btrfs: move defrag related prototypes to their own header

Now that the defrag code is all in one file, create a defrag.h and move
all the defrag related prototypes and helper out of ctree.h and into
defrag.h.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.h

@@ -773,19 +773,10 @@ int btrfs_fileattr_set(struct user_namespace *mnt_userns,
 int btrfs_ioctl_get_supported_features(void __user *arg);
 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
 int __pure btrfs_is_empty_uuid(u8 *uuid);
-int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
-		      struct btrfs_ioctl_defrag_range_args *range,
-		      u64 newer_than, unsigned long max_to_defrag);
 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
 			       struct btrfs_ioctl_balance_args *bargs);
 
 /* file.c */
-int __init btrfs_auto_defrag_init(void);
-void __cold btrfs_auto_defrag_exit(void);
-int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
-			   struct btrfs_inode *inode, u32 extent_thresh);
-int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
-void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
 extern const struct file_operations btrfs_file_operations;
 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
@@ -811,10 +802,6 @@ void btrfs_check_nocow_unlock(struct btrfs_inode *inode);
 bool btrfs_find_delalloc_in_range(struct btrfs_inode *inode, u64 start, u64 end,
 				  u64 *delalloc_start_ret, u64 *delalloc_end_ret);
 
-/* tree-defrag.c */
-int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
-			struct btrfs_root *root);
-
 /* super.c */
 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
 			unsigned long new_flags);
@@ -945,11 +932,6 @@ static inline int is_fstree(u64 rootid)
 	return 0;
 }
 
-static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
-{
-	return signal_pending(current);
-}
-
 /* verity.c */
 #ifdef CONFIG_FS_VERITY
 

fs/btrfs/defrag.c

@@ -13,6 +13,7 @@
 #include "messages.h"
 #include "delalloc-space.h"
 #include "subpage.h"
+#include "defrag.h"
 
 static struct kmem_cache *btrfs_inode_defrag_cachep;
 

fs/btrfs/defrag.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef BTRFS_DEFRAG_H
+#define BTRFS_DEFRAG_H
+
+int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
+		      struct btrfs_ioctl_defrag_range_args *range,
+		      u64 newer_than, unsigned long max_to_defrag);
+int __init btrfs_auto_defrag_init(void);
+void __cold btrfs_auto_defrag_exit(void);
+int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
+			   struct btrfs_inode *inode, u32 extent_thresh);
+int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
+void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
+int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, struct btrfs_root *root);
+
+static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
+{
+	return signal_pending(current);
+}
+
+#endif

fs/btrfs/disk-io.c

@@ -47,6 +47,7 @@
 #include "accessors.h"
 #include "extent-tree.h"
 #include "root-tree.h"
+#include "defrag.h"
 
 #define BTRFS_SUPER_FLAG_SUPP	(BTRFS_HEADER_FLAG_WRITTEN |\
 				 BTRFS_HEADER_FLAG_RELOC |\

fs/btrfs/inode.c

@@ -59,6 +59,7 @@
 #include "accessors.h"
 #include "extent-tree.h"
 #include "root-tree.h"
+#include "defrag.h"
 
 struct btrfs_iget_args {
 	u64 ino;

fs/btrfs/ioctl.c

@@ -54,6 +54,7 @@
 #include "accessors.h"
 #include "extent-tree.h"
 #include "root-tree.h"
+#include "defrag.h"
 
 #ifdef CONFIG_64BIT
 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI

fs/btrfs/super.c

@@ -52,6 +52,7 @@
 #include "raid56.h"
 #include "fs.h"
 #include "accessors.h"
+#include "defrag.h"
 #define CREATE_TRACE_POINTS
 #include <trace/events/btrfs.h>
 

fs/btrfs/transaction.c

@@ -28,6 +28,7 @@
 #include "accessors.h"
 #include "extent-tree.h"
 #include "root-tree.h"
+#include "defrag.h"
 
 static struct kmem_cache *btrfs_trans_handle_cachep;