From patchwork Fri May 6 00:29:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kani, Toshi" X-Patchwork-Id: 9028681 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D08DABF29F for ; Fri, 6 May 2016 00:39:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 016542012D for ; Fri, 6 May 2016 00:39:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 13441200E1 for ; Fri, 6 May 2016 00:39:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758062AbcEFAjE (ORCPT ); Thu, 5 May 2016 20:39:04 -0400 Received: from g1t5424.austin.hp.com ([15.216.225.54]:38273 "EHLO g1t5424.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758036AbcEFAjA (ORCPT ); Thu, 5 May 2016 20:39:00 -0400 Received: from g2t2360.austin.hpecorp.net (g2t2360.austin.hpecorp.net [16.196.225.135]) by g1t5424.austin.hp.com (Postfix) with ESMTP id D695B66; Fri, 6 May 2016 00:38:58 +0000 (UTC) Received: from misato.fc.hp.com (misato.fc.hp.com [16.78.168.61]) by g2t2360.austin.hpecorp.net (Postfix) with ESMTP id C2FCF46; Fri, 6 May 2016 00:38:57 +0000 (UTC) From: Toshi Kani To: dan.j.williams@intel.com, jack@suse.cz, david@fromorbit.com, viro@zeniv.linux.org.uk Cc: axboe@fb.com, hch@infradead.org, boaz@plexistor.com, tytso@mit.edu, adilger.kernel@dilger.ca, ross.zwisler@linux.intel.com, toshi.kani@hpe.com, micah.parrish@hpe.com, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 3/5] ext4: Add alignment check for DAX mount Date: Thu, 5 May 2016 18:29:54 -0600 Message-Id: <1462494596-20938-4-git-send-email-toshi.kani@hpe.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1462494596-20938-1-git-send-email-toshi.kani@hpe.com> References: <1462494596-20938-1-git-send-email-toshi.kani@hpe.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-9.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When a partition is not aligned by 4KB, mount -o dax succeeds, but any read/write access to the filesystem fails, except for metadata update. Call bdev_supports_dax() to perform proper precondition checks which includes this partition alignment check. Reported-by: Micah Parrish Signed-off-by: Toshi Kani Cc: "Theodore Ts'o" Cc: Andreas Dilger Cc: Jan Kara Cc: Dan Williams Cc: Ross Zwisler Cc: Christoph Hellwig Cc: Boaz Harrosh Reviewed-by: Jan Kara --- fs/ext4/super.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 304c712..e7ca71c 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3416,16 +3416,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) } if (sbi->s_mount_opt & EXT4_MOUNT_DAX) { - if (blocksize != PAGE_SIZE) { - ext4_msg(sb, KERN_ERR, - "error: unsupported blocksize for dax"); - goto failed_mount; - } - if (!sb->s_bdev->bd_disk->fops->direct_access) { - ext4_msg(sb, KERN_ERR, - "error: device does not support dax"); + err = bdev_supports_dax(sb, blocksize); + if (err) goto failed_mount; - } } if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {