Mike Yuan
efb6a76a2a
This calculates the physical offset of a file on btrfs, similar to what FIEMAP does on other filesystems. The implementation should generally be kept in sync with btrfs-progs' inspect-internal map-swapfile command: https://github.com/kdave/btrfs-progs/blob/92d04d4780886a9850716e5529f1dace97779931/cmds/inspect.c#L1516 Preparation for #25130
System and Service Manager
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