/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _FS_FUSE_DEV_H#define _FS_FUSE_DEV_H #include <linux/cleanup.h> /** Maximum number of outstanding background requests */#define FUSE_DEFAULT_MAX_BACKGROUND 12 struct fuse_conn;struct fuse_chan;struct fuse_dev;struct fuse_args;struct fuse_copy_state;struct fuse_backing_map;struct file;struct folio;enum fuse_notify_code; struct fuse_chan_param {	unsigned int minor;	unsigned int max_write;	unsigned int max_pages;	bool io_uring_enabled;}; struct fuse_chan *fuse_chan_new(void);struct fuse_chan *fuse_dev_chan_new(void);void fuse_chan_release(struct fuse_chan *fch);void fuse_chan_free(struct fuse_chan *fch);unsigned int fuse_chan_num_background(struct fuse_chan *fch);unsigned int fuse_chan_max_background(struct fuse_chan *fch);void fuse_chan_max_background_set(struct fuse_chan *fch, unsigned int val);unsigned int fuse_chan_num_waiting(struct fuse_chan *fch);void fuse_chan_set_fc(struct fuse_chan *fch, struct fuse_conn *fc);void fuse_chan_set_initialized(struct fuse_chan *fch, struct fuse_chan_param *param);ssize_t fuse_chan_send(struct fuse_chan *fch, struct fuse_args *args);int fuse_chan_send_bg(struct fuse_chan *fch, struct fuse_args *args, gfp_t gfp_flags);int fuse_chan_send_notify_reply(struct fuse_chan *fch, struct fuse_args *args, u64 unique);void fuse_chan_resend(struct fuse_chan *fch); struct fuse_forget_link *fuse_alloc_forget(void);void fuse_chan_queue_forget(struct fuse_chan *fch, struct fuse_forget_link *forget,			    u64 nodeid, u64 nlookup); DEFINE_FREE(fuse_chan_free, struct fuse_chan *, if (_T) fuse_chan_free(_T)) /** * Initialize the client device */int fuse_dev_init(void); /** * Cleanup the client device */void fuse_dev_cleanup(void); void fuse_dev_install(struct fuse_dev *fud, struct fuse_chan *fch);bool fuse_dev_verify(struct fuse_dev *fud, struct fuse_chan *fch);void fuse_dev_put(struct fuse_dev *fud);bool fuse_dev_is_installed(struct fuse_dev *fud);bool fuse_dev_is_sync_init(struct fuse_dev *fud);struct fuse_dev *fuse_dev_grab(struct file *file); void fuse_init_server_timeout(struct fuse_chan *fch, unsigned int timeout); /* Abort all requests */void fuse_chan_abort(struct fuse_chan *fch, bool abort_with_err);void fuse_chan_wait_aborted(struct fuse_chan *fch); /** * Acquire reference to fuse_conn */struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); /** * Release reference to fuse_conn */void fuse_conn_put(struct fuse_conn *fc); dev_t fuse_conn_get_id(struct fuse_conn *fc); void fuse_end_polls(struct fuse_conn *fc);int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,		unsigned int size, struct fuse_copy_state *cs); int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map);int fuse_backing_close(struct fuse_conn *fc, int backing_id); int fuse_copy_one(struct fuse_copy_state *cs, void *val, unsigned size);int fuse_copy_folio(struct fuse_copy_state *cs, struct folio **foliop,		    unsigned offset, unsigned count, int zeroing);void fuse_copy_finish(struct fuse_copy_state *cs); #ifdef CONFIG_FUSE_IO_URINGbool fuse_uring_enabled(void);void fuse_uring_destruct(struct fuse_chan *fch);#else /* CONFIG_FUSE_IO_URING */static inline bool fuse_uring_enabled(void){	return false;} static inline void fuse_uring_destruct(struct fuse_chan *fch){}#endif /* CONFIG_FUSE_IO_URING */ #endif /* _FS_FUSE_DEV_H */