From 25156198235325805cd7295ed694509fd6e3a29e Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Tue, 4 Mar 2008 14:29:32 -0800 Subject: [PATCH] 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/md.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/md.c b/drivers/md/md.c index a71241c5ae72..a986845ea0c3 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -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) { -- 2.20.1