No (but can be provided at the block device level)
Other
Supported operating systems
Linux, FreeBSD and NetBSD
Unionfs is a filesystem service for Linux, FreeBSD and NetBSD which implements a union mount for other file systems. It allows files and directories of separate file systems, known as branches, to be transparently overlaid, forming a single coherent file system. Contents of directories which have the same path within the merged branches will be seen together in a single merged directory, within the new, virtual filesystem.
When mounting branches, the priority of one branch over the other is specified. So when both branches contain a file with the same name, one gets priority over the other.
The different branches may be either read-only or read/write file systems, so that writes to the virtual, merged copy are directed to a specific real file system. This allows a file system to appear as writable, but without actually allowing writes to change the file system, also known as copy-on-write. This may be desirable when the media is physically read-only, such as in the case of Live CDs.
Unionfs was originally developed by Erez Zadok and his team at Stony Brook University.[1][2][3]
^Wright, Charles P.; Zadok, Erez (December 2004). "Kernel Korner: Unionfs: Bringing Filesystems Together". Linux Journal. 2004 (128): 8. ISSN 1075-3583.
^"Git server of File systems and Storage Lab". Stony Brook University. Archived from the original on 17 June 2016. Retrieved 17 July 2017. Project: unionfs-3.9.y.git; Owner: Erez Zadok
^"File systems and Storage Lab: CS Department". Stony Brook University. Lab Coordinator and Principal Investigator: Prof. Erez Zadok
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