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-rw-r--r--fs/inode.c12
-rw-r--r--include/linux/fs.h1
2 files changed, 13 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c
index bf6adf1..f97de0a 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -567,6 +567,18 @@ EXPORT_SYMBOL(new_inode);
void unlock_new_inode(struct inode *inode)
{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ struct file_system_type *type = inode->i_sb->s_type;
+ /*
+ * ensure nobody is actually holding i_mutex
+ */
+ mutex_destroy(&inode->i_mutex);
+ mutex_init(&inode->i_mutex);
+ if (inode->i_mode & S_IFDIR)
+ lockdep_set_class(&inode->i_mutex, &type->i_mutex_dir_key);
+ else
+ lockdep_set_class(&inode->i_mutex, &type->i_mutex_key);
+#endif
/*
* This is special! We do not need the spinlock
* when clearing I_LOCK, because we're guaranteed
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0cad20e..6d760f1 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1308,6 +1308,7 @@ struct file_system_type {
struct lock_class_key i_lock_key;
struct lock_class_key i_mutex_key;
+ struct lock_class_key i_mutex_dir_key;
struct lock_class_key i_alloc_sem_key;
};
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