Patch "target: Attach EXTENDED_COPY local I/O descriptors to xcopy_pt_sess" has been added to the 4.2-stable tree

This is a note to let you know that I've just added the patch titled

target: Attach EXTENDED_COPY local I/O descriptors to xcopy_pt_sess

to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
target-attach-extended_copy-local-i-o-descriptors-to-xcopy_pt_sess.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nicholas Bellinger <[email protected]>
Date: Thu, 3 Sep 2015 06:30:45 +0000
Subject: target: Attach EXTENDED_COPY local I/O descriptors to xcopy_pt_sess

From: Nicholas Bellinger <[email protected]>

commit 4416f89b8cfcb794d040fc3b68e5fb159b7d8d02 upstream.

This patch is a >= v4.1 regression bug-fix where control CDB emulation logic in commit 38b57f82 now expects a se_cmd->se_sess pointer to exist when determining T10-PI support is to be exposed for initiator host ports.

To address this bug, go ahead and add locally generated se_cmd descriptors for copy-offload block-copy to it's own stand-alone se_session nexus, while the parent EXTENDED_COPY se_cmd descriptor remains associated with it's originating se_cmd->se_sess nexus.

Note a valid se_cmd->se_sess is also required for future support of WRITE_INSERT and READ_STRIP software emulation when submitting backend I/O to se_device that exposes T10-PI suport.

---
 drivers/target/target_core_xcopy.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

@@ -450,6 +450,8 @@ int target_xcopy_setup_pt(void)
 	memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 	INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 	INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
+	INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
+	spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
 
 	xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 	xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;

@@ -644,7 +646,7 @@ static int target_xcopy_read_source(
 	pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 		(unsigned long long)src_lba, src_sectors, length);
 
-	transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
+	transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 			      DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 	xop->src_pt_cmd = xpt_cmd;
 

@@ -704,7 +706,7 @@ static int target_xcopy_write_destinatio
 	pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 		(unsigned long long)dst_lba, dst_sectors, length);
 
-	transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
+	transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 			      DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 	xop->dst_pt_cmd = xpt_cmd;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.2/target-iscsi-fix-np_ip-bracket-issue-by-removing-np_ip.patch queue-4.2/iser-target-put-the-reference-on-commands-waiting-for-unsol-data.patch queue-4.2/iser-target-remove-command-with-state-istate_remove.patch queue-4.2/target-attach-extended_copy-local-i-o-descriptors-to-xcopy_pt_sess.patch queue-4.2/target-fix-pr-registration-aptpl-rcu-conversion-regression.patch