1 /*-
2 * SPDX-License-Identifier: (Beerware AND BSD-3-Clause)
3 *
4 * ----------------------------------------------------------------------------
5 * "THE BEER-WARE LICENSE" (Revision 42):
6 * <[email protected]> wrote this file. As long as you retain this notice you
7 * can do whatever you want with this stuff. If we meet some day, and you think
8 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
9 * ----------------------------------------------------------------------------
10 *
11 */
12
13 /*-
14 * The following functions are based on 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 * Copyright (c) 2013 The FreeBSD Foundation
22 * All rights reserved.
23 *
24 * This code is derived from software contributed to Berkeley by
25 * the Systems Programming Group of the University of Utah Computer
26 * Science Department.
27 *
28 * Portions of this software were developed by Konstantin Belousov
29 * under sponsorship from the FreeBSD Foundation.
30 *
31 * Redistribution and use in source and binary forms, with or without
32 * modification, are permitted provided that the following conditions
33 * are met:
34 * 1. Redistributions of source code must retain the above copyright
35 * notice, this list of conditions and the following disclaimer.
36 * 2. Redistributions in binary form must reproduce the above copyright
37 * notice, this list of conditions and the following disclaimer in the
38 * documentation and/or other materials provided with the distribution.
39 * 3. Neither the name of the University nor the names of its contributors
40 * may be used to endorse or promote products derived from this software
41 * without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 *
55 * from: Utah Hdr: vn.c 1.13 94/04/02
56 *
57 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94
58 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03
59 */
60
61 #include "opt_rootdevname.h"
62 #include "opt_geom.h"
63 #include "opt_md.h"
64
65 #include <sys/param.h>
66 #include <sys/systm.h>
67 #include <sys/bio.h>
68 #include <sys/buf.h>
69 #include <sys/conf.h>
70 #include <sys/devicestat.h>
71 #include <sys/fcntl.h>
72 #include <sys/kernel.h>
73 #include <sys/kthread.h>
74 #include <sys/limits.h>
75 #include <sys/linker.h>
76 #include <sys/lock.h>
77 #include <sys/malloc.h>
78 #include <sys/mdioctl.h>
79 #include <sys/mount.h>
80 #include <sys/mutex.h>
81 #include <sys/sx.h>
82 #include <sys/namei.h>
83 #include <sys/proc.h>
84 #include <sys/queue.h>
85 #include <sys/rwlock.h>
86 #include <sys/sbuf.h>
87 #include <sys/sched.h>
88 #include <sys/sf_buf.h>
89 #include <sys/sysctl.h>
90 #include <sys/uio.h>
91 #include <sys/unistd.h>
92 #include <sys/vnode.h>
93 #include <sys/disk.h>
94
95 #include <geom/geom.h>
96 #include <geom/geom_int.h>
97
98 #include <vm/vm.h>
99 #include <vm/vm_extern.h>
100 #include <vm/vm_param.h>
101 #include <vm/vm_object.h>
102 #include <vm/vm_page.h>
103 #include <vm/vm_pager.h>
104 #include <vm/swap_pager.h>
105 #include <vm/uma.h>
106
107 #include <machine/bus.h>
108
109 #define MD_MODVER 1
110
111 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */
112 #define MD_EXITING 0x20000 /* Worker thread is exiting. */
113 #define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */
114
115 #ifndef MD_NSECT
116 #define MD_NSECT (10000 * 2)
117 #endif
118
119 struct md_req {
120 unsigned md_unit; /* unit number */
121 enum md_types md_type; /* type of disk */
122 off_t md_mediasize; /* size of disk in bytes */
123 unsigned md_sectorsize; /* sectorsize */
124 unsigned md_options; /* options */
125 int md_fwheads; /* firmware heads */
126 int md_fwsectors; /* firmware sectors */
127 char *md_file; /* pathname of file to mount */
128 enum uio_seg md_file_seg; /* location of md_file */
129 char *md_label; /* label of the device (userspace) */
130 int *md_units; /* pointer to units array (kernel) */
131 size_t md_units_nitems; /* items in md_units array */
132 };
133
134 #ifdef COMPAT_FREEBSD32
135 struct md_ioctl32 {
136 unsigned md_version;
137 unsigned md_unit;
138 enum md_types md_type;
139 uint32_t md_file;
140 off_t md_mediasize;
141 unsigned md_sectorsize;
142 unsigned md_options;
143 uint64_t md_base;
144 int md_fwheads;
145 int md_fwsectors;
146 uint32_t md_label;
147 int md_pad[MDNPAD];
148 }
149 #ifdef __amd64__
150 __attribute__((__packed__))
151 #endif
152 ;
153 #ifndef __amd64__
154 CTASSERT((sizeof(struct md_ioctl32)) == 440);
155 #else
156 CTASSERT((sizeof(struct md_ioctl32)) == 436);
157 #endif
158
159 #define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32)
160 #define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32)
161 #define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32)
162 #define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32)
163 #endif /* COMPAT_FREEBSD32 */
164
165 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk");
166 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors");
167
168 static int md_debug;
169 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0,
170 "Enable md(4) debug messages");
171 static int md_malloc_wait;
172 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0,
173 "Allow malloc to wait for memory allocations");
174
175 #if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE)
176 #define MD_ROOT_FSTYPE "ufs"
177 #endif
178
179 #if defined(MD_ROOT)
180 /*
181 * Preloaded image gets put here.
182 */
183 #if defined(MD_ROOT_SIZE)
184 /*
185 * We put the mfs_root symbol into the oldmfs section of the kernel object file.
186 * Applications that patch the object with the image can determine
187 * the size looking at the oldmfs section size within the kernel.
188 */
189 u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs")));
190 const int mfs_root_size = sizeof(mfs_root);
191 #elif defined(MD_ROOT_MEM)
192 /* MD region already mapped in the memory */
193 u_char *mfs_root;
194 int mfs_root_size;
195 #else
196 extern volatile u_char __weak_symbol mfs_root;
197 extern volatile u_char __weak_symbol mfs_root_end;
198 #define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root))
199 #endif
200 #endif
201
202 static g_init_t g_md_init;
203 static g_fini_t g_md_fini;
204 static g_start_t g_md_start;
205 static g_access_t g_md_access;
206 static void g_md_dumpconf(struct sbuf *sb, const char *indent,
207 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp);
208 static g_provgone_t g_md_providergone;
209
210 static struct cdev *status_dev = NULL;
211 static struct sx md_sx;
212 static struct unrhdr *md_uh;
213
214 static d_ioctl_t mdctlioctl;
215
216 static struct cdevsw mdctl_cdevsw = {
217 .d_version = D_VERSION,
218 .d_ioctl = mdctlioctl,
219 .d_name = MD_NAME,
220 };
221
222 struct g_class g_md_class = {
223 .name = "MD",
224 .version = G_VERSION,
225 .init = g_md_init,
226 .fini = g_md_fini,
227 .start = g_md_start,
228 .access = g_md_access,
229 .dumpconf = g_md_dumpconf,
230 .providergone = g_md_providergone,
231 };
232
233 DECLARE_GEOM_CLASS(g_md_class, g_md);
234 MODULE_VERSION(geom_md, 0);
235
236 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list);
237
238 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t))
239 #define NMASK (NINDIR-1)
240 static int nshift;
241
242 struct indir {
243 uintptr_t *array;
244 u_int total;
245 u_int used;
246 u_int shift;
247 };
248
249 struct md_s {
250 int unit;
251 LIST_ENTRY(md_s) list;
252 struct bio_queue_head bio_queue;
253 struct mtx queue_mtx;
254 struct cdev *dev;
255 enum md_types type;
256 off_t mediasize;
257 unsigned sectorsize;
258 unsigned opencount;
259 unsigned fwheads;
260 unsigned fwsectors;
261 char ident[32];
262 unsigned flags;
263 char name[20];
264 struct proc *procp;
265 struct g_geom *gp;
266 struct g_provider *pp;
267 int (*start)(struct md_s *sc, struct bio *bp);
268 struct devstat *devstat;
269 bool candelete;
270
271 /* MD_MALLOC related fields */
272 struct indir *indir;
273 uma_zone_t uma;
274
275 /* MD_PRELOAD related fields */
276 u_char *pl_ptr;
277 size_t pl_len;
278
279 /* MD_VNODE related fields */
280 struct vnode *vnode;
281 char file[PATH_MAX];
282 char label[PATH_MAX];
283 struct ucred *cred;
284 vm_offset_t kva;
285
286 /* MD_SWAP related fields */
287 vm_object_t object;
288 };
289
290 static struct indir *
new_indir(u_int shift)291 new_indir(u_int shift)
292 {
293 struct indir *ip;
294
295 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT)
296 | M_ZERO);
297 if (ip == NULL)
298 return (NULL);
299 ip->array = malloc(sizeof(uintptr_t) * NINDIR,
300 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO);
301 if (ip->array == NULL) {
302 free(ip, M_MD);
303 return (NULL);
304 }
305 ip->total = NINDIR;
306 ip->shift = shift;
307 return (ip);
308 }
309
310 static void
del_indir(struct indir * ip)311 del_indir(struct indir *ip)
312 {
313
314 free(ip->array, M_MDSECT);
315 free(ip, M_MD);
316 }
317
318 static void
destroy_indir(struct md_s * sc,struct indir * ip)319 destroy_indir(struct md_s *sc, struct indir *ip)
320 {
321 int i;
322
323 for (i = 0; i < NINDIR; i++) {
324 if (!ip->array[i])
325 continue;
326 if (ip->shift)
327 destroy_indir(sc, (struct indir*)(ip->array[i]));
328 else if (ip->array[i] > 255)
329 uma_zfree(sc->uma, (void *)(ip->array[i]));
330 }
331 del_indir(ip);
332 }
333
334 /*
335 * This function does the math and allocates the top level "indir" structure
336 * for a device of "size" sectors.
337 */
338
339 static struct indir *
dimension(off_t size)340 dimension(off_t size)
341 {
342 off_t rcnt;
343 struct indir *ip;
344 int layer;
345
346 rcnt = size;
347 layer = 0;
348 while (rcnt > NINDIR) {
349 rcnt /= NINDIR;
350 layer++;
351 }
352
353 /*
354 * XXX: the top layer is probably not fully populated, so we allocate
355 * too much space for ip->array in here.
356 */
357 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO);
358 ip->array = malloc(sizeof(uintptr_t) * NINDIR,
359 M_MDSECT, M_WAITOK | M_ZERO);
360 ip->total = NINDIR;
361 ip->shift = layer * nshift;
362 return (ip);
363 }
364
365 /*
366 * Read a given sector
367 */
368
369 static uintptr_t
s_read(struct indir * ip,off_t offset)370 s_read(struct indir *ip, off_t offset)
371 {
372 struct indir *cip;
373 int idx;
374 uintptr_t up;
375
376 if (md_debug > 1)
377 printf("s_read(%jd)\n", (intmax_t)offset);
378 up = 0;
379 for (cip = ip; cip != NULL;) {
380 if (cip->shift) {
381 idx = (offset >> cip->shift) & NMASK;
382 up = cip->array[idx];
383 cip = (struct indir *)up;
384 continue;
385 }
386 idx = offset & NMASK;
387 return (cip->array[idx]);
388 }
389 return (0);
390 }
391
392 /*
393 * Write a given sector, prune the tree if the value is 0
394 */
395
396 static int
s_write(struct indir * ip,off_t offset,uintptr_t ptr)397 s_write(struct indir *ip, off_t offset, uintptr_t ptr)
398 {
399 struct indir *cip, *lip[10];
400 int idx, li;
401 uintptr_t up;
402
403 if (md_debug > 1)
404 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr);
405 up = 0;
406 li = 0;
407 cip = ip;
408 for (;;) {
409 lip[li++] = cip;
410 if (cip->shift) {
411 idx = (offset >> cip->shift) & NMASK;
412 up = cip->array[idx];
413 if (up != 0) {
414 cip = (struct indir *)up;
415 continue;
416 }
417 /* Allocate branch */
418 cip->array[idx] =
419 (uintptr_t)new_indir(cip->shift - nshift);
420 if (cip->array[idx] == 0)
421 return (ENOSPC);
422 cip->used++;
423 up = cip->array[idx];
424 cip = (struct indir *)up;
425 continue;
426 }
427 /* leafnode */
428 idx = offset & NMASK;
429 up = cip->array[idx];
430 if (up != 0)
431 cip->used--;
432 cip->array[idx] = ptr;
433 if (ptr != 0)
434 cip->used++;
435 break;
436 }
437 if (cip->used != 0 || li == 1)
438 return (0);
439 li--;
440 while (cip->used == 0 && cip != ip) {
441 li--;
442 idx = (offset >> lip[li]->shift) & NMASK;
443 up = lip[li]->array[idx];
444 KASSERT(up == (uintptr_t)cip, ("md screwed up"));
445 del_indir(cip);
446 lip[li]->array[idx] = 0;
447 lip[li]->used--;
448 cip = lip[li];
449 }
450 return (0);
451 }
452
453 static int
g_md_access(struct g_provider * pp,int r,int w,int e)454 g_md_access(struct g_provider *pp, int r, int w, int e)
455 {
456 struct md_s *sc;
457
458 sc = pp->geom->softc;
459 if (sc == NULL) {
460 if (r <= 0 && w <= 0 && e <= 0)
461 return (0);
462 return (ENXIO);
463 }
464 r += pp->acr;
465 w += pp->acw;
466 e += pp->ace;
467 if ((sc->flags & MD_READONLY) != 0 && w > 0)
468 return (EROFS);
469 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
470 sc->opencount = 1;
471 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
472 sc->opencount = 0;
473 }
474 return (0);
475 }
476
477 static void
g_md_start(struct bio * bp)478 g_md_start(struct bio *bp)
479 {
480 struct md_s *sc;
481
482 sc = bp->bio_to->geom->softc;
483 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) {
484 devstat_start_transaction_bio(sc->devstat, bp);
485 }
486 mtx_lock(&sc->queue_mtx);
487 bioq_disksort(&sc->bio_queue, bp);
488 wakeup(sc);
489 mtx_unlock(&sc->queue_mtx);
490 }
491
492 #define MD_MALLOC_MOVE_ZERO 1
493 #define MD_MALLOC_MOVE_FILL 2
494 #define MD_MALLOC_MOVE_READ 3
495 #define MD_MALLOC_MOVE_WRITE 4
496 #define MD_MALLOC_MOVE_CMP 5
497
498 static int
md_malloc_move_ma(vm_page_t ** mp,int * ma_offs,unsigned sectorsize,void * ptr,u_char fill,int op)499 md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize,
500 void *ptr, u_char fill, int op)
501 {
502 struct sf_buf *sf;
503 vm_page_t m, *mp1;
504 char *p, first;
505 off_t *uc;
506 unsigned n;
507 int error, i, ma_offs1, sz, first_read;
508
509 m = NULL;
510 error = 0;
511 sf = NULL;
512 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */
513 first = 0;
514 first_read = 0;
515 uc = ptr;
516 mp1 = *mp;
517 ma_offs1 = *ma_offs;
518 /* } */
519 sched_pin();
520 for (n = sectorsize; n != 0; n -= sz) {
521 sz = imin(PAGE_SIZE - *ma_offs, n);
522 if (m != **mp) {
523 if (sf != NULL)
524 sf_buf_free(sf);
525 m = **mp;
526 sf = sf_buf_alloc(m, SFB_CPUPRIVATE |
527 (md_malloc_wait ? 0 : SFB_NOWAIT));
528 if (sf == NULL) {
529 error = ENOMEM;
530 break;
531 }
532 }
533 p = (char *)sf_buf_kva(sf) + *ma_offs;
534 switch (op) {
535 case MD_MALLOC_MOVE_ZERO:
536 bzero(p, sz);
537 break;
538 case MD_MALLOC_MOVE_FILL:
539 memset(p, fill, sz);
540 break;
541 case MD_MALLOC_MOVE_READ:
542 bcopy(ptr, p, sz);
543 cpu_flush_dcache(p, sz);
544 break;
545 case MD_MALLOC_MOVE_WRITE:
546 bcopy(p, ptr, sz);
547 break;
548 case MD_MALLOC_MOVE_CMP:
549 for (i = 0; i < sz; i++, p++) {
550 if (!first_read) {
551 *uc = (u_char)*p;
552 first = *p;
553 first_read = 1;
554 } else if (*p != first) {
555 error = EDOOFUS;
556 break;
557 }
558 }
559 break;
560 default:
561 KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op));
562 break;
563 }
564 if (error != 0)
565 break;
566 *ma_offs += sz;
567 *ma_offs %= PAGE_SIZE;
568 if (*ma_offs == 0)
569 (*mp)++;
570 ptr = (char *)ptr + sz;
571 }
572
573 if (sf != NULL)
574 sf_buf_free(sf);
575 sched_unpin();
576 if (op == MD_MALLOC_MOVE_CMP && error != 0) {
577 *mp = mp1;
578 *ma_offs = ma_offs1;
579 }
580 return (error);
581 }
582
583 static int
md_malloc_move_vlist(bus_dma_segment_t ** pvlist,int * pma_offs,unsigned len,void * ptr,u_char fill,int op)584 md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs,
585 unsigned len, void *ptr, u_char fill, int op)
586 {
587 bus_dma_segment_t *vlist;
588 uint8_t *p, *end, first;
589 off_t *uc;
590 int ma_offs, seg_len;
591
592 vlist = *pvlist;
593 ma_offs = *pma_offs;
594 uc = ptr;
595
596 for (; len != 0; len -= seg_len) {
597 seg_len = imin(vlist->ds_len - ma_offs, len);
598 p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs;
599 switch (op) {
600 case MD_MALLOC_MOVE_ZERO:
601 bzero(p, seg_len);
602 break;
603 case MD_MALLOC_MOVE_FILL:
604 memset(p, fill, seg_len);
605 break;
606 case MD_MALLOC_MOVE_READ:
607 bcopy(ptr, p, seg_len);
608 cpu_flush_dcache(p, seg_len);
609 break;
610 case MD_MALLOC_MOVE_WRITE:
611 bcopy(p, ptr, seg_len);
612 break;
613 case MD_MALLOC_MOVE_CMP:
614 end = p + seg_len;
615 first = *uc = *p;
616 /* Confirm all following bytes match the first */
617 while (++p < end) {
618 if (*p != first)
619 return (EDOOFUS);
620 }
621 break;
622 default:
623 KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op));
624 break;
625 }
626
627 ma_offs += seg_len;
628 if (ma_offs == vlist->ds_len) {
629 ma_offs = 0;
630 vlist++;
631 }
632 ptr = (uint8_t *)ptr + seg_len;
633 }
634 *pvlist = vlist;
635 *pma_offs = ma_offs;
636
637 return (0);
638 }
639
640 static int
mdstart_malloc(struct md_s * sc,struct bio * bp)641 mdstart_malloc(struct md_s *sc, struct bio *bp)
642 {
643 u_char *dst;
644 vm_page_t *m;
645 bus_dma_segment_t *vlist;
646 int i, error, error1, ma_offs, notmapped;
647 off_t secno, nsec, uc;
648 uintptr_t sp, osp;
649
650 switch (bp->bio_cmd) {
651 case BIO_READ:
652 case BIO_WRITE:
653 case BIO_DELETE:
654 break;
655 case BIO_FLUSH:
656 return (0);
657 default:
658 return (EOPNOTSUPP);
659 }
660
661 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0;
662 vlist = (bp->bio_flags & BIO_VLIST) != 0 ?
663 (bus_dma_segment_t *)bp->bio_data : NULL;
664 if (notmapped) {
665 m = bp->bio_ma;
666 ma_offs = bp->bio_ma_offset;
667 dst = NULL;
668 KASSERT(vlist == NULL, ("vlists cannot be unmapped"));
669 } else if (vlist != NULL) {
670 ma_offs = bp->bio_ma_offset;
671 dst = NULL;
672 } else {
673 dst = bp->bio_data;
674 }
675
676 nsec = bp->bio_length / sc->sectorsize;
677 secno = bp->bio_offset / sc->sectorsize;
678 error = 0;
679 while (nsec--) {
680 osp = s_read(sc->indir, secno);
681 if (bp->bio_cmd == BIO_DELETE) {
682 if (osp != 0)
683 error = s_write(sc->indir, secno, 0);
684 } else if (bp->bio_cmd == BIO_READ) {
685 if (osp == 0) {
686 if (notmapped) {
687 error = md_malloc_move_ma(&m, &ma_offs,
688 sc->sectorsize, NULL, 0,
689 MD_MALLOC_MOVE_ZERO);
690 } else if (vlist != NULL) {
691 error = md_malloc_move_vlist(&vlist,
692 &ma_offs, sc->sectorsize, NULL, 0,
693 MD_MALLOC_MOVE_ZERO);
694 } else
695 bzero(dst, sc->sectorsize);
696 } else if (osp <= 255) {
697 if (notmapped) {
698 error = md_malloc_move_ma(&m, &ma_offs,
699 sc->sectorsize, NULL, osp,
700 MD_MALLOC_MOVE_FILL);
701 } else if (vlist != NULL) {
702 error = md_malloc_move_vlist(&vlist,
703 &ma_offs, sc->sectorsize, NULL, osp,
704 MD_MALLOC_MOVE_FILL);
705 } else
706 memset(dst, osp, sc->sectorsize);
707 } else {
708 if (notmapped) {
709 error = md_malloc_move_ma(&m, &ma_offs,
710 sc->sectorsize, (void *)osp, 0,
711 MD_MALLOC_MOVE_READ);
712 } else if (vlist != NULL) {
713 error = md_malloc_move_vlist(&vlist,
714 &ma_offs, sc->sectorsize,
715 (void *)osp, 0,
716 MD_MALLOC_MOVE_READ);
717 } else {
718 bcopy((void *)osp, dst, sc->sectorsize);
719 cpu_flush_dcache(dst, sc->sectorsize);
720 }
721 }
722 osp = 0;
723 } else if (bp->bio_cmd == BIO_WRITE) {
724 if (sc->flags & MD_COMPRESS) {
725 if (notmapped) {
726 error1 = md_malloc_move_ma(&m, &ma_offs,
727 sc->sectorsize, &uc, 0,
728 MD_MALLOC_MOVE_CMP);
729 i = error1 == 0 ? sc->sectorsize : 0;
730 } else if (vlist != NULL) {
731 error1 = md_malloc_move_vlist(&vlist,
732 &ma_offs, sc->sectorsize, &uc, 0,
733 MD_MALLOC_MOVE_CMP);
734 i = error1 == 0 ? sc->sectorsize : 0;
735 } else {
736 uc = dst[0];
737 for (i = 1; i < sc->sectorsize; i++) {
738 if (dst[i] != uc)
739 break;
740 }
741 }
742 } else {
743 i = 0;
744 uc = 0;
745 }
746 if (i == sc->sectorsize) {
747 if (osp != uc)
748 error = s_write(sc->indir, secno, uc);
749 } else {
750 if (osp <= 255) {
751 sp = (uintptr_t)uma_zalloc(sc->uma,
752 md_malloc_wait ? M_WAITOK :
753 M_NOWAIT);
754 if (sp == 0) {
755 error = ENOSPC;
756 break;
757 }
758 if (notmapped) {
759 error = md_malloc_move_ma(&m,
760 &ma_offs, sc->sectorsize,
761 (void *)sp, 0,
762 MD_MALLOC_MOVE_WRITE);
763 } else if (vlist != NULL) {
764 error = md_malloc_move_vlist(
765 &vlist, &ma_offs,
766 sc->sectorsize, (void *)sp,
767 0, MD_MALLOC_MOVE_WRITE);
768 } else {
769 bcopy(dst, (void *)sp,
770 sc->sectorsize);
771 }
772 error = s_write(sc->indir, secno, sp);
773 } else {
774 if (notmapped) {
775 error = md_malloc_move_ma(&m,
776 &ma_offs, sc->sectorsize,
777 (void *)osp, 0,
778 MD_MALLOC_MOVE_WRITE);
779 } else if (vlist != NULL) {
780 error = md_malloc_move_vlist(
781 &vlist, &ma_offs,
782 sc->sectorsize, (void *)osp,
783 0, MD_MALLOC_MOVE_WRITE);
784 } else {
785 bcopy(dst, (void *)osp,
786 sc->sectorsize);
787 }
788 osp = 0;
789 }
790 }
791 } else {
792 error = EOPNOTSUPP;
793 }
794 if (osp > 255)
795 uma_zfree(sc->uma, (void*)osp);
796 if (error != 0)
797 break;
798 secno++;
799 if (!notmapped && vlist == NULL)
800 dst += sc->sectorsize;
801 }
802 bp->bio_resid = 0;
803 return (error);
804 }
805
806 static void
mdcopyto_vlist(void * src,bus_dma_segment_t * vlist,off_t offset,off_t len)807 mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len)
808 {
809 off_t seg_len;
810
811 while (offset >= vlist->ds_len) {
812 offset -= vlist->ds_len;
813 vlist++;
814 }
815
816 while (len != 0) {
817 seg_len = omin(len, vlist->ds_len - offset);
818 bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset),
819 seg_len);
820 offset = 0;
821 src = (uint8_t *)src + seg_len;
822 len -= seg_len;
823 vlist++;
824 }
825 }
826
827 static void
mdcopyfrom_vlist(bus_dma_segment_t * vlist,off_t offset,void * dst,off_t len)828 mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len)
829 {
830 off_t seg_len;
831
832 while (offset >= vlist->ds_len) {
833 offset -= vlist->ds_len;
834 vlist++;
835 }
836
837 while (len != 0) {
838 seg_len = omin(len, vlist->ds_len - offset);
839 bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst,
840 seg_len);
841 offset = 0;
842 dst = (uint8_t *)dst + seg_len;
843 len -= seg_len;
844 vlist++;
845 }
846 }
847
848 static int
mdstart_preload(struct md_s * sc,struct bio * bp)849 mdstart_preload(struct md_s *sc, struct bio *bp)
850 {
851 uint8_t *p;
852
853 p = sc->pl_ptr + bp->bio_offset;
854 switch (bp->bio_cmd) {
855 case BIO_READ:
856 if ((bp->bio_flags & BIO_VLIST) != 0) {
857 mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data,
858 bp->bio_ma_offset, bp->bio_length);
859 } else {
860 bcopy(p, bp->bio_data, bp->bio_length);
861 }
862 cpu_flush_dcache(bp->bio_data, bp->bio_length);
863 break;
864 case BIO_WRITE:
865 if ((bp->bio_flags & BIO_VLIST) != 0) {
866 mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data,
867 bp->bio_ma_offset, p, bp->bio_length);
868 } else {
869 bcopy(bp->bio_data, p, bp->bio_length);
870 }
871 break;
872 }
873 bp->bio_resid = 0;
874 return (0);
875 }
876
877 static int
mdstart_vnode(struct md_s * sc,struct bio * bp)878 mdstart_vnode(struct md_s *sc, struct bio *bp)
879 {
880 int error;
881 struct uio auio;
882 struct iovec aiov;
883 struct iovec *piov;
884 struct mount *mp;
885 struct vnode *vp;
886 bus_dma_segment_t *vlist;
887 struct thread *td;
888 off_t iolen, iostart, off, len;
889 int ma_offs, npages;
890 bool mapped;
891
892 switch (bp->bio_cmd) {
893 case BIO_READ:
894 auio.uio_rw = UIO_READ;
895 break;
896 case BIO_WRITE:
897 auio.uio_rw = UIO_WRITE;
898 break;
899 case BIO_FLUSH:
900 break;
901 case BIO_DELETE:
902 if (sc->candelete)
903 break;
904 /* FALLTHROUGH */
905 default:
906 return (EOPNOTSUPP);
907 }
908
909 td = curthread;
910 vp = sc->vnode;
911 piov = NULL;
912 ma_offs = bp->bio_ma_offset;
913 off = bp->bio_offset;
914 len = bp->bio_length;
915 mapped = false;
916
917 /*
918 * VNODE I/O
919 *
920 * If an error occurs, we set BIO_ERROR but we do not set
921 * B_INVAL because (for a write anyway), the buffer is
922 * still valid.
923 */
924
925 if (bp->bio_cmd == BIO_FLUSH) {
926 do {
927 (void)vn_start_write(vp, &mp, V_WAIT);
928 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
929 error = VOP_FSYNC(vp, MNT_WAIT, td);
930 VOP_UNLOCK(vp);
931 vn_finished_write(mp);
932 } while (error == ERELOOKUP);
933 return (error);
934 } else if (bp->bio_cmd == BIO_DELETE) {
935 error = vn_deallocate(vp, &off, &len, 0,
936 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred, NOCRED);
937 bp->bio_resid = len;
938 return (error);
939 }
940
941 auio.uio_offset = (vm_ooffset_t)bp->bio_offset;
942 auio.uio_resid = bp->bio_length;
943 auio.uio_segflg = UIO_SYSSPACE;
944 auio.uio_td = td;
945
946 if ((bp->bio_flags & BIO_VLIST) != 0) {
947 piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK);
948 auio.uio_iov = piov;
949 vlist = (bus_dma_segment_t *)bp->bio_data;
950 while (len > 0) {
951 piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr +
952 ma_offs);
953 piov->iov_len = vlist->ds_len - ma_offs;
954 if (piov->iov_len > len)
955 piov->iov_len = len;
956 len -= piov->iov_len;
957 ma_offs = 0;
958 vlist++;
959 piov++;
960 }
961 auio.uio_iovcnt = piov - auio.uio_iov;
962 piov = auio.uio_iov;
963 } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
964 bp->bio_resid = len;
965 unmapped_step:
966 npages = atop(min(maxphys, round_page(len + (ma_offs &
967 PAGE_MASK))));
968 iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len);
969 KASSERT(iolen > 0, ("zero iolen"));
970 KASSERT(npages <= atop(MAXPHYS + PAGE_SIZE),
971 ("npages %d too large", npages));
972 pmap_qenter(sc->kva, &bp->bio_ma[atop(ma_offs)], npages);
973 aiov.iov_base = (void *)(sc->kva + (ma_offs & PAGE_MASK));
974 aiov.iov_len = iolen;
975 auio.uio_iov = &aiov;
976 auio.uio_iovcnt = 1;
977 auio.uio_resid = iolen;
978 mapped = true;
979 } else {
980 aiov.iov_base = bp->bio_data;
981 aiov.iov_len = bp->bio_length;
982 auio.uio_iov = &aiov;
983 auio.uio_iovcnt = 1;
984 }
985 iostart = auio.uio_offset;
986 if (auio.uio_rw == UIO_READ) {
987 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
988 error = VOP_READ(vp, &auio, 0, sc->cred);
989 VOP_UNLOCK(vp);
990 } else {
991 (void) vn_start_write(vp, &mp, V_WAIT);
992 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
993 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC,
994 sc->cred);
995 VOP_UNLOCK(vp);
996 vn_finished_write(mp);
997 if (error == 0)
998 sc->flags &= ~MD_VERIFY;
999 }
1000
1001 /* When MD_CACHE is set, try to avoid double-caching the data. */
1002 if (error == 0 && (sc->flags & MD_CACHE) == 0)
1003 VOP_ADVISE(vp, iostart, auio.uio_offset - 1,
1004 POSIX_FADV_DONTNEED);
1005
1006 if (mapped) {
1007 pmap_qremove(sc->kva, npages);
1008 if (error == 0) {
1009 len -= iolen;
1010 bp->bio_resid -= iolen;
1011 ma_offs += iolen;
1012 if (len > 0)
1013 goto unmapped_step;
1014 }
1015 } else {
1016 bp->bio_resid = auio.uio_resid;
1017 }
1018
1019 free(piov, M_MD);
1020 return (error);
1021 }
1022
1023 static int
mdstart_swap(struct md_s * sc,struct bio * bp)1024 mdstart_swap(struct md_s *sc, struct bio *bp)
1025 {
1026 vm_page_t m;
1027 u_char *p;
1028 vm_pindex_t i, lastp;
1029 bus_dma_segment_t *vlist;
1030 int rv, ma_offs, offs, len, lastend;
1031
1032 switch (bp->bio_cmd) {
1033 case BIO_READ:
1034 case BIO_WRITE:
1035 case BIO_DELETE:
1036 break;
1037 case BIO_FLUSH:
1038 return (0);
1039 default:
1040 return (EOPNOTSUPP);
1041 }
1042
1043 p = bp->bio_data;
1044 ma_offs = (bp->bio_flags & (BIO_UNMAPPED|BIO_VLIST)) != 0 ?
1045 bp->bio_ma_offset : 0;
1046 vlist = (bp->bio_flags & BIO_VLIST) != 0 ?
1047 (bus_dma_segment_t *)bp->bio_data : NULL;
1048
1049 /*
1050 * offs is the offset at which to start operating on the
1051 * next (ie, first) page. lastp is the last page on
1052 * which we're going to operate. lastend is the ending
1053 * position within that last page (ie, PAGE_SIZE if
1054 * we're operating on complete aligned pages).
1055 */
1056 offs = bp->bio_offset % PAGE_SIZE;
1057 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE;
1058 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1;
1059
1060 rv = VM_PAGER_OK;
1061 vm_object_pip_add(sc->object, 1);
1062 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) {
1063 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs;
1064 m = vm_page_grab_unlocked(sc->object, i, VM_ALLOC_SYSTEM);
1065 if (bp->bio_cmd == BIO_READ) {
1066 if (vm_page_all_valid(m))
1067 rv = VM_PAGER_OK;
1068 else
1069 rv = vm_pager_get_pages(sc->object, &m, 1,
1070 NULL, NULL);
1071 if (rv == VM_PAGER_ERROR) {
1072 VM_OBJECT_WLOCK(sc->object);
1073 vm_page_free(m);
1074 VM_OBJECT_WUNLOCK(sc->object);
1075 break;
1076 } else if (rv == VM_PAGER_FAIL) {
1077 /*
1078 * Pager does not have the page. Zero
1079 * the allocated page, and mark it as
1080 * valid. Do not set dirty, the page
1081 * can be recreated if thrown out.
1082 */
1083 pmap_zero_page(m);
1084 vm_page_valid(m);
1085 }
1086 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
1087 pmap_copy_pages(&m, offs, bp->bio_ma,
1088 ma_offs, len);
1089 } else if ((bp->bio_flags & BIO_VLIST) != 0) {
1090 physcopyout_vlist(VM_PAGE_TO_PHYS(m) + offs,
1091 vlist, ma_offs, len);
1092 cpu_flush_dcache(p, len);
1093 } else {
1094 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len);
1095 cpu_flush_dcache(p, len);
1096 }
1097 } else if (bp->bio_cmd == BIO_WRITE) {
1098 if (len == PAGE_SIZE || vm_page_all_valid(m))
1099 rv = VM_PAGER_OK;
1100 else
1101 rv = vm_pager_get_pages(sc->object, &m, 1,
1102 NULL, NULL);
1103 if (rv == VM_PAGER_ERROR) {
1104 VM_OBJECT_WLOCK(sc->object);
1105 vm_page_free(m);
1106 VM_OBJECT_WUNLOCK(sc->object);
1107 break;
1108 } else if (rv == VM_PAGER_FAIL)
1109 pmap_zero_page(m);
1110
1111 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
1112 pmap_copy_pages(bp->bio_ma, ma_offs, &m,
1113 offs, len);
1114 } else if ((bp->bio_flags & BIO_VLIST) != 0) {
1115 physcopyin_vlist(vlist, ma_offs,
1116 VM_PAGE_TO_PHYS(m) + offs, len);
1117 } else {
1118 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len);
1119 }
1120
1121 vm_page_valid(m);
1122 vm_page_set_dirty(m);
1123 } else if (bp->bio_cmd == BIO_DELETE) {
1124 if (len == PAGE_SIZE || vm_page_all_valid(m))
1125 rv = VM_PAGER_OK;
1126 else
1127 rv = vm_pager_get_pages(sc->object, &m, 1,
1128 NULL, NULL);
1129 VM_OBJECT_WLOCK(sc->object);
1130 if (rv == VM_PAGER_ERROR) {
1131 vm_page_free(m);
1132 VM_OBJECT_WUNLOCK(sc->object);
1133 break;
1134 } else if (rv == VM_PAGER_FAIL) {
1135 vm_page_free(m);
1136 m = NULL;
1137 } else {
1138 /* Page is valid. */
1139 if (len != PAGE_SIZE) {
1140 pmap_zero_page_area(m, offs, len);
1141 vm_page_set_dirty(m);
1142 } else {
1143 vm_pager_page_unswapped(m);
1144 vm_page_free(m);
1145 m = NULL;
1146 }
1147 }
1148 VM_OBJECT_WUNLOCK(sc->object);
1149 }
1150 if (m != NULL) {
1151 /*
1152 * The page may be deactivated prior to setting
1153 * PGA_REFERENCED, but in this case it will be
1154 * reactivated by the page daemon.
1155 */
1156 if (vm_page_active(m))
1157 vm_page_reference(m);
1158 else
1159 vm_page_activate(m);
1160 vm_page_xunbusy(m);
1161 }
1162
1163 /* Actions on further pages start at offset 0 */
1164 p += PAGE_SIZE - offs;
1165 offs = 0;
1166 ma_offs += len;
1167 }
1168 vm_object_pip_wakeup(sc->object);
1169 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC);
1170 }
1171
1172 static int
mdstart_null(struct md_s * sc,struct bio * bp)1173 mdstart_null(struct md_s *sc, struct bio *bp)
1174 {
1175
1176 switch (bp->bio_cmd) {
1177 case BIO_READ:
1178 bzero(bp->bio_data, bp->bio_length);
1179 cpu_flush_dcache(bp->bio_data, bp->bio_length);
1180 break;
1181 case BIO_WRITE:
1182 break;
1183 }
1184 bp->bio_resid = 0;
1185 return (0);
1186 }
1187
1188 static void
md_handleattr(struct md_s * sc,struct bio * bp)1189 md_handleattr(struct md_s *sc, struct bio *bp)
1190 {
1191 if (sc->fwsectors && sc->fwheads &&
1192 (g_handleattr_int(bp, "GEOM::fwsectors", sc->fwsectors) != 0 ||
1193 g_handleattr_int(bp, "GEOM::fwheads", sc->fwheads) != 0))
1194 return;
1195 if (g_handleattr_int(bp, "GEOM::candelete", sc->candelete) != 0)
1196 return;
1197 if (sc->ident[0] != '\0' &&
1198 g_handleattr_str(bp, "GEOM::ident", sc->ident) != 0)
1199 return;
1200 if (g_handleattr_int(bp, "MNT::verified", (sc->flags & MD_VERIFY) != 0))
1201 return;
1202 g_io_deliver(bp, EOPNOTSUPP);
1203 }
1204
1205 static void
md_kthread(void * arg)1206 md_kthread(void *arg)
1207 {
1208 struct md_s *sc;
1209 struct bio *bp;
1210 int error;
1211
1212 sc = arg;
1213 thread_lock(curthread);
1214 sched_prio(curthread, PRIBIO);
1215 thread_unlock(curthread);
1216 if (sc->type == MD_VNODE)
1217 curthread->td_pflags |= TDP_NORUNNINGBUF;
1218
1219 for (;;) {
1220 mtx_lock(&sc->queue_mtx);
1221 if (sc->flags & MD_SHUTDOWN) {
1222 sc->flags |= MD_EXITING;
1223 mtx_unlock(&sc->queue_mtx);
1224 kproc_exit(0);
1225 }
1226 bp = bioq_takefirst(&sc->bio_queue);
1227 if (!bp) {
1228 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0);
1229 continue;
1230 }
1231 mtx_unlock(&sc->queue_mtx);
1232 if (bp->bio_cmd == BIO_GETATTR) {
1233 md_handleattr(sc, bp);
1234 } else {
1235 error = sc->start(sc, bp);
1236 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) {
1237 /*
1238 * Devstat uses (bio_bcount, bio_resid) for
1239 * determining the length of the completed part
1240 * of the i/o. g_io_deliver() will translate
1241 * from bio_completed to that, but it also
1242 * destroys the bio so we must do our own
1243 * translation.
1244 */
1245 bp->bio_bcount = bp->bio_length;
1246 devstat_end_transaction_bio(sc->devstat, bp);
1247 }
1248 bp->bio_completed = bp->bio_length - bp->bio_resid;
1249 g_io_deliver(bp, error);
1250 }
1251 }
1252 }
1253
1254 static struct md_s *
mdfind(int unit)1255 mdfind(int unit)
1256 {
1257 struct md_s *sc;
1258
1259 LIST_FOREACH(sc, &md_softc_list, list) {
1260 if (sc->unit == unit)
1261 break;
1262 }
1263 return (sc);
1264 }
1265
1266 static struct md_s *
mdnew(int unit,int * errp,enum md_types type)1267 mdnew(int unit, int *errp, enum md_types type)
1268 {
1269 struct md_s *sc;
1270 int error;
1271
1272 *errp = 0;
1273 if (unit == -1)
1274 unit = alloc_unr(md_uh);
1275 else
1276 unit = alloc_unr_specific(md_uh, unit);
1277
1278 if (unit == -1) {
1279 *errp = EBUSY;
1280 return (NULL);
1281 }
1282
1283 sc = malloc(sizeof(*sc), M_MD, M_WAITOK | M_ZERO);
1284 sc->type = type;
1285 bioq_init(&sc->bio_queue);
1286 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF);
1287 sc->unit = unit;
1288 sprintf(sc->name, "md%d", unit);
1289 LIST_INSERT_HEAD(&md_softc_list, sc, list);
1290 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name);
1291 if (error == 0)
1292 return (sc);
1293 LIST_REMOVE(sc, list);
1294 mtx_destroy(&sc->queue_mtx);
1295 free_unr(md_uh, sc->unit);
1296 free(sc, M_MD);
1297 *errp = error;
1298 return (NULL);
1299 }
1300
1301 static void
mdinit(struct md_s * sc)1302 mdinit(struct md_s *sc)
1303 {
1304 struct g_geom *gp;
1305 struct g_provider *pp;
1306 unsigned remn;
1307
1308 g_topology_lock();
1309 gp = g_new_geomf(&g_md_class, "md%d", sc->unit);
1310 gp->softc = sc;
1311 pp = g_new_providerf(gp, "md%d", sc->unit);
1312 devstat_remove_entry(pp->stat);
1313 pp->stat = NULL;
1314 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
1315 /* Prune off any residual fractional sector. */
1316 remn = sc->mediasize % sc->sectorsize;
1317 if (remn != 0) {
1318 printf("md%d: truncating fractional last sector by %u bytes\n",
1319 sc->unit, remn);
1320 sc->mediasize -= remn;
1321 }
1322 pp->mediasize = sc->mediasize;
1323 pp->sectorsize = sc->sectorsize;
1324 switch (sc->type) {
1325 case MD_MALLOC:
1326 case MD_VNODE:
1327 case MD_SWAP:
1328 pp->flags |= G_PF_ACCEPT_UNMAPPED;
1329 break;
1330 case MD_PRELOAD:
1331 case MD_NULL:
1332 break;
1333 }
1334 sc->gp = gp;
1335 sc->pp = pp;
1336 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize,
1337 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
1338 sc->devstat->id = pp;
1339 g_error_provider(pp, 0);
1340 g_topology_unlock();
1341 }
1342
1343 static int
mdcreate_malloc(struct md_s * sc,struct md_req * mdr)1344 mdcreate_malloc(struct md_s *sc, struct md_req *mdr)
1345 {
1346 uintptr_t sp;
1347 int error;
1348 off_t u;
1349
1350 error = 0;
1351 if (mdr->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE))
1352 return (EINVAL);
1353 if (mdr->md_sectorsize != 0 && !powerof2(mdr->md_sectorsize))
1354 return (EINVAL);
1355 /* Compression doesn't make sense if we have reserved space */
1356 if (mdr->md_options & MD_RESERVE)
1357 mdr->md_options &= ~MD_COMPRESS;
1358 if (mdr->md_fwsectors != 0)
1359 sc->fwsectors = mdr->md_fwsectors;
1360 if (mdr->md_fwheads != 0)
1361 sc->fwheads = mdr->md_fwheads;
1362 sc->flags = mdr->md_options & (MD_COMPRESS | MD_FORCE | MD_RESERVE);
1363 sc->indir = dimension(sc->mediasize / sc->sectorsize);
1364 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL,
1365 0x1ff, 0);
1366 if (mdr->md_options & MD_RESERVE) {
1367 off_t nsectors;
1368
1369 nsectors = sc->mediasize / sc->sectorsize;
1370 for (u = 0; u < nsectors; u++) {
1371 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ?
1372 M_WAITOK : M_NOWAIT) | M_ZERO);
1373 if (sp != 0)
1374 error = s_write(sc->indir, u, sp);
1375 else
1376 error = ENOMEM;
1377 if (error != 0)
1378 break;
1379 }
1380 }
1381 return (error);
1382 }
1383
1384 static int
mdsetcred(struct md_s * sc,struct ucred * cred)1385 mdsetcred(struct md_s *sc, struct ucred *cred)
1386 {
1387 char *tmpbuf;
1388 int error = 0;
1389
1390 /*
1391 * Set credits in our softc
1392 */
1393
1394 if (sc->cred)
1395 crfree(sc->cred);
1396 sc->cred = crhold(cred);
1397
1398 /*
1399 * Horrible kludge to establish credentials for NFS XXX.
1400 */
1401
1402 if (sc->vnode) {
1403 struct uio auio;
1404 struct iovec aiov;
1405
1406 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK);
1407 bzero(&auio, sizeof(auio));
1408
1409 aiov.iov_base = tmpbuf;
1410 aiov.iov_len = sc->sectorsize;
1411 auio.uio_iov = &aiov;
1412 auio.uio_iovcnt = 1;
1413 auio.uio_offset = 0;
1414 auio.uio_rw = UIO_READ;
1415 auio.uio_segflg = UIO_SYSSPACE;
1416 auio.uio_resid = aiov.iov_len;
1417 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY);
1418 error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
1419 VOP_UNLOCK(sc->vnode);
1420 free(tmpbuf, M_TEMP);
1421 }
1422 return (error);
1423 }
1424
1425 static int
mdcreate_vnode(struct md_s * sc,struct md_req * mdr,struct thread * td)1426 mdcreate_vnode(struct md_s *sc, struct md_req *mdr, struct thread *td)
1427 {
1428 struct vattr vattr;
1429 struct nameidata nd;
1430 char *fname;
1431 int error, flags;
1432 long v;
1433
1434 fname = mdr->md_file;
1435 if (mdr->md_file_seg == UIO_USERSPACE) {
1436 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL);
1437 if (error != 0)
1438 return (error);
1439 } else if (mdr->md_file_seg == UIO_SYSSPACE)
1440 strlcpy(sc->file, fname, sizeof(sc->file));
1441 else
1442 return (EDOOFUS);
1443
1444 /*
1445 * If the user specified that this is a read only device, don't
1446 * set the FWRITE mask before trying to open the backing store.
1447 */
1448 flags = FREAD | ((mdr->md_options & MD_READONLY) ? 0 : FWRITE) \
1449 | ((mdr->md_options & MD_VERIFY) ? O_VERIFY : 0);
1450 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, sc->file);
1451 error = vn_open(&nd, &flags, 0, NULL);
1452 if (error != 0)
1453 return (error);
1454 NDFREE_PNBUF(&nd);
1455 if (nd.ni_vp->v_type != VREG) {
1456 error = EINVAL;
1457 goto bad;
1458 }
1459 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred);
1460 if (error != 0)
1461 goto bad;
1462 if ((mdr->md_options & MD_MUSTDEALLOC) != 0) {
1463 error = VOP_PATHCONF(nd.ni_vp, _PC_DEALLOC_PRESENT, &v);
1464 if (error != 0)
1465 goto bad;
1466 if (v == 0)
1467 sc->candelete = false;
1468 }
1469 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) {
1470 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY);
1471 if (VN_IS_DOOMED(nd.ni_vp)) {
1472 /* Forced unmount. */
1473 error = EBADF;
1474 goto bad;
1475 }
1476 }
1477 nd.ni_vp->v_vflag |= VV_MD;
1478 VOP_UNLOCK(nd.ni_vp);
1479
1480 if (mdr->md_fwsectors != 0)
1481 sc->fwsectors = mdr->md_fwsectors;
1482 if (mdr->md_fwheads != 0)
1483 sc->fwheads = mdr->md_fwheads;
1484 snprintf(sc->ident, sizeof(sc->ident), "MD-DEV%ju-INO%ju",
1485 (uintmax_t)vattr.va_fsid, (uintmax_t)vattr.va_fileid);
1486 sc->flags = mdr->md_options & (MD_ASYNC | MD_CACHE | MD_FORCE |
1487 MD_VERIFY | MD_MUSTDEALLOC);
1488 if (!(flags & FWRITE))
1489 sc->flags |= MD_READONLY;
1490 sc->vnode = nd.ni_vp;
1491
1492 error = mdsetcred(sc, td->td_ucred);
1493 if (error != 0) {
1494 sc->vnode = NULL;
1495 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
1496 nd.ni_vp->v_vflag &= ~VV_MD;
1497 goto bad;
1498 }
1499
1500 sc->kva = kva_alloc(MAXPHYS + PAGE_SIZE);
1501 return (0);
1502 bad:
1503 VOP_UNLOCK(nd.ni_vp);
1504 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td);
1505 return (error);
1506 }
1507
1508 static void
g_md_providergone(struct g_provider * pp)1509 g_md_providergone(struct g_provider *pp)
1510 {
1511 struct md_s *sc = pp->geom->softc;
1512
1513 mtx_lock(&sc->queue_mtx);
1514 sc->flags |= MD_PROVIDERGONE;
1515 wakeup(&sc->flags);
1516 mtx_unlock(&sc->queue_mtx);
1517 }
1518
1519 static int
mddestroy(struct md_s * sc,struct thread * td)1520 mddestroy(struct md_s *sc, struct thread *td)
1521 {
1522
1523 if (sc->gp) {
1524 g_topology_lock();
1525 g_wither_geom(sc->gp, ENXIO);
1526 g_topology_unlock();
1527
1528 mtx_lock(&sc->queue_mtx);
1529 while (!(sc->flags & MD_PROVIDERGONE))
1530 msleep(&sc->flags, &sc->queue_mtx, PRIBIO, "mddestroy", 0);
1531 mtx_unlock(&sc->queue_mtx);
1532 }
1533 if (sc->devstat) {
1534 devstat_remove_entry(sc->devstat);
1535 sc->devstat = NULL;
1536 }
1537 mtx_lock(&sc->queue_mtx);
1538 sc->flags |= MD_SHUTDOWN;
1539 wakeup(sc);
1540 while (!(sc->flags & MD_EXITING))
1541 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10);
1542 mtx_unlock(&sc->queue_mtx);
1543 mtx_destroy(&sc->queue_mtx);
1544 if (sc->vnode != NULL) {
1545 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY);
1546 sc->vnode->v_vflag &= ~VV_MD;
1547 VOP_UNLOCK(sc->vnode);
1548 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ?
1549 FREAD : (FREAD|FWRITE), sc->cred, td);
1550 }
1551 if (sc->cred != NULL)
1552 crfree(sc->cred);
1553 if (sc->object != NULL)
1554 vm_object_deallocate(sc->object);
1555 if (sc->indir)
1556 destroy_indir(sc, sc->indir);
1557 if (sc->uma)
1558 uma_zdestroy(sc->uma);
1559 if (sc->kva)
1560 kva_free(sc->kva, MAXPHYS + PAGE_SIZE);
1561
1562 LIST_REMOVE(sc, list);
1563 free_unr(md_uh, sc->unit);
1564 free(sc, M_MD);
1565 return (0);
1566 }
1567
1568 static int
mdresize(struct md_s * sc,struct md_req * mdr)1569 mdresize(struct md_s *sc, struct md_req *mdr)
1570 {
1571 int error, res;
1572 vm_pindex_t oldpages, newpages;
1573
1574 switch (sc->type) {
1575 case MD_VNODE:
1576 case MD_NULL:
1577 break;
1578 case MD_SWAP:
1579 if (mdr->md_mediasize <= 0 ||
1580 (mdr->md_mediasize % PAGE_SIZE) != 0)
1581 return (EDOM);
1582 oldpages = OFF_TO_IDX(sc->mediasize);
1583 newpages = OFF_TO_IDX(mdr->md_mediasize);
1584 if (newpages < oldpages) {
1585 VM_OBJECT_WLOCK(sc->object);
1586 vm_object_page_remove(sc->object, newpages, 0, 0);
1587 swap_release_by_cred(IDX_TO_OFF(oldpages -
1588 newpages), sc->cred);
1589 sc->object->charge = IDX_TO_OFF(newpages);
1590 sc->object->size = newpages;
1591 VM_OBJECT_WUNLOCK(sc->object);
1592 } else if (newpages > oldpages) {
1593 res = swap_reserve_by_cred(IDX_TO_OFF(newpages -
1594 oldpages), sc->cred);
1595 if (!res)
1596 return (ENOMEM);
1597 if ((mdr->md_options & MD_RESERVE) ||
1598 (sc->flags & MD_RESERVE)) {
1599 error = swap_pager_reserve(sc->object,
1600 oldpages, newpages - oldpages);
1601 if (error < 0) {
1602 swap_release_by_cred(
1603 IDX_TO_OFF(newpages - oldpages),
1604 sc->cred);
1605 return (EDOM);
1606 }
1607 }
1608 VM_OBJECT_WLOCK(sc->object);
1609 sc->object->charge = IDX_TO_OFF(newpages);
1610 sc->object->size = newpages;
1611 VM_OBJECT_WUNLOCK(sc->object);
1612 }
1613 break;
1614 default:
1615 return (EOPNOTSUPP);
1616 }
1617
1618 sc->mediasize = mdr->md_mediasize;
1619
1620 g_topology_lock();
1621 g_resize_provider(sc->pp, sc->mediasize);
1622 g_topology_unlock();
1623 return (0);
1624 }
1625
1626 static int
mdcreate_swap(struct md_s * sc,struct md_req * mdr,struct thread * td)1627 mdcreate_swap(struct md_s *sc, struct md_req *mdr, struct thread *td)
1628 {
1629 vm_ooffset_t npage;
1630 int error;
1631
1632 /*
1633 * Range check. Disallow negative sizes and sizes not being
1634 * multiple of page size.
1635 */
1636 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0)
1637 return (EDOM);
1638
1639 /*
1640 * Allocate an OBJT_SWAP object.
1641 *
1642 * Note the truncation.
1643 */
1644
1645 if ((mdr->md_options & MD_VERIFY) != 0)
1646 return (EINVAL);
1647 npage = mdr->md_mediasize / PAGE_SIZE;
1648 if (mdr->md_fwsectors != 0)
1649 sc->fwsectors = mdr->md_fwsectors;
1650 if (mdr->md_fwheads != 0)
1651 sc->fwheads = mdr->md_fwheads;
1652 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage,
1653 VM_PROT_DEFAULT, 0, td->td_ucred);
1654 if (sc->object == NULL)
1655 return (ENOMEM);
1656 sc->flags = mdr->md_options & (MD_FORCE | MD_RESERVE);
1657 if (mdr->md_options & MD_RESERVE) {
1658 if (swap_pager_reserve(sc->object, 0, npage) < 0) {
1659 error = EDOM;
1660 goto finish;
1661 }
1662 }
1663 error = mdsetcred(sc, td->td_ucred);
1664 finish:
1665 if (error != 0) {
1666 vm_object_deallocate(sc->object);
1667 sc->object = NULL;
1668 }
1669 return (error);
1670 }
1671
1672 static int
mdcreate_null(struct md_s * sc,struct md_req * mdr,struct thread * td)1673 mdcreate_null(struct md_s *sc, struct md_req *mdr, struct thread *td)
1674 {
1675
1676 /*
1677 * Range check. Disallow negative sizes and sizes not being
1678 * multiple of page size.
1679 */
1680 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0)
1681 return (EDOM);
1682
1683 return (0);
1684 }
1685
1686 static int
kern_mdattach_locked(struct thread * td,struct md_req * mdr)1687 kern_mdattach_locked(struct thread *td, struct md_req *mdr)
1688 {
1689 struct md_s *sc;
1690 unsigned sectsize;
1691 int error;
1692
1693 sx_assert(&md_sx, SA_XLOCKED);
1694
1695 switch (mdr->md_type) {
1696 case MD_MALLOC:
1697 case MD_PRELOAD:
1698 case MD_VNODE:
1699 case MD_SWAP:
1700 case MD_NULL:
1701 break;
1702 default:
1703 return (EINVAL);
1704 }
1705 if (mdr->md_sectorsize == 0)
1706 sectsize = DEV_BSIZE;
1707 else
1708 sectsize = mdr->md_sectorsize;
1709 if (sectsize > maxphys || mdr->md_mediasize < sectsize)
1710 return (EINVAL);
1711 if (mdr->md_options & MD_AUTOUNIT)
1712 sc = mdnew(-1, &error, mdr->md_type);
1713 else {
1714 if (mdr->md_unit > INT_MAX)
1715 return (EINVAL);
1716 sc = mdnew(mdr->md_unit, &error, mdr->md_type);
1717 }
1718 if (sc == NULL)
1719 return (error);
1720 if (mdr->md_label != NULL)
1721 error = copyinstr(mdr->md_label, sc->label,
1722 sizeof(sc->label), NULL);
1723 if (error != 0)
1724 goto err_after_new;
1725 if (mdr->md_options & MD_AUTOUNIT)
1726 mdr->md_unit = sc->unit;
1727 sc->mediasize = mdr->md_mediasize;
1728 sc->sectorsize = sectsize;
1729 sc->candelete = true;
1730 error = EDOOFUS;
1731 switch (sc->type) {
1732 case MD_MALLOC:
1733 sc->start = mdstart_malloc;
1734 error = mdcreate_malloc(sc, mdr);
1735 break;
1736 case MD_PRELOAD:
1737 /*
1738 * We disallow attaching preloaded memory disks via
1739 * ioctl. Preloaded memory disks are automatically
1740 * attached in g_md_init().
1741 */
1742 error = EOPNOTSUPP;
1743 break;
1744 case MD_VNODE:
1745 sc->start = mdstart_vnode;
1746 error = mdcreate_vnode(sc, mdr, td);
1747 break;
1748 case MD_SWAP:
1749 sc->start = mdstart_swap;
1750 error = mdcreate_swap(sc, mdr, td);
1751 break;
1752 case MD_NULL:
1753 sc->start = mdstart_null;
1754 error = mdcreate_null(sc, mdr, td);
1755 break;
1756 }
1757 err_after_new:
1758 if (error != 0) {
1759 mddestroy(sc, td);
1760 return (error);
1761 }
1762
1763 mdinit(sc);
1764 return (0);
1765 }
1766
1767 static int
kern_mdattach(struct thread * td,struct md_req * mdr)1768 kern_mdattach(struct thread *td, struct md_req *mdr)
1769 {
1770 int error;
1771
1772 sx_xlock(&md_sx);
1773 error = kern_mdattach_locked(td, mdr);
1774 sx_xunlock(&md_sx);
1775 return (error);
1776 }
1777
1778 static int
kern_mddetach_locked(struct thread * td,struct md_req * mdr)1779 kern_mddetach_locked(struct thread *td, struct md_req *mdr)
1780 {
1781 struct md_s *sc;
1782
1783 sx_assert(&md_sx, SA_XLOCKED);
1784
1785 if (mdr->md_mediasize != 0 ||
1786 (mdr->md_options & ~MD_FORCE) != 0)
1787 return (EINVAL);
1788
1789 sc = mdfind(mdr->md_unit);
1790 if (sc == NULL)
1791 return (ENOENT);
1792 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) &&
1793 !(mdr->md_options & MD_FORCE))
1794 return (EBUSY);
1795 return (mddestroy(sc, td));
1796 }
1797
1798 static int
kern_mddetach(struct thread * td,struct md_req * mdr)1799 kern_mddetach(struct thread *td, struct md_req *mdr)
1800 {
1801 int error;
1802
1803 sx_xlock(&md_sx);
1804 error = kern_mddetach_locked(td, mdr);
1805 sx_xunlock(&md_sx);
1806 return (error);
1807 }
1808
1809 static int
kern_mdresize_locked(struct md_req * mdr)1810 kern_mdresize_locked(struct md_req *mdr)
1811 {
1812 struct md_s *sc;
1813
1814 sx_assert(&md_sx, SA_XLOCKED);
1815
1816 if ((mdr->md_options & ~(MD_FORCE | MD_RESERVE)) != 0)
1817 return (EINVAL);
1818
1819 sc = mdfind(mdr->md_unit);
1820 if (sc == NULL)
1821 return (ENOENT);
1822 if (mdr->md_mediasize < sc->sectorsize)
1823 return (EINVAL);
1824 mdr->md_mediasize -= mdr->md_mediasize % sc->sectorsize;
1825 if (mdr->md_mediasize < sc->mediasize &&
1826 !(sc->flags & MD_FORCE) &&
1827 !(mdr->md_options & MD_FORCE))
1828 return (EBUSY);
1829 return (mdresize(sc, mdr));
1830 }
1831
1832 static int
kern_mdresize(struct md_req * mdr)1833 kern_mdresize(struct md_req *mdr)
1834 {
1835 int error;
1836
1837 sx_xlock(&md_sx);
1838 error = kern_mdresize_locked(mdr);
1839 sx_xunlock(&md_sx);
1840 return (error);
1841 }
1842
1843 static int
kern_mdquery_locked(struct md_req * mdr)1844 kern_mdquery_locked(struct md_req *mdr)
1845 {
1846 struct md_s *sc;
1847 int error;
1848
1849 sx_assert(&md_sx, SA_XLOCKED);
1850
1851 sc = mdfind(mdr->md_unit);
1852 if (sc == NULL)
1853 return (ENOENT);
1854 mdr->md_type = sc->type;
1855 mdr->md_options = sc->flags;
1856 mdr->md_mediasize = sc->mediasize;
1857 mdr->md_sectorsize = sc->sectorsize;
1858 error = 0;
1859 if (mdr->md_label != NULL) {
1860 error = copyout(sc->label, mdr->md_label,
1861 strlen(sc->label) + 1);
1862 if (error != 0)
1863 return (error);
1864 }
1865 if (sc->type == MD_VNODE ||
1866 (sc->type == MD_PRELOAD && mdr->md_file != NULL))
1867 error = copyout(sc->file, mdr->md_file,
1868 strlen(sc->file) + 1);
1869 return (error);
1870 }
1871
1872 static int
kern_mdquery(struct md_req * mdr)1873 kern_mdquery(struct md_req *mdr)
1874 {
1875 int error;
1876
1877 sx_xlock(&md_sx);
1878 error = kern_mdquery_locked(mdr);
1879 sx_xunlock(&md_sx);
1880 return (error);
1881 }
1882
1883 /* Copy members that are not userspace pointers. */
1884 #define MD_IOCTL2REQ(mdio, mdr) do { \
1885 (mdr)->md_unit = (mdio)->md_unit; \
1886 (mdr)->md_type = (mdio)->md_type; \
1887 (mdr)->md_mediasize = (mdio)->md_mediasize; \
1888 (mdr)->md_sectorsize = (mdio)->md_sectorsize; \
1889 (mdr)->md_options = (mdio)->md_options; \
1890 (mdr)->md_fwheads = (mdio)->md_fwheads; \
1891 (mdr)->md_fwsectors = (mdio)->md_fwsectors; \
1892 (mdr)->md_units = &(mdio)->md_pad[0]; \
1893 (mdr)->md_units_nitems = nitems((mdio)->md_pad); \
1894 } while(0)
1895
1896 /* Copy members that might have been updated */
1897 #define MD_REQ2IOCTL(mdr, mdio) do { \
1898 (mdio)->md_unit = (mdr)->md_unit; \
1899 (mdio)->md_type = (mdr)->md_type; \
1900 (mdio)->md_mediasize = (mdr)->md_mediasize; \
1901 (mdio)->md_sectorsize = (mdr)->md_sectorsize; \
1902 (mdio)->md_options = (mdr)->md_options; \
1903 (mdio)->md_fwheads = (mdr)->md_fwheads; \
1904 (mdio)->md_fwsectors = (mdr)->md_fwsectors; \
1905 } while(0)
1906
1907 static int
mdctlioctl(struct cdev * dev,u_long cmd,caddr_t addr,int flags,struct thread * td)1908 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
1909 struct thread *td)
1910 {
1911 struct md_req mdr;
1912 int error;
1913
1914 if (md_debug)
1915 printf("mdctlioctl(%s %lx %p %x %p)\n",
1916 devtoname(dev), cmd, addr, flags, td);
1917
1918 bzero(&mdr, sizeof(mdr));
1919 switch (cmd) {
1920 case MDIOCATTACH:
1921 case MDIOCDETACH:
1922 case MDIOCRESIZE:
1923 case MDIOCQUERY: {
1924 struct md_ioctl *mdio = (struct md_ioctl *)addr;
1925 if (mdio->md_version != MDIOVERSION)
1926 return (EINVAL);
1927 MD_IOCTL2REQ(mdio, &mdr);
1928 mdr.md_file = mdio->md_file;
1929 mdr.md_file_seg = UIO_USERSPACE;
1930 /* If the file is adjacent to the md_ioctl it's in kernel. */
1931 if ((void *)mdio->md_file == (void *)(mdio + 1))
1932 mdr.md_file_seg = UIO_SYSSPACE;
1933 mdr.md_label = mdio->md_label;
1934 break;
1935 }
1936 #ifdef COMPAT_FREEBSD32
1937 case MDIOCATTACH_32:
1938 case MDIOCDETACH_32:
1939 case MDIOCRESIZE_32:
1940 case MDIOCQUERY_32: {
1941 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr;
1942 if (mdio->md_version != MDIOVERSION)
1943 return (EINVAL);
1944 MD_IOCTL2REQ(mdio, &mdr);
1945 mdr.md_file = (void *)(uintptr_t)mdio->md_file;
1946 mdr.md_file_seg = UIO_USERSPACE;
1947 mdr.md_label = (void *)(uintptr_t)mdio->md_label;
1948 break;
1949 }
1950 #endif
1951 default:
1952 /* Fall through to handler switch. */
1953 break;
1954 }
1955
1956 error = 0;
1957 switch (cmd) {
1958 case MDIOCATTACH:
1959 #ifdef COMPAT_FREEBSD32
1960 case MDIOCATTACH_32:
1961 #endif
1962 error = kern_mdattach(td, &mdr);
1963 break;
1964 case MDIOCDETACH:
1965 #ifdef COMPAT_FREEBSD32
1966 case MDIOCDETACH_32:
1967 #endif
1968 error = kern_mddetach(td, &mdr);
1969 break;
1970 case MDIOCRESIZE:
1971 #ifdef COMPAT_FREEBSD32
1972 case MDIOCRESIZE_32:
1973 #endif
1974 error = kern_mdresize(&mdr);
1975 break;
1976 case MDIOCQUERY:
1977 #ifdef COMPAT_FREEBSD32
1978 case MDIOCQUERY_32:
1979 #endif
1980 error = kern_mdquery(&mdr);
1981 break;
1982 default:
1983 error = ENOIOCTL;
1984 }
1985
1986 switch (cmd) {
1987 case MDIOCATTACH:
1988 case MDIOCQUERY: {
1989 struct md_ioctl *mdio = (struct md_ioctl *)addr;
1990 MD_REQ2IOCTL(&mdr, mdio);
1991 break;
1992 }
1993 #ifdef COMPAT_FREEBSD32
1994 case MDIOCATTACH_32:
1995 case MDIOCQUERY_32: {
1996 struct md_ioctl32 *mdio = (struct md_ioctl32 *)addr;
1997 MD_REQ2IOCTL(&mdr, mdio);
1998 break;
1999 }
2000 #endif
2001 default:
2002 /* Other commands to not alter mdr. */
2003 break;
2004 }
2005
2006 return (error);
2007 }
2008
2009 static void
md_preloaded(u_char * image,size_t length,const char * name)2010 md_preloaded(u_char *image, size_t length, const char *name)
2011 {
2012 struct md_s *sc;
2013 int error;
2014
2015 sc = mdnew(-1, &error, MD_PRELOAD);
2016 if (sc == NULL)
2017 return;
2018 sc->mediasize = length;
2019 sc->sectorsize = DEV_BSIZE;
2020 sc->pl_ptr = image;
2021 sc->pl_len = length;
2022 sc->start = mdstart_preload;
2023 if (name != NULL)
2024 strlcpy(sc->file, name, sizeof(sc->file));
2025 #ifdef MD_ROOT
2026 if (sc->unit == 0) {
2027 #ifndef ROOTDEVNAME
2028 rootdevnames[0] = MD_ROOT_FSTYPE ":/dev/md0";
2029 #endif
2030 #ifdef MD_ROOT_READONLY
2031 sc->flags |= MD_READONLY;
2032 #endif
2033 }
2034 #endif
2035 mdinit(sc);
2036 if (name != NULL) {
2037 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n",
2038 MD_NAME, sc->unit, name, length, image);
2039 } else {
2040 printf("%s%d: Embedded image %zd bytes at %p\n",
2041 MD_NAME, sc->unit, length, image);
2042 }
2043 }
2044
2045 static void
g_md_init(struct g_class * mp __unused)2046 g_md_init(struct g_class *mp __unused)
2047 {
2048 caddr_t mod;
2049 u_char *ptr, *name, *type;
2050 unsigned len;
2051 int i;
2052
2053 /* figure out log2(NINDIR) */
2054 for (i = NINDIR, nshift = -1; i; nshift++)
2055 i >>= 1;
2056
2057 mod = NULL;
2058 sx_init(&md_sx, "MD config lock");
2059 g_topology_unlock();
2060 md_uh = new_unrhdr(0, INT_MAX, NULL);
2061 #ifdef MD_ROOT
2062 if (mfs_root_size != 0) {
2063 sx_xlock(&md_sx);
2064 #ifdef MD_ROOT_MEM
2065 md_preloaded(mfs_root, mfs_root_size, NULL);
2066 #else
2067 md_preloaded(__DEVOLATILE(u_char *, &mfs_root), mfs_root_size,
2068 NULL);
2069 #endif
2070 sx_xunlock(&md_sx);
2071 }
2072 #endif
2073 /* XXX: are preload_* static or do they need Giant ? */
2074 while ((mod = preload_search_next_name(mod)) != NULL) {
2075 name = (char *)preload_search_info(mod, MODINFO_NAME);
2076 if (name == NULL)
2077 continue;
2078 type = (char *)preload_search_info(mod, MODINFO_TYPE);
2079 if (type == NULL)
2080 continue;
2081 if (strcmp(type, "md_image") && strcmp(type, "mfs_root"))
2082 continue;
2083 ptr = preload_fetch_addr(mod);
2084 len = preload_fetch_size(mod);
2085 if (ptr != NULL && len != 0) {
2086 sx_xlock(&md_sx);
2087 md_preloaded(ptr, len, name);
2088 sx_xunlock(&md_sx);
2089 }
2090 }
2091 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL,
2092 0600, MDCTL_NAME);
2093 g_topology_lock();
2094 }
2095
2096 static void
g_md_dumpconf(struct sbuf * sb,const char * indent,struct g_geom * gp,struct g_consumer * cp __unused,struct g_provider * pp)2097 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
2098 struct g_consumer *cp __unused, struct g_provider *pp)
2099 {
2100 struct md_s *mp;
2101 char *type;
2102
2103 mp = gp->softc;
2104 if (mp == NULL)
2105 return;
2106
2107 switch (mp->type) {
2108 case MD_MALLOC:
2109 type = "malloc";
2110 break;
2111 case MD_PRELOAD:
2112 type = "preload";
2113 break;
2114 case MD_VNODE:
2115 type = "vnode";
2116 break;
2117 case MD_SWAP:
2118 type = "swap";
2119 break;
2120 case MD_NULL:
2121 type = "null";
2122 break;
2123 default:
2124 type = "unknown";
2125 break;
2126 }
2127
2128 if (pp != NULL) {
2129 if (indent == NULL) {
2130 sbuf_printf(sb, " u %d", mp->unit);
2131 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize);
2132 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads);
2133 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors);
2134 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize);
2135 sbuf_printf(sb, " t %s", type);
2136 if ((mp->type == MD_VNODE && mp->vnode != NULL) ||
2137 (mp->type == MD_PRELOAD && mp->file[0] != '\0'))
2138 sbuf_printf(sb, " file %s", mp->file);
2139 sbuf_printf(sb, " label %s", mp->label);
2140 } else {
2141 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent,
2142 mp->unit);
2143 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n",
2144 indent, (uintmax_t) mp->sectorsize);
2145 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n",
2146 indent, (uintmax_t) mp->fwheads);
2147 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n",
2148 indent, (uintmax_t) mp->fwsectors);
2149 if (mp->ident[0] != '\0') {
2150 sbuf_printf(sb, "%s<ident>", indent);
2151 g_conf_printf_escaped(sb, "%s", mp->ident);
2152 sbuf_printf(sb, "</ident>\n");
2153 }
2154 sbuf_printf(sb, "%s<length>%ju</length>\n",
2155 indent, (uintmax_t) mp->mediasize);
2156 sbuf_printf(sb, "%s<compression>%s</compression>\n", indent,
2157 (mp->flags & MD_COMPRESS) == 0 ? "off": "on");
2158 sbuf_printf(sb, "%s<access>%s</access>\n", indent,
2159 (mp->flags & MD_READONLY) == 0 ? "read-write":
2160 "read-only");
2161 sbuf_printf(sb, "%s<type>%s</type>\n", indent,
2162 type);
2163 if ((mp->type == MD_VNODE && mp->vnode != NULL) ||
2164 (mp->type == MD_PRELOAD && mp->file[0] != '\0')) {
2165 sbuf_printf(sb, "%s<file>", indent);
2166 g_conf_printf_escaped(sb, "%s", mp->file);
2167 sbuf_printf(sb, "</file>\n");
2168 }
2169 if (mp->type == MD_VNODE)
2170 sbuf_printf(sb, "%s<cache>%s</cache>\n", indent,
2171 (mp->flags & MD_CACHE) == 0 ? "off": "on");
2172 sbuf_printf(sb, "%s<label>", indent);
2173 g_conf_printf_escaped(sb, "%s", mp->label);
2174 sbuf_printf(sb, "</label>\n");
2175 }
2176 }
2177 }
2178
2179 static void
g_md_fini(struct g_class * mp __unused)2180 g_md_fini(struct g_class *mp __unused)
2181 {
2182
2183 sx_destroy(&md_sx);
2184 if (status_dev != NULL)
2185 destroy_dev(status_dev);
2186 delete_unrhdr(md_uh);
2187 }
2188