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add discard support to nbd

From:  Paul Clements <paul.clements@steeleye.com>
To:  kernel list <linux-kernel@vger.kernel.org>
Subject:  [PATCH 0/2] add discard support to nbd
Date:  Tue, 28 Aug 2012 17:42:40 -0400
Message-ID:  <CAECXXi6q_NWpughUkwMCs6XeER-W_pHDz4HhhBGbcAmwBKppjA@mail.gmail.com>
Cc:  andrew morton <akpm@linux-foundation.org>
Archive-link:  Article

This patchset adds discard request support to nbd. This should be good
for inclusion in next.

The first patch adds a set-flags ioctl, allowing various option flags
to be set on an nbd device. One of the new flags tells the nbd client
to send discard requests to the server.
The second patch adds handling of discard requests to nbd when
NBD_FLAG_SEND_TRIM is set.

Thanks,
Paul
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