lib/fuse_dispatcher introduced (a9eea50d) · Commits · Public Repositories / spdk

include/linux/fuse_kernel.h

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		/* 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:
		*
		* 7.9:
		* - 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
		*
		* 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 open, 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
		*/

		#ifndef _LINUX_FUSE_H
		#define _LINUX_FUSE_H

		#ifdef __KERNEL__
		#include <linux/types.h>
		#else
		#include <stdint.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 27

		/** 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 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; /* 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)

		/**
		* 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
		*/
		#define FOPEN_DIRECT_IO (1 << 0)
		#define FOPEN_KEEP_CACHE (1 << 1)
		#define FOPEN_NONSEEKABLE (1 << 2)

		/**
		* 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
		*/
		#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)

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

		/**
		* 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
		*/
		#define FUSE_WRITE_CACHE (1 << 0)
		#define FUSE_WRITE_LOCKOWNER (1 << 1)

		/**
		* 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_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_MAX_IOV 256

		/**
		* Poll flags
		*
		* FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
		*/
		#define FUSE_POLL_SCHEDULE_NOTIFY (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,

		/* CUSE specific operations */
		CUSE_INIT = 4096,
		};

		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 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;
		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;
		};

		#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;
		uint32_t unused[9];
		};

		#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];
		};

		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_CLONE _IOR(229, 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_ENTRIES 8
		#define FUSE_SETUPMAPPING_FLAG_WRITE (1ull << 0)
		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;
		/* memory offset in to dax window */
		uint64_t moffset;
		};

		struct fuse_setupmapping_out {
		/* Offsets into the cache of mappings */
		uint64_t coffset[FUSE_SETUPMAPPING_ENTRIES];
		/* Lengths of each mapping */
		uint64_t len[FUSE_SETUPMAPPING_ENTRIES];
		};

		struct fuse_removemapping_in {
		/* An already open handle */
		uint64_t fh;
		/* Offset into the dax to start the unmapping */
		uint64_t moffset;
		/* Length of mapping required */
		uint64_t len;
		};

		#endif /* _LINUX_FUSE_H */

include/spdk/fuse_dispatcher.h

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		/* SPDX-License-Identifier: BSD-3-Clause
		* Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
		*/

		/** \file
		* Operations on a FUSE fsdev dispatcher
		*/

		#ifndef SPDK_FUSE_DISPATCHER_H
		#define SPDK_FUSE_DISPATCHER_H

		#include "spdk/stdinc.h"

		#ifdef __cplusplus
		extern "C" {
		#endif

		struct spdk_fuse_dispatcher;

		enum spdk_fuse_arch {
		SPDK_FUSE_ARCH_NATIVE,
		SPDK_FUSE_ARCH_X86,
		SPDK_FUSE_ARCH_X86_64,
		SPDK_FUSE_ARCH_ARM,
		SPDK_FUSE_ARCH_ARM64,
		_SPDK_FUSE_ARCH_LAST,
		};

		/**
		* FUSE fsdev dispatcher create completion callback.
		*
		* \param cb_arg Callback argument specified upon create operation.
		* \param disp FUSE fsdev dispatcher object. NULL if creation failed.
		*/
		typedef void (spdk_fuse_dispatcher_create_cpl_cb)(void cb_arg, struct spdk_fuse_dispatcher *disp);

		/**
		* FUSE fsdev dispatcher submit completion callback.
		*
		* \param cb_arg Callback argument specified upon submit operation.
		* \param error 0 if the operation succeeded, a negative error code otherwise.
		*/
		typedef void (spdk_fuse_dispatcher_submit_cpl_cb)(void cb_arg, int error);

		/**
		* FUSE fsdev dispatcher delete completion callback.
		*
		* \param cb_arg Callback argument specified upon delete operation.
		* \param error 0 if the operation succeeded, a negative error code otherwise.
		*/
		typedef void (spdk_fuse_dispatcher_delete_cpl_cb)(void cb_arg, int error);


		/** Asynchronous event type */
		enum spdk_fuse_dispatcher_event_type {
		SPDK_FUSE_DISP_EVENT_FSDEV_REMOVE,
		};

		/**
		* FUSE fsdev dispatcher event callback.
		*
		* \param type Event type.
		* \param disp FUSE fsdev dispatcher object.
		* \param event_ctx Context for the filesystem device event.
		*/
		typedef void (*spdk_fuse_dispatcher_event_cb)(enum spdk_fuse_dispatcher_event_type type,
		struct spdk_fuse_dispatcher disp, void event_ctx);

		/**
		* Create a FUSE fsdev dispatcher
		*
		* \param fsdev_name Name of the fsdev to work with.
		* \param event_cb Dispatcher event callback.
		* \param event_ctx Dispatcher event callback's context.
		* \param cb Completion callback.
		* \param cb_arg Context to be passed to the completion callback.
		*
		* \return 0 on success, a negative error code otherwise.
		* On success, the callback will always be called (even if the request ultimately failed).
		*/
		int spdk_fuse_dispatcher_create(const char *fsdev_name, spdk_fuse_dispatcher_event_cb event_cb,
		void event_ctx, spdk_fuse_dispatcher_create_cpl_cb cb, void cb_arg);

		/**
		* Set a FUSE request source's HW architecture.
		*
		* Unless this function is called explicitly, the arch set to SPDK_FUSE_ARCH_NATIVE.
		*
		* \param disp FUSE fsdev dispatcher object.
		* \param fuse_arch FUSE request source's HW architecture
		*
		* \return 0 on success or -EINVAL if the architecture is not supported
		*/
		int spdk_fuse_dispatcher_set_arch(struct spdk_fuse_dispatcher *disp, enum spdk_fuse_arch fuse_arch);

		/**
		* Get underlying fsdev name
		*
		* \param disp FUSE fsdev dispatcher object.
		*
		* \return fsdev name
		*/
		const char spdk_fuse_dispatcher_get_fsdev_name(struct spdk_fuse_dispatcher disp);

		/**
		* Obtain an I/O channel for the FUSE fsdev dispatcher object. I/O channels are
		* bound to threads, so the resulting I/O channel may only be used from the thread
		* it was originally obtained from.
		*
		* \param disp FUSE fsdev dispatcher object.
		*
		* \return A handle to the I/O channel or NULL on failure.
		*/
		struct spdk_io_channel spdk_fuse_dispatcher_get_io_channel(struct spdk_fuse_dispatcher disp);

		/**
		* Submit FUSE request
		*
		* \param disp FUSE fsdev dispatcher object.
		* \param ch I/O channel obtained from the \p spdk_fuse_dispatcher_get_io_channel.
		* \param in_iov Input IO vectors array.
		* \param in_iovcnt Size of the input IO vectors array.
		* \param out_iov Output IO vectors array.
		* \param out_iovcnt Size of the output IO vectors array.
		* \param cb Completion callback.
		* \param cb_arg Context to be passed to the completion callback.
		*
		* \return 0 on success. On success, the callback will always
		* be called (even if the request ultimately failed). Return
		* negated errno on failure, in which case the callback will not be called.
		* -ENOBUFS - the request cannot be submitted due to a lack of the internal IO objects
		* -EINVAL - the request cannot be submitted as some FUSE request data is incorrect
		*/
		int spdk_fuse_dispatcher_submit_request(struct spdk_fuse_dispatcher *disp,
		struct spdk_io_channel *ch,
		struct iovec *in_iov, int in_iovcnt,
		struct iovec *out_iov, int out_iovcnt,
		spdk_fuse_dispatcher_submit_cpl_cb cb, void *cb_arg);

		/**
		* Delete a FUSE fsdev dispatcher
		*
		* \param disp FUSE fsdev dispatcher object.
		* \param cb Completion callback.
		* \param cb_arg Context to be passed to the completion callback.
		*
		* \return 0 on success, a negative error code otherwise.
		* On success, the callback will always be called (even if the request ultimately failed).
		*/
		int spdk_fuse_dispatcher_delete(struct spdk_fuse_dispatcher *disp,
		spdk_fuse_dispatcher_delete_cpl_cb cb, void *cb_arg);

		#ifdef __cplusplus
		}
		#endif

		#endif /* SPDK_FUSE_DISPATCHER_H */

lib/Makefile

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Original line number	Diff line number	Diff line
		@@ -32,7 +32,7 @@ DIRS-$(CONFIG_VBDEV_COMPRESS) += reduce
		DIRS-$(CONFIG_RDMA) += rdma_provider
		DIRS-$(CONFIG_RDMA) += rdma_utils
		DIRS-$(CONFIG_VFIO_USER) += vfu_tgt
		DIRS-$(CONFIG_FSDEV) += fsdev
		DIRS-$(CONFIG_FSDEV) += fsdev fuse_dispatcher

		ifeq ($(CONFIG_RDMA_PROV),mlx5_dv)
		DIRS-y += mlx5

lib/fuse_dispatcher/Makefile

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		# SPDX-License-Identifier: BSD-3-Clause
		# Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES.
		# All rights reserved.

		SPDK_ROOT_DIR := $(abspath $(CURDIR)/../..)
		include $(SPDK_ROOT_DIR)/mk/spdk.common.mk

		SO_VER := 1
		SO_MINOR := 0

		C_SRCS = fuse_dispatcher.c
		LIBNAME = fuse_dispatcher

		INCLUDE_ROOT=$(abspath $(CURDIR)/../../include)

		CFLAGS += -I$(INCLUDE_ROOT)

		SPDK_MAP_FILE = $(abspath $(CURDIR)/fuse_dispatcher.map)

		include $(SPDK_ROOT_DIR)/mk/spdk.lib.mk

lib/fuse_dispatcher/fuse_dispatcher.c

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