On Wed, Oct 31, 2012 at 1:24 PM, Karel Zak <kzak@xxxxxxxxxx> wrote: > On Tue, Oct 30, 2012 at 11:03:59PM +0000, Matt Burgess wrote: >> 1) mount(8) >> >> /dev/root on / type ext3 (rw,relatime,data=ordered) > > I see (Fedora 17, util-linux 2.21.2) > /dev/sda4 on / type ext4 (rw,relatime,data=ordered) We see that only if we use an initramfs. In case the kernel mounts the fs directly and internally, there is /dev/root showing up. >> Nope, that's not /dev/sda3. And what is /dev/root anyway? There's no >> such node under /dev here. The kernel creates that node in its own 'rootfs' names filesystem, the parent of the entire filesystem mount tree; but this is never visible anywhere in the real system, and never was. Ideally, the kernel would be fixed to use the root= string, and not invent a name that does never exist. > if I good remember there was symlink in some distributions Some distributions created /dev/root with udev rules which have been composed at bootup. We dropped all that, because it is logic backwards and nothing on the system should rely on /dev/root being available. Modern filesystems like btrfs do not follow the "there is a single device below that mountpoint logic". Kay -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
