From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:48702) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1THFEE-0002qX-0I for qemu-devel@nongnu.org; Thu, 27 Sep 2012 10:38:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1THFE4-0003wY-HX for qemu-devel@nongnu.org; Thu, 27 Sep 2012 10:38:13 -0400 Received: from paradis.irqsave.net ([109.190.18.76]:41110) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1THFE4-0003wL-96 for qemu-devel@nongnu.org; Thu, 27 Sep 2012 10:38:04 -0400 From: =?UTF-8?q?Beno=C3=AEt=20Canet?= Date: Thu, 27 Sep 2012 16:29:57 +0200 Message-Id: <1348756198-10845-2-git-send-email-benoit@irqsave.net> In-Reply-To: <1348756198-10845-1-git-send-email-benoit@irqsave.net> References: <1348756198-10845-1-git-send-email-benoit@irqsave.net> Subject: [Qemu-devel] [partial RFC 1/2] qcow2: modify spec for deduplication List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, pbonzini@redhat.com, stefanha@linux.vnet.ibm.com, =?UTF-8?q?Beno=C3=AEt=20Canet?= --- docs/specs/qcow2.txt | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt index 36a559d..e8bc189 100644 --- a/docs/specs/qcow2.txt +++ b/docs/specs/qcow2.txt @@ -80,7 +80,10 @@ in the description of a field. tables to repair refcounts before accessing the image. - Bits 1-63: Reserved (set to 0) + Bit 1: Deduplication bit. If this bit is set then + deduplication is used on this image. + + Bits 2-63: Reserved (set to 0) 80 - 87: compatible_features Bitmask of compatible features. An implementation can @@ -116,6 +119,7 @@ be stored. Each extension has a structure like the following: 0x00000000 - End of the header extension area 0xE2792ACA - Backing file format name 0x6803f857 - Feature name table + 0xCD8E819B - Deduplication table offset and length other - Unknown header extension, can be safely ignored -- 1.7.10.4