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From: Mark Lord <lkml@rtr.ca>
To: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: Linux Kernel Development <linux-kernel@vger.kernel.org>,
	linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: HDIO_DRIVE_CMD and hdparm
Date: Thu, 10 May 2007 09:20:18 -0400	[thread overview]
Message-ID: <46431C12.1030207@rtr.ca> (raw)
In-Reply-To: <Pine.LNX.4.62.0705101327170.759@pademelon.sonytel.be>

Geert Uytterhoeven wrote:
> 	Hi,
> 
> `hdparm -t' uses HDIO_DRIVE_CMD(null) to flush the disk's buffer.

More correctly, that command is supposed to act like an I/O queue "barrier"
operation, not returning from the syscall until everything queued in front
of it has been issued/completed.

I believe that only the original IDE driver actually implements it, though.
And hdparm-7.4 (not released yet) will no longer complain about ENOTTY.

Note that current versions of hdparm use SG_IO/ATA_16 (SAT) for nearly everything
now, only falling back to the older ioctl's for drivers which reject the SAT attempt.

I'd love to find a USB drive enclosure that supports SAT.
Anyone know of one?

And does the USB storage layer actually pass the ATA_16 packets to the device?

Cheers

      parent reply	other threads:[~2007-05-10 13:20 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-10 12:12 HDIO_DRIVE_CMD and hdparm Geert Uytterhoeven
2007-05-10 12:41 ` Christoph Hellwig
2007-05-10 12:51 ` Alan Cox
2007-05-10 13:13   ` Mark Lord
2007-05-10 13:20 ` Mark Lord [this message]

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