linux-kernel - [PATCH-v3 12/13] target: Add compare_and_write

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Date:	Mon, 26 Aug 2013 21:13:45 +0000
From:	"Nicholas A. Bellinger" <nab@...erainc.com>
To:	target-devel <target-devel@...r.kernel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Martin Petersen <martin.petersen@...cle.com>,
	Chris Mason <chris.mason@...ionio.com>,
	Roland Dreier <roland@...estorage.com>,
	Kent Overstreet <kmo@...erainc.com>,
	James Bottomley <JBottomley@...allels.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Nicholas Bellinger <nab@...erainc.com>
Subject: [PATCH-v3 12/13] target: Add compare_and_write_post() completion callback fall through

From: Nicholas Bellinger <nab@...erainc.com>

This patch changes target_complete_ok_work() to fall through
after calling the se_cmd->transport_complete_callback() ->
compare_and_write_post() callback, by keying off the existance
of SCF_COMPARE_AND_WRITE_POST.

This is necessary because once SCF_COMPARE_AND_WRITE_POST has
been set by compare_and_write_post(), the SCSI response needs
to be sent via TFO->queue_status().

Cc: Christoph Hellwig <hch@....de>
Cc: Hannes Reinecke <hare@...e.de>
Cc: Martin Petersen <martin.petersen@...cle.com>
Cc: Chris Mason <chris.mason@...ionio.com>
Cc: James Bottomley <JBottomley@...allels.com>
Cc: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@...erainc.com>
---
 drivers/target/target_core_sbc.c       |    3 ++-
 drivers/target/target_core_transport.c |   19 ++++++++++---------
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 4076828..bb1b42b 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -375,7 +375,8 @@ static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
 	buf = kzalloc(cmd->data_length, GFP_KERNEL);
 	if (!buf) {
 		pr_err("Unable to allocate compare_and_write buf\n");
-		return TCM_OUT_OF_RESOURCES;
+		ret = TCM_OUT_OF_RESOURCES;
+		goto out;
 	}
 
 	write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 672cb37..e53c59b 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1909,17 +1909,18 @@ static void target_complete_ok_work(struct work_struct *work)
 		sense_reason_t rc;
 
 		rc = cmd->transport_complete_callback(cmd);
-		if (!rc)
+		if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
 			return;
+		} else if (rc) {
+			ret = transport_send_check_condition_and_sense(cmd,
+						rc, 0);
+			if (ret == -EAGAIN || ret == -ENOMEM)
+				goto queue_full;
 
-		ret = transport_send_check_condition_and_sense(cmd,
-					rc, 0);
-		if (ret == -EAGAIN || ret == -ENOMEM)
-			goto queue_full;
-
-		transport_lun_remove_cmd(cmd);
-		transport_cmd_check_stop_to_fabric(cmd);
-		return;
+			transport_lun_remove_cmd(cmd);
+			transport_cmd_check_stop_to_fabric(cmd);
+			return;
+		}
 	}
 
 	switch (cmd->data_direction) {
-- 
1.7.2.5

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