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NFS: Remove the redundant nfs_client->cl_nfsversion
[deliverable/linux.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/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_mountvers,
87 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_mountvers, "mountvers=%u" },
141 { Opt_nfsvers, "nfsvers=%u" },
142 { Opt_nfsvers, "vers=%u" },
143
144 { Opt_sec, "sec=%s" },
145 { Opt_proto, "proto=%s" },
146 { Opt_mountproto, "mountproto=%s" },
147 { Opt_addr, "addr=%s" },
148 { Opt_clientaddr, "clientaddr=%s" },
149 { Opt_userspace, "mounthost=%s" },
150 { Opt_mountaddr, "mountaddr=%s" },
151
152 { Opt_err, NULL }
153 };
154
155 enum {
156 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
157
158 Opt_xprt_err
159 };
160
161 static match_table_t nfs_xprt_protocol_tokens = {
162 { Opt_xprt_udp, "udp" },
163 { Opt_xprt_tcp, "tcp" },
164 { Opt_xprt_rdma, "rdma" },
165
166 { Opt_xprt_err, NULL }
167 };
168
169 enum {
170 Opt_sec_none, Opt_sec_sys,
171 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
172 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
173 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
174
175 Opt_sec_err
176 };
177
178 static match_table_t nfs_secflavor_tokens = {
179 { Opt_sec_none, "none" },
180 { Opt_sec_none, "null" },
181 { Opt_sec_sys, "sys" },
182
183 { Opt_sec_krb5, "krb5" },
184 { Opt_sec_krb5i, "krb5i" },
185 { Opt_sec_krb5p, "krb5p" },
186
187 { Opt_sec_lkey, "lkey" },
188 { Opt_sec_lkeyi, "lkeyi" },
189 { Opt_sec_lkeyp, "lkeyp" },
190
191 { Opt_sec_err, NULL }
192 };
193
194
195 static void nfs_umount_begin(struct vfsmount *, int);
196 static int nfs_statfs(struct dentry *, struct kstatfs *);
197 static int nfs_show_options(struct seq_file *, struct vfsmount *);
198 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
199 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
200 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
201 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
202 static void nfs_kill_super(struct super_block *);
203 static void nfs_put_super(struct super_block *);
204
205 static struct file_system_type nfs_fs_type = {
206 .owner = THIS_MODULE,
207 .name = "nfs",
208 .get_sb = nfs_get_sb,
209 .kill_sb = nfs_kill_super,
210 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
211 };
212
213 struct file_system_type nfs_xdev_fs_type = {
214 .owner = THIS_MODULE,
215 .name = "nfs",
216 .get_sb = nfs_xdev_get_sb,
217 .kill_sb = nfs_kill_super,
218 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
219 };
220
221 static const struct super_operations nfs_sops = {
222 .alloc_inode = nfs_alloc_inode,
223 .destroy_inode = nfs_destroy_inode,
224 .write_inode = nfs_write_inode,
225 .put_super = nfs_put_super,
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 void nfs_sb_active(struct nfs_server *server)
329 {
330 atomic_inc(&server->active);
331 }
332
333 void nfs_sb_deactive(struct nfs_server *server)
334 {
335 if (atomic_dec_and_test(&server->active))
336 wake_up(&server->active_wq);
337 }
338
339 static void nfs_put_super(struct super_block *sb)
340 {
341 struct nfs_server *server = NFS_SB(sb);
342 /*
343 * Make sure there are no outstanding ops to this server.
344 * If so, wait for them to finish before allowing the
345 * unmount to continue.
346 */
347 wait_event(server->active_wq, atomic_read(&server->active) == 0);
348 }
349
350 /*
351 * Deliver file system statistics to userspace
352 */
353 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
354 {
355 struct nfs_server *server = NFS_SB(dentry->d_sb);
356 unsigned char blockbits;
357 unsigned long blockres;
358 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
359 struct nfs_fattr fattr;
360 struct nfs_fsstat res = {
361 .fattr = &fattr,
362 };
363 int error;
364
365 lock_kernel();
366
367 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
368 if (error < 0)
369 goto out_err;
370 buf->f_type = NFS_SUPER_MAGIC;
371
372 /*
373 * Current versions of glibc do not correctly handle the
374 * case where f_frsize != f_bsize. Eventually we want to
375 * report the value of wtmult in this field.
376 */
377 buf->f_frsize = dentry->d_sb->s_blocksize;
378
379 /*
380 * On most *nix systems, f_blocks, f_bfree, and f_bavail
381 * are reported in units of f_frsize. Linux hasn't had
382 * an f_frsize field in its statfs struct until recently,
383 * thus historically Linux's sys_statfs reports these
384 * fields in units of f_bsize.
385 */
386 buf->f_bsize = dentry->d_sb->s_blocksize;
387 blockbits = dentry->d_sb->s_blocksize_bits;
388 blockres = (1 << blockbits) - 1;
389 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
390 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
391 buf->f_bavail = (res.abytes + blockres) >> blockbits;
392
393 buf->f_files = res.tfiles;
394 buf->f_ffree = res.afiles;
395
396 buf->f_namelen = server->namelen;
397
398 unlock_kernel();
399 return 0;
400
401 out_err:
402 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
403 unlock_kernel();
404 return error;
405 }
406
407 /*
408 * Map the security flavour number to a name
409 */
410 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
411 {
412 static const struct {
413 rpc_authflavor_t flavour;
414 const char *str;
415 } sec_flavours[] = {
416 { RPC_AUTH_NULL, "null" },
417 { RPC_AUTH_UNIX, "sys" },
418 { RPC_AUTH_GSS_KRB5, "krb5" },
419 { RPC_AUTH_GSS_KRB5I, "krb5i" },
420 { RPC_AUTH_GSS_KRB5P, "krb5p" },
421 { RPC_AUTH_GSS_LKEY, "lkey" },
422 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
423 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
424 { RPC_AUTH_GSS_SPKM, "spkm" },
425 { RPC_AUTH_GSS_SPKMI, "spkmi" },
426 { RPC_AUTH_GSS_SPKMP, "spkmp" },
427 { UINT_MAX, "unknown" }
428 };
429 int i;
430
431 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
432 if (sec_flavours[i].flavour == flavour)
433 break;
434 }
435 return sec_flavours[i].str;
436 }
437
438 /*
439 * Describe the mount options in force on this server representation
440 */
441 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
442 {
443 static const struct proc_nfs_info {
444 int flag;
445 const char *str;
446 const char *nostr;
447 } nfs_info[] = {
448 { NFS_MOUNT_SOFT, ",soft", ",hard" },
449 { NFS_MOUNT_INTR, ",intr", ",nointr" },
450 { NFS_MOUNT_NOCTO, ",nocto", "" },
451 { NFS_MOUNT_NOAC, ",noac", "" },
452 { NFS_MOUNT_NONLM, ",nolock", "" },
453 { NFS_MOUNT_NOACL, ",noacl", "" },
454 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
455 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
456 { 0, NULL, NULL }
457 };
458 const struct proc_nfs_info *nfs_infop;
459 struct nfs_client *clp = nfss->nfs_client;
460
461 seq_printf(m, ",vers=%d", clp->rpc_ops->version);
462 seq_printf(m, ",rsize=%d", nfss->rsize);
463 seq_printf(m, ",wsize=%d", nfss->wsize);
464 if (nfss->acregmin != 3*HZ || showdefaults)
465 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
466 if (nfss->acregmax != 60*HZ || showdefaults)
467 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
468 if (nfss->acdirmin != 30*HZ || showdefaults)
469 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
470 if (nfss->acdirmax != 60*HZ || showdefaults)
471 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
472 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
473 if (nfss->flags & nfs_infop->flag)
474 seq_puts(m, nfs_infop->str);
475 else
476 seq_puts(m, nfs_infop->nostr);
477 }
478 seq_printf(m, ",proto=%s",
479 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
480 seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
481 seq_printf(m, ",retrans=%u", clp->retrans_count);
482 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
483 }
484
485 /*
486 * Describe the mount options on this VFS mountpoint
487 */
488 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
489 {
490 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
491
492 nfs_show_mount_options(m, nfss, 0);
493
494 seq_printf(m, ",addr="NIPQUAD_FMT,
495 NIPQUAD(nfss->nfs_client->cl_addr.sin_addr));
496
497 return 0;
498 }
499
500 /*
501 * Present statistical information for this VFS mountpoint
502 */
503 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
504 {
505 int i, cpu;
506 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
507 struct rpc_auth *auth = nfss->client->cl_auth;
508 struct nfs_iostats totals = { };
509
510 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
511
512 /*
513 * Display all mount option settings
514 */
515 seq_printf(m, "\n\topts:\t");
516 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
517 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
518 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
519 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
520 nfs_show_mount_options(m, nfss, 1);
521
522 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
523
524 seq_printf(m, "\n\tcaps:\t");
525 seq_printf(m, "caps=0x%x", nfss->caps);
526 seq_printf(m, ",wtmult=%d", nfss->wtmult);
527 seq_printf(m, ",dtsize=%d", nfss->dtsize);
528 seq_printf(m, ",bsize=%d", nfss->bsize);
529 seq_printf(m, ",namelen=%d", nfss->namelen);
530
531 #ifdef CONFIG_NFS_V4
532 if (nfss->nfs_client->rpc_ops->version == 4) {
533 seq_printf(m, "\n\tnfsv4:\t");
534 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
535 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
536 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
537 }
538 #endif
539
540 /*
541 * Display security flavor in effect for this mount
542 */
543 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
544 if (auth->au_flavor)
545 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
546
547 /*
548 * Display superblock I/O counters
549 */
550 for_each_possible_cpu(cpu) {
551 struct nfs_iostats *stats;
552
553 preempt_disable();
554 stats = per_cpu_ptr(nfss->io_stats, cpu);
555
556 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
557 totals.events[i] += stats->events[i];
558 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
559 totals.bytes[i] += stats->bytes[i];
560
561 preempt_enable();
562 }
563
564 seq_printf(m, "\n\tevents:\t");
565 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
566 seq_printf(m, "%lu ", totals.events[i]);
567 seq_printf(m, "\n\tbytes:\t");
568 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
569 seq_printf(m, "%Lu ", totals.bytes[i]);
570 seq_printf(m, "\n");
571
572 rpc_print_iostats(m, nfss->client);
573
574 return 0;
575 }
576
577 /*
578 * Begin unmount by attempting to remove all automounted mountpoints we added
579 * in response to xdev traversals and referrals
580 */
581 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
582 {
583 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
584 struct rpc_clnt *rpc;
585
586 shrink_submounts(vfsmnt, &nfs_automount_list);
587
588 if (!(flags & MNT_FORCE))
589 return;
590 /* -EIO all pending I/O */
591 rpc = server->client_acl;
592 if (!IS_ERR(rpc))
593 rpc_killall_tasks(rpc);
594 rpc = server->client;
595 if (!IS_ERR(rpc))
596 rpc_killall_tasks(rpc);
597 }
598
599 /*
600 * Sanity-check a server address provided by the mount command
601 */
602 static int nfs_verify_server_address(struct sockaddr *addr)
603 {
604 switch (addr->sa_family) {
605 case AF_INET: {
606 struct sockaddr_in *sa = (struct sockaddr_in *) addr;
607 if (sa->sin_addr.s_addr != INADDR_ANY)
608 return 1;
609 break;
610 }
611 }
612
613 return 0;
614 }
615
616 /*
617 * Error-check and convert a string of mount options from user space into
618 * a data structure
619 */
620 static int nfs_parse_mount_options(char *raw,
621 struct nfs_parsed_mount_data *mnt)
622 {
623 char *p, *string;
624
625 if (!raw) {
626 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
627 return 1;
628 }
629 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
630
631 while ((p = strsep(&raw, ",")) != NULL) {
632 substring_t args[MAX_OPT_ARGS];
633 int option, token;
634
635 if (!*p)
636 continue;
637
638 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
639
640 token = match_token(p, nfs_mount_option_tokens, args);
641 switch (token) {
642 case Opt_soft:
643 mnt->flags |= NFS_MOUNT_SOFT;
644 break;
645 case Opt_hard:
646 mnt->flags &= ~NFS_MOUNT_SOFT;
647 break;
648 case Opt_intr:
649 mnt->flags |= NFS_MOUNT_INTR;
650 break;
651 case Opt_nointr:
652 mnt->flags &= ~NFS_MOUNT_INTR;
653 break;
654 case Opt_posix:
655 mnt->flags |= NFS_MOUNT_POSIX;
656 break;
657 case Opt_noposix:
658 mnt->flags &= ~NFS_MOUNT_POSIX;
659 break;
660 case Opt_cto:
661 mnt->flags &= ~NFS_MOUNT_NOCTO;
662 break;
663 case Opt_nocto:
664 mnt->flags |= NFS_MOUNT_NOCTO;
665 break;
666 case Opt_ac:
667 mnt->flags &= ~NFS_MOUNT_NOAC;
668 break;
669 case Opt_noac:
670 mnt->flags |= NFS_MOUNT_NOAC;
671 break;
672 case Opt_lock:
673 mnt->flags &= ~NFS_MOUNT_NONLM;
674 break;
675 case Opt_nolock:
676 mnt->flags |= NFS_MOUNT_NONLM;
677 break;
678 case Opt_v2:
679 mnt->flags &= ~NFS_MOUNT_VER3;
680 break;
681 case Opt_v3:
682 mnt->flags |= NFS_MOUNT_VER3;
683 break;
684 case Opt_udp:
685 mnt->flags &= ~NFS_MOUNT_TCP;
686 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
687 mnt->timeo = 7;
688 mnt->retrans = 5;
689 break;
690 case Opt_tcp:
691 mnt->flags |= NFS_MOUNT_TCP;
692 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
693 mnt->timeo = 600;
694 mnt->retrans = 2;
695 break;
696 case Opt_rdma:
697 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
698 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
699 mnt->timeo = 600;
700 mnt->retrans = 2;
701 break;
702 case Opt_acl:
703 mnt->flags &= ~NFS_MOUNT_NOACL;
704 break;
705 case Opt_noacl:
706 mnt->flags |= NFS_MOUNT_NOACL;
707 break;
708 case Opt_rdirplus:
709 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
710 break;
711 case Opt_nordirplus:
712 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
713 break;
714 case Opt_sharecache:
715 mnt->flags &= ~NFS_MOUNT_UNSHARED;
716 break;
717 case Opt_nosharecache:
718 mnt->flags |= NFS_MOUNT_UNSHARED;
719 break;
720
721 case Opt_port:
722 if (match_int(args, &option))
723 return 0;
724 if (option < 0 || option > 65535)
725 return 0;
726 mnt->nfs_server.address.sin_port = htons(option);
727 break;
728 case Opt_rsize:
729 if (match_int(args, &mnt->rsize))
730 return 0;
731 break;
732 case Opt_wsize:
733 if (match_int(args, &mnt->wsize))
734 return 0;
735 break;
736 case Opt_bsize:
737 if (match_int(args, &option))
738 return 0;
739 if (option < 0)
740 return 0;
741 mnt->bsize = option;
742 break;
743 case Opt_timeo:
744 if (match_int(args, &mnt->timeo))
745 return 0;
746 break;
747 case Opt_retrans:
748 if (match_int(args, &mnt->retrans))
749 return 0;
750 break;
751 case Opt_acregmin:
752 if (match_int(args, &mnt->acregmin))
753 return 0;
754 break;
755 case Opt_acregmax:
756 if (match_int(args, &mnt->acregmax))
757 return 0;
758 break;
759 case Opt_acdirmin:
760 if (match_int(args, &mnt->acdirmin))
761 return 0;
762 break;
763 case Opt_acdirmax:
764 if (match_int(args, &mnt->acdirmax))
765 return 0;
766 break;
767 case Opt_actimeo:
768 if (match_int(args, &option))
769 return 0;
770 if (option < 0)
771 return 0;
772 mnt->acregmin =
773 mnt->acregmax =
774 mnt->acdirmin =
775 mnt->acdirmax = option;
776 break;
777 case Opt_namelen:
778 if (match_int(args, &mnt->namlen))
779 return 0;
780 break;
781 case Opt_mountport:
782 if (match_int(args, &option))
783 return 0;
784 if (option < 0 || option > 65535)
785 return 0;
786 mnt->mount_server.port = option;
787 break;
788 case Opt_mountvers:
789 if (match_int(args, &option))
790 return 0;
791 if (option < 0)
792 return 0;
793 mnt->mount_server.version = option;
794 break;
795 case Opt_nfsvers:
796 if (match_int(args, &option))
797 return 0;
798 switch (option) {
799 case 2:
800 mnt->flags &= ~NFS_MOUNT_VER3;
801 break;
802 case 3:
803 mnt->flags |= NFS_MOUNT_VER3;
804 break;
805 default:
806 goto out_unrec_vers;
807 }
808 break;
809
810 case Opt_sec:
811 string = match_strdup(args);
812 if (string == NULL)
813 goto out_nomem;
814 token = match_token(string, nfs_secflavor_tokens, args);
815 kfree(string);
816
817 /*
818 * The flags setting is for v2/v3. The flavor_len
819 * setting is for v4. v2/v3 also need to know the
820 * difference between NULL and UNIX.
821 */
822 switch (token) {
823 case Opt_sec_none:
824 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
825 mnt->auth_flavor_len = 0;
826 mnt->auth_flavors[0] = RPC_AUTH_NULL;
827 break;
828 case Opt_sec_sys:
829 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
830 mnt->auth_flavor_len = 0;
831 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
832 break;
833 case Opt_sec_krb5:
834 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
835 mnt->auth_flavor_len = 1;
836 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
837 break;
838 case Opt_sec_krb5i:
839 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
840 mnt->auth_flavor_len = 1;
841 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
842 break;
843 case Opt_sec_krb5p:
844 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
845 mnt->auth_flavor_len = 1;
846 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
847 break;
848 case Opt_sec_lkey:
849 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
850 mnt->auth_flavor_len = 1;
851 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
852 break;
853 case Opt_sec_lkeyi:
854 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
855 mnt->auth_flavor_len = 1;
856 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
857 break;
858 case Opt_sec_lkeyp:
859 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
860 mnt->auth_flavor_len = 1;
861 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
862 break;
863 case Opt_sec_spkm:
864 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
865 mnt->auth_flavor_len = 1;
866 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
867 break;
868 case Opt_sec_spkmi:
869 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
870 mnt->auth_flavor_len = 1;
871 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
872 break;
873 case Opt_sec_spkmp:
874 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
875 mnt->auth_flavor_len = 1;
876 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
877 break;
878 default:
879 goto out_unrec_sec;
880 }
881 break;
882 case Opt_proto:
883 string = match_strdup(args);
884 if (string == NULL)
885 goto out_nomem;
886 token = match_token(string,
887 nfs_xprt_protocol_tokens, args);
888 kfree(string);
889
890 switch (token) {
891 case Opt_xprt_udp:
892 mnt->flags &= ~NFS_MOUNT_TCP;
893 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
894 mnt->timeo = 7;
895 mnt->retrans = 5;
896 break;
897 case Opt_xprt_tcp:
898 mnt->flags |= NFS_MOUNT_TCP;
899 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
900 mnt->timeo = 600;
901 mnt->retrans = 2;
902 break;
903 case Opt_xprt_rdma:
904 /* vector side protocols to TCP */
905 mnt->flags |= NFS_MOUNT_TCP;
906 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
907 mnt->timeo = 600;
908 mnt->retrans = 2;
909 break;
910 default:
911 goto out_unrec_xprt;
912 }
913 break;
914 case Opt_mountproto:
915 string = match_strdup(args);
916 if (string == NULL)
917 goto out_nomem;
918 token = match_token(string,
919 nfs_xprt_protocol_tokens, args);
920 kfree(string);
921
922 switch (token) {
923 case Opt_xprt_udp:
924 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
925 break;
926 case Opt_xprt_tcp:
927 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
928 break;
929 case Opt_xprt_rdma: /* not used for side protocols */
930 default:
931 goto out_unrec_xprt;
932 }
933 break;
934 case Opt_addr:
935 string = match_strdup(args);
936 if (string == NULL)
937 goto out_nomem;
938 mnt->nfs_server.address.sin_family = AF_INET;
939 mnt->nfs_server.address.sin_addr.s_addr =
940 in_aton(string);
941 kfree(string);
942 break;
943 case Opt_clientaddr:
944 string = match_strdup(args);
945 if (string == NULL)
946 goto out_nomem;
947 mnt->client_address = string;
948 break;
949 case Opt_mountaddr:
950 string = match_strdup(args);
951 if (string == NULL)
952 goto out_nomem;
953 mnt->mount_server.address.sin_family = AF_INET;
954 mnt->mount_server.address.sin_addr.s_addr =
955 in_aton(string);
956 kfree(string);
957 break;
958
959 case Opt_userspace:
960 case Opt_deprecated:
961 break;
962
963 default:
964 goto out_unknown;
965 }
966 }
967
968 return 1;
969
970 out_nomem:
971 printk(KERN_INFO "NFS: not enough memory to parse option\n");
972 return 0;
973
974 out_unrec_vers:
975 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
976 return 0;
977
978 out_unrec_xprt:
979 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
980 return 0;
981
982 out_unrec_sec:
983 printk(KERN_INFO "NFS: unrecognized security flavor\n");
984 return 0;
985
986 out_unknown:
987 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
988 return 0;
989 }
990
991 /*
992 * Use the remote server's MOUNT service to request the NFS file handle
993 * corresponding to the provided path.
994 */
995 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
996 struct nfs_fh *root_fh)
997 {
998 struct sockaddr_in sin;
999 int status;
1000
1001 if (args->mount_server.version == 0) {
1002 if (args->flags & NFS_MOUNT_VER3)
1003 args->mount_server.version = NFS_MNT3_VERSION;
1004 else
1005 args->mount_server.version = NFS_MNT_VERSION;
1006 }
1007
1008 /*
1009 * Construct the mount server's address.
1010 */
1011 if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY)
1012 sin = args->mount_server.address;
1013 else
1014 sin = args->nfs_server.address;
1015 /*
1016 * autobind will be used if mount_server.port == 0
1017 */
1018 sin.sin_port = htons(args->mount_server.port);
1019
1020 /*
1021 * Now ask the mount server to map our export path
1022 * to a file handle.
1023 */
1024 status = nfs_mount((struct sockaddr *) &sin,
1025 sizeof(sin),
1026 args->nfs_server.hostname,
1027 args->nfs_server.export_path,
1028 args->mount_server.version,
1029 args->mount_server.protocol,
1030 root_fh);
1031 if (status == 0)
1032 return 0;
1033
1034 dfprintk(MOUNT, "NFS: unable to mount server " NIPQUAD_FMT
1035 ", error %d\n", NIPQUAD(sin.sin_addr.s_addr), status);
1036 return status;
1037 }
1038
1039 /*
1040 * Validate the NFS2/NFS3 mount data
1041 * - fills in the mount root filehandle
1042 *
1043 * For option strings, user space handles the following behaviors:
1044 *
1045 * + DNS: mapping server host name to IP address ("addr=" option)
1046 *
1047 * + failure mode: how to behave if a mount request can't be handled
1048 * immediately ("fg/bg" option)
1049 *
1050 * + retry: how often to retry a mount request ("retry=" option)
1051 *
1052 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1053 * mountproto=tcp after mountproto=udp, and so on
1054 */
1055 static int nfs_validate_mount_data(void *options,
1056 struct nfs_parsed_mount_data *args,
1057 struct nfs_fh *mntfh,
1058 const char *dev_name)
1059 {
1060 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1061
1062 memset(args, 0, sizeof(*args));
1063
1064 if (data == NULL)
1065 goto out_no_data;
1066
1067 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1068 args->rsize = NFS_MAX_FILE_IO_SIZE;
1069 args->wsize = NFS_MAX_FILE_IO_SIZE;
1070 args->timeo = 600;
1071 args->retrans = 2;
1072 args->acregmin = 3;
1073 args->acregmax = 60;
1074 args->acdirmin = 30;
1075 args->acdirmax = 60;
1076 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1077 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1078
1079 switch (data->version) {
1080 case 1:
1081 data->namlen = 0;
1082 case 2:
1083 data->bsize = 0;
1084 case 3:
1085 if (data->flags & NFS_MOUNT_VER3)
1086 goto out_no_v3;
1087 data->root.size = NFS2_FHSIZE;
1088 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1089 case 4:
1090 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1091 goto out_no_sec;
1092 case 5:
1093 memset(data->context, 0, sizeof(data->context));
1094 case 6:
1095 if (data->flags & NFS_MOUNT_VER3)
1096 mntfh->size = data->root.size;
1097 else
1098 mntfh->size = NFS2_FHSIZE;
1099
1100 if (mntfh->size > sizeof(mntfh->data))
1101 goto out_invalid_fh;
1102
1103 memcpy(mntfh->data, data->root.data, mntfh->size);
1104 if (mntfh->size < sizeof(mntfh->data))
1105 memset(mntfh->data + mntfh->size, 0,
1106 sizeof(mntfh->data) - mntfh->size);
1107
1108 if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
1109 goto out_no_address;
1110
1111 /*
1112 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1113 * can deal with.
1114 */
1115 args->flags = data->flags;
1116 args->rsize = data->rsize;
1117 args->wsize = data->wsize;
1118 args->flags = data->flags;
1119 args->timeo = data->timeo;
1120 args->retrans = data->retrans;
1121 args->acregmin = data->acregmin;
1122 args->acregmax = data->acregmax;
1123 args->acdirmin = data->acdirmin;
1124 args->acdirmax = data->acdirmax;
1125 args->nfs_server.address = data->addr;
1126 if (!(data->flags & NFS_MOUNT_TCP))
1127 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1128 /* N.B. caller will free nfs_server.hostname in all cases */
1129 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1130 args->namlen = data->namlen;
1131 args->bsize = data->bsize;
1132 args->auth_flavors[0] = data->pseudoflavor;
1133 break;
1134 default: {
1135 unsigned int len;
1136 char *c;
1137 int status;
1138
1139 if (nfs_parse_mount_options((char *)options, args) == 0)
1140 return -EINVAL;
1141
1142 if (!nfs_verify_server_address((struct sockaddr *)
1143 &args->nfs_server.address))
1144 goto out_no_address;
1145
1146 c = strchr(dev_name, ':');
1147 if (c == NULL)
1148 return -EINVAL;
1149 len = c - dev_name;
1150 /* N.B. caller will free nfs_server.hostname in all cases */
1151 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1152
1153 c++;
1154 if (strlen(c) > NFS_MAXPATHLEN)
1155 return -ENAMETOOLONG;
1156 args->nfs_server.export_path = c;
1157
1158 status = nfs_try_mount(args, mntfh);
1159 if (status)
1160 return status;
1161
1162 break;
1163 }
1164 }
1165
1166 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1167 args->auth_flavors[0] = RPC_AUTH_UNIX;
1168
1169 #ifndef CONFIG_NFS_V3
1170 if (args->flags & NFS_MOUNT_VER3)
1171 goto out_v3_not_compiled;
1172 #endif /* !CONFIG_NFS_V3 */
1173
1174 return 0;
1175
1176 out_no_data:
1177 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1178 return -EINVAL;
1179
1180 out_no_v3:
1181 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1182 data->version);
1183 return -EINVAL;
1184
1185 out_no_sec:
1186 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1187 return -EINVAL;
1188
1189 #ifndef CONFIG_NFS_V3
1190 out_v3_not_compiled:
1191 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1192 return -EPROTONOSUPPORT;
1193 #endif /* !CONFIG_NFS_V3 */
1194
1195 out_no_address:
1196 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1197 return -EINVAL;
1198
1199 out_invalid_fh:
1200 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1201 return -EINVAL;
1202 }
1203
1204 /*
1205 * Initialise the common bits of the superblock
1206 */
1207 static inline void nfs_initialise_sb(struct super_block *sb)
1208 {
1209 struct nfs_server *server = NFS_SB(sb);
1210
1211 sb->s_magic = NFS_SUPER_MAGIC;
1212
1213 /* We probably want something more informative here */
1214 snprintf(sb->s_id, sizeof(sb->s_id),
1215 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1216
1217 if (sb->s_blocksize == 0)
1218 sb->s_blocksize = nfs_block_bits(server->wsize,
1219 &sb->s_blocksize_bits);
1220
1221 if (server->flags & NFS_MOUNT_NOAC)
1222 sb->s_flags |= MS_SYNCHRONOUS;
1223
1224 nfs_super_set_maxbytes(sb, server->maxfilesize);
1225 }
1226
1227 /*
1228 * Finish setting up an NFS2/3 superblock
1229 */
1230 static void nfs_fill_super(struct super_block *sb,
1231 struct nfs_parsed_mount_data *data)
1232 {
1233 struct nfs_server *server = NFS_SB(sb);
1234
1235 sb->s_blocksize_bits = 0;
1236 sb->s_blocksize = 0;
1237 if (data->bsize)
1238 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1239
1240 if (server->flags & NFS_MOUNT_VER3) {
1241 /* The VFS shouldn't apply the umask to mode bits. We will do
1242 * so ourselves when necessary.
1243 */
1244 sb->s_flags |= MS_POSIXACL;
1245 sb->s_time_gran = 1;
1246 }
1247
1248 sb->s_op = &nfs_sops;
1249 nfs_initialise_sb(sb);
1250 }
1251
1252 /*
1253 * Finish setting up a cloned NFS2/3 superblock
1254 */
1255 static void nfs_clone_super(struct super_block *sb,
1256 const struct super_block *old_sb)
1257 {
1258 struct nfs_server *server = NFS_SB(sb);
1259
1260 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1261 sb->s_blocksize = old_sb->s_blocksize;
1262 sb->s_maxbytes = old_sb->s_maxbytes;
1263
1264 if (server->flags & NFS_MOUNT_VER3) {
1265 /* The VFS shouldn't apply the umask to mode bits. We will do
1266 * so ourselves when necessary.
1267 */
1268 sb->s_flags |= MS_POSIXACL;
1269 sb->s_time_gran = 1;
1270 }
1271
1272 sb->s_op = old_sb->s_op;
1273 nfs_initialise_sb(sb);
1274 }
1275
1276 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1277
1278 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1279 {
1280 const struct nfs_server *a = s->s_fs_info;
1281 const struct rpc_clnt *clnt_a = a->client;
1282 const struct rpc_clnt *clnt_b = b->client;
1283
1284 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1285 goto Ebusy;
1286 if (a->nfs_client != b->nfs_client)
1287 goto Ebusy;
1288 if (a->flags != b->flags)
1289 goto Ebusy;
1290 if (a->wsize != b->wsize)
1291 goto Ebusy;
1292 if (a->rsize != b->rsize)
1293 goto Ebusy;
1294 if (a->acregmin != b->acregmin)
1295 goto Ebusy;
1296 if (a->acregmax != b->acregmax)
1297 goto Ebusy;
1298 if (a->acdirmin != b->acdirmin)
1299 goto Ebusy;
1300 if (a->acdirmax != b->acdirmax)
1301 goto Ebusy;
1302 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1303 goto Ebusy;
1304 return 1;
1305 Ebusy:
1306 return 0;
1307 }
1308
1309 struct nfs_sb_mountdata {
1310 struct nfs_server *server;
1311 int mntflags;
1312 };
1313
1314 static int nfs_set_super(struct super_block *s, void *data)
1315 {
1316 struct nfs_sb_mountdata *sb_mntdata = data;
1317 struct nfs_server *server = sb_mntdata->server;
1318 int ret;
1319
1320 s->s_flags = sb_mntdata->mntflags;
1321 s->s_fs_info = server;
1322 ret = set_anon_super(s, server);
1323 if (ret == 0)
1324 server->s_dev = s->s_dev;
1325 return ret;
1326 }
1327
1328 static int nfs_compare_super(struct super_block *sb, void *data)
1329 {
1330 struct nfs_sb_mountdata *sb_mntdata = data;
1331 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1332 int mntflags = sb_mntdata->mntflags;
1333
1334 if (memcmp(&old->nfs_client->cl_addr,
1335 &server->nfs_client->cl_addr,
1336 sizeof(old->nfs_client->cl_addr)) != 0)
1337 return 0;
1338 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1339 if (old->flags & NFS_MOUNT_UNSHARED)
1340 return 0;
1341 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1342 return 0;
1343 return nfs_compare_mount_options(sb, server, mntflags);
1344 }
1345
1346 static int nfs_get_sb(struct file_system_type *fs_type,
1347 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1348 {
1349 struct nfs_server *server = NULL;
1350 struct super_block *s;
1351 struct nfs_fh mntfh;
1352 struct nfs_parsed_mount_data data;
1353 struct dentry *mntroot;
1354 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1355 struct nfs_sb_mountdata sb_mntdata = {
1356 .mntflags = flags,
1357 };
1358 int error;
1359
1360 /* Validate the mount data */
1361 error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1362 if (error < 0)
1363 goto out;
1364
1365 /* Get a volume representation */
1366 server = nfs_create_server(&data, &mntfh);
1367 if (IS_ERR(server)) {
1368 error = PTR_ERR(server);
1369 goto out;
1370 }
1371 sb_mntdata.server = server;
1372
1373 if (server->flags & NFS_MOUNT_UNSHARED)
1374 compare_super = NULL;
1375
1376 /* Get a superblock - note that we may end up sharing one that already exists */
1377 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1378 if (IS_ERR(s)) {
1379 error = PTR_ERR(s);
1380 goto out_err_nosb;
1381 }
1382
1383 if (s->s_fs_info != server) {
1384 nfs_free_server(server);
1385 server = NULL;
1386 }
1387
1388 if (!s->s_root) {
1389 /* initial superblock/root creation */
1390 nfs_fill_super(s, &data);
1391 }
1392
1393 mntroot = nfs_get_root(s, &mntfh);
1394 if (IS_ERR(mntroot)) {
1395 error = PTR_ERR(mntroot);
1396 goto error_splat_super;
1397 }
1398
1399 s->s_flags |= MS_ACTIVE;
1400 mnt->mnt_sb = s;
1401 mnt->mnt_root = mntroot;
1402 error = 0;
1403
1404 out:
1405 kfree(data.nfs_server.hostname);
1406 return error;
1407
1408 out_err_nosb:
1409 nfs_free_server(server);
1410 goto out;
1411
1412 error_splat_super:
1413 up_write(&s->s_umount);
1414 deactivate_super(s);
1415 goto out;
1416 }
1417
1418 /*
1419 * Destroy an NFS2/3 superblock
1420 */
1421 static void nfs_kill_super(struct super_block *s)
1422 {
1423 struct nfs_server *server = NFS_SB(s);
1424
1425 kill_anon_super(s);
1426 nfs_free_server(server);
1427 }
1428
1429 /*
1430 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1431 */
1432 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1433 const char *dev_name, void *raw_data,
1434 struct vfsmount *mnt)
1435 {
1436 struct nfs_clone_mount *data = raw_data;
1437 struct super_block *s;
1438 struct nfs_server *server;
1439 struct dentry *mntroot;
1440 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1441 struct nfs_sb_mountdata sb_mntdata = {
1442 .mntflags = flags,
1443 };
1444 int error;
1445
1446 dprintk("--> nfs_xdev_get_sb()\n");
1447
1448 /* create a new volume representation */
1449 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1450 if (IS_ERR(server)) {
1451 error = PTR_ERR(server);
1452 goto out_err_noserver;
1453 }
1454 sb_mntdata.server = server;
1455
1456 if (server->flags & NFS_MOUNT_UNSHARED)
1457 compare_super = NULL;
1458
1459 /* Get a superblock - note that we may end up sharing one that already exists */
1460 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1461 if (IS_ERR(s)) {
1462 error = PTR_ERR(s);
1463 goto out_err_nosb;
1464 }
1465
1466 if (s->s_fs_info != server) {
1467 nfs_free_server(server);
1468 server = NULL;
1469 }
1470
1471 if (!s->s_root) {
1472 /* initial superblock/root creation */
1473 nfs_clone_super(s, data->sb);
1474 }
1475
1476 mntroot = nfs_get_root(s, data->fh);
1477 if (IS_ERR(mntroot)) {
1478 error = PTR_ERR(mntroot);
1479 goto error_splat_super;
1480 }
1481 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1482 dput(mntroot);
1483 error = -ESTALE;
1484 goto error_splat_super;
1485 }
1486
1487 s->s_flags |= MS_ACTIVE;
1488 mnt->mnt_sb = s;
1489 mnt->mnt_root = mntroot;
1490
1491 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1492 return 0;
1493
1494 out_err_nosb:
1495 nfs_free_server(server);
1496 out_err_noserver:
1497 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1498 return error;
1499
1500 error_splat_super:
1501 up_write(&s->s_umount);
1502 deactivate_super(s);
1503 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1504 return error;
1505 }
1506
1507 #ifdef CONFIG_NFS_V4
1508
1509 /*
1510 * Finish setting up a cloned NFS4 superblock
1511 */
1512 static void nfs4_clone_super(struct super_block *sb,
1513 const struct super_block *old_sb)
1514 {
1515 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1516 sb->s_blocksize = old_sb->s_blocksize;
1517 sb->s_maxbytes = old_sb->s_maxbytes;
1518 sb->s_time_gran = 1;
1519 sb->s_op = old_sb->s_op;
1520 nfs_initialise_sb(sb);
1521 }
1522
1523 /*
1524 * Set up an NFS4 superblock
1525 */
1526 static void nfs4_fill_super(struct super_block *sb)
1527 {
1528 sb->s_time_gran = 1;
1529 sb->s_op = &nfs4_sops;
1530 nfs_initialise_sb(sb);
1531 }
1532
1533 /*
1534 * Validate NFSv4 mount options
1535 */
1536 static int nfs4_validate_mount_data(void *options,
1537 struct nfs_parsed_mount_data *args,
1538 const char *dev_name)
1539 {
1540 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1541 char *c;
1542
1543 memset(args, 0, sizeof(*args));
1544
1545 if (data == NULL)
1546 goto out_no_data;
1547
1548 args->rsize = NFS_MAX_FILE_IO_SIZE;
1549 args->wsize = NFS_MAX_FILE_IO_SIZE;
1550 args->timeo = 600;
1551 args->retrans = 2;
1552 args->acregmin = 3;
1553 args->acregmax = 60;
1554 args->acdirmin = 30;
1555 args->acdirmax = 60;
1556 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1557
1558 switch (data->version) {
1559 case 1:
1560 if (data->host_addrlen != sizeof(args->nfs_server.address))
1561 goto out_no_address;
1562 if (copy_from_user(&args->nfs_server.address,
1563 data->host_addr,
1564 sizeof(args->nfs_server.address)))
1565 return -EFAULT;
1566 if (args->nfs_server.address.sin_port == 0)
1567 args->nfs_server.address.sin_port = htons(NFS_PORT);
1568 if (!nfs_verify_server_address((struct sockaddr *)
1569 &args->nfs_server.address))
1570 goto out_no_address;
1571
1572 switch (data->auth_flavourlen) {
1573 case 0:
1574 args->auth_flavors[0] = RPC_AUTH_UNIX;
1575 break;
1576 case 1:
1577 if (copy_from_user(&args->auth_flavors[0],
1578 data->auth_flavours,
1579 sizeof(args->auth_flavors[0])))
1580 return -EFAULT;
1581 break;
1582 default:
1583 goto out_inval_auth;
1584 }
1585
1586 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1587 if (IS_ERR(c))
1588 return PTR_ERR(c);
1589 args->nfs_server.hostname = c;
1590
1591 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1592 if (IS_ERR(c))
1593 return PTR_ERR(c);
1594 args->nfs_server.export_path = c;
1595 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1596
1597 c = strndup_user(data->client_addr.data, 16);
1598 if (IS_ERR(c))
1599 return PTR_ERR(c);
1600 args->client_address = c;
1601
1602 /*
1603 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1604 * can deal with.
1605 */
1606
1607 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1608 args->rsize = data->rsize;
1609 args->wsize = data->wsize;
1610 args->timeo = data->timeo;
1611 args->retrans = data->retrans;
1612 args->acregmin = data->acregmin;
1613 args->acregmax = data->acregmax;
1614 args->acdirmin = data->acdirmin;
1615 args->acdirmax = data->acdirmax;
1616 args->nfs_server.protocol = data->proto;
1617
1618 break;
1619 default: {
1620 unsigned int len;
1621
1622 if (nfs_parse_mount_options((char *)options, args) == 0)
1623 return -EINVAL;
1624
1625 if (args->nfs_server.address.sin_port == 0)
1626 args->nfs_server.address.sin_port = htons(NFS_PORT);
1627 if (!nfs_verify_server_address((struct sockaddr *)
1628 &args->nfs_server.address))
1629 return -EINVAL;
1630
1631 switch (args->auth_flavor_len) {
1632 case 0:
1633 args->auth_flavors[0] = RPC_AUTH_UNIX;
1634 break;
1635 case 1:
1636 break;
1637 default:
1638 goto out_inval_auth;
1639 }
1640
1641 /*
1642 * Split "dev_name" into "hostname:mntpath".
1643 */
1644 c = strchr(dev_name, ':');
1645 if (c == NULL)
1646 return -EINVAL;
1647 /* while calculating len, pretend ':' is '\0' */
1648 len = c - dev_name;
1649 if (len > NFS4_MAXNAMLEN)
1650 return -ENAMETOOLONG;
1651 /* N.B. caller will free nfs_server.hostname in all cases */
1652 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1653
1654 c++; /* step over the ':' */
1655 len = strlen(c);
1656 if (len > NFS4_MAXPATHLEN)
1657 return -ENAMETOOLONG;
1658 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1659
1660 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1661
1662 if (args->client_address == NULL)
1663 goto out_no_client_address;
1664
1665 break;
1666 }
1667 }
1668
1669 return 0;
1670
1671 out_no_data:
1672 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1673 return -EINVAL;
1674
1675 out_inval_auth:
1676 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1677 data->auth_flavourlen);
1678 return -EINVAL;
1679
1680 out_no_address:
1681 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1682 return -EINVAL;
1683
1684 out_no_client_address:
1685 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1686 return -EINVAL;
1687 }
1688
1689 /*
1690 * Get the superblock for an NFS4 mountpoint
1691 */
1692 static int nfs4_get_sb(struct file_system_type *fs_type,
1693 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1694 {
1695 struct nfs_parsed_mount_data data;
1696 struct super_block *s;
1697 struct nfs_server *server;
1698 struct nfs_fh mntfh;
1699 struct dentry *mntroot;
1700 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1701 struct nfs_sb_mountdata sb_mntdata = {
1702 .mntflags = flags,
1703 };
1704 int error;
1705
1706 /* Validate the mount data */
1707 error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1708 if (error < 0)
1709 goto out;
1710
1711 /* Get a volume representation */
1712 server = nfs4_create_server(&data, &mntfh);
1713 if (IS_ERR(server)) {
1714 error = PTR_ERR(server);
1715 goto out;
1716 }
1717 sb_mntdata.server = server;
1718
1719 if (server->flags & NFS4_MOUNT_UNSHARED)
1720 compare_super = NULL;
1721
1722 /* Get a superblock - note that we may end up sharing one that already exists */
1723 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1724 if (IS_ERR(s)) {
1725 error = PTR_ERR(s);
1726 goto out_free;
1727 }
1728
1729 if (s->s_fs_info != server) {
1730 nfs_free_server(server);
1731 server = NULL;
1732 }
1733
1734 if (!s->s_root) {
1735 /* initial superblock/root creation */
1736 nfs4_fill_super(s);
1737 }
1738
1739 mntroot = nfs4_get_root(s, &mntfh);
1740 if (IS_ERR(mntroot)) {
1741 error = PTR_ERR(mntroot);
1742 goto error_splat_super;
1743 }
1744
1745 s->s_flags |= MS_ACTIVE;
1746 mnt->mnt_sb = s;
1747 mnt->mnt_root = mntroot;
1748 error = 0;
1749
1750 out:
1751 kfree(data.client_address);
1752 kfree(data.nfs_server.export_path);
1753 kfree(data.nfs_server.hostname);
1754 return error;
1755
1756 out_free:
1757 nfs_free_server(server);
1758 goto out;
1759
1760 error_splat_super:
1761 up_write(&s->s_umount);
1762 deactivate_super(s);
1763 goto out;
1764 }
1765
1766 static void nfs4_kill_super(struct super_block *sb)
1767 {
1768 struct nfs_server *server = NFS_SB(sb);
1769
1770 nfs_return_all_delegations(sb);
1771 kill_anon_super(sb);
1772
1773 nfs4_renewd_prepare_shutdown(server);
1774 nfs_free_server(server);
1775 }
1776
1777 /*
1778 * Clone an NFS4 server record on xdev traversal (FSID-change)
1779 */
1780 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1781 const char *dev_name, void *raw_data,
1782 struct vfsmount *mnt)
1783 {
1784 struct nfs_clone_mount *data = raw_data;
1785 struct super_block *s;
1786 struct nfs_server *server;
1787 struct dentry *mntroot;
1788 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1789 struct nfs_sb_mountdata sb_mntdata = {
1790 .mntflags = flags,
1791 };
1792 int error;
1793
1794 dprintk("--> nfs4_xdev_get_sb()\n");
1795
1796 /* create a new volume representation */
1797 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1798 if (IS_ERR(server)) {
1799 error = PTR_ERR(server);
1800 goto out_err_noserver;
1801 }
1802 sb_mntdata.server = server;
1803
1804 if (server->flags & NFS4_MOUNT_UNSHARED)
1805 compare_super = NULL;
1806
1807 /* Get a superblock - note that we may end up sharing one that already exists */
1808 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1809 if (IS_ERR(s)) {
1810 error = PTR_ERR(s);
1811 goto out_err_nosb;
1812 }
1813
1814 if (s->s_fs_info != server) {
1815 nfs_free_server(server);
1816 server = NULL;
1817 }
1818
1819 if (!s->s_root) {
1820 /* initial superblock/root creation */
1821 nfs4_clone_super(s, data->sb);
1822 }
1823
1824 mntroot = nfs4_get_root(s, data->fh);
1825 if (IS_ERR(mntroot)) {
1826 error = PTR_ERR(mntroot);
1827 goto error_splat_super;
1828 }
1829 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1830 dput(mntroot);
1831 error = -ESTALE;
1832 goto error_splat_super;
1833 }
1834
1835 s->s_flags |= MS_ACTIVE;
1836 mnt->mnt_sb = s;
1837 mnt->mnt_root = mntroot;
1838
1839 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1840 return 0;
1841
1842 out_err_nosb:
1843 nfs_free_server(server);
1844 out_err_noserver:
1845 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
1846 return error;
1847
1848 error_splat_super:
1849 up_write(&s->s_umount);
1850 deactivate_super(s);
1851 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
1852 return error;
1853 }
1854
1855 /*
1856 * Create an NFS4 server record on referral traversal
1857 */
1858 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
1859 const char *dev_name, void *raw_data,
1860 struct vfsmount *mnt)
1861 {
1862 struct nfs_clone_mount *data = raw_data;
1863 struct super_block *s;
1864 struct nfs_server *server;
1865 struct dentry *mntroot;
1866 struct nfs_fh mntfh;
1867 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1868 struct nfs_sb_mountdata sb_mntdata = {
1869 .mntflags = flags,
1870 };
1871 int error;
1872
1873 dprintk("--> nfs4_referral_get_sb()\n");
1874
1875 /* create a new volume representation */
1876 server = nfs4_create_referral_server(data, &mntfh);
1877 if (IS_ERR(server)) {
1878 error = PTR_ERR(server);
1879 goto out_err_noserver;
1880 }
1881 sb_mntdata.server = server;
1882
1883 if (server->flags & NFS4_MOUNT_UNSHARED)
1884 compare_super = NULL;
1885
1886 /* Get a superblock - note that we may end up sharing one that already exists */
1887 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1888 if (IS_ERR(s)) {
1889 error = PTR_ERR(s);
1890 goto out_err_nosb;
1891 }
1892
1893 if (s->s_fs_info != server) {
1894 nfs_free_server(server);
1895 server = NULL;
1896 }
1897
1898 if (!s->s_root) {
1899 /* initial superblock/root creation */
1900 nfs4_fill_super(s);
1901 }
1902
1903 mntroot = nfs4_get_root(s, &mntfh);
1904 if (IS_ERR(mntroot)) {
1905 error = PTR_ERR(mntroot);
1906 goto error_splat_super;
1907 }
1908 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1909 dput(mntroot);
1910 error = -ESTALE;
1911 goto error_splat_super;
1912 }
1913
1914 s->s_flags |= MS_ACTIVE;
1915 mnt->mnt_sb = s;
1916 mnt->mnt_root = mntroot;
1917
1918 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1919 return 0;
1920
1921 out_err_nosb:
1922 nfs_free_server(server);
1923 out_err_noserver:
1924 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
1925 return error;
1926
1927 error_splat_super:
1928 up_write(&s->s_umount);
1929 deactivate_super(s);
1930 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
1931 return error;
1932 }
1933
1934 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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