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scsi: iscsi: Fix offload conn cleanup when iscsid restarts

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[ Upstream commit cbd2283aaf ]

When userspace restarts during boot or upgrades it won't know about the
offload driver's endpoint and connection mappings. iscsid will start by
cleaning up the old session by doing a stop_conn call. Later, if we are
able to create a new connection, we clean up the old endpoint during the
binding stage. The problem is that if we do stop_conn before doing the
ep_disconnect call offload, drivers can still be executing I/O. We then
might free tasks from the under the card/driver.

This moves the ep_disconnect call to before we do the stop_conn call for
this case. It will then work and look like a normal recovery/cleanup
procedure from the driver's point of view.

Link: https://lore.kernel.org/r/20220408001314.5014-3-michael.christie@oracle.com
Tested-by: Manish Rangankar <mrangankar@marvell.com>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mike Christie 2022-04-07 19:13:06 -05:00 committed by Greg Kroah-Hartman
parent 36b2a79026
commit c265ff1885
1 changed files with 28 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

48
drivers/scsi/scsi_transport_iscsi.c
View file

@ -2255,6 +2255,23 @@ static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
}
static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
struct iscsi_endpoint *ep,
bool is_active)
{
/* Check if this was a conn error and the kernel took ownership */
if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
iscsi_ep_disconnect(conn, is_active);
} else {
ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
mutex_unlock(&conn->ep_mutex);
flush_work(&conn->cleanup_work);
mutex_lock(&conn->ep_mutex);
}
}
static int iscsi_if_stop_conn(struct iscsi_transport *transport,
struct iscsi_uevent *ev)
{
@ -2275,6 +2292,16 @@ static int iscsi_if_stop_conn(struct iscsi_transport *transport,
cancel_work_sync(&conn->cleanup_work);
iscsi_stop_conn(conn, flag);
} else {
/*
* For offload, when iscsid is restarted it won't know about
* existing endpoints so it can't do a ep_disconnect. We clean
* it up here for userspace.
*/
mutex_lock(&conn->ep_mutex);
if (conn->ep)
iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
mutex_unlock(&conn->ep_mutex);
/*
* Figure out if it was the kernel or userspace initiating this.
*/
@ -3003,16 +3030,7 @@ static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
}
mutex_lock(&conn->ep_mutex);
/* Check if this was a conn error and the kernel took ownership */
if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
mutex_unlock(&conn->ep_mutex);
flush_work(&conn->cleanup_work);
goto put_ep;
}
iscsi_ep_disconnect(conn, false);
iscsi_if_disconnect_bound_ep(conn, ep, false);
mutex_unlock(&conn->ep_mutex);
put_ep:
iscsi_put_endpoint(ep);
@ -3723,16 +3741,6 @@ static int iscsi_if_transport_conn(struct iscsi_transport *transport,
switch (nlh->nlmsg_type) {
case ISCSI_UEVENT_BIND_CONN:
if (conn->ep) {
/*
* For offload boot support where iscsid is restarted
* during the pivot root stage, the ep will be intact
* here when the new iscsid instance starts up and
* reconnects.
*/
iscsi_ep_disconnect(conn, true);
}
session = iscsi_session_lookup(ev->u.b_conn.sid);
if (!session) {
err = -EINVAL;