@@ -1287,9 +1287,22 @@ static int insert_into_bitmap(struct btrfs_block_group_cache *block_group,
* If we are below the extents threshold then we can add this as an
* extent, and don't have to deal with the bitmap
*/
- if (block_group->free_extents < block_group->extents_thresh &&
- info->bytes > block_group->sectorsize * 4)
- return 0;
+ if (block_group->free_extents < block_group->extents_thresh) {
+ /*
+ * If this block group has some small extents we don't want to
+ * use up all of our free slots in the cache with them, we want
+ * to reserve them to larger extents, however if we have plent
+ * of cache left then go ahead an dadd them, no sense in adding
+ * the overhead of a bitmap if we don't have to.
+ */
+ if (info->bytes <= block_group->sectorsize * 4) {
+ if (block_group->free_extents * 2 <=
+ block_group->extents_thresh)
+ return 0;
+ } else {
+ return 0;
+ }
+ }
/*
* some block groups are so tiny they can't be enveloped by a bitmap, so