[SCSI] aacraid: expanded expose physical device code (new)

Received from Mark Salyzyn,

Take the expose_physicals flag and allow the user to select default (physicals
available via /dev/sg), exposed (physicals available via /dev/sd for
experimental reasons) and hidden (physicals blocked from all access). This
expands the functionality of the previous expose_physicals insmod parameter
which was added to support some experimental configurations.

Signed-off-by Mark Haverkamp <markh@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/aacraid/aachba.c

@@ -170,9 +170,9 @@ int acbsize = -1;
 module_param(acbsize, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(acbsize, "Request a specific adapter control block (FIB) size. Valid values are 512, 2048, 4096 and 8192. Default is to use suggestion from Firmware.");
 
-int expose_physicals = 0;
+int expose_physicals = -1;
 module_param(expose_physicals, int, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(expose_physicals, "Expose physical components of the arrays. 0=off, 1=on");
+MODULE_PARM_DESC(expose_physicals, "Expose physical components of the arrays. -1=protect 0=off, 1=on");
 /**
  *	aac_get_config_status	-	check the adapter configuration
  *	@common: adapter to query

drivers/scsi/aacraid/linit.c

@@ -398,11 +398,15 @@ static int aac_slave_configure(struct scsi_device *sdev)
 		sdev->skip_ms_page_3f = 1;
 	}
 	if ((sdev->type == TYPE_DISK) &&
-			!expose_physicals &&
 			(sdev_channel(sdev) != CONTAINER_CHANNEL)) {
-		struct aac_dev *aac = (struct aac_dev *)sdev->host->hostdata;
-		if (!aac->raid_scsi_mode || (sdev_channel(sdev) != 2))
-			sdev->no_uld_attach = 1;
+		if (expose_physicals == 0)
+			return -ENXIO;
+		if (expose_physicals < 0) {
+			struct aac_dev *aac =
+				(struct aac_dev *)sdev->host->hostdata;
+			if (!aac->raid_scsi_mode || (sdev_channel(sdev) != 2))
+				sdev->no_uld_attach = 1;
+		}
 	}
 	if (sdev->tagged_supported && (sdev->type == TYPE_DISK) &&
 			(sdev_channel(sdev) == CONTAINER_CHANNEL)) {