From 0ab710458da113a71c461c4df27e7f1353d9f864 Mon Sep 17 00:00:00 2001 From: Bharath Ravi Date: Sat, 25 Jan 2020 01:19:25 -0500 Subject: scsi: iscsi: Perform connection failure entirely in kernel space Connection failure processing depends on a daemon being present to (at least) stop the connection and start recovery. This is a problem on a multipath scenario, where if the daemon failed for whatever reason, the SCSI path is never marked as down, multipath won't perform the failover and IO to the device will be forever waiting for that connection to come back. This patch performs the connection failure entirely inside the kernel. This way, the failover can happen and pending IO can continue even if the daemon is dead. Once the daemon comes alive again, it can execute recovery procedures if applicable. Cc: Mike Christie Cc: Lee Duncan Cc: Bart Van Assche Link: https://lore.kernel.org/r/20200125061925.191601-1-krisman@collabora.com Co-developed-by: Dave Clausen Co-developed-by: Nick Black Co-developed-by: Vaibhav Nagarnaik Co-developed-by: Anatol Pomazau Co-developed-by: Tahsin Erdogan Co-developed-by: Frank Mayhar Co-developed-by: Junho Ryu Co-developed-by: Khazhismel Kumykov Reviewed-by: Reviewed-by: Khazhismel Kumykov Co-developed-by: Gabriel Krisman Bertazi Reviewed-by: Lee Duncan Signed-off-by: Bharath Ravi Signed-off-by: Dave Clausen Signed-off-by: Nick Black Signed-off-by: Vaibhav Nagarnaik Signed-off-by: Anatol Pomazau Signed-off-by: Tahsin Erdogan Signed-off-by: Frank Mayhar Signed-off-by: Junho Ryu Signed-off-by: Khazhismel Kumykov Signed-off-by: Gabriel Krisman Bertazi Signed-off-by: Martin K. Petersen --- include/scsi/scsi_transport_iscsi.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h index 325ae731d9ad..2129dc9e2dec 100644 --- a/include/scsi/scsi_transport_iscsi.h +++ b/include/scsi/scsi_transport_iscsi.h @@ -190,6 +190,7 @@ extern void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_cls_conn { struct list_head conn_list; /* item in connlist */ + struct list_head conn_list_err; /* item in connlist_err */ void *dd_data; /* LLD private data */ struct iscsi_transport *transport; uint32_t cid; /* connection id */ -- cgit v1.2.3