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/fs_struct.h>
  44 #include <linux/sched.h>
  45
  46 #include <libcfs/libcfs.h>
  47
  48 #if defined(CONFIG_KGDB)
  49 #include <asm/kgdb.h>
  50 #endif
  51
  52 #define LINUX_WAITQ(w) ((wait_queue_t *) w)
  53 #define LINUX_WAITQ_HEAD(w) ((wait_queue_head_t *) w)
  54
  55 void
  56 cfs_waitq_init(cfs_waitq_t *waitq)
  57 {
  58         init_waitqueue_head(LINUX_WAITQ_HEAD(waitq));
  59 }
  60 EXPORT_SYMBOL(cfs_waitq_init);
  61
  62 void
  63 cfs_waitlink_init(cfs_waitlink_t *link)
  64 {
  65         init_waitqueue_entry(LINUX_WAITQ(link), current);
  66 }
  67 EXPORT_SYMBOL(cfs_waitlink_init);
  68
  69 void
  70 cfs_waitq_add(cfs_waitq_t *waitq, cfs_waitlink_t *link)
  71 {
  72         add_wait_queue(LINUX_WAITQ_HEAD(waitq), LINUX_WAITQ(link));
  73 }
  74 EXPORT_SYMBOL(cfs_waitq_add);
  75
  76 void
  77 cfs_waitq_add_exclusive(cfs_waitq_t *waitq,
  78                              cfs_waitlink_t *link)
  79 {
  80         add_wait_queue_exclusive(LINUX_WAITQ_HEAD(waitq), LINUX_WAITQ(link));
  81 }
  82 EXPORT_SYMBOL(cfs_waitq_add_exclusive);
  83
  84 void
  85 cfs_waitq_del(cfs_waitq_t *waitq, cfs_waitlink_t *link)
  86 {
  87         remove_wait_queue(LINUX_WAITQ_HEAD(waitq), LINUX_WAITQ(link));
  88 }
  89 EXPORT_SYMBOL(cfs_waitq_del);
  90
  91 int
  92 cfs_waitq_active(cfs_waitq_t *waitq)
  93 {
  94         return waitqueue_active(LINUX_WAITQ_HEAD(waitq));
  95 }
  96 EXPORT_SYMBOL(cfs_waitq_active);
  97
  98 void
  99 cfs_waitq_signal(cfs_waitq_t *waitq)
 100 {
 101         wake_up(LINUX_WAITQ_HEAD(waitq));
 102 }
 103 EXPORT_SYMBOL(cfs_waitq_signal);
 104
 105 void
 106 cfs_waitq_signal_nr(cfs_waitq_t *waitq, int nr)
 107 {
 108         wake_up_nr(LINUX_WAITQ_HEAD(waitq), nr);
 109 }
 110 EXPORT_SYMBOL(cfs_waitq_signal_nr);
 111
 112 void
 113 cfs_waitq_broadcast(cfs_waitq_t *waitq)
 114 {
 115         wake_up_all(LINUX_WAITQ_HEAD(waitq));
 116 }
 117 EXPORT_SYMBOL(cfs_waitq_broadcast);
 118
 119 void
 120 cfs_waitq_wait(cfs_waitlink_t *link, cfs_task_state_t state)
 121 {
 122         schedule();
 123 }
 124 EXPORT_SYMBOL(cfs_waitq_wait);
 125
 126 int64_t
 127 cfs_waitq_timedwait(cfs_waitlink_t *link, cfs_task_state_t state, int64_t timeout)
 128 {
 129         return schedule_timeout(timeout);
 130 }
 131 EXPORT_SYMBOL(cfs_waitq_timedwait);
 132
 133 void
 134 cfs_schedule_timeout(cfs_task_state_t state, int64_t timeout)
 135 {
 136         set_current_state(state);
 137         schedule_timeout(timeout);
 138 }
 139 EXPORT_SYMBOL(cfs_schedule_timeout);
 140
 141 void
 142 cfs_schedule(void)
 143 {
 144         schedule();
 145 }
 146 EXPORT_SYMBOL(cfs_schedule);
 147
 148 /* deschedule for a bit... */
 149 void
 150 cfs_pause(cfs_duration_t ticks)
 151 {
 152         set_current_state(TASK_UNINTERRUPTIBLE);
 153         schedule_timeout(ticks);
 154 }
 155 EXPORT_SYMBOL(cfs_pause);
 156
 157 int cfs_need_resched(void)
 158 {
 159         return need_resched();
 160 }
 161 EXPORT_SYMBOL(cfs_need_resched);
 162
 163 void cfs_cond_resched(void)
 164 {
 165         cond_resched();
 166 }
 167 EXPORT_SYMBOL(cfs_cond_resched);
 168
 169 void cfs_init_timer(cfs_timer_t *t)
 170 {
 171         init_timer(t);
 172 }
 173 EXPORT_SYMBOL(cfs_init_timer);
 174
 175 void cfs_timer_init(cfs_timer_t *t, cfs_timer_func_t *func, void *arg)
 176 {
 177         init_timer(t);
 178         t->function = func;
 179         t->data = (unsigned long)arg;
 180 }
 181 EXPORT_SYMBOL(cfs_timer_init);
 182
 183 void cfs_timer_done(cfs_timer_t *t)
 184 {
 185         return;
 186 }
 187 EXPORT_SYMBOL(cfs_timer_done);
 188
 189 void cfs_timer_arm(cfs_timer_t *t, cfs_time_t deadline)
 190 {
 191         mod_timer(t, deadline);
 192 }
 193 EXPORT_SYMBOL(cfs_timer_arm);
 194
 195 void cfs_timer_disarm(cfs_timer_t *t)
 196 {
 197         del_timer(t);
 198 }
 199 EXPORT_SYMBOL(cfs_timer_disarm);
 200
 201 int  cfs_timer_is_armed(cfs_timer_t *t)
 202 {
 203         return timer_pending(t);
 204 }
 205 EXPORT_SYMBOL(cfs_timer_is_armed);
 206
 207 cfs_time_t cfs_timer_deadline(cfs_timer_t *t)
 208 {
 209         return t->expires;
 210 }
 211 EXPORT_SYMBOL(cfs_timer_deadline);
 212
 213 void cfs_enter_debugger(void)
 214 {
 215 #if defined(CONFIG_KGDB)
 216 //        BREAKPOINT();
 217 #elif defined(__arch_um__)
 218         asm("int $3");
 219 #else
 220         /* nothing */
 221 #endif
 222 }
 223
 224 void cfs_daemonize(char *str) {
 225         unsigned long flags;
 226
 227         lock_kernel();
 228         daemonize(str);
 229         SIGNAL_MASK_LOCK(current, flags);
 230         sigfillset(&current->blocked);
 231         RECALC_SIGPENDING;
 232         SIGNAL_MASK_UNLOCK(current, flags);
 233         unlock_kernel();
 234 }
 235
 236 int cfs_daemonize_ctxt(char *str) {
 237
 238         cfs_daemonize(str);
 239 #ifndef HAVE_UNSHARE_FS_STRUCT
 240         {
 241         struct task_struct *tsk = current;
 242         struct fs_struct *fs = NULL;
 243         fs = copy_fs_struct(tsk->fs);
 244         if (fs == NULL)
 245                 return -ENOMEM;
 246         exit_fs(tsk);
 247         tsk->fs = fs;
 248         }
 249 #else
 250         unshare_fs_struct();
 251 #endif
 252         return 0;
 253 }
 254
 255 sigset_t
 256 cfs_get_blockedsigs(void)
 257 {
 258         unsigned long          flags;
 259         sigset_t        old;
 260
 261         SIGNAL_MASK_LOCK(current, flags);
 262         old = current->blocked;
 263         SIGNAL_MASK_UNLOCK(current, flags);
 264         return old;
 265 }
 266
 267 sigset_t
 268 cfs_block_allsigs(void)
 269 {
 270         unsigned long          flags;
 271         sigset_t        old;
 272
 273         SIGNAL_MASK_LOCK(current, flags);
 274         old = current->blocked;
 275         sigfillset(&current->blocked);
 276         RECALC_SIGPENDING;
 277         SIGNAL_MASK_UNLOCK(current, flags);
 278
 279         return old;
 280 }
 281
 282 sigset_t
 283 cfs_block_sigs(sigset_t bits)
 284 {
 285         unsigned long  flags;
 286         sigset_t        old;
 287
 288         SIGNAL_MASK_LOCK(current, flags);
 289         old = current->blocked;
 290         current->blocked = bits;
 291         RECALC_SIGPENDING;
 292         SIGNAL_MASK_UNLOCK(current, flags);
 293         return old;
 294 }
 295
 296 void
 297 cfs_restore_sigs (cfs_sigset_t old)
 298 {
 299         unsigned long  flags;
 300
 301         SIGNAL_MASK_LOCK(current, flags);
 302         current->blocked = old;
 303         RECALC_SIGPENDING;
 304         SIGNAL_MASK_UNLOCK(current, flags);
 305 }
 306
 307 int
 308 cfs_signal_pending(void)
 309 {
 310         return signal_pending(current);
 311 }
 312
 313 void
 314 cfs_clear_sigpending(void)
 315 {
 316         unsigned long flags;
 317
 318         SIGNAL_MASK_LOCK(current, flags);
 319         CLEAR_SIGPENDING;
 320         SIGNAL_MASK_UNLOCK(current, flags);
 321 }
 322
 323 int
 324 libcfs_arch_init(void)
 325 {
 326         return 0;
 327 }
 328
 329 void
 330 libcfs_arch_cleanup(void)
 331 {
 332         return;
 333 }
 334
 335 EXPORT_SYMBOL(libcfs_arch_init);
 336 EXPORT_SYMBOL(libcfs_arch_cleanup);
 337 EXPORT_SYMBOL(cfs_enter_debugger);
 338 EXPORT_SYMBOL(cfs_daemonize);
 339 EXPORT_SYMBOL(cfs_daemonize_ctxt);
 340 EXPORT_SYMBOL(cfs_block_allsigs);
 341 EXPORT_SYMBOL(cfs_block_sigs);
 342 EXPORT_SYMBOL(cfs_get_blockedsigs);
 343 EXPORT_SYMBOL(cfs_restore_sigs);
 344 EXPORT_SYMBOL(cfs_signal_pending);
 345 EXPORT_SYMBOL(cfs_clear_sigpending);