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    SubjectRe: [PATCH 01/24] Unionfs: Documentation
    On Mon, Jan 08, 2007 at 01:19:57PM -0800, Andrew Morton wrote:
    ...
    > If it's not in the changelog or the documentation, it doesn't exist.

    Good point. I'll add it for next time.

    > > It's the same thing as modifying a block
    > > device while a file system is using it. Now, when unionfs gets confused,
    > > it shouldn't oops, but would one expect ext3 to allow one to modify its
    > > backing store while its using it?
    >
    > There's no such problem with bind mounts. It's surprising to see such a
    > restriction with union mounts.

    Bind mounts are a purely VFS level construct. Unionfs is, as the name
    implies, a filesystem. Last year at OLS, it seemed that a lot of people
    agreed that unioning is neither purely a fs construct, nor purely a vfs
    construct.

    I'm using Unionfs (and ecryptfs) as guinea pigs to make linux fs stacking
    friendly - a topic to be discussed at LSF in about a month.

    Josef "Jeff" Sipek.

    --
    Computer Science is no more about computers than astronomy is about
    telescopes.
    - Edsger Dijkstra
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