blob: 06b2a26edfe01736274e1d489988f73735f2913b [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/fs_struct.h>
Andy Adamsonc3d06f92009-04-03 08:28:18 +030012#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/sunrpc/stats.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/sunrpc/svcsock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/lockd/bind.h>
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000017#include <linux/nfsacl.h>
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +090018#include <linux/seq_file.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020019#include "nfsd.h"
20#include "cache.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050021#include "vfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#define NFSDDBG_FACILITY NFSDDBG_SVC
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025extern struct svc_program nfsd_program;
Jeff Layton9867d762008-06-10 08:40:38 -040026static int nfsd(void *vrqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070027struct timeval nfssvc_boot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Neil Brownbedbdd82008-06-10 08:40:35 -040029/*
30 * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members
31 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some
32 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt
33 *
34 * If (out side the lock) nfsd_serv is non-NULL, then it must point to a
35 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number
36 * of nfsd threads must exist and each must listed in ->sp_all_threads in each
37 * entry of ->sv_pools[].
38 *
39 * Transitions of the thread count between zero and non-zero are of particular
40 * interest since the svc_serv needs to be created and initialized at that
41 * point, or freed.
Jeff Layton3dd98a32008-06-10 08:40:36 -040042 *
43 * Finally, the nfsd_mutex also protects some of the global variables that are
44 * accessed when nfsd starts and that are settable via the write_* routines in
45 * nfsctl.c. In particular:
46 *
47 * user_recovery_dirname
48 * user_lease_time
49 * nfsd_versions
Neil Brownbedbdd82008-06-10 08:40:35 -040050 */
51DEFINE_MUTEX(nfsd_mutex);
52struct svc_serv *nfsd_serv;
53
Andy Adamson4bd9b0f2009-06-24 15:37:45 -040054/*
55 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used.
56 * nfsd_drc_max_pages limits the total amount of memory available for
57 * version 4.1 DRC caches.
58 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage.
59 */
60spinlock_t nfsd_drc_lock;
Andy Adamson0c193052009-07-27 19:09:19 -040061unsigned int nfsd_drc_max_mem;
62unsigned int nfsd_drc_mem_used;
Andy Adamson4bd9b0f2009-06-24 15:37:45 -040063
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080064#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
65static struct svc_stat nfsd_acl_svcstats;
66static struct svc_version * nfsd_acl_version[] = {
67 [2] = &nfsd_acl_version2,
68 [3] = &nfsd_acl_version3,
69};
70
71#define NFSD_ACL_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -080072#define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version)
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080073static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS];
74
75static struct svc_program nfsd_acl_program = {
76 .pg_prog = NFS_ACL_PROGRAM,
77 .pg_nvers = NFSD_ACL_NRVERS,
78 .pg_vers = nfsd_acl_versions,
NeilBrown1a8eff62007-01-26 00:56:58 -080079 .pg_name = "nfsacl",
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -080080 .pg_class = "nfsd",
81 .pg_stats = &nfsd_acl_svcstats,
82 .pg_authenticate = &svc_set_client,
83};
84
85static struct svc_stat nfsd_acl_svcstats = {
86 .program = &nfsd_acl_program,
87};
88#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
89
NeilBrown70c3b762005-11-07 01:00:25 -080090static struct svc_version * nfsd_version[] = {
91 [2] = &nfsd_version2,
92#if defined(CONFIG_NFSD_V3)
93 [3] = &nfsd_version3,
94#endif
95#if defined(CONFIG_NFSD_V4)
96 [4] = &nfsd_version4,
97#endif
98};
99
100#define NFSD_MINVERS 2
Tobias Klausere8c96f82006-03-24 03:15:34 -0800101#define NFSD_NRVERS ARRAY_SIZE(nfsd_version)
NeilBrown70c3b762005-11-07 01:00:25 -0800102static struct svc_version *nfsd_versions[NFSD_NRVERS];
103
104struct svc_program nfsd_program = {
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800105#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
106 .pg_next = &nfsd_acl_program,
107#endif
NeilBrown70c3b762005-11-07 01:00:25 -0800108 .pg_prog = NFS_PROGRAM, /* program number */
109 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
110 .pg_vers = nfsd_versions, /* version table */
111 .pg_name = "nfsd", /* program name */
112 .pg_class = "nfsd", /* authentication class */
113 .pg_stats = &nfsd_svcstats, /* version table */
114 .pg_authenticate = &svc_set_client, /* export authentication */
115
116};
117
Benny Halevy8daf2202009-04-03 08:28:59 +0300118u32 nfsd_supported_minorversion;
119
NeilBrown6658d3a2006-10-02 02:17:46 -0700120int nfsd_vers(int vers, enum vers_op change)
121{
122 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)
Pavel Emelyanov15ddb4a2010-05-14 15:33:36 +0400123 return 0;
NeilBrown6658d3a2006-10-02 02:17:46 -0700124 switch(change) {
125 case NFSD_SET:
126 nfsd_versions[vers] = nfsd_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700127#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
128 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800129 nfsd_acl_versions[vers] = nfsd_acl_version[vers];
NeilBrown6658d3a2006-10-02 02:17:46 -0700130#endif
NeilBrown1a8eff62007-01-26 00:56:58 -0800131 break;
NeilBrown6658d3a2006-10-02 02:17:46 -0700132 case NFSD_CLEAR:
133 nfsd_versions[vers] = NULL;
134#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
135 if (vers < NFSD_ACL_NRVERS)
NeilBrown1a8eff62007-01-26 00:56:58 -0800136 nfsd_acl_versions[vers] = NULL;
NeilBrown6658d3a2006-10-02 02:17:46 -0700137#endif
138 break;
139 case NFSD_TEST:
140 return nfsd_versions[vers] != NULL;
141 case NFSD_AVAIL:
142 return nfsd_version[vers] != NULL;
143 }
144 return 0;
145}
Benny Halevy8daf2202009-04-03 08:28:59 +0300146
147int nfsd_minorversion(u32 minorversion, enum vers_op change)
148{
149 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION)
150 return -1;
151 switch(change) {
152 case NFSD_SET:
153 nfsd_supported_minorversion = minorversion;
154 break;
155 case NFSD_CLEAR:
156 if (minorversion == 0)
157 return -1;
158 nfsd_supported_minorversion = minorversion - 1;
159 break;
160 case NFSD_TEST:
161 return minorversion <= nfsd_supported_minorversion;
162 case NFSD_AVAIL:
163 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION;
164 }
165 return 0;
166}
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168/*
169 * Maximum number of nfsd processes
170 */
171#define NFSD_MAXSERVS 8192
172
173int nfsd_nrthreads(void)
174{
Neil Brownc7d106c2008-06-12 13:38:42 +1000175 int rv = 0;
176 mutex_lock(&nfsd_mutex);
177 if (nfsd_serv)
178 rv = nfsd_serv->sv_nrthreads;
179 mutex_unlock(&nfsd_mutex);
180 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181}
182
NeilBrownbc591cc2006-10-02 02:17:44 -0700183static void nfsd_last_thread(struct svc_serv *serv)
184{
185 /* When last nfsd thread exits we need to do some clean-up */
Tom Tucker7a182082007-12-30 21:07:53 -0600186 struct svc_xprt *xprt;
187 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list)
NeilBrown24e36662006-10-02 02:17:45 -0700188 lockd_down();
NeilBrownbc591cc2006-10-02 02:17:44 -0700189 nfsd_serv = NULL;
190 nfsd_racache_shutdown();
191 nfs4_state_shutdown();
192
Jeff Laytone096bbc2008-06-10 08:40:37 -0400193 printk(KERN_WARNING "nfsd: last server has exited, flushing export "
194 "cache\n");
195 nfsd_export_flush();
NeilBrownbc591cc2006-10-02 02:17:44 -0700196}
NeilBrown6658d3a2006-10-02 02:17:46 -0700197
198void nfsd_reset_versions(void)
199{
200 int found_one = 0;
201 int i;
202
203 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
204 if (nfsd_program.pg_vers[i])
205 found_one = 1;
206 }
207
208 if (!found_one) {
209 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
210 nfsd_program.pg_vers[i] = nfsd_version[i];
211#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
212 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)
213 nfsd_acl_program.pg_vers[i] =
214 nfsd_acl_version[i];
215#endif
216 }
217}
218
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300219/*
220 * Each session guarantees a negotiated per slot memory cache for replies
221 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated
222 * NFSv4.1 server might want to use more memory for a DRC than a machine
223 * with mutiple services.
224 *
225 * Impose a hard limit on the number of pages for the DRC which varies
226 * according to the machines free pages. This is of course only a default.
227 *
228 * For now this is a #defined shift which could be under admin control
229 * in the future.
230 */
231static void set_max_drc(void)
232{
Andy Adamson6a14dd12009-07-27 19:06:45 -0400233 #define NFSD_DRC_SIZE_SHIFT 10
Andy Adamson0c193052009-07-27 19:09:19 -0400234 nfsd_drc_max_mem = (nr_free_buffer_pages()
235 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE;
236 nfsd_drc_mem_used = 0;
Andy Adamson4bd9b0f2009-06-24 15:37:45 -0400237 spin_lock_init(&nfsd_drc_lock);
Andy Adamson0c193052009-07-27 19:09:19 -0400238 dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem);
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300239}
Neil Brownbedbdd82008-06-10 08:40:35 -0400240
NeilBrownb41b66d2006-10-02 02:17:48 -0700241int nfsd_create_serv(void)
NeilBrown02a375f2006-10-02 02:17:46 -0700242{
243 int err = 0;
Neil Brownbedbdd82008-06-10 08:40:35 -0400244
245 WARN_ON(!mutex_is_locked(&nfsd_mutex));
NeilBrown02a375f2006-10-02 02:17:46 -0700246 if (nfsd_serv) {
Greg Banks9a24ab52006-10-02 02:17:58 -0700247 svc_get(nfsd_serv);
NeilBrown02a375f2006-10-02 02:17:46 -0700248 return 0;
249 }
NeilBrown596bbe52006-10-04 02:15:48 -0700250 if (nfsd_max_blksize == 0) {
251 /* choose a suitable default */
252 struct sysinfo i;
253 si_meminfo(&i);
254 /* Aim for 1/4096 of memory per thread
255 * This gives 1MB on 4Gig machines
256 * But only uses 32K on 128M machines.
257 * Bottom out at 8K on 32M and smaller.
258 * Of course, this is only a default.
259 */
260 nfsd_max_blksize = NFSSVC_MAXBLKSIZE;
NeilBrown44c55602006-10-04 02:16:15 -0700261 i.totalram <<= PAGE_SHIFT - 12;
NeilBrown596bbe52006-10-04 02:15:48 -0700262 while (nfsd_max_blksize > i.totalram &&
263 nfsd_max_blksize >= 8*1024*2)
264 nfsd_max_blksize /= 2;
265 }
NeilBrown02a375f2006-10-02 02:17:46 -0700266
Jeff Laytone096bbc2008-06-10 08:40:37 -0400267 nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize,
Jeff Laytona75c5d02008-06-10 08:40:39 -0400268 nfsd_last_thread, nfsd, THIS_MODULE);
NeilBrown02a375f2006-10-02 02:17:46 -0700269 if (nfsd_serv == NULL)
270 err = -ENOMEM;
Andy Adamsonc3d06f92009-04-03 08:28:18 +0300271 else
272 set_max_drc();
Neil Brownbedbdd82008-06-10 08:40:35 -0400273
NeilBrown02a375f2006-10-02 02:17:46 -0700274 do_gettimeofday(&nfssvc_boot); /* record boot time */
275 return err;
276}
277
278static int nfsd_init_socks(int port)
279{
280 int error;
281 if (!list_empty(&nfsd_serv->sv_permsocks))
282 return 0;
283
Chuck Lever9652ada2009-03-18 20:46:21 -0400284 error = svc_create_xprt(nfsd_serv, "udp", PF_INET, port,
Chuck Lever482fb942007-02-12 00:53:29 -0800285 SVC_SOCK_DEFAULTS);
NeilBrown02a375f2006-10-02 02:17:46 -0700286 if (error < 0)
287 return error;
288
Chuck Lever1cd9cd12008-10-22 13:12:36 -0400289 error = lockd_up();
290 if (error < 0)
291 return error;
292
Chuck Lever9652ada2009-03-18 20:46:21 -0400293 error = svc_create_xprt(nfsd_serv, "tcp", PF_INET, port,
Chuck Lever482fb942007-02-12 00:53:29 -0800294 SVC_SOCK_DEFAULTS);
NeilBrown02a375f2006-10-02 02:17:46 -0700295 if (error < 0)
296 return error;
Chuck Lever26a41402008-10-03 17:15:30 -0400297
298 error = lockd_up();
299 if (error < 0)
300 return error;
301
NeilBrown02a375f2006-10-02 02:17:46 -0700302 return 0;
303}
304
Greg Bankseed29652006-10-02 02:18:02 -0700305int nfsd_nrpools(void)
306{
307 if (nfsd_serv == NULL)
308 return 0;
309 else
310 return nfsd_serv->sv_nrpools;
311}
312
313int nfsd_get_nrthreads(int n, int *nthreads)
314{
315 int i = 0;
316
317 if (nfsd_serv != NULL) {
318 for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++)
319 nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads;
320 }
321
322 return 0;
323}
324
325int nfsd_set_nrthreads(int n, int *nthreads)
326{
327 int i = 0;
328 int tot = 0;
329 int err = 0;
330
Neil Brownbedbdd82008-06-10 08:40:35 -0400331 WARN_ON(!mutex_is_locked(&nfsd_mutex));
332
Greg Bankseed29652006-10-02 02:18:02 -0700333 if (nfsd_serv == NULL || n <= 0)
334 return 0;
335
336 if (n > nfsd_serv->sv_nrpools)
337 n = nfsd_serv->sv_nrpools;
338
339 /* enforce a global maximum number of threads */
340 tot = 0;
341 for (i = 0; i < n; i++) {
342 if (nthreads[i] > NFSD_MAXSERVS)
343 nthreads[i] = NFSD_MAXSERVS;
344 tot += nthreads[i];
345 }
346 if (tot > NFSD_MAXSERVS) {
347 /* total too large: scale down requested numbers */
348 for (i = 0; i < n && tot > 0; i++) {
349 int new = nthreads[i] * NFSD_MAXSERVS / tot;
350 tot -= (nthreads[i] - new);
351 nthreads[i] = new;
352 }
353 for (i = 0; i < n && tot > 0; i++) {
354 nthreads[i]--;
355 tot--;
356 }
357 }
358
359 /*
360 * There must always be a thread in pool 0; the admin
361 * can't shut down NFS completely using pool_threads.
362 */
363 if (nthreads[0] == 0)
364 nthreads[0] = 1;
365
366 /* apply the new numbers */
Greg Bankseed29652006-10-02 02:18:02 -0700367 svc_get(nfsd_serv);
368 for (i = 0; i < n; i++) {
369 err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i],
370 nthreads[i]);
371 if (err)
372 break;
373 }
374 svc_destroy(nfsd_serv);
Greg Bankseed29652006-10-02 02:18:02 -0700375
376 return err;
377}
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379int
380nfsd_svc(unsigned short port, int nrservs)
381{
382 int error;
Neil Brownbedbdd82008-06-10 08:40:35 -0400383
384 mutex_lock(&nfsd_mutex);
NeilBrown6658d3a2006-10-02 02:17:46 -0700385 dprintk("nfsd: creating service\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 if (nrservs <= 0)
387 nrservs = 0;
388 if (nrservs > NFSD_MAXSERVS)
389 nrservs = NFSD_MAXSERVS;
NeilBrown671e1fc2009-06-16 11:03:20 +1000390 error = 0;
391 if (nrservs == 0 && nfsd_serv == NULL)
392 goto out;
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 /* Readahead param cache - will no-op if it already exists */
395 error = nfsd_racache_init(2*nrservs);
396 if (error<0)
397 goto out;
J. Bruce Fields29ab23c2009-09-15 15:56:50 -0400398 error = nfs4_state_start();
399 if (error)
400 goto out;
Andreas Gruenbacher3fb803a2006-02-01 03:04:34 -0800401
NeilBrown02a375f2006-10-02 02:17:46 -0700402 nfsd_reset_versions();
403
404 error = nfsd_create_serv();
405
406 if (error)
407 goto out;
408 error = nfsd_init_socks(port);
409 if (error)
410 goto failure;
411
Greg Bankseec09662006-10-02 02:18:00 -0700412 error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
NeilBrown82e12fe2009-06-16 11:03:07 +1000413 if (error == 0)
414 /* We are holding a reference to nfsd_serv which
415 * we don't want to count in the return value,
416 * so subtract 1
417 */
418 error = nfsd_serv->sv_nrthreads - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 failure:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 svc_destroy(nfsd_serv); /* Release server */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 out:
Neil Brownbedbdd82008-06-10 08:40:35 -0400422 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 return error;
424}
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
427/*
428 * This is the NFS server kernel thread
429 */
Jeff Layton9867d762008-06-10 08:40:38 -0400430static int
431nfsd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432{
Jeff Layton9867d762008-06-10 08:40:38 -0400433 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp;
Jeff Layton9867d762008-06-10 08:40:38 -0400434 int err, preverr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 /* Lock module and set up kernel thread */
Neil Brownbedbdd82008-06-10 08:40:35 -0400437 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
Jeff Layton9867d762008-06-10 08:40:38 -0400439 /* At this point, the thread shares current->fs
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 * with the init process. We need to create files with a
441 * umask of 0 instead of init's umask. */
Al Viro3e93cd62009-03-29 19:00:13 -0400442 if (unshare_fs_struct() < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 printk("Unable to start nfsd thread: out of memory\n");
444 goto out;
445 }
Al Viro3e93cd62009-03-29 19:00:13 -0400446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 current->fs->umask = 0;
448
Jeff Layton9867d762008-06-10 08:40:38 -0400449 /*
450 * thread is spawned with all signals set to SIG_IGN, re-enable
Jeff Layton100766f2008-06-30 14:09:46 -0400451 * the ones that will bring down the thread
Jeff Layton9867d762008-06-10 08:40:38 -0400452 */
Jeff Layton100766f2008-06-30 14:09:46 -0400453 allow_signal(SIGKILL);
454 allow_signal(SIGHUP);
455 allow_signal(SIGINT);
456 allow_signal(SIGQUIT);
Neil Brownbedbdd82008-06-10 08:40:35 -0400457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 nfsdstats.th_cnt++;
Neil Brownbedbdd82008-06-10 08:40:35 -0400459 mutex_unlock(&nfsd_mutex);
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 /*
462 * We want less throttling in balance_dirty_pages() so that nfs to
463 * localhost doesn't cause nfsd to lock up due to all the client's
464 * dirty pages.
465 */
466 current->flags |= PF_LESS_THROTTLE;
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700467 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 /*
470 * The main request loop
471 */
472 for (;;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 /*
474 * Find a socket with data available and call its
475 * recvfrom routine.
476 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700477 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 ;
Jeff Layton9867d762008-06-10 08:40:38 -0400479 if (err == -EINTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 break;
Jeff Layton9867d762008-06-10 08:40:38 -0400481 else if (err < 0) {
482 if (err != preverr) {
483 printk(KERN_WARNING "%s: unexpected error "
484 "from svc_recv (%d)\n", __func__, -err);
485 preverr = err;
486 }
487 schedule_timeout_uninterruptible(HZ);
488 continue;
489 }
490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
492 /* Lock the export hash tables for reading. */
493 exp_readlock();
494
David Howellse0e81732009-09-02 09:13:40 +0100495 validate_process_creds();
NeilBrown6fb2b472006-10-02 02:17:50 -0700496 svc_process(rqstp);
David Howellse0e81732009-09-02 09:13:40 +0100497 validate_process_creds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
499 /* Unlock export hash tables */
500 exp_readunlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 }
502
NeilBrown24e36662006-10-02 02:17:45 -0700503 /* Clear signals before calling svc_exit_thread() */
NeilBrown9e416052005-04-16 15:26:37 -0700504 flush_signals(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
Neil Brownbedbdd82008-06-10 08:40:35 -0400506 mutex_lock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 nfsdstats.th_cnt --;
508
509out:
510 /* Release the thread */
511 svc_exit_thread(rqstp);
512
513 /* Release module */
Neil Brownbedbdd82008-06-10 08:40:35 -0400514 mutex_unlock(&nfsd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 module_put_and_exit(0);
Jeff Layton9867d762008-06-10 08:40:38 -0400516 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
518
Andy Adamson32c1eb02007-07-17 04:04:48 -0700519static __be32 map_new_errors(u32 vers, __be32 nfserr)
520{
521 if (nfserr == nfserr_jukebox && vers == 2)
522 return nfserr_dropit;
523 if (nfserr == nfserr_wrongsec && vers < 4)
524 return nfserr_acces;
525 return nfserr;
526}
527
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528int
Al Viroc7afef12006-10-19 23:29:02 -0700529nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530{
531 struct svc_procedure *proc;
532 kxdrproc_t xdr;
Al Viroad451d32006-10-19 23:28:55 -0700533 __be32 nfserr;
534 __be32 *nfserrp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536 dprintk("nfsd_dispatch: vers %d proc %d\n",
537 rqstp->rq_vers, rqstp->rq_proc);
538 proc = rqstp->rq_procinfo;
539
540 /* Check whether we have this call in the cache. */
541 switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
542 case RC_INTR:
543 case RC_DROPIT:
544 return 0;
545 case RC_REPLY:
546 return 1;
547 case RC_DOIT:;
548 /* do it */
549 }
550
551 /* Decode arguments */
552 xdr = proc->pc_decode;
Al Viroad451d32006-10-19 23:28:55 -0700553 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 rqstp->rq_argp)) {
555 dprintk("nfsd: failed to decode arguments!\n");
556 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
557 *statp = rpc_garbage_args;
558 return 1;
559 }
560
561 /* need to grab the location to store the status, as
562 * nfsv4 does some encoding while processing
563 */
564 nfserrp = rqstp->rq_res.head[0].iov_base
565 + rqstp->rq_res.head[0].iov_len;
Al Viroad451d32006-10-19 23:28:55 -0700566 rqstp->rq_res.head[0].iov_len += sizeof(__be32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
568 /* Now call the procedure handler, and encode NFS status. */
569 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
Andy Adamson32c1eb02007-07-17 04:04:48 -0700570 nfserr = map_new_errors(rqstp->rq_vers, nfserr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 if (nfserr == nfserr_dropit) {
J. Bruce Fields45457e02007-06-22 17:26:32 -0400572 dprintk("nfsd: Dropping request; may be revisited later\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
574 return 0;
575 }
576
577 if (rqstp->rq_proc != 0)
578 *nfserrp++ = nfserr;
579
580 /* Encode result.
581 * For NFSv2, additional info is never returned in case of an error.
582 */
583 if (!(nfserr && rqstp->rq_vers == 2)) {
584 xdr = proc->pc_encode;
585 if (xdr && !xdr(rqstp, nfserrp,
586 rqstp->rq_resp)) {
587 /* Failed to encode result. Release cache entry */
588 dprintk("nfsd: failed to encode result!\n");
589 nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
590 *statp = rpc_system_err;
591 return 1;
592 }
593 }
594
595 /* Store reply in cache. */
596 nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
597 return 1;
598}
Greg Banks03cf6c92009-01-13 21:26:36 +1100599
600int nfsd_pool_stats_open(struct inode *inode, struct file *file)
601{
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +0900602 int ret;
603 mutex_lock(&nfsd_mutex);
604 if (nfsd_serv == NULL) {
605 mutex_unlock(&nfsd_mutex);
Greg Banks03cf6c92009-01-13 21:26:36 +1100606 return -ENODEV;
Ryusei Yamaguchied2d8ae2009-08-16 00:54:41 +0900607 }
608 /* bump up the psudo refcount while traversing */
609 svc_get(nfsd_serv);
610 ret = svc_pool_stats_open(nfsd_serv, file);
611 mutex_unlock(&nfsd_mutex);
612 return ret;
613}
614
615int nfsd_pool_stats_release(struct inode *inode, struct file *file)
616{
617 int ret = seq_release(inode, file);
618 mutex_lock(&nfsd_mutex);
619 /* this function really, really should have been called svc_put() */
620 svc_destroy(nfsd_serv);
621 mutex_unlock(&nfsd_mutex);
622 return ret;
Greg Banks03cf6c92009-01-13 21:26:36 +1100623}