From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:41462) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Qmf21-0002Rq-CX for qemu-devel@nongnu.org; Fri, 29 Jul 2011 00:50:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Qmf20-0000Sp-EL for qemu-devel@nongnu.org; Fri, 29 Jul 2011 00:50:41 -0400 Received: from mail-iy0-f173.google.com ([209.85.210.173]:46817) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Qmf20-0000NN-5g for qemu-devel@nongnu.org; Fri, 29 Jul 2011 00:50:40 -0400 Received: by mail-iy0-f173.google.com with SMTP id 39so4186308iyb.4 for ; Thu, 28 Jul 2011 21:50:39 -0700 (PDT) From: Devin Nakamura Date: Fri, 29 Jul 2011 00:49:49 -0400 Message-Id: <1311914994-20482-20-git-send-email-devin122@gmail.com> In-Reply-To: <1311914994-20482-1-git-send-email-devin122@gmail.com> References: <1311914994-20482-1-git-send-email-devin122@gmail.com> Subject: [Qemu-devel] [RFC 19/24] qcow2: add qcow2_copy_header() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, Devin Nakamura Signed-off-by: Devin Nakamura --- block/qcow2.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 54 insertions(+), 0 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index b75364d..3bb28d2 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1374,6 +1374,59 @@ static int qcow2_get_mapping(BlockDriverState *bs, uint64_t *guest_offset, return 0; } +static int qcow2_copy_header(BlockDriverState *bs) +{ + BlockDriverState *backup; + uint8_t buffer[512]; + int ret; + QCowHeader header; + BDRVQcowState *s = bs->opaque; + ret = qcow2_cache_flush(bs, s->l2_table_cache); + if (ret) { + return ret; + } + + /*TODO: change filename*/ + bdrv_create_file("headerbackup.temp", NULL); + bdrv_file_open(&backup, "headerbackup.temp", BDRV_O_RDWR); + bdrv_read(bs->file, 0, buffer, 1); /*TODO: check return code*/ + bdrv_write(backup, 0, buffer, 1); /*TODO: check return code*/ + bdrv_close(backup); + + header.magic = QCOW_MAGIC; + header.version = 2; + header.backing_file_offset = 0; + header.backing_file_size = 0; + header.size = bs->total_sectors << BDRV_SECTOR_BITS; + header.cluster_bits = s->cluster_bits; + header.crypt_method = QCOW_CRYPT_NONE; + header.l1_table_offset = s->l1_table_offset; + header.l1_size = s->l1_size; + header.refcount_table_offset = s->refcount_table_offset; + header.refcount_table_clusters = s->refcount_table_size; /*TODO: FIXME*/ + header.snapshots_offset = s->snapshots_offset; + header.nb_snapshots = s->nb_snapshots; + + cpu_to_be64s(&header.backing_file_offset); + cpu_to_be32s(&header.backing_file_size); + cpu_to_be32s(&header.cluster_bits); + cpu_to_be32s(&header.crypt_method); + cpu_to_be32s(&header.l1_size); + cpu_to_be64s(&header.l1_table_offset); + cpu_to_be32s(&header.magic); + cpu_to_be32s(&header.nb_snapshots); + cpu_to_be32s(&header.refcount_table_clusters); + cpu_to_be64s(&header.refcount_table_offset); + cpu_to_be64s(&header.size); + cpu_to_be64s(&header.snapshots_offset); + cpu_to_be32s(&header.version); + ret = bdrv_pwrite_sync(bs->file, 0, &header, sizeof(QCowHeader)); + if (ret) { + return ret; + } + return qcow2_drop_leaked_clusters(bs); +} + static QEMUOptionParameter qcow2_create_options[] = { { .name = BLOCK_OPT_SIZE, @@ -1446,6 +1499,7 @@ static BlockDriver bdrv_qcow2 = { .bdrv_get_mapping = qcow2_get_mapping, .bdrv_map = qcow2_map, + .bdrv_copy_header = qcow2_copy_header, }; static void bdrv_qcow2_init(void) -- 1.7.6.rc1