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/fs/affs/namei.c b/fs/affs/namei.c
index 5aca08c21100..944a4042fb65 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -240,7 +240,7 @@ affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
                 if (IS_ERR(inode))
                         return ERR_CAST(inode);
         }
-        dentry->d_op = AFFS_SB(sb)->s_flags & SF_INTL ? &affs_intl_dentry_operations : &affs_dentry_operations;
+        d_set_d_op(dentry, AFFS_SB(sb)->s_flags & SF_INTL ? &affs_intl_dentry_operations : &affs_dentry_operations);
         d_add(dentry, inode);
         return NULL;
 }
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 4c18fcfb0a19..d39081bbe7ce 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -482,7 +482,7 @@ got_root:
                 printk(KERN_ERR "AFFS: Get root inode failed\n");
                 goto out_error;
         }
-        sb->s_root->d_op = &affs_dentry_operations;
+        d_set_d_op(sb->s_root, &affs_dentry_operations);
 
         pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
         return 0;