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Commit ef9b16dc authored by Trond Myklebust's avatar Trond Myklebust Committed by J. Bruce Fields
Browse files

nfsd: Reorder nfsd_cache_match to check more powerful discriminators first 



We would normally expect the xid and the checksum to be the best
discriminators. Check them before looking at the procedure number,
etc.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 89a26b3d

fs/nfsd/nfscache.c

+11 −7
Original line number Diff line number Diff line
@@ -338,20 +338,24 @@ nfsd_cache_csum(struct svc_rqst *rqstp) 
static bool

nfsd_cache_match(struct svc_rqst *rqstp, __wsum csum, struct svc_cacherep *rp)

{

	/* Check RPC header info first */

	if (rqstp->rq_xid != rp->c_xid || rqstp->rq_proc != rp->c_proc ||

	    rqstp->rq_prot != rp->c_prot || rqstp->rq_vers != rp->c_vers ||

	    rqstp->rq_arg.len != rp->c_len ||

	    !rpc_cmp_addr(svc_addr(rqstp), (struct sockaddr *)&rp->c_addr) ||

	    rpc_get_port(svc_addr(rqstp)) != rpc_get_port((struct sockaddr *)&rp->c_addr))

	/* Check RPC XID first */

	if (rqstp->rq_xid != rp->c_xid)

		return false;



	/* compare checksum of NFS data */

	if (csum != rp->c_csum) {

		++payload_misses;

		return false;

	}



	/* Other discriminators */

	if (rqstp->rq_proc != rp->c_proc ||

	    rqstp->rq_prot != rp->c_prot ||

	    rqstp->rq_vers != rp->c_vers ||

	    rqstp->rq_arg.len != rp->c_len ||

	    !rpc_cmp_addr(svc_addr(rqstp), (struct sockaddr *)&rp->c_addr) ||

	    rpc_get_port(svc_addr(rqstp)) != rpc_get_port((struct sockaddr *)&rp->c_addr))

		return false;



	return true;

}