Re: [RFC] delayed allocation for ext4

[Alex Tomas]

>>>>> Christoph Hellwig (CH) writes:

 CH> Note that recording delayed alloc state at a page granularity in addition
 CH> to just the buffer heads has a lot of advantages aswell and would help
 CH> xfs, too.  But I think it makes a lot more sense to record it as a radix
 CH> tree tag to speed up the gang lookups for delalloc conversion.

please, exaplein about radix tree tag. in ext4-delalloc I use this
bit the only way - to avoid multiple reservation space for same
page. I guess you need to find non-allocated pages. probably to
flush them and update number of reserved blocks in case of -ENOSPC?

thanks, Alex
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