Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfsd/nfssvc.c |
| 3 | * |
| 4 | * Central processing for nfsd. |
| 5 | * |
| 6 | * Authors: Olaf Kirch (okir@monad.swb.de) |
| 7 | * |
| 8 | * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> |
| 9 | */ |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/module.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 12 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/time.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/nfs.h> |
| 16 | #include <linux/in.h> |
| 17 | #include <linux/uio.h> |
| 18 | #include <linux/unistd.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/smp.h> |
| 21 | #include <linux/smp_lock.h> |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 22 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/fs_struct.h> |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 24 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include <linux/sunrpc/types.h> |
| 27 | #include <linux/sunrpc/stats.h> |
| 28 | #include <linux/sunrpc/svc.h> |
| 29 | #include <linux/sunrpc/svcsock.h> |
| 30 | #include <linux/sunrpc/cache.h> |
| 31 | #include <linux/nfsd/nfsd.h> |
| 32 | #include <linux/nfsd/stats.h> |
| 33 | #include <linux/nfsd/cache.h> |
NeilBrown | 70c3b76 | 2005-11-07 01:00:25 -0800 | [diff] [blame] | 34 | #include <linux/nfsd/syscall.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/lockd/bind.h> |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 36 | #include <linux/nfsacl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #define NFSDDBG_FACILITY NFSDDBG_SVC |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | extern struct svc_program nfsd_program; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 41 | static int nfsd(void *vrqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | struct timeval nfssvc_boot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | static atomic_t nfsd_busy; |
| 44 | static unsigned long nfsd_last_call; |
| 45 | static DEFINE_SPINLOCK(nfsd_call_lock); |
| 46 | |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 47 | /* |
| 48 | * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members |
| 49 | * of the svc_serv struct. In particular, ->sv_nrthreads but also to some |
| 50 | * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt |
| 51 | * |
| 52 | * If (out side the lock) nfsd_serv is non-NULL, then it must point to a |
| 53 | * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number |
| 54 | * of nfsd threads must exist and each must listed in ->sp_all_threads in each |
| 55 | * entry of ->sv_pools[]. |
| 56 | * |
| 57 | * Transitions of the thread count between zero and non-zero are of particular |
| 58 | * interest since the svc_serv needs to be created and initialized at that |
| 59 | * point, or freed. |
Jeff Layton | 3dd98a3 | 2008-06-10 08:40:36 -0400 | [diff] [blame] | 60 | * |
| 61 | * Finally, the nfsd_mutex also protects some of the global variables that are |
| 62 | * accessed when nfsd starts and that are settable via the write_* routines in |
| 63 | * nfsctl.c. In particular: |
| 64 | * |
| 65 | * user_recovery_dirname |
| 66 | * user_lease_time |
| 67 | * nfsd_versions |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 68 | */ |
| 69 | DEFINE_MUTEX(nfsd_mutex); |
| 70 | struct svc_serv *nfsd_serv; |
| 71 | |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 72 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 73 | static struct svc_stat nfsd_acl_svcstats; |
| 74 | static struct svc_version * nfsd_acl_version[] = { |
| 75 | [2] = &nfsd_acl_version2, |
| 76 | [3] = &nfsd_acl_version3, |
| 77 | }; |
| 78 | |
| 79 | #define NFSD_ACL_MINVERS 2 |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 80 | #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 81 | static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; |
| 82 | |
| 83 | static struct svc_program nfsd_acl_program = { |
| 84 | .pg_prog = NFS_ACL_PROGRAM, |
| 85 | .pg_nvers = NFSD_ACL_NRVERS, |
| 86 | .pg_vers = nfsd_acl_versions, |
NeilBrown | 1a8eff6 | 2007-01-26 00:56:58 -0800 | [diff] [blame] | 87 | .pg_name = "nfsacl", |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 88 | .pg_class = "nfsd", |
| 89 | .pg_stats = &nfsd_acl_svcstats, |
| 90 | .pg_authenticate = &svc_set_client, |
| 91 | }; |
| 92 | |
| 93 | static struct svc_stat nfsd_acl_svcstats = { |
| 94 | .program = &nfsd_acl_program, |
| 95 | }; |
| 96 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |
| 97 | |
NeilBrown | 70c3b76 | 2005-11-07 01:00:25 -0800 | [diff] [blame] | 98 | static struct svc_version * nfsd_version[] = { |
| 99 | [2] = &nfsd_version2, |
| 100 | #if defined(CONFIG_NFSD_V3) |
| 101 | [3] = &nfsd_version3, |
| 102 | #endif |
| 103 | #if defined(CONFIG_NFSD_V4) |
| 104 | [4] = &nfsd_version4, |
| 105 | #endif |
| 106 | }; |
| 107 | |
| 108 | #define NFSD_MINVERS 2 |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 109 | #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) |
NeilBrown | 70c3b76 | 2005-11-07 01:00:25 -0800 | [diff] [blame] | 110 | static struct svc_version *nfsd_versions[NFSD_NRVERS]; |
| 111 | |
| 112 | struct svc_program nfsd_program = { |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 113 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 114 | .pg_next = &nfsd_acl_program, |
| 115 | #endif |
NeilBrown | 70c3b76 | 2005-11-07 01:00:25 -0800 | [diff] [blame] | 116 | .pg_prog = NFS_PROGRAM, /* program number */ |
| 117 | .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ |
| 118 | .pg_vers = nfsd_versions, /* version table */ |
| 119 | .pg_name = "nfsd", /* program name */ |
| 120 | .pg_class = "nfsd", /* authentication class */ |
| 121 | .pg_stats = &nfsd_svcstats, /* version table */ |
| 122 | .pg_authenticate = &svc_set_client, /* export authentication */ |
| 123 | |
| 124 | }; |
| 125 | |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 126 | int nfsd_vers(int vers, enum vers_op change) |
| 127 | { |
| 128 | if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) |
| 129 | return -1; |
| 130 | switch(change) { |
| 131 | case NFSD_SET: |
| 132 | nfsd_versions[vers] = nfsd_version[vers]; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 133 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 134 | if (vers < NFSD_ACL_NRVERS) |
NeilBrown | 1a8eff6 | 2007-01-26 00:56:58 -0800 | [diff] [blame] | 135 | nfsd_acl_versions[vers] = nfsd_acl_version[vers]; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 136 | #endif |
NeilBrown | 1a8eff6 | 2007-01-26 00:56:58 -0800 | [diff] [blame] | 137 | break; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 138 | case NFSD_CLEAR: |
| 139 | nfsd_versions[vers] = NULL; |
| 140 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 141 | if (vers < NFSD_ACL_NRVERS) |
NeilBrown | 1a8eff6 | 2007-01-26 00:56:58 -0800 | [diff] [blame] | 142 | nfsd_acl_versions[vers] = NULL; |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 143 | #endif |
| 144 | break; |
| 145 | case NFSD_TEST: |
| 146 | return nfsd_versions[vers] != NULL; |
| 147 | case NFSD_AVAIL: |
| 148 | return nfsd_version[vers] != NULL; |
| 149 | } |
| 150 | return 0; |
| 151 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | /* |
| 153 | * Maximum number of nfsd processes |
| 154 | */ |
| 155 | #define NFSD_MAXSERVS 8192 |
| 156 | |
| 157 | int nfsd_nrthreads(void) |
| 158 | { |
Neil Brown | c7d106c | 2008-06-12 13:38:42 +1000 | [diff] [blame] | 159 | int rv = 0; |
| 160 | mutex_lock(&nfsd_mutex); |
| 161 | if (nfsd_serv) |
| 162 | rv = nfsd_serv->sv_nrthreads; |
| 163 | mutex_unlock(&nfsd_mutex); |
| 164 | return rv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } |
| 166 | |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 167 | static void nfsd_last_thread(struct svc_serv *serv) |
| 168 | { |
| 169 | /* When last nfsd thread exits we need to do some clean-up */ |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 170 | struct svc_xprt *xprt; |
| 171 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) |
NeilBrown | 24e3666 | 2006-10-02 02:17:45 -0700 | [diff] [blame] | 172 | lockd_down(); |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 173 | nfsd_serv = NULL; |
| 174 | nfsd_racache_shutdown(); |
| 175 | nfs4_state_shutdown(); |
| 176 | |
Jeff Layton | e096bbc | 2008-06-10 08:40:37 -0400 | [diff] [blame] | 177 | printk(KERN_WARNING "nfsd: last server has exited, flushing export " |
| 178 | "cache\n"); |
| 179 | nfsd_export_flush(); |
NeilBrown | bc591cc | 2006-10-02 02:17:44 -0700 | [diff] [blame] | 180 | } |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 181 | |
| 182 | void nfsd_reset_versions(void) |
| 183 | { |
| 184 | int found_one = 0; |
| 185 | int i; |
| 186 | |
| 187 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { |
| 188 | if (nfsd_program.pg_vers[i]) |
| 189 | found_one = 1; |
| 190 | } |
| 191 | |
| 192 | if (!found_one) { |
| 193 | for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) |
| 194 | nfsd_program.pg_vers[i] = nfsd_version[i]; |
| 195 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 196 | for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) |
| 197 | nfsd_acl_program.pg_vers[i] = |
| 198 | nfsd_acl_version[i]; |
| 199 | #endif |
| 200 | } |
| 201 | } |
| 202 | |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 203 | |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 204 | int nfsd_create_serv(void) |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 205 | { |
| 206 | int err = 0; |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 207 | |
| 208 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 209 | if (nfsd_serv) { |
Greg Banks | 9a24ab5 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 210 | svc_get(nfsd_serv); |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 211 | return 0; |
| 212 | } |
NeilBrown | 596bbe5 | 2006-10-04 02:15:48 -0700 | [diff] [blame] | 213 | if (nfsd_max_blksize == 0) { |
| 214 | /* choose a suitable default */ |
| 215 | struct sysinfo i; |
| 216 | si_meminfo(&i); |
| 217 | /* Aim for 1/4096 of memory per thread |
| 218 | * This gives 1MB on 4Gig machines |
| 219 | * But only uses 32K on 128M machines. |
| 220 | * Bottom out at 8K on 32M and smaller. |
| 221 | * Of course, this is only a default. |
| 222 | */ |
| 223 | nfsd_max_blksize = NFSSVC_MAXBLKSIZE; |
NeilBrown | 44c5560 | 2006-10-04 02:16:15 -0700 | [diff] [blame] | 224 | i.totalram <<= PAGE_SHIFT - 12; |
NeilBrown | 596bbe5 | 2006-10-04 02:15:48 -0700 | [diff] [blame] | 225 | while (nfsd_max_blksize > i.totalram && |
| 226 | nfsd_max_blksize >= 8*1024*2) |
| 227 | nfsd_max_blksize /= 2; |
| 228 | } |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 229 | |
| 230 | atomic_set(&nfsd_busy, 0); |
Jeff Layton | e096bbc | 2008-06-10 08:40:37 -0400 | [diff] [blame] | 231 | nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, |
Chuck Lever | e851db5 | 2008-06-30 18:45:30 -0400 | [diff] [blame^] | 232 | AF_INET, |
Jeff Layton | a75c5d0 | 2008-06-10 08:40:39 -0400 | [diff] [blame] | 233 | nfsd_last_thread, nfsd, THIS_MODULE); |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 234 | if (nfsd_serv == NULL) |
| 235 | err = -ENOMEM; |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 236 | |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 237 | do_gettimeofday(&nfssvc_boot); /* record boot time */ |
| 238 | return err; |
| 239 | } |
| 240 | |
| 241 | static int nfsd_init_socks(int port) |
| 242 | { |
| 243 | int error; |
| 244 | if (!list_empty(&nfsd_serv->sv_permsocks)) |
| 245 | return 0; |
| 246 | |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 247 | error = lockd_up(IPPROTO_UDP); |
NeilBrown | 4a3ae42 | 2006-10-02 02:17:53 -0700 | [diff] [blame] | 248 | if (error >= 0) { |
Tom Tucker | d7c9f1e | 2007-12-30 21:07:44 -0600 | [diff] [blame] | 249 | error = svc_create_xprt(nfsd_serv, "udp", port, |
Chuck Lever | 482fb94 | 2007-02-12 00:53:29 -0800 | [diff] [blame] | 250 | SVC_SOCK_DEFAULTS); |
NeilBrown | 4a3ae42 | 2006-10-02 02:17:53 -0700 | [diff] [blame] | 251 | if (error < 0) |
| 252 | lockd_down(); |
| 253 | } |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 254 | if (error < 0) |
| 255 | return error; |
| 256 | |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 257 | error = lockd_up(IPPROTO_TCP); |
NeilBrown | 4a3ae42 | 2006-10-02 02:17:53 -0700 | [diff] [blame] | 258 | if (error >= 0) { |
Tom Tucker | d7c9f1e | 2007-12-30 21:07:44 -0600 | [diff] [blame] | 259 | error = svc_create_xprt(nfsd_serv, "tcp", port, |
Chuck Lever | 482fb94 | 2007-02-12 00:53:29 -0800 | [diff] [blame] | 260 | SVC_SOCK_DEFAULTS); |
NeilBrown | 4a3ae42 | 2006-10-02 02:17:53 -0700 | [diff] [blame] | 261 | if (error < 0) |
| 262 | lockd_down(); |
| 263 | } |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 264 | if (error < 0) |
| 265 | return error; |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 266 | return 0; |
| 267 | } |
| 268 | |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 269 | int nfsd_nrpools(void) |
| 270 | { |
| 271 | if (nfsd_serv == NULL) |
| 272 | return 0; |
| 273 | else |
| 274 | return nfsd_serv->sv_nrpools; |
| 275 | } |
| 276 | |
| 277 | int nfsd_get_nrthreads(int n, int *nthreads) |
| 278 | { |
| 279 | int i = 0; |
| 280 | |
| 281 | if (nfsd_serv != NULL) { |
| 282 | for (i = 0; i < nfsd_serv->sv_nrpools && i < n; i++) |
| 283 | nthreads[i] = nfsd_serv->sv_pools[i].sp_nrthreads; |
| 284 | } |
| 285 | |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | int nfsd_set_nrthreads(int n, int *nthreads) |
| 290 | { |
| 291 | int i = 0; |
| 292 | int tot = 0; |
| 293 | int err = 0; |
| 294 | |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 295 | WARN_ON(!mutex_is_locked(&nfsd_mutex)); |
| 296 | |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 297 | if (nfsd_serv == NULL || n <= 0) |
| 298 | return 0; |
| 299 | |
| 300 | if (n > nfsd_serv->sv_nrpools) |
| 301 | n = nfsd_serv->sv_nrpools; |
| 302 | |
| 303 | /* enforce a global maximum number of threads */ |
| 304 | tot = 0; |
| 305 | for (i = 0; i < n; i++) { |
| 306 | if (nthreads[i] > NFSD_MAXSERVS) |
| 307 | nthreads[i] = NFSD_MAXSERVS; |
| 308 | tot += nthreads[i]; |
| 309 | } |
| 310 | if (tot > NFSD_MAXSERVS) { |
| 311 | /* total too large: scale down requested numbers */ |
| 312 | for (i = 0; i < n && tot > 0; i++) { |
| 313 | int new = nthreads[i] * NFSD_MAXSERVS / tot; |
| 314 | tot -= (nthreads[i] - new); |
| 315 | nthreads[i] = new; |
| 316 | } |
| 317 | for (i = 0; i < n && tot > 0; i++) { |
| 318 | nthreads[i]--; |
| 319 | tot--; |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * There must always be a thread in pool 0; the admin |
| 325 | * can't shut down NFS completely using pool_threads. |
| 326 | */ |
| 327 | if (nthreads[0] == 0) |
| 328 | nthreads[0] = 1; |
| 329 | |
| 330 | /* apply the new numbers */ |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 331 | svc_get(nfsd_serv); |
| 332 | for (i = 0; i < n; i++) { |
| 333 | err = svc_set_num_threads(nfsd_serv, &nfsd_serv->sv_pools[i], |
| 334 | nthreads[i]); |
| 335 | if (err) |
| 336 | break; |
| 337 | } |
| 338 | svc_destroy(nfsd_serv); |
Greg Banks | eed2965 | 2006-10-02 02:18:02 -0700 | [diff] [blame] | 339 | |
| 340 | return err; |
| 341 | } |
| 342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | int |
| 344 | nfsd_svc(unsigned short port, int nrservs) |
| 345 | { |
| 346 | int error; |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 347 | |
| 348 | mutex_lock(&nfsd_mutex); |
NeilBrown | 6658d3a | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 349 | dprintk("nfsd: creating service\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | error = -EINVAL; |
| 351 | if (nrservs <= 0) |
| 352 | nrservs = 0; |
| 353 | if (nrservs > NFSD_MAXSERVS) |
| 354 | nrservs = NFSD_MAXSERVS; |
| 355 | |
| 356 | /* Readahead param cache - will no-op if it already exists */ |
| 357 | error = nfsd_racache_init(2*nrservs); |
| 358 | if (error<0) |
| 359 | goto out; |
J. Bruce Fields | e8ff2a8 | 2007-08-01 15:30:59 -0400 | [diff] [blame] | 360 | nfs4_state_start(); |
Andreas Gruenbacher | 3fb803a | 2006-02-01 03:04:34 -0800 | [diff] [blame] | 361 | |
NeilBrown | 02a375f | 2006-10-02 02:17:46 -0700 | [diff] [blame] | 362 | nfsd_reset_versions(); |
| 363 | |
| 364 | error = nfsd_create_serv(); |
| 365 | |
| 366 | if (error) |
| 367 | goto out; |
| 368 | error = nfsd_init_socks(port); |
| 369 | if (error) |
| 370 | goto failure; |
| 371 | |
Greg Banks | eec0966 | 2006-10-02 02:18:00 -0700 | [diff] [blame] | 372 | error = svc_set_num_threads(nfsd_serv, NULL, nrservs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | failure: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | svc_destroy(nfsd_serv); /* Release server */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | out: |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 376 | mutex_unlock(&nfsd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | return error; |
| 378 | } |
| 379 | |
| 380 | static inline void |
| 381 | update_thread_usage(int busy_threads) |
| 382 | { |
| 383 | unsigned long prev_call; |
| 384 | unsigned long diff; |
| 385 | int decile; |
| 386 | |
| 387 | spin_lock(&nfsd_call_lock); |
| 388 | prev_call = nfsd_last_call; |
| 389 | nfsd_last_call = jiffies; |
| 390 | decile = busy_threads*10/nfsdstats.th_cnt; |
| 391 | if (decile>0 && decile <= 10) { |
| 392 | diff = nfsd_last_call - prev_call; |
| 393 | if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) |
| 394 | nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; |
| 395 | if (decile == 10) |
| 396 | nfsdstats.th_fullcnt++; |
| 397 | } |
| 398 | spin_unlock(&nfsd_call_lock); |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * This is the NFS server kernel thread |
| 403 | */ |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 404 | static int |
| 405 | nfsd(void *vrqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | { |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 407 | struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | struct fs_struct *fsp; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 409 | int err, preverr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | /* Lock module and set up kernel thread */ |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 412 | mutex_lock(&nfsd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 414 | /* At this point, the thread shares current->fs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | * with the init process. We need to create files with a |
| 416 | * umask of 0 instead of init's umask. */ |
| 417 | fsp = copy_fs_struct(current->fs); |
| 418 | if (!fsp) { |
| 419 | printk("Unable to start nfsd thread: out of memory\n"); |
| 420 | goto out; |
| 421 | } |
| 422 | exit_fs(current); |
| 423 | current->fs = fsp; |
| 424 | current->fs->umask = 0; |
| 425 | |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 426 | /* |
| 427 | * thread is spawned with all signals set to SIG_IGN, re-enable |
Jeff Layton | 100766f | 2008-06-30 14:09:46 -0400 | [diff] [blame] | 428 | * the ones that will bring down the thread |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 429 | */ |
Jeff Layton | 100766f | 2008-06-30 14:09:46 -0400 | [diff] [blame] | 430 | allow_signal(SIGKILL); |
| 431 | allow_signal(SIGHUP); |
| 432 | allow_signal(SIGINT); |
| 433 | allow_signal(SIGQUIT); |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | nfsdstats.th_cnt++; |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 436 | mutex_unlock(&nfsd_mutex); |
| 437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | /* |
| 439 | * We want less throttling in balance_dirty_pages() so that nfs to |
| 440 | * localhost doesn't cause nfsd to lock up due to all the client's |
| 441 | * dirty pages. |
| 442 | */ |
| 443 | current->flags |= PF_LESS_THROTTLE; |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 444 | set_freezable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | /* |
| 447 | * The main request loop |
| 448 | */ |
| 449 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | /* |
| 451 | * Find a socket with data available and call its |
| 452 | * recvfrom routine. |
| 453 | */ |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 454 | while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | ; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 456 | if (err == -EINTR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | break; |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 458 | else if (err < 0) { |
| 459 | if (err != preverr) { |
| 460 | printk(KERN_WARNING "%s: unexpected error " |
| 461 | "from svc_recv (%d)\n", __func__, -err); |
| 462 | preverr = err; |
| 463 | } |
| 464 | schedule_timeout_uninterruptible(HZ); |
| 465 | continue; |
| 466 | } |
| 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | update_thread_usage(atomic_read(&nfsd_busy)); |
| 469 | atomic_inc(&nfsd_busy); |
| 470 | |
| 471 | /* Lock the export hash tables for reading. */ |
| 472 | exp_readlock(); |
| 473 | |
NeilBrown | 6fb2b47 | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 474 | svc_process(rqstp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | /* Unlock export hash tables */ |
| 477 | exp_readunlock(); |
| 478 | update_thread_usage(atomic_read(&nfsd_busy)); |
| 479 | atomic_dec(&nfsd_busy); |
| 480 | } |
| 481 | |
NeilBrown | 24e3666 | 2006-10-02 02:17:45 -0700 | [diff] [blame] | 482 | /* Clear signals before calling svc_exit_thread() */ |
NeilBrown | 9e416052 | 2005-04-16 15:26:37 -0700 | [diff] [blame] | 483 | flush_signals(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 485 | mutex_lock(&nfsd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | nfsdstats.th_cnt --; |
| 487 | |
| 488 | out: |
| 489 | /* Release the thread */ |
| 490 | svc_exit_thread(rqstp); |
| 491 | |
| 492 | /* Release module */ |
Neil Brown | bedbdd8 | 2008-06-10 08:40:35 -0400 | [diff] [blame] | 493 | mutex_unlock(&nfsd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | module_put_and_exit(0); |
Jeff Layton | 9867d76 | 2008-06-10 08:40:38 -0400 | [diff] [blame] | 495 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | } |
| 497 | |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 498 | static __be32 map_new_errors(u32 vers, __be32 nfserr) |
| 499 | { |
| 500 | if (nfserr == nfserr_jukebox && vers == 2) |
| 501 | return nfserr_dropit; |
| 502 | if (nfserr == nfserr_wrongsec && vers < 4) |
| 503 | return nfserr_acces; |
| 504 | return nfserr; |
| 505 | } |
| 506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | int |
Al Viro | c7afef1 | 2006-10-19 23:29:02 -0700 | [diff] [blame] | 508 | nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | { |
| 510 | struct svc_procedure *proc; |
| 511 | kxdrproc_t xdr; |
Al Viro | ad451d3 | 2006-10-19 23:28:55 -0700 | [diff] [blame] | 512 | __be32 nfserr; |
| 513 | __be32 *nfserrp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
| 515 | dprintk("nfsd_dispatch: vers %d proc %d\n", |
| 516 | rqstp->rq_vers, rqstp->rq_proc); |
| 517 | proc = rqstp->rq_procinfo; |
| 518 | |
| 519 | /* Check whether we have this call in the cache. */ |
| 520 | switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) { |
| 521 | case RC_INTR: |
| 522 | case RC_DROPIT: |
| 523 | return 0; |
| 524 | case RC_REPLY: |
| 525 | return 1; |
| 526 | case RC_DOIT:; |
| 527 | /* do it */ |
| 528 | } |
| 529 | |
| 530 | /* Decode arguments */ |
| 531 | xdr = proc->pc_decode; |
Al Viro | ad451d3 | 2006-10-19 23:28:55 -0700 | [diff] [blame] | 532 | if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | rqstp->rq_argp)) { |
| 534 | dprintk("nfsd: failed to decode arguments!\n"); |
| 535 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
| 536 | *statp = rpc_garbage_args; |
| 537 | return 1; |
| 538 | } |
| 539 | |
| 540 | /* need to grab the location to store the status, as |
| 541 | * nfsv4 does some encoding while processing |
| 542 | */ |
| 543 | nfserrp = rqstp->rq_res.head[0].iov_base |
| 544 | + rqstp->rq_res.head[0].iov_len; |
Al Viro | ad451d3 | 2006-10-19 23:28:55 -0700 | [diff] [blame] | 545 | rqstp->rq_res.head[0].iov_len += sizeof(__be32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
| 547 | /* Now call the procedure handler, and encode NFS status. */ |
| 548 | nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 549 | nfserr = map_new_errors(rqstp->rq_vers, nfserr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | if (nfserr == nfserr_dropit) { |
J. Bruce Fields | 45457e0 | 2007-06-22 17:26:32 -0400 | [diff] [blame] | 551 | dprintk("nfsd: Dropping request; may be revisited later\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | if (rqstp->rq_proc != 0) |
| 557 | *nfserrp++ = nfserr; |
| 558 | |
| 559 | /* Encode result. |
| 560 | * For NFSv2, additional info is never returned in case of an error. |
| 561 | */ |
| 562 | if (!(nfserr && rqstp->rq_vers == 2)) { |
| 563 | xdr = proc->pc_encode; |
| 564 | if (xdr && !xdr(rqstp, nfserrp, |
| 565 | rqstp->rq_resp)) { |
| 566 | /* Failed to encode result. Release cache entry */ |
| 567 | dprintk("nfsd: failed to encode result!\n"); |
| 568 | nfsd_cache_update(rqstp, RC_NOCACHE, NULL); |
| 569 | *statp = rpc_system_err; |
| 570 | return 1; |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | /* Store reply in cache. */ |
| 575 | nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); |
| 576 | return 1; |
| 577 | } |