Re: [PATCH 6/8] nowait aio: ext4

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On Mon, Apr 10, 2017 at 02:37:50PM +0200, Jan Kara wrote:
> I don't understand here. Do you want that all filesystems support NOWAIT
> direct IO?

No.  Per-file_system_type is way to coarse grained.  All feature flag
needs to be per-file_operation at least for cases like ext4 with our
without extents (or journal) XFS v4 vs v5, different NFS versions, etc.

For RWF_* each file operation simply declares if the feature is
supported not by rejecting unknown ones.  FIEMAP does the same as do
a few other interfaces.
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