ncplib_kernel.c 32.5 KB
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
/*
 *  ncplib_kernel.c
 *
 *  Copyright (C) 1995, 1996 by Volker Lendecke
 *  Modified for big endian by J.F. Chadima and David S. Miller
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *  Modified 1999 Wolfram Pienkoss for NLS
 *  Modified 2000 Ben Harris, University of Cambridge for NFS NS meta-info
 *
 */



#include "ncp_fs.h"

static inline void assert_server_locked(struct ncp_server *server)
{
	if (server->lock == 0) {
		DPRINTK("ncpfs: server not locked!\n");
	}
}

static void ncp_add_byte(struct ncp_server *server, __u8 x)
{
	assert_server_locked(server);
	*(__u8 *) (&(server->packet[server->current_size])) = x;
	server->current_size += 1;
	return;
}

static void ncp_add_word(struct ncp_server *server, __le16 x)
{
	assert_server_locked(server);
	put_unaligned(x, (__le16 *) (&(server->packet[server->current_size])));
	server->current_size += 2;
	return;
}

static void ncp_add_be16(struct ncp_server *server, __u16 x)
{
	assert_server_locked(server);
	put_unaligned(cpu_to_be16(x), (__be16 *) (&(server->packet[server->current_size])));
	server->current_size += 2;
}

static void ncp_add_dword(struct ncp_server *server, __le32 x)
{
	assert_server_locked(server);
	put_unaligned(x, (__le32 *) (&(server->packet[server->current_size])));
	server->current_size += 4;
	return;
}

static void ncp_add_be32(struct ncp_server *server, __u32 x)
{
	assert_server_locked(server);
	put_unaligned(cpu_to_be32(x), (__be32 *)(&(server->packet[server->current_size])));
	server->current_size += 4;
}

static inline void ncp_add_dword_lh(struct ncp_server *server, __u32 x) {
	ncp_add_dword(server, cpu_to_le32(x));
}

static void ncp_add_mem(struct ncp_server *server, const void *source, int size)
{
	assert_server_locked(server);
	memcpy(&(server->packet[server->current_size]), source, size);
	server->current_size += size;
	return;
}

static void ncp_add_pstring(struct ncp_server *server, const char *s)
{
	int len = strlen(s);
	assert_server_locked(server);
	if (len > 255) {
		DPRINTK("ncpfs: string too long: %s\n", s);
		len = 255;
	}
	ncp_add_byte(server, len);
	ncp_add_mem(server, s, len);
	return;
}

static inline void ncp_init_request(struct ncp_server *server)
{
	ncp_lock_server(server);

	server->current_size = sizeof(struct ncp_request_header);
	server->has_subfunction = 0;
}

static inline void ncp_init_request_s(struct ncp_server *server, int subfunction)
{
	ncp_lock_server(server);
	
	server->current_size = sizeof(struct ncp_request_header) + 2;
	ncp_add_byte(server, subfunction);

	server->has_subfunction = 1;
}

static inline char *
ncp_reply_data(struct ncp_server *server, int offset)
{
	return &(server->packet[sizeof(struct ncp_reply_header) + offset]);
}

static inline u8 BVAL(const void *data)
{
	return *(const u8 *)data;
}

static u8 ncp_reply_byte(struct ncp_server *server, int offset)
{
	return *(const u8 *)ncp_reply_data(server, offset);
}

static inline u16 WVAL_LH(const void *data)
{
	return get_unaligned_le16(data);
}

static u16
ncp_reply_le16(struct ncp_server *server, int offset)
{
	return get_unaligned_le16(ncp_reply_data(server, offset));
}

static u16
ncp_reply_be16(struct ncp_server *server, int offset)
{
	return get_unaligned_be16(ncp_reply_data(server, offset));
}

static inline u32 DVAL_LH(const void *data)
{
	return get_unaligned_le32(data);
}

static __le32
ncp_reply_dword(struct ncp_server *server, int offset)
{
	return get_unaligned((__le32 *)ncp_reply_data(server, offset));
}

static inline __u32 ncp_reply_dword_lh(struct ncp_server* server, int offset) {
	return le32_to_cpu(ncp_reply_dword(server, offset));
}

int
ncp_negotiate_buffersize(struct ncp_server *server, int size, int *target)
{
	int result;

	ncp_init_request(server);
	ncp_add_be16(server, size);

	if ((result = ncp_request(server, 33)) != 0) {
		ncp_unlock_server(server);
		return result;
	}
	*target = min_t(unsigned int, ncp_reply_be16(server, 0), size);

	ncp_unlock_server(server);
	return 0;
}


/* options: 
 *	bit 0	ipx checksum
 *	bit 1	packet signing
 */
int
ncp_negotiate_size_and_options(struct ncp_server *server, 
	int size, int options, int *ret_size, int *ret_options) {
	int result;

	/* there is minimum */
	if (size < NCP_BLOCK_SIZE) size = NCP_BLOCK_SIZE;

	ncp_init_request(server);
	ncp_add_be16(server, size);
	ncp_add_byte(server, options);
	
	if ((result = ncp_request(server, 0x61)) != 0)
	{
		ncp_unlock_server(server);
		return result;
	}

	/* NCP over UDP returns 0 (!!!) */
	result = ncp_reply_be16(server, 0);
	if (result >= NCP_BLOCK_SIZE)
		size = min(result, size);
	*ret_size = size;
	*ret_options = ncp_reply_byte(server, 4);

	ncp_unlock_server(server);
	return 0;
}

int ncp_get_volume_info_with_number(struct ncp_server* server,
			     int n, struct ncp_volume_info* target) {
	int result;
	int len;

	ncp_init_request_s(server, 44);
	ncp_add_byte(server, n);

	if ((result = ncp_request(server, 22)) != 0) {
		goto out;
	}
	target->total_blocks = ncp_reply_dword_lh(server, 0);
	target->free_blocks = ncp_reply_dword_lh(server, 4);
	target->purgeable_blocks = ncp_reply_dword_lh(server, 8);
	target->not_yet_purgeable_blocks = ncp_reply_dword_lh(server, 12);
	target->total_dir_entries = ncp_reply_dword_lh(server, 16);
	target->available_dir_entries = ncp_reply_dword_lh(server, 20);
	target->sectors_per_block = ncp_reply_byte(server, 28);

	memset(&(target->volume_name), 0, sizeof(target->volume_name));

	result = -EIO;
	len = ncp_reply_byte(server, 29);
	if (len > NCP_VOLNAME_LEN) {
		DPRINTK("ncpfs: volume name too long: %d\n", len);
		goto out;
	}
	memcpy(&(target->volume_name), ncp_reply_data(server, 30), len);
	result = 0;
out:
	ncp_unlock_server(server);
	return result;
}

int ncp_get_directory_info(struct ncp_server* server, __u8 n, 
			   struct ncp_volume_info* target) {
	int result;
	int len;

	ncp_init_request_s(server, 45);
	ncp_add_byte(server, n);

	if ((result = ncp_request(server, 22)) != 0) {
		goto out;
	}
	target->total_blocks = ncp_reply_dword_lh(server, 0);
	target->free_blocks = ncp_reply_dword_lh(server, 4);
	target->purgeable_blocks = 0;
	target->not_yet_purgeable_blocks = 0;
	target->total_dir_entries = ncp_reply_dword_lh(server, 8);
	target->available_dir_entries = ncp_reply_dword_lh(server, 12);
	target->sectors_per_block = ncp_reply_byte(server, 20);

	memset(&(target->volume_name), 0, sizeof(target->volume_name));

	result = -EIO;
	len = ncp_reply_byte(server, 21);
	if (len > NCP_VOLNAME_LEN) {
		DPRINTK("ncpfs: volume name too long: %d\n", len);
		goto out;
	}
	memcpy(&(target->volume_name), ncp_reply_data(server, 22), len);
	result = 0;
out:
	ncp_unlock_server(server);
	return result;
}

int
ncp_close_file(struct ncp_server *server, const char *file_id)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 0);
	ncp_add_mem(server, file_id, 6);

	result = ncp_request(server, 66);
	ncp_unlock_server(server);
	return result;
}

int
ncp_make_closed(struct inode *inode)
{
	int err;

	err = 0;
	mutex_lock(&NCP_FINFO(inode)->open_mutex);
	if (atomic_read(&NCP_FINFO(inode)->opened) == 1) {
		atomic_set(&NCP_FINFO(inode)->opened, 0);
		err = ncp_close_file(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle);

		if (!err)
			PPRINTK("ncp_make_closed: volnum=%d, dirent=%u, error=%d\n",
				NCP_FINFO(inode)->volNumber,
				NCP_FINFO(inode)->dirEntNum, err);
	}
	mutex_unlock(&NCP_FINFO(inode)->open_mutex);
	return err;
}

static void ncp_add_handle_path(struct ncp_server *server, __u8 vol_num,
				__le32 dir_base, int have_dir_base, 
				const char *path)
{
	ncp_add_byte(server, vol_num);
	ncp_add_dword(server, dir_base);
	if (have_dir_base != 0) {
		ncp_add_byte(server, 1);	/* dir_base */
	} else {
		ncp_add_byte(server, 0xff);	/* no handle */
	}
	if (path != NULL) {
		ncp_add_byte(server, 1);	/* 1 component */
		ncp_add_pstring(server, path);
	} else {
		ncp_add_byte(server, 0);
	}
}

int ncp_dirhandle_alloc(struct ncp_server* server, __u8 volnum, __le32 dirent,
			__u8* dirhandle) {
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 12);		/* subfunction */
	ncp_add_byte(server, NW_NS_DOS);
	ncp_add_byte(server, 0);
	ncp_add_word(server, 0);
	ncp_add_handle_path(server, volnum, dirent, 1, NULL);
	if ((result = ncp_request(server, 87)) == 0) {
		*dirhandle = ncp_reply_byte(server, 0);
	}
	ncp_unlock_server(server);
	return result;
}

int ncp_dirhandle_free(struct ncp_server* server, __u8 dirhandle) {
	int result;
	
	ncp_init_request_s(server, 20);
	ncp_add_byte(server, dirhandle);
	result = ncp_request(server, 22);
	ncp_unlock_server(server);
	return result;
}

void ncp_extract_file_info(const void *structure, struct nw_info_struct *target)
{
	const __u8 *name_len;
	const int info_struct_size = offsetof(struct nw_info_struct, nameLen);

	memcpy(target, structure, info_struct_size);
	name_len = structure + info_struct_size;
	target->nameLen = *name_len;
	memcpy(target->entryName, name_len + 1, *name_len);
	target->entryName[*name_len] = '\0';
	target->volNumber = le32_to_cpu(target->volNumber);
	return;
}

#ifdef CONFIG_NCPFS_NFS_NS
static inline void ncp_extract_nfs_info(const unsigned char *structure,
				 struct nw_nfs_info *target)
{
	target->mode = DVAL_LH(structure);
	target->rdev = DVAL_LH(structure + 8);
}
#endif

int ncp_obtain_nfs_info(struct ncp_server *server,
		        struct nw_info_struct *target)

{
	int result = 0;
#ifdef CONFIG_NCPFS_NFS_NS
	__u32 volnum = target->volNumber;

	if (ncp_is_nfs_extras(server, volnum)) {
		ncp_init_request(server);
		ncp_add_byte(server, 19);	/* subfunction */
		ncp_add_byte(server, server->name_space[volnum]);
		ncp_add_byte(server, NW_NS_NFS);
		ncp_add_byte(server, 0);
		ncp_add_byte(server, volnum);
		ncp_add_dword(server, target->dirEntNum);
		/* We must retrieve both nlinks and rdev, otherwise some server versions
		   report zeroes instead of valid data */
		ncp_add_dword_lh(server, NSIBM_NFS_MODE | NSIBM_NFS_NLINKS | NSIBM_NFS_RDEV);

		if ((result = ncp_request(server, 87)) == 0) {
			ncp_extract_nfs_info(ncp_reply_data(server, 0), &target->nfs);
			DPRINTK(KERN_DEBUG
				"ncp_obtain_nfs_info: (%s) mode=0%o, rdev=0x%x\n",
				target->entryName, target->nfs.mode,
				target->nfs.rdev);
		} else {
			target->nfs.mode = 0;
			target->nfs.rdev = 0;
		}
	        ncp_unlock_server(server);

	} else
#endif
	{
		target->nfs.mode = 0;
		target->nfs.rdev = 0;
	}
	return result;
}

/*
 * Returns information for a (one-component) name relative to
 * the specified directory.
 */
int ncp_obtain_info(struct ncp_server *server, struct inode *dir, const char *path,
			struct nw_info_struct *target)
{
	__u8  volnum = NCP_FINFO(dir)->volNumber;
	__le32 dirent = NCP_FINFO(dir)->dirEntNum;
	int result;

	if (target == NULL) {
		printk(KERN_ERR "ncp_obtain_info: invalid call\n");
		return -EINVAL;
	}
	ncp_init_request(server);
	ncp_add_byte(server, 6);	/* subfunction */
	ncp_add_byte(server, server->name_space[volnum]);
	ncp_add_byte(server, server->name_space[volnum]); /* N.B. twice ?? */
	ncp_add_word(server, cpu_to_le16(0x8006));	/* get all */
	ncp_add_dword(server, RIM_ALL);
	ncp_add_handle_path(server, volnum, dirent, 1, path);

	if ((result = ncp_request(server, 87)) != 0)
		goto out;
	ncp_extract_file_info(ncp_reply_data(server, 0), target);
	ncp_unlock_server(server);
	
	result = ncp_obtain_nfs_info(server, target);
	return result;

out:
	ncp_unlock_server(server);
	return result;
}

#ifdef CONFIG_NCPFS_NFS_NS
static int
ncp_obtain_DOS_dir_base(struct ncp_server *server,
		__u8 ns, __u8 volnum, __le32 dirent,
		const char *path, /* At most 1 component */
		__le32 *DOS_dir_base)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 6); /* subfunction */
	ncp_add_byte(server, ns);
	ncp_add_byte(server, ns);
	ncp_add_word(server, cpu_to_le16(0x8006)); /* get all */
	ncp_add_dword(server, RIM_DIRECTORY);
	ncp_add_handle_path(server, volnum, dirent, 1, path);

	if ((result = ncp_request(server, 87)) == 0)
	{
	   	if (DOS_dir_base) *DOS_dir_base=ncp_reply_dword(server, 0x34);
	}
	ncp_unlock_server(server);
	return result;
}
#endif /* CONFIG_NCPFS_NFS_NS */

static inline int
ncp_get_known_namespace(struct ncp_server *server, __u8 volume)
{
#if defined(CONFIG_NCPFS_OS2_NS) || defined(CONFIG_NCPFS_NFS_NS)
	int result;
	__u8 *namespace;
	__u16 no_namespaces;

	ncp_init_request(server);
	ncp_add_byte(server, 24);	/* Subfunction: Get Name Spaces Loaded */
	ncp_add_word(server, 0);
	ncp_add_byte(server, volume);

	if ((result = ncp_request(server, 87)) != 0) {
		ncp_unlock_server(server);
		return NW_NS_DOS; /* not result ?? */
	}

	result = NW_NS_DOS;
	no_namespaces = ncp_reply_le16(server, 0);
	namespace = ncp_reply_data(server, 2);

	while (no_namespaces > 0) {
		DPRINTK("get_namespaces: found %d on %d\n", *namespace, volume);

#ifdef CONFIG_NCPFS_NFS_NS
		if ((*namespace == NW_NS_NFS) && !(server->m.flags&NCP_MOUNT_NO_NFS)) 
		{
			result = NW_NS_NFS;
			break;
		}
#endif	/* CONFIG_NCPFS_NFS_NS */
#ifdef CONFIG_NCPFS_OS2_NS
		if ((*namespace == NW_NS_OS2) && !(server->m.flags&NCP_MOUNT_NO_OS2))
		{
			result = NW_NS_OS2;
		}
#endif	/* CONFIG_NCPFS_OS2_NS */
		namespace += 1;
		no_namespaces -= 1;
	}
	ncp_unlock_server(server);
	return result;
#else	/* neither OS2 nor NFS - only DOS */
	return NW_NS_DOS;
#endif	/* defined(CONFIG_NCPFS_OS2_NS) || defined(CONFIG_NCPFS_NFS_NS) */
}

int
ncp_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns)
{
	int ns = ncp_get_known_namespace(server, volume);

	if (ret_ns)
		*ret_ns = ns;

	DPRINTK("lookup_vol: namespace[%d] = %d\n",
		volume, server->name_space[volume]);

	if (server->name_space[volume] == ns)
		return 0;
	server->name_space[volume] = ns;
	return 1;
}

static int
ncp_ObtainSpecificDirBase(struct ncp_server *server,
		__u8 nsSrc, __u8 nsDst, __u8 vol_num, __le32 dir_base,
		const char *path, /* At most 1 component */
		__le32 *dirEntNum, __le32 *DosDirNum)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 6); /* subfunction */
	ncp_add_byte(server, nsSrc);
	ncp_add_byte(server, nsDst);
	ncp_add_word(server, cpu_to_le16(0x8006)); /* get all */
	ncp_add_dword(server, RIM_ALL);
	ncp_add_handle_path(server, vol_num, dir_base, 1, path);

	if ((result = ncp_request(server, 87)) != 0)
	{
		ncp_unlock_server(server);
		return result;
	}

	if (dirEntNum)
		*dirEntNum = ncp_reply_dword(server, 0x30);
	if (DosDirNum)
		*DosDirNum = ncp_reply_dword(server, 0x34);
	ncp_unlock_server(server);
	return 0;
}

int
ncp_mount_subdir(struct ncp_server *server,
		 __u8 volNumber, __u8 srcNS, __le32 dirEntNum,
		 __u32* volume, __le32* newDirEnt, __le32* newDosEnt)
{
	int dstNS;
	int result;

	ncp_update_known_namespace(server, volNumber, &dstNS);
	if ((result = ncp_ObtainSpecificDirBase(server, srcNS, dstNS, volNumber, 
				      dirEntNum, NULL, newDirEnt, newDosEnt)) != 0)
	{
		return result;
	}
	*volume = volNumber;
	server->m.mounted_vol[1] = 0;
	server->m.mounted_vol[0] = 'X';
	return 0;
}

int 
ncp_get_volume_root(struct ncp_server *server,
		    const char *volname, __u32* volume, __le32* dirent, __le32* dosdirent)
{
	int result;

	DPRINTK("ncp_get_volume_root: looking up vol %s\n", volname);

	ncp_init_request(server);
	ncp_add_byte(server, 22);	/* Subfunction: Generate dir handle */
	ncp_add_byte(server, 0);	/* DOS namespace */
	ncp_add_byte(server, 0);	/* reserved */
	ncp_add_byte(server, 0);	/* reserved */
	ncp_add_byte(server, 0);	/* reserved */

	ncp_add_byte(server, 0);	/* faked volume number */
	ncp_add_dword(server, 0);	/* faked dir_base */
	ncp_add_byte(server, 0xff);	/* Don't have a dir_base */
	ncp_add_byte(server, 1);	/* 1 path component */
	ncp_add_pstring(server, volname);

	if ((result = ncp_request(server, 87)) != 0) {
		ncp_unlock_server(server);
		return result;
	}
	*dirent = *dosdirent = ncp_reply_dword(server, 4);
	*volume = ncp_reply_byte(server, 8);
	ncp_unlock_server(server);
	return 0;
}

int
ncp_lookup_volume(struct ncp_server *server,
		  const char *volname, struct nw_info_struct *target)
{
	int result;

	memset(target, 0, sizeof(*target));
	result = ncp_get_volume_root(server, volname,
			&target->volNumber, &target->dirEntNum, &target->DosDirNum);
	if (result) {
		return result;
	}
	ncp_update_known_namespace(server, target->volNumber, NULL);
	target->nameLen = strlen(volname);
	memcpy(target->entryName, volname, target->nameLen+1);
	target->attributes = aDIR;
	/* set dates to Jan 1, 1986  00:00 */
	target->creationTime = target->modifyTime = cpu_to_le16(0x0000);
	target->creationDate = target->modifyDate = target->lastAccessDate = cpu_to_le16(0x0C21);
	target->nfs.mode = 0;
	return 0;
}

int ncp_modify_file_or_subdir_dos_info_path(struct ncp_server *server,
					    struct inode *dir,
					    const char *path,
					    __le32 info_mask,
					    const struct nw_modify_dos_info *info)
{
	__u8  volnum = NCP_FINFO(dir)->volNumber;
	__le32 dirent = NCP_FINFO(dir)->dirEntNum;
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 7);	/* subfunction */
	ncp_add_byte(server, server->name_space[volnum]);
	ncp_add_byte(server, 0);	/* reserved */
	ncp_add_word(server, cpu_to_le16(0x8006));	/* search attribs: all */

	ncp_add_dword(server, info_mask);
	ncp_add_mem(server, info, sizeof(*info));
	ncp_add_handle_path(server, volnum, dirent, 1, path);

	result = ncp_request(server, 87);
	ncp_unlock_server(server);
	return result;
}

int ncp_modify_file_or_subdir_dos_info(struct ncp_server *server,
				       struct inode *dir,
				       __le32 info_mask,
				       const struct nw_modify_dos_info *info)
{
	return ncp_modify_file_or_subdir_dos_info_path(server, dir, NULL,
		info_mask, info);
}

#ifdef CONFIG_NCPFS_NFS_NS
int ncp_modify_nfs_info(struct ncp_server *server, __u8 volnum, __le32 dirent,
			       __u32 mode, __u32 rdev)

{
	int result = 0;

	ncp_init_request(server);
	if (server->name_space[volnum] == NW_NS_NFS) {
		ncp_add_byte(server, 25);	/* subfunction */
		ncp_add_byte(server, server->name_space[volnum]);
		ncp_add_byte(server, NW_NS_NFS);
		ncp_add_byte(server, volnum);
		ncp_add_dword(server, dirent);
		/* we must always operate on both nlinks and rdev, otherwise
		   rdev is not set */
		ncp_add_dword_lh(server, NSIBM_NFS_MODE | NSIBM_NFS_NLINKS | NSIBM_NFS_RDEV);
		ncp_add_dword_lh(server, mode);
		ncp_add_dword_lh(server, 1);	/* nlinks */
		ncp_add_dword_lh(server, rdev);
		result = ncp_request(server, 87);
	}
	ncp_unlock_server(server);
	return result;
}
#endif


static int
ncp_DeleteNSEntry(struct ncp_server *server,
		  __u8 have_dir_base, __u8 volnum, __le32 dirent,
		  const char* name, __u8 ns, __le16 attr)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 8);	/* subfunction */
	ncp_add_byte(server, ns);
	ncp_add_byte(server, 0);	/* reserved */
	ncp_add_word(server, attr);	/* search attribs: all */
	ncp_add_handle_path(server, volnum, dirent, have_dir_base, name);

	result = ncp_request(server, 87);
	ncp_unlock_server(server);
	return result;
}

int
ncp_del_file_or_subdir2(struct ncp_server *server,
			struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	__u8  volnum;
	__le32 dirent;

	if (!inode) {
		return 0xFF;	/* Any error */
	}
	volnum = NCP_FINFO(inode)->volNumber;
	dirent = NCP_FINFO(inode)->DosDirNum;
	return ncp_DeleteNSEntry(server, 1, volnum, dirent, NULL, NW_NS_DOS, cpu_to_le16(0x8006));
}

int
ncp_del_file_or_subdir(struct ncp_server *server,
		       struct inode *dir, const char *name)
{
	__u8  volnum = NCP_FINFO(dir)->volNumber;
	__le32 dirent = NCP_FINFO(dir)->dirEntNum;
	int name_space;

	name_space = server->name_space[volnum];
#ifdef CONFIG_NCPFS_NFS_NS
	if (name_space == NW_NS_NFS)
 	{
 		int result;
 
		result=ncp_obtain_DOS_dir_base(server, name_space, volnum, dirent, name, &dirent);
 		if (result) return result;
		name = NULL;
		name_space = NW_NS_DOS;
 	}
#endif	/* CONFIG_NCPFS_NFS_NS */
	return ncp_DeleteNSEntry(server, 1, volnum, dirent, name, name_space, cpu_to_le16(0x8006));
}

static inline void ConvertToNWfromDWORD(__u16 v0, __u16 v1, __u8 ret[6])
{
	__le16 *dest = (__le16 *) ret;
	dest[1] = cpu_to_le16(v0);
	dest[2] = cpu_to_le16(v1);
	dest[0] = cpu_to_le16(v0 + 1);
	return;
}

/* If both dir and name are NULL, then in target there's already a
   looked-up entry that wants to be opened. */
int ncp_open_create_file_or_subdir(struct ncp_server *server,
				   struct inode *dir, const char *name,
				   int open_create_mode,
				   __le32 create_attributes,
				   __le16 desired_acc_rights,
				   struct ncp_entry_info *target)
{
	__le16 search_attribs = cpu_to_le16(0x0006);
	__u8  volnum;
	__le32 dirent;
	int result;

	volnum = NCP_FINFO(dir)->volNumber;
	dirent = NCP_FINFO(dir)->dirEntNum;

	if ((create_attributes & aDIR) != 0) {
		search_attribs |= cpu_to_le16(0x8000);
	}
	ncp_init_request(server);
	ncp_add_byte(server, 1);	/* subfunction */
	ncp_add_byte(server, server->name_space[volnum]);
	ncp_add_byte(server, open_create_mode);
	ncp_add_word(server, search_attribs);
	ncp_add_dword(server, RIM_ALL);
	ncp_add_dword(server, create_attributes);
	/* The desired acc rights seem to be the inherited rights mask
	   for directories */
	ncp_add_word(server, desired_acc_rights);
	ncp_add_handle_path(server, volnum, dirent, 1, name);

	if ((result = ncp_request(server, 87)) != 0)
		goto out;
	if (!(create_attributes & aDIR))
		target->opened = 1;

	/* in target there's a new finfo to fill */
	ncp_extract_file_info(ncp_reply_data(server, 6), &(target->i));
	target->volume = target->i.volNumber;
	ConvertToNWfromDWORD(ncp_reply_le16(server, 0),
			     ncp_reply_le16(server, 2),
			     target->file_handle);
	
	ncp_unlock_server(server);

	(void)ncp_obtain_nfs_info(server, &(target->i));
	return 0;

out:
	ncp_unlock_server(server);
	return result;
}

int
ncp_initialize_search(struct ncp_server *server, struct inode *dir,
			struct nw_search_sequence *target)
{
	__u8  volnum = NCP_FINFO(dir)->volNumber;
	__le32 dirent = NCP_FINFO(dir)->dirEntNum;
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 2);	/* subfunction */
	ncp_add_byte(server, server->name_space[volnum]);
	ncp_add_byte(server, 0);	/* reserved */
	ncp_add_handle_path(server, volnum, dirent, 1, NULL);

	result = ncp_request(server, 87);
	if (result)
		goto out;
	memcpy(target, ncp_reply_data(server, 0), sizeof(*target));

out:
	ncp_unlock_server(server);
	return result;
}

int ncp_search_for_fileset(struct ncp_server *server,
			   struct nw_search_sequence *seq,
			   int* more,
			   int* cnt,
			   char* buffer,
			   size_t bufsize,
			   char** rbuf,
			   size_t* rsize)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 20);
	ncp_add_byte(server, server->name_space[seq->volNumber]);
	ncp_add_byte(server, 0);		/* datastream */
	ncp_add_word(server, cpu_to_le16(0x8006));
	ncp_add_dword(server, RIM_ALL);
	ncp_add_word(server, cpu_to_le16(32767));	/* max returned items */
	ncp_add_mem(server, seq, 9);
#ifdef CONFIG_NCPFS_NFS_NS
	if (server->name_space[seq->volNumber] == NW_NS_NFS) {
		ncp_add_byte(server, 0);	/* 0 byte pattern */
	} else 
#endif
	{
		ncp_add_byte(server, 2);	/* 2 byte pattern */
		ncp_add_byte(server, 0xff);	/* following is a wildcard */
		ncp_add_byte(server, '*');
	}
	result = ncp_request2(server, 87, buffer, bufsize);
	if (result) {
		ncp_unlock_server(server);
		return result;
	}
	if (server->ncp_reply_size < 12) {
		ncp_unlock_server(server);
		return 0xFF;
	}
	*rsize = server->ncp_reply_size - 12;
	ncp_unlock_server(server);
	buffer = buffer + sizeof(struct ncp_reply_header);
	*rbuf = buffer + 12;
	*cnt = WVAL_LH(buffer + 10);
	*more = BVAL(buffer + 9);
	memcpy(seq, buffer, 9);
	return 0;
}

static int
ncp_RenameNSEntry(struct ncp_server *server,
		  struct inode *old_dir, const char *old_name, __le16 old_type,
		  struct inode *new_dir, const char *new_name)
{
	int result = -EINVAL;

	if ((old_dir == NULL) || (old_name == NULL) ||
	    (new_dir == NULL) || (new_name == NULL))
		goto out;

	ncp_init_request(server);
	ncp_add_byte(server, 4);	/* subfunction */
	ncp_add_byte(server, server->name_space[NCP_FINFO(old_dir)->volNumber]);
	ncp_add_byte(server, 1);	/* rename flag */
	ncp_add_word(server, old_type);	/* search attributes */

	/* source Handle Path */
	ncp_add_byte(server, NCP_FINFO(old_dir)->volNumber);
	ncp_add_dword(server, NCP_FINFO(old_dir)->dirEntNum);
	ncp_add_byte(server, 1);
	ncp_add_byte(server, 1);	/* 1 source component */

	/* dest Handle Path */
	ncp_add_byte(server, NCP_FINFO(new_dir)->volNumber);
	ncp_add_dword(server, NCP_FINFO(new_dir)->dirEntNum);
	ncp_add_byte(server, 1);
	ncp_add_byte(server, 1);	/* 1 destination component */

	/* source path string */
	ncp_add_pstring(server, old_name);
	/* dest path string */
	ncp_add_pstring(server, new_name);

	result = ncp_request(server, 87);
	ncp_unlock_server(server);
out:
	return result;
}

int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server,
				struct inode *old_dir, const char *old_name,
				struct inode *new_dir, const char *new_name)
{
        int result;
        __le16 old_type = cpu_to_le16(0x06);

/* If somebody can do it atomic, call me... vandrove@vc.cvut.cz */
	result = ncp_RenameNSEntry(server, old_dir, old_name, old_type,
	                                   new_dir, new_name);
        if (result == 0xFF)	/* File Not Found, try directory */
	{
		old_type = cpu_to_le16(0x16);
		result = ncp_RenameNSEntry(server, old_dir, old_name, old_type,
						   new_dir, new_name);
	}
	if (result != 0x92) return result;	/* All except NO_FILES_RENAMED */
	result = ncp_del_file_or_subdir(server, new_dir, new_name);
	if (result != 0) return -EACCES;
	result = ncp_RenameNSEntry(server, old_dir, old_name, old_type,
					   new_dir, new_name);
	return result;
}
	

/* We have to transfer to/from user space */
int
ncp_read_kernel(struct ncp_server *server, const char *file_id,
	     __u32 offset, __u16 to_read, char *target, int *bytes_read)
{
	const char *source;
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 0);
	ncp_add_mem(server, file_id, 6);
	ncp_add_be32(server, offset);
	ncp_add_be16(server, to_read);

	if ((result = ncp_request(server, 72)) != 0) {
		goto out;
	}
	*bytes_read = ncp_reply_be16(server, 0);
	source = ncp_reply_data(server, 2 + (offset & 1));

	memcpy(target, source, *bytes_read);
out:
	ncp_unlock_server(server);
	return result;
}

/* There is a problem... egrep and some other silly tools do:
	x = mmap(NULL, MAP_PRIVATE, PROT_READ|PROT_WRITE, <ncpfs fd>, 32768);
	read(<ncpfs fd>, x, 32768);
   Now copying read result by copy_to_user causes pagefault. This pagefault
   could not be handled because of server was locked due to read. So we have
   to use temporary buffer. So ncp_unlock_server must be done before
   copy_to_user (and for write, copy_from_user must be done before 
   ncp_init_request... same applies for send raw packet ioctl). Because of
   file is normally read in bigger chunks, caller provides kmalloced 
   (vmalloced) chunk of memory with size >= to_read...
 */
int
ncp_read_bounce(struct ncp_server *server, const char *file_id,
	 __u32 offset, __u16 to_read, char __user *target, int *bytes_read,
	 void* bounce, __u32 bufsize)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 0);
	ncp_add_mem(server, file_id, 6);
	ncp_add_be32(server, offset);
	ncp_add_be16(server, to_read);
	result = ncp_request2(server, 72, bounce, bufsize);
	ncp_unlock_server(server);
	if (!result) {
		int len = get_unaligned_be16((char *)bounce +
			  sizeof(struct ncp_reply_header));
		result = -EIO;
		if (len <= to_read) {
			char* source;

			source = (char*)bounce + 
			         sizeof(struct ncp_reply_header) + 2 + 
			         (offset & 1);
			*bytes_read = len;
			result = 0;
			if (copy_to_user(target, source, len))
				result = -EFAULT;
		}
	}
	return result;
}

int
ncp_write_kernel(struct ncp_server *server, const char *file_id,
		 __u32 offset, __u16 to_write,
		 const char *source, int *bytes_written)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 0);
	ncp_add_mem(server, file_id, 6);
	ncp_add_be32(server, offset);
	ncp_add_be16(server, to_write);
	ncp_add_mem(server, source, to_write);
	
	if ((result = ncp_request(server, 73)) == 0)
		*bytes_written = to_write;
	ncp_unlock_server(server);
	return result;
}

#ifdef CONFIG_NCPFS_IOCTL_LOCKING
int
ncp_LogPhysicalRecord(struct ncp_server *server, const char *file_id,
	  __u8 locktype, __u32 offset, __u32 length, __u16 timeout)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, locktype);
	ncp_add_mem(server, file_id, 6);
	ncp_add_be32(server, offset);
	ncp_add_be32(server, length);
	ncp_add_be16(server, timeout);

	if ((result = ncp_request(server, 0x1A)) != 0)
	{
		ncp_unlock_server(server);
		return result;
	}
	ncp_unlock_server(server);
	return 0;
}

int
ncp_ClearPhysicalRecord(struct ncp_server *server, const char *file_id,
	  __u32 offset, __u32 length)
{
	int result;

	ncp_init_request(server);
	ncp_add_byte(server, 0);	/* who knows... lanalyzer says that */
	ncp_add_mem(server, file_id, 6);
	ncp_add_be32(server, offset);
	ncp_add_be32(server, length);

	if ((result = ncp_request(server, 0x1E)) != 0)
	{
		ncp_unlock_server(server);
		return result;
	}
	ncp_unlock_server(server);
	return 0;
}
#endif	/* CONFIG_NCPFS_IOCTL_LOCKING */

#ifdef CONFIG_NCPFS_NLS
/* This are the NLS conversion routines with inspirations and code parts
 * from the vfat file system and hints from Petr Vandrovec.
 */

int
ncp__io2vol(struct ncp_server *server, unsigned char *vname, unsigned int *vlen,
		const unsigned char *iname, unsigned int ilen, int cc)
{
	struct nls_table *in = server->nls_io;
	struct nls_table *out = server->nls_vol;
	unsigned char *vname_start;
	unsigned char *vname_end;
	const unsigned char *iname_end;

	iname_end = iname + ilen;
	vname_start = vname;
	vname_end = vname + *vlen - 1;

	while (iname < iname_end) {
		int chl;
		wchar_t ec;

		if (NCP_IS_FLAG(server, NCP_FLAG_UTF8)) {
			int k;
			unicode_t u;

			k = utf8_to_utf32(iname, iname_end - iname, &u);
			if (k < 0 || u > MAX_WCHAR_T)
				return -EINVAL;
			iname += k;
			ec = u;
		} else {
			if (*iname == NCP_ESC) {
				int k;

				if (iname_end - iname < 5)
					goto nospec;

				ec = 0;
				for (k = 1; k < 5; k++) {
					unsigned char nc;

					nc = iname[k] - '0';
					if (nc >= 10) {
						nc -= 'A' - '0' - 10;
						if ((nc < 10) || (nc > 15)) {
							goto nospec;
						}
					}
					ec = (ec << 4) | nc;
				}
				iname += 5;
			} else {
nospec:;			
				if ( (chl = in->char2uni(iname, iname_end - iname, &ec)) < 0)
					return chl;
				iname += chl;
			}
		}

		/* unitoupper should be here! */

		chl = out->uni2char(ec, vname, vname_end - vname);
		if (chl < 0)
			return chl;

		/* this is wrong... */
		if (cc) {
			int chi;

			for (chi = 0; chi < chl; chi++){
				vname[chi] = ncp_toupper(out, vname[chi]);
			}
		}
		vname += chl;
	}

	*vname = 0;
	*vlen = vname - vname_start;
	return 0;
}

int
ncp__vol2io(struct ncp_server *server, unsigned char *iname, unsigned int *ilen,
		const unsigned char *vname, unsigned int vlen, int cc)
{
	struct nls_table *in = server->nls_vol;
	struct nls_table *out = server->nls_io;
	const unsigned char *vname_end;
	unsigned char *iname_start;
	unsigned char *iname_end;
	unsigned char *vname_cc;
	int err;

	vname_cc = NULL;

	if (cc) {
		int i;

		/* this is wrong! */
		vname_cc = kmalloc(vlen, GFP_KERNEL);
		if (!vname_cc)
			return -ENOMEM;
		for (i = 0; i < vlen; i++)
			vname_cc[i] = ncp_tolower(in, vname[i]);
		vname = vname_cc;
	}

	iname_start = iname;
	iname_end = iname + *ilen - 1;
	vname_end = vname + vlen;

	while (vname < vname_end) {
		wchar_t ec;
		int chl;

		if ( (chl = in->char2uni(vname, vname_end - vname, &ec)) < 0) {
			err = chl;
			goto quit;
		}
		vname += chl;

		/* unitolower should be here! */

		if (NCP_IS_FLAG(server, NCP_FLAG_UTF8)) {
			int k;

			k = utf32_to_utf8(ec, iname, iname_end - iname);
			if (k < 0) {
				err = -ENAMETOOLONG;
				goto quit;
			}
			iname += k;
		} else {
			if ( (chl = out->uni2char(ec, iname, iname_end - iname)) >= 0) {
				iname += chl;
			} else {
				int k;

				if (iname_end - iname < 5) {
					err = -ENAMETOOLONG;
					goto quit;
				}
				*iname = NCP_ESC;
				for (k = 4; k > 0; k--) {
					unsigned char v;
					
					v = (ec & 0xF) + '0';
					if (v > '9') {
						v += 'A' - '9' - 1;
					}
					iname[k] = v;
					ec >>= 4;
				}
				iname += 5;
			}
		}
	}

	*iname = 0;
	*ilen = iname - iname_start;
	err = 0;
quit:;
	if (cc)
		kfree(vname_cc);
	return err;
}

#else

int
ncp__io2vol(unsigned char *vname, unsigned int *vlen,
		const unsigned char *iname, unsigned int ilen, int cc)
{
	int i;

	if (*vlen <= ilen)
		return -ENAMETOOLONG;

	if (cc)
		for (i = 0; i < ilen; i++) {
			*vname = toupper(*iname);
			vname++;
			iname++;
		}
	else {
		memmove(vname, iname, ilen);
		vname += ilen;
	}

	*vlen = ilen;
	*vname = 0;
	return 0;
}

int
ncp__vol2io(unsigned char *iname, unsigned int *ilen,
		const unsigned char *vname, unsigned int vlen, int cc)
{
	int i;

	if (*ilen <= vlen)
		return -ENAMETOOLONG;

	if (cc)
		for (i = 0; i < vlen; i++) {
			*iname = tolower(*vname);
			iname++;
			vname++;
		}
	else {
		memmove(iname, vname, vlen);
		iname += vlen;
	}

	*ilen = vlen;
	*iname = 0;
	return 0;
}

#endif