btrfs: state information for readahead

[deliverable/linux.git] / fs / btrfs / volumes.c

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f2a4cc79da61da62740d1de33552037f27b072a2..1dccce5bc93d0548c90a77f358dfb6842f95725e 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -366,6 +366,14 @@ static noinline int device_list_add(const char *path,
                }
                INIT_LIST_HEAD(&device->dev_alloc_list);
 
+               /* init readahead state */
+               spin_lock_init(&device->reada_lock);
+               device->reada_curr_zone = NULL;
+               atomic_set(&device->reada_in_flight, 0);
+               device->reada_next = 0;
+               INIT_RADIX_TREE(&device->reada_zones, GFP_NOFS & ~__GFP_WAIT);
+               INIT_RADIX_TREE(&device->reada_extents, GFP_NOFS & ~__GFP_WAIT);
+
                mutex_lock(&fs_devices->device_list_mutex);
                list_add_rcu(&device->dev_list, &fs_devices->devices);
                mutex_unlock(&fs_devices->device_list_mutex);