ide-gd: implement block device ->set_capacity method (v2)

* Use ->probed_capacity to store native device capacity for ATA disks.

* Add ->set_capacity method to struct ide_disk_ops.

* Implement disk device ->set_capacity method for ATA disks.

* Implement block device ->set_capacity method.

v2:
* Check if LBA and HPA are supported in ide_disk_set_capacity().

* According to the spec the SET MAX ADDRESS command shall be
  immediately preceded by a READ NATIVE MAX ADDRESS command.

* Add ide_disk_hpa_{get_native,set}_capacity() helpers.

Together with the previous patch adding ->set_capacity block device
method this allows automatic disabling of Host Protected Area (HPA)
if any partitions overlapping HPA are detected.

Cc: Robert Hancock <hancockrwd@gmail.com>
Cc: Frans Pop <elendil@planet.nl>
Cc: "Andries E. Brouwer" <Andries.Brouwer@cwi.nl>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Emphatically-Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 9fed365a598b..e96ace12872a 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -397,6 +397,7 @@ struct ide_drive_s;
 struct ide_disk_ops {
         int             (*check)(struct ide_drive_s *, const char *);
         int             (*get_capacity)(struct ide_drive_s *);
+        u64             (*set_capacity)(struct ide_drive_s *, u64);
         void            (*setup)(struct ide_drive_s *);
         void            (*flush)(struct ide_drive_s *);
         int             (*init_media)(struct ide_drive_s *, struct gendisk *);
@@ -568,8 +569,7 @@ struct ide_drive_s {
         unsigned int    drive_data;     /* used by set_pio_mode/dev_select() */
         unsigned int    failures;       /* current failure count */
         unsigned int    max_failures;   /* maximum allowed failure count */
-        u64             probed_capacity;/* initial reported media capacity (ide-cd only currently) */
-
+        u64             probed_capacity;/* initial/native media capacity */
         u64             capacity64;     /* total number of sectors */
 
         int             lun;            /* logical unit */