Re: [PATCH] configfs: Fix race between create_link and configfs_rmdir

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

On Thu, 2017-06-08 at 07:34 -0500, Bryant G. Ly wrote:
> > Thanks Nic,
> >
> > applied to the configfs-for-next tree.  I'm not entirely sure if we
> > should bother adding this to 4.12 or if it hits rarely enough?
> >
> It hits for us pretty often when we have a GPFS setup with 10 hosts and 1k+ vms.
> 
> That is how we discovered the bug in the first place.
> 

Using a DATERA workload with 1K unique multi-tenant backend devices and
1K unique iscsi-target IQNs per node, I've never tripped across this
particular bug..

However, our userspace built atop rtslib is enforcing tenant shutdown of
individual rmdir(2) of /sys/kernel/config/target/$FABRIC/$WWN/$TPGT/,
before rmdir(2) of /sys/kernel/config/target/core/$HBA/$DEV/ occurs.

Based on Bryant's original backtrace with targetcli, it looks like the
Novalink user-space is not enforcing this requirement across user-space
processes doing fabric port symlink and backend device shutdown.

That said it probably doesn't need a special v4.12-rc PULL, but based on
Bryant's feedback it certainly does deserve a stable CC'.