dm: optimize bio-based NVMe IO submission

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Upper level bio-based drivers that stack immediately ontop of NVMe can
leverage direct_make_request().  In addition DM's NVMe bio-based
will initially only ever have one NVMe device that it submits IO to at a
time.  There is no splitting needed.  Enhance DM core so that
DM_TYPE_NVME_BIO_BASED's IO submission takes advantage of both of these
characteristics.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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This commit is contained in:

Mike Snitzer 2017-12-09 15:16:42 -05:00

parent 22c11858e8

commit 978e51ba38

1 changed files with 120 additions and 34 deletions

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drivers/md/dm.c

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