From: Mikulas Patocka <mpatocka@redhat.com>
Date: Mon, 21 Jul 2008 11:00:32 +0000 (+0100)
Subject: dm snapshot: track snapshot reads
X-Git-Tag: v2.6.27-rc1~956^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd45daffd1f7b53aac0835b23e97f814ec3f10dc;p=pandora-kernel.git

dm snapshot: track snapshot reads

Whenever a snapshot read gets mapped through to the origin, track it in
a per-snapshot hash table indexed by chunk number, using memory allocated
from a new per-snapshot mempool.

We need to track these reads to avoid race conditions which will be fixed
by patches that follow.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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