From 85085aacefc62fe58f89fdcf695e2d1155ff45d9 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Thu, 1 Oct 2020 18:59:33 -0400 Subject: NFSD: Refactor nfsd_dispatch() error paths nfsd_dispatch() is a hot path. Ensure the compiler takes the processing of rare error cases out of line. Signed-off-by: Chuck Lever Signed-off-by: J. Bruce Fields --- fs/nfsd/nfssvc.c | 60 +++++++++++++++++++++++++++++++++----------------------- 1 file changed, 35 insertions(+), 25 deletions(-) (limited to 'fs/nfsd') diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index aa516838ce0b..e793344227c9 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -1021,29 +1021,24 @@ int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) dprintk("nfsd_dispatch: vers %d proc %d\n", rqstp->rq_vers, rqstp->rq_proc); - if (nfs_request_too_big(rqstp, proc)) { - dprintk("nfsd: NFSv%d argument too large\n", rqstp->rq_vers); - *statp = rpc_garbage_args; - return 1; - } + if (nfs_request_too_big(rqstp, proc)) + goto out_too_large; + /* * Give the xdr decoder a chance to change this if it wants * (necessary in the NFSv4.0 compound case) */ rqstp->rq_cachetype = proc->pc_cachetype; - if (!proc->pc_decode(rqstp, argv->iov_base)) { - dprintk("nfsd: failed to decode arguments!\n"); - *statp = rpc_garbage_args; - return 1; - } + if (!proc->pc_decode(rqstp, argv->iov_base)) + goto out_decode_err; switch (nfsd_cache_lookup(rqstp)) { case RC_DOIT: break; case RC_REPLY: - return 1; + goto out_cached_reply; case RC_DROPIT: - return 0; + goto out_dropit; } /* @@ -1055,11 +1050,8 @@ int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) nfserr = proc->pc_func(rqstp); nfserr = map_new_errors(rqstp->rq_vers, nfserr); - if (nfserr == nfserr_dropit || test_bit(RQ_DROPME, &rqstp->rq_flags)) { - dprintk("nfsd: Dropping request; may be revisited later\n"); - nfsd_cache_update(rqstp, RC_NOCACHE, NULL); - return 0; - } + if (nfserr == nfserr_dropit || test_bit(RQ_DROPME, &rqstp->rq_flags)) + goto out_update_drop; if (rqstp->rq_proc != 0) *nfserrp++ = nfserr; @@ -1067,16 +1059,34 @@ int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) /* * For NFSv2, additional info is never returned in case of an error. */ - if (!(nfserr && rqstp->rq_vers == 2)) { - if (!proc->pc_encode(rqstp, nfserrp)) { - dprintk("nfsd: failed to encode result!\n"); - nfsd_cache_update(rqstp, RC_NOCACHE, NULL); - *statp = rpc_system_err; - return 1; - } - } + if (!(nfserr && rqstp->rq_vers == 2)) + if (!proc->pc_encode(rqstp, nfserrp)) + goto out_encode_err; nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1); +out_cached_reply: + return 1; + +out_too_large: + dprintk("nfsd: NFSv%d argument too large\n", rqstp->rq_vers); + *statp = rpc_garbage_args; + return 1; + +out_decode_err: + dprintk("nfsd: failed to decode arguments!\n"); + *statp = rpc_garbage_args; + return 1; + +out_update_drop: + dprintk("nfsd: Dropping request; may be revisited later\n"); + nfsd_cache_update(rqstp, RC_NOCACHE, NULL); +out_dropit: + return 0; + +out_encode_err: + dprintk("nfsd: failed to encode result!\n"); + nfsd_cache_update(rqstp, RC_NOCACHE, NULL); + *statp = rpc_system_err; return 1; } -- cgit v1.2.3