From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754413AbdLFBCC (ORCPT ); Tue, 5 Dec 2017 20:02:02 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:49114 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753308AbdLFAmK (ORCPT ); Tue, 5 Dec 2017 19:42:10 -0500 From: Matthew Wilcox Cc: Matthew Wilcox , Ross Zwisler , Jens Axboe , Rehas Sachdeva , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nilfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 16/73] xarray: Add xa_destroy Date: Tue, 5 Dec 2017 16:41:02 -0800 Message-Id: <20171206004159.3755-17-willy@infradead.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20171206004159.3755-1-willy@infradead.org> References: <20171206004159.3755-1-willy@infradead.org> To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 c3efcc3432f7..b648c1b93d9f 100644 --- a/include/linux/xarray.h +++ b/include/linux/xarray.h @@ -74,6 +74,7 @@ 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_erase() - Erase this entry from the XArray. diff --git a/lib/xarray.c b/lib/xarray.c index 251724f62b11..f3875b251b41 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1341,6 +1341,32 @@ int xa_get_tagged(struct xarray *xa, void **dst, unsigned long start, } 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, xa, 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(&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)); + xa_unlock_irqrestore(xa, flags); +} +EXPORT_SYMBOL(xa_destroy); + #ifdef XA_DEBUG void xa_dump_entry(void *entry, unsigned long index) { -- 2.15.0