btrfs: unexport can_overcommit

Now that we've moved all of the users to space-info.c, unexport it and
name it back to can_overcommit.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/space-info.c

@@ -182,7 +182,7 @@ static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global)
 	return (global->size << 1);
 }
 
-int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
+static int can_overcommit(struct btrfs_fs_info *fs_info,
 			  struct btrfs_space_info *space_info, u64 bytes,
 			  enum btrfs_reserve_flush_enum flush,
 			  bool system_chunk)
@@ -279,8 +279,7 @@ void btrfs_space_info_add_old_bytes(struct btrfs_fs_info *fs_info,
 		 * adding the ticket space would be a double count.
 		 */
 		if (check_overcommit &&
-		    !btrfs_can_overcommit(fs_info, space_info, 0, flush,
-					  false))
+		    !can_overcommit(fs_info, space_info, 0, flush, false))
 			break;
 		if (num_bytes >= ticket->bytes) {
 			list_del_init(&ticket->list);
@@ -724,13 +723,13 @@ btrfs_calc_reclaim_metadata_size(struct btrfs_fs_info *fs_info,
 		return to_reclaim;
 
 	to_reclaim = min_t(u64, num_online_cpus() * SZ_1M, SZ_16M);
-	if (btrfs_can_overcommit(fs_info, space_info, to_reclaim,
+	if (can_overcommit(fs_info, space_info, to_reclaim,
 			   BTRFS_RESERVE_FLUSH_ALL, system_chunk))
 		return 0;
 
 	used = btrfs_space_info_used(space_info, true);
 
-	if (btrfs_can_overcommit(fs_info, space_info, SZ_1M,
+	if (can_overcommit(fs_info, space_info, SZ_1M,
 			   BTRFS_RESERVE_FLUSH_ALL, system_chunk))
 		expected = div_factor_fine(space_info->total_bytes, 95);
 	else
@@ -978,7 +977,7 @@ static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
 		trace_btrfs_space_reservation(fs_info, "space_info",
 					      space_info->flags, orig_bytes, 1);
 		ret = 0;
-	} else if (btrfs_can_overcommit(fs_info, space_info, orig_bytes, flush,
+	} else if (can_overcommit(fs_info, space_info, orig_bytes, flush,
 				  system_chunk)) {
 		btrfs_space_info_update_bytes_may_use(fs_info, space_info,
 						      orig_bytes);

fs/btrfs/space-info.h

@@ -122,10 +122,6 @@ struct btrfs_space_info *btrfs_find_space_info(struct btrfs_fs_info *info,
 u64 btrfs_space_info_used(struct btrfs_space_info *s_info,
 			  bool may_use_included);
 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
-int btrfs_can_overcommit(struct btrfs_fs_info *fs_info,
-			 struct btrfs_space_info *space_info, u64 bytes,
-			 enum btrfs_reserve_flush_enum flush,
-			 bool system_chunk);
 void btrfs_dump_space_info(struct btrfs_fs_info *fs_info,
 			   struct btrfs_space_info *info, u64 bytes,
 			   int dump_block_groups);