Re: [PATCH RESEND v2] block/nvme: introduce PMR support from NVMe 1.4 spec

[Andrzej Jakowski]

On 3/11/20 2:20 AM, Stefan Hajnoczi wrote:
> Oh, I think I see what you mean.  That is not how the term
> "preallocated" is usually used in POSIX file systems.  File systems
> have sparse files by default and the term preallocation is used in the
> context of fadvise(2) for reserving space.
> 
> In this case I think you're saying the file cannot grow.  That is
> implicit since the BAR can't grow either so you could drop the comment
> about preallocation.

Yes, there is no need to have file preallocated in POSIX meaning. Actaul
requirement is to have file that is multiple of MiB and power-of-two in size.
User may (but may not need to) use fallocate/fadvise to fulfill this 
requirement.