Re: [PATCH] xfs: getattr ignore blocks beyond eof

[Dave Chinner]

On Thu, Mar 31, 2022 at 04:33:40PM +1100, Dave Chinner wrote:
> On Thu, Mar 31, 2022 at 11:28:59AM +0800, wang.yi59@xxxxxxxxxx wrote:
> > The above problems can be explained by fs preallocation.
> > If the impact of preallocation are closed in fs, not visible to
> > the outside, the result is stable and real for the application.
....

> If your application is dependent on block counts exactly matching
> the file data space for waht ever reason, then what speculative
> preallocation does is the least of your problems.

That said, if you have written an application that cannot handle
this behaviour, then you can *turn it off* by using the allocsize
mount option. But then subsequent file fragmentation issues are your
own problem to solve, not ours.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx