From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 12 Sep 2013 22:06:12 +0000 (-0400)
Subject: dm: add reserved_rq_based_ios module parameter
X-Git-Tag: v3.12-rc3~25^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f47908269fb53d522a956b78612a0037f5faf8e7;p=pandora-kernel.git

dm: add reserved_rq_based_ios module parameter

Allow user to change the number of IOs that are reserved by
request-based DM's mempools by writing to this file:
/sys/module/dm_mod/parameters/reserved_rq_based_ios

The default value is RESERVED_REQUEST_BASED_IOS (256).  The maximum
allowed value is RESERVED_MAX_IOS (1024).

Export dm_get_reserved_rq_based_ios() for use by DM targets and core
code.  Switch to sizing dm-mpath's mempool using DM core's configurable
'reserved_rq_based_ios'.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Frank Mayhar <fmayhar@google.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
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