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nfsd: Reorder nfsd_cache_match to check more powerful discriminators first

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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
1 changed files with 11 additions and 7 deletions
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18
fs/nfsd/nfscache.c
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@ -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;
}