BTRFS_INODE_NO_XATTRS
if (test_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags))
set_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags);
clear_bit(BTRFS_INODE_NO_XATTRS, &BTRFS_I(inode)->runtime_flags);
test_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags);