From c9abb9bb0b8451588509192bd53005d65c02986c Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Tue, 25 Oct 2011 06:43:29 +0000
Subject: [PATCH 01/20] target: Fix compile warning w/ missing module.h include
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This patch fixes the following compile warning in target_core_cdb.c in
recent linux-next code due to the new use of EXPORT_SYMBOL() for
target_get_task_cdb().
drivers/target/target_core_cdb.c:1316: warning: data definition has no type or storage class
drivers/target/target_core_cdb.c:1316: warning: type defaults to ‘int’ in declaration of ‘EXPORT_SYMBOL’
drivers/target/target_core_cdb.c:1316: warning: parameter names (without types) in function declaration
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_cdb.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 575cf7216f52..38535eb13929 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -24,6 +24,7 @@
*/
#include <linux/kernel.h>
+#include <linux/module.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
From 8cd79f24350826b81e16990d9e12bc878e67d385 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Mon, 24 Oct 2011 13:35:37 -0700
Subject: [PATCH 02/20] tcm_loop: Add explict read buffer memset for
SCF_SCSI_CONTROL_SG_IO_CDB
This patch addresses an issue with buggy userspace code sending I/O
via scsi-generic that does not explictly clear their associated read
buffers. It adds an explict memset of the first SGL entry within
tcm_loop_new_cmd_map() for SCF_SCSI_CONTROL_SG_IO_CDB payloads that
are currently guaranteed to be a single SGL by target-core code.
This issue is a side effect of the v3.1-rc1 merge to remove the
extra memcpy between certain control CDB types using a contigious
+ cleared buffer in target-core, and performing a memcpy into the
SGL list within tcm_loop.
It was originally mainfesting itself by udev + scsi_id + scsi-generic
not properly setting up the expected /dev/disk/by-id/ symlinks because
the INQUIRY payload was containing extra bogus data preventing the
proper NAA IEEE WWN from being parsed by userspace.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/loopback/tcm_loop.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index b15d8cbf630b..3c9c318f66ed 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -174,6 +174,24 @@ static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
sgl_bidi = sdb->table.sgl;
sgl_bidi_count = sdb->table.nents;
}
+ /*
+ * Because some userspace code via scsi-generic do not memset their
+ * associated read buffers, go ahead and do that here for type
+ * SCF_SCSI_CONTROL_SG_IO_CDB. Also note that this is currently
+ * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB
+ * by target core in transport_generic_allocate_tasks() ->
+ * transport_generic_cmd_sequencer().
+ */
+ if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB &&
+ se_cmd->data_direction == DMA_FROM_DEVICE) {
+ struct scatterlist *sg = scsi_sglist(sc);
+ unsigned char *buf = kmap(sg_page(sg)) + sg->offset;
+
+ if (buf != NULL) {
+ memset(buf, 0, sg->length);
+ kunmap(sg_page(sg));
+ }
+ }
/* Tell the core about our preallocated memory */
ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc),
From f147abb475ab47ce620cf3d18de5b3192c9fa7ed Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Tue, 25 Oct 2011 23:57:41 -0700
Subject: [PATCH 03/20] target: Check -ENOMEM to signal QUEUE_FULL from fabric
callbacks
This patch changes target core to also check for -ENOMEM from fabric callbacks
to signal QUEUE_FULL status, instead of just -EAGAIN in order to catch a
larger set of fabric failure cases that want to trigger QUEUE_FULL logic.
This includes the callbacks for ->write_pending(), ->queue_data_in() and
->queue_status().
It also makes transport_generic_write_pending() return zero upon QUEUE_FULL,
and removes two unnecessary -EAGAIN checks to catch write pending QUEUE_FULL
cases from transport_generic_new_cmd() failures in transport_handle_cdb_direct()
and transport_processing_thread():TRANSPORT_NEW_CMD_MAP state.
Reported-by: Bart Van Assche <bvanassche@acm.org>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_transport.c | 31 +++++++++++++-------------
1 file changed, 15 insertions(+), 16 deletions(-)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index d75255804481..5dee44639f8f 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -908,7 +908,7 @@ void transport_remove_task_from_execute_queue(
}
/*
- * Handle QUEUE_FULL / -EAGAIN status
+ * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
*/
static void target_qf_do_work(struct work_struct *work)
@@ -1645,9 +1645,7 @@ int transport_handle_cdb_direct(
* and call transport_generic_request_failure() if necessary..
*/
ret = transport_generic_new_cmd(cmd);
- if (ret == -EAGAIN)
- return 0;
- else if (ret < 0) {
+ if (ret < 0) {
cmd->transport_error_status = ret;
transport_generic_request_failure(cmd, 0,
(cmd->data_direction != DMA_TO_DEVICE));
@@ -1886,7 +1884,7 @@ static void transport_generic_request_failure(
ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
ret = cmd->se_tfo->queue_status(cmd);
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
goto check_stop;
case PYX_TRANSPORT_USE_SENSE_REASON:
@@ -1913,7 +1911,7 @@ static void transport_generic_request_failure(
else {
ret = transport_send_check_condition_and_sense(cmd,
cmd->scsi_sense_reason, 0);
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
}
@@ -3308,7 +3306,7 @@ static void target_complete_ok_work(struct work_struct *work)
if (cmd->scsi_status) {
ret = transport_send_check_condition_and_sense(
cmd, reason, 1);
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
transport_lun_remove_cmd(cmd);
@@ -3333,7 +3331,7 @@ static void target_complete_ok_work(struct work_struct *work)
spin_unlock(&cmd->se_lun->lun_sep_lock);
ret = cmd->se_tfo->queue_data_in(cmd);
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
break;
case DMA_TO_DEVICE:
@@ -3354,14 +3352,14 @@ static void target_complete_ok_work(struct work_struct *work)
}
spin_unlock(&cmd->se_lun->lun_sep_lock);
ret = cmd->se_tfo->queue_data_in(cmd);
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
break;
}
/* Fall through for DMA_TO_DEVICE */
case DMA_NONE:
ret = cmd->se_tfo->queue_status(cmd);
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
break;
default:
@@ -3890,7 +3888,10 @@ EXPORT_SYMBOL(transport_generic_process_write);
static void transport_write_pending_qf(struct se_cmd *cmd)
{
- if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
+ int ret;
+
+ ret = cmd->se_tfo->write_pending(cmd);
+ if (ret == -EAGAIN || ret == -ENOMEM) {
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
cmd);
transport_handle_queue_full(cmd, cmd->se_dev);
@@ -3920,7 +3921,7 @@ static int transport_generic_write_pending(struct se_cmd *cmd)
* frontend know that WRITE buffers are ready.
*/
ret = cmd->se_tfo->write_pending(cmd);
- if (ret == -EAGAIN)
+ if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
else if (ret < 0)
return ret;
@@ -3931,7 +3932,7 @@ queue_full:
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
transport_handle_queue_full(cmd, cmd->se_dev);
- return ret;
+ return 0;
}
/**
@@ -4583,9 +4584,7 @@ get_cmd:
break;
}
ret = transport_generic_new_cmd(cmd);
- if (ret == -EAGAIN)
- break;
- else if (ret < 0) {
+ if (ret < 0) {
cmd->transport_error_status = ret;
transport_generic_request_failure(cmd,
0, (cmd->data_direction !=
From 80ccbc8e00f7001d79dd503c2781487906b98611 Mon Sep 17 00:00:00 2001
From: Joern Engel <joern@logfs.org>
Date: Tue, 25 Oct 2011 22:08:43 -0700
Subject: [PATCH 04/20] target: Fix incorrect se_cmd assignment in
core_tmr_drain_tmr_list
This patch fixes a bug in core_tmr_drain_tmr_list() where drain_tmr_list
was using the wrong se_tmr_req for cmd assignment due to a typo during the
LUN_RESET re-org. This was resulting in general protection faults while
using the leftover bogus *tmr_p pointer from list_for_each_entry_safe().
Signed-off-by: Joern Engel <joern@logfs.org>
Cc: Joern Engel <joern@logfs.org>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_tmr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index 570b144a1edb..87d8e958b4ce 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -154,7 +154,7 @@ static void core_tmr_drain_tmr_list(
while (!list_empty(&drain_tmr_list)) {
tmr = list_entry(drain_tmr_list.next, struct se_tmr_req, tmr_list);
list_del(&tmr->tmr_list);
- cmd = tmr_p->task_cmd;
+ cmd = tmr->task_cmd;
pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
" Response: 0x%02x, t_state: %d\n",
From 6eb40b2af4908e9aee71e43e7a384243128c56dd Mon Sep 17 00:00:00 2001
From: Joern Engel <joern@logfs.org>
Date: Wed, 26 Oct 2011 13:37:56 -0700
Subject: [PATCH 05/20] target: Fix wrong se_tmr being added to drain_tmr_list
This patch fixes another bug from LUN_RESET re-org fallout in
core_tmr_drain_tmr_list() that was adding the wrong se_tmr_req
into the local drain_tmr_list to be walked + released.
Signed-off-by: Joern Engel <joern@logfs.org>
Cc: Joern Engel <joern@logfs.org>
Reviewed-by: Roland Dreier <roland@purestorage.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_tmr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index 87d8e958b4ce..391d6d8ac962 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -147,7 +147,7 @@ static void core_tmr_drain_tmr_list(
}
spin_unlock(&cmd->t_state_lock);
- list_move_tail(&tmr->tmr_list, &drain_tmr_list);
+ list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
}
spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
From abc1fd4f92d86168790a9eaf9834713a41da788e Mon Sep 17 00:00:00 2001
From: Joern Engel <joern@logfs.org>
Date: Wed, 26 Oct 2011 14:22:19 -0700
Subject: [PATCH 06/20] target: Minor cleanups to core_tmr_drain_tmr_list
This patch adds a handful minor cleanups to core_tmr_drain_tmr_list() that
remove an unnecessary NULL check, use list_for_each_entry_safe() instead of
list_entry(), and makes the drain_tmr_list walk use *tmr_p instead of
directly referencing the passed *tmr function parameter.
Signed-off-by: Joern Engel <joern@logfs.org>
Cc: Joern Engel <joern@logfs.org>
Reviewed-by: Roland Dreier <roland@purestorage.com>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_tmr.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index 391d6d8ac962..2b0c528c1dd9 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -118,7 +118,7 @@ static void core_tmr_drain_tmr_list(
/*
* Allow the received TMR to return with FUNCTION_COMPLETE.
*/
- if (tmr && (tmr_p == tmr))
+ if (tmr_p == tmr)
continue;
cmd = tmr_p->task_cmd;
@@ -151,15 +151,14 @@ static void core_tmr_drain_tmr_list(
}
spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
- while (!list_empty(&drain_tmr_list)) {
- tmr = list_entry(drain_tmr_list.next, struct se_tmr_req, tmr_list);
- list_del(&tmr->tmr_list);
- cmd = tmr->task_cmd;
+ list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
+ list_del(&tmr_p->tmr_list);
+ cmd = tmr_p->task_cmd;
pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
" Response: 0x%02x, t_state: %d\n",
- (preempt_and_abort_list) ? "Preempt" : "", tmr,
- tmr->function, tmr->response, cmd->t_state);
+ (preempt_and_abort_list) ? "Preempt" : "", tmr_p,
+ tmr_p->function, tmr_p->response, cmd->t_state);
transport_cmd_finish_abort(cmd, 1);
}
From b8a11d7399173dcf23b6d0ca4f416bdf1eba982e Mon Sep 17 00:00:00 2001
From: Joern Engel <joern@logfs.org>
Date: Thu, 27 Oct 2011 15:44:46 -0700
Subject: [PATCH 07/20] target: Avoid double list_del for aborted se_tmr_req
After the list_del() in core_tmr_drain_tmr_list(),
core_tmr_release_req() would list_del() the same object again.
Call graph:
core_tmr_drain_tmr_list
transport_cmd_finish_abort_tmr
transport_generic_remove
transport_free_se_cmd
core_tmr_release_req
So use list_del_init(), as list_del() of an initialized list_head is
safe and essentially a nop. In the CONFIG_DEBUG_LIST case, list_del()
actually poisons the list_head, but that is fine as we free the object
directly afterwards.
Signed-off-by: Joern Engel <joern@logfs.org>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
---
drivers/target/target_core_tmr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index 2b0c528c1dd9..b1b9f2d6f935 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -152,7 +152,7 @@ static void core_tmr_drain_tmr_list(
spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
- list_del(&tmr_p->tmr_list);
+ list_del_init(&tmr_p->tmr_list);
cmd = tmr_p->task_cmd;
pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
From 7e32da55e26b80d57961681e53aa67938268db3f Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Fri, 28 Oct 2011 13:32:35 -0700
Subject: [PATCH 08/20] iscsi-target: Add missing CMDSN_LOWER_THAN_EXP check in
iscsit_handle_scsi_cmd
This patch adds a missing CMDSN_LOWER_THAN_EXP return check for
iscsit_sequence_cmd() in iscsit_handle_scsi_cmd() that was incorrectly
dropped during the v3.1-rc cleanups to use iscsit_sequence_cmd().
Cc: Andy Grover <agrover@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/iscsi/iscsi_target.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 4d01768fcd90..7855a63d49fc 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1079,7 +1079,9 @@ attach_cmd:
*/
if (!cmd->immediate_data) {
cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
- if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
+ if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
+ return 0;
+ else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
From 5a4c8666c6d576f076a7c6824589cdbb984c0f84 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Fri, 28 Oct 2011 13:37:19 -0700
Subject: [PATCH 09/20] iscsi-target: Fix non-immediate TMR handling
This patch addresses two issues with non immediate TMR handling in
iscsit_handle_task_mgt_cmd(). The first involves breakage due to
v3.1-rc conversion of iscsit_sequence_cmd(), which upon good status
would hit the iscsit_add_reject_from_cmd() block of code. This patch
adds an explict check for CMDSN_ERROR_CANNOT_RECOVER.
The second adds a check to return when non immediate TMR operation is
detected after iscsit_ack_from_expstatsn(), as iscsit_sequence_cmd()
-> iscsit_execute_cmd() will have called transport_generic_handle_tmr()
for the non immediate TMR case already.
Cc: Andy Grover <agrover@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/iscsi/iscsi_target.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 7855a63d49fc..1bf057ed9931 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1821,17 +1821,16 @@ attach:
int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
out_of_order_cmdsn = 1;
- else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+ else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
return 0;
- } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */
+ else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
return iscsit_add_reject_from_cmd(
ISCSI_REASON_PROTOCOL_ERROR,
1, 0, buf, cmd);
- }
}
iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
- if (out_of_order_cmdsn)
+ if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
return 0;
/*
* Found the referenced task, send to transport for processing.
From 88dd9e26d6d3e743f9c7e4562b94b2ad3c2994d3 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed, 2 Nov 2011 03:33:16 -0700
Subject: [PATCH 10/20] target: Make TFO->check_stop_free return free status
This patch converts target_core_fabric_ops->check_stop_free() usage in
transport_cmd_check_stop() and associated fabric module usage to
return '1' when the passed se_cmd has been released directly within
->check_stop_free(), or return '0' when the passed se_cmd has not
been released.
This addresses an issue where transport_cmd_finish_abort() ->
transport_cmd_check_stop_to_fabric() was leaking descriptors during
LUN_RESET for modules using ->check_stop_free(), but not directly
releasing se_cmd in all cases.
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
---
drivers/target/loopback/tcm_loop.c | 5 +++--
drivers/target/target_core_transport.c | 7 +++++--
drivers/target/tcm_fc/tcm_fc.h | 2 +-
drivers/target/tcm_fc/tfc_cmd.c | 3 ++-
include/target/target_core_fabric_ops.h | 7 +++++--
5 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 3c9c318f66ed..3df1c9b8ae6b 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -205,7 +205,7 @@ static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
/*
* Called from struct target_core_fabric_ops->check_stop_free()
*/
-static void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
+static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
{
/*
* Do not release struct se_cmd's containing a valid TMR
@@ -213,12 +213,13 @@ static void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
* with transport_generic_free_cmd().
*/
if (se_cmd->se_tmr_req)
- return;
+ return 0;
/*
* Release the struct se_cmd, which will make a callback to release
* struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
*/
transport_generic_free_cmd(se_cmd, 0);
+ return 1;
}
static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 5dee44639f8f..bf8867f44021 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -514,13 +514,16 @@ static int transport_cmd_check_stop(
* Some fabric modules like tcm_loop can release
* their internally allocated I/O reference now and
* struct se_cmd now.
+ *
+ * Fabric modules are expected to return '1' here if the
+ * se_cmd being passed is released at this point,
+ * or zero if not being released.
*/
if (cmd->se_tfo->check_stop_free != NULL) {
spin_unlock_irqrestore(
&cmd->t_state_lock, flags);
- cmd->se_tfo->check_stop_free(cmd);
- return 1;
+ return cmd->se_tfo->check_stop_free(cmd);
}
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
diff --git a/drivers/target/tcm_fc/tcm_fc.h b/drivers/target/tcm_fc/tcm_fc.h
index 3749d8b4b423..e05c55100ec6 100644
--- a/drivers/target/tcm_fc/tcm_fc.h
+++ b/drivers/target/tcm_fc/tcm_fc.h
@@ -156,7 +156,7 @@ int ft_lport_notify(struct notifier_block *, unsigned long, void *);
/*
* IO methods.
*/
-void ft_check_stop_free(struct se_cmd *);
+int ft_check_stop_free(struct se_cmd *);
void ft_release_cmd(struct se_cmd *);
int ft_queue_status(struct se_cmd *);
int ft_queue_data_in(struct se_cmd *);
diff --git a/drivers/target/tcm_fc/tfc_cmd.c b/drivers/target/tcm_fc/tfc_cmd.c
index 6195026cc7b0..4fac37c4c615 100644
--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -112,9 +112,10 @@ void ft_release_cmd(struct se_cmd *se_cmd)
ft_free_cmd(cmd);
}
-void ft_check_stop_free(struct se_cmd *se_cmd)
+int ft_check_stop_free(struct se_cmd *se_cmd)
{
transport_generic_free_cmd(se_cmd, 0);
+ return 1;
}
/*
diff --git a/include/target/target_core_fabric_ops.h b/include/target/target_core_fabric_ops.h
index 126c675f4f14..04c591da0844 100644
--- a/include/target/target_core_fabric_ops.h
+++ b/include/target/target_core_fabric_ops.h
@@ -46,9 +46,12 @@ struct target_core_fabric_ops {
int (*new_cmd_map)(struct se_cmd *);
/*
* Optional to release struct se_cmd and fabric dependent allocated
- * I/O descriptor in transport_cmd_check_stop()
+ * I/O descriptor in transport_cmd_check_stop().
+ *
+ * Returning 1 will signal a descriptor has been released.
+ * Returning 0 will signal a descriptor has not been released.
*/
- void (*check_stop_free)(struct se_cmd *);
+ int (*check_stop_free)(struct se_cmd *);
void (*release_cmd)(struct se_cmd *);
/*
* Called with spin_lock_bh(struct se_portal_group->session_lock held.
From 3151d069e9e77043b0e791719bc65896cf24d9f0 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed, 2 Nov 2011 08:28:20 -0700
Subject: [PATCH 11/20] target: Remove core TRANSPORT_FREE_CMD_INTR usage
This patch drops TRANSPORT_FREE_CMD_INTR usage from target core, which
includes the removal of transport_generic_free_cmd_intr() symbol,
TRANSPORT_FREE_CMD_INTR usage in transport_processing_thread(), and
special case LUN_RESET handling to skip TRANSPORT_FREE_CMD_INTR processing
in core_tmr_drain_cmd_list(). We now expect that fabric modules will
use an internal workqueue to provide process context when releasing
se_cmd descriptor resources via transport_generic_free_cmd().
Reported-by: Christoph Hellwig <hch@lst.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Madhuranath Iyengar <mni@risingtidesystems.com>
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>
---
drivers/target/target_core_tmr.c | 10 ----------
drivers/target/target_core_transport.c | 10 ----------
include/target/target_core_base.h | 1 -
include/target/target_core_transport.h | 1 -
4 files changed, 22 deletions(-)
diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index b1b9f2d6f935..1d2aaba3f372 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -329,16 +329,6 @@ static void core_tmr_drain_cmd_list(
*/
if (prout_cmd == cmd)
continue;
- /*
- * Skip direct processing of TRANSPORT_FREE_CMD_INTR for
- * HW target mode fabrics.
- */
- spin_lock(&cmd->t_state_lock);
- if (cmd->t_state == TRANSPORT_FREE_CMD_INTR) {
- spin_unlock(&cmd->t_state_lock);
- continue;
- }
- spin_unlock(&cmd->t_state_lock);
atomic_set(&cmd->t_transport_queue_active, 0);
atomic_dec(&qobj->queue_cnt);
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index bf8867f44021..64ee3342e0c2 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1718,13 +1718,6 @@ int transport_generic_handle_tmr(
}
EXPORT_SYMBOL(transport_generic_handle_tmr);
-void transport_generic_free_cmd_intr(
- struct se_cmd *cmd)
-{
- transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
-}
-EXPORT_SYMBOL(transport_generic_free_cmd_intr);
-
/*
* If the task is active, request it to be stopped and sleep until it
* has completed.
@@ -4597,9 +4590,6 @@ get_cmd:
case TRANSPORT_PROCESS_WRITE:
transport_generic_process_write(cmd);
break;
- case TRANSPORT_FREE_CMD_INTR:
- transport_generic_free_cmd(cmd, 0);
- break;
case TRANSPORT_PROCESS_TMR:
transport_generic_do_tmr(cmd);
break;
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 35aa786f93da..d571bcfd16ad 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -89,7 +89,6 @@ enum transport_state_table {
TRANSPORT_PROCESS_TMR = 9,
TRANSPORT_ISTATE_PROCESSING = 11,
TRANSPORT_NEW_CMD_MAP = 16,
- TRANSPORT_FREE_CMD_INTR = 17,
TRANSPORT_COMPLETE_QF_WP = 18,
TRANSPORT_COMPLETE_QF_OK = 19,
};
diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h
index a037a1a6fbba..d1b68c9ccb75 100644
--- a/include/target/target_core_transport.h
+++ b/include/target/target_core_transport.h
@@ -160,7 +160,6 @@ extern int transport_generic_handle_cdb_map(struct se_cmd *);
extern int transport_generic_handle_data(struct se_cmd *);
extern void transport_new_cmd_failure(struct se_cmd *);
extern int transport_generic_handle_tmr(struct se_cmd *);
-extern void transport_generic_free_cmd_intr(struct se_cmd *);
extern bool target_stop_task(struct se_task *task, unsigned long *flags);
extern int transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *, u32,
struct scatterlist *, u32);
From ed327ed337a6ee6919ee092c82ac3edeb63bd4de Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 2 Nov 2011 08:48:15 -0700
Subject: [PATCH 12/20] target/pscsi: blk_make_request() returns an ERR_PTR()
The check is wrong here because blk_make_request() returns an
ERR_PTR() and it doesn't return NULL.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_pscsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index dad671dee9e9..f941b6232614 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -1091,7 +1091,7 @@ static int pscsi_do_task(struct se_task *task)
req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
GFP_KERNEL);
- if (!req) {
+ if (IS_ERR(req)) {
pr_err("pSCSI: blk_make_request() failed\n");
goto fail;
}
From 2235007c4d3245c0eca5e49497aafe5a111c00fb Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Wed, 2 Nov 2011 05:06:35 -0700
Subject: [PATCH 13/20] target: add back error handling in
transport_complete_task
The commit
target: use a workqueue for I/O completions
accidentally removed setting t_tasks_failed in transport_complete_task.
Add it back in a slightly cleaner way; now it is set for every failed task
instead of special casing the last one completing by using the success
argument directly for it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_transport.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 64ee3342e0c2..81bc355be317 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -733,6 +733,10 @@ void transport_complete_task(struct se_task *task, int success)
complete(&task->task_stop_comp);
return;
}
+
+ if (!success)
+ cmd->t_tasks_failed = 1;
+
/*
* Decrement the outstanding t_task_cdbs_left count. The last
* struct se_task from struct se_cmd will complete itself into the
@@ -743,7 +747,7 @@ void transport_complete_task(struct se_task *task, int success)
return;
}
- if (!success || cmd->t_tasks_failed) {
+ if (cmd->t_tasks_failed) {
if (!task->task_error_status) {
task->task_error_status =
PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
From a17f091d1a7c570804cfc2c77701634da88f8ecf Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed, 2 Nov 2011 21:52:08 -0700
Subject: [PATCH 14/20] target: Add generic active I/O shutdown logic
This patch adds the initial pieces of generic active I/O shutdown logic.
This is intended to be a 'opt-in' feature for fabric modules that
includes the following functions to provide a mechinism for fabric
modules to track se_cmd via se_session->sess_cmd_list:
*) target_get_sess_cmd() - Add se_cmd to sess->sess_cmd_list, called
from fabric module incoming I/O path.
*) target_put_sess_cmd() - Check for completion or drop se_cmd from
->sess_cmd_list
*) target_splice_sess_cmd_list() - Splice active I/O list from
->sess_cmd_list to ->sess_wait_list, can called with HW fabric
lock held.
*) target_wait_for_sess_cmds() - Walk ->sess_wait_list waiting on
individual ->cmd_wait_comp. Optional transport_wait_for_tasks()
call.
target_splice_sess_cmd_list() is allowed to be called under HW fabric
lock, and performs the splice into se_sess->sess_wait_list and set
se_cmd->cmd_wait_set. Then target_wait_for_sess_cmds() walks the list
waiting for individual target_put_sess_cmd() fabric callbacks to
complete.
It also adds TFO->check_release_cmd() to split the completion and memory
release calls, where a fabric module uses target_put_sess_cmd() to check
for I/O completion during session shutdown. This is currently pushed out
into fabric modules as current fabric code may sleep here waiting for
TFO->check_stop_free() to complete in main response path, and because
target_wait_for_sess_cmds() calling TFO->release_cmd() to free fabric
descriptor memory directly.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_transport.c | 132 +++++++++++++++++++++++-
include/target/target_core_base.h | 9 ++
include/target/target_core_fabric_ops.h | 4 +
include/target/target_core_transport.h | 6 +-
4 files changed, 145 insertions(+), 6 deletions(-)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 81bc355be317..e84b26ffb17b 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -268,6 +268,9 @@ struct se_session *transport_init_session(void)
}
INIT_LIST_HEAD(&se_sess->sess_list);
INIT_LIST_HEAD(&se_sess->sess_acl_list);
+ INIT_LIST_HEAD(&se_sess->sess_cmd_list);
+ INIT_LIST_HEAD(&se_sess->sess_wait_list);
+ spin_lock_init(&se_sess->sess_cmd_lock);
return se_sess;
}
@@ -1505,11 +1508,12 @@ void transport_init_se_cmd(
INIT_LIST_HEAD(&cmd->se_ordered_node);
INIT_LIST_HEAD(&cmd->se_qf_node);
INIT_LIST_HEAD(&cmd->se_queue_node);
-
+ INIT_LIST_HEAD(&cmd->se_cmd_list);
INIT_LIST_HEAD(&cmd->t_task_list);
init_completion(&cmd->transport_lun_fe_stop_comp);
init_completion(&cmd->transport_lun_stop_comp);
init_completion(&cmd->t_transport_stop_comp);
+ init_completion(&cmd->cmd_wait_comp);
spin_lock_init(&cmd->t_state_lock);
atomic_set(&cmd->transport_dev_active, 1);
@@ -3950,6 +3954,14 @@ void transport_release_cmd(struct se_cmd *cmd)
core_tmr_release_req(cmd->se_tmr_req);
if (cmd->t_task_cdb != cmd->__t_task_cdb)
kfree(cmd->t_task_cdb);
+ /*
+ * Check if target_wait_for_sess_cmds() is expecting to
+ * release se_cmd directly here..
+ */
+ if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
+ if (cmd->se_tfo->check_release_cmd(cmd) != 0)
+ return;
+
cmd->se_tfo->release_cmd(cmd);
}
EXPORT_SYMBOL(transport_release_cmd);
@@ -3977,6 +3989,114 @@ void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
}
EXPORT_SYMBOL(transport_generic_free_cmd);
+/* target_get_sess_cmd - Add command to active ->sess_cmd_list
+ * @se_sess: session to reference
+ * @se_cmd: command descriptor to add
+ */
+void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
+ list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
+ se_cmd->check_release = 1;
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+}
+EXPORT_SYMBOL(target_get_sess_cmd);
+
+/* target_put_sess_cmd - Check for active I/O shutdown or list delete
+ * @se_sess: session to reference
+ * @se_cmd: command descriptor to drop
+ */
+int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
+ if (list_empty(&se_cmd->se_cmd_list)) {
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+ WARN_ON(1);
+ return 0;
+ }
+
+ if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+ complete(&se_cmd->cmd_wait_comp);
+ return 1;
+ }
+ list_del(&se_cmd->se_cmd_list);
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(target_put_sess_cmd);
+
+/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
+ * @se_sess: session to split
+ */
+void target_splice_sess_cmd_list(struct se_session *se_sess)
+{
+ struct se_cmd *se_cmd;
+ unsigned long flags;
+
+ WARN_ON(!list_empty(&se_sess->sess_wait_list));
+ INIT_LIST_HEAD(&se_sess->sess_wait_list);
+
+ spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
+ se_sess->sess_tearing_down = 1;
+
+ list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
+
+ list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
+ se_cmd->cmd_wait_set = 1;
+
+ spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
+}
+EXPORT_SYMBOL(target_splice_sess_cmd_list);
+
+/* target_wait_for_sess_cmds - Wait for outstanding descriptors
+ * @se_sess: session to wait for active I/O
+ * @wait_for_tasks: Make extra transport_wait_for_tasks call
+ */
+void target_wait_for_sess_cmds(
+ struct se_session *se_sess,
+ int wait_for_tasks)
+{
+ struct se_cmd *se_cmd, *tmp_cmd;
+ bool rc = false;
+
+ list_for_each_entry_safe(se_cmd, tmp_cmd,
+ &se_sess->sess_wait_list, se_cmd_list) {
+ list_del(&se_cmd->se_cmd_list);
+
+ pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
+ " %d\n", se_cmd, se_cmd->t_state,
+ se_cmd->se_tfo->get_cmd_state(se_cmd));
+
+ if (wait_for_tasks) {
+ pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
+ " fabric state: %d\n", se_cmd, se_cmd->t_state,
+ se_cmd->se_tfo->get_cmd_state(se_cmd));
+
+ rc = transport_wait_for_tasks(se_cmd);
+
+ pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
+ " fabric state: %d\n", se_cmd, se_cmd->t_state,
+ se_cmd->se_tfo->get_cmd_state(se_cmd));
+ }
+
+ if (!rc) {
+ wait_for_completion(&se_cmd->cmd_wait_comp);
+ pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
+ " fabric state: %d\n", se_cmd, se_cmd->t_state,
+ se_cmd->se_tfo->get_cmd_state(se_cmd));
+ }
+
+ se_cmd->se_tfo->release_cmd(se_cmd);
+ }
+}
+EXPORT_SYMBOL(target_wait_for_sess_cmds);
+
/* transport_lun_wait_for_tasks():
*
* Called from ConfigFS context to stop the passed struct se_cmd to allow
@@ -4153,14 +4273,14 @@ int transport_clear_lun_from_sessions(struct se_lun *lun)
* Called from frontend fabric context to wait for storage engine
* to pause and/or release frontend generated struct se_cmd.
*/
-void transport_wait_for_tasks(struct se_cmd *cmd)
+bool transport_wait_for_tasks(struct se_cmd *cmd)
{
unsigned long flags;
spin_lock_irqsave(&cmd->t_state_lock, flags);
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
+ return false;
}
/*
* Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
@@ -4168,7 +4288,7 @@ void transport_wait_for_tasks(struct se_cmd *cmd)
*/
if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
+ return false;
}
/*
* If we are already stopped due to an external event (ie: LUN shutdown)
@@ -4211,7 +4331,7 @@ void transport_wait_for_tasks(struct se_cmd *cmd)
if (!atomic_read(&cmd->t_transport_active) ||
atomic_read(&cmd->t_transport_aborted)) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- return;
+ return false;
}
atomic_set(&cmd->t_transport_stop, 1);
@@ -4236,6 +4356,8 @@ void transport_wait_for_tasks(struct se_cmd *cmd)
cmd->se_tfo->get_task_tag(cmd));
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+
+ return true;
}
EXPORT_SYMBOL(transport_wait_for_tasks);
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index d571bcfd16ad..dd245b68be5a 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -425,6 +425,9 @@ struct se_cmd {
enum transport_state_table t_state;
/* Transport specific error status */
int transport_error_status;
+ /* Used to signal cmd->se_tfo->check_release_cmd() usage per cmd */
+ int check_release:1;
+ int cmd_wait_set:1;
/* See se_cmd_flags_table */
u32 se_cmd_flags;
u32 se_ordered_id;
@@ -451,6 +454,8 @@ struct se_cmd {
struct se_session *se_sess;
struct se_tmr_req *se_tmr_req;
struct list_head se_queue_node;
+ struct list_head se_cmd_list;
+ struct completion cmd_wait_comp;
struct target_core_fabric_ops *se_tfo;
int (*transport_emulate_cdb)(struct se_cmd *);
void (*transport_complete_callback)(struct se_cmd *);
@@ -558,12 +563,16 @@ struct se_node_acl {
} ____cacheline_aligned;
struct se_session {
+ int sess_tearing_down:1;
u64 sess_bin_isid;
struct se_node_acl *se_node_acl;
struct se_portal_group *se_tpg;
void *fabric_sess_ptr;
struct list_head sess_list;
struct list_head sess_acl_list;
+ struct list_head sess_cmd_list;
+ struct list_head sess_wait_list;
+ spinlock_t sess_cmd_lock;
} ____cacheline_aligned;
struct se_device;
diff --git a/include/target/target_core_fabric_ops.h b/include/target/target_core_fabric_ops.h
index 04c591da0844..0256825f923d 100644
--- a/include/target/target_core_fabric_ops.h
+++ b/include/target/target_core_fabric_ops.h
@@ -52,6 +52,10 @@ struct target_core_fabric_ops {
* Returning 0 will signal a descriptor has not been released.
*/
int (*check_stop_free)(struct se_cmd *);
+ /*
+ * Optional check for active I/O shutdown
+ */
+ int (*check_release_cmd)(struct se_cmd *);
void (*release_cmd)(struct se_cmd *);
/*
* Called with spin_lock_bh(struct se_portal_group->session_lock held.
diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h
index d1b68c9ccb75..c16e9431dd01 100644
--- a/include/target/target_core_transport.h
+++ b/include/target/target_core_transport.h
@@ -164,12 +164,16 @@ extern bool target_stop_task(struct se_task *task, unsigned long *flags);
extern int transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *, u32,
struct scatterlist *, u32);
extern int transport_clear_lun_from_sessions(struct se_lun *);
-extern void transport_wait_for_tasks(struct se_cmd *);
+extern bool transport_wait_for_tasks(struct se_cmd *);
extern int transport_check_aborted_status(struct se_cmd *, int);
extern int transport_send_check_condition_and_sense(struct se_cmd *, u8, int);
extern void transport_send_task_abort(struct se_cmd *);
extern void transport_release_cmd(struct se_cmd *);
extern void transport_generic_free_cmd(struct se_cmd *, int);
+extern void target_get_sess_cmd(struct se_session *, struct se_cmd *);
+extern int target_put_sess_cmd(struct se_session *, struct se_cmd *);
+extern void target_splice_sess_cmd_list(struct se_session *);
+extern void target_wait_for_sess_cmds(struct se_session *, int);
extern void transport_generic_wait_for_cmds(struct se_cmd *, int);
extern void transport_do_task_sg_chain(struct se_cmd *);
extern void transport_generic_process_write(struct se_cmd *);
From eacac00ce5bfde8086cd0615fb53c986f7f970fe Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Thu, 3 Nov 2011 17:50:40 -0400
Subject: [PATCH 15/20] target: split core_scsi2_emulate_crh
Split core_scsi2_emulate_crh into one routine each for the reserve and
release side. The common code now is in a helper called by both
routines.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_pr.c | 189 ++++++++++++-------------
drivers/target/target_core_pr.h | 3 +-
drivers/target/target_core_transport.c | 16 +--
3 files changed, 102 insertions(+), 106 deletions(-)
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 0c4f783f924c..830953a743d6 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -116,14 +116,99 @@ static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
return ret;
}
-static int core_scsi2_reservation_release(struct se_cmd *cmd)
+static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
+ struct se_node_acl *, struct se_session *);
+static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
+
+static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd, int *ret)
+{
+ struct se_session *se_sess = cmd->se_sess;
+ struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
+ struct t10_pr_registration *pr_reg;
+ struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
+ int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
+ int conflict = 0;
+
+ if (!crh)
+ return false;
+
+ pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
+ se_sess);
+ if (pr_reg) {
+ /*
+ * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
+ * behavior
+ *
+ * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
+ * status, but no reservation shall be established and the
+ * persistent reservation shall not be changed, if the command
+ * is received from a) and b) below.
+ *
+ * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
+ * status, but the persistent reservation shall not be released,
+ * if the command is received from a) and b)
+ *
+ * a) An I_T nexus that is a persistent reservation holder; or
+ * b) An I_T nexus that is registered if a registrants only or
+ * all registrants type persistent reservation is present.
+ *
+ * In all other cases, a RESERVE(6) command, RESERVE(10) command,
+ * RELEASE(6) command, or RELEASE(10) command shall be processed
+ * as defined in SPC-2.
+ */
+ if (pr_reg->pr_res_holder) {
+ core_scsi3_put_pr_reg(pr_reg);
+ *ret = 0;
+ return false;
+ }
+ if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
+ (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
+ (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
+ (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
+ core_scsi3_put_pr_reg(pr_reg);
+ *ret = 0;
+ return true;
+ }
+ core_scsi3_put_pr_reg(pr_reg);
+ conflict = 1;
+ } else {
+ /*
+ * Following spc2r20 5.5.1 Reservations overview:
+ *
+ * If a logical unit has executed a PERSISTENT RESERVE OUT
+ * command with the REGISTER or the REGISTER AND IGNORE
+ * EXISTING KEY service action and is still registered by any
+ * initiator, all RESERVE commands and all RELEASE commands
+ * regardless of initiator shall conflict and shall terminate
+ * with a RESERVATION CONFLICT status.
+ */
+ spin_lock(&pr_tmpl->registration_lock);
+ conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
+ spin_unlock(&pr_tmpl->registration_lock);
+ }
+
+ if (conflict) {
+ pr_err("Received legacy SPC-2 RESERVE/RELEASE"
+ " while active SPC-3 registrations exist,"
+ " returning RESERVATION_CONFLICT\n");
+ *ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
+ return true;
+ }
+
+ return false;
+}
+
+int target_scsi2_reservation_release(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
+ int ret;
if (!sess || !tpg)
return 0;
+ if (target_check_scsi2_reservation_conflict(cmd, &ret))
+ return ret;
spin_lock(&dev->dev_reservation_lock);
if (!dev->dev_reserved_node_acl || !sess) {
@@ -150,11 +235,12 @@ static int core_scsi2_reservation_release(struct se_cmd *cmd)
return 0;
}
-static int core_scsi2_reservation_reserve(struct se_cmd *cmd)
+int target_scsi2_reservation_reserve(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
+ int ret;
if ((cmd->t_task_cdb[1] & 0x01) &&
(cmd->t_task_cdb[1] & 0x02)) {
@@ -168,6 +254,8 @@ static int core_scsi2_reservation_reserve(struct se_cmd *cmd)
*/
if (!sess || !tpg)
return 0;
+ if (target_check_scsi2_reservation_conflict(cmd, &ret))
+ return ret;
spin_lock(&dev->dev_reservation_lock);
if (dev->dev_reserved_node_acl &&
@@ -200,99 +288,6 @@ static int core_scsi2_reservation_reserve(struct se_cmd *cmd)
return 0;
}
-static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
- struct se_node_acl *, struct se_session *);
-static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
-
-/*
- * Setup in target_core_transport.c:transport_generic_cmd_sequencer()
- * and called via struct se_cmd->transport_emulate_cdb() in TCM processing
- * thread context.
- */
-int core_scsi2_emulate_crh(struct se_cmd *cmd)
-{
- struct se_session *se_sess = cmd->se_sess;
- struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
- struct t10_pr_registration *pr_reg;
- struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
- unsigned char *cdb = &cmd->t_task_cdb[0];
- int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
- int conflict = 0;
-
- if (!se_sess)
- return 0;
-
- if (!crh)
- goto after_crh;
-
- pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
- se_sess);
- if (pr_reg) {
- /*
- * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
- * behavior
- *
- * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
- * status, but no reservation shall be established and the
- * persistent reservation shall not be changed, if the command
- * is received from a) and b) below.
- *
- * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
- * status, but the persistent reservation shall not be released,
- * if the command is received from a) and b)
- *
- * a) An I_T nexus that is a persistent reservation holder; or
- * b) An I_T nexus that is registered if a registrants only or
- * all registrants type persistent reservation is present.
- *
- * In all other cases, a RESERVE(6) command, RESERVE(10) command,
- * RELEASE(6) command, or RELEASE(10) command shall be processed
- * as defined in SPC-2.
- */
- if (pr_reg->pr_res_holder) {
- core_scsi3_put_pr_reg(pr_reg);
- return 0;
- }
- if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
- (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
- (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
- (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
- core_scsi3_put_pr_reg(pr_reg);
- return 0;
- }
- core_scsi3_put_pr_reg(pr_reg);
- conflict = 1;
- } else {
- /*
- * Following spc2r20 5.5.1 Reservations overview:
- *
- * If a logical unit has executed a PERSISTENT RESERVE OUT
- * command with the REGISTER or the REGISTER AND IGNORE
- * EXISTING KEY service action and is still registered by any
- * initiator, all RESERVE commands and all RELEASE commands
- * regardless of initiator shall conflict and shall terminate
- * with a RESERVATION CONFLICT status.
- */
- spin_lock(&pr_tmpl->registration_lock);
- conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
- spin_unlock(&pr_tmpl->registration_lock);
- }
-
- if (conflict) {
- pr_err("Received legacy SPC-2 RESERVE/RELEASE"
- " while active SPC-3 registrations exist,"
- " returning RESERVATION_CONFLICT\n");
- return PYX_TRANSPORT_RESERVATION_CONFLICT;
- }
-
-after_crh:
- if ((cdb[0] == RESERVE) || (cdb[0] == RESERVE_10))
- return core_scsi2_reservation_reserve(cmd);
- else if ((cdb[0] == RELEASE) || (cdb[0] == RELEASE_10))
- return core_scsi2_reservation_release(cmd);
- else
- return PYX_TRANSPORT_INVALID_CDB_FIELD;
-}
/*
* Begin SPC-3/SPC-4 Persistent Reservations emulation support
@@ -418,12 +413,12 @@ static int core_scsi3_pr_seq_non_holder(
break;
case RELEASE:
case RELEASE_10:
- /* Handled by CRH=1 in core_scsi2_emulate_crh() */
+ /* Handled by CRH=1 in target_scsi2_reservation_release() */
ret = 0;
break;
case RESERVE:
case RESERVE_10:
- /* Handled by CRH=1 in core_scsi2_emulate_crh() */
+ /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
ret = 0;
break;
case TEST_UNIT_READY:
diff --git a/drivers/target/target_core_pr.h b/drivers/target/target_core_pr.h
index c8f47d064584..4e94a427e314 100644
--- a/drivers/target/target_core_pr.h
+++ b/drivers/target/target_core_pr.h
@@ -47,7 +47,8 @@ extern struct kmem_cache *t10_pr_reg_cache;
extern int core_pr_dump_initiator_port(struct t10_pr_registration *,
char *, u32);
-extern int core_scsi2_emulate_crh(struct se_cmd *);
+extern int target_scsi2_reservation_release(struct se_cmd *cmd);
+extern int target_scsi2_reservation_reserve(struct se_cmd *cmd);
extern int core_scsi3_alloc_aptpl_registration(
struct t10_reservation *, u64,
unsigned char *, unsigned char *, u32,
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index e84b26ffb17b..f4232934bac5 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2963,10 +2963,10 @@ static int transport_generic_cmd_sequencer(
* is running in SPC_PASSTHROUGH, and wants reservations
* emulation disabled.
*/
- cmd->transport_emulate_cdb =
- (su_dev->t10_pr.res_type !=
- SPC_PASSTHROUGH) ?
- core_scsi2_emulate_crh : NULL;
+ if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) {
+ cmd->transport_emulate_cdb =
+ target_scsi2_reservation_reserve;
+ }
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
break;
case RELEASE:
@@ -2980,10 +2980,10 @@ static int transport_generic_cmd_sequencer(
else
size = cmd->data_length;
- cmd->transport_emulate_cdb =
- (su_dev->t10_pr.res_type !=
- SPC_PASSTHROUGH) ?
- core_scsi2_emulate_crh : NULL;
+ if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) {
+ cmd->transport_emulate_cdb =
+ target_scsi2_reservation_release;
+ }
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
break;
case SYNCHRONIZE_CACHE:
From 617c0e06c1b30b799d8b25f92eefdc1b098cb9f8 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Thu, 3 Nov 2011 17:50:41 -0400
Subject: [PATCH 16/20] target: split core_scsi3_emulate_pr
Split core_scsi2_emulate_crh into one routine each for the
PERSISTENT_RESERVE_IN and PERSISTENT_RESERVE_OUT side.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_pr.c | 68 ++++++++++++++------------
drivers/target/target_core_pr.h | 4 +-
drivers/target/target_core_transport.c | 11 +++--
3 files changed, 48 insertions(+), 35 deletions(-)
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 830953a743d6..34403e80b87c 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -3734,12 +3734,30 @@ static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
/*
* See spc4r17 section 6.14 Table 170
*/
-static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
+int target_scsi3_emulate_pr_out(struct se_cmd *cmd)
{
+ unsigned char *cdb = &cmd->t_task_cdb[0];
unsigned char *buf;
u64 res_key, sa_res_key;
int sa, scope, type, aptpl;
int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
+
+ /*
+ * Following spc2r20 5.5.1 Reservations overview:
+ *
+ * If a logical unit has been reserved by any RESERVE command and is
+ * still reserved by any initiator, all PERSISTENT RESERVE IN and all
+ * PERSISTENT RESERVE OUT commands shall conflict regardless of
+ * initiator or service action and shall terminate with a RESERVATION
+ * CONFLICT status.
+ */
+ if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
+ pr_err("Received PERSISTENT_RESERVE CDB while legacy"
+ " SPC-2 reservation is held, returning"
+ " RESERVATION_CONFLICT\n");
+ return PYX_TRANSPORT_RESERVATION_CONFLICT;
+ }
+
/*
* FIXME: A NULL struct se_session pointer means an this is not coming from
* a $FABRIC_MOD's nexus, but from internal passthrough ops.
@@ -4185,9 +4203,25 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
return 0;
}
-static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
+int target_scsi3_emulate_pr_in(struct se_cmd *cmd)
{
- switch (cdb[1] & 0x1f) {
+ /*
+ * Following spc2r20 5.5.1 Reservations overview:
+ *
+ * If a logical unit has been reserved by any RESERVE command and is
+ * still reserved by any initiator, all PERSISTENT RESERVE IN and all
+ * PERSISTENT RESERVE OUT commands shall conflict regardless of
+ * initiator or service action and shall terminate with a RESERVATION
+ * CONFLICT status.
+ */
+ if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
+ pr_err("Received PERSISTENT_RESERVE CDB while legacy"
+ " SPC-2 reservation is held, returning"
+ " RESERVATION_CONFLICT\n");
+ return PYX_TRANSPORT_RESERVATION_CONFLICT;
+ }
+
+ switch (cmd->t_task_cdb[1] & 0x1f) {
case PRI_READ_KEYS:
return core_scsi3_pri_read_keys(cmd);
case PRI_READ_RESERVATION:
@@ -4198,35 +4232,9 @@ static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
return core_scsi3_pri_read_full_status(cmd);
default:
pr_err("Unknown PERSISTENT_RESERVE_IN service"
- " action: 0x%02x\n", cdb[1] & 0x1f);
+ " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
return PYX_TRANSPORT_INVALID_CDB_FIELD;
}
-
-}
-
-int core_scsi3_emulate_pr(struct se_cmd *cmd)
-{
- unsigned char *cdb = &cmd->t_task_cdb[0];
- struct se_device *dev = cmd->se_dev;
- /*
- * Following spc2r20 5.5.1 Reservations overview:
- *
- * If a logical unit has been reserved by any RESERVE command and is
- * still reserved by any initiator, all PERSISTENT RESERVE IN and all
- * PERSISTENT RESERVE OUT commands shall conflict regardless of
- * initiator or service action and shall terminate with a RESERVATION
- * CONFLICT status.
- */
- if (dev->dev_flags & DF_SPC2_RESERVATIONS) {
- pr_err("Received PERSISTENT_RESERVE CDB while legacy"
- " SPC-2 reservation is held, returning"
- " RESERVATION_CONFLICT\n");
- return PYX_TRANSPORT_RESERVATION_CONFLICT;
- }
-
- return (cdb[0] == PERSISTENT_RESERVE_OUT) ?
- core_scsi3_emulate_pr_out(cmd, cdb) :
- core_scsi3_emulate_pr_in(cmd, cdb);
}
static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
diff --git a/drivers/target/target_core_pr.h b/drivers/target/target_core_pr.h
index 4e94a427e314..c9acb1108124 100644
--- a/drivers/target/target_core_pr.h
+++ b/drivers/target/target_core_pr.h
@@ -62,7 +62,9 @@ extern void core_scsi3_free_all_registrations(struct se_device *);
extern unsigned char *core_scsi3_pr_dump_type(int);
extern int core_scsi3_check_cdb_abort_and_preempt(struct list_head *,
struct se_cmd *);
-extern int core_scsi3_emulate_pr(struct se_cmd *);
+
+extern int target_scsi3_emulate_pr_in(struct se_cmd *cmd);
+extern int target_scsi3_emulate_pr_out(struct se_cmd *cmd);
extern int core_setup_reservations(struct se_device *, int);
#endif /* TARGET_CORE_PR_H */
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index f4232934bac5..717f84a9b42b 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2842,11 +2842,14 @@ static int transport_generic_cmd_sequencer(
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
break;
case PERSISTENT_RESERVE_IN:
+ if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
+ cmd->transport_emulate_cdb = target_scsi3_emulate_pr_in;
+ size = (cdb[7] << 8) + cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ break;
case PERSISTENT_RESERVE_OUT:
- cmd->transport_emulate_cdb =
- (su_dev->t10_pr.res_type ==
- SPC3_PERSISTENT_RESERVATIONS) ?
- core_scsi3_emulate_pr : NULL;
+ if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
+ cmd->transport_emulate_cdb = target_scsi3_emulate_pr_out;
size = (cdb[7] << 8) + cdb[8];
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
break;
From e76a35d6c809bd1638e3b1b535bb780ac731c380 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Thu, 3 Nov 2011 17:50:42 -0400
Subject: [PATCH 17/20] target: pass the se_task to the CDB emulation callback
We want to be able to handle all CDBs through it and remove hacks like
always using the first task in a CDB in target_report_luns.
Also rename the callback to ->execute_task to better describe its use.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_alua.c | 6 ++--
drivers/target/target_core_alua.h | 4 +--
drivers/target/target_core_device.c | 12 ++-----
drivers/target/target_core_pr.c | 13 ++++---
drivers/target/target_core_pr.h | 8 ++---
drivers/target/target_core_transport.c | 50 ++++++++++----------------
include/target/target_core_base.h | 2 +-
include/target/target_core_device.h | 2 +-
8 files changed, 42 insertions(+), 55 deletions(-)
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 8f4447749c71..14668d05ea0d 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -58,8 +58,9 @@ struct t10_alua_lu_gp *default_lu_gp;
*
* See spc4r17 section 6.27
*/
-int core_emulate_report_target_port_groups(struct se_cmd *cmd)
+int target_emulate_report_target_port_groups(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
struct se_port *port;
struct t10_alua_tg_pt_gp *tg_pt_gp;
@@ -172,8 +173,9 @@ int core_emulate_report_target_port_groups(struct se_cmd *cmd)
*
* See spc4r17 section 6.35
*/
-int core_emulate_set_target_port_groups(struct se_cmd *cmd)
+int target_emulate_set_target_port_groups(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct se_port *port, *l_port = cmd->se_lun->lun_sep;
diff --git a/drivers/target/target_core_alua.h b/drivers/target/target_core_alua.h
index c86f97a081ed..c5b4ecd3e745 100644
--- a/drivers/target/target_core_alua.h
+++ b/drivers/target/target_core_alua.h
@@ -66,8 +66,8 @@ extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
extern struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
-extern int core_emulate_report_target_port_groups(struct se_cmd *);
-extern int core_emulate_set_target_port_groups(struct se_cmd *);
+extern int target_emulate_report_target_port_groups(struct se_task *);
+extern int target_emulate_set_target_port_groups(struct se_task *);
extern int core_alua_check_nonop_delay(struct se_cmd *);
extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
struct se_device *, struct se_port *,
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index f870c3bcfd82..ffbb1d6532e9 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -651,23 +651,15 @@ void core_dev_unexport(
lun->lun_se_dev = NULL;
}
-int transport_core_report_lun_response(struct se_cmd *se_cmd)
+int target_report_luns(struct se_task *se_task)
{
+ struct se_cmd *se_cmd = se_task->task_se_cmd;
struct se_dev_entry *deve;
struct se_lun *se_lun;
struct se_session *se_sess = se_cmd->se_sess;
- struct se_task *se_task;
unsigned char *buf;
u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
- list_for_each_entry(se_task, &se_cmd->t_task_list, t_list)
- break;
-
- if (!se_task) {
- pr_err("Unable to locate struct se_task for struct se_cmd\n");
- return PYX_TRANSPORT_LU_COMM_FAILURE;
- }
-
buf = transport_kmap_first_data_page(se_cmd);
/*
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 34403e80b87c..09e1e3e896c6 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -198,8 +198,9 @@ static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd, int *ret)
return false;
}
-int target_scsi2_reservation_release(struct se_cmd *cmd)
+int target_scsi2_reservation_release(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
@@ -235,8 +236,9 @@ int target_scsi2_reservation_release(struct se_cmd *cmd)
return 0;
}
-int target_scsi2_reservation_reserve(struct se_cmd *cmd)
+int target_scsi2_reservation_reserve(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
@@ -3734,8 +3736,9 @@ static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
/*
* See spc4r17 section 6.14 Table 170
*/
-int target_scsi3_emulate_pr_out(struct se_cmd *cmd)
+int target_scsi3_emulate_pr_out(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
unsigned char *cdb = &cmd->t_task_cdb[0];
unsigned char *buf;
u64 res_key, sa_res_key;
@@ -4203,8 +4206,10 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
return 0;
}
-int target_scsi3_emulate_pr_in(struct se_cmd *cmd)
+int target_scsi3_emulate_pr_in(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
+
/*
* Following spc2r20 5.5.1 Reservations overview:
*
diff --git a/drivers/target/target_core_pr.h b/drivers/target/target_core_pr.h
index c9acb1108124..b97f6940dd05 100644
--- a/drivers/target/target_core_pr.h
+++ b/drivers/target/target_core_pr.h
@@ -47,8 +47,8 @@ extern struct kmem_cache *t10_pr_reg_cache;
extern int core_pr_dump_initiator_port(struct t10_pr_registration *,
char *, u32);
-extern int target_scsi2_reservation_release(struct se_cmd *cmd);
-extern int target_scsi2_reservation_reserve(struct se_cmd *cmd);
+extern int target_scsi2_reservation_release(struct se_task *task);
+extern int target_scsi2_reservation_reserve(struct se_task *task);
extern int core_scsi3_alloc_aptpl_registration(
struct t10_reservation *, u64,
unsigned char *, unsigned char *, u32,
@@ -63,8 +63,8 @@ extern unsigned char *core_scsi3_pr_dump_type(int);
extern int core_scsi3_check_cdb_abort_and_preempt(struct list_head *,
struct se_cmd *);
-extern int target_scsi3_emulate_pr_in(struct se_cmd *cmd);
-extern int target_scsi3_emulate_pr_out(struct se_cmd *cmd);
+extern int target_scsi3_emulate_pr_in(struct se_task *task);
+extern int target_scsi3_emulate_pr_out(struct se_task *task);
extern int core_setup_reservations(struct se_device *, int);
#endif /* TARGET_CORE_PR_H */
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 717f84a9b42b..3ad8db2d3ad3 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2156,12 +2156,12 @@ check_depth:
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
/*
- * The struct se_cmd->transport_emulate_cdb() function pointer is used
+ * The struct se_cmd->execute_task() function pointer is used
* to grab REPORT_LUNS and other CDBs we want to handle before they hit the
* struct se_subsystem_api->do_task() caller below.
*/
- if (cmd->transport_emulate_cdb) {
- error = cmd->transport_emulate_cdb(cmd);
+ if (cmd->execute_task) {
+ error = cmd->execute_task(task);
if (error != 0) {
cmd->transport_error_status = error;
spin_lock_irqsave(&cmd->t_state_lock, flags);
@@ -2174,7 +2174,7 @@ check_depth:
goto check_depth;
}
/*
- * Handle the successful completion for transport_emulate_cdb()
+ * Handle the successful completion for execute_task()
* for synchronous operation, following SCF_EMULATE_CDB_ASYNC
* Otherwise the caller is expected to complete the task with
* proper status.
@@ -2795,12 +2795,10 @@ static int transport_generic_cmd_sequencer(
/*
* Check for emulated MI_REPORT_TARGET_PGS.
*/
- if (cdb[1] == MI_REPORT_TARGET_PGS) {
- cmd->transport_emulate_cdb =
- (su_dev->t10_alua.alua_type ==
- SPC3_ALUA_EMULATED) ?
- core_emulate_report_target_port_groups :
- NULL;
+ if (cdb[1] == MI_REPORT_TARGET_PGS &&
+ su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
+ cmd->execute_task =
+ target_emulate_report_target_port_groups;
}
size = (cdb[6] << 24) | (cdb[7] << 16) |
(cdb[8] << 8) | cdb[9];
@@ -2843,13 +2841,13 @@ static int transport_generic_cmd_sequencer(
break;
case PERSISTENT_RESERVE_IN:
if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
- cmd->transport_emulate_cdb = target_scsi3_emulate_pr_in;
+ cmd->execute_task = target_scsi3_emulate_pr_in;
size = (cdb[7] << 8) + cdb[8];
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
break;
case PERSISTENT_RESERVE_OUT:
if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
- cmd->transport_emulate_cdb = target_scsi3_emulate_pr_out;
+ cmd->execute_task = target_scsi3_emulate_pr_out;
size = (cdb[7] << 8) + cdb[8];
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
break;
@@ -2868,12 +2866,10 @@ static int transport_generic_cmd_sequencer(
*
* Check for emulated MO_SET_TARGET_PGS.
*/
- if (cdb[1] == MO_SET_TARGET_PGS) {
- cmd->transport_emulate_cdb =
- (su_dev->t10_alua.alua_type ==
- SPC3_ALUA_EMULATED) ?
- core_emulate_set_target_port_groups :
- NULL;
+ if (cdb[1] == MO_SET_TARGET_PGS &&
+ su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
+ cmd->execute_task =
+ target_emulate_set_target_port_groups;
}
size = (cdb[6] << 24) | (cdb[7] << 16) |
@@ -2966,10 +2962,8 @@ static int transport_generic_cmd_sequencer(
* is running in SPC_PASSTHROUGH, and wants reservations
* emulation disabled.
*/
- if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) {
- cmd->transport_emulate_cdb =
- target_scsi2_reservation_reserve;
- }
+ if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
+ cmd->execute_task = target_scsi2_reservation_reserve;
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
break;
case RELEASE:
@@ -2983,10 +2977,8 @@ static int transport_generic_cmd_sequencer(
else
size = cmd->data_length;
- if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) {
- cmd->transport_emulate_cdb =
- target_scsi2_reservation_release;
- }
+ if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
+ cmd->execute_task = target_scsi2_reservation_release;
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
break;
case SYNCHRONIZE_CACHE:
@@ -3007,9 +2999,6 @@ static int transport_generic_cmd_sequencer(
size = transport_get_size(sectors, cdb, cmd);
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
- /*
- * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
- */
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
break;
/*
@@ -3086,8 +3075,7 @@ static int transport_generic_cmd_sequencer(
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
break;
case REPORT_LUNS:
- cmd->transport_emulate_cdb =
- transport_core_report_lun_response;
+ cmd->execute_task = target_report_luns;
size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
/*
* Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index dd245b68be5a..14c1a71a36eb 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -457,7 +457,7 @@ struct se_cmd {
struct list_head se_cmd_list;
struct completion cmd_wait_comp;
struct target_core_fabric_ops *se_tfo;
- int (*transport_emulate_cdb)(struct se_cmd *);
+ int (*execute_task)(struct se_task *);
void (*transport_complete_callback)(struct se_cmd *);
unsigned char *t_task_cdb;
diff --git a/include/target/target_core_device.h b/include/target/target_core_device.h
index 46571912086c..2be31ff8763b 100644
--- a/include/target/target_core_device.h
+++ b/include/target/target_core_device.h
@@ -17,7 +17,7 @@ extern int core_dev_export(struct se_device *, struct se_portal_group *,
struct se_lun *);
extern void core_dev_unexport(struct se_device *, struct se_portal_group *,
struct se_lun *);
-extern int transport_core_report_lun_response(struct se_cmd *);
+extern int target_report_luns(struct se_task *);
extern void se_release_device_for_hba(struct se_device *);
extern void se_release_vpd_for_dev(struct se_device *);
extern void se_clear_dev_ports(struct se_device *);
From 6ed5a557905f1c4e9ca5f8a6d607303a12d097e1 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Thu, 3 Nov 2011 17:50:43 -0400
Subject: [PATCH 18/20] target: refactor transport_emulate_control_cdb
Encapsulate each CDB emulation into a function of its own, to prepare
setting ->exectute_task to these routines.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_cdb.c | 105 +++++++++++++++++--------------
1 file changed, 59 insertions(+), 46 deletions(-)
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 38535eb13929..ff2dfa383735 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -680,8 +680,9 @@ target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
}
static int
-target_emulate_inquiry(struct se_cmd *cmd)
+target_emulate_inquiry(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
unsigned char *buf;
unsigned char *cdb = cmd->t_task_cdb;
@@ -721,8 +722,9 @@ target_emulate_inquiry(struct se_cmd *cmd)
}
static int
-target_emulate_readcapacity(struct se_cmd *cmd)
+target_emulate_readcapacity(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
unsigned char *buf;
unsigned long long blocks_long = dev->transport->get_blocks(dev);
@@ -755,8 +757,9 @@ target_emulate_readcapacity(struct se_cmd *cmd)
}
static int
-target_emulate_readcapacity_16(struct se_cmd *cmd)
+target_emulate_readcapacity_16(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
unsigned char *buf;
unsigned long long blocks = dev->transport->get_blocks(dev);
@@ -923,13 +926,15 @@ target_modesense_dpofua(unsigned char *buf, int type)
}
static int
-target_emulate_modesense(struct se_cmd *cmd, int ten)
+target_emulate_modesense(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
char *cdb = cmd->t_task_cdb;
unsigned char *rbuf;
int type = dev->transport->get_device_type(dev);
- int offset = (ten) ? 8 : 4;
+ int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
+ int offset = ten ? 8 : 4;
int length = 0;
unsigned char buf[SE_MODE_PAGE_BUF];
@@ -999,8 +1004,9 @@ target_emulate_modesense(struct se_cmd *cmd, int ten)
}
static int
-target_emulate_request_sense(struct se_cmd *cmd)
+target_emulate_request_sense(struct se_task *task)
{
+ struct se_cmd *cmd = task->task_se_cmd;
unsigned char *cdb = cmd->t_task_cdb;
unsigned char *buf;
u8 ua_asc = 0, ua_ascq = 0;
@@ -1079,6 +1085,12 @@ target_emulate_unmap(struct se_task *task)
int ret = 0, offset;
unsigned short dl, bd_dl;
+ if (!dev->transport->do_discard) {
+ pr_err("UNMAP emulation not supported for: %s\n",
+ dev->transport->name);
+ return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ }
+
/* First UNMAP block descriptor starts at 8 byte offset */
offset = 8;
size -= 8;
@@ -1119,13 +1131,28 @@ err:
* Note this is not used for TCM/pSCSI passthrough
*/
static int
-target_emulate_write_same(struct se_task *task, u32 num_blocks)
+target_emulate_write_same(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
sector_t range;
sector_t lba = cmd->t_task_lba;
+ u32 num_blocks;
int ret;
+
+ if (!dev->transport->do_discard) {
+ pr_err("WRITE_SAME emulation not supported"
+ " for: %s\n", dev->transport->name);
+ return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ }
+
+ if (cmd->t_task_cdb[0] == WRITE_SAME)
+ num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
+ else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
+ num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
+ else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
+ num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
+
/*
* Use the explicit range when non zero is supplied, otherwise calculate
* the remaining range based on ->get_blocks() - starting LBA.
@@ -1147,6 +1174,21 @@ target_emulate_write_same(struct se_task *task, u32 num_blocks)
return 0;
}
+static int
+target_emulate_synchronize_cache(struct se_task *task)
+{
+ struct se_device *dev = task->task_se_cmd->se_dev;
+
+ if (!dev->transport->do_sync_cache) {
+ pr_err("SYNCHRONIZE_CACHE emulation not supported"
+ " for: %s\n", dev->transport->name);
+ return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ }
+
+ dev->transport->do_sync_cache(task);
+ return 0;
+}
+
int
transport_emulate_control_cdb(struct se_task *task)
{
@@ -1157,21 +1199,21 @@ transport_emulate_control_cdb(struct se_task *task)
switch (cmd->t_task_cdb[0]) {
case INQUIRY:
- ret = target_emulate_inquiry(cmd);
+ ret = target_emulate_inquiry(task);
break;
case READ_CAPACITY:
- ret = target_emulate_readcapacity(cmd);
+ ret = target_emulate_readcapacity(task);
break;
case MODE_SENSE:
- ret = target_emulate_modesense(cmd, 0);
+ ret = target_emulate_modesense(task);
break;
case MODE_SENSE_10:
- ret = target_emulate_modesense(cmd, 1);
+ ret = target_emulate_modesense(task);
break;
case SERVICE_ACTION_IN:
switch (cmd->t_task_cdb[1] & 0x1f) {
case SAI_READ_CAPACITY_16:
- ret = target_emulate_readcapacity_16(cmd);
+ ret = target_emulate_readcapacity_16(task);
break;
default:
pr_err("Unsupported SA: 0x%02x\n",
@@ -1180,47 +1222,23 @@ transport_emulate_control_cdb(struct se_task *task)
}
break;
case REQUEST_SENSE:
- ret = target_emulate_request_sense(cmd);
+ ret = target_emulate_request_sense(task);
break;
case UNMAP:
- if (!dev->transport->do_discard) {
- pr_err("UNMAP emulation not supported for: %s\n",
- dev->transport->name);
- return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- }
ret = target_emulate_unmap(task);
break;
case WRITE_SAME:
- if (!dev->transport->do_discard) {
- pr_err("WRITE_SAME emulation not supported"
- " for: %s\n", dev->transport->name);
- return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- }
- ret = target_emulate_write_same(task,
- get_unaligned_be16(&cmd->t_task_cdb[7]));
+ ret = target_emulate_write_same(task);
break;
case WRITE_SAME_16:
- if (!dev->transport->do_discard) {
- pr_err("WRITE_SAME_16 emulation not supported"
- " for: %s\n", dev->transport->name);
- return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- }
- ret = target_emulate_write_same(task,
- get_unaligned_be32(&cmd->t_task_cdb[10]));
+ ret = target_emulate_write_same(task);
break;
case VARIABLE_LENGTH_CMD:
service_action =
get_unaligned_be16(&cmd->t_task_cdb[8]);
switch (service_action) {
case WRITE_SAME_32:
- if (!dev->transport->do_discard) {
- pr_err("WRITE_SAME_32 SA emulation not"
- " supported for: %s\n",
- dev->transport->name);
- return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- }
- ret = target_emulate_write_same(task,
- get_unaligned_be32(&cmd->t_task_cdb[28]));
+ ret = target_emulate_write_same(task);
break;
default:
pr_err("Unsupported VARIABLE_LENGTH_CMD SA:"
@@ -1230,12 +1248,7 @@ transport_emulate_control_cdb(struct se_task *task)
break;
case SYNCHRONIZE_CACHE:
case 0x91: /* SYNCHRONIZE_CACHE_16: */
- if (!dev->transport->do_sync_cache) {
- pr_err("SYNCHRONIZE_CACHE emulation not supported"
- " for: %s\n", dev->transport->name);
- return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- }
- dev->transport->do_sync_cache(task);
+ ret = target_emulate_synchronize_cache(task);
break;
case ALLOW_MEDIUM_REMOVAL:
case ERASE:
From d29a5b6acc4b63d4e05ff554509df6fbeaf527cd Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Thu, 3 Nov 2011 17:50:44 -0400
Subject: [PATCH 19/20] target: remove SCF_EMULATE_CDB_ASYNC
All ->execute_task instances now need to complete the I/O explicitly,
which can either happen synchronously or asynchronously.
Note that a lot of the CDB emulations appear to return success even if
some lowlevel operations failed. Given that this is an existing issue
this patch doesn't change that fact.
(nab: Adding missing switch breaks in PR-IN + PR_OUT)
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_alua.c | 5 +-
drivers/target/target_core_cdb.c | 58 +++++++----
drivers/target/target_core_device.c | 2 +
drivers/target/target_core_pr.c | 129 ++++++++++++++++---------
drivers/target/target_core_transport.c | 47 ++-------
include/target/target_core_base.h | 1 -
6 files changed, 142 insertions(+), 100 deletions(-)
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 14668d05ea0d..2739b93983a2 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -165,6 +165,8 @@ int target_emulate_report_target_port_groups(struct se_task *task)
transport_kunmap_first_data_page(cmd);
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
return 0;
}
@@ -343,7 +345,8 @@ int target_emulate_set_target_port_groups(struct se_task *task)
out:
transport_kunmap_first_data_page(cmd);
-
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
return 0;
}
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index ff2dfa383735..5a03085304e5 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -688,8 +688,10 @@ target_emulate_inquiry(struct se_task *task)
unsigned char *cdb = cmd->t_task_cdb;
int p, ret;
- if (!(cdb[1] & 0x1))
- return target_emulate_inquiry_std(cmd);
+ if (!(cdb[1] & 0x1)) {
+ ret = target_emulate_inquiry_std(cmd);
+ goto out;
+ }
/*
* Make sure we at least have 4 bytes of INQUIRY response
@@ -708,17 +710,25 @@ target_emulate_inquiry(struct se_task *task)
buf[0] = dev->transport->get_device_type(dev);
- for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
+ for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
if (cdb[2] == evpd_handlers[p].page) {
buf[1] = cdb[2];
ret = evpd_handlers[p].emulate(cmd, buf);
- transport_kunmap_first_data_page(cmd);
- return ret;
+ goto out_unmap;
}
+ }
- transport_kunmap_first_data_page(cmd);
pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
- return -EINVAL;
+ ret = -EINVAL;
+
+out_unmap:
+ transport_kunmap_first_data_page(cmd);
+out:
+ if (!ret) {
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ }
+ return ret;
}
static int
@@ -753,6 +763,8 @@ target_emulate_readcapacity(struct se_task *task)
transport_kunmap_first_data_page(cmd);
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
return 0;
}
@@ -787,6 +799,8 @@ target_emulate_readcapacity_16(struct se_task *task)
transport_kunmap_first_data_page(cmd);
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
return 0;
}
@@ -1000,6 +1014,8 @@ target_emulate_modesense(struct se_task *task)
memcpy(rbuf, buf, offset);
transport_kunmap_first_data_page(cmd);
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
return 0;
}
@@ -1065,7 +1081,8 @@ target_emulate_request_sense(struct se_task *task)
end:
transport_kunmap_first_data_page(cmd);
-
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
return 0;
}
@@ -1122,7 +1139,10 @@ target_emulate_unmap(struct se_task *task)
err:
transport_kunmap_first_data_page(cmd);
-
+ if (!ret) {
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ }
return ret;
}
@@ -1171,6 +1191,8 @@ target_emulate_write_same(struct se_task *task)
return ret;
}
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
return 0;
}
@@ -1189,6 +1211,14 @@ target_emulate_synchronize_cache(struct se_task *task)
return 0;
}
+static int
+target_emulate_noop(struct se_task *task)
+{
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ return 0;
+}
+
int
transport_emulate_control_cdb(struct se_task *task)
{
@@ -1259,6 +1289,7 @@ transport_emulate_control_cdb(struct se_task *task)
case TEST_UNIT_READY:
case VERIFY:
case WRITE_FILEMARKS:
+ ret = target_emulate_noop(task);
break;
default:
pr_err("Unsupported SCSI Opcode: 0x%02x for %s\n",
@@ -1268,15 +1299,6 @@ transport_emulate_control_cdb(struct se_task *task)
if (ret < 0)
return ret;
- /*
- * Handle the successful completion here unless a caller
- * has explictly requested an asychronous completion.
- */
- if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
- task->task_scsi_status = GOOD;
- transport_complete_task(task, 1);
- }
-
return PYX_TRANSPORT_SENT_TO_TRANSPORT;
}
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index ffbb1d6532e9..28d2c808c56b 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -705,6 +705,8 @@ done:
buf[2] = ((lun_count >> 8) & 0xff);
buf[3] = (lun_count & 0xff);
+ se_task->task_scsi_status = GOOD;
+ transport_complete_task(se_task, 1);
return PYX_TRANSPORT_SENT_TO_TRANSPORT;
}
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 09e1e3e896c6..5a4ebfc3a54f 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -204,23 +204,21 @@ int target_scsi2_reservation_release(struct se_task *task)
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
- int ret;
+ int ret = 0;
if (!sess || !tpg)
- return 0;
+ goto out;
if (target_check_scsi2_reservation_conflict(cmd, &ret))
- return ret;
+ goto out;
+ ret = 0;
spin_lock(&dev->dev_reservation_lock);
- if (!dev->dev_reserved_node_acl || !sess) {
- spin_unlock(&dev->dev_reservation_lock);
- return 0;
- }
+ if (!dev->dev_reserved_node_acl || !sess)
+ goto out_unlock;
+
+ if (dev->dev_reserved_node_acl != sess->se_node_acl)
+ goto out_unlock;
- if (dev->dev_reserved_node_acl != sess->se_node_acl) {
- spin_unlock(&dev->dev_reservation_lock);
- return 0;
- }
dev->dev_reserved_node_acl = NULL;
dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
@@ -231,9 +229,15 @@ int target_scsi2_reservation_release(struct se_task *task)
" MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
- spin_unlock(&dev->dev_reservation_lock);
- return 0;
+out_unlock:
+ spin_unlock(&dev->dev_reservation_lock);
+out:
+ if (!ret) {
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ }
+ return ret;
}
int target_scsi2_reservation_reserve(struct se_task *task)
@@ -242,23 +246,25 @@ int target_scsi2_reservation_reserve(struct se_task *task)
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
- int ret;
+ int ret = 0;
if ((cmd->t_task_cdb[1] & 0x01) &&
(cmd->t_task_cdb[1] & 0x02)) {
pr_err("LongIO and Obselete Bits set, returning"
" ILLEGAL_REQUEST\n");
- return PYX_TRANSPORT_ILLEGAL_REQUEST;
+ ret = PYX_TRANSPORT_ILLEGAL_REQUEST;
+ goto out;
}
/*
* This is currently the case for target_core_mod passthrough struct se_cmd
* ops
*/
if (!sess || !tpg)
- return 0;
+ goto out;
if (target_check_scsi2_reservation_conflict(cmd, &ret))
- return ret;
+ goto out;
+ ret = 0;
spin_lock(&dev->dev_reservation_lock);
if (dev->dev_reserved_node_acl &&
(dev->dev_reserved_node_acl != sess->se_node_acl)) {
@@ -271,8 +277,8 @@ int target_scsi2_reservation_reserve(struct se_task *task)
" from %s \n", cmd->se_lun->unpacked_lun,
cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
- spin_unlock(&dev->dev_reservation_lock);
- return PYX_TRANSPORT_RESERVATION_CONFLICT;
+ ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
+ goto out_unlock;
}
dev->dev_reserved_node_acl = sess->se_node_acl;
@@ -285,9 +291,15 @@ int target_scsi2_reservation_reserve(struct se_task *task)
" for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
- spin_unlock(&dev->dev_reservation_lock);
- return 0;
+out_unlock:
+ spin_unlock(&dev->dev_reservation_lock);
+out:
+ if (!ret) {
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ }
+ return ret;
}
@@ -3744,6 +3756,7 @@ int target_scsi3_emulate_pr_out(struct se_task *task)
u64 res_key, sa_res_key;
int sa, scope, type, aptpl;
int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
+ int ret;
/*
* Following spc2r20 5.5.1 Reservations overview:
@@ -3758,7 +3771,8 @@ int target_scsi3_emulate_pr_out(struct se_task *task)
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
" SPC-2 reservation is held, returning"
" RESERVATION_CONFLICT\n");
- return PYX_TRANSPORT_RESERVATION_CONFLICT;
+ ret = PYX_TRANSPORT_RESERVATION_CONFLICT;
+ goto out;
}
/*
@@ -3771,7 +3785,8 @@ int target_scsi3_emulate_pr_out(struct se_task *task)
if (cmd->data_length < 24) {
pr_warn("SPC-PR: Received PR OUT parameter list"
" length too small: %u\n", cmd->data_length);
- return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+ ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+ goto out;
}
/*
* From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
@@ -3804,8 +3819,11 @@ int target_scsi3_emulate_pr_out(struct se_task *task)
/*
* SPEC_I_PT=1 is only valid for Service action: REGISTER
*/
- if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
- return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+ if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) {
+ ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+ goto out;
+ }
+
/*
* From spc4r17 section 6.14:
*
@@ -3819,7 +3837,8 @@ int target_scsi3_emulate_pr_out(struct se_task *task)
(cmd->data_length != 24)) {
pr_warn("SPC-PR: Received PR OUT illegal parameter"
" list length: %u\n", cmd->data_length);
- return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+ ret = PYX_TRANSPORT_INVALID_PARAMETER_LIST;
+ goto out;
}
/*
* (core_scsi3_emulate_pro_* function parameters
@@ -3828,35 +3847,47 @@ int target_scsi3_emulate_pr_out(struct se_task *task)
*/
switch (sa) {
case PRO_REGISTER:
- return core_scsi3_emulate_pro_register(cmd,
+ ret = core_scsi3_emulate_pro_register(cmd,
res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
+ break;
case PRO_RESERVE:
- return core_scsi3_emulate_pro_reserve(cmd,
- type, scope, res_key);
+ ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
+ break;
case PRO_RELEASE:
- return core_scsi3_emulate_pro_release(cmd,
- type, scope, res_key);
+ ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
+ break;
case PRO_CLEAR:
- return core_scsi3_emulate_pro_clear(cmd, res_key);
+ ret = core_scsi3_emulate_pro_clear(cmd, res_key);
+ break;
case PRO_PREEMPT:
- return core_scsi3_emulate_pro_preempt(cmd, type, scope,
+ ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
res_key, sa_res_key, 0);
+ break;
case PRO_PREEMPT_AND_ABORT:
- return core_scsi3_emulate_pro_preempt(cmd, type, scope,
+ ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
res_key, sa_res_key, 1);
+ break;
case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
- return core_scsi3_emulate_pro_register(cmd,
+ ret = core_scsi3_emulate_pro_register(cmd,
0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
+ break;
case PRO_REGISTER_AND_MOVE:
- return core_scsi3_emulate_pro_register_and_move(cmd, res_key,
+ ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
sa_res_key, aptpl, unreg);
+ break;
default:
pr_err("Unknown PERSISTENT_RESERVE_OUT service"
" action: 0x%02x\n", cdb[1] & 0x1f);
- return PYX_TRANSPORT_INVALID_CDB_FIELD;
+ ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
+ break;
}
- return PYX_TRANSPORT_INVALID_CDB_FIELD;
+out:
+ if (!ret) {
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ }
+ return ret;
}
/*
@@ -4209,6 +4240,7 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
int target_scsi3_emulate_pr_in(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
+ int ret;
/*
* Following spc2r20 5.5.1 Reservations overview:
@@ -4228,18 +4260,29 @@ int target_scsi3_emulate_pr_in(struct se_task *task)
switch (cmd->t_task_cdb[1] & 0x1f) {
case PRI_READ_KEYS:
- return core_scsi3_pri_read_keys(cmd);
+ ret = core_scsi3_pri_read_keys(cmd);
+ break;
case PRI_READ_RESERVATION:
- return core_scsi3_pri_read_reservation(cmd);
+ ret = core_scsi3_pri_read_reservation(cmd);
+ break;
case PRI_REPORT_CAPABILITIES:
- return core_scsi3_pri_report_capabilities(cmd);
+ ret = core_scsi3_pri_report_capabilities(cmd);
+ break;
case PRI_READ_FULL_STATUS:
- return core_scsi3_pri_read_full_status(cmd);
+ ret = core_scsi3_pri_read_full_status(cmd);
+ break;
default:
pr_err("Unknown PERSISTENT_RESERVE_IN service"
" action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
- return PYX_TRANSPORT_INVALID_CDB_FIELD;
+ ret = PYX_TRANSPORT_INVALID_CDB_FIELD;
+ break;
}
+
+ if (!ret) {
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ }
+ return ret;
}
static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 3ad8db2d3ad3..74015793c03a 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2162,28 +2162,6 @@ check_depth:
*/
if (cmd->execute_task) {
error = cmd->execute_task(task);
- if (error != 0) {
- cmd->transport_error_status = error;
- spin_lock_irqsave(&cmd->t_state_lock, flags);
- task->task_flags &= ~TF_ACTIVE;
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- atomic_set(&cmd->t_transport_sent, 0);
- transport_stop_tasks_for_cmd(cmd);
- atomic_inc(&dev->depth_left);
- transport_generic_request_failure(cmd, 0, 1);
- goto check_depth;
- }
- /*
- * Handle the successful completion for execute_task()
- * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
- * Otherwise the caller is expected to complete the task with
- * proper status.
- */
- if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
- cmd->scsi_status = SAM_STAT_GOOD;
- task->task_scsi_status = GOOD;
- transport_complete_task(task, 1);
- }
} else {
/*
* Currently for all virtual TCM plugins including IBLOCK, FILEIO and
@@ -2200,17 +2178,17 @@ check_depth:
error = transport_emulate_control_cdb(task);
else
error = dev->transport->do_task(task);
+ }
- if (error != 0) {
- cmd->transport_error_status = error;
- spin_lock_irqsave(&cmd->t_state_lock, flags);
- task->task_flags &= ~TF_ACTIVE;
- spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- atomic_set(&cmd->t_transport_sent, 0);
- transport_stop_tasks_for_cmd(cmd);
- atomic_inc(&dev->depth_left);
- transport_generic_request_failure(cmd, 0, 1);
- }
+ if (error != 0) {
+ cmd->transport_error_status = error;
+ spin_lock_irqsave(&cmd->t_state_lock, flags);
+ task->task_flags &= ~TF_ACTIVE;
+ spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ atomic_set(&cmd->t_transport_sent, 0);
+ transport_stop_tasks_for_cmd(cmd);
+ atomic_inc(&dev->depth_left);
+ transport_generic_request_failure(cmd, 0, 1);
}
goto check_depth;
@@ -3001,11 +2979,6 @@ static int transport_generic_cmd_sequencer(
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
break;
- /*
- * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
- * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
- */
- cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
/*
* Check to ensure that LBA + Range does not exceed past end of
* device for IBLOCK and FILEIO ->do_sync_cache() backend calls
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 14c1a71a36eb..7f5fed3c89e1 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -114,7 +114,6 @@ enum se_cmd_flags_table {
SCF_DELAYED_CMD_FROM_SAM_ATTR = 0x00080000,
SCF_UNUSED = 0x00100000,
SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC = 0x00400000,
- SCF_EMULATE_CDB_ASYNC = 0x01000000,
};
/* struct se_dev_entry->lun_flags and struct se_lun->lun_access */
From 5bda90c8f20f0af93375721533f4081a40fa6f41 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Thu, 3 Nov 2011 17:50:45 -0400
Subject: [PATCH 20/20] target: use ->exectute_task for all CDB emulation
Instead of calling into transport_emulate_control_cdb from
__transport_execute_tasks for some CDBs always set up ->exectute_tasks
in the command sequence and use it uniformly.
(nab: Add default passthrough break for SERVICE_ACTION_IN)
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_cdb.c | 111 +++---------------------
drivers/target/target_core_cdb.h | 14 ++++
drivers/target/target_core_transport.c | 112 ++++++++++++++++---------
3 files changed, 97 insertions(+), 140 deletions(-)
create mode 100644 drivers/target/target_core_cdb.h
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 5a03085304e5..683ba02b8247 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -32,6 +32,7 @@
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>
#include "target_core_ua.h"
+#include "target_core_cdb.h"
static void
target_fill_alua_data(struct se_port *port, unsigned char *buf)
@@ -679,8 +680,7 @@ target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
return 0;
}
-static int
-target_emulate_inquiry(struct se_task *task)
+int target_emulate_inquiry(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
@@ -731,8 +731,7 @@ out:
return ret;
}
-static int
-target_emulate_readcapacity(struct se_task *task)
+int target_emulate_readcapacity(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
@@ -768,8 +767,7 @@ target_emulate_readcapacity(struct se_task *task)
return 0;
}
-static int
-target_emulate_readcapacity_16(struct se_task *task)
+int target_emulate_readcapacity_16(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
@@ -939,8 +937,7 @@ target_modesense_dpofua(unsigned char *buf, int type)
}
}
-static int
-target_emulate_modesense(struct se_task *task)
+int target_emulate_modesense(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
@@ -1019,8 +1016,7 @@ target_emulate_modesense(struct se_task *task)
return 0;
}
-static int
-target_emulate_request_sense(struct se_task *task)
+int target_emulate_request_sense(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
unsigned char *cdb = cmd->t_task_cdb;
@@ -1090,8 +1086,7 @@ end:
* Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
* Note this is not used for TCM/pSCSI passthrough
*/
-static int
-target_emulate_unmap(struct se_task *task)
+int target_emulate_unmap(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
@@ -1150,8 +1145,7 @@ err:
* Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
* Note this is not used for TCM/pSCSI passthrough
*/
-static int
-target_emulate_write_same(struct se_task *task)
+int target_emulate_write_same(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
@@ -1196,8 +1190,7 @@ target_emulate_write_same(struct se_task *task)
return 0;
}
-static int
-target_emulate_synchronize_cache(struct se_task *task)
+int target_emulate_synchronize_cache(struct se_task *task)
{
struct se_device *dev = task->task_se_cmd->se_dev;
@@ -1211,97 +1204,13 @@ target_emulate_synchronize_cache(struct se_task *task)
return 0;
}
-static int
-target_emulate_noop(struct se_task *task)
+int target_emulate_noop(struct se_task *task)
{
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;
}
-int
-transport_emulate_control_cdb(struct se_task *task)
-{
- struct se_cmd *cmd = task->task_se_cmd;
- struct se_device *dev = cmd->se_dev;
- unsigned short service_action;
- int ret = 0;
-
- switch (cmd->t_task_cdb[0]) {
- case INQUIRY:
- ret = target_emulate_inquiry(task);
- break;
- case READ_CAPACITY:
- ret = target_emulate_readcapacity(task);
- break;
- case MODE_SENSE:
- ret = target_emulate_modesense(task);
- break;
- case MODE_SENSE_10:
- ret = target_emulate_modesense(task);
- break;
- case SERVICE_ACTION_IN:
- switch (cmd->t_task_cdb[1] & 0x1f) {
- case SAI_READ_CAPACITY_16:
- ret = target_emulate_readcapacity_16(task);
- break;
- default:
- pr_err("Unsupported SA: 0x%02x\n",
- cmd->t_task_cdb[1] & 0x1f);
- return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- }
- break;
- case REQUEST_SENSE:
- ret = target_emulate_request_sense(task);
- break;
- case UNMAP:
- ret = target_emulate_unmap(task);
- break;
- case WRITE_SAME:
- ret = target_emulate_write_same(task);
- break;
- case WRITE_SAME_16:
- ret = target_emulate_write_same(task);
- break;
- case VARIABLE_LENGTH_CMD:
- service_action =
- get_unaligned_be16(&cmd->t_task_cdb[8]);
- switch (service_action) {
- case WRITE_SAME_32:
- ret = target_emulate_write_same(task);
- break;
- default:
- pr_err("Unsupported VARIABLE_LENGTH_CMD SA:"
- " 0x%02x\n", service_action);
- break;
- }
- break;
- case SYNCHRONIZE_CACHE:
- case 0x91: /* SYNCHRONIZE_CACHE_16: */
- ret = target_emulate_synchronize_cache(task);
- break;
- case ALLOW_MEDIUM_REMOVAL:
- case ERASE:
- case REZERO_UNIT:
- case SEEK_10:
- case SPACE:
- case START_STOP:
- case TEST_UNIT_READY:
- case VERIFY:
- case WRITE_FILEMARKS:
- ret = target_emulate_noop(task);
- break;
- default:
- pr_err("Unsupported SCSI Opcode: 0x%02x for %s\n",
- cmd->t_task_cdb[0], dev->transport->name);
- return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- }
-
- if (ret < 0)
- return ret;
- return PYX_TRANSPORT_SENT_TO_TRANSPORT;
-}
-
/*
* Write a CDB into @cdb that is based on the one the intiator sent us,
* but updated to only cover the sectors that the current task handles.
diff --git a/drivers/target/target_core_cdb.h b/drivers/target/target_core_cdb.h
new file mode 100644
index 000000000000..ad6b1e393001
--- /dev/null
+++ b/drivers/target/target_core_cdb.h
@@ -0,0 +1,14 @@
+#ifndef TARGET_CORE_CDB_H
+#define TARGET_CORE_CDB_H
+
+int target_emulate_inquiry(struct se_task *task);
+int target_emulate_readcapacity(struct se_task *task);
+int target_emulate_readcapacity_16(struct se_task *task);
+int target_emulate_modesense(struct se_task *task);
+int target_emulate_request_sense(struct se_task *task);
+int target_emulate_unmap(struct se_task *task);
+int target_emulate_write_same(struct se_task *task);
+int target_emulate_synchronize_cache(struct se_task *task);
+int target_emulate_noop(struct se_task *task);
+
+#endif /* TARGET_CORE_CDB_H */
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 74015793c03a..f603b12485bd 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -52,6 +52,7 @@
#include <target/target_core_configfs.h>
#include "target_core_alua.h"
+#include "target_core_cdb.h"
#include "target_core_hba.h"
#include "target_core_pr.h"
#include "target_core_ua.h"
@@ -2155,31 +2156,11 @@ check_depth:
atomic_set(&cmd->t_transport_sent, 1);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
- /*
- * The struct se_cmd->execute_task() function pointer is used
- * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
- * struct se_subsystem_api->do_task() caller below.
- */
- if (cmd->execute_task) {
- error = cmd->execute_task(task);
- } else {
- /*
- * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
- * RAMDISK we use the internal transport_emulate_control_cdb() logic
- * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
- * LUN emulation code.
- *
- * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
- * call ->do_task() directly and let the underlying TCM subsystem plugin
- * code handle the CDB emulation.
- */
- if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
- (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
- error = transport_emulate_control_cdb(task);
- else
- error = dev->transport->do_task(task);
- }
+ if (cmd->execute_task)
+ error = cmd->execute_task(task);
+ else
+ error = dev->transport->do_task(task);
if (error != 0) {
cmd->transport_error_status = error;
spin_lock_irqsave(&cmd->t_state_lock, flags);
@@ -2622,6 +2603,13 @@ static int transport_generic_cmd_sequencer(
*/
}
+ /*
+ * If we operate in passthrough mode we skip most CDB emulation and
+ * instead hand the commands down to the physical SCSI device.
+ */
+ passthrough =
+ (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
+
switch (cdb[0]) {
case READ_6:
sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
@@ -2701,9 +2689,12 @@ static int transport_generic_cmd_sequencer(
cmd->t_task_lba = transport_lba_32(cdb);
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
- if (dev->transport->transport_type ==
- TRANSPORT_PLUGIN_PHBA_PDEV)
+ /*
+ * Do now allow BIDI commands for passthrough mode.
+ */
+ if (passthrough)
goto out_unsupported_cdb;
+
/*
* Setup BIDI XOR callback to be run after I/O completion.
*/
@@ -2712,13 +2703,6 @@ static int transport_generic_cmd_sequencer(
break;
case VARIABLE_LENGTH_CMD:
service_action = get_unaligned_be16(&cdb[8]);
- /*
- * Determine if this is TCM/PSCSI device and we should disable
- * internal emulation for this CDB.
- */
- passthrough = (dev->transport->transport_type ==
- TRANSPORT_PLUGIN_PHBA_PDEV);
-
switch (service_action) {
case XDWRITEREAD_32:
sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
@@ -2732,8 +2716,12 @@ static int transport_generic_cmd_sequencer(
cmd->t_task_lba = transport_lba_64_ext(cdb);
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
+ /*
+ * Do now allow BIDI commands for passthrough mode.
+ */
if (passthrough)
goto out_unsupported_cdb;
+
/*
* Setup BIDI XOR callback to be run during after I/O
* completion.
@@ -2759,7 +2747,8 @@ static int transport_generic_cmd_sequencer(
if (target_check_write_same_discard(&cdb[10], dev) < 0)
goto out_invalid_cdb_field;
-
+ if (!passthrough)
+ cmd->execute_task = target_emulate_write_same;
break;
default:
pr_err("VARIABLE_LENGTH_CMD service action"
@@ -2797,8 +2786,15 @@ static int transport_generic_cmd_sequencer(
case MODE_SENSE:
size = cdb[4];
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_modesense;
break;
case MODE_SENSE_10:
+ size = (cdb[7] << 8) + cdb[8];
+ cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_modesense;
+ break;
case GPCMD_READ_BUFFER_CAPACITY:
case GPCMD_SEND_OPC:
case LOG_SELECT:
@@ -2867,6 +2863,8 @@ static int transport_generic_cmd_sequencer(
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
cmd->sam_task_attr = MSG_HEAD_TAG;
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_inquiry;
break;
case READ_BUFFER:
size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
@@ -2875,6 +2873,8 @@ static int transport_generic_cmd_sequencer(
case READ_CAPACITY:
size = READ_CAP_LEN;
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_readcapacity;
break;
case READ_MEDIA_SERIAL_NUMBER:
case SECURITY_PROTOCOL_IN:
@@ -2883,6 +2883,21 @@ static int transport_generic_cmd_sequencer(
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
break;
case SERVICE_ACTION_IN:
+ switch (cmd->t_task_cdb[1] & 0x1f) {
+ case SAI_READ_CAPACITY_16:
+ if (!passthrough)
+ cmd->execute_task =
+ target_emulate_readcapacity_16;
+ break;
+ default:
+ if (passthrough)
+ break;
+
+ pr_err("Unsupported SA: 0x%02x\n",
+ cmd->t_task_cdb[1] & 0x1f);
+ goto out_unsupported_cdb;
+ }
+ /*FALLTHROUGH*/
case ACCESS_CONTROL_IN:
case ACCESS_CONTROL_OUT:
case EXTENDED_COPY:
@@ -2913,6 +2928,8 @@ static int transport_generic_cmd_sequencer(
case REQUEST_SENSE:
size = cdb[4];
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_request_sense;
break;
case READ_ELEMENT_STATUS:
size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
@@ -2977,8 +2994,9 @@ static int transport_generic_cmd_sequencer(
size = transport_get_size(sectors, cdb, cmd);
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
- if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
+ if (passthrough)
break;
+
/*
* Check to ensure that LBA + Range does not exceed past end of
* device for IBLOCK and FILEIO ->do_sync_cache() backend calls
@@ -2987,10 +3005,13 @@ static int transport_generic_cmd_sequencer(
if (transport_cmd_get_valid_sectors(cmd) < 0)
goto out_invalid_cdb_field;
}
+ cmd->execute_task = target_emulate_synchronize_cache;
break;
case UNMAP:
size = get_unaligned_be16(&cdb[7]);
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_unmap;
break;
case WRITE_SAME_16:
sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
@@ -3009,6 +3030,8 @@ static int transport_generic_cmd_sequencer(
if (target_check_write_same_discard(&cdb[1], dev) < 0)
goto out_invalid_cdb_field;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_write_same;
break;
case WRITE_SAME:
sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
@@ -3030,20 +3053,26 @@ static int transport_generic_cmd_sequencer(
*/
if (target_check_write_same_discard(&cdb[1], dev) < 0)
goto out_invalid_cdb_field;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_write_same;
break;
case ALLOW_MEDIUM_REMOVAL:
- case GPCMD_CLOSE_TRACK:
case ERASE:
- case INITIALIZE_ELEMENT_STATUS:
- case GPCMD_LOAD_UNLOAD:
case REZERO_UNIT:
case SEEK_10:
- case GPCMD_SET_SPEED:
case SPACE:
case START_STOP:
case TEST_UNIT_READY:
case VERIFY:
case WRITE_FILEMARKS:
+ cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
+ if (!passthrough)
+ cmd->execute_task = target_emulate_noop;
+ break;
+ case GPCMD_CLOSE_TRACK:
+ case INITIALIZE_ELEMENT_STATUS:
+ case GPCMD_LOAD_UNLOAD:
+ case GPCMD_SET_SPEED:
case MOVE_MEDIUM:
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
break;
@@ -3100,6 +3129,11 @@ static int transport_generic_cmd_sequencer(
cmd->data_length = size;
}
+ /* reject any command that we don't have a handler for */
+ if (!(passthrough || cmd->execute_task ||
+ (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
+ goto out_unsupported_cdb;
+
/* Let's limit control cdbs to a page, for simplicity's sake. */
if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
size > PAGE_SIZE)