A few patches addressing various disconnect issues in iser.
The first one is related to the administrative disconnect.
To check this scenario one can try to remove a target with
some connections on it, running live io.
For example:
# tgtadm --lld iser --mode target --op show
Target 1: tgt1.iser
System information:
Driver: iser
State: ready
I_T nexus information:
I_T nexus: 15
Initiator: iqn.1994-05.com.redhat:da54c698968
Connection: 0
RDMA IP Address: 192.168.20.16
LUN information:
LUN: 0
...
LUN: 1
...
ACL information:
ALL
The following commands:
unbind initiators, close active connections, remove LUNs, remove target.
# tgtadm --lld iser --mode target --op unbind --tid 1 -I ALL
# tgtadm --lld iser --mode conn --op delete --tid 1 --sid 15 --cid 0
# tgtadm --lld iser --mode logicalunit --op delete --tid 1 --lun 1
# tgtadm --lld iser --mode target --op delete --tid 1
If something goes wrong, problems (from segfault to graceful failures) may
arise after each operation. Note that connection removal is completed
asynchronously to tgtadm requests. Thus the subsequent attempts to remove
a lun may fail few times until the removal succeeds (only if disconnecting
during io).
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