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Why is there no write through unionfs in Linux?

Why is there no write through unionfs in Linux? Feels like a very useful tool to have. Does no one else need this? Have half a mind to write one with an NFS interface. EDIT: Thank you, jaunty. But all of these are device level. Even bcachefs was block device level. It doesn't allow union over a FUSE FS etc. It seems strange to not have it at the filesystem level.

Posted by renewiltord on Aug 29, 2025, 4:19 AM

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Why is there no write through unionfs in Linux?

renewiltordAug 29, 2025, 4:19 AM

Why is there no write through unionfs in Linux? Feels like a very useful tool to have. Does no one else need this? Have half a mind to write one with an NFS interface. EDIT: Thank you, jaunty. But all of these are device level. Even bcachefs was block device level. It doesn't allow union over a FUSE FS etc. It seems strange to not have it at the filesystem level.

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