# Re: \[PATCH\] Always return last partition end address in 512B blocks

- From: Jes Sorensen \<hidden\>
- Date: 2016-12-12 19:30:28 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2016/12/6633924
- Thread: https://ratatoskr.run/linux-raid/2016/12/6633924/t.md

```text
Mariusz Dabrowski [ref] writes:
> For 4K disks 'endofpart' is an index of the last 4K sector used by partition.
> mdadm is using number of 512-byte sectors, so value returned by
> get_last_partition_end must be multiplied by 8 for devices with 4K sectors.
> Also, unused 'ret' variable has been removed.
>
> Signed-off-by: Mariusz Dabrowski <redacted>
> ---
>  util.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

I am a little wary of this since I don't have any 4k sector drivers to
test with, so I will come yelling at you if this breaks something :)

> diff --git a/util.c b/util.c
> index 883eaa4..46c1280 100644
> --- a/util.c
> +++ b/util.c
> @@ -1430,6 +1430,7 @@ static int get_last_partition_end(int fd, unsigned long long *endofpart)
>  	struct MBR boot_sect;
>  	unsigned long long curr_part_end;
>  	unsigned part_nr;
> +	unsigned int sector_size;
>  	int retval = 0;
>  
>  	*endofpart = 0;
> @@ -1469,6 +1470,9 @@ static int get_last_partition_end(int fd, unsigned long long *endofpart)
>  		/* Unknown partition table */
>  		retval = -1;
>  	}
> +	/* calculate number of 512-byte blocks */
> +	if (get_dev_sector_size(fd, NULL, &sector_size))
> +		*endofpart *= sector_size/512;

I really would prefer to see a parenthesis around this here and use of
proper spacing.

Thanks,
Jes
```