[SCSI] Add 'eh_deadline' to limit SCSI EH runtime
This patchs adds an 'eh_deadline' sysfs attribute to the scsi
host which limits the overall runtime of the SCSI EH.
The 'eh_deadline' value is stored in the now obsolete field
'resetting'.
When a command is failed the start time of the EH is stored
in 'last_reset'. If the overall runtime of the SCSI EH is longer
than last_reset + eh_deadline, the EH is short-circuited and
falls through to issue a host reset only.
[jejb: add comments in Scsi_Host about new fields]
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index a74b7d9..5460849 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -599,6 +599,11 @@
unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */
+ /* next two fields are used to bound the time spent in error handling */
+ int eh_deadline;
+ unsigned long last_reset;
+
+
/*
* These three parameters can be used to allow for wide scsi,
* and for host adapters that support multiple busses
