btrfs: Make first argument of btrfs_run_delalloc_range directly an inode

Since this function is no longer a callback there is no need to have
its first argument obfuscated with a void *. Change it directly to a
pointer to an inode. No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.h

@@ -3261,7 +3261,7 @@ int btrfs_prealloc_file_range_trans(struct inode *inode,
 				    struct btrfs_trans_handle *trans, int mode,
 				    u64 start, u64 num_bytes, u64 min_size,
 				    loff_t actual_len, u64 *alloc_hint);
-int btrfs_run_delalloc_range(void *private_data, struct page *locked_page,
+int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page,
 		u64 start, u64 end, int *page_started, unsigned long *nr_written,
 		struct writeback_control *wbc);
 int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end);

fs/btrfs/inode.c

@@ -1586,11 +1586,10 @@ static inline int need_force_cow(struct inode *inode, u64 start, u64 end)
  * Function to process delayed allocation (create CoW) for ranges which are
  * being touched for the first time.
  */
-int btrfs_run_delalloc_range(void *private_data, struct page *locked_page,
+int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page,
 		u64 start, u64 end, int *page_started, unsigned long *nr_written,
 		struct writeback_control *wbc)
 {
-	struct inode *inode = private_data;
 	int ret;
 	int force_cow = need_force_cow(inode, start, end);
 	unsigned int write_flags = wbc_to_write_flags(wbc);