Btrfs: alloc_mutex latency reduction
This releases the alloc_mutex in a few places that hold it for over long
operations. btrfs_lookup_block_group is changed so that it doesn't need
the mutex at all.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index eeb5afa..90504ba 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -483,6 +483,7 @@
struct btrfs_key key;
struct btrfs_block_group_item item;
struct btrfs_space_info *space_info;
+ spinlock_t lock;
u64 pinned;
u64 flags;
int cached;
