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 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26#include <devfsadm.h> 27#include <stdio.h> 28#include <strings.h> 29#include <stdlib.h> 30#include <limits.h> 31#include <ctype.h> 32#include <sys/int_fmtio.h> 33#include <sys/stat.h> 34#include <bsm/devalloc.h> 35#include <sys/scsi/scsi_address.h> 36#include <sys/libdevid.h> 37 38#define DISK_SUBPATH_MAX 100 39#define RM_STALE 0x01 40#define DISK_LINK_RE "^r?dsk/c[0-9]+(t[0-9A-F]+)?d[0-9]+(((s|p))[0-9]+)?$" 41#define DISK_LINK_TO_UPPER(ch)\ 42 (((ch) >= 'a' && (ch) <= 'z') ? (ch - 'a' + 'A') : ch) 43 44#define SLICE_SMI "s7" 45#define SLICE_EFI "" 46 47#define MN_SMI "h" 48#define MN_EFI "wd" 49#define ASCIIWWNSIZE 255 50#if defined(__i386) || defined(__amd64) 51/* 52 * The number of minor nodes per LUN is defined by the disk drivers. 53 * Currently it is set to 64. Refer CMLBUNIT_SHIFT (cmlb_impl.h) 54 */ 55#define NUM_MINORS_PER_INSTANCE 64 56#endif 57 58 59extern int system_labeled; 60 61static int disk_callback_chan(di_minor_t minor, di_node_t node); 62static int disk_callback_nchan(di_minor_t minor, di_node_t node); 63static int disk_callback_wwn(di_minor_t minor, di_node_t node); 64static int disk_callback_xvmd(di_minor_t minor, di_node_t node); 65static int disk_callback_fabric(di_minor_t minor, di_node_t node); 66static int disk_callback_sas(di_minor_t minor, di_node_t node); 67static void disk_common(di_minor_t minor, di_node_t node, char *disk, 68 int flags); 69static char *diskctrl(di_node_t node, di_minor_t minor); 70static int reserved_links_exist(di_node_t node, di_minor_t minor, int nflags); 71 72 73static devfsadm_create_t disk_cbt[] = { 74 { "disk", DDI_NT_BLOCK, NULL, 75 TYPE_EXACT, ILEVEL_0, disk_callback_nchan 76 }, 77 { "disk", DDI_NT_BLOCK_CHAN, NULL, 78 TYPE_EXACT, ILEVEL_0, disk_callback_chan 79 }, 80 { "disk", DDI_NT_BLOCK_FABRIC, NULL, 81 TYPE_EXACT, ILEVEL_0, disk_callback_fabric 82 }, 83 { "disk", DDI_NT_BLOCK_WWN, NULL, 84 TYPE_EXACT, ILEVEL_0, disk_callback_wwn 85 }, 86 { "disk", DDI_NT_BLOCK_SAS, NULL, 87 TYPE_EXACT, ILEVEL_0, disk_callback_sas 88 }, 89 { "disk", DDI_NT_CD, NULL, 90 TYPE_EXACT, ILEVEL_0, disk_callback_nchan 91 }, 92 { "disk", DDI_NT_CD_CHAN, NULL, 93 TYPE_EXACT, ILEVEL_0, disk_callback_chan 94 }, 95 { "disk", DDI_NT_BLOCK_XVMD, NULL, 96 TYPE_EXACT, ILEVEL_0, disk_callback_xvmd 97 }, 98 { "disk", DDI_NT_CD_XVMD, NULL, 99 TYPE_EXACT, ILEVEL_0, disk_callback_xvmd 100 }, 101}; 102 103DEVFSADM_CREATE_INIT_V0(disk_cbt); 104 105/* 106 * HOT auto cleanup of disks not desired. 107 */ 108static devfsadm_remove_t disk_remove_cbt[] = { 109 { "disk", DISK_LINK_RE, RM_POST, 110 ILEVEL_0, devfsadm_rm_all 111 } 112}; 113 114DEVFSADM_REMOVE_INIT_V0(disk_remove_cbt); 115 116static devlink_re_t disks_re_array[] = { 117 {"^r?dsk/c([0-9]+)", 1}, 118 {"^cfg/c([0-9]+)$", 1}, 119 {"^scsi/.+/c([0-9]+)", 1}, 120 {NULL} 121}; 122 123static char *disk_mid = "disk_mid"; 124static char *modname = "disk_link"; 125 126int 127minor_init() 128{ 129 devfsadm_print(disk_mid, 130 "%s: minor_init(): Creating disks reserved ID cache\n", 131 modname); 132 return (devfsadm_reserve_id_cache(disks_re_array, NULL)); 133} 134 135static int 136disk_callback_chan(di_minor_t minor, di_node_t node) 137{ 138 char *addr; 139 char disk[20]; 140 uint_t targ; 141 uint_t lun; 142 143 addr = di_bus_addr(node); 144 (void) sscanf(addr, "%X,%X", &targ, &lun); 145 (void) sprintf(disk, "t%dd%d", targ, lun); 146 disk_common(minor, node, disk, 0); 147 return (DEVFSADM_CONTINUE); 148 149} 150 151static int 152disk_callback_nchan(di_minor_t minor, di_node_t node) 153{ 154 char *addr; 155 char disk[10]; 156 uint_t lun; 157 158 addr = di_bus_addr(node); 159 (void) sscanf(addr, "%X", &lun); 160 (void) sprintf(disk, "d%d", lun); 161 disk_common(minor, node, disk, 0); 162 return (DEVFSADM_CONTINUE); 163 164} 165 166static int 167disk_callback_wwn(di_minor_t minor, di_node_t node) 168{ 169 char disk[10]; 170 int lun; 171 int targ; 172 int *intp; 173 174 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, SCSI_ADDR_PROP_TARGET, 175 &intp) <= 0) { 176 return (DEVFSADM_CONTINUE); 177 } 178 targ = *intp; 179 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, SCSI_ADDR_PROP_LUN, 180 &intp) <= 0) { 181 lun = 0; 182 } else { 183 lun = *intp; 184 } 185 (void) sprintf(disk, "t%dd%d", targ, lun); 186 187 disk_common(minor, node, disk, RM_STALE); 188 189 return (DEVFSADM_CONTINUE); 190} 191 192static int 193disk_callback_fabric(di_minor_t minor, di_node_t node) 194{ 195 char disk[DISK_SUBPATH_MAX]; 196 int lun; 197 int count; 198 int *intp; 199 uchar_t *str; 200 uchar_t *wwn; 201 uchar_t ascii_wwn[ASCIIWWNSIZE]; 202 203 if (di_prop_lookup_strings(DDI_DEV_T_ANY, node, 204 "client-guid", (char **)&wwn) > 0) { 205 if (strlcpy((char *)ascii_wwn, (char *)wwn, 206 sizeof (ascii_wwn)) >= sizeof (ascii_wwn)) { 207 devfsadm_errprint("SUNW_disk_link: GUID too long:%d", 208 strlen((char *)wwn)); 209 return (DEVFSADM_CONTINUE); 210 } 211 lun = 0; 212 } else if (di_prop_lookup_bytes(DDI_DEV_T_ANY, node, 213 "port-wwn", &wwn) > 0) { 214 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 215 SCSI_ADDR_PROP_LUN, &intp) > 0) { 216 lun = *intp; 217 } else { 218 lun = 0; 219 } 220 221 for (count = 0, str = ascii_wwn; count < 8; count++, str += 2) { 222 (void) sprintf((caddr_t)str, "%02x", wwn[count]); 223 } 224 *str = '\0'; 225 } else { 226 return (DEVFSADM_CONTINUE); 227 } 228 229 for (str = ascii_wwn; *str != '\0'; str++) { 230 *str = DISK_LINK_TO_UPPER(*str); 231 } 232 233 (void) snprintf(disk, DISK_SUBPATH_MAX, "t%sd%d", ascii_wwn, lun); 234 235 disk_common(minor, node, disk, RM_STALE); 236 237 return (DEVFSADM_CONTINUE); 238} 239 240static int 241disk_callback_sas(di_minor_t minor, di_node_t node) 242{ 243 char disk[DISK_SUBPATH_MAX]; 244 int lun64_found = 0; 245 scsi_lun64_t lun64, sl; 246 scsi_lun_t lun; 247 int64_t *lun64p; 248 uint64_t wwn; 249 int *intp; 250 char *tgt_port; 251 uchar_t addr_method; 252 253 /* Get lun property */ 254 if (di_prop_lookup_int64(DDI_DEV_T_ANY, node, 255 SCSI_ADDR_PROP_LUN64, &lun64p) > 0) { 256 if (*lun64p != SCSI_LUN64_ILLEGAL) { 257 lun64_found = 1; 258 lun64 = (uint64_t)*lun64p; 259 } 260 } 261 if ((!lun64_found) && (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 262 SCSI_ADDR_PROP_LUN, &intp) > 0)) { 263 lun64 = (uint64_t)*intp; 264 } 265 266 lun = scsi_lun64_to_lun(lun64); 267 268 addr_method = (lun.sl_lun1_msb & SCSI_LUN_AM_MASK); 269 270 if (di_prop_lookup_strings(DDI_DEV_T_ANY, node, 271 SCSI_ADDR_PROP_TARGET_PORT, &tgt_port) > 0) { 272 (void) scsi_wwnstr_to_wwn(tgt_port, &wwn); 273 if ((addr_method == SCSI_LUN_AM_PDEV) && 274 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) && 275 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) && 276 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) { 277 (void) snprintf(disk, DISK_SUBPATH_MAX, 278 "t%"PRIX64"d%"PRId64, wwn, lun64); 279 } else if ((addr_method == SCSI_LUN_AM_FLAT) && 280 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) && 281 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) && 282 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) { 283 sl = (lun.sl_lun1_msb << 8) | lun.sl_lun1_lsb; 284 (void) snprintf(disk, DISK_SUBPATH_MAX, 285 "t%"PRIX64"d%"PRIX16, wwn, sl); 286 } else { 287 (void) snprintf(disk, DISK_SUBPATH_MAX, 288 "t%"PRIX64"d%"PRIX64, wwn, lun64); 289 } 290 } else if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, 291 SCSI_ADDR_PROP_SATA_PHY, &intp) > 0) { 292 /* Use phy format naming, for SATA devices without wwn */ 293 if ((addr_method == SCSI_LUN_AM_PDEV) && 294 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) && 295 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) && 296 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) { 297 (void) snprintf(disk, DISK_SUBPATH_MAX, 298 "t%dd%"PRId64, *intp, lun64); 299 } else if ((addr_method == SCSI_LUN_AM_FLAT) && 300 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) && 301 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) && 302 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) { 303 sl = (lun.sl_lun1_msb << 8) | lun.sl_lun1_lsb; 304 (void) snprintf(disk, DISK_SUBPATH_MAX, 305 "t%dd%"PRIX16, *intp, sl); 306 } else { 307 (void) snprintf(disk, DISK_SUBPATH_MAX, 308 "t%dd%"PRIX64, *intp, lun64); 309 } 310 } else { 311 return (DEVFSADM_CONTINUE); 312 } 313 314 disk_common(minor, node, disk, RM_STALE); 315 316 return (DEVFSADM_CONTINUE); 317} 318 319/* 320 * xVM virtual block device 321 * 322 * VBDs are enumerated into xenstore by xend and named using 323 * the linux dev_t values for 'hd' and 'xvd' devices. Linux 324 * dev_t's are 16-bit values. The upper 8 bits identify the major # 325 * of the device (hd, xvd) and the lower 8 bits the instance and partition 326 * 327 * For PV guests, VBDs are named by the virt-tools using 328 * the form xvd[a-p][1-15]. The corresponding Solaris /dev/dsk name 329 * created by this generator will be c0t[0-15]d[0-15]sN, 330 * were the target (t) value represents [a-p] and the 331 * disk (d) value is either 0 (e.g. xvda) or contains the partition 332 * information if it has been specified [1-15] (e.g. xvda1) 333 * 334 * For PV guests using the legacy naming (0, 1, 2, ...) 335 * the Solaris disk names created will be c0d[0..767]sN 336 * The Solaris version of virt-install based on virtinst.101 337 * named PV disks as sequential integers. With virtinst.300_1 and 338 * beyond, the virt-* tools will no longer create legacy disk 339 * names. 340 */ 341static int 342disk_callback_xvmd(di_minor_t minor, di_node_t node) 343{ 344#define HD_BASE (3 << 8) 345#define XVBDMAJ 202 346 347 char *addr; 348 char disk[16]; 349 uint_t targ; 350 uint_t lun = 0; 351 uint_t fmaj; 352 353 addr = di_bus_addr(node); 354 targ = strtol(addr, (char **)NULL, 10); 355 fmaj = targ >> 8; 356 357 /* legacy device address */ 358 if (targ < HD_BASE) 359 (void) snprintf(disk, sizeof (disk), "d%d", targ); 360 /* PV VBD */ 361 else if (fmaj == XVBDMAJ) { 362 lun = targ & 0xf; 363 targ = (targ & 0xff) >> 4; 364 (void) snprintf(disk, sizeof (disk), "t%dd%d", targ, lun); 365 /* HVM device names are generated using the standard generator */ 366 } else { 367 devfsadm_errprint("%s: invalid disk device number (%s)\n", 368 modname, addr); 369 return (DEVFSADM_CONTINUE); 370 } 371 disk_common(minor, node, disk, 0); 372 return (DEVFSADM_CONTINUE); 373 374} 375 376/* 377 * This function is called for every disk minor node. 378 * Calls enumerate to assign a logical controller number, and 379 * then devfsadm_mklink to make the link. 380 */ 381static void 382disk_common(di_minor_t minor, di_node_t node, char *disk, int flags) 383{ 384 char l_path[PATH_MAX + 1]; 385 char sec_path[PATH_MAX + 1]; 386 char stale_re[DISK_SUBPATH_MAX]; 387 char *dir; 388 char slice[4]; 389 char *mn; 390 char *ctrl; 391 char *nt = NULL; 392 int *int_prop; 393 int nflags = 0; 394#if defined(__i386) || defined(__amd64) 395 char mn_copy[4]; 396 char *part; 397 int part_num; 398#endif 399 400 mn = di_minor_name(minor); 401 if (strstr(mn, ",raw")) { 402 dir = "rdsk"; 403#if defined(__i386) || defined(__amd64) 404 (void) strncpy(mn_copy, mn, 4); 405 part = strtok(mn_copy, ","); 406#endif 407 } else { 408 dir = "dsk"; 409#if defined(__i386) || defined(__amd64) 410 part = mn; 411#endif 412 } 413 414#if defined(__i386) || defined(__amd64) 415 /* 416 * The following is a table describing the allocation of 417 * minor numbers, minor names and /dev/dsk names for partitions 418 * and slices on x86 systems. 419 * 420 * Minor Number Minor Name /dev/dsk name 421 * --------------------------------------------- 422 * 0 to 15 "a" to "p" s0 to s15 423 * 16 "q" p0 424 * 17 to 20 "r" to "u" p1 to p4 425 * 21 to 52 "p5" to "p36" p5 to p36 426 * 427 */ 428 part_num = atoi(part + 1); 429 430 if ((mn[0] == 'p') && (part_num >= 5)) { 431 /* logical drive */ 432 (void) snprintf(slice, 4, "%s", part); 433 } else { 434#endif 435 if (mn[0] < 'q') { 436 (void) sprintf(slice, "s%d", mn[0] - 'a'); 437 } else if (strncmp(mn, MN_EFI, 2) != 0) { 438 (void) sprintf(slice, "p%d", mn[0] - 'q'); 439 } else { 440 /* For EFI label */ 441 (void) sprintf(slice, SLICE_EFI); 442 } 443#if defined(__i386) || defined(__amd64) 444 } 445#endif 446 447 nflags = 0; 448 if (system_labeled) { 449 nt = di_minor_nodetype(minor); 450 if ((nt != NULL) && 451 ((strcmp(nt, DDI_NT_CD) == 0) || 452 (strcmp(nt, DDI_NT_CD_CHAN) == 0) || 453 (strcmp(nt, DDI_NT_BLOCK_CHAN) == 0))) { 454 nflags = DA_ADD|DA_CD; 455 } 456 } 457 458 if (reserved_links_exist(node, minor, nflags) == DEVFSADM_SUCCESS) { 459 devfsadm_print(disk_mid, "Reserved link exists. Not " 460 "creating links for slice %s\n", slice); 461 return; 462 } 463 464 if (NULL == (ctrl = diskctrl(node, minor))) 465 return; 466 467 (void) strcpy(l_path, dir); 468 (void) strcat(l_path, "/c"); 469 (void) strcat(l_path, ctrl); 470 (void) strcat(l_path, disk); 471 472 /* 473 * If switching between SMI and EFI label or vice versa 474 * cleanup the previous label's devlinks. 475 */ 476 if (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0)) { 477 char *s, tpath[PATH_MAX + 1]; 478 struct stat sb; 479 480 s = l_path + strlen(l_path); 481 (void) strcat(l_path, (*mn == *(MN_SMI)) 482 ? SLICE_EFI : SLICE_SMI); 483 /* 484 * Attempt the remove only if the stale link exists 485 */ 486 (void) snprintf(tpath, sizeof (tpath), "%s/dev/%s", 487 devfsadm_root_path(), l_path); 488 if (lstat(tpath, &sb) != -1) 489 devfsadm_rm_all(l_path); 490 *s = '\0'; 491 } 492 (void) strcat(l_path, slice); 493 494 (void) devfsadm_mklink(l_path, node, minor, nflags); 495 496 /* secondary links for removable and hotpluggable devices */ 497 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "removable-media", 498 &int_prop) >= 0) { 499 (void) strcpy(sec_path, "removable-media/"); 500 (void) strcat(sec_path, l_path); 501 (void) devfsadm_secondary_link(sec_path, l_path, 0); 502 } 503 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, "hotpluggable", 504 &int_prop) >= 0) { 505 (void) strcpy(sec_path, "hotpluggable/"); 506 (void) strcat(sec_path, l_path); 507 (void) devfsadm_secondary_link(sec_path, l_path, 0); 508 } 509 510 if ((flags & RM_STALE) == RM_STALE) { 511 (void) strcpy(stale_re, "^"); 512 (void) strcat(stale_re, dir); 513 (void) strcat(stale_re, "/c"); 514 (void) strcat(stale_re, ctrl); 515 (void) strcat(stale_re, "t[0-9A-F]+d[0-9]+(s[0-9]+)?$"); 516 /* 517 * optimizations are made inside of devfsadm_rm_stale_links 518 * instead of before calling the function, as it always 519 * needs to add the valid link to the cache. 520 */ 521 devfsadm_rm_stale_links(stale_re, l_path, node, minor); 522 } 523 524 free(ctrl); 525} 526 527 528/* index of enumeration rule applicable to this module */ 529#define RULE_INDEX 0 530 531static char * 532diskctrl(di_node_t node, di_minor_t minor) 533{ 534 char path[PATH_MAX + 1]; 535 char *devfspath; 536 char *buf, *mn; 537 538 devfsadm_enumerate_t rules[3] = { 539 {"^r?dsk$/^c([0-9]+)", 1, MATCH_PARENT}, 540 {"^cfg$/^c([0-9]+)$", 1, MATCH_ADDR}, 541 {"^scsi$/^.+$/^c([0-9]+)", 1, MATCH_PARENT} 542 }; 543 544 mn = di_minor_name(minor); 545 546 if ((devfspath = di_devfs_path(node)) == NULL) { 547 return (NULL); 548 } 549 (void) strcpy(path, devfspath); 550 (void) strcat(path, ":"); 551 (void) strcat(path, mn); 552 di_devfs_path_free(devfspath); 553 554 /* 555 * Use controller component of disk path 556 */ 557 if (disk_enumerate_int(path, RULE_INDEX, &buf, rules, 3) == 558 DEVFSADM_MULTIPLE) { 559 560 /* 561 * We failed because there are multiple logical controller 562 * numbers for a single physical controller. If we use node 563 * name also in the match it should fix this and only find one 564 * logical controller. (See 4045879). 565 * NOTE: Rules for controllers are not changed, as there is 566 * no unique controller number for them in this case. 567 * 568 * MATCH_UNCACHED flag is private to the "disks" and "sgen" 569 * modules. NOT to be used by other modules. 570 */ 571 572 rules[0].flags = MATCH_NODE | MATCH_UNCACHED; /* disks */ 573 rules[2].flags = MATCH_NODE | MATCH_UNCACHED; /* generic scsi */ 574 if (devfsadm_enumerate_int(path, RULE_INDEX, &buf, rules, 3)) { 575 return (NULL); 576 } 577 } 578 579 return (buf); 580} 581 582typedef struct dvlist { 583 char *dv_link; 584 struct dvlist *dv_next; 585} dvlist_t; 586 587static void 588free_dvlist(dvlist_t **pp) 589{ 590 dvlist_t *entry; 591 592 while (*pp) { 593 entry = *pp; 594 *pp = entry->dv_next; 595 assert(entry->dv_link); 596 free(entry->dv_link); 597 free(entry); 598 } 599} 600static int 601dvlink_cb(di_devlink_t devlink, void *arg) 602{ 603 char *path; 604 char *can_path; 605 dvlist_t **pp = (dvlist_t **)arg; 606 dvlist_t *entry = NULL; 607 608 entry = calloc(1, sizeof (dvlist_t)); 609 if (entry == NULL) { 610 devfsadm_errprint("%s: calloc failed\n", modname); 611 goto error; 612 } 613 614 path = (char *)di_devlink_path(devlink); 615 assert(path); 616 if (path == NULL) { 617 devfsadm_errprint("%s: di_devlink_path() returned NULL\n", 618 modname); 619 goto error; 620 } 621 622 devfsadm_print(disk_mid, "%s: found link %s in reverse link cache\n", 623 modname, path); 624 625 /* 626 * Return linkname in canonical form i.e. without the 627 * "/dev/" prefix 628 */ 629 can_path = strstr(path, "/dev/"); 630 if (can_path == NULL) { 631 devfsadm_errprint("%s: devlink path %s has no /dev/\n", 632 modname, path); 633 goto error; 634 } 635 636 entry->dv_link = s_strdup(can_path + strlen("/dev/")); 637 entry->dv_next = *pp; 638 *pp = entry; 639 640 return (DI_WALK_CONTINUE); 641 642error: 643 free(entry); 644 free_dvlist(pp); 645 *pp = NULL; 646 return (DI_WALK_TERMINATE); 647} 648 649/* 650 * Returns success only if all goes well. If there is no matching reserved link 651 * or if there is an error, we assume no match. It is better to err on the side 652 * of caution by creating extra links than to miss out creating a required link. 653 */ 654static int 655reserved_links_exist(di_node_t node, di_minor_t minor, int nflags) 656{ 657 di_devlink_handle_t dvlink_cache = devfsadm_devlink_cache(); 658 char phys_path[PATH_MAX]; 659 char *minor_path; 660 dvlist_t *head; 661 dvlist_t *entry; 662 char *s; 663 char l[PATH_MAX]; 664 int switch_link = 0; 665 char *mn = di_minor_name(minor); 666 667 if (dvlink_cache == NULL || mn == NULL) { 668 devfsadm_errprint("%s: No minor or devlink cache\n", modname); 669 return (DEVFSADM_FAILURE); 670 } 671 672 if (!devfsadm_have_reserved()) { 673 devfsadm_print(disk_mid, "%s: No reserved links\n", modname); 674 return (DEVFSADM_FAILURE); 675 } 676 677 minor_path = di_devfs_minor_path(minor); 678 if (minor_path == NULL) { 679 devfsadm_errprint("%s: di_devfs_minor_path failed\n", modname); 680 return (DEVFSADM_FAILURE); 681 } 682 683 (void) strlcpy(phys_path, minor_path, sizeof (phys_path)); 684 685 di_devfs_path_free(minor_path); 686 687 head = NULL; 688 (void) di_devlink_cache_walk(dvlink_cache, DISK_LINK_RE, phys_path, 689 DI_PRIMARY_LINK, &head, dvlink_cb); 690 691 /* 692 * We may be switching between EFI label and SMI label in which case 693 * we only have minors of the other type. 694 */ 695 if (head == NULL && (*mn == *(MN_SMI) || 696 (strncmp(mn, MN_EFI, 2) == 0))) { 697 devfsadm_print(disk_mid, "%s: No links for minor %s in /dev. " 698 "Trying another label\n", modname, mn); 699 s = strrchr(phys_path, ':'); 700 if (s == NULL) { 701 devfsadm_errprint("%s: invalid minor path: %s\n", 702 modname, phys_path); 703 return (DEVFSADM_FAILURE); 704 } 705 (void) snprintf(s+1, sizeof (phys_path) - (s + 1 - phys_path), 706 "%s%s", *mn == *(MN_SMI) ? MN_EFI : MN_SMI, 707 strstr(s, ",raw") ? ",raw" : ""); 708 (void) di_devlink_cache_walk(dvlink_cache, DISK_LINK_RE, 709 phys_path, DI_PRIMARY_LINK, &head, dvlink_cb); 710 } 711 712 if (head == NULL) { 713 devfsadm_print(disk_mid, "%s: minor %s has no links in /dev\n", 714 modname, phys_path); 715 /* no links on disk */ 716 return (DEVFSADM_FAILURE); 717 } 718 719 /* 720 * It suffices to use 1 link to this minor, since 721 * we are matching with reserved IDs on the basis of 722 * the controller number which will be the same for 723 * all links to this minor. 724 */ 725 if (!devfsadm_is_reserved(disks_re_array, head->dv_link)) { 726 /* not reserved links */ 727 devfsadm_print(disk_mid, "%s: devlink %s and its minor " 728 "are NOT reserved\n", modname, head->dv_link); 729 free_dvlist(&head); 730 return (DEVFSADM_FAILURE); 731 } 732 733 devfsadm_print(disk_mid, "%s: devlink %s and its minor are on " 734 "reserved list\n", modname, head->dv_link); 735 736 /* 737 * Switch between SMI and EFI labels if required 738 */ 739 switch_link = 0; 740 if (*mn == *(MN_SMI) || (strncmp(mn, MN_EFI, 2) == 0)) { 741 for (entry = head; entry; entry = entry->dv_next) { 742 s = strrchr(entry->dv_link, '/'); 743 assert(s); 744 if (s == NULL) { 745 devfsadm_errprint("%s: disk link %s has no " 746 "directory\n", modname, entry->dv_link); 747 continue; 748 } 749 if (*mn == *(MN_SMI) && strchr(s, 's') == NULL) { 750 (void) snprintf(l, sizeof (l), "%s%s", 751 entry->dv_link, SLICE_SMI); 752 switch_link = 1; 753 devfsadm_print(disk_mid, "%s: switching " 754 "reserved link from EFI to SMI label. " 755 "New link is %s\n", modname, l); 756 } else if (strncmp(mn, MN_EFI, 2) == 0 && 757 (s = strchr(s, 's'))) { 758 *s = '\0'; 759 (void) snprintf(l, sizeof (l), "%s", 760 entry->dv_link); 761 *s = 's'; 762 switch_link = 1; 763 devfsadm_print(disk_mid, "%s: switching " 764 "reserved link from SMI to EFI label. " 765 "New link is %s\n", modname, l); 766 } 767 if (switch_link) { 768 devfsadm_print(disk_mid, "%s: switching " 769 "link: deleting %s and creating %s\n", 770 modname, entry->dv_link, l); 771 devfsadm_rm_link(entry->dv_link); 772 (void) devfsadm_mklink(l, node, minor, nflags); 773 } 774 } 775 } 776 free_dvlist(&head); 777 778 /* 779 * return SUCCESS to indicate that new links to this minor should not 780 * be created so that only compatibility links to this minor remain. 781 */ 782 return (DEVFSADM_SUCCESS); 783} 784