[debbugs-tracker] bug#15986: closed (df in current coreutils shows the device for loop mounts, not the file)

[GNU bug Tracking System]

Your message dated Thu, 28 Nov 2013 18:06:37 +0100
with message-id <address@hidden>
and subject line Re: bug#15986: df in current coreutils shows the device for 
loop mounts, not the file
has caused the debbugs.gnu.org bug report #15986,
regarding df in current coreutils shows the device for loop mounts, not the file
to be marked as done.

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15986: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15986
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> Subject: 
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> df in current coreutils shows the device for loop mounts, not the file
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> Date: 
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> Thu, 28 Nov 2013 15:34:02 +0100
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> User-agent: 
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> Mutt/1.5.21 (2010-09-15)
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> Df in older coreutils showed the file of a loop mount whereas currently it
> shows you the loop device. This is IMHO bogus as what good is that info?
>
> Is this a deliberate change or a side effect of other changes? I searched
> ChangeLog but didn't find anything relating to it (at least in my eyes).
>
> Philipp
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> --- End Message ---
> --- Begin Message ---
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> Subject: 
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> Re: bug#15986: df in current coreutils shows the device for loop mounts, not the file
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> Date: 
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> Thu, 28 Nov 2013 18:06:37 +0100
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> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0
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> tag 15986 notabug
> thanks
>
> On 11/28/2013 03:34 PM, Philipp Thomas wrote:
> > Df in older coreutils showed the file of a loop mount whereas currently it
> > shows you the loop device. This is IMHO bogus as what good is that info?
> >
> > Is this a deliberate change or a side effect of other changes? I searched
> > ChangeLog but didn't find anything relating to it (at least in my eyes).
>
> Hi Philipp,
>
> on systems where /etc/mtab is a regular file, 'mount' writes the name of
> the backing file into /etc/mtab.
> Nowadays, as /etc/mtab is a symlink to /proc/self/mounts, this information
> is not available to 'df' anymore.
>
> According to util-linux sources [1], such information is available in
>   /sys/block/loopN/loop/backing_file (kernel >= 2.6.37 is required).
> Therefore, 'mount' makes this extra lookup in that file to display the
> name of the backing file.
>
> I don't think it's a good idea to add such functionality to 'df',
> as this is rather OS-dependent. Furthermore, OS-specific tools - in this
> case e.g. 'mount' from util-linux for the Linux platform - already display
> the name of the backing file.
>
> As it's therefore not a bug in 'df', I'm hereby marking this bug as done,
> but this should not prevent you or anybody else to continue discussion.
>
> [1]
> http://git.kernel.org/cgit/utils/util-linux/util-linux.git/tree/lib/loopdev.c#n518
>
> Have a nice day,
> Berny
>
>
> --- End Message ---