From: NeilBrown <neilb@suse.de>
Date: Tue, 3 Oct 2006 08:15:54 +0000 (-0700)
Subject: [PATCH] md: define ->congested_fn for raid1, raid10, and multipath
X-Git-Tag: v2.6.19-rc1~241
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d12922823408b26f83b15cae4a4feff4bd22f28;p=pandora-kernel.git

[PATCH] md: define ->congested_fn for raid1, raid10, and multipath

raid1, raid10 and multipath don't report their 'congested' status through
bdi_*_congested, but should.

This patch adds the appropriate functions which just check the 'congested'
status of all active members (with appropriate locking).

raid1 read_balance should be modified to prefer devices where
bdi_read_congested returns false.  Then we could use the '&' branch rather
than the '|' branch.  However that should would need some benchmarking first
to make sure it is actually a good idea.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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