linux-ext4 - Re: [PATCH] e4defrag: fix build when posix

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Date:	Wed, 1 Jan 2014 12:37:44 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Baruch Siach <baruch@...s.co.il>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] e4defrag: fix build when posix_fadvise is missing

On Wed, Jan 01, 2014 at 07:31:46PM +0200, Baruch Siach wrote:
> > Or do you mean that for some reason, uClibc is not providing
> > posix_fadvise on all architectures, even though the kernel supports it?
> > 
> > That seems wierd.
> 
> The xtensa architecture has __NR_fadvise64_64 but not __NR_fadvise64. Should I 
> clarify this in the commit log?

Is uClibc providing a posix_fadvise64()?  Maybe the better fix would be
to try to use posix_fadvise64 if it is exists, with posix_fadvise()
and the locally defined posix_fadvise() as fallbacks.

If not, why is uClibc not providing any userspace access to
posix_fadvise, if the kernel suppots it, and it's insisting on
providing a function delcaration for it?

						- Ted
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