diff options
Diffstat (limited to 'drivers/scsi/libiscsi.c')
| -rw-r--r-- | drivers/scsi/libiscsi.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 67b2a2b0028..8dc73c489a1 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -1571,6 +1571,12 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) goto fault; } + if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { + reason = FAILURE_SESSION_IN_RECOVERY; + sc->result = DID_REQUEUE; + goto fault; + } + if (iscsi_check_cmdsn_window_closed(conn)) { reason = FAILURE_WINDOW_CLOSED; goto reject; @@ -1810,6 +1816,33 @@ static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun, } } +/** + * iscsi_suspend_queue - suspend iscsi_queuecommand + * @conn: iscsi conn to stop queueing IO on + * + * This grabs the session lock to make sure no one is in + * xmit_task/queuecommand, and then sets suspend to prevent + * new commands from being queued. This only needs to be called + * by offload drivers that need to sync a path like ep disconnect + * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi + * will call iscsi_start_tx and iscsi_unblock_session when in FFP. + */ +void iscsi_suspend_queue(struct iscsi_conn *conn) +{ + spin_lock_bh(&conn->session->lock); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + spin_unlock_bh(&conn->session->lock); +} +EXPORT_SYMBOL_GPL(iscsi_suspend_queue); + +/** + * iscsi_suspend_tx - suspend iscsi_data_xmit + * @conn: iscsi conn tp stop processing IO on. + * + * This function sets the suspend bit to prevent iscsi_data_xmit + * from sending new IO, and if work is queued on the xmit thread + * it will wait for it to be completed. + */ void iscsi_suspend_tx(struct iscsi_conn *conn) { struct Scsi_Host *shost = conn->session->host; |