From patchwork Tue Dec 1 23:21:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Sandeen X-Patchwork-Id: 11944265 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FCFDC64E7A for ; Tue, 1 Dec 2020 23:23:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9EDC2222A for ; Tue, 1 Dec 2020 23:23:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726952AbgLAXXP (ORCPT ); Tue, 1 Dec 2020 18:23:15 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:22059 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726852AbgLAXXP (ORCPT ); Tue, 1 Dec 2020 18:23:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606864908; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=/VrWq4ROZEETaUG6m+Wv8n9gH98JhhhsUtPF4KnUL34=; b=cG6Q6PYaC6038yM32uUs7dDDR9TpnovVQesCrVOmhKe/wVWslogRtjhcsgbisQU/a1dCta P9Eh7rmI+yEbdRUdbeWQqFPVgMRRiIhy3dh1WhTOjXXY0tqzAR1qVkKMjon31OZIe8yMe/ fAybrrFN7s/6jHQ+hmxnuirFRdaXyK4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-26-T4dzLGELMqmpzahP1zvfXw-1; Tue, 01 Dec 2020 18:21:46 -0500 X-MC-Unique: T4dzLGELMqmpzahP1zvfXw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 49DF01076027; Tue, 1 Dec 2020 23:21:45 +0000 (UTC) Received: from liberator.sandeen.net (ovpn04.gateway.prod.ext.phx2.redhat.com [10.5.9.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4189010013C1; Tue, 1 Dec 2020 23:21:41 +0000 (UTC) From: Eric Sandeen Subject: [PATCH V2] uapi: fix statx attribute value overlap for DAX & MOUNT_ROOT To: torvalds@linux-foundation.org, Miklos Szeredi , Ira Weiny , David Howells Cc: linux-fsdevel@vger.kernel.org, linux-man@vger.kernel.org, linux-kernel@vger.kernel.org, xfs , linux-ext4@vger.kernel.org, Xiaoli Feng , Eric Sandeen Message-ID: <3e28d2c7-fbe5-298a-13ba-dcd8fd504666@redhat.com> Date: Tue, 1 Dec 2020 17:21:40 -0600 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org [*] Note: This needs to be merged as soon as possible as it's introducing an incompatible UAPI change... STATX_ATTR_MOUNT_ROOT and STATX_ATTR_DAX got merged with the same value, so one of them needs fixing. Move STATX_ATTR_DAX. While we're in here, clarify the value-matching scheme for some of the attributes, and explain why the value for DAX does not match. Fixes: 80340fe3605c ("statx: add mount_root") Fixes: 712b2698e4c0 ("fs/stat: Define DAX statx attribute") Reported-by: David Howells Signed-off-by: Eric Sandeen Reviewed-by: David Howells Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Reviewed-by: Ira Weiny --- V2: Change flag value per Darrick Wong Tweak comment per Darrick Wong Add Fixes: tags & reported-by & RVB per dhowells include/uapi/linux/stat.h | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h index 82cc58fe9368..1500a0f58041 100644 --- a/include/uapi/linux/stat.h +++ b/include/uapi/linux/stat.h @@ -171,9 +171,12 @@ struct statx { * be of use to ordinary userspace programs such as GUIs or ls rather than * specialised tools. * - * Note that the flags marked [I] correspond to generic FS_IOC_FLAGS + * Note that the flags marked [I] correspond to the FS_IOC_SETFLAGS flags * semantically. Where possible, the numerical value is picked to correspond - * also. + * also. Note that the DAX attribute indicates that the file is in the CPU + * direct access state. It does not correspond to the per-inode flag that + * some filesystems support. + * */ #define STATX_ATTR_COMPRESSED 0x00000004 /* [I] File is compressed by the fs */ #define STATX_ATTR_IMMUTABLE 0x00000010 /* [I] File is marked immutable */ @@ -183,7 +186,7 @@ struct statx { #define STATX_ATTR_AUTOMOUNT 0x00001000 /* Dir: Automount trigger */ #define STATX_ATTR_MOUNT_ROOT 0x00002000 /* Root of a mount */ #define STATX_ATTR_VERITY 0x00100000 /* [I] Verity protected file */ -#define STATX_ATTR_DAX 0x00002000 /* [I] File is DAX */ +#define STATX_ATTR_DAX 0x00200000 /* File is currently in DAX state */ #endif /* _UAPI_LINUX_STAT_H */