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freebsd/sys/kern/subr_disk.c

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/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*
*/
#include "opt_geom.h"
#ifndef GEOM
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/bio.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <machine/md_var.h>
#include <sys/ctype.h>
2000-12-08 20:09:00 +00:00
static MALLOC_DEFINE(M_DISK, "disk", "disk data");
static d_strategy_t diskstrategy;
static d_open_t diskopen;
static d_close_t diskclose;
static d_ioctl_t diskioctl;
static d_psize_t diskpsize;
static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
void disk_dev_synth(dev_t dev);
void
disk_dev_synth(dev_t dev)
{
struct disk *dp;
int u, s, p;
dev_t pdev;
if (dksparebits(dev))
return;
LIST_FOREACH(dp, &disklist, d_list) {
if (major(dev) != dp->d_devsw->d_maj)
continue;
u = dkunit(dev);
p = RAW_PART;
s = WHOLE_DISK_SLICE;
pdev = makedev(dp->d_devsw->d_maj, dkmakeminor(u, s, p));
if (pdev->si_devsw == NULL)
return; /* Probably a unit we don't have */
s = dkslice(dev);
p = dkpart(dev);
if (s == WHOLE_DISK_SLICE && p == RAW_PART) {
/* XXX: actually should not happen */
dev = make_dev(pdev->si_devsw, dkmakeminor(u, s, p),
UID_ROOT, GID_OPERATOR, 0640, "%s%d",
dp->d_devsw->d_name, u);
dev_depends(pdev, dev);
return;
}
if (s == COMPATIBILITY_SLICE) {
dev = make_dev(pdev->si_devsw, dkmakeminor(u, s, p),
UID_ROOT, GID_OPERATOR, 0640, "%s%d%c",
dp->d_devsw->d_name, u, 'a' + p);
dev_depends(pdev, dev);
return;
}
if (p != RAW_PART) {
dev = make_dev(pdev->si_devsw, dkmakeminor(u, s, p),
UID_ROOT, GID_OPERATOR, 0640, "%s%ds%d%c",
dp->d_devsw->d_name, u, s - BASE_SLICE + 1,
'a' + p);
} else {
dev = make_dev(pdev->si_devsw, dkmakeminor(u, s, p),
UID_ROOT, GID_OPERATOR, 0640, "%s%ds%d",
dp->d_devsw->d_name, u, s - BASE_SLICE + 1);
make_dev_alias(dev, "%s%ds%dc",
dp->d_devsw->d_name, u, s - BASE_SLICE + 1);
}
dev_depends(pdev, dev);
return;
}
}
static void
disk_clone(void *arg, char *name, int namelen, dev_t *dev)
{
struct disk *dp;
char const *d;
char *e;
int j, u, s, p;
dev_t pdev;
if (*dev != NODEV)
return;
LIST_FOREACH(dp, &disklist, d_list) {
d = dp->d_devsw->d_name;
j = dev_stdclone(name, &e, d, &u);
if (j == 0)
continue;
if (u > DKMAXUNIT)
continue;
p = RAW_PART;
s = WHOLE_DISK_SLICE;
pdev = makedev(dp->d_devsw->d_maj, dkmakeminor(u, s, p));
if (pdev->si_disk == NULL)
continue;
if (*e != '\0') {
j = dev_stdclone(e, &e, "s", &s);
if (j == 0)
s = COMPATIBILITY_SLICE;
else if (j == 1 || j == 2)
s += BASE_SLICE - 1;
if (!*e)
; /* ad0s1 case */
else if (e[1] != '\0')
return; /* can never be a disk name */
else if (*e < 'a' || *e > 'h')
return; /* can never be a disk name */
else
p = *e - 'a';
}
if (s == WHOLE_DISK_SLICE && p == RAW_PART) {
return;
} else if (s >= BASE_SLICE && p != RAW_PART) {
*dev = make_dev(pdev->si_devsw, dkmakeminor(u, s, p),
UID_ROOT, GID_OPERATOR, 0640, "%s%ds%d%c",
pdev->si_devsw->d_name, u, s - BASE_SLICE + 1,
p + 'a');
} else if (s >= BASE_SLICE) {
*dev = make_dev(pdev->si_devsw, dkmakeminor(u, s, p),
UID_ROOT, GID_OPERATOR, 0640, "%s%ds%d",
pdev->si_devsw->d_name, u, s - BASE_SLICE + 1);
make_dev_alias(*dev, "%s%ds%dc",
pdev->si_devsw->d_name, u, s - BASE_SLICE + 1);
} else {
*dev = make_dev(pdev->si_devsw, dkmakeminor(u, s, p),
UID_ROOT, GID_OPERATOR, 0640, "%s%d%c",
pdev->si_devsw->d_name, u, p + 'a');
}
dev_depends(pdev, *dev);
return;
}
}
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
static void
inherit_raw(dev_t pdev, dev_t dev)
{
dev->si_disk = pdev->si_disk;
dev->si_drv1 = pdev->si_drv1;
dev->si_drv2 = pdev->si_drv2;
dev->si_iosize_max = pdev->si_iosize_max;
dev->si_bsize_phys = pdev->si_bsize_phys;
dev->si_bsize_best = pdev->si_bsize_best;
}
dev_t
disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto)
{
static int once;
dev_t dev;
if (!once) {
EVENTHANDLER_REGISTER(dev_clone, disk_clone, 0, 1000);
once++;
}
bzero(dp, sizeof(*dp));
if (proto->d_open != diskopen) {
*proto = *cdevsw;
proto->d_open = diskopen;
proto->d_close = diskclose;
proto->d_ioctl = diskioctl;
proto->d_strategy = diskstrategy;
proto->d_psize = diskpsize;
}
1999-11-19 23:34:01 +00:00
if (bootverbose)
printf("Creating DISK %s%d\n", cdevsw->d_name, unit);
dev = make_dev(proto, dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART),
UID_ROOT, GID_OPERATOR, 0640, "%s%d", cdevsw->d_name, unit);
dev->si_disk = dp;
dp->d_dev = dev;
dp->d_dsflags = flags;
dp->d_devsw = cdevsw;
LIST_INSERT_HEAD(&disklist, dp, d_list);
return (dev);
}
int
disk_dumpcheck(dev_t dev, u_int *count, u_int *blkno, u_int *secsize)
{
struct disk *dp;
struct disklabel *dl;
u_int boff;
dp = dev->si_disk;
if (!dp)
return (ENXIO);
if (!dp->d_slice)
return (ENXIO);
dl = dsgetlabel(dev, dp->d_slice);
if (!dl)
return (ENXIO);
*count = Maxmem * (PAGE_SIZE / dl->d_secsize);
if (dumplo <= LABELSECTOR ||
(dumplo + *count > dl->d_partitions[dkpart(dev)].p_size))
return (EINVAL);
boff = dl->d_partitions[dkpart(dev)].p_offset +
dp->d_slice->dss_slices[dkslice(dev)].ds_offset;
*blkno = boff + dumplo;
*secsize = dl->d_secsize;
return (0);
}
void
disk_invalidate (struct disk *disk)
{
if (disk->d_slice)
dsgone(&disk->d_slice);
}
void
disk_destroy(dev_t dev)
{
LIST_REMOVE(dev->si_disk, d_list);
bzero(dev->si_disk, sizeof(*dev->si_disk));
dev->si_disk = NULL;
destroy_dev(dev);
return;
}
struct disk *
disk_enumerate(struct disk *disk)
{
if (!disk)
return (LIST_FIRST(&disklist));
else
return (LIST_NEXT(disk, d_list));
}
static int
sysctl_disks(SYSCTL_HANDLER_ARGS)
{
struct disk *disk;
int error, first;
disk = NULL;
first = 1;
while ((disk = disk_enumerate(disk))) {
if (!first) {
error = SYSCTL_OUT(req, " ", 1);
if (error)
return error;
} else {
first = 0;
}
error = SYSCTL_OUT(req, disk->d_dev->si_name, strlen(disk->d_dev->si_name));
if (error)
return error;
}
error = SYSCTL_OUT(req, "", 1);
return error;
}
SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, 0, NULL,
sysctl_disks, "A", "names of available disks");
/*
* The cdevsw functions
*/
static int
diskopen(dev_t dev, int oflags, int devtype, struct thread *td)
{
dev_t pdev;
struct disk *dp;
int error;
error = 0;
pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
dp = pdev->si_disk;
if (!dp)
return (ENXIO);
while (dp->d_flags & DISKFLAG_LOCK) {
dp->d_flags |= DISKFLAG_WANTED;
error = tsleep(dp, PRIBIO | PCATCH, "diskopen", hz);
if (error)
return (error);
}
dp->d_flags |= DISKFLAG_LOCK;
if (!dsisopen(dp->d_slice)) {
if (!pdev->si_iosize_max)
pdev->si_iosize_max = dev->si_iosize_max;
error = dp->d_devsw->d_open(pdev, oflags, devtype, td);
}
/* Inherit properties from the whole/raw dev_t */
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
inherit_raw(pdev, dev);
if (error)
goto out;
error = dsopen(dev, devtype, dp->d_dsflags, &dp->d_slice, &dp->d_label);
if (!dsisopen(dp->d_slice))
dp->d_devsw->d_close(pdev, oflags, devtype, td);
out:
dp->d_flags &= ~DISKFLAG_LOCK;
if (dp->d_flags & DISKFLAG_WANTED) {
dp->d_flags &= ~DISKFLAG_WANTED;
wakeup(dp);
}
return(error);
}
static int
diskclose(dev_t dev, int fflag, int devtype, struct thread *td)
{
struct disk *dp;
int error;
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
dev_t pdev;
error = 0;
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
dp = pdev->si_disk;
if (!dp)
return (ENXIO);
dsclose(dev, devtype, dp->d_slice);
if (!dsisopen(dp->d_slice))
error = dp->d_devsw->d_close(dp->d_dev, fflag, devtype, td);
return (error);
}
static void
diskstrategy(struct bio *bp)
{
dev_t pdev;
struct disk *dp;
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
pdev = dkmodpart(dkmodslice(bp->bio_dev, WHOLE_DISK_SLICE), RAW_PART);
dp = pdev->si_disk;
bp->bio_resid = bp->bio_bcount;
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
if (dp != bp->bio_dev->si_disk)
inherit_raw(pdev, bp->bio_dev);
if (!dp) {
biofinish(bp, NULL, ENXIO);
return;
}
if (dscheck(bp, dp->d_slice) <= 0) {
biodone(bp);
return;
}
if (bp->bio_bcount == 0) {
biodone(bp);
return;
}
KASSERT(dp->d_devsw != NULL, ("NULL devsw"));
KASSERT(dp->d_devsw->d_strategy != NULL, ("NULL d_strategy"));
dp->d_devsw->d_strategy(bp);
return;
}
static int
diskioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
struct disk *dp;
int error;
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
dev_t pdev;
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
dp = pdev->si_disk;
if (!dp)
return (ENXIO);
error = dsioctl(dev, cmd, data, fflag, &dp->d_slice);
if (error == ENOIOCTL)
error = dp->d_devsw->d_ioctl(dev, cmd, data, fflag, td);
return (error);
}
static int
diskpsize(dev_t dev)
{
struct disk *dp;
dev_t pdev;
End two weeks of on and off debugging. Fix the crash on the Nth insertion of a CF card, for random values of N > 1. With these fixes, I've been able to do 100 insert/remove of the cards w/o a crash with lots of system activity going on that in the past would help trigger the crash. The problem: FreeBSD creates dev_t's on the fly as they are needed and never destroys them. These dev_t's point to a struct disk that is used for housekeeping on the disk. When a device goes away, the struct disk pointer becomes a dangling pointer. Sometimes when the device comes back, the pointer will point to the new struct disk (in which case the insertion will work). Other times it won't (especially if any length of time has passed, since it is dependent on memory returned from malloc). The Fix: There is one of these dev_t's that is always correct. The device for the WHOLE_DISK_SLICE is always right. It gets set at create_disk() time. So, the fix is to spend a little CPU time and lookup the WHOLE_DISK_SLICE dev_t and use the si_disk from that in preference to the one that's in the device asking to do the I/O. In addition, we change the test of si_disk == NULL meaning that the dev needed to inherit properties from the pdev to dev->si_disk != pdev->si_disk. This test is a little stronger than the previous test, but can sometimes be fooled into not inheriting. However, the results of this fooling are that the old values will be used, which will generally always be the same as before. si_drv[12] are the only values that are copied that might pose a problem. They tend to change as the si_disk field would change, so it is a hole, but it is a small hole. One could correctly argue that one should replace much of this code with something much much better. I would be on the pro side of that argument. Reviewed by: phk (who also ported the original patch to current) Sponsored by: Timing Solutions
2000-07-05 06:01:33 +00:00
pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
dp = pdev->si_disk;
if (!dp)
return (-1);
if (dp != dev->si_disk) {
dev->si_drv1 = pdev->si_drv1;
dev->si_drv2 = pdev->si_drv2;
/* XXX: don't set bp->b_dev->si_disk (?) */
}
return (dssize(dev, &dp->d_slice));
}
SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD,
0, sizeof(struct disklabel), "sizeof(struct disklabel)");
SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
0, sizeof(struct diskslices), "sizeof(struct diskslices)");
SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
0, sizeof(struct disk), "sizeof(struct disk)");
#endif