locks: allow {vfs,posix}_lock_file to return conflicting lock

The nfsv4 protocol's lock operation, in the case of a conflict, returns
information about the conflicting lock.

It's unclear how clients can use this, so for now we're not going so far as to
add a filesystem method that can return a conflicting lock, but we may as well
return something in the local case when it's easy to.

Signed-off-by: Marc Eshel <eshel@almaden.ibm.com>
Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 97b0160ef10f..3b0e7a4b817b 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -363,7 +363,7 @@ again:
         } else
                 lock = &block->b_call->a_args.lock;
 
-        error = posix_lock_file(file->f_file, &lock->fl);
+        error = posix_lock_file(file->f_file, &lock->fl, NULL);
         lock->fl.fl_flags &= ~FL_SLEEP;
 
         dprintk("lockd: posix_lock_file returned %d\n", error);
@@ -467,7 +467,7 @@ nlmsvc_unlock(struct nlm_file *file, struct nlm_lock *lock)
         nlmsvc_cancel_blocked(file, lock);
 
         lock->fl.fl_type = F_UNLCK;
-        error = posix_lock_file(file->f_file, &lock->fl);
+        error = posix_lock_file(file->f_file, &lock->fl, NULL);
 
         return (error < 0)? nlm_lck_denied_nolocks : nlm_granted;
 }
@@ -569,7 +569,7 @@ nlmsvc_grant_blocked(struct nlm_block *block)
 
         /* Try the lock operation again */
         lock->fl.fl_flags |= FL_SLEEP;
-        error = posix_lock_file(file->f_file, &lock->fl);
+        error = posix_lock_file(file->f_file, &lock->fl, NULL);
         lock->fl.fl_flags &= ~FL_SLEEP;
 
         switch (error) {