]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/9p/protocol.c
4 * 9P Protocol Support Code
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Base on code from Anthony Liguori <aliguori@us.ibm.com>
9 * Copyright (C) 2008 by IBM, Corp.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2
13 * as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to:
22 * Free Software Foundation
23 * 51 Franklin Street, Fifth Floor
24 * Boston, MA 02111-1301 USA
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <net/9p/9p.h>
31 #include <net/9p/client.h>
35 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
39 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
43 #define offset_of(type, memb) \
44 ((unsigned long)(&((type *)0)->memb))
47 #define container_of(obj, type, memb) \
48 ((type *)(((char *)obj) - offset_of(type, memb)))
52 p9pdu_writef(struct p9_fcall
*pdu
, int optional
, const char *fmt
, ...);
54 void p9stat_free(struct p9_wstat
*stbuf
)
60 kfree(stbuf
->extension
);
62 EXPORT_SYMBOL(p9stat_free
);
64 static size_t pdu_read(struct p9_fcall
*pdu
, void *data
, size_t size
)
66 size_t len
= MIN(pdu
->size
- pdu
->offset
, size
);
67 memcpy(data
, &pdu
->sdata
[pdu
->offset
], len
);
72 static size_t pdu_write(struct p9_fcall
*pdu
, const void *data
, size_t size
)
74 size_t len
= MIN(pdu
->capacity
- pdu
->size
, size
);
75 memcpy(&pdu
->sdata
[pdu
->size
], data
, len
);
88 D - data blob (int32_t size followed by void *, results are not freed)
89 T - array of strings (int16_t count, followed by strings)
90 R - array of qids (int16_t count, followed by qids)
91 ? - if optional = 1, continue parsing
95 p9pdu_vreadf(struct p9_fcall
*pdu
, int optional
, const char *fmt
, va_list ap
)
100 for (ptr
= fmt
; *ptr
; ptr
++) {
103 int8_t *val
= va_arg(ap
, int8_t *);
104 if (pdu_read(pdu
, val
, sizeof(*val
))) {
111 int16_t *val
= va_arg(ap
, int16_t *);
112 if (pdu_read(pdu
, val
, sizeof(*val
))) {
116 *val
= cpu_to_le16(*val
);
120 int32_t *val
= va_arg(ap
, int32_t *);
121 if (pdu_read(pdu
, val
, sizeof(*val
))) {
125 *val
= cpu_to_le32(*val
);
129 int64_t *val
= va_arg(ap
, int64_t *);
130 if (pdu_read(pdu
, val
, sizeof(*val
))) {
134 *val
= cpu_to_le64(*val
);
138 char **ptr
= va_arg(ap
, char **);
142 errcode
= p9pdu_readf(pdu
, optional
, "w", &len
);
148 *ptr
= kmalloc(size
+ 1, GFP_KERNEL
);
153 if (pdu_read(pdu
, *ptr
, size
)) {
163 va_arg(ap
, struct p9_qid
*);
165 errcode
= p9pdu_readf(pdu
, optional
, "bdq",
166 &qid
->type
, &qid
->version
,
171 struct p9_wstat
*stbuf
=
172 va_arg(ap
, struct p9_wstat
*);
174 stbuf
->extension
= NULL
;
175 stbuf
->n_uid
= stbuf
->n_gid
= stbuf
->n_muid
=
179 p9pdu_readf(pdu
, optional
,
181 &stbuf
->size
, &stbuf
->type
,
182 &stbuf
->dev
, &stbuf
->qid
,
183 &stbuf
->mode
, &stbuf
->atime
,
184 &stbuf
->mtime
, &stbuf
->length
,
185 &stbuf
->name
, &stbuf
->uid
,
186 &stbuf
->gid
, &stbuf
->muid
,
188 &stbuf
->n_uid
, &stbuf
->n_gid
,
195 int32_t *count
= va_arg(ap
, int32_t *);
196 void **data
= va_arg(ap
, void **);
199 p9pdu_readf(pdu
, optional
, "d", count
);
203 pdu
->size
- pdu
->offset
);
204 *data
= &pdu
->sdata
[pdu
->offset
];
209 int16_t *nwname
= va_arg(ap
, int16_t *);
210 char ***wnames
= va_arg(ap
, char ***);
213 p9pdu_readf(pdu
, optional
, "w", nwname
);
216 kmalloc(sizeof(char *) * *nwname
,
225 for (i
= 0; i
< *nwname
; i
++) {
227 p9pdu_readf(pdu
, optional
,
239 for (i
= 0; i
< *nwname
; i
++)
248 int16_t *nwqid
= va_arg(ap
, int16_t *);
249 struct p9_qid
**wqids
=
250 va_arg(ap
, struct p9_qid
**);
255 p9pdu_readf(pdu
, optional
, "w", nwqid
);
259 sizeof(struct p9_qid
),
268 for (i
= 0; i
< *nwqid
; i
++) {
270 p9pdu_readf(pdu
, optional
,
301 p9pdu_vwritef(struct p9_fcall
*pdu
, int optional
, const char *fmt
, va_list ap
)
306 for (ptr
= fmt
; *ptr
; ptr
++) {
309 int8_t val
= va_arg(ap
, int);
310 if (pdu_write(pdu
, &val
, sizeof(val
)))
315 int16_t val
= va_arg(ap
, int);
316 if (pdu_write(pdu
, &val
, sizeof(val
)))
321 int32_t val
= va_arg(ap
, int32_t);
322 if (pdu_write(pdu
, &val
, sizeof(val
)))
327 int64_t val
= va_arg(ap
, int64_t);
328 if (pdu_write(pdu
, &val
, sizeof(val
)))
333 const char *ptr
= va_arg(ap
, const char *);
337 len
= MIN(strlen(ptr
), USHORT_MAX
);
339 errcode
= p9pdu_writef(pdu
, optional
, "w", len
);
340 if (!errcode
&& pdu_write(pdu
, ptr
, len
))
345 const struct p9_qid
*qid
=
346 va_arg(ap
, const struct p9_qid
*);
348 p9pdu_writef(pdu
, optional
, "bdq",
349 qid
->type
, qid
->version
,
353 const struct p9_wstat
*stbuf
=
354 va_arg(ap
, const struct p9_wstat
*);
356 p9pdu_writef(pdu
, optional
,
358 stbuf
->size
, stbuf
->type
,
359 stbuf
->dev
, stbuf
->qid
,
360 stbuf
->mode
, stbuf
->atime
,
361 stbuf
->mtime
, stbuf
->length
,
362 stbuf
->name
, stbuf
->uid
,
363 stbuf
->gid
, stbuf
->muid
,
364 stbuf
->extension
, stbuf
->n_uid
,
365 stbuf
->n_gid
, stbuf
->n_muid
);
368 int32_t count
= va_arg(ap
, int32_t);
369 const void *data
= va_arg(ap
, const void *);
372 p9pdu_writef(pdu
, optional
, "d", count
);
373 if (!errcode
&& pdu_write(pdu
, data
, count
))
378 int16_t nwname
= va_arg(ap
, int);
379 const char **wnames
= va_arg(ap
, const char **);
382 p9pdu_writef(pdu
, optional
, "w", nwname
);
386 for (i
= 0; i
< nwname
; i
++) {
388 p9pdu_writef(pdu
, optional
,
398 int16_t nwqid
= va_arg(ap
, int);
399 struct p9_qid
*wqids
=
400 va_arg(ap
, struct p9_qid
*);
403 p9pdu_writef(pdu
, optional
, "w", nwqid
);
407 for (i
= 0; i
< nwqid
; i
++) {
409 p9pdu_writef(pdu
, optional
,
434 int p9pdu_readf(struct p9_fcall
*pdu
, int optional
, const char *fmt
, ...)
440 ret
= p9pdu_vreadf(pdu
, optional
, fmt
, ap
);
447 p9pdu_writef(struct p9_fcall
*pdu
, int optional
, const char *fmt
, ...)
453 ret
= p9pdu_vwritef(pdu
, optional
, fmt
, ap
);