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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id r138si7362645pgr.370.2019.02.18.07.15.50 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 18 Feb 2019 07:15:50 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=R+M7Hbt1; spf=pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=willy@infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Yd673/bZsI/lWohx4acadJrVu7fDWTLz4coEY1Do5u8=; b=R+M7Hbt1DbHpvsa13LNkodA1J +hR4HdHvnY1WV9XWZZdcFeiAARP88JlrqFGzw7nzqksn83w0Ac/q3PyT232lGxzXgbhzCDTRLpUln JCvruj/kizM0Lj96FHsMFF9IIshY7lHrECjoSkhEuxbI6akL3CRaSqTrUGfWtMWGCuck2JZQ34vxS onhxDsgIHn6KalBJKXZzzqislo6sy4y13wnRJ63c7EuvoEsoI+qYHsLYuom4XC+U7hKI9TDkrRlfo qj1lxsctR4QU7CJwReGTIGjzynKIzRgU2zxnNya1ZfgTv8RHR3t8IWTtxWlwIsDqkCJix7/MKlZyw tGpDOOzgg==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1gvke5-0002GP-J2; Mon, 18 Feb 2019 15:15:49 +0000 Date: Mon, 18 Feb 2019 07:15:49 -0800 From: Matthew Wilcox To: Adam Borowski Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Marcin =?utf-8?Q?=C5=9Alusarz?= Subject: Re: tmpfs fails fallocate(more than DRAM) Message-ID: <20190218151549.GS12668@bombadil.infradead.org> References: <20190218133423.tdzawczn4yjdzjqf@angband.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190218133423.tdzawczn4yjdzjqf@angband.pl> User-Agent: Mutt/1.9.2 (2017-12-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.004745, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Feb 18, 2019 at 02:34:23PM +0100, Adam Borowski wrote: > The returned error is ENOMEM rather than POSIX mandated ENOSPC (for > posix_allocate(), but our documentation doesn't mention ENOMEM for > Linux-specific fallocate() either). Returning -ENOMEM rather than -ENOSPC in this situation is clearly wrong, but just about every system call can return -ENOMEM. It might not even be due to memory allocation failure ... these days it's just "I am unusually short on resources, you've done nothing wrong, but I can't handle it right now".