Rados and user-provided buffers

[Rutger ter Borg <rutger@terborg.net>]

Dear all,

I've a question regarding buffers in rados (using the C++ API). I'm 
allocating and using my own buffers, and would like to read and write 
directly into and from them. I'm using a bufferlist consisting of 
static_buffers, which are passed to Rados' aio_read and aio_write.

For aio_write, rados works as expected, i.e., the bufferlist is returned 
as it was before the call. However, when doing aio_read, it seems that 
the bufferlist is destroyed (not used) in the call, despite all the 
buffers being static.

Is this expected behaviour? I read a thread "read/write on RADOS using 
external buffer" from this mailing list from 2010, but wasn't able to 
figure out whether rados does or doesn't support reading into 
user-provided static_buffers.

Thanks in advance,
Cheers,

Rutger