Rapid reliable file system access

A method comprising:

• receiving a file system (FS) write command;
• determining whether a write count of a physical super management unit (PSMU) of a non-volatile memory device satisfies a threshold criterion;
• responsive to the write count satisfying the threshold criterion, recording a change of a super management unit (SMU) mapping for FS data of an FS mapping table, wherein the FS mapping table is a portion of a logical-to-physical (L2P) mapping table, the FS mapping table comprising a record of an FS data mapping, and the L2P mapping table comprising an FS data mapping portion and a host data mapping portion;
• performing a move of SMU data corresponding to the change of the SMU mapping;
• creating a backup copy of the FS mapping table, in a location on the non-volatile memory device that is different than the location where the L2P mapping table is saved, the backup copy comprising the record of the FS data mapping;
• and
• responsive to a power cycle, restoring, by a processing device, the FS mapping table to a volatile memory device from the backup copy of the FS mapping table.

A non-transitory computer-readable storage medium comprising instructions that, when executed by a processing device, cause the processing device to perform operations comprising:

• recording a change of a super management unit (SMU) mapping for FS data of an FS mapping table, wherein the FS mapping table is a portion of a logical-to-physical (L2P) mapping table, the FS mapping table comprising a record of an FS data mapping, and the L2P mapping table comprising an FS data mapping portion and a host data mapping portion;
• performing a move of SMU data corresponding to the change of the SMU mapping;
• creating a backup copy of the FS mapping table, in a location on a non-volatile memory device that is different than the location where the L2P mapping table is saved, the backup copy comprising the record of the FS data mapping;
• updating the L2P mapping table with the recorded change of the SMU mapping;
• responsive to a power cycle, restoring the FS mapping table to a volatile memory device from the backup copy of the FS mapping table;
• and
• initiating a rebuilding of the L2P mapping table on the volatile memory device.