From: Nicholas Bellinger <[email protected]> This patch modifies existing transport_complete_*() code to avoid invoking target_core_fabric_ops->queue_data_in() driver callbacks for I/O READs with non-GOOD SAM status.
Some initiators expect GOOD status when a DATA-IN payload transfer is involved, so to be safe go ahead and always invoke target_core_fabric_ops->queue_status() to generate fabric responses instead. Note this is a prerequisite for IBLOCK supporting retriable status, so SAM_STAT_BUSY + SAM_STAT_TASK_SET_FULL always generates fabric driver responses instead of initiating DataIN payload transfer when non-GOOD status is present Cc: Christoph Hellwig <[email protected]> Cc: Hannes Reinecke <[email protected]> Cc: Sagi Grimberg <[email protected]> Cc: Andy Grover <[email protected]> Cc: Mike Christie <[email protected]> Signed-off-by: Nicholas Bellinger <[email protected]> --- drivers/target/target_core_transport.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index f5ad9e0..784dd22 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1997,6 +1997,9 @@ static void transport_complete_qf(struct se_cmd *cmd) switch (cmd->data_direction) { case DMA_FROM_DEVICE: + if (cmd->scsi_status) + goto queue_status; + trace_target_cmd_complete(cmd); ret = cmd->se_tfo->queue_data_in(cmd); break; @@ -2007,6 +2010,7 @@ static void transport_complete_qf(struct se_cmd *cmd) } /* Fall through for DMA_TO_DEVICE */ case DMA_NONE: +queue_status: trace_target_cmd_complete(cmd); ret = cmd->se_tfo->queue_status(cmd); break; @@ -2128,6 +2132,9 @@ static void target_complete_ok_work(struct work_struct *work) queue_rsp: switch (cmd->data_direction) { case DMA_FROM_DEVICE: + if (cmd->scsi_status) + goto queue_status; + atomic_long_add(cmd->data_length, &cmd->se_lun->lun_stats.tx_data_octets); /* @@ -2167,6 +2174,7 @@ queue_rsp: } /* Fall through for DMA_TO_DEVICE */ case DMA_NONE: +queue_status: trace_target_cmd_complete(cmd); ret = cmd->se_tfo->queue_status(cmd); if (ret == -EAGAIN || ret == -ENOMEM) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
