On Sat, Dec 23, 2006 at 02:31:23PM +1100, David Chinner wrote:
> > - ext4-delayed-allocation.patch
> > delayed allocation itself, enabled by "delalloc" mount option.
> > extents support is also required. currently it works only
> > with blocksize=pagesize.
>
> Ah, that's why you can get away with a page flag - you've ignored
> the partial page delay state problem. Any plans to use the
> existing method in the future so we will be able to use ext4 delalloc
> on machines with a page size larger than 4k?
I think fixing this up for blocksize < pagesize is an absolute requirement
to get things merged. We don't need more filesystems that are crippled
on half of our platforms.
Note that recording delayed alloc state at a page granularity in addition
to just the buffer heads has a lot of advantages aswell and would help
xfs, too. But I think it makes a lot more sense to record it as a radix
tree tag to speed up the gang lookups for delalloc conversion.
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