本文主要是介绍ralink APSOC NFS功能的添加步骤，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
http://blog.chinaunix.net/space.php?uid=25100840&do=blog&id=1744971
一、首先添加模块
# make menuconfig
Kernel/Library/Defaults Selection --->
[*] Customize Kernel Settings
Networking --->
Networking options --->
[*] IP: kernel level autoconfiguration
File systems --->
Network File Systems --->
<*> NFS file system support
[*] Provide NFSv3 client support
[*] Provide client support for the NFSv3 ACL protocol extension
[*] Provide NFSv4 client support (EXPERIMENTAL)
[*] Allow direct I/O on NFS files
Kernel/Library/Defaults Selection --->
[*] Customize Busybox Settings
Linux System Utilities --->
[*] mount
[*] Support mounting NFS file systems
二、以上都添加完之后，运行make dep 和 make ，查看是否添加模块正确，若有一下错误则需做如下修改
# make menuconfig
Kernel/Library/Defaults Selection --->
[*] Customize Kernel Settings
Cryptographic options --->
<*> ECB support
<*> PCBC support
WARNING: "crypto_unregister_template" [crypto/pcbc.ko] undefined!
WARNING: "crypto_register_template" [crypto/pcbc.ko] undefined!
WARNING: "crypto_drop_spawn" [crypto/pcbc.ko] undefined!
三、在确保以上步骤都正确无误后，测试是否能挂载
mount -t nfs -o nolock,rw,tcp,nfsvers=3 10.10.10.3:/root/sharedfs /mnt
（1）若出现错误：failed: RPC Error: Program not registered
重启RPC服务器：
错误原因是home主机上nfs服务被中断，重新开启home的nfs服务然后在客户端重新执行mount命令即可
service nfs restart 或 /etc/rc.d/init.d/nfs restart
（2）若出现错误： mount.nfs: access denied by server while mounting 192.168.5.139:/home/howard 则需要将你的虚拟机做一下配置：
① 首先在vim /etc/exports中 /root/sharedfs *(rw,sync,no_root_squash) 然后保存退出。
/root/sharedfs 就表示共享目录，前面三位是你主机的ip地址, rw：读/写权限，只读权限的参数为ro；
sync：数据同步写入内存和硬盘，也可以使用async，此时数据会先暂存于内存中，而不立即写入硬盘。 no_root_squash：NFS 服务器共享目录用户的属性，如果用户是 root，那么对于这个共享目录来说就具有 root 的权限。
② 然后启动端口映射： # /etc/rc.d/init.d/portmap start（如果说找不到，就执行 #/etc/init.d/portmap start） 如果这一步不成功，最后也连接不上了。
启动NFS 服务： # /etc/rc.d/init.d/nfs start（又找不到，执行 # /etc/init.d/nfs start或＃ /etc/init.d/nfs-kernel-server start）
这两项执行成功 的话，就会显示［ok］
③ 最后再执行：mount -t nfs -o nolock,rw,tcp,nfsvers=3 10.10.10.3:/root/sharedfs /mnt
最后执行：#ls /mnt
#mount
则会显示以下挂载信息：
192.168.5.139:/home/howard/Howard/ on /mnt type nfs (rw,addr=192.168.5.139)
四、测试NFS
① 将编译好的内核通过tftp刷到板子上进行NFS测试
② 在主机上启动NFS服务：service nfs start(restart)
关闭防火墙：service iptables stop
③ cavium机器执行：
#mount -o nolock 192.168.5.139:/home/howard/Howard /mnt
④ 在主机的/home/howard/Howard目录下建一文件：例 yangxuan.txt
⑤ 在 cavium机下进入主机的/home/howard/Howard目录中，
#cd /home/howard/Howard
#ls
#cat yangxuan.txt
# cat yangxuan.txt
PID TTY TIME CMD
9797 pts/1 00:00:00 bash
26818 pts/1 00:00:00 ps
yangxuan yajhuriosaehfiukghjnvjxsgrk
注：
1) 添加TFTP功能
2) 主机和cavium机要配在同一个网段
常见错误：
Please reference the diagnose log .
Red Hat Enterprise Linux ES release 3 (Taroon Update 3)
Kernel 2.4.21-40.ELsmp on an i686
welcome to 10.150.4.18
login: foxadm
Password:
Last login: Fri Aug 10 15:15:00 from 10.134.28.133
[foxadm@dbaweb foxadm]$ telnet 10.130.14.34
Trying 10.130.14.34...
Connected to 10.130.14.34 (10.130.14.34).
Escape character is '^]'.
Red Hat Enterprise Linux AS release 4 (Nahant Update 2)
Kernel 2.6.9-22.ELsmp on an x86_64
login: root
Password:
Last login: Sat Aug 11 11:42:11 from 10.148.53.63
You have new mail.
Hi
cnsbgctbs</root>#
cnsbgctbs</root>#
cnsbgctbs</root>#exportfs -v
/exp/ware hstest(rw,async,wdelay,root_squash)
/exp/4.25bak <world>(rw,wdelay,root_squash)
cnsbgctbs</root>#df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/cciss/c0d0p1 10317828 6174372 3619340 64% /
/dev/cciss/c0d0p5 103210940 29794928 68173204 31% /dbspace1
/dev/cciss/c0d0p3 103210972 15777500 82190660 17% /dbspace2
none 2020892 0 2020892 0% /dev/shm
/dev/cciss/c0d0p8 362234144 108223444 235610256 32% /exp
/dev/cciss/c0d0p2 103210972 93852 97874308 1% /hist
/dev/cciss/c0d0p6 15116836 10604324 3744608 74% /u
cnsbgctbs</root>#ps -ef|grep nfs
root 2431 2391 0 14:40 pts/4 00:00:00 grep nfs
cnsbgctbs</root>#service nfs status
Shutting down NFS mountd: rpc.mountd is stopped
nfsd is stopped
rpc.rquotad is stopped
cnsbgctbs</root>#ps -ef|grep rpc
root 2764 1 0 Jun20 ? 00:00:16 rpc.idmapd
root 26122 1 0 11:40 ? 00:00:00 rpc.idmapd
root 2455 2391 0 14:41 pts/4 00:00:00 grep rpc
cnsbgctbs</root>#kill -9 2764 26122
cnsbgctbs</root>#service nfs restart
Shutting down NFS mountd: [FAILED]
Shutting down NFS daemon: [FAILED]
Shutting down NFS quotas: [FAILED]
Shutting down NFS services: [ OK ]
Starting NFS services: [ OK ]
Starting NFS quotas: Cannot register service: RPC: Unable to receive; errno = Co
nnection refused
rpc.rquotad: unable to register (RQUOTAPROG, RQUOTAVERS, udp).
[FAILED]
Starting NFS daemon:
cnsbgctbs</root>#
cnsbgctbs</root>#service nfs stop
Shutting down NFS mountd: [FAILED]
Shutting down NFS daemon: [FAILED]
Shutting down NFS quotas: [FAILED]
Shutting down NFS services: [ OK ]
cnsbgctbs</root>#ps -ef|grep nfs
root 2550 1 0 14:41 pts/4 00:00:00 rpc.nfsd 8
root 2588 2391 0 14:42 pts/4 00:00:00 grep nfs
cnsbgctbs</root>#kill -9 2550
cnsbgctbs</root>#ps -ef|grep nfs
root 2550 1 0 14:41 pts/4 00:00:00 rpc.nfsd 8
root 2596 2391 0 14:42 pts/4 00:00:00 grep nfs
cnsbgctbs</root>#uptime
14:42:28 up 51 days, 23:21, 4 users, load average: 0.60, 0.30, 0.16
cnsbgctbs</root>#cd /etc/init.d
cnsbgctbs</etc/init.d>#service portmap status
portmap dead but subsys locked
cnsbgctbs</etc/init.d>#ps -ef |grep port
root 2831 2391 0 14:44 pts/4 00:00:00 grep port
cnsbgctbs</etc/init.d>#rpcinfo
Usage: rpcinfo [ -n portnum ] -u host prognum [ versnum ]
rpcinfo [ -n portnum ] -t host prognum [ versnum ]
rpcinfo -p [ host ]
rpcinfo -b prognum versnum
rpcinfo -d prognum versnum
cnsbgctbs</etc/init.d>#rpcinfo -p cnsbgctbs
rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused
cnsbgctbs</etc/init.d>#./portmap start
Starting portmap: [ OK ]
cnsbgctbs</etc/init.d>#rpcinfo -p cnsbgctbs
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
cnsbgctbs</etc/init.d>#service nfs start
Starting NFS services: [ OK ]
Starting NFS quotas: [ OK ]
Starting NFS daemon: [ OK ]
Starting NFS mountd: [ OK ]
Starting RPC idmapd: [ OK ]
cnsbgctbs</etc/init.d>#exportfs -v
/exp/ware hstest(rw,async,wdelay,root_squash)
/exp/4.25bak <world>(rw,wdelay,root_squash)
cnsbgctbs</etc/init.d>#ls
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