INIT_LIST_HEAD(&se_sess->sess_cmd_list);
INIT_LIST_HEAD(&se_sess->sess_wait_list);
spin_lock_init(&se_sess->sess_cmd_lock);
- kref_init(&se_sess->sess_kref);
se_sess->sup_prot_ops = sup_prot_ops;
return se_sess;
}
EXPORT_SYMBOL(target_alloc_session);
-static void target_release_session(struct kref *kref)
-{
- struct se_session *se_sess = container_of(kref,
- struct se_session, sess_kref);
- struct se_portal_group *se_tpg = se_sess->se_tpg;
-
- se_tpg->se_tpg_tfo->close_session(se_sess);
-}
-
-int target_get_session(struct se_session *se_sess)
-{
- return kref_get_unless_zero(&se_sess->sess_kref);
-}
-EXPORT_SYMBOL(target_get_session);
-
-void target_put_session(struct se_session *se_sess)
-{
- kref_put(&se_sess->sess_kref, target_release_session);
-}
-EXPORT_SYMBOL(target_put_session);
-
ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
{
struct se_session *se_sess;
se_nacl = se_sess->se_node_acl;
if (se_nacl) {
spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
- if (se_nacl->acl_stop == 0)
- list_del(&se_sess->sess_acl_list);
+ if (!list_empty(&se_sess->sess_acl_list))
+ list_del_init(&se_sess->sess_acl_list);
/*
* If the session list is empty, then clear the pointer.
* Otherwise, set the struct se_session pointer from the tail
void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
{
- if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
+ if (scsi_status != SAM_STAT_GOOD) {
+ return;
+ }
+
+ /*
+ * Calculate new residual count based upon length of SCSI data
+ * transferred.
+ */
+ if (length < cmd->data_length) {
if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
cmd->residual_count += cmd->data_length - length;
} else {
}
cmd->data_length = length;
+ } else if (length > cmd->data_length) {
+ cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
+ cmd->residual_count = length - cmd->data_length;
+ } else {
+ cmd->se_cmd_flags &= ~(SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT);
+ cmd->residual_count = 0;
}
target_complete_cmd(cmd, scsi_status);
trace_target_sequencer_start(cmd);
- /*
- * Check for an existing UNIT ATTENTION condition
- */
- ret = target_scsi3_ua_check(cmd);
- if (ret)
- return ret;
-
- ret = target_alua_state_check(cmd);
- if (ret)
- return ret;
-
- ret = target_check_reservation(cmd);
- if (ret) {
- cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
- return ret;
- }
-
ret = dev->transport->parse_cdb(cmd);
if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
}
EXPORT_SYMBOL(transport_generic_request_failure);
-void __target_execute_cmd(struct se_cmd *cmd)
+void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
{
sense_reason_t ret;
- if (cmd->execute_cmd) {
- ret = cmd->execute_cmd(cmd);
- if (ret) {
- spin_lock_irq(&cmd->t_state_lock);
- cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
- spin_unlock_irq(&cmd->t_state_lock);
+ if (!cmd->execute_cmd) {
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ goto err;
+ }
+ if (do_checks) {
+ /*
+ * Check for an existing UNIT ATTENTION condition after
+ * target_handle_task_attr() has done SAM task attr
+ * checking, and possibly have already defered execution
+ * out to target_restart_delayed_cmds() context.
+ */
+ ret = target_scsi3_ua_check(cmd);
+ if (ret)
+ goto err;
+
+ ret = target_alua_state_check(cmd);
+ if (ret)
+ goto err;
- transport_generic_request_failure(cmd, ret);
+ ret = target_check_reservation(cmd);
+ if (ret) {
+ cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
+ goto err;
}
}
+
+ ret = cmd->execute_cmd(cmd);
+ if (!ret)
+ return;
+err:
+ spin_lock_irq(&cmd->t_state_lock);
+ cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
+ spin_unlock_irq(&cmd->t_state_lock);
+
+ transport_generic_request_failure(cmd, ret);
}
static int target_write_prot_action(struct se_cmd *cmd)
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
return false;
+ cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
+
/*
* Check for the existence of HEAD_OF_QUEUE, and if true return 1
* to allow the passed struct se_cmd list of tasks to the front of the list.
return;
}
- __target_execute_cmd(cmd);
+ __target_execute_cmd(cmd, true);
}
EXPORT_SYMBOL(target_execute_cmd);
list_del(&cmd->se_delayed_node);
spin_unlock(&dev->delayed_cmd_lock);
- __target_execute_cmd(cmd);
+ __target_execute_cmd(cmd, true);
if (cmd->sam_task_attr == TCM_ORDERED_TAG)
break;
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
return;
+ if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
+ goto restart;
+
if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
atomic_dec_mb(&dev->simple_cmds);
dev->dev_cur_ordered_id++;
pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
dev->dev_cur_ordered_id);
}
-
+restart:
target_restart_delayed_cmds(dev);
}
transport_handle_queue_full(cmd, cmd->se_dev);
}
-static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
+void target_free_sgl(struct scatterlist *sgl, int nents)
{
struct scatterlist *sg;
int count;
kfree(sgl);
}
+EXPORT_SYMBOL(target_free_sgl);
static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
{
static inline void transport_free_pages(struct se_cmd *cmd)
{
if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
- transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
+ target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
cmd->t_prot_sg = NULL;
cmd->t_prot_nents = 0;
}
* SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
*/
if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
- transport_free_sgl(cmd->t_bidi_data_sg,
+ target_free_sgl(cmd->t_bidi_data_sg,
cmd->t_bidi_data_nents);
cmd->t_bidi_data_sg = NULL;
cmd->t_bidi_data_nents = 0;
}
transport_reset_sgl_orig(cmd);
- transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
+ target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
cmd->t_data_sg = NULL;
cmd->t_data_nents = 0;
- transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
+ target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
cmd->t_bidi_data_sg = NULL;
cmd->t_bidi_data_nents = 0;
}
int
target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
- bool zero_page)
+ bool zero_page, bool chainable)
{
struct scatterlist *sg;
struct page *page;
gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
- unsigned int nent;
+ unsigned int nalloc, nent;
int i = 0;
- nent = DIV_ROUND_UP(length, PAGE_SIZE);
- sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
+ nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
+ if (chainable)
+ nalloc++;
+ sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
if (!sg)
return -ENOMEM;
- sg_init_table(sg, nent);
+ sg_init_table(sg, nalloc);
while (length) {
u32 page_len = min_t(u32, length, PAGE_SIZE);
kfree(sg);
return -ENOMEM;
}
+EXPORT_SYMBOL(target_alloc_sgl);
/*
* Allocate any required resources to execute the command. For writes we
if (cmd->prot_op != TARGET_PROT_NORMAL &&
!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
- cmd->prot_length, true);
+ cmd->prot_length, true, false);
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
&cmd->t_bidi_data_nents,
- bidi_length, zero_flag);
+ bidi_length, zero_flag, false);
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
- cmd->data_length, zero_flag);
+ cmd->data_length, zero_flag, false);
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
} else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
&cmd->t_bidi_data_nents,
- caw_length, zero_flag);
+ caw_length, zero_flag, false);
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
bool fabric_stop;
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);
- target_free_cmd_mem(se_cmd);
- se_cmd->se_tfo->release_cmd(se_cmd);
- return;
- }
spin_lock(&se_cmd->t_state_lock);
- fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP);
+ fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
+ (se_cmd->transport_state & CMD_T_ABORTED);
spin_unlock(&se_cmd->t_state_lock);
if (se_cmd->cmd_wait_set || fabric_stop) {
projects / cascardo / linux.git / blobdiff