Re: mount --no-canonical seems broken.

Re: mount --no-canonical seems broken.

[Linda Walsh]

Karel Zak wrote:
>
> The problem is that "mount" (without options) prints always canonicalized 
> paths (and in this case --no-canonicalize has no effect, this option
> is used for mounting only). It means if you have non-canonical paths
> in /etc/mtab then "mount" still prints canonical paths. I can fix it
> and make the output sensitive to --no-canonicalize option too.
>
> Anyway, use findmnt, it provides but complete control on the output.
>
>     Karel
>   
----
    Sure give better control, but not as widely known as "df" or "mount".

I might point out that by default,
> findmnt /

TARGET SOURCE    FSTYPE OPTIONS
/      /dev/root xfs    rw,nodiratime,relatime,attr2,inode64,noquota
> > l /dev/root
ls: cannot access /dev/root: No such file or directory

-----
It's not a device in /dev/ nor is it in /proc/devices.

Conversely, 

klogd 1.4.1, log source = ksyslog started.
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.9.0-Isht-Van (law@Ishtar) (gcc version
4.7.2 20130205 [gcc-4_7-branch revision 195759] (SUSE Linux) ) #6 SMP
PREEMPT Wed May 8 17:28:40 PDT 2013
[    0.000000] Command line: BOOT_IMAGE=390-Isht-Van rw root=/dev/sdc1
root=/dev/sdc1 showopts console=ttyS0,115200n8 console=tty0 elevator=cfq
pcie_aspm=force pcie_ports=native reboot=bios

The kernel seems to know the root image at boot (even told twice from
this output!)

Not to mention, there is some comment in the kernel-related code of using
/dev/root because there is no writable storage available... even though
the command line
shows that root is mounted 'rw'...

Re: mount --no-canonical seems broken.

[Karel Zak]

On Mon, May 20, 2013 at 04:30:21PM -0700, Linda Walsh wrote:
>  widely known as "df" or "mount".
> 
> I might point out that by default,
> > findmnt /
> 
> TARGET SOURCE    FSTYPE OPTIONS
> /      /dev/root xfs    rw,nodiratime,relatime,attr2,inode64,noquota
> > > l /dev/root
> ls: cannot access /dev/root: No such file or directory

 util-linux 2.23 ? 
 
 libmount since this version is able to use the root= kernel command
 line option to convert /dev/root from the /proc/self/mountinfo file
 to a real device name.

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com

Re: mount --no-canonical seems broken.

[Linda Walsh]

Karel Zak wrote:
> On Mon, May 20, 2013 at 04:30:21PM -0700, Linda Walsh wrote:
>   
>>  widely known as "df" or "mount".
>>
>> I might point out that by default,
>>     
>>> findmnt /
>>>       
>> TARGET SOURCE    FSTYPE OPTIONS
>> /      /dev/root xfs    rw,nodiratime,relatime,attr2,inode64,noquota
>>     
>>>> l /dev/root
>>>>         
>> ls: cannot access /dev/root: No such file or directory
>>     
>
>  util-linux 2.23 ? 
>  
>  libmount since this version is able to use the root= kernel command
>  line option to convert /dev/root from the /proc/self/mountinfo file
>  to a real device name.
>   
----
    I'm only at 2.19, will get & try newer version.  Thanks!