linux-kernel - Re: [PATCH v17 04/10] fs/ntfs3: Add file operations and implementation

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Date:   Mon, 18 Jan 2021 16:24:39 +0200
From:   Kari Argillander <kari.argillander@...il.com>
To:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Cc:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pali@...nel.org" <pali@...nel.org>,
        "dsterba@...e.cz" <dsterba@...e.cz>,
        "aaptel@...e.com" <aaptel@...e.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "joe@...ches.com" <joe@...ches.com>,
        "mark@...mstone.com" <mark@...mstone.com>,
        "nborisov@...e.com" <nborisov@...e.com>,
        "linux-ntfs-dev@...ts.sourceforge.net" 
        <linux-ntfs-dev@...ts.sourceforge.net>,
        "anton@...era.com" <anton@...era.com>,
        "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        "hch@....de" <hch@....de>,
        "ebiggers@...nel.org" <ebiggers@...nel.org>,
        "andy.lavr@...il.com" <andy.lavr@...il.com>
Subject: Re: [PATCH v17 04/10] fs/ntfs3: Add file operations and
 implementation

On Mon, Jan 18, 2021 at 10:00:53AM +0000, Konstantin Komarov wrote:
> From: Kari Argillander <kari.argillander@...il.com>
> Sent: Monday, January 4, 2021 12:58 AM
> > On Thu, Dec 31, 2020 at 06:23:55PM +0300, Konstantin Komarov wrote:
 
> > > +static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
> > > +{

> > > +	/* Return error if mode is not supported */
> > > +	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
> > > +		     FALLOC_FL_COLLAPSE_RANGE))
> > > +		return -EOPNOTSUPP;

> > > +
> > > +	if (mode & FALLOC_FL_PUNCH_HOLE) {

> > > +	} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {

> > > +	} else {

> > > +		if (mode & FALLOC_FL_KEEP_SIZE) {
> > 
> > Isn't this hole else already (mode & FALLOC_FL_KEEP_SIZE?
> 
> Sorry, can you please clarify your question? Not sure, understood it.

I have hide unrelevant code now. So maybe now you see better what I
mean. Last else have to be already FALLOC_FL_KEEP_SIZE so if statment is
not needed.