Re: vfs/xfs: directio updates to ease COW handling V2

[Jeff Moyer <jmoyer@xxxxxxxxxx>]

Hi, Christoph,

Can you explain a bit what you mean by easing COW handling?  Whenever I
see COW referenced near DIO, my mind always turns to g_u_p vs. fork.

Thanks!
Jeff

Christoph Hellwig <hch@xxxxxx> writes:

> See http://www.infradead.org/rpr.html
>
> The first patch ensures ->end_io is always called for direct I/O requests
> that pass it in, even if there was a zero length write, or if an error
> occured.  The existing users have been updated to ignore it, but XFS
> will make use of it in the future, and a comment in ext4 suggests it
> might be useful for it as well.
>
> The other two simplify the XFS direct I/O code.
>
> Changes since V1:
>  - allow ->end_io to return errors
>  - a comment spelling fix
>
>
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