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
41 * @P9_DEBUG_PKT: packet marshalling/unmarshalling
42 * @P9_DEBUG_FSC: FS-cache tracing
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.
49 P9_DEBUG_ERROR
= (1<<0),
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),
62 #ifdef CONFIG_NET_9P_DEBUG
63 extern unsigned int p9_debug_level
;
65 #define P9_DPRINTK(level, format, arg...) \
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); \
72 printk(KERN_NOTICE "-- %s (%d): " \
73 format , __func__, task_pid_nr(current) , ## arg); \
78 #define P9_DPRINTK(level, format, arg...) do { } while (0)
81 #define P9_EPRINTK(level, format, arg...) \
83 printk(level "9p: %s (%d): " \
84 format , __func__, task_pid_nr(current), ## arg); \
88 * enum p9_msg_t - 9P message types
89 * @P9_TSTATFS: file system status request
90 * @P9_RSTATFS: file system status response
91 * @P9_TRENAME: rename request
92 * @P9_RRENAME: rename response
93 * @P9_TVERSION: version handshake request
94 * @P9_RVERSION: version handshake response
95 * @P9_TAUTH: request to establish authentication channel
96 * @P9_RAUTH: response with authentication information
97 * @P9_TATTACH: establish user access to file service
98 * @P9_RATTACH: response with top level handle to file hierarchy
99 * @P9_TERROR: not used
100 * @P9_RERROR: response for any failed request
101 * @P9_TFLUSH: request to abort a previous request
102 * @P9_RFLUSH: response when previous request has been cancelled
103 * @P9_TWALK: descend a directory hierarchy
104 * @P9_RWALK: response with new handle for position within hierarchy
105 * @P9_TOPEN: prepare a handle for I/O on an existing file
106 * @P9_ROPEN: response with file access information
107 * @P9_TCREATE: prepare a handle for I/O on a new file
108 * @P9_RCREATE: response with file access information
109 * @P9_TREAD: request to transfer data from a file or directory
110 * @P9_RREAD: response with data requested
111 * @P9_TWRITE: reuqest to transfer data to a file
112 * @P9_RWRITE: response with out much data was transfered to file
113 * @P9_TCLUNK: forget about a handle to an entity within the file system
114 * @P9_RCLUNK: response when server has forgotten about the handle
115 * @P9_TREMOVE: request to remove an entity from the hierarchy
116 * @P9_RREMOVE: response when server has removed the entity
117 * @P9_TSTAT: request file entity attributes
118 * @P9_RSTAT: response with file entity attributes
119 * @P9_TWSTAT: request to update file entity attributes
120 * @P9_RWSTAT: response when file entity attributes are updated
122 * There are 14 basic operations in 9P2000, paired as
123 * requests and responses. The one special case is ERROR
124 * as there is no @P9_TERROR request for clients to transmit to
125 * the server, but the server may respond to any other request
126 * with an @P9_RERROR.
128 * See Also: http://plan9.bell-labs.com/sys/man/5/INDEX.html
167 * enum p9_open_mode_t - 9P open modes
168 * @P9_OREAD: open file for reading only
169 * @P9_OWRITE: open file for writing only
170 * @P9_ORDWR: open file for reading or writing
171 * @P9_OEXEC: open file for execution
172 * @P9_OTRUNC: truncate file to zero-length before opening it
173 * @P9_OREXEC: close the file when an exec(2) system call is made
174 * @P9_ORCLOSE: remove the file when the file is closed
175 * @P9_OAPPEND: open the file and seek to the end
176 * @P9_OEXCL: only create a file, do not open it
178 * 9P open modes differ slightly from Posix standard modes.
179 * In particular, there are extra modes which specify different
180 * semantic behaviors than may be available on standard Posix
181 * systems. For example, @P9_OREXEC and @P9_ORCLOSE are modes that
182 * most likely will not be issued from the Linux VFS client, but may
183 * be supported by servers.
185 * See Also: http://plan9.bell-labs.com/magic/man2html/2/open
188 enum p9_open_mode_t
{
201 * enum p9_perm_t - 9P permissions
202 * @P9_DMDIR: mode bite for directories
203 * @P9_DMAPPEND: mode bit for is append-only
204 * @P9_DMEXCL: mode bit for excluse use (only one open handle allowed)
205 * @P9_DMMOUNT: mode bite for mount points
206 * @P9_DMAUTH: mode bit for authentication file
207 * @P9_DMTMP: mode bit for non-backed-up files
208 * @P9_DMSYMLINK: mode bit for symbolic links (9P2000.u)
209 * @P9_DMLINK: mode bit for hard-link (9P2000.u)
210 * @P9_DMDEVICE: mode bit for device files (9P2000.u)
211 * @P9_DMNAMEDPIPE: mode bit for named pipe (9P2000.u)
212 * @P9_DMSOCKET: mode bit for socket (9P2000.u)
213 * @P9_DMSETUID: mode bit for setuid (9P2000.u)
214 * @P9_DMSETGID: mode bit for setgid (9P2000.u)
215 * @P9_DMSETVTX: mode bit for sticky bit (9P2000.u)
217 * 9P permissions differ slightly from Posix standard modes.
219 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
222 P9_DMDIR
= 0x80000000,
223 P9_DMAPPEND
= 0x40000000,
224 P9_DMEXCL
= 0x20000000,
225 P9_DMMOUNT
= 0x10000000,
226 P9_DMAUTH
= 0x08000000,
227 P9_DMTMP
= 0x04000000,
228 /* 9P2000.u extensions */
229 P9_DMSYMLINK
= 0x02000000,
230 P9_DMLINK
= 0x01000000,
231 P9_DMDEVICE
= 0x00800000,
232 P9_DMNAMEDPIPE
= 0x00200000,
233 P9_DMSOCKET
= 0x00100000,
234 P9_DMSETUID
= 0x00080000,
235 P9_DMSETGID
= 0x00040000,
236 P9_DMSETVTX
= 0x00010000,
240 * enum p9_qid_t - QID types
241 * @P9_QTDIR: directory
242 * @P9_QTAPPEND: append-only
243 * @P9_QTEXCL: excluse use (only one open handle allowed)
244 * @P9_QTMOUNT: mount points
245 * @P9_QTAUTH: authentication file
246 * @P9_QTTMP: non-backed-up files
247 * @P9_QTSYMLINK: symbolic links (9P2000.u)
248 * @P9_QTLINK: hard-link (9P2000.u)
249 * @P9_QTFILE: normal files
251 * QID types are a subset of permissions - they are primarily
252 * used to differentiate semantics for a file system entity via
253 * a jump-table. Their value is also the most signifigant 16 bits
254 * of the permission_t
256 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
270 /* 9P Magic Numbers */
271 #define P9_NOTAG (u16)(~0)
272 #define P9_NOFID (u32)(~0)
273 #define P9_MAXWELEM 16
275 /* ample room for Twrite/Rread header */
276 #define P9_IOHDRSZ 24
279 * struct p9_str - length prefixed string type
280 * @len: length of the string
283 * The protocol uses length prefixed strings for all
284 * string data, so we replicate that for our internal
294 * struct p9_qid - file system entity information
295 * @type: 8-bit type &p9_qid_t
296 * @version: 16-bit monotonically incrementing version number
297 * @path: 64-bit per-server-unique ID for a file system element
299 * qids are identifiers used by 9P servers to track file system
300 * entities. The type is used to differentiate semantics for operations
301 * on the entity (ie. read means something different on a directory than
302 * on a file). The path provides a server unique index for an entity
303 * (roughly analogous to an inode number), while the version is updated
304 * every time a file is modified and can be used to maintain cache
305 * coherency between clients and serves.
306 * Servers will often differentiate purely synthetic entities by setting
307 * their version to 0, signaling that they should never be cached and
308 * should be accessed synchronously.
310 * See Also://plan9.bell-labs.com/magic/man2html/2/stat
320 * struct p9_stat - file system metadata information
321 * @size: length prefix for this stat structure instance
322 * @type: the type of the server (equivilent to a major number)
323 * @dev: the sub-type of the server (equivilent to a minor number)
324 * @qid: unique id from the server of type &p9_qid
325 * @mode: Plan 9 format permissions of type &p9_perm_t
326 * @atime: Last access/read time
327 * @mtime: Last modify/write time
328 * @length: file length
329 * @name: last element of path (aka filename) in type &p9_str
330 * @uid: owner name in type &p9_str
331 * @gid: group owner in type &p9_str
332 * @muid: last modifier in type &p9_str
333 * @extension: area used to encode extended UNIX support in type &p9_str
334 * @n_uid: numeric user id of owner (part of 9p2000.u extension)
335 * @n_gid: numeric group id (part of 9p2000.u extension)
336 * @n_muid: numeric user id of laster modifier (part of 9p2000.u extension)
338 * See Also: http://plan9.bell-labs.com/magic/man2html/2/stat
354 char *extension
; /* 9p2000.u extensions */
355 u32 n_uid
; /* 9p2000.u extensions */
356 u32 n_gid
; /* 9p2000.u extensions */
357 u32 n_muid
; /* 9p2000.u extensions */
360 /* Structures for Protocol Operations */
388 struct p9_str version
;
393 struct p9_str version
;
400 u32 n_uname
; /* 9P2000.u extensions */
409 u32 errno
; /* 9p2000.u extension */
424 u32 n_uname
; /* 9P2000.u extensions */
435 struct p9_str wnames
[16];
440 struct p9_qid wqids
[16];
458 struct p9_str extension
;
507 struct p9_wstat stat
;
512 struct p9_wstat stat
;
519 * struct p9_fcall - primary packet structure
520 * @size: prefixed length of the structure
521 * @id: protocol operating identifier of type &p9_msg_t
522 * @tag: transaction id of the request
523 * @offset: used by marshalling routines to track currentposition in buffer
524 * @capacity: used by marshalling routines to track total capacity
527 * &p9_fcall represents the structure for all 9P RPC
528 * transactions. Requests are packaged into fcalls, and reponses
529 * must be extracted from them.
531 * See Also: http://plan9.bell-labs.com/magic/man2html/2/fcall
547 int p9_errstr2errno(char *errstr
, int len
);
549 struct p9_idpool
*p9_idpool_create(void);
550 void p9_idpool_destroy(struct p9_idpool
*);
551 int p9_idpool_get(struct p9_idpool
*p
);
552 void p9_idpool_put(int id
, struct p9_idpool
*p
);
553 int p9_idpool_check(int id
, struct p9_idpool
*p
);
555 int p9_error_init(void);
556 int p9_errstr2errno(char *, int);
557 int p9_trans_fd_init(void);
558 void p9_trans_fd_exit(void);
559 #endif /* NET_9P_H */