[PATCH v5 09/22] parallels: Add a note about used bitmap in parallels_check_duplicate()

[Alexander Ivanov <alexander.ivanov@virtuozzo.com>]

In parallels_check_duplicate() We use a bitmap for duplication detection.
This bitmap is not related to used_bmap field in BDRVParallelsState. Add
a comment about it to avoid confusion.

Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
---
 block/parallels.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/block/parallels.c b/block/parallels.c
index 9056dd6a11..66990925a8 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -842,7 +842,10 @@ parallels_check_duplicate(BlockDriverState *bs, BdrvCheckResult *res,
     bool fixed = false;
 
     /*
-     * Create a bitmap of used clusters.
+     * Create a bitmap of used clusters. Please note that this bitmap is not
+     * related to used_bmap field in BDRVParallelsState and is created only for
+     * local usage.
+     *
      * If a bit is set, there is a BAT entry pointing to this cluster.
      * Loop through the BAT entries, check bits relevant to an entry offset.
      * If bit is set, this entry is duplicated. Otherwise set the bit.
-- 
2.40.1