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Allow shared open of /dev/fwmem* for read-only.

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This commit is contained in:
simokawa 2003-11-07 12:39:39 +00:00
parent 8c5c585444
commit 78a182b242
1 changed files with 42 additions and 16 deletions
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58
sys/dev/firewire/fwmem.c
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@ -56,6 +56,7 @@ __FBSDID("$FreeBSD$");
#include <sys/signal.h>
#include <sys/mman.h>
#include <sys/ioccom.h>
#include <sys/fcntl.h>
#include <dev/firewire/firewire.h>
#include <dev/firewire/firewirereg.h>
@ -77,6 +78,11 @@ SYSCTL_INT(_debug, OID_AUTO, fwmem_debug, CTLFLAG_RW, &fwmem_debug, 0,
#define MAXLEN (512 << fwmem_speed)
struct fwmem_softc {
struct fw_eui64 eui;
int refcount;
};
static struct fw_xfer *
fwmem_xfer_req(
struct fw_device *fwdev,
@ -260,18 +266,25 @@ fwmem_write_block(
int
fwmem_open (dev_t dev, int flags, int fmt, fw_proc *td)
{
struct fw_eui64 *eui;
struct fwmem_softc *fms;
if (dev->si_drv1 != NULL)
return (EBUSY);
eui = (struct fw_eui64 *)malloc(sizeof(struct fw_eui64),
if (dev->si_drv1 != NULL) {
if ((flags & FWRITE) != 0)
return (EBUSY);
fms = (struct fwmem_softc *)dev->si_drv1;
fms->refcount ++;
} else {
fms = (struct fwmem_softc *)malloc(sizeof(struct fwmem_softc),
M_FW, M_WAITOK);
if (eui == NULL)
return ENOMEM;
bcopy(&fwmem_eui64, eui, sizeof(struct fw_eui64));
dev->si_drv1 = (void *)eui;
dev->si_iosize_max = DFLTPHYS;
if (fms == NULL)
return ENOMEM;
bcopy(&fwmem_eui64, &fms->eui, sizeof(struct fw_eui64));
dev->si_drv1 = (void *)fms;
dev->si_iosize_max = DFLTPHYS;
fms->refcount = 1;
}
if (fwmem_debug)
printf("%s: refcount=%d\n", __FUNCTION__, fms->refcount);
return (0);
}
@ -279,8 +292,16 @@ fwmem_open (dev_t dev, int flags, int fmt, fw_proc *td)
int
fwmem_close (dev_t dev, int flags, int fmt, fw_proc *td)
{
free(dev->si_drv1, M_FW);
dev->si_drv1 = NULL;
struct fwmem_softc *fms;
fms = (struct fwmem_softc *)dev->si_drv1;
fms->refcount --;
if (fwmem_debug)
printf("%s: refcount=%d\n", __FUNCTION__, fms->refcount);
if (fms->refcount < 1) {
free(dev->si_drv1, M_FW);
dev->si_drv1 = NULL;
}
return (0);
}
@ -309,6 +330,7 @@ void
fwmem_strategy(struct bio *bp)
{
struct firewire_softc *sc;
struct fwmem_softc *fms;
struct fw_device *fwdev;
struct fw_xfer *xfer;
dev_t dev;
@ -321,11 +343,12 @@ fwmem_strategy(struct bio *bp)
sc = devclass_get_softc(firewire_devclass, unit);
s = splfw();
fwdev = fw_noderesolve_eui64(sc->fc, (struct fw_eui64 *)dev->si_drv1);
fms = (struct fwmem_softc *)dev->si_drv1;
fwdev = fw_noderesolve_eui64(sc->fc, &fms->eui);
if (fwdev == NULL) {
if (fwmem_debug)
printf("fwmem: no such device ID:%08x%08x\n",
fwmem_eui64.hi, fwmem_eui64.lo);
fms->eui.hi, fms->eui.lo);
err = EINVAL;
goto error;
}
@ -375,13 +398,16 @@ fwmem_strategy(struct bio *bp)
int
fwmem_ioctl (dev_t dev, u_long cmd, caddr_t data, int flag, fw_proc *td)
{
struct fwmem_softc *fms;
int err = 0;
fms = (struct fwmem_softc *)dev->si_drv1;
switch (cmd) {
case FW_SDEUI64:
bcopy(data, dev->si_drv1, sizeof(struct fw_eui64));
bcopy(data, &fms->eui, sizeof(struct fw_eui64));
break;
case FW_GDEUI64:
bcopy(dev->si_drv1, data, sizeof(struct fw_eui64));
bcopy(&fms->eui, data, sizeof(struct fw_eui64));
break;
default:
err = EINVAL;