
Most notable to Btrfs in Linux 4.21 is the long-awaited support for swap files on Btrfs is now working but with a number of limitations for the time being, such as no compression or snapshotting.
Other Btrfs work for Linux 4.21 includes the ability to assign a new file-system UUID without overwriting all metadata blocks, more balance messages being printed to the system log, and a variety of file-system fixes.
The complete list of the dozens of patches for Btrfs can be found via this pull request.
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