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Improve the micro "disk" layer after gaining more experience with it.

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This commit is contained in:
Poul-Henning Kamp 1999-09-01 05:38:09 +00:00
parent de5f40afa6
commit 8684f73af8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=50728
3 changed files with 75 additions and 20 deletions
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3
sys/contrib/dev/fla/fla.c
View File

@ -299,7 +299,6 @@ flaattach (device_t dev)
struct fla_s *sc;
unit = device_get_unit(dev);
sc = &softc[unit];
error = doc2k_open(unit);
@ -340,7 +339,7 @@ flaattach (device_t dev)
DEVSTAT_NO_ORDERED_TAGS,
DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER, 0x190);
sc->dev = disk_create(unit, &sc->disk, &fla_cdevsw);
sc->dev = disk_create(unit, &sc->disk, 0, &fla_cdevsw);
sc->dev->si_drv1 = sc;
sc->unit = unit;

86
sys/kern/subr_disk.c
View File

@ -17,6 +17,8 @@
#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");
@ -49,22 +51,22 @@ static struct cdevsw disk_cdevsw = {
};
dev_t
disk_create(int unit, struct disk *dp, struct cdevsw *cdevsw)
disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw)
{
dev_t dev;
struct cdevsw *cds;
dp->d_devsw = cdevsw;
dev = makedev(cdevsw->d_maj, 0);
cds = devsw(dev);
if (!cds) {
/* Build the "real" cdevsw */
MALLOC(cds, struct cdevsw *, sizeof(*cds), M_DISK, M_WAITOK);
*cds = disk_cdevsw;
cds->d_name = dp->d_devsw->d_name;
cds->d_maj = dp->d_devsw->d_maj;
cds->d_bmaj = dp->d_devsw->d_bmaj;
cds->d_flags = dp->d_devsw->d_flags;
cds->d_name = cdevsw->d_name;
cds->d_maj = cdevsw->d_maj;
cds->d_bmaj = cdevsw->d_bmaj;
cds->d_flags = cdevsw->d_flags & ~D_TRACKCLOSE;
cds->d_dump = cdevsw->d_dump;
cdevsw_add(cds);
}
@ -73,17 +75,57 @@ disk_create(int unit, struct disk *dp, struct cdevsw *cdevsw)
dev = make_dev(cds, dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART),
0, 0, 0, "r%s%d", cds->d_name, unit);
bzero(dp, sizeof(*dp));
dp->d_devsw = cdevsw;
dev->si_disk = dp;
dp->d_dev = dev;
dp->d_flags = flags;
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)
{
@ -91,24 +133,28 @@ diskopen(dev_t dev, int oflags, int devtype, struct proc *p)
struct disk *dp;
int error;
error = 0;
pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
dp = pdev->si_disk;
dev->si_disk = pdev->si_disk;
dev->si_drv1 = pdev->si_drv1;
dev->si_drv2 = pdev->si_drv2;
if (!dp)
return (ENXIO);
dev->si_disk = dp;
if (!dp->d_opencount++) {
dev->si_drv1 = pdev->si_drv1;
dev->si_drv2 = pdev->si_drv2;
if (!dsisopen(dp->d_slice))
error = dp->d_devsw->d_open(dev, oflags, devtype, p);
if (error)
return(error);
}
error = dsopen(dev, devtype, 0, &dp->d_slice, &dp->d_label);
if (error)
return(error);
error = dsopen(dev, devtype, dp->d_flags, &dp->d_slice, &dp->d_label);
if (error && !--dp->d_opencount)
if (!dsisopen(dp->d_slice))
dp->d_devsw->d_close(dev, oflags, devtype, p);
return(error);
}
@ -121,7 +167,7 @@ diskclose(dev_t dev, int fflag, int devtype, struct proc *p)
error = 0;
dp = dev->si_disk;
dsclose(dev, devtype, dp->d_slice);
if (!--dp->d_opencount)
if (dsisopen(dp->d_slice))
error = dp->d_devsw->d_close(dev, fflag, devtype, p);
return (error);
}
@ -177,7 +223,15 @@ 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));
}

6
sys/sys/disk.h
View File

@ -22,14 +22,16 @@
#endif /* _SYS_DISKLABEL */
struct disk {
int d_opencount;
int d_flags;
struct cdevsw *d_devsw;
dev_t d_dev;
struct diskslices *d_slice;
struct disklabel d_label;
};
dev_t disk_create __P((int unit, struct disk *disk, struct cdevsw *cdevsw));
dev_t disk_create __P((int unit, struct disk *disk, int flags, struct cdevsw *cdevsw));
void disk_delete __P((dev_t dev));
int disk_dumpcheck __P((dev_t dev, u_int *count, u_int *blkno, u_int *secsize));
void disk_invalidate __P((struct disk *disk));
#endif /* _SYS_DISK_H_ */