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>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index b3e36c3430de..c3a5a1126833 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -121,7 +121,7 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh)
         security_d_instantiate(ret, inode);
 
         if (ret->d_op == NULL)
-                ret->d_op = server->nfs_client->rpc_ops->dentry_ops;
+                d_set_d_op(ret, server->nfs_client->rpc_ops->dentry_ops);
 out:
         nfs_free_fattr(fsinfo.fattr);
         return ret;
@@ -228,7 +228,7 @@ struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
         security_d_instantiate(ret, inode);
 
         if (ret->d_op == NULL)
-                ret->d_op = server->nfs_client->rpc_ops->dentry_ops;
+                d_set_d_op(ret, server->nfs_client->rpc_ops->dentry_ops);
 
 out:
         nfs_free_fattr(fattr);