Commit f7790029 authored by Jeff Layton's avatar Jeff Layton Committed by J. Bruce Fields

lockd: move lockd's grace period handling into its own module

Currently, all of the grace period handling is part of lockd. Eventually
though we'd like to be able to build v4-only servers, at which point
we'll need to put all of this elsewhere.

Move the code itself into fs/nfs_common and have it build a grace.ko
module. Then, rejigger the Kconfig options so that both nfsd and lockd
enable it automatically.
Signed-off-by: default avatarJeff Layton <jlayton@primarydata.com>
parent f0c63124
......@@ -233,9 +233,13 @@ if NETWORK_FILESYSTEMS
source "fs/nfs/Kconfig"
source "fs/nfsd/Kconfig"
config GRACE_PERIOD
tristate
config LOCKD
tristate
depends on FILE_LOCKING
select GRACE_PERIOD
config LOCKD_V4
bool
......@@ -249,7 +253,7 @@ config NFS_ACL_SUPPORT
config NFS_COMMON
bool
depends on NFSD || NFS_FS
depends on NFSD || NFS_FS || LOCKD
default y
source "net/sunrpc/Kconfig"
......
......@@ -5,6 +5,6 @@
obj-$(CONFIG_LOCKD) += lockd.o
lockd-objs-y := clntlock.o clntproc.o clntxdr.o host.o svc.o svclock.o \
svcshare.o svcproc.o svcsubs.o mon.o xdr.o grace.o
svcshare.o svcproc.o svcsubs.o mon.o xdr.o
lockd-objs-$(CONFIG_LOCKD_V4) += clnt4xdr.o xdr4.o svc4proc.o
lockd-objs := $(lockd-objs-y)
......@@ -11,7 +11,6 @@ struct lockd_net {
struct delayed_work grace_period_end;
struct lock_manager lockd_manager;
struct list_head grace_list;
spinlock_t nsm_clnt_lock;
unsigned int nsm_users;
......
......@@ -586,7 +586,7 @@ static int lockd_init_net(struct net *net)
struct lockd_net *ln = net_generic(net, lockd_net_id);
INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
INIT_LIST_HEAD(&ln->grace_list);
INIT_LIST_HEAD(&ln->lockd_manager.list);
spin_lock_init(&ln->nsm_clnt_lock);
return 0;
}
......
......@@ -3,5 +3,6 @@
#
obj-$(CONFIG_NFS_ACL_SUPPORT) += nfs_acl.o
nfs_acl-objs := nfsacl.o
obj-$(CONFIG_GRACE_PERIOD) += grace.o
/*
* Common code for control of lockd and nfsv4 grace periods.
*
* Transplanted from lockd code
*/
#include <linux/module.h>
#include <linux/lockd/bind.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <linux/fs.h>
#include "netns.h"
static int grace_net_id;
static DEFINE_SPINLOCK(grace_lock);
/**
* locks_start_grace
* @net: net namespace that this lock manager belongs to
* @lm: who this grace period is for
*
* A grace period is a period during which locks should not be given
......@@ -21,18 +24,20 @@ static DEFINE_SPINLOCK(grace_lock);
*
* This function is called to start a grace period.
*/
void locks_start_grace(struct net *net, struct lock_manager *lm)
void
locks_start_grace(struct net *net, struct lock_manager *lm)
{
struct lockd_net *ln = net_generic(net, lockd_net_id);
struct list_head *grace_list = net_generic(net, grace_net_id);
spin_lock(&grace_lock);
list_add(&lm->list, &ln->grace_list);
list_add(&lm->list, grace_list);
spin_unlock(&grace_lock);
}
EXPORT_SYMBOL_GPL(locks_start_grace);
/**
* locks_end_grace
* @net: net namespace that this lock manager belongs to
* @lm: who this grace period is for
*
* Call this function to state that the given lock manager is ready to
......@@ -41,7 +46,8 @@ EXPORT_SYMBOL_GPL(locks_start_grace);
* Note that callers count on it being safe to call this more than once,
* and the second call should be a no-op.
*/
void locks_end_grace(struct lock_manager *lm)
void
locks_end_grace(struct lock_manager *lm)
{
spin_lock(&grace_lock);
list_del_init(&lm->list);
......@@ -56,10 +62,52 @@ EXPORT_SYMBOL_GPL(locks_end_grace);
* to answer ordinary lock requests, and when they should accept only
* lock reclaims.
*/
int locks_in_grace(struct net *net)
int
locks_in_grace(struct net *net)
{
struct lockd_net *ln = net_generic(net, lockd_net_id);
struct list_head *grace_list = net_generic(net, grace_net_id);
return !list_empty(&ln->grace_list);
return !list_empty(grace_list);
}
EXPORT_SYMBOL_GPL(locks_in_grace);
static int __net_init
grace_init_net(struct net *net)
{
struct list_head *grace_list = net_generic(net, grace_net_id);
INIT_LIST_HEAD(grace_list);
return 0;
}
static void __net_exit
grace_exit_net(struct net *net)
{
struct list_head *grace_list = net_generic(net, grace_net_id);
BUG_ON(!list_empty(grace_list));
}
static struct pernet_operations grace_net_ops = {
.init = grace_init_net,
.exit = grace_exit_net,
.id = &grace_net_id,
.size = sizeof(struct list_head),
};
static int __init
init_grace(void)
{
return register_pernet_subsys(&grace_net_ops);
}
static void __exit
exit_grace(void)
{
unregister_pernet_subsys(&grace_net_ops);
}
MODULE_AUTHOR("Jeff Layton <jlayton@primarydata.com>");
MODULE_LICENSE("GPL");
module_init(init_grace)
module_exit(exit_grace)
......@@ -71,6 +71,7 @@ config NFSD_V4
select FS_POSIX_ACL
select SUNRPC_GSS
select CRYPTO
select GRACE_PERIOD
help
This option enables support in your system's NFS server for
version 4 of the NFS protocol (RFC 3530).
......
......@@ -74,6 +74,8 @@ static inline int remove_proc_subtree(const char *name, struct proc_dir_entry *p
#endif /* CONFIG_PROC_FS */
struct net;
static inline struct proc_dir_entry *proc_net_mkdir(
struct net *net, const char *name, struct proc_dir_entry *parent)
{
......
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