Messages in this thread | | | From | "Lou Grinzo" <> | Subject | FS Unions | Date | Mon, 14 Jun 1999 09:04:12 -0400 |
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The recent talk about fs unions (mounting more than one set of files at the same mount point and merging the dir. contents) is certainly intriguing.
Would the feature be limited to two mounts per point? Would it only allow mounts from the same drive, same partition, same locale (meaning local vs. networked), or from any valid drives?
How would file creations be handled (assuming all unioned file space is R/W)? I imagine there would have to be some very specific rules governing this, e.g. the first mount is considered the "primary" one and gets all file creations, barring any override from the user/programmer. (And no, I haven't considered exactly how such an override should be done.) Or does the location with the most free space get the new file? Or would file creations be prevented entirely? (That would certainly clean things up for the implementation, but it could create severe usability problems, so is probably not feasible.)
To create a fully-realized implementation, would there have to be modifications to commands or facilities to take into account or exploit the fs unions? If so, this might be a way for some others to contribute to the effort and produce a better integration of the feature into the Linux environment.
Lou
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