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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};
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 __write_versions(struct file *file, char *buf, size_t size)
540{
541 char *mesg = buf;
542 char *vers, *minorp, sign;
543 int len, num, remaining;
544 unsigned minor;
545 ssize_t tlen = 0;
546 char *sep;
547 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
548
549 if (size>0) {
550 if (nn->nfsd_serv)
551 /* Cannot change versions without updating
552 * nn->nfsd_serv->sv_xdrsize, and reallocing
553 * rq_argp and rq_resp
554 */
555 return -EBUSY;
556 if (buf[size-1] != '\n')
557 return -EINVAL;
558 buf[size-1] = 0;
559
560 vers = mesg;
561 len = qword_get(&mesg, vers, size);
562 if (len <= 0) return -EINVAL;
563 do {
564 sign = *vers;
565 if (sign == '+' || sign == '-')
566 num = simple_strtol((vers+1), &minorp, 0);
567 else
568 num = simple_strtol(vers, &minorp, 0);
569 if (*minorp == '.') {
570 if (num != 4)
571 return -EINVAL;
572 minor = simple_strtoul(minorp+1, NULL, 0);
573 if (minor == 0)
574 return -EINVAL;
575 if (nfsd_minorversion(minor, sign == '-' ?
576 NFSD_CLEAR : NFSD_SET) < 0)
577 return -EINVAL;
578 goto next;
579 }
580 switch(num) {
581 case 2:
582 case 3:
583 case 4:
584 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
585 break;
586 default:
587 return -EINVAL;
588 }
589 next:
590 vers += len + 1;
591 } while ((len = qword_get(&mesg, vers, size)) > 0);
592 /* If all get turned off, turn them back on, as
593 * having no versions is BAD
594 */
595 nfsd_reset_versions();
596 }
597
598 /* Now write current state into reply buffer */
599 len = 0;
600 sep = "";
601 remaining = SIMPLE_TRANSACTION_LIMIT;
602 for (num=2 ; num <= 4 ; num++)
603 if (nfsd_vers(num, NFSD_AVAIL)) {
604 len = snprintf(buf, remaining, "%s%c%d", sep,
605 nfsd_vers(num, NFSD_TEST)?'+':'-',
606 num);
607 sep = " ";
608
609 if (len >= remaining)
610 break;
611 remaining -= len;
612 buf += len;
613 tlen += len;
614 }
615 if (nfsd_vers(4, NFSD_AVAIL))
616 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
617 minor++) {
618 len = snprintf(buf, remaining, " %c4.%u",
619 (nfsd_vers(4, NFSD_TEST) &&
620 nfsd_minorversion(minor, NFSD_TEST)) ?
621 '+' : '-',
622 minor);
623
624 if (len >= remaining)
625 break;
626 remaining -= len;
627 buf += len;
628 tlen += len;
629 }
630
631 len = snprintf(buf, remaining, "\n");
632 if (len >= remaining)
633 return -EINVAL;
634 return tlen + len;
635}
636
637/**
638 * write_versions - Set or report the available NFS protocol versions
639 *
640 * Input:
641 * buf: ignored
642 * size: zero
643 * Output:
644 * On success: passed-in buffer filled with '\n'-terminated C
645 * string containing positive or negative integer
646 * values representing the current status of each
647 * protocol version;
648 * return code is the size in bytes of the string
649 * On error: return code is zero or a negative errno value
650 *
651 * OR
652 *
653 * Input:
654 * buf: C string containing whitespace-
655 * separated positive or negative
656 * integer values representing NFS
657 * protocol versions to enable ("+n")
658 * or disable ("-n")
659 * size: non-zero length of C string in @buf
660 * Output:
661 * On success: status of zero or more protocol versions has
662 * been updated; passed-in buffer filled with
663 * '\n'-terminated C string containing positive
664 * or negative integer values representing the
665 * current status of each protocol version;
666 * return code is the size in bytes of the string
667 * On error: return code is zero or a negative errno value
668 */
669static ssize_t write_versions(struct file *file, char *buf, size_t size)
670{
671 ssize_t rv;
672
673 mutex_lock(&nfsd_mutex);
674 rv = __write_versions(file, buf, size);
675 mutex_unlock(&nfsd_mutex);
676 return rv;
677}
678
679/*
680 * Zero-length write. Return a list of NFSD's current listener
681 * transports.
682 */
683static ssize_t __write_ports_names(char *buf, struct net *net)
684{
685 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
686
687 if (nn->nfsd_serv == NULL)
688 return 0;
689 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
690}
691
692/*
693 * A single 'fd' number was written, in which case it must be for
694 * a socket of a supported family/protocol, and we use it as an
695 * nfsd listener.
696 */
697static ssize_t __write_ports_addfd(char *buf, struct net *net)
698{
699 char *mesg = buf;
700 int fd, err;
701 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
702
703 err = get_int(&mesg, &fd);
704 if (err != 0 || fd < 0)
705 return -EINVAL;
706
707 if (svc_alien_sock(net, fd)) {
708 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
709 return -EINVAL;
710 }
711
712 err = nfsd_create_serv(net);
713 if (err != 0)
714 return err;
715
716 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
717 if (err < 0) {
718 nfsd_destroy(net);
719 return err;
720 }
721
722 /* Decrease the count, but don't shut down the service */
723 nn->nfsd_serv->sv_nrthreads--;
724 return err;
725}
726
727/*
728 * A transport listener is added by writing it's transport name and
729 * a port number.
730 */
731static ssize_t __write_ports_addxprt(char *buf, struct net *net)
732{
733 char transport[16];
734 struct svc_xprt *xprt;
735 int port, err;
736 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
737
738 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
739 return -EINVAL;
740
741 if (port < 1 || port > USHRT_MAX)
742 return -EINVAL;
743
744 err = nfsd_create_serv(net);
745 if (err != 0)
746 return err;
747
748 err = svc_create_xprt(nn->nfsd_serv, transport, net,
749 PF_INET, port, SVC_SOCK_ANONYMOUS);
750 if (err < 0)
751 goto out_err;
752
753 err = svc_create_xprt(nn->nfsd_serv, transport, net,
754 PF_INET6, port, SVC_SOCK_ANONYMOUS);
755 if (err < 0 && err != -EAFNOSUPPORT)
756 goto out_close;
757
758 /* Decrease the count, but don't shut down the service */
759 nn->nfsd_serv->sv_nrthreads--;
760 return 0;
761out_close:
762 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
763 if (xprt != NULL) {
764 svc_close_xprt(xprt);
765 svc_xprt_put(xprt);
766 }
767out_err:
768 nfsd_destroy(net);
769 return err;
770}
771
772static ssize_t __write_ports(struct file *file, char *buf, size_t size,
773 struct net *net)
774{
775 if (size == 0)
776 return __write_ports_names(buf, net);
777
778 if (isdigit(buf[0]))
779 return __write_ports_addfd(buf, net);
780
781 if (isalpha(buf[0]))
782 return __write_ports_addxprt(buf, net);
783
784 return -EINVAL;
785}
786
787/**
788 * write_ports - Pass a socket file descriptor or transport name to listen on
789 *
790 * Input:
791 * buf: ignored
792 * size: zero
793 * Output:
794 * On success: passed-in buffer filled with a '\n'-terminated C
795 * string containing a whitespace-separated list of
796 * named NFSD listeners;
797 * return code is the size in bytes of the string
798 * On error: return code is zero or a negative errno value
799 *
800 * OR
801 *
802 * Input:
803 * buf: C string containing an unsigned
804 * integer value representing a bound
805 * but unconnected socket that is to be
806 * used as an NFSD listener; listen(3)
807 * must be called for a SOCK_STREAM
808 * socket, otherwise it is ignored
809 * size: non-zero length of C string in @buf
810 * Output:
811 * On success: NFS service is started;
812 * passed-in buffer filled with a '\n'-terminated C
813 * string containing a unique alphanumeric name of
814 * the listener;
815 * return code is the size in bytes of the string
816 * On error: return code is a negative errno value
817 *
818 * OR
819 *
820 * Input:
821 * buf: C string containing a transport
822 * name and an unsigned integer value
823 * representing the port to listen on,
824 * separated by whitespace
825 * size: non-zero length of C string in @buf
826 * Output:
827 * On success: returns zero; NFS service is started
828 * On error: return code is a negative errno value
829 */
830static ssize_t write_ports(struct file *file, char *buf, size_t size)
831{
832 ssize_t rv;
833
834 mutex_lock(&nfsd_mutex);
835 rv = __write_ports(file, buf, size, netns(file));
836 mutex_unlock(&nfsd_mutex);
837 return rv;
838}
839
840
841int nfsd_max_blksize;
842
843/**
844 * write_maxblksize - Set or report the current NFS blksize
845 *
846 * Input:
847 * buf: ignored
848 * size: zero
849 *
850 * OR
851 *
852 * Input:
853 * buf: C string containing an unsigned
854 * integer value representing the new
855 * NFS blksize
856 * size: non-zero length of C string in @buf
857 * Output:
858 * On success: passed-in buffer filled with '\n'-terminated C string
859 * containing numeric value of the current NFS blksize
860 * setting;
861 * return code is the size in bytes of the string
862 * On error: return code is zero or a negative errno value
863 */
864static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
865{
866 char *mesg = buf;
867 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
868
869 if (size > 0) {
870 int bsize;
871 int rv = get_int(&mesg, &bsize);
872 if (rv)
873 return rv;
874 /* force bsize into allowed range and
875 * required alignment.
876 */
877 bsize = max_t(int, bsize, 1024);
878 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
879 bsize &= ~(1024-1);
880 mutex_lock(&nfsd_mutex);
881 if (nn->nfsd_serv) {
882 mutex_unlock(&nfsd_mutex);
883 return -EBUSY;
884 }
885 nfsd_max_blksize = bsize;
886 mutex_unlock(&nfsd_mutex);
887 }
888
889 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
890 nfsd_max_blksize);
891}
892
893/**
894 * write_maxconn - Set or report the current max number of connections
895 *
896 * Input:
897 * buf: ignored
898 * size: zero
899 * OR
900 *
901 * Input:
902 * buf: C string containing an unsigned
903 * integer value representing the new
904 * number of max connections
905 * size: non-zero length of C string in @buf
906 * Output:
907 * On success: passed-in buffer filled with '\n'-terminated C string
908 * containing numeric value of max_connections setting
909 * for this net namespace;
910 * return code is the size in bytes of the string
911 * On error: return code is zero or a negative errno value
912 */
913static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
914{
915 char *mesg = buf;
916 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
917 unsigned int maxconn = nn->max_connections;
918
919 if (size > 0) {
920 int rv = get_uint(&mesg, &maxconn);
921
922 if (rv)
923 return rv;
924 nn->max_connections = maxconn;
925 }
926
927 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
928}
929
930#ifdef CONFIG_NFSD_V4
931static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
932 time_t *time, struct nfsd_net *nn)
933{
934 char *mesg = buf;
935 int rv, i;
936
937 if (size > 0) {
938 if (nn->nfsd_serv)
939 return -EBUSY;
940 rv = get_int(&mesg, &i);
941 if (rv)
942 return rv;
943 /*
944 * Some sanity checking. We don't have a reason for
945 * these particular numbers, but problems with the
946 * extremes are:
947 * - Too short: the briefest network outage may
948 * cause clients to lose all their locks. Also,
949 * the frequent polling may be wasteful.
950 * - Too long: do you really want reboot recovery
951 * to take more than an hour? Or to make other
952 * clients wait an hour before being able to
953 * revoke a dead client's locks?
954 */
955 if (i < 10 || i > 3600)
956 return -EINVAL;
957 *time = i;
958 }
959
960 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
961}
962
963static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
964 time_t *time, struct nfsd_net *nn)
965{
966 ssize_t rv;
967
968 mutex_lock(&nfsd_mutex);
969 rv = __nfsd4_write_time(file, buf, size, time, nn);
970 mutex_unlock(&nfsd_mutex);
971 return rv;
972}
973
974/**
975 * write_leasetime - Set or report the current NFSv4 lease time
976 *
977 * Input:
978 * buf: ignored
979 * size: zero
980 *
981 * OR
982 *
983 * Input:
984 * buf: C string containing an unsigned
985 * integer value representing the new
986 * NFSv4 lease expiry time
987 * size: non-zero length of C string in @buf
988 * Output:
989 * On success: passed-in buffer filled with '\n'-terminated C
990 * string containing unsigned integer value of the
991 * current lease expiry time;
992 * return code is the size in bytes of the string
993 * On error: return code is zero or a negative errno value
994 */
995static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
996{
997 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
998 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
999}
1000
1001/**
1002 * write_gracetime - Set or report current NFSv4 grace period time
1003 *
1004 * As above, but sets the time of the NFSv4 grace period.
1005 *
1006 * Note this should never be set to less than the *previous*
1007 * lease-period time, but we don't try to enforce this. (In the common
1008 * case (a new boot), we don't know what the previous lease time was
1009 * anyway.)
1010 */
1011static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1012{
1013 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1014 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1015}
1016
1017static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1018 struct nfsd_net *nn)
1019{
1020 char *mesg = buf;
1021 char *recdir;
1022 int len, status;
1023
1024 if (size > 0) {
1025 if (nn->nfsd_serv)
1026 return -EBUSY;
1027 if (size > PATH_MAX || buf[size-1] != '\n')
1028 return -EINVAL;
1029 buf[size-1] = 0;
1030
1031 recdir = mesg;
1032 len = qword_get(&mesg, recdir, size);
1033 if (len <= 0)
1034 return -EINVAL;
1035
1036 status = nfs4_reset_recoverydir(recdir);
1037 if (status)
1038 return status;
1039 }
1040
1041 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1042 nfs4_recoverydir());
1043}
1044
1045/**
1046 * write_recoverydir - Set or report the pathname of the recovery directory
1047 *
1048 * Input:
1049 * buf: ignored
1050 * size: zero
1051 *
1052 * OR
1053 *
1054 * Input:
1055 * buf: C string containing the pathname
1056 * of the directory on a local file
1057 * system containing permanent NFSv4
1058 * recovery data
1059 * size: non-zero length of C string in @buf
1060 * Output:
1061 * On success: passed-in buffer filled with '\n'-terminated C string
1062 * containing the current recovery pathname setting;
1063 * return code is the size in bytes of the string
1064 * On error: return code is zero or a negative errno value
1065 */
1066static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1067{
1068 ssize_t rv;
1069 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1070
1071 mutex_lock(&nfsd_mutex);
1072 rv = __write_recoverydir(file, buf, size, nn);
1073 mutex_unlock(&nfsd_mutex);
1074 return rv;
1075}
1076
1077/**
1078 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1079 *
1080 * Input:
1081 * buf: ignored
1082 * size: zero
1083 * OR
1084 *
1085 * Input:
1086 * buf: any value
1087 * size: non-zero length of C string in @buf
1088 * Output:
1089 * passed-in buffer filled with "Y" or "N" with a newline
1090 * and NULL-terminated C string. This indicates whether
1091 * the grace period has ended in the current net
1092 * namespace. Return code is the size in bytes of the
1093 * string. Writing a string that starts with 'Y', 'y', or
1094 * '1' to the file will end the grace period for nfsd's v4
1095 * lock manager.
1096 */
1097static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1098{
1099 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1100
1101 if (size > 0) {
1102 switch(buf[0]) {
1103 case 'Y':
1104 case 'y':
1105 case '1':
1106 nfsd4_end_grace(nn);
1107 break;
1108 default:
1109 return -EINVAL;
1110 }
1111 }
1112
1113 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1114 nn->grace_ended ? 'Y' : 'N');
1115}
1116
1117#endif
1118
1119/*----------------------------------------------------------------------------*/
1120/*
1121 * populating the filesystem.
1122 */
1123
1124static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1125{
1126 static struct tree_descr nfsd_files[] = {
1127 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1128 [NFSD_Export_features] = {"export_features",
1129 &export_features_operations, S_IRUGO},
1130 [NFSD_FO_UnlockIP] = {"unlock_ip",
1131 &transaction_ops, S_IWUSR|S_IRUSR},
1132 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1133 &transaction_ops, S_IWUSR|S_IRUSR},
1134 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1135 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1136 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1137 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1138 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1139 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1140 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1141 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1142 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1143#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1144 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1145#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1146#ifdef CONFIG_NFSD_V4
1147 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1148 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1149 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1150 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1151#endif
1152 /* last one */ {""}
1153 };
1154 get_net(sb->s_fs_info);
1155 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1156}
1157
1158static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1159 int flags, const char *dev_name, void *data)
1160{
1161 struct net *net = current->nsproxy->net_ns;
1162 return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
1163}
1164
1165static void nfsd_umount(struct super_block *sb)
1166{
1167 struct net *net = sb->s_fs_info;
1168
1169 kill_litter_super(sb);
1170 put_net(net);
1171}
1172
1173static struct file_system_type nfsd_fs_type = {
1174 .owner = THIS_MODULE,
1175 .name = "nfsd",
1176 .mount = nfsd_mount,
1177 .kill_sb = nfsd_umount,
1178};
1179MODULE_ALIAS_FS("nfsd");
1180
1181#ifdef CONFIG_PROC_FS
1182static int create_proc_exports_entry(void)
1183{
1184 struct proc_dir_entry *entry;
1185
1186 entry = proc_mkdir("fs/nfs", NULL);
1187 if (!entry)
1188 return -ENOMEM;
1189 entry = proc_create("exports", 0, entry,
1190 &exports_proc_operations);
1191 if (!entry) {
1192 remove_proc_entry("fs/nfs", NULL);
1193 return -ENOMEM;
1194 }
1195 return 0;
1196}
1197#else /* CONFIG_PROC_FS */
1198static int create_proc_exports_entry(void)
1199{
1200 return 0;
1201}
1202#endif
1203
1204unsigned int nfsd_net_id;
1205
1206static __net_init int nfsd_init_net(struct net *net)
1207{
1208 int retval;
1209 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1210
1211 retval = nfsd_export_init(net);
1212 if (retval)
1213 goto out_export_error;
1214 retval = nfsd_idmap_init(net);
1215 if (retval)
1216 goto out_idmap_error;
1217 nn->nfsd4_lease = 90; /* default lease time */
1218 nn->nfsd4_grace = 90;
1219 nn->clverifier_counter = prandom_u32();
1220 nn->clientid_counter = prandom_u32();
1221 return 0;
1222
1223out_idmap_error:
1224 nfsd_export_shutdown(net);
1225out_export_error:
1226 return retval;
1227}
1228
1229static __net_exit void nfsd_exit_net(struct net *net)
1230{
1231 nfsd_idmap_shutdown(net);
1232 nfsd_export_shutdown(net);
1233}
1234
1235static struct pernet_operations nfsd_net_ops = {
1236 .init = nfsd_init_net,
1237 .exit = nfsd_exit_net,
1238 .id = &nfsd_net_id,
1239 .size = sizeof(struct nfsd_net),
1240};
1241
1242static int __init init_nfsd(void)
1243{
1244 int retval;
1245 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1246
1247 retval = register_pernet_subsys(&nfsd_net_ops);
1248 if (retval < 0)
1249 return retval;
1250 retval = register_cld_notifier();
1251 if (retval)
1252 goto out_unregister_pernet;
1253 retval = nfsd4_init_slabs();
1254 if (retval)
1255 goto out_unregister_notifier;
1256 retval = nfsd4_init_pnfs();
1257 if (retval)
1258 goto out_free_slabs;
1259 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1260 if (retval)
1261 goto out_exit_pnfs;
1262 nfsd_stat_init(); /* Statistics */
1263 retval = nfsd_reply_cache_init();
1264 if (retval)
1265 goto out_free_stat;
1266 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1267 retval = create_proc_exports_entry();
1268 if (retval)
1269 goto out_free_lockd;
1270 retval = register_filesystem(&nfsd_fs_type);
1271 if (retval)
1272 goto out_free_all;
1273 return 0;
1274out_free_all:
1275 remove_proc_entry("fs/nfs/exports", NULL);
1276 remove_proc_entry("fs/nfs", NULL);
1277out_free_lockd:
1278 nfsd_lockd_shutdown();
1279 nfsd_reply_cache_shutdown();
1280out_free_stat:
1281 nfsd_stat_shutdown();
1282 nfsd_fault_inject_cleanup();
1283out_exit_pnfs:
1284 nfsd4_exit_pnfs();
1285out_free_slabs:
1286 nfsd4_free_slabs();
1287out_unregister_notifier:
1288 unregister_cld_notifier();
1289out_unregister_pernet:
1290 unregister_pernet_subsys(&nfsd_net_ops);
1291 return retval;
1292}
1293
1294static void __exit exit_nfsd(void)
1295{
1296 nfsd_reply_cache_shutdown();
1297 remove_proc_entry("fs/nfs/exports", NULL);
1298 remove_proc_entry("fs/nfs", NULL);
1299 nfsd_stat_shutdown();
1300 nfsd_lockd_shutdown();
1301 nfsd4_free_slabs();
1302 nfsd4_exit_pnfs();
1303 nfsd_fault_inject_cleanup();
1304 unregister_filesystem(&nfsd_fs_type);
1305 unregister_cld_notifier();
1306 unregister_pernet_subsys(&nfsd_net_ops);
1307}
1308
1309MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1310MODULE_LICENSE("GPL");
1311module_init(init_nfsd)
1312module_exit(exit_nfsd)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Syscall interface to knfsd.
4 *
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
6 */
7
8#include <linux/slab.h>
9#include <linux/namei.h>
10#include <linux/ctype.h>
11#include <linux/fs_context.h>
12
13#include <linux/sunrpc/svcsock.h>
14#include <linux/lockd/lockd.h>
15#include <linux/sunrpc/addr.h>
16#include <linux/sunrpc/gss_api.h>
17#include <linux/sunrpc/rpc_pipe_fs.h>
18#include <linux/module.h>
19#include <linux/fsnotify.h>
20
21#include "idmap.h"
22#include "nfsd.h"
23#include "cache.h"
24#include "state.h"
25#include "netns.h"
26#include "pnfs.h"
27#include "filecache.h"
28#include "trace.h"
29#include "netlink.h"
30
31/*
32 * We have a single directory with several nodes in it.
33 */
34enum {
35 NFSD_Root = 1,
36 NFSD_List,
37 NFSD_Export_Stats,
38 NFSD_Export_features,
39 NFSD_Fh,
40 NFSD_FO_UnlockIP,
41 NFSD_FO_UnlockFS,
42 NFSD_Threads,
43 NFSD_Pool_Threads,
44 NFSD_Pool_Stats,
45 NFSD_Reply_Cache_Stats,
46 NFSD_Versions,
47 NFSD_Ports,
48 NFSD_MaxBlkSize,
49 NFSD_MaxConnections,
50 NFSD_Filecache,
51#ifdef CONFIG_NFSD_V4
52 NFSD_Leasetime,
53 NFSD_Gracetime,
54 NFSD_RecoveryDir,
55 NFSD_V4EndGrace,
56#endif
57 NFSD_MaxReserved
58};
59
60/*
61 * write() for these nodes.
62 */
63static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
64static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
65static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
66static ssize_t write_threads(struct file *file, char *buf, size_t size);
67static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
68static ssize_t write_versions(struct file *file, char *buf, size_t size);
69static ssize_t write_ports(struct file *file, char *buf, size_t size);
70static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
71static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
72#ifdef CONFIG_NFSD_V4
73static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
74static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
75#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
76static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
77#endif
78static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
79#endif
80
81static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
82 [NFSD_Fh] = write_filehandle,
83 [NFSD_FO_UnlockIP] = write_unlock_ip,
84 [NFSD_FO_UnlockFS] = write_unlock_fs,
85 [NFSD_Threads] = write_threads,
86 [NFSD_Pool_Threads] = write_pool_threads,
87 [NFSD_Versions] = write_versions,
88 [NFSD_Ports] = write_ports,
89 [NFSD_MaxBlkSize] = write_maxblksize,
90 [NFSD_MaxConnections] = write_maxconn,
91#ifdef CONFIG_NFSD_V4
92 [NFSD_Leasetime] = write_leasetime,
93 [NFSD_Gracetime] = write_gracetime,
94#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
95 [NFSD_RecoveryDir] = write_recoverydir,
96#endif
97 [NFSD_V4EndGrace] = write_v4_end_grace,
98#endif
99};
100
101static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
102{
103 ino_t ino = file_inode(file)->i_ino;
104 char *data;
105 ssize_t rv;
106
107 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
108 return -EINVAL;
109
110 data = simple_transaction_get(file, buf, size);
111 if (IS_ERR(data))
112 return PTR_ERR(data);
113
114 rv = write_op[ino](file, data, size);
115 if (rv < 0)
116 return rv;
117
118 simple_transaction_set(file, rv);
119 return size;
120}
121
122static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
123{
124 if (! file->private_data) {
125 /* An attempt to read a transaction file without writing
126 * causes a 0-byte write so that the file can return
127 * state information
128 */
129 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
130 if (rv < 0)
131 return rv;
132 }
133 return simple_transaction_read(file, buf, size, pos);
134}
135
136static const struct file_operations transaction_ops = {
137 .write = nfsctl_transaction_write,
138 .read = nfsctl_transaction_read,
139 .release = simple_transaction_release,
140 .llseek = default_llseek,
141};
142
143static int exports_net_open(struct net *net, struct file *file)
144{
145 int err;
146 struct seq_file *seq;
147 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
148
149 err = seq_open(file, &nfs_exports_op);
150 if (err)
151 return err;
152
153 seq = file->private_data;
154 seq->private = nn->svc_export_cache;
155 return 0;
156}
157
158static int exports_nfsd_open(struct inode *inode, struct file *file)
159{
160 return exports_net_open(inode->i_sb->s_fs_info, file);
161}
162
163static const struct file_operations exports_nfsd_operations = {
164 .open = exports_nfsd_open,
165 .read = seq_read,
166 .llseek = seq_lseek,
167 .release = seq_release,
168};
169
170static int export_features_show(struct seq_file *m, void *v)
171{
172 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
173 return 0;
174}
175
176DEFINE_SHOW_ATTRIBUTE(export_features);
177
178static const struct file_operations pool_stats_operations = {
179 .open = nfsd_pool_stats_open,
180 .read = seq_read,
181 .llseek = seq_lseek,
182 .release = seq_release,
183};
184
185DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats);
186
187DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats);
188
189/*----------------------------------------------------------------------------*/
190/*
191 * payload - write methods
192 */
193
194static inline struct net *netns(struct file *file)
195{
196 return file_inode(file)->i_sb->s_fs_info;
197}
198
199/*
200 * write_unlock_ip - Release all locks used by a client
201 *
202 * Experimental.
203 *
204 * Input:
205 * buf: '\n'-terminated C string containing a
206 * presentation format IP address
207 * size: length of C string in @buf
208 * Output:
209 * On success: returns zero if all specified locks were released;
210 * returns one if one or more locks were not released
211 * On error: return code is negative errno value
212 */
213static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
214{
215 struct sockaddr_storage address;
216 struct sockaddr *sap = (struct sockaddr *)&address;
217 size_t salen = sizeof(address);
218 char *fo_path;
219 struct net *net = netns(file);
220
221 /* sanity check */
222 if (size == 0)
223 return -EINVAL;
224
225 if (buf[size-1] != '\n')
226 return -EINVAL;
227
228 fo_path = buf;
229 if (qword_get(&buf, fo_path, size) < 0)
230 return -EINVAL;
231
232 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
233 return -EINVAL;
234
235 trace_nfsd_ctl_unlock_ip(net, buf);
236 return nlmsvc_unlock_all_by_ip(sap);
237}
238
239/*
240 * write_unlock_fs - Release all locks on a local file system
241 *
242 * Experimental.
243 *
244 * Input:
245 * buf: '\n'-terminated C string containing the
246 * absolute pathname of a local file system
247 * size: length of C string in @buf
248 * Output:
249 * On success: returns zero if all specified locks were released;
250 * returns one if one or more locks were not released
251 * On error: return code is negative errno value
252 */
253static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
254{
255 struct path path;
256 char *fo_path;
257 int error;
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 trace_nfsd_ctl_unlock_fs(netns(file), fo_path);
270 error = kern_path(fo_path, 0, &path);
271 if (error)
272 return error;
273
274 /*
275 * XXX: Needs better sanity checking. Otherwise we could end up
276 * releasing locks on the wrong file system.
277 *
278 * For example:
279 * 1. Does the path refer to a directory?
280 * 2. Is that directory a mount point, or
281 * 3. Is that directory the root of an exported file system?
282 */
283 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
284
285 path_put(&path);
286 return error;
287}
288
289/*
290 * write_filehandle - Get a variable-length NFS file handle by path
291 *
292 * On input, the buffer contains a '\n'-terminated C string comprised of
293 * three alphanumeric words separated by whitespace. The string may
294 * contain escape sequences.
295 *
296 * Input:
297 * buf:
298 * domain: client domain name
299 * path: export pathname
300 * maxsize: numeric maximum size of
301 * @buf
302 * size: length of C string in @buf
303 * Output:
304 * On success: passed-in buffer filled with '\n'-terminated C
305 * string containing a ASCII hex text version
306 * of the NFS file handle;
307 * return code is the size in bytes of the string
308 * On error: return code is negative errno value
309 */
310static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
311{
312 char *dname, *path;
313 int maxsize;
314 char *mesg = buf;
315 int len;
316 struct auth_domain *dom;
317 struct knfsd_fh fh;
318
319 if (size == 0)
320 return -EINVAL;
321
322 if (buf[size-1] != '\n')
323 return -EINVAL;
324 buf[size-1] = 0;
325
326 dname = mesg;
327 len = qword_get(&mesg, dname, size);
328 if (len <= 0)
329 return -EINVAL;
330
331 path = dname+len+1;
332 len = qword_get(&mesg, path, size);
333 if (len <= 0)
334 return -EINVAL;
335
336 len = get_int(&mesg, &maxsize);
337 if (len)
338 return len;
339
340 if (maxsize < NFS_FHSIZE)
341 return -EINVAL;
342 maxsize = min(maxsize, NFS3_FHSIZE);
343
344 if (qword_get(&mesg, mesg, size) > 0)
345 return -EINVAL;
346
347 trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize);
348
349 /* we have all the words, they are in buf.. */
350 dom = unix_domain_find(dname);
351 if (!dom)
352 return -ENOMEM;
353
354 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
355 auth_domain_put(dom);
356 if (len)
357 return len;
358
359 mesg = buf;
360 len = SIMPLE_TRANSACTION_LIMIT;
361 qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size);
362 mesg[-1] = '\n';
363 return mesg - buf;
364}
365
366/*
367 * write_threads - Start NFSD, or report the current number of running threads
368 *
369 * Input:
370 * buf: ignored
371 * size: zero
372 * Output:
373 * On success: passed-in buffer filled with '\n'-terminated C
374 * string numeric value representing the number of
375 * running NFSD threads;
376 * return code is the size in bytes of the string
377 * On error: return code is zero
378 *
379 * OR
380 *
381 * Input:
382 * buf: C string containing an unsigned
383 * integer value representing the
384 * number of NFSD threads to start
385 * size: non-zero length of C string in @buf
386 * Output:
387 * On success: NFS service is started;
388 * passed-in buffer filled with '\n'-terminated C
389 * string numeric value representing the number of
390 * running NFSD threads;
391 * return code is the size in bytes of the string
392 * On error: return code is zero or a negative errno value
393 */
394static ssize_t write_threads(struct file *file, char *buf, size_t size)
395{
396 char *mesg = buf;
397 int rv;
398 struct net *net = netns(file);
399
400 if (size > 0) {
401 int newthreads;
402 rv = get_int(&mesg, &newthreads);
403 if (rv)
404 return rv;
405 if (newthreads < 0)
406 return -EINVAL;
407 trace_nfsd_ctl_threads(net, newthreads);
408 rv = nfsd_svc(newthreads, net, file->f_cred);
409 if (rv < 0)
410 return rv;
411 } else
412 rv = nfsd_nrthreads(net);
413
414 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
415}
416
417/*
418 * write_pool_threads - Set or report the current number of threads per pool
419 *
420 * Input:
421 * buf: ignored
422 * size: zero
423 *
424 * OR
425 *
426 * Input:
427 * buf: C string containing whitespace-
428 * separated unsigned integer values
429 * representing the number of NFSD
430 * threads to start in each pool
431 * size: non-zero length of C string in @buf
432 * Output:
433 * On success: passed-in buffer filled with '\n'-terminated C
434 * string containing integer values representing the
435 * number of NFSD threads in each pool;
436 * return code is the size in bytes of the string
437 * On error: return code is zero or a negative errno value
438 */
439static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
440{
441 /* if size > 0, look for an array of number of threads per node
442 * and apply them then write out number of threads per node as reply
443 */
444 char *mesg = buf;
445 int i;
446 int rv;
447 int len;
448 int npools;
449 int *nthreads;
450 struct net *net = netns(file);
451
452 mutex_lock(&nfsd_mutex);
453 npools = nfsd_nrpools(net);
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 trace_nfsd_ctl_pool_threads(net, i, nthreads[i]);
481 }
482 rv = nfsd_set_nrthreads(i, nthreads, net);
483 if (rv)
484 goto out_free;
485 }
486
487 rv = nfsd_get_nrthreads(npools, nthreads, net);
488 if (rv)
489 goto out_free;
490
491 mesg = buf;
492 size = SIMPLE_TRANSACTION_LIMIT;
493 for (i = 0; i < npools && size > 0; i++) {
494 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
495 len = strlen(mesg);
496 size -= len;
497 mesg += len;
498 }
499 rv = mesg - buf;
500out_free:
501 kfree(nthreads);
502 mutex_unlock(&nfsd_mutex);
503 return rv;
504}
505
506static ssize_t
507nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
508 const char *sep, unsigned vers, int minor)
509{
510 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
511 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
512
513 if (vers == 4 && minor >= 0 &&
514 !nfsd_minorversion(nn, minor, NFSD_TEST))
515 supported = false;
516 if (minor == 0 && supported)
517 /*
518 * special case for backward compatability.
519 * +4.0 is never reported, it is implied by
520 * +4, unless -4.0 is present.
521 */
522 return 0;
523 return snprintf(buf, remaining, format, sep,
524 supported ? '+' : '-', vers, minor);
525}
526
527static ssize_t __write_versions(struct file *file, char *buf, size_t size)
528{
529 char *mesg = buf;
530 char *vers, *minorp, sign;
531 int len, num, remaining;
532 ssize_t tlen = 0;
533 char *sep;
534 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
535
536 if (size > 0) {
537 if (nn->nfsd_serv)
538 /* Cannot change versions without updating
539 * nn->nfsd_serv->sv_xdrsize, and reallocing
540 * rq_argp and rq_resp
541 */
542 return -EBUSY;
543 if (buf[size-1] != '\n')
544 return -EINVAL;
545 buf[size-1] = 0;
546 trace_nfsd_ctl_version(netns(file), buf);
547
548 vers = mesg;
549 len = qword_get(&mesg, vers, size);
550 if (len <= 0) return -EINVAL;
551 do {
552 enum vers_op cmd;
553 unsigned minor;
554 sign = *vers;
555 if (sign == '+' || sign == '-')
556 num = simple_strtol((vers+1), &minorp, 0);
557 else
558 num = simple_strtol(vers, &minorp, 0);
559 if (*minorp == '.') {
560 if (num != 4)
561 return -EINVAL;
562 if (kstrtouint(minorp+1, 0, &minor) < 0)
563 return -EINVAL;
564 }
565
566 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
567 switch(num) {
568#ifdef CONFIG_NFSD_V2
569 case 2:
570#endif
571 case 3:
572 nfsd_vers(nn, num, cmd);
573 break;
574 case 4:
575 if (*minorp == '.') {
576 if (nfsd_minorversion(nn, minor, cmd) < 0)
577 return -EINVAL;
578 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
579 /*
580 * Either we have +4 and no minors are enabled,
581 * or we have -4 and at least one minor is enabled.
582 * In either case, propagate 'cmd' to all minors.
583 */
584 minor = 0;
585 while (nfsd_minorversion(nn, minor, cmd) >= 0)
586 minor++;
587 }
588 break;
589 default:
590 /* Ignore requests to disable non-existent versions */
591 if (cmd == NFSD_SET)
592 return -EINVAL;
593 }
594 vers += len + 1;
595 } while ((len = qword_get(&mesg, vers, size)) > 0);
596 /* If all get turned off, turn them back on, as
597 * having no versions is BAD
598 */
599 nfsd_reset_versions(nn);
600 }
601
602 /* Now write current state into reply buffer */
603 sep = "";
604 remaining = SIMPLE_TRANSACTION_LIMIT;
605 for (num=2 ; num <= 4 ; num++) {
606 int minor;
607 if (!nfsd_vers(nn, num, NFSD_AVAIL))
608 continue;
609
610 minor = -1;
611 do {
612 len = nfsd_print_version_support(nn, buf, remaining,
613 sep, num, minor);
614 if (len >= remaining)
615 goto out;
616 remaining -= len;
617 buf += len;
618 tlen += len;
619 minor++;
620 if (len)
621 sep = " ";
622 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
623 }
624out:
625 len = snprintf(buf, remaining, "\n");
626 if (len >= remaining)
627 return -EINVAL;
628 return tlen + len;
629}
630
631/*
632 * write_versions - Set or report the available NFS protocol versions
633 *
634 * Input:
635 * buf: ignored
636 * size: zero
637 * Output:
638 * On success: passed-in buffer filled with '\n'-terminated C
639 * string containing positive or negative integer
640 * values representing the current status of each
641 * protocol version;
642 * return code is the size in bytes of the string
643 * On error: return code is zero or a negative errno value
644 *
645 * OR
646 *
647 * Input:
648 * buf: C string containing whitespace-
649 * separated positive or negative
650 * integer values representing NFS
651 * protocol versions to enable ("+n")
652 * or disable ("-n")
653 * size: non-zero length of C string in @buf
654 * Output:
655 * On success: status of zero or more protocol versions has
656 * been updated; passed-in buffer filled with
657 * '\n'-terminated C string containing positive
658 * or negative integer values representing the
659 * current status of each protocol version;
660 * return code is the size in bytes of the string
661 * On error: return code is zero or a negative errno value
662 */
663static ssize_t write_versions(struct file *file, char *buf, size_t size)
664{
665 ssize_t rv;
666
667 mutex_lock(&nfsd_mutex);
668 rv = __write_versions(file, buf, size);
669 mutex_unlock(&nfsd_mutex);
670 return rv;
671}
672
673/*
674 * Zero-length write. Return a list of NFSD's current listener
675 * transports.
676 */
677static ssize_t __write_ports_names(char *buf, struct net *net)
678{
679 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
680
681 if (nn->nfsd_serv == NULL)
682 return 0;
683 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
684}
685
686/*
687 * A single 'fd' number was written, in which case it must be for
688 * a socket of a supported family/protocol, and we use it as an
689 * nfsd listener.
690 */
691static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
692{
693 char *mesg = buf;
694 int fd, err;
695 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
696 struct svc_serv *serv;
697
698 err = get_int(&mesg, &fd);
699 if (err != 0 || fd < 0)
700 return -EINVAL;
701 trace_nfsd_ctl_ports_addfd(net, fd);
702
703 err = nfsd_create_serv(net);
704 if (err != 0)
705 return err;
706
707 serv = nn->nfsd_serv;
708 err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
709
710 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
711 nfsd_destroy_serv(net);
712
713 return err;
714}
715
716/*
717 * A transport listener is added by writing its transport name and
718 * a port number.
719 */
720static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
721{
722 char transport[16];
723 struct svc_xprt *xprt;
724 int port, err;
725 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
726 struct svc_serv *serv;
727
728 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
729 return -EINVAL;
730
731 if (port < 1 || port > USHRT_MAX)
732 return -EINVAL;
733 trace_nfsd_ctl_ports_addxprt(net, transport, port);
734
735 err = nfsd_create_serv(net);
736 if (err != 0)
737 return err;
738
739 serv = nn->nfsd_serv;
740 err = svc_xprt_create(serv, transport, net,
741 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
742 if (err < 0)
743 goto out_err;
744
745 err = svc_xprt_create(serv, transport, net,
746 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
747 if (err < 0 && err != -EAFNOSUPPORT)
748 goto out_close;
749
750 return 0;
751out_close:
752 xprt = svc_find_xprt(serv, transport, net, PF_INET, port);
753 if (xprt != NULL) {
754 svc_xprt_close(xprt);
755 svc_xprt_put(xprt);
756 }
757out_err:
758 if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks))
759 nfsd_destroy_serv(net);
760
761 return err;
762}
763
764static ssize_t __write_ports(struct file *file, char *buf, size_t size,
765 struct net *net)
766{
767 if (size == 0)
768 return __write_ports_names(buf, net);
769
770 if (isdigit(buf[0]))
771 return __write_ports_addfd(buf, net, file->f_cred);
772
773 if (isalpha(buf[0]))
774 return __write_ports_addxprt(buf, net, file->f_cred);
775
776 return -EINVAL;
777}
778
779/*
780 * write_ports - Pass a socket file descriptor or transport name to listen on
781 *
782 * Input:
783 * buf: ignored
784 * size: zero
785 * Output:
786 * On success: passed-in buffer filled with a '\n'-terminated C
787 * string containing a whitespace-separated list of
788 * named NFSD listeners;
789 * return code is the size in bytes of the string
790 * On error: return code is zero or a negative errno value
791 *
792 * OR
793 *
794 * Input:
795 * buf: C string containing an unsigned
796 * integer value representing a bound
797 * but unconnected socket that is to be
798 * used as an NFSD listener; listen(3)
799 * must be called for a SOCK_STREAM
800 * socket, otherwise it is ignored
801 * size: non-zero length of C string in @buf
802 * Output:
803 * On success: NFS service is started;
804 * passed-in buffer filled with a '\n'-terminated C
805 * string containing a unique alphanumeric name of
806 * the listener;
807 * return code is the size in bytes of the string
808 * On error: return code is a negative errno value
809 *
810 * OR
811 *
812 * Input:
813 * buf: C string containing a transport
814 * name and an unsigned integer value
815 * representing the port to listen on,
816 * separated by whitespace
817 * size: non-zero length of C string in @buf
818 * Output:
819 * On success: returns zero; NFS service is started
820 * On error: return code is a negative errno value
821 */
822static ssize_t write_ports(struct file *file, char *buf, size_t size)
823{
824 ssize_t rv;
825
826 mutex_lock(&nfsd_mutex);
827 rv = __write_ports(file, buf, size, netns(file));
828 mutex_unlock(&nfsd_mutex);
829 return rv;
830}
831
832
833int nfsd_max_blksize;
834
835/*
836 * write_maxblksize - Set or report the current NFS blksize
837 *
838 * Input:
839 * buf: ignored
840 * size: zero
841 *
842 * OR
843 *
844 * Input:
845 * buf: C string containing an unsigned
846 * integer value representing the new
847 * NFS blksize
848 * size: non-zero length of C string in @buf
849 * Output:
850 * On success: passed-in buffer filled with '\n'-terminated C string
851 * containing numeric value of the current NFS blksize
852 * setting;
853 * return code is the size in bytes of the string
854 * On error: return code is zero or a negative errno value
855 */
856static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
857{
858 char *mesg = buf;
859 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
860
861 if (size > 0) {
862 int bsize;
863 int rv = get_int(&mesg, &bsize);
864 if (rv)
865 return rv;
866 trace_nfsd_ctl_maxblksize(netns(file), bsize);
867
868 /* force bsize into allowed range and
869 * required alignment.
870 */
871 bsize = max_t(int, bsize, 1024);
872 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
873 bsize &= ~(1024-1);
874 mutex_lock(&nfsd_mutex);
875 if (nn->nfsd_serv) {
876 mutex_unlock(&nfsd_mutex);
877 return -EBUSY;
878 }
879 nfsd_max_blksize = bsize;
880 mutex_unlock(&nfsd_mutex);
881 }
882
883 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
884 nfsd_max_blksize);
885}
886
887/*
888 * write_maxconn - Set or report the current max number of connections
889 *
890 * Input:
891 * buf: ignored
892 * size: zero
893 * OR
894 *
895 * Input:
896 * buf: C string containing an unsigned
897 * integer value representing the new
898 * number of max connections
899 * size: non-zero length of C string in @buf
900 * Output:
901 * On success: passed-in buffer filled with '\n'-terminated C string
902 * containing numeric value of max_connections setting
903 * for this net namespace;
904 * return code is the size in bytes of the string
905 * On error: return code is zero or a negative errno value
906 */
907static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
908{
909 char *mesg = buf;
910 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
911 unsigned int maxconn = nn->max_connections;
912
913 if (size > 0) {
914 int rv = get_uint(&mesg, &maxconn);
915
916 if (rv)
917 return rv;
918 trace_nfsd_ctl_maxconn(netns(file), maxconn);
919 nn->max_connections = maxconn;
920 }
921
922 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
923}
924
925#ifdef CONFIG_NFSD_V4
926static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
927 time64_t *time, struct nfsd_net *nn)
928{
929 struct dentry *dentry = file_dentry(file);
930 char *mesg = buf;
931 int rv, i;
932
933 if (size > 0) {
934 if (nn->nfsd_serv)
935 return -EBUSY;
936 rv = get_int(&mesg, &i);
937 if (rv)
938 return rv;
939 trace_nfsd_ctl_time(netns(file), dentry->d_name.name,
940 dentry->d_name.len, i);
941
942 /*
943 * Some sanity checking. We don't have a reason for
944 * these particular numbers, but problems with the
945 * extremes are:
946 * - Too short: the briefest network outage may
947 * cause clients to lose all their locks. Also,
948 * the frequent polling may be wasteful.
949 * - Too long: do you really want reboot recovery
950 * to take more than an hour? Or to make other
951 * clients wait an hour before being able to
952 * revoke a dead client's locks?
953 */
954 if (i < 10 || i > 3600)
955 return -EINVAL;
956 *time = i;
957 }
958
959 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
960}
961
962static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
963 time64_t *time, struct nfsd_net *nn)
964{
965 ssize_t rv;
966
967 mutex_lock(&nfsd_mutex);
968 rv = __nfsd4_write_time(file, buf, size, time, nn);
969 mutex_unlock(&nfsd_mutex);
970 return rv;
971}
972
973/*
974 * write_leasetime - Set or report the current NFSv4 lease time
975 *
976 * Input:
977 * buf: ignored
978 * size: zero
979 *
980 * OR
981 *
982 * Input:
983 * buf: C string containing an unsigned
984 * integer value representing the new
985 * NFSv4 lease expiry time
986 * size: non-zero length of C string in @buf
987 * Output:
988 * On success: passed-in buffer filled with '\n'-terminated C
989 * string containing unsigned integer value of the
990 * current lease expiry time;
991 * return code is the size in bytes of the string
992 * On error: return code is zero or a negative errno value
993 */
994static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
995{
996 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
997 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
998}
999
1000/*
1001 * write_gracetime - Set or report current NFSv4 grace period time
1002 *
1003 * As above, but sets the time of the NFSv4 grace period.
1004 *
1005 * Note this should never be set to less than the *previous*
1006 * lease-period time, but we don't try to enforce this. (In the common
1007 * case (a new boot), we don't know what the previous lease time was
1008 * anyway.)
1009 */
1010static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1011{
1012 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1013 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1014}
1015
1016#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
1017static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1018 struct nfsd_net *nn)
1019{
1020 char *mesg = buf;
1021 char *recdir;
1022 int len, status;
1023
1024 if (size > 0) {
1025 if (nn->nfsd_serv)
1026 return -EBUSY;
1027 if (size > PATH_MAX || buf[size-1] != '\n')
1028 return -EINVAL;
1029 buf[size-1] = 0;
1030
1031 recdir = mesg;
1032 len = qword_get(&mesg, recdir, size);
1033 if (len <= 0)
1034 return -EINVAL;
1035 trace_nfsd_ctl_recoverydir(netns(file), recdir);
1036
1037 status = nfs4_reset_recoverydir(recdir);
1038 if (status)
1039 return status;
1040 }
1041
1042 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1043 nfs4_recoverydir());
1044}
1045
1046/*
1047 * write_recoverydir - Set or report the pathname of the recovery directory
1048 *
1049 * Input:
1050 * buf: ignored
1051 * size: zero
1052 *
1053 * OR
1054 *
1055 * Input:
1056 * buf: C string containing the pathname
1057 * of the directory on a local file
1058 * system containing permanent NFSv4
1059 * recovery data
1060 * size: non-zero length of C string in @buf
1061 * Output:
1062 * On success: passed-in buffer filled with '\n'-terminated C string
1063 * containing the current recovery pathname setting;
1064 * return code is the size in bytes of the string
1065 * On error: return code is zero or a negative errno value
1066 */
1067static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1068{
1069 ssize_t rv;
1070 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1071
1072 mutex_lock(&nfsd_mutex);
1073 rv = __write_recoverydir(file, buf, size, nn);
1074 mutex_unlock(&nfsd_mutex);
1075 return rv;
1076}
1077#endif
1078
1079/*
1080 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1081 *
1082 * Input:
1083 * buf: ignored
1084 * size: zero
1085 * OR
1086 *
1087 * Input:
1088 * buf: any value
1089 * size: non-zero length of C string in @buf
1090 * Output:
1091 * passed-in buffer filled with "Y" or "N" with a newline
1092 * and NULL-terminated C string. This indicates whether
1093 * the grace period has ended in the current net
1094 * namespace. Return code is the size in bytes of the
1095 * string. Writing a string that starts with 'Y', 'y', or
1096 * '1' to the file will end the grace period for nfsd's v4
1097 * lock manager.
1098 */
1099static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1100{
1101 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1102
1103 if (size > 0) {
1104 switch(buf[0]) {
1105 case 'Y':
1106 case 'y':
1107 case '1':
1108 if (!nn->nfsd_serv)
1109 return -EBUSY;
1110 trace_nfsd_end_grace(netns(file));
1111 nfsd4_end_grace(nn);
1112 break;
1113 default:
1114 return -EINVAL;
1115 }
1116 }
1117
1118 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1119 nn->grace_ended ? 'Y' : 'N');
1120}
1121
1122#endif
1123
1124/*----------------------------------------------------------------------------*/
1125/*
1126 * populating the filesystem.
1127 */
1128
1129/* Basically copying rpc_get_inode. */
1130static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1131{
1132 struct inode *inode = new_inode(sb);
1133 if (!inode)
1134 return NULL;
1135 /* Following advice from simple_fill_super documentation: */
1136 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1137 inode->i_mode = mode;
1138 simple_inode_init_ts(inode);
1139 switch (mode & S_IFMT) {
1140 case S_IFDIR:
1141 inode->i_fop = &simple_dir_operations;
1142 inode->i_op = &simple_dir_inode_operations;
1143 inc_nlink(inode);
1144 break;
1145 case S_IFLNK:
1146 inode->i_op = &simple_symlink_inode_operations;
1147 break;
1148 default:
1149 break;
1150 }
1151 return inode;
1152}
1153
1154static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1155{
1156 struct inode *inode;
1157
1158 inode = nfsd_get_inode(dir->i_sb, mode);
1159 if (!inode)
1160 return -ENOMEM;
1161 if (ncl) {
1162 inode->i_private = ncl;
1163 kref_get(&ncl->cl_ref);
1164 }
1165 d_add(dentry, inode);
1166 inc_nlink(dir);
1167 fsnotify_mkdir(dir, dentry);
1168 return 0;
1169}
1170
1171static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1172{
1173 struct inode *dir = parent->d_inode;
1174 struct dentry *dentry;
1175 int ret = -ENOMEM;
1176
1177 inode_lock(dir);
1178 dentry = d_alloc_name(parent, name);
1179 if (!dentry)
1180 goto out_err;
1181 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1182 if (ret)
1183 goto out_err;
1184out:
1185 inode_unlock(dir);
1186 return dentry;
1187out_err:
1188 dput(dentry);
1189 dentry = ERR_PTR(ret);
1190 goto out;
1191}
1192
1193#if IS_ENABLED(CONFIG_SUNRPC_GSS)
1194static int __nfsd_symlink(struct inode *dir, struct dentry *dentry,
1195 umode_t mode, const char *content)
1196{
1197 struct inode *inode;
1198
1199 inode = nfsd_get_inode(dir->i_sb, mode);
1200 if (!inode)
1201 return -ENOMEM;
1202
1203 inode->i_link = (char *)content;
1204 inode->i_size = strlen(content);
1205
1206 d_add(dentry, inode);
1207 inc_nlink(dir);
1208 fsnotify_create(dir, dentry);
1209 return 0;
1210}
1211
1212/*
1213 * @content is assumed to be a NUL-terminated string that lives
1214 * longer than the symlink itself.
1215 */
1216static void _nfsd_symlink(struct dentry *parent, const char *name,
1217 const char *content)
1218{
1219 struct inode *dir = parent->d_inode;
1220 struct dentry *dentry;
1221 int ret;
1222
1223 inode_lock(dir);
1224 dentry = d_alloc_name(parent, name);
1225 if (!dentry)
1226 goto out;
1227 ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content);
1228 if (ret)
1229 dput(dentry);
1230out:
1231 inode_unlock(dir);
1232}
1233#else
1234static inline void _nfsd_symlink(struct dentry *parent, const char *name,
1235 const char *content)
1236{
1237}
1238
1239#endif
1240
1241static void clear_ncl(struct dentry *dentry)
1242{
1243 struct inode *inode = d_inode(dentry);
1244 struct nfsdfs_client *ncl = inode->i_private;
1245
1246 spin_lock(&inode->i_lock);
1247 inode->i_private = NULL;
1248 spin_unlock(&inode->i_lock);
1249 kref_put(&ncl->cl_ref, ncl->cl_release);
1250}
1251
1252struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1253{
1254 struct nfsdfs_client *nc;
1255
1256 spin_lock(&inode->i_lock);
1257 nc = inode->i_private;
1258 if (nc)
1259 kref_get(&nc->cl_ref);
1260 spin_unlock(&inode->i_lock);
1261 return nc;
1262}
1263
1264/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1265 * code instead. */
1266static int nfsdfs_create_files(struct dentry *root,
1267 const struct tree_descr *files,
1268 struct nfsdfs_client *ncl,
1269 struct dentry **fdentries)
1270{
1271 struct inode *dir = d_inode(root);
1272 struct inode *inode;
1273 struct dentry *dentry;
1274 int i;
1275
1276 inode_lock(dir);
1277 for (i = 0; files->name && files->name[0]; i++, files++) {
1278 dentry = d_alloc_name(root, files->name);
1279 if (!dentry)
1280 goto out;
1281 inode = nfsd_get_inode(d_inode(root)->i_sb,
1282 S_IFREG | files->mode);
1283 if (!inode) {
1284 dput(dentry);
1285 goto out;
1286 }
1287 kref_get(&ncl->cl_ref);
1288 inode->i_fop = files->ops;
1289 inode->i_private = ncl;
1290 d_add(dentry, inode);
1291 fsnotify_create(dir, dentry);
1292 if (fdentries)
1293 fdentries[i] = dentry;
1294 }
1295 inode_unlock(dir);
1296 return 0;
1297out:
1298 inode_unlock(dir);
1299 return -ENOMEM;
1300}
1301
1302/* on success, returns positive number unique to that client. */
1303struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1304 struct nfsdfs_client *ncl, u32 id,
1305 const struct tree_descr *files,
1306 struct dentry **fdentries)
1307{
1308 struct dentry *dentry;
1309 char name[11];
1310 int ret;
1311
1312 sprintf(name, "%u", id);
1313
1314 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1315 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1316 return NULL;
1317 ret = nfsdfs_create_files(dentry, files, ncl, fdentries);
1318 if (ret) {
1319 nfsd_client_rmdir(dentry);
1320 return NULL;
1321 }
1322 return dentry;
1323}
1324
1325/* Taken from __rpc_rmdir: */
1326void nfsd_client_rmdir(struct dentry *dentry)
1327{
1328 simple_recursive_removal(dentry, clear_ncl);
1329}
1330
1331static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1332{
1333 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1334 nfsd_net_id);
1335 struct dentry *dentry;
1336 int ret;
1337
1338 static const struct tree_descr nfsd_files[] = {
1339 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1340 /* Per-export io stats use same ops as exports file */
1341 [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
1342 [NFSD_Export_features] = {"export_features",
1343 &export_features_fops, S_IRUGO},
1344 [NFSD_FO_UnlockIP] = {"unlock_ip",
1345 &transaction_ops, S_IWUSR|S_IRUSR},
1346 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1347 &transaction_ops, S_IWUSR|S_IRUSR},
1348 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1349 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1350 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1351 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1352 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats",
1353 &nfsd_reply_cache_stats_fops, S_IRUGO},
1354 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1355 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1356 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1357 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1358 [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO},
1359#ifdef CONFIG_NFSD_V4
1360 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1361 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1362 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1363 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1364#endif
1365 /* last one */ {""}
1366 };
1367
1368 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1369 if (ret)
1370 return ret;
1371 _nfsd_symlink(sb->s_root, "supported_krb5_enctypes",
1372 "/proc/net/rpc/gss_krb5_enctypes");
1373 dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1374 if (IS_ERR(dentry))
1375 return PTR_ERR(dentry);
1376 nn->nfsd_client_dir = dentry;
1377 return 0;
1378}
1379
1380static int nfsd_fs_get_tree(struct fs_context *fc)
1381{
1382 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1383}
1384
1385static void nfsd_fs_free_fc(struct fs_context *fc)
1386{
1387 if (fc->s_fs_info)
1388 put_net(fc->s_fs_info);
1389}
1390
1391static const struct fs_context_operations nfsd_fs_context_ops = {
1392 .free = nfsd_fs_free_fc,
1393 .get_tree = nfsd_fs_get_tree,
1394};
1395
1396static int nfsd_init_fs_context(struct fs_context *fc)
1397{
1398 put_user_ns(fc->user_ns);
1399 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1400 fc->ops = &nfsd_fs_context_ops;
1401 return 0;
1402}
1403
1404static void nfsd_umount(struct super_block *sb)
1405{
1406 struct net *net = sb->s_fs_info;
1407
1408 nfsd_shutdown_threads(net);
1409
1410 kill_litter_super(sb);
1411 put_net(net);
1412}
1413
1414static struct file_system_type nfsd_fs_type = {
1415 .owner = THIS_MODULE,
1416 .name = "nfsd",
1417 .init_fs_context = nfsd_init_fs_context,
1418 .kill_sb = nfsd_umount,
1419};
1420MODULE_ALIAS_FS("nfsd");
1421
1422#ifdef CONFIG_PROC_FS
1423
1424static int exports_proc_open(struct inode *inode, struct file *file)
1425{
1426 return exports_net_open(current->nsproxy->net_ns, file);
1427}
1428
1429static const struct proc_ops exports_proc_ops = {
1430 .proc_open = exports_proc_open,
1431 .proc_read = seq_read,
1432 .proc_lseek = seq_lseek,
1433 .proc_release = seq_release,
1434};
1435
1436static int create_proc_exports_entry(void)
1437{
1438 struct proc_dir_entry *entry;
1439
1440 entry = proc_mkdir("fs/nfs", NULL);
1441 if (!entry)
1442 return -ENOMEM;
1443 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1444 if (!entry) {
1445 remove_proc_entry("fs/nfs", NULL);
1446 return -ENOMEM;
1447 }
1448 return 0;
1449}
1450#else /* CONFIG_PROC_FS */
1451static int create_proc_exports_entry(void)
1452{
1453 return 0;
1454}
1455#endif
1456
1457unsigned int nfsd_net_id;
1458
1459/**
1460 * nfsd_nl_rpc_status_get_start - Prepare rpc_status_get dumpit
1461 * @cb: netlink metadata and command arguments
1462 *
1463 * Return values:
1464 * %0: The rpc_status_get command may proceed
1465 * %-ENODEV: There is no NFSD running in this namespace
1466 */
1467int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
1468{
1469 struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id);
1470 int ret = -ENODEV;
1471
1472 mutex_lock(&nfsd_mutex);
1473 if (nn->nfsd_serv)
1474 ret = 0;
1475 else
1476 mutex_unlock(&nfsd_mutex);
1477
1478 return ret;
1479}
1480
1481static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb,
1482 struct netlink_callback *cb,
1483 struct nfsd_genl_rqstp *rqstp)
1484{
1485 void *hdr;
1486 u32 i;
1487
1488 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
1489 &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET);
1490 if (!hdr)
1491 return -ENOBUFS;
1492
1493 if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) ||
1494 nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) ||
1495 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) ||
1496 nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) ||
1497 nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) ||
1498 nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME,
1499 ktime_to_us(rqstp->rq_stime),
1500 NFSD_A_RPC_STATUS_PAD))
1501 return -ENOBUFS;
1502
1503 switch (rqstp->rq_saddr.sa_family) {
1504 case AF_INET: {
1505 const struct sockaddr_in *s_in, *d_in;
1506
1507 s_in = (const struct sockaddr_in *)&rqstp->rq_saddr;
1508 d_in = (const struct sockaddr_in *)&rqstp->rq_daddr;
1509 if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4,
1510 s_in->sin_addr.s_addr) ||
1511 nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4,
1512 d_in->sin_addr.s_addr) ||
1513 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1514 s_in->sin_port) ||
1515 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1516 d_in->sin_port))
1517 return -ENOBUFS;
1518 break;
1519 }
1520 case AF_INET6: {
1521 const struct sockaddr_in6 *s_in, *d_in;
1522
1523 s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr;
1524 d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr;
1525 if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6,
1526 &s_in->sin6_addr) ||
1527 nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6,
1528 &d_in->sin6_addr) ||
1529 nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT,
1530 s_in->sin6_port) ||
1531 nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT,
1532 d_in->sin6_port))
1533 return -ENOBUFS;
1534 break;
1535 }
1536 }
1537
1538 for (i = 0; i < rqstp->rq_opcnt; i++)
1539 if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS,
1540 rqstp->rq_opnum[i]))
1541 return -ENOBUFS;
1542
1543 genlmsg_end(skb, hdr);
1544 return 0;
1545}
1546
1547/**
1548 * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit
1549 * @skb: reply buffer
1550 * @cb: netlink metadata and command arguments
1551 *
1552 * Returns the size of the reply or a negative errno.
1553 */
1554int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
1555 struct netlink_callback *cb)
1556{
1557 struct nfsd_net *nn = net_generic(sock_net(skb->sk), nfsd_net_id);
1558 int i, ret, rqstp_index = 0;
1559
1560 rcu_read_lock();
1561
1562 for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) {
1563 struct svc_rqst *rqstp;
1564
1565 if (i < cb->args[0]) /* already consumed */
1566 continue;
1567
1568 rqstp_index = 0;
1569 list_for_each_entry_rcu(rqstp,
1570 &nn->nfsd_serv->sv_pools[i].sp_all_threads,
1571 rq_all) {
1572 struct nfsd_genl_rqstp genl_rqstp;
1573 unsigned int status_counter;
1574
1575 if (rqstp_index++ < cb->args[1]) /* already consumed */
1576 continue;
1577 /*
1578 * Acquire rq_status_counter before parsing the rqst
1579 * fields. rq_status_counter is set to an odd value in
1580 * order to notify the consumers the rqstp fields are
1581 * meaningful.
1582 */
1583 status_counter =
1584 smp_load_acquire(&rqstp->rq_status_counter);
1585 if (!(status_counter & 1))
1586 continue;
1587
1588 genl_rqstp.rq_xid = rqstp->rq_xid;
1589 genl_rqstp.rq_flags = rqstp->rq_flags;
1590 genl_rqstp.rq_vers = rqstp->rq_vers;
1591 genl_rqstp.rq_prog = rqstp->rq_prog;
1592 genl_rqstp.rq_proc = rqstp->rq_proc;
1593 genl_rqstp.rq_stime = rqstp->rq_stime;
1594 genl_rqstp.rq_opcnt = 0;
1595 memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
1596 sizeof(struct sockaddr));
1597 memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
1598 sizeof(struct sockaddr));
1599
1600#ifdef CONFIG_NFSD_V4
1601 if (rqstp->rq_vers == NFS4_VERSION &&
1602 rqstp->rq_proc == NFSPROC4_COMPOUND) {
1603 /* NFSv4 compound */
1604 struct nfsd4_compoundargs *args;
1605 int j;
1606
1607 args = rqstp->rq_argp;
1608 genl_rqstp.rq_opcnt = args->opcnt;
1609 for (j = 0; j < genl_rqstp.rq_opcnt; j++)
1610 genl_rqstp.rq_opnum[j] =
1611 args->ops[j].opnum;
1612 }
1613#endif /* CONFIG_NFSD_V4 */
1614
1615 /*
1616 * Acquire rq_status_counter before reporting the rqst
1617 * fields to the user.
1618 */
1619 if (smp_load_acquire(&rqstp->rq_status_counter) !=
1620 status_counter)
1621 continue;
1622
1623 ret = nfsd_genl_rpc_status_compose_msg(skb, cb,
1624 &genl_rqstp);
1625 if (ret)
1626 goto out;
1627 }
1628 }
1629
1630 cb->args[0] = i;
1631 cb->args[1] = rqstp_index;
1632 ret = skb->len;
1633out:
1634 rcu_read_unlock();
1635
1636 return ret;
1637}
1638
1639/**
1640 * nfsd_nl_rpc_status_get_done - rpc_status_get dumpit post-processing
1641 * @cb: netlink metadata and command arguments
1642 *
1643 * Return values:
1644 * %0: Success
1645 */
1646int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
1647{
1648 mutex_unlock(&nfsd_mutex);
1649
1650 return 0;
1651}
1652
1653/**
1654 * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
1655 * @net: a freshly-created network namespace
1656 *
1657 * This information stays around as long as the network namespace is
1658 * alive whether or not there is an NFSD instance running in the
1659 * namespace.
1660 *
1661 * Returns zero on success, or a negative errno otherwise.
1662 */
1663static __net_init int nfsd_net_init(struct net *net)
1664{
1665 int retval;
1666 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1667
1668 retval = nfsd_export_init(net);
1669 if (retval)
1670 goto out_export_error;
1671 retval = nfsd_idmap_init(net);
1672 if (retval)
1673 goto out_idmap_error;
1674 retval = nfsd_net_reply_cache_init(nn);
1675 if (retval)
1676 goto out_repcache_error;
1677 nn->nfsd_versions = NULL;
1678 nn->nfsd4_minorversions = NULL;
1679 nfsd4_init_leases_net(nn);
1680 get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key));
1681 seqlock_init(&nn->writeverf_lock);
1682
1683 return 0;
1684
1685out_repcache_error:
1686 nfsd_idmap_shutdown(net);
1687out_idmap_error:
1688 nfsd_export_shutdown(net);
1689out_export_error:
1690 return retval;
1691}
1692
1693/**
1694 * nfsd_net_exit - Release the nfsd_net portion of a net namespace
1695 * @net: a network namespace that is about to be destroyed
1696 *
1697 */
1698static __net_exit void nfsd_net_exit(struct net *net)
1699{
1700 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1701
1702 nfsd_net_reply_cache_destroy(nn);
1703 nfsd_idmap_shutdown(net);
1704 nfsd_export_shutdown(net);
1705 nfsd_netns_free_versions(nn);
1706}
1707
1708static struct pernet_operations nfsd_net_ops = {
1709 .init = nfsd_net_init,
1710 .exit = nfsd_net_exit,
1711 .id = &nfsd_net_id,
1712 .size = sizeof(struct nfsd_net),
1713};
1714
1715static int __init init_nfsd(void)
1716{
1717 int retval;
1718
1719 retval = nfsd4_init_slabs();
1720 if (retval)
1721 return retval;
1722 retval = nfsd4_init_pnfs();
1723 if (retval)
1724 goto out_free_slabs;
1725 retval = nfsd_stat_init(); /* Statistics */
1726 if (retval)
1727 goto out_free_pnfs;
1728 retval = nfsd_drc_slab_create();
1729 if (retval)
1730 goto out_free_stat;
1731 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1732 retval = create_proc_exports_entry();
1733 if (retval)
1734 goto out_free_lockd;
1735 retval = register_pernet_subsys(&nfsd_net_ops);
1736 if (retval < 0)
1737 goto out_free_exports;
1738 retval = register_cld_notifier();
1739 if (retval)
1740 goto out_free_subsys;
1741 retval = nfsd4_create_laundry_wq();
1742 if (retval)
1743 goto out_free_cld;
1744 retval = register_filesystem(&nfsd_fs_type);
1745 if (retval)
1746 goto out_free_all;
1747 retval = genl_register_family(&nfsd_nl_family);
1748 if (retval)
1749 goto out_free_all;
1750
1751 return 0;
1752out_free_all:
1753 nfsd4_destroy_laundry_wq();
1754out_free_cld:
1755 unregister_cld_notifier();
1756out_free_subsys:
1757 unregister_pernet_subsys(&nfsd_net_ops);
1758out_free_exports:
1759 remove_proc_entry("fs/nfs/exports", NULL);
1760 remove_proc_entry("fs/nfs", NULL);
1761out_free_lockd:
1762 nfsd_lockd_shutdown();
1763 nfsd_drc_slab_free();
1764out_free_stat:
1765 nfsd_stat_shutdown();
1766out_free_pnfs:
1767 nfsd4_exit_pnfs();
1768out_free_slabs:
1769 nfsd4_free_slabs();
1770 return retval;
1771}
1772
1773static void __exit exit_nfsd(void)
1774{
1775 genl_unregister_family(&nfsd_nl_family);
1776 unregister_filesystem(&nfsd_fs_type);
1777 nfsd4_destroy_laundry_wq();
1778 unregister_cld_notifier();
1779 unregister_pernet_subsys(&nfsd_net_ops);
1780 nfsd_drc_slab_free();
1781 remove_proc_entry("fs/nfs/exports", NULL);
1782 remove_proc_entry("fs/nfs", NULL);
1783 nfsd_stat_shutdown();
1784 nfsd_lockd_shutdown();
1785 nfsd4_free_slabs();
1786 nfsd4_exit_pnfs();
1787}
1788
1789MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1790MODULE_DESCRIPTION("In-kernel NFS server");
1791MODULE_LICENSE("GPL");
1792module_init(init_nfsd)
1793module_exit(exit_nfsd)