diff options
| author |   Johannes Weiner <hannes@cmpxchg.org> | 2016-12-12 16:43:49 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 18:55:08 -0800 |
| commit | 4d693d08607ab319095ec8942909df4b4aebdf66 (patch) | |
| tree | 02b3c0da72cc8f39c1e16387658d76e8351affb6 /include/linux/radix-tree.h | |
| parent | lib: radix-tree: add entry deletion support to __radix_tree_replace() (diff) | |
| download | wireguard-linux-4d693d08607ab319095ec8942909df4b4aebdf66.tar.xz wireguard-linux-4d693d08607ab319095ec8942909df4b4aebdf66.zip | |
lib: radix-tree: update callback for changing leaf nodes
Support handing __radix_tree_replace() a callback that gets invoked for
all leaf nodes that change or get freed as a result of the slot
replacement, to assist users tracking nodes with node->private_list.
This prepares for putting page cache shadow entries into the radix tree
root again and drastically simplifying the shadow tracking.
Link: http://lkml.kernel.org/r/20161117193134.GD23430@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <mawilcox@linuxonhyperv.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/radix-tree.h')
| -rw-r--r-- | include/linux/radix-tree.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h index 2d1b9b8be983..15c972ea9510 100644 --- a/include/linux/radix-tree.h +++ b/include/linux/radix-tree.h @@ -263,9 +263,11 @@ void *__radix_tree_lookup(struct radix_tree_root *root, unsigned long index, struct radix_tree_node **nodep, void ***slotp); void *radix_tree_lookup(struct radix_tree_root *, unsigned long); void **radix_tree_lookup_slot(struct radix_tree_root *, unsigned long); +typedef void (*radix_tree_update_node_t)(struct radix_tree_node *, void *); void __radix_tree_replace(struct radix_tree_root *root, struct radix_tree_node *node, - void **slot, void *item); + void **slot, void *item, + radix_tree_update_node_t update_node, void *private); void radix_tree_replace_slot(struct radix_tree_root *root, void **slot, void *item); bool __radix_tree_delete_node(struct radix_tree_root *root, |