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qcow2: Tweak comments on qcow2_get_persistent_dirty_bitmap_size

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For now, we don't have persistent bitmaps in any other formats, but
that might not be true in the future.  Make it obvious that our
incoming parameter is not necessarily a qcow2 image, and therefore is
limited to just the bdrv_dirty_bitmap_* API calls (rather than probing
into qcow2 internals).

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200608190821.3293867-1-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2020-06-08 14:08:21 -05:00 committed by Kevin Wolf
parent e37adbebd1
commit f17d684770
1 changed files with 5 additions and 4 deletions
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9
block/qcow2-bitmap.c
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@ -1757,19 +1757,20 @@ bool qcow2_supports_persistent_dirty_bitmap(BlockDriverState *bs)
}
/*
* Compute the space required for bitmaps in @bs.
* Compute the space required to copy bitmaps from @in_bs.
*
* The computation is based as if copying to a new image with the
* given @cluster_size, which may differ from the cluster size in @bs.
* given @cluster_size, which may differ from the cluster size in
* @in_bs; in fact, @in_bs might be something other than qcow2.
*/
uint64_t qcow2_get_persistent_dirty_bitmap_size(BlockDriverState *bs,
uint64_t qcow2_get_persistent_dirty_bitmap_size(BlockDriverState *in_bs,
uint32_t cluster_size)
{
uint64_t bitmaps_size = 0;
BdrvDirtyBitmap *bm;
size_t bitmap_dir_size = 0;
FOR_EACH_DIRTY_BITMAP(bs, bm) {
FOR_EACH_DIRTY_BITMAP(in_bs, bm) {
if (bdrv_dirty_bitmap_get_persistence(bm)) {
const char *name = bdrv_dirty_bitmap_name(bm);
uint32_t granularity = bdrv_dirty_bitmap_granularity(bm);