[PATCH] Make grub_efidisk_get_device_name() work on 4K native disks.

[Peter Jones <pjones@redhat.com>]

When we have 4kB sectors instead of 512b sectors, hd.partition_start and
grub_partition_get_start() won't match - the latter assumes 512-byte
sectors, and the former gives us the correct number based on the
physical media's sector size.  So when we have to compare them, we need
to compensate.

Signed-off-by: Peter Jones <pjones@redhat.com>
---
 grub-core/disk/efi/efidisk.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/grub-core/disk/efi/efidisk.c b/grub-core/disk/efi/efidisk.c
index 77ab5b0..a905b52 100644
--- a/grub-core/disk/efi/efidisk.c
+++ b/grub-core/disk/efi/efidisk.c
@@ -791,11 +791,13 @@ grub_efidisk_get_device_name (grub_efi_handle_t *handle)
       auto int find_partition (grub_disk_t disk, const grub_partition_t part);
 
       /* Find the identical partition.  */
-      int find_partition (grub_disk_t disk __attribute__ ((unused)),
-			  const grub_partition_t part)
+      int find_partition (grub_disk_t disk, const grub_partition_t part)
 	{
-	  if (grub_partition_get_start (part) == hd.partition_start
-	      && grub_partition_get_len (part) == hd.partition_size)
+	  struct grub_efidisk_data *d = disk->data;
+	  grub_efi_block_io_media_t *m = d->block_io->media;
+
+	  if (grub_partition_get_start (part) / (m->block_size / 512) == hd.partition_start
+	      && grub_partition_get_len (part) / (m->block_size / 512) == hd.partition_size)
 	    {
 	      partition_name = grub_partition_get_name (part);
 	      return 1;
-- 
1.8.1.4