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From: Jeff Garzik <jeff@garzik.org>
To: Tejun Heo <htejun@gmail.com>
Cc: Robert Hancock <hancockr@shaw.ca>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-ide@vger.kernel.org, edmudama@gmail.com,
	Nicolas.Mailhot@LaPoste.net
Subject: Re: libata FUA revisited
Date: Fri, 16 Feb 2007 13:14:56 -0500	[thread overview]
Message-ID: <45D5F4A0.4050000@garzik.org> (raw)
In-Reply-To: <45D025CB.6070205@gmail.com>

Tejun Heo wrote:
> Hello,
> 
> Robert Hancock wrote:
> [--correct summary snipped--]
>> Given the above, what I'm proposing to do is:
>>
>> -Remove the blacklisting of Maxtor BANC1G10 firmware for FUA. If we 
>> need to FUA-blacklist any drives this should likely be added to the 
>> existing "horkage" mechanism we now have. However, at this point I 
>> don't think that's needed, considering that I've seen no conclusive 
>> evidence that any drive has ever been established to have broken FUA.
> 
> Agreed.
> 
>> -Add a new port flag ATA_FLAG_NO_FUA to indicate that a controller 
>> can't handle FUA commands, and add that flag to sata_sil. Force FUA 
>> off on any drive connected to a controller with this bit set.
>>
>> There was some talk that sata_mv might have this problem, but I 
>> believe the conclusion was that it didn't. The only controllers that 
>> would are ones that actually try to interpret the ATA command codes 
>> and don't know about WRITE DMA FUA.
> 
> I think it would be better to add ATA_FLAG_FUA instead of ATA_FLAG_NO_FUA.

This is an interesting (if small) problem.  I would propose a third 
option:  add ATA_FLAG_NO_FUA to applicable /SATA/ drivers, but leave 
those without ATA_FLAG_SATA alone.

	Jeff



  reply	other threads:[~2007-02-16 18:15 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-12  3:25 Robert Hancock
2007-02-12  8:31 ` Tejun Heo
2007-02-16 18:14   ` Jeff Garzik [this message]
     [not found] <fa.S80SRyQbD/hm4SxliPUKU88BaCo@ifi.uio.no>
2007-02-12  5:47 ` Robert Hancock
     [not found] ` <fa.Q/csgyCHkAsD84yi+bN78H1WNNM@ifi.uio.no>
2007-02-13  0:23   ` Robert Hancock
2007-02-13 15:20     ` Tejun Heo
2007-02-14  0:07       ` Robert Hancock
2007-02-14  0:50         ` Tejun Heo
2007-02-15 18:00           ` Jens Axboe
2007-02-19 19:46             ` Robert Hancock
2007-02-21  8:37               ` Tejun Heo
2007-02-21  8:46                 ` Jens Axboe
2007-02-21  8:57                   ` Tejun Heo
2007-02-21  9:01                     ` Jens Axboe
2007-02-22 22:44                     ` Ric Wheeler
2007-02-22 22:40                   ` Ric Wheeler
2007-02-21 14:06                 ` Robert Hancock
2007-02-22 22:34                 ` Ric Wheeler
2007-02-23  0:04                   ` Robert Hancock
2007-02-21  8:44               ` Jens Axboe

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