diff --git a/fs/btrfs/block-rsv.h b/fs/btrfs/block-rsv.h
new file mode 100644
index 000000000000..13f5ab02a635
--- /dev/null
+++ b/fs/btrfs/block-rsv.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 Facebook.  All rights reserved.
+ */
+
+#ifndef BTRFS_BLOCK_RSV_H
+#define BTRFS_BLOCK_RSV_H
+
+
+enum btrfs_reserve_flush_enum;
+
+/*
+ * Types of block reserves
+ */
+enum {
+	BTRFS_BLOCK_RSV_GLOBAL,
+	BTRFS_BLOCK_RSV_DELALLOC,
+	BTRFS_BLOCK_RSV_TRANS,
+	BTRFS_BLOCK_RSV_CHUNK,
+	BTRFS_BLOCK_RSV_DELOPS,
+	BTRFS_BLOCK_RSV_DELREFS,
+	BTRFS_BLOCK_RSV_EMPTY,
+	BTRFS_BLOCK_RSV_TEMP,
+};
+
+struct btrfs_block_rsv {
+	u64 size;
+	u64 reserved;
+	struct btrfs_space_info *space_info;
+	spinlock_t lock;
+	unsigned short full;
+	unsigned short type;
+	unsigned short failfast;
+
+	/*
+	 * Qgroup equivalent for @size @reserved
+	 *
+	 * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
+	 * about things like csum size nor how many tree blocks it will need to
+	 * reserve.
+	 *
+	 * Qgroup cares more about net change of the extent usage.
+	 *
+	 * So for one newly inserted file extent, in worst case it will cause
+	 * leaf split and level increase, nodesize for each file extent is
+	 * already too much.
+	 *
+	 * In short, qgroup_size/reserved is the upper limit of possible needed
+	 * qgroup metadata reservation.
+	 */
+	u64 qgroup_rsv_size;
+	u64 qgroup_rsv_reserved;
+};
+
+void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
+struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
+					      unsigned short type);
+void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
+				   struct btrfs_block_rsv *rsv,
+				   unsigned short type);
+void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
+			  struct btrfs_block_rsv *rsv);
+int btrfs_block_rsv_add(struct btrfs_root *root,
+			struct btrfs_block_rsv *block_rsv, u64 num_bytes,
+			enum btrfs_reserve_flush_enum flush);
+int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
+int btrfs_block_rsv_refill(struct btrfs_root *root,
+			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,
+			   enum btrfs_reserve_flush_enum flush);
+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);
+void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
+			     struct btrfs_block_rsv *block_rsv,
+			     u64 num_bytes);
+#endif /* BTRFS_BLOCK_RSV_H */
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 2aeb323cc86e..9b8b8d07e66f 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -32,6 +32,7 @@
 #include "extent_io.h"
 #include "extent_map.h"
 #include "async-thread.h"
+#include "block-rsv.h"
 
 struct btrfs_trans_handle;
 struct btrfs_transaction;
@@ -394,49 +395,6 @@ struct raid_kobject {
 	struct list_head list;
 };
 
-/*
- * Types of block reserves
- */
-enum {
-	BTRFS_BLOCK_RSV_GLOBAL,
-	BTRFS_BLOCK_RSV_DELALLOC,
-	BTRFS_BLOCK_RSV_TRANS,
-	BTRFS_BLOCK_RSV_CHUNK,
-	BTRFS_BLOCK_RSV_DELOPS,
-	BTRFS_BLOCK_RSV_DELREFS,
-	BTRFS_BLOCK_RSV_EMPTY,
-	BTRFS_BLOCK_RSV_TEMP,
-};
-
-struct btrfs_block_rsv {
-	u64 size;
-	u64 reserved;
-	struct btrfs_space_info *space_info;
-	spinlock_t lock;
-	unsigned short full;
-	unsigned short type;
-	unsigned short failfast;
-
-	/*
-	 * Qgroup equivalent for @size @reserved
-	 *
-	 * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
-	 * about things like csum size nor how many tree blocks it will need to
-	 * reserve.
-	 *
-	 * Qgroup cares more about net change of the extent usage.
-	 *
-	 * So for one newly inserted file extent, in worst case it will cause
-	 * leaf split and level increase, nodesize for each file extent is
-	 * already too much.
-	 *
-	 * In short, qgroup_size/reserved is the upper limit of possible needed
-	 * qgroup metadata reservation.
-	 */
-	u64 qgroup_rsv_size;
-	u64 qgroup_rsv_reserved;
-};
-
 /*
  * free clusters are used to claim free space in relatively large chunks,
  * allowing us to do less seeky writes. They are used for all metadata
@@ -2810,32 +2768,6 @@ void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes,
 				     bool qgroup_free);
 int btrfs_delalloc_reserve_space(struct inode *inode,
 			struct extent_changeset **reserved, u64 start, u64 len);
-void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
-struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
-					      unsigned short type);
-void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
-				   struct btrfs_block_rsv *rsv,
-				   unsigned short type);
-void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
-			  struct btrfs_block_rsv *rsv);
-int btrfs_block_rsv_add(struct btrfs_root *root,
-			struct btrfs_block_rsv *block_rsv, u64 num_bytes,
-			enum btrfs_reserve_flush_enum flush);
-int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
-int btrfs_block_rsv_refill(struct btrfs_root *root,
-			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,
-			   enum btrfs_reserve_flush_enum flush);
-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);
-void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
-			     struct btrfs_block_rsv *block_rsv,
-			     u64 num_bytes);
 void btrfs_delayed_refs_rsv_release(struct btrfs_fs_info *fs_info, int nr);
 void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle *trans);
 int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 3fc140dfcc58..2e128ecc95f7 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -29,6 +29,7 @@
 #include "qgroup.h"
 #include "ref-verify.h"
 #include "space-info.h"
+#include "block-rsv.h"
 
 #undef SCRAMBLE_DELAYED_REFS
 
