lockd: Remove BKL from the client

This patch removes all calls to lock_kernel() from the client.  This patch
should be applied after the "fs/lock.c prepare for BKL removal" patch submitted
by Arnd Bergmann on September 18.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 10 insertions, 5 deletions

diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index 64fd427c993c..d5bb86866e6c 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -42,6 +42,7 @@ struct nlm_wait {
 };
 
 static LIST_HEAD(nlm_blocked);
+static DEFINE_SPINLOCK(nlm_blocked_lock);
 
 /**
  * nlmclnt_init - Set up per-NFS mount point lockd data structures
@@ -97,7 +98,10 @@ struct nlm_wait *nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *
                 block->b_lock = fl;
                 init_waitqueue_head(&block->b_wait);
                 block->b_status = nlm_lck_blocked;
+
+                spin_lock(&nlm_blocked_lock);
                 list_add(&block->b_list, &nlm_blocked);
+                spin_unlock(&nlm_blocked_lock);
         }
         return block;
 }
@@ -106,7 +110,9 @@ void nlmclnt_finish_block(struct nlm_wait *block)
 {
         if (block == NULL)
                 return;
+        spin_lock(&nlm_blocked_lock);
         list_del(&block->b_list);
+        spin_unlock(&nlm_blocked_lock);
         kfree(block);
 }
 
@@ -154,6 +160,7 @@ __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
          * Look up blocked request based on arguments. 
          * Warning: must not use cookie to match it!
          */
+        spin_lock(&nlm_blocked_lock);
         list_for_each_entry(block, &nlm_blocked, b_list) {
                 struct file_lock *fl_blocked = block->b_lock;
 
@@ -178,6 +185,7 @@ __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
                 wake_up(&block->b_wait);
                 res = nlm_granted;
         }
+        spin_unlock(&nlm_blocked_lock);
         return res;
 }
 
@@ -216,10 +224,6 @@ reclaimer(void *ptr)
         allow_signal(SIGKILL);
 
         down_write(&host->h_rwsem);
-
-        /* This one ensures that our parent doesn't terminate while the
-         * reclaim is in progress */
-        lock_kernel();
         lockd_up();     /* note: this cannot fail as lockd is already running */
 
         dprintk("lockd: reclaiming locks for host %s\n", host->h_name);
@@ -260,16 +264,17 @@ restart:
         dprintk("NLM: done reclaiming locks for host %s\n", host->h_name);
 
         /* Now, wake up all processes that sleep on a blocked lock */
+        spin_lock(&nlm_blocked_lock);
         list_for_each_entry(block, &nlm_blocked, b_list) {
                 if (block->b_host == host) {
                         block->b_status = nlm_lck_denied_grace_period;
                         wake_up(&block->b_wait);
                 }
         }
+        spin_unlock(&nlm_blocked_lock);
 
         /* Release host handle after use */
         nlm_release_host(host);
         lockd_down();
-        unlock_kernel();
         return 0;
 }