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| author | Chuck Lever <chuck.lever@oracle.com> | 2007-03-30 00:47:47 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-05-01 09:17:09 +0400 |
| commit | 511d2e8855a065c8251d0c140ebc353854f1929e (patch) | |
| tree | d01c1327f1558ce46ee49dd1ba16da79e7720147 /fs/lockd/xdr.c | |
| parent | ca52fec152282ef73e5e882b847b36b1febbb1c6 (diff) | |
| download | linux-511d2e8855a065c8251d0c140ebc353854f1929e.tar.xz | |
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/xdr.c')
| -rw-r--r-- | fs/lockd/xdr.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c index 34dae5d70738..6aac4b2c9ff0 100644 --- a/fs/lockd/xdr.c +++ b/fs/lockd/xdr.c @@ -510,17 +510,20 @@ nlmclt_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 + /* * Buffer requirements for NLM */ #define NLM_void_sz 0 #define NLM_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN) -#define NLM_caller_sz 1+XDR_QUADLEN(sizeof(utsname()->nodename)) -#define NLM_netobj_sz 1+XDR_QUADLEN(XDR_MAX_NETOBJ) -/* #define NLM_owner_sz 1+XDR_QUADLEN(NLM_MAXOWNER) */ +#define NLM_caller_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE) +#define NLM_owner_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE) #define NLM_fhandle_sz 1+XDR_QUADLEN(NFS2_FHSIZE) -#define NLM_lock_sz 3+NLM_caller_sz+NLM_netobj_sz+NLM_fhandle_sz -#define NLM_holder_sz 4+NLM_netobj_sz +#define NLM_lock_sz 3+NLM_caller_sz+NLM_owner_sz+NLM_fhandle_sz +#define NLM_holder_sz 4+NLM_owner_sz #define NLM_testargs_sz NLM_cookie_sz+1+NLM_lock_sz #define NLM_lockargs_sz NLM_cookie_sz+4+NLM_lock_sz |