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authorNicholas Bellinger <nab@daterainc.com>2013-08-25 16:10:57 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2013-09-09 14:29:32 -0700
commit8cefe07b5e9c2b0212ad6809a219e4489807a746 (patch)
tree7396ced8cbb14370c506479a307a38790e41a7be /drivers/target/target_core_transport.c
parent200939940e040fa11609956a09c78a5782310c61 (diff)
target: Do memory allocation for bidi commands using target_alloc_sgl
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 <hch@lst.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Martin Petersen <martin.petersen@oracle.com> Cc: Chris Mason <chris.mason@fusionio.com> Cc: James Bottomley <JBottomley@Parallels.com> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
Diffstat (limited to 'drivers/target/target_core_transport.c')
-rw-r--r--drivers/target/target_core_transport.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 607bc3d2bb40..c974e1373c77 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)