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1/*
2 * Syscall interface to knfsd.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include <linux/slab.h>
8#include <linux/namei.h>
9#include <linux/ctype.h>
10
11#include <linux/sunrpc/svcsock.h>
12#include <linux/lockd/lockd.h>
13#include <linux/sunrpc/addr.h>
14#include <linux/sunrpc/gss_api.h>
15#include <linux/sunrpc/gss_krb5_enctypes.h>
16#include <linux/sunrpc/rpc_pipe_fs.h>
17#include <linux/module.h>
18
19#include "idmap.h"
20#include "nfsd.h"
21#include "cache.h"
22#include "state.h"
23#include "netns.h"
24
25/*
26 * We have a single directory with several nodes in it.
27 */
28enum {
29 NFSD_Root = 1,
30 NFSD_List,
31 NFSD_Export_features,
32 NFSD_Fh,
33 NFSD_FO_UnlockIP,
34 NFSD_FO_UnlockFS,
35 NFSD_Threads,
36 NFSD_Pool_Threads,
37 NFSD_Pool_Stats,
38 NFSD_Reply_Cache_Stats,
39 NFSD_Versions,
40 NFSD_Ports,
41 NFSD_MaxBlkSize,
42 NFSD_SupportedEnctypes,
43 /*
44 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
45 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
46 */
47#ifdef CONFIG_NFSD_V4
48 NFSD_Leasetime,
49 NFSD_Gracetime,
50 NFSD_RecoveryDir,
51#endif
52};
53
54/*
55 * write() for these nodes.
56 */
57static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
58static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
59static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
60static ssize_t write_threads(struct file *file, char *buf, size_t size);
61static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
62static ssize_t write_versions(struct file *file, char *buf, size_t size);
63static ssize_t write_ports(struct file *file, char *buf, size_t size);
64static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
65#ifdef CONFIG_NFSD_V4
66static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
67static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
68static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
69#endif
70
71static ssize_t (*write_op[])(struct file *, char *, size_t) = {
72 [NFSD_Fh] = write_filehandle,
73 [NFSD_FO_UnlockIP] = write_unlock_ip,
74 [NFSD_FO_UnlockFS] = write_unlock_fs,
75 [NFSD_Threads] = write_threads,
76 [NFSD_Pool_Threads] = write_pool_threads,
77 [NFSD_Versions] = write_versions,
78 [NFSD_Ports] = write_ports,
79 [NFSD_MaxBlkSize] = write_maxblksize,
80#ifdef CONFIG_NFSD_V4
81 [NFSD_Leasetime] = write_leasetime,
82 [NFSD_Gracetime] = write_gracetime,
83 [NFSD_RecoveryDir] = write_recoverydir,
84#endif
85};
86
87static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
88{
89 ino_t ino = file_inode(file)->i_ino;
90 char *data;
91 ssize_t rv;
92
93 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
94 return -EINVAL;
95
96 data = simple_transaction_get(file, buf, size);
97 if (IS_ERR(data))
98 return PTR_ERR(data);
99
100 rv = write_op[ino](file, data, size);
101 if (rv >= 0) {
102 simple_transaction_set(file, rv);
103 rv = size;
104 }
105 return rv;
106}
107
108static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
109{
110 if (! file->private_data) {
111 /* An attempt to read a transaction file without writing
112 * causes a 0-byte write so that the file can return
113 * state information
114 */
115 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
116 if (rv < 0)
117 return rv;
118 }
119 return simple_transaction_read(file, buf, size, pos);
120}
121
122static const struct file_operations transaction_ops = {
123 .write = nfsctl_transaction_write,
124 .read = nfsctl_transaction_read,
125 .release = simple_transaction_release,
126 .llseek = default_llseek,
127};
128
129static int exports_net_open(struct net *net, struct file *file)
130{
131 int err;
132 struct seq_file *seq;
133 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
134
135 err = seq_open(file, &nfs_exports_op);
136 if (err)
137 return err;
138
139 seq = file->private_data;
140 seq->private = nn->svc_export_cache;
141 return 0;
142}
143
144static int exports_proc_open(struct inode *inode, struct file *file)
145{
146 return exports_net_open(current->nsproxy->net_ns, file);
147}
148
149static const struct file_operations exports_proc_operations = {
150 .open = exports_proc_open,
151 .read = seq_read,
152 .llseek = seq_lseek,
153 .release = seq_release,
154 .owner = THIS_MODULE,
155};
156
157static int exports_nfsd_open(struct inode *inode, struct file *file)
158{
159 return exports_net_open(inode->i_sb->s_fs_info, file);
160}
161
162static const struct file_operations exports_nfsd_operations = {
163 .open = exports_nfsd_open,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = seq_release,
167 .owner = THIS_MODULE,
168};
169
170static int export_features_show(struct seq_file *m, void *v)
171{
172 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
173 return 0;
174}
175
176static int export_features_open(struct inode *inode, struct file *file)
177{
178 return single_open(file, export_features_show, NULL);
179}
180
181static const struct file_operations export_features_operations = {
182 .open = export_features_open,
183 .read = seq_read,
184 .llseek = seq_lseek,
185 .release = single_release,
186};
187
188#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
189static int supported_enctypes_show(struct seq_file *m, void *v)
190{
191 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
192 return 0;
193}
194
195static int supported_enctypes_open(struct inode *inode, struct file *file)
196{
197 return single_open(file, supported_enctypes_show, NULL);
198}
199
200static const struct file_operations supported_enctypes_ops = {
201 .open = supported_enctypes_open,
202 .read = seq_read,
203 .llseek = seq_lseek,
204 .release = single_release,
205};
206#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
207
208static const struct file_operations pool_stats_operations = {
209 .open = nfsd_pool_stats_open,
210 .read = seq_read,
211 .llseek = seq_lseek,
212 .release = nfsd_pool_stats_release,
213 .owner = THIS_MODULE,
214};
215
216static struct file_operations reply_cache_stats_operations = {
217 .open = nfsd_reply_cache_stats_open,
218 .read = seq_read,
219 .llseek = seq_lseek,
220 .release = single_release,
221};
222
223/*----------------------------------------------------------------------------*/
224/*
225 * payload - write methods
226 */
227
228
229/**
230 * write_unlock_ip - Release all locks used by a client
231 *
232 * Experimental.
233 *
234 * Input:
235 * buf: '\n'-terminated C string containing a
236 * presentation format IP address
237 * size: length of C string in @buf
238 * Output:
239 * On success: returns zero if all specified locks were released;
240 * returns one if one or more locks were not released
241 * On error: return code is negative errno value
242 */
243static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
244{
245 struct sockaddr_storage address;
246 struct sockaddr *sap = (struct sockaddr *)&address;
247 size_t salen = sizeof(address);
248 char *fo_path;
249 struct net *net = file->f_dentry->d_sb->s_fs_info;
250
251 /* sanity check */
252 if (size == 0)
253 return -EINVAL;
254
255 if (buf[size-1] != '\n')
256 return -EINVAL;
257
258 fo_path = buf;
259 if (qword_get(&buf, fo_path, size) < 0)
260 return -EINVAL;
261
262 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
263 return -EINVAL;
264
265 return nlmsvc_unlock_all_by_ip(sap);
266}
267
268/**
269 * write_unlock_fs - Release all locks on a local file system
270 *
271 * Experimental.
272 *
273 * Input:
274 * buf: '\n'-terminated C string containing the
275 * absolute pathname of a local file system
276 * size: length of C string in @buf
277 * Output:
278 * On success: returns zero if all specified locks were released;
279 * returns one if one or more locks were not released
280 * On error: return code is negative errno value
281 */
282static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
283{
284 struct path path;
285 char *fo_path;
286 int error;
287
288 /* sanity check */
289 if (size == 0)
290 return -EINVAL;
291
292 if (buf[size-1] != '\n')
293 return -EINVAL;
294
295 fo_path = buf;
296 if (qword_get(&buf, fo_path, size) < 0)
297 return -EINVAL;
298
299 error = kern_path(fo_path, 0, &path);
300 if (error)
301 return error;
302
303 /*
304 * XXX: Needs better sanity checking. Otherwise we could end up
305 * releasing locks on the wrong file system.
306 *
307 * For example:
308 * 1. Does the path refer to a directory?
309 * 2. Is that directory a mount point, or
310 * 3. Is that directory the root of an exported file system?
311 */
312 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
313
314 path_put(&path);
315 return error;
316}
317
318/**
319 * write_filehandle - Get a variable-length NFS file handle by path
320 *
321 * On input, the buffer contains a '\n'-terminated C string comprised of
322 * three alphanumeric words separated by whitespace. The string may
323 * contain escape sequences.
324 *
325 * Input:
326 * buf:
327 * domain: client domain name
328 * path: export pathname
329 * maxsize: numeric maximum size of
330 * @buf
331 * size: length of C string in @buf
332 * Output:
333 * On success: passed-in buffer filled with '\n'-terminated C
334 * string containing a ASCII hex text version
335 * of the NFS file handle;
336 * return code is the size in bytes of the string
337 * On error: return code is negative errno value
338 */
339static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
340{
341 char *dname, *path;
342 int uninitialized_var(maxsize);
343 char *mesg = buf;
344 int len;
345 struct auth_domain *dom;
346 struct knfsd_fh fh;
347 struct net *net = file->f_dentry->d_sb->s_fs_info;
348
349 if (size == 0)
350 return -EINVAL;
351
352 if (buf[size-1] != '\n')
353 return -EINVAL;
354 buf[size-1] = 0;
355
356 dname = mesg;
357 len = qword_get(&mesg, dname, size);
358 if (len <= 0)
359 return -EINVAL;
360
361 path = dname+len+1;
362 len = qword_get(&mesg, path, size);
363 if (len <= 0)
364 return -EINVAL;
365
366 len = get_int(&mesg, &maxsize);
367 if (len)
368 return len;
369
370 if (maxsize < NFS_FHSIZE)
371 return -EINVAL;
372 if (maxsize > NFS3_FHSIZE)
373 maxsize = NFS3_FHSIZE;
374
375 if (qword_get(&mesg, mesg, size)>0)
376 return -EINVAL;
377
378 /* we have all the words, they are in buf.. */
379 dom = unix_domain_find(dname);
380 if (!dom)
381 return -ENOMEM;
382
383 len = exp_rootfh(net, dom, path, &fh, maxsize);
384 auth_domain_put(dom);
385 if (len)
386 return len;
387
388 mesg = buf;
389 len = SIMPLE_TRANSACTION_LIMIT;
390 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
391 mesg[-1] = '\n';
392 return mesg - buf;
393}
394
395/**
396 * write_threads - Start NFSD, or report the current number of running threads
397 *
398 * Input:
399 * buf: ignored
400 * size: zero
401 * Output:
402 * On success: passed-in buffer filled with '\n'-terminated C
403 * string numeric value representing the number of
404 * running NFSD threads;
405 * return code is the size in bytes of the string
406 * On error: return code is zero
407 *
408 * OR
409 *
410 * Input:
411 * buf: C string containing an unsigned
412 * integer value representing the
413 * number of NFSD threads to start
414 * size: non-zero length of C string in @buf
415 * Output:
416 * On success: NFS service is started;
417 * passed-in buffer filled with '\n'-terminated C
418 * string numeric value representing the number of
419 * running NFSD threads;
420 * return code is the size in bytes of the string
421 * On error: return code is zero or a negative errno value
422 */
423static ssize_t write_threads(struct file *file, char *buf, size_t size)
424{
425 char *mesg = buf;
426 int rv;
427 struct net *net = file->f_dentry->d_sb->s_fs_info;
428
429 if (size > 0) {
430 int newthreads;
431 rv = get_int(&mesg, &newthreads);
432 if (rv)
433 return rv;
434 if (newthreads < 0)
435 return -EINVAL;
436 rv = nfsd_svc(newthreads, net);
437 if (rv < 0)
438 return rv;
439 } else
440 rv = nfsd_nrthreads(net);
441
442 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
443}
444
445/**
446 * write_pool_threads - Set or report the current number of threads per pool
447 *
448 * Input:
449 * buf: ignored
450 * size: zero
451 *
452 * OR
453 *
454 * Input:
455 * buf: C string containing whitespace-
456 * separated unsigned integer values
457 * representing the number of NFSD
458 * threads to start in each pool
459 * size: non-zero length of C string in @buf
460 * Output:
461 * On success: passed-in buffer filled with '\n'-terminated C
462 * string containing integer values representing the
463 * number of NFSD threads in each pool;
464 * return code is the size in bytes of the string
465 * On error: return code is zero or a negative errno value
466 */
467static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
468{
469 /* if size > 0, look for an array of number of threads per node
470 * and apply them then write out number of threads per node as reply
471 */
472 char *mesg = buf;
473 int i;
474 int rv;
475 int len;
476 int npools;
477 int *nthreads;
478 struct net *net = file->f_dentry->d_sb->s_fs_info;
479
480 mutex_lock(&nfsd_mutex);
481 npools = nfsd_nrpools(net);
482 if (npools == 0) {
483 /*
484 * NFS is shut down. The admin can start it by
485 * writing to the threads file but NOT the pool_threads
486 * file, sorry. Report zero threads.
487 */
488 mutex_unlock(&nfsd_mutex);
489 strcpy(buf, "0\n");
490 return strlen(buf);
491 }
492
493 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
494 rv = -ENOMEM;
495 if (nthreads == NULL)
496 goto out_free;
497
498 if (size > 0) {
499 for (i = 0; i < npools; i++) {
500 rv = get_int(&mesg, &nthreads[i]);
501 if (rv == -ENOENT)
502 break; /* fewer numbers than pools */
503 if (rv)
504 goto out_free; /* syntax error */
505 rv = -EINVAL;
506 if (nthreads[i] < 0)
507 goto out_free;
508 }
509 rv = nfsd_set_nrthreads(i, nthreads, net);
510 if (rv)
511 goto out_free;
512 }
513
514 rv = nfsd_get_nrthreads(npools, nthreads, net);
515 if (rv)
516 goto out_free;
517
518 mesg = buf;
519 size = SIMPLE_TRANSACTION_LIMIT;
520 for (i = 0; i < npools && size > 0; i++) {
521 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
522 len = strlen(mesg);
523 size -= len;
524 mesg += len;
525 }
526 rv = mesg - buf;
527out_free:
528 kfree(nthreads);
529 mutex_unlock(&nfsd_mutex);
530 return rv;
531}
532
533static ssize_t __write_versions(struct file *file, char *buf, size_t size)
534{
535 char *mesg = buf;
536 char *vers, *minorp, sign;
537 int len, num, remaining;
538 unsigned minor;
539 ssize_t tlen = 0;
540 char *sep;
541 struct net *net = file->f_dentry->d_sb->s_fs_info;
542 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
543
544 if (size>0) {
545 if (nn->nfsd_serv)
546 /* Cannot change versions without updating
547 * nn->nfsd_serv->sv_xdrsize, and reallocing
548 * rq_argp and rq_resp
549 */
550 return -EBUSY;
551 if (buf[size-1] != '\n')
552 return -EINVAL;
553 buf[size-1] = 0;
554
555 vers = mesg;
556 len = qword_get(&mesg, vers, size);
557 if (len <= 0) return -EINVAL;
558 do {
559 sign = *vers;
560 if (sign == '+' || sign == '-')
561 num = simple_strtol((vers+1), &minorp, 0);
562 else
563 num = simple_strtol(vers, &minorp, 0);
564 if (*minorp == '.') {
565 if (num != 4)
566 return -EINVAL;
567 minor = simple_strtoul(minorp+1, NULL, 0);
568 if (minor == 0)
569 return -EINVAL;
570 if (nfsd_minorversion(minor, sign == '-' ?
571 NFSD_CLEAR : NFSD_SET) < 0)
572 return -EINVAL;
573 goto next;
574 }
575 switch(num) {
576 case 2:
577 case 3:
578 case 4:
579 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
580 break;
581 default:
582 return -EINVAL;
583 }
584 next:
585 vers += len + 1;
586 } while ((len = qword_get(&mesg, vers, size)) > 0);
587 /* If all get turned off, turn them back on, as
588 * having no versions is BAD
589 */
590 nfsd_reset_versions();
591 }
592
593 /* Now write current state into reply buffer */
594 len = 0;
595 sep = "";
596 remaining = SIMPLE_TRANSACTION_LIMIT;
597 for (num=2 ; num <= 4 ; num++)
598 if (nfsd_vers(num, NFSD_AVAIL)) {
599 len = snprintf(buf, remaining, "%s%c%d", sep,
600 nfsd_vers(num, NFSD_TEST)?'+':'-',
601 num);
602 sep = " ";
603
604 if (len > remaining)
605 break;
606 remaining -= len;
607 buf += len;
608 tlen += len;
609 }
610 if (nfsd_vers(4, NFSD_AVAIL))
611 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
612 minor++) {
613 len = snprintf(buf, remaining, " %c4.%u",
614 (nfsd_vers(4, NFSD_TEST) &&
615 nfsd_minorversion(minor, NFSD_TEST)) ?
616 '+' : '-',
617 minor);
618
619 if (len > remaining)
620 break;
621 remaining -= len;
622 buf += len;
623 tlen += len;
624 }
625
626 len = snprintf(buf, remaining, "\n");
627 if (len > remaining)
628 return -EINVAL;
629 return tlen + len;
630}
631
632/**
633 * write_versions - Set or report the available NFS protocol versions
634 *
635 * Input:
636 * buf: ignored
637 * size: zero
638 * Output:
639 * On success: passed-in buffer filled with '\n'-terminated C
640 * string containing positive or negative integer
641 * values representing the current status of each
642 * protocol version;
643 * return code is the size in bytes of the string
644 * On error: return code is zero or a negative errno value
645 *
646 * OR
647 *
648 * Input:
649 * buf: C string containing whitespace-
650 * separated positive or negative
651 * integer values representing NFS
652 * protocol versions to enable ("+n")
653 * or disable ("-n")
654 * size: non-zero length of C string in @buf
655 * Output:
656 * On success: status of zero or more protocol versions has
657 * been updated; passed-in buffer filled with
658 * '\n'-terminated C string containing positive
659 * or negative integer values representing the
660 * current status of each protocol version;
661 * return code is the size in bytes of the string
662 * On error: return code is zero or a negative errno value
663 */
664static ssize_t write_versions(struct file *file, char *buf, size_t size)
665{
666 ssize_t rv;
667
668 mutex_lock(&nfsd_mutex);
669 rv = __write_versions(file, buf, size);
670 mutex_unlock(&nfsd_mutex);
671 return rv;
672}
673
674/*
675 * Zero-length write. Return a list of NFSD's current listener
676 * transports.
677 */
678static ssize_t __write_ports_names(char *buf, struct net *net)
679{
680 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
681
682 if (nn->nfsd_serv == NULL)
683 return 0;
684 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
685}
686
687/*
688 * A single 'fd' number was written, in which case it must be for
689 * a socket of a supported family/protocol, and we use it as an
690 * nfsd listener.
691 */
692static ssize_t __write_ports_addfd(char *buf, struct net *net)
693{
694 char *mesg = buf;
695 int fd, err;
696 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
697
698 err = get_int(&mesg, &fd);
699 if (err != 0 || fd < 0)
700 return -EINVAL;
701
702 if (svc_alien_sock(net, fd)) {
703 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
704 return -EINVAL;
705 }
706
707 err = nfsd_create_serv(net);
708 if (err != 0)
709 return err;
710
711 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
712 if (err < 0) {
713 nfsd_destroy(net);
714 return err;
715 }
716
717 /* Decrease the count, but don't shut down the service */
718 nn->nfsd_serv->sv_nrthreads--;
719 return err;
720}
721
722/*
723 * A transport listener is added by writing it's transport name and
724 * a port number.
725 */
726static ssize_t __write_ports_addxprt(char *buf, struct net *net)
727{
728 char transport[16];
729 struct svc_xprt *xprt;
730 int port, err;
731 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
732
733 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
734 return -EINVAL;
735
736 if (port < 1 || port > USHRT_MAX)
737 return -EINVAL;
738
739 err = nfsd_create_serv(net);
740 if (err != 0)
741 return err;
742
743 err = svc_create_xprt(nn->nfsd_serv, transport, net,
744 PF_INET, port, SVC_SOCK_ANONYMOUS);
745 if (err < 0)
746 goto out_err;
747
748 err = svc_create_xprt(nn->nfsd_serv, transport, net,
749 PF_INET6, port, SVC_SOCK_ANONYMOUS);
750 if (err < 0 && err != -EAFNOSUPPORT)
751 goto out_close;
752
753 /* Decrease the count, but don't shut down the service */
754 nn->nfsd_serv->sv_nrthreads--;
755 return 0;
756out_close:
757 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
758 if (xprt != NULL) {
759 svc_close_xprt(xprt);
760 svc_xprt_put(xprt);
761 }
762out_err:
763 nfsd_destroy(net);
764 return err;
765}
766
767static ssize_t __write_ports(struct file *file, char *buf, size_t size,
768 struct net *net)
769{
770 if (size == 0)
771 return __write_ports_names(buf, net);
772
773 if (isdigit(buf[0]))
774 return __write_ports_addfd(buf, net);
775
776 if (isalpha(buf[0]))
777 return __write_ports_addxprt(buf, net);
778
779 return -EINVAL;
780}
781
782/**
783 * write_ports - Pass a socket file descriptor or transport name to listen on
784 *
785 * Input:
786 * buf: ignored
787 * size: zero
788 * Output:
789 * On success: passed-in buffer filled with a '\n'-terminated C
790 * string containing a whitespace-separated list of
791 * named NFSD listeners;
792 * return code is the size in bytes of the string
793 * On error: return code is zero or a negative errno value
794 *
795 * OR
796 *
797 * Input:
798 * buf: C string containing an unsigned
799 * integer value representing a bound
800 * but unconnected socket that is to be
801 * used as an NFSD listener; listen(3)
802 * must be called for a SOCK_STREAM
803 * socket, otherwise it is ignored
804 * size: non-zero length of C string in @buf
805 * Output:
806 * On success: NFS service is started;
807 * passed-in buffer filled with a '\n'-terminated C
808 * string containing a unique alphanumeric name of
809 * the listener;
810 * return code is the size in bytes of the string
811 * On error: return code is a negative errno value
812 *
813 * OR
814 *
815 * Input:
816 * buf: C string containing a transport
817 * name and an unsigned integer value
818 * representing the port to listen on,
819 * separated by whitespace
820 * size: non-zero length of C string in @buf
821 * Output:
822 * On success: returns zero; NFS service is started
823 * On error: return code is a negative errno value
824 */
825static ssize_t write_ports(struct file *file, char *buf, size_t size)
826{
827 ssize_t rv;
828 struct net *net = file->f_dentry->d_sb->s_fs_info;
829
830 mutex_lock(&nfsd_mutex);
831 rv = __write_ports(file, buf, size, net);
832 mutex_unlock(&nfsd_mutex);
833 return rv;
834}
835
836
837int nfsd_max_blksize;
838
839/**
840 * write_maxblksize - Set or report the current NFS blksize
841 *
842 * Input:
843 * buf: ignored
844 * size: zero
845 *
846 * OR
847 *
848 * Input:
849 * buf: C string containing an unsigned
850 * integer value representing the new
851 * NFS blksize
852 * size: non-zero length of C string in @buf
853 * Output:
854 * On success: passed-in buffer filled with '\n'-terminated C string
855 * containing numeric value of the current NFS blksize
856 * setting;
857 * return code is the size in bytes of the string
858 * On error: return code is zero or a negative errno value
859 */
860static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
861{
862 char *mesg = buf;
863 struct net *net = file->f_dentry->d_sb->s_fs_info;
864 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
865
866 if (size > 0) {
867 int bsize;
868 int rv = get_int(&mesg, &bsize);
869 if (rv)
870 return rv;
871 /* force bsize into allowed range and
872 * required alignment.
873 */
874 if (bsize < 1024)
875 bsize = 1024;
876 if (bsize > NFSSVC_MAXBLKSIZE)
877 bsize = NFSSVC_MAXBLKSIZE;
878 bsize &= ~(1024-1);
879 mutex_lock(&nfsd_mutex);
880 if (nn->nfsd_serv) {
881 mutex_unlock(&nfsd_mutex);
882 return -EBUSY;
883 }
884 nfsd_max_blksize = bsize;
885 mutex_unlock(&nfsd_mutex);
886 }
887
888 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
889 nfsd_max_blksize);
890}
891
892#ifdef CONFIG_NFSD_V4
893static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
894 time_t *time, struct nfsd_net *nn)
895{
896 char *mesg = buf;
897 int rv, i;
898
899 if (size > 0) {
900 if (nn->nfsd_serv)
901 return -EBUSY;
902 rv = get_int(&mesg, &i);
903 if (rv)
904 return rv;
905 /*
906 * Some sanity checking. We don't have a reason for
907 * these particular numbers, but problems with the
908 * extremes are:
909 * - Too short: the briefest network outage may
910 * cause clients to lose all their locks. Also,
911 * the frequent polling may be wasteful.
912 * - Too long: do you really want reboot recovery
913 * to take more than an hour? Or to make other
914 * clients wait an hour before being able to
915 * revoke a dead client's locks?
916 */
917 if (i < 10 || i > 3600)
918 return -EINVAL;
919 *time = i;
920 }
921
922 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
923}
924
925static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
926 time_t *time, struct nfsd_net *nn)
927{
928 ssize_t rv;
929
930 mutex_lock(&nfsd_mutex);
931 rv = __nfsd4_write_time(file, buf, size, time, nn);
932 mutex_unlock(&nfsd_mutex);
933 return rv;
934}
935
936/**
937 * write_leasetime - Set or report the current NFSv4 lease time
938 *
939 * Input:
940 * buf: ignored
941 * size: zero
942 *
943 * OR
944 *
945 * Input:
946 * buf: C string containing an unsigned
947 * integer value representing the new
948 * NFSv4 lease expiry time
949 * size: non-zero length of C string in @buf
950 * Output:
951 * On success: passed-in buffer filled with '\n'-terminated C
952 * string containing unsigned integer value of the
953 * current lease expiry time;
954 * return code is the size in bytes of the string
955 * On error: return code is zero or a negative errno value
956 */
957static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
958{
959 struct net *net = file->f_dentry->d_sb->s_fs_info;
960 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
961 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
962}
963
964/**
965 * write_gracetime - Set or report current NFSv4 grace period time
966 *
967 * As above, but sets the time of the NFSv4 grace period.
968 *
969 * Note this should never be set to less than the *previous*
970 * lease-period time, but we don't try to enforce this. (In the common
971 * case (a new boot), we don't know what the previous lease time was
972 * anyway.)
973 */
974static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
975{
976 struct net *net = file->f_dentry->d_sb->s_fs_info;
977 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
978 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
979}
980
981static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
982 struct nfsd_net *nn)
983{
984 char *mesg = buf;
985 char *recdir;
986 int len, status;
987
988 if (size > 0) {
989 if (nn->nfsd_serv)
990 return -EBUSY;
991 if (size > PATH_MAX || buf[size-1] != '\n')
992 return -EINVAL;
993 buf[size-1] = 0;
994
995 recdir = mesg;
996 len = qword_get(&mesg, recdir, size);
997 if (len <= 0)
998 return -EINVAL;
999
1000 status = nfs4_reset_recoverydir(recdir);
1001 if (status)
1002 return status;
1003 }
1004
1005 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1006 nfs4_recoverydir());
1007}
1008
1009/**
1010 * write_recoverydir - Set or report the pathname of the recovery directory
1011 *
1012 * Input:
1013 * buf: ignored
1014 * size: zero
1015 *
1016 * OR
1017 *
1018 * Input:
1019 * buf: C string containing the pathname
1020 * of the directory on a local file
1021 * system containing permanent NFSv4
1022 * recovery data
1023 * size: non-zero length of C string in @buf
1024 * Output:
1025 * On success: passed-in buffer filled with '\n'-terminated C string
1026 * containing the current recovery pathname setting;
1027 * return code is the size in bytes of the string
1028 * On error: return code is zero or a negative errno value
1029 */
1030static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1031{
1032 ssize_t rv;
1033 struct net *net = file->f_dentry->d_sb->s_fs_info;
1034 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1035
1036 mutex_lock(&nfsd_mutex);
1037 rv = __write_recoverydir(file, buf, size, nn);
1038 mutex_unlock(&nfsd_mutex);
1039 return rv;
1040}
1041
1042#endif
1043
1044/*----------------------------------------------------------------------------*/
1045/*
1046 * populating the filesystem.
1047 */
1048
1049static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1050{
1051 static struct tree_descr nfsd_files[] = {
1052 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1053 [NFSD_Export_features] = {"export_features",
1054 &export_features_operations, S_IRUGO},
1055 [NFSD_FO_UnlockIP] = {"unlock_ip",
1056 &transaction_ops, S_IWUSR|S_IRUSR},
1057 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1058 &transaction_ops, S_IWUSR|S_IRUSR},
1059 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1060 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1061 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1062 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1063 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1064 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1065 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1066 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1067#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1068 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1069#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1070#ifdef CONFIG_NFSD_V4
1071 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1072 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1073 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1074#endif
1075 /* last one */ {""}
1076 };
1077 struct net *net = data;
1078 int ret;
1079
1080 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1081 if (ret)
1082 return ret;
1083 sb->s_fs_info = get_net(net);
1084 return 0;
1085}
1086
1087static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1088 int flags, const char *dev_name, void *data)
1089{
1090 return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1091}
1092
1093static void nfsd_umount(struct super_block *sb)
1094{
1095 struct net *net = sb->s_fs_info;
1096
1097 kill_litter_super(sb);
1098 put_net(net);
1099}
1100
1101static struct file_system_type nfsd_fs_type = {
1102 .owner = THIS_MODULE,
1103 .name = "nfsd",
1104 .mount = nfsd_mount,
1105 .kill_sb = nfsd_umount,
1106};
1107MODULE_ALIAS_FS("nfsd");
1108
1109#ifdef CONFIG_PROC_FS
1110static int create_proc_exports_entry(void)
1111{
1112 struct proc_dir_entry *entry;
1113
1114 entry = proc_mkdir("fs/nfs", NULL);
1115 if (!entry)
1116 return -ENOMEM;
1117 entry = proc_create("exports", 0, entry,
1118 &exports_proc_operations);
1119 if (!entry) {
1120 remove_proc_entry("fs/nfs", NULL);
1121 return -ENOMEM;
1122 }
1123 return 0;
1124}
1125#else /* CONFIG_PROC_FS */
1126static int create_proc_exports_entry(void)
1127{
1128 return 0;
1129}
1130#endif
1131
1132int nfsd_net_id;
1133
1134static __net_init int nfsd_init_net(struct net *net)
1135{
1136 int retval;
1137 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1138
1139 retval = nfsd_export_init(net);
1140 if (retval)
1141 goto out_export_error;
1142 retval = nfsd_idmap_init(net);
1143 if (retval)
1144 goto out_idmap_error;
1145 nn->nfsd4_lease = 90; /* default lease time */
1146 nn->nfsd4_grace = 90;
1147 return 0;
1148
1149out_idmap_error:
1150 nfsd_export_shutdown(net);
1151out_export_error:
1152 return retval;
1153}
1154
1155static __net_exit void nfsd_exit_net(struct net *net)
1156{
1157 nfsd_idmap_shutdown(net);
1158 nfsd_export_shutdown(net);
1159}
1160
1161static struct pernet_operations nfsd_net_ops = {
1162 .init = nfsd_init_net,
1163 .exit = nfsd_exit_net,
1164 .id = &nfsd_net_id,
1165 .size = sizeof(struct nfsd_net),
1166};
1167
1168static int __init init_nfsd(void)
1169{
1170 int retval;
1171 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1172
1173 retval = register_cld_notifier();
1174 if (retval)
1175 return retval;
1176 retval = register_pernet_subsys(&nfsd_net_ops);
1177 if (retval < 0)
1178 goto out_unregister_notifier;
1179 retval = nfsd4_init_slabs();
1180 if (retval)
1181 goto out_unregister_pernet;
1182 nfs4_state_init();
1183 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1184 if (retval)
1185 goto out_free_slabs;
1186 nfsd_stat_init(); /* Statistics */
1187 retval = nfsd_reply_cache_init();
1188 if (retval)
1189 goto out_free_stat;
1190 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1191 retval = create_proc_exports_entry();
1192 if (retval)
1193 goto out_free_lockd;
1194 retval = register_filesystem(&nfsd_fs_type);
1195 if (retval)
1196 goto out_free_all;
1197 return 0;
1198out_free_all:
1199 remove_proc_entry("fs/nfs/exports", NULL);
1200 remove_proc_entry("fs/nfs", NULL);
1201out_free_lockd:
1202 nfsd_lockd_shutdown();
1203 nfsd_reply_cache_shutdown();
1204out_free_stat:
1205 nfsd_stat_shutdown();
1206 nfsd_fault_inject_cleanup();
1207out_free_slabs:
1208 nfsd4_free_slabs();
1209out_unregister_pernet:
1210 unregister_pernet_subsys(&nfsd_net_ops);
1211out_unregister_notifier:
1212 unregister_cld_notifier();
1213 return retval;
1214}
1215
1216static void __exit exit_nfsd(void)
1217{
1218 nfsd_reply_cache_shutdown();
1219 remove_proc_entry("fs/nfs/exports", NULL);
1220 remove_proc_entry("fs/nfs", NULL);
1221 nfsd_stat_shutdown();
1222 nfsd_lockd_shutdown();
1223 nfsd4_free_slabs();
1224 nfsd_fault_inject_cleanup();
1225 unregister_filesystem(&nfsd_fs_type);
1226 unregister_pernet_subsys(&nfsd_net_ops);
1227 unregister_cld_notifier();
1228}
1229
1230MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1231MODULE_LICENSE("GPL");
1232module_init(init_nfsd)
1233module_exit(exit_nfsd)
1/*
2 * Syscall interface to knfsd.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include <linux/slab.h>
8#include <linux/namei.h>
9#include <linux/ctype.h>
10
11#include <linux/sunrpc/svcsock.h>
12#include <linux/nfsd/syscall.h>
13#include <linux/lockd/lockd.h>
14#include <linux/sunrpc/clnt.h>
15#include <linux/sunrpc/gss_api.h>
16#include <linux/sunrpc/gss_krb5_enctypes.h>
17
18#include "idmap.h"
19#include "nfsd.h"
20#include "cache.h"
21
22/*
23 * We have a single directory with several nodes in it.
24 */
25enum {
26 NFSD_Root = 1,
27 NFSD_List,
28 NFSD_Export_features,
29 NFSD_Fh,
30 NFSD_FO_UnlockIP,
31 NFSD_FO_UnlockFS,
32 NFSD_Threads,
33 NFSD_Pool_Threads,
34 NFSD_Pool_Stats,
35 NFSD_Versions,
36 NFSD_Ports,
37 NFSD_MaxBlkSize,
38 NFSD_SupportedEnctypes,
39 /*
40 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
41 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
42 */
43#ifdef CONFIG_NFSD_V4
44 NFSD_Leasetime,
45 NFSD_Gracetime,
46 NFSD_RecoveryDir,
47#endif
48};
49
50/*
51 * write() for these nodes.
52 */
53static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
54static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
55static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
56static ssize_t write_threads(struct file *file, char *buf, size_t size);
57static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
58static ssize_t write_versions(struct file *file, char *buf, size_t size);
59static ssize_t write_ports(struct file *file, char *buf, size_t size);
60static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
61#ifdef CONFIG_NFSD_V4
62static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
63static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
64static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
65#endif
66
67static ssize_t (*write_op[])(struct file *, char *, size_t) = {
68 [NFSD_Fh] = write_filehandle,
69 [NFSD_FO_UnlockIP] = write_unlock_ip,
70 [NFSD_FO_UnlockFS] = write_unlock_fs,
71 [NFSD_Threads] = write_threads,
72 [NFSD_Pool_Threads] = write_pool_threads,
73 [NFSD_Versions] = write_versions,
74 [NFSD_Ports] = write_ports,
75 [NFSD_MaxBlkSize] = write_maxblksize,
76#ifdef CONFIG_NFSD_V4
77 [NFSD_Leasetime] = write_leasetime,
78 [NFSD_Gracetime] = write_gracetime,
79 [NFSD_RecoveryDir] = write_recoverydir,
80#endif
81};
82
83static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
84{
85 ino_t ino = file->f_path.dentry->d_inode->i_ino;
86 char *data;
87 ssize_t rv;
88
89 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
90 return -EINVAL;
91
92 data = simple_transaction_get(file, buf, size);
93 if (IS_ERR(data))
94 return PTR_ERR(data);
95
96 rv = write_op[ino](file, data, size);
97 if (rv >= 0) {
98 simple_transaction_set(file, rv);
99 rv = size;
100 }
101 return rv;
102}
103
104static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
105{
106 if (! file->private_data) {
107 /* An attempt to read a transaction file without writing
108 * causes a 0-byte write so that the file can return
109 * state information
110 */
111 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
112 if (rv < 0)
113 return rv;
114 }
115 return simple_transaction_read(file, buf, size, pos);
116}
117
118static const struct file_operations transaction_ops = {
119 .write = nfsctl_transaction_write,
120 .read = nfsctl_transaction_read,
121 .release = simple_transaction_release,
122 .llseek = default_llseek,
123};
124
125static int exports_open(struct inode *inode, struct file *file)
126{
127 return seq_open(file, &nfs_exports_op);
128}
129
130static const struct file_operations exports_operations = {
131 .open = exports_open,
132 .read = seq_read,
133 .llseek = seq_lseek,
134 .release = seq_release,
135 .owner = THIS_MODULE,
136};
137
138static int export_features_show(struct seq_file *m, void *v)
139{
140 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
141 return 0;
142}
143
144static int export_features_open(struct inode *inode, struct file *file)
145{
146 return single_open(file, export_features_show, NULL);
147}
148
149static struct file_operations export_features_operations = {
150 .open = export_features_open,
151 .read = seq_read,
152 .llseek = seq_lseek,
153 .release = single_release,
154};
155
156#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
157static int supported_enctypes_show(struct seq_file *m, void *v)
158{
159 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
160 return 0;
161}
162
163static int supported_enctypes_open(struct inode *inode, struct file *file)
164{
165 return single_open(file, supported_enctypes_show, NULL);
166}
167
168static struct file_operations supported_enctypes_ops = {
169 .open = supported_enctypes_open,
170 .read = seq_read,
171 .llseek = seq_lseek,
172 .release = single_release,
173};
174#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
175
176extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
177extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
178
179static const struct file_operations pool_stats_operations = {
180 .open = nfsd_pool_stats_open,
181 .read = seq_read,
182 .llseek = seq_lseek,
183 .release = nfsd_pool_stats_release,
184 .owner = THIS_MODULE,
185};
186
187/*----------------------------------------------------------------------------*/
188/*
189 * payload - write methods
190 */
191
192
193/**
194 * write_unlock_ip - Release all locks used by a client
195 *
196 * Experimental.
197 *
198 * Input:
199 * buf: '\n'-terminated C string containing a
200 * presentation format IP address
201 * size: length of C string in @buf
202 * Output:
203 * On success: returns zero if all specified locks were released;
204 * returns one if one or more locks were not released
205 * On error: return code is negative errno value
206 */
207static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
208{
209 struct sockaddr_storage address;
210 struct sockaddr *sap = (struct sockaddr *)&address;
211 size_t salen = sizeof(address);
212 char *fo_path;
213
214 /* sanity check */
215 if (size == 0)
216 return -EINVAL;
217
218 if (buf[size-1] != '\n')
219 return -EINVAL;
220
221 fo_path = buf;
222 if (qword_get(&buf, fo_path, size) < 0)
223 return -EINVAL;
224
225 if (rpc_pton(fo_path, size, sap, salen) == 0)
226 return -EINVAL;
227
228 return nlmsvc_unlock_all_by_ip(sap);
229}
230
231/**
232 * write_unlock_fs - Release all locks on a local file system
233 *
234 * Experimental.
235 *
236 * Input:
237 * buf: '\n'-terminated C string containing the
238 * absolute pathname of a local file system
239 * size: length of C string in @buf
240 * Output:
241 * On success: returns zero if all specified locks were released;
242 * returns one if one or more locks were not released
243 * On error: return code is negative errno value
244 */
245static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
246{
247 struct path path;
248 char *fo_path;
249 int error;
250
251 /* sanity check */
252 if (size == 0)
253 return -EINVAL;
254
255 if (buf[size-1] != '\n')
256 return -EINVAL;
257
258 fo_path = buf;
259 if (qword_get(&buf, fo_path, size) < 0)
260 return -EINVAL;
261
262 error = kern_path(fo_path, 0, &path);
263 if (error)
264 return error;
265
266 /*
267 * XXX: Needs better sanity checking. Otherwise we could end up
268 * releasing locks on the wrong file system.
269 *
270 * For example:
271 * 1. Does the path refer to a directory?
272 * 2. Is that directory a mount point, or
273 * 3. Is that directory the root of an exported file system?
274 */
275 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
276
277 path_put(&path);
278 return error;
279}
280
281/**
282 * write_filehandle - Get a variable-length NFS file handle by path
283 *
284 * On input, the buffer contains a '\n'-terminated C string comprised of
285 * three alphanumeric words separated by whitespace. The string may
286 * contain escape sequences.
287 *
288 * Input:
289 * buf:
290 * domain: client domain name
291 * path: export pathname
292 * maxsize: numeric maximum size of
293 * @buf
294 * size: length of C string in @buf
295 * Output:
296 * On success: passed-in buffer filled with '\n'-terminated C
297 * string containing a ASCII hex text version
298 * of the NFS file handle;
299 * return code is the size in bytes of the string
300 * On error: return code is negative errno value
301 */
302static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
303{
304 char *dname, *path;
305 int uninitialized_var(maxsize);
306 char *mesg = buf;
307 int len;
308 struct auth_domain *dom;
309 struct knfsd_fh fh;
310
311 if (size == 0)
312 return -EINVAL;
313
314 if (buf[size-1] != '\n')
315 return -EINVAL;
316 buf[size-1] = 0;
317
318 dname = mesg;
319 len = qword_get(&mesg, dname, size);
320 if (len <= 0)
321 return -EINVAL;
322
323 path = dname+len+1;
324 len = qword_get(&mesg, path, size);
325 if (len <= 0)
326 return -EINVAL;
327
328 len = get_int(&mesg, &maxsize);
329 if (len)
330 return len;
331
332 if (maxsize < NFS_FHSIZE)
333 return -EINVAL;
334 if (maxsize > NFS3_FHSIZE)
335 maxsize = NFS3_FHSIZE;
336
337 if (qword_get(&mesg, mesg, size)>0)
338 return -EINVAL;
339
340 /* we have all the words, they are in buf.. */
341 dom = unix_domain_find(dname);
342 if (!dom)
343 return -ENOMEM;
344
345 len = exp_rootfh(dom, path, &fh, maxsize);
346 auth_domain_put(dom);
347 if (len)
348 return len;
349
350 mesg = buf;
351 len = SIMPLE_TRANSACTION_LIMIT;
352 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
353 mesg[-1] = '\n';
354 return mesg - buf;
355}
356
357/**
358 * write_threads - Start NFSD, or report the current number of running threads
359 *
360 * Input:
361 * buf: ignored
362 * size: zero
363 * Output:
364 * On success: passed-in buffer filled with '\n'-terminated C
365 * string numeric value representing the number of
366 * running NFSD threads;
367 * return code is the size in bytes of the string
368 * On error: return code is zero
369 *
370 * OR
371 *
372 * Input:
373 * buf: C string containing an unsigned
374 * integer value representing the
375 * number of NFSD threads to start
376 * size: non-zero length of C string in @buf
377 * Output:
378 * On success: NFS service is started;
379 * passed-in buffer filled with '\n'-terminated C
380 * string numeric value representing the number of
381 * running NFSD threads;
382 * return code is the size in bytes of the string
383 * On error: return code is zero or a negative errno value
384 */
385static ssize_t write_threads(struct file *file, char *buf, size_t size)
386{
387 char *mesg = buf;
388 int rv;
389 if (size > 0) {
390 int newthreads;
391 rv = get_int(&mesg, &newthreads);
392 if (rv)
393 return rv;
394 if (newthreads < 0)
395 return -EINVAL;
396 rv = nfsd_svc(NFS_PORT, newthreads);
397 if (rv < 0)
398 return rv;
399 } else
400 rv = nfsd_nrthreads();
401
402 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
403}
404
405/**
406 * write_pool_threads - Set or report the current number of threads per pool
407 *
408 * Input:
409 * buf: ignored
410 * size: zero
411 *
412 * OR
413 *
414 * Input:
415 * buf: C string containing whitespace-
416 * separated unsigned integer values
417 * representing the number of NFSD
418 * threads to start in each pool
419 * size: non-zero length of C string in @buf
420 * Output:
421 * On success: passed-in buffer filled with '\n'-terminated C
422 * string containing integer values representing the
423 * number of NFSD threads in each pool;
424 * return code is the size in bytes of the string
425 * On error: return code is zero or a negative errno value
426 */
427static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
428{
429 /* if size > 0, look for an array of number of threads per node
430 * and apply them then write out number of threads per node as reply
431 */
432 char *mesg = buf;
433 int i;
434 int rv;
435 int len;
436 int npools;
437 int *nthreads;
438
439 mutex_lock(&nfsd_mutex);
440 npools = nfsd_nrpools();
441 if (npools == 0) {
442 /*
443 * NFS is shut down. The admin can start it by
444 * writing to the threads file but NOT the pool_threads
445 * file, sorry. Report zero threads.
446 */
447 mutex_unlock(&nfsd_mutex);
448 strcpy(buf, "0\n");
449 return strlen(buf);
450 }
451
452 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
453 rv = -ENOMEM;
454 if (nthreads == NULL)
455 goto out_free;
456
457 if (size > 0) {
458 for (i = 0; i < npools; i++) {
459 rv = get_int(&mesg, &nthreads[i]);
460 if (rv == -ENOENT)
461 break; /* fewer numbers than pools */
462 if (rv)
463 goto out_free; /* syntax error */
464 rv = -EINVAL;
465 if (nthreads[i] < 0)
466 goto out_free;
467 }
468 rv = nfsd_set_nrthreads(i, nthreads);
469 if (rv)
470 goto out_free;
471 }
472
473 rv = nfsd_get_nrthreads(npools, nthreads);
474 if (rv)
475 goto out_free;
476
477 mesg = buf;
478 size = SIMPLE_TRANSACTION_LIMIT;
479 for (i = 0; i < npools && size > 0; i++) {
480 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
481 len = strlen(mesg);
482 size -= len;
483 mesg += len;
484 }
485 rv = mesg - buf;
486out_free:
487 kfree(nthreads);
488 mutex_unlock(&nfsd_mutex);
489 return rv;
490}
491
492static ssize_t __write_versions(struct file *file, char *buf, size_t size)
493{
494 char *mesg = buf;
495 char *vers, *minorp, sign;
496 int len, num, remaining;
497 unsigned minor;
498 ssize_t tlen = 0;
499 char *sep;
500
501 if (size>0) {
502 if (nfsd_serv)
503 /* Cannot change versions without updating
504 * nfsd_serv->sv_xdrsize, and reallocing
505 * rq_argp and rq_resp
506 */
507 return -EBUSY;
508 if (buf[size-1] != '\n')
509 return -EINVAL;
510 buf[size-1] = 0;
511
512 vers = mesg;
513 len = qword_get(&mesg, vers, size);
514 if (len <= 0) return -EINVAL;
515 do {
516 sign = *vers;
517 if (sign == '+' || sign == '-')
518 num = simple_strtol((vers+1), &minorp, 0);
519 else
520 num = simple_strtol(vers, &minorp, 0);
521 if (*minorp == '.') {
522 if (num < 4)
523 return -EINVAL;
524 minor = simple_strtoul(minorp+1, NULL, 0);
525 if (minor == 0)
526 return -EINVAL;
527 if (nfsd_minorversion(minor, sign == '-' ?
528 NFSD_CLEAR : NFSD_SET) < 0)
529 return -EINVAL;
530 goto next;
531 }
532 switch(num) {
533 case 2:
534 case 3:
535 case 4:
536 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
537 break;
538 default:
539 return -EINVAL;
540 }
541 next:
542 vers += len + 1;
543 } while ((len = qword_get(&mesg, vers, size)) > 0);
544 /* If all get turned off, turn them back on, as
545 * having no versions is BAD
546 */
547 nfsd_reset_versions();
548 }
549
550 /* Now write current state into reply buffer */
551 len = 0;
552 sep = "";
553 remaining = SIMPLE_TRANSACTION_LIMIT;
554 for (num=2 ; num <= 4 ; num++)
555 if (nfsd_vers(num, NFSD_AVAIL)) {
556 len = snprintf(buf, remaining, "%s%c%d", sep,
557 nfsd_vers(num, NFSD_TEST)?'+':'-',
558 num);
559 sep = " ";
560
561 if (len > remaining)
562 break;
563 remaining -= len;
564 buf += len;
565 tlen += len;
566 }
567 if (nfsd_vers(4, NFSD_AVAIL))
568 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
569 minor++) {
570 len = snprintf(buf, remaining, " %c4.%u",
571 (nfsd_vers(4, NFSD_TEST) &&
572 nfsd_minorversion(minor, NFSD_TEST)) ?
573 '+' : '-',
574 minor);
575
576 if (len > remaining)
577 break;
578 remaining -= len;
579 buf += len;
580 tlen += len;
581 }
582
583 len = snprintf(buf, remaining, "\n");
584 if (len > remaining)
585 return -EINVAL;
586 return tlen + len;
587}
588
589/**
590 * write_versions - Set or report the available NFS protocol versions
591 *
592 * Input:
593 * buf: ignored
594 * size: zero
595 * Output:
596 * On success: passed-in buffer filled with '\n'-terminated C
597 * string containing positive or negative integer
598 * values representing the current status of each
599 * protocol version;
600 * return code is the size in bytes of the string
601 * On error: return code is zero or a negative errno value
602 *
603 * OR
604 *
605 * Input:
606 * buf: C string containing whitespace-
607 * separated positive or negative
608 * integer values representing NFS
609 * protocol versions to enable ("+n")
610 * or disable ("-n")
611 * size: non-zero length of C string in @buf
612 * Output:
613 * On success: status of zero or more protocol versions has
614 * been updated; passed-in buffer filled with
615 * '\n'-terminated C string containing positive
616 * or negative integer values representing the
617 * current status of each protocol version;
618 * return code is the size in bytes of the string
619 * On error: return code is zero or a negative errno value
620 */
621static ssize_t write_versions(struct file *file, char *buf, size_t size)
622{
623 ssize_t rv;
624
625 mutex_lock(&nfsd_mutex);
626 rv = __write_versions(file, buf, size);
627 mutex_unlock(&nfsd_mutex);
628 return rv;
629}
630
631/*
632 * Zero-length write. Return a list of NFSD's current listener
633 * transports.
634 */
635static ssize_t __write_ports_names(char *buf)
636{
637 if (nfsd_serv == NULL)
638 return 0;
639 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
640}
641
642/*
643 * A single 'fd' number was written, in which case it must be for
644 * a socket of a supported family/protocol, and we use it as an
645 * nfsd listener.
646 */
647static ssize_t __write_ports_addfd(char *buf)
648{
649 char *mesg = buf;
650 int fd, err;
651
652 err = get_int(&mesg, &fd);
653 if (err != 0 || fd < 0)
654 return -EINVAL;
655
656 err = nfsd_create_serv();
657 if (err != 0)
658 return err;
659
660 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
661 if (err < 0) {
662 svc_destroy(nfsd_serv);
663 return err;
664 }
665
666 /* Decrease the count, but don't shut down the service */
667 nfsd_serv->sv_nrthreads--;
668 return err;
669}
670
671/*
672 * A '-' followed by the 'name' of a socket means we close the socket.
673 */
674static ssize_t __write_ports_delfd(char *buf)
675{
676 char *toclose;
677 int len = 0;
678
679 toclose = kstrdup(buf + 1, GFP_KERNEL);
680 if (toclose == NULL)
681 return -ENOMEM;
682
683 if (nfsd_serv != NULL)
684 len = svc_sock_names(nfsd_serv, buf,
685 SIMPLE_TRANSACTION_LIMIT, toclose);
686 kfree(toclose);
687 return len;
688}
689
690/*
691 * A transport listener is added by writing it's transport name and
692 * a port number.
693 */
694static ssize_t __write_ports_addxprt(char *buf)
695{
696 char transport[16];
697 struct svc_xprt *xprt;
698 int port, err;
699
700 if (sscanf(buf, "%15s %4u", transport, &port) != 2)
701 return -EINVAL;
702
703 if (port < 1 || port > USHRT_MAX)
704 return -EINVAL;
705
706 err = nfsd_create_serv();
707 if (err != 0)
708 return err;
709
710 err = svc_create_xprt(nfsd_serv, transport, &init_net,
711 PF_INET, port, SVC_SOCK_ANONYMOUS);
712 if (err < 0)
713 goto out_err;
714
715 err = svc_create_xprt(nfsd_serv, transport, &init_net,
716 PF_INET6, port, SVC_SOCK_ANONYMOUS);
717 if (err < 0 && err != -EAFNOSUPPORT)
718 goto out_close;
719
720 /* Decrease the count, but don't shut down the service */
721 nfsd_serv->sv_nrthreads--;
722 return 0;
723out_close:
724 xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
725 if (xprt != NULL) {
726 svc_close_xprt(xprt);
727 svc_xprt_put(xprt);
728 }
729out_err:
730 svc_destroy(nfsd_serv);
731 return err;
732}
733
734/*
735 * A transport listener is removed by writing a "-", it's transport
736 * name, and it's port number.
737 */
738static ssize_t __write_ports_delxprt(char *buf)
739{
740 struct svc_xprt *xprt;
741 char transport[16];
742 int port;
743
744 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
745 return -EINVAL;
746
747 if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
748 return -EINVAL;
749
750 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
751 if (xprt == NULL)
752 return -ENOTCONN;
753
754 svc_close_xprt(xprt);
755 svc_xprt_put(xprt);
756 return 0;
757}
758
759static ssize_t __write_ports(struct file *file, char *buf, size_t size)
760{
761 if (size == 0)
762 return __write_ports_names(buf);
763
764 if (isdigit(buf[0]))
765 return __write_ports_addfd(buf);
766
767 if (buf[0] == '-' && isdigit(buf[1]))
768 return __write_ports_delfd(buf);
769
770 if (isalpha(buf[0]))
771 return __write_ports_addxprt(buf);
772
773 if (buf[0] == '-' && isalpha(buf[1]))
774 return __write_ports_delxprt(buf);
775
776 return -EINVAL;
777}
778
779/**
780 * write_ports - Pass a socket file descriptor or transport name to listen on
781 *
782 * Input:
783 * buf: ignored
784 * size: zero
785 * Output:
786 * On success: passed-in buffer filled with a '\n'-terminated C
787 * string containing a whitespace-separated list of
788 * named NFSD listeners;
789 * return code is the size in bytes of the string
790 * On error: return code is zero or a negative errno value
791 *
792 * OR
793 *
794 * Input:
795 * buf: C string containing an unsigned
796 * integer value representing a bound
797 * but unconnected socket that is to be
798 * used as an NFSD listener; listen(3)
799 * must be called for a SOCK_STREAM
800 * socket, otherwise it is ignored
801 * size: non-zero length of C string in @buf
802 * Output:
803 * On success: NFS service is started;
804 * passed-in buffer filled with a '\n'-terminated C
805 * string containing a unique alphanumeric name of
806 * the listener;
807 * return code is the size in bytes of the string
808 * On error: return code is a negative errno value
809 *
810 * OR
811 *
812 * Input:
813 * buf: C string containing a "-" followed
814 * by an integer value representing a
815 * previously passed in socket file
816 * descriptor
817 * size: non-zero length of C string in @buf
818 * Output:
819 * On success: NFS service no longer listens on that socket;
820 * passed-in buffer filled with a '\n'-terminated C
821 * string containing a unique name of the listener;
822 * return code is the size in bytes of the string
823 * On error: return code is a negative errno value
824 *
825 * OR
826 *
827 * Input:
828 * buf: C string containing a transport
829 * name and an unsigned integer value
830 * representing the port to listen on,
831 * separated by whitespace
832 * size: non-zero length of C string in @buf
833 * Output:
834 * On success: returns zero; NFS service is started
835 * On error: return code is a negative errno value
836 *
837 * OR
838 *
839 * Input:
840 * buf: C string containing a "-" followed
841 * by a transport name and an unsigned
842 * integer value representing the port
843 * to listen on, separated by whitespace
844 * size: non-zero length of C string in @buf
845 * Output:
846 * On success: returns zero; NFS service no longer listens
847 * on that transport
848 * On error: return code is a negative errno value
849 */
850static ssize_t write_ports(struct file *file, char *buf, size_t size)
851{
852 ssize_t rv;
853
854 mutex_lock(&nfsd_mutex);
855 rv = __write_ports(file, buf, size);
856 mutex_unlock(&nfsd_mutex);
857 return rv;
858}
859
860
861int nfsd_max_blksize;
862
863/**
864 * write_maxblksize - Set or report the current NFS blksize
865 *
866 * Input:
867 * buf: ignored
868 * size: zero
869 *
870 * OR
871 *
872 * Input:
873 * buf: C string containing an unsigned
874 * integer value representing the new
875 * NFS blksize
876 * size: non-zero length of C string in @buf
877 * Output:
878 * On success: passed-in buffer filled with '\n'-terminated C string
879 * containing numeric value of the current NFS blksize
880 * setting;
881 * return code is the size in bytes of the string
882 * On error: return code is zero or a negative errno value
883 */
884static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
885{
886 char *mesg = buf;
887 if (size > 0) {
888 int bsize;
889 int rv = get_int(&mesg, &bsize);
890 if (rv)
891 return rv;
892 /* force bsize into allowed range and
893 * required alignment.
894 */
895 if (bsize < 1024)
896 bsize = 1024;
897 if (bsize > NFSSVC_MAXBLKSIZE)
898 bsize = NFSSVC_MAXBLKSIZE;
899 bsize &= ~(1024-1);
900 mutex_lock(&nfsd_mutex);
901 if (nfsd_serv) {
902 mutex_unlock(&nfsd_mutex);
903 return -EBUSY;
904 }
905 nfsd_max_blksize = bsize;
906 mutex_unlock(&nfsd_mutex);
907 }
908
909 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
910 nfsd_max_blksize);
911}
912
913#ifdef CONFIG_NFSD_V4
914static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
915{
916 char *mesg = buf;
917 int rv, i;
918
919 if (size > 0) {
920 if (nfsd_serv)
921 return -EBUSY;
922 rv = get_int(&mesg, &i);
923 if (rv)
924 return rv;
925 /*
926 * Some sanity checking. We don't have a reason for
927 * these particular numbers, but problems with the
928 * extremes are:
929 * - Too short: the briefest network outage may
930 * cause clients to lose all their locks. Also,
931 * the frequent polling may be wasteful.
932 * - Too long: do you really want reboot recovery
933 * to take more than an hour? Or to make other
934 * clients wait an hour before being able to
935 * revoke a dead client's locks?
936 */
937 if (i < 10 || i > 3600)
938 return -EINVAL;
939 *time = i;
940 }
941
942 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
943}
944
945static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
946{
947 ssize_t rv;
948
949 mutex_lock(&nfsd_mutex);
950 rv = __nfsd4_write_time(file, buf, size, time);
951 mutex_unlock(&nfsd_mutex);
952 return rv;
953}
954
955/**
956 * write_leasetime - Set or report the current NFSv4 lease time
957 *
958 * Input:
959 * buf: ignored
960 * size: zero
961 *
962 * OR
963 *
964 * Input:
965 * buf: C string containing an unsigned
966 * integer value representing the new
967 * NFSv4 lease expiry time
968 * size: non-zero length of C string in @buf
969 * Output:
970 * On success: passed-in buffer filled with '\n'-terminated C
971 * string containing unsigned integer value of the
972 * current lease expiry time;
973 * return code is the size in bytes of the string
974 * On error: return code is zero or a negative errno value
975 */
976static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
977{
978 return nfsd4_write_time(file, buf, size, &nfsd4_lease);
979}
980
981/**
982 * write_gracetime - Set or report current NFSv4 grace period time
983 *
984 * As above, but sets the time of the NFSv4 grace period.
985 *
986 * Note this should never be set to less than the *previous*
987 * lease-period time, but we don't try to enforce this. (In the common
988 * case (a new boot), we don't know what the previous lease time was
989 * anyway.)
990 */
991static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
992{
993 return nfsd4_write_time(file, buf, size, &nfsd4_grace);
994}
995
996extern char *nfs4_recoverydir(void);
997
998static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
999{
1000 char *mesg = buf;
1001 char *recdir;
1002 int len, status;
1003
1004 if (size > 0) {
1005 if (nfsd_serv)
1006 return -EBUSY;
1007 if (size > PATH_MAX || buf[size-1] != '\n')
1008 return -EINVAL;
1009 buf[size-1] = 0;
1010
1011 recdir = mesg;
1012 len = qword_get(&mesg, recdir, size);
1013 if (len <= 0)
1014 return -EINVAL;
1015
1016 status = nfs4_reset_recoverydir(recdir);
1017 if (status)
1018 return status;
1019 }
1020
1021 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1022 nfs4_recoverydir());
1023}
1024
1025/**
1026 * write_recoverydir - Set or report the pathname of the recovery directory
1027 *
1028 * Input:
1029 * buf: ignored
1030 * size: zero
1031 *
1032 * OR
1033 *
1034 * Input:
1035 * buf: C string containing the pathname
1036 * of the directory on a local file
1037 * system containing permanent NFSv4
1038 * recovery data
1039 * size: non-zero length of C string in @buf
1040 * Output:
1041 * On success: passed-in buffer filled with '\n'-terminated C string
1042 * containing the current recovery pathname setting;
1043 * return code is the size in bytes of the string
1044 * On error: return code is zero or a negative errno value
1045 */
1046static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1047{
1048 ssize_t rv;
1049
1050 mutex_lock(&nfsd_mutex);
1051 rv = __write_recoverydir(file, buf, size);
1052 mutex_unlock(&nfsd_mutex);
1053 return rv;
1054}
1055
1056#endif
1057
1058/*----------------------------------------------------------------------------*/
1059/*
1060 * populating the filesystem.
1061 */
1062
1063static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1064{
1065 static struct tree_descr nfsd_files[] = {
1066 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1067 [NFSD_Export_features] = {"export_features",
1068 &export_features_operations, S_IRUGO},
1069 [NFSD_FO_UnlockIP] = {"unlock_ip",
1070 &transaction_ops, S_IWUSR|S_IRUSR},
1071 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1072 &transaction_ops, S_IWUSR|S_IRUSR},
1073 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1074 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1075 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1076 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1077 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1078 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1079 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1080#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1081 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1082#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1083#ifdef CONFIG_NFSD_V4
1084 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1085 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1086 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1087#endif
1088 /* last one */ {""}
1089 };
1090 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1091}
1092
1093static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1094 int flags, const char *dev_name, void *data)
1095{
1096 return mount_single(fs_type, flags, data, nfsd_fill_super);
1097}
1098
1099static struct file_system_type nfsd_fs_type = {
1100 .owner = THIS_MODULE,
1101 .name = "nfsd",
1102 .mount = nfsd_mount,
1103 .kill_sb = kill_litter_super,
1104};
1105
1106#ifdef CONFIG_PROC_FS
1107static int create_proc_exports_entry(void)
1108{
1109 struct proc_dir_entry *entry;
1110
1111 entry = proc_mkdir("fs/nfs", NULL);
1112 if (!entry)
1113 return -ENOMEM;
1114 entry = proc_create("exports", 0, entry, &exports_operations);
1115 if (!entry)
1116 return -ENOMEM;
1117 return 0;
1118}
1119#else /* CONFIG_PROC_FS */
1120static int create_proc_exports_entry(void)
1121{
1122 return 0;
1123}
1124#endif
1125
1126static int __init init_nfsd(void)
1127{
1128 int retval;
1129 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1130
1131 retval = nfs4_state_init(); /* nfs4 locking state */
1132 if (retval)
1133 return retval;
1134 nfsd_stat_init(); /* Statistics */
1135 retval = nfsd_reply_cache_init();
1136 if (retval)
1137 goto out_free_stat;
1138 retval = nfsd_export_init();
1139 if (retval)
1140 goto out_free_cache;
1141 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1142 retval = nfsd_idmap_init();
1143 if (retval)
1144 goto out_free_lockd;
1145 retval = create_proc_exports_entry();
1146 if (retval)
1147 goto out_free_idmap;
1148 retval = register_filesystem(&nfsd_fs_type);
1149 if (retval)
1150 goto out_free_all;
1151 return 0;
1152out_free_all:
1153 remove_proc_entry("fs/nfs/exports", NULL);
1154 remove_proc_entry("fs/nfs", NULL);
1155out_free_idmap:
1156 nfsd_idmap_shutdown();
1157out_free_lockd:
1158 nfsd_lockd_shutdown();
1159 nfsd_export_shutdown();
1160out_free_cache:
1161 nfsd_reply_cache_shutdown();
1162out_free_stat:
1163 nfsd_stat_shutdown();
1164 nfsd4_free_slabs();
1165 return retval;
1166}
1167
1168static void __exit exit_nfsd(void)
1169{
1170 nfsd_export_shutdown();
1171 nfsd_reply_cache_shutdown();
1172 remove_proc_entry("fs/nfs/exports", NULL);
1173 remove_proc_entry("fs/nfs", NULL);
1174 nfsd_stat_shutdown();
1175 nfsd_lockd_shutdown();
1176 nfsd_idmap_shutdown();
1177 nfsd4_free_slabs();
1178 unregister_filesystem(&nfsd_fs_type);
1179}
1180
1181MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1182MODULE_LICENSE("GPL");
1183module_init(init_nfsd)
1184module_exit(exit_nfsd)