[PATCH 6/8] SCSI: implement sd_unlock_native_capacity()

[Tejun Heo]

Implement sd_unlock_native_capacity() method which calls into
hostt->unlock_native_capacity() if implemented.  This will be invoked
by block layer if partitions extend beyond the end of the device and
can be used to implement, for example, on-demand ATA host protected
area unlocking.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/scsi/sd.c        |   22 ++++++++++++++++++++++
 include/scsi/scsi_host.h |    8 ++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 8b827f3..b85906e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -97,6 +97,7 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
 #endif
 
 static int  sd_revalidate_disk(struct gendisk *);
+static void sd_unlock_native_capacity(struct gendisk *disk);
 static int  sd_probe(struct device *);
 static int  sd_remove(struct device *);
 static void sd_shutdown(struct device *);
@@ -1100,6 +1101,7 @@ static const struct block_device_operations sd_fops = {
 #endif
 	.media_changed		= sd_media_changed,
 	.revalidate_disk	= sd_revalidate_disk,
+	.unlock_native_capacity	= sd_unlock_native_capacity,
 };
 
 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
@@ -2101,6 +2103,26 @@ static int sd_revalidate_disk(struct gendisk *disk)
 }
 
 /**
+ *	sd_unlock_native_capacity - unlock native capacity
+ *	@disk: struct gendisk to set capacity for
+ *
+ *	Block layer calls this function if it detects that partitions
+ *	on @disk reach beyond the end of the device.  If the SCSI host
+ *	implements ->unlock_native_capacity() method, it's invoked to
+ *	give it a chance to adjust the device capacity.
+ *
+ *	CONTEXT:
+ *	Defined by block layer.  Might sleep.
+ */
+static void sd_unlock_native_capacity(struct gendisk *disk)
+{
+	struct scsi_device *sdev = scsi_disk(disk)->device;
+
+	if (sdev->host->hostt->unlock_native_capacity)
+		sdev->host->hostt->unlock_native_capacity(sdev);
+}
+
+/**
  *	sd_format_disk_name - format disk name
  *	@prefix: name prefix - ie. "sd" for SCSI disks
  *	@index: index of the disk to format name for
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index c50a97f..b7bdecb 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -327,6 +327,14 @@ struct scsi_host_template {
 			sector_t, int []);
 
 	/*
+	 * This function is called when one or more partitions on the
+	 * device reach beyond the end of the device.
+	 *
+	 * Status: OPTIONAL
+	 */
+	void (*unlock_native_capacity)(struct scsi_device *);
+
+	/*
 	 * Can be used to export driver statistics and other infos to the
 	 * world outside the kernel ie. userspace and it also provides an
 	 * interface to feed the driver with information.
-- 
1.6.4.2

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