[Linux-cachefs] An incorrect assumption over radix_tree_tag_get()

[David Howells]

Nick Piggin <npiggin at suse.de> wrote:

> It is safe. Synchronization requirements for using the radix tree API
> are documented.

I presume you mean the big comment on it in radix-tree.h.

According to that, it is not safe:

 * - any function _modifying_ the tree or tags (inserting or deleting
 *   items, setting or clearing tags) must exclude other modifications, and
 *   exclude any functions reading the tree.
 
David