linux-kernel - Re: [FSAIO][PATCH 6/8] Enable asynchronous wait page and lock page

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Date:	Thu, 28 Dec 2006 20:17:17 +0530
From:	Suparna Bhattacharya <suparna@...ibm.com>
To:	Christoph Hellwig <hch@...radead.org>, linux-aio@...ck.org,
	akpm@...l.org, drepper@...hat.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, jakub@...hat.com, mingo@...e.hu
Subject: Re: [FSAIO][PATCH 6/8] Enable asynchronous wait page and lock page

On Thu, Dec 28, 2006 at 11:55:10AM +0000, Christoph Hellwig wrote:
> On Thu, Dec 28, 2006 at 02:11:49PM +0530, Suparna Bhattacharya wrote:
> > -extern void FASTCALL(lock_page_slow(struct page *page));
> > +extern int FASTCALL(__lock_page_slow(struct page *page, wait_queue_t *wait));
> >  extern void FASTCALL(__lock_page_nosync(struct page *page));
> >  extern void FASTCALL(unlock_page(struct page *page));
> >
> >  /*
> >   * lock_page may only be called if we have the page's inode pinned.
> >   */
> > -static inline void lock_page(struct page *page)
> > +static inline int __lock_page(struct page *page, wait_queue_t *wait)
> >  {
> >  	might_sleep();
> >  	if (TestSetPageLocked(page))
> > -		lock_page_slow(page);
> > +		return __lock_page_slow(page, wait);
> > +	return 0;
> >  }
> >
> > +#define lock_page(page)		__lock_page(page, &current->__wait.wait)
> > +#define lock_page_slow(page)	__lock_page_slow(page, &current->__wait.wait)
> 
> Can we please simply kill your lock_page_slow wrapper and rename the
> arguments taking __lock_page_slow to lock_page_slow?  All too many
> variants of the locking functions aren't all that useful and there's
> very few users.

OK.

> 
> Similarly I don't really think __lock_page is an all that useful name here.
> What about lock_page_wq?  or aio_lock_page to denote it has special

I am really bad with names :(  I tried using the _wq suffixes earlier and
that seemed confusing to some, but if no one else objects I'm happy to use
that. I thought aio_lock_page() might be misleading because it is
synchronous if a regular wait queue entry is passed in, but again it may not
be too bad.

What's your preference ? Does anything more intuitive come to mind ?

> meaning in aio contect?  Then again because of these special sematics
> we need a bunch of really verbose kerneldoc comments for this function
> famility.

Regards
Suparna

-- 
Suparna Bhattacharya (suparna@...ibm.com)
Linux Technology Center
IBM Software Lab, India

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