[PATCH 4/4] dcache: don't need to take d_lock in prepend_path()

The d_lock was used in prepend_path() to protect dentry->d_name from being changed under the hood. As the caller of prepend_path() has to take the rename_lock before calling into it, there is no chance that d_name will be changed. The d_lock lock is only needed when the rename_lock is not taken.

[PATCH 4/4] dcache: don't need to take d_lock in prepend_path()

The d_lock was used in prepend_path() to protect dentry-d_name from being changed under the hood. As the caller of prepend_path() has to take the rename_lock before calling into it, there is no chance that d_name will be changed. The d_lock lock is only needed when the rename_lock is not taken.