From: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Date: Sat, 6 Mar 2010 02:30:02 +0000 (+0000)
Subject: dm mpath: hold io until all pg_inits completed
X-Git-Tag: v2.6.34-rc1~24^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0259bf0eefc503d3c9c9ccda35033c3dd3aac30;p=pandora-kernel.git

dm mpath: hold io until all pg_inits completed

m->queue_io is set to block processing I/Os, and it needs to be kept
while pg-init, which issues multiple path activations, is in progress.
But m->queue is cleared when a path activation completes without error
in pg_init_done(), even while other path activations are in progress.
That may cause undesired -EIO on paths which are not complete activation.

This patch fixes that by not clearing m->queue_io until all path
activations complete.

(Before the hardware handlers were moved into the SCSI layer, pg_init
only used one path.)

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

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