The patch titled
md: possible fix for unplug problem
has been added to the -mm tree. Its filename is
md-possible-fix-for-unplug-problem.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: md: possible fix for unplug problem
From: NeilBrown <neilb@xxxxxxx>
I have reports of a problem with raid5 which turns out to be because the raid5
device gets stuck in a 'plugged' state. This shouldn't be able to happen as
3msec after it gets plugged it should get unplugged. However it happens
none-the-less. This patch fixes the problem and is a reasonable thing to do,
though it might hurt performance slightly in some cases.
Until I can find the real problem, we should probably have this workaround in
place.
Signed-off-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/md/raid5.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN drivers/md/raid5.c~md-possible-fix-for-unplug-problem drivers/md/raid5.c
--- a/drivers/md/raid5.c~md-possible-fix-for-unplug-problem
+++ a/drivers/md/raid5.c
@@ -271,7 +271,7 @@ static struct stripe_head *get_active_st
< (conf->max_nr_stripes *3/4)
|| !conf->inactive_blocked),
conf->device_lock,
- unplug_slaves(conf->mddev)
+ raid5_unplug_device(conf->mddev->queue)
);
conf->inactive_blocked = 0;
} else
_
Patches currently in -mm which might be from neilb@xxxxxxx are
origin.patch
generic_file_buffered_write-deadlock-on-vectored-write.patch
md-possible-fix-for-unplug-problem.patch
md-set-desc_nr-correctly-for-version-1-superblocks.patch
md-delay-starting-md-threads-until-array-is-completely-setup.patch
md-fix-resync-speed-calculation-for-restarted-resyncs.patch
md-fix-a-plug-unplug-race-in-raid5.patch
md-fix-some-small-races-in-bitmap-plugging-in-raid5.patch
md-fix-usage-of-wrong-variable-in-raid1.patch
md-unify-usage-of-symbolic-names-for-perms.patch
md-require-cap_sys_admin-for-re-configuring-md-devices-via-sysfs.patch
md-fix-will-configure-message-when-interpreting-md=-kernel-parameter.patch
md-include-sector-number-in-messages-about-corrected-read-errors.patch
md-dm-reduce-stack-usage-with-stacked-block-devices.patch
lockdep-annotate-sunrpc-code.patch
-
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