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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#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)
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)