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NLM: Shrink the maximum request size of NLM4 requests

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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>
This commit is contained in:
Chuck Lever 2007-03-29 16:47:47 -04:00 • committed by Trond Myklebust
parent ca52fec152
commit 511d2e8855
3 changed files with 21 additions and 11 deletions
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2
include/linux/lockd/lockd.h
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@ -88,7 +88,7 @@ struct nlm_wait;
/*
* Memory chunk for NLM client RPC request.
*/
#define NLMCLNT_OHSIZE (sizeof(utsname()->nodename)+10)
#define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
struct nlm_rqst {
unsigned int a_flags; /* initial RPC task flags */
struct nlm_host * a_host; /* host handle */