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 [sun.com URL with a
  20  * copy of GPLv2].
  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 void cfs_init_timer(cfs_timer_t *t)
 157 {
 158         init_timer(t);
 159 }
 160 EXPORT_SYMBOL(cfs_init_timer);
 161
 162 void cfs_timer_init(cfs_timer_t *t, cfs_timer_func_t *func, void *arg)
 163 {
 164         init_timer(t);
 165         t->function = func;
 166         t->data = (unsigned long)arg;
 167 }
 168 EXPORT_SYMBOL(cfs_timer_init);
 169
 170 void cfs_timer_done(cfs_timer_t *t)
 171 {
 172         return;
 173 }
 174 EXPORT_SYMBOL(cfs_timer_done);
 175
 176 void cfs_timer_arm(cfs_timer_t *t, cfs_time_t deadline)
 177 {
 178         mod_timer(t, deadline);
 179 }
 180 EXPORT_SYMBOL(cfs_timer_arm);
 181
 182 void cfs_timer_disarm(cfs_timer_t *t)
 183 {
 184         del_timer(t);
 185 }
 186 EXPORT_SYMBOL(cfs_timer_disarm);
 187
 188 int  cfs_timer_is_armed(cfs_timer_t *t)
 189 {
 190         return timer_pending(t);
 191 }
 192 EXPORT_SYMBOL(cfs_timer_is_armed);
 193
 194 cfs_time_t cfs_timer_deadline(cfs_timer_t *t)
 195 {
 196         return t->expires;
 197 }
 198 EXPORT_SYMBOL(cfs_timer_deadline);
 199
 200 void cfs_enter_debugger(void)
 201 {
 202 #if defined(CONFIG_KGDB)
 203         BREAKPOINT();
 204 #elif defined(__arch_um__)
 205         asm("int $3");
 206 #else
 207         /* nothing */
 208 #endif
 209 }
 210
 211 void cfs_daemonize(char *str) {
 212         unsigned long flags;
 213
 214         lock_kernel();
 215 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,63))
 216         daemonize(str);
 217 #else
 218         daemonize();
 219         exit_files(current);
 220         reparent_to_init();
 221         snprintf (current->comm, sizeof (current->comm), "%s", str);
 222 #endif
 223         SIGNAL_MASK_LOCK(current, flags);
 224         sigfillset(&current->blocked);
 225         RECALC_SIGPENDING;
 226         SIGNAL_MASK_UNLOCK(current, flags);
 227         unlock_kernel();
 228 }
 229
 230 int cfs_daemonize_ctxt(char *str) {
 231         struct task_struct *tsk = current;
 232         struct fs_struct *fs = NULL;
 233
 234         cfs_daemonize(str);
 235         fs = copy_fs_struct(tsk->fs);
 236         if (fs == NULL)
 237                 return -ENOMEM;
 238         exit_fs(tsk);
 239         tsk->fs = fs;
 240         return 0;
 241 }
 242
 243
 244 sigset_t
 245 cfs_get_blockedsigs(void)
 246 {
 247         unsigned long          flags;
 248         sigset_t        old;
 249
 250         SIGNAL_MASK_LOCK(current, flags);
 251         old = current->blocked;
 252         SIGNAL_MASK_UNLOCK(current, flags);
 253         return old;
 254 }
 255
 256 sigset_t
 257 cfs_block_allsigs(void)
 258 {
 259         unsigned long          flags;
 260         sigset_t        old;
 261
 262         SIGNAL_MASK_LOCK(current, flags);
 263         old = current->blocked;
 264         sigfillset(&current->blocked);
 265         RECALC_SIGPENDING;
 266         SIGNAL_MASK_UNLOCK(current, flags);
 267
 268         return old;
 269 }
 270
 271 sigset_t
 272 cfs_block_sigs(sigset_t bits)
 273 {
 274         unsigned long  flags;
 275         sigset_t        old;
 276
 277         SIGNAL_MASK_LOCK(current, flags);
 278         old = current->blocked;
 279         current->blocked = bits;
 280         RECALC_SIGPENDING;
 281         SIGNAL_MASK_UNLOCK(current, flags);
 282         return old;
 283 }
 284
 285 void
 286 cfs_restore_sigs (cfs_sigset_t old)
 287 {
 288         unsigned long  flags;
 289
 290         SIGNAL_MASK_LOCK(current, flags);
 291         current->blocked = old;
 292         RECALC_SIGPENDING;
 293         SIGNAL_MASK_UNLOCK(current, flags);
 294 }
 295
 296 int
 297 cfs_signal_pending(void)
 298 {
 299         return signal_pending(current);
 300 }
 301
 302 void
 303 cfs_clear_sigpending(void)
 304 {
 305         unsigned long flags;
 306
 307         SIGNAL_MASK_LOCK(current, flags);
 308         CLEAR_SIGPENDING;
 309         SIGNAL_MASK_UNLOCK(current, flags);
 310 }
 311
 312 int
 313 libcfs_arch_init(void)
 314 {
 315         return 0;
 316 }
 317
 318 void
 319 libcfs_arch_cleanup(void)
 320 {
 321         return;
 322 }
 323
 324 EXPORT_SYMBOL(libcfs_arch_init);
 325 EXPORT_SYMBOL(libcfs_arch_cleanup);
 326 EXPORT_SYMBOL(cfs_daemonize);
 327 EXPORT_SYMBOL(cfs_daemonize_ctxt);
 328 EXPORT_SYMBOL(cfs_block_allsigs);
 329 EXPORT_SYMBOL(cfs_block_sigs);
 330 EXPORT_SYMBOL(cfs_get_blockedsigs);
 331 EXPORT_SYMBOL(cfs_restore_sigs);
 332 EXPORT_SYMBOL(cfs_signal_pending);
 333 EXPORT_SYMBOL(cfs_clear_sigpending);