From owner-svn-src-all@FreeBSD.ORG Sat Feb 22 22:07:17 2014 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 34B4F91E; Sat, 22 Feb 2014 22:07:17 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 04E5A11ED; Sat, 22 Feb 2014 22:07:17 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.8/8.14.8) with ESMTP id s1MM7GMJ071557; Sat, 22 Feb 2014 22:07:16 GMT (envelope-from pfg@svn.freebsd.org) Received: (from pfg@localhost) by svn.freebsd.org (8.14.8/8.14.8/Submit) id s1MM7GJc071554; Sat, 22 Feb 2014 22:07:16 GMT (envelope-from pfg@svn.freebsd.org) Message-Id: <201402222207.s1MM7GJc071554@svn.freebsd.org> From: "Pedro F. Giffuni" Date: Sat, 22 Feb 2014 22:07:16 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r262346 - head/sys/fs/ext2fs X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Feb 2014 22:07:17 -0000 Author: pfg Date: Sat Feb 22 22:07:16 2014 New Revision: 262346 URL: http://svnweb.freebsd.org/changeset/base/262346 Log: ext2fs: fully enable ext4 read-only support. The ext4 developers tend to tag Ext4-specific flags as "incompatible" even when such features are not relevant for read-only support. This is a consequence of the process though which this filesystem is implemented without design and the fact that some new features are not extensible to ext2/3. Organize the features according to what we support and sort them so that we can now read-only mount filesystems with some features that may be found in newly formatted ext4 fs. Submitted by: Zheng Liu Reviewed by: pfg MFC after: 5 days Modified: head/sys/fs/ext2fs/ext2_vfsops.c head/sys/fs/ext2fs/ext2fs.h Modified: head/sys/fs/ext2fs/ext2_vfsops.c ============================================================================== --- head/sys/fs/ext2fs/ext2_vfsops.c Sat Feb 22 22:03:26 2014 (r262345) +++ head/sys/fs/ext2fs/ext2_vfsops.c Sat Feb 22 22:07:16 2014 (r262346) @@ -290,7 +290,8 @@ ext2_check_sb_compat(struct ext2fs *es, return (1); } if (es->e2fs_rev > E2FS_REV0) { - if (es->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) { + if (es->e2fs_features_incompat & ~(EXT2F_INCOMPAT_SUPP | + EXT4F_RO_INCOMPAT_SUPP)) { printf( "WARNING: mount of %s denied due to unsupported optional features\n", devtoname(dev)); Modified: head/sys/fs/ext2fs/ext2fs.h ============================================================================== --- head/sys/fs/ext2fs/ext2fs.h Sat Feb 22 22:03:26 2014 (r262345) +++ head/sys/fs/ext2fs/ext2fs.h Sat Feb 22 22:07:16 2014 (r262346) @@ -200,19 +200,26 @@ struct csum { * We support the following REV1 features: * - EXT2F_ROCOMPAT_SPARSESUPER * - EXT2F_ROCOMPAT_LARGEFILE + * - EXT2F_ROCOMPAT_EXTRA_ISIZE * - EXT2F_INCOMPAT_FTYPE * * We partially (read-only) support the following EXT4 features: * - EXT2F_ROCOMPAT_HUGE_FILE - * - EXT2F_ROCOMPAT_EXTRA_ISIZE * - EXT2F_INCOMPAT_EXTENTS + * + * We do not support these EXT4 features but they are irrelevant + * for read-only support: + * - EXT2F_INCOMPAT_FLEX_BG + * - EXT2F_INCOMPAT_META_BG */ -#define EXT2F_COMPAT_SUPP 0x0000 +#define EXT2F_COMPAT_SUPP EXT2F_COMPAT_DIRHASHINDEX #define EXT2F_ROCOMPAT_SUPP (EXT2F_ROCOMPAT_SPARSESUPER | \ EXT2F_ROCOMPAT_LARGEFILE | \ EXT2F_ROCOMPAT_EXTRA_ISIZE) -#define EXT2F_INCOMPAT_SUPP (EXT2F_INCOMPAT_FTYPE | \ - EXT2F_INCOMPAT_EXTENTS) +#define EXT2F_INCOMPAT_SUPP EXT2F_INCOMPAT_FTYPE +#define EXT4F_RO_INCOMPAT_SUPP (EXT2F_INCOMPAT_EXTENTS | \ + EXT2F_INCOMPAT_FLEX_BG | \ + EXT2F_INCOMPAT_META_BG ) /* Assume that user mode programs are passing in an ext2fs superblock, not * a kernel struct super_block. This will allow us to call the feature-test