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Subject[PATCH 09/15] knfsd: move nfsv4 slab creation/destruction to module init/exit
Date
From: J. Bruce Fields <bfields@citi.umich.edu>

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: "J. Bruce Fields" <bfields@citi.umich.edu>
---
fs/nfsd/nfs4state.c | 22 ++++++++++------------
fs/nfsd/nfsctl.c | 5 ++++-
fs/nfsd/nfssvc.c | 4 +---
include/linux/nfsd/nfsd.h | 18 ++++++++++--------
4 files changed, 25 insertions(+), 24 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 2b20eb8..09573b9 100644
--- a/fs/nfsd/nfs4state.c
+++ b/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();
}

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index baac89d..d135f5f 100644
--- a/fs/nfsd/nfsctl.c
+++ b/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);
}

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index ef46f32..1190aea 100644
--- a/fs/nfsd/nfssvc.c
+++ b/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();

diff --git a/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index e452256..604a0d7 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/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

/*
--
1.5.3.rc5.19.g0734d
-
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