linux-kernel - Re: [PATCH v9 10/13] exfat: add nls operations

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Date:   Fri, 3 Jan 2020 09:44:04 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Namjae Jeon <namjae.jeon@...sung.com>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        gregkh@...uxfoundation.org, valdis.kletnieks@...edu, hch@....de,
        sj1557.seo@...sung.com, linkinjeon@...il.com
Subject: Re: [PATCH v9 10/13] exfat: add nls operations

On Friday 03 January 2020 16:06:25 Namjae Jeon wrote:
> > On Thursday 02 January 2020 16:20:33 Namjae Jeon wrote:
> > > This adds the implementation of nls operations for exfat.
> > >
> > > Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> > > Signed-off-by: Sungjong Seo <sj1557.seo@...sung.com>
> > > ---
> > >  fs/exfat/nls.c | 809
> > > +++++++++++++++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 809 insertions(+)
> > >  create mode 100644 fs/exfat/nls.c
> > >
> > > diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c new file mode 100644
> > > index 000000000000..af52328e28ff
> > > --- /dev/null
> > > +++ b/fs/exfat/nls.c
> > 
> > ...
> > 
> > > +int exfat_nls_uni16s_to_vfsname(struct super_block *sb,
> > > +		struct exfat_uni_name *uniname, unsigned char *p_cstring,
> > > +		int buflen)
> > > +{
> > > +	if (EXFAT_SB(sb)->options.utf8)
> > > +		return __exfat_nls_utf16s_to_vfsname(sb, uniname, p_cstring,
> > > +				buflen);
> > > +	return __exfat_nls_uni16s_to_vfsname(sb, uniname, p_cstring,
> > buflen);
> > > +}
> > 
> > Hello, I'm looking at this function and basically it do nothing.
> > Or was it supposed that this function should do something more for UTF-8
> > encoding?
> > 
> > There is one if- statement, but in both branches is executed exactly
> > same code.
> > 
> > And executed function just pass same arguments as current callee
> > function.
> > 
> > So calls to exfat_nls_uni16s_to_vfsname() can be replaced by direct
> > calls to __exfat_nls_uni16s_to_vfsname().
> Ah, The function names are similar, but not same. see utf16s/uni16s.
> 
> Thanks!

Ou, sorry for that :-(

I will look again and more deeply at this encoding code as I think there
can be some problem with processing utf-16 buffers...

> > 
> > Or maybe better, rename __exfat_nls_uni16s_to_vfsname() function to
> > exfat_nls_uni16s_to_vfsname().
> > 
> > > +int exfat_nls_vfsname_to_uni16s(struct super_block *sb,
> > > +		const unsigned char *p_cstring, const int len,
> > > +		struct exfat_uni_name *uniname, int *p_lossy)
> > > +{
> > > +	if (EXFAT_SB(sb)->options.utf8)
> > > +		return __exfat_nls_vfsname_to_utf16s(sb, p_cstring, len,
> > > +				uniname, p_lossy);
> > > +	return __exfat_nls_vfsname_to_uni16s(sb, p_cstring, len, uniname,
> > > +			p_lossy);
> > > +}
> > 
> > And same for this function.
> > 
> > --
> > Pali Rohár
> > pali.rohar@...il.com
> 
> 

-- 
Pali Rohár
pali.rohar@...il.com