btrfs: add btrfs prefix to trace events for extent state alloc and free

These trace events don't have the 'btrfs_' prefix in their name, unlike
the other trace events from extent-io-tree.c. So add the prefix to make
them consistent and follow coding style conventions too.

Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Filipe Manana <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: fdmanana

fs/btrfs/extent-io-tree.c

@@ -159,7 +159,7 @@ static struct extent_state *alloc_extent_state(gfp_t mask)
 	btrfs_leak_debug_add_state(state);
 	refcount_set(&state->refs, 1);
 	init_waitqueue_head(&state->wq);
-	trace_alloc_extent_state(state, mask, _RET_IP_);
+	trace_btrfs_alloc_extent_state(state, mask, _RET_IP_);
 	return state;
 }
 
@@ -178,7 +178,7 @@ void free_extent_state(struct extent_state *state)
 	if (refcount_dec_and_test(&state->refs)) {
 		WARN_ON(extent_state_in_tree(state));
 		btrfs_leak_debug_del_state(state);
-		trace_free_extent_state(state, _RET_IP_);
+		trace_btrfs_free_extent_state(state, _RET_IP_);
 		kmem_cache_free(extent_state_cache, state);
 	}
 }

include/trace/events/btrfs.h

@@ -1476,7 +1476,7 @@ TRACE_EVENT(btrfs_setup_cluster,
 );
 
 struct extent_state;
-TRACE_EVENT(alloc_extent_state,
+TRACE_EVENT(btrfs_alloc_extent_state,
 
 	TP_PROTO(const struct extent_state *state,
 		 gfp_t mask, unsigned long IP),
@@ -1499,7 +1499,7 @@ TRACE_EVENT(alloc_extent_state,
 		  show_gfp_flags(__entry->mask), __entry->ip)
 );
 
-TRACE_EVENT(free_extent_state,
+TRACE_EVENT(btrfs_free_extent_state,
 
 	TP_PROTO(const struct extent_state *state, unsigned long IP),