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8322 nl: misleading-indentation
[unleashed/tickless.git] / usr / src / cmd / devfsadm / disk_link.c
blobc68cba8bea48e565d875d553de709cfb8bba24ff
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 2016 Toomas Soome <tsoome@me.com>
23 * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
24 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 */
27
28 #include <devfsadm.h>
29 #include <stdio.h>
30 #include <strings.h>
31 #include <stdlib.h>
32 #include <limits.h>
33 #include <ctype.h>
34 #include <unistd.h>
35 #include <sys/int_fmtio.h>
36 #include <sys/stat.h>
37 #include <bsm/devalloc.h>
38 #include <sys/scsi/scsi_address.h>
39 #include <sys/libdevid.h>
40 #include <sys/lofi.h>
41
42 #define DISK_SUBPATH_MAX 100
43 #define RM_STALE 0x01
44 #define DISK_LINK_RE "^r?dsk/c[0-9]+(t[0-9A-F]+)?d[0-9]+(((s|p))[0-9]+)?$"
45 #define DISK_LINK_TO_UPPER(ch)\
46 (((ch) >= 'a' && (ch) <= 'z') ? (ch - 'a' + 'A') : ch)
47
48 #define SLICE_SMI "s7"
49 #define SLICE_EFI ""
50
51 #define MN_SMI "h"
52 #define MN_EFI "wd"
53 #define ASCIIWWNSIZE 255
54 #if defined(__i386) || defined(__amd64)
55 /*
56 * The number of minor nodes per LUN is defined by the disk drivers.
57 * Currently it is set to 64. Refer CMLBUNIT_SHIFT (cmlb_impl.h)
58 */
59 #define NUM_MINORS_PER_INSTANCE 64
60 #endif
61
62
63 extern int system_labeled;
64
65 static int disk_callback_chan(di_minor_t minor, di_node_t node);
66 static int disk_callback_nchan(di_minor_t minor, di_node_t node);
67 static int disk_callback_blkdev(di_minor_t minor, di_node_t node);
68 static int disk_callback_wwn(di_minor_t minor, di_node_t node);
69 static int disk_callback_xvmd(di_minor_t minor, di_node_t node);
70 static int disk_callback_fabric(di_minor_t minor, di_node_t node);
71 static int disk_callback_sas(di_minor_t minor, di_node_t node);
72 static void disk_common(di_minor_t minor, di_node_t node, char *disk,
73 int flags);
74 static char *diskctrl(di_node_t node, di_minor_t minor);
75 static int reserved_links_exist(di_node_t node, di_minor_t minor, int nflags);
76 static void disk_rm_lofi_all(char *file);
77
78
79 static devfsadm_create_t disk_cbt[] = {
80 { "disk", DDI_NT_BLOCK, NULL,
81 TYPE_EXACT, ILEVEL_0, disk_callback_nchan
82 },
83 { "disk", DDI_NT_BLOCK_CHAN, NULL,
84 TYPE_EXACT, ILEVEL_0, disk_callback_chan
85 },
86 { "disk", DDI_NT_BLOCK_BLKDEV, NULL,
87 TYPE_EXACT, ILEVEL_0, disk_callback_blkdev
88 },
89 { "disk", DDI_NT_BLOCK_FABRIC, NULL,
90 TYPE_EXACT, ILEVEL_0, disk_callback_fabric
91 },
92 { "disk", DDI_NT_BLOCK_WWN, NULL,
93 TYPE_EXACT, ILEVEL_0, disk_callback_wwn
94 },
95 { "disk", DDI_NT_BLOCK_SAS, NULL,
96 TYPE_EXACT, ILEVEL_0, disk_callback_sas
97 },
98 { "disk", DDI_NT_CD, NULL,
99 TYPE_EXACT, ILEVEL_0, disk_callback_nchan
100 },
101 { "disk", DDI_NT_CD_CHAN, NULL,
102 TYPE_EXACT, ILEVEL_0, disk_callback_chan
103 },
104 { "disk", DDI_NT_BLOCK_XVMD, NULL,
105 TYPE_EXACT, ILEVEL_0, disk_callback_xvmd
106 },
107 { "disk", DDI_NT_CD_XVMD, NULL,
108 TYPE_EXACT, ILEVEL_0, disk_callback_xvmd
109 },
110 };
111
112 DEVFSADM_CREATE_INIT_V0(disk_cbt);
113
114 /*
115 * HOT auto cleanup of disks is done for lofi devices only.
116 */
117 static devfsadm_remove_t disk_remove_cbt[] = {
118 { "disk", DISK_LINK_RE, RM_HOT | RM_POST | RM_ALWAYS,
119 ILEVEL_0, disk_rm_lofi_all
120 },
121 { "disk", DISK_LINK_RE, RM_POST,
122 ILEVEL_0, devfsadm_rm_all
123 }
124 };
125
126 DEVFSADM_REMOVE_INIT_V0(disk_remove_cbt);
127
128 static devlink_re_t disks_re_array[] = {
129 {"^r?dsk/c([0-9]+)", 1},
130 {"^cfg/c([0-9]+)$", 1},
131 {"^scsi/.+/c([0-9]+)", 1},
132 {NULL}
133 };
134
135 static char *disk_mid = "disk_mid";
136 static char *modname = "disk_link";
137
138 /*
139 * Check if link is from lofi by checking path from readlink().
140 */
141 static int
142 is_lofi_disk(char *file)
143 {
144 char buf[PATH_MAX + 1];
145 char filepath[PATH_MAX];
146 char *ptr;
147 ssize_t size;
148
149 size = snprintf(filepath, sizeof (filepath), "%s/dev/%s",
150 devfsadm_root_path(), file);
151 if (size > sizeof (filepath))
152 return (0);
153
154 size = readlink(filepath, buf, sizeof (buf) - 1);
155 if (size == -1)
156 return (0);
157 buf[size] = '\0';
158 ptr = strchr(buf, '@');
159 if (ptr == NULL)
160 return (0);
161 ptr[1] = '\0';
162 if (strcmp(buf, "../../devices/pseudo/lofi@") != 0)
163 return (0);
164 return (1);
165 }
166
167 /*
168 * Wrapper around devfsadm_rm_link() for lofi devices.
169 */
170 static void disk_rm_lofi_all(char *file)
171 {
172 if (is_lofi_disk(file))
173 devfsadm_rm_link(file);
174 }
175
176 int
177 minor_init()
178 {
179 devfsadm_print(disk_mid,
180 "%s: minor_init(): Creating disks reserved ID cache\n",
181 modname);
182 return (devfsadm_reserve_id_cache(disks_re_array, NULL));
183 }
184
185 static int
186 disk_callback_chan(di_minor_t minor, di_node_t node)
187 {
188 char *addr;
189 char disk[23];
190 char *driver;
191 uint_t targ = 0;
192 uint_t lun = 0;
193
194 driver = di_driver_name(node);
195 if (strcmp(driver, LOFI_DRIVER_NAME) != 0) {
196 addr = di_bus_addr(node);
197 (void) sscanf(addr, "%X,%X", &targ, &lun);
198 } else {
199 targ = di_instance(node);
200 }
201
202 (void) snprintf(disk, sizeof (disk), "t%dd%d", targ, lun);
203 disk_common(minor, node, disk, 0);
204 return (DEVFSADM_CONTINUE);
205
206 }
207
208 static int
209 disk_callback_nchan(di_minor_t minor, di_node_t node)
210 {
211 char *addr;
212 char disk[10];
213 uint_t lun;
214
215 addr = di_bus_addr(node);
216 (void) sscanf(addr, "%X", &lun);
217 (void) sprintf(disk, "d%d", lun);
218 disk_common(minor, node, disk, 0);
219 return (DEVFSADM_CONTINUE);
220
221 }
222
223 static int
224 disk_callback_blkdev(di_minor_t minor, di_node_t node)
225 {
226 char *addr;
227 char disk[DISK_SUBPATH_MAX];
228 uint64_t eui64;
229 uint_t lun = 0;
230
231 addr = di_bus_addr(node);
232 (void) sscanf(addr, "w%016"PRIx64",%X", &eui64, &lun);
233 (void) snprintf(disk, DISK_SUBPATH_MAX, "t%016"PRIX64"d%d", eui64, lun);
234 disk_common(minor, node, disk, RM_STALE);
235 return (DEVFSADM_CONTINUE);
236 }
237
238 static int
239 disk_callback_wwn(di_minor_t minor, di_node_t node)
240 {
241 char disk[10];
242 int lun;
243 int targ;
244 int *intp;
245
246 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, SCSI_ADDR_PROP_TARGET,
247 &intp) <= 0) {
248 return (DEVFSADM_CONTINUE);
249 }
250 targ = *intp;
251 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node, SCSI_ADDR_PROP_LUN,
252 &intp) <= 0) {
253 lun = 0;
254 } else {
255 lun = *intp;
256 }
257 (void) sprintf(disk, "t%dd%d", targ, lun);
258
259 disk_common(minor, node, disk, RM_STALE);
260
261 return (DEVFSADM_CONTINUE);
262 }
263
264 static int
265 disk_callback_fabric(di_minor_t minor, di_node_t node)
266 {
267 char disk[DISK_SUBPATH_MAX];
268 int lun;
269 int count;
270 int *intp;
271 uchar_t *str;
272 uchar_t *wwn;
273 uchar_t ascii_wwn[ASCIIWWNSIZE];
274
275 if (di_prop_lookup_strings(DDI_DEV_T_ANY, node,
276 "client-guid", (char **)&wwn) > 0) {
277 if (strlcpy((char *)ascii_wwn, (char *)wwn,
278 sizeof (ascii_wwn)) >= sizeof (ascii_wwn)) {
279 devfsadm_errprint("SUNW_disk_link: GUID too long:%d",
280 strlen((char *)wwn));
281 return (DEVFSADM_CONTINUE);
282 }
283 lun = 0;
284 } else if (di_prop_lookup_bytes(DDI_DEV_T_ANY, node,
285 "port-wwn", &wwn) > 0) {
286 if (di_prop_lookup_ints(DDI_DEV_T_ANY, node,
287 SCSI_ADDR_PROP_LUN, &intp) > 0) {
288 lun = *intp;
289 } else {
290 lun = 0;
291 }
292
293 for (count = 0, str = ascii_wwn; count < 8; count++, str += 2) {
294 (void) sprintf((caddr_t)str, "%02x", wwn[count]);
295 }
296 *str = '\0';
297 } else {
298 return (DEVFSADM_CONTINUE);
299 }
300
301 for (str = ascii_wwn; *str != '\0'; str++) {
302 *str = DISK_LINK_TO_UPPER(*str);
303 }
304
305 (void) snprintf(disk, DISK_SUBPATH_MAX, "t%sd%d", ascii_wwn, lun);
306
307 disk_common(minor, node, disk, RM_STALE);
308
309 return (DEVFSADM_CONTINUE);
310 }
311
312 static int
313 disk_callback_sas(di_minor_t minor, di_node_t node)
314 {
315 char disk[DISK_SUBPATH_MAX];
316 int lun64_found = 0;
317 scsi_lun64_t lun64, sl;
318 scsi_lun_t lun;
319 int64_t *lun64p;
320 uint64_t wwn;
321 int *intp;
322 char *tgt_port;
323 uchar_t addr_method;
324
325 /* Get lun property */
326 if (di_prop_lookup_int64(DDI_DEV_T_ANY, node,
327 SCSI_ADDR_PROP_LUN64, &lun64p) > 0) {
328 if (*lun64p != SCSI_LUN64_ILLEGAL) {
329 lun64_found = 1;
330 lun64 = (uint64_t)*lun64p;
331 }
332 }
333 if ((!lun64_found) && (di_prop_lookup_ints(DDI_DEV_T_ANY, node,
334 SCSI_ADDR_PROP_LUN, &intp) > 0)) {
335 lun64 = (uint64_t)*intp;
336 }
337
338 lun = scsi_lun64_to_lun(lun64);
339
340 addr_method = (lun.sl_lun1_msb & SCSI_LUN_AM_MASK);
341
342 if (di_prop_lookup_strings(DDI_DEV_T_ANY, node,
343 SCSI_ADDR_PROP_TARGET_PORT, &tgt_port) > 0) {
344 (void) scsi_wwnstr_to_wwn(tgt_port, &wwn);
345 if ((addr_method == SCSI_LUN_AM_PDEV) &&
346 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) &&
347 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) &&
348 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) {
349 (void) snprintf(disk, DISK_SUBPATH_MAX,
350 "t%"PRIX64"d%"PRId64, wwn, lun64);
351 } else if ((addr_method == SCSI_LUN_AM_FLAT) &&
352 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) &&
353 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) &&
354 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) {
355 sl = (lun.sl_lun1_msb << 8) | lun.sl_lun1_lsb;
356 (void) snprintf(disk, DISK_SUBPATH_MAX,
357 "t%"PRIX64"d%"PRIX16, wwn, sl);
358 } else {
359 (void) snprintf(disk, DISK_SUBPATH_MAX,
360 "t%"PRIX64"d%"PRIX64, wwn, lun64);
361 }
362 } else if (di_prop_lookup_ints(DDI_DEV_T_ANY, node,
363 SCSI_ADDR_PROP_SATA_PHY, &intp) > 0) {
364 /* Use phy format naming, for SATA devices without wwn */
365 if ((addr_method == SCSI_LUN_AM_PDEV) &&
366 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) &&
367 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) &&
368 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) {
369 (void) snprintf(disk, DISK_SUBPATH_MAX,
370 "t%dd%"PRId64, *intp, lun64);
371 } else if ((addr_method == SCSI_LUN_AM_FLAT) &&
372 (lun.sl_lun2_msb == 0) && (lun.sl_lun2_lsb == 0) &&
373 (lun.sl_lun3_msb == 0) && (lun.sl_lun3_lsb == 0) &&
374 (lun.sl_lun4_msb == 0) && (lun.sl_lun4_lsb == 0)) {
375 sl = (lun.sl_lun1_msb << 8) | lun.sl_lun1_lsb;
376 (void) snprintf(disk, DISK_SUBPATH_MAX,
377 "t%dd%"PRIX16, *intp, sl);
378 } else {
379 (void) snprintf(disk, DISK_SUBPATH_MAX,
380 "t%dd%"PRIX64, *intp, lun64);
381 }
382 } else {
383 return (DEVFSADM_CONTINUE);
384 }
385
386 disk_common(minor, node, disk, RM_STALE);
387
388 return (DEVFSADM_CONTINUE);
389 }
390
391 /*
392 * xVM virtual block device
393 *
394 * Xen passes device number in next format:
395 *
396 * 1 << 28 | disk << 8 | partition xvd, disks or partitions 16 onwards
397 * 202 << 8 | disk << 4 | partition xvd, disks and partitions up to 15
398 * 8 << 8 | disk << 4 | partition sd, disks and partitions up to 15
399 * 3 << 8 | disk << 6 | partition hd, disks 0..1, partitions 0..63
400 * 22 << 8 | (disk-2) << 6 | partition hd, disks 2..3, partitions 0..63
401 * 2 << 28 onwards reserved for future use
402 * other values less than 1 << 28 deprecated / reserved
403 *
404 * The corresponding Solaris /dev/dsk name can be:
405 *
406 * c0tYdXsN
407 *
408 * where Y,X >= 0.
409 *
410 * For PV guests using the legacy naming (0, 1, 2, ...)
411 * the Solaris disk names created will be c0d[0..767]sN
412 */
413
414 #define HD_BASE (3 << 8)
415 #define XEN_EXT_SHIFT (28)
416
417 /*
418 * Return: Number of parsed and written parameters
419 */
420 static int
421 decode_xen_device(uint_t device, uint_t *disk, uint_t *plun)
422 {
423 uint_t dsk, lun = 0;
424 int ret = 1;
425
426 if ((device >> XEN_EXT_SHIFT) > 1)
427 return (0);
428
429 if (device < HD_BASE) {
430 /* legacy device address */
431 dsk = device;
432 goto end;
433 }
434
435 ret = 2;
436 if (device & (1 << XEN_EXT_SHIFT)) {
437 /* extended */
438 dsk = device & (~0xff);
439 lun = device & 0xff;
440 goto end;
441 }
442
443 switch (device >> 8) {
444 case 202: /* xvd */
445 dsk = (device >> 4) & 0xf;
446 lun = device & 0xf;
447 break;
448 case 8: /* sd */
449 dsk = device & (~0xf);
450 lun = device & 0xf;
451 break;
452 case 3: /* hd, disk 0..1 */
453 dsk = device & (~0x3f);
454 lun = device & 0x3f;
455 break;
456 case 22: /* hd, disk 2..3 */
457 dsk = device & (~0x3f);
458 lun = device & 0x3f;
459 break;
460 default:
461 return (0);
462 }
463 end:
464 *disk = dsk;
465 *plun = lun;
466 return (ret);
467 }
468
469 static int
470 disk_callback_xvmd(di_minor_t minor, di_node_t node)
471 {
472 char *addr;
473 char disk[16];
474 uint_t targ;
475 uint_t dsk, lun;
476 int res;
477
478 addr = di_bus_addr(node);
479 targ = strtol(addr, (char **)NULL, 10);
480
481 res = decode_xen_device(targ, &dsk, &lun);
482
483 /* HVM device names are generated using the standard generator */
484
485 if (res == 1)
486 (void) snprintf(disk, sizeof (disk), "d%d", dsk);
487 else if (res == 2)
488 (void) snprintf(disk, sizeof (disk), "t%dd%d", dsk, lun);
489 else {
490 devfsadm_errprint("%s: invalid disk device number (%s)\n",
491 modname, addr);
492 return (DEVFSADM_CONTINUE);
493 }
494 disk_common(minor, node, disk, 0);
495 return (DEVFSADM_CONTINUE);
496
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 }
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