From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 068B6C7EE2A for ; Sat, 20 May 2023 00:02:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229673AbjETAC2 (ORCPT ); Fri, 19 May 2023 20:02:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51402 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229449AbjETAC1 (ORCPT ); Fri, 19 May 2023 20:02:27 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C25EBE6B for ; Fri, 19 May 2023 17:01:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1684540869; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PT+Bun0dIbxZdwJScwf3VqpEC9/8xV7aRQjBWH3biT0=; b=FYnJVdDJOeWe21gzOleNanwhr2gSLtC/fNFaiynujIWed84NITZ3KjLMTUWs7O2Xa0nI0C emMPDyyEjWNHWIucugSj33UF7UoBgzGvLleeuASx0d1riHral/GDTLz+i8hVvpTgiL73AR Lj/RheXi6y7ONBPCFQNc0/cdxwi9WRw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-624-hfhZbVVlMdejFFXt6z0GIA-1; Fri, 19 May 2023 20:01:06 -0400 X-MC-Unique: hfhZbVVlMdejFFXt6z0GIA-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id ABCF7101A53A; Sat, 20 May 2023 00:01:05 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.42.28.221]) by smtp.corp.redhat.com (Postfix) with ESMTP id 721554F2DE0; Sat, 20 May 2023 00:01:03 +0000 (UTC) From: David Howells To: Jens Axboe , Al Viro , Christoph Hellwig Cc: David Howells , Matthew Wilcox , Jan Kara , Jeff Layton , David Hildenbrand , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Christian Brauner , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig , John Hubbard Subject: [PATCH v21 04/30] splice: Clean up copy_splice_read() a bit Date: Sat, 20 May 2023 01:00:23 +0100 Message-Id: <20230520000049.2226926-5-dhowells@redhat.com> In-Reply-To: <20230520000049.2226926-1-dhowells@redhat.com> References: <20230520000049.2226926-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Do a couple of cleanups to copy_splice_read(): (1) Cast to struct page **, not void *. (2) Simplify the calculation of the number of pages to keep/reclaim in copy_splice_read(). Suggested-by: Christoph Hellwig Signed-off-by: David Howells Reviewed-by: Christoph Hellwig cc: Jens Axboe cc: Al Viro cc: David Hildenbrand cc: John Hubbard cc: linux-mm@kvack.org cc: linux-block@vger.kernel.org cc: linux-fsdevel@vger.kernel.org --- Notes: ver #21) - direct_splice_read() got renamed to copy_splice_read(). fs/splice.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/fs/splice.c b/fs/splice.c index 2478e065bc53..f9a9be797b0c 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -311,7 +311,7 @@ ssize_t copy_splice_read(struct file *in, loff_t *ppos, struct kiocb kiocb; struct page **pages; ssize_t ret; - size_t used, npages, chunk, remain, reclaim; + size_t used, npages, chunk, remain, keep = 0; int i; /* Work out how much data we can actually add into the pipe */ @@ -325,7 +325,7 @@ ssize_t copy_splice_read(struct file *in, loff_t *ppos, if (!bv) return -ENOMEM; - pages = (void *)(bv + npages); + pages = (struct page **)(bv + npages); npages = alloc_pages_bulk_array(GFP_USER, npages, pages); if (!npages) { kfree(bv); @@ -348,11 +348,8 @@ ssize_t copy_splice_read(struct file *in, loff_t *ppos, kiocb.ki_pos = *ppos; ret = call_read_iter(in, &kiocb, &to); - reclaim = npages * PAGE_SIZE; - remain = 0; if (ret > 0) { - reclaim -= ret; - remain = ret; + keep = DIV_ROUND_UP(ret, PAGE_SIZE); *ppos = kiocb.ki_pos; file_accessed(in); } else if (ret < 0) { @@ -365,14 +362,12 @@ ssize_t copy_splice_read(struct file *in, loff_t *ppos, } /* Free any pages that didn't get touched at all. */ - reclaim /= PAGE_SIZE; - if (reclaim) { - npages -= reclaim; - release_pages(pages + npages, reclaim); - } + if (keep < npages) + release_pages(pages + keep, npages - keep); /* Push the remaining pages into the pipe. */ - for (i = 0; i < npages; i++) { + remain = ret; + for (i = 0; i < keep; i++) { struct pipe_buffer *buf = pipe_head_buf(pipe); chunk = min_t(size_t, remain, PAGE_SIZE);