/*  $NetBSD: fuse.h,v 1.8 2021/09/17 08:13:06 andvar Exp $ */

/*-
 *  Copyright (c) 2010 Emmanuel Dreyfus. 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.
 * 
 *  THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 *  ``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 FOUNDATION OR CONTRIBUTORS
 *  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

#define FUSE_KERNEL_VERSION 7
#define FUSE_KERNEL_MINOR_VERSION 12
#define FUSE_ROOT_ID 1
#define FUSE_UNKNOWN_FH (uint64_t)0

#ifndef FUSE_BUFSIZE
#define FUSE_MIN_BUFSIZE ((size_t)0x21000)
#define FUSE_PREF_BUFSIZE ((size_t)(sysconf(_SC_PAGESIZE) + 0x1000))
#define FUSE_BUFSIZE MAX(FUSE_PREF_BUFSIZE /* CONSTCOND */, FUSE_MIN_BUFSIZE)
#endif /* FUSE_BUFSIZE */

/* From <linux/limits.h> */
#define LINUX_XATTR_NAME_MAX   255 
#define LINUX_XATTR_SIZE_MAX 65536
#define LINUX_XATTR_LIST_MAX 65536 

struct fuse_attr {
        uint64_t        ino;
        uint64_t        size;
        uint64_t        blocks;
        uint64_t        atime;
        uint64_t        mtime;
        uint64_t        ctime;
        uint32_t        atimensec;
        uint32_t        mtimensec;
        uint32_t        ctimensec;
        uint32_t        mode;
        uint32_t        nlink;
        uint32_t        uid;
        uint32_t        gid;
        uint32_t        rdev;
        uint32_t        blksize;
        uint32_t        padding;
};

struct fuse_kstatfs {
        uint64_t        blocks;
        uint64_t        bfree;
        uint64_t        bavail;
        uint64_t        files;
        uint64_t        ffree;
        uint32_t        bsize;
        uint32_t        namelen;
        uint32_t        frsize;
        uint32_t        padding;
        uint32_t        spare[6];
};

struct fuse_file_lock {
        uint64_t        start;
        uint64_t        end;
        uint32_t        type;
        uint32_t        pid;
};

/*
 * Various flags
 */
#define FUSE_FATTR_MODE         0x0001
#define FUSE_FATTR_UID          0x0002
#define FUSE_FATTR_GID          0x0004
#define FUSE_FATTR_SIZE         0x0008
#define FUSE_FATTR_ATIME        0x0010
#define FUSE_FATTR_MTIME        0x0020
#define FUSE_FATTR_FH           0x0040
#define FUSE_FATTR_ATIME_NOW    0x0080
#define FUSE_FATTR_MTIME_NOW    0x0100
#define FUSE_FATTR_LOCKOWNER    0x0200

#define FUSE_FOPEN_DIRECT_IO    0x0001
#define FUSE_FOPEN_KEEP_CACHE   0x0002
#define FUSE_FOPEN_NONSEEKABLE  0x0004

#define FUSE_ASYNC_READ         0x0001
#define FUSE_POSIX_LOCKS        0x0002
#define FUSE_FILE_OPS           0x0004
#define FUSE_ATOMIC_O_TRUNC     0x0008
#define FUSE_EXPORT_SUPPORT     0x0010
#define FUSE_BIG_WRITES         0x0020
#define FUSE_DONT_MASK          0x0040

#define FUSE_CUSE_UNRESTRICTED_IOCTL    0x0001

#define FUSE_RELEASE_FLUSH      0x0001

#define FUSE_GETATTR_FH         0x0001

#define FUSE_LK_FLOCK           0x0001

#define FUSE_WRITE_CACHE        0x0001
#define FUSE_WRITE_LOCKOWNER    0x0002

#define FUSE_READ_LOCKOWNER     0x0002

#define FUSE_IOCTL_COMPAT       0x0001
#define FUSE_IOCTL_UNRESTRICTED 0x0002
#define FUSE_IOCTL_RETRY        0x0004

#define FUSE_IOCTL_MAX_IOV      256

#define FUSE_POLL_SCHEDULE_NOTIFY 0x0001

enum fuse_opcode {
        FUSE_LOOKUP        = 1,
        FUSE_FORGET        = 2,
        FUSE_GETATTR       = 3,
        FUSE_SETATTR       = 4,
        FUSE_READLINK      = 5,
        FUSE_SYMLINK       = 6,
        FUSE_MKNOD         = 8,
        FUSE_MKDIR         = 9,
        FUSE_UNLINK        = 10,
        FUSE_RMDIR         = 11,
        FUSE_RENAME        = 12,
        FUSE_LINK          = 13,
        FUSE_OPEN          = 14,
        FUSE_READ          = 15,
        FUSE_WRITE         = 16,
        FUSE_STATFS        = 17,
        FUSE_RELEASE       = 18,
        FUSE_FSYNC         = 20,
        FUSE_SETXATTR      = 21,
        FUSE_GETXATTR      = 22,
        FUSE_LISTXATTR     = 23,
        FUSE_REMOVEXATTR   = 24,
        FUSE_FLUSH         = 25,
        FUSE_INIT          = 26,
        FUSE_OPENDIR       = 27,
        FUSE_READDIR       = 28,
        FUSE_RELEASEDIR    = 29,
        FUSE_FSYNCDIR      = 30,
        FUSE_GETLK         = 31,
        FUSE_SETLK         = 32,
        FUSE_SETLKW        = 33,
        FUSE_ACCESS        = 34,
        FUSE_CREATE        = 35,
        FUSE_INTERRUPT     = 36,
        FUSE_BMAP          = 37,
        FUSE_DESTROY       = 38,
        FUSE_IOCTL         = 39,
        FUSE_POLL          = 40,
        FUSE_NOTIFY_REPLY  = 41,
        FUSE_BATCH_FORGET  = 42,
        FUSE_FALLOCATE     = 43,
        FUSE_OPCODE_MAX,

        FUSE_CUSE_INIT     = 4096
};

enum fuse_notify_code {
        FUSE_NOTIFY_POLL   = 1,
        FUSE_NOTIFY_INVAL_INODE = 2,
        FUSE_NOTIFY_INVAL_ENTRY = 3,
        FUSE_NOTIFY_CODE_MAX
};

#define FUSE_MIN_READ_BUFFER 8192

#define FUSE_COMPAT_ENTRY_OUT_SIZE 120

struct fuse_entry_out {
        uint64_t        nodeid;
        uint64_t        generation;
        uint64_t        entry_valid;
        uint64_t        attr_valid;
        uint32_t        entry_valid_nsec;
        uint32_t        attr_valid_nsec;
        struct fuse_attr attr;
};

struct fuse_forget_in {
        uint64_t        nlookup;
};

struct fuse_getattr_in {
        uint32_t        getattr_flags;
        uint32_t        dummy;
        uint64_t        fh;
};

#define FUSE_COMPAT_ATTR_OUT_SIZE 96

struct fuse_attr_out {
        uint64_t        attr_valid;
        uint32_t        attr_valid_nsec;
        uint32_t        dummy;
        struct fuse_attr attr;
};

#define FUSE_COMPAT_MKNOD_IN_SIZE 8

struct fuse_mknod_in {
        uint32_t        mode;
        uint32_t        rdev;
        uint32_t        umask;
        uint32_t        padding;
};

struct fuse_mkdir_in {
        uint32_t        mode;
        uint32_t        umask;
};

struct fuse_rename_in {
        uint64_t        newdir;
};

struct fuse_link_in {
        uint64_t        oldnodeid;
};

struct fuse_setattr_in {
        uint32_t        valid;
        uint32_t        padding;
        uint64_t        fh;
        uint64_t        size;
        uint64_t        lock_owner;
        uint64_t        atime;
        uint64_t        mtime;
        uint64_t        unused2;
        uint32_t        atimensec;
        uint32_t        mtimensec;
        uint32_t        unused3;
        uint32_t        mode;
        uint32_t        unused4;
        uint32_t        uid;
        uint32_t        gid;
        uint32_t        unused5;
};

struct fuse_open_in {
        uint32_t        flags;
        uint32_t        unused;
};

struct fuse_create_in {
        uint32_t        flags;
        uint32_t        mode;
        uint32_t        umask;
        uint32_t        padding;
};

struct fuse_open_out {
        uint64_t        fh;
        uint32_t        open_flags; /* FUSE_FOPEN_ */
        uint32_t        padding;
};

struct fuse_release_in {
        uint64_t        fh;
        uint32_t        flags;
        uint32_t        release_flags;
        uint64_t        lock_owner;
};

struct fuse_flush_in {
        uint64_t        fh;
        uint32_t        unused;
        uint32_t        padding;
        uint64_t        lock_owner;
};

struct fuse_read_in {
        uint64_t        fh;
        uint64_t        offset;
        uint32_t        size;
        uint32_t        read_flags;
        uint64_t        lock_owner;
        uint32_t        flags;
        uint32_t        padding;
};

#define FUSE_COMPAT_WRITE_IN_SIZE 24

struct fuse_write_in {
        uint64_t        fh;
        uint64_t        offset;
        uint32_t        size;
        uint32_t        write_flags;
        uint64_t        lock_owner;
        uint32_t        flags;
        uint32_t        padding;
};

struct fuse_write_out {
        uint32_t        size;
        uint32_t        padding;
};

#define FUSE_COMPAT_STATFS_SIZE 48

struct fuse_statfs_out {
        struct fuse_kstatfs st;
};

struct fuse_fsync_in {
        uint64_t        fh;
        uint32_t        fsync_flags;
        uint32_t        padding;
};

struct fuse_setxattr_in {
        uint32_t        size;
        uint32_t        flags;
};

struct fuse_getxattr_in {
        uint32_t        size;
        uint32_t        padding;
};

struct fuse_getxattr_out {
        uint32_t        size;
        uint32_t        padding;
};

struct fuse_lk_in {
        uint64_t        fh;
        uint64_t        owner;
        struct fuse_file_lock lk;
        uint32_t        lk_flags;
        uint32_t        padding;
};

struct fuse_lk_out {
        struct fuse_file_lock lk;
};

struct fuse_access_in {
        uint32_t        mask;
        uint32_t        padding;
};

struct fuse_init_in {
        uint32_t        major;
        uint32_t        minor;
        uint32_t        max_readahead;
        uint32_t        flags;
};

struct fuse_init_out {
        uint32_t        major;
        uint32_t        minor;
        uint32_t        max_readahead;
        uint32_t        flags;
        uint32_t        unused;
        uint32_t        max_write;
};

#define FUSE_CUSE_INIT_INFO_MAX 4096

struct fuse_cuse_init_in {
        uint32_t        major;
        uint32_t        minor;
        uint32_t        unused;
        uint32_t        flags;
};

struct fuse_cuse_init_out {
        uint32_t        major;
        uint32_t        minor;
        uint32_t        unused;
        uint32_t        flags;
        uint32_t        max_read;
        uint32_t        max_write;
        uint32_t        dev_major;              /* chardev major */
        uint32_t        dev_minor;              /* chardev minor */
        uint32_t        spare[10];
};

struct fuse_interrupt_in {
        uint64_t        unique;
};

struct fuse_bmap_in {
        uint64_t        block;
        uint32_t        blocksize;
        uint32_t        padding;
};

struct fuse_bmap_out {
        uint64_t        block;
};

struct fuse_ioctl_in {
        uint64_t        fh;
        uint32_t        flags;
        uint32_t        cmd;
        uint64_t        arg;
        uint32_t        in_size;
        uint32_t        out_size;
};

struct fuse_ioctl_out {
        int32_t result;
        uint32_t        flags;
        uint32_t        in_iovs;
        uint32_t        out_iovs;
};

struct fuse_poll_in {
        uint64_t        fh;
        uint64_t        kh;
        uint32_t        flags;
        uint32_t   padding;
};

struct fuse_poll_out {
        uint32_t        revents;
        uint32_t        padding;
};

struct fuse_notify_poll_wakeup_out {
        uint64_t        kh;
};

struct fuse_fallocate_in {
        uint64_t        fh;
        uint64_t        offset;
        uint64_t        length;
        uint32_t        mode;
        uint32_t        padding;
};

#if 0 /* Duplicated in perfuse.h to avoid making fuse.h public */
/* Send from kernel to process */
struct fuse_in_header {
        uint32_t        len;
        uint32_t        opcode;
        uint64_t        unique;
        uint64_t        nodeid;
        uint32_t        uid;
        uint32_t        gid;
        uint32_t        pid;
        uint32_t        padding;
};

struct fuse_in_arg {
        uint32_t        size;
        const void *value;
};

struct fuse_in {
        struct          fuse_in_header h;
        uint32_t        argpages:1;     /* Req fits in a page? Always 1 */
        uint32_t        numargs;
        struct fuse_in_arg args[3];     /* args copied to userspace */
};


/* From process to kernel */
struct fuse_out_header {
        uint32_t        len;
        int32_t error;
        uint64_t        unique;
};
#endif

struct fuse_dirent {
        uint64_t        ino;
        uint64_t        off;    /* offset of next field from after foh */
        uint32_t        namelen;
        uint32_t        type;
        char name[0];
};

#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
#define FUSE_DIRENT_ALIGN(x) \
        (((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1))
#define FUSE_DIRENT_SIZE(d) \
        FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)

struct fuse_notify_inval_inode_out {
        uint64_t        ino;
        int64_t off;
        int64_t len;
};

struct fuse_notify_inval_entry_out {
        uint64_t        parent;
        uint32_t        namelen;
        uint32_t        padding;
};

#endif /* _FUSE_H */