btrfs: pass btrfs_inode to btrfs_split_delalloc_extent

The function is for internal interfaces so we should use the
btrfs_inode.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/btrfs_inode.h

@@ -477,7 +477,7 @@ void btrfs_clear_delalloc_extent(struct inode *inode,
 				 struct extent_state *state, u32 bits);
 void btrfs_merge_delalloc_extent(struct btrfs_inode *inode, struct extent_state *new,
 				 struct extent_state *other);
-void btrfs_split_delalloc_extent(struct inode *inode,
+void btrfs_split_delalloc_extent(struct btrfs_inode *inode,
 				 struct extent_state *orig, u64 split);
 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);

fs/btrfs/extent-io-tree.c

@@ -461,7 +461,7 @@ static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
 	struct rb_node **node;
 
 	if (tree->inode)
-		btrfs_split_delalloc_extent(&tree->inode->vfs_inode, orig, split);
+		btrfs_split_delalloc_extent(tree->inode, orig, split);
 
 	prealloc->start = orig->start;
 	prealloc->end = split - 1;

fs/btrfs/inode.c

@@ -2277,10 +2277,10 @@ int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page
 	return ret;
 }
 
-void btrfs_split_delalloc_extent(struct inode *inode,
+void btrfs_split_delalloc_extent(struct btrfs_inode *inode,
 				 struct extent_state *orig, u64 split)
 {
-	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+	struct btrfs_fs_info *fs_info = inode->root->fs_info;
 	u64 size;
 
 	/* not delalloc, ignore it */
@@ -2304,9 +2304,9 @@ void btrfs_split_delalloc_extent(struct inode *inode,
 			return;
 	}
 
-	spin_lock(&BTRFS_I(inode)->lock);
-	btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
-	spin_unlock(&BTRFS_I(inode)->lock);
+	spin_lock(&inode->lock);
+	btrfs_mod_outstanding_extents(inode, 1);
+	spin_unlock(&inode->lock);
 }
 
 /*