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XArray: Add private interface for workingset node deletion

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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>
This commit is contained in:
Matthew Wilcox (Oracle)
2020-08-18 09:05:56 -04:00
parent 8446466c9d
commit f82cd2f0b5
4 changed files with 28 additions and 17 deletions
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23
lib/xarray.c
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@@ -1973,6 +1973,29 @@ 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.