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"Andreas" == Andreas Dilger [off-list ref] writes:

Andreas> Is there a description of sys_dio() somewhere?

This was the original draft:

	http://www.spinics.net/lists/linux-mm/msg14512.html


Andreas> In particular, I'm interested to know whether it allows full
Andreas> scatter-gather IO submission, unlike pwrite() which only allows
Andreas> multiple input buffers, and not multiple file offsets.

Each request descriptor contains buffer, target file, and offset. So
it's a single entry per descriptor. But many descriptors can be
submitted (and reaped) in a single syscall. So you don't have the single
file offset limitation of pwritev().

-- 
Martin K. Petersen	Oracle Linux Engineering