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SubjectRE: union mount (was Re: Transparent mounts)
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Sorry for bothering the list once again with my humble suggestion but coming
back to ClearCase: why not implement the concept of a view:

1. You specify a set of rules which say which file is seen if there is a
conflict.
2. In the case discussed here you also specify where to write.

On mount these are read by a daemon and the kernel shovels all file I/O to this
daemon into user-space. The daemon goes through 1 and 2 and does the actual
file I/O.

May be rather slow but very flexible. And accomodates for all subcases - union
filesystem, transparrent mounts, versioned filesystems, etc.

Per-user functions can be implemented via preload libraries.

- ----------------------------------
Anton R. Ivanov
IP Engineer Level3 Communications
RIPE: ARI2-RIPE E-Mail: Anton Ivanov <aivanov@eu.level3.net>
@*** First Law of Office Holders ***
Get re-elected.

- ----------------------------------

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