NVMe: Initial PRP List support
Add a pointer to the nvme_req_info to hold a new data structure
(nvme_prps) which contains a list of the pages allocated to this
particular request for holding PRP list entries. nvme_setup_prps()
now returns this pointer.
To allocate and free the memory used for PRP lists, we need a struct
device, so we need to pass the nvme_queue pointer to many functions
which didn't use to need it.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
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