inode_double_lock.h

ocfs1.4.1 oracle分布式文件系统

#ifndef KAPI_INODE_DOUBLE_LOCK_H
#define KAPI_INODE_DOUBLE_LOCK_H

#ifdef NO_INODE_DOUBLE_LOCK
static inline void inode_double_lock(struct inode *inode1, struct inode *inode2)
{
	if (inode1 == NULL || inode2 == NULL || inode1 == inode2) {
		if (inode1)
			mutex_lock(&inode1->i_mutex);
		else if (inode2)
			mutex_lock(&inode2->i_mutex);
		return;
	}

	if (inode1 < inode2) {
		mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
		mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
	} else {
		mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT);
		mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD);
	}
}

static inline void inode_double_unlock(struct inode *inode1, struct inode *inode2)
{
	if (inode1)
		mutex_unlock(&inode1->i_mutex);

	if (inode2 && inode2 != inode1)
		mutex_unlock(&inode2->i_mutex);
}
#endif

#endif