Access request processing method and apparatus, and computer system

A computer system comprising:

• a memory comprising a non-volatile memory (NVM), wherein the memory is configured to store instructions;
• and
• a processor coupled to the memory and configured to execute the instructions, which cause the processor to be configured to:
• receive a write request for writing to-be-written data;
• determine an object cache page corresponding to the to-be-written data, wherein the object cache page is a memory page for caching file data of an object file in an internal memory of the computer system, wherein the to-be-written data is used to modify the file data in the object cache page;
• determine that the NVM stores a log chain of the object cache page, wherein the log chain comprises a first data node, wherein the first data node comprises information about a first log data chunk of the object cache page, and wherein the first log data chunk comprises modified data of the object cache page during a modification of the object file;
• insert a second data node into the log chain, wherein the second data node comprises information about a second log data chunk of the object cache page, wherein the second log data chunk comprises at least part of the to-be-written data, and wherein the information about the second log data chunk comprises the second log data chunk or a storage address of the second log data chunk in the NVM;
• determine that an intra-page location of the second log data chunk overlaps an intra-page location of the first log data chunk, wherein the intra-page location of the second log data chunk is a location of the second log data chunk in the object cache page, and wherein the intra-page location of the first log data chunk is a location of the first log data chunk in the object cache page;
• and
• set, in the first data node, data that is in the first log data chunk and that overlaps the second log data chunk to invalid data.

A computer program product comprising computer-executable instructions stored on a non-transitory computer-readable medium that, when executed by a processor, cause an apparatus to:

• receive a write request for writing to-be-written data;
• determine an object cache page corresponding to the to-be-written data, wherein the object cache page is a memory page for caching file data of an object file in an internal memory of the apparatus, wherein the to-be-written data is used to modify the file data in the object cache page;
• determine that a non-volatile memory (NVM) stores a log chain, wherein the log chain comprises a first data node, wherein the first data node comprises information about a first log data chunk of the object cache page, and wherein the first log data chunk comprises modified data of the object cache page during a modification of the object file;
• insert a second data node into the log chain, wherein the second data node comprises information about a second log data chunk of the object cache page, wherein the second log data chunk comprises at least part of the to-be-written data, and the information about the second log data chunk comprises the second log data chunk or a storage address of the second log data chunk in the NVM;
• determine that an intra-page location of the second log data chunk overlaps an intra-page location of the first log data chunk, wherein the intra-page location of the second log data chunk is a location of the second log data chunk in the object cache page, and wherein the intra-page location of the first log data chunk is a location of the first log data chunk in the object cache page;
• and
• set, in the first data node, data that is in the first log data chunk and that overlaps the second log data chunk to invalid data.