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Implement device cloning for /dev/nsmb, the netsmb control pseudo-device.

Browse Source 
The smb library in userspace already knows how to deal with this type of
cloning.

This also corrects a leak in which the netsmb kernel module could not be
unloaded if device nodes had been stat'd but not open'd.

Discussed with:	kib
This commit is contained in:
Robert Watson 2008-11-03 14:23:15 +00:00
parent 45e6ab7f81
commit 339f72c730
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=184592
1 changed files with 19 additions and 7 deletions
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26
sys/netsmb/smb_dev.c
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@ -89,28 +89,38 @@ int smb_dev_queue(struct smb_dev *ndp, struct smb_rq *rqp, int prio);
static struct cdevsw nsmb_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_flags = D_NEEDGIANT | D_NEEDMINOR,
.d_open = nsmb_dev_open,
.d_close = nsmb_dev_close,
.d_ioctl = nsmb_dev_ioctl,
.d_name = NSMB_NAME
};
static eventhandler_tag nsmb_dev_tag;
static eventhandler_tag nsmb_dev_tag;
static struct clonedevs *nsmb_clones;
static void
nsmb_dev_clone(void *arg, struct ucred *cred, char *name, int namelen,
struct cdev **dev)
{
int u;
int i, u;
if (*dev != NULL)
return;
if (dev_stdclone(name, NULL, NSMB_NAME, &u) != 1)
if (strcmp(name, NSMB_NAME) == 0)
u = -1;
else if (dev_stdclone(name, NULL, NSMB_NAME, &u) != 1)
return;
*dev = make_dev(&nsmb_cdevsw, u, 0, 0, 0600,
NSMB_NAME"%d", u);
dev_ref(*dev);
i = clone_create(&nsmb_clones, &nsmb_cdevsw, &u, dev, 0);
if (i) {
*dev = make_dev(&nsmb_cdevsw, u, UID_ROOT, GID_WHEEL, 0600,
"%s%d", NSMB_NAME, u);
if (*dev != NULL) {
dev_ref(*dev);
(*dev)->si_flags |= SI_CHEAPCLONE;
}
}
}
static int
@ -340,6 +350,7 @@ nsmb_dev_load(module_t mod, int cmd, void *arg)
smb_sm_done();
break;
}
clone_setup(&nsmb_clones);
nsmb_dev_tag = EVENTHANDLER_REGISTER(dev_clone, nsmb_dev_clone, 0, 1000);
printf("netsmb_dev: loaded\n");
break;
@ -350,6 +361,7 @@ nsmb_dev_load(module_t mod, int cmd, void *arg)
break;
EVENTHANDLER_DEREGISTER(dev_clone, nsmb_dev_tag);
drain_dev_clone_events();
clone_cleanup(&nsmb_clones);
destroy_dev_drain(&nsmb_cdevsw);
printf("netsmb_dev: unloaded\n");
break;