Re: [PATCH 27/38] union-mount: In-kernel file copyup routines

[Miklos Szeredi]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/