On Tue, 6 Jul 2010 12:10:02 -0400, "J. Bruce Fields" <bfields@xxxxxxxxxxxx> wrote: > On Fri, Jul 02, 2010 at 02:45:45AM +0530, Aneesh Kumar K. V wrote: > > One use case i had was that if the userspace file server can directly > > work with the returned file system UUID, > > I agree that the uuid should be split out from the rest of the > filehandle, but ... > > > the it can build the file > > handle for client in a single call. > > ... I don't understand why both need to come in the same system call. > Is it purely an efficiency question? If so, why do you expect this to > be significant? Since we know that system wide file handle should include a file system identifier and a file identifier my plan was to retrieve both in the same syscall. > > (I would have thought that the system call overhead is so small, and so > many calls will already be required to perform the typical rpc, that > this would be insignificant.) > > A filesystem uuid seems like a generally useful thing (maybe more so > than a filehandle), so it'd seem worth figuring out how to export that > separately. > I can add a new syscall that returns struct fs_uuid { u8 fs_uuid[16]; }; long sys_get_fs_uuid(int dfd, char *name, struct fs_uuid *fsid, int flag); -aneesh -- 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