On Thu, Mar 06, 2008 at 09:15:25AM -0500, Robert P. J. Day wrote:
> 1) each filesystem i use as part of my UML session can have its own
> COW file, right? as in:
>
> ... ubda=root.cow,root.img ubdc=usr.cow,usr.img ... etc etc ...
Yup.
> 2) once i establish a COW file for a given backing file, i can use
> "chmod" to protect that backing file from inadvertant changes, yes?
> that seems to be the case based on my testing.
Yup. UML will also open it read-only (and take a read lock on it) to
protect from accidental change.
> 3) is there a way to "examine" the contents of a COW file? i'm
> reminded of the "minifo" (file overlay) filesystem -- is there a way
> to peek inside a COW file to see some sort of file-based "diff"
> against the backing file?
COW files are block-based, so no.
> 4) is there a way to re-synchronize a COW file against a changed
> backing file?
No.
Jeff
--
Work email - jdike at linux dot intel dot com
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