Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 1 | /* |
| 2 | * net/9p/conv.c |
| 3 | * |
| 4 | * 9P protocol conversion functions |
| 5 | * |
| 6 | * Copyright (C) 2004, 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> |
| 9 | * |
| 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. |
| 13 | * |
| 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. |
| 18 | * |
| 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 |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/fs.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/idr.h> |
| 32 | #include <linux/uaccess.h> |
| 33 | #include <net/9p/9p.h> |
| 34 | |
| 35 | /* |
| 36 | * Buffer to help with string parsing |
| 37 | */ |
| 38 | struct cbuf { |
| 39 | unsigned char *sp; |
| 40 | unsigned char *p; |
| 41 | unsigned char *ep; |
| 42 | }; |
| 43 | |
| 44 | static inline void buf_init(struct cbuf *buf, void *data, int datalen) |
| 45 | { |
| 46 | buf->sp = buf->p = data; |
| 47 | buf->ep = data + datalen; |
| 48 | } |
| 49 | |
| 50 | static inline int buf_check_overflow(struct cbuf *buf) |
| 51 | { |
| 52 | return buf->p > buf->ep; |
| 53 | } |
| 54 | |
| 55 | static int buf_check_size(struct cbuf *buf, int len) |
| 56 | { |
| 57 | if (buf->p + len > buf->ep) { |
| 58 | if (buf->p < buf->ep) { |
| 59 | P9_EPRINTK(KERN_ERR, |
| 60 | "buffer overflow: want %d has %d\n", len, |
| 61 | (int)(buf->ep - buf->p)); |
| 62 | dump_stack(); |
| 63 | buf->p = buf->ep + 1; |
| 64 | } |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | return 1; |
| 70 | } |
| 71 | |
| 72 | static void *buf_alloc(struct cbuf *buf, int len) |
| 73 | { |
| 74 | void *ret = NULL; |
| 75 | |
| 76 | if (buf_check_size(buf, len)) { |
| 77 | ret = buf->p; |
| 78 | buf->p += len; |
| 79 | } |
| 80 | |
| 81 | return ret; |
| 82 | } |
| 83 | |
| 84 | static void buf_put_int8(struct cbuf *buf, u8 val) |
| 85 | { |
| 86 | if (buf_check_size(buf, 1)) { |
| 87 | buf->p[0] = val; |
| 88 | buf->p++; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | static void buf_put_int16(struct cbuf *buf, u16 val) |
| 93 | { |
| 94 | if (buf_check_size(buf, 2)) { |
| 95 | *(__le16 *) buf->p = cpu_to_le16(val); |
| 96 | buf->p += 2; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | static void buf_put_int32(struct cbuf *buf, u32 val) |
| 101 | { |
| 102 | if (buf_check_size(buf, 4)) { |
| 103 | *(__le32 *)buf->p = cpu_to_le32(val); |
| 104 | buf->p += 4; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | static void buf_put_int64(struct cbuf *buf, u64 val) |
| 109 | { |
| 110 | if (buf_check_size(buf, 8)) { |
| 111 | *(__le64 *)buf->p = cpu_to_le64(val); |
| 112 | buf->p += 8; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static char *buf_put_stringn(struct cbuf *buf, const char *s, u16 slen) |
| 117 | { |
| 118 | char *ret; |
| 119 | |
| 120 | ret = NULL; |
| 121 | if (buf_check_size(buf, slen + 2)) { |
| 122 | buf_put_int16(buf, slen); |
| 123 | ret = buf->p; |
| 124 | memcpy(buf->p, s, slen); |
| 125 | buf->p += slen; |
| 126 | } |
| 127 | |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | static inline void buf_put_string(struct cbuf *buf, const char *s) |
| 132 | { |
| 133 | buf_put_stringn(buf, s, strlen(s)); |
| 134 | } |
| 135 | |
| 136 | static u8 buf_get_int8(struct cbuf *buf) |
| 137 | { |
| 138 | u8 ret = 0; |
| 139 | |
| 140 | if (buf_check_size(buf, 1)) { |
| 141 | ret = buf->p[0]; |
| 142 | buf->p++; |
| 143 | } |
| 144 | |
| 145 | return ret; |
| 146 | } |
| 147 | |
| 148 | static u16 buf_get_int16(struct cbuf *buf) |
| 149 | { |
| 150 | u16 ret = 0; |
| 151 | |
| 152 | if (buf_check_size(buf, 2)) { |
| 153 | ret = le16_to_cpu(*(__le16 *)buf->p); |
| 154 | buf->p += 2; |
| 155 | } |
| 156 | |
| 157 | return ret; |
| 158 | } |
| 159 | |
| 160 | static u32 buf_get_int32(struct cbuf *buf) |
| 161 | { |
| 162 | u32 ret = 0; |
| 163 | |
| 164 | if (buf_check_size(buf, 4)) { |
| 165 | ret = le32_to_cpu(*(__le32 *)buf->p); |
| 166 | buf->p += 4; |
| 167 | } |
| 168 | |
| 169 | return ret; |
| 170 | } |
| 171 | |
| 172 | static u64 buf_get_int64(struct cbuf *buf) |
| 173 | { |
| 174 | u64 ret = 0; |
| 175 | |
| 176 | if (buf_check_size(buf, 8)) { |
| 177 | ret = le64_to_cpu(*(__le64 *)buf->p); |
| 178 | buf->p += 8; |
| 179 | } |
| 180 | |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | static void buf_get_str(struct cbuf *buf, struct p9_str *vstr) |
| 185 | { |
| 186 | vstr->len = buf_get_int16(buf); |
| 187 | if (!buf_check_overflow(buf) && buf_check_size(buf, vstr->len)) { |
| 188 | vstr->str = buf->p; |
| 189 | buf->p += vstr->len; |
| 190 | } else { |
| 191 | vstr->len = 0; |
| 192 | vstr->str = NULL; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | static void buf_get_qid(struct cbuf *bufp, struct p9_qid *qid) |
| 197 | { |
| 198 | qid->type = buf_get_int8(bufp); |
| 199 | qid->version = buf_get_int32(bufp); |
| 200 | qid->path = buf_get_int64(bufp); |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * p9_size_wstat - calculate the size of a variable length stat struct |
| 205 | * @stat: metadata (stat) structure |
| 206 | * @dotu: non-zero if 9P2000.u |
| 207 | * |
| 208 | */ |
| 209 | |
| 210 | static int p9_size_wstat(struct p9_wstat *wstat, int dotu) |
| 211 | { |
| 212 | int size = 0; |
| 213 | |
| 214 | if (wstat == NULL) { |
| 215 | P9_EPRINTK(KERN_ERR, "p9_size_stat: got a NULL stat pointer\n"); |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | size = /* 2 + *//* size[2] */ |
| 220 | 2 + /* type[2] */ |
| 221 | 4 + /* dev[4] */ |
| 222 | 1 + /* qid.type[1] */ |
| 223 | 4 + /* qid.vers[4] */ |
| 224 | 8 + /* qid.path[8] */ |
| 225 | 4 + /* mode[4] */ |
| 226 | 4 + /* atime[4] */ |
| 227 | 4 + /* mtime[4] */ |
| 228 | 8 + /* length[8] */ |
| 229 | 8; /* minimum sum of string lengths */ |
| 230 | |
| 231 | if (wstat->name) |
| 232 | size += strlen(wstat->name); |
| 233 | if (wstat->uid) |
| 234 | size += strlen(wstat->uid); |
| 235 | if (wstat->gid) |
| 236 | size += strlen(wstat->gid); |
| 237 | if (wstat->muid) |
| 238 | size += strlen(wstat->muid); |
| 239 | |
| 240 | if (dotu) { |
| 241 | size += 4 + /* n_uid[4] */ |
| 242 | 4 + /* n_gid[4] */ |
| 243 | 4 + /* n_muid[4] */ |
| 244 | 2; /* string length of extension[4] */ |
| 245 | if (wstat->extension) |
| 246 | size += strlen(wstat->extension); |
| 247 | } |
| 248 | |
| 249 | return size; |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * buf_get_stat - safely decode a recieved metadata (stat) structure |
| 254 | * @bufp: buffer to deserialize |
| 255 | * @stat: metadata (stat) structure |
| 256 | * @dotu: non-zero if 9P2000.u |
| 257 | * |
| 258 | */ |
| 259 | |
| 260 | static void |
| 261 | buf_get_stat(struct cbuf *bufp, struct p9_stat *stat, int dotu) |
| 262 | { |
| 263 | stat->size = buf_get_int16(bufp); |
| 264 | stat->type = buf_get_int16(bufp); |
| 265 | stat->dev = buf_get_int32(bufp); |
| 266 | stat->qid.type = buf_get_int8(bufp); |
| 267 | stat->qid.version = buf_get_int32(bufp); |
| 268 | stat->qid.path = buf_get_int64(bufp); |
| 269 | stat->mode = buf_get_int32(bufp); |
| 270 | stat->atime = buf_get_int32(bufp); |
| 271 | stat->mtime = buf_get_int32(bufp); |
| 272 | stat->length = buf_get_int64(bufp); |
| 273 | buf_get_str(bufp, &stat->name); |
| 274 | buf_get_str(bufp, &stat->uid); |
| 275 | buf_get_str(bufp, &stat->gid); |
| 276 | buf_get_str(bufp, &stat->muid); |
| 277 | |
| 278 | if (dotu) { |
| 279 | buf_get_str(bufp, &stat->extension); |
| 280 | stat->n_uid = buf_get_int32(bufp); |
| 281 | stat->n_gid = buf_get_int32(bufp); |
| 282 | stat->n_muid = buf_get_int32(bufp); |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * p9_deserialize_stat - decode a received metadata structure |
| 288 | * @buf: buffer to deserialize |
| 289 | * @buflen: length of received buffer |
| 290 | * @stat: metadata structure to decode into |
| 291 | * @dotu: non-zero if 9P2000.u |
| 292 | * |
| 293 | * Note: stat will point to the buf region. |
| 294 | */ |
| 295 | |
| 296 | int |
| 297 | p9_deserialize_stat(void *buf, u32 buflen, struct p9_stat *stat, |
| 298 | int dotu) |
| 299 | { |
| 300 | struct cbuf buffer; |
| 301 | struct cbuf *bufp = &buffer; |
| 302 | unsigned char *p; |
| 303 | |
| 304 | buf_init(bufp, buf, buflen); |
| 305 | p = bufp->p; |
| 306 | buf_get_stat(bufp, stat, dotu); |
| 307 | |
| 308 | if (buf_check_overflow(bufp)) |
| 309 | return 0; |
| 310 | else |
| 311 | return bufp->p - p; |
| 312 | } |
| 313 | EXPORT_SYMBOL(p9_deserialize_stat); |
| 314 | |
| 315 | /** |
| 316 | * deserialize_fcall - unmarshal a response |
| 317 | * @buf: recieved buffer |
| 318 | * @buflen: length of received buffer |
| 319 | * @rcall: fcall structure to populate |
| 320 | * @rcalllen: length of fcall structure to populate |
| 321 | * @dotu: non-zero if 9P2000.u |
| 322 | * |
| 323 | */ |
| 324 | |
| 325 | int |
| 326 | p9_deserialize_fcall(void *buf, u32 buflen, struct p9_fcall *rcall, |
| 327 | int dotu) |
| 328 | { |
| 329 | |
| 330 | struct cbuf buffer; |
| 331 | struct cbuf *bufp = &buffer; |
| 332 | int i = 0; |
| 333 | |
| 334 | buf_init(bufp, buf, buflen); |
| 335 | |
| 336 | rcall->size = buf_get_int32(bufp); |
| 337 | rcall->id = buf_get_int8(bufp); |
| 338 | rcall->tag = buf_get_int16(bufp); |
| 339 | |
| 340 | P9_DPRINTK(P9_DEBUG_CONV, "size %d id %d tag %d\n", rcall->size, |
| 341 | rcall->id, rcall->tag); |
| 342 | |
| 343 | switch (rcall->id) { |
| 344 | default: |
| 345 | P9_EPRINTK(KERN_ERR, "unknown message type: %d\n", rcall->id); |
| 346 | return -EPROTO; |
| 347 | case P9_RVERSION: |
| 348 | rcall->params.rversion.msize = buf_get_int32(bufp); |
| 349 | buf_get_str(bufp, &rcall->params.rversion.version); |
| 350 | break; |
| 351 | case P9_RFLUSH: |
| 352 | break; |
| 353 | case P9_RATTACH: |
| 354 | rcall->params.rattach.qid.type = buf_get_int8(bufp); |
| 355 | rcall->params.rattach.qid.version = buf_get_int32(bufp); |
| 356 | rcall->params.rattach.qid.path = buf_get_int64(bufp); |
| 357 | break; |
| 358 | case P9_RWALK: |
| 359 | rcall->params.rwalk.nwqid = buf_get_int16(bufp); |
| 360 | if (rcall->params.rwalk.nwqid > P9_MAXWELEM) { |
| 361 | P9_EPRINTK(KERN_ERR, |
| 362 | "Rwalk with more than %d qids: %d\n", |
| 363 | P9_MAXWELEM, rcall->params.rwalk.nwqid); |
| 364 | return -EPROTO; |
| 365 | } |
| 366 | |
| 367 | for (i = 0; i < rcall->params.rwalk.nwqid; i++) |
| 368 | buf_get_qid(bufp, &rcall->params.rwalk.wqids[i]); |
| 369 | break; |
| 370 | case P9_ROPEN: |
| 371 | buf_get_qid(bufp, &rcall->params.ropen.qid); |
| 372 | rcall->params.ropen.iounit = buf_get_int32(bufp); |
| 373 | break; |
| 374 | case P9_RCREATE: |
| 375 | buf_get_qid(bufp, &rcall->params.rcreate.qid); |
| 376 | rcall->params.rcreate.iounit = buf_get_int32(bufp); |
| 377 | break; |
| 378 | case P9_RREAD: |
| 379 | rcall->params.rread.count = buf_get_int32(bufp); |
| 380 | rcall->params.rread.data = bufp->p; |
| 381 | buf_check_size(bufp, rcall->params.rread.count); |
| 382 | break; |
| 383 | case P9_RWRITE: |
| 384 | rcall->params.rwrite.count = buf_get_int32(bufp); |
| 385 | break; |
| 386 | case P9_RCLUNK: |
| 387 | break; |
| 388 | case P9_RREMOVE: |
| 389 | break; |
| 390 | case P9_RSTAT: |
| 391 | buf_get_int16(bufp); |
| 392 | buf_get_stat(bufp, &rcall->params.rstat.stat, dotu); |
| 393 | break; |
| 394 | case P9_RWSTAT: |
| 395 | break; |
| 396 | case P9_RERROR: |
| 397 | buf_get_str(bufp, &rcall->params.rerror.error); |
| 398 | if (dotu) |
| 399 | rcall->params.rerror.errno = buf_get_int16(bufp); |
| 400 | break; |
| 401 | } |
| 402 | |
| 403 | if (buf_check_overflow(bufp)) { |
| 404 | P9_DPRINTK(P9_DEBUG_ERROR, "buffer overflow\n"); |
| 405 | return -EIO; |
| 406 | } |
| 407 | |
| 408 | return bufp->p - bufp->sp; |
| 409 | } |
| 410 | EXPORT_SYMBOL(p9_deserialize_fcall); |
| 411 | |
| 412 | static inline void p9_put_int8(struct cbuf *bufp, u8 val, u8 * p) |
| 413 | { |
| 414 | *p = val; |
| 415 | buf_put_int8(bufp, val); |
| 416 | } |
| 417 | |
| 418 | static inline void p9_put_int16(struct cbuf *bufp, u16 val, u16 * p) |
| 419 | { |
| 420 | *p = val; |
| 421 | buf_put_int16(bufp, val); |
| 422 | } |
| 423 | |
| 424 | static inline void p9_put_int32(struct cbuf *bufp, u32 val, u32 * p) |
| 425 | { |
| 426 | *p = val; |
| 427 | buf_put_int32(bufp, val); |
| 428 | } |
| 429 | |
| 430 | static inline void p9_put_int64(struct cbuf *bufp, u64 val, u64 * p) |
| 431 | { |
| 432 | *p = val; |
| 433 | buf_put_int64(bufp, val); |
| 434 | } |
| 435 | |
| 436 | static void |
| 437 | p9_put_str(struct cbuf *bufp, char *data, struct p9_str *str) |
| 438 | { |
| 439 | int len; |
| 440 | char *s; |
| 441 | |
| 442 | if (data) |
| 443 | len = strlen(data); |
| 444 | else |
| 445 | len = 0; |
| 446 | |
| 447 | s = buf_put_stringn(bufp, data, len); |
| 448 | if (str) { |
| 449 | str->len = len; |
| 450 | str->str = s; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | static int |
| 455 | p9_put_data(struct cbuf *bufp, const char *data, int count, |
| 456 | unsigned char **pdata) |
| 457 | { |
| 458 | *pdata = buf_alloc(bufp, count); |
| 459 | memmove(*pdata, data, count); |
| 460 | return count; |
| 461 | } |
| 462 | |
| 463 | static int |
| 464 | p9_put_user_data(struct cbuf *bufp, const char __user *data, int count, |
| 465 | unsigned char **pdata) |
| 466 | { |
| 467 | *pdata = buf_alloc(bufp, count); |
| 468 | return copy_from_user(*pdata, data, count); |
| 469 | } |
| 470 | |
| 471 | static void |
| 472 | p9_put_wstat(struct cbuf *bufp, struct p9_wstat *wstat, |
| 473 | struct p9_stat *stat, int statsz, int dotu) |
| 474 | { |
| 475 | p9_put_int16(bufp, statsz, &stat->size); |
| 476 | p9_put_int16(bufp, wstat->type, &stat->type); |
| 477 | p9_put_int32(bufp, wstat->dev, &stat->dev); |
| 478 | p9_put_int8(bufp, wstat->qid.type, &stat->qid.type); |
| 479 | p9_put_int32(bufp, wstat->qid.version, &stat->qid.version); |
| 480 | p9_put_int64(bufp, wstat->qid.path, &stat->qid.path); |
| 481 | p9_put_int32(bufp, wstat->mode, &stat->mode); |
| 482 | p9_put_int32(bufp, wstat->atime, &stat->atime); |
| 483 | p9_put_int32(bufp, wstat->mtime, &stat->mtime); |
| 484 | p9_put_int64(bufp, wstat->length, &stat->length); |
| 485 | |
| 486 | p9_put_str(bufp, wstat->name, &stat->name); |
| 487 | p9_put_str(bufp, wstat->uid, &stat->uid); |
| 488 | p9_put_str(bufp, wstat->gid, &stat->gid); |
| 489 | p9_put_str(bufp, wstat->muid, &stat->muid); |
| 490 | |
| 491 | if (dotu) { |
| 492 | p9_put_str(bufp, wstat->extension, &stat->extension); |
| 493 | p9_put_int32(bufp, wstat->n_uid, &stat->n_uid); |
| 494 | p9_put_int32(bufp, wstat->n_gid, &stat->n_gid); |
| 495 | p9_put_int32(bufp, wstat->n_muid, &stat->n_muid); |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | static struct p9_fcall * |
| 500 | p9_create_common(struct cbuf *bufp, u32 size, u8 id) |
| 501 | { |
| 502 | struct p9_fcall *fc; |
| 503 | |
| 504 | size += 4 + 1 + 2; /* size[4] id[1] tag[2] */ |
| 505 | fc = kmalloc(sizeof(struct p9_fcall) + size, GFP_KERNEL); |
| 506 | if (!fc) |
| 507 | return ERR_PTR(-ENOMEM); |
| 508 | |
| 509 | fc->sdata = (char *)fc + sizeof(*fc); |
| 510 | |
| 511 | buf_init(bufp, (char *)fc->sdata, size); |
| 512 | p9_put_int32(bufp, size, &fc->size); |
| 513 | p9_put_int8(bufp, id, &fc->id); |
| 514 | p9_put_int16(bufp, P9_NOTAG, &fc->tag); |
| 515 | |
| 516 | return fc; |
| 517 | } |
| 518 | |
| 519 | void p9_set_tag(struct p9_fcall *fc, u16 tag) |
| 520 | { |
| 521 | fc->tag = tag; |
| 522 | *(__le16 *) (fc->sdata + 5) = cpu_to_le16(tag); |
| 523 | } |
| 524 | EXPORT_SYMBOL(p9_set_tag); |
| 525 | |
| 526 | struct p9_fcall *p9_create_tversion(u32 msize, char *version) |
| 527 | { |
| 528 | int size; |
| 529 | struct p9_fcall *fc; |
| 530 | struct cbuf buffer; |
| 531 | struct cbuf *bufp = &buffer; |
| 532 | |
| 533 | size = 4 + 2 + strlen(version); /* msize[4] version[s] */ |
| 534 | fc = p9_create_common(bufp, size, P9_TVERSION); |
| 535 | if (IS_ERR(fc)) |
| 536 | goto error; |
| 537 | |
| 538 | p9_put_int32(bufp, msize, &fc->params.tversion.msize); |
| 539 | p9_put_str(bufp, version, &fc->params.tversion.version); |
| 540 | |
| 541 | if (buf_check_overflow(bufp)) { |
| 542 | kfree(fc); |
| 543 | fc = ERR_PTR(-ENOMEM); |
| 544 | } |
| 545 | error: |
| 546 | return fc; |
| 547 | } |
| 548 | EXPORT_SYMBOL(p9_create_tversion); |
| 549 | |
| 550 | struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname) |
| 551 | { |
| 552 | int size; |
| 553 | struct p9_fcall *fc; |
| 554 | struct cbuf buffer; |
| 555 | struct cbuf *bufp = &buffer; |
| 556 | |
| 557 | /* afid[4] uname[s] aname[s] */ |
| 558 | size = 4 + 2 + strlen(uname) + 2 + strlen(aname); |
| 559 | fc = p9_create_common(bufp, size, P9_TAUTH); |
| 560 | if (IS_ERR(fc)) |
| 561 | goto error; |
| 562 | |
| 563 | p9_put_int32(bufp, afid, &fc->params.tauth.afid); |
| 564 | p9_put_str(bufp, uname, &fc->params.tauth.uname); |
| 565 | p9_put_str(bufp, aname, &fc->params.tauth.aname); |
| 566 | |
| 567 | if (buf_check_overflow(bufp)) { |
| 568 | kfree(fc); |
| 569 | fc = ERR_PTR(-ENOMEM); |
| 570 | } |
| 571 | error: |
| 572 | return fc; |
| 573 | } |
| 574 | EXPORT_SYMBOL(p9_create_tauth); |
| 575 | |
| 576 | struct p9_fcall * |
| 577 | p9_create_tattach(u32 fid, u32 afid, char *uname, char *aname) |
| 578 | { |
| 579 | int size; |
| 580 | struct p9_fcall *fc; |
| 581 | struct cbuf buffer; |
| 582 | struct cbuf *bufp = &buffer; |
| 583 | |
| 584 | /* fid[4] afid[4] uname[s] aname[s] */ |
| 585 | size = 4 + 4 + 2 + strlen(uname) + 2 + strlen(aname); |
| 586 | fc = p9_create_common(bufp, size, P9_TATTACH); |
| 587 | if (IS_ERR(fc)) |
| 588 | goto error; |
| 589 | |
| 590 | p9_put_int32(bufp, fid, &fc->params.tattach.fid); |
| 591 | p9_put_int32(bufp, afid, &fc->params.tattach.afid); |
| 592 | p9_put_str(bufp, uname, &fc->params.tattach.uname); |
| 593 | p9_put_str(bufp, aname, &fc->params.tattach.aname); |
| 594 | |
| 595 | error: |
| 596 | return fc; |
| 597 | } |
| 598 | EXPORT_SYMBOL(p9_create_tattach); |
| 599 | |
| 600 | struct p9_fcall *p9_create_tflush(u16 oldtag) |
| 601 | { |
| 602 | int size; |
| 603 | struct p9_fcall *fc; |
| 604 | struct cbuf buffer; |
| 605 | struct cbuf *bufp = &buffer; |
| 606 | |
| 607 | size = 2; /* oldtag[2] */ |
| 608 | fc = p9_create_common(bufp, size, P9_TFLUSH); |
| 609 | if (IS_ERR(fc)) |
| 610 | goto error; |
| 611 | |
| 612 | p9_put_int16(bufp, oldtag, &fc->params.tflush.oldtag); |
| 613 | |
| 614 | if (buf_check_overflow(bufp)) { |
| 615 | kfree(fc); |
| 616 | fc = ERR_PTR(-ENOMEM); |
| 617 | } |
| 618 | error: |
| 619 | return fc; |
| 620 | } |
| 621 | EXPORT_SYMBOL(p9_create_tflush); |
| 622 | |
| 623 | struct p9_fcall *p9_create_twalk(u32 fid, u32 newfid, u16 nwname, |
| 624 | char **wnames) |
| 625 | { |
| 626 | int i, size; |
| 627 | struct p9_fcall *fc; |
| 628 | struct cbuf buffer; |
| 629 | struct cbuf *bufp = &buffer; |
| 630 | |
| 631 | if (nwname > P9_MAXWELEM) { |
| 632 | P9_DPRINTK(P9_DEBUG_ERROR, "nwname > %d\n", P9_MAXWELEM); |
| 633 | return NULL; |
| 634 | } |
| 635 | |
| 636 | size = 4 + 4 + 2; /* fid[4] newfid[4] nwname[2] ... */ |
| 637 | for (i = 0; i < nwname; i++) { |
| 638 | size += 2 + strlen(wnames[i]); /* wname[s] */ |
| 639 | } |
| 640 | |
| 641 | fc = p9_create_common(bufp, size, P9_TWALK); |
| 642 | if (IS_ERR(fc)) |
| 643 | goto error; |
| 644 | |
| 645 | p9_put_int32(bufp, fid, &fc->params.twalk.fid); |
| 646 | p9_put_int32(bufp, newfid, &fc->params.twalk.newfid); |
| 647 | p9_put_int16(bufp, nwname, &fc->params.twalk.nwname); |
| 648 | for (i = 0; i < nwname; i++) { |
| 649 | p9_put_str(bufp, wnames[i], &fc->params.twalk.wnames[i]); |
| 650 | } |
| 651 | |
| 652 | if (buf_check_overflow(bufp)) { |
| 653 | kfree(fc); |
| 654 | fc = ERR_PTR(-ENOMEM); |
| 655 | } |
| 656 | error: |
| 657 | return fc; |
| 658 | } |
| 659 | EXPORT_SYMBOL(p9_create_twalk); |
| 660 | |
| 661 | struct p9_fcall *p9_create_topen(u32 fid, u8 mode) |
| 662 | { |
| 663 | int size; |
| 664 | struct p9_fcall *fc; |
| 665 | struct cbuf buffer; |
| 666 | struct cbuf *bufp = &buffer; |
| 667 | |
| 668 | size = 4 + 1; /* fid[4] mode[1] */ |
| 669 | fc = p9_create_common(bufp, size, P9_TOPEN); |
| 670 | if (IS_ERR(fc)) |
| 671 | goto error; |
| 672 | |
| 673 | p9_put_int32(bufp, fid, &fc->params.topen.fid); |
| 674 | p9_put_int8(bufp, mode, &fc->params.topen.mode); |
| 675 | |
| 676 | if (buf_check_overflow(bufp)) { |
| 677 | kfree(fc); |
| 678 | fc = ERR_PTR(-ENOMEM); |
| 679 | } |
| 680 | error: |
| 681 | return fc; |
| 682 | } |
| 683 | EXPORT_SYMBOL(p9_create_topen); |
| 684 | |
| 685 | struct p9_fcall *p9_create_tcreate(u32 fid, char *name, u32 perm, u8 mode, |
| 686 | char *extension, int dotu) |
| 687 | { |
| 688 | int size; |
| 689 | struct p9_fcall *fc; |
| 690 | struct cbuf buffer; |
| 691 | struct cbuf *bufp = &buffer; |
| 692 | |
| 693 | /* fid[4] name[s] perm[4] mode[1] */ |
| 694 | size = 4 + 2 + strlen(name) + 4 + 1; |
| 695 | if (dotu) { |
| 696 | size += 2 + /* extension[s] */ |
| 697 | (extension == NULL ? 0 : strlen(extension)); |
| 698 | } |
| 699 | |
| 700 | fc = p9_create_common(bufp, size, P9_TCREATE); |
| 701 | if (IS_ERR(fc)) |
| 702 | goto error; |
| 703 | |
| 704 | p9_put_int32(bufp, fid, &fc->params.tcreate.fid); |
| 705 | p9_put_str(bufp, name, &fc->params.tcreate.name); |
| 706 | p9_put_int32(bufp, perm, &fc->params.tcreate.perm); |
| 707 | p9_put_int8(bufp, mode, &fc->params.tcreate.mode); |
| 708 | if (dotu) |
| 709 | p9_put_str(bufp, extension, &fc->params.tcreate.extension); |
| 710 | |
| 711 | if (buf_check_overflow(bufp)) { |
| 712 | kfree(fc); |
| 713 | fc = ERR_PTR(-ENOMEM); |
| 714 | } |
| 715 | error: |
| 716 | return fc; |
| 717 | } |
| 718 | EXPORT_SYMBOL(p9_create_tcreate); |
| 719 | |
| 720 | struct p9_fcall *p9_create_tread(u32 fid, u64 offset, u32 count) |
| 721 | { |
| 722 | int size; |
| 723 | struct p9_fcall *fc; |
| 724 | struct cbuf buffer; |
| 725 | struct cbuf *bufp = &buffer; |
| 726 | |
| 727 | size = 4 + 8 + 4; /* fid[4] offset[8] count[4] */ |
| 728 | fc = p9_create_common(bufp, size, P9_TREAD); |
| 729 | if (IS_ERR(fc)) |
| 730 | goto error; |
| 731 | |
| 732 | p9_put_int32(bufp, fid, &fc->params.tread.fid); |
| 733 | p9_put_int64(bufp, offset, &fc->params.tread.offset); |
| 734 | p9_put_int32(bufp, count, &fc->params.tread.count); |
| 735 | |
| 736 | if (buf_check_overflow(bufp)) { |
| 737 | kfree(fc); |
| 738 | fc = ERR_PTR(-ENOMEM); |
| 739 | } |
| 740 | error: |
| 741 | return fc; |
| 742 | } |
| 743 | EXPORT_SYMBOL(p9_create_tread); |
| 744 | |
| 745 | struct p9_fcall *p9_create_twrite(u32 fid, u64 offset, u32 count, |
| 746 | const char *data) |
| 747 | { |
| 748 | int size, err; |
| 749 | struct p9_fcall *fc; |
| 750 | struct cbuf buffer; |
| 751 | struct cbuf *bufp = &buffer; |
| 752 | |
| 753 | /* fid[4] offset[8] count[4] data[count] */ |
| 754 | size = 4 + 8 + 4 + count; |
| 755 | fc = p9_create_common(bufp, size, P9_TWRITE); |
| 756 | if (IS_ERR(fc)) |
| 757 | goto error; |
| 758 | |
| 759 | p9_put_int32(bufp, fid, &fc->params.twrite.fid); |
| 760 | p9_put_int64(bufp, offset, &fc->params.twrite.offset); |
| 761 | p9_put_int32(bufp, count, &fc->params.twrite.count); |
| 762 | err = p9_put_data(bufp, data, count, &fc->params.twrite.data); |
| 763 | if (err) { |
| 764 | kfree(fc); |
| 765 | fc = ERR_PTR(err); |
Mariusz Kozlowski | bbe06f6 | 2007-07-31 00:39:13 -0700 | [diff] [blame] | 766 | goto error; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | if (buf_check_overflow(bufp)) { |
| 770 | kfree(fc); |
| 771 | fc = ERR_PTR(-ENOMEM); |
| 772 | } |
| 773 | error: |
| 774 | return fc; |
| 775 | } |
| 776 | EXPORT_SYMBOL(p9_create_twrite); |
| 777 | |
| 778 | struct p9_fcall *p9_create_twrite_u(u32 fid, u64 offset, u32 count, |
| 779 | const char __user *data) |
| 780 | { |
| 781 | int size, err; |
| 782 | struct p9_fcall *fc; |
| 783 | struct cbuf buffer; |
| 784 | struct cbuf *bufp = &buffer; |
| 785 | |
| 786 | /* fid[4] offset[8] count[4] data[count] */ |
| 787 | size = 4 + 8 + 4 + count; |
| 788 | fc = p9_create_common(bufp, size, P9_TWRITE); |
| 789 | if (IS_ERR(fc)) |
| 790 | goto error; |
| 791 | |
| 792 | p9_put_int32(bufp, fid, &fc->params.twrite.fid); |
| 793 | p9_put_int64(bufp, offset, &fc->params.twrite.offset); |
| 794 | p9_put_int32(bufp, count, &fc->params.twrite.count); |
| 795 | err = p9_put_user_data(bufp, data, count, &fc->params.twrite.data); |
| 796 | if (err) { |
| 797 | kfree(fc); |
| 798 | fc = ERR_PTR(err); |
Mariusz Kozlowski | 02881d9 | 2007-08-23 10:24:28 -0500 | [diff] [blame^] | 799 | goto error; |
Latchesar Ionkov | bd238fb | 2007-07-10 17:57:28 -0500 | [diff] [blame] | 800 | } |
| 801 | |
| 802 | if (buf_check_overflow(bufp)) { |
| 803 | kfree(fc); |
| 804 | fc = ERR_PTR(-ENOMEM); |
| 805 | } |
| 806 | error: |
| 807 | return fc; |
| 808 | } |
| 809 | EXPORT_SYMBOL(p9_create_twrite_u); |
| 810 | |
| 811 | struct p9_fcall *p9_create_tclunk(u32 fid) |
| 812 | { |
| 813 | int size; |
| 814 | struct p9_fcall *fc; |
| 815 | struct cbuf buffer; |
| 816 | struct cbuf *bufp = &buffer; |
| 817 | |
| 818 | size = 4; /* fid[4] */ |
| 819 | fc = p9_create_common(bufp, size, P9_TCLUNK); |
| 820 | if (IS_ERR(fc)) |
| 821 | goto error; |
| 822 | |
| 823 | p9_put_int32(bufp, fid, &fc->params.tclunk.fid); |
| 824 | |
| 825 | if (buf_check_overflow(bufp)) { |
| 826 | kfree(fc); |
| 827 | fc = ERR_PTR(-ENOMEM); |
| 828 | } |
| 829 | error: |
| 830 | return fc; |
| 831 | } |
| 832 | EXPORT_SYMBOL(p9_create_tclunk); |
| 833 | |
| 834 | struct p9_fcall *p9_create_tremove(u32 fid) |
| 835 | { |
| 836 | int size; |
| 837 | struct p9_fcall *fc; |
| 838 | struct cbuf buffer; |
| 839 | struct cbuf *bufp = &buffer; |
| 840 | |
| 841 | size = 4; /* fid[4] */ |
| 842 | fc = p9_create_common(bufp, size, P9_TREMOVE); |
| 843 | if (IS_ERR(fc)) |
| 844 | goto error; |
| 845 | |
| 846 | p9_put_int32(bufp, fid, &fc->params.tremove.fid); |
| 847 | |
| 848 | if (buf_check_overflow(bufp)) { |
| 849 | kfree(fc); |
| 850 | fc = ERR_PTR(-ENOMEM); |
| 851 | } |
| 852 | error: |
| 853 | return fc; |
| 854 | } |
| 855 | EXPORT_SYMBOL(p9_create_tremove); |
| 856 | |
| 857 | struct p9_fcall *p9_create_tstat(u32 fid) |
| 858 | { |
| 859 | int size; |
| 860 | struct p9_fcall *fc; |
| 861 | struct cbuf buffer; |
| 862 | struct cbuf *bufp = &buffer; |
| 863 | |
| 864 | size = 4; /* fid[4] */ |
| 865 | fc = p9_create_common(bufp, size, P9_TSTAT); |
| 866 | if (IS_ERR(fc)) |
| 867 | goto error; |
| 868 | |
| 869 | p9_put_int32(bufp, fid, &fc->params.tstat.fid); |
| 870 | |
| 871 | if (buf_check_overflow(bufp)) { |
| 872 | kfree(fc); |
| 873 | fc = ERR_PTR(-ENOMEM); |
| 874 | } |
| 875 | error: |
| 876 | return fc; |
| 877 | } |
| 878 | EXPORT_SYMBOL(p9_create_tstat); |
| 879 | |
| 880 | struct p9_fcall *p9_create_twstat(u32 fid, struct p9_wstat *wstat, |
| 881 | int dotu) |
| 882 | { |
| 883 | int size, statsz; |
| 884 | struct p9_fcall *fc; |
| 885 | struct cbuf buffer; |
| 886 | struct cbuf *bufp = &buffer; |
| 887 | |
| 888 | statsz = p9_size_wstat(wstat, dotu); |
| 889 | size = 4 + 2 + 2 + statsz; /* fid[4] stat[n] */ |
| 890 | fc = p9_create_common(bufp, size, P9_TWSTAT); |
| 891 | if (IS_ERR(fc)) |
| 892 | goto error; |
| 893 | |
| 894 | p9_put_int32(bufp, fid, &fc->params.twstat.fid); |
| 895 | buf_put_int16(bufp, statsz + 2); |
| 896 | p9_put_wstat(bufp, wstat, &fc->params.twstat.stat, statsz, dotu); |
| 897 | |
| 898 | if (buf_check_overflow(bufp)) { |
| 899 | kfree(fc); |
| 900 | fc = ERR_PTR(-ENOMEM); |
| 901 | } |
| 902 | error: |
| 903 | return fc; |
| 904 | } |
| 905 | EXPORT_SYMBOL(p9_create_twstat); |