From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59779) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eR2eN-0001s0-0S for qemu-devel@nongnu.org; Mon, 18 Dec 2017 16:08:40 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eR2eL-0003M3-Ua for qemu-devel@nongnu.org; Mon, 18 Dec 2017 16:08:38 -0500 From: Jeff Cody Date: Mon, 18 Dec 2017 16:08:12 -0500 Message-Id: <20171218210819.31576-4-jcody@redhat.com> In-Reply-To: <20171218210819.31576-1-jcody@redhat.com> References: <20171218210819.31576-1-jcody@redhat.com> Subject: [Qemu-devel] [PULL 03/10] backup: init copy_bitmap from sync_bitmap for incremental List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: peter.maydell@linaro.org, jcody@redhat.com, vsementsov@virtuozzo.com, jsnow@redhat.com, qemu-devel@nongnu.org From: Vladimir Sementsov-Ogievskiy We should not copy non-dirty clusters in write notifiers. So, initialize copy_bitmap from sync_bitmap. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: John Snow Reviewed-by: Jeff Cody Reviewed-by: Stefan Hajnoczi Message-id: 20171012135313.227864-4-vsementsov@virtuozzo.com Signed-off-by: Jeff Cody --- block/backup.c | 44 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 43 insertions(+), 1 deletion(-) diff --git a/block/backup.c b/block/backup.c index 5175808..b8901ea 100644 --- a/block/backup.c +++ b/block/backup.c @@ -422,6 +422,43 @@ out: return ret; } +/* init copy_bitmap from sync_bitmap */ +static void backup_incremental_init_copy_bitmap(BackupBlockJob *job) +{ + BdrvDirtyBitmapIter *dbi; + int64_t offset; + int64_t end = DIV_ROUND_UP(bdrv_dirty_bitmap_size(job->sync_bitmap), + job->cluster_size); + + dbi = bdrv_dirty_iter_new(job->sync_bitmap); + while ((offset = bdrv_dirty_iter_next(dbi)) != -1) { + int64_t cluster = offset / job->cluster_size; + int64_t next_cluster; + + offset += bdrv_dirty_bitmap_granularity(job->sync_bitmap); + if (offset >= bdrv_dirty_bitmap_size(job->sync_bitmap)) { + hbitmap_set(job->copy_bitmap, cluster, end - cluster); + break; + } + + offset = bdrv_dirty_bitmap_next_zero(job->sync_bitmap, offset); + if (offset == -1) { + hbitmap_set(job->copy_bitmap, cluster, end - cluster); + break; + } + + next_cluster = DIV_ROUND_UP(offset, job->cluster_size); + hbitmap_set(job->copy_bitmap, cluster, next_cluster - cluster); + if (next_cluster >= end) { + break; + } + + bdrv_set_dirty_iter(dbi, next_cluster * job->cluster_size); + } + + bdrv_dirty_iter_free(dbi); +} + static void coroutine_fn backup_run(void *opaque) { BackupBlockJob *job = opaque; @@ -435,7 +472,12 @@ static void coroutine_fn backup_run(void *opaque) nb_clusters = DIV_ROUND_UP(job->common.len, job->cluster_size); job->copy_bitmap = hbitmap_alloc(nb_clusters, 0); - hbitmap_set(job->copy_bitmap, 0, nb_clusters); + if (job->sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) { + backup_incremental_init_copy_bitmap(job); + } else { + hbitmap_set(job->copy_bitmap, 0, nb_clusters); + } + job->before_write.notify = backup_before_write_notify; bdrv_add_before_write_notifier(bs, &job->before_write); -- 2.9.5