From: NeilBrown Date: Wed, 28 May 2014 03:39:23 +0000 (+1000) Subject: md: always set MD_RECOVERY_INTR when aborting a reshape or other "resync". X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=3991b31ea072b070081ca3bfa860a077eda67de5;p=deliverable%2Flinux.git md: always set MD_RECOVERY_INTR when aborting a reshape or other "resync". If mddev->ro is set, md_to_sync will (correctly) abort. However in that case MD_RECOVERY_INTR isn't set. If a RESHAPE had been requested, then ->finish_reshape() will be called and it will think the reshape was successful even though nothing happened. Normally a resync will not be requested if ->ro is set, but if an array is stopped while a reshape is on-going, then when the array is started, the reshape will be restarted. If the array is also set read-only at this point, the reshape will instantly appear to success, resulting in data corruption. Consequently, this patch is suitable for any -stable kernel. Cc: stable@vger.kernel.org (any) Signed-off-by: NeilBrown --- diff --git a/drivers/md/md.c b/drivers/md/md.c index 237b7e0ddc7a..48a99b75682c 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -7381,8 +7381,10 @@ void md_do_sync(struct md_thread *thread) /* just incase thread restarts... */ if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) return; - if (mddev->ro) /* never try to sync a read-only array */ + if (mddev->ro) {/* never try to sync a read-only array */ + set_bit(MD_RECOVERY_INTR, &mddev->recovery); return; + } if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {