fuse: clean up fuse_req

/** Number of dentries for each connection in the control filesystem */

#define FUSE_CTL_NUM_DENTRIES 5

/** Number of page pointers embedded in fuse_req */

#define FUSE_REQ_INLINE_PAGES 1

/** List of active connections */

extern struct list_head fuse_conn_list;

	/** Used to wake up the task waiting for completion of request*/

	wait_queue_head_t waitq;

	/** Data for asynchronous requests */

	union {

		struct {

			struct fuse_release_in in;

			struct inode *inode;

		} release;

		struct fuse_init_in init_in;

		struct fuse_init_out init_out;

		struct cuse_init_in cuse_init_in;

		struct {

			struct fuse_read_in in;

			u64 attr_ver;

		} read;

		struct {

			struct fuse_write_in in;

			struct fuse_write_out out;

			struct fuse_req *next;

		} write;

		struct fuse_notify_retrieve_in retrieve_in;

	} misc;

	/** page vector */

	struct page **pages;

	/** page-descriptor vector */

	struct fuse_page_desc *page_descs;

	/** size of the 'pages' array */

	unsigned max_pages;

	/** inline page vector */

	struct page *inline_pages[FUSE_REQ_INLINE_PAGES];

	/** inline page-descriptor vector */

	struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];

	/** number of pages in vector */

	unsigned num_pages;

	/** File used in the request (or NULL) */

	struct fuse_file *ff;

	/** Inode used in the request or NULL */

	struct inode *inode;

	/** AIO control block */

	struct fuse_io_priv *io;

	/** Link on fi->writepages */

	struct list_head writepages_entry;

	/** Request completion callback */

	void (*end)(struct fuse_conn *, struct fuse_req *);