From: Nicholas Bellinger Date: Sun, 6 Mar 2016 01:24:27 +0000 (+0000) Subject: target: Fix remote-port TMR ABORT + se_cmd fabric stop X-Git-Tag: v4.1.20~93 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=08367c9e8f0337b0fea23acb459fb4bc40cb7be7;p=platform%2Fkernel%2Flinux-exynos.git target: Fix remote-port TMR ABORT + se_cmd fabric stop commit 0f4a943168f31d29a1701908931acaba518b131a upstream. To address the bug where fabric driver level shutdown of se_cmd occurs at the same time when TMR CMD_T_ABORTED is happening resulting in a -1 ->cmd_kref, this patch adds a CMD_T_FABRIC_STOP bit that is used to determine when TMR + driver I_T nexus shutdown is happening concurrently. It changes target_sess_cmd_list_set_waiting() to obtain se_cmd->cmd_kref + set CMD_T_FABRIC_STOP, and drop local reference in target_wait_for_sess_cmds() and invoke extra target_put_sess_cmd() during Task Aborted Status (TAS) when necessary. Also, it adds a new target_wait_free_cmd() wrapper around transport_wait_for_tasks() for the special case within transport_generic_free_cmd() to set CMD_T_FABRIC_STOP, and is now aware of CMD_T_ABORTED + CMD_T_TAS status bits to know when an extra transport_put_cmd() during TAS is required. Note transport_generic_free_cmd() is expected to block on cmd->cmd_wait_comp in order to follow what iscsi-target expects during iscsi_conn context se_cmd shutdown. Cc: Quinn Tran Cc: Himanshu Madhani Cc: Sagi Grimberg Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Andy Grover Cc: Mike Christie Signed-off-by: Nicholas Bellinger Signed-off-by: Sasha Levin --- diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c index a7e15b3..ad48837 100644 --- a/drivers/target/target_core_tmr.c +++ b/drivers/target/target_core_tmr.c @@ -78,16 +78,18 @@ void core_tmr_release_req(struct se_tmr_req *tmr) kfree(tmr); } -static void core_tmr_handle_tas_abort( - struct se_session *tmr_sess, - struct se_cmd *cmd, - int tas) +static void core_tmr_handle_tas_abort(struct se_cmd *cmd, int tas) { - bool remove = true; + unsigned long flags; + bool remove = true, send_tas; /* * TASK ABORTED status (TAS) bit support */ - if (tmr_sess && tmr_sess != cmd->se_sess && tas) { + spin_lock_irqsave(&cmd->t_state_lock, flags); + send_tas = (cmd->transport_state & CMD_T_TAS); + spin_unlock_irqrestore(&cmd->t_state_lock, flags); + + if (send_tas) { remove = false; transport_send_task_abort(cmd); } @@ -110,7 +112,8 @@ static int target_check_cdb_and_preempt(struct list_head *list, return 1; } -static bool __target_check_io_state(struct se_cmd *se_cmd) +static bool __target_check_io_state(struct se_cmd *se_cmd, + struct se_session *tmr_sess, int tas) { struct se_session *sess = se_cmd->se_sess; @@ -118,21 +121,33 @@ static bool __target_check_io_state(struct se_cmd *se_cmd) WARN_ON_ONCE(!irqs_disabled()); /* * If command already reached CMD_T_COMPLETE state within - * target_complete_cmd(), this se_cmd has been passed to - * fabric driver and will not be aborted. + * target_complete_cmd() or CMD_T_FABRIC_STOP due to shutdown, + * this se_cmd has been passed to fabric driver and will + * not be aborted. * * Otherwise, obtain a local se_cmd->cmd_kref now for TMR * ABORT_TASK + LUN_RESET for CMD_T_ABORTED processing as * long as se_cmd->cmd_kref is still active unless zero. */ spin_lock(&se_cmd->t_state_lock); - if (se_cmd->transport_state & CMD_T_COMPLETE) { - pr_debug("Attempted to abort io tag: %u already complete," + if (se_cmd->transport_state & (CMD_T_COMPLETE | CMD_T_FABRIC_STOP)) { + pr_debug("Attempted to abort io tag: %u already complete or" + " fabric stop, skipping\n", + se_cmd->se_tfo->get_task_tag(se_cmd)); + spin_unlock(&se_cmd->t_state_lock); + return false; + } + if (sess->sess_tearing_down || se_cmd->cmd_wait_set) { + pr_debug("Attempted to abort io tag: %u already shutdown," " skipping\n", se_cmd->se_tfo->get_task_tag(se_cmd)); spin_unlock(&se_cmd->t_state_lock); return false; } se_cmd->transport_state |= CMD_T_ABORTED; + + if ((tmr_sess != se_cmd->se_sess) && tas) + se_cmd->transport_state |= CMD_T_TAS; + spin_unlock(&se_cmd->t_state_lock); return kref_get_unless_zero(&se_cmd->cmd_kref); @@ -164,7 +179,7 @@ void core_tmr_abort_task( printk("ABORT_TASK: Found referenced %s task_tag: %u\n", se_cmd->se_tfo->get_fabric_name(), ref_tag); - if (!__target_check_io_state(se_cmd)) { + if (!__target_check_io_state(se_cmd, se_sess, 0)) { spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); target_put_sess_cmd(se_cmd); goto out; @@ -234,7 +249,8 @@ static void core_tmr_drain_tmr_list( spin_lock(&sess->sess_cmd_lock); spin_lock(&cmd->t_state_lock); - if (!(cmd->transport_state & CMD_T_ACTIVE)) { + if (!(cmd->transport_state & CMD_T_ACTIVE) || + (cmd->transport_state & CMD_T_FABRIC_STOP)) { spin_unlock(&cmd->t_state_lock); spin_unlock(&sess->sess_cmd_lock); continue; @@ -244,15 +260,22 @@ static void core_tmr_drain_tmr_list( spin_unlock(&sess->sess_cmd_lock); continue; } + if (sess->sess_tearing_down || cmd->cmd_wait_set) { + spin_unlock(&cmd->t_state_lock); + spin_unlock(&sess->sess_cmd_lock); + continue; + } cmd->transport_state |= CMD_T_ABORTED; spin_unlock(&cmd->t_state_lock); rc = kref_get_unless_zero(&cmd->cmd_kref); - spin_unlock(&sess->sess_cmd_lock); if (!rc) { printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n"); + spin_unlock(&sess->sess_cmd_lock); continue; } + spin_unlock(&sess->sess_cmd_lock); + list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); } spin_unlock_irqrestore(&dev->se_tmr_lock, flags); @@ -329,7 +352,7 @@ static void core_tmr_drain_state_list( continue; spin_lock(&sess->sess_cmd_lock); - rc = __target_check_io_state(cmd); + rc = __target_check_io_state(cmd, tmr_sess, tas); spin_unlock(&sess->sess_cmd_lock); if (!rc) continue; @@ -368,7 +391,7 @@ static void core_tmr_drain_state_list( cancel_work_sync(&cmd->work); transport_wait_for_tasks(cmd); - core_tmr_handle_tas_abort(tmr_sess, cmd, tas); + core_tmr_handle_tas_abort(cmd, tas); target_put_sess_cmd(cmd); } } diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 458ecbd..43b6ee9 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -2420,18 +2420,33 @@ static void transport_write_pending_qf(struct se_cmd *cmd) } } +static bool +__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *, + unsigned long *flags); + +static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas) +{ + unsigned long flags; + + spin_lock_irqsave(&cmd->t_state_lock, flags); + __transport_wait_for_tasks(cmd, true, aborted, tas, &flags); + spin_unlock_irqrestore(&cmd->t_state_lock, flags); +} + int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) { int ret = 0; + bool aborted = false, tas = false; if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) - transport_wait_for_tasks(cmd); + target_wait_free_cmd(cmd, &aborted, &tas); - ret = transport_put_cmd(cmd); + if (!aborted || tas) + ret = transport_put_cmd(cmd); } else { if (wait_for_tasks) - transport_wait_for_tasks(cmd); + target_wait_free_cmd(cmd, &aborted, &tas); /* * Handle WRITE failure case where transport_generic_new_cmd() * has already added se_cmd to state_list, but fabric has @@ -2443,7 +2458,21 @@ int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) if (cmd->se_lun) transport_lun_remove_cmd(cmd); - ret = transport_put_cmd(cmd); + if (!aborted || tas) + ret = transport_put_cmd(cmd); + } + /* + * If the task has been internally aborted due to TMR ABORT_TASK + * or LUN_RESET, target_core_tmr.c is responsible for performing + * the remaining calls to target_put_sess_cmd(), and not the + * callers of this function. + */ + if (aborted) { + pr_debug("Detected CMD_T_ABORTED for ITT: %u\n", + cmd->se_tfo->get_task_tag(cmd)); + wait_for_completion(&cmd->cmd_wait_comp); + cmd->se_tfo->release_cmd(cmd); + ret = 1; } return ret; } @@ -2498,6 +2527,7 @@ static void target_release_cmd_kref(struct kref *kref) { struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); struct se_session *se_sess = se_cmd->se_sess; + bool fabric_stop; if (list_empty(&se_cmd->se_cmd_list)) { spin_unlock(&se_sess->sess_cmd_lock); @@ -2505,13 +2535,19 @@ static void target_release_cmd_kref(struct kref *kref) se_cmd->se_tfo->release_cmd(se_cmd); return; } - if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { + + spin_lock(&se_cmd->t_state_lock); + fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP); + spin_unlock(&se_cmd->t_state_lock); + + if (se_cmd->cmd_wait_set || fabric_stop) { + list_del_init(&se_cmd->se_cmd_list); spin_unlock(&se_sess->sess_cmd_lock); target_free_cmd_mem(se_cmd); complete(&se_cmd->cmd_wait_comp); return; } - list_del(&se_cmd->se_cmd_list); + list_del_init(&se_cmd->se_cmd_list); spin_unlock(&se_sess->sess_cmd_lock); target_free_cmd_mem(se_cmd); @@ -2544,6 +2580,7 @@ void target_sess_cmd_list_set_waiting(struct se_session *se_sess) { struct se_cmd *se_cmd; unsigned long flags; + int rc; spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); if (se_sess->sess_tearing_down) { @@ -2553,8 +2590,15 @@ void target_sess_cmd_list_set_waiting(struct se_session *se_sess) 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; + list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) { + rc = kref_get_unless_zero(&se_cmd->cmd_kref); + if (rc) { + se_cmd->cmd_wait_set = 1; + spin_lock(&se_cmd->t_state_lock); + se_cmd->transport_state |= CMD_T_FABRIC_STOP; + spin_unlock(&se_cmd->t_state_lock); + } + } spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); } @@ -2567,15 +2611,25 @@ void target_wait_for_sess_cmds(struct se_session *se_sess) { struct se_cmd *se_cmd, *tmp_cmd; unsigned long flags; + bool tas; list_for_each_entry_safe(se_cmd, tmp_cmd, &se_sess->sess_wait_list, se_cmd_list) { - list_del(&se_cmd->se_cmd_list); + list_del_init(&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)); + spin_lock_irqsave(&se_cmd->t_state_lock, flags); + tas = (se_cmd->transport_state & CMD_T_TAS); + spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); + + if (!target_put_sess_cmd(se_cmd)) { + if (tas) + target_put_sess_cmd(se_cmd); + } + 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, @@ -2618,34 +2672,38 @@ int transport_clear_lun_ref(struct se_lun *lun) return 0; } -/** - * transport_wait_for_tasks - wait for completion to occur - * @cmd: command to wait - * - * Called from frontend fabric context to wait for storage engine - * to pause and/or release frontend generated struct se_cmd. - */ -bool transport_wait_for_tasks(struct se_cmd *cmd) +static bool +__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop, + bool *aborted, bool *tas, unsigned long *flags) + __releases(&cmd->t_state_lock) + __acquires(&cmd->t_state_lock) { - unsigned long flags; - spin_lock_irqsave(&cmd->t_state_lock, flags); + assert_spin_locked(&cmd->t_state_lock); + WARN_ON_ONCE(!irqs_disabled()); + + if (fabric_stop) + cmd->transport_state |= CMD_T_FABRIC_STOP; + + if (cmd->transport_state & CMD_T_ABORTED) + *aborted = true; + + if (cmd->transport_state & CMD_T_TAS) + *tas = true; + if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && - !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { - spin_unlock_irqrestore(&cmd->t_state_lock, flags); + !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) return false; - } if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && - !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { - spin_unlock_irqrestore(&cmd->t_state_lock, flags); + !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) return false; - } - if (!(cmd->transport_state & CMD_T_ACTIVE)) { - spin_unlock_irqrestore(&cmd->t_state_lock, flags); + if (!(cmd->transport_state & CMD_T_ACTIVE)) + return false; + + if (fabric_stop && *aborted) return false; - } cmd->transport_state |= CMD_T_STOP; @@ -2654,20 +2712,37 @@ bool transport_wait_for_tasks(struct se_cmd *cmd) cmd, cmd->se_tfo->get_task_tag(cmd), cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); - spin_unlock_irqrestore(&cmd->t_state_lock, flags); + spin_unlock_irqrestore(&cmd->t_state_lock, *flags); wait_for_completion(&cmd->t_transport_stop_comp); - spin_lock_irqsave(&cmd->t_state_lock, flags); + spin_lock_irqsave(&cmd->t_state_lock, *flags); cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); pr_debug("wait_for_tasks: Stopped wait_for_completion(" "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", cmd->se_tfo->get_task_tag(cmd)); + return true; +} + +/** + * transport_wait_for_tasks - wait for completion to occur + * @cmd: command to wait + * + * Called from frontend fabric context to wait for storage engine + * to pause and/or release frontend generated struct se_cmd. + */ +bool transport_wait_for_tasks(struct se_cmd *cmd) +{ + unsigned long flags; + bool ret, aborted = false, tas = false; + + spin_lock_irqsave(&cmd->t_state_lock, flags); + ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags); spin_unlock_irqrestore(&cmd->t_state_lock, flags); - return true; + return ret; } EXPORT_SYMBOL(transport_wait_for_tasks); diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index f8a1b85..2b40a1f 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -538,6 +538,8 @@ struct se_cmd { #define CMD_T_DEV_ACTIVE (1 << 7) #define CMD_T_REQUEST_STOP (1 << 8) #define CMD_T_BUSY (1 << 9) +#define CMD_T_TAS (1 << 10) +#define CMD_T_FABRIC_STOP (1 << 11) spinlock_t t_state_lock; struct completion t_transport_stop_comp;