linux-kernel - Re: [PATCH v4] lib: add size unit t/p/e to memparse

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Date:	Fri, 13 Jun 2014 07:55:55 +0200
From:	Brendan Hide <brendan@...ftspirit.co.za>
To:	Gui Hecheng <guihc.fnst@...fujitsu.com>,
	linux-kernel@...r.kernel.org
CC:	linux-btrfs@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v4] lib: add size unit t/p/e to memparse

On 13/06/14 03:42, Gui Hecheng wrote:
> For modern filesystems such as btrfs, t/p/e size level operations
> are common.
> add size unit t/p/e parsing to memparse
>
> Signed-off-by: Gui Hecheng <guihc.fnst@...fujitsu.com>
> ---
> changelog
> 	v1->v2: replace kilobyte with kibibyte, and others
> 	v2->v3: add missing unit "bytes" in comment
> 	v3->v4: remove idiotic name for K,M,G,P,T,E
> ---
>   lib/cmdline.c | 15 ++++++++++-----
>   1 file changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/lib/cmdline.c b/lib/cmdline.c
> index d4932f7..76a712e 100644
> --- a/lib/cmdline.c
> +++ b/lib/cmdline.c
> @@ -121,11 +121,7 @@ EXPORT_SYMBOL(get_options);
>    *	@retptr: (output) Optional pointer to next char after parse completes
>    *
>    *	Parses a string into a number.  The number stored at @ptr is
> - *	potentially suffixed with %K (for kilobytes, or 1024 bytes),
> - *	%M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or
> - *	1073741824).  If the number is suffixed with K, M, or G, then
> - *	the return value is the number multiplied by one kilobyte, one
> - *	megabyte, or one gigabyte, respectively.
> + *	potentially suffixed with K, M, G, T, P, E.
>    */
>   
>   unsigned long long memparse(const char *ptr, char **retptr)
> @@ -135,6 +131,15 @@ unsigned long long memparse(const char *ptr, char **retptr)
>   	unsigned long long ret = simple_strtoull(ptr, &endptr, 0);
>   
>   	switch (*endptr) {
> +	case 'E':
> +	case 'e':
> +		ret <<= 10;
> +	case 'P':
> +	case 'p':
> +		ret <<= 10;
> +	case 'T':
> +	case 't':
> +		ret <<= 10;
>   	case 'G':
>   	case 'g':
>   		ret <<= 10;
Ah, I see - you've removed all reference to their names. That's good too. :)

-- 
__________
Brendan Hide
http://swiftspirit.co.za/
http://www.webafrica.co.za/?AFF1E97

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