:/home/xx# e2fsck -f /dev/sda1
e2fsck 1.40-WIP (14-Nov-2006)
Filesystem does not have resize_inode enabled, but s_reserved_gdt_blocks
is 968; should be zero.  Fix<y>? cancelled!

Resize_inode not enabled, but the resize inode is non-zero.  Clear<y>? cancelled!

:/home/xx# tune2fs -O^dir_index /dev/sda
:/home/xx# debugfs -w /dev/sda1 -R "features +resize_inode"
debugfs 1.40-WIP (14-Nov-2006)
Filesystem features: resize_inode filetype sparse_super large_file
:/home/xx# e2fsck -f /dev/sda1
e2fsck 1.40-WIP (14-Nov-2006)
Pass 1: Checking inodes, blocks, and sizes