linux-kernel - Re: [PATCH v4 09/10] hugetlbfs: add hugetlbfs

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Date:	Wed, 22 Jul 2015 15:30:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Kravetz <mike.kravetz@...cle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	David Rientjes <rientjes@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Christoph Hellwig <hch@...radead.org>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v4 09/10] hugetlbfs: add hugetlbfs_fallocate()

On Wed, 22 Jul 2015 15:23:42 -0700 Mike Kravetz <mike.kravetz@...cle.com> wrote:

> On 07/22/2015 03:03 PM, Andrew Morton wrote:
> > On Tue, 21 Jul 2015 11:09:43 -0700 Mike Kravetz <mike.kravetz@...cle.com> wrote:
> ...
> >> +
> >> +	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
> >> +		return -EOPNOTSUPP;
> >
> > EOPNOTSUPP is a networking thing.  It's inappropriate here.
> >
> > The problem is that if this error is ever returned to userspace, the
> > user will be sitting looking at "Operation not supported on transport
> > endpoint" and wondering what went wrong in the networking stack.
> 
> Trying to follow FALLOCATE(2) man page:
> 
> "EOPNOTSUPP
> 	The filesystem containing the file referred to by  fd  does  not
> 	support  this  operation;  or  the  mode is not supported by the
> 	filesystem containing the file referred to by fd."
> 

Sigh.
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