linux-kernel - Re: df -h shows ~10 times bigger size when umounting pendrive

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Message-ID: <49C5DEE5.6090205@davidnewall.com>
Date:	Sun, 22 Mar 2009 17:17:01 +1030
From:	David Newall <davidn@...idnewall.com>
To:	Arkadiusz Miskiewicz <a.miskiewicz@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: df -h shows ~10 times bigger size when umounting pendrive

Arkadiusz Miskiewicz wrote:
> While umount was running and data were synced on the
> pendrive df -h showed:
>
> [arekm@...0 ~]$ df -h
> System plik�w         rozm. u�yte dost. %u�. zamont. na
> /dev/sda3             9,6G  4,2G  5,5G  44% /
> /dev/sdb1             9,6G  4,2G  5,5G  44% /media/floppy
>   

This looks to me like a race between umount and df.  By the time df had
read mtab (to find the mounted filesystem), the pen drive had already
been unmounted; but umount hadn't yet updated mtab.  It's a pretty
trivial sort of fault, and not worth worrying about.
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