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7712 mandoc -Tlint does always exit with error code 0
[unleashed.git] / usr / src / uts / common / io / lvm / md / md.c
blob4fcd89708a689f70f6404577d7ace45583eb6693
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 (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011 Bayard G. Bell. All rights reserved.
25 */
26
27 /*
28 * Md - is the meta-disk driver. It sits below the UFS file system
29 * but above the 'real' disk drivers, xy, id, sd etc.
30 *
31 * To the UFS software, md looks like a normal driver, since it has
32 * the normal kinds of entries in the bdevsw and cdevsw arrays. So
33 * UFS accesses md in the usual ways. In particular, the strategy
34 * routine, mdstrategy(), gets called by fbiwrite(), ufs_getapage(),
35 * and ufs_writelbn().
36 *
37 * Md maintains an array of minor devices (meta-partitions). Each
38 * meta partition stands for a matrix of real partitions, in rows
39 * which are not necessarily of equal length. Md maintains a table,
40 * with one entry for each meta-partition, which lists the rows and
41 * columns of actual partitions, and the job of the strategy routine
42 * is to translate from the meta-partition device and block numbers
43 * known to UFS into the actual partitions' device and block numbers.
44 *
45 * See below, in mdstrategy(), mdreal(), and mddone() for details of
46 * this translation.
47 */
48
49 /*
50 * Driver for Virtual Disk.
51 */
52
53 #include <sys/user.h>
54 #include <sys/sysmacros.h>
55 #include <sys/conf.h>
56 #include <sys/stat.h>
57 #include <sys/errno.h>
58 #include <sys/param.h>
59 #include <sys/systm.h>
60 #include <sys/file.h>
61 #include <sys/open.h>
62 #include <sys/dkio.h>
63 #include <sys/vtoc.h>
64 #include <sys/cmn_err.h>
65 #include <sys/ddi.h>
66 #include <sys/sunddi.h>
67 #include <sys/debug.h>
68 #include <sys/utsname.h>
69 #include <sys/lvm/mdvar.h>
70 #include <sys/lvm/md_names.h>
71 #include <sys/lvm/md_mddb.h>
72 #include <sys/lvm/md_sp.h>
73 #include <sys/types.h>
74 #include <sys/kmem.h>
75 #include <sys/cladm.h>
76 #include <sys/priv_names.h>
77 #include <sys/modhash.h>
78
79 int md_init_debug = 0; /* module binding debug */
80
81 /*
82 * Tunable to turn off the failfast behavior.
83 */
84 int md_ff_disable = 0;
85
86 /*
87 * dynamically allocated list of non FF driver names - needs to
88 * be freed when md is detached.
89 */
90 char **non_ff_drivers = NULL;
91
92 md_krwlock_t md_unit_array_rw; /* protects all unit arrays */
93 md_krwlock_t nm_lock; /* protects all the name spaces */
94
95 md_resync_t md_cpr_resync;
96
97 extern char svm_bootpath[];
98 #define SVM_PSEUDO_STR "/pseudo/md@0:"
99
100 #define VERSION_LENGTH 6
101 #define VERSION "1.0"
102
103 /*
104 * Keep track of possible 'orphan' entries in the name space
105 */
106 int *md_nm_snarfed = NULL;
107
108 /*
109 * Global tunable giving the percentage of free space left in replica during
110 * conversion of non-devid style replica to devid style replica.
111 */
112 int md_conv_perc = MDDB_DEVID_CONV_PERC;
113
114 #ifdef DEBUG
115 /* debug code to verify framework exclusion guarantees */
116 int md_in;
117 kmutex_t md_in_mx; /* used to md global stuff */
118 #define IN_INIT 0x01
119 #define IN_FINI 0x02
120 #define IN_ATTACH 0x04
121 #define IN_DETACH 0x08
122 #define IN_OPEN 0x10
123 #define MD_SET_IN(x) { \
124 mutex_enter(&md_in_mx); \
125 if (md_in) \
126 debug_enter("MD_SET_IN exclusion lost"); \
127 if (md_in & x) \
128 debug_enter("MD_SET_IN already set"); \
129 md_in |= x; \
130 mutex_exit(&md_in_mx); \
131 }
132
133 #define MD_CLR_IN(x) { \
134 mutex_enter(&md_in_mx); \
135 if (md_in & ~(x)) \
136 debug_enter("MD_CLR_IN exclusion lost"); \
137 if (!(md_in & x)) \
138 debug_enter("MD_CLR_IN already clr"); \
139 md_in &= ~x; \
140 mutex_exit(&md_in_mx); \
141 }
142 #else /* DEBUG */
143 #define MD_SET_IN(x)
144 #define MD_CLR_IN(x)
145 #endif /* DEBUG */
146 hrtime_t savetime1, savetime2;
147
148
149 /*
150 * list things protected by md_mx even if they aren't
151 * used in this file.
152 */
153 kmutex_t md_mx; /* used to md global stuff */
154 kcondvar_t md_cv; /* md_status events */
155 int md_status = 0; /* global status for the meta-driver */
156 int md_num_daemons = 0;
157 int md_ioctl_cnt = 0;
158 int md_mtioctl_cnt = 0; /* multithreaded ioctl cnt */
159 uint_t md_mdelay = 10; /* variable so can be patched */
160
161 int (*mdv_strategy_tstpnt)(buf_t *, int, void*);
162
163 major_t md_major, md_major_targ;
164
165 unit_t md_nunits = MD_MAXUNITS;
166 set_t md_nsets = MD_MAXSETS;
167 int md_nmedh = 0;
168 char *md_med_trans_lst = NULL;
169 md_set_t md_set[MD_MAXSETS];
170 md_set_io_t md_set_io[MD_MAXSETS];
171
172 md_krwlock_t hsp_rwlp; /* protects hot_spare_interface */
173 md_krwlock_t ni_rwlp; /* protects notify_interface */
174 md_ops_t **md_ops = NULL;
175 ddi_modhandle_t *md_mods = NULL;
176 md_ops_t *md_opslist;
177 clock_t md_hz;
178 md_event_queue_t *md_event_queue = NULL;
179
180 int md_in_upgrade;
181 int md_keep_repl_state;
182 int md_devid_destroy;
183
184 /* for sending messages thru a door to userland */
185 door_handle_t mdmn_door_handle = NULL;
186 int mdmn_door_did = -1;
187
188 dev_info_t *md_devinfo = NULL;
189
190 md_mn_nodeid_t md_mn_mynode_id = ~0u; /* My node id (for multi-node sets) */
191
192 static uint_t md_ocnt[OTYPCNT];
193
194 static int mdinfo(dev_info_t *, ddi_info_cmd_t, void *, void **);
195 static int mdattach(dev_info_t *, ddi_attach_cmd_t);
196 static int mddetach(dev_info_t *, ddi_detach_cmd_t);
197 static int mdopen(dev_t *, int, int, cred_t *);
198 static int mdclose(dev_t, int, int, cred_t *);
199 static int mddump(dev_t, caddr_t, daddr_t, int);
200 static int mdread(dev_t, struct uio *, cred_t *);
201 static int mdwrite(dev_t, struct uio *, cred_t *);
202 static int mdaread(dev_t, struct aio_req *, cred_t *);
203 static int mdawrite(dev_t, struct aio_req *, cred_t *);
204 static int mdioctl(dev_t, int, intptr_t, int, cred_t *, int *);
205 static int mdprop_op(dev_t, dev_info_t *,
206 ddi_prop_op_t, int, char *, caddr_t, int *);
207
208 static struct cb_ops md_cb_ops = {
209 mdopen, /* open */
210 mdclose, /* close */
211 mdstrategy, /* strategy */
212 /* print routine -- none yet */
213 (int(*)(dev_t, char *))nulldev,
214 mddump, /* dump */
215 mdread, /* read */
216 mdwrite, /* write */
217 mdioctl, /* ioctl */
218 /* devmap */
219 (int(*)(dev_t, devmap_cookie_t, offset_t, size_t, size_t *,
220 uint_t))nodev,
221 /* mmap */
222 (int(*)(dev_t, off_t, int))nodev,
223 /* segmap */
224 (int(*)(dev_t, off_t, struct as *, caddr_t *, off_t, unsigned,
225 unsigned, unsigned, cred_t *))nodev,
226 nochpoll, /* poll */
227 mdprop_op, /* prop_op */
228 0, /* streamtab */
229 (D_64BIT|D_MP|D_NEW), /* driver compatibility flag */
230 CB_REV, /* cb_ops version */
231 mdaread, /* aread */
232 mdawrite, /* awrite */
233 };
234
235 static struct dev_ops md_devops = {
236 DEVO_REV, /* dev_ops version */
237 0, /* device reference count */
238 mdinfo, /* info routine */
239 nulldev, /* identify routine */
240 nulldev, /* probe - not defined */
241 mdattach, /* attach routine */
242 mddetach, /* detach routine */
243 nodev, /* reset - not defined */
244 &md_cb_ops, /* driver operations */
245 NULL, /* bus operations */
246 nodev, /* power management */
247 ddi_quiesce_not_needed, /* quiesce */
248 };
249
250 /*
251 * loadable module wrapper
252 */
253 #include <sys/modctl.h>
254
255 static struct modldrv modldrv = {
256 &mod_driverops, /* type of module -- a pseudodriver */
257 "Solaris Volume Manager base module", /* name of the module */
258 &md_devops, /* driver ops */
259 };
260
261 static struct modlinkage modlinkage = {
262 MODREV_1,
263 (void *)&modldrv,
264 NULL
265 };
266
267
268 /* md_medd.c */
269 extern void med_init(void);
270 extern void med_fini(void);
271 extern void md_devid_cleanup(set_t, uint_t);
272
273 /* md_names.c */
274 extern struct nm_next_hdr *get_first_record(set_t, int, int);
275
276 int md_maxphys = 0; /* maximum io size in bytes */
277 #define MD_MAXBCOUNT (1024 * 1024)
278 unsigned md_maxbcount = 0; /* maximum physio size in bytes */
279
280 /*
281 * Some md ioctls trigger io framework device tree operations. An
282 * example is md ioctls that call md_resolve_bydevid(): which uses the
283 * io framework to resolve a devid. Such operations result in acquiring
284 * io framework locks (like ndi_devi_enter() of "/") while holding
285 * driver locks (like md_unit_writerlock()).
286 *
287 * The prop_op(9E) entry point is called from the devinfo driver with
288 * an active ndi_devi_enter of "/". To avoid deadlock, md's prop_op
289 * implementation must avoid taking a lock that is held per above md
290 * ioctl description: i.e. mdprop_op(9E) can't call md_unit_readerlock()
291 * without risking deadlock.
292 *
293 * To service "size" requests without risking deadlock, we maintain a
294 * "mnum->nblocks" sizemap (protected by a short-term global mutex).
295 */
296 static kmutex_t md_nblocks_mutex;
297 static mod_hash_t *md_nblocksmap; /* mnum -> nblocks */
298 int md_nblocksmap_size = 512;
299
300 /*
301 * Maintain "mnum->nblocks" sizemap for mdprop_op use:
302 *
303 * Create: any code that establishes a unit's un_total_blocks needs the
304 * following type of call to establish nblocks for mdprop_op():
305 * md_nblocks_set(mnum, un->c.un_total_blocks);"
306 * NOTE: locate via cscope md_create_minor_node/md_create_unit_incore
307 * ...or "MD_UNIT..*="
308 *
309 * Change: any code that changes a unit's un_total_blocks needs the
310 * following type of call to sync nblocks for mdprop_op():
311 * md_nblocks_set(mnum, un->c.un_total_blocks);"
312 * NOTE: locate via cscope for "un_total_blocks[ \t]*="
313 *
314 * Destroy: any code that deletes a unit needs the following type of call
315 * to sync nblocks for mdprop_op():
316 * md_nblocks_set(mnum, -1ULL);
317 * NOTE: locate via cscope md_remove_minor_node/md_destroy_unit_incore
318 * ...or "MD_UNIT..*="
319 */
320 void
321 md_nblocks_set(minor_t mnum, uint64_t nblocks)
322 {
323 mutex_enter(&md_nblocks_mutex);
324 if (nblocks == -1ULL)
325 (void) mod_hash_destroy(md_nblocksmap,
326 (mod_hash_key_t)(intptr_t)mnum);
327 else
328 (void) mod_hash_replace(md_nblocksmap,
329 (mod_hash_key_t)(intptr_t)mnum,
330 (mod_hash_val_t)(intptr_t)nblocks);
331 mutex_exit(&md_nblocks_mutex);
332 }
333
334 /* get the size of a mnum from "mnum->nblocks" sizemap */
335 uint64_t
336 md_nblocks_get(minor_t mnum)
337 {
338 mod_hash_val_t hv;
339
340 mutex_enter(&md_nblocks_mutex);
341 if (mod_hash_find(md_nblocksmap,
342 (mod_hash_key_t)(intptr_t)mnum, &hv) == 0) {
343 mutex_exit(&md_nblocks_mutex);
344 return ((uint64_t)(intptr_t)hv);
345 }
346 mutex_exit(&md_nblocks_mutex);
347 return (0);
348 }
349
350 /* allocate/free dynamic space associated with driver globals */
351 void
352 md_global_alloc_free(int alloc)
353 {
354 set_t s;
355
356 if (alloc) {
357 /* initialize driver global locks */
358 cv_init(&md_cv, NULL, CV_DEFAULT, NULL);
359 mutex_init(&md_mx, NULL, MUTEX_DEFAULT, NULL);
360 rw_init(&md_unit_array_rw.lock, NULL, RW_DEFAULT, NULL);
361 rw_init(&nm_lock.lock, NULL, RW_DEFAULT, NULL);
362 rw_init(&ni_rwlp.lock, NULL, RW_DRIVER, NULL);
363 rw_init(&hsp_rwlp.lock, NULL, RW_DRIVER, NULL);
364 mutex_init(&md_cpr_resync.md_resync_mutex, NULL,
365 MUTEX_DEFAULT, NULL);
366 mutex_init(&md_nblocks_mutex, NULL, MUTEX_DEFAULT, NULL);
367
368 /* initialize per set driver global locks */
369 for (s = 0; s < MD_MAXSETS; s++) {
370 /* initialize per set driver globals locks */
371 mutex_init(&md_set[s].s_dbmx,
372 NULL, MUTEX_DEFAULT, NULL);
373 mutex_init(&md_set_io[s].md_io_mx,
374 NULL, MUTEX_DEFAULT, NULL);
375 cv_init(&md_set_io[s].md_io_cv,
376 NULL, CV_DEFAULT, NULL);
377 }
378 } else {
379 /* destroy per set driver global locks */
380 for (s = 0; s < MD_MAXSETS; s++) {
381 cv_destroy(&md_set_io[s].md_io_cv);
382 mutex_destroy(&md_set_io[s].md_io_mx);
383 mutex_destroy(&md_set[s].s_dbmx);
384 }
385
386 /* destroy driver global locks */
387 mutex_destroy(&md_nblocks_mutex);
388 mutex_destroy(&md_cpr_resync.md_resync_mutex);
389 rw_destroy(&hsp_rwlp.lock);
390 rw_destroy(&ni_rwlp.lock);
391 rw_destroy(&nm_lock.lock);
392 rw_destroy(&md_unit_array_rw.lock);
393 mutex_destroy(&md_mx);
394 cv_destroy(&md_cv);
395 }
396 }
397
398 int
399 _init(void)
400 {
401 set_t s;
402 int err;
403
404 MD_SET_IN(IN_INIT);
405
406 /* allocate dynamic space associated with driver globals */
407 md_global_alloc_free(1);
408
409 /* initialize driver globals */
410 md_major = ddi_name_to_major("md");
411 md_hz = drv_usectohz(NUM_USEC_IN_SEC);
412
413 /* initialize tunable globals */
414 if (md_maxphys == 0) /* maximum io size in bytes */
415 md_maxphys = maxphys;
416 if (md_maxbcount == 0) /* maximum physio size in bytes */
417 md_maxbcount = MD_MAXBCOUNT;
418
419 /* initialize per set driver globals */
420 for (s = 0; s < MD_MAXSETS; s++)
421 md_set_io[s].io_state = MD_SET_ACTIVE;
422
423 /*
424 * NOTE: the framework does not currently guarantee exclusion
425 * between _init and attach after calling mod_install.
426 */
427 MD_CLR_IN(IN_INIT);
428 if ((err = mod_install(&modlinkage))) {
429 MD_SET_IN(IN_INIT);
430 md_global_alloc_free(0); /* free dynamic space */
431 MD_CLR_IN(IN_INIT);
432 }
433 return (err);
434 }
435
436 int
437 _fini(void)
438 {
439 int err;
440
441 /*
442 * NOTE: the framework currently does not guarantee exclusion
443 * with attach until after mod_remove returns 0.
444 */
445 if ((err = mod_remove(&modlinkage)))
446 return (err);
447
448 MD_SET_IN(IN_FINI);
449 md_global_alloc_free(0); /* free dynamic space */
450 MD_CLR_IN(IN_FINI);
451 return (err);
452 }
453
454 int
455 _info(struct modinfo *modinfop)
456 {
457 return (mod_info(&modlinkage, modinfop));
458 }
459
460 /* ARGSUSED */
461 static int
462 mdattach(dev_info_t *dip, ddi_attach_cmd_t cmd)
463 {
464 int len;
465 unit_t i;
466 size_t sz;
467 char ver[VERSION_LENGTH];
468 char **maj_str_array;
469 char *str, *str2;
470
471 MD_SET_IN(IN_ATTACH);
472 md_in_upgrade = 0;
473 md_keep_repl_state = 0;
474 md_devid_destroy = 0;
475
476 if (cmd != DDI_ATTACH) {
477 MD_CLR_IN(IN_ATTACH);
478 return (DDI_FAILURE);
479 }
480
481 if (md_devinfo != NULL) {
482 MD_CLR_IN(IN_ATTACH);
483 return (DDI_FAILURE);
484 }
485
486 mddb_init();
487
488 if (md_start_daemons(TRUE)) {
489 MD_CLR_IN(IN_ATTACH);
490 mddb_unload(); /* undo mddb_init() allocations */
491 return (DDI_FAILURE);
492 }
493
494 /* clear the halted state */
495 md_clr_status(MD_GBL_HALTED);
496
497 /* see if the diagnostic switch is on */
498 if (ddi_prop_get_int(DDI_DEV_T_ANY, dip,
499 DDI_PROP_DONTPASS, "md_init_debug", 0))
500 md_init_debug++;
501
502 /* see if the failfast disable switch is on */
503 if (ddi_prop_get_int(DDI_DEV_T_ANY, dip,
504 DDI_PROP_DONTPASS, "md_ff_disable", 0))
505 md_ff_disable++;
506
507 /* try and get the md_nmedh property */
508 md_nmedh = ddi_prop_get_int(DDI_DEV_T_ANY, dip,
509 DDI_PROP_DONTPASS, "md_nmedh", MED_DEF_HOSTS);
510 if ((md_nmedh <= 0) || (md_nmedh > MED_MAX_HOSTS))
511 md_nmedh = MED_DEF_HOSTS;
512
513 /* try and get the md_med_trans_lst property */
514 len = 0;
515 if (ddi_prop_op(DDI_DEV_T_ANY, dip, PROP_LEN,
516 0, "md_med_trans_lst", NULL, &len) != DDI_PROP_SUCCESS ||
517 len == 0) {
518 md_med_trans_lst = md_strdup("tcp");
519 } else {
520 md_med_trans_lst = kmem_zalloc((size_t)len, KM_SLEEP);
521 if (ddi_prop_op(DDI_DEV_T_ANY, dip, PROP_LEN_AND_VAL_BUF,
522 0, "md_med_trans_lst", md_med_trans_lst, &len) !=
523 DDI_PROP_SUCCESS) {
524 kmem_free(md_med_trans_lst, (size_t)len);
525 md_med_trans_lst = md_strdup("tcp");
526 }
527 }
528
529 /*
530 * Must initialize the internal data structures before the
531 * any possible calls to 'goto attach_failure' as _fini
532 * routine references them.
533 */
534 med_init();
535
536 md_ops = (md_ops_t **)kmem_zalloc(
537 sizeof (md_ops_t *) * MD_NOPS, KM_SLEEP);
538 md_mods = (ddi_modhandle_t *)kmem_zalloc(
539 sizeof (ddi_modhandle_t) * MD_NOPS, KM_SLEEP);
540
541 /* try and get the md_xlate property */
542 /* Should we only do this if upgrade? */
543 len = sizeof (char) * 5;
544 if (ddi_prop_op(DDI_DEV_T_ANY, dip, PROP_LEN_AND_VAL_BUF,
545 0, "md_xlate_ver", ver, &len) == DDI_PROP_SUCCESS) {
546 if (strcmp(ver, VERSION) == 0) {
547 len = 0;
548 if (ddi_prop_op(DDI_DEV_T_ANY, dip,
549 PROP_LEN_AND_VAL_ALLOC, 0, "md_xlate",
550 (caddr_t)&md_tuple_table, &len) !=
551 DDI_PROP_SUCCESS) {
552 if (md_init_debug)
553 cmn_err(CE_WARN,
554 "md_xlate ddi_prop_op failed");
555 goto attach_failure;
556 } else {
557 md_tuple_length =
558 len/(2 * ((int)sizeof (dev32_t)));
559 md_in_upgrade = 1;
560 }
561
562 /* Get target's name to major table */
563 if (ddi_prop_lookup_string_array(DDI_DEV_T_ANY,
564 dip, DDI_PROP_DONTPASS,
565 "md_targ_nm_table", &maj_str_array,
566 &md_majortab_len) != DDI_PROP_SUCCESS) {
567 md_majortab_len = 0;
568 if (md_init_debug)
569 cmn_err(CE_WARN, "md_targ_nm_table "
570 "ddi_prop_lookup_string_array "
571 "failed");
572 goto attach_failure;
573 }
574
575 md_major_tuple_table =
576 (struct md_xlate_major_table *)
577 kmem_zalloc(md_majortab_len *
578 sizeof (struct md_xlate_major_table), KM_SLEEP);
579
580 for (i = 0; i < md_majortab_len; i++) {
581 /* Getting major name */
582 str = strchr(maj_str_array[i], ' ');
583 if (str == NULL)
584 continue;
585 *str = '\0';
586 md_major_tuple_table[i].drv_name =
587 md_strdup(maj_str_array[i]);
588
589 /* Simplified atoi to get major number */
590 str2 = str + 1;
591 md_major_tuple_table[i].targ_maj = 0;
592 while ((*str2 >= '0') && (*str2 <= '9')) {
593 md_major_tuple_table[i].targ_maj *= 10;
594 md_major_tuple_table[i].targ_maj +=
595 *str2++ - '0';
596 }
597 *str = ' ';
598 }
599 ddi_prop_free((void *)maj_str_array);
600 } else {
601 if (md_init_debug)
602 cmn_err(CE_WARN, "md_xlate_ver is incorrect");
603 goto attach_failure;
604 }
605 }
606
607 /*
608 * Check for properties:
609 * md_keep_repl_state and md_devid_destroy
610 * and set globals if these exist.
611 */
612 md_keep_repl_state = ddi_getprop(DDI_DEV_T_ANY, dip,
613 0, "md_keep_repl_state", 0);
614
615 md_devid_destroy = ddi_getprop(DDI_DEV_T_ANY, dip,
616 0, "md_devid_destroy", 0);
617
618 if (MD_UPGRADE)
619 md_major_targ = md_targ_name_to_major("md");
620 else
621 md_major_targ = 0;
622
623 /* allocate admin device node */
624 if (ddi_create_priv_minor_node(dip, "admin", S_IFCHR,
625 MD_ADM_MINOR, DDI_PSEUDO, 0, NULL, PRIV_SYS_CONFIG, 0640))
626 goto attach_failure;
627
628 if (ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP,
629 DDI_KERNEL_IOCTL, NULL, 0) != DDI_SUCCESS)
630 goto attach_failure;
631
632 if (ddi_prop_update_int(DDI_DEV_T_NONE, dip,
633 "ddi-abrwrite-supported", 1) != DDI_SUCCESS)
634 goto attach_failure;
635
636 /* these could have been cleared by a detach */
637 md_nunits = MD_MAXUNITS;
638 md_nsets = MD_MAXSETS;
639
640 sz = sizeof (void *) * MD_MAXUNITS;
641 if (md_set[0].s_un == NULL)
642 md_set[0].s_un = kmem_zalloc(sz, KM_SLEEP);
643 if (md_set[0].s_ui == NULL)
644 md_set[0].s_ui = kmem_zalloc(sz, KM_SLEEP);
645
646 md_devinfo = dip;
647
648 /*
649 * Only allocate device node for root mirror metadevice.
650 * Don't pre-allocate unnecessary device nodes (thus slowing down a
651 * boot when we attach).
652 * We can't read the mddbs in attach. The mddbs will be read
653 * by metainit during the boot process when it is doing the
654 * auto-take processing and any other minor nodes will be
655 * allocated at that point.
656 *
657 * There are two scenarios to be aware of here:
658 * 1) when we are booting from a mirrored root we need the root
659 * metadevice to exist very early (during vfs_mountroot processing)
660 * 2) we need all of the nodes to be created so that any mnttab entries
661 * will succeed (handled by metainit reading the mddb during boot).
662 */
663 if (strncmp(SVM_PSEUDO_STR, svm_bootpath, sizeof (SVM_PSEUDO_STR) - 1)
664 == 0) {
665 char *p;
666 int mnum = 0;
667
668 /*
669 * The svm_bootpath string looks something like
670 * /pseudo/md@0:0,150,blk where 150 is the minor number
671 * in this example so we need to set the pointer p onto
672 * the first digit of the minor number and convert it
673 * from ascii.
674 */
675 for (p = svm_bootpath + sizeof (SVM_PSEUDO_STR) + 1;
676 *p >= '0' && *p <= '9'; p++) {
677 mnum *= 10;
678 mnum += *p - '0';
679 }
680
681 if (md_create_minor_node(0, mnum)) {
682 kmem_free(md_set[0].s_un, sz);
683 kmem_free(md_set[0].s_ui, sz);
684 goto attach_failure;
685 }
686 }
687
688 /* create the hash to store the meta device sizes */
689 md_nblocksmap = mod_hash_create_idhash("md_nblocksmap",
690 md_nblocksmap_size, mod_hash_null_valdtor);
691
692 MD_CLR_IN(IN_ATTACH);
693 return (DDI_SUCCESS);
694
695 attach_failure:
696 /*
697 * Use our own detach routine to toss any stuff we allocated above.
698 * NOTE: detach will call md_halt to free the mddb_init allocations.
699 */
700 MD_CLR_IN(IN_ATTACH);
701 if (mddetach(dip, DDI_DETACH) != DDI_SUCCESS)
702 cmn_err(CE_WARN, "detach from attach failed");
703 return (DDI_FAILURE);
704 }
705
706 /* ARGSUSED */
707 static int
708 mddetach(dev_info_t *dip, ddi_detach_cmd_t cmd)
709 {
710 extern int check_active_locators();
711 set_t s;
712 size_t sz;
713 int len;
714
715 MD_SET_IN(IN_DETACH);
716
717 /* check command */
718 if (cmd != DDI_DETACH) {
719 MD_CLR_IN(IN_DETACH);
720 return (DDI_FAILURE);
721 }
722
723 /*
724 * if we have not already halted yet we have no active config
725 * then automatically initiate a halt so we can detach.
726 */
727 if (!(md_get_status() & MD_GBL_HALTED)) {
728 if (check_active_locators() == 0) {
729 /*
730 * NOTE: a successful md_halt will have done the
731 * mddb_unload to free allocations done in mddb_init
732 */
733 if (md_halt(MD_NO_GBL_LOCKS_HELD)) {
734 cmn_err(CE_NOTE, "md:detach: "
735 "Could not halt Solaris Volume Manager");
736 MD_CLR_IN(IN_DETACH);
737 return (DDI_FAILURE);
738 }
739 }
740
741 /* fail detach if we have not halted */
742 if (!(md_get_status() & MD_GBL_HALTED)) {
743 MD_CLR_IN(IN_DETACH);
744 return (DDI_FAILURE);
745 }
746 }
747
748 /* must be in halted state, this will be cleared on next attach */
749 ASSERT(md_get_status() & MD_GBL_HALTED);
750
751 /* cleanup attach allocations and initializations */
752 md_major_targ = 0;
753
754 sz = sizeof (void *) * md_nunits;
755 for (s = 0; s < md_nsets; s++) {
756 if (md_set[s].s_un != NULL) {
757 kmem_free(md_set[s].s_un, sz);
758 md_set[s].s_un = NULL;
759 }
760
761 if (md_set[s].s_ui != NULL) {
762 kmem_free(md_set[s].s_ui, sz);
763 md_set[s].s_ui = NULL;
764 }
765 }
766 md_nunits = 0;
767 md_nsets = 0;
768 md_nmedh = 0;
769
770 if (non_ff_drivers != NULL) {
771 int i;
772
773 for (i = 0; non_ff_drivers[i] != NULL; i++)
774 kmem_free(non_ff_drivers[i],
775 strlen(non_ff_drivers[i]) + 1);
776
777 /* free i+1 entries because there is a null entry at list end */
778 kmem_free(non_ff_drivers, (i + 1) * sizeof (char *));
779 non_ff_drivers = NULL;
780 }
781
782 if (md_med_trans_lst != NULL) {
783 kmem_free(md_med_trans_lst, strlen(md_med_trans_lst) + 1);
784 md_med_trans_lst = NULL;
785 }
786
787 if (md_mods != NULL) {
788 kmem_free(md_mods, sizeof (ddi_modhandle_t) * MD_NOPS);
789 md_mods = NULL;
790 }
791
792 if (md_ops != NULL) {
793 kmem_free(md_ops, sizeof (md_ops_t *) * MD_NOPS);
794 md_ops = NULL;
795 }
796
797 if (MD_UPGRADE) {
798 len = md_tuple_length * (2 * ((int)sizeof (dev32_t)));
799 md_in_upgrade = 0;
800 md_xlate_free(len);
801 md_majortab_free();
802 }
803
804 /*
805 * Undo what we did in mdattach, freeing resources
806 * and removing things we installed. The system
807 * framework guarantees we are not active with this devinfo
808 * node in any other entry points at this time.
809 */
810 ddi_prop_remove_all(dip);
811 ddi_remove_minor_node(dip, NULL);
812
813 med_fini();
814
815 mod_hash_destroy_idhash(md_nblocksmap);
816
817 md_devinfo = NULL;
818
819 MD_CLR_IN(IN_DETACH);
820 return (DDI_SUCCESS);
821 }
822
823
824 /*
825 * Given the device number return the devinfo pointer
826 * given to md via md_attach
827 */
828 /*ARGSUSED*/
829 static int
830 mdinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
831 {
832 int error = DDI_FAILURE;
833
834 switch (infocmd) {
835 case DDI_INFO_DEVT2DEVINFO:
836 if (md_devinfo) {
837 *result = (void *)md_devinfo;
838 error = DDI_SUCCESS;
839 }
840 break;
841
842 case DDI_INFO_DEVT2INSTANCE:
843 *result = (void *)0;
844 error = DDI_SUCCESS;
845 break;
846 }
847 return (error);
848 }
849
850 /*
851 * property operation routine. return the number of blocks for the partition
852 * in question or forward the request to the property facilities.
853 */
854 static int
855 mdprop_op(
856 dev_t dev, /* device number associated with device */
857 dev_info_t *dip, /* device info struct for this device */
858 ddi_prop_op_t prop_op, /* property operator */
859 int mod_flags, /* property flags */
860 char *name, /* name of property */
861 caddr_t valuep, /* where to put property value */
862 int *lengthp) /* put length of property here */
863 {
864 return (ddi_prop_op_nblocks(dev, dip, prop_op, mod_flags,
865 name, valuep, lengthp, md_nblocks_get(getminor(dev))));
866 }
867
868 static void
869 snarf_user_data(set_t setno)
870 {
871 mddb_recid_t recid;
872 mddb_recstatus_t status;
873
874 recid = mddb_makerecid(setno, 0);
875 while ((recid = mddb_getnextrec(recid, MDDB_USER, 0)) > 0) {
876 if (mddb_getrecprivate(recid) & MD_PRV_GOTIT)
877 continue;
878
879 status = mddb_getrecstatus(recid);
880 if (status == MDDB_STALE)
881 continue;
882
883 if (status == MDDB_NODATA) {
884 mddb_setrecprivate(recid, MD_PRV_PENDDEL);
885 continue;
886 }
887
888 ASSERT(status == MDDB_OK);
889
890 mddb_setrecprivate(recid, MD_PRV_GOTIT);
891 }
892 }
893
894 static void
895 md_print_block_usage(mddb_set_t *s, uint_t blks)
896 {
897 uint_t ib;
898 int li;
899 mddb_mb_ic_t *mbip;
900 uint_t max_blk_needed;
901 mddb_lb_t *lbp;
902 mddb_sidelocator_t *slp;
903 int drv_index;
904 md_splitname sn;
905 char *name;
906 char *suffix;
907 size_t prefixlen;
908 size_t suffixlen;
909 int alloc_sz;
910
911
912 max_blk_needed = s->s_totalblkcnt - s->s_freeblkcnt + blks;
913
914 cmn_err(CE_WARN, "Blocks in Metadevice State Database: %d\n"
915 " Additional Blocks Needed: %d\n\n"
916 " Increase size of following replicas for\n"
917 " device relocatability by deleting listed\n"
918 " replica and re-adding replica with\n"
919 " increased size (see metadb(1M)):\n"
920 " Replica Increase By",
921 s->s_totalblkcnt, (blks - s->s_freeblkcnt));
922
923 lbp = s->s_lbp;
924
925 for (li = 0; li < lbp->lb_loccnt; li++) {
926 if (lbp->lb_locators[li].l_flags & MDDB_F_DELETED)
927 continue;
928 ib = 0;
929 for (mbip = s->s_mbiarray[li]; mbip != NULL;
930 mbip = mbip->mbi_next) {
931 ib += (uint_t)mbip->mbi_mddb_mb.mb_blkcnt;
932 }
933 if (ib == 0)
934 continue;
935 if (ib < max_blk_needed) {
936 slp = &lbp->lb_sidelocators[s->s_sideno][li];
937 drv_index = slp->l_drvnm_index;
938 mddb_locatorblock2splitname(s->s_lnp, li, s->s_sideno,
939 &sn);
940 prefixlen = SPN_PREFIX(&sn).pre_len;
941 suffixlen = SPN_SUFFIX(&sn).suf_len;
942 alloc_sz = (int)(prefixlen + suffixlen + 2);
943 name = (char *)kmem_alloc(alloc_sz, KM_SLEEP);
944 (void) strncpy(name, SPN_PREFIX(&sn).pre_data,
945 prefixlen);
946 name[prefixlen] = '/';
947 suffix = name + (prefixlen + 1);
948 (void) strncpy(suffix, SPN_SUFFIX(&sn).suf_data,
949 suffixlen);
950 name[prefixlen + suffixlen + 1] = '\0';
951 cmn_err(CE_WARN,
952 " %s (%s:%d:%d) %d blocks",
953 name, lbp->lb_drvnm[drv_index].dn_data,
954 slp->l_mnum, lbp->lb_locators[li].l_blkno,
955 (max_blk_needed - ib));
956 kmem_free(name, alloc_sz);
957 }
958 }
959 }
960
961 /*
962 * md_create_minor_node:
963 * Create the minor device for the given set and un_self_id.
964 *
965 * Input:
966 * setno - set number
967 * mnum - selfID of unit
968 *
969 * Output:
970 * None.
971 *
972 * Returns 0 for success, 1 for failure.
973 *
974 * Side-effects:
975 * None.
976 */
977 int
978 md_create_minor_node(set_t setno, minor_t mnum)
979 {
980 char name[20];
981
982 /* Check for valid arguments */
983 if (setno >= MD_MAXSETS || MD_MIN2UNIT(mnum) >= MD_MAXUNITS)
984 return (1);
985
986 (void) snprintf(name, 20, "%u,%u,blk",
987 (unsigned)setno, (unsigned)MD_MIN2UNIT(mnum));
988
989 if (ddi_create_minor_node(md_devinfo, name, S_IFBLK,
990 MD_MKMIN(setno, mnum), DDI_PSEUDO, 0))
991 return (1);
992
993 (void) snprintf(name, 20, "%u,%u,raw",
994 (unsigned)setno, (unsigned)MD_MIN2UNIT(mnum));
995
996 if (ddi_create_minor_node(md_devinfo, name, S_IFCHR,
997 MD_MKMIN(setno, mnum), DDI_PSEUDO, 0))
998 return (1);
999
1000 return (0);
1001 }
1002
1003 /*
1004 * For a given key check if it is an orphaned record.
1005 * The following conditions are used to determine an orphan.
1006 * 1. The device associated with that key is not a metadevice.
1007 * 2. If DEVID_STYLE then the physical device does not have a device Id
1008 * associated with it.
1009 *
1010 * If a key does not have an entry in the devid namespace it could be
1011 * a device that does not support device ids. Hence the record is not
1012 * deleted.
1013 */
1014
1015 static int
1016 md_verify_orphaned_record(set_t setno, mdkey_t key)
1017 {
1018 md_dev64_t odev; /* orphaned dev */
1019 mddb_set_t *s;
1020 side_t side = 0;
1021 struct nm_next_hdr *did_nh = NULL;
1022
1023 s = (mddb_set_t *)md_set[setno].s_db;
1024 if ((did_nh = get_first_record(setno, 1, (NM_DEVID | NM_NOTSHARED)))
1025 == NULL)
1026 return (0);
1027 /*
1028 * If devid style is set then get the dev_t using MD_NOTRUST_DEVT
1029 */
1030 if (s->s_lbp->lb_flags & MDDB_DEVID_STYLE) {
1031 odev = md_getdevnum(setno, side, key, MD_NOTRUST_DEVT);
1032 if ((odev == NODEV64) || (md_getmajor(odev) == md_major))
1033 return (0);
1034 if (lookup_entry(did_nh, setno, side, key, odev, NM_DEVID) ==
1035 NULL)
1036 return (1);
1037 }
1038 return (0);
1039 }
1040
1041 int
1042 md_snarf_db_set(set_t setno, md_error_t *ep)
1043 {
1044 int err = 0;
1045 int i;
1046 mddb_recid_t recid;
1047 mddb_type_t drvrid;
1048 mddb_recstatus_t status;
1049 md_ops_t *ops;
1050 uint_t privat;
1051 mddb_set_t *s;
1052 uint_t cvt_blks;
1053 struct nm_next_hdr *nh;
1054 mdkey_t key = MD_KEYWILD;
1055 side_t side = 0;
1056 int size;
1057 int devid_flag;
1058 int retval;
1059 uint_t un;
1060 int un_next_set = 0;
1061
1062 md_haltsnarf_enter(setno);
1063
1064 mutex_enter(&md_mx);
1065 if (md_set[setno].s_status & MD_SET_SNARFED) {
1066 mutex_exit(&md_mx);
1067 md_haltsnarf_exit(setno);
1068 return (0);
1069 }
1070 mutex_exit(&md_mx);
1071
1072 if (! (md_get_status() & MD_GBL_DAEMONS_LIVE)) {
1073 if (md_start_daemons(TRUE)) {
1074 if (ep != NULL)
1075 (void) mdsyserror(ep, ENXIO);
1076 err = -1;
1077 goto out;
1078 }
1079 }
1080
1081
1082 /*
1083 * Load the devid name space if it exists
1084 */
1085 (void) md_load_namespace(setno, NULL, NM_DEVID);
1086 if (!md_load_namespace(setno, ep, 0L)) {
1087 /*
1088 * Unload the devid namespace
1089 */
1090 (void) md_unload_namespace(setno, NM_DEVID);
1091 err = -1;
1092 goto out;
1093 }
1094
1095 /*
1096 * If replica is in non-devid state, convert if:
1097 * - not in probe during upgrade (md_keep_repl_state = 0)
1098 * - enough space available in replica
1099 * - local set
1100 * - not a multi-node diskset
1101 * - clustering is not present (for non-local set)
1102 */
1103 s = (mddb_set_t *)md_set[setno].s_db;
1104 devid_flag = 0;
1105 if (!(s->s_lbp->lb_flags & MDDB_DEVID_STYLE) && !md_keep_repl_state)
1106 devid_flag = 1;
1107 if (cluster_bootflags & CLUSTER_CONFIGURED)
1108 if (setno != MD_LOCAL_SET)
1109 devid_flag = 0;
1110 if (MD_MNSET_SETNO(setno))
1111 devid_flag = 0;
1112 if ((md_devid_destroy == 1) && (md_keep_repl_state == 1))
1113 devid_flag = 0;
1114
1115 /*
1116 * if we weren't devid style before and md_keep_repl_state=1
1117 * we need to stay non-devid
1118 */
1119 if ((md_keep_repl_state == 1) &&
1120 ((s->s_lbp->lb_flags & MDDB_DEVID_STYLE) == 0))
1121 devid_flag = 0;
1122 if (devid_flag) {
1123 /*
1124 * Determine number of free blocks needed to convert
1125 * entire replica to device id format - locator blocks
1126 * and namespace.
1127 */
1128 cvt_blks = 0;
1129 if (mddb_lb_did_convert(s, 0, &cvt_blks) != 0) {
1130 if (ep != NULL)
1131 (void) mdsyserror(ep, EIO);
1132 err = -1;
1133 goto out;
1134
1135 }
1136 cvt_blks += md_nm_did_chkspace(setno);
1137
1138 /* add MDDB_DEVID_CONV_PERC% */
1139 if ((md_conv_perc > 0) && (md_conv_perc <= 100)) {
1140 cvt_blks = cvt_blks * (100 + md_conv_perc) / 100;
1141 }
1142
1143 if (cvt_blks <= s->s_freeblkcnt) {
1144 if (mddb_lb_did_convert(s, 1, &cvt_blks) != 0) {
1145 if (ep != NULL)
1146 (void) mdsyserror(ep, EIO);
1147 err = -1;
1148 goto out;
1149 }
1150
1151 } else {
1152 /*
1153 * Print message that replica can't be converted for
1154 * lack of space. No failure - just continue to
1155 * run without device ids.
1156 */
1157 cmn_err(CE_WARN,
1158 "Unable to add Solaris Volume Manager device "
1159 "relocation data.\n"
1160 " To use device relocation feature:\n"
1161 " - Increase size of listed replicas\n"
1162 " - Reboot");
1163 md_print_block_usage(s, cvt_blks);
1164 cmn_err(CE_WARN,
1165 "Loading set without device relocation data.\n"
1166 " Solaris Volume Manager disk movement "
1167 "not tracked in local set.");
1168 }
1169 }
1170
1171 /*
1172 * go through and load any modules referenced in
1173 * data base
1174 */
1175 recid = mddb_makerecid(setno, 0);
1176 while ((recid = mddb_getnextrec(recid, MDDB_ALL, 0)) > 0) {
1177 status = mddb_getrecstatus(recid);
1178 if (status == MDDB_STALE) {
1179 if (! (md_get_setstatus(setno) & MD_SET_STALE)) {
1180 md_set_setstatus(setno, MD_SET_STALE);
1181 cmn_err(CE_WARN,
1182 "md: state database is stale");
1183 }
1184 } else if (status == MDDB_NODATA) {
1185 mddb_setrecprivate(recid, MD_PRV_PENDDEL);
1186 continue;
1187 }
1188 drvrid = mddb_getrectype1(recid);
1189 if (drvrid < MDDB_FIRST_MODID)
1190 continue;
1191 if (md_loadsubmod(setno, md_getshared_name(setno, drvrid),
1192 drvrid) < 0) {
1193 cmn_err(CE_NOTE, "md: could not load misc/%s",
1194 md_getshared_name(setno, drvrid));
1195 }
1196 }
1197
1198 if (recid < 0)
1199 goto out;
1200
1201 snarf_user_data(setno);
1202
1203 /*
1204 * Initialize the md_nm_snarfed array
1205 * this array is indexed by the key and
1206 * is set by md_getdevnum during the snarf time
1207 */
1208 if ((nh = get_first_record(setno, 0, NM_NOTSHARED)) != NULL) {
1209 size = (int)((((struct nm_rec_hdr *)nh->nmn_record)->
1210 r_next_key) * (sizeof (int)));
1211 md_nm_snarfed = (int *)kmem_zalloc(size, KM_SLEEP);
1212 }
1213
1214 /*
1215 * go through and snarf until nothing gets added
1216 */
1217 do {
1218 i = 0;
1219 for (ops = md_opslist; ops != NULL; ops = ops->md_next) {
1220 if (ops->md_snarf != NULL) {
1221 retval = ops->md_snarf(MD_SNARF_DOIT, setno);
1222 if (retval == -1) {
1223 err = -1;
1224 /* Don't know the failed unit */
1225 (void) mdmderror(ep, MDE_RR_ALLOC_ERROR,
1226 0);
1227 (void) md_halt_set(setno, MD_HALT_ALL);
1228 (void) mddb_unload_set(setno);
1229 md_haltsnarf_exit(setno);
1230 return (err);
1231 } else {
1232 i += retval;
1233 }
1234 }
1235 }
1236 } while (i);
1237
1238 /*
1239 * Set the first available slot and availability
1240 */
1241 md_set[setno].s_un_avail = 0;
1242 for (un = 0; un < MD_MAXUNITS; un++) {
1243 if (md_set[setno].s_un[un] != NULL) {
1244 continue;
1245 } else {
1246 if (!un_next_set) {
1247 md_set[setno].s_un_next = un;
1248 un_next_set = 1;
1249 }
1250 md_set[setno].s_un_avail++;
1251 }
1252 }
1253
1254 md_set_setstatus(setno, MD_SET_SNARFED);
1255
1256 recid = mddb_makerecid(setno, 0);
1257 while ((recid = mddb_getnextrec(recid, MDDB_ALL, 0)) > 0) {
1258 privat = mddb_getrecprivate(recid);
1259 if (privat & MD_PRV_COMMIT) {
1260 if (mddb_commitrec(recid)) {
1261 if (!(md_get_setstatus(setno) & MD_SET_STALE)) {
1262 md_set_setstatus(setno, MD_SET_STALE);
1263 cmn_err(CE_WARN,
1264 "md: state database is stale");
1265 }
1266 }
1267 mddb_setrecprivate(recid, MD_PRV_GOTIT);
1268 }
1269 }
1270
1271 /* Deletes must happen after all the commits */
1272 recid = mddb_makerecid(setno, 0);
1273 while ((recid = mddb_getnextrec(recid, MDDB_ALL, 0)) > 0) {
1274 privat = mddb_getrecprivate(recid);
1275 if (privat & MD_PRV_DELETE) {
1276 if (mddb_deleterec(recid)) {
1277 if (!(md_get_setstatus(setno) & MD_SET_STALE)) {
1278 md_set_setstatus(setno, MD_SET_STALE);
1279 cmn_err(CE_WARN,
1280 "md: state database is stale");
1281 }
1282 mddb_setrecprivate(recid, MD_PRV_GOTIT);
1283 }
1284 recid = mddb_makerecid(setno, 0);
1285 }
1286 }
1287
1288 /*
1289 * go through and clean up records until nothing gets cleaned up.
1290 */
1291 do {
1292 i = 0;
1293 for (ops = md_opslist; ops != NULL; ops = ops->md_next)
1294 if (ops->md_snarf != NULL)
1295 i += ops->md_snarf(MD_SNARF_CLEANUP, setno);
1296 } while (i);
1297
1298 if (md_nm_snarfed != NULL &&
1299 !(md_get_setstatus(setno) & MD_SET_STALE)) {
1300 /*
1301 * go thru and cleanup the namespace and the device id
1302 * name space
1303 */
1304 for (key = 1;
1305 key < ((struct nm_rec_hdr *)nh->nmn_record)->r_next_key;
1306 key++) {
1307 /*
1308 * Is the entry an 'orphan'?
1309 */
1310 if (lookup_entry(nh, setno, side, key, NODEV64, 0L) !=
1311 NULL) {
1312 /*
1313 * If the value is not set then apparently
1314 * it is not part of the current configuration,
1315 * remove it this can happen when system panic
1316 * between the primary name space update and
1317 * the device id name space update
1318 */
1319 if (md_nm_snarfed[key] == 0) {
1320 if (md_verify_orphaned_record(setno,
1321 key) == 1)
1322 (void) remove_entry(nh,
1323 side, key, 0L);
1324 }
1325 }
1326 }
1327 }
1328
1329 if (md_nm_snarfed != NULL) {
1330 /*
1331 * Done and free the memory
1332 */
1333 kmem_free(md_nm_snarfed, size);
1334 md_nm_snarfed = NULL;
1335 }
1336
1337 if (s->s_lbp->lb_flags & MDDB_DEVID_STYLE &&
1338 !(md_get_setstatus(setno) & MD_SET_STALE)) {
1339 /*
1340 * if the destroy flag has been set and
1341 * the MD_SET_DIDCLUP bit is not set in
1342 * the set's status field, cleanup the
1343 * entire device id namespace
1344 */
1345 if (md_devid_destroy &&
1346 !(md_get_setstatus(setno) & MD_SET_DIDCLUP)) {
1347 (void) md_devid_cleanup(setno, 1);
1348 md_set_setstatus(setno, MD_SET_DIDCLUP);
1349 } else
1350 (void) md_devid_cleanup(setno, 0);
1351 }
1352
1353 /*
1354 * clear single threading on snarf, return success or error
1355 */
1356 out:
1357 md_haltsnarf_exit(setno);
1358 return (err);
1359 }
1360
1361 void
1362 get_minfo(struct dk_minfo *info, minor_t mnum)
1363 {
1364 md_unit_t *un;
1365 mdi_unit_t *ui;
1366
1367 info->dki_capacity = 0;
1368 info->dki_lbsize = 0;
1369 info->dki_media_type = 0;
1370
1371 if ((ui = MDI_UNIT(mnum)) == NULL) {
1372 return;
1373 }
1374 un = (md_unit_t *)md_unit_readerlock(ui);
1375 info->dki_capacity = un->c.un_total_blocks;
1376 md_unit_readerexit(ui);
1377 info->dki_lbsize = DEV_BSIZE;
1378 info->dki_media_type = DK_UNKNOWN;
1379 }
1380
1381
1382 void
1383 get_info(struct dk_cinfo *info, minor_t mnum)
1384 {
1385 /*
1386 * Controller Information
1387 */
1388 info->dki_ctype = DKC_MD;
1389 info->dki_cnum = ddi_get_instance(ddi_get_parent(md_devinfo));
1390 (void) strcpy(info->dki_cname,
1391 ddi_get_name(ddi_get_parent(md_devinfo)));
1392 /*
1393 * Unit Information
1394 */
1395 info->dki_unit = mnum;
1396 info->dki_slave = 0;
1397 (void) strcpy(info->dki_dname, ddi_driver_name(md_devinfo));
1398 info->dki_flags = 0;
1399 info->dki_partition = 0;
1400 info->dki_maxtransfer = (ushort_t)(md_maxphys / DEV_BSIZE);
1401
1402 /*
1403 * We can't get from here to there yet
1404 */
1405 info->dki_addr = 0;
1406 info->dki_space = 0;
1407 info->dki_prio = 0;
1408 info->dki_vec = 0;
1409 }
1410
1411 /*
1412 * open admin device
1413 */
1414 static int
1415 mdadminopen(
1416 int flag,
1417 int otyp)
1418 {
1419 int err = 0;
1420
1421 /* single thread */
1422 mutex_enter(&md_mx);
1423
1424 /* check type and flags */
1425 if ((otyp != OTYP_CHR) && (otyp != OTYP_LYR)) {
1426 err = EINVAL;
1427 goto out;
1428 }
1429 if (((flag & FEXCL) && (md_status & MD_GBL_OPEN)) ||
1430 (md_status & MD_GBL_EXCL)) {
1431 err = EBUSY;
1432 goto out;
1433 }
1434
1435 /* count and flag open */
1436 md_ocnt[otyp]++;
1437 md_status |= MD_GBL_OPEN;
1438 if (flag & FEXCL)
1439 md_status |= MD_GBL_EXCL;
1440
1441 /* unlock return success */
1442 out:
1443 mutex_exit(&md_mx);
1444 return (err);
1445 }
1446
1447 /*
1448 * open entry point
1449 */
1450 static int
1451 mdopen(
1452 dev_t *dev,
1453 int flag,
1454 int otyp,
1455 cred_t *cred_p)
1456 {
1457 minor_t mnum = getminor(*dev);
1458 unit_t unit = MD_MIN2UNIT(mnum);
1459 set_t setno = MD_MIN2SET(mnum);
1460 mdi_unit_t *ui = NULL;
1461 int err = 0;
1462 md_parent_t parent;
1463
1464 /* dispatch admin device opens */
1465 if (mnum == MD_ADM_MINOR)
1466 return (mdadminopen(flag, otyp));
1467
1468 /* lock, check status */
1469 rw_enter(&md_unit_array_rw.lock, RW_READER);
1470
1471 tryagain:
1472 if (md_get_status() & MD_GBL_HALTED) {
1473 err = ENODEV;
1474 goto out;
1475 }
1476
1477 /* check minor */
1478 if ((setno >= md_nsets) || (unit >= md_nunits)) {
1479 err = ENXIO;
1480 goto out;
1481 }
1482
1483 /* make sure we're snarfed */
1484 if ((md_get_setstatus(MD_LOCAL_SET) & MD_SET_SNARFED) == 0) {
1485 if (md_snarf_db_set(MD_LOCAL_SET, NULL) != 0) {
1486 err = ENODEV;
1487 goto out;
1488 }
1489 }
1490 if ((md_get_setstatus(setno) & MD_SET_SNARFED) == 0) {
1491 err = ENODEV;
1492 goto out;
1493 }
1494
1495 /* check unit */
1496 if ((ui = MDI_UNIT(mnum)) == NULL) {
1497 err = ENXIO;
1498 goto out;
1499 }
1500
1501 /*
1502 * The softpart open routine may do an I/O during the open, in
1503 * which case the open routine will set the OPENINPROGRESS flag
1504 * and drop all locks during the I/O. If this thread sees
1505 * the OPENINPROGRESS flag set, if should wait until the flag
1506 * is reset before calling the driver's open routine. It must
1507 * also revalidate the world after it grabs the unit_array lock
1508 * since the set may have been released or the metadevice cleared
1509 * during the sleep.
1510 */
1511 if (MD_MNSET_SETNO(setno)) {
1512 mutex_enter(&ui->ui_mx);
1513 if (ui->ui_lock & MD_UL_OPENINPROGRESS) {
1514 rw_exit(&md_unit_array_rw.lock);
1515 cv_wait(&ui->ui_cv, &ui->ui_mx);
1516 rw_enter(&md_unit_array_rw.lock, RW_READER);
1517 mutex_exit(&ui->ui_mx);
1518 goto tryagain;
1519 }
1520 mutex_exit(&ui->ui_mx);
1521 }
1522
1523 /* Test if device is openable */
1524 if ((ui->ui_tstate & MD_NOTOPENABLE) != 0) {
1525 err = ENXIO;
1526 goto out;
1527 }
1528
1529 /* don't allow opens w/WRITE flag if stale */
1530 if ((flag & FWRITE) && (md_get_setstatus(setno) & MD_SET_STALE)) {
1531 err = EROFS;
1532 goto out;
1533 }
1534
1535 /* don't allow writes to subdevices */
1536 parent = md_get_parent(md_expldev(*dev));
1537 if ((flag & FWRITE) && MD_HAS_PARENT(parent)) {
1538 err = EROFS;
1539 goto out;
1540 }
1541
1542 /* open underlying driver */
1543 if (md_ops[ui->ui_opsindex]->md_open != NULL) {
1544 if ((err = (*md_ops[ui->ui_opsindex]->md_open)
1545 (dev, flag, otyp, cred_p, 0)) != 0)
1546 goto out;
1547 }
1548
1549 /* or do it ourselves */
1550 else {
1551 /* single thread */
1552 (void) md_unit_openclose_enter(ui);
1553 err = md_unit_incopen(mnum, flag, otyp);
1554 md_unit_openclose_exit(ui);
1555 if (err != 0)
1556 goto out;
1557 }
1558
1559 /* unlock, return status */
1560 out:
1561 rw_exit(&md_unit_array_rw.lock);
1562 return (err);
1563 }
1564
1565 /*
1566 * close admin device
1567 */
1568 static int
1569 mdadminclose(
1570 int otyp)
1571 {
1572 int i;
1573 int err = 0;
1574
1575 /* single thread */
1576 mutex_enter(&md_mx);
1577
1578 /* check type and flags */
1579 if ((otyp < 0) || (otyp >= OTYPCNT)) {
1580 err = EINVAL;
1581 goto out;
1582 } else if (md_ocnt[otyp] == 0) {
1583 err = ENXIO;
1584 goto out;
1585 }
1586
1587 /* count and flag closed */
1588 if (otyp == OTYP_LYR)
1589 md_ocnt[otyp]--;
1590 else
1591 md_ocnt[otyp] = 0;
1592 md_status &= ~MD_GBL_OPEN;
1593 for (i = 0; (i < OTYPCNT); ++i)
1594 if (md_ocnt[i] != 0)
1595 md_status |= MD_GBL_OPEN;
1596 if (! (md_status & MD_GBL_OPEN))
1597 md_status &= ~MD_GBL_EXCL;
1598
1599 /* unlock return success */
1600 out:
1601 mutex_exit(&md_mx);
1602 return (err);
1603 }
1604
1605 /*
1606 * close entry point
1607 */
1608 static int
1609 mdclose(
1610 dev_t dev,
1611 int flag,
1612 int otyp,
1613 cred_t *cred_p)
1614 {
1615 minor_t mnum = getminor(dev);
1616 set_t setno = MD_MIN2SET(mnum);
1617 unit_t unit = MD_MIN2UNIT(mnum);
1618 mdi_unit_t *ui = NULL;
1619 int err = 0;
1620
1621 /* dispatch admin device closes */
1622 if (mnum == MD_ADM_MINOR)
1623 return (mdadminclose(otyp));
1624
1625 /* check minor */
1626 if ((setno >= md_nsets) || (unit >= md_nunits) ||
1627 ((ui = MDI_UNIT(mnum)) == NULL)) {
1628 err = ENXIO;
1629 goto out;
1630 }
1631
1632 /* close underlying driver */
1633 if (md_ops[ui->ui_opsindex]->md_close != NULL) {
1634 if ((err = (*md_ops[ui->ui_opsindex]->md_close)
1635 (dev, flag, otyp, cred_p, 0)) != 0)
1636 goto out;
1637 }
1638
1639 /* or do it ourselves */
1640 else {
1641 /* single thread */
1642 (void) md_unit_openclose_enter(ui);
1643 err = md_unit_decopen(mnum, otyp);
1644 md_unit_openclose_exit(ui);
1645 if (err != 0)
1646 goto out;
1647 }
1648
1649 /* return success */
1650 out:
1651 return (err);
1652 }
1653
1654
1655 /*
1656 * This routine performs raw read operations. It is called from the
1657 * device switch at normal priority.
1658 *
1659 * The main catch is that the *uio struct which is passed to us may
1660 * specify a read which spans two buffers, which would be contiguous
1661 * on a single partition, but not on a striped partition. This will
1662 * be handled by mdstrategy.
1663 */
1664 /*ARGSUSED*/
1665 static int
1666 mdread(dev_t dev, struct uio *uio, cred_t *credp)
1667 {
1668 minor_t mnum;
1669 mdi_unit_t *ui;
1670 int error;
1671
1672 if (((mnum = getminor(dev)) == MD_ADM_MINOR) ||
1673 (MD_MIN2SET(mnum) >= md_nsets) ||
1674 (MD_MIN2UNIT(mnum) >= md_nunits) ||
1675 ((ui = MDI_UNIT(mnum)) == NULL))
1676 return (ENXIO);
1677
1678 if (md_ops[ui->ui_opsindex]->md_read != NULL)
1679 return ((*md_ops[ui->ui_opsindex]->md_read)
1680 (dev, uio, credp));
1681
1682 if ((error = md_chk_uio(uio)) != 0)
1683 return (error);
1684
1685 return (physio(mdstrategy, NULL, dev, B_READ, md_minphys, uio));
1686 }
1687
1688 /*
1689 * This routine performs async raw read operations. It is called from the
1690 * device switch at normal priority.
1691 *
1692 * The main catch is that the *aio struct which is passed to us may
1693 * specify a read which spans two buffers, which would be contiguous
1694 * on a single partition, but not on a striped partition. This will
1695 * be handled by mdstrategy.
1696 */
1697 /*ARGSUSED*/
1698 static int
1699 mdaread(dev_t dev, struct aio_req *aio, cred_t *credp)
1700 {
1701 minor_t mnum;
1702 mdi_unit_t *ui;
1703 int error;
1704
1705
1706 if (((mnum = getminor(dev)) == MD_ADM_MINOR) ||
1707 (MD_MIN2SET(mnum) >= md_nsets) ||
1708 (MD_MIN2UNIT(mnum) >= md_nunits) ||
1709 ((ui = MDI_UNIT(mnum)) == NULL))
1710 return (ENXIO);
1711
1712 if (md_ops[ui->ui_opsindex]->md_aread != NULL)
1713 return ((*md_ops[ui->ui_opsindex]->md_aread)
1714 (dev, aio, credp));
1715
1716 if ((error = md_chk_uio(aio->aio_uio)) != 0)
1717 return (error);
1718
1719 return (aphysio(mdstrategy, anocancel, dev, B_READ, md_minphys, aio));
1720 }
1721
1722 /*
1723 * This routine performs raw write operations. It is called from the
1724 * device switch at normal priority.
1725 *
1726 * The main catch is that the *uio struct which is passed to us may
1727 * specify a write which spans two buffers, which would be contiguous
1728 * on a single partition, but not on a striped partition. This is
1729 * handled by mdstrategy.
1730 *
1731 */
1732 /*ARGSUSED*/
1733 static int
1734 mdwrite(dev_t dev, struct uio *uio, cred_t *credp)
1735 {
1736 minor_t mnum;
1737 mdi_unit_t *ui;
1738 int error;
1739
1740 if (((mnum = getminor(dev)) == MD_ADM_MINOR) ||
1741 (MD_MIN2SET(mnum) >= md_nsets) ||
1742 (MD_MIN2UNIT(mnum) >= md_nunits) ||
1743 ((ui = MDI_UNIT(mnum)) == NULL))
1744 return (ENXIO);
1745
1746 if (md_ops[ui->ui_opsindex]->md_write != NULL)
1747 return ((*md_ops[ui->ui_opsindex]->md_write)
1748 (dev, uio, credp));
1749
1750 if ((error = md_chk_uio(uio)) != 0)
1751 return (error);
1752
1753 return (physio(mdstrategy, NULL, dev, B_WRITE, md_minphys, uio));
1754 }
1755
1756 /*
1757 * This routine performs async raw write operations. It is called from the
1758 * device switch at normal priority.
1759 *
1760 * The main catch is that the *aio struct which is passed to us may
1761 * specify a write which spans two buffers, which would be contiguous
1762 * on a single partition, but not on a striped partition. This is
1763 * handled by mdstrategy.
1764 *
1765 */
1766 /*ARGSUSED*/
1767 static int
1768 mdawrite(dev_t dev, struct aio_req *aio, cred_t *credp)
1769 {
1770 minor_t mnum;
1771 mdi_unit_t *ui;
1772 int error;
1773
1774
1775 if (((mnum = getminor(dev)) == MD_ADM_MINOR) ||
1776 (MD_MIN2SET(mnum) >= md_nsets) ||
1777 (MD_MIN2UNIT(mnum) >= md_nunits) ||
1778 ((ui = MDI_UNIT(mnum)) == NULL))
1779 return (ENXIO);
1780
1781 if (md_ops[ui->ui_opsindex]->md_awrite != NULL)
1782 return ((*md_ops[ui->ui_opsindex]->md_awrite)
1783 (dev, aio, credp));
1784
1785 if ((error = md_chk_uio(aio->aio_uio)) != 0)
1786 return (error);
1787
1788 return (aphysio(mdstrategy, anocancel, dev, B_WRITE, md_minphys, aio));
1789 }
1790
1791 int
1792 mdstrategy(struct buf *bp)
1793 {
1794 minor_t mnum;
1795 mdi_unit_t *ui;
1796
1797 ASSERT((bp->b_flags & B_DONE) == 0);
1798
1799 if (panicstr)
1800 md_clr_status(MD_GBL_DAEMONS_LIVE);
1801
1802 if (((mnum = getminor(bp->b_edev)) == MD_ADM_MINOR) ||
1803 (MD_MIN2SET(mnum) >= md_nsets) ||
1804 (MD_MIN2UNIT(mnum) >= md_nunits) ||
1805 ((ui = MDI_UNIT(mnum)) == NULL)) {
1806 bp->b_flags |= B_ERROR;
1807 bp->b_error = ENXIO;
1808 bp->b_resid = bp->b_bcount;
1809 biodone(bp);
1810 return (0);
1811 }
1812
1813 bp->b_flags &= ~(B_ERROR | B_DONE);
1814 if (md_ops[ui->ui_opsindex]->md_strategy != NULL) {
1815 (*md_ops[ui->ui_opsindex]->md_strategy) (bp, 0, NULL);
1816 } else {
1817 (void) errdone(ui, bp, ENXIO);
1818 }
1819 return (0);
1820 }
1821
1822 /*
1823 * Return true if the ioctl is allowed to be multithreaded.
1824 * All the ioctls with MN are sent only from the message handlers through
1825 * rpc.mdcommd, which (via it's own locking mechanism) takes care that not two
1826 * ioctl for the same metadevice are issued at the same time.
1827 * So we are safe here.
1828 * The other ioctls do not mess with any metadevice structures and therefor
1829 * are harmless too, if called multiple times at the same time.
1830 */
1831 static boolean_t
1832 is_mt_ioctl(int cmd) {
1833
1834 switch (cmd) {
1835 case MD_IOCGUNIQMSGID:
1836 case MD_IOCGVERSION:
1837 case MD_IOCISOPEN:
1838 case MD_MN_SET_MM_OWNER:
1839 case MD_MN_SET_STATE:
1840 case MD_MN_SUSPEND_WRITES:
1841 case MD_MN_ALLOCATE_HOTSPARE:
1842 case MD_MN_SET_SETFLAGS:
1843 case MD_MN_GET_SETFLAGS:
1844 case MD_MN_MDDB_OPTRECFIX:
1845 case MD_MN_MDDB_PARSE:
1846 case MD_MN_MDDB_BLOCK:
1847 case MD_MN_DB_USERREQ:
1848 case MD_IOC_SPSTATUS:
1849 case MD_MN_COMMD_ERR:
1850 case MD_MN_SET_COMMD_RUNNING:
1851 case MD_MN_RESYNC:
1852 case MD_MN_SETSYNC:
1853 case MD_MN_POKE_HOTSPARES:
1854 case MD_MN_RR_DIRTY:
1855 case MD_MN_RR_CLEAN:
1856 case MD_MN_IOC_SPUPDATEWM:
1857 return (1);
1858 default:
1859 return (0);
1860 }
1861 }
1862
1863 /*
1864 * This routine implements the ioctl calls for the Virtual Disk System.
1865 * It is called from the device switch at normal priority.
1866 */
1867 /* ARGSUSED */
1868 static int
1869 mdioctl(dev_t dev, int cmd, intptr_t data, int mode, cred_t *cred_p,
1870 int *rval_p)
1871 {
1872 minor_t mnum = getminor(dev);
1873 mdi_unit_t *ui;
1874 IOLOCK lock;
1875 int err;
1876
1877 /*
1878 * For multinode disksets number of ioctls are allowed to be
1879 * multithreaded.
1880 * A fundamental assumption made in this implementation is that
1881 * ioctls either do not interact with other md structures or the
1882 * ioctl to the admin device can only occur if the metadevice
1883 * device is open. i.e. avoid a race between metaclear and the
1884 * progress of a multithreaded ioctl.
1885 */
1886
1887 if (!is_mt_ioctl(cmd) && md_ioctl_lock_enter() == EINTR) {
1888 return (EINTR);
1889 }
1890
1891 /*
1892 * initialize lock tracker
1893 */
1894 IOLOCK_INIT(&lock);
1895
1896 /* Flag to indicate that MD_GBL_IOCTL_LOCK is not acquired */
1897
1898 if (is_mt_ioctl(cmd)) {
1899 /* increment the md_mtioctl_cnt */
1900 mutex_enter(&md_mx);
1901 md_mtioctl_cnt++;
1902 mutex_exit(&md_mx);
1903 lock.l_flags |= MD_MT_IOCTL;
1904 }
1905
1906 /*
1907 * this has been added to prevent notification from re-snarfing
1908 * so metaunload will work. It may interfere with other modules
1909 * halt process.
1910 */
1911 if (md_get_status() & (MD_GBL_HALTED | MD_GBL_DAEMONS_DIE))
1912 return (IOLOCK_RETURN(ENXIO, &lock));
1913
1914 /*
1915 * admin device ioctls
1916 */
1917 if (mnum == MD_ADM_MINOR) {
1918 err = md_admin_ioctl(md_expldev(dev), cmd, (void *) data,
1919 mode, &lock);
1920 }
1921
1922 /*
1923 * metadevice ioctls
1924 */
1925 else if ((MD_MIN2SET(mnum) >= md_nsets) ||
1926 (MD_MIN2UNIT(mnum) >= md_nunits) ||
1927 (md_set[MD_MIN2SET(mnum)].s_ui == NULL) ||
1928 ((ui = MDI_UNIT(mnum)) == NULL)) {
1929 err = ENXIO;
1930 } else if (md_ops[ui->ui_opsindex]->md_ioctl == NULL) {
1931 err = ENOTTY;
1932 } else {
1933 err = (*md_ops[ui->ui_opsindex]->md_ioctl)
1934 (dev, cmd, (void *) data, mode, &lock);
1935 }
1936
1937 /*
1938 * drop any locks we grabbed
1939 */
1940 return (IOLOCK_RETURN_IOCTLEND(err, &lock));
1941 }
1942
1943 static int
1944 mddump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk)
1945 {
1946 minor_t mnum;
1947 set_t setno;
1948 mdi_unit_t *ui;
1949
1950 if ((mnum = getminor(dev)) == MD_ADM_MINOR)
1951 return (ENXIO);
1952
1953 setno = MD_MIN2SET(mnum);
1954
1955 if ((setno >= md_nsets) || (MD_MIN2UNIT(mnum) >= md_nunits) ||
1956 ((ui = MDI_UNIT(mnum)) == NULL))
1957 return (ENXIO);
1958
1959
1960 if ((md_get_setstatus(setno) & MD_SET_SNARFED) == 0)
1961 return (ENXIO);
1962
1963 if (md_ops[ui->ui_opsindex]->md_dump != NULL)
1964 return ((*md_ops[ui->ui_opsindex]->md_dump)
1965 (dev, addr, blkno, nblk));
1966
1967 return (ENXIO);
1968 }
1969
1970 /*
1971 * Metadevice unit number dispatcher
1972 * When this routine is called it will scan the
1973 * incore unit array and return the avail slot
1974 * hence the unit number to the caller
1975 *
1976 * Return -1 if there is nothing available
1977 */
1978 unit_t
1979 md_get_nextunit(set_t setno)
1980 {
1981 unit_t un, start;
1982
1983 /*
1984 * If nothing available
1985 */
1986 if (md_set[setno].s_un_avail == 0) {
1987 return (MD_UNITBAD);
1988 }
1989
1990 mutex_enter(&md_mx);
1991 start = un = md_set[setno].s_un_next;
1992
1993 /* LINTED: E_CONSTANT_CONDITION */
1994 while (1) {
1995 if (md_set[setno].s_un[un] == NULL) {
1996 /*
1997 * Advance the starting index for the next
1998 * md_get_nextunit call
1999 */
2000 if (un == MD_MAXUNITS - 1) {
2001 md_set[setno].s_un_next = 0;
2002 } else {
2003 md_set[setno].s_un_next = un + 1;
2004 }
2005 break;
2006 }
2007
2008 un = ((un == MD_MAXUNITS - 1) ? 0 : un + 1);
2009
2010 if (un == start) {
2011 un = MD_UNITBAD;
2012 break;
2013 }
2014
2015 }
2016
2017 mutex_exit(&md_mx);
2018 return (un);
2019 }
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