libata: implement on-demand HPA unlocking

Implement ata_scsi_unlock_native_capacity() which will be called
through SCSI layer when block layer notices that partitions on a
device extend beyond the end of the device.  It requests EH to unlock
HPA, waits for completion and returns the current device capacity.

This allows libata to unlock HPA on demand instead of having to decide
whether to unlock upfront.  Unlocking on demand is safer than
unlocking by upfront because some BIOSes write private data to the
area beyond HPA limit.  This was suggested by Ben Hutchings.

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 3bad2701bfa6..b85f3ff34d7d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1023,6 +1023,7 @@ extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
 extern int ata_std_bios_param(struct scsi_device *sdev,
                               struct block_device *bdev,
                               sector_t capacity, int geom[]);
+extern void ata_scsi_unlock_native_capacity(struct scsi_device *sdev);
 extern int ata_scsi_slave_config(struct scsi_device *sdev);
 extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
 extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
@@ -1174,6 +1175,7 @@ extern struct device_attribute *ata_common_sdev_attrs[];
         .slave_configure        = ata_scsi_slave_config,        \
         .slave_destroy          = ata_scsi_slave_destroy,       \
         .bios_param             = ata_std_bios_param,           \
+        .unlock_native_capacity = ata_scsi_unlock_native_capacity, \
         .sdev_attrs             = ata_common_sdev_attrs
 
 #define ATA_NCQ_SHT(drv_name)                                   \