aboutsummaryrefslogtreecommitdiff
path: root/include/net/9p/9p.h
blob: 6b75a6971346a0495fca172e83edce6861a42f12 (plain)
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
/*
 * include/net/9p/9p.h
 *
 * 9P protocol definitions.
 *
 *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#ifndef NET_9P_H
#define NET_9P_H

/**
 * enum p9_debug_flags - bits for mount time debug parameter
 * @P9_DEBUG_ERROR: more verbose error messages including original error string
 * @P9_DEBUG_9P: 9P protocol tracing
 * @P9_DEBUG_VFS: VFS API tracing
 * @P9_DEBUG_CONV: protocol conversion tracing
 * @P9_DEBUG_MUX: trace management of concurrent transactions
 * @P9_DEBUG_TRANS: transport tracing
 * @P9_DEBUG_SLABS: memory management tracing
 * @P9_DEBUG_FCALL: verbose dump of protocol messages
 * @P9_DEBUG_FID: fid allocation/deallocation tracking
 * @P9_DEBUG_PKT: packet marshalling/unmarshalling
 * @P9_DEBUG_FSC: FS-cache tracing
 *
 * These flags are passed at mount time to turn on various levels of
 * verbosity and tracing which will be output to the system logs.
 */

enum p9_debug_flags {
	P9_DEBUG_ERROR = 	(1<<0),
	P9_DEBUG_9P = 		(1<<2),
	P9_DEBUG_VFS =		(1<<3),
	P9_DEBUG_CONV =		(1<<4),
	P9_DEBUG_MUX =		(1<<5),
	P9_DEBUG_TRANS =	(1<<6),
	P9_DEBUG_SLABS =      	(1<<7),
	P9_DEBUG_FCALL =	(1<<8),
	P9_DEBUG_FID =		(1<<9),
	P9_DEBUG_PKT =		(1<<10),
	P9_DEBUG_FSC =		(1<<11),
};

#ifdef CONFIG_NET_9P_DEBUG
extern unsigned int p9_debug_level;

#define P9_DPRINTK(level, format, arg...) \
do {  \
	if ((p9_debug_level & level) == level) {\
		if (level == P9_DEBUG_9P) \
			printk(KERN_NOTICE "(%8.8d) " \
			format , task_pid_nr(current) , ## arg); \
		else \
			printk(KERN_NOTICE "-- %s (%d): " \
			format , __func__, task_pid_nr(current) , ## arg); \
	} \
} while (0)

#else
#define P9_DPRINTK(level, format, arg...)  do { } while (0)
#endif

#define P9_EPRINTK(level, format, arg...) \
do { \
	printk(level "9p: %s (%d): " \
		format , __func__, task_pid_nr(current), ## arg); \
} while (0)

/**
 * enum p9_msg_t - 9P message types
 * @P9_TLERROR: not used
 * @P9_RLERROR: response for any failed request for 9P2000.L
 * @P9_TSTATFS: file system status request
 * @P9_RSTATFS: file system status response
 * @P9_TSYMLINK: make symlink request
 * @P9_RSYMLINK: make symlink response
 * @P9_TMKNOD: create a special file object request
 * @P9_RMKNOD: create a special file object response
 * @P9_TLCREATE: prepare a handle for I/O on an new file for 9P2000.L
 * @P9_RLCREATE: response with file access information for 9P2000.L
 * @P9_TRENAME: rename request
 * @P9_RRENAME: rename response
 * @P9_TMKDIR: create a directory request
 * @P9_RMKDIR: create a directory response
 * @P9_TVERSION: version handshake request
 * @P9_RVERSION: version handshake response
 * @P9_TAUTH: request to establish authentication channel
 * @P9_RAUTH: response with authentication information
 * @P9_TATTACH: establish user access to file service
 * @P9_RATTACH: response with top level handle to file hierarchy
 * @P9_TERROR: not used
 * @P9_RERROR: response for any failed request
 * @P9_TFLUSH: request to abort a previous request
 * @P9_RFLUSH: response when previous request has been cancelled
 * @P9_TWALK: descend a directory hierarchy
 * @P9_RWALK: response with new handle for position within hierarchy
 * @P9_TOPEN: prepare a handle for I/O on an existing file
 * @P9_ROPEN: response with file access information
 * @P9_TCREATE: prepare a handle for I/O on a new file
 * @P9_RCREATE: response with file access information
 * @P9_TREAD: request to transfer data from a file or directory
 * @P9_RREAD: response with data requested
 * @P9_TWRITE: reuqest to transfer data to a file
 * @P9_RWRITE: response with out much data was transfered to file
 * @P9_TCLUNK: forget about a handle to an entity within the file system
 * @P9_RCLUNK: response when server has forgotten about the handle
 * @P9_TREMOVE: request to remove an entity from the hierarchy
 * @P9_RREMOVE: response when server has removed the entity
 * @P9_TSTAT: request file entity attributes
 * @P9_RSTAT: response with file entity attributes
 * @P9_TWSTAT: request to update file entity attributes
 * @P9_RWSTAT: response when file entity attributes are updated
 *
 * There are 14 basic operations in 9P2000, paired as
 * requests and responses.  The one special case is ERROR
 * as there is no @P9_TERROR request for clients to transmit to
 * the server, but the server may respond to any other request
 * with an @P9_RERROR.
 *
 * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html
 */

enum p9_msg_t {
	P9_TSYNCFS = 0,
	P9_RSYNCFS,
	P9_TLERROR = 6,
	P9_RLERROR,
	P9_TSTATFS = 8,
	P9_RSTATFS,
	P9_TLOPEN = 12,
	P9_RLOPEN,
	P9_TLCREATE = 14,
	P9_RLCREATE,
	P9_TSYMLINK = 16,
	P9_RSYMLINK,
	P9_TMKNOD = 18,
	P9_RMKNOD,
	P9_TRENAME = 20,
	P9_RRENAME,
	P9_TREADLINK = 22,
	P9_RREADLINK,
	P9_TGETATTR = 24,
	P9_RGETATTR,
	P9_TSETATTR = 26,
	P9_RSETATTR,
	P9_TXATTRWALK = 30,
	P9_RXATTRWALK,
	P9_TXATTRCREATE = 32,
	P9_RXATTRCREATE,
	P9_TREADDIR = 40,
	P9_RREADDIR,
	P9_TFSYNC = 50,
	P9_RFSYNC,
	P9_TLOCK = 52,
	P9_RLOCK,
	P9_TGETLOCK = 54,
	P9_RGETLOCK,
	P9_TLINK = 70,
	P9_RLINK,
	P9_TMKDIR = 72,
	P9_RMKDIR,
	P9_TVERSION = 100,
	P9_RVERSION,
	P9_TAUTH = 102,
	P9_RAUTH,
	P9_TATTACH = 104,
	P9_RATTACH,
	P9_TERROR = 106,
	P9_RERROR,
	P9_TFLUSH = 108,
	P9_RFLUSH,
	P9_TWALK = 110,
	P9_RWALK,
	P9_TOPEN = 112,
	P9_ROPEN,
	P9_TCREATE = 114,
	P9_RCREATE,
	P9_TREAD = 116,
	P9_RREAD,
	P9_TWRITE = 118,
	P9_RWRITE,
	P9_TCLUNK = 120,
	P9_RCLUNK,
	P9_TREMOVE = 122,
	P9_RREMOVE,
	P9_TSTAT = 124,
	P9_RSTAT,
	P9_TWSTAT = 126,
	P9_RWSTAT,
};

/**
 * enum p9_open_mode_t - 9P open modes
 * @P9_OREAD: open file for reading only
 * @P9_OWRITE: open file for writing only
 * @P9_ORDWR: open file for reading or writing
 * @P9_OEXEC: open file for execution
 * @P9_OTRUNC: truncate file to zero-length before opening it
 * @P9_OREXEC: close the file when an exec(2) system call is made
 * @P9_ORCLOSE: remove the file when the file is closed
 * @P9_OAPPEND: open the file and seek to the end
 * @P9_OEXCL: only create a file, do not open it
 *
 * 9P open modes differ slightly from Posix standard modes.
 * In particular, there are extra modes which specify different
 * semantic behaviors than may be available on standard Posix
 * systems.  For example, @P9_OREXEC and @P9_ORCLOSE are modes that
 * most likely will not be issued from the Linux VFS client, but may
 * be supported by servers.
 *
 * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
 */

enum p9_open_mode_t {
	P9_OREAD = 0x00,
	P9_OWRITE = 0x01,
	P9_ORDWR = 0x02,
	P9_OEXEC = 0x03,
	P9_OTRUNC = 0x10,
	P9_OREXEC = 0x20,
	P9_ORCLOSE = 0x40,
	P9_OAPPEND = 0x80,
	P9_OEXCL = 0x1000,
};

/**
 * enum p9_perm_t - 9P permissions
 * @P9_DMDIR: mode bite for directories
 * @P9_DMAPPEND: mode bit for is append-only
 * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed)
 * @P9_DMMOUNT: mode bite for mount points
 * @P9_DMAUTH: mode bit for authentication file
 * @P9_DMTMP: mode bit for non-backed-up files
 * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u)
 * @P9_DMLINK: mode bit for hard-link (9P2000.u)
 * @P9_DMDEVICE: mode bit for device files (9P2000.u)
 * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u)
 * @P9_DMSOCKET: mode bit for socket (9P2000.u)
 * @P9_DMSETUID: mode bit for setuid (9P2000.u)
 * @P9_DMSETGID: mode bit for setgid (9P2000.u)
 * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u)
 *
 * 9P permissions differ slightly from Posix standard modes.
 *
 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 */
enum p9_perm_t {
	P9_DMDIR = 0x80000000,
	P9_DMAPPEND = 0x40000000,
	P9_DMEXCL = 0x20000000,
	P9_DMMOUNT = 0x10000000,
	P9_DMAUTH = 0x08000000,
	P9_DMTMP = 0x04000000,
/* 9P2000.u extensions */
	P9_DMSYMLINK = 0x02000000,
	P9_DMLINK = 0x01000000,
	P9_DMDEVICE = 0x00800000,
	P9_DMNAMEDPIPE = 0x00200000,
	P9_DMSOCKET = 0x00100000,
	P9_DMSETUID = 0x00080000,
	P9_DMSETGID = 0x00040000,
	P9_DMSETVTX = 0x00010000,
};

/**
 * enum p9_qid_t - QID types
 * @P9_QTDIR: directory
 * @P9_QTAPPEND: append-only
 * @P9_QTEXCL: excluse use (only one open handle allowed)
 * @P9_QTMOUNT: mount points
 * @P9_QTAUTH: authentication file
 * @P9_QTTMP: non-backed-up files
 * @P9_QTSYMLINK: symbolic links (9P2000.u)
 * @P9_QTLINK: hard-link (9P2000.u)
 * @P9_QTFILE: normal files
 *
 * QID types are a subset of permissions - they are primarily
 * used to differentiate semantics for a file system entity via
 * a jump-table.  Their value is also the most signifigant 16 bits
 * of the permission_t
 *
 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 */
enum p9_qid_t {
	P9_QTDIR = 0x80,
	P9_QTAPPEND = 0x40,
	P9_QTEXCL = 0x20,
	P9_QTMOUNT = 0x10,
	P9_QTAUTH = 0x08,
	P9_QTTMP = 0x04,
	P9_QTSYMLINK = 0x02,
	P9_QTLINK = 0x01,
	P9_QTFILE = 0x00,
};

/* 9P Magic Numbers */
#define P9_NOTAG	(u16)(~0)
#define P9_NOFID	(u32)(~0)
#define P9_MAXWELEM	16

/* ample room for Twrite/Rread header */
#define P9_IOHDRSZ	24

/* Room for readdir header */
#define P9_READDIRHDRSZ	24

/**
 * struct p9_str - length prefixed string type
 * @len: length of the string
 * @str: the string
 *
 * The protocol uses length prefixed strings for all
 * string data, so we replicate that for our internal
 * string members.
 */

struct p9_str {
	u16 len;
	char *str;
};

/**
 * struct p9_qid - file system entity information
 * @type: 8-bit type &p9_qid_t
 * @version: 16-bit monotonically incrementing version number
 * @path: 64-bit per-server-unique ID for a file system element
 *
 * qids are identifiers used by 9P servers to track file system
 * entities.  The type is used to differentiate semantics for operations
 * on the entity (ie. read means something different on a directory than
 * on a file).  The path provides a server unique index for an entity
 * (roughly analogous to an inode number), while the version is updated
 * every time a file is modified and can be used to maintain cache
 * coherency between clients and serves.
 * Servers will often differentiate purely synthetic entities by setting
 * their version to 0, signaling that they should never be cached and
 * should be accessed synchronously.
 *
 * See Also://plan9.bell-labs.com/magic/man2html/2/stat
 */

struct p9_qid {
	u8 type;
	u32 version;
	u64 path;
};

/**
 * struct p9_stat - file system metadata information
 * @size: length prefix for this stat structure instance
 * @type: the type of the server (equivilent to a major number)
 * @dev: the sub-type of the server (equivilent to a minor number)
 * @qid: unique id from the server of type &p9_qid
 * @mode: Plan 9 format permissions of type &p9_perm_t
 * @atime: Last access/read time
 * @mtime: Last modify/write time
 * @length: file length
 * @name: last element of path (aka filename) in type &p9_str
 * @uid: owner name in type &p9_str
 * @gid: group owner in type &p9_str
 * @muid: last modifier in type &p9_str
 * @extension: area used to encode extended UNIX support in type &p9_str
 * @n_uid: numeric user id of owner (part of 9p2000.u extension)
 * @n_gid: numeric group id (part of 9p2000.u extension)
 * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension)
 *
 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 */

struct p9_wstat {
	u16 size;
	u16 type;
	u32 dev;
	struct p9_qid qid;
	u32 mode;
	u32 atime;
	u32 mtime;
	u64 length;
	char *name;
	char *uid;
	char *gid;
	char *muid;
	char *extension;	/* 9p2000.u extensions */
	u32 n_uid;		/* 9p2000.u extensions */
	u32 n_gid;		/* 9p2000.u extensions */
	u32 n_muid;		/* 9p2000.u extensions */
};

struct p9_stat_dotl {
	u64 st_result_mask;
	struct p9_qid qid;
	u32 st_mode;
	u32 st_uid;
	u32 st_gid;
	u64 st_nlink;
	u64 st_rdev;
	u64 st_size;
	u64 st_blksize;
	u64 st_blocks;
	u64 st_atime_sec;
	u64 st_atime_nsec;
	u64 st_mtime_sec;
	u64 st_mtime_nsec;
	u64 st_ctime_sec;
	u64 st_ctime_nsec;
	u64 st_btime_sec;
	u64 st_btime_nsec;
	u64 st_gen;
	u64 st_data_version;
};

#define P9_STATS_MODE		0x00000001ULL
#define P9_STATS_NLINK		0x00000002ULL
#define P9_STATS_UID		0x00000004ULL
#define P9_STATS_GID		0x00000008ULL
#define P9_STATS_RDEV		0x00000010ULL
#define P9_STATS_ATIME		0x00000020ULL
#define P9_STATS_MTIME		0x00000040ULL
#define P9_STATS_CTIME		0x00000080ULL
#define P9_STATS_INO		0x00000100ULL
#define P9_STATS_SIZE		0x00000200ULL
#define P9_STATS_BLOCKS		0x00000400ULL

#define P9_STATS_BTIME		0x00000800ULL
#define P9_STATS_GEN		0x00001000ULL
#define P9_STATS_DATA_VERSION	0x00002000ULL

#define P9_STATS_BASIC		0x000007ffULL /* Mask for fields up to BLOCKS */
#define P9_STATS_ALL		0x00003fffULL /* Mask for All fields above */

/**
 * struct p9_iattr_dotl - P9 inode attribute for setattr
 * @valid: bitfield specifying which fields are valid
 *         same as in struct iattr
 * @mode: File permission bits
 * @uid: user id of owner
 * @gid: group id
 * @size: File size
 * @atime_sec: Last access time, seconds
 * @atime_nsec: Last access time, nanoseconds
 * @mtime_sec: Last modification time, seconds
 * @mtime_nsec: Last modification time, nanoseconds
 */

struct p9_iattr_dotl {
	u32 valid;
	u32 mode;
	u32 uid;
	u32 gid;
	u64 size;
	u64 atime_sec;
	u64 atime_nsec;
	u64 mtime_sec;
	u64 mtime_nsec;
};

#define P9_LOCK_SUCCESS 0
#define P9_LOCK_BLOCKED 1
#define P9_LOCK_ERROR 2
#define P9_LOCK_GRACE 3

#define P9_LOCK_FLAGS_BLOCK 1
#define P9_LOCK_FLAGS_RECLAIM 2

/* struct p9_flock: POSIX lock structure
 * @type - type of lock
 * @flags - lock flags
 * @start - starting offset of the lock
 * @length - number of bytes
 * @proc_id - process id which wants to take lock
 * @client_id - client id
 */

struct p9_flock {
	u8 type;
	u32 flags;
	u64 start;
	u64 length;
	u32 proc_id;
	char *client_id;
};

/* struct p9_getlock: getlock structure
 * @type - type of lock
 * @start - starting offset of the lock
 * @length - number of bytes
 * @proc_id - process id which wants to take lock
 * @client_id - client id
 */

struct p9_getlock {
	u8 type;
	u64 start;
	u64 length;
	u32 proc_id;
	char *client_id;
};

/* Structures for Protocol Operations */
struct p9_tstatfs {
	u32 fid;
};

struct p9_rstatfs {
	u32 type;
	u32 bsize;
	u64 blocks;
	u64 bfree;
	u64 bavail;
	u64 files;
	u64 ffree;
	u64 fsid;
	u32 namelen;
};

struct p9_trename {
	u32 fid;
	u32 newdirfid;
	struct p9_str name;
};

struct p9_rrename {
};

struct p9_tversion {
	u32 msize;
	struct p9_str version;
};

struct p9_rversion {
	u32 msize;
	struct p9_str version;
};

struct p9_tauth {
	u32 afid;
	struct p9_str uname;
	struct p9_str aname;
	u32 n_uname;		/* 9P2000.u extensions */
};

struct p9_rauth {
	struct p9_qid qid;
};

struct p9_rerror {
	struct p9_str error;
	u32 errno;		/* 9p2000.u extension */
};

struct p9_tflush {
	u16 oldtag;
};

struct p9_rflush {
};

struct p9_tattach {
	u32 fid;
	u32 afid;
	struct p9_str uname;
	struct p9_str aname;
	u32 n_uname;		/* 9P2000.u extensions */
};

struct p9_rattach {
	struct p9_qid qid;
};

struct p9_twalk {
	u32 fid;
	u32 newfid;
	u16 nwname;
	struct p9_str wnames[16];
};

struct p9_rwalk {
	u16 nwqid;
	struct p9_qid wqids[16];
};

struct p9_topen {
	u32 fid;
	u8 mode;
};

struct p9_ropen {
	struct p9_qid qid;
	u32 iounit;
};

struct p9_tcreate {
	u32 fid;
	struct p9_str name;
	u32 perm;
	u8 mode;
	struct p9_str extension;
};

struct p9_rcreate {
	struct p9_qid qid;
	u32 iounit;
};

struct p9_tread {
	u32 fid;
	u64 offset;
	u32 count;
};

struct p9_rread {
	u32 count;
	u8 *data;
};

struct p9_twrite {
	u32 fid;
	u64 offset;
	u32 count;
	u8 *data;
};

struct p9_rwrite {
	u32 count;
};

struct p9_treaddir {
	u32 fid;
	u64 offset;
	u32 count;
};

struct p9_rreaddir {
	u32 count;
	u8 *data;
};


struct p9_tclunk {
	u32 fid;
};

struct p9_rclunk {
};

struct p9_tremove {
	u32 fid;
};

struct p9_rremove {
};

struct p9_tstat {
	u32 fid;
};

struct p9_rstat {
	struct p9_wstat stat;
};

struct p9_twstat {
	u32 fid;
	struct p9_wstat stat;
};

struct p9_rwstat {
};

/**
 * struct p9_fcall - primary packet structure
 * @size: prefixed length of the structure
 * @id: protocol operating identifier of type &p9_msg_t
 * @tag: transaction id of the request
 * @offset: used by marshalling routines to track currentposition in buffer
 * @capacity: used by marshalling routines to track total malloc'd capacity
 * @pubuf: Payload user buffer given by the caller
 * @pubuf: Payload kernel buffer given by the caller
 * @pbuf_size: pubuf/pkbuf(only one will be !NULL) size to be read/write.
 * @private: For transport layer's use.
 * @sdata: payload
 *
 * &p9_fcall represents the structure for all 9P RPC
 * transactions.  Requests are packaged into fcalls, and reponses
 * must be extracted from them.
 *
 * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
 */

struct p9_fcall {
	u32 size;
	u8 id;
	u16 tag;

	size_t offset;
	size_t capacity;
	char __user *pubuf;
	char *pkbuf;
	size_t pbuf_size;
	void *private;

	uint8_t *sdata;
};

struct p9_idpool;

int p9_errstr2errno(char *errstr, int len);

struct p9_idpool *p9_idpool_create(void);
void p9_idpool_destroy(struct p9_idpool *);
int p9_idpool_get(struct p9_idpool *p);
void p9_idpool_put(int id, struct p9_idpool *p);
int p9_idpool_check(int id, struct p9_idpool *p);

int p9_error_init(void);
int p9_errstr2errno(char *, int);
int p9_trans_fd_init(void);
void p9_trans_fd_exit(void);
#endif /* NET_9P_H */