From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox 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> References: <20171206004159.3755-1-willy@infradead.org> Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=7MAWtlUzLpedaelWnQcuXXz8j9EM9EIprKttz7mvaVI=; b=KXy6oZsQvSVLsazlFw79TLcrt Xhcd7qba3TEyAtCL7rKQ+Q/8yo4w+XBGaNt6f4OKaEPj4OWtlhKqE+mje+JhRjqGfIQHPz4aqs4b5 3IRiYj7F33//1PM89O7xUKSkywYLu2QLSYZip6pJnneujHYLbdoKTukwBqjW29jAZMIOYG1KEu2nZ F7wSjy/NbPuePLIcWEBsVdCzgtXkLW4ssxm6YvGulavZnHOkCbncled5bNqUSEqFo37c5UADWP7Lv 5H/vnju0WkELvueaxUK68CzA0cCNCam/D6ppCKWj1ZN8oQnBfXUVY6h4wI8zP2lQoDRddn02KL+l9 In-Reply-To: <20171206004159.3755-1-willy@infradead.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: 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 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