Re: [PATCH 5/7] SELinux: Handle opening of a unioned file

[David Howells]

Stephen Smalley <sds@xxxxxxxxxxxxx> wrote:

> Not sure what filesystems you have in mind for the unionmount scenario.

Currently any filesystem that can be used for a unionmount top layer has to be
modified to provide certain things (DT_WHITEOUT and DT_FALLTHRU directory
entry creation) - and the way this is done precludes a number of filesystems
from being used (it modifies the on-disk format).

Whiteout creation is being provided by some filesystems for overlayfs - but in
a different way to unionmount (0,0 chardevs rather than DT_WHITEOUT dirents).

David
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