Temporary mapping to avoid chain of virtuals for background deduplication

A method, comprising:

• based on ingesting a file into a log filesystem, creating, by a system comprising at least one processor, a first data structure that indicates a location of the file within the log filesystem, wherein the first data structure is persistent for a duration of storage of the file in the log filesystem;
• based on omitting a deduplication operation on the file at a time of the ingesting, creating, by the system, a second data structure that indicates the location of the file within the log filesystem, wherein the second data structure comprises a logical backpointer to the file in the log filesystem, and wherein the second data structure is persistent at least until the deduplication operation is performed on the file;
• and
• performing the deduplication operation subsequent to the creating of the second data structure, comprising:
• parsing, by the system, a chunk descriptor associated with a chunk of the file in the log filesystem to identify the second data structure,
• identifying, by the system, at least one active first virtual mapping structure that is associated with the file in the log filesystem,
• identifying, by the system, a deduplicated block associated with the file in the log filesystem, wherein the log filesystem implements block storage,
• updating, by the system, a leaf mapping block of the file to point to a virtual pointer that identifies data associated with the deduplicated block that is stored in another block, based on the logical backpointer of the second data structure, and
• after processing at least one second virtual mapping structure of the chunk, freeing, by the system, the second data structure.

A non-transitory computer-readable medium comprising instructions that, in response to execution, cause a system comprising at least one processor to perform operations, comprising:

• based on ingesting a file into a filesystem, creating a first data structure that indicates a location of the file within the filesystem;
• based on refraining from performing a deduplication operation on the file at a time of the ingesting, creating a second data structure that indicates the location of the file within the filesystem, wherein the second data structure comprises a logical backpointer to the file in the filesystem, and wherein the second data structure is persistent until the deduplication operation is performed on the file;
• and
• performing the deduplication operation subsequent to the creating of the second data structure, comprising:
• identifying the second data structure from a chunk descriptor associated with a chunk of the file in the filesystem,
• identifying active first virtual mapping structures that are associated with the file in the filesystem,
• identifying a deduplicated block associated with the file in the filesystem, wherein the filesystem implements block storage,
• updating a leaf mapping block of the file to point to a virtual pointer that identifies data associated with the deduplicated block that is stored in another block, based on the logical backpointer of the second data structure, and
• after processing second virtual mapping structures of the chunk, freeing memory associated with the second data structure.