linux-kernel - Re: Background scan of sata drives

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Message-ID: <45461B59.2060607@cfl.rr.com>
Date:	Mon, 30 Oct 2006 10:33:45 -0500
From:	Phillip Susi <psusi@....rr.com>
To:	Tejun Heo <htejun@...il.com>
CC:	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: Background scan of sata drives

I could have sworn I saw a patch in the last month or two that made the 
modprobe scan NON blocking, and added a new dummy module you could 
modprobe that would block until the scan was complete.  Am I imagining this?

Tejun Heo wrote:
> Phillip Susi wrote:
>> I seem to recall seeing mention flow by on the lkml at some point that 
>> sata disks are now scanned in the background rather than blocking in 
>> the modprobe, but that there is a new dummy module you can load that 
>> just blocks until all drives have been scanned.  I tried but was 
>> unable to find the thread that mentioned this, so does anyone know 
>> what that module was?
> 
> Scanning during boot and module loading is blocking.  modprobe will wait 
> in the kernel until the initial scan is complete.  But user initiated 
> scan (echo - - - > /sys/class/scsi_host/hostX/scan) doesn't wait for 
> completion.  Patch to make user scan blocking is pending.
> 

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