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authorTejun Heo <tj@kernel.org>2010-05-15 20:09:32 +0200
committerJeff Garzik <jgarzik@redhat.com>2010-06-02 13:50:04 -0400
commit72ec24bd7725545bc149d80cbd21a7578d9aa206 (patch)
treea67f8fdda3b0dd69bb45ca19508b68431f1b69d8 /drivers/scsi
parented4e2f801cf1484a68c4b41878353f26e6554c6a (diff)
downloadlinux-2.6.34-ux500-72ec24bd7725545bc149d80cbd21a7578d9aa206.tar.gz
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>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/sd.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 829cc37abc4..8802e48bc06 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 *);
@@ -1101,6 +1102,7 @@ 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)
@@ -2121,6 +2123,26 @@ 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