Messages in this thread |  | | | Date | Fri, 13 May 2005 22:18:15 +0200 | | From | Markus Klotzbuecher <> | | Subject | Re: [ANNOUNCE] mini_fo-0.6.0 overlay file system |
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On Thu, May 12, 2005 at 11:18:36PM -0400, Kyle Moffett wrote:
> 2) When forced to copy data, the copy should be done in the context of > whatever process is doing the "write" operation, and be interruptible, > etc. The end result is that if you union an nfs mount over another one, > it will just seem like a write to a big file takes a _really_ long time > to complete.
This is what happens with mini_fo, provided your kernel is preemptive.
> 3) ext2/3 should get an extra flag for files and directories that > indicates nonresidence. This would be used by the VFS union layer to [...]
I like the idea of copying modified data on a per block basis. This really would avoid unnecessary long copy operations and potentially save a lot of storage. But I think a unifying layer should not rely on specialities such as sparse files or flags provided by the lower layer file systems.
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