On 12/09/17 21:17, Badics, Alex wrote: > Hi, > > We've been trying out autofs with both systemd-automount and the > autofs userspace daemon, and it seems like it incorrectly marks a > mountpoint as "expired" even though it's still in use in a different > mount namespace. Am I doing something wrong? Are mount namespaces > supported by the autofs driver? There are challenges with namespaces that I'm unable to resolve. The specific behavior your seeing is one of those problems. I'm unable to find a way to check propogated mounts. I tried recently and could only come up with a method that was order n squared cost with the number of mounts which was, as you would expect, rejected upstream. And what kernel version are you using? > > Reproduction: > /etc/autofs/auto.master: > /mnt/test /etc/autofs/auto.test.nfs --timeout 10 > > /etc/autofs/auto.test.nfs: > test -rw,soft,intr server.domain:/exports/nfs > > On one tab, I start autofs: > # automount -f -v > > On another, I unshare a namespace, and cd into the test directory: > # cd /mnt > # unshare -m --propagation shared > # cd test/test > > And just wait. The mount correctly happens, but after 10 seconds, the > autofs daemon gets an expired message and tries to umount hte nfs > mount, and fails, because it's busy. It retries until I cd out of the > nfs directory, then it of course succeeds: > > Starting automounter version 5.1.3, master map auto.master > using kernel protocol version 5.02 > mounted indirect on /mnt/test with timeout 10, freq 3 seconds > attempting to mount entry /mnt/test/test > mounted /mnt/test/test > 1 remaining in /mnt/test > 1 remaining in /mnt/test > 1 remaining in /mnt/test > expiring path /mnt/test/test >>> umount.nfs4: /mnt/test/test: device is busy >>> umount.nfs4: /mnt/test/test: device is busy >>> umount.nfs4: /mnt/test/test: device is busy > Unable to update the mtab file, /proc/mounts and /etc/mtab will differ > expired /mnt/test/test > 1 remaining in /mnt/test > 1 remaining in /mnt/test > 1 remaining in /mnt/test > 1 remaining in /mnt/test > expiring path /mnt/test/test > expired /mnt/test/test What is it your trying to do? How would you like this to behave? Keep in mind that a mount namespace is little more than a view of the set of current mounts so there is limited mount independence possible. Ian -- To unsubscribe from this list: send the line "unsubscribe autofs" in
