APIs to submit bios at block layer

[KASHISH BHATIA]

Hi all,

Could anyone explain the difference between submit_bio() and
generic_make_request() ?
How they are different in functionality?
How lower layers treat bios submitted via submit_bio() /
generic_make_request() ?
When is it preferable to use api generic_make_request() than submit_bio()
api?

-- 

Regards,
Kashish Bhatia
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