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>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 1e5d0a36a0a43017fad538774326496952519011..ddf8e48627878999c17f686fcfb05dce669a2b9c 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6668,6 +6668,7 @@ EXPORT_SYMBOL_GPL(ata_dummy_port_info);
 EXPORT_SYMBOL_GPL(ata_link_next);
 EXPORT_SYMBOL_GPL(ata_dev_next);
 EXPORT_SYMBOL_GPL(ata_std_bios_param);
+EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
 EXPORT_SYMBOL_GPL(ata_host_init);
 EXPORT_SYMBOL_GPL(ata_host_alloc);
 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index cfa9dd3d72530b8beabbaf272498ba843cb6e499..a54273d2c3c6a9f432ae60d49496335452ecc1d6 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -414,6 +414,35 @@ int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
        return 0;
 }
 
+/**
+ *     ata_scsi_unlock_native_capacity - unlock native capacity
+ *     @sdev: SCSI device to adjust device capacity for
+ *
+ *     This function is called if a partition on @sdev extends beyond
+ *     the end of the device.  It requests EH to unlock HPA.
+ *
+ *     LOCKING:
+ *     Defined by the SCSI layer.  Might sleep.
+ */
+void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
+{
+       struct ata_port *ap = ata_shost_to_port(sdev->host);
+       struct ata_device *dev;
+       unsigned long flags;
+
+       spin_lock_irqsave(ap->lock, flags);
+
+       dev = ata_scsi_find_dev(ap, sdev);
+       if (dev && dev->n_sectors < dev->n_native_sectors) {
+               dev->flags |= ATA_DFLAG_UNLOCK_HPA;
+               dev->link->eh_info.action |= ATA_EH_RESET;
+               ata_port_schedule_eh(ap);
+       }
+
+       spin_unlock_irqrestore(ap->lock, flags);
+       ata_port_wait_eh(ap);
+}
+
 /**
  *     ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
  *     @ap: target port

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 3bad2701bfa6349ff9ff8e0314f2b6cb3985e1f2..b85f3ff34d7d3d71cb99f0ded4db0ce186780b57 100644 (file)
--- 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)                                  \