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Sat, 13 Jul 2024 23:59:38 +0200 (CEST) X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Vincent Vanlaer To: qemu-devel@nongnu.org Cc: John Snow , Vladimir Sementsov-Ogievskiy , Kevin Wolf , qemu-block@nongnu.org, Hanna Reitz , Vincent Vanlaer Subject: [PATCH v2 2/4] block: refactor commit_run for multiple write types Date: Sat, 13 Jul 2024 23:56:42 +0200 Message-ID: <20240713215644.742244-3-libvirt-e6954efa@volkihar.be> X-Mailer: git-send-email 2.44.1 In-Reply-To: <20240713215644.742244-1-libvirt-e6954efa@volkihar.be> References: <20240713215644.742244-1-libvirt-e6954efa@volkihar.be> MIME-Version: 1.0 Received-SPF: pass client-ip=134.58.240.133; envelope-from=libvirt-e6954efa@volkihar.be; helo=icts-p-cavuit-3.kulnet.kuleuven.be X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Signed-off-by: Vincent Vanlaer Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/commit.c | 39 ++++++++++++++++++++++++++++----------- 1 file changed, 28 insertions(+), 11 deletions(-) diff --git a/block/commit.c b/block/commit.c index 8dee25b313..fb54fc9560 100644 --- a/block/commit.c +++ b/block/commit.c @@ -128,6 +128,11 @@ static void commit_clean(Job *job) blk_unref(s->top); } +typedef enum CommitMethod { + COMMIT_METHOD_COPY, + COMMIT_METHOD_IGNORE, +} CommitMethod; + static int coroutine_fn commit_run(Job *job, Error **errp) { CommitBlockJob *s = container_of(job, CommitBlockJob, common.job); @@ -158,8 +163,8 @@ static int coroutine_fn commit_run(Job *job, Error **errp) buf = blk_blockalign(s->top, COMMIT_BUFFER_SIZE); for (offset = 0; offset < len; offset += n) { - bool copy; bool error_in_source = true; + CommitMethod commit_method = COMMIT_METHOD_COPY; /* Note that even when no rate limit is applied we need to yield * with no pending I/O here so that bdrv_drain_all() returns. @@ -175,19 +180,31 @@ static int coroutine_fn commit_run(Job *job, Error **errp) &n, NULL, NULL, NULL); } - copy = (ret >= 0 && ret & BDRV_BLOCK_ALLOCATED); trace_commit_one_iteration(s, offset, n, ret); - if (copy) { - assert(n < SIZE_MAX); - - ret = blk_co_pread(s->top, offset, n, buf, 0); - if (ret >= 0) { - ret = blk_co_pwrite(s->base, offset, n, buf, 0); - if (ret < 0) { - error_in_source = false; + + if (ret >= 0) { + if (!(ret & BDRV_BLOCK_ALLOCATED)) { + commit_method = COMMIT_METHOD_IGNORE; + } + + switch (commit_method) { + case COMMIT_METHOD_COPY: + assert(n < SIZE_MAX); + ret = blk_co_pread(s->top, offset, n, buf, 0); + if (ret >= 0) { + ret = blk_co_pwrite(s->base, offset, n, buf, 0); + if (ret < 0) { + error_in_source = false; + } } + break; + case COMMIT_METHOD_IGNORE: + break; + default: + abort(); } } + if (ret < 0) { BlockErrorAction action = block_job_error_action(&s->common, s->on_error, @@ -202,7 +219,7 @@ static int coroutine_fn commit_run(Job *job, Error **errp) /* Publish progress */ job_progress_update(&s->common.job, n); - if (copy) { + if (commit_method == COMMIT_METHOD_COPY) { block_job_ratelimit_processed_bytes(&s->common, n); } }