SCSI: implement sd_unlock_native_capacity()
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@kernel.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 829cc37..8802e48 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -97,6 +97,7 @@
#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 *);
@@ -1101,6 +1102,7 @@
#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)
@@ -2121,6 +2123,26 @@
}
/**
+ * 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 @@
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.