libcfs/libcfs/linux/linux-prim.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LNET
  38 #ifndef AUTOCONF_INCLUDED
  39 #include <linux/config.h>
  40 #endif
  41 #include <linux/module.h>
  42 #include <linux/kernel.h>
  43 #include <linux/sched.h>
  44
  45 #include <libcfs/libcfs.h>
  46
  47 #if defined(CONFIG_KGDB)
  48 #include <asm/kgdb.h>
  49 #endif
  50
  51 #define LINUX_WAITQ(w) ((wait_queue_t *) w)
  52 #define LINUX_WAITQ_HEAD(w) ((wait_queue_head_t *) w)
  53
  54 void
  55 cfs_waitq_init(cfs_waitq_t *waitq)
  56 {
  57         init_waitqueue_head(LINUX_WAITQ_HEAD(waitq));
  58 }
  59 EXPORT_SYMBOL(cfs_waitq_init);
  60
  61 void
  62 cfs_waitlink_init(cfs_waitlink_t *link)
  63 {
  64         init_waitqueue_entry(LINUX_WAITQ(link), current);
  65 }
  66 EXPORT_SYMBOL(cfs_waitlink_init);
  67
  68 void
  69 cfs_waitq_add(cfs_waitq_t *waitq, cfs_waitlink_t *link)
  70 {
  71         add_wait_queue(LINUX_WAITQ_HEAD(waitq), LINUX_WAITQ(link));
  72 }
  73 EXPORT_SYMBOL(cfs_waitq_add);
  74
  75 void
  76 cfs_waitq_add_exclusive(cfs_waitq_t *waitq,
  77                              cfs_waitlink_t *link)
  78 {
  79         add_wait_queue_exclusive(LINUX_WAITQ_HEAD(waitq), LINUX_WAITQ(link));
  80 }
  81 EXPORT_SYMBOL(cfs_waitq_add_exclusive);
  82
  83 void
  84 cfs_waitq_del(cfs_waitq_t *waitq, cfs_waitlink_t *link)
  85 {
  86         remove_wait_queue(LINUX_WAITQ_HEAD(waitq), LINUX_WAITQ(link));
  87 }
  88 EXPORT_SYMBOL(cfs_waitq_del);
  89
  90 int
  91 cfs_waitq_active(cfs_waitq_t *waitq)
  92 {
  93         return waitqueue_active(LINUX_WAITQ_HEAD(waitq));
  94 }
  95 EXPORT_SYMBOL(cfs_waitq_active);
  96
  97 void
  98 cfs_waitq_signal(cfs_waitq_t *waitq)
  99 {
 100         wake_up(LINUX_WAITQ_HEAD(waitq));
 101 }
 102 EXPORT_SYMBOL(cfs_waitq_signal);
 103
 104 void
 105 cfs_waitq_signal_nr(cfs_waitq_t *waitq, int nr)
 106 {
 107         wake_up_nr(LINUX_WAITQ_HEAD(waitq), nr);
 108 }
 109 EXPORT_SYMBOL(cfs_waitq_signal_nr);
 110
 111 void
 112 cfs_waitq_broadcast(cfs_waitq_t *waitq)
 113 {
 114         wake_up_all(LINUX_WAITQ_HEAD(waitq));
 115 }
 116 EXPORT_SYMBOL(cfs_waitq_broadcast);
 117
 118 void
 119 cfs_waitq_wait(cfs_waitlink_t *link, cfs_task_state_t state)
 120 {
 121         schedule();
 122 }
 123 EXPORT_SYMBOL(cfs_waitq_wait);
 124
 125 int64_t
 126 cfs_waitq_timedwait(cfs_waitlink_t *link, cfs_task_state_t state, int64_t timeout)
 127 {
 128         return schedule_timeout(timeout);
 129 }
 130 EXPORT_SYMBOL(cfs_waitq_timedwait);
 131
 132 void
 133 cfs_schedule_timeout(cfs_task_state_t state, int64_t timeout)
 134 {
 135         set_current_state(state);
 136         schedule_timeout(timeout);
 137 }
 138 EXPORT_SYMBOL(cfs_schedule_timeout);
 139
 140 void
 141 cfs_schedule(void)
 142 {
 143         schedule();
 144 }
 145 EXPORT_SYMBOL(cfs_schedule);
 146
 147 /* deschedule for a bit... */
 148 void
 149 cfs_pause(cfs_duration_t ticks)
 150 {
 151         set_current_state(TASK_UNINTERRUPTIBLE);
 152         schedule_timeout(ticks);
 153 }
 154 EXPORT_SYMBOL(cfs_pause);
 155
 156 int cfs_need_resched(void)
 157 {
 158         return need_resched();
 159 }
 160 EXPORT_SYMBOL(cfs_need_resched);
 161
 162 void cfs_cond_resched(void)
 163 {
 164         cond_resched();
 165 }
 166 EXPORT_SYMBOL(cfs_cond_resched);
 167
 168 void cfs_init_timer(cfs_timer_t *t)
 169 {
 170         init_timer(t);
 171 }
 172 EXPORT_SYMBOL(cfs_init_timer);
 173
 174 void cfs_timer_init(cfs_timer_t *t, cfs_timer_func_t *func, void *arg)
 175 {
 176         init_timer(t);
 177         t->function = func;
 178         t->data = (unsigned long)arg;
 179 }
 180 EXPORT_SYMBOL(cfs_timer_init);
 181
 182 void cfs_timer_done(cfs_timer_t *t)
 183 {
 184         return;
 185 }
 186 EXPORT_SYMBOL(cfs_timer_done);
 187
 188 void cfs_timer_arm(cfs_timer_t *t, cfs_time_t deadline)
 189 {
 190         mod_timer(t, deadline);
 191 }
 192 EXPORT_SYMBOL(cfs_timer_arm);
 193
 194 void cfs_timer_disarm(cfs_timer_t *t)
 195 {
 196         del_timer(t);
 197 }
 198 EXPORT_SYMBOL(cfs_timer_disarm);
 199
 200 int  cfs_timer_is_armed(cfs_timer_t *t)
 201 {
 202         return timer_pending(t);
 203 }
 204 EXPORT_SYMBOL(cfs_timer_is_armed);
 205
 206 cfs_time_t cfs_timer_deadline(cfs_timer_t *t)
 207 {
 208         return t->expires;
 209 }
 210 EXPORT_SYMBOL(cfs_timer_deadline);
 211
 212 void cfs_enter_debugger(void)
 213 {
 214 #if defined(CONFIG_KGDB)
 215         BREAKPOINT();
 216 #elif defined(__arch_um__)
 217         asm("int $3");
 218 #else
 219         /* nothing */
 220 #endif
 221 }
 222
 223 void cfs_daemonize(char *str) {
 224         unsigned long flags;
 225
 226         lock_kernel();
 227         daemonize(str);
 228         SIGNAL_MASK_LOCK(current, flags);
 229         sigfillset(&current->blocked);
 230         RECALC_SIGPENDING;
 231         SIGNAL_MASK_UNLOCK(current, flags);
 232         unlock_kernel();
 233 }
 234
 235 int cfs_daemonize_ctxt(char *str) {
 236         struct task_struct *tsk = current;
 237         struct fs_struct *fs = NULL;
 238
 239         cfs_daemonize(str);
 240         fs = copy_fs_struct(tsk->fs);
 241         if (fs == NULL)
 242                 return -ENOMEM;
 243         exit_fs(tsk);
 244         tsk->fs = fs;
 245         return 0;
 246 }
 247
 248
 249 sigset_t
 250 cfs_get_blockedsigs(void)
 251 {
 252         unsigned long          flags;
 253         sigset_t        old;
 254
 255         SIGNAL_MASK_LOCK(current, flags);
 256         old = current->blocked;
 257         SIGNAL_MASK_UNLOCK(current, flags);
 258         return old;
 259 }
 260
 261 sigset_t
 262 cfs_block_allsigs(void)
 263 {
 264         unsigned long          flags;
 265         sigset_t        old;
 266
 267         SIGNAL_MASK_LOCK(current, flags);
 268         old = current->blocked;
 269         sigfillset(&current->blocked);
 270         RECALC_SIGPENDING;
 271         SIGNAL_MASK_UNLOCK(current, flags);
 272
 273         return old;
 274 }
 275
 276 sigset_t
 277 cfs_block_sigs(sigset_t bits)
 278 {
 279         unsigned long  flags;
 280         sigset_t        old;
 281
 282         SIGNAL_MASK_LOCK(current, flags);
 283         old = current->blocked;
 284         current->blocked = bits;
 285         RECALC_SIGPENDING;
 286         SIGNAL_MASK_UNLOCK(current, flags);
 287         return old;
 288 }
 289
 290 void
 291 cfs_restore_sigs (cfs_sigset_t old)
 292 {
 293         unsigned long  flags;
 294
 295         SIGNAL_MASK_LOCK(current, flags);
 296         current->blocked = old;
 297         RECALC_SIGPENDING;
 298         SIGNAL_MASK_UNLOCK(current, flags);
 299 }
 300
 301 int
 302 cfs_signal_pending(void)
 303 {
 304         return signal_pending(current);
 305 }
 306
 307 void
 308 cfs_clear_sigpending(void)
 309 {
 310         unsigned long flags;
 311
 312         SIGNAL_MASK_LOCK(current, flags);
 313         CLEAR_SIGPENDING;
 314         SIGNAL_MASK_UNLOCK(current, flags);
 315 }
 316
 317 int
 318 libcfs_arch_init(void)
 319 {
 320         return 0;
 321 }
 322
 323 void
 324 libcfs_arch_cleanup(void)
 325 {
 326         return;
 327 }
 328
 329 EXPORT_SYMBOL(libcfs_arch_init);
 330 EXPORT_SYMBOL(libcfs_arch_cleanup);
 331 EXPORT_SYMBOL(cfs_enter_debugger);
 332 EXPORT_SYMBOL(cfs_daemonize);
 333 EXPORT_SYMBOL(cfs_daemonize_ctxt);
 334 EXPORT_SYMBOL(cfs_block_allsigs);
 335 EXPORT_SYMBOL(cfs_block_sigs);
 336 EXPORT_SYMBOL(cfs_get_blockedsigs);
 337 EXPORT_SYMBOL(cfs_restore_sigs);
 338 EXPORT_SYMBOL(cfs_signal_pending);
 339 EXPORT_SYMBOL(cfs_clear_sigpending);