Storage device and method and for storage device state recovery
View Patent ↗A storage device and method for storage device state recovery are provided. In one embodiment, a storage device commences an authentication process to authenticate a host device. The authentication process comprises a plurality of phases, and the storage device stores the state of the authentication process, wherein the state indicates the phase(s) of the authentication process that have been successfully completed. After a power loss, the storage device retrieves the state of the authentication process and resumes an operation with the host device without re-performing the phase(s) of the authentication process that have been completed.
1. A method for storage device recovery, the method comprising:
performing the following in a storage device:
commencing an authentication process to authenticate a host device, wherein the authentication process comprises a plurality of phases;
storing a state of the authentication process, wherein the state indicates the phase(s) of the authentication process that have been successfully completed;
after a power loss, receiving a recovery command from the host device;
determining if the recovery command indicates that the host device is a pre-authenticated entity;
if the storage device determines that the recovery command indicates that the host device is a pre-authenticated entity:
retrieving the state of the authentication process; and
resuming an operation with the host device without re-performing the phase(s) of the authentication process that have been completed; and
if the storage device determines that the recovery command does not indicate that the host device is a pre-authenticated entity, operating in a blocked state that indicates a failure to log in.
2. The method of claim 1 , wherein when the state indicates that all phases of the authentication process have been successfully completed, the operation with the host device resumes without requiring the host device to re-authenticate itself to the storage device.
3. The method of claim 1 , wherein the state is stored in a location in the storage device that is accessible by a controller of the storage device but not by the host device.
4. The method of claim 1 , wherein the state is stored automatically by the storage device.
5. The method of claim 1 , wherein the state is stored in response to a command from the host device.
6. The method of claim 1 further comprising operating in a logged-off state if the recovery command is not received.
7. The method of claim 1 , wherein the recovery command comprises a secure token.
8. The method of claim 7 , wherein the secure token comprises a function of a session key.
9. The method of claim 8 , wherein the secure token is also a function of a value of a counter.
10. The method of claim 7 , wherein the secure token comprises a function of a session ID.
11. The method of claim 10 , wherein the secure token is also a function of a value of a counter.
12. The method of claim 1 , wherein the recovery command is received from a different, but previously-authenticated, host device.
13. A storage device comprising:
an interface configured to communicate with a host device;
a memory; and
a controller in communication with the interface and the memory, wherein the controller is configured to:
commence an authentication process to authenticate a host device, wherein the authentication process comprises a plurality of phases;
store a state of the authentication process, wherein the state indicates the phase(s) of the authentication process that have been successfully completed;
after a power loss, receive a recovery command from the host device;
determine if the recovery command indicates that the host device is a pre-authenticated entity;
if the storage device determines that the recovery command indicates that the host device is a pre-authenticated entity:
retrieve the state of the authentication process; and
resume an operation with the host device without re-performing the phase(s) of the authentication process that have been completed; and
if the storage device determines that the recovery command does not indicate that the host device is a pre-authenticated entity, operate in a blocked state that indicates a failure to log in.
14. The storage device of claim 13 , wherein when the state indicates that all phases of the authentication process have been successfully completed, the operation with the host device resumes without requiring the host device to re-authenticate itself to the storage device.
15. The storage device of claim 13 , wherein the state is stored in a location in the memory that is accessible by the controller of the storage device but not by the host device.
16. The storage device of claim 13 , wherein the state is stored automatically by the controller.
17. The storage device of claim 13 , wherein the state is stored in response to a command from the host device.
18. The storage device of claim 13 , wherein the controller is configured to operate in a logged-off state if the recovery command is not received.
19. The storage device of claim 13 , wherein the recovery command comprises a secure token.
20. The storage device of claim 19 , wherein the secure token comprises a function of a session key.
21. The storage device of claim 20 , wherein the secure token is also a function of a value of a counter.
22. The storage device of claim 19 , wherein the secure token comprises a function of a session ID.
23. The storage device of claim 22 , wherein the secure token is also a function of a value of a counter.
24. The storage device of claim 13 , wherein the recovery command is received from a different, but previously-authenticated, host device.