Bug 9265

Summary:	DVD-RAM umount and disk free bug
Product:	File System	Reporter:	Mario (ml)
Component:	UDF	Assignee:	Jan Kara (jack)
Status:	RESOLVED INVALID
Severity:	normal	CC:	jack, ml, protasnb
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.15	Subsystem:
Regression:	No	Bisected commit-id:

Description Mario 2007-10-31 03:01:22 UTC

Most recent kernel where this bug did not occur: 2.6.15-26-server (dapper)
Distribution: Ubuntu
Hardware Environment: i386
Software Environment: Ubuntu Dapper LTS
Problem Description: When umounting a DVD-RAM media (umount /tmp/mnt for example) it takes some time. This is normal i guess. But if you use the "df -h" command, it shows that the currently umounting media has 32GB capacy!

Steps to reproduce: 
----------------------------------------------------
mkudffs --spartable=2 --media-type=dvdram /dev/hdc
mount /dev/hdc /tmp/mnt
<copy 300-400MB to /tmp/mnt>
umount /tmp/mnt &
df -h

Comment 1 Natalie Protasevich 2007-11-12 17:56:56 UTC

Mario,
Can you try this with the current kernel (2.6.23+) and confirm if the bug is still there.
Thanks.

Comment 2 Jan Kara 2009-11-04 20:36:58 UTC

This is a race in df(1) itself. During unmounting, statfs already returns a result for the parent filesystem because the filesystem is already removed from the directory tree (i.e. your /tmp filesystem has 32 GB capacity ;).