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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 */
17
18 #include <linux/config.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21
22 #include <linux/time.h>
23 #include <linux/kernel.h>
24 #include <linux/mm.h>
25 #include <linux/string.h>
26 #include <linux/stat.h>
27 #include <linux/errno.h>
28 #include <linux/unistd.h>
29 #include <linux/sunrpc/clnt.h>
30 #include <linux/sunrpc/stats.h>
31 #include <linux/sunrpc/metrics.h>
32 #include <linux/nfs_fs.h>
33 #include <linux/nfs_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/lockd/bind.h>
36 #include <linux/smp_lock.h>
37 #include <linux/seq_file.h>
38 #include <linux/mount.h>
39 #include <linux/nfs_idmap.h>
40 #include <linux/vfs.h>
41 #include <linux/inet.h>
42 #include <linux/nfs_xdr.h>
43
44 #include <asm/system.h>
45 #include <asm/uaccess.h>
46
47 #include "nfs4_fs.h"
48 #include "callback.h"
49 #include "delegation.h"
50 #include "iostat.h"
51 #include "internal.h"
52
53 #define NFSDBG_FACILITY NFSDBG_VFS
54
55 /* Maximum number of readahead requests
56 * FIXME: this should really be a sysctl so that users may tune it to suit
57 * their needs. People that do NFS over a slow network, might for
58 * instance want to reduce it to something closer to 1 for improved
59 * interactive response.
60 */
61 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
62
63 /*
64 * RPC cruft for NFS
65 */
66 static struct rpc_version * nfs_version[] = {
67 NULL,
68 NULL,
69 &nfs_version2,
70 #if defined(CONFIG_NFS_V3)
71 &nfs_version3,
72 #elif defined(CONFIG_NFS_V4)
73 NULL,
74 #endif
75 #if defined(CONFIG_NFS_V4)
76 &nfs_version4,
77 #endif
78 };
79
80 static struct rpc_program nfs_program = {
81 .name = "nfs",
82 .number = NFS_PROGRAM,
83 .nrvers = ARRAY_SIZE(nfs_version),
84 .version = nfs_version,
85 .stats = &nfs_rpcstat,
86 .pipe_dir_name = "/nfs",
87 };
88
89 struct rpc_stat nfs_rpcstat = {
90 .program = &nfs_program
91 };
92
93
94 #ifdef CONFIG_NFS_V3_ACL
95 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
96 static struct rpc_version * nfsacl_version[] = {
97 [3] = &nfsacl_version3,
98 };
99
100 struct rpc_program nfsacl_program = {
101 .name = "nfsacl",
102 .number = NFS_ACL_PROGRAM,
103 .nrvers = ARRAY_SIZE(nfsacl_version),
104 .version = nfsacl_version,
105 .stats = &nfsacl_rpcstat,
106 };
107 #endif /* CONFIG_NFS_V3_ACL */
108
109 static void nfs_umount_begin(struct vfsmount *, int);
110 static int nfs_statfs(struct dentry *, struct kstatfs *);
111 static int nfs_show_options(struct seq_file *, struct vfsmount *);
112 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
113 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
114 static int nfs_clone_nfs_sb(struct file_system_type *fs_type,
115 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
116 static void nfs_kill_super(struct super_block *);
117
118 static struct file_system_type nfs_fs_type = {
119 .owner = THIS_MODULE,
120 .name = "nfs",
121 .get_sb = nfs_get_sb,
122 .kill_sb = nfs_kill_super,
123 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
124 };
125
126 struct file_system_type clone_nfs_fs_type = {
127 .owner = THIS_MODULE,
128 .name = "nfs",
129 .get_sb = nfs_clone_nfs_sb,
130 .kill_sb = nfs_kill_super,
131 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
132 };
133
134 static struct super_operations nfs_sops = {
135 .alloc_inode = nfs_alloc_inode,
136 .destroy_inode = nfs_destroy_inode,
137 .write_inode = nfs_write_inode,
138 .statfs = nfs_statfs,
139 .clear_inode = nfs_clear_inode,
140 .umount_begin = nfs_umount_begin,
141 .show_options = nfs_show_options,
142 .show_stats = nfs_show_stats,
143 };
144
145 #ifdef CONFIG_NFS_V4
146 static int nfs4_get_sb(struct file_system_type *fs_type,
147 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
148 static int nfs_clone_nfs4_sb(struct file_system_type *fs_type,
149 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
150 static int nfs_referral_nfs4_sb(struct file_system_type *fs_type,
151 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
152 static void nfs4_kill_super(struct super_block *sb);
153
154 static struct file_system_type nfs4_fs_type = {
155 .owner = THIS_MODULE,
156 .name = "nfs4",
157 .get_sb = nfs4_get_sb,
158 .kill_sb = nfs4_kill_super,
159 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
160 };
161
162 struct file_system_type clone_nfs4_fs_type = {
163 .owner = THIS_MODULE,
164 .name = "nfs4",
165 .get_sb = nfs_clone_nfs4_sb,
166 .kill_sb = nfs4_kill_super,
167 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
168 };
169
170 struct file_system_type nfs_referral_nfs4_fs_type = {
171 .owner = THIS_MODULE,
172 .name = "nfs4",
173 .get_sb = nfs_referral_nfs4_sb,
174 .kill_sb = nfs4_kill_super,
175 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
176 };
177
178 static struct super_operations nfs4_sops = {
179 .alloc_inode = nfs_alloc_inode,
180 .destroy_inode = nfs_destroy_inode,
181 .write_inode = nfs_write_inode,
182 .statfs = nfs_statfs,
183 .clear_inode = nfs4_clear_inode,
184 .umount_begin = nfs_umount_begin,
185 .show_options = nfs_show_options,
186 .show_stats = nfs_show_stats,
187 };
188 #endif
189
190 #ifdef CONFIG_NFS_V4
191 static const int nfs_set_port_min = 0;
192 static const int nfs_set_port_max = 65535;
193
194 static int param_set_port(const char *val, struct kernel_param *kp)
195 {
196 char *endp;
197 int num = simple_strtol(val, &endp, 0);
198 if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
199 return -EINVAL;
200 *((int *)kp->arg) = num;
201 return 0;
202 }
203
204 module_param_call(callback_tcpport, param_set_port, param_get_int,
205 &nfs_callback_set_tcpport, 0644);
206 #endif
207
208 #ifdef CONFIG_NFS_V4
209 static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
210 {
211 char *endp;
212 int num = simple_strtol(val, &endp, 0);
213 int jif = num * HZ;
214 if (endp == val || *endp || num < 0 || jif < num)
215 return -EINVAL;
216 *((int *)kp->arg) = jif;
217 return 0;
218 }
219
220 module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
221 &nfs_idmap_cache_timeout, 0644);
222 #endif
223
224 /*
225 * Register the NFS filesystems
226 */
227 int __init register_nfs_fs(void)
228 {
229 int ret;
230
231 ret = register_filesystem(&nfs_fs_type);
232 if (ret < 0)
233 goto error_0;
234
235 #ifdef CONFIG_NFS_V4
236 ret = nfs_register_sysctl();
237 if (ret < 0)
238 goto error_1;
239 ret = register_filesystem(&nfs4_fs_type);
240 if (ret < 0)
241 goto error_2;
242 #endif
243 return 0;
244
245 #ifdef CONFIG_NFS_V4
246 error_2:
247 nfs_unregister_sysctl();
248 error_1:
249 unregister_filesystem(&nfs_fs_type);
250 #endif
251 error_0:
252 return ret;
253 }
254
255 /*
256 * Unregister the NFS filesystems
257 */
258 void __exit unregister_nfs_fs(void)
259 {
260 #ifdef CONFIG_NFS_V4
261 unregister_filesystem(&nfs4_fs_type);
262 nfs_unregister_sysctl();
263 #endif
264 unregister_filesystem(&nfs_fs_type);
265 }
266
267 /*
268 * Deliver file system statistics to userspace
269 */
270 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
271 {
272 struct super_block *sb = dentry->d_sb;
273 struct nfs_server *server = NFS_SB(sb);
274 unsigned char blockbits;
275 unsigned long blockres;
276 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
277 struct nfs_fattr fattr;
278 struct nfs_fsstat res = {
279 .fattr = &fattr,
280 };
281 int error;
282
283 lock_kernel();
284
285 error = server->rpc_ops->statfs(server, rootfh, &res);
286 buf->f_type = NFS_SUPER_MAGIC;
287 if (error < 0)
288 goto out_err;
289
290 /*
291 * Current versions of glibc do not correctly handle the
292 * case where f_frsize != f_bsize. Eventually we want to
293 * report the value of wtmult in this field.
294 */
295 buf->f_frsize = sb->s_blocksize;
296
297 /*
298 * On most *nix systems, f_blocks, f_bfree, and f_bavail
299 * are reported in units of f_frsize. Linux hasn't had
300 * an f_frsize field in its statfs struct until recently,
301 * thus historically Linux's sys_statfs reports these
302 * fields in units of f_bsize.
303 */
304 buf->f_bsize = sb->s_blocksize;
305 blockbits = sb->s_blocksize_bits;
306 blockres = (1 << blockbits) - 1;
307 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
308 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
309 buf->f_bavail = (res.abytes + blockres) >> blockbits;
310
311 buf->f_files = res.tfiles;
312 buf->f_ffree = res.afiles;
313
314 buf->f_namelen = server->namelen;
315 out:
316 unlock_kernel();
317 return 0;
318
319 out_err:
320 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
321 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
322 goto out;
323
324 }
325
326 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
327 {
328 static struct {
329 rpc_authflavor_t flavour;
330 const char *str;
331 } sec_flavours[] = {
332 { RPC_AUTH_NULL, "null" },
333 { RPC_AUTH_UNIX, "sys" },
334 { RPC_AUTH_GSS_KRB5, "krb5" },
335 { RPC_AUTH_GSS_KRB5I, "krb5i" },
336 { RPC_AUTH_GSS_KRB5P, "krb5p" },
337 { RPC_AUTH_GSS_LKEY, "lkey" },
338 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
339 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
340 { RPC_AUTH_GSS_SPKM, "spkm" },
341 { RPC_AUTH_GSS_SPKMI, "spkmi" },
342 { RPC_AUTH_GSS_SPKMP, "spkmp" },
343 { -1, "unknown" }
344 };
345 int i;
346
347 for (i=0; sec_flavours[i].flavour != -1; i++) {
348 if (sec_flavours[i].flavour == flavour)
349 break;
350 }
351 return sec_flavours[i].str;
352 }
353
354 /*
355 * Describe the mount options in force on this server representation
356 */
357 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
358 {
359 static struct proc_nfs_info {
360 int flag;
361 char *str;
362 char *nostr;
363 } nfs_info[] = {
364 { NFS_MOUNT_SOFT, ",soft", ",hard" },
365 { NFS_MOUNT_INTR, ",intr", "" },
366 { NFS_MOUNT_NOCTO, ",nocto", "" },
367 { NFS_MOUNT_NOAC, ",noac", "" },
368 { NFS_MOUNT_NONLM, ",nolock", "" },
369 { NFS_MOUNT_NOACL, ",noacl", "" },
370 { 0, NULL, NULL }
371 };
372 struct proc_nfs_info *nfs_infop;
373 char buf[12];
374 char *proto;
375
376 seq_printf(m, ",vers=%d", nfss->rpc_ops->version);
377 seq_printf(m, ",rsize=%d", nfss->rsize);
378 seq_printf(m, ",wsize=%d", nfss->wsize);
379 if (nfss->acregmin != 3*HZ || showdefaults)
380 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
381 if (nfss->acregmax != 60*HZ || showdefaults)
382 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
383 if (nfss->acdirmin != 30*HZ || showdefaults)
384 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
385 if (nfss->acdirmax != 60*HZ || showdefaults)
386 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
387 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
388 if (nfss->flags & nfs_infop->flag)
389 seq_puts(m, nfs_infop->str);
390 else
391 seq_puts(m, nfs_infop->nostr);
392 }
393 switch (nfss->client->cl_xprt->prot) {
394 case IPPROTO_TCP:
395 proto = "tcp";
396 break;
397 case IPPROTO_UDP:
398 proto = "udp";
399 break;
400 default:
401 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
402 proto = buf;
403 }
404 seq_printf(m, ",proto=%s", proto);
405 seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ);
406 seq_printf(m, ",retrans=%u", nfss->retrans_count);
407 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
408 }
409
410 /*
411 * Describe the mount options on this VFS mountpoint
412 */
413 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
414 {
415 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
416
417 nfs_show_mount_options(m, nfss, 0);
418
419 seq_puts(m, ",addr=");
420 seq_escape(m, nfss->hostname, " \t\n\\");
421
422 return 0;
423 }
424
425 /*
426 * Present statistical information for this VFS mountpoint
427 */
428 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
429 {
430 int i, cpu;
431 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
432 struct rpc_auth *auth = nfss->client->cl_auth;
433 struct nfs_iostats totals = { };
434
435 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
436
437 /*
438 * Display all mount option settings
439 */
440 seq_printf(m, "\n\topts:\t");
441 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
442 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
443 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
444 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
445 nfs_show_mount_options(m, nfss, 1);
446
447 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
448
449 seq_printf(m, "\n\tcaps:\t");
450 seq_printf(m, "caps=0x%x", nfss->caps);
451 seq_printf(m, ",wtmult=%d", nfss->wtmult);
452 seq_printf(m, ",dtsize=%d", nfss->dtsize);
453 seq_printf(m, ",bsize=%d", nfss->bsize);
454 seq_printf(m, ",namelen=%d", nfss->namelen);
455
456 #ifdef CONFIG_NFS_V4
457 if (nfss->rpc_ops->version == 4) {
458 seq_printf(m, "\n\tnfsv4:\t");
459 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
460 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
461 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
462 }
463 #endif
464
465 /*
466 * Display security flavor in effect for this mount
467 */
468 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
469 if (auth->au_flavor)
470 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
471
472 /*
473 * Display superblock I/O counters
474 */
475 for_each_possible_cpu(cpu) {
476 struct nfs_iostats *stats;
477
478 preempt_disable();
479 stats = per_cpu_ptr(nfss->io_stats, cpu);
480
481 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
482 totals.events[i] += stats->events[i];
483 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
484 totals.bytes[i] += stats->bytes[i];
485
486 preempt_enable();
487 }
488
489 seq_printf(m, "\n\tevents:\t");
490 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
491 seq_printf(m, "%lu ", totals.events[i]);
492 seq_printf(m, "\n\tbytes:\t");
493 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
494 seq_printf(m, "%Lu ", totals.bytes[i]);
495 seq_printf(m, "\n");
496
497 rpc_print_iostats(m, nfss->client);
498
499 return 0;
500 }
501
502 /*
503 * Begin unmount by attempting to remove all automounted mountpoints we added
504 * in response to traversals
505 */
506 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
507 {
508 struct nfs_server *server;
509 struct rpc_clnt *rpc;
510
511 shrink_submounts(vfsmnt, &nfs_automount_list);
512 if (!(flags & MNT_FORCE))
513 return;
514 /* -EIO all pending I/O */
515 server = NFS_SB(vfsmnt->mnt_sb);
516 rpc = server->client;
517 if (!IS_ERR(rpc))
518 rpc_killall_tasks(rpc);
519 rpc = server->client_acl;
520 if (!IS_ERR(rpc))
521 rpc_killall_tasks(rpc);
522 }
523
524 /*
525 * Obtain the root inode of the file system.
526 */
527 static struct inode *
528 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
529 {
530 struct nfs_server *server = NFS_SB(sb);
531 int error;
532
533 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
534 if (error < 0) {
535 dprintk("nfs_get_root: getattr error = %d\n", -error);
536 return ERR_PTR(error);
537 }
538
539 server->fsid = fsinfo->fattr->fsid;
540 return nfs_fhget(sb, rootfh, fsinfo->fattr);
541 }
542
543 /*
544 * Do NFS version-independent mount processing, and sanity checking
545 */
546 static int
547 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
548 {
549 struct nfs_server *server;
550 struct inode *root_inode;
551 struct nfs_fattr fattr;
552 struct nfs_fsinfo fsinfo = {
553 .fattr = &fattr,
554 };
555 struct nfs_pathconf pathinfo = {
556 .fattr = &fattr,
557 };
558 int no_root_error = 0;
559 unsigned long max_rpc_payload;
560
561 /* We probably want something more informative here */
562 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
563
564 server = NFS_SB(sb);
565
566 sb->s_magic = NFS_SUPER_MAGIC;
567
568 server->io_stats = nfs_alloc_iostats();
569 if (server->io_stats == NULL)
570 return -ENOMEM;
571
572 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
573 /* Did getting the root inode fail? */
574 if (IS_ERR(root_inode)) {
575 no_root_error = PTR_ERR(root_inode);
576 goto out_no_root;
577 }
578 sb->s_root = d_alloc_root(root_inode);
579 if (!sb->s_root) {
580 no_root_error = -ENOMEM;
581 goto out_no_root;
582 }
583 sb->s_root->d_op = server->rpc_ops->dentry_ops;
584
585 /* mount time stamp, in seconds */
586 server->mount_time = jiffies;
587
588 /* Get some general file system info */
589 if (server->namelen == 0 &&
590 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
591 server->namelen = pathinfo.max_namelen;
592 /* Work out a lot of parameters */
593 if (server->rsize == 0)
594 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
595 if (server->wsize == 0)
596 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
597
598 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
599 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
600 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
601 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
602
603 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
604 if (server->rsize > max_rpc_payload)
605 server->rsize = max_rpc_payload;
606 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
607 server->rsize = NFS_MAX_FILE_IO_SIZE;
608 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
609
610 if (server->wsize > max_rpc_payload)
611 server->wsize = max_rpc_payload;
612 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
613 server->wsize = NFS_MAX_FILE_IO_SIZE;
614 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
615
616 if (sb->s_blocksize == 0)
617 sb->s_blocksize = nfs_block_bits(server->wsize,
618 &sb->s_blocksize_bits);
619 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
620
621 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
622 if (server->dtsize > PAGE_CACHE_SIZE)
623 server->dtsize = PAGE_CACHE_SIZE;
624 if (server->dtsize > server->rsize)
625 server->dtsize = server->rsize;
626
627 if (server->flags & NFS_MOUNT_NOAC) {
628 server->acregmin = server->acregmax = 0;
629 server->acdirmin = server->acdirmax = 0;
630 sb->s_flags |= MS_SYNCHRONOUS;
631 }
632 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
633
634 nfs_super_set_maxbytes(sb, fsinfo.maxfilesize);
635
636 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
637 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
638
639 /* We're airborne Set socket buffersize */
640 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
641 return 0;
642 /* Yargs. It didn't work out. */
643 out_no_root:
644 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
645 if (!IS_ERR(root_inode))
646 iput(root_inode);
647 return no_root_error;
648 }
649
650 /*
651 * Initialise the timeout values for a connection
652 */
653 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
654 {
655 to->to_initval = timeo * HZ / 10;
656 to->to_retries = retrans;
657 if (!to->to_retries)
658 to->to_retries = 2;
659
660 switch (proto) {
661 case IPPROTO_TCP:
662 if (!to->to_initval)
663 to->to_initval = 60 * HZ;
664 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
665 to->to_initval = NFS_MAX_TCP_TIMEOUT;
666 to->to_increment = to->to_initval;
667 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
668 to->to_exponential = 0;
669 break;
670 case IPPROTO_UDP:
671 default:
672 if (!to->to_initval)
673 to->to_initval = 11 * HZ / 10;
674 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
675 to->to_initval = NFS_MAX_UDP_TIMEOUT;
676 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
677 to->to_exponential = 1;
678 break;
679 }
680 }
681
682 /*
683 * Create an RPC client handle.
684 */
685 static struct rpc_clnt *
686 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
687 {
688 struct rpc_timeout timeparms;
689 struct rpc_xprt *xprt = NULL;
690 struct rpc_clnt *clnt = NULL;
691 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
692
693 nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
694
695 server->retrans_timeo = timeparms.to_initval;
696 server->retrans_count = timeparms.to_retries;
697
698 /* create transport and client */
699 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
700 if (IS_ERR(xprt)) {
701 dprintk("%s: cannot create RPC transport. Error = %ld\n",
702 __FUNCTION__, PTR_ERR(xprt));
703 return (struct rpc_clnt *)xprt;
704 }
705 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
706 server->rpc_ops->version, data->pseudoflavor);
707 if (IS_ERR(clnt)) {
708 dprintk("%s: cannot create RPC client. Error = %ld\n",
709 __FUNCTION__, PTR_ERR(xprt));
710 goto out_fail;
711 }
712
713 clnt->cl_intr = 1;
714 clnt->cl_softrtry = 1;
715
716 return clnt;
717
718 out_fail:
719 return clnt;
720 }
721
722 /*
723 * Clone a server record
724 */
725 static struct nfs_server *nfs_clone_server(struct super_block *sb, struct nfs_clone_mount *data)
726 {
727 struct nfs_server *server = NFS_SB(sb);
728 struct nfs_server *parent = NFS_SB(data->sb);
729 struct inode *root_inode;
730 struct nfs_fsinfo fsinfo;
731 void *err = ERR_PTR(-ENOMEM);
732
733 sb->s_op = data->sb->s_op;
734 sb->s_blocksize = data->sb->s_blocksize;
735 sb->s_blocksize_bits = data->sb->s_blocksize_bits;
736 sb->s_maxbytes = data->sb->s_maxbytes;
737
738 server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
739 server->io_stats = nfs_alloc_iostats();
740 if (server->io_stats == NULL)
741 goto out;
742
743 server->client = rpc_clone_client(parent->client);
744 if (IS_ERR((err = server->client)))
745 goto out;
746
747 if (!IS_ERR(parent->client_sys)) {
748 server->client_sys = rpc_clone_client(parent->client_sys);
749 if (IS_ERR((err = server->client_sys)))
750 goto out;
751 }
752 if (!IS_ERR(parent->client_acl)) {
753 server->client_acl = rpc_clone_client(parent->client_acl);
754 if (IS_ERR((err = server->client_acl)))
755 goto out;
756 }
757 root_inode = nfs_fhget(sb, data->fh, data->fattr);
758 if (!root_inode)
759 goto out;
760 sb->s_root = d_alloc_root(root_inode);
761 if (!sb->s_root)
762 goto out_put_root;
763 fsinfo.fattr = data->fattr;
764 if (NFS_PROTO(root_inode)->fsinfo(server, data->fh, &fsinfo) == 0)
765 nfs_super_set_maxbytes(sb, fsinfo.maxfilesize);
766 sb->s_root->d_op = server->rpc_ops->dentry_ops;
767 sb->s_flags |= MS_ACTIVE;
768 return server;
769 out_put_root:
770 iput(root_inode);
771 out:
772 return err;
773 }
774
775 /*
776 * Copy an existing superblock and attach revised data
777 */
778 static int nfs_clone_generic_sb(struct nfs_clone_mount *data,
779 struct super_block *(*fill_sb)(struct nfs_server *, struct nfs_clone_mount *),
780 struct nfs_server *(*fill_server)(struct super_block *, struct nfs_clone_mount *),
781 struct vfsmount *mnt)
782 {
783 struct nfs_server *server;
784 struct nfs_server *parent = NFS_SB(data->sb);
785 struct super_block *sb = ERR_PTR(-EINVAL);
786 char *hostname;
787 int error = -ENOMEM;
788 int len;
789
790 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
791 if (server == NULL)
792 goto out_err;
793 memcpy(server, parent, sizeof(*server));
794 hostname = (data->hostname != NULL) ? data->hostname : parent->hostname;
795 len = strlen(hostname) + 1;
796 server->hostname = kmalloc(len, GFP_KERNEL);
797 if (server->hostname == NULL)
798 goto free_server;
799 memcpy(server->hostname, hostname, len);
800 error = rpciod_up();
801 if (error != 0)
802 goto free_hostname;
803
804 sb = fill_sb(server, data);
805 if (IS_ERR(sb)) {
806 error = PTR_ERR(sb);
807 goto kill_rpciod;
808 }
809
810 if (sb->s_root)
811 goto out_rpciod_down;
812
813 server = fill_server(sb, data);
814 if (IS_ERR(server)) {
815 error = PTR_ERR(server);
816 goto out_deactivate;
817 }
818 return simple_set_mnt(mnt, sb);
819 out_deactivate:
820 up_write(&sb->s_umount);
821 deactivate_super(sb);
822 return error;
823 out_rpciod_down:
824 rpciod_down();
825 kfree(server->hostname);
826 kfree(server);
827 return simple_set_mnt(mnt, sb);
828 kill_rpciod:
829 rpciod_down();
830 free_hostname:
831 kfree(server->hostname);
832 free_server:
833 kfree(server);
834 out_err:
835 return error;
836 }
837
838 /*
839 * Set up an NFS2/3 superblock
840 *
841 * The way this works is that the mount process passes a structure
842 * in the data argument which contains the server's IP address
843 * and the root file handle obtained from the server's mount
844 * daemon. We stash these away in the private superblock fields.
845 */
846 static int
847 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
848 {
849 struct nfs_server *server;
850 rpc_authflavor_t authflavor;
851
852 server = NFS_SB(sb);
853 sb->s_blocksize_bits = 0;
854 sb->s_blocksize = 0;
855 if (data->bsize)
856 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
857 if (data->rsize)
858 server->rsize = nfs_block_size(data->rsize, NULL);
859 if (data->wsize)
860 server->wsize = nfs_block_size(data->wsize, NULL);
861 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
862
863 server->acregmin = data->acregmin*HZ;
864 server->acregmax = data->acregmax*HZ;
865 server->acdirmin = data->acdirmin*HZ;
866 server->acdirmax = data->acdirmax*HZ;
867
868 /* Start lockd here, before we might error out */
869 if (!(server->flags & NFS_MOUNT_NONLM))
870 lockd_up();
871
872 server->namelen = data->namlen;
873 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
874 if (!server->hostname)
875 return -ENOMEM;
876 strcpy(server->hostname, data->hostname);
877
878 /* Check NFS protocol revision and initialize RPC op vector
879 * and file handle pool. */
880 #ifdef CONFIG_NFS_V3
881 if (server->flags & NFS_MOUNT_VER3) {
882 server->rpc_ops = &nfs_v3_clientops;
883 server->caps |= NFS_CAP_READDIRPLUS;
884 } else {
885 server->rpc_ops = &nfs_v2_clientops;
886 }
887 #else
888 server->rpc_ops = &nfs_v2_clientops;
889 #endif
890
891 /* Fill in pseudoflavor for mount version < 5 */
892 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
893 data->pseudoflavor = RPC_AUTH_UNIX;
894 authflavor = data->pseudoflavor; /* save for sb_init() */
895 /* XXX maybe we want to add a server->pseudoflavor field */
896
897 /* Create RPC client handles */
898 server->client = nfs_create_client(server, data);
899 if (IS_ERR(server->client))
900 return PTR_ERR(server->client);
901 /* RFC 2623, sec 2.3.2 */
902 if (authflavor != RPC_AUTH_UNIX) {
903 struct rpc_auth *auth;
904
905 server->client_sys = rpc_clone_client(server->client);
906 if (IS_ERR(server->client_sys))
907 return PTR_ERR(server->client_sys);
908 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
909 if (IS_ERR(auth))
910 return PTR_ERR(auth);
911 } else {
912 atomic_inc(&server->client->cl_count);
913 server->client_sys = server->client;
914 }
915 if (server->flags & NFS_MOUNT_VER3) {
916 #ifdef CONFIG_NFS_V3_ACL
917 if (!(server->flags & NFS_MOUNT_NOACL)) {
918 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
919 /* No errors! Assume that Sun nfsacls are supported */
920 if (!IS_ERR(server->client_acl))
921 server->caps |= NFS_CAP_ACLS;
922 }
923 #else
924 server->flags &= ~NFS_MOUNT_NOACL;
925 #endif /* CONFIG_NFS_V3_ACL */
926 /*
927 * The VFS shouldn't apply the umask to mode bits. We will
928 * do so ourselves when necessary.
929 */
930 sb->s_flags |= MS_POSIXACL;
931 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
932 server->namelen = NFS3_MAXNAMLEN;
933 sb->s_time_gran = 1;
934 } else {
935 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
936 server->namelen = NFS2_MAXNAMLEN;
937 }
938
939 sb->s_op = &nfs_sops;
940 return nfs_sb_init(sb, authflavor);
941 }
942
943 static int nfs_set_super(struct super_block *s, void *data)
944 {
945 s->s_fs_info = data;
946 return set_anon_super(s, data);
947 }
948
949 static int nfs_compare_super(struct super_block *sb, void *data)
950 {
951 struct nfs_server *server = data;
952 struct nfs_server *old = NFS_SB(sb);
953
954 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
955 return 0;
956 if (old->addr.sin_port != server->addr.sin_port)
957 return 0;
958 return !nfs_compare_fh(&old->fh, &server->fh);
959 }
960
961 static int nfs_get_sb(struct file_system_type *fs_type,
962 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
963 {
964 int error;
965 struct nfs_server *server = NULL;
966 struct super_block *s;
967 struct nfs_fh *root;
968 struct nfs_mount_data *data = raw_data;
969
970 error = -EINVAL;
971 if (data == NULL) {
972 dprintk("%s: missing data argument\n", __FUNCTION__);
973 goto out_err_noserver;
974 }
975 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
976 dprintk("%s: bad mount version\n", __FUNCTION__);
977 goto out_err_noserver;
978 }
979 switch (data->version) {
980 case 1:
981 data->namlen = 0;
982 case 2:
983 data->bsize = 0;
984 case 3:
985 if (data->flags & NFS_MOUNT_VER3) {
986 dprintk("%s: mount structure version %d does not support NFSv3\n",
987 __FUNCTION__,
988 data->version);
989 goto out_err_noserver;
990 }
991 data->root.size = NFS2_FHSIZE;
992 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
993 case 4:
994 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
995 dprintk("%s: mount structure version %d does not support strong security\n",
996 __FUNCTION__,
997 data->version);
998 goto out_err_noserver;
999 }
1000 case 5:
1001 memset(data->context, 0, sizeof(data->context));
1002 }
1003 #ifndef CONFIG_NFS_V3
1004 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1005 error = -EPROTONOSUPPORT;
1006 if (data->flags & NFS_MOUNT_VER3) {
1007 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1008 goto out_err_noserver;
1009 }
1010 #endif /* CONFIG_NFS_V3 */
1011
1012 error = -ENOMEM;
1013 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1014 if (!server)
1015 goto out_err_noserver;
1016 /* Zero out the NFS state stuff */
1017 init_nfsv4_state(server);
1018 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1019
1020 root = &server->fh;
1021 if (data->flags & NFS_MOUNT_VER3)
1022 root->size = data->root.size;
1023 else
1024 root->size = NFS2_FHSIZE;
1025 error = -EINVAL;
1026 if (root->size > sizeof(root->data)) {
1027 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1028 goto out_err;
1029 }
1030 memcpy(root->data, data->root.data, root->size);
1031
1032 /* We now require that the mount process passes the remote address */
1033 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1034 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1035 dprintk("%s: mount program didn't pass remote address!\n",
1036 __FUNCTION__);
1037 goto out_err;
1038 }
1039
1040 /* Fire up rpciod if not yet running */
1041 error = rpciod_up();
1042 if (error < 0) {
1043 dprintk("%s: couldn't start rpciod! Error = %d\n",
1044 __FUNCTION__, error);
1045 goto out_err;
1046 }
1047
1048 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1049 if (IS_ERR(s)) {
1050 error = PTR_ERR(s);
1051 goto out_err_rpciod;
1052 }
1053
1054 if (s->s_root)
1055 goto out_rpciod_down;
1056
1057 s->s_flags = flags;
1058
1059 error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1060 if (error) {
1061 up_write(&s->s_umount);
1062 deactivate_super(s);
1063 return error;
1064 }
1065 s->s_flags |= MS_ACTIVE;
1066 return simple_set_mnt(mnt, s);
1067
1068 out_rpciod_down:
1069 rpciod_down();
1070 kfree(server);
1071 return simple_set_mnt(mnt, s);
1072
1073 out_err_rpciod:
1074 rpciod_down();
1075 out_err:
1076 kfree(server);
1077 out_err_noserver:
1078 return error;
1079 }
1080
1081 static void nfs_kill_super(struct super_block *s)
1082 {
1083 struct nfs_server *server = NFS_SB(s);
1084
1085 kill_anon_super(s);
1086
1087 if (!IS_ERR(server->client))
1088 rpc_shutdown_client(server->client);
1089 if (!IS_ERR(server->client_sys))
1090 rpc_shutdown_client(server->client_sys);
1091 if (!IS_ERR(server->client_acl))
1092 rpc_shutdown_client(server->client_acl);
1093
1094 if (!(server->flags & NFS_MOUNT_NONLM))
1095 lockd_down(); /* release rpc.lockd */
1096
1097 rpciod_down(); /* release rpciod */
1098
1099 nfs_free_iostats(server->io_stats);
1100 kfree(server->hostname);
1101 kfree(server);
1102 nfs_release_automount_timer();
1103 }
1104
1105 static struct super_block *nfs_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1106 {
1107 struct super_block *sb;
1108
1109 server->fsid = data->fattr->fsid;
1110 nfs_copy_fh(&server->fh, data->fh);
1111 sb = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
1112 if (!IS_ERR(sb) && sb->s_root == NULL && !(server->flags & NFS_MOUNT_NONLM))
1113 lockd_up();
1114 return sb;
1115 }
1116
1117 static int nfs_clone_nfs_sb(struct file_system_type *fs_type,
1118 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1119 {
1120 struct nfs_clone_mount *data = raw_data;
1121 return nfs_clone_generic_sb(data, nfs_clone_sb, nfs_clone_server, mnt);
1122 }
1123
1124 #ifdef CONFIG_NFS_V4
1125 static struct rpc_clnt *nfs4_create_client(struct nfs_server *server,
1126 struct rpc_timeout *timeparms, int proto, rpc_authflavor_t flavor)
1127 {
1128 struct nfs4_client *clp;
1129 struct rpc_xprt *xprt = NULL;
1130 struct rpc_clnt *clnt = NULL;
1131 int err = -EIO;
1132
1133 clp = nfs4_get_client(&server->addr.sin_addr);
1134 if (!clp) {
1135 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1136 return ERR_PTR(err);
1137 }
1138
1139 /* Now create transport and client */
1140 down_write(&clp->cl_sem);
1141 if (IS_ERR(clp->cl_rpcclient)) {
1142 xprt = xprt_create_proto(proto, &server->addr, timeparms);
1143 if (IS_ERR(xprt)) {
1144 up_write(&clp->cl_sem);
1145 err = PTR_ERR(xprt);
1146 dprintk("%s: cannot create RPC transport. Error = %d\n",
1147 __FUNCTION__, err);
1148 goto out_fail;
1149 }
1150 /* Bind to a reserved port! */
1151 xprt->resvport = 1;
1152 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1153 server->rpc_ops->version, flavor);
1154 if (IS_ERR(clnt)) {
1155 up_write(&clp->cl_sem);
1156 err = PTR_ERR(clnt);
1157 dprintk("%s: cannot create RPC client. Error = %d\n",
1158 __FUNCTION__, err);
1159 goto out_fail;
1160 }
1161 clnt->cl_intr = 1;
1162 clnt->cl_softrtry = 1;
1163 clp->cl_rpcclient = clnt;
1164 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1165 nfs_idmap_new(clp);
1166 }
1167 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1168 clnt = rpc_clone_client(clp->cl_rpcclient);
1169 if (!IS_ERR(clnt))
1170 server->nfs4_state = clp;
1171 up_write(&clp->cl_sem);
1172 clp = NULL;
1173
1174 if (IS_ERR(clnt)) {
1175 dprintk("%s: cannot create RPC client. Error = %d\n",
1176 __FUNCTION__, err);
1177 return clnt;
1178 }
1179
1180 if (server->nfs4_state->cl_idmap == NULL) {
1181 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1182 return ERR_PTR(-ENOMEM);
1183 }
1184
1185 if (clnt->cl_auth->au_flavor != flavor) {
1186 struct rpc_auth *auth;
1187
1188 auth = rpcauth_create(flavor, clnt);
1189 if (IS_ERR(auth)) {
1190 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1191 return (struct rpc_clnt *)auth;
1192 }
1193 }
1194 return clnt;
1195
1196 out_fail:
1197 if (clp)
1198 nfs4_put_client(clp);
1199 return ERR_PTR(err);
1200 }
1201
1202 /*
1203 * Set up an NFS4 superblock
1204 */
1205 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1206 {
1207 struct nfs_server *server;
1208 struct rpc_timeout timeparms;
1209 rpc_authflavor_t authflavour;
1210 int err = -EIO;
1211
1212 sb->s_blocksize_bits = 0;
1213 sb->s_blocksize = 0;
1214 server = NFS_SB(sb);
1215 if (data->rsize != 0)
1216 server->rsize = nfs_block_size(data->rsize, NULL);
1217 if (data->wsize != 0)
1218 server->wsize = nfs_block_size(data->wsize, NULL);
1219 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1220 server->caps = NFS_CAP_ATOMIC_OPEN;
1221
1222 server->acregmin = data->acregmin*HZ;
1223 server->acregmax = data->acregmax*HZ;
1224 server->acdirmin = data->acdirmin*HZ;
1225 server->acdirmax = data->acdirmax*HZ;
1226
1227 server->rpc_ops = &nfs_v4_clientops;
1228
1229 nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1230
1231 server->retrans_timeo = timeparms.to_initval;
1232 server->retrans_count = timeparms.to_retries;
1233
1234 /* Now create transport and client */
1235 authflavour = RPC_AUTH_UNIX;
1236 if (data->auth_flavourlen != 0) {
1237 if (data->auth_flavourlen != 1) {
1238 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1239 __FUNCTION__, data->auth_flavourlen);
1240 err = -EINVAL;
1241 goto out_fail;
1242 }
1243 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1244 err = -EFAULT;
1245 goto out_fail;
1246 }
1247 }
1248
1249 server->client = nfs4_create_client(server, &timeparms, data->proto, authflavour);
1250 if (IS_ERR(server->client)) {
1251 err = PTR_ERR(server->client);
1252 dprintk("%s: cannot create RPC client. Error = %d\n",
1253 __FUNCTION__, err);
1254 goto out_fail;
1255 }
1256
1257 sb->s_time_gran = 1;
1258
1259 sb->s_op = &nfs4_sops;
1260 err = nfs_sb_init(sb, authflavour);
1261
1262 out_fail:
1263 return err;
1264 }
1265
1266 static int nfs4_compare_super(struct super_block *sb, void *data)
1267 {
1268 struct nfs_server *server = data;
1269 struct nfs_server *old = NFS_SB(sb);
1270
1271 if (strcmp(server->hostname, old->hostname) != 0)
1272 return 0;
1273 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1274 return 0;
1275 return 1;
1276 }
1277
1278 static void *
1279 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1280 {
1281 void *p = NULL;
1282
1283 if (!src->len)
1284 return ERR_PTR(-EINVAL);
1285 if (src->len < maxlen)
1286 maxlen = src->len;
1287 if (dst == NULL) {
1288 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1289 if (p == NULL)
1290 return ERR_PTR(-ENOMEM);
1291 }
1292 if (copy_from_user(dst, src->data, maxlen)) {
1293 kfree(p);
1294 return ERR_PTR(-EFAULT);
1295 }
1296 dst[maxlen] = '\0';
1297 return dst;
1298 }
1299
1300 static int nfs4_get_sb(struct file_system_type *fs_type,
1301 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1302 {
1303 int error;
1304 struct nfs_server *server;
1305 struct super_block *s;
1306 struct nfs4_mount_data *data = raw_data;
1307 void *p;
1308
1309 if (data == NULL) {
1310 dprintk("%s: missing data argument\n", __FUNCTION__);
1311 return -EINVAL;
1312 }
1313 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1314 dprintk("%s: bad mount version\n", __FUNCTION__);
1315 return -EINVAL;
1316 }
1317
1318 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1319 if (!server)
1320 return -ENOMEM;
1321 /* Zero out the NFS state stuff */
1322 init_nfsv4_state(server);
1323 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1324
1325 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1326 if (IS_ERR(p))
1327 goto out_err;
1328 server->hostname = p;
1329
1330 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1331 if (IS_ERR(p))
1332 goto out_err;
1333 server->mnt_path = p;
1334
1335 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1336 sizeof(server->ip_addr) - 1);
1337 if (IS_ERR(p))
1338 goto out_err;
1339
1340 /* We now require that the mount process passes the remote address */
1341 if (data->host_addrlen != sizeof(server->addr)) {
1342 error = -EINVAL;
1343 goto out_free;
1344 }
1345 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1346 error = -EFAULT;
1347 goto out_free;
1348 }
1349 if (server->addr.sin_family != AF_INET ||
1350 server->addr.sin_addr.s_addr == INADDR_ANY) {
1351 dprintk("%s: mount program didn't pass remote IP address!\n",
1352 __FUNCTION__);
1353 error = -EINVAL;
1354 goto out_free;
1355 }
1356
1357 /* Fire up rpciod if not yet running */
1358 error = rpciod_up();
1359 if (error < 0) {
1360 dprintk("%s: couldn't start rpciod! Error = %d\n",
1361 __FUNCTION__, error);
1362 goto out_free;
1363 }
1364
1365 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1366
1367 if (IS_ERR(s)) {
1368 error = PTR_ERR(s);
1369 goto out_free;
1370 }
1371
1372 if (s->s_root) {
1373 kfree(server->mnt_path);
1374 kfree(server->hostname);
1375 kfree(server);
1376 return simple_set_mnt(mnt, s);
1377 }
1378
1379 s->s_flags = flags;
1380
1381 error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1382 if (error) {
1383 up_write(&s->s_umount);
1384 deactivate_super(s);
1385 return error;
1386 }
1387 s->s_flags |= MS_ACTIVE;
1388 return simple_set_mnt(mnt, s);
1389 out_err:
1390 error = PTR_ERR(p);
1391 out_free:
1392 kfree(server->mnt_path);
1393 kfree(server->hostname);
1394 kfree(server);
1395 return error;
1396 }
1397
1398 static void nfs4_kill_super(struct super_block *sb)
1399 {
1400 struct nfs_server *server = NFS_SB(sb);
1401
1402 nfs_return_all_delegations(sb);
1403 kill_anon_super(sb);
1404
1405 nfs4_renewd_prepare_shutdown(server);
1406
1407 if (server->client != NULL && !IS_ERR(server->client))
1408 rpc_shutdown_client(server->client);
1409
1410 destroy_nfsv4_state(server);
1411
1412 rpciod_down();
1413
1414 nfs_free_iostats(server->io_stats);
1415 kfree(server->hostname);
1416 kfree(server);
1417 nfs_release_automount_timer();
1418 }
1419
1420 /*
1421 * Constructs the SERVER-side path
1422 */
1423 static inline char *nfs4_dup_path(const struct dentry *dentry)
1424 {
1425 char *page = (char *) __get_free_page(GFP_USER);
1426 char *path;
1427
1428 path = nfs4_path(dentry, page, PAGE_SIZE);
1429 if (!IS_ERR(path)) {
1430 int len = PAGE_SIZE + page - path;
1431 char *tmp = path;
1432
1433 path = kmalloc(len, GFP_KERNEL);
1434 if (path)
1435 memcpy(path, tmp, len);
1436 else
1437 path = ERR_PTR(-ENOMEM);
1438 }
1439 free_page((unsigned long)page);
1440 return path;
1441 }
1442
1443 static struct super_block *nfs4_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1444 {
1445 const struct dentry *dentry = data->dentry;
1446 struct nfs4_client *clp = server->nfs4_state;
1447 struct super_block *sb;
1448
1449 server->fsid = data->fattr->fsid;
1450 nfs_copy_fh(&server->fh, data->fh);
1451 server->mnt_path = nfs4_dup_path(dentry);
1452 if (IS_ERR(server->mnt_path)) {
1453 sb = (struct super_block *)server->mnt_path;
1454 goto err;
1455 }
1456 sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server);
1457 if (IS_ERR(sb) || sb->s_root)
1458 goto free_path;
1459 nfs4_server_capabilities(server, &server->fh);
1460
1461 down_write(&clp->cl_sem);
1462 atomic_inc(&clp->cl_count);
1463 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1464 up_write(&clp->cl_sem);
1465 return sb;
1466 free_path:
1467 kfree(server->mnt_path);
1468 err:
1469 server->mnt_path = NULL;
1470 return sb;
1471 }
1472
1473 static int nfs_clone_nfs4_sb(struct file_system_type *fs_type,
1474 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1475 {
1476 struct nfs_clone_mount *data = raw_data;
1477 return nfs_clone_generic_sb(data, nfs4_clone_sb, nfs_clone_server, mnt);
1478 }
1479
1480 static struct super_block *nfs4_referral_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1481 {
1482 struct super_block *sb = ERR_PTR(-ENOMEM);
1483 int len;
1484
1485 len = strlen(data->mnt_path) + 1;
1486 server->mnt_path = kmalloc(len, GFP_KERNEL);
1487 if (server->mnt_path == NULL)
1488 goto err;
1489 memcpy(server->mnt_path, data->mnt_path, len);
1490 memcpy(&server->addr, data->addr, sizeof(struct sockaddr_in));
1491
1492 sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server);
1493 if (IS_ERR(sb) || sb->s_root)
1494 goto free_path;
1495 return sb;
1496 free_path:
1497 kfree(server->mnt_path);
1498 err:
1499 server->mnt_path = NULL;
1500 return sb;
1501 }
1502
1503 static struct nfs_server *nfs4_referral_server(struct super_block *sb, struct nfs_clone_mount *data)
1504 {
1505 struct nfs_server *server = NFS_SB(sb);
1506 struct rpc_timeout timeparms;
1507 int proto, timeo, retrans;
1508 void *err;
1509
1510 proto = IPPROTO_TCP;
1511 /* Since we are following a referral and there may be alternatives,
1512 set the timeouts and retries to low values */
1513 timeo = 2;
1514 retrans = 1;
1515 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
1516
1517 server->client = nfs4_create_client(server, &timeparms, proto, data->authflavor);
1518 if (IS_ERR((err = server->client)))
1519 goto out_err;
1520
1521 sb->s_time_gran = 1;
1522 sb->s_op = &nfs4_sops;
1523 err = ERR_PTR(nfs_sb_init(sb, data->authflavor));
1524 if (!IS_ERR(err))
1525 return server;
1526 out_err:
1527 return (struct nfs_server *)err;
1528 }
1529
1530 static int nfs_referral_nfs4_sb(struct file_system_type *fs_type,
1531 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1532 {
1533 struct nfs_clone_mount *data = raw_data;
1534 return nfs_clone_generic_sb(data, nfs4_referral_sb, nfs4_referral_server, mnt);
1535 }
1536
1537 #endif
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