Hello Umut, Umut Tezduyar Lindskog [2015-05-19 8:23 +0200]: > On Mon, May 18, 2015 at 11:02 PM, Lennart Poettering <lenn...@poettering.net> > wrote: > > The "tentative" state is nothing the system should continously leave > > devices in. It's a state only used for very short time windows, before > > udev is up, or when a pseudo device (like a loopback block device) is > > created and immediately mounted. If you have booted up and see a > > device in "tentative" state, then something is really *wrong*.
Note that it's a permanent state in containers where you don't actually have udev. My very first patch avoided creating these device units at all, to simplify state handling; but Lennart nack'ed this as we want devices/mounts to exist uniformly on real iron and containers, which is certainly a valid point. So if we need the .devices at all, they need to be "tentative", as they can't be "plugged" (not present in the container /dev) nor "dead" (as that would immediately unmount everything). > - Isn't there a race in that "short time window" that if one tries to > unmount stuff, things might go south! Correct, or a permanent situation in containers (with writable /sys at least, as a r/o sys is handled in a special case). Note that I just sent an updated patch for this: http://lists.freedesktop.org/archives/systemd-devel/2015-May/032030.html Would be nice if you could give it a try. > - Seems like poky is enabling udev rules for DM. Maybe we should add > required switches on README file to make DM work. So far I found > CONFIG_DM_UEVENT on kernel and some switches on lvm, > --enable-udev_sync, --enable-udev_rules, --with-udev-prefix=. That's still a preferable fix for non-containers of course. Thanks, Martin -- Martin Pitt | http://www.piware.de Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org)
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