#ifndef _LINUX_LOCKS_H
|
#ifndef _LINUX_LOCKS_H
|
#define _LINUX_LOCKS_H
|
#define _LINUX_LOCKS_H
|
|
|
#ifndef _LINUX_MM_H
|
#ifndef _LINUX_MM_H
|
#include <linux/mm.h>
|
#include <linux/mm.h>
|
#endif
|
#endif
|
#ifndef _LINUX_PAGEMAP_H
|
#ifndef _LINUX_PAGEMAP_H
|
#include <linux/pagemap.h>
|
#include <linux/pagemap.h>
|
#endif
|
#endif
|
|
|
/*
|
/*
|
* Unlocked, temporary IO buffer_heads gets moved to the reuse_list
|
* Unlocked, temporary IO buffer_heads gets moved to the reuse_list
|
* once their page becomes unlocked.
|
* once their page becomes unlocked.
|
*/
|
*/
|
extern struct buffer_head *reuse_list;
|
extern struct buffer_head *reuse_list;
|
|
|
/*
|
/*
|
* Buffer cache locking - note that interrupts may only unlock, not
|
* Buffer cache locking - note that interrupts may only unlock, not
|
* lock buffers.
|
* lock buffers.
|
*/
|
*/
|
extern void __wait_on_buffer(struct buffer_head *);
|
extern void __wait_on_buffer(struct buffer_head *);
|
|
|
extern inline void wait_on_buffer(struct buffer_head * bh)
|
extern inline void wait_on_buffer(struct buffer_head * bh)
|
{
|
{
|
if (test_bit(BH_Lock, &bh->b_state))
|
if (test_bit(BH_Lock, &bh->b_state))
|
__wait_on_buffer(bh);
|
__wait_on_buffer(bh);
|
}
|
}
|
|
|
extern inline void lock_buffer(struct buffer_head * bh)
|
extern inline void lock_buffer(struct buffer_head * bh)
|
{
|
{
|
while (set_bit(BH_Lock, &bh->b_state))
|
while (set_bit(BH_Lock, &bh->b_state))
|
__wait_on_buffer(bh);
|
__wait_on_buffer(bh);
|
}
|
}
|
|
|
void unlock_buffer(struct buffer_head *);
|
void unlock_buffer(struct buffer_head *);
|
|
|
|
|
/*
|
/*
|
* super-block locking. Again, interrupts may only unlock
|
* super-block locking. Again, interrupts may only unlock
|
* a super-block (although even this isn't done right now.
|
* a super-block (although even this isn't done right now.
|
* nfs may need it).
|
* nfs may need it).
|
*/
|
*/
|
extern void __wait_on_super(struct super_block *);
|
extern void __wait_on_super(struct super_block *);
|
|
|
extern inline void wait_on_super(struct super_block * sb)
|
extern inline void wait_on_super(struct super_block * sb)
|
{
|
{
|
if (sb->s_lock)
|
if (sb->s_lock)
|
__wait_on_super(sb);
|
__wait_on_super(sb);
|
}
|
}
|
|
|
extern inline void lock_super(struct super_block * sb)
|
extern inline void lock_super(struct super_block * sb)
|
{
|
{
|
if (sb->s_lock)
|
if (sb->s_lock)
|
__wait_on_super(sb);
|
__wait_on_super(sb);
|
sb->s_lock = 1;
|
sb->s_lock = 1;
|
}
|
}
|
|
|
extern inline void unlock_super(struct super_block * sb)
|
extern inline void unlock_super(struct super_block * sb)
|
{
|
{
|
sb->s_lock = 0;
|
sb->s_lock = 0;
|
wake_up(&sb->s_wait);
|
wake_up(&sb->s_wait);
|
}
|
}
|
|
|
#endif /* _LINUX_LOCKS_H */
|
#endif /* _LINUX_LOCKS_H */
|
|
|
|
|
