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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 4416f89b8cfcb794d040fc3b68e5fb159b7d8d02 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
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 <nab@xxxxxxxxxxxxxxx>
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.
Reported-by: Alex Gorbachev <ag@xxxxxxxxxxxxxxxxxxx>
Tested-by: Alex Gorbachev <ag@xxxxxxxxxxxxxxxxxxx>
Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Doug Gilbert <dgilbert@xxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/target_core_xcopy.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/target/target_core_xcopy.c
+++ b/drivers/target/target_core_xcopy.c
@@ -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 nab@xxxxxxxxxxxxxxx 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
--
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