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Re: [PATCH] df (without any params) omits the root filesystem line

From: Bernhard Voelker
Subject: Re: [PATCH] df (without any params) omits the root filesystem line
Date: Mon, 28 Jan 2013 14:54:52 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130105 Thunderbird/17.0.2

On 01/28/2013 02:05 PM, Pádraig Brady wrote:
>> Therefore, I'm inclined to make df handle rootfs like any other
>> dummy FS and remove the special treatment as shown in the attachment.
>> WDYT?
> Yes I agree this is better and more consistent.
> It's a bit weird though that `df -t devtmpfs` won't show
> a devtmpfs file system unless -a is specified.
> Maybe -t should imply -a?

Maybe yes, although that would circumvent the de-duplication.
For dummy file systems, this would help, i.e. it would save
the user adding -a, but for regular file systems, this would
mean that all bind mounts appear again:

Example: /dev/sda3 is mounted twice (the latter "ro" ;-)

  $ src/df -a --out=source,fstype,target | grep sda3
  /dev/sda3      ext3                /root/backup
  /dev/sda3      ext3                /media/backup

Currently, df -t ext3 only shows 1 mount entry ...

  $ src/df -t ext3 --out=source,fstype,target | grep sda3
  /dev/sda3      ext3 /root/backup

... while with the above mentioned change, it would result in:

  $ src/df -t ext3 --out=source,fstype,target | grep sda3
  /dev/sda3      ext3 /root/backup
  /dev/sda3      ext3 /media/backup

I'm 40:60 to go this way, because otherwise, there's no
means (i.e. option) to turn on the de-duplication again).

(A more fine-grained alternative would maybe be possible in

Have a nice day,

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