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: head/sys/dev/md/md.c 221855 2011-05-13 19:35:01Z mdf $
10 *
11 */
12
13/*-
14 * The following functions are based in the vn(4) driver: mdstart_swap(),
15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(),
16 * and as such under the following copyright:
17 *
18 * Copyright (c) 1988 University of Utah.
19 * Copyright (c) 1990, 1993
20 * The Regents of the University of California. All rights reserved.
21 *
22 * This code is derived from software contributed to Berkeley by
23 * the Systems Programming Group of the University of Utah Computer
24 * Science Department.
25 *
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions
28 * are met:
29 * 1. Redistributions of source code must retain the above copyright
30 * notice, this list of conditions and the following disclaimer.
31 * 2. Redistributions in binary form must reproduce the above copyright
32 * notice, this list of conditions and the following disclaimer in the
33 * documentation and/or other materials provided with the distribution.
34 * 4. Neither the name of the University nor the names of its contributors
35 * may be used to endorse or promote products derived from this software
36 * without specific prior written permission.
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 *
50 * from: Utah Hdr: vn.c 1.13 94/04/02
51 *
52 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94
53 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03
54 */
55
56#include "opt_geom.h"
57#include "opt_md.h"
58
59#include <sys/param.h>
60#include <sys/systm.h>
61#include <sys/bio.h>
62#include <sys/conf.h>
63#include <sys/devicestat.h>
64#include <sys/fcntl.h>
65#include <sys/kernel.h>
66#include <sys/kthread.h>
67#include <sys/limits.h>
68#include <sys/linker.h>
69#include <sys/lock.h>
70#include <sys/malloc.h>
71#include <sys/mdioctl.h>
72#include <sys/mount.h>
73#include <sys/mutex.h>
74#include <sys/sx.h>
75#include <sys/namei.h>
76#include <sys/proc.h>
77#include <sys/queue.h>
78#include <sys/sched.h>
79#include <sys/sf_buf.h>
80#include <sys/sysctl.h>
81#include <sys/vnode.h>
82
83#include <geom/geom.h>
84
85#include <vm/vm.h>
86#include <vm/vm_object.h>
87#include <vm/vm_page.h>
88#include <vm/vm_pager.h>
89#include <vm/swap_pager.h>
90#include <vm/uma.h>
91
92#include <machine/vmparam.h>
93
94#define MD_MODVER 1
95
96#define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */
97#define MD_EXITING 0x20000 /* Worker thread is exiting. */
98
99#ifndef MD_NSECT
100#define MD_NSECT (10000 * 2)
101#endif
102
103static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk");
104static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors");
105
106static int md_debug;
107SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, "");
108static int md_malloc_wait;
109SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, "");
110
111#if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
112/*
113 * Preloaded image gets put here.
114 * Applications that patch the object with the image can determine
115 * the size looking at the start and end markers (strings),
116 * so we want them contiguous.
117 */
118static struct {
119 u_char start[MD_ROOT_SIZE*1024];
120 u_char end[128];
121} mfs_root = {
122 .start = "MFS Filesystem goes here",
123 .end = "MFS Filesystem had better STOP here",
124};
125#endif
126
127static g_init_t g_md_init;
128static g_fini_t g_md_fini;
129static g_start_t g_md_start;
130static g_access_t g_md_access;
131static void g_md_dumpconf(struct sbuf *sb, const char *indent,
132 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp);
133
134static int mdunits;
135static struct cdev *status_dev = 0;
136static struct sx md_sx;
137static struct unrhdr *md_uh;
138
139static d_ioctl_t mdctlioctl;
140
141static struct cdevsw mdctl_cdevsw = {
142 .d_version = D_VERSION,
143 .d_ioctl = mdctlioctl,
144 .d_name = MD_NAME,
145};
146
147struct g_class g_md_class = {
148 .name = "MD",
149 .version = G_VERSION,
150 .init = g_md_init,
151 .fini = g_md_fini,
152 .start = g_md_start,
153 .access = g_md_access,
154 .dumpconf = g_md_dumpconf,
155};
156
157DECLARE_GEOM_CLASS(g_md_class, g_md);
158
159
160static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list);
161
162#define NINDIR (PAGE_SIZE / sizeof(uintptr_t))
163#define NMASK (NINDIR-1)
164static int nshift;
165
166struct indir {
167 uintptr_t *array;
168 u_int total;
169 u_int used;
170 u_int shift;
171};
172
173struct md_s {
174 int unit;
175 LIST_ENTRY(md_s) list;
176 struct bio_queue_head bio_queue;
177 struct mtx queue_mtx;
178 struct cdev *dev;
179 enum md_types type;
180 off_t mediasize;
181 unsigned sectorsize;
182 unsigned opencount;
183 unsigned fwheads;
184 unsigned fwsectors;
185 unsigned flags;
186 char name[20];
187 struct proc *procp;
188 struct g_geom *gp;
189 struct g_provider *pp;
190 int (*start)(struct md_s *sc, struct bio *bp);
191 struct devstat *devstat;
192
193 /* MD_MALLOC related fields */
194 struct indir *indir;
195 uma_zone_t uma;
196
197 /* MD_PRELOAD related fields */
198 u_char *pl_ptr;
199 size_t pl_len;
200
201 /* MD_VNODE related fields */
202 struct vnode *vnode;
203 char file[PATH_MAX];
204 struct ucred *cred;
205
206 /* MD_SWAP related fields */
207 vm_object_t object;
208};
209
210static struct indir *
211new_indir(u_int shift)
212{
213 struct indir *ip;
214
215 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT)
216 | M_ZERO);
217 if (ip == NULL)
218 return (NULL);
219 ip->array = malloc(sizeof(uintptr_t) * NINDIR,
220 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO);
221 if (ip->array == NULL) {
222 free(ip, M_MD);
223 return (NULL);
224 }
225 ip->total = NINDIR;
226 ip->shift = shift;
227 return (ip);
228}
229
230static void
231del_indir(struct indir *ip)
232{
233
234 free(ip->array, M_MDSECT);
235 free(ip, M_MD);
236}
237
238static void
239destroy_indir(struct md_s *sc, struct indir *ip)
240{
241 int i;
242
243 for (i = 0; i < NINDIR; i++) {
244 if (!ip->array[i])
245 continue;
246 if (ip->shift)
247 destroy_indir(sc, (struct indir*)(ip->array[i]));
248 else if (ip->array[i] > 255)
249 uma_zfree(sc->uma, (void *)(ip->array[i]));
250 }
251 del_indir(ip);
252}
253
254/*
255 * This function does the math and allocates the top level "indir" structure
256 * for a device of "size" sectors.
257 */
258
259static struct indir *
260dimension(off_t size)
261{
262 off_t rcnt;
263 struct indir *ip;
264 int layer;
265
266 rcnt = size;
267 layer = 0;
268 while (rcnt > NINDIR) {
269 rcnt /= NINDIR;
270 layer++;
271 }
272
273 /*
274 * XXX: the top layer is probably not fully populated, so we allocate
275 * too much space for ip->array in here.
276 */
277 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO);
278 ip->array = malloc(sizeof(uintptr_t) * NINDIR,
279 M_MDSECT, M_WAITOK | M_ZERO);
280 ip->total = NINDIR;
281 ip->shift = layer * nshift;
282 return (ip);
283}
284
285/*
286 * Read a given sector
287 */
288
289static uintptr_t
290s_read(struct indir *ip, off_t offset)
291{
292 struct indir *cip;
293 int idx;
294 uintptr_t up;
295
296 if (md_debug > 1)
297 printf("s_read(%jd)\n", (intmax_t)offset);
298 up = 0;
299 for (cip = ip; cip != NULL;) {
300 if (cip->shift) {
301 idx = (offset >> cip->shift) & NMASK;
302 up = cip->array[idx];
303 cip = (struct indir *)up;
304 continue;
305 }
306 idx = offset & NMASK;
307 return (cip->array[idx]);
308 }
309 return (0);
310}
311
312/*
313 * Write a given sector, prune the tree if the value is 0
314 */
315
316static int
317s_write(struct indir *ip, off_t offset, uintptr_t ptr)
318{
319 struct indir *cip, *lip[10];
320 int idx, li;
321 uintptr_t up;
322
323 if (md_debug > 1)
324 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr);
325 up = 0;
326 li = 0;
327 cip = ip;
328 for (;;) {
329 lip[li++] = cip;
330 if (cip->shift) {
331 idx = (offset >> cip->shift) & NMASK;
332 up = cip->array[idx];
333 if (up != 0) {
334 cip = (struct indir *)up;
335 continue;
336 }
337 /* Allocate branch */
338 cip->array[idx] =
339 (uintptr_t)new_indir(cip->shift - nshift);
340 if (cip->array[idx] == 0)
341 return (ENOSPC);
342 cip->used++;
343 up = cip->array[idx];
344 cip = (struct indir *)up;
345 continue;
346 }
347 /* leafnode */
348 idx = offset & NMASK;
349 up = cip->array[idx];
350 if (up != 0)
351 cip->used--;
352 cip->array[idx] = ptr;
353 if (ptr != 0)
354 cip->used++;
355 break;
356 }
357 if (cip->used != 0 || li == 1)
358 return (0);
359 li--;
360 while (cip->used == 0 && cip != ip) {
361 li--;
362 idx = (offset >> lip[li]->shift) & NMASK;
363 up = lip[li]->array[idx];
364 KASSERT(up == (uintptr_t)cip, ("md screwed up"));
365 del_indir(cip);
366 lip[li]->array[idx] = 0;
367 lip[li]->used--;
368 cip = lip[li];
369 }
370 return (0);
371}
372
373
374static int
375g_md_access(struct g_provider *pp, int r, int w, int e)
376{
377 struct md_s *sc;
378
379 sc = pp->geom->softc;
380 if (sc == NULL) {
381 if (r <= 0 && w <= 0 && e <= 0)
382 return (0);
383 return (ENXIO);
384 }
385 r += pp->acr;
386 w += pp->acw;
387 e += pp->ace;
388 if ((sc->flags & MD_READONLY) != 0 && w > 0)
389 return (EROFS);
390 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
391 sc->opencount = 1;
392 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
393 sc->opencount = 0;
394 }
395 return (0);
396}
397
398static void
399g_md_start(struct bio *bp)
400{
401 struct md_s *sc;
402
403 sc = bp->bio_to->geom->softc;
404 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE))
405 devstat_start_transaction_bio(sc->devstat, bp);
406 mtx_lock(&sc->queue_mtx);
407 bioq_disksort(&sc->bio_queue, bp);
408 mtx_unlock(&sc->queue_mtx);
409 wakeup(sc);
410}
411
412static int
413mdstart_malloc(struct md_s *sc, struct bio *bp)
414{
415 int i, error;
416 u_char *dst;
417 off_t secno, nsec, uc;
418 uintptr_t sp, osp;
419
420 switch (bp->bio_cmd) {
421 case BIO_READ:
422 case BIO_WRITE:
423 case BIO_DELETE:
424 break;
425 default:
426 return (EOPNOTSUPP);
427 }
428
429 nsec = bp->bio_length / sc->sectorsize;
430 secno = bp->bio_offset / sc->sectorsize;
431 dst = bp->bio_data;
432 error = 0;
433 while (nsec--) {
434 osp = s_read(sc->indir, secno);
435 if (bp->bio_cmd == BIO_DELETE) {
436 if (osp != 0)
437 error = s_write(sc->indir, secno, 0);
438 } else if (bp->bio_cmd == BIO_READ) {
439 if (osp == 0)
440 bzero(dst, sc->sectorsize);
441 else if (osp <= 255)
442 memset(dst, osp, sc->sectorsize);
443 else {
444 bcopy((void *)osp, dst, sc->sectorsize);
445 cpu_flush_dcache(dst, sc->sectorsize);
446 }
447 osp = 0;
448 } else if (bp->bio_cmd == BIO_WRITE) {
449 if (sc->flags & MD_COMPRESS) {
450 uc = dst[0];
451 for (i = 1; i < sc->sectorsize; i++)
452 if (dst[i] != uc)
453 break;
454 } else {
455 i = 0;
456 uc = 0;
457 }
458 if (i == sc->sectorsize) {
459 if (osp != uc)
460 error = s_write(sc->indir, secno, uc);
461 } else {
462 if (osp <= 255) {
463 sp = (uintptr_t)uma_zalloc(sc->uma,
464 md_malloc_wait ? M_WAITOK :
465 M_NOWAIT);
466 if (sp == 0) {
467 error = ENOSPC;
468 break;
469 }
470 bcopy(dst, (void *)sp, sc->sectorsize);
471 error = s_write(sc->indir, secno, sp);
472 } else {
473 bcopy(dst, (void *)osp, sc->sectorsize);
474 osp = 0;
475 }
476 }
477 } else {
478 error = EOPNOTSUPP;
479 }
480 if (osp > 255)
481 uma_zfree(sc->uma, (void*)osp);
482 if (error != 0)
483 break;
484 secno++;
485 dst += sc->sectorsize;
486 }
487 bp->bio_resid = 0;
488 return (error);
489}
490
491static int
492mdstart_preload(struct md_s *sc, struct bio *bp)
493{
494
495 switch (bp->bio_cmd) {
496 case BIO_READ:
497 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data,
498 bp->bio_length);
499 cpu_flush_dcache(bp->bio_data, bp->bio_length);
500 break;
501 case BIO_WRITE:
502 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset,
503 bp->bio_length);
504 break;
505 }
506 bp->bio_resid = 0;
507 return (0);
508}
509
510static int
511mdstart_vnode(struct md_s *sc, struct bio *bp)
512{
513 int error, vfslocked;
514 struct uio auio;
515 struct iovec aiov;
516 struct mount *mp;
517 struct vnode *vp;
518 struct thread *td;
519 off_t end, zerosize;
520
521 switch (bp->bio_cmd) {
522 case BIO_READ:
523 case BIO_WRITE:
524 case BIO_DELETE:
525 case BIO_FLUSH:
526 break;
527 default:
528 return (EOPNOTSUPP);
529 }
530
531 td = curthread;
532 vp = sc->vnode;
533
534 /*
535 * VNODE I/O
536 *
537 * If an error occurs, we set BIO_ERROR but we do not set
538 * B_INVAL because (for a write anyway), the buffer is
539 * still valid.
540 */
541
542 if (bp->bio_cmd == BIO_FLUSH) {
543 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
544 (void) vn_start_write(vp, &mp, V_WAIT);
545 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
546 error = VOP_FSYNC(vp, MNT_WAIT, td);
547 VOP_UNLOCK(vp, 0);
548 vn_finished_write(mp);
549 VFS_UNLOCK_GIANT(vfslocked);
550 return (error);
551 }
552
553 bzero(&auio, sizeof(auio));
554
555 /*
556 * Special case for BIO_DELETE. On the surface, this is very
557 * similar to BIO_WRITE, except that we write from our own
558 * fixed-length buffer, so we have to loop. The net result is
559 * that the two cases end up having very little in common.
560 */
561 if (bp->bio_cmd == BIO_DELETE) {
562 zerosize = ZERO_REGION_SIZE -
563 (ZERO_REGION_SIZE % sc->sectorsize);
564 auio.uio_iov = &aiov;
565 auio.uio_iovcnt = 1;
566 auio.uio_offset = (vm_ooffset_t)bp->bio_offset;
567 auio.uio_segflg = UIO_SYSSPACE;
568 auio.uio_rw = UIO_WRITE;
569 auio.uio_td = td;
570 end = bp->bio_offset + bp->bio_length;
571 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
572 (void) vn_start_write(vp, &mp, V_WAIT);
573 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
574 error = 0;
575 while (auio.uio_offset < end) {
576 aiov.iov_base = __DECONST(void *, zero_region);
577 aiov.iov_len = end - auio.uio_offset;
578 if (aiov.iov_len > zerosize)
579 aiov.iov_len = zerosize;
580 auio.uio_resid = aiov.iov_len;
581 error = VOP_WRITE(vp, &auio,
582 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred);
583 if (error != 0)
584 break;
585 }
586 VOP_UNLOCK(vp, 0);
587 vn_finished_write(mp);
588 bp->bio_resid = end - auio.uio_offset;
589 VFS_UNLOCK_GIANT(vfslocked);
590 return (error);
591 }
592
593 aiov.iov_base = bp->bio_data;
594 aiov.iov_len = bp->bio_length;
595 auio.uio_iov = &aiov;
596 auio.uio_iovcnt = 1;
597 auio.uio_offset = (vm_ooffset_t)bp->bio_offset;
598 auio.uio_segflg = UIO_SYSSPACE;
599 if (bp->bio_cmd == BIO_READ)
600 auio.uio_rw = UIO_READ;
601 else if (bp->bio_cmd == BIO_WRITE)
602 auio.uio_rw = UIO_WRITE;
603 else
604 panic("wrong BIO_OP in mdstart_vnode");
605 auio.uio_resid = bp->bio_length;
606 auio.uio_td = td;
607 /*
608 * When reading set IO_DIRECT to try to avoid double-caching
609 * the data. When writing IO_DIRECT is not optimal.
610 */
611 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
612 if (bp->bio_cmd == BIO_READ) {
613 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
614 error = VOP_READ(vp, &auio, IO_DIRECT, sc->cred);
615 VOP_UNLOCK(vp, 0);
616 } else {
617 (void) vn_start_write(vp, &mp, V_WAIT);
618 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
619 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC,
620 sc->cred);
621 VOP_UNLOCK(vp, 0);
622 vn_finished_write(mp);
623 }
624 VFS_UNLOCK_GIANT(vfslocked);
625 bp->bio_resid = auio.uio_resid;
626 return (error);
627}
628
629static int
630mdstart_swap(struct md_s *sc, struct bio *bp)
631{
632 struct sf_buf *sf;
633 int rv, offs, len, lastend;
634 vm_pindex_t i, lastp;
635 vm_page_t m;
636 u_char *p;
637
638 switch (bp->bio_cmd) {
639 case BIO_READ:
640 case BIO_WRITE:
641 case BIO_DELETE:
642 break;
643 default:
644 return (EOPNOTSUPP);
645 }
646
647 p = bp->bio_data;
648
649 /*
650 * offs is the offset at which to start operating on the
651 * next (ie, first) page. lastp is the last page on
652 * which we're going to operate. lastend is the ending
653 * position within that last page (ie, PAGE_SIZE if
654 * we're operating on complete aligned pages).
655 */
656 offs = bp->bio_offset % PAGE_SIZE;
657 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE;
658 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1;
659
660 rv = VM_PAGER_OK;
661 VM_OBJECT_LOCK(sc->object);
662 vm_object_pip_add(sc->object, 1);
663 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) {
664 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs;
665
666 m = vm_page_grab(sc->object, i,
667 VM_ALLOC_NORMAL|VM_ALLOC_RETRY);
668 VM_OBJECT_UNLOCK(sc->object);
669 sched_pin();
670 sf = sf_buf_alloc(m, SFB_CPUPRIVATE);
671 VM_OBJECT_LOCK(sc->object);
672 if (bp->bio_cmd == BIO_READ) {
673 if (m->valid != VM_PAGE_BITS_ALL)
674 rv = vm_pager_get_pages(sc->object, &m, 1, 0);
675 if (rv == VM_PAGER_ERROR) {
676 sf_buf_free(sf);
677 sched_unpin();
678 vm_page_wakeup(m);
679 break;
680 }
681 bcopy((void *)(sf_buf_kva(sf) + offs), p, len);
682 cpu_flush_dcache(p, len);
683 } else if (bp->bio_cmd == BIO_WRITE) {
684 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL)
685 rv = vm_pager_get_pages(sc->object, &m, 1, 0);
686 if (rv == VM_PAGER_ERROR) {
687 sf_buf_free(sf);
688 sched_unpin();
689 vm_page_wakeup(m);
690 break;
691 }
692 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len);
693 m->valid = VM_PAGE_BITS_ALL;
694 } else if (bp->bio_cmd == BIO_DELETE) {
695 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL)
696 rv = vm_pager_get_pages(sc->object, &m, 1, 0);
697 if (rv == VM_PAGER_ERROR) {
698 sf_buf_free(sf);
699 sched_unpin();
700 vm_page_wakeup(m);
701 break;
702 }
703 if (len != PAGE_SIZE) {
704 bzero((void *)(sf_buf_kva(sf) + offs), len);
705 vm_page_clear_dirty(m, offs, len);
706 m->valid = VM_PAGE_BITS_ALL;
707 } else
708 vm_pager_page_unswapped(m);
709 }
710 sf_buf_free(sf);
711 sched_unpin();
712 vm_page_wakeup(m);
713 vm_page_lock(m);
714 if (bp->bio_cmd == BIO_DELETE && len == PAGE_SIZE)
715 vm_page_free(m);
716 else
717 vm_page_activate(m);
718 vm_page_unlock(m);
719 if (bp->bio_cmd == BIO_WRITE)
720 vm_page_dirty(m);
721
722 /* Actions on further pages start at offset 0 */
723 p += PAGE_SIZE - offs;
724 offs = 0;
725#if 0
726if (bootverbose || bp->bio_offset / PAGE_SIZE < 17)
727printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n",
728 m->wire_count, m->busy,
729 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i);
730#endif
731 }
732 vm_object_pip_subtract(sc->object, 1);
733 VM_OBJECT_UNLOCK(sc->object);
734 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC);
735}
736
737static void
738md_kthread(void *arg)
739{
740 struct md_s *sc;
741 struct bio *bp;
742 int error;
743
744 sc = arg;
745 thread_lock(curthread);
746 sched_prio(curthread, PRIBIO);
747 thread_unlock(curthread);
748 if (sc->type == MD_VNODE)
749 curthread->td_pflags |= TDP_NORUNNINGBUF;
750
751 for (;;) {
752 mtx_lock(&sc->queue_mtx);
753 if (sc->flags & MD_SHUTDOWN) {
754 sc->flags |= MD_EXITING;
755 mtx_unlock(&sc->queue_mtx);
756 kproc_exit(0);
757 }
758 bp = bioq_takefirst(&sc->bio_queue);
759 if (!bp) {
760 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0);
761 continue;
762 }
763 mtx_unlock(&sc->queue_mtx);
764 if (bp->bio_cmd == BIO_GETATTR) {
765 if ((sc->fwsectors && sc->fwheads &&
766 (g_handleattr_int(bp, "GEOM::fwsectors",
767 sc->fwsectors) ||
768 g_handleattr_int(bp, "GEOM::fwheads",
769 sc->fwheads))) ||
770 g_handleattr_int(bp, "GEOM::candelete", 1))
771 error = -1;
772 else
773 error = EOPNOTSUPP;
774 } else {
775 error = sc->start(sc, bp);
776 }
777
778 if (error != -1) {
779 bp->bio_completed = bp->bio_length;
780 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE))
781 devstat_end_transaction_bio(sc->devstat, bp);
782 g_io_deliver(bp, error);
783 }
784 }
785}
786
787static struct md_s *
788mdfind(int unit)
789{
790 struct md_s *sc;
791
792 LIST_FOREACH(sc, &md_softc_list, list) {
793 if (sc->unit == unit)
794 break;
795 }
796 return (sc);
797}
798
799static struct md_s *
800mdnew(int unit, int *errp, enum md_types type)
801{
802 struct md_s *sc;
803 int error;
804
805 *errp = 0;
806 if (unit == -1)
807 unit = alloc_unr(md_uh);
808 else
809 unit = alloc_unr_specific(md_uh, unit);
810
811 if (unit == -1) {
812 *errp = EBUSY;
813 return (NULL);
814 }
815
816 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO);
817 sc->type = type;
818 bioq_init(&sc->bio_queue);
819 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF);
820 sc->unit = unit;
821 sprintf(sc->name, "md%d", unit);
822 LIST_INSERT_HEAD(&md_softc_list, sc, list);
823 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name);
824 if (error == 0)
825 return (sc);
826 LIST_REMOVE(sc, list);
827 mtx_destroy(&sc->queue_mtx);
828 free_unr(md_uh, sc->unit);
829 free(sc, M_MD);
830 *errp = error;
831 return (NULL);
832}
833
834static void
835mdinit(struct md_s *sc)
836{
837 struct g_geom *gp;
838 struct g_provider *pp;
839
840 g_topology_lock();
841 gp = g_new_geomf(&g_md_class, "md%d", sc->unit);
842 gp->softc = sc;
843 pp = g_new_providerf(gp, "md%d", sc->unit);
844 pp->mediasize = sc->mediasize;
845 pp->sectorsize = sc->sectorsize;
846 sc->gp = gp;
847 sc->pp = pp;
848 g_error_provider(pp, 0);
849 g_topology_unlock();
850 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize,
851 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
852}
853
854/*
855 * XXX: we should check that the range they feed us is mapped.
856 * XXX: we should implement read-only.
857 */
858
859static int
860mdcreate_preload(struct md_s *sc, struct md_ioctl *mdio)
861{
862
863 if (mdio->md_options & ~(MD_AUTOUNIT | MD_FORCE))
864 return (EINVAL);
865 if (mdio->md_base == 0)
866 return (EINVAL);
867 sc->flags = mdio->md_options & MD_FORCE;
868 /* Cast to pointer size, then to pointer to avoid warning */
869 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base;
870 sc->pl_len = (size_t)sc->mediasize;
871 return (0);
872}
873
874
875static int
876mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio)
877{
878 uintptr_t sp;
879 int error;
880 off_t u;
881
882 error = 0;
883 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE))
884 return (EINVAL);
885 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize))
886 return (EINVAL);
887 /* Compression doesn't make sense if we have reserved space */
888 if (mdio->md_options & MD_RESERVE)
889 mdio->md_options &= ~MD_COMPRESS;
890 if (mdio->md_fwsectors != 0)
891 sc->fwsectors = mdio->md_fwsectors;
892 if (mdio->md_fwheads != 0)
893 sc->fwheads = mdio->md_fwheads;
894 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE);
895 sc->indir = dimension(sc->mediasize / sc->sectorsize);
896 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL,
897 0x1ff, 0);
898 if (mdio->md_options & MD_RESERVE) {
899 off_t nsectors;
900
901 nsectors = sc->mediasize / sc->sectorsize;
902 for (u = 0; u < nsectors; u++) {
903 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ?
904 M_WAITOK : M_NOWAIT) | M_ZERO);
905 if (sp != 0)
906 error = s_write(sc->indir, u, sp);
907 else
908 error = ENOMEM;
909 if (error != 0)
910 break;
911 }
912 }
913 return (error);
914}
915
916
917static int
918mdsetcred(struct md_s *sc, struct ucred *cred)
919{
920 char *tmpbuf;
921 int error = 0;
922
923 /*
924 * Set credits in our softc
925 */
926
927 if (sc->cred)
928 crfree(sc->cred);
929 sc->cred = crhold(cred);
930
931 /*
932 * Horrible kludge to establish credentials for NFS XXX.
933 */
934
935 if (sc->vnode) {
936 struct uio auio;
937 struct iovec aiov;
938
939 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK);
940 bzero(&auio, sizeof(auio));
941
942 aiov.iov_base = tmpbuf;
943 aiov.iov_len = sc->sectorsize;
944 auio.uio_iov = &aiov;
945 auio.uio_iovcnt = 1;
946 auio.uio_offset = 0;
947 auio.uio_rw = UIO_READ;
948 auio.uio_segflg = UIO_SYSSPACE;
949 auio.uio_resid = aiov.iov_len;
950 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY);
951 error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
952 VOP_UNLOCK(sc->vnode, 0);
953 free(tmpbuf, M_TEMP);
954 }
955 return (error);
956}
957
958static int
959mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td)
960{
961 struct vattr vattr;
962 struct nameidata nd;
963 char *fname;
964 int error, flags, vfslocked;
965
966 /*
967 * Kernel-originated requests must have the filename appended
968 * to the mdio structure to protect against malicious software.
969 */
970 fname = mdio->md_file;
971 if ((void *)fname != (void *)(mdio + 1)) {
972 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL);
973 if (error != 0)
974 return (error);
975 } else
976 strlcpy(sc->file, fname, sizeof(sc->file));
977
978 /*
979 * If the user specified that this is a read only device, don't
980 * set the FWRITE mask before trying to open the backing store.
981 */
982 flags = FREAD | ((mdio->md_options & MD_READONLY) ? 0 : FWRITE);
983 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, sc->file, td);
984 error = vn_open(&nd, &flags, 0, NULL);
985 if (error != 0)
986 return (error);
987 vfslocked = NDHASGIANT(&nd);
988 NDFREE(&nd, NDF_ONLY_PNBUF);
989 if (nd.ni_vp->v_type != VREG) {
990 error = EINVAL;
991 goto bad;
992 }
993 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred);
994 if (error != 0)
995 goto bad;
996 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) {
997 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY);
998 if (nd.ni_vp->v_iflag & VI_DOOMED) {
999 /* Forced unmount. */
1000 error = EBADF;
1001 goto bad;
1002 }
1003 }
1004 nd.ni_vp->v_vflag |= VV_MD;
1005 VOP_UNLOCK(nd.ni_vp, 0);
1006
1007 if (mdio->md_fwsectors != 0)
1008 sc->fwsectors = mdio->md_fwsectors;
1009 if (mdio->md_fwheads != 0)
1010 sc->fwheads = mdio->md_fwheads;
1011 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC);
1012 if (!(flags & FWRITE))
1013 sc->flags |= MD_READONLY;
1014 sc->vnode = nd.ni_vp;
1015
1016 error = mdsetcred(sc, td->td_ucred);
1017 if (error != 0) {
1018 sc->vnode = NULL;
1019 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
1020 nd.ni_vp->v_vflag &= ~VV_MD;
1021 goto bad;
1022 }
1023 VFS_UNLOCK_GIANT(vfslocked);
1024 return (0);
1025bad:
1026 VOP_UNLOCK(nd.ni_vp, 0);
1027 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td);
1028 VFS_UNLOCK_GIANT(vfslocked);
1029 return (error);
1030}
1031
1032static int
1033mddestroy(struct md_s *sc, struct thread *td)
1034{
1035 int vfslocked;
1036
1037 if (sc->gp) {
1038 sc->gp->softc = NULL;
1039 g_topology_lock();
1040 g_wither_geom(sc->gp, ENXIO);
1041 g_topology_unlock();
1042 sc->gp = NULL;
1043 sc->pp = NULL;
1044 }
1045 if (sc->devstat) {
1046 devstat_remove_entry(sc->devstat);
1047 sc->devstat = NULL;
1048 }
1049 mtx_lock(&sc->queue_mtx);
1050 sc->flags |= MD_SHUTDOWN;
1051 wakeup(sc);
1052 while (!(sc->flags & MD_EXITING))
1053 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10);
1054 mtx_unlock(&sc->queue_mtx);
1055 mtx_destroy(&sc->queue_mtx);
1056 if (sc->vnode != NULL) {
1057 vfslocked = VFS_LOCK_GIANT(sc->vnode->v_mount);
1058 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY);
1059 sc->vnode->v_vflag &= ~VV_MD;
1060 VOP_UNLOCK(sc->vnode, 0);
1061 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ?
1062 FREAD : (FREAD|FWRITE), sc->cred, td);
1063 VFS_UNLOCK_GIANT(vfslocked);
1064 }
1065 if (sc->cred != NULL)
1066 crfree(sc->cred);
1067 if (sc->object != NULL)
1068 vm_object_deallocate(sc->object);
1069 if (sc->indir)
1070 destroy_indir(sc, sc->indir);
1071 if (sc->uma)
1072 uma_zdestroy(sc->uma);
1073
1074 LIST_REMOVE(sc, list);
1075 free_unr(md_uh, sc->unit);
1076 free(sc, M_MD);
1077 return (0);
1078}
1079
1080static int
1081mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td)
1082{
1083 vm_ooffset_t npage;
1084 int error;
1085
1086 /*
1087 * Range check. Disallow negative sizes or any size less then the
1088 * size of a page. Then round to a page.
1089 */
1090 if (sc->mediasize == 0 || (sc->mediasize % PAGE_SIZE) != 0)
1091 return (EDOM);
1092
1093 /*
1094 * Allocate an OBJT_SWAP object.
1095 *
1096 * Note the truncation.
1097 */
1098
1099 npage = mdio->md_mediasize / PAGE_SIZE;
1100 if (mdio->md_fwsectors != 0)
1101 sc->fwsectors = mdio->md_fwsectors;
1102 if (mdio->md_fwheads != 0)
1103 sc->fwheads = mdio->md_fwheads;
1104 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage,
1105 VM_PROT_DEFAULT, 0, td->td_ucred);
1106 if (sc->object == NULL)
1107 return (ENOMEM);
1108 sc->flags = mdio->md_options & MD_FORCE;
1109 if (mdio->md_options & MD_RESERVE) {
1110 if (swap_pager_reserve(sc->object, 0, npage) < 0) {
1111 error = EDOM;
1112 goto finish;
1113 }
1114 }
1115 error = mdsetcred(sc, td->td_ucred);
1116 finish:
1117 if (error != 0) {
1118 vm_object_deallocate(sc->object);
1119 sc->object = NULL;
1120 }
1121 return (error);
1122}
1123
1124
1125static int
1126xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
1127{
1128 struct md_ioctl *mdio;
1129 struct md_s *sc;
1130 int error, i;
1131
1132 if (md_debug)
1133 printf("mdctlioctl(%s %lx %p %x %p)\n",
1134 devtoname(dev), cmd, addr, flags, td);
1135
1136 mdio = (struct md_ioctl *)addr;
1137 if (mdio->md_version != MDIOVERSION)
1138 return (EINVAL);
1139
1140 /*
1141 * We assert the version number in the individual ioctl
1142 * handlers instead of out here because (a) it is possible we
1143 * may add another ioctl in the future which doesn't read an
1144 * mdio, and (b) the correct return value for an unknown ioctl
1145 * is ENOIOCTL, not EINVAL.
1146 */
1147 error = 0;
1148 switch (cmd) {
1149 case MDIOCATTACH:
1150 switch (mdio->md_type) {
1151 case MD_MALLOC:
1152 case MD_PRELOAD:
1153 case MD_VNODE:
1154 case MD_SWAP:
1155 break;
1156 default:
1157 return (EINVAL);
1158 }
1159 if (mdio->md_options & MD_AUTOUNIT)
1160 sc = mdnew(-1, &error, mdio->md_type);
1161 else {
1162 if (mdio->md_unit > INT_MAX)
1163 return (EINVAL);
1164 sc = mdnew(mdio->md_unit, &error, mdio->md_type);
1165 }
1166 if (sc == NULL)
1167 return (error);
1168 if (mdio->md_options & MD_AUTOUNIT)
1169 mdio->md_unit = sc->unit;
1170 sc->mediasize = mdio->md_mediasize;
1171 if (mdio->md_sectorsize == 0)
1172 sc->sectorsize = DEV_BSIZE;
1173 else
1174 sc->sectorsize = mdio->md_sectorsize;
1175 error = EDOOFUS;
1176 switch (sc->type) {
1177 case MD_MALLOC:
1178 sc->start = mdstart_malloc;
1179 error = mdcreate_malloc(sc, mdio);
1180 break;
1181 case MD_PRELOAD:
1182 sc->start = mdstart_preload;
1183 error = mdcreate_preload(sc, mdio);
1184 break;
1185 case MD_VNODE:
1186 sc->start = mdstart_vnode;
1187 error = mdcreate_vnode(sc, mdio, td);
1188 break;
1189 case MD_SWAP:
1190 sc->start = mdstart_swap;
1191 error = mdcreate_swap(sc, mdio, td);
1192 break;
1193 }
1194 if (error != 0) {
1195 mddestroy(sc, td);
1196 return (error);
1197 }
1198
1199 /* Prune off any residual fractional sector */
1200 i = sc->mediasize % sc->sectorsize;
1201 sc->mediasize -= i;
1202
1203 mdinit(sc);
1204 return (0);
1205 case MDIOCDETACH:
1206 if (mdio->md_mediasize != 0 ||
1207 (mdio->md_options & ~MD_FORCE) != 0)
1208 return (EINVAL);
1209
1210 sc = mdfind(mdio->md_unit);
1211 if (sc == NULL)
1212 return (ENOENT);
1213 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) &&
1214 !(mdio->md_options & MD_FORCE))
1215 return (EBUSY);
1216 return (mddestroy(sc, td));
1217 case MDIOCQUERY:
1218 sc = mdfind(mdio->md_unit);
1219 if (sc == NULL)
1220 return (ENOENT);
1221 mdio->md_type = sc->type;
1222 mdio->md_options = sc->flags;
1223 mdio->md_mediasize = sc->mediasize;
1224 mdio->md_sectorsize = sc->sectorsize;
1225 if (sc->type == MD_VNODE)
1226 error = copyout(sc->file, mdio->md_file,
1227 strlen(sc->file) + 1);
1228 return (error);
1229 case MDIOCLIST:
1230 i = 1;
1231 LIST_FOREACH(sc, &md_softc_list, list) {
1232 if (i == MDNPAD - 1)
1233 mdio->md_pad[i] = -1;
1234 else
1235 mdio->md_pad[i++] = sc->unit;
1236 }
1237 mdio->md_pad[0] = i - 1;
1238 return (0);
1239 default:
1240 return (ENOIOCTL);
1241 };
1242}
1243
1244static int
1245mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
1246{
1247 int error;
1248
1249 sx_xlock(&md_sx);
1250 error = xmdctlioctl(dev, cmd, addr, flags, td);
1251 sx_xunlock(&md_sx);
1252 return (error);
1253}
1254
1255static void
1256md_preloaded(u_char *image, size_t length)
1257{
1258 struct md_s *sc;
1259 int error;
1260
1261 sc = mdnew(-1, &error, MD_PRELOAD);
1262 if (sc == NULL)
1263 return;
1264 sc->mediasize = length;
1265 sc->sectorsize = DEV_BSIZE;
1266 sc->pl_ptr = image;
1267 sc->pl_len = length;
1268 sc->start = mdstart_preload;
1269#ifdef MD_ROOT
1270 if (sc->unit == 0)
1271 rootdevnames[0] = "ufs:/dev/md0";
1272#endif
1273 mdinit(sc);
1274}
1275
1276static void
1277g_md_init(struct g_class *mp __unused)
1278{
1279 caddr_t mod;
1280 u_char *ptr, *name, *type;
1281 unsigned len;
1282 int i;
1283
1284 /* figure out log2(NINDIR) */
1285 for (i = NINDIR, nshift = -1; i; nshift++)
1286 i >>= 1;
1287
1288 mod = NULL;
1289 sx_init(&md_sx, "MD config lock");
1290 g_topology_unlock();
1291 md_uh = new_unrhdr(0, INT_MAX, NULL);
1292#ifdef MD_ROOT_SIZE
1293 sx_xlock(&md_sx);
1294 md_preloaded(mfs_root.start, sizeof(mfs_root.start));
1295 sx_xunlock(&md_sx);
1296#endif
1297 /* XXX: are preload_* static or do they need Giant ? */
1298 while ((mod = preload_search_next_name(mod)) != NULL) {
1299 name = (char *)preload_search_info(mod, MODINFO_NAME);
1300 if (name == NULL)
1301 continue;
1302 type = (char *)preload_search_info(mod, MODINFO_TYPE);
1303 if (type == NULL)
1304 continue;
1305 if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
1306 continue;
1307 ptr = preload_fetch_addr(mod);
1308 len = preload_fetch_size(mod);
1309 if (ptr != NULL && len != 0) {
1310 printf("%s%d: Preloaded image <%s> %d bytes at %p\n",
1311 MD_NAME, mdunits, name, len, ptr);
1312 sx_xlock(&md_sx);
1313 md_preloaded(ptr, len);
1314 sx_xunlock(&md_sx);
1315 }
1316 }
1317 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL,
1318 0600, MDCTL_NAME);
1319 g_topology_lock();
1320}
1321
1322static void
1323g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
1324 struct g_consumer *cp __unused, struct g_provider *pp)
1325{
1326 struct md_s *mp;
1327 char *type;
1328
1329 mp = gp->softc;
1330 if (mp == NULL)
1331 return;
1332
1333 switch (mp->type) {
1334 case MD_MALLOC:
1335 type = "malloc";
1336 break;
1337 case MD_PRELOAD:
1338 type = "preload";
1339 break;
1340 case MD_VNODE:
1341 type = "vnode";
1342 break;
1343 case MD_SWAP:
1344 type = "swap";
1345 break;
1346 default:
1347 type = "unknown";
1348 break;
1349 }
1350
1351 if (pp != NULL) {
1352 if (indent == NULL) {
1353 sbuf_printf(sb, " u %d", mp->unit);
1354 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize);
1355 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads);
1356 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors);
1357 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize);
1358 sbuf_printf(sb, " t %s", type);
1359 if (mp->type == MD_VNODE && mp->vnode != NULL)
1360 sbuf_printf(sb, " file %s", mp->file);
1361 } else {
1362 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent,
1363 mp->unit);
1364 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n",
1365 indent, (uintmax_t) mp->sectorsize);
1366 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n",
1367 indent, (uintmax_t) mp->fwheads);
1368 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n",
1369 indent, (uintmax_t) mp->fwsectors);
1370 sbuf_printf(sb, "%s<length>%ju</length>\n",
1371 indent, (uintmax_t) mp->mediasize);
1372 sbuf_printf(sb, "%s<type>%s</type>\n", indent,
1373 type);
1374 if (mp->type == MD_VNODE && mp->vnode != NULL)
1375 sbuf_printf(sb, "%s<file>%s</file>\n",
1376 indent, mp->file);
1377 }
1378 }
1379}
1380
1381static void
1382g_md_fini(struct g_class *mp __unused)
1383{
1384
1385 sx_destroy(&md_sx);
1386 if (status_dev != NULL)
1387 destroy_dev(status_dev);
1388 delete_unrhdr(md_uh);
1389}
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: head/sys/dev/md/md.c 221855 2011-05-13 19:35:01Z mdf $
10 *
11 */
12
13/*-
14 * The following functions are based in the vn(4) driver: mdstart_swap(),
15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(),
16 * and as such under the following copyright:
17 *
18 * Copyright (c) 1988 University of Utah.
19 * Copyright (c) 1990, 1993
20 * The Regents of the University of California. All rights reserved.
21 *
22 * This code is derived from software contributed to Berkeley by
23 * the Systems Programming Group of the University of Utah Computer
24 * Science Department.
25 *
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions
28 * are met:
29 * 1. Redistributions of source code must retain the above copyright
30 * notice, this list of conditions and the following disclaimer.
31 * 2. Redistributions in binary form must reproduce the above copyright
32 * notice, this list of conditions and the following disclaimer in the
33 * documentation and/or other materials provided with the distribution.
34 * 4. Neither the name of the University nor the names of its contributors
35 * may be used to endorse or promote products derived from this software
36 * without specific prior written permission.
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 *
50 * from: Utah Hdr: vn.c 1.13 94/04/02
51 *
52 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94
53 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03
54 */
55
56#include "opt_geom.h"
57#include "opt_md.h"
58
59#include <sys/param.h>
60#include <sys/systm.h>
61#include <sys/bio.h>
62#include <sys/conf.h>
63#include <sys/devicestat.h>
64#include <sys/fcntl.h>
65#include <sys/kernel.h>
66#include <sys/kthread.h>
67#include <sys/limits.h>
68#include <sys/linker.h>
69#include <sys/lock.h>
70#include <sys/malloc.h>
71#include <sys/mdioctl.h>
72#include <sys/mount.h>
73#include <sys/mutex.h>
74#include <sys/sx.h>
75#include <sys/namei.h>
76#include <sys/proc.h>
77#include <sys/queue.h>
78#include <sys/sched.h>
79#include <sys/sf_buf.h>
80#include <sys/sysctl.h>
81#include <sys/vnode.h>
82
83#include <geom/geom.h>
84
85#include <vm/vm.h>
86#include <vm/vm_object.h>
87#include <vm/vm_page.h>
88#include <vm/vm_pager.h>
89#include <vm/swap_pager.h>
90#include <vm/uma.h>
91
92#include <machine/vmparam.h>
93
94#define MD_MODVER 1
95
96#define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */
97#define MD_EXITING 0x20000 /* Worker thread is exiting. */
98
99#ifndef MD_NSECT
100#define MD_NSECT (10000 * 2)
101#endif
102
103static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk");
104static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors");
105
106static int md_debug;
107SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, "");
108static int md_malloc_wait;
109SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, "");
110
111#if defined(MD_ROOT) && defined(MD_ROOT_SIZE)
112/*
113 * Preloaded image gets put here.
114 * Applications that patch the object with the image can determine
115 * the size looking at the start and end markers (strings),
116 * so we want them contiguous.
117 */
118static struct {
119 u_char start[MD_ROOT_SIZE*1024];
120 u_char end[128];
121} mfs_root = {
122 .start = "MFS Filesystem goes here",
123 .end = "MFS Filesystem had better STOP here",
124};
125#endif
126
127static g_init_t g_md_init;
128static g_fini_t g_md_fini;
129static g_start_t g_md_start;
130static g_access_t g_md_access;
131static void g_md_dumpconf(struct sbuf *sb, const char *indent,
132 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp);
133
134static int mdunits;
135static struct cdev *status_dev = 0;
136static struct sx md_sx;
137static struct unrhdr *md_uh;
138
139static d_ioctl_t mdctlioctl;
140
141static struct cdevsw mdctl_cdevsw = {
142 .d_version = D_VERSION,
143 .d_ioctl = mdctlioctl,
144 .d_name = MD_NAME,
145};
146
147struct g_class g_md_class = {
148 .name = "MD",
149 .version = G_VERSION,
150 .init = g_md_init,
151 .fini = g_md_fini,
152 .start = g_md_start,
153 .access = g_md_access,
154 .dumpconf = g_md_dumpconf,
155};
156
157DECLARE_GEOM_CLASS(g_md_class, g_md);
158
159
160static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list);
161
162#define NINDIR (PAGE_SIZE / sizeof(uintptr_t))
163#define NMASK (NINDIR-1)
164static int nshift;
165
166struct indir {
167 uintptr_t *array;
168 u_int total;
169 u_int used;
170 u_int shift;
171};
172
173struct md_s {
174 int unit;
175 LIST_ENTRY(md_s) list;
176 struct bio_queue_head bio_queue;
177 struct mtx queue_mtx;
178 struct cdev *dev;
179 enum md_types type;
180 off_t mediasize;
181 unsigned sectorsize;
182 unsigned opencount;
183 unsigned fwheads;
184 unsigned fwsectors;
185 unsigned flags;
186 char name[20];
187 struct proc *procp;
188 struct g_geom *gp;
189 struct g_provider *pp;
190 int (*start)(struct md_s *sc, struct bio *bp);
191 struct devstat *devstat;
192
193 /* MD_MALLOC related fields */
194 struct indir *indir;
195 uma_zone_t uma;
196
197 /* MD_PRELOAD related fields */
198 u_char *pl_ptr;
199 size_t pl_len;
200
201 /* MD_VNODE related fields */
202 struct vnode *vnode;
203 char file[PATH_MAX];
204 struct ucred *cred;
205
206 /* MD_SWAP related fields */
207 vm_object_t object;
208};
209
210static struct indir *
211new_indir(u_int shift)
212{
213 struct indir *ip;
214
215 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT)
216 | M_ZERO);
217 if (ip == NULL)
218 return (NULL);
219 ip->array = malloc(sizeof(uintptr_t) * NINDIR,
220 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO);
221 if (ip->array == NULL) {
222 free(ip, M_MD);
223 return (NULL);
224 }
225 ip->total = NINDIR;
226 ip->shift = shift;
227 return (ip);
228}
229
230static void
231del_indir(struct indir *ip)
232{
233
234 free(ip->array, M_MDSECT);
235 free(ip, M_MD);
236}
237
238static void
239destroy_indir(struct md_s *sc, struct indir *ip)
240{
241 int i;
242
243 for (i = 0; i < NINDIR; i++) {
244 if (!ip->array[i])
245 continue;
246 if (ip->shift)
247 destroy_indir(sc, (struct indir*)(ip->array[i]));
248 else if (ip->array[i] > 255)
249 uma_zfree(sc->uma, (void *)(ip->array[i]));
250 }
251 del_indir(ip);
252}
253
254/*
255 * This function does the math and allocates the top level "indir" structure
256 * for a device of "size" sectors.
257 */
258
259static struct indir *
260dimension(off_t size)
261{
262 off_t rcnt;
263 struct indir *ip;
264 int layer;
265
266 rcnt = size;
267 layer = 0;
268 while (rcnt > NINDIR) {
269 rcnt /= NINDIR;
270 layer++;
271 }
272
273 /*
274 * XXX: the top layer is probably not fully populated, so we allocate
275 * too much space for ip->array in here.
276 */
277 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO);
278 ip->array = malloc(sizeof(uintptr_t) * NINDIR,
279 M_MDSECT, M_WAITOK | M_ZERO);
280 ip->total = NINDIR;
281 ip->shift = layer * nshift;
282 return (ip);
283}
284
285/*
286 * Read a given sector
287 */
288
289static uintptr_t
290s_read(struct indir *ip, off_t offset)
291{
292 struct indir *cip;
293 int idx;
294 uintptr_t up;
295
296 if (md_debug > 1)
297 printf("s_read(%jd)\n", (intmax_t)offset);
298 up = 0;
299 for (cip = ip; cip != NULL;) {
300 if (cip->shift) {
301 idx = (offset >> cip->shift) & NMASK;
302 up = cip->array[idx];
303 cip = (struct indir *)up;
304 continue;
305 }
306 idx = offset & NMASK;
307 return (cip->array[idx]);
308 }
309 return (0);
310}
311
312/*
313 * Write a given sector, prune the tree if the value is 0
314 */
315
316static int
317s_write(struct indir *ip, off_t offset, uintptr_t ptr)
318{
319 struct indir *cip, *lip[10];
320 int idx, li;
321 uintptr_t up;
322
323 if (md_debug > 1)
324 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr);
325 up = 0;
326 li = 0;
327 cip = ip;
328 for (;;) {
329 lip[li++] = cip;
330 if (cip->shift) {
331 idx = (offset >> cip->shift) & NMASK;
332 up = cip->array[idx];
333 if (up != 0) {
334 cip = (struct indir *)up;
335 continue;
336 }
337 /* Allocate branch */
338 cip->array[idx] =
339 (uintptr_t)new_indir(cip->shift - nshift);
340 if (cip->array[idx] == 0)
341 return (ENOSPC);
342 cip->used++;
343 up = cip->array[idx];
344 cip = (struct indir *)up;
345 continue;
346 }
347 /* leafnode */
348 idx = offset & NMASK;
349 up = cip->array[idx];
350 if (up != 0)
351 cip->used--;
352 cip->array[idx] = ptr;
353 if (ptr != 0)
354 cip->used++;
355 break;
356 }
357 if (cip->used != 0 || li == 1)
358 return (0);
359 li--;
360 while (cip->used == 0 && cip != ip) {
361 li--;
362 idx = (offset >> lip[li]->shift) & NMASK;
363 up = lip[li]->array[idx];
364 KASSERT(up == (uintptr_t)cip, ("md screwed up"));
365 del_indir(cip);
366 lip[li]->array[idx] = 0;
367 lip[li]->used--;
368 cip = lip[li];
369 }
370 return (0);
371}
372
373
374static int
375g_md_access(struct g_provider *pp, int r, int w, int e)
376{
377 struct md_s *sc;
378
379 sc = pp->geom->softc;
380 if (sc == NULL) {
381 if (r <= 0 && w <= 0 && e <= 0)
382 return (0);
383 return (ENXIO);
384 }
385 r += pp->acr;
386 w += pp->acw;
387 e += pp->ace;
388 if ((sc->flags & MD_READONLY) != 0 && w > 0)
389 return (EROFS);
390 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
391 sc->opencount = 1;
392 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
393 sc->opencount = 0;
394 }
395 return (0);
396}
397
398static void
399g_md_start(struct bio *bp)
400{
401 struct md_s *sc;
402
403 sc = bp->bio_to->geom->softc;
404 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE))
405 devstat_start_transaction_bio(sc->devstat, bp);
406 mtx_lock(&sc->queue_mtx);
407 bioq_disksort(&sc->bio_queue, bp);
408 mtx_unlock(&sc->queue_mtx);
409 wakeup(sc);
410}
411
412static int
413mdstart_malloc(struct md_s *sc, struct bio *bp)
414{
415 int i, error;
416 u_char *dst;
417 off_t secno, nsec, uc;
418 uintptr_t sp, osp;
419
420 switch (bp->bio_cmd) {
421 case BIO_READ:
422 case BIO_WRITE:
423 case BIO_DELETE:
424 break;
425 default:
426 return (EOPNOTSUPP);
427 }
428
429 nsec = bp->bio_length / sc->sectorsize;
430 secno = bp->bio_offset / sc->sectorsize;
431 dst = bp->bio_data;
432 error = 0;
433 while (nsec--) {
434 osp = s_read(sc->indir, secno);
435 if (bp->bio_cmd == BIO_DELETE) {
436 if (osp != 0)
437 error = s_write(sc->indir, secno, 0);
438 } else if (bp->bio_cmd == BIO_READ) {
439 if (osp == 0)
440 bzero(dst, sc->sectorsize);
441 else if (osp <= 255)
442 memset(dst, osp, sc->sectorsize);
443 else {
444 bcopy((void *)osp, dst, sc->sectorsize);
445 cpu_flush_dcache(dst, sc->sectorsize);
446 }
447 osp = 0;
448 } else if (bp->bio_cmd == BIO_WRITE) {
449 if (sc->flags & MD_COMPRESS) {
450 uc = dst[0];
451 for (i = 1; i < sc->sectorsize; i++)
452 if (dst[i] != uc)
453 break;
454 } else {
455 i = 0;
456 uc = 0;
457 }
458 if (i == sc->sectorsize) {
459 if (osp != uc)
460 error = s_write(sc->indir, secno, uc);
461 } else {
462 if (osp <= 255) {
463 sp = (uintptr_t)uma_zalloc(sc->uma,
464 md_malloc_wait ? M_WAITOK :
465 M_NOWAIT);
466 if (sp == 0) {
467 error = ENOSPC;
468 break;
469 }
470 bcopy(dst, (void *)sp, sc->sectorsize);
471 error = s_write(sc->indir, secno, sp);
472 } else {
473 bcopy(dst, (void *)osp, sc->sectorsize);
474 osp = 0;
475 }
476 }
477 } else {
478 error = EOPNOTSUPP;
479 }
480 if (osp > 255)
481 uma_zfree(sc->uma, (void*)osp);
482 if (error != 0)
483 break;
484 secno++;
485 dst += sc->sectorsize;
486 }
487 bp->bio_resid = 0;
488 return (error);
489}
490
491static int
492mdstart_preload(struct md_s *sc, struct bio *bp)
493{
494
495 switch (bp->bio_cmd) {
496 case BIO_READ:
497 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data,
498 bp->bio_length);
499 cpu_flush_dcache(bp->bio_data, bp->bio_length);
500 break;
501 case BIO_WRITE:
502 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset,
503 bp->bio_length);
504 break;
505 }
506 bp->bio_resid = 0;
507 return (0);
508}
509
510static int
511mdstart_vnode(struct md_s *sc, struct bio *bp)
512{
513 int error, vfslocked;
514 struct uio auio;
515 struct iovec aiov;
516 struct mount *mp;
517 struct vnode *vp;
518 struct thread *td;
519 off_t end, zerosize;
520
521 switch (bp->bio_cmd) {
522 case BIO_READ:
523 case BIO_WRITE:
524 case BIO_DELETE:
525 case BIO_FLUSH:
526 break;
527 default:
528 return (EOPNOTSUPP);
529 }
530
531 td = curthread;
532 vp = sc->vnode;
533
534 /*
535 * VNODE I/O
536 *
537 * If an error occurs, we set BIO_ERROR but we do not set
538 * B_INVAL because (for a write anyway), the buffer is
539 * still valid.
540 */
541
542 if (bp->bio_cmd == BIO_FLUSH) {
543 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
544 (void) vn_start_write(vp, &mp, V_WAIT);
545 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
546 error = VOP_FSYNC(vp, MNT_WAIT, td);
547 VOP_UNLOCK(vp, 0);
548 vn_finished_write(mp);
549 VFS_UNLOCK_GIANT(vfslocked);
550 return (error);
551 }
552
553 bzero(&auio, sizeof(auio));
554
555 /*
556 * Special case for BIO_DELETE. On the surface, this is very
557 * similar to BIO_WRITE, except that we write from our own
558 * fixed-length buffer, so we have to loop. The net result is
559 * that the two cases end up having very little in common.
560 */
561 if (bp->bio_cmd == BIO_DELETE) {
562 zerosize = ZERO_REGION_SIZE -
563 (ZERO_REGION_SIZE % sc->sectorsize);
564 auio.uio_iov = &aiov;
565 auio.uio_iovcnt = 1;
566 auio.uio_offset = (vm_ooffset_t)bp->bio_offset;
567 auio.uio_segflg = UIO_SYSSPACE;
568 auio.uio_rw = UIO_WRITE;
569 auio.uio_td = td;
570 end = bp->bio_offset + bp->bio_length;
571 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
572 (void) vn_start_write(vp, &mp, V_WAIT);
573 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
574 error = 0;
575 while (auio.uio_offset < end) {
576 aiov.iov_base = __DECONST(void *, zero_region);
577 aiov.iov_len = end - auio.uio_offset;
578 if (aiov.iov_len > zerosize)
579 aiov.iov_len = zerosize;
580 auio.uio_resid = aiov.iov_len;
581 error = VOP_WRITE(vp, &auio,
582 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred);
583 if (error != 0)
584 break;
585 }
586 VOP_UNLOCK(vp, 0);
587 vn_finished_write(mp);
588 bp->bio_resid = end - auio.uio_offset;
589 VFS_UNLOCK_GIANT(vfslocked);
590 return (error);
591 }
592
593 aiov.iov_base = bp->bio_data;
594 aiov.iov_len = bp->bio_length;
595 auio.uio_iov = &aiov;
596 auio.uio_iovcnt = 1;
597 auio.uio_offset = (vm_ooffset_t)bp->bio_offset;
598 auio.uio_segflg = UIO_SYSSPACE;
599 if (bp->bio_cmd == BIO_READ)
600 auio.uio_rw = UIO_READ;
601 else if (bp->bio_cmd == BIO_WRITE)
602 auio.uio_rw = UIO_WRITE;
603 else
604 panic("wrong BIO_OP in mdstart_vnode");
605 auio.uio_resid = bp->bio_length;
606 auio.uio_td = td;
607 /*
608 * When reading set IO_DIRECT to try to avoid double-caching
609 * the data. When writing IO_DIRECT is not optimal.
610 */
611 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
612 if (bp->bio_cmd == BIO_READ) {
613 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
614 error = VOP_READ(vp, &auio, IO_DIRECT, sc->cred);
615 VOP_UNLOCK(vp, 0);
616 } else {
617 (void) vn_start_write(vp, &mp, V_WAIT);
618 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
619 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC,
620 sc->cred);
621 VOP_UNLOCK(vp, 0);
622 vn_finished_write(mp);
623 }
624 VFS_UNLOCK_GIANT(vfslocked);
625 bp->bio_resid = auio.uio_resid;
626 return (error);
627}
628
629static int
630mdstart_swap(struct md_s *sc, struct bio *bp)
631{
632 struct sf_buf *sf;
633 int rv, offs, len, lastend;
634 vm_pindex_t i, lastp;
635 vm_page_t m;
636 u_char *p;
637
638 switch (bp->bio_cmd) {
639 case BIO_READ:
640 case BIO_WRITE:
641 case BIO_DELETE:
642 break;
643 default:
644 return (EOPNOTSUPP);
645 }
646
647 p = bp->bio_data;
648
649 /*
650 * offs is the offset at which to start operating on the
651 * next (ie, first) page. lastp is the last page on
652 * which we're going to operate. lastend is the ending
653 * position within that last page (ie, PAGE_SIZE if
654 * we're operating on complete aligned pages).
655 */
656 offs = bp->bio_offset % PAGE_SIZE;
657 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE;
658 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1;
659
660 rv = VM_PAGER_OK;
661 VM_OBJECT_LOCK(sc->object);
662 vm_object_pip_add(sc->object, 1);
663 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) {
664 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs;
665
666 m = vm_page_grab(sc->object, i,
667 VM_ALLOC_NORMAL|VM_ALLOC_RETRY);
668 VM_OBJECT_UNLOCK(sc->object);
669 sched_pin();
670 sf = sf_buf_alloc(m, SFB_CPUPRIVATE);
671 VM_OBJECT_LOCK(sc->object);
672 if (bp->bio_cmd == BIO_READ) {
673 if (m->valid != VM_PAGE_BITS_ALL)
674 rv = vm_pager_get_pages(sc->object, &m, 1, 0);
675 if (rv == VM_PAGER_ERROR) {
676 sf_buf_free(sf);
677 sched_unpin();
678 vm_page_wakeup(m);
679 break;
680 }
681 bcopy((void *)(sf_buf_kva(sf) + offs), p, len);
682 cpu_flush_dcache(p, len);
683 } else if (bp->bio_cmd == BIO_WRITE) {
684 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL)
685 rv = vm_pager_get_pages(sc->object, &m, 1, 0);
686 if (rv == VM_PAGER_ERROR) {
687 sf_buf_free(sf);
688 sched_unpin();
689 vm_page_wakeup(m);
690 break;
691 }
692 bcopy(p, (void *)(sf_buf_kva(sf) + offs), len);
693 m->valid = VM_PAGE_BITS_ALL;
694 } else if (bp->bio_cmd == BIO_DELETE) {
695 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL)
696 rv = vm_pager_get_pages(sc->object, &m, 1, 0);
697 if (rv == VM_PAGER_ERROR) {
698 sf_buf_free(sf);
699 sched_unpin();
700 vm_page_wakeup(m);
701 break;
702 }
703 if (len != PAGE_SIZE) {
704 bzero((void *)(sf_buf_kva(sf) + offs), len);
705 vm_page_clear_dirty(m, offs, len);
706 m->valid = VM_PAGE_BITS_ALL;
707 } else
708 vm_pager_page_unswapped(m);
709 }
710 sf_buf_free(sf);
711 sched_unpin();
712 vm_page_wakeup(m);
713 vm_page_lock(m);
714 if (bp->bio_cmd == BIO_DELETE && len == PAGE_SIZE)
715 vm_page_free(m);
716 else
717 vm_page_activate(m);
718 vm_page_unlock(m);
719 if (bp->bio_cmd == BIO_WRITE)
720 vm_page_dirty(m);
721
722 /* Actions on further pages start at offset 0 */
723 p += PAGE_SIZE - offs;
724 offs = 0;
725#if 0
726if (bootverbose || bp->bio_offset / PAGE_SIZE < 17)
727printf("wire_count %d busy %d flags %x hold_count %d act_count %d queue %d valid %d dirty %d @ %d\n",
728 m->wire_count, m->busy,
729 m->flags, m->hold_count, m->act_count, m->queue, m->valid, m->dirty, i);
730#endif
731 }
732 vm_object_pip_subtract(sc->object, 1);
733 VM_OBJECT_UNLOCK(sc->object);
734 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC);
735}
736
737static void
738md_kthread(void *arg)
739{
740 struct md_s *sc;
741 struct bio *bp;
742 int error;
743
744 sc = arg;
745 thread_lock(curthread);
746 sched_prio(curthread, PRIBIO);
747 thread_unlock(curthread);
748 if (sc->type == MD_VNODE)
749 curthread->td_pflags |= TDP_NORUNNINGBUF;
750
751 for (;;) {
752 mtx_lock(&sc->queue_mtx);
753 if (sc->flags & MD_SHUTDOWN) {
754 sc->flags |= MD_EXITING;
755 mtx_unlock(&sc->queue_mtx);
756 kproc_exit(0);
757 }
758 bp = bioq_takefirst(&sc->bio_queue);
759 if (!bp) {
760 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0);
761 continue;
762 }
763 mtx_unlock(&sc->queue_mtx);
764 if (bp->bio_cmd == BIO_GETATTR) {
765 if ((sc->fwsectors && sc->fwheads &&
766 (g_handleattr_int(bp, "GEOM::fwsectors",
767 sc->fwsectors) ||
768 g_handleattr_int(bp, "GEOM::fwheads",
769 sc->fwheads))) ||
770 g_handleattr_int(bp, "GEOM::candelete", 1))
771 error = -1;
772 else
773 error = EOPNOTSUPP;
774 } else {
775 error = sc->start(sc, bp);
776 }
777
778 if (error != -1) {
779 bp->bio_completed = bp->bio_length;
780 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE))
781 devstat_end_transaction_bio(sc->devstat, bp);
782 g_io_deliver(bp, error);
783 }
784 }
785}
786
787static struct md_s *
788mdfind(int unit)
789{
790 struct md_s *sc;
791
792 LIST_FOREACH(sc, &md_softc_list, list) {
793 if (sc->unit == unit)
794 break;
795 }
796 return (sc);
797}
798
799static struct md_s *
800mdnew(int unit, int *errp, enum md_types type)
801{
802 struct md_s *sc;
803 int error;
804
805 *errp = 0;
806 if (unit == -1)
807 unit = alloc_unr(md_uh);
808 else
809 unit = alloc_unr_specific(md_uh, unit);
810
811 if (unit == -1) {
812 *errp = EBUSY;
813 return (NULL);
814 }
815
816 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO);
817 sc->type = type;
818 bioq_init(&sc->bio_queue);
819 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF);
820 sc->unit = unit;
821 sprintf(sc->name, "md%d", unit);
822 LIST_INSERT_HEAD(&md_softc_list, sc, list);
823 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name);
824 if (error == 0)
825 return (sc);
826 LIST_REMOVE(sc, list);
827 mtx_destroy(&sc->queue_mtx);
828 free_unr(md_uh, sc->unit);
829 free(sc, M_MD);
830 *errp = error;
831 return (NULL);
832}
833
834static void
835mdinit(struct md_s *sc)
836{
837 struct g_geom *gp;
838 struct g_provider *pp;
839
840 g_topology_lock();
841 gp = g_new_geomf(&g_md_class, "md%d", sc->unit);
842 gp->softc = sc;
843 pp = g_new_providerf(gp, "md%d", sc->unit);
844 pp->mediasize = sc->mediasize;
845 pp->sectorsize = sc->sectorsize;
846 sc->gp = gp;
847 sc->pp = pp;
848 g_error_provider(pp, 0);
849 g_topology_unlock();
850 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize,
851 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
852}
853
854/*
855 * XXX: we should check that the range they feed us is mapped.
856 * XXX: we should implement read-only.
857 */
858
859static int
860mdcreate_preload(struct md_s *sc, struct md_ioctl *mdio)
861{
862
863 if (mdio->md_options & ~(MD_AUTOUNIT | MD_FORCE))
864 return (EINVAL);
865 if (mdio->md_base == 0)
866 return (EINVAL);
867 sc->flags = mdio->md_options & MD_FORCE;
868 /* Cast to pointer size, then to pointer to avoid warning */
869 sc->pl_ptr = (u_char *)(uintptr_t)mdio->md_base;
870 sc->pl_len = (size_t)sc->mediasize;
871 return (0);
872}
873
874
875static int
876mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio)
877{
878 uintptr_t sp;
879 int error;
880 off_t u;
881
882 error = 0;
883 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE))
884 return (EINVAL);
885 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize))
886 return (EINVAL);
887 /* Compression doesn't make sense if we have reserved space */
888 if (mdio->md_options & MD_RESERVE)
889 mdio->md_options &= ~MD_COMPRESS;
890 if (mdio->md_fwsectors != 0)
891 sc->fwsectors = mdio->md_fwsectors;
892 if (mdio->md_fwheads != 0)
893 sc->fwheads = mdio->md_fwheads;
894 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE);
895 sc->indir = dimension(sc->mediasize / sc->sectorsize);
896 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL,
897 0x1ff, 0);
898 if (mdio->md_options & MD_RESERVE) {
899 off_t nsectors;
900
901 nsectors = sc->mediasize / sc->sectorsize;
902 for (u = 0; u < nsectors; u++) {
903 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ?
904 M_WAITOK : M_NOWAIT) | M_ZERO);
905 if (sp != 0)
906 error = s_write(sc->indir, u, sp);
907 else
908 error = ENOMEM;
909 if (error != 0)
910 break;
911 }
912 }
913 return (error);
914}
915
916
917static int
918mdsetcred(struct md_s *sc, struct ucred *cred)
919{
920 char *tmpbuf;
921 int error = 0;
922
923 /*
924 * Set credits in our softc
925 */
926
927 if (sc->cred)
928 crfree(sc->cred);
929 sc->cred = crhold(cred);
930
931 /*
932 * Horrible kludge to establish credentials for NFS XXX.
933 */
934
935 if (sc->vnode) {
936 struct uio auio;
937 struct iovec aiov;
938
939 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK);
940 bzero(&auio, sizeof(auio));
941
942 aiov.iov_base = tmpbuf;
943 aiov.iov_len = sc->sectorsize;
944 auio.uio_iov = &aiov;
945 auio.uio_iovcnt = 1;
946 auio.uio_offset = 0;
947 auio.uio_rw = UIO_READ;
948 auio.uio_segflg = UIO_SYSSPACE;
949 auio.uio_resid = aiov.iov_len;
950 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY);
951 error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
952 VOP_UNLOCK(sc->vnode, 0);
953 free(tmpbuf, M_TEMP);
954 }
955 return (error);
956}
957
958static int
959mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td)
960{
961 struct vattr vattr;
962 struct nameidata nd;
963 char *fname;
964 int error, flags, vfslocked;
965
966 /*
967 * Kernel-originated requests must have the filename appended
968 * to the mdio structure to protect against malicious software.
969 */
970 fname = mdio->md_file;
971 if ((void *)fname != (void *)(mdio + 1)) {
972 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL);
973 if (error != 0)
974 return (error);
975 } else
976 strlcpy(sc->file, fname, sizeof(sc->file));
977
978 /*
979 * If the user specified that this is a read only device, don't
980 * set the FWRITE mask before trying to open the backing store.
981 */
982 flags = FREAD | ((mdio->md_options & MD_READONLY) ? 0 : FWRITE);
983 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, sc->file, td);
984 error = vn_open(&nd, &flags, 0, NULL);
985 if (error != 0)
986 return (error);
987 vfslocked = NDHASGIANT(&nd);
988 NDFREE(&nd, NDF_ONLY_PNBUF);
989 if (nd.ni_vp->v_type != VREG) {
990 error = EINVAL;
991 goto bad;
992 }
993 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred);
994 if (error != 0)
995 goto bad;
996 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) {
997 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY);
998 if (nd.ni_vp->v_iflag & VI_DOOMED) {
999 /* Forced unmount. */
1000 error = EBADF;
1001 goto bad;
1002 }
1003 }
1004 nd.ni_vp->v_vflag |= VV_MD;
1005 VOP_UNLOCK(nd.ni_vp, 0);
1006
1007 if (mdio->md_fwsectors != 0)
1008 sc->fwsectors = mdio->md_fwsectors;
1009 if (mdio->md_fwheads != 0)
1010 sc->fwheads = mdio->md_fwheads;
1011 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC);
1012 if (!(flags & FWRITE))
1013 sc->flags |= MD_READONLY;
1014 sc->vnode = nd.ni_vp;
1015
1016 error = mdsetcred(sc, td->td_ucred);
1017 if (error != 0) {
1018 sc->vnode = NULL;
1019 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
1020 nd.ni_vp->v_vflag &= ~VV_MD;
1021 goto bad;
1022 }
1023 VFS_UNLOCK_GIANT(vfslocked);
1024 return (0);
1025bad:
1026 VOP_UNLOCK(nd.ni_vp, 0);
1027 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td);
1028 VFS_UNLOCK_GIANT(vfslocked);
1029 return (error);
1030}
1031
1032static int
1033mddestroy(struct md_s *sc, struct thread *td)
1034{
1035 int vfslocked;
1036
1037 if (sc->gp) {
1038 sc->gp->softc = NULL;
1039 g_topology_lock();
1040 g_wither_geom(sc->gp, ENXIO);
1041 g_topology_unlock();
1042 sc->gp = NULL;
1043 sc->pp = NULL;
1044 }
1045 if (sc->devstat) {
1046 devstat_remove_entry(sc->devstat);
1047 sc->devstat = NULL;
1048 }
1049 mtx_lock(&sc->queue_mtx);
1050 sc->flags |= MD_SHUTDOWN;
1051 wakeup(sc);
1052 while (!(sc->flags & MD_EXITING))
1053 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10);
1054 mtx_unlock(&sc->queue_mtx);
1055 mtx_destroy(&sc->queue_mtx);
1056 if (sc->vnode != NULL) {
1057 vfslocked = VFS_LOCK_GIANT(sc->vnode->v_mount);
1058 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY);
1059 sc->vnode->v_vflag &= ~VV_MD;
1060 VOP_UNLOCK(sc->vnode, 0);
1061 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ?
1062 FREAD : (FREAD|FWRITE), sc->cred, td);
1063 VFS_UNLOCK_GIANT(vfslocked);
1064 }
1065 if (sc->cred != NULL)
1066 crfree(sc->cred);
1067 if (sc->object != NULL)
1068 vm_object_deallocate(sc->object);
1069 if (sc->indir)
1070 destroy_indir(sc, sc->indir);
1071 if (sc->uma)
1072 uma_zdestroy(sc->uma);
1073
1074 LIST_REMOVE(sc, list);
1075 free_unr(md_uh, sc->unit);
1076 free(sc, M_MD);
1077 return (0);
1078}
1079
1080static int
1081mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td)
1082{
1083 vm_ooffset_t npage;
1084 int error;
1085
1086 /*
1087 * Range check. Disallow negative sizes or any size less then the
1088 * size of a page. Then round to a page.
1089 */
1090 if (sc->mediasize == 0 || (sc->mediasize % PAGE_SIZE) != 0)
1091 return (EDOM);
1092
1093 /*
1094 * Allocate an OBJT_SWAP object.
1095 *
1096 * Note the truncation.
1097 */
1098
1099 npage = mdio->md_mediasize / PAGE_SIZE;
1100 if (mdio->md_fwsectors != 0)
1101 sc->fwsectors = mdio->md_fwsectors;
1102 if (mdio->md_fwheads != 0)
1103 sc->fwheads = mdio->md_fwheads;
1104 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage,
1105 VM_PROT_DEFAULT, 0, td->td_ucred);
1106 if (sc->object == NULL)
1107 return (ENOMEM);
1108 sc->flags = mdio->md_options & MD_FORCE;
1109 if (mdio->md_options & MD_RESERVE) {
1110 if (swap_pager_reserve(sc->object, 0, npage) < 0) {
1111 error = EDOM;
1112 goto finish;
1113 }
1114 }
1115 error = mdsetcred(sc, td->td_ucred);
1116 finish:
1117 if (error != 0) {
1118 vm_object_deallocate(sc->object);
1119 sc->object = NULL;
1120 }
1121 return (error);
1122}
1123
1124
1125static int
1126xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
1127{
1128 struct md_ioctl *mdio;
1129 struct md_s *sc;
1130 int error, i;
1131
1132 if (md_debug)
1133 printf("mdctlioctl(%s %lx %p %x %p)\n",
1134 devtoname(dev), cmd, addr, flags, td);
1135
1136 mdio = (struct md_ioctl *)addr;
1137 if (mdio->md_version != MDIOVERSION)
1138 return (EINVAL);
1139
1140 /*
1141 * We assert the version number in the individual ioctl
1142 * handlers instead of out here because (a) it is possible we
1143 * may add another ioctl in the future which doesn't read an
1144 * mdio, and (b) the correct return value for an unknown ioctl
1145 * is ENOIOCTL, not EINVAL.
1146 */
1147 error = 0;
1148 switch (cmd) {
1149 case MDIOCATTACH:
1150 switch (mdio->md_type) {
1151 case MD_MALLOC:
1152 case MD_PRELOAD:
1153 case MD_VNODE:
1154 case MD_SWAP:
1155 break;
1156 default:
1157 return (EINVAL);
1158 }
1159 if (mdio->md_options & MD_AUTOUNIT)
1160 sc = mdnew(-1, &error, mdio->md_type);
1161 else {
1162 if (mdio->md_unit > INT_MAX)
1163 return (EINVAL);
1164 sc = mdnew(mdio->md_unit, &error, mdio->md_type);
1165 }
1166 if (sc == NULL)
1167 return (error);
1168 if (mdio->md_options & MD_AUTOUNIT)
1169 mdio->md_unit = sc->unit;
1170 sc->mediasize = mdio->md_mediasize;
1171 if (mdio->md_sectorsize == 0)
1172 sc->sectorsize = DEV_BSIZE;
1173 else
1174 sc->sectorsize = mdio->md_sectorsize;
1175 error = EDOOFUS;
1176 switch (sc->type) {
1177 case MD_MALLOC:
1178 sc->start = mdstart_malloc;
1179 error = mdcreate_malloc(sc, mdio);
1180 break;
1181 case MD_PRELOAD:
1182 sc->start = mdstart_preload;
1183 error = mdcreate_preload(sc, mdio);
1184 break;
1185 case MD_VNODE:
1186 sc->start = mdstart_vnode;
1187 error = mdcreate_vnode(sc, mdio, td);
1188 break;
1189 case MD_SWAP:
1190 sc->start = mdstart_swap;
1191 error = mdcreate_swap(sc, mdio, td);
1192 break;
1193 }
1194 if (error != 0) {
1195 mddestroy(sc, td);
1196 return (error);
1197 }
1198
1199 /* Prune off any residual fractional sector */
1200 i = sc->mediasize % sc->sectorsize;
1201 sc->mediasize -= i;
1202
1203 mdinit(sc);
1204 return (0);
1205 case MDIOCDETACH:
1206 if (mdio->md_mediasize != 0 ||
1207 (mdio->md_options & ~MD_FORCE) != 0)
1208 return (EINVAL);
1209
1210 sc = mdfind(mdio->md_unit);
1211 if (sc == NULL)
1212 return (ENOENT);
1213 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) &&
1214 !(mdio->md_options & MD_FORCE))
1215 return (EBUSY);
1216 return (mddestroy(sc, td));
1217 case MDIOCQUERY:
1218 sc = mdfind(mdio->md_unit);
1219 if (sc == NULL)
1220 return (ENOENT);
1221 mdio->md_type = sc->type;
1222 mdio->md_options = sc->flags;
1223 mdio->md_mediasize = sc->mediasize;
1224 mdio->md_sectorsize = sc->sectorsize;
1225 if (sc->type == MD_VNODE)
1226 error = copyout(sc->file, mdio->md_file,
1227 strlen(sc->file) + 1);
1228 return (error);
1229 case MDIOCLIST:
1230 i = 1;
1231 LIST_FOREACH(sc, &md_softc_list, list) {
1232 if (i == MDNPAD - 1)
1233 mdio->md_pad[i] = -1;
1234 else
1235 mdio->md_pad[i++] = sc->unit;
1236 }
1237 mdio->md_pad[0] = i - 1;
1238 return (0);
1239 default:
1240 return (ENOIOCTL);
1241 };
1242}
1243
1244static int
1245mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
1246{
1247 int error;
1248
1249 sx_xlock(&md_sx);
1250 error = xmdctlioctl(dev, cmd, addr, flags, td);
1251 sx_xunlock(&md_sx);
1252 return (error);
1253}
1254
1255static void
1256md_preloaded(u_char *image, size_t length)
1257{
1258 struct md_s *sc;
1259 int error;
1260
1261 sc = mdnew(-1, &error, MD_PRELOAD);
1262 if (sc == NULL)
1263 return;
1264 sc->mediasize = length;
1265 sc->sectorsize = DEV_BSIZE;
1266 sc->pl_ptr = image;
1267 sc->pl_len = length;
1268 sc->start = mdstart_preload;
1269#ifdef MD_ROOT
1270 if (sc->unit == 0)
1271 rootdevnames[0] = "ufs:/dev/md0";
1272#endif
1273 mdinit(sc);
1274}
1275
1276static void
1277g_md_init(struct g_class *mp __unused)
1278{
1279 caddr_t mod;
1280 u_char *ptr, *name, *type;
1281 unsigned len;
1282 int i;
1283
1284 /* figure out log2(NINDIR) */
1285 for (i = NINDIR, nshift = -1; i; nshift++)
1286 i >>= 1;
1287
1288 mod = NULL;
1289 sx_init(&md_sx, "MD config lock");
1290 g_topology_unlock();
1291 md_uh = new_unrhdr(0, INT_MAX, NULL);
1292#ifdef MD_ROOT_SIZE
1293 sx_xlock(&md_sx);
1294 md_preloaded(mfs_root.start, sizeof(mfs_root.start));
1295 sx_xunlock(&md_sx);
1296#endif
1297 /* XXX: are preload_* static or do they need Giant ? */
1298 while ((mod = preload_search_next_name(mod)) != NULL) {
1299 name = (char *)preload_search_info(mod, MODINFO_NAME);
1300 if (name == NULL)
1301 continue;
1302 type = (char *)preload_search_info(mod, MODINFO_TYPE);
1303 if (type == NULL)
1304 continue;
1305 if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
1306 continue;
1307 ptr = preload_fetch_addr(mod);
1308 len = preload_fetch_size(mod);
1309 if (ptr != NULL && len != 0) {
1310 printf("%s%d: Preloaded image <%s> %d bytes at %p\n",
1311 MD_NAME, mdunits, name, len, ptr);
1312 sx_xlock(&md_sx);
1313 md_preloaded(ptr, len);
1314 sx_xunlock(&md_sx);
1315 }
1316 }
1317 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL,
1318 0600, MDCTL_NAME);
1319 g_topology_lock();
1320}
1321
1322static void
1323g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
1324 struct g_consumer *cp __unused, struct g_provider *pp)
1325{
1326 struct md_s *mp;
1327 char *type;
1328
1329 mp = gp->softc;
1330 if (mp == NULL)
1331 return;
1332
1333 switch (mp->type) {
1334 case MD_MALLOC:
1335 type = "malloc";
1336 break;
1337 case MD_PRELOAD:
1338 type = "preload";
1339 break;
1340 case MD_VNODE:
1341 type = "vnode";
1342 break;
1343 case MD_SWAP:
1344 type = "swap";
1345 break;
1346 default:
1347 type = "unknown";
1348 break;
1349 }
1350
1351 if (pp != NULL) {
1352 if (indent == NULL) {
1353 sbuf_printf(sb, " u %d", mp->unit);
1354 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize);
1355 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads);
1356 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors);
1357 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize);
1358 sbuf_printf(sb, " t %s", type);
1359 if (mp->type == MD_VNODE && mp->vnode != NULL)
1360 sbuf_printf(sb, " file %s", mp->file);
1361 } else {
1362 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent,
1363 mp->unit);
1364 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n",
1365 indent, (uintmax_t) mp->sectorsize);
1366 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n",
1367 indent, (uintmax_t) mp->fwheads);
1368 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n",
1369 indent, (uintmax_t) mp->fwsectors);
1370 sbuf_printf(sb, "%s<length>%ju</length>\n",
1371 indent, (uintmax_t) mp->mediasize);
1372 sbuf_printf(sb, "%s<type>%s</type>\n", indent,
1373 type);
1374 if (mp->type == MD_VNODE && mp->vnode != NULL)
1375 sbuf_printf(sb, "%s<file>%s</file>\n",
1376 indent, mp->file);
1377 }
1378 }
1379}
1380
1381static void
1382g_md_fini(struct g_class *mp __unused)
1383{
1384
1385 sx_destroy(&md_sx);
1386 if (status_dev != NULL)
1387 destroy_dev(status_dev);
1388 delete_unrhdr(md_uh);
1389}