md: fix md_write_start() deadlock w/o metadata devices
If no metadata devices are configured on raid1/4/5/6/10 (e.g. via dm-raid), md_write_start() unconditionally waits for superblocks to be written thus deadlocking. Fix introduces mddev->has_superblocks bool, defines it in md_run() and checks for it in md_write_start() to conditionally avoid waiting. Once on it, check for non-existing superblocks in md_super_write(). Link: https://bugzilla.kernel.org/show_bug.cgi?id=198647 Fixes: cc27b0c7 ("md: fix deadlock between mddev_suspend() and md_write_start()") Signed-off-by: NHeinz Mauelshagen <heinzm@redhat.com> Signed-off-by: NShaohua Li <sh.li@alibaba-inc.com>
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