Snapshot automount fails under chroot

[lazy404]

Sep 14 18:31:36 www kernel: WARNING: Unable to automount /.zfs/snapshot/test/wwwpool/lazydev_zfstest@test: 512

wwwpool is mounted under /home/www, the process is chrooted at /home/www/lazydev_zfstest

full_path should be /home/www/lazydev_zfstest/.zfs/snapshot/test but is /.zfs/snapshot/test
https://github.com/zfsonlinux/zfs/blob/master/module/zfs/zfs_ctldir.c#L691
called by
https://github.com/zfsonlinux/zfs/blob/master/module/zfs/zfs_ctldir.c#L1069

using d_absolute_path() fixed the issue but it isn't normally exported

[behlendorf]

@lazy404 as of 0.6.5 we have another way to tackle this. We could use zfsctl_snapshot_path_objset() to construct the full path when the path generated by zfsctl_snapshot_path() fails. This function was added to handle the NFS auto-mount case which is similar to the chroot case. That way we don't need to depend on d_absolute_path() which as you point out isn't always available.

[behlendorf]

@lazy404 are you still observing this with recent 0.6.5.x releases?

[lazy404]

It failed with some earlier 0.6.5.x releases but it was gracefull,
i will check with the last one

[behlendorf]

This issue was resolved in the 0.7 series.