File: fuse_kernel.go

package info (click to toggle)
golang-github-jacobsa-bazilfuse 0.0~git20150622-4
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 736 kB
  • sloc: sh: 26; makefile: 4
file content (766 lines) | stat: -rw-r--r-- 17,575 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
// See the file LICENSE for copyright and licensing information.

// Derived from FUSE's fuse_kernel.h, which carries this notice:
/*
   This file defines the kernel interface of FUSE
   Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>


   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.
*/

package bazilfuse

import (
	"fmt"
	"syscall"
	"unsafe"
)

// The FUSE version implemented by the package.
const (
	protoVersionMinMajor = 7
	protoVersionMinMinor = 8
	protoVersionMaxMajor = 7
	protoVersionMaxMinor = 12
)

const (
	rootID = 1
)

type kstatfs struct {
	Blocks  uint64
	Bfree   uint64
	Bavail  uint64
	Files   uint64
	Ffree   uint64
	Bsize   uint32
	Namelen uint32
	Frsize  uint32
	Padding uint32
	Spare   [6]uint32
}

type fileLock struct {
	Start uint64
	End   uint64
	Type  uint32
	Pid   uint32
}

// GetattrFlags are bit flags that can be seen in GetattrRequest.
type GetattrFlags uint32

const (
	// Indicates the handle is valid.
	GetattrFh GetattrFlags = 1 << 0
)

var getattrFlagsNames = []flagName{
	{uint32(GetattrFh), "GetattrFh"},
}

func (fl GetattrFlags) String() string {
	return flagString(uint32(fl), getattrFlagsNames)
}

// The SetattrValid are bit flags describing which fields in the SetattrRequest
// are included in the change.
type SetattrValid uint32

const (
	SetattrMode   SetattrValid = 1 << 0
	SetattrUid    SetattrValid = 1 << 1
	SetattrGid    SetattrValid = 1 << 2
	SetattrSize   SetattrValid = 1 << 3
	SetattrAtime  SetattrValid = 1 << 4
	SetattrMtime  SetattrValid = 1 << 5
	SetattrHandle SetattrValid = 1 << 6

	// Linux only(?)
	SetattrAtimeNow  SetattrValid = 1 << 7
	SetattrMtimeNow  SetattrValid = 1 << 8
	SetattrLockOwner SetattrValid = 1 << 9 // http://www.mail-archive.com/git-commits-head@vger.kernel.org/msg27852.html

	// OS X only
	SetattrCrtime   SetattrValid = 1 << 28
	SetattrChgtime  SetattrValid = 1 << 29
	SetattrBkuptime SetattrValid = 1 << 30
	SetattrFlags    SetattrValid = 1 << 31
)

func (fl SetattrValid) Mode() bool      { return fl&SetattrMode != 0 }
func (fl SetattrValid) Uid() bool       { return fl&SetattrUid != 0 }
func (fl SetattrValid) Gid() bool       { return fl&SetattrGid != 0 }
func (fl SetattrValid) Size() bool      { return fl&SetattrSize != 0 }
func (fl SetattrValid) Atime() bool     { return fl&SetattrAtime != 0 }
func (fl SetattrValid) Mtime() bool     { return fl&SetattrMtime != 0 }
func (fl SetattrValid) Handle() bool    { return fl&SetattrHandle != 0 }
func (fl SetattrValid) AtimeNow() bool  { return fl&SetattrAtimeNow != 0 }
func (fl SetattrValid) MtimeNow() bool  { return fl&SetattrMtimeNow != 0 }
func (fl SetattrValid) LockOwner() bool { return fl&SetattrLockOwner != 0 }
func (fl SetattrValid) Crtime() bool    { return fl&SetattrCrtime != 0 }
func (fl SetattrValid) Chgtime() bool   { return fl&SetattrChgtime != 0 }
func (fl SetattrValid) Bkuptime() bool  { return fl&SetattrBkuptime != 0 }
func (fl SetattrValid) Flags() bool     { return fl&SetattrFlags != 0 }

func (fl SetattrValid) String() string {
	return flagString(uint32(fl), setattrValidNames)
}

var setattrValidNames = []flagName{
	{uint32(SetattrMode), "SetattrMode"},
	{uint32(SetattrUid), "SetattrUid"},
	{uint32(SetattrGid), "SetattrGid"},
	{uint32(SetattrSize), "SetattrSize"},
	{uint32(SetattrAtime), "SetattrAtime"},
	{uint32(SetattrMtime), "SetattrMtime"},
	{uint32(SetattrHandle), "SetattrHandle"},
	{uint32(SetattrAtimeNow), "SetattrAtimeNow"},
	{uint32(SetattrMtimeNow), "SetattrMtimeNow"},
	{uint32(SetattrLockOwner), "SetattrLockOwner"},
	{uint32(SetattrCrtime), "SetattrCrtime"},
	{uint32(SetattrChgtime), "SetattrChgtime"},
	{uint32(SetattrBkuptime), "SetattrBkuptime"},
	{uint32(SetattrFlags), "SetattrFlags"},
}

// Flags that can be seen in OpenRequest.Flags.
const (
	// Access modes. These are not 1-bit flags, but alternatives where
	// only one can be chosen. See the IsReadOnly etc convenience
	// methods.
	OpenReadOnly  OpenFlags = syscall.O_RDONLY
	OpenWriteOnly OpenFlags = syscall.O_WRONLY
	OpenReadWrite OpenFlags = syscall.O_RDWR

	OpenAppend    OpenFlags = syscall.O_APPEND
	OpenCreate    OpenFlags = syscall.O_CREAT
	OpenExclusive OpenFlags = syscall.O_EXCL
	OpenSync      OpenFlags = syscall.O_SYNC
	OpenTruncate  OpenFlags = syscall.O_TRUNC
)

// OpenAccessModeMask is a bitmask that separates the access mode
// from the other flags in OpenFlags.
const OpenAccessModeMask OpenFlags = syscall.O_ACCMODE

// OpenFlags are the O_FOO flags passed to open/create/etc calls. For
// example, os.O_WRONLY | os.O_APPEND.
type OpenFlags uint32

func (fl OpenFlags) String() string {
	// O_RDONLY, O_RWONLY, O_RDWR are not flags
	s := accModeName(fl & OpenAccessModeMask)
	flags := uint32(fl &^ OpenAccessModeMask)
	if flags != 0 {
		s = s + "+" + flagString(flags, openFlagNames)
	}
	return s
}

// Return true if OpenReadOnly is set.
func (fl OpenFlags) IsReadOnly() bool {
	return fl&OpenAccessModeMask == OpenReadOnly
}

// Return true if OpenWriteOnly is set.
func (fl OpenFlags) IsWriteOnly() bool {
	return fl&OpenAccessModeMask == OpenWriteOnly
}

// Return true if OpenReadWrite is set.
func (fl OpenFlags) IsReadWrite() bool {
	return fl&OpenAccessModeMask == OpenReadWrite
}

func accModeName(flags OpenFlags) string {
	switch flags {
	case OpenReadOnly:
		return "OpenReadOnly"
	case OpenWriteOnly:
		return "OpenWriteOnly"
	case OpenReadWrite:
		return "OpenReadWrite"
	default:
		return ""
	}
}

var openFlagNames = []flagName{
	{uint32(OpenCreate), "OpenCreate"},
	{uint32(OpenExclusive), "OpenExclusive"},
	{uint32(OpenTruncate), "OpenTruncate"},
	{uint32(OpenAppend), "OpenAppend"},
	{uint32(OpenSync), "OpenSync"},
}

// The OpenResponseFlags are returned in the OpenResponse.
type OpenResponseFlags uint32

const (
	OpenDirectIO    OpenResponseFlags = 1 << 0 // bypass page cache for this open file
	OpenKeepCache   OpenResponseFlags = 1 << 1 // don't invalidate the data cache on open
	OpenNonSeekable OpenResponseFlags = 1 << 2 // mark the file as non-seekable (not supported on OS X)

	OpenPurgeAttr OpenResponseFlags = 1 << 30 // OS X
	OpenPurgeUBC  OpenResponseFlags = 1 << 31 // OS X
)

func (fl OpenResponseFlags) String() string {
	return flagString(uint32(fl), openResponseFlagNames)
}

var openResponseFlagNames = []flagName{
	{uint32(OpenDirectIO), "OpenDirectIO"},
	{uint32(OpenKeepCache), "OpenKeepCache"},
	{uint32(OpenNonSeekable), "OpenNonSeekable"},
	{uint32(OpenPurgeAttr), "OpenPurgeAttr"},
	{uint32(OpenPurgeUBC), "OpenPurgeUBC"},
}

// The InitFlags are used in the Init exchange.
type InitFlags uint32

const (
	InitAsyncRead       InitFlags = 1 << 0
	InitPosixLocks      InitFlags = 1 << 1
	InitFileOps         InitFlags = 1 << 2
	InitAtomicTrunc     InitFlags = 1 << 3
	InitExportSupport   InitFlags = 1 << 4
	InitBigWrites       InitFlags = 1 << 5
	InitDontMask        InitFlags = 1 << 6
	InitSpliceWrite     InitFlags = 1 << 7
	InitSpliceMove      InitFlags = 1 << 8
	InitSpliceRead      InitFlags = 1 << 9
	InitFlockLocks      InitFlags = 1 << 10
	InitHasIoctlDir     InitFlags = 1 << 11
	InitAutoInvalData   InitFlags = 1 << 12
	InitDoReaddirplus   InitFlags = 1 << 13
	InitReaddirplusAuto InitFlags = 1 << 14
	InitAsyncDIO        InitFlags = 1 << 15
	InitWritebackCache  InitFlags = 1 << 16
	InitNoOpenSupport   InitFlags = 1 << 17

	InitCaseSensitive InitFlags = 1 << 29 // OS X only
	InitVolRename     InitFlags = 1 << 30 // OS X only
	InitXtimes        InitFlags = 1 << 31 // OS X only
)

type flagName struct {
	bit  uint32
	name string
}

var initFlagNames = []flagName{
	{uint32(InitAsyncRead), "InitAsyncRead"},
	{uint32(InitPosixLocks), "InitPosixLocks"},
	{uint32(InitFileOps), "InitFileOps"},
	{uint32(InitAtomicTrunc), "InitAtomicTrunc"},
	{uint32(InitExportSupport), "InitExportSupport"},
	{uint32(InitBigWrites), "InitBigWrites"},
	{uint32(InitDontMask), "InitDontMask"},
	{uint32(InitSpliceWrite), "InitSpliceWrite"},
	{uint32(InitSpliceMove), "InitSpliceMove"},
	{uint32(InitSpliceRead), "InitSpliceRead"},
	{uint32(InitFlockLocks), "InitFlockLocks"},
	{uint32(InitHasIoctlDir), "InitHasIoctlDir"},
	{uint32(InitAutoInvalData), "InitAutoInvalData"},
	{uint32(InitDoReaddirplus), "InitDoReaddirplus"},
	{uint32(InitReaddirplusAuto), "InitReaddirplusAuto"},
	{uint32(InitAsyncDIO), "InitAsyncDIO"},
	{uint32(InitWritebackCache), "InitWritebackCache"},
	{uint32(InitNoOpenSupport), "InitNoOpenSupport"},

	{uint32(InitCaseSensitive), "InitCaseSensitive"},
	{uint32(InitVolRename), "InitVolRename"},
	{uint32(InitXtimes), "InitXtimes"},
}

func (fl InitFlags) String() string {
	return flagString(uint32(fl), initFlagNames)
}

func flagString(f uint32, names []flagName) string {
	var s string

	if f == 0 {
		return "0"
	}

	for _, n := range names {
		if f&n.bit != 0 {
			s += "+" + n.name
			f &^= n.bit
		}
	}
	if f != 0 {
		s += fmt.Sprintf("%+#x", f)
	}
	return s[1:]
}

// The ReleaseFlags are used in the Release exchange.
type ReleaseFlags uint32

const (
	ReleaseFlush ReleaseFlags = 1 << 0
)

func (fl ReleaseFlags) String() string {
	return flagString(uint32(fl), releaseFlagNames)
}

var releaseFlagNames = []flagName{
	{uint32(ReleaseFlush), "ReleaseFlush"},
}

// Opcodes
const (
	opLookup      = 1
	opForget      = 2 // no reply
	opGetattr     = 3
	opSetattr     = 4
	opReadlink    = 5
	opSymlink     = 6
	opMknod       = 8
	opMkdir       = 9
	opUnlink      = 10
	opRmdir       = 11
	opRename      = 12
	opLink        = 13
	opOpen        = 14
	opRead        = 15
	opWrite       = 16
	opStatfs      = 17
	opRelease     = 18
	opFsync       = 20
	opSetxattr    = 21
	opGetxattr    = 22
	opListxattr   = 23
	opRemovexattr = 24
	opFlush       = 25
	opInit        = 26
	opOpendir     = 27
	opReaddir     = 28
	opReleasedir  = 29
	opFsyncdir    = 30
	opGetlk       = 31
	opSetlk       = 32
	opSetlkw      = 33
	opAccess      = 34
	opCreate      = 35
	opInterrupt   = 36
	opBmap        = 37
	opDestroy     = 38
	opIoctl       = 39 // Linux?
	opPoll        = 40 // Linux?

	// OS X
	opSetvolname = 61
	opGetxtimes  = 62
	opExchange   = 63
)

type entryOut struct {
	Nodeid         uint64 // Inode ID
	Generation     uint64 // Inode generation
	EntryValid     uint64 // Cache timeout for the name
	AttrValid      uint64 // Cache timeout for the attributes
	EntryValidNsec uint32
	AttrValidNsec  uint32
	Attr           attr
}

func entryOutSize(p Protocol) uintptr {
	switch {
	case p.LT(Protocol{7, 9}):
		return unsafe.Offsetof(entryOut{}.Attr) + unsafe.Offsetof(entryOut{}.Attr.Blksize)
	default:
		return unsafe.Sizeof(entryOut{})
	}
}

type forgetIn struct {
	Nlookup uint64
}

type getattrIn struct {
	GetattrFlags uint32
	dummy        uint32
	Fh           uint64
}

type attrOut struct {
	AttrValid     uint64 // Cache timeout for the attributes
	AttrValidNsec uint32
	Dummy         uint32
	Attr          attr
}

func attrOutSize(p Protocol) uintptr {
	switch {
	case p.LT(Protocol{7, 9}):
		return unsafe.Offsetof(attrOut{}.Attr) + unsafe.Offsetof(attrOut{}.Attr.Blksize)
	default:
		return unsafe.Sizeof(attrOut{})
	}
}

// OS X
type getxtimesOut struct {
	Bkuptime     uint64
	Crtime       uint64
	BkuptimeNsec uint32
	CrtimeNsec   uint32
}

type mknodIn struct {
	Mode    uint32
	Rdev    uint32
	Umask   uint32
	padding uint32
	// "filename\x00" follows.
}

func mknodInSize(p Protocol) uintptr {
	switch {
	case p.LT(Protocol{7, 12}):
		return unsafe.Offsetof(mknodIn{}.Umask)
	default:
		return unsafe.Sizeof(mknodIn{})
	}
}

type mkdirIn struct {
	Mode  uint32
	Umask uint32
	// filename follows
}

func mkdirInSize(p Protocol) uintptr {
	switch {
	case p.LT(Protocol{7, 12}):
		return unsafe.Offsetof(mkdirIn{}.Umask) + 4
	default:
		return unsafe.Sizeof(mkdirIn{})
	}
}

type renameIn struct {
	Newdir uint64
	// "oldname\x00newname\x00" follows
}

// OS X
type exchangeIn struct {
	Olddir  uint64
	Newdir  uint64
	Options uint64
}

type linkIn struct {
	Oldnodeid uint64
}

type setattrInCommon struct {
	Valid     uint32
	Padding   uint32
	Fh        uint64
	Size      uint64
	LockOwner uint64 // unused on OS X?
	Atime     uint64
	Mtime     uint64
	Unused2   uint64
	AtimeNsec uint32
	MtimeNsec uint32
	Unused3   uint32
	Mode      uint32
	Unused4   uint32
	Uid       uint32
	Gid       uint32
	Unused5   uint32
}

type openIn struct {
	Flags  uint32
	Unused uint32
}

type openOut struct {
	Fh        uint64
	OpenFlags uint32
	Padding   uint32
}

type createIn struct {
	Flags   uint32
	Mode    uint32
	Umask   uint32
	padding uint32
}

func createInSize(p Protocol) uintptr {
	switch {
	case p.LT(Protocol{7, 12}):
		return unsafe.Offsetof(createIn{}.Umask)
	default:
		return unsafe.Sizeof(createIn{})
	}
}

type releaseIn struct {
	Fh           uint64
	Flags        uint32
	ReleaseFlags uint32
	LockOwner    uint32
}

type flushIn struct {
	Fh         uint64
	FlushFlags uint32
	Padding    uint32
	LockOwner  uint64
}

type readIn struct {
	Fh        uint64
	Offset    uint64
	Size      uint32
	ReadFlags uint32
	LockOwner uint64
	Flags     uint32
	padding   uint32
}

func readInSize(p Protocol) uintptr {
	switch {
	case p.LT(Protocol{7, 9}):
		return unsafe.Offsetof(readIn{}.ReadFlags) + 4
	default:
		return unsafe.Sizeof(readIn{})
	}
}

// The ReadFlags are passed in ReadRequest.
type ReadFlags uint32

const (
	// LockOwner field is valid.
	ReadLockOwner ReadFlags = 1 << 1
)

var readFlagNames = []flagName{
	{uint32(ReadLockOwner), "ReadLockOwner"},
}

func (fl ReadFlags) String() string {
	return flagString(uint32(fl), readFlagNames)
}

type writeIn struct {
	Fh         uint64
	Offset     uint64
	Size       uint32
	WriteFlags uint32
	LockOwner  uint64
	Flags      uint32
	padding    uint32
}

func writeInSize(p Protocol) uintptr {
	switch {
	case p.LT(Protocol{7, 9}):
		return unsafe.Offsetof(writeIn{}.LockOwner)
	default:
		return unsafe.Sizeof(writeIn{})
	}
}

type writeOut struct {
	Size    uint32
	Padding uint32
}

// The WriteFlags are passed in WriteRequest.
type WriteFlags uint32

const (
	WriteCache WriteFlags = 1 << 0
	// LockOwner field is valid.
	WriteLockOwner WriteFlags = 1 << 1
)

var writeFlagNames = []flagName{
	{uint32(WriteCache), "WriteCache"},
	{uint32(WriteLockOwner), "WriteLockOwner"},
}

func (fl WriteFlags) String() string {
	return flagString(uint32(fl), writeFlagNames)
}

const compatStatfsSize = 48

type statfsOut struct {
	St kstatfs
}

type fsyncIn struct {
	Fh         uint64
	FsyncFlags uint32
	Padding    uint32
}

type setxattrInCommon struct {
	Size  uint32
	Flags uint32
}

func (setxattrInCommon) position() uint32 {
	return 0
}

type getxattrInCommon struct {
	Size    uint32
	Padding uint32
}

func (getxattrInCommon) position() uint32 {
	return 0
}

type getxattrOut struct {
	Size    uint32
	Padding uint32
}

type lkIn struct {
	Fh      uint64
	Owner   uint64
	Lk      fileLock
	LkFlags uint32
	padding uint32
}

func lkInSize(p Protocol) uintptr {
	switch {
	case p.LT(Protocol{7, 9}):
		return unsafe.Offsetof(lkIn{}.LkFlags)
	default:
		return unsafe.Sizeof(lkIn{})
	}
}

type lkOut struct {
	Lk fileLock
}

type accessIn struct {
	Mask    uint32
	Padding uint32
}

type initIn struct {
	Major        uint32
	Minor        uint32
	MaxReadahead uint32
	Flags        uint32
}

const initInSize = int(unsafe.Sizeof(initIn{}))

type initOut struct {
	Major        uint32
	Minor        uint32
	MaxReadahead uint32
	Flags        uint32
	Unused       uint32
	MaxWrite     uint32
}

type interruptIn struct {
	Unique uint64
}

type bmapIn struct {
	Block     uint64
	BlockSize uint32
	Padding   uint32
}

type bmapOut struct {
	Block uint64
}

type inHeader struct {
	Len     uint32
	Opcode  uint32
	Unique  uint64
	Nodeid  uint64
	Uid     uint32
	Gid     uint32
	Pid     uint32
	Padding uint32
}

const inHeaderSize = int(unsafe.Sizeof(inHeader{}))

type outHeader struct {
	Len    uint32
	Error  int32
	Unique uint64
}

type dirent struct {
	Ino     uint64
	Off     uint64
	Namelen uint32
	Type    uint32
	Name    [0]byte
}

const direntSize = 8 + 8 + 4 + 4

const (
	notifyCodePoll       int32 = 1
	notifyCodeInvalInode int32 = 2
	notifyCodeInvalEntry int32 = 3
)

type notifyInvalInodeOut struct {
	Ino uint64
	Off int64
	Len int64
}

type notifyInvalEntryOut struct {
	Parent  uint64
	Namelen uint32
	padding uint32
}