target: Add SCF_ACK_KREF flag for acknowledgement kref
When TARGET_SCF_ACK_KREF is in use with target_submit_cmd() for setting the extra acknowledgement reference to se_cmd->cmd_kref, go ahead and set SCF_ACK_KREF in order to be used later by abort task. Reported-by: NRoland Dreier <roland@purestorage.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>
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