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 <linux/uaccess.h>
31 #include <linux/slab.h>
32 #include <linux/sched.h>
33 #include <linux/types.h>
34 #include <net/9p/9p.h>
35 #include <net/9p/client.h>
39 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
43 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
47 #define offset_of(type, memb) \
48 ((unsigned long)(&((type *)0)->memb))
51 #define container_of(obj, type, memb) \
52 ((type *)(((char *)obj) - offset_of(type, memb)))
56 p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
58 #ifdef CONFIG_NET_9P_DEBUG
60 p9pdu_dump(int way, struct p9_fcall *pdu)
63 u8 *data = pdu->sdata;
64 int datalen = pdu->size;
69 if (datalen > (buflen-16))
72 n += scnprintf(buf + n, buflen - n, "%02x ", data[i]);
74 n += scnprintf(buf + n, buflen - n, " ");
76 n += scnprintf(buf + n, buflen - n, "\n");
80 n += scnprintf(buf + n, buflen - n, "\n");
83 P9_DPRINTK(P9_DEBUG_PKT, "[[[(%d) %s\n", datalen, buf);
85 P9_DPRINTK(P9_DEBUG_PKT, "]]](%d) %s\n", datalen, buf);
89 p9pdu_dump(int way, struct p9_fcall *pdu)
93 EXPORT_SYMBOL(p9pdu_dump);
95 void p9stat_free(struct p9_wstat *stbuf)
101 kfree(stbuf->extension);
103 EXPORT_SYMBOL(p9stat_free);
105 static size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size)
107 size_t len = MIN(pdu->size - pdu->offset, size);
108 memcpy(data, &pdu->sdata[pdu->offset], len);
113 static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
115 size_t len = MIN(pdu->capacity - pdu->size, size);
116 memcpy(&pdu->sdata[pdu->size], data, len);
122 pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
124 size_t len = MIN(pdu->capacity - pdu->size, size);
125 int err = copy_from_user(&pdu->sdata[pdu->size], udata, len);
127 printk(KERN_WARNING "pdu_write_u returning: %d\n", err);
141 D - data blob (int32_t size followed by void *, results are not freed)
142 T - array of strings (int16_t count, followed by strings)
143 R - array of qids (int16_t count, followed by qids)
144 A - stat for 9p2000.L (p9_stat_dotl)
145 ? - if optional = 1, continue parsing
149 p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
155 for (ptr = fmt; *ptr; ptr++) {
158 int8_t *val = va_arg(ap, int8_t *);
159 if (pdu_read(pdu, val, sizeof(*val))) {
166 int16_t *val = va_arg(ap, int16_t *);
168 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
172 *val = le16_to_cpu(le_val);
176 int32_t *val = va_arg(ap, int32_t *);
178 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
182 *val = le32_to_cpu(le_val);
186 int64_t *val = va_arg(ap, int64_t *);
188 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
192 *val = le64_to_cpu(le_val);
196 char **sptr = va_arg(ap, char **);
200 errcode = p9pdu_readf(pdu, proto_version,
207 *sptr = kmalloc(size + 1, GFP_KERNEL);
212 if (pdu_read(pdu, *sptr, size)) {
222 va_arg(ap, struct p9_qid *);
224 errcode = p9pdu_readf(pdu, proto_version, "bdq",
225 &qid->type, &qid->version,
230 struct p9_wstat *stbuf =
231 va_arg(ap, struct p9_wstat *);
233 memset(stbuf, 0, sizeof(struct p9_wstat));
234 stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
237 p9pdu_readf(pdu, proto_version,
239 &stbuf->size, &stbuf->type,
240 &stbuf->dev, &stbuf->qid,
241 &stbuf->mode, &stbuf->atime,
242 &stbuf->mtime, &stbuf->length,
243 &stbuf->name, &stbuf->uid,
244 &stbuf->gid, &stbuf->muid,
246 &stbuf->n_uid, &stbuf->n_gid,
253 int32_t *count = va_arg(ap, int32_t *);
254 void **data = va_arg(ap, void **);
257 p9pdu_readf(pdu, proto_version, "d", count);
261 pdu->size - pdu->offset);
262 *data = &pdu->sdata[pdu->offset];
267 int16_t *nwname = va_arg(ap, int16_t *);
268 char ***wnames = va_arg(ap, char ***);
270 errcode = p9pdu_readf(pdu, proto_version,
274 kmalloc(sizeof(char *) * *nwname,
283 for (i = 0; i < *nwname; i++) {
298 for (i = 0; i < *nwname; i++)
307 int16_t *nwqid = va_arg(ap, int16_t *);
308 struct p9_qid **wqids =
309 va_arg(ap, struct p9_qid **);
314 p9pdu_readf(pdu, proto_version, "w", nwqid);
318 sizeof(struct p9_qid),
327 for (i = 0; i < *nwqid; i++) {
345 struct p9_stat_dotl *stbuf =
346 va_arg(ap, struct p9_stat_dotl *);
348 memset(stbuf, 0, sizeof(struct p9_stat_dotl));
350 p9pdu_readf(pdu, proto_version,
351 "qQdddqqqqqqqqqqqqqqq",
352 &stbuf->st_result_mask,
355 &stbuf->st_uid, &stbuf->st_gid,
357 &stbuf->st_rdev, &stbuf->st_size,
358 &stbuf->st_blksize, &stbuf->st_blocks,
359 &stbuf->st_atime_sec,
360 &stbuf->st_atime_nsec,
361 &stbuf->st_mtime_sec,
362 &stbuf->st_mtime_nsec,
363 &stbuf->st_ctime_sec,
364 &stbuf->st_ctime_nsec,
365 &stbuf->st_btime_sec,
366 &stbuf->st_btime_nsec,
368 &stbuf->st_data_version);
372 if ((proto_version != p9_proto_2000u) &&
373 (proto_version != p9_proto_2000L))
389 p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
395 for (ptr = fmt; *ptr; ptr++) {
398 int8_t val = va_arg(ap, int);
399 if (pdu_write(pdu, &val, sizeof(val)))
404 __le16 val = cpu_to_le16(va_arg(ap, int));
405 if (pdu_write(pdu, &val, sizeof(val)))
410 __le32 val = cpu_to_le32(va_arg(ap, int32_t));
411 if (pdu_write(pdu, &val, sizeof(val)))
416 __le64 val = cpu_to_le64(va_arg(ap, int64_t));
417 if (pdu_write(pdu, &val, sizeof(val)))
422 const char *sptr = va_arg(ap, const char *);
425 len = MIN(strlen(sptr), USHRT_MAX);
427 errcode = p9pdu_writef(pdu, proto_version,
429 if (!errcode && pdu_write(pdu, sptr, len))
434 const struct p9_qid *qid =
435 va_arg(ap, const struct p9_qid *);
437 p9pdu_writef(pdu, proto_version, "bdq",
438 qid->type, qid->version,
442 const struct p9_wstat *stbuf =
443 va_arg(ap, const struct p9_wstat *);
445 p9pdu_writef(pdu, proto_version,
447 stbuf->size, stbuf->type,
448 stbuf->dev, &stbuf->qid,
449 stbuf->mode, stbuf->atime,
450 stbuf->mtime, stbuf->length,
451 stbuf->name, stbuf->uid,
452 stbuf->gid, stbuf->muid,
453 stbuf->extension, stbuf->n_uid,
454 stbuf->n_gid, stbuf->n_muid);
457 int32_t count = va_arg(ap, int32_t);
458 const void *data = va_arg(ap, const void *);
460 errcode = p9pdu_writef(pdu, proto_version, "d",
462 if (!errcode && pdu_write(pdu, data, count))
467 int32_t count = va_arg(ap, int32_t);
468 const char __user *udata =
469 va_arg(ap, const void __user *);
470 errcode = p9pdu_writef(pdu, proto_version, "d",
472 if (!errcode && pdu_write_u(pdu, udata, count))
477 int16_t nwname = va_arg(ap, int);
478 const char **wnames = va_arg(ap, const char **);
480 errcode = p9pdu_writef(pdu, proto_version, "w",
485 for (i = 0; i < nwname; i++) {
498 int16_t nwqid = va_arg(ap, int);
499 struct p9_qid *wqids =
500 va_arg(ap, struct p9_qid *);
502 errcode = p9pdu_writef(pdu, proto_version, "w",
507 for (i = 0; i < nwqid; i++) {
520 struct p9_iattr_dotl *p9attr = va_arg(ap,
521 struct p9_iattr_dotl *);
523 errcode = p9pdu_writef(pdu, proto_version,
537 if ((proto_version != p9_proto_2000u) &&
538 (proto_version != p9_proto_2000L))
553 int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
559 ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
566 p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
572 ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
578 int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version)
580 struct p9_fcall fake_pdu;
584 fake_pdu.capacity = len;
585 fake_pdu.sdata = buf;
588 ret = p9pdu_readf(&fake_pdu, proto_version, "S", st);
590 P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
591 p9pdu_dump(1, &fake_pdu);
596 EXPORT_SYMBOL(p9stat_read);
598 int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
600 return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
603 int p9pdu_finalize(struct p9_fcall *pdu)
605 int size = pdu->size;
609 err = p9pdu_writef(pdu, 0, "d", size);
612 #ifdef CONFIG_NET_9P_DEBUG
613 if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT)
617 P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size,
623 void p9pdu_reset(struct p9_fcall *pdu)
629 int p9dirent_read(char *buf, int len, struct p9_dirent *dirent,
632 struct p9_fcall fake_pdu;
637 fake_pdu.capacity = len;
638 fake_pdu.sdata = buf;
641 ret = p9pdu_readf(&fake_pdu, proto_version, "Qqbs", &dirent->qid,
642 &dirent->d_off, &dirent->d_type, &nameptr);
644 P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret);
645 p9pdu_dump(1, &fake_pdu);
649 strcpy(dirent->d_name, nameptr);
652 return fake_pdu.offset;
654 EXPORT_SYMBOL(p9dirent_read);