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: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2014-08-06 13:44:25 -04:00 committed by J. Bruce Fields
parent 89a26b3d29
commit ef9b16dc6d

View File

@ -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;
}