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ifconfig(8): Fix IPv6 CIDR parsing error for wgaip (wg allowed-ip)
[dragonfly.git] / sys / dev / disk / md / md.c
blob9b4ea63114e5c3346ed01f9df43ef5dc4bf9a76d
1 /*
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 *
9 * $FreeBSD: src/sys/dev/md/md.c,v 1.8.2.2 2002/08/19 17:43:34 jdp Exp $
10 *
11 */
12
13 #include "opt_md.h" /* We have adopted some tasks from MFS */
14
15 #include <sys/param.h>
16 #include <sys/systm.h>
17 #include <sys/buf.h>
18 #include <sys/conf.h>
19 #include <sys/devicestat.h>
20 #include <sys/disk.h>
21 #include <sys/kernel.h>
22 #include <sys/malloc.h>
23 #include <sys/sysctl.h>
24 #include <sys/linker.h>
25 #include <sys/proc.h>
26 #include <sys/buf2.h>
27 #include <sys/thread2.h>
28 #include <sys/queue.h>
29 #include <sys/udev.h>
30
31 #ifndef MD_NSECT
32 #define MD_NSECT (10000 * 2)
33 #endif
34
35 MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk");
36 MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors");
37
38 static int md_debug;
39 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0,
40 "Enable debug output for memory disk devices");
41
42 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
43 /* Image gets put here: */
44 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here";
45 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here";
46 #endif
47
48 static int mdrootready;
49
50 static d_strategy_t mdstrategy;
51 static d_strategy_t mdstrategy_preload;
52 static d_strategy_t mdstrategy_malloc;
53 static d_open_t mdopen;
54 static d_close_t mdclose;
55 static d_ioctl_t mdioctl;
56
57 static struct dev_ops md_ops = {
58 { "md", 0, D_DISK | D_CANFREE | D_MEMDISK | D_TRACKCLOSE | D_MPSAFE},
59 .d_open = mdopen,
60 .d_close = mdclose,
61 .d_read = physread,
62 .d_write = physwrite,
63 .d_ioctl = mdioctl,
64 .d_strategy = mdstrategy,
65 };
66
67 struct md_s {
68 struct lwkt_token tok;
69 int unit;
70 struct devstat stats;
71 struct bio_queue_head bio_queue;
72 struct disk disk;
73 cdev_t dev;
74 int busy;
75 enum { /* Memory disk type */
76 MD_MALLOC,
77 MD_PRELOAD
78 } type;
79 unsigned nsect;
80
81 /* MD_MALLOC related fields */
82 unsigned nsecp;
83 u_char **secp;
84
85 /* MD_PRELOAD related fields */
86 u_char *pl_ptr;
87 unsigned pl_len;
88 TAILQ_ENTRY(md_s) link;
89 };
90 TAILQ_HEAD(mdshead, md_s) mdlist = TAILQ_HEAD_INITIALIZER(mdlist);
91
92 static int mdunits;
93 static int refcnt;
94
95 static struct md_s *mdcreate(unsigned);
96 static void mdcreate_malloc(void);
97 static int mdinit(module_t, int, void *);
98 static void md_drvinit(void *);
99 static int md_drvcleanup(void);
100
101 static int
102 mdinit(module_t mod, int cmd, void *arg)
103 {
104 int ret = 0;
105
106 switch(cmd) {
107 case MOD_LOAD:
108 TAILQ_INIT(&mdlist);
109 md_drvinit(NULL);
110 break;
111 case MOD_UNLOAD:
112 ret = md_drvcleanup();
113 break;
114 default:
115 ret = EINVAL;
116 break;
117 }
118
119 return (ret);
120 }
121
122 static int
123 mdopen(struct dev_open_args *ap)
124 {
125 cdev_t dev = ap->a_head.a_dev;
126 struct md_s *sc;
127
128 if (md_debug) {
129 kprintf("mdopen(%s %x %x)\n",
130 devtoname(dev), ap->a_oflags, ap->a_devtype);
131 }
132
133 sc = dev->si_drv1;
134 lwkt_gettoken(&sc->tok);
135 if (sc->unit + 1 == mdunits)
136 mdcreate_malloc();
137 atomic_add_int(&refcnt, 1);
138 lwkt_reltoken(&sc->tok);
139
140 return (0);
141 }
142
143 static int
144 mdclose(struct dev_close_args *ap)
145 {
146 cdev_t dev = ap->a_head.a_dev;
147 struct md_s *sc;
148
149 if (md_debug) {
150 kprintf("mdclose(%s %x %x)\n",
151 devtoname(dev), ap->a_fflag, ap->a_devtype);
152 }
153 sc = dev->si_drv1;
154 lwkt_gettoken(&sc->tok);
155 atomic_add_int(&refcnt, -1);
156 lwkt_reltoken(&sc->tok);
157
158 return (0);
159 }
160
161 static int
162 mdioctl(struct dev_ioctl_args *ap)
163 {
164 cdev_t dev = ap->a_head.a_dev;
165
166 if (md_debug) {
167 kprintf("mdioctl(%s %lx %p %x)\n",
168 devtoname(dev), ap->a_cmd, ap->a_data, ap->a_fflag);
169 }
170
171 return (ENOIOCTL);
172 }
173
174 static int
175 mdstrategy(struct dev_strategy_args *ap)
176 {
177 cdev_t dev = ap->a_head.a_dev;
178 struct bio *bio = ap->a_bio;
179 struct buf *bp = bio->bio_buf;
180 struct md_s *sc;
181
182 if (md_debug > 1) {
183 kprintf("mdstrategy(%p) %s %08x, %lld, %d, %p)\n",
184 bp, devtoname(dev), bp->b_flags,
185 (long long)bio->bio_offset,
186 bp->b_bcount, bp->b_data);
187 }
188 bio->bio_driver_info = dev;
189 sc = dev->si_drv1;
190 lwkt_gettoken(&sc->tok);
191 if (sc->type == MD_MALLOC) {
192 mdstrategy_malloc(ap);
193 } else {
194 mdstrategy_preload(ap);
195 }
196 lwkt_reltoken(&sc->tok);
197 return(0);
198 }
199
200
201 static int
202 mdstrategy_malloc(struct dev_strategy_args *ap)
203 {
204 cdev_t dev = ap->a_head.a_dev;
205 struct bio *bio = ap->a_bio;
206 struct buf *bp = bio->bio_buf;
207 unsigned secno, nsec, secval, uc;
208 u_char *secp, **secpp, *dst;
209 struct md_s *sc;
210 int i;
211
212 if (md_debug > 1)
213 kprintf("mdstrategy_malloc(%p) %s %08xx, %lld, %d, %p)\n",
214 bp, devtoname(dev), bp->b_flags,
215 (long long)bio->bio_offset,
216 bp->b_bcount, bp->b_data);
217
218 sc = dev->si_drv1;
219
220 crit_enter();
221
222 bioqdisksort(&sc->bio_queue, bio);
223
224 if (sc->busy) {
225 crit_exit();
226 return(0);
227 }
228
229 sc->busy++;
230
231 while (1) {
232 bio = bioq_first(&sc->bio_queue);
233 if (bio == NULL) {
234 crit_exit();
235 break;
236 }
237 crit_exit();
238 bioq_remove(&sc->bio_queue, bio);
239 bp = bio->bio_buf;
240
241 devstat_start_transaction(&sc->stats);
242
243 switch (bp->b_cmd) {
244 case BUF_CMD_FREEBLKS:
245 case BUF_CMD_READ:
246 case BUF_CMD_WRITE:
247 break;
248 default:
249 panic("md: bad b_cmd %d", bp->b_cmd);
250 }
251
252 nsec = bp->b_bcount >> DEV_BSHIFT;
253 secno = (unsigned)(bio->bio_offset >> DEV_BSHIFT);
254 dst = bp->b_data;
255 while (nsec--) {
256 if (secno < sc->nsecp) {
257 secpp = &sc->secp[secno];
258 if ((u_int)(uintptr_t)*secpp > 255) {
259 secp = *secpp;
260 secval = 0;
261 } else {
262 secp = NULL;
263 secval = (u_int)(uintptr_t)*secpp;
264 }
265 } else {
266 secpp = NULL;
267 secp = NULL;
268 secval = 0;
269 }
270 if (md_debug > 2)
271 kprintf("%08x %p %p %d\n", bp->b_flags, secpp, secp, secval);
272
273 switch (bp->b_cmd) {
274 case BUF_CMD_FREEBLKS:
275 if (secpp) {
276 if (secp)
277 kfree(secp, M_MDSECT);
278 *secpp = NULL;
279 }
280 break;
281 case BUF_CMD_READ:
282 if (secp) {
283 bcopy(secp, dst, DEV_BSIZE);
284 } else if (secval) {
285 for (i = 0; i < DEV_BSIZE; i++)
286 dst[i] = secval;
287 } else {
288 bzero(dst, DEV_BSIZE);
289 }
290 break;
291 case BUF_CMD_WRITE:
292 uc = dst[0];
293 for (i = 1; i < DEV_BSIZE; i++)
294 if (dst[i] != uc)
295 break;
296 if (i == DEV_BSIZE && !uc) {
297 if (secp)
298 kfree(secp, M_MDSECT);
299 if (secpp)
300 *secpp = (u_char *)(uintptr_t)uc;
301 } else {
302 if (!secpp) {
303 secpp = kmalloc((secno + nsec + 1) * sizeof(u_char *),
304 M_MD,
305 M_WAITOK | M_ZERO);
306 bcopy(sc->secp, secpp, sc->nsecp * sizeof(u_char *));
307 kfree(sc->secp, M_MD);
308 sc->secp = secpp;
309 sc->nsecp = secno + nsec + 1;
310 secpp = &sc->secp[secno];
311 }
312 if (i == DEV_BSIZE) {
313 if (secp)
314 kfree(secp, M_MDSECT);
315 *secpp = (u_char *)(uintptr_t)uc;
316 } else {
317 if (!secp)
318 secp = kmalloc(DEV_BSIZE,
319 M_MDSECT,
320 M_WAITOK);
321 bcopy(dst, secp, DEV_BSIZE);
322
323 *secpp = secp;
324 }
325 }
326 break;
327 default:
328 panic("md: bad b_cmd %d", bp->b_cmd);
329
330 }
331 secno++;
332 dst += DEV_BSIZE;
333 }
334 bp->b_resid = 0;
335 devstat_end_transaction_buf(&sc->stats, bp);
336 biodone(bio);
337 crit_enter();
338 }
339 sc->busy = 0;
340 return(0);
341 }
342
343
344 static int
345 mdstrategy_preload(struct dev_strategy_args *ap)
346 {
347 cdev_t dev = ap->a_head.a_dev;
348 struct bio *bio = ap->a_bio;
349 struct buf *bp = bio->bio_buf;
350 struct md_s *sc;
351
352 if (md_debug > 1)
353 kprintf("mdstrategy_preload(%p) %s %08x, %lld, %d, %p)\n",
354 bp, devtoname(dev), bp->b_flags,
355 (long long)bio->bio_offset,
356 bp->b_bcount, bp->b_data);
357
358 sc = dev->si_drv1;
359
360 crit_enter();
361
362 bioqdisksort(&sc->bio_queue, bio);
363
364 if (sc->busy) {
365 crit_exit();
366 return(0);
367 }
368
369 sc->busy++;
370
371 while (1) {
372 bio = bioq_takefirst(&sc->bio_queue);
373 crit_exit();
374 if (bio == NULL)
375 break;
376
377 devstat_start_transaction(&sc->stats);
378
379 switch (bp->b_cmd) {
380 case BUF_CMD_FREEBLKS:
381 break;
382 case BUF_CMD_READ:
383 bcopy(sc->pl_ptr + bio->bio_offset,
384 bp->b_data, bp->b_bcount);
385 break;
386 case BUF_CMD_WRITE:
387 bcopy(bp->b_data, sc->pl_ptr + bio->bio_offset,
388 bp->b_bcount);
389 break;
390 default:
391 panic("md: bad cmd %d", bp->b_cmd);
392 }
393 bp->b_resid = 0;
394 devstat_end_transaction_buf(&sc->stats, bp);
395 biodone(bio);
396 crit_enter();
397 }
398 sc->busy = 0;
399 return(0);
400 }
401
402 static struct md_s *
403 mdcreate(unsigned length)
404 {
405 struct md_s *sc;
406 struct disk_info info;
407
408 sc = kmalloc(sizeof(*sc), M_MD, M_WAITOK | M_ZERO);
409 lwkt_token_init(&sc->tok, "md");
410 sc->unit = mdunits++;
411 bioq_init(&sc->bio_queue);
412 devstat_add_entry(&sc->stats, "md", sc->unit, DEV_BSIZE,
413 DEVSTAT_NO_ORDERED_TAGS,
414 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
415 DEVSTAT_PRIORITY_OTHER);
416 sc->dev = disk_create(sc->unit, &sc->disk, &md_ops);
417 sc->dev->si_drv1 = sc;
418 sc->dev->si_iosize_max = MAXPHYS;
419 disk_setdisktype(&sc->disk, "memory");
420
421 bzero(&info, sizeof(info));
422 info.d_media_blksize = DEV_BSIZE; /* mandatory */
423 info.d_media_blocks = length / DEV_BSIZE;
424
425 info.d_secpertrack = 1024; /* optional */
426 info.d_nheads = 1;
427 info.d_secpercyl = info.d_secpertrack * info.d_nheads;
428 info.d_ncylinders = (u_int)(info.d_media_blocks / info.d_secpercyl);
429 disk_setdiskinfo(&sc->disk, &info);
430 TAILQ_INSERT_HEAD(&mdlist, sc, link);
431
432 return (sc);
433 }
434
435
436 static void
437 mdcreate_preload(u_char *image, unsigned length)
438 {
439 struct md_s *sc;
440
441 sc = mdcreate(length);
442 sc->type = MD_PRELOAD;
443 sc->nsect = length / DEV_BSIZE;
444 sc->pl_ptr = image;
445 sc->pl_len = length;
446
447 if (sc->unit == 0)
448 mdrootready = 1;
449 }
450
451 static void
452 mdcreate_malloc(void)
453 {
454 struct md_s *sc;
455
456 sc = mdcreate(MD_NSECT*DEV_BSIZE);
457 sc->type = MD_MALLOC;
458
459 sc->nsect = MD_NSECT; /* for now */
460 sc->secp = kmalloc(sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
461 sc->nsecp = 1;
462 kprintf("md%d: Malloc disk\n", sc->unit);
463 }
464
465 static int
466 md_drvcleanup(void)
467 {
468
469 int secno;
470 struct md_s *sc, *sc_temp;
471
472 if (atomic_fetchadd_int(&refcnt, 0) != 0)
473 return EBUSY;
474
475 /*
476 * Go through all the md devices, freeing up all the
477 * memory allocated for sectors, and the md_s struct
478 * itself.
479 */
480 TAILQ_FOREACH_MUTABLE(sc, &mdlist, link, sc_temp) {
481 for (secno = 0; secno < sc->nsecp; secno++) {
482 if ((u_int)(uintptr_t)sc->secp[secno] > 255)
483 kfree(sc->secp[secno], M_MDSECT);
484 }
485
486 if (sc->dev != NULL)
487 disk_destroy(&sc->disk);
488
489 devstat_remove_entry(&sc->stats);
490 TAILQ_REMOVE(&mdlist, sc, link);
491
492 kfree(sc->secp, M_MD);
493 kfree(sc, M_MD);
494 }
495
496 return 0;
497
498 }
499
500 static void
501 md_drvinit(void *unused)
502 {
503
504 caddr_t mod;
505 caddr_t c;
506 u_char *ptr, *name, *type;
507 unsigned len;
508
509 #ifdef MD_ROOT_SIZE
510 mdcreate_preload(mfs_root, MD_ROOT_SIZE*1024);
511 #endif
512 mod = NULL;
513 while ((mod = preload_search_next_name(mod)) != NULL) {
514 name = (char *)preload_search_info(mod, MODINFO_NAME);
515 type = (char *)preload_search_info(mod, MODINFO_TYPE);
516 if (name == NULL)
517 continue;
518 if (type == NULL)
519 continue;
520 if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
521 continue;
522 c = preload_search_info(mod, MODINFO_ADDR);
523 ptr = *(u_char **)c;
524 c = preload_search_info(mod, MODINFO_SIZE);
525 len = *(unsigned *)c;
526 kprintf("md%d: Preloaded image <%s> %d bytes at %p\n",
527 mdunits, name, len, ptr);
528 mdcreate_preload(ptr, len);
529 }
530 mdcreate_malloc();
531 }
532
533 DEV_MODULE(md, mdinit, NULL);
534
535 #ifdef MD_ROOT
536 static void
537 md_takeroot(void *junk)
538 {
539 if (mdrootready)
540 rootdevnames[0] = "ufs:/dev/md0s0";
541 }
542
543 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL);
544 #endif
DragonFly BSD