> 2018-03-27 13:24 GMT+03:00 Dai Qizhi <qzdai@xxxxxxxxxxxxxxx>: > > Dear Amir Goldstein, > > > > Hi Dai, > > Do you mind if I re-posting your question to overlayfs mailing list. > There are other people out there that would encounter the same > problem and will benefit from my answer. no problem. > > > I tested overlayfs with nfs_export feature , the kernel is built by > > ubuntu , 4.16.0-041600rc7, http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc7/ > > > > the problem is , when i export two different overlay mount points on > > server side, then mount them use nfs on the client side, the client side > > views the two differnet mount points as the same. > > > > > > on server side: > > > > none on /mnt/m1 type overlay (rw,relatime,lowerdir=m1/ro,upperdir=m1/rw,workdir= > > m1/w,index=on,nfs_export=on) > > none on /mnt/m2 type overlay (rw,relatime,lowerdir=m2/ro,upperdir=m2/rw,workdir= > > m2/w,index=on,nfs_export=on) > > [root@localhost data]# exportfs -rv > > exporting *:/mnt/m4 > > exporting *:/mnt/m3 > > exporting *:/mnt/m2 > > exporting *:/mnt/m1 > > [root@localhost data]# ls /mnt/m1 > > this_is_m1 > > [root@localhost data]# ls /mnt/m2 > > this_is_m2 > > > > > > on client side: > > > > [root@localhost mnt]# mount 192.168.0.1:/mnt/m1 m1 > > [root@localhost mnt]# mount 192.168.0.1:/mnt/m2 m2 > > [root@localhost mnt]# mount |grep 192 > > 192.168.0.1:/mnt/m1 on /mnt/m1 type nfs (rw,relatime,vers=3,rsize=524288,wsize=5 > > 24288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.0. > > 1,mountvers=3,mountport=20048,mountproto=udp,local_lock=none,addr=192.168.0.1) > > 192.168.0.1:/mnt/m1 on /mnt/m2 type nfs (rw,relatime,vers=3,rsize=524288,wsize=5 > > 24288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.0. > > 1,mountvers=3,mountport=20048,mountproto=udp,local_lock=none,addr=192.168.0.1) > > > > [root@localhost mnt]# ls /mnt/m1 > > this_is_m1 > > [root@localhost mnt]# ls /mnt/m2 > > this_is_m1 > > [root@localhost mnt]# > > > Please refer to the man page of exports(5), the section about 'fsid' describes > this problem related to exporting file systems that are not on a block device, > such as overlayfs. yes, export different mount point with different fsid= option works as expected. > > If you are interested to know if there is a way to fix this that does > not involve manually > configuring different fsid per export, I will have to consult with the > NFS experts, so please > reply to this message with CC to <linux-unionfs@xxxxxxxxxxxxxxx> and > <linux-nfs@xxxxxxxxxxxxxxx> when exporting parent directory with crossmnt option and mount differnet overlayfs under that directory, we encounter the same problem on client side.. > > Thanks, > Amir. Best regards, Dai Qizhi -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
