btrfs: export block_rsv_use_bytes

We are going to need this to move the metadata reservation stuff to
space_info.c.
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/ctree.h

@@ -2844,6 +2844,7 @@ int btrfs_block_rsv_refill(struct btrfs_root *root,
 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
 			    struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
 			    bool update_size);
+int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes);
 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
 			     struct btrfs_block_rsv *dest, u64 num_bytes,
 			     int min_factor);

fs/btrfs/extent-tree.c

@@ -53,8 +53,6 @@ static int find_next_key(struct btrfs_path *path, int level,
 static void dump_space_info(struct btrfs_fs_info *fs_info,
 			    struct btrfs_space_info *info, u64 bytes,
 			    int dump_block_groups);
-static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv,
-			       u64 num_bytes);
 
 static noinline int
 block_group_cache_done(struct btrfs_block_group_cache *cache)
@@ -5031,7 +5029,7 @@ static int reserve_metadata_bytes(struct btrfs_root *root,
 	if (ret == -ENOSPC &&
 	    unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) {
 		if (block_rsv != global_rsv &&
-		    !block_rsv_use_bytes(global_rsv, orig_bytes))
+		    !btrfs_block_rsv_use_bytes(global_rsv, orig_bytes))
 			ret = 0;
 	}
 	if (ret == -ENOSPC) {
@@ -5067,8 +5065,7 @@ static struct btrfs_block_rsv *get_block_rsv(
 	return block_rsv;
 }
 
-static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv,
-			       u64 num_bytes)
+int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes)
 {
 	int ret = -ENOSPC;
 	spin_lock(&block_rsv->lock);
@@ -5265,7 +5262,7 @@ int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src,
 {
 	int ret;
 
-	ret = block_rsv_use_bytes(src, num_bytes);
+	ret = btrfs_block_rsv_use_bytes(src, num_bytes);
 	if (ret)
 		return ret;
 
@@ -8134,7 +8131,7 @@ use_block_rsv(struct btrfs_trans_handle *trans,
 	if (unlikely(block_rsv->size == 0))
 		goto try_reserve;
 again:
-	ret = block_rsv_use_bytes(block_rsv, blocksize);
+	ret = btrfs_block_rsv_use_bytes(block_rsv, blocksize);
 	if (!ret)
 		return block_rsv;
 
@@ -8172,7 +8169,7 @@ use_block_rsv(struct btrfs_trans_handle *trans,
 	 */
 	if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL &&
 	    block_rsv->space_info == global_rsv->space_info) {
-		ret = block_rsv_use_bytes(global_rsv, blocksize);
+		ret = btrfs_block_rsv_use_bytes(global_rsv, blocksize);
 		if (!ret)
 			return global_rsv;
 	}