On 2010-01-25, at 14:14, Alberich de megres wrote:
I'm studyng ext4 code, and i got a doubt on a situation:
Supposing a 4K page size, and a fs with 8K.. when we are filling
page info,:
{ 4K page }{ 4K page }{ 4K page }{ 4K page }
[ group 0 bitmap ][ group 0 buddy ]
Clearly bitmap and buddy info don't fits on a single page, but e4b
structure saves only one page address.
How mb allocator menages this situation??
ext4, and the Linux VM/block layer in general, do not support disk
block size larger than the page size. That has been a restriction for
a long time already, and there have been various patches/proposals to
fix that, but nothing that ever made it into the mainline kernel.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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