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