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/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) */

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This file defines the kernel interface of FUSE

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This program can be distributed under the terms of the GNU GPL.

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See the file COPYING.

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This -- and only this -- header file may also be distributed under

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the terms of the BSD Licence as follows:

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Redistribution and use in source and binary forms, with or without

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modification, are permitted provided that the following conditions

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are met:

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1. Redistributions of source code must retain the above copyright

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notice, this list of conditions and the following disclaimer.

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2. Redistributions in binary form must reproduce the above copyright

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notice, this list of conditions and the following disclaimer in the

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documentation and/or other materials provided with the distribution.

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THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE

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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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SUCH DAMAGE.

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* This file defines the kernel interface of FUSE

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* Protocol changelog:

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* 7.1:

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* - add the following messages:

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* FUSE_SETATTR, FUSE_SYMLINK, FUSE_MKNOD, FUSE_MKDIR, FUSE_UNLINK,

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* FUSE_RMDIR, FUSE_RENAME, FUSE_LINK, FUSE_OPEN, FUSE_READ, FUSE_WRITE,

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* FUSE_RELEASE, FUSE_FSYNC, FUSE_FLUSH, FUSE_SETXATTR, FUSE_GETXATTR,

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* FUSE_LISTXATTR, FUSE_REMOVEXATTR, FUSE_OPENDIR, FUSE_READDIR,

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* FUSE_RELEASEDIR

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* - add padding to messages to accommodate 32-bit servers on 64-bit kernels

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* 7.2:

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* - add FOPEN_DIRECT_IO and FOPEN_KEEP_CACHE flags

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* - add FUSE_FSYNCDIR message

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* 7.3:

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* - add FUSE_ACCESS message

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* - add FUSE_CREATE message

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* - add filehandle to fuse_setattr_in

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* 7.4:

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* - add frsize to fuse_kstatfs

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* - clean up request size limit checking

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* 7.5:

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* - add flags and max_write to fuse_init_out

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* 7.6:

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* - add max_readahead to fuse_init_in and fuse_init_out

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* 7.7:

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* - add FUSE_INTERRUPT message

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* - add POSIX file lock support

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* 7.8:

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* - add lock_owner and flags fields to fuse_release_in

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* - add FUSE_BMAP message

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* - add FUSE_DESTROY message

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* 7.9:

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* - new fuse_getattr_in input argument of GETATTR

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* - add lk_flags in fuse_lk_in

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* - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in

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* - add blksize field to fuse_attr

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* - add file flags field to fuse_read_in and fuse_write_in

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* - Add ATIME_NOW and MTIME_NOW flags to fuse_setattr_in

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* 7.10

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* - add nonseekable open flag

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* 7.11

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* - add IOCTL message

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* - add unsolicited notification support

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* - add POLL message and NOTIFY_POLL notification

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* 7.12

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* - add umask flag to input argument of create, mknod and mkdir

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* - add notification messages for invalidation of inodes and

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* directory entries

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* 7.13

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* - make max number of background requests and congestion threshold

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* tunables

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* 7.14

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* - add splice support to fuse device

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* 7.15

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* - add store notify

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* - add retrieve notify

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* 7.16

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* - add BATCH_FORGET request

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* - FUSE_IOCTL_UNRESTRICTED shall now return with array of 'struct

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* fuse_ioctl_iovec' instead of ambiguous 'struct iovec'

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* - add FUSE_IOCTL_32BIT flag

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* 7.17

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* - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK

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* 7.18

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* - add FUSE_IOCTL_DIR flag

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* - add FUSE_NOTIFY_DELETE

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* 7.19

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* - add FUSE_FALLOCATE

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* 7.20

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* - add FUSE_AUTO_INVAL_DATA

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* 7.21

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* - add FUSE_READDIRPLUS

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* - send the requested events in POLL request

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* 7.22

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* - add FUSE_ASYNC_DIO

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* 7.23

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* - add FUSE_WRITEBACK_CACHE

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* - add time_gran to fuse_init_out

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* - add reserved space to fuse_init_out

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* - add FATTR_CTIME

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* - add ctime and ctimensec to fuse_setattr_in

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* - add FUSE_RENAME2 request

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* - add FUSE_NO_OPEN_SUPPORT flag

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* 7.24

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* - add FUSE_LSEEK for SEEK_HOLE and SEEK_DATA support

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* 7.25

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* - add FUSE_PARALLEL_DIROPS

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* 7.26

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* - add FUSE_HANDLE_KILLPRIV

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* - add FUSE_POSIX_ACL

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* 7.27

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* - add FUSE_ABORT_ERROR

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* 7.28

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* - add FUSE_COPY_FILE_RANGE

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* - add FOPEN_CACHE_DIR

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* - add FUSE_MAX_PAGES, add max_pages to init_out

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* - add FUSE_CACHE_SYMLINKS

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* 7.29

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* - add FUSE_NO_OPENDIR_SUPPORT flag

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* 7.30

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* - add FUSE_EXPLICIT_INVAL_DATA

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* - add FUSE_IOCTL_COMPAT_X32

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* 7.31

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* - add FUSE_WRITE_KILL_PRIV flag

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* - add FUSE_SETUPMAPPING and FUSE_REMOVEMAPPING

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* - add map_alignment to fuse_init_out, add FUSE_MAP_ALIGNMENT flag

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* 7.32

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* - add flags to fuse_attr, add FUSE_ATTR_SUBMOUNT, add FUSE_SUBMOUNTS

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* 7.33

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* - add FUSE_HANDLE_KILLPRIV_V2, FUSE_WRITE_KILL_SUIDGID, FATTR_KILL_SUIDGID

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* - add FUSE_OPEN_KILL_SUIDGID

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* - extend fuse_setxattr_in, add FUSE_SETXATTR_EXT

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* - add FUSE_SETXATTR_ACL_KILL_SGID

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* - add FUSE_EXPIRE_ONLY flag to fuse_notify_inval_entry

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* - add FUSE_HAS_EXPIRE_ONLY

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* 7.34

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* - add FUSE_SYNCFS

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#ifndef _LINUX_FUSE_H

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#define _LINUX_FUSE_H

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#include <stdint.h>

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* Version negotiation:

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* Both the kernel and userspace send the version they support in the

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* INIT request and reply respectively.

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* If the major versions match then both shall use the smallest

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* of the two minor versions for communication.

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* If the kernel supports a larger major version, then userspace shall

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* reply with the major version it supports, ignore the rest of the

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* INIT message and expect a new INIT message from the kernel with a

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* matching major version.

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* If the library supports a larger major version, then it shall fall

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* back to the major protocol version sent by the kernel for

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* communication and reply with that major version (and an arbitrary

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* supported minor version).

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/** Version number of this interface */

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#define FUSE_KERNEL_VERSION 7

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/** Minor version number of this interface */

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#define FUSE_KERNEL_MINOR_VERSION 34

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/** The node ID of the root inode */

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#define FUSE_ROOT_ID 1

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/* Make sure all structures are padded to 64bit boundary, so 32bit

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userspace works under 64bit kernels */

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struct fuse_attr {

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uint64_t ino;

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uint64_t size;

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uint64_t blocks;

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uint64_t atime;

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uint64_t mtime;

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uint64_t ctime;

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uint32_t atimensec;

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uint32_t mtimensec;

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uint32_t ctimensec;

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uint32_t mode;

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uint32_t nlink;

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uint32_t uid;

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uint32_t gid;

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uint32_t rdev;

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uint32_t blksize;

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uint32_t flags;

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};

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struct fuse_kstatfs {

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uint64_t blocks;

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uint64_t bfree;

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uint64_t bavail;

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uint64_t files;

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uint64_t ffree;

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uint32_t bsize;

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uint32_t namelen;

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uint32_t frsize;

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uint32_t padding;

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uint32_t spare[6];

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};

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struct fuse_file_lock {

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uint64_t start;

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uint64_t end;

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uint32_t type;

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uint32_t pid; /* tgid */

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};

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/**

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* Bitmasks for fuse_setattr_in.valid

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#define FATTR_MODE (1 << 0)

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#define FATTR_UID (1 << 1)

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#define FATTR_GID (1 << 2)

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#define FATTR_SIZE (1 << 3)

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#define FATTR_ATIME (1 << 4)

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#define FATTR_MTIME (1 << 5)

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#define FATTR_FH (1 << 6)

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#define FATTR_ATIME_NOW (1 << 7)

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#define FATTR_MTIME_NOW (1 << 8)

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#define FATTR_LOCKOWNER (1 << 9)

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#define FATTR_CTIME (1 << 10)

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#define FATTR_KILL_SUIDGID (1 << 11)

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/**

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* Flags returned by the OPEN request

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* FOPEN_DIRECT_IO: bypass page cache for this open file

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* FOPEN_KEEP_CACHE: don't invalidate the data cache on open

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* FOPEN_NONSEEKABLE: the file is not seekable

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* FOPEN_CACHE_DIR: allow caching this directory

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#define FOPEN_DIRECT_IO (1 << 0)

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#define FOPEN_KEEP_CACHE (1 << 1)

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#define FOPEN_NONSEEKABLE (1 << 2)

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#define FOPEN_CACHE_DIR (1 << 3)

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/**

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* INIT request/reply flags

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* FUSE_ASYNC_READ: asynchronous read requests

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* FUSE_POSIX_LOCKS: remote locking for POSIX file locks

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* FUSE_FILE_OPS: kernel sends file handle for fstat, etc... (not yet supported)

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* FUSE_ATOMIC_O_TRUNC: handles the O_TRUNC open flag in the filesystem

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* FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."

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* FUSE_BIG_WRITES: filesystem can handle write size larger than 4kB

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* FUSE_DONT_MASK: don't apply umask to file mode on create operations

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* FUSE_SPLICE_WRITE: kernel supports splice write on the device

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* FUSE_SPLICE_MOVE: kernel supports splice move on the device

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* FUSE_SPLICE_READ: kernel supports splice read on the device

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* FUSE_FLOCK_LOCKS: remote locking for BSD style file locks

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* FUSE_HAS_IOCTL_DIR: kernel supports ioctl on directories

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* FUSE_AUTO_INVAL_DATA: automatically invalidate cached pages

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* FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one)

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* FUSE_READDIRPLUS_AUTO: adaptive readdirplus

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* FUSE_ASYNC_DIO: asynchronous direct I/O submission

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* FUSE_WRITEBACK_CACHE: use writeback cache for buffered writes

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* FUSE_NO_OPEN_SUPPORT: kernel supports zero-message opens

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* FUSE_PARALLEL_DIROPS: allow parallel lookups and readdir

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* FUSE_HANDLE_KILLPRIV: fs handles killing suid/sgid/cap on write/chown/trunc

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* FUSE_POSIX_ACL: filesystem supports posix acls

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* FUSE_ABORT_ERROR: reading the device after abort returns ECONNABORTED

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* FUSE_MAX_PAGES: init_out.max_pages contains the max number of req pages

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* FUSE_CACHE_SYMLINKS: cache READLINK responses

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* FUSE_NO_OPENDIR_SUPPORT: kernel supports zero-message opendir

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* FUSE_EXPLICIT_INVAL_DATA: only invalidate cached pages on explicit request

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* FUSE_MAP_ALIGNMENT: init_out.map_alignment contains log2(byte alignment) for

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* foffset and moffset fields in struct

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* fuse_setupmapping_out and fuse_removemapping_one.

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* FUSE_SUBMOUNTS: kernel supports auto-mounting directory submounts

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* FUSE_HANDLE_KILLPRIV_V2: fs kills suid/sgid/cap on write/chown/trunc.

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* Upon write/truncate suid/sgid is only killed if caller

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* does not have CAP_FSETID. Additionally upon

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* write/truncate sgid is killed only if file has group

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* execute permission. (Same as Linux VFS behavior).

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* FUSE_SETXATTR_EXT: Server supports extended struct fuse_setxattr_in

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* FUSE_INIT_EXT: extended fuse_init_in request

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* FUSE_INIT_RESERVED: reserved, do not use

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* FUSE_HAS_EXPIRE_ONLY: kernel supports expiry-only entry invalidation

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#define FUSE_ASYNC_READ (1 << 0)

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#define FUSE_POSIX_LOCKS (1 << 1)

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#define FUSE_FILE_OPS (1 << 2)

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#define FUSE_ATOMIC_O_TRUNC (1 << 3)

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#define FUSE_EXPORT_SUPPORT (1 << 4)

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#define FUSE_BIG_WRITES (1 << 5)

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#define FUSE_DONT_MASK (1 << 6)

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#define FUSE_SPLICE_WRITE (1 << 7)

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#define FUSE_SPLICE_MOVE (1 << 8)

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#define FUSE_SPLICE_READ (1 << 9)

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#define FUSE_FLOCK_LOCKS (1 << 10)

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#define FUSE_HAS_IOCTL_DIR (1 << 11)

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#define FUSE_AUTO_INVAL_DATA (1 << 12)

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#define FUSE_DO_READDIRPLUS (1 << 13)

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#define FUSE_READDIRPLUS_AUTO (1 << 14)

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#define FUSE_ASYNC_DIO (1 << 15)

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#define FUSE_WRITEBACK_CACHE (1 << 16)

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#define FUSE_NO_OPEN_SUPPORT (1 << 17)

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#define FUSE_PARALLEL_DIROPS (1 << 18)

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#define FUSE_HANDLE_KILLPRIV (1 << 19)

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#define FUSE_POSIX_ACL (1 << 20)

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#define FUSE_ABORT_ERROR (1 << 21)

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#define FUSE_MAX_PAGES (1 << 22)

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#define FUSE_CACHE_SYMLINKS (1 << 23)

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#define FUSE_NO_OPENDIR_SUPPORT (1 << 24)

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#define FUSE_EXPLICIT_INVAL_DATA (1 << 25)

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#define FUSE_MAP_ALIGNMENT (1 << 26)

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#define FUSE_SUBMOUNTS (1 << 27)

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#define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)

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#define FUSE_SETXATTR_EXT (1 << 29)

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#define FUSE_INIT_EXT (1 << 30)

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#define FUSE_INIT_RESERVED (1 << 31)

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/* bits 32..63 get shifted down 32 bits into the flags2 field */

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#define FUSE_HAS_EXPIRE_ONLY (1ULL << 35)

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/**

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* CUSE INIT request/reply flags

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* CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl

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#define CUSE_UNRESTRICTED_IOCTL (1 << 0)

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/**

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* Release flags

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#define FUSE_RELEASE_FLUSH (1 << 0)

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#define FUSE_RELEASE_FLOCK_UNLOCK (1 << 1)

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/**

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* Getattr flags

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#define FUSE_GETATTR_FH (1 << 0)

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/**

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* Lock flags

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#define FUSE_LK_FLOCK (1 << 0)

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/**

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* WRITE flags

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* FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed

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* FUSE_WRITE_LOCKOWNER: lock_owner field is valid

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* FUSE_WRITE_KILL_SUIDGID: kill suid and sgid bits

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#define FUSE_WRITE_CACHE (1 << 0)

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#define FUSE_WRITE_LOCKOWNER (1 << 1)

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#define FUSE_WRITE_KILL_SUIDGID (1 << 2)

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/* Obsolete alias; this flag implies killing suid/sgid only. */

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#define FUSE_WRITE_KILL_PRIV FUSE_WRITE_KILL_SUIDGID

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/**

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* Read flags

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#define FUSE_READ_LOCKOWNER (1 << 1)

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/**

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* Ioctl flags

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* FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine

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* FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed

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* FUSE_IOCTL_RETRY: retry with new iovecs

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* FUSE_IOCTL_32BIT: 32bit ioctl

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* FUSE_IOCTL_DIR: is a directory

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* FUSE_IOCTL_COMPAT_X32: x32 compat ioctl on 64bit machine (64bit time_t)

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* FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs

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#define FUSE_IOCTL_COMPAT (1 << 0)

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#define FUSE_IOCTL_UNRESTRICTED (1 << 1)

[428] Fix | Delete

#define FUSE_IOCTL_RETRY (1 << 2)

[429] Fix | Delete

#define FUSE_IOCTL_32BIT (1 << 3)

[430] Fix | Delete

#define FUSE_IOCTL_DIR (1 << 4)

[431] Fix | Delete

#define FUSE_IOCTL_COMPAT_X32 (1 << 5)

[432] Fix | Delete

[433] Fix | Delete

#define FUSE_IOCTL_MAX_IOV 256

[434] Fix | Delete

[435] Fix | Delete

/**

[436] Fix | Delete

* Poll flags

[437] Fix | Delete

[438] Fix | Delete

* FUSE_POLL_SCHEDULE_NOTIFY: request poll notify

[439] Fix | Delete

[440] Fix | Delete

#define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)

[441] Fix | Delete

[442] Fix | Delete

/**

[443] Fix | Delete

* Fsync flags

[444] Fix | Delete

[445] Fix | Delete

* FUSE_FSYNC_FDATASYNC: Sync data only, not metadata

[446] Fix | Delete

[447] Fix | Delete

#define FUSE_FSYNC_FDATASYNC (1 << 0)

[448] Fix | Delete

[449] Fix | Delete

/**

[450] Fix | Delete

* fuse_attr flags

[451] Fix | Delete

[452] Fix | Delete

* FUSE_ATTR_SUBMOUNT: Object is a submount root

[453] Fix | Delete

[454] Fix | Delete

#define FUSE_ATTR_SUBMOUNT (1 << 0)

[455] Fix | Delete

[456] Fix | Delete

/**

[457] Fix | Delete

* Open flags

[458] Fix | Delete

* FUSE_OPEN_KILL_SUIDGID: Kill suid and sgid if executable

[459] Fix | Delete

[460] Fix | Delete

#define FUSE_OPEN_KILL_SUIDGID (1 << 0)

[461] Fix | Delete

[462] Fix | Delete

/**

[463] Fix | Delete

* setxattr flags

[464] Fix | Delete

* FUSE_SETXATTR_ACL_KILL_SGID: Clear SGID when system.posix_acl_access is set

[465] Fix | Delete

[466] Fix | Delete

#define FUSE_SETXATTR_ACL_KILL_SGID (1 << 0)

[467] Fix | Delete

[468] Fix | Delete

/**

[469] Fix | Delete

* notify_inval_entry flags

[470] Fix | Delete

* FUSE_EXPIRE_ONLY

[471] Fix | Delete

[472] Fix | Delete

#define FUSE_EXPIRE_ONLY (1 << 0)

[473] Fix | Delete

[474] Fix | Delete

enum fuse_opcode {

[475] Fix | Delete

FUSE_LOOKUP = 1,

[476] Fix | Delete

FUSE_FORGET = 2, /* no reply */

[477] Fix | Delete

FUSE_GETATTR = 3,

[478] Fix | Delete

FUSE_SETATTR = 4,

[479] Fix | Delete

FUSE_READLINK = 5,

[480] Fix | Delete

FUSE_SYMLINK = 6,

[481] Fix | Delete

FUSE_MKNOD = 8,

[482] Fix | Delete

FUSE_MKDIR = 9,

[483] Fix | Delete

FUSE_UNLINK = 10,

[484] Fix | Delete

FUSE_RMDIR = 11,

[485] Fix | Delete

FUSE_RENAME = 12,

[486] Fix | Delete

FUSE_LINK = 13,

[487] Fix | Delete

FUSE_OPEN = 14,

[488] Fix | Delete

FUSE_READ = 15,

[489] Fix | Delete

FUSE_WRITE = 16,

[490] Fix | Delete

FUSE_STATFS = 17,

[491] Fix | Delete

FUSE_RELEASE = 18,

[492] Fix | Delete

FUSE_FSYNC = 20,

[493] Fix | Delete

FUSE_SETXATTR = 21,

[494] Fix | Delete

FUSE_GETXATTR = 22,

[495] Fix | Delete

FUSE_LISTXATTR = 23,

[496] Fix | Delete

FUSE_REMOVEXATTR = 24,

[497] Fix | Delete

FUSE_FLUSH = 25,

[498] Fix | Delete

FUSE_INIT = 26,

[499] Fix | Delete