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md: make sure a reshape is started when device switches to read-write 

A resync/reshape/recovery thread will refuse to progress when the array is
marked read-only.  So whenever it mark it not read-only, it is important to
wake up thread resync thread.  There is one place we didn't do this.

The problem manifests if the start_ro module parameters is set, and a raid5
array that is in the middle of a reshape (restripe) is started.  The array
will initially be semi-read-only (meaning it acts like it is readonly until
the first write).  So the reshape will not proceed.

On the first write, the array will become read-write, but the reshape will not
be started, and there is no event which will ever restart that thread.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
NeilBrown 2008-03-04 14:29:32 -08:00 committed by Linus Torvalds
parent d0fae18f1b
commit 2515619823
1 changed files with 1 additions and 0 deletions
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1
drivers/md/md.c
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@ -5356,6 +5356,7 @@ void md_write_start(mddev_t *mddev, struct bio *bi)
mddev->ro = 0;
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
}
atomic_inc(&mddev->writes_pending);
if (mddev->in_sync) {