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 #ifdef CONFIG_NET_9P_DEBUG
  31
  32 /**
  33  * enum p9_debug_flags - bits for mount time debug parameter
  34  * @P9_DEBUG_ERROR: more verbose error messages including original error string
  35  * @P9_DEBUG_9P: 9P protocol tracing
  36  * @P9_DEBUG_VFS: VFS API tracing
  37  * @P9_DEBUG_CONV: protocol conversion tracing
  38  * @P9_DEBUG_MUX: trace management of concurrent transactions
  39  * @P9_DEBUG_TRANS: transport tracing
  40  * @P9_DEBUG_SLABS: memory management tracing
  41  * @P9_DEBUG_FCALL: verbose dump of protocol messages
  42  * @P9_DEBUG_FID: fid allocation/deallocation tracking
  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 };
  59
  60 extern unsigned int p9_debug_level;
  61
  62 #define P9_DPRINTK(level, format, arg...) \
  63 do {  \
  64         if (level == P9_DEBUG_9P) \
  65                 printk(KERN_NOTICE "(%8.8d) " \
  66                 format , task_pid_nr(current) , ## arg); \
  67         else if ((p9_debug_level & level) == level) \
  68                 printk(KERN_NOTICE "-- %s (%d): " \
  69                 format , __func__, task_pid_nr(current) , ## arg); \
  70 } while (0)
  71
  72 #define PRINT_FCALL_ERROR(s, fcall) P9_DPRINTK(P9_DEBUG_ERROR,   \
  73         "%s: %.*s\n", s, fcall?fcall->params.rerror.error.len:0, \
  74         fcall?fcall->params.rerror.error.str:"");
  75
  76 #else
  77 #define P9_DPRINTK(level, format, arg...)  do { } while (0)
  78 #define PRINT_FCALL_ERROR(s, fcall) 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_TVERSION: version handshake request
  90  * @P9_RVERSION: version handshake response
  91  * @P9_TAUTH: request to establish authentication channel
  92  * @P9_RAUTH: response with authentication information
  93  * @P9_TATTACH: establish user access to file service
  94  * @P9_RATTACH: response with top level handle to file hierarchy
  95  * @P9_TERROR: not used
  96  * @P9_RERROR: response for any failed request
  97  * @P9_TFLUSH: request to abort a previous request
  98  * @P9_RFLUSH: response when previous request has been cancelled
  99  * @P9_TWALK: descend a directory hierarchy
 100  * @P9_RWALK: response with new handle for position within hierarchy
 101  * @P9_TOPEN: prepare a handle for I/O on an existing file
 102  * @P9_ROPEN: response with file access information
 103  * @P9_TCREATE: prepare a handle for I/O on a new file
 104  * @P9_RCREATE: response with file access information
 105  * @P9_TREAD: request to transfer data from a file or directory
 106  * @P9_RREAD: response with data requested
 107  * @P9_TWRITE: reuqest to transfer data to a file
 108  * @P9_RWRITE: response with out much data was transfered to file
 109  * @P9_TCLUNK: forget about a handle to an entity within the file system
 110  * @P9_RCLUNK: response when server has forgotten about the handle
 111  * @P9_TREMOVE: request to remove an entity from the hierarchy
 112  * @P9_RREMOVE: response when server has removed the entity
 113  * @P9_TSTAT: request file entity attributes
 114  * @P9_RSTAT: response with file entity attributes
 115  * @P9_TWSTAT: request to update file entity attributes
 116  * @P9_RWSTAT: response when file entity attributes are updated
 117  *
 118  * There are 14 basic operations in 9P2000, paired as
 119  * requests and responses.  The one special case is ERROR
 120  * as there is no @P9_TERROR request for clients to transmit to
 121  * the server, but the server may respond to any other request
 122  * with an @P9_RERROR.
 123  *
 124  * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html
 125  */
 126
 127 enum p9_msg_t {
 128         P9_TVERSION = 100,
 129         P9_RVERSION,
 130         P9_TAUTH = 102,
 131         P9_RAUTH,
 132         P9_TATTACH = 104,
 133         P9_RATTACH,
 134         P9_TERROR = 106,
 135         P9_RERROR,
 136         P9_TFLUSH = 108,
 137         P9_RFLUSH,
 138         P9_TWALK = 110,
 139         P9_RWALK,
 140         P9_TOPEN = 112,
 141         P9_ROPEN,
 142         P9_TCREATE = 114,
 143         P9_RCREATE,
 144         P9_TREAD = 116,
 145         P9_RREAD,
 146         P9_TWRITE = 118,
 147         P9_RWRITE,
 148         P9_TCLUNK = 120,
 149         P9_RCLUNK,
 150         P9_TREMOVE = 122,
 151         P9_RREMOVE,
 152         P9_TSTAT = 124,
 153         P9_RSTAT,
 154         P9_TWSTAT = 126,
 155         P9_RWSTAT,
 156 };
 157
 158 /**
 159  * enum p9_open_mode_t - 9P open modes
 160  * @P9_OREAD: open file for reading only
 161  * @P9_OWRITE: open file for writing only
 162  * @P9_ORDWR: open file for reading or writing
 163  * @P9_OEXEC: open file for execution
 164  * @P9_OTRUNC: truncate file to zero-length before opening it
 165  * @P9_OREXEC: close the file when an exec(2) system call is made
 166  * @P9_ORCLOSE: remove the file when the file is closed
 167  * @P9_OAPPEND: open the file and seek to the end
 168  * @P9_OEXCL: only create a file, do not open it
 169  *
 170  * 9P open modes differ slightly from Posix standard modes.
 171  * In particular, there are extra modes which specify different
 172  * semantic behaviors than may be available on standard Posix
 173  * systems.  For example, @P9_OREXEC and @P9_ORCLOSE are modes that
 174  * most likely will not be issued from the Linux VFS client, but may
 175  * be supported by servers.
 176  *
 177  * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
 178  */
 179
 180 enum p9_open_mode_t {
 181         P9_OREAD = 0x00,
 182         P9_OWRITE = 0x01,
 183         P9_ORDWR = 0x02,
 184         P9_OEXEC = 0x03,
 185         P9_OTRUNC = 0x10,
 186         P9_OREXEC = 0x20,
 187         P9_ORCLOSE = 0x40,
 188         P9_OAPPEND = 0x80,
 189         P9_OEXCL = 0x1000,
 190 };
 191
 192 /**
 193  * enum p9_perm_t - 9P permissions
 194  * @P9_DMDIR: mode bite for directories
 195  * @P9_DMAPPEND: mode bit for is append-only
 196  * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed)
 197  * @P9_DMMOUNT: mode bite for mount points
 198  * @P9_DMAUTH: mode bit for authentication file
 199  * @P9_DMTMP: mode bit for non-backed-up files
 200  * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u)
 201  * @P9_DMLINK: mode bit for hard-link (9P2000.u)
 202  * @P9_DMDEVICE: mode bit for device files (9P2000.u)
 203  * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u)
 204  * @P9_DMSOCKET: mode bit for socket (9P2000.u)
 205  * @P9_DMSETUID: mode bit for setuid (9P2000.u)
 206  * @P9_DMSETGID: mode bit for setgid (9P2000.u)
 207  * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u)
 208  *
 209  * 9P permissions differ slightly from Posix standard modes.
 210  *
 211  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 212  */
 213 enum p9_perm_t {
 214         P9_DMDIR = 0x80000000,
 215         P9_DMAPPEND = 0x40000000,
 216         P9_DMEXCL = 0x20000000,
 217         P9_DMMOUNT = 0x10000000,
 218         P9_DMAUTH = 0x08000000,
 219         P9_DMTMP = 0x04000000,
 220 /* 9P2000.u extensions */
 221         P9_DMSYMLINK = 0x02000000,
 222         P9_DMLINK = 0x01000000,
 223         P9_DMDEVICE = 0x00800000,
 224         P9_DMNAMEDPIPE = 0x00200000,
 225         P9_DMSOCKET = 0x00100000,
 226         P9_DMSETUID = 0x00080000,
 227         P9_DMSETGID = 0x00040000,
 228         P9_DMSETVTX = 0x00010000,
 229 };
 230
 231 /**
 232  * enum p9_qid_t - QID types
 233  * @P9_QTDIR: directory
 234  * @P9_QTAPPEND: append-only
 235  * @P9_QTEXCL: excluse use (only one open handle allowed)
 236  * @P9_QTMOUNT: mount points
 237  * @P9_QTAUTH: authentication file
 238  * @P9_QTTMP: non-backed-up files
 239  * @P9_QTSYMLINK: symbolic links (9P2000.u)
 240  * @P9_QTLINK: hard-link (9P2000.u)
 241  * @P9_QTFILE: normal files
 242  *
 243  * QID types are a subset of permissions - they are primarily
 244  * used to differentiate semantics for a file system entity via
 245  * a jump-table.  Their value is also the most signifigant 16 bits
 246  * of the permission_t
 247  *
 248  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 249  */
 250 enum p9_qid_t {
 251         P9_QTDIR = 0x80,
 252         P9_QTAPPEND = 0x40,
 253         P9_QTEXCL = 0x20,
 254         P9_QTMOUNT = 0x10,
 255         P9_QTAUTH = 0x08,
 256         P9_QTTMP = 0x04,
 257         P9_QTSYMLINK = 0x02,
 258         P9_QTLINK = 0x01,
 259         P9_QTFILE = 0x00,
 260 };
 261
 262 /* 9P Magic Numbers */
 263 #define P9_NOTAG        (u16)(~0)
 264 #define P9_NOFID        (u32)(~0)
 265 #define P9_MAXWELEM     16
 266
 267 /* ample room for Twrite/Rread header */
 268 #define P9_IOHDRSZ      24
 269
 270 /**
 271  * struct p9_str - length prefixed string type
 272  * @len: length of the string
 273  * @str: the string
 274  *
 275  * The protocol uses length prefixed strings for all
 276  * string data, so we replicate that for our internal
 277  * string members.
 278  */
 279
 280 struct p9_str {
 281         u16 len;
 282         char *str;
 283 };
 284
 285 /**
 286  * struct p9_qid - file system entity information
 287  * @type: 8-bit type &p9_qid_t
 288  * @version: 16-bit monotonically incrementing version number
 289  * @path: 64-bit per-server-unique ID for a file system element
 290  *
 291  * qids are identifiers used by 9P servers to track file system
 292  * entities.  The type is used to differentiate semantics for operations
 293  * on the entity (ie. read means something different on a directory than
 294  * on a file).  The path provides a server unique index for an entity
 295  * (roughly analogous to an inode number), while the version is updated
 296  * every time a file is modified and can be used to maintain cache
 297  * coherency between clients and serves.
 298  * Servers will often differentiate purely synthetic entities by setting
 299  * their version to 0, signaling that they should never be cached and
 300  * should be accessed synchronously.
 301  *
 302  * See Also://plan9.bell-labs.com/magic/man2html/2/stat
 303  */
 304
 305 struct p9_qid {
 306         u8 type;
 307         u32 version;
 308         u64 path;
 309 };
 310
 311 /**
 312  * struct p9_stat - file system metadata information
 313  * @size: length prefix for this stat structure instance
 314  * @type: the type of the server (equivilent to a major number)
 315  * @dev: the sub-type of the server (equivilent to a minor number)
 316  * @qid: unique id from the server of type &p9_qid
 317  * @mode: Plan 9 format permissions of type &p9_perm_t
 318  * @atime: Last access/read time
 319  * @mtime: Last modify/write time
 320  * @length: file length
 321  * @name: last element of path (aka filename) in type &p9_str
 322  * @uid: owner name in type &p9_str
 323  * @gid: group owner in type &p9_str
 324  * @muid: last modifier in type &p9_str
 325  * @extension: area used to encode extended UNIX support in type &p9_str
 326  * @n_uid: numeric user id of owner (part of 9p2000.u extension)
 327  * @n_gid: numeric group id (part of 9p2000.u extension)
 328  * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension)
 329  *
 330  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 331  */
 332
 333 struct p9_stat {
 334         u16 size;
 335         u16 type;
 336         u32 dev;
 337         struct p9_qid qid;
 338         u32 mode;
 339         u32 atime;
 340         u32 mtime;
 341         u64 length;
 342         struct p9_str name;
 343         struct p9_str uid;
 344         struct p9_str gid;
 345         struct p9_str muid;
 346         struct p9_str extension;        /* 9p2000.u extensions */
 347         u32 n_uid;                      /* 9p2000.u extensions */
 348         u32 n_gid;                      /* 9p2000.u extensions */
 349         u32 n_muid;                     /* 9p2000.u extensions */
 350 };
 351
 352 /*
 353  * file metadata (stat) structure used to create Twstat message
 354  * The is identical to &p9_stat, but the strings don't point to
 355  * the same memory block and should be freed separately
 356  *
 357  * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
 358  */
 359
 360 struct p9_wstat {
 361         u16 size;
 362         u16 type;
 363         u32 dev;
 364         struct p9_qid qid;
 365         u32 mode;
 366         u32 atime;
 367         u32 mtime;
 368         u64 length;
 369         char *name;
 370         char *uid;
 371         char *gid;
 372         char *muid;
 373         char *extension;        /* 9p2000.u extensions */
 374         u32 n_uid;              /* 9p2000.u extensions */
 375         u32 n_gid;              /* 9p2000.u extensions */
 376         u32 n_muid;             /* 9p2000.u extensions */
 377 };
 378
 379 /* Structures for Protocol Operations */
 380 struct p9_tversion {
 381         u32 msize;
 382         struct p9_str version;
 383 };
 384
 385 struct p9_rversion {
 386         u32 msize;
 387         struct p9_str version;
 388 };
 389
 390 struct p9_tauth {
 391         u32 afid;
 392         struct p9_str uname;
 393         struct p9_str aname;
 394         u32 n_uname;            /* 9P2000.u extensions */
 395 };
 396
 397 struct p9_rauth {
 398         struct p9_qid qid;
 399 };
 400
 401 struct p9_rerror {
 402         struct p9_str error;
 403         u32 errno;              /* 9p2000.u extension */
 404 };
 405
 406 struct p9_tflush {
 407         u16 oldtag;
 408 };
 409
 410 struct p9_rflush {
 411 };
 412
 413 struct p9_tattach {
 414         u32 fid;
 415         u32 afid;
 416         struct p9_str uname;
 417         struct p9_str aname;
 418         u32 n_uname;            /* 9P2000.u extensions */
 419 };
 420
 421 struct p9_rattach {
 422         struct p9_qid qid;
 423 };
 424
 425 struct p9_twalk {
 426         u32 fid;
 427         u32 newfid;
 428         u16 nwname;
 429         struct p9_str wnames[16];
 430 };
 431
 432 struct p9_rwalk {
 433         u16 nwqid;
 434         struct p9_qid wqids[16];
 435 };
 436
 437 struct p9_topen {
 438         u32 fid;
 439         u8 mode;
 440 };
 441
 442 struct p9_ropen {
 443         struct p9_qid qid;
 444         u32 iounit;
 445 };
 446
 447 struct p9_tcreate {
 448         u32 fid;
 449         struct p9_str name;
 450         u32 perm;
 451         u8 mode;
 452         struct p9_str extension;
 453 };
 454
 455 struct p9_rcreate {
 456         struct p9_qid qid;
 457         u32 iounit;
 458 };
 459
 460 struct p9_tread {
 461         u32 fid;
 462         u64 offset;
 463         u32 count;
 464 };
 465
 466 struct p9_rread {
 467         u32 count;
 468         u8 *data;
 469 };
 470
 471 struct p9_twrite {
 472         u32 fid;
 473         u64 offset;
 474         u32 count;
 475         u8 *data;
 476 };
 477
 478 struct p9_rwrite {
 479         u32 count;
 480 };
 481
 482 struct p9_tclunk {
 483         u32 fid;
 484 };
 485
 486 struct p9_rclunk {
 487 };
 488
 489 struct p9_tremove {
 490         u32 fid;
 491 };
 492
 493 struct p9_rremove {
 494 };
 495
 496 struct p9_tstat {
 497         u32 fid;
 498 };
 499
 500 struct p9_rstat {
 501         struct p9_stat stat;
 502 };
 503
 504 struct p9_twstat {
 505         u32 fid;
 506         struct p9_stat stat;
 507 };
 508
 509 struct p9_rwstat {
 510 };
 511
 512 /**
 513  * struct p9_fcall - primary packet structure
 514  * @size: prefixed length of the structure
 515  * @id: protocol operating identifier of type &p9_msg_t
 516  * @tag: transaction id of the request
 517  * @offset: used by marshalling routines to track currentposition in buffer
 518  * @capacity: used by marshalling routines to track total capacity
 519  * @sdata: payload
 520  * @params: per-operation parameters
 521  *
 522  * &p9_fcall represents the structure for all 9P RPC
 523  * transactions.  Requests are packaged into fcalls, and reponses
 524  * must be extracted from them.
 525  *
 526  * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
 527  */
 528
 529 struct p9_fcall {
 530         u32 size;
 531         u8 id;
 532         u16 tag;
 533
 534         size_t offset;
 535         size_t capacity;
 536
 537         uint8_t *sdata;
 538
 539         union {
 540                 struct p9_tversion tversion;
 541                 struct p9_rversion rversion;
 542                 struct p9_tauth tauth;
 543                 struct p9_rauth rauth;
 544                 struct p9_rerror rerror;
 545                 struct p9_tflush tflush;
 546                 struct p9_rflush rflush;
 547                 struct p9_tattach tattach;
 548                 struct p9_rattach rattach;
 549                 struct p9_twalk twalk;
 550                 struct p9_rwalk rwalk;
 551                 struct p9_topen topen;
 552                 struct p9_ropen ropen;
 553                 struct p9_tcreate tcreate;
 554                 struct p9_rcreate rcreate;
 555                 struct p9_tread tread;
 556                 struct p9_rread rread;
 557                 struct p9_twrite twrite;
 558                 struct p9_rwrite rwrite;
 559                 struct p9_tclunk tclunk;
 560                 struct p9_rclunk rclunk;
 561                 struct p9_tremove tremove;
 562                 struct p9_rremove rremove;
 563                 struct p9_tstat tstat;
 564                 struct p9_rstat rstat;
 565                 struct p9_twstat twstat;
 566                 struct p9_rwstat rwstat;
 567         } params;
 568 };
 569
 570 struct p9_idpool;
 571
 572 int p9_deserialize_stat(void *buf, u32 buflen, struct p9_stat *stat,
 573         int dotu);
 574 int p9_deserialize_fcall(void *buf, u32 buflen, struct p9_fcall *fc, int dotu);
 575 void p9_set_tag(struct p9_fcall *fc, u16 tag);
 576 struct p9_fcall *p9_create_tversion(u32 msize, char *version);
 577 struct p9_fcall *p9_create_tattach(u32 fid, u32 afid, char *uname,
 578         char *aname, u32 n_uname, int dotu);
 579 struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname,
 580         u32 n_uname, int dotu);
 581 struct p9_fcall *p9_create_tflush(u16 oldtag);
 582 struct p9_fcall *p9_create_twalk(u32 fid, u32 newfid, u16 nwname,
 583         char **wnames);
 584 struct p9_fcall *p9_create_topen(u32 fid, u8 mode);
 585 struct p9_fcall *p9_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
 586         char *extension, int dotu);
 587 struct p9_fcall *p9_create_tread(u32 fid, u64 offset, u32 count);
 588 struct p9_fcall *p9_create_twrite(u32 fid, u64 offset, u32 count,
 589         const char *data);
 590 struct p9_fcall *p9_create_twrite_u(u32 fid, u64 offset, u32 count,
 591         const char __user *data);
 592 struct p9_fcall *p9_create_tclunk(u32 fid);
 593 struct p9_fcall *p9_create_tremove(u32 fid);
 594 struct p9_fcall *p9_create_tstat(u32 fid);
 595 struct p9_fcall *p9_create_twstat(u32 fid, struct p9_wstat *wstat,
 596         int dotu);
 597
 598 int p9_errstr2errno(char *errstr, int len);
 599
 600 struct p9_idpool *p9_idpool_create(void);
 601 void p9_idpool_destroy(struct p9_idpool *);
 602 int p9_idpool_get(struct p9_idpool *p);
 603 void p9_idpool_put(int id, struct p9_idpool *p);
 604 int p9_idpool_check(int id, struct p9_idpool *p);
 605
 606 int p9_error_init(void);
 607 int p9_errstr2errno(char *, int);
 608 int p9_trans_fd_init(void);
 609 void p9_trans_fd_exit(void);
 610 #endif /* NET_9P_H */