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 $
13 #include "opt_md.h" /* We have adopted some tasks from MFS */
15 #include <sys/param.h>
16 #include <sys/systm.h>
19 #include <sys/devicestat.h>
21 #include <sys/kernel.h>
22 #include <sys/malloc.h>
23 #include <sys/sysctl.h>
24 #include <sys/linker.h>
27 #include <sys/thread2.h>
28 #include <sys/queue.h>
32 #define MD_NSECT (10000 * 2)
35 MALLOC_DEFINE(M_MD, "MD disk", "Memory Disk");
36 MALLOC_DEFINE(M_MDSECT, "MD sectors", "Memory Disk Sectors");
39 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, "");
41 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
42 /* Image gets put here: */
43 static u_char mfs_root[MD_ROOT_SIZE*1024] = "MFS Filesystem goes here";
44 static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here";
47 static int mdrootready;
49 static d_strategy_t mdstrategy;
50 static d_strategy_t mdstrategy_preload;
51 static d_strategy_t mdstrategy_malloc;
52 static d_open_t mdopen;
53 static d_close_t mdclose;
54 static d_ioctl_t mdioctl;
56 static struct dev_ops md_ops = {
57 { "md", 0, D_DISK | D_CANFREE | D_MEMDISK | D_TRACKCLOSE},
63 .d_strategy = mdstrategy,
69 struct bio_queue_head bio_queue;
73 enum { /* Memory disk type */
79 /* MD_MALLOC related fields */
83 /* MD_PRELOAD related fields */
86 TAILQ_ENTRY(md_s) link;
88 TAILQ_HEAD(mdshead, md_s) mdlist = TAILQ_HEAD_INITIALIZER(mdlist);
93 static struct md_s *mdcreate(unsigned);
94 static void mdcreate_malloc(void);
95 static int mdinit(module_t, int, void *);
96 static void md_drvinit(void *);
97 static int md_drvcleanup(void);
100 mdinit(module_t mod, int cmd, void *arg)
110 ret = md_drvcleanup();
121 mdopen(struct dev_open_args *ap)
123 cdev_t dev = ap->a_head.a_dev;
127 kprintf("mdopen(%s %x %x)\n",
128 devtoname(dev), ap->a_oflags, ap->a_devtype);
131 if (sc->unit + 1 == mdunits)
134 atomic_add_int(&refcnt, 1);
139 mdclose(struct dev_close_args *ap)
141 cdev_t dev = ap->a_head.a_dev;
145 kprintf("mdclose(%s %x %x)\n",
146 devtoname(dev), ap->a_fflag, ap->a_devtype);
148 atomic_add_int(&refcnt, -1);
154 mdioctl(struct dev_ioctl_args *ap)
156 cdev_t dev = ap->a_head.a_dev;
159 kprintf("mdioctl(%s %lx %p %x)\n",
160 devtoname(dev), ap->a_cmd, ap->a_data, ap->a_fflag);
166 mdstrategy(struct dev_strategy_args *ap)
168 cdev_t dev = ap->a_head.a_dev;
169 struct bio *bio = ap->a_bio;
170 struct buf *bp = bio->bio_buf;
174 kprintf("mdstrategy(%p) %s %08x, %lld, %d, %p)\n",
175 bp, devtoname(dev), bp->b_flags,
176 (long long)bio->bio_offset,
177 bp->b_bcount, bp->b_data);
179 bio->bio_driver_info = dev;
181 if (sc->type == MD_MALLOC) {
182 mdstrategy_malloc(ap);
184 mdstrategy_preload(ap);
191 mdstrategy_malloc(struct dev_strategy_args *ap)
193 cdev_t dev = ap->a_head.a_dev;
194 struct bio *bio = ap->a_bio;
195 struct buf *bp = bio->bio_buf;
196 unsigned secno, nsec, secval, uc;
197 u_char *secp, **secpp, *dst;
202 kprintf("mdstrategy_malloc(%p) %s %08xx, %lld, %d, %p)\n",
203 bp, devtoname(dev), bp->b_flags,
204 (long long)bio->bio_offset,
205 bp->b_bcount, bp->b_data);
211 bioqdisksort(&sc->bio_queue, bio);
221 bio = bioq_first(&sc->bio_queue);
227 bioq_remove(&sc->bio_queue, bio);
230 devstat_start_transaction(&sc->stats);
233 case BUF_CMD_FREEBLKS:
238 panic("md: bad b_cmd %d", bp->b_cmd);
241 nsec = bp->b_bcount >> DEV_BSHIFT;
242 secno = (unsigned)(bio->bio_offset >> DEV_BSHIFT);
245 if (secno < sc->nsecp) {
246 secpp = &sc->secp[secno];
247 if ((u_int)(uintptr_t)*secpp > 255) {
252 secval = (u_int)(uintptr_t)*secpp;
260 kprintf("%08x %p %p %d\n", bp->b_flags, secpp, secp, secval);
263 case BUF_CMD_FREEBLKS:
266 FREE(secp, M_MDSECT);
272 bcopy(secp, dst, DEV_BSIZE);
274 for (i = 0; i < DEV_BSIZE; i++)
277 bzero(dst, DEV_BSIZE);
282 for (i = 1; i < DEV_BSIZE; i++)
285 if (i == DEV_BSIZE && !uc) {
287 FREE(secp, M_MDSECT);
289 *secpp = (u_char *)(uintptr_t)uc;
292 MALLOC(secpp, u_char **, (secno + nsec + 1) * sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
293 bcopy(sc->secp, secpp, sc->nsecp * sizeof(u_char *));
294 FREE(sc->secp, M_MD);
296 sc->nsecp = secno + nsec + 1;
297 secpp = &sc->secp[secno];
299 if (i == DEV_BSIZE) {
301 FREE(secp, M_MDSECT);
302 *secpp = (u_char *)(uintptr_t)uc;
305 MALLOC(secp, u_char *, DEV_BSIZE, M_MDSECT, M_WAITOK);
306 bcopy(dst, secp, DEV_BSIZE);
313 panic("md: bad b_cmd %d", bp->b_cmd);
320 devstat_end_transaction_buf(&sc->stats, bp);
330 mdstrategy_preload(struct dev_strategy_args *ap)
332 cdev_t dev = ap->a_head.a_dev;
333 struct bio *bio = ap->a_bio;
334 struct buf *bp = bio->bio_buf;
338 kprintf("mdstrategy_preload(%p) %s %08x, %lld, %d, %p)\n",
339 bp, devtoname(dev), bp->b_flags,
340 (long long)bio->bio_offset,
341 bp->b_bcount, bp->b_data);
347 bioqdisksort(&sc->bio_queue, bio);
357 bio = bioq_first(&sc->bio_queue);
359 bioq_remove(&sc->bio_queue, bio);
364 devstat_start_transaction(&sc->stats);
367 case BUF_CMD_FREEBLKS:
370 bcopy(sc->pl_ptr + bio->bio_offset,
371 bp->b_data, bp->b_bcount);
374 bcopy(bp->b_data, sc->pl_ptr + bio->bio_offset,
378 panic("md: bad cmd %d\n", bp->b_cmd);
381 devstat_end_transaction_buf(&sc->stats, bp);
390 mdcreate(unsigned length)
393 struct disk_info info;
395 MALLOC(sc, struct md_s *,sizeof(*sc), M_MD, M_WAITOK | M_ZERO);
396 sc->unit = mdunits++;
397 bioq_init(&sc->bio_queue);
398 devstat_add_entry(&sc->stats, "md", sc->unit, DEV_BSIZE,
399 DEVSTAT_NO_ORDERED_TAGS,
400 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
401 DEVSTAT_PRIORITY_OTHER);
402 sc->dev = disk_create(sc->unit, &sc->disk, &md_ops);
403 sc->dev->si_drv1 = sc;
404 sc->dev->si_iosize_max = DFLTPHYS;
405 disk_setdisktype(&sc->disk, "memory");
407 bzero(&info, sizeof(info));
408 info.d_media_blksize = DEV_BSIZE; /* mandatory */
409 info.d_media_blocks = length / DEV_BSIZE;
411 info.d_secpertrack = 1024; /* optional */
413 info.d_secpercyl = info.d_secpertrack * info.d_nheads;
414 info.d_ncylinders = (u_int)(info.d_media_blocks / info.d_secpercyl);
415 disk_setdiskinfo(&sc->disk, &info);
416 TAILQ_INSERT_HEAD(&mdlist, sc, link);
423 mdcreate_preload(u_char *image, unsigned length)
427 sc = mdcreate(length);
428 sc->type = MD_PRELOAD;
429 sc->nsect = length / DEV_BSIZE;
438 mdcreate_malloc(void)
442 sc = mdcreate(MD_NSECT*DEV_BSIZE);
443 sc->type = MD_MALLOC;
445 sc->nsect = MD_NSECT; /* for now */
446 MALLOC(sc->secp, u_char **, sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
448 kprintf("md%d: Malloc disk\n", sc->unit);
456 struct md_s *sc, *sc_temp;
458 if (atomic_fetchadd_int(&refcnt, 0) != 0)
462 * Go through all the md devices, freeing up all the
463 * memory allocated for sectors, and the md_s struct
466 TAILQ_FOREACH_MUTABLE(sc, &mdlist, link, sc_temp) {
467 for (secno = 0; secno < sc->nsecp; secno++) {
468 if ((u_int)(uintptr_t)sc->secp[secno] > 255)
469 FREE(sc->secp[secno], M_MDSECT);
473 disk_destroy(&sc->disk);
475 devstat_remove_entry(&sc->stats);
476 TAILQ_REMOVE(&mdlist, sc, link);
478 FREE(sc->secp, M_MD);
487 md_drvinit(void *unused)
492 u_char *ptr, *name, *type;
496 mdcreate_preload(mfs_root, MD_ROOT_SIZE*1024);
499 while ((mod = preload_search_next_name(mod)) != NULL) {
500 name = (char *)preload_search_info(mod, MODINFO_NAME);
501 type = (char *)preload_search_info(mod, MODINFO_TYPE);
506 if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
508 c = preload_search_info(mod, MODINFO_ADDR);
510 c = preload_search_info(mod, MODINFO_SIZE);
511 len = *(unsigned *)c;
512 kprintf("md%d: Preloaded image <%s> %d bytes at %p\n",
513 mdunits, name, len, ptr);
514 mdcreate_preload(ptr, len);
519 DEV_MODULE(md, mdinit, NULL);
523 md_takeroot(void *junk)
526 rootdevnames[0] = "ufs:/dev/md0s0";
529 SYSINIT(md_root, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, md_takeroot, NULL);