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![Miklos Szeredi](/assets/img/avatar_default.png)
Without async DIO write requests to a single file were always serialized. With async DIO that's no longer the case. So don't turn on async DIO by default for fear of breaking backward compatibility. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
732 lines
16 KiB
C
732 lines
16 KiB
C
/*
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This file defines the kernel interface of FUSE
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Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
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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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Copyright (C) 2001-2007 Miklos Szeredi. All rights reserved.
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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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*/
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/*
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* This file defines the kernel interface of FUSE
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*
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* Protocol changelog:
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*
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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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*
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* 7.10
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* - add nonseekable open flag
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*
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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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*
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* 7.12
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* - add umask flag to input argument of open, 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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*
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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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*
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* 7.14
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* - add splice support to fuse device
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*
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* 7.15
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* - add store notify
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* - add retrieve notify
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*
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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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*
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* 7.17
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* - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK
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*
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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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*
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* 7.19
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* - add FUSE_FALLOCATE
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*
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* 7.20
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* - add FUSE_AUTO_INVAL_DATA
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*
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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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*
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* 7.22
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* - add FUSE_ASYNC_DIO
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*/
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#ifndef _LINUX_FUSE_H
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#define _LINUX_FUSE_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#else
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#include <stdint.h>
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#endif
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/*
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* Version negotiation:
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*
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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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*
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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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*
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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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*
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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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*/
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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 22
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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 padding;
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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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*/
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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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/**
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* Flags returned by the OPEN request
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*
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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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*/
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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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/**
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* INIT request/reply flags
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*
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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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*/
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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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/**
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* CUSE INIT request/reply flags
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*
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* CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl
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*/
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#define CUSE_UNRESTRICTED_IOCTL (1 << 0)
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/**
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* Release flags
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*/
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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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*/
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#define FUSE_GETATTR_FH (1 << 0)
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/**
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* Lock flags
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*/
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#define FUSE_LK_FLOCK (1 << 0)
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/**
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* WRITE flags
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*
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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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*/
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#define FUSE_WRITE_CACHE (1 << 0)
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#define FUSE_WRITE_LOCKOWNER (1 << 1)
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/**
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* Read flags
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*/
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#define FUSE_READ_LOCKOWNER (1 << 1)
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/**
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* Ioctl flags
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*
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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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*
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* FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
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*/
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#define FUSE_IOCTL_COMPAT (1 << 0)
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#define FUSE_IOCTL_UNRESTRICTED (1 << 1)
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#define FUSE_IOCTL_RETRY (1 << 2)
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#define FUSE_IOCTL_32BIT (1 << 3)
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#define FUSE_IOCTL_DIR (1 << 4)
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#define FUSE_IOCTL_MAX_IOV 256
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/**
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* Poll flags
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*
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* FUSE_POLL_SCHEDULE_NOTIFY: request poll notify
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*/
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#define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
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enum fuse_opcode {
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FUSE_LOOKUP = 1,
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FUSE_FORGET = 2, /* no reply */
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FUSE_GETATTR = 3,
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FUSE_SETATTR = 4,
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FUSE_READLINK = 5,
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FUSE_SYMLINK = 6,
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FUSE_MKNOD = 8,
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FUSE_MKDIR = 9,
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FUSE_UNLINK = 10,
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FUSE_RMDIR = 11,
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FUSE_RENAME = 12,
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FUSE_LINK = 13,
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FUSE_OPEN = 14,
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FUSE_READ = 15,
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FUSE_WRITE = 16,
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FUSE_STATFS = 17,
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FUSE_RELEASE = 18,
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FUSE_FSYNC = 20,
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FUSE_SETXATTR = 21,
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FUSE_GETXATTR = 22,
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FUSE_LISTXATTR = 23,
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FUSE_REMOVEXATTR = 24,
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FUSE_FLUSH = 25,
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FUSE_INIT = 26,
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FUSE_OPENDIR = 27,
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FUSE_READDIR = 28,
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FUSE_RELEASEDIR = 29,
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FUSE_FSYNCDIR = 30,
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FUSE_GETLK = 31,
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FUSE_SETLK = 32,
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FUSE_SETLKW = 33,
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FUSE_ACCESS = 34,
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FUSE_CREATE = 35,
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FUSE_INTERRUPT = 36,
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FUSE_BMAP = 37,
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FUSE_DESTROY = 38,
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FUSE_IOCTL = 39,
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FUSE_POLL = 40,
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FUSE_NOTIFY_REPLY = 41,
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FUSE_BATCH_FORGET = 42,
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FUSE_FALLOCATE = 43,
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FUSE_READDIRPLUS = 44,
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/* CUSE specific operations */
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CUSE_INIT = 4096,
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};
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enum fuse_notify_code {
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FUSE_NOTIFY_POLL = 1,
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FUSE_NOTIFY_INVAL_INODE = 2,
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FUSE_NOTIFY_INVAL_ENTRY = 3,
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FUSE_NOTIFY_STORE = 4,
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FUSE_NOTIFY_RETRIEVE = 5,
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FUSE_NOTIFY_DELETE = 6,
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FUSE_NOTIFY_CODE_MAX,
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};
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/* The read buffer is required to be at least 8k, but may be much larger */
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#define FUSE_MIN_READ_BUFFER 8192
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#define FUSE_COMPAT_ENTRY_OUT_SIZE 120
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struct fuse_entry_out {
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uint64_t nodeid; /* Inode ID */
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uint64_t generation; /* Inode generation: nodeid:gen must
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be unique for the fs's lifetime */
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uint64_t entry_valid; /* Cache timeout for the name */
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uint64_t attr_valid; /* Cache timeout for the attributes */
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uint32_t entry_valid_nsec;
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uint32_t attr_valid_nsec;
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struct fuse_attr attr;
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};
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struct fuse_forget_in {
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uint64_t nlookup;
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};
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struct fuse_forget_one {
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uint64_t nodeid;
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uint64_t nlookup;
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};
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struct fuse_batch_forget_in {
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uint32_t count;
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uint32_t dummy;
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};
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struct fuse_getattr_in {
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uint32_t getattr_flags;
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uint32_t dummy;
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uint64_t fh;
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};
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#define FUSE_COMPAT_ATTR_OUT_SIZE 96
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struct fuse_attr_out {
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uint64_t attr_valid; /* Cache timeout for the attributes */
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uint32_t attr_valid_nsec;
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uint32_t dummy;
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struct fuse_attr attr;
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};
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#define FUSE_COMPAT_MKNOD_IN_SIZE 8
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struct fuse_mknod_in {
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uint32_t mode;
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uint32_t rdev;
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uint32_t umask;
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uint32_t padding;
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};
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struct fuse_mkdir_in {
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uint32_t mode;
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uint32_t umask;
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};
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struct fuse_rename_in {
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uint64_t newdir;
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};
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struct fuse_link_in {
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uint64_t oldnodeid;
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};
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struct fuse_setattr_in {
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uint32_t valid;
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uint32_t padding;
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uint64_t fh;
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uint64_t size;
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uint64_t lock_owner;
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uint64_t atime;
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uint64_t mtime;
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uint64_t unused2;
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uint32_t atimensec;
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uint32_t mtimensec;
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uint32_t unused3;
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uint32_t mode;
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uint32_t unused4;
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uint32_t uid;
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uint32_t gid;
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uint32_t unused5;
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};
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struct fuse_open_in {
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uint32_t flags;
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uint32_t unused;
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};
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struct fuse_create_in {
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uint32_t flags;
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uint32_t mode;
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uint32_t umask;
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uint32_t padding;
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};
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struct fuse_open_out {
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uint64_t fh;
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uint32_t open_flags;
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uint32_t padding;
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};
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struct fuse_release_in {
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uint64_t fh;
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uint32_t flags;
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uint32_t release_flags;
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uint64_t lock_owner;
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};
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struct fuse_flush_in {
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uint64_t fh;
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uint32_t unused;
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uint32_t padding;
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uint64_t lock_owner;
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};
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struct fuse_read_in {
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uint64_t fh;
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uint64_t offset;
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uint32_t size;
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uint32_t read_flags;
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uint64_t lock_owner;
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uint32_t flags;
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uint32_t padding;
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};
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#define FUSE_COMPAT_WRITE_IN_SIZE 24
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struct fuse_write_in {
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uint64_t fh;
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uint64_t offset;
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uint32_t size;
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uint32_t write_flags;
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uint64_t lock_owner;
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uint32_t flags;
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uint32_t padding;
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};
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struct fuse_write_out {
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uint32_t size;
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uint32_t padding;
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};
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#define FUSE_COMPAT_STATFS_SIZE 48
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struct fuse_statfs_out {
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struct fuse_kstatfs st;
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};
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struct fuse_fsync_in {
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uint64_t fh;
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uint32_t fsync_flags;
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uint32_t padding;
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};
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struct fuse_setxattr_in {
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uint32_t size;
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uint32_t flags;
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};
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struct fuse_getxattr_in {
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uint32_t size;
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uint32_t padding;
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};
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struct fuse_getxattr_out {
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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;
|
|
uint16_t max_background;
|
|
uint16_t congestion_threshold;
|
|
uint32_t max_write;
|
|
};
|
|
|
|
#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;
|
|
};
|
|
|
|
#endif /* _LINUX_FUSE_H */
|