In this topic I would like to present the API I use for exporting PNFS layouts, and recall layouts from a Kernel FileSystem. I use this API from the Ganesha server, to enable pnfs export both from the in Kernel exofs FS, as well as from the proprietary PanFS filesystem driver of the Panasas's cluster. Same exact API works well. The API is currently an IOCTL based, I understand it might want to be delegated to a syscall. With common code. The API is based on all the same types and structures as the In Kernel (out-of-tree) PNFS project and API's. 80% of the vectors implemented for the in-kernel server are identical to the in-kernel implementation. The remaining 20% can have a common core code at the FS, and two wrappers one for each server. Mainly the big difference is in how the RECALLs are made. The two filesystems I coded also use a common library I call libpnfs_logic which can or not be used by FSs to implement their internal logic. This is because all this logic is currently inside the KPNFSD server, but it cannot be when the Server is in user mode. The In Kernel Server can also be converted to use libpnfs_logic but I have not yet attempted such a conversion and the code is currently duplicated. I will post later, the header I use for the IOCTL and a git URL for the hard cores. But we need not talk details, we should only discus in principle if it is wanted, and how it should fit with the In-Kernel PNFS project. Thanks Boaz -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
