[PATCH 09/12] lockdep: add a page lock class per filesystem type

[Peter Zijlstra]

Provide a different page lock class per filesystem, so we can properly
express the neseting relations between filesystems.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
 fs/filesystems.c   |    1 +
 include/linux/fs.h |    5 +++++
 2 files changed, 6 insertions(+)

Index: linux-2.6/fs/filesystems.c
===================================================================
--- linux-2.6.orig/fs/filesystems.c
+++ linux-2.6/fs/filesystems.c
@@ -73,6 +73,7 @@ int register_filesystem(struct file_syst
 	if (fs->next)
 		return -EBUSY;
 	INIT_LIST_HEAD(&fs->fs_supers);
+	lockdep_init_map(&fs->s_mapping_map, fs->name, &fs->s_mapping_key, 0);
 	write_lock(&file_systems_lock);
 	p = find_filesystem(fs->name, strlen(fs->name));
 	if (*p)
Index: linux-2.6/include/linux/fs.h
===================================================================
--- linux-2.6.orig/include/linux/fs.h
+++ linux-2.6/include/linux/fs.h
@@ -1302,8 +1302,13 @@ struct file_system_type {
 	struct module *owner;
 	struct file_system_type * next;
 	struct list_head fs_supers;
+
 	struct lock_class_key s_lock_key;
 	struct lock_class_key s_umount_key;
+	struct lock_class_key s_mapping_key;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	struct lockdep_map s_mapping_map;
+#endif
 };
 
 extern int get_sb_bdev(struct file_system_type *fs_type,

--

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