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authorNicholas Bellinger <nab@linux-iscsi.org>2016-03-04 22:30:52 -0800
committerNicholas Bellinger <nab@linux-iscsi.org>2016-03-10 22:36:12 -0800
commit4347ab5a086efcba449e7a6f0a14d1474060006b (patch)
tree431fe7029258a79e4f3c73df8ecf0ece784770a6 /drivers/target
parent32c76de3466ed2a875e36c140ac4e3800fdfab6e (diff)
downloadlinux-4347ab5a086efcba449e7a6f0a14d1474060006b.tar.bz2
target: Avoid DataIN transfers for non-GOOD SAM status
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 Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Andy Grover <agrover@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_transport.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index f5ad9e063b65..784dd22d33a3 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)