From a1db8733d28d615bc0daeada6c406a6dd5c5d5ef Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Mon, 14 Oct 2019 14:51:25 +0300 Subject: [PATCH] qcow2-bitmaps: fix qcow2_can_store_new_dirty_bitmap qcow2_can_store_new_dirty_bitmap works wrong, as it considers only bitmaps already stored in the qcow2 image and ignores persistent BdrvDirtyBitmap objects. So, let's instead count persistent BdrvDirtyBitmaps. We load all qcow2 bitmaps on open, so there should not be any bitmap in the image for which we don't have BdrvDirtyBitmaps version. If it is - it's a kind of corruption, and no reason to check for corruptions here (open() and close() are better places for it). Signed-off-by: Vladimir Sementsov-Ogievskiy Message-id: 20191014115126.15360-2-vsementsov@virtuozzo.com Reviewed-by: Max Reitz Cc: qemu-stable@nongnu.org Signed-off-by: Max Reitz --- block/qcow2-bitmap.c | 41 ++++++++++++++++++----------------------- 1 file changed, 18 insertions(+), 23 deletions(-) diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c index c6c8ebbe89..d41f5d049b 100644 --- a/block/qcow2-bitmap.c +++ b/block/qcow2-bitmap.c @@ -1703,8 +1703,14 @@ bool coroutine_fn qcow2_co_can_store_new_dirty_bitmap(BlockDriverState *bs, Error **errp) { BDRVQcow2State *s = bs->opaque; - bool found; - Qcow2BitmapList *bm_list; + BdrvDirtyBitmap *bitmap; + uint64_t bitmap_directory_size = 0; + uint32_t nb_bitmaps = 0; + + if (bdrv_find_dirty_bitmap(bs, name)) { + error_setg(errp, "Bitmap already exists: %s", name); + return false; + } if (s->qcow_version < 3) { /* Without autoclear_features, we would always have to assume @@ -1720,38 +1726,27 @@ bool coroutine_fn qcow2_co_can_store_new_dirty_bitmap(BlockDriverState *bs, goto fail; } - if (s->nb_bitmaps == 0) { - return true; + FOR_EACH_DIRTY_BITMAP(bs, bitmap) { + if (bdrv_dirty_bitmap_get_persistence(bitmap)) { + nb_bitmaps++; + bitmap_directory_size += + calc_dir_entry_size(strlen(bdrv_dirty_bitmap_name(bitmap)), 0); + } } + nb_bitmaps++; + bitmap_directory_size += calc_dir_entry_size(strlen(name), 0); - if (s->nb_bitmaps >= QCOW2_MAX_BITMAPS) { + if (nb_bitmaps > QCOW2_MAX_BITMAPS) { error_setg(errp, "Maximum number of persistent bitmaps is already reached"); goto fail; } - if (s->bitmap_directory_size + calc_dir_entry_size(strlen(name), 0) > - QCOW2_MAX_BITMAP_DIRECTORY_SIZE) - { + if (bitmap_directory_size > QCOW2_MAX_BITMAP_DIRECTORY_SIZE) { error_setg(errp, "Not enough space in the bitmap directory"); goto fail; } - qemu_co_mutex_lock(&s->lock); - bm_list = bitmap_list_load(bs, s->bitmap_directory_offset, - s->bitmap_directory_size, errp); - qemu_co_mutex_unlock(&s->lock); - if (bm_list == NULL) { - goto fail; - } - - found = find_bitmap_by_name(bm_list, name); - bitmap_list_free(bm_list); - if (found) { - error_setg(errp, "Bitmap with the same name is already stored"); - goto fail; - } - return true; fail: