From 1cc127b5d1b71453091859301de4a7dd6ee96fa8 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Thu, 12 Jun 2008 14:46:17 -0400 Subject: Btrfs: Add a thread pool just for submit_bio If a bio submission is after a lock holder waiting for the bio on the work queue, it is possible to deadlock. Move the bios into their own pool. Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/btrfs/ctree.h') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 181c81d29897..dcea9d706d9b 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -529,9 +529,13 @@ struct btrfs_fs_info { * can run with FS locks held, and the writers may be waiting for * those locks. We don't want ordering in the pending list to cause * deadlocks, and so the two are serviced separately. + * + * A third pool does submit_bio to avoid deadlocking with the other + * two */ struct btrfs_workers workers; struct btrfs_workers endio_workers; + struct btrfs_workers submit_workers; int thread_pool_size; #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) -- cgit v1.2.3