From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39111) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afvE3-0000H9-Uw for qemu-devel@nongnu.org; Tue, 15 Mar 2016 16:05:58 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1afvE0-0008Pf-53 for qemu-devel@nongnu.org; Tue, 15 Mar 2016 16:05:55 -0400 Received: from mailhub.sw.ru ([195.214.232.25]:26488 helo=relay.sw.ru) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afvDz-0008PF-PA for qemu-devel@nongnu.org; Tue, 15 Mar 2016 16:05:52 -0400 From: Vladimir Sementsov-Ogievskiy Date: Tue, 15 Mar 2016 23:04:28 +0300 Message-Id: <1458072268-53705-23-git-send-email-vsementsov@virtuozzo.com> In-Reply-To: <1458072268-53705-1-git-send-email-vsementsov@virtuozzo.com> References: <1458072268-53705-1-git-send-email-vsementsov@virtuozzo.com> Subject: [Qemu-devel] [PATCH 22/22] qcow2-dirty-bitmap: add EXTRA_DATA_COMPATIBLE flag List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, vsementsov@virtuozzo.com, famz@redhat.com, qemu-block@nongnu.org, mreitz@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, den@openvz.org, jsnow@redhat.com If this flag is unset and exta data present the bitmap should be read-only. For now just return error for this case. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/qcow2-dirty-bitmap.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/block/qcow2-dirty-bitmap.c b/block/qcow2-dirty-bitmap.c index 159e935..95c166c 100644 --- a/block/qcow2-dirty-bitmap.c +++ b/block/qcow2-dirty-bitmap.c @@ -45,6 +45,7 @@ #define BME_RESERVED_FLAGS 0xfffffffc #define BME_FLAG_IN_USE 1 #define BME_FLAG_AUTO (1U << 1) +#define BME_FLAG_EXTRA_DATA_COMPATIBLE (1U << 1) /* bits [1, 8] U [56, 63] are reserved */ #define BME_TABLE_ENTRY_RESERVED_MASK 0xff000000000001fe @@ -333,6 +334,13 @@ static BdrvDirtyBitmap *load_bitmap(BlockDriverState *bs, QCow2Bitmap *bm, return NULL; } + if (!(bmh->flags & BME_FLAG_EXTRA_DATA_COMPATIBLE) && + bmh->extra_data_size != 0) { + error_setg(errp, "Uncompatible extra data found for bitmap '%s'", + bm->name); + return NULL; + } + bitmap_table = g_try_malloc(bmh->bitmap_table_size * sizeof(uint64_t)); if (bitmap_table == NULL) { error_setg_errno(errp, -ENOMEM, -- 1.8.3.1