rcore-os / rcore-os/rCore-Tutorial-v3

第9章之后easy-fs仍然使用自旋锁而非关中断锁

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@wyfcyx is already working on this.

Since Feb 9, 2023.

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Description

问题：第9章开始，内核在执行系统调用的时候打开中断，因此内核自身的同步设施需要从单核独占访问UPSafeCell换成关中断版本的UPIntrFreeCell。然而，文件系统模块easy-fs仍然使用自旋锁spin::Mutex，就有可能在持有锁进行文件系统操作的时候，进入中断并再次尝试获取文件系统的锁而造成死锁。
触发方法：比如这种并发进行多个fork+exec的情况。
解决方案：将UPIntrFreeCell分离到一个独立的crate中，使得内核本体和easy-fs均依赖它。

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