NFS R/W 挂载和权限

NFS R/W 挂载和权限
sudo mount -t nfs 192.168.0.49:/mnt/HD_a2 /mnt/nas

sudo chmod -R 777 /mnt/nas/Family/Photos/iphone_08-2014

chmod: changing permissions of '/mnt/nas/Family/Photos/iphone_08-2014/._IMG_0602.JPG': Read-only file system
chmod: changing permissions of '/mnt/nas/Family/Photos/iphone_08-2014/IMG_0162.jpg': Read-only file system
chmod: changing permissions of '/mnt/nas/Family/Photos/iphone_08-2014/._IMG_0689.JPG': Read-only file system 

➜ sudo ls -la /mnt/nas/Family/Photos/iphone_08-2014/IMG_0162.jpg 
-rw-r--r-- 1 501 501 131933 Sep  2  2014 /mnt/nas/Family/Photos/iphone_08-2014/IMG_0162.jpg  

➜ mount -v | grep nas
48:192.168.0.49:/mnt/HD_a2 on /mnt/nas type nfs (rw,relatime,vers=3,rsize=16384,wsize=16384,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.0.49,mountvers=3,mountport=32771,mountproto=udp,local_lock=none,addr=192.168.0.49) 

如你所见,安装座有RW列出了权限,但我无法更改权限

有什么想法如何修复吗?

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