diff options
Diffstat (limited to 'block/qcow2-bitmap.c')
| -rw-r--r-- | block/qcow2-bitmap.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c index 9e799996e6..8324468b16 100644 --- a/block/qcow2-bitmap.c +++ b/block/qcow2-bitmap.c @@ -269,18 +269,16 @@ static int free_bitmap_clusters(BlockDriverState *bs, Qcow2BitmapTable *tb) return 0; } -/* This function returns the number of disk sectors covered by a single qcow2 - * cluster of bitmap data. */ -static uint64_t sectors_covered_by_bitmap_cluster(const BDRVQcow2State *s, - const BdrvDirtyBitmap *bitmap) +/* Return the disk size covered by a single qcow2 cluster of bitmap data. */ +static uint64_t bytes_covered_by_bitmap_cluster(const BDRVQcow2State *s, + const BdrvDirtyBitmap *bitmap) { - uint64_t sector_granularity = - bdrv_dirty_bitmap_granularity(bitmap) >> BDRV_SECTOR_BITS; - uint64_t sbc = sector_granularity * (s->cluster_size << 3); + uint64_t granularity = bdrv_dirty_bitmap_granularity(bitmap); + uint64_t limit = granularity * (s->cluster_size << 3); - assert(QEMU_IS_ALIGNED(sbc << BDRV_SECTOR_BITS, + assert(QEMU_IS_ALIGNED(limit, bdrv_dirty_bitmap_serialization_align(bitmap))); - return sbc; + return limit; } /* load_bitmap_data @@ -293,7 +291,7 @@ static int load_bitmap_data(BlockDriverState *bs, { int ret = 0; BDRVQcow2State *s = bs->opaque; - uint64_t sector, sbc; + uint64_t sector, limit, sbc; uint64_t bm_size = bdrv_dirty_bitmap_size(bitmap); uint64_t bm_sectors = DIV_ROUND_UP(bm_size, BDRV_SECTOR_SIZE); uint8_t *buf = NULL; @@ -306,7 +304,8 @@ static int load_bitmap_data(BlockDriverState *bs, } buf = g_malloc(s->cluster_size); - sbc = sectors_covered_by_bitmap_cluster(s, bitmap); + limit = bytes_covered_by_bitmap_cluster(s, bitmap); + sbc = limit >> BDRV_SECTOR_BITS; for (i = 0, sector = 0; i < tab_size; ++i, sector += sbc) { uint64_t count = MIN(bm_sectors - sector, sbc); uint64_t entry = bitmap_table[i]; @@ -1080,7 +1079,7 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs, int ret; BDRVQcow2State *s = bs->opaque; int64_t sector; - uint64_t sbc; + uint64_t limit, sbc; uint64_t bm_size = bdrv_dirty_bitmap_size(bitmap); uint64_t bm_sectors = DIV_ROUND_UP(bm_size, BDRV_SECTOR_SIZE); const char *bm_name = bdrv_dirty_bitmap_name(bitmap); @@ -1106,8 +1105,9 @@ static uint64_t *store_bitmap_data(BlockDriverState *bs, dbi = bdrv_dirty_iter_new(bitmap, 0); buf = g_malloc(s->cluster_size); - sbc = sectors_covered_by_bitmap_cluster(s, bitmap); - assert(DIV_ROUND_UP(bm_sectors, sbc) == tb_size); + limit = bytes_covered_by_bitmap_cluster(s, bitmap); + sbc = limit >> BDRV_SECTOR_BITS; + assert(DIV_ROUND_UP(bm_size, limit) == tb_size); while ((sector = bdrv_dirty_iter_next(dbi)) != -1) { uint64_t cluster = sector / sbc; |