Porting the block-iscsi hotplug script

[Roger Pau Monné]

El 1/3/16 a les 13:57, Gustau Pérez ha escrit:
> 
> 
> El 1/03/16 a les 13:54, Gustau Pérez ha escrit:
>>
>> El 1/03/16 a les 13:15, Roger Pau Monné ha escrit:
>>>>    I tried deleting the xen-tools package and then deleting
>>>> /var/db/xen*. After that I rebooted (there was two xenstore processes,
>>>> I'd say one is the kernel side process and the other the user space
>>>> process, whose binary is installed by the xen-tools port). Finally I
>>>> installed the xen-tools. But the error remains. The error can be found
>>>> at [1].
>>> Hm, this is weird. First things first, you should only have one
>>> xenstored process running in Dom0, so when doing a ps aux you should see:
>>>
>>> root   675   0.0  0.1 23100 2548   -  I    12:21     0:00.69
>>> /usr/local/sbin/xenstored --pid-file...
>>    This is the output of `ps axuw|grep xenstored|grep -v grep`:
>>
>>        root    4549   0,0  0,1  12772  3124   -  I    10:53     0:00,20
>> /usr/local/sbin/xenstored --pid-file /var/run/xenstored.pid
>>
>>> But only one of those lines, if you have more than one, something is
>>> clearly wrong. Can you check if you maybe have duplicated init scripts
>>> in /etc/rc.d and /usr/local/etc/rc.d?
>>>
>>> Then, can you paste the output of `xenstore-ls -fp` before creating the
>>> domain that's giving you the error? If you can paste the config file of
>>> the domain that might also help tracking this down.
>>    Sure, [1] is the output of the xenstore-ls -fp and [2] is the config
>> of the domain. Also, the block script [3] is so simple that it does nothing.
>    Hi Roger,
> 
>    strike my last, don't know why but now it does not complain. I can't
> explain why.
> 
>    Thank you and sorry for the noise,

OK, no problem.

I wouldn't be surprised if there are certain sequences of events that
can leave blkback in a deadlocked state. I've tried fixing them, but the
disconnection and error paths should be simplified, now it's too messy
to understand.

Also, make sure your hotplug script writes the "physical-device" node,
or else blkback is not going to attach the disk.

Roger.