NFS export & error read-only error on client

# For example /etc/export

/mnt/vol01 192.168.1.0/24(ro,sync,no_subtree_check)
/mnt/vol01/dir1 192.168.1.0/24(ro,sync,no_subtree_check)

/mnt/vol01/inet/btorrent 192.168.1.0/24(rw,sync,no_subtree_check,all_squash)
/mnt/vol01/dir1/dir2 torrenthost(rw,sync,no_subtree_check,all_squash)

# mount torrenthost
mount -t nfs nfsserver:/mnt/vol01/inet/btorrent /mnt/share.nfs/btorrent
mount -t nfs nfsserver:/mnt/vol01/dir1/dir2 /mnt/share.nfs/dir2

touch /mnt/share.nfs/dir2/xx --> read-only...;-//

# Change /etc/export
/mnt/vol01 192.168.1.0/24(ro,sync,no_subtree_check,fsid=0)
/mnt/vol01/dir1 192.168.1.0/24(ro,sync,no_subtree_check,fsid=1)

/mnt/vol01/inet/btorrent 192.168.1.0/24(rw,sync,no_subtree_check,all_squash,fsid=2)
/mnt/vol01/dir1/dir2 torrenthost(rw,sync,no_subtree_check,all_squash,fsid=3)

et voilà !!!