From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id E6A646B02CC for ; Wed, 22 Nov 2017 16:10:22 -0500 (EST) Received: by mail-pg0-f70.google.com with SMTP id u3so17276481pgn.3 for ; Wed, 22 Nov 2017 13:10:22 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org. [65.50.211.133]) by mx.google.com with ESMTPS id n1si14251516pgt.498.2017.11.22.13.08.18 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 Nov 2017 13:08:18 -0800 (PST) From: Matthew Wilcox Subject: [PATCH 28/62] xarray: Add xa_destroy Date: Wed, 22 Nov 2017 13:07:05 -0800 Message-Id: <20171122210739.29916-29-willy@infradead.org> In-Reply-To: <20171122210739.29916-1-willy@infradead.org> References: <20171122210739.29916-1-willy@infradead.org> Sender: owner-linux-mm@kvack.org List-ID: To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Matthew Wilcox From: Matthew Wilcox This function frees all the internal memory allocated to the xarray and reinitialises it to be empty. Signed-off-by: Matthew Wilcox --- include/linux/xarray.h | 1 + lib/xarray.c | 26 ++++++++++++++++++++++++++ 2 files changed, 27 insertions(+) diff --git a/include/linux/xarray.h b/include/linux/xarray.h index a48e7aa6406c..347347499652 100644 --- a/include/linux/xarray.h +++ b/include/linux/xarray.h @@ -98,6 +98,7 @@ void *xa_load(struct xarray *, unsigned long index); void *xa_store(struct xarray *, unsigned long index, void *entry, gfp_t); void *xa_cmpxchg(struct xarray *, unsigned long index, void *old, void *entry, gfp_t); +void xa_destroy(struct xarray *); /** * xa_empty() - Determine if an array has any present entries diff --git a/lib/xarray.c b/lib/xarray.c index 9577a70495c0..4fc1073f9454 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1312,3 +1312,29 @@ int xa_get_tagged(struct xarray *xa, void **dst, unsigned long start, return i; } EXPORT_SYMBOL(xa_get_tagged); + +/** + * 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. + */ +void xa_destroy(struct xarray *xa) +{ + XA_STATE(xas, 0); + unsigned long flags; + void *entry; + + xas.xa_node = NULL; + xa_lock_irqsave(xa, flags); + entry = xa_head_locked(xa); + RCU_INIT_POINTER(xa->xa_head, NULL); + xas_init_tags(xa, &xas); + /* lockdep checks we're still holding the lock in xas_free_nodes() */ + if (xa_is_node(entry)) + xas_free_nodes(xa, &xas, xa_to_node(entry)); + xa_unlock_irqrestore(xa, flags); +} +EXPORT_SYMBOL(xa_destroy); -- 2.15.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org