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authorJ. Bruce Fields <bfields@citi.umich.edu>2007-09-06 12:34:25 -0400
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-10-03 16:19:02 -0400
commitaf558e33bedab672f5cfd3260bce7445e353fe21 (patch)
treeeb89187b6c12640a00584bd35be035ba332e4af3 /fs/lockd/svc.c
parentd5b337b4877f7c4e1d761434ee04d045b0201e03 (diff)
nfsd: common grace period control
Rewrite grace period code to unify management of grace period across lockd and nfsd. The current code has lockd and nfsd cooperate to compute a grace period which is satisfactory to them both, and then individually enforce it. This creates a slight race condition, since the enforcement is not coordinated. It's also more complicated than necessary. Here instead we have lockd and nfsd each inform common code when they enter the grace period, and when they're ready to leave the grace period, and allow normal locking only after both of them are ready to leave. We also expect the locks_start_grace()/locks_end_grace() interface here to be simpler to build on for future cluster/high-availability work, which may require (for example) putting individual filesystems into grace, or enforcing grace periods across multiple cluster nodes. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'fs/lockd/svc.c')
-rw-r--r--fs/lockd/svc.c20
1 files changed, 5 insertions, 15 deletions
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index f345ef7fb8a..f013aed1153 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -51,7 +51,6 @@ static DEFINE_MUTEX(nlmsvc_mutex);
static unsigned int nlmsvc_users;
static struct task_struct *nlmsvc_task;
static struct svc_rqst *nlmsvc_rqst;
-int nlmsvc_grace_period;
unsigned long nlmsvc_timeout;
/*
@@ -85,30 +84,21 @@ static unsigned long get_lockd_grace_period(void)
return nlm_timeout * 5 * HZ;
}
-unsigned long get_nfs_grace_period(void)
-{
- unsigned long lockdgrace = get_lockd_grace_period();
- unsigned long nfsdgrace = 0;
-
- if (nlmsvc_ops)
- nfsdgrace = nlmsvc_ops->get_grace_period();
-
- return max(lockdgrace, nfsdgrace);
-}
-EXPORT_SYMBOL(get_nfs_grace_period);
+static struct lock_manager lockd_manager = {
+};
static void grace_ender(struct work_struct *not_used)
{
- nlmsvc_grace_period = 0;
+ locks_end_grace(&lockd_manager);
}
static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
static void set_grace_period(void)
{
- unsigned long grace_period = get_nfs_grace_period() + jiffies;
+ unsigned long grace_period = get_lockd_grace_period();
- nlmsvc_grace_period = 1;
+ locks_start_grace(&lockd_manager);
cancel_delayed_work_sync(&grace_period_end);
schedule_delayed_work(&grace_period_end, grace_period);
}