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Message-ID: <CAPXgP11N=8NULMH-o0Us0OuqYpP9sKe9uUKWzE35h1AiRP1Cjg@mail.gmail.com> Date: Mon, 6 Feb 2012 20:45:24 +0100 From: Kay Sievers <kay.sievers@...y.org> To: Kirill Smelkov <kirr@....spb.ru> Cc: linux-kernel@...r.kernel.org Subject: Re: No /dev/root with devtmpfs? On Mon, Feb 6, 2012 at 12:18, Kirill Smelkov <kirr@....spb.ru> wrote: > Recently I've reworked my system not to use udev, but use devtmpfs > instead and discovered there is no /dev/root symlink in devtmpfs case. > > My setup uses /dev/root early to know what is the boot device and then > do some operations on it like checksumming, etc... > > Now when /dev/root is gone the best workaround I could come up with is > to grep /proc/partitions for '[hs]d[a-z]1' but it's ugly and will > break when there are several block devices attached. > > Is it somehow possible to add /dev/root to devtmpfs? No, devtmpfs has no business in knowing anything about the rootfs or who mounted what ans where. I can not create such links. The entire concept of /dev/root is flawed anyway, and nothing should really depend on that. Modern filesystems will not offer a direct relation to a single block device, they allocate an superblock which has a major == 0, so there can be by definition never such a link. Better get rid of all uses of /dev/root, it will just fail in the future. Kay -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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