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UBIFS Supports OverlayFS In Linux 4.9, Readying UBI For MLC Support

First up, for those running UBIFS on raw flash memory, there is now OverlayFS support. OverlayFS, as a reminder, provides a union mount for other file-systems. O_TMPFILE, RENAME_WHITEOUT/EXCHANGE are now supported by UBIFS for handling OverlayFS

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