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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/clnt.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 "fault_inject.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_Versions,
39 NFSD_Ports,
40 NFSD_MaxBlkSize,
41 NFSD_SupportedEnctypes,
42 /*
43 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
44 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
45 */
46#ifdef CONFIG_NFSD_V4
47 NFSD_Leasetime,
48 NFSD_Gracetime,
49 NFSD_RecoveryDir,
50#endif
51};
52
53/*
54 * write() for these nodes.
55 */
56static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
57static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
58static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
59static ssize_t write_threads(struct file *file, char *buf, size_t size);
60static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
61static ssize_t write_versions(struct file *file, char *buf, size_t size);
62static ssize_t write_ports(struct file *file, char *buf, size_t size);
63static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
64#ifdef CONFIG_NFSD_V4
65static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
66static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
67static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
68#endif
69
70static ssize_t (*write_op[])(struct file *, char *, size_t) = {
71 [NFSD_Fh] = write_filehandle,
72 [NFSD_FO_UnlockIP] = write_unlock_ip,
73 [NFSD_FO_UnlockFS] = write_unlock_fs,
74 [NFSD_Threads] = write_threads,
75 [NFSD_Pool_Threads] = write_pool_threads,
76 [NFSD_Versions] = write_versions,
77 [NFSD_Ports] = write_ports,
78 [NFSD_MaxBlkSize] = write_maxblksize,
79#ifdef CONFIG_NFSD_V4
80 [NFSD_Leasetime] = write_leasetime,
81 [NFSD_Gracetime] = write_gracetime,
82 [NFSD_RecoveryDir] = write_recoverydir,
83#endif
84};
85
86static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
87{
88 ino_t ino = file->f_path.dentry->d_inode->i_ino;
89 char *data;
90 ssize_t rv;
91
92 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
93 return -EINVAL;
94
95 data = simple_transaction_get(file, buf, size);
96 if (IS_ERR(data))
97 return PTR_ERR(data);
98
99 rv = write_op[ino](file, data, size);
100 if (rv >= 0) {
101 simple_transaction_set(file, rv);
102 rv = size;
103 }
104 return rv;
105}
106
107static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
108{
109 if (! file->private_data) {
110 /* An attempt to read a transaction file without writing
111 * causes a 0-byte write so that the file can return
112 * state information
113 */
114 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
115 if (rv < 0)
116 return rv;
117 }
118 return simple_transaction_read(file, buf, size, pos);
119}
120
121static const struct file_operations transaction_ops = {
122 .write = nfsctl_transaction_write,
123 .read = nfsctl_transaction_read,
124 .release = simple_transaction_release,
125 .llseek = default_llseek,
126};
127
128static int exports_open(struct inode *inode, struct file *file)
129{
130 int err;
131 struct seq_file *seq;
132 struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
133
134 err = seq_open(file, &nfs_exports_op);
135 if (err)
136 return err;
137
138 seq = file->private_data;
139 seq->private = nn->svc_export_cache;
140 return 0;
141}
142
143static const struct file_operations exports_operations = {
144 .open = exports_open,
145 .read = seq_read,
146 .llseek = seq_lseek,
147 .release = seq_release,
148 .owner = THIS_MODULE,
149};
150
151static int export_features_show(struct seq_file *m, void *v)
152{
153 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
154 return 0;
155}
156
157static int export_features_open(struct inode *inode, struct file *file)
158{
159 return single_open(file, export_features_show, NULL);
160}
161
162static struct file_operations export_features_operations = {
163 .open = export_features_open,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = single_release,
167};
168
169#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
170static int supported_enctypes_show(struct seq_file *m, void *v)
171{
172 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
173 return 0;
174}
175
176static int supported_enctypes_open(struct inode *inode, struct file *file)
177{
178 return single_open(file, supported_enctypes_show, NULL);
179}
180
181static struct file_operations supported_enctypes_ops = {
182 .open = supported_enctypes_open,
183 .read = seq_read,
184 .llseek = seq_lseek,
185 .release = single_release,
186};
187#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
188
189extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
190extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
191
192static const struct file_operations pool_stats_operations = {
193 .open = nfsd_pool_stats_open,
194 .read = seq_read,
195 .llseek = seq_lseek,
196 .release = nfsd_pool_stats_release,
197 .owner = THIS_MODULE,
198};
199
200/*----------------------------------------------------------------------------*/
201/*
202 * payload - write methods
203 */
204
205
206/**
207 * write_unlock_ip - Release all locks used by a client
208 *
209 * Experimental.
210 *
211 * Input:
212 * buf: '\n'-terminated C string containing a
213 * presentation format IP address
214 * size: length of C string in @buf
215 * Output:
216 * On success: returns zero if all specified locks were released;
217 * returns one if one or more locks were not released
218 * On error: return code is negative errno value
219 */
220static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
221{
222 struct sockaddr_storage address;
223 struct sockaddr *sap = (struct sockaddr *)&address;
224 size_t salen = sizeof(address);
225 char *fo_path;
226
227 /* sanity check */
228 if (size == 0)
229 return -EINVAL;
230
231 if (buf[size-1] != '\n')
232 return -EINVAL;
233
234 fo_path = buf;
235 if (qword_get(&buf, fo_path, size) < 0)
236 return -EINVAL;
237
238 if (rpc_pton(&init_net, fo_path, size, sap, salen) == 0)
239 return -EINVAL;
240
241 return nlmsvc_unlock_all_by_ip(sap);
242}
243
244/**
245 * write_unlock_fs - Release all locks on a local file system
246 *
247 * Experimental.
248 *
249 * Input:
250 * buf: '\n'-terminated C string containing the
251 * absolute pathname of a local file system
252 * size: length of C string in @buf
253 * Output:
254 * On success: returns zero if all specified locks were released;
255 * returns one if one or more locks were not released
256 * On error: return code is negative errno value
257 */
258static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
259{
260 struct path path;
261 char *fo_path;
262 int error;
263
264 /* sanity check */
265 if (size == 0)
266 return -EINVAL;
267
268 if (buf[size-1] != '\n')
269 return -EINVAL;
270
271 fo_path = buf;
272 if (qword_get(&buf, fo_path, size) < 0)
273 return -EINVAL;
274
275 error = kern_path(fo_path, 0, &path);
276 if (error)
277 return error;
278
279 /*
280 * XXX: Needs better sanity checking. Otherwise we could end up
281 * releasing locks on the wrong file system.
282 *
283 * For example:
284 * 1. Does the path refer to a directory?
285 * 2. Is that directory a mount point, or
286 * 3. Is that directory the root of an exported file system?
287 */
288 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
289
290 path_put(&path);
291 return error;
292}
293
294/**
295 * write_filehandle - Get a variable-length NFS file handle by path
296 *
297 * On input, the buffer contains a '\n'-terminated C string comprised of
298 * three alphanumeric words separated by whitespace. The string may
299 * contain escape sequences.
300 *
301 * Input:
302 * buf:
303 * domain: client domain name
304 * path: export pathname
305 * maxsize: numeric maximum size of
306 * @buf
307 * size: length of C string in @buf
308 * Output:
309 * On success: passed-in buffer filled with '\n'-terminated C
310 * string containing a ASCII hex text version
311 * of the NFS file handle;
312 * return code is the size in bytes of the string
313 * On error: return code is negative errno value
314 */
315static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
316{
317 char *dname, *path;
318 int uninitialized_var(maxsize);
319 char *mesg = buf;
320 int len;
321 struct auth_domain *dom;
322 struct knfsd_fh fh;
323
324 if (size == 0)
325 return -EINVAL;
326
327 if (buf[size-1] != '\n')
328 return -EINVAL;
329 buf[size-1] = 0;
330
331 dname = mesg;
332 len = qword_get(&mesg, dname, size);
333 if (len <= 0)
334 return -EINVAL;
335
336 path = dname+len+1;
337 len = qword_get(&mesg, path, size);
338 if (len <= 0)
339 return -EINVAL;
340
341 len = get_int(&mesg, &maxsize);
342 if (len)
343 return len;
344
345 if (maxsize < NFS_FHSIZE)
346 return -EINVAL;
347 if (maxsize > NFS3_FHSIZE)
348 maxsize = NFS3_FHSIZE;
349
350 if (qword_get(&mesg, mesg, size)>0)
351 return -EINVAL;
352
353 /* we have all the words, they are in buf.. */
354 dom = unix_domain_find(dname);
355 if (!dom)
356 return -ENOMEM;
357
358 len = exp_rootfh(&init_net, dom, path, &fh, maxsize);
359 auth_domain_put(dom);
360 if (len)
361 return len;
362
363 mesg = buf;
364 len = SIMPLE_TRANSACTION_LIMIT;
365 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
366 mesg[-1] = '\n';
367 return mesg - buf;
368}
369
370/**
371 * write_threads - Start NFSD, or report the current number of running threads
372 *
373 * Input:
374 * buf: ignored
375 * size: zero
376 * Output:
377 * On success: passed-in buffer filled with '\n'-terminated C
378 * string numeric value representing the number of
379 * running NFSD threads;
380 * return code is the size in bytes of the string
381 * On error: return code is zero
382 *
383 * OR
384 *
385 * Input:
386 * buf: C string containing an unsigned
387 * integer value representing the
388 * number of NFSD threads to start
389 * size: non-zero length of C string in @buf
390 * Output:
391 * On success: NFS service is started;
392 * passed-in buffer filled with '\n'-terminated C
393 * string numeric value representing the number of
394 * running NFSD threads;
395 * return code is the size in bytes of the string
396 * On error: return code is zero or a negative errno value
397 */
398static ssize_t write_threads(struct file *file, char *buf, size_t size)
399{
400 char *mesg = buf;
401 int rv;
402 if (size > 0) {
403 int newthreads;
404 rv = get_int(&mesg, &newthreads);
405 if (rv)
406 return rv;
407 if (newthreads < 0)
408 return -EINVAL;
409 rv = nfsd_svc(NFS_PORT, newthreads);
410 if (rv < 0)
411 return rv;
412 } else
413 rv = nfsd_nrthreads();
414
415 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
416}
417
418/**
419 * write_pool_threads - Set or report the current number of threads per pool
420 *
421 * Input:
422 * buf: ignored
423 * size: zero
424 *
425 * OR
426 *
427 * Input:
428 * buf: C string containing whitespace-
429 * separated unsigned integer values
430 * representing the number of NFSD
431 * threads to start in each pool
432 * size: non-zero length of C string in @buf
433 * Output:
434 * On success: passed-in buffer filled with '\n'-terminated C
435 * string containing integer values representing the
436 * number of NFSD threads in each pool;
437 * return code is the size in bytes of the string
438 * On error: return code is zero or a negative errno value
439 */
440static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
441{
442 /* if size > 0, look for an array of number of threads per node
443 * and apply them then write out number of threads per node as reply
444 */
445 char *mesg = buf;
446 int i;
447 int rv;
448 int len;
449 int npools;
450 int *nthreads;
451
452 mutex_lock(&nfsd_mutex);
453 npools = nfsd_nrpools();
454 if (npools == 0) {
455 /*
456 * NFS is shut down. The admin can start it by
457 * writing to the threads file but NOT the pool_threads
458 * file, sorry. Report zero threads.
459 */
460 mutex_unlock(&nfsd_mutex);
461 strcpy(buf, "0\n");
462 return strlen(buf);
463 }
464
465 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
466 rv = -ENOMEM;
467 if (nthreads == NULL)
468 goto out_free;
469
470 if (size > 0) {
471 for (i = 0; i < npools; i++) {
472 rv = get_int(&mesg, &nthreads[i]);
473 if (rv == -ENOENT)
474 break; /* fewer numbers than pools */
475 if (rv)
476 goto out_free; /* syntax error */
477 rv = -EINVAL;
478 if (nthreads[i] < 0)
479 goto out_free;
480 }
481 rv = nfsd_set_nrthreads(i, nthreads);
482 if (rv)
483 goto out_free;
484 }
485
486 rv = nfsd_get_nrthreads(npools, nthreads);
487 if (rv)
488 goto out_free;
489
490 mesg = buf;
491 size = SIMPLE_TRANSACTION_LIMIT;
492 for (i = 0; i < npools && size > 0; i++) {
493 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
494 len = strlen(mesg);
495 size -= len;
496 mesg += len;
497 }
498 rv = mesg - buf;
499out_free:
500 kfree(nthreads);
501 mutex_unlock(&nfsd_mutex);
502 return rv;
503}
504
505static ssize_t __write_versions(struct file *file, char *buf, size_t size)
506{
507 char *mesg = buf;
508 char *vers, *minorp, sign;
509 int len, num, remaining;
510 unsigned minor;
511 ssize_t tlen = 0;
512 char *sep;
513
514 if (size>0) {
515 if (nfsd_serv)
516 /* Cannot change versions without updating
517 * nfsd_serv->sv_xdrsize, and reallocing
518 * rq_argp and rq_resp
519 */
520 return -EBUSY;
521 if (buf[size-1] != '\n')
522 return -EINVAL;
523 buf[size-1] = 0;
524
525 vers = mesg;
526 len = qword_get(&mesg, vers, size);
527 if (len <= 0) return -EINVAL;
528 do {
529 sign = *vers;
530 if (sign == '+' || sign == '-')
531 num = simple_strtol((vers+1), &minorp, 0);
532 else
533 num = simple_strtol(vers, &minorp, 0);
534 if (*minorp == '.') {
535 if (num < 4)
536 return -EINVAL;
537 minor = simple_strtoul(minorp+1, NULL, 0);
538 if (minor == 0)
539 return -EINVAL;
540 if (nfsd_minorversion(minor, sign == '-' ?
541 NFSD_CLEAR : NFSD_SET) < 0)
542 return -EINVAL;
543 goto next;
544 }
545 switch(num) {
546 case 2:
547 case 3:
548 case 4:
549 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
550 break;
551 default:
552 return -EINVAL;
553 }
554 next:
555 vers += len + 1;
556 } while ((len = qword_get(&mesg, vers, size)) > 0);
557 /* If all get turned off, turn them back on, as
558 * having no versions is BAD
559 */
560 nfsd_reset_versions();
561 }
562
563 /* Now write current state into reply buffer */
564 len = 0;
565 sep = "";
566 remaining = SIMPLE_TRANSACTION_LIMIT;
567 for (num=2 ; num <= 4 ; num++)
568 if (nfsd_vers(num, NFSD_AVAIL)) {
569 len = snprintf(buf, remaining, "%s%c%d", sep,
570 nfsd_vers(num, NFSD_TEST)?'+':'-',
571 num);
572 sep = " ";
573
574 if (len > remaining)
575 break;
576 remaining -= len;
577 buf += len;
578 tlen += len;
579 }
580 if (nfsd_vers(4, NFSD_AVAIL))
581 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
582 minor++) {
583 len = snprintf(buf, remaining, " %c4.%u",
584 (nfsd_vers(4, NFSD_TEST) &&
585 nfsd_minorversion(minor, NFSD_TEST)) ?
586 '+' : '-',
587 minor);
588
589 if (len > remaining)
590 break;
591 remaining -= len;
592 buf += len;
593 tlen += len;
594 }
595
596 len = snprintf(buf, remaining, "\n");
597 if (len > remaining)
598 return -EINVAL;
599 return tlen + len;
600}
601
602/**
603 * write_versions - Set or report the available NFS protocol versions
604 *
605 * Input:
606 * buf: ignored
607 * size: zero
608 * Output:
609 * On success: passed-in buffer filled with '\n'-terminated C
610 * string containing positive or negative integer
611 * values representing the current status of each
612 * protocol version;
613 * return code is the size in bytes of the string
614 * On error: return code is zero or a negative errno value
615 *
616 * OR
617 *
618 * Input:
619 * buf: C string containing whitespace-
620 * separated positive or negative
621 * integer values representing NFS
622 * protocol versions to enable ("+n")
623 * or disable ("-n")
624 * size: non-zero length of C string in @buf
625 * Output:
626 * On success: status of zero or more protocol versions has
627 * been updated; passed-in buffer filled with
628 * '\n'-terminated C string containing positive
629 * or negative integer values representing the
630 * current status of each protocol version;
631 * return code is the size in bytes of the string
632 * On error: return code is zero or a negative errno value
633 */
634static ssize_t write_versions(struct file *file, char *buf, size_t size)
635{
636 ssize_t rv;
637
638 mutex_lock(&nfsd_mutex);
639 rv = __write_versions(file, buf, size);
640 mutex_unlock(&nfsd_mutex);
641 return rv;
642}
643
644/*
645 * Zero-length write. Return a list of NFSD's current listener
646 * transports.
647 */
648static ssize_t __write_ports_names(char *buf)
649{
650 if (nfsd_serv == NULL)
651 return 0;
652 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
653}
654
655/*
656 * A single 'fd' number was written, in which case it must be for
657 * a socket of a supported family/protocol, and we use it as an
658 * nfsd listener.
659 */
660static ssize_t __write_ports_addfd(char *buf)
661{
662 char *mesg = buf;
663 int fd, err;
664 struct net *net = &init_net;
665
666 err = get_int(&mesg, &fd);
667 if (err != 0 || fd < 0)
668 return -EINVAL;
669
670 err = nfsd_create_serv();
671 if (err != 0)
672 return err;
673
674 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
675 if (err < 0) {
676 nfsd_destroy(net);
677 return err;
678 }
679
680 /* Decrease the count, but don't shut down the service */
681 nfsd_serv->sv_nrthreads--;
682 return err;
683}
684
685/*
686 * A '-' followed by the 'name' of a socket means we close the socket.
687 */
688static ssize_t __write_ports_delfd(char *buf)
689{
690 char *toclose;
691 int len = 0;
692
693 toclose = kstrdup(buf + 1, GFP_KERNEL);
694 if (toclose == NULL)
695 return -ENOMEM;
696
697 if (nfsd_serv != NULL)
698 len = svc_sock_names(nfsd_serv, buf,
699 SIMPLE_TRANSACTION_LIMIT, toclose);
700 kfree(toclose);
701 return len;
702}
703
704/*
705 * A transport listener is added by writing it's transport name and
706 * a port number.
707 */
708static ssize_t __write_ports_addxprt(char *buf)
709{
710 char transport[16];
711 struct svc_xprt *xprt;
712 int port, err;
713 struct net *net = &init_net;
714
715 if (sscanf(buf, "%15s %4u", transport, &port) != 2)
716 return -EINVAL;
717
718 if (port < 1 || port > USHRT_MAX)
719 return -EINVAL;
720
721 err = nfsd_create_serv();
722 if (err != 0)
723 return err;
724
725 err = svc_create_xprt(nfsd_serv, transport, net,
726 PF_INET, port, SVC_SOCK_ANONYMOUS);
727 if (err < 0)
728 goto out_err;
729
730 err = svc_create_xprt(nfsd_serv, transport, net,
731 PF_INET6, port, SVC_SOCK_ANONYMOUS);
732 if (err < 0 && err != -EAFNOSUPPORT)
733 goto out_close;
734
735 /* Decrease the count, but don't shut down the service */
736 nfsd_serv->sv_nrthreads--;
737 return 0;
738out_close:
739 xprt = svc_find_xprt(nfsd_serv, transport, net, PF_INET, port);
740 if (xprt != NULL) {
741 svc_close_xprt(xprt);
742 svc_xprt_put(xprt);
743 }
744out_err:
745 nfsd_destroy(net);
746 return err;
747}
748
749/*
750 * A transport listener is removed by writing a "-", it's transport
751 * name, and it's port number.
752 */
753static ssize_t __write_ports_delxprt(char *buf)
754{
755 struct svc_xprt *xprt;
756 char transport[16];
757 int port;
758
759 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
760 return -EINVAL;
761
762 if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL)
763 return -EINVAL;
764
765 xprt = svc_find_xprt(nfsd_serv, transport, &init_net, AF_UNSPEC, port);
766 if (xprt == NULL)
767 return -ENOTCONN;
768
769 svc_close_xprt(xprt);
770 svc_xprt_put(xprt);
771 return 0;
772}
773
774static ssize_t __write_ports(struct file *file, char *buf, size_t size)
775{
776 if (size == 0)
777 return __write_ports_names(buf);
778
779 if (isdigit(buf[0]))
780 return __write_ports_addfd(buf);
781
782 if (buf[0] == '-' && isdigit(buf[1]))
783 return __write_ports_delfd(buf);
784
785 if (isalpha(buf[0]))
786 return __write_ports_addxprt(buf);
787
788 if (buf[0] == '-' && isalpha(buf[1]))
789 return __write_ports_delxprt(buf);
790
791 return -EINVAL;
792}
793
794/**
795 * write_ports - Pass a socket file descriptor or transport name to listen on
796 *
797 * Input:
798 * buf: ignored
799 * size: zero
800 * Output:
801 * On success: passed-in buffer filled with a '\n'-terminated C
802 * string containing a whitespace-separated list of
803 * named NFSD listeners;
804 * return code is the size in bytes of the string
805 * On error: return code is zero or a negative errno value
806 *
807 * OR
808 *
809 * Input:
810 * buf: C string containing an unsigned
811 * integer value representing a bound
812 * but unconnected socket that is to be
813 * used as an NFSD listener; listen(3)
814 * must be called for a SOCK_STREAM
815 * socket, otherwise it is ignored
816 * size: non-zero length of C string in @buf
817 * Output:
818 * On success: NFS service is started;
819 * passed-in buffer filled with a '\n'-terminated C
820 * string containing a unique alphanumeric name of
821 * 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 "-" followed
829 * by an integer value representing a
830 * previously passed in socket file
831 * descriptor
832 * size: non-zero length of C string in @buf
833 * Output:
834 * On success: NFS service no longer listens on that socket;
835 * passed-in buffer filled with a '\n'-terminated C
836 * string containing a unique name of the listener;
837 * return code is the size in bytes of the string
838 * On error: return code is a negative errno value
839 *
840 * OR
841 *
842 * Input:
843 * buf: C string containing a transport
844 * name and an unsigned integer value
845 * representing the port to listen on,
846 * separated by whitespace
847 * size: non-zero length of C string in @buf
848 * Output:
849 * On success: returns zero; NFS service is started
850 * On error: return code is a negative errno value
851 *
852 * OR
853 *
854 * Input:
855 * buf: C string containing a "-" followed
856 * by a transport name and an unsigned
857 * integer value representing the port
858 * to listen on, separated by whitespace
859 * size: non-zero length of C string in @buf
860 * Output:
861 * On success: returns zero; NFS service no longer listens
862 * on that transport
863 * On error: return code is a negative errno value
864 */
865static ssize_t write_ports(struct file *file, char *buf, size_t size)
866{
867 ssize_t rv;
868
869 mutex_lock(&nfsd_mutex);
870 rv = __write_ports(file, buf, size);
871 mutex_unlock(&nfsd_mutex);
872 return rv;
873}
874
875
876int nfsd_max_blksize;
877
878/**
879 * write_maxblksize - Set or report the current NFS blksize
880 *
881 * Input:
882 * buf: ignored
883 * size: zero
884 *
885 * OR
886 *
887 * Input:
888 * buf: C string containing an unsigned
889 * integer value representing the new
890 * NFS blksize
891 * size: non-zero length of C string in @buf
892 * Output:
893 * On success: passed-in buffer filled with '\n'-terminated C string
894 * containing numeric value of the current NFS blksize
895 * setting;
896 * return code is the size in bytes of the string
897 * On error: return code is zero or a negative errno value
898 */
899static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
900{
901 char *mesg = buf;
902 if (size > 0) {
903 int bsize;
904 int rv = get_int(&mesg, &bsize);
905 if (rv)
906 return rv;
907 /* force bsize into allowed range and
908 * required alignment.
909 */
910 if (bsize < 1024)
911 bsize = 1024;
912 if (bsize > NFSSVC_MAXBLKSIZE)
913 bsize = NFSSVC_MAXBLKSIZE;
914 bsize &= ~(1024-1);
915 mutex_lock(&nfsd_mutex);
916 if (nfsd_serv) {
917 mutex_unlock(&nfsd_mutex);
918 return -EBUSY;
919 }
920 nfsd_max_blksize = bsize;
921 mutex_unlock(&nfsd_mutex);
922 }
923
924 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
925 nfsd_max_blksize);
926}
927
928#ifdef CONFIG_NFSD_V4
929static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
930{
931 char *mesg = buf;
932 int rv, i;
933
934 if (size > 0) {
935 if (nfsd_serv)
936 return -EBUSY;
937 rv = get_int(&mesg, &i);
938 if (rv)
939 return rv;
940 /*
941 * Some sanity checking. We don't have a reason for
942 * these particular numbers, but problems with the
943 * extremes are:
944 * - Too short: the briefest network outage may
945 * cause clients to lose all their locks. Also,
946 * the frequent polling may be wasteful.
947 * - Too long: do you really want reboot recovery
948 * to take more than an hour? Or to make other
949 * clients wait an hour before being able to
950 * revoke a dead client's locks?
951 */
952 if (i < 10 || i > 3600)
953 return -EINVAL;
954 *time = i;
955 }
956
957 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
958}
959
960static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time)
961{
962 ssize_t rv;
963
964 mutex_lock(&nfsd_mutex);
965 rv = __nfsd4_write_time(file, buf, size, time);
966 mutex_unlock(&nfsd_mutex);
967 return rv;
968}
969
970/**
971 * write_leasetime - Set or report the current NFSv4 lease time
972 *
973 * Input:
974 * buf: ignored
975 * size: zero
976 *
977 * OR
978 *
979 * Input:
980 * buf: C string containing an unsigned
981 * integer value representing the new
982 * NFSv4 lease expiry time
983 * size: non-zero length of C string in @buf
984 * Output:
985 * On success: passed-in buffer filled with '\n'-terminated C
986 * string containing unsigned integer value of the
987 * current lease expiry time;
988 * return code is the size in bytes of the string
989 * On error: return code is zero or a negative errno value
990 */
991static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
992{
993 return nfsd4_write_time(file, buf, size, &nfsd4_lease);
994}
995
996/**
997 * write_gracetime - Set or report current NFSv4 grace period time
998 *
999 * As above, but sets the time of the NFSv4 grace period.
1000 *
1001 * Note this should never be set to less than the *previous*
1002 * lease-period time, but we don't try to enforce this. (In the common
1003 * case (a new boot), we don't know what the previous lease time was
1004 * anyway.)
1005 */
1006static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1007{
1008 return nfsd4_write_time(file, buf, size, &nfsd4_grace);
1009}
1010
1011extern char *nfs4_recoverydir(void);
1012
1013static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1014{
1015 char *mesg = buf;
1016 char *recdir;
1017 int len, status;
1018
1019 if (size > 0) {
1020 if (nfsd_serv)
1021 return -EBUSY;
1022 if (size > PATH_MAX || buf[size-1] != '\n')
1023 return -EINVAL;
1024 buf[size-1] = 0;
1025
1026 recdir = mesg;
1027 len = qword_get(&mesg, recdir, size);
1028 if (len <= 0)
1029 return -EINVAL;
1030
1031 status = nfs4_reset_recoverydir(recdir);
1032 if (status)
1033 return status;
1034 }
1035
1036 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1037 nfs4_recoverydir());
1038}
1039
1040/**
1041 * write_recoverydir - Set or report the pathname of the recovery directory
1042 *
1043 * Input:
1044 * buf: ignored
1045 * size: zero
1046 *
1047 * OR
1048 *
1049 * Input:
1050 * buf: C string containing the pathname
1051 * of the directory on a local file
1052 * system containing permanent NFSv4
1053 * recovery data
1054 * size: non-zero length of C string in @buf
1055 * Output:
1056 * On success: passed-in buffer filled with '\n'-terminated C string
1057 * containing the current recovery pathname setting;
1058 * return code is the size in bytes of the string
1059 * On error: return code is zero or a negative errno value
1060 */
1061static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1062{
1063 ssize_t rv;
1064
1065 mutex_lock(&nfsd_mutex);
1066 rv = __write_recoverydir(file, buf, size);
1067 mutex_unlock(&nfsd_mutex);
1068 return rv;
1069}
1070
1071#endif
1072
1073/*----------------------------------------------------------------------------*/
1074/*
1075 * populating the filesystem.
1076 */
1077
1078static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1079{
1080 static struct tree_descr nfsd_files[] = {
1081 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1082 [NFSD_Export_features] = {"export_features",
1083 &export_features_operations, S_IRUGO},
1084 [NFSD_FO_UnlockIP] = {"unlock_ip",
1085 &transaction_ops, S_IWUSR|S_IRUSR},
1086 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1087 &transaction_ops, S_IWUSR|S_IRUSR},
1088 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1089 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1090 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1091 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1092 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1093 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1094 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1095#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1096 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1097#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1098#ifdef CONFIG_NFSD_V4
1099 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1100 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1101 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1102#endif
1103 /* last one */ {""}
1104 };
1105 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1106}
1107
1108static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1109 int flags, const char *dev_name, void *data)
1110{
1111 return mount_single(fs_type, flags, data, nfsd_fill_super);
1112}
1113
1114static struct file_system_type nfsd_fs_type = {
1115 .owner = THIS_MODULE,
1116 .name = "nfsd",
1117 .mount = nfsd_mount,
1118 .kill_sb = kill_litter_super,
1119};
1120
1121#ifdef CONFIG_PROC_FS
1122static int create_proc_exports_entry(void)
1123{
1124 struct proc_dir_entry *entry;
1125
1126 entry = proc_mkdir("fs/nfs", NULL);
1127 if (!entry)
1128 return -ENOMEM;
1129 entry = proc_create("exports", 0, entry, &exports_operations);
1130 if (!entry)
1131 return -ENOMEM;
1132 return 0;
1133}
1134#else /* CONFIG_PROC_FS */
1135static int create_proc_exports_entry(void)
1136{
1137 return 0;
1138}
1139#endif
1140
1141int nfsd_net_id;
1142
1143static __net_init int nfsd_init_net(struct net *net)
1144{
1145 int retval;
1146
1147 retval = nfsd_export_init(net);
1148 if (retval)
1149 goto out_export_error;
1150 retval = nfsd_idmap_init(net);
1151 if (retval)
1152 goto out_idmap_error;
1153 return 0;
1154
1155out_idmap_error:
1156 nfsd_export_shutdown(net);
1157out_export_error:
1158 return retval;
1159}
1160
1161static __net_exit void nfsd_exit_net(struct net *net)
1162{
1163 nfsd_idmap_shutdown(net);
1164 nfsd_export_shutdown(net);
1165}
1166
1167static struct pernet_operations nfsd_net_ops = {
1168 .init = nfsd_init_net,
1169 .exit = nfsd_exit_net,
1170 .id = &nfsd_net_id,
1171 .size = sizeof(struct nfsd_net),
1172};
1173
1174static int __init init_nfsd(void)
1175{
1176 int retval;
1177 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1178
1179 retval = register_cld_notifier();
1180 if (retval)
1181 return retval;
1182 retval = register_pernet_subsys(&nfsd_net_ops);
1183 if (retval < 0)
1184 goto out_unregister_notifier;
1185 retval = nfsd4_init_slabs();
1186 if (retval)
1187 goto out_unregister_pernet;
1188 nfs4_state_init();
1189 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1190 if (retval)
1191 goto out_free_slabs;
1192 nfsd_stat_init(); /* Statistics */
1193 retval = nfsd_reply_cache_init();
1194 if (retval)
1195 goto out_free_stat;
1196 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1197 retval = create_proc_exports_entry();
1198 if (retval)
1199 goto out_free_lockd;
1200 retval = register_filesystem(&nfsd_fs_type);
1201 if (retval)
1202 goto out_free_all;
1203 return 0;
1204out_free_all:
1205 remove_proc_entry("fs/nfs/exports", NULL);
1206 remove_proc_entry("fs/nfs", NULL);
1207out_free_lockd:
1208 nfsd_lockd_shutdown();
1209 nfsd_reply_cache_shutdown();
1210out_free_stat:
1211 nfsd_stat_shutdown();
1212 nfsd_fault_inject_cleanup();
1213out_free_slabs:
1214 nfsd4_free_slabs();
1215out_unregister_pernet:
1216 unregister_pernet_subsys(&nfsd_net_ops);
1217out_unregister_notifier:
1218 unregister_cld_notifier();
1219 return retval;
1220}
1221
1222static void __exit exit_nfsd(void)
1223{
1224 nfsd_reply_cache_shutdown();
1225 remove_proc_entry("fs/nfs/exports", NULL);
1226 remove_proc_entry("fs/nfs", NULL);
1227 nfsd_stat_shutdown();
1228 nfsd_lockd_shutdown();
1229 nfsd4_free_slabs();
1230 nfsd_fault_inject_cleanup();
1231 unregister_filesystem(&nfsd_fs_type);
1232 unregister_pernet_subsys(&nfsd_net_ops);
1233 unregister_cld_notifier();
1234}
1235
1236MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1237MODULE_LICENSE("GPL");
1238module_init(init_nfsd)
1239module_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};
162
163static int exports_nfsd_open(struct inode *inode, struct file *file)
164{
165 return exports_net_open(inode->i_sb->s_fs_info, file);
166}
167
168static const struct file_operations exports_nfsd_operations = {
169 .open = exports_nfsd_open,
170 .read = seq_read,
171 .llseek = seq_lseek,
172 .release = seq_release,
173};
174
175static int export_features_show(struct seq_file *m, void *v)
176{
177 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
178 return 0;
179}
180
181static int export_features_open(struct inode *inode, struct file *file)
182{
183 return single_open(file, export_features_show, NULL);
184}
185
186static const struct file_operations export_features_operations = {
187 .open = export_features_open,
188 .read = seq_read,
189 .llseek = seq_lseek,
190 .release = single_release,
191};
192
193#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
194static int supported_enctypes_show(struct seq_file *m, void *v)
195{
196 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
197 return 0;
198}
199
200static int supported_enctypes_open(struct inode *inode, struct file *file)
201{
202 return single_open(file, supported_enctypes_show, NULL);
203}
204
205static const struct file_operations supported_enctypes_ops = {
206 .open = supported_enctypes_open,
207 .read = seq_read,
208 .llseek = seq_lseek,
209 .release = single_release,
210};
211#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
212
213static const struct file_operations pool_stats_operations = {
214 .open = nfsd_pool_stats_open,
215 .read = seq_read,
216 .llseek = seq_lseek,
217 .release = nfsd_pool_stats_release,
218};
219
220static const struct file_operations reply_cache_stats_operations = {
221 .open = nfsd_reply_cache_stats_open,
222 .read = seq_read,
223 .llseek = seq_lseek,
224 .release = single_release,
225};
226
227/*----------------------------------------------------------------------------*/
228/*
229 * payload - write methods
230 */
231
232static inline struct net *netns(struct file *file)
233{
234 return file_inode(file)->i_sb->s_fs_info;
235}
236
237/**
238 * write_unlock_ip - Release all locks used by a client
239 *
240 * Experimental.
241 *
242 * Input:
243 * buf: '\n'-terminated C string containing a
244 * presentation format IP address
245 * size: length of C string in @buf
246 * Output:
247 * On success: returns zero if all specified locks were released;
248 * returns one if one or more locks were not released
249 * On error: return code is negative errno value
250 */
251static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
252{
253 struct sockaddr_storage address;
254 struct sockaddr *sap = (struct sockaddr *)&address;
255 size_t salen = sizeof(address);
256 char *fo_path;
257 struct net *net = netns(file);
258
259 /* sanity check */
260 if (size == 0)
261 return -EINVAL;
262
263 if (buf[size-1] != '\n')
264 return -EINVAL;
265
266 fo_path = buf;
267 if (qword_get(&buf, fo_path, size) < 0)
268 return -EINVAL;
269
270 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
271 return -EINVAL;
272
273 return nlmsvc_unlock_all_by_ip(sap);
274}
275
276/**
277 * write_unlock_fs - Release all locks on a local file system
278 *
279 * Experimental.
280 *
281 * Input:
282 * buf: '\n'-terminated C string containing the
283 * absolute pathname of a local file system
284 * size: length of C string in @buf
285 * Output:
286 * On success: returns zero if all specified locks were released;
287 * returns one if one or more locks were not released
288 * On error: return code is negative errno value
289 */
290static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
291{
292 struct path path;
293 char *fo_path;
294 int error;
295
296 /* sanity check */
297 if (size == 0)
298 return -EINVAL;
299
300 if (buf[size-1] != '\n')
301 return -EINVAL;
302
303 fo_path = buf;
304 if (qword_get(&buf, fo_path, size) < 0)
305 return -EINVAL;
306
307 error = kern_path(fo_path, 0, &path);
308 if (error)
309 return error;
310
311 /*
312 * XXX: Needs better sanity checking. Otherwise we could end up
313 * releasing locks on the wrong file system.
314 *
315 * For example:
316 * 1. Does the path refer to a directory?
317 * 2. Is that directory a mount point, or
318 * 3. Is that directory the root of an exported file system?
319 */
320 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
321
322 path_put(&path);
323 return error;
324}
325
326/**
327 * write_filehandle - Get a variable-length NFS file handle by path
328 *
329 * On input, the buffer contains a '\n'-terminated C string comprised of
330 * three alphanumeric words separated by whitespace. The string may
331 * contain escape sequences.
332 *
333 * Input:
334 * buf:
335 * domain: client domain name
336 * path: export pathname
337 * maxsize: numeric maximum size of
338 * @buf
339 * size: length of C string in @buf
340 * Output:
341 * On success: passed-in buffer filled with '\n'-terminated C
342 * string containing a ASCII hex text version
343 * of the NFS file handle;
344 * return code is the size in bytes of the string
345 * On error: return code is negative errno value
346 */
347static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
348{
349 char *dname, *path;
350 int uninitialized_var(maxsize);
351 char *mesg = buf;
352 int len;
353 struct auth_domain *dom;
354 struct knfsd_fh fh;
355
356 if (size == 0)
357 return -EINVAL;
358
359 if (buf[size-1] != '\n')
360 return -EINVAL;
361 buf[size-1] = 0;
362
363 dname = mesg;
364 len = qword_get(&mesg, dname, size);
365 if (len <= 0)
366 return -EINVAL;
367
368 path = dname+len+1;
369 len = qword_get(&mesg, path, size);
370 if (len <= 0)
371 return -EINVAL;
372
373 len = get_int(&mesg, &maxsize);
374 if (len)
375 return len;
376
377 if (maxsize < NFS_FHSIZE)
378 return -EINVAL;
379 maxsize = min(maxsize, NFS3_FHSIZE);
380
381 if (qword_get(&mesg, mesg, size)>0)
382 return -EINVAL;
383
384 /* we have all the words, they are in buf.. */
385 dom = unix_domain_find(dname);
386 if (!dom)
387 return -ENOMEM;
388
389 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
390 auth_domain_put(dom);
391 if (len)
392 return len;
393
394 mesg = buf;
395 len = SIMPLE_TRANSACTION_LIMIT;
396 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
397 mesg[-1] = '\n';
398 return mesg - buf;
399}
400
401/**
402 * write_threads - Start NFSD, or report the current number of running threads
403 *
404 * Input:
405 * buf: ignored
406 * size: zero
407 * Output:
408 * On success: passed-in buffer filled with '\n'-terminated C
409 * string numeric value representing the number of
410 * running NFSD threads;
411 * return code is the size in bytes of the string
412 * On error: return code is zero
413 *
414 * OR
415 *
416 * Input:
417 * buf: C string containing an unsigned
418 * integer value representing the
419 * number of NFSD threads to start
420 * size: non-zero length of C string in @buf
421 * Output:
422 * On success: NFS service is started;
423 * passed-in buffer filled with '\n'-terminated C
424 * string numeric value representing the number of
425 * running NFSD threads;
426 * return code is the size in bytes of the string
427 * On error: return code is zero or a negative errno value
428 */
429static ssize_t write_threads(struct file *file, char *buf, size_t size)
430{
431 char *mesg = buf;
432 int rv;
433 struct net *net = netns(file);
434
435 if (size > 0) {
436 int newthreads;
437 rv = get_int(&mesg, &newthreads);
438 if (rv)
439 return rv;
440 if (newthreads < 0)
441 return -EINVAL;
442 rv = nfsd_svc(newthreads, net);
443 if (rv < 0)
444 return rv;
445 } else
446 rv = nfsd_nrthreads(net);
447
448 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
449}
450
451/**
452 * write_pool_threads - Set or report the current number of threads per pool
453 *
454 * Input:
455 * buf: ignored
456 * size: zero
457 *
458 * OR
459 *
460 * Input:
461 * buf: C string containing whitespace-
462 * separated unsigned integer values
463 * representing the number of NFSD
464 * threads to start in each pool
465 * size: non-zero length of C string in @buf
466 * Output:
467 * On success: passed-in buffer filled with '\n'-terminated C
468 * string containing integer values representing the
469 * number of NFSD threads in each pool;
470 * return code is the size in bytes of the string
471 * On error: return code is zero or a negative errno value
472 */
473static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
474{
475 /* if size > 0, look for an array of number of threads per node
476 * and apply them then write out number of threads per node as reply
477 */
478 char *mesg = buf;
479 int i;
480 int rv;
481 int len;
482 int npools;
483 int *nthreads;
484 struct net *net = netns(file);
485
486 mutex_lock(&nfsd_mutex);
487 npools = nfsd_nrpools(net);
488 if (npools == 0) {
489 /*
490 * NFS is shut down. The admin can start it by
491 * writing to the threads file but NOT the pool_threads
492 * file, sorry. Report zero threads.
493 */
494 mutex_unlock(&nfsd_mutex);
495 strcpy(buf, "0\n");
496 return strlen(buf);
497 }
498
499 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
500 rv = -ENOMEM;
501 if (nthreads == NULL)
502 goto out_free;
503
504 if (size > 0) {
505 for (i = 0; i < npools; i++) {
506 rv = get_int(&mesg, &nthreads[i]);
507 if (rv == -ENOENT)
508 break; /* fewer numbers than pools */
509 if (rv)
510 goto out_free; /* syntax error */
511 rv = -EINVAL;
512 if (nthreads[i] < 0)
513 goto out_free;
514 }
515 rv = nfsd_set_nrthreads(i, nthreads, net);
516 if (rv)
517 goto out_free;
518 }
519
520 rv = nfsd_get_nrthreads(npools, nthreads, net);
521 if (rv)
522 goto out_free;
523
524 mesg = buf;
525 size = SIMPLE_TRANSACTION_LIMIT;
526 for (i = 0; i < npools && size > 0; i++) {
527 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
528 len = strlen(mesg);
529 size -= len;
530 mesg += len;
531 }
532 rv = mesg - buf;
533out_free:
534 kfree(nthreads);
535 mutex_unlock(&nfsd_mutex);
536 return rv;
537}
538
539static ssize_t
540nfsd_print_version_support(char *buf, int remaining, const char *sep,
541 unsigned vers, int minor)
542{
543 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
544 bool supported = !!nfsd_vers(vers, NFSD_TEST);
545
546 if (vers == 4 && minor >= 0 &&
547 !nfsd_minorversion(minor, NFSD_TEST))
548 supported = false;
549 if (minor == 0 && supported)
550 /*
551 * special case for backward compatability.
552 * +4.0 is never reported, it is implied by
553 * +4, unless -4.0 is present.
554 */
555 return 0;
556 return snprintf(buf, remaining, format, sep,
557 supported ? '+' : '-', vers, minor);
558}
559
560static ssize_t __write_versions(struct file *file, char *buf, size_t size)
561{
562 char *mesg = buf;
563 char *vers, *minorp, sign;
564 int len, num, remaining;
565 ssize_t tlen = 0;
566 char *sep;
567 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
568
569 if (size>0) {
570 if (nn->nfsd_serv)
571 /* Cannot change versions without updating
572 * nn->nfsd_serv->sv_xdrsize, and reallocing
573 * rq_argp and rq_resp
574 */
575 return -EBUSY;
576 if (buf[size-1] != '\n')
577 return -EINVAL;
578 buf[size-1] = 0;
579
580 vers = mesg;
581 len = qword_get(&mesg, vers, size);
582 if (len <= 0) return -EINVAL;
583 do {
584 enum vers_op cmd;
585 unsigned minor;
586 sign = *vers;
587 if (sign == '+' || sign == '-')
588 num = simple_strtol((vers+1), &minorp, 0);
589 else
590 num = simple_strtol(vers, &minorp, 0);
591 if (*minorp == '.') {
592 if (num != 4)
593 return -EINVAL;
594 if (kstrtouint(minorp+1, 0, &minor) < 0)
595 return -EINVAL;
596 }
597
598 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
599 switch(num) {
600 case 2:
601 case 3:
602 nfsd_vers(num, cmd);
603 break;
604 case 4:
605 if (*minorp == '.') {
606 if (nfsd_minorversion(minor, cmd) < 0)
607 return -EINVAL;
608 } else if ((cmd == NFSD_SET) != nfsd_vers(num, NFSD_TEST)) {
609 /*
610 * Either we have +4 and no minors are enabled,
611 * or we have -4 and at least one minor is enabled.
612 * In either case, propagate 'cmd' to all minors.
613 */
614 minor = 0;
615 while (nfsd_minorversion(minor, cmd) >= 0)
616 minor++;
617 }
618 break;
619 default:
620 return -EINVAL;
621 }
622 vers += len + 1;
623 } while ((len = qword_get(&mesg, vers, size)) > 0);
624 /* If all get turned off, turn them back on, as
625 * having no versions is BAD
626 */
627 nfsd_reset_versions();
628 }
629
630 /* Now write current state into reply buffer */
631 len = 0;
632 sep = "";
633 remaining = SIMPLE_TRANSACTION_LIMIT;
634 for (num=2 ; num <= 4 ; num++) {
635 int minor;
636 if (!nfsd_vers(num, NFSD_AVAIL))
637 continue;
638
639 minor = -1;
640 do {
641 len = nfsd_print_version_support(buf, remaining,
642 sep, num, minor);
643 if (len >= remaining)
644 goto out;
645 remaining -= len;
646 buf += len;
647 tlen += len;
648 minor++;
649 if (len)
650 sep = " ";
651 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
652 }
653out:
654 len = snprintf(buf, remaining, "\n");
655 if (len >= remaining)
656 return -EINVAL;
657 return tlen + len;
658}
659
660/**
661 * write_versions - Set or report the available NFS protocol versions
662 *
663 * Input:
664 * buf: ignored
665 * size: zero
666 * Output:
667 * On success: passed-in buffer filled with '\n'-terminated C
668 * string containing positive or negative integer
669 * values representing the current status of each
670 * protocol version;
671 * return code is the size in bytes of the string
672 * On error: return code is zero or a negative errno value
673 *
674 * OR
675 *
676 * Input:
677 * buf: C string containing whitespace-
678 * separated positive or negative
679 * integer values representing NFS
680 * protocol versions to enable ("+n")
681 * or disable ("-n")
682 * size: non-zero length of C string in @buf
683 * Output:
684 * On success: status of zero or more protocol versions has
685 * been updated; passed-in buffer filled with
686 * '\n'-terminated C string containing positive
687 * or negative integer values representing the
688 * current status of each protocol version;
689 * return code is the size in bytes of the string
690 * On error: return code is zero or a negative errno value
691 */
692static ssize_t write_versions(struct file *file, char *buf, size_t size)
693{
694 ssize_t rv;
695
696 mutex_lock(&nfsd_mutex);
697 rv = __write_versions(file, buf, size);
698 mutex_unlock(&nfsd_mutex);
699 return rv;
700}
701
702/*
703 * Zero-length write. Return a list of NFSD's current listener
704 * transports.
705 */
706static ssize_t __write_ports_names(char *buf, struct net *net)
707{
708 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
709
710 if (nn->nfsd_serv == NULL)
711 return 0;
712 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
713}
714
715/*
716 * A single 'fd' number was written, in which case it must be for
717 * a socket of a supported family/protocol, and we use it as an
718 * nfsd listener.
719 */
720static ssize_t __write_ports_addfd(char *buf, struct net *net)
721{
722 char *mesg = buf;
723 int fd, err;
724 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
725
726 err = get_int(&mesg, &fd);
727 if (err != 0 || fd < 0)
728 return -EINVAL;
729
730 if (svc_alien_sock(net, fd)) {
731 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
732 return -EINVAL;
733 }
734
735 err = nfsd_create_serv(net);
736 if (err != 0)
737 return err;
738
739 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
740 if (err < 0) {
741 nfsd_destroy(net);
742 return err;
743 }
744
745 /* Decrease the count, but don't shut down the service */
746 nn->nfsd_serv->sv_nrthreads--;
747 return err;
748}
749
750/*
751 * A transport listener is added by writing it's transport name and
752 * a port number.
753 */
754static ssize_t __write_ports_addxprt(char *buf, struct net *net)
755{
756 char transport[16];
757 struct svc_xprt *xprt;
758 int port, err;
759 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
760
761 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
762 return -EINVAL;
763
764 if (port < 1 || port > USHRT_MAX)
765 return -EINVAL;
766
767 err = nfsd_create_serv(net);
768 if (err != 0)
769 return err;
770
771 err = svc_create_xprt(nn->nfsd_serv, transport, net,
772 PF_INET, port, SVC_SOCK_ANONYMOUS);
773 if (err < 0)
774 goto out_err;
775
776 err = svc_create_xprt(nn->nfsd_serv, transport, net,
777 PF_INET6, port, SVC_SOCK_ANONYMOUS);
778 if (err < 0 && err != -EAFNOSUPPORT)
779 goto out_close;
780
781 /* Decrease the count, but don't shut down the service */
782 nn->nfsd_serv->sv_nrthreads--;
783 return 0;
784out_close:
785 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
786 if (xprt != NULL) {
787 svc_close_xprt(xprt);
788 svc_xprt_put(xprt);
789 }
790out_err:
791 nfsd_destroy(net);
792 return err;
793}
794
795static ssize_t __write_ports(struct file *file, char *buf, size_t size,
796 struct net *net)
797{
798 if (size == 0)
799 return __write_ports_names(buf, net);
800
801 if (isdigit(buf[0]))
802 return __write_ports_addfd(buf, net);
803
804 if (isalpha(buf[0]))
805 return __write_ports_addxprt(buf, net);
806
807 return -EINVAL;
808}
809
810/**
811 * write_ports - Pass a socket file descriptor or transport name to listen on
812 *
813 * Input:
814 * buf: ignored
815 * size: zero
816 * Output:
817 * On success: passed-in buffer filled with a '\n'-terminated C
818 * string containing a whitespace-separated list of
819 * named NFSD listeners;
820 * return code is the size in bytes of the string
821 * On error: return code is zero or a negative errno value
822 *
823 * OR
824 *
825 * Input:
826 * buf: C string containing an unsigned
827 * integer value representing a bound
828 * but unconnected socket that is to be
829 * used as an NFSD listener; listen(3)
830 * must be called for a SOCK_STREAM
831 * socket, otherwise it is ignored
832 * size: non-zero length of C string in @buf
833 * Output:
834 * On success: NFS service is started;
835 * passed-in buffer filled with a '\n'-terminated C
836 * string containing a unique alphanumeric name of
837 * the listener;
838 * return code is the size in bytes of the string
839 * On error: return code is a negative errno value
840 *
841 * OR
842 *
843 * Input:
844 * buf: C string containing a transport
845 * name and an unsigned integer value
846 * representing the port to listen on,
847 * separated by whitespace
848 * size: non-zero length of C string in @buf
849 * Output:
850 * On success: returns zero; NFS service is started
851 * On error: return code is a negative errno value
852 */
853static ssize_t write_ports(struct file *file, char *buf, size_t size)
854{
855 ssize_t rv;
856
857 mutex_lock(&nfsd_mutex);
858 rv = __write_ports(file, buf, size, netns(file));
859 mutex_unlock(&nfsd_mutex);
860 return rv;
861}
862
863
864int nfsd_max_blksize;
865
866/**
867 * write_maxblksize - Set or report the current NFS blksize
868 *
869 * Input:
870 * buf: ignored
871 * size: zero
872 *
873 * OR
874 *
875 * Input:
876 * buf: C string containing an unsigned
877 * integer value representing the new
878 * NFS blksize
879 * size: non-zero length of C string in @buf
880 * Output:
881 * On success: passed-in buffer filled with '\n'-terminated C string
882 * containing numeric value of the current NFS blksize
883 * setting;
884 * return code is the size in bytes of the string
885 * On error: return code is zero or a negative errno value
886 */
887static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
888{
889 char *mesg = buf;
890 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
891
892 if (size > 0) {
893 int bsize;
894 int rv = get_int(&mesg, &bsize);
895 if (rv)
896 return rv;
897 /* force bsize into allowed range and
898 * required alignment.
899 */
900 bsize = max_t(int, bsize, 1024);
901 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
902 bsize &= ~(1024-1);
903 mutex_lock(&nfsd_mutex);
904 if (nn->nfsd_serv) {
905 mutex_unlock(&nfsd_mutex);
906 return -EBUSY;
907 }
908 nfsd_max_blksize = bsize;
909 mutex_unlock(&nfsd_mutex);
910 }
911
912 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
913 nfsd_max_blksize);
914}
915
916/**
917 * write_maxconn - Set or report the current max number of connections
918 *
919 * Input:
920 * buf: ignored
921 * size: zero
922 * OR
923 *
924 * Input:
925 * buf: C string containing an unsigned
926 * integer value representing the new
927 * number of max connections
928 * size: non-zero length of C string in @buf
929 * Output:
930 * On success: passed-in buffer filled with '\n'-terminated C string
931 * containing numeric value of max_connections setting
932 * for this net namespace;
933 * return code is the size in bytes of the string
934 * On error: return code is zero or a negative errno value
935 */
936static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
937{
938 char *mesg = buf;
939 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
940 unsigned int maxconn = nn->max_connections;
941
942 if (size > 0) {
943 int rv = get_uint(&mesg, &maxconn);
944
945 if (rv)
946 return rv;
947 nn->max_connections = maxconn;
948 }
949
950 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
951}
952
953#ifdef CONFIG_NFSD_V4
954static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
955 time_t *time, struct nfsd_net *nn)
956{
957 char *mesg = buf;
958 int rv, i;
959
960 if (size > 0) {
961 if (nn->nfsd_serv)
962 return -EBUSY;
963 rv = get_int(&mesg, &i);
964 if (rv)
965 return rv;
966 /*
967 * Some sanity checking. We don't have a reason for
968 * these particular numbers, but problems with the
969 * extremes are:
970 * - Too short: the briefest network outage may
971 * cause clients to lose all their locks. Also,
972 * the frequent polling may be wasteful.
973 * - Too long: do you really want reboot recovery
974 * to take more than an hour? Or to make other
975 * clients wait an hour before being able to
976 * revoke a dead client's locks?
977 */
978 if (i < 10 || i > 3600)
979 return -EINVAL;
980 *time = i;
981 }
982
983 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
984}
985
986static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
987 time_t *time, struct nfsd_net *nn)
988{
989 ssize_t rv;
990
991 mutex_lock(&nfsd_mutex);
992 rv = __nfsd4_write_time(file, buf, size, time, nn);
993 mutex_unlock(&nfsd_mutex);
994 return rv;
995}
996
997/**
998 * write_leasetime - Set or report the current NFSv4 lease time
999 *
1000 * Input:
1001 * buf: ignored
1002 * size: zero
1003 *
1004 * OR
1005 *
1006 * Input:
1007 * buf: C string containing an unsigned
1008 * integer value representing the new
1009 * NFSv4 lease expiry time
1010 * size: non-zero length of C string in @buf
1011 * Output:
1012 * On success: passed-in buffer filled with '\n'-terminated C
1013 * string containing unsigned integer value of the
1014 * current lease expiry time;
1015 * return code is the size in bytes of the string
1016 * On error: return code is zero or a negative errno value
1017 */
1018static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1019{
1020 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1021 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1022}
1023
1024/**
1025 * write_gracetime - Set or report current NFSv4 grace period time
1026 *
1027 * As above, but sets the time of the NFSv4 grace period.
1028 *
1029 * Note this should never be set to less than the *previous*
1030 * lease-period time, but we don't try to enforce this. (In the common
1031 * case (a new boot), we don't know what the previous lease time was
1032 * anyway.)
1033 */
1034static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1035{
1036 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1037 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1038}
1039
1040static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1041 struct nfsd_net *nn)
1042{
1043 char *mesg = buf;
1044 char *recdir;
1045 int len, status;
1046
1047 if (size > 0) {
1048 if (nn->nfsd_serv)
1049 return -EBUSY;
1050 if (size > PATH_MAX || buf[size-1] != '\n')
1051 return -EINVAL;
1052 buf[size-1] = 0;
1053
1054 recdir = mesg;
1055 len = qword_get(&mesg, recdir, size);
1056 if (len <= 0)
1057 return -EINVAL;
1058
1059 status = nfs4_reset_recoverydir(recdir);
1060 if (status)
1061 return status;
1062 }
1063
1064 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1065 nfs4_recoverydir());
1066}
1067
1068/**
1069 * write_recoverydir - Set or report the pathname of the recovery directory
1070 *
1071 * Input:
1072 * buf: ignored
1073 * size: zero
1074 *
1075 * OR
1076 *
1077 * Input:
1078 * buf: C string containing the pathname
1079 * of the directory on a local file
1080 * system containing permanent NFSv4
1081 * recovery data
1082 * size: non-zero length of C string in @buf
1083 * Output:
1084 * On success: passed-in buffer filled with '\n'-terminated C string
1085 * containing the current recovery pathname setting;
1086 * return code is the size in bytes of the string
1087 * On error: return code is zero or a negative errno value
1088 */
1089static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1090{
1091 ssize_t rv;
1092 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1093
1094 mutex_lock(&nfsd_mutex);
1095 rv = __write_recoverydir(file, buf, size, nn);
1096 mutex_unlock(&nfsd_mutex);
1097 return rv;
1098}
1099
1100/**
1101 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1102 *
1103 * Input:
1104 * buf: ignored
1105 * size: zero
1106 * OR
1107 *
1108 * Input:
1109 * buf: any value
1110 * size: non-zero length of C string in @buf
1111 * Output:
1112 * passed-in buffer filled with "Y" or "N" with a newline
1113 * and NULL-terminated C string. This indicates whether
1114 * the grace period has ended in the current net
1115 * namespace. Return code is the size in bytes of the
1116 * string. Writing a string that starts with 'Y', 'y', or
1117 * '1' to the file will end the grace period for nfsd's v4
1118 * lock manager.
1119 */
1120static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1121{
1122 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1123
1124 if (size > 0) {
1125 switch(buf[0]) {
1126 case 'Y':
1127 case 'y':
1128 case '1':
1129 nfsd4_end_grace(nn);
1130 break;
1131 default:
1132 return -EINVAL;
1133 }
1134 }
1135
1136 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1137 nn->grace_ended ? 'Y' : 'N');
1138}
1139
1140#endif
1141
1142/*----------------------------------------------------------------------------*/
1143/*
1144 * populating the filesystem.
1145 */
1146
1147static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1148{
1149 static const struct tree_descr nfsd_files[] = {
1150 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1151 [NFSD_Export_features] = {"export_features",
1152 &export_features_operations, S_IRUGO},
1153 [NFSD_FO_UnlockIP] = {"unlock_ip",
1154 &transaction_ops, S_IWUSR|S_IRUSR},
1155 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1156 &transaction_ops, S_IWUSR|S_IRUSR},
1157 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1158 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1159 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1160 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1161 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1162 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1163 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1164 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1165 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1166#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1167 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1168#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1169#ifdef CONFIG_NFSD_V4
1170 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1171 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1172 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1173 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1174#endif
1175 /* last one */ {""}
1176 };
1177 get_net(sb->s_fs_info);
1178 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1179}
1180
1181static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1182 int flags, const char *dev_name, void *data)
1183{
1184 struct net *net = current->nsproxy->net_ns;
1185 return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1186}
1187
1188static void nfsd_umount(struct super_block *sb)
1189{
1190 struct net *net = sb->s_fs_info;
1191
1192 kill_litter_super(sb);
1193 put_net(net);
1194}
1195
1196static struct file_system_type nfsd_fs_type = {
1197 .owner = THIS_MODULE,
1198 .name = "nfsd",
1199 .mount = nfsd_mount,
1200 .kill_sb = nfsd_umount,
1201};
1202MODULE_ALIAS_FS("nfsd");
1203
1204#ifdef CONFIG_PROC_FS
1205static int create_proc_exports_entry(void)
1206{
1207 struct proc_dir_entry *entry;
1208
1209 entry = proc_mkdir("fs/nfs", NULL);
1210 if (!entry)
1211 return -ENOMEM;
1212 entry = proc_create("exports", 0, entry,
1213 &exports_proc_operations);
1214 if (!entry) {
1215 remove_proc_entry("fs/nfs", NULL);
1216 return -ENOMEM;
1217 }
1218 return 0;
1219}
1220#else /* CONFIG_PROC_FS */
1221static int create_proc_exports_entry(void)
1222{
1223 return 0;
1224}
1225#endif
1226
1227unsigned int nfsd_net_id;
1228
1229static __net_init int nfsd_init_net(struct net *net)
1230{
1231 int retval;
1232 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1233
1234 retval = nfsd_export_init(net);
1235 if (retval)
1236 goto out_export_error;
1237 retval = nfsd_idmap_init(net);
1238 if (retval)
1239 goto out_idmap_error;
1240 nn->nfsd4_lease = 90; /* default lease time */
1241 nn->nfsd4_grace = 90;
1242 nn->clverifier_counter = prandom_u32();
1243 nn->clientid_counter = prandom_u32();
1244
1245 atomic_set(&nn->ntf_refcnt, 0);
1246 init_waitqueue_head(&nn->ntf_wq);
1247 return 0;
1248
1249out_idmap_error:
1250 nfsd_export_shutdown(net);
1251out_export_error:
1252 return retval;
1253}
1254
1255static __net_exit void nfsd_exit_net(struct net *net)
1256{
1257 nfsd_idmap_shutdown(net);
1258 nfsd_export_shutdown(net);
1259}
1260
1261static struct pernet_operations nfsd_net_ops = {
1262 .init = nfsd_init_net,
1263 .exit = nfsd_exit_net,
1264 .id = &nfsd_net_id,
1265 .size = sizeof(struct nfsd_net),
1266};
1267
1268static int __init init_nfsd(void)
1269{
1270 int retval;
1271 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1272
1273 retval = register_pernet_subsys(&nfsd_net_ops);
1274 if (retval < 0)
1275 return retval;
1276 retval = register_cld_notifier();
1277 if (retval)
1278 goto out_unregister_pernet;
1279 retval = nfsd4_init_slabs();
1280 if (retval)
1281 goto out_unregister_notifier;
1282 retval = nfsd4_init_pnfs();
1283 if (retval)
1284 goto out_free_slabs;
1285 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1286 if (retval)
1287 goto out_exit_pnfs;
1288 nfsd_stat_init(); /* Statistics */
1289 retval = nfsd_reply_cache_init();
1290 if (retval)
1291 goto out_free_stat;
1292 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1293 retval = create_proc_exports_entry();
1294 if (retval)
1295 goto out_free_lockd;
1296 retval = register_filesystem(&nfsd_fs_type);
1297 if (retval)
1298 goto out_free_all;
1299 return 0;
1300out_free_all:
1301 remove_proc_entry("fs/nfs/exports", NULL);
1302 remove_proc_entry("fs/nfs", NULL);
1303out_free_lockd:
1304 nfsd_lockd_shutdown();
1305 nfsd_reply_cache_shutdown();
1306out_free_stat:
1307 nfsd_stat_shutdown();
1308 nfsd_fault_inject_cleanup();
1309out_exit_pnfs:
1310 nfsd4_exit_pnfs();
1311out_free_slabs:
1312 nfsd4_free_slabs();
1313out_unregister_notifier:
1314 unregister_cld_notifier();
1315out_unregister_pernet:
1316 unregister_pernet_subsys(&nfsd_net_ops);
1317 return retval;
1318}
1319
1320static void __exit exit_nfsd(void)
1321{
1322 nfsd_reply_cache_shutdown();
1323 remove_proc_entry("fs/nfs/exports", NULL);
1324 remove_proc_entry("fs/nfs", NULL);
1325 nfsd_stat_shutdown();
1326 nfsd_lockd_shutdown();
1327 nfsd4_free_slabs();
1328 nfsd4_exit_pnfs();
1329 nfsd_fault_inject_cleanup();
1330 unregister_filesystem(&nfsd_fs_type);
1331 unregister_cld_notifier();
1332 unregister_pernet_subsys(&nfsd_net_ops);
1333}
1334
1335MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1336MODULE_LICENSE("GPL");
1337module_init(init_nfsd)
1338module_exit(exit_nfsd)