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From: Jeff Garzik <>
To: Tejun Heo <>
Cc: James Bottomley <>,
	Mark Lord <>, Matthew Wilcox <>,,
Subject: Re: ata_ram driver
Date: Thu, 06 Mar 2008 21:16:45 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Tejun Heo wrote:
> James Bottomley wrote:
>>> Yeap, sure.  It's the combination of things that always made me put this
>>> off.  Is there a function I can call to just shutdown the host instead
>>> of destroying it?
>> Not really ... the process of unbinding the ULDs causes their remove
>> methods to call shudown.  It is possible to separate this in the ULDS;
>> but the original design was to make remove and shutdown be similar for
>> the very reason that if you're removing the driver with unflushed data
>> in the cache, we'd really like it flushed (flush is called from
>> shutdown) because you have no way to talk to the device after this
>> without reinserting the driver.
> The problem is that libata EH and other stuff aren't ready to let go of
> the SCSI host up until the last moment and that last moment can't be
> moved before SCSI host destruction because shutdown sequence (flush and
> spindown) requires live EH.  I think this can be solved by shooting down
> individual sdev's instead of destroying the scsi_host.

I'm curious how the picture would change, if we used a scsi_host for 
each ata_host.


  parent reply	other threads:[~2008-03-07  2:17 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-22 20:09 Matthew Wilcox
2008-02-22 21:27 ` Mark Lord
2008-03-06  8:21   ` Tejun Heo
2008-03-06 15:28     ` James Bottomley
2008-03-06 23:55       ` Tejun Heo
2008-03-07  0:01         ` James Bottomley
2008-03-07  0:13           ` Tejun Heo
2008-03-07  0:22             ` James Bottomley
2008-03-07  0:28               ` Tejun Heo
2008-03-07  0:39                 ` James Bottomley
2008-03-07  0:43                   ` Tejun Heo
2008-03-07  3:08                     ` [PATCH 1/2] scsi: export scsi_forget_host() Tejun Heo
2008-03-07  3:11                       ` [PATCH 2/2] libata: kill SCSI devices before detaching ata_host Tejun Heo
2008-03-07  2:16                 ` Jeff Garzik [this message]
2008-03-07  2:44                   ` ata_ram driver James Bottomley

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