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From:   David Laight <David.Laight@ACULAB.COM>
To:     'Jaegeuk Kim' <jaegeuk@kernel.org>,
        Eric Biggers <ebiggers@kernel.org>
CC:     Daniel Rosenberg <drosen@google.com>, Chao Yu <chao@kernel.org>,
        "linux-f2fs-devel@lists.sourceforge.net" 
        <linux-f2fs-devel@lists.sourceforge.net>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        Gabriel Krisman Bertazi <krisman@collabora.com>,
        "kernel-team@android.com" <kernel-team@android.com>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: RE: [PATCH v2 2/2] f2fs: Advertise encrypted casefolding in sysfs
Thread-Topic: [PATCH v2 2/2] f2fs: Advertise encrypted casefolding in sysfs
Thread-Index: AQHXWPxv6htlFlDG3kih+WsZuRk5JqsDg75Q
Date:   Fri, 4 Jun 2021 08:27:32 +0000
Message-ID: <4f56f2781fac4b8bac1a78b0fecc318d@AcuMS.aculab.com>
References: <20210603095038.314949-1-drosen@google.com>
 <20210603095038.314949-3-drosen@google.com>
 <YLlj+h4RiT6FvyK6@sol.localdomain> <YLmv5Ykb3QUzDOlL@google.com>
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From: Jaegeuk Kim
> Sent: 04 June 2021 05:45
...
> > > @@ -161,6 +161,9 @@ static ssize_t features_show(struct f2fs_attr *a,
> > >  	if (f2fs_sb_has_compression(sbi))
> > >  		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > >  				len ? ", " : "", "compression");
> > > +	if (f2fs_sb_has_casefold(sbi) && f2fs_sb_has_encrypt(sbi))
> > > +		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > > +				len ? ", " : "", "encrypted_casefold");
> > >  	len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > >  				len ? ", " : "", "pin_file");
> > >  	len += scnprintf(buf + len, PAGE_SIZE - len, "\n");

Looking at that pattern, why don't you just append "tag, "
each time and then replace the final ", " with "\n" at the end.

Although if I wanted to quickly parse that in (say) a shell
script I wouldn't really want the ",".
OTOH it is too late to change that.

	David

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