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    Subject[PATCH 09/12] lockdep: add a page lock class per filesystem type
    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@chello.nl>
    ---
    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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