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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-08-18 09:05:56 -0400
committerMatthew Wilcox (Oracle) <willy@infradead.org>2020-10-13 08:41:26 -0400
commitf82cd2f0b5eb715b1a296e20b34da7d296b6e9a4 (patch)
treed932395ef576740b64fc24e9be268fe00ecbc56a /lib
parent8446466c9dd645da4c1848f35ffd0fc1df3524ee (diff)
downloadlinux-f82cd2f0b5eb715b1a296e20b34da7d296b6e9a4.tar.bz2
XArray: Add private interface for workingset node deletion
Move the tricky bits of dealing with the XArray from the workingset code to the XArray. Make it clear in the documentation that this is a private interface, and only export it for the benefit of the test suite. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/test_xarray.c7
-rw-r--r--lib/xarray.c23
2 files changed, 24 insertions, 6 deletions
diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index 1122c4453c87..64ae07b1bcf4 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -1600,14 +1600,9 @@ static noinline void shadow_remove(struct xarray *xa)
xa_lock(xa);
while ((node = list_first_entry_or_null(&shadow_nodes,
struct xa_node, private_list))) {
- XA_STATE(xas, node->array, 0);
XA_BUG_ON(xa, node->array != xa);
list_del_init(&node->private_list);
- xas.xa_node = xa_parent_locked(node->array, node);
- xas.xa_offset = node->offset;
- xas.xa_shift = node->shift + XA_CHUNK_SHIFT;
- xas_set_update(&xas, test_update_node);
- xas_store(&xas, NULL);
+ xa_delete_node(node, test_update_node);
}
xa_unlock(xa);
}
diff --git a/lib/xarray.c b/lib/xarray.c
index e9e641d3c0c3..1fa5c5658e63 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1974,6 +1974,29 @@ unsigned int xa_extract(struct xarray *xa, void **dst, unsigned long start,
EXPORT_SYMBOL(xa_extract);
/**
+ * xa_delete_node() - Private interface for workingset code.
+ * @node: Node to be removed from the tree.
+ * @update: Function to call to update ancestor nodes.
+ *
+ * Context: xa_lock must be held on entry and will not be released.
+ */
+void xa_delete_node(struct xa_node *node, xa_update_node_t update)
+{
+ struct xa_state xas = {
+ .xa = node->array,
+ .xa_index = (unsigned long)node->offset <<
+ (node->shift + XA_CHUNK_SHIFT),
+ .xa_shift = node->shift + XA_CHUNK_SHIFT,
+ .xa_offset = node->offset,
+ .xa_node = xa_parent_locked(node->array, node),
+ .xa_update = update,
+ };
+
+ xas_store(&xas, NULL);
+}
+EXPORT_SYMBOL_GPL(xa_delete_node); /* For the benefit of the test suite */
+
+/**
* xa_destroy() - Free all internal data structures.
* @xa: XArray.
*