btrfs: pass a btrfs_inode to btrfs_compress_heuristic()

Pass a struct btrfs_inode to btrfs_compress_heuristic() as it's an
internal interface, allowing to remove some use of BTRFS_I.

Reviewed-by: Boris Burkov <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/compression.c

···
  *
  * Return non-zero if the compression should be done, 0 otherwise.
  */
-int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end)
+int btrfs_compress_heuristic(struct btrfs_inode *inode, u64 start, u64 end)
 {
 	struct list_head *ws_list = get_workspace(0, 0);
 	struct heuristic_ws *ws;
···
 
 	ws = list_entry(ws_list, struct heuristic_ws, list);
 
-	heuristic_collect_sample(inode, start, end, ws);
+	heuristic_collect_sample(&inode->vfs_inode, start, end, ws);
 
 	if (sample_repeated_patterns(ws)) {
 		ret = 1;

fs/btrfs/compression.h

···
 const char* btrfs_compress_type2str(enum btrfs_compression_type type);
 bool btrfs_compress_is_valid_type(const char *str, size_t len);
 
-int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end);
+int btrfs_compress_heuristic(struct btrfs_inode *inode, u64 start, u64 end);
 
 int btrfs_compress_filemap_get_folio(struct address_space *mapping, u64 start,
 				     struct folio **in_folio_ret);

fs/btrfs/inode.c

···
 	if (btrfs_test_opt(fs_info, COMPRESS) ||
 	    inode->flags & BTRFS_INODE_COMPRESS ||
 	    inode->prop_compress)
-		return btrfs_compress_heuristic(&inode->vfs_inode, start, end);
+		return btrfs_compress_heuristic(inode, start, end);
 	return 0;
 }