kern/164516: [ext2fs] unable to mount EXT2 filesystem

[Uffe Jakobsen]

On 2012-01-28 01:47, Jeremy Chadwick wrote:
> On Fri, Jan 27, 2012 at 11:10:11PM +0000, Uffe Jakobsen wrote:
>> The following reply was made to PR kern/164516; it has been noted by GNATS.
>>
>> From: Uffe Jakobsen<uffe at uffe.org>
>> To: bug-followup at FreeBSD.org
>> Cc:
>> Subject: Re: kern/164516: [ext2fs] unable to mount EXT2 filesystem
>> Date: Fri, 27 Jan 2012 20:49:05 +0100
>>
>>    >
>>    >  Not a bug. The file system type name is "ext2fs" not "ext2".
>>    >  Use "mount -t ext2fs /dev/md0 /mnt/tmp0" instead.
>>    >
>>
>>   Instead of reporting "Operation not supported by device"
>>   Shouldn't it report unknown filesystem type ?
>
> Please look through /usr/include/errno.h and let us know what error code
> would represent "unknown filesystem type".  :-)
>

There are plenty of other places in the mount src where we exit without 
a specific error code. Question is if there exists a scenario where the 
requested filesystem type would/could not be found by getvfsbyname() ?

I've met this problem myself a number of times - and even in this case I 
did not spot the spelling error right away ('ext2fs' and not 'ext2').

The returned error 'Operation not supported by device' - atleast to me - 
indicates that the mount process got much further before running into 
some kind of problem. The times when I've met this error I've begun 
inspecting mount options etc before realizing that the fstype had a typo.

/Uffe