Message ID | 20230202204428.3267832-4-willy@infradead.org |
---|---|
State | New |
Headers | show
Return-Path: <SRS0=Pwo0=56=vger.kernel.org=linux-ext4-owner@ozlabs.org> X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org (client-ip=150.107.74.76; helo=gandalf.ozlabs.org; envelope-from=srs0=pwo0=56=vger.kernel.org=linux-ext4-owner@ozlabs.org; receiver=<UNKNOWN>) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=LI7K/fD5; dkim-atps=neutral Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4P79l63538z23hn for <incoming@patchwork.ozlabs.org>; Fri, 3 Feb 2023 07:44:50 +1100 (AEDT) Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4P79l62fmyz4xyt for <incoming@patchwork.ozlabs.org>; Fri, 3 Feb 2023 07:44:50 +1100 (AEDT) Received: by gandalf.ozlabs.org (Postfix) id 4P79l62c1Fz4y06; Fri, 3 Feb 2023 07:44:50 +1100 (AEDT) Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: gandalf.ozlabs.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: gandalf.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-ext4-owner@vger.kernel.org; receiver=<UNKNOWN>) Authentication-Results: gandalf.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=LI7K/fD5; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4P79l62TCqz4xyt for <patchwork-incoming@ozlabs.org>; Fri, 3 Feb 2023 07:44:50 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232930AbjBBUoh (ORCPT <rfc822;patchwork-incoming@ozlabs.org>); Thu, 2 Feb 2023 15:44:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231345AbjBBUof (ORCPT <rfc822;linux-ext4@vger.kernel.org>); Thu, 2 Feb 2023 15:44:35 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C4F7746A5; Thu, 2 Feb 2023 12:44:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=7vw66D2vDIhBX9oEFJWgWei9pEvFRsbTDrfadEvnVH0=; b=LI7K/fD5Vk/tdkvyGHcHCHPIn3 ki8YM6I42VIZSzQNTxPrzW20eQcMlMiBbgoAoAw8253XrGoeMklOlEKMUxU2uC2X6XcBepRXQM2wQ YATyAgvwBIxy4fzWAmTKtS8Uj2OY3SvCwtjfcCu15kPUtBjNTOq46bndEOSVGF8Ub11cNCBl93Vg9 SWkM5MsQ0M+rvDWlwv+bSz97kX6B7VYPTSLxZ9dgDzRfutfB6502mkCo5mEQs0xsV8HA8rHlCRSdS KOTUidRSNdF7Zes+5Cdj1siYfhphWwyw25V0So6hp97947mMQ7zwQbXNCDbg4RdAq7LzH3UQO0x0G oB6KKg6g==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pNgRb-00Di7X-Bg; Thu, 02 Feb 2023 20:44:31 +0000 From: "Matthew Wilcox (Oracle)" <willy@infradead.org> To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>, linux-afs@lists.infradead.org, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-mm@kvack.org, Hugh Dickins <hughd@google.com>, linux-kernel@vger.kernel.org, fstests@vger.kernel.org Subject: [PATCH 3/5] tmpfs: Zero bytes after 'oldsize' if we're expanding the file Date: Thu, 2 Feb 2023 20:44:25 +0000 Message-Id: <20230202204428.3267832-4-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230202204428.3267832-1-willy@infradead.org> References: <20230202204428.3267832-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: <linux-ext4.vger.kernel.org> X-Mailing-List: linux-ext4@vger.kernel.org |
Series |
Fix a minor POSIX conformance problem
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expand
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diff --git a/mm/shmem.c b/mm/shmem.c index 0005ab2c29af..2c8e8b417b00 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1124,6 +1124,8 @@ static int shmem_setattr(struct user_namespace *mnt_userns, if (oldsize > holebegin) unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); + } else { + shmem_truncate_range(inode, oldsize, newsize); } }
POSIX requires that "If the file size is increased, the extended area shall appear as if it were zero-filled". It is possible to use mmap to write past EOF and that data will become visible instead of zeroes. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- mm/shmem.c | 2 ++ 1 file changed, 2 insertions(+)