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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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