fuse_common.h

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/*  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>

  This program can be distributed under the terms of the GNU LGPLv2.
  See the file COPYING.LIB.
*/

#if !defined(FUSE_H_) && !defined(FUSE_LOWLEVEL_H_)
#error "Never include <fuse_common.h> directly; use <fuse.h> or <fuse_lowlevel.h> instead."
#endif

#ifndef FUSE_COMMON_H_
#define FUSE_COMMON_H_

#include "fuse_opt.h"
#include <stdint.h>
#include <sys/types.h>

#define FUSE_MAJOR_VERSION 3

#define FUSE_MINOR_VERSION 2

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

#ifdef __cplusplus
extern "C" {
#endif

struct fuse_file_info {
        int flags;

        unsigned int writepage : 1;

        unsigned int direct_io : 1;

        unsigned int keep_cache : 1;

        unsigned int flush : 1;

        unsigned int nonseekable : 1;

        /* Indicates that flock locks for this file should be
           released.  If set, lock_owner shall contain a valid value.
           May only be set in ->release(). */
        unsigned int flock_release : 1;

        unsigned int cache_readdir : 1;

        unsigned int padding : 26;

        uint64_t fh;

        uint64_t lock_owner;

        uint32_t poll_events;
};

struct fuse_loop_config {
        int clone_fd;

        unsigned int max_idle_threads;
};

/**************************************************************************
 * Capability bits for 'fuse_conn_info.capable' and 'fuse_conn_info.want' *
 **************************************************************************/

#define FUSE_CAP_ASYNC_READ             (1 << 0)

#define FUSE_CAP_POSIX_LOCKS            (1 << 1)

#define FUSE_CAP_ATOMIC_O_TRUNC         (1 << 3)

#define FUSE_CAP_EXPORT_SUPPORT         (1 << 4)

#define FUSE_CAP_DONT_MASK              (1 << 6)

#define FUSE_CAP_SPLICE_WRITE           (1 << 7)

#define FUSE_CAP_SPLICE_MOVE            (1 << 8)

#define FUSE_CAP_SPLICE_READ            (1 << 9)

#define FUSE_CAP_FLOCK_LOCKS            (1 << 10)

#define FUSE_CAP_IOCTL_DIR              (1 << 11)

#define FUSE_CAP_AUTO_INVAL_DATA        (1 << 12)

#define FUSE_CAP_READDIRPLUS            (1 << 13)

#define FUSE_CAP_READDIRPLUS_AUTO       (1 << 14)

#define FUSE_CAP_ASYNC_DIO              (1 << 15)

#define FUSE_CAP_WRITEBACK_CACHE        (1 << 16)

#define FUSE_CAP_NO_OPEN_SUPPORT        (1 << 17)

#define FUSE_CAP_PARALLEL_DIROPS        (1 << 18)

#define FUSE_CAP_POSIX_ACL              (1 << 19)

#define FUSE_CAP_HANDLE_KILLPRIV         (1 << 20)

#define FUSE_CAP_NO_OPENDIR_SUPPORT    (1 << 24)

#define FUSE_IOCTL_COMPAT       (1 << 0)
#define FUSE_IOCTL_UNRESTRICTED (1 << 1)
#define FUSE_IOCTL_RETRY        (1 << 2)
#define FUSE_IOCTL_DIR          (1 << 4)

#define FUSE_IOCTL_MAX_IOV      256

struct fuse_conn_info {
        unsigned proto_major;

        unsigned proto_minor;

        unsigned max_write;

        unsigned max_read;

        unsigned max_readahead;

        unsigned capable;

        unsigned want;

        unsigned max_background;

        unsigned congestion_threshold;

        unsigned time_gran;

        unsigned reserved[22];
};

struct fuse_session;
struct fuse_pollhandle;
struct fuse_conn_info_opts;

struct fuse_conn_info_opts* fuse_parse_conn_info_opts(struct fuse_args *args);

void fuse_apply_conn_info_opts(struct fuse_conn_info_opts *opts,
                          struct fuse_conn_info *conn);

int fuse_daemonize(int foreground);

int fuse_version(void);

const char *fuse_pkgversion(void);

void fuse_pollhandle_destroy(struct fuse_pollhandle *ph);

/* ----------------------------------------------------------- *
 * Data buffer                                                 *
 * ----------------------------------------------------------- */

enum fuse_buf_flags {
        FUSE_BUF_IS_FD          = (1 << 1),

        FUSE_BUF_FD_SEEK        = (1 << 2),

        FUSE_BUF_FD_RETRY       = (1 << 3),
};

enum fuse_buf_copy_flags {
        FUSE_BUF_NO_SPLICE      = (1 << 1),

        FUSE_BUF_FORCE_SPLICE   = (1 << 2),

        FUSE_BUF_SPLICE_MOVE    = (1 << 3),

        FUSE_BUF_SPLICE_NONBLOCK= (1 << 4),
};

struct fuse_buf {
        size_t size;

        enum fuse_buf_flags flags;

        void *mem;

        int fd;

        off_t pos;
};

struct fuse_bufvec {
        size_t count;

        size_t idx;

        size_t off;

        struct fuse_buf buf[1];
};

/* Initialize bufvec with a single buffer of given size */
#define FUSE_BUFVEC_INIT(size__)                                \
        ((struct fuse_bufvec) {                                 \
                /* .count= */ 1,                                \
                /* .idx =  */ 0,                                \
                /* .off =  */ 0,                                \
                /* .buf =  */ { /* [0] = */ {                   \
                        /* .size =  */ (size__),                \
                        /* .flags = */ (enum fuse_buf_flags) 0, \
                        /* .mem =   */ NULL,                    \
                        /* .fd =    */ -1,                      \
                        /* .pos =   */ 0,                       \
                } }                                             \
        } )

size_t fuse_buf_size(const struct fuse_bufvec *bufv);

ssize_t fuse_buf_copy(struct fuse_bufvec *dst, struct fuse_bufvec *src,
                      enum fuse_buf_copy_flags flags);

/* ----------------------------------------------------------- *
 * Signal handling                                             *
 * ----------------------------------------------------------- */

int fuse_set_signal_handlers(struct fuse_session *se);

void fuse_remove_signal_handlers(struct fuse_session *se);

/* ----------------------------------------------------------- *
 * Compatibility stuff                                         *
 * ----------------------------------------------------------- */

#if !defined(FUSE_USE_VERSION) || FUSE_USE_VERSION < 30
#  error only API version 30 or greater is supported
#endif

#ifdef __cplusplus
}
#endif


/*
 * This interface uses 64 bit off_t.
 *
 * On 32bit systems please add -D_FILE_OFFSET_BITS=64 to your compile flags!
 */

#if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 6) && !defined __cplusplus
_Static_assert(sizeof(off_t) == 8, "fuse: off_t must be 64bit");
#else
struct _fuse_off_t_must_be_64bit_dummy_struct \
        { unsigned _fuse_off_t_must_be_64bit:((sizeof(off_t) == 8) ? 1 : -1); };
#endif

#endif /* FUSE_COMMON_H_ */