From: Shaohua Li <shli@kernel.org>
Date: Tue, 3 Jul 2012 05:57:19 +0000 (+1000)
Subject: raid5: delayed stripe fix
X-Git-Tag: v3.5-rc6~24^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fab363b5ff502d1b39ddcfec04271f5858d9f26e;p=pandora-kernel.git

raid5: delayed stripe fix

There isn't locking setting STRIPE_DELAYED and STRIPE_PREREAD_ACTIVE bits, but
the two bits have relationship. A delayed stripe can be moved to hold list only
when preread active stripe count is below IO_THRESHOLD. If a stripe has both
the bits set, such stripe will be in delayed list and preread count not 0,
which will make such stripe never leave delayed list.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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