4 * 9P protocol definitions.
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>
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.
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.
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
30 #ifdef CONFIG_NET_9P_DEBUG
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
43 * These flags are passed at mount time to turn on various levels of
44 * verbosity and tracing which will be output to the system logs.
48 P9_DEBUG_ERROR = (1<<0),
50 P9_DEBUG_VFS = (1<<3),
51 P9_DEBUG_CONV = (1<<4),
52 P9_DEBUG_MUX = (1<<5),
53 P9_DEBUG_TRANS = (1<<6),
54 P9_DEBUG_SLABS = (1<<7),
55 P9_DEBUG_FCALL = (1<<8),
58 extern unsigned int p9_debug_level;
60 #define P9_DPRINTK(level, format, arg...) \
62 if ((p9_debug_level & level) == level) \
63 printk(KERN_NOTICE "-- %s (%d): " \
64 format , __FUNCTION__, task_pid_nr(current) , ## arg); \
67 #define PRINT_FCALL_ERROR(s, fcall) P9_DPRINTK(P9_DEBUG_ERROR, \
68 "%s: %.*s\n", s, fcall?fcall->params.rerror.error.len:0, \
69 fcall?fcall->params.rerror.error.str:"");
72 #define P9_DPRINTK(level, format, arg...) do { } while (0)
73 #define PRINT_FCALL_ERROR(s, fcall) do { } while (0)
76 #define P9_EPRINTK(level, format, arg...) \
78 printk(level "9p: %s (%d): " \
79 format , __FUNCTION__, task_pid_nr(current), ## arg); \
83 * enum p9_msg_t - 9P message types
84 * @P9_TVERSION: version handshake request
85 * @P9_RVERSION: version handshake response
86 * @P9_TAUTH: request to establish authentication channel
87 * @P9_RAUTH: response with authentication information
88 * @P9_TATTACH: establish user access to file service
89 * @P9_RATTACH: response with top level handle to file hierarchy
90 * @P9_TERROR: not used
91 * @P9_RERROR: response for any failed request
92 * @P9_TFLUSH: request to abort a previous request
93 * @P9_RFLUSH: response when previous request has been cancelled
94 * @P9_TWALK: descend a directory hierarchy
95 * @P9_RWALK: response with new handle for position within hierarchy
96 * @P9_TOPEN: prepare a handle for I/O on an existing file
97 * @P9_ROPEN: response with file access information
98 * @P9_TCREATE: prepare a handle for I/O on a new file
99 * @P9_RCREATE: response with file access information
100 * @P9_TREAD: request to transfer data from a file or directory
101 * @P9_RREAD: response with data requested
102 * @P9_TWRITE: reuqest to transfer data to a file
103 * @P9_RWRITE: response with out much data was transfered to file
104 * @P9_TCLUNK: forget about a handle to an entity within the file system
105 * @P9_RCLUNK: response when server has forgotten about the handle
106 * @P9_TREMOVE: request to remove an entity from the hierarchy
107 * @P9_RREMOVE: response when server has removed the entity
108 * @P9_TSTAT: request file entity attributes
109 * @P9_RSTAT: response with file entity attributes
110 * @P9_TWSTAT: request to update file entity attributes
111 * @P9_RWSTAT: response when file entity attributes are updated
113 * There are 14 basic operations in 9P2000, paired as
114 * requests and responses. The one special case is ERROR
115 * as there is no @P9_TERROR request for clients to transmit to
116 * the server, but the server may respond to any other request
117 * with an @P9_RERROR.
119 * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html
154 * enum p9_open_mode_t - 9P open modes
155 * @P9_OREAD: open file for reading only
156 * @P9_OWRITE: open file for writing only
157 * @P9_ORDWR: open file for reading or writing
158 * @P9_OEXEC: open file for execution
159 * @P9_OTRUNC: truncate file to zero-length before opening it
160 * @P9_OREXEC: close the file when an exec(2) system call is made
161 * @P9_ORCLOSE: remove the file when the file is closed
162 * @P9_OAPPEND: open the file and seek to the end
163 * @P9_OEXCL: only create a file, do not open it
165 * 9P open modes differ slightly from Posix standard modes.
166 * In particular, there are extra modes which specify different
167 * semantic behaviors than may be available on standard Posix
168 * systems. For example, @P9_OREXEC and @P9_ORCLOSE are modes that
169 * most likely will not be issued from the Linux VFS client, but may
170 * be supported by servers.
172 * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
175 enum p9_open_mode_t {
188 * enum p9_perm_t - 9P permissions
189 * @P9_DMDIR: mode bite for directories
190 * @P9_DMAPPEND: mode bit for is append-only
191 * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed)
192 * @P9_DMMOUNT: mode bite for mount points
193 * @P9_DMAUTH: mode bit for authentication file
194 * @P9_DMTMP: mode bit for non-backed-up files
195 * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u)
196 * @P9_DMLINK: mode bit for hard-link (9P2000.u)
197 * @P9_DMDEVICE: mode bit for device files (9P2000.u)
198 * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u)
199 * @P9_DMSOCKET: mode bit for socket (9P2000.u)
200 * @P9_DMSETUID: mode bit for setuid (9P2000.u)
201 * @P9_DMSETGID: mode bit for setgid (9P2000.u)
202 * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u)
204 * 9P permissions differ slightly from Posix standard modes.
206 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
209 P9_DMDIR = 0x80000000,
210 P9_DMAPPEND = 0x40000000,
211 P9_DMEXCL = 0x20000000,
212 P9_DMMOUNT = 0x10000000,
213 P9_DMAUTH = 0x08000000,
214 P9_DMTMP = 0x04000000,
215 /* 9P2000.u extensions */
216 P9_DMSYMLINK = 0x02000000,
217 P9_DMLINK = 0x01000000,
218 P9_DMDEVICE = 0x00800000,
219 P9_DMNAMEDPIPE = 0x00200000,
220 P9_DMSOCKET = 0x00100000,
221 P9_DMSETUID = 0x00080000,
222 P9_DMSETGID = 0x00040000,
223 P9_DMSETVTX = 0x00010000,
227 * enum p9_qid_t - QID types
228 * @P9_QTDIR: directory
229 * @P9_QTAPPEND: append-only
230 * @P9_QTEXCL: excluse use (only one open handle allowed)
231 * @P9_QTMOUNT: mount points
232 * @P9_QTAUTH: authentication file
233 * @P9_QTTMP: non-backed-up files
234 * @P9_QTSYMLINK: symbolic links (9P2000.u)
235 * @P9_QTLINK: hard-link (9P2000.u)
236 * @P9_QTFILE: normal files
238 * QID types are a subset of permissions - they are primarily
239 * used to differentiate semantics for a file system entity via
240 * a jump-table. Their value is also the most signifigant 16 bits
241 * of the permission_t
243 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
257 /* 9P Magic Numbers */
258 #define P9_NOTAG (u16)(~0)
259 #define P9_NOFID (u32)(~0)
260 #define P9_MAXWELEM 16
262 /* ample room for Twrite/Rread header */
263 #define P9_IOHDRSZ 24
266 * struct p9_str - length prefixed string type
267 * @len: length of the string
270 * The protocol uses length prefixed strings for all
271 * string data, so we replicate that for our internal
281 * struct p9_qid - file system entity information
282 * @type: 8-bit type &p9_qid_t
283 * @version: 16-bit monotonically incrementing version number
284 * @path: 64-bit per-server-unique ID for a file system element
286 * qids are identifiers used by 9P servers to track file system
287 * entities. The type is used to differentiate semantics for operations
288 * on the entity (ie. read means something different on a directory than
289 * on a file). The path provides a server unique index for an entity
290 * (roughly analogous to an inode number), while the version is updated
291 * every time a file is modified and can be used to maintain cache
292 * coherency between clients and serves.
293 * Servers will often differentiate purely synthetic entities by setting
294 * their version to 0, signaling that they should never be cached and
295 * should be accessed synchronously.
297 * See Also://plan9.bell-labs.com/magic/man2html/2/stat
307 * struct p9_stat - file system metadata information
308 * @size: length prefix for this stat structure instance
309 * @type: the type of the server (equivilent to a major number)
310 * @dev: the sub-type of the server (equivilent to a minor number)
311 * @qid: unique id from the server of type &p9_qid
312 * @mode: Plan 9 format permissions of type &p9_perm_t
313 * @atime: Last access/read time
314 * @mtime: Last modify/write time
315 * @length: file length
316 * @name: last element of path (aka filename) in type &p9_str
317 * @uid: owner name in type &p9_str
318 * @gid: group owner in type &p9_str
319 * @muid: last modifier in type &p9_str
320 * @extension: area used to encode extended UNIX support in type &p9_str
321 * @n_uid: numeric user id of owner (part of 9p2000.u extension)
322 * @n_gid: numeric group id (part of 9p2000.u extension)
323 * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension)
325 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
341 struct p9_str extension; /* 9p2000.u extensions */
342 u32 n_uid; /* 9p2000.u extensions */
343 u32 n_gid; /* 9p2000.u extensions */
344 u32 n_muid; /* 9p2000.u extensions */
348 * file metadata (stat) structure used to create Twstat message
349 * The is identical to &p9_stat, but the strings don't point to
350 * the same memory block and should be freed separately
352 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
368 char *extension; /* 9p2000.u extensions */
369 u32 n_uid; /* 9p2000.u extensions */
370 u32 n_gid; /* 9p2000.u extensions */
371 u32 n_muid; /* 9p2000.u extensions */
374 /* Structures for Protocol Operations */
377 struct p9_str version;
382 struct p9_str version;
389 u32 n_uname; /* 9P2000.u extensions */
398 u32 errno; /* 9p2000.u extension */
413 u32 n_uname; /* 9P2000.u extensions */
424 struct p9_str wnames[16];
429 struct p9_qid wqids[16];
447 struct p9_str extension;
508 * struct p9_fcall - primary packet structure
509 * @size: prefixed length of the structure
510 * @id: protocol operating identifier of type &p9_msg_t
511 * @tag: transaction id of the request
513 * @params: per-operation parameters
515 * &p9_fcall represents the structure for all 9P RPC
516 * transactions. Requests are packaged into fcalls, and reponses
517 * must be extracted from them.
519 * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
529 struct p9_tversion tversion;
530 struct p9_rversion rversion;
531 struct p9_tauth tauth;
532 struct p9_rauth rauth;
533 struct p9_rerror rerror;
534 struct p9_tflush tflush;
535 struct p9_rflush rflush;
536 struct p9_tattach tattach;
537 struct p9_rattach rattach;
538 struct p9_twalk twalk;
539 struct p9_rwalk rwalk;
540 struct p9_topen topen;
541 struct p9_ropen ropen;
542 struct p9_tcreate tcreate;
543 struct p9_rcreate rcreate;
544 struct p9_tread tread;
545 struct p9_rread rread;
546 struct p9_twrite twrite;
547 struct p9_rwrite rwrite;
548 struct p9_tclunk tclunk;
549 struct p9_rclunk rclunk;
550 struct p9_tremove tremove;
551 struct p9_rremove rremove;
552 struct p9_tstat tstat;
553 struct p9_rstat rstat;
554 struct p9_twstat twstat;
555 struct p9_rwstat rwstat;
561 int p9_deserialize_stat(void *buf, u32 buflen, struct p9_stat *stat,
563 int p9_deserialize_fcall(void *buf, u32 buflen, struct p9_fcall *fc, int dotu);
564 void p9_set_tag(struct p9_fcall *fc, u16 tag);
565 struct p9_fcall *p9_create_tversion(u32 msize, char *version);
566 struct p9_fcall *p9_create_tattach(u32 fid, u32 afid, char *uname,
567 char *aname, u32 n_uname, int dotu);
568 struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname,
569 u32 n_uname, int dotu);
570 struct p9_fcall *p9_create_tflush(u16 oldtag);
571 struct p9_fcall *p9_create_twalk(u32 fid, u32 newfid, u16 nwname,
573 struct p9_fcall *p9_create_topen(u32 fid, u8 mode);
574 struct p9_fcall *p9_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
575 char *extension, int dotu);
576 struct p9_fcall *p9_create_tread(u32 fid, u64 offset, u32 count);
577 struct p9_fcall *p9_create_twrite(u32 fid, u64 offset, u32 count,
579 struct p9_fcall *p9_create_twrite_u(u32 fid, u64 offset, u32 count,
580 const char __user *data);
581 struct p9_fcall *p9_create_tclunk(u32 fid);
582 struct p9_fcall *p9_create_tremove(u32 fid);
583 struct p9_fcall *p9_create_tstat(u32 fid);
584 struct p9_fcall *p9_create_twstat(u32 fid, struct p9_wstat *wstat,
587 int p9_printfcall(char *buf, int buflen, struct p9_fcall *fc, int dotu);
588 int p9_errstr2errno(char *errstr, int len);
590 struct p9_idpool *p9_idpool_create(void);
591 void p9_idpool_destroy(struct p9_idpool *);
592 int p9_idpool_get(struct p9_idpool *p);
593 void p9_idpool_put(int id, struct p9_idpool *p);
594 int p9_idpool_check(int id, struct p9_idpool *p);
596 int p9_error_init(void);
597 int p9_errstr2errno(char *, int);
598 int p9_trans_fd_init(void);
599 #endif /* NET_9P_H */