Re: [PATCH 04/11] fs: add support for allowing applications to pass in write life time hints

[Al Viro <viro@xxxxxxxxxxxxxxxxxx>]

On Wed, Jun 14, 2017 at 09:15:03PM -0700, Darrick J. Wong wrote:
> > + */
> > +#define RWF_WRITE_LIFE_SHIFT		4
> > +#define RWF_WRITE_LIFE_MASK		0x000000f0 /* 4 bits of stream ID */
> > +#define RWF_WRITE_LIFE_SHORT		(1 << RWF_WRITE_LIFE_SHIFT)
> > +#define RWF_WRITE_LIFE_MEDIUM		(2 << RWF_WRITE_LIFE_SHIFT)
> > +#define RWF_WRITE_LIFE_LONG		(3 << RWF_WRITE_LIFE_SHIFT)
> > +#define RWF_WRITE_LIFE_EXTREME		(4 << RWF_WRITE_LIFE_SHIFT)
> 
> Should O_TMPFILE files ought to be created with i_write_hint =
> RWF_WRITE_LIFE_SHORT by default?

Depends...  One of the uses for that is to have them linked into permanent
place once completely written...