Hi,
If you're using "rbd_aio_write()" in your code, be aware of the fact that
before Luminous release, this function expects buffer to remain unchanged
until write op ends, and on Luminous and later this function internally
copies the buffer, allocating memory where needed, freeing it once write is
done.
If you write an app that may need to work with Luminous *and* pre-Luminous
versions of librbd, you may want to provide a version check (using
rbd_version() for example) so either your buffers won't change before write
is done or you don't incur a penalty for unnecessary memory allocation and
copy on your side (though it's probably unavoidable with current state of
Luminous).
--
Piotr Dałek
piotr.dalek@xxxxxxxxxxxx
https://www.ovh.com/us/
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