The main purpose of this patchset is to fix potential infinite loop in debugfs_remove_recursive. Al Viro want to refactor it (https://lore.kernel.org/lkml/20191115184209.GT26530@xxxxxxxxxxxxxxxxxx/). I can't really tell if it's better. Since debugfs_remove_recursive is still using 'simple_empty', whitch is wrong, I'm sending this patchset just in case. The first patch add a new enum type for 'dentry_d_lock_class'.The second patch use the new enum type in 'simple_empty' to avoid confusion for lockdep. The last patch fix potential infinite loop in debugfs_remove_recursive by using 'simple_empty' instead of 'list_empty'. changes in V2: rename the new enum type in the first patch, add some comments. yu kuai (3): dcache: add a new enum type for 'dentry_d_lock_class' fs/libfs.c: use 'spin_lock_nested' when taking 'd_lock' for dentry in simple_empty debugfs: fix potential infinite loop in debugfs_remove_recursive fs/debugfs/inode.c | 7 +++++-- fs/libfs.c | 4 ++-- include/linux/dcache.h | 11 ++++++++++- 3 files changed, 17 insertions(+), 5 deletions(-) -- 2.17.2
