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Date: Tue, 19 Sep 2017 08:55:28 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Theodore Ts'o <tytso@mit.edu>
Cc: Andreas Dilger <adilger@dilger.ca>,
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Subject: Re: [PATCH 4/7] xfs: Implement fallocate query support mode
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On Tue, Sep 19, 2017 at 10:55:20AM -0400, Theodore Ts'o wrote:
> Maybe the right answer is we should define a new pathconfat(2) system
> call which can be used as part of a C library's implementation of
> pathconf() and fpathconf()?  glibc probably won't use it for years, of
> course.  But we can at least provide the information via an interface
> which we can control, and which is capable of returning correct
> results?

glibc is very fast at picking up new kernel interface these days
as long as they aren't too controversial.  Implementing a syscall
that backs a function they implement should not be in the controversial
category I think.