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authorMike Christie <michaelc@cs.wisc.edu>2012-05-17 23:56:56 -0500
committerJames Bottomley <JBottomley@Parallels.com>2012-07-20 08:58:21 +0100
commit1b8d26206134458044b0689f48194af00c96d406 (patch)
tree767d6fa1ed7cb5385daecac13b4fbf2fdc8267c0 /include/scsi
parent87098bdd100497ceac0797c6b2f4c51eea1f1e42 (diff)
downloadlinux-linaro-stable-1b8d26206134458044b0689f48194af00c96d406.tar.gz
[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>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/scsi_device.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index ba9698852321..404575857962 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -42,6 +42,7 @@ enum scsi_device_state {
* originate in the mid-layer) */
SDEV_OFFLINE, /* Device offlined (by error handling or
* user request */
+ SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
SDEV_BLOCK, /* Device blocked by scsi lld. No
* scsi commands from user or midlayer
* should be issued to the scsi
@@ -421,6 +422,7 @@ static inline unsigned int sdev_id(struct scsi_device *sdev)
static inline int scsi_device_online(struct scsi_device *sdev)
{
return (sdev->sdev_state != SDEV_OFFLINE &&
+ sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
sdev->sdev_state != SDEV_DEL);
}
static inline int scsi_device_blocked(struct scsi_device *sdev)