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, 3 insertions, 3 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index c9627c95482d..c9a8a426a395 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -347,7 +347,7 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
         }
 
         entry = newent ? newent : entry;
-        entry->d_op = &fuse_dentry_operations;
+        d_set_d_op(entry, &fuse_dentry_operations);
         if (outarg_valid)
                 fuse_change_entry_timeout(entry, &outarg);
         else
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 44e0a6c57e87..a8b31da19b93 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -626,7 +626,7 @@ static struct dentry *fuse_get_dentry(struct super_block *sb,
 
         entry = d_obtain_alias(inode);
         if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) {
-                entry->d_op = &fuse_dentry_operations;
+                d_set_d_op(entry, &fuse_dentry_operations);
                 fuse_invalidate_entry_cache(entry);
         }
 
@@ -728,7 +728,7 @@ static struct dentry *fuse_get_parent(struct dentry *child)
 
         parent = d_obtain_alias(inode);
         if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) {
-                parent->d_op = &fuse_dentry_operations;
+                d_set_d_op(parent, &fuse_dentry_operations);
                 fuse_invalidate_entry_cache(parent);
         }