s3 OneFS: Add kernel oplocks implementation

A few functions in oplocks_onefs.c need to be accessed from the onefs
vfs module.  It would be ideal if oplocks were implemented at the vfs
layer, but since they aren't yet, a new header is added to
source3/include to make these functions available to the onefs vfs
module.  oplocks_onefs.o doesn't need to be linked into the onefs vfs
module explicitly, since it is already linked into smbd by default.

1 files changed, 7 insertions, 0 deletions

diff --git a/source3/smbd/oplock.c b/source3/smbd/oplock.c
index a6ec9cfa2d..b39e5bf634 100644
--- a/source3/smbd/oplock.c
+++ b/source3/smbd/oplock.c
@@ -122,6 +122,11 @@ void release_file_oplock(files_struct *fsp)
 
 static void downgrade_file_oplock(files_struct *fsp)
 {
+	if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
+		DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
+		return;
+	}
+
 	if (koplocks) {
 		koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
 	}
@@ -916,6 +921,8 @@ bool init_oplocks(struct messaging_context *msg_ctx)
 		koplocks = irix_init_kernel_oplocks(talloc_autofree_context());
 #elif HAVE_KERNEL_OPLOCKS_LINUX
 		koplocks = linux_init_kernel_oplocks(talloc_autofree_context());
+#elif HAVE_ONEFS
+		koplocks = onefs_init_kernel_oplocks(talloc_autofree_context());
 #endif
 	}