xref: /src/lib/librefuse/fuse.h

/* $NetBSD: fuse.h,v 1.24 2021/12/04 06:42:39 pho Exp $ */

/*
 * Copyright  2007 Alistair Crooks.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef FUSE_H_
#define FUSE_H_	20211204

#include <sys/types.h>

#include <puffs.h>
#include <utime.h>

/* The latest version of FUSE API currently provided by refuse. */
#define FUSE_MAJOR_VERSION	2
#define FUSE_MINOR_VERSION	6

#define FUSE_MAKE_VERSION(maj, min)	((maj) * 10 + (min))
#define FUSE_VERSION	FUSE_MAKE_VERSION(FUSE_MAJOR_VERSION, FUSE_MINOR_VERSION)

/* FUSE_USE_VERSION is expected to be defined by user code to
 * determine the API to be used. Although defining this macro is
 * mandatory in the original FUSE implementation, refuse hasn't
 * required this so we only emit a warning if it's undefined. */
#if defined(FUSE_USE_VERSION)
#	if FUSE_USE_VERSION > FUSE_VERSION
#		warning "The requested API version is higher than the latest one supported by refuse."
#	endif
#else
#	warning "User code including <fuse.h> should define FUSE_USE_VERSION before including this header. Defaulting to the latest version."
#	define FUSE_USE_VERSION	FUSE_VERSION
#endif

#ifdef __cplusplus
extern "C" {
#endif

struct fuse;
struct fuse_args; /* XXXsupportme */

struct fuse_file_info {
	int32_t		flags;
	uint32_t	fh_old;
	int32_t		writepage;
	uint32_t	direct_io:1;
	uint32_t	keep_cache:1;
	uint32_t	flush:1;
	uint32_t	padding:29;
	uint64_t	fh;
	uint64_t	lock_owner;
};

struct fuse_conn_info {
	uint32_t proto_major;
	uint32_t proto_minor;
	uint32_t async_read;
	uint32_t max_write;
	uint32_t max_readahead;
	uint32_t reserved[27];
};

/* equivalent'ish of puffs_cc */
struct fuse_context {
	struct fuse	*fuse;
	uid_t		uid;
	gid_t		gid;
	pid_t		pid;
	void		*private_data;
};

/**
 * Argument list
 */
struct fuse_args {
	int	argc;
	char	**argv;
	int	allocated;
};

/**
 * Initializer for 'struct fuse_args'
 */
#define FUSE_ARGS_INIT(argc, argv) { argc, argv, 0 }

typedef struct puffs_fuse_dirh *fuse_dirh_t;

typedef int (*fuse_fill_dir_t)(void *, const char *, const struct stat *, off_t);
typedef int (*fuse_dirfil_t)(fuse_dirh_t, const char *, int, ino_t);

/*
 * These operations shadow those in puffs_usermount, and are used
 * as a table of callbacks to make when file system requests come
 * in.
 *
 * NOTE: keep same order as fuse
 */
struct fuse_operations {
	int	(*getattr)(const char *, struct stat *);
	int	(*readlink)(const char *, char *, size_t);
	int	(*getdir)(const char *, fuse_dirh_t, fuse_dirfil_t);
	int	(*mknod)(const char *, mode_t, dev_t);
	int	(*mkdir)(const char *, mode_t);
	int	(*unlink)(const char *);
	int	(*rmdir)(const char *);
	int	(*symlink)(const char *, const char *);
	int	(*rename)(const char *, const char *);
	int	(*link)(const char *, const char *);
	int	(*chmod)(const char *, mode_t);
	int	(*chown)(const char *, uid_t, gid_t);
	int	(*truncate)(const char *, off_t);
	int	(*utime)(const char *, struct utimbuf *);
	int	(*open)(const char *, struct fuse_file_info *);
	int	(*read)(const char *, char *, size_t, off_t, struct fuse_file_info *);
	int	(*write)(const char *, const char *, size_t, off_t, struct fuse_file_info *);
	int	(*statfs)(const char *, struct statvfs *);
	int	(*flush)(const char *, struct fuse_file_info *);
	int	(*release)(const char *, struct fuse_file_info *);
	int	(*fsync)(const char *, int, struct fuse_file_info *);
	int	(*setxattr)(const char *, const char *, const char *, size_t, int);
	int	(*getxattr)(const char *, const char *, char *, size_t);
	int	(*listxattr)(const char *, char *, size_t);
	int	(*removexattr)(const char *, const char *);
	int	(*opendir)(const char *, struct fuse_file_info *);
	int	(*readdir)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *);
	int	(*releasedir)(const char *, struct fuse_file_info *);
	int	(*fsyncdir)(const char *, int, struct fuse_file_info *);
	void	*(*init)(struct fuse_conn_info *);
	void	(*destroy)(void *);
	int	(*access)(const char *, int);
	int	(*create)(const char *, mode_t, struct fuse_file_info *);
	int	(*ftruncate)(const char *, off_t, struct fuse_file_info *);
	int	(*fgetattr)(const char *, struct stat *, struct fuse_file_info *);
	int	(*lock)(const char *, struct fuse_file_info *, int, struct flock *);
	int	(*utimens)(const char *, const struct timespec *);
	int	(*bmap)(const char *, size_t , uint64_t *);
};


struct fuse *fuse_new(struct fuse_args *,
	const struct fuse_operations *, size_t, void *);

int fuse_mount(struct fuse *, const char *);
void fuse_unmount(struct fuse *);

int fuse_daemonize(struct fuse *);

int fuse_main_real(int, char **, const struct fuse_operations *, size_t, void *);
int fuse_loop(struct fuse *);
struct fuse_context *fuse_get_context(void);
void fuse_exit(struct fuse *);
void fuse_destroy(struct fuse *);
int fuse_version(void);

#if FUSE_USE_VERSION == 22
#define fuse_unmount fuse_unmount_compat22
#endif

void fuse_unmount_compat22(const char *);

#if FUSE_USE_VERSION >= 26
#define fuse_main(argc, argv, op, user_data) \
            fuse_main_real(argc, argv, op, sizeof(*(op)), user_data)
#else
#define fuse_main(argc, argv, op) \
            fuse_main_real(argc, argv, op, sizeof(*(op)), NULL)
#endif

#ifdef __cplusplus
}
#endif

#include <fuse_opt.h>

#endif