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    SubjectRe: [PATCH 27/38] union-mount: In-kernel file copyup routines
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    On Tue, 15 Jun 2010, Valerie Aurora wrote:
    > When a file on the read-only layer of a union mount is altered, it
    > must be copied up to the topmost read-write layer. This patch creates
    > union_copyup() and its supporting routines.
    >
    > Thanks to Valdis Kletnieks for a bug fix.

    What happens if there's a crash in the middle of the copyup?

    Possible solution is using rename to atomically "replace" the
    underlying file. That however introduces namespace issues: where to
    put the temporary file which then needs to be deleted on "fsck.union"?

    Miklos


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