linux-kernel - Re: [PATCH -v7 2/2] Update ctime and mtime for memory-mapped files

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Message-ID: <4df4ef0c0801211757y1f751bbbv4ce4bbf7455a68c@mail.gmail.com>
Date:	Tue, 22 Jan 2008 04:57:19 +0300
From:	"Anton Salikhmetov" <salikhmetov@...il.com>
To:	"Jesper Juhl" <jesper.juhl@...il.com>
Cc:	linux-mm@...ck.org, jakob@...hought.net,
	linux-kernel@...r.kernel.org, valdis.kletnieks@...edu,
	riel@...hat.com, ksm@...dk, staubach@...hat.com,
	torvalds@...ux-foundation.org, a.p.zijlstra@...llo.nl,
	akpm@...ux-foundation.org, protasnb@...il.com, miklos@...redi.hu,
	r.e.wolff@...wizard.nl, hidave.darkstar@...il.com,
	hch@...radead.org
Subject: Re: [PATCH -v7 2/2] Update ctime and mtime for memory-mapped files

2008/1/22, Jesper Juhl <jesper.juhl@...il.com>:
> On 22/01/2008, Anton Salikhmetov <salikhmetov@...il.com> wrote:
> > 2008/1/22, Jesper Juhl <jesper.juhl@...il.com>:
> > > Some very pedantic nitpicking below;
> > >
> > > On 22/01/2008, Anton Salikhmetov <salikhmetov@...il.com> wrote:
> ...
> > > > +               if (file && (vma->vm_flags & VM_SHARED)) {
> > > > +                       if (flags & MS_ASYNC)
> > > > +                               vma_wrprotect(vma);
> > > > +                       if (flags & MS_SYNC) {
> > >
> > > "else if" ??
> >
> > The MS_ASYNC and MS_SYNC flags are mutually exclusive, that is why I
> > did not use the "else-if" here. Moreover, this function itself checks
> > that they never come together.
> >
>
> I would say that them being mutually exclusive would be a reason *for*
> using "else-if" here.

This check is performed by the sys_msync() function itself in its very
beginning.

We don't need to check it later.

>
> --
> Jesper Juhl <jesper.juhl@...il.com>
> Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
> Plain text mails only, please      http://www.expita.com/nomime.html
>
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