Now that we have adjusted the majority of the calls this function
makes to be byte-based, it is easier to read the code if it makes
passes over the image using bytes rather than sectors.
Signed-off-by: Eric Blake <ebl...@redhat.com>
---
v4: new patch
---
block/qcow2-bitmap.c | 22 ++++++++--------------
1 file changed, 8 insertions(+), 14 deletions(-)
diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 280960a..1de2ab5 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -291,9 +291,8 @@ static int load_bitmap_data(BlockDriverState *bs,
{
int ret = 0;
BDRVQcow2State *s = bs->opaque;
- uint64_t sector, limit, sbc;
+ uint64_t offset, limit;
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;
uint64_t i, tab_size =
size_to_clusters(s,
@@ -305,32 +304,27 @@ static int load_bitmap_data(BlockDriverState *bs,
buf = g_malloc(s->cluster_size);
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);
+ for (i = 0, offset = 0; i < tab_size; ++i, offset += limit) {
+ uint64_t count = MIN(bm_size - offset, limit);
uint64_t entry = bitmap_table[i];
- uint64_t offset = entry & BME_TABLE_ENTRY_OFFSET_MASK;
+ uint64_t data_offset = entry & BME_TABLE_ENTRY_OFFSET_MASK;
assert(check_table_entry(entry, s->cluster_size) == 0);
- if (offset == 0) {
+ if (data_offset == 0) {
if (entry & BME_TABLE_ENTRY_FLAG_ALL_ONES) {
- bdrv_dirty_bitmap_deserialize_ones(bitmap,
- sector * BDRV_SECTOR_SIZE,
- count * BDRV_SECTOR_SIZE,
+ bdrv_dirty_bitmap_deserialize_ones(bitmap, offset, count,
false);
} else {
/* No need to deserialize zeros because the dirty bitmap is
* already cleared */
}
} else {
- ret = bdrv_pread(bs->file, offset, buf, s->cluster_size);
+ ret = bdrv_pread(bs->file, data_offset, buf, s->cluster_size);
if (ret < 0) {
goto finish;
}
- bdrv_dirty_bitmap_deserialize_part(bitmap, buf,
- sector * BDRV_SECTOR_SIZE,
- count * BDRV_SECTOR_SIZE,
+ bdrv_dirty_bitmap_deserialize_part(bitmap, buf, offset, count,
false);
}
}
--
2.9.4
