lkml.org 
[lkml]   [2013]   [Mar]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] init: fix name of root device in /proc/mounts
From
Date
Yes, but the current udev maintainer refuses to.

Rob Landley <rob@landley.net> wrote:

>On 03/19/2013 07:20:17 PM, William Hubbs wrote:
>> On Tue, Mar 19, 2013 at 04:17:11PM -0700, H. Peter Anvin wrote:
>> > On 03/19/2013 03:28 PM, William Hubbs wrote:
>> > > The issue is that /dev/root appears in /proc/mounts if you do not
>> > > boot with an initramfs, but /dev/root is not a device node. In
>the
>> > > past, udev created a symbolic link from /dev/root to the
>> > > appropriate block device, but it does not do this any longer.
>> Also,
>> > > devtmpfs does not create this symbolic link.
>> > >
>> > > This is causing bugs with software that depends on the existence
>> > > of /dev/root [2] for example.
>> >
>> > Seems okay to me, although even better would be to use the udev
>name
>> > of the device in question.
>>
>> I'm not following what you mean.
>>
>> The problem is that "/dev/root" should not be in /proc/mounts,
>> since there is always another entry that points to the root
>> file system.
>
>What gave you that idea?
>
>wget http://landley.net/aboriginal/bin/system-image-i686.tar.bz2
>extract it and ./run-emulator.sh and in there:
>
>(i686:1) /home # cat /proc/mounts
>rootfs / rootfs rw 0 0
>/dev/root / squashfs ro,relatime 0 0
>proc /proc proc rw,relatime 0 0
>sys /sys sysfs rw,relatime 0 0
>dev /dev devtmpfs rw,relatime,size=63072k,nr_inodes=15768,mode=755 0 0
>dev/pts /dev/pts devpts rw,relatime,mode=600 0 0
>/tmp /tmp tmpfs rw,relatime 0 0
>/home /home tmpfs rw,relatime 0 0
>
>Userspace can totally determine what /dev/root points to, I made mdev
>do it in 2006 (udev started doing so shortly thereafter). Busybox git
>commit a7e3d052.
>
>Heck, the userspace "stat /" command says "Device: 801h" and /dev/sda1
>
>is 08:01 on my netbook.
>
>Rob

--
Sent from my mobile phone. Please excuse brevity and lack of formatting.


\
 
 \ /
  Last update: 2013-03-20 16:21    [W:1.325 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site