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authorChuck Lever <chuck.lever@oracle.com>2007-03-29 16:47:47 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-04-30 22:17:09 -0700
commit511d2e8855a065c8251d0c140ebc353854f1929e (patch)
treed01c1327f1558ce46ee49dd1ba16da79e7720147 /fs/lockd/xdr4.c
parentca52fec152282ef73e5e882b847b36b1febbb1c6 (diff)
downloadop-kernel-dev-511d2e8855a065c8251d0c140ebc353854f1929e.zip
op-kernel-dev-511d2e8855a065c8251d0c140ebc353854f1929e.tar.gz
NLM: Shrink the maximum request size of NLM4 requests
NLM version 4 requests estimate the call and reply header sizes rather conservatively, using the very maximum size allowed in the protocol even though Linux always uses only a small fraction of the allowable space. Reduce the size of caller and lock arguments to conserve RPC buffer space while XDR encoding NLM4 arguments. Add compile-time checks to ensure the hostname string won't overflow NLM protocol maximums. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/lockd/xdr4.c')
-rw-r--r--fs/lockd/xdr4.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
index a782405..7c8b679 100644
--- a/fs/lockd/xdr4.c
+++ b/fs/lockd/xdr4.c
@@ -516,17 +516,24 @@ nlm4clt_decode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
return 0;
}
+#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
+# error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
+#endif
+
+#if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
+# error "NLM host name cannot be larger than NLM's maximum string length!"
+#endif
+
/*
* Buffer requirements for NLM
*/
#define NLM4_void_sz 0
#define NLM4_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
-#define NLM4_caller_sz 1+XDR_QUADLEN(NLM_MAXSTRLEN)
-#define NLM4_netobj_sz 1+XDR_QUADLEN(XDR_MAX_NETOBJ)
-/* #define NLM4_owner_sz 1+XDR_QUADLEN(NLM4_MAXOWNER) */
+#define NLM4_caller_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE)
+#define NLM4_owner_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE)
#define NLM4_fhandle_sz 1+XDR_QUADLEN(NFS3_FHSIZE)
-#define NLM4_lock_sz 5+NLM4_caller_sz+NLM4_netobj_sz+NLM4_fhandle_sz
-#define NLM4_holder_sz 6+NLM4_netobj_sz
+#define NLM4_lock_sz 5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz
+#define NLM4_holder_sz 6+NLM4_owner_sz
#define NLM4_testargs_sz NLM4_cookie_sz+1+NLM4_lock_sz
#define NLM4_lockargs_sz NLM4_cookie_sz+4+NLM4_lock_sz
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