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
