devfs - Change make_dev_covering to use dev_ops
[dragonfly.git] / sys / kern / subr_disk.c
CommitLineData
984263bc 1/*
149e86b9 2 * Copyright (c) 2003,2004,2009 The DragonFly Project. All rights reserved.
d7d5e114 3 *
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4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
d7d5e114 6 *
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7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
d7d5e114 10 *
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11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
d7d5e114 20 *
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21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
d7d5e114 33 *
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34 * ----------------------------------------------------------------------------
35 * "THE BEER-WARE LICENSE" (Revision 42):
36 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
37 * can do whatever you want with this stuff. If we meet some day, and you think
38 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
39 * ----------------------------------------------------------------------------
40 *
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41 * Copyright (c) 1982, 1986, 1988, 1993
42 * The Regents of the University of California. All rights reserved.
43 * (c) UNIX System Laboratories, Inc.
44 * All or some portions of this file are derived from material licensed
45 * to the University of California by American Telephone and Telegraph
46 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
47 * the permission of UNIX System Laboratories, Inc.
48 *
49 * Redistribution and use in source and binary forms, with or without
50 * modification, are permitted provided that the following conditions
51 * are met:
52 * 1. Redistributions of source code must retain the above copyright
53 * notice, this list of conditions and the following disclaimer.
54 * 2. Redistributions in binary form must reproduce the above copyright
55 * notice, this list of conditions and the following disclaimer in the
56 * documentation and/or other materials provided with the distribution.
57 * 3. All advertising materials mentioning features or use of this software
58 * must display the following acknowledgement:
59 * This product includes software developed by the University of
60 * California, Berkeley and its contributors.
61 * 4. Neither the name of the University nor the names of its contributors
62 * may be used to endorse or promote products derived from this software
63 * without specific prior written permission.
64 *
65 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
66 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
67 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
68 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
69 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
70 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
72 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
73 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
75 * SUCH DAMAGE.
984263bc 76 *
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77 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
78 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $
79 * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $
3641b7ca 80 * $DragonFly: src/sys/kern/subr_disk.c,v 1.40 2008/06/05 18:06:32 swildner Exp $
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81 */
82
83#include <sys/param.h>
84#include <sys/systm.h>
85#include <sys/kernel.h>
7a9e53ad 86#include <sys/proc.h>
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87#include <sys/sysctl.h>
88#include <sys/buf.h>
89#include <sys/conf.h>
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90#include <sys/disklabel.h>
91#include <sys/disklabel32.h>
92#include <sys/disklabel64.h>
7a9e53ad 93#include <sys/diskslice.h>
cd29885a 94#include <sys/diskmbr.h>
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95#include <sys/disk.h>
96#include <sys/malloc.h>
97#include <sys/sysctl.h>
98#include <machine/md_var.h>
99#include <sys/ctype.h>
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100#include <sys/syslog.h>
101#include <sys/device.h>
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102#include <sys/msgport.h>
103#include <sys/msgport2.h>
7a9e53ad 104#include <sys/buf2.h>
2c1e28dd 105#include <sys/devfs.h>
be755ff9 106#include <sys/thread.h>
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107#include <sys/thread2.h>
108
109#include <sys/queue.h>
110#include <sys/lock.h>
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111
112static MALLOC_DEFINE(M_DISK, "disk", "disk data");
8c05caab 113static int disk_debug_enable = 0;
984263bc 114
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115static void disk_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
116static void disk_msg_core(void *);
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117static int disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe);
118static void disk_probe(struct disk *dp, int reprobe);
119static void _setdiskinfo(struct disk *disk, struct disk_info *info);
30e5862e 120static void bioqwritereorder(struct bio_queue_head *bioq);
fbbbca99 121static void disk_cleanserial(char *serno);
cd29885a 122
984263bc 123static d_open_t diskopen;
d7d5e114 124static d_close_t diskclose;
984263bc 125static d_ioctl_t diskioctl;
fef8985e 126static d_strategy_t diskstrategy;
984263bc 127static d_psize_t diskpsize;
e4c9c0c8 128static d_clone_t diskclone;
fef8985e 129static d_dump_t diskdump;
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130
131static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
be755ff9 132static struct lwkt_token disklist_token;
984263bc 133
fef8985e 134static struct dev_ops disk_ops = {
daf0c2f6 135 { "disk", 0, D_DISK },
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136 .d_open = diskopen,
137 .d_close = diskclose,
138 .d_read = physread,
139 .d_write = physwrite,
140 .d_ioctl = diskioctl,
141 .d_strategy = diskstrategy,
142 .d_dump = diskdump,
143 .d_psize = diskpsize,
144 .d_clone = diskclone
145};
146
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147static struct objcache *disk_msg_cache;
148
149struct objcache_malloc_args disk_msg_malloc_args = {
150 sizeof(struct disk_msg), M_DISK };
151
152static struct lwkt_port disk_dispose_port;
153static struct lwkt_port disk_msg_port;
154
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155static int
156disk_debug(int level, char *fmt, ...)
157{
158 __va_list ap;
159
160 __va_start(ap, fmt);
161 if (level <= disk_debug_enable)
162 kvprintf(fmt, ap);
163 __va_end(ap);
164
165 return 0;
166}
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167
168static int
aec8eea4 169disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe)
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170{
171 struct disk_info *info = &dp->d_info;
172 struct diskslice *sp = &dp->d_slice->dss_slices[slice];
173 disklabel_ops_t ops;
174 struct partinfo part;
175 const char *msg;
176 cdev_t ndev;
440a040b 177 int sno;
539f339e 178 u_int i;
cd29885a 179
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AH
180 disk_debug(2,
181 "disk_probe_slice (begin): %s (%s)\n",
182 dev->si_name, dp->d_cdev->si_name);
183
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184 sno = slice ? slice - 1 : 0;
185
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186 ops = &disklabel32_ops;
187 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
188 if (msg && !strcmp(msg, "no disk label")) {
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189 ops = &disklabel64_ops;
190 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
191 }
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192 if (msg == NULL) {
193 if (slice != WHOLE_DISK_SLICE)
194 ops->op_adjust_label_reserved(dp->d_slice, slice, sp);
195 else
196 sp->ds_reserved = 0;
197
198 sp->ds_ops = ops;
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199 for (i = 0; i < ops->op_getnumparts(sp->ds_label); i++) {
200 ops->op_loadpartinfo(sp->ds_label, i, &part);
cd29885a 201 if (part.fstype) {
aec8eea4 202 if (reprobe &&
149e86b9 203 (ndev = devfs_find_device_by_name("%s%c",
440a040b 204 dev->si_name, 'a' + i))
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205 ) {
206 /*
207 * Device already exists and
208 * is still valid.
209 */
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210 ndev->si_flags |= SI_REPROBE_TEST;
211 } else {
b17f0c0d 212 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
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213 dkmakeminor(dkunit(dp->d_cdev),
214 slice, i),
aec8eea4 215 UID_ROOT, GID_OPERATOR, 0640,
440a040b 216 "%s%c", dev->si_name, 'a'+ i);
aec8eea4 217 ndev->si_disk = dp;
55230951 218 if (dp->d_info.d_serialno) {
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219 make_dev_alias(ndev,
220 "serno/%s.s%d%c",
221 dp->d_info.d_serialno,
440a040b 222 sno, 'a' + i);
55230951 223 }
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224 ndev->si_flags |= SI_REPROBE_TEST;
225 }
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226 }
227 }
228 } else if (info->d_dsflags & DSO_COMPATLABEL) {
229 msg = NULL;
230 if (sp->ds_size >= 0x100000000ULL)
231 ops = &disklabel64_ops;
232 else
233 ops = &disklabel32_ops;
234 sp->ds_label = ops->op_clone_label(info, sp);
235 } else {
149e86b9 236 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) {
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237 log(LOG_WARNING, "%s: cannot find label (%s)\n",
238 dev->si_name, msg);
149e86b9 239 }
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240 }
241
242 if (msg == NULL) {
243 sp->ds_wlabel = FALSE;
244 }
245
246 return (msg ? EINVAL : 0);
247}
248
249
250static void
aec8eea4 251disk_probe(struct disk *dp, int reprobe)
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252{
253 struct disk_info *info = &dp->d_info;
254 cdev_t dev = dp->d_cdev;
255 cdev_t ndev;
0831f2ab
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256 int error, i, sno;
257 struct diskslice *sp;
cd29885a 258
cd29885a 259 KKASSERT (info->d_media_blksize != 0);
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260
261 dp->d_slice = dsmakeslicestruct(BASE_SLICE, info);
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262 disk_debug(1,
263 "disk_probe (begin): %s\n",
264 dp->d_cdev->si_name);
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265
266 error = mbrinit(dev, info, &(dp->d_slice));
0831f2ab 267 if (error)
cd29885a 268 return;
aec8eea4 269
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270 for (i = 0; i < dp->d_slice->dss_nslices; i++) {
271 /*
272 * Ignore the whole-disk slice, it has already been created.
273 */
274 if (i == WHOLE_DISK_SLICE)
275 continue;
276 sp = &dp->d_slice->dss_slices[i];
277
278 /*
279 * Handle s0. s0 is a compatibility slice if there are no
280 * other slices and it has not otherwise been set up, else
281 * we ignore it.
282 */
283 if (i == COMPATIBILITY_SLICE) {
284 sno = 0;
285 if (sp->ds_type == 0 &&
286 dp->d_slice->dss_nslices == BASE_SLICE) {
287 sp->ds_size = info->d_media_blocks;
288 sp->ds_reserved = 0;
aec8eea4 289 }
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290 } else {
291 sno = i - 1;
292 sp->ds_reserved = 0;
cd29885a 293 }
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294
295 /*
296 * Ignore 0-length slices
297 */
298 if (sp->ds_size == 0)
299 continue;
300
301 if (reprobe &&
302 (ndev = devfs_find_device_by_name("%ss%d",
303 dev->si_name, sno))) {
304 /*
305 * Device already exists and is still valid
306 */
307 ndev->si_flags |= SI_REPROBE_TEST;
308 } else {
309 /*
310 * Else create new device
311 */
b17f0c0d 312 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
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313 dkmakewholeslice(dkunit(dev), i),
314 UID_ROOT, GID_OPERATOR, 0640,
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315 "%ss%d", dev->si_name, sno);
316 if (dp->d_info.d_serialno) {
317 make_dev_alias(ndev, "serno/%s.s%d",
318 dp->d_info.d_serialno, sno);
cd29885a 319 }
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320 ndev->si_disk = dp;
321 ndev->si_flags |= SI_REPROBE_TEST;
322 }
323 sp->ds_dev = ndev;
149e86b9 324
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325 /*
326 * Probe appropriate slices for a disklabel
327 *
328 * XXX slice type 1 used by our gpt probe code.
d7d5e114 329 * XXX slice type 0 used by mbr compat slice.
1cb0bdb6 330 */
d7d5e114 331 if (sp->ds_type == DOSPTYP_386BSD || sp->ds_type == 0 ||
9daebf8f 332 sp->ds_type == 1 || sp->ds_type == DOSPTYP_NBSD) {
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333 if (dp->d_slice->dss_first_bsd_slice == 0)
334 dp->d_slice->dss_first_bsd_slice = i;
335 disk_probe_slice(dp, ndev, i, reprobe);
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336 }
337 }
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338 disk_debug(1,
339 "disk_probe (end): %s\n",
340 dp->d_cdev->si_name);
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341}
342
343
344static void
345disk_msg_core(void *arg)
346{
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347 struct disk *dp;
348 struct diskslice *sp;
be755ff9 349 lwkt_tokref ilock;
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350 disk_msg_t msg;
351 int run;
cd29885a 352
cd29885a
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353 lwkt_initport_thread(&disk_msg_port, curthread);
354 wakeup(curthread);
149e86b9 355 run = 1;
cd29885a 356
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357 while (run) {
358 msg = (disk_msg_t)lwkt_waitport(&disk_msg_port, 0);
cd29885a 359
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360 switch (msg->hdr.u.ms_result) {
361 case DISK_DISK_PROBE:
cd29885a 362 dp = (struct disk *)msg->load;
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AH
363 disk_debug(1,
364 "DISK_DISK_PROBE: %s\n",
365 dp->d_cdev->si_name);
aec8eea4 366 disk_probe(dp, 0);
cd29885a 367 break;
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368 case DISK_DISK_DESTROY:
369 dp = (struct disk *)msg->load;
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AH
370 disk_debug(1,
371 "DISK_DISK_DESTROY: %s\n",
372 dp->d_cdev->si_name);
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373 devfs_destroy_subnames(dp->d_cdev->si_name);
374 devfs_destroy_dev(dp->d_cdev);
be755ff9 375 lwkt_gettoken(&ilock, &disklist_token);
aec8eea4 376 LIST_REMOVE(dp, d_list);
be755ff9 377 lwkt_reltoken(&ilock);
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378 if (dp->d_info.d_serialno) {
379 kfree(dp->d_info.d_serialno, M_TEMP);
380 dp->d_info.d_serialno = NULL;
381 }
cd29885a 382 break;
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383 case DISK_UNPROBE:
384 dp = (struct disk *)msg->load;
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AH
385 disk_debug(1,
386 "DISK_DISK_UNPROBE: %s\n",
387 dp->d_cdev->si_name);
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388 devfs_destroy_subnames(dp->d_cdev->si_name);
389 break;
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390 case DISK_SLICE_REPROBE:
391 dp = (struct disk *)msg->load;
392 sp = (struct diskslice *)msg->load2;
149e86b9
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393 devfs_clr_subnames_flag(sp->ds_dev->si_name,
394 SI_REPROBE_TEST);
8c05caab 395 disk_debug(1,
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MD
396 "DISK_SLICE_REPROBE: %s\n",
397 sp->ds_dev->si_name);
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398 disk_probe_slice(dp, sp->ds_dev,
399 dkslice(sp->ds_dev), 1);
400 devfs_destroy_subnames_without_flag(
401 sp->ds_dev->si_name, SI_REPROBE_TEST);
cd29885a 402 break;
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403 case DISK_DISK_REPROBE:
404 dp = (struct disk *)msg->load;
aec8eea4 405 devfs_clr_subnames_flag(dp->d_cdev->si_name, SI_REPROBE_TEST);
8c05caab 406 disk_debug(1,
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407 "DISK_DISK_REPROBE: %s\n",
408 dp->d_cdev->si_name);
409 disk_probe(dp, 1);
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410 devfs_destroy_subnames_without_flag(
411 dp->d_cdev->si_name, SI_REPROBE_TEST);
cd29885a 412 break;
cd29885a 413 case DISK_SYNC:
8c05caab 414 disk_debug(1, "DISK_SYNC\n");
cd29885a 415 break;
149e86b9
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416 default:
417 devfs_debug(DEVFS_DEBUG_WARNING,
418 "disk_msg_core: unknown message "
419 "received at core\n");
420 break;
421 }
422 lwkt_replymsg((lwkt_msg_t)msg, 0);
423 }
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424 lwkt_exit();
425}
426
427
149e86b9
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428/*
429 * Acts as a message drain. Any message that is replied to here gets
430 * destroyed and the memory freed.
431 */
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432static void
433disk_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
434{
149e86b9 435 objcache_put(disk_msg_cache, msg);
cd29885a
MD
436}
437
438
439void
440disk_msg_send(uint32_t cmd, void *load, void *load2)
441{
149e86b9 442 disk_msg_t disk_msg;
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443 lwkt_port_t port = &disk_msg_port;
444
149e86b9 445 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
cd29885a 446
149e86b9 447 lwkt_initmsg(&disk_msg->hdr, &disk_dispose_port, 0);
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448
449 disk_msg->hdr.u.ms_result = cmd;
450 disk_msg->load = load;
451 disk_msg->load2 = load2;
452 KKASSERT(port);
149e86b9 453 lwkt_sendmsg(port, (lwkt_msg_t)disk_msg);
cd29885a
MD
454}
455
aec8eea4
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456void
457disk_msg_send_sync(uint32_t cmd, void *load, void *load2)
458{
459 struct lwkt_port rep_port;
460 disk_msg_t disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
461 disk_msg_t msg_incoming;
462 lwkt_port_t port = &disk_msg_port;
463
464 lwkt_initport_thread(&rep_port, curthread);
465 lwkt_initmsg(&disk_msg->hdr, &rep_port, 0);
466
467 disk_msg->hdr.u.ms_result = cmd;
468 disk_msg->load = load;
469 disk_msg->load2 = load2;
470
471 KKASSERT(port);
149e86b9 472 lwkt_sendmsg(port, (lwkt_msg_t)disk_msg);
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473 msg_incoming = lwkt_waitport(&rep_port, 0);
474}
475
335dda38 476/*
fef8985e
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477 * Create a raw device for the dev_ops template (which is returned). Also
478 * create a slice and unit managed disk and overload the user visible
479 * device space with it.
e4c9c0c8 480 *
fef8985e
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481 * NOTE: The returned raw device is NOT a slice and unit managed device.
482 * It is an actual raw device representing the raw disk as specified by
483 * the passed dev_ops. The disk layer not only returns such a raw device,
484 * it also uses it internally when passing (modified) commands through.
335dda38 485 */
b13267a5 486cdev_t
a688b15c 487disk_create(int unit, struct disk *dp, struct dev_ops *raw_ops)
984263bc 488{
be755ff9 489 lwkt_tokref ilock;
b13267a5 490 cdev_t rawdev;
e4c9c0c8 491
8c05caab
AH
492 disk_debug(1,
493 "disk_create (begin): %s%d\n",
494 raw_ops->head.name, unit);
495
cd29885a 496 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit),
e4c9c0c8 497 UID_ROOT, GID_OPERATOR, 0640,
fef8985e 498 "%s%d", raw_ops->head.name, unit);
984263bc 499
cd29885a 500 bzero(dp, sizeof(*dp));
fef8985e 501
e4c9c0c8 502 dp->d_rawdev = rawdev;
fef8985e 503 dp->d_raw_ops = raw_ops;
cd29885a 504 dp->d_dev_ops = &disk_ops;
b17f0c0d 505 dp->d_cdev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
5350e1e9 506 dkmakewholedisk(unit),
e4c9c0c8 507 UID_ROOT, GID_OPERATOR, 0640,
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508 "%s%d", raw_ops->head.name, unit);
509
510 dp->d_cdev->si_disk = dp;
511
be755ff9 512 lwkt_gettoken(&ilock, &disklist_token);
984263bc 513 LIST_INSERT_HEAD(&disklist, dp, d_list);
be755ff9 514 lwkt_reltoken(&ilock);
8c05caab
AH
515
516 disk_debug(1,
517 "disk_create (end): %s%d\n",
518 raw_ops->head.name, unit);
519
e4c9c0c8 520 return (dp->d_rawdev);
984263bc
MD
521}
522
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523
524static void
525_setdiskinfo(struct disk *disk, struct disk_info *info)
a688b15c 526{
55230951
MD
527 char *oldserialno;
528
55230951 529 oldserialno = disk->d_info.d_serialno;
a688b15c
MD
530 bcopy(info, &disk->d_info, sizeof(disk->d_info));
531 info = &disk->d_info;
532
8c05caab
AH
533 disk_debug(1,
534 "_setdiskinfo: %s\n",
535 disk->d_cdev->si_name);
536
55230951
MD
537 /*
538 * The serial number is duplicated so the caller can throw
539 * their copy away.
540 */
541 if (info->d_serialno && info->d_serialno[0]) {
542 info->d_serialno = kstrdup(info->d_serialno, M_TEMP);
fbbbca99 543 disk_cleanserial(info->d_serialno);
55230951
MD
544 if (disk->d_cdev) {
545 make_dev_alias(disk->d_cdev, "serno/%s",
546 info->d_serialno);
547 }
548 } else {
549 info->d_serialno = NULL;
550 }
551 if (oldserialno)
552 kfree(oldserialno, M_TEMP);
553
554 /*
555 * The caller may set d_media_size or d_media_blocks and we
556 * calculate the other.
557 */
a688b15c
MD
558 KKASSERT(info->d_media_size == 0 || info->d_media_blksize == 0);
559 if (info->d_media_size == 0 && info->d_media_blocks) {
d7d5e114 560 info->d_media_size = (u_int64_t)info->d_media_blocks *
a688b15c 561 info->d_media_blksize;
d7d5e114 562 } else if (info->d_media_size && info->d_media_blocks == 0 &&
a688b15c 563 info->d_media_blksize) {
d7d5e114 564 info->d_media_blocks = info->d_media_size /
a688b15c
MD
565 info->d_media_blksize;
566 }
5d6c6885
MD
567
568 /*
569 * The si_* fields for rawdev are not set until after the
570 * disk_create() call, so someone using the cooked version
571 * of the raw device (i.e. da0s0) will not get the right
572 * si_iosize_max unless we fix it up here.
573 */
574 if (disk->d_cdev && disk->d_rawdev &&
575 disk->d_cdev->si_iosize_max == 0) {
576 disk->d_cdev->si_iosize_max = disk->d_rawdev->si_iosize_max;
577 disk->d_cdev->si_bsize_phys = disk->d_rawdev->si_bsize_phys;
578 disk->d_cdev->si_bsize_best = disk->d_rawdev->si_bsize_best;
579 }
aec8eea4 580}
cd29885a 581
aec8eea4
MD
582/*
583 * Disk drivers must call this routine when media parameters are available
584 * or have changed.
585 */
586void
587disk_setdiskinfo(struct disk *disk, struct disk_info *info)
588{
589 _setdiskinfo(disk, info);
cd29885a 590 disk_msg_send(DISK_DISK_PROBE, disk, NULL);
8c05caab
AH
591 disk_debug(1,
592 "disk_setdiskinfo: sent probe for %s\n",
593 disk->d_cdev->si_name);
a688b15c
MD
594}
595
aec8eea4
MD
596void
597disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info)
598{
599 _setdiskinfo(disk, info);
aec8eea4 600 disk_msg_send_sync(DISK_DISK_PROBE, disk, NULL);
8c05caab
AH
601 disk_debug(1,
602 "disk_setdiskinfo_sync: sent probe for %s\n",
603 disk->d_cdev->si_name);
aec8eea4
MD
604}
605
a688b15c 606/*
e4c9c0c8
MD
607 * This routine is called when an adapter detaches. The higher level
608 * managed disk device is destroyed while the lower level raw device is
609 * released.
610 */
335dda38
MD
611void
612disk_destroy(struct disk *disk)
613{
aec8eea4 614 disk_msg_send_sync(DISK_DISK_DESTROY, disk, NULL);
cd29885a 615 return;
335dda38
MD
616}
617
984263bc 618int
e0fc5693 619disk_dumpcheck(cdev_t dev, u_int64_t *count, u_int64_t *blkno, u_int *secsize)
984263bc 620{
a6c0f342
MD
621 struct partinfo pinfo;
622 int error;
984263bc 623
a6c0f342 624 bzero(&pinfo, sizeof(pinfo));
87baaf0c
MD
625 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0,
626 proc0.p_ucred, NULL);
a6c0f342
MD
627 if (error)
628 return (error);
629 if (pinfo.media_blksize == 0)
984263bc 630 return (ENXIO);
a6c0f342 631 *count = (u_int64_t)Maxmem * PAGE_SIZE / pinfo.media_blksize;
1c3c151b 632 if (dumplo64 < pinfo.reserved_blocks ||
a6c0f342
MD
633 dumplo64 + *count > pinfo.media_blocks) {
634 return (ENOSPC);
635 }
636 *blkno = dumplo64 + pinfo.media_offset / pinfo.media_blksize;
637 *secsize = pinfo.media_blksize;
984263bc 638 return (0);
984263bc
MD
639}
640
aec8eea4
MD
641void
642disk_unprobe(struct disk *disk)
643{
644 if (disk == NULL)
645 return;
646
647 disk_msg_send_sync(DISK_UNPROBE, disk, NULL);
648}
649
d7d5e114 650void
984263bc
MD
651disk_invalidate (struct disk *disk)
652{
653 if (disk->d_slice)
654 dsgone(&disk->d_slice);
655}
656
984263bc
MD
657struct disk *
658disk_enumerate(struct disk *disk)
659{
be755ff9
AH
660 struct disk *dp;
661 lwkt_tokref ilock;
662
663 lwkt_gettoken(&ilock, &disklist_token);
984263bc 664 if (!disk)
be755ff9 665 dp = (LIST_FIRST(&disklist));
984263bc 666 else
be755ff9
AH
667 dp = (LIST_NEXT(disk, d_list));
668 lwkt_reltoken(&ilock);
669
670 return dp;
984263bc
MD
671}
672
d7d5e114 673static
fbda7fa6 674int
984263bc
MD
675sysctl_disks(SYSCTL_HANDLER_ARGS)
676{
677 struct disk *disk;
678 int error, first;
679
680 disk = NULL;
681 first = 1;
682
683 while ((disk = disk_enumerate(disk))) {
684 if (!first) {
685 error = SYSCTL_OUT(req, " ", 1);
686 if (error)
687 return error;
688 } else {
689 first = 0;
690 }
95ce4036
HP
691 error = SYSCTL_OUT(req, disk->d_rawdev->si_name,
692 strlen(disk->d_rawdev->si_name));
984263bc
MD
693 if (error)
694 return error;
695 }
696 error = SYSCTL_OUT(req, "", 1);
697 return error;
698}
d7d5e114 699
3641b7ca 700SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
984263bc
MD
701 sysctl_disks, "A", "names of available disks");
702
703/*
e4c9c0c8
MD
704 * Open a disk device or partition.
705 */
fbda7fa6
MD
706static
707int
fef8985e 708diskopen(struct dev_open_args *ap)
984263bc 709{
b13267a5 710 cdev_t dev = ap->a_head.a_dev;
984263bc
MD
711 struct disk *dp;
712 int error;
713
e4c9c0c8
MD
714 /*
715 * dp can't be NULL here XXX.
7ba1363d
MD
716 *
717 * d_slice will be NULL if setdiskinfo() has not been called yet.
718 * setdiskinfo() is typically called whether the disk is present
719 * or not (e.g. CD), but the base disk device is created first
720 * and there may be a race.
e4c9c0c8 721 */
e4c9c0c8 722 dp = dev->si_disk;
7ba1363d 723 if (dp == NULL || dp->d_slice == NULL)
984263bc 724 return (ENXIO);
fef8985e 725 error = 0;
984263bc 726
e4c9c0c8
MD
727 /*
728 * Deal with open races
729 */
984263bc
MD
730 while (dp->d_flags & DISKFLAG_LOCK) {
731 dp->d_flags |= DISKFLAG_WANTED;
377d4740 732 error = tsleep(dp, PCATCH, "diskopen", hz);
984263bc
MD
733 if (error)
734 return (error);
735 }
736 dp->d_flags |= DISKFLAG_LOCK;
737
e4c9c0c8
MD
738 /*
739 * Open the underlying raw device.
740 */
984263bc 741 if (!dsisopen(dp->d_slice)) {
e4c9c0c8 742#if 0
984263bc
MD
743 if (!pdev->si_iosize_max)
744 pdev->si_iosize_max = dev->si_iosize_max;
e4c9c0c8 745#endif
fef8985e
MD
746 error = dev_dopen(dp->d_rawdev, ap->a_oflags,
747 ap->a_devtype, ap->a_cred);
984263bc 748 }
cd29885a 749#if 0
e4c9c0c8
MD
750 /*
751 * Inherit properties from the underlying device now that it is
752 * open.
753 */
fef8985e 754 dev_dclone(dev);
cd29885a 755#endif
984263bc
MD
756
757 if (error)
758 goto out;
a688b15c 759 error = dsopen(dev, ap->a_devtype, dp->d_info.d_dsflags,
84f8b009 760 &dp->d_slice, &dp->d_info);
cd29885a 761 if (!dsisopen(dp->d_slice)) {
fef8985e 762 dev_dclose(dp->d_rawdev, ap->a_oflags, ap->a_devtype);
cd29885a 763 }
d7d5e114 764out:
984263bc
MD
765 dp->d_flags &= ~DISKFLAG_LOCK;
766 if (dp->d_flags & DISKFLAG_WANTED) {
767 dp->d_flags &= ~DISKFLAG_WANTED;
768 wakeup(dp);
769 }
d7d5e114 770
984263bc
MD
771 return(error);
772}
773
e4c9c0c8
MD
774/*
775 * Close a disk device or partition
776 */
fbda7fa6
MD
777static
778int
fef8985e 779diskclose(struct dev_close_args *ap)
984263bc 780{
b13267a5 781 cdev_t dev = ap->a_head.a_dev;
984263bc
MD
782 struct disk *dp;
783 int error;
984263bc
MD
784
785 error = 0;
e4c9c0c8
MD
786 dp = dev->si_disk;
787
fef8985e 788 dsclose(dev, ap->a_devtype, dp->d_slice);
cd29885a 789 if (!dsisopen(dp->d_slice)) {
fef8985e 790 error = dev_dclose(dp->d_rawdev, ap->a_fflag, ap->a_devtype);
cd29885a 791 }
fef8985e
MD
792 return (error);
793}
794
795/*
d7d5e114 796 * First execute the ioctl on the disk device, and if it isn't supported
fef8985e
MD
797 * try running it on the backing device.
798 */
799static
800int
801diskioctl(struct dev_ioctl_args *ap)
802{
b13267a5 803 cdev_t dev = ap->a_head.a_dev;
fef8985e
MD
804 struct disk *dp;
805 int error;
806
807 dp = dev->si_disk;
808 if (dp == NULL)
809 return (ENXIO);
cd29885a 810
149e86b9
MD
811 devfs_debug(DEVFS_DEBUG_DEBUG,
812 "diskioctl: cmd is: %x (name: %s)\n",
813 ap->a_cmd, dev->si_name);
814 devfs_debug(DEVFS_DEBUG_DEBUG,
815 "diskioctl: &dp->d_slice is: %x, %x\n",
816 &dp->d_slice, dp->d_slice);
cd29885a 817
84f8b009
MD
818 error = dsioctl(dev, ap->a_cmd, ap->a_data, ap->a_fflag,
819 &dp->d_slice, &dp->d_info);
cd29885a 820
fef8985e
MD
821 if (error == ENOIOCTL) {
822 error = dev_dioctl(dp->d_rawdev, ap->a_cmd, ap->a_data,
87baaf0c 823 ap->a_fflag, ap->a_cred, NULL);
fef8985e 824 }
984263bc
MD
825 return (error);
826}
827
e4c9c0c8
MD
828/*
829 * Execute strategy routine
830 */
fbda7fa6 831static
fef8985e
MD
832int
833diskstrategy(struct dev_strategy_args *ap)
984263bc 834{
b13267a5 835 cdev_t dev = ap->a_head.a_dev;
fef8985e 836 struct bio *bio = ap->a_bio;
81b5c339 837 struct bio *nbio;
984263bc
MD
838 struct disk *dp;
839
81b5c339 840 dp = dev->si_disk;
984263bc 841
e4c9c0c8 842 if (dp == NULL) {
81b5c339
MD
843 bio->bio_buf->b_error = ENXIO;
844 bio->bio_buf->b_flags |= B_ERROR;
845 biodone(bio);
fef8985e 846 return(0);
984263bc 847 }
81b5c339 848 KKASSERT(dev->si_disk == dp);
984263bc 849
6f76c57e
HP
850 /*
851 * The dscheck() function will also transform the slice relative
54078292 852 * block number i.e. bio->bio_offset into a block number that can be
9a71d53f
MD
853 * passed directly to the underlying raw device. If dscheck()
854 * returns NULL it will have handled the bio for us (e.g. EOF
855 * or error due to being beyond the device size).
6f76c57e 856 */
cd29885a 857 if ((nbio = dscheck(dev, bio, dp->d_slice)) != NULL) {
9a71d53f 858 dev_dstrategy(dp->d_rawdev, nbio);
cd29885a 859 } else {
81b5c339 860 biodone(bio);
cd29885a 861 }
fef8985e 862 return(0);
984263bc
MD
863}
864
335dda38 865/*
fef8985e 866 * Return the partition size in ?blocks?
335dda38 867 */
fbda7fa6
MD
868static
869int
fef8985e 870diskpsize(struct dev_psize_args *ap)
984263bc 871{
b13267a5 872 cdev_t dev = ap->a_head.a_dev;
984263bc 873 struct disk *dp;
984263bc 874
e4c9c0c8
MD
875 dp = dev->si_disk;
876 if (dp == NULL)
fef8985e
MD
877 return(ENODEV);
878 ap->a_result = dssize(dev, &dp->d_slice);
879 return(0);
984263bc
MD
880}
881
e4c9c0c8 882/*
fef8985e
MD
883 * When new device entries are instantiated, make sure they inherit our
884 * si_disk structure and block and iosize limits from the raw device.
e4c9c0c8 885 *
d7d5e114 886 * This routine is always called synchronously in the context of the
fef8985e
MD
887 * client.
888 *
889 * XXX The various io and block size constraints are not always initialized
890 * properly by devices.
e4c9c0c8 891 */
fbda7fa6
MD
892static
893int
fef8985e 894diskclone(struct dev_clone_args *ap)
984263bc 895{
b13267a5 896 cdev_t dev = ap->a_head.a_dev;
984263bc 897 struct disk *dp;
aec8eea4
MD
898 dp = dev->si_disk;
899
fef8985e
MD
900 KKASSERT(dp != NULL);
901 dev->si_disk = dp;
902 dev->si_iosize_max = dp->d_rawdev->si_iosize_max;
903 dev->si_bsize_phys = dp->d_rawdev->si_bsize_phys;
904 dev->si_bsize_best = dp->d_rawdev->si_bsize_best;
905 return(0);
906}
907
908int
909diskdump(struct dev_dump_args *ap)
910{
b13267a5 911 cdev_t dev = ap->a_head.a_dev;
aec8eea4 912 struct disk *dp = dev->si_disk;
fef8985e
MD
913 int error;
914
915 error = disk_dumpcheck(dev, &ap->a_count, &ap->a_blkno, &ap->a_secsize);
916 if (error == 0) {
917 ap->a_head.a_dev = dp->d_rawdev;
918 error = dev_doperate(&ap->a_head);
984263bc 919 }
fef8985e
MD
920
921 return(error);
984263bc
MD
922}
923
fef8985e 924
d7d5e114 925SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
984263bc
MD
926 0, sizeof(struct diskslices), "sizeof(struct diskslices)");
927
d7d5e114 928SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
984263bc 929 0, sizeof(struct disk), "sizeof(struct disk)");
7a9e53ad 930
ef548879 931/*
4afeea0d
MD
932 * Reorder interval for burst write allowance and minor write
933 * allowance.
934 *
935 * We always want to trickle some writes in to make use of the
936 * disk's zone cache. Bursting occurs on a longer interval and only
937 * runningbufspace is well over the hirunningspace limit.
ef548879 938 */
4afeea0d
MD
939int bioq_reorder_burst_interval = 60; /* should be multiple of minor */
940SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_interval,
941 CTLFLAG_RW, &bioq_reorder_burst_interval, 0, "");
942int bioq_reorder_minor_interval = 5;
943SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_interval,
944 CTLFLAG_RW, &bioq_reorder_minor_interval, 0, "");
945
946int bioq_reorder_burst_bytes = 3000000;
947SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_bytes,
948 CTLFLAG_RW, &bioq_reorder_burst_bytes, 0, "");
949int bioq_reorder_minor_bytes = 262144;
950SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_bytes,
951 CTLFLAG_RW, &bioq_reorder_minor_bytes, 0, "");
ef548879 952
7a9e53ad
MD
953
954/*
30e5862e
MD
955 * Order I/Os. Generally speaking this code is designed to make better
956 * use of drive zone caches. A drive zone cache can typically track linear
957 * reads or writes for around 16 zones simultaniously.
7a9e53ad 958 *
30e5862e
MD
959 * Read prioritization issues: It is possible for hundreds of megabytes worth
960 * of writes to be queued asynchronously. This creates a huge bottleneck
961 * for reads which reduce read bandwidth to a trickle.
7a9e53ad 962 *
4afeea0d
MD
963 * To solve this problem we generally reorder reads before writes.
964 *
965 * However, a large number of random reads can also starve writes and
966 * make poor use of the drive zone cache so we allow writes to trickle
967 * in every N reads.
7a9e53ad
MD
968 */
969void
81b5c339 970bioqdisksort(struct bio_queue_head *bioq, struct bio *bio)
7a9e53ad 971{
4afeea0d
MD
972 /*
973 * The BIO wants to be ordered. Adding to the tail also
974 * causes transition to be set to NULL, forcing the ordering
975 * of all prior I/O's.
976 */
977 if (bio->bio_buf->b_flags & B_ORDERED) {
978 bioq_insert_tail(bioq, bio);
979 return;
980 }
981
30e5862e
MD
982 switch(bio->bio_buf->b_cmd) {
983 case BUF_CMD_READ:
984 if (bioq->transition) {
7a9e53ad 985 /*
4afeea0d
MD
986 * Insert before the first write. Bleedover writes
987 * based on reorder intervals to prevent starvation.
7a9e53ad 988 */
30e5862e 989 TAILQ_INSERT_BEFORE(bioq->transition, bio, bio_act);
4afeea0d
MD
990 ++bioq->reorder;
991 if (bioq->reorder % bioq_reorder_minor_interval == 0) {
30e5862e 992 bioqwritereorder(bioq);
4afeea0d
MD
993 if (bioq->reorder >=
994 bioq_reorder_burst_interval) {
995 bioq->reorder = 0;
996 }
7a9e53ad
MD
997 }
998 } else {
7a9e53ad 999 /*
30e5862e
MD
1000 * No writes queued (or ordering was forced),
1001 * insert at tail.
7a9e53ad 1002 */
30e5862e 1003 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
7a9e53ad 1004 }
30e5862e
MD
1005 break;
1006 case BUF_CMD_WRITE:
1007 /*
1008 * Writes are always appended. If no writes were previously
1009 * queued or an ordered tail insertion occured the transition
1010 * field will be NULL.
1011 */
1012 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1013 if (bioq->transition == NULL)
1014 bioq->transition = bio;
1015 break;
1016 default:
1017 /*
1018 * All other request types are forced to be ordered.
1019 */
1020 bioq_insert_tail(bioq, bio);
4afeea0d 1021 break;
7a9e53ad 1022 }
30e5862e 1023}
7a9e53ad 1024
30e5862e 1025/*
4afeea0d
MD
1026 * Move the read-write transition point to prevent reads from
1027 * completely starving our writes. This brings a number of writes into
30e5862e 1028 * the fold every N reads.
4afeea0d
MD
1029 *
1030 * We bring a few linear writes into the fold on a minor interval
1031 * and we bring a non-linear burst of writes into the fold on a major
1032 * interval. Bursting only occurs if runningbufspace is really high
1033 * (typically from syncs, fsyncs, or HAMMER flushes).
30e5862e
MD
1034 */
1035static
1036void
1037bioqwritereorder(struct bio_queue_head *bioq)
1038{
1039 struct bio *bio;
1040 off_t next_offset;
4afeea0d 1041 size_t left;
30e5862e 1042 size_t n;
4afeea0d
MD
1043 int check_off;
1044
1045 if (bioq->reorder < bioq_reorder_burst_interval ||
1046 !buf_runningbufspace_severe()) {
1047 left = (size_t)bioq_reorder_minor_bytes;
1048 check_off = 1;
1049 } else {
1050 left = (size_t)bioq_reorder_burst_bytes;
1051 check_off = 0;
1052 }
30e5862e
MD
1053
1054 next_offset = bioq->transition->bio_offset;
1055 while ((bio = bioq->transition) != NULL &&
4afeea0d
MD
1056 (check_off == 0 || next_offset == bio->bio_offset)
1057 ) {
30e5862e
MD
1058 n = bio->bio_buf->b_bcount;
1059 next_offset = bio->bio_offset + n;
1060 bioq->transition = TAILQ_NEXT(bio, bio_act);
1061 if (left < n)
7a9e53ad 1062 break;
30e5862e 1063 left -= n;
7a9e53ad 1064 }
7a9e53ad
MD
1065}
1066
7a9e53ad
MD
1067/*
1068 * Disk error is the preface to plaintive error messages
1069 * about failing disk transfers. It prints messages of the form
1070
1071hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
1072
1073 * if the offset of the error in the transfer and a disk label
1074 * are both available. blkdone should be -1 if the position of the error
1075 * is unknown; the disklabel pointer may be null from drivers that have not
6ea70f76 1076 * been converted to use them. The message is printed with kprintf
7a9e53ad 1077 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
6ea70f76 1078 * The message should be completed (with at least a newline) with kprintf
a0a36cfd 1079 * or log(-1, ...), respectively. There is no trailing space.
7a9e53ad
MD
1080 */
1081void
a688b15c 1082diskerr(struct bio *bio, cdev_t dev, const char *what, int pri, int donecnt)
7a9e53ad 1083{
81b5c339 1084 struct buf *bp = bio->bio_buf;
c6f49b01
MD
1085 const char *term;
1086
1087 switch(bp->b_cmd) {
1088 case BUF_CMD_READ:
1089 term = "read";
1090 break;
1091 case BUF_CMD_WRITE:
1092 term = "write";
1093 break;
1094 default:
1095 term = "access";
1096 break;
1097 }
cd29885a 1098 kprintf("%s: %s %sing ", dev->si_name, what, term);
973c11b9
MD
1099 kprintf("offset %012llx for %d",
1100 (long long)bio->bio_offset,
1101 bp->b_bcount);
cd29885a 1102
54078292 1103 if (donecnt)
6ea70f76 1104 kprintf(" (%d bytes completed)", donecnt);
7a9e53ad 1105}
81b5c339 1106
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1107/*
1108 * Locate a disk device
1109 */
1110cdev_t
1111disk_locate(const char *devname)
1112{
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1113 return devfs_find_device_by_name(devname);
1114}
a8873631 1115
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1116void
1117disk_config(void *arg)
1118{
aec8eea4 1119 disk_msg_send_sync(DISK_SYNC, NULL, NULL);
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1120}
1121
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1122static void
1123disk_init(void)
1124{
1125 struct thread* td_core;
cd29885a 1126
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1127 disk_msg_cache = objcache_create("disk-msg-cache", 0, 0,
1128 NULL, NULL, NULL,
1129 objcache_malloc_alloc,
1130 objcache_malloc_free,
1131 &disk_msg_malloc_args);
cd29885a 1132
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1133 lwkt_token_init(&disklist_token);
1134
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1135 /*
1136 * Initialize the reply-only port which acts as a message drain
1137 */
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1138 lwkt_initport_replyonly(&disk_dispose_port, disk_msg_autofree_reply);
1139
1140 lwkt_create(disk_msg_core, /*args*/NULL, &td_core, NULL,
1141 0, 0, "disk_msg_core");
1142
1143 tsleep(td_core, 0, "diskcore", 0);
1144}
1145
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1146static void
1147disk_uninit(void)
1148{
cd29885a 1149 objcache_destroy(disk_msg_cache);
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1150}
1151
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1152/*
1153 * Clean out illegal characters in serial numbers.
1154 */
1155static void
1156disk_cleanserial(char *serno)
1157{
1158 char c;
1159
1160 while ((c = *serno) != 0) {
1161 if (c >= 'a' && c <= 'z')
1162 ;
1163 else if (c >= 'A' && c <= 'Z')
1164 ;
1165 else if (c >= '0' && c <= '9')
1166 ;
1167 else if (c == '-' || c == '@' || c == '+' || c == '.')
1168 ;
1169 else
1170 c = '_';
1171 *serno++= c;
1172 }
1173}
1174
8c05caab
AH
1175TUNABLE_INT("kern.disk_debug", &disk_debug_enable);
1176SYSCTL_INT(_kern, OID_AUTO, disk_debug, CTLFLAG_RW, &disk_debug_enable,
1177 0, "Enable subr_disk debugging");
1178
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1179SYSINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, disk_init, NULL);
1180SYSUNINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, disk_uninit, NULL);