[PATCH 18/21] scsi: propagate the swapdev hook into the scsi stack

[Peter Zijlstra]

Allow scsi devices to receive the swapdev notification.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
CC: James E.J. Bottomley <James.Bottomley@xxxxxxxxxxxx>
CC: Mike Christie <michaelc@xxxxxxxxxxx>
---
 drivers/scsi/sd.c        |   13 +++++++++++++
 include/scsi/scsi_host.h |    7 +++++++
 2 files changed, 20 insertions(+)

Index: linux-2.6/drivers/scsi/sd.c
===================================================================
--- linux-2.6.orig/drivers/scsi/sd.c
+++ linux-2.6/drivers/scsi/sd.c
@@ -892,6 +892,18 @@ static long sd_compat_ioctl(struct file 
 }
 #endif
 
+static int sd_swapdev(struct gendisk *disk, int enable)
+{
+	int error = 0;
+	struct scsi_disk *sdkp = scsi_disk(disk);
+	struct scsi_device *sdp = sdkp->device;
+
+	if (sdp->host->hostt->swapdev)
+		error = sdp->host->hostt->swapdev(sdp, enable);
+
+	return error;
+}
+
 static struct block_device_operations sd_fops = {
 	.owner			= THIS_MODULE,
 	.open			= sd_open,
@@ -903,6 +915,7 @@ static struct block_device_operations sd
 #endif
 	.media_changed		= sd_media_changed,
 	.revalidate_disk	= sd_revalidate_disk,
+	.swapdev		= sd_swapdev,
 };
 
 /**
Index: linux-2.6/include/scsi/scsi_host.h
===================================================================
--- linux-2.6.orig/include/scsi/scsi_host.h
+++ linux-2.6/include/scsi/scsi_host.h
@@ -288,6 +288,13 @@ struct scsi_host_template {
 	int (*suspend)(struct scsi_device *, pm_message_t state);
 
 	/*
+	 * Notify that this device is used for swapping.
+	 *
+	 * Status: OPTIONAL
+	 */
+	int (*swapdev)(struct scsi_device *, int enable);
+
+	/*
 	 * Name of proc directory
 	 */
 	char *proc_name;

--
-
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