• NeilBrown's avatar
    [PATCH] Fix over-zealous tag clearing in radix_tree_delete · 90f9dd8f
    NeilBrown authored
    If a tag is set for a node being deleted from a radix_tree, then that
    tag gets cleared from the parent of the node, even if it is set for some
    siblings of the node begin deleted.
    This patch changes the logic to include a test for any_tag_set similar
    to the logic a little futher down.  Care is taken to ensure that
    'nr_cleared_tags' remains equals to the number of entries in the 'tags'
    array which are set to '0' (which means that this tag is not set in the
    tree below pathp->node, and should be cleared at pathp->node and
    possibly above.
    [ Nick says: "Linus FYI, I was able to modify the radix tree test
      harness to catch the bug and can no longer trigger it after the fix.
      Resulting code passes all other harness tests as well of course." ]
    Signed-off-by: default avatarNeil Brown <neilb@suse.de>
    Acked-by: default avatarNick Piggin <npiggin@suse.de>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
radix-tree.c 20.8 KB