Hi! as far as I can see, NFS as lower filesystem should be supported in latest mainline kernels. I've tried to use overlayfs with the combination of a r/o NFS (v3 as well as v4 tested) as lower and tmpfs as (initially empty) upper filesystem, and have some trouble to get it working. Mounting the filesystem works fine, and the merged filesystem shows the contents of the NFS filesystem. However, any open() calls on a file in the overlayfs filesystem fail with ENXIO. When replacing the NFS filesystem by a second tmpfs (keeping mount options and directory structure the same), everything works just as expected. Apart from "nolock,ro", the NFS is mounted with standard mount options. Any bits (e.g. additional requirements on the lower filesystem) that I am missing? If this is a bug in overlayfs, I suppose it should be easy to reproduce, I'm currently using latest git head from Linus' kernel tree (9d37e6679dfddbb5fa605fb2d7ff448f7cd6d038). Thanks! Dominik -- 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
