Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * 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 Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 9 | #include <linux/sched.h> |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 10 | #include <linux/freezer.h> |
Paul Gortmaker | 143cb49 | 2011-07-01 14:23:34 -0400 | [diff] [blame] | 11 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/fs_struct.h> |
Andy Adamson | c3d06f9 | 2009-04-03 08:28:18 +0300 | [diff] [blame] | 13 | #include <linux/swap.h> |
Stanislav Kinsbursky | 9793f7c | 2012-05-02 16:08:38 +0400 | [diff] [blame] | 14 | #include <linux/nsproxy.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/sunrpc/stats.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/sunrpc/svcsock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/lockd/bind.h> |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 19 | #include <linux/nfsacl.h> |
Ryusei Yamaguchi | ed2d8ae | 2009-08-16 00:54:41 +0900 | [diff] [blame] | 20 | #include <linux/seq_file.h> |
Pavel Emelyanov | fc5d00b | 2010-09-29 16:03:50 +0400 | [diff] [blame] | 21 | #include <net/net_namespace.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 22 | #include "nfsd.h" |
| 23 | #include "cache.h" |
J. Bruce Fields | 0a3adad | 2009-11-04 18:12:35 -0500 | [diff] [blame] | 24 | #include "vfs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #define NFSDDBG_FACILITY NFSDDBG_SVC |
| 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | extern struct svc_program nfsd_program; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 29 | static int nfsd(void *vrqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | struct timeval nfssvc_boot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 32 | /* |
| 33 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members |
| 34 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some |
| 35 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt |
| 36 | * |
| 37 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a |
| 38 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number |
| 39 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each |
| 40 | * entry of ->sv_pools[]. |
| 41 | * |
| 42 | * Transitions of the thread count between zero and non-zero are of particular |
| 43 | * interest since the svc_serv needs to be created and initialized at that |
| 44 | * point, or freed. |
Jeff Layton | 3dd98a3 | 2008-06-10 08:40:36 -0400 | [diff] [blame] | 45 | * |
| 46 | * Finally, the nfsd_mutex also protects some of the global variables that are |
| 47 | * accessed when nfsd starts and that are settable via the write_* routines in |
| 48 | * nfsctl.c. In particular: |
| 49 | * |
| 50 | * user_recovery_dirname |
| 51 | * user_lease_time |
| 52 | * nfsd_versions |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 53 | */ |
| 54 | DEFINE_MUTEX(nfsd_mutex); |
| 55 | struct svc_serv *nfsd_serv; |
| 56 | |
Andy Adamson | 4bd9b0f4 | 2009-06-24 15:37:45 -0400 | [diff] [blame] | 57 | /* |
| 58 | * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. |
| 59 | * nfsd_drc_max_pages limits the total amount of memory available for |
| 60 | * version 4.1 DRC caches. |
| 61 | * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. |
| 62 | */ |
| 63 | spinlock_t nfsd_drc_lock; |
Andy Adamson | 0c19305 | 2009-07-27 19:09:19 -0400 | [diff] [blame] | 64 | unsigned int nfsd_drc_max_mem; |
| 65 | unsigned int nfsd_drc_mem_used; |
Andy Adamson | 4bd9b0f4 | 2009-06-24 15:37:45 -0400 | [diff] [blame] | 66 | |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 67 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 68 | static struct svc_stat nfsd_acl_svcstats; |
| 69 | static struct svc_version * nfsd_acl_version[] = { |
| 70 | [2] = &nfsd_acl_version2, |
| 71 | [3] = &nfsd_acl_version3, |
| 72 | }; |
| 73 | |
| 74 | #define NFSD_ACL_MINVERS 2 |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 75 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 76 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
| 77 | |
| 78 | static struct svc_program nfsd_acl_program = { |
| 79 | .pg_prog = NFS_ACL_PROGRAM, |
| 80 | .pg_nvers = NFSD_ACL_NRVERS, |
| 81 | .pg_vers = nfsd_acl_versions, |
NeilBrown | 1a8eff6 | 2007-01-26 00:56:58 -0800 | [diff] [blame] | 82 | .pg_name = "nfsacl", |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 83 | .pg_class = "nfsd", |
| 84 | .pg_stats = &nfsd_acl_svcstats, |
| 85 | .pg_authenticate = &svc_set_client, |
| 86 | }; |
| 87 | |
| 88 | static struct svc_stat nfsd_acl_svcstats = { |
| 89 | .program = &nfsd_acl_program, |
| 90 | }; |
| 91 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |
| 92 | |
NeilBrown | 70c3b76 | 2005-11-07 01:00:25 -0800 | [diff] [blame] | 93 | static struct svc_version * nfsd_version[] = { |
| 94 | [2] = &nfsd_version2, |
| 95 | #if defined(CONFIG_NFSD_V3) |
| 96 | [3] = &nfsd_version3, |
| 97 | #endif |
| 98 | #if defined(CONFIG_NFSD_V4) |
| 99 | [4] = &nfsd_version4, |
| 100 | #endif |
| 101 | }; |
| 102 | |
| 103 | #define NFSD_MINVERS 2 |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 104 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
NeilBrown | 70c3b76 | 2005-11-07 01:00:25 -0800 | [diff] [blame] | 105 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
| 106 | |
| 107 | struct svc_program nfsd_program = { |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 108 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 109 | .pg_next = &nfsd_acl_program, |
| 110 | #endif |
NeilBrown | 70c3b76 | 2005-11-07 01:00:25 -0800 | [diff] [blame] | 111 | .pg_prog = NFS_PROGRAM, /* program number */ |
| 112 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ |
| 113 | .pg_vers = nfsd_versions, /* version table */ |
| 114 | .pg_name = "nfsd", /* program name */ |
| 115 | .pg_class = "nfsd", /* authentication class */ |
| 116 | .pg_stats = &nfsd_svcstats, /* version table */ |
| 117 | .pg_authenticate = &svc_set_client, /* export authentication */ |
| 118 | |
| 119 | }; |
| 120 | |
Benny Halevy | 8daf220 | 2009-04-03 08:28:59 +0300 | [diff] [blame] | 121 | u32 nfsd_supported_minorversion; |
| 122 | |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 123 | int nfsd_vers(int vers, enum vers_op change) |
| 124 | { |
| 125 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) |
Pavel Emelyanov | 15ddb4a | 2010-05-14 15:33:36 +0400 | [diff] [blame] | 126 | return 0; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 127 | switch(change) { |
| 128 | case NFSD_SET: |
| 129 | nfsd_versions[vers] = nfsd_version[vers]; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 130 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 131 | if (vers < NFSD_ACL_NRVERS) |
NeilBrown | 1a8eff6 | 2007-01-26 00:56:58 -0800 | [diff] [blame] | 132 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 133 | #endif |
NeilBrown | 1a8eff6 | 2007-01-26 00:56:58 -0800 | [diff] [blame] | 134 | break; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 135 | case NFSD_CLEAR: |
| 136 | nfsd_versions[vers] = NULL; |
| 137 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 138 | if (vers < NFSD_ACL_NRVERS) |
NeilBrown | 1a8eff6 | 2007-01-26 00:56:58 -0800 | [diff] [blame] | 139 | nfsd_acl_versions[vers] = NULL; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 140 | #endif |
| 141 | break; |
| 142 | case NFSD_TEST: |
| 143 | return nfsd_versions[vers] != NULL; |
| 144 | case NFSD_AVAIL: |
| 145 | return nfsd_version[vers] != NULL; |
| 146 | } |
| 147 | return 0; |
| 148 | } |
Benny Halevy | 8daf220 | 2009-04-03 08:28:59 +0300 | [diff] [blame] | 149 | |
| 150 | int nfsd_minorversion(u32 minorversion, enum vers_op change) |
| 151 | { |
| 152 | if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) |
| 153 | return -1; |
| 154 | switch(change) { |
| 155 | case NFSD_SET: |
| 156 | nfsd_supported_minorversion = minorversion; |
| 157 | break; |
| 158 | case NFSD_CLEAR: |
| 159 | if (minorversion == 0) |
| 160 | return -1; |
| 161 | nfsd_supported_minorversion = minorversion - 1; |
| 162 | break; |
| 163 | case NFSD_TEST: |
| 164 | return minorversion <= nfsd_supported_minorversion; |
| 165 | case NFSD_AVAIL: |
| 166 | return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; |
| 167 | } |
| 168 | return 0; |
| 169 | } |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | /* |
| 172 | * Maximum number of nfsd processes |
| 173 | */ |
| 174 | #define NFSD_MAXSERVS 8192 |
| 175 | |
| 176 | int nfsd_nrthreads(void) |
| 177 | { |
Neil Brown | c7d106c | 2008-06-12 13:38:42 +1000 | [diff] [blame] | 178 | int rv = 0; |
| 179 | mutex_lock(&nfsd_mutex); |
| 180 | if (nfsd_serv) |
| 181 | rv = nfsd_serv->sv_nrthreads; |
| 182 | mutex_unlock(&nfsd_mutex); |
| 183 | return rv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | } |
| 185 | |
J. Bruce Fields | 59db4a0 | 2010-07-21 18:29:25 -0400 | [diff] [blame] | 186 | static int nfsd_init_socks(int port) |
| 187 | { |
| 188 | int error; |
| 189 | if (!list_empty(&nfsd_serv->sv_permsocks)) |
| 190 | return 0; |
| 191 | |
Pavel Emelyanov | fc5d00b | 2010-09-29 16:03:50 +0400 | [diff] [blame] | 192 | error = svc_create_xprt(nfsd_serv, "udp", &init_net, PF_INET, port, |
J. Bruce Fields | 59db4a0 | 2010-07-21 18:29:25 -0400 | [diff] [blame] | 193 | SVC_SOCK_DEFAULTS); |
| 194 | if (error < 0) |
| 195 | return error; |
| 196 | |
Pavel Emelyanov | fc5d00b | 2010-09-29 16:03:50 +0400 | [diff] [blame] | 197 | error = svc_create_xprt(nfsd_serv, "tcp", &init_net, PF_INET, port, |
J. Bruce Fields | 59db4a0 | 2010-07-21 18:29:25 -0400 | [diff] [blame] | 198 | SVC_SOCK_DEFAULTS); |
| 199 | if (error < 0) |
| 200 | return error; |
| 201 | |
| 202 | return 0; |
| 203 | } |
| 204 | |
Jeff Layton | 4ad9a34 | 2010-07-19 16:50:04 -0400 | [diff] [blame] | 205 | static bool nfsd_up = false; |
| 206 | |
| 207 | static int nfsd_startup(unsigned short port, int nrservs) |
| 208 | { |
| 209 | int ret; |
J. Bruce Fields | 774f8bb | 2010-08-02 14:12:44 -0400 | [diff] [blame] | 210 | |
| 211 | if (nfsd_up) |
| 212 | return 0; |
J. Bruce Fields | 59db4a0 | 2010-07-21 18:29:25 -0400 | [diff] [blame] | 213 | /* |
| 214 | * Readahead param cache - will no-op if it already exists. |
| 215 | * (Note therefore results will be suboptimal if number of |
| 216 | * threads is modified after nfsd start.) |
| 217 | */ |
| 218 | ret = nfsd_racache_init(2*nrservs); |
| 219 | if (ret) |
| 220 | return ret; |
| 221 | ret = nfsd_init_socks(port); |
| 222 | if (ret) |
| 223 | goto out_racache; |
Stanislav Kinsbursky | e3f70ea | 2012-03-29 18:54:33 +0400 | [diff] [blame] | 224 | ret = lockd_up(&init_net); |
Jeff Layton | ac77efb | 2010-07-20 14:10:22 -0400 | [diff] [blame] | 225 | if (ret) |
J. Bruce Fields | 774f8bb | 2010-08-02 14:12:44 -0400 | [diff] [blame] | 226 | goto out_racache; |
Jeff Layton | 4ad9a34 | 2010-07-19 16:50:04 -0400 | [diff] [blame] | 227 | ret = nfs4_state_start(); |
Jeff Layton | ac77efb | 2010-07-20 14:10:22 -0400 | [diff] [blame] | 228 | if (ret) |
| 229 | goto out_lockd; |
Jeff Layton | 4ad9a34 | 2010-07-19 16:50:04 -0400 | [diff] [blame] | 230 | nfsd_up = true; |
Jeff Layton | ac77efb | 2010-07-20 14:10:22 -0400 | [diff] [blame] | 231 | return 0; |
| 232 | out_lockd: |
Stanislav Kinsbursky | e3f70ea | 2012-03-29 18:54:33 +0400 | [diff] [blame] | 233 | lockd_down(&init_net); |
J. Bruce Fields | 59db4a0 | 2010-07-21 18:29:25 -0400 | [diff] [blame] | 234 | out_racache: |
| 235 | nfsd_racache_shutdown(); |
Jeff Layton | 4ad9a34 | 2010-07-19 16:50:04 -0400 | [diff] [blame] | 236 | return ret; |
| 237 | } |
| 238 | |
| 239 | static void nfsd_shutdown(void) |
| 240 | { |
| 241 | /* |
| 242 | * write_ports can create the server without actually starting |
| 243 | * any threads--if we get shut down before any threads are |
| 244 | * started, then nfsd_last_thread will be run before any of this |
| 245 | * other initialization has been done. |
| 246 | */ |
| 247 | if (!nfsd_up) |
| 248 | return; |
| 249 | nfs4_state_shutdown(); |
Stanislav Kinsbursky | e3f70ea | 2012-03-29 18:54:33 +0400 | [diff] [blame] | 250 | lockd_down(&init_net); |
J. Bruce Fields | 59db4a0 | 2010-07-21 18:29:25 -0400 | [diff] [blame] | 251 | nfsd_racache_shutdown(); |
Jeff Layton | 4ad9a34 | 2010-07-19 16:50:04 -0400 | [diff] [blame] | 252 | nfsd_up = false; |
| 253 | } |
| 254 | |
Stanislav Kinsbursky | 5ecebb7 | 2012-01-13 14:03:04 +0400 | [diff] [blame] | 255 | static void nfsd_last_thread(struct svc_serv *serv, struct net *net) |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 256 | { |
| 257 | /* When last nfsd thread exits we need to do some clean-up */ |
| 258 | nfsd_serv = NULL; |
Jeff Layton | 4ad9a34 | 2010-07-19 16:50:04 -0400 | [diff] [blame] | 259 | nfsd_shutdown(); |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 260 | |
Stanislav Kinsbursky | 5ecebb7 | 2012-01-13 14:03:04 +0400 | [diff] [blame] | 261 | svc_rpcb_cleanup(serv, net); |
Stanislav Kinsbursky | 16d0587 | 2011-10-25 14:17:28 +0300 | [diff] [blame] | 262 | |
Jeff Layton | e096bbc | 2008-06-10 08:40:37 -0400 | [diff] [blame] | 263 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
| 264 | "cache\n"); |
Stanislav Kinsbursky | b3853e0 | 2012-04-11 15:13:21 +0400 | [diff] [blame] | 265 | nfsd_export_flush(net); |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 266 | } |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 267 | |
| 268 | void nfsd_reset_versions(void) |
| 269 | { |
| 270 | int found_one = 0; |
| 271 | int i; |
| 272 | |
| 273 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { |
| 274 | if (nfsd_program.pg_vers[i]) |
| 275 | found_one = 1; |
| 276 | } |
| 277 | |
| 278 | if (!found_one) { |
| 279 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) |
| 280 | nfsd_program.pg_vers[i] = nfsd_version[i]; |
| 281 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 282 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) |
| 283 | nfsd_acl_program.pg_vers[i] = |
| 284 | nfsd_acl_version[i]; |
| 285 | #endif |
| 286 | } |
| 287 | } |
| 288 | |
Andy Adamson | c3d06f9 | 2009-04-03 08:28:18 +0300 | [diff] [blame] | 289 | /* |
| 290 | * Each session guarantees a negotiated per slot memory cache for replies |
| 291 | * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated |
| 292 | * NFSv4.1 server might want to use more memory for a DRC than a machine |
| 293 | * with mutiple services. |
| 294 | * |
| 295 | * Impose a hard limit on the number of pages for the DRC which varies |
| 296 | * according to the machines free pages. This is of course only a default. |
| 297 | * |
| 298 | * For now this is a #defined shift which could be under admin control |
| 299 | * in the future. |
| 300 | */ |
| 301 | static void set_max_drc(void) |
| 302 | { |
Andy Adamson | 6a14dd1 | 2009-07-27 19:06:45 -0400 | [diff] [blame] | 303 | #define NFSD_DRC_SIZE_SHIFT 10 |
Andy Adamson | 0c19305 | 2009-07-27 19:09:19 -0400 | [diff] [blame] | 304 | nfsd_drc_max_mem = (nr_free_buffer_pages() |
| 305 | >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; |
| 306 | nfsd_drc_mem_used = 0; |
Andy Adamson | 4bd9b0f4 | 2009-06-24 15:37:45 -0400 | [diff] [blame] | 307 | spin_lock_init(&nfsd_drc_lock); |
Andy Adamson | 0c19305 | 2009-07-27 19:09:19 -0400 | [diff] [blame] | 308 | dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); |
Andy Adamson | c3d06f9 | 2009-04-03 08:28:18 +0300 | [diff] [blame] | 309 | } |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 310 | |
J. Bruce Fields | 87b0fc7 | 2012-01-30 16:18:35 -0500 | [diff] [blame] | 311 | static int nfsd_get_default_max_blksize(void) |
| 312 | { |
| 313 | struct sysinfo i; |
| 314 | unsigned long long target; |
| 315 | unsigned long ret; |
| 316 | |
| 317 | si_meminfo(&i); |
J. Bruce Fields | 508f922 | 2012-01-30 16:21:11 -0500 | [diff] [blame] | 318 | target = (i.totalram - i.totalhigh) << PAGE_SHIFT; |
J. Bruce Fields | 87b0fc7 | 2012-01-30 16:18:35 -0500 | [diff] [blame] | 319 | /* |
| 320 | * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig |
| 321 | * machines, but only uses 32K on 128M machines. Bottom out at |
| 322 | * 8K on 32M and smaller. Of course, this is only a default. |
| 323 | */ |
| 324 | target >>= 12; |
| 325 | |
| 326 | ret = NFSSVC_MAXBLKSIZE; |
| 327 | while (ret > target && ret >= 8*1024*2) |
| 328 | ret /= 2; |
| 329 | return ret; |
| 330 | } |
| 331 | |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 332 | int nfsd_create_serv(void) |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 333 | { |
Stanislav Kinsbursky | 9793f7c | 2012-05-02 16:08:38 +0400 | [diff] [blame] | 334 | int error; |
| 335 | |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 336 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 337 | if (nfsd_serv) { |
Greg Banks | 9a24ab5 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 338 | svc_get(nfsd_serv); |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 339 | return 0; |
| 340 | } |
J. Bruce Fields | 87b0fc7 | 2012-01-30 16:18:35 -0500 | [diff] [blame] | 341 | if (nfsd_max_blksize == 0) |
| 342 | nfsd_max_blksize = nfsd_get_default_max_blksize(); |
J. Bruce Fields | e844a7b | 2010-08-06 15:48:03 -0400 | [diff] [blame] | 343 | nfsd_reset_versions(); |
Jeff Layton | e096bbc | 2008-06-10 08:40:37 -0400 | [diff] [blame] | 344 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
Jeff Layton | a75c5d0 | 2008-06-10 08:40:39 -0400 | [diff] [blame] | 345 | nfsd_last_thread, nfsd, THIS_MODULE); |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 346 | if (nfsd_serv == NULL) |
Jeff Layton | 628b368 | 2010-07-21 16:40:08 -0400 | [diff] [blame] | 347 | return -ENOMEM; |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 348 | |
Stanislav Kinsbursky | 9793f7c | 2012-05-02 16:08:38 +0400 | [diff] [blame] | 349 | error = svc_bind(nfsd_serv, current->nsproxy->net_ns); |
| 350 | if (error < 0) { |
| 351 | svc_destroy(nfsd_serv); |
| 352 | return error; |
| 353 | } |
| 354 | |
Jeff Layton | 628b368 | 2010-07-21 16:40:08 -0400 | [diff] [blame] | 355 | set_max_drc(); |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 356 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
J. Bruce Fields | 87b0fc7 | 2012-01-30 16:18:35 -0500 | [diff] [blame] | 357 | return 0; |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 360 | int nfsd_nrpools(void) |
| 361 | { |
| 362 | if (nfsd_serv == NULL) |
| 363 | return 0; |
| 364 | else |
| 365 | return nfsd_serv->sv_nrpools; |
| 366 | } |
| 367 | |
| 368 | int nfsd_get_nrthreads(int n, int *nthreads) |
| 369 | { |
| 370 | int i = 0; |
| 371 | |
| 372 | if (nfsd_serv != NULL) { |
| 373 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) |
| 374 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; |
| 375 | } |
| 376 | |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | int nfsd_set_nrthreads(int n, int *nthreads) |
| 381 | { |
| 382 | int i = 0; |
| 383 | int tot = 0; |
| 384 | int err = 0; |
Stanislav Kinsbursky | 786185b | 2012-05-04 12:49:41 +0400 | [diff] [blame] | 385 | struct net *net = &init_net; |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 386 | |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 387 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
| 388 | |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 389 | if (nfsd_serv == NULL || n <= 0) |
| 390 | return 0; |
| 391 | |
| 392 | if (n > nfsd_serv->sv_nrpools) |
| 393 | n = nfsd_serv->sv_nrpools; |
| 394 | |
| 395 | /* enforce a global maximum number of threads */ |
| 396 | tot = 0; |
| 397 | for (i = 0; i < n; i++) { |
| 398 | if (nthreads[i] > NFSD_MAXSERVS) |
| 399 | nthreads[i] = NFSD_MAXSERVS; |
| 400 | tot += nthreads[i]; |
| 401 | } |
| 402 | if (tot > NFSD_MAXSERVS) { |
| 403 | /* total too large: scale down requested numbers */ |
| 404 | for (i = 0; i < n && tot > 0; i++) { |
| 405 | int new = nthreads[i] * NFSD_MAXSERVS / tot; |
| 406 | tot -= (nthreads[i] - new); |
| 407 | nthreads[i] = new; |
| 408 | } |
| 409 | for (i = 0; i < n && tot > 0; i++) { |
| 410 | nthreads[i]--; |
| 411 | tot--; |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * There must always be a thread in pool 0; the admin |
| 417 | * can't shut down NFS completely using pool_threads. |
| 418 | */ |
| 419 | if (nthreads[0] == 0) |
| 420 | nthreads[0] = 1; |
| 421 | |
| 422 | /* apply the new numbers */ |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 423 | svc_get(nfsd_serv); |
| 424 | for (i = 0; i < n; i++) { |
| 425 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], |
| 426 | nthreads[i]); |
| 427 | if (err) |
| 428 | break; |
| 429 | } |
Stanislav Kinsbursky | 786185b | 2012-05-04 12:49:41 +0400 | [diff] [blame] | 430 | |
| 431 | if (nfsd_serv->sv_nrthreads == 1) |
| 432 | svc_shutdown_net(nfsd_serv, net); |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 433 | svc_destroy(nfsd_serv); |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 434 | |
| 435 | return err; |
| 436 | } |
| 437 | |
Jeff Layton | ac77efb | 2010-07-20 14:10:22 -0400 | [diff] [blame] | 438 | /* |
| 439 | * Adjust the number of threads and return the new number of threads. |
| 440 | * This is also the function that starts the server if necessary, if |
| 441 | * this is the first time nrservs is nonzero. |
| 442 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | int |
| 444 | nfsd_svc(unsigned short port, int nrservs) |
| 445 | { |
| 446 | int error; |
J. Bruce Fields | 774f8bb | 2010-08-02 14:12:44 -0400 | [diff] [blame] | 447 | bool nfsd_up_before; |
Stanislav Kinsbursky | 786185b | 2012-05-04 12:49:41 +0400 | [diff] [blame] | 448 | struct net *net = &init_net; |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 449 | |
| 450 | mutex_lock(&nfsd_mutex); |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 451 | dprintk("nfsd: creating service\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | if (nrservs <= 0) |
| 453 | nrservs = 0; |
| 454 | if (nrservs > NFSD_MAXSERVS) |
| 455 | nrservs = NFSD_MAXSERVS; |
NeilBrown | 671e1fc | 2009-06-16 11:03:20 +1000 | [diff] [blame] | 456 | error = 0; |
| 457 | if (nrservs == 0 && nfsd_serv == NULL) |
| 458 | goto out; |
| 459 | |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 460 | error = nfsd_create_serv(); |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 461 | if (error) |
J. Bruce Fields | 774f8bb | 2010-08-02 14:12:44 -0400 | [diff] [blame] | 462 | goto out; |
| 463 | |
| 464 | nfsd_up_before = nfsd_up; |
| 465 | |
| 466 | error = nfsd_startup(port, nrservs); |
J. Bruce Fields | af4718f | 2010-07-21 18:31:42 -0400 | [diff] [blame] | 467 | if (error) |
| 468 | goto out_destroy; |
J. Bruce Fields | 774f8bb | 2010-08-02 14:12:44 -0400 | [diff] [blame] | 469 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
| 470 | if (error) |
| 471 | goto out_shutdown; |
J. Bruce Fields | af4718f | 2010-07-21 18:31:42 -0400 | [diff] [blame] | 472 | /* We are holding a reference to nfsd_serv which |
| 473 | * we don't want to count in the return value, |
| 474 | * so subtract 1 |
| 475 | */ |
| 476 | error = nfsd_serv->sv_nrthreads - 1; |
J. Bruce Fields | 774f8bb | 2010-08-02 14:12:44 -0400 | [diff] [blame] | 477 | out_shutdown: |
| 478 | if (error < 0 && !nfsd_up_before) |
| 479 | nfsd_shutdown(); |
Jeff Layton | 4ad9a34 | 2010-07-19 16:50:04 -0400 | [diff] [blame] | 480 | out_destroy: |
Stanislav Kinsbursky | 786185b | 2012-05-04 12:49:41 +0400 | [diff] [blame] | 481 | if (nfsd_serv->sv_nrthreads == 1) |
| 482 | svc_shutdown_net(nfsd_serv, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | svc_destroy(nfsd_serv); /* Release server */ |
Jeff Layton | 4ad9a34 | 2010-07-19 16:50:04 -0400 | [diff] [blame] | 484 | out: |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 485 | mutex_unlock(&nfsd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | return error; |
| 487 | } |
| 488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /* |
| 491 | * This is the NFS server kernel thread |
| 492 | */ |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 493 | static int |
| 494 | nfsd(void *vrqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | { |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 496 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 497 | int err, preverr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | /* Lock module and set up kernel thread */ |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 500 | mutex_lock(&nfsd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 502 | /* At this point, the thread shares current->fs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | * with the init process. We need to create files with a |
| 504 | * umask of 0 instead of init's umask. */ |
Al Viro | 3e93cd6 | 2009-03-29 19:00:13 -0400 | [diff] [blame] | 505 | if (unshare_fs_struct() < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | printk("Unable to start nfsd thread: out of memory\n"); |
| 507 | goto out; |
| 508 | } |
Al Viro | 3e93cd6 | 2009-03-29 19:00:13 -0400 | [diff] [blame] | 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | current->fs->umask = 0; |
| 511 | |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 512 | /* |
| 513 | * thread is spawned with all signals set to SIG_IGN, re-enable |
Jeff Layton | 100766f | 2008-06-30 14:09:46 -0400 | [diff] [blame] | 514 | * the ones that will bring down the thread |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 515 | */ |
Jeff Layton | 100766f | 2008-06-30 14:09:46 -0400 | [diff] [blame] | 516 | allow_signal(SIGKILL); |
| 517 | allow_signal(SIGHUP); |
| 518 | allow_signal(SIGINT); |
| 519 | allow_signal(SIGQUIT); |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | nfsdstats.th_cnt++; |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 522 | mutex_unlock(&nfsd_mutex); |
| 523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | /* |
| 525 | * We want less throttling in balance_dirty_pages() so that nfs to |
| 526 | * localhost doesn't cause nfsd to lock up due to all the client's |
| 527 | * dirty pages. |
| 528 | */ |
| 529 | current->flags |= PF_LESS_THROTTLE; |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 530 | set_freezable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
| 532 | /* |
| 533 | * The main request loop |
| 534 | */ |
| 535 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | /* |
| 537 | * Find a socket with data available and call its |
| 538 | * recvfrom routine. |
| 539 | */ |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 540 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | ; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 542 | if (err == -EINTR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | break; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 544 | else if (err < 0) { |
| 545 | if (err != preverr) { |
| 546 | printk(KERN_WARNING "%s: unexpected error " |
| 547 | "from svc_recv (%d)\n", __func__, -err); |
| 548 | preverr = err; |
| 549 | } |
| 550 | schedule_timeout_uninterruptible(HZ); |
| 551 | continue; |
| 552 | } |
| 553 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 554 | validate_process_creds(); |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 555 | svc_process(rqstp); |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 556 | validate_process_creds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
| 558 | |
NeilBrown | 24e3666 | 2006-10-02 02:17:45 -0700 | [diff] [blame] | 559 | /* Clear signals before calling svc_exit_thread() */ |
NeilBrown | 9e416052 | 2005-04-16 15:26:37 -0700 | [diff] [blame] | 560 | flush_signals(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 562 | mutex_lock(&nfsd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | nfsdstats.th_cnt --; |
| 564 | |
| 565 | out: |
Stanislav Kinsbursky | 786185b | 2012-05-04 12:49:41 +0400 | [diff] [blame] | 566 | if (rqstp->rq_server->sv_nrthreads == 1) |
| 567 | svc_shutdown_net(rqstp->rq_server, &init_net); |
| 568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | /* Release the thread */ |
| 570 | svc_exit_thread(rqstp); |
| 571 | |
| 572 | /* Release module */ |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 573 | mutex_unlock(&nfsd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | module_put_and_exit(0); |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 575 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | } |
| 577 | |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 578 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
| 579 | { |
| 580 | if (nfserr == nfserr_jukebox && vers == 2) |
| 581 | return nfserr_dropit; |
| 582 | if (nfserr == nfserr_wrongsec && vers < 4) |
| 583 | return nfserr_acces; |
| 584 | return nfserr; |
| 585 | } |
| 586 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | int |
Al Viro | c7afef1 | 2006-10-19 23:29:02 -0700 | [diff] [blame] | 588 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
| 590 | struct svc_procedure *proc; |
| 591 | kxdrproc_t xdr; |
Al Viro | ad451d3 | 2006-10-19 23:28:55 -0700 | [diff] [blame] | 592 | __be32 nfserr; |
| 593 | __be32 *nfserrp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
| 595 | dprintk("nfsd_dispatch: vers %d proc %d\n", |
| 596 | rqstp->rq_vers, rqstp->rq_proc); |
| 597 | proc = rqstp->rq_procinfo; |
| 598 | |
J. Bruce Fields | 1091006 | 2011-01-24 12:11:02 -0500 | [diff] [blame] | 599 | /* |
| 600 | * Give the xdr decoder a chance to change this if it wants |
| 601 | * (necessary in the NFSv4.0 compound case) |
| 602 | */ |
| 603 | rqstp->rq_cachetype = proc->pc_cachetype; |
| 604 | /* Decode arguments */ |
| 605 | xdr = proc->pc_decode; |
| 606 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
| 607 | rqstp->rq_argp)) { |
| 608 | dprintk("nfsd: failed to decode arguments!\n"); |
| 609 | *statp = rpc_garbage_args; |
| 610 | return 1; |
| 611 | } |
| 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | /* Check whether we have this call in the cache. */ |
J. Bruce Fields | 1091006 | 2011-01-24 12:11:02 -0500 | [diff] [blame] | 614 | switch (nfsd_cache_lookup(rqstp)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | case RC_INTR: |
| 616 | case RC_DROPIT: |
| 617 | return 0; |
| 618 | case RC_REPLY: |
| 619 | return 1; |
| 620 | case RC_DOIT:; |
| 621 | /* do it */ |
| 622 | } |
| 623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | /* need to grab the location to store the status, as |
| 625 | * nfsv4 does some encoding while processing |
| 626 | */ |
| 627 | nfserrp = rqstp->rq_res.head[0].iov_base |
| 628 | + rqstp->rq_res.head[0].iov_len; |
Al Viro | ad451d3 | 2006-10-19 23:28:55 -0700 | [diff] [blame] | 629 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
| 631 | /* Now call the procedure handler, and encode NFS status. */ |
| 632 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 633 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
J. Bruce Fields | 9e701c6 | 2011-01-02 21:56:36 -0500 | [diff] [blame] | 634 | if (nfserr == nfserr_dropit || rqstp->rq_dropme) { |
J. Bruce Fields | 45457e0 | 2007-06-22 17:26:32 -0400 | [diff] [blame] | 635 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | if (rqstp->rq_proc != 0) |
| 641 | *nfserrp++ = nfserr; |
| 642 | |
| 643 | /* Encode result. |
| 644 | * For NFSv2, additional info is never returned in case of an error. |
| 645 | */ |
| 646 | if (!(nfserr && rqstp->rq_vers == 2)) { |
| 647 | xdr = proc->pc_encode; |
| 648 | if (xdr && !xdr(rqstp, nfserrp, |
| 649 | rqstp->rq_resp)) { |
| 650 | /* Failed to encode result. Release cache entry */ |
| 651 | dprintk("nfsd: failed to encode result!\n"); |
| 652 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
| 653 | *statp = rpc_system_err; |
| 654 | return 1; |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | /* Store reply in cache. */ |
| 659 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); |
| 660 | return 1; |
| 661 | } |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 662 | |
| 663 | int nfsd_pool_stats_open(struct inode *inode, struct file *file) |
| 664 | { |
Ryusei Yamaguchi | ed2d8ae | 2009-08-16 00:54:41 +0900 | [diff] [blame] | 665 | int ret; |
| 666 | mutex_lock(&nfsd_mutex); |
| 667 | if (nfsd_serv == NULL) { |
| 668 | mutex_unlock(&nfsd_mutex); |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 669 | return -ENODEV; |
Ryusei Yamaguchi | ed2d8ae | 2009-08-16 00:54:41 +0900 | [diff] [blame] | 670 | } |
| 671 | /* bump up the psudo refcount while traversing */ |
| 672 | svc_get(nfsd_serv); |
| 673 | ret = svc_pool_stats_open(nfsd_serv, file); |
| 674 | mutex_unlock(&nfsd_mutex); |
| 675 | return ret; |
| 676 | } |
| 677 | |
| 678 | int nfsd_pool_stats_release(struct inode *inode, struct file *file) |
| 679 | { |
| 680 | int ret = seq_release(inode, file); |
Stanislav Kinsbursky | 786185b | 2012-05-04 12:49:41 +0400 | [diff] [blame] | 681 | struct net *net = &init_net; |
| 682 | |
Ryusei Yamaguchi | ed2d8ae | 2009-08-16 00:54:41 +0900 | [diff] [blame] | 683 | mutex_lock(&nfsd_mutex); |
| 684 | /* this function really, really should have been called svc_put() */ |
Stanislav Kinsbursky | 786185b | 2012-05-04 12:49:41 +0400 | [diff] [blame] | 685 | if (nfsd_serv->sv_nrthreads == 1) |
| 686 | svc_shutdown_net(nfsd_serv, net); |
Ryusei Yamaguchi | ed2d8ae | 2009-08-16 00:54:41 +0900 | [diff] [blame] | 687 | svc_destroy(nfsd_serv); |
| 688 | mutex_unlock(&nfsd_mutex); |
| 689 | return ret; |
Greg Banks | 03cf6c9 | 2009-01-13 21:26:36 +1100 | [diff] [blame] | 690 | } |