[SCSI] add new SDEV_TRANSPORT_OFFLINE state
This patch adds a new state SDEV_TRANSPORT_OFFLINE. It will
be used by transport classes to offline devices for cases like
when the fast_io_fail/recovery_tmo fires. In those cases we
want all IO to fail, and we have not yet escalated to dev_loss_tmo
behavior where we are removing the devices.
Currently to handle this state, transport classes are setting
the scsi_device's state to running, setting their internal
session/port structs state to something that indicates failed,
and then failing IO from some transport check in the queuecommand.
The reason for the new value is so that users can distinguish
between a device failure that is a result of a transport problem
vs the wide range of errors that devices get offlined for
when a scsi command times out and we offline the devices there.
It also fixes the confusion as to why the transport class is
failing IO, but has set the device state from blocked to running.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 6dfb978..340c569 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1173,6 +1173,7 @@
if (unlikely(sdev->sdev_state != SDEV_RUNNING)) {
switch (sdev->sdev_state) {
case SDEV_OFFLINE:
+ case SDEV_TRANSPORT_OFFLINE:
/*
* If the device is offline we refuse to process any
* commands. The device must be brought online
@@ -2081,6 +2082,7 @@
switch (oldstate) {
case SDEV_CREATED:
case SDEV_OFFLINE:
+ case SDEV_TRANSPORT_OFFLINE:
case SDEV_QUIESCE:
case SDEV_BLOCK:
break;
@@ -2093,6 +2095,7 @@
switch (oldstate) {
case SDEV_RUNNING:
case SDEV_OFFLINE:
+ case SDEV_TRANSPORT_OFFLINE:
break;
default:
goto illegal;
@@ -2100,6 +2103,7 @@
break;
case SDEV_OFFLINE:
+ case SDEV_TRANSPORT_OFFLINE:
switch (oldstate) {
case SDEV_CREATED:
case SDEV_RUNNING:
@@ -2136,6 +2140,7 @@
case SDEV_RUNNING:
case SDEV_QUIESCE:
case SDEV_OFFLINE:
+ case SDEV_TRANSPORT_OFFLINE:
case SDEV_BLOCK:
break;
default:
@@ -2148,6 +2153,7 @@
case SDEV_CREATED:
case SDEV_RUNNING:
case SDEV_OFFLINE:
+ case SDEV_TRANSPORT_OFFLINE:
case SDEV_CANCEL:
break;
default:
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 04c2a27..5747478 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -35,6 +35,7 @@
{ SDEV_DEL, "deleted" },
{ SDEV_QUIESCE, "quiesce" },
{ SDEV_OFFLINE, "offline" },
+ { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
{ SDEV_BLOCK, "blocked" },
{ SDEV_CREATED_BLOCK, "created-blocked" },
};