[Bug 111441] iscsi fails to attach to targets

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=111441

--- Comment #12 from Serguei Bezverkhi <sbezverk@cisco.com> ---
HI Mike,

It is working now, it spits alua related error messages but it attaches remote
and local targets, so my OpenStack is back to life. Please let me know if you
plan to commit this fix upstream.

[   27.579303] scsi 3:0:0:2: Direct-Access     LIO-ORG  san-disk-2       4.0 
PQ: 0 ANSI: 5
[   27.579797] sd 3:0:0:2: alua: supports implicit and explicit TPGS
[   27.579932] sd 3:0:0:2: [sdc] 20507809792 512-byte logical blocks: (10.4
TB/9.54 TiB)
[   27.579975] sd 3:0:0:2: alua: No target port descriptors found
[   27.579977] sd 3:0:0:2: alua: Attach failed (-22)
[   27.580640] sd 3:0:0:2: failed to add device handler: -22
[   27.580897] sd 3:0:0:2: [sdc] Write Protect is off
[   27.580899] sd 3:0:0:2: [sdc] Mode Sense: 43 00 10 08
[   27.580922] sd 3:0:0:2: Attached scsi generic sg3 type 0
[   27.581041] sd 3:0:0:2: [sdc] Write cache: enabled, read cache: enabled,
supports DPO and FUA
[   27.630156] sd 3:0:0:2: [sdc] Attached SCSI disk

Thank you very much

Serguei


Serguei Bezverkhi,
TECHNICAL LEADER.SERVICES
Global SP Services
sbezverk@cisco.com
Phone: +1 416 306 7312
Mobile: +1 514 234 7374

CCIE (R&S,SP,Sec) - #9527

Cisco.com



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-----Original Message-----
From: Mike Christie [mailto:michaelc@cs.wisc.edu] 
Sent: Tuesday, February 02, 2016 3:12 PM
To: Christoph Hellwig <hch@infradead.org>
Cc: Serguei Bezverkhi (sbezverk) <sbezverk@cisco.com>;
bugzilla-daemon@bugzilla.kernel.org; linux-scsi@vger.kernel.org; Hannes
Reinecke <hare@suse.de>
Subject: Re: [Bug 111441] New: iscsi fails to attach to targets

On 02/02/2016 12:09 PM, Christoph Hellwig wrote:
> On Fri, Jan 29, 2016 at 05:32:54PM -0600, Mike Christie wrote:
>> Hey Christoph and Hannes,
>>
>> The dh/alua changes that added this:
>>
>>         error = scsi_dh_add_device(sdev);
>>         if (error) {
>>                 sdev_printk(KERN_INFO, sdev,
>>                                 "failed to add device handler: %d\n", 
>> error);
>>                 return error;
>>         }
>>
>> to scsi_sysfs_add_sdev are adding a regression.
>>
>> 1. If that fails, then we forget to do device_del before doing the 
>> return. My patch in this thread added that back, so we do not see the 
>> sysfs oopses anymore. But.....
> 
> Ok.
> 
>> 2. It looks like in older kernels, we would allow misconfigured 
>> targets like this one to still setup devices. Do we want that old behavior back?
>> Should we just ignore the return value from scsi_dh_add_device above?
>> Note that in this case, it is LIO so it can be easily fixed on the 
>> target side by just setting it up properly. I do not think other 
>> targets would hit this type of issue.
> 
> Be liberal in what you accept..  I guess we need to continue allowing 
> to connect to these broken targets, but a warning would be useful.
> 
> Can you send a patch?

Serguei, can you try the attached patch? Drop the other one I sent.

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