The present application discloses a method, device, device, and storage medium for mixed reading and writing of SSDs. The method includes: when a write request is received, lock processing is performed through a lock manager; when a read request is received, an application is made to the lock manager Lock, when the lock is applied for, the read operation is performed, and when the lock is not applied for, it is hung on the pending list. This application uses a special lock manager to manage read-write locks, which can realize read-write and unlock in the IO process, ensure the atomicity of writing in mixed reading and writing, and ensure the correctness of data during mixed reading and writing. In addition, due to the use of Managed by a dedicated lock manager, which can reduce IO latency.