From patchwork Fri Apr 9 18:11:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 12194719 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EDBECC433B4 for ; Fri, 9 Apr 2021 18:11:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9C36610C8 for ; Fri, 9 Apr 2021 18:11:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234637AbhDISLg (ORCPT ); Fri, 9 Apr 2021 14:11:36 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:56360 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234624AbhDISLc (ORCPT ); Fri, 9 Apr 2021 14:11:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617991878; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5d5CRe7IR0f5T94H4kpE1JA/jjTHWSiDJcptaMUWhGo=; b=JzJuf/O6RGk4Weojx+P6Pa+Zl4UkJ/2k/DDZxL9kjVl735xk2kYZxX4weycgTUA7Z+Xr70 4pHy9cgJT0tAT++nJQ1DewRKfy+fyZV0lH2lYyioWSO4CRPTgGXJc8ZKcclnX2WBOsfIhW OwNoX/8wvHg8QQLem9uCqqmYlHGtl5g= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-335-b8GGSwwLNoyHcRe1YIYpDg-1; Fri, 09 Apr 2021 14:11:14 -0400 X-MC-Unique: b8GGSwwLNoyHcRe1YIYpDg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 082B8801FCE; Fri, 9 Apr 2021 18:11:13 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-119-35.rdu2.redhat.com [10.10.119.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6E08160D79; Fri, 9 Apr 2021 18:11:07 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 2/2] iov_iter: Drop the X argument from iterate_all_kinds() and use B instead From: David Howells To: viro@zeniv.linux.org.uk Cc: dhowells@redhat.com, willy@infradead.org, jlayton@kernel.org, hch@lst.de, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com, v9fs-developer@lists.sourceforge.net, linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 09 Apr 2021 19:11:06 +0100 Message-ID: <161799186664.847742.14555840742293852768.stgit@warthog.procyon.org.uk> In-Reply-To: References: User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Drop the X argument from iterate_all_kinds() and use the B argument instead as it's always the same unless the ITER_XARRAY is handled specially. Signed-off-by: David Howells --- lib/iov_iter.c | 42 ++++++++++++------------------------------ 1 file changed, 12 insertions(+), 30 deletions(-) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 93e9838c128d..144abdac11db 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -79,8 +79,8 @@ #define iterate_xarray(i, n, __v, skip, STEP) { \ struct page *head = NULL; \ size_t wanted = n, seg, offset; \ - loff_t start = i->xarray_start + skip; \ - pgoff_t index = start >> PAGE_SHIFT; \ + loff_t xarray_start = i->xarray_start + skip; \ + pgoff_t index = xarray_start >> PAGE_SHIFT; \ int j; \ \ XA_STATE(xas, i->xarray, index); \ @@ -113,7 +113,7 @@ n = wanted - n; \ } -#define iterate_all_kinds(i, n, v, I, B, K, X) { \ +#define iterate_all_kinds(i, n, v, I, B, K) { \ if (likely(n)) { \ size_t skip = i->iov_offset; \ if (unlikely(i->type & ITER_BVEC)) { \ @@ -127,7 +127,7 @@ } else if (unlikely(i->type & ITER_DISCARD)) { \ } else if (unlikely(i->type & ITER_XARRAY)) { \ struct bio_vec v; \ - iterate_xarray(i, n, v, skip, (X)); \ + iterate_xarray(i, n, v, skip, (B)); \ } else { \ const struct iovec *iov; \ struct iovec v; \ @@ -842,9 +842,7 @@ bool _copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i) 0;}), memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page, v.bv_offset, v.bv_len), - memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len), - memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page, - v.bv_offset, v.bv_len) + memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) ) iov_iter_advance(i, bytes); @@ -927,9 +925,7 @@ bool _copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *i) 0;}), memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page, v.bv_offset, v.bv_len), - memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len), - memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page, - v.bv_offset, v.bv_len) + memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) ) iov_iter_advance(i, bytes); @@ -1058,9 +1054,7 @@ size_t iov_iter_copy_from_user_atomic(struct page *page, copyin((p += v.iov_len) - v.iov_len, v.iov_base, v.iov_len), memcpy_from_page((p += v.bv_len) - v.bv_len, v.bv_page, v.bv_offset, v.bv_len), - memcpy((p += v.iov_len) - v.iov_len, v.iov_base, v.iov_len), - memcpy_from_page((p += v.bv_len) - v.bv_len, v.bv_page, - v.bv_offset, v.bv_len) + memcpy((p += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) ) kunmap_atomic(kaddr); return bytes; @@ -1349,8 +1343,7 @@ unsigned long iov_iter_alignment(const struct iov_iter *i) iterate_all_kinds(i, size, v, (res |= (unsigned long)v.iov_base | v.iov_len, 0), res |= v.bv_offset | v.bv_len, - res |= (unsigned long)v.iov_base | v.iov_len, - res |= v.bv_offset | v.bv_len + res |= (unsigned long)v.iov_base | v.iov_len ) return res; } @@ -1372,9 +1365,7 @@ unsigned long iov_iter_gap_alignment(const struct iov_iter *i) (res |= (!res ? 0 : (unsigned long)v.bv_offset) | (size != v.bv_len ? size : 0)), (res |= (!res ? 0 : (unsigned long)v.iov_base) | - (size != v.iov_len ? size : 0)), - (res |= (!res ? 0 : (unsigned long)v.bv_offset) | - (size != v.bv_len ? size : 0)) + (size != v.iov_len ? size : 0)) ); return res; } @@ -1530,8 +1521,7 @@ ssize_t iov_iter_get_pages(struct iov_iter *i, return v.bv_len; }),({ return -EFAULT; - }), - 0 + }) ) return 0; } @@ -1665,7 +1655,7 @@ ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, return v.bv_len; }),({ return -EFAULT; - }), 0 + }) ) return 0; } @@ -1751,13 +1741,6 @@ bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum, v.iov_base, v.iov_len, sum, off); off += v.iov_len; - }), ({ - char *p = kmap_atomic(v.bv_page); - sum = csum_and_memcpy((to += v.bv_len) - v.bv_len, - p + v.bv_offset, v.bv_len, - sum, off); - kunmap_atomic(p); - off += v.bv_len; }) ) *csum = sum; @@ -1892,8 +1875,7 @@ int iov_iter_npages(const struct iov_iter *i, int maxpages) - p / PAGE_SIZE; if (npages >= maxpages) return maxpages; - }), - 0 + }) ) return npages; }