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svcrpc: simpler request dropping 

Currently we use -EAGAIN returns to determine when to drop a deferred
request.  On its own, that is error-prone, as it makes us treat -EAGAIN
returns from other functions specially to prevent inadvertent dropping.

So, use a flag on the request instead.

Returning an error on request deferral is still required, to prevent
further processing, but we no longer need worry that an error return on
its own could result in a drop.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2011-01-02 21:56:36 -05:00
parent d76d1815f3
commit 9e701c6109
4 changed files with 5 additions and 2 deletions
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2
fs/nfsd/nfssvc.c
View File

@ -608,7 +608,7 @@ nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp)
/* Now call the procedure handler, and encode NFS status. */
nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
nfserr = map_new_errors(rqstp->rq_vers, nfserr);
if (nfserr == nfserr_dropit) {
if (nfserr == nfserr_dropit || rqstp->rq_dropme) {
dprintk("nfsd: Dropping request; may be revisited later\n");
nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
return 0;

1
include/linux/sunrpc/svc.h
View File

@ -269,6 +269,7 @@ struct svc_rqst {
struct cache_req rq_chandle; /* handle passed to caches for
* request delaying
*/
bool rq_dropme;
/* Catering to nfsd */
struct auth_domain * rq_client; /* RPC peer info */
struct auth_domain * rq_gssclient; /* "gss/"-style peer info */

3
net/sunrpc/svc.c
View File

@ -1005,6 +1005,7 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
rqstp->rq_splice_ok = 1;
/* Will be turned off only when NFSv4 Sessions are used */
rqstp->rq_usedeferral = 1;
rqstp->rq_dropme = false;
/* Setup reply header */
rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
@ -1106,7 +1107,7 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
*statp = procp->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
/* Encode reply */
if (*statp == rpc_drop_reply) {
if (rqstp->rq_dropme) {
if (procp->pc_release)
procp->pc_release(rqstp, NULL, rqstp->rq_resp);
goto dropit;

1
net/sunrpc/svc_xprt.c
View File

@ -1019,6 +1019,7 @@ static struct cache_deferred_req *svc_defer(struct cache_req *req)
}
svc_xprt_get(rqstp->rq_xprt);
dr->xprt = rqstp->rq_xprt;
rqstp->rq_dropme = true;
dr->handle.revisit = svc_revisit;
return &dr->handle;