Re: [PATCH 0/4] notify userspace of offline->running transitions (v2)

[Mike Christie <michaelc@xxxxxxxxxxx>]

On 05/21/2012 06:50 AM, Hannes Reinecke wrote:
> On 05/18/2012 06:56 AM, michaelc@xxxxxxxxxxx wrote:
>> The following patches were made over the misc branch of the scsi tree.
>>
>> The patches fix a issue where if the device is offlined or IO is
>> failed due to fast_io_fail (fc) /recovery_tmo (iscsi) then comes
>> back, apps do not have a way a nice way to figure out the state
>> has transitioned to running. Apps have to either poll the sysfs state
>> file or send a SG IO to figure it out. With the patch apps can listen
>> for the KOBJ CHANGE event like some of them (at least udev does) do
>> already.
>>
>> v2:
>> - Rebased to misc.
>>
> In principle, yes.
> 

ccing Kay.

> However, when doing this, we're now sending 'CHANGE' uevents from
> SCSI devices. With the potential of putting _quite_ some strain on udev.
> Kay explicitely debarred me from using uevents for my SCSI sense

Kay told me to do it this way :) In this case udev was the app we
discovered the issue with, so maybe that is the diff.
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