From 06e0a9c16405c0a4c1eca33cf286cc04c42066a2 Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Tue, 24 Aug 2021 11:38:41 +0300 Subject: [PATCH] block/copy-before-write: initialize block-copy bitmap We are going to publish copy-before-write filter to be used in separate of backup. Future step would support bitmap for the filter. But let's start from full set bitmap. We have to modify backup, as bitmap is first initialized by copy-before-write filter, and then backup modifies it. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-Id: <20210824083856.17408-20-vsementsov@virtuozzo.com> Signed-off-by: Hanna Reitz --- block/backup.c | 16 +++++++--------- block/copy-before-write.c | 4 ++++ 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/block/backup.c b/block/backup.c index 4869f1e5da..687d2882bc 100644 --- a/block/backup.c +++ b/block/backup.c @@ -233,18 +233,16 @@ static void backup_init_bcs_bitmap(BackupBlockJob *job) BdrvDirtyBitmap *bcs_bitmap = block_copy_dirty_bitmap(job->bcs); if (job->sync_mode == MIRROR_SYNC_MODE_BITMAP) { + bdrv_clear_dirty_bitmap(bcs_bitmap, NULL); ret = bdrv_dirty_bitmap_merge_internal(bcs_bitmap, job->sync_bitmap, NULL, true); assert(ret); - } else { - if (job->sync_mode == MIRROR_SYNC_MODE_TOP) { - /* - * We can't hog the coroutine to initialize this thoroughly. - * Set a flag and resume work when we are able to yield safely. - */ - block_copy_set_skip_unallocated(job->bcs, true); - } - bdrv_set_dirty_bitmap(bcs_bitmap, 0, job->len); + } else if (job->sync_mode == MIRROR_SYNC_MODE_TOP) { + /* + * We can't hog the coroutine to initialize this thoroughly. + * Set a flag and resume work when we are able to yield safely. + */ + block_copy_set_skip_unallocated(job->bcs, true); } estimate = bdrv_get_dirty_count(bcs_bitmap); diff --git a/block/copy-before-write.c b/block/copy-before-write.c index 1cefcade78..2efe098aae 100644 --- a/block/copy-before-write.c +++ b/block/copy-before-write.c @@ -147,6 +147,7 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c, static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp) { BDRVCopyBeforeWriteState *s = bs->opaque; + BdrvDirtyBitmap *copy_bitmap; bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, @@ -174,6 +175,9 @@ static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp) return -EINVAL; } + copy_bitmap = block_copy_dirty_bitmap(s->bcs); + bdrv_set_dirty_bitmap(copy_bitmap, 0, bdrv_dirty_bitmap_size(copy_bitmap)); + return 0; }