[Lustre-discuss] copy_user_generic_c ?

[Roger Spellman]

Andreas,
Thanks for this information.
But, I'm seeing this problem on an OST, not on a client.  Why would an OST be doing copy_to/from_user()?  On a write, the IB card should be directly placing the data.  So, shouldn't the data already be in kernel space?
Thanks.
-Roger

>This is a well-known problem - this kernel function is copying data
>from userspace to the kernel buffers on a write, and vice versa on
>a read.  
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