linux-kernel - Re: [RFC PATCH V2 1/9] include/linux/pagemap.h: introduce attach/clear_page

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Date:   Fri, 1 May 2020 02:49:54 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Guoqing Jiang <guoqing.jiang@...ud.ionos.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        hch@...radead.org, david@...morbit.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        William Kucharski <william.kucharski@...cle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Yafang Shao <laoar.shao@...il.com>, Song Liu <song@...nel.org>,
        linux-raid@...r.kernel.org, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        Anton Altaparmakov <anton@...era.com>,
        linux-ntfs-dev@...ts.sourceforge.net,
        Mike Marshall <hubcap@...ibond.com>,
        Martin Brandenburg <martin@...ibond.com>,
        devel@...ts.orangefs.org, Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Roman Gushchin <guro@...com>,
        Andreas Dilger <adilger@...ger.ca>
Subject: Re: [RFC PATCH V2 1/9] include/linux/pagemap.h: introduce
 attach/clear_page_private

On Fri, May 01, 2020 at 02:42:29AM +0100, Al Viro wrote:
> On Thu, Apr 30, 2020 at 03:13:38PM -0700, Matthew Wilcox wrote:
> 
> > > +/**
> > > + * clear_page_private - clear page's private field and PG_private.
> > > + * @page: page to be cleared.
> > > + *
> > > + * The counterpart function of attach_page_private.
> > > + * Return: private data of page or NULL if page doesn't have private data.
> > > + */
> > 
> > Seems to me that the opposite of "attach" is "detach", not "clear".
> 
> Or "remove", perhaps...

Actually, "detach" is better - neither "clear" nor "remove" imply "... and give
me what used to be attached there", as this thing is doing.