CentOS - Nov 2007 - mounting filesystems with blocks larger then 4k over a loop device

So I'm playing around with S3 and elasticdrive, and I create a 
filesystem on it with a block size larger then 4k. 

mkfs.xfs -b size=8k /mnt/ed5/ed0 -f

This completes fine and sets up the proper filesystem.  When I try to 
mount it, however, I get:

mount /mnt/ed5/ed0 /mnt/eds35/ -o loop


mount: Function not implemented

looking at dmesg I get:

XFS: Attempted to mount file system with blocksize 8192 bytes
XFS: Only page-sized (4096) or less blocksizes currently work.
XFS: SB validate failed


I had similar issues with reiserFS.  Is there a way to get a filesystem 
with larger then 4k blocks in CentOS 5?

Russ

Ruslan Sivak wrote:
> So I'm playing around with S3 and elasticdrive, and I create a 
> filesystem on it with a block size larger then 4k.
> mkfs.xfs -b size=8k /mnt/ed5/ed0 -f
>
> This completes fine and sets up the proper filesystem.  When I try to 
> mount it, however, I get:
>
> mount /mnt/ed5/ed0 /mnt/eds35/ -o loop
>
>
> mount: Function not implemented
>
> looking at dmesg I get:
>
> XFS: Attempted to mount file system with blocksize 8192 bytes
> XFS: Only page-sized (4096) or less blocksizes currently work.
> XFS: SB validate failed
>
>
> I had similar issues with reiserFS.  Is there a way to get a 
> filesystem with larger then 4k blocks in CentOS 5?
>
> Russ
>
Looks like I would need something like this:

http://lwn.net/Articles/249169/

does anyone know wh ether this is part of CentOS yet, or if there is 
some sort of binary available?

Russ

> mount: Function not implemented
> 
> looking at dmesg I get:
> 
> XFS: Attempted to mount file system with blocksize 8192 bytes
> XFS: Only page-sized (4096) or less blocksizes currently work.
> XFS: SB validate failed
> 
> 
> I had similar issues with reiserFS.  Is there a way to get a 
> filesystem with larger then 4k blocks in CentOS 5?
maybe you need to specify block size (bs= see the mount manpage) when
mounting or...
the man page says it can only be as big as pagesize. Check your page
size `$ getconf PAGE_SIZE`, maybe that's the problem. 

See also: http://lwn.net/Articles/249169/

http://www.uwsg.iu.edu/hypermail/linux/kernel/0706.2/1960.html: Commit
seems to show after linux-2.6.22 you should be able to ignore page size
when mounting XFS volumes.

Good luck
Patrick