leases: when unlocking, skip locking-related steps

In generic_setlease(), we don't need to allocate a new struct file_lock
or check for readers or writers when called with F_UNLCK.

Signed-off-by: David M. Richter <richterd@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 13 insertions, 11 deletions

diff --git a/fs/locks.c b/fs/locks.c
index b9f3a0bed300..da1d0ddb4abd 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1367,18 +1367,20 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
 
         lease = *flp;
 
-        error = -EAGAIN;
-        if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0))
-                goto out;
-        if ((arg == F_WRLCK)
-            && ((atomic_read(&dentry->d_count) > 1)
-                || (atomic_read(&inode->i_count) > 1)))
-                goto out;
+        if (arg != F_UNLCK) {
+                error = -EAGAIN;
+                if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0))
+                        goto out;
+                if ((arg == F_WRLCK)
+                    && ((atomic_read(&dentry->d_count) > 1)
+                        || (atomic_read(&inode->i_count) > 1)))
+                        goto out;
 
-        error = -ENOMEM;
-        new_fl = locks_alloc_lock();
-        if (new_fl == NULL)
-                goto out;
+                error = -ENOMEM;
+                new_fl = locks_alloc_lock();
+                if (new_fl == NULL)
+                        goto out;
+        }
 
         /*
          * At this point, we know that if there is an exclusive