From a6b0133c19af1ab268ed1f4414efa2782896a870 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@daterainc.com>
Date: Mon, 19 Aug 2013 14:34:17 -0700
Subject: target: Add return for se_cmd->transport_complete_callback
This patch adds a sense_reason_t return to ->transport_complete_callback(),
and updates target_complete_ok_work() to invoke the call if necessary to
transport_send_check_condition_and_sense() during the failure case.
Also update xdreadwrite_callback() to use this return value.
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>
---
drivers/target/target_core_sbc.c | 13 ++++++++-----
drivers/target/target_core_transport.c | 20 +++++++++++++++++---
2 files changed, 25 insertions(+), 8 deletions(-)
(limited to 'drivers/target')
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 8a462773d0c8..be5234abb76c 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -280,13 +280,13 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *o
return 0;
}
-static void xdreadwrite_callback(struct se_cmd *cmd)
+static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
{
unsigned char *buf, *addr;
struct scatterlist *sg;
unsigned int offset;
- int i;
- int count;
+ sense_reason_t ret = TCM_NO_SENSE;
+ int i, count;
/*
* From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
*
@@ -301,7 +301,7 @@ static void xdreadwrite_callback(struct se_cmd *cmd)
buf = kmalloc(cmd->data_length, GFP_KERNEL);
if (!buf) {
pr_err("Unable to allocate xor_callback buf\n");
- return;
+ return TCM_OUT_OF_RESOURCES;
}
/*
* Copy the scatterlist WRITE buffer located at cmd->t_data_sg
@@ -320,8 +320,10 @@ static void xdreadwrite_callback(struct se_cmd *cmd)
offset = 0;
for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
addr = kmap_atomic(sg_page(sg));
- if (!addr)
+ if (!addr) {
+ ret = TCM_OUT_OF_RESOURCES;
goto out;
+ }
for (i = 0; i < sg->length; i++)
*(addr + sg->offset + i) ^= *(buf + offset + i);
@@ -332,6 +334,7 @@ static void xdreadwrite_callback(struct se_cmd *cmd)
out:
kfree(buf);
+ return ret;
}
sense_reason_t
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 98ec7110873b..53d1d756f7f5 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1904,10 +1904,24 @@ static void target_complete_ok_work(struct work_struct *work)
}
/*
* Check for a callback, used by amongst other things
- * XDWRITE_READ_10 emulation.
+ * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
*/
- if (cmd->transport_complete_callback)
- cmd->transport_complete_callback(cmd);
+ if (cmd->transport_complete_callback) {
+ sense_reason_t rc;
+
+ rc = cmd->transport_complete_callback(cmd);
+ if (!rc)
+ return;
+
+ 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;
+ }
switch (cmd->data_direction) {
case DMA_FROM_DEVICE:
--
cgit