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    Subject[PATCH v9 20/61] xarray: Add xa_destroy
    Date
    From: Matthew Wilcox <mawilcox@microsoft.com>

    This function frees all the internal memory allocated to the xarray
    and reinitialises it to be empty.

    Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
    ---
    include/linux/xarray.h | 1 +
    lib/xarray.c | 28 ++++++++++++++++++++++++++++
    2 files changed, 29 insertions(+)

    diff --git a/include/linux/xarray.h b/include/linux/xarray.h
    index 85dd909586f0..96773f83ae03 100644
    --- a/include/linux/xarray.h
    +++ b/include/linux/xarray.h
    @@ -229,6 +229,7 @@ void *xa_find_after(struct xarray *xa, unsigned long *index,
    unsigned long max, xa_tag_t) __attribute__((nonnull(2)));
    unsigned int xa_extract(struct xarray *, void **dst, unsigned long start,
    unsigned long max, unsigned int n, xa_tag_t);
    +void xa_destroy(struct xarray *);

    /**
    * xa_init() - Initialise an empty XArray.
    diff --git a/lib/xarray.c b/lib/xarray.c
    index 124bbfec66ae..080ed0fc3feb 100644
    --- a/lib/xarray.c
    +++ b/lib/xarray.c
    @@ -1468,6 +1468,34 @@ unsigned int xa_extract(struct xarray *xa, void **dst, unsigned long start,
    }
    EXPORT_SYMBOL(xa_extract);

    +/**
    + * xa_destroy() - Free all internal data structures.
    + * @xa: XArray.
    + *
    + * After calling this function, the XArray is empty and has freed all memory
    + * allocated for its internal data structures. You are responsible for
    + * freeing the objects referenced by the XArray.
    + *
    + * Context: Any context. Takes and releases the xa_lock, interrupt-safe.
    + */
    +void xa_destroy(struct xarray *xa)
    +{
    + XA_STATE(xas, xa, 0);
    + unsigned long flags;
    + void *entry;
    +
    + xas.xa_node = NULL;
    + xas_lock_irqsave(&xas, flags);
    + entry = xa_head_locked(xa);
    + RCU_INIT_POINTER(xa->xa_head, NULL);
    + xas_init_tags(&xas);
    + /* lockdep checks we're still holding the lock in xas_free_nodes() */
    + if (xa_is_node(entry))
    + xas_free_nodes(&xas, xa_to_node(entry));
    + xas_unlock_irqrestore(&xas, flags);
    +}
    +EXPORT_SYMBOL(xa_destroy);
    +
    #ifdef XA_DEBUG
    void xa_dump_node(const struct xa_node *node)
    {
    --
    2.16.1
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