Messages in this thread | | | Subject | Re: [PATCH 27/38] union-mount: In-kernel file copyup routines | From | Miklos Szeredi <> | Date | Wed, 04 Aug 2010 17:26:28 +0200 |
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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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