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domains: allow domains to be unloaded

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Add domain_remove() SYSUNINT callback that removes the domain
 from the domain list if it has DOMF_UNLOADABLE flag set.
This change is required to support netlink ( D36002 ).

Reviewed by:	glebius
Differential Revision: https://reviews.freebsd.org/D36173
This commit is contained in:
Alexander V. Chernikov 2022-08-12 13:36:53 +00:00
parent 278d080bad
commit 9b967bd65d
2 changed files with 27 additions and 0 deletions
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23
sys/kern/uipc_domain.c
View File

@ -239,6 +239,29 @@ domain_add(void *data)
mtx_unlock(&dom_mtx);
}
void
domain_remove(void *data)
{
struct domain *dp = (struct domain *)data;
if ((dp->dom_flags & DOMF_UNLOADABLE) == 0)
return;
mtx_lock(&dom_mtx);
if (domains == dp) {
domains = dp->dom_next;
} else {
struct domain *curr;
for (curr = domains; curr != NULL; curr = curr->dom_next) {
if (curr->dom_next == dp) {
curr->dom_next = dp->dom_next;
break;
}
}
}
mtx_unlock(&dom_mtx);
}
/* ARGSUSED*/
static void
domaininit(void *dummy)

4
sys/sys/domain.h
View File

@ -71,11 +71,13 @@ struct domain {
/* dom_flags */
#define DOMF_SUPPORTED 0x0001 /* System supports this domain. */
#define DOMF_INITED 0x0002 /* Initialized in the default vnet. */
#define DOMF_UNLOADABLE 0x0004 /* Can be unloaded */
#ifdef _KERNEL
extern int domain_init_status;
extern struct domain *domains;
void domain_add(void *);
void domain_remove(void *);
void domain_init(void *);
#ifdef VIMAGE
void vnet_domain_init(void *);
@ -85,6 +87,8 @@ void vnet_domain_uninit(void *);
#define DOMAIN_SET(name) \
SYSINIT(domain_add_ ## name, SI_SUB_PROTO_DOMAIN, \
SI_ORDER_FIRST, domain_add, & name ## domain); \
SYSUNINIT(domain_remove_ ## name, SI_SUB_PROTO_DOMAIN, \
SI_ORDER_FIRST, domain_remove, & name ## domain); \
SYSINIT(domain_init_ ## name, SI_SUB_PROTO_DOMAIN, \
SI_ORDER_SECOND, domain_init, & name ## domain);
#endif /* _KERNEL */