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authorJeff Layton <jlayton@redhat.com>2008-10-20 11:51:57 -0400
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-01-06 11:53:47 -0500
commitc9233eb7b0b11ef176d4bf68da2ce85464b6ec39 (patch)
tree22f9f999e0d48a5f3aae6b32f9ff702eb4db05cc /include/linux/sunrpc
parent548eaca46b3cf4419b6c2be839a106d8641ffb70 (diff)
sunrpc: add sv_maxconn field to svc_serv (try #3)
svc_check_conn_limits() attempts to prevent denial of service attacks by having the service close old connections once it reaches a threshold. This threshold is based on the number of threads in the service: (serv->sv_nrthreads + 3) * 20 Once we reach this, we drop the oldest connections and a printk pops to warn the admin that they should increase the number of threads. Increasing the number of threads isn't an option however for services like lockd. We don't want to eliminate this check entirely for such services but we need some way to increase this limit. This patch adds a sv_maxconn field to the svc_serv struct. When it's set to 0, we use the current method to calculate the max number of connections. RPC services can then set this on an as-needed basis. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'include/linux/sunrpc')
-rw-r--r--include/linux/sunrpc/svc.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 3afe7fb403b..3435d24bfe5 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -58,10 +58,13 @@ struct svc_serv {
struct svc_stat * sv_stats; /* RPC statistics */
spinlock_t sv_lock;
unsigned int sv_nrthreads; /* # of server threads */
+ unsigned int sv_maxconn; /* max connections allowed or
+ * '0' causing max to be based
+ * on number of threads. */
+
unsigned int sv_max_payload; /* datagram payload size */
unsigned int sv_max_mesg; /* max_payload + 1 page for overheads */
unsigned int sv_xdrsize; /* XDR buffer size */
-
struct list_head sv_permsocks; /* all permanent sockets */
struct list_head sv_tempsocks; /* all temporary sockets */
int sv_tmpcnt; /* count of temporary sockets */