When the permission question mark appears in the sshfs mount, or input / output error occurs

View hard disk usage df-h
view hard disk information: fdisk-l
eg:
sudo sshfs-o allow_other-o reconnect-o cache=yes www@ip:/ destination file/local file
or
sudo sshfs -o allow_other -o nonempty -o reconnect -o cache=yes www@ip:/data/wwwroot/default/test /home/www/test/uploads
If there is a permission question mark :
close hanging in eg: sudo umount./inquiry
And open;
View hanging information: cat /etc/mtab
running SSHFS: ps aux | grep SSHFS

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