CIFS: Turn lock mutex into rw semaphore

and allow several processes to walk through the lock list and read
can_cache_brlcks value if they are not going to modify them.

Signed-off-by: Pavel Shilovsky <pshilovsky@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d3c72713fec4..e2492e1cdb85 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1000,7 +1000,7 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
 struct cifsInodeInfo {
         bool can_cache_brlcks;
         struct list_head llist; /* locks helb by this inode */
-        struct mutex lock_mutex;        /* protect the fields above */
+        struct rw_semaphore lock_sem;   /* protect the fields above */
         /* BB add in lists for dirty pages i.e. write caching info for oplock */
         struct list_head openFileList;
         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */