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
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
42 * These flags are passed at mount time to turn on various levels of
43 * verbosity and tracing which will be output to the system logs.
47 P9_DEBUG_ERROR = (1<<0),
49 P9_DEBUG_VFS = (1<<3),
50 P9_DEBUG_CONV = (1<<4),
51 P9_DEBUG_MUX = (1<<5),
52 P9_DEBUG_TRANS = (1<<6),
53 P9_DEBUG_SLABS = (1<<7),
54 P9_DEBUG_FCALL = (1<<8),
55 P9_DEBUG_FID = (1<<9),
56 P9_DEBUG_PKT = (1<<10),
59 #ifdef CONFIG_NET_9P_DEBUG
60 extern unsigned int p9_debug_level;
62 #define P9_DPRINTK(level, format, arg...) \
64 if ((p9_debug_level & level) == level) {\
65 if (level == P9_DEBUG_9P) \
66 printk(KERN_NOTICE "(%8.8d) " \
67 format , task_pid_nr(current) , ## arg); \
69 printk(KERN_NOTICE "-- %s (%d): " \
70 format , __func__, task_pid_nr(current) , ## arg); \
75 #define P9_DPRINTK(level, format, arg...) do { } while (0)
78 #define P9_EPRINTK(level, format, arg...) \
80 printk(level "9p: %s (%d): " \
81 format , __func__, task_pid_nr(current), ## arg); \
85 * enum p9_msg_t - 9P message types
86 * @P9_TVERSION: version handshake request
87 * @P9_RVERSION: version handshake response
88 * @P9_TAUTH: request to establish authentication channel
89 * @P9_RAUTH: response with authentication information
90 * @P9_TATTACH: establish user access to file service
91 * @P9_RATTACH: response with top level handle to file hierarchy
92 * @P9_TERROR: not used
93 * @P9_RERROR: response for any failed request
94 * @P9_TFLUSH: request to abort a previous request
95 * @P9_RFLUSH: response when previous request has been cancelled
96 * @P9_TWALK: descend a directory hierarchy
97 * @P9_RWALK: response with new handle for position within hierarchy
98 * @P9_TOPEN: prepare a handle for I/O on an existing file
99 * @P9_ROPEN: response with file access information
100 * @P9_TCREATE: prepare a handle for I/O on a new file
101 * @P9_RCREATE: response with file access information
102 * @P9_TREAD: request to transfer data from a file or directory
103 * @P9_RREAD: response with data requested
104 * @P9_TWRITE: reuqest to transfer data to a file
105 * @P9_RWRITE: response with out much data was transfered to file
106 * @P9_TCLUNK: forget about a handle to an entity within the file system
107 * @P9_RCLUNK: response when server has forgotten about the handle
108 * @P9_TREMOVE: request to remove an entity from the hierarchy
109 * @P9_RREMOVE: response when server has removed the entity
110 * @P9_TSTAT: request file entity attributes
111 * @P9_RSTAT: response with file entity attributes
112 * @P9_TWSTAT: request to update file entity attributes
113 * @P9_RWSTAT: response when file entity attributes are updated
115 * There are 14 basic operations in 9P2000, paired as
116 * requests and responses. The one special case is ERROR
117 * as there is no @P9_TERROR request for clients to transmit to
118 * the server, but the server may respond to any other request
119 * with an @P9_RERROR.
121 * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html
156 * enum p9_open_mode_t - 9P open modes
157 * @P9_OREAD: open file for reading only
158 * @P9_OWRITE: open file for writing only
159 * @P9_ORDWR: open file for reading or writing
160 * @P9_OEXEC: open file for execution
161 * @P9_OTRUNC: truncate file to zero-length before opening it
162 * @P9_OREXEC: close the file when an exec(2) system call is made
163 * @P9_ORCLOSE: remove the file when the file is closed
164 * @P9_OAPPEND: open the file and seek to the end
165 * @P9_OEXCL: only create a file, do not open it
167 * 9P open modes differ slightly from Posix standard modes.
168 * In particular, there are extra modes which specify different
169 * semantic behaviors than may be available on standard Posix
170 * systems. For example, @P9_OREXEC and @P9_ORCLOSE are modes that
171 * most likely will not be issued from the Linux VFS client, but may
172 * be supported by servers.
174 * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
177 enum p9_open_mode_t {
190 * enum p9_perm_t - 9P permissions
191 * @P9_DMDIR: mode bite for directories
192 * @P9_DMAPPEND: mode bit for is append-only
193 * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed)
194 * @P9_DMMOUNT: mode bite for mount points
195 * @P9_DMAUTH: mode bit for authentication file
196 * @P9_DMTMP: mode bit for non-backed-up files
197 * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u)
198 * @P9_DMLINK: mode bit for hard-link (9P2000.u)
199 * @P9_DMDEVICE: mode bit for device files (9P2000.u)
200 * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u)
201 * @P9_DMSOCKET: mode bit for socket (9P2000.u)
202 * @P9_DMSETUID: mode bit for setuid (9P2000.u)
203 * @P9_DMSETGID: mode bit for setgid (9P2000.u)
204 * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u)
206 * 9P permissions differ slightly from Posix standard modes.
208 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
211 P9_DMDIR = 0x80000000,
212 P9_DMAPPEND = 0x40000000,
213 P9_DMEXCL = 0x20000000,
214 P9_DMMOUNT = 0x10000000,
215 P9_DMAUTH = 0x08000000,
216 P9_DMTMP = 0x04000000,
217 /* 9P2000.u extensions */
218 P9_DMSYMLINK = 0x02000000,
219 P9_DMLINK = 0x01000000,
220 P9_DMDEVICE = 0x00800000,
221 P9_DMNAMEDPIPE = 0x00200000,
222 P9_DMSOCKET = 0x00100000,
223 P9_DMSETUID = 0x00080000,
224 P9_DMSETGID = 0x00040000,
225 P9_DMSETVTX = 0x00010000,
229 * enum p9_qid_t - QID types
230 * @P9_QTDIR: directory
231 * @P9_QTAPPEND: append-only
232 * @P9_QTEXCL: excluse use (only one open handle allowed)
233 * @P9_QTMOUNT: mount points
234 * @P9_QTAUTH: authentication file
235 * @P9_QTTMP: non-backed-up files
236 * @P9_QTSYMLINK: symbolic links (9P2000.u)
237 * @P9_QTLINK: hard-link (9P2000.u)
238 * @P9_QTFILE: normal files
240 * QID types are a subset of permissions - they are primarily
241 * used to differentiate semantics for a file system entity via
242 * a jump-table. Their value is also the most signifigant 16 bits
243 * of the permission_t
245 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
259 /* 9P Magic Numbers */
260 #define P9_NOTAG (u16)(~0)
261 #define P9_NOFID (u32)(~0)
262 #define P9_MAXWELEM 16
264 /* ample room for Twrite/Rread header */
265 #define P9_IOHDRSZ 24
268 * struct p9_str - length prefixed string type
269 * @len: length of the string
272 * The protocol uses length prefixed strings for all
273 * string data, so we replicate that for our internal
283 * struct p9_qid - file system entity information
284 * @type: 8-bit type &p9_qid_t
285 * @version: 16-bit monotonically incrementing version number
286 * @path: 64-bit per-server-unique ID for a file system element
288 * qids are identifiers used by 9P servers to track file system
289 * entities. The type is used to differentiate semantics for operations
290 * on the entity (ie. read means something different on a directory than
291 * on a file). The path provides a server unique index for an entity
292 * (roughly analogous to an inode number), while the version is updated
293 * every time a file is modified and can be used to maintain cache
294 * coherency between clients and serves.
295 * Servers will often differentiate purely synthetic entities by setting
296 * their version to 0, signaling that they should never be cached and
297 * should be accessed synchronously.
299 * See Also://plan9.bell-labs.com/magic/man2html/2/stat
309 * struct p9_stat - file system metadata information
310 * @size: length prefix for this stat structure instance
311 * @type: the type of the server (equivilent to a major number)
312 * @dev: the sub-type of the server (equivilent to a minor number)
313 * @qid: unique id from the server of type &p9_qid
314 * @mode: Plan 9 format permissions of type &p9_perm_t
315 * @atime: Last access/read time
316 * @mtime: Last modify/write time
317 * @length: file length
318 * @name: last element of path (aka filename) in type &p9_str
319 * @uid: owner name in type &p9_str
320 * @gid: group owner in type &p9_str
321 * @muid: last modifier in type &p9_str
322 * @extension: area used to encode extended UNIX support in type &p9_str
323 * @n_uid: numeric user id of owner (part of 9p2000.u extension)
324 * @n_gid: numeric group id (part of 9p2000.u extension)
325 * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension)
327 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
343 char *extension; /* 9p2000.u extensions */
344 u32 n_uid; /* 9p2000.u extensions */
345 u32 n_gid; /* 9p2000.u extensions */
346 u32 n_muid; /* 9p2000.u extensions */
349 /* Structures for Protocol Operations */
352 struct p9_str version;
357 struct p9_str version;
364 u32 n_uname; /* 9P2000.u extensions */
373 u32 errno; /* 9p2000.u extension */
388 u32 n_uname; /* 9P2000.u extensions */
399 struct p9_str wnames[16];
404 struct p9_qid wqids[16];
422 struct p9_str extension;
471 struct p9_wstat stat;
476 struct p9_wstat stat;
483 * struct p9_fcall - primary packet structure
484 * @size: prefixed length of the structure
485 * @id: protocol operating identifier of type &p9_msg_t
486 * @tag: transaction id of the request
487 * @offset: used by marshalling routines to track currentposition in buffer
488 * @capacity: used by marshalling routines to track total capacity
491 * &p9_fcall represents the structure for all 9P RPC
492 * transactions. Requests are packaged into fcalls, and reponses
493 * must be extracted from them.
495 * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
511 int p9_errstr2errno(char *errstr, int len);
513 struct p9_idpool *p9_idpool_create(void);
514 void p9_idpool_destroy(struct p9_idpool *);
515 int p9_idpool_get(struct p9_idpool *p);
516 void p9_idpool_put(int id, struct p9_idpool *p);
517 int p9_idpool_check(int id, struct p9_idpool *p);
519 int p9_error_init(void);
520 int p9_errstr2errno(char *, int);
521 int p9_trans_fd_init(void);
522 void p9_trans_fd_exit(void);
523 #endif /* NET_9P_H */