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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 <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <machine/md_var.h>
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;
dev_t
disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto)
{
dev_t dev;
bzero(dp, sizeof(*dp));
dev = makedev(cdevsw->d_maj, 0);
if (!devsw(dev)) {
*proto = *cdevsw;
proto->d_open = diskopen;
proto->d_close = diskclose;
proto->d_ioctl = diskioctl;
proto->d_strategy = diskstrategy;
proto->d_psize = diskpsize;
cdevsw_add(proto);
}
printf("Creating DISK %s%d\n", cdevsw->d_name, unit);
dev = make_dev(proto, dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART),
0, 0, 0, "r%s%d", cdevsw->d_name, unit);
dev->si_disk = dp;
dp->d_dev = dev;
dp->d_flags = flags;
dp->d_devsw = cdevsw;
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 = (u_long)Maxmem * PAGE_SIZE / dl->d_secsize;
if (dumplo < 0 ||
(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)
{
dsgone(&disk->d_slice);
}
void
disk_delete(dev_t dev)
{
return;
}
/*
* The cdevsw functions
*/
static int
diskopen(dev_t dev, int oflags, int devtype, struct proc *p)
{
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);
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, p);
}
/* Inherit properties from the whole/raw dev_t */
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;
if (error)
return(error);
error = dsopen(dev, devtype, dp->d_flags, &dp->d_slice, &dp->d_label);
if (!dsisopen(dp->d_slice))
dp->d_devsw->d_close(pdev, oflags, devtype, p);
return(error);
}
static int
diskclose(dev_t dev, int fflag, int devtype, struct proc *p)
{
struct disk *dp;
int error;
error = 0;
dp = dev->si_disk;
dsclose(dev, devtype, dp->d_slice);
if (!dsisopen(dp->d_slice)) {
error = dp->d_devsw->d_close(dp->d_dev, fflag, devtype, p);
}
return (error);
}
static void
diskstrategy(struct buf *bp)
{
dev_t pdev;
struct disk *dp;
dp = bp->b_dev->si_disk;
if (!dp) {
pdev = dkmodpart(dkmodslice(bp->b_dev, WHOLE_DISK_SLICE), RAW_PART);
dp = bp->b_dev->si_disk = pdev->si_disk;
bp->b_dev->si_drv1 = pdev->si_drv1;
bp->b_dev->si_drv2 = pdev->si_drv2;
bp->b_dev->si_iosize_max = pdev->si_iosize_max;
bp->b_dev->si_bsize_phys = pdev->si_bsize_phys;
bp->b_dev->si_bsize_best = pdev->si_bsize_best;
}
if (!dp) {
bp->b_error = ENXIO;
bp->b_flags |= B_ERROR;
biodone(bp);
return;
}
if (dscheck(bp, dp->d_slice) < 0) {
biodone(bp);
return;
}
dp->d_devsw->d_strategy(bp);
return;
}
static int
diskioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct proc *p)
{
struct disk *dp;
int error;
dp = dev->si_disk;
error = dsioctl(dev, cmd, data, fflag, &dp->d_slice);
if (error == ENOIOCTL)
error = dp->d_devsw->d_ioctl(dev, cmd, data, fflag, p);
return (error);
}
static int
diskpsize(dev_t dev)
{
struct disk *dp;
dev_t pdev;
dp = dev->si_disk;
if (!dp) {
pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
dp = pdev->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_DECL(_debug_sizeof);
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)");
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