os/bluestore: remove cmake warning from extent alloc functions.

tracker link: http://tracker.ceph.com/issues/16766
Signed-off-by: Ramesh Chander <Ramesh.Chander@sandisk.com>

src/os/bluestore/Allocator.h

@@ -43,7 +43,7 @@ class Allocator {
                             uint64_t max_alloc_size, int64_t hint,
                             std::vector<AllocExtent> *extents, int *count) = 0;
 
-  virtual int alloc_extents(uint64_t want_size, uint64_t alloc_unit,
+  int alloc_extents(uint64_t want_size, uint64_t alloc_unit,
                             int64_t hint, std::vector<AllocExtent> *extents,
 			    int *count) {
     return alloc_extents(want_size, alloc_unit, want_size, hint, extents, count);

src/os/bluestore/BitAllocator.h

@@ -194,10 +194,6 @@ class BitMapArea {
   static int get_level(int64_t total_blocks);
   static int64_t get_level_factor(int level);
   virtual bool is_allocated(int64_t start_block, int64_t num_blocks) = 0;
-  virtual bool is_allocated(ExtentList *blocks, int64_t num_blocks, int blk_off) {
-    debug_assert(0);
-    return true;
-  }
   virtual bool is_exhausted() = 0;
   virtual bool child_check_n_lock(BitMapArea *child, int64_t required) {
       debug_assert(0);
@@ -322,6 +318,7 @@ class BitMapZone: public BitMapArea{
   static int64_t total_blocks;
   static void incr_count() { count++;}
   static int64_t get_total_blocks() {return total_blocks;}
+
   bool is_allocated(int64_t start_block, int64_t num_blocks);
   bool is_exhausted();
   void reset_marker();
@@ -364,6 +361,7 @@ class BitMapZone: public BitMapArea{
   }
 
   int64_t alloc_blocks(int64_t num_blocks, int64_t *start_block);
+  using BitMapArea::alloc_blocks_dis;
   int64_t alloc_blocks_dis(int64_t num_blocks,
         int64_t blk_off, ExtentList *block_list);  
   void set_blocks_used(int64_t start_block, int64_t num_blocks);
@@ -384,6 +382,8 @@ class BitMapAreaIN: public BitMapArea{
   std::mutex m_blocks_lock;
   BitMapAreaList *m_child_list;
 
+
+  using BitMapArea::is_allocated;
   virtual bool is_allocated(int64_t start_block, int64_t num_blocks);
   virtual bool is_exhausted();