From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49830) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1co5Fx-0000oZ-50 for qemu-devel@nongnu.org; Wed, 15 Mar 2017 05:30:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1co5Fw-0000Vx-4N for qemu-devel@nongnu.org; Wed, 15 Mar 2017 05:30:09 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55190) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1co5Fv-0000Ub-TL for qemu-devel@nongnu.org; Wed, 15 Mar 2017 05:30:08 -0400 From: Stefan Hajnoczi Date: Wed, 15 Mar 2017 17:29:37 +0800 Message-Id: <20170315092940.1367-6-stefanha@redhat.com> In-Reply-To: <20170315092940.1367-1-stefanha@redhat.com> References: <20170315092940.1367-1-stefanha@redhat.com> Subject: [Qemu-devel] [RFC v2 5/8] qcow2: add bdrv_measure() support List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Nir Soffer , Kevin Wolf , Maor Lipchuk , "Daniel P. Berrange" , Eric Blake , Alberto Garcia , John Snow , Stefan Hajnoczi Use qcow2_calc_prealloc_size() to get the required file size. Signed-off-by: Stefan Hajnoczi --- TODO: * Query block status and only count allocated clusters if in_bs != NULL * Exclude backing file clusters if in_bs != NULL and -o backing_file= is given --- block/qcow2.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/block/qcow2.c b/block/qcow2.c index 19be468..a4caf97 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2940,6 +2940,58 @@ static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) return 0; } +static void qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs, + BlockMeasureInfo *info, Error **errp) +{ + Error *local_err = NULL; + uint64_t allocated_bytes = 0; + uint64_t prealloc_size; + uint64_t size; + uint64_t refcount_bits; + size_t cluster_size; + int version; + + size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), + BDRV_SECTOR_SIZE); + + cluster_size = qcow2_opt_get_cluster_size_del(opts, &local_err); + if (local_err) { + goto err; + } + + version = qcow2_opt_get_version_del(opts, &local_err); + if (local_err) { + goto err; + } + + refcount_bits = qcow2_opt_get_refcount_bits_del(opts, version, &local_err); + if (local_err) { + goto err; + } + + if (in_bs) { + int64_t ssize = bdrv_getlength(in_bs); + if (ssize < 0) { + error_setg_errno(errp, -ssize, "Unable to get image size"); + return; + } + + size = ssize; + + /* TODO How many clusters are allocated modulo backing file in opts? */ + } + + prealloc_size = qcow2_calc_prealloc_size(size, cluster_size, + ctz32(refcount_bits)); + info->required_bytes = prealloc_size - (align_offset(size, cluster_size) - + allocated_bytes); + info->fully_allocated_bytes = prealloc_size; + return; + +err: + error_propagate(errp, local_err); +} + static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) { BDRVQcow2State *s = bs->opaque; @@ -3487,6 +3539,7 @@ BlockDriver bdrv_qcow2 = { .bdrv_snapshot_delete = qcow2_snapshot_delete, .bdrv_snapshot_list = qcow2_snapshot_list, .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, + .bdrv_measure = qcow2_measure, .bdrv_get_info = qcow2_get_info, .bdrv_get_specific_info = qcow2_get_specific_info, -- 2.9.3