Merge from vendor branch OPENSSL:
[dragonfly.git] / sys / dev / disk / md / md.c
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 1.18 2007/09/05 05:28:32 dillon 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         struct disk_info info;
95
96         if (md_debug)
97                 kprintf("mdopen(%s %x %x)\n",
98                         devtoname(dev), ap->a_oflags, ap->a_devtype);
99
100         sc = dev->si_drv1;
101         if (sc->unit + 1 == mdunits)
102                 mdcreate_malloc();
103
104         bzero(&info, sizeof(info));
105         info.d_media_blksize = DEV_BSIZE;       /* mandatory */
106         info.d_media_blocks = sc->nsect;
107
108         info.d_secpertrack = 1024;              /* optional */
109         info.d_nheads = 1;
110         info.d_secpercyl = info.d_secpertrack * info.d_nheads;
111         info.d_ncylinders = (u_int)(info.d_media_blocks / info.d_secpercyl);
112         disk_setdiskinfo(&sc->disk, &info);
113
114         return (0);
115 }
116
117 static int
118 mdioctl(struct dev_ioctl_args *ap)
119 {
120         cdev_t dev = ap->a_head.a_dev;
121
122         if (md_debug)
123                 kprintf("mdioctl(%s %lx %p %x)\n",
124                         devtoname(dev), ap->a_cmd, ap->a_data, ap->a_fflag);
125
126         return (ENOIOCTL);
127 }
128
129 static int
130 mdstrategy(struct dev_strategy_args *ap)
131 {
132         cdev_t dev = ap->a_head.a_dev;
133         struct bio *bio = ap->a_bio;
134         struct buf *bp = bio->bio_buf;
135         struct md_s *sc;
136
137         if (md_debug > 1) {
138                 kprintf("mdstrategy(%p) %s %08x, %lld, %d, %p)\n",
139                     bp, devtoname(dev), bp->b_flags, bio->bio_offset, 
140                     bp->b_bcount, bp->b_data);
141         }
142         bio->bio_driver_info = dev;
143         sc = dev->si_drv1;
144         if (sc->type == MD_MALLOC) {
145                 mdstrategy_malloc(ap);
146         } else {
147                 mdstrategy_preload(ap);
148         }
149         return(0);
150 }
151
152
153 static int
154 mdstrategy_malloc(struct dev_strategy_args *ap)
155 {
156         cdev_t dev = ap->a_head.a_dev;
157         struct bio *bio = ap->a_bio;
158         struct buf *bp = bio->bio_buf;
159         unsigned secno, nsec, secval, uc;
160         u_char *secp, **secpp, *dst;
161         devstat_trans_flags dop;
162         struct md_s *sc;
163         int i;
164
165         if (md_debug > 1)
166                 kprintf("mdstrategy_malloc(%p) %s %08xx, %lld, %d, %p)\n",
167                     bp, devtoname(dev), bp->b_flags, bio->bio_offset, 
168                     bp->b_bcount, bp->b_data);
169
170         sc = dev->si_drv1;
171
172         crit_enter();
173
174         bioqdisksort(&sc->bio_queue, bio);
175
176         if (sc->busy) {
177                 crit_exit();
178                 return(0);
179         }
180
181         sc->busy++;
182         
183         while (1) {
184                 bio = bioq_first(&sc->bio_queue);
185                 if (bio == NULL) {
186                         crit_exit();
187                         break;
188                 }
189                 crit_exit();
190                 bioq_remove(&sc->bio_queue, bio);
191                 bp = bio->bio_buf;
192
193                 devstat_start_transaction(&sc->stats);
194
195                 switch(bp->b_cmd) {
196                 case BUF_CMD_FREEBLKS:
197                         dop = DEVSTAT_NO_DATA;
198                         break;
199                 case BUF_CMD_READ:
200                         dop = DEVSTAT_READ;
201                         break;
202                 case BUF_CMD_WRITE:
203                         dop = DEVSTAT_WRITE;
204                         break;
205                 default:
206                         panic("md: bad b_cmd %d", bp->b_cmd);
207                 }
208
209                 nsec = bp->b_bcount >> DEV_BSHIFT;
210                 secno = (unsigned)(bio->bio_offset >> DEV_BSHIFT);
211                 dst = bp->b_data;
212                 while (nsec--) {
213                         if (secno < sc->nsecp) {
214                                 secpp = &sc->secp[secno];
215                                 if ((u_int)*secpp > 255) {
216                                         secp = *secpp;
217                                         secval = 0;
218                                 } else {
219                                         secp = 0;
220                                         secval = (u_int) *secpp;
221                                 }
222                         } else {
223                                 secpp = 0;
224                                 secp = 0;
225                                 secval = 0;
226                         }
227                         if (md_debug > 2)
228                                 kprintf("%08x %p %p %d\n", bp->b_flags, secpp, secp, secval);
229
230                         switch(bp->b_cmd) {
231                         case BUF_CMD_FREEBLKS:
232                                 if (secpp) {
233                                         if (secp)
234                                                 FREE(secp, M_MDSECT);
235                                         *secpp = 0;
236                                 }
237                                 break;
238                         case BUF_CMD_READ:
239                                 if (secp) {
240                                         bcopy(secp, dst, DEV_BSIZE);
241                                 } else if (secval) {
242                                         for (i = 0; i < DEV_BSIZE; i++)
243                                                 dst[i] = secval;
244                                 } else {
245                                         bzero(dst, DEV_BSIZE);
246                                 }
247                                 break;
248                         case BUF_CMD_WRITE:
249                                 uc = dst[0];
250                                 for (i = 1; i < DEV_BSIZE; i++) 
251                                         if (dst[i] != uc)
252                                                 break;
253                                 if (i == DEV_BSIZE && !uc) {
254                                         if (secp)
255                                                 FREE(secp, M_MDSECT);
256                                         if (secpp)
257                                                 *secpp = (u_char *)uc;
258                                 } else {
259                                         if (!secpp) {
260                                                 MALLOC(secpp, u_char **, (secno + nsec + 1) * sizeof(u_char *), M_MD, M_WAITOK);
261                                                 bzero(secpp, (secno + nsec + 1) * sizeof(u_char *));
262                                                 bcopy(sc->secp, secpp, sc->nsecp * sizeof(u_char *));
263                                                 FREE(sc->secp, M_MD);
264                                                 sc->secp = secpp;
265                                                 sc->nsecp = secno + nsec + 1;
266                                                 secpp = &sc->secp[secno];
267                                         }
268                                         if (i == DEV_BSIZE) {
269                                                 if (secp)
270                                                         FREE(secp, M_MDSECT);
271                                                 *secpp = (u_char *)uc;
272                                         } else {
273                                                 if (!secp) 
274                                                         MALLOC(secp, u_char *, DEV_BSIZE, M_MDSECT, M_WAITOK);
275                                                 bcopy(dst, secp, DEV_BSIZE);
276
277                                                 *secpp = secp;
278                                         }
279                                 }
280                                 break;
281                         default:
282                                 panic("md: bad b_cmd %d", bp->b_cmd);
283
284                         }
285                         secno++;
286                         dst += DEV_BSIZE;
287                 }
288                 bp->b_resid = 0;
289                 devstat_end_transaction_buf(&sc->stats, bp);
290                 biodone(bio);
291                 crit_enter();
292         }
293         sc->busy = 0;
294         return(0);
295 }
296
297
298 static int
299 mdstrategy_preload(struct dev_strategy_args *ap)
300 {
301         cdev_t dev = ap->a_head.a_dev;
302         struct bio *bio = ap->a_bio;
303         struct buf *bp = bio->bio_buf;
304         devstat_trans_flags dop;
305         struct md_s *sc;
306
307         if (md_debug > 1)
308                 kprintf("mdstrategy_preload(%p) %s %08x, %lld, %d, %p)\n",
309                     bp, devtoname(dev), bp->b_flags, bio->bio_offset, 
310                     bp->b_bcount, bp->b_data);
311
312         sc = dev->si_drv1;
313
314         crit_enter();
315
316         bioqdisksort(&sc->bio_queue, bio);
317
318         if (sc->busy) {
319                 crit_exit();
320                 return(0);
321         }
322
323         sc->busy++;
324         
325         while (1) {
326                 bio = bioq_first(&sc->bio_queue);
327                 if (bio)
328                         bioq_remove(&sc->bio_queue, bio);
329                 crit_exit();
330                 if (bio == NULL)
331                         break;
332
333                 devstat_start_transaction(&sc->stats);
334
335                 switch(bp->b_cmd) {
336                 case BUF_CMD_FREEBLKS:
337                         dop = DEVSTAT_NO_DATA;
338                         break;
339                 case BUF_CMD_READ:
340                         dop = DEVSTAT_READ;
341                         bcopy(sc->pl_ptr + bio->bio_offset, 
342                                bp->b_data, bp->b_bcount);
343                         break;
344                 case BUF_CMD_WRITE:
345                         dop = DEVSTAT_WRITE;
346                         bcopy(bp->b_data, sc->pl_ptr + bio->bio_offset,
347                               bp->b_bcount);
348                         break;
349                 default:
350                         panic("md: bad cmd %d\n", bp->b_cmd);
351                 }
352                 bp->b_resid = 0;
353                 devstat_end_transaction_buf(&sc->stats, bp);
354                 biodone(bio);
355                 crit_enter();
356         }
357         sc->busy = 0;
358         return(0);
359 }
360
361 static struct md_s *
362 mdcreate(void)
363 {
364         struct md_s *sc;
365
366         MALLOC(sc, struct md_s *,sizeof(*sc), M_MD, M_WAITOK);
367         bzero(sc, sizeof(*sc));
368         sc->unit = mdunits++;
369         bioq_init(&sc->bio_queue);
370         devstat_add_entry(&sc->stats, "md", sc->unit, DEV_BSIZE,
371                 DEVSTAT_NO_ORDERED_TAGS, 
372                 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
373                 DEVSTAT_PRIORITY_OTHER);
374         sc->dev = disk_create(sc->unit, &sc->disk, &md_ops);
375         sc->dev->si_drv1 = sc;
376         sc->dev->si_iosize_max = DFLTPHYS;
377
378         return (sc);
379 }
380
381 static void
382 mdcreate_preload(u_char *image, unsigned length)
383 {
384         struct md_s *sc;
385
386         sc = mdcreate();
387         sc->type = MD_PRELOAD;
388         sc->nsect = length / DEV_BSIZE;
389         sc->pl_ptr = image;
390         sc->pl_len = length;
391
392         if (sc->unit == 0) 
393                 mdrootready = 1;
394 }
395
396 static void
397 mdcreate_malloc(void)
398 {
399         struct md_s *sc;
400
401         sc = mdcreate();
402         sc->type = MD_MALLOC;
403
404         sc->nsect = MD_NSECT;   /* for now */
405         MALLOC(sc->secp, u_char **, sizeof(u_char *), M_MD, M_WAITOK);
406         bzero(sc->secp, sizeof(u_char *));
407         sc->nsecp = 1;
408         kprintf("md%d: Malloc disk\n", sc->unit);
409 }
410
411 static void
412 md_drvinit(void *unused)
413 {
414
415         caddr_t mod;
416         caddr_t c;
417         u_char *ptr, *name, *type;
418         unsigned len;
419
420 #ifdef MD_ROOT_SIZE
421         mdcreate_preload(mfs_root, MD_ROOT_SIZE*1024);
422 #endif
423         mod = NULL;
424         while ((mod = preload_search_next_name(mod)) != NULL) {
425                 name = (char *)preload_search_info(mod, MODINFO_NAME);
426                 type = (char *)preload_search_info(mod, MODINFO_TYPE);
427                 if (name == NULL)
428                         continue;
429                 if (type == NULL)
430                         continue;
431                 if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
432                         continue;
433                 c = preload_search_info(mod, MODINFO_ADDR);
434                 ptr = *(u_char **)c;
435                 c = preload_search_info(mod, MODINFO_SIZE);
436                 len = *(unsigned *)c;
437                 kprintf("md%d: Preloaded image <%s> %d bytes at %p\n",
438                    mdunits, name, len, ptr);
439                 mdcreate_preload(ptr, len);
440         } 
441         mdcreate_malloc();
442 }
443
444 SYSINIT(mddev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR, md_drvinit,NULL)
445
446 #ifdef MD_ROOT
447 static void
448 md_takeroot(void *junk)
449 {
450         if (mdrootready)
451                 rootdevnames[0] = "ufs:/dev/md0c";
452 }
453
454 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL);
455 #endif