knfsd: move nfsv4 slab creation/destruction to module init/exit

We have some slabs that the nfs4 server uses to store state objects.
We're currently creating and destroying those slabs whenever the server
is brought up or down.  That seems excessive; may as well just do that
in module initialization and exit.

Also add some minor header cleanup.  (Thanks to Andrew Morton for that
and a compile fix.)
Signed-off-by: N"J. Bruce Fields" <bfields@citi.umich.edu>
Acked-by: NNeil Brown <neilb@suse.de>

fs/nfsd/nfs4state.c

@@ -1021,7 +1021,7 @@ nfsd4_free_slab(struct kmem_cache **slab)
 	*slab = NULL;
 }
 
-static void
+void
 nfsd4_free_slabs(void)
 {
 	nfsd4_free_slab(&stateowner_slab);
@@ -3152,11 +3152,14 @@ nfs4_check_open_reclaim(clientid_t *clid)
 
 /* initialization to perform at module load time: */
 
-void
+int
 nfs4_state_init(void)
 {
-	int i;
+	int i, status;
 
+	status = nfsd4_init_slabs();
+	if (status)
+		return status;
 	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
 		INIT_LIST_HEAD(&conf_id_hashtbl[i]);
 		INIT_LIST_HEAD(&conf_str_hashtbl[i]);
@@ -3185,6 +3188,7 @@ nfs4_state_init(void)
 	for (i = 0; i < CLIENT_HASH_SIZE; i++)
 		INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
 	reclaim_str_hashtbl_size = 0;
+	return 0;
 }
 
 static void
@@ -3245,20 +3249,15 @@ __nfs4_state_start(void)
 	set_max_delegations();
 }
 
-int
+void
 nfs4_state_start(void)
 {
-	int status;
-
 	if (nfs4_init)
-		return 0;
-	status = nfsd4_init_slabs();
-	if (status)
-		return status;
+		return;
 	nfsd4_load_reboot_recovery_data();
 	__nfs4_state_start();
 	nfs4_init = 1;
-	return 0;
+	return;
 }
 
 int
@@ -3316,7 +3315,6 @@ nfs4_state_shutdown(void)
 	nfs4_lock_state();
 	nfs4_release_reclaim();
 	__nfs4_state_shutdown();
-	nfsd4_free_slabs();
 	nfs4_unlock_state();
 }
 

fs/nfsd/nfsctl.c

@@ -679,11 +679,13 @@ static int __init init_nfsd(void)
 	int retval;
 	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 
+	retval = nfs4_state_init(); /* nfs4 locking state */
+	if (retval)
+		return retval;
 	nfsd_stat_init();	/* Statistics */
 	nfsd_cache_init();	/* RPC reply cache */
 	nfsd_export_init();	/* Exports table */
 	nfsd_lockd_init();	/* lockd->nfsd callbacks */
-	nfs4_state_init();	/* NFSv4 locking state */
 	nfsd_idmap_init();      /* Name to ID mapping */
 	if (proc_mkdir("fs/nfs", NULL)) {
 		struct proc_dir_entry *entry;
@@ -712,6 +714,7 @@ static void __exit exit_nfsd(void)
 	nfsd_stat_shutdown();
 	nfsd_lockd_shutdown();
 	nfsd_idmap_shutdown();
+	nfsd4_free_slabs();
 	unregister_filesystem(&nfsd_fs_type);
 }
 

fs/nfsd/nfssvc.c

@@ -349,9 +349,7 @@ nfsd_svc(unsigned short port, int nrservs)
 	error =	nfsd_racache_init(2*nrservs);
 	if (error<0)
 		goto out;
-	error = nfs4_state_start();
-	if (error<0)
-		goto out;
+	nfs4_state_start();
 
 	nfsd_reset_versions();
 

include/linux/nfsd/nfsd.h

@@ -153,19 +153,21 @@ extern int nfsd_max_blksize;
  */
 #ifdef CONFIG_NFSD_V4
 extern unsigned int max_delegations;
-void nfs4_state_init(void);
-int nfs4_state_start(void);
+int nfs4_state_init(void);
+void nfsd4_free_slabs(void);
+void nfs4_state_start(void);
 void nfs4_state_shutdown(void);
 time_t nfs4_lease_time(void);
 void nfs4_reset_lease(time_t leasetime);
 int nfs4_reset_recoverydir(char *recdir);
 #else
-static inline void nfs4_state_init(void){};
-static inline int nfs4_state_start(void){return 0;}
-static inline void nfs4_state_shutdown(void){}
-static inline time_t nfs4_lease_time(void){return 0;}
-static inline void nfs4_reset_lease(time_t leasetime){}
-static inline int nfs4_reset_recoverydir(char *recdir) {return 0;}
+static inline int nfs4_state_init(void) { return 0; }
+static inline void nfsd4_free_slabs(void) { }
+static inline void nfs4_state_start(void) { }
+static inline void nfs4_state_shutdown(void) { }
+static inline time_t nfs4_lease_time(void) { return 0; }
+static inline void nfs4_reset_lease(time_t leasetime) { }
+static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
 #endif
 
 /*