Btrfs: Create a work queue for bio writes

This allows checksumming to happen in parallel among many cpus, and
keeps us from bogging down pdflush with the checksumming code.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a22edcf49174..ff15b8513f90 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -514,8 +514,11 @@ struct btrfs_fs_info {
         struct list_head hashers;
         struct list_head dead_roots;
         struct list_head end_io_work_list;
+        struct list_head async_submit_work_list;
         struct work_struct end_io_work;
+        struct work_struct async_submit_work;
         spinlock_t end_io_work_lock;
+        spinlock_t async_submit_work_lock;
 
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
         struct work_struct trans_work;