ublk: grab request reference when the request is handled by userspace

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Add one reference counter into request pdu data, and hold this reference
in the request's lifetime.

Prepare for supporting to move request data copy into userspace, which
needs to copy request data by read()/write() on /dev/ublkcN, so we have
to guarantee that read()/write() is done on one valid/active request,
and that will be enhanced by holding the io request reference in
read()/write().

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230519065030.351216-5-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

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Ming Lei 2023-05-19 14:50:27 +08:00 • committed by Jens Axboe

parent 981f95a571

commit 8284066946

1 changed files with 64 additions and 3 deletions

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drivers/block/ublk_drv.c

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