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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfsd / nfsctl.c
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/nfsd_idmap.h>
12 #include <linux/sunrpc/svcsock.h>
13 #include <linux/nfsd/syscall.h>
14 #include <linux/lockd/lockd.h>
15 #include <linux/sunrpc/clnt.h>
16
17 #include "nfsd.h"
18 #include "cache.h"
19
20 /*
21 * We have a single directory with 9 nodes in it.
22 */
23 enum {
24 NFSD_Root = 1,
25 NFSD_Svc,
26 NFSD_Add,
27 NFSD_Del,
28 NFSD_Export,
29 NFSD_Unexport,
30 NFSD_Getfd,
31 NFSD_Getfs,
32 NFSD_List,
33 NFSD_Export_features,
34 NFSD_Fh,
35 NFSD_FO_UnlockIP,
36 NFSD_FO_UnlockFS,
37 NFSD_Threads,
38 NFSD_Pool_Threads,
39 NFSD_Pool_Stats,
40 NFSD_Versions,
41 NFSD_Ports,
42 NFSD_MaxBlkSize,
43 /*
44 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
45 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
46 */
47 #ifdef CONFIG_NFSD_V4
48 NFSD_Leasetime,
49 NFSD_RecoveryDir,
50 #endif
51 };
52
53 /*
54 * write() for these nodes.
55 */
56 static ssize_t write_svc(struct file *file, char *buf, size_t size);
57 static ssize_t write_add(struct file *file, char *buf, size_t size);
58 static ssize_t write_del(struct file *file, char *buf, size_t size);
59 static ssize_t write_export(struct file *file, char *buf, size_t size);
60 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
61 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
62 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
63 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
64 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
65 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
66 static ssize_t write_threads(struct file *file, char *buf, size_t size);
67 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
68 static ssize_t write_versions(struct file *file, char *buf, size_t size);
69 static ssize_t write_ports(struct file *file, char *buf, size_t size);
70 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
71 #ifdef CONFIG_NFSD_V4
72 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
73 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
74 #endif
75
76 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
77 [NFSD_Svc] = write_svc,
78 [NFSD_Add] = write_add,
79 [NFSD_Del] = write_del,
80 [NFSD_Export] = write_export,
81 [NFSD_Unexport] = write_unexport,
82 [NFSD_Getfd] = write_getfd,
83 [NFSD_Getfs] = write_getfs,
84 [NFSD_Fh] = write_filehandle,
85 [NFSD_FO_UnlockIP] = write_unlock_ip,
86 [NFSD_FO_UnlockFS] = write_unlock_fs,
87 [NFSD_Threads] = write_threads,
88 [NFSD_Pool_Threads] = write_pool_threads,
89 [NFSD_Versions] = write_versions,
90 [NFSD_Ports] = write_ports,
91 [NFSD_MaxBlkSize] = write_maxblksize,
92 #ifdef CONFIG_NFSD_V4
93 [NFSD_Leasetime] = write_leasetime,
94 [NFSD_RecoveryDir] = write_recoverydir,
95 #endif
96 };
97
98 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
99 {
100 ino_t ino = file->f_path.dentry->d_inode->i_ino;
101 char *data;
102 ssize_t rv;
103
104 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
105 return -EINVAL;
106
107 data = simple_transaction_get(file, buf, size);
108 if (IS_ERR(data))
109 return PTR_ERR(data);
110
111 rv = write_op[ino](file, data, size);
112 if (rv >= 0) {
113 simple_transaction_set(file, rv);
114 rv = size;
115 }
116 return rv;
117 }
118
119 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
120 {
121 if (! file->private_data) {
122 /* An attempt to read a transaction file without writing
123 * causes a 0-byte write so that the file can return
124 * state information
125 */
126 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
127 if (rv < 0)
128 return rv;
129 }
130 return simple_transaction_read(file, buf, size, pos);
131 }
132
133 static const struct file_operations transaction_ops = {
134 .write = nfsctl_transaction_write,
135 .read = nfsctl_transaction_read,
136 .release = simple_transaction_release,
137 };
138
139 static int exports_open(struct inode *inode, struct file *file)
140 {
141 return seq_open(file, &nfs_exports_op);
142 }
143
144 static const struct file_operations exports_operations = {
145 .open = exports_open,
146 .read = seq_read,
147 .llseek = seq_lseek,
148 .release = seq_release,
149 .owner = THIS_MODULE,
150 };
151
152 static int export_features_show(struct seq_file *m, void *v)
153 {
154 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
155 return 0;
156 }
157
158 static int export_features_open(struct inode *inode, struct file *file)
159 {
160 return single_open(file, export_features_show, NULL);
161 }
162
163 static struct file_operations export_features_operations = {
164 .open = export_features_open,
165 .read = seq_read,
166 .llseek = seq_lseek,
167 .release = single_release,
168 };
169
170 extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
171 extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
172
173 static const struct file_operations pool_stats_operations = {
174 .open = nfsd_pool_stats_open,
175 .read = seq_read,
176 .llseek = seq_lseek,
177 .release = nfsd_pool_stats_release,
178 .owner = THIS_MODULE,
179 };
180
181 /*----------------------------------------------------------------------------*/
182 /*
183 * payload - write methods
184 */
185
186 /**
187 * write_svc - Start kernel's NFSD server
188 *
189 * Deprecated. /proc/fs/nfsd/threads is preferred.
190 * Function remains to support old versions of nfs-utils.
191 *
192 * Input:
193 * buf: struct nfsctl_svc
194 * svc_port: port number of this
195 * server's listener
196 * svc_nthreads: number of threads to start
197 * size: size in bytes of passed in nfsctl_svc
198 * Output:
199 * On success: returns zero
200 * On error: return code is negative errno value
201 */
202 static ssize_t write_svc(struct file *file, char *buf, size_t size)
203 {
204 struct nfsctl_svc *data;
205 int err;
206 if (size < sizeof(*data))
207 return -EINVAL;
208 data = (struct nfsctl_svc*) buf;
209 err = nfsd_svc(data->svc_port, data->svc_nthreads);
210 if (err < 0)
211 return err;
212 return 0;
213 }
214
215 /**
216 * write_add - Add or modify client entry in auth unix cache
217 *
218 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
219 * Function remains to support old versions of nfs-utils.
220 *
221 * Input:
222 * buf: struct nfsctl_client
223 * cl_ident: '\0'-terminated C string
224 * containing domain name
225 * of client
226 * cl_naddr: no. of items in cl_addrlist
227 * cl_addrlist: array of client addresses
228 * cl_fhkeytype: ignored
229 * cl_fhkeylen: ignored
230 * cl_fhkey: ignored
231 * size: size in bytes of passed in nfsctl_client
232 * Output:
233 * On success: returns zero
234 * On error: return code is negative errno value
235 *
236 * Note: Only AF_INET client addresses are passed in, since
237 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
238 */
239 static ssize_t write_add(struct file *file, char *buf, size_t size)
240 {
241 struct nfsctl_client *data;
242 if (size < sizeof(*data))
243 return -EINVAL;
244 data = (struct nfsctl_client *)buf;
245 return exp_addclient(data);
246 }
247
248 /**
249 * write_del - Remove client from auth unix cache
250 *
251 * Deprecated. /proc/net/rpc/auth.unix.ip is preferred.
252 * Function remains to support old versions of nfs-utils.
253 *
254 * Input:
255 * buf: struct nfsctl_client
256 * cl_ident: '\0'-terminated C string
257 * containing domain name
258 * of client
259 * cl_naddr: ignored
260 * cl_addrlist: ignored
261 * cl_fhkeytype: ignored
262 * cl_fhkeylen: ignored
263 * cl_fhkey: ignored
264 * size: size in bytes of passed in nfsctl_client
265 * Output:
266 * On success: returns zero
267 * On error: return code is negative errno value
268 *
269 * Note: Only AF_INET client addresses are passed in, since
270 * nfsctl_client.cl_addrlist contains only in_addr fields for addresses.
271 */
272 static ssize_t write_del(struct file *file, char *buf, size_t size)
273 {
274 struct nfsctl_client *data;
275 if (size < sizeof(*data))
276 return -EINVAL;
277 data = (struct nfsctl_client *)buf;
278 return exp_delclient(data);
279 }
280
281 /**
282 * write_export - Export part or all of a local file system
283 *
284 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
285 * Function remains to support old versions of nfs-utils.
286 *
287 * Input:
288 * buf: struct nfsctl_export
289 * ex_client: '\0'-terminated C string
290 * containing domain name
291 * of client allowed to access
292 * this export
293 * ex_path: '\0'-terminated C string
294 * containing pathname of
295 * directory in local file system
296 * ex_dev: fsid to use for this export
297 * ex_ino: ignored
298 * ex_flags: export flags for this export
299 * ex_anon_uid: UID to use for anonymous
300 * requests
301 * ex_anon_gid: GID to use for anonymous
302 * requests
303 * size: size in bytes of passed in nfsctl_export
304 * Output:
305 * On success: returns zero
306 * On error: return code is negative errno value
307 */
308 static ssize_t write_export(struct file *file, char *buf, size_t size)
309 {
310 struct nfsctl_export *data;
311 if (size < sizeof(*data))
312 return -EINVAL;
313 data = (struct nfsctl_export*)buf;
314 return exp_export(data);
315 }
316
317 /**
318 * write_unexport - Unexport a previously exported file system
319 *
320 * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred.
321 * Function remains to support old versions of nfs-utils.
322 *
323 * Input:
324 * buf: struct nfsctl_export
325 * ex_client: '\0'-terminated C string
326 * containing domain name
327 * of client no longer allowed
328 * to access this export
329 * ex_path: '\0'-terminated C string
330 * containing pathname of
331 * directory in local file system
332 * ex_dev: ignored
333 * ex_ino: ignored
334 * ex_flags: ignored
335 * ex_anon_uid: ignored
336 * ex_anon_gid: ignored
337 * size: size in bytes of passed in nfsctl_export
338 * Output:
339 * On success: returns zero
340 * On error: return code is negative errno value
341 */
342 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
343 {
344 struct nfsctl_export *data;
345
346 if (size < sizeof(*data))
347 return -EINVAL;
348 data = (struct nfsctl_export*)buf;
349 return exp_unexport(data);
350 }
351
352 /**
353 * write_getfs - Get a variable-length NFS file handle by path
354 *
355 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
356 * Function remains to support old versions of nfs-utils.
357 *
358 * Input:
359 * buf: struct nfsctl_fsparm
360 * gd_addr: socket address of client
361 * gd_path: '\0'-terminated C string
362 * containing pathname of
363 * directory in local file system
364 * gd_maxlen: maximum size of returned file
365 * handle
366 * size: size in bytes of passed in nfsctl_fsparm
367 * Output:
368 * On success: passed-in buffer filled with a knfsd_fh structure
369 * (a variable-length raw NFS file handle);
370 * return code is the size in bytes of the file handle
371 * On error: return code is negative errno value
372 *
373 * Note: Only AF_INET client addresses are passed in, since gd_addr
374 * is the same size as a struct sockaddr_in.
375 */
376 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
377 {
378 struct nfsctl_fsparm *data;
379 struct sockaddr_in *sin;
380 struct auth_domain *clp;
381 int err = 0;
382 struct knfsd_fh *res;
383 struct in6_addr in6;
384
385 if (size < sizeof(*data))
386 return -EINVAL;
387 data = (struct nfsctl_fsparm*)buf;
388 err = -EPROTONOSUPPORT;
389 if (data->gd_addr.sa_family != AF_INET)
390 goto out;
391 sin = (struct sockaddr_in *)&data->gd_addr;
392 if (data->gd_maxlen > NFS3_FHSIZE)
393 data->gd_maxlen = NFS3_FHSIZE;
394
395 res = (struct knfsd_fh*)buf;
396
397 exp_readlock();
398
399 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
400
401 clp = auth_unix_lookup(&in6);
402 if (!clp)
403 err = -EPERM;
404 else {
405 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
406 auth_domain_put(clp);
407 }
408 exp_readunlock();
409 if (err == 0)
410 err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
411 out:
412 return err;
413 }
414
415 /**
416 * write_getfd - Get a fixed-length NFS file handle by path (used by mountd)
417 *
418 * Deprecated. /proc/fs/nfsd/filehandle is preferred.
419 * Function remains to support old versions of nfs-utils.
420 *
421 * Input:
422 * buf: struct nfsctl_fdparm
423 * gd_addr: socket address of client
424 * gd_path: '\0'-terminated C string
425 * containing pathname of
426 * directory in local file system
427 * gd_version: fdparm structure version
428 * size: size in bytes of passed in nfsctl_fdparm
429 * Output:
430 * On success: passed-in buffer filled with nfsctl_res
431 * (a fixed-length raw NFS file handle);
432 * return code is the size in bytes of the file handle
433 * On error: return code is negative errno value
434 *
435 * Note: Only AF_INET client addresses are passed in, since gd_addr
436 * is the same size as a struct sockaddr_in.
437 */
438 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
439 {
440 struct nfsctl_fdparm *data;
441 struct sockaddr_in *sin;
442 struct auth_domain *clp;
443 int err = 0;
444 struct knfsd_fh fh;
445 char *res;
446 struct in6_addr in6;
447
448 if (size < sizeof(*data))
449 return -EINVAL;
450 data = (struct nfsctl_fdparm*)buf;
451 err = -EPROTONOSUPPORT;
452 if (data->gd_addr.sa_family != AF_INET)
453 goto out;
454 err = -EINVAL;
455 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
456 goto out;
457
458 res = buf;
459 sin = (struct sockaddr_in *)&data->gd_addr;
460 exp_readlock();
461
462 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
463
464 clp = auth_unix_lookup(&in6);
465 if (!clp)
466 err = -EPERM;
467 else {
468 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
469 auth_domain_put(clp);
470 }
471 exp_readunlock();
472
473 if (err == 0) {
474 memset(res,0, NFS_FHSIZE);
475 memcpy(res, &fh.fh_base, fh.fh_size);
476 err = NFS_FHSIZE;
477 }
478 out:
479 return err;
480 }
481
482 /**
483 * write_unlock_ip - Release all locks used by a client
484 *
485 * Experimental.
486 *
487 * Input:
488 * buf: '\n'-terminated C string containing a
489 * presentation format IP address
490 * size: length of C string in @buf
491 * Output:
492 * On success: returns zero if all specified locks were released;
493 * returns one if one or more locks were not released
494 * On error: return code is negative errno value
495 */
496 static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
497 {
498 struct sockaddr_storage address;
499 struct sockaddr *sap = (struct sockaddr *)&address;
500 size_t salen = sizeof(address);
501 char *fo_path;
502
503 /* sanity check */
504 if (size == 0)
505 return -EINVAL;
506
507 if (buf[size-1] != '\n')
508 return -EINVAL;
509
510 fo_path = buf;
511 if (qword_get(&buf, fo_path, size) < 0)
512 return -EINVAL;
513
514 if (rpc_pton(fo_path, size, sap, salen) == 0)
515 return -EINVAL;
516
517 return nlmsvc_unlock_all_by_ip(sap);
518 }
519
520 /**
521 * write_unlock_fs - Release all locks on a local file system
522 *
523 * Experimental.
524 *
525 * Input:
526 * buf: '\n'-terminated C string containing the
527 * absolute pathname of a local file system
528 * size: length of C string in @buf
529 * Output:
530 * On success: returns zero if all specified locks were released;
531 * returns one if one or more locks were not released
532 * On error: return code is negative errno value
533 */
534 static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
535 {
536 struct path path;
537 char *fo_path;
538 int error;
539
540 /* sanity check */
541 if (size == 0)
542 return -EINVAL;
543
544 if (buf[size-1] != '\n')
545 return -EINVAL;
546
547 fo_path = buf;
548 if (qword_get(&buf, fo_path, size) < 0)
549 return -EINVAL;
550
551 error = kern_path(fo_path, 0, &path);
552 if (error)
553 return error;
554
555 /*
556 * XXX: Needs better sanity checking. Otherwise we could end up
557 * releasing locks on the wrong file system.
558 *
559 * For example:
560 * 1. Does the path refer to a directory?
561 * 2. Is that directory a mount point, or
562 * 3. Is that directory the root of an exported file system?
563 */
564 error = nlmsvc_unlock_all_by_sb(path.mnt->mnt_sb);
565
566 path_put(&path);
567 return error;
568 }
569
570 /**
571 * write_filehandle - Get a variable-length NFS file handle by path
572 *
573 * On input, the buffer contains a '\n'-terminated C string comprised of
574 * three alphanumeric words separated by whitespace. The string may
575 * contain escape sequences.
576 *
577 * Input:
578 * buf:
579 * domain: client domain name
580 * path: export pathname
581 * maxsize: numeric maximum size of
582 * @buf
583 * size: length of C string in @buf
584 * Output:
585 * On success: passed-in buffer filled with '\n'-terminated C
586 * string containing a ASCII hex text version
587 * of the NFS file handle;
588 * return code is the size in bytes of the string
589 * On error: return code is negative errno value
590 */
591 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
592 {
593 char *dname, *path;
594 int uninitialized_var(maxsize);
595 char *mesg = buf;
596 int len;
597 struct auth_domain *dom;
598 struct knfsd_fh fh;
599
600 if (size == 0)
601 return -EINVAL;
602
603 if (buf[size-1] != '\n')
604 return -EINVAL;
605 buf[size-1] = 0;
606
607 dname = mesg;
608 len = qword_get(&mesg, dname, size);
609 if (len <= 0)
610 return -EINVAL;
611
612 path = dname+len+1;
613 len = qword_get(&mesg, path, size);
614 if (len <= 0)
615 return -EINVAL;
616
617 len = get_int(&mesg, &maxsize);
618 if (len)
619 return len;
620
621 if (maxsize < NFS_FHSIZE)
622 return -EINVAL;
623 if (maxsize > NFS3_FHSIZE)
624 maxsize = NFS3_FHSIZE;
625
626 if (qword_get(&mesg, mesg, size)>0)
627 return -EINVAL;
628
629 /* we have all the words, they are in buf.. */
630 dom = unix_domain_find(dname);
631 if (!dom)
632 return -ENOMEM;
633
634 len = exp_rootfh(dom, path, &fh, maxsize);
635 auth_domain_put(dom);
636 if (len)
637 return len;
638
639 mesg = buf;
640 len = SIMPLE_TRANSACTION_LIMIT;
641 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
642 mesg[-1] = '\n';
643 return mesg - buf;
644 }
645
646 /**
647 * write_threads - Start NFSD, or report the current number of running threads
648 *
649 * Input:
650 * buf: ignored
651 * size: zero
652 * Output:
653 * On success: passed-in buffer filled with '\n'-terminated C
654 * string numeric value representing the number of
655 * running NFSD threads;
656 * return code is the size in bytes of the string
657 * On error: return code is zero
658 *
659 * OR
660 *
661 * Input:
662 * buf: C string containing an unsigned
663 * integer value representing the
664 * number of NFSD threads to start
665 * size: non-zero length of C string in @buf
666 * Output:
667 * On success: NFS service is started;
668 * passed-in buffer filled with '\n'-terminated C
669 * string numeric value representing the number of
670 * running NFSD threads;
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 static ssize_t write_threads(struct file *file, char *buf, size_t size)
675 {
676 char *mesg = buf;
677 int rv;
678 if (size > 0) {
679 int newthreads;
680 rv = get_int(&mesg, &newthreads);
681 if (rv)
682 return rv;
683 if (newthreads < 0)
684 return -EINVAL;
685 rv = nfsd_svc(NFS_PORT, newthreads);
686 if (rv < 0)
687 return rv;
688 } else
689 rv = nfsd_nrthreads();
690
691 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
692 }
693
694 /**
695 * write_pool_threads - Set or report the current number of threads per pool
696 *
697 * Input:
698 * buf: ignored
699 * size: zero
700 *
701 * OR
702 *
703 * Input:
704 * buf: C string containing whitespace-
705 * separated unsigned integer values
706 * representing the number of NFSD
707 * threads to start in each pool
708 * size: non-zero length of C string in @buf
709 * Output:
710 * On success: passed-in buffer filled with '\n'-terminated C
711 * string containing integer values representing the
712 * number of NFSD threads in each pool;
713 * return code is the size in bytes of the string
714 * On error: return code is zero or a negative errno value
715 */
716 static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
717 {
718 /* if size > 0, look for an array of number of threads per node
719 * and apply them then write out number of threads per node as reply
720 */
721 char *mesg = buf;
722 int i;
723 int rv;
724 int len;
725 int npools;
726 int *nthreads;
727
728 mutex_lock(&nfsd_mutex);
729 npools = nfsd_nrpools();
730 if (npools == 0) {
731 /*
732 * NFS is shut down. The admin can start it by
733 * writing to the threads file but NOT the pool_threads
734 * file, sorry. Report zero threads.
735 */
736 mutex_unlock(&nfsd_mutex);
737 strcpy(buf, "0\n");
738 return strlen(buf);
739 }
740
741 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
742 rv = -ENOMEM;
743 if (nthreads == NULL)
744 goto out_free;
745
746 if (size > 0) {
747 for (i = 0; i < npools; i++) {
748 rv = get_int(&mesg, &nthreads[i]);
749 if (rv == -ENOENT)
750 break; /* fewer numbers than pools */
751 if (rv)
752 goto out_free; /* syntax error */
753 rv = -EINVAL;
754 if (nthreads[i] < 0)
755 goto out_free;
756 }
757 rv = nfsd_set_nrthreads(i, nthreads);
758 if (rv)
759 goto out_free;
760 }
761
762 rv = nfsd_get_nrthreads(npools, nthreads);
763 if (rv)
764 goto out_free;
765
766 mesg = buf;
767 size = SIMPLE_TRANSACTION_LIMIT;
768 for (i = 0; i < npools && size > 0; i++) {
769 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
770 len = strlen(mesg);
771 size -= len;
772 mesg += len;
773 }
774 rv = mesg - buf;
775 out_free:
776 kfree(nthreads);
777 mutex_unlock(&nfsd_mutex);
778 return rv;
779 }
780
781 static ssize_t __write_versions(struct file *file, char *buf, size_t size)
782 {
783 char *mesg = buf;
784 char *vers, *minorp, sign;
785 int len, num, remaining;
786 unsigned minor;
787 ssize_t tlen = 0;
788 char *sep;
789
790 if (size>0) {
791 if (nfsd_serv)
792 /* Cannot change versions without updating
793 * nfsd_serv->sv_xdrsize, and reallocing
794 * rq_argp and rq_resp
795 */
796 return -EBUSY;
797 if (buf[size-1] != '\n')
798 return -EINVAL;
799 buf[size-1] = 0;
800
801 vers = mesg;
802 len = qword_get(&mesg, vers, size);
803 if (len <= 0) return -EINVAL;
804 do {
805 sign = *vers;
806 if (sign == '+' || sign == '-')
807 num = simple_strtol((vers+1), &minorp, 0);
808 else
809 num = simple_strtol(vers, &minorp, 0);
810 if (*minorp == '.') {
811 if (num < 4)
812 return -EINVAL;
813 minor = simple_strtoul(minorp+1, NULL, 0);
814 if (minor == 0)
815 return -EINVAL;
816 if (nfsd_minorversion(minor, sign == '-' ?
817 NFSD_CLEAR : NFSD_SET) < 0)
818 return -EINVAL;
819 goto next;
820 }
821 switch(num) {
822 case 2:
823 case 3:
824 case 4:
825 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
826 break;
827 default:
828 return -EINVAL;
829 }
830 next:
831 vers += len + 1;
832 } while ((len = qword_get(&mesg, vers, size)) > 0);
833 /* If all get turned off, turn them back on, as
834 * having no versions is BAD
835 */
836 nfsd_reset_versions();
837 }
838
839 /* Now write current state into reply buffer */
840 len = 0;
841 sep = "";
842 remaining = SIMPLE_TRANSACTION_LIMIT;
843 for (num=2 ; num <= 4 ; num++)
844 if (nfsd_vers(num, NFSD_AVAIL)) {
845 len = snprintf(buf, remaining, "%s%c%d", sep,
846 nfsd_vers(num, NFSD_TEST)?'+':'-',
847 num);
848 sep = " ";
849
850 if (len > remaining)
851 break;
852 remaining -= len;
853 buf += len;
854 tlen += len;
855 }
856 if (nfsd_vers(4, NFSD_AVAIL))
857 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
858 minor++) {
859 len = snprintf(buf, remaining, " %c4.%u",
860 (nfsd_vers(4, NFSD_TEST) &&
861 nfsd_minorversion(minor, NFSD_TEST)) ?
862 '+' : '-',
863 minor);
864
865 if (len > remaining)
866 break;
867 remaining -= len;
868 buf += len;
869 tlen += len;
870 }
871
872 len = snprintf(buf, remaining, "\n");
873 if (len > remaining)
874 return -EINVAL;
875 return tlen + len;
876 }
877
878 /**
879 * write_versions - Set or report the available NFS protocol versions
880 *
881 * Input:
882 * buf: ignored
883 * size: zero
884 * Output:
885 * On success: passed-in buffer filled with '\n'-terminated C
886 * string containing positive or negative integer
887 * values representing the current status of each
888 * protocol version;
889 * return code is the size in bytes of the string
890 * On error: return code is zero or a negative errno value
891 *
892 * OR
893 *
894 * Input:
895 * buf: C string containing whitespace-
896 * separated positive or negative
897 * integer values representing NFS
898 * protocol versions to enable ("+n")
899 * or disable ("-n")
900 * size: non-zero length of C string in @buf
901 * Output:
902 * On success: status of zero or more protocol versions has
903 * been updated; passed-in buffer filled with
904 * '\n'-terminated C string containing positive
905 * or negative integer values representing the
906 * current status of each protocol version;
907 * return code is the size in bytes of the string
908 * On error: return code is zero or a negative errno value
909 */
910 static ssize_t write_versions(struct file *file, char *buf, size_t size)
911 {
912 ssize_t rv;
913
914 mutex_lock(&nfsd_mutex);
915 rv = __write_versions(file, buf, size);
916 mutex_unlock(&nfsd_mutex);
917 return rv;
918 }
919
920 /*
921 * Zero-length write. Return a list of NFSD's current listener
922 * transports.
923 */
924 static ssize_t __write_ports_names(char *buf)
925 {
926 if (nfsd_serv == NULL)
927 return 0;
928 return svc_xprt_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
929 }
930
931 /*
932 * A single 'fd' number was written, in which case it must be for
933 * a socket of a supported family/protocol, and we use it as an
934 * nfsd listener.
935 */
936 static ssize_t __write_ports_addfd(char *buf)
937 {
938 char *mesg = buf;
939 int fd, err;
940
941 err = get_int(&mesg, &fd);
942 if (err != 0 || fd < 0)
943 return -EINVAL;
944
945 err = nfsd_create_serv();
946 if (err != 0)
947 return err;
948
949 err = lockd_up();
950 if (err != 0)
951 goto out;
952
953 err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
954 if (err < 0)
955 lockd_down();
956
957 out:
958 /* Decrease the count, but don't shut down the service */
959 nfsd_serv->sv_nrthreads--;
960 return err;
961 }
962
963 /*
964 * A '-' followed by the 'name' of a socket means we close the socket.
965 */
966 static ssize_t __write_ports_delfd(char *buf)
967 {
968 char *toclose;
969 int len = 0;
970
971 toclose = kstrdup(buf + 1, GFP_KERNEL);
972 if (toclose == NULL)
973 return -ENOMEM;
974
975 if (nfsd_serv != NULL)
976 len = svc_sock_names(nfsd_serv, buf,
977 SIMPLE_TRANSACTION_LIMIT, toclose);
978 if (len >= 0)
979 lockd_down();
980
981 kfree(toclose);
982 return len;
983 }
984
985 /*
986 * A transport listener is added by writing it's transport name and
987 * a port number.
988 */
989 static ssize_t __write_ports_addxprt(char *buf)
990 {
991 char transport[16];
992 struct svc_xprt *xprt;
993 int port, err;
994
995 if (sscanf(buf, "%15s %4u", transport, &port) != 2)
996 return -EINVAL;
997
998 if (port < 1 || port > USHORT_MAX)
999 return -EINVAL;
1000
1001 err = nfsd_create_serv();
1002 if (err != 0)
1003 return err;
1004
1005 err = svc_create_xprt(nfsd_serv, transport,
1006 PF_INET, port, SVC_SOCK_ANONYMOUS);
1007 if (err < 0)
1008 goto out_err;
1009
1010 err = svc_create_xprt(nfsd_serv, transport,
1011 PF_INET6, port, SVC_SOCK_ANONYMOUS);
1012 if (err < 0 && err != -EAFNOSUPPORT)
1013 goto out_close;
1014 return 0;
1015 out_close:
1016 xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port);
1017 if (xprt != NULL) {
1018 svc_close_xprt(xprt);
1019 svc_xprt_put(xprt);
1020 }
1021 out_err:
1022 /* Decrease the count, but don't shut down the service */
1023 nfsd_serv->sv_nrthreads--;
1024 return err;
1025 }
1026
1027 /*
1028 * A transport listener is removed by writing a "-", it's transport
1029 * name, and it's port number.
1030 */
1031 static ssize_t __write_ports_delxprt(char *buf)
1032 {
1033 struct svc_xprt *xprt;
1034 char transport[16];
1035 int port;
1036
1037 if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2)
1038 return -EINVAL;
1039
1040 if (port < 1 || port > USHORT_MAX || nfsd_serv == NULL)
1041 return -EINVAL;
1042
1043 xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port);
1044 if (xprt == NULL)
1045 return -ENOTCONN;
1046
1047 svc_close_xprt(xprt);
1048 svc_xprt_put(xprt);
1049 return 0;
1050 }
1051
1052 static ssize_t __write_ports(struct file *file, char *buf, size_t size)
1053 {
1054 if (size == 0)
1055 return __write_ports_names(buf);
1056
1057 if (isdigit(buf[0]))
1058 return __write_ports_addfd(buf);
1059
1060 if (buf[0] == '-' && isdigit(buf[1]))
1061 return __write_ports_delfd(buf);
1062
1063 if (isalpha(buf[0]))
1064 return __write_ports_addxprt(buf);
1065
1066 if (buf[0] == '-' && isalpha(buf[1]))
1067 return __write_ports_delxprt(buf);
1068
1069 return -EINVAL;
1070 }
1071
1072 /**
1073 * write_ports - Pass a socket file descriptor or transport name to listen on
1074 *
1075 * Input:
1076 * buf: ignored
1077 * size: zero
1078 * Output:
1079 * On success: passed-in buffer filled with a '\n'-terminated C
1080 * string containing a whitespace-separated list of
1081 * named NFSD listeners;
1082 * return code is the size in bytes of the string
1083 * On error: return code is zero or a negative errno value
1084 *
1085 * OR
1086 *
1087 * Input:
1088 * buf: C string containing an unsigned
1089 * integer value representing a bound
1090 * but unconnected socket that is to be
1091 * used as an NFSD listener; listen(3)
1092 * must be called for a SOCK_STREAM
1093 * socket, otherwise it is ignored
1094 * size: non-zero length of C string in @buf
1095 * Output:
1096 * On success: NFS service is started;
1097 * passed-in buffer filled with a '\n'-terminated C
1098 * string containing a unique alphanumeric name of
1099 * the listener;
1100 * return code is the size in bytes of the string
1101 * On error: return code is a negative errno value
1102 *
1103 * OR
1104 *
1105 * Input:
1106 * buf: C string containing a "-" followed
1107 * by an integer value representing a
1108 * previously passed in socket file
1109 * descriptor
1110 * size: non-zero length of C string in @buf
1111 * Output:
1112 * On success: NFS service no longer listens on that socket;
1113 * passed-in buffer filled with a '\n'-terminated C
1114 * string containing a unique name of the listener;
1115 * return code is the size in bytes of the string
1116 * On error: return code is a negative errno value
1117 *
1118 * OR
1119 *
1120 * Input:
1121 * buf: C string containing a transport
1122 * name and an unsigned integer value
1123 * representing the port to listen on,
1124 * separated by whitespace
1125 * size: non-zero length of C string in @buf
1126 * Output:
1127 * On success: returns zero; NFS service is started
1128 * On error: return code is a negative errno value
1129 *
1130 * OR
1131 *
1132 * Input:
1133 * buf: C string containing a "-" followed
1134 * by a transport name and an unsigned
1135 * integer value representing the port
1136 * to listen on, separated by whitespace
1137 * size: non-zero length of C string in @buf
1138 * Output:
1139 * On success: returns zero; NFS service no longer listens
1140 * on that transport
1141 * On error: return code is a negative errno value
1142 */
1143 static ssize_t write_ports(struct file *file, char *buf, size_t size)
1144 {
1145 ssize_t rv;
1146
1147 mutex_lock(&nfsd_mutex);
1148 rv = __write_ports(file, buf, size);
1149 mutex_unlock(&nfsd_mutex);
1150 return rv;
1151 }
1152
1153
1154 int nfsd_max_blksize;
1155
1156 /**
1157 * write_maxblksize - Set or report the current NFS blksize
1158 *
1159 * Input:
1160 * buf: ignored
1161 * size: zero
1162 *
1163 * OR
1164 *
1165 * Input:
1166 * buf: C string containing an unsigned
1167 * integer value representing the new
1168 * NFS blksize
1169 * size: non-zero length of C string in @buf
1170 * Output:
1171 * On success: passed-in buffer filled with '\n'-terminated C string
1172 * containing numeric value of the current NFS blksize
1173 * setting;
1174 * return code is the size in bytes of the string
1175 * On error: return code is zero or a negative errno value
1176 */
1177 static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
1178 {
1179 char *mesg = buf;
1180 if (size > 0) {
1181 int bsize;
1182 int rv = get_int(&mesg, &bsize);
1183 if (rv)
1184 return rv;
1185 /* force bsize into allowed range and
1186 * required alignment.
1187 */
1188 if (bsize < 1024)
1189 bsize = 1024;
1190 if (bsize > NFSSVC_MAXBLKSIZE)
1191 bsize = NFSSVC_MAXBLKSIZE;
1192 bsize &= ~(1024-1);
1193 mutex_lock(&nfsd_mutex);
1194 if (nfsd_serv && nfsd_serv->sv_nrthreads) {
1195 mutex_unlock(&nfsd_mutex);
1196 return -EBUSY;
1197 }
1198 nfsd_max_blksize = bsize;
1199 mutex_unlock(&nfsd_mutex);
1200 }
1201
1202 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
1203 nfsd_max_blksize);
1204 }
1205
1206 #ifdef CONFIG_NFSD_V4
1207 extern time_t nfs4_leasetime(void);
1208
1209 static ssize_t __write_leasetime(struct file *file, char *buf, size_t size)
1210 {
1211 /* if size > 10 seconds, call
1212 * nfs4_reset_lease() then write out the new lease (seconds) as reply
1213 */
1214 char *mesg = buf;
1215 int rv, lease;
1216
1217 if (size > 0) {
1218 if (nfsd_serv)
1219 return -EBUSY;
1220 rv = get_int(&mesg, &lease);
1221 if (rv)
1222 return rv;
1223 if (lease < 10 || lease > 3600)
1224 return -EINVAL;
1225 nfs4_reset_lease(lease);
1226 }
1227
1228 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n",
1229 nfs4_lease_time());
1230 }
1231
1232 /**
1233 * write_leasetime - Set or report the current NFSv4 lease time
1234 *
1235 * Input:
1236 * buf: ignored
1237 * size: zero
1238 *
1239 * OR
1240 *
1241 * Input:
1242 * buf: C string containing an unsigned
1243 * integer value representing the new
1244 * NFSv4 lease expiry time
1245 * size: non-zero length of C string in @buf
1246 * Output:
1247 * On success: passed-in buffer filled with '\n'-terminated C
1248 * string containing unsigned integer value of the
1249 * current lease expiry time;
1250 * return code is the size in bytes of the string
1251 * On error: return code is zero or a negative errno value
1252 */
1253 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1254 {
1255 ssize_t rv;
1256
1257 mutex_lock(&nfsd_mutex);
1258 rv = __write_leasetime(file, buf, size);
1259 mutex_unlock(&nfsd_mutex);
1260 return rv;
1261 }
1262
1263 extern char *nfs4_recoverydir(void);
1264
1265 static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size)
1266 {
1267 char *mesg = buf;
1268 char *recdir;
1269 int len, status;
1270
1271 if (size > 0) {
1272 if (nfsd_serv)
1273 return -EBUSY;
1274 if (size > PATH_MAX || buf[size-1] != '\n')
1275 return -EINVAL;
1276 buf[size-1] = 0;
1277
1278 recdir = mesg;
1279 len = qword_get(&mesg, recdir, size);
1280 if (len <= 0)
1281 return -EINVAL;
1282
1283 status = nfs4_reset_recoverydir(recdir);
1284 }
1285
1286 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1287 nfs4_recoverydir());
1288 }
1289
1290 /**
1291 * write_recoverydir - Set or report the pathname of the recovery directory
1292 *
1293 * Input:
1294 * buf: ignored
1295 * size: zero
1296 *
1297 * OR
1298 *
1299 * Input:
1300 * buf: C string containing the pathname
1301 * of the directory on a local file
1302 * system containing permanent NFSv4
1303 * recovery data
1304 * size: non-zero length of C string in @buf
1305 * Output:
1306 * On success: passed-in buffer filled with '\n'-terminated C string
1307 * containing the current recovery pathname setting;
1308 * return code is the size in bytes of the string
1309 * On error: return code is zero or a negative errno value
1310 */
1311 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1312 {
1313 ssize_t rv;
1314
1315 mutex_lock(&nfsd_mutex);
1316 rv = __write_recoverydir(file, buf, size);
1317 mutex_unlock(&nfsd_mutex);
1318 return rv;
1319 }
1320
1321 #endif
1322
1323 /*----------------------------------------------------------------------------*/
1324 /*
1325 * populating the filesystem.
1326 */
1327
1328 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1329 {
1330 static struct tree_descr nfsd_files[] = {
1331 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
1332 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
1333 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
1334 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
1335 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
1336 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
1337 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
1338 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
1339 [NFSD_Export_features] = {"export_features",
1340 &export_features_operations, S_IRUGO},
1341 [NFSD_FO_UnlockIP] = {"unlock_ip",
1342 &transaction_ops, S_IWUSR|S_IRUSR},
1343 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1344 &transaction_ops, S_IWUSR|S_IRUSR},
1345 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1346 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1347 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1348 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1349 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1350 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1351 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1352 #ifdef CONFIG_NFSD_V4
1353 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1354 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1355 #endif
1356 /* last one */ {""}
1357 };
1358 return simple_fill_super(sb, 0x6e667364, nfsd_files);
1359 }
1360
1361 static int nfsd_get_sb(struct file_system_type *fs_type,
1362 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1363 {
1364 return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1365 }
1366
1367 static struct file_system_type nfsd_fs_type = {
1368 .owner = THIS_MODULE,
1369 .name = "nfsd",
1370 .get_sb = nfsd_get_sb,
1371 .kill_sb = kill_litter_super,
1372 };
1373
1374 #ifdef CONFIG_PROC_FS
1375 static int create_proc_exports_entry(void)
1376 {
1377 struct proc_dir_entry *entry;
1378
1379 entry = proc_mkdir("fs/nfs", NULL);
1380 if (!entry)
1381 return -ENOMEM;
1382 entry = proc_create("exports", 0, entry, &exports_operations);
1383 if (!entry)
1384 return -ENOMEM;
1385 return 0;
1386 }
1387 #else /* CONFIG_PROC_FS */
1388 static int create_proc_exports_entry(void)
1389 {
1390 return 0;
1391 }
1392 #endif
1393
1394 static int __init init_nfsd(void)
1395 {
1396 int retval;
1397 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1398
1399 retval = nfs4_state_init(); /* nfs4 locking state */
1400 if (retval)
1401 return retval;
1402 nfsd_stat_init(); /* Statistics */
1403 retval = nfsd_reply_cache_init();
1404 if (retval)
1405 goto out_free_stat;
1406 retval = nfsd_export_init();
1407 if (retval)
1408 goto out_free_cache;
1409 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1410 retval = nfsd_idmap_init();
1411 if (retval)
1412 goto out_free_lockd;
1413 retval = create_proc_exports_entry();
1414 if (retval)
1415 goto out_free_idmap;
1416 retval = register_filesystem(&nfsd_fs_type);
1417 if (retval)
1418 goto out_free_all;
1419 return 0;
1420 out_free_all:
1421 remove_proc_entry("fs/nfs/exports", NULL);
1422 remove_proc_entry("fs/nfs", NULL);
1423 out_free_idmap:
1424 nfsd_idmap_shutdown();
1425 out_free_lockd:
1426 nfsd_lockd_shutdown();
1427 nfsd_export_shutdown();
1428 out_free_cache:
1429 nfsd_reply_cache_shutdown();
1430 out_free_stat:
1431 nfsd_stat_shutdown();
1432 nfsd4_free_slabs();
1433 return retval;
1434 }
1435
1436 static void __exit exit_nfsd(void)
1437 {
1438 nfsd_export_shutdown();
1439 nfsd_reply_cache_shutdown();
1440 remove_proc_entry("fs/nfs/exports", NULL);
1441 remove_proc_entry("fs/nfs", NULL);
1442 nfsd_stat_shutdown();
1443 nfsd_lockd_shutdown();
1444 nfsd_idmap_shutdown();
1445 nfsd4_free_slabs();
1446 unregister_filesystem(&nfsd_fs_type);
1447 }
1448
1449 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1450 MODULE_LICENSE("GPL");
1451 module_init(init_nfsd)
1452 module_exit(exit_nfsd)
kernel source for telekom puls (alcatel/mediatek)