On 01/04/2013 06:51 AM, Alex Elder wrote:
Currently every osd request submitted by the rbd code undergoes a
file mapping operation, which is common with what the ceph file system
uses. But some analysis shows that there is no need to do this for
rbd, because it already takes care of its own blocking of image data
into distinct objects. Removing this simplifies things. I especially
think removing this improves things conceptually, removing a complex
mapping operation from the I/O path.
-Alex
[PATCH REPOST 1/3] rbd: pull in ceph_calc_raw_layout()
[PATCH REPOST 2/3] rbd: open code rbd_calc_raw_layout()
[PATCH REPOST 3/3] rbd: don't bother calculating file mapping
We'll want to use similar methods later for fancier rbd striping with
format 2 images, but that'll take more restructuring later anyway.
This is fine for now.
Reviewed-by: Josh Durgin
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