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 (c) 2008, 2010, Oracle and/or its affiliates. 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,
 128                     int64_t timeout)
 129 {
 130         return schedule_timeout(timeout);
 131 }
 132 EXPORT_SYMBOL(cfs_waitq_timedwait);
 133
 134 void
 135 cfs_schedule_timeout_and_set_state(cfs_task_state_t state, int64_t timeout)
 136 {
 137         set_current_state(state);
 138         schedule_timeout(timeout);
 139 }
 140 EXPORT_SYMBOL(cfs_schedule_timeout_and_set_state);
 141
 142 void
 143 cfs_schedule_timeout(int64_t timeout)
 144 {
 145         schedule_timeout(timeout);
 146 }
 147 EXPORT_SYMBOL(cfs_schedule_timeout);
 148
 149 void
 150 cfs_schedule(void)
 151 {
 152         schedule();
 153 }
 154 EXPORT_SYMBOL(cfs_schedule);
 155
 156 /* deschedule for a bit... */
 157 void
 158 cfs_pause(cfs_duration_t ticks)
 159 {
 160         set_current_state(TASK_UNINTERRUPTIBLE);
 161         schedule_timeout(ticks);
 162 }
 163 EXPORT_SYMBOL(cfs_pause);
 164
 165 int cfs_need_resched(void)
 166 {
 167         return need_resched();
 168 }
 169 EXPORT_SYMBOL(cfs_need_resched);
 170
 171 void cfs_cond_resched(void)
 172 {
 173         cond_resched();
 174 }
 175 EXPORT_SYMBOL(cfs_cond_resched);
 176
 177 void cfs_init_timer(cfs_timer_t *t)
 178 {
 179         init_timer(t);
 180 }
 181 EXPORT_SYMBOL(cfs_init_timer);
 182
 183 void cfs_timer_init(cfs_timer_t *t, cfs_timer_func_t *func, void *arg)
 184 {
 185         init_timer(t);
 186         t->function = func;
 187         t->data = (unsigned long)arg;
 188 }
 189 EXPORT_SYMBOL(cfs_timer_init);
 190
 191 void cfs_timer_done(cfs_timer_t *t)
 192 {
 193         return;
 194 }
 195 EXPORT_SYMBOL(cfs_timer_done);
 196
 197 void cfs_timer_arm(cfs_timer_t *t, cfs_time_t deadline)
 198 {
 199         mod_timer(t, deadline);
 200 }
 201 EXPORT_SYMBOL(cfs_timer_arm);
 202
 203 void cfs_timer_disarm(cfs_timer_t *t)
 204 {
 205         del_timer(t);
 206 }
 207 EXPORT_SYMBOL(cfs_timer_disarm);
 208
 209 int  cfs_timer_is_armed(cfs_timer_t *t)
 210 {
 211         return timer_pending(t);
 212 }
 213 EXPORT_SYMBOL(cfs_timer_is_armed);
 214
 215 cfs_time_t cfs_timer_deadline(cfs_timer_t *t)
 216 {
 217         return t->expires;
 218 }
 219 EXPORT_SYMBOL(cfs_timer_deadline);
 220
 221 void cfs_enter_debugger(void)
 222 {
 223 #if defined(CONFIG_KGDB)
 224 //        BREAKPOINT();
 225 #elif defined(__arch_um__)
 226         asm("int $3");
 227 #else
 228         /* nothing */
 229 #endif
 230 }
 231
 232 void cfs_daemonize(char *str) {
 233         unsigned long flags;
 234
 235         lock_kernel();
 236         daemonize(str);
 237         SIGNAL_MASK_LOCK(current, flags);
 238         sigfillset(&current->blocked);
 239         RECALC_SIGPENDING;
 240         SIGNAL_MASK_UNLOCK(current, flags);
 241         unlock_kernel();
 242 }
 243
 244 int cfs_daemonize_ctxt(char *str) {
 245
 246         cfs_daemonize(str);
 247 #ifndef HAVE_UNSHARE_FS_STRUCT
 248         {
 249         struct task_struct *tsk = current;
 250         struct fs_struct *fs = NULL;
 251         fs = copy_fs_struct(tsk->fs);
 252         if (fs == NULL)
 253                 return -ENOMEM;
 254         exit_fs(tsk);
 255         tsk->fs = fs;
 256         }
 257 #else
 258         unshare_fs_struct();
 259 #endif
 260         return 0;
 261 }
 262
 263 sigset_t
 264 cfs_block_allsigs(void)
 265 {
 266         unsigned long          flags;
 267         sigset_t        old;
 268
 269         SIGNAL_MASK_LOCK(current, flags);
 270         old = current->blocked;
 271         sigfillset(&current->blocked);
 272         RECALC_SIGPENDING;
 273         SIGNAL_MASK_UNLOCK(current, flags);
 274
 275         return old;
 276 }
 277
 278 sigset_t
 279 cfs_block_sigs(sigset_t bits)
 280 {
 281         unsigned long  flags;
 282         sigset_t        old;
 283
 284         SIGNAL_MASK_LOCK(current, flags);
 285         old = current->blocked;
 286         current->blocked = bits;
 287         RECALC_SIGPENDING;
 288         SIGNAL_MASK_UNLOCK(current, flags);
 289         return old;
 290 }
 291
 292 void
 293 cfs_restore_sigs (cfs_sigset_t old)
 294 {
 295         unsigned long  flags;
 296
 297         SIGNAL_MASK_LOCK(current, flags);
 298         current->blocked = old;
 299         RECALC_SIGPENDING;
 300         SIGNAL_MASK_UNLOCK(current, flags);
 301 }
 302
 303 int
 304 cfs_signal_pending(void)
 305 {
 306         return signal_pending(current);
 307 }
 308
 309 void
 310 cfs_clear_sigpending(void)
 311 {
 312         unsigned long flags;
 313
 314         SIGNAL_MASK_LOCK(current, flags);
 315         CLEAR_SIGPENDING;
 316         SIGNAL_MASK_UNLOCK(current, flags);
 317 }
 318
 319 int
 320 libcfs_arch_init(void)
 321 {
 322         return 0;
 323 }
 324
 325 void
 326 libcfs_arch_cleanup(void)
 327 {
 328         return;
 329 }
 330
 331 EXPORT_SYMBOL(libcfs_arch_init);
 332 EXPORT_SYMBOL(libcfs_arch_cleanup);
 333 EXPORT_SYMBOL(cfs_enter_debugger);
 334 EXPORT_SYMBOL(cfs_daemonize);
 335 EXPORT_SYMBOL(cfs_daemonize_ctxt);
 336 EXPORT_SYMBOL(cfs_block_allsigs);
 337 EXPORT_SYMBOL(cfs_block_sigs);
 338 EXPORT_SYMBOL(cfs_restore_sigs);
 339 EXPORT_SYMBOL(cfs_signal_pending);
 340 EXPORT_SYMBOL(cfs_clear_sigpending);