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Re: tune2fs -j on mounted FS

"Theodore Ts'o" <tytso mit edu> writes:

> On Wed, Oct 29, 2003 at 07:52:23PM +0000, Sean Neakums wrote:
>> Just now I ran tune2fs -j on the root filesystem of a box running
>> 2.6.0-test8.  Then I edited /etc/fstab and changed the FS type to from
>> ext2 to ext3, saved the file, and invoked vim on the file again.  A
>> few moments after this, the box hung.  Unfortunately X was running at
>> the time, and so I don't have any messages to cite.
>> Is this a known problem?
> This is the first time anyone has reported anything like this.  All
> tune2fs -j does on a mounted filesystem is to create a normal file
> (which is used for the journal), mark it immutable, and the modify the
> superblock to set the has_journal flag and set the journal inode
> number.   None of this should cause a kernel hang.  

I was rather taken aback myself.

> What version of e2fsprogs/tune2fs were you using?

tune2fs -V reports "tune2fs 1.35-WIP (21-Aug-2003)"

Obtained from Debian package e2fsprogs version 1.34+1.35-WIP-2003.08.21-3.

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