On Tue, May 29, 2018 at 02:14:12AM +0100, Al Viro wrote: > On Tue, May 29, 2018 at 09:24:56AM +0900, Jungsub Shin wrote: > > Mount command : mount -t aufs -o 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none ~/tca_agent/container_root_dir/51509032 > > dmesg : [343090.744067] aufs opt_add:810:mount[30864]: lookup failed /root/tca_agent/image_layer_di (-2) I think kernel at least must print warning message when mount option overflow the PAGE_SIZE if length of mount option should be fixed. When i encouter this problem, i found the reason hard because of lack of kernel log and wrong infomation. > > ------------------------------------------------------------------------ > > > > br option is cut and aufs search cut directory. Length of mount option > > is about 6400. > > The lack of planning on your part... > > IOW, don't do it. Use of symlinks (or bindings) might alleviate the problem > if aufs interface is that nasty. And before you go "just read up to \0", > consider e.g. NFS flavours with binary data structure passed instead of > a string. Do you mean using symlinks or bind mount to reduce length of mount options?? I can remove "~/tca_agent/image_layer_dir" string. But the other character means unique ID of layer and i can't compress it or replace it to another string. This is not fundamental solution. Docker use the same unique ID to manage layers. As i said before overlayfs could suffer same problem because overlayfs support multiple lowerdir options and there is no route to pass lower dirs without mount option. So i think to support unionfs stably in kernel, dynamic memory allocation for mount option is needed. Thanks.
