When use sunrpc's common DRC:
At first : define a global variable to record the cache with struct drc_cache;
At second: initialize the variable when NLM module be load at init_nlm() by
call drc_reply_cache_init();
At third : the variable will be used to record the request by a new function
nlm_dispatch();
At last : release the variable when NLM module be unload at exit_nlm() by
call drc_reply_cache_shutdown().
This patch's implemention:
1. define a global variable nlm_dc to record the request;
2. add a nlm_dispatch() function reference to nfsd_dispatch(), nlm_dispatch
will be used to process NLM's request;
3. add ".vs_dispatch = nlm_dispatch" to nlmsvc_version1, nlmsvc_version3,
and nlmsvc_version4, which cause the request be processd by nlm_dispatch;
4. add cache type to nlmsvc_procedures4[], only "lock" is RC_REPLSTAT,others
are RC_NOCACHE.
Signed-off-by: Mi Jinlong <mijinlong@xxxxxxxxxxxxxx>
---
fs/lockd/svc.c | 66 +++++++++++++++++++++++++++++++++++++++++++
fs/lockd/svc4proc.c | 52 +++++++++++++++++----------------
include/linux/lockd/lockd.h | 6 ++++
3 files changed, 99 insertions(+), 25 deletions(-)
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 1a54ae1..66d97ce 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -32,6 +32,7 @@
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/drc.h>
#include <linux/sunrpc/svcsock.h>
#include <net/ip.h>
#include <linux/lockd/lockd.h>
@@ -76,6 +77,9 @@ static const int nlm_port_min = 0, nlm_port_max = 65535;
static struct ctl_table_header * nlm_sysctl_table;
#endif
+/* DRC for NLM */
+struct drc_cache nlm_dc;
+
static unsigned long get_lockd_grace_period(void)
{
/* Note: nlm_timeout should always be nonzero */
@@ -363,6 +367,63 @@ out:
}
EXPORT_SYMBOL_GPL(lockd_down);
+/*
+ * DRC for NLM
+ */
+int
+nlm_dispatch(struct svc_rqst *rqstp, u32 *statp)
+{
+ struct svc_procedure *proc;
+ kxdrproc_t xdr;
+
+ dprintk("nlm_dispatch: vers %d proc %d\n",
+ rqstp->rq_vers, rqstp->rq_proc);
+ proc = rqstp->rq_procinfo;
+
+ /* Check whether we have this call in the cache. */
+ switch (drc_cache_lookup(rqstp, proc->pc_cachetype, &nlm_dc)) {
+ case RC_INTR:
+ case RC_DROPIT:
+ return 0;
+ case RC_REPLY:
+ return 1;
+ case RC_DOIT:;
+ /* do it */
+ }
+
+ /* Decode arguments */
+ xdr = proc->pc_decode;
+ if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base,
+ rqstp->rq_argp)) {
+ dprintk("nlm: failed to decode arguments!\n");
+ drc_cache_update(rqstp, RC_NOCACHE, NULL, &nlm_dc);
+ *statp = rpc_garbage_args;
+ return 1;
+ }
+
+ *statp = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
+
+ if (*statp == rpc_drop_reply) {
+ dprintk("nlm: Dropping request due to malloc failure!\n");
+ drc_cache_update(rqstp, RC_NOCACHE, NULL, &nlm_dc);
+ return 0;
+ }
+
+ if (*statp ==rpc_success && (xdr = proc->pc_encode) && !xdr(rqstp,
+ (rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len),
+ rqstp->rq_resp)) {
+ dprintk("nlm: failed to encode result!\n");
+ drc_cache_update(rqstp, RC_NOCACHE, NULL, &nlm_dc);
+ *statp = rpc_system_err;
+ return 1;
+ }
+
+ /* Store reply in cache */
+ drc_cache_update(rqstp, proc->pc_cachetype, statp + 1, &nlm_dc);
+ return 1;
+
+}
+
#ifdef CONFIG_SYSCTL
/*
@@ -525,6 +586,7 @@ module_param(nlm_max_connections, uint, 0644);
static int __init init_nlm(void)
{
+ drc_reply_cache_init(&nlm_dc);
#ifdef CONFIG_SYSCTL
nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
return nlm_sysctl_table ? 0 : -ENOMEM;
@@ -536,6 +598,7 @@ static int __init init_nlm(void)
static void __exit exit_nlm(void)
{
/* FIXME: delete all NLM clients */
+ drc_reply_cache_shutdown(&nlm_dc);
nlm_shutdown_hosts();
#ifdef CONFIG_SYSCTL
unregister_sysctl_table(nlm_sysctl_table);
@@ -552,12 +615,14 @@ static struct svc_version nlmsvc_version1 = {
.vs_vers = 1,
.vs_nproc = 17,
.vs_proc = nlmsvc_procedures,
+ .vs_dispatch = nlm_dispatch,
.vs_xdrsize = NLMSVC_XDRSIZE,
};
static struct svc_version nlmsvc_version3 = {
.vs_vers = 3,
.vs_nproc = 24,
.vs_proc = nlmsvc_procedures,
+ .vs_dispatch = nlm_dispatch,
.vs_xdrsize = NLMSVC_XDRSIZE,
};
#ifdef CONFIG_LOCKD_V4
@@ -565,6 +630,7 @@ static struct svc_version nlmsvc_version4 = {
.vs_vers = 4,
.vs_nproc = 24,
.vs_proc = nlmsvc_procedures4,
+ .vs_dispatch = nlm_dispatch,
.vs_xdrsize = NLMSVC_XDRSIZE,
};
#endif
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index bd173a6..e78cb89 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -13,6 +13,7 @@
#include <linux/smp_lock.h>
#include <linux/in.h>
#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/drc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsd.h>
#include <linux/lockd/lockd.h>
@@ -468,7 +469,7 @@ nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
struct nlm_void { int dummy; };
-#define PROC(name, xargt, xrest, argt, rest, respsize) \
+#define PROC(name, xargt, xrest, argt, rest, respsize, cache) \
{ .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
.pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
.pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
@@ -476,36 +477,37 @@ struct nlm_void { int dummy; };
.pc_argsize = sizeof(struct nlm_##argt), \
.pc_ressize = sizeof(struct nlm_##rest), \
.pc_xdrressize = respsize, \
+ .pc_cachetype = cache, \
}
#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
#define No (1+1024/4) /* netobj */
#define St 1 /* status */
#define Rg 4 /* range (offset + length) */
struct svc_procedure nlmsvc_procedures4[] = {
- PROC(null, void, void, void, void, 1),
- PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
- PROC(lock, lockargs, res, args, res, Ck+St),
- PROC(cancel, cancargs, res, args, res, Ck+St),
- PROC(unlock, unlockargs, res, args, res, Ck+St),
- PROC(granted, testargs, res, args, res, Ck+St),
- PROC(test_msg, testargs, norep, args, void, 1),
- PROC(lock_msg, lockargs, norep, args, void, 1),
- PROC(cancel_msg, cancargs, norep, args, void, 1),
- PROC(unlock_msg, unlockargs, norep, args, void, 1),
- PROC(granted_msg, testargs, norep, args, void, 1),
- PROC(test_res, testres, norep, res, void, 1),
- PROC(lock_res, lockres, norep, res, void, 1),
- PROC(cancel_res, cancelres, norep, res, void, 1),
- PROC(unlock_res, unlockres, norep, res, void, 1),
- PROC(granted_res, res, norep, res, void, 1),
+ PROC(null, void, void, void, void, 1, RC_NOCACHE),
+ PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg, RC_NOCACHE),
+ PROC(lock, lockargs, res, args, res, Ck+St, RC_REPLSTAT),
+ PROC(cancel, cancargs, res, args, res, Ck+St, RC_NOCACHE),
+ PROC(unlock, unlockargs, res, args, res, Ck+St, RC_NOCACHE),
+ PROC(granted, testargs, res, args, res, Ck+St, RC_NOCACHE),
+ PROC(test_msg, testargs, norep, args, void, 1, RC_NOCACHE),
+ PROC(lock_msg, lockargs, norep, args, void, 1, RC_NOCACHE),
+ PROC(cancel_msg, cancargs, norep, args, void, 1, RC_NOCACHE),
+ PROC(unlock_msg, unlockargs, norep, args, void, 1, RC_NOCACHE),
+ PROC(granted_msg, testargs, norep, args, void, 1, RC_NOCACHE),
+ PROC(test_res, testres, norep, res, void, 1, RC_NOCACHE),
+ PROC(lock_res, lockres, norep, res, void, 1, RC_NOCACHE),
+ PROC(cancel_res, cancelres, norep, res, void, 1, RC_NOCACHE),
+ PROC(unlock_res, unlockres, norep, res, void, 1, RC_NOCACHE),
+ PROC(granted_res, res, norep, res, void, 1, RC_NOCACHE),
/* statd callback */
- PROC(sm_notify, reboot, void, reboot, void, 1),
- PROC(none, void, void, void, void, 0),
- PROC(none, void, void, void, void, 0),
- PROC(none, void, void, void, void, 0),
- PROC(share, shareargs, shareres, args, res, Ck+St+1),
- PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
- PROC(nm_lock, lockargs, res, args, res, Ck+St),
- PROC(free_all, notify, void, args, void, 1),
+ PROC(sm_notify, reboot, void, reboot, void, 1, RC_NOCACHE),
+ PROC(none, void, void, void, void, 0, RC_NOCACHE),
+ PROC(none, void, void, void, void, 0, RC_NOCACHE),
+ PROC(none, void, void, void, void, 0, RC_NOCACHE),
+ PROC(share, shareargs, shareres, args, res, Ck+St+1, RC_NOCACHE),
+ PROC(unshare, shareargs, shareres, args, res, Ck+St+1, RC_NOCACHE),
+ PROC(nm_lock, lockargs, res, args, res, Ck+St, RC_NOCACHE),
+ PROC(free_all, notify, void, args, void, 1, RC_NOCACHE),
};
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index a34dea4..7bfea5c 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -198,6 +198,12 @@ extern int nsm_use_hostnames;
extern u32 nsm_local_state;
/*
+ * DRC for NLM
+ */
+
+int nlm_dispatch(struct svc_rqst *rqstp, u32 *stap);
+
+/*
* Lockd client functions
*/
struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
--
1.6.2
--
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