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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 | /* * linux/fs/nfs/proc.c * * Copyright (C) 1992 Rick Sladkey * * OS-independent nfs remote procedure call functions */ /* * Defining NFS_PROC_DEBUG causes a lookup of a file named * "xyzzy" to toggle debugging. Just cd to an NFS-mounted * filesystem and type 'ls xyzzy' to turn on debugging. */ #define NFS_PROC_DEBUG #include <linux/param.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/nfs_fs.h> #include <linux/utsname.h> #include <linux/errno.h> #include <linux/string.h> #include <netinet/in.h> #ifdef NFS_PROC_DEBUG static int proc_debug = 0; #define PRINTK if (proc_debug) printk #else #define PRINTK (void) #endif static int *nfs_rpc_header(int *p, int procedure); static int *nfs_rpc_verify(int *p); static int nfs_stat_to_errno(int stat); /* * Here are a bunch of xdr encode/decode functions that convert * between machine dependent and xdr data formats. */ static inline int *xdr_encode_fhandle(int *p, struct nfs_fh *fhandle) { *((struct nfs_fh *) p) = *fhandle; p += (sizeof (*fhandle) + 3) >> 2; return p; } static inline int *xdr_decode_fhandle(int *p, struct nfs_fh *fhandle) { *fhandle = *((struct nfs_fh *) p); p += (sizeof (*fhandle) + 3) >> 2; return p; } static inline int *xdr_encode_string(int *p, char *string) { int len, quadlen; len = strlen(string); quadlen = (len + 3) >> 2; *p++ = htonl(len); memcpy((char *) p, string, len); memset(((char *) p) + len, '\0', (quadlen << 2) - len); p += quadlen; return p; } static inline int *xdr_decode_string(int *p, char *string) { int len; len = ntohl(*p++); memcpy(string, (char *) p, len); string[len] = '\0'; p += (len + 3) >> 2; return p; } static inline int *xdr_encode_data(int *p, char *data, int len) { int quadlen; quadlen = (len + 3) >> 2; *p++ = htonl(len); memcpy((char *) p, data, len); memset(((char *) p) + len, '\0', (quadlen << 2) - len); p += quadlen; return p; } static inline int *xdr_decode_data(int *p, char *data, int *lenp) { int len; len = *lenp = ntohl(*p++); memcpy(data, (char *) p, len); data[len] = '\0'; p += (len + 3) >> 2; return p; } static int *xdr_decode_fattr(int *p, struct nfs_fattr *fattr) { fattr->type = ntohl(*p++); fattr->mode = ntohl(*p++); fattr->nlink = ntohl(*p++); fattr->uid = ntohl(*p++); fattr->gid = ntohl(*p++); fattr->size = ntohl(*p++); fattr->blocksize = ntohl(*p++); fattr->rdev = ntohl(*p++); fattr->blocks = ntohl(*p++); fattr->fsid = ntohl(*p++); fattr->fileid = ntohl(*p++); fattr->atime.seconds = ntohl(*p++); fattr->atime.useconds = ntohl(*p++); fattr->mtime.seconds = ntohl(*p++); fattr->mtime.useconds = ntohl(*p++); fattr->ctime.seconds = ntohl(*p++); fattr->ctime.useconds = ntohl(*p++); return p; } static int *xdr_encode_sattr(int *p, struct nfs_sattr *sattr) { *p++ = htonl(sattr->mode); *p++ = htonl(sattr->uid); *p++ = htonl(sattr->gid); *p++ = htonl(sattr->size); *p++ = htonl(sattr->atime.seconds); *p++ = htonl(sattr->atime.useconds); *p++ = htonl(sattr->mtime.seconds); *p++ = htonl(sattr->mtime.useconds); return p; } static int *xdr_decode_entry(int *p, struct nfs_entry *entry) { entry->fileid = ntohl(*p++); p = xdr_decode_string(p, entry->name); entry->cookie = ntohl(*p++); entry->eof = 0; return p; } static int *xdr_decode_fsinfo(int *p, struct nfs_fsinfo *res) { res->tsize = ntohl(*p++); res->bsize = ntohl(*p++); res->blocks = ntohl(*p++); res->bfree = ntohl(*p++); res->bavail = ntohl(*p++); return p; } int nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) { int *p, *p0; int status; PRINTK("NFS call getattr\n"); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_GETATTR); p = xdr_encode_fhandle(p, fhandle); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_fattr(p, fattr); PRINTK("NFS reply getattr\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_setattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_sattr *sattr, struct nfs_fattr *fattr) { int *p, *p0; int status; PRINTK("NFS call setattr\n"); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_SETATTR); p = xdr_encode_fhandle(p, fhandle); p = xdr_encode_sattr(p, sattr); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_fattr(p, fattr); PRINTK("NFS reply setattr\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_lookup(struct nfs_server *server, struct nfs_fh *dir, char *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr) { int *p, *p0; int status; PRINTK("NFS call lookup %s\n", name); #ifdef NFS_PROC_DEBUG if (!strcmp(name, "xyzzy")) proc_debug = 1 - proc_debug; #endif p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_LOOKUP); p = xdr_encode_fhandle(p, dir); p = xdr_encode_string(p, name); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_fhandle(p, fhandle); p = xdr_decode_fattr(p, fattr); PRINTK("NFS reply lookup\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_readlink(struct nfs_server *server, struct nfs_fh *fhandle, char *res) { int *p, *p0; int status; PRINTK("NFS call readlink\n"); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_READLINK); p = xdr_encode_fhandle(p, fhandle); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_string(p, res); PRINTK("NFS reply readlink %s\n", res); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_read(struct nfs_server *server, struct nfs_fh *fhandle, int offset, int count, char *data, struct nfs_fattr *fattr) { int *p, *p0; int status; int len = 0; /* = 0 is for gcc */ PRINTK("NFS call read %d @ %d\n", count, offset); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_READ); p = xdr_encode_fhandle(p, fhandle); *p++ = htonl(offset); *p++ = htonl(count); *p++ = htonl(count); /* traditional, could be any value */ if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_fattr(p, fattr); p = xdr_decode_data(p, data, &len); PRINTK("NFS reply read %d\n", len); } free_page((long) p0); return (status == NFS_OK) ? len : -nfs_stat_to_errno(status); } int nfs_proc_write(struct nfs_server *server, struct nfs_fh *fhandle, int offset, int count, char *data, struct nfs_fattr *fattr) { int *p, *p0; int status; PRINTK("NFS call write %d @ %d\n", count, offset); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_WRITE); p = xdr_encode_fhandle(p, fhandle); *p++ = htonl(offset); /* traditional, could be any value */ *p++ = htonl(offset); *p++ = htonl(count); /* traditional, could be any value */ p = xdr_encode_data(p, data, count); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_fattr(p, fattr); PRINTK("NFS reply write\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_create(struct nfs_server *server, struct nfs_fh *dir, char *name, struct nfs_sattr *sattr, struct nfs_fh *fhandle, struct nfs_fattr *fattr) { int *p, *p0; int status; PRINTK("NFS call create %s\n", name); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_CREATE); p = xdr_encode_fhandle(p, dir); p = xdr_encode_string(p, name); p = xdr_encode_sattr(p, sattr); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_fhandle(p, fhandle); p = xdr_decode_fattr(p, fattr); PRINTK("NFS reply create\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_remove(struct nfs_server *server, struct nfs_fh *dir, char *name) { int *p, *p0; int status; PRINTK("NFS call remove %s\n", name); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_REMOVE); p = xdr_encode_fhandle(p, dir); p = xdr_encode_string(p, name); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { PRINTK("NFS reply remove\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_rename(struct nfs_server *server, struct nfs_fh *old_dir, char *old_name, struct nfs_fh *new_dir, char *new_name) { int *p, *p0; int status; PRINTK("NFS call rename %s -> %s\n", old_name, new_name); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_RENAME); p = xdr_encode_fhandle(p, old_dir); p = xdr_encode_string(p, old_name); p = xdr_encode_fhandle(p, new_dir); p = xdr_encode_string(p, new_name); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { PRINTK("NFS reply rename\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_link(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fh *dir, char *name) { int *p, *p0; int status; PRINTK("NFS call link %s\n", name); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_LINK); p = xdr_encode_fhandle(p, fhandle); p = xdr_encode_fhandle(p, dir); p = xdr_encode_string(p, name); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { PRINTK("NFS reply link\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_symlink(struct nfs_server *server, struct nfs_fh *dir, char *name, char *path, struct nfs_sattr *sattr) { int *p, *p0; int status; PRINTK("NFS call symlink %s -> %s\n", name, path); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_SYMLINK); p = xdr_encode_fhandle(p, dir); p = xdr_encode_string(p, name); p = xdr_encode_string(p, path); p = xdr_encode_sattr(p, sattr); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { PRINTK("NFS reply symlink\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_mkdir(struct nfs_server *server, struct nfs_fh *dir, char *name, struct nfs_sattr *sattr, struct nfs_fh *fhandle, struct nfs_fattr *fattr) { int *p, *p0; int status; PRINTK("NFS call mkdir %s\n", name); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_MKDIR); p = xdr_encode_fhandle(p, dir); p = xdr_encode_string(p, name); p = xdr_encode_sattr(p, sattr); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_fhandle(p, fhandle); p = xdr_decode_fattr(p, fattr); PRINTK("NFS reply mkdir\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_rmdir(struct nfs_server *server, struct nfs_fh *dir, char *name) { int *p, *p0; int status; PRINTK("NFS call rmdir %s\n", name); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_RMDIR); p = xdr_encode_fhandle(p, dir); p = xdr_encode_string(p, name); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { PRINTK("NFS reply rmdir\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } int nfs_proc_readdir(struct nfs_server *server, struct nfs_fh *fhandle, int cookie, int count, struct nfs_entry *entry) { int *p, *p0; int status; int i = 0; /* = 0 is for gcc */ int size; int eof; PRINTK("NFS call readdir %d @ %d\n", count, cookie); size = server->rsize; p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_READDIR); p = xdr_encode_fhandle(p, fhandle); *p++ = htonl(cookie); *p++ = htonl(size); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { for (i = 0; i < count && *p++; i++) p = xdr_decode_entry(p, entry++); eof = (i == count && !*p++ && *p++) || (i < count && *p++); if (eof && i) entry[-1].eof = 1; PRINTK("NFS reply readdir %d %s\n", i, eof ? "eof" : ""); } free_page((long) p0); return (status == NFS_OK) ? i : -nfs_stat_to_errno(status); } int nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *res) { int *p, *p0; int status; PRINTK("NFS call statfs\n"); p = p0 = (int *) get_free_page(GFP_KERNEL); p = nfs_rpc_header(p, NFSPROC_STATFS); p = xdr_encode_fhandle(p, fhandle); if ((status = nfs_rpc_call(server, p0, p)) < 0) { free_page((long) p0); return status; } if (!(p = nfs_rpc_verify(p0))) status = NFSERR_IO; else if ((status = ntohl(*p++)) == NFS_OK) { p = xdr_decode_fsinfo(p, res); PRINTK("NFS reply statfs\n"); } free_page((long) p0); return -nfs_stat_to_errno(status); } /* * Here are a few RPC-assist functions. */ static int *nfs_rpc_header(int *p, int procedure) { int *p1, *p2; int i; static int xid = 0; unsigned char *sys = system_utsname.nodename; if (xid == 0) { xid = CURRENT_TIME; xid ^= (sys[3]<<24) | (sys[2]<<16) | (sys[1]<<8) | sys[0]; } *p++ = htonl(++xid); *p++ = htonl(RPC_CALL); *p++ = htonl(RPC_VERSION); *p++ = htonl(NFS_PROGRAM); *p++ = htonl(NFS_VERSION); *p++ = htonl(procedure); *p++ = htonl(RPC_AUTH_UNIX); p1 = p++; *p++ = htonl(CURRENT_TIME); /* traditional, could be anything */ p = xdr_encode_string(p, sys); *p++ = htonl(current->euid); *p++ = htonl(current->egid); p2 = p++; for (i = 0; i < 16 && i < NGROUPS && current->groups[i] != NOGROUP; i++) *p++ = htonl(current->groups[i]); *p2 = htonl(i); *p1 = htonl((p - (p1 + 1)) << 2); *p++ = htonl(RPC_AUTH_NULL); *p++ = htonl(0); return p; } static int *nfs_rpc_verify(int *p) { int n; p++; if (ntohl(*p++) != RPC_REPLY) { printk("not an RPC reply\n"); return 0; } if (ntohl(*p++) != RPC_MSG_ACCEPTED) { printk("RPC call rejected\n"); return 0; } if ((n = ntohl(*p++)) != RPC_AUTH_NULL && n != RPC_AUTH_UNIX) { printk("reply with unknown RPC authentication type\n"); return 0; } n = ntohl(*p++); p += (n + 3) >> 2; if (ntohl(*p++) != RPC_SUCCESS) { printk("RPC call failed\n"); return 0; } return p; } /* * We need to translate between nfs status return values and * the local errno values which may not be the same. */ #ifndef EDQUOT #define EDQUOT ENOSPC #endif static struct { enum nfs_stat stat; int errno; } nfs_errtbl[] = { { NFS_OK, 0 }, { NFSERR_PERM, EPERM }, { NFSERR_NOENT, ENOENT }, { NFSERR_IO, EIO }, { NFSERR_NXIO, ENXIO }, { NFSERR_ACCES, EACCES }, { NFSERR_EXIST, EEXIST }, { NFSERR_NODEV, ENODEV }, { NFSERR_NOTDIR, ENOTDIR }, { NFSERR_ISDIR, EISDIR }, { NFSERR_FBIG, EFBIG }, { NFSERR_NOSPC, ENOSPC }, { NFSERR_ROFS, EROFS }, { NFSERR_NAMETOOLONG, ENAMETOOLONG }, { NFSERR_NOTEMPTY, ENOTEMPTY }, { NFSERR_DQUOT, EDQUOT }, { NFSERR_STALE, ESTALE }, { NFSERR_WFLUSH, EIO }, { -1, EIO } }; static int nfs_stat_to_errno(int stat) { int errno; int i; errno = EIO; for (i = 0; nfs_errtbl[i].stat != -1; i++) { if (nfs_errtbl[i].stat == stat) { errno = nfs_errtbl[i].errno; break; } } return errno; } |