On Mon, Jun 23, 2014 at 11:28:00AM +0100, Filipe David Borba Manana wrote:
> In btrfs the block size (called sector size in btrfs) can not be
> smaller then the page size.

Nor larger.

commit 8d082fb727ac11930ea20bf1612e334ea7c2b697
Author: Liu Bo <liubo2...@cn.fujitsu.com>
Date:   Tue Apr 3 09:56:53 2012 +0800

    Btrfs: do not mount when we have a sectorsize unequal to PAGE_SIZE
    
    Our code is not ready to cope with a sectorsize that's not equal to 
PAGE_SIZE.
    It will lead to hanging-on while writing something.

- z
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