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target: move the state and execute lists to the command

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Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2012-04-24 00:25:05 -04:00 committed by Nicholas Bellinger
parent 785fdf70b2
commit cf572a9627
4 changed files with 180 additions and 314 deletions
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5
drivers/target/target_core_internal.h
View File

@ -104,8 +104,7 @@ void release_se_kmem_caches(void);
u32 scsi_get_new_index(scsi_index_t);
void transport_subsystem_check_init(void);
void transport_cmd_finish_abort(struct se_cmd *, int);
void __transport_remove_task_from_execute_queue(struct se_task *,
struct se_device *);
void __target_remove_from_execute_list(struct se_cmd *);
unsigned char *transport_dump_cmd_direction(struct se_cmd *);
void transport_dump_dev_state(struct se_device *, char *, int *);
void transport_dump_dev_info(struct se_device *, struct se_lun *,
@ -114,7 +113,7 @@ void transport_dump_vpd_proto_id(struct t10_vpd *, unsigned char *, int);
int transport_dump_vpd_assoc(struct t10_vpd *, unsigned char *, int);
int transport_dump_vpd_ident_type(struct t10_vpd *, unsigned char *, int);
int transport_dump_vpd_ident(struct t10_vpd *, unsigned char *, int);
bool target_stop_task(struct se_task *task, unsigned long *flags);
bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags);
int transport_clear_lun_from_sessions(struct se_lun *);
void transport_send_task_abort(struct se_cmd *);

54
drivers/target/target_core_tmr.c
View File

@ -244,7 +244,7 @@ static void core_tmr_drain_tmr_list(
}
}
static void core_tmr_drain_task_list(
static void core_tmr_drain_state_list(
struct se_device *dev,
struct se_cmd *prout_cmd,
struct se_node_acl *tmr_nacl,
@ -252,12 +252,13 @@ static void core_tmr_drain_task_list(
struct list_head *preempt_and_abort_list)
{
LIST_HEAD(drain_task_list);
struct se_cmd *cmd;
struct se_task *task, *task_tmp;
struct se_cmd *cmd, *next;
unsigned long flags;
int fe_count;
/*
* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
* Complete outstanding commands with TASK_ABORTED SAM status.
*
* This is following sam4r17, section 5.6 Aborting commands, Table 38
* for TMR LUN_RESET:
*
@ -278,45 +279,36 @@ static void core_tmr_drain_task_list(
* in the Control Mode Page.
*/
spin_lock_irqsave(&dev->execute_task_lock, flags);
list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
t_state_list) {
if (!task->task_se_cmd) {
pr_err("task->task_se_cmd is NULL!\n");
continue;
}
cmd = task->task_se_cmd;
list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) {
/*
* For PREEMPT_AND_ABORT usage, only process commands
* with a matching reservation key.
*/
if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
continue;
/*
* Not aborting PROUT PREEMPT_AND_ABORT CDB..
*/
if (prout_cmd == cmd)
continue;
list_move_tail(&task->t_state_list, &drain_task_list);
task->t_state_active = false;
/*
* Remove from task execute list before processing drain_task_list
*/
if (!list_empty(&task->t_execute_list))
__transport_remove_task_from_execute_queue(task, dev);
list_move_tail(&cmd->state_list, &drain_task_list);
cmd->state_active = false;
if (!list_empty(&cmd->execute_list))
__target_remove_from_execute_list(cmd);
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
while (!list_empty(&drain_task_list)) {
task = list_entry(drain_task_list.next, struct se_task, t_state_list);
list_del(&task->t_state_list);
cmd = task->task_se_cmd;
cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
list_del(&cmd->state_list);
pr_debug("LUN_RESET: %s cmd: %p task: %p"
pr_debug("LUN_RESET: %s cmd: %p"
" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d"
"cdb: 0x%02x\n",
(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
(preempt_and_abort_list) ? "Preempt" : "", cmd,
cmd->se_tfo->get_task_tag(cmd), 0,
cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
cmd->t_task_cdb[0]);
@ -341,12 +333,12 @@ static void core_tmr_drain_task_list(
cancel_work_sync(&cmd->work);
spin_lock_irqsave(&cmd->t_state_lock, flags);
target_stop_task(task, &flags);
target_stop_cmd(cmd, &flags);
if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
pr_debug("LUN_RESET: Skipping task: %p, dev: %p for"
" t_task_cdbs_ex_left: %d\n", task, dev,
pr_debug("LUN_RESET: Skipping cmd: %p, dev: %p for"
" t_task_cdbs_ex_left: %d\n", cmd, dev,
atomic_read(&cmd->t_task_cdbs_ex_left));
continue;
}
@ -354,7 +346,7 @@ static void core_tmr_drain_task_list(
if (!(cmd->transport_state & CMD_T_ACTIVE)) {
pr_debug("LUN_RESET: got CMD_T_ACTIVE for"
" task: %p, t_fe_count: %d dev: %p\n", task,
" cdb: %p, t_fe_count: %d dev: %p\n", cmd,
fe_count, dev);
cmd->transport_state |= CMD_T_ABORTED;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
@ -362,8 +354,8 @@ static void core_tmr_drain_task_list(
core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
continue;
}
pr_debug("LUN_RESET: Got !CMD_T_ACTIVE for task: %p,"
" t_fe_count: %d dev: %p\n", task, fe_count, dev);
pr_debug("LUN_RESET: Got !CMD_T_ACTIVE for cdb: %p,"
" t_fe_count: %d dev: %p\n", cmd, fe_count, dev);
cmd->transport_state |= CMD_T_ABORTED;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
@ -464,7 +456,7 @@ int core_tmr_lun_reset(
dev->transport->name, tas);
core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
core_tmr_drain_task_list(dev, prout_cmd, tmr_nacl, tas,
core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas,
preempt_and_abort_list);
core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas,
preempt_and_abort_list);

409
drivers/target/target_core_transport.c
View File

@ -444,32 +444,24 @@ EXPORT_SYMBOL(transport_deregister_session);
/*
* Called with cmd->t_state_lock held.
*/
static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
static void target_remove_from_state_list(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_task *task;
unsigned long flags;
if (!dev)
return;
task = cmd->t_task;
if (task) {
if (task->task_flags & TF_ACTIVE)
return;
if (cmd->transport_state & CMD_T_BUSY)
return;
spin_lock_irqsave(&dev->execute_task_lock, flags);
if (task->t_state_active) {
pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
cmd->se_tfo->get_task_tag(cmd), dev, task);
list_del(&task->t_state_list);
atomic_dec(&cmd->t_task_cdbs_ex_left);
task->t_state_active = false;
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
spin_lock_irqsave(&dev->execute_task_lock, flags);
if (cmd->state_active) {
list_del(&cmd->state_list);
atomic_dec(&cmd->t_task_cdbs_ex_left);
cmd->state_active = false;
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}
/* transport_cmd_check_stop():
@ -498,7 +490,7 @@ static int transport_cmd_check_stop(
cmd->transport_state &= ~CMD_T_ACTIVE;
if (transport_off == 2)
transport_all_task_dev_remove_state(cmd);
target_remove_from_state_list(cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
complete(&cmd->transport_lun_stop_comp);
@ -514,7 +506,7 @@ static int transport_cmd_check_stop(
cmd->se_tfo->get_task_tag(cmd));
if (transport_off == 2)
transport_all_task_dev_remove_state(cmd);
target_remove_from_state_list(cmd);
/*
* Clear struct se_cmd->se_lun before the transport_off == 2 handoff
@ -530,7 +522,7 @@ static int transport_cmd_check_stop(
if (transport_off) {
cmd->transport_state &= ~CMD_T_ACTIVE;
if (transport_off == 2) {
transport_all_task_dev_remove_state(cmd);
target_remove_from_state_list(cmd);
/*
* Clear struct se_cmd->se_lun before the transport_off == 2
* handoff to fabric module.
@ -578,7 +570,7 @@ static void transport_lun_remove_cmd(struct se_cmd *cmd)
spin_lock_irqsave(&cmd->t_state_lock, flags);
if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
transport_all_task_dev_remove_state(cmd);
target_remove_from_state_list(cmd);
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
@ -711,7 +703,7 @@ void transport_complete_task(struct se_task *task, int success)
unsigned long flags;
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags &= ~TF_ACTIVE;
cmd->transport_state &= ~CMD_T_BUSY;
/*
* See if any sense data exists, if so set the TASK_SENSE flag.
@ -721,7 +713,6 @@ void transport_complete_task(struct se_task *task, int success)
if (dev && dev->transport->transport_complete) {
if (dev->transport->transport_complete(task) != 0) {
cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
task->task_flags |= TF_HAS_SENSE;
success = 1;
}
}
@ -730,9 +721,9 @@ void transport_complete_task(struct se_task *task, int success)
* See if we are waiting for outstanding struct se_task
* to complete for an exception condition
*/
if (task->task_flags & TF_REQUEST_STOP) {
if (cmd->transport_state & CMD_T_REQUEST_STOP) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
complete(&task->task_stop_comp);
complete(&cmd->task_stop_comp);
return;
}
@ -781,144 +772,75 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
}
EXPORT_SYMBOL(target_complete_cmd);
/*
* Called by transport_add_tasks_from_cmd() once a struct se_cmd's
* struct se_task list are ready to be added to the active execution list
* struct se_device
* Called with se_dev_t->execute_task_lock called.
*/
static inline int transport_add_task_check_sam_attr(
struct se_task *task,
struct se_device *dev)
{
/*
* No SAM Task attribute emulation enabled, add to tail of
* execution queue
*/
if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
list_add_tail(&task->t_execute_list, &dev->execute_task_list);
return 0;
}
/*
* HEAD_OF_QUEUE attribute for received CDB, which means
* the first task that is associated with a struct se_cmd goes to
* head of the struct se_device->execute_task_list.
*/
if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
list_add(&task->t_execute_list, &dev->execute_task_list);
pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
" in execution queue\n",
task->task_se_cmd->t_task_cdb[0]);
return 1;
}
/*
* For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
* transitioned from Dermant -> Active state, and are added to the end
* of the struct se_device->execute_task_list
*/
list_add_tail(&task->t_execute_list, &dev->execute_task_list);
return 0;
}
/* __transport_add_task_to_execute_queue():
*
* Called with se_dev_t->execute_task_lock called.
*/
static void __transport_add_task_to_execute_queue(
struct se_task *task,
struct se_device *dev)
{
int head_of_queue;
head_of_queue = transport_add_task_check_sam_attr(task, dev);
atomic_inc(&dev->execute_tasks);
if (task->t_state_active)
return;
/*
* Determine if this task needs to go to HEAD_OF_QUEUE for the
* state list as well. Running with SAM Task Attribute emulation
* will always return head_of_queue == 0 here
*/
if (head_of_queue)
list_add(&task->t_state_list, &dev->state_task_list);
else
list_add_tail(&task->t_state_list, &dev->state_task_list);
task->t_state_active = true;
pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
task, dev);
}
static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
static void target_add_to_state_list(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_task *task;
unsigned long flags;
spin_lock_irqsave(&cmd->t_state_lock, flags);
task = cmd->t_task;
if (task) {
if (task->task_flags & TF_ACTIVE)
goto out;
spin_lock(&dev->execute_task_lock);
if (!task->t_state_active) {
list_add_tail(&task->t_state_list,
&dev->state_task_list);
task->t_state_active = true;
pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
task->task_se_cmd->se_tfo->get_task_tag(
task->task_se_cmd), task, dev);
}
spin_unlock(&dev->execute_task_lock);
}
out:
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
}
static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
{
struct se_task *task;
task = cmd->t_task;
if (task && list_empty(&task->t_execute_list))
__transport_add_task_to_execute_queue(task, cmd->se_dev);
}
static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
{
unsigned long flags;
struct se_device *dev = cmd->se_dev;
spin_lock_irqsave(&dev->execute_task_lock, flags);
__transport_add_tasks_from_cmd(cmd);
if (!cmd->state_active) {
list_add_tail(&cmd->state_list, &dev->state_list);
cmd->state_active = true;
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}
void __transport_remove_task_from_execute_queue(struct se_task *task,
struct se_device *dev)
static void __target_add_to_execute_list(struct se_cmd *cmd)
{
list_del_init(&task->t_execute_list);
atomic_dec(&dev->execute_tasks);
struct se_device *dev = cmd->se_dev;
bool head_of_queue = false;
if (!list_empty(&cmd->execute_list))
return;
if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED &&
cmd->sam_task_attr == MSG_HEAD_TAG)
head_of_queue = true;
if (head_of_queue)
list_add(&cmd->execute_list, &dev->execute_list);
else
list_add_tail(&cmd->execute_list, &dev->execute_list);
atomic_inc(&dev->execute_tasks);
if (cmd->state_active)
return;
if (head_of_queue)
list_add(&cmd->state_list, &dev->state_list);
else
list_add_tail(&cmd->state_list, &dev->state_list);
cmd->state_active = true;
}
static void transport_remove_task_from_execute_queue(
struct se_task *task,
struct se_device *dev)
static void target_add_to_execute_list(struct se_cmd *cmd)
{
unsigned long flags;
struct se_device *dev = cmd->se_dev;
if (WARN_ON(list_empty(&task->t_execute_list)))
spin_lock_irqsave(&dev->execute_task_lock, flags);
__target_add_to_execute_list(cmd);
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}
void __target_remove_from_execute_list(struct se_cmd *cmd)
{
list_del_init(&cmd->execute_list);
atomic_dec(&cmd->se_dev->execute_tasks);
}
static void target_remove_from_execute_list(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned long flags;
if (WARN_ON(list_empty(&cmd->execute_list)))
return;
spin_lock_irqsave(&dev->execute_task_lock, flags);
__transport_remove_task_from_execute_queue(task, dev);
__target_remove_from_execute_list(cmd);
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}
@ -1342,9 +1264,9 @@ struct se_device *transport_add_device_to_core_hba(
INIT_LIST_HEAD(&dev->dev_list);
INIT_LIST_HEAD(&dev->dev_sep_list);
INIT_LIST_HEAD(&dev->dev_tmr_list);
INIT_LIST_HEAD(&dev->execute_task_list);
INIT_LIST_HEAD(&dev->execute_list);
INIT_LIST_HEAD(&dev->delayed_cmd_list);
INIT_LIST_HEAD(&dev->state_task_list);
INIT_LIST_HEAD(&dev->state_list);
INIT_LIST_HEAD(&dev->qf_cmd_list);
spin_lock_init(&dev->execute_task_lock);
spin_lock_init(&dev->delayed_cmd_lock);
@ -1482,10 +1404,13 @@ void transport_init_se_cmd(
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->execute_list);
INIT_LIST_HEAD(&cmd->state_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);
init_completion(&cmd->task_stop_comp);
spin_lock_init(&cmd->t_state_lock);
cmd->transport_state = CMD_T_DEV_ACTIVE;
@ -1495,6 +1420,8 @@ void transport_init_se_cmd(
cmd->data_direction = data_direction;
cmd->sam_task_attr = task_attr;
cmd->sense_buffer = sense_buffer;
cmd->state_active = false;
}
EXPORT_SYMBOL(transport_init_se_cmd);
@ -1855,72 +1782,31 @@ int transport_generic_handle_tmr(
EXPORT_SYMBOL(transport_generic_handle_tmr);
/*
* If the task is active, request it to be stopped and sleep until it
* If the cmd is active, request it to be stopped and sleep until it
* has completed.
*/
bool target_stop_task(struct se_task *task, unsigned long *flags)
bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
{
struct se_cmd *cmd = task->task_se_cmd;
bool was_active = false;
if (task->task_flags & TF_ACTIVE) {
task->task_flags |= TF_REQUEST_STOP;
if (cmd->transport_state & CMD_T_BUSY) {
cmd->transport_state |= CMD_T_REQUEST_STOP;
spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
pr_debug("Task %p waiting to complete\n", task);
wait_for_completion(&task->task_stop_comp);
pr_debug("Task %p stopped successfully\n", task);
pr_debug("cmd %p waiting to complete\n", cmd);
wait_for_completion(&cmd->task_stop_comp);
pr_debug("cmd %p stopped successfully\n", cmd);
spin_lock_irqsave(&cmd->t_state_lock, *flags);
atomic_dec(&cmd->t_task_cdbs_left);
task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
cmd->transport_state &= ~CMD_T_REQUEST_STOP;
cmd->transport_state &= ~CMD_T_BUSY;
was_active = true;
}
return was_active;
}
static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
{
struct se_task *task;
unsigned long flags;
int ret = 0;
pr_debug("ITT[0x%08x] - Stopping tasks\n",
cmd->se_tfo->get_task_tag(cmd));
/*
* No tasks remain in the execution queue
*/
spin_lock_irqsave(&cmd->t_state_lock, flags);
task = cmd->t_task;
if (task) {
pr_debug("Processing task %p\n", task);
/*
* If the struct se_task has not been sent and is not active,
* remove the struct se_task from the execution queue.
*/
if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
spin_unlock_irqrestore(&cmd->t_state_lock,
flags);
transport_remove_task_from_execute_queue(task,
cmd->se_dev);
pr_debug("Task %p removed from execute queue\n", task);
spin_lock_irqsave(&cmd->t_state_lock, flags);
goto out;
}
if (!target_stop_task(task, &flags)) {
pr_debug("Task %p - did nothing\n", task);
ret++;
}
}
out:
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return ret;
}
/*
* Handle SAM-esque emulation for generic transport request failures.
*/
@ -2153,11 +2039,7 @@ static int transport_execute_tasks(struct se_cmd *cmd)
add_tasks = transport_execute_task_attr(cmd);
if (!add_tasks)
goto execute_tasks;
/*
* __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
* adds associated se_tasks while holding dev->execute_task_lock
* before I/O dispath to avoid a double spinlock access.
*/
__transport_execute_tasks(se_dev, cmd);
return 0;
}
@ -2167,36 +2049,27 @@ execute_tasks:
return 0;
}
/*
* Called to check struct se_device tcq depth window, and once open pull struct se_task
* from struct se_device->execute_task_list and
*
* Called from transport_processing_thread()
*/
static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
{
int error;
struct se_cmd *cmd = NULL;
struct se_task *task = NULL;
unsigned long flags;
check_depth:
spin_lock_irq(&dev->execute_task_lock);
if (new_cmd != NULL)
__transport_add_tasks_from_cmd(new_cmd);
__target_add_to_execute_list(new_cmd);
if (list_empty(&dev->execute_task_list)) {
if (list_empty(&dev->execute_list)) {
spin_unlock_irq(&dev->execute_task_lock);
return 0;
}
task = list_first_entry(&dev->execute_task_list,
struct se_task, t_execute_list);
__transport_remove_task_from_execute_queue(task, dev);
cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
__target_remove_from_execute_list(cmd);
spin_unlock_irq(&dev->execute_task_lock);
cmd = task->task_se_cmd;
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags |= (TF_ACTIVE | TF_SENT);
cmd->transport_state |= CMD_T_BUSY;
cmd->transport_state |= CMD_T_SENT;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
@ -2204,14 +2077,14 @@ check_depth:
if (cmd->execute_cmd)
error = cmd->execute_cmd(cmd);
else
error = dev->transport->do_task(task);
error = dev->transport->do_task(cmd->t_task);
if (error != 0) {
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags &= ~TF_ACTIVE;
cmd->transport_state &= ~CMD_T_BUSY;
cmd->transport_state &= ~CMD_T_SENT;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
transport_stop_tasks_for_cmd(cmd);
transport_generic_request_failure(cmd);
}
@ -2454,42 +2327,38 @@ static int transport_get_sense_data(struct se_cmd *cmd)
return 0;
}
task = cmd->t_task;
if (task) {
if (!(task->task_flags & TF_HAS_SENSE))
goto out;
if (!cmd->t_task)
goto out;
if (!dev->transport->get_sense_buffer) {
pr_err("dev->transport->get_sense_buffer"
" is NULL\n");
goto out;
}
if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
goto out;
sense_buffer = dev->transport->get_sense_buffer(task);
if (!sense_buffer) {
pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
" sense buffer for task with sense\n",
cmd->se_tfo->get_task_tag(cmd), task);
goto out;
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
offset = cmd->se_tfo->set_fabric_sense_len(cmd,
TRANSPORT_SENSE_BUFFER);
memcpy(&buffer[offset], sense_buffer,
TRANSPORT_SENSE_BUFFER);
cmd->scsi_status = task->task_scsi_status;
/* Automatically padded */
cmd->scsi_sense_length =
(TRANSPORT_SENSE_BUFFER + offset);
pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
" and sense\n",
dev->se_hba->hba_id, dev->transport->name,
cmd->scsi_status);
return 0;
if (!dev->transport->get_sense_buffer) {
pr_err("dev->transport->get_sense_buffer is NULL\n");
goto out;
}
sense_buffer = dev->transport->get_sense_buffer(task);
if (!sense_buffer) {
pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
" sense buffer for task with sense\n",
cmd->se_tfo->get_task_tag(cmd), task);
goto out;
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
cmd->scsi_status = task->task_scsi_status;
/* Automatically padded */
cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
return 0;
out:
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return -1;
@ -3234,7 +3103,7 @@ static void transport_complete_task_attr(struct se_cmd *cmd)
cmd_p->t_task_cdb[0],
cmd_p->sam_task_attr, cmd_p->se_ordered_id);
transport_add_tasks_from_cmd(cmd_p);
target_add_to_execute_list(cmd_p);
new_active_tasks++;
spin_lock(&dev->delayed_cmd_lock);
@ -3413,7 +3282,7 @@ static void transport_free_dev_tasks(struct se_cmd *cmd)
struct se_task *task;
task = cmd->t_task;
if (task && !(task->task_flags & TF_ACTIVE))
if (task && !(cmd->transport_state & CMD_T_BUSY))
cmd->se_dev->transport->free_task(task);
}
@ -3492,7 +3361,7 @@ static void transport_put_cmd(struct se_cmd *cmd)
if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
transport_all_task_dev_remove_state(cmd);
target_remove_from_state_list(cmd);
free_tasks = 1;
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
@ -3709,9 +3578,6 @@ int transport_generic_new_cmd(struct se_cmd *cmd)
goto out_fail;
}
INIT_LIST_HEAD(&task->t_execute_list);
INIT_LIST_HEAD(&task->t_state_list);
init_completion(&task->task_stop_comp);
task->task_se_cmd = cmd;
task->task_data_direction = cmd->data_direction;
task->task_sg = cmd->t_data_sg;
@ -3733,7 +3599,7 @@ int transport_generic_new_cmd(struct se_cmd *cmd)
* thread a second time)
*/
if (cmd->data_direction == DMA_TO_DEVICE) {
transport_add_tasks_to_state_queue(cmd);
target_add_to_state_list(cmd);
return transport_generic_write_pending(cmd);
}
/*
@ -3966,8 +3832,10 @@ EXPORT_SYMBOL(target_wait_for_sess_cmds);
*/
static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
{
struct se_task *task = cmd->t_task;
unsigned long flags;
int ret;
int ret = 0;
/*
* If the frontend has already requested this struct se_cmd to
* be stopped, we can safely ignore this struct se_cmd.
@ -3987,7 +3855,18 @@ static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
ret = transport_stop_tasks_for_cmd(cmd);
// XXX: audit task_flags checks.
spin_lock_irqsave(&cmd->t_state_lock, flags);
if ((cmd->transport_state & CMD_T_BUSY) &&
(cmd->transport_state & CMD_T_SENT)) {
if (!target_stop_cmd(cmd, &flags))
ret++;
spin_lock_irqsave(&cmd->t_state_lock, flags);
} else {
spin_unlock_irqrestore(&cmd->t_state_lock,
flags);
target_remove_from_execute_list(cmd);
}
pr_debug("ConfigFS: cmd: %p stop tasks ret:"
" %d\n", cmd, ret);
@ -4062,7 +3941,7 @@ static void __transport_clear_lun_from_sessions(struct se_lun *lun)
goto check_cond;
}
cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
transport_all_task_dev_remove_state(cmd);
target_remove_from_state_list(cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
transport_free_dev_tasks(cmd);
@ -4178,7 +4057,7 @@ bool transport_wait_for_tasks(struct se_cmd *cmd)
wait_for_completion(&cmd->transport_lun_fe_stop_comp);
spin_lock_irqsave(&cmd->t_state_lock, flags);
transport_all_task_dev_remove_state(cmd);
target_remove_from_state_list(cmd);
/*
* At this point, the frontend who was the originator of this
* struct se_cmd, now owns the structure and can be released through
@ -4599,7 +4478,7 @@ get_cmd:
}
out:
WARN_ON(!list_empty(&dev->state_task_list));
WARN_ON(!list_empty(&dev->state_list));
WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
dev->process_thread = NULL;
return 0;

26
include/target/target_core_base.h
View File

@ -140,14 +140,6 @@ enum transport_tpg_type_table {
TRANSPORT_TPG_TYPE_DISCOVERY = 1,
};
/* struct se_task->task_flags */
enum se_task_flags {
TF_ACTIVE = (1 << 0),
TF_SENT = (1 << 1),
TF_REQUEST_STOP = (1 << 2),
TF_HAS_SENSE = (1 << 3),
};
/* Special transport agnostic struct se_cmd->t_states */
enum transport_state_table {
TRANSPORT_NO_STATE = 0,
@ -489,13 +481,8 @@ struct se_task {
struct se_cmd *task_se_cmd;
struct scatterlist *task_sg;
u32 task_sg_nents;
u16 task_flags;
u8 task_scsi_status;
enum dma_data_direction task_data_direction;
struct list_head t_execute_list;
struct list_head t_state_list;
bool t_state_active;
struct completion task_stop_comp;
};
struct se_tmr_req {
@ -583,6 +570,8 @@ struct se_cmd {
#define CMD_T_LUN_STOP (1 << 7)
#define CMD_T_LUN_FE_STOP (1 << 8)
#define CMD_T_DEV_ACTIVE (1 << 9)
#define CMD_T_REQUEST_STOP (1 << 10)
#define CMD_T_BUSY (1 << 11)
spinlock_t t_state_lock;
struct completion t_transport_stop_comp;
struct completion transport_lun_fe_stop_comp;
@ -596,6 +585,13 @@ struct se_cmd {
struct scatterlist *t_bidi_data_sg;
unsigned int t_bidi_data_nents;
struct list_head execute_list;
struct list_head state_list;
bool state_active;
/* old task stop completion, consider merging with some of the above */
struct completion task_stop_comp;
struct se_task *t_task;
};
@ -820,8 +816,8 @@ struct se_device {
struct task_struct *process_thread;
struct work_struct qf_work_queue;
struct list_head delayed_cmd_list;
struct list_head execute_task_list;
struct list_head state_task_list;
struct list_head execute_list;
struct list_head state_list;
struct list_head qf_cmd_list;
/* Pointer to associated SE HBA */
struct se_hba *se_hba;