linux-ext4 - Re: [PATCH 3/5] libe2p: teach parse_num_blocks2() to return bytes if log_block

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Date:	Tue, 15 Jan 2013 23:23:37 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 3/5] libe2p: teach parse_num_blocks2() to return bytes if
 log_block_size < 0

On Mon, Jan 14, 2013 at 07:37:10PM -0500, Theodore Ts'o wrote:
> Previously the behavior of parse_num_block2 was undefined if
> log_block_size was less than zero.  It will now return a number in
> units of bytes.
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Reviewed-by: Zheng Liu <wenqing.lz@...bao.com>
Regards,
                                                - Zheng
> ---
>  lib/e2p/parse_num.c | 24 ++++++++++++++++++++----
>  1 file changed, 20 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/e2p/parse_num.c b/lib/e2p/parse_num.c
> index d9ad3e7..cb0dc5b 100644
> --- a/lib/e2p/parse_num.c
> +++ b/lib/e2p/parse_num.c
> @@ -35,10 +35,16 @@ unsigned long long parse_num_blocks2(const char *arg, int log_block_size)
>  		num <<= 10;
>  		/* fallthrough */
>  	case 'K': case 'k':
> -		num >>= log_block_size;
> +		if (log_block_size < 0)
> +			num <<= 10;
> +		else
> +			num >>= log_block_size;
>  		break;
>  	case 's':
> -		num >>= (1+log_block_size);
> +		if (log_block_size < 0)
> +			num << 1;
> +		else
> +			num >>= (1+log_block_size);
>  		break;
>  	case '\0':
>  		break;
> @@ -62,11 +68,21 @@ main(int argc, char **argv)
>  	unsigned long num;
>  	int log_block_size = 0;
>  
> -	if (argc != 2) {
> -		fprintf(stderr, "Usage: %s arg\n", argv[0]);
> +	if (argc != 2 && argc != 3) {
> +		fprintf(stderr, "Usage: %s arg [log_block_size]\n", argv[0]);
>  		exit(1);
>  	}
>  
> +	if (argc == 3) {
> +		char *p;
> +
> +		log_block_size = strtol(argv[2], &p, 0);
> +		if (*p) {
> +			fprintf(stderr, "Bad log_block_size: %s\n", argv[2]);
> +			exit(1);
> +		}
> +	}
> +
>  	num = parse_num_blocks(argv[1], log_block_size);
>  
>  	printf("Parsed number: %lu\n", num);
> -- 
> 1.7.12.rc0.22.gcdd159b
> 
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