@@ -85,6 +85,7 @@ struct svc_serv {
char * sv_name; /* service name */
unsigned int sv_nrpools; /* number of thread pools */
+ bool sv_is_pooled; /* is this a pooled service? */
struct svc_pool * sv_pools; /* array of thread pools */
int (*sv_threadfn)(void *data);
@@ -250,10 +250,8 @@ svc_pool_map_get(void)
int npools = -1;
mutex_lock(&svc_pool_map_mutex);
-
if (m->count++) {
mutex_unlock(&svc_pool_map_mutex);
- WARN_ON_ONCE(m->npools <= 1);
return m->npools;
}
@@ -275,32 +273,21 @@ svc_pool_map_get(void)
m->mode = SVC_POOL_GLOBAL;
}
m->npools = npools;
-
- if (npools == 1)
- /* service is unpooled, so doesn't hold a reference */
- m->count--;
-
mutex_unlock(&svc_pool_map_mutex);
return npools;
}
/*
- * Drop a reference to the global map of cpus to pools, if
- * pools were in use, i.e. if npools > 1.
+ * Drop a reference to the global map of cpus to pools.
* When the last reference is dropped, the map data is
- * freed; this allows the sysadmin to change the pool
- * mode using the pool_mode module option without
- * rebooting or re-loading sunrpc.ko.
+ * freed; this allows the sysadmin to change the pool.
*/
static void
-svc_pool_map_put(int npools)
+svc_pool_map_put(void)
{
struct svc_pool_map *m = &svc_pool_map;
- if (npools <= 1)
- return;
mutex_lock(&svc_pool_map_mutex);
-
if (!--m->count) {
kfree(m->to_pool);
m->to_pool = NULL;
@@ -308,7 +295,6 @@ svc_pool_map_put(int npools)
m->pool_to = NULL;
m->npools = 0;
}
-
mutex_unlock(&svc_pool_map_mutex);
}
@@ -553,9 +539,10 @@ struct svc_serv *svc_create_pooled(struct svc_program *prog,
serv = __svc_create(prog, stats, bufsize, npools, threadfn);
if (!serv)
goto out_err;
+ serv->sv_is_pooled = true;
return serv;
out_err:
- svc_pool_map_put(npools);
+ svc_pool_map_put();
return NULL;
}
EXPORT_SYMBOL_GPL(svc_create_pooled);
@@ -585,7 +572,8 @@ svc_destroy(struct svc_serv **servp)
cache_clean_deferred(serv);
- svc_pool_map_put(serv->sv_nrpools);
+ if (serv->sv_is_pooled)
+ svc_pool_map_put();
for (i = 0; i < serv->sv_nrpools; i++) {
struct svc_pool *pool = &serv->sv_pools[i];
Only pooled services take a reference to the svc_pool_map. The sunrpc code has always used the sv_nrpools value to detect whether the service is pooled. The problem there is that nfsd is a pooled service, but when it's running in "global" pool_mode, it doesn't take a reference to the pool map because it has a sv_nrpools value of 1. This means that we have two separate codepaths for starting the server, depending on whether it's pooled or not. Fix this by adding a new flag to the svc_serv, that indicates whether the serv is pooled. With this we can have the nfsd service unconditionally take a reference, regardless of pool_mode. Ideally we should prevent anyone from changing the pool mode while the server is running, and nfsd does this if the server is in percpu or pernode mode. Previously, you could change the pool_mode even if there were nfsd's already running in "global" mode. This fixes that problem as well. Signed-off-by: Jeff Layton <jlayton@kernel.org> --- include/linux/sunrpc/svc.h | 1 + net/sunrpc/svc.c | 26 +++++++------------------- 2 files changed, 8 insertions(+), 19 deletions(-)