Hi, everyone

I found btrfs will hangup when we run the sync command on my
x86_64 box. 

The reproduce steps is following:
# mkfs.btrfs -s 8192 -l 8192 -n 8192 /dev/sda1
# mount /dev/sda1 /mnt
# echo 1234567 > /mnt/aaa
# sync
(btrfs hangs up)

It seems that the btrfs doesn't support the sectorsize which is
greater than the page size just like ext2/3/4, though we can use
mkfs.btrfs to make a filesystem with a big sectorsize. Am I right?

If yes, we must do more check in the mkfs.btrfs.

Miao Xie
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