Unable to mount USB Flash memory created on CentOS

Polytropon freebsd at edvax.de
Sat Jul 29 13:56:08 UTC 2017

On Sat, 29 Jul 2017 10:26:35 +0000, Manish Jain wrote:
> There is a significant problem with the ext2fs driver under FreeBSD. I 
> earlier thought this was perhaps a niggling issue, but this post 
> inclines me to mention it.
> Create an ext2 partition and use it for a while. When there is an 
> improper shutdown/unclean umount, I experienced this syndrome 3 times in 
> the last 3 months : FreeBSD will refuse to mount the partition RW (which 
> is correct) - but then FreeBSD e2fsck will not be able to complete a 
> successful fsck. I think the error message from e2fsck used to be : 
> failed + run fsck. No further details. I don't remember what fsck used 
> to report, but nothing worked.

Yes, Linux file system support is limited, as UFS support is
limited on Linux, and nonexistent on non-UNIX... ;-)

> The only way to correct the situation always was - boot into Linux (I 
> use Parrot Lite), run e2fsck therein, and then mount it RW. Then get 
> back to FreeBSD, and now the partition gets mounted coolly.

That's why I suggested using the _native_ file system check and
repair tool is probably the best choice. FreeBSD's ext2 support
doesn't seem to be able to properly deal with those _specific_
cases of file system damage.

There is a port "e2fsprogs" which includes an e2fsck program.
I don't know if there's also a FUSE module for ext2 (and others)
that offers a comparable tool.

> If OP continues to suffer something similar, perhaps he can try fixing 
> things under Linux ?

That would be worth a try, even though I think in this special
case the file system _might_ be (partially?) intact, but at least
the partition table has suffered severe damage - it's not even
listing the ext2 partition correctly anymore. So maybe this can
be restored with a live system CD like PartEd Magic or UBCD...

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

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