In computer operating systems, union mounting is a way of combining multiple directories into one that appears to contain their combined contents.[1] Union mounting is supported in Linux, BSD and several of its successors, and Plan 9, with similar but subtly different behavior.
As an example application of union mounting, consider the need to update the information contained on a CD-ROM or DVD. While a CD-ROM is not writable, one can overlay the CD's mount point with a writable directory in a union mount. Then, updating files in the union directory will cause them to end up in the writable directory, giving the illusion that the CD-ROM's contents have been updated.[1][2]
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systems, unionmounting is a way of combining multiple directories into one that appears to contain their combined contents. Unionmounting is supported...
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OverlayFS is a unionmount filesystem implementation for Linux. It combines multiple different underlying mount points into one, resulting in single directory...
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regressed around btrfs-progs version 4.0, rewritten from scratch in 4.6. Unionmounting of read-only storage, known as file system seeding (read-only storage...
9's union directory architecture inspired 4.4BSD and Linux union file system implementations, although the developers of the BSD unionmounting facility...
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