fs/locks: merge posix_unblock_lock() and locks_delete_block()

posix_unblock_lock() is not specific to posix locks, and behaves
nearly identically to locks_delete_block() - the former returning a
status while the later doesn't.

So discard posix_unblock_lock() and use locks_delete_block() instead,
after giving that function an appropriate return value.

Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>

5 files changed, 21 insertions, 31 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index d7ed895e05d1..94c3575e850c 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1106,7 +1106,7 @@ try_again:
                 rc = wait_event_interruptible(flock->fl_wait, !flock->fl_blocker);
                 if (!rc)
                         goto try_again;
-                posix_unblock_lock(flock);
+                locks_delete_block(flock);
         }
         return rc;
 }
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 74330daeab71..ea719cdd6a36 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -276,7 +276,7 @@ static int nlmsvc_unlink_block(struct nlm_block *block)
         dprintk("lockd: unlinking block %p...\n", block);
 
         /* Remove block from list */
-        status = posix_unblock_lock(&block->b_call->a_args.lock.fl);
+        status = locks_delete_block(&block->b_call->a_args.lock.fl);
         nlmsvc_remove_block(block);
         return status;
 }
diff --git a/fs/locks.c b/fs/locks.c
index 4d6a5a3f903a..75a03a9d666e 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -748,8 +748,16 @@ static void __locks_wake_up_blocks(struct file_lock *blocker)
         }
 }
 
-static void locks_delete_block(struct file_lock *waiter)
+/**
+ *      locks_delete_lock - stop waiting for a file lock
+ *      @waiter: the lock which was waiting
+ *
+ *      lockd/nfsd need to disconnect the lock while working on it.
+ */
+int locks_delete_block(struct file_lock *waiter)
 {
+        int status = -ENOENT;
+
         /*
          * If fl_blocker is NULL, it won't be set again as this thread
          * "owns" the lock and is the only one that might try to claim
@@ -763,12 +771,16 @@ static void locks_delete_block(struct file_lock *waiter)
          */
         if (waiter->fl_blocker == NULL &&
             list_empty(&waiter->fl_blocked_requests))
-                return;
+                return status;
         spin_lock(&blocked_lock_lock);
+        if (waiter->fl_blocker)
+                status = 0;
         __locks_wake_up_blocks(waiter);
         __locks_delete_block(waiter);
         spin_unlock(&blocked_lock_lock);
+        return status;
 }
+EXPORT_SYMBOL(locks_delete_block);
 
 /* Insert waiter into blocker's block list.
  * We use a circular list so that processes can be easily woken up in
@@ -2676,28 +2688,6 @@ void locks_remove_file(struct file *filp)
 }
 
 /**
- *      posix_unblock_lock - stop waiting for a file lock
- *      @waiter: the lock which was waiting
- *
- *      lockd needs to block waiting for locks.
- */
-int
-posix_unblock_lock(struct file_lock *waiter)
-{
-        int status = -ENOENT;
-
-        spin_lock(&blocked_lock_lock);
-        if (waiter->fl_blocker) {
-                __locks_wake_up_blocks(waiter);
-                __locks_delete_block(waiter);
-                status = 0;
-        }
-        spin_unlock(&blocked_lock_lock);
-        return status;
-}
-EXPORT_SYMBOL(posix_unblock_lock);
-
-/**
  * vfs_cancel_lock - file byte range unblock lock
  * @filp: The file to apply the unblock to
  * @fl: The lock to be unblocked
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index f093fbe47133..a334828723fa 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -238,7 +238,7 @@ find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
         }
         spin_unlock(&nn->blocked_locks_lock);
         if (found)
-                posix_unblock_lock(&found->nbl_lock);
+                locks_delete_block(&found->nbl_lock);
         return found;
 }
 
@@ -293,7 +293,7 @@ remove_blocked_locks(struct nfs4_lockowner *lo)
                 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
                                         nbl_lru);
                 list_del_init(&nbl->nbl_lru);
-                posix_unblock_lock(&nbl->nbl_lock);
+                locks_delete_block(&nbl->nbl_lock);
                 free_blocked_lock(nbl);
         }
 }
@@ -4863,7 +4863,7 @@ nfs4_laundromat(struct nfsd_net *nn)
                 nbl = list_first_entry(&reaplist,
                                         struct nfsd4_blocked_lock, nbl_lru);
                 list_del_init(&nbl->nbl_lru);
-                posix_unblock_lock(&nbl->nbl_lock);
+                locks_delete_block(&nbl->nbl_lock);
                 free_blocked_lock(nbl);
         }
 out:
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 16df3a7df378..26a8607b3c3c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1124,7 +1124,7 @@ extern void locks_remove_file(struct file *);
 extern void locks_release_private(struct file_lock *);
 extern void posix_test_lock(struct file *, struct file_lock *);
 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
-extern int posix_unblock_lock(struct file_lock *);
+extern int locks_delete_block(struct file_lock *);
 extern int vfs_test_lock(struct file *, struct file_lock *);
 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
@@ -1214,7 +1214,7 @@ static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
         return -ENOLCK;
 }
 
-static inline int posix_unblock_lock(struct file_lock *waiter)
+static inline int locks_delete_block(struct file_lock *waiter)
 {
         return -ENOENT;
 }