From patchwork Thu May 2 02:26:42 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wayne Xia X-Patchwork-Id: 240883 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 C9CCC2C00D4 for ; Thu, 2 May 2013 12:30:19 +1000 (EST) Received: from localhost ([::1]:50870 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UXjHm-0005bZ-0l for incoming@patchwork.ozlabs.org; Wed, 01 May 2013 22:30:18 -0400 Received: from eggs.gnu.org ([208.118.235.92]:53324) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UXjG9-0003Qo-9a for qemu-devel@nongnu.org; Wed, 01 May 2013 22:28:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UXjG7-0002ns-T8 for qemu-devel@nongnu.org; Wed, 01 May 2013 22:28:37 -0400 Received: from e23smtp02.au.ibm.com ([202.81.31.144]:39629) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UXjG6-0002my-6T for qemu-devel@nongnu.org; Wed, 01 May 2013 22:28:35 -0400 Received: from /spool/local by e23smtp02.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 2 May 2013 12:20:19 +1000 Received: from d23relay03.au.ibm.com (d23relay03.au.ibm.com [9.190.235.21]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id EC2972CE804C for ; Thu, 2 May 2013 12:28:23 +1000 (EST) Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay03.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r422SHva19792116 for ; Thu, 2 May 2013 12:28:17 +1000 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r422SMED011114 for ; Thu, 2 May 2013 12:28:23 +1000 Received: from RH63Wenchao (wenchaox.cn.ibm.com [9.115.122.225]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r422QrHI008158; Thu, 2 May 2013 12:28:20 +1000 From: Wenchao Xia To: qemu-devel@nongnu.org Date: Thu, 2 May 2013 10:26:42 +0800 Message-Id: <1367461606-7554-2-git-send-email-xiawenc@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1367461606-7554-1-git-send-email-xiawenc@linux.vnet.ibm.com> References: <1367461606-7554-1-git-send-email-xiawenc@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13050202-5490-0000-0000-0000036159D8 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 202.81.31.144 Cc: kwolf@redhat.com, stefanha@gmail.com, dietmar@proxmox.com, pbonzini@redhat.com, Wenchao Xia Subject: [Qemu-devel] [PATCH V4 1/5] block: package preparation code in qmp_transaction() 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 The code before really committing is moved into a function. Most code are simply moved from qmp_transaction(), except that on fail it just return now. Other code such as input parsing is not touched, to make it easier in review. Signed-off-by: Wenchao Xia Reviewed-by: Eric Blake --- blockdev.c | 139 +++++++++++++++++++++++++++++++++--------------------------- 1 files changed, 77 insertions(+), 62 deletions(-) diff --git a/blockdev.c b/blockdev.c index 6e293e9..14784eb 100644 --- a/blockdev.c +++ b/blockdev.c @@ -785,6 +785,78 @@ typedef struct BlkTransactionStates { QSIMPLEQ_ENTRY(BlkTransactionStates) entry; } BlkTransactionStates; +static void external_snapshot_prepare(const char *device, + const char *format, + const char *new_image_file, + enum NewImageMode mode, + BlkTransactionStates *states, + Error **errp) +{ + BlockDriver *proto_drv; + BlockDriver *drv; + int flags, ret; + Error *local_err = NULL; + + drv = bdrv_find_format(format); + if (!drv) { + error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); + return; + } + + states->old_bs = bdrv_find(device); + if (!states->old_bs) { + error_set(errp, QERR_DEVICE_NOT_FOUND, device); + return; + } + + if (!bdrv_is_inserted(states->old_bs)) { + error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); + return; + } + + if (bdrv_in_use(states->old_bs)) { + error_set(errp, QERR_DEVICE_IN_USE, device); + return; + } + + if (!bdrv_is_read_only(states->old_bs)) { + if (bdrv_flush(states->old_bs)) { + error_set(errp, QERR_IO_ERROR); + return; + } + } + + flags = states->old_bs->open_flags; + + proto_drv = bdrv_find_protocol(new_image_file); + if (!proto_drv) { + error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); + return; + } + + /* create new image w/backing file */ + if (mode != NEW_IMAGE_MODE_EXISTING) { + bdrv_img_create(new_image_file, format, + states->old_bs->filename, + states->old_bs->drv->format_name, + NULL, -1, flags, &local_err, false); + if (error_is_set(&local_err)) { + error_propagate(errp, local_err); + return; + } + } + + /* We will manually add the backing_hd field to the bs later */ + states->new_bs = bdrv_new(""); + /* TODO Inherit bs->options or only take explicit options with an + * extended QMP command? */ + ret = bdrv_open(states->new_bs, new_image_file, NULL, + flags | BDRV_O_NO_BACKING, drv); + if (ret != 0) { + error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); + } +} + /* * 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail * then we do not pivot any of the devices in the group, and abandon the @@ -792,7 +864,6 @@ typedef struct BlkTransactionStates { */ void qmp_transaction(BlockdevActionList *dev_list, Error **errp) { - int ret = 0; BlockdevActionList *dev_entry = dev_list; BlkTransactionStates *states, *next; Error *local_err = NULL; @@ -806,9 +877,6 @@ void qmp_transaction(BlockdevActionList *dev_list, Error **errp) /* We don't do anything in this loop that commits us to the snapshot */ while (NULL != dev_entry) { BlockdevAction *dev_info = NULL; - BlockDriver *proto_drv; - BlockDriver *drv; - int flags; enum NewImageMode mode; const char *new_image_file; const char *device; @@ -831,70 +899,17 @@ void qmp_transaction(BlockdevActionList *dev_list, Error **errp) format = dev_info->blockdev_snapshot_sync->format; } mode = dev_info->blockdev_snapshot_sync->mode; - break; - default: - abort(); - } - - drv = bdrv_find_format(format); - if (!drv) { - error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); - goto delete_and_fail; - } - - states->old_bs = bdrv_find(device); - if (!states->old_bs) { - error_set(errp, QERR_DEVICE_NOT_FOUND, device); - goto delete_and_fail; - } - - if (!bdrv_is_inserted(states->old_bs)) { - error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); - goto delete_and_fail; - } - - if (bdrv_in_use(states->old_bs)) { - error_set(errp, QERR_DEVICE_IN_USE, device); - goto delete_and_fail; - } - - if (!bdrv_is_read_only(states->old_bs)) { - if (bdrv_flush(states->old_bs)) { - error_set(errp, QERR_IO_ERROR); - goto delete_and_fail; - } - } - - flags = states->old_bs->open_flags; - - proto_drv = bdrv_find_protocol(new_image_file); - if (!proto_drv) { - error_set(errp, QERR_INVALID_BLOCK_FORMAT, format); - goto delete_and_fail; - } - - /* create new image w/backing file */ - if (mode != NEW_IMAGE_MODE_EXISTING) { - bdrv_img_create(new_image_file, format, - states->old_bs->filename, - states->old_bs->drv->format_name, - NULL, -1, flags, &local_err, false); + external_snapshot_prepare(device, format, new_image_file, + mode, states, &local_err); if (error_is_set(&local_err)) { error_propagate(errp, local_err); goto delete_and_fail; } + break; + default: + abort(); } - /* We will manually add the backing_hd field to the bs later */ - states->new_bs = bdrv_new(""); - /* TODO Inherit bs->options or only take explicit options with an - * extended QMP command? */ - ret = bdrv_open(states->new_bs, new_image_file, NULL, - flags | BDRV_O_NO_BACKING, drv); - if (ret != 0) { - error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file); - goto delete_and_fail; - } }