btrfs: sink extent_write_locked_range tree parameter

This function is called only from submit_compressed_extents and the
io tree being passed is always that of the inode. But we are also
passing the inode, so just move getting the io tree pointer in
extent_write_locked_range to simplify the signature.
Signed-off-by: NNikolay Borisov <nborisov@suse.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -4073,11 +4073,12 @@ int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 	return ret;
 }
 
-int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
-			      u64 start, u64 end, int mode)
+int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
+			      int mode)
 {
 	int ret = 0;
 	struct address_space *mapping = inode->i_mapping;
+	struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
 	struct page *page;
 	unsigned long nr_pages = (end - start + PAGE_SIZE) >>
 		PAGE_SHIFT;

fs/btrfs/extent_io.h

@@ -405,8 +405,8 @@ int extent_invalidatepage(struct extent_io_tree *tree,
 			  struct page *page, unsigned long offset);
 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 			  struct writeback_control *wbc);
-int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
-			      u64 start, u64 end, int mode);
+int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
+			      int mode);
 int extent_writepages(struct extent_io_tree *tree,
 		      struct address_space *mapping,
 		      struct writeback_control *wbc);

fs/btrfs/inode.c

@@ -770,8 +770,8 @@ static noinline void submit_compressed_extents(struct inode *inode,
 			 * all those pages down to the drive.
 			 */
 			if (!page_started && !ret)
-				extent_write_locked_range(io_tree,
-						  inode, async_extent->start,
+				extent_write_locked_range(inode,
+						  async_extent->start,
 						  async_extent->start +
 						  async_extent->ram_size - 1,
 						  WB_SYNC_ALL);