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target: Add transport_cmd_check_stop write_pending bit
This patch adds a new transport_cmd_check_stop() parameter for signaling when TRANSPORT_WRITE_PENDING needs to be set. This allows transport_generic_new_cmd() to avoid the extra lock acquire/release of ->t_state_lock in the fast path for DMA_TO_DEVICE operations ahead of transport_cmd_check_stop() + se_tfo->write_pending(). Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@kernel.org> Cc: Kent Overstreet <koverstreet@google.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Moussa Ba <moussaba@micron.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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