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>
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index e9acea4..36637a8 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -442,7 +442,7 @@
return error;
}
- dentry->d_op = &configfs_dentry_ops;
+ d_set_d_op(dentry, &configfs_dentry_ops);
d_rehash(dentry);
return 0;
@@ -489,7 +489,7 @@
*/
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
- dentry->d_op = &configfs_dentry_ops;
+ d_set_d_op(dentry, &configfs_dentry_ops);
d_add(dentry, NULL);
return NULL;
}
@@ -683,7 +683,7 @@
ret = -ENOMEM;
child = d_alloc(parent, &name);
if (child) {
- child->d_op = &configfs_dentry_ops;
+ d_set_d_op(child, &configfs_dentry_ops);
d_add(child, NULL);
ret = configfs_attach_group(&parent_group->cg_item,
@@ -1681,7 +1681,7 @@
err = -ENOMEM;
dentry = d_alloc(configfs_sb->s_root, &name);
if (dentry) {
- dentry->d_op = &configfs_dentry_ops;
+ d_set_d_op(dentry, &configfs_dentry_ops);
d_add(dentry, NULL);
err = configfs_attach_group(sd->s_element, &group->cg_item,