include/net/9p/9p.h

   1 /*
   2  * include/net/9p/9p.h
   3  *
   4  * 9P protocol definitions.
   5  *
   6  *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
   7  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   8  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2
  12  *  as published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to:
  21  *  Free Software Foundation
  22  *  51 Franklin Street, Fifth Floor
  23  *  Boston, MA  02111-1301  USA
  24  *
  25  */
  26
  27 #ifndef NET_9P_H
  28 #define NET_9P_H
  29
  30 /**
  31  * enum p9_debug_flags - bits for mount time debug parameter
  32  * @P9_DEBUG_ERROR: more verbose error messages including original error string
  33  * @P9_DEBUG_9P: 9P protocol tracing
  34  * @P9_DEBUG_VFS: VFS API tracing
  35  * @P9_DEBUG_CONV: protocol conversion tracing
  36  * @P9_DEBUG_MUX: trace management of concurrent transactions
  37  * @P9_DEBUG_TRANS: transport tracing
  38  * @P9_DEBUG_SLABS: memory management tracing
  39  * @P9_DEBUG_FCALL: verbose dump of protocol messages
  40  * @P9_DEBUG_FID: fid allocation/deallocation tracking
  41  * @P9_DEBUG_PKT: packet marshalling/unmarshalling
  42  * @P9_DEBUG_FSC: FS-cache tracing
  43  *
  44  * These flags are passed at mount time to turn on various levels of
  45  * verbosity and tracing which will be output to the system logs.
  46  */
  47
  48 enum p9_debug_flags {
  49         P9_DEBUG_ERROR =        (1<<0),
  50         P9_DEBUG_9P =           (1<<2),
  51         P9_DEBUG_VFS =          (1<<3),
  52         P9_DEBUG_CONV =         (1<<4),
  53         P9_DEBUG_MUX =          (1<<5),
  54         P9_DEBUG_TRANS =        (1<<6),
  55         P9_DEBUG_SLABS =        (1<<7),
  56         P9_DEBUG_FCALL =        (1<<8),
  57         P9_DEBUG_FID =          (1<<9),
  58         P9_DEBUG_PKT =          (1<<10),
  59         P9_DEBUG_FSC =          (1<<11),
  60 };
  61
  62 #ifdef CONFIG_NET_9P_DEBUG
  63 extern unsigned int p9_debug_level;
  64
  65 #define P9_DPRINTK(level, format, arg...) \
  66 do {  \
  67         if ((p9_debug_level & level) == level) {\
  68                 if (level == P9_DEBUG_9P) \
  69                         printk(KERN_NOTICE "(%8.8d) " \
  70                         format , task_pid_nr(current) , ## arg); \
  71                 else \
  72                         printk(KERN_NOTICE "-- %s (%d): " \
  73                         format , __func__, task_pid_nr(current) , ## arg); \
  74         } \
  75 } while (0)
  76
  77 #else
  78 #define P9_DPRINTK(level, format, arg...)  do { } while (0)
  79 #endif
  80
  81 #define P9_EPRINTK(level, format, arg...) \
  82 do { \
  83         printk(level "9p: %s (%d): " \
  84                 format , __func__, task_pid_nr(current), ## arg); \
  85 } while (0)
  86
  87 /**
  88  * enum p9_msg_t - 9P message types
  89  * @P9_TSTATFS: file system status request
  90  * @P9_RSTATFS: file system status response
  91  * @P9_TSYMLINK: make symlink request
  92  * @P9_RSYMLINK: make symlink response
  93  * @P9_TMKNOD: create a special file object request
  94  * @P9_RMKNOD: create a special file object response
  95  * @P9_TLCREATE: prepare a handle for I/O on an new file for 9P2000.L
  96  * @P9_RLCREATE: response with file access information for 9P2000.L
  97  * @P9_TRENAME: rename request
  98  * @P9_RRENAME: rename response
  99  * @P9_TMKDIR: create a directory request
 100  * @P9_RMKDIR: create a directory response
 101  * @P9_TVERSION: version handshake request
 102  * @P9_RVERSION: version handshake response
 103  * @P9_TAUTH: request to establish authentication channel
 104  * @P9_RAUTH: response with authentication information
 105  * @P9_TATTACH: establish user access to file service
 106  * @P9_RATTACH: response with top level handle to file hierarchy
 107  * @P9_TERROR: not used
 108  * @P9_RERROR: response for any failed request
 109  * @P9_TFLUSH: request to abort a previous request
 110  * @P9_RFLUSH: response when previous request has been cancelled
 111  * @P9_TWALK: descend a directory hierarchy
 112  * @P9_RWALK: response with new handle for position within hierarchy
 113  * @P9_TOPEN: prepare a handle for I/O on an existing file
 114  * @P9_ROPEN: response with file access information
 115  * @P9_TCREATE: prepare a handle for I/O on a new file
 116  * @P9_RCREATE: response with file access information
 117  * @P9_TREAD: request to transfer data from a file or directory
 118  * @P9_RREAD: response with data requested
 119  * @P9_TWRITE: reuqest to transfer data to a file
 120  * @P9_RWRITE: response with out much data was transfered to file
 121  * @P9_TCLUNK: forget about a handle to an entity within the file system
 122  * @P9_RCLUNK: response when server has forgotten about the handle
 123  * @P9_TREMOVE: request to remove an entity from the hierarchy
 124  * @P9_RREMOVE: response when server has removed the entity
 125  * @P9_TSTAT: request file entity attributes
 126  * @P9_RSTAT: response with file entity attributes
 127  * @P9_TWSTAT: request to update file entity attributes
 128  * @P9_RWSTAT: response when file entity attributes are updated
 129  *
 130  * There are 14 basic operations in 9P2000, paired as
 131  * requests and responses.  The one special case is ERROR
 132  * as there is no @P9_TERROR request for clients to transmit to
 133  * the server, but the server may respond to any other request
 134  * with an @P9_RERROR.
 135  *
 136  * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html
 137  */
 138
 139 enum p9_msg_t {
 140         P9_TSTATFS = 8,
 141         P9_RSTATFS,
 142         P9_TLOPEN = 12,
 143         P9_RLOPEN,
 144         P9_TLCREATE = 14,
 145         P9_RLCREATE,
 146         P9_TSYMLINK = 16,
 147         P9_RSYMLINK,
 148         P9_TMKNOD = 18,
 149         P9_RMKNOD,
 150         P9_TRENAME = 20,
 151         P9_RRENAME,
 152         P9_TGETATTR = 24,
 153         P9_RGETATTR,
 154         P9_TSETATTR = 26,
 155         P9_RSETATTR,
 156         P9_TXATTRWALK = 30,
 157         P9_RXATTRWALK,
 158         P9_TREADDIR = 40,
 159         P9_RREADDIR,
 160         P9_TLINK = 70,
 161         P9_RLINK,
 162         P9_TMKDIR = 72,
 163         P9_RMKDIR,
 164         P9_TVERSION = 100,
 165         P9_RVERSION,
 166         P9_TAUTH = 102,
 167         P9_RAUTH,
 168         P9_TATTACH = 104,
 169         P9_RATTACH,
 170         P9_TERROR = 106,
 171         P9_RERROR,
 172         P9_TFLUSH = 108,
 173         P9_RFLUSH,
 174         P9_TWALK = 110,
 175         P9_RWALK,
 176         P9_TOPEN = 112,
 177         P9_ROPEN,
 178         P9_TCREATE = 114,
 179         P9_RCREATE,
 180         P9_TREAD = 116,
 181         P9_RREAD,
 182         P9_TWRITE = 118,
 183         P9_RWRITE,
 184         P9_TCLUNK = 120,
 185         P9_RCLUNK,
 186         P9_TREMOVE = 122,
 187         P9_RREMOVE,
 188         P9_TSTAT = 124,
 189         P9_RSTAT,
 190         P9_TWSTAT = 126,
 191         P9_RWSTAT,
 192 };
 193
 194 /**
 195  * enum p9_open_mode_t - 9P open modes
 196  * @P9_OREAD: open file for reading only
 197  * @P9_OWRITE: open file for writing only
 198  * @P9_ORDWR: open file for reading or writing
 199  * @P9_OEXEC: open file for execution
 200  * @P9_OTRUNC: truncate file to zero-length before opening it
 201  * @P9_OREXEC: close the file when an exec(2) system call is made
 202  * @P9_ORCLOSE: remove the file when the file is closed
 203  * @P9_OAPPEND: open the file and seek to the end
 204  * @P9_OEXCL: only create a file, do not open it
 205  *
 206  * 9P open modes differ slightly from Posix standard modes.
 207  * In particular, there are extra modes which specify different
 208  * semantic behaviors than may be available on standard Posix
 209  * systems.  For example, @P9_OREXEC and @P9_ORCLOSE are modes that
 210  * most likely will not be issued from the Linux VFS client, but may
 211  * be supported by servers.
 212  *
 213  * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
 214  */
 215
 216 enum p9_open_mode_t {
 217         P9_OREAD = 0x00,
 218         P9_OWRITE = 0x01,
 219         P9_ORDWR = 0x02,
 220         P9_OEXEC = 0x03,
 221         P9_OTRUNC = 0x10,
 222         P9_OREXEC = 0x20,
 223         P9_ORCLOSE = 0x40,
 224         P9_OAPPEND = 0x80,
 225         P9_OEXCL = 0x1000,
 226 };
 227
 228 /**
 229  * enum p9_perm_t - 9P permissions
 230  * @P9_DMDIR: mode bite for directories
 231  * @P9_DMAPPEND: mode bit for is append-only
 232  * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed)
 233  * @P9_DMMOUNT: mode bite for mount points
 234  * @P9_DMAUTH: mode bit for authentication file
 235  * @P9_DMTMP: mode bit for non-backed-up files
 236  * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u)
 237  * @P9_DMLINK: mode bit for hard-link (9P2000.u)
 238  * @P9_DMDEVICE: mode bit for device files (9P2000.u)
 239  * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u)
 240  * @P9_DMSOCKET: mode bit for socket (9P2000.u)
 241  * @P9_DMSETUID: mode bit for setuid (9P2000.u)
 242  * @P9_DMSETGID: mode bit for setgid (9P2000.u)
 243  * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u)
 244  *
 245  * 9P permissions differ slightly from Posix standard modes.
 246  *
 247  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 248  */
 249 enum p9_perm_t {
 250         P9_DMDIR = 0x80000000,
 251         P9_DMAPPEND = 0x40000000,
 252         P9_DMEXCL = 0x20000000,
 253         P9_DMMOUNT = 0x10000000,
 254         P9_DMAUTH = 0x08000000,
 255         P9_DMTMP = 0x04000000,
 256 /* 9P2000.u extensions */
 257         P9_DMSYMLINK = 0x02000000,
 258         P9_DMLINK = 0x01000000,
 259         P9_DMDEVICE = 0x00800000,
 260         P9_DMNAMEDPIPE = 0x00200000,
 261         P9_DMSOCKET = 0x00100000,
 262         P9_DMSETUID = 0x00080000,
 263         P9_DMSETGID = 0x00040000,
 264         P9_DMSETVTX = 0x00010000,
 265 };
 266
 267 /**
 268  * enum p9_qid_t - QID types
 269  * @P9_QTDIR: directory
 270  * @P9_QTAPPEND: append-only
 271  * @P9_QTEXCL: excluse use (only one open handle allowed)
 272  * @P9_QTMOUNT: mount points
 273  * @P9_QTAUTH: authentication file
 274  * @P9_QTTMP: non-backed-up files
 275  * @P9_QTSYMLINK: symbolic links (9P2000.u)
 276  * @P9_QTLINK: hard-link (9P2000.u)
 277  * @P9_QTFILE: normal files
 278  *
 279  * QID types are a subset of permissions - they are primarily
 280  * used to differentiate semantics for a file system entity via
 281  * a jump-table.  Their value is also the most signifigant 16 bits
 282  * of the permission_t
 283  *
 284  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 285  */
 286 enum p9_qid_t {
 287         P9_QTDIR = 0x80,
 288         P9_QTAPPEND = 0x40,
 289         P9_QTEXCL = 0x20,
 290         P9_QTMOUNT = 0x10,
 291         P9_QTAUTH = 0x08,
 292         P9_QTTMP = 0x04,
 293         P9_QTSYMLINK = 0x02,
 294         P9_QTLINK = 0x01,
 295         P9_QTFILE = 0x00,
 296 };
 297
 298 /* 9P Magic Numbers */
 299 #define P9_NOTAG        (u16)(~0)
 300 #define P9_NOFID        (u32)(~0)
 301 #define P9_MAXWELEM     16
 302
 303 /* ample room for Twrite/Rread header */
 304 #define P9_IOHDRSZ      24
 305
 306 /* Room for readdir header */
 307 #define P9_READDIRHDRSZ 24
 308
 309 /**
 310  * struct p9_str - length prefixed string type
 311  * @len: length of the string
 312  * @str: the string
 313  *
 314  * The protocol uses length prefixed strings for all
 315  * string data, so we replicate that for our internal
 316  * string members.
 317  */
 318
 319 struct p9_str {
 320         u16 len;
 321         char *str;
 322 };
 323
 324 /**
 325  * struct p9_qid - file system entity information
 326  * @type: 8-bit type &p9_qid_t
 327  * @version: 16-bit monotonically incrementing version number
 328  * @path: 64-bit per-server-unique ID for a file system element
 329  *
 330  * qids are identifiers used by 9P servers to track file system
 331  * entities.  The type is used to differentiate semantics for operations
 332  * on the entity (ie. read means something different on a directory than
 333  * on a file).  The path provides a server unique index for an entity
 334  * (roughly analogous to an inode number), while the version is updated
 335  * every time a file is modified and can be used to maintain cache
 336  * coherency between clients and serves.
 337  * Servers will often differentiate purely synthetic entities by setting
 338  * their version to 0, signaling that they should never be cached and
 339  * should be accessed synchronously.
 340  *
 341  * See Also://plan9.bell-labs.com/magic/man2html/2/stat
 342  */
 343
 344 struct p9_qid {
 345         u8 type;
 346         u32 version;
 347         u64 path;
 348 };
 349
 350 /**
 351  * struct p9_stat - file system metadata information
 352  * @size: length prefix for this stat structure instance
 353  * @type: the type of the server (equivilent to a major number)
 354  * @dev: the sub-type of the server (equivilent to a minor number)
 355  * @qid: unique id from the server of type &p9_qid
 356  * @mode: Plan 9 format permissions of type &p9_perm_t
 357  * @atime: Last access/read time
 358  * @mtime: Last modify/write time
 359  * @length: file length
 360  * @name: last element of path (aka filename) in type &p9_str
 361  * @uid: owner name in type &p9_str
 362  * @gid: group owner in type &p9_str
 363  * @muid: last modifier in type &p9_str
 364  * @extension: area used to encode extended UNIX support in type &p9_str
 365  * @n_uid: numeric user id of owner (part of 9p2000.u extension)
 366  * @n_gid: numeric group id (part of 9p2000.u extension)
 367  * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension)
 368  *
 369  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 370  */
 371
 372 struct p9_wstat {
 373         u16 size;
 374         u16 type;
 375         u32 dev;
 376         struct p9_qid qid;
 377         u32 mode;
 378         u32 atime;
 379         u32 mtime;
 380         u64 length;
 381         char *name;
 382         char *uid;
 383         char *gid;
 384         char *muid;
 385         char *extension;        /* 9p2000.u extensions */
 386         u32 n_uid;              /* 9p2000.u extensions */
 387         u32 n_gid;              /* 9p2000.u extensions */
 388         u32 n_muid;             /* 9p2000.u extensions */
 389 };
 390
 391 struct p9_stat_dotl {
 392         u64 st_result_mask;
 393         struct p9_qid qid;
 394         u32 st_mode;
 395         u32 st_uid;
 396         u32 st_gid;
 397         u64 st_nlink;
 398         u64 st_rdev;
 399         u64 st_size;
 400         u64 st_blksize;
 401         u64 st_blocks;
 402         u64 st_atime_sec;
 403         u64 st_atime_nsec;
 404         u64 st_mtime_sec;
 405         u64 st_mtime_nsec;
 406         u64 st_ctime_sec;
 407         u64 st_ctime_nsec;
 408         u64 st_btime_sec;
 409         u64 st_btime_nsec;
 410         u64 st_gen;
 411         u64 st_data_version;
 412 };
 413
 414 #define P9_STATS_MODE           0x00000001ULL
 415 #define P9_STATS_NLINK          0x00000002ULL
 416 #define P9_STATS_UID            0x00000004ULL
 417 #define P9_STATS_GID            0x00000008ULL
 418 #define P9_STATS_RDEV           0x00000010ULL
 419 #define P9_STATS_ATIME          0x00000020ULL
 420 #define P9_STATS_MTIME          0x00000040ULL
 421 #define P9_STATS_CTIME          0x00000080ULL
 422 #define P9_STATS_INO            0x00000100ULL
 423 #define P9_STATS_SIZE           0x00000200ULL
 424 #define P9_STATS_BLOCKS         0x00000400ULL
 425
 426 #define P9_STATS_BTIME          0x00000800ULL
 427 #define P9_STATS_GEN            0x00001000ULL
 428 #define P9_STATS_DATA_VERSION   0x00002000ULL
 429
 430 #define P9_STATS_BASIC          0x000007ffULL /* Mask for fields up to BLOCKS */
 431 #define P9_STATS_ALL            0x00003fffULL /* Mask for All fields above */
 432
 433 /**
 434  * struct p9_iattr_dotl - P9 inode attribute for setattr
 435  * @valid: bitfield specifying which fields are valid
 436  *         same as in struct iattr
 437  * @mode: File permission bits
 438  * @uid: user id of owner
 439  * @gid: group id
 440  * @size: File size
 441  * @atime_sec: Last access time, seconds
 442  * @atime_nsec: Last access time, nanoseconds
 443  * @mtime_sec: Last modification time, seconds
 444  * @mtime_nsec: Last modification time, nanoseconds
 445  */
 446
 447 struct p9_iattr_dotl {
 448         u32 valid;
 449         u32 mode;
 450         u32 uid;
 451         u32 gid;
 452         u64 size;
 453         u64 atime_sec;
 454         u64 atime_nsec;
 455         u64 mtime_sec;
 456         u64 mtime_nsec;
 457 };
 458
 459 /* Structures for Protocol Operations */
 460 struct p9_tstatfs {
 461         u32 fid;
 462 };
 463
 464 struct p9_rstatfs {
 465         u32 type;
 466         u32 bsize;
 467         u64 blocks;
 468         u64 bfree;
 469         u64 bavail;
 470         u64 files;
 471         u64 ffree;
 472         u64 fsid;
 473         u32 namelen;
 474 };
 475
 476 struct p9_trename {
 477         u32 fid;
 478         u32 newdirfid;
 479         struct p9_str name;
 480 };
 481
 482 struct p9_rrename {
 483 };
 484
 485 struct p9_tversion {
 486         u32 msize;
 487         struct p9_str version;
 488 };
 489
 490 struct p9_rversion {
 491         u32 msize;
 492         struct p9_str version;
 493 };
 494
 495 struct p9_tauth {
 496         u32 afid;
 497         struct p9_str uname;
 498         struct p9_str aname;
 499         u32 n_uname;            /* 9P2000.u extensions */
 500 };
 501
 502 struct p9_rauth {
 503         struct p9_qid qid;
 504 };
 505
 506 struct p9_rerror {
 507         struct p9_str error;
 508         u32 errno;              /* 9p2000.u extension */
 509 };
 510
 511 struct p9_tflush {
 512         u16 oldtag;
 513 };
 514
 515 struct p9_rflush {
 516 };
 517
 518 struct p9_tattach {
 519         u32 fid;
 520         u32 afid;
 521         struct p9_str uname;
 522         struct p9_str aname;
 523         u32 n_uname;            /* 9P2000.u extensions */
 524 };
 525
 526 struct p9_rattach {
 527         struct p9_qid qid;
 528 };
 529
 530 struct p9_twalk {
 531         u32 fid;
 532         u32 newfid;
 533         u16 nwname;
 534         struct p9_str wnames[16];
 535 };
 536
 537 struct p9_rwalk {
 538         u16 nwqid;
 539         struct p9_qid wqids[16];
 540 };
 541
 542 struct p9_topen {
 543         u32 fid;
 544         u8 mode;
 545 };
 546
 547 struct p9_ropen {
 548         struct p9_qid qid;
 549         u32 iounit;
 550 };
 551
 552 struct p9_tcreate {
 553         u32 fid;
 554         struct p9_str name;
 555         u32 perm;
 556         u8 mode;
 557         struct p9_str extension;
 558 };
 559
 560 struct p9_rcreate {
 561         struct p9_qid qid;
 562         u32 iounit;
 563 };
 564
 565 struct p9_tread {
 566         u32 fid;
 567         u64 offset;
 568         u32 count;
 569 };
 570
 571 struct p9_rread {
 572         u32 count;
 573         u8 *data;
 574 };
 575
 576 struct p9_twrite {
 577         u32 fid;
 578         u64 offset;
 579         u32 count;
 580         u8 *data;
 581 };
 582
 583 struct p9_rwrite {
 584         u32 count;
 585 };
 586
 587 struct p9_treaddir {
 588         u32 fid;
 589         u64 offset;
 590         u32 count;
 591 };
 592
 593 struct p9_rreaddir {
 594         u32 count;
 595         u8 *data;
 596 };
 597
 598
 599 struct p9_tclunk {
 600         u32 fid;
 601 };
 602
 603 struct p9_rclunk {
 604 };
 605
 606 struct p9_tremove {
 607         u32 fid;
 608 };
 609
 610 struct p9_rremove {
 611 };
 612
 613 struct p9_tstat {
 614         u32 fid;
 615 };
 616
 617 struct p9_rstat {
 618         struct p9_wstat stat;
 619 };
 620
 621 struct p9_twstat {
 622         u32 fid;
 623         struct p9_wstat stat;
 624 };
 625
 626 struct p9_rwstat {
 627 };
 628
 629 /**
 630  * struct p9_fcall - primary packet structure
 631  * @size: prefixed length of the structure
 632  * @id: protocol operating identifier of type &p9_msg_t
 633  * @tag: transaction id of the request
 634  * @offset: used by marshalling routines to track currentposition in buffer
 635  * @capacity: used by marshalling routines to track total capacity
 636  * @sdata: payload
 637  *
 638  * &p9_fcall represents the structure for all 9P RPC
 639  * transactions.  Requests are packaged into fcalls, and reponses
 640  * must be extracted from them.
 641  *
 642  * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
 643  */
 644
 645 struct p9_fcall {
 646         u32 size;
 647         u8 id;
 648         u16 tag;
 649
 650         size_t offset;
 651         size_t capacity;
 652
 653         uint8_t *sdata;
 654 };
 655
 656 struct p9_idpool;
 657
 658 int p9_errstr2errno(char *errstr, int len);
 659
 660 struct p9_idpool *p9_idpool_create(void);
 661 void p9_idpool_destroy(struct p9_idpool *);
 662 int p9_idpool_get(struct p9_idpool *p);
 663 void p9_idpool_put(int id, struct p9_idpool *p);
 664 int p9_idpool_check(int id, struct p9_idpool *p);
 665
 666 int p9_error_init(void);
 667 int p9_errstr2errno(char *, int);
 668 int p9_trans_fd_init(void);
 669 void p9_trans_fd_exit(void);
 670 #endif /* NET_9P_H */