Re: [PATCH 0/6] overlay filesystem prototype

[J. R. Okajima]

Miklos Szeredi:
> Changes since the last version:
	:::
>  - get write ref on the upper layer on mount unless the overlay
>    itself is mounted read-only

I think it a good approach.
Although it may be harmless, write-ref will not be put when a user
executes,
- mount -o ro /overlay
- umount /overlay
It will be easy to fix by implementing s_op->remount().


>  - raise capabilities for copy up, dealing with whiteouts and opaque
>    directories.  Now the overlay works for non-root users as well

Interesting approach.
But is it safe? If multi-threaded ap or a signal handler share
the credential, then they may gain incorrect capability.


J. R. Okajima
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