fs: dcache reduce branches in lookup path

Reduce some branches and memory accesses in dcache lookup by adding dentry
flags to indicate common d_ops are set, rather than having to check them.
This saves a pointer memory access (dentry->d_op) in common path lookup
situations, and saves another pointer load and branch in cases where we
have d_op but not the particular operation.

Patched with:

git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

2 files changed, 2 insertions, 2 deletions

diff --git a/net/socket.c b/net/socket.c
index 817dc92e9ef8..991e266bc7ae 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -368,7 +368,7 @@ static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
         }
         path.mnt = mntget(sock_mnt);
 
-        path.dentry->d_op = &sockfs_dentry_operations;
+        d_set_d_op(path.dentry, &sockfs_dentry_operations);
         d_instantiate(path.dentry, SOCK_INODE(sock));
         SOCK_INODE(sock)->i_fop = &socket_file_ops;
 
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 2899fe27f880..09f01f41e55a 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -591,7 +591,7 @@ static struct dentry *__rpc_lookup_create(struct dentry *parent,
                 }
         }
         if (!dentry->d_inode)
-                dentry->d_op = &rpc_dentry_operations;
+                d_set_d_op(dentry, &rpc_dentry_operations);
 out_err:
         return dentry;
 }