linux-kernel - Re: [PATCH 1/2] fat: Clean up xlate_to

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Date:	Sun, 04 Mar 2012 05:58:39 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ravishankar N <cyberax82@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] fat: Clean up xlate_to_uni.

Namjae Jeon <linkinjeon@...il.com> writes:

>  The xlate_to_uni is called by vfat_build_slots with sbi->nls_io as the final
>  argument. nls_io can never be null at this point because the check is already being done in fat_fill_super wherein the mount fails if it is null.

Looks good to me. And now, I don't have public repo after kernel.org
break in. It would be better to pass akpm.

Acked-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>

> Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
> Signed-off-by: Ravishankar N <cyberax82@...il.com>
> ---
>  fs/fat/namei_vfat.c |   83 ++++++++++++++++++++++-----------------------------
>  1 files changed, 36 insertions(+), 47 deletions(-)
>
> diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
> index a81eb23..aae3b4e 100644
> --- a/fs/fat/namei_vfat.c
> +++ b/fs/fat/namei_vfat.c
> @@ -521,57 +521,46 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
>  
>  		op = &outname[*outlen * sizeof(wchar_t)];
>  	} else {
> -		if (nls) {
> -			for (i = 0, ip = name, op = outname, *outlen = 0;
> -			     i < len && *outlen <= FAT_LFN_LEN;
> -			     *outlen += 1)
> -			{
> -				if (escape && (*ip == ':')) {
> -					if (i > len - 5)
> -						return -EINVAL;
> -					ec = 0;
> -					for (k = 1; k < 5; k++) {
> -						nc = ip[k];
> -						ec <<= 4;
> -						if (nc >= '0' && nc <= '9') {
> -							ec |= nc - '0';
> -							continue;
> -						}
> -						if (nc >= 'a' && nc <= 'f') {
> -							ec |= nc - ('a' - 10);
> -							continue;
> -						}
> -						if (nc >= 'A' && nc <= 'F') {
> -							ec |= nc - ('A' - 10);
> -							continue;
> -						}
> -						return -EINVAL;
> +		for (i = 0, ip = name, op = outname, *outlen = 0;
> +			 i < len && *outlen <= FAT_LFN_LEN;
> +			 *outlen += 1) {
> +			if (escape && (*ip == ':')) {
> +				if (i > len - 5)
> +					return -EINVAL;
> +				ec = 0;
> +				for (k = 1; k < 5; k++) {
> +					nc = ip[k];
> +					ec <<= 4;
> +					if (nc >= '0' && nc <= '9') {
> +						ec |= nc - '0';
> +						continue;
>  					}
> -					*op++ = ec & 0xFF;
> -					*op++ = ec >> 8;
> -					ip += 5;
> -					i += 5;
> -				} else {
> -					if ((charlen = nls->char2uni(ip, len - i, (wchar_t *)op)) < 0)
> -						return -EINVAL;
> -					ip += charlen;
> -					i += charlen;
> -					op += 2;
> +					if (nc >= 'a' && nc <= 'f') {
> +						ec |= nc - ('a' - 10);
> +						continue;
> +					}
> +					if (nc >= 'A' && nc <= 'F') {
> +						ec |= nc - ('A' - 10);
> +						continue;
> +					}
> +					return -EINVAL;
>  				}
> +				*op++ = ec & 0xFF;
> +				*op++ = ec >> 8;
> +				ip += 5;
> +				i += 5;
> +			} else {
> +				charlen = nls->char2uni(ip, len - i,
> +									(wchar_t *)op);
> +				if (charlen < 0)
> +					return -EINVAL;
> +				ip += charlen;
> +				i += charlen;
> +				op += 2;
>  			}
> -			if (i < len)
> -				return -ENAMETOOLONG;
> -		} else {
> -			for (i = 0, ip = name, op = outname, *outlen = 0;
> -			     i < len && *outlen <= FAT_LFN_LEN;
> -			     i++, *outlen += 1)
> -			{
> -				*op++ = *ip++;
> -				*op++ = 0;
> -			}
> -			if (i < len)
> -				return -ENAMETOOLONG;
>  		}
> +		if (i < len)
> +			return -ENAMETOOLONG;
>  	}
>  
>  	*longlen = *outlen;

-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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