1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2016 Toomas Soome <tsoome@me.com> 24 * Copyright 2022 Tintri by DDN, Inc. All rights reserved. 25 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #include <devfsadm.h> 30 #include <stdio.h> 31 #include <strings.h> 32 #include <stdlib.h> 33 #include <limits.h> 34 #include <ctype.h> 35 #include <unistd.h> 36 #include <sys/int_fmtio.h> 37 #include <sys/stat.h> 38 #include <bsm/devalloc.h> 39 #include <sys/scsi/scsi_address.h> 40 #include <sys/libdevid.h> 41 #include <sys/lofi.h> 42 43 #define DISK_SUBPATH_MAX 100 44 #define RM_STALE 0x01 45 #define DISK_LINK_RE "^r?dsk/c[0-9]+(t[0-9A-F]+)?d[0-9]+(((s|p))[0-9]+)?$" 46 #define DISK_LINK_TO_UPPER(ch)\ 47 (((ch) >= 'a' && (ch) <= 'z') ? (ch - 'a' + 'A') : ch) 48 49 #define SLICE_SMI "s7" 50 #define SLICE_EFI "" 51 52 #define MN_SMI "h" 53 #define MN_EFI "wd" 54 #define ASCIIWWNSIZE 255 55 #if defined(__i386) || defined(__amd64) 56 /* 57 * The number of minor nodes per LUN is defined by the disk drivers. 58 * Currently it is set to 64. Refer CMLBUNIT_SHIFT (cmlb_impl.h) 59 */ 60 #define NUM_MINORS_PER_INSTANCE 64 61 #endif 62 63 64 extern int system_labeled; 65 66 static int disk_callback_chan(di_minor_t minor, di_node_t node); 67 static int disk_callback_nchan(di_minor_t minor, di_node_t node); 68 static int disk_callback_blkdev(di_minor_t minor, di_node_t node); 69 static int disk_callback_wwn(di_minor_t minor, di_node_t node); 70 static int disk_callback_xvmd(di_minor_t minor, di_node_t node); 71 static int disk_callback_fabric(di_minor_t minor, di_node_t node); 72 static int disk_callback_sas(di_minor_t minor, di_node_t node); 73 static void disk_common(di_minor_t minor, di_node_t node, char *disk, 74 int flags); 75 static char *diskctrl(di_node_t node, di_minor_t minor); 76 static int reserved_links_exist(di_node_t node, di_minor_t minor, int nflags); 77 static void disk_rm_lofi_all(char *file); 78 79 80 static devfsadm_create_t disk_cbt[] = { 81 { "disk", DDI_NT_BLOCK, NULL, 82 TYPE_EXACT, ILEVEL_0, disk_callback_nchan 83 }, 84 { "disk", DDI_NT_BLOCK_CHAN, NULL, 85 TYPE_EXACT, ILEVEL_0, disk_callback_chan 86 }, 87 { "disk", DDI_NT_BLOCK_BLKDEV, NULL, 88 TYPE_EXACT, ILEVEL_0, disk_callback_blkdev 89 }, 90 { "disk", DDI_NT_BLOCK_FABRIC, NULL, 91 TYPE_EXACT, ILEVEL_0, disk_callback_fabric 92 }, 93 { "disk", DDI_NT_BLOCK_WWN, NULL, 94 TYPE_EXACT, ILEVEL_0, disk_callback_wwn 95 }, 96 { "disk", DDI_NT_BLOCK_SAS, NULL, 97 TYPE_EXACT, ILEVEL_0, disk_callback_sas 98 }, 99 { "disk", DDI_NT_CD, NULL, 100 TYPE_EXACT, ILEVEL_0, disk_callback_nchan 101 }, 102 { "disk", DDI_NT_CD_CHAN, NULL, 103 TYPE_EXACT, ILEVEL_0, disk_callback_chan 104 }, 105 { "disk", DDI_NT_BLOCK_XVMD, NULL, 106 TYPE_EXACT, ILEVEL_0, disk_callback_xvmd 107 }, 108 { "disk", DDI_NT_CD_XVMD, NULL, 109 TYPE_EXACT, ILEVEL_0, disk_callback_xvmd 110 }, 111 }; 112 113 DEVFSADM_CREATE_INIT_V0(disk_cbt); 114 115 /* 116 * HOT auto cleanup of disks is done for lofi devices only. 117 */ 118 static devfsadm_remove_t disk_remove_cbt[] = { 119 { "disk", DISK_LINK_RE, RM_HOT | RM_POST | RM_ALWAYS, 120 ILEVEL_0, disk_rm_lofi_all 121 }, 122 { "disk", DISK_LINK_RE, RM_POST, 123 ILEVEL_0, devfsadm_rm_all 124 } 125 }; 126 127 DEVFSADM_REMOVE_INIT_V0(disk_remove_cbt); 128 129 static devlink_re_t disks_re_array[] = { 130 {"^r?dsk/c([0-9]+)", 1}, 131 {"^cfg/c([0-9]+)$", 1}, 132 {"^scsi/.+/c([0-9]+)", 1}, 133 {NULL} 134 }; 135 136 static char *disk_mid = "disk_mid"; 137 static char *modname = "disk_link"; 138 139 /* 140 * Check if link is from lofi by checking path from readlink(). 141 */ 142 static int 143 is_lofi_disk(char *file) 144 { 145 char buf[PATH_MAX + 1]; 146 char filepath[PATH_MAX]; 147 char *ptr; 148 ssize_t size; 149 150 size = snprintf(filepath, sizeof (filepath), "%s/dev/%s", 151 devfsadm_root_path(), file); 152 if (size > sizeof (filepath)) 153 return (0); 154 155 size = readlink(filepath, buf, sizeof (buf) - 1); 156 if (size == -1) 157 return (0); 158 buf[size] = '\0'; 159 ptr = strchr(buf, '@'); 160 if (ptr == NULL) 161 return (0); 162 ptr[1] = '\0'; 163 if (strcmp(buf, "../../devices/pseudo/lofi@") != 0) 164 return (0); 165 return (1); 166 } 167 168 /* 169 * Wrapper around devfsadm_rm_link() for lofi devices. 170 */ 171 static void disk_rm_lofi_all(char *file) 172 { 173 if (is_lofi_disk(file)) 174 devfsadm_rm_link(file); 175 } 176 177 int 178 minor_init() 179 { 180 devfsadm_print(disk_mid, 181 "%s: minor_init(): Creating disks reserved ID cache\n", 182 modname); 183 return (devfsadm_reserve_id_cache(disks_re_array, NULL)); 184 } 185 186 static int 187 disk_callback_chan(di_minor_t minor, di_node_t node) 188 { 189 char *addr; 190 char disk[23]; 191 char *driver; 192 uint_t targ = 0; 193 uint_t lun = 0; 194 195 driver = di_driver_name(node); 196 if (strcmp(driver, LOFI_DRIVER_NAME) != 0) { 197 addr = di_bus_addr(node); 198 (void) sscanf(addr, "%X,%X", &targ, &lun); 199 } else { 200 targ = di_instance(node); 201 } 202 203 (void) snprintf(disk, sizeof (disk), "t%dd%d", targ, lun); 204 disk_common(minor, node, disk, 0); 205 return (DEVFSADM_CONTINUE); 206 207 } 208 209 static int 210 disk_callback_nchan(di_minor_t minor, di_node_t node) 211 { 212 char *addr; 213 char disk[10]; 214 uint_t lun; 215 216 addr = di_bus_addr(node); 217 (void) sscanf(addr, "%X", &lun); 218 (void) sprintf(disk, "d%d", lun); 219 disk_common(minor, node, disk, 0); 220 return (DEVFSADM_CONTINUE); 221 222 } 223 224 static int 225 disk_callback_blkdev(di_minor_t minor, di_node_t node) 226 { 227 char *addr; 228 char disk[DISK_SUBPATH_MAX]; 229 char guid[50]; 230 uint_t lun = 0; 231 232 addr = di_bus_addr(node); 233 (void) sscanf(addr, "w%49[0-9A-F],%X", &guid, &lun); 234 (void) snprintf(disk, DISK_SUBPATH_MAX, "t%sd%d", guid, lun); 235 disk_common(minor, node, disk, RM_STALE); 236 return (DEVFSADM_CONTINUE); 237 } 238 239 static int 240 disk_callback_wwn(di_minor_t minor, di_node_t node) 241 { 242 char disk[10]; 243 int lun; 244 int targ; 245 int *intp; 246 247 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, SCSI_ADDR_PROP_TARGET, 248 &intp) <= 0) { 249 return (DEVFSADM_CONTINUE); 250 } 251 targ = *intp; 252 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, SCSI_ADDR_PROP_LUN, 253 &intp) <= 0) { 254 lun = 0; 255 } else { 256 lun = *intp; 257 } 258 (void) sprintf(disk, "t%dd%d", targ, lun); 259 260 disk_common(minor, node, disk, RM_STALE); 261 262 return (DEVFSADM_CONTINUE); 263 } 264 265 static int 266 disk_callback_fabric(di_minor_t minor, di_node_t node) 267 { 268 char disk[DISK_SUBPATH_MAX]; 269 int lun; 270 int count; 271 int *intp; 272 uchar_t *str; 273 uchar_t *wwn; 274 uchar_t ascii_wwn[ASCIIWWNSIZE]; 275 276 if (di_prop_lookup_strings(DDI_DEV_T_ANY, node, 277 "client-guid", (char **)&wwn) > 0) { 278 if (strlcpy((char *)ascii_wwn, (char *)wwn, 279 sizeof (ascii_wwn)) >= sizeof (ascii_wwn)) { 280 devfsadm_errprint("SUNW_disk_link: GUID too long:%d", 281 strlen((char *)wwn)); 282 return (DEVFSADM_CONTINUE); 283 } 284 lun = 0; 285 } else if (di_prop_lookup_bytes(DDI_DEV_T_ANY, node, 286 "port-wwn", &wwn) > 0) { 287 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 288 SCSI_ADDR_PROP_LUN, &intp) > 0) { 289 lun = *intp; 290 } else { 291 lun = 0; 292 } 293 294 for (count = 0, str = ascii_wwn; count < 8; count++, str += 2) { 295 (void) sprintf((caddr_t)str, "%02x", wwn[count]); 296 } 297 *str = '\0'; 298 } else { 299 return (DEVFSADM_CONTINUE); 300 } 301 302 for (str = ascii_wwn; *str != '\0'; str++) { 303 *str = DISK_LINK_TO_UPPER(*str); 304 } 305 306 (void) snprintf(disk, DISK_SUBPATH_MAX, "t%sd%d", ascii_wwn, lun); 307 308 disk_common(minor, node, disk, RM_STALE); 309 310 return (DEVFSADM_CONTINUE); 311 } 312 313 static int 314 disk_callback_sas(di_minor_t minor, di_node_t node) 315 { 316 char disk[DISK_SUBPATH_MAX]; 317 int lun64_found = 0; 318 scsi_lun64_t lun64, sl; 319 scsi_lun_t lun; 320 int64_t *lun64p; 321 uint64_t wwn; 322 int *intp; 323 char *tgt_port; 324 uchar_t addr_method; 325 326 /* Get lun property */ 327 if (di_prop_lookup_int64(DDI_DEV_T_ANY, node, 328 SCSI_ADDR_PROP_LUN64, &lun64p) > 0) { 329 if (*lun64p != SCSI_LUN64_ILLEGAL) { 330 lun64_found = 1; 331 lun64 = (uint64_t)*lun64p; 332 } 333 } 334 if ((!lun64_found) && (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 335 SCSI_ADDR_PROP_LUN, &intp) > 0)) { 336 lun64 = (uint64_t)*intp; 337 } 338 339 lun = scsi_lun64_to_lun(lun64); 340 341 addr_method = (lun.sl_lun1_msb & SCSI_LUN_AM_MASK); 342 343 if (di_prop_lookup_strings(DDI_DEV_T_ANY, node, 344 SCSI_ADDR_PROP_TARGET_PORT, &tgt_port) > 0) { 345 (void) scsi_wwnstr_to_wwn(tgt_port, &wwn); 346 if ((addr_method == SCSI_LUN_AM_PDEV) && 347 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) && 348 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) && 349 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) { 350 (void) snprintf(disk, DISK_SUBPATH_MAX, 351 "t%"PRIX64"d%"PRId64, wwn, lun64); 352 } else if ((addr_method == SCSI_LUN_AM_FLAT) && 353 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) && 354 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) && 355 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) { 356 sl = (lun.sl_lun1_msb << 8) | lun.sl_lun1_lsb; 357 (void) snprintf(disk, DISK_SUBPATH_MAX, 358 "t%"PRIX64"d%"PRIX16, wwn, sl); 359 } else { 360 (void) snprintf(disk, DISK_SUBPATH_MAX, 361 "t%"PRIX64"d%"PRIX64, wwn, lun64); 362 } 363 } else if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 364 SCSI_ADDR_PROP_SATA_PHY, &intp) > 0) { 365 /* Use phy format naming, for SATA devices without wwn */ 366 if ((addr_method == SCSI_LUN_AM_PDEV) && 367 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) && 368 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) && 369 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) { 370 (void) snprintf(disk, DISK_SUBPATH_MAX, 371 "t%dd%"PRId64, *intp, lun64); 372 } else if ((addr_method == SCSI_LUN_AM_FLAT) && 373 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) && 374 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) && 375 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) { 376 sl = (lun.sl_lun1_msb << 8) | lun.sl_lun1_lsb; 377 (void) snprintf(disk, DISK_SUBPATH_MAX, 378 "t%dd%"PRIX16, *intp, sl); 379 } else { 380 (void) snprintf(disk, DISK_SUBPATH_MAX, 381 "t%dd%"PRIX64, *intp, lun64); 382 } 383 } else { 384 return (DEVFSADM_CONTINUE); 385 } 386 387 disk_common(minor, node, disk, RM_STALE); 388 389 return (DEVFSADM_CONTINUE); 390 } 391 392 /* 393 * xVM virtual block device 394 * 395 * Xen passes device number in the following format: 396 * 397 * 1 << 28 | disk << 8 | partition xvd, disks or partitions 16 onwards 398 * 202 << 8 | disk << 4 | partition xvd, disks and partitions up to 15 399 * 8 << 8 | disk << 4 | partition sd, disks and partitions up to 15 400 * 3 << 8 | disk << 6 | partition hd, disks 0..1, partitions 0..63 401 * 22 << 8 | (disk-2) << 6 | partition hd, disks 2..3, partitions 0..63 402 * 2 << 28 onwards reserved for future use 403 * other values less than 1 << 28 deprecated / reserved 404 * 405 * The corresponding /dev/dsk name can be: 406 * 407 * c0tYdX 408 * 409 * where Y,X >= 0. 410 * 411 * For PV guests using the legacy naming (0, 1, 2, ...) 412 * the disk names created will be c0d[0..767]. 413 */ 414 415 #define HD_BASE (3 << 8) 416 #define XEN_EXT_SHIFT (28) 417 418 /* 419 * Return: Number of parsed and written parameters 420 */ 421 static int 422 decode_xen_device(uint_t device, uint_t *disk, uint_t *plun) 423 { 424 uint_t dsk, lun = 0; 425 int ret = 1; 426 427 if ((device >> XEN_EXT_SHIFT) > 1) 428 return (0); 429 430 if (device < HD_BASE) { 431 /* legacy device address */ 432 dsk = device; 433 goto end; 434 } 435 436 ret = 2; 437 if (device & (1 << XEN_EXT_SHIFT)) { 438 /* extended */ 439 dsk = device & (~0xff); 440 lun = device & 0xff; 441 goto end; 442 } 443 444 switch (device >> 8) { 445 case 202: /* xvd */ 446 dsk = (device >> 4) & 0xf; 447 lun = device & 0xf; 448 break; 449 case 8: /* sd */ 450 dsk = device & (~0xf); 451 lun = device & 0xf; 452 break; 453 case 3: /* hd, disk 0..1 */ 454 dsk = (device >> 6) & 0x1; 455 lun = device & 0x3f; 456 break; 457 case 22: /* hd, disk 2..3 */ 458 dsk = ((device >> 6) & 0x1) + 2; 459 lun = device & 0x3f; 460 break; 461 default: 462 return (0); 463 } 464 end: 465 *disk = dsk; 466 *plun = lun; 467 return (ret); 468 } 469 470 static int 471 disk_callback_xvmd(di_minor_t minor, di_node_t node) 472 { 473 char *addr; 474 char disk[16]; 475 uint_t targ; 476 uint_t dsk, lun; 477 int res; 478 479 addr = di_bus_addr(node); 480 targ = strtol(addr, (char **)NULL, 10); 481 482 res = decode_xen_device(targ, &dsk, &lun); 483 484 /* HVM device names are generated using the standard generator */ 485 486 if (res == 1) 487 (void) snprintf(disk, sizeof (disk), "d%d", dsk); 488 else if (res == 2) 489 (void) snprintf(disk, sizeof (disk), "t%dd%d", dsk, lun); 490 else { 491 devfsadm_errprint("%s: invalid disk device number (%s)\n", 492 modname, addr); 493 return (DEVFSADM_CONTINUE); 494 } 495 disk_common(minor, node, disk, 0); 496 return (DEVFSADM_CONTINUE); 497 } 498 499 /* 500 * This function is called for every disk minor node. 501 * Calls enumerate to assign a logical controller number, and 502 * then devfsadm_mklink to make the link. 503 */ 504 static void 505 disk_common(di_minor_t minor, di_node_t node, char *disk, int flags) 506 { 507 char l_path[PATH_MAX + 1]; 508 char sec_path[PATH_MAX + 1]; 509 char stale_re[DISK_SUBPATH_MAX]; 510 char *dir; 511 char slice[4]; 512 char *mn; 513 char *ctrl; 514 char *nt = NULL; 515 int *int_prop; 516 int nflags = 0; 517 #if defined(__i386) || defined(__amd64) 518 char mn_copy[4]; 519 char *part; 520 int part_num; 521 #endif 522 523 mn = di_minor_name(minor); 524 if (strstr(mn, ",raw")) { 525 dir = "rdsk"; 526 #if defined(__i386) || defined(__amd64) 527 (void) strncpy(mn_copy, mn, 4); 528 part = strtok(mn_copy, ","); 529 #endif 530 } else { 531 dir = "dsk"; 532 #if defined(__i386) || defined(__amd64) 533 part = mn; 534 #endif 535 } 536 537 #if defined(__i386) || defined(__amd64) 538 /* 539 * The following is a table describing the allocation of 540 * minor numbers, minor names and /dev/dsk names for partitions 541 * and slices on x86 systems. 542 * 543 * Minor Number Minor Name /dev/dsk name 544 * --------------------------------------------- 545 * 0 to 15 "a" to "p" s0 to s15 546 * 16 "q" p0 547 * 17 to 20 "r" to "u" p1 to p4 548 * 21 to 52 "p5" to "p36" p5 to p36 549 * 550 */ 551 part_num = atoi(part + 1); 552 553 if ((mn[0] == 'p') && (part_num >= 5)) { 554 /* logical drive */ 555 (void) snprintf(slice, 4, "%s", part); 556 } else { 557 #endif 558 if (mn[0] < 'q') { 559 (void) sprintf(slice, "s%d", mn[0] - 'a'); 560 } else if (strncmp(mn, MN_EFI, 2) != 0) { 561 (void) sprintf(slice, "p%d", mn[0] - 'q'); 562 } else { 563 /* For EFI label */ 564 (void) sprintf(slice, SLICE_EFI); 565 } 566 #if defined(__i386) || defined(__amd64) 567 } 568 #endif 569 570 nflags = 0; 571 if (system_labeled) { 572 nt = di_minor_nodetype(minor); 573 if ((nt != NULL) && 574 ((strcmp(nt, DDI_NT_CD) == 0) || 575 (strcmp(nt, DDI_NT_CD_CHAN) == 0) || 576 (strcmp(nt, DDI_NT_BLOCK_CHAN) == 0))) { 577 nflags = DA_ADD|DA_CD; 578 } 579 } 580 581 if (reserved_links_exist(node, minor, nflags) == DEVFSADM_SUCCESS) { 582 devfsadm_print(disk_mid, "Reserved link exists. Not " 583 "creating links for slice %s\n", slice); 584 return; 585 } 586 587 if (NULL == (ctrl = diskctrl(node, minor))) 588 return; 589 590 (void) strcpy(l_path, dir); 591 (void) strcat(l_path, "/c"); 592 (void) strcat(l_path, ctrl); 593 (void) strcat(l_path, disk); 594 595 /* 596 * If switching between SMI and EFI label or vice versa 597 * cleanup the previous label's devlinks. 598 */ 599 if (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0)) { 600 char *s, tpath[PATH_MAX + 1]; 601 struct stat sb; 602 603 s = l_path + strlen(l_path); 604 (void) strcat(l_path, (*mn == *(MN_SMI)) 605 ? SLICE_EFI : SLICE_SMI); 606 /* 607 * Attempt the remove only if the stale link exists 608 */ 609 (void) snprintf(tpath, sizeof (tpath), "%s/dev/%s", 610 devfsadm_root_path(), l_path); 611 if (lstat(tpath, &sb) != -1) 612 devfsadm_rm_all(l_path); 613 *s = '\0'; 614 } 615 (void) strcat(l_path, slice); 616 617 (void) devfsadm_mklink(l_path, node, minor, nflags); 618 619 /* secondary links for removable and hotpluggable devices */ 620 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "removable-media", 621 &int_prop) >= 0) { 622 (void) strcpy(sec_path, "removable-media/"); 623 (void) strcat(sec_path, l_path); 624 (void) devfsadm_secondary_link(sec_path, l_path, 0); 625 } 626 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "hotpluggable", 627 &int_prop) >= 0) { 628 (void) strcpy(sec_path, "hotpluggable/"); 629 (void) strcat(sec_path, l_path); 630 (void) devfsadm_secondary_link(sec_path, l_path, 0); 631 } 632 633 if ((flags & RM_STALE) == RM_STALE) { 634 (void) strcpy(stale_re, "^"); 635 (void) strcat(stale_re, dir); 636 (void) strcat(stale_re, "/c"); 637 (void) strcat(stale_re, ctrl); 638 (void) strcat(stale_re, "t[0-9A-F]+d[0-9]+(s[0-9]+)?$"); 639 /* 640 * optimizations are made inside of devfsadm_rm_stale_links 641 * instead of before calling the function, as it always 642 * needs to add the valid link to the cache. 643 */ 644 devfsadm_rm_stale_links(stale_re, l_path, node, minor); 645 } 646 647 free(ctrl); 648 } 649 650 651 /* index of enumeration rule applicable to this module */ 652 #define RULE_INDEX 0 653 654 static char * 655 diskctrl(di_node_t node, di_minor_t minor) 656 { 657 char path[PATH_MAX + 1]; 658 char *devfspath; 659 char *buf, *mn; 660 boolean_t is_vhci; 661 662 devfsadm_enumerate_t rules[3] = { 663 {"^r?dsk$/^c([0-9]+)", 1, MATCH_PARENT}, 664 {"^cfg$/^c([0-9]+)$", 1, MATCH_ADDR}, 665 {"^scsi$/^.+$/^c([0-9]+)", 1, MATCH_PARENT} 666 }; 667 668 mn = di_minor_name(minor); 669 670 if ((devfspath = di_devfs_path(node)) == NULL) { 671 return (NULL); 672 } 673 (void) strcpy(path, devfspath); 674 (void) strcat(path, ":"); 675 (void) strcat(path, mn); 676 di_devfs_path_free(devfspath); 677 678 /* 679 * Use controller component of disk path 680 */ 681 is_vhci = (strncmp(path, "/scsi_vhci/", 11) == 0); 682 683 if (ctrl_enumerate_int(path, RULE_INDEX, &buf, rules, 3, 1, is_vhci) == 684 DEVFSADM_MULTIPLE) { 685 /* 686 * We failed because there are multiple logical controller 687 * numbers for a single physical controller. If we use node 688 * name also in the match it should fix this and only find one 689 * logical controller. (See 4045879). 690 * NOTE: Rules for controllers are not changed, as there is 691 * no unique controller number for them in this case. 692 * 693 * MATCH_UNCACHED flag is private to the "disks" and "sgen" 694 * modules. NOT to be used by other modules. 695 */ 696 697 rules[0].flags = MATCH_NODE | MATCH_UNCACHED; /* disks */ 698 rules[2].flags = MATCH_NODE | MATCH_UNCACHED; /* generic scsi */ 699 if (ctrl_enumerate_int(path, RULE_INDEX, &buf, rules, 3, 0, 700 is_vhci)) { 701 return (NULL); 702 } 703 } 704 705 return (buf); 706 } 707 708 typedef struct dvlist { 709 char *dv_link; 710 struct dvlist *dv_next; 711 } dvlist_t; 712 713 static void 714 free_dvlist(dvlist_t **pp) 715 { 716 dvlist_t *entry; 717 718 while (*pp) { 719 entry = *pp; 720 *pp = entry->dv_next; 721 assert(entry->dv_link); 722 free(entry->dv_link); 723 free(entry); 724 } 725 } 726 static int 727 dvlink_cb(di_devlink_t devlink, void *arg) 728 { 729 char *path; 730 char *can_path; 731 dvlist_t **pp = (dvlist_t **)arg; 732 dvlist_t *entry = NULL; 733 734 entry = calloc(1, sizeof (dvlist_t)); 735 if (entry == NULL) { 736 devfsadm_errprint("%s: calloc failed\n", modname); 737 goto error; 738 } 739 740 path = (char *)di_devlink_path(devlink); 741 assert(path); 742 if (path == NULL) { 743 devfsadm_errprint("%s: di_devlink_path() returned NULL\n", 744 modname); 745 goto error; 746 } 747 748 devfsadm_print(disk_mid, "%s: found link %s in reverse link cache\n", 749 modname, path); 750 751 /* 752 * Return linkname in canonical form i.e. without the 753 * "/dev/" prefix 754 */ 755 can_path = strstr(path, "/dev/"); 756 if (can_path == NULL) { 757 devfsadm_errprint("%s: devlink path %s has no /dev/\n", 758 modname, path); 759 goto error; 760 } 761 762 entry->dv_link = s_strdup(can_path + strlen("/dev/")); 763 entry->dv_next = *pp; 764 *pp = entry; 765 766 return (DI_WALK_CONTINUE); 767 768 error: 769 free(entry); 770 free_dvlist(pp); 771 *pp = NULL; 772 return (DI_WALK_TERMINATE); 773 } 774 775 /* 776 * Returns success only if all goes well. If there is no matching reserved link 777 * or if there is an error, we assume no match. It is better to err on the side 778 * of caution by creating extra links than to miss out creating a required link. 779 */ 780 static int 781 reserved_links_exist(di_node_t node, di_minor_t minor, int nflags) 782 { 783 di_devlink_handle_t dvlink_cache = devfsadm_devlink_cache(); 784 char phys_path[PATH_MAX]; 785 char *minor_path; 786 dvlist_t *head; 787 dvlist_t *entry; 788 char *s; 789 char l[PATH_MAX]; 790 int switch_link = 0; 791 char *mn = di_minor_name(minor); 792 793 if (dvlink_cache == NULL || mn == NULL) { 794 devfsadm_errprint("%s: No minor or devlink cache\n", modname); 795 return (DEVFSADM_FAILURE); 796 } 797 798 if (!devfsadm_have_reserved()) { 799 devfsadm_print(disk_mid, "%s: No reserved links\n", modname); 800 return (DEVFSADM_FAILURE); 801 } 802 803 minor_path = di_devfs_minor_path(minor); 804 if (minor_path == NULL) { 805 devfsadm_errprint("%s: di_devfs_minor_path failed\n", modname); 806 return (DEVFSADM_FAILURE); 807 } 808 809 (void) strlcpy(phys_path, minor_path, sizeof (phys_path)); 810 811 di_devfs_path_free(minor_path); 812 813 head = NULL; 814 (void) di_devlink_cache_walk(dvlink_cache, DISK_LINK_RE, phys_path, 815 DI_PRIMARY_LINK, &head, dvlink_cb); 816 817 /* 818 * We may be switching between EFI label and SMI label in which case 819 * we only have minors of the other type. 820 */ 821 if (head == NULL && (*mn == *(MN_SMI) || 822 (strncmp(mn, MN_EFI, 2) == 0))) { 823 devfsadm_print(disk_mid, "%s: No links for minor %s in /dev. " 824 "Trying another label\n", modname, mn); 825 s = strrchr(phys_path, ':'); 826 if (s == NULL) { 827 devfsadm_errprint("%s: invalid minor path: %s\n", 828 modname, phys_path); 829 return (DEVFSADM_FAILURE); 830 } 831 (void) snprintf(s+1, sizeof (phys_path) - (s + 1 - phys_path), 832 "%s%s", *mn == *(MN_SMI) ? MN_EFI : MN_SMI, 833 strstr(s, ",raw") ? ",raw" : ""); 834 (void) di_devlink_cache_walk(dvlink_cache, DISK_LINK_RE, 835 phys_path, DI_PRIMARY_LINK, &head, dvlink_cb); 836 } 837 838 if (head == NULL) { 839 devfsadm_print(disk_mid, "%s: minor %s has no links in /dev\n", 840 modname, phys_path); 841 /* no links on disk */ 842 return (DEVFSADM_FAILURE); 843 } 844 845 /* 846 * It suffices to use 1 link to this minor, since 847 * we are matching with reserved IDs on the basis of 848 * the controller number which will be the same for 849 * all links to this minor. 850 */ 851 if (!devfsadm_is_reserved(disks_re_array, head->dv_link)) { 852 /* not reserved links */ 853 devfsadm_print(disk_mid, "%s: devlink %s and its minor " 854 "are NOT reserved\n", modname, head->dv_link); 855 free_dvlist(&head); 856 return (DEVFSADM_FAILURE); 857 } 858 859 devfsadm_print(disk_mid, "%s: devlink %s and its minor are on " 860 "reserved list\n", modname, head->dv_link); 861 862 /* 863 * Switch between SMI and EFI labels if required 864 */ 865 switch_link = 0; 866 if (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0)) { 867 for (entry = head; entry; entry = entry->dv_next) { 868 s = strrchr(entry->dv_link, '/'); 869 assert(s); 870 if (s == NULL) { 871 devfsadm_errprint("%s: disk link %s has no " 872 "directory\n", modname, entry->dv_link); 873 continue; 874 } 875 if (*mn == *(MN_SMI) && strchr(s, 's') == NULL) { 876 (void) snprintf(l, sizeof (l), "%s%s", 877 entry->dv_link, SLICE_SMI); 878 switch_link = 1; 879 devfsadm_print(disk_mid, "%s: switching " 880 "reserved link from EFI to SMI label. " 881 "New link is %s\n", modname, l); 882 } else if (strncmp(mn, MN_EFI, 2) == 0 && 883 (s = strchr(s, 's'))) { 884 *s = '\0'; 885 (void) snprintf(l, sizeof (l), "%s", 886 entry->dv_link); 887 *s = 's'; 888 switch_link = 1; 889 devfsadm_print(disk_mid, "%s: switching " 890 "reserved link from SMI to EFI label. " 891 "New link is %s\n", modname, l); 892 } 893 if (switch_link) { 894 devfsadm_print(disk_mid, "%s: switching " 895 "link: deleting %s and creating %s\n", 896 modname, entry->dv_link, l); 897 devfsadm_rm_link(entry->dv_link); 898 (void) devfsadm_mklink(l, node, minor, nflags); 899 } 900 } 901 } 902 free_dvlist(&head); 903 904 /* 905 * return SUCCESS to indicate that new links to this minor should not 906 * be created so that only compatibility links to this minor remain. 907 */ 908 return (DEVFSADM_SUCCESS); 909 } 910