Caleb Sander Mateos bfe1255712
ublk: optimize ublk_user_copy() on daemon task ...
ublk user copy syscalls may be issued from any task, so they take a
reference count on the struct ublk_io to check whether it is owned by
the ublk server and prevent a concurrent UBLK_IO_COMMIT_AND_FETCH_REQ
from completing the request. However, if the user copy syscall is issued
on the io's daemon task, a concurrent UBLK_IO_COMMIT_AND_FETCH_REQ isn't
possible, so the atomic reference count dance is unnecessary. Check for
UBLK_IO_FLAG_OWNED_BY_SRV to ensure the request is dispatched to the
sever and obtain the request from ublk_io's req field instead of looking
it up on the tagset. Skip the reference count increment and decrement.
Commit 8a8fe42d76csander@purestorage.com >
Reviewed-by: Ming Lei <ming.lei@redhat.com >
Signed-off-by: Jens Axboe <axboe@kernel.dk >
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bfe1255712