From patchwork Thu May 12 14:35:12 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 621597 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3r5GH44hL3z9t41 for ; Fri, 13 May 2016 00:54:40 +1000 (AEST) Received: from localhost ([::1]:58012 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b0s0c-0007Ul-PP for incoming@patchwork.ozlabs.org; Thu, 12 May 2016 10:54:38 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51960) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b0rjM-0005a3-GV for qemu-devel@nongnu.org; Thu, 12 May 2016 10:36:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b0rjD-00040K-T0 for qemu-devel@nongnu.org; Thu, 12 May 2016 10:36:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46525) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b0rj9-0003xz-Oc; Thu, 12 May 2016 10:36:35 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4F79A63335; Thu, 12 May 2016 14:36:35 +0000 (UTC) Received: from noname.redhat.com (ovpn-116-37.ams2.redhat.com [10.36.116.37]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u4CEZp9A028730; Thu, 12 May 2016 10:36:34 -0400 From: Kevin Wolf To: qemu-block@nongnu.org Date: Thu, 12 May 2016 16:35:12 +0200 Message-Id: <1463063749-2201-33-git-send-email-kwolf@redhat.com> In-Reply-To: <1463063749-2201-1-git-send-email-kwolf@redhat.com> References: <1463063749-2201-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Thu, 12 May 2016 14:36:35 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 32/69] block: Introduce byte-based aio read/write X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Eric Blake blk_aio_readv() and blk_aio_writev() are annoying in that they can't access sub-sector granularity, and cannot pass flags. Also, they require the caller to pass redundant information about the size of the I/O (qiov->size in bytes must match nb_sectors in sectors). Add new blk_aio_preadv() and blk_aio_pwritev() functions to fix the flaws. The next few patches will upgrade callers, then finally delete the old interfaces. Signed-off-by: Eric Blake Signed-off-by: Kevin Wolf --- block/block-backend.c | 18 +++++++++++++++++- include/sysemu/block-backend.h | 8 +++++++- 2 files changed, 24 insertions(+), 2 deletions(-) diff --git a/block/block-backend.c b/block/block-backend.c index f8f88a6..6ac76d0 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -1,7 +1,7 @@ /* * QEMU Block backends * - * Copyright (C) 2014 Red Hat, Inc. + * Copyright (C) 2014-2016 Red Hat, Inc. * * Authors: * Markus Armbruster , @@ -998,6 +998,14 @@ BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num, blk_aio_read_entry, 0, cb, opaque); } +BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, + QEMUIOVector *qiov, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque) +{ + return blk_aio_prwv(blk, offset, qiov->size, qiov, + blk_aio_read_entry, flags, cb, opaque); +} + BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num, QEMUIOVector *iov, int nb_sectors, BlockCompletionFunc *cb, void *opaque) @@ -1011,6 +1019,14 @@ BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num, blk_aio_write_entry, 0, cb, opaque); } +BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, + QEMUIOVector *qiov, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque) +{ + return blk_aio_prwv(blk, offset, qiov->size, qiov, + blk_aio_write_entry, flags, cb, opaque); +} + BlockAIOCB *blk_aio_flush(BlockBackend *blk, BlockCompletionFunc *cb, void *opaque) { diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index 851376b..73df1a6 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -1,7 +1,7 @@ /* * QEMU Block backends * - * Copyright (C) 2014 Red Hat, Inc. + * Copyright (C) 2014-2016 Red Hat, Inc. * * Authors: * Markus Armbruster , @@ -110,9 +110,15 @@ int64_t blk_nb_sectors(BlockBackend *blk); BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num, QEMUIOVector *iov, int nb_sectors, BlockCompletionFunc *cb, void *opaque); +BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, + QEMUIOVector *qiov, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque); BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num, QEMUIOVector *iov, int nb_sectors, BlockCompletionFunc *cb, void *opaque); +BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, + QEMUIOVector *qiov, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque); BlockAIOCB *blk_aio_flush(BlockBackend *blk, BlockCompletionFunc *cb, void *opaque); BlockAIOCB *blk_aio_discard(BlockBackend *blk,