Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[linux-2.6.git] / fs / jfs / jfs_lock.h
1 /*
2  *   Copyright (C) International Business Machines Corp., 2000-2001
3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
4  *
5  *   This program is free software;  you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13  *   the GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program;  if not, write to the Free Software
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19 #ifndef _H_JFS_LOCK
20 #define _H_JFS_LOCK
21
22 #include <linux/spinlock.h>
23 #include <linux/mutex.h>
24 #include <linux/sched.h>
25
26 /*
27  *      jfs_lock.h
28  */
29
30 /*
31  * Conditional sleep where condition is protected by spinlock
32  *
33  * lock_cmd and unlock_cmd take and release the spinlock
34  */
35 #define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd)    \
36 do {                                                    \
37         DECLARE_WAITQUEUE(__wait, current);             \
38                                                         \
39         add_wait_queue(&wq, &__wait);                   \
40         for (;;) {                                      \
41                 set_current_state(TASK_UNINTERRUPTIBLE);\
42                 if (cond)                               \
43                         break;                          \
44                 unlock_cmd;                             \
45                 io_schedule();                          \
46                 lock_cmd;                               \
47         }                                               \
48         __set_current_state(TASK_RUNNING);                      \
49         remove_wait_queue(&wq, &__wait);                \
50 } while (0)
51
52 #endif                          /* _H_JFS_LOCK */