CIFS: Implement caching mechanism for mandatory brlocks

If we have an oplock and negotiate mandatory locking style we handle
all brlock requests on the client.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Acked-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d153d0b89d39..8238aa13e01c 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -496,6 +496,8 @@ extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
  */
 struct cifsLockInfo {
         struct list_head llist; /* pointer to next cifsLockInfo */
+        struct list_head blist; /* pointer to locks blocked on this */
+        wait_queue_head_t block_q;
         __u64 offset;
         __u64 length;
         __u32 pid;