Storage module and host device for storage module defragmentation

Patent metadata

Field	Value
Publication number	US-9652154-B2
Application number	US-201414249063-A
Country	US
Kind code	B2
Filing date	Apr 9, 2014
Priority date	Feb 5, 2014
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A storage module and host device for storage module defragmentation are disclosed. In one embodiment, a host controller sends a storage module a first set of logical block addresses of a file stored in the storage module. The host controller receives a metric from the storage module indicative of a fragmentation level of the file in physical blocks of memory in the storage module. If the metric is greater than a threshold, the host controller reads the file and then writes it back to the storage module using a different set of logical block addresses. To avoid sending the file back and forth, in another embodiment, the host controller sends the fragmentation threshold and the different set of logical block addresses to the storage module. The storage module then moves the file itself if the metric indicative of the fragmentation level is greater than the threshold. Other embodiments are provided.

First claim

What is claimed is:

1. A storage module comprising:
a memory; and
a storage controller operatively in communication with the memory, wherein the storage controller is configured to:
receive a command from a host controller to read a file stored in the storage module in a first set of logical block addresses;
send the file to the host controller;
receive the file back from the host controller along with a write command comprising a second set of logical block addresses and a writing mode to use to write the file; and
write the file in the storage module according to the writing mode.

2. The storage module of claim 1 , wherein the writing mode comprises a best effort mode, in which the storage module makes its best effort to write the file using a minimum number of physical blocks.

3. The storage module of claim 2 , wherein the storage controller is further configured to receive from the host controller an indication of a type of the file, wherein an effort the storage module makes to write the file is based on the type of the file.

4. The storage module of claim 1 , wherein the writing mode comprises a warranted mode in which the storage module must write the file using a minimum number of physical blocks.

5. The storage module of claim 1 , wherein the storage controller is further configured to:
receive from the host controller an indication that multiple non-consecutive logical block address ranges are part of a same file.

6. The storage module of claim 5 , wherein a command is used by the host controller to indicate to the storage module when multiple non-consecutive logical block address ranges are part of the same file.

7. The storage module of claim 5 , wherein the indication that multiple non-consecutive logical block address ranges are part of the same file comprises a flag.

8. The storage module of claim 1 , wherein the memory of the storage module is a three-dimensional memory.

9. The storage module of claim 1 , wherein the storage module is embedded in a host containing the host controller.

10. The storage module of claim 1 , wherein the storage module is removably connected to a host containing the host controller.

11. The storage module of claim 1 , wherein the storage module is a solid-state drive.

12. A method for storage module defragmentation, the method comprising:
performing the following in a storage module operatively in communication with a host controller:
receiving a command from the host controller to read a file stored in the storage module in a first set of logical block addresses;
sending the file to the host controller;
receiving the file back from the host controller along with a write command comprising a second set of logical block addresses and a writing mode to use to write the file; and
writing the file in the storage module according to the writing mode.

13. The method of claim 12 , wherein the writing mode comprises a best effort mode, in which the storage module makes its best effort to write the file using a minimum number of physical blocks.

14. The method of claim 13 further comprising receiving from the host controller an indication of a type of the file, wherein an effort the storage module makes to write the file is based on the type of the file.

15. The method of claim 12 , wherein the writing mode comprises a warranted mode in which the storage module must write the file using a minimum number of physical blocks.

16. The method of claim 12 further comprising:
receiving from the host controller an indication that multiple non-consecutive logical block address ranges are part of a same file.

17. The method of claim 16 , wherein a command is used by the host controller to indicate to the storage module when multiple non-consecutive logical block address ranges are part of the same file.

18. The method of claim 16 , wherein the indication that multiple non-consecutive logical block address ranges are part of the same file comprises a flag.

19. The method of claim 12 , wherein a memory of the storage module is a three-dimensional memory.

20. The method of claim 12 , wherein the storage module is embedded in a host containing the host controller.

21. The method of claim 12 , wherein the storage module is removably connected to a host containing the host controller.

22. The method of claim 12 , wherein the storage module is a solid-state drive.

23. A host device comprising:
an interface through which to operatively communicate with a storage module; and
a controller operatively in communication with the interface, wherein the controller is configured to:
send a command to the storage module to read a file stored in the storage module in a first set of logical block addresses;
receive the file from the storage module; and
send the file back to the storage module along with a write command comprising a second set of logical block addresses and a writing mode to use to write the file.

24. The host device of claim 23 , wherein the writing mode comprises a best effort mode, in which the storage module makes its best effort to write the file using a minimum number of physical blocks.

25. The host device of claim 24 , wherein the controller is further configured to send the storage module an indication of a type of the file, wherein an effort the storage module makes to write the file is based on the type of the file.

26. The host device of claim 23 , wherein the writing mode comprises a warranted mode in which the storage module must write the file using a minimum number of physical blocks.

27. The host device of claim 23 , wherein the controller is further configured to:
send the storage module an indication that multiple non-consecutive logical block address ranges are part of a same file.

28. The host device of claim 27 , wherein a command is used by the host device to indicate to the storage module when multiple non-consecutive logical block address ranges are part of the same file.

29. The host device of claim 27 , wherein the indication that multiple non-consecutive logical block address ranges are part of the same file comprises a flag.

30. The host device of claim 23 , wherein a memory of the storage module is a three-dimensional memory.

31. The host device of claim 23 , wherein the storage module is embedded in the host device.

32. The host device of claim 23 , wherein the storage module is removably connected to the host device.

33. The host device of claim 23 , wherein the storage module is a solid-state drive.

34. A method for storage module defragmentation, the method comprising:
performing the following in a host controller operatively in communication with a storage module:
sending a command to the storage module to read a file stored in the storage module in a first set of logical block addresses;
receiving the file from the storage module; and
sending the file back to the storage module along with a write command comprising a second set of logical block addresses and a writing mode to use to write the file.

35. The method of claim 34 , wherein the writing mode comprises a best effort mode, in which the storage module makes its best effort to write the file using a minimum number of physical blocks.

36. The metho

Assignees

• Sandisk Technologies Llc

Inventors

• Duzly Yacov
• Oshinsky Hadas
• Bar-Or Shahar
• Hahn Judah Gamliel

Classifications

• G06F3/061 Primary

  Improving I/O performance · CPC title

• G06F12/023

  Free address space management · CPC title

• G06F3/0643

  Management of files · CPC title

• G06F3/0679

  Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP] · CPC title

• G06F16/1724

  Details of de-fragmentation performed by the file system (saving storage space on storage systems G06F3/0608; management of blocks in storage devices G06F3/064) · CPC title