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_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_wstat {
 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         char *name;
 343         char *uid;
 344         char *gid;
 345         char *muid;
 346         char *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 /* Structures for Protocol Operations */
 353 struct p9_tversion {
 354         u32 msize;
 355         struct p9_str version;
 356 };
 357
 358 struct p9_rversion {
 359         u32 msize;
 360         struct p9_str version;
 361 };
 362
 363 struct p9_tauth {
 364         u32 afid;
 365         struct p9_str uname;
 366         struct p9_str aname;
 367         u32 n_uname;            /* 9P2000.u extensions */
 368 };
 369
 370 struct p9_rauth {
 371         struct p9_qid qid;
 372 };
 373
 374 struct p9_rerror {
 375         struct p9_str error;
 376         u32 errno;              /* 9p2000.u extension */
 377 };
 378
 379 struct p9_tflush {
 380         u16 oldtag;
 381 };
 382
 383 struct p9_rflush {
 384 };
 385
 386 struct p9_tattach {
 387         u32 fid;
 388         u32 afid;
 389         struct p9_str uname;
 390         struct p9_str aname;
 391         u32 n_uname;            /* 9P2000.u extensions */
 392 };
 393
 394 struct p9_rattach {
 395         struct p9_qid qid;
 396 };
 397
 398 struct p9_twalk {
 399         u32 fid;
 400         u32 newfid;
 401         u16 nwname;
 402         struct p9_str wnames[16];
 403 };
 404
 405 struct p9_rwalk {
 406         u16 nwqid;
 407         struct p9_qid wqids[16];
 408 };
 409
 410 struct p9_topen {
 411         u32 fid;
 412         u8 mode;
 413 };
 414
 415 struct p9_ropen {
 416         struct p9_qid qid;
 417         u32 iounit;
 418 };
 419
 420 struct p9_tcreate {
 421         u32 fid;
 422         struct p9_str name;
 423         u32 perm;
 424         u8 mode;
 425         struct p9_str extension;
 426 };
 427
 428 struct p9_rcreate {
 429         struct p9_qid qid;
 430         u32 iounit;
 431 };
 432
 433 struct p9_tread {
 434         u32 fid;
 435         u64 offset;
 436         u32 count;
 437 };
 438
 439 struct p9_rread {
 440         u32 count;
 441         u8 *data;
 442 };
 443
 444 struct p9_twrite {
 445         u32 fid;
 446         u64 offset;
 447         u32 count;
 448         u8 *data;
 449 };
 450
 451 struct p9_rwrite {
 452         u32 count;
 453 };
 454
 455 struct p9_tclunk {
 456         u32 fid;
 457 };
 458
 459 struct p9_rclunk {
 460 };
 461
 462 struct p9_tremove {
 463         u32 fid;
 464 };
 465
 466 struct p9_rremove {
 467 };
 468
 469 struct p9_tstat {
 470         u32 fid;
 471 };
 472
 473 struct p9_rstat {
 474         struct p9_wstat stat;
 475 };
 476
 477 struct p9_twstat {
 478         u32 fid;
 479         struct p9_wstat stat;
 480 };
 481
 482 struct p9_rwstat {
 483 };
 484
 485 /**
 486  * struct p9_fcall - primary packet structure
 487  * @size: prefixed length of the structure
 488  * @id: protocol operating identifier of type &p9_msg_t
 489  * @tag: transaction id of the request
 490  * @offset: used by marshalling routines to track currentposition in buffer
 491  * @capacity: used by marshalling routines to track total capacity
 492  * @sdata: payload
 493  *
 494  * &p9_fcall represents the structure for all 9P RPC
 495  * transactions.  Requests are packaged into fcalls, and reponses
 496  * must be extracted from them.
 497  *
 498  * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
 499  */
 500
 501 struct p9_fcall {
 502         u32 size;
 503         u8 id;
 504         u16 tag;
 505
 506         size_t offset;
 507         size_t capacity;
 508
 509         uint8_t *sdata;
 510 };
 511
 512 struct p9_idpool;
 513
 514 int p9_errstr2errno(char *errstr, int len);
 515
 516 struct p9_idpool *p9_idpool_create(void);
 517 void p9_idpool_destroy(struct p9_idpool *);
 518 int p9_idpool_get(struct p9_idpool *p);
 519 void p9_idpool_put(int id, struct p9_idpool *p);
 520 int p9_idpool_check(int id, struct p9_idpool *p);
 521
 522 int p9_error_init(void);
 523 int p9_errstr2errno(char *, int);
 524 int p9_trans_fd_init(void);
 525 void p9_trans_fd_exit(void);
 526 #endif /* NET_9P_H */