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>
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 @@
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