1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * 9P protocol definitions. 4 * 5 * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net> 6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 8 */ 9 10 #ifndef NET_9P_H 11 #define NET_9P_H 12 13 /** 14 * enum p9_debug_flags - bits for mount time debug parameter 15 * @P9_DEBUG_ERROR: more verbose error messages including original error string 16 * @P9_DEBUG_9P: 9P protocol tracing 17 * @P9_DEBUG_VFS: VFS API tracing 18 * @P9_DEBUG_CONV: protocol conversion tracing 19 * @P9_DEBUG_MUX: trace management of concurrent transactions 20 * @P9_DEBUG_TRANS: transport tracing 21 * @P9_DEBUG_SLABS: memory management tracing 22 * @P9_DEBUG_FCALL: verbose dump of protocol messages 23 * @P9_DEBUG_FID: fid allocation/deallocation tracking 24 * @P9_DEBUG_PKT: packet marshalling/unmarshalling 25 * @P9_DEBUG_FSC: FS-cache tracing 26 * @P9_DEBUG_VPKT: Verbose packet debugging (full packet dump) 27 * 28 * These flags are passed at mount time to turn on various levels of 29 * verbosity and tracing which will be output to the system logs. 30 */ 31 32 enum p9_debug_flags { 33 P9_DEBUG_ERROR = (1<<0), 34 P9_DEBUG_9P = (1<<2), 35 P9_DEBUG_VFS = (1<<3), 36 P9_DEBUG_CONV = (1<<4), 37 P9_DEBUG_MUX = (1<<5), 38 P9_DEBUG_TRANS = (1<<6), 39 P9_DEBUG_SLABS = (1<<7), 40 P9_DEBUG_FCALL = (1<<8), 41 P9_DEBUG_FID = (1<<9), 42 P9_DEBUG_PKT = (1<<10), 43 P9_DEBUG_FSC = (1<<11), 44 P9_DEBUG_VPKT = (1<<12), 45 }; 46 47 #ifdef CONFIG_NET_9P_DEBUG 48 extern unsigned int p9_debug_level; 49 __printf(3, 4) 50 void _p9_debug(enum p9_debug_flags level, const char *func, 51 const char *fmt, ...); 52 #define p9_debug(level, fmt, ...) \ 53 _p9_debug(level, __func__, fmt, ##__VA_ARGS__) 54 #else 55 #define p9_debug(level, fmt, ...) \ 56 no_printk(fmt, ##__VA_ARGS__) 57 #endif 58 59 /** 60 * enum p9_msg_t - 9P message types 61 * @P9_TLERROR: not used 62 * @P9_RLERROR: response for any failed request for 9P2000.L 63 * @P9_TSTATFS: file system status request 64 * @P9_RSTATFS: file system status response 65 * @P9_TSYMLINK: make symlink request 66 * @P9_RSYMLINK: make symlink response 67 * @P9_TMKNOD: create a special file object request 68 * @P9_RMKNOD: create a special file object response 69 * @P9_TLCREATE: prepare a handle for I/O on an new file for 9P2000.L 70 * @P9_RLCREATE: response with file access information for 9P2000.L 71 * @P9_TRENAME: rename request 72 * @P9_RRENAME: rename response 73 * @P9_TMKDIR: create a directory request 74 * @P9_RMKDIR: create a directory response 75 * @P9_TVERSION: version handshake request 76 * @P9_RVERSION: version handshake response 77 * @P9_TAUTH: request to establish authentication channel 78 * @P9_RAUTH: response with authentication information 79 * @P9_TATTACH: establish user access to file service 80 * @P9_RATTACH: response with top level handle to file hierarchy 81 * @P9_TERROR: not used 82 * @P9_RERROR: response for any failed request 83 * @P9_TFLUSH: request to abort a previous request 84 * @P9_RFLUSH: response when previous request has been cancelled 85 * @P9_TWALK: descend a directory hierarchy 86 * @P9_RWALK: response with new handle for position within hierarchy 87 * @P9_TOPEN: prepare a handle for I/O on an existing file 88 * @P9_ROPEN: response with file access information 89 * @P9_TCREATE: prepare a handle for I/O on a new file 90 * @P9_RCREATE: response with file access information 91 * @P9_TREAD: request to transfer data from a file or directory 92 * @P9_RREAD: response with data requested 93 * @P9_TWRITE: reuqest to transfer data to a file 94 * @P9_RWRITE: response with out much data was transferred to file 95 * @P9_TCLUNK: forget about a handle to an entity within the file system 96 * @P9_RCLUNK: response when server has forgotten about the handle 97 * @P9_TREMOVE: request to remove an entity from the hierarchy 98 * @P9_RREMOVE: response when server has removed the entity 99 * @P9_TSTAT: request file entity attributes 100 * @P9_RSTAT: response with file entity attributes 101 * @P9_TWSTAT: request to update file entity attributes 102 * @P9_RWSTAT: response when file entity attributes are updated 103 * 104 * There are 14 basic operations in 9P2000, paired as 105 * requests and responses. The one special case is ERROR 106 * as there is no @P9_TERROR request for clients to transmit to 107 * the server, but the server may respond to any other request 108 * with an @P9_RERROR. 109 * 110 * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html 111 */ 112 113 enum p9_msg_t { 114 P9_TLERROR = 6, 115 P9_RLERROR, 116 P9_TSTATFS = 8, 117 P9_RSTATFS, 118 P9_TLOPEN = 12, 119 P9_RLOPEN, 120 P9_TLCREATE = 14, 121 P9_RLCREATE, 122 P9_TSYMLINK = 16, 123 P9_RSYMLINK, 124 P9_TMKNOD = 18, 125 P9_RMKNOD, 126 P9_TRENAME = 20, 127 P9_RRENAME, 128 P9_TREADLINK = 22, 129 P9_RREADLINK, 130 P9_TGETATTR = 24, 131 P9_RGETATTR, 132 P9_TSETATTR = 26, 133 P9_RSETATTR, 134 P9_TXATTRWALK = 30, 135 P9_RXATTRWALK, 136 P9_TXATTRCREATE = 32, 137 P9_RXATTRCREATE, 138 P9_TREADDIR = 40, 139 P9_RREADDIR, 140 P9_TFSYNC = 50, 141 P9_RFSYNC, 142 P9_TLOCK = 52, 143 P9_RLOCK, 144 P9_TGETLOCK = 54, 145 P9_RGETLOCK, 146 P9_TLINK = 70, 147 P9_RLINK, 148 P9_TMKDIR = 72, 149 P9_RMKDIR, 150 P9_TRENAMEAT = 74, 151 P9_RRENAMEAT, 152 P9_TUNLINKAT = 76, 153 P9_RUNLINKAT, 154 P9_TVERSION = 100, 155 P9_RVERSION, 156 P9_TAUTH = 102, 157 P9_RAUTH, 158 P9_TATTACH = 104, 159 P9_RATTACH, 160 P9_TERROR = 106, 161 P9_RERROR, 162 P9_TFLUSH = 108, 163 P9_RFLUSH, 164 P9_TWALK = 110, 165 P9_RWALK, 166 P9_TOPEN = 112, 167 P9_ROPEN, 168 P9_TCREATE = 114, 169 P9_RCREATE, 170 P9_TREAD = 116, 171 P9_RREAD, 172 P9_TWRITE = 118, 173 P9_RWRITE, 174 P9_TCLUNK = 120, 175 P9_RCLUNK, 176 P9_TREMOVE = 122, 177 P9_RREMOVE, 178 P9_TSTAT = 124, 179 P9_RSTAT, 180 P9_TWSTAT = 126, 181 P9_RWSTAT, 182 }; 183 184 /** 185 * enum p9_open_mode_t - 9P open modes 186 * @P9_OREAD: open file for reading only 187 * @P9_OWRITE: open file for writing only 188 * @P9_ORDWR: open file for reading or writing 189 * @P9_OEXEC: open file for execution 190 * @P9_OTRUNC: truncate file to zero-length before opening it 191 * @P9_OREXEC: close the file when an exec(2) system call is made 192 * @P9_ORCLOSE: remove the file when the file is closed 193 * @P9_OAPPEND: open the file and seek to the end 194 * @P9_OEXCL: only create a file, do not open it 195 * 196 * 9P open modes differ slightly from Posix standard modes. 197 * In particular, there are extra modes which specify different 198 * semantic behaviors than may be available on standard Posix 199 * systems. For example, @P9_OREXEC and @P9_ORCLOSE are modes that 200 * most likely will not be issued from the Linux VFS client, but may 201 * be supported by servers. 202 * 203 * See Also: http://plan9.bell-labs.com/magic/man2html/2/open 204 */ 205 206 enum p9_open_mode_t { 207 P9_OREAD = 0x00, 208 P9_OWRITE = 0x01, 209 P9_ORDWR = 0x02, 210 P9_OEXEC = 0x03, 211 P9_OTRUNC = 0x10, 212 P9_OREXEC = 0x20, 213 P9_ORCLOSE = 0x40, 214 P9_OAPPEND = 0x80, 215 P9_OEXCL = 0x1000, 216 }; 217 218 /** 219 * enum p9_perm_t - 9P permissions 220 * @P9_DMDIR: mode bit for directories 221 * @P9_DMAPPEND: mode bit for is append-only 222 * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed) 223 * @P9_DMMOUNT: mode bit for mount points 224 * @P9_DMAUTH: mode bit for authentication file 225 * @P9_DMTMP: mode bit for non-backed-up files 226 * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u) 227 * @P9_DMLINK: mode bit for hard-link (9P2000.u) 228 * @P9_DMDEVICE: mode bit for device files (9P2000.u) 229 * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u) 230 * @P9_DMSOCKET: mode bit for socket (9P2000.u) 231 * @P9_DMSETUID: mode bit for setuid (9P2000.u) 232 * @P9_DMSETGID: mode bit for setgid (9P2000.u) 233 * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u) 234 * 235 * 9P permissions differ slightly from Posix standard modes. 236 * 237 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat 238 */ 239 enum p9_perm_t { 240 P9_DMDIR = 0x80000000, 241 P9_DMAPPEND = 0x40000000, 242 P9_DMEXCL = 0x20000000, 243 P9_DMMOUNT = 0x10000000, 244 P9_DMAUTH = 0x08000000, 245 P9_DMTMP = 0x04000000, 246 /* 9P2000.u extensions */ 247 P9_DMSYMLINK = 0x02000000, 248 P9_DMLINK = 0x01000000, 249 P9_DMDEVICE = 0x00800000, 250 P9_DMNAMEDPIPE = 0x00200000, 251 P9_DMSOCKET = 0x00100000, 252 P9_DMSETUID = 0x00080000, 253 P9_DMSETGID = 0x00040000, 254 P9_DMSETVTX = 0x00010000, 255 }; 256 257 /* 9p2000.L open flags */ 258 #define P9_DOTL_RDONLY 00000000 259 #define P9_DOTL_WRONLY 00000001 260 #define P9_DOTL_RDWR 00000002 261 #define P9_DOTL_NOACCESS 00000003 262 #define P9_DOTL_CREATE 00000100 263 #define P9_DOTL_EXCL 00000200 264 #define P9_DOTL_NOCTTY 00000400 265 #define P9_DOTL_TRUNC 00001000 266 #define P9_DOTL_APPEND 00002000 267 #define P9_DOTL_NONBLOCK 00004000 268 #define P9_DOTL_DSYNC 00010000 269 #define P9_DOTL_FASYNC 00020000 270 #define P9_DOTL_DIRECT 00040000 271 #define P9_DOTL_LARGEFILE 00100000 272 #define P9_DOTL_DIRECTORY 00200000 273 #define P9_DOTL_NOFOLLOW 00400000 274 #define P9_DOTL_NOATIME 01000000 275 #define P9_DOTL_CLOEXEC 02000000 276 #define P9_DOTL_SYNC 04000000 277 278 /* 9p2000.L at flags */ 279 #define P9_DOTL_AT_REMOVEDIR 0x200 280 281 /* 9p2000.L lock type */ 282 #define P9_LOCK_TYPE_RDLCK 0 283 #define P9_LOCK_TYPE_WRLCK 1 284 #define P9_LOCK_TYPE_UNLCK 2 285 286 /** 287 * enum p9_qid_t - QID types 288 * @P9_QTDIR: directory 289 * @P9_QTAPPEND: append-only 290 * @P9_QTEXCL: excluse use (only one open handle allowed) 291 * @P9_QTMOUNT: mount points 292 * @P9_QTAUTH: authentication file 293 * @P9_QTTMP: non-backed-up files 294 * @P9_QTSYMLINK: symbolic links (9P2000.u) 295 * @P9_QTLINK: hard-link (9P2000.u) 296 * @P9_QTFILE: normal files 297 * 298 * QID types are a subset of permissions - they are primarily 299 * used to differentiate semantics for a file system entity via 300 * a jump-table. Their value is also the most significant 16 bits 301 * of the permission_t 302 * 303 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat 304 */ 305 enum p9_qid_t { 306 P9_QTDIR = 0x80, 307 P9_QTAPPEND = 0x40, 308 P9_QTEXCL = 0x20, 309 P9_QTMOUNT = 0x10, 310 P9_QTAUTH = 0x08, 311 P9_QTTMP = 0x04, 312 P9_QTSYMLINK = 0x02, 313 P9_QTLINK = 0x01, 314 P9_QTFILE = 0x00, 315 }; 316 317 /* 9P Magic Numbers */ 318 #define P9_NOTAG ((u16)(~0)) 319 #define P9_NOFID ((u32)(~0)) 320 #define P9_MAXWELEM 16 321 322 /* Minimal header size: size[4] type[1] tag[2] */ 323 #define P9_HDRSZ 7 324 325 /* ample room for Twrite/Rread header */ 326 #define P9_IOHDRSZ 24 327 328 /* Room for readdir header */ 329 #define P9_READDIRHDRSZ 24 330 331 /* size of header for zero copy read/write */ 332 #define P9_ZC_HDR_SZ 4096 333 334 /* maximum length of an error string */ 335 #define P9_ERRMAX 128 336 337 /** 338 * struct p9_qid - file system entity information 339 * @type: 8-bit type &p9_qid_t 340 * @version: 16-bit monotonically incrementing version number 341 * @path: 64-bit per-server-unique ID for a file system element 342 * 343 * qids are identifiers used by 9P servers to track file system 344 * entities. The type is used to differentiate semantics for operations 345 * on the entity (ie. read means something different on a directory than 346 * on a file). The path provides a server unique index for an entity 347 * (roughly analogous to an inode number), while the version is updated 348 * every time a file is modified and can be used to maintain cache 349 * coherency between clients and serves. 350 * Servers will often differentiate purely synthetic entities by setting 351 * their version to 0, signaling that they should never be cached and 352 * should be accessed synchronously. 353 * 354 * See Also://plan9.bell-labs.com/magic/man2html/2/stat 355 */ 356 357 struct p9_qid { 358 u8 type; 359 u32 version; 360 u64 path; 361 }; 362 363 /** 364 * struct p9_wstat - file system metadata information 365 * @size: length prefix for this stat structure instance 366 * @type: the type of the server (equivalent to a major number) 367 * @dev: the sub-type of the server (equivalent to a minor number) 368 * @qid: unique id from the server of type &p9_qid 369 * @mode: Plan 9 format permissions of type &p9_perm_t 370 * @atime: Last access/read time 371 * @mtime: Last modify/write time 372 * @length: file length 373 * @name: last element of path (aka filename) 374 * @uid: owner name 375 * @gid: group owner 376 * @muid: last modifier 377 * @extension: area used to encode extended UNIX support 378 * @n_uid: numeric user id of owner (part of 9p2000.u extension) 379 * @n_gid: numeric group id (part of 9p2000.u extension) 380 * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension) 381 * 382 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat 383 */ 384 385 struct p9_wstat { 386 u16 size; 387 u16 type; 388 u32 dev; 389 struct p9_qid qid; 390 u32 mode; 391 u32 atime; 392 u32 mtime; 393 u64 length; 394 const char *name; 395 const char *uid; 396 const char *gid; 397 const char *muid; 398 char *extension; /* 9p2000.u extensions */ 399 kuid_t n_uid; /* 9p2000.u extensions */ 400 kgid_t n_gid; /* 9p2000.u extensions */ 401 kuid_t n_muid; /* 9p2000.u extensions */ 402 }; 403 404 struct p9_stat_dotl { 405 u64 st_result_mask; 406 struct p9_qid qid; 407 u32 st_mode; 408 kuid_t st_uid; 409 kgid_t st_gid; 410 u64 st_nlink; 411 u64 st_rdev; 412 u64 st_size; 413 u64 st_blksize; 414 u64 st_blocks; 415 u64 st_atime_sec; 416 u64 st_atime_nsec; 417 u64 st_mtime_sec; 418 u64 st_mtime_nsec; 419 u64 st_ctime_sec; 420 u64 st_ctime_nsec; 421 u64 st_btime_sec; 422 u64 st_btime_nsec; 423 u64 st_gen; 424 u64 st_data_version; 425 }; 426 427 #define P9_STATS_MODE 0x00000001ULL 428 #define P9_STATS_NLINK 0x00000002ULL 429 #define P9_STATS_UID 0x00000004ULL 430 #define P9_STATS_GID 0x00000008ULL 431 #define P9_STATS_RDEV 0x00000010ULL 432 #define P9_STATS_ATIME 0x00000020ULL 433 #define P9_STATS_MTIME 0x00000040ULL 434 #define P9_STATS_CTIME 0x00000080ULL 435 #define P9_STATS_INO 0x00000100ULL 436 #define P9_STATS_SIZE 0x00000200ULL 437 #define P9_STATS_BLOCKS 0x00000400ULL 438 439 #define P9_STATS_BTIME 0x00000800ULL 440 #define P9_STATS_GEN 0x00001000ULL 441 #define P9_STATS_DATA_VERSION 0x00002000ULL 442 443 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 444 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 445 446 /** 447 * struct p9_iattr_dotl - P9 inode attribute for setattr 448 * @valid: bitfield specifying which fields are valid 449 * same as in struct iattr 450 * @mode: File permission bits 451 * @uid: user id of owner 452 * @gid: group id 453 * @size: File size 454 * @atime_sec: Last access time, seconds 455 * @atime_nsec: Last access time, nanoseconds 456 * @mtime_sec: Last modification time, seconds 457 * @mtime_nsec: Last modification time, nanoseconds 458 */ 459 460 struct p9_iattr_dotl { 461 u32 valid; 462 u32 mode; 463 kuid_t uid; 464 kgid_t gid; 465 u64 size; 466 u64 atime_sec; 467 u64 atime_nsec; 468 u64 mtime_sec; 469 u64 mtime_nsec; 470 }; 471 472 #define P9_LOCK_SUCCESS 0 473 #define P9_LOCK_BLOCKED 1 474 #define P9_LOCK_ERROR 2 475 #define P9_LOCK_GRACE 3 476 477 #define P9_LOCK_FLAGS_BLOCK 1 478 #define P9_LOCK_FLAGS_RECLAIM 2 479 480 /* struct p9_flock: POSIX lock structure 481 * @type - type of lock 482 * @flags - lock flags 483 * @start - starting offset of the lock 484 * @length - number of bytes 485 * @proc_id - process id which wants to take lock 486 * @client_id - client id 487 */ 488 489 struct p9_flock { 490 u8 type; 491 u32 flags; 492 u64 start; 493 u64 length; 494 u32 proc_id; 495 char *client_id; 496 }; 497 498 /* struct p9_getlock: getlock structure 499 * @type - type of lock 500 * @start - starting offset of the lock 501 * @length - number of bytes 502 * @proc_id - process id which wants to take lock 503 * @client_id - client id 504 */ 505 506 struct p9_getlock { 507 u8 type; 508 u64 start; 509 u64 length; 510 u32 proc_id; 511 char *client_id; 512 }; 513 514 struct p9_rstatfs { 515 u32 type; 516 u32 bsize; 517 u64 blocks; 518 u64 bfree; 519 u64 bavail; 520 u64 files; 521 u64 ffree; 522 u64 fsid; 523 u32 namelen; 524 }; 525 526 /** 527 * struct p9_fcall - primary packet structure 528 * @size: prefixed length of the structure 529 * @id: protocol operating identifier of type &p9_msg_t 530 * @tag: transaction id of the request 531 * @offset: used by marshalling routines to track current position in buffer 532 * @capacity: used by marshalling routines to track total malloc'd capacity 533 * @sdata: payload 534 * @zc: whether zero-copy is used 535 * 536 * &p9_fcall represents the structure for all 9P RPC 537 * transactions. Requests are packaged into fcalls, and reponses 538 * must be extracted from them. 539 * 540 * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall 541 */ 542 543 struct p9_fcall { 544 u32 size; 545 u8 id; 546 u16 tag; 547 548 size_t offset; 549 size_t capacity; 550 551 struct kmem_cache *cache; 552 u8 *sdata; 553 bool zc; 554 }; 555 556 int p9_errstr2errno(char *errstr, int len); 557 558 int p9_error_init(void); 559 #endif /* NET_9P_H */ 560