From: NeilBrown <neilb@suse.com>
Date: Thu, 24 Sep 2015 04:00:51 +0000 (+1000)
Subject: md: wait for pending superblock updates before switching to read-only
X-Git-Tag: omap-for-v4.4/cleanup-pt1~7^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88724bfa68be792c1487d759e87568c36ac1a1cc;p=pandora-kernel.git

md: wait for pending superblock updates before switching to read-only

If a superblock update is pending, wait for it to complete before
letting md_set_readonly() switch to readonly.
Otherwise we might lose important information about a device having
failed.

For external arrays, waiting for superblock updates can wait on
user-space, so in that case, just return an error.

Reported-and-tested-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
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