On Mon, Oct 27, 2014 at 02:10:47PM -0700, Chris Leech wrote: > Hi, I was hoping someone could help me make sure I'm not overlooking > something with trying to manage mounts on iSCSI disks. > > I have an iscsi.service which starts and stops sessions to iSCSI > targets. It's set with Before=remote-fs-pre.target and > Wants=remote-fs-pre.target to ensure that remote fs ordering is enabled. > Unfortunately mount points only get configured as remote if there is a > record in /etc/fstab at the time fstab-generator is run. > > At boot fstab-generator is picking up on the _netdev option in fstab, > and the generated mount units are ordered against remote-fs properly. > If I leave a filesystem mounted at shutdown, it will be unmounted before > the iSCSI session is destroyed or the network is shut down and > everything works as expected. > > But there are two cases that are problematic, adding entries to fstab at > runtime and manually mounting without adding to fstab (while still using > the _netdev option, some hint is needed). The first case actually ends > up being the second, with the possible work-around of always remembering > to run a daemon-reload after editing fstab to run fstab-generator again. > > If there's no matching mount unit from fstab-generator, one gets created > dynamically when the fs is mounted by monitoring /proc/self/mountinfo. Actually, it is more correct to say that a unit *always* get created based on /proc/self/mountinfo. If there was a unit previously, it is replaced by the new one, but inherits the dependencies. In effect it leads to the behaviour you described.
> So for any mounts to remote block devices (unlike remote file system > protocols which are detected by the fs name), unless there is an fstab > entry at the time fstab-generator is run they get treated like local fs > mounts and connectivity to the storage target may be disrupted before > unmounting (possibly resulting in file system errors). Yes, that seems right. It seems reasonable to change the code which generates units based on /p/s/mounintinfo to behave as if _netdev option was specified, for the known network filesystem types. > I'm currently at a loss for how to handle this, other than to claim that > if filesystems are going to be left mounted they should be added to > fstab and a daemon-reload is required. That is always an option, but I think that in this case a simple patch will be nicer. Zbyszek _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
