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authorTomáš Hodek <tomas.hodek@volny.cz>2015-02-23 11:00:38 +1100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-06 14:40:53 -0800
commitb581e762b1a452ac94d452117a6c953f4d011767 (patch)
treebfaa0d05b640d08e5501854e69cbb0ba2cc799e5 /sound/isa/wss
parent58f0e96a4358f164f3857ee0d609d1b75a3ccf7d (diff)
downloadlinux-linaro-stable-b581e762b1a452ac94d452117a6c953f4d011767.tar.gz
md/raid1: fix read balance when a drive is write-mostly.
commit d1901ef099c38afd11add4cfb3312c02ef21ec4a upstream. When a drive is marked write-mostly it should only be the target of reads if there is no other option. This behaviour was broken by commit 9dedf60313fa4dddfd5b9b226a0ef12a512bf9dc md/raid1: read balance chooses idlest disk for SSD which causes a write-mostly device to be *preferred* is some cases. Restore correct behaviour by checking and setting best_dist_disk and best_pending_disk rather than best_disk. We only need to test one of these as they are both changed from -1 or >=0 at the same time. As we leave min_pending and best_dist unchanged, any non-write-mostly device will appear better than the write-mostly device. Reported-by: Tomáš Hodek <tomas.hodek@volny.cz> Reported-by: Dark Penguin <darkpenguin@yandex.ru> Signed-off-by: NeilBrown <neilb@suse.de> Link: http://marc.info/?l=linux-raid&m=135982797322422 Fixes: 9dedf60313fa4dddfd5b9b226a0ef12a512bf9dc Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/isa/wss')
0 files changed, 0 insertions, 0 deletions