From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51518) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cqfNB-0000yy-2G for qemu-devel@nongnu.org; Wed, 22 Mar 2017 08:28:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cqfN9-00042g-UX for qemu-devel@nongnu.org; Wed, 22 Mar 2017 08:28:17 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38096) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cqfN9-00042N-M7 for qemu-devel@nongnu.org; Wed, 22 Mar 2017 08:28:15 -0400 From: Stefan Hajnoczi Date: Wed, 22 Mar 2017 11:16:00 +0000 Message-Id: <20170322111608.31230-1-stefanha@redhat.com> Subject: [Qemu-devel] [PATCH v3 0/8] qemu-img: add measure sub-command List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Eric Blake , Kevin Wolf , Maor Lipchuk , "Daniel P. Berrange" , Nir Soffer , Alberto Garcia , John Snow , Stefan Hajnoczi v3: * Drop RFC, this is ready to go for QEMU 2.10 * Use "required size" instead of "required bytes" in qemu-img output for consistency [Nir] * Clarify BlockMeasureInfo semantics [Max] * Clarify bdrv_measure() opts argument and error handling [Nir] * Handle -o backing_file= for qcow2 [Max] * Handle snapshot options in qemu-img measure * Probe input image for allocated data clusters for qcow2. Didn't centralize this because there are format-specific aspects such as the cluster_size. It may make sense to centralize it later (with a bit more complexity) if support is added to more formats. * Add qemu-img(1) man page section for 'measure' sub-command [Max] * Extend test case to cover additional scenarios [Nir] RFCv2: * Publishing RFC again to discuss the new user-visible interfaces. Code has changed quite a bit, I have not kept any Reviewed-by tags. * Rename qemu-img sub-command "measure" and API bdrv_measure() [Nir] * Report both "required bytes" and "fully allocated bytes" to handle the empty image file and prealloc use cases [Nir and Dan] * Use bdrv_getlength() instead of bdrv_nb_sectors() [Berto] * Rename "err" label "out" in qemu-img-cmds.c [Nir] * Add basic qcow2 support, doesn't support qemu-img convert from existing files yet RFCv1: * Publishing patch series with just raw support, no qcow2 yet. Please review the command-line interface and let me know if you are happy with this approach. Users and management tools sometimes need to know the size required for a new disk image so that an LVM volume, SAN LUN, etc can be allocated ahead of time. Image formats like qcow2 have non-trivial metadata that makes it hard to estimate the exact size without knowledge of file format internals. This patch series introduces a new qemu-img sub-command that calculates the required size for both image creation and conversion scenarios. The conversion scenario is: $ qemu-img measure -f raw -O qcow2 input.img required size: 1327680 fully allocated size: 1074069504 Here an existing image file is taken and the output includes the space required for data from the input image file. The creation scenario is: $ qemu-img measure -O qcow2 --size 5G required size: 327680 fully allocated size: 1074069504 Stefan Hajnoczi (8): block: add bdrv_measure() API raw-format: add bdrv_measure() support qcow2: extract preallocation calculation function qcow2: extract image creation option parsing qcow2: add bdrv_measure() support qemu-img: add measure subcommand qemu-iotests: support per-format golden output files iotests: add test 178 for qemu-img measure qapi/block-core.json | 25 +++ include/block/block.h | 4 + include/block/block_int.h | 2 + block.c | 35 ++++ block/qcow2.c | 362 +++++++++++++++++++++++++++++---------- block/raw-format.c | 22 +++ qemu-img.c | 227 ++++++++++++++++++++++++ qemu-img-cmds.hx | 6 + qemu-img.texi | 25 +++ tests/qemu-iotests/178 | 144 ++++++++++++++++ tests/qemu-iotests/178.out.qcow2 | 242 ++++++++++++++++++++++++++ tests/qemu-iotests/178.out.raw | 130 ++++++++++++++ tests/qemu-iotests/check | 5 + tests/qemu-iotests/group | 1 + 14 files changed, 1136 insertions(+), 94 deletions(-) create mode 100755 tests/qemu-iotests/178 create mode 100644 tests/qemu-iotests/178.out.qcow2 create mode 100644 tests/qemu-iotests/178.out.raw -- 2.9.3