From patchwork Thu Dec 13 01:50:08 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Snow X-Patchwork-Id: 10727511 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 856F691E for ; Thu, 13 Dec 2018 01:54:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6A3662968F for ; Thu, 13 Dec 2018 01:54:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5E89C2A36D; Thu, 13 Dec 2018 01:54:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CA6FF2968F for ; Thu, 13 Dec 2018 01:54:53 +0000 (UTC) Received: from localhost ([::1]:49867 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gXGDF-0005xN-0n for patchwork-qemu-devel@patchwork.kernel.org; Wed, 12 Dec 2018 20:54:53 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42486) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gXG9A-0002Pg-IP for qemu-devel@nongnu.org; Wed, 12 Dec 2018 20:50:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gXG96-0001Jb-HI for qemu-devel@nongnu.org; Wed, 12 Dec 2018 20:50:40 -0500 Received: from mx1.redhat.com ([209.132.183.28]:43292) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gXG8x-000143-0a; Wed, 12 Dec 2018 20:50:29 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 40C0DA7390; Thu, 13 Dec 2018 01:50:19 +0000 (UTC) Received: from probe.bos.redhat.com (dhcp-17-232.bos.redhat.com [10.18.17.232]) by smtp.corp.redhat.com (Postfix) with ESMTP id 578AA60BE4; Thu, 13 Dec 2018 01:50:18 +0000 (UTC) From: John Snow To: qemu-block@nongnu.org, qemu-devel@nongnu.org Date: Wed, 12 Dec 2018 20:50:08 -0500 Message-Id: <20181213015013.15350-3-jsnow@redhat.com> In-Reply-To: <20181213015013.15350-1-jsnow@redhat.com> References: <20181213015013.15350-1-jsnow@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 13 Dec 2018 01:50:19 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 2/7] blockdev: n-ary bitmap merge X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Vladimir Sementsov-Ogievskiy , Markus Armbruster , Max Reitz , John Snow Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Especially outside of transactions, it is helpful to provide all-or-nothing semantics for bitmap merges. This facilitates the coalescing of multiple bitmaps into a single target for the "checkpoint" interpretation when assembling bitmaps that represent arbitrary points in time from component bitmaps. This is an incompatible change from the preliminary version of the API. Signed-off-by: John Snow Reviewed-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy --- blockdev.c | 64 +++++++++++++++++++++++++++++--------------- qapi/block-core.json | 22 +++++++-------- 2 files changed, 53 insertions(+), 33 deletions(-) diff --git a/blockdev.c b/blockdev.c index 1ba706df8b..0f740fd964 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2122,33 +2122,26 @@ static void block_dirty_bitmap_disable_abort(BlkActionState *common) } } +void do_block_dirty_bitmap_merge(const char *node, const char *target, + strList *bitmaps, HBitmap **backup, + Error **errp); + static void block_dirty_bitmap_merge_prepare(BlkActionState *common, Error **errp) { BlockDirtyBitmapMerge *action; BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState, common, common); - BdrvDirtyBitmap *merge_source; if (action_check_completion_mode(common, errp) < 0) { return; } action = common->action->u.x_block_dirty_bitmap_merge.data; - state->bitmap = block_dirty_bitmap_lookup(action->node, - action->dst_name, - &state->bs, - errp); - if (!state->bitmap) { - return; - } - merge_source = bdrv_find_dirty_bitmap(state->bs, action->src_name); - if (!merge_source) { - return; - } - - bdrv_merge_dirty_bitmap(state->bitmap, merge_source, &state->backup, errp); + do_block_dirty_bitmap_merge(action->node, action->target, + action->bitmaps, &state->backup, + errp); } static void abort_prepare(BlkActionState *common, Error **errp) @@ -2980,24 +2973,51 @@ void qmp_x_block_dirty_bitmap_disable(const char *node, const char *name, bdrv_disable_dirty_bitmap(bitmap); } -void qmp_x_block_dirty_bitmap_merge(const char *node, const char *dst_name, - const char *src_name, Error **errp) +void do_block_dirty_bitmap_merge(const char *node, const char *target, + strList *bitmaps, HBitmap **backup, + Error **errp) { BlockDriverState *bs; - BdrvDirtyBitmap *dst, *src; + BdrvDirtyBitmap *dst, *src, *anon; + strList *lst; + Error *local_err = NULL; - dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp); + dst = block_dirty_bitmap_lookup(node, target, &bs, errp); if (!dst) { return; } - src = bdrv_find_dirty_bitmap(bs, src_name); - if (!src) { - error_setg(errp, "Dirty bitmap '%s' not found", src_name); + anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), + NULL, errp); + if (!anon) { return; } - bdrv_merge_dirty_bitmap(dst, src, NULL, errp); + for (lst = bitmaps; lst; lst = lst->next) { + src = bdrv_find_dirty_bitmap(bs, lst->value); + if (!src) { + error_setg(errp, "Dirty bitmap '%s' not found", lst->value); + goto out; + } + + bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err); + if (local_err) { + error_propagate(errp, local_err); + goto out; + } + } + + /* Merge into dst; dst is unchanged on failure. */ + bdrv_merge_dirty_bitmap(dst, anon, backup, errp); + + out: + bdrv_release_dirty_bitmap(bs, anon); +} + +void qmp_x_block_dirty_bitmap_merge(const char *node, const char *target, + strList *bitmaps, Error **errp) +{ + do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp); } BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, diff --git a/qapi/block-core.json b/qapi/block-core.json index d4fe710836..320d74ef34 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -1818,14 +1818,14 @@ # # @node: name of device/node which the bitmap is tracking # -# @dst_name: name of the destination dirty bitmap +# @target: name of the destination dirty bitmap # -# @src_name: name of the source dirty bitmap +# @bitmaps: name(s) of the source dirty bitmap(s) # # Since: 3.0 ## { 'struct': 'BlockDirtyBitmapMerge', - 'data': { 'node': 'str', 'dst_name': 'str', 'src_name': 'str' } } + 'data': { 'node': 'str', 'target': 'str', 'bitmaps': ['str'] } } ## # @block-dirty-bitmap-add: @@ -1940,23 +1940,23 @@ ## # @x-block-dirty-bitmap-merge: # -# FIXME: Rename @src_name and @dst_name to src-name and dst-name. -# -# Merge @src_name dirty bitmap to @dst_name dirty bitmap. @src_name dirty -# bitmap is unchanged. On error, @dst_name is unchanged. +# Merge dirty bitmaps listed in @bitmaps to the @target dirty bitmap. +# The @bitmaps dirty bitmaps are unchanged. +# On error, @target is unchanged. # # Returns: nothing on success # If @node is not a valid block device, DeviceNotFound -# If @dst_name or @src_name is not found, GenericError -# If bitmaps has different sizes or granularities, GenericError +# If any bitmap in @bitmaps or @target is not found, GenericError +# If any of the bitmaps have different sizes or granularities, +# GenericError # # Since: 3.0 # # Example: # # -> { "execute": "x-block-dirty-bitmap-merge", -# "arguments": { "node": "drive0", "dst_name": "bitmap0", -# "src_name": "bitmap1" } } +# "arguments": { "node": "drive0", "target": "bitmap0", +# "bitmaps": ["bitmap1"] } } # <- { "return": {} } # ##