-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 04/02/2012 04:25 PM, Lennart Poettering wrote: > On Mon, 02.04.12 20:58, Richard W.M. Jones (rjones@xxxxxxxxxx) wrote: > Heya, > >> 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." > > Well, i'd claim this is not really user visible if implemented correctly. > This is however visible to the developer. > >> tmpfs is different in a number of important ways: >> >> - it's very limited in space compared to a real disk > > Yes, large files need to be placed on /var/tmp, which is explained in the > feature page. > >> - it doesn't support O_DIRECT > > Well, all code using O_DIRECT should probably have a fallback to work > without, anyway, and very likely has. O_DIRECT doesn't really make sense > for tmpfs, it isn't really a feature that currently isn't supported and > could be implemented, it is something that genuinly makes little sense for > tmpfs... > >> - 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 > > We do this change for F18, not for old Fedora with old kernels. SELinux > labels work fine on tmpfs. User xattr patches have recently been posted on > lkml, but indeed are not supported right now. > >> 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. > > But yes, this is absolutely true. We do expect breakages. That's why our > plan is: Turn on early in the F18 cycle. Fix bugs which appear as they show > up. If they are too many, revert to turned off. > > I will post a longer annoucnement of this with suggested fixes to > fedora-devel when we make the upload to turn this on for F18. > > Thanks, > > Lennart > I have been running with a tmpfs /tmp for years, without a problem. I have found the having /tmp be anything else that a tmpfs has caused me pain over the years with mislabeled files or files with the wrong UID. Change to use a confined user or change the UID of a user suddenly X will not allow you to login, reboot does not fix the problem. With tmpfs I get a nice clean /tmp on every boot. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk96EpoACgkQrlYvE4MpobMUogCgzp/w7pc/mNSz06VKQESmhSN6 zbwAn0qqcDjIsg640VnTvUjyZgft+mx5 =YqPb -----END PGP SIGNATURE----- -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
