Re: [PATCH v2 1/3] xattr: extract kmem_xattr code from tmpfs

[Li Zefan <lizf-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>]

Hillf Danton wrote:
> On Thu, Mar 1, 2012 at 2:17 PM, Li Zefan <lizf-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org> wrote:
>> +/*
>> + * free all the xattrs
>> + */
>> +void kmem_xattrs_free(struct kmem_xattrs *xattrs)
>> +{
>> +       struct kmem_xattr *xattr, *node;
>> +
>> +       spin_lock(&xattrs->lock);
>> +       list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
>> +               kfree(xattr->name);
>> +               kfree(xattr);
>> +       }
>> +       spin_unlock(&xattrs->lock);
> 
> In your work it is a library function, operations on &xattrs->head
> are no longer allowed, say list_empty(), after it called, though I
> dunno if such operations exist.
> 

I'd prefer to make it safer to use, so I'll re-init the list head
after freeing all the list items.

> And kmem_xattrs is too close to kmem_xattr, kmem_xattr_list
> is not pron of typo.
> 

Then you won't pass compile. ;)

kmem_xattr_list exposed the data structure we used internally.
We might change to use an rbtree.