blob: 28dfad39f0c50a626384c4363955e2b9d7e3212f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Central processing for nfsd.
3 *
4 * Authors: Olaf Kirch (okir@monad.swb.de)
5 *
6 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
7 */
8
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +04009#include <linux/sched.h>
Rafael J. Wysocki83144182007-07-17 04:03:35 -070010#include <linux/freezer.h>
Paul Gortmaker143cb492011-07-01 14:23:34 -040011#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/fs_struct.h>
Andy Adamsonc3d06f92009-04-03 08:28:18 +030013#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/stats.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/sunrpc/svcsock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/lockd/bind.h>
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000018#include <linux/nfsacl.h>
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +090019#include <linux/seq_file.h>
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +040020#include <net/net_namespace.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020021#include "nfsd.h"
22#include "cache.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050023#include "vfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#define NFSDDBG_FACILITY NFSDDBG_SVC
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027extern struct svc_program nfsd_program;
Jeff Layton9867d762008-06-10 08:40:38 -040028static int nfsd(void *vrqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029struct timeval nfssvc_boot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Neil Brownbedbdd82008-06-10 08:40:35 -040031/*
32 * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
33 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
34 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
35 *
36 * If (out side the lock) nfsd_serv is non-NULL, then it must point to a
37 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
38 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
39 * entry of ->sv_pools[].
40 *
41 * Transitions of the thread count between zero and non-zero are of particular
42 * interest since the svc_serv needs to be created and initialized at that
43 * point, or freed.
Jeff Layton3dd98a32008-06-10 08:40:36 -040044 *
45 * Finally, the nfsd_mutex also protects some of the global variables that are
46 * accessed when nfsd starts and that are settable via the write_* routines in
47 * nfsctl.c. In particular:
48 *
49 * user_recovery_dirname
50 * user_lease_time
51 * nfsd_versions
Neil Brownbedbdd82008-06-10 08:40:35 -040052 */
53DEFINE_MUTEX(nfsd_mutex);
54struct svc_serv *nfsd_serv;
55
Andy Adamson4bd9b0f2009-06-24 15:37:45 -040056/*
57 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
58 * nfsd_drc_max_pages limits the total amount of memory available for
59 * version 4.1 DRC caches.
60 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
61 */
62spinlock_t nfsd_drc_lock;
Andy Adamson0c193052009-07-27 19:09:19 -040063unsigned int nfsd_drc_max_mem;
64unsigned int nfsd_drc_mem_used;
Andy Adamson4bd9b0f2009-06-24 15:37:45 -040065
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080066#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
67static struct svc_stat nfsd_acl_svcstats;
68static struct svc_version * nfsd_acl_version[] = {
69 [2] = &nfsd_acl_version2,
70 [3] = &nfsd_acl_version3,
71};
72
73#define NFSD_ACL_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -080074#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080075static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
76
77static struct svc_program nfsd_acl_program = {
78 .pg_prog = NFS_ACL_PROGRAM,
79 .pg_nvers = NFSD_ACL_NRVERS,
80 .pg_vers = nfsd_acl_versions,
NeilBrown1a8eff62007-01-26 00:56:58 -080081 .pg_name = "nfsacl",
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080082 .pg_class = "nfsd",
83 .pg_stats = &nfsd_acl_svcstats,
84 .pg_authenticate = &svc_set_client,
85};
86
87static struct svc_stat nfsd_acl_svcstats = {
88 .program = &nfsd_acl_program,
89};
90#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
91
NeilBrown70c3b762005-11-07 01:00:25 -080092static struct svc_version * nfsd_version[] = {
93 [2] = &nfsd_version2,
94#if defined(CONFIG_NFSD_V3)
95 [3] = &nfsd_version3,
96#endif
97#if defined(CONFIG_NFSD_V4)
98 [4] = &nfsd_version4,
99#endif
100};
101
102#define NFSD_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -0800103#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
NeilBrown70c3b762005-11-07 01:00:25 -0800104static struct svc_version *nfsd_versions[NFSD_NRVERS];
105
106struct svc_program nfsd_program = {
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800107#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
108 .pg_next = &nfsd_acl_program,
109#endif
NeilBrown70c3b762005-11-07 01:00:25 -0800110 .pg_prog = NFS_PROGRAM, /* program number */
111 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
112 .pg_vers = nfsd_versions, /* version table */
113 .pg_name = "nfsd", /* program name */
114 .pg_class = "nfsd", /* authentication class */
115 .pg_stats = &nfsd_svcstats, /* version table */
116 .pg_authenticate = &svc_set_client, /* export authentication */
117
118};
119
Benny Halevy8daf2202009-04-03 08:28:59 +0300120u32 nfsd_supported_minorversion;
121
NeilBrown6658d3a2006-10-02 02:17:46 -0700122int nfsd_vers(int vers, enum vers_op change)
123{
124 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
Pavel Emelyanov15ddb4a2010-05-14 15:33:36 +0400125 return 0;
NeilBrown6658d3a2006-10-02 02:17:46 -0700126 switch(change) {
127 case NFSD_SET:
128 nfsd_versions[vers] = nfsd_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700129#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
130 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800131 nfsd_acl_versions[vers] = nfsd_acl_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700132#endif
NeilBrown1a8eff62007-01-26 00:56:58 -0800133 break;
NeilBrown6658d3a2006-10-02 02:17:46 -0700134 case NFSD_CLEAR:
135 nfsd_versions[vers] = NULL;
136#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
137 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800138 nfsd_acl_versions[vers] = NULL;
NeilBrown6658d3a2006-10-02 02:17:46 -0700139#endif
140 break;
141 case NFSD_TEST:
142 return nfsd_versions[vers] != NULL;
143 case NFSD_AVAIL:
144 return nfsd_version[vers] != NULL;
145 }
146 return 0;
147}
Benny Halevy8daf2202009-04-03 08:28:59 +0300148
149int nfsd_minorversion(u32 minorversion, enum vers_op change)
150{
151 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
152 return -1;
153 switch(change) {
154 case NFSD_SET:
155 nfsd_supported_minorversion = minorversion;
156 break;
157 case NFSD_CLEAR:
158 if (minorversion == 0)
159 return -1;
160 nfsd_supported_minorversion = minorversion - 1;
161 break;
162 case NFSD_TEST:
163 return minorversion <= nfsd_supported_minorversion;
164 case NFSD_AVAIL:
165 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
166 }
167 return 0;
168}
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170/*
171 * Maximum number of nfsd processes
172 */
173#define NFSD_MAXSERVS 8192
174
175int nfsd_nrthreads(void)
176{
Neil Brownc7d106c2008-06-12 13:38:42 +1000177 int rv = 0;
178 mutex_lock(&nfsd_mutex);
179 if (nfsd_serv)
180 rv = nfsd_serv->sv_nrthreads;
181 mutex_unlock(&nfsd_mutex);
182 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400185static int nfsd_init_socks(int port)
186{
187 int error;
188 if (!list_empty(&nfsd_serv->sv_permsocks))
189 return 0;
190
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +0400191 error = svc_create_xprt(nfsd_serv, "udp", &init_net, PF_INET, port,
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400192 SVC_SOCK_DEFAULTS);
193 if (error < 0)
194 return error;
195
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +0400196 error = svc_create_xprt(nfsd_serv, "tcp", &init_net, PF_INET, port,
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400197 SVC_SOCK_DEFAULTS);
198 if (error < 0)
199 return error;
200
201 return 0;
202}
203
Jeff Layton4ad9a342010-07-19 16:50:04 -0400204static bool nfsd_up = false;
205
206static int nfsd_startup(unsigned short port, int nrservs)
207{
208 int ret;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400209
210 if (nfsd_up)
211 return 0;
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400212 /*
213 * Readahead param cache - will no-op if it already exists.
214 * (Note therefore results will be suboptimal if number of
215 * threads is modified after nfsd start.)
216 */
217 ret = nfsd_racache_init(2*nrservs);
218 if (ret)
219 return ret;
220 ret = nfsd_init_socks(port);
221 if (ret)
222 goto out_racache;
Jeff Laytonac77efb2010-07-20 14:10:22 -0400223 ret = lockd_up();
224 if (ret)
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400225 goto out_racache;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400226 ret = nfs4_state_start();
Jeff Laytonac77efb2010-07-20 14:10:22 -0400227 if (ret)
228 goto out_lockd;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400229 nfsd_up = true;
Jeff Laytonac77efb2010-07-20 14:10:22 -0400230 return 0;
231out_lockd:
232 lockd_down();
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400233out_racache:
234 nfsd_racache_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400235 return ret;
236}
237
238static void nfsd_shutdown(void)
239{
240 /*
241 * write_ports can create the server without actually starting
242 * any threads--if we get shut down before any threads are
243 * started, then nfsd_last_thread will be run before any of this
244 * other initialization has been done.
245 */
246 if (!nfsd_up)
247 return;
248 nfs4_state_shutdown();
J. Bruce Fields59db4a02010-07-21 18:29:25 -0400249 lockd_down();
250 nfsd_racache_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400251 nfsd_up = false;
252}
253
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400254static void nfsd_last_thread(struct svc_serv *serv, struct net *net)
NeilBrownbc591cc2006-10-02 02:17:44 -0700255{
256 /* When last nfsd thread exits we need to do some clean-up */
257 nfsd_serv = NULL;
Jeff Layton4ad9a342010-07-19 16:50:04 -0400258 nfsd_shutdown();
NeilBrownbc591cc2006-10-02 02:17:44 -0700259
Stanislav Kinsbursky5ecebb72012-01-13 14:03:04 +0400260 svc_rpcb_cleanup(serv, net);
Stanislav Kinsbursky16d05872011-10-25 14:17:28 +0300261
Jeff Laytone096bbc2008-06-10 08:40:37 -0400262 printk(KERN_WARNING "nfsd: last server has exited, flushing export "
263 "cache\n");
264 nfsd_export_flush();
NeilBrownbc591cc2006-10-02 02:17:44 -0700265}
NeilBrown6658d3a2006-10-02 02:17:46 -0700266
267void nfsd_reset_versions(void)
268{
269 int found_one = 0;
270 int i;
271
272 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
273 if (nfsd_program.pg_vers[i])
274 found_one = 1;
275 }
276
277 if (!found_one) {
278 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
279 nfsd_program.pg_vers[i] = nfsd_version[i];
280#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
281 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
282 nfsd_acl_program.pg_vers[i] =
283 nfsd_acl_version[i];
284#endif
285 }
286}
287
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300288/*
289 * Each session guarantees a negotiated per slot memory cache for replies
290 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
291 * NFSv4.1 server might want to use more memory for a DRC than a machine
292 * with mutiple services.
293 *
294 * Impose a hard limit on the number of pages for the DRC which varies
295 * according to the machines free pages. This is of course only a default.
296 *
297 * For now this is a #defined shift which could be under admin control
298 * in the future.
299 */
300static void set_max_drc(void)
301{
Andy Adamson6a14dd12009-07-27 19:06:45 -0400302 #define NFSD_DRC_SIZE_SHIFT 10
Andy Adamson0c193052009-07-27 19:09:19 -0400303 nfsd_drc_max_mem = (nr_free_buffer_pages()
304 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
305 nfsd_drc_mem_used = 0;
Andy Adamson4bd9b0f2009-06-24 15:37:45 -0400306 spin_lock_init(&nfsd_drc_lock);
Andy Adamson0c193052009-07-27 19:09:19 -0400307 dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300308}
Neil Brownbedbdd82008-06-10 08:40:35 -0400309
J. Bruce Fields87b0fc72012-01-30 16:18:35 -0500310static int nfsd_get_default_max_blksize(void)
311{
312 struct sysinfo i;
313 unsigned long long target;
314 unsigned long ret;
315
316 si_meminfo(&i);
J. Bruce Fields508f9222012-01-30 16:21:11 -0500317 target = (i.totalram - i.totalhigh) << PAGE_SHIFT;
J. Bruce Fields87b0fc72012-01-30 16:18:35 -0500318 /*
319 * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig
320 * machines, but only uses 32K on 128M machines. Bottom out at
321 * 8K on 32M and smaller. Of course, this is only a default.
322 */
323 target >>= 12;
324
325 ret = NFSSVC_MAXBLKSIZE;
326 while (ret > target && ret >= 8*1024*2)
327 ret /= 2;
328 return ret;
329}
330
NeilBrownb41b66d2006-10-02 02:17:48 -0700331int nfsd_create_serv(void)
NeilBrown02a375f2006-10-02 02:17:46 -0700332{
Neil Brownbedbdd82008-06-10 08:40:35 -0400333 WARN_ON(!mutex_is_locked(&nfsd_mutex));
NeilBrown02a375f2006-10-02 02:17:46 -0700334 if (nfsd_serv) {
Greg Banks9a24ab52006-10-02 02:17:58 -0700335 svc_get(nfsd_serv);
NeilBrown02a375f2006-10-02 02:17:46 -0700336 return 0;
337 }
J. Bruce Fields87b0fc72012-01-30 16:18:35 -0500338 if (nfsd_max_blksize == 0)
339 nfsd_max_blksize = nfsd_get_default_max_blksize();
J. Bruce Fieldse844a7b2010-08-06 15:48:03 -0400340 nfsd_reset_versions();
Jeff Laytone096bbc2008-06-10 08:40:37 -0400341 nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
Jeff Laytona75c5d02008-06-10 08:40:39 -0400342 nfsd_last_thread, nfsd, THIS_MODULE);
NeilBrown02a375f2006-10-02 02:17:46 -0700343 if (nfsd_serv == NULL)
Jeff Layton628b3682010-07-21 16:40:08 -0400344 return -ENOMEM;
Neil Brownbedbdd82008-06-10 08:40:35 -0400345
Jeff Layton628b3682010-07-21 16:40:08 -0400346 set_max_drc();
NeilBrown02a375f2006-10-02 02:17:46 -0700347 do_gettimeofday(&nfssvc_boot); /* record boot time */
J. Bruce Fields87b0fc72012-01-30 16:18:35 -0500348 return 0;
NeilBrown02a375f2006-10-02 02:17:46 -0700349}
350
Greg Bankseed29652006-10-02 02:18:02 -0700351int nfsd_nrpools(void)
352{
353 if (nfsd_serv == NULL)
354 return 0;
355 else
356 return nfsd_serv->sv_nrpools;
357}
358
359int nfsd_get_nrthreads(int n, int *nthreads)
360{
361 int i = 0;
362
363 if (nfsd_serv != NULL) {
364 for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++)
365 nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads;
366 }
367
368 return 0;
369}
370
371int nfsd_set_nrthreads(int n, int *nthreads)
372{
373 int i = 0;
374 int tot = 0;
375 int err = 0;
376
Neil Brownbedbdd82008-06-10 08:40:35 -0400377 WARN_ON(!mutex_is_locked(&nfsd_mutex));
378
Greg Bankseed29652006-10-02 02:18:02 -0700379 if (nfsd_serv == NULL || n <= 0)
380 return 0;
381
382 if (n > nfsd_serv->sv_nrpools)
383 n = nfsd_serv->sv_nrpools;
384
385 /* enforce a global maximum number of threads */
386 tot = 0;
387 for (i = 0; i < n; i++) {
388 if (nthreads[i] > NFSD_MAXSERVS)
389 nthreads[i] = NFSD_MAXSERVS;
390 tot += nthreads[i];
391 }
392 if (tot > NFSD_MAXSERVS) {
393 /* total too large: scale down requested numbers */
394 for (i = 0; i < n && tot > 0; i++) {
395 int new = nthreads[i] * NFSD_MAXSERVS / tot;
396 tot -= (nthreads[i] - new);
397 nthreads[i] = new;
398 }
399 for (i = 0; i < n && tot > 0; i++) {
400 nthreads[i]--;
401 tot--;
402 }
403 }
404
405 /*
406 * There must always be a thread in pool 0; the admin
407 * can't shut down NFS completely using pool_threads.
408 */
409 if (nthreads[0] == 0)
410 nthreads[0] = 1;
411
412 /* apply the new numbers */
Greg Bankseed29652006-10-02 02:18:02 -0700413 svc_get(nfsd_serv);
414 for (i = 0; i < n; i++) {
415 err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i],
416 nthreads[i]);
417 if (err)
418 break;
419 }
420 svc_destroy(nfsd_serv);
Greg Bankseed29652006-10-02 02:18:02 -0700421
422 return err;
423}
424
Jeff Laytonac77efb2010-07-20 14:10:22 -0400425/*
426 * Adjust the number of threads and return the new number of threads.
427 * This is also the function that starts the server if necessary, if
428 * this is the first time nrservs is nonzero.
429 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430int
431nfsd_svc(unsigned short port, int nrservs)
432{
433 int error;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400434 bool nfsd_up_before;
Neil Brownbedbdd82008-06-10 08:40:35 -0400435
436 mutex_lock(&nfsd_mutex);
NeilBrown6658d3a2006-10-02 02:17:46 -0700437 dprintk("nfsd: creating service\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 if (nrservs <= 0)
439 nrservs = 0;
440 if (nrservs > NFSD_MAXSERVS)
441 nrservs = NFSD_MAXSERVS;
NeilBrown671e1fc2009-06-16 11:03:20 +1000442 error = 0;
443 if (nrservs == 0 && nfsd_serv == NULL)
444 goto out;
445
NeilBrown02a375f2006-10-02 02:17:46 -0700446 error = nfsd_create_serv();
NeilBrown02a375f2006-10-02 02:17:46 -0700447 if (error)
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400448 goto out;
449
450 nfsd_up_before = nfsd_up;
451
452 error = nfsd_startup(port, nrservs);
J. Bruce Fieldsaf4718f2010-07-21 18:31:42 -0400453 if (error)
454 goto out_destroy;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400455 error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
456 if (error)
457 goto out_shutdown;
J. Bruce Fieldsaf4718f2010-07-21 18:31:42 -0400458 /* We are holding a reference to nfsd_serv which
459 * we don't want to count in the return value,
460 * so subtract 1
461 */
462 error = nfsd_serv->sv_nrthreads - 1;
J. Bruce Fields774f8bb2010-08-02 14:12:44 -0400463out_shutdown:
464 if (error < 0 && !nfsd_up_before)
465 nfsd_shutdown();
Jeff Layton4ad9a342010-07-19 16:50:04 -0400466out_destroy:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 svc_destroy(nfsd_serv); /* Release server */
Jeff Layton4ad9a342010-07-19 16:50:04 -0400468out:
Neil Brownbedbdd82008-06-10 08:40:35 -0400469 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 return error;
471}
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474/*
475 * This is the NFS server kernel thread
476 */
Jeff Layton9867d762008-06-10 08:40:38 -0400477static int
478nfsd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
Jeff Layton9867d762008-06-10 08:40:38 -0400480 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
Jeff Layton9867d762008-06-10 08:40:38 -0400481 int err, preverr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 /* Lock module and set up kernel thread */
Neil Brownbedbdd82008-06-10 08:40:35 -0400484 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Jeff Layton9867d762008-06-10 08:40:38 -0400486 /* At this point, the thread shares current->fs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 * with the init process. We need to create files with a
488 * umask of 0 instead of init's umask. */
Al Viro3e93cd62009-03-29 19:00:13 -0400489 if (unshare_fs_struct() < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 printk("Unable to start nfsd thread: out of memory\n");
491 goto out;
492 }
Al Viro3e93cd62009-03-29 19:00:13 -0400493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 current->fs->umask = 0;
495
Jeff Layton9867d762008-06-10 08:40:38 -0400496 /*
497 * thread is spawned with all signals set to SIG_IGN, re-enable
Jeff Layton100766f2008-06-30 14:09:46 -0400498 * the ones that will bring down the thread
Jeff Layton9867d762008-06-10 08:40:38 -0400499 */
Jeff Layton100766f2008-06-30 14:09:46 -0400500 allow_signal(SIGKILL);
501 allow_signal(SIGHUP);
502 allow_signal(SIGINT);
503 allow_signal(SIGQUIT);
Neil Brownbedbdd82008-06-10 08:40:35 -0400504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 nfsdstats.th_cnt++;
Neil Brownbedbdd82008-06-10 08:40:35 -0400506 mutex_unlock(&nfsd_mutex);
507
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 /*
509 * We want less throttling in balance_dirty_pages() so that nfs to
510 * localhost doesn't cause nfsd to lock up due to all the client's
511 * dirty pages.
512 */
513 current->flags |= PF_LESS_THROTTLE;
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700514 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516 /*
517 * The main request loop
518 */
519 for (;;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 /*
521 * Find a socket with data available and call its
522 * recvfrom routine.
523 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700524 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 ;
Jeff Layton9867d762008-06-10 08:40:38 -0400526 if (err == -EINTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 break;
Jeff Layton9867d762008-06-10 08:40:38 -0400528 else if (err < 0) {
529 if (err != preverr) {
530 printk(KERN_WARNING "%s: unexpected error "
531 "from svc_recv (%d)\n", __func__, -err);
532 preverr = err;
533 }
534 schedule_timeout_uninterruptible(HZ);
535 continue;
536 }
537
David Howellse0e81732009-09-02 09:13:40 +0100538 validate_process_creds();
NeilBrown6fb2b472006-10-02 02:17:50 -0700539 svc_process(rqstp);
David Howellse0e81732009-09-02 09:13:40 +0100540 validate_process_creds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 }
542
NeilBrown24e36662006-10-02 02:17:45 -0700543 /* Clear signals before calling svc_exit_thread() */
NeilBrown9e416052005-04-16 15:26:37 -0700544 flush_signals(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Neil Brownbedbdd82008-06-10 08:40:35 -0400546 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 nfsdstats.th_cnt --;
548
549out:
550 /* Release the thread */
551 svc_exit_thread(rqstp);
552
553 /* Release module */
Neil Brownbedbdd82008-06-10 08:40:35 -0400554 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 module_put_and_exit(0);
Jeff Layton9867d762008-06-10 08:40:38 -0400556 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
Andy Adamson32c1eb02007-07-17 04:04:48 -0700559static __be32 map_new_errors(u32 vers, __be32 nfserr)
560{
561 if (nfserr == nfserr_jukebox && vers == 2)
562 return nfserr_dropit;
563 if (nfserr == nfserr_wrongsec && vers < 4)
564 return nfserr_acces;
565 return nfserr;
566}
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568int
Al Viroc7afef12006-10-19 23:29:02 -0700569nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
571 struct svc_procedure *proc;
572 kxdrproc_t xdr;
Al Viroad451d32006-10-19 23:28:55 -0700573 __be32 nfserr;
574 __be32 *nfserrp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
576 dprintk("nfsd_dispatch: vers %d proc %d\n",
577 rqstp->rq_vers, rqstp->rq_proc);
578 proc = rqstp->rq_procinfo;
579
J. Bruce Fields10910062011-01-24 12:11:02 -0500580 /*
581 * Give the xdr decoder a chance to change this if it wants
582 * (necessary in the NFSv4.0 compound case)
583 */
584 rqstp->rq_cachetype = proc->pc_cachetype;
585 /* Decode arguments */
586 xdr = proc->pc_decode;
587 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base,
588 rqstp->rq_argp)) {
589 dprintk("nfsd: failed to decode arguments!\n");
590 *statp = rpc_garbage_args;
591 return 1;
592 }
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 /* Check whether we have this call in the cache. */
J. Bruce Fields10910062011-01-24 12:11:02 -0500595 switch (nfsd_cache_lookup(rqstp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 case RC_INTR:
597 case RC_DROPIT:
598 return 0;
599 case RC_REPLY:
600 return 1;
601 case RC_DOIT:;
602 /* do it */
603 }
604
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 /* need to grab the location to store the status, as
606 * nfsv4 does some encoding while processing
607 */
608 nfserrp = rqstp->rq_res.head[0].iov_base
609 + rqstp->rq_res.head[0].iov_len;
Al Viroad451d32006-10-19 23:28:55 -0700610 rqstp->rq_res.head[0].iov_len += sizeof(__be32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 /* Now call the procedure handler, and encode NFS status. */
613 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
Andy Adamson32c1eb02007-07-17 04:04:48 -0700614 nfserr = map_new_errors(rqstp->rq_vers, nfserr);
J. Bruce Fields9e701c62011-01-02 21:56:36 -0500615 if (nfserr == nfserr_dropit || rqstp->rq_dropme) {
J. Bruce Fields45457e02007-06-22 17:26:32 -0400616 dprintk("nfsd: Dropping request; may be revisited later\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
618 return 0;
619 }
620
621 if (rqstp->rq_proc != 0)
622 *nfserrp++ = nfserr;
623
624 /* Encode result.
625 * For NFSv2, additional info is never returned in case of an error.
626 */
627 if (!(nfserr && rqstp->rq_vers == 2)) {
628 xdr = proc->pc_encode;
629 if (xdr && !xdr(rqstp, nfserrp,
630 rqstp->rq_resp)) {
631 /* Failed to encode result. Release cache entry */
632 dprintk("nfsd: failed to encode result!\n");
633 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
634 *statp = rpc_system_err;
635 return 1;
636 }
637 }
638
639 /* Store reply in cache. */
640 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
641 return 1;
642}
Greg Banks03cf6c92009-01-13 21:26:36 +1100643
644int nfsd_pool_stats_open(struct inode *inode, struct file *file)
645{
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +0900646 int ret;
647 mutex_lock(&nfsd_mutex);
648 if (nfsd_serv == NULL) {
649 mutex_unlock(&nfsd_mutex);
Greg Banks03cf6c92009-01-13 21:26:36 +1100650 return -ENODEV;
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +0900651 }
652 /* bump up the psudo refcount while traversing */
653 svc_get(nfsd_serv);
654 ret = svc_pool_stats_open(nfsd_serv, file);
655 mutex_unlock(&nfsd_mutex);
656 return ret;
657}
658
659int nfsd_pool_stats_release(struct inode *inode, struct file *file)
660{
661 int ret = seq_release(inode, file);
662 mutex_lock(&nfsd_mutex);
663 /* this function really, really should have been called svc_put() */
664 svc_destroy(nfsd_serv);
665 mutex_unlock(&nfsd_mutex);
666 return ret;
Greg Banks03cf6c92009-01-13 21:26:36 +1100667}