lkml.org 
[lkml]   [2020]   [Jan]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/3] iscsi: Fail session and connection on transport registration failure
Date
If the transport cannot be registered, the session/connection creation
needs to be failed early to let the initiator know. Otherwise, the
system will have an outstanding connection that cannot be used nor
removed by open-iscsi. The result is similar to the error below,
triggered by injecting a failure in the transport's registration path.

openiscsi reports success:

root@debian-vm:~# iscsiadm -m node -T iqn:lun1 -p 127.0.0.1 -l
Logging in to [iface: default, target: iqn:lun1, portal: 127.0.0.1,3260]
Login to [iface: default, target: iqn:lun1, portal:127.0.0.1,3260] successful.

But cannot remove the session afterwards, since the kernel is in an
inconsistent state.

root@debian-vm:~# iscsiadm -m node -T iqn:lun1 -p 127.0.0.1 -u
iscsiadm: No matching sessions found

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
---
drivers/scsi/scsi_transport_iscsi.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index ed8d9709b9b9..2b732b7a9a5b 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2093,7 +2093,12 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
"could not register session's dev\n");
goto release_ida;
}
- transport_register_device(&session->dev);
+ err = transport_register_device(&session->dev);
+ if (err) {
+ iscsi_cls_session_printk(KERN_ERR, session,
+ "could not register transport's dev\n");
+ goto release_dev;
+ }

spin_lock_irqsave(&sesslock, flags);
list_add(&session->sess_list, &sesslist);
@@ -2103,6 +2108,8 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
return 0;

+release_dev:
+ device_del(&session->dev);
release_ida:
if (session->ida_used)
ida_simple_remove(&iscsi_sess_ida, session->target_id);
@@ -2263,7 +2270,12 @@ iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
"register connection's dev\n");
goto release_parent_ref;
}
- transport_register_device(&conn->dev);
+ err = transport_register_device(&conn->dev);
+ if (err) {
+ iscsi_cls_session_printk(KERN_ERR, session, "could not "
+ "register transport's dev\n");
+ goto release_conn_ref;
+ }

spin_lock_irqsave(&connlock, flags);
list_add(&conn->conn_list, &connlist);
@@ -2272,6 +2284,8 @@ iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
return conn;

+release_conn_ref:
+ put_device(&conn->dev);
release_parent_ref:
put_device(&session->dev);
free_conn:
--
2.24.1
\
 
 \ /
  Last update: 2020-01-06 19:59    [W:0.097 / U:2.344 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site