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bug#28670: bug#28991: df: wrong output when a FS masks another one
From: |
Pádraig Brady |
Subject: |
bug#28670: bug#28991: df: wrong output when a FS masks another one |
Date: |
Wed, 25 Oct 2017 21:48:09 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 25/10/17 07:57, Stephane Chazelas wrote:
> Test case:
>
> /tmp$ mkdir -p 1/2
> /tmp$ sudo mount -o size=1M -t tmpfs x 1/2
> /tmp$ sudo mount -o size=2M -t tmpfs y 1
> /tmp$ mkdir 1/2
> /tmp$ df -h 1/2
> Filesystem Size Used Avail Use% Mounted on
> x 2.0M 0 2.0M 0% /tmp/1/2
>
> The Size is correct as that's obtained from statfs() on the
> file. But when it comes to finding the corresponding mount
> source and mountpoint, it fails.
>
> /tmp$ grep /tmp/ /proc/mounts
> x /tmp/1/2 tmpfs rw,relatime,size=1024k 0 0
> y /tmp/1 tmpfs rw,relatime,size=2048k 0 0
>
> df should walk /proc/self/mounts or /etc/mtab from the bottom up
> until it finds the first mount point that is a parent of the
> realpath of the file.
>
> /tmp$ df --version
> df (GNU coreutils) 8.28
>
> (on Debian testing amd64)
>
>
> Related: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=15955
>
> That's just been discussed on the austin group mailing list:
> https://www.mail-archive.com/address@hidden/msg01715.html
> https://www.mail-archive.com/address@hidden/msg01720.html
>
> Not critical as that could be considered as a pathological test
> case.
>
Yes it would be nice to behave more consistently here.
Also related is https://bugs.gnu.org/28670
cheers,
Pádraig