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FUSE Passthrough Mode Merged For Linux 6.9
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this post was submitted on 15 Mar 2024
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This is the best summary I could come up with:
The FUSE passthrough mode that's been years in the making for better performance was merged upstream today for the in-development Linux 6.9 kernel!
Last month I wrote that FUSE passthrough might land for Linux 6.9 after noticing the patches finally appear in FUSE.git's "for-next" branch.
This feature was indeed sent in as part of the FUSE updates for Linux 6.9 and today Linus Torvalds merged it upstream.
The FUSE merge for Linux 6.9 sums up the feature as: Add passthrough mode for regular file I/O.
This allows performing read and write (also via memory maps) on a backing file without incurring the overhead of roundtrips to userspace.
For now this is only allowed to privileged servers, but this limitation will go away in the future FUSE for Linux 6.9 also fixes up an interaction issue in direct I/O mode with memory maps, exposes file-system tags through sysfs for VirtIOFS, and various other fixes.
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