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md - when setdiskinfo, also set no of blocks
[dragonfly.git] / sys / dev / disk / md / md.c
blob210137de3abbb7f6dd38d8f4ad622bb9a7af86ff
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 * $DragonFly: src/sys/dev/disk/md/md.c,v 1.20 2008/09/07 08:09:39 swildner Exp $
11 *
12 */
13
14 #include "opt_md.h" /* We have adopted some tasks from MFS */
15
16 #include <sys/param.h>
17 #include <sys/systm.h>
18 #include <sys/buf.h>
19 #include <sys/conf.h>
20 #include <sys/devicestat.h>
21 #include <sys/disk.h>
22 #include <sys/kernel.h>
23 #include <sys/malloc.h>
24 #include <sys/sysctl.h>
25 #include <sys/linker.h>
26 #include <sys/proc.h>
27 #include <sys/buf2.h>
28 #include <sys/thread2.h>
29
30 #ifndef MD_NSECT
31 #define MD_NSECT (10000 * 2)
32 #endif
33
34 MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk");
35 MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors");
36
37 static int md_debug;
38 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, "");
39
40 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
41 /* Image gets put here: */
42 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here";
43 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here";
44 #endif
45
46 static int mdrootready;
47
48 static void mdcreate_malloc(void);
49
50 #define CDEV_MAJOR 95
51
52 static d_strategy_t mdstrategy;
53 static d_strategy_t mdstrategy_preload;
54 static d_strategy_t mdstrategy_malloc;
55 static d_open_t mdopen;
56 static d_ioctl_t mdioctl;
57
58 static struct dev_ops md_ops = {
59 { "md", CDEV_MAJOR, D_DISK | D_CANFREE | D_MEMDISK },
60 .d_open = mdopen,
61 .d_close = nullclose,
62 .d_read = physread,
63 .d_write = physwrite,
64 .d_ioctl = mdioctl,
65 .d_strategy = mdstrategy,
66 };
67
68 struct md_s {
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 {MD_MALLOC, MD_PRELOAD} type;
76 unsigned nsect;
77
78 /* MD_MALLOC related fields */
79 unsigned nsecp;
80 u_char **secp;
81
82 /* MD_PRELOAD related fields */
83 u_char *pl_ptr;
84 unsigned pl_len;
85 };
86
87 static int mdunits;
88
89 static int
90 mdopen(struct dev_open_args *ap)
91 {
92 cdev_t dev = ap->a_head.a_dev;
93 struct md_s *sc;
94 #if 0
95 struct disk_info info;
96 #endif
97
98 if (md_debug)
99 kprintf("mdopen(%s %x %x)\n",
100 devtoname(dev), ap->a_oflags, ap->a_devtype);
101
102 sc = dev->si_drv1;
103 if (sc->unit + 1 == mdunits)
104 mdcreate_malloc();
105 #if 0
106 bzero(&info, sizeof(info));
107 info.d_media_blksize = DEV_BSIZE; /* mandatory */
108 info.d_media_blocks = sc->nsect;
109
110 info.d_secpertrack = 1024; /* optional */
111 info.d_nheads = 1;
112 info.d_secpercyl = info.d_secpertrack * info.d_nheads;
113 info.d_ncylinders = (u_int)(info.d_media_blocks / info.d_secpercyl);
114 disk_setdiskinfo(&sc->disk, &info);
115 #endif
116 return (0);
117 }
118
119 static int
120 mdioctl(struct dev_ioctl_args *ap)
121 {
122 cdev_t dev = ap->a_head.a_dev;
123
124 if (md_debug)
125 kprintf("mdioctl(%s %lx %p %x)\n",
126 devtoname(dev), ap->a_cmd, ap->a_data, ap->a_fflag);
127
128 return (ENOIOCTL);
129 }
130
131 static int
132 mdstrategy(struct dev_strategy_args *ap)
133 {
134 cdev_t dev = ap->a_head.a_dev;
135 struct bio *bio = ap->a_bio;
136 struct buf *bp = bio->bio_buf;
137 struct md_s *sc;
138
139 if (md_debug > 1) {
140 kprintf("mdstrategy(%p) %s %08x, %lld, %d, %p)\n",
141 bp, devtoname(dev), bp->b_flags,
142 (long long)bio->bio_offset,
143 bp->b_bcount, bp->b_data);
144 }
145 bio->bio_driver_info = dev;
146 sc = dev->si_drv1;
147 if (sc->type == MD_MALLOC) {
148 mdstrategy_malloc(ap);
149 } else {
150 mdstrategy_preload(ap);
151 }
152 return(0);
153 }
154
155
156 static int
157 mdstrategy_malloc(struct dev_strategy_args *ap)
158 {
159 cdev_t dev = ap->a_head.a_dev;
160 struct bio *bio = ap->a_bio;
161 struct buf *bp = bio->bio_buf;
162 unsigned secno, nsec, secval, uc;
163 u_char *secp, **secpp, *dst;
164 struct md_s *sc;
165 int i;
166
167 if (md_debug > 1)
168 kprintf("mdstrategy_malloc(%p) %s %08xx, %lld, %d, %p)\n",
169 bp, devtoname(dev), bp->b_flags,
170 (long long)bio->bio_offset,
171 bp->b_bcount, bp->b_data);
172
173 sc = dev->si_drv1;
174
175 crit_enter();
176
177 bioqdisksort(&sc->bio_queue, bio);
178
179 if (sc->busy) {
180 crit_exit();
181 return(0);
182 }
183
184 sc->busy++;
185
186 while (1) {
187 bio = bioq_first(&sc->bio_queue);
188 if (bio == NULL) {
189 crit_exit();
190 break;
191 }
192 crit_exit();
193 bioq_remove(&sc->bio_queue, bio);
194 bp = bio->bio_buf;
195
196 devstat_start_transaction(&sc->stats);
197
198 switch (bp->b_cmd) {
199 case BUF_CMD_FREEBLKS:
200 case BUF_CMD_READ:
201 case BUF_CMD_WRITE:
202 break;
203 default:
204 panic("md: bad b_cmd %d", bp->b_cmd);
205 }
206
207 nsec = bp->b_bcount >> DEV_BSHIFT;
208 secno = (unsigned)(bio->bio_offset >> DEV_BSHIFT);
209 dst = bp->b_data;
210 while (nsec--) {
211 if (secno < sc->nsecp) {
212 secpp = &sc->secp[secno];
213 if ((u_int)(uintptr_t)*secpp > 255) {
214 secp = *secpp;
215 secval = 0;
216 } else {
217 secp = 0;
218 secval = (u_int)(uintptr_t)*secpp;
219 }
220 } else {
221 secpp = 0;
222 secp = 0;
223 secval = 0;
224 }
225 if (md_debug > 2)
226 kprintf("%08x %p %p %d\n", bp->b_flags, secpp, secp, secval);
227
228 switch (bp->b_cmd) {
229 case BUF_CMD_FREEBLKS:
230 if (secpp) {
231 if (secp)
232 FREE(secp, M_MDSECT);
233 *secpp = 0;
234 }
235 break;
236 case BUF_CMD_READ:
237 if (secp) {
238 bcopy(secp, dst, DEV_BSIZE);
239 } else if (secval) {
240 for (i = 0; i < DEV_BSIZE; i++)
241 dst[i] = secval;
242 } else {
243 bzero(dst, DEV_BSIZE);
244 }
245 break;
246 case BUF_CMD_WRITE:
247 uc = dst[0];
248 for (i = 1; i < DEV_BSIZE; i++)
249 if (dst[i] != uc)
250 break;
251 if (i == DEV_BSIZE && !uc) {
252 if (secp)
253 FREE(secp, M_MDSECT);
254 if (secpp)
255 *secpp = (u_char *)(uintptr_t)uc;
256 } else {
257 if (!secpp) {
258 MALLOC(secpp, u_char **, (secno + nsec + 1) * sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
259 bcopy(sc->secp, secpp, sc->nsecp * sizeof(u_char *));
260 FREE(sc->secp, M_MD);
261 sc->secp = secpp;
262 sc->nsecp = secno + nsec + 1;
263 secpp = &sc->secp[secno];
264 }
265 if (i == DEV_BSIZE) {
266 if (secp)
267 FREE(secp, M_MDSECT);
268 *secpp = (u_char *)(uintptr_t)uc;
269 } else {
270 if (!secp)
271 MALLOC(secp, u_char *, DEV_BSIZE, M_MDSECT, M_WAITOK);
272 bcopy(dst, secp, DEV_BSIZE);
273
274 *secpp = secp;
275 }
276 }
277 break;
278 default:
279 panic("md: bad b_cmd %d", bp->b_cmd);
280
281 }
282 secno++;
283 dst += DEV_BSIZE;
284 }
285 bp->b_resid = 0;
286 devstat_end_transaction_buf(&sc->stats, bp);
287 biodone(bio);
288 crit_enter();
289 }
290 sc->busy = 0;
291 return(0);
292 }
293
294
295 static int
296 mdstrategy_preload(struct dev_strategy_args *ap)
297 {
298 cdev_t dev = ap->a_head.a_dev;
299 struct bio *bio = ap->a_bio;
300 struct buf *bp = bio->bio_buf;
301 struct md_s *sc;
302
303 if (md_debug > 1)
304 kprintf("mdstrategy_preload(%p) %s %08x, %lld, %d, %p)\n",
305 bp, devtoname(dev), bp->b_flags,
306 (long long)bio->bio_offset,
307 bp->b_bcount, bp->b_data);
308
309 sc = dev->si_drv1;
310
311 crit_enter();
312
313 bioqdisksort(&sc->bio_queue, bio);
314
315 if (sc->busy) {
316 crit_exit();
317 return(0);
318 }
319
320 sc->busy++;
321
322 while (1) {
323 bio = bioq_first(&sc->bio_queue);
324 if (bio)
325 bioq_remove(&sc->bio_queue, bio);
326 crit_exit();
327 if (bio == NULL)
328 break;
329
330 devstat_start_transaction(&sc->stats);
331
332 switch (bp->b_cmd) {
333 case BUF_CMD_FREEBLKS:
334 break;
335 case BUF_CMD_READ:
336 bcopy(sc->pl_ptr + bio->bio_offset,
337 bp->b_data, bp->b_bcount);
338 break;
339 case BUF_CMD_WRITE:
340 bcopy(bp->b_data, sc->pl_ptr + bio->bio_offset,
341 bp->b_bcount);
342 break;
343 default:
344 panic("md: bad cmd %d\n", bp->b_cmd);
345 }
346 bp->b_resid = 0;
347 devstat_end_transaction_buf(&sc->stats, bp);
348 biodone(bio);
349 crit_enter();
350 }
351 sc->busy = 0;
352 return(0);
353 }
354
355 static struct md_s *
356 mdcreate(unsigned length)
357 {
358 struct md_s *sc;
359 struct disk_info info;
360
361 MALLOC(sc, struct md_s *,sizeof(*sc), M_MD, M_WAITOK | M_ZERO);
362 sc->unit = mdunits++;
363 bioq_init(&sc->bio_queue);
364 devstat_add_entry(&sc->stats, "md", sc->unit, DEV_BSIZE,
365 DEVSTAT_NO_ORDERED_TAGS,
366 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
367 DEVSTAT_PRIORITY_OTHER);
368 sc->dev = disk_create(sc->unit, &sc->disk, &md_ops);
369 sc->dev->si_drv1 = sc;
370 sc->dev->si_iosize_max = DFLTPHYS;
371
372 bzero(&info, sizeof(info));
373 info.d_media_blksize = DEV_BSIZE; /* mandatory */
374 info.d_media_blocks = length / DEV_BSIZE;
375
376 info.d_secpertrack = 1024; /* optional */
377 info.d_nheads = 1;
378 info.d_secpercyl = info.d_secpertrack * info.d_nheads;
379 info.d_ncylinders = (u_int)(info.d_media_blocks / info.d_secpercyl);
380 disk_setdiskinfo(&sc->disk, &info);
381
382 return (sc);
383 }
384
385 static void
386 mdcreate_preload(u_char *image, unsigned length)
387 {
388 struct md_s *sc;
389
390 sc = mdcreate(length);
391 sc->type = MD_PRELOAD;
392 sc->nsect = length / DEV_BSIZE;
393 sc->pl_ptr = image;
394 sc->pl_len = length;
395
396 if (sc->unit == 0)
397 mdrootready = 1;
398 }
399
400 static void
401 mdcreate_malloc(void)
402 {
403 struct md_s *sc;
404
405 sc = mdcreate(0);
406 sc->type = MD_MALLOC;
407
408 sc->nsect = MD_NSECT; /* for now */
409 MALLOC(sc->secp, u_char **, sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
410 sc->nsecp = 1;
411 kprintf("md%d: Malloc disk\n", sc->unit);
412 }
413
414 static void
415 md_drvinit(void *unused)
416 {
417
418 caddr_t mod;
419 caddr_t c;
420 u_char *ptr, *name, *type;
421 unsigned len;
422
423 #ifdef MD_ROOT_SIZE
424 mdcreate_preload(mfs_root, MD_ROOT_SIZE*1024);
425 #endif
426 mod = NULL;
427 while ((mod = preload_search_next_name(mod)) != NULL) {
428 name = (char *)preload_search_info(mod, MODINFO_NAME);
429 type = (char *)preload_search_info(mod, MODINFO_TYPE);
430 if (name == NULL)
431 continue;
432 if (type == NULL)
433 continue;
434 if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
435 continue;
436 c = preload_search_info(mod, MODINFO_ADDR);
437 ptr = *(u_char **)c;
438 c = preload_search_info(mod, MODINFO_SIZE);
439 len = *(unsigned *)c;
440 kprintf("md%d: Preloaded image <%s> %d bytes at %p\n",
441 mdunits, name, len, ptr);
442 mdcreate_preload(ptr, len);
443 }
444 mdcreate_malloc();
445 }
446
447 SYSINIT(mddev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR, md_drvinit,NULL)
448
449 #ifdef MD_ROOT
450 static void
451 md_takeroot(void *junk)
452 {
453 if (mdrootready)
454 rootdevnames[0] = "ufs:/dev/md0s0";
455 }
456
457 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL);
458 #endif
DragonFly BSD