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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/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#include "pnfs.h"
25
26/*
27 * We have a single directory with several nodes in it.
28 */
29enum {
30 NFSD_Root = 1,
31 NFSD_List,
32 NFSD_Export_features,
33 NFSD_Fh,
34 NFSD_FO_UnlockIP,
35 NFSD_FO_UnlockFS,
36 NFSD_Threads,
37 NFSD_Pool_Threads,
38 NFSD_Pool_Stats,
39 NFSD_Reply_Cache_Stats,
40 NFSD_Versions,
41 NFSD_Ports,
42 NFSD_MaxBlkSize,
43 NFSD_MaxConnections,
44 NFSD_SupportedEnctypes,
45 /*
46 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
47 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
48 */
49#ifdef CONFIG_NFSD_V4
50 NFSD_Leasetime,
51 NFSD_Gracetime,
52 NFSD_RecoveryDir,
53 NFSD_V4EndGrace,
54#endif
55};
56
57/*
58 * write() for these nodes.
59 */
60static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
61static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
62static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
63static ssize_t write_threads(struct file *file, char *buf, size_t size);
64static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
65static ssize_t write_versions(struct file *file, char *buf, size_t size);
66static ssize_t write_ports(struct file *file, char *buf, size_t size);
67static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
68static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
69#ifdef CONFIG_NFSD_V4
70static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
71static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
72static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
73static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
74#endif
75
76static ssize_t (*write_op[])(struct file *, char *, size_t) = {
77 [NFSD_Fh] = write_filehandle,
78 [NFSD_FO_UnlockIP] = write_unlock_ip,
79 [NFSD_FO_UnlockFS] = write_unlock_fs,
80 [NFSD_Threads] = write_threads,
81 [NFSD_Pool_Threads] = write_pool_threads,
82 [NFSD_Versions] = write_versions,
83 [NFSD_Ports] = write_ports,
84 [NFSD_MaxBlkSize] = write_maxblksize,
85 [NFSD_MaxConnections] = write_maxconn,
86#ifdef CONFIG_NFSD_V4
87 [NFSD_Leasetime] = write_leasetime,
88 [NFSD_Gracetime] = write_gracetime,
89 [NFSD_RecoveryDir] = write_recoverydir,
90 [NFSD_V4EndGrace] = write_v4_end_grace,
91#endif
92};
93
94static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
95{
96 ino_t ino = file_inode(file)->i_ino;
97 char *data;
98 ssize_t rv;
99
100 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
101 return -EINVAL;
102
103 data = simple_transaction_get(file, buf, size);
104 if (IS_ERR(data))
105 return PTR_ERR(data);
106
107 rv = write_op[ino](file, data, size);
108 if (rv >= 0) {
109 simple_transaction_set(file, rv);
110 rv = size;
111 }
112 return rv;
113}
114
115static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
116{
117 if (! file->private_data) {
118 /* An attempt to read a transaction file without writing
119 * causes a 0-byte write so that the file can return
120 * state information
121 */
122 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
123 if (rv < 0)
124 return rv;
125 }
126 return simple_transaction_read(file, buf, size, pos);
127}
128
129static const struct file_operations transaction_ops = {
130 .write = nfsctl_transaction_write,
131 .read = nfsctl_transaction_read,
132 .release = simple_transaction_release,
133 .llseek = default_llseek,
134};
135
136static int exports_net_open(struct net *net, struct file *file)
137{
138 int err;
139 struct seq_file *seq;
140 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
141
142 err = seq_open(file, &nfs_exports_op);
143 if (err)
144 return err;
145
146 seq = file->private_data;
147 seq->private = nn->svc_export_cache;
148 return 0;
149}
150
151static int exports_proc_open(struct inode *inode, struct file *file)
152{
153 return exports_net_open(current->nsproxy->net_ns, file);
154}
155
156static const struct file_operations exports_proc_operations = {
157 .open = exports_proc_open,
158 .read = seq_read,
159 .llseek = seq_lseek,
160 .release = seq_release,
161 .owner = THIS_MODULE,
162};
163
164static int exports_nfsd_open(struct inode *inode, struct file *file)
165{
166 return exports_net_open(inode->i_sb->s_fs_info, file);
167}
168
169static const struct file_operations exports_nfsd_operations = {
170 .open = exports_nfsd_open,
171 .read = seq_read,
172 .llseek = seq_lseek,
173 .release = seq_release,
174 .owner = THIS_MODULE,
175};
176
177static int export_features_show(struct seq_file *m, void *v)
178{
179 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
180 return 0;
181}
182
183static int export_features_open(struct inode *inode, struct file *file)
184{
185 return single_open(file, export_features_show, NULL);
186}
187
188static const struct file_operations export_features_operations = {
189 .open = export_features_open,
190 .read = seq_read,
191 .llseek = seq_lseek,
192 .release = single_release,
193};
194
195#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
196static int supported_enctypes_show(struct seq_file *m, void *v)
197{
198 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
199 return 0;
200}
201
202static int supported_enctypes_open(struct inode *inode, struct file *file)
203{
204 return single_open(file, supported_enctypes_show, NULL);
205}
206
207static const struct file_operations supported_enctypes_ops = {
208 .open = supported_enctypes_open,
209 .read = seq_read,
210 .llseek = seq_lseek,
211 .release = single_release,
212};
213#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
214
215static const struct file_operations pool_stats_operations = {
216 .open = nfsd_pool_stats_open,
217 .read = seq_read,
218 .llseek = seq_lseek,
219 .release = nfsd_pool_stats_release,
220 .owner = THIS_MODULE,
221};
222
223static struct file_operations reply_cache_stats_operations = {
224 .open = nfsd_reply_cache_stats_open,
225 .read = seq_read,
226 .llseek = seq_lseek,
227 .release = single_release,
228};
229
230/*----------------------------------------------------------------------------*/
231/*
232 * payload - write methods
233 */
234
235static inline struct net *netns(struct file *file)
236{
237 return file_inode(file)->i_sb->s_fs_info;
238}
239
240/**
241 * write_unlock_ip - Release all locks used by a client
242 *
243 * Experimental.
244 *
245 * Input:
246 * buf: '\n'-terminated C string containing a
247 * presentation format IP address
248 * size: length of C string in @buf
249 * Output:
250 * On success: returns zero if all specified locks were released;
251 * returns one if one or more locks were not released
252 * On error: return code is negative errno value
253 */
254static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
255{
256 struct sockaddr_storage address;
257 struct sockaddr *sap = (struct sockaddr *)&address;
258 size_t salen = sizeof(address);
259 char *fo_path;
260 struct net *net = netns(file);
261
262 /* sanity check */
263 if (size == 0)
264 return -EINVAL;
265
266 if (buf[size-1] != '\n')
267 return -EINVAL;
268
269 fo_path = buf;
270 if (qword_get(&buf, fo_path, size) < 0)
271 return -EINVAL;
272
273 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
274 return -EINVAL;
275
276 return nlmsvc_unlock_all_by_ip(sap);
277}
278
279/**
280 * write_unlock_fs - Release all locks on a local file system
281 *
282 * Experimental.
283 *
284 * Input:
285 * buf: '\n'-terminated C string containing the
286 * absolute pathname of a local file system
287 * size: length of C string in @buf
288 * Output:
289 * On success: returns zero if all specified locks were released;
290 * returns one if one or more locks were not released
291 * On error: return code is negative errno value
292 */
293static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
294{
295 struct path path;
296 char *fo_path;
297 int error;
298
299 /* sanity check */
300 if (size == 0)
301 return -EINVAL;
302
303 if (buf[size-1] != '\n')
304 return -EINVAL;
305
306 fo_path = buf;
307 if (qword_get(&buf, fo_path, size) < 0)
308 return -EINVAL;
309
310 error = kern_path(fo_path, 0, &path);
311 if (error)
312 return error;
313
314 /*
315 * XXX: Needs better sanity checking. Otherwise we could end up
316 * releasing locks on the wrong file system.
317 *
318 * For example:
319 * 1. Does the path refer to a directory?
320 * 2. Is that directory a mount point, or
321 * 3. Is that directory the root of an exported file system?
322 */
323 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
324
325 path_put(&path);
326 return error;
327}
328
329/**
330 * write_filehandle - Get a variable-length NFS file handle by path
331 *
332 * On input, the buffer contains a '\n'-terminated C string comprised of
333 * three alphanumeric words separated by whitespace. The string may
334 * contain escape sequences.
335 *
336 * Input:
337 * buf:
338 * domain: client domain name
339 * path: export pathname
340 * maxsize: numeric maximum size of
341 * @buf
342 * size: length of C string in @buf
343 * Output:
344 * On success: passed-in buffer filled with '\n'-terminated C
345 * string containing a ASCII hex text version
346 * of the NFS file handle;
347 * return code is the size in bytes of the string
348 * On error: return code is negative errno value
349 */
350static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
351{
352 char *dname, *path;
353 int uninitialized_var(maxsize);
354 char *mesg = buf;
355 int len;
356 struct auth_domain *dom;
357 struct knfsd_fh fh;
358
359 if (size == 0)
360 return -EINVAL;
361
362 if (buf[size-1] != '\n')
363 return -EINVAL;
364 buf[size-1] = 0;
365
366 dname = mesg;
367 len = qword_get(&mesg, dname, size);
368 if (len <= 0)
369 return -EINVAL;
370
371 path = dname+len+1;
372 len = qword_get(&mesg, path, size);
373 if (len <= 0)
374 return -EINVAL;
375
376 len = get_int(&mesg, &maxsize);
377 if (len)
378 return len;
379
380 if (maxsize < NFS_FHSIZE)
381 return -EINVAL;
382 maxsize = min(maxsize, NFS3_FHSIZE);
383
384 if (qword_get(&mesg, mesg, size)>0)
385 return -EINVAL;
386
387 /* we have all the words, they are in buf.. */
388 dom = unix_domain_find(dname);
389 if (!dom)
390 return -ENOMEM;
391
392 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
393 auth_domain_put(dom);
394 if (len)
395 return len;
396
397 mesg = buf;
398 len = SIMPLE_TRANSACTION_LIMIT;
399 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
400 mesg[-1] = '\n';
401 return mesg - buf;
402}
403
404/**
405 * write_threads - Start NFSD, or report the current number of running threads
406 *
407 * Input:
408 * buf: ignored
409 * size: zero
410 * Output:
411 * On success: passed-in buffer filled with '\n'-terminated C
412 * string numeric value representing the number of
413 * running NFSD threads;
414 * return code is the size in bytes of the string
415 * On error: return code is zero
416 *
417 * OR
418 *
419 * Input:
420 * buf: C string containing an unsigned
421 * integer value representing the
422 * number of NFSD threads to start
423 * size: non-zero length of C string in @buf
424 * Output:
425 * On success: NFS service is started;
426 * passed-in buffer filled with '\n'-terminated C
427 * string numeric value representing the number of
428 * running NFSD threads;
429 * return code is the size in bytes of the string
430 * On error: return code is zero or a negative errno value
431 */
432static ssize_t write_threads(struct file *file, char *buf, size_t size)
433{
434 char *mesg = buf;
435 int rv;
436 struct net *net = netns(file);
437
438 if (size > 0) {
439 int newthreads;
440 rv = get_int(&mesg, &newthreads);
441 if (rv)
442 return rv;
443 if (newthreads < 0)
444 return -EINVAL;
445 rv = nfsd_svc(newthreads, net);
446 if (rv < 0)
447 return rv;
448 } else
449 rv = nfsd_nrthreads(net);
450
451 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
452}
453
454/**
455 * write_pool_threads - Set or report the current number of threads per pool
456 *
457 * Input:
458 * buf: ignored
459 * size: zero
460 *
461 * OR
462 *
463 * Input:
464 * buf: C string containing whitespace-
465 * separated unsigned integer values
466 * representing the number of NFSD
467 * threads to start in each pool
468 * size: non-zero length of C string in @buf
469 * Output:
470 * On success: passed-in buffer filled with '\n'-terminated C
471 * string containing integer values representing the
472 * number of NFSD threads in each pool;
473 * return code is the size in bytes of the string
474 * On error: return code is zero or a negative errno value
475 */
476static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
477{
478 /* if size > 0, look for an array of number of threads per node
479 * and apply them then write out number of threads per node as reply
480 */
481 char *mesg = buf;
482 int i;
483 int rv;
484 int len;
485 int npools;
486 int *nthreads;
487 struct net *net = netns(file);
488
489 mutex_lock(&nfsd_mutex);
490 npools = nfsd_nrpools(net);
491 if (npools == 0) {
492 /*
493 * NFS is shut down. The admin can start it by
494 * writing to the threads file but NOT the pool_threads
495 * file, sorry. Report zero threads.
496 */
497 mutex_unlock(&nfsd_mutex);
498 strcpy(buf, "0\n");
499 return strlen(buf);
500 }
501
502 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
503 rv = -ENOMEM;
504 if (nthreads == NULL)
505 goto out_free;
506
507 if (size > 0) {
508 for (i = 0; i < npools; i++) {
509 rv = get_int(&mesg, &nthreads[i]);
510 if (rv == -ENOENT)
511 break; /* fewer numbers than pools */
512 if (rv)
513 goto out_free; /* syntax error */
514 rv = -EINVAL;
515 if (nthreads[i] < 0)
516 goto out_free;
517 }
518 rv = nfsd_set_nrthreads(i, nthreads, net);
519 if (rv)
520 goto out_free;
521 }
522
523 rv = nfsd_get_nrthreads(npools, nthreads, net);
524 if (rv)
525 goto out_free;
526
527 mesg = buf;
528 size = SIMPLE_TRANSACTION_LIMIT;
529 for (i = 0; i < npools && size > 0; i++) {
530 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
531 len = strlen(mesg);
532 size -= len;
533 mesg += len;
534 }
535 rv = mesg - buf;
536out_free:
537 kfree(nthreads);
538 mutex_unlock(&nfsd_mutex);
539 return rv;
540}
541
542static ssize_t __write_versions(struct file *file, char *buf, size_t size)
543{
544 char *mesg = buf;
545 char *vers, *minorp, sign;
546 int len, num, remaining;
547 unsigned minor;
548 ssize_t tlen = 0;
549 char *sep;
550 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
551
552 if (size>0) {
553 if (nn->nfsd_serv)
554 /* Cannot change versions without updating
555 * nn->nfsd_serv->sv_xdrsize, and reallocing
556 * rq_argp and rq_resp
557 */
558 return -EBUSY;
559 if (buf[size-1] != '\n')
560 return -EINVAL;
561 buf[size-1] = 0;
562
563 vers = mesg;
564 len = qword_get(&mesg, vers, size);
565 if (len <= 0) return -EINVAL;
566 do {
567 sign = *vers;
568 if (sign == '+' || sign == '-')
569 num = simple_strtol((vers+1), &minorp, 0);
570 else
571 num = simple_strtol(vers, &minorp, 0);
572 if (*minorp == '.') {
573 if (num != 4)
574 return -EINVAL;
575 minor = simple_strtoul(minorp+1, NULL, 0);
576 if (minor == 0)
577 return -EINVAL;
578 if (nfsd_minorversion(minor, sign == '-' ?
579 NFSD_CLEAR : NFSD_SET) < 0)
580 return -EINVAL;
581 goto next;
582 }
583 switch(num) {
584 case 2:
585 case 3:
586 case 4:
587 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
588 break;
589 default:
590 return -EINVAL;
591 }
592 next:
593 vers += len + 1;
594 } while ((len = qword_get(&mesg, vers, size)) > 0);
595 /* If all get turned off, turn them back on, as
596 * having no versions is BAD
597 */
598 nfsd_reset_versions();
599 }
600
601 /* Now write current state into reply buffer */
602 len = 0;
603 sep = "";
604 remaining = SIMPLE_TRANSACTION_LIMIT;
605 for (num=2 ; num <= 4 ; num++)
606 if (nfsd_vers(num, NFSD_AVAIL)) {
607 len = snprintf(buf, remaining, "%s%c%d", sep,
608 nfsd_vers(num, NFSD_TEST)?'+':'-',
609 num);
610 sep = " ";
611
612 if (len >= remaining)
613 break;
614 remaining -= len;
615 buf += len;
616 tlen += len;
617 }
618 if (nfsd_vers(4, NFSD_AVAIL))
619 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
620 minor++) {
621 len = snprintf(buf, remaining, " %c4.%u",
622 (nfsd_vers(4, NFSD_TEST) &&
623 nfsd_minorversion(minor, NFSD_TEST)) ?
624 '+' : '-',
625 minor);
626
627 if (len >= remaining)
628 break;
629 remaining -= len;
630 buf += len;
631 tlen += len;
632 }
633
634 len = snprintf(buf, remaining, "\n");
635 if (len >= remaining)
636 return -EINVAL;
637 return tlen + len;
638}
639
640/**
641 * write_versions - Set or report the available NFS protocol versions
642 *
643 * Input:
644 * buf: ignored
645 * size: zero
646 * Output:
647 * On success: passed-in buffer filled with '\n'-terminated C
648 * string containing positive or negative integer
649 * values representing the current status of each
650 * protocol version;
651 * return code is the size in bytes of the string
652 * On error: return code is zero or a negative errno value
653 *
654 * OR
655 *
656 * Input:
657 * buf: C string containing whitespace-
658 * separated positive or negative
659 * integer values representing NFS
660 * protocol versions to enable ("+n")
661 * or disable ("-n")
662 * size: non-zero length of C string in @buf
663 * Output:
664 * On success: status of zero or more protocol versions has
665 * been updated; passed-in buffer filled with
666 * '\n'-terminated C string containing positive
667 * or negative integer values representing the
668 * current status of each protocol version;
669 * return code is the size in bytes of the string
670 * On error: return code is zero or a negative errno value
671 */
672static ssize_t write_versions(struct file *file, char *buf, size_t size)
673{
674 ssize_t rv;
675
676 mutex_lock(&nfsd_mutex);
677 rv = __write_versions(file, buf, size);
678 mutex_unlock(&nfsd_mutex);
679 return rv;
680}
681
682/*
683 * Zero-length write. Return a list of NFSD's current listener
684 * transports.
685 */
686static ssize_t __write_ports_names(char *buf, struct net *net)
687{
688 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
689
690 if (nn->nfsd_serv == NULL)
691 return 0;
692 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
693}
694
695/*
696 * A single 'fd' number was written, in which case it must be for
697 * a socket of a supported family/protocol, and we use it as an
698 * nfsd listener.
699 */
700static ssize_t __write_ports_addfd(char *buf, struct net *net)
701{
702 char *mesg = buf;
703 int fd, err;
704 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
705
706 err = get_int(&mesg, &fd);
707 if (err != 0 || fd < 0)
708 return -EINVAL;
709
710 if (svc_alien_sock(net, fd)) {
711 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
712 return -EINVAL;
713 }
714
715 err = nfsd_create_serv(net);
716 if (err != 0)
717 return err;
718
719 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
720 if (err < 0) {
721 nfsd_destroy(net);
722 return err;
723 }
724
725 /* Decrease the count, but don't shut down the service */
726 nn->nfsd_serv->sv_nrthreads--;
727 return err;
728}
729
730/*
731 * A transport listener is added by writing it's transport name and
732 * a port number.
733 */
734static ssize_t __write_ports_addxprt(char *buf, struct net *net)
735{
736 char transport[16];
737 struct svc_xprt *xprt;
738 int port, err;
739 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
740
741 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
742 return -EINVAL;
743
744 if (port < 1 || port > USHRT_MAX)
745 return -EINVAL;
746
747 err = nfsd_create_serv(net);
748 if (err != 0)
749 return err;
750
751 err = svc_create_xprt(nn->nfsd_serv, transport, net,
752 PF_INET, port, SVC_SOCK_ANONYMOUS);
753 if (err < 0)
754 goto out_err;
755
756 err = svc_create_xprt(nn->nfsd_serv, transport, net,
757 PF_INET6, port, SVC_SOCK_ANONYMOUS);
758 if (err < 0 && err != -EAFNOSUPPORT)
759 goto out_close;
760
761 /* Decrease the count, but don't shut down the service */
762 nn->nfsd_serv->sv_nrthreads--;
763 return 0;
764out_close:
765 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
766 if (xprt != NULL) {
767 svc_close_xprt(xprt);
768 svc_xprt_put(xprt);
769 }
770out_err:
771 nfsd_destroy(net);
772 return err;
773}
774
775static ssize_t __write_ports(struct file *file, char *buf, size_t size,
776 struct net *net)
777{
778 if (size == 0)
779 return __write_ports_names(buf, net);
780
781 if (isdigit(buf[0]))
782 return __write_ports_addfd(buf, net);
783
784 if (isalpha(buf[0]))
785 return __write_ports_addxprt(buf, net);
786
787 return -EINVAL;
788}
789
790/**
791 * write_ports - Pass a socket file descriptor or transport name to listen on
792 *
793 * Input:
794 * buf: ignored
795 * size: zero
796 * Output:
797 * On success: passed-in buffer filled with a '\n'-terminated C
798 * string containing a whitespace-separated list of
799 * named NFSD listeners;
800 * return code is the size in bytes of the string
801 * On error: return code is zero or a negative errno value
802 *
803 * OR
804 *
805 * Input:
806 * buf: C string containing an unsigned
807 * integer value representing a bound
808 * but unconnected socket that is to be
809 * used as an NFSD listener; listen(3)
810 * must be called for a SOCK_STREAM
811 * socket, otherwise it is ignored
812 * size: non-zero length of C string in @buf
813 * Output:
814 * On success: NFS service is started;
815 * passed-in buffer filled with a '\n'-terminated C
816 * string containing a unique alphanumeric name of
817 * the listener;
818 * return code is the size in bytes of the string
819 * On error: return code is a negative errno value
820 *
821 * OR
822 *
823 * Input:
824 * buf: C string containing a transport
825 * name and an unsigned integer value
826 * representing the port to listen on,
827 * separated by whitespace
828 * size: non-zero length of C string in @buf
829 * Output:
830 * On success: returns zero; NFS service is started
831 * On error: return code is a negative errno value
832 */
833static ssize_t write_ports(struct file *file, char *buf, size_t size)
834{
835 ssize_t rv;
836
837 mutex_lock(&nfsd_mutex);
838 rv = __write_ports(file, buf, size, netns(file));
839 mutex_unlock(&nfsd_mutex);
840 return rv;
841}
842
843
844int nfsd_max_blksize;
845
846/**
847 * write_maxblksize - Set or report the current NFS blksize
848 *
849 * Input:
850 * buf: ignored
851 * size: zero
852 *
853 * OR
854 *
855 * Input:
856 * buf: C string containing an unsigned
857 * integer value representing the new
858 * NFS blksize
859 * size: non-zero length of C string in @buf
860 * Output:
861 * On success: passed-in buffer filled with '\n'-terminated C string
862 * containing numeric value of the current NFS blksize
863 * setting;
864 * return code is the size in bytes of the string
865 * On error: return code is zero or a negative errno value
866 */
867static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
868{
869 char *mesg = buf;
870 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
871
872 if (size > 0) {
873 int bsize;
874 int rv = get_int(&mesg, &bsize);
875 if (rv)
876 return rv;
877 /* force bsize into allowed range and
878 * required alignment.
879 */
880 bsize = max_t(int, bsize, 1024);
881 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
882 bsize &= ~(1024-1);
883 mutex_lock(&nfsd_mutex);
884 if (nn->nfsd_serv) {
885 mutex_unlock(&nfsd_mutex);
886 return -EBUSY;
887 }
888 nfsd_max_blksize = bsize;
889 mutex_unlock(&nfsd_mutex);
890 }
891
892 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
893 nfsd_max_blksize);
894}
895
896/**
897 * write_maxconn - Set or report the current max number of connections
898 *
899 * Input:
900 * buf: ignored
901 * size: zero
902 * OR
903 *
904 * Input:
905 * buf: C string containing an unsigned
906 * integer value representing the new
907 * number of max connections
908 * size: non-zero length of C string in @buf
909 * Output:
910 * On success: passed-in buffer filled with '\n'-terminated C string
911 * containing numeric value of max_connections setting
912 * for this net namespace;
913 * return code is the size in bytes of the string
914 * On error: return code is zero or a negative errno value
915 */
916static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
917{
918 char *mesg = buf;
919 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
920 unsigned int maxconn = nn->max_connections;
921
922 if (size > 0) {
923 int rv = get_uint(&mesg, &maxconn);
924
925 if (rv)
926 return rv;
927 nn->max_connections = maxconn;
928 }
929
930 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
931}
932
933#ifdef CONFIG_NFSD_V4
934static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
935 time_t *time, struct nfsd_net *nn)
936{
937 char *mesg = buf;
938 int rv, i;
939
940 if (size > 0) {
941 if (nn->nfsd_serv)
942 return -EBUSY;
943 rv = get_int(&mesg, &i);
944 if (rv)
945 return rv;
946 /*
947 * Some sanity checking. We don't have a reason for
948 * these particular numbers, but problems with the
949 * extremes are:
950 * - Too short: the briefest network outage may
951 * cause clients to lose all their locks. Also,
952 * the frequent polling may be wasteful.
953 * - Too long: do you really want reboot recovery
954 * to take more than an hour? Or to make other
955 * clients wait an hour before being able to
956 * revoke a dead client's locks?
957 */
958 if (i < 10 || i > 3600)
959 return -EINVAL;
960 *time = i;
961 }
962
963 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
964}
965
966static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
967 time_t *time, struct nfsd_net *nn)
968{
969 ssize_t rv;
970
971 mutex_lock(&nfsd_mutex);
972 rv = __nfsd4_write_time(file, buf, size, time, nn);
973 mutex_unlock(&nfsd_mutex);
974 return rv;
975}
976
977/**
978 * write_leasetime - Set or report the current NFSv4 lease time
979 *
980 * Input:
981 * buf: ignored
982 * size: zero
983 *
984 * OR
985 *
986 * Input:
987 * buf: C string containing an unsigned
988 * integer value representing the new
989 * NFSv4 lease expiry time
990 * size: non-zero length of C string in @buf
991 * Output:
992 * On success: passed-in buffer filled with '\n'-terminated C
993 * string containing unsigned integer value of the
994 * current lease expiry time;
995 * return code is the size in bytes of the string
996 * On error: return code is zero or a negative errno value
997 */
998static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
999{
1000 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1001 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1002}
1003
1004/**
1005 * write_gracetime - Set or report current NFSv4 grace period time
1006 *
1007 * As above, but sets the time of the NFSv4 grace period.
1008 *
1009 * Note this should never be set to less than the *previous*
1010 * lease-period time, but we don't try to enforce this. (In the common
1011 * case (a new boot), we don't know what the previous lease time was
1012 * anyway.)
1013 */
1014static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1015{
1016 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1017 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1018}
1019
1020static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1021 struct nfsd_net *nn)
1022{
1023 char *mesg = buf;
1024 char *recdir;
1025 int len, status;
1026
1027 if (size > 0) {
1028 if (nn->nfsd_serv)
1029 return -EBUSY;
1030 if (size > PATH_MAX || buf[size-1] != '\n')
1031 return -EINVAL;
1032 buf[size-1] = 0;
1033
1034 recdir = mesg;
1035 len = qword_get(&mesg, recdir, size);
1036 if (len <= 0)
1037 return -EINVAL;
1038
1039 status = nfs4_reset_recoverydir(recdir);
1040 if (status)
1041 return status;
1042 }
1043
1044 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1045 nfs4_recoverydir());
1046}
1047
1048/**
1049 * write_recoverydir - Set or report the pathname of the recovery directory
1050 *
1051 * Input:
1052 * buf: ignored
1053 * size: zero
1054 *
1055 * OR
1056 *
1057 * Input:
1058 * buf: C string containing the pathname
1059 * of the directory on a local file
1060 * system containing permanent NFSv4
1061 * recovery data
1062 * size: non-zero length of C string in @buf
1063 * Output:
1064 * On success: passed-in buffer filled with '\n'-terminated C string
1065 * containing the current recovery pathname setting;
1066 * return code is the size in bytes of the string
1067 * On error: return code is zero or a negative errno value
1068 */
1069static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1070{
1071 ssize_t rv;
1072 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1073
1074 mutex_lock(&nfsd_mutex);
1075 rv = __write_recoverydir(file, buf, size, nn);
1076 mutex_unlock(&nfsd_mutex);
1077 return rv;
1078}
1079
1080/**
1081 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1082 *
1083 * Input:
1084 * buf: ignored
1085 * size: zero
1086 * OR
1087 *
1088 * Input:
1089 * buf: any value
1090 * size: non-zero length of C string in @buf
1091 * Output:
1092 * passed-in buffer filled with "Y" or "N" with a newline
1093 * and NULL-terminated C string. This indicates whether
1094 * the grace period has ended in the current net
1095 * namespace. Return code is the size in bytes of the
1096 * string. Writing a string that starts with 'Y', 'y', or
1097 * '1' to the file will end the grace period for nfsd's v4
1098 * lock manager.
1099 */
1100static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1101{
1102 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1103
1104 if (size > 0) {
1105 switch(buf[0]) {
1106 case 'Y':
1107 case 'y':
1108 case '1':
1109 nfsd4_end_grace(nn);
1110 break;
1111 default:
1112 return -EINVAL;
1113 }
1114 }
1115
1116 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1117 nn->grace_ended ? 'Y' : 'N');
1118}
1119
1120#endif
1121
1122/*----------------------------------------------------------------------------*/
1123/*
1124 * populating the filesystem.
1125 */
1126
1127static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1128{
1129 static struct tree_descr nfsd_files[] = {
1130 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1131 [NFSD_Export_features] = {"export_features",
1132 &export_features_operations, S_IRUGO},
1133 [NFSD_FO_UnlockIP] = {"unlock_ip",
1134 &transaction_ops, S_IWUSR|S_IRUSR},
1135 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1136 &transaction_ops, S_IWUSR|S_IRUSR},
1137 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1138 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1139 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1140 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1141 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1142 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1143 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1144 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1145 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1146#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1147 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1148#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1149#ifdef CONFIG_NFSD_V4
1150 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1151 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1152 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1153 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1154#endif
1155 /* last one */ {""}
1156 };
1157 struct net *net = data;
1158 int ret;
1159
1160 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1161 if (ret)
1162 return ret;
1163 sb->s_fs_info = get_net(net);
1164 return 0;
1165}
1166
1167static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1168 int flags, const char *dev_name, void *data)
1169{
1170 return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1171}
1172
1173static void nfsd_umount(struct super_block *sb)
1174{
1175 struct net *net = sb->s_fs_info;
1176
1177 kill_litter_super(sb);
1178 put_net(net);
1179}
1180
1181static struct file_system_type nfsd_fs_type = {
1182 .owner = THIS_MODULE,
1183 .name = "nfsd",
1184 .mount = nfsd_mount,
1185 .kill_sb = nfsd_umount,
1186};
1187MODULE_ALIAS_FS("nfsd");
1188
1189#ifdef CONFIG_PROC_FS
1190static int create_proc_exports_entry(void)
1191{
1192 struct proc_dir_entry *entry;
1193
1194 entry = proc_mkdir("fs/nfs", NULL);
1195 if (!entry)
1196 return -ENOMEM;
1197 entry = proc_create("exports", 0, entry,
1198 &exports_proc_operations);
1199 if (!entry) {
1200 remove_proc_entry("fs/nfs", NULL);
1201 return -ENOMEM;
1202 }
1203 return 0;
1204}
1205#else /* CONFIG_PROC_FS */
1206static int create_proc_exports_entry(void)
1207{
1208 return 0;
1209}
1210#endif
1211
1212int nfsd_net_id;
1213
1214static __net_init int nfsd_init_net(struct net *net)
1215{
1216 int retval;
1217 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1218
1219 retval = nfsd_export_init(net);
1220 if (retval)
1221 goto out_export_error;
1222 retval = nfsd_idmap_init(net);
1223 if (retval)
1224 goto out_idmap_error;
1225 nn->nfsd4_lease = 90; /* default lease time */
1226 nn->nfsd4_grace = 90;
1227 return 0;
1228
1229out_idmap_error:
1230 nfsd_export_shutdown(net);
1231out_export_error:
1232 return retval;
1233}
1234
1235static __net_exit void nfsd_exit_net(struct net *net)
1236{
1237 nfsd_idmap_shutdown(net);
1238 nfsd_export_shutdown(net);
1239}
1240
1241static struct pernet_operations nfsd_net_ops = {
1242 .init = nfsd_init_net,
1243 .exit = nfsd_exit_net,
1244 .id = &nfsd_net_id,
1245 .size = sizeof(struct nfsd_net),
1246};
1247
1248static int __init init_nfsd(void)
1249{
1250 int retval;
1251 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1252
1253 retval = register_pernet_subsys(&nfsd_net_ops);
1254 if (retval < 0)
1255 return retval;
1256 retval = register_cld_notifier();
1257 if (retval)
1258 goto out_unregister_pernet;
1259 retval = nfsd4_init_slabs();
1260 if (retval)
1261 goto out_unregister_notifier;
1262 retval = nfsd4_init_pnfs();
1263 if (retval)
1264 goto out_free_slabs;
1265 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1266 if (retval)
1267 goto out_exit_pnfs;
1268 nfsd_stat_init(); /* Statistics */
1269 retval = nfsd_reply_cache_init();
1270 if (retval)
1271 goto out_free_stat;
1272 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1273 retval = create_proc_exports_entry();
1274 if (retval)
1275 goto out_free_lockd;
1276 retval = register_filesystem(&nfsd_fs_type);
1277 if (retval)
1278 goto out_free_all;
1279 return 0;
1280out_free_all:
1281 remove_proc_entry("fs/nfs/exports", NULL);
1282 remove_proc_entry("fs/nfs", NULL);
1283out_free_lockd:
1284 nfsd_lockd_shutdown();
1285 nfsd_reply_cache_shutdown();
1286out_free_stat:
1287 nfsd_stat_shutdown();
1288 nfsd_fault_inject_cleanup();
1289out_exit_pnfs:
1290 nfsd4_exit_pnfs();
1291out_free_slabs:
1292 nfsd4_free_slabs();
1293out_unregister_notifier:
1294 unregister_cld_notifier();
1295out_unregister_pernet:
1296 unregister_pernet_subsys(&nfsd_net_ops);
1297 return retval;
1298}
1299
1300static void __exit exit_nfsd(void)
1301{
1302 nfsd_reply_cache_shutdown();
1303 remove_proc_entry("fs/nfs/exports", NULL);
1304 remove_proc_entry("fs/nfs", NULL);
1305 nfsd_stat_shutdown();
1306 nfsd_lockd_shutdown();
1307 nfsd4_free_slabs();
1308 nfsd4_exit_pnfs();
1309 nfsd_fault_inject_cleanup();
1310 unregister_filesystem(&nfsd_fs_type);
1311 unregister_cld_notifier();
1312 unregister_pernet_subsys(&nfsd_net_ops);
1313}
1314
1315MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1316MODULE_LICENSE("GPL");
1317module_init(init_nfsd)
1318module_exit(exit_nfsd)