From patchwork Thu Apr 28 13:16:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 8970471 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 4DCF9BF29F for ; Thu, 28 Apr 2016 13:24:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A692E2015A for ; Thu, 28 Apr 2016 13:24:49 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D7EF0200F2 for ; Thu, 28 Apr 2016 13:24:48 +0000 (UTC) Received: from localhost ([::1]:49088 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1avlvz-0005VJ-ST for patchwork-qemu-devel@patchwork.kernel.org; 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Thu, 28 Apr 2016 09:17:04 -0400 From: Kevin Wolf To: qemu-block@nongnu.org Date: Thu, 28 Apr 2016 15:16:36 +0200 Message-Id: <1461849406-29743-8-git-send-email-kwolf@redhat.com> In-Reply-To: <1461849406-29743-1-git-send-email-kwolf@redhat.com> References: <1461849406-29743-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 28 Apr 2016 13:17:06 +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] [PATCH v2 07/17] cloop: Implement .bdrv_co_preadv() interface 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, famz@redhat.com, sw@weilnetz.de, qemu-devel@nongnu.org, mreitz@redhat.com, stefanha@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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 Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake --- block/cloop.c | 38 ++++++++++++++++++++++---------------- 1 file changed, 22 insertions(+), 16 deletions(-) diff --git a/block/cloop.c b/block/cloop.c index a84f140..fc1ca3a 100644 --- a/block/cloop.c +++ b/block/cloop.c @@ -66,6 +66,7 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags, int ret; bs->read_only = 1; + bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */ /* read header */ ret = bdrv_pread(bs->file->bs, 128, &s->block_size, 4); @@ -229,33 +230,38 @@ static inline int cloop_read_block(BlockDriverState *bs, int block_num) return 0; } -static int cloop_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) +static int coroutine_fn +cloop_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, + QEMUIOVector *qiov, int flags) { BDRVCloopState *s = bs->opaque; - int i; + uint64_t sector_num = offset >> BDRV_SECTOR_BITS; + int nb_sectors = bytes >> BDRV_SECTOR_BITS; + int ret, i; + + assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); + assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); + + qemu_co_mutex_lock(&s->lock); for (i = 0; i < nb_sectors; i++) { + void *data; uint32_t sector_offset_in_block = ((sector_num + i) % s->sectors_per_block), block_num = (sector_num + i) / s->sectors_per_block; if (cloop_read_block(bs, block_num) != 0) { - return -1; + ret = -EIO; + goto fail; } - memcpy(buf + i * 512, - s->uncompressed_block + sector_offset_in_block * 512, 512); + + data = s->uncompressed_block + sector_offset_in_block * 512; + qemu_iovec_from_buf(qiov, i * 512, data, 512); } - return 0; -} -static coroutine_fn int cloop_co_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) -{ - int ret; - BDRVCloopState *s = bs->opaque; - qemu_co_mutex_lock(&s->lock); - ret = cloop_read(bs, sector_num, buf, nb_sectors); + ret = 0; +fail: qemu_co_mutex_unlock(&s->lock); + return ret; } @@ -273,7 +279,7 @@ static BlockDriver bdrv_cloop = { .instance_size = sizeof(BDRVCloopState), .bdrv_probe = cloop_probe, .bdrv_open = cloop_open, - .bdrv_read = cloop_co_read, + .bdrv_co_preadv = cloop_co_preadv, .bdrv_close = cloop_close, };