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 * ----------------------------------------------------------------------------
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 $
14 #include "opt_md.h" /* We have adopted some tasks from MFS */
16 #include <sys/param.h>
17 #include <sys/systm.h>
20 #include <sys/devicestat.h>
22 #include <sys/kernel.h>
23 #include <sys/malloc.h>
24 #include <sys/sysctl.h>
25 #include <sys/linker.h>
28 #include <sys/thread2.h>
31 #define MD_NSECT (10000 * 2)
34 MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk");
35 MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors");
38 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, "");
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";
46 static int mdrootready;
48 static void mdcreate_malloc(void);
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;
58 static struct dev_ops md_ops = {
59 { "md", CDEV_MAJOR, D_DISK | D_CANFREE | D_MEMDISK },
65 .d_strategy = mdstrategy,
71 struct bio_queue_head bio_queue;
75 enum {MD_MALLOC, MD_PRELOAD} type;
78 /* MD_MALLOC related fields */
82 /* MD_PRELOAD related fields */
90 mdopen(struct dev_open_args *ap)
92 cdev_t dev = ap->a_head.a_dev;
94 struct disk_info info;
97 kprintf("mdopen(%s %x %x)\n",
98 devtoname(dev), ap->a_oflags, ap->a_devtype);
101 if (sc->unit + 1 == mdunits)
104 bzero(&info, sizeof(info));
105 info.d_media_blksize = DEV_BSIZE; /* mandatory */
106 info.d_media_blocks = sc->nsect;
108 info.d_secpertrack = 1024; /* optional */
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);
118 mdioctl(struct dev_ioctl_args *ap)
120 cdev_t dev = ap->a_head.a_dev;
123 kprintf("mdioctl(%s %lx %p %x)\n",
124 devtoname(dev), ap->a_cmd, ap->a_data, ap->a_fflag);
130 mdstrategy(struct dev_strategy_args *ap)
132 cdev_t dev = ap->a_head.a_dev;
133 struct bio *bio = ap->a_bio;
134 struct buf *bp = bio->bio_buf;
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);
142 bio->bio_driver_info = dev;
144 if (sc->type == MD_MALLOC) {
145 mdstrategy_malloc(ap);
147 mdstrategy_preload(ap);
154 mdstrategy_malloc(struct dev_strategy_args *ap)
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;
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);
174 bioqdisksort(&sc->bio_queue, bio);
184 bio = bioq_first(&sc->bio_queue);
190 bioq_remove(&sc->bio_queue, bio);
193 devstat_start_transaction(&sc->stats);
196 case BUF_CMD_FREEBLKS:
197 dop = DEVSTAT_NO_DATA;
206 panic("md: bad b_cmd %d", bp->b_cmd);
209 nsec = bp->b_bcount >> DEV_BSHIFT;
210 secno = (unsigned)(bio->bio_offset >> DEV_BSHIFT);
213 if (secno < sc->nsecp) {
214 secpp = &sc->secp[secno];
215 if ((u_int)*secpp > 255) {
220 secval = (u_int) *secpp;
228 kprintf("%08x %p %p %d\n", bp->b_flags, secpp, secp, secval);
231 case BUF_CMD_FREEBLKS:
234 FREE(secp, M_MDSECT);
240 bcopy(secp, dst, DEV_BSIZE);
242 for (i = 0; i < DEV_BSIZE; i++)
245 bzero(dst, DEV_BSIZE);
250 for (i = 1; i < DEV_BSIZE; i++)
253 if (i == DEV_BSIZE && !uc) {
255 FREE(secp, M_MDSECT);
257 *secpp = (u_char *)uc;
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);
265 sc->nsecp = secno + nsec + 1;
266 secpp = &sc->secp[secno];
268 if (i == DEV_BSIZE) {
270 FREE(secp, M_MDSECT);
271 *secpp = (u_char *)uc;
274 MALLOC(secp, u_char *, DEV_BSIZE, M_MDSECT, M_WAITOK);
275 bcopy(dst, secp, DEV_BSIZE);
282 panic("md: bad b_cmd %d", bp->b_cmd);
289 devstat_end_transaction_buf(&sc->stats, bp);
299 mdstrategy_preload(struct dev_strategy_args *ap)
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;
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);
316 bioqdisksort(&sc->bio_queue, bio);
326 bio = bioq_first(&sc->bio_queue);
328 bioq_remove(&sc->bio_queue, bio);
333 devstat_start_transaction(&sc->stats);
336 case BUF_CMD_FREEBLKS:
337 dop = DEVSTAT_NO_DATA;
341 bcopy(sc->pl_ptr + bio->bio_offset,
342 bp->b_data, bp->b_bcount);
346 bcopy(bp->b_data, sc->pl_ptr + bio->bio_offset,
350 panic("md: bad cmd %d\n", bp->b_cmd);
353 devstat_end_transaction_buf(&sc->stats, bp);
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;
382 mdcreate_preload(u_char *image, unsigned length)
387 sc->type = MD_PRELOAD;
388 sc->nsect = length / DEV_BSIZE;
397 mdcreate_malloc(void)
402 sc->type = MD_MALLOC;
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 *));
408 kprintf("md%d: Malloc disk\n", sc->unit);
412 md_drvinit(void *unused)
417 u_char *ptr, *name, *type;
421 mdcreate_preload(mfs_root, MD_ROOT_SIZE*1024);
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);
431 if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
433 c = preload_search_info(mod, MODINFO_ADDR);
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);
444 SYSINIT(mddev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR, md_drvinit,NULL)
448 md_takeroot(void *junk)
451 rootdevnames[0] = "ufs:/dev/md0c";
454 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL);