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 <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20210824083856.17408-20-vsementsov@virtuozzo.com> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
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@ -233,18 +233,16 @@ static void backup_init_bcs_bitmap(BackupBlockJob *job)
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BdrvDirtyBitmap *bcs_bitmap = block_copy_dirty_bitmap(job->bcs);
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BdrvDirtyBitmap *bcs_bitmap = block_copy_dirty_bitmap(job->bcs);
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if (job->sync_mode == MIRROR_SYNC_MODE_BITMAP) {
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if (job->sync_mode == MIRROR_SYNC_MODE_BITMAP) {
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bdrv_clear_dirty_bitmap(bcs_bitmap, NULL);
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ret = bdrv_dirty_bitmap_merge_internal(bcs_bitmap, job->sync_bitmap,
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ret = bdrv_dirty_bitmap_merge_internal(bcs_bitmap, job->sync_bitmap,
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NULL, true);
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NULL, true);
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assert(ret);
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assert(ret);
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} else {
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} else if (job->sync_mode == MIRROR_SYNC_MODE_TOP) {
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if (job->sync_mode == MIRROR_SYNC_MODE_TOP) {
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/*
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/*
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* We can't hog the coroutine to initialize this thoroughly.
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* We can't hog the coroutine to initialize this thoroughly.
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* Set a flag and resume work when we are able to yield safely.
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* Set a flag and resume work when we are able to yield safely.
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*/
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*/
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block_copy_set_skip_unallocated(job->bcs, true);
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block_copy_set_skip_unallocated(job->bcs, true);
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}
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bdrv_set_dirty_bitmap(bcs_bitmap, 0, job->len);
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}
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}
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estimate = bdrv_get_dirty_count(bcs_bitmap);
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estimate = bdrv_get_dirty_count(bcs_bitmap);
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@ -147,6 +147,7 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c,
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static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp)
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static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp)
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{
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{
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BDRVCopyBeforeWriteState *s = bs->opaque;
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BDRVCopyBeforeWriteState *s = bs->opaque;
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BdrvDirtyBitmap *copy_bitmap;
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bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
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bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
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BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
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BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
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@ -174,6 +175,9 @@ static int cbw_init(BlockDriverState *bs, QDict *options, Error **errp)
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return -EINVAL;
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return -EINVAL;
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}
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}
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copy_bitmap = block_copy_dirty_bitmap(s->bcs);
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bdrv_set_dirty_bitmap(copy_bitmap, 0, bdrv_dirty_bitmap_size(copy_bitmap));
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return 0;
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return 0;
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}
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}
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