From patchwork Mon Feb 23 18:00:25 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 5867481 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 471FE9F169 for ; Mon, 23 Feb 2015 18:02:39 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7567320465 for ; Mon, 23 Feb 2015 18:02:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 951E520454 for ; Mon, 23 Feb 2015 18:02:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752229AbbBWSCg (ORCPT ); Mon, 23 Feb 2015 13:02:36 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:53930 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751845AbbBWSCf (ORCPT ); Mon, 23 Feb 2015 13:02:35 -0500 Received: from bombadil.infradead.org ([2001:1868:205::9] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.80.1 #2 (Red Hat Linux)) id 1YPxKp-0006DI-Nz; Mon, 23 Feb 2015 18:02:24 +0000 From: Christoph Hellwig To: Al Viro Cc: Maxim Patlasov , Robert Baldyga , Michal Nazarewicz , Felipe Balbi , linux-aio@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 01/12] new helper: dup_iter() Date: Mon, 23 Feb 2015 10:00:25 -0800 Message-Id: <1424714436-19371-2-git-send-email-hch@lst.de> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1424714436-19371-1-git-send-email-hch@lst.de> References: <1424714436-19371-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Al Viro Copy iter and kmemdup the underlying array for the copy. Returns a pointer to result of kmemdup() to be kfree()'d later. Signed-off-by: Al Viro --- include/linux/uio.h | 2 ++ mm/iov_iter.c | 15 +++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/uio.h b/include/linux/uio.h index 07a0226..7188029 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -98,6 +98,8 @@ ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages, size_t maxsize, size_t *start); int iov_iter_npages(const struct iov_iter *i, int maxpages); +const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags); + static inline size_t iov_iter_count(struct iov_iter *i) { return i->count; diff --git a/mm/iov_iter.c b/mm/iov_iter.c index 8277320..9d96e283 100644 --- a/mm/iov_iter.c +++ b/mm/iov_iter.c @@ -751,3 +751,18 @@ int iov_iter_npages(const struct iov_iter *i, int maxpages) return npages; } EXPORT_SYMBOL(iov_iter_npages); + +const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags) +{ + *new = *old; + if (new->type & ITER_BVEC) + return new->bvec = kmemdup(new->bvec, + new->nr_segs * sizeof(struct bio_vec), + flags); + else + /* iovec and kvec have identical layout */ + return new->iov = kmemdup(new->iov, + new->nr_segs * sizeof(struct iovec), + flags); +} +EXPORT_SYMBOL(dup_iter);