We will need this function and a function for marking unused clusters (will
be added in the next patch) in parallels-ext.c too. Let it be a global
function parallels_mark_used().

Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
---
 block/parallels.c | 14 ++++++++------
 block/parallels.h |  3 +++
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c
index 992362ce29..ae524f1820 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -178,8 +178,8 @@ static void parallels_set_bat_entry(BDRVParallelsState *s,
     bitmap_set(s->bat_dirty_bmap, bat_entry_off(index) / s->bat_dirty_block, 1);
 }
 
-static int mark_used(BlockDriverState *bs, unsigned long *bitmap,
-                     uint32_t bitmap_size, int64_t off, uint32_t count)
+int parallels_mark_used(BlockDriverState *bs, unsigned long *bitmap,
+                        uint32_t bitmap_size, int64_t off, uint32_t count)
 {
     BDRVParallelsState *s = bs->opaque;
     uint32_t cluster_index = host_cluster_index(s, off);
@@ -232,7 +232,8 @@ static int GRAPH_RDLOCK parallels_fill_used_bitmap(BlockDriverState *bs)
             continue;
         }
 
-        err2 = mark_used(bs, s->used_bmap, s->used_bmap_size, host_off, 1);
+        err2 = parallels_mark_used(bs, s->used_bmap, s->used_bmap_size,
+                                   host_off, 1);
         if (err2 < 0 && err == 0) {
             err = err2;
         }
@@ -366,7 +367,8 @@ allocate_clusters(BlockDriverState *bs, int64_t sector_num,
         }
     }
 
-    ret = mark_used(bs, s->used_bmap, s->used_bmap_size, host_off, to_allocate);
+    ret = parallels_mark_used(bs, s->used_bmap, s->used_bmap_size,
+                              host_off, to_allocate);
     if (ret < 0) {
         /* Image consistency is broken. Alarm! */
         return ret;
@@ -827,7 +829,7 @@ parallels_check_duplicate(BlockDriverState *bs, BdrvCheckResult *res,
             continue;
         }
 
-        ret = mark_used(bs, bitmap, bitmap_size, host_off, 1);
+        ret = parallels_mark_used(bs, bitmap, bitmap_size, host_off, 1);
         assert(ret != -E2BIG);
         if (ret == 0) {
             continue;
@@ -887,7 +889,7 @@ parallels_check_duplicate(BlockDriverState *bs, BdrvCheckResult *res,
          * considered, and the bitmap size doesn't change. This specifically
          * means that -E2BIG is OK.
          */
-        ret = mark_used(bs, bitmap, bitmap_size, host_off, 1);
+        ret = parallels_mark_used(bs, bitmap, bitmap_size, host_off, 1);
         if (ret == -EBUSY) {
             res->check_errors++;
             goto out_repair_bat;
diff --git a/block/parallels.h b/block/parallels.h
index 423b2ad727..68077416b1 100644
--- a/block/parallels.h
+++ b/block/parallels.h
@@ -90,6 +90,9 @@ typedef struct BDRVParallelsState {
     Error *migration_blocker;
 } BDRVParallelsState;
 
+int parallels_mark_used(BlockDriverState *bs, unsigned long *bitmap,
+                        uint32_t bitmap_size, int64_t off, uint32_t count);
+
 int GRAPH_RDLOCK
 parallels_read_format_extension(BlockDriverState *bs, int64_t ext_off,
                                 Error **errp);
-- 
2.40.1