//
// $Header: D:/ext2-os2/include/linux/RCS/locks.h,v 1.3 1995/08/16 17:40:26 Willm Exp Willm $
//

// Linux ext2 file system driver for OS/2 2.x and WARP - Allows OS/2 to     
// access your Linux ext2fs partitions as normal drive letters.
// OS/2 implementation : Copyright (C) 1995  Matthieu WILLM
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.




#ifndef _LINUX_LOCKS_H
#define _LINUX_LOCKS_H


#ifdef OS2
#define inline _inline
#endif

/*
 * Buffer cache locking - note that interrupts may only unlock, not
 * lock buffers.
 */
extern void __wait_on_buffer(struct buffer_head *);

extern inline void wait_on_buffer(struct buffer_head * bh)
{
	if (bh->b_lock)
		__wait_on_buffer(bh);
}

extern inline void lock_buffer(struct buffer_head * bh)
{
	if (bh->b_lock)
		__wait_on_buffer(bh);
	bh->b_lock = 1;
}

extern inline void unlock_buffer(struct buffer_head * bh)
{
	bh->b_lock = 0;
	wake_up(&bh->b_wait);
}


extern void unlock_super(struct super_block * sb);
extern void lock_super(struct super_block * sb);
extern void wait_on_super(struct super_block * sb);


#endif /* _LINUX_LOCKS_H */