linux-kernel - Re: [PATCH RFC] scsi: wait sd probing in manual scan

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Date:   Wed, 3 May 2017 18:15:02 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "bergwolf@...il.com" <bergwolf@...il.com>
CC:     "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
Subject: Re: [PATCH RFC] scsi: wait sd probing in manual scan

On Fri, 2017-04-28 at 15:48 +0800, Peng Tao wrote:
> We have a guest init programe trying to mount a device after doing scsi host scan
> at boot time. Occasionally it fails to find the device when mounting. After digging
> a bit, it seems the root cause is sd async_schedule probing.
> 
> With async probing, there is no guarantee of device readiness when scsi host
> scan finishes. However, users do expect to have a valid way to make sure device
> is usable. Change scsi scan to wait sd probing in manual scan case so that we
> don't leave user with random device state when scsi host scan returns.
> 
> Is this the right way to have such guarantee?

Hello Peng,

Please fix the guest init program such that it waits until the SCSI device
it needs is ready.

Thanks,

Bart.