From patchwork Fri Dec 15 22:03:51 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 10116175 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EDEC46019C for ; Fri, 15 Dec 2017 22:11:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E02FA29D7C for ; Fri, 15 Dec 2017 22:11:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D499F2A1B7; Fri, 15 Dec 2017 22:11:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5545829D7C for ; Fri, 15 Dec 2017 22:11:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932453AbdLOWJA (ORCPT ); Fri, 15 Dec 2017 17:09:00 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:50697 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756521AbdLOWFd (ORCPT ); Fri, 15 Dec 2017 17:05:33 -0500 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=VsNQh1fdv8Focxwh2MU+9hBSKnRZnr4VFPK+a5By27U=; b=G6ld/bF56TIvV1hoh+dXoY6ZO nUG3TdyV6Xs/LyPJt2avcmOacbqOZtbkHhCzsnd4QJRblb3RWYVkKyqz/2PouZLht9e5wI+v35hNi PkgpsWZeY4XQvsYFlhS3aLfjViv0BvB2oQRNF6Ji2yWPSCuHAvkQRk/hpijSIfWRHR1Z9/BAhpEfa QYh/DJJvV7/LQ+6b30CYINFzIVQvhXsGf7n8DE73rWQLDHdrLgU6+uKUfEbYvAyxb7Jj44Ffe6+WB d+hsek4zu+oR4w4Ijj/gztvpob3epS7OCRw0uA5ifV0IehDZldQ/FZsVCEEJOJW3sxhYK+Dc/oyci Bt9+BZO1A==; Received: from willy by bombadil.infradead.org with local (Exim 4.87 #1 (Red Hat Linux)) id 1ePy6G-00026M-6Y; Fri, 15 Dec 2017 22:05:00 +0000 From: Matthew Wilcox To: linux-kernel@vger.kernel.org Cc: Matthew Wilcox , Ross Zwisler , David Howells , Shaohua Li , Jens Axboe , Rehas Sachdeva , Marc Zyngier , 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-raid@vger.kernel.org Subject: [PATCH v5 19/78] xarray: Add xas_create_range Date: Fri, 15 Dec 2017 14:03:51 -0800 Message-Id: <20171215220450.7899-20-willy@infradead.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20171215220450.7899-1-willy@infradead.org> References: <20171215220450.7899-1-willy@infradead.org> Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Matthew Wilcox This hopefully temporary function is useful for users who have not yet been converted to multi-index entries. Signed-off-by: Matthew Wilcox --- include/linux/xarray.h | 2 ++ lib/xarray.c | 22 ++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/linux/xarray.h b/include/linux/xarray.h index 2d889208b68d..bcc321fb280f 100644 --- a/include/linux/xarray.h +++ b/include/linux/xarray.h @@ -685,6 +685,8 @@ void xas_init_tags(const struct xa_state *); bool xas_nomem(struct xa_state *, gfp_t); void xas_pause(struct xa_state *); +void xas_create_range(struct xa_state *, unsigned long max); + /** * xas_reload() - Refetch an entry from the xarray. * @xas: XArray operation state. diff --git a/lib/xarray.c b/lib/xarray.c index a4975aeedf6b..e3be7c0c2e35 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -605,6 +605,28 @@ void *xas_create(struct xa_state *xas) } EXPORT_SYMBOL_GPL(xas_create); +/** + * xas_create_range() - Ensure that stores to this range will succeed + * @xas: XArray operation state. + * @max: The highest index to create a slot for. + * + * Creates all of the slots in the range between the current position of + * @xas and @max. This is for the benefit of users who have not yet been + * converted to multi-index entries. + * + * The implementation is naive. + */ +void xas_create_range(struct xa_state *xas, unsigned long max) +{ + XA_STATE(tmp, xas->xa, xas->xa_index); + + do { + xas_create(&tmp); + xas_set(&tmp, tmp.xa_index + XA_CHUNK_SIZE); + } while (tmp.xa_index < max); +} +EXPORT_SYMBOL_GPL(xas_create_range); + static void store_siblings(struct xa_state *xas, void *entry, int *countp, int *valuesp) {