Matthew Wilcox eeee322647
NVMe: Handle failures differently in nvme_submit_bio_queue() ...
Return -EBUSY if the queue is full or -ENOMEM if we failed to allocate
memory (or map a scatterlist). Also use GFP_ATOMIC to allocate the
nvme_bio and move the locking to the callers of nvme_submit_bio_queue().
In nvme_make_request(), don't permit an I/O to jump the queue -- if the
congestion list already has an entry, just add to the tail, rather than
trying to submit.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com >
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