2 * Copyright (c) 2003,2004,2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
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 * ----------------------------------------------------------------------------
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.
49 * Redistribution and use in source and binary forms, with or without
50 * modification, are permitted provided that the following conditions
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.
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
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 $
80 * $DragonFly: src/sys/kern/subr_disk.c,v 1.40 2008/06/05 18:06:32 swildner Exp $
83 #include <sys/param.h>
84 #include <sys/systm.h>
85 #include <sys/kernel.h>
87 #include <sys/sysctl.h>
90 #include <sys/disklabel.h>
91 #include <sys/disklabel32.h>
92 #include <sys/disklabel64.h>
93 #include <sys/diskslice.h>
94 #include <sys/diskmbr.h>
96 #include <sys/kerneldump.h>
97 #include <sys/malloc.h>
98 #include <sys/sysctl.h>
99 #include <machine/md_var.h>
100 #include <sys/ctype.h>
101 #include <sys/syslog.h>
102 #include <sys/device.h>
103 #include <sys/msgport.h>
104 #include <sys/msgport2.h>
105 #include <sys/buf2.h>
106 #include <sys/devfs.h>
107 #include <sys/thread.h>
108 #include <sys/thread2.h>
110 #include <sys/queue.h>
111 #include <sys/lock.h>
113 static MALLOC_DEFINE(M_DISK
, "disk", "disk data");
114 static int disk_debug_enable
= 0;
116 static void disk_msg_autofree_reply(lwkt_port_t
, lwkt_msg_t
);
117 static void disk_msg_core(void *);
118 static int disk_probe_slice(struct disk
*dp
, cdev_t dev
, int slice
, int reprobe
);
119 static void disk_probe(struct disk
*dp
, int reprobe
);
120 static void _setdiskinfo(struct disk
*disk
, struct disk_info
*info
);
121 static void bioqwritereorder(struct bio_queue_head
*bioq
);
122 static void disk_cleanserial(char *serno
);
124 static d_open_t diskopen
;
125 static d_close_t diskclose
;
126 static d_ioctl_t diskioctl
;
127 static d_strategy_t diskstrategy
;
128 static d_psize_t diskpsize
;
129 static d_clone_t diskclone
;
130 static d_dump_t diskdump
;
132 static LIST_HEAD(, disk
) disklist
= LIST_HEAD_INITIALIZER(&disklist
);
133 static struct lwkt_token disklist_token
;
135 static struct dev_ops disk_ops
= {
136 { "disk", 0, D_DISK
},
138 .d_close
= diskclose
,
140 .d_write
= physwrite
,
141 .d_ioctl
= diskioctl
,
142 .d_strategy
= diskstrategy
,
144 .d_psize
= diskpsize
,
148 static struct objcache
*disk_msg_cache
;
150 struct objcache_malloc_args disk_msg_malloc_args
= {
151 sizeof(struct disk_msg
), M_DISK
};
153 static struct lwkt_port disk_dispose_port
;
154 static struct lwkt_port disk_msg_port
;
157 disk_debug(int level
, char *fmt
, ...)
162 if (level
<= disk_debug_enable
)
170 disk_probe_slice(struct disk
*dp
, cdev_t dev
, int slice
, int reprobe
)
172 struct disk_info
*info
= &dp
->d_info
;
173 struct diskslice
*sp
= &dp
->d_slice
->dss_slices
[slice
];
175 struct partinfo part
;
182 "disk_probe_slice (begin): %s (%s)\n",
183 dev
->si_name
, dp
->d_cdev
->si_name
);
185 sno
= slice
? slice
- 1 : 0;
187 ops
= &disklabel32_ops
;
188 msg
= ops
->op_readdisklabel(dev
, sp
, &sp
->ds_label
, info
);
189 if (msg
&& !strcmp(msg
, "no disk label")) {
190 ops
= &disklabel64_ops
;
191 msg
= ops
->op_readdisklabel(dev
, sp
, &sp
->ds_label
, info
);
194 if (slice
!= WHOLE_DISK_SLICE
)
195 ops
->op_adjust_label_reserved(dp
->d_slice
, slice
, sp
);
200 for (i
= 0; i
< ops
->op_getnumparts(sp
->ds_label
); i
++) {
201 ops
->op_loadpartinfo(sp
->ds_label
, i
, &part
);
204 (ndev
= devfs_find_device_by_name("%s%c",
205 dev
->si_name
, 'a' + i
))
208 * Device already exists and
211 ndev
->si_flags
|= SI_REPROBE_TEST
;
213 ndev
= make_dev_covering(&disk_ops
, dp
->d_rawdev
->si_ops
,
214 dkmakeminor(dkunit(dp
->d_cdev
),
216 UID_ROOT
, GID_OPERATOR
, 0640,
217 "%s%c", dev
->si_name
, 'a'+ i
);
219 if (dp
->d_info
.d_serialno
) {
222 dp
->d_info
.d_serialno
,
225 ndev
->si_flags
|= SI_REPROBE_TEST
;
229 } else if (info
->d_dsflags
& DSO_COMPATLABEL
) {
231 if (sp
->ds_size
>= 0x100000000ULL
)
232 ops
= &disklabel64_ops
;
234 ops
= &disklabel32_ops
;
235 sp
->ds_label
= ops
->op_clone_label(info
, sp
);
237 if (sp
->ds_type
== DOSPTYP_386BSD
|| /* XXX */
238 sp
->ds_type
== DOSPTYP_NETBSD
||
239 sp
->ds_type
== DOSPTYP_OPENBSD
) {
240 log(LOG_WARNING
, "%s: cannot find label (%s)\n",
246 sp
->ds_wlabel
= FALSE
;
249 return (msg
? EINVAL
: 0);
254 disk_probe(struct disk
*dp
, int reprobe
)
256 struct disk_info
*info
= &dp
->d_info
;
257 cdev_t dev
= dp
->d_cdev
;
260 struct diskslice
*sp
;
262 KKASSERT (info
->d_media_blksize
!= 0);
264 dp
->d_slice
= dsmakeslicestruct(BASE_SLICE
, info
);
266 "disk_probe (begin): %s\n",
267 dp
->d_cdev
->si_name
);
269 error
= mbrinit(dev
, info
, &(dp
->d_slice
));
273 for (i
= 0; i
< dp
->d_slice
->dss_nslices
; i
++) {
275 * Ignore the whole-disk slice, it has already been created.
277 if (i
== WHOLE_DISK_SLICE
)
279 sp
= &dp
->d_slice
->dss_slices
[i
];
282 * Handle s0. s0 is a compatibility slice if there are no
283 * other slices and it has not otherwise been set up, else
286 if (i
== COMPATIBILITY_SLICE
) {
288 if (sp
->ds_type
== 0 &&
289 dp
->d_slice
->dss_nslices
== BASE_SLICE
) {
290 sp
->ds_size
= info
->d_media_blocks
;
299 * Ignore 0-length slices
301 if (sp
->ds_size
== 0)
305 (ndev
= devfs_find_device_by_name("%ss%d",
306 dev
->si_name
, sno
))) {
308 * Device already exists and is still valid
310 ndev
->si_flags
|= SI_REPROBE_TEST
;
313 * Else create new device
315 ndev
= make_dev_covering(&disk_ops
, dp
->d_rawdev
->si_ops
,
316 dkmakewholeslice(dkunit(dev
), i
),
317 UID_ROOT
, GID_OPERATOR
, 0640,
318 "%ss%d", dev
->si_name
, sno
);
319 if (dp
->d_info
.d_serialno
) {
320 make_dev_alias(ndev
, "serno/%s.s%d",
321 dp
->d_info
.d_serialno
, sno
);
324 ndev
->si_flags
|= SI_REPROBE_TEST
;
329 * Probe appropriate slices for a disklabel
331 * XXX slice type 1 used by our gpt probe code.
332 * XXX slice type 0 used by mbr compat slice.
334 if (sp
->ds_type
== DOSPTYP_386BSD
||
335 sp
->ds_type
== DOSPTYP_NETBSD
||
336 sp
->ds_type
== DOSPTYP_OPENBSD
||
339 if (dp
->d_slice
->dss_first_bsd_slice
== 0)
340 dp
->d_slice
->dss_first_bsd_slice
= i
;
341 disk_probe_slice(dp
, ndev
, i
, reprobe
);
345 "disk_probe (end): %s\n",
346 dp
->d_cdev
->si_name
);
351 disk_msg_core(void *arg
)
354 struct diskslice
*sp
;
359 lwkt_initport_thread(&disk_msg_port
, curthread
);
364 msg
= (disk_msg_t
)lwkt_waitport(&disk_msg_port
, 0);
366 switch (msg
->hdr
.u
.ms_result
) {
367 case DISK_DISK_PROBE
:
368 dp
= (struct disk
*)msg
->load
;
370 "DISK_DISK_PROBE: %s\n",
371 dp
->d_cdev
->si_name
);
374 case DISK_DISK_DESTROY
:
375 dp
= (struct disk
*)msg
->load
;
377 "DISK_DISK_DESTROY: %s\n",
378 dp
->d_cdev
->si_name
);
379 devfs_destroy_subnames(dp
->d_cdev
->si_name
);
380 devfs_destroy_dev(dp
->d_cdev
);
381 lwkt_gettoken(&ilock
, &disklist_token
);
382 LIST_REMOVE(dp
, d_list
);
383 lwkt_reltoken(&ilock
);
384 if (dp
->d_info
.d_serialno
) {
385 kfree(dp
->d_info
.d_serialno
, M_TEMP
);
386 dp
->d_info
.d_serialno
= NULL
;
390 dp
= (struct disk
*)msg
->load
;
392 "DISK_DISK_UNPROBE: %s\n",
393 dp
->d_cdev
->si_name
);
394 devfs_destroy_subnames(dp
->d_cdev
->si_name
);
396 case DISK_SLICE_REPROBE
:
397 dp
= (struct disk
*)msg
->load
;
398 sp
= (struct diskslice
*)msg
->load2
;
399 devfs_clr_subnames_flag(sp
->ds_dev
->si_name
,
402 "DISK_SLICE_REPROBE: %s\n",
403 sp
->ds_dev
->si_name
);
404 disk_probe_slice(dp
, sp
->ds_dev
,
405 dkslice(sp
->ds_dev
), 1);
406 devfs_destroy_subnames_without_flag(
407 sp
->ds_dev
->si_name
, SI_REPROBE_TEST
);
409 case DISK_DISK_REPROBE
:
410 dp
= (struct disk
*)msg
->load
;
411 devfs_clr_subnames_flag(dp
->d_cdev
->si_name
, SI_REPROBE_TEST
);
413 "DISK_DISK_REPROBE: %s\n",
414 dp
->d_cdev
->si_name
);
416 devfs_destroy_subnames_without_flag(
417 dp
->d_cdev
->si_name
, SI_REPROBE_TEST
);
420 disk_debug(1, "DISK_SYNC\n");
423 devfs_debug(DEVFS_DEBUG_WARNING
,
424 "disk_msg_core: unknown message "
425 "received at core\n");
428 lwkt_replymsg(&msg
->hdr
, 0);
435 * Acts as a message drain. Any message that is replied to here gets
436 * destroyed and the memory freed.
439 disk_msg_autofree_reply(lwkt_port_t port
, lwkt_msg_t msg
)
441 objcache_put(disk_msg_cache
, msg
);
446 disk_msg_send(uint32_t cmd
, void *load
, void *load2
)
449 lwkt_port_t port
= &disk_msg_port
;
451 disk_msg
= objcache_get(disk_msg_cache
, M_WAITOK
);
453 lwkt_initmsg(&disk_msg
->hdr
, &disk_dispose_port
, 0);
455 disk_msg
->hdr
.u
.ms_result
= cmd
;
456 disk_msg
->load
= load
;
457 disk_msg
->load2
= load2
;
459 lwkt_sendmsg(port
, &disk_msg
->hdr
);
463 disk_msg_send_sync(uint32_t cmd
, void *load
, void *load2
)
465 struct lwkt_port rep_port
;
469 disk_msg
= objcache_get(disk_msg_cache
, M_WAITOK
);
470 port
= &disk_msg_port
;
472 /* XXX could probably use curthread's built-in msgport */
473 lwkt_initport_thread(&rep_port
, curthread
);
474 lwkt_initmsg(&disk_msg
->hdr
, &rep_port
, 0);
476 disk_msg
->hdr
.u
.ms_result
= cmd
;
477 disk_msg
->load
= load
;
478 disk_msg
->load2
= load2
;
480 lwkt_sendmsg(port
, &disk_msg
->hdr
);
481 lwkt_waitmsg(&disk_msg
->hdr
, 0);
482 objcache_put(disk_msg_cache
, disk_msg
);
486 * Create a raw device for the dev_ops template (which is returned). Also
487 * create a slice and unit managed disk and overload the user visible
488 * device space with it.
490 * NOTE: The returned raw device is NOT a slice and unit managed device.
491 * It is an actual raw device representing the raw disk as specified by
492 * the passed dev_ops. The disk layer not only returns such a raw device,
493 * it also uses it internally when passing (modified) commands through.
496 disk_create(int unit
, struct disk
*dp
, struct dev_ops
*raw_ops
)
502 "disk_create (begin): %s%d\n",
503 raw_ops
->head
.name
, unit
);
505 rawdev
= make_only_dev(raw_ops
, dkmakewholedisk(unit
),
506 UID_ROOT
, GID_OPERATOR
, 0640,
507 "%s%d", raw_ops
->head
.name
, unit
);
509 bzero(dp
, sizeof(*dp
));
511 dp
->d_rawdev
= rawdev
;
512 dp
->d_raw_ops
= raw_ops
;
513 dp
->d_dev_ops
= &disk_ops
;
514 dp
->d_cdev
= make_dev_covering(&disk_ops
, dp
->d_rawdev
->si_ops
,
515 dkmakewholedisk(unit
),
516 UID_ROOT
, GID_OPERATOR
, 0640,
517 "%s%d", raw_ops
->head
.name
, unit
);
519 dp
->d_cdev
->si_disk
= dp
;
521 lwkt_gettoken(&ilock
, &disklist_token
);
522 LIST_INSERT_HEAD(&disklist
, dp
, d_list
);
523 lwkt_reltoken(&ilock
);
526 "disk_create (end): %s%d\n",
527 raw_ops
->head
.name
, unit
);
529 return (dp
->d_rawdev
);
534 _setdiskinfo(struct disk
*disk
, struct disk_info
*info
)
538 oldserialno
= disk
->d_info
.d_serialno
;
539 bcopy(info
, &disk
->d_info
, sizeof(disk
->d_info
));
540 info
= &disk
->d_info
;
543 "_setdiskinfo: %s\n",
544 disk
->d_cdev
->si_name
);
547 * The serial number is duplicated so the caller can throw
550 if (info
->d_serialno
&& info
->d_serialno
[0]) {
551 info
->d_serialno
= kstrdup(info
->d_serialno
, M_TEMP
);
552 disk_cleanserial(info
->d_serialno
);
554 make_dev_alias(disk
->d_cdev
, "serno/%s",
558 info
->d_serialno
= NULL
;
561 kfree(oldserialno
, M_TEMP
);
564 * The caller may set d_media_size or d_media_blocks and we
565 * calculate the other.
567 KKASSERT(info
->d_media_size
== 0 || info
->d_media_blksize
== 0);
568 if (info
->d_media_size
== 0 && info
->d_media_blocks
) {
569 info
->d_media_size
= (u_int64_t
)info
->d_media_blocks
*
570 info
->d_media_blksize
;
571 } else if (info
->d_media_size
&& info
->d_media_blocks
== 0 &&
572 info
->d_media_blksize
) {
573 info
->d_media_blocks
= info
->d_media_size
/
574 info
->d_media_blksize
;
578 * The si_* fields for rawdev are not set until after the
579 * disk_create() call, so someone using the cooked version
580 * of the raw device (i.e. da0s0) will not get the right
581 * si_iosize_max unless we fix it up here.
583 if (disk
->d_cdev
&& disk
->d_rawdev
&&
584 disk
->d_cdev
->si_iosize_max
== 0) {
585 disk
->d_cdev
->si_iosize_max
= disk
->d_rawdev
->si_iosize_max
;
586 disk
->d_cdev
->si_bsize_phys
= disk
->d_rawdev
->si_bsize_phys
;
587 disk
->d_cdev
->si_bsize_best
= disk
->d_rawdev
->si_bsize_best
;
592 * Disk drivers must call this routine when media parameters are available
596 disk_setdiskinfo(struct disk
*disk
, struct disk_info
*info
)
598 _setdiskinfo(disk
, info
);
599 disk_msg_send(DISK_DISK_PROBE
, disk
, NULL
);
601 "disk_setdiskinfo: sent probe for %s\n",
602 disk
->d_cdev
->si_name
);
606 disk_setdiskinfo_sync(struct disk
*disk
, struct disk_info
*info
)
608 _setdiskinfo(disk
, info
);
609 disk_msg_send_sync(DISK_DISK_PROBE
, disk
, NULL
);
611 "disk_setdiskinfo_sync: sent probe for %s\n",
612 disk
->d_cdev
->si_name
);
616 * This routine is called when an adapter detaches. The higher level
617 * managed disk device is destroyed while the lower level raw device is
621 disk_destroy(struct disk
*disk
)
623 disk_msg_send_sync(DISK_DISK_DESTROY
, disk
, NULL
);
628 disk_dumpcheck(cdev_t dev
, u_int64_t
*size
, u_int64_t
*blkno
, u_int32_t
*secsize
)
630 struct partinfo pinfo
;
633 bzero(&pinfo
, sizeof(pinfo
));
634 error
= dev_dioctl(dev
, DIOCGPART
, (void *)&pinfo
, 0,
635 proc0
.p_ucred
, NULL
);
639 if (pinfo
.media_blksize
== 0)
642 if (blkno
) /* XXX: make sure this reserved stuff is right */
643 *blkno
= pinfo
.reserved_blocks
+
644 pinfo
.media_offset
/ pinfo
.media_blksize
;
646 *secsize
= pinfo
.media_blksize
;
648 *size
= (pinfo
.media_blocks
- pinfo
.reserved_blocks
);
654 disk_dumpconf(cdev_t dev
, u_int onoff
)
656 struct dumperinfo di
;
657 u_int64_t size
, blkno
;
662 return set_dumper(NULL
);
664 error
= disk_dumpcheck(dev
, &size
, &blkno
, &secsize
);
669 bzero(&di
, sizeof(struct dumperinfo
));
670 di
.dumper
= diskdump
;
672 di
.blocksize
= secsize
;
673 di
.mediaoffset
= blkno
* DEV_BSIZE
;
674 di
.mediasize
= size
* DEV_BSIZE
;
676 return set_dumper(&di
);
680 disk_unprobe(struct disk
*disk
)
685 disk_msg_send_sync(DISK_UNPROBE
, disk
, NULL
);
689 disk_invalidate (struct disk
*disk
)
692 dsgone(&disk
->d_slice
);
696 disk_enumerate(struct disk
*disk
)
701 lwkt_gettoken(&ilock
, &disklist_token
);
703 dp
= (LIST_FIRST(&disklist
));
705 dp
= (LIST_NEXT(disk
, d_list
));
706 lwkt_reltoken(&ilock
);
713 sysctl_disks(SYSCTL_HANDLER_ARGS
)
721 while ((disk
= disk_enumerate(disk
))) {
723 error
= SYSCTL_OUT(req
, " ", 1);
729 error
= SYSCTL_OUT(req
, disk
->d_rawdev
->si_name
,
730 strlen(disk
->d_rawdev
->si_name
));
734 error
= SYSCTL_OUT(req
, "", 1);
738 SYSCTL_PROC(_kern
, OID_AUTO
, disks
, CTLTYPE_STRING
| CTLFLAG_RD
, NULL
, 0,
739 sysctl_disks
, "A", "names of available disks");
742 * Open a disk device or partition.
746 diskopen(struct dev_open_args
*ap
)
748 cdev_t dev
= ap
->a_head
.a_dev
;
753 * dp can't be NULL here XXX.
755 * d_slice will be NULL if setdiskinfo() has not been called yet.
756 * setdiskinfo() is typically called whether the disk is present
757 * or not (e.g. CD), but the base disk device is created first
758 * and there may be a race.
761 if (dp
== NULL
|| dp
->d_slice
== NULL
)
766 * Deal with open races
768 while (dp
->d_flags
& DISKFLAG_LOCK
) {
769 dp
->d_flags
|= DISKFLAG_WANTED
;
770 error
= tsleep(dp
, PCATCH
, "diskopen", hz
);
774 dp
->d_flags
|= DISKFLAG_LOCK
;
777 * Open the underlying raw device.
779 if (!dsisopen(dp
->d_slice
)) {
781 if (!pdev
->si_iosize_max
)
782 pdev
->si_iosize_max
= dev
->si_iosize_max
;
784 error
= dev_dopen(dp
->d_rawdev
, ap
->a_oflags
,
785 ap
->a_devtype
, ap
->a_cred
);
789 * Inherit properties from the underlying device now that it is
797 error
= dsopen(dev
, ap
->a_devtype
, dp
->d_info
.d_dsflags
,
798 &dp
->d_slice
, &dp
->d_info
);
799 if (!dsisopen(dp
->d_slice
)) {
800 dev_dclose(dp
->d_rawdev
, ap
->a_oflags
, ap
->a_devtype
);
803 dp
->d_flags
&= ~DISKFLAG_LOCK
;
804 if (dp
->d_flags
& DISKFLAG_WANTED
) {
805 dp
->d_flags
&= ~DISKFLAG_WANTED
;
813 * Close a disk device or partition
817 diskclose(struct dev_close_args
*ap
)
819 cdev_t dev
= ap
->a_head
.a_dev
;
826 dsclose(dev
, ap
->a_devtype
, dp
->d_slice
);
827 if (!dsisopen(dp
->d_slice
)) {
828 error
= dev_dclose(dp
->d_rawdev
, ap
->a_fflag
, ap
->a_devtype
);
834 * First execute the ioctl on the disk device, and if it isn't supported
835 * try running it on the backing device.
839 diskioctl(struct dev_ioctl_args
*ap
)
841 cdev_t dev
= ap
->a_head
.a_dev
;
850 devfs_debug(DEVFS_DEBUG_DEBUG
,
851 "diskioctl: cmd is: %x (name: %s)\n",
852 ap
->a_cmd
, dev
->si_name
);
853 devfs_debug(DEVFS_DEBUG_DEBUG
,
854 "diskioctl: &dp->d_slice is: %x, %x\n",
855 &dp
->d_slice
, dp
->d_slice
);
857 if (ap
->a_cmd
== DIOCGKERNELDUMP
) {
858 u
= *(u_int
*)ap
->a_data
;
859 return disk_dumpconf(dev
, u
);
862 error
= dsioctl(dev
, ap
->a_cmd
, ap
->a_data
, ap
->a_fflag
,
863 &dp
->d_slice
, &dp
->d_info
);
865 if (error
== ENOIOCTL
) {
866 error
= dev_dioctl(dp
->d_rawdev
, ap
->a_cmd
, ap
->a_data
,
867 ap
->a_fflag
, ap
->a_cred
, NULL
);
873 * Execute strategy routine
877 diskstrategy(struct dev_strategy_args
*ap
)
879 cdev_t dev
= ap
->a_head
.a_dev
;
880 struct bio
*bio
= ap
->a_bio
;
887 bio
->bio_buf
->b_error
= ENXIO
;
888 bio
->bio_buf
->b_flags
|= B_ERROR
;
892 KKASSERT(dev
->si_disk
== dp
);
895 * The dscheck() function will also transform the slice relative
896 * block number i.e. bio->bio_offset into a block number that can be
897 * passed directly to the underlying raw device. If dscheck()
898 * returns NULL it will have handled the bio for us (e.g. EOF
899 * or error due to being beyond the device size).
901 if ((nbio
= dscheck(dev
, bio
, dp
->d_slice
)) != NULL
) {
902 dev_dstrategy(dp
->d_rawdev
, nbio
);
910 * Return the partition size in ?blocks?
914 diskpsize(struct dev_psize_args
*ap
)
916 cdev_t dev
= ap
->a_head
.a_dev
;
922 ap
->a_result
= dssize(dev
, &dp
->d_slice
);
927 * When new device entries are instantiated, make sure they inherit our
928 * si_disk structure and block and iosize limits from the raw device.
930 * This routine is always called synchronously in the context of the
933 * XXX The various io and block size constraints are not always initialized
934 * properly by devices.
938 diskclone(struct dev_clone_args
*ap
)
940 cdev_t dev
= ap
->a_head
.a_dev
;
944 KKASSERT(dp
!= NULL
);
946 dev
->si_iosize_max
= dp
->d_rawdev
->si_iosize_max
;
947 dev
->si_bsize_phys
= dp
->d_rawdev
->si_bsize_phys
;
948 dev
->si_bsize_best
= dp
->d_rawdev
->si_bsize_best
;
953 diskdump(struct dev_dump_args
*ap
)
955 cdev_t dev
= ap
->a_head
.a_dev
;
956 struct disk
*dp
= dev
->si_disk
;
957 u_int64_t size
, offset
;
960 error
= disk_dumpcheck(dev
, &size
, &ap
->a_blkno
, &ap
->a_secsize
);
961 /* XXX: this should probably go in disk_dumpcheck somehow */
962 if (ap
->a_length
!= 0) {
964 offset
= ap
->a_blkno
* DEV_BSIZE
;
965 if ((ap
->a_offset
< offset
) ||
966 (ap
->a_offset
+ ap
->a_length
- offset
> size
)) {
967 kprintf("Attempt to write outside dump device boundaries.\n");
973 ap
->a_head
.a_dev
= dp
->d_rawdev
;
974 error
= dev_doperate(&ap
->a_head
);
981 SYSCTL_INT(_debug_sizeof
, OID_AUTO
, diskslices
, CTLFLAG_RD
,
982 0, sizeof(struct diskslices
), "sizeof(struct diskslices)");
984 SYSCTL_INT(_debug_sizeof
, OID_AUTO
, disk
, CTLFLAG_RD
,
985 0, sizeof(struct disk
), "sizeof(struct disk)");
988 * Reorder interval for burst write allowance and minor write
991 * We always want to trickle some writes in to make use of the
992 * disk's zone cache. Bursting occurs on a longer interval and only
993 * runningbufspace is well over the hirunningspace limit.
995 int bioq_reorder_burst_interval
= 60; /* should be multiple of minor */
996 SYSCTL_INT(_kern
, OID_AUTO
, bioq_reorder_burst_interval
,
997 CTLFLAG_RW
, &bioq_reorder_burst_interval
, 0, "");
998 int bioq_reorder_minor_interval
= 5;
999 SYSCTL_INT(_kern
, OID_AUTO
, bioq_reorder_minor_interval
,
1000 CTLFLAG_RW
, &bioq_reorder_minor_interval
, 0, "");
1002 int bioq_reorder_burst_bytes
= 3000000;
1003 SYSCTL_INT(_kern
, OID_AUTO
, bioq_reorder_burst_bytes
,
1004 CTLFLAG_RW
, &bioq_reorder_burst_bytes
, 0, "");
1005 int bioq_reorder_minor_bytes
= 262144;
1006 SYSCTL_INT(_kern
, OID_AUTO
, bioq_reorder_minor_bytes
,
1007 CTLFLAG_RW
, &bioq_reorder_minor_bytes
, 0, "");
1011 * Order I/Os. Generally speaking this code is designed to make better
1012 * use of drive zone caches. A drive zone cache can typically track linear
1013 * reads or writes for around 16 zones simultaniously.
1015 * Read prioritization issues: It is possible for hundreds of megabytes worth
1016 * of writes to be queued asynchronously. This creates a huge bottleneck
1017 * for reads which reduce read bandwidth to a trickle.
1019 * To solve this problem we generally reorder reads before writes.
1021 * However, a large number of random reads can also starve writes and
1022 * make poor use of the drive zone cache so we allow writes to trickle
1026 bioqdisksort(struct bio_queue_head
*bioq
, struct bio
*bio
)
1029 * The BIO wants to be ordered. Adding to the tail also
1030 * causes transition to be set to NULL, forcing the ordering
1031 * of all prior I/O's.
1033 if (bio
->bio_buf
->b_flags
& B_ORDERED
) {
1034 bioq_insert_tail(bioq
, bio
);
1038 switch(bio
->bio_buf
->b_cmd
) {
1040 if (bioq
->transition
) {
1042 * Insert before the first write. Bleedover writes
1043 * based on reorder intervals to prevent starvation.
1045 TAILQ_INSERT_BEFORE(bioq
->transition
, bio
, bio_act
);
1047 if (bioq
->reorder
% bioq_reorder_minor_interval
== 0) {
1048 bioqwritereorder(bioq
);
1049 if (bioq
->reorder
>=
1050 bioq_reorder_burst_interval
) {
1056 * No writes queued (or ordering was forced),
1059 TAILQ_INSERT_TAIL(&bioq
->queue
, bio
, bio_act
);
1064 * Writes are always appended. If no writes were previously
1065 * queued or an ordered tail insertion occured the transition
1066 * field will be NULL.
1068 TAILQ_INSERT_TAIL(&bioq
->queue
, bio
, bio_act
);
1069 if (bioq
->transition
== NULL
)
1070 bioq
->transition
= bio
;
1074 * All other request types are forced to be ordered.
1076 bioq_insert_tail(bioq
, bio
);
1082 * Move the read-write transition point to prevent reads from
1083 * completely starving our writes. This brings a number of writes into
1084 * the fold every N reads.
1086 * We bring a few linear writes into the fold on a minor interval
1087 * and we bring a non-linear burst of writes into the fold on a major
1088 * interval. Bursting only occurs if runningbufspace is really high
1089 * (typically from syncs, fsyncs, or HAMMER flushes).
1093 bioqwritereorder(struct bio_queue_head
*bioq
)
1101 if (bioq
->reorder
< bioq_reorder_burst_interval
||
1102 !buf_runningbufspace_severe()) {
1103 left
= (size_t)bioq_reorder_minor_bytes
;
1106 left
= (size_t)bioq_reorder_burst_bytes
;
1110 next_offset
= bioq
->transition
->bio_offset
;
1111 while ((bio
= bioq
->transition
) != NULL
&&
1112 (check_off
== 0 || next_offset
== bio
->bio_offset
)
1114 n
= bio
->bio_buf
->b_bcount
;
1115 next_offset
= bio
->bio_offset
+ n
;
1116 bioq
->transition
= TAILQ_NEXT(bio
, bio_act
);
1124 * Disk error is the preface to plaintive error messages
1125 * about failing disk transfers. It prints messages of the form
1127 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
1129 * if the offset of the error in the transfer and a disk label
1130 * are both available. blkdone should be -1 if the position of the error
1131 * is unknown; the disklabel pointer may be null from drivers that have not
1132 * been converted to use them. The message is printed with kprintf
1133 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
1134 * The message should be completed (with at least a newline) with kprintf
1135 * or log(-1, ...), respectively. There is no trailing space.
1138 diskerr(struct bio
*bio
, cdev_t dev
, const char *what
, int pri
, int donecnt
)
1140 struct buf
*bp
= bio
->bio_buf
;
1154 kprintf("%s: %s %sing ", dev
->si_name
, what
, term
);
1155 kprintf("offset %012llx for %d",
1156 (long long)bio
->bio_offset
,
1160 kprintf(" (%d bytes completed)", donecnt
);
1164 * Locate a disk device
1167 disk_locate(const char *devname
)
1169 return devfs_find_device_by_name(devname
);
1173 disk_config(void *arg
)
1175 disk_msg_send_sync(DISK_SYNC
, NULL
, NULL
);
1181 struct thread
* td_core
;
1183 disk_msg_cache
= objcache_create("disk-msg-cache", 0, 0,
1185 objcache_malloc_alloc
,
1186 objcache_malloc_free
,
1187 &disk_msg_malloc_args
);
1189 lwkt_token_init(&disklist_token
);
1192 * Initialize the reply-only port which acts as a message drain
1194 lwkt_initport_replyonly(&disk_dispose_port
, disk_msg_autofree_reply
);
1196 lwkt_create(disk_msg_core
, /*args*/NULL
, &td_core
, NULL
,
1197 0, 0, "disk_msg_core");
1199 tsleep(td_core
, 0, "diskcore", 0);
1205 objcache_destroy(disk_msg_cache
);
1209 * Clean out illegal characters in serial numbers.
1212 disk_cleanserial(char *serno
)
1216 while ((c
= *serno
) != 0) {
1217 if (c
>= 'a' && c
<= 'z')
1219 else if (c
>= 'A' && c
<= 'Z')
1221 else if (c
>= '0' && c
<= '9')
1223 else if (c
== '-' || c
== '@' || c
== '+' || c
== '.')
1231 TUNABLE_INT("kern.disk_debug", &disk_debug_enable
);
1232 SYSCTL_INT(_kern
, OID_AUTO
, disk_debug
, CTLFLAG_RW
, &disk_debug_enable
,
1233 0, "Enable subr_disk debugging");
1235 SYSINIT(disk_register
, SI_SUB_PRE_DRIVERS
, SI_ORDER_FIRST
, disk_init
, NULL
);
1236 SYSUNINIT(disk_register
, SI_SUB_PRE_DRIVERS
, SI_ORDER_ANY
, disk_uninit
, NULL
);