diff options
| -rw-r--r-- | drivers/infiniband/ulp/isert/ib_isert.c | 2 | ||||
| -rw-r--r-- | drivers/infiniband/ulp/srpt/ib_srpt.c | 2 | ||||
| -rw-r--r-- | drivers/scsi/qla2xxx/tcm_qla2xxx.c | 9 | ||||
| -rw-r--r-- | drivers/target/target_core_tpg.c | 2 | ||||
| -rw-r--r-- | drivers/target/target_core_transport.c | 77 | ||||
| -rw-r--r-- | drivers/target/tcm_fc/tfc_sess.c | 2 | ||||
| -rw-r--r-- | include/target/target_core_base.h | 6 | ||||
| -rw-r--r-- | include/target/target_core_fabric.h | 2 |
8 files changed, 43 insertions, 59 deletions
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c index a3ba0c4d0d39..67f65dcb15a6 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.c +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -2471,7 +2471,7 @@ isert_wait4cmds(struct iscsi_conn *conn) isert_info("iscsi_conn %p\n", conn); if (conn->sess) { - target_sess_cmd_list_set_waiting(conn->sess->se_sess); + target_stop_session(conn->sess->se_sess); target_wait_for_sess_cmds(conn->sess->se_sess); } } diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c index 0065eb17ae36..8377113c85ba 100644 --- a/drivers/infiniband/ulp/srpt/ib_srpt.c +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c @@ -2084,7 +2084,7 @@ static void srpt_release_channel_work(struct work_struct *w) se_sess = ch->sess; BUG_ON(!se_sess); - target_sess_cmd_list_set_waiting(se_sess); + target_stop_session(se_sess); target_wait_for_sess_cmds(se_sess); target_remove_session(se_sess); diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c index e122da98eda7..784b43f18181 100644 --- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c +++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c @@ -368,15 +368,10 @@ static void tcm_qla2xxx_put_sess(struct fc_port *sess) static void tcm_qla2xxx_close_session(struct se_session *se_sess) { struct fc_port *sess = se_sess->fabric_sess_ptr; - struct scsi_qla_host *vha; - unsigned long flags; BUG_ON(!sess); - vha = sess->vha; - spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags); - target_sess_cmd_list_set_waiting(se_sess); - spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags); + target_stop_session(se_sess); sess->explicit_logout = 1; tcm_qla2xxx_put_sess(sess); @@ -831,7 +826,7 @@ static void tcm_qla2xxx_clear_nacl_from_fcport_map(struct fc_port *sess) static void tcm_qla2xxx_shutdown_sess(struct fc_port *sess) { - target_sess_cmd_list_set_waiting(sess->se_sess); + target_stop_session(sess->se_sess); } static int tcm_qla2xxx_init_nodeacl(struct se_node_acl *se_nacl, diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c index 62aa5fa63ac0..736847c933e5 100644 --- a/drivers/target/target_core_tpg.c +++ b/drivers/target/target_core_tpg.c @@ -328,7 +328,7 @@ static void target_shutdown_sessions(struct se_node_acl *acl) restart: spin_lock_irqsave(&acl->nacl_sess_lock, flags); list_for_each_entry(sess, &acl->acl_sess_list, sess_acl_list) { - if (sess->sess_tearing_down) + if (atomic_read(&sess->stopped)) continue; list_del_init(&sess->sess_acl_list); diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index faf1bab454d4..485317c02056 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -215,7 +215,7 @@ static void target_release_sess_cmd_refcnt(struct percpu_ref *ref) { struct se_session *sess = container_of(ref, typeof(*sess), cmd_count); - wake_up(&sess->cmd_list_wq); + wake_up(&sess->cmd_count_wq); } /** @@ -228,9 +228,10 @@ int transport_init_session(struct se_session *se_sess) { INIT_LIST_HEAD(&se_sess->sess_list); INIT_LIST_HEAD(&se_sess->sess_acl_list); - INIT_LIST_HEAD(&se_sess->sess_cmd_list); spin_lock_init(&se_sess->sess_cmd_lock); - init_waitqueue_head(&se_sess->cmd_list_wq); + init_waitqueue_head(&se_sess->cmd_count_wq); + init_completion(&se_sess->stop_done); + atomic_set(&se_sess->stopped, 0); return percpu_ref_init(&se_sess->cmd_count, target_release_sess_cmd_refcnt, 0, GFP_KERNEL); } @@ -239,11 +240,11 @@ EXPORT_SYMBOL(transport_init_session); void transport_uninit_session(struct se_session *se_sess) { /* - * Drivers like iscsi and loop do not call - * target_sess_cmd_list_set_waiting during session shutdown so we - * have to drop the ref taken at init time here. + * Drivers like iscsi and loop do not call target_stop_session + * during session shutdown so we have to drop the ref taken at init + * time here. */ - if (!se_sess->sess_tearing_down) + if (!atomic_read(&se_sess->stopped)) percpu_ref_put(&se_sess->cmd_count); percpu_ref_exit(&se_sess->cmd_count); @@ -1632,9 +1633,8 @@ int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess if (flags & TARGET_SCF_UNKNOWN_SIZE) se_cmd->unknown_data_length = 1; /* - * Obtain struct se_cmd->cmd_kref reference and add new cmd to - * se_sess->sess_cmd_list. A second kref_get here is necessary - * for fabrics using TARGET_SCF_ACK_KREF that expect a second + * Obtain struct se_cmd->cmd_kref reference. A second kref_get here is + * necessary for fabrics using TARGET_SCF_ACK_KREF that expect a second * kref_put() to happen during fabric packet acknowledgement. */ ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); @@ -2763,14 +2763,13 @@ int 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 + * target_get_sess_cmd - Verify the session is accepting cmds and take ref * @se_cmd: command descriptor to add * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() */ int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) { struct se_session *se_sess = se_cmd->se_sess; - unsigned long flags; int ret = 0; /* @@ -2785,15 +2784,8 @@ int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) se_cmd->se_cmd_flags |= SCF_ACK_KREF; } - spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); - if (se_sess->sess_tearing_down) { + if (!percpu_ref_tryget_live(&se_sess->cmd_count)) ret = -ESHUTDOWN; - goto out; - } - list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); - percpu_ref_get(&se_sess->cmd_count); -out: - spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); if (ret && ack_kref) target_put_sess_cmd(se_cmd); @@ -2818,13 +2810,6 @@ static void target_release_cmd_kref(struct kref *kref) struct se_session *se_sess = se_cmd->se_sess; struct completion *free_compl = se_cmd->free_compl; struct completion *abrt_compl = se_cmd->abrt_compl; - unsigned long flags; - - if (se_sess) { - spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); - list_del_init(&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); @@ -2952,21 +2937,25 @@ void target_show_cmd(const char *pfx, struct se_cmd *cmd) } EXPORT_SYMBOL(target_show_cmd); +static void target_stop_session_confirm(struct percpu_ref *ref) +{ + struct se_session *se_sess = container_of(ref, struct se_session, + cmd_count); + complete_all(&se_sess->stop_done); +} + /** - * target_sess_cmd_list_set_waiting - Set sess_tearing_down so no new commands are queued. - * @se_sess: session to flag + * target_stop_session - Stop new IO from being queued on the session. + * @se_sess: session to stop */ -void target_sess_cmd_list_set_waiting(struct se_session *se_sess) +void target_stop_session(struct se_session *se_sess) { - unsigned long flags; - - spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); - se_sess->sess_tearing_down = 1; - spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); - - percpu_ref_kill(&se_sess->cmd_count); + pr_debug("Stopping session queue.\n"); + if (atomic_cmpxchg(&se_sess->stopped, 0, 1) == 0) + percpu_ref_kill_and_confirm(&se_sess->cmd_count, + target_stop_session_confirm); } -EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); +EXPORT_SYMBOL(target_stop_session); /** * target_wait_for_sess_cmds - Wait for outstanding commands @@ -2974,19 +2963,19 @@ EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); */ void target_wait_for_sess_cmds(struct se_session *se_sess) { - struct se_cmd *cmd; int ret; - WARN_ON_ONCE(!se_sess->sess_tearing_down); + WARN_ON_ONCE(!atomic_read(&se_sess->stopped)); do { - ret = wait_event_timeout(se_sess->cmd_list_wq, + pr_debug("Waiting for running cmds to complete.\n"); + ret = wait_event_timeout(se_sess->cmd_count_wq, percpu_ref_is_zero(&se_sess->cmd_count), 180 * HZ); - list_for_each_entry(cmd, &se_sess->sess_cmd_list, se_cmd_list) - target_show_cmd("session shutdown: still waiting for ", - cmd); } while (ret <= 0); + + wait_for_completion(&se_sess->stop_done); + pr_debug("Waiting for cmds done.\n"); } EXPORT_SYMBOL(target_wait_for_sess_cmds); diff --git a/drivers/target/tcm_fc/tfc_sess.c b/drivers/target/tcm_fc/tfc_sess.c index 4fd6a1de947c..23ce506d5402 100644 --- a/drivers/target/tcm_fc/tfc_sess.c +++ b/drivers/target/tcm_fc/tfc_sess.c @@ -275,7 +275,7 @@ static struct ft_sess *ft_sess_delete(struct ft_tport *tport, u32 port_id) static void ft_close_sess(struct ft_sess *sess) { - target_sess_cmd_list_set_waiting(sess->se_sess); + target_stop_session(sess->se_sess); target_wait_for_sess_cmds(sess->se_sess); ft_sess_put(sess); } diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 7d632593c398..c858dc060381 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -608,7 +608,7 @@ static inline struct se_node_acl *fabric_stat_to_nacl(struct config_item *item) } struct se_session { - unsigned sess_tearing_down:1; + atomic_t stopped; u64 sess_bin_isid; enum target_prot_op sup_prot_ops; enum target_prot_type sess_prot_type; @@ -618,9 +618,9 @@ struct se_session { struct percpu_ref cmd_count; struct list_head sess_list; struct list_head sess_acl_list; - struct list_head sess_cmd_list; spinlock_t sess_cmd_lock; - wait_queue_head_t cmd_list_wq; + wait_queue_head_t cmd_count_wq; + struct completion stop_done; void *sess_cmd_map; struct sbitmap_queue sess_tag_pool; }; diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h index 6adf4d71acf6..d60a3eb7517a 100644 --- a/include/target/target_core_fabric.h +++ b/include/target/target_core_fabric.h @@ -178,7 +178,7 @@ int transport_send_check_condition_and_sense(struct se_cmd *, int target_send_busy(struct se_cmd *cmd); int target_get_sess_cmd(struct se_cmd *, bool); int target_put_sess_cmd(struct se_cmd *); -void target_sess_cmd_list_set_waiting(struct se_session *); +void target_stop_session(struct se_session *se_sess); void target_wait_for_sess_cmds(struct se_session *); void target_show_cmd(const char *pfx, struct se_cmd *cmd); |