fs: dcache reduce locking in d_alloc
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
diff --git a/fs/dcache.c b/fs/dcache.c
index 98a0569..ccdc5c2 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1253,11 +1253,13 @@
if (parent) {
spin_lock(&parent->d_lock);
- spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
+ /*
+ * don't need child lock because it is not subject
+ * to concurrency here
+ */
dentry->d_parent = dget_dlock(parent);
dentry->d_sb = parent->d_sb;
list_add(&dentry->d_u.d_child, &parent->d_subdirs);
- spin_unlock(&dentry->d_lock);
spin_unlock(&parent->d_lock);
}