Documentation: Add flexible-arrays.rst to the documentation tree
Add flexible-arrays.rst to Documentation/core-api. Add kernel-doc
comments to allow referencing.
Signed-off-by: sayli karnik <karniksayli1995@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/include/linux/flex_array.h b/include/linux/flex_array.h
index b6efb0c..11366b3 100644
--- a/include/linux/flex_array.h
+++ b/include/linux/flex_array.h
@@ -61,16 +61,83 @@ struct flex_array {
FLEX_ARRAY_ELEMENTS_PER_PART(__element_size)); \
}
+/**
+ * flex_array_alloc() - Creates a flexible array.
+ * @element_size: individual object size.
+ * @total: maximum number of objects which can be stored.
+ * @flags: GFP flags
+ *
+ * Return: Returns an object of structure flex_array.
+ */
struct flex_array *flex_array_alloc(int element_size, unsigned int total,
gfp_t flags);
+
+/**
+ * flex_array_prealloc() - Ensures that memory for the elements indexed in the
+ * range defined by start and nr_elements has been allocated.
+ * @fa: array to allocate memory to.
+ * @start: start address
+ * @nr_elements: number of elements to be allocated.
+ * @flags: GFP flags
+ *
+ */
int flex_array_prealloc(struct flex_array *fa, unsigned int start,
unsigned int nr_elements, gfp_t flags);
+
+/**
+ * flex_array_free() - Removes all elements of a flexible array.
+ * @fa: array to be freed.
+ */
void flex_array_free(struct flex_array *fa);
+
+/**
+ * flex_array_free_parts() - Removes all elements of a flexible array, but
+ * leaves the array itself in place.
+ * @fa: array to be emptied.
+ */
void flex_array_free_parts(struct flex_array *fa);
+
+/**
+ * flex_array_put() - Stores data into a flexible array.
+ * @fa: array where element is to be stored.
+ * @element_nr: position to copy, must be less than the maximum specified when
+ * the array was created.
+ * @src: data source to be copied into the array.
+ * @flags: GFP flags
+ *
+ * Return: Returns zero on success, a negative error code otherwise.
+ */
int flex_array_put(struct flex_array *fa, unsigned int element_nr, void *src,
gfp_t flags);
+
+/**
+ * flex_array_clear() - Clears an individual element in the array, sets the
+ * given element to FLEX_ARRAY_FREE.
+ * @element_nr: element position to clear.
+ * @fa: array to which element to be cleared belongs.
+ *
+ * Return: Returns zero on success, -EINVAL otherwise.
+ */
int flex_array_clear(struct flex_array *fa, unsigned int element_nr);
+
+/**
+ * flex_array_get() - Retrieves data into a flexible array.
+ *
+ * @element_nr: Element position to retrieve data from.
+ * @fa: array from which data is to be retrieved.
+ *
+ * Return: Returns a pointer to the data element, or NULL if that
+ * particular element has never been allocated.
+ */
void *flex_array_get(struct flex_array *fa, unsigned int element_nr);
+
+/**
+ * flex_array_shrink() - Reduces the allocated size of an array.
+ * @fa: array to shrink.
+ *
+ * Return: Returns number of pages of memory actually freed.
+ *
+ */
int flex_array_shrink(struct flex_array *fa);
#define flex_array_put_ptr(fa, nr, src, gfp) \