On Fri, Apr 26, 2024 at 03:18:17PM +0800, Zhang Yi wrote: > I've had the same idea before, I asked Dave and he explained that Linux > could leak data beyond EOF page for some cases, e.g. mmap() can write to > the EOF page beyond EOF without failing, and the data in that EOF page > could be non-zeroed by mmap(), so the zeroing is still needed now. > > OTOH, if we free the delalloc and unwritten blocks beyond EOF blocks, he > said it could lead to some performance problems and make thinks > complicated to deal with the trimming of EOF block. Please see [1] > for details and maybe Dave could explain more. Oh well. Given that we're full in on the speculative allocations we might as well deal with it.
