }
1880
1881 if (s->s_fs_info != server) {
1882 nfs_free_server(server);
1883 server = NULL;
1884 }
1885
1886 if (!s->s_root) {
1887 /* initial superblock/root creation */
1888 nfs4_fill_super(s);
1889 }
1890
1891 mntroot = nfs4_get_root(s, &mntfh);
1892 if (IS_ERR(mntroot)) {
1893 error = PTR_ERR(mntroot);
1894 goto error_splat_super;
1895 }
1896
1897 s->s_flags |= MS_ACTIVE;
1898 mnt->mnt_sb = s;
1899 mnt->mnt_root = mntroot;
1900
1901 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1902 return 0;
1903
1904 out_err_nosb:
1905 nfs_free_server(server);
1906 out_err_noserver:
1907 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
1908 return error;
1909
1910 error_splat_super:
1911 up_write(&s->s_umount);
1912 deactivate_super(s);
1913 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
1914 return error;
1915 }
1916
1917 #endif /* CONFIG_NFS_V4 */
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