From 4e78064f42ad474ce9c31760861f7fb0cfc22532 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Tue, 19 Oct 2010 12:54:01 +1100 Subject: [PATCH] md: Fix possible deadlock with multiple mempool allocations. It is not safe to allocate from a mempool while holding an item previously allocated from that mempool as that can deadlock when the mempool is close to exhaustion. So don't use a bio list to collect the bios to write to multiple devices in raid1 and raid10. Instead queue each bio as it becomes available so an unplug will activate all previously allocated bios and so a new bio has a chance of being allocated. This means we must set the 'remaining' count to '1' before submitting any requests, then when all are submitted, decrement 'remaining' and possible handle the write completion at that point. Reported-by: Torsten Kaiser Tested-by: Torsten Kaiser Signed-off-by: NeilBrown --- Reading git-format-patch failed