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

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Date:	Sun, 04 Mar 2012 06:07:20 +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.

OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> writes:

> 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>

Sigh. My ISP's smtp seems to be blocked due to BRBL. Please forward to akpm.

>> 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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