From patchwork Sat Mar 9 22:22:24 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 226398 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 608B12C0333 for ; Sun, 10 Mar 2013 09:25:59 +1100 (EST) Received: from localhost ([::1]:59871 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UESDF-0008HK-Is for incoming@patchwork.ozlabs.org; Sat, 09 Mar 2013 17:25:57 -0500 Received: from eggs.gnu.org ([208.118.235.92]:43502) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UESB4-0005Aw-9M for qemu-devel@nongnu.org; Sat, 09 Mar 2013 17:23:47 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UESB0-0008Pr-Pv for qemu-devel@nongnu.org; Sat, 09 Mar 2013 17:23:42 -0500 Received: from mx1.redhat.com ([209.132.183.28]:36133) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UESB0-0008Pm-He for qemu-devel@nongnu.org; Sat, 09 Mar 2013 17:23:38 -0500 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r29MNbZi010987 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sat, 9 Mar 2013 17:23:38 -0500 Received: from localhost (ovpn-112-17.ams2.redhat.com [10.36.112.17]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r29MNaXg024839; Sat, 9 Mar 2013 17:23:37 -0500 From: Stefan Hajnoczi To: Date: Sat, 9 Mar 2013 23:22:24 +0100 Message-Id: <1362867748-30528-5-git-send-email-stefanha@redhat.com> In-Reply-To: <1362867748-30528-1-git-send-email-stefanha@redhat.com> References: <1362867748-30528-1-git-send-email-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Kevin Wolf , dietmar@proxmox.com, Stefan Hajnoczi , Markus Armbruster Subject: [Qemu-devel] [RFC 4/8] block: add block_backup QMP command X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org @block-backup Start a point-in-time copy of a block device to a new destination. @device: the name of the device whose writes should be mirrored. @target: the target of the new image. If the file exists, or if it is a device, the existing file/device will be used as the new destination. If it does not exist, a new file will be created. @format: #optional the format of the new destination, default is to probe if @mode is 'existing', else the format of the source @mode: #optional whether and how QEMU should create a new image, default is 'absolute-paths'. @speed: #optional the maximum speed, in bytes per second Returns: nothing on success If @device is not a valid block device, DeviceNotFound Signed-off-by: Stefan Hajnoczi --- blockdev.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ qapi-schema.json | 28 +++++++++++++++++ qmp-commands.hx | 6 ++++ 3 files changed, 126 insertions(+) diff --git a/blockdev.c b/blockdev.c index 0e67d06..95a72de 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1208,6 +1208,98 @@ void qmp_block_commit(const char *device, drive_get_ref(drive_get_by_blockdev(bs)); } +void qmp_block_backup(const char *device, const char *target, + bool has_format, const char *format, + bool has_mode, enum NewImageMode mode, + bool has_speed, int64_t speed, + Error **errp) +{ + BlockDriverState *bs; + BlockDriverState *target_bs; + BlockDriver *proto_drv; + BlockDriver *drv = NULL; + Error *local_err = NULL; + int flags; + uint64_t size; + int ret; + + if (!has_speed) { + speed = 0; + } + if (!has_mode) { + mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS; + } + + bs = bdrv_find(device); + if (!bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + + if (!bdrv_is_inserted(bs)) { + error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); + return; + } + + if (!has_format) { + format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name; + } + if (format) { + drv = bdrv_find_format(format); + if (!drv) { + error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); + return; + } + } + + if (bdrv_in_use(bs)) { + error_set(errp, QERR_DEVICE_IN_USE, device); + return; + } + + flags = bs->open_flags | BDRV_O_RDWR; + + proto_drv = bdrv_find_protocol(target); + if (!proto_drv) { + error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); + return; + } + + bdrv_get_geometry(bs, &size); + size *= 512; + if (mode != NEW_IMAGE_MODE_EXISTING) { + assert(format && drv); + bdrv_img_create(target, format, + NULL, NULL, NULL, size, flags, &local_err, false); + } + + if (error_is_set(&local_err)) { + error_propagate(errp, local_err); + return; + } + + target_bs = bdrv_new(""); + ret = bdrv_open(target_bs, target, flags, drv); + + if (ret < 0) { + bdrv_delete(target_bs); + error_set(errp, QERR_OPEN_FILE_FAILED, target); + return; + } + + backup_start(bs, target_bs, speed, block_job_cb, bs, &local_err); + if (local_err != NULL) { + bdrv_delete(target_bs); + error_propagate(errp, local_err); + return; + } + + /* Grab a reference so hotplug does not delete the BlockDriverState from + * underneath us. + */ + drive_get_ref(drive_get_by_blockdev(bs)); +} + #define DEFAULT_MIRROR_BUF_SIZE (10 << 20) void qmp_drive_mirror(const char *device, const char *target, diff --git a/qapi-schema.json b/qapi-schema.json index 6b64aec..1dbf7b5 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -1716,6 +1716,34 @@ '*speed': 'int' } } ## +# @block-backup +# +# Start a point-in-time copy of a block device to a new destination. +# +# @device: the name of the device whose writes should be mirrored. +# +# @target: the target of the new image. If the file exists, or if it +# is a device, the existing file/device will be used as the new +# destination. If it does not exist, a new file will be created. +# +# @format: #optional the format of the new destination, default is to +# probe if @mode is 'existing', else the format of the source +# +# @mode: #optional whether and how QEMU should create a new image, default is +# 'absolute-paths'. +# +# @speed: #optional the maximum speed, in bytes per second +# +# Returns: nothing on success +# If @device is not a valid block device, DeviceNotFound +# +# Since 1.5 +## +{ 'command': 'block-backup', + 'data': { 'device': 'str', 'target': 'str', '*format': 'str', + '*mode': 'NewImageMode', '*speed': 'int' } } + +## # @drive-mirror # # Start mirroring a block device's writes to a new destination. diff --git a/qmp-commands.hx b/qmp-commands.hx index 95022e2..bda8eb4 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -889,6 +889,12 @@ EQMP }, { + .name = "block-backup", + .args_type = "device:B,target:s,speed:i?,mode:s?,format:s?", + .mhandler.cmd_new = qmp_marshal_input_block_backup, + }, + + { .name = "block-job-set-speed", .args_type = "device:B,speed:o", .mhandler.cmd_new = qmp_marshal_input_block_job_set_speed,