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_TXATTRCREATE = 32,
 159         P9_RXATTRCREATE,
 160         P9_TREADDIR = 40,
 161         P9_RREADDIR,
 162         P9_TLINK = 70,
 163         P9_RLINK,
 164         P9_TMKDIR = 72,
 165         P9_RMKDIR,
 166         P9_TVERSION = 100,
 167         P9_RVERSION,
 168         P9_TAUTH = 102,
 169         P9_RAUTH,
 170         P9_TATTACH = 104,
 171         P9_RATTACH,
 172         P9_TERROR = 106,
 173         P9_RERROR,
 174         P9_TFLUSH = 108,
 175         P9_RFLUSH,
 176         P9_TWALK = 110,
 177         P9_RWALK,
 178         P9_TOPEN = 112,
 179         P9_ROPEN,
 180         P9_TCREATE = 114,
 181         P9_RCREATE,
 182         P9_TREAD = 116,
 183         P9_RREAD,
 184         P9_TWRITE = 118,
 185         P9_RWRITE,
 186         P9_TCLUNK = 120,
 187         P9_RCLUNK,
 188         P9_TREMOVE = 122,
 189         P9_RREMOVE,
 190         P9_TSTAT = 124,
 191         P9_RSTAT,
 192         P9_TWSTAT = 126,
 193         P9_RWSTAT,
 194 };
 195
 196 /**
 197  * enum p9_open_mode_t - 9P open modes
 198  * @P9_OREAD: open file for reading only
 199  * @P9_OWRITE: open file for writing only
 200  * @P9_ORDWR: open file for reading or writing
 201  * @P9_OEXEC: open file for execution
 202  * @P9_OTRUNC: truncate file to zero-length before opening it
 203  * @P9_OREXEC: close the file when an exec(2) system call is made
 204  * @P9_ORCLOSE: remove the file when the file is closed
 205  * @P9_OAPPEND: open the file and seek to the end
 206  * @P9_OEXCL: only create a file, do not open it
 207  *
 208  * 9P open modes differ slightly from Posix standard modes.
 209  * In particular, there are extra modes which specify different
 210  * semantic behaviors than may be available on standard Posix
 211  * systems.  For example, @P9_OREXEC and @P9_ORCLOSE are modes that
 212  * most likely will not be issued from the Linux VFS client, but may
 213  * be supported by servers.
 214  *
 215  * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
 216  */
 217
 218 enum p9_open_mode_t {
 219         P9_OREAD = 0x00,
 220         P9_OWRITE = 0x01,
 221         P9_ORDWR = 0x02,
 222         P9_OEXEC = 0x03,
 223         P9_OTRUNC = 0x10,
 224         P9_OREXEC = 0x20,
 225         P9_ORCLOSE = 0x40,
 226         P9_OAPPEND = 0x80,
 227         P9_OEXCL = 0x1000,
 228 };
 229
 230 /**
 231  * enum p9_perm_t - 9P permissions
 232  * @P9_DMDIR: mode bite for directories
 233  * @P9_DMAPPEND: mode bit for is append-only
 234  * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed)
 235  * @P9_DMMOUNT: mode bite for mount points
 236  * @P9_DMAUTH: mode bit for authentication file
 237  * @P9_DMTMP: mode bit for non-backed-up files
 238  * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u)
 239  * @P9_DMLINK: mode bit for hard-link (9P2000.u)
 240  * @P9_DMDEVICE: mode bit for device files (9P2000.u)
 241  * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u)
 242  * @P9_DMSOCKET: mode bit for socket (9P2000.u)
 243  * @P9_DMSETUID: mode bit for setuid (9P2000.u)
 244  * @P9_DMSETGID: mode bit for setgid (9P2000.u)
 245  * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u)
 246  *
 247  * 9P permissions differ slightly from Posix standard modes.
 248  *
 249  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 250  */
 251 enum p9_perm_t {
 252         P9_DMDIR = 0x80000000,
 253         P9_DMAPPEND = 0x40000000,
 254         P9_DMEXCL = 0x20000000,
 255         P9_DMMOUNT = 0x10000000,
 256         P9_DMAUTH = 0x08000000,
 257         P9_DMTMP = 0x04000000,
 258 /* 9P2000.u extensions */
 259         P9_DMSYMLINK = 0x02000000,
 260         P9_DMLINK = 0x01000000,
 261         P9_DMDEVICE = 0x00800000,
 262         P9_DMNAMEDPIPE = 0x00200000,
 263         P9_DMSOCKET = 0x00100000,
 264         P9_DMSETUID = 0x00080000,
 265         P9_DMSETGID = 0x00040000,
 266         P9_DMSETVTX = 0x00010000,
 267 };
 268
 269 /**
 270  * enum p9_qid_t - QID types
 271  * @P9_QTDIR: directory
 272  * @P9_QTAPPEND: append-only
 273  * @P9_QTEXCL: excluse use (only one open handle allowed)
 274  * @P9_QTMOUNT: mount points
 275  * @P9_QTAUTH: authentication file
 276  * @P9_QTTMP: non-backed-up files
 277  * @P9_QTSYMLINK: symbolic links (9P2000.u)
 278  * @P9_QTLINK: hard-link (9P2000.u)
 279  * @P9_QTFILE: normal files
 280  *
 281  * QID types are a subset of permissions - they are primarily
 282  * used to differentiate semantics for a file system entity via
 283  * a jump-table.  Their value is also the most signifigant 16 bits
 284  * of the permission_t
 285  *
 286  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 287  */
 288 enum p9_qid_t {
 289         P9_QTDIR = 0x80,
 290         P9_QTAPPEND = 0x40,
 291         P9_QTEXCL = 0x20,
 292         P9_QTMOUNT = 0x10,
 293         P9_QTAUTH = 0x08,
 294         P9_QTTMP = 0x04,
 295         P9_QTSYMLINK = 0x02,
 296         P9_QTLINK = 0x01,
 297         P9_QTFILE = 0x00,
 298 };
 299
 300 /* 9P Magic Numbers */
 301 #define P9_NOTAG        (u16)(~0)
 302 #define P9_NOFID        (u32)(~0)
 303 #define P9_MAXWELEM     16
 304
 305 /* ample room for Twrite/Rread header */
 306 #define P9_IOHDRSZ      24
 307
 308 /* Room for readdir header */
 309 #define P9_READDIRHDRSZ 24
 310
 311 /**
 312  * struct p9_str - length prefixed string type
 313  * @len: length of the string
 314  * @str: the string
 315  *
 316  * The protocol uses length prefixed strings for all
 317  * string data, so we replicate that for our internal
 318  * string members.
 319  */
 320
 321 struct p9_str {
 322         u16 len;
 323         char *str;
 324 };
 325
 326 /**
 327  * struct p9_qid - file system entity information
 328  * @type: 8-bit type &p9_qid_t
 329  * @version: 16-bit monotonically incrementing version number
 330  * @path: 64-bit per-server-unique ID for a file system element
 331  *
 332  * qids are identifiers used by 9P servers to track file system
 333  * entities.  The type is used to differentiate semantics for operations
 334  * on the entity (ie. read means something different on a directory than
 335  * on a file).  The path provides a server unique index for an entity
 336  * (roughly analogous to an inode number), while the version is updated
 337  * every time a file is modified and can be used to maintain cache
 338  * coherency between clients and serves.
 339  * Servers will often differentiate purely synthetic entities by setting
 340  * their version to 0, signaling that they should never be cached and
 341  * should be accessed synchronously.
 342  *
 343  * See Also://plan9.bell-labs.com/magic/man2html/2/stat
 344  */
 345
 346 struct p9_qid {
 347         u8 type;
 348         u32 version;
 349         u64 path;
 350 };
 351
 352 /**
 353  * struct p9_stat - file system metadata information
 354  * @size: length prefix for this stat structure instance
 355  * @type: the type of the server (equivilent to a major number)
 356  * @dev: the sub-type of the server (equivilent to a minor number)
 357  * @qid: unique id from the server of type &p9_qid
 358  * @mode: Plan 9 format permissions of type &p9_perm_t
 359  * @atime: Last access/read time
 360  * @mtime: Last modify/write time
 361  * @length: file length
 362  * @name: last element of path (aka filename) in type &p9_str
 363  * @uid: owner name in type &p9_str
 364  * @gid: group owner in type &p9_str
 365  * @muid: last modifier in type &p9_str
 366  * @extension: area used to encode extended UNIX support in type &p9_str
 367  * @n_uid: numeric user id of owner (part of 9p2000.u extension)
 368  * @n_gid: numeric group id (part of 9p2000.u extension)
 369  * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension)
 370  *
 371  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 372  */
 373
 374 struct p9_wstat {
 375         u16 size;
 376         u16 type;
 377         u32 dev;
 378         struct p9_qid qid;
 379         u32 mode;
 380         u32 atime;
 381         u32 mtime;
 382         u64 length;
 383         char *name;
 384         char *uid;
 385         char *gid;
 386         char *muid;
 387         char *extension;        /* 9p2000.u extensions */
 388         u32 n_uid;              /* 9p2000.u extensions */
 389         u32 n_gid;              /* 9p2000.u extensions */
 390         u32 n_muid;             /* 9p2000.u extensions */
 391 };
 392
 393 struct p9_stat_dotl {
 394         u64 st_result_mask;
 395         struct p9_qid qid;
 396         u32 st_mode;
 397         u32 st_uid;
 398         u32 st_gid;
 399         u64 st_nlink;
 400         u64 st_rdev;
 401         u64 st_size;
 402         u64 st_blksize;
 403         u64 st_blocks;
 404         u64 st_atime_sec;
 405         u64 st_atime_nsec;
 406         u64 st_mtime_sec;
 407         u64 st_mtime_nsec;
 408         u64 st_ctime_sec;
 409         u64 st_ctime_nsec;
 410         u64 st_btime_sec;
 411         u64 st_btime_nsec;
 412         u64 st_gen;
 413         u64 st_data_version;
 414 };
 415
 416 #define P9_STATS_MODE           0x00000001ULL
 417 #define P9_STATS_NLINK          0x00000002ULL
 418 #define P9_STATS_UID            0x00000004ULL
 419 #define P9_STATS_GID            0x00000008ULL
 420 #define P9_STATS_RDEV           0x00000010ULL
 421 #define P9_STATS_ATIME          0x00000020ULL
 422 #define P9_STATS_MTIME          0x00000040ULL
 423 #define P9_STATS_CTIME          0x00000080ULL
 424 #define P9_STATS_INO            0x00000100ULL
 425 #define P9_STATS_SIZE           0x00000200ULL
 426 #define P9_STATS_BLOCKS         0x00000400ULL
 427
 428 #define P9_STATS_BTIME          0x00000800ULL
 429 #define P9_STATS_GEN            0x00001000ULL
 430 #define P9_STATS_DATA_VERSION   0x00002000ULL
 431
 432 #define P9_STATS_BASIC          0x000007ffULL /* Mask for fields up to BLOCKS */
 433 #define P9_STATS_ALL            0x00003fffULL /* Mask for All fields above */
 434
 435 /**
 436  * struct p9_iattr_dotl - P9 inode attribute for setattr
 437  * @valid: bitfield specifying which fields are valid
 438  *         same as in struct iattr
 439  * @mode: File permission bits
 440  * @uid: user id of owner
 441  * @gid: group id
 442  * @size: File size
 443  * @atime_sec: Last access time, seconds
 444  * @atime_nsec: Last access time, nanoseconds
 445  * @mtime_sec: Last modification time, seconds
 446  * @mtime_nsec: Last modification time, nanoseconds
 447  */
 448
 449 struct p9_iattr_dotl {
 450         u32 valid;
 451         u32 mode;
 452         u32 uid;
 453         u32 gid;
 454         u64 size;
 455         u64 atime_sec;
 456         u64 atime_nsec;
 457         u64 mtime_sec;
 458         u64 mtime_nsec;
 459 };
 460
 461 /* Structures for Protocol Operations */
 462 struct p9_tstatfs {
 463         u32 fid;
 464 };
 465
 466 struct p9_rstatfs {
 467         u32 type;
 468         u32 bsize;
 469         u64 blocks;
 470         u64 bfree;
 471         u64 bavail;
 472         u64 files;
 473         u64 ffree;
 474         u64 fsid;
 475         u32 namelen;
 476 };
 477
 478 struct p9_trename {
 479         u32 fid;
 480         u32 newdirfid;
 481         struct p9_str name;
 482 };
 483
 484 struct p9_rrename {
 485 };
 486
 487 struct p9_tversion {
 488         u32 msize;
 489         struct p9_str version;
 490 };
 491
 492 struct p9_rversion {
 493         u32 msize;
 494         struct p9_str version;
 495 };
 496
 497 struct p9_tauth {
 498         u32 afid;
 499         struct p9_str uname;
 500         struct p9_str aname;
 501         u32 n_uname;            /* 9P2000.u extensions */
 502 };
 503
 504 struct p9_rauth {
 505         struct p9_qid qid;
 506 };
 507
 508 struct p9_rerror {
 509         struct p9_str error;
 510         u32 errno;              /* 9p2000.u extension */
 511 };
 512
 513 struct p9_tflush {
 514         u16 oldtag;
 515 };
 516
 517 struct p9_rflush {
 518 };
 519
 520 struct p9_tattach {
 521         u32 fid;
 522         u32 afid;
 523         struct p9_str uname;
 524         struct p9_str aname;
 525         u32 n_uname;            /* 9P2000.u extensions */
 526 };
 527
 528 struct p9_rattach {
 529         struct p9_qid qid;
 530 };
 531
 532 struct p9_twalk {
 533         u32 fid;
 534         u32 newfid;
 535         u16 nwname;
 536         struct p9_str wnames[16];
 537 };
 538
 539 struct p9_rwalk {
 540         u16 nwqid;
 541         struct p9_qid wqids[16];
 542 };
 543
 544 struct p9_topen {
 545         u32 fid;
 546         u8 mode;
 547 };
 548
 549 struct p9_ropen {
 550         struct p9_qid qid;
 551         u32 iounit;
 552 };
 553
 554 struct p9_tcreate {
 555         u32 fid;
 556         struct p9_str name;
 557         u32 perm;
 558         u8 mode;
 559         struct p9_str extension;
 560 };
 561
 562 struct p9_rcreate {
 563         struct p9_qid qid;
 564         u32 iounit;
 565 };
 566
 567 struct p9_tread {
 568         u32 fid;
 569         u64 offset;
 570         u32 count;
 571 };
 572
 573 struct p9_rread {
 574         u32 count;
 575         u8 *data;
 576 };
 577
 578 struct p9_twrite {
 579         u32 fid;
 580         u64 offset;
 581         u32 count;
 582         u8 *data;
 583 };
 584
 585 struct p9_rwrite {
 586         u32 count;
 587 };
 588
 589 struct p9_treaddir {
 590         u32 fid;
 591         u64 offset;
 592         u32 count;
 593 };
 594
 595 struct p9_rreaddir {
 596         u32 count;
 597         u8 *data;
 598 };
 599
 600
 601 struct p9_tclunk {
 602         u32 fid;
 603 };
 604
 605 struct p9_rclunk {
 606 };
 607
 608 struct p9_tremove {
 609         u32 fid;
 610 };
 611
 612 struct p9_rremove {
 613 };
 614
 615 struct p9_tstat {
 616         u32 fid;
 617 };
 618
 619 struct p9_rstat {
 620         struct p9_wstat stat;
 621 };
 622
 623 struct p9_twstat {
 624         u32 fid;
 625         struct p9_wstat stat;
 626 };
 627
 628 struct p9_rwstat {
 629 };
 630
 631 /**
 632  * struct p9_fcall - primary packet structure
 633  * @size: prefixed length of the structure
 634  * @id: protocol operating identifier of type &p9_msg_t
 635  * @tag: transaction id of the request
 636  * @offset: used by marshalling routines to track currentposition in buffer
 637  * @capacity: used by marshalling routines to track total capacity
 638  * @sdata: payload
 639  *
 640  * &p9_fcall represents the structure for all 9P RPC
 641  * transactions.  Requests are packaged into fcalls, and reponses
 642  * must be extracted from them.
 643  *
 644  * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
 645  */
 646
 647 struct p9_fcall {
 648         u32 size;
 649         u8 id;
 650         u16 tag;
 651
 652         size_t offset;
 653         size_t capacity;
 654
 655         uint8_t *sdata;
 656 };
 657
 658 struct p9_idpool;
 659
 660 int p9_errstr2errno(char *errstr, int len);
 661
 662 struct p9_idpool *p9_idpool_create(void);
 663 void p9_idpool_destroy(struct p9_idpool *);
 664 int p9_idpool_get(struct p9_idpool *p);
 665 void p9_idpool_put(int id, struct p9_idpool *p);
 666 int p9_idpool_check(int id, struct p9_idpool *p);
 667
 668 int p9_error_init(void);
 669 int p9_errstr2errno(char *, int);
 670 int p9_trans_fd_init(void);
 671 void p9_trans_fd_exit(void);
 672 #endif /* NET_9P_H */