On 9/29/2015 9:47 AM, Sagi Grimberg wrote:
Shouldn't higher layers take care of this? Trying to implement the same
coalescing algorithm at various layers isn't very optimal, although we
need to decide and document which one is responsible.
The block layer can take care of it, but I'm not sure about NFS/RDS at
the moment (IIRC Steve specifically asked if this API would take care
of chunking contig sg elements) so I'd rather keep it in until we are
absolutely sure we don't need it.
I can add a documentation statement for it.
Actually its documented:
* Constraints:
* - The first sg element is allowed to have an offset.
* - Each sg element must be aligned to page_size (or physically
* contiguous to the previous element). In case an sg element has a
* non contiguous offset, the mapping prefix will not include it.
* - The last sg element is allowed to have length less than page_size.
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