From: Joe Thornber <ejt@redhat.com>
Date: Wed, 28 Mar 2012 17:41:28 +0000 (+0100)
Subject: dm thin: prepare to support discard
X-Git-Tag: v3.4-rc1~68^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eb2aa48d4eb7aee63cba201bf47641dad3e92250;p=pandora-kernel.git

dm thin: prepare to support discard

This patch contains the ground work needed for dm-thin to support discard.

  - Adds endio function that replaces shared_read_endio.

  - Introduce an explicit 'quiesced' flag into the new_mapping structure.
    Before, this was implicitly indicated by m->list being empty.

  - The map_info->ptr remains constant for the duration of a bio's trip
    through the thin target.  Make it easier to reason about it.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

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