ide: keep track of number of bytes instead of sectors in struct ide_cmd

* Pass number of bytes instead of sectors to ide_init_sg_cmd().

* Pass number of bytes to process to ide_pio_sector() and rename
  it to ide_pio_bytes().

* Rename ->nsect field to ->nbytes in struct ide_cmd and use
  ->nbytes, ->nleft and ->cursg_ofs to keep track of number of
  bytes instead of sectors.

There should be no functional changes caused by this patch.

Acked-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 2d0c7af..d5d8322 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -350,7 +350,7 @@
 	int			orig_sg_nents;
 	int			sg_dma_direction; /* DMA transfer direction */
 
-	unsigned int		nsect;
+	unsigned int		nbytes;
 	unsigned int		nleft;
 	struct scatterlist	*cursg;
 	unsigned int		cursg_ofs;
@@ -1409,7 +1409,7 @@
 #endif
 
 void ide_map_sg(ide_drive_t *, struct ide_cmd *);
-void ide_init_sg_cmd(struct ide_cmd *, int);
+void ide_init_sg_cmd(struct ide_cmd *, unsigned int);
 
 #define BAD_DMA_DRIVE		0
 #define GOOD_DMA_DRIVE		1