Subject: scsi_dh: Add support for SDEV_PASSIVE
From: Chandra Seetharaman <sekharan@xxxxxxxxxx>
This patch adds a new device state SDEV_PASSIVE, to correspond to the
passive side access of an active/passive multipathed device.
Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
---
---
drivers/scsi/scsi_lib.c | 14 13 + 1 - 0 !
include/scsi/scsi_device.h | 2 2 + 0 - 0 !
2 files changed, 15 insertions(+), 1 deletion(-)
Index: linux-2.6.24-rc8/drivers/scsi/scsi_lib.c
===================================================================
--- linux-2.6.24-rc8.orig/drivers/scsi/scsi_lib.c
+++ linux-2.6.24-rc8/drivers/scsi/scsi_lib.c
@@ -1310,6 +1310,14 @@ int scsi_prep_state_check(struct scsi_de
if (!(req->cmd_flags & REQ_PREEMPT))
ret = BLKPREP_DEFER;
break;
+ case SDEV_PASSIVE:
+ /*
+ * If the device is passive, we refuse to
+ * process any FS commands.
+ */
+ if (req->cmd_type == REQ_TYPE_FS)
+ ret = BLKPREP_KILL;
+ break;
default:
/*
* For any other not fully online state we only allow
@@ -2179,6 +2187,7 @@ scsi_device_set_state(struct scsi_device
case SDEV_OFFLINE:
case SDEV_QUIESCE:
case SDEV_BLOCK:
+ case SDEV_PASSIVE:
break;
default:
goto illegal;
@@ -2241,7 +2250,10 @@ scsi_device_set_state(struct scsi_device
goto illegal;
}
break;
-
+ case SDEV_PASSIVE:
+ if (oldstate != SDEV_RUNNING)
+ goto illegal;
+ break;
}
sdev->sdev_state = state;
return 0;
Index: linux-2.6.24-rc8/include/scsi/scsi_device.h
===================================================================
--- linux-2.6.24-rc8.orig/include/scsi/scsi_device.h
+++ linux-2.6.24-rc8/include/scsi/scsi_device.h
@@ -44,6 +44,8 @@ enum scsi_device_state {
SDEV_BLOCK, /* Device blocked by scsi lld. No scsi
* commands from user or midlayer should be issued
* to the scsi lld. */
+ SDEV_PASSIVE, /* Device is the passive side of a
+ * active/passive multipath storage */
};
enum scsi_device_event {
--
----------------------------------------------------------------------
Chandra Seetharaman | Be careful what you choose....
- sekharan@xxxxxxxxxx | .......you may get it.
----------------------------------------------------------------------
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
