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cache: provide safe variant of nl_cache_mngt_require() and use it 

This makes runtime removal of cache operations possible if non-safe
API is not in use by application. The non-safe API will be removed
in the next major version.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
This commit is contained in:
Thomas Graf 2012-11-16 01:11:55 +01:00
parent 23c4ef67c7
commit 00132b4696
14 changed files with 75 additions and 26 deletions
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8
include/netlink-local.h
View File

@ -117,14 +117,6 @@ extern int __str2flags(const char *, const struct trans_tbl *, size_t);
extern void dump_from_ops(struct nl_object *, struct nl_dump_params *);
static inline struct nl_cache *dp_cache(struct nl_object *obj)
{
if (obj->ce_cache == NULL)
return nl_cache_mngt_require(obj->ce_ops->oo_name);
return obj->ce_cache;
}
static inline int nl_cb_call(struct nl_cb *cb, int type, struct nl_msg *msg)
{
return cb->cb_set[type](msg, cb->cb_args[type]);

2
include/netlink/cache.h
View File

@ -52,6 +52,7 @@ extern struct nl_cache * nl_cache_clone(struct nl_cache *);
extern void nl_cache_clear(struct nl_cache *);
extern void nl_cache_get(struct nl_cache *);
extern void nl_cache_free(struct nl_cache *);
extern void nl_cache_put(struct nl_cache *cache);
/* Cache modification */
extern int nl_cache_add(struct nl_cache *,
@ -118,6 +119,7 @@ extern int nl_cache_mngt_unregister(struct nl_cache_ops *);
extern void nl_cache_mngt_provide(struct nl_cache *);
extern void nl_cache_mngt_unprovide(struct nl_cache *);
extern struct nl_cache * nl_cache_mngt_require(const char *);
extern struct nl_cache * nl_cache_mngt_require_safe(const char *);
extern struct nl_cache * __nl_cache_mngt_require(const char *);
struct nl_cache_mngr;

5
lib/cache.c
View File

@ -410,6 +410,11 @@ void nl_cache_free(struct nl_cache *cache)
__nl_cache_free(cache);
}
void nl_cache_put(struct nl_cache *cache)
{
return nl_cache_free(cache);
}
/** @} */
/**

32
lib/cache_mngt.c
View File

@ -390,14 +390,15 @@ struct nl_cache *__nl_cache_mngt_require(const char *name)
}
/**
* Demand the use of a global cache
* @arg name name of the required object type
* Return cache previously provided via nl_cache_mngt_provide()
* @arg name Name of cache to lookup
*
* Trys to find a cache of the specified type for global
* use.
* @attention This function is not safe, it does not increment the reference
* counter. Please use nl_cache_mngt_require_safe().
*
* @return A cache provided by another subsystem of the
* specified type marked to be available.
* @see nl_cache_mngt_require_safe()
*
* @return Pointer to cache or NULL if none registered
*/
struct nl_cache *nl_cache_mngt_require(const char *name)
{
@ -412,6 +413,25 @@ struct nl_cache *nl_cache_mngt_require(const char *name)
return cache;
}
/**
* Return cache previously provided via nl_cache_mngt_provide()
* @arg name Name of cache to lookup
*
* @note The reference counter of the returned cache is incremented
* and must be decremented after use with nl_cache_put().
*
* @return Pointer to cache or NULL if none registered
*/
struct nl_cache *nl_cache_mngt_require_safe(const char *name)
{
struct nl_cache *cache;
if ((cache = nl_cache_mngt_require(name)))
nl_cache_get(cache);
return cache;
}
/** @} */
/** @} */

5
lib/netfilter/log_msg_obj.c
View File

@ -76,7 +76,7 @@ static void log_msg_dump(struct nl_object *a, struct nl_dump_params *p)
struct nl_cache *link_cache;
char buf[64];
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
nl_new_line(p);
@ -167,6 +167,9 @@ static void log_msg_dump(struct nl_object *a, struct nl_dump_params *p)
nl_dump(p, "SEQGLOBAL=%d ", msg->log_msg_seq_global);
nl_dump(p, "\n");
if (link_cache)
nl_cache_put(link_cache);
}
/**

5
lib/netfilter/queue_msg_obj.c
View File

@ -66,7 +66,7 @@ static void nfnl_queue_msg_dump(struct nl_object *a, struct nl_dump_params *p)
struct nl_cache *link_cache;
char buf[64];
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
nl_new_line(p);
@ -152,6 +152,9 @@ static void nfnl_queue_msg_dump(struct nl_object *a, struct nl_dump_params *p)
buf, sizeof(buf)));
nl_dump(p, "\n");
if (link_cache)
nl_cache_put(link_cache);
}
/**

5
lib/route/addr.c
View File

@ -332,7 +332,7 @@ static void addr_dump_line(struct nl_object *obj, struct nl_dump_params *p)
struct nl_cache *link_cache;
char buf[128];
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
if (addr->ce_mask & ADDR_ATTR_LOCAL)
nl_dump_line(p, "%s",
@ -361,6 +361,9 @@ static void addr_dump_line(struct nl_object *obj, struct nl_dump_params *p)
nl_dump(p, " <%s>", buf);
nl_dump(p, "\n");
if (link_cache)
nl_cache_put(link_cache);
}
static void addr_dump_details(struct nl_object *obj, struct nl_dump_params *p)

2
lib/route/link.c
View File

@ -581,7 +581,7 @@ static int link_request_update(struct nl_cache *cache, struct nl_sock *sk)
static void link_dump_line(struct nl_object *obj, struct nl_dump_params *p)
{
char buf[128];
struct nl_cache *cache = dp_cache(obj);
struct nl_cache *cache = obj->ce_cache;
struct rtnl_link *link = (struct rtnl_link *) obj;
nl_dump_line(p, "%s %s ", link->l_name,

9
lib/route/neigh.c
View File

@ -401,7 +401,7 @@ int rtnl_neigh_parse(struct nlmsghdr *n, struct rtnl_neigh **result)
* Get the bridge index for AF_BRIDGE family entries
*/
if (neigh->n_family == AF_BRIDGE) {
struct nl_cache *lcache = nl_cache_mngt_require("route/link");
struct nl_cache *lcache = nl_cache_mngt_require_safe("route/link");
if (lcache ) {
struct rtnl_link *link = rtnl_link_get(lcache,
neigh->n_ifindex);
@ -410,6 +410,8 @@ int rtnl_neigh_parse(struct nlmsghdr *n, struct rtnl_neigh **result)
rtnl_link_put(link);
neigh->ce_mask |= NEIGH_ATTR_MASTER;
}
nl_cache_put(lcache);
}
}
@ -436,7 +438,7 @@ static void neigh_dump_line(struct nl_object *a, struct nl_dump_params *p)
struct nl_cache *link_cache;
char state[128], flags[64];
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
if (n->n_family != AF_BRIDGE)
nl_dump_line(p, "%s ", nl_addr2str(n->n_dst, dst, sizeof(dst)));
@ -462,6 +464,9 @@ static void neigh_dump_line(struct nl_object *a, struct nl_dump_params *p)
if (state[0] || flags[0])
nl_dump(p, ">");
nl_dump(p, "\n");
if (link_cache)
nl_cache_put(link_cache);
}
static void neigh_dump_details(struct nl_object *a, struct nl_dump_params *p)

3
lib/route/neightbl.c
View File

@ -237,7 +237,7 @@ static void neightbl_dump_line(struct nl_object *arg, struct nl_dump_params *p)
if (ntbl->nt_parms.ntp_mask & NEIGHTBLPARM_ATTR_IFINDEX) {
struct nl_cache *link_cache;
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
if (link_cache) {
char buf[32];
@ -245,6 +245,7 @@ static void neightbl_dump_line(struct nl_object *arg, struct nl_dump_params *p)
rtnl_link_i2name(link_cache,
ntbl->nt_parms.ntp_ifindex,
buf, sizeof(buf)));
nl_cache_put(link_cache);
} else
nl_dump(p, "<%u> ", ntbl->nt_parms.ntp_ifindex);
} else

10
lib/route/nexthop.c
View File

@ -109,7 +109,7 @@ static void nh_dump_line(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
struct nl_cache *link_cache;
char buf[128];
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
nl_dump(dp, "via");
@ -128,6 +128,9 @@ static void nh_dump_line(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
}
nl_dump(dp, " ");
if (link_cache)
nl_cache_put(link_cache);
}
static void nh_dump_details(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
@ -135,7 +138,7 @@ static void nh_dump_details(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
struct nl_cache *link_cache;
char buf[128];
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
nl_dump(dp, "nexthop");
@ -164,6 +167,9 @@ static void nh_dump_details(struct rtnl_nexthop *nh, struct nl_dump_params *dp)
if (nh->ce_mask & NH_ATTR_FLAGS)
nl_dump(dp, " <%s>", rtnl_route_nh_flags2str(nh->rtnh_flags,
buf, sizeof(buf)));
if (link_cache)
nl_cache_put(link_cache);
}
void rtnl_route_nh_dump(struct rtnl_nexthop *nh, struct nl_dump_params *dp)

5
lib/route/route_obj.c
View File

@ -210,7 +210,7 @@ static void route_dump_details(struct nl_object *a, struct nl_dump_params *p)
char buf[128];
int i;
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
route_dump_line(a, p);
nl_dump_line(p, " ");
@ -271,6 +271,9 @@ static void route_dump_details(struct nl_object *a, struct nl_dump_params *p)
r->rt_metrics[i]);
nl_dump(p, "]\n");
}
if (link_cache)
nl_cache_put(link_cache);
}
static void route_dump_stats(struct nl_object *obj, struct nl_dump_params *p)

5
lib/route/tc.c
View File

@ -822,7 +822,7 @@ void rtnl_tc_dump_line(struct nl_object *obj, struct nl_dump_params *p)
nl_dump(p, "%s ", tc->tc_kind);
if ((link_cache = nl_cache_mngt_require("route/link"))) {
if ((link_cache = nl_cache_mngt_require_safe("route/link"))) {
nl_dump(p, "dev %s ",
rtnl_link_i2name(link_cache, tc->tc_ifindex,
buf, sizeof(buf)));
@ -837,6 +837,9 @@ void rtnl_tc_dump_line(struct nl_object *obj, struct nl_dump_params *p)
tc_dump(tc, NL_DUMP_LINE, p);
nl_dump(p, "\n");
if (link_cache)
nl_cache_put(link_cache);
}
void rtnl_tc_dump_details(struct nl_object *obj, struct nl_dump_params *p)

5
src/nl-addr-list.c
View File

@ -65,7 +65,7 @@ static void env_dump(struct nl_object *obj, void *arg)
nl_addr2str(rtnl_addr_get_local(addr), buf, sizeof(buf)));
nl_dump_line(p, "%s_IFINDEX=%u\n", pfx, rtnl_addr_get_ifindex(addr));
link_cache = nl_cache_mngt_require("route/link");
link_cache = nl_cache_mngt_require_safe("route/link");
if (link_cache)
nl_dump_line(p, "%s_IFNAME=%s\n", pfx,
rtnl_link_i2name(link_cache,
@ -94,6 +94,9 @@ static void env_dump(struct nl_object *obj, void *arg)
nl_dump_line(p, "%s_CACHEINFO_VALID=%u\n", pfx,
rtnl_addr_get_valid_lifetime(addr));
if (link_cache)
nl_cache_put(link_cache);
#if 0
if (addr->ce_mask & ADDR_ATTR_CACHEINFO) {
struct rtnl_addr_cacheinfo *ci = &addr->a_cacheinfo;