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From: "Theodore Ts'o" <tytso@mit.edu>
To: linux-ext4@vger.kernel.org, dm-devel@redhat.com
Subject: Is it deliberate that the device mapper is not passing the DISCARD ioctls
Date: Mon, 20 Sep 2010 09:14:56 -0400	[thread overview]
Message-ID: <E1OxgCu-0000XW-29@tytso-glaptop> (raw)

Hi there,

I was just testing discard support in mke2fs, and I was surprised that
although the dm layer appears to pass discard requests through to the
underlying block device driver when submitted through the bio layer
(i.e., from kernel file systems), apparently the discard ioctls (i.e.,
BLKDISCARD, BLKDISCARDSEC, BLKDISCARDZEROES) are not currently wired up
in the dm layer.

Is this deliberate, or an oversight?

Thanks, regards,

					- Ted

             reply	other threads:[~2010-09-20 13:14 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-20 13:14 Theodore Ts'o [this message]
2010-09-20 17:40 ` Is it deliberate that the device mapper is not passing the DISCARD ioctls Mike Snitzer
2010-09-20 18:55   ` Mike Snitzer
2010-09-21 10:42 ` Lukas Czerner
2010-09-21 19:47   ` Mike Snitzer

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