linux-kernel - Re: [PATCH 04/14] Pramfs: Mounting as root filesystem

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Date:	Sun, 14 Jun 2009 18:29:38 +0200
From:	Marco <firefox82@...ce.it>
To:	Marco <marco.stornelli@...il.com>
CC:	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Daniel Walker <dwalker@....ucsc.edu>
Subject: Re: [PATCH 04/14] Pramfs: Mounting as root filesystem

David Woodhouse wrote:
> On Sun, 2009-06-14 at 10:21 +0200, Marco wrote:
>> Mmm...MEM_MAJOR and RAMDISK_MAJOR have the same value and pramfs works
>> in memory. We could simply use /dev/null (there was an error in the
>> submitted kconfig description, my intention was to use /dev/mem). In
>> that case I can use UNNAMED_MAJOR. PRAMFS root option is not enabled
>> if it's already enabled the NFS one. What do you think?
>
> Why use a major number at all? See how we handle mtd and ubi devices in
> prepare_namespace() -- can't you do something similar?
>
 
Do you suggest me something similar? Why not. I though that mtd and ubi 
were only special cases.

if (saved_root_name[0]) {
		root_device_name = saved_root_name;
		if (!strncmp(root_device_name, "mtd", 3) ||
		    !strncmp(root_device_name, "ubi", 3) ||
  -------->         !strncmp(root_device_name, "pram", 4)) {
			mount_block_root(root_device_name, root_mountflags);
			goto out;
		}
		ROOT_DEV = name_to_dev_t(root_device_name);
		if (strncmp(root_device_name, "/dev/", 5) == 0)
			root_device_name += 5;
	}
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