GNU logs - #28991, boring messages

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Subject: bug#28991: df: wrong output when a FS masks another one
Resent-From: Stephane Chazelas <stephane.chazelas@HIDDEN>
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Date: Wed, 25 Oct 2017 15:57:15 +0100
From: Stephane Chazelas <stephane.chazelas@HIDDEN>
Message-ID: <20171025145715.GE5071@HIDDEN>
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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/austin-group-l@HIDDEN/msg01715.html
https://www.mail-archive.com/austin-group-l@HIDDEN/msg01720.html

Not critical as that could be considered as a pathological test
case.

-- 
Stephane

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To: Stephane Chazelas <stephane.chazelas@HIDDEN>
Subject: bug#28991: Acknowledgement (df: wrong output when a FS masks
 another one)
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Subject: bug#28991: df: wrong output when a FS masks another one
Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady <P@HIDDEN>
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To: Stephane Chazelas <stephane.chazelas@HIDDEN>, 28991 <at> debbugs.gnu.org, 28670 <at> debbugs.gnu.org
References: <20171025145715.GE5071@HIDDEN>
From: =?UTF-8?Q?P=C3=A1draig?= Brady <P@HIDDEN>
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Date: Wed, 25 Oct 2017 21:48:09 -0700
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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/austin-group-l@HIDDEN/msg01715.html
> https://www.mail-archive.com/austin-group-l@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,
P�draig

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severity 28991 wishlist
merge 28991 28670

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