Re: [PATCH] btrfs-progs: Use helper functions to access btrfs_super_block->sys_chunk_array_size

[David Sterba <dsterba@suse.cz>]

On Tue, Nov 29, 2016 at 08:29:02PM +0530, Chandan Rajendra wrote:
> btrfs_super_block->sys_chunk_array_size is stored as le32 data on
> disk. However insert_temp_chunk_item() writes sys_chunk_array_size in
> host cpu order. This commit fixes this by using super block access
> helper functions to read and write
> btrfs_super_block->sys_chunk_array_size field.
> 
> Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
> ---
>  utils.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/utils.c b/utils.c
> index d0189ad..7b17b20 100644
> --- a/utils.c
> +++ b/utils.c
> @@ -562,14 +562,17 @@ static int insert_temp_chunk_item(int fd, struct extent_buffer *buf,
>  	 */
>  	if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
>  		char *cur;
> +		u32 array_size;
>  
>  		cur = (char *)sb->sys_chunk_array + sb->sys_chunk_array_size;

This should also use the accessor, 'sb' is directly mapped to the buffer
read from disk.

>  		memcpy(cur, &disk_key, sizeof(disk_key));
>  		cur += sizeof(disk_key);
>  		read_extent_buffer(buf, cur, (unsigned long int)chunk,
>  				   btrfs_chunk_item_size(1));
> -		sb->sys_chunk_array_size += btrfs_chunk_item_size(1) +
> +		array_size = btrfs_super_sys_array_size(sb);
> +		array_size += btrfs_chunk_item_size(1) +
>  					    sizeof(disk_key);
> +		btrfs_set_super_sys_array_size(sb, array_size);
>  
>  		ret = write_temp_super(fd, sb, cfg->super_bytenr);
>  	}
> -- 
> 2.5.5
> 
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