"Fake" Write Support
In a series of seven patches, Arnd Bergmann proposed adding in-memory write support to mounted cramfs file systems. He explained, "the intention is to use it for instance on read-only root file systems like CD-ROM, or on compressed initrd images. In either case, no data is written back to the medium, but remains in the page/inode/dentry cache, like ramfs does."
Reactions were mixed. When Arnd suggested this as an alternative to using the more complex unionfs to overlay a temporary filesystem over a read-only file system, and that similar support could be added to other file systems, it was pointed out that there was ultimately more gained by focusing on a single solution that worked with all filesystems. David Newall stressed, "multiple implementations is a recipe for bugs and feature mismatch." Erez Zadok suggested, "I favor a more generic approach, one that will work with the vast majority of file systems that people use w/ unioning, preferably all of them." He went on to add that more gains would be had from modifying the union destination filesystem rather than multiple source filesystems.
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