* Miklos Szeredi (miklos@xxxxxxxxxx) wrote: > On Fri, 25 Sep 2009, Andreas Gruenbacher wrote: > > On Thursday, 24 September 2009 16:51:58 Miklos Szeredi wrote: > > > This patch adds a new open flag, O_NODE. This flag means: open just > > > the filesystem node instead of the object referenced by the node. > > > > What is the intended use for O_NODE? > > It lets userspace file descriptors reference a inode without actually > "dereferencing" it to get the underlying object. This allows for a > couple of new things: > > - opening a special file (device/socket/fifo) without side effects > > - opening a symlink > > - opening any type of file without any permission is also possible > (of course the resuling file descriptor may not be read or written) > > The above allows fstat(), fchmod(), ioctl(), etc to be used for files > previously not possible. Given an fd opened in this way is it possible to reopen it normally and be guarenteed to get the same object? Dave -- -----Open up your eyes, open up your mind, open up your code ------- / Dr. David Alan Gilbert | Running GNU/Linux on Alpha,68K| Happy \ \ gro.gilbert @ treblig.org | MIPS,x86,ARM,SPARC,PPC & HPPA | In Hex / \ _________________________|_____ http://www.treblig.org |_______/ -- 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
