From: Amir Goldstein Subject: Re: [PATCH] libext2fs: reserve exclude bitmap fields in group descriptor Date: Thu, 15 Sep 2011 16:47:17 +0300 Message-ID: References: <20110915131606.GG15782@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Andreas Dilger , "Darrick J. Wong" , Sunil Mushran , Andi Kleen , Mingming Cao , Joel Becker , linux-ext4@vger.kernel.org, Coly Li , Yongqiang Yang To: "Ted Ts'o" Return-path: Received: from mail-yx0-f174.google.com ([209.85.213.174]:43833 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933879Ab1IONrS convert rfc822-to-8bit (ORCPT ); Thu, 15 Sep 2011 09:47:18 -0400 Received: by yxm8 with SMTP id 8so2160513yxm.19 for ; Thu, 15 Sep 2011 06:47:17 -0700 (PDT) In-Reply-To: <20110915131606.GG15782@thunk.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Thu, Sep 15, 2011 at 4:16 PM, Ted Ts'o wrote: > On Thu, Sep 15, 2011 at 09:50:20AM +0300, Amir Goldstein wrote: >> -#define EXT2_FEATURE_COMPAT_EXCLUDE_INODE =A0 =A0 =A00x0080 >> +/* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE =A0 0x0080 not used */ >> +#define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP =A0 =A0 0x0100 > > Why this change? =A0Is it because you're already using 0x0100 in > shipping systems? > I am using 0x80 in shipping systems and it signifies something a bit different then the proposed 0x100. EXCLUDE_INODE means that special inode 9 is used to reference exclude bitmap blocks. EXCLUDE_BITMAP means that exclude bitmap blocks are referenced from group descriptors. With this distinction it will be easier for me to make the migration. Thanks, Amir. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html