btrfs: Sink extent_tree arguments in try_release_extent_mapping

This function already gets the page from which the two extent trees
are referenced. Simplify its signature by moving the code getting the
trees inside the function. No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -4238,13 +4238,13 @@ static int try_release_extent_state(struct extent_map_tree *map,
  * in the range corresponding to the page, both state records and extent
  * map records are removed
  */
-int try_release_extent_mapping(struct extent_map_tree *map,
-			       struct extent_io_tree *tree, struct page *page,
-			       gfp_t mask)
+int try_release_extent_mapping(struct page *page, gfp_t mask)
 {
 	struct extent_map *em;
 	u64 start = page_offset(page);
 	u64 end = start + PAGE_SIZE - 1;
+	struct extent_io_tree *tree = &BTRFS_I(page->mapping->host)->io_tree;
+	struct extent_map_tree *map = &BTRFS_I(page->mapping->host)->extent_tree;
 
 	if (gfpflags_allow_blocking(mask) &&
 	    page->mapping->host->i_size > SZ_16M) {

fs/btrfs/extent_io.h

@@ -270,9 +270,7 @@ typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
 					  int create);
 
 void extent_io_tree_init(struct extent_io_tree *tree, void *private_data);
-int try_release_extent_mapping(struct extent_map_tree *map,
-			       struct extent_io_tree *tree, struct page *page,
-			       gfp_t mask);
+int try_release_extent_mapping(struct page *page, gfp_t mask);
 int try_release_extent_buffer(struct page *page);
 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 		     struct extent_state **cached);

fs/btrfs/inode.c

@@ -8913,13 +8913,7 @@ btrfs_readpages(struct file *file, struct address_space *mapping,
 }
 static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags)
 {
-	struct extent_io_tree *tree;
-	struct extent_map_tree *map;
-	int ret;
-
-	tree = &BTRFS_I(page->mapping->host)->io_tree;
-	map = &BTRFS_I(page->mapping->host)->extent_tree;
-	ret = try_release_extent_mapping(map, tree, page, gfp_flags);
+	int ret = try_release_extent_mapping(page, gfp_flags);
 	if (ret == 1) {
 		ClearPagePrivate(page);
 		set_page_private(page, 0);