nfsd: fix startup order in nfsd_reply_cache_init
Jeff Layton [Fri, 15 Mar 2013 13:16:29 +0000 (09:16 -0400)]
If we end up doing "goto out_nomem" in this function, we'll call
nfsd_reply_cache_shutdown. That will attempt to walk the LRU list and
free entries, but that list may not be initialized yet if the server is
starting up for the first time. It's also possible for the shrinker to
kick in before we've initialized the LRU list.

Rearrange the initialization so that the LRU list_head and cache size
are initialized before doing any of the allocations that might fail.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfscache.c

index 18509bd..ca05f6d 100644 (file)
@@ -119,6 +119,10 @@ nfsd_reply_cache_free(struct svc_cacherep *rp)
 
 int nfsd_reply_cache_init(void)
 {
+       INIT_LIST_HEAD(&lru_head);
+       max_drc_entries = nfsd_cache_size_limit();
+       num_drc_entries = 0;
+
        register_shrinker(&nfsd_reply_cache_shrinker);
        drc_slab = kmem_cache_create("nfsd_drc", sizeof(struct svc_cacherep),
                                        0, 0, NULL);
@@ -129,10 +133,6 @@ int nfsd_reply_cache_init(void)
        if (!cache_hash)
                goto out_nomem;
 
-       INIT_LIST_HEAD(&lru_head);
-       max_drc_entries = nfsd_cache_size_limit();
-       num_drc_entries = 0;
-
        return 0;
 out_nomem:
        printk(KERN_ERR "nfsd: failed to allocate reply cache\n");