Change the kernel dev_t, representing a pointer to a specinfo structure,
[dragonfly.git] / sys / dev / raid / vinum / vinum.c
CommitLineData
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1/*-
2 * Copyright (c) 1997, 1998
3 * Nan Yang Computer Services Limited. All rights reserved.
4 *
5 * Written by Greg Lehey
6 *
7 * This software is distributed under the so-called ``Berkeley
8 * License'':
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Nan Yang Computer
21 * Services Limited.
22 * 4. Neither the name of the Company nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * This software is provided ``as is'', and any express or implied
27 * warranties, including, but not limited to, the implied warranties of
28 * merchantability and fitness for a particular purpose are disclaimed.
29 * In no event shall the company or contributors be liable for any
30 * direct, indirect, incidental, special, exemplary, or consequential
31 * damages (including, but not limited to, procurement of substitute
32 * goods or services; loss of use, data, or profits; or business
33 * interruption) however caused and on any theory of liability, whether
34 * in contract, strict liability, or tort (including negligence or
35 * otherwise) arising in any way out of the use of this software, even if
36 * advised of the possibility of such damage.
37 *
38 * $Id: vinum.c,v 1.33 2001/01/09 06:19:15 grog Exp grog $
39 * $FreeBSD: src/sys/dev/vinum/vinum.c,v 1.38.2.3 2003/01/07 12:14:16 joerg Exp $
b13267a5 40 * $DragonFly: src/sys/dev/raid/vinum/vinum.c,v 1.18 2006/09/10 01:26:36 dillon Exp $
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41 */
42
43#define STATIC static /* nothing while we're testing XXX */
44
1f2de5d4 45#include "vinumhdr.h"
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46#include <sys/sysproto.h> /* for sync(2) */
47#include <sys/devicestat.h>
48#ifdef VINUMDEBUG
49#include <sys/reboot.h>
50int debug = 0;
51extern int total_malloced;
52extern int malloccount;
53extern struct mc malloced[];
54#endif
1f2de5d4 55#include "request.h"
984263bc 56
fef8985e 57struct dev_ops vinum_ops =
984263bc 58{
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59 { "vinum", VINUM_CDEV_MAJOR, D_DISK },
60 .d_open = vinumopen,
61 .d_close = vinumclose,
62 .d_read = physread,
63 .d_write = physwrite,
64 .d_ioctl = vinumioctl,
65 .d_poll = vinumpoll,
66 .d_strategy = vinumstrategy,
67 .d_dump = vinumdump,
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68};
69
70/* Called by main() during pseudo-device attachment. */
71STATIC void vinumattach(void *);
72
73STATIC int vinum_modevent(module_t mod, modeventtype_t type, void *unused);
74
75struct _vinum_conf vinum_conf; /* configuration information */
76
77/*
78 * Called by main() during pseudo-device attachment. All we need
79 * to do is allocate enough space for devices to be configured later, and
80 * add devsw entries.
81 */
82void
83vinumattach(void *dummy)
84{
85 char *cp, *cp1, *cp2, **drives;
86 int i, rv;
87 struct volume *vol;
88
89 /* modload should prevent multiple loads, so this is worth a panic */
90 if ((vinum_conf.flags & VF_LOADED) != 0)
91 panic("vinum: already loaded");
92
93 log(LOG_INFO, "vinum: loaded\n");
94 vinum_conf.flags |= VF_LOADED; /* we're loaded now */
95
96 daemonq = NULL; /* initialize daemon's work queue */
97 dqend = NULL;
98
fef8985e 99 dev_ops_add(&vinum_ops, 0, 0); /* add the ops entry */
984263bc 100
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101 vinum_conf.physbufs = nswbuf / 2 + 1; /* maximum amount of physical bufs */
102
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103 /* allocate space: drives... */
104 DRIVE = (struct drive *) Malloc(sizeof(struct drive) * INITIAL_DRIVES);
105 CHECKALLOC(DRIVE, "vinum: no memory\n");
106 bzero(DRIVE, sizeof(struct drive) * INITIAL_DRIVES);
107 vinum_conf.drives_allocated = INITIAL_DRIVES; /* number of drive slots allocated */
108 vinum_conf.drives_used = 0; /* and number in use */
109
110 /* volumes, ... */
111 VOL = (struct volume *) Malloc(sizeof(struct volume) * INITIAL_VOLUMES);
112 CHECKALLOC(VOL, "vinum: no memory\n");
113 bzero(VOL, sizeof(struct volume) * INITIAL_VOLUMES);
114 vinum_conf.volumes_allocated = INITIAL_VOLUMES; /* number of volume slots allocated */
115 vinum_conf.volumes_used = 0; /* and number in use */
116
117 /* plexes, ... */
118 PLEX = (struct plex *) Malloc(sizeof(struct plex) * INITIAL_PLEXES);
119 CHECKALLOC(PLEX, "vinum: no memory\n");
120 bzero(PLEX, sizeof(struct plex) * INITIAL_PLEXES);
121 vinum_conf.plexes_allocated = INITIAL_PLEXES; /* number of plex slots allocated */
122 vinum_conf.plexes_used = 0; /* and number in use */
123
124 /* and subdisks */
125 SD = (struct sd *) Malloc(sizeof(struct sd) * INITIAL_SUBDISKS);
126 CHECKALLOC(SD, "vinum: no memory\n");
127 bzero(SD, sizeof(struct sd) * INITIAL_SUBDISKS);
128 vinum_conf.subdisks_allocated = INITIAL_SUBDISKS; /* number of sd slots allocated */
129 vinum_conf.subdisks_used = 0; /* and number in use */
130
131 /*
132 * See if the loader has passed us a disk to
133 * read the initial configuration from.
134 */
bc01a404 135 if ((cp = kgetenv("vinum.drives")) != NULL) {
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136 for (cp1 = cp, i = 0, drives = 0; *cp1 != '\0'; i++) {
137 cp2 = cp1;
138 while (*cp1 != '\0' && *cp1 != ',' && *cp1 != ' ')
139 cp1++;
140 if (*cp1 != '\0')
141 *cp1++ = '\0';
77652cad 142 drives = krealloc(drives, (unsigned long)((i + 1) * sizeof(char *)),
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143 M_TEMP, M_WAITOK);
144 drives[i] = cp2;
145 }
146 if (i == 0)
147 goto bailout;
148 rv = vinum_scandisk(drives, i);
149 if (rv)
150 log(LOG_NOTICE, "vinum_scandisk() returned %d", rv);
151 bailout:
efda3bd0 152 kfree(drives, M_TEMP);
984263bc 153 }
bc01a404 154 if ((cp = kgetenv("vinum.root")) != NULL) {
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155 for (i = 0; i < vinum_conf.volumes_used; i++) {
156 vol = &vinum_conf.volume[i];
157 if ((vol->state == volume_up)
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158 && (strcmp (vol->name, cp) == 0)
159 ) {
fef8985e 160 rootdev = make_dev(&vinum_ops, i, UID_ROOT, GID_OPERATOR,
e4c9c0c8 161 0640, "vinum");
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162 log(LOG_INFO, "vinum: using volume %s for root device\n", cp);
163 break;
164 }
165 }
166 }
167}
168
169/*
170 * Check if we have anything open. If confopen is != 0,
171 * that goes for the super device as well, otherwise
172 * only for volumes.
173 *
174 * Return 0 if not inactive, 1 if inactive.
175 */
176int
177vinum_inactive(int confopen)
178{
179 int i;
180 int can_do = 1; /* assume we can do it */
181
182 if (confopen && (vinum_conf.flags & VF_OPEN)) /* open by vinum(8)? */
183 return 0; /* can't do it while we're open */
184 lock_config();
185 for (i = 0; i < vinum_conf.volumes_allocated; i++) {
186 if ((VOL[i].state > volume_down)
187 && (VOL[i].flags & VF_OPEN)) { /* volume is open */
188 can_do = 0;
189 break;
190 }
191 }
192 unlock_config();
193 return can_do;
194}
195
196/*
197 * Free all structures.
198 * If cleardrive is 0, save the configuration; otherwise
199 * remove the configuration from the drive.
200 *
201 * Before coming here, ensure that no volumes are open.
202 */
203void
204free_vinum(int cleardrive)
205{
206 int i;
207 int drives_allocated = vinum_conf.drives_allocated;
208
209 if (DRIVE != NULL) {
210 if (cleardrive) { /* remove the vinum config */
211 for (i = 0; i < drives_allocated; i++)
212 remove_drive(i); /* remove the drive */
213 } else { /* keep the config */
214 for (i = 0; i < drives_allocated; i++)
215 free_drive(&DRIVE[i]); /* close files and things */
216 }
217 Free(DRIVE);
218 }
219 while ((vinum_conf.flags & (VF_STOPPING | VF_DAEMONOPEN))
220 == (VF_STOPPING | VF_DAEMONOPEN)) { /* at least one daemon open, we're stopping */
221 queue_daemon_request(daemonrq_return, (union daemoninfo) 0); /* stop the daemon */
377d4740 222 tsleep(&vinumclose, 0, "vstop", 1); /* and wait for it */
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223 }
224 if (SD != NULL)
225 Free(SD);
226 if (PLEX != NULL) {
227 for (i = 0; i < vinum_conf.plexes_allocated; i++) {
228 struct plex *plex = &vinum_conf.plex[i];
229
230 if (plex->state != plex_unallocated) { /* we have real data there */
231 if (plex->sdnos)
232 Free(plex->sdnos);
233 }
234 }
235 Free(PLEX);
236 }
237 if (VOL != NULL)
238 Free(VOL);
239 bzero(&vinum_conf, sizeof(vinum_conf));
240}
241
242STATIC int
243vinum_modevent(module_t mod, modeventtype_t type, void *unused)
244{
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245 switch (type) {
246 case MOD_LOAD:
247 vinumattach(NULL);
248 return 0; /* OK */
249 case MOD_UNLOAD:
250 if (!vinum_inactive(1)) /* is anything open? */
251 return EBUSY; /* yes, we can't do it */
252 vinum_conf.flags |= VF_STOPPING; /* note that we want to stop */
753fd850 253 sys_sync(NULL); /* write out buffers */
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254 free_vinum(0); /* clean up */
255#ifdef VINUMDEBUG
256 if (total_malloced) {
257 int i;
258#ifdef INVARIANTS
259 int *poke;
260#endif
261
262 for (i = 0; i < malloccount; i++) {
263 if (debug & DEBUG_WARNINGS) /* want to hear about them */
264 log(LOG_WARNING,
265 "vinum: exiting with %d bytes malloced from %s:%d\n",
266 malloced[i].size,
267 malloced[i].file,
268 malloced[i].line);
269#ifdef INVARIANTS
270 poke = &((int *) malloced[i].address)
271 [malloced[i].size / (2 * sizeof(int))]; /* middle of the area */
272 if (*poke == 0xdeadc0de) /* already freed */
273 log(LOG_ERR,
274 "vinum: exiting with malloc table inconsistency at %p from %s:%d\n",
275 malloced[i].address,
276 malloced[i].file,
277 malloced[i].line);
278#endif
279 Free(malloced[i].address);
280 }
281 }
282#endif
fef8985e 283 dev_ops_remove(&vinum_ops, 0, 0);
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284 log(LOG_INFO, "vinum: unloaded\n"); /* tell the world */
285 return 0;
286 default:
287 break;
288 }
289 return 0;
290}
291
292moduledata_t vinum_mod =
293{
294 "vinum",
295 (modeventhand_t) vinum_modevent,
296 0
297};
5dbaf12c 298DECLARE_MODULE(vinum, vinum_mod, SI_SUB_RAID, SI_ORDER_MIDDLE);
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299
300/* ARGSUSED */
301/* Open a vinum object */
302int
fef8985e 303vinumopen(struct dev_open_args *ap)
984263bc 304{
b13267a5 305 cdev_t dev = ap->a_head.a_dev;
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306 int error;
307 unsigned int index;
308 struct volume *vol;
309 struct plex *plex;
310 struct sd *sd;
311 int devminor; /* minor number */
312
313 devminor = minor(dev);
314 error = 0;
315 /* First, decide what we're looking at */
316 switch (DEVTYPE(dev)) {
317 case VINUM_VOLUME_TYPE:
318 index = Volno(dev);
319 if (index >= vinum_conf.volumes_allocated)
320 return ENXIO; /* no such device */
321 vol = &VOL[index];
322
323 switch (vol->state) {
324 case volume_unallocated:
325 case volume_uninit:
326 return ENXIO;
327
328 case volume_up:
329 vol->flags |= VF_OPEN; /* note we're open */
330 return 0;
331
332 case volume_down:
333 return EIO;
334
335 default:
336 return EINVAL;
337 }
338
339 case VINUM_PLEX_TYPE:
340 if (Volno(dev) >= vinum_conf.volumes_allocated)
341 return ENXIO;
342 /* FALLTHROUGH */
343
344 case VINUM_RAWPLEX_TYPE:
345 index = Plexno(dev); /* get plex index in vinum_conf */
346 if (index >= vinum_conf.plexes_allocated)
347 return ENXIO; /* no such device */
348 plex = &PLEX[index];
349
350 switch (plex->state) {
351 case plex_referenced:
352 case plex_unallocated:
353 return EINVAL;
354
355 default:
356 plex->flags |= VF_OPEN; /* note we're open */
357 return 0;
358 }
359
360 case VINUM_SD_TYPE:
361 if ((Volno(dev) >= vinum_conf.volumes_allocated) /* no such volume */
362 ||(Plexno(dev) >= vinum_conf.plexes_allocated)) /* or no such plex */
363 return ENXIO; /* no such device */
364
365 /* FALLTHROUGH */
366
367 case VINUM_RAWSD_TYPE:
368 index = Sdno(dev); /* get the subdisk number */
369 if ((index >= vinum_conf.subdisks_allocated) /* not a valid SD entry */
370 ||(SD[index].state < sd_init)) /* or SD is not real */
371 return ENXIO; /* no such device */
372 sd = &SD[index];
373
374 /*
375 * Opening a subdisk is always a special operation, so we
376 * ignore the state as long as it represents a real subdisk
377 */
378 switch (sd->state) {
379 case sd_unallocated:
380 case sd_uninit:
381 return EINVAL;
382
383 default:
384 sd->flags |= VF_OPEN; /* note we're open */
385 return 0;
386 }
387
388 case VINUM_SUPERDEV_TYPE:
fef8985e 389 error = suser_cred(ap->a_cred, 0); /* are we root? */
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390 if (error == 0) { /* yes, can do */
391 if (devminor == VINUM_DAEMON_DEV) /* daemon device */
392 vinum_conf.flags |= VF_DAEMONOPEN; /* we're open */
393 else if (devminor == VINUM_SUPERDEV)
394 vinum_conf.flags |= VF_OPEN; /* we're open */
395 else
396 error = ENODEV; /* nothing, maybe a debug mismatch */
397 }
398 return error;
399
400 /* Vinum drives are disks. We already have a disk
401 * driver, so don't handle them here */
402 case VINUM_DRIVE_TYPE:
403 default:
404 return ENODEV; /* don't know what to do with these */
405 }
406}
407
408/* ARGSUSED */
409int
fef8985e 410vinumclose(struct dev_close_args *ap)
984263bc 411{
b13267a5 412 cdev_t dev = ap->a_head.a_dev;
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413 unsigned int index;
414 struct volume *vol;
415 int devminor;
416
417 devminor = minor(dev);
418 index = Volno(dev);
419 /* First, decide what we're looking at */
420 switch (DEVTYPE(dev)) {
421 case VINUM_VOLUME_TYPE:
422 if (index >= vinum_conf.volumes_allocated)
423 return ENXIO; /* no such device */
424 vol = &VOL[index];
425
426 switch (vol->state) {
427 case volume_unallocated:
428 case volume_uninit:
429 return ENXIO;
430
431 case volume_up:
432 vol->flags &= ~VF_OPEN; /* reset our flags */
433 return 0;
434
435 case volume_down:
436 return EIO;
437
438 default:
439 return EINVAL;
440 }
441
442 case VINUM_PLEX_TYPE:
443 if (Volno(dev) >= vinum_conf.volumes_allocated)
444 return ENXIO;
445 /* FALLTHROUGH */
446
447 case VINUM_RAWPLEX_TYPE:
448 index = Plexno(dev); /* get plex index in vinum_conf */
449 if (index >= vinum_conf.plexes_allocated)
450 return ENXIO; /* no such device */
451 PLEX[index].flags &= ~VF_OPEN; /* reset our flags */
452 return 0;
453
454 case VINUM_SD_TYPE:
455 if ((Volno(dev) >= vinum_conf.volumes_allocated) || /* no such volume */
456 (Plexno(dev) >= vinum_conf.plexes_allocated)) /* or no such plex */
457 return ENXIO; /* no such device */
458 /* FALLTHROUGH */
459
460 case VINUM_RAWSD_TYPE:
461 index = Sdno(dev); /* get the subdisk number */
462 if (index >= vinum_conf.subdisks_allocated)
463 return ENXIO; /* no such device */
464 SD[index].flags &= ~VF_OPEN; /* reset our flags */
465 return 0;
466
467 case VINUM_SUPERDEV_TYPE:
468 /*
469 * don't worry about whether we're root:
470 * nobody else would get this far.
471 */
472 if (devminor == VINUM_SUPERDEV) /* normal superdev */
473 vinum_conf.flags &= ~VF_OPEN; /* no longer open */
474 else if (devminor == VINUM_DAEMON_DEV) { /* the daemon device */
475 vinum_conf.flags &= ~VF_DAEMONOPEN; /* no longer open */
476 if (vinum_conf.flags & VF_STOPPING) /* we're stopping, */
477 wakeup(&vinumclose); /* we can continue stopping now */
478 }
479 return 0;
480
481 case VINUM_DRIVE_TYPE:
482 default:
483 return ENODEV; /* don't know what to do with these */
484 }
485}
486
487/* size routine */
488int
fef8985e 489vinumsize(struct dev_psize_args *ap)
984263bc 490{
b13267a5 491 cdev_t dev = ap->a_head.a_dev;
984263bc 492 struct volume *vol;
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493
494 vol = &VOL[Volno(dev)];
495
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496 if (vol->state == volume_up) {
497 ap->a_result = vol->size;
498 return(0);
499 } else {
500 return(ENXIO);
501 }
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502}
503
504int
fef8985e 505vinumdump(struct dev_dump_args *ap)
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506{
507 /* Not implemented. */
508 return ENXIO;
509}
510
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511int
512vinumpoll(struct dev_poll_args *ap)
513{
514 ap->a_events = seltrue(ap->a_head.a_dev, ap->a_events);
515 return(0);
516}
517
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518/* Local Variables: */
519/* fill-column: 50 */
520/* End: */