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/ncpfs/dir.c b/fs/ncpfs/dir.c
index 0ba3cdc95a44..4b9cbb28d7fa 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -633,7 +633,7 @@ ncp_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
                 entry->ino = iunique(dir->i_sb, 2);
                 inode = ncp_iget(dir->i_sb, entry);
                 if (inode) {
-                        newdent->d_op = &ncp_dentry_operations;
+                        d_set_d_op(newdent, &ncp_dentry_operations);
                         d_instantiate(newdent, inode);
                         if (!hashed)
                                 d_rehash(newdent);
@@ -889,7 +889,7 @@ static struct dentry *ncp_lookup(struct inode *dir, struct dentry *dentry, struc
         if (inode) {
                 ncp_new_dentry(dentry);
 add_entry:
-                dentry->d_op = &ncp_dentry_operations;
+                d_set_d_op(dentry, &ncp_dentry_operations);
                 d_add(dentry, inode);
                 error = 0;
         }