inode 等待dio完成

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最新推荐文章于 2024-05-29 21:26:00 发布

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分类专栏： Linux 文件系统 VFS

本文链接：https://blog.youkuaiyun.com/sunlei0625/article/details/61647805

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本文介绍了一个用于等待所有挂起的直接I/O请求完成的函数inode_dio_wait，该函数确保在进行截断等操作前所有的直接I/O操作都已经完成。通常在inode->i_mutex锁保护下调用此函数。

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/**
 * inode_dio_wait - wait for outstanding DIO requests to finish
 * @inode: inode to wait for
 *
 * Waits for all pending direct I/O requests to finish so that we can
 * proceed with a truncate or equivalent operation.
 *
 * Must be called under a lock that serializes taking new references
 * to i_dio_count, usually by inode->i_mutex.
 */
void inode_dio_wait(struct inode *inode)
{
	if (atomic_read(&inode->i_dio_count))
		__inode_dio_wait(inode);
}
EXPORT_SYMBOL(inode_dio_wait);

/*
 * Direct i/o helper functions
 */
static void __inode_dio_wait(struct inode *inode)
{
	wait_queue_head_t *wq = bit_waitqueue(&inode->i_state, __I_DIO_WAKEUP);
	DEFINE_WAIT_BIT(q, &inode->i_state, __I_DIO_WAKEUP);


	do {
		prepare_to_wait(wq, &q.wait, TASK_UNINTERRUPTIBLE);
		if (atomic_read(&inode->i_dio_count))
			schedule();
	} while (atomic_read(&inode->i_dio_count));
	finish_wait(wq, &q.wait);
}