[PATCH 2/4] leases: when unlocking, skip locking-related steps

["David M. Richter" <richterd@citi.umich.edu>]

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>
---
 fs/locks.c |   24 +++++++++++++-----------
 1 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index b9f3a0b..da1d0dd 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
-- 
1.5.4