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#ifndef _LINUX_LOCKS_H

#define _LINUX_LOCKS_H

#ifndef _LINUX_MM_H

#include <linux/mm.h>

#endif

#ifndef _LINUX_PAGEMAP_H

#include <linux/pagemap.h>

#endif

/*

 * Unlocked, temporary IO buffer_heads gets moved to the reuse_list

 * once their page becomes unlocked.

 */

extern struct buffer_head *reuse_list;

/*

 * 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 (test_bit(BH_Lock, &bh->b_state))

                __wait_on_buffer(bh);

}

extern inline void lock_buffer(struct buffer_head * bh)

{

        while (set_bit(BH_Lock, &bh->b_state))

                __wait_on_buffer(bh);

}

void unlock_buffer(struct buffer_head *);

/*

 * super-block locking. Again, interrupts may only unlock

 * a super-block (although even this isn't done right now.

 * nfs may need it).

 */

extern void __wait_on_super(struct super_block *);

extern inline void wait_on_super(struct super_block * sb)

{

        if (sb->s_lock)

                __wait_on_super(sb);

}

extern inline void lock_super(struct super_block * sb)

{

        if (sb->s_lock)

                __wait_on_super(sb);

        sb->s_lock = 1;

}

extern inline void unlock_super(struct super_block * sb)

{

        sb->s_lock = 0;

        wake_up(&sb->s_wait);

}

#endif /* _LINUX_LOCKS_H */