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

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Date:	Wed, 22 Jul 2015 15:23:42 -0700
From:	Mike Kravetz <mike.kravetz@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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 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."

-- 
Mike Kravetz
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