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

[Al Viro]

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...