FT_FIFO 5941 fs/btrfs/inode.c BUILD_BUG_ON(BTRFS_FT_FIFO != FT_FIFO); FT_FIFO 14 fs/fs_types.c [FT_FIFO] = DT_FIFO, FT_FIFO 56 fs/fs_types.c [DT_FIFO] = FT_FIFO,