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Old 14th February 2012, 12:49 PM
mikebg Offline
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Join Date: Jun 2008
Posts: 38
Cannot reformat partition - in use by jbd2

Using Fedora 16 (64 bit) with ext4 filesystem. I previously ran Fedora 14 32 bit edition and ran a disk copy operation three times a week and once a month, which built a new filesystem on a spare disk and then copied the entire filesystem onto it. It ran without fail until installing a fresh 64 bit Fedora 16.

I now find that once a filesystem has been mounted, it will never be 'forgotten' by the system, as it is being held by jbd2. For example:

Linux-root (13:16) /home/mybg # lsof -ln | grep sdb2
jbd2/sdb2 20664 0 cwd DIR 9,0 4096 2 /
jbd2/sdb2 20664 0 rtd DIR 9,0 4096 2 /
jbd2/sdb2 20664 0 txt unknown /proc/20664/exe

Also here:
Linux-root (13:43) /home/mybg # ls -l /proc/fs/jbd2/
total 0
dr-xr-xr-x 2 root root 0 Feb 14 13:43 md0-8/
dr-xr-xr-x 2 root root 0 Feb 14 13:43 sdb2-8/
dr-xr-xr-x 2 root root 0 Feb 14 13:43 sdc2-8/
dr-xr-xr-x 2 root root 0 Feb 14 13:43 sde2-8/
dr-xr-xr-x 2 root root 0 Feb 14 13:43 sdf2-8/

All the partitions apart from md0 are backup partitions.

I cannot reformat any of these partitions, nor can I run e2fsck on them:

Linux-root (13:45) /home/mybg # /sbin/mkfs -v -t ext4 -m 1 -L tuesday /dev/sdb2
mke2fs 1.41.14 (22-Dec-2010)
/dev/sdb2 is apparently in use by the system; will not make a filesystem here!

Linux-root (13:46) /home/mybg # e2fsck /dev/sdb2
e2fsck 1.41.14 (22-Dec-2010)
e2fsck: Device or resource busy while trying to open /dev/sdb2
Filesystem mounted or opened exclusively by another program?

Any ideas? I have hunted for solutions but found nothing so far!
I could do a rm -fr on the mounted old backup filesystem before copying the current filesystem, but it would take far longer then just creating a new filesystem with mkfs.
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Old 21st April 2012, 05:18 PM
dmguru Offline
Registered User
Join Date: Dec 2008
Posts: 11
Re: Cannot reformat partition - in use by jbd2

Any luck finding a solution? I'm having same issue and have searched for hours looking for a solution.
I can't seem to find much documentation about jbd2.

I've unmounted file system but can't run fsck on it because jbd2 has the file system in use.
Can't seem to kill the jbd2 process either.
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jbd2, partition, reformat

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