Systems and methods for cooperative caching between file systems and block storage

Patent metadata

Field	Value
Publication number	US-12386752-B2
Application number	US-202318160077-A
Country	US
Kind code	B2
Filing date	Jan 26, 2023
Priority date	Jan 26, 2023
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

A method, computer program product, and computer system for receiving, by a computing device, a write request, wherein the write request may be received by a file system of the computing device. Data associated with the write request may be stored in a cache of the file system and a cache of a block storage system corresponding to the file system. A tag associated with the data in the cache of the block storage system may be received by the block storage system. The data in the cache of the block storage system may be freed after flushing the data to persistent storage based upon, at least in part, the tag associated with the data in the cache of the block storage system. As a result, there is optimization for the read path due to no double caching in the block cache.

First claim

What is claimed is:

1. A computer-implemented method comprising:
receiving, by a computing device, a write request, wherein the write request is received by a file system of the computing device;
storing data associated with the write request in a cache of the file system and a cache of a block storage system corresponding to the file system;
receiving, by the block storage system, a first tag associated with the data in the cache of the block storage system,
wherein compression of the data in the cache of the block storage system cache is avoided based upon, at least in part, the first tag associated with the data in the cache of the block storage system, and
wherein duplication of the data in the cache of the block storage system cache is avoided based upon, at least in part, the first tag associated with the data in the cache of the block storage system; and

freeing the data in the cache of the block storage system after flushing the data to persistent storage based upon, at least in part, the first tag associated with the data in the cache of the block storage system.

2. The computer-implemented method of claim 1 further comprising receiving a read request, wherein the read request is received by the file system.

3. The computer-implemented method of claim 2 further comprising receiving, by the block storage system, a second tag associated with the read request.

4. The computer-implemented method of claim 3 further comprising instructing the block storage system not to cache the data associated with the read request in the cache of the block storage system based upon, at least in part, the second tag associated with the read request.

5. The computer-implemented method of claim 4 further comprising reading the data associated with the read request from the cache of the file system.

6. The computer-implemented method of claim 1 wherein the cache of the block storage system is a clean cache.

7. A computer program product residing on a non-transitory computer readable storage medium having a plurality of instructions stored thereon which, when executed across one or more processors, causes at least a portion of the one or more processors to perform operations comprising:
receiving a write request, wherein the write request is received by a file system of the computing device;
storing data associated with the write request in a cache of the file system and a cache of a block storage system corresponding to the file system;
receiving, by the block storage system, a first tag associated with the data in the cache of the block storage system,
wherein compression of the data in the cache of the block storage system cache is avoided based upon, at least in part, the first tag associated with the data in the cache of the block storage system, and
wherein duplication of the data in the cache of the block storage system cache is avoided based upon, at least in part, the first tag associated with the data in the cache of the block storage system; and

freeing the data in the cache of the block storage system after flushing the data to persistent storage based upon, at least in part, the first tag associated with the data in the cache of the block storage system.

8. The computer program product of claim 7 wherein the operations further comprise receiving a read request, wherein the read request is received by the file system.

9. The computer program product of claim 8 wherein the operations further comprise receiving, by the block storage system, a second tag associated with the read request.

10. The computer program product of claim 9 wherein the operations further comprise instructing the block storage system not to cache the data associated with the read request in the cache of the block storage system based upon, at least in part, the second tag associated with the read request.

11. The computer program product of claim 10 wherein the operations further comprise reading the data associated with the read request from the cache of the file system.

12. The computer program product of claim 7 wherein the cache of the block storage system is a clean cache.

13. A computing system including one or more processors and one or more memories configured to perform operations comprising:
receiving a write request, wherein the write request is received by a file system of the computing device;
storing data associated with the write request in a cache of the file system and a cache of a block storage system corresponding to the file system;
receiving, by the block storage system, a first tag associated with the data in the cache of the block storage system,
wherein compression of the data in the cache of the block storage system cache is avoided based upon, at least in part, the first tag associated with the data in the cache of the block storage system, and
wherein duplication of the data in the cache of the block storage system cache is avoided based upon, at least in part, the first tag associated with the data in the cache of the block storage system; and

freeing the data in the cache of the block storage system after flushing the data to persistent storage based upon, at least in part, the first tag associated with the data in the cache of the block storage system.

14. The computing system of claim 13 wherein the operations further comprise receiving a read request, wherein the read request is received by the file system.

15. The computing system of claim 14 wherein the operations further comprise receiving, by the block storage system, a second tag associated with the read request.

16. The computing system of claim 15 wherein the operations further comprise instructing the block storage system not to cache the data associated with the read request in the cache of the block storage system based upon, at least in part, the second tag associated with the read request.

17. The computing system of claim 16 wherein the operations further comprise reading the data associated with the read request from the cache of the file system.

Assignees

• Dell Products Lp

Inventors

• Subramanian Vasudevan
• Armangau Philippe
• Forrester Walter
• Corniquet Frederic

Classifications

• G06F12/0895

  of parts of caches, e.g. directory or tag array · CPC title

• G06F13/1668 Primary

  Details of memory controller · CPC title

• G06F12/0871 Primary

  Allocation or management of cache space · CPC title

• G06F12/0804

  with main memory updating (G06F12/0806 takes precedence) · CPC title

• G06F12/0868

  Data transfer between cache memory and other subsystems, e.g. storage devices or host systems · CPC title