Dear all, I've been using aufs3 with linux 3.18.1 for quite some time now. Since last week I'm trying to upgrade to aufs4 and have compiled a kernel in both the aufs-4.4 and aufs-4.x-rcN branches (the latter resulting in linux-4.5. I did (make) install the aufs-util accordingly. As soon as I boot either aufs-4.4 or aufs-4.x-rcN I have a problem with sub-directories and copy-on-write branches of my filesystem. Where in aufs3 this is working. For example, my root filesystem is mounted read-only, as such /root is also a read-only directory. # ls /root -l # touch /root/t touch: cannot touch '/root/t': Read-only file system total 8 drwxr-xr-x 3 root root 4096 Feb 21 20:32 def drwxr-xr-x 2 root root 4096 Feb 21 20:32 test I then use the following command to mount /mnt: # mount -t aufs -o br:/tmp/rw=rw:/root=ro none /mnt then: # touch /mnt /t # ls /mnt -l total 8 drwxr-xr-x 3 root root 4096 Feb 21 20:32 def -rw-r--r-- 1 root root   0 Feb 21 20:33 t drwxr-xr-x 2 root root 4096 Feb 21 20:32 test # touch /mnt/test/t touch: cannot touch '/mnt/test/t': Operation not supported Best regards, Marc Dirix Attached is my config.gz /proc/mount: /dev/root / ext2 ro,relatime,errors=continue 0 0 devtmpfs /dev devtmpfs rw,relatime,size=126624k,nr_inodes=31656,mode=755 0 0 sysfs /sys sysfs rw,relatime 0 0 tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=25348k,mode=755 0 0 tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0 proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 tmpfs /run/shm tmpfs rw,nosuid,nodev,noexec,relatime,size=50680k 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620 0 0 tmpfs /tmp tmpfs rw,relatime 0 0 tmpfs /vardynamic/run tmpfs rw,relatime 0 0 tmpfs /vardynamic/local tmpfs rw,relatime 0 0 tmpfs /vardynamic/cache tmpfs rw,relatime 0 0 tmpfs /var/spool tmpfs rw,relatime 0 0 tmpfs /var/log tmpfs rw,relatime 0 0 aufs /run aufs rw,noatime,si=e84e2694 0 0 aufs /var/cache aufs rw,noatime,si=ec82fe94 0 0 tmpfs /var/lib/dhcp tmpfs rw,relatime 0 0 tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0 tmpfs /run/shm tmpfs rw,nosuid,nodev,noexec,relatime,size=50680k 0 0 rpc_pipefs /run/rpc_pipefs rpc_pipefs rw,relatime 0 0 192.168.1.10:/public /nas nfs rw,noatime,vers=3,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,timeo=60 0,retrans=2,sec=sys,mountaddr=192.168.1.10,mountvers=3,mountport=55620,mount proto=udp,local_lock=none,addr=192.168.1.10 0 0 /dev/sdb1 /home xfs rw,noatime,attr2,inode64,noquota 0 0 /dev/sdb1 /srv xfs rw,noatime,attr2,inode64,noquota 0 0 192.168.1.10:/home/marc /home/marc/storage nfs rw,noatime,vers=3,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,timeo=60 0,retrans=2,sec=sys,mountaddr=192.168.1.10,mountvers=3,mountport=55620,mount proto=udp,local_lock=none,addr=192.168.1.10 0 0 none /mnt aufs rw,relatime,si=eca6f294 0 0 /sys/fs/aufs/si_e84e2694 /sys/fs/aufs/si_e84e2694/br0 /sys/fs/aufs/si_e84e2694/br1 /sys/fs/aufs/si_e84e2694/xi_path /sys/fs/aufs/si_e84e2694/brid0 /sys/fs/aufs/si_e84e2694/brid1 /sys/fs/aufs/si_ec82fe94 /sys/fs/aufs/si_ec82fe94/br0 /sys/fs/aufs/si_ec82fe94/br1 /sys/fs/aufs/si_ec82fe94/xi_path /sys/fs/aufs/si_ec82fe94/brid0 /sys/fs/aufs/si_ec82fe94/brid1 /sys/fs/aufs/si_eca6f294 /sys/fs/aufs/si_eca6f294/br0 /sys/fs/aufs/si_eca6f294/br1 /sys/fs/aufs/si_eca6f294/xi_path /sys/fs/aufs/si_eca6f294/brid0 /sys/fs/aufs/si_eca6f294/brid1
config.gz
Description: GNU Zip compressed data
------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140
