/*-
 * SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)
 *
 * This file defines the kernel interface of FUSE
 * Copyright (C) 2001-2008  Miklos Szeredi <miklos@szeredi.hu>
 *
 * This program can be distributed under the terms of the GNU GPL.
 * See the file COPYING.
 *
 * This -- and only this -- header file may also be distributed under
 * the terms of the BSD Licence as follows:
 *
 * Copyright (C) 2001-2007 Miklos Szeredi. 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 AUTHOR 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 AUTHOR 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.
 */

/*
 * This file defines the kernel interface of FUSE
 *
 * Protocol changelog:
 *
 * 7.1:
 *  - add the following messages:
 *      FUSE_SETATTR, FUSE_SYMLINK, FUSE_MKNOD, FUSE_MKDIR, FUSE_UNLINK,
 *      FUSE_RMDIR, FUSE_RENAME, FUSE_LINK, FUSE_OPEN, FUSE_READ, FUSE_WRITE,
 *      FUSE_RELEASE, FUSE_FSYNC, FUSE_FLUSH, FUSE_SETXATTR, FUSE_GETXATTR,
 *      FUSE_LISTXATTR, FUSE_REMOVEXATTR, FUSE_OPENDIR, FUSE_READDIR,
 *      FUSE_RELEASEDIR
 *  - add padding to messages to accommodate 32-bit servers on 64-bit kernels
 *
 * 7.2:
 *  - add FOPEN_DIRECT_IO and FOPEN_KEEP_CACHE flags
 *  - add FUSE_FSYNCDIR message
 *
 * 7.3:
 *  - add FUSE_ACCESS message
 *  - add FUSE_CREATE message
 *  - add filehandle to fuse_setattr_in
 *
 * 7.4:
 *  - add frsize to fuse_kstatfs
 *  - clean up request size limit checking
 *
 * 7.5:
 *  - add flags and max_write to fuse_init_out
 *
 * 7.6:
 *  - add max_readahead to fuse_init_in and fuse_init_out
 *
 * 7.7:
 *  - add FUSE_INTERRUPT message
 *  - add POSIX file lock support
 *
 * 7.8:
 *  - add lock_owner and flags fields to fuse_release_in
 *  - add FUSE_BMAP message
 *  - add FUSE_DESTROY message
 *
 * 7.9:
 *  - new fuse_getattr_in input argument of GETATTR
 *  - add lk_flags in fuse_lk_in
 *  - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
 *  - add blksize field to fuse_attr
 *  - add file flags field to fuse_read_in and fuse_write_in
 *  - Add ATIME_NOW and MTIME_NOW flags to fuse_setattr_in
 *
 * 7.10
 *  - add nonseekable open flag
 *
 * 7.11
 *  - add IOCTL message
 *  - add unsolicited notification support
 *  - add POLL message and NOTIFY_POLL notification
 *
 * 7.12
 *  - add umask flag to input argument of create, mknod and mkdir
 *  - add notification messages for invalidation of inodes and
 *    directory entries
 *
 * 7.13
 *  - make max number of background requests and congestion threshold
 *    tunables
 *
 * 7.14
 *  - add splice support to fuse device
 *
 * 7.15
 *  - add store notify
 *  - add retrieve notify
 *
 * 7.16
 *  - add BATCH_FORGET request
 *  - FUSE_IOCTL_UNRESTRICTED shall now return with array of 'struct
 *    fuse_ioctl_iovec' instead of ambiguous 'struct iovec'
 *  - add FUSE_IOCTL_32BIT flag
 *
 * 7.17
 *  - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK
 *
 * 7.18
 *  - add FUSE_IOCTL_DIR flag
 *  - add FUSE_NOTIFY_DELETE
 *
 * 7.19
 *  - add FUSE_FALLOCATE
 *
 * 7.20
 *  - add FUSE_AUTO_INVAL_DATA
 *
 * 7.21
 *  - add FUSE_READDIRPLUS
 *  - send the requested events in POLL request
 *
 * 7.22
 *  - add FUSE_ASYNC_DIO
 *
 * 7.23
 *  - add FUSE_WRITEBACK_CACHE
 *  - add time_gran to fuse_init_out
 *  - add reserved space to fuse_init_out
 *  - add FATTR_CTIME
 *  - add ctime and ctimensec to fuse_setattr_in
 *  - add FUSE_RENAME2 request
 *  - add FUSE_NO_OPEN_SUPPORT flag
 *
 *  7.24
 *  - add FUSE_LSEEK for SEEK_HOLE and SEEK_DATA support
 *
 *  7.25
 *  - add FUSE_PARALLEL_DIROPS
 *
 *  7.26
 *  - add FUSE_HANDLE_KILLPRIV
 *  - add FUSE_POSIX_ACL
 *
 *  7.27
 *  - add FUSE_ABORT_ERROR
 *
 *  7.28
 *  - add FUSE_COPY_FILE_RANGE
 *  - add FOPEN_CACHE_DIR
 *  - add FUSE_MAX_PAGES, add max_pages to init_out
 *  - add FUSE_CACHE_SYMLINKS
 *
 *  7.29
 *  - add FUSE_NO_OPENDIR_SUPPORT flag
 *
 *  7.30
 *  - add FUSE_EXPLICIT_INVAL_DATA
 *  - add FUSE_IOCTL_COMPAT_X32
 *
 *  7.31
 *  - add FUSE_WRITE_KILL_PRIV flag
 *  - add FUSE_SETUPMAPPING and FUSE_REMOVEMAPPING
 *  - add map_alignment to fuse_init_out, add FUSE_MAP_ALIGNMENT flag
 *
 *  7.32
 *  - add flags to fuse_attr, add FUSE_ATTR_SUBMOUNT, add FUSE_SUBMOUNTS
 *
 *  7.33
 *  - add FUSE_HANDLE_KILLPRIV_V2, FUSE_WRITE_KILL_SUIDGID, FATTR_KILL_SUIDGID
 *  - add FUSE_OPEN_KILL_SUIDGID
 *  - extend fuse_setxattr_in, add FUSE_SETXATTR_EXT
 *  - add FUSE_SETXATTR_ACL_KILL_SGID
 *
 *  7.34
 *  - add FUSE_SYNCFS
 *
 *  7.35
 *  - add FOPEN_NOFLUSH
 */

#ifndef _FUSE_FUSE_KERNEL_H
#define _FUSE_FUSE_KERNEL_H

#ifdef __linux__
#include <linux/types.h>
#else
#include <sys/types.h>
#endif

/*
 * Version negotiation:
 *
 * Both the kernel and userspace send the version they support in the
 * INIT request and reply respectively.
 *
 * If the major versions match then both shall use the smallest
 * of the two minor versions for communication.
 *
 * If the kernel supports a larger major version, then userspace shall
 * reply with the major version it supports, ignore the rest of the
 * INIT message and expect a new INIT message from the kernel with a
 * matching major version.
 *
 * If the library supports a larger major version, then it shall fall
 * back to the major protocol version sent by the kernel for
 * communication and reply with that major version (and an arbitrary
 * supported minor version).
 */

/** Version number of this interface */
#define FUSE_KERNEL_VERSION 7

/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 35

/** The node ID of the root inode */
#define FUSE_ROOT_ID 1

/* Make sure all structures are padded to 64bit boundary, so 32bit
   userspace works under 64bit kernels */

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        flags;
};

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; /* tgid */
};

/**
 * Bitmasks for fuse_setattr_in.valid
 */
#define FATTR_MODE      (1 << 0)
#define FATTR_UID       (1 << 1)
#define FATTR_GID       (1 << 2)
#define FATTR_SIZE      (1 << 3)
#define FATTR_ATIME     (1 << 4)
#define FATTR_MTIME     (1 << 5)
#define FATTR_FH        (1 << 6)
#define FATTR_ATIME_NOW (1 << 7)
#define FATTR_MTIME_NOW (1 << 8)
#define FATTR_LOCKOWNER (1 << 9)
#define FATTR_CTIME     (1 << 10)
#define FATTR_KILL_SUIDGID (1 << 11)

/**
 * Flags returned by the OPEN request
 *
 * FOPEN_DIRECT_IO: bypass page cache for this open file
 * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
 * FOPEN_NONSEEKABLE: the file is not seekable
 * FOPEN_CACHE_DIR: allow caching this directory
 * FOPEN_STREAM: the file is stream-like (no file position at all)
 * FOPEN_NOFLUSH: don't flush data cache on close (unless FUSE_WRITEBACK_CACHE)
 */
#define FOPEN_DIRECT_IO         (1 << 0)
#define FOPEN_KEEP_CACHE        (1 << 1)
#define FOPEN_NONSEEKABLE       (1 << 2)
#define FOPEN_CACHE_DIR         (1 << 3)
#define FOPEN_STREAM            (1 << 4)
#define FOPEN_NOFLUSH           (1 << 5)

/**
 * INIT request/reply flags
 *
 * FUSE_ASYNC_READ: asynchronous read requests
 * FUSE_POSIX_LOCKS: remote locking for POSIX file locks
 * FUSE_FILE_OPS: kernel sends file handle for fstat, etc... (not yet supported)
 * FUSE_ATOMIC_O_TRUNC: handles the O_TRUNC open flag in the filesystem
 * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
 * FUSE_BIG_WRITES: filesystem can handle write size larger than 4kB
 * FUSE_DONT_MASK: don't apply umask to file mode on create operations
 * FUSE_SPLICE_WRITE: kernel supports splice write on the device
 * FUSE_SPLICE_MOVE: kernel supports splice move on the device
 * FUSE_SPLICE_READ: kernel supports splice read on the device
 * FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
 * FUSE_HAS_IOCTL_DIR: kernel supports ioctl on directories
 * FUSE_AUTO_INVAL_DATA: automatically invalidate cached pages
 * FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one)
 * FUSE_READDIRPLUS_AUTO: adaptive readdirplus
 * FUSE_ASYNC_DIO: asynchronous direct I/O submission
 * FUSE_WRITEBACK_CACHE: use writeback cache for buffered writes
 * FUSE_NO_OPEN_SUPPORT: kernel supports zero-message opens
 * FUSE_PARALLEL_DIROPS: allow parallel lookups and readdir
 * FUSE_HANDLE_KILLPRIV: fs handles killing suid/sgid/cap on write/chown/trunc
 * FUSE_POSIX_ACL: filesystem supports posix acls
 * FUSE_ABORT_ERROR: reading the device after abort returns ECONNABORTED
 * FUSE_MAX_PAGES: init_out.max_pages contains the max number of req pages
 * FUSE_CACHE_SYMLINKS: cache READLINK responses
 * FUSE_NO_OPENDIR_SUPPORT: kernel supports zero-message opendir
 * FUSE_EXPLICIT_INVAL_DATA: only invalidate cached pages on explicit request
 * FUSE_MAP_ALIGNMENT: init_out.map_alignment contains log2(byte alignment) for
 *                     foffset and moffset fields in struct
 *                     fuse_setupmapping_out and fuse_removemapping_one.
 * FUSE_SUBMOUNTS: kernel supports auto-mounting directory submounts
 * FUSE_HANDLE_KILLPRIV_V2: fs kills suid/sgid/cap on write/chown/trunc.
 *                      Upon write/truncate suid/sgid is only killed if caller
 *                      does not have CAP_FSETID. Additionally upon
 *                      write/truncate sgid is killed only if file has group
 *                      execute permission. (Same as Linux VFS behavior).
 * FUSE_SETXATTR_EXT:   Server supports extended struct fuse_setxattr_in
 */
#define FUSE_ASYNC_READ         (1 << 0)
#define FUSE_POSIX_LOCKS        (1 << 1)
#define FUSE_FILE_OPS           (1 << 2)
#define FUSE_ATOMIC_O_TRUNC     (1 << 3)
#define FUSE_EXPORT_SUPPORT     (1 << 4)
#define FUSE_BIG_WRITES         (1 << 5)
#define FUSE_DONT_MASK          (1 << 6)
#define FUSE_SPLICE_WRITE       (1 << 7)
#define FUSE_SPLICE_MOVE        (1 << 8)
#define FUSE_SPLICE_READ        (1 << 9)
#define FUSE_FLOCK_LOCKS        (1 << 10)
#define FUSE_HAS_IOCTL_DIR      (1 << 11)
#define FUSE_AUTO_INVAL_DATA    (1 << 12)
#define FUSE_DO_READDIRPLUS     (1 << 13)
#define FUSE_READDIRPLUS_AUTO   (1 << 14)
#define FUSE_ASYNC_DIO          (1 << 15)
#define FUSE_WRITEBACK_CACHE    (1 << 16)
#define FUSE_NO_OPEN_SUPPORT    (1 << 17)
#define FUSE_PARALLEL_DIROPS    (1 << 18)
#define FUSE_HANDLE_KILLPRIV    (1 << 19)
#define FUSE_POSIX_ACL          (1 << 20)
#define FUSE_ABORT_ERROR        (1 << 21)
#define FUSE_MAX_PAGES          (1 << 22)
#define FUSE_CACHE_SYMLINKS     (1 << 23)
#define FUSE_NO_OPENDIR_SUPPORT (1 << 24)
#define FUSE_EXPLICIT_INVAL_DATA (1 << 25)
#define FUSE_MAP_ALIGNMENT      (1 << 26)
#define FUSE_SUBMOUNTS          (1 << 27)
#define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)
#define FUSE_SETXATTR_EXT       (1 << 29)

#ifdef linux
/**
 * CUSE INIT request/reply flags
 *
 * CUSE_UNRESTRICTED_IOCTL:  use unrestricted ioctl
 */
#define CUSE_UNRESTRICTED_IOCTL (1 << 0)
#endif /* linux */

/**
 * Release flags
 */
#define FUSE_RELEASE_FLUSH      (1 << 0)
#define FUSE_RELEASE_FLOCK_UNLOCK       (1 << 1)

/**
 * Getattr flags
 */
#define FUSE_GETATTR_FH         (1 << 0)

/**
 * Lock flags
 */
#define FUSE_LK_FLOCK           (1 << 0)

/**
 * WRITE flags
 *
 * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed
 * FUSE_WRITE_LOCKOWNER: lock_owner field is valid
 * FUSE_WRITE_KILL_SUIDGID: kill suid and sgid bits
 */
#define FUSE_WRITE_CACHE        (1 << 0)
#define FUSE_WRITE_LOCKOWNER    (1 << 1)
#define FUSE_WRITE_KILL_SUIDGID (1 << 2)

/* Obsolete alias; this flag implies killing suid/sgid only. */
#define FUSE_WRITE_KILL_PRIV    FUSE_WRITE_KILL_SUIDGID

/**
 * Read flags
 */
#define FUSE_READ_LOCKOWNER     (1 << 1)

/**
 * Ioctl flags
 *
 * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine
 * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
 * FUSE_IOCTL_RETRY: retry with new iovecs
 * FUSE_IOCTL_32BIT: 32bit ioctl
 * FUSE_IOCTL_DIR: is a directory
 * FUSE_IOCTL_COMPAT_X32: x32 compat ioctl on 64bit machine (64bit time_t)
 *
 * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
 */
#define FUSE_IOCTL_COMPAT       (1 << 0)
#define FUSE_IOCTL_UNRESTRICTED (1 << 1)
#define FUSE_IOCTL_RETRY        (1 << 2)
#define FUSE_IOCTL_32BIT        (1 << 3)
#define FUSE_IOCTL_DIR          (1 << 4)
#define FUSE_IOCTL_COMPAT_X32   (1 << 5)

#define FUSE_IOCTL_MAX_IOV      256

/**
 * Poll flags
 *
 * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
 */
#define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)

/**
 * Fsync flags
 *
 * FUSE_FSYNC_FDATASYNC: Sync data only, not metadata
 */
#define FUSE_FSYNC_FDATASYNC    (1 << 0)

/**
 * Fallocate flags.
 */
#define FUSE_FALLOC_FL_KEEP_SIZE        0x1
#define FUSE_FALLOC_FL_PUNCH_HOLE       0x2

/**
 * fuse_attr flags
 *
 * FUSE_ATTR_SUBMOUNT: Object is a submount root
 */
#define FUSE_ATTR_SUBMOUNT      (1 << 0)

/**
 * Open flags
 * FUSE_OPEN_KILL_SUIDGID: Kill suid and sgid if executable
 */
#define FUSE_OPEN_KILL_SUIDGID  (1 << 0)

/**
 * setxattr flags
 * FUSE_SETXATTR_ACL_KILL_SGID: Clear SGID when system.posix_acl_access is set
 */
#define FUSE_SETXATTR_ACL_KILL_SGID     (1 << 0)

enum fuse_opcode {
        FUSE_LOOKUP             = 1,
        FUSE_FORGET             = 2,  /* no reply */
        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_READDIRPLUS        = 44,
        FUSE_RENAME2            = 45,
        FUSE_LSEEK              = 46,
        FUSE_COPY_FILE_RANGE    = 47,
        FUSE_SETUPMAPPING       = 48,
        FUSE_REMOVEMAPPING      = 49,
        FUSE_SYNCFS             = 50,

#ifdef linux
        /* CUSE specific operations */
        CUSE_INIT               = 4096,
        /* Reserved opcodes: helpful to detect structure endian-ness */
        CUSE_INIT_BSWAP_RESERVED        = 1048576,      /* CUSE_INIT << 8 */
        FUSE_INIT_BSWAP_RESERVED        = 436207616,    /* FUSE_INIT << 24 */
#endif /* linux */
};

enum fuse_notify_code {
        FUSE_NOTIFY_POLL   = 1,
        FUSE_NOTIFY_INVAL_INODE = 2,
        FUSE_NOTIFY_INVAL_ENTRY = 3,
        FUSE_NOTIFY_STORE = 4,
        FUSE_NOTIFY_RETRIEVE = 5,
        FUSE_NOTIFY_DELETE = 6,
        FUSE_NOTIFY_CODE_MAX,
};

/* The read buffer is required to be at least 8k, but may be much larger */
#define FUSE_MIN_READ_BUFFER 8192

#define FUSE_COMPAT_ENTRY_OUT_SIZE 120

struct fuse_entry_out {
        uint64_t        nodeid;         /* Inode ID */
        uint64_t        generation;     /* Inode generation: nodeid:gen must
                                           be unique for the fs's lifetime */
        uint64_t        entry_valid;    /* Cache timeout for the name */
        uint64_t        attr_valid;     /* Cache timeout for the attributes */
        uint32_t        entry_valid_nsec;
        uint32_t        attr_valid_nsec;
        struct fuse_attr attr;
};

struct fuse_forget_in {
        uint64_t        nlookup;
};

struct fuse_forget_one {
        uint64_t        nodeid;
        uint64_t        nlookup;
};

struct fuse_batch_forget_in {
        uint32_t        count;
        uint32_t        dummy;
};

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;     /* Cache timeout for the attributes */
        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_rename2_in {
        uint64_t        newdir;
        uint32_t        flags;
        uint32_t        padding;
};

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        ctime;
        uint32_t        atimensec;
        uint32_t        mtimensec;
        uint32_t        ctimensec;
        uint32_t        mode;
        uint32_t        unused4;
        uint32_t        uid;
        uint32_t        gid;
        uint32_t        unused5;
};

struct fuse_open_in {
        uint32_t        flags;
        uint32_t        open_flags;   /* FUSE_OPEN_... */
};

struct fuse_create_in {
        uint32_t        flags;
        uint32_t        mode;
        uint32_t        umask;
        uint32_t        open_flags;   /* FUSE_OPEN_... */
};

struct fuse_open_out {
        uint64_t        fh;
        uint32_t        open_flags;
        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;
};

#define FUSE_COMPAT_SETXATTR_IN_SIZE 8

struct fuse_setxattr_in {
        uint32_t        size;
        uint32_t        flags;
        uint32_t        setxattr_flags;
        uint32_t        padding;
};

struct fuse_listxattr_in {
        uint32_t        size;
        uint32_t        padding;
};

struct fuse_listxattr_out {
        uint32_t        size;
        uint32_t        padding;
};

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;
};

#define FUSE_COMPAT_INIT_OUT_SIZE 8
#define FUSE_COMPAT_22_INIT_OUT_SIZE 24

struct fuse_init_out {
        uint32_t        major;
        uint32_t        minor;
        uint32_t        max_readahead;
        uint32_t        flags;
        uint16_t        max_background;
        uint16_t        congestion_threshold;
        uint32_t        max_write;
        uint32_t        time_gran;
        uint16_t        max_pages;
        uint16_t        map_alignment;
        uint32_t        unused[8];
};

#ifdef linux
#define CUSE_INIT_INFO_MAX 4096

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

struct 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];
};
#endif /* linux */

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_iovec {
        uint64_t        base;
        uint64_t        len;
};

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        events;
};

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;
};

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_out_header {
        uint32_t        len;
        int32_t         error;
        uint64_t        unique;
};

struct fuse_dirent {
        uint64_t        ino;
        uint64_t        off;
        uint32_t        namelen;
        uint32_t        type;
        char name[];
};

#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_direntplus {
        struct fuse_entry_out entry_out;
        struct fuse_dirent dirent;
};

#define FUSE_NAME_OFFSET_DIRENTPLUS \
        offsetof(struct fuse_direntplus, dirent.name)
#define FUSE_DIRENTPLUS_SIZE(d) \
        FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET_DIRENTPLUS + (d)->dirent.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;
};

struct fuse_notify_delete_out {
        uint64_t        parent;
        uint64_t        child;
        uint32_t        namelen;
        uint32_t        padding;
};

struct fuse_notify_store_out {
        uint64_t        nodeid;
        uint64_t        offset;
        uint32_t        size;
        uint32_t        padding;
};

struct fuse_notify_retrieve_out {
        uint64_t        notify_unique;
        uint64_t        nodeid;
        uint64_t        offset;
        uint32_t        size;
        uint32_t        padding;
};

/* Matches the size of fuse_write_in */
struct fuse_notify_retrieve_in {
        uint64_t        dummy1;
        uint64_t        offset;
        uint32_t        size;
        uint32_t        dummy2;
        uint64_t        dummy3;
        uint64_t        dummy4;
};

/* Device ioctls: */
#define FUSE_DEV_IOC_MAGIC      229
#define FUSE_DEV_IOC_CLONE      _IOR(FUSE_DEV_IOC_MAGIC, 0, uint32_t)

struct fuse_lseek_in {
        uint64_t        fh;
        uint64_t        offset;
        uint32_t        whence;
        uint32_t        padding;
};

struct fuse_lseek_out {
        uint64_t        offset;
};

struct fuse_copy_file_range_in {
        uint64_t        fh_in;
        uint64_t        off_in;
        uint64_t        nodeid_out;
        uint64_t        fh_out;
        uint64_t        off_out;
        uint64_t        len;
        uint64_t        flags;
};

#define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
#define FUSE_SETUPMAPPING_FLAG_READ (1ull << 1)
struct fuse_setupmapping_in {
        /* An already open handle */
        uint64_t        fh;
        /* Offset into the file to start the mapping */
        uint64_t        foffset;
        /* Length of mapping required */
        uint64_t        len;
        /* Flags, FUSE_SETUPMAPPING_FLAG_* */
        uint64_t        flags;
        /* Offset in Memory Window */
        uint64_t        moffset;
};

struct fuse_removemapping_in {
        /* number of fuse_removemapping_one follows */
        uint32_t        count;
};

struct fuse_removemapping_one {
        /* Offset into the dax window start the unmapping */
        uint64_t        moffset;
        /* Length of mapping required */
        uint64_t        len;
};

#define FUSE_REMOVEMAPPING_MAX_ENTRY   \
                (PAGE_SIZE / sizeof(struct fuse_removemapping_one))

struct fuse_syncfs_in {
        uint64_t        padding;
};

#endif /* _FUSE_FUSE_KERNEL_H */