ext4: translate flag bits to strings in tracepoints

Translate the bitfields used in various flags argument to strings to
make the tracepoint output more human-readable.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/extents.c

@@ -4380,7 +4380,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 	}
 
 out3:
-	trace_ext4_ext_map_blocks_exit(inode, map, err ? err : allocated);
+	trace_ext4_ext_map_blocks_exit(inode, flags, map, err ? err : allocated);
 
 	return err ? err : allocated;
 }

fs/ext4/indirect.c

@@ -624,7 +624,7 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
 		partial--;
 	}
 out:
-	trace_ext4_ind_map_blocks_exit(inode, map, err);
+	trace_ext4_ind_map_blocks_exit(inode, flags, map, err);
 	return err;
 }