From patchwork Thu May 26 06:12:18 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amit Shah X-Patchwork-Id: 626580 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 3rFfZH6dBsz9s9G for ; Thu, 26 May 2016 16:36:55 +1000 (AEST) Received: from localhost ([::1]:36674 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b5oub-0002kU-LI for incoming@patchwork.ozlabs.org; Thu, 26 May 2016 02:36:53 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36082) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b5oYD-00063h-Pb for qemu-devel@nongnu.org; Thu, 26 May 2016 02:13:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b5oY8-00006x-1m for qemu-devel@nongnu.org; Thu, 26 May 2016 02:13:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58565) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b5oY7-00006c-PU for qemu-devel@nongnu.org; Thu, 26 May 2016 02:13:39 -0400 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (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 731AF3B751; Thu, 26 May 2016 06:13:39 +0000 (UTC) Received: from localhost (ovpn-116-25.sin2.redhat.com [10.67.116.25]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u4Q6Db3X010945; Thu, 26 May 2016 02:13:38 -0400 From: Amit Shah To: Peter Maydell Date: Thu, 26 May 2016 11:42:18 +0530 Message-Id: <11808bb0c422134bf09119f4aa22c59b0ce84bf3.1464242913.git.amit.shah@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Thu, 26 May 2016 06:13:39 +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 27/28] migration: remove support for non-iovec based write handlers 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: qemu list , Amit Shah , "Dr. David Alan Gilbert" , Juan Quintela Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: "Daniel P. Berrange" All the remaining QEMUFile implementations provide an iovec based write handler, so the put_buffer callback can be removed to simplify the code. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Daniel P. Berrange Message-Id: <1461751518-12128-28-git-send-email-berrange@redhat.com> Signed-off-by: Amit Shah --- include/migration/qemu-file.h | 9 --------- migration/qemu-file.c | 36 ++++++++---------------------------- migration/savevm.c | 8 -------- 3 files changed, 8 insertions(+), 45 deletions(-) diff --git a/include/migration/qemu-file.h b/include/migration/qemu-file.h index 43eba9b..36af5f4 100644 --- a/include/migration/qemu-file.h +++ b/include/migration/qemu-file.h @@ -28,14 +28,6 @@ #include "io/channel.h" -/* This function writes a chunk of data to a file at the given position. - * The pos argument can be ignored if the file is only being used for - * streaming. The handler must write all of the data or return a negative - * errno value. - */ -typedef ssize_t (QEMUFilePutBufferFunc)(void *opaque, const uint8_t *buf, - int64_t pos, size_t size); - /* Read a chunk of data from a file at the given position. The pos argument * can be ignored if the file is only be used for streaming. The number of * bytes actually read should be returned. @@ -109,7 +101,6 @@ typedef QEMUFile *(QEMURetPathFunc)(void *opaque); typedef int (QEMUFileShutdownFunc)(void *opaque, bool rd, bool wr); typedef struct QEMUFileOps { - QEMUFilePutBufferFunc *put_buffer; QEMUFileGetBufferFunc *get_buffer; QEMUFileCloseFunc *close; QEMUFileGetFD *get_fd; diff --git a/migration/qemu-file.c b/migration/qemu-file.c index cf743d1..6790040 100644 --- a/migration/qemu-file.c +++ b/migration/qemu-file.c @@ -129,7 +129,7 @@ void qemu_file_set_error(QEMUFile *f, int ret) bool qemu_file_is_writable(QEMUFile *f) { - return f->ops->writev_buffer || f->ops->put_buffer; + return f->ops->writev_buffer; } /** @@ -148,16 +148,9 @@ void qemu_fflush(QEMUFile *f) return; } - if (f->ops->writev_buffer) { - if (f->iovcnt > 0) { - expect = iov_size(f->iov, f->iovcnt); - ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos); - } - } else { - if (f->buf_index > 0) { - expect = f->buf_index; - ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index); - } + if (f->iovcnt > 0) { + expect = iov_size(f->iov, f->iovcnt); + ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos); } if (ret >= 0) { @@ -337,11 +330,6 @@ static void add_to_iovec(QEMUFile *f, const uint8_t *buf, size_t size) void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, size_t size) { - if (!f->ops->writev_buffer) { - qemu_put_buffer(f, buf, size); - return; - } - if (f->last_error) { return; } @@ -365,9 +353,7 @@ void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, size_t size) } memcpy(f->buf + f->buf_index, buf, l); f->bytes_xfer += l; - if (f->ops->writev_buffer) { - add_to_iovec(f, f->buf + f->buf_index, l); - } + add_to_iovec(f, f->buf + f->buf_index, l); f->buf_index += l; if (f->buf_index == IO_BUF_SIZE) { qemu_fflush(f); @@ -388,9 +374,7 @@ void qemu_put_byte(QEMUFile *f, int v) f->buf[f->buf_index] = v; f->bytes_xfer++; - if (f->ops->writev_buffer) { - add_to_iovec(f, f->buf + f->buf_index, 1); - } + add_to_iovec(f, f->buf + f->buf_index, 1); f->buf_index++; if (f->buf_index == IO_BUF_SIZE) { qemu_fflush(f); @@ -554,12 +538,8 @@ int64_t qemu_ftell_fast(QEMUFile *f) int64_t ret = f->pos; int i; - if (f->ops->writev_buffer) { - for (i = 0; i < f->iovcnt; i++) { - ret += f->iov[i].iov_len; - } - } else { - ret += f->buf_index; + for (i = 0; i < f->iovcnt; i++) { + ret += f->iov[i].iov_len; } return ret; diff --git a/migration/savevm.c b/migration/savevm.c index 2bd3452..6c21231 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -160,13 +160,6 @@ static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt, return qiov.size; } -static ssize_t block_put_buffer(void *opaque, const uint8_t *buf, - int64_t pos, size_t size) -{ - bdrv_save_vmstate(opaque, buf, pos, size); - return size; -} - static ssize_t block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, size_t size) { @@ -184,7 +177,6 @@ static const QEMUFileOps bdrv_read_ops = { }; static const QEMUFileOps bdrv_write_ops = { - .put_buffer = block_put_buffer, .writev_buffer = block_writev_buffer, .close = bdrv_fclose };