On 04/02/2012 15:58, Richard W.M. Jones wrote:
On Mon, Apr 02, 2012 at 08:32:56PM +0200, Miloslav Trmač wrote:
* #834 F18 Feature: /tmp on tmpfs -
http://fedoraproject.org/wiki/Features/tmp-on-tmpfs (mitr,
17:40:06)
* AGREED: tmp-on-tmpfs is accepted (+5 -3) (mitr, 18:12:52)
Actually I think this is a good feature, but ...
The feature page is wrong about "The user experience should barely
change. This is mostly a low-level change that has little visibility
to the user."
tmpfs is different in a number of important ways:
- it's very limited in space compared to a real disk
- it doesn't support O_DIRECT
- it doesn't support user extended attrs; and not very old kernels
didn't support any xattrs at all, meaning things like SELinux
labels don't work
All this means it's going to need a bit more testing, since
potentially any package that stores a file on /tmp should be tested
and may need to be fixed.
Rich.
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<resend of my message since its going to bounce>
That third part is not correct. tmpfs supports SELinux labels. If you
mount a tmpfs filesystem you'll see it reports seclabel as one of the
mount options. You can also just use chcon -t to set the type on any
file you like. SELinux labels are stored in the security namespace which
is separate from user extended attributes.
Dave
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