NFS: Add options for finer control of the lookup cache
Add the flag NFS_MOUNT_LOOKUP_CACHE_NONEG to turn off the caching of
negative dentries. In reality what we do is to force
nfs_lookup_revalidate() to always discard negative dentries.
Add the flag NFS_MOUNT_LOOKUP_CACHE_NONE for enforcing stricter
revalidation of dentries. It forces the revalidate code to always do a
lookup instead of just checking the cached mtime of the parent directory.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs_mount.h b/include/linux/nfs_mount.h
index df7c6b7..6549a06 100644
--- a/include/linux/nfs_mount.h
+++ b/include/linux/nfs_mount.h
@@ -65,4 +65,8 @@
#define NFS_MOUNT_UNSHARED 0x8000 /* 5 */
#define NFS_MOUNT_FLAGMASK 0xFFFF
+/* The following are for internal use only */
+#define NFS_MOUNT_LOOKUP_CACHE_NONEG 0x10000
+#define NFS_MOUNT_LOOKUP_CACHE_NONE 0x20000
+
#endif