From: Nicholas Bellinger <n...@daterainc.com>
This patch updates transport_generic_new_cmd() to call target_alloc_sgl()
for SGL + page memory allocation for se_cmd->t_bidi_data_sg.
It also adds the special case for SCF_COMPARE_AND_WRITE to calculate a
different bidi_length based upon se_cmd->t_task_nolb.
Reported-by: Christoph Hellwig <h...@lst.de>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Hannes Reinecke <h...@suse.de>
Cc: Martin Petersen <martin.peter...@oracle.com>
Cc: Chris Mason <chris.ma...@fusionio.com>
Cc: James Bottomley <jbottom...@parallels.com>
Cc: Nicholas Bellinger <n...@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <n...@daterainc.com>
---
drivers/target/target_core_transport.c | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/drivers/target/target_core_transport.c
b/drivers/target/target_core_transport.c
index 607bc3d..c974e13 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2149,6 +2149,23 @@ transport_generic_new_cmd(struct se_cmd *cmd)
cmd->data_length) {
bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
+ if ((cmd->se_cmd_flags & SCF_BIDI) ||
+ (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
+ u32 bidi_length;
+
+ if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
+ bidi_length = cmd->t_task_nolb *
+
cmd->se_dev->dev_attrib.block_size;
+ else
+ bidi_length = cmd->data_length;
+
+ ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
+ &cmd->t_bidi_data_nents,
+ bidi_length, zero_flag);
+ if (ret < 0)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
+
ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
cmd->data_length, zero_flag);
if (ret < 0)
--
1.7.2.5
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